Commit | Line | Data |
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b43d65f7 | 1 | /* |
b43d65f7 LW |
2 | * A driver for the ARM PL022 PrimeCell SSP/SPI bus master. |
3 | * | |
4 | * Copyright (C) 2008-2009 ST-Ericsson AB | |
5 | * Copyright (C) 2006 STMicroelectronics Pvt. Ltd. | |
6 | * | |
7 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
8 | * | |
9 | * Initial version inspired by: | |
10 | * linux-2.6.17-rc3-mm1/drivers/spi/pxa2xx_spi.c | |
11 | * Initial adoption to PL022 by: | |
12 | * Sachin Verma <sachin.verma@st.com> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | */ | |
24 | ||
b43d65f7 LW |
25 | #include <linux/init.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/ioport.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/spi/spi.h> | |
b43d65f7 LW |
32 | #include <linux/delay.h> |
33 | #include <linux/clk.h> | |
34 | #include <linux/err.h> | |
35 | #include <linux/amba/bus.h> | |
36 | #include <linux/amba/pl022.h> | |
37 | #include <linux/io.h> | |
5a0e3ad6 | 38 | #include <linux/slab.h> |
b1b6b9aa LW |
39 | #include <linux/dmaengine.h> |
40 | #include <linux/dma-mapping.h> | |
41 | #include <linux/scatterlist.h> | |
bcda6ff8 | 42 | #include <linux/pm_runtime.h> |
b43d65f7 LW |
43 | |
44 | /* | |
45 | * This macro is used to define some register default values. | |
46 | * reg is masked with mask, the OR:ed with an (again masked) | |
47 | * val shifted sb steps to the left. | |
48 | */ | |
49 | #define SSP_WRITE_BITS(reg, val, mask, sb) \ | |
50 | ((reg) = (((reg) & ~(mask)) | (((val)<<(sb)) & (mask)))) | |
51 | ||
52 | /* | |
53 | * This macro is also used to define some default values. | |
54 | * It will just shift val by sb steps to the left and mask | |
55 | * the result with mask. | |
56 | */ | |
57 | #define GEN_MASK_BITS(val, mask, sb) \ | |
58 | (((val)<<(sb)) & (mask)) | |
59 | ||
60 | #define DRIVE_TX 0 | |
61 | #define DO_NOT_DRIVE_TX 1 | |
62 | ||
63 | #define DO_NOT_QUEUE_DMA 0 | |
64 | #define QUEUE_DMA 1 | |
65 | ||
66 | #define RX_TRANSFER 1 | |
67 | #define TX_TRANSFER 2 | |
68 | ||
69 | /* | |
70 | * Macros to access SSP Registers with their offsets | |
71 | */ | |
72 | #define SSP_CR0(r) (r + 0x000) | |
73 | #define SSP_CR1(r) (r + 0x004) | |
74 | #define SSP_DR(r) (r + 0x008) | |
75 | #define SSP_SR(r) (r + 0x00C) | |
76 | #define SSP_CPSR(r) (r + 0x010) | |
77 | #define SSP_IMSC(r) (r + 0x014) | |
78 | #define SSP_RIS(r) (r + 0x018) | |
79 | #define SSP_MIS(r) (r + 0x01C) | |
80 | #define SSP_ICR(r) (r + 0x020) | |
81 | #define SSP_DMACR(r) (r + 0x024) | |
82 | #define SSP_ITCR(r) (r + 0x080) | |
83 | #define SSP_ITIP(r) (r + 0x084) | |
84 | #define SSP_ITOP(r) (r + 0x088) | |
85 | #define SSP_TDR(r) (r + 0x08C) | |
86 | ||
87 | #define SSP_PID0(r) (r + 0xFE0) | |
88 | #define SSP_PID1(r) (r + 0xFE4) | |
89 | #define SSP_PID2(r) (r + 0xFE8) | |
90 | #define SSP_PID3(r) (r + 0xFEC) | |
91 | ||
92 | #define SSP_CID0(r) (r + 0xFF0) | |
93 | #define SSP_CID1(r) (r + 0xFF4) | |
94 | #define SSP_CID2(r) (r + 0xFF8) | |
95 | #define SSP_CID3(r) (r + 0xFFC) | |
96 | ||
97 | /* | |
98 | * SSP Control Register 0 - SSP_CR0 | |
99 | */ | |
556f4aeb LW |
100 | #define SSP_CR0_MASK_DSS (0x0FUL << 0) |
101 | #define SSP_CR0_MASK_FRF (0x3UL << 4) | |
b43d65f7 LW |
102 | #define SSP_CR0_MASK_SPO (0x1UL << 6) |
103 | #define SSP_CR0_MASK_SPH (0x1UL << 7) | |
104 | #define SSP_CR0_MASK_SCR (0xFFUL << 8) | |
556f4aeb LW |
105 | |
106 | /* | |
107 | * The ST version of this block moves som bits | |
108 | * in SSP_CR0 and extends it to 32 bits | |
109 | */ | |
110 | #define SSP_CR0_MASK_DSS_ST (0x1FUL << 0) | |
111 | #define SSP_CR0_MASK_HALFDUP_ST (0x1UL << 5) | |
112 | #define SSP_CR0_MASK_CSS_ST (0x1FUL << 16) | |
113 | #define SSP_CR0_MASK_FRF_ST (0x3UL << 21) | |
114 | ||
b43d65f7 LW |
115 | /* |
116 | * SSP Control Register 0 - SSP_CR1 | |
117 | */ | |
118 | #define SSP_CR1_MASK_LBM (0x1UL << 0) | |
119 | #define SSP_CR1_MASK_SSE (0x1UL << 1) | |
120 | #define SSP_CR1_MASK_MS (0x1UL << 2) | |
121 | #define SSP_CR1_MASK_SOD (0x1UL << 3) | |
b43d65f7 LW |
122 | |
123 | /* | |
556f4aeb LW |
124 | * The ST version of this block adds some bits |
125 | * in SSP_CR1 | |
b43d65f7 | 126 | */ |
556f4aeb LW |
127 | #define SSP_CR1_MASK_RENDN_ST (0x1UL << 4) |
128 | #define SSP_CR1_MASK_TENDN_ST (0x1UL << 5) | |
129 | #define SSP_CR1_MASK_MWAIT_ST (0x1UL << 6) | |
130 | #define SSP_CR1_MASK_RXIFLSEL_ST (0x7UL << 7) | |
131 | #define SSP_CR1_MASK_TXIFLSEL_ST (0x7UL << 10) | |
781c7b12 LW |
132 | /* This one is only in the PL023 variant */ |
133 | #define SSP_CR1_MASK_FBCLKDEL_ST (0x7UL << 13) | |
b43d65f7 LW |
134 | |
135 | /* | |
136 | * SSP Status Register - SSP_SR | |
137 | */ | |
138 | #define SSP_SR_MASK_TFE (0x1UL << 0) /* Transmit FIFO empty */ | |
139 | #define SSP_SR_MASK_TNF (0x1UL << 1) /* Transmit FIFO not full */ | |
140 | #define SSP_SR_MASK_RNE (0x1UL << 2) /* Receive FIFO not empty */ | |
556f4aeb | 141 | #define SSP_SR_MASK_RFF (0x1UL << 3) /* Receive FIFO full */ |
b43d65f7 LW |
142 | #define SSP_SR_MASK_BSY (0x1UL << 4) /* Busy Flag */ |
143 | ||
144 | /* | |
145 | * SSP Clock Prescale Register - SSP_CPSR | |
146 | */ | |
147 | #define SSP_CPSR_MASK_CPSDVSR (0xFFUL << 0) | |
148 | ||
149 | /* | |
150 | * SSP Interrupt Mask Set/Clear Register - SSP_IMSC | |
151 | */ | |
152 | #define SSP_IMSC_MASK_RORIM (0x1UL << 0) /* Receive Overrun Interrupt mask */ | |
153 | #define SSP_IMSC_MASK_RTIM (0x1UL << 1) /* Receive timeout Interrupt mask */ | |
154 | #define SSP_IMSC_MASK_RXIM (0x1UL << 2) /* Receive FIFO Interrupt mask */ | |
155 | #define SSP_IMSC_MASK_TXIM (0x1UL << 3) /* Transmit FIFO Interrupt mask */ | |
156 | ||
157 | /* | |
158 | * SSP Raw Interrupt Status Register - SSP_RIS | |
159 | */ | |
160 | /* Receive Overrun Raw Interrupt status */ | |
161 | #define SSP_RIS_MASK_RORRIS (0x1UL << 0) | |
162 | /* Receive Timeout Raw Interrupt status */ | |
163 | #define SSP_RIS_MASK_RTRIS (0x1UL << 1) | |
164 | /* Receive FIFO Raw Interrupt status */ | |
165 | #define SSP_RIS_MASK_RXRIS (0x1UL << 2) | |
166 | /* Transmit FIFO Raw Interrupt status */ | |
167 | #define SSP_RIS_MASK_TXRIS (0x1UL << 3) | |
168 | ||
169 | /* | |
170 | * SSP Masked Interrupt Status Register - SSP_MIS | |
171 | */ | |
172 | /* Receive Overrun Masked Interrupt status */ | |
173 | #define SSP_MIS_MASK_RORMIS (0x1UL << 0) | |
174 | /* Receive Timeout Masked Interrupt status */ | |
175 | #define SSP_MIS_MASK_RTMIS (0x1UL << 1) | |
176 | /* Receive FIFO Masked Interrupt status */ | |
177 | #define SSP_MIS_MASK_RXMIS (0x1UL << 2) | |
178 | /* Transmit FIFO Masked Interrupt status */ | |
179 | #define SSP_MIS_MASK_TXMIS (0x1UL << 3) | |
180 | ||
181 | /* | |
182 | * SSP Interrupt Clear Register - SSP_ICR | |
183 | */ | |
184 | /* Receive Overrun Raw Clear Interrupt bit */ | |
185 | #define SSP_ICR_MASK_RORIC (0x1UL << 0) | |
186 | /* Receive Timeout Clear Interrupt bit */ | |
187 | #define SSP_ICR_MASK_RTIC (0x1UL << 1) | |
188 | ||
189 | /* | |
190 | * SSP DMA Control Register - SSP_DMACR | |
191 | */ | |
192 | /* Receive DMA Enable bit */ | |
193 | #define SSP_DMACR_MASK_RXDMAE (0x1UL << 0) | |
194 | /* Transmit DMA Enable bit */ | |
195 | #define SSP_DMACR_MASK_TXDMAE (0x1UL << 1) | |
196 | ||
197 | /* | |
198 | * SSP Integration Test control Register - SSP_ITCR | |
199 | */ | |
200 | #define SSP_ITCR_MASK_ITEN (0x1UL << 0) | |
201 | #define SSP_ITCR_MASK_TESTFIFO (0x1UL << 1) | |
202 | ||
203 | /* | |
204 | * SSP Integration Test Input Register - SSP_ITIP | |
205 | */ | |
206 | #define ITIP_MASK_SSPRXD (0x1UL << 0) | |
207 | #define ITIP_MASK_SSPFSSIN (0x1UL << 1) | |
208 | #define ITIP_MASK_SSPCLKIN (0x1UL << 2) | |
209 | #define ITIP_MASK_RXDMAC (0x1UL << 3) | |
210 | #define ITIP_MASK_TXDMAC (0x1UL << 4) | |
211 | #define ITIP_MASK_SSPTXDIN (0x1UL << 5) | |
212 | ||
213 | /* | |
214 | * SSP Integration Test output Register - SSP_ITOP | |
215 | */ | |
216 | #define ITOP_MASK_SSPTXD (0x1UL << 0) | |
217 | #define ITOP_MASK_SSPFSSOUT (0x1UL << 1) | |
218 | #define ITOP_MASK_SSPCLKOUT (0x1UL << 2) | |
219 | #define ITOP_MASK_SSPOEn (0x1UL << 3) | |
220 | #define ITOP_MASK_SSPCTLOEn (0x1UL << 4) | |
221 | #define ITOP_MASK_RORINTR (0x1UL << 5) | |
222 | #define ITOP_MASK_RTINTR (0x1UL << 6) | |
223 | #define ITOP_MASK_RXINTR (0x1UL << 7) | |
224 | #define ITOP_MASK_TXINTR (0x1UL << 8) | |
225 | #define ITOP_MASK_INTR (0x1UL << 9) | |
226 | #define ITOP_MASK_RXDMABREQ (0x1UL << 10) | |
227 | #define ITOP_MASK_RXDMASREQ (0x1UL << 11) | |
228 | #define ITOP_MASK_TXDMABREQ (0x1UL << 12) | |
229 | #define ITOP_MASK_TXDMASREQ (0x1UL << 13) | |
230 | ||
231 | /* | |
232 | * SSP Test Data Register - SSP_TDR | |
233 | */ | |
556f4aeb | 234 | #define TDR_MASK_TESTDATA (0xFFFFFFFF) |
b43d65f7 LW |
235 | |
236 | /* | |
237 | * Message State | |
238 | * we use the spi_message.state (void *) pointer to | |
239 | * hold a single state value, that's why all this | |
240 | * (void *) casting is done here. | |
241 | */ | |
556f4aeb LW |
242 | #define STATE_START ((void *) 0) |
243 | #define STATE_RUNNING ((void *) 1) | |
244 | #define STATE_DONE ((void *) 2) | |
245 | #define STATE_ERROR ((void *) -1) | |
b43d65f7 | 246 | |
b43d65f7 LW |
247 | /* |
248 | * SSP State - Whether Enabled or Disabled | |
249 | */ | |
556f4aeb LW |
250 | #define SSP_DISABLED (0) |
251 | #define SSP_ENABLED (1) | |
b43d65f7 LW |
252 | |
253 | /* | |
254 | * SSP DMA State - Whether DMA Enabled or Disabled | |
255 | */ | |
556f4aeb LW |
256 | #define SSP_DMA_DISABLED (0) |
257 | #define SSP_DMA_ENABLED (1) | |
b43d65f7 LW |
258 | |
259 | /* | |
260 | * SSP Clock Defaults | |
261 | */ | |
556f4aeb LW |
262 | #define SSP_DEFAULT_CLKRATE 0x2 |
263 | #define SSP_DEFAULT_PRESCALE 0x40 | |
b43d65f7 LW |
264 | |
265 | /* | |
266 | * SSP Clock Parameter ranges | |
267 | */ | |
268 | #define CPSDVR_MIN 0x02 | |
269 | #define CPSDVR_MAX 0xFE | |
270 | #define SCR_MIN 0x00 | |
271 | #define SCR_MAX 0xFF | |
272 | ||
273 | /* | |
274 | * SSP Interrupt related Macros | |
275 | */ | |
276 | #define DEFAULT_SSP_REG_IMSC 0x0UL | |
277 | #define DISABLE_ALL_INTERRUPTS DEFAULT_SSP_REG_IMSC | |
278 | #define ENABLE_ALL_INTERRUPTS (~DEFAULT_SSP_REG_IMSC) | |
279 | ||
280 | #define CLEAR_ALL_INTERRUPTS 0x3 | |
281 | ||
a18c266f MT |
282 | #define SPI_POLLING_TIMEOUT 1000 |
283 | ||
b43d65f7 LW |
284 | /* |
285 | * The type of reading going on on this chip | |
286 | */ | |
287 | enum ssp_reading { | |
288 | READING_NULL, | |
289 | READING_U8, | |
290 | READING_U16, | |
291 | READING_U32 | |
292 | }; | |
293 | ||
294 | /** | |
295 | * The type of writing going on on this chip | |
296 | */ | |
297 | enum ssp_writing { | |
298 | WRITING_NULL, | |
299 | WRITING_U8, | |
300 | WRITING_U16, | |
301 | WRITING_U32 | |
302 | }; | |
303 | ||
304 | /** | |
305 | * struct vendor_data - vendor-specific config parameters | |
306 | * for PL022 derivates | |
307 | * @fifodepth: depth of FIFOs (both) | |
308 | * @max_bpw: maximum number of bits per word | |
309 | * @unidir: supports unidirection transfers | |
556f4aeb LW |
310 | * @extended_cr: 32 bit wide control register 0 with extra |
311 | * features and extra features in CR1 as found in the ST variants | |
781c7b12 | 312 | * @pl023: supports a subset of the ST extensions called "PL023" |
b43d65f7 LW |
313 | */ |
314 | struct vendor_data { | |
315 | int fifodepth; | |
316 | int max_bpw; | |
317 | bool unidir; | |
556f4aeb | 318 | bool extended_cr; |
781c7b12 | 319 | bool pl023; |
06fb01fd | 320 | bool loopback; |
b43d65f7 LW |
321 | }; |
322 | ||
323 | /** | |
324 | * struct pl022 - This is the private SSP driver data structure | |
325 | * @adev: AMBA device model hookup | |
12e8b325 LW |
326 | * @vendor: vendor data for the IP block |
327 | * @phybase: the physical memory where the SSP device resides | |
328 | * @virtbase: the virtual memory where the SSP is mapped | |
329 | * @clk: outgoing clock "SPICLK" for the SPI bus | |
b43d65f7 LW |
330 | * @master: SPI framework hookup |
331 | * @master_info: controller-specific data from machine setup | |
14af60b6 CB |
332 | * @kworker: thread struct for message pump |
333 | * @kworker_task: pointer to task for message pump kworker thread | |
334 | * @pump_messages: work struct for scheduling work to the message pump | |
12e8b325 LW |
335 | * @queue_lock: spinlock to syncronise access to message queue |
336 | * @queue: message queue | |
14af60b6 CB |
337 | * @busy: message pump is busy |
338 | * @running: message pump is running | |
b43d65f7 LW |
339 | * @pump_transfers: Tasklet used in Interrupt Transfer mode |
340 | * @cur_msg: Pointer to current spi_message being processed | |
341 | * @cur_transfer: Pointer to current spi_transfer | |
342 | * @cur_chip: pointer to current clients chip(assigned from controller_state) | |
8b8d7191 VS |
343 | * @next_msg_cs_active: the next message in the queue has been examined |
344 | * and it was found that it uses the same chip select as the previous | |
345 | * message, so we left it active after the previous transfer, and it's | |
346 | * active already. | |
b43d65f7 LW |
347 | * @tx: current position in TX buffer to be read |
348 | * @tx_end: end position in TX buffer to be read | |
349 | * @rx: current position in RX buffer to be written | |
350 | * @rx_end: end position in RX buffer to be written | |
12e8b325 LW |
351 | * @read: the type of read currently going on |
352 | * @write: the type of write currently going on | |
353 | * @exp_fifo_level: expected FIFO level | |
354 | * @dma_rx_channel: optional channel for RX DMA | |
355 | * @dma_tx_channel: optional channel for TX DMA | |
356 | * @sgt_rx: scattertable for the RX transfer | |
357 | * @sgt_tx: scattertable for the TX transfer | |
358 | * @dummypage: a dummy page used for driving data on the bus with DMA | |
b43d65f7 LW |
359 | */ |
360 | struct pl022 { | |
361 | struct amba_device *adev; | |
362 | struct vendor_data *vendor; | |
363 | resource_size_t phybase; | |
364 | void __iomem *virtbase; | |
365 | struct clk *clk; | |
366 | struct spi_master *master; | |
367 | struct pl022_ssp_controller *master_info; | |
ffbbdd21 | 368 | /* Message per-transfer pump */ |
b43d65f7 LW |
369 | struct tasklet_struct pump_transfers; |
370 | struct spi_message *cur_msg; | |
371 | struct spi_transfer *cur_transfer; | |
372 | struct chip_data *cur_chip; | |
8b8d7191 | 373 | bool next_msg_cs_active; |
b43d65f7 LW |
374 | void *tx; |
375 | void *tx_end; | |
376 | void *rx; | |
377 | void *rx_end; | |
378 | enum ssp_reading read; | |
379 | enum ssp_writing write; | |
fc05475f | 380 | u32 exp_fifo_level; |
083be3f0 LW |
381 | enum ssp_rx_level_trig rx_lev_trig; |
382 | enum ssp_tx_level_trig tx_lev_trig; | |
b1b6b9aa LW |
383 | /* DMA settings */ |
384 | #ifdef CONFIG_DMA_ENGINE | |
385 | struct dma_chan *dma_rx_channel; | |
386 | struct dma_chan *dma_tx_channel; | |
387 | struct sg_table sgt_rx; | |
388 | struct sg_table sgt_tx; | |
389 | char *dummypage; | |
ffbbdd21 | 390 | bool dma_running; |
b1b6b9aa | 391 | #endif |
b43d65f7 LW |
392 | }; |
393 | ||
394 | /** | |
395 | * struct chip_data - To maintain runtime state of SSP for each client chip | |
556f4aeb LW |
396 | * @cr0: Value of control register CR0 of SSP - on later ST variants this |
397 | * register is 32 bits wide rather than just 16 | |
b43d65f7 LW |
398 | * @cr1: Value of control register CR1 of SSP |
399 | * @dmacr: Value of DMA control Register of SSP | |
400 | * @cpsr: Value of Clock prescale register | |
401 | * @n_bytes: how many bytes(power of 2) reqd for a given data width of client | |
402 | * @enable_dma: Whether to enable DMA or not | |
b43d65f7 | 403 | * @read: function ptr to be used to read when doing xfer for this chip |
12e8b325 | 404 | * @write: function ptr to be used to write when doing xfer for this chip |
b43d65f7 LW |
405 | * @cs_control: chip select callback provided by chip |
406 | * @xfer_type: polling/interrupt/DMA | |
407 | * | |
408 | * Runtime state of the SSP controller, maintained per chip, | |
409 | * This would be set according to the current message that would be served | |
410 | */ | |
411 | struct chip_data { | |
556f4aeb | 412 | u32 cr0; |
b43d65f7 LW |
413 | u16 cr1; |
414 | u16 dmacr; | |
415 | u16 cpsr; | |
416 | u8 n_bytes; | |
b1b6b9aa | 417 | bool enable_dma; |
b43d65f7 LW |
418 | enum ssp_reading read; |
419 | enum ssp_writing write; | |
420 | void (*cs_control) (u32 command); | |
421 | int xfer_type; | |
422 | }; | |
423 | ||
424 | /** | |
425 | * null_cs_control - Dummy chip select function | |
426 | * @command: select/delect the chip | |
427 | * | |
428 | * If no chip select function is provided by client this is used as dummy | |
429 | * chip select | |
430 | */ | |
431 | static void null_cs_control(u32 command) | |
432 | { | |
433 | pr_debug("pl022: dummy chip select control, CS=0x%x\n", command); | |
434 | } | |
435 | ||
436 | /** | |
437 | * giveback - current spi_message is over, schedule next message and call | |
438 | * callback of this message. Assumes that caller already | |
439 | * set message->status; dma and pio irqs are blocked | |
440 | * @pl022: SSP driver private data structure | |
441 | */ | |
442 | static void giveback(struct pl022 *pl022) | |
443 | { | |
444 | struct spi_transfer *last_transfer; | |
8b8d7191 | 445 | pl022->next_msg_cs_active = false; |
b43d65f7 | 446 | |
8b8d7191 | 447 | last_transfer = list_entry(pl022->cur_msg->transfers.prev, |
b43d65f7 LW |
448 | struct spi_transfer, |
449 | transfer_list); | |
450 | ||
451 | /* Delay if requested before any change in chip select */ | |
452 | if (last_transfer->delay_usecs) | |
453 | /* | |
454 | * FIXME: This runs in interrupt context. | |
455 | * Is this really smart? | |
456 | */ | |
457 | udelay(last_transfer->delay_usecs); | |
458 | ||
8b8d7191 | 459 | if (!last_transfer->cs_change) { |
b43d65f7 LW |
460 | struct spi_message *next_msg; |
461 | ||
8b8d7191 VS |
462 | /* |
463 | * cs_change was not set. We can keep the chip select | |
464 | * enabled if there is message in the queue and it is | |
465 | * for the same spi device. | |
b43d65f7 LW |
466 | * |
467 | * We cannot postpone this until pump_messages, because | |
468 | * after calling msg->complete (below) the driver that | |
469 | * sent the current message could be unloaded, which | |
470 | * could invalidate the cs_control() callback... | |
471 | */ | |
b43d65f7 | 472 | /* get a pointer to the next message, if any */ |
ffbbdd21 | 473 | next_msg = spi_get_next_queued_message(pl022->master); |
b43d65f7 | 474 | |
8b8d7191 VS |
475 | /* |
476 | * see if the next and current messages point | |
477 | * to the same spi device. | |
b43d65f7 | 478 | */ |
8b8d7191 | 479 | if (next_msg && next_msg->spi != pl022->cur_msg->spi) |
b43d65f7 | 480 | next_msg = NULL; |
8b8d7191 VS |
481 | if (!next_msg || pl022->cur_msg->state == STATE_ERROR) |
482 | pl022->cur_chip->cs_control(SSP_CHIP_DESELECT); | |
483 | else | |
484 | pl022->next_msg_cs_active = true; | |
ffbbdd21 | 485 | |
b43d65f7 | 486 | } |
8b8d7191 | 487 | |
8b8d7191 VS |
488 | pl022->cur_msg = NULL; |
489 | pl022->cur_transfer = NULL; | |
490 | pl022->cur_chip = NULL; | |
ffbbdd21 | 491 | spi_finalize_current_message(pl022->master); |
b43d65f7 LW |
492 | } |
493 | ||
494 | /** | |
495 | * flush - flush the FIFO to reach a clean state | |
496 | * @pl022: SSP driver private data structure | |
497 | */ | |
498 | static int flush(struct pl022 *pl022) | |
499 | { | |
500 | unsigned long limit = loops_per_jiffy << 1; | |
501 | ||
502 | dev_dbg(&pl022->adev->dev, "flush\n"); | |
503 | do { | |
504 | while (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) | |
505 | readw(SSP_DR(pl022->virtbase)); | |
506 | } while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_BSY) && limit--); | |
fc05475f LW |
507 | |
508 | pl022->exp_fifo_level = 0; | |
509 | ||
b43d65f7 LW |
510 | return limit; |
511 | } | |
512 | ||
513 | /** | |
514 | * restore_state - Load configuration of current chip | |
515 | * @pl022: SSP driver private data structure | |
516 | */ | |
517 | static void restore_state(struct pl022 *pl022) | |
518 | { | |
519 | struct chip_data *chip = pl022->cur_chip; | |
520 | ||
556f4aeb LW |
521 | if (pl022->vendor->extended_cr) |
522 | writel(chip->cr0, SSP_CR0(pl022->virtbase)); | |
523 | else | |
524 | writew(chip->cr0, SSP_CR0(pl022->virtbase)); | |
b43d65f7 LW |
525 | writew(chip->cr1, SSP_CR1(pl022->virtbase)); |
526 | writew(chip->dmacr, SSP_DMACR(pl022->virtbase)); | |
527 | writew(chip->cpsr, SSP_CPSR(pl022->virtbase)); | |
528 | writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase)); | |
529 | writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); | |
530 | } | |
531 | ||
b43d65f7 LW |
532 | /* |
533 | * Default SSP Register Values | |
534 | */ | |
535 | #define DEFAULT_SSP_REG_CR0 ( \ | |
536 | GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS, 0) | \ | |
556f4aeb LW |
537 | GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF, 4) | \ |
538 | GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ | |
539 | GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ | |
540 | GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \ | |
541 | ) | |
542 | ||
543 | /* ST versions have slightly different bit layout */ | |
544 | #define DEFAULT_SSP_REG_CR0_ST ( \ | |
545 | GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \ | |
546 | GEN_MASK_BITS(SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, SSP_CR0_MASK_HALFDUP_ST, 5) | \ | |
b43d65f7 | 547 | GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ |
ee2b805c | 548 | GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ |
556f4aeb LW |
549 | GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) | \ |
550 | GEN_MASK_BITS(SSP_BITS_8, SSP_CR0_MASK_CSS_ST, 16) | \ | |
551 | GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF_ST, 21) \ | |
b43d65f7 LW |
552 | ) |
553 | ||
781c7b12 LW |
554 | /* The PL023 version is slightly different again */ |
555 | #define DEFAULT_SSP_REG_CR0_ST_PL023 ( \ | |
556 | GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \ | |
557 | GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ | |
558 | GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ | |
559 | GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \ | |
560 | ) | |
561 | ||
b43d65f7 LW |
562 | #define DEFAULT_SSP_REG_CR1 ( \ |
563 | GEN_MASK_BITS(LOOPBACK_DISABLED, SSP_CR1_MASK_LBM, 0) | \ | |
564 | GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \ | |
565 | GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \ | |
556f4aeb | 566 | GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) \ |
b43d65f7 LW |
567 | ) |
568 | ||
556f4aeb LW |
569 | /* ST versions extend this register to use all 16 bits */ |
570 | #define DEFAULT_SSP_REG_CR1_ST ( \ | |
571 | DEFAULT_SSP_REG_CR1 | \ | |
572 | GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \ | |
573 | GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \ | |
574 | GEN_MASK_BITS(SSP_MWIRE_WAIT_ZERO, SSP_CR1_MASK_MWAIT_ST, 6) |\ | |
575 | GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \ | |
576 | GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) \ | |
577 | ) | |
578 | ||
781c7b12 LW |
579 | /* |
580 | * The PL023 variant has further differences: no loopback mode, no microwire | |
581 | * support, and a new clock feedback delay setting. | |
582 | */ | |
583 | #define DEFAULT_SSP_REG_CR1_ST_PL023 ( \ | |
584 | GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \ | |
585 | GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \ | |
586 | GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) | \ | |
587 | GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \ | |
588 | GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \ | |
589 | GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \ | |
590 | GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) | \ | |
591 | GEN_MASK_BITS(SSP_FEEDBACK_CLK_DELAY_NONE, SSP_CR1_MASK_FBCLKDEL_ST, 13) \ | |
592 | ) | |
556f4aeb | 593 | |
b43d65f7 | 594 | #define DEFAULT_SSP_REG_CPSR ( \ |
556f4aeb | 595 | GEN_MASK_BITS(SSP_DEFAULT_PRESCALE, SSP_CPSR_MASK_CPSDVSR, 0) \ |
b43d65f7 LW |
596 | ) |
597 | ||
598 | #define DEFAULT_SSP_REG_DMACR (\ | |
599 | GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_RXDMAE, 0) | \ | |
600 | GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_TXDMAE, 1) \ | |
601 | ) | |
602 | ||
781c7b12 LW |
603 | /** |
604 | * load_ssp_default_config - Load default configuration for SSP | |
605 | * @pl022: SSP driver private data structure | |
606 | */ | |
b43d65f7 LW |
607 | static void load_ssp_default_config(struct pl022 *pl022) |
608 | { | |
781c7b12 LW |
609 | if (pl022->vendor->pl023) { |
610 | writel(DEFAULT_SSP_REG_CR0_ST_PL023, SSP_CR0(pl022->virtbase)); | |
611 | writew(DEFAULT_SSP_REG_CR1_ST_PL023, SSP_CR1(pl022->virtbase)); | |
612 | } else if (pl022->vendor->extended_cr) { | |
556f4aeb LW |
613 | writel(DEFAULT_SSP_REG_CR0_ST, SSP_CR0(pl022->virtbase)); |
614 | writew(DEFAULT_SSP_REG_CR1_ST, SSP_CR1(pl022->virtbase)); | |
615 | } else { | |
616 | writew(DEFAULT_SSP_REG_CR0, SSP_CR0(pl022->virtbase)); | |
617 | writew(DEFAULT_SSP_REG_CR1, SSP_CR1(pl022->virtbase)); | |
618 | } | |
b43d65f7 LW |
619 | writew(DEFAULT_SSP_REG_DMACR, SSP_DMACR(pl022->virtbase)); |
620 | writew(DEFAULT_SSP_REG_CPSR, SSP_CPSR(pl022->virtbase)); | |
621 | writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase)); | |
622 | writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); | |
623 | } | |
624 | ||
625 | /** | |
626 | * This will write to TX and read from RX according to the parameters | |
627 | * set in pl022. | |
628 | */ | |
629 | static void readwriter(struct pl022 *pl022) | |
630 | { | |
631 | ||
632 | /* | |
25985edc | 633 | * The FIFO depth is different between primecell variants. |
b43d65f7 LW |
634 | * I believe filling in too much in the FIFO might cause |
635 | * errons in 8bit wide transfers on ARM variants (just 8 words | |
636 | * FIFO, means only 8x8 = 64 bits in FIFO) at least. | |
637 | * | |
fc05475f LW |
638 | * To prevent this issue, the TX FIFO is only filled to the |
639 | * unused RX FIFO fill length, regardless of what the TX | |
640 | * FIFO status flag indicates. | |
b43d65f7 LW |
641 | */ |
642 | dev_dbg(&pl022->adev->dev, | |
643 | "%s, rx: %p, rxend: %p, tx: %p, txend: %p\n", | |
644 | __func__, pl022->rx, pl022->rx_end, pl022->tx, pl022->tx_end); | |
645 | ||
646 | /* Read as much as you can */ | |
647 | while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) | |
648 | && (pl022->rx < pl022->rx_end)) { | |
649 | switch (pl022->read) { | |
650 | case READING_NULL: | |
651 | readw(SSP_DR(pl022->virtbase)); | |
652 | break; | |
653 | case READING_U8: | |
654 | *(u8 *) (pl022->rx) = | |
655 | readw(SSP_DR(pl022->virtbase)) & 0xFFU; | |
656 | break; | |
657 | case READING_U16: | |
658 | *(u16 *) (pl022->rx) = | |
659 | (u16) readw(SSP_DR(pl022->virtbase)); | |
660 | break; | |
661 | case READING_U32: | |
662 | *(u32 *) (pl022->rx) = | |
663 | readl(SSP_DR(pl022->virtbase)); | |
664 | break; | |
665 | } | |
666 | pl022->rx += (pl022->cur_chip->n_bytes); | |
fc05475f | 667 | pl022->exp_fifo_level--; |
b43d65f7 LW |
668 | } |
669 | /* | |
fc05475f | 670 | * Write as much as possible up to the RX FIFO size |
b43d65f7 | 671 | */ |
fc05475f | 672 | while ((pl022->exp_fifo_level < pl022->vendor->fifodepth) |
b43d65f7 LW |
673 | && (pl022->tx < pl022->tx_end)) { |
674 | switch (pl022->write) { | |
675 | case WRITING_NULL: | |
676 | writew(0x0, SSP_DR(pl022->virtbase)); | |
677 | break; | |
678 | case WRITING_U8: | |
679 | writew(*(u8 *) (pl022->tx), SSP_DR(pl022->virtbase)); | |
680 | break; | |
681 | case WRITING_U16: | |
682 | writew((*(u16 *) (pl022->tx)), SSP_DR(pl022->virtbase)); | |
683 | break; | |
684 | case WRITING_U32: | |
685 | writel(*(u32 *) (pl022->tx), SSP_DR(pl022->virtbase)); | |
686 | break; | |
687 | } | |
688 | pl022->tx += (pl022->cur_chip->n_bytes); | |
fc05475f | 689 | pl022->exp_fifo_level++; |
b43d65f7 LW |
690 | /* |
691 | * This inner reader takes care of things appearing in the RX | |
692 | * FIFO as we're transmitting. This will happen a lot since the | |
693 | * clock starts running when you put things into the TX FIFO, | |
25985edc | 694 | * and then things are continuously clocked into the RX FIFO. |
b43d65f7 LW |
695 | */ |
696 | while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) | |
697 | && (pl022->rx < pl022->rx_end)) { | |
698 | switch (pl022->read) { | |
699 | case READING_NULL: | |
700 | readw(SSP_DR(pl022->virtbase)); | |
701 | break; | |
702 | case READING_U8: | |
703 | *(u8 *) (pl022->rx) = | |
704 | readw(SSP_DR(pl022->virtbase)) & 0xFFU; | |
705 | break; | |
706 | case READING_U16: | |
707 | *(u16 *) (pl022->rx) = | |
708 | (u16) readw(SSP_DR(pl022->virtbase)); | |
709 | break; | |
710 | case READING_U32: | |
711 | *(u32 *) (pl022->rx) = | |
712 | readl(SSP_DR(pl022->virtbase)); | |
713 | break; | |
714 | } | |
715 | pl022->rx += (pl022->cur_chip->n_bytes); | |
fc05475f | 716 | pl022->exp_fifo_level--; |
b43d65f7 LW |
717 | } |
718 | } | |
719 | /* | |
720 | * When we exit here the TX FIFO should be full and the RX FIFO | |
721 | * should be empty | |
722 | */ | |
723 | } | |
724 | ||
b43d65f7 LW |
725 | /** |
726 | * next_transfer - Move to the Next transfer in the current spi message | |
727 | * @pl022: SSP driver private data structure | |
728 | * | |
729 | * This function moves though the linked list of spi transfers in the | |
730 | * current spi message and returns with the state of current spi | |
731 | * message i.e whether its last transfer is done(STATE_DONE) or | |
732 | * Next transfer is ready(STATE_RUNNING) | |
733 | */ | |
734 | static void *next_transfer(struct pl022 *pl022) | |
735 | { | |
736 | struct spi_message *msg = pl022->cur_msg; | |
737 | struct spi_transfer *trans = pl022->cur_transfer; | |
738 | ||
739 | /* Move to next transfer */ | |
740 | if (trans->transfer_list.next != &msg->transfers) { | |
741 | pl022->cur_transfer = | |
742 | list_entry(trans->transfer_list.next, | |
743 | struct spi_transfer, transfer_list); | |
744 | return STATE_RUNNING; | |
745 | } | |
746 | return STATE_DONE; | |
747 | } | |
b1b6b9aa LW |
748 | |
749 | /* | |
750 | * This DMA functionality is only compiled in if we have | |
751 | * access to the generic DMA devices/DMA engine. | |
752 | */ | |
753 | #ifdef CONFIG_DMA_ENGINE | |
754 | static void unmap_free_dma_scatter(struct pl022 *pl022) | |
755 | { | |
756 | /* Unmap and free the SG tables */ | |
b7298896 | 757 | dma_unmap_sg(pl022->dma_tx_channel->device->dev, pl022->sgt_tx.sgl, |
b1b6b9aa | 758 | pl022->sgt_tx.nents, DMA_TO_DEVICE); |
b7298896 | 759 | dma_unmap_sg(pl022->dma_rx_channel->device->dev, pl022->sgt_rx.sgl, |
b1b6b9aa LW |
760 | pl022->sgt_rx.nents, DMA_FROM_DEVICE); |
761 | sg_free_table(&pl022->sgt_rx); | |
762 | sg_free_table(&pl022->sgt_tx); | |
763 | } | |
764 | ||
765 | static void dma_callback(void *data) | |
766 | { | |
767 | struct pl022 *pl022 = data; | |
768 | struct spi_message *msg = pl022->cur_msg; | |
769 | ||
770 | BUG_ON(!pl022->sgt_rx.sgl); | |
771 | ||
772 | #ifdef VERBOSE_DEBUG | |
773 | /* | |
774 | * Optionally dump out buffers to inspect contents, this is | |
775 | * good if you want to convince yourself that the loopback | |
776 | * read/write contents are the same, when adopting to a new | |
777 | * DMA engine. | |
778 | */ | |
779 | { | |
780 | struct scatterlist *sg; | |
781 | unsigned int i; | |
782 | ||
783 | dma_sync_sg_for_cpu(&pl022->adev->dev, | |
784 | pl022->sgt_rx.sgl, | |
785 | pl022->sgt_rx.nents, | |
786 | DMA_FROM_DEVICE); | |
787 | ||
788 | for_each_sg(pl022->sgt_rx.sgl, sg, pl022->sgt_rx.nents, i) { | |
789 | dev_dbg(&pl022->adev->dev, "SPI RX SG ENTRY: %d", i); | |
790 | print_hex_dump(KERN_ERR, "SPI RX: ", | |
791 | DUMP_PREFIX_OFFSET, | |
792 | 16, | |
793 | 1, | |
794 | sg_virt(sg), | |
795 | sg_dma_len(sg), | |
796 | 1); | |
797 | } | |
798 | for_each_sg(pl022->sgt_tx.sgl, sg, pl022->sgt_tx.nents, i) { | |
799 | dev_dbg(&pl022->adev->dev, "SPI TX SG ENTRY: %d", i); | |
800 | print_hex_dump(KERN_ERR, "SPI TX: ", | |
801 | DUMP_PREFIX_OFFSET, | |
802 | 16, | |
803 | 1, | |
804 | sg_virt(sg), | |
805 | sg_dma_len(sg), | |
806 | 1); | |
807 | } | |
808 | } | |
809 | #endif | |
810 | ||
811 | unmap_free_dma_scatter(pl022); | |
812 | ||
25985edc | 813 | /* Update total bytes transferred */ |
b1b6b9aa LW |
814 | msg->actual_length += pl022->cur_transfer->len; |
815 | if (pl022->cur_transfer->cs_change) | |
816 | pl022->cur_chip-> | |
817 | cs_control(SSP_CHIP_DESELECT); | |
818 | ||
819 | /* Move to next transfer */ | |
820 | msg->state = next_transfer(pl022); | |
821 | tasklet_schedule(&pl022->pump_transfers); | |
822 | } | |
823 | ||
824 | static void setup_dma_scatter(struct pl022 *pl022, | |
825 | void *buffer, | |
826 | unsigned int length, | |
827 | struct sg_table *sgtab) | |
828 | { | |
829 | struct scatterlist *sg; | |
830 | int bytesleft = length; | |
831 | void *bufp = buffer; | |
832 | int mapbytes; | |
833 | int i; | |
834 | ||
835 | if (buffer) { | |
836 | for_each_sg(sgtab->sgl, sg, sgtab->nents, i) { | |
837 | /* | |
838 | * If there are less bytes left than what fits | |
839 | * in the current page (plus page alignment offset) | |
840 | * we just feed in this, else we stuff in as much | |
841 | * as we can. | |
842 | */ | |
843 | if (bytesleft < (PAGE_SIZE - offset_in_page(bufp))) | |
844 | mapbytes = bytesleft; | |
845 | else | |
846 | mapbytes = PAGE_SIZE - offset_in_page(bufp); | |
847 | sg_set_page(sg, virt_to_page(bufp), | |
848 | mapbytes, offset_in_page(bufp)); | |
849 | bufp += mapbytes; | |
850 | bytesleft -= mapbytes; | |
851 | dev_dbg(&pl022->adev->dev, | |
852 | "set RX/TX target page @ %p, %d bytes, %d left\n", | |
853 | bufp, mapbytes, bytesleft); | |
854 | } | |
855 | } else { | |
856 | /* Map the dummy buffer on every page */ | |
857 | for_each_sg(sgtab->sgl, sg, sgtab->nents, i) { | |
858 | if (bytesleft < PAGE_SIZE) | |
859 | mapbytes = bytesleft; | |
860 | else | |
861 | mapbytes = PAGE_SIZE; | |
862 | sg_set_page(sg, virt_to_page(pl022->dummypage), | |
863 | mapbytes, 0); | |
864 | bytesleft -= mapbytes; | |
865 | dev_dbg(&pl022->adev->dev, | |
866 | "set RX/TX to dummy page %d bytes, %d left\n", | |
867 | mapbytes, bytesleft); | |
868 | ||
869 | } | |
870 | } | |
871 | BUG_ON(bytesleft); | |
872 | } | |
873 | ||
874 | /** | |
875 | * configure_dma - configures the channels for the next transfer | |
876 | * @pl022: SSP driver's private data structure | |
877 | */ | |
878 | static int configure_dma(struct pl022 *pl022) | |
879 | { | |
880 | struct dma_slave_config rx_conf = { | |
881 | .src_addr = SSP_DR(pl022->phybase), | |
a485df4b | 882 | .direction = DMA_DEV_TO_MEM, |
b1b6b9aa LW |
883 | }; |
884 | struct dma_slave_config tx_conf = { | |
885 | .dst_addr = SSP_DR(pl022->phybase), | |
a485df4b | 886 | .direction = DMA_MEM_TO_DEV, |
b1b6b9aa LW |
887 | }; |
888 | unsigned int pages; | |
889 | int ret; | |
082086f2 | 890 | int rx_sglen, tx_sglen; |
b1b6b9aa LW |
891 | struct dma_chan *rxchan = pl022->dma_rx_channel; |
892 | struct dma_chan *txchan = pl022->dma_tx_channel; | |
893 | struct dma_async_tx_descriptor *rxdesc; | |
894 | struct dma_async_tx_descriptor *txdesc; | |
b1b6b9aa LW |
895 | |
896 | /* Check that the channels are available */ | |
897 | if (!rxchan || !txchan) | |
898 | return -ENODEV; | |
899 | ||
083be3f0 LW |
900 | /* |
901 | * If supplied, the DMA burstsize should equal the FIFO trigger level. | |
902 | * Notice that the DMA engine uses one-to-one mapping. Since we can | |
903 | * not trigger on 2 elements this needs explicit mapping rather than | |
904 | * calculation. | |
905 | */ | |
906 | switch (pl022->rx_lev_trig) { | |
907 | case SSP_RX_1_OR_MORE_ELEM: | |
908 | rx_conf.src_maxburst = 1; | |
909 | break; | |
910 | case SSP_RX_4_OR_MORE_ELEM: | |
911 | rx_conf.src_maxburst = 4; | |
912 | break; | |
913 | case SSP_RX_8_OR_MORE_ELEM: | |
914 | rx_conf.src_maxburst = 8; | |
915 | break; | |
916 | case SSP_RX_16_OR_MORE_ELEM: | |
917 | rx_conf.src_maxburst = 16; | |
918 | break; | |
919 | case SSP_RX_32_OR_MORE_ELEM: | |
920 | rx_conf.src_maxburst = 32; | |
921 | break; | |
922 | default: | |
923 | rx_conf.src_maxburst = pl022->vendor->fifodepth >> 1; | |
924 | break; | |
925 | } | |
926 | ||
927 | switch (pl022->tx_lev_trig) { | |
928 | case SSP_TX_1_OR_MORE_EMPTY_LOC: | |
929 | tx_conf.dst_maxburst = 1; | |
930 | break; | |
931 | case SSP_TX_4_OR_MORE_EMPTY_LOC: | |
932 | tx_conf.dst_maxburst = 4; | |
933 | break; | |
934 | case SSP_TX_8_OR_MORE_EMPTY_LOC: | |
935 | tx_conf.dst_maxburst = 8; | |
936 | break; | |
937 | case SSP_TX_16_OR_MORE_EMPTY_LOC: | |
938 | tx_conf.dst_maxburst = 16; | |
939 | break; | |
940 | case SSP_TX_32_OR_MORE_EMPTY_LOC: | |
941 | tx_conf.dst_maxburst = 32; | |
942 | break; | |
943 | default: | |
944 | tx_conf.dst_maxburst = pl022->vendor->fifodepth >> 1; | |
945 | break; | |
946 | } | |
947 | ||
b1b6b9aa LW |
948 | switch (pl022->read) { |
949 | case READING_NULL: | |
950 | /* Use the same as for writing */ | |
951 | rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; | |
952 | break; | |
953 | case READING_U8: | |
954 | rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
955 | break; | |
956 | case READING_U16: | |
957 | rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
958 | break; | |
959 | case READING_U32: | |
960 | rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
961 | break; | |
962 | } | |
963 | ||
964 | switch (pl022->write) { | |
965 | case WRITING_NULL: | |
966 | /* Use the same as for reading */ | |
967 | tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; | |
968 | break; | |
969 | case WRITING_U8: | |
970 | tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
971 | break; | |
972 | case WRITING_U16: | |
973 | tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
974 | break; | |
975 | case WRITING_U32: | |
bc3f67a3 | 976 | tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
b1b6b9aa LW |
977 | break; |
978 | } | |
979 | ||
980 | /* SPI pecularity: we need to read and write the same width */ | |
981 | if (rx_conf.src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) | |
982 | rx_conf.src_addr_width = tx_conf.dst_addr_width; | |
983 | if (tx_conf.dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) | |
984 | tx_conf.dst_addr_width = rx_conf.src_addr_width; | |
985 | BUG_ON(rx_conf.src_addr_width != tx_conf.dst_addr_width); | |
986 | ||
ecd442fd LW |
987 | dmaengine_slave_config(rxchan, &rx_conf); |
988 | dmaengine_slave_config(txchan, &tx_conf); | |
b1b6b9aa LW |
989 | |
990 | /* Create sglists for the transfers */ | |
b181565e | 991 | pages = DIV_ROUND_UP(pl022->cur_transfer->len, PAGE_SIZE); |
b1b6b9aa LW |
992 | dev_dbg(&pl022->adev->dev, "using %d pages for transfer\n", pages); |
993 | ||
538a18dc | 994 | ret = sg_alloc_table(&pl022->sgt_rx, pages, GFP_ATOMIC); |
b1b6b9aa LW |
995 | if (ret) |
996 | goto err_alloc_rx_sg; | |
997 | ||
538a18dc | 998 | ret = sg_alloc_table(&pl022->sgt_tx, pages, GFP_ATOMIC); |
b1b6b9aa LW |
999 | if (ret) |
1000 | goto err_alloc_tx_sg; | |
1001 | ||
1002 | /* Fill in the scatterlists for the RX+TX buffers */ | |
1003 | setup_dma_scatter(pl022, pl022->rx, | |
1004 | pl022->cur_transfer->len, &pl022->sgt_rx); | |
1005 | setup_dma_scatter(pl022, pl022->tx, | |
1006 | pl022->cur_transfer->len, &pl022->sgt_tx); | |
1007 | ||
1008 | /* Map DMA buffers */ | |
082086f2 | 1009 | rx_sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl, |
b1b6b9aa | 1010 | pl022->sgt_rx.nents, DMA_FROM_DEVICE); |
082086f2 | 1011 | if (!rx_sglen) |
b1b6b9aa LW |
1012 | goto err_rx_sgmap; |
1013 | ||
082086f2 | 1014 | tx_sglen = dma_map_sg(txchan->device->dev, pl022->sgt_tx.sgl, |
b1b6b9aa | 1015 | pl022->sgt_tx.nents, DMA_TO_DEVICE); |
082086f2 | 1016 | if (!tx_sglen) |
b1b6b9aa LW |
1017 | goto err_tx_sgmap; |
1018 | ||
1019 | /* Send both scatterlists */ | |
1020 | rxdesc = rxchan->device->device_prep_slave_sg(rxchan, | |
1021 | pl022->sgt_rx.sgl, | |
082086f2 | 1022 | rx_sglen, |
a485df4b | 1023 | DMA_DEV_TO_MEM, |
b1b6b9aa LW |
1024 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
1025 | if (!rxdesc) | |
1026 | goto err_rxdesc; | |
1027 | ||
1028 | txdesc = txchan->device->device_prep_slave_sg(txchan, | |
1029 | pl022->sgt_tx.sgl, | |
082086f2 | 1030 | tx_sglen, |
a485df4b | 1031 | DMA_MEM_TO_DEV, |
b1b6b9aa LW |
1032 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
1033 | if (!txdesc) | |
1034 | goto err_txdesc; | |
1035 | ||
1036 | /* Put the callback on the RX transfer only, that should finish last */ | |
1037 | rxdesc->callback = dma_callback; | |
1038 | rxdesc->callback_param = pl022; | |
1039 | ||
1040 | /* Submit and fire RX and TX with TX last so we're ready to read! */ | |
ecd442fd LW |
1041 | dmaengine_submit(rxdesc); |
1042 | dmaengine_submit(txdesc); | |
1043 | dma_async_issue_pending(rxchan); | |
1044 | dma_async_issue_pending(txchan); | |
ffbbdd21 | 1045 | pl022->dma_running = true; |
b1b6b9aa LW |
1046 | |
1047 | return 0; | |
1048 | ||
b1b6b9aa | 1049 | err_txdesc: |
ecd442fd | 1050 | dmaengine_terminate_all(txchan); |
b1b6b9aa | 1051 | err_rxdesc: |
ecd442fd | 1052 | dmaengine_terminate_all(rxchan); |
b7298896 | 1053 | dma_unmap_sg(txchan->device->dev, pl022->sgt_tx.sgl, |
b1b6b9aa LW |
1054 | pl022->sgt_tx.nents, DMA_TO_DEVICE); |
1055 | err_tx_sgmap: | |
b7298896 | 1056 | dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl, |
b1b6b9aa LW |
1057 | pl022->sgt_tx.nents, DMA_FROM_DEVICE); |
1058 | err_rx_sgmap: | |
1059 | sg_free_table(&pl022->sgt_tx); | |
1060 | err_alloc_tx_sg: | |
1061 | sg_free_table(&pl022->sgt_rx); | |
1062 | err_alloc_rx_sg: | |
1063 | return -ENOMEM; | |
1064 | } | |
1065 | ||
1066 | static int __init pl022_dma_probe(struct pl022 *pl022) | |
1067 | { | |
1068 | dma_cap_mask_t mask; | |
1069 | ||
1070 | /* Try to acquire a generic DMA engine slave channel */ | |
1071 | dma_cap_zero(mask); | |
1072 | dma_cap_set(DMA_SLAVE, mask); | |
1073 | /* | |
1074 | * We need both RX and TX channels to do DMA, else do none | |
1075 | * of them. | |
1076 | */ | |
1077 | pl022->dma_rx_channel = dma_request_channel(mask, | |
1078 | pl022->master_info->dma_filter, | |
1079 | pl022->master_info->dma_rx_param); | |
1080 | if (!pl022->dma_rx_channel) { | |
43c64015 | 1081 | dev_dbg(&pl022->adev->dev, "no RX DMA channel!\n"); |
b1b6b9aa LW |
1082 | goto err_no_rxchan; |
1083 | } | |
1084 | ||
1085 | pl022->dma_tx_channel = dma_request_channel(mask, | |
1086 | pl022->master_info->dma_filter, | |
1087 | pl022->master_info->dma_tx_param); | |
1088 | if (!pl022->dma_tx_channel) { | |
43c64015 | 1089 | dev_dbg(&pl022->adev->dev, "no TX DMA channel!\n"); |
b1b6b9aa LW |
1090 | goto err_no_txchan; |
1091 | } | |
1092 | ||
1093 | pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1094 | if (!pl022->dummypage) { | |
43c64015 | 1095 | dev_dbg(&pl022->adev->dev, "no DMA dummypage!\n"); |
b1b6b9aa LW |
1096 | goto err_no_dummypage; |
1097 | } | |
1098 | ||
1099 | dev_info(&pl022->adev->dev, "setup for DMA on RX %s, TX %s\n", | |
1100 | dma_chan_name(pl022->dma_rx_channel), | |
1101 | dma_chan_name(pl022->dma_tx_channel)); | |
1102 | ||
1103 | return 0; | |
1104 | ||
1105 | err_no_dummypage: | |
1106 | dma_release_channel(pl022->dma_tx_channel); | |
1107 | err_no_txchan: | |
1108 | dma_release_channel(pl022->dma_rx_channel); | |
1109 | pl022->dma_rx_channel = NULL; | |
1110 | err_no_rxchan: | |
43c64015 VK |
1111 | dev_err(&pl022->adev->dev, |
1112 | "Failed to work in dma mode, work without dma!\n"); | |
b1b6b9aa LW |
1113 | return -ENODEV; |
1114 | } | |
1115 | ||
1116 | static void terminate_dma(struct pl022 *pl022) | |
1117 | { | |
1118 | struct dma_chan *rxchan = pl022->dma_rx_channel; | |
1119 | struct dma_chan *txchan = pl022->dma_tx_channel; | |
1120 | ||
ecd442fd LW |
1121 | dmaengine_terminate_all(rxchan); |
1122 | dmaengine_terminate_all(txchan); | |
b1b6b9aa | 1123 | unmap_free_dma_scatter(pl022); |
ffbbdd21 | 1124 | pl022->dma_running = false; |
b1b6b9aa LW |
1125 | } |
1126 | ||
1127 | static void pl022_dma_remove(struct pl022 *pl022) | |
1128 | { | |
ffbbdd21 | 1129 | if (pl022->dma_running) |
b1b6b9aa LW |
1130 | terminate_dma(pl022); |
1131 | if (pl022->dma_tx_channel) | |
1132 | dma_release_channel(pl022->dma_tx_channel); | |
1133 | if (pl022->dma_rx_channel) | |
1134 | dma_release_channel(pl022->dma_rx_channel); | |
1135 | kfree(pl022->dummypage); | |
1136 | } | |
1137 | ||
1138 | #else | |
1139 | static inline int configure_dma(struct pl022 *pl022) | |
1140 | { | |
1141 | return -ENODEV; | |
1142 | } | |
1143 | ||
1144 | static inline int pl022_dma_probe(struct pl022 *pl022) | |
1145 | { | |
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | static inline void pl022_dma_remove(struct pl022 *pl022) | |
1150 | { | |
1151 | } | |
1152 | #endif | |
1153 | ||
b43d65f7 LW |
1154 | /** |
1155 | * pl022_interrupt_handler - Interrupt handler for SSP controller | |
1156 | * | |
1157 | * This function handles interrupts generated for an interrupt based transfer. | |
1158 | * If a receive overrun (ROR) interrupt is there then we disable SSP, flag the | |
1159 | * current message's state as STATE_ERROR and schedule the tasklet | |
1160 | * pump_transfers which will do the postprocessing of the current message by | |
1161 | * calling giveback(). Otherwise it reads data from RX FIFO till there is no | |
1162 | * more data, and writes data in TX FIFO till it is not full. If we complete | |
1163 | * the transfer we move to the next transfer and schedule the tasklet. | |
1164 | */ | |
1165 | static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id) | |
1166 | { | |
1167 | struct pl022 *pl022 = dev_id; | |
1168 | struct spi_message *msg = pl022->cur_msg; | |
1169 | u16 irq_status = 0; | |
1170 | u16 flag = 0; | |
1171 | ||
1172 | if (unlikely(!msg)) { | |
1173 | dev_err(&pl022->adev->dev, | |
1174 | "bad message state in interrupt handler"); | |
1175 | /* Never fail */ | |
1176 | return IRQ_HANDLED; | |
1177 | } | |
1178 | ||
1179 | /* Read the Interrupt Status Register */ | |
1180 | irq_status = readw(SSP_MIS(pl022->virtbase)); | |
1181 | ||
1182 | if (unlikely(!irq_status)) | |
1183 | return IRQ_NONE; | |
1184 | ||
b1b6b9aa LW |
1185 | /* |
1186 | * This handles the FIFO interrupts, the timeout | |
1187 | * interrupts are flatly ignored, they cannot be | |
1188 | * trusted. | |
1189 | */ | |
b43d65f7 LW |
1190 | if (unlikely(irq_status & SSP_MIS_MASK_RORMIS)) { |
1191 | /* | |
1192 | * Overrun interrupt - bail out since our Data has been | |
1193 | * corrupted | |
1194 | */ | |
b1b6b9aa | 1195 | dev_err(&pl022->adev->dev, "FIFO overrun\n"); |
b43d65f7 LW |
1196 | if (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RFF) |
1197 | dev_err(&pl022->adev->dev, | |
1198 | "RXFIFO is full\n"); | |
1199 | if (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_TNF) | |
1200 | dev_err(&pl022->adev->dev, | |
1201 | "TXFIFO is full\n"); | |
1202 | ||
1203 | /* | |
1204 | * Disable and clear interrupts, disable SSP, | |
1205 | * mark message with bad status so it can be | |
1206 | * retried. | |
1207 | */ | |
1208 | writew(DISABLE_ALL_INTERRUPTS, | |
1209 | SSP_IMSC(pl022->virtbase)); | |
1210 | writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); | |
1211 | writew((readw(SSP_CR1(pl022->virtbase)) & | |
1212 | (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); | |
1213 | msg->state = STATE_ERROR; | |
1214 | ||
1215 | /* Schedule message queue handler */ | |
1216 | tasklet_schedule(&pl022->pump_transfers); | |
1217 | return IRQ_HANDLED; | |
1218 | } | |
1219 | ||
1220 | readwriter(pl022); | |
1221 | ||
1222 | if ((pl022->tx == pl022->tx_end) && (flag == 0)) { | |
1223 | flag = 1; | |
172289df CB |
1224 | /* Disable Transmit interrupt, enable receive interrupt */ |
1225 | writew((readw(SSP_IMSC(pl022->virtbase)) & | |
1226 | ~SSP_IMSC_MASK_TXIM) | SSP_IMSC_MASK_RXIM, | |
b43d65f7 LW |
1227 | SSP_IMSC(pl022->virtbase)); |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * Since all transactions must write as much as shall be read, | |
1232 | * we can conclude the entire transaction once RX is complete. | |
1233 | * At this point, all TX will always be finished. | |
1234 | */ | |
1235 | if (pl022->rx >= pl022->rx_end) { | |
1236 | writew(DISABLE_ALL_INTERRUPTS, | |
1237 | SSP_IMSC(pl022->virtbase)); | |
1238 | writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); | |
1239 | if (unlikely(pl022->rx > pl022->rx_end)) { | |
1240 | dev_warn(&pl022->adev->dev, "read %u surplus " | |
1241 | "bytes (did you request an odd " | |
1242 | "number of bytes on a 16bit bus?)\n", | |
1243 | (u32) (pl022->rx - pl022->rx_end)); | |
1244 | } | |
25985edc | 1245 | /* Update total bytes transferred */ |
b43d65f7 LW |
1246 | msg->actual_length += pl022->cur_transfer->len; |
1247 | if (pl022->cur_transfer->cs_change) | |
1248 | pl022->cur_chip-> | |
1249 | cs_control(SSP_CHIP_DESELECT); | |
1250 | /* Move to next transfer */ | |
1251 | msg->state = next_transfer(pl022); | |
1252 | tasklet_schedule(&pl022->pump_transfers); | |
1253 | return IRQ_HANDLED; | |
1254 | } | |
1255 | ||
1256 | return IRQ_HANDLED; | |
1257 | } | |
1258 | ||
1259 | /** | |
1260 | * This sets up the pointers to memory for the next message to | |
1261 | * send out on the SPI bus. | |
1262 | */ | |
1263 | static int set_up_next_transfer(struct pl022 *pl022, | |
1264 | struct spi_transfer *transfer) | |
1265 | { | |
1266 | int residue; | |
1267 | ||
1268 | /* Sanity check the message for this bus width */ | |
1269 | residue = pl022->cur_transfer->len % pl022->cur_chip->n_bytes; | |
1270 | if (unlikely(residue != 0)) { | |
1271 | dev_err(&pl022->adev->dev, | |
1272 | "message of %u bytes to transmit but the current " | |
1273 | "chip bus has a data width of %u bytes!\n", | |
1274 | pl022->cur_transfer->len, | |
1275 | pl022->cur_chip->n_bytes); | |
1276 | dev_err(&pl022->adev->dev, "skipping this message\n"); | |
1277 | return -EIO; | |
1278 | } | |
1279 | pl022->tx = (void *)transfer->tx_buf; | |
1280 | pl022->tx_end = pl022->tx + pl022->cur_transfer->len; | |
1281 | pl022->rx = (void *)transfer->rx_buf; | |
1282 | pl022->rx_end = pl022->rx + pl022->cur_transfer->len; | |
1283 | pl022->write = | |
1284 | pl022->tx ? pl022->cur_chip->write : WRITING_NULL; | |
1285 | pl022->read = pl022->rx ? pl022->cur_chip->read : READING_NULL; | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | /** | |
b1b6b9aa LW |
1290 | * pump_transfers - Tasklet function which schedules next transfer |
1291 | * when running in interrupt or DMA transfer mode. | |
b43d65f7 LW |
1292 | * @data: SSP driver private data structure |
1293 | * | |
1294 | */ | |
1295 | static void pump_transfers(unsigned long data) | |
1296 | { | |
1297 | struct pl022 *pl022 = (struct pl022 *) data; | |
1298 | struct spi_message *message = NULL; | |
1299 | struct spi_transfer *transfer = NULL; | |
1300 | struct spi_transfer *previous = NULL; | |
1301 | ||
1302 | /* Get current state information */ | |
1303 | message = pl022->cur_msg; | |
1304 | transfer = pl022->cur_transfer; | |
1305 | ||
1306 | /* Handle for abort */ | |
1307 | if (message->state == STATE_ERROR) { | |
1308 | message->status = -EIO; | |
1309 | giveback(pl022); | |
1310 | return; | |
1311 | } | |
1312 | ||
1313 | /* Handle end of message */ | |
1314 | if (message->state == STATE_DONE) { | |
1315 | message->status = 0; | |
1316 | giveback(pl022); | |
1317 | return; | |
1318 | } | |
1319 | ||
1320 | /* Delay if requested at end of transfer before CS change */ | |
1321 | if (message->state == STATE_RUNNING) { | |
1322 | previous = list_entry(transfer->transfer_list.prev, | |
1323 | struct spi_transfer, | |
1324 | transfer_list); | |
1325 | if (previous->delay_usecs) | |
1326 | /* | |
1327 | * FIXME: This runs in interrupt context. | |
1328 | * Is this really smart? | |
1329 | */ | |
1330 | udelay(previous->delay_usecs); | |
1331 | ||
8b8d7191 | 1332 | /* Reselect chip select only if cs_change was requested */ |
b43d65f7 LW |
1333 | if (previous->cs_change) |
1334 | pl022->cur_chip->cs_control(SSP_CHIP_SELECT); | |
1335 | } else { | |
1336 | /* STATE_START */ | |
1337 | message->state = STATE_RUNNING; | |
1338 | } | |
1339 | ||
1340 | if (set_up_next_transfer(pl022, transfer)) { | |
1341 | message->state = STATE_ERROR; | |
1342 | message->status = -EIO; | |
1343 | giveback(pl022); | |
1344 | return; | |
1345 | } | |
1346 | /* Flush the FIFOs and let's go! */ | |
1347 | flush(pl022); | |
b43d65f7 | 1348 | |
b1b6b9aa LW |
1349 | if (pl022->cur_chip->enable_dma) { |
1350 | if (configure_dma(pl022)) { | |
1351 | dev_dbg(&pl022->adev->dev, | |
1352 | "configuration of DMA failed, fall back to interrupt mode\n"); | |
1353 | goto err_config_dma; | |
1354 | } | |
b43d65f7 LW |
1355 | return; |
1356 | } | |
b43d65f7 | 1357 | |
b1b6b9aa | 1358 | err_config_dma: |
172289df CB |
1359 | /* enable all interrupts except RX */ |
1360 | writew(ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM, SSP_IMSC(pl022->virtbase)); | |
b43d65f7 LW |
1361 | } |
1362 | ||
b1b6b9aa | 1363 | static void do_interrupt_dma_transfer(struct pl022 *pl022) |
b43d65f7 | 1364 | { |
172289df CB |
1365 | /* |
1366 | * Default is to enable all interrupts except RX - | |
1367 | * this will be enabled once TX is complete | |
1368 | */ | |
1369 | u32 irqflags = ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM; | |
b43d65f7 | 1370 | |
8b8d7191 VS |
1371 | /* Enable target chip, if not already active */ |
1372 | if (!pl022->next_msg_cs_active) | |
1373 | pl022->cur_chip->cs_control(SSP_CHIP_SELECT); | |
b43d65f7 | 1374 | |
b43d65f7 LW |
1375 | if (set_up_next_transfer(pl022, pl022->cur_transfer)) { |
1376 | /* Error path */ | |
1377 | pl022->cur_msg->state = STATE_ERROR; | |
1378 | pl022->cur_msg->status = -EIO; | |
1379 | giveback(pl022); | |
1380 | return; | |
1381 | } | |
b1b6b9aa LW |
1382 | /* If we're using DMA, set up DMA here */ |
1383 | if (pl022->cur_chip->enable_dma) { | |
1384 | /* Configure DMA transfer */ | |
1385 | if (configure_dma(pl022)) { | |
1386 | dev_dbg(&pl022->adev->dev, | |
1387 | "configuration of DMA failed, fall back to interrupt mode\n"); | |
1388 | goto err_config_dma; | |
1389 | } | |
1390 | /* Disable interrupts in DMA mode, IRQ from DMA controller */ | |
1391 | irqflags = DISABLE_ALL_INTERRUPTS; | |
1392 | } | |
1393 | err_config_dma: | |
b43d65f7 LW |
1394 | /* Enable SSP, turn on interrupts */ |
1395 | writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE), | |
1396 | SSP_CR1(pl022->virtbase)); | |
b1b6b9aa | 1397 | writew(irqflags, SSP_IMSC(pl022->virtbase)); |
b43d65f7 LW |
1398 | } |
1399 | ||
b1b6b9aa | 1400 | static void do_polling_transfer(struct pl022 *pl022) |
b43d65f7 | 1401 | { |
b43d65f7 LW |
1402 | struct spi_message *message = NULL; |
1403 | struct spi_transfer *transfer = NULL; | |
1404 | struct spi_transfer *previous = NULL; | |
1405 | struct chip_data *chip; | |
a18c266f | 1406 | unsigned long time, timeout; |
b43d65f7 LW |
1407 | |
1408 | chip = pl022->cur_chip; | |
1409 | message = pl022->cur_msg; | |
1410 | ||
1411 | while (message->state != STATE_DONE) { | |
1412 | /* Handle for abort */ | |
1413 | if (message->state == STATE_ERROR) | |
1414 | break; | |
1415 | transfer = pl022->cur_transfer; | |
1416 | ||
1417 | /* Delay if requested at end of transfer */ | |
1418 | if (message->state == STATE_RUNNING) { | |
1419 | previous = | |
1420 | list_entry(transfer->transfer_list.prev, | |
1421 | struct spi_transfer, transfer_list); | |
1422 | if (previous->delay_usecs) | |
1423 | udelay(previous->delay_usecs); | |
1424 | if (previous->cs_change) | |
1425 | pl022->cur_chip->cs_control(SSP_CHIP_SELECT); | |
1426 | } else { | |
1427 | /* STATE_START */ | |
1428 | message->state = STATE_RUNNING; | |
8b8d7191 VS |
1429 | if (!pl022->next_msg_cs_active) |
1430 | pl022->cur_chip->cs_control(SSP_CHIP_SELECT); | |
b43d65f7 LW |
1431 | } |
1432 | ||
1433 | /* Configuration Changing Per Transfer */ | |
1434 | if (set_up_next_transfer(pl022, transfer)) { | |
1435 | /* Error path */ | |
1436 | message->state = STATE_ERROR; | |
1437 | break; | |
1438 | } | |
1439 | /* Flush FIFOs and enable SSP */ | |
1440 | flush(pl022); | |
1441 | writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE), | |
1442 | SSP_CR1(pl022->virtbase)); | |
1443 | ||
556f4aeb | 1444 | dev_dbg(&pl022->adev->dev, "polling transfer ongoing ...\n"); |
a18c266f MT |
1445 | |
1446 | timeout = jiffies + msecs_to_jiffies(SPI_POLLING_TIMEOUT); | |
1447 | while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end) { | |
1448 | time = jiffies; | |
b43d65f7 | 1449 | readwriter(pl022); |
a18c266f MT |
1450 | if (time_after(time, timeout)) { |
1451 | dev_warn(&pl022->adev->dev, | |
1452 | "%s: timeout!\n", __func__); | |
1453 | message->state = STATE_ERROR; | |
1454 | goto out; | |
1455 | } | |
521999bd | 1456 | cpu_relax(); |
a18c266f | 1457 | } |
b43d65f7 | 1458 | |
25985edc | 1459 | /* Update total byte transferred */ |
b43d65f7 LW |
1460 | message->actual_length += pl022->cur_transfer->len; |
1461 | if (pl022->cur_transfer->cs_change) | |
1462 | pl022->cur_chip->cs_control(SSP_CHIP_DESELECT); | |
1463 | /* Move to next transfer */ | |
1464 | message->state = next_transfer(pl022); | |
1465 | } | |
a18c266f | 1466 | out: |
b43d65f7 LW |
1467 | /* Handle end of message */ |
1468 | if (message->state == STATE_DONE) | |
1469 | message->status = 0; | |
1470 | else | |
1471 | message->status = -EIO; | |
1472 | ||
1473 | giveback(pl022); | |
1474 | return; | |
1475 | } | |
1476 | ||
ffbbdd21 LW |
1477 | static int pl022_transfer_one_message(struct spi_master *master, |
1478 | struct spi_message *msg) | |
b43d65f7 | 1479 | { |
ffbbdd21 | 1480 | struct pl022 *pl022 = spi_master_get_devdata(master); |
b43d65f7 LW |
1481 | |
1482 | /* Initial message state */ | |
ffbbdd21 LW |
1483 | pl022->cur_msg = msg; |
1484 | msg->state = STATE_START; | |
1485 | ||
1486 | pl022->cur_transfer = list_entry(msg->transfers.next, | |
1487 | struct spi_transfer, transfer_list); | |
b43d65f7 LW |
1488 | |
1489 | /* Setup the SPI using the per chip configuration */ | |
ffbbdd21 | 1490 | pl022->cur_chip = spi_get_ctldata(msg->spi); |
d4b6af2e | 1491 | |
b43d65f7 LW |
1492 | restore_state(pl022); |
1493 | flush(pl022); | |
1494 | ||
1495 | if (pl022->cur_chip->xfer_type == POLLING_TRANSFER) | |
1496 | do_polling_transfer(pl022); | |
b43d65f7 | 1497 | else |
b1b6b9aa | 1498 | do_interrupt_dma_transfer(pl022); |
b43d65f7 LW |
1499 | |
1500 | return 0; | |
1501 | } | |
1502 | ||
ffbbdd21 | 1503 | static int pl022_prepare_transfer_hardware(struct spi_master *master) |
b43d65f7 | 1504 | { |
ffbbdd21 | 1505 | struct pl022 *pl022 = spi_master_get_devdata(master); |
b43d65f7 | 1506 | |
ffbbdd21 LW |
1507 | /* |
1508 | * Just make sure we have all we need to run the transfer by syncing | |
1509 | * with the runtime PM framework. | |
1510 | */ | |
1511 | pm_runtime_get_sync(&pl022->adev->dev); | |
b43d65f7 LW |
1512 | return 0; |
1513 | } | |
1514 | ||
ffbbdd21 | 1515 | static int pl022_unprepare_transfer_hardware(struct spi_master *master) |
b43d65f7 | 1516 | { |
ffbbdd21 | 1517 | struct pl022 *pl022 = spi_master_get_devdata(master); |
b43d65f7 | 1518 | |
ffbbdd21 LW |
1519 | /* nothing more to do - disable spi/ssp and power off */ |
1520 | writew((readw(SSP_CR1(pl022->virtbase)) & | |
1521 | (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); | |
b43d65f7 | 1522 | |
ffbbdd21 LW |
1523 | if (pl022->master_info->autosuspend_delay > 0) { |
1524 | pm_runtime_mark_last_busy(&pl022->adev->dev); | |
1525 | pm_runtime_put_autosuspend(&pl022->adev->dev); | |
1526 | } else { | |
1527 | pm_runtime_put(&pl022->adev->dev); | |
b43d65f7 LW |
1528 | } |
1529 | ||
b43d65f7 LW |
1530 | return 0; |
1531 | } | |
1532 | ||
1533 | static int verify_controller_parameters(struct pl022 *pl022, | |
f9d629c7 | 1534 | struct pl022_config_chip const *chip_info) |
b43d65f7 | 1535 | { |
b43d65f7 LW |
1536 | if ((chip_info->iface < SSP_INTERFACE_MOTOROLA_SPI) |
1537 | || (chip_info->iface > SSP_INTERFACE_UNIDIRECTIONAL)) { | |
5a1c98be | 1538 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1539 | "interface is configured incorrectly\n"); |
1540 | return -EINVAL; | |
1541 | } | |
1542 | if ((chip_info->iface == SSP_INTERFACE_UNIDIRECTIONAL) && | |
1543 | (!pl022->vendor->unidir)) { | |
5a1c98be | 1544 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1545 | "unidirectional mode not supported in this " |
1546 | "hardware version\n"); | |
1547 | return -EINVAL; | |
1548 | } | |
1549 | if ((chip_info->hierarchy != SSP_MASTER) | |
1550 | && (chip_info->hierarchy != SSP_SLAVE)) { | |
5a1c98be | 1551 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1552 | "hierarchy is configured incorrectly\n"); |
1553 | return -EINVAL; | |
1554 | } | |
b43d65f7 LW |
1555 | if ((chip_info->com_mode != INTERRUPT_TRANSFER) |
1556 | && (chip_info->com_mode != DMA_TRANSFER) | |
1557 | && (chip_info->com_mode != POLLING_TRANSFER)) { | |
5a1c98be | 1558 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1559 | "Communication mode is configured incorrectly\n"); |
1560 | return -EINVAL; | |
1561 | } | |
78b2b911 LW |
1562 | switch (chip_info->rx_lev_trig) { |
1563 | case SSP_RX_1_OR_MORE_ELEM: | |
1564 | case SSP_RX_4_OR_MORE_ELEM: | |
1565 | case SSP_RX_8_OR_MORE_ELEM: | |
1566 | /* These are always OK, all variants can handle this */ | |
1567 | break; | |
1568 | case SSP_RX_16_OR_MORE_ELEM: | |
1569 | if (pl022->vendor->fifodepth < 16) { | |
1570 | dev_err(&pl022->adev->dev, | |
1571 | "RX FIFO Trigger Level is configured incorrectly\n"); | |
1572 | return -EINVAL; | |
1573 | } | |
1574 | break; | |
1575 | case SSP_RX_32_OR_MORE_ELEM: | |
1576 | if (pl022->vendor->fifodepth < 32) { | |
1577 | dev_err(&pl022->adev->dev, | |
1578 | "RX FIFO Trigger Level is configured incorrectly\n"); | |
1579 | return -EINVAL; | |
1580 | } | |
1581 | break; | |
1582 | default: | |
5a1c98be | 1583 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1584 | "RX FIFO Trigger Level is configured incorrectly\n"); |
1585 | return -EINVAL; | |
78b2b911 | 1586 | break; |
b43d65f7 | 1587 | } |
78b2b911 LW |
1588 | switch (chip_info->tx_lev_trig) { |
1589 | case SSP_TX_1_OR_MORE_EMPTY_LOC: | |
1590 | case SSP_TX_4_OR_MORE_EMPTY_LOC: | |
1591 | case SSP_TX_8_OR_MORE_EMPTY_LOC: | |
1592 | /* These are always OK, all variants can handle this */ | |
1593 | break; | |
1594 | case SSP_TX_16_OR_MORE_EMPTY_LOC: | |
1595 | if (pl022->vendor->fifodepth < 16) { | |
1596 | dev_err(&pl022->adev->dev, | |
1597 | "TX FIFO Trigger Level is configured incorrectly\n"); | |
1598 | return -EINVAL; | |
1599 | } | |
1600 | break; | |
1601 | case SSP_TX_32_OR_MORE_EMPTY_LOC: | |
1602 | if (pl022->vendor->fifodepth < 32) { | |
1603 | dev_err(&pl022->adev->dev, | |
1604 | "TX FIFO Trigger Level is configured incorrectly\n"); | |
1605 | return -EINVAL; | |
1606 | } | |
1607 | break; | |
1608 | default: | |
5a1c98be | 1609 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1610 | "TX FIFO Trigger Level is configured incorrectly\n"); |
1611 | return -EINVAL; | |
78b2b911 | 1612 | break; |
b43d65f7 | 1613 | } |
b43d65f7 LW |
1614 | if (chip_info->iface == SSP_INTERFACE_NATIONAL_MICROWIRE) { |
1615 | if ((chip_info->ctrl_len < SSP_BITS_4) | |
1616 | || (chip_info->ctrl_len > SSP_BITS_32)) { | |
5a1c98be | 1617 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1618 | "CTRL LEN is configured incorrectly\n"); |
1619 | return -EINVAL; | |
1620 | } | |
1621 | if ((chip_info->wait_state != SSP_MWIRE_WAIT_ZERO) | |
1622 | && (chip_info->wait_state != SSP_MWIRE_WAIT_ONE)) { | |
5a1c98be | 1623 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1624 | "Wait State is configured incorrectly\n"); |
1625 | return -EINVAL; | |
1626 | } | |
556f4aeb LW |
1627 | /* Half duplex is only available in the ST Micro version */ |
1628 | if (pl022->vendor->extended_cr) { | |
1629 | if ((chip_info->duplex != | |
1630 | SSP_MICROWIRE_CHANNEL_FULL_DUPLEX) | |
1631 | && (chip_info->duplex != | |
4a4fd471 | 1632 | SSP_MICROWIRE_CHANNEL_HALF_DUPLEX)) { |
5a1c98be | 1633 | dev_err(&pl022->adev->dev, |
556f4aeb LW |
1634 | "Microwire duplex mode is configured incorrectly\n"); |
1635 | return -EINVAL; | |
4a4fd471 | 1636 | } |
556f4aeb LW |
1637 | } else { |
1638 | if (chip_info->duplex != SSP_MICROWIRE_CHANNEL_FULL_DUPLEX) | |
5a1c98be | 1639 | dev_err(&pl022->adev->dev, |
556f4aeb LW |
1640 | "Microwire half duplex mode requested," |
1641 | " but this is only available in the" | |
1642 | " ST version of PL022\n"); | |
b43d65f7 LW |
1643 | return -EINVAL; |
1644 | } | |
1645 | } | |
b43d65f7 LW |
1646 | return 0; |
1647 | } | |
1648 | ||
0379b2a3 VK |
1649 | static inline u32 spi_rate(u32 rate, u16 cpsdvsr, u16 scr) |
1650 | { | |
1651 | return rate / (cpsdvsr * (1 + scr)); | |
1652 | } | |
1653 | ||
1654 | static int calculate_effective_freq(struct pl022 *pl022, int freq, struct | |
1655 | ssp_clock_params * clk_freq) | |
b43d65f7 LW |
1656 | { |
1657 | /* Lets calculate the frequency parameters */ | |
0379b2a3 VK |
1658 | u16 cpsdvsr = CPSDVR_MIN, scr = SCR_MIN; |
1659 | u32 rate, max_tclk, min_tclk, best_freq = 0, best_cpsdvsr = 0, | |
1660 | best_scr = 0, tmp, found = 0; | |
b43d65f7 LW |
1661 | |
1662 | rate = clk_get_rate(pl022->clk); | |
1663 | /* cpsdvscr = 2 & scr 0 */ | |
0379b2a3 | 1664 | max_tclk = spi_rate(rate, CPSDVR_MIN, SCR_MIN); |
b43d65f7 | 1665 | /* cpsdvsr = 254 & scr = 255 */ |
0379b2a3 VK |
1666 | min_tclk = spi_rate(rate, CPSDVR_MAX, SCR_MAX); |
1667 | ||
1668 | if (!((freq <= max_tclk) && (freq >= min_tclk))) { | |
b43d65f7 LW |
1669 | dev_err(&pl022->adev->dev, |
1670 | "controller data is incorrect: out of range frequency"); | |
1671 | return -EINVAL; | |
1672 | } | |
0379b2a3 VK |
1673 | |
1674 | /* | |
1675 | * best_freq will give closest possible available rate (<= requested | |
1676 | * freq) for all values of scr & cpsdvsr. | |
1677 | */ | |
1678 | while ((cpsdvsr <= CPSDVR_MAX) && !found) { | |
1679 | while (scr <= SCR_MAX) { | |
1680 | tmp = spi_rate(rate, cpsdvsr, scr); | |
1681 | ||
1682 | if (tmp > freq) | |
1683 | scr++; | |
1684 | /* | |
1685 | * If found exact value, update and break. | |
1686 | * If found more closer value, update and continue. | |
1687 | */ | |
1688 | else if ((tmp == freq) || (tmp > best_freq)) { | |
1689 | best_freq = tmp; | |
1690 | best_cpsdvsr = cpsdvsr; | |
1691 | best_scr = scr; | |
1692 | ||
1693 | if (tmp == freq) | |
1694 | break; | |
1695 | } | |
1696 | scr++; | |
1697 | } | |
1698 | cpsdvsr += 2; | |
1699 | scr = SCR_MIN; | |
1700 | } | |
1701 | ||
1702 | clk_freq->cpsdvsr = (u8) (best_cpsdvsr & 0xFF); | |
1703 | clk_freq->scr = (u8) (best_scr & 0xFF); | |
1704 | dev_dbg(&pl022->adev->dev, | |
1705 | "SSP Target Frequency is: %u, Effective Frequency is %u\n", | |
1706 | freq, best_freq); | |
1707 | dev_dbg(&pl022->adev->dev, "SSP cpsdvsr = %d, scr = %d\n", | |
1708 | clk_freq->cpsdvsr, clk_freq->scr); | |
1709 | ||
b43d65f7 LW |
1710 | return 0; |
1711 | } | |
1712 | ||
f9d629c7 LW |
1713 | /* |
1714 | * A piece of default chip info unless the platform | |
1715 | * supplies it. | |
1716 | */ | |
1717 | static const struct pl022_config_chip pl022_default_chip_info = { | |
1718 | .com_mode = POLLING_TRANSFER, | |
1719 | .iface = SSP_INTERFACE_MOTOROLA_SPI, | |
1720 | .hierarchy = SSP_SLAVE, | |
1721 | .slave_tx_disable = DO_NOT_DRIVE_TX, | |
1722 | .rx_lev_trig = SSP_RX_1_OR_MORE_ELEM, | |
1723 | .tx_lev_trig = SSP_TX_1_OR_MORE_EMPTY_LOC, | |
1724 | .ctrl_len = SSP_BITS_8, | |
1725 | .wait_state = SSP_MWIRE_WAIT_ZERO, | |
1726 | .duplex = SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, | |
1727 | .cs_control = null_cs_control, | |
1728 | }; | |
1729 | ||
b43d65f7 LW |
1730 | /** |
1731 | * pl022_setup - setup function registered to SPI master framework | |
1732 | * @spi: spi device which is requesting setup | |
1733 | * | |
1734 | * This function is registered to the SPI framework for this SPI master | |
1735 | * controller. If it is the first time when setup is called by this device, | |
1736 | * this function will initialize the runtime state for this chip and save | |
1737 | * the same in the device structure. Else it will update the runtime info | |
1738 | * with the updated chip info. Nothing is really being written to the | |
1739 | * controller hardware here, that is not done until the actual transfer | |
1740 | * commence. | |
1741 | */ | |
b43d65f7 LW |
1742 | static int pl022_setup(struct spi_device *spi) |
1743 | { | |
f9d629c7 | 1744 | struct pl022_config_chip const *chip_info; |
b43d65f7 | 1745 | struct chip_data *chip; |
c4a47843 | 1746 | struct ssp_clock_params clk_freq = { .cpsdvsr = 0, .scr = 0}; |
b43d65f7 LW |
1747 | int status = 0; |
1748 | struct pl022 *pl022 = spi_master_get_devdata(spi->master); | |
bde435a9 KW |
1749 | unsigned int bits = spi->bits_per_word; |
1750 | u32 tmp; | |
b43d65f7 LW |
1751 | |
1752 | if (!spi->max_speed_hz) | |
1753 | return -EINVAL; | |
1754 | ||
1755 | /* Get controller_state if one is supplied */ | |
1756 | chip = spi_get_ctldata(spi); | |
1757 | ||
1758 | if (chip == NULL) { | |
1759 | chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); | |
1760 | if (!chip) { | |
1761 | dev_err(&spi->dev, | |
1762 | "cannot allocate controller state\n"); | |
1763 | return -ENOMEM; | |
1764 | } | |
1765 | dev_dbg(&spi->dev, | |
1766 | "allocated memory for controller's runtime state\n"); | |
1767 | } | |
1768 | ||
1769 | /* Get controller data if one is supplied */ | |
1770 | chip_info = spi->controller_data; | |
1771 | ||
1772 | if (chip_info == NULL) { | |
f9d629c7 | 1773 | chip_info = &pl022_default_chip_info; |
b43d65f7 LW |
1774 | /* spi_board_info.controller_data not is supplied */ |
1775 | dev_dbg(&spi->dev, | |
1776 | "using default controller_data settings\n"); | |
f9d629c7 | 1777 | } else |
b43d65f7 LW |
1778 | dev_dbg(&spi->dev, |
1779 | "using user supplied controller_data settings\n"); | |
b43d65f7 LW |
1780 | |
1781 | /* | |
1782 | * We can override with custom divisors, else we use the board | |
1783 | * frequency setting | |
1784 | */ | |
1785 | if ((0 == chip_info->clk_freq.cpsdvsr) | |
1786 | && (0 == chip_info->clk_freq.scr)) { | |
1787 | status = calculate_effective_freq(pl022, | |
1788 | spi->max_speed_hz, | |
f9d629c7 | 1789 | &clk_freq); |
b43d65f7 LW |
1790 | if (status < 0) |
1791 | goto err_config_params; | |
1792 | } else { | |
f9d629c7 LW |
1793 | memcpy(&clk_freq, &chip_info->clk_freq, sizeof(clk_freq)); |
1794 | if ((clk_freq.cpsdvsr % 2) != 0) | |
1795 | clk_freq.cpsdvsr = | |
1796 | clk_freq.cpsdvsr - 1; | |
b43d65f7 | 1797 | } |
f9d629c7 LW |
1798 | if ((clk_freq.cpsdvsr < CPSDVR_MIN) |
1799 | || (clk_freq.cpsdvsr > CPSDVR_MAX)) { | |
e3f88ae9 | 1800 | status = -EINVAL; |
f9d629c7 LW |
1801 | dev_err(&spi->dev, |
1802 | "cpsdvsr is configured incorrectly\n"); | |
1803 | goto err_config_params; | |
1804 | } | |
1805 | ||
b43d65f7 LW |
1806 | status = verify_controller_parameters(pl022, chip_info); |
1807 | if (status) { | |
1808 | dev_err(&spi->dev, "controller data is incorrect"); | |
1809 | goto err_config_params; | |
1810 | } | |
f9d629c7 | 1811 | |
083be3f0 LW |
1812 | pl022->rx_lev_trig = chip_info->rx_lev_trig; |
1813 | pl022->tx_lev_trig = chip_info->tx_lev_trig; | |
1814 | ||
b43d65f7 LW |
1815 | /* Now set controller state based on controller data */ |
1816 | chip->xfer_type = chip_info->com_mode; | |
f9d629c7 LW |
1817 | if (!chip_info->cs_control) { |
1818 | chip->cs_control = null_cs_control; | |
1819 | dev_warn(&spi->dev, | |
1820 | "chip select function is NULL for this chip\n"); | |
1821 | } else | |
1822 | chip->cs_control = chip_info->cs_control; | |
b43d65f7 | 1823 | |
bde435a9 KW |
1824 | if (bits <= 3) { |
1825 | /* PL022 doesn't support less than 4-bits */ | |
1826 | status = -ENOTSUPP; | |
1827 | goto err_config_params; | |
1828 | } else if (bits <= 8) { | |
1829 | dev_dbg(&spi->dev, "4 <= n <=8 bits per word\n"); | |
b43d65f7 LW |
1830 | chip->n_bytes = 1; |
1831 | chip->read = READING_U8; | |
1832 | chip->write = WRITING_U8; | |
bde435a9 | 1833 | } else if (bits <= 16) { |
b43d65f7 LW |
1834 | dev_dbg(&spi->dev, "9 <= n <= 16 bits per word\n"); |
1835 | chip->n_bytes = 2; | |
1836 | chip->read = READING_U16; | |
1837 | chip->write = WRITING_U16; | |
1838 | } else { | |
1839 | if (pl022->vendor->max_bpw >= 32) { | |
1840 | dev_dbg(&spi->dev, "17 <= n <= 32 bits per word\n"); | |
1841 | chip->n_bytes = 4; | |
1842 | chip->read = READING_U32; | |
1843 | chip->write = WRITING_U32; | |
1844 | } else { | |
1845 | dev_err(&spi->dev, | |
1846 | "illegal data size for this controller!\n"); | |
1847 | dev_err(&spi->dev, | |
1848 | "a standard pl022 can only handle " | |
1849 | "1 <= n <= 16 bit words\n"); | |
bde435a9 | 1850 | status = -ENOTSUPP; |
b43d65f7 LW |
1851 | goto err_config_params; |
1852 | } | |
1853 | } | |
1854 | ||
1855 | /* Now Initialize all register settings required for this chip */ | |
1856 | chip->cr0 = 0; | |
1857 | chip->cr1 = 0; | |
1858 | chip->dmacr = 0; | |
1859 | chip->cpsr = 0; | |
1860 | if ((chip_info->com_mode == DMA_TRANSFER) | |
1861 | && ((pl022->master_info)->enable_dma)) { | |
b1b6b9aa | 1862 | chip->enable_dma = true; |
b43d65f7 | 1863 | dev_dbg(&spi->dev, "DMA mode set in controller state\n"); |
b43d65f7 LW |
1864 | SSP_WRITE_BITS(chip->dmacr, SSP_DMA_ENABLED, |
1865 | SSP_DMACR_MASK_RXDMAE, 0); | |
1866 | SSP_WRITE_BITS(chip->dmacr, SSP_DMA_ENABLED, | |
1867 | SSP_DMACR_MASK_TXDMAE, 1); | |
1868 | } else { | |
b1b6b9aa | 1869 | chip->enable_dma = false; |
b43d65f7 LW |
1870 | dev_dbg(&spi->dev, "DMA mode NOT set in controller state\n"); |
1871 | SSP_WRITE_BITS(chip->dmacr, SSP_DMA_DISABLED, | |
1872 | SSP_DMACR_MASK_RXDMAE, 0); | |
1873 | SSP_WRITE_BITS(chip->dmacr, SSP_DMA_DISABLED, | |
1874 | SSP_DMACR_MASK_TXDMAE, 1); | |
1875 | } | |
1876 | ||
f9d629c7 | 1877 | chip->cpsr = clk_freq.cpsdvsr; |
b43d65f7 | 1878 | |
556f4aeb LW |
1879 | /* Special setup for the ST micro extended control registers */ |
1880 | if (pl022->vendor->extended_cr) { | |
bde435a9 KW |
1881 | u32 etx; |
1882 | ||
781c7b12 LW |
1883 | if (pl022->vendor->pl023) { |
1884 | /* These bits are only in the PL023 */ | |
1885 | SSP_WRITE_BITS(chip->cr1, chip_info->clkdelay, | |
1886 | SSP_CR1_MASK_FBCLKDEL_ST, 13); | |
1887 | } else { | |
1888 | /* These bits are in the PL022 but not PL023 */ | |
1889 | SSP_WRITE_BITS(chip->cr0, chip_info->duplex, | |
1890 | SSP_CR0_MASK_HALFDUP_ST, 5); | |
1891 | SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len, | |
1892 | SSP_CR0_MASK_CSS_ST, 16); | |
1893 | SSP_WRITE_BITS(chip->cr0, chip_info->iface, | |
1894 | SSP_CR0_MASK_FRF_ST, 21); | |
1895 | SSP_WRITE_BITS(chip->cr1, chip_info->wait_state, | |
1896 | SSP_CR1_MASK_MWAIT_ST, 6); | |
1897 | } | |
bde435a9 | 1898 | SSP_WRITE_BITS(chip->cr0, bits - 1, |
556f4aeb | 1899 | SSP_CR0_MASK_DSS_ST, 0); |
bde435a9 KW |
1900 | |
1901 | if (spi->mode & SPI_LSB_FIRST) { | |
1902 | tmp = SSP_RX_LSB; | |
1903 | etx = SSP_TX_LSB; | |
1904 | } else { | |
1905 | tmp = SSP_RX_MSB; | |
1906 | etx = SSP_TX_MSB; | |
1907 | } | |
1908 | SSP_WRITE_BITS(chip->cr1, tmp, SSP_CR1_MASK_RENDN_ST, 4); | |
1909 | SSP_WRITE_BITS(chip->cr1, etx, SSP_CR1_MASK_TENDN_ST, 5); | |
556f4aeb LW |
1910 | SSP_WRITE_BITS(chip->cr1, chip_info->rx_lev_trig, |
1911 | SSP_CR1_MASK_RXIFLSEL_ST, 7); | |
1912 | SSP_WRITE_BITS(chip->cr1, chip_info->tx_lev_trig, | |
1913 | SSP_CR1_MASK_TXIFLSEL_ST, 10); | |
1914 | } else { | |
bde435a9 | 1915 | SSP_WRITE_BITS(chip->cr0, bits - 1, |
556f4aeb LW |
1916 | SSP_CR0_MASK_DSS, 0); |
1917 | SSP_WRITE_BITS(chip->cr0, chip_info->iface, | |
1918 | SSP_CR0_MASK_FRF, 4); | |
1919 | } | |
bde435a9 | 1920 | |
556f4aeb | 1921 | /* Stuff that is common for all versions */ |
bde435a9 KW |
1922 | if (spi->mode & SPI_CPOL) |
1923 | tmp = SSP_CLK_POL_IDLE_HIGH; | |
1924 | else | |
1925 | tmp = SSP_CLK_POL_IDLE_LOW; | |
1926 | SSP_WRITE_BITS(chip->cr0, tmp, SSP_CR0_MASK_SPO, 6); | |
1927 | ||
1928 | if (spi->mode & SPI_CPHA) | |
1929 | tmp = SSP_CLK_SECOND_EDGE; | |
1930 | else | |
1931 | tmp = SSP_CLK_FIRST_EDGE; | |
1932 | SSP_WRITE_BITS(chip->cr0, tmp, SSP_CR0_MASK_SPH, 7); | |
1933 | ||
f9d629c7 | 1934 | SSP_WRITE_BITS(chip->cr0, clk_freq.scr, SSP_CR0_MASK_SCR, 8); |
781c7b12 | 1935 | /* Loopback is available on all versions except PL023 */ |
06fb01fd | 1936 | if (pl022->vendor->loopback) { |
bde435a9 KW |
1937 | if (spi->mode & SPI_LOOP) |
1938 | tmp = LOOPBACK_ENABLED; | |
1939 | else | |
1940 | tmp = LOOPBACK_DISABLED; | |
1941 | SSP_WRITE_BITS(chip->cr1, tmp, SSP_CR1_MASK_LBM, 0); | |
1942 | } | |
b43d65f7 LW |
1943 | SSP_WRITE_BITS(chip->cr1, SSP_DISABLED, SSP_CR1_MASK_SSE, 1); |
1944 | SSP_WRITE_BITS(chip->cr1, chip_info->hierarchy, SSP_CR1_MASK_MS, 2); | |
f1e45f86 VK |
1945 | SSP_WRITE_BITS(chip->cr1, chip_info->slave_tx_disable, SSP_CR1_MASK_SOD, |
1946 | 3); | |
b43d65f7 LW |
1947 | |
1948 | /* Save controller_state */ | |
1949 | spi_set_ctldata(spi, chip); | |
1950 | return status; | |
1951 | err_config_params: | |
bde435a9 | 1952 | spi_set_ctldata(spi, NULL); |
b43d65f7 LW |
1953 | kfree(chip); |
1954 | return status; | |
1955 | } | |
1956 | ||
1957 | /** | |
1958 | * pl022_cleanup - cleanup function registered to SPI master framework | |
1959 | * @spi: spi device which is requesting cleanup | |
1960 | * | |
1961 | * This function is registered to the SPI framework for this SPI master | |
1962 | * controller. It will free the runtime state of chip. | |
1963 | */ | |
1964 | static void pl022_cleanup(struct spi_device *spi) | |
1965 | { | |
1966 | struct chip_data *chip = spi_get_ctldata(spi); | |
1967 | ||
1968 | spi_set_ctldata(spi, NULL); | |
1969 | kfree(chip); | |
1970 | } | |
1971 | ||
b4225885 | 1972 | static int __devinit |
aa25afad | 1973 | pl022_probe(struct amba_device *adev, const struct amba_id *id) |
b43d65f7 LW |
1974 | { |
1975 | struct device *dev = &adev->dev; | |
1976 | struct pl022_ssp_controller *platform_info = adev->dev.platform_data; | |
1977 | struct spi_master *master; | |
1978 | struct pl022 *pl022 = NULL; /*Data for this driver */ | |
1979 | int status = 0; | |
1980 | ||
1981 | dev_info(&adev->dev, | |
1982 | "ARM PL022 driver, device ID: 0x%08x\n", adev->periphid); | |
1983 | if (platform_info == NULL) { | |
1984 | dev_err(&adev->dev, "probe - no platform data supplied\n"); | |
1985 | status = -ENODEV; | |
1986 | goto err_no_pdata; | |
1987 | } | |
1988 | ||
1989 | /* Allocate master with space for data */ | |
1990 | master = spi_alloc_master(dev, sizeof(struct pl022)); | |
1991 | if (master == NULL) { | |
1992 | dev_err(&adev->dev, "probe - cannot alloc SPI master\n"); | |
1993 | status = -ENOMEM; | |
1994 | goto err_no_master; | |
1995 | } | |
1996 | ||
1997 | pl022 = spi_master_get_devdata(master); | |
1998 | pl022->master = master; | |
1999 | pl022->master_info = platform_info; | |
2000 | pl022->adev = adev; | |
2001 | pl022->vendor = id->data; | |
2002 | ||
2003 | /* | |
2004 | * Bus Number Which has been Assigned to this SSP controller | |
2005 | * on this board | |
2006 | */ | |
2007 | master->bus_num = platform_info->bus_id; | |
2008 | master->num_chipselect = platform_info->num_chipselect; | |
2009 | master->cleanup = pl022_cleanup; | |
2010 | master->setup = pl022_setup; | |
ffbbdd21 LW |
2011 | master->prepare_transfer_hardware = pl022_prepare_transfer_hardware; |
2012 | master->transfer_one_message = pl022_transfer_one_message; | |
2013 | master->unprepare_transfer_hardware = pl022_unprepare_transfer_hardware; | |
2014 | master->rt = platform_info->rt; | |
b43d65f7 | 2015 | |
bde435a9 KW |
2016 | /* |
2017 | * Supports mode 0-3, loopback, and active low CS. Transfers are | |
2018 | * always MS bit first on the original pl022. | |
2019 | */ | |
2020 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP; | |
2021 | if (pl022->vendor->extended_cr) | |
2022 | master->mode_bits |= SPI_LSB_FIRST; | |
2023 | ||
b43d65f7 LW |
2024 | dev_dbg(&adev->dev, "BUSNO: %d\n", master->bus_num); |
2025 | ||
2026 | status = amba_request_regions(adev, NULL); | |
2027 | if (status) | |
2028 | goto err_no_ioregion; | |
2029 | ||
b1b6b9aa | 2030 | pl022->phybase = adev->res.start; |
b43d65f7 LW |
2031 | pl022->virtbase = ioremap(adev->res.start, resource_size(&adev->res)); |
2032 | if (pl022->virtbase == NULL) { | |
2033 | status = -ENOMEM; | |
2034 | goto err_no_ioremap; | |
2035 | } | |
2036 | printk(KERN_INFO "pl022: mapped registers from 0x%08x to %p\n", | |
2037 | adev->res.start, pl022->virtbase); | |
2038 | ||
2039 | pl022->clk = clk_get(&adev->dev, NULL); | |
2040 | if (IS_ERR(pl022->clk)) { | |
2041 | status = PTR_ERR(pl022->clk); | |
2042 | dev_err(&adev->dev, "could not retrieve SSP/SPI bus clock\n"); | |
2043 | goto err_no_clk; | |
2044 | } | |
7ff6bcf0 RK |
2045 | |
2046 | status = clk_prepare(pl022->clk); | |
2047 | if (status) { | |
2048 | dev_err(&adev->dev, "could not prepare SSP/SPI bus clock\n"); | |
2049 | goto err_clk_prep; | |
2050 | } | |
2051 | ||
71e63e74 UH |
2052 | status = clk_enable(pl022->clk); |
2053 | if (status) { | |
2054 | dev_err(&adev->dev, "could not enable SSP/SPI bus clock\n"); | |
2055 | goto err_no_clk_en; | |
2056 | } | |
2057 | ||
ffbbdd21 LW |
2058 | /* Initialize transfer pump */ |
2059 | tasklet_init(&pl022->pump_transfers, pump_transfers, | |
2060 | (unsigned long)pl022); | |
2061 | ||
b43d65f7 | 2062 | /* Disable SSP */ |
b43d65f7 LW |
2063 | writew((readw(SSP_CR1(pl022->virtbase)) & (~SSP_CR1_MASK_SSE)), |
2064 | SSP_CR1(pl022->virtbase)); | |
2065 | load_ssp_default_config(pl022); | |
b43d65f7 LW |
2066 | |
2067 | status = request_irq(adev->irq[0], pl022_interrupt_handler, 0, "pl022", | |
2068 | pl022); | |
2069 | if (status < 0) { | |
2070 | dev_err(&adev->dev, "probe - cannot get IRQ (%d)\n", status); | |
2071 | goto err_no_irq; | |
2072 | } | |
b1b6b9aa LW |
2073 | |
2074 | /* Get DMA channels */ | |
2075 | if (platform_info->enable_dma) { | |
2076 | status = pl022_dma_probe(pl022); | |
2077 | if (status != 0) | |
43c64015 | 2078 | platform_info->enable_dma = 0; |
b1b6b9aa LW |
2079 | } |
2080 | ||
b43d65f7 LW |
2081 | /* Register with the SPI framework */ |
2082 | amba_set_drvdata(adev, pl022); | |
2083 | status = spi_register_master(master); | |
2084 | if (status != 0) { | |
2085 | dev_err(&adev->dev, | |
2086 | "probe - problem registering spi master\n"); | |
2087 | goto err_spi_register; | |
2088 | } | |
25985edc | 2089 | dev_dbg(dev, "probe succeeded\n"); |
92b97f0a RK |
2090 | |
2091 | /* let runtime pm put suspend */ | |
53e4acea CB |
2092 | if (platform_info->autosuspend_delay > 0) { |
2093 | dev_info(&adev->dev, | |
2094 | "will use autosuspend for runtime pm, delay %dms\n", | |
2095 | platform_info->autosuspend_delay); | |
2096 | pm_runtime_set_autosuspend_delay(dev, | |
2097 | platform_info->autosuspend_delay); | |
2098 | pm_runtime_use_autosuspend(dev); | |
2099 | pm_runtime_put_autosuspend(dev); | |
2100 | } else { | |
2101 | pm_runtime_put(dev); | |
2102 | } | |
b43d65f7 LW |
2103 | return 0; |
2104 | ||
2105 | err_spi_register: | |
3e3ea716 VK |
2106 | if (platform_info->enable_dma) |
2107 | pl022_dma_remove(pl022); | |
2108 | ||
b43d65f7 LW |
2109 | free_irq(adev->irq[0], pl022); |
2110 | err_no_irq: | |
71e63e74 UH |
2111 | clk_disable(pl022->clk); |
2112 | err_no_clk_en: | |
7ff6bcf0 RK |
2113 | clk_unprepare(pl022->clk); |
2114 | err_clk_prep: | |
b43d65f7 LW |
2115 | clk_put(pl022->clk); |
2116 | err_no_clk: | |
2117 | iounmap(pl022->virtbase); | |
2118 | err_no_ioremap: | |
2119 | amba_release_regions(adev); | |
2120 | err_no_ioregion: | |
2121 | spi_master_put(master); | |
2122 | err_no_master: | |
2123 | err_no_pdata: | |
2124 | return status; | |
2125 | } | |
2126 | ||
b4225885 | 2127 | static int __devexit |
b43d65f7 LW |
2128 | pl022_remove(struct amba_device *adev) |
2129 | { | |
2130 | struct pl022 *pl022 = amba_get_drvdata(adev); | |
50658b66 | 2131 | |
b43d65f7 LW |
2132 | if (!pl022) |
2133 | return 0; | |
2134 | ||
92b97f0a RK |
2135 | /* |
2136 | * undo pm_runtime_put() in probe. I assume that we're not | |
2137 | * accessing the primecell here. | |
2138 | */ | |
2139 | pm_runtime_get_noresume(&adev->dev); | |
2140 | ||
b43d65f7 | 2141 | load_ssp_default_config(pl022); |
3e3ea716 VK |
2142 | if (pl022->master_info->enable_dma) |
2143 | pl022_dma_remove(pl022); | |
2144 | ||
b43d65f7 LW |
2145 | free_irq(adev->irq[0], pl022); |
2146 | clk_disable(pl022->clk); | |
7ff6bcf0 | 2147 | clk_unprepare(pl022->clk); |
b43d65f7 LW |
2148 | clk_put(pl022->clk); |
2149 | iounmap(pl022->virtbase); | |
2150 | amba_release_regions(adev); | |
2151 | tasklet_disable(&pl022->pump_transfers); | |
2152 | spi_unregister_master(pl022->master); | |
2153 | spi_master_put(pl022->master); | |
2154 | amba_set_drvdata(adev, NULL); | |
b43d65f7 LW |
2155 | return 0; |
2156 | } | |
2157 | ||
92b97f0a | 2158 | #ifdef CONFIG_SUSPEND |
6cfa6279 | 2159 | static int pl022_suspend(struct device *dev) |
b43d65f7 | 2160 | { |
92b97f0a | 2161 | struct pl022 *pl022 = dev_get_drvdata(dev); |
ffbbdd21 | 2162 | int ret; |
b43d65f7 | 2163 | |
ffbbdd21 LW |
2164 | ret = spi_master_suspend(pl022->master); |
2165 | if (ret) { | |
2166 | dev_warn(dev, "cannot suspend master\n"); | |
2167 | return ret; | |
b43d65f7 LW |
2168 | } |
2169 | ||
6cfa6279 | 2170 | dev_dbg(dev, "suspended\n"); |
b43d65f7 LW |
2171 | return 0; |
2172 | } | |
2173 | ||
92b97f0a | 2174 | static int pl022_resume(struct device *dev) |
b43d65f7 | 2175 | { |
92b97f0a | 2176 | struct pl022 *pl022 = dev_get_drvdata(dev); |
ffbbdd21 | 2177 | int ret; |
b43d65f7 LW |
2178 | |
2179 | /* Start the queue running */ | |
ffbbdd21 LW |
2180 | ret = spi_master_resume(pl022->master); |
2181 | if (ret) | |
2182 | dev_err(dev, "problem starting queue (%d)\n", ret); | |
b43d65f7 | 2183 | else |
92b97f0a | 2184 | dev_dbg(dev, "resumed\n"); |
b43d65f7 | 2185 | |
ffbbdd21 | 2186 | return ret; |
b43d65f7 | 2187 | } |
b43d65f7 LW |
2188 | #endif /* CONFIG_PM */ |
2189 | ||
92b97f0a RK |
2190 | #ifdef CONFIG_PM_RUNTIME |
2191 | static int pl022_runtime_suspend(struct device *dev) | |
2192 | { | |
2193 | struct pl022 *pl022 = dev_get_drvdata(dev); | |
2194 | ||
2195 | clk_disable(pl022->clk); | |
2196 | amba_vcore_disable(pl022->adev); | |
2197 | ||
2198 | return 0; | |
2199 | } | |
2200 | ||
2201 | static int pl022_runtime_resume(struct device *dev) | |
2202 | { | |
2203 | struct pl022 *pl022 = dev_get_drvdata(dev); | |
2204 | ||
2205 | amba_vcore_enable(pl022->adev); | |
2206 | clk_enable(pl022->clk); | |
2207 | ||
2208 | return 0; | |
2209 | } | |
2210 | #endif | |
2211 | ||
2212 | static const struct dev_pm_ops pl022_dev_pm_ops = { | |
2213 | SET_SYSTEM_SLEEP_PM_OPS(pl022_suspend, pl022_resume) | |
2214 | SET_RUNTIME_PM_OPS(pl022_runtime_suspend, pl022_runtime_resume, NULL) | |
2215 | }; | |
2216 | ||
b43d65f7 LW |
2217 | static struct vendor_data vendor_arm = { |
2218 | .fifodepth = 8, | |
2219 | .max_bpw = 16, | |
2220 | .unidir = false, | |
556f4aeb | 2221 | .extended_cr = false, |
781c7b12 | 2222 | .pl023 = false, |
06fb01fd | 2223 | .loopback = true, |
b43d65f7 LW |
2224 | }; |
2225 | ||
b43d65f7 LW |
2226 | static struct vendor_data vendor_st = { |
2227 | .fifodepth = 32, | |
2228 | .max_bpw = 32, | |
2229 | .unidir = false, | |
556f4aeb | 2230 | .extended_cr = true, |
781c7b12 | 2231 | .pl023 = false, |
06fb01fd | 2232 | .loopback = true, |
781c7b12 LW |
2233 | }; |
2234 | ||
2235 | static struct vendor_data vendor_st_pl023 = { | |
2236 | .fifodepth = 32, | |
2237 | .max_bpw = 32, | |
2238 | .unidir = false, | |
2239 | .extended_cr = true, | |
2240 | .pl023 = true, | |
06fb01fd PL |
2241 | .loopback = false, |
2242 | }; | |
2243 | ||
2244 | static struct vendor_data vendor_db5500_pl023 = { | |
2245 | .fifodepth = 32, | |
2246 | .max_bpw = 32, | |
2247 | .unidir = false, | |
2248 | .extended_cr = true, | |
2249 | .pl023 = true, | |
2250 | .loopback = true, | |
b43d65f7 LW |
2251 | }; |
2252 | ||
2253 | static struct amba_id pl022_ids[] = { | |
2254 | { | |
2255 | /* | |
2256 | * ARM PL022 variant, this has a 16bit wide | |
2257 | * and 8 locations deep TX/RX FIFO | |
2258 | */ | |
2259 | .id = 0x00041022, | |
2260 | .mask = 0x000fffff, | |
2261 | .data = &vendor_arm, | |
2262 | }, | |
2263 | { | |
2264 | /* | |
2265 | * ST Micro derivative, this has 32bit wide | |
2266 | * and 32 locations deep TX/RX FIFO | |
2267 | */ | |
e89e04fc | 2268 | .id = 0x01080022, |
b43d65f7 LW |
2269 | .mask = 0xffffffff, |
2270 | .data = &vendor_st, | |
2271 | }, | |
781c7b12 LW |
2272 | { |
2273 | /* | |
2274 | * ST-Ericsson derivative "PL023" (this is not | |
2275 | * an official ARM number), this is a PL022 SSP block | |
2276 | * stripped to SPI mode only, it has 32bit wide | |
2277 | * and 32 locations deep TX/RX FIFO but no extended | |
2278 | * CR0/CR1 register | |
2279 | */ | |
f1e45f86 VK |
2280 | .id = 0x00080023, |
2281 | .mask = 0xffffffff, | |
2282 | .data = &vendor_st_pl023, | |
781c7b12 | 2283 | }, |
06fb01fd PL |
2284 | { |
2285 | .id = 0x10080023, | |
2286 | .mask = 0xffffffff, | |
2287 | .data = &vendor_db5500_pl023, | |
2288 | }, | |
b43d65f7 LW |
2289 | { 0, 0 }, |
2290 | }; | |
2291 | ||
7eeac71b DM |
2292 | MODULE_DEVICE_TABLE(amba, pl022_ids); |
2293 | ||
b43d65f7 LW |
2294 | static struct amba_driver pl022_driver = { |
2295 | .drv = { | |
2296 | .name = "ssp-pl022", | |
92b97f0a | 2297 | .pm = &pl022_dev_pm_ops, |
b43d65f7 LW |
2298 | }, |
2299 | .id_table = pl022_ids, | |
2300 | .probe = pl022_probe, | |
b4225885 | 2301 | .remove = __devexit_p(pl022_remove), |
b43d65f7 LW |
2302 | }; |
2303 | ||
b43d65f7 LW |
2304 | static int __init pl022_init(void) |
2305 | { | |
2306 | return amba_driver_register(&pl022_driver); | |
2307 | } | |
25c8e03b | 2308 | subsys_initcall(pl022_init); |
b43d65f7 LW |
2309 | |
2310 | static void __exit pl022_exit(void) | |
2311 | { | |
2312 | amba_driver_unregister(&pl022_driver); | |
2313 | } | |
b43d65f7 LW |
2314 | module_exit(pl022_exit); |
2315 | ||
2316 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | |
2317 | MODULE_DESCRIPTION("PL022 SSP Controller Driver"); | |
2318 | MODULE_LICENSE("GPL"); |