Commit | Line | Data |
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e8b17b5b MO |
1 | /* |
2 | * SPI bus driver for the Topcliff PCH used by Intel SoCs | |
65308c46 | 3 | * |
2b246283 | 4 | * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd. |
e8b17b5b MO |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; version 2 of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
65308c46 | 20 | #include <linux/delay.h> |
e8b17b5b MO |
21 | #include <linux/pci.h> |
22 | #include <linux/wait.h> | |
23 | #include <linux/spi/spi.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/sched.h> | |
26 | #include <linux/spi/spidev.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/device.h> | |
f016aeb6 | 29 | #include <linux/platform_device.h> |
e8b17b5b | 30 | |
c37f3c27 TM |
31 | #include <linux/dmaengine.h> |
32 | #include <linux/pch_dma.h> | |
33 | ||
e8b17b5b MO |
34 | /* Register offsets */ |
35 | #define PCH_SPCR 0x00 /* SPI control register */ | |
36 | #define PCH_SPBRR 0x04 /* SPI baud rate register */ | |
37 | #define PCH_SPSR 0x08 /* SPI status register */ | |
38 | #define PCH_SPDWR 0x0C /* SPI write data register */ | |
39 | #define PCH_SPDRR 0x10 /* SPI read data register */ | |
40 | #define PCH_SSNXCR 0x18 /* SSN Expand Control Register */ | |
41 | #define PCH_SRST 0x1C /* SPI reset register */ | |
c37f3c27 | 42 | #define PCH_ADDRESS_SIZE 0x20 |
e8b17b5b MO |
43 | |
44 | #define PCH_SPSR_TFD 0x000007C0 | |
45 | #define PCH_SPSR_RFD 0x0000F800 | |
46 | ||
47 | #define PCH_READABLE(x) (((x) & PCH_SPSR_RFD)>>11) | |
48 | #define PCH_WRITABLE(x) (((x) & PCH_SPSR_TFD)>>6) | |
49 | ||
50 | #define PCH_RX_THOLD 7 | |
51 | #define PCH_RX_THOLD_MAX 15 | |
e8b17b5b | 52 | |
f3e03e2e TM |
53 | #define PCH_TX_THOLD 2 |
54 | ||
e8b17b5b MO |
55 | #define PCH_MAX_BAUDRATE 5000000 |
56 | #define PCH_MAX_FIFO_DEPTH 16 | |
57 | ||
58 | #define STATUS_RUNNING 1 | |
59 | #define STATUS_EXITING 2 | |
60 | #define PCH_SLEEP_TIME 10 | |
61 | ||
e8b17b5b | 62 | #define SSN_LOW 0x02U |
8b7aa961 | 63 | #define SSN_HIGH 0x03U |
e8b17b5b MO |
64 | #define SSN_NO_CONTROL 0x00U |
65 | #define PCH_MAX_CS 0xFF | |
66 | #define PCI_DEVICE_ID_GE_SPI 0x8816 | |
67 | ||
68 | #define SPCR_SPE_BIT (1 << 0) | |
69 | #define SPCR_MSTR_BIT (1 << 1) | |
70 | #define SPCR_LSBF_BIT (1 << 4) | |
71 | #define SPCR_CPHA_BIT (1 << 5) | |
72 | #define SPCR_CPOL_BIT (1 << 6) | |
73 | #define SPCR_TFIE_BIT (1 << 8) | |
74 | #define SPCR_RFIE_BIT (1 << 9) | |
75 | #define SPCR_FIE_BIT (1 << 10) | |
76 | #define SPCR_ORIE_BIT (1 << 11) | |
77 | #define SPCR_MDFIE_BIT (1 << 12) | |
78 | #define SPCR_FICLR_BIT (1 << 24) | |
79 | #define SPSR_TFI_BIT (1 << 0) | |
80 | #define SPSR_RFI_BIT (1 << 1) | |
81 | #define SPSR_FI_BIT (1 << 2) | |
c37f3c27 | 82 | #define SPSR_ORF_BIT (1 << 3) |
e8b17b5b MO |
83 | #define SPBRR_SIZE_BIT (1 << 10) |
84 | ||
f016aeb6 TM |
85 | #define PCH_ALL (SPCR_TFIE_BIT|SPCR_RFIE_BIT|SPCR_FIE_BIT|\ |
86 | SPCR_ORIE_BIT|SPCR_MDFIE_BIT) | |
65308c46 | 87 | |
e8b17b5b MO |
88 | #define SPCR_RFIC_FIELD 20 |
89 | #define SPCR_TFIC_FIELD 16 | |
90 | ||
c37f3c27 TM |
91 | #define MASK_SPBRR_SPBR_BITS ((1 << 10) - 1) |
92 | #define MASK_RFIC_SPCR_BITS (0xf << SPCR_RFIC_FIELD) | |
93 | #define MASK_TFIC_SPCR_BITS (0xf << SPCR_TFIC_FIELD) | |
e8b17b5b MO |
94 | |
95 | #define PCH_CLOCK_HZ 50000000 | |
96 | #define PCH_MAX_SPBR 1023 | |
97 | ||
2b246283 | 98 | /* Definition for ML7213/ML7223/ML7831 by LAPIS Semiconductor */ |
f016aeb6 TM |
99 | #define PCI_VENDOR_ID_ROHM 0x10DB |
100 | #define PCI_DEVICE_ID_ML7213_SPI 0x802c | |
2e2de2e3 | 101 | #define PCI_DEVICE_ID_ML7223_SPI 0x800F |
92b3a5c1 | 102 | #define PCI_DEVICE_ID_ML7831_SPI 0x8816 |
f016aeb6 TM |
103 | |
104 | /* | |
105 | * Set the number of SPI instance max | |
106 | * Intel EG20T PCH : 1ch | |
2b246283 TM |
107 | * LAPIS Semiconductor ML7213 IOH : 2ch |
108 | * LAPIS Semiconductor ML7223 IOH : 1ch | |
109 | * LAPIS Semiconductor ML7831 IOH : 1ch | |
f016aeb6 TM |
110 | */ |
111 | #define PCH_SPI_MAX_DEV 2 | |
e8b17b5b | 112 | |
c37f3c27 TM |
113 | #define PCH_BUF_SIZE 4096 |
114 | #define PCH_DMA_TRANS_SIZE 12 | |
115 | ||
116 | static int use_dma = 1; | |
117 | ||
118 | struct pch_spi_dma_ctrl { | |
119 | struct dma_async_tx_descriptor *desc_tx; | |
120 | struct dma_async_tx_descriptor *desc_rx; | |
121 | struct pch_dma_slave param_tx; | |
122 | struct pch_dma_slave param_rx; | |
123 | struct dma_chan *chan_tx; | |
124 | struct dma_chan *chan_rx; | |
125 | struct scatterlist *sg_tx_p; | |
126 | struct scatterlist *sg_rx_p; | |
127 | struct scatterlist sg_tx; | |
128 | struct scatterlist sg_rx; | |
129 | int nent; | |
130 | void *tx_buf_virt; | |
131 | void *rx_buf_virt; | |
132 | dma_addr_t tx_buf_dma; | |
133 | dma_addr_t rx_buf_dma; | |
134 | }; | |
e8b17b5b MO |
135 | /** |
136 | * struct pch_spi_data - Holds the SPI channel specific details | |
137 | * @io_remap_addr: The remapped PCI base address | |
138 | * @master: Pointer to the SPI master structure | |
139 | * @work: Reference to work queue handler | |
140 | * @wk: Workqueue for carrying out execution of the | |
141 | * requests | |
142 | * @wait: Wait queue for waking up upon receiving an | |
143 | * interrupt. | |
144 | * @transfer_complete: Status of SPI Transfer | |
145 | * @bcurrent_msg_processing: Status flag for message processing | |
146 | * @lock: Lock for protecting this structure | |
147 | * @queue: SPI Message queue | |
148 | * @status: Status of the SPI driver | |
149 | * @bpw_len: Length of data to be transferred in bits per | |
150 | * word | |
151 | * @transfer_active: Flag showing active transfer | |
152 | * @tx_index: Transmit data count; for bookkeeping during | |
153 | * transfer | |
154 | * @rx_index: Receive data count; for bookkeeping during | |
155 | * transfer | |
156 | * @tx_buff: Buffer for data to be transmitted | |
157 | * @rx_index: Buffer for Received data | |
158 | * @n_curnt_chip: The chip number that this SPI driver currently | |
159 | * operates on | |
160 | * @current_chip: Reference to the current chip that this SPI | |
161 | * driver currently operates on | |
162 | * @current_msg: The current message that this SPI driver is | |
163 | * handling | |
164 | * @cur_trans: The current transfer that this SPI driver is | |
165 | * handling | |
166 | * @board_dat: Reference to the SPI device data structure | |
f016aeb6 TM |
167 | * @plat_dev: platform_device structure |
168 | * @ch: SPI channel number | |
169 | * @irq_reg_sts: Status of IRQ registration | |
e8b17b5b MO |
170 | */ |
171 | struct pch_spi_data { | |
172 | void __iomem *io_remap_addr; | |
c37f3c27 | 173 | unsigned long io_base_addr; |
e8b17b5b MO |
174 | struct spi_master *master; |
175 | struct work_struct work; | |
176 | struct workqueue_struct *wk; | |
177 | wait_queue_head_t wait; | |
178 | u8 transfer_complete; | |
179 | u8 bcurrent_msg_processing; | |
180 | spinlock_t lock; | |
181 | struct list_head queue; | |
182 | u8 status; | |
183 | u32 bpw_len; | |
184 | u8 transfer_active; | |
185 | u32 tx_index; | |
186 | u32 rx_index; | |
187 | u16 *pkt_tx_buff; | |
188 | u16 *pkt_rx_buff; | |
189 | u8 n_curnt_chip; | |
190 | struct spi_device *current_chip; | |
191 | struct spi_message *current_msg; | |
192 | struct spi_transfer *cur_trans; | |
193 | struct pch_spi_board_data *board_dat; | |
f016aeb6 TM |
194 | struct platform_device *plat_dev; |
195 | int ch; | |
c37f3c27 TM |
196 | struct pch_spi_dma_ctrl dma; |
197 | int use_dma; | |
f016aeb6 | 198 | u8 irq_reg_sts; |
7d05b3e8 | 199 | int save_total_len; |
e8b17b5b MO |
200 | }; |
201 | ||
202 | /** | |
203 | * struct pch_spi_board_data - Holds the SPI device specific details | |
204 | * @pdev: Pointer to the PCI device | |
e8b17b5b | 205 | * @suspend_sts: Status of suspend |
f016aeb6 | 206 | * @num: The number of SPI device instance |
e8b17b5b MO |
207 | */ |
208 | struct pch_spi_board_data { | |
209 | struct pci_dev *pdev; | |
e8b17b5b | 210 | u8 suspend_sts; |
f016aeb6 TM |
211 | int num; |
212 | }; | |
213 | ||
214 | struct pch_pd_dev_save { | |
215 | int num; | |
216 | struct platform_device *pd_save[PCH_SPI_MAX_DEV]; | |
217 | struct pch_spi_board_data *board_dat; | |
e8b17b5b MO |
218 | }; |
219 | ||
e290cf27 | 220 | static DEFINE_PCI_DEVICE_TABLE(pch_spi_pcidev_id) = { |
f016aeb6 TM |
221 | { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_GE_SPI), 1, }, |
222 | { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_SPI), 2, }, | |
2e2de2e3 | 223 | { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_SPI), 1, }, |
92b3a5c1 | 224 | { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_SPI), 1, }, |
f016aeb6 | 225 | { } |
e8b17b5b MO |
226 | }; |
227 | ||
e8b17b5b MO |
228 | /** |
229 | * pch_spi_writereg() - Performs register writes | |
230 | * @master: Pointer to struct spi_master. | |
231 | * @idx: Register offset. | |
232 | * @val: Value to be written to register. | |
233 | */ | |
234 | static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val) | |
235 | { | |
e8b17b5b | 236 | struct pch_spi_data *data = spi_master_get_devdata(master); |
e8b17b5b MO |
237 | iowrite32(val, (data->io_remap_addr + idx)); |
238 | } | |
239 | ||
240 | /** | |
241 | * pch_spi_readreg() - Performs register reads | |
242 | * @master: Pointer to struct spi_master. | |
243 | * @idx: Register offset. | |
244 | */ | |
245 | static inline u32 pch_spi_readreg(struct spi_master *master, int idx) | |
246 | { | |
247 | struct pch_spi_data *data = spi_master_get_devdata(master); | |
e8b17b5b MO |
248 | return ioread32(data->io_remap_addr + idx); |
249 | } | |
250 | ||
e8b17b5b MO |
251 | static inline void pch_spi_setclr_reg(struct spi_master *master, int idx, |
252 | u32 set, u32 clr) | |
253 | { | |
254 | u32 tmp = pch_spi_readreg(master, idx); | |
255 | tmp = (tmp & ~clr) | set; | |
256 | pch_spi_writereg(master, idx, tmp); | |
257 | } | |
258 | ||
e8b17b5b MO |
259 | static void pch_spi_set_master_mode(struct spi_master *master) |
260 | { | |
261 | pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MSTR_BIT, 0); | |
262 | } | |
263 | ||
264 | /** | |
265 | * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs | |
266 | * @master: Pointer to struct spi_master. | |
267 | */ | |
268 | static void pch_spi_clear_fifo(struct spi_master *master) | |
269 | { | |
270 | pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FICLR_BIT, 0); | |
271 | pch_spi_setclr_reg(master, PCH_SPCR, 0, SPCR_FICLR_BIT); | |
272 | } | |
273 | ||
e8b17b5b MO |
274 | static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val, |
275 | void __iomem *io_remap_addr) | |
276 | { | |
277 | u32 n_read, tx_index, rx_index, bpw_len; | |
278 | u16 *pkt_rx_buffer, *pkt_tx_buff; | |
279 | int read_cnt; | |
280 | u32 reg_spcr_val; | |
281 | void __iomem *spsr; | |
282 | void __iomem *spdrr; | |
283 | void __iomem *spdwr; | |
284 | ||
285 | spsr = io_remap_addr + PCH_SPSR; | |
286 | iowrite32(reg_spsr_val, spsr); | |
287 | ||
288 | if (data->transfer_active) { | |
289 | rx_index = data->rx_index; | |
290 | tx_index = data->tx_index; | |
291 | bpw_len = data->bpw_len; | |
292 | pkt_rx_buffer = data->pkt_rx_buff; | |
293 | pkt_tx_buff = data->pkt_tx_buff; | |
294 | ||
295 | spdrr = io_remap_addr + PCH_SPDRR; | |
296 | spdwr = io_remap_addr + PCH_SPDWR; | |
297 | ||
298 | n_read = PCH_READABLE(reg_spsr_val); | |
299 | ||
300 | for (read_cnt = 0; (read_cnt < n_read); read_cnt++) { | |
301 | pkt_rx_buffer[rx_index++] = ioread32(spdrr); | |
302 | if (tx_index < bpw_len) | |
303 | iowrite32(pkt_tx_buff[tx_index++], spdwr); | |
304 | } | |
305 | ||
306 | /* disable RFI if not needed */ | |
307 | if ((bpw_len - rx_index) <= PCH_MAX_FIFO_DEPTH) { | |
308 | reg_spcr_val = ioread32(io_remap_addr + PCH_SPCR); | |
65308c46 | 309 | reg_spcr_val &= ~SPCR_RFIE_BIT; /* disable RFI */ |
e8b17b5b MO |
310 | |
311 | /* reset rx threshold */ | |
c37f3c27 | 312 | reg_spcr_val &= ~MASK_RFIC_SPCR_BITS; |
e8b17b5b | 313 | reg_spcr_val |= (PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD); |
c37f3c27 TM |
314 | |
315 | iowrite32(reg_spcr_val, (io_remap_addr + PCH_SPCR)); | |
e8b17b5b MO |
316 | } |
317 | ||
318 | /* update counts */ | |
319 | data->tx_index = tx_index; | |
320 | data->rx_index = rx_index; | |
321 | ||
de3bd7e6 DK |
322 | /* if transfer complete interrupt */ |
323 | if (reg_spsr_val & SPSR_FI_BIT) { | |
324 | if ((tx_index == bpw_len) && (rx_index == tx_index)) { | |
325 | /* disable interrupts */ | |
326 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, | |
327 | PCH_ALL); | |
328 | ||
329 | /* transfer is completed; | |
330 | inform pch_spi_process_messages */ | |
331 | data->transfer_complete = true; | |
332 | data->transfer_active = false; | |
333 | wake_up(&data->wait); | |
334 | } else { | |
335 | dev_err(&data->master->dev, | |
336 | "%s : Transfer is not completed", | |
337 | __func__); | |
338 | } | |
373b0eb6 | 339 | } |
e8b17b5b MO |
340 | } |
341 | } | |
342 | ||
e8b17b5b MO |
343 | /** |
344 | * pch_spi_handler() - Interrupt handler | |
345 | * @irq: The interrupt number. | |
346 | * @dev_id: Pointer to struct pch_spi_board_data. | |
347 | */ | |
348 | static irqreturn_t pch_spi_handler(int irq, void *dev_id) | |
349 | { | |
350 | u32 reg_spsr_val; | |
e8b17b5b MO |
351 | void __iomem *spsr; |
352 | void __iomem *io_remap_addr; | |
353 | irqreturn_t ret = IRQ_NONE; | |
f016aeb6 TM |
354 | struct pch_spi_data *data = dev_id; |
355 | struct pch_spi_board_data *board_dat = data->board_dat; | |
e8b17b5b MO |
356 | |
357 | if (board_dat->suspend_sts) { | |
358 | dev_dbg(&board_dat->pdev->dev, | |
359 | "%s returning due to suspend\n", __func__); | |
360 | return IRQ_NONE; | |
361 | } | |
362 | ||
e8b17b5b MO |
363 | io_remap_addr = data->io_remap_addr; |
364 | spsr = io_remap_addr + PCH_SPSR; | |
365 | ||
366 | reg_spsr_val = ioread32(spsr); | |
367 | ||
25e803f9 TM |
368 | if (reg_spsr_val & SPSR_ORF_BIT) { |
369 | dev_err(&board_dat->pdev->dev, "%s Over run error\n", __func__); | |
370 | if (data->current_msg->complete != 0) { | |
371 | data->transfer_complete = true; | |
372 | data->current_msg->status = -EIO; | |
373 | data->current_msg->complete(data->current_msg->context); | |
374 | data->bcurrent_msg_processing = false; | |
375 | data->current_msg = NULL; | |
376 | data->cur_trans = NULL; | |
377 | } | |
378 | } | |
379 | ||
380 | if (data->use_dma) | |
381 | return IRQ_NONE; | |
c37f3c27 | 382 | |
e8b17b5b | 383 | /* Check if the interrupt is for SPI device */ |
e8b17b5b MO |
384 | if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) { |
385 | pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr); | |
386 | ret = IRQ_HANDLED; | |
387 | } | |
388 | ||
389 | dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n", | |
390 | __func__, ret); | |
391 | ||
392 | return ret; | |
393 | } | |
394 | ||
395 | /** | |
396 | * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR | |
397 | * @master: Pointer to struct spi_master. | |
398 | * @speed_hz: Baud rate. | |
399 | */ | |
400 | static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz) | |
401 | { | |
65308c46 | 402 | u32 n_spbr = PCH_CLOCK_HZ / (speed_hz * 2); |
e8b17b5b MO |
403 | |
404 | /* if baud rate is less than we can support limit it */ | |
e8b17b5b MO |
405 | if (n_spbr > PCH_MAX_SPBR) |
406 | n_spbr = PCH_MAX_SPBR; | |
407 | ||
c37f3c27 | 408 | pch_spi_setclr_reg(master, PCH_SPBRR, n_spbr, MASK_SPBRR_SPBR_BITS); |
e8b17b5b MO |
409 | } |
410 | ||
411 | /** | |
412 | * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR | |
413 | * @master: Pointer to struct spi_master. | |
414 | * @bits_per_word: Bits per word for SPI transfer. | |
415 | */ | |
416 | static void pch_spi_set_bits_per_word(struct spi_master *master, | |
417 | u8 bits_per_word) | |
418 | { | |
419 | if (bits_per_word == 8) | |
420 | pch_spi_setclr_reg(master, PCH_SPBRR, 0, SPBRR_SIZE_BIT); | |
421 | else | |
422 | pch_spi_setclr_reg(master, PCH_SPBRR, SPBRR_SIZE_BIT, 0); | |
423 | } | |
424 | ||
425 | /** | |
426 | * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer | |
427 | * @spi: Pointer to struct spi_device. | |
428 | */ | |
429 | static void pch_spi_setup_transfer(struct spi_device *spi) | |
430 | { | |
65308c46 | 431 | u32 flags = 0; |
e8b17b5b MO |
432 | |
433 | dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n", | |
434 | __func__, pch_spi_readreg(spi->master, PCH_SPBRR), | |
435 | spi->max_speed_hz); | |
e8b17b5b MO |
436 | pch_spi_set_baud_rate(spi->master, spi->max_speed_hz); |
437 | ||
438 | /* set bits per word */ | |
439 | pch_spi_set_bits_per_word(spi->master, spi->bits_per_word); | |
440 | ||
65308c46 GL |
441 | if (!(spi->mode & SPI_LSB_FIRST)) |
442 | flags |= SPCR_LSBF_BIT; | |
e8b17b5b | 443 | if (spi->mode & SPI_CPOL) |
65308c46 | 444 | flags |= SPCR_CPOL_BIT; |
e8b17b5b | 445 | if (spi->mode & SPI_CPHA) |
65308c46 GL |
446 | flags |= SPCR_CPHA_BIT; |
447 | pch_spi_setclr_reg(spi->master, PCH_SPCR, flags, | |
448 | (SPCR_LSBF_BIT | SPCR_CPOL_BIT | SPCR_CPHA_BIT)); | |
e8b17b5b MO |
449 | |
450 | /* Clear the FIFO by toggling FICLR to 1 and back to 0 */ | |
451 | pch_spi_clear_fifo(spi->master); | |
452 | } | |
453 | ||
e8b17b5b MO |
454 | /** |
455 | * pch_spi_reset() - Clears SPI registers | |
456 | * @master: Pointer to struct spi_master. | |
457 | */ | |
458 | static void pch_spi_reset(struct spi_master *master) | |
459 | { | |
460 | /* write 1 to reset SPI */ | |
461 | pch_spi_writereg(master, PCH_SRST, 0x1); | |
462 | ||
463 | /* clear reset */ | |
464 | pch_spi_writereg(master, PCH_SRST, 0x0); | |
465 | } | |
466 | ||
467 | static int pch_spi_setup(struct spi_device *pspi) | |
468 | { | |
469 | /* check bits per word */ | |
65308c46 | 470 | if (pspi->bits_per_word == 0) { |
e8b17b5b MO |
471 | pspi->bits_per_word = 8; |
472 | dev_dbg(&pspi->dev, "%s 8 bits per word\n", __func__); | |
473 | } | |
474 | ||
65308c46 | 475 | if ((pspi->bits_per_word != 8) && (pspi->bits_per_word != 16)) { |
e8b17b5b MO |
476 | dev_err(&pspi->dev, "%s Invalid bits per word\n", __func__); |
477 | return -EINVAL; | |
478 | } | |
479 | ||
480 | /* Check baud rate setting */ | |
481 | /* if baud rate of chip is greater than | |
482 | max we can support,return error */ | |
483 | if ((pspi->max_speed_hz) > PCH_MAX_BAUDRATE) | |
484 | pspi->max_speed_hz = PCH_MAX_BAUDRATE; | |
485 | ||
486 | dev_dbg(&pspi->dev, "%s MODE = %x\n", __func__, | |
65308c46 | 487 | (pspi->mode) & (SPI_CPOL | SPI_CPHA)); |
e8b17b5b MO |
488 | |
489 | return 0; | |
490 | } | |
491 | ||
492 | static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg) | |
493 | { | |
494 | ||
495 | struct spi_transfer *transfer; | |
496 | struct pch_spi_data *data = spi_master_get_devdata(pspi->master); | |
497 | int retval; | |
498 | unsigned long flags; | |
499 | ||
500 | /* validate spi message and baud rate */ | |
65308c46 GL |
501 | if (unlikely(list_empty(&pmsg->transfers) == 1)) { |
502 | dev_err(&pspi->dev, "%s list empty\n", __func__); | |
503 | retval = -EINVAL; | |
504 | goto err_out; | |
505 | } | |
e8b17b5b | 506 | |
65308c46 GL |
507 | if (unlikely(pspi->max_speed_hz == 0)) { |
508 | dev_err(&pspi->dev, "%s pch_spi_tranfer maxspeed=%d\n", | |
509 | __func__, pspi->max_speed_hz); | |
e8b17b5b MO |
510 | retval = -EINVAL; |
511 | goto err_out; | |
512 | } | |
513 | ||
514 | dev_dbg(&pspi->dev, "%s Transfer List not empty. " | |
515 | "Transfer Speed is set.\n", __func__); | |
516 | ||
c37f3c27 | 517 | spin_lock_irqsave(&data->lock, flags); |
e8b17b5b MO |
518 | /* validate Tx/Rx buffers and Transfer length */ |
519 | list_for_each_entry(transfer, &pmsg->transfers, transfer_list) { | |
65308c46 | 520 | if (!transfer->tx_buf && !transfer->rx_buf) { |
e8b17b5b MO |
521 | dev_err(&pspi->dev, |
522 | "%s Tx and Rx buffer NULL\n", __func__); | |
523 | retval = -EINVAL; | |
c37f3c27 | 524 | goto err_return_spinlock; |
e8b17b5b MO |
525 | } |
526 | ||
65308c46 | 527 | if (!transfer->len) { |
e8b17b5b MO |
528 | dev_err(&pspi->dev, "%s Transfer length invalid\n", |
529 | __func__); | |
530 | retval = -EINVAL; | |
c37f3c27 | 531 | goto err_return_spinlock; |
e8b17b5b MO |
532 | } |
533 | ||
534 | dev_dbg(&pspi->dev, "%s Tx/Rx buffer valid. Transfer length" | |
535 | " valid\n", __func__); | |
536 | ||
c37f3c27 | 537 | /* if baud rate has been specified validate the same */ |
65308c46 GL |
538 | if (transfer->speed_hz > PCH_MAX_BAUDRATE) |
539 | transfer->speed_hz = PCH_MAX_BAUDRATE; | |
e8b17b5b MO |
540 | |
541 | /* if bits per word has been specified validate the same */ | |
542 | if (transfer->bits_per_word) { | |
543 | if ((transfer->bits_per_word != 8) | |
544 | && (transfer->bits_per_word != 16)) { | |
545 | retval = -EINVAL; | |
546 | dev_err(&pspi->dev, | |
547 | "%s Invalid bits per word\n", __func__); | |
c37f3c27 | 548 | goto err_return_spinlock; |
e8b17b5b MO |
549 | } |
550 | } | |
551 | } | |
c37f3c27 | 552 | spin_unlock_irqrestore(&data->lock, flags); |
e8b17b5b | 553 | |
65308c46 GL |
554 | /* We won't process any messages if we have been asked to terminate */ |
555 | if (data->status == STATUS_EXITING) { | |
e8b17b5b MO |
556 | dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__); |
557 | retval = -ESHUTDOWN; | |
c37f3c27 | 558 | goto err_out; |
e8b17b5b MO |
559 | } |
560 | ||
561 | /* If suspended ,return -EINVAL */ | |
562 | if (data->board_dat->suspend_sts) { | |
65308c46 | 563 | dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__); |
e8b17b5b | 564 | retval = -EINVAL; |
c37f3c27 | 565 | goto err_out; |
e8b17b5b MO |
566 | } |
567 | ||
568 | /* set status of message */ | |
569 | pmsg->actual_length = 0; | |
e8b17b5b MO |
570 | dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status); |
571 | ||
572 | pmsg->status = -EINPROGRESS; | |
c37f3c27 | 573 | spin_lock_irqsave(&data->lock, flags); |
e8b17b5b MO |
574 | /* add message to queue */ |
575 | list_add_tail(&pmsg->queue, &data->queue); | |
c37f3c27 TM |
576 | spin_unlock_irqrestore(&data->lock, flags); |
577 | ||
e8b17b5b MO |
578 | dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__); |
579 | ||
580 | /* schedule work queue to run */ | |
581 | queue_work(data->wk, &data->work); | |
e8b17b5b MO |
582 | dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__); |
583 | ||
584 | retval = 0; | |
585 | ||
e8b17b5b MO |
586 | err_out: |
587 | dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); | |
588 | return retval; | |
c37f3c27 TM |
589 | err_return_spinlock: |
590 | dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); | |
591 | spin_unlock_irqrestore(&data->lock, flags); | |
592 | return retval; | |
e8b17b5b MO |
593 | } |
594 | ||
595 | static inline void pch_spi_select_chip(struct pch_spi_data *data, | |
596 | struct spi_device *pspi) | |
597 | { | |
65308c46 GL |
598 | if (data->current_chip != NULL) { |
599 | if (pspi->chip_select != data->n_curnt_chip) { | |
600 | dev_dbg(&pspi->dev, "%s : different slave\n", __func__); | |
e8b17b5b MO |
601 | data->current_chip = NULL; |
602 | } | |
603 | } | |
604 | ||
605 | data->current_chip = pspi; | |
606 | ||
607 | data->n_curnt_chip = data->current_chip->chip_select; | |
608 | ||
609 | dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__); | |
610 | pch_spi_setup_transfer(pspi); | |
611 | } | |
612 | ||
c37f3c27 | 613 | static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw) |
e8b17b5b | 614 | { |
e8b17b5b MO |
615 | int size; |
616 | u32 n_writes; | |
617 | int j; | |
618 | struct spi_message *pmsg; | |
619 | const u8 *tx_buf; | |
620 | const u16 *tx_sbuf; | |
621 | ||
e8b17b5b MO |
622 | /* set baud rate if needed */ |
623 | if (data->cur_trans->speed_hz) { | |
65308c46 GL |
624 | dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__); |
625 | pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz); | |
e8b17b5b MO |
626 | } |
627 | ||
628 | /* set bits per word if needed */ | |
65308c46 GL |
629 | if (data->cur_trans->bits_per_word && |
630 | (data->current_msg->spi->bits_per_word != data->cur_trans->bits_per_word)) { | |
631 | dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__); | |
e8b17b5b | 632 | pch_spi_set_bits_per_word(data->master, |
65308c46 | 633 | data->cur_trans->bits_per_word); |
e8b17b5b MO |
634 | *bpw = data->cur_trans->bits_per_word; |
635 | } else { | |
636 | *bpw = data->current_msg->spi->bits_per_word; | |
637 | } | |
638 | ||
639 | /* reset Tx/Rx index */ | |
640 | data->tx_index = 0; | |
641 | data->rx_index = 0; | |
642 | ||
643 | data->bpw_len = data->cur_trans->len / (*bpw / 8); | |
e8b17b5b MO |
644 | |
645 | /* find alloc size */ | |
65308c46 GL |
646 | size = data->cur_trans->len * sizeof(*data->pkt_tx_buff); |
647 | ||
e8b17b5b MO |
648 | /* allocate memory for pkt_tx_buff & pkt_rx_buffer */ |
649 | data->pkt_tx_buff = kzalloc(size, GFP_KERNEL); | |
e8b17b5b MO |
650 | if (data->pkt_tx_buff != NULL) { |
651 | data->pkt_rx_buff = kzalloc(size, GFP_KERNEL); | |
65308c46 | 652 | if (!data->pkt_rx_buff) |
e8b17b5b | 653 | kfree(data->pkt_tx_buff); |
e8b17b5b MO |
654 | } |
655 | ||
65308c46 | 656 | if (!data->pkt_rx_buff) { |
e8b17b5b | 657 | /* flush queue and set status of all transfers to -ENOMEM */ |
65308c46 | 658 | dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__); |
e8b17b5b MO |
659 | list_for_each_entry(pmsg, data->queue.next, queue) { |
660 | pmsg->status = -ENOMEM; | |
661 | ||
662 | if (pmsg->complete != 0) | |
663 | pmsg->complete(pmsg->context); | |
664 | ||
665 | /* delete from queue */ | |
666 | list_del_init(&pmsg->queue); | |
667 | } | |
e8b17b5b MO |
668 | return; |
669 | } | |
670 | ||
671 | /* copy Tx Data */ | |
65308c46 | 672 | if (data->cur_trans->tx_buf != NULL) { |
e8b17b5b | 673 | if (*bpw == 8) { |
65308c46 GL |
674 | tx_buf = data->cur_trans->tx_buf; |
675 | for (j = 0; j < data->bpw_len; j++) | |
676 | data->pkt_tx_buff[j] = *tx_buf++; | |
e8b17b5b | 677 | } else { |
65308c46 GL |
678 | tx_sbuf = data->cur_trans->tx_buf; |
679 | for (j = 0; j < data->bpw_len; j++) | |
680 | data->pkt_tx_buff[j] = *tx_sbuf++; | |
e8b17b5b MO |
681 | } |
682 | } | |
683 | ||
684 | /* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */ | |
65308c46 GL |
685 | n_writes = data->bpw_len; |
686 | if (n_writes > PCH_MAX_FIFO_DEPTH) | |
e8b17b5b | 687 | n_writes = PCH_MAX_FIFO_DEPTH; |
e8b17b5b | 688 | |
65308c46 | 689 | dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing " |
e8b17b5b MO |
690 | "0x2 to SSNXCR\n", __func__); |
691 | pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW); | |
692 | ||
65308c46 GL |
693 | for (j = 0; j < n_writes; j++) |
694 | pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]); | |
e8b17b5b MO |
695 | |
696 | /* update tx_index */ | |
697 | data->tx_index = j; | |
698 | ||
699 | /* reset transfer complete flag */ | |
700 | data->transfer_complete = false; | |
701 | data->transfer_active = true; | |
702 | } | |
703 | ||
c37f3c27 | 704 | static void pch_spi_nomore_transfer(struct pch_spi_data *data) |
e8b17b5b | 705 | { |
c37f3c27 | 706 | struct spi_message *pmsg; |
65308c46 | 707 | dev_dbg(&data->master->dev, "%s called\n", __func__); |
e8b17b5b | 708 | /* Invoke complete callback |
65308c46 | 709 | * [To the spi core..indicating end of transfer] */ |
e8b17b5b MO |
710 | data->current_msg->status = 0; |
711 | ||
65308c46 | 712 | if (data->current_msg->complete != 0) { |
e8b17b5b MO |
713 | dev_dbg(&data->master->dev, |
714 | "%s:Invoking callback of SPI core\n", __func__); | |
715 | data->current_msg->complete(data->current_msg->context); | |
716 | } | |
717 | ||
718 | /* update status in global variable */ | |
719 | data->bcurrent_msg_processing = false; | |
720 | ||
721 | dev_dbg(&data->master->dev, | |
722 | "%s:data->bcurrent_msg_processing = false\n", __func__); | |
723 | ||
724 | data->current_msg = NULL; | |
725 | data->cur_trans = NULL; | |
726 | ||
65308c46 GL |
727 | /* check if we have items in list and not suspending |
728 | * return 1 if list empty */ | |
e8b17b5b | 729 | if ((list_empty(&data->queue) == 0) && |
65308c46 GL |
730 | (!data->board_dat->suspend_sts) && |
731 | (data->status != STATUS_EXITING)) { | |
e8b17b5b | 732 | /* We have some more work to do (either there is more tranint |
65308c46 GL |
733 | * bpw;sfer requests in the current message or there are |
734 | *more messages) | |
735 | */ | |
736 | dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__); | |
e8b17b5b | 737 | queue_work(data->wk, &data->work); |
65308c46 GL |
738 | } else if (data->board_dat->suspend_sts || |
739 | data->status == STATUS_EXITING) { | |
e8b17b5b MO |
740 | dev_dbg(&data->master->dev, |
741 | "%s suspend/remove initiated, flushing queue\n", | |
742 | __func__); | |
743 | list_for_each_entry(pmsg, data->queue.next, queue) { | |
744 | pmsg->status = -EIO; | |
745 | ||
65308c46 | 746 | if (pmsg->complete) |
e8b17b5b MO |
747 | pmsg->complete(pmsg->context); |
748 | ||
749 | /* delete from queue */ | |
750 | list_del_init(&pmsg->queue); | |
751 | } | |
752 | } | |
753 | } | |
754 | ||
755 | static void pch_spi_set_ir(struct pch_spi_data *data) | |
756 | { | |
c37f3c27 TM |
757 | /* enable interrupts, set threshold, enable SPI */ |
758 | if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH) | |
77e58efd | 759 | /* set receive threshold to PCH_RX_THOLD */ |
65308c46 | 760 | pch_spi_setclr_reg(data->master, PCH_SPCR, |
c37f3c27 TM |
761 | PCH_RX_THOLD << SPCR_RFIC_FIELD | |
762 | SPCR_FIE_BIT | SPCR_RFIE_BIT | | |
763 | SPCR_ORIE_BIT | SPCR_SPE_BIT, | |
764 | MASK_RFIC_SPCR_BITS | PCH_ALL); | |
765 | else | |
77e58efd | 766 | /* set receive threshold to maximum */ |
65308c46 | 767 | pch_spi_setclr_reg(data->master, PCH_SPCR, |
c37f3c27 TM |
768 | PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD | |
769 | SPCR_FIE_BIT | SPCR_ORIE_BIT | | |
770 | SPCR_SPE_BIT, | |
771 | MASK_RFIC_SPCR_BITS | PCH_ALL); | |
e8b17b5b MO |
772 | |
773 | /* Wait until the transfer completes; go to sleep after | |
774 | initiating the transfer. */ | |
775 | dev_dbg(&data->master->dev, | |
776 | "%s:waiting for transfer to get over\n", __func__); | |
777 | ||
778 | wait_event_interruptible(data->wait, data->transfer_complete); | |
779 | ||
e8b17b5b MO |
780 | /* clear all interrupts */ |
781 | pch_spi_writereg(data->master, PCH_SPSR, | |
65308c46 | 782 | pch_spi_readreg(data->master, PCH_SPSR)); |
c37f3c27 TM |
783 | /* Disable interrupts and SPI transfer */ |
784 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL | SPCR_SPE_BIT); | |
785 | /* clear FIFO */ | |
786 | pch_spi_clear_fifo(data->master); | |
e8b17b5b MO |
787 | } |
788 | ||
789 | static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw) | |
790 | { | |
791 | int j; | |
792 | u8 *rx_buf; | |
793 | u16 *rx_sbuf; | |
794 | ||
795 | /* copy Rx Data */ | |
65308c46 | 796 | if (!data->cur_trans->rx_buf) |
e8b17b5b MO |
797 | return; |
798 | ||
799 | if (bpw == 8) { | |
65308c46 GL |
800 | rx_buf = data->cur_trans->rx_buf; |
801 | for (j = 0; j < data->bpw_len; j++) | |
802 | *rx_buf++ = data->pkt_rx_buff[j] & 0xFF; | |
e8b17b5b | 803 | } else { |
65308c46 GL |
804 | rx_sbuf = data->cur_trans->rx_buf; |
805 | for (j = 0; j < data->bpw_len; j++) | |
806 | *rx_sbuf++ = data->pkt_rx_buff[j]; | |
e8b17b5b MO |
807 | } |
808 | } | |
809 | ||
c37f3c27 TM |
810 | static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw) |
811 | { | |
812 | int j; | |
813 | u8 *rx_buf; | |
814 | u16 *rx_sbuf; | |
815 | const u8 *rx_dma_buf; | |
816 | const u16 *rx_dma_sbuf; | |
817 | ||
818 | /* copy Rx Data */ | |
819 | if (!data->cur_trans->rx_buf) | |
820 | return; | |
821 | ||
822 | if (bpw == 8) { | |
823 | rx_buf = data->cur_trans->rx_buf; | |
824 | rx_dma_buf = data->dma.rx_buf_virt; | |
825 | for (j = 0; j < data->bpw_len; j++) | |
826 | *rx_buf++ = *rx_dma_buf++ & 0xFF; | |
7d05b3e8 | 827 | data->cur_trans->rx_buf = rx_buf; |
c37f3c27 TM |
828 | } else { |
829 | rx_sbuf = data->cur_trans->rx_buf; | |
830 | rx_dma_sbuf = data->dma.rx_buf_virt; | |
831 | for (j = 0; j < data->bpw_len; j++) | |
832 | *rx_sbuf++ = *rx_dma_sbuf++; | |
7d05b3e8 | 833 | data->cur_trans->rx_buf = rx_sbuf; |
c37f3c27 TM |
834 | } |
835 | } | |
836 | ||
25e803f9 | 837 | static int pch_spi_start_transfer(struct pch_spi_data *data) |
c37f3c27 TM |
838 | { |
839 | struct pch_spi_dma_ctrl *dma; | |
840 | unsigned long flags; | |
25e803f9 | 841 | int rtn; |
c37f3c27 TM |
842 | |
843 | dma = &data->dma; | |
844 | ||
845 | spin_lock_irqsave(&data->lock, flags); | |
846 | ||
847 | /* disable interrupts, SPI set enable */ | |
848 | pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_SPE_BIT, PCH_ALL); | |
849 | ||
850 | spin_unlock_irqrestore(&data->lock, flags); | |
851 | ||
852 | /* Wait until the transfer completes; go to sleep after | |
853 | initiating the transfer. */ | |
854 | dev_dbg(&data->master->dev, | |
855 | "%s:waiting for transfer to get over\n", __func__); | |
25e803f9 TM |
856 | rtn = wait_event_interruptible_timeout(data->wait, |
857 | data->transfer_complete, | |
858 | msecs_to_jiffies(2 * HZ)); | |
7d05b3e8 TM |
859 | if (!rtn) |
860 | dev_err(&data->master->dev, | |
861 | "%s wait-event timeout\n", __func__); | |
c37f3c27 TM |
862 | |
863 | dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent, | |
864 | DMA_FROM_DEVICE); | |
27504be5 TM |
865 | |
866 | dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent, | |
867 | DMA_FROM_DEVICE); | |
868 | memset(data->dma.tx_buf_virt, 0, PAGE_SIZE); | |
869 | ||
c37f3c27 TM |
870 | async_tx_ack(dma->desc_rx); |
871 | async_tx_ack(dma->desc_tx); | |
872 | kfree(dma->sg_tx_p); | |
873 | kfree(dma->sg_rx_p); | |
874 | ||
875 | spin_lock_irqsave(&data->lock, flags); | |
c37f3c27 TM |
876 | |
877 | /* clear fifo threshold, disable interrupts, disable SPI transfer */ | |
878 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, | |
879 | MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS | PCH_ALL | | |
880 | SPCR_SPE_BIT); | |
881 | /* clear all interrupts */ | |
882 | pch_spi_writereg(data->master, PCH_SPSR, | |
883 | pch_spi_readreg(data->master, PCH_SPSR)); | |
884 | /* clear FIFO */ | |
885 | pch_spi_clear_fifo(data->master); | |
886 | ||
887 | spin_unlock_irqrestore(&data->lock, flags); | |
25e803f9 TM |
888 | |
889 | return rtn; | |
c37f3c27 TM |
890 | } |
891 | ||
892 | static void pch_dma_rx_complete(void *arg) | |
893 | { | |
894 | struct pch_spi_data *data = arg; | |
895 | ||
896 | /* transfer is completed;inform pch_spi_process_messages_dma */ | |
897 | data->transfer_complete = true; | |
898 | wake_up_interruptible(&data->wait); | |
899 | } | |
900 | ||
901 | static bool pch_spi_filter(struct dma_chan *chan, void *slave) | |
902 | { | |
903 | struct pch_dma_slave *param = slave; | |
904 | ||
905 | if ((chan->chan_id == param->chan_id) && | |
906 | (param->dma_dev == chan->device->dev)) { | |
907 | chan->private = param; | |
908 | return true; | |
909 | } else { | |
910 | return false; | |
911 | } | |
912 | } | |
913 | ||
914 | static void pch_spi_request_dma(struct pch_spi_data *data, int bpw) | |
915 | { | |
916 | dma_cap_mask_t mask; | |
917 | struct dma_chan *chan; | |
918 | struct pci_dev *dma_dev; | |
919 | struct pch_dma_slave *param; | |
920 | struct pch_spi_dma_ctrl *dma; | |
921 | unsigned int width; | |
922 | ||
923 | if (bpw == 8) | |
924 | width = PCH_DMA_WIDTH_1_BYTE; | |
925 | else | |
926 | width = PCH_DMA_WIDTH_2_BYTES; | |
927 | ||
928 | dma = &data->dma; | |
929 | dma_cap_zero(mask); | |
930 | dma_cap_set(DMA_SLAVE, mask); | |
931 | ||
932 | /* Get DMA's dev information */ | |
ee2ece52 TM |
933 | dma_dev = pci_get_bus_and_slot(data->board_dat->pdev->bus->number, |
934 | PCI_DEVFN(12, 0)); | |
c37f3c27 TM |
935 | |
936 | /* Set Tx DMA */ | |
937 | param = &dma->param_tx; | |
938 | param->dma_dev = &dma_dev->dev; | |
939 | param->chan_id = data->master->bus_num * 2; /* Tx = 0, 2 */ | |
940 | param->tx_reg = data->io_base_addr + PCH_SPDWR; | |
941 | param->width = width; | |
942 | chan = dma_request_channel(mask, pch_spi_filter, param); | |
943 | if (!chan) { | |
944 | dev_err(&data->master->dev, | |
945 | "ERROR: dma_request_channel FAILS(Tx)\n"); | |
946 | data->use_dma = 0; | |
947 | return; | |
948 | } | |
949 | dma->chan_tx = chan; | |
950 | ||
951 | /* Set Rx DMA */ | |
952 | param = &dma->param_rx; | |
953 | param->dma_dev = &dma_dev->dev; | |
954 | param->chan_id = data->master->bus_num * 2 + 1; /* Rx = Tx + 1 */ | |
955 | param->rx_reg = data->io_base_addr + PCH_SPDRR; | |
956 | param->width = width; | |
957 | chan = dma_request_channel(mask, pch_spi_filter, param); | |
958 | if (!chan) { | |
959 | dev_err(&data->master->dev, | |
960 | "ERROR: dma_request_channel FAILS(Rx)\n"); | |
961 | dma_release_channel(dma->chan_tx); | |
962 | dma->chan_tx = NULL; | |
963 | data->use_dma = 0; | |
964 | return; | |
965 | } | |
966 | dma->chan_rx = chan; | |
967 | } | |
968 | ||
969 | static void pch_spi_release_dma(struct pch_spi_data *data) | |
970 | { | |
971 | struct pch_spi_dma_ctrl *dma; | |
972 | ||
973 | dma = &data->dma; | |
974 | if (dma->chan_tx) { | |
975 | dma_release_channel(dma->chan_tx); | |
976 | dma->chan_tx = NULL; | |
977 | } | |
978 | if (dma->chan_rx) { | |
979 | dma_release_channel(dma->chan_rx); | |
980 | dma->chan_rx = NULL; | |
981 | } | |
982 | return; | |
983 | } | |
984 | ||
985 | static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) | |
986 | { | |
987 | const u8 *tx_buf; | |
988 | const u16 *tx_sbuf; | |
989 | u8 *tx_dma_buf; | |
990 | u16 *tx_dma_sbuf; | |
991 | struct scatterlist *sg; | |
992 | struct dma_async_tx_descriptor *desc_tx; | |
993 | struct dma_async_tx_descriptor *desc_rx; | |
994 | int num; | |
995 | int i; | |
996 | int size; | |
997 | int rem; | |
7d05b3e8 | 998 | int head; |
c37f3c27 TM |
999 | unsigned long flags; |
1000 | struct pch_spi_dma_ctrl *dma; | |
1001 | ||
1002 | dma = &data->dma; | |
1003 | ||
1004 | /* set baud rate if needed */ | |
1005 | if (data->cur_trans->speed_hz) { | |
1006 | dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__); | |
1007 | spin_lock_irqsave(&data->lock, flags); | |
1008 | pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz); | |
1009 | spin_unlock_irqrestore(&data->lock, flags); | |
1010 | } | |
1011 | ||
1012 | /* set bits per word if needed */ | |
1013 | if (data->cur_trans->bits_per_word && | |
1014 | (data->current_msg->spi->bits_per_word != | |
1015 | data->cur_trans->bits_per_word)) { | |
1016 | dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__); | |
1017 | spin_lock_irqsave(&data->lock, flags); | |
1018 | pch_spi_set_bits_per_word(data->master, | |
1019 | data->cur_trans->bits_per_word); | |
1020 | spin_unlock_irqrestore(&data->lock, flags); | |
1021 | *bpw = data->cur_trans->bits_per_word; | |
1022 | } else { | |
1023 | *bpw = data->current_msg->spi->bits_per_word; | |
1024 | } | |
1025 | data->bpw_len = data->cur_trans->len / (*bpw / 8); | |
1026 | ||
7d05b3e8 TM |
1027 | if (data->bpw_len > PCH_BUF_SIZE) { |
1028 | data->bpw_len = PCH_BUF_SIZE; | |
1029 | data->cur_trans->len -= PCH_BUF_SIZE; | |
1030 | } | |
1031 | ||
c37f3c27 TM |
1032 | /* copy Tx Data */ |
1033 | if (data->cur_trans->tx_buf != NULL) { | |
1034 | if (*bpw == 8) { | |
1035 | tx_buf = data->cur_trans->tx_buf; | |
1036 | tx_dma_buf = dma->tx_buf_virt; | |
1037 | for (i = 0; i < data->bpw_len; i++) | |
1038 | *tx_dma_buf++ = *tx_buf++; | |
1039 | } else { | |
1040 | tx_sbuf = data->cur_trans->tx_buf; | |
1041 | tx_dma_sbuf = dma->tx_buf_virt; | |
1042 | for (i = 0; i < data->bpw_len; i++) | |
1043 | *tx_dma_sbuf++ = *tx_sbuf++; | |
1044 | } | |
1045 | } | |
7d05b3e8 TM |
1046 | |
1047 | /* Calculate Rx parameter for DMA transmitting */ | |
c37f3c27 | 1048 | if (data->bpw_len > PCH_DMA_TRANS_SIZE) { |
7d05b3e8 TM |
1049 | if (data->bpw_len % PCH_DMA_TRANS_SIZE) { |
1050 | num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; | |
1051 | rem = data->bpw_len % PCH_DMA_TRANS_SIZE; | |
1052 | } else { | |
1053 | num = data->bpw_len / PCH_DMA_TRANS_SIZE; | |
1054 | rem = PCH_DMA_TRANS_SIZE; | |
1055 | } | |
c37f3c27 | 1056 | size = PCH_DMA_TRANS_SIZE; |
c37f3c27 TM |
1057 | } else { |
1058 | num = 1; | |
1059 | size = data->bpw_len; | |
1060 | rem = data->bpw_len; | |
1061 | } | |
1062 | dev_dbg(&data->master->dev, "%s num=%d size=%d rem=%d\n", | |
1063 | __func__, num, size, rem); | |
1064 | spin_lock_irqsave(&data->lock, flags); | |
1065 | ||
1066 | /* set receive fifo threshold and transmit fifo threshold */ | |
1067 | pch_spi_setclr_reg(data->master, PCH_SPCR, | |
1068 | ((size - 1) << SPCR_RFIC_FIELD) | | |
f3e03e2e | 1069 | (PCH_TX_THOLD << SPCR_TFIC_FIELD), |
c37f3c27 TM |
1070 | MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS); |
1071 | ||
1072 | spin_unlock_irqrestore(&data->lock, flags); | |
1073 | ||
1074 | /* RX */ | |
1075 | dma->sg_rx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC); | |
1076 | sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */ | |
1077 | /* offset, length setting */ | |
1078 | sg = dma->sg_rx_p; | |
1079 | for (i = 0; i < num; i++, sg++) { | |
f3e03e2e TM |
1080 | if (i == (num - 2)) { |
1081 | sg->offset = size * i; | |
1082 | sg->offset = sg->offset * (*bpw / 8); | |
c37f3c27 TM |
1083 | sg_set_page(sg, virt_to_page(dma->rx_buf_virt), rem, |
1084 | sg->offset); | |
1085 | sg_dma_len(sg) = rem; | |
f3e03e2e TM |
1086 | } else if (i == (num - 1)) { |
1087 | sg->offset = size * (i - 1) + rem; | |
1088 | sg->offset = sg->offset * (*bpw / 8); | |
1089 | sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size, | |
1090 | sg->offset); | |
1091 | sg_dma_len(sg) = size; | |
c37f3c27 | 1092 | } else { |
f3e03e2e | 1093 | sg->offset = size * i; |
c37f3c27 TM |
1094 | sg->offset = sg->offset * (*bpw / 8); |
1095 | sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size, | |
1096 | sg->offset); | |
1097 | sg_dma_len(sg) = size; | |
1098 | } | |
1099 | sg_dma_address(sg) = dma->rx_buf_dma + sg->offset; | |
1100 | } | |
1101 | sg = dma->sg_rx_p; | |
16052827 | 1102 | desc_rx = dmaengine_prep_slave_sg(dma->chan_rx, sg, |
a485df4b | 1103 | num, DMA_DEV_TO_MEM, |
c37f3c27 TM |
1104 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
1105 | if (!desc_rx) { | |
1106 | dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n", | |
1107 | __func__); | |
1108 | return; | |
1109 | } | |
1110 | dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE); | |
1111 | desc_rx->callback = pch_dma_rx_complete; | |
1112 | desc_rx->callback_param = data; | |
1113 | dma->nent = num; | |
1114 | dma->desc_rx = desc_rx; | |
1115 | ||
7d05b3e8 TM |
1116 | /* Calculate Tx parameter for DMA transmitting */ |
1117 | if (data->bpw_len > PCH_MAX_FIFO_DEPTH) { | |
1118 | head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE; | |
1119 | if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) { | |
1120 | num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; | |
1121 | rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head; | |
1122 | } else { | |
1123 | num = data->bpw_len / PCH_DMA_TRANS_SIZE; | |
1124 | rem = data->bpw_len % PCH_DMA_TRANS_SIZE + | |
1125 | PCH_DMA_TRANS_SIZE - head; | |
1126 | } | |
f3e03e2e | 1127 | size = PCH_DMA_TRANS_SIZE; |
f3e03e2e TM |
1128 | } else { |
1129 | num = 1; | |
1130 | size = data->bpw_len; | |
1131 | rem = data->bpw_len; | |
7d05b3e8 | 1132 | head = 0; |
f3e03e2e TM |
1133 | } |
1134 | ||
c37f3c27 TM |
1135 | dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC); |
1136 | sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */ | |
1137 | /* offset, length setting */ | |
1138 | sg = dma->sg_tx_p; | |
1139 | for (i = 0; i < num; i++, sg++) { | |
1140 | if (i == 0) { | |
1141 | sg->offset = 0; | |
7d05b3e8 TM |
1142 | sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head, |
1143 | sg->offset); | |
1144 | sg_dma_len(sg) = size + head; | |
1145 | } else if (i == (num - 1)) { | |
1146 | sg->offset = head + size * i; | |
1147 | sg->offset = sg->offset * (*bpw / 8); | |
c37f3c27 TM |
1148 | sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem, |
1149 | sg->offset); | |
1150 | sg_dma_len(sg) = rem; | |
1151 | } else { | |
7d05b3e8 | 1152 | sg->offset = head + size * i; |
c37f3c27 TM |
1153 | sg->offset = sg->offset * (*bpw / 8); |
1154 | sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size, | |
1155 | sg->offset); | |
1156 | sg_dma_len(sg) = size; | |
1157 | } | |
1158 | sg_dma_address(sg) = dma->tx_buf_dma + sg->offset; | |
1159 | } | |
1160 | sg = dma->sg_tx_p; | |
16052827 | 1161 | desc_tx = dmaengine_prep_slave_sg(dma->chan_tx, |
a485df4b | 1162 | sg, num, DMA_MEM_TO_DEV, |
c37f3c27 TM |
1163 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
1164 | if (!desc_tx) { | |
1165 | dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n", | |
1166 | __func__); | |
1167 | return; | |
1168 | } | |
1169 | dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE); | |
1170 | desc_tx->callback = NULL; | |
1171 | desc_tx->callback_param = data; | |
1172 | dma->nent = num; | |
1173 | dma->desc_tx = desc_tx; | |
1174 | ||
1175 | dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing " | |
1176 | "0x2 to SSNXCR\n", __func__); | |
1177 | ||
1178 | spin_lock_irqsave(&data->lock, flags); | |
1179 | pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW); | |
1180 | desc_rx->tx_submit(desc_rx); | |
1181 | desc_tx->tx_submit(desc_tx); | |
1182 | spin_unlock_irqrestore(&data->lock, flags); | |
1183 | ||
1184 | /* reset transfer complete flag */ | |
1185 | data->transfer_complete = false; | |
1186 | } | |
e8b17b5b MO |
1187 | |
1188 | static void pch_spi_process_messages(struct work_struct *pwork) | |
1189 | { | |
1190 | struct spi_message *pmsg; | |
65308c46 | 1191 | struct pch_spi_data *data; |
e8b17b5b MO |
1192 | int bpw; |
1193 | ||
65308c46 | 1194 | data = container_of(pwork, struct pch_spi_data, work); |
8e41b527 | 1195 | dev_dbg(&data->master->dev, "%s data initialized\n", __func__); |
e8b17b5b MO |
1196 | |
1197 | spin_lock(&data->lock); | |
e8b17b5b | 1198 | /* check if suspend has been initiated;if yes flush queue */ |
65308c46 | 1199 | if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) { |
c37f3c27 TM |
1200 | dev_dbg(&data->master->dev, "%s suspend/remove initiated," |
1201 | "flushing queue\n", __func__); | |
e8b17b5b MO |
1202 | list_for_each_entry(pmsg, data->queue.next, queue) { |
1203 | pmsg->status = -EIO; | |
1204 | ||
1205 | if (pmsg->complete != 0) { | |
1206 | spin_unlock(&data->lock); | |
1207 | pmsg->complete(pmsg->context); | |
1208 | spin_lock(&data->lock); | |
1209 | } | |
1210 | ||
1211 | /* delete from queue */ | |
1212 | list_del_init(&pmsg->queue); | |
1213 | } | |
1214 | ||
1215 | spin_unlock(&data->lock); | |
1216 | return; | |
1217 | } | |
1218 | ||
1219 | data->bcurrent_msg_processing = true; | |
1220 | dev_dbg(&data->master->dev, | |
1221 | "%s Set data->bcurrent_msg_processing= true\n", __func__); | |
1222 | ||
1223 | /* Get the message from the queue and delete it from there. */ | |
65308c46 GL |
1224 | data->current_msg = list_entry(data->queue.next, struct spi_message, |
1225 | queue); | |
e8b17b5b MO |
1226 | |
1227 | list_del_init(&data->current_msg->queue); | |
1228 | ||
1229 | data->current_msg->status = 0; | |
1230 | ||
1231 | pch_spi_select_chip(data, data->current_msg->spi); | |
1232 | ||
1233 | spin_unlock(&data->lock); | |
1234 | ||
c37f3c27 TM |
1235 | if (data->use_dma) |
1236 | pch_spi_request_dma(data, | |
1237 | data->current_msg->spi->bits_per_word); | |
8b7aa961 | 1238 | pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL); |
e8b17b5b | 1239 | do { |
7d05b3e8 | 1240 | int cnt; |
e8b17b5b MO |
1241 | /* If we are already processing a message get the next |
1242 | transfer structure from the message otherwise retrieve | |
1243 | the 1st transfer request from the message. */ | |
1244 | spin_lock(&data->lock); | |
e8b17b5b MO |
1245 | if (data->cur_trans == NULL) { |
1246 | data->cur_trans = | |
c37f3c27 TM |
1247 | list_entry(data->current_msg->transfers.next, |
1248 | struct spi_transfer, transfer_list); | |
1249 | dev_dbg(&data->master->dev, "%s " | |
1250 | ":Getting 1st transfer message\n", __func__); | |
e8b17b5b MO |
1251 | } else { |
1252 | data->cur_trans = | |
c37f3c27 TM |
1253 | list_entry(data->cur_trans->transfer_list.next, |
1254 | struct spi_transfer, transfer_list); | |
1255 | dev_dbg(&data->master->dev, "%s " | |
1256 | ":Getting next transfer message\n", __func__); | |
e8b17b5b | 1257 | } |
e8b17b5b MO |
1258 | spin_unlock(&data->lock); |
1259 | ||
7d05b3e8 TM |
1260 | if (!data->cur_trans->len) |
1261 | goto out; | |
1262 | cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1; | |
1263 | data->save_total_len = data->cur_trans->len; | |
c37f3c27 | 1264 | if (data->use_dma) { |
7d05b3e8 TM |
1265 | int i; |
1266 | char *save_rx_buf = data->cur_trans->rx_buf; | |
1267 | for (i = 0; i < cnt; i ++) { | |
1268 | pch_spi_handle_dma(data, &bpw); | |
0f57e168 TM |
1269 | if (!pch_spi_start_transfer(data)) { |
1270 | data->transfer_complete = true; | |
1271 | data->current_msg->status = -EIO; | |
1272 | data->current_msg->complete | |
1273 | (data->current_msg->context); | |
1274 | data->bcurrent_msg_processing = false; | |
1275 | data->current_msg = NULL; | |
1276 | data->cur_trans = NULL; | |
7d05b3e8 | 1277 | goto out; |
0f57e168 | 1278 | } |
7d05b3e8 TM |
1279 | pch_spi_copy_rx_data_for_dma(data, bpw); |
1280 | } | |
1281 | data->cur_trans->rx_buf = save_rx_buf; | |
c37f3c27 TM |
1282 | } else { |
1283 | pch_spi_set_tx(data, &bpw); | |
1284 | pch_spi_set_ir(data); | |
1285 | pch_spi_copy_rx_data(data, bpw); | |
1286 | kfree(data->pkt_rx_buff); | |
1287 | data->pkt_rx_buff = NULL; | |
1288 | kfree(data->pkt_tx_buff); | |
1289 | data->pkt_tx_buff = NULL; | |
1290 | } | |
e8b17b5b | 1291 | /* increment message count */ |
7d05b3e8 | 1292 | data->cur_trans->len = data->save_total_len; |
e8b17b5b MO |
1293 | data->current_msg->actual_length += data->cur_trans->len; |
1294 | ||
1295 | dev_dbg(&data->master->dev, | |
1296 | "%s:data->current_msg->actual_length=%d\n", | |
1297 | __func__, data->current_msg->actual_length); | |
1298 | ||
1299 | /* check for delay */ | |
1300 | if (data->cur_trans->delay_usecs) { | |
1301 | dev_dbg(&data->master->dev, "%s:" | |
1302 | "delay in usec=%d\n", __func__, | |
1303 | data->cur_trans->delay_usecs); | |
1304 | udelay(data->cur_trans->delay_usecs); | |
1305 | } | |
1306 | ||
1307 | spin_lock(&data->lock); | |
1308 | ||
1309 | /* No more transfer in this message. */ | |
1310 | if ((data->cur_trans->transfer_list.next) == | |
1311 | &(data->current_msg->transfers)) { | |
c37f3c27 | 1312 | pch_spi_nomore_transfer(data); |
e8b17b5b MO |
1313 | } |
1314 | ||
1315 | spin_unlock(&data->lock); | |
1316 | ||
65308c46 | 1317 | } while (data->cur_trans != NULL); |
c37f3c27 | 1318 | |
25e803f9 | 1319 | out: |
8b7aa961 | 1320 | pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH); |
c37f3c27 TM |
1321 | if (data->use_dma) |
1322 | pch_spi_release_dma(data); | |
e8b17b5b MO |
1323 | } |
1324 | ||
f016aeb6 TM |
1325 | static void pch_spi_free_resources(struct pch_spi_board_data *board_dat, |
1326 | struct pch_spi_data *data) | |
e8b17b5b MO |
1327 | { |
1328 | dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); | |
1329 | ||
1330 | /* free workqueue */ | |
f016aeb6 TM |
1331 | if (data->wk != NULL) { |
1332 | destroy_workqueue(data->wk); | |
1333 | data->wk = NULL; | |
e8b17b5b MO |
1334 | dev_dbg(&board_dat->pdev->dev, |
1335 | "%s destroy_workqueue invoked successfully\n", | |
1336 | __func__); | |
1337 | } | |
e8b17b5b MO |
1338 | } |
1339 | ||
f016aeb6 TM |
1340 | static int pch_spi_get_resources(struct pch_spi_board_data *board_dat, |
1341 | struct pch_spi_data *data) | |
e8b17b5b | 1342 | { |
f016aeb6 TM |
1343 | int retval = 0; |
1344 | ||
e8b17b5b MO |
1345 | dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); |
1346 | ||
e8b17b5b | 1347 | /* create workqueue */ |
f016aeb6 TM |
1348 | data->wk = create_singlethread_workqueue(KBUILD_MODNAME); |
1349 | if (!data->wk) { | |
e8b17b5b MO |
1350 | dev_err(&board_dat->pdev->dev, |
1351 | "%s create_singlet hread_workqueue failed\n", __func__); | |
1352 | retval = -EBUSY; | |
1353 | goto err_return; | |
1354 | } | |
1355 | ||
e8b17b5b | 1356 | /* reset PCH SPI h/w */ |
f016aeb6 | 1357 | pch_spi_reset(data->master); |
e8b17b5b MO |
1358 | dev_dbg(&board_dat->pdev->dev, |
1359 | "%s pch_spi_reset invoked successfully\n", __func__); | |
1360 | ||
65308c46 | 1361 | dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__); |
e8b17b5b MO |
1362 | |
1363 | err_return: | |
1364 | if (retval != 0) { | |
1365 | dev_err(&board_dat->pdev->dev, | |
1366 | "%s FAIL:invoking pch_spi_free_resources\n", __func__); | |
f016aeb6 | 1367 | pch_spi_free_resources(board_dat, data); |
e8b17b5b MO |
1368 | } |
1369 | ||
1370 | dev_dbg(&board_dat->pdev->dev, "%s Return=%d\n", __func__, retval); | |
1371 | ||
1372 | return retval; | |
1373 | } | |
1374 | ||
c37f3c27 TM |
1375 | static void pch_free_dma_buf(struct pch_spi_board_data *board_dat, |
1376 | struct pch_spi_data *data) | |
1377 | { | |
1378 | struct pch_spi_dma_ctrl *dma; | |
1379 | ||
1380 | dma = &data->dma; | |
1381 | if (dma->tx_buf_dma) | |
1382 | dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE, | |
1383 | dma->tx_buf_virt, dma->tx_buf_dma); | |
1384 | if (dma->rx_buf_dma) | |
1385 | dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE, | |
1386 | dma->rx_buf_virt, dma->rx_buf_dma); | |
1387 | return; | |
1388 | } | |
1389 | ||
1390 | static void pch_alloc_dma_buf(struct pch_spi_board_data *board_dat, | |
1391 | struct pch_spi_data *data) | |
1392 | { | |
1393 | struct pch_spi_dma_ctrl *dma; | |
1394 | ||
1395 | dma = &data->dma; | |
1396 | /* Get Consistent memory for Tx DMA */ | |
1397 | dma->tx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev, | |
1398 | PCH_BUF_SIZE, &dma->tx_buf_dma, GFP_KERNEL); | |
1399 | /* Get Consistent memory for Rx DMA */ | |
1400 | dma->rx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev, | |
1401 | PCH_BUF_SIZE, &dma->rx_buf_dma, GFP_KERNEL); | |
1402 | } | |
1403 | ||
f016aeb6 | 1404 | static int __devinit pch_spi_pd_probe(struct platform_device *plat_dev) |
e8b17b5b | 1405 | { |
f016aeb6 | 1406 | int ret; |
e8b17b5b | 1407 | struct spi_master *master; |
f016aeb6 TM |
1408 | struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev); |
1409 | struct pch_spi_data *data; | |
e8b17b5b | 1410 | |
c37f3c27 TM |
1411 | dev_dbg(&plat_dev->dev, "%s:debug\n", __func__); |
1412 | ||
f016aeb6 TM |
1413 | master = spi_alloc_master(&board_dat->pdev->dev, |
1414 | sizeof(struct pch_spi_data)); | |
1415 | if (!master) { | |
1416 | dev_err(&plat_dev->dev, "spi_alloc_master[%d] failed.\n", | |
1417 | plat_dev->id); | |
1418 | return -ENOMEM; | |
e8b17b5b MO |
1419 | } |
1420 | ||
f016aeb6 TM |
1421 | data = spi_master_get_devdata(master); |
1422 | data->master = master; | |
e8b17b5b | 1423 | |
f016aeb6 | 1424 | platform_set_drvdata(plat_dev, data); |
e8b17b5b | 1425 | |
c37f3c27 TM |
1426 | /* baseaddress + address offset) */ |
1427 | data->io_base_addr = pci_resource_start(board_dat->pdev, 1) + | |
1428 | PCH_ADDRESS_SIZE * plat_dev->id; | |
f016aeb6 | 1429 | data->io_remap_addr = pci_iomap(board_dat->pdev, 1, 0) + |
c37f3c27 | 1430 | PCH_ADDRESS_SIZE * plat_dev->id; |
f016aeb6 TM |
1431 | if (!data->io_remap_addr) { |
1432 | dev_err(&plat_dev->dev, "%s pci_iomap failed\n", __func__); | |
1433 | ret = -ENOMEM; | |
1434 | goto err_pci_iomap; | |
e8b17b5b MO |
1435 | } |
1436 | ||
f016aeb6 TM |
1437 | dev_dbg(&plat_dev->dev, "[ch%d] remap_addr=%p\n", |
1438 | plat_dev->id, data->io_remap_addr); | |
e8b17b5b MO |
1439 | |
1440 | /* initialize members of SPI master */ | |
1441 | master->bus_num = -1; | |
1442 | master->num_chipselect = PCH_MAX_CS; | |
1443 | master->setup = pch_spi_setup; | |
1444 | master->transfer = pch_spi_transfer; | |
f258b44e | 1445 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; |
e8b17b5b | 1446 | |
f016aeb6 TM |
1447 | data->board_dat = board_dat; |
1448 | data->plat_dev = plat_dev; | |
1449 | data->n_curnt_chip = 255; | |
1450 | data->status = STATUS_RUNNING; | |
1451 | data->ch = plat_dev->id; | |
c37f3c27 | 1452 | data->use_dma = use_dma; |
e8b17b5b | 1453 | |
f016aeb6 TM |
1454 | INIT_LIST_HEAD(&data->queue); |
1455 | spin_lock_init(&data->lock); | |
1456 | INIT_WORK(&data->work, pch_spi_process_messages); | |
1457 | init_waitqueue_head(&data->wait); | |
65308c46 | 1458 | |
f016aeb6 TM |
1459 | ret = pch_spi_get_resources(board_dat, data); |
1460 | if (ret) { | |
1461 | dev_err(&plat_dev->dev, "%s fail(retval=%d)\n", __func__, ret); | |
e8b17b5b MO |
1462 | goto err_spi_get_resources; |
1463 | } | |
1464 | ||
f016aeb6 TM |
1465 | ret = request_irq(board_dat->pdev->irq, pch_spi_handler, |
1466 | IRQF_SHARED, KBUILD_MODNAME, data); | |
1467 | if (ret) { | |
1468 | dev_err(&plat_dev->dev, | |
1469 | "%s request_irq failed\n", __func__); | |
1470 | goto err_request_irq; | |
1471 | } | |
1472 | data->irq_reg_sts = true; | |
e8b17b5b | 1473 | |
e8b17b5b | 1474 | pch_spi_set_master_mode(master); |
e8b17b5b | 1475 | |
f016aeb6 TM |
1476 | ret = spi_register_master(master); |
1477 | if (ret != 0) { | |
1478 | dev_err(&plat_dev->dev, | |
e8b17b5b | 1479 | "%s spi_register_master FAILED\n", __func__); |
f016aeb6 | 1480 | goto err_spi_register_master; |
e8b17b5b MO |
1481 | } |
1482 | ||
c37f3c27 TM |
1483 | if (use_dma) { |
1484 | dev_info(&plat_dev->dev, "Use DMA for data transfers\n"); | |
1485 | pch_alloc_dma_buf(board_dat, data); | |
1486 | } | |
1487 | ||
e8b17b5b MO |
1488 | return 0; |
1489 | ||
f016aeb6 TM |
1490 | err_spi_register_master: |
1491 | free_irq(board_dat->pdev->irq, board_dat); | |
1492 | err_request_irq: | |
1493 | pch_spi_free_resources(board_dat, data); | |
e8b17b5b | 1494 | err_spi_get_resources: |
f016aeb6 TM |
1495 | pci_iounmap(board_dat->pdev, data->io_remap_addr); |
1496 | err_pci_iomap: | |
e8b17b5b | 1497 | spi_master_put(master); |
f016aeb6 TM |
1498 | |
1499 | return ret; | |
e8b17b5b MO |
1500 | } |
1501 | ||
f016aeb6 | 1502 | static int __devexit pch_spi_pd_remove(struct platform_device *plat_dev) |
e8b17b5b | 1503 | { |
f016aeb6 TM |
1504 | struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev); |
1505 | struct pch_spi_data *data = platform_get_drvdata(plat_dev); | |
65308c46 | 1506 | int count; |
c37f3c27 | 1507 | unsigned long flags; |
e8b17b5b | 1508 | |
f016aeb6 TM |
1509 | dev_dbg(&plat_dev->dev, "%s:[ch%d] irq=%d\n", |
1510 | __func__, plat_dev->id, board_dat->pdev->irq); | |
c37f3c27 TM |
1511 | |
1512 | if (use_dma) | |
1513 | pch_free_dma_buf(board_dat, data); | |
1514 | ||
65308c46 GL |
1515 | /* check for any pending messages; no action is taken if the queue |
1516 | * is still full; but at least we tried. Unload anyway */ | |
1517 | count = 500; | |
c37f3c27 | 1518 | spin_lock_irqsave(&data->lock, flags); |
f016aeb6 TM |
1519 | data->status = STATUS_EXITING; |
1520 | while ((list_empty(&data->queue) == 0) && --count) { | |
65308c46 GL |
1521 | dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n", |
1522 | __func__); | |
c37f3c27 | 1523 | spin_unlock_irqrestore(&data->lock, flags); |
65308c46 | 1524 | msleep(PCH_SLEEP_TIME); |
c37f3c27 | 1525 | spin_lock_irqsave(&data->lock, flags); |
e8b17b5b | 1526 | } |
c37f3c27 | 1527 | spin_unlock_irqrestore(&data->lock, flags); |
e8b17b5b | 1528 | |
f016aeb6 TM |
1529 | pch_spi_free_resources(board_dat, data); |
1530 | /* disable interrupts & free IRQ */ | |
1531 | if (data->irq_reg_sts) { | |
1532 | /* disable interrupts */ | |
1533 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); | |
1534 | data->irq_reg_sts = false; | |
1535 | free_irq(board_dat->pdev->irq, data); | |
1536 | } | |
e8b17b5b | 1537 | |
f016aeb6 TM |
1538 | pci_iounmap(board_dat->pdev, data->io_remap_addr); |
1539 | spi_unregister_master(data->master); | |
1540 | spi_master_put(data->master); | |
1541 | platform_set_drvdata(plat_dev, NULL); | |
e8b17b5b | 1542 | |
f016aeb6 | 1543 | return 0; |
e8b17b5b | 1544 | } |
e8b17b5b | 1545 | #ifdef CONFIG_PM |
f016aeb6 TM |
1546 | static int pch_spi_pd_suspend(struct platform_device *pd_dev, |
1547 | pm_message_t state) | |
e8b17b5b MO |
1548 | { |
1549 | u8 count; | |
f016aeb6 TM |
1550 | struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev); |
1551 | struct pch_spi_data *data = platform_get_drvdata(pd_dev); | |
e8b17b5b | 1552 | |
f016aeb6 | 1553 | dev_dbg(&pd_dev->dev, "%s ENTRY\n", __func__); |
e8b17b5b MO |
1554 | |
1555 | if (!board_dat) { | |
f016aeb6 | 1556 | dev_err(&pd_dev->dev, |
e8b17b5b MO |
1557 | "%s pci_get_drvdata returned NULL\n", __func__); |
1558 | return -EFAULT; | |
1559 | } | |
1560 | ||
e8b17b5b MO |
1561 | /* check if the current message is processed: |
1562 | Only after thats done the transfer will be suspended */ | |
1563 | count = 255; | |
c37f3c27 TM |
1564 | while ((--count) > 0) { |
1565 | if (!(data->bcurrent_msg_processing)) | |
e8b17b5b | 1566 | break; |
e8b17b5b MO |
1567 | msleep(PCH_SLEEP_TIME); |
1568 | } | |
1569 | ||
1570 | /* Free IRQ */ | |
f016aeb6 | 1571 | if (data->irq_reg_sts) { |
e8b17b5b | 1572 | /* disable all interrupts */ |
f016aeb6 TM |
1573 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); |
1574 | pch_spi_reset(data->master); | |
1575 | free_irq(board_dat->pdev->irq, data); | |
e8b17b5b | 1576 | |
f016aeb6 TM |
1577 | data->irq_reg_sts = false; |
1578 | dev_dbg(&pd_dev->dev, | |
e8b17b5b MO |
1579 | "%s free_irq invoked successfully.\n", __func__); |
1580 | } | |
1581 | ||
f016aeb6 TM |
1582 | return 0; |
1583 | } | |
1584 | ||
1585 | static int pch_spi_pd_resume(struct platform_device *pd_dev) | |
1586 | { | |
1587 | struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev); | |
1588 | struct pch_spi_data *data = platform_get_drvdata(pd_dev); | |
1589 | int retval; | |
1590 | ||
1591 | if (!board_dat) { | |
1592 | dev_err(&pd_dev->dev, | |
1593 | "%s pci_get_drvdata returned NULL\n", __func__); | |
1594 | return -EFAULT; | |
1595 | } | |
1596 | ||
1597 | if (!data->irq_reg_sts) { | |
1598 | /* register IRQ */ | |
1599 | retval = request_irq(board_dat->pdev->irq, pch_spi_handler, | |
1600 | IRQF_SHARED, KBUILD_MODNAME, data); | |
1601 | if (retval < 0) { | |
1602 | dev_err(&pd_dev->dev, | |
1603 | "%s request_irq failed\n", __func__); | |
1604 | return retval; | |
1605 | } | |
1606 | ||
1607 | /* reset PCH SPI h/w */ | |
1608 | pch_spi_reset(data->master); | |
1609 | pch_spi_set_master_mode(data->master); | |
1610 | data->irq_reg_sts = true; | |
1611 | } | |
1612 | return 0; | |
1613 | } | |
1614 | #else | |
1615 | #define pch_spi_pd_suspend NULL | |
1616 | #define pch_spi_pd_resume NULL | |
1617 | #endif | |
1618 | ||
1619 | static struct platform_driver pch_spi_pd_driver = { | |
1620 | .driver = { | |
1621 | .name = "pch-spi", | |
1622 | .owner = THIS_MODULE, | |
1623 | }, | |
1624 | .probe = pch_spi_pd_probe, | |
1625 | .remove = __devexit_p(pch_spi_pd_remove), | |
1626 | .suspend = pch_spi_pd_suspend, | |
1627 | .resume = pch_spi_pd_resume | |
1628 | }; | |
1629 | ||
1630 | static int __devinit pch_spi_probe(struct pci_dev *pdev, | |
1631 | const struct pci_device_id *id) | |
1632 | { | |
1633 | struct pch_spi_board_data *board_dat; | |
1634 | struct platform_device *pd_dev = NULL; | |
1635 | int retval; | |
1636 | int i; | |
1637 | struct pch_pd_dev_save *pd_dev_save; | |
1638 | ||
1639 | pd_dev_save = kzalloc(sizeof(struct pch_pd_dev_save), GFP_KERNEL); | |
1640 | if (!pd_dev_save) { | |
1641 | dev_err(&pdev->dev, "%s Can't allocate pd_dev_sav\n", __func__); | |
1642 | return -ENOMEM; | |
1643 | } | |
1644 | ||
1645 | board_dat = kzalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL); | |
1646 | if (!board_dat) { | |
1647 | dev_err(&pdev->dev, "%s Can't allocate board_dat\n", __func__); | |
1648 | retval = -ENOMEM; | |
1649 | goto err_no_mem; | |
1650 | } | |
1651 | ||
1652 | retval = pci_request_regions(pdev, KBUILD_MODNAME); | |
1653 | if (retval) { | |
1654 | dev_err(&pdev->dev, "%s request_region failed\n", __func__); | |
1655 | goto pci_request_regions; | |
1656 | } | |
1657 | ||
1658 | board_dat->pdev = pdev; | |
1659 | board_dat->num = id->driver_data; | |
1660 | pd_dev_save->num = id->driver_data; | |
1661 | pd_dev_save->board_dat = board_dat; | |
1662 | ||
1663 | retval = pci_enable_device(pdev); | |
1664 | if (retval) { | |
1665 | dev_err(&pdev->dev, "%s pci_enable_device failed\n", __func__); | |
1666 | goto pci_enable_device; | |
1667 | } | |
1668 | ||
1669 | for (i = 0; i < board_dat->num; i++) { | |
1670 | pd_dev = platform_device_alloc("pch-spi", i); | |
1671 | if (!pd_dev) { | |
1672 | dev_err(&pdev->dev, "platform_device_alloc failed\n"); | |
1673 | goto err_platform_device; | |
1674 | } | |
1675 | pd_dev_save->pd_save[i] = pd_dev; | |
1676 | pd_dev->dev.parent = &pdev->dev; | |
1677 | ||
1678 | retval = platform_device_add_data(pd_dev, board_dat, | |
1679 | sizeof(*board_dat)); | |
1680 | if (retval) { | |
1681 | dev_err(&pdev->dev, | |
1682 | "platform_device_add_data failed\n"); | |
1683 | platform_device_put(pd_dev); | |
1684 | goto err_platform_device; | |
1685 | } | |
1686 | ||
1687 | retval = platform_device_add(pd_dev); | |
1688 | if (retval) { | |
1689 | dev_err(&pdev->dev, "platform_device_add failed\n"); | |
1690 | platform_device_put(pd_dev); | |
1691 | goto err_platform_device; | |
1692 | } | |
1693 | } | |
1694 | ||
1695 | pci_set_drvdata(pdev, pd_dev_save); | |
1696 | ||
1697 | return 0; | |
1698 | ||
1699 | err_platform_device: | |
1700 | pci_disable_device(pdev); | |
1701 | pci_enable_device: | |
1702 | pci_release_regions(pdev); | |
1703 | pci_request_regions: | |
1704 | kfree(board_dat); | |
1705 | err_no_mem: | |
1706 | kfree(pd_dev_save); | |
1707 | ||
1708 | return retval; | |
1709 | } | |
1710 | ||
1711 | static void __devexit pch_spi_remove(struct pci_dev *pdev) | |
1712 | { | |
1713 | int i; | |
1714 | struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev); | |
1715 | ||
1716 | dev_dbg(&pdev->dev, "%s ENTRY:pdev=%p\n", __func__, pdev); | |
1717 | ||
1718 | for (i = 0; i < pd_dev_save->num; i++) | |
1719 | platform_device_unregister(pd_dev_save->pd_save[i]); | |
1720 | ||
1721 | pci_disable_device(pdev); | |
1722 | pci_release_regions(pdev); | |
1723 | kfree(pd_dev_save->board_dat); | |
1724 | kfree(pd_dev_save); | |
1725 | } | |
1726 | ||
1727 | #ifdef CONFIG_PM | |
1728 | static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state) | |
1729 | { | |
1730 | int retval; | |
1731 | struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev); | |
1732 | ||
1733 | dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); | |
1734 | ||
1735 | pd_dev_save->board_dat->suspend_sts = true; | |
1736 | ||
e8b17b5b MO |
1737 | /* save config space */ |
1738 | retval = pci_save_state(pdev); | |
e8b17b5b | 1739 | if (retval == 0) { |
e8b17b5b | 1740 | pci_enable_wake(pdev, PCI_D3hot, 0); |
e8b17b5b | 1741 | pci_disable_device(pdev); |
e8b17b5b | 1742 | pci_set_power_state(pdev, PCI_D3hot); |
e8b17b5b MO |
1743 | } else { |
1744 | dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__); | |
1745 | } | |
1746 | ||
e8b17b5b MO |
1747 | return retval; |
1748 | } | |
1749 | ||
1750 | static int pch_spi_resume(struct pci_dev *pdev) | |
1751 | { | |
1752 | int retval; | |
f016aeb6 | 1753 | struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev); |
e8b17b5b MO |
1754 | dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); |
1755 | ||
e8b17b5b | 1756 | pci_set_power_state(pdev, PCI_D0); |
e8b17b5b MO |
1757 | pci_restore_state(pdev); |
1758 | ||
1759 | retval = pci_enable_device(pdev); | |
1760 | if (retval < 0) { | |
1761 | dev_err(&pdev->dev, | |
1762 | "%s pci_enable_device failed\n", __func__); | |
1763 | } else { | |
e8b17b5b MO |
1764 | pci_enable_wake(pdev, PCI_D3hot, 0); |
1765 | ||
f016aeb6 TM |
1766 | /* set suspend status to false */ |
1767 | pd_dev_save->board_dat->suspend_sts = false; | |
e8b17b5b MO |
1768 | } |
1769 | ||
e8b17b5b MO |
1770 | return retval; |
1771 | } | |
1772 | #else | |
1773 | #define pch_spi_suspend NULL | |
1774 | #define pch_spi_resume NULL | |
1775 | ||
1776 | #endif | |
1777 | ||
c88db233 | 1778 | static struct pci_driver pch_spi_pcidev_driver = { |
e8b17b5b MO |
1779 | .name = "pch_spi", |
1780 | .id_table = pch_spi_pcidev_id, | |
1781 | .probe = pch_spi_probe, | |
1782 | .remove = pch_spi_remove, | |
1783 | .suspend = pch_spi_suspend, | |
1784 | .resume = pch_spi_resume, | |
1785 | }; | |
1786 | ||
1787 | static int __init pch_spi_init(void) | |
1788 | { | |
f016aeb6 TM |
1789 | int ret; |
1790 | ret = platform_driver_register(&pch_spi_pd_driver); | |
1791 | if (ret) | |
1792 | return ret; | |
1793 | ||
c88db233 | 1794 | ret = pci_register_driver(&pch_spi_pcidev_driver); |
f016aeb6 TM |
1795 | if (ret) |
1796 | return ret; | |
1797 | ||
1798 | return 0; | |
e8b17b5b MO |
1799 | } |
1800 | module_init(pch_spi_init); | |
1801 | ||
e8b17b5b MO |
1802 | static void __exit pch_spi_exit(void) |
1803 | { | |
c88db233 | 1804 | pci_unregister_driver(&pch_spi_pcidev_driver); |
f016aeb6 | 1805 | platform_driver_unregister(&pch_spi_pd_driver); |
e8b17b5b MO |
1806 | } |
1807 | module_exit(pch_spi_exit); | |
1808 | ||
c37f3c27 TM |
1809 | module_param(use_dma, int, 0644); |
1810 | MODULE_PARM_DESC(use_dma, | |
1811 | "to use DMA for data transfers pass 1 else 0; default 1"); | |
1812 | ||
e8b17b5b | 1813 | MODULE_LICENSE("GPL"); |
2b246283 | 1814 | MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semiconductor ML7xxx IOH SPI Driver"); |