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e8689e63 LW |
1 | /* |
2 | * Copyright (c) 2006 ARM Ltd. | |
3 | * Copyright (c) 2010 ST-Ericsson SA | |
4 | * | |
5 | * Author: Peter Pearse <peter.pearse@arm.com> | |
6 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
16 | * more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along with | |
19 | * this program; if not, write to the Free Software Foundation, Inc., 59 | |
20 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | * | |
94ae8522 RKAL |
22 | * The full GNU General Public License is in this distribution in the file |
23 | * called COPYING. | |
e8689e63 LW |
24 | * |
25 | * Documentation: ARM DDI 0196G == PL080 | |
94ae8522 | 26 | * Documentation: ARM DDI 0218E == PL081 |
e8689e63 | 27 | * |
94ae8522 RKAL |
28 | * PL080 & PL081 both have 16 sets of DMA signals that can be routed to any |
29 | * channel. | |
e8689e63 LW |
30 | * |
31 | * The PL080 has 8 channels available for simultaneous use, and the PL081 | |
32 | * has only two channels. So on these DMA controllers the number of channels | |
33 | * and the number of incoming DMA signals are two totally different things. | |
34 | * It is usually not possible to theoretically handle all physical signals, | |
35 | * so a multiplexing scheme with possible denial of use is necessary. | |
36 | * | |
37 | * The PL080 has a dual bus master, PL081 has a single master. | |
38 | * | |
39 | * Memory to peripheral transfer may be visualized as | |
40 | * Get data from memory to DMAC | |
41 | * Until no data left | |
42 | * On burst request from peripheral | |
43 | * Destination burst from DMAC to peripheral | |
44 | * Clear burst request | |
45 | * Raise terminal count interrupt | |
46 | * | |
47 | * For peripherals with a FIFO: | |
48 | * Source burst size == half the depth of the peripheral FIFO | |
49 | * Destination burst size == the depth of the peripheral FIFO | |
50 | * | |
51 | * (Bursts are irrelevant for mem to mem transfers - there are no burst | |
52 | * signals, the DMA controller will simply facilitate its AHB master.) | |
53 | * | |
54 | * ASSUMES default (little) endianness for DMA transfers | |
55 | * | |
9dc2c200 RKAL |
56 | * The PL08x has two flow control settings: |
57 | * - DMAC flow control: the transfer size defines the number of transfers | |
58 | * which occur for the current LLI entry, and the DMAC raises TC at the | |
59 | * end of every LLI entry. Observed behaviour shows the DMAC listening | |
60 | * to both the BREQ and SREQ signals (contrary to documented), | |
61 | * transferring data if either is active. The LBREQ and LSREQ signals | |
62 | * are ignored. | |
63 | * | |
64 | * - Peripheral flow control: the transfer size is ignored (and should be | |
65 | * zero). The data is transferred from the current LLI entry, until | |
66 | * after the final transfer signalled by LBREQ or LSREQ. The DMAC | |
67 | * will then move to the next LLI entry. | |
68 | * | |
e8689e63 LW |
69 | * Global TODO: |
70 | * - Break out common code from arch/arm/mach-s3c64xx and share | |
71 | */ | |
730404ac | 72 | #include <linux/amba/bus.h> |
e8689e63 LW |
73 | #include <linux/amba/pl08x.h> |
74 | #include <linux/debugfs.h> | |
0c38d701 VK |
75 | #include <linux/delay.h> |
76 | #include <linux/device.h> | |
77 | #include <linux/dmaengine.h> | |
78 | #include <linux/dmapool.h> | |
8516f52f | 79 | #include <linux/dma-mapping.h> |
0c38d701 VK |
80 | #include <linux/init.h> |
81 | #include <linux/interrupt.h> | |
82 | #include <linux/module.h> | |
b7b6018b | 83 | #include <linux/pm_runtime.h> |
e8689e63 | 84 | #include <linux/seq_file.h> |
0c38d701 | 85 | #include <linux/slab.h> |
e8689e63 | 86 | #include <asm/hardware/pl080.h> |
e8689e63 | 87 | |
d2ebfb33 | 88 | #include "dmaengine.h" |
01d8dc64 | 89 | #include "virt-dma.h" |
d2ebfb33 | 90 | |
e8689e63 LW |
91 | #define DRIVER_NAME "pl08xdmac" |
92 | ||
7703eac9 | 93 | static struct amba_driver pl08x_amba_driver; |
b23f204c | 94 | struct pl08x_driver_data; |
7703eac9 | 95 | |
e8689e63 | 96 | /** |
94ae8522 | 97 | * struct vendor_data - vendor-specific config parameters for PL08x derivatives |
e8689e63 | 98 | * @channels: the number of channels available in this variant |
94ae8522 | 99 | * @dualmaster: whether this version supports dual AHB masters or not. |
affa115e LW |
100 | * @nomadik: whether the channels have Nomadik security extension bits |
101 | * that need to be checked for permission before use and some registers are | |
102 | * missing | |
e8689e63 LW |
103 | */ |
104 | struct vendor_data { | |
e8689e63 LW |
105 | u8 channels; |
106 | bool dualmaster; | |
affa115e | 107 | bool nomadik; |
e8689e63 LW |
108 | }; |
109 | ||
110 | /* | |
111 | * PL08X private data structures | |
e8b5e11d | 112 | * An LLI struct - see PL08x TRM. Note that next uses bit[0] as a bus bit, |
e25761d7 RKAL |
113 | * start & end do not - their bus bit info is in cctl. Also note that these |
114 | * are fixed 32-bit quantities. | |
e8689e63 | 115 | */ |
7cb72ad9 | 116 | struct pl08x_lli { |
e25761d7 RKAL |
117 | u32 src; |
118 | u32 dst; | |
bfddfb45 | 119 | u32 lli; |
e8689e63 LW |
120 | u32 cctl; |
121 | }; | |
122 | ||
b23f204c RK |
123 | /** |
124 | * struct pl08x_bus_data - information of source or destination | |
125 | * busses for a transfer | |
126 | * @addr: current address | |
127 | * @maxwidth: the maximum width of a transfer on this bus | |
128 | * @buswidth: the width of this bus in bytes: 1, 2 or 4 | |
129 | */ | |
130 | struct pl08x_bus_data { | |
131 | dma_addr_t addr; | |
132 | u8 maxwidth; | |
133 | u8 buswidth; | |
134 | }; | |
135 | ||
136 | /** | |
137 | * struct pl08x_phy_chan - holder for the physical channels | |
138 | * @id: physical index to this channel | |
139 | * @lock: a lock to use when altering an instance of this struct | |
b23f204c RK |
140 | * @serving: the virtual channel currently being served by this physical |
141 | * channel | |
ad0de2ac RK |
142 | * @locked: channel unavailable for the system, e.g. dedicated to secure |
143 | * world | |
b23f204c RK |
144 | */ |
145 | struct pl08x_phy_chan { | |
146 | unsigned int id; | |
147 | void __iomem *base; | |
148 | spinlock_t lock; | |
b23f204c | 149 | struct pl08x_dma_chan *serving; |
ad0de2ac | 150 | bool locked; |
b23f204c RK |
151 | }; |
152 | ||
153 | /** | |
154 | * struct pl08x_sg - structure containing data per sg | |
155 | * @src_addr: src address of sg | |
156 | * @dst_addr: dst address of sg | |
157 | * @len: transfer len in bytes | |
158 | * @node: node for txd's dsg_list | |
159 | */ | |
160 | struct pl08x_sg { | |
161 | dma_addr_t src_addr; | |
162 | dma_addr_t dst_addr; | |
163 | size_t len; | |
164 | struct list_head node; | |
165 | }; | |
166 | ||
167 | /** | |
168 | * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor | |
01d8dc64 | 169 | * @vd: virtual DMA descriptor |
b23f204c | 170 | * @dsg_list: list of children sg's |
b23f204c RK |
171 | * @llis_bus: DMA memory address (physical) start for the LLIs |
172 | * @llis_va: virtual memory address start for the LLIs | |
173 | * @cctl: control reg values for current txd | |
174 | * @ccfg: config reg values for current txd | |
18536134 RK |
175 | * @done: this marks completed descriptors, which should not have their |
176 | * mux released. | |
b23f204c RK |
177 | */ |
178 | struct pl08x_txd { | |
01d8dc64 | 179 | struct virt_dma_desc vd; |
b23f204c | 180 | struct list_head dsg_list; |
b23f204c RK |
181 | dma_addr_t llis_bus; |
182 | struct pl08x_lli *llis_va; | |
183 | /* Default cctl value for LLIs */ | |
184 | u32 cctl; | |
185 | /* | |
186 | * Settings to be put into the physical channel when we | |
187 | * trigger this txd. Other registers are in llis_va[0]. | |
188 | */ | |
189 | u32 ccfg; | |
18536134 | 190 | bool done; |
b23f204c RK |
191 | }; |
192 | ||
193 | /** | |
194 | * struct pl08x_dma_chan_state - holds the PL08x specific virtual channel | |
195 | * states | |
196 | * @PL08X_CHAN_IDLE: the channel is idle | |
197 | * @PL08X_CHAN_RUNNING: the channel has allocated a physical transport | |
198 | * channel and is running a transfer on it | |
199 | * @PL08X_CHAN_PAUSED: the channel has allocated a physical transport | |
200 | * channel, but the transfer is currently paused | |
201 | * @PL08X_CHAN_WAITING: the channel is waiting for a physical transport | |
202 | * channel to become available (only pertains to memcpy channels) | |
203 | */ | |
204 | enum pl08x_dma_chan_state { | |
205 | PL08X_CHAN_IDLE, | |
206 | PL08X_CHAN_RUNNING, | |
207 | PL08X_CHAN_PAUSED, | |
208 | PL08X_CHAN_WAITING, | |
209 | }; | |
210 | ||
211 | /** | |
212 | * struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel | |
01d8dc64 | 213 | * @vc: wrappped virtual channel |
b23f204c | 214 | * @phychan: the physical channel utilized by this channel, if there is one |
b23f204c RK |
215 | * @name: name of channel |
216 | * @cd: channel platform data | |
217 | * @runtime_addr: address for RX/TX according to the runtime config | |
b23f204c RK |
218 | * @at: active transaction on this channel |
219 | * @lock: a lock for this channel data | |
220 | * @host: a pointer to the host (internal use) | |
221 | * @state: whether the channel is idle, paused, running etc | |
222 | * @slave: whether this channel is a device (slave) or for memcpy | |
ad0de2ac | 223 | * @signal: the physical DMA request signal which this channel is using |
5e2479bd | 224 | * @mux_use: count of descriptors using this DMA request signal setting |
b23f204c RK |
225 | */ |
226 | struct pl08x_dma_chan { | |
01d8dc64 | 227 | struct virt_dma_chan vc; |
b23f204c | 228 | struct pl08x_phy_chan *phychan; |
550ec36f | 229 | const char *name; |
b23f204c | 230 | const struct pl08x_channel_data *cd; |
ed91c13d | 231 | struct dma_slave_config cfg; |
b23f204c | 232 | struct pl08x_txd *at; |
b23f204c RK |
233 | struct pl08x_driver_data *host; |
234 | enum pl08x_dma_chan_state state; | |
235 | bool slave; | |
ad0de2ac | 236 | int signal; |
5e2479bd | 237 | unsigned mux_use; |
b23f204c RK |
238 | }; |
239 | ||
e8689e63 LW |
240 | /** |
241 | * struct pl08x_driver_data - the local state holder for the PL08x | |
242 | * @slave: slave engine for this instance | |
243 | * @memcpy: memcpy engine for this instance | |
244 | * @base: virtual memory base (remapped) for the PL08x | |
245 | * @adev: the corresponding AMBA (PrimeCell) bus entry | |
246 | * @vd: vendor data for this PL08x variant | |
247 | * @pd: platform data passed in from the platform/machine | |
248 | * @phy_chans: array of data for the physical channels | |
249 | * @pool: a pool for the LLI descriptors | |
250 | * @pool_ctr: counter of LLIs in the pool | |
3e27ee84 VK |
251 | * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI |
252 | * fetches | |
30749cb4 | 253 | * @mem_buses: set to indicate memory transfers on AHB2. |
e8689e63 LW |
254 | * @lock: a spinlock for this struct |
255 | */ | |
256 | struct pl08x_driver_data { | |
257 | struct dma_device slave; | |
258 | struct dma_device memcpy; | |
259 | void __iomem *base; | |
260 | struct amba_device *adev; | |
f96ca9ec | 261 | const struct vendor_data *vd; |
e8689e63 LW |
262 | struct pl08x_platform_data *pd; |
263 | struct pl08x_phy_chan *phy_chans; | |
264 | struct dma_pool *pool; | |
265 | int pool_ctr; | |
30749cb4 RKAL |
266 | u8 lli_buses; |
267 | u8 mem_buses; | |
e8689e63 LW |
268 | }; |
269 | ||
270 | /* | |
271 | * PL08X specific defines | |
272 | */ | |
273 | ||
e8689e63 LW |
274 | /* Size (bytes) of each LLI buffer allocated for one transfer */ |
275 | # define PL08X_LLI_TSFR_SIZE 0x2000 | |
276 | ||
e8b5e11d | 277 | /* Maximum times we call dma_pool_alloc on this pool without freeing */ |
7cb72ad9 | 278 | #define MAX_NUM_TSFR_LLIS (PL08X_LLI_TSFR_SIZE/sizeof(struct pl08x_lli)) |
e8689e63 LW |
279 | #define PL08X_ALIGN 8 |
280 | ||
281 | static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan) | |
282 | { | |
01d8dc64 | 283 | return container_of(chan, struct pl08x_dma_chan, vc.chan); |
e8689e63 LW |
284 | } |
285 | ||
501e67e8 RKAL |
286 | static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx) |
287 | { | |
01d8dc64 | 288 | return container_of(tx, struct pl08x_txd, vd.tx); |
501e67e8 RKAL |
289 | } |
290 | ||
6b16c8b1 RK |
291 | /* |
292 | * Mux handling. | |
293 | * | |
294 | * This gives us the DMA request input to the PL08x primecell which the | |
295 | * peripheral described by the channel data will be routed to, possibly | |
296 | * via a board/SoC specific external MUX. One important point to note | |
297 | * here is that this does not depend on the physical channel. | |
298 | */ | |
ad0de2ac | 299 | static int pl08x_request_mux(struct pl08x_dma_chan *plchan) |
6b16c8b1 RK |
300 | { |
301 | const struct pl08x_platform_data *pd = plchan->host->pd; | |
302 | int ret; | |
303 | ||
5e2479bd | 304 | if (plchan->mux_use++ == 0 && pd->get_signal) { |
6b16c8b1 | 305 | ret = pd->get_signal(plchan->cd); |
5e2479bd RK |
306 | if (ret < 0) { |
307 | plchan->mux_use = 0; | |
6b16c8b1 | 308 | return ret; |
5e2479bd | 309 | } |
6b16c8b1 | 310 | |
ad0de2ac | 311 | plchan->signal = ret; |
6b16c8b1 RK |
312 | } |
313 | return 0; | |
314 | } | |
315 | ||
316 | static void pl08x_release_mux(struct pl08x_dma_chan *plchan) | |
317 | { | |
318 | const struct pl08x_platform_data *pd = plchan->host->pd; | |
319 | ||
5e2479bd RK |
320 | if (plchan->signal >= 0) { |
321 | WARN_ON(plchan->mux_use == 0); | |
322 | ||
323 | if (--plchan->mux_use == 0 && pd->put_signal) { | |
324 | pd->put_signal(plchan->cd, plchan->signal); | |
325 | plchan->signal = -1; | |
326 | } | |
6b16c8b1 RK |
327 | } |
328 | } | |
329 | ||
e8689e63 LW |
330 | /* |
331 | * Physical channel handling | |
332 | */ | |
333 | ||
334 | /* Whether a certain channel is busy or not */ | |
335 | static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch) | |
336 | { | |
337 | unsigned int val; | |
338 | ||
339 | val = readl(ch->base + PL080_CH_CONFIG); | |
340 | return val & PL080_CONFIG_ACTIVE; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Set the initial DMA register values i.e. those for the first LLI | |
e8b5e11d | 345 | * The next LLI pointer and the configuration interrupt bit have |
c885bee4 RKAL |
346 | * been set when the LLIs were constructed. Poke them into the hardware |
347 | * and start the transfer. | |
e8689e63 | 348 | */ |
eab82533 | 349 | static void pl08x_start_next_txd(struct pl08x_dma_chan *plchan) |
e8689e63 | 350 | { |
c885bee4 | 351 | struct pl08x_driver_data *pl08x = plchan->host; |
e8689e63 | 352 | struct pl08x_phy_chan *phychan = plchan->phychan; |
879f127b RK |
353 | struct virt_dma_desc *vd = vchan_next_desc(&plchan->vc); |
354 | struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); | |
eab82533 | 355 | struct pl08x_lli *lli; |
09b3c323 | 356 | u32 val; |
c885bee4 | 357 | |
879f127b | 358 | list_del(&txd->vd.node); |
eab82533 | 359 | |
c885bee4 | 360 | plchan->at = txd; |
e8689e63 | 361 | |
c885bee4 RKAL |
362 | /* Wait for channel inactive */ |
363 | while (pl08x_phy_channel_busy(phychan)) | |
364 | cpu_relax(); | |
e8689e63 | 365 | |
eab82533 RK |
366 | lli = &txd->llis_va[0]; |
367 | ||
c885bee4 RKAL |
368 | dev_vdbg(&pl08x->adev->dev, |
369 | "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " | |
19524d77 RKAL |
370 | "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n", |
371 | phychan->id, lli->src, lli->dst, lli->lli, lli->cctl, | |
09b3c323 | 372 | txd->ccfg); |
19524d77 RKAL |
373 | |
374 | writel(lli->src, phychan->base + PL080_CH_SRC_ADDR); | |
375 | writel(lli->dst, phychan->base + PL080_CH_DST_ADDR); | |
376 | writel(lli->lli, phychan->base + PL080_CH_LLI); | |
377 | writel(lli->cctl, phychan->base + PL080_CH_CONTROL); | |
09b3c323 | 378 | writel(txd->ccfg, phychan->base + PL080_CH_CONFIG); |
c885bee4 RKAL |
379 | |
380 | /* Enable the DMA channel */ | |
381 | /* Do not access config register until channel shows as disabled */ | |
382 | while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id)) | |
19386b32 | 383 | cpu_relax(); |
e8689e63 | 384 | |
c885bee4 RKAL |
385 | /* Do not access config register until channel shows as inactive */ |
386 | val = readl(phychan->base + PL080_CH_CONFIG); | |
e8689e63 | 387 | while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE)) |
c885bee4 | 388 | val = readl(phychan->base + PL080_CH_CONFIG); |
e8689e63 | 389 | |
c885bee4 | 390 | writel(val | PL080_CONFIG_ENABLE, phychan->base + PL080_CH_CONFIG); |
e8689e63 LW |
391 | } |
392 | ||
393 | /* | |
81796616 | 394 | * Pause the channel by setting the HALT bit. |
e8689e63 | 395 | * |
81796616 RKAL |
396 | * For M->P transfers, pause the DMAC first and then stop the peripheral - |
397 | * the FIFO can only drain if the peripheral is still requesting data. | |
398 | * (note: this can still timeout if the DMAC FIFO never drains of data.) | |
e8689e63 | 399 | * |
81796616 RKAL |
400 | * For P->M transfers, disable the peripheral first to stop it filling |
401 | * the DMAC FIFO, and then pause the DMAC. | |
e8689e63 LW |
402 | */ |
403 | static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch) | |
404 | { | |
405 | u32 val; | |
81796616 | 406 | int timeout; |
e8689e63 LW |
407 | |
408 | /* Set the HALT bit and wait for the FIFO to drain */ | |
409 | val = readl(ch->base + PL080_CH_CONFIG); | |
410 | val |= PL080_CONFIG_HALT; | |
411 | writel(val, ch->base + PL080_CH_CONFIG); | |
412 | ||
413 | /* Wait for channel inactive */ | |
81796616 RKAL |
414 | for (timeout = 1000; timeout; timeout--) { |
415 | if (!pl08x_phy_channel_busy(ch)) | |
416 | break; | |
417 | udelay(1); | |
418 | } | |
419 | if (pl08x_phy_channel_busy(ch)) | |
420 | pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id); | |
e8689e63 LW |
421 | } |
422 | ||
423 | static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch) | |
424 | { | |
425 | u32 val; | |
426 | ||
427 | /* Clear the HALT bit */ | |
428 | val = readl(ch->base + PL080_CH_CONFIG); | |
429 | val &= ~PL080_CONFIG_HALT; | |
430 | writel(val, ch->base + PL080_CH_CONFIG); | |
431 | } | |
432 | ||
fb526210 RKAL |
433 | /* |
434 | * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and | |
435 | * clears any pending interrupt status. This should not be used for | |
436 | * an on-going transfer, but as a method of shutting down a channel | |
437 | * (eg, when it's no longer used) or terminating a transfer. | |
438 | */ | |
439 | static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x, | |
440 | struct pl08x_phy_chan *ch) | |
e8689e63 | 441 | { |
fb526210 | 442 | u32 val = readl(ch->base + PL080_CH_CONFIG); |
e8689e63 | 443 | |
fb526210 RKAL |
444 | val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK | |
445 | PL080_CONFIG_TC_IRQ_MASK); | |
e8689e63 | 446 | |
e8689e63 | 447 | writel(val, ch->base + PL080_CH_CONFIG); |
fb526210 RKAL |
448 | |
449 | writel(1 << ch->id, pl08x->base + PL080_ERR_CLEAR); | |
450 | writel(1 << ch->id, pl08x->base + PL080_TC_CLEAR); | |
e8689e63 LW |
451 | } |
452 | ||
453 | static inline u32 get_bytes_in_cctl(u32 cctl) | |
454 | { | |
455 | /* The source width defines the number of bytes */ | |
456 | u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK; | |
457 | ||
458 | switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { | |
459 | case PL080_WIDTH_8BIT: | |
460 | break; | |
461 | case PL080_WIDTH_16BIT: | |
462 | bytes *= 2; | |
463 | break; | |
464 | case PL080_WIDTH_32BIT: | |
465 | bytes *= 4; | |
466 | break; | |
467 | } | |
468 | return bytes; | |
469 | } | |
470 | ||
471 | /* The channel should be paused when calling this */ | |
472 | static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) | |
473 | { | |
474 | struct pl08x_phy_chan *ch; | |
e8689e63 LW |
475 | struct pl08x_txd *txd; |
476 | unsigned long flags; | |
cace6585 | 477 | size_t bytes = 0; |
e8689e63 | 478 | |
083be28a | 479 | spin_lock_irqsave(&plchan->vc.lock, flags); |
e8689e63 LW |
480 | ch = plchan->phychan; |
481 | txd = plchan->at; | |
482 | ||
483 | /* | |
db9f136a RKAL |
484 | * Follow the LLIs to get the number of remaining |
485 | * bytes in the currently active transaction. | |
e8689e63 LW |
486 | */ |
487 | if (ch && txd) { | |
4c0df6a3 | 488 | u32 clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2; |
e8689e63 | 489 | |
db9f136a | 490 | /* First get the remaining bytes in the active transfer */ |
e8689e63 LW |
491 | bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL)); |
492 | ||
493 | if (clli) { | |
db9f136a RKAL |
494 | struct pl08x_lli *llis_va = txd->llis_va; |
495 | dma_addr_t llis_bus = txd->llis_bus; | |
496 | int index; | |
497 | ||
498 | BUG_ON(clli < llis_bus || clli >= llis_bus + | |
499 | sizeof(struct pl08x_lli) * MAX_NUM_TSFR_LLIS); | |
e8689e63 | 500 | |
db9f136a RKAL |
501 | /* |
502 | * Locate the next LLI - as this is an array, | |
503 | * it's simple maths to find. | |
504 | */ | |
505 | index = (clli - llis_bus) / sizeof(struct pl08x_lli); | |
506 | ||
507 | for (; index < MAX_NUM_TSFR_LLIS; index++) { | |
508 | bytes += get_bytes_in_cctl(llis_va[index].cctl); | |
e8689e63 | 509 | |
e8689e63 | 510 | /* |
e8b5e11d | 511 | * A LLI pointer of 0 terminates the LLI list |
e8689e63 | 512 | */ |
db9f136a RKAL |
513 | if (!llis_va[index].lli) |
514 | break; | |
e8689e63 LW |
515 | } |
516 | } | |
517 | } | |
518 | ||
519 | /* Sum up all queued transactions */ | |
879f127b | 520 | if (!list_empty(&plchan->vc.desc_issued)) { |
ea160561 | 521 | struct pl08x_txd *txdi; |
879f127b | 522 | list_for_each_entry(txdi, &plchan->vc.desc_issued, vd.node) { |
ea160561 RK |
523 | struct pl08x_sg *dsg; |
524 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
525 | bytes += dsg->len; | |
526 | } | |
527 | } | |
528 | ||
879f127b | 529 | if (!list_empty(&plchan->vc.desc_submitted)) { |
db9f136a | 530 | struct pl08x_txd *txdi; |
879f127b | 531 | list_for_each_entry(txdi, &plchan->vc.desc_submitted, vd.node) { |
b7f69d9d VK |
532 | struct pl08x_sg *dsg; |
533 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
534 | bytes += dsg->len; | |
e8689e63 | 535 | } |
e8689e63 LW |
536 | } |
537 | ||
083be28a | 538 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
e8689e63 LW |
539 | |
540 | return bytes; | |
541 | } | |
542 | ||
543 | /* | |
544 | * Allocate a physical channel for a virtual channel | |
94ae8522 RKAL |
545 | * |
546 | * Try to locate a physical channel to be used for this transfer. If all | |
547 | * are taken return NULL and the requester will have to cope by using | |
548 | * some fallback PIO mode or retrying later. | |
e8689e63 LW |
549 | */ |
550 | static struct pl08x_phy_chan * | |
551 | pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, | |
552 | struct pl08x_dma_chan *virt_chan) | |
553 | { | |
554 | struct pl08x_phy_chan *ch = NULL; | |
555 | unsigned long flags; | |
556 | int i; | |
557 | ||
e8689e63 LW |
558 | for (i = 0; i < pl08x->vd->channels; i++) { |
559 | ch = &pl08x->phy_chans[i]; | |
560 | ||
561 | spin_lock_irqsave(&ch->lock, flags); | |
562 | ||
affa115e | 563 | if (!ch->locked && !ch->serving) { |
e8689e63 | 564 | ch->serving = virt_chan; |
e8689e63 LW |
565 | spin_unlock_irqrestore(&ch->lock, flags); |
566 | break; | |
567 | } | |
568 | ||
569 | spin_unlock_irqrestore(&ch->lock, flags); | |
570 | } | |
571 | ||
572 | if (i == pl08x->vd->channels) { | |
573 | /* No physical channel available, cope with it */ | |
574 | return NULL; | |
575 | } | |
576 | ||
577 | return ch; | |
578 | } | |
579 | ||
a5a488db | 580 | /* Mark the physical channel as free. Note, this write is atomic. */ |
e8689e63 LW |
581 | static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x, |
582 | struct pl08x_phy_chan *ch) | |
583 | { | |
a5a488db RK |
584 | ch->serving = NULL; |
585 | } | |
e8689e63 | 586 | |
a5a488db RK |
587 | /* |
588 | * Try to allocate a physical channel. When successful, assign it to | |
589 | * this virtual channel, and initiate the next descriptor. The | |
590 | * virtual channel lock must be held at this point. | |
591 | */ | |
592 | static void pl08x_phy_alloc_and_start(struct pl08x_dma_chan *plchan) | |
593 | { | |
594 | struct pl08x_driver_data *pl08x = plchan->host; | |
595 | struct pl08x_phy_chan *ch; | |
fb526210 | 596 | |
a5a488db RK |
597 | ch = pl08x_get_phy_channel(pl08x, plchan); |
598 | if (!ch) { | |
599 | dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name); | |
600 | plchan->state = PL08X_CHAN_WAITING; | |
601 | return; | |
602 | } | |
e8689e63 | 603 | |
a5a488db RK |
604 | dev_dbg(&pl08x->adev->dev, "allocated physical channel %d for xfer on %s\n", |
605 | ch->id, plchan->name); | |
606 | ||
607 | plchan->phychan = ch; | |
608 | plchan->state = PL08X_CHAN_RUNNING; | |
609 | pl08x_start_next_txd(plchan); | |
610 | } | |
611 | ||
612 | static void pl08x_phy_reassign_start(struct pl08x_phy_chan *ch, | |
613 | struct pl08x_dma_chan *plchan) | |
614 | { | |
615 | struct pl08x_driver_data *pl08x = plchan->host; | |
616 | ||
617 | dev_dbg(&pl08x->adev->dev, "reassigned physical channel %d for xfer on %s\n", | |
618 | ch->id, plchan->name); | |
619 | ||
620 | /* | |
621 | * We do this without taking the lock; we're really only concerned | |
622 | * about whether this pointer is NULL or not, and we're guaranteed | |
623 | * that this will only be called when it _already_ is non-NULL. | |
624 | */ | |
625 | ch->serving = plchan; | |
626 | plchan->phychan = ch; | |
627 | plchan->state = PL08X_CHAN_RUNNING; | |
628 | pl08x_start_next_txd(plchan); | |
629 | } | |
630 | ||
631 | /* | |
632 | * Free a physical DMA channel, potentially reallocating it to another | |
633 | * virtual channel if we have any pending. | |
634 | */ | |
635 | static void pl08x_phy_free(struct pl08x_dma_chan *plchan) | |
636 | { | |
637 | struct pl08x_driver_data *pl08x = plchan->host; | |
638 | struct pl08x_dma_chan *p, *next; | |
639 | ||
640 | retry: | |
641 | next = NULL; | |
642 | ||
643 | /* Find a waiting virtual channel for the next transfer. */ | |
01d8dc64 | 644 | list_for_each_entry(p, &pl08x->memcpy.channels, vc.chan.device_node) |
a5a488db RK |
645 | if (p->state == PL08X_CHAN_WAITING) { |
646 | next = p; | |
647 | break; | |
648 | } | |
649 | ||
650 | if (!next) { | |
01d8dc64 | 651 | list_for_each_entry(p, &pl08x->slave.channels, vc.chan.device_node) |
a5a488db RK |
652 | if (p->state == PL08X_CHAN_WAITING) { |
653 | next = p; | |
654 | break; | |
655 | } | |
656 | } | |
657 | ||
658 | /* Ensure that the physical channel is stopped */ | |
659 | pl08x_terminate_phy_chan(pl08x, plchan->phychan); | |
660 | ||
661 | if (next) { | |
662 | bool success; | |
663 | ||
664 | /* | |
665 | * Eww. We know this isn't going to deadlock | |
666 | * but lockdep probably doesn't. | |
667 | */ | |
083be28a | 668 | spin_lock(&next->vc.lock); |
a5a488db RK |
669 | /* Re-check the state now that we have the lock */ |
670 | success = next->state == PL08X_CHAN_WAITING; | |
671 | if (success) | |
672 | pl08x_phy_reassign_start(plchan->phychan, next); | |
083be28a | 673 | spin_unlock(&next->vc.lock); |
a5a488db RK |
674 | |
675 | /* If the state changed, try to find another channel */ | |
676 | if (!success) | |
677 | goto retry; | |
678 | } else { | |
679 | /* No more jobs, so free up the physical channel */ | |
680 | pl08x_put_phy_channel(pl08x, plchan->phychan); | |
681 | } | |
682 | ||
683 | plchan->phychan = NULL; | |
684 | plchan->state = PL08X_CHAN_IDLE; | |
e8689e63 LW |
685 | } |
686 | ||
687 | /* | |
688 | * LLI handling | |
689 | */ | |
690 | ||
691 | static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded) | |
692 | { | |
693 | switch (coded) { | |
694 | case PL080_WIDTH_8BIT: | |
695 | return 1; | |
696 | case PL080_WIDTH_16BIT: | |
697 | return 2; | |
698 | case PL080_WIDTH_32BIT: | |
699 | return 4; | |
700 | default: | |
701 | break; | |
702 | } | |
703 | BUG(); | |
704 | return 0; | |
705 | } | |
706 | ||
707 | static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth, | |
cace6585 | 708 | size_t tsize) |
e8689e63 LW |
709 | { |
710 | u32 retbits = cctl; | |
711 | ||
e8b5e11d | 712 | /* Remove all src, dst and transfer size bits */ |
e8689e63 LW |
713 | retbits &= ~PL080_CONTROL_DWIDTH_MASK; |
714 | retbits &= ~PL080_CONTROL_SWIDTH_MASK; | |
715 | retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK; | |
716 | ||
717 | /* Then set the bits according to the parameters */ | |
718 | switch (srcwidth) { | |
719 | case 1: | |
720 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
721 | break; | |
722 | case 2: | |
723 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
724 | break; | |
725 | case 4: | |
726 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
727 | break; | |
728 | default: | |
729 | BUG(); | |
730 | break; | |
731 | } | |
732 | ||
733 | switch (dstwidth) { | |
734 | case 1: | |
735 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
736 | break; | |
737 | case 2: | |
738 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
739 | break; | |
740 | case 4: | |
741 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
742 | break; | |
743 | default: | |
744 | BUG(); | |
745 | break; | |
746 | } | |
747 | ||
748 | retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT; | |
749 | return retbits; | |
750 | } | |
751 | ||
542361f8 RKAL |
752 | struct pl08x_lli_build_data { |
753 | struct pl08x_txd *txd; | |
542361f8 RKAL |
754 | struct pl08x_bus_data srcbus; |
755 | struct pl08x_bus_data dstbus; | |
756 | size_t remainder; | |
25c94f7f | 757 | u32 lli_bus; |
542361f8 RKAL |
758 | }; |
759 | ||
e8689e63 | 760 | /* |
0532e6fc VK |
761 | * Autoselect a master bus to use for the transfer. Slave will be the chosen as |
762 | * victim in case src & dest are not similarly aligned. i.e. If after aligning | |
763 | * masters address with width requirements of transfer (by sending few byte by | |
764 | * byte data), slave is still not aligned, then its width will be reduced to | |
765 | * BYTE. | |
766 | * - prefers the destination bus if both available | |
036f05fd | 767 | * - prefers bus with fixed address (i.e. peripheral) |
e8689e63 | 768 | */ |
542361f8 RKAL |
769 | static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd, |
770 | struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl) | |
e8689e63 LW |
771 | { |
772 | if (!(cctl & PL080_CONTROL_DST_INCR)) { | |
542361f8 RKAL |
773 | *mbus = &bd->dstbus; |
774 | *sbus = &bd->srcbus; | |
036f05fd VK |
775 | } else if (!(cctl & PL080_CONTROL_SRC_INCR)) { |
776 | *mbus = &bd->srcbus; | |
777 | *sbus = &bd->dstbus; | |
e8689e63 | 778 | } else { |
036f05fd | 779 | if (bd->dstbus.buswidth >= bd->srcbus.buswidth) { |
542361f8 RKAL |
780 | *mbus = &bd->dstbus; |
781 | *sbus = &bd->srcbus; | |
036f05fd | 782 | } else { |
542361f8 RKAL |
783 | *mbus = &bd->srcbus; |
784 | *sbus = &bd->dstbus; | |
e8689e63 LW |
785 | } |
786 | } | |
787 | } | |
788 | ||
789 | /* | |
94ae8522 | 790 | * Fills in one LLI for a certain transfer descriptor and advance the counter |
e8689e63 | 791 | */ |
542361f8 RKAL |
792 | static void pl08x_fill_lli_for_desc(struct pl08x_lli_build_data *bd, |
793 | int num_llis, int len, u32 cctl) | |
e8689e63 | 794 | { |
542361f8 RKAL |
795 | struct pl08x_lli *llis_va = bd->txd->llis_va; |
796 | dma_addr_t llis_bus = bd->txd->llis_bus; | |
e8689e63 LW |
797 | |
798 | BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS); | |
799 | ||
30749cb4 | 800 | llis_va[num_llis].cctl = cctl; |
542361f8 RKAL |
801 | llis_va[num_llis].src = bd->srcbus.addr; |
802 | llis_va[num_llis].dst = bd->dstbus.addr; | |
3e27ee84 VK |
803 | llis_va[num_llis].lli = llis_bus + (num_llis + 1) * |
804 | sizeof(struct pl08x_lli); | |
25c94f7f | 805 | llis_va[num_llis].lli |= bd->lli_bus; |
e8689e63 LW |
806 | |
807 | if (cctl & PL080_CONTROL_SRC_INCR) | |
542361f8 | 808 | bd->srcbus.addr += len; |
e8689e63 | 809 | if (cctl & PL080_CONTROL_DST_INCR) |
542361f8 | 810 | bd->dstbus.addr += len; |
e8689e63 | 811 | |
542361f8 | 812 | BUG_ON(bd->remainder < len); |
cace6585 | 813 | |
542361f8 | 814 | bd->remainder -= len; |
e8689e63 LW |
815 | } |
816 | ||
03af500f VK |
817 | static inline void prep_byte_width_lli(struct pl08x_lli_build_data *bd, |
818 | u32 *cctl, u32 len, int num_llis, size_t *total_bytes) | |
e8689e63 | 819 | { |
03af500f VK |
820 | *cctl = pl08x_cctl_bits(*cctl, 1, 1, len); |
821 | pl08x_fill_lli_for_desc(bd, num_llis, len, *cctl); | |
822 | (*total_bytes) += len; | |
e8689e63 LW |
823 | } |
824 | ||
825 | /* | |
826 | * This fills in the table of LLIs for the transfer descriptor | |
827 | * Note that we assume we never have to change the burst sizes | |
828 | * Return 0 for error | |
829 | */ | |
830 | static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, | |
831 | struct pl08x_txd *txd) | |
832 | { | |
e8689e63 | 833 | struct pl08x_bus_data *mbus, *sbus; |
542361f8 | 834 | struct pl08x_lli_build_data bd; |
e8689e63 | 835 | int num_llis = 0; |
03af500f | 836 | u32 cctl, early_bytes = 0; |
b7f69d9d | 837 | size_t max_bytes_per_lli, total_bytes; |
7cb72ad9 | 838 | struct pl08x_lli *llis_va; |
b7f69d9d | 839 | struct pl08x_sg *dsg; |
e8689e63 | 840 | |
3e27ee84 | 841 | txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus); |
e8689e63 LW |
842 | if (!txd->llis_va) { |
843 | dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__); | |
844 | return 0; | |
845 | } | |
846 | ||
847 | pl08x->pool_ctr++; | |
848 | ||
542361f8 | 849 | bd.txd = txd; |
25c94f7f | 850 | bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0; |
b7f69d9d | 851 | cctl = txd->cctl; |
542361f8 | 852 | |
e8689e63 | 853 | /* Find maximum width of the source bus */ |
542361f8 | 854 | bd.srcbus.maxwidth = |
e8689e63 LW |
855 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >> |
856 | PL080_CONTROL_SWIDTH_SHIFT); | |
857 | ||
858 | /* Find maximum width of the destination bus */ | |
542361f8 | 859 | bd.dstbus.maxwidth = |
e8689e63 LW |
860 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >> |
861 | PL080_CONTROL_DWIDTH_SHIFT); | |
862 | ||
b7f69d9d VK |
863 | list_for_each_entry(dsg, &txd->dsg_list, node) { |
864 | total_bytes = 0; | |
865 | cctl = txd->cctl; | |
e8689e63 | 866 | |
b7f69d9d VK |
867 | bd.srcbus.addr = dsg->src_addr; |
868 | bd.dstbus.addr = dsg->dst_addr; | |
869 | bd.remainder = dsg->len; | |
870 | bd.srcbus.buswidth = bd.srcbus.maxwidth; | |
871 | bd.dstbus.buswidth = bd.dstbus.maxwidth; | |
e8689e63 | 872 | |
b7f69d9d | 873 | pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl); |
e8689e63 | 874 | |
b7f69d9d VK |
875 | dev_vdbg(&pl08x->adev->dev, "src=0x%08x%s/%u dst=0x%08x%s/%u len=%zu\n", |
876 | bd.srcbus.addr, cctl & PL080_CONTROL_SRC_INCR ? "+" : "", | |
877 | bd.srcbus.buswidth, | |
878 | bd.dstbus.addr, cctl & PL080_CONTROL_DST_INCR ? "+" : "", | |
879 | bd.dstbus.buswidth, | |
880 | bd.remainder); | |
881 | dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n", | |
882 | mbus == &bd.srcbus ? "src" : "dst", | |
883 | sbus == &bd.srcbus ? "src" : "dst"); | |
fc74eb79 | 884 | |
b7f69d9d VK |
885 | /* |
886 | * Zero length is only allowed if all these requirements are | |
887 | * met: | |
888 | * - flow controller is peripheral. | |
889 | * - src.addr is aligned to src.width | |
890 | * - dst.addr is aligned to dst.width | |
891 | * | |
892 | * sg_len == 1 should be true, as there can be two cases here: | |
893 | * | |
894 | * - Memory addresses are contiguous and are not scattered. | |
895 | * Here, Only one sg will be passed by user driver, with | |
896 | * memory address and zero length. We pass this to controller | |
897 | * and after the transfer it will receive the last burst | |
898 | * request from peripheral and so transfer finishes. | |
899 | * | |
900 | * - Memory addresses are scattered and are not contiguous. | |
901 | * Here, Obviously as DMA controller doesn't know when a lli's | |
902 | * transfer gets over, it can't load next lli. So in this | |
903 | * case, there has to be an assumption that only one lli is | |
904 | * supported. Thus, we can't have scattered addresses. | |
905 | */ | |
906 | if (!bd.remainder) { | |
907 | u32 fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >> | |
908 | PL080_CONFIG_FLOW_CONTROL_SHIFT; | |
909 | if (!((fc >= PL080_FLOW_SRC2DST_DST) && | |
0a235657 | 910 | (fc <= PL080_FLOW_SRC2DST_SRC))) { |
b7f69d9d VK |
911 | dev_err(&pl08x->adev->dev, "%s sg len can't be zero", |
912 | __func__); | |
913 | return 0; | |
914 | } | |
0a235657 | 915 | |
b7f69d9d | 916 | if ((bd.srcbus.addr % bd.srcbus.buswidth) || |
880db3ff | 917 | (bd.dstbus.addr % bd.dstbus.buswidth)) { |
b7f69d9d VK |
918 | dev_err(&pl08x->adev->dev, |
919 | "%s src & dst address must be aligned to src" | |
920 | " & dst width if peripheral is flow controller", | |
921 | __func__); | |
922 | return 0; | |
923 | } | |
03af500f | 924 | |
b7f69d9d VK |
925 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, |
926 | bd.dstbus.buswidth, 0); | |
927 | pl08x_fill_lli_for_desc(&bd, num_llis++, 0, cctl); | |
928 | break; | |
929 | } | |
e8689e63 LW |
930 | |
931 | /* | |
b7f69d9d VK |
932 | * Send byte by byte for following cases |
933 | * - Less than a bus width available | |
934 | * - until master bus is aligned | |
e8689e63 | 935 | */ |
b7f69d9d VK |
936 | if (bd.remainder < mbus->buswidth) |
937 | early_bytes = bd.remainder; | |
938 | else if ((mbus->addr) % (mbus->buswidth)) { | |
939 | early_bytes = mbus->buswidth - (mbus->addr) % | |
940 | (mbus->buswidth); | |
941 | if ((bd.remainder - early_bytes) < mbus->buswidth) | |
942 | early_bytes = bd.remainder; | |
943 | } | |
e8689e63 | 944 | |
b7f69d9d VK |
945 | if (early_bytes) { |
946 | dev_vdbg(&pl08x->adev->dev, | |
947 | "%s byte width LLIs (remain 0x%08x)\n", | |
948 | __func__, bd.remainder); | |
949 | prep_byte_width_lli(&bd, &cctl, early_bytes, num_llis++, | |
950 | &total_bytes); | |
e8689e63 LW |
951 | } |
952 | ||
b7f69d9d VK |
953 | if (bd.remainder) { |
954 | /* | |
955 | * Master now aligned | |
956 | * - if slave is not then we must set its width down | |
957 | */ | |
958 | if (sbus->addr % sbus->buswidth) { | |
959 | dev_dbg(&pl08x->adev->dev, | |
960 | "%s set down bus width to one byte\n", | |
961 | __func__); | |
fa6a940b | 962 | |
b7f69d9d VK |
963 | sbus->buswidth = 1; |
964 | } | |
e8689e63 LW |
965 | |
966 | /* | |
b7f69d9d VK |
967 | * Bytes transferred = tsize * src width, not |
968 | * MIN(buswidths) | |
e8689e63 | 969 | */ |
b7f69d9d VK |
970 | max_bytes_per_lli = bd.srcbus.buswidth * |
971 | PL080_CONTROL_TRANSFER_SIZE_MASK; | |
972 | dev_vdbg(&pl08x->adev->dev, | |
973 | "%s max bytes per lli = %zu\n", | |
974 | __func__, max_bytes_per_lli); | |
e8689e63 LW |
975 | |
976 | /* | |
b7f69d9d VK |
977 | * Make largest possible LLIs until less than one bus |
978 | * width left | |
e8689e63 | 979 | */ |
b7f69d9d VK |
980 | while (bd.remainder > (mbus->buswidth - 1)) { |
981 | size_t lli_len, tsize, width; | |
e8689e63 | 982 | |
b7f69d9d VK |
983 | /* |
984 | * If enough left try to send max possible, | |
985 | * otherwise try to send the remainder | |
986 | */ | |
987 | lli_len = min(bd.remainder, max_bytes_per_lli); | |
16a2e7d3 | 988 | |
b7f69d9d VK |
989 | /* |
990 | * Check against maximum bus alignment: | |
991 | * Calculate actual transfer size in relation to | |
992 | * bus width an get a maximum remainder of the | |
993 | * highest bus width - 1 | |
994 | */ | |
995 | width = max(mbus->buswidth, sbus->buswidth); | |
996 | lli_len = (lli_len / width) * width; | |
997 | tsize = lli_len / bd.srcbus.buswidth; | |
998 | ||
999 | dev_vdbg(&pl08x->adev->dev, | |
1000 | "%s fill lli with single lli chunk of " | |
1001 | "size 0x%08zx (remainder 0x%08zx)\n", | |
1002 | __func__, lli_len, bd.remainder); | |
1003 | ||
1004 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, | |
16a2e7d3 | 1005 | bd.dstbus.buswidth, tsize); |
b7f69d9d VK |
1006 | pl08x_fill_lli_for_desc(&bd, num_llis++, |
1007 | lli_len, cctl); | |
1008 | total_bytes += lli_len; | |
1009 | } | |
e8689e63 | 1010 | |
b7f69d9d VK |
1011 | /* |
1012 | * Send any odd bytes | |
1013 | */ | |
1014 | if (bd.remainder) { | |
1015 | dev_vdbg(&pl08x->adev->dev, | |
1016 | "%s align with boundary, send odd bytes (remain %zu)\n", | |
1017 | __func__, bd.remainder); | |
1018 | prep_byte_width_lli(&bd, &cctl, bd.remainder, | |
1019 | num_llis++, &total_bytes); | |
1020 | } | |
e8689e63 | 1021 | } |
16a2e7d3 | 1022 | |
b7f69d9d VK |
1023 | if (total_bytes != dsg->len) { |
1024 | dev_err(&pl08x->adev->dev, | |
1025 | "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n", | |
1026 | __func__, total_bytes, dsg->len); | |
1027 | return 0; | |
1028 | } | |
e8689e63 | 1029 | |
b7f69d9d VK |
1030 | if (num_llis >= MAX_NUM_TSFR_LLIS) { |
1031 | dev_err(&pl08x->adev->dev, | |
1032 | "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n", | |
1033 | __func__, (u32) MAX_NUM_TSFR_LLIS); | |
1034 | return 0; | |
1035 | } | |
e8689e63 | 1036 | } |
b58b6b5b RKAL |
1037 | |
1038 | llis_va = txd->llis_va; | |
94ae8522 | 1039 | /* The final LLI terminates the LLI. */ |
bfddfb45 | 1040 | llis_va[num_llis - 1].lli = 0; |
94ae8522 | 1041 | /* The final LLI element shall also fire an interrupt. */ |
b58b6b5b | 1042 | llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN; |
e8689e63 | 1043 | |
e8689e63 LW |
1044 | #ifdef VERBOSE_DEBUG |
1045 | { | |
1046 | int i; | |
1047 | ||
fc74eb79 RKAL |
1048 | dev_vdbg(&pl08x->adev->dev, |
1049 | "%-3s %-9s %-10s %-10s %-10s %s\n", | |
1050 | "lli", "", "csrc", "cdst", "clli", "cctl"); | |
e8689e63 LW |
1051 | for (i = 0; i < num_llis; i++) { |
1052 | dev_vdbg(&pl08x->adev->dev, | |
fc74eb79 RKAL |
1053 | "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n", |
1054 | i, &llis_va[i], llis_va[i].src, | |
1055 | llis_va[i].dst, llis_va[i].lli, llis_va[i].cctl | |
e8689e63 LW |
1056 | ); |
1057 | } | |
1058 | } | |
1059 | #endif | |
1060 | ||
1061 | return num_llis; | |
1062 | } | |
1063 | ||
1064 | /* You should call this with the struct pl08x lock held */ | |
1065 | static void pl08x_free_txd(struct pl08x_driver_data *pl08x, | |
1066 | struct pl08x_txd *txd) | |
1067 | { | |
b7f69d9d VK |
1068 | struct pl08x_sg *dsg, *_dsg; |
1069 | ||
e8689e63 | 1070 | /* Free the LLI */ |
c1205646 VK |
1071 | if (txd->llis_va) |
1072 | dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus); | |
e8689e63 LW |
1073 | |
1074 | pl08x->pool_ctr--; | |
1075 | ||
b7f69d9d VK |
1076 | list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) { |
1077 | list_del(&dsg->node); | |
1078 | kfree(dsg); | |
1079 | } | |
1080 | ||
e8689e63 LW |
1081 | kfree(txd); |
1082 | } | |
1083 | ||
18536134 RK |
1084 | static void pl08x_unmap_buffers(struct pl08x_txd *txd) |
1085 | { | |
1086 | struct device *dev = txd->vd.tx.chan->device->dev; | |
1087 | struct pl08x_sg *dsg; | |
1088 | ||
1089 | if (!(txd->vd.tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { | |
1090 | if (txd->vd.tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE) | |
1091 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
1092 | dma_unmap_single(dev, dsg->src_addr, dsg->len, | |
1093 | DMA_TO_DEVICE); | |
1094 | else { | |
1095 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
1096 | dma_unmap_page(dev, dsg->src_addr, dsg->len, | |
1097 | DMA_TO_DEVICE); | |
1098 | } | |
1099 | } | |
1100 | if (!(txd->vd.tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { | |
1101 | if (txd->vd.tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE) | |
1102 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
1103 | dma_unmap_single(dev, dsg->dst_addr, dsg->len, | |
1104 | DMA_FROM_DEVICE); | |
1105 | else | |
1106 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
1107 | dma_unmap_page(dev, dsg->dst_addr, dsg->len, | |
1108 | DMA_FROM_DEVICE); | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | static void pl08x_desc_free(struct virt_dma_desc *vd) | |
1113 | { | |
1114 | struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); | |
1115 | struct pl08x_dma_chan *plchan = to_pl08x_chan(vd->tx.chan); | |
1116 | struct pl08x_driver_data *pl08x = plchan->host; | |
1117 | unsigned long flags; | |
1118 | ||
1119 | if (!plchan->slave) | |
1120 | pl08x_unmap_buffers(txd); | |
1121 | ||
1122 | if (!txd->done) | |
1123 | pl08x_release_mux(plchan); | |
1124 | ||
1125 | spin_lock_irqsave(&pl08x->lock, flags); | |
1126 | pl08x_free_txd(plchan->host, txd); | |
1127 | spin_unlock_irqrestore(&pl08x->lock, flags); | |
1128 | } | |
1129 | ||
e8689e63 LW |
1130 | static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, |
1131 | struct pl08x_dma_chan *plchan) | |
1132 | { | |
ea160561 RK |
1133 | LIST_HEAD(head); |
1134 | struct pl08x_txd *txd; | |
e8689e63 | 1135 | |
879f127b | 1136 | vchan_get_all_descriptors(&plchan->vc, &head); |
ea160561 RK |
1137 | |
1138 | while (!list_empty(&head)) { | |
879f127b | 1139 | txd = list_first_entry(&head, struct pl08x_txd, vd.node); |
879f127b | 1140 | list_del(&txd->vd.node); |
18536134 | 1141 | pl08x_desc_free(&txd->vd); |
e8689e63 LW |
1142 | } |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * The DMA ENGINE API | |
1147 | */ | |
1148 | static int pl08x_alloc_chan_resources(struct dma_chan *chan) | |
1149 | { | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static void pl08x_free_chan_resources(struct dma_chan *chan) | |
1154 | { | |
1155 | } | |
1156 | ||
e8689e63 LW |
1157 | static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt( |
1158 | struct dma_chan *chan, unsigned long flags) | |
1159 | { | |
1160 | struct dma_async_tx_descriptor *retval = NULL; | |
1161 | ||
1162 | return retval; | |
1163 | } | |
1164 | ||
1165 | /* | |
94ae8522 RKAL |
1166 | * Code accessing dma_async_is_complete() in a tight loop may give problems. |
1167 | * If slaves are relying on interrupts to signal completion this function | |
1168 | * must not be called with interrupts disabled. | |
e8689e63 | 1169 | */ |
3e27ee84 VK |
1170 | static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan, |
1171 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
e8689e63 LW |
1172 | { |
1173 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
e8689e63 | 1174 | enum dma_status ret; |
e8689e63 | 1175 | |
96a2af41 RKAL |
1176 | ret = dma_cookie_status(chan, cookie, txstate); |
1177 | if (ret == DMA_SUCCESS) | |
e8689e63 | 1178 | return ret; |
e8689e63 | 1179 | |
e8689e63 LW |
1180 | /* |
1181 | * This cookie not complete yet | |
96a2af41 | 1182 | * Get number of bytes left in the active transactions and queue |
e8689e63 | 1183 | */ |
96a2af41 | 1184 | dma_set_residue(txstate, pl08x_getbytes_chan(plchan)); |
e8689e63 LW |
1185 | |
1186 | if (plchan->state == PL08X_CHAN_PAUSED) | |
1187 | return DMA_PAUSED; | |
1188 | ||
1189 | /* Whether waiting or running, we're in progress */ | |
1190 | return DMA_IN_PROGRESS; | |
1191 | } | |
1192 | ||
1193 | /* PrimeCell DMA extension */ | |
1194 | struct burst_table { | |
760596c6 | 1195 | u32 burstwords; |
e8689e63 LW |
1196 | u32 reg; |
1197 | }; | |
1198 | ||
1199 | static const struct burst_table burst_sizes[] = { | |
1200 | { | |
1201 | .burstwords = 256, | |
760596c6 | 1202 | .reg = PL080_BSIZE_256, |
e8689e63 LW |
1203 | }, |
1204 | { | |
1205 | .burstwords = 128, | |
760596c6 | 1206 | .reg = PL080_BSIZE_128, |
e8689e63 LW |
1207 | }, |
1208 | { | |
1209 | .burstwords = 64, | |
760596c6 | 1210 | .reg = PL080_BSIZE_64, |
e8689e63 LW |
1211 | }, |
1212 | { | |
1213 | .burstwords = 32, | |
760596c6 | 1214 | .reg = PL080_BSIZE_32, |
e8689e63 LW |
1215 | }, |
1216 | { | |
1217 | .burstwords = 16, | |
760596c6 | 1218 | .reg = PL080_BSIZE_16, |
e8689e63 LW |
1219 | }, |
1220 | { | |
1221 | .burstwords = 8, | |
760596c6 | 1222 | .reg = PL080_BSIZE_8, |
e8689e63 LW |
1223 | }, |
1224 | { | |
1225 | .burstwords = 4, | |
760596c6 | 1226 | .reg = PL080_BSIZE_4, |
e8689e63 LW |
1227 | }, |
1228 | { | |
760596c6 RKAL |
1229 | .burstwords = 0, |
1230 | .reg = PL080_BSIZE_1, | |
e8689e63 LW |
1231 | }, |
1232 | }; | |
1233 | ||
121c8476 RKAL |
1234 | /* |
1235 | * Given the source and destination available bus masks, select which | |
1236 | * will be routed to each port. We try to have source and destination | |
1237 | * on separate ports, but always respect the allowable settings. | |
1238 | */ | |
1239 | static u32 pl08x_select_bus(u8 src, u8 dst) | |
1240 | { | |
1241 | u32 cctl = 0; | |
1242 | ||
1243 | if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1))) | |
1244 | cctl |= PL080_CONTROL_DST_AHB2; | |
1245 | if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2))) | |
1246 | cctl |= PL080_CONTROL_SRC_AHB2; | |
1247 | ||
1248 | return cctl; | |
1249 | } | |
1250 | ||
f14c426c RKAL |
1251 | static u32 pl08x_cctl(u32 cctl) |
1252 | { | |
1253 | cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 | | |
1254 | PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR | | |
1255 | PL080_CONTROL_PROT_MASK); | |
1256 | ||
1257 | /* Access the cell in privileged mode, non-bufferable, non-cacheable */ | |
1258 | return cctl | PL080_CONTROL_PROT_SYS; | |
1259 | } | |
1260 | ||
aa88cdaa RKAL |
1261 | static u32 pl08x_width(enum dma_slave_buswidth width) |
1262 | { | |
1263 | switch (width) { | |
1264 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
1265 | return PL080_WIDTH_8BIT; | |
1266 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
1267 | return PL080_WIDTH_16BIT; | |
1268 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
1269 | return PL080_WIDTH_32BIT; | |
f32807f1 VK |
1270 | default: |
1271 | return ~0; | |
aa88cdaa | 1272 | } |
aa88cdaa RKAL |
1273 | } |
1274 | ||
760596c6 RKAL |
1275 | static u32 pl08x_burst(u32 maxburst) |
1276 | { | |
1277 | int i; | |
1278 | ||
1279 | for (i = 0; i < ARRAY_SIZE(burst_sizes); i++) | |
1280 | if (burst_sizes[i].burstwords <= maxburst) | |
1281 | break; | |
1282 | ||
1283 | return burst_sizes[i].reg; | |
1284 | } | |
1285 | ||
9862ba17 RK |
1286 | static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan, |
1287 | enum dma_slave_buswidth addr_width, u32 maxburst) | |
1288 | { | |
1289 | u32 width, burst, cctl = 0; | |
1290 | ||
1291 | width = pl08x_width(addr_width); | |
1292 | if (width == ~0) | |
1293 | return ~0; | |
1294 | ||
1295 | cctl |= width << PL080_CONTROL_SWIDTH_SHIFT; | |
1296 | cctl |= width << PL080_CONTROL_DWIDTH_SHIFT; | |
1297 | ||
1298 | /* | |
1299 | * If this channel will only request single transfers, set this | |
1300 | * down to ONE element. Also select one element if no maxburst | |
1301 | * is specified. | |
1302 | */ | |
1303 | if (plchan->cd->single) | |
1304 | maxburst = 1; | |
1305 | ||
1306 | burst = pl08x_burst(maxburst); | |
1307 | cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT; | |
1308 | cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT; | |
1309 | ||
1310 | return pl08x_cctl(cctl); | |
1311 | } | |
1312 | ||
f0fd9446 RKAL |
1313 | static int dma_set_runtime_config(struct dma_chan *chan, |
1314 | struct dma_slave_config *config) | |
e8689e63 LW |
1315 | { |
1316 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
b7f75865 RKAL |
1317 | |
1318 | if (!plchan->slave) | |
1319 | return -EINVAL; | |
e8689e63 | 1320 | |
dc8d5f8d RK |
1321 | /* Reject definitely invalid configurations */ |
1322 | if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || | |
1323 | config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) | |
f0fd9446 | 1324 | return -EINVAL; |
e8689e63 | 1325 | |
ed91c13d RK |
1326 | plchan->cfg = *config; |
1327 | ||
f0fd9446 | 1328 | return 0; |
e8689e63 LW |
1329 | } |
1330 | ||
1331 | /* | |
1332 | * Slave transactions callback to the slave device to allow | |
1333 | * synchronization of slave DMA signals with the DMAC enable | |
1334 | */ | |
1335 | static void pl08x_issue_pending(struct dma_chan *chan) | |
1336 | { | |
1337 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
e8689e63 LW |
1338 | unsigned long flags; |
1339 | ||
083be28a | 1340 | spin_lock_irqsave(&plchan->vc.lock, flags); |
879f127b | 1341 | if (vchan_issue_pending(&plchan->vc)) { |
a5a488db RK |
1342 | if (!plchan->phychan && plchan->state != PL08X_CHAN_WAITING) |
1343 | pl08x_phy_alloc_and_start(plchan); | |
e8689e63 | 1344 | } |
083be28a | 1345 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
e8689e63 LW |
1346 | } |
1347 | ||
1348 | static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan, | |
1349 | struct pl08x_txd *txd) | |
1350 | { | |
e8689e63 | 1351 | struct pl08x_driver_data *pl08x = plchan->host; |
a5a488db | 1352 | int num_llis; |
e8689e63 LW |
1353 | |
1354 | num_llis = pl08x_fill_llis_for_desc(pl08x, txd); | |
dafa7317 | 1355 | if (!num_llis) { |
a5a488db RK |
1356 | unsigned long flags; |
1357 | ||
083be28a | 1358 | spin_lock_irqsave(&plchan->vc.lock, flags); |
57001a60 | 1359 | pl08x_free_txd(pl08x, txd); |
083be28a | 1360 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
a5a488db | 1361 | |
e8689e63 | 1362 | return -EINVAL; |
dafa7317 | 1363 | } |
e8689e63 LW |
1364 | return 0; |
1365 | } | |
1366 | ||
879f127b | 1367 | static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan) |
ac3cd20d | 1368 | { |
b201c111 | 1369 | struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT); |
ac3cd20d RKAL |
1370 | |
1371 | if (txd) { | |
b7f69d9d | 1372 | INIT_LIST_HEAD(&txd->dsg_list); |
4983a04f RKAL |
1373 | |
1374 | /* Always enable error and terminal interrupts */ | |
1375 | txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK | | |
1376 | PL080_CONFIG_TC_IRQ_MASK; | |
ac3cd20d RKAL |
1377 | } |
1378 | return txd; | |
1379 | } | |
1380 | ||
e8689e63 LW |
1381 | /* |
1382 | * Initialize a descriptor to be used by memcpy submit | |
1383 | */ | |
1384 | static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( | |
1385 | struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
1386 | size_t len, unsigned long flags) | |
1387 | { | |
1388 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1389 | struct pl08x_driver_data *pl08x = plchan->host; | |
1390 | struct pl08x_txd *txd; | |
b7f69d9d | 1391 | struct pl08x_sg *dsg; |
e8689e63 LW |
1392 | int ret; |
1393 | ||
879f127b | 1394 | txd = pl08x_get_txd(plchan); |
e8689e63 LW |
1395 | if (!txd) { |
1396 | dev_err(&pl08x->adev->dev, | |
1397 | "%s no memory for descriptor\n", __func__); | |
1398 | return NULL; | |
1399 | } | |
1400 | ||
b7f69d9d VK |
1401 | dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); |
1402 | if (!dsg) { | |
1403 | pl08x_free_txd(pl08x, txd); | |
1404 | dev_err(&pl08x->adev->dev, "%s no memory for pl080 sg\n", | |
1405 | __func__); | |
1406 | return NULL; | |
1407 | } | |
1408 | list_add_tail(&dsg->node, &txd->dsg_list); | |
1409 | ||
b7f69d9d VK |
1410 | dsg->src_addr = src; |
1411 | dsg->dst_addr = dest; | |
1412 | dsg->len = len; | |
e8689e63 LW |
1413 | |
1414 | /* Set platform data for m2m */ | |
4983a04f | 1415 | txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT; |
dc8d5f8d | 1416 | txd->cctl = pl08x->pd->memcpy_channel.cctl_memcpy & |
c7da9a56 | 1417 | ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2); |
4983a04f | 1418 | |
e8689e63 | 1419 | /* Both to be incremented or the code will break */ |
70b5ed6b | 1420 | txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR; |
c7da9a56 | 1421 | |
c7da9a56 | 1422 | if (pl08x->vd->dualmaster) |
121c8476 RKAL |
1423 | txd->cctl |= pl08x_select_bus(pl08x->mem_buses, |
1424 | pl08x->mem_buses); | |
e8689e63 | 1425 | |
e8689e63 LW |
1426 | ret = pl08x_prep_channel_resources(plchan, txd); |
1427 | if (ret) | |
1428 | return NULL; | |
e8689e63 | 1429 | |
879f127b | 1430 | return vchan_tx_prep(&plchan->vc, &txd->vd, flags); |
e8689e63 LW |
1431 | } |
1432 | ||
3e2a037c | 1433 | static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( |
e8689e63 | 1434 | struct dma_chan *chan, struct scatterlist *sgl, |
db8196df | 1435 | unsigned int sg_len, enum dma_transfer_direction direction, |
185ecb5f | 1436 | unsigned long flags, void *context) |
e8689e63 LW |
1437 | { |
1438 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1439 | struct pl08x_driver_data *pl08x = plchan->host; | |
1440 | struct pl08x_txd *txd; | |
b7f69d9d VK |
1441 | struct pl08x_sg *dsg; |
1442 | struct scatterlist *sg; | |
dc8d5f8d | 1443 | enum dma_slave_buswidth addr_width; |
b7f69d9d | 1444 | dma_addr_t slave_addr; |
0a235657 | 1445 | int ret, tmp; |
409ec8db | 1446 | u8 src_buses, dst_buses; |
dc8d5f8d | 1447 | u32 maxburst, cctl; |
e8689e63 | 1448 | |
e8689e63 | 1449 | dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n", |
fdaf9c4b | 1450 | __func__, sg_dma_len(sgl), plchan->name); |
e8689e63 | 1451 | |
879f127b | 1452 | txd = pl08x_get_txd(plchan); |
e8689e63 LW |
1453 | if (!txd) { |
1454 | dev_err(&pl08x->adev->dev, "%s no txd\n", __func__); | |
1455 | return NULL; | |
1456 | } | |
1457 | ||
e8689e63 LW |
1458 | /* |
1459 | * Set up addresses, the PrimeCell configured address | |
1460 | * will take precedence since this may configure the | |
1461 | * channel target address dynamically at runtime. | |
1462 | */ | |
db8196df | 1463 | if (direction == DMA_MEM_TO_DEV) { |
dc8d5f8d | 1464 | cctl = PL080_CONTROL_SRC_INCR; |
ed91c13d | 1465 | slave_addr = plchan->cfg.dst_addr; |
dc8d5f8d RK |
1466 | addr_width = plchan->cfg.dst_addr_width; |
1467 | maxburst = plchan->cfg.dst_maxburst; | |
409ec8db RK |
1468 | src_buses = pl08x->mem_buses; |
1469 | dst_buses = plchan->cd->periph_buses; | |
db8196df | 1470 | } else if (direction == DMA_DEV_TO_MEM) { |
dc8d5f8d | 1471 | cctl = PL080_CONTROL_DST_INCR; |
ed91c13d | 1472 | slave_addr = plchan->cfg.src_addr; |
dc8d5f8d RK |
1473 | addr_width = plchan->cfg.src_addr_width; |
1474 | maxburst = plchan->cfg.src_maxburst; | |
409ec8db RK |
1475 | src_buses = plchan->cd->periph_buses; |
1476 | dst_buses = pl08x->mem_buses; | |
e8689e63 | 1477 | } else { |
b7f69d9d | 1478 | pl08x_free_txd(pl08x, txd); |
e8689e63 LW |
1479 | dev_err(&pl08x->adev->dev, |
1480 | "%s direction unsupported\n", __func__); | |
1481 | return NULL; | |
1482 | } | |
e8689e63 | 1483 | |
dc8d5f8d | 1484 | cctl |= pl08x_get_cctl(plchan, addr_width, maxburst); |
800d683e RK |
1485 | if (cctl == ~0) { |
1486 | pl08x_free_txd(pl08x, txd); | |
1487 | dev_err(&pl08x->adev->dev, | |
1488 | "DMA slave configuration botched?\n"); | |
1489 | return NULL; | |
1490 | } | |
1491 | ||
409ec8db RK |
1492 | txd->cctl = cctl | pl08x_select_bus(src_buses, dst_buses); |
1493 | ||
95442b22 | 1494 | if (plchan->cfg.device_fc) |
db8196df | 1495 | tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER_PER : |
0a235657 VK |
1496 | PL080_FLOW_PER2MEM_PER; |
1497 | else | |
db8196df | 1498 | tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER : |
0a235657 VK |
1499 | PL080_FLOW_PER2MEM; |
1500 | ||
1501 | txd->ccfg |= tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT; | |
1502 | ||
c48d4963 RK |
1503 | ret = pl08x_request_mux(plchan); |
1504 | if (ret < 0) { | |
1505 | pl08x_free_txd(pl08x, txd); | |
1506 | dev_dbg(&pl08x->adev->dev, | |
1507 | "unable to mux for transfer on %s due to platform restrictions\n", | |
1508 | plchan->name); | |
1509 | return NULL; | |
1510 | } | |
1511 | ||
1512 | dev_dbg(&pl08x->adev->dev, "allocated DMA request signal %d for xfer on %s\n", | |
1513 | plchan->signal, plchan->name); | |
1514 | ||
1515 | /* Assign the flow control signal to this channel */ | |
1516 | if (direction == DMA_MEM_TO_DEV) | |
1517 | txd->ccfg |= plchan->signal << PL080_CONFIG_DST_SEL_SHIFT; | |
1518 | else | |
1519 | txd->ccfg |= plchan->signal << PL080_CONFIG_SRC_SEL_SHIFT; | |
1520 | ||
b7f69d9d VK |
1521 | for_each_sg(sgl, sg, sg_len, tmp) { |
1522 | dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); | |
1523 | if (!dsg) { | |
c48d4963 | 1524 | pl08x_release_mux(plchan); |
b7f69d9d VK |
1525 | pl08x_free_txd(pl08x, txd); |
1526 | dev_err(&pl08x->adev->dev, "%s no mem for pl080 sg\n", | |
1527 | __func__); | |
1528 | return NULL; | |
1529 | } | |
1530 | list_add_tail(&dsg->node, &txd->dsg_list); | |
1531 | ||
1532 | dsg->len = sg_dma_len(sg); | |
db8196df | 1533 | if (direction == DMA_MEM_TO_DEV) { |
cbb796cc | 1534 | dsg->src_addr = sg_dma_address(sg); |
b7f69d9d VK |
1535 | dsg->dst_addr = slave_addr; |
1536 | } else { | |
1537 | dsg->src_addr = slave_addr; | |
cbb796cc | 1538 | dsg->dst_addr = sg_dma_address(sg); |
b7f69d9d VK |
1539 | } |
1540 | } | |
1541 | ||
e8689e63 LW |
1542 | ret = pl08x_prep_channel_resources(plchan, txd); |
1543 | if (ret) | |
1544 | return NULL; | |
e8689e63 | 1545 | |
879f127b | 1546 | return vchan_tx_prep(&plchan->vc, &txd->vd, flags); |
e8689e63 LW |
1547 | } |
1548 | ||
1549 | static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
1550 | unsigned long arg) | |
1551 | { | |
1552 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1553 | struct pl08x_driver_data *pl08x = plchan->host; | |
1554 | unsigned long flags; | |
1555 | int ret = 0; | |
1556 | ||
1557 | /* Controls applicable to inactive channels */ | |
1558 | if (cmd == DMA_SLAVE_CONFIG) { | |
f0fd9446 RKAL |
1559 | return dma_set_runtime_config(chan, |
1560 | (struct dma_slave_config *)arg); | |
e8689e63 LW |
1561 | } |
1562 | ||
1563 | /* | |
1564 | * Anything succeeds on channels with no physical allocation and | |
1565 | * no queued transfers. | |
1566 | */ | |
083be28a | 1567 | spin_lock_irqsave(&plchan->vc.lock, flags); |
e8689e63 | 1568 | if (!plchan->phychan && !plchan->at) { |
083be28a | 1569 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
e8689e63 LW |
1570 | return 0; |
1571 | } | |
1572 | ||
1573 | switch (cmd) { | |
1574 | case DMA_TERMINATE_ALL: | |
1575 | plchan->state = PL08X_CHAN_IDLE; | |
1576 | ||
1577 | if (plchan->phychan) { | |
e8689e63 LW |
1578 | /* |
1579 | * Mark physical channel as free and free any slave | |
1580 | * signal | |
1581 | */ | |
a5a488db | 1582 | pl08x_phy_free(plchan); |
e8689e63 | 1583 | } |
e8689e63 LW |
1584 | /* Dequeue jobs and free LLIs */ |
1585 | if (plchan->at) { | |
18536134 | 1586 | pl08x_desc_free(&plchan->at->vd); |
e8689e63 LW |
1587 | plchan->at = NULL; |
1588 | } | |
1589 | /* Dequeue jobs not yet fired as well */ | |
1590 | pl08x_free_txd_list(pl08x, plchan); | |
1591 | break; | |
1592 | case DMA_PAUSE: | |
1593 | pl08x_pause_phy_chan(plchan->phychan); | |
1594 | plchan->state = PL08X_CHAN_PAUSED; | |
1595 | break; | |
1596 | case DMA_RESUME: | |
1597 | pl08x_resume_phy_chan(plchan->phychan); | |
1598 | plchan->state = PL08X_CHAN_RUNNING; | |
1599 | break; | |
1600 | default: | |
1601 | /* Unknown command */ | |
1602 | ret = -ENXIO; | |
1603 | break; | |
1604 | } | |
1605 | ||
083be28a | 1606 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
e8689e63 LW |
1607 | |
1608 | return ret; | |
1609 | } | |
1610 | ||
1611 | bool pl08x_filter_id(struct dma_chan *chan, void *chan_id) | |
1612 | { | |
7703eac9 | 1613 | struct pl08x_dma_chan *plchan; |
e8689e63 LW |
1614 | char *name = chan_id; |
1615 | ||
7703eac9 RKAL |
1616 | /* Reject channels for devices not bound to this driver */ |
1617 | if (chan->device->dev->driver != &pl08x_amba_driver.drv) | |
1618 | return false; | |
1619 | ||
1620 | plchan = to_pl08x_chan(chan); | |
1621 | ||
e8689e63 LW |
1622 | /* Check that the channel is not taken! */ |
1623 | if (!strcmp(plchan->name, name)) | |
1624 | return true; | |
1625 | ||
1626 | return false; | |
1627 | } | |
1628 | ||
1629 | /* | |
1630 | * Just check that the device is there and active | |
94ae8522 RKAL |
1631 | * TODO: turn this bit on/off depending on the number of physical channels |
1632 | * actually used, if it is zero... well shut it off. That will save some | |
1633 | * power. Cut the clock at the same time. | |
e8689e63 LW |
1634 | */ |
1635 | static void pl08x_ensure_on(struct pl08x_driver_data *pl08x) | |
1636 | { | |
affa115e LW |
1637 | /* The Nomadik variant does not have the config register */ |
1638 | if (pl08x->vd->nomadik) | |
1639 | return; | |
48a59ef3 | 1640 | writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG); |
e8689e63 LW |
1641 | } |
1642 | ||
e8689e63 LW |
1643 | static irqreturn_t pl08x_irq(int irq, void *dev) |
1644 | { | |
1645 | struct pl08x_driver_data *pl08x = dev; | |
28da2836 VK |
1646 | u32 mask = 0, err, tc, i; |
1647 | ||
1648 | /* check & clear - ERR & TC interrupts */ | |
1649 | err = readl(pl08x->base + PL080_ERR_STATUS); | |
1650 | if (err) { | |
1651 | dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n", | |
1652 | __func__, err); | |
1653 | writel(err, pl08x->base + PL080_ERR_CLEAR); | |
e8689e63 | 1654 | } |
d29bf019 | 1655 | tc = readl(pl08x->base + PL080_TC_STATUS); |
28da2836 VK |
1656 | if (tc) |
1657 | writel(tc, pl08x->base + PL080_TC_CLEAR); | |
1658 | ||
1659 | if (!err && !tc) | |
1660 | return IRQ_NONE; | |
1661 | ||
e8689e63 | 1662 | for (i = 0; i < pl08x->vd->channels; i++) { |
28da2836 | 1663 | if (((1 << i) & err) || ((1 << i) & tc)) { |
e8689e63 LW |
1664 | /* Locate physical channel */ |
1665 | struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i]; | |
1666 | struct pl08x_dma_chan *plchan = phychan->serving; | |
a936e793 | 1667 | struct pl08x_txd *tx; |
e8689e63 | 1668 | |
28da2836 VK |
1669 | if (!plchan) { |
1670 | dev_err(&pl08x->adev->dev, | |
1671 | "%s Error TC interrupt on unused channel: 0x%08x\n", | |
1672 | __func__, i); | |
1673 | continue; | |
1674 | } | |
1675 | ||
083be28a | 1676 | spin_lock(&plchan->vc.lock); |
a936e793 RK |
1677 | tx = plchan->at; |
1678 | if (tx) { | |
1679 | plchan->at = NULL; | |
c48d4963 RK |
1680 | /* |
1681 | * This descriptor is done, release its mux | |
1682 | * reservation. | |
1683 | */ | |
1684 | pl08x_release_mux(plchan); | |
18536134 RK |
1685 | tx->done = true; |
1686 | vchan_cookie_complete(&tx->vd); | |
c33b644c | 1687 | |
a5a488db RK |
1688 | /* |
1689 | * And start the next descriptor (if any), | |
1690 | * otherwise free this channel. | |
1691 | */ | |
879f127b | 1692 | if (vchan_next_desc(&plchan->vc)) |
c33b644c | 1693 | pl08x_start_next_txd(plchan); |
a5a488db RK |
1694 | else |
1695 | pl08x_phy_free(plchan); | |
a936e793 | 1696 | } |
083be28a | 1697 | spin_unlock(&plchan->vc.lock); |
a936e793 | 1698 | |
e8689e63 LW |
1699 | mask |= (1 << i); |
1700 | } | |
1701 | } | |
e8689e63 LW |
1702 | |
1703 | return mask ? IRQ_HANDLED : IRQ_NONE; | |
1704 | } | |
1705 | ||
121c8476 RKAL |
1706 | static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan) |
1707 | { | |
121c8476 RKAL |
1708 | chan->slave = true; |
1709 | chan->name = chan->cd->bus_id; | |
ed91c13d RK |
1710 | chan->cfg.src_addr = chan->cd->addr; |
1711 | chan->cfg.dst_addr = chan->cd->addr; | |
121c8476 RKAL |
1712 | } |
1713 | ||
e8689e63 LW |
1714 | /* |
1715 | * Initialise the DMAC memcpy/slave channels. | |
1716 | * Make a local wrapper to hold required data | |
1717 | */ | |
1718 | static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, | |
3e27ee84 | 1719 | struct dma_device *dmadev, unsigned int channels, bool slave) |
e8689e63 LW |
1720 | { |
1721 | struct pl08x_dma_chan *chan; | |
1722 | int i; | |
1723 | ||
1724 | INIT_LIST_HEAD(&dmadev->channels); | |
94ae8522 | 1725 | |
e8689e63 LW |
1726 | /* |
1727 | * Register as many many memcpy as we have physical channels, | |
1728 | * we won't always be able to use all but the code will have | |
1729 | * to cope with that situation. | |
1730 | */ | |
1731 | for (i = 0; i < channels; i++) { | |
b201c111 | 1732 | chan = kzalloc(sizeof(*chan), GFP_KERNEL); |
e8689e63 LW |
1733 | if (!chan) { |
1734 | dev_err(&pl08x->adev->dev, | |
1735 | "%s no memory for channel\n", __func__); | |
1736 | return -ENOMEM; | |
1737 | } | |
1738 | ||
1739 | chan->host = pl08x; | |
1740 | chan->state = PL08X_CHAN_IDLE; | |
ad0de2ac | 1741 | chan->signal = -1; |
e8689e63 LW |
1742 | |
1743 | if (slave) { | |
e8689e63 | 1744 | chan->cd = &pl08x->pd->slave_channels[i]; |
121c8476 | 1745 | pl08x_dma_slave_init(chan); |
e8689e63 LW |
1746 | } else { |
1747 | chan->cd = &pl08x->pd->memcpy_channel; | |
1748 | chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i); | |
1749 | if (!chan->name) { | |
1750 | kfree(chan); | |
1751 | return -ENOMEM; | |
1752 | } | |
1753 | } | |
175a5e61 | 1754 | dev_dbg(&pl08x->adev->dev, |
e8689e63 LW |
1755 | "initialize virtual channel \"%s\"\n", |
1756 | chan->name); | |
1757 | ||
18536134 | 1758 | chan->vc.desc_free = pl08x_desc_free; |
083be28a | 1759 | vchan_init(&chan->vc, dmadev); |
e8689e63 LW |
1760 | } |
1761 | dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n", | |
1762 | i, slave ? "slave" : "memcpy"); | |
1763 | return i; | |
1764 | } | |
1765 | ||
1766 | static void pl08x_free_virtual_channels(struct dma_device *dmadev) | |
1767 | { | |
1768 | struct pl08x_dma_chan *chan = NULL; | |
1769 | struct pl08x_dma_chan *next; | |
1770 | ||
1771 | list_for_each_entry_safe(chan, | |
01d8dc64 RK |
1772 | next, &dmadev->channels, vc.chan.device_node) { |
1773 | list_del(&chan->vc.chan.device_node); | |
e8689e63 LW |
1774 | kfree(chan); |
1775 | } | |
1776 | } | |
1777 | ||
1778 | #ifdef CONFIG_DEBUG_FS | |
1779 | static const char *pl08x_state_str(enum pl08x_dma_chan_state state) | |
1780 | { | |
1781 | switch (state) { | |
1782 | case PL08X_CHAN_IDLE: | |
1783 | return "idle"; | |
1784 | case PL08X_CHAN_RUNNING: | |
1785 | return "running"; | |
1786 | case PL08X_CHAN_PAUSED: | |
1787 | return "paused"; | |
1788 | case PL08X_CHAN_WAITING: | |
1789 | return "waiting"; | |
1790 | default: | |
1791 | break; | |
1792 | } | |
1793 | return "UNKNOWN STATE"; | |
1794 | } | |
1795 | ||
1796 | static int pl08x_debugfs_show(struct seq_file *s, void *data) | |
1797 | { | |
1798 | struct pl08x_driver_data *pl08x = s->private; | |
1799 | struct pl08x_dma_chan *chan; | |
1800 | struct pl08x_phy_chan *ch; | |
1801 | unsigned long flags; | |
1802 | int i; | |
1803 | ||
1804 | seq_printf(s, "PL08x physical channels:\n"); | |
1805 | seq_printf(s, "CHANNEL:\tUSER:\n"); | |
1806 | seq_printf(s, "--------\t-----\n"); | |
1807 | for (i = 0; i < pl08x->vd->channels; i++) { | |
1808 | struct pl08x_dma_chan *virt_chan; | |
1809 | ||
1810 | ch = &pl08x->phy_chans[i]; | |
1811 | ||
1812 | spin_lock_irqsave(&ch->lock, flags); | |
1813 | virt_chan = ch->serving; | |
1814 | ||
affa115e LW |
1815 | seq_printf(s, "%d\t\t%s%s\n", |
1816 | ch->id, | |
1817 | virt_chan ? virt_chan->name : "(none)", | |
1818 | ch->locked ? " LOCKED" : ""); | |
e8689e63 LW |
1819 | |
1820 | spin_unlock_irqrestore(&ch->lock, flags); | |
1821 | } | |
1822 | ||
1823 | seq_printf(s, "\nPL08x virtual memcpy channels:\n"); | |
1824 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
1825 | seq_printf(s, "--------\t------\n"); | |
01d8dc64 | 1826 | list_for_each_entry(chan, &pl08x->memcpy.channels, vc.chan.device_node) { |
3e2a037c | 1827 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
1828 | pl08x_state_str(chan->state)); |
1829 | } | |
1830 | ||
1831 | seq_printf(s, "\nPL08x virtual slave channels:\n"); | |
1832 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
1833 | seq_printf(s, "--------\t------\n"); | |
01d8dc64 | 1834 | list_for_each_entry(chan, &pl08x->slave.channels, vc.chan.device_node) { |
3e2a037c | 1835 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
1836 | pl08x_state_str(chan->state)); |
1837 | } | |
1838 | ||
1839 | return 0; | |
1840 | } | |
1841 | ||
1842 | static int pl08x_debugfs_open(struct inode *inode, struct file *file) | |
1843 | { | |
1844 | return single_open(file, pl08x_debugfs_show, inode->i_private); | |
1845 | } | |
1846 | ||
1847 | static const struct file_operations pl08x_debugfs_operations = { | |
1848 | .open = pl08x_debugfs_open, | |
1849 | .read = seq_read, | |
1850 | .llseek = seq_lseek, | |
1851 | .release = single_release, | |
1852 | }; | |
1853 | ||
1854 | static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
1855 | { | |
1856 | /* Expose a simple debugfs interface to view all clocks */ | |
3e27ee84 VK |
1857 | (void) debugfs_create_file(dev_name(&pl08x->adev->dev), |
1858 | S_IFREG | S_IRUGO, NULL, pl08x, | |
1859 | &pl08x_debugfs_operations); | |
e8689e63 LW |
1860 | } |
1861 | ||
1862 | #else | |
1863 | static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
1864 | { | |
1865 | } | |
1866 | #endif | |
1867 | ||
aa25afad | 1868 | static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) |
e8689e63 LW |
1869 | { |
1870 | struct pl08x_driver_data *pl08x; | |
f96ca9ec | 1871 | const struct vendor_data *vd = id->data; |
e8689e63 LW |
1872 | int ret = 0; |
1873 | int i; | |
1874 | ||
1875 | ret = amba_request_regions(adev, NULL); | |
1876 | if (ret) | |
1877 | return ret; | |
1878 | ||
1879 | /* Create the driver state holder */ | |
b201c111 | 1880 | pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL); |
e8689e63 LW |
1881 | if (!pl08x) { |
1882 | ret = -ENOMEM; | |
1883 | goto out_no_pl08x; | |
1884 | } | |
1885 | ||
1886 | /* Initialize memcpy engine */ | |
1887 | dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask); | |
1888 | pl08x->memcpy.dev = &adev->dev; | |
1889 | pl08x->memcpy.device_alloc_chan_resources = pl08x_alloc_chan_resources; | |
1890 | pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources; | |
1891 | pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy; | |
1892 | pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
1893 | pl08x->memcpy.device_tx_status = pl08x_dma_tx_status; | |
1894 | pl08x->memcpy.device_issue_pending = pl08x_issue_pending; | |
1895 | pl08x->memcpy.device_control = pl08x_control; | |
1896 | ||
1897 | /* Initialize slave engine */ | |
1898 | dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask); | |
1899 | pl08x->slave.dev = &adev->dev; | |
1900 | pl08x->slave.device_alloc_chan_resources = pl08x_alloc_chan_resources; | |
1901 | pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources; | |
1902 | pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
1903 | pl08x->slave.device_tx_status = pl08x_dma_tx_status; | |
1904 | pl08x->slave.device_issue_pending = pl08x_issue_pending; | |
1905 | pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg; | |
1906 | pl08x->slave.device_control = pl08x_control; | |
1907 | ||
1908 | /* Get the platform data */ | |
1909 | pl08x->pd = dev_get_platdata(&adev->dev); | |
1910 | if (!pl08x->pd) { | |
1911 | dev_err(&adev->dev, "no platform data supplied\n"); | |
1912 | goto out_no_platdata; | |
1913 | } | |
1914 | ||
1915 | /* Assign useful pointers to the driver state */ | |
1916 | pl08x->adev = adev; | |
1917 | pl08x->vd = vd; | |
1918 | ||
30749cb4 RKAL |
1919 | /* By default, AHB1 only. If dualmaster, from platform */ |
1920 | pl08x->lli_buses = PL08X_AHB1; | |
1921 | pl08x->mem_buses = PL08X_AHB1; | |
1922 | if (pl08x->vd->dualmaster) { | |
1923 | pl08x->lli_buses = pl08x->pd->lli_buses; | |
1924 | pl08x->mem_buses = pl08x->pd->mem_buses; | |
1925 | } | |
1926 | ||
e8689e63 LW |
1927 | /* A DMA memory pool for LLIs, align on 1-byte boundary */ |
1928 | pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev, | |
1929 | PL08X_LLI_TSFR_SIZE, PL08X_ALIGN, 0); | |
1930 | if (!pl08x->pool) { | |
1931 | ret = -ENOMEM; | |
1932 | goto out_no_lli_pool; | |
1933 | } | |
1934 | ||
e8689e63 LW |
1935 | pl08x->base = ioremap(adev->res.start, resource_size(&adev->res)); |
1936 | if (!pl08x->base) { | |
1937 | ret = -ENOMEM; | |
1938 | goto out_no_ioremap; | |
1939 | } | |
1940 | ||
1941 | /* Turn on the PL08x */ | |
1942 | pl08x_ensure_on(pl08x); | |
1943 | ||
94ae8522 | 1944 | /* Attach the interrupt handler */ |
e8689e63 LW |
1945 | writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR); |
1946 | writel(0x000000FF, pl08x->base + PL080_TC_CLEAR); | |
1947 | ||
1948 | ret = request_irq(adev->irq[0], pl08x_irq, IRQF_DISABLED, | |
b05cd8f4 | 1949 | DRIVER_NAME, pl08x); |
e8689e63 LW |
1950 | if (ret) { |
1951 | dev_err(&adev->dev, "%s failed to request interrupt %d\n", | |
1952 | __func__, adev->irq[0]); | |
1953 | goto out_no_irq; | |
1954 | } | |
1955 | ||
1956 | /* Initialize physical channels */ | |
affa115e | 1957 | pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)), |
e8689e63 LW |
1958 | GFP_KERNEL); |
1959 | if (!pl08x->phy_chans) { | |
1960 | dev_err(&adev->dev, "%s failed to allocate " | |
1961 | "physical channel holders\n", | |
1962 | __func__); | |
1963 | goto out_no_phychans; | |
1964 | } | |
1965 | ||
1966 | for (i = 0; i < vd->channels; i++) { | |
1967 | struct pl08x_phy_chan *ch = &pl08x->phy_chans[i]; | |
1968 | ||
1969 | ch->id = i; | |
1970 | ch->base = pl08x->base + PL080_Cx_BASE(i); | |
1971 | spin_lock_init(&ch->lock); | |
affa115e LW |
1972 | |
1973 | /* | |
1974 | * Nomadik variants can have channels that are locked | |
1975 | * down for the secure world only. Lock up these channels | |
1976 | * by perpetually serving a dummy virtual channel. | |
1977 | */ | |
1978 | if (vd->nomadik) { | |
1979 | u32 val; | |
1980 | ||
1981 | val = readl(ch->base + PL080_CH_CONFIG); | |
1982 | if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) { | |
1983 | dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i); | |
1984 | ch->locked = true; | |
1985 | } | |
1986 | } | |
1987 | ||
175a5e61 VK |
1988 | dev_dbg(&adev->dev, "physical channel %d is %s\n", |
1989 | i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE"); | |
e8689e63 LW |
1990 | } |
1991 | ||
1992 | /* Register as many memcpy channels as there are physical channels */ | |
1993 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy, | |
1994 | pl08x->vd->channels, false); | |
1995 | if (ret <= 0) { | |
1996 | dev_warn(&pl08x->adev->dev, | |
1997 | "%s failed to enumerate memcpy channels - %d\n", | |
1998 | __func__, ret); | |
1999 | goto out_no_memcpy; | |
2000 | } | |
2001 | pl08x->memcpy.chancnt = ret; | |
2002 | ||
2003 | /* Register slave channels */ | |
2004 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave, | |
3e27ee84 | 2005 | pl08x->pd->num_slave_channels, true); |
e8689e63 LW |
2006 | if (ret <= 0) { |
2007 | dev_warn(&pl08x->adev->dev, | |
2008 | "%s failed to enumerate slave channels - %d\n", | |
2009 | __func__, ret); | |
2010 | goto out_no_slave; | |
2011 | } | |
2012 | pl08x->slave.chancnt = ret; | |
2013 | ||
2014 | ret = dma_async_device_register(&pl08x->memcpy); | |
2015 | if (ret) { | |
2016 | dev_warn(&pl08x->adev->dev, | |
2017 | "%s failed to register memcpy as an async device - %d\n", | |
2018 | __func__, ret); | |
2019 | goto out_no_memcpy_reg; | |
2020 | } | |
2021 | ||
2022 | ret = dma_async_device_register(&pl08x->slave); | |
2023 | if (ret) { | |
2024 | dev_warn(&pl08x->adev->dev, | |
2025 | "%s failed to register slave as an async device - %d\n", | |
2026 | __func__, ret); | |
2027 | goto out_no_slave_reg; | |
2028 | } | |
2029 | ||
2030 | amba_set_drvdata(adev, pl08x); | |
2031 | init_pl08x_debugfs(pl08x); | |
b05cd8f4 RKAL |
2032 | dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n", |
2033 | amba_part(adev), amba_rev(adev), | |
2034 | (unsigned long long)adev->res.start, adev->irq[0]); | |
b7b6018b | 2035 | |
e8689e63 LW |
2036 | return 0; |
2037 | ||
2038 | out_no_slave_reg: | |
2039 | dma_async_device_unregister(&pl08x->memcpy); | |
2040 | out_no_memcpy_reg: | |
2041 | pl08x_free_virtual_channels(&pl08x->slave); | |
2042 | out_no_slave: | |
2043 | pl08x_free_virtual_channels(&pl08x->memcpy); | |
2044 | out_no_memcpy: | |
2045 | kfree(pl08x->phy_chans); | |
2046 | out_no_phychans: | |
2047 | free_irq(adev->irq[0], pl08x); | |
2048 | out_no_irq: | |
2049 | iounmap(pl08x->base); | |
2050 | out_no_ioremap: | |
2051 | dma_pool_destroy(pl08x->pool); | |
2052 | out_no_lli_pool: | |
2053 | out_no_platdata: | |
2054 | kfree(pl08x); | |
2055 | out_no_pl08x: | |
2056 | amba_release_regions(adev); | |
2057 | return ret; | |
2058 | } | |
2059 | ||
2060 | /* PL080 has 8 channels and the PL080 have just 2 */ | |
2061 | static struct vendor_data vendor_pl080 = { | |
e8689e63 LW |
2062 | .channels = 8, |
2063 | .dualmaster = true, | |
2064 | }; | |
2065 | ||
affa115e LW |
2066 | static struct vendor_data vendor_nomadik = { |
2067 | .channels = 8, | |
2068 | .dualmaster = true, | |
2069 | .nomadik = true, | |
2070 | }; | |
2071 | ||
e8689e63 | 2072 | static struct vendor_data vendor_pl081 = { |
e8689e63 LW |
2073 | .channels = 2, |
2074 | .dualmaster = false, | |
2075 | }; | |
2076 | ||
2077 | static struct amba_id pl08x_ids[] = { | |
2078 | /* PL080 */ | |
2079 | { | |
2080 | .id = 0x00041080, | |
2081 | .mask = 0x000fffff, | |
2082 | .data = &vendor_pl080, | |
2083 | }, | |
2084 | /* PL081 */ | |
2085 | { | |
2086 | .id = 0x00041081, | |
2087 | .mask = 0x000fffff, | |
2088 | .data = &vendor_pl081, | |
2089 | }, | |
2090 | /* Nomadik 8815 PL080 variant */ | |
2091 | { | |
affa115e | 2092 | .id = 0x00280080, |
e8689e63 | 2093 | .mask = 0x00ffffff, |
affa115e | 2094 | .data = &vendor_nomadik, |
e8689e63 LW |
2095 | }, |
2096 | { 0, 0 }, | |
2097 | }; | |
2098 | ||
037566df DM |
2099 | MODULE_DEVICE_TABLE(amba, pl08x_ids); |
2100 | ||
e8689e63 LW |
2101 | static struct amba_driver pl08x_amba_driver = { |
2102 | .drv.name = DRIVER_NAME, | |
2103 | .id_table = pl08x_ids, | |
2104 | .probe = pl08x_probe, | |
2105 | }; | |
2106 | ||
2107 | static int __init pl08x_init(void) | |
2108 | { | |
2109 | int retval; | |
2110 | retval = amba_driver_register(&pl08x_amba_driver); | |
2111 | if (retval) | |
2112 | printk(KERN_WARNING DRIVER_NAME | |
e8b5e11d | 2113 | "failed to register as an AMBA device (%d)\n", |
e8689e63 LW |
2114 | retval); |
2115 | return retval; | |
2116 | } | |
2117 | subsys_initcall(pl08x_init); |