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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 RKAL |
88 | #include "dmaengine.h" |
89 | ||
e8689e63 LW |
90 | #define DRIVER_NAME "pl08xdmac" |
91 | ||
7703eac9 | 92 | static struct amba_driver pl08x_amba_driver; |
b23f204c | 93 | struct pl08x_driver_data; |
7703eac9 | 94 | |
e8689e63 | 95 | /** |
94ae8522 | 96 | * struct vendor_data - vendor-specific config parameters for PL08x derivatives |
e8689e63 | 97 | * @channels: the number of channels available in this variant |
94ae8522 | 98 | * @dualmaster: whether this version supports dual AHB masters or not. |
affa115e LW |
99 | * @nomadik: whether the channels have Nomadik security extension bits |
100 | * that need to be checked for permission before use and some registers are | |
101 | * missing | |
e8689e63 LW |
102 | */ |
103 | struct vendor_data { | |
e8689e63 LW |
104 | u8 channels; |
105 | bool dualmaster; | |
affa115e | 106 | bool nomadik; |
e8689e63 LW |
107 | }; |
108 | ||
109 | /* | |
110 | * PL08X private data structures | |
e8b5e11d | 111 | * An LLI struct - see PL08x TRM. Note that next uses bit[0] as a bus bit, |
e25761d7 RKAL |
112 | * start & end do not - their bus bit info is in cctl. Also note that these |
113 | * are fixed 32-bit quantities. | |
e8689e63 | 114 | */ |
7cb72ad9 | 115 | struct pl08x_lli { |
e25761d7 RKAL |
116 | u32 src; |
117 | u32 dst; | |
bfddfb45 | 118 | u32 lli; |
e8689e63 LW |
119 | u32 cctl; |
120 | }; | |
121 | ||
b23f204c RK |
122 | /** |
123 | * struct pl08x_bus_data - information of source or destination | |
124 | * busses for a transfer | |
125 | * @addr: current address | |
126 | * @maxwidth: the maximum width of a transfer on this bus | |
127 | * @buswidth: the width of this bus in bytes: 1, 2 or 4 | |
128 | */ | |
129 | struct pl08x_bus_data { | |
130 | dma_addr_t addr; | |
131 | u8 maxwidth; | |
132 | u8 buswidth; | |
133 | }; | |
134 | ||
135 | /** | |
136 | * struct pl08x_phy_chan - holder for the physical channels | |
137 | * @id: physical index to this channel | |
138 | * @lock: a lock to use when altering an instance of this struct | |
139 | * @signal: the physical signal (aka channel) serving this physical channel | |
140 | * right now | |
141 | * @serving: the virtual channel currently being served by this physical | |
142 | * channel | |
143 | */ | |
144 | struct pl08x_phy_chan { | |
145 | unsigned int id; | |
146 | void __iomem *base; | |
147 | spinlock_t lock; | |
148 | int signal; | |
149 | struct pl08x_dma_chan *serving; | |
150 | }; | |
151 | ||
152 | /** | |
153 | * struct pl08x_sg - structure containing data per sg | |
154 | * @src_addr: src address of sg | |
155 | * @dst_addr: dst address of sg | |
156 | * @len: transfer len in bytes | |
157 | * @node: node for txd's dsg_list | |
158 | */ | |
159 | struct pl08x_sg { | |
160 | dma_addr_t src_addr; | |
161 | dma_addr_t dst_addr; | |
162 | size_t len; | |
163 | struct list_head node; | |
164 | }; | |
165 | ||
166 | /** | |
167 | * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor | |
168 | * @tx: async tx descriptor | |
169 | * @node: node for txd list for channels | |
170 | * @dsg_list: list of children sg's | |
171 | * @direction: direction of transfer | |
172 | * @llis_bus: DMA memory address (physical) start for the LLIs | |
173 | * @llis_va: virtual memory address start for the LLIs | |
174 | * @cctl: control reg values for current txd | |
175 | * @ccfg: config reg values for current txd | |
176 | */ | |
177 | struct pl08x_txd { | |
178 | struct dma_async_tx_descriptor tx; | |
179 | struct list_head node; | |
180 | struct list_head dsg_list; | |
181 | enum dma_transfer_direction direction; | |
182 | dma_addr_t llis_bus; | |
183 | struct pl08x_lli *llis_va; | |
184 | /* Default cctl value for LLIs */ | |
185 | u32 cctl; | |
186 | /* | |
187 | * Settings to be put into the physical channel when we | |
188 | * trigger this txd. Other registers are in llis_va[0]. | |
189 | */ | |
190 | u32 ccfg; | |
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 | |
213 | * @chan: wrappped abstract channel | |
214 | * @phychan: the physical channel utilized by this channel, if there is one | |
215 | * @phychan_hold: if non-zero, hold on to the physical channel even if we | |
216 | * have no pending entries | |
217 | * @tasklet: tasklet scheduled by the IRQ to handle actual work etc | |
218 | * @name: name of channel | |
219 | * @cd: channel platform data | |
220 | * @runtime_addr: address for RX/TX according to the runtime config | |
221 | * @runtime_direction: current direction of this channel according to | |
222 | * runtime config | |
223 | * @pend_list: queued transactions pending on this channel | |
224 | * @at: active transaction on this channel | |
225 | * @lock: a lock for this channel data | |
226 | * @host: a pointer to the host (internal use) | |
227 | * @state: whether the channel is idle, paused, running etc | |
228 | * @slave: whether this channel is a device (slave) or for memcpy | |
229 | * @device_fc: Flow Controller Settings for ccfg register. Only valid for slave | |
230 | * channels. Fill with 'true' if peripheral should be flow controller. Direction | |
231 | * will be selected at Runtime. | |
232 | * @waiting: a TX descriptor on this channel which is waiting for a physical | |
233 | * channel to become available | |
234 | */ | |
235 | struct pl08x_dma_chan { | |
236 | struct dma_chan chan; | |
237 | struct pl08x_phy_chan *phychan; | |
238 | int phychan_hold; | |
239 | struct tasklet_struct tasklet; | |
550ec36f | 240 | const char *name; |
b23f204c | 241 | const struct pl08x_channel_data *cd; |
ed91c13d | 242 | struct dma_slave_config cfg; |
b23f204c RK |
243 | u32 src_cctl; |
244 | u32 dst_cctl; | |
245 | enum dma_transfer_direction runtime_direction; | |
246 | struct list_head pend_list; | |
247 | struct pl08x_txd *at; | |
248 | spinlock_t lock; | |
249 | struct pl08x_driver_data *host; | |
250 | enum pl08x_dma_chan_state state; | |
251 | bool slave; | |
252 | bool device_fc; | |
253 | struct pl08x_txd *waiting; | |
254 | }; | |
255 | ||
e8689e63 LW |
256 | /** |
257 | * struct pl08x_driver_data - the local state holder for the PL08x | |
258 | * @slave: slave engine for this instance | |
259 | * @memcpy: memcpy engine for this instance | |
260 | * @base: virtual memory base (remapped) for the PL08x | |
261 | * @adev: the corresponding AMBA (PrimeCell) bus entry | |
262 | * @vd: vendor data for this PL08x variant | |
263 | * @pd: platform data passed in from the platform/machine | |
264 | * @phy_chans: array of data for the physical channels | |
265 | * @pool: a pool for the LLI descriptors | |
266 | * @pool_ctr: counter of LLIs in the pool | |
3e27ee84 VK |
267 | * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI |
268 | * fetches | |
30749cb4 | 269 | * @mem_buses: set to indicate memory transfers on AHB2. |
e8689e63 LW |
270 | * @lock: a spinlock for this struct |
271 | */ | |
272 | struct pl08x_driver_data { | |
273 | struct dma_device slave; | |
274 | struct dma_device memcpy; | |
275 | void __iomem *base; | |
276 | struct amba_device *adev; | |
f96ca9ec | 277 | const struct vendor_data *vd; |
e8689e63 LW |
278 | struct pl08x_platform_data *pd; |
279 | struct pl08x_phy_chan *phy_chans; | |
280 | struct dma_pool *pool; | |
281 | int pool_ctr; | |
30749cb4 RKAL |
282 | u8 lli_buses; |
283 | u8 mem_buses; | |
e8689e63 LW |
284 | }; |
285 | ||
286 | /* | |
287 | * PL08X specific defines | |
288 | */ | |
289 | ||
e8689e63 LW |
290 | /* Size (bytes) of each LLI buffer allocated for one transfer */ |
291 | # define PL08X_LLI_TSFR_SIZE 0x2000 | |
292 | ||
e8b5e11d | 293 | /* Maximum times we call dma_pool_alloc on this pool without freeing */ |
7cb72ad9 | 294 | #define MAX_NUM_TSFR_LLIS (PL08X_LLI_TSFR_SIZE/sizeof(struct pl08x_lli)) |
e8689e63 LW |
295 | #define PL08X_ALIGN 8 |
296 | ||
297 | static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan) | |
298 | { | |
299 | return container_of(chan, struct pl08x_dma_chan, chan); | |
300 | } | |
301 | ||
501e67e8 RKAL |
302 | static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx) |
303 | { | |
304 | return container_of(tx, struct pl08x_txd, tx); | |
305 | } | |
306 | ||
e8689e63 LW |
307 | /* |
308 | * Physical channel handling | |
309 | */ | |
310 | ||
311 | /* Whether a certain channel is busy or not */ | |
312 | static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch) | |
313 | { | |
314 | unsigned int val; | |
315 | ||
316 | val = readl(ch->base + PL080_CH_CONFIG); | |
317 | return val & PL080_CONFIG_ACTIVE; | |
318 | } | |
319 | ||
320 | /* | |
321 | * Set the initial DMA register values i.e. those for the first LLI | |
e8b5e11d | 322 | * The next LLI pointer and the configuration interrupt bit have |
c885bee4 RKAL |
323 | * been set when the LLIs were constructed. Poke them into the hardware |
324 | * and start the transfer. | |
e8689e63 | 325 | */ |
c885bee4 RKAL |
326 | static void pl08x_start_txd(struct pl08x_dma_chan *plchan, |
327 | struct pl08x_txd *txd) | |
e8689e63 | 328 | { |
c885bee4 | 329 | struct pl08x_driver_data *pl08x = plchan->host; |
e8689e63 | 330 | struct pl08x_phy_chan *phychan = plchan->phychan; |
19524d77 | 331 | struct pl08x_lli *lli = &txd->llis_va[0]; |
09b3c323 | 332 | u32 val; |
c885bee4 RKAL |
333 | |
334 | plchan->at = txd; | |
e8689e63 | 335 | |
c885bee4 RKAL |
336 | /* Wait for channel inactive */ |
337 | while (pl08x_phy_channel_busy(phychan)) | |
338 | cpu_relax(); | |
e8689e63 | 339 | |
c885bee4 RKAL |
340 | dev_vdbg(&pl08x->adev->dev, |
341 | "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " | |
19524d77 RKAL |
342 | "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n", |
343 | phychan->id, lli->src, lli->dst, lli->lli, lli->cctl, | |
09b3c323 | 344 | txd->ccfg); |
19524d77 RKAL |
345 | |
346 | writel(lli->src, phychan->base + PL080_CH_SRC_ADDR); | |
347 | writel(lli->dst, phychan->base + PL080_CH_DST_ADDR); | |
348 | writel(lli->lli, phychan->base + PL080_CH_LLI); | |
349 | writel(lli->cctl, phychan->base + PL080_CH_CONTROL); | |
09b3c323 | 350 | writel(txd->ccfg, phychan->base + PL080_CH_CONFIG); |
c885bee4 RKAL |
351 | |
352 | /* Enable the DMA channel */ | |
353 | /* Do not access config register until channel shows as disabled */ | |
354 | while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id)) | |
19386b32 | 355 | cpu_relax(); |
e8689e63 | 356 | |
c885bee4 RKAL |
357 | /* Do not access config register until channel shows as inactive */ |
358 | val = readl(phychan->base + PL080_CH_CONFIG); | |
e8689e63 | 359 | while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE)) |
c885bee4 | 360 | val = readl(phychan->base + PL080_CH_CONFIG); |
e8689e63 | 361 | |
c885bee4 | 362 | writel(val | PL080_CONFIG_ENABLE, phychan->base + PL080_CH_CONFIG); |
e8689e63 LW |
363 | } |
364 | ||
365 | /* | |
81796616 | 366 | * Pause the channel by setting the HALT bit. |
e8689e63 | 367 | * |
81796616 RKAL |
368 | * For M->P transfers, pause the DMAC first and then stop the peripheral - |
369 | * the FIFO can only drain if the peripheral is still requesting data. | |
370 | * (note: this can still timeout if the DMAC FIFO never drains of data.) | |
e8689e63 | 371 | * |
81796616 RKAL |
372 | * For P->M transfers, disable the peripheral first to stop it filling |
373 | * the DMAC FIFO, and then pause the DMAC. | |
e8689e63 LW |
374 | */ |
375 | static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch) | |
376 | { | |
377 | u32 val; | |
81796616 | 378 | int timeout; |
e8689e63 LW |
379 | |
380 | /* Set the HALT bit and wait for the FIFO to drain */ | |
381 | val = readl(ch->base + PL080_CH_CONFIG); | |
382 | val |= PL080_CONFIG_HALT; | |
383 | writel(val, ch->base + PL080_CH_CONFIG); | |
384 | ||
385 | /* Wait for channel inactive */ | |
81796616 RKAL |
386 | for (timeout = 1000; timeout; timeout--) { |
387 | if (!pl08x_phy_channel_busy(ch)) | |
388 | break; | |
389 | udelay(1); | |
390 | } | |
391 | if (pl08x_phy_channel_busy(ch)) | |
392 | pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id); | |
e8689e63 LW |
393 | } |
394 | ||
395 | static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch) | |
396 | { | |
397 | u32 val; | |
398 | ||
399 | /* Clear the HALT bit */ | |
400 | val = readl(ch->base + PL080_CH_CONFIG); | |
401 | val &= ~PL080_CONFIG_HALT; | |
402 | writel(val, ch->base + PL080_CH_CONFIG); | |
403 | } | |
404 | ||
fb526210 RKAL |
405 | /* |
406 | * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and | |
407 | * clears any pending interrupt status. This should not be used for | |
408 | * an on-going transfer, but as a method of shutting down a channel | |
409 | * (eg, when it's no longer used) or terminating a transfer. | |
410 | */ | |
411 | static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x, | |
412 | struct pl08x_phy_chan *ch) | |
e8689e63 | 413 | { |
fb526210 | 414 | u32 val = readl(ch->base + PL080_CH_CONFIG); |
e8689e63 | 415 | |
fb526210 RKAL |
416 | val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK | |
417 | PL080_CONFIG_TC_IRQ_MASK); | |
e8689e63 | 418 | |
e8689e63 | 419 | writel(val, ch->base + PL080_CH_CONFIG); |
fb526210 RKAL |
420 | |
421 | writel(1 << ch->id, pl08x->base + PL080_ERR_CLEAR); | |
422 | writel(1 << ch->id, pl08x->base + PL080_TC_CLEAR); | |
e8689e63 LW |
423 | } |
424 | ||
425 | static inline u32 get_bytes_in_cctl(u32 cctl) | |
426 | { | |
427 | /* The source width defines the number of bytes */ | |
428 | u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK; | |
429 | ||
430 | switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { | |
431 | case PL080_WIDTH_8BIT: | |
432 | break; | |
433 | case PL080_WIDTH_16BIT: | |
434 | bytes *= 2; | |
435 | break; | |
436 | case PL080_WIDTH_32BIT: | |
437 | bytes *= 4; | |
438 | break; | |
439 | } | |
440 | return bytes; | |
441 | } | |
442 | ||
443 | /* The channel should be paused when calling this */ | |
444 | static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) | |
445 | { | |
446 | struct pl08x_phy_chan *ch; | |
e8689e63 LW |
447 | struct pl08x_txd *txd; |
448 | unsigned long flags; | |
cace6585 | 449 | size_t bytes = 0; |
e8689e63 LW |
450 | |
451 | spin_lock_irqsave(&plchan->lock, flags); | |
e8689e63 LW |
452 | ch = plchan->phychan; |
453 | txd = plchan->at; | |
454 | ||
455 | /* | |
db9f136a RKAL |
456 | * Follow the LLIs to get the number of remaining |
457 | * bytes in the currently active transaction. | |
e8689e63 LW |
458 | */ |
459 | if (ch && txd) { | |
4c0df6a3 | 460 | u32 clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2; |
e8689e63 | 461 | |
db9f136a | 462 | /* First get the remaining bytes in the active transfer */ |
e8689e63 LW |
463 | bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL)); |
464 | ||
465 | if (clli) { | |
db9f136a RKAL |
466 | struct pl08x_lli *llis_va = txd->llis_va; |
467 | dma_addr_t llis_bus = txd->llis_bus; | |
468 | int index; | |
469 | ||
470 | BUG_ON(clli < llis_bus || clli >= llis_bus + | |
471 | sizeof(struct pl08x_lli) * MAX_NUM_TSFR_LLIS); | |
e8689e63 | 472 | |
db9f136a RKAL |
473 | /* |
474 | * Locate the next LLI - as this is an array, | |
475 | * it's simple maths to find. | |
476 | */ | |
477 | index = (clli - llis_bus) / sizeof(struct pl08x_lli); | |
478 | ||
479 | for (; index < MAX_NUM_TSFR_LLIS; index++) { | |
480 | bytes += get_bytes_in_cctl(llis_va[index].cctl); | |
e8689e63 | 481 | |
e8689e63 | 482 | /* |
e8b5e11d | 483 | * A LLI pointer of 0 terminates the LLI list |
e8689e63 | 484 | */ |
db9f136a RKAL |
485 | if (!llis_va[index].lli) |
486 | break; | |
e8689e63 LW |
487 | } |
488 | } | |
489 | } | |
490 | ||
491 | /* Sum up all queued transactions */ | |
15c17232 | 492 | if (!list_empty(&plchan->pend_list)) { |
db9f136a | 493 | struct pl08x_txd *txdi; |
15c17232 | 494 | list_for_each_entry(txdi, &plchan->pend_list, node) { |
b7f69d9d VK |
495 | struct pl08x_sg *dsg; |
496 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
497 | bytes += dsg->len; | |
e8689e63 | 498 | } |
e8689e63 LW |
499 | } |
500 | ||
501 | spin_unlock_irqrestore(&plchan->lock, flags); | |
502 | ||
503 | return bytes; | |
504 | } | |
505 | ||
506 | /* | |
507 | * Allocate a physical channel for a virtual channel | |
94ae8522 RKAL |
508 | * |
509 | * Try to locate a physical channel to be used for this transfer. If all | |
510 | * are taken return NULL and the requester will have to cope by using | |
511 | * some fallback PIO mode or retrying later. | |
e8689e63 LW |
512 | */ |
513 | static struct pl08x_phy_chan * | |
514 | pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, | |
515 | struct pl08x_dma_chan *virt_chan) | |
516 | { | |
517 | struct pl08x_phy_chan *ch = NULL; | |
518 | unsigned long flags; | |
519 | int i; | |
520 | ||
e8689e63 LW |
521 | for (i = 0; i < pl08x->vd->channels; i++) { |
522 | ch = &pl08x->phy_chans[i]; | |
523 | ||
524 | spin_lock_irqsave(&ch->lock, flags); | |
525 | ||
affa115e | 526 | if (!ch->locked && !ch->serving) { |
e8689e63 LW |
527 | ch->serving = virt_chan; |
528 | ch->signal = -1; | |
529 | spin_unlock_irqrestore(&ch->lock, flags); | |
530 | break; | |
531 | } | |
532 | ||
533 | spin_unlock_irqrestore(&ch->lock, flags); | |
534 | } | |
535 | ||
536 | if (i == pl08x->vd->channels) { | |
537 | /* No physical channel available, cope with it */ | |
538 | return NULL; | |
539 | } | |
540 | ||
541 | return ch; | |
542 | } | |
543 | ||
544 | static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x, | |
545 | struct pl08x_phy_chan *ch) | |
546 | { | |
547 | unsigned long flags; | |
548 | ||
fb526210 RKAL |
549 | spin_lock_irqsave(&ch->lock, flags); |
550 | ||
e8689e63 | 551 | /* Stop the channel and clear its interrupts */ |
fb526210 | 552 | pl08x_terminate_phy_chan(pl08x, ch); |
e8689e63 LW |
553 | |
554 | /* Mark it as free */ | |
e8689e63 LW |
555 | ch->serving = NULL; |
556 | spin_unlock_irqrestore(&ch->lock, flags); | |
557 | } | |
558 | ||
559 | /* | |
560 | * LLI handling | |
561 | */ | |
562 | ||
563 | static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded) | |
564 | { | |
565 | switch (coded) { | |
566 | case PL080_WIDTH_8BIT: | |
567 | return 1; | |
568 | case PL080_WIDTH_16BIT: | |
569 | return 2; | |
570 | case PL080_WIDTH_32BIT: | |
571 | return 4; | |
572 | default: | |
573 | break; | |
574 | } | |
575 | BUG(); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth, | |
cace6585 | 580 | size_t tsize) |
e8689e63 LW |
581 | { |
582 | u32 retbits = cctl; | |
583 | ||
e8b5e11d | 584 | /* Remove all src, dst and transfer size bits */ |
e8689e63 LW |
585 | retbits &= ~PL080_CONTROL_DWIDTH_MASK; |
586 | retbits &= ~PL080_CONTROL_SWIDTH_MASK; | |
587 | retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK; | |
588 | ||
589 | /* Then set the bits according to the parameters */ | |
590 | switch (srcwidth) { | |
591 | case 1: | |
592 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
593 | break; | |
594 | case 2: | |
595 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
596 | break; | |
597 | case 4: | |
598 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
599 | break; | |
600 | default: | |
601 | BUG(); | |
602 | break; | |
603 | } | |
604 | ||
605 | switch (dstwidth) { | |
606 | case 1: | |
607 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
608 | break; | |
609 | case 2: | |
610 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
611 | break; | |
612 | case 4: | |
613 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
614 | break; | |
615 | default: | |
616 | BUG(); | |
617 | break; | |
618 | } | |
619 | ||
620 | retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT; | |
621 | return retbits; | |
622 | } | |
623 | ||
542361f8 RKAL |
624 | struct pl08x_lli_build_data { |
625 | struct pl08x_txd *txd; | |
542361f8 RKAL |
626 | struct pl08x_bus_data srcbus; |
627 | struct pl08x_bus_data dstbus; | |
628 | size_t remainder; | |
25c94f7f | 629 | u32 lli_bus; |
542361f8 RKAL |
630 | }; |
631 | ||
e8689e63 | 632 | /* |
0532e6fc VK |
633 | * Autoselect a master bus to use for the transfer. Slave will be the chosen as |
634 | * victim in case src & dest are not similarly aligned. i.e. If after aligning | |
635 | * masters address with width requirements of transfer (by sending few byte by | |
636 | * byte data), slave is still not aligned, then its width will be reduced to | |
637 | * BYTE. | |
638 | * - prefers the destination bus if both available | |
036f05fd | 639 | * - prefers bus with fixed address (i.e. peripheral) |
e8689e63 | 640 | */ |
542361f8 RKAL |
641 | static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd, |
642 | struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl) | |
e8689e63 LW |
643 | { |
644 | if (!(cctl & PL080_CONTROL_DST_INCR)) { | |
542361f8 RKAL |
645 | *mbus = &bd->dstbus; |
646 | *sbus = &bd->srcbus; | |
036f05fd VK |
647 | } else if (!(cctl & PL080_CONTROL_SRC_INCR)) { |
648 | *mbus = &bd->srcbus; | |
649 | *sbus = &bd->dstbus; | |
e8689e63 | 650 | } else { |
036f05fd | 651 | if (bd->dstbus.buswidth >= bd->srcbus.buswidth) { |
542361f8 RKAL |
652 | *mbus = &bd->dstbus; |
653 | *sbus = &bd->srcbus; | |
036f05fd | 654 | } else { |
542361f8 RKAL |
655 | *mbus = &bd->srcbus; |
656 | *sbus = &bd->dstbus; | |
e8689e63 LW |
657 | } |
658 | } | |
659 | } | |
660 | ||
661 | /* | |
94ae8522 | 662 | * Fills in one LLI for a certain transfer descriptor and advance the counter |
e8689e63 | 663 | */ |
542361f8 RKAL |
664 | static void pl08x_fill_lli_for_desc(struct pl08x_lli_build_data *bd, |
665 | int num_llis, int len, u32 cctl) | |
e8689e63 | 666 | { |
542361f8 RKAL |
667 | struct pl08x_lli *llis_va = bd->txd->llis_va; |
668 | dma_addr_t llis_bus = bd->txd->llis_bus; | |
e8689e63 LW |
669 | |
670 | BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS); | |
671 | ||
30749cb4 | 672 | llis_va[num_llis].cctl = cctl; |
542361f8 RKAL |
673 | llis_va[num_llis].src = bd->srcbus.addr; |
674 | llis_va[num_llis].dst = bd->dstbus.addr; | |
3e27ee84 VK |
675 | llis_va[num_llis].lli = llis_bus + (num_llis + 1) * |
676 | sizeof(struct pl08x_lli); | |
25c94f7f | 677 | llis_va[num_llis].lli |= bd->lli_bus; |
e8689e63 LW |
678 | |
679 | if (cctl & PL080_CONTROL_SRC_INCR) | |
542361f8 | 680 | bd->srcbus.addr += len; |
e8689e63 | 681 | if (cctl & PL080_CONTROL_DST_INCR) |
542361f8 | 682 | bd->dstbus.addr += len; |
e8689e63 | 683 | |
542361f8 | 684 | BUG_ON(bd->remainder < len); |
cace6585 | 685 | |
542361f8 | 686 | bd->remainder -= len; |
e8689e63 LW |
687 | } |
688 | ||
03af500f VK |
689 | static inline void prep_byte_width_lli(struct pl08x_lli_build_data *bd, |
690 | u32 *cctl, u32 len, int num_llis, size_t *total_bytes) | |
e8689e63 | 691 | { |
03af500f VK |
692 | *cctl = pl08x_cctl_bits(*cctl, 1, 1, len); |
693 | pl08x_fill_lli_for_desc(bd, num_llis, len, *cctl); | |
694 | (*total_bytes) += len; | |
e8689e63 LW |
695 | } |
696 | ||
697 | /* | |
698 | * This fills in the table of LLIs for the transfer descriptor | |
699 | * Note that we assume we never have to change the burst sizes | |
700 | * Return 0 for error | |
701 | */ | |
702 | static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, | |
703 | struct pl08x_txd *txd) | |
704 | { | |
e8689e63 | 705 | struct pl08x_bus_data *mbus, *sbus; |
542361f8 | 706 | struct pl08x_lli_build_data bd; |
e8689e63 | 707 | int num_llis = 0; |
03af500f | 708 | u32 cctl, early_bytes = 0; |
b7f69d9d | 709 | size_t max_bytes_per_lli, total_bytes; |
7cb72ad9 | 710 | struct pl08x_lli *llis_va; |
b7f69d9d | 711 | struct pl08x_sg *dsg; |
e8689e63 | 712 | |
3e27ee84 | 713 | txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus); |
e8689e63 LW |
714 | if (!txd->llis_va) { |
715 | dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | pl08x->pool_ctr++; | |
720 | ||
542361f8 | 721 | bd.txd = txd; |
25c94f7f | 722 | bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0; |
b7f69d9d | 723 | cctl = txd->cctl; |
542361f8 | 724 | |
e8689e63 | 725 | /* Find maximum width of the source bus */ |
542361f8 | 726 | bd.srcbus.maxwidth = |
e8689e63 LW |
727 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >> |
728 | PL080_CONTROL_SWIDTH_SHIFT); | |
729 | ||
730 | /* Find maximum width of the destination bus */ | |
542361f8 | 731 | bd.dstbus.maxwidth = |
e8689e63 LW |
732 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >> |
733 | PL080_CONTROL_DWIDTH_SHIFT); | |
734 | ||
b7f69d9d VK |
735 | list_for_each_entry(dsg, &txd->dsg_list, node) { |
736 | total_bytes = 0; | |
737 | cctl = txd->cctl; | |
e8689e63 | 738 | |
b7f69d9d VK |
739 | bd.srcbus.addr = dsg->src_addr; |
740 | bd.dstbus.addr = dsg->dst_addr; | |
741 | bd.remainder = dsg->len; | |
742 | bd.srcbus.buswidth = bd.srcbus.maxwidth; | |
743 | bd.dstbus.buswidth = bd.dstbus.maxwidth; | |
e8689e63 | 744 | |
b7f69d9d | 745 | pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl); |
e8689e63 | 746 | |
b7f69d9d VK |
747 | dev_vdbg(&pl08x->adev->dev, "src=0x%08x%s/%u dst=0x%08x%s/%u len=%zu\n", |
748 | bd.srcbus.addr, cctl & PL080_CONTROL_SRC_INCR ? "+" : "", | |
749 | bd.srcbus.buswidth, | |
750 | bd.dstbus.addr, cctl & PL080_CONTROL_DST_INCR ? "+" : "", | |
751 | bd.dstbus.buswidth, | |
752 | bd.remainder); | |
753 | dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n", | |
754 | mbus == &bd.srcbus ? "src" : "dst", | |
755 | sbus == &bd.srcbus ? "src" : "dst"); | |
fc74eb79 | 756 | |
b7f69d9d VK |
757 | /* |
758 | * Zero length is only allowed if all these requirements are | |
759 | * met: | |
760 | * - flow controller is peripheral. | |
761 | * - src.addr is aligned to src.width | |
762 | * - dst.addr is aligned to dst.width | |
763 | * | |
764 | * sg_len == 1 should be true, as there can be two cases here: | |
765 | * | |
766 | * - Memory addresses are contiguous and are not scattered. | |
767 | * Here, Only one sg will be passed by user driver, with | |
768 | * memory address and zero length. We pass this to controller | |
769 | * and after the transfer it will receive the last burst | |
770 | * request from peripheral and so transfer finishes. | |
771 | * | |
772 | * - Memory addresses are scattered and are not contiguous. | |
773 | * Here, Obviously as DMA controller doesn't know when a lli's | |
774 | * transfer gets over, it can't load next lli. So in this | |
775 | * case, there has to be an assumption that only one lli is | |
776 | * supported. Thus, we can't have scattered addresses. | |
777 | */ | |
778 | if (!bd.remainder) { | |
779 | u32 fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >> | |
780 | PL080_CONFIG_FLOW_CONTROL_SHIFT; | |
781 | if (!((fc >= PL080_FLOW_SRC2DST_DST) && | |
0a235657 | 782 | (fc <= PL080_FLOW_SRC2DST_SRC))) { |
b7f69d9d VK |
783 | dev_err(&pl08x->adev->dev, "%s sg len can't be zero", |
784 | __func__); | |
785 | return 0; | |
786 | } | |
0a235657 | 787 | |
b7f69d9d | 788 | if ((bd.srcbus.addr % bd.srcbus.buswidth) || |
880db3ff | 789 | (bd.dstbus.addr % bd.dstbus.buswidth)) { |
b7f69d9d VK |
790 | dev_err(&pl08x->adev->dev, |
791 | "%s src & dst address must be aligned to src" | |
792 | " & dst width if peripheral is flow controller", | |
793 | __func__); | |
794 | return 0; | |
795 | } | |
03af500f | 796 | |
b7f69d9d VK |
797 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, |
798 | bd.dstbus.buswidth, 0); | |
799 | pl08x_fill_lli_for_desc(&bd, num_llis++, 0, cctl); | |
800 | break; | |
801 | } | |
e8689e63 LW |
802 | |
803 | /* | |
b7f69d9d VK |
804 | * Send byte by byte for following cases |
805 | * - Less than a bus width available | |
806 | * - until master bus is aligned | |
e8689e63 | 807 | */ |
b7f69d9d VK |
808 | if (bd.remainder < mbus->buswidth) |
809 | early_bytes = bd.remainder; | |
810 | else if ((mbus->addr) % (mbus->buswidth)) { | |
811 | early_bytes = mbus->buswidth - (mbus->addr) % | |
812 | (mbus->buswidth); | |
813 | if ((bd.remainder - early_bytes) < mbus->buswidth) | |
814 | early_bytes = bd.remainder; | |
815 | } | |
e8689e63 | 816 | |
b7f69d9d VK |
817 | if (early_bytes) { |
818 | dev_vdbg(&pl08x->adev->dev, | |
819 | "%s byte width LLIs (remain 0x%08x)\n", | |
820 | __func__, bd.remainder); | |
821 | prep_byte_width_lli(&bd, &cctl, early_bytes, num_llis++, | |
822 | &total_bytes); | |
e8689e63 LW |
823 | } |
824 | ||
b7f69d9d VK |
825 | if (bd.remainder) { |
826 | /* | |
827 | * Master now aligned | |
828 | * - if slave is not then we must set its width down | |
829 | */ | |
830 | if (sbus->addr % sbus->buswidth) { | |
831 | dev_dbg(&pl08x->adev->dev, | |
832 | "%s set down bus width to one byte\n", | |
833 | __func__); | |
fa6a940b | 834 | |
b7f69d9d VK |
835 | sbus->buswidth = 1; |
836 | } | |
e8689e63 LW |
837 | |
838 | /* | |
b7f69d9d VK |
839 | * Bytes transferred = tsize * src width, not |
840 | * MIN(buswidths) | |
e8689e63 | 841 | */ |
b7f69d9d VK |
842 | max_bytes_per_lli = bd.srcbus.buswidth * |
843 | PL080_CONTROL_TRANSFER_SIZE_MASK; | |
844 | dev_vdbg(&pl08x->adev->dev, | |
845 | "%s max bytes per lli = %zu\n", | |
846 | __func__, max_bytes_per_lli); | |
e8689e63 LW |
847 | |
848 | /* | |
b7f69d9d VK |
849 | * Make largest possible LLIs until less than one bus |
850 | * width left | |
e8689e63 | 851 | */ |
b7f69d9d VK |
852 | while (bd.remainder > (mbus->buswidth - 1)) { |
853 | size_t lli_len, tsize, width; | |
e8689e63 | 854 | |
b7f69d9d VK |
855 | /* |
856 | * If enough left try to send max possible, | |
857 | * otherwise try to send the remainder | |
858 | */ | |
859 | lli_len = min(bd.remainder, max_bytes_per_lli); | |
16a2e7d3 | 860 | |
b7f69d9d VK |
861 | /* |
862 | * Check against maximum bus alignment: | |
863 | * Calculate actual transfer size in relation to | |
864 | * bus width an get a maximum remainder of the | |
865 | * highest bus width - 1 | |
866 | */ | |
867 | width = max(mbus->buswidth, sbus->buswidth); | |
868 | lli_len = (lli_len / width) * width; | |
869 | tsize = lli_len / bd.srcbus.buswidth; | |
870 | ||
871 | dev_vdbg(&pl08x->adev->dev, | |
872 | "%s fill lli with single lli chunk of " | |
873 | "size 0x%08zx (remainder 0x%08zx)\n", | |
874 | __func__, lli_len, bd.remainder); | |
875 | ||
876 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, | |
16a2e7d3 | 877 | bd.dstbus.buswidth, tsize); |
b7f69d9d VK |
878 | pl08x_fill_lli_for_desc(&bd, num_llis++, |
879 | lli_len, cctl); | |
880 | total_bytes += lli_len; | |
881 | } | |
e8689e63 | 882 | |
b7f69d9d VK |
883 | /* |
884 | * Send any odd bytes | |
885 | */ | |
886 | if (bd.remainder) { | |
887 | dev_vdbg(&pl08x->adev->dev, | |
888 | "%s align with boundary, send odd bytes (remain %zu)\n", | |
889 | __func__, bd.remainder); | |
890 | prep_byte_width_lli(&bd, &cctl, bd.remainder, | |
891 | num_llis++, &total_bytes); | |
892 | } | |
e8689e63 | 893 | } |
16a2e7d3 | 894 | |
b7f69d9d VK |
895 | if (total_bytes != dsg->len) { |
896 | dev_err(&pl08x->adev->dev, | |
897 | "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n", | |
898 | __func__, total_bytes, dsg->len); | |
899 | return 0; | |
900 | } | |
e8689e63 | 901 | |
b7f69d9d VK |
902 | if (num_llis >= MAX_NUM_TSFR_LLIS) { |
903 | dev_err(&pl08x->adev->dev, | |
904 | "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n", | |
905 | __func__, (u32) MAX_NUM_TSFR_LLIS); | |
906 | return 0; | |
907 | } | |
e8689e63 | 908 | } |
b58b6b5b RKAL |
909 | |
910 | llis_va = txd->llis_va; | |
94ae8522 | 911 | /* The final LLI terminates the LLI. */ |
bfddfb45 | 912 | llis_va[num_llis - 1].lli = 0; |
94ae8522 | 913 | /* The final LLI element shall also fire an interrupt. */ |
b58b6b5b | 914 | llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN; |
e8689e63 | 915 | |
e8689e63 LW |
916 | #ifdef VERBOSE_DEBUG |
917 | { | |
918 | int i; | |
919 | ||
fc74eb79 RKAL |
920 | dev_vdbg(&pl08x->adev->dev, |
921 | "%-3s %-9s %-10s %-10s %-10s %s\n", | |
922 | "lli", "", "csrc", "cdst", "clli", "cctl"); | |
e8689e63 LW |
923 | for (i = 0; i < num_llis; i++) { |
924 | dev_vdbg(&pl08x->adev->dev, | |
fc74eb79 RKAL |
925 | "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n", |
926 | i, &llis_va[i], llis_va[i].src, | |
927 | llis_va[i].dst, llis_va[i].lli, llis_va[i].cctl | |
e8689e63 LW |
928 | ); |
929 | } | |
930 | } | |
931 | #endif | |
932 | ||
933 | return num_llis; | |
934 | } | |
935 | ||
936 | /* You should call this with the struct pl08x lock held */ | |
937 | static void pl08x_free_txd(struct pl08x_driver_data *pl08x, | |
938 | struct pl08x_txd *txd) | |
939 | { | |
b7f69d9d VK |
940 | struct pl08x_sg *dsg, *_dsg; |
941 | ||
e8689e63 | 942 | /* Free the LLI */ |
c1205646 VK |
943 | if (txd->llis_va) |
944 | dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus); | |
e8689e63 LW |
945 | |
946 | pl08x->pool_ctr--; | |
947 | ||
b7f69d9d VK |
948 | list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) { |
949 | list_del(&dsg->node); | |
950 | kfree(dsg); | |
951 | } | |
952 | ||
e8689e63 LW |
953 | kfree(txd); |
954 | } | |
955 | ||
956 | static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, | |
957 | struct pl08x_dma_chan *plchan) | |
958 | { | |
959 | struct pl08x_txd *txdi = NULL; | |
960 | struct pl08x_txd *next; | |
961 | ||
15c17232 | 962 | if (!list_empty(&plchan->pend_list)) { |
e8689e63 | 963 | list_for_each_entry_safe(txdi, |
15c17232 | 964 | next, &plchan->pend_list, node) { |
e8689e63 LW |
965 | list_del(&txdi->node); |
966 | pl08x_free_txd(pl08x, txdi); | |
967 | } | |
e8689e63 LW |
968 | } |
969 | } | |
970 | ||
971 | /* | |
972 | * The DMA ENGINE API | |
973 | */ | |
974 | static int pl08x_alloc_chan_resources(struct dma_chan *chan) | |
975 | { | |
976 | return 0; | |
977 | } | |
978 | ||
979 | static void pl08x_free_chan_resources(struct dma_chan *chan) | |
980 | { | |
981 | } | |
982 | ||
983 | /* | |
984 | * This should be called with the channel plchan->lock held | |
985 | */ | |
986 | static int prep_phy_channel(struct pl08x_dma_chan *plchan, | |
987 | struct pl08x_txd *txd) | |
988 | { | |
989 | struct pl08x_driver_data *pl08x = plchan->host; | |
990 | struct pl08x_phy_chan *ch; | |
991 | int ret; | |
992 | ||
993 | /* Check if we already have a channel */ | |
8f0d30f9 VK |
994 | if (plchan->phychan) { |
995 | ch = plchan->phychan; | |
996 | goto got_channel; | |
997 | } | |
e8689e63 LW |
998 | |
999 | ch = pl08x_get_phy_channel(pl08x, plchan); | |
1000 | if (!ch) { | |
1001 | /* No physical channel available, cope with it */ | |
1002 | dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name); | |
1003 | return -EBUSY; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * OK we have a physical channel: for memcpy() this is all we | |
1008 | * need, but for slaves the physical signals may be muxed! | |
1009 | * Can the platform allow us to use this channel? | |
1010 | */ | |
16ca8105 | 1011 | if (plchan->slave && pl08x->pd->get_signal) { |
aeea1808 | 1012 | ret = pl08x->pd->get_signal(plchan->cd); |
e8689e63 LW |
1013 | if (ret < 0) { |
1014 | dev_dbg(&pl08x->adev->dev, | |
1015 | "unable to use physical channel %d for transfer on %s due to platform restrictions\n", | |
1016 | ch->id, plchan->name); | |
1017 | /* Release physical channel & return */ | |
1018 | pl08x_put_phy_channel(pl08x, ch); | |
1019 | return -EBUSY; | |
1020 | } | |
1021 | ch->signal = ret; | |
1022 | } | |
1023 | ||
8f0d30f9 | 1024 | plchan->phychan = ch; |
e8689e63 LW |
1025 | dev_dbg(&pl08x->adev->dev, "allocated physical channel %d and signal %d for xfer on %s\n", |
1026 | ch->id, | |
1027 | ch->signal, | |
1028 | plchan->name); | |
1029 | ||
8f0d30f9 VK |
1030 | got_channel: |
1031 | /* Assign the flow control signal to this channel */ | |
1032 | if (txd->direction == DMA_MEM_TO_DEV) | |
1033 | txd->ccfg |= ch->signal << PL080_CONFIG_DST_SEL_SHIFT; | |
1034 | else if (txd->direction == DMA_DEV_TO_MEM) | |
1035 | txd->ccfg |= ch->signal << PL080_CONFIG_SRC_SEL_SHIFT; | |
1036 | ||
8087aacd | 1037 | plchan->phychan_hold++; |
e8689e63 LW |
1038 | |
1039 | return 0; | |
1040 | } | |
1041 | ||
8c8cc2b1 RKAL |
1042 | static void release_phy_channel(struct pl08x_dma_chan *plchan) |
1043 | { | |
1044 | struct pl08x_driver_data *pl08x = plchan->host; | |
1045 | ||
1046 | if ((plchan->phychan->signal >= 0) && pl08x->pd->put_signal) { | |
aeea1808 | 1047 | pl08x->pd->put_signal(plchan->cd, plchan->phychan->signal); |
8c8cc2b1 RKAL |
1048 | plchan->phychan->signal = -1; |
1049 | } | |
1050 | pl08x_put_phy_channel(pl08x, plchan->phychan); | |
1051 | plchan->phychan = NULL; | |
1052 | } | |
1053 | ||
e8689e63 LW |
1054 | static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx) |
1055 | { | |
1056 | struct pl08x_dma_chan *plchan = to_pl08x_chan(tx->chan); | |
501e67e8 | 1057 | struct pl08x_txd *txd = to_pl08x_txd(tx); |
c370e594 | 1058 | unsigned long flags; |
884485e1 | 1059 | dma_cookie_t cookie; |
c370e594 RKAL |
1060 | |
1061 | spin_lock_irqsave(&plchan->lock, flags); | |
884485e1 | 1062 | cookie = dma_cookie_assign(tx); |
501e67e8 RKAL |
1063 | |
1064 | /* Put this onto the pending list */ | |
1065 | list_add_tail(&txd->node, &plchan->pend_list); | |
1066 | ||
1067 | /* | |
1068 | * If there was no physical channel available for this memcpy, | |
1069 | * stack the request up and indicate that the channel is waiting | |
1070 | * for a free physical channel. | |
1071 | */ | |
1072 | if (!plchan->slave && !plchan->phychan) { | |
1073 | /* Do this memcpy whenever there is a channel ready */ | |
1074 | plchan->state = PL08X_CHAN_WAITING; | |
1075 | plchan->waiting = txd; | |
8087aacd RKAL |
1076 | } else { |
1077 | plchan->phychan_hold--; | |
501e67e8 RKAL |
1078 | } |
1079 | ||
c370e594 | 1080 | spin_unlock_irqrestore(&plchan->lock, flags); |
e8689e63 | 1081 | |
884485e1 | 1082 | return cookie; |
e8689e63 LW |
1083 | } |
1084 | ||
1085 | static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt( | |
1086 | struct dma_chan *chan, unsigned long flags) | |
1087 | { | |
1088 | struct dma_async_tx_descriptor *retval = NULL; | |
1089 | ||
1090 | return retval; | |
1091 | } | |
1092 | ||
1093 | /* | |
94ae8522 RKAL |
1094 | * Code accessing dma_async_is_complete() in a tight loop may give problems. |
1095 | * If slaves are relying on interrupts to signal completion this function | |
1096 | * must not be called with interrupts disabled. | |
e8689e63 | 1097 | */ |
3e27ee84 VK |
1098 | static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan, |
1099 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
e8689e63 LW |
1100 | { |
1101 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
e8689e63 | 1102 | enum dma_status ret; |
e8689e63 | 1103 | |
96a2af41 RKAL |
1104 | ret = dma_cookie_status(chan, cookie, txstate); |
1105 | if (ret == DMA_SUCCESS) | |
e8689e63 | 1106 | return ret; |
e8689e63 | 1107 | |
e8689e63 LW |
1108 | /* |
1109 | * This cookie not complete yet | |
96a2af41 | 1110 | * Get number of bytes left in the active transactions and queue |
e8689e63 | 1111 | */ |
96a2af41 | 1112 | dma_set_residue(txstate, pl08x_getbytes_chan(plchan)); |
e8689e63 LW |
1113 | |
1114 | if (plchan->state == PL08X_CHAN_PAUSED) | |
1115 | return DMA_PAUSED; | |
1116 | ||
1117 | /* Whether waiting or running, we're in progress */ | |
1118 | return DMA_IN_PROGRESS; | |
1119 | } | |
1120 | ||
1121 | /* PrimeCell DMA extension */ | |
1122 | struct burst_table { | |
760596c6 | 1123 | u32 burstwords; |
e8689e63 LW |
1124 | u32 reg; |
1125 | }; | |
1126 | ||
1127 | static const struct burst_table burst_sizes[] = { | |
1128 | { | |
1129 | .burstwords = 256, | |
760596c6 | 1130 | .reg = PL080_BSIZE_256, |
e8689e63 LW |
1131 | }, |
1132 | { | |
1133 | .burstwords = 128, | |
760596c6 | 1134 | .reg = PL080_BSIZE_128, |
e8689e63 LW |
1135 | }, |
1136 | { | |
1137 | .burstwords = 64, | |
760596c6 | 1138 | .reg = PL080_BSIZE_64, |
e8689e63 LW |
1139 | }, |
1140 | { | |
1141 | .burstwords = 32, | |
760596c6 | 1142 | .reg = PL080_BSIZE_32, |
e8689e63 LW |
1143 | }, |
1144 | { | |
1145 | .burstwords = 16, | |
760596c6 | 1146 | .reg = PL080_BSIZE_16, |
e8689e63 LW |
1147 | }, |
1148 | { | |
1149 | .burstwords = 8, | |
760596c6 | 1150 | .reg = PL080_BSIZE_8, |
e8689e63 LW |
1151 | }, |
1152 | { | |
1153 | .burstwords = 4, | |
760596c6 | 1154 | .reg = PL080_BSIZE_4, |
e8689e63 LW |
1155 | }, |
1156 | { | |
760596c6 RKAL |
1157 | .burstwords = 0, |
1158 | .reg = PL080_BSIZE_1, | |
e8689e63 LW |
1159 | }, |
1160 | }; | |
1161 | ||
121c8476 RKAL |
1162 | /* |
1163 | * Given the source and destination available bus masks, select which | |
1164 | * will be routed to each port. We try to have source and destination | |
1165 | * on separate ports, but always respect the allowable settings. | |
1166 | */ | |
1167 | static u32 pl08x_select_bus(u8 src, u8 dst) | |
1168 | { | |
1169 | u32 cctl = 0; | |
1170 | ||
1171 | if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1))) | |
1172 | cctl |= PL080_CONTROL_DST_AHB2; | |
1173 | if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2))) | |
1174 | cctl |= PL080_CONTROL_SRC_AHB2; | |
1175 | ||
1176 | return cctl; | |
1177 | } | |
1178 | ||
f14c426c RKAL |
1179 | static u32 pl08x_cctl(u32 cctl) |
1180 | { | |
1181 | cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 | | |
1182 | PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR | | |
1183 | PL080_CONTROL_PROT_MASK); | |
1184 | ||
1185 | /* Access the cell in privileged mode, non-bufferable, non-cacheable */ | |
1186 | return cctl | PL080_CONTROL_PROT_SYS; | |
1187 | } | |
1188 | ||
aa88cdaa RKAL |
1189 | static u32 pl08x_width(enum dma_slave_buswidth width) |
1190 | { | |
1191 | switch (width) { | |
1192 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
1193 | return PL080_WIDTH_8BIT; | |
1194 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
1195 | return PL080_WIDTH_16BIT; | |
1196 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
1197 | return PL080_WIDTH_32BIT; | |
f32807f1 VK |
1198 | default: |
1199 | return ~0; | |
aa88cdaa | 1200 | } |
aa88cdaa RKAL |
1201 | } |
1202 | ||
760596c6 RKAL |
1203 | static u32 pl08x_burst(u32 maxburst) |
1204 | { | |
1205 | int i; | |
1206 | ||
1207 | for (i = 0; i < ARRAY_SIZE(burst_sizes); i++) | |
1208 | if (burst_sizes[i].burstwords <= maxburst) | |
1209 | break; | |
1210 | ||
1211 | return burst_sizes[i].reg; | |
1212 | } | |
1213 | ||
f0fd9446 RKAL |
1214 | static int dma_set_runtime_config(struct dma_chan *chan, |
1215 | struct dma_slave_config *config) | |
e8689e63 LW |
1216 | { |
1217 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1218 | struct pl08x_driver_data *pl08x = plchan->host; | |
e8689e63 | 1219 | enum dma_slave_buswidth addr_width; |
760596c6 | 1220 | u32 width, burst, maxburst; |
e8689e63 | 1221 | u32 cctl = 0; |
b7f75865 RKAL |
1222 | |
1223 | if (!plchan->slave) | |
1224 | return -EINVAL; | |
e8689e63 LW |
1225 | |
1226 | /* Transfer direction */ | |
1227 | plchan->runtime_direction = config->direction; | |
db8196df | 1228 | if (config->direction == DMA_MEM_TO_DEV) { |
e8689e63 LW |
1229 | addr_width = config->dst_addr_width; |
1230 | maxburst = config->dst_maxburst; | |
db8196df | 1231 | } else if (config->direction == DMA_DEV_TO_MEM) { |
e8689e63 LW |
1232 | addr_width = config->src_addr_width; |
1233 | maxburst = config->src_maxburst; | |
1234 | } else { | |
1235 | dev_err(&pl08x->adev->dev, | |
1236 | "bad runtime_config: alien transfer direction\n"); | |
f0fd9446 | 1237 | return -EINVAL; |
e8689e63 LW |
1238 | } |
1239 | ||
aa88cdaa RKAL |
1240 | width = pl08x_width(addr_width); |
1241 | if (width == ~0) { | |
e8689e63 LW |
1242 | dev_err(&pl08x->adev->dev, |
1243 | "bad runtime_config: alien address width\n"); | |
f0fd9446 | 1244 | return -EINVAL; |
e8689e63 LW |
1245 | } |
1246 | ||
ed91c13d RK |
1247 | plchan->cfg = *config; |
1248 | ||
aa88cdaa RKAL |
1249 | cctl |= width << PL080_CONTROL_SWIDTH_SHIFT; |
1250 | cctl |= width << PL080_CONTROL_DWIDTH_SHIFT; | |
1251 | ||
e8689e63 | 1252 | /* |
4440aacf RKAL |
1253 | * If this channel will only request single transfers, set this |
1254 | * down to ONE element. Also select one element if no maxburst | |
1255 | * is specified. | |
e8689e63 | 1256 | */ |
760596c6 RKAL |
1257 | if (plchan->cd->single) |
1258 | maxburst = 1; | |
1259 | ||
1260 | burst = pl08x_burst(maxburst); | |
1261 | cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT; | |
1262 | cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT; | |
e8689e63 | 1263 | |
8c9f7aa3 VK |
1264 | plchan->device_fc = config->device_fc; |
1265 | ||
db8196df | 1266 | if (plchan->runtime_direction == DMA_DEV_TO_MEM) { |
121c8476 RKAL |
1267 | plchan->src_cctl = pl08x_cctl(cctl) | PL080_CONTROL_DST_INCR | |
1268 | pl08x_select_bus(plchan->cd->periph_buses, | |
1269 | pl08x->mem_buses); | |
b207b4d0 | 1270 | } else { |
121c8476 RKAL |
1271 | plchan->dst_cctl = pl08x_cctl(cctl) | PL080_CONTROL_SRC_INCR | |
1272 | pl08x_select_bus(pl08x->mem_buses, | |
1273 | plchan->cd->periph_buses); | |
b207b4d0 | 1274 | } |
f0fd9446 | 1275 | |
e8689e63 LW |
1276 | dev_dbg(&pl08x->adev->dev, |
1277 | "configured channel %s (%s) for %s, data width %d, " | |
4983a04f | 1278 | "maxburst %d words, LE, CCTL=0x%08x\n", |
e8689e63 | 1279 | dma_chan_name(chan), plchan->name, |
db8196df | 1280 | (config->direction == DMA_DEV_TO_MEM) ? "RX" : "TX", |
e8689e63 LW |
1281 | addr_width, |
1282 | maxburst, | |
4983a04f | 1283 | cctl); |
f0fd9446 RKAL |
1284 | |
1285 | return 0; | |
e8689e63 LW |
1286 | } |
1287 | ||
1288 | /* | |
1289 | * Slave transactions callback to the slave device to allow | |
1290 | * synchronization of slave DMA signals with the DMAC enable | |
1291 | */ | |
1292 | static void pl08x_issue_pending(struct dma_chan *chan) | |
1293 | { | |
1294 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
e8689e63 LW |
1295 | unsigned long flags; |
1296 | ||
1297 | spin_lock_irqsave(&plchan->lock, flags); | |
9c0bb43b RKAL |
1298 | /* Something is already active, or we're waiting for a channel... */ |
1299 | if (plchan->at || plchan->state == PL08X_CHAN_WAITING) { | |
1300 | spin_unlock_irqrestore(&plchan->lock, flags); | |
e8689e63 | 1301 | return; |
9c0bb43b | 1302 | } |
e8689e63 LW |
1303 | |
1304 | /* Take the first element in the queue and execute it */ | |
15c17232 | 1305 | if (!list_empty(&plchan->pend_list)) { |
e8689e63 LW |
1306 | struct pl08x_txd *next; |
1307 | ||
15c17232 | 1308 | next = list_first_entry(&plchan->pend_list, |
e8689e63 LW |
1309 | struct pl08x_txd, |
1310 | node); | |
1311 | list_del(&next->node); | |
e8689e63 LW |
1312 | plchan->state = PL08X_CHAN_RUNNING; |
1313 | ||
c885bee4 | 1314 | pl08x_start_txd(plchan, next); |
e8689e63 LW |
1315 | } |
1316 | ||
1317 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1318 | } | |
1319 | ||
1320 | static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan, | |
1321 | struct pl08x_txd *txd) | |
1322 | { | |
e8689e63 | 1323 | struct pl08x_driver_data *pl08x = plchan->host; |
c370e594 RKAL |
1324 | unsigned long flags; |
1325 | int num_llis, ret; | |
e8689e63 LW |
1326 | |
1327 | num_llis = pl08x_fill_llis_for_desc(pl08x, txd); | |
dafa7317 | 1328 | if (!num_llis) { |
57001a60 VK |
1329 | spin_lock_irqsave(&plchan->lock, flags); |
1330 | pl08x_free_txd(pl08x, txd); | |
1331 | spin_unlock_irqrestore(&plchan->lock, flags); | |
e8689e63 | 1332 | return -EINVAL; |
dafa7317 | 1333 | } |
e8689e63 | 1334 | |
c370e594 | 1335 | spin_lock_irqsave(&plchan->lock, flags); |
e8689e63 | 1336 | |
e8689e63 LW |
1337 | /* |
1338 | * See if we already have a physical channel allocated, | |
1339 | * else this is the time to try to get one. | |
1340 | */ | |
1341 | ret = prep_phy_channel(plchan, txd); | |
1342 | if (ret) { | |
1343 | /* | |
501e67e8 RKAL |
1344 | * No physical channel was available. |
1345 | * | |
1346 | * memcpy transfers can be sorted out at submission time. | |
1347 | * | |
1348 | * Slave transfers may have been denied due to platform | |
1349 | * channel muxing restrictions. Since there is no guarantee | |
1350 | * that this will ever be resolved, and the signal must be | |
1351 | * acquired AFTER acquiring the physical channel, we will let | |
1352 | * them be NACK:ed with -EBUSY here. The drivers can retry | |
1353 | * the prep() call if they are eager on doing this using DMA. | |
e8689e63 LW |
1354 | */ |
1355 | if (plchan->slave) { | |
1356 | pl08x_free_txd_list(pl08x, plchan); | |
501e67e8 | 1357 | pl08x_free_txd(pl08x, txd); |
c370e594 | 1358 | spin_unlock_irqrestore(&plchan->lock, flags); |
e8689e63 LW |
1359 | return -EBUSY; |
1360 | } | |
e8689e63 LW |
1361 | } else |
1362 | /* | |
94ae8522 RKAL |
1363 | * Else we're all set, paused and ready to roll, status |
1364 | * will switch to PL08X_CHAN_RUNNING when we call | |
1365 | * issue_pending(). If there is something running on the | |
1366 | * channel already we don't change its state. | |
e8689e63 LW |
1367 | */ |
1368 | if (plchan->state == PL08X_CHAN_IDLE) | |
1369 | plchan->state = PL08X_CHAN_PAUSED; | |
1370 | ||
c370e594 | 1371 | spin_unlock_irqrestore(&plchan->lock, flags); |
e8689e63 LW |
1372 | |
1373 | return 0; | |
1374 | } | |
1375 | ||
c0428794 RKAL |
1376 | static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan, |
1377 | unsigned long flags) | |
ac3cd20d | 1378 | { |
b201c111 | 1379 | struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT); |
ac3cd20d RKAL |
1380 | |
1381 | if (txd) { | |
1382 | dma_async_tx_descriptor_init(&txd->tx, &plchan->chan); | |
c0428794 | 1383 | txd->tx.flags = flags; |
ac3cd20d RKAL |
1384 | txd->tx.tx_submit = pl08x_tx_submit; |
1385 | INIT_LIST_HEAD(&txd->node); | |
b7f69d9d | 1386 | INIT_LIST_HEAD(&txd->dsg_list); |
4983a04f RKAL |
1387 | |
1388 | /* Always enable error and terminal interrupts */ | |
1389 | txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK | | |
1390 | PL080_CONFIG_TC_IRQ_MASK; | |
ac3cd20d RKAL |
1391 | } |
1392 | return txd; | |
1393 | } | |
1394 | ||
e8689e63 LW |
1395 | /* |
1396 | * Initialize a descriptor to be used by memcpy submit | |
1397 | */ | |
1398 | static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( | |
1399 | struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
1400 | size_t len, unsigned long flags) | |
1401 | { | |
1402 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1403 | struct pl08x_driver_data *pl08x = plchan->host; | |
1404 | struct pl08x_txd *txd; | |
b7f69d9d | 1405 | struct pl08x_sg *dsg; |
e8689e63 LW |
1406 | int ret; |
1407 | ||
c0428794 | 1408 | txd = pl08x_get_txd(plchan, flags); |
e8689e63 LW |
1409 | if (!txd) { |
1410 | dev_err(&pl08x->adev->dev, | |
1411 | "%s no memory for descriptor\n", __func__); | |
1412 | return NULL; | |
1413 | } | |
1414 | ||
b7f69d9d VK |
1415 | dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); |
1416 | if (!dsg) { | |
1417 | pl08x_free_txd(pl08x, txd); | |
1418 | dev_err(&pl08x->adev->dev, "%s no memory for pl080 sg\n", | |
1419 | __func__); | |
1420 | return NULL; | |
1421 | } | |
1422 | list_add_tail(&dsg->node, &txd->dsg_list); | |
1423 | ||
92d2fd61 | 1424 | txd->direction = DMA_MEM_TO_MEM; |
b7f69d9d VK |
1425 | dsg->src_addr = src; |
1426 | dsg->dst_addr = dest; | |
1427 | dsg->len = len; | |
e8689e63 LW |
1428 | |
1429 | /* Set platform data for m2m */ | |
4983a04f | 1430 | txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT; |
c7da9a56 RKAL |
1431 | txd->cctl = pl08x->pd->memcpy_channel.cctl & |
1432 | ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2); | |
4983a04f | 1433 | |
e8689e63 | 1434 | /* Both to be incremented or the code will break */ |
70b5ed6b | 1435 | txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR; |
c7da9a56 | 1436 | |
c7da9a56 | 1437 | if (pl08x->vd->dualmaster) |
121c8476 RKAL |
1438 | txd->cctl |= pl08x_select_bus(pl08x->mem_buses, |
1439 | pl08x->mem_buses); | |
e8689e63 | 1440 | |
e8689e63 LW |
1441 | ret = pl08x_prep_channel_resources(plchan, txd); |
1442 | if (ret) | |
1443 | return NULL; | |
e8689e63 LW |
1444 | |
1445 | return &txd->tx; | |
1446 | } | |
1447 | ||
3e2a037c | 1448 | static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( |
e8689e63 | 1449 | struct dma_chan *chan, struct scatterlist *sgl, |
db8196df | 1450 | unsigned int sg_len, enum dma_transfer_direction direction, |
185ecb5f | 1451 | unsigned long flags, void *context) |
e8689e63 LW |
1452 | { |
1453 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1454 | struct pl08x_driver_data *pl08x = plchan->host; | |
1455 | struct pl08x_txd *txd; | |
b7f69d9d VK |
1456 | struct pl08x_sg *dsg; |
1457 | struct scatterlist *sg; | |
1458 | dma_addr_t slave_addr; | |
0a235657 | 1459 | int ret, tmp; |
e8689e63 | 1460 | |
e8689e63 | 1461 | dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n", |
fdaf9c4b | 1462 | __func__, sg_dma_len(sgl), plchan->name); |
e8689e63 | 1463 | |
c0428794 | 1464 | txd = pl08x_get_txd(plchan, flags); |
e8689e63 LW |
1465 | if (!txd) { |
1466 | dev_err(&pl08x->adev->dev, "%s no txd\n", __func__); | |
1467 | return NULL; | |
1468 | } | |
1469 | ||
e8689e63 LW |
1470 | if (direction != plchan->runtime_direction) |
1471 | dev_err(&pl08x->adev->dev, "%s DMA setup does not match " | |
1472 | "the direction configured for the PrimeCell\n", | |
1473 | __func__); | |
1474 | ||
1475 | /* | |
1476 | * Set up addresses, the PrimeCell configured address | |
1477 | * will take precedence since this may configure the | |
1478 | * channel target address dynamically at runtime. | |
1479 | */ | |
1480 | txd->direction = direction; | |
c7da9a56 | 1481 | |
db8196df | 1482 | if (direction == DMA_MEM_TO_DEV) { |
121c8476 | 1483 | txd->cctl = plchan->dst_cctl; |
ed91c13d | 1484 | slave_addr = plchan->cfg.dst_addr; |
db8196df | 1485 | } else if (direction == DMA_DEV_TO_MEM) { |
121c8476 | 1486 | txd->cctl = plchan->src_cctl; |
ed91c13d | 1487 | slave_addr = plchan->cfg.src_addr; |
e8689e63 | 1488 | } else { |
b7f69d9d | 1489 | pl08x_free_txd(pl08x, txd); |
e8689e63 LW |
1490 | dev_err(&pl08x->adev->dev, |
1491 | "%s direction unsupported\n", __func__); | |
1492 | return NULL; | |
1493 | } | |
e8689e63 | 1494 | |
8c9f7aa3 | 1495 | if (plchan->device_fc) |
db8196df | 1496 | tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER_PER : |
0a235657 VK |
1497 | PL080_FLOW_PER2MEM_PER; |
1498 | else | |
db8196df | 1499 | tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER : |
0a235657 VK |
1500 | PL080_FLOW_PER2MEM; |
1501 | ||
1502 | txd->ccfg |= tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT; | |
1503 | ||
b7f69d9d VK |
1504 | for_each_sg(sgl, sg, sg_len, tmp) { |
1505 | dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); | |
1506 | if (!dsg) { | |
1507 | pl08x_free_txd(pl08x, txd); | |
1508 | dev_err(&pl08x->adev->dev, "%s no mem for pl080 sg\n", | |
1509 | __func__); | |
1510 | return NULL; | |
1511 | } | |
1512 | list_add_tail(&dsg->node, &txd->dsg_list); | |
1513 | ||
1514 | dsg->len = sg_dma_len(sg); | |
db8196df | 1515 | if (direction == DMA_MEM_TO_DEV) { |
cbb796cc | 1516 | dsg->src_addr = sg_dma_address(sg); |
b7f69d9d VK |
1517 | dsg->dst_addr = slave_addr; |
1518 | } else { | |
1519 | dsg->src_addr = slave_addr; | |
cbb796cc | 1520 | dsg->dst_addr = sg_dma_address(sg); |
b7f69d9d VK |
1521 | } |
1522 | } | |
1523 | ||
e8689e63 LW |
1524 | ret = pl08x_prep_channel_resources(plchan, txd); |
1525 | if (ret) | |
1526 | return NULL; | |
e8689e63 LW |
1527 | |
1528 | return &txd->tx; | |
1529 | } | |
1530 | ||
1531 | static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
1532 | unsigned long arg) | |
1533 | { | |
1534 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1535 | struct pl08x_driver_data *pl08x = plchan->host; | |
1536 | unsigned long flags; | |
1537 | int ret = 0; | |
1538 | ||
1539 | /* Controls applicable to inactive channels */ | |
1540 | if (cmd == DMA_SLAVE_CONFIG) { | |
f0fd9446 RKAL |
1541 | return dma_set_runtime_config(chan, |
1542 | (struct dma_slave_config *)arg); | |
e8689e63 LW |
1543 | } |
1544 | ||
1545 | /* | |
1546 | * Anything succeeds on channels with no physical allocation and | |
1547 | * no queued transfers. | |
1548 | */ | |
1549 | spin_lock_irqsave(&plchan->lock, flags); | |
1550 | if (!plchan->phychan && !plchan->at) { | |
1551 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | switch (cmd) { | |
1556 | case DMA_TERMINATE_ALL: | |
1557 | plchan->state = PL08X_CHAN_IDLE; | |
1558 | ||
1559 | if (plchan->phychan) { | |
fb526210 | 1560 | pl08x_terminate_phy_chan(pl08x, plchan->phychan); |
e8689e63 LW |
1561 | |
1562 | /* | |
1563 | * Mark physical channel as free and free any slave | |
1564 | * signal | |
1565 | */ | |
8c8cc2b1 | 1566 | release_phy_channel(plchan); |
88c08a3f | 1567 | plchan->phychan_hold = 0; |
e8689e63 | 1568 | } |
e8689e63 LW |
1569 | /* Dequeue jobs and free LLIs */ |
1570 | if (plchan->at) { | |
1571 | pl08x_free_txd(pl08x, plchan->at); | |
1572 | plchan->at = NULL; | |
1573 | } | |
1574 | /* Dequeue jobs not yet fired as well */ | |
1575 | pl08x_free_txd_list(pl08x, plchan); | |
1576 | break; | |
1577 | case DMA_PAUSE: | |
1578 | pl08x_pause_phy_chan(plchan->phychan); | |
1579 | plchan->state = PL08X_CHAN_PAUSED; | |
1580 | break; | |
1581 | case DMA_RESUME: | |
1582 | pl08x_resume_phy_chan(plchan->phychan); | |
1583 | plchan->state = PL08X_CHAN_RUNNING; | |
1584 | break; | |
1585 | default: | |
1586 | /* Unknown command */ | |
1587 | ret = -ENXIO; | |
1588 | break; | |
1589 | } | |
1590 | ||
1591 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1592 | ||
1593 | return ret; | |
1594 | } | |
1595 | ||
1596 | bool pl08x_filter_id(struct dma_chan *chan, void *chan_id) | |
1597 | { | |
7703eac9 | 1598 | struct pl08x_dma_chan *plchan; |
e8689e63 LW |
1599 | char *name = chan_id; |
1600 | ||
7703eac9 RKAL |
1601 | /* Reject channels for devices not bound to this driver */ |
1602 | if (chan->device->dev->driver != &pl08x_amba_driver.drv) | |
1603 | return false; | |
1604 | ||
1605 | plchan = to_pl08x_chan(chan); | |
1606 | ||
e8689e63 LW |
1607 | /* Check that the channel is not taken! */ |
1608 | if (!strcmp(plchan->name, name)) | |
1609 | return true; | |
1610 | ||
1611 | return false; | |
1612 | } | |
1613 | ||
1614 | /* | |
1615 | * Just check that the device is there and active | |
94ae8522 RKAL |
1616 | * TODO: turn this bit on/off depending on the number of physical channels |
1617 | * actually used, if it is zero... well shut it off. That will save some | |
1618 | * power. Cut the clock at the same time. | |
e8689e63 LW |
1619 | */ |
1620 | static void pl08x_ensure_on(struct pl08x_driver_data *pl08x) | |
1621 | { | |
affa115e LW |
1622 | /* The Nomadik variant does not have the config register */ |
1623 | if (pl08x->vd->nomadik) | |
1624 | return; | |
48a59ef3 | 1625 | writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG); |
e8689e63 LW |
1626 | } |
1627 | ||
3d992e1a RKAL |
1628 | static void pl08x_unmap_buffers(struct pl08x_txd *txd) |
1629 | { | |
1630 | struct device *dev = txd->tx.chan->device->dev; | |
b7f69d9d | 1631 | struct pl08x_sg *dsg; |
3d992e1a RKAL |
1632 | |
1633 | if (!(txd->tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { | |
1634 | if (txd->tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE) | |
b7f69d9d VK |
1635 | list_for_each_entry(dsg, &txd->dsg_list, node) |
1636 | dma_unmap_single(dev, dsg->src_addr, dsg->len, | |
1637 | DMA_TO_DEVICE); | |
1638 | else { | |
1639 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
1640 | dma_unmap_page(dev, dsg->src_addr, dsg->len, | |
1641 | DMA_TO_DEVICE); | |
1642 | } | |
3d992e1a RKAL |
1643 | } |
1644 | if (!(txd->tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { | |
1645 | if (txd->tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE) | |
b7f69d9d VK |
1646 | list_for_each_entry(dsg, &txd->dsg_list, node) |
1647 | dma_unmap_single(dev, dsg->dst_addr, dsg->len, | |
1648 | DMA_FROM_DEVICE); | |
3d992e1a | 1649 | else |
b7f69d9d VK |
1650 | list_for_each_entry(dsg, &txd->dsg_list, node) |
1651 | dma_unmap_page(dev, dsg->dst_addr, dsg->len, | |
1652 | DMA_FROM_DEVICE); | |
3d992e1a RKAL |
1653 | } |
1654 | } | |
1655 | ||
e8689e63 LW |
1656 | static void pl08x_tasklet(unsigned long data) |
1657 | { | |
1658 | struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data; | |
e8689e63 | 1659 | struct pl08x_driver_data *pl08x = plchan->host; |
858c21c0 | 1660 | struct pl08x_txd *txd; |
bf072af4 | 1661 | unsigned long flags; |
e8689e63 | 1662 | |
bf072af4 | 1663 | spin_lock_irqsave(&plchan->lock, flags); |
e8689e63 | 1664 | |
858c21c0 RKAL |
1665 | txd = plchan->at; |
1666 | plchan->at = NULL; | |
e8689e63 | 1667 | |
858c21c0 | 1668 | if (txd) { |
94ae8522 | 1669 | /* Update last completed */ |
f7fbce07 | 1670 | dma_cookie_complete(&txd->tx); |
e8689e63 | 1671 | } |
8087aacd | 1672 | |
94ae8522 | 1673 | /* If a new descriptor is queued, set it up plchan->at is NULL here */ |
15c17232 | 1674 | if (!list_empty(&plchan->pend_list)) { |
e8689e63 LW |
1675 | struct pl08x_txd *next; |
1676 | ||
15c17232 | 1677 | next = list_first_entry(&plchan->pend_list, |
e8689e63 LW |
1678 | struct pl08x_txd, |
1679 | node); | |
1680 | list_del(&next->node); | |
c885bee4 RKAL |
1681 | |
1682 | pl08x_start_txd(plchan, next); | |
8087aacd RKAL |
1683 | } else if (plchan->phychan_hold) { |
1684 | /* | |
1685 | * This channel is still in use - we have a new txd being | |
1686 | * prepared and will soon be queued. Don't give up the | |
1687 | * physical channel. | |
1688 | */ | |
e8689e63 LW |
1689 | } else { |
1690 | struct pl08x_dma_chan *waiting = NULL; | |
1691 | ||
1692 | /* | |
1693 | * No more jobs, so free up the physical channel | |
1694 | * Free any allocated signal on slave transfers too | |
1695 | */ | |
8c8cc2b1 | 1696 | release_phy_channel(plchan); |
e8689e63 LW |
1697 | plchan->state = PL08X_CHAN_IDLE; |
1698 | ||
1699 | /* | |
94ae8522 RKAL |
1700 | * And NOW before anyone else can grab that free:d up |
1701 | * physical channel, see if there is some memcpy pending | |
1702 | * that seriously needs to start because of being stacked | |
1703 | * up while we were choking the physical channels with data. | |
e8689e63 LW |
1704 | */ |
1705 | list_for_each_entry(waiting, &pl08x->memcpy.channels, | |
1706 | chan.device_node) { | |
3e27ee84 VK |
1707 | if (waiting->state == PL08X_CHAN_WAITING && |
1708 | waiting->waiting != NULL) { | |
e8689e63 LW |
1709 | int ret; |
1710 | ||
1711 | /* This should REALLY not fail now */ | |
1712 | ret = prep_phy_channel(waiting, | |
1713 | waiting->waiting); | |
1714 | BUG_ON(ret); | |
8087aacd | 1715 | waiting->phychan_hold--; |
e8689e63 LW |
1716 | waiting->state = PL08X_CHAN_RUNNING; |
1717 | waiting->waiting = NULL; | |
1718 | pl08x_issue_pending(&waiting->chan); | |
1719 | break; | |
1720 | } | |
1721 | } | |
1722 | } | |
1723 | ||
bf072af4 | 1724 | spin_unlock_irqrestore(&plchan->lock, flags); |
858c21c0 | 1725 | |
3d992e1a RKAL |
1726 | if (txd) { |
1727 | dma_async_tx_callback callback = txd->tx.callback; | |
1728 | void *callback_param = txd->tx.callback_param; | |
1729 | ||
1730 | /* Don't try to unmap buffers on slave channels */ | |
1731 | if (!plchan->slave) | |
1732 | pl08x_unmap_buffers(txd); | |
1733 | ||
1734 | /* Free the descriptor */ | |
1735 | spin_lock_irqsave(&plchan->lock, flags); | |
1736 | pl08x_free_txd(pl08x, txd); | |
1737 | spin_unlock_irqrestore(&plchan->lock, flags); | |
1738 | ||
1739 | /* Callback to signal completion */ | |
1740 | if (callback) | |
1741 | callback(callback_param); | |
1742 | } | |
e8689e63 LW |
1743 | } |
1744 | ||
1745 | static irqreturn_t pl08x_irq(int irq, void *dev) | |
1746 | { | |
1747 | struct pl08x_driver_data *pl08x = dev; | |
28da2836 VK |
1748 | u32 mask = 0, err, tc, i; |
1749 | ||
1750 | /* check & clear - ERR & TC interrupts */ | |
1751 | err = readl(pl08x->base + PL080_ERR_STATUS); | |
1752 | if (err) { | |
1753 | dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n", | |
1754 | __func__, err); | |
1755 | writel(err, pl08x->base + PL080_ERR_CLEAR); | |
e8689e63 | 1756 | } |
d29bf019 | 1757 | tc = readl(pl08x->base + PL080_TC_STATUS); |
28da2836 VK |
1758 | if (tc) |
1759 | writel(tc, pl08x->base + PL080_TC_CLEAR); | |
1760 | ||
1761 | if (!err && !tc) | |
1762 | return IRQ_NONE; | |
1763 | ||
e8689e63 | 1764 | for (i = 0; i < pl08x->vd->channels; i++) { |
28da2836 | 1765 | if (((1 << i) & err) || ((1 << i) & tc)) { |
e8689e63 LW |
1766 | /* Locate physical channel */ |
1767 | struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i]; | |
1768 | struct pl08x_dma_chan *plchan = phychan->serving; | |
1769 | ||
28da2836 VK |
1770 | if (!plchan) { |
1771 | dev_err(&pl08x->adev->dev, | |
1772 | "%s Error TC interrupt on unused channel: 0x%08x\n", | |
1773 | __func__, i); | |
1774 | continue; | |
1775 | } | |
1776 | ||
e8689e63 LW |
1777 | /* Schedule tasklet on this channel */ |
1778 | tasklet_schedule(&plchan->tasklet); | |
e8689e63 LW |
1779 | mask |= (1 << i); |
1780 | } | |
1781 | } | |
e8689e63 LW |
1782 | |
1783 | return mask ? IRQ_HANDLED : IRQ_NONE; | |
1784 | } | |
1785 | ||
121c8476 RKAL |
1786 | static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan) |
1787 | { | |
1788 | u32 cctl = pl08x_cctl(chan->cd->cctl); | |
1789 | ||
1790 | chan->slave = true; | |
1791 | chan->name = chan->cd->bus_id; | |
ed91c13d RK |
1792 | chan->cfg.src_addr = chan->cd->addr; |
1793 | chan->cfg.dst_addr = chan->cd->addr; | |
121c8476 RKAL |
1794 | chan->src_cctl = cctl | PL080_CONTROL_DST_INCR | |
1795 | pl08x_select_bus(chan->cd->periph_buses, chan->host->mem_buses); | |
1796 | chan->dst_cctl = cctl | PL080_CONTROL_SRC_INCR | | |
1797 | pl08x_select_bus(chan->host->mem_buses, chan->cd->periph_buses); | |
1798 | } | |
1799 | ||
e8689e63 LW |
1800 | /* |
1801 | * Initialise the DMAC memcpy/slave channels. | |
1802 | * Make a local wrapper to hold required data | |
1803 | */ | |
1804 | static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, | |
3e27ee84 | 1805 | struct dma_device *dmadev, unsigned int channels, bool slave) |
e8689e63 LW |
1806 | { |
1807 | struct pl08x_dma_chan *chan; | |
1808 | int i; | |
1809 | ||
1810 | INIT_LIST_HEAD(&dmadev->channels); | |
94ae8522 | 1811 | |
e8689e63 LW |
1812 | /* |
1813 | * Register as many many memcpy as we have physical channels, | |
1814 | * we won't always be able to use all but the code will have | |
1815 | * to cope with that situation. | |
1816 | */ | |
1817 | for (i = 0; i < channels; i++) { | |
b201c111 | 1818 | chan = kzalloc(sizeof(*chan), GFP_KERNEL); |
e8689e63 LW |
1819 | if (!chan) { |
1820 | dev_err(&pl08x->adev->dev, | |
1821 | "%s no memory for channel\n", __func__); | |
1822 | return -ENOMEM; | |
1823 | } | |
1824 | ||
1825 | chan->host = pl08x; | |
1826 | chan->state = PL08X_CHAN_IDLE; | |
1827 | ||
1828 | if (slave) { | |
e8689e63 | 1829 | chan->cd = &pl08x->pd->slave_channels[i]; |
121c8476 | 1830 | pl08x_dma_slave_init(chan); |
e8689e63 LW |
1831 | } else { |
1832 | chan->cd = &pl08x->pd->memcpy_channel; | |
1833 | chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i); | |
1834 | if (!chan->name) { | |
1835 | kfree(chan); | |
1836 | return -ENOMEM; | |
1837 | } | |
1838 | } | |
175a5e61 | 1839 | dev_dbg(&pl08x->adev->dev, |
e8689e63 LW |
1840 | "initialize virtual channel \"%s\"\n", |
1841 | chan->name); | |
1842 | ||
1843 | chan->chan.device = dmadev; | |
d3ee98cd | 1844 | dma_cookie_init(&chan->chan); |
e8689e63 LW |
1845 | |
1846 | spin_lock_init(&chan->lock); | |
15c17232 | 1847 | INIT_LIST_HEAD(&chan->pend_list); |
e8689e63 LW |
1848 | tasklet_init(&chan->tasklet, pl08x_tasklet, |
1849 | (unsigned long) chan); | |
1850 | ||
1851 | list_add_tail(&chan->chan.device_node, &dmadev->channels); | |
1852 | } | |
1853 | dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n", | |
1854 | i, slave ? "slave" : "memcpy"); | |
1855 | return i; | |
1856 | } | |
1857 | ||
1858 | static void pl08x_free_virtual_channels(struct dma_device *dmadev) | |
1859 | { | |
1860 | struct pl08x_dma_chan *chan = NULL; | |
1861 | struct pl08x_dma_chan *next; | |
1862 | ||
1863 | list_for_each_entry_safe(chan, | |
1864 | next, &dmadev->channels, chan.device_node) { | |
1865 | list_del(&chan->chan.device_node); | |
1866 | kfree(chan); | |
1867 | } | |
1868 | } | |
1869 | ||
1870 | #ifdef CONFIG_DEBUG_FS | |
1871 | static const char *pl08x_state_str(enum pl08x_dma_chan_state state) | |
1872 | { | |
1873 | switch (state) { | |
1874 | case PL08X_CHAN_IDLE: | |
1875 | return "idle"; | |
1876 | case PL08X_CHAN_RUNNING: | |
1877 | return "running"; | |
1878 | case PL08X_CHAN_PAUSED: | |
1879 | return "paused"; | |
1880 | case PL08X_CHAN_WAITING: | |
1881 | return "waiting"; | |
1882 | default: | |
1883 | break; | |
1884 | } | |
1885 | return "UNKNOWN STATE"; | |
1886 | } | |
1887 | ||
1888 | static int pl08x_debugfs_show(struct seq_file *s, void *data) | |
1889 | { | |
1890 | struct pl08x_driver_data *pl08x = s->private; | |
1891 | struct pl08x_dma_chan *chan; | |
1892 | struct pl08x_phy_chan *ch; | |
1893 | unsigned long flags; | |
1894 | int i; | |
1895 | ||
1896 | seq_printf(s, "PL08x physical channels:\n"); | |
1897 | seq_printf(s, "CHANNEL:\tUSER:\n"); | |
1898 | seq_printf(s, "--------\t-----\n"); | |
1899 | for (i = 0; i < pl08x->vd->channels; i++) { | |
1900 | struct pl08x_dma_chan *virt_chan; | |
1901 | ||
1902 | ch = &pl08x->phy_chans[i]; | |
1903 | ||
1904 | spin_lock_irqsave(&ch->lock, flags); | |
1905 | virt_chan = ch->serving; | |
1906 | ||
affa115e LW |
1907 | seq_printf(s, "%d\t\t%s%s\n", |
1908 | ch->id, | |
1909 | virt_chan ? virt_chan->name : "(none)", | |
1910 | ch->locked ? " LOCKED" : ""); | |
e8689e63 LW |
1911 | |
1912 | spin_unlock_irqrestore(&ch->lock, flags); | |
1913 | } | |
1914 | ||
1915 | seq_printf(s, "\nPL08x virtual memcpy channels:\n"); | |
1916 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
1917 | seq_printf(s, "--------\t------\n"); | |
1918 | list_for_each_entry(chan, &pl08x->memcpy.channels, chan.device_node) { | |
3e2a037c | 1919 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
1920 | pl08x_state_str(chan->state)); |
1921 | } | |
1922 | ||
1923 | seq_printf(s, "\nPL08x virtual slave channels:\n"); | |
1924 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
1925 | seq_printf(s, "--------\t------\n"); | |
1926 | list_for_each_entry(chan, &pl08x->slave.channels, chan.device_node) { | |
3e2a037c | 1927 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
1928 | pl08x_state_str(chan->state)); |
1929 | } | |
1930 | ||
1931 | return 0; | |
1932 | } | |
1933 | ||
1934 | static int pl08x_debugfs_open(struct inode *inode, struct file *file) | |
1935 | { | |
1936 | return single_open(file, pl08x_debugfs_show, inode->i_private); | |
1937 | } | |
1938 | ||
1939 | static const struct file_operations pl08x_debugfs_operations = { | |
1940 | .open = pl08x_debugfs_open, | |
1941 | .read = seq_read, | |
1942 | .llseek = seq_lseek, | |
1943 | .release = single_release, | |
1944 | }; | |
1945 | ||
1946 | static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
1947 | { | |
1948 | /* Expose a simple debugfs interface to view all clocks */ | |
3e27ee84 VK |
1949 | (void) debugfs_create_file(dev_name(&pl08x->adev->dev), |
1950 | S_IFREG | S_IRUGO, NULL, pl08x, | |
1951 | &pl08x_debugfs_operations); | |
e8689e63 LW |
1952 | } |
1953 | ||
1954 | #else | |
1955 | static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
1956 | { | |
1957 | } | |
1958 | #endif | |
1959 | ||
aa25afad | 1960 | static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) |
e8689e63 LW |
1961 | { |
1962 | struct pl08x_driver_data *pl08x; | |
f96ca9ec | 1963 | const struct vendor_data *vd = id->data; |
e8689e63 LW |
1964 | int ret = 0; |
1965 | int i; | |
1966 | ||
1967 | ret = amba_request_regions(adev, NULL); | |
1968 | if (ret) | |
1969 | return ret; | |
1970 | ||
1971 | /* Create the driver state holder */ | |
b201c111 | 1972 | pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL); |
e8689e63 LW |
1973 | if (!pl08x) { |
1974 | ret = -ENOMEM; | |
1975 | goto out_no_pl08x; | |
1976 | } | |
1977 | ||
1978 | /* Initialize memcpy engine */ | |
1979 | dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask); | |
1980 | pl08x->memcpy.dev = &adev->dev; | |
1981 | pl08x->memcpy.device_alloc_chan_resources = pl08x_alloc_chan_resources; | |
1982 | pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources; | |
1983 | pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy; | |
1984 | pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
1985 | pl08x->memcpy.device_tx_status = pl08x_dma_tx_status; | |
1986 | pl08x->memcpy.device_issue_pending = pl08x_issue_pending; | |
1987 | pl08x->memcpy.device_control = pl08x_control; | |
1988 | ||
1989 | /* Initialize slave engine */ | |
1990 | dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask); | |
1991 | pl08x->slave.dev = &adev->dev; | |
1992 | pl08x->slave.device_alloc_chan_resources = pl08x_alloc_chan_resources; | |
1993 | pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources; | |
1994 | pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
1995 | pl08x->slave.device_tx_status = pl08x_dma_tx_status; | |
1996 | pl08x->slave.device_issue_pending = pl08x_issue_pending; | |
1997 | pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg; | |
1998 | pl08x->slave.device_control = pl08x_control; | |
1999 | ||
2000 | /* Get the platform data */ | |
2001 | pl08x->pd = dev_get_platdata(&adev->dev); | |
2002 | if (!pl08x->pd) { | |
2003 | dev_err(&adev->dev, "no platform data supplied\n"); | |
2004 | goto out_no_platdata; | |
2005 | } | |
2006 | ||
2007 | /* Assign useful pointers to the driver state */ | |
2008 | pl08x->adev = adev; | |
2009 | pl08x->vd = vd; | |
2010 | ||
30749cb4 RKAL |
2011 | /* By default, AHB1 only. If dualmaster, from platform */ |
2012 | pl08x->lli_buses = PL08X_AHB1; | |
2013 | pl08x->mem_buses = PL08X_AHB1; | |
2014 | if (pl08x->vd->dualmaster) { | |
2015 | pl08x->lli_buses = pl08x->pd->lli_buses; | |
2016 | pl08x->mem_buses = pl08x->pd->mem_buses; | |
2017 | } | |
2018 | ||
e8689e63 LW |
2019 | /* A DMA memory pool for LLIs, align on 1-byte boundary */ |
2020 | pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev, | |
2021 | PL08X_LLI_TSFR_SIZE, PL08X_ALIGN, 0); | |
2022 | if (!pl08x->pool) { | |
2023 | ret = -ENOMEM; | |
2024 | goto out_no_lli_pool; | |
2025 | } | |
2026 | ||
e8689e63 LW |
2027 | pl08x->base = ioremap(adev->res.start, resource_size(&adev->res)); |
2028 | if (!pl08x->base) { | |
2029 | ret = -ENOMEM; | |
2030 | goto out_no_ioremap; | |
2031 | } | |
2032 | ||
2033 | /* Turn on the PL08x */ | |
2034 | pl08x_ensure_on(pl08x); | |
2035 | ||
94ae8522 | 2036 | /* Attach the interrupt handler */ |
e8689e63 LW |
2037 | writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR); |
2038 | writel(0x000000FF, pl08x->base + PL080_TC_CLEAR); | |
2039 | ||
2040 | ret = request_irq(adev->irq[0], pl08x_irq, IRQF_DISABLED, | |
b05cd8f4 | 2041 | DRIVER_NAME, pl08x); |
e8689e63 LW |
2042 | if (ret) { |
2043 | dev_err(&adev->dev, "%s failed to request interrupt %d\n", | |
2044 | __func__, adev->irq[0]); | |
2045 | goto out_no_irq; | |
2046 | } | |
2047 | ||
2048 | /* Initialize physical channels */ | |
affa115e | 2049 | pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)), |
e8689e63 LW |
2050 | GFP_KERNEL); |
2051 | if (!pl08x->phy_chans) { | |
2052 | dev_err(&adev->dev, "%s failed to allocate " | |
2053 | "physical channel holders\n", | |
2054 | __func__); | |
2055 | goto out_no_phychans; | |
2056 | } | |
2057 | ||
2058 | for (i = 0; i < vd->channels; i++) { | |
2059 | struct pl08x_phy_chan *ch = &pl08x->phy_chans[i]; | |
2060 | ||
2061 | ch->id = i; | |
2062 | ch->base = pl08x->base + PL080_Cx_BASE(i); | |
2063 | spin_lock_init(&ch->lock); | |
e8689e63 | 2064 | ch->signal = -1; |
affa115e LW |
2065 | |
2066 | /* | |
2067 | * Nomadik variants can have channels that are locked | |
2068 | * down for the secure world only. Lock up these channels | |
2069 | * by perpetually serving a dummy virtual channel. | |
2070 | */ | |
2071 | if (vd->nomadik) { | |
2072 | u32 val; | |
2073 | ||
2074 | val = readl(ch->base + PL080_CH_CONFIG); | |
2075 | if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) { | |
2076 | dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i); | |
2077 | ch->locked = true; | |
2078 | } | |
2079 | } | |
2080 | ||
175a5e61 VK |
2081 | dev_dbg(&adev->dev, "physical channel %d is %s\n", |
2082 | i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE"); | |
e8689e63 LW |
2083 | } |
2084 | ||
2085 | /* Register as many memcpy channels as there are physical channels */ | |
2086 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy, | |
2087 | pl08x->vd->channels, false); | |
2088 | if (ret <= 0) { | |
2089 | dev_warn(&pl08x->adev->dev, | |
2090 | "%s failed to enumerate memcpy channels - %d\n", | |
2091 | __func__, ret); | |
2092 | goto out_no_memcpy; | |
2093 | } | |
2094 | pl08x->memcpy.chancnt = ret; | |
2095 | ||
2096 | /* Register slave channels */ | |
2097 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave, | |
3e27ee84 | 2098 | pl08x->pd->num_slave_channels, true); |
e8689e63 LW |
2099 | if (ret <= 0) { |
2100 | dev_warn(&pl08x->adev->dev, | |
2101 | "%s failed to enumerate slave channels - %d\n", | |
2102 | __func__, ret); | |
2103 | goto out_no_slave; | |
2104 | } | |
2105 | pl08x->slave.chancnt = ret; | |
2106 | ||
2107 | ret = dma_async_device_register(&pl08x->memcpy); | |
2108 | if (ret) { | |
2109 | dev_warn(&pl08x->adev->dev, | |
2110 | "%s failed to register memcpy as an async device - %d\n", | |
2111 | __func__, ret); | |
2112 | goto out_no_memcpy_reg; | |
2113 | } | |
2114 | ||
2115 | ret = dma_async_device_register(&pl08x->slave); | |
2116 | if (ret) { | |
2117 | dev_warn(&pl08x->adev->dev, | |
2118 | "%s failed to register slave as an async device - %d\n", | |
2119 | __func__, ret); | |
2120 | goto out_no_slave_reg; | |
2121 | } | |
2122 | ||
2123 | amba_set_drvdata(adev, pl08x); | |
2124 | init_pl08x_debugfs(pl08x); | |
b05cd8f4 RKAL |
2125 | dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n", |
2126 | amba_part(adev), amba_rev(adev), | |
2127 | (unsigned long long)adev->res.start, adev->irq[0]); | |
b7b6018b | 2128 | |
e8689e63 LW |
2129 | return 0; |
2130 | ||
2131 | out_no_slave_reg: | |
2132 | dma_async_device_unregister(&pl08x->memcpy); | |
2133 | out_no_memcpy_reg: | |
2134 | pl08x_free_virtual_channels(&pl08x->slave); | |
2135 | out_no_slave: | |
2136 | pl08x_free_virtual_channels(&pl08x->memcpy); | |
2137 | out_no_memcpy: | |
2138 | kfree(pl08x->phy_chans); | |
2139 | out_no_phychans: | |
2140 | free_irq(adev->irq[0], pl08x); | |
2141 | out_no_irq: | |
2142 | iounmap(pl08x->base); | |
2143 | out_no_ioremap: | |
2144 | dma_pool_destroy(pl08x->pool); | |
2145 | out_no_lli_pool: | |
2146 | out_no_platdata: | |
2147 | kfree(pl08x); | |
2148 | out_no_pl08x: | |
2149 | amba_release_regions(adev); | |
2150 | return ret; | |
2151 | } | |
2152 | ||
2153 | /* PL080 has 8 channels and the PL080 have just 2 */ | |
2154 | static struct vendor_data vendor_pl080 = { | |
e8689e63 LW |
2155 | .channels = 8, |
2156 | .dualmaster = true, | |
2157 | }; | |
2158 | ||
affa115e LW |
2159 | static struct vendor_data vendor_nomadik = { |
2160 | .channels = 8, | |
2161 | .dualmaster = true, | |
2162 | .nomadik = true, | |
2163 | }; | |
2164 | ||
e8689e63 | 2165 | static struct vendor_data vendor_pl081 = { |
e8689e63 LW |
2166 | .channels = 2, |
2167 | .dualmaster = false, | |
2168 | }; | |
2169 | ||
2170 | static struct amba_id pl08x_ids[] = { | |
2171 | /* PL080 */ | |
2172 | { | |
2173 | .id = 0x00041080, | |
2174 | .mask = 0x000fffff, | |
2175 | .data = &vendor_pl080, | |
2176 | }, | |
2177 | /* PL081 */ | |
2178 | { | |
2179 | .id = 0x00041081, | |
2180 | .mask = 0x000fffff, | |
2181 | .data = &vendor_pl081, | |
2182 | }, | |
2183 | /* Nomadik 8815 PL080 variant */ | |
2184 | { | |
affa115e | 2185 | .id = 0x00280080, |
e8689e63 | 2186 | .mask = 0x00ffffff, |
affa115e | 2187 | .data = &vendor_nomadik, |
e8689e63 LW |
2188 | }, |
2189 | { 0, 0 }, | |
2190 | }; | |
2191 | ||
037566df DM |
2192 | MODULE_DEVICE_TABLE(amba, pl08x_ids); |
2193 | ||
e8689e63 LW |
2194 | static struct amba_driver pl08x_amba_driver = { |
2195 | .drv.name = DRIVER_NAME, | |
2196 | .id_table = pl08x_ids, | |
2197 | .probe = pl08x_probe, | |
2198 | }; | |
2199 | ||
2200 | static int __init pl08x_init(void) | |
2201 | { | |
2202 | int retval; | |
2203 | retval = amba_driver_register(&pl08x_amba_driver); | |
2204 | if (retval) | |
2205 | printk(KERN_WARNING DRIVER_NAME | |
e8b5e11d | 2206 | "failed to register as an AMBA device (%d)\n", |
e8689e63 LW |
2207 | retval); |
2208 | return retval; | |
2209 | } | |
2210 | subsys_initcall(pl08x_init); |