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USB: isp116x-hcd - use resource_size instead of defining its own resource_len macro
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / spi / spi_s3c64xx.c
blobc3038da2648aa4e621b0e6127b89c3017724cb55
1 /* linux/drivers/spi/spi_s3c64xx.c
2 *
3 * Copyright (C) 2009 Samsung Electronics Ltd.
4 * Jaswinder Singh <jassi.brar@samsung.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/workqueue.h>
24 #include <linux/delay.h>
25 #include <linux/clk.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/platform_device.h>
28 #include <linux/spi/spi.h>
29
30 #include <mach/dma.h>
31 #include <plat/s3c64xx-spi.h>
32
33 /* Registers and bit-fields */
34
35 #define S3C64XX_SPI_CH_CFG 0x00
36 #define S3C64XX_SPI_CLK_CFG 0x04
37 #define S3C64XX_SPI_MODE_CFG 0x08
38 #define S3C64XX_SPI_SLAVE_SEL 0x0C
39 #define S3C64XX_SPI_INT_EN 0x10
40 #define S3C64XX_SPI_STATUS 0x14
41 #define S3C64XX_SPI_TX_DATA 0x18
42 #define S3C64XX_SPI_RX_DATA 0x1C
43 #define S3C64XX_SPI_PACKET_CNT 0x20
44 #define S3C64XX_SPI_PENDING_CLR 0x24
45 #define S3C64XX_SPI_SWAP_CFG 0x28
46 #define S3C64XX_SPI_FB_CLK 0x2C
47
48 #define S3C64XX_SPI_CH_HS_EN (1<<6) /* High Speed Enable */
49 #define S3C64XX_SPI_CH_SW_RST (1<<5)
50 #define S3C64XX_SPI_CH_SLAVE (1<<4)
51 #define S3C64XX_SPI_CPOL_L (1<<3)
52 #define S3C64XX_SPI_CPHA_B (1<<2)
53 #define S3C64XX_SPI_CH_RXCH_ON (1<<1)
54 #define S3C64XX_SPI_CH_TXCH_ON (1<<0)
55
56 #define S3C64XX_SPI_CLKSEL_SRCMSK (3<<9)
57 #define S3C64XX_SPI_CLKSEL_SRCSHFT 9
58 #define S3C64XX_SPI_ENCLK_ENABLE (1<<8)
59 #define S3C64XX_SPI_PSR_MASK 0xff
60
61 #define S3C64XX_SPI_MODE_CH_TSZ_BYTE (0<<29)
62 #define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD (1<<29)
63 #define S3C64XX_SPI_MODE_CH_TSZ_WORD (2<<29)
64 #define S3C64XX_SPI_MODE_CH_TSZ_MASK (3<<29)
65 #define S3C64XX_SPI_MODE_BUS_TSZ_BYTE (0<<17)
66 #define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17)
67 #define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17)
68 #define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17)
69 #define S3C64XX_SPI_MODE_RXDMA_ON (1<<2)
70 #define S3C64XX_SPI_MODE_TXDMA_ON (1<<1)
71 #define S3C64XX_SPI_MODE_4BURST (1<<0)
72
73 #define S3C64XX_SPI_SLAVE_AUTO (1<<1)
74 #define S3C64XX_SPI_SLAVE_SIG_INACT (1<<0)
75
76 #define S3C64XX_SPI_ACT(c) writel(0, (c)->regs + S3C64XX_SPI_SLAVE_SEL)
77
78 #define S3C64XX_SPI_DEACT(c) writel(S3C64XX_SPI_SLAVE_SIG_INACT, \
79 (c)->regs + S3C64XX_SPI_SLAVE_SEL)
80
81 #define S3C64XX_SPI_INT_TRAILING_EN (1<<6)
82 #define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5)
83 #define S3C64XX_SPI_INT_RX_UNDERRUN_EN (1<<4)
84 #define S3C64XX_SPI_INT_TX_OVERRUN_EN (1<<3)
85 #define S3C64XX_SPI_INT_TX_UNDERRUN_EN (1<<2)
86 #define S3C64XX_SPI_INT_RX_FIFORDY_EN (1<<1)
87 #define S3C64XX_SPI_INT_TX_FIFORDY_EN (1<<0)
88
89 #define S3C64XX_SPI_ST_RX_OVERRUN_ERR (1<<5)
90 #define S3C64XX_SPI_ST_RX_UNDERRUN_ERR (1<<4)
91 #define S3C64XX_SPI_ST_TX_OVERRUN_ERR (1<<3)
92 #define S3C64XX_SPI_ST_TX_UNDERRUN_ERR (1<<2)
93 #define S3C64XX_SPI_ST_RX_FIFORDY (1<<1)
94 #define S3C64XX_SPI_ST_TX_FIFORDY (1<<0)
95
96 #define S3C64XX_SPI_PACKET_CNT_EN (1<<16)
97
98 #define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4)
99 #define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3)
100 #define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2)
101 #define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1)
102 #define S3C64XX_SPI_PND_TRAILING_CLR (1<<0)
103
104 #define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7)
105 #define S3C64XX_SPI_SWAP_RX_BYTE (1<<6)
106 #define S3C64XX_SPI_SWAP_RX_BIT (1<<5)
107 #define S3C64XX_SPI_SWAP_RX_EN (1<<4)
108 #define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3)
109 #define S3C64XX_SPI_SWAP_TX_BYTE (1<<2)
110 #define S3C64XX_SPI_SWAP_TX_BIT (1<<1)
111 #define S3C64XX_SPI_SWAP_TX_EN (1<<0)
112
113 #define S3C64XX_SPI_FBCLK_MSK (3<<0)
114
115 #define S3C64XX_SPI_ST_TRLCNTZ(v, i) ((((v) >> (i)->rx_lvl_offset) & \
116 (((i)->fifo_lvl_mask + 1))) \
117 ? 1 : 0)
118
119 #define S3C64XX_SPI_ST_TX_DONE(v, i) ((((v) >> (i)->rx_lvl_offset) & \
120 (((i)->fifo_lvl_mask + 1) << 1)) \
121 ? 1 : 0)
122 #define TX_FIFO_LVL(v, i) (((v) >> 6) & (i)->fifo_lvl_mask)
123 #define RX_FIFO_LVL(v, i) (((v) >> (i)->rx_lvl_offset) & (i)->fifo_lvl_mask)
124
125 #define S3C64XX_SPI_MAX_TRAILCNT 0x3ff
126 #define S3C64XX_SPI_TRAILCNT_OFF 19
127
128 #define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT
129
130 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
131
132 #define SUSPND (1<<0)
133 #define SPIBUSY (1<<1)
134 #define RXBUSY (1<<2)
135 #define TXBUSY (1<<3)
136
137 /**
138 * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
139 * @clk: Pointer to the spi clock.
140 * @src_clk: Pointer to the clock used to generate SPI signals.
141 * @master: Pointer to the SPI Protocol master.
142 * @workqueue: Work queue for the SPI xfer requests.
143 * @cntrlr_info: Platform specific data for the controller this driver manages.
144 * @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint.
145 * @work: Work
146 * @queue: To log SPI xfer requests.
147 * @lock: Controller specific lock.
148 * @state: Set of FLAGS to indicate status.
149 * @rx_dmach: Controller's DMA channel for Rx.
150 * @tx_dmach: Controller's DMA channel for Tx.
151 * @sfr_start: BUS address of SPI controller regs.
152 * @regs: Pointer to ioremap'ed controller registers.
153 * @xfer_completion: To indicate completion of xfer task.
154 * @cur_mode: Stores the active configuration of the controller.
155 * @cur_bpw: Stores the active bits per word settings.
156 * @cur_speed: Stores the active xfer clock speed.
157 */
158 struct s3c64xx_spi_driver_data {
159 void __iomem *regs;
160 struct clk *clk;
161 struct clk *src_clk;
162 struct platform_device *pdev;
163 struct spi_master *master;
164 struct workqueue_struct *workqueue;
165 struct s3c64xx_spi_info *cntrlr_info;
166 struct spi_device *tgl_spi;
167 struct work_struct work;
168 struct list_head queue;
169 spinlock_t lock;
170 enum dma_ch rx_dmach;
171 enum dma_ch tx_dmach;
172 unsigned long sfr_start;
173 struct completion xfer_completion;
174 unsigned state;
175 unsigned cur_mode, cur_bpw;
176 unsigned cur_speed;
177 };
178
179 static struct s3c2410_dma_client s3c64xx_spi_dma_client = {
180 .name = "samsung-spi-dma",
181 };
182
183 static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
184 {
185 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
186 void __iomem *regs = sdd->regs;
187 unsigned long loops;
188 u32 val;
189
190 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
191
192 val = readl(regs + S3C64XX_SPI_CH_CFG);
193 val |= S3C64XX_SPI_CH_SW_RST;
194 val &= ~S3C64XX_SPI_CH_HS_EN;
195 writel(val, regs + S3C64XX_SPI_CH_CFG);
196
197 /* Flush TxFIFO*/
198 loops = msecs_to_loops(1);
199 do {
200 val = readl(regs + S3C64XX_SPI_STATUS);
201 } while (TX_FIFO_LVL(val, sci) && loops--);
202
203 if (loops == 0)
204 dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
205
206 /* Flush RxFIFO*/
207 loops = msecs_to_loops(1);
208 do {
209 val = readl(regs + S3C64XX_SPI_STATUS);
210 if (RX_FIFO_LVL(val, sci))
211 readl(regs + S3C64XX_SPI_RX_DATA);
212 else
213 break;
214 } while (loops--);
215
216 if (loops == 0)
217 dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
218
219 val = readl(regs + S3C64XX_SPI_CH_CFG);
220 val &= ~S3C64XX_SPI_CH_SW_RST;
221 writel(val, regs + S3C64XX_SPI_CH_CFG);
222
223 val = readl(regs + S3C64XX_SPI_MODE_CFG);
224 val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
225 writel(val, regs + S3C64XX_SPI_MODE_CFG);
226
227 val = readl(regs + S3C64XX_SPI_CH_CFG);
228 val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
229 writel(val, regs + S3C64XX_SPI_CH_CFG);
230 }
231
232 static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
233 struct spi_device *spi,
234 struct spi_transfer *xfer, int dma_mode)
235 {
236 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
237 void __iomem *regs = sdd->regs;
238 u32 modecfg, chcfg;
239
240 modecfg = readl(regs + S3C64XX_SPI_MODE_CFG);
241 modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
242
243 chcfg = readl(regs + S3C64XX_SPI_CH_CFG);
244 chcfg &= ~S3C64XX_SPI_CH_TXCH_ON;
245
246 if (dma_mode) {
247 chcfg &= ~S3C64XX_SPI_CH_RXCH_ON;
248 } else {
249 /* Always shift in data in FIFO, even if xfer is Tx only,
250 * this helps setting PCKT_CNT value for generating clocks
251 * as exactly needed.
252 */
253 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
254 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
255 | S3C64XX_SPI_PACKET_CNT_EN,
256 regs + S3C64XX_SPI_PACKET_CNT);
257 }
258
259 if (xfer->tx_buf != NULL) {
260 sdd->state |= TXBUSY;
261 chcfg |= S3C64XX_SPI_CH_TXCH_ON;
262 if (dma_mode) {
263 modecfg |= S3C64XX_SPI_MODE_TXDMA_ON;
264 s3c2410_dma_config(sdd->tx_dmach, 1);
265 s3c2410_dma_enqueue(sdd->tx_dmach, (void *)sdd,
266 xfer->tx_dma, xfer->len);
267 s3c2410_dma_ctrl(sdd->tx_dmach, S3C2410_DMAOP_START);
268 } else {
269 unsigned char *buf = (unsigned char *) xfer->tx_buf;
270 int i = 0;
271 while (i < xfer->len)
272 writeb(buf[i++], regs + S3C64XX_SPI_TX_DATA);
273 }
274 }
275
276 if (xfer->rx_buf != NULL) {
277 sdd->state |= RXBUSY;
278
279 if (sci->high_speed && sdd->cur_speed >= 30000000UL
280 && !(sdd->cur_mode & SPI_CPHA))
281 chcfg |= S3C64XX_SPI_CH_HS_EN;
282
283 if (dma_mode) {
284 modecfg |= S3C64XX_SPI_MODE_RXDMA_ON;
285 chcfg |= S3C64XX_SPI_CH_RXCH_ON;
286 writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff)
287 | S3C64XX_SPI_PACKET_CNT_EN,
288 regs + S3C64XX_SPI_PACKET_CNT);
289 s3c2410_dma_config(sdd->rx_dmach, 1);
290 s3c2410_dma_enqueue(sdd->rx_dmach, (void *)sdd,
291 xfer->rx_dma, xfer->len);
292 s3c2410_dma_ctrl(sdd->rx_dmach, S3C2410_DMAOP_START);
293 }
294 }
295
296 writel(modecfg, regs + S3C64XX_SPI_MODE_CFG);
297 writel(chcfg, regs + S3C64XX_SPI_CH_CFG);
298 }
299
300 static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd,
301 struct spi_device *spi)
302 {
303 struct s3c64xx_spi_csinfo *cs;
304
305 if (sdd->tgl_spi != NULL) { /* If last device toggled after mssg */
306 if (sdd->tgl_spi != spi) { /* if last mssg on diff device */
307 /* Deselect the last toggled device */
308 cs = sdd->tgl_spi->controller_data;
309 cs->set_level(cs->line,
310 spi->mode & SPI_CS_HIGH ? 0 : 1);
311 }
312 sdd->tgl_spi = NULL;
313 }
314
315 cs = spi->controller_data;
316 cs->set_level(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0);
317 }
318
319 static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd,
320 struct spi_transfer *xfer, int dma_mode)
321 {
322 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
323 void __iomem *regs = sdd->regs;
324 unsigned long val;
325 int ms;
326
327 /* millisecs to xfer 'len' bytes @ 'cur_speed' */
328 ms = xfer->len * 8 * 1000 / sdd->cur_speed;
329 ms += 10; /* some tolerance */
330
331 if (dma_mode) {
332 val = msecs_to_jiffies(ms) + 10;
333 val = wait_for_completion_timeout(&sdd->xfer_completion, val);
334 } else {
335 u32 status;
336 val = msecs_to_loops(ms);
337 do {
338 status = readl(regs + S3C64XX_SPI_STATUS);
339 } while (RX_FIFO_LVL(status, sci) < xfer->len && --val);
340 }
341
342 if (!val)
343 return -EIO;
344
345 if (dma_mode) {
346 u32 status;
347
348 /*
349 * DmaTx returns after simply writing data in the FIFO,
350 * w/o waiting for real transmission on the bus to finish.
351 * DmaRx returns only after Dma read data from FIFO which
352 * needs bus transmission to finish, so we don't worry if
353 * Xfer involved Rx(with or without Tx).
354 */
355 if (xfer->rx_buf == NULL) {
356 val = msecs_to_loops(10);
357 status = readl(regs + S3C64XX_SPI_STATUS);
358 while ((TX_FIFO_LVL(status, sci)
359 || !S3C64XX_SPI_ST_TX_DONE(status, sci))
360 && --val) {
361 cpu_relax();
362 status = readl(regs + S3C64XX_SPI_STATUS);
363 }
364
365 if (!val)
366 return -EIO;
367 }
368 } else {
369 unsigned char *buf;
370 int i;
371
372 /* If it was only Tx */
373 if (xfer->rx_buf == NULL) {
374 sdd->state &= ~TXBUSY;
375 return 0;
376 }
377
378 i = 0;
379 buf = xfer->rx_buf;
380 while (i < xfer->len)
381 buf[i++] = readb(regs + S3C64XX_SPI_RX_DATA);
382
383 sdd->state &= ~RXBUSY;
384 }
385
386 return 0;
387 }
388
389 static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd,
390 struct spi_device *spi)
391 {
392 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
393
394 if (sdd->tgl_spi == spi)
395 sdd->tgl_spi = NULL;
396
397 cs->set_level(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1);
398 }
399
400 static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
401 {
402 void __iomem *regs = sdd->regs;
403 u32 val;
404
405 /* Disable Clock */
406 val = readl(regs + S3C64XX_SPI_CLK_CFG);
407 val &= ~S3C64XX_SPI_ENCLK_ENABLE;
408 writel(val, regs + S3C64XX_SPI_CLK_CFG);
409
410 /* Set Polarity and Phase */
411 val = readl(regs + S3C64XX_SPI_CH_CFG);
412 val &= ~(S3C64XX_SPI_CH_SLAVE |
413 S3C64XX_SPI_CPOL_L |
414 S3C64XX_SPI_CPHA_B);
415
416 if (sdd->cur_mode & SPI_CPOL)
417 val |= S3C64XX_SPI_CPOL_L;
418
419 if (sdd->cur_mode & SPI_CPHA)
420 val |= S3C64XX_SPI_CPHA_B;
421
422 writel(val, regs + S3C64XX_SPI_CH_CFG);
423
424 /* Set Channel & DMA Mode */
425 val = readl(regs + S3C64XX_SPI_MODE_CFG);
426 val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK
427 | S3C64XX_SPI_MODE_CH_TSZ_MASK);
428
429 switch (sdd->cur_bpw) {
430 case 32:
431 val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD;
432 break;
433 case 16:
434 val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
435 break;
436 default:
437 val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
438 break;
439 }
440 val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE; /* Always 8bits wide */
441
442 writel(val, regs + S3C64XX_SPI_MODE_CFG);
443
444 /* Configure Clock */
445 val = readl(regs + S3C64XX_SPI_CLK_CFG);
446 val &= ~S3C64XX_SPI_PSR_MASK;
447 val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1)
448 & S3C64XX_SPI_PSR_MASK);
449 writel(val, regs + S3C64XX_SPI_CLK_CFG);
450
451 /* Enable Clock */
452 val = readl(regs + S3C64XX_SPI_CLK_CFG);
453 val |= S3C64XX_SPI_ENCLK_ENABLE;
454 writel(val, regs + S3C64XX_SPI_CLK_CFG);
455 }
456
457 static void s3c64xx_spi_dma_rxcb(struct s3c2410_dma_chan *chan, void *buf_id,
458 int size, enum s3c2410_dma_buffresult res)
459 {
460 struct s3c64xx_spi_driver_data *sdd = buf_id;
461 unsigned long flags;
462
463 spin_lock_irqsave(&sdd->lock, flags);
464
465 if (res == S3C2410_RES_OK)
466 sdd->state &= ~RXBUSY;
467 else
468 dev_err(&sdd->pdev->dev, "DmaAbrtRx-%d\n", size);
469
470 /* If the other done */
471 if (!(sdd->state & TXBUSY))
472 complete(&sdd->xfer_completion);
473
474 spin_unlock_irqrestore(&sdd->lock, flags);
475 }
476
477 static void s3c64xx_spi_dma_txcb(struct s3c2410_dma_chan *chan, void *buf_id,
478 int size, enum s3c2410_dma_buffresult res)
479 {
480 struct s3c64xx_spi_driver_data *sdd = buf_id;
481 unsigned long flags;
482
483 spin_lock_irqsave(&sdd->lock, flags);
484
485 if (res == S3C2410_RES_OK)
486 sdd->state &= ~TXBUSY;
487 else
488 dev_err(&sdd->pdev->dev, "DmaAbrtTx-%d \n", size);
489
490 /* If the other done */
491 if (!(sdd->state & RXBUSY))
492 complete(&sdd->xfer_completion);
493
494 spin_unlock_irqrestore(&sdd->lock, flags);
495 }
496
497 #define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
498
499 static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
500 struct spi_message *msg)
501 {
502 struct device *dev = &sdd->pdev->dev;
503 struct spi_transfer *xfer;
504
505 if (msg->is_dma_mapped)
506 return 0;
507
508 /* First mark all xfer unmapped */
509 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
510 xfer->rx_dma = XFER_DMAADDR_INVALID;
511 xfer->tx_dma = XFER_DMAADDR_INVALID;
512 }
513
514 /* Map until end or first fail */
515 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
516
517 if (xfer->tx_buf != NULL) {
518 xfer->tx_dma = dma_map_single(dev,
519 (void *)xfer->tx_buf, xfer->len,
520 DMA_TO_DEVICE);
521 if (dma_mapping_error(dev, xfer->tx_dma)) {
522 dev_err(dev, "dma_map_single Tx failed\n");
523 xfer->tx_dma = XFER_DMAADDR_INVALID;
524 return -ENOMEM;
525 }
526 }
527
528 if (xfer->rx_buf != NULL) {
529 xfer->rx_dma = dma_map_single(dev, xfer->rx_buf,
530 xfer->len, DMA_FROM_DEVICE);
531 if (dma_mapping_error(dev, xfer->rx_dma)) {
532 dev_err(dev, "dma_map_single Rx failed\n");
533 dma_unmap_single(dev, xfer->tx_dma,
534 xfer->len, DMA_TO_DEVICE);
535 xfer->tx_dma = XFER_DMAADDR_INVALID;
536 xfer->rx_dma = XFER_DMAADDR_INVALID;
537 return -ENOMEM;
538 }
539 }
540 }
541
542 return 0;
543 }
544
545 static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
546 struct spi_message *msg)
547 {
548 struct device *dev = &sdd->pdev->dev;
549 struct spi_transfer *xfer;
550
551 if (msg->is_dma_mapped)
552 return;
553
554 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
555
556 if (xfer->rx_buf != NULL
557 && xfer->rx_dma != XFER_DMAADDR_INVALID)
558 dma_unmap_single(dev, xfer->rx_dma,
559 xfer->len, DMA_FROM_DEVICE);
560
561 if (xfer->tx_buf != NULL
562 && xfer->tx_dma != XFER_DMAADDR_INVALID)
563 dma_unmap_single(dev, xfer->tx_dma,
564 xfer->len, DMA_TO_DEVICE);
565 }
566 }
567
568 static void handle_msg(struct s3c64xx_spi_driver_data *sdd,
569 struct spi_message *msg)
570 {
571 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
572 struct spi_device *spi = msg->spi;
573 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
574 struct spi_transfer *xfer;
575 int status = 0, cs_toggle = 0;
576 u32 speed;
577 u8 bpw;
578
579 /* If Master's(controller) state differs from that needed by Slave */
580 if (sdd->cur_speed != spi->max_speed_hz
581 || sdd->cur_mode != spi->mode
582 || sdd->cur_bpw != spi->bits_per_word) {
583 sdd->cur_bpw = spi->bits_per_word;
584 sdd->cur_speed = spi->max_speed_hz;
585 sdd->cur_mode = spi->mode;
586 s3c64xx_spi_config(sdd);
587 }
588
589 /* Map all the transfers if needed */
590 if (s3c64xx_spi_map_mssg(sdd, msg)) {
591 dev_err(&spi->dev,
592 "Xfer: Unable to map message buffers!\n");
593 status = -ENOMEM;
594 goto out;
595 }
596
597 /* Configure feedback delay */
598 writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK);
599
600 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
601
602 unsigned long flags;
603 int use_dma;
604
605 INIT_COMPLETION(sdd->xfer_completion);
606
607 /* Only BPW and Speed may change across transfers */
608 bpw = xfer->bits_per_word ? : spi->bits_per_word;
609 speed = xfer->speed_hz ? : spi->max_speed_hz;
610
611 if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) {
612 sdd->cur_bpw = bpw;
613 sdd->cur_speed = speed;
614 s3c64xx_spi_config(sdd);
615 }
616
617 /* Polling method for xfers not bigger than FIFO capacity */
618 if (xfer->len <= ((sci->fifo_lvl_mask >> 1) + 1))
619 use_dma = 0;
620 else
621 use_dma = 1;
622
623 spin_lock_irqsave(&sdd->lock, flags);
624
625 /* Pending only which is to be done */
626 sdd->state &= ~RXBUSY;
627 sdd->state &= ~TXBUSY;
628
629 enable_datapath(sdd, spi, xfer, use_dma);
630
631 /* Slave Select */
632 enable_cs(sdd, spi);
633
634 /* Start the signals */
635 S3C64XX_SPI_ACT(sdd);
636
637 spin_unlock_irqrestore(&sdd->lock, flags);
638
639 status = wait_for_xfer(sdd, xfer, use_dma);
640
641 /* Quiese the signals */
642 S3C64XX_SPI_DEACT(sdd);
643
644 if (status) {
645 dev_err(&spi->dev, "I/O Error: "
646 "rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
647 xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
648 (sdd->state & RXBUSY) ? 'f' : 'p',
649 (sdd->state & TXBUSY) ? 'f' : 'p',
650 xfer->len);
651
652 if (use_dma) {
653 if (xfer->tx_buf != NULL
654 && (sdd->state & TXBUSY))
655 s3c2410_dma_ctrl(sdd->tx_dmach,
656 S3C2410_DMAOP_FLUSH);
657 if (xfer->rx_buf != NULL
658 && (sdd->state & RXBUSY))
659 s3c2410_dma_ctrl(sdd->rx_dmach,
660 S3C2410_DMAOP_FLUSH);
661 }
662
663 goto out;
664 }
665
666 if (xfer->delay_usecs)
667 udelay(xfer->delay_usecs);
668
669 if (xfer->cs_change) {
670 /* Hint that the next mssg is gonna be
671 for the same device */
672 if (list_is_last(&xfer->transfer_list,
673 &msg->transfers))
674 cs_toggle = 1;
675 else
676 disable_cs(sdd, spi);
677 }
678
679 msg->actual_length += xfer->len;
680
681 flush_fifo(sdd);
682 }
683
684 out:
685 if (!cs_toggle || status)
686 disable_cs(sdd, spi);
687 else
688 sdd->tgl_spi = spi;
689
690 s3c64xx_spi_unmap_mssg(sdd, msg);
691
692 msg->status = status;
693
694 if (msg->complete)
695 msg->complete(msg->context);
696 }
697
698 static int acquire_dma(struct s3c64xx_spi_driver_data *sdd)
699 {
700 if (s3c2410_dma_request(sdd->rx_dmach,
701 &s3c64xx_spi_dma_client, NULL) < 0) {
702 dev_err(&sdd->pdev->dev, "cannot get RxDMA\n");
703 return 0;
704 }
705 s3c2410_dma_set_buffdone_fn(sdd->rx_dmach, s3c64xx_spi_dma_rxcb);
706 s3c2410_dma_devconfig(sdd->rx_dmach, S3C2410_DMASRC_HW,
707 sdd->sfr_start + S3C64XX_SPI_RX_DATA);
708
709 if (s3c2410_dma_request(sdd->tx_dmach,
710 &s3c64xx_spi_dma_client, NULL) < 0) {
711 dev_err(&sdd->pdev->dev, "cannot get TxDMA\n");
712 s3c2410_dma_free(sdd->rx_dmach, &s3c64xx_spi_dma_client);
713 return 0;
714 }
715 s3c2410_dma_set_buffdone_fn(sdd->tx_dmach, s3c64xx_spi_dma_txcb);
716 s3c2410_dma_devconfig(sdd->tx_dmach, S3C2410_DMASRC_MEM,
717 sdd->sfr_start + S3C64XX_SPI_TX_DATA);
718
719 return 1;
720 }
721
722 static void s3c64xx_spi_work(struct work_struct *work)
723 {
724 struct s3c64xx_spi_driver_data *sdd = container_of(work,
725 struct s3c64xx_spi_driver_data, work);
726 unsigned long flags;
727
728 /* Acquire DMA channels */
729 while (!acquire_dma(sdd))
730 msleep(10);
731
732 spin_lock_irqsave(&sdd->lock, flags);
733
734 while (!list_empty(&sdd->queue)
735 && !(sdd->state & SUSPND)) {
736
737 struct spi_message *msg;
738
739 msg = container_of(sdd->queue.next, struct spi_message, queue);
740
741 list_del_init(&msg->queue);
742
743 /* Set Xfer busy flag */
744 sdd->state |= SPIBUSY;
745
746 spin_unlock_irqrestore(&sdd->lock, flags);
747
748 handle_msg(sdd, msg);
749
750 spin_lock_irqsave(&sdd->lock, flags);
751
752 sdd->state &= ~SPIBUSY;
753 }
754
755 spin_unlock_irqrestore(&sdd->lock, flags);
756
757 /* Free DMA channels */
758 s3c2410_dma_free(sdd->tx_dmach, &s3c64xx_spi_dma_client);
759 s3c2410_dma_free(sdd->rx_dmach, &s3c64xx_spi_dma_client);
760 }
761
762 static int s3c64xx_spi_transfer(struct spi_device *spi,
763 struct spi_message *msg)
764 {
765 struct s3c64xx_spi_driver_data *sdd;
766 unsigned long flags;
767
768 sdd = spi_master_get_devdata(spi->master);
769
770 spin_lock_irqsave(&sdd->lock, flags);
771
772 if (sdd->state & SUSPND) {
773 spin_unlock_irqrestore(&sdd->lock, flags);
774 return -ESHUTDOWN;
775 }
776
777 msg->status = -EINPROGRESS;
778 msg->actual_length = 0;
779
780 list_add_tail(&msg->queue, &sdd->queue);
781
782 queue_work(sdd->workqueue, &sdd->work);
783
784 spin_unlock_irqrestore(&sdd->lock, flags);
785
786 return 0;
787 }
788
789 /*
790 * Here we only check the validity of requested configuration
791 * and save the configuration in a local data-structure.
792 * The controller is actually configured only just before we
793 * get a message to transfer.
794 */
795 static int s3c64xx_spi_setup(struct spi_device *spi)
796 {
797 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
798 struct s3c64xx_spi_driver_data *sdd;
799 struct s3c64xx_spi_info *sci;
800 struct spi_message *msg;
801 u32 psr, speed;
802 unsigned long flags;
803 int err = 0;
804
805 if (cs == NULL || cs->set_level == NULL) {
806 dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select);
807 return -ENODEV;
808 }
809
810 sdd = spi_master_get_devdata(spi->master);
811 sci = sdd->cntrlr_info;
812
813 spin_lock_irqsave(&sdd->lock, flags);
814
815 list_for_each_entry(msg, &sdd->queue, queue) {
816 /* Is some mssg is already queued for this device */
817 if (msg->spi == spi) {
818 dev_err(&spi->dev,
819 "setup: attempt while mssg in queue!\n");
820 spin_unlock_irqrestore(&sdd->lock, flags);
821 return -EBUSY;
822 }
823 }
824
825 if (sdd->state & SUSPND) {
826 spin_unlock_irqrestore(&sdd->lock, flags);
827 dev_err(&spi->dev,
828 "setup: SPI-%d not active!\n", spi->master->bus_num);
829 return -ESHUTDOWN;
830 }
831
832 spin_unlock_irqrestore(&sdd->lock, flags);
833
834 if (spi->bits_per_word != 8
835 && spi->bits_per_word != 16
836 && spi->bits_per_word != 32) {
837 dev_err(&spi->dev, "setup: %dbits/wrd not supported!\n",
838 spi->bits_per_word);
839 err = -EINVAL;
840 goto setup_exit;
841 }
842
843 /* Check if we can provide the requested rate */
844 speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1); /* Max possible */
845
846 if (spi->max_speed_hz > speed)
847 spi->max_speed_hz = speed;
848
849 psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
850 psr &= S3C64XX_SPI_PSR_MASK;
851 if (psr == S3C64XX_SPI_PSR_MASK)
852 psr--;
853
854 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
855 if (spi->max_speed_hz < speed) {
856 if (psr+1 < S3C64XX_SPI_PSR_MASK) {
857 psr++;
858 } else {
859 err = -EINVAL;
860 goto setup_exit;
861 }
862 }
863
864 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
865 if (spi->max_speed_hz >= speed)
866 spi->max_speed_hz = speed;
867 else
868 err = -EINVAL;
869
870 setup_exit:
871
872 /* setup() returns with device de-selected */
873 disable_cs(sdd, spi);
874
875 return err;
876 }
877
878 static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
879 {
880 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
881 void __iomem *regs = sdd->regs;
882 unsigned int val;
883
884 sdd->cur_speed = 0;
885
886 S3C64XX_SPI_DEACT(sdd);
887
888 /* Disable Interrupts - we use Polling if not DMA mode */
889 writel(0, regs + S3C64XX_SPI_INT_EN);
890
891 writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
892 regs + S3C64XX_SPI_CLK_CFG);
893 writel(0, regs + S3C64XX_SPI_MODE_CFG);
894 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
895
896 /* Clear any irq pending bits */
897 writel(readl(regs + S3C64XX_SPI_PENDING_CLR),
898 regs + S3C64XX_SPI_PENDING_CLR);
899
900 writel(0, regs + S3C64XX_SPI_SWAP_CFG);
901
902 val = readl(regs + S3C64XX_SPI_MODE_CFG);
903 val &= ~S3C64XX_SPI_MODE_4BURST;
904 val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
905 val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
906 writel(val, regs + S3C64XX_SPI_MODE_CFG);
907
908 flush_fifo(sdd);
909 }
910
911 static int __init s3c64xx_spi_probe(struct platform_device *pdev)
912 {
913 struct resource *mem_res, *dmatx_res, *dmarx_res;
914 struct s3c64xx_spi_driver_data *sdd;
915 struct s3c64xx_spi_info *sci;
916 struct spi_master *master;
917 int ret;
918
919 if (pdev->id < 0) {
920 dev_err(&pdev->dev,
921 "Invalid platform device id-%d\n", pdev->id);
922 return -ENODEV;
923 }
924
925 if (pdev->dev.platform_data == NULL) {
926 dev_err(&pdev->dev, "platform_data missing!\n");
927 return -ENODEV;
928 }
929
930 sci = pdev->dev.platform_data;
931 if (!sci->src_clk_name) {
932 dev_err(&pdev->dev,
933 "Board init must call s3c64xx_spi_set_info()\n");
934 return -EINVAL;
935 }
936
937 /* Check for availability of necessary resource */
938
939 dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
940 if (dmatx_res == NULL) {
941 dev_err(&pdev->dev, "Unable to get SPI-Tx dma resource\n");
942 return -ENXIO;
943 }
944
945 dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
946 if (dmarx_res == NULL) {
947 dev_err(&pdev->dev, "Unable to get SPI-Rx dma resource\n");
948 return -ENXIO;
949 }
950
951 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
952 if (mem_res == NULL) {
953 dev_err(&pdev->dev, "Unable to get SPI MEM resource\n");
954 return -ENXIO;
955 }
956
957 master = spi_alloc_master(&pdev->dev,
958 sizeof(struct s3c64xx_spi_driver_data));
959 if (master == NULL) {
960 dev_err(&pdev->dev, "Unable to allocate SPI Master\n");
961 return -ENOMEM;
962 }
963
964 platform_set_drvdata(pdev, master);
965
966 sdd = spi_master_get_devdata(master);
967 sdd->master = master;
968 sdd->cntrlr_info = sci;
969 sdd->pdev = pdev;
970 sdd->sfr_start = mem_res->start;
971 sdd->tx_dmach = dmatx_res->start;
972 sdd->rx_dmach = dmarx_res->start;
973
974 sdd->cur_bpw = 8;
975
976 master->bus_num = pdev->id;
977 master->setup = s3c64xx_spi_setup;
978 master->transfer = s3c64xx_spi_transfer;
979 master->num_chipselect = sci->num_cs;
980 master->dma_alignment = 8;
981 /* the spi->mode bits understood by this driver: */
982 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
983
984 if (request_mem_region(mem_res->start,
985 resource_size(mem_res), pdev->name) == NULL) {
986 dev_err(&pdev->dev, "Req mem region failed\n");
987 ret = -ENXIO;
988 goto err0;
989 }
990
991 sdd->regs = ioremap(mem_res->start, resource_size(mem_res));
992 if (sdd->regs == NULL) {
993 dev_err(&pdev->dev, "Unable to remap IO\n");
994 ret = -ENXIO;
995 goto err1;
996 }
997
998 if (sci->cfg_gpio == NULL || sci->cfg_gpio(pdev)) {
999 dev_err(&pdev->dev, "Unable to config gpio\n");
1000 ret = -EBUSY;
1001 goto err2;
1002 }
1003
1004 /* Setup clocks */
1005 sdd->clk = clk_get(&pdev->dev, "spi");
1006 if (IS_ERR(sdd->clk)) {
1007 dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n");
1008 ret = PTR_ERR(sdd->clk);
1009 goto err3;
1010 }
1011
1012 if (clk_enable(sdd->clk)) {
1013 dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n");
1014 ret = -EBUSY;
1015 goto err4;
1016 }
1017
1018 sdd->src_clk = clk_get(&pdev->dev, sci->src_clk_name);
1019 if (IS_ERR(sdd->src_clk)) {
1020 dev_err(&pdev->dev,
1021 "Unable to acquire clock '%s'\n", sci->src_clk_name);
1022 ret = PTR_ERR(sdd->src_clk);
1023 goto err5;
1024 }
1025
1026 if (clk_enable(sdd->src_clk)) {
1027 dev_err(&pdev->dev, "Couldn't enable clock '%s'\n",
1028 sci->src_clk_name);
1029 ret = -EBUSY;
1030 goto err6;
1031 }
1032
1033 sdd->workqueue = create_singlethread_workqueue(
1034 dev_name(master->dev.parent));
1035 if (sdd->workqueue == NULL) {
1036 dev_err(&pdev->dev, "Unable to create workqueue\n");
1037 ret = -ENOMEM;
1038 goto err7;
1039 }
1040
1041 /* Setup Deufult Mode */
1042 s3c64xx_spi_hwinit(sdd, pdev->id);
1043
1044 spin_lock_init(&sdd->lock);
1045 init_completion(&sdd->xfer_completion);
1046 INIT_WORK(&sdd->work, s3c64xx_spi_work);
1047 INIT_LIST_HEAD(&sdd->queue);
1048
1049 if (spi_register_master(master)) {
1050 dev_err(&pdev->dev, "cannot register SPI master\n");
1051 ret = -EBUSY;
1052 goto err8;
1053 }
1054
1055 dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d "
1056 "with %d Slaves attached\n",
1057 pdev->id, master->num_chipselect);
1058 dev_dbg(&pdev->dev, "\tIOmem=[0x%x-0x%x]\tDMA=[Rx-%d, Tx-%d]\n",
1059 mem_res->end, mem_res->start,
1060 sdd->rx_dmach, sdd->tx_dmach);
1061
1062 return 0;
1063
1064 err8:
1065 destroy_workqueue(sdd->workqueue);
1066 err7:
1067 clk_disable(sdd->src_clk);
1068 err6:
1069 clk_put(sdd->src_clk);
1070 err5:
1071 clk_disable(sdd->clk);
1072 err4:
1073 clk_put(sdd->clk);
1074 err3:
1075 err2:
1076 iounmap((void *) sdd->regs);
1077 err1:
1078 release_mem_region(mem_res->start, resource_size(mem_res));
1079 err0:
1080 platform_set_drvdata(pdev, NULL);
1081 spi_master_put(master);
1082
1083 return ret;
1084 }
1085
1086 static int s3c64xx_spi_remove(struct platform_device *pdev)
1087 {
1088 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
1089 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1090 struct resource *mem_res;
1091 unsigned long flags;
1092
1093 spin_lock_irqsave(&sdd->lock, flags);
1094 sdd->state |= SUSPND;
1095 spin_unlock_irqrestore(&sdd->lock, flags);
1096
1097 while (sdd->state & SPIBUSY)
1098 msleep(10);
1099
1100 spi_unregister_master(master);
1101
1102 destroy_workqueue(sdd->workqueue);
1103
1104 clk_disable(sdd->src_clk);
1105 clk_put(sdd->src_clk);
1106
1107 clk_disable(sdd->clk);
1108 clk_put(sdd->clk);
1109
1110 iounmap((void *) sdd->regs);
1111
1112 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1113 if (mem_res != NULL)
1114 release_mem_region(mem_res->start, resource_size(mem_res));
1115
1116 platform_set_drvdata(pdev, NULL);
1117 spi_master_put(master);
1118
1119 return 0;
1120 }
1121
1122 #ifdef CONFIG_PM
1123 static int s3c64xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
1124 {
1125 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
1126 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1127 unsigned long flags;
1128
1129 spin_lock_irqsave(&sdd->lock, flags);
1130 sdd->state |= SUSPND;
1131 spin_unlock_irqrestore(&sdd->lock, flags);
1132
1133 while (sdd->state & SPIBUSY)
1134 msleep(10);
1135
1136 /* Disable the clock */
1137 clk_disable(sdd->src_clk);
1138 clk_disable(sdd->clk);
1139
1140 sdd->cur_speed = 0; /* Output Clock is stopped */
1141
1142 return 0;
1143 }
1144
1145 static int s3c64xx_spi_resume(struct platform_device *pdev)
1146 {
1147 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
1148 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1149 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
1150 unsigned long flags;
1151
1152 sci->cfg_gpio(pdev);
1153
1154 /* Enable the clock */
1155 clk_enable(sdd->src_clk);
1156 clk_enable(sdd->clk);
1157
1158 s3c64xx_spi_hwinit(sdd, pdev->id);
1159
1160 spin_lock_irqsave(&sdd->lock, flags);
1161 sdd->state &= ~SUSPND;
1162 spin_unlock_irqrestore(&sdd->lock, flags);
1163
1164 return 0;
1165 }
1166 #else
1167 #define s3c64xx_spi_suspend NULL
1168 #define s3c64xx_spi_resume NULL
1169 #endif /* CONFIG_PM */
1170
1171 static struct platform_driver s3c64xx_spi_driver = {
1172 .driver = {
1173 .name = "s3c64xx-spi",
1174 .owner = THIS_MODULE,
1175 },
1176 .remove = s3c64xx_spi_remove,
1177 .suspend = s3c64xx_spi_suspend,
1178 .resume = s3c64xx_spi_resume,
1179 };
1180 MODULE_ALIAS("platform:s3c64xx-spi");
1181
1182 static int __init s3c64xx_spi_init(void)
1183 {
1184 return platform_driver_probe(&s3c64xx_spi_driver, s3c64xx_spi_probe);
1185 }
1186 subsys_initcall(s3c64xx_spi_init);
1187
1188 static void __exit s3c64xx_spi_exit(void)
1189 {
1190 platform_driver_unregister(&s3c64xx_spi_driver);
1191 }
1192 module_exit(s3c64xx_spi_exit);
1193
1194 MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
1195 MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");
1196 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree