Commit | Line | Data |
---|---|---|
ca632f55 | 1 | /* |
230d42d4 JB |
2 | * Copyright (C) 2009 Samsung Electronics Ltd. |
3 | * Jaswinder Singh <jassi.brar@samsung.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/workqueue.h> | |
c2573128 | 23 | #include <linux/interrupt.h> |
230d42d4 JB |
24 | #include <linux/delay.h> |
25 | #include <linux/clk.h> | |
26 | #include <linux/dma-mapping.h> | |
78843727 | 27 | #include <linux/dmaengine.h> |
230d42d4 | 28 | #include <linux/platform_device.h> |
b97b6621 | 29 | #include <linux/pm_runtime.h> |
230d42d4 | 30 | #include <linux/spi/spi.h> |
1c20c200 | 31 | #include <linux/gpio.h> |
2b908075 TA |
32 | #include <linux/of.h> |
33 | #include <linux/of_gpio.h> | |
230d42d4 | 34 | |
436d42c6 | 35 | #include <linux/platform_data/spi-s3c64xx.h> |
230d42d4 | 36 | |
563b444e | 37 | #ifdef CONFIG_S3C_DMA |
78843727 AB |
38 | #include <mach/dma.h> |
39 | #endif | |
40 | ||
a5238e36 | 41 | #define MAX_SPI_PORTS 3 |
7e995556 | 42 | #define S3C64XX_SPI_QUIRK_POLL (1 << 0) |
a5238e36 | 43 | |
230d42d4 JB |
44 | /* Registers and bit-fields */ |
45 | ||
46 | #define S3C64XX_SPI_CH_CFG 0x00 | |
47 | #define S3C64XX_SPI_CLK_CFG 0x04 | |
48 | #define S3C64XX_SPI_MODE_CFG 0x08 | |
49 | #define S3C64XX_SPI_SLAVE_SEL 0x0C | |
50 | #define S3C64XX_SPI_INT_EN 0x10 | |
51 | #define S3C64XX_SPI_STATUS 0x14 | |
52 | #define S3C64XX_SPI_TX_DATA 0x18 | |
53 | #define S3C64XX_SPI_RX_DATA 0x1C | |
54 | #define S3C64XX_SPI_PACKET_CNT 0x20 | |
55 | #define S3C64XX_SPI_PENDING_CLR 0x24 | |
56 | #define S3C64XX_SPI_SWAP_CFG 0x28 | |
57 | #define S3C64XX_SPI_FB_CLK 0x2C | |
58 | ||
59 | #define S3C64XX_SPI_CH_HS_EN (1<<6) /* High Speed Enable */ | |
60 | #define S3C64XX_SPI_CH_SW_RST (1<<5) | |
61 | #define S3C64XX_SPI_CH_SLAVE (1<<4) | |
62 | #define S3C64XX_SPI_CPOL_L (1<<3) | |
63 | #define S3C64XX_SPI_CPHA_B (1<<2) | |
64 | #define S3C64XX_SPI_CH_RXCH_ON (1<<1) | |
65 | #define S3C64XX_SPI_CH_TXCH_ON (1<<0) | |
66 | ||
67 | #define S3C64XX_SPI_CLKSEL_SRCMSK (3<<9) | |
68 | #define S3C64XX_SPI_CLKSEL_SRCSHFT 9 | |
69 | #define S3C64XX_SPI_ENCLK_ENABLE (1<<8) | |
75bf3361 | 70 | #define S3C64XX_SPI_PSR_MASK 0xff |
230d42d4 JB |
71 | |
72 | #define S3C64XX_SPI_MODE_CH_TSZ_BYTE (0<<29) | |
73 | #define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD (1<<29) | |
74 | #define S3C64XX_SPI_MODE_CH_TSZ_WORD (2<<29) | |
75 | #define S3C64XX_SPI_MODE_CH_TSZ_MASK (3<<29) | |
76 | #define S3C64XX_SPI_MODE_BUS_TSZ_BYTE (0<<17) | |
77 | #define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17) | |
78 | #define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17) | |
79 | #define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17) | |
80 | #define S3C64XX_SPI_MODE_RXDMA_ON (1<<2) | |
81 | #define S3C64XX_SPI_MODE_TXDMA_ON (1<<1) | |
82 | #define S3C64XX_SPI_MODE_4BURST (1<<0) | |
83 | ||
84 | #define S3C64XX_SPI_SLAVE_AUTO (1<<1) | |
85 | #define S3C64XX_SPI_SLAVE_SIG_INACT (1<<0) | |
86 | ||
230d42d4 JB |
87 | #define S3C64XX_SPI_INT_TRAILING_EN (1<<6) |
88 | #define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5) | |
89 | #define S3C64XX_SPI_INT_RX_UNDERRUN_EN (1<<4) | |
90 | #define S3C64XX_SPI_INT_TX_OVERRUN_EN (1<<3) | |
91 | #define S3C64XX_SPI_INT_TX_UNDERRUN_EN (1<<2) | |
92 | #define S3C64XX_SPI_INT_RX_FIFORDY_EN (1<<1) | |
93 | #define S3C64XX_SPI_INT_TX_FIFORDY_EN (1<<0) | |
94 | ||
95 | #define S3C64XX_SPI_ST_RX_OVERRUN_ERR (1<<5) | |
96 | #define S3C64XX_SPI_ST_RX_UNDERRUN_ERR (1<<4) | |
97 | #define S3C64XX_SPI_ST_TX_OVERRUN_ERR (1<<3) | |
98 | #define S3C64XX_SPI_ST_TX_UNDERRUN_ERR (1<<2) | |
99 | #define S3C64XX_SPI_ST_RX_FIFORDY (1<<1) | |
100 | #define S3C64XX_SPI_ST_TX_FIFORDY (1<<0) | |
101 | ||
102 | #define S3C64XX_SPI_PACKET_CNT_EN (1<<16) | |
103 | ||
104 | #define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4) | |
105 | #define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3) | |
106 | #define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2) | |
107 | #define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1) | |
108 | #define S3C64XX_SPI_PND_TRAILING_CLR (1<<0) | |
109 | ||
110 | #define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7) | |
111 | #define S3C64XX_SPI_SWAP_RX_BYTE (1<<6) | |
112 | #define S3C64XX_SPI_SWAP_RX_BIT (1<<5) | |
113 | #define S3C64XX_SPI_SWAP_RX_EN (1<<4) | |
114 | #define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3) | |
115 | #define S3C64XX_SPI_SWAP_TX_BYTE (1<<2) | |
116 | #define S3C64XX_SPI_SWAP_TX_BIT (1<<1) | |
117 | #define S3C64XX_SPI_SWAP_TX_EN (1<<0) | |
118 | ||
119 | #define S3C64XX_SPI_FBCLK_MSK (3<<0) | |
120 | ||
a5238e36 TA |
121 | #define FIFO_LVL_MASK(i) ((i)->port_conf->fifo_lvl_mask[i->port_id]) |
122 | #define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & \ | |
123 | (1 << (i)->port_conf->tx_st_done)) ? 1 : 0) | |
124 | #define TX_FIFO_LVL(v, i) (((v) >> 6) & FIFO_LVL_MASK(i)) | |
125 | #define RX_FIFO_LVL(v, i) (((v) >> (i)->port_conf->rx_lvl_offset) & \ | |
126 | FIFO_LVL_MASK(i)) | |
230d42d4 JB |
127 | |
128 | #define S3C64XX_SPI_MAX_TRAILCNT 0x3ff | |
129 | #define S3C64XX_SPI_TRAILCNT_OFF 19 | |
130 | ||
131 | #define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT | |
132 | ||
133 | #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) | |
7e995556 | 134 | #define is_polling(x) (x->port_conf->quirks & S3C64XX_SPI_QUIRK_POLL) |
230d42d4 | 135 | |
230d42d4 JB |
136 | #define RXBUSY (1<<2) |
137 | #define TXBUSY (1<<3) | |
138 | ||
82ab8cd7 | 139 | struct s3c64xx_spi_dma_data { |
78843727 | 140 | struct dma_chan *ch; |
c10356b9 | 141 | enum dma_transfer_direction direction; |
78843727 | 142 | unsigned int dmach; |
82ab8cd7 BK |
143 | }; |
144 | ||
a5238e36 TA |
145 | /** |
146 | * struct s3c64xx_spi_info - SPI Controller hardware info | |
147 | * @fifo_lvl_mask: Bit-mask for {TX|RX}_FIFO_LVL bits in SPI_STATUS register. | |
148 | * @rx_lvl_offset: Bit offset of RX_FIFO_LVL bits in SPI_STATUS regiter. | |
149 | * @tx_st_done: Bit offset of TX_DONE bit in SPI_STATUS regiter. | |
150 | * @high_speed: True, if the controller supports HIGH_SPEED_EN bit. | |
151 | * @clk_from_cmu: True, if the controller does not include a clock mux and | |
152 | * prescaler unit. | |
153 | * | |
154 | * The Samsung s3c64xx SPI controller are used on various Samsung SoC's but | |
155 | * differ in some aspects such as the size of the fifo and spi bus clock | |
156 | * setup. Such differences are specified to the driver using this structure | |
157 | * which is provided as driver data to the driver. | |
158 | */ | |
159 | struct s3c64xx_spi_port_config { | |
160 | int fifo_lvl_mask[MAX_SPI_PORTS]; | |
161 | int rx_lvl_offset; | |
162 | int tx_st_done; | |
7e995556 | 163 | int quirks; |
a5238e36 TA |
164 | bool high_speed; |
165 | bool clk_from_cmu; | |
166 | }; | |
167 | ||
230d42d4 JB |
168 | /** |
169 | * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver. | |
170 | * @clk: Pointer to the spi clock. | |
b0d5d6e5 | 171 | * @src_clk: Pointer to the clock used to generate SPI signals. |
230d42d4 | 172 | * @master: Pointer to the SPI Protocol master. |
230d42d4 JB |
173 | * @cntrlr_info: Platform specific data for the controller this driver manages. |
174 | * @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint. | |
230d42d4 JB |
175 | * @lock: Controller specific lock. |
176 | * @state: Set of FLAGS to indicate status. | |
177 | * @rx_dmach: Controller's DMA channel for Rx. | |
178 | * @tx_dmach: Controller's DMA channel for Tx. | |
179 | * @sfr_start: BUS address of SPI controller regs. | |
180 | * @regs: Pointer to ioremap'ed controller registers. | |
c2573128 | 181 | * @irq: interrupt |
230d42d4 JB |
182 | * @xfer_completion: To indicate completion of xfer task. |
183 | * @cur_mode: Stores the active configuration of the controller. | |
184 | * @cur_bpw: Stores the active bits per word settings. | |
185 | * @cur_speed: Stores the active xfer clock speed. | |
186 | */ | |
187 | struct s3c64xx_spi_driver_data { | |
188 | void __iomem *regs; | |
189 | struct clk *clk; | |
b0d5d6e5 | 190 | struct clk *src_clk; |
230d42d4 JB |
191 | struct platform_device *pdev; |
192 | struct spi_master *master; | |
ad7de729 | 193 | struct s3c64xx_spi_info *cntrlr_info; |
230d42d4 | 194 | struct spi_device *tgl_spi; |
230d42d4 | 195 | spinlock_t lock; |
230d42d4 JB |
196 | unsigned long sfr_start; |
197 | struct completion xfer_completion; | |
198 | unsigned state; | |
199 | unsigned cur_mode, cur_bpw; | |
200 | unsigned cur_speed; | |
82ab8cd7 BK |
201 | struct s3c64xx_spi_dma_data rx_dma; |
202 | struct s3c64xx_spi_dma_data tx_dma; | |
563b444e | 203 | #ifdef CONFIG_S3C_DMA |
39d3e807 | 204 | struct samsung_dma_ops *ops; |
78843727 | 205 | #endif |
a5238e36 TA |
206 | struct s3c64xx_spi_port_config *port_conf; |
207 | unsigned int port_id; | |
2b908075 | 208 | unsigned long gpios[4]; |
3146beec | 209 | bool cs_gpio; |
230d42d4 JB |
210 | }; |
211 | ||
230d42d4 JB |
212 | static void flush_fifo(struct s3c64xx_spi_driver_data *sdd) |
213 | { | |
230d42d4 JB |
214 | void __iomem *regs = sdd->regs; |
215 | unsigned long loops; | |
216 | u32 val; | |
217 | ||
218 | writel(0, regs + S3C64XX_SPI_PACKET_CNT); | |
219 | ||
7d859ff4 KK |
220 | val = readl(regs + S3C64XX_SPI_CH_CFG); |
221 | val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON); | |
222 | writel(val, regs + S3C64XX_SPI_CH_CFG); | |
223 | ||
230d42d4 JB |
224 | val = readl(regs + S3C64XX_SPI_CH_CFG); |
225 | val |= S3C64XX_SPI_CH_SW_RST; | |
226 | val &= ~S3C64XX_SPI_CH_HS_EN; | |
227 | writel(val, regs + S3C64XX_SPI_CH_CFG); | |
228 | ||
229 | /* Flush TxFIFO*/ | |
230 | loops = msecs_to_loops(1); | |
231 | do { | |
232 | val = readl(regs + S3C64XX_SPI_STATUS); | |
a5238e36 | 233 | } while (TX_FIFO_LVL(val, sdd) && loops--); |
230d42d4 | 234 | |
be7852a8 MB |
235 | if (loops == 0) |
236 | dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n"); | |
237 | ||
230d42d4 JB |
238 | /* Flush RxFIFO*/ |
239 | loops = msecs_to_loops(1); | |
240 | do { | |
241 | val = readl(regs + S3C64XX_SPI_STATUS); | |
a5238e36 | 242 | if (RX_FIFO_LVL(val, sdd)) |
230d42d4 JB |
243 | readl(regs + S3C64XX_SPI_RX_DATA); |
244 | else | |
245 | break; | |
246 | } while (loops--); | |
247 | ||
be7852a8 MB |
248 | if (loops == 0) |
249 | dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n"); | |
250 | ||
230d42d4 JB |
251 | val = readl(regs + S3C64XX_SPI_CH_CFG); |
252 | val &= ~S3C64XX_SPI_CH_SW_RST; | |
253 | writel(val, regs + S3C64XX_SPI_CH_CFG); | |
254 | ||
255 | val = readl(regs + S3C64XX_SPI_MODE_CFG); | |
256 | val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON); | |
257 | writel(val, regs + S3C64XX_SPI_MODE_CFG); | |
230d42d4 JB |
258 | } |
259 | ||
82ab8cd7 | 260 | static void s3c64xx_spi_dmacb(void *data) |
39d3e807 | 261 | { |
82ab8cd7 BK |
262 | struct s3c64xx_spi_driver_data *sdd; |
263 | struct s3c64xx_spi_dma_data *dma = data; | |
39d3e807 BK |
264 | unsigned long flags; |
265 | ||
054ebcc4 | 266 | if (dma->direction == DMA_DEV_TO_MEM) |
82ab8cd7 BK |
267 | sdd = container_of(data, |
268 | struct s3c64xx_spi_driver_data, rx_dma); | |
269 | else | |
270 | sdd = container_of(data, | |
271 | struct s3c64xx_spi_driver_data, tx_dma); | |
272 | ||
39d3e807 BK |
273 | spin_lock_irqsave(&sdd->lock, flags); |
274 | ||
054ebcc4 | 275 | if (dma->direction == DMA_DEV_TO_MEM) { |
82ab8cd7 BK |
276 | sdd->state &= ~RXBUSY; |
277 | if (!(sdd->state & TXBUSY)) | |
278 | complete(&sdd->xfer_completion); | |
279 | } else { | |
280 | sdd->state &= ~TXBUSY; | |
281 | if (!(sdd->state & RXBUSY)) | |
282 | complete(&sdd->xfer_completion); | |
283 | } | |
39d3e807 BK |
284 | |
285 | spin_unlock_irqrestore(&sdd->lock, flags); | |
286 | } | |
287 | ||
563b444e | 288 | #ifdef CONFIG_S3C_DMA |
78843727 AB |
289 | /* FIXME: remove this section once arch/arm/mach-s3c64xx uses dmaengine */ |
290 | ||
291 | static struct s3c2410_dma_client s3c64xx_spi_dma_client = { | |
292 | .name = "samsung-spi-dma", | |
293 | }; | |
294 | ||
82ab8cd7 BK |
295 | static void prepare_dma(struct s3c64xx_spi_dma_data *dma, |
296 | unsigned len, dma_addr_t buf) | |
39d3e807 | 297 | { |
82ab8cd7 | 298 | struct s3c64xx_spi_driver_data *sdd; |
4969c32b BK |
299 | struct samsung_dma_prep info; |
300 | struct samsung_dma_config config; | |
39d3e807 | 301 | |
4969c32b | 302 | if (dma->direction == DMA_DEV_TO_MEM) { |
82ab8cd7 BK |
303 | sdd = container_of((void *)dma, |
304 | struct s3c64xx_spi_driver_data, rx_dma); | |
4969c32b BK |
305 | config.direction = sdd->rx_dma.direction; |
306 | config.fifo = sdd->sfr_start + S3C64XX_SPI_RX_DATA; | |
307 | config.width = sdd->cur_bpw / 8; | |
78843727 | 308 | sdd->ops->config((enum dma_ch)sdd->rx_dma.ch, &config); |
4969c32b | 309 | } else { |
82ab8cd7 BK |
310 | sdd = container_of((void *)dma, |
311 | struct s3c64xx_spi_driver_data, tx_dma); | |
4969c32b BK |
312 | config.direction = sdd->tx_dma.direction; |
313 | config.fifo = sdd->sfr_start + S3C64XX_SPI_TX_DATA; | |
314 | config.width = sdd->cur_bpw / 8; | |
78843727 | 315 | sdd->ops->config((enum dma_ch)sdd->tx_dma.ch, &config); |
4969c32b | 316 | } |
39d3e807 | 317 | |
82ab8cd7 BK |
318 | info.cap = DMA_SLAVE; |
319 | info.len = len; | |
320 | info.fp = s3c64xx_spi_dmacb; | |
321 | info.fp_param = dma; | |
322 | info.direction = dma->direction; | |
323 | info.buf = buf; | |
324 | ||
78843727 AB |
325 | sdd->ops->prepare((enum dma_ch)dma->ch, &info); |
326 | sdd->ops->trigger((enum dma_ch)dma->ch); | |
82ab8cd7 | 327 | } |
39d3e807 | 328 | |
82ab8cd7 BK |
329 | static int acquire_dma(struct s3c64xx_spi_driver_data *sdd) |
330 | { | |
4969c32b | 331 | struct samsung_dma_req req; |
b5be04d3 | 332 | struct device *dev = &sdd->pdev->dev; |
82ab8cd7 BK |
333 | |
334 | sdd->ops = samsung_dma_get_ops(); | |
335 | ||
4969c32b BK |
336 | req.cap = DMA_SLAVE; |
337 | req.client = &s3c64xx_spi_dma_client; | |
338 | ||
b998aca8 JH |
339 | sdd->rx_dma.ch = (struct dma_chan *)(unsigned long)sdd->ops->request( |
340 | sdd->rx_dma.dmach, &req, dev, "rx"); | |
341 | sdd->tx_dma.ch = (struct dma_chan *)(unsigned long)sdd->ops->request( | |
342 | sdd->tx_dma.dmach, &req, dev, "tx"); | |
82ab8cd7 BK |
343 | |
344 | return 1; | |
39d3e807 BK |
345 | } |
346 | ||
78843727 AB |
347 | static int s3c64xx_spi_prepare_transfer(struct spi_master *spi) |
348 | { | |
349 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); | |
350 | ||
7e995556 G |
351 | /* |
352 | * If DMA resource was not available during | |
353 | * probe, no need to continue with dma requests | |
354 | * else Acquire DMA channels | |
355 | */ | |
356 | while (!is_polling(sdd) && !acquire_dma(sdd)) | |
78843727 AB |
357 | usleep_range(10000, 11000); |
358 | ||
359 | pm_runtime_get_sync(&sdd->pdev->dev); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi) | |
365 | { | |
366 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); | |
367 | ||
368 | /* Free DMA channels */ | |
7e995556 G |
369 | if (!is_polling(sdd)) { |
370 | sdd->ops->release((enum dma_ch)sdd->rx_dma.ch, | |
371 | &s3c64xx_spi_dma_client); | |
372 | sdd->ops->release((enum dma_ch)sdd->tx_dma.ch, | |
373 | &s3c64xx_spi_dma_client); | |
374 | } | |
78843727 AB |
375 | pm_runtime_put(&sdd->pdev->dev); |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static void s3c64xx_spi_dma_stop(struct s3c64xx_spi_driver_data *sdd, | |
381 | struct s3c64xx_spi_dma_data *dma) | |
382 | { | |
383 | sdd->ops->stop((enum dma_ch)dma->ch); | |
384 | } | |
385 | #else | |
386 | ||
387 | static void prepare_dma(struct s3c64xx_spi_dma_data *dma, | |
388 | unsigned len, dma_addr_t buf) | |
389 | { | |
390 | struct s3c64xx_spi_driver_data *sdd; | |
391 | struct dma_slave_config config; | |
78843727 AB |
392 | struct dma_async_tx_descriptor *desc; |
393 | ||
b1a8e78d TF |
394 | memset(&config, 0, sizeof(config)); |
395 | ||
78843727 AB |
396 | if (dma->direction == DMA_DEV_TO_MEM) { |
397 | sdd = container_of((void *)dma, | |
398 | struct s3c64xx_spi_driver_data, rx_dma); | |
399 | config.direction = dma->direction; | |
400 | config.src_addr = sdd->sfr_start + S3C64XX_SPI_RX_DATA; | |
401 | config.src_addr_width = sdd->cur_bpw / 8; | |
402 | config.src_maxburst = 1; | |
403 | dmaengine_slave_config(dma->ch, &config); | |
404 | } else { | |
405 | sdd = container_of((void *)dma, | |
406 | struct s3c64xx_spi_driver_data, tx_dma); | |
407 | config.direction = dma->direction; | |
408 | config.dst_addr = sdd->sfr_start + S3C64XX_SPI_TX_DATA; | |
409 | config.dst_addr_width = sdd->cur_bpw / 8; | |
410 | config.dst_maxburst = 1; | |
411 | dmaengine_slave_config(dma->ch, &config); | |
412 | } | |
413 | ||
90438c4b TF |
414 | desc = dmaengine_prep_slave_single(dma->ch, buf, len, |
415 | dma->direction, DMA_PREP_INTERRUPT); | |
78843727 AB |
416 | |
417 | desc->callback = s3c64xx_spi_dmacb; | |
418 | desc->callback_param = dma; | |
419 | ||
420 | dmaengine_submit(desc); | |
421 | dma_async_issue_pending(dma->ch); | |
422 | } | |
423 | ||
424 | static int s3c64xx_spi_prepare_transfer(struct spi_master *spi) | |
425 | { | |
426 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); | |
427 | dma_filter_fn filter = sdd->cntrlr_info->filter; | |
428 | struct device *dev = &sdd->pdev->dev; | |
429 | dma_cap_mask_t mask; | |
fb9d044e | 430 | int ret; |
78843727 | 431 | |
9f4b3238 G |
432 | if (is_polling(sdd)) |
433 | return 0; | |
434 | ||
78843727 AB |
435 | dma_cap_zero(mask); |
436 | dma_cap_set(DMA_SLAVE, mask); | |
437 | ||
438 | /* Acquire DMA channels */ | |
439 | sdd->rx_dma.ch = dma_request_slave_channel_compat(mask, filter, | |
db0606ec | 440 | (void *)sdd->rx_dma.dmach, dev, "rx"); |
fb9d044e MB |
441 | if (!sdd->rx_dma.ch) { |
442 | dev_err(dev, "Failed to get RX DMA channel\n"); | |
443 | ret = -EBUSY; | |
444 | goto out; | |
445 | } | |
446 | ||
78843727 | 447 | sdd->tx_dma.ch = dma_request_slave_channel_compat(mask, filter, |
db0606ec | 448 | (void *)sdd->tx_dma.dmach, dev, "tx"); |
fb9d044e MB |
449 | if (!sdd->tx_dma.ch) { |
450 | dev_err(dev, "Failed to get TX DMA channel\n"); | |
451 | ret = -EBUSY; | |
452 | goto out_rx; | |
453 | } | |
454 | ||
455 | ret = pm_runtime_get_sync(&sdd->pdev->dev); | |
6c6cf64b | 456 | if (ret < 0) { |
fb9d044e MB |
457 | dev_err(dev, "Failed to enable device: %d\n", ret); |
458 | goto out_tx; | |
459 | } | |
78843727 AB |
460 | |
461 | return 0; | |
fb9d044e MB |
462 | |
463 | out_tx: | |
464 | dma_release_channel(sdd->tx_dma.ch); | |
465 | out_rx: | |
466 | dma_release_channel(sdd->rx_dma.ch); | |
467 | out: | |
468 | return ret; | |
78843727 AB |
469 | } |
470 | ||
471 | static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi) | |
472 | { | |
473 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); | |
474 | ||
475 | /* Free DMA channels */ | |
7e995556 G |
476 | if (!is_polling(sdd)) { |
477 | dma_release_channel(sdd->rx_dma.ch); | |
478 | dma_release_channel(sdd->tx_dma.ch); | |
479 | } | |
78843727 AB |
480 | |
481 | pm_runtime_put(&sdd->pdev->dev); | |
482 | return 0; | |
483 | } | |
484 | ||
485 | static void s3c64xx_spi_dma_stop(struct s3c64xx_spi_driver_data *sdd, | |
486 | struct s3c64xx_spi_dma_data *dma) | |
487 | { | |
488 | dmaengine_terminate_all(dma->ch); | |
489 | } | |
490 | #endif | |
491 | ||
230d42d4 JB |
492 | static void enable_datapath(struct s3c64xx_spi_driver_data *sdd, |
493 | struct spi_device *spi, | |
494 | struct spi_transfer *xfer, int dma_mode) | |
495 | { | |
230d42d4 JB |
496 | void __iomem *regs = sdd->regs; |
497 | u32 modecfg, chcfg; | |
498 | ||
499 | modecfg = readl(regs + S3C64XX_SPI_MODE_CFG); | |
500 | modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON); | |
501 | ||
502 | chcfg = readl(regs + S3C64XX_SPI_CH_CFG); | |
503 | chcfg &= ~S3C64XX_SPI_CH_TXCH_ON; | |
504 | ||
505 | if (dma_mode) { | |
506 | chcfg &= ~S3C64XX_SPI_CH_RXCH_ON; | |
507 | } else { | |
508 | /* Always shift in data in FIFO, even if xfer is Tx only, | |
509 | * this helps setting PCKT_CNT value for generating clocks | |
510 | * as exactly needed. | |
511 | */ | |
512 | chcfg |= S3C64XX_SPI_CH_RXCH_ON; | |
513 | writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff) | |
514 | | S3C64XX_SPI_PACKET_CNT_EN, | |
515 | regs + S3C64XX_SPI_PACKET_CNT); | |
516 | } | |
517 | ||
518 | if (xfer->tx_buf != NULL) { | |
519 | sdd->state |= TXBUSY; | |
520 | chcfg |= S3C64XX_SPI_CH_TXCH_ON; | |
521 | if (dma_mode) { | |
522 | modecfg |= S3C64XX_SPI_MODE_TXDMA_ON; | |
82ab8cd7 | 523 | prepare_dma(&sdd->tx_dma, xfer->len, xfer->tx_dma); |
230d42d4 | 524 | } else { |
0c92ecf1 JB |
525 | switch (sdd->cur_bpw) { |
526 | case 32: | |
527 | iowrite32_rep(regs + S3C64XX_SPI_TX_DATA, | |
528 | xfer->tx_buf, xfer->len / 4); | |
529 | break; | |
530 | case 16: | |
531 | iowrite16_rep(regs + S3C64XX_SPI_TX_DATA, | |
532 | xfer->tx_buf, xfer->len / 2); | |
533 | break; | |
534 | default: | |
535 | iowrite8_rep(regs + S3C64XX_SPI_TX_DATA, | |
536 | xfer->tx_buf, xfer->len); | |
537 | break; | |
538 | } | |
230d42d4 JB |
539 | } |
540 | } | |
541 | ||
542 | if (xfer->rx_buf != NULL) { | |
543 | sdd->state |= RXBUSY; | |
544 | ||
a5238e36 | 545 | if (sdd->port_conf->high_speed && sdd->cur_speed >= 30000000UL |
230d42d4 JB |
546 | && !(sdd->cur_mode & SPI_CPHA)) |
547 | chcfg |= S3C64XX_SPI_CH_HS_EN; | |
548 | ||
549 | if (dma_mode) { | |
550 | modecfg |= S3C64XX_SPI_MODE_RXDMA_ON; | |
551 | chcfg |= S3C64XX_SPI_CH_RXCH_ON; | |
552 | writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff) | |
553 | | S3C64XX_SPI_PACKET_CNT_EN, | |
554 | regs + S3C64XX_SPI_PACKET_CNT); | |
82ab8cd7 | 555 | prepare_dma(&sdd->rx_dma, xfer->len, xfer->rx_dma); |
230d42d4 JB |
556 | } |
557 | } | |
558 | ||
559 | writel(modecfg, regs + S3C64XX_SPI_MODE_CFG); | |
560 | writel(chcfg, regs + S3C64XX_SPI_CH_CFG); | |
561 | } | |
562 | ||
563 | static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd, | |
564 | struct spi_device *spi) | |
565 | { | |
566 | struct s3c64xx_spi_csinfo *cs; | |
567 | ||
568 | if (sdd->tgl_spi != NULL) { /* If last device toggled after mssg */ | |
569 | if (sdd->tgl_spi != spi) { /* if last mssg on diff device */ | |
570 | /* Deselect the last toggled device */ | |
571 | cs = sdd->tgl_spi->controller_data; | |
3146beec G |
572 | if (sdd->cs_gpio) |
573 | gpio_set_value(cs->line, | |
574 | spi->mode & SPI_CS_HIGH ? 0 : 1); | |
230d42d4 JB |
575 | } |
576 | sdd->tgl_spi = NULL; | |
577 | } | |
578 | ||
579 | cs = spi->controller_data; | |
3146beec G |
580 | if (sdd->cs_gpio) |
581 | gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0); | |
7e995556 G |
582 | |
583 | /* Start the signals */ | |
584 | writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL); | |
585 | } | |
586 | ||
79617073 | 587 | static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd, |
7e995556 G |
588 | int timeout_ms) |
589 | { | |
590 | void __iomem *regs = sdd->regs; | |
591 | unsigned long val = 1; | |
592 | u32 status; | |
593 | ||
594 | /* max fifo depth available */ | |
595 | u32 max_fifo = (FIFO_LVL_MASK(sdd) >> 1) + 1; | |
596 | ||
597 | if (timeout_ms) | |
598 | val = msecs_to_loops(timeout_ms); | |
599 | ||
600 | do { | |
601 | status = readl(regs + S3C64XX_SPI_STATUS); | |
602 | } while (RX_FIFO_LVL(status, sdd) < max_fifo && --val); | |
603 | ||
604 | /* return the actual received data length */ | |
605 | return RX_FIFO_LVL(status, sdd); | |
230d42d4 JB |
606 | } |
607 | ||
608 | static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd, | |
609 | struct spi_transfer *xfer, int dma_mode) | |
610 | { | |
230d42d4 JB |
611 | void __iomem *regs = sdd->regs; |
612 | unsigned long val; | |
613 | int ms; | |
614 | ||
615 | /* millisecs to xfer 'len' bytes @ 'cur_speed' */ | |
616 | ms = xfer->len * 8 * 1000 / sdd->cur_speed; | |
9d8f86b5 | 617 | ms += 10; /* some tolerance */ |
230d42d4 JB |
618 | |
619 | if (dma_mode) { | |
620 | val = msecs_to_jiffies(ms) + 10; | |
621 | val = wait_for_completion_timeout(&sdd->xfer_completion, val); | |
622 | } else { | |
c3f139b6 | 623 | u32 status; |
230d42d4 JB |
624 | val = msecs_to_loops(ms); |
625 | do { | |
c3f139b6 | 626 | status = readl(regs + S3C64XX_SPI_STATUS); |
a5238e36 | 627 | } while (RX_FIFO_LVL(status, sdd) < xfer->len && --val); |
230d42d4 JB |
628 | } |
629 | ||
230d42d4 JB |
630 | if (dma_mode) { |
631 | u32 status; | |
632 | ||
633 | /* | |
7e995556 G |
634 | * If the previous xfer was completed within timeout, then |
635 | * proceed further else return -EIO. | |
230d42d4 JB |
636 | * DmaTx returns after simply writing data in the FIFO, |
637 | * w/o waiting for real transmission on the bus to finish. | |
638 | * DmaRx returns only after Dma read data from FIFO which | |
639 | * needs bus transmission to finish, so we don't worry if | |
640 | * Xfer involved Rx(with or without Tx). | |
641 | */ | |
7e995556 | 642 | if (val && !xfer->rx_buf) { |
230d42d4 JB |
643 | val = msecs_to_loops(10); |
644 | status = readl(regs + S3C64XX_SPI_STATUS); | |
a5238e36 TA |
645 | while ((TX_FIFO_LVL(status, sdd) |
646 | || !S3C64XX_SPI_ST_TX_DONE(status, sdd)) | |
230d42d4 JB |
647 | && --val) { |
648 | cpu_relax(); | |
649 | status = readl(regs + S3C64XX_SPI_STATUS); | |
650 | } | |
651 | ||
230d42d4 | 652 | } |
7e995556 G |
653 | |
654 | /* If timed out while checking rx/tx status return error */ | |
655 | if (!val) | |
656 | return -EIO; | |
230d42d4 | 657 | } else { |
7e995556 G |
658 | int loops; |
659 | u32 cpy_len; | |
660 | u8 *buf; | |
661 | ||
230d42d4 | 662 | /* If it was only Tx */ |
7e995556 | 663 | if (!xfer->rx_buf) { |
230d42d4 JB |
664 | sdd->state &= ~TXBUSY; |
665 | return 0; | |
666 | } | |
667 | ||
7e995556 G |
668 | /* |
669 | * If the receive length is bigger than the controller fifo | |
670 | * size, calculate the loops and read the fifo as many times. | |
671 | * loops = length / max fifo size (calculated by using the | |
672 | * fifo mask). | |
673 | * For any size less than the fifo size the below code is | |
674 | * executed atleast once. | |
675 | */ | |
676 | loops = xfer->len / ((FIFO_LVL_MASK(sdd) >> 1) + 1); | |
677 | buf = xfer->rx_buf; | |
678 | do { | |
679 | /* wait for data to be received in the fifo */ | |
79617073 MB |
680 | cpy_len = s3c64xx_spi_wait_for_timeout(sdd, |
681 | (loops ? ms : 0)); | |
7e995556 G |
682 | |
683 | switch (sdd->cur_bpw) { | |
684 | case 32: | |
685 | ioread32_rep(regs + S3C64XX_SPI_RX_DATA, | |
686 | buf, cpy_len / 4); | |
687 | break; | |
688 | case 16: | |
689 | ioread16_rep(regs + S3C64XX_SPI_RX_DATA, | |
690 | buf, cpy_len / 2); | |
691 | break; | |
692 | default: | |
693 | ioread8_rep(regs + S3C64XX_SPI_RX_DATA, | |
694 | buf, cpy_len); | |
695 | break; | |
696 | } | |
697 | ||
698 | buf = buf + cpy_len; | |
699 | } while (loops--); | |
230d42d4 JB |
700 | sdd->state &= ~RXBUSY; |
701 | } | |
702 | ||
703 | return 0; | |
704 | } | |
705 | ||
706 | static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd, | |
707 | struct spi_device *spi) | |
708 | { | |
709 | struct s3c64xx_spi_csinfo *cs = spi->controller_data; | |
710 | ||
711 | if (sdd->tgl_spi == spi) | |
712 | sdd->tgl_spi = NULL; | |
713 | ||
3146beec G |
714 | if (sdd->cs_gpio) |
715 | gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1); | |
7e995556 G |
716 | |
717 | /* Quiese the signals */ | |
718 | writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL); | |
230d42d4 JB |
719 | } |
720 | ||
721 | static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd) | |
722 | { | |
230d42d4 JB |
723 | void __iomem *regs = sdd->regs; |
724 | u32 val; | |
725 | ||
726 | /* Disable Clock */ | |
a5238e36 | 727 | if (sdd->port_conf->clk_from_cmu) { |
9f667bff | 728 | clk_disable_unprepare(sdd->src_clk); |
b42a81ca JB |
729 | } else { |
730 | val = readl(regs + S3C64XX_SPI_CLK_CFG); | |
731 | val &= ~S3C64XX_SPI_ENCLK_ENABLE; | |
732 | writel(val, regs + S3C64XX_SPI_CLK_CFG); | |
733 | } | |
230d42d4 JB |
734 | |
735 | /* Set Polarity and Phase */ | |
736 | val = readl(regs + S3C64XX_SPI_CH_CFG); | |
737 | val &= ~(S3C64XX_SPI_CH_SLAVE | | |
738 | S3C64XX_SPI_CPOL_L | | |
739 | S3C64XX_SPI_CPHA_B); | |
740 | ||
741 | if (sdd->cur_mode & SPI_CPOL) | |
742 | val |= S3C64XX_SPI_CPOL_L; | |
743 | ||
744 | if (sdd->cur_mode & SPI_CPHA) | |
745 | val |= S3C64XX_SPI_CPHA_B; | |
746 | ||
747 | writel(val, regs + S3C64XX_SPI_CH_CFG); | |
748 | ||
749 | /* Set Channel & DMA Mode */ | |
750 | val = readl(regs + S3C64XX_SPI_MODE_CFG); | |
751 | val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK | |
752 | | S3C64XX_SPI_MODE_CH_TSZ_MASK); | |
753 | ||
754 | switch (sdd->cur_bpw) { | |
755 | case 32: | |
756 | val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD; | |
0c92ecf1 | 757 | val |= S3C64XX_SPI_MODE_CH_TSZ_WORD; |
230d42d4 JB |
758 | break; |
759 | case 16: | |
760 | val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD; | |
0c92ecf1 | 761 | val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD; |
230d42d4 JB |
762 | break; |
763 | default: | |
764 | val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE; | |
0c92ecf1 | 765 | val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE; |
230d42d4 JB |
766 | break; |
767 | } | |
230d42d4 JB |
768 | |
769 | writel(val, regs + S3C64XX_SPI_MODE_CFG); | |
770 | ||
a5238e36 | 771 | if (sdd->port_conf->clk_from_cmu) { |
b42a81ca JB |
772 | /* Configure Clock */ |
773 | /* There is half-multiplier before the SPI */ | |
774 | clk_set_rate(sdd->src_clk, sdd->cur_speed * 2); | |
775 | /* Enable Clock */ | |
9f667bff | 776 | clk_prepare_enable(sdd->src_clk); |
b42a81ca JB |
777 | } else { |
778 | /* Configure Clock */ | |
779 | val = readl(regs + S3C64XX_SPI_CLK_CFG); | |
780 | val &= ~S3C64XX_SPI_PSR_MASK; | |
781 | val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1) | |
782 | & S3C64XX_SPI_PSR_MASK); | |
783 | writel(val, regs + S3C64XX_SPI_CLK_CFG); | |
784 | ||
785 | /* Enable Clock */ | |
786 | val = readl(regs + S3C64XX_SPI_CLK_CFG); | |
787 | val |= S3C64XX_SPI_ENCLK_ENABLE; | |
788 | writel(val, regs + S3C64XX_SPI_CLK_CFG); | |
789 | } | |
230d42d4 JB |
790 | } |
791 | ||
230d42d4 JB |
792 | #define XFER_DMAADDR_INVALID DMA_BIT_MASK(32) |
793 | ||
794 | static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd, | |
795 | struct spi_message *msg) | |
796 | { | |
797 | struct device *dev = &sdd->pdev->dev; | |
798 | struct spi_transfer *xfer; | |
799 | ||
7e995556 | 800 | if (is_polling(sdd) || msg->is_dma_mapped) |
230d42d4 JB |
801 | return 0; |
802 | ||
803 | /* First mark all xfer unmapped */ | |
804 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { | |
805 | xfer->rx_dma = XFER_DMAADDR_INVALID; | |
806 | xfer->tx_dma = XFER_DMAADDR_INVALID; | |
807 | } | |
808 | ||
809 | /* Map until end or first fail */ | |
810 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { | |
811 | ||
a5238e36 | 812 | if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1)) |
e02ddd44 JB |
813 | continue; |
814 | ||
230d42d4 | 815 | if (xfer->tx_buf != NULL) { |
251ee478 JB |
816 | xfer->tx_dma = dma_map_single(dev, |
817 | (void *)xfer->tx_buf, xfer->len, | |
818 | DMA_TO_DEVICE); | |
230d42d4 JB |
819 | if (dma_mapping_error(dev, xfer->tx_dma)) { |
820 | dev_err(dev, "dma_map_single Tx failed\n"); | |
821 | xfer->tx_dma = XFER_DMAADDR_INVALID; | |
822 | return -ENOMEM; | |
823 | } | |
824 | } | |
825 | ||
826 | if (xfer->rx_buf != NULL) { | |
827 | xfer->rx_dma = dma_map_single(dev, xfer->rx_buf, | |
828 | xfer->len, DMA_FROM_DEVICE); | |
829 | if (dma_mapping_error(dev, xfer->rx_dma)) { | |
830 | dev_err(dev, "dma_map_single Rx failed\n"); | |
831 | dma_unmap_single(dev, xfer->tx_dma, | |
832 | xfer->len, DMA_TO_DEVICE); | |
833 | xfer->tx_dma = XFER_DMAADDR_INVALID; | |
834 | xfer->rx_dma = XFER_DMAADDR_INVALID; | |
835 | return -ENOMEM; | |
836 | } | |
837 | } | |
838 | } | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
843 | static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd, | |
844 | struct spi_message *msg) | |
845 | { | |
846 | struct device *dev = &sdd->pdev->dev; | |
847 | struct spi_transfer *xfer; | |
848 | ||
7e995556 | 849 | if (is_polling(sdd) || msg->is_dma_mapped) |
230d42d4 JB |
850 | return; |
851 | ||
852 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { | |
853 | ||
a5238e36 | 854 | if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1)) |
e02ddd44 JB |
855 | continue; |
856 | ||
230d42d4 JB |
857 | if (xfer->rx_buf != NULL |
858 | && xfer->rx_dma != XFER_DMAADDR_INVALID) | |
859 | dma_unmap_single(dev, xfer->rx_dma, | |
860 | xfer->len, DMA_FROM_DEVICE); | |
861 | ||
862 | if (xfer->tx_buf != NULL | |
863 | && xfer->tx_dma != XFER_DMAADDR_INVALID) | |
864 | dma_unmap_single(dev, xfer->tx_dma, | |
865 | xfer->len, DMA_TO_DEVICE); | |
866 | } | |
867 | } | |
868 | ||
ad2a99af MB |
869 | static int s3c64xx_spi_transfer_one_message(struct spi_master *master, |
870 | struct spi_message *msg) | |
230d42d4 | 871 | { |
ad2a99af | 872 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); |
230d42d4 JB |
873 | struct spi_device *spi = msg->spi; |
874 | struct s3c64xx_spi_csinfo *cs = spi->controller_data; | |
875 | struct spi_transfer *xfer; | |
876 | int status = 0, cs_toggle = 0; | |
877 | u32 speed; | |
878 | u8 bpw; | |
879 | ||
880 | /* If Master's(controller) state differs from that needed by Slave */ | |
881 | if (sdd->cur_speed != spi->max_speed_hz | |
882 | || sdd->cur_mode != spi->mode | |
883 | || sdd->cur_bpw != spi->bits_per_word) { | |
884 | sdd->cur_bpw = spi->bits_per_word; | |
885 | sdd->cur_speed = spi->max_speed_hz; | |
886 | sdd->cur_mode = spi->mode; | |
887 | s3c64xx_spi_config(sdd); | |
888 | } | |
889 | ||
890 | /* Map all the transfers if needed */ | |
891 | if (s3c64xx_spi_map_mssg(sdd, msg)) { | |
892 | dev_err(&spi->dev, | |
893 | "Xfer: Unable to map message buffers!\n"); | |
894 | status = -ENOMEM; | |
895 | goto out; | |
896 | } | |
897 | ||
898 | /* Configure feedback delay */ | |
899 | writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK); | |
900 | ||
901 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { | |
902 | ||
903 | unsigned long flags; | |
904 | int use_dma; | |
905 | ||
906 | INIT_COMPLETION(sdd->xfer_completion); | |
907 | ||
908 | /* Only BPW and Speed may change across transfers */ | |
766ed704 | 909 | bpw = xfer->bits_per_word; |
230d42d4 JB |
910 | speed = xfer->speed_hz ? : spi->max_speed_hz; |
911 | ||
0c92ecf1 JB |
912 | if (xfer->len % (bpw / 8)) { |
913 | dev_err(&spi->dev, | |
914 | "Xfer length(%u) not a multiple of word size(%u)\n", | |
915 | xfer->len, bpw / 8); | |
916 | status = -EIO; | |
917 | goto out; | |
918 | } | |
919 | ||
230d42d4 JB |
920 | if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) { |
921 | sdd->cur_bpw = bpw; | |
922 | sdd->cur_speed = speed; | |
923 | s3c64xx_spi_config(sdd); | |
924 | } | |
925 | ||
926 | /* Polling method for xfers not bigger than FIFO capacity */ | |
78843727 | 927 | use_dma = 0; |
7e995556 G |
928 | if (!is_polling(sdd) && |
929 | (sdd->rx_dma.ch && sdd->tx_dma.ch && | |
930 | (xfer->len > ((FIFO_LVL_MASK(sdd) >> 1) + 1)))) | |
230d42d4 JB |
931 | use_dma = 1; |
932 | ||
933 | spin_lock_irqsave(&sdd->lock, flags); | |
934 | ||
935 | /* Pending only which is to be done */ | |
936 | sdd->state &= ~RXBUSY; | |
937 | sdd->state &= ~TXBUSY; | |
938 | ||
939 | enable_datapath(sdd, spi, xfer, use_dma); | |
940 | ||
941 | /* Slave Select */ | |
942 | enable_cs(sdd, spi); | |
943 | ||
230d42d4 JB |
944 | spin_unlock_irqrestore(&sdd->lock, flags); |
945 | ||
946 | status = wait_for_xfer(sdd, xfer, use_dma); | |
947 | ||
230d42d4 | 948 | if (status) { |
75bf3361 | 949 | dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n", |
230d42d4 JB |
950 | xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0, |
951 | (sdd->state & RXBUSY) ? 'f' : 'p', | |
952 | (sdd->state & TXBUSY) ? 'f' : 'p', | |
953 | xfer->len); | |
954 | ||
955 | if (use_dma) { | |
956 | if (xfer->tx_buf != NULL | |
957 | && (sdd->state & TXBUSY)) | |
78843727 | 958 | s3c64xx_spi_dma_stop(sdd, &sdd->tx_dma); |
230d42d4 JB |
959 | if (xfer->rx_buf != NULL |
960 | && (sdd->state & RXBUSY)) | |
78843727 | 961 | s3c64xx_spi_dma_stop(sdd, &sdd->rx_dma); |
230d42d4 JB |
962 | } |
963 | ||
964 | goto out; | |
965 | } | |
966 | ||
967 | if (xfer->delay_usecs) | |
968 | udelay(xfer->delay_usecs); | |
969 | ||
970 | if (xfer->cs_change) { | |
971 | /* Hint that the next mssg is gonna be | |
972 | for the same device */ | |
973 | if (list_is_last(&xfer->transfer_list, | |
974 | &msg->transfers)) | |
975 | cs_toggle = 1; | |
230d42d4 JB |
976 | } |
977 | ||
978 | msg->actual_length += xfer->len; | |
979 | ||
980 | flush_fifo(sdd); | |
981 | } | |
982 | ||
983 | out: | |
984 | if (!cs_toggle || status) | |
985 | disable_cs(sdd, spi); | |
986 | else | |
987 | sdd->tgl_spi = spi; | |
988 | ||
989 | s3c64xx_spi_unmap_mssg(sdd, msg); | |
990 | ||
991 | msg->status = status; | |
992 | ||
ad2a99af MB |
993 | spi_finalize_current_message(master); |
994 | ||
995 | return 0; | |
230d42d4 JB |
996 | } |
997 | ||
2b908075 | 998 | static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata( |
2b908075 TA |
999 | struct spi_device *spi) |
1000 | { | |
1001 | struct s3c64xx_spi_csinfo *cs; | |
4732cc63 | 1002 | struct device_node *slave_np, *data_np = NULL; |
3146beec | 1003 | struct s3c64xx_spi_driver_data *sdd; |
2b908075 TA |
1004 | u32 fb_delay = 0; |
1005 | ||
3146beec | 1006 | sdd = spi_master_get_devdata(spi->master); |
2b908075 TA |
1007 | slave_np = spi->dev.of_node; |
1008 | if (!slave_np) { | |
1009 | dev_err(&spi->dev, "device node not found\n"); | |
1010 | return ERR_PTR(-EINVAL); | |
1011 | } | |
1012 | ||
06455bbc | 1013 | data_np = of_get_child_by_name(slave_np, "controller-data"); |
2b908075 TA |
1014 | if (!data_np) { |
1015 | dev_err(&spi->dev, "child node 'controller-data' not found\n"); | |
1016 | return ERR_PTR(-EINVAL); | |
1017 | } | |
1018 | ||
1019 | cs = kzalloc(sizeof(*cs), GFP_KERNEL); | |
1020 | if (!cs) { | |
75bf3361 | 1021 | dev_err(&spi->dev, "could not allocate memory for controller data\n"); |
06455bbc | 1022 | of_node_put(data_np); |
2b908075 TA |
1023 | return ERR_PTR(-ENOMEM); |
1024 | } | |
1025 | ||
3146beec G |
1026 | /* The CS line is asserted/deasserted by the gpio pin */ |
1027 | if (sdd->cs_gpio) | |
1028 | cs->line = of_get_named_gpio(data_np, "cs-gpio", 0); | |
1029 | ||
2b908075 | 1030 | if (!gpio_is_valid(cs->line)) { |
75bf3361 | 1031 | dev_err(&spi->dev, "chip select gpio is not specified or invalid\n"); |
2b908075 | 1032 | kfree(cs); |
06455bbc | 1033 | of_node_put(data_np); |
2b908075 TA |
1034 | return ERR_PTR(-EINVAL); |
1035 | } | |
1036 | ||
1037 | of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay); | |
1038 | cs->fb_delay = fb_delay; | |
06455bbc | 1039 | of_node_put(data_np); |
2b908075 TA |
1040 | return cs; |
1041 | } | |
1042 | ||
230d42d4 JB |
1043 | /* |
1044 | * Here we only check the validity of requested configuration | |
1045 | * and save the configuration in a local data-structure. | |
1046 | * The controller is actually configured only just before we | |
1047 | * get a message to transfer. | |
1048 | */ | |
1049 | static int s3c64xx_spi_setup(struct spi_device *spi) | |
1050 | { | |
1051 | struct s3c64xx_spi_csinfo *cs = spi->controller_data; | |
1052 | struct s3c64xx_spi_driver_data *sdd; | |
ad7de729 | 1053 | struct s3c64xx_spi_info *sci; |
2b908075 | 1054 | int err; |
230d42d4 | 1055 | |
2b908075 TA |
1056 | sdd = spi_master_get_devdata(spi->master); |
1057 | if (!cs && spi->dev.of_node) { | |
5c725b34 | 1058 | cs = s3c64xx_get_slave_ctrldata(spi); |
2b908075 TA |
1059 | spi->controller_data = cs; |
1060 | } | |
1061 | ||
1062 | if (IS_ERR_OR_NULL(cs)) { | |
230d42d4 JB |
1063 | dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select); |
1064 | return -ENODEV; | |
1065 | } | |
1066 | ||
0149871c TF |
1067 | if (!spi_get_ctldata(spi)) { |
1068 | /* Request gpio only if cs line is asserted by gpio pins */ | |
1069 | if (sdd->cs_gpio) { | |
1070 | err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH, | |
1071 | dev_name(&spi->dev)); | |
1072 | if (err) { | |
1073 | dev_err(&spi->dev, | |
1074 | "Failed to get /CS gpio [%d]: %d\n", | |
1075 | cs->line, err); | |
1076 | goto err_gpio_req; | |
1077 | } | |
1c20c200 | 1078 | } |
1c20c200 | 1079 | |
3146beec | 1080 | spi_set_ctldata(spi, cs); |
0149871c | 1081 | } |
3146beec | 1082 | |
230d42d4 JB |
1083 | sci = sdd->cntrlr_info; |
1084 | ||
b97b6621 MB |
1085 | pm_runtime_get_sync(&sdd->pdev->dev); |
1086 | ||
230d42d4 | 1087 | /* Check if we can provide the requested rate */ |
a5238e36 | 1088 | if (!sdd->port_conf->clk_from_cmu) { |
b42a81ca JB |
1089 | u32 psr, speed; |
1090 | ||
1091 | /* Max possible */ | |
1092 | speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1); | |
1093 | ||
1094 | if (spi->max_speed_hz > speed) | |
1095 | spi->max_speed_hz = speed; | |
1096 | ||
1097 | psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1; | |
1098 | psr &= S3C64XX_SPI_PSR_MASK; | |
1099 | if (psr == S3C64XX_SPI_PSR_MASK) | |
1100 | psr--; | |
1101 | ||
1102 | speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1); | |
1103 | if (spi->max_speed_hz < speed) { | |
1104 | if (psr+1 < S3C64XX_SPI_PSR_MASK) { | |
1105 | psr++; | |
1106 | } else { | |
1107 | err = -EINVAL; | |
1108 | goto setup_exit; | |
1109 | } | |
1110 | } | |
230d42d4 | 1111 | |
b42a81ca | 1112 | speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1); |
2b908075 | 1113 | if (spi->max_speed_hz >= speed) { |
b42a81ca | 1114 | spi->max_speed_hz = speed; |
2b908075 | 1115 | } else { |
e1b0f0df MB |
1116 | dev_err(&spi->dev, "Can't set %dHz transfer speed\n", |
1117 | spi->max_speed_hz); | |
230d42d4 | 1118 | err = -EINVAL; |
2b908075 TA |
1119 | goto setup_exit; |
1120 | } | |
230d42d4 JB |
1121 | } |
1122 | ||
b97b6621 | 1123 | pm_runtime_put(&sdd->pdev->dev); |
2b908075 TA |
1124 | disable_cs(sdd, spi); |
1125 | return 0; | |
b97b6621 | 1126 | |
230d42d4 | 1127 | setup_exit: |
230d42d4 JB |
1128 | /* setup() returns with device de-selected */ |
1129 | disable_cs(sdd, spi); | |
1130 | ||
2b908075 TA |
1131 | gpio_free(cs->line); |
1132 | spi_set_ctldata(spi, NULL); | |
1133 | ||
1134 | err_gpio_req: | |
5bee3b94 SN |
1135 | if (spi->dev.of_node) |
1136 | kfree(cs); | |
2b908075 | 1137 | |
230d42d4 JB |
1138 | return err; |
1139 | } | |
1140 | ||
1c20c200 TA |
1141 | static void s3c64xx_spi_cleanup(struct spi_device *spi) |
1142 | { | |
1143 | struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi); | |
3146beec | 1144 | struct s3c64xx_spi_driver_data *sdd; |
1c20c200 | 1145 | |
3146beec G |
1146 | sdd = spi_master_get_devdata(spi->master); |
1147 | if (cs && sdd->cs_gpio) { | |
1c20c200 | 1148 | gpio_free(cs->line); |
2b908075 TA |
1149 | if (spi->dev.of_node) |
1150 | kfree(cs); | |
1151 | } | |
1c20c200 TA |
1152 | spi_set_ctldata(spi, NULL); |
1153 | } | |
1154 | ||
c2573128 MB |
1155 | static irqreturn_t s3c64xx_spi_irq(int irq, void *data) |
1156 | { | |
1157 | struct s3c64xx_spi_driver_data *sdd = data; | |
1158 | struct spi_master *spi = sdd->master; | |
375981f2 | 1159 | unsigned int val, clr = 0; |
c2573128 | 1160 | |
375981f2 | 1161 | val = readl(sdd->regs + S3C64XX_SPI_STATUS); |
c2573128 | 1162 | |
375981f2 G |
1163 | if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) { |
1164 | clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR; | |
c2573128 | 1165 | dev_err(&spi->dev, "RX overrun\n"); |
375981f2 G |
1166 | } |
1167 | if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) { | |
1168 | clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR; | |
c2573128 | 1169 | dev_err(&spi->dev, "RX underrun\n"); |
375981f2 G |
1170 | } |
1171 | if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) { | |
1172 | clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR; | |
c2573128 | 1173 | dev_err(&spi->dev, "TX overrun\n"); |
375981f2 G |
1174 | } |
1175 | if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) { | |
1176 | clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR; | |
c2573128 | 1177 | dev_err(&spi->dev, "TX underrun\n"); |
375981f2 G |
1178 | } |
1179 | ||
1180 | /* Clear the pending irq by setting and then clearing it */ | |
1181 | writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR); | |
1182 | writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR); | |
c2573128 MB |
1183 | |
1184 | return IRQ_HANDLED; | |
1185 | } | |
1186 | ||
230d42d4 JB |
1187 | static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel) |
1188 | { | |
ad7de729 | 1189 | struct s3c64xx_spi_info *sci = sdd->cntrlr_info; |
230d42d4 JB |
1190 | void __iomem *regs = sdd->regs; |
1191 | unsigned int val; | |
1192 | ||
1193 | sdd->cur_speed = 0; | |
1194 | ||
5fc3e831 | 1195 | writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL); |
230d42d4 JB |
1196 | |
1197 | /* Disable Interrupts - we use Polling if not DMA mode */ | |
1198 | writel(0, regs + S3C64XX_SPI_INT_EN); | |
1199 | ||
a5238e36 | 1200 | if (!sdd->port_conf->clk_from_cmu) |
b42a81ca | 1201 | writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT, |
230d42d4 JB |
1202 | regs + S3C64XX_SPI_CLK_CFG); |
1203 | writel(0, regs + S3C64XX_SPI_MODE_CFG); | |
1204 | writel(0, regs + S3C64XX_SPI_PACKET_CNT); | |
1205 | ||
375981f2 G |
1206 | /* Clear any irq pending bits, should set and clear the bits */ |
1207 | val = S3C64XX_SPI_PND_RX_OVERRUN_CLR | | |
1208 | S3C64XX_SPI_PND_RX_UNDERRUN_CLR | | |
1209 | S3C64XX_SPI_PND_TX_OVERRUN_CLR | | |
1210 | S3C64XX_SPI_PND_TX_UNDERRUN_CLR; | |
1211 | writel(val, regs + S3C64XX_SPI_PENDING_CLR); | |
1212 | writel(0, regs + S3C64XX_SPI_PENDING_CLR); | |
230d42d4 JB |
1213 | |
1214 | writel(0, regs + S3C64XX_SPI_SWAP_CFG); | |
1215 | ||
1216 | val = readl(regs + S3C64XX_SPI_MODE_CFG); | |
1217 | val &= ~S3C64XX_SPI_MODE_4BURST; | |
1218 | val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF); | |
1219 | val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF); | |
1220 | writel(val, regs + S3C64XX_SPI_MODE_CFG); | |
1221 | ||
1222 | flush_fifo(sdd); | |
1223 | } | |
1224 | ||
2b908075 | 1225 | #ifdef CONFIG_OF |
75bf3361 | 1226 | static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) |
2b908075 TA |
1227 | { |
1228 | struct s3c64xx_spi_info *sci; | |
1229 | u32 temp; | |
1230 | ||
1231 | sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL); | |
1232 | if (!sci) { | |
1233 | dev_err(dev, "memory allocation for spi_info failed\n"); | |
1234 | return ERR_PTR(-ENOMEM); | |
1235 | } | |
1236 | ||
1237 | if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) { | |
75bf3361 | 1238 | dev_warn(dev, "spi bus clock parent not specified, using clock at index 0 as parent\n"); |
2b908075 TA |
1239 | sci->src_clk_nr = 0; |
1240 | } else { | |
1241 | sci->src_clk_nr = temp; | |
1242 | } | |
1243 | ||
1244 | if (of_property_read_u32(dev->of_node, "num-cs", &temp)) { | |
75bf3361 | 1245 | dev_warn(dev, "number of chip select lines not specified, assuming 1 chip select line\n"); |
2b908075 TA |
1246 | sci->num_cs = 1; |
1247 | } else { | |
1248 | sci->num_cs = temp; | |
1249 | } | |
1250 | ||
1251 | return sci; | |
1252 | } | |
1253 | #else | |
1254 | static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) | |
1255 | { | |
1256 | return dev->platform_data; | |
1257 | } | |
2b908075 TA |
1258 | #endif |
1259 | ||
1260 | static const struct of_device_id s3c64xx_spi_dt_match[]; | |
1261 | ||
a5238e36 TA |
1262 | static inline struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config( |
1263 | struct platform_device *pdev) | |
1264 | { | |
2b908075 TA |
1265 | #ifdef CONFIG_OF |
1266 | if (pdev->dev.of_node) { | |
1267 | const struct of_device_id *match; | |
1268 | match = of_match_node(s3c64xx_spi_dt_match, pdev->dev.of_node); | |
1269 | return (struct s3c64xx_spi_port_config *)match->data; | |
1270 | } | |
1271 | #endif | |
a5238e36 TA |
1272 | return (struct s3c64xx_spi_port_config *) |
1273 | platform_get_device_id(pdev)->driver_data; | |
1274 | } | |
1275 | ||
2deff8d6 | 1276 | static int s3c64xx_spi_probe(struct platform_device *pdev) |
230d42d4 | 1277 | { |
2b908075 | 1278 | struct resource *mem_res; |
b5be04d3 | 1279 | struct resource *res; |
230d42d4 | 1280 | struct s3c64xx_spi_driver_data *sdd; |
2b908075 | 1281 | struct s3c64xx_spi_info *sci = pdev->dev.platform_data; |
230d42d4 | 1282 | struct spi_master *master; |
c2573128 | 1283 | int ret, irq; |
a24d850b | 1284 | char clk_name[16]; |
230d42d4 | 1285 | |
2b908075 TA |
1286 | if (!sci && pdev->dev.of_node) { |
1287 | sci = s3c64xx_spi_parse_dt(&pdev->dev); | |
1288 | if (IS_ERR(sci)) | |
1289 | return PTR_ERR(sci); | |
230d42d4 JB |
1290 | } |
1291 | ||
2b908075 | 1292 | if (!sci) { |
230d42d4 JB |
1293 | dev_err(&pdev->dev, "platform_data missing!\n"); |
1294 | return -ENODEV; | |
1295 | } | |
1296 | ||
230d42d4 JB |
1297 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
1298 | if (mem_res == NULL) { | |
1299 | dev_err(&pdev->dev, "Unable to get SPI MEM resource\n"); | |
1300 | return -ENXIO; | |
1301 | } | |
1302 | ||
c2573128 MB |
1303 | irq = platform_get_irq(pdev, 0); |
1304 | if (irq < 0) { | |
1305 | dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq); | |
1306 | return irq; | |
1307 | } | |
1308 | ||
230d42d4 JB |
1309 | master = spi_alloc_master(&pdev->dev, |
1310 | sizeof(struct s3c64xx_spi_driver_data)); | |
1311 | if (master == NULL) { | |
1312 | dev_err(&pdev->dev, "Unable to allocate SPI Master\n"); | |
1313 | return -ENOMEM; | |
1314 | } | |
1315 | ||
230d42d4 JB |
1316 | platform_set_drvdata(pdev, master); |
1317 | ||
1318 | sdd = spi_master_get_devdata(master); | |
a5238e36 | 1319 | sdd->port_conf = s3c64xx_spi_get_port_config(pdev); |
230d42d4 JB |
1320 | sdd->master = master; |
1321 | sdd->cntrlr_info = sci; | |
1322 | sdd->pdev = pdev; | |
1323 | sdd->sfr_start = mem_res->start; | |
3146beec | 1324 | sdd->cs_gpio = true; |
2b908075 | 1325 | if (pdev->dev.of_node) { |
3146beec G |
1326 | if (!of_find_property(pdev->dev.of_node, "cs-gpio", NULL)) |
1327 | sdd->cs_gpio = false; | |
1328 | ||
2b908075 TA |
1329 | ret = of_alias_get_id(pdev->dev.of_node, "spi"); |
1330 | if (ret < 0) { | |
75bf3361 JH |
1331 | dev_err(&pdev->dev, "failed to get alias id, errno %d\n", |
1332 | ret); | |
2b908075 TA |
1333 | goto err0; |
1334 | } | |
1335 | sdd->port_id = ret; | |
1336 | } else { | |
1337 | sdd->port_id = pdev->id; | |
1338 | } | |
230d42d4 JB |
1339 | |
1340 | sdd->cur_bpw = 8; | |
1341 | ||
b5be04d3 PV |
1342 | if (!sdd->pdev->dev.of_node) { |
1343 | res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
1344 | if (!res) { | |
db0606ec | 1345 | dev_warn(&pdev->dev, "Unable to get SPI tx dma resource. Switching to poll mode\n"); |
7e995556 G |
1346 | sdd->port_conf->quirks = S3C64XX_SPI_QUIRK_POLL; |
1347 | } else | |
1348 | sdd->tx_dma.dmach = res->start; | |
b5be04d3 PV |
1349 | |
1350 | res = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
1351 | if (!res) { | |
db0606ec | 1352 | dev_warn(&pdev->dev, "Unable to get SPI rx dma resource. Switching to poll mode\n"); |
7e995556 G |
1353 | sdd->port_conf->quirks = S3C64XX_SPI_QUIRK_POLL; |
1354 | } else | |
1355 | sdd->rx_dma.dmach = res->start; | |
b5be04d3 | 1356 | } |
2b908075 | 1357 | |
b5be04d3 PV |
1358 | sdd->tx_dma.direction = DMA_MEM_TO_DEV; |
1359 | sdd->rx_dma.direction = DMA_DEV_TO_MEM; | |
2b908075 TA |
1360 | |
1361 | master->dev.of_node = pdev->dev.of_node; | |
a5238e36 | 1362 | master->bus_num = sdd->port_id; |
230d42d4 | 1363 | master->setup = s3c64xx_spi_setup; |
1c20c200 | 1364 | master->cleanup = s3c64xx_spi_cleanup; |
ad2a99af MB |
1365 | master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer; |
1366 | master->transfer_one_message = s3c64xx_spi_transfer_one_message; | |
1367 | master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer; | |
230d42d4 JB |
1368 | master->num_chipselect = sci->num_cs; |
1369 | master->dma_alignment = 8; | |
24778be2 SW |
1370 | master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) | |
1371 | SPI_BPW_MASK(8); | |
230d42d4 JB |
1372 | /* the spi->mode bits understood by this driver: */ |
1373 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; | |
1374 | ||
b0ee5605 TR |
1375 | sdd->regs = devm_ioremap_resource(&pdev->dev, mem_res); |
1376 | if (IS_ERR(sdd->regs)) { | |
1377 | ret = PTR_ERR(sdd->regs); | |
4eb77006 | 1378 | goto err0; |
230d42d4 JB |
1379 | } |
1380 | ||
00ab5392 | 1381 | if (sci->cfg_gpio && sci->cfg_gpio()) { |
230d42d4 JB |
1382 | dev_err(&pdev->dev, "Unable to config gpio\n"); |
1383 | ret = -EBUSY; | |
4eb77006 | 1384 | goto err0; |
230d42d4 JB |
1385 | } |
1386 | ||
1387 | /* Setup clocks */ | |
4eb77006 | 1388 | sdd->clk = devm_clk_get(&pdev->dev, "spi"); |
230d42d4 JB |
1389 | if (IS_ERR(sdd->clk)) { |
1390 | dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n"); | |
1391 | ret = PTR_ERR(sdd->clk); | |
00ab5392 | 1392 | goto err0; |
230d42d4 JB |
1393 | } |
1394 | ||
9f667bff | 1395 | if (clk_prepare_enable(sdd->clk)) { |
230d42d4 JB |
1396 | dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n"); |
1397 | ret = -EBUSY; | |
00ab5392 | 1398 | goto err0; |
230d42d4 JB |
1399 | } |
1400 | ||
a24d850b | 1401 | sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr); |
4eb77006 | 1402 | sdd->src_clk = devm_clk_get(&pdev->dev, clk_name); |
b0d5d6e5 | 1403 | if (IS_ERR(sdd->src_clk)) { |
230d42d4 | 1404 | dev_err(&pdev->dev, |
a24d850b | 1405 | "Unable to acquire clock '%s'\n", clk_name); |
b0d5d6e5 | 1406 | ret = PTR_ERR(sdd->src_clk); |
4eb77006 | 1407 | goto err2; |
230d42d4 JB |
1408 | } |
1409 | ||
9f667bff | 1410 | if (clk_prepare_enable(sdd->src_clk)) { |
a24d850b | 1411 | dev_err(&pdev->dev, "Couldn't enable clock '%s'\n", clk_name); |
230d42d4 | 1412 | ret = -EBUSY; |
4eb77006 | 1413 | goto err2; |
230d42d4 JB |
1414 | } |
1415 | ||
230d42d4 | 1416 | /* Setup Deufult Mode */ |
a5238e36 | 1417 | s3c64xx_spi_hwinit(sdd, sdd->port_id); |
230d42d4 JB |
1418 | |
1419 | spin_lock_init(&sdd->lock); | |
1420 | init_completion(&sdd->xfer_completion); | |
230d42d4 | 1421 | |
4eb77006 JH |
1422 | ret = devm_request_irq(&pdev->dev, irq, s3c64xx_spi_irq, 0, |
1423 | "spi-s3c64xx", sdd); | |
c2573128 MB |
1424 | if (ret != 0) { |
1425 | dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n", | |
1426 | irq, ret); | |
4eb77006 | 1427 | goto err3; |
c2573128 MB |
1428 | } |
1429 | ||
1430 | writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN | | |
1431 | S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN, | |
1432 | sdd->regs + S3C64XX_SPI_INT_EN); | |
1433 | ||
230d42d4 JB |
1434 | if (spi_register_master(master)) { |
1435 | dev_err(&pdev->dev, "cannot register SPI master\n"); | |
1436 | ret = -EBUSY; | |
4eb77006 | 1437 | goto err3; |
230d42d4 JB |
1438 | } |
1439 | ||
75bf3361 | 1440 | dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n", |
a5238e36 | 1441 | sdd->port_id, master->num_chipselect); |
c65bc4a8 JH |
1442 | dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tDMA=[Rx-%d, Tx-%d]\n", |
1443 | mem_res, | |
82ab8cd7 | 1444 | sdd->rx_dma.dmach, sdd->tx_dma.dmach); |
230d42d4 | 1445 | |
b97b6621 MB |
1446 | pm_runtime_enable(&pdev->dev); |
1447 | ||
230d42d4 JB |
1448 | return 0; |
1449 | ||
4eb77006 | 1450 | err3: |
9f667bff | 1451 | clk_disable_unprepare(sdd->src_clk); |
4eb77006 | 1452 | err2: |
9f667bff | 1453 | clk_disable_unprepare(sdd->clk); |
230d42d4 | 1454 | err0: |
230d42d4 JB |
1455 | spi_master_put(master); |
1456 | ||
1457 | return ret; | |
1458 | } | |
1459 | ||
1460 | static int s3c64xx_spi_remove(struct platform_device *pdev) | |
1461 | { | |
1462 | struct spi_master *master = spi_master_get(platform_get_drvdata(pdev)); | |
1463 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); | |
230d42d4 | 1464 | |
b97b6621 MB |
1465 | pm_runtime_disable(&pdev->dev); |
1466 | ||
230d42d4 JB |
1467 | spi_unregister_master(master); |
1468 | ||
c2573128 MB |
1469 | writel(0, sdd->regs + S3C64XX_SPI_INT_EN); |
1470 | ||
9f667bff | 1471 | clk_disable_unprepare(sdd->src_clk); |
230d42d4 | 1472 | |
9f667bff | 1473 | clk_disable_unprepare(sdd->clk); |
230d42d4 | 1474 | |
230d42d4 JB |
1475 | spi_master_put(master); |
1476 | ||
1477 | return 0; | |
1478 | } | |
1479 | ||
997230d0 | 1480 | #ifdef CONFIG_PM_SLEEP |
e25d0bf9 | 1481 | static int s3c64xx_spi_suspend(struct device *dev) |
230d42d4 | 1482 | { |
9a2a5245 | 1483 | struct spi_master *master = dev_get_drvdata(dev); |
230d42d4 | 1484 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); |
230d42d4 | 1485 | |
ad2a99af | 1486 | spi_master_suspend(master); |
230d42d4 JB |
1487 | |
1488 | /* Disable the clock */ | |
9f667bff TA |
1489 | clk_disable_unprepare(sdd->src_clk); |
1490 | clk_disable_unprepare(sdd->clk); | |
230d42d4 JB |
1491 | |
1492 | sdd->cur_speed = 0; /* Output Clock is stopped */ | |
1493 | ||
1494 | return 0; | |
1495 | } | |
1496 | ||
e25d0bf9 | 1497 | static int s3c64xx_spi_resume(struct device *dev) |
230d42d4 | 1498 | { |
9a2a5245 | 1499 | struct spi_master *master = dev_get_drvdata(dev); |
230d42d4 | 1500 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); |
ad7de729 | 1501 | struct s3c64xx_spi_info *sci = sdd->cntrlr_info; |
230d42d4 | 1502 | |
00ab5392 | 1503 | if (sci->cfg_gpio) |
2b908075 | 1504 | sci->cfg_gpio(); |
230d42d4 JB |
1505 | |
1506 | /* Enable the clock */ | |
9f667bff TA |
1507 | clk_prepare_enable(sdd->src_clk); |
1508 | clk_prepare_enable(sdd->clk); | |
230d42d4 | 1509 | |
a5238e36 | 1510 | s3c64xx_spi_hwinit(sdd, sdd->port_id); |
230d42d4 | 1511 | |
ad2a99af | 1512 | spi_master_resume(master); |
230d42d4 JB |
1513 | |
1514 | return 0; | |
1515 | } | |
997230d0 | 1516 | #endif /* CONFIG_PM_SLEEP */ |
230d42d4 | 1517 | |
b97b6621 MB |
1518 | #ifdef CONFIG_PM_RUNTIME |
1519 | static int s3c64xx_spi_runtime_suspend(struct device *dev) | |
1520 | { | |
9a2a5245 | 1521 | struct spi_master *master = dev_get_drvdata(dev); |
b97b6621 MB |
1522 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); |
1523 | ||
9f667bff TA |
1524 | clk_disable_unprepare(sdd->clk); |
1525 | clk_disable_unprepare(sdd->src_clk); | |
b97b6621 MB |
1526 | |
1527 | return 0; | |
1528 | } | |
1529 | ||
1530 | static int s3c64xx_spi_runtime_resume(struct device *dev) | |
1531 | { | |
9a2a5245 | 1532 | struct spi_master *master = dev_get_drvdata(dev); |
b97b6621 MB |
1533 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); |
1534 | ||
9f667bff TA |
1535 | clk_prepare_enable(sdd->src_clk); |
1536 | clk_prepare_enable(sdd->clk); | |
b97b6621 MB |
1537 | |
1538 | return 0; | |
1539 | } | |
1540 | #endif /* CONFIG_PM_RUNTIME */ | |
1541 | ||
e25d0bf9 MB |
1542 | static const struct dev_pm_ops s3c64xx_spi_pm = { |
1543 | SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume) | |
b97b6621 MB |
1544 | SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend, |
1545 | s3c64xx_spi_runtime_resume, NULL) | |
e25d0bf9 MB |
1546 | }; |
1547 | ||
10ce0473 | 1548 | static struct s3c64xx_spi_port_config s3c2443_spi_port_config = { |
a5238e36 TA |
1549 | .fifo_lvl_mask = { 0x7f }, |
1550 | .rx_lvl_offset = 13, | |
1551 | .tx_st_done = 21, | |
1552 | .high_speed = true, | |
1553 | }; | |
1554 | ||
10ce0473 | 1555 | static struct s3c64xx_spi_port_config s3c6410_spi_port_config = { |
a5238e36 TA |
1556 | .fifo_lvl_mask = { 0x7f, 0x7F }, |
1557 | .rx_lvl_offset = 13, | |
1558 | .tx_st_done = 21, | |
1559 | }; | |
1560 | ||
10ce0473 | 1561 | static struct s3c64xx_spi_port_config s5p64x0_spi_port_config = { |
a5238e36 TA |
1562 | .fifo_lvl_mask = { 0x1ff, 0x7F }, |
1563 | .rx_lvl_offset = 15, | |
1564 | .tx_st_done = 25, | |
1565 | }; | |
1566 | ||
10ce0473 | 1567 | static struct s3c64xx_spi_port_config s5pc100_spi_port_config = { |
a5238e36 TA |
1568 | .fifo_lvl_mask = { 0x7f, 0x7F }, |
1569 | .rx_lvl_offset = 13, | |
1570 | .tx_st_done = 21, | |
1571 | .high_speed = true, | |
1572 | }; | |
1573 | ||
10ce0473 | 1574 | static struct s3c64xx_spi_port_config s5pv210_spi_port_config = { |
a5238e36 TA |
1575 | .fifo_lvl_mask = { 0x1ff, 0x7F }, |
1576 | .rx_lvl_offset = 15, | |
1577 | .tx_st_done = 25, | |
1578 | .high_speed = true, | |
1579 | }; | |
1580 | ||
10ce0473 | 1581 | static struct s3c64xx_spi_port_config exynos4_spi_port_config = { |
a5238e36 TA |
1582 | .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F }, |
1583 | .rx_lvl_offset = 15, | |
1584 | .tx_st_done = 25, | |
1585 | .high_speed = true, | |
1586 | .clk_from_cmu = true, | |
1587 | }; | |
1588 | ||
bff82038 G |
1589 | static struct s3c64xx_spi_port_config exynos5440_spi_port_config = { |
1590 | .fifo_lvl_mask = { 0x1ff }, | |
1591 | .rx_lvl_offset = 15, | |
1592 | .tx_st_done = 25, | |
1593 | .high_speed = true, | |
1594 | .clk_from_cmu = true, | |
1595 | .quirks = S3C64XX_SPI_QUIRK_POLL, | |
1596 | }; | |
1597 | ||
a5238e36 TA |
1598 | static struct platform_device_id s3c64xx_spi_driver_ids[] = { |
1599 | { | |
1600 | .name = "s3c2443-spi", | |
1601 | .driver_data = (kernel_ulong_t)&s3c2443_spi_port_config, | |
1602 | }, { | |
1603 | .name = "s3c6410-spi", | |
1604 | .driver_data = (kernel_ulong_t)&s3c6410_spi_port_config, | |
1605 | }, { | |
1606 | .name = "s5p64x0-spi", | |
1607 | .driver_data = (kernel_ulong_t)&s5p64x0_spi_port_config, | |
1608 | }, { | |
1609 | .name = "s5pc100-spi", | |
1610 | .driver_data = (kernel_ulong_t)&s5pc100_spi_port_config, | |
1611 | }, { | |
1612 | .name = "s5pv210-spi", | |
1613 | .driver_data = (kernel_ulong_t)&s5pv210_spi_port_config, | |
1614 | }, { | |
1615 | .name = "exynos4210-spi", | |
1616 | .driver_data = (kernel_ulong_t)&exynos4_spi_port_config, | |
1617 | }, | |
1618 | { }, | |
1619 | }; | |
1620 | ||
2b908075 TA |
1621 | static const struct of_device_id s3c64xx_spi_dt_match[] = { |
1622 | { .compatible = "samsung,exynos4210-spi", | |
1623 | .data = (void *)&exynos4_spi_port_config, | |
1624 | }, | |
bff82038 G |
1625 | { .compatible = "samsung,exynos5440-spi", |
1626 | .data = (void *)&exynos5440_spi_port_config, | |
1627 | }, | |
2b908075 TA |
1628 | { }, |
1629 | }; | |
1630 | MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match); | |
2b908075 | 1631 | |
230d42d4 JB |
1632 | static struct platform_driver s3c64xx_spi_driver = { |
1633 | .driver = { | |
1634 | .name = "s3c64xx-spi", | |
1635 | .owner = THIS_MODULE, | |
e25d0bf9 | 1636 | .pm = &s3c64xx_spi_pm, |
2b908075 | 1637 | .of_match_table = of_match_ptr(s3c64xx_spi_dt_match), |
230d42d4 JB |
1638 | }, |
1639 | .remove = s3c64xx_spi_remove, | |
a5238e36 | 1640 | .id_table = s3c64xx_spi_driver_ids, |
230d42d4 JB |
1641 | }; |
1642 | MODULE_ALIAS("platform:s3c64xx-spi"); | |
1643 | ||
1644 | static int __init s3c64xx_spi_init(void) | |
1645 | { | |
1646 | return platform_driver_probe(&s3c64xx_spi_driver, s3c64xx_spi_probe); | |
1647 | } | |
d2a787fc | 1648 | subsys_initcall(s3c64xx_spi_init); |
230d42d4 JB |
1649 | |
1650 | static void __exit s3c64xx_spi_exit(void) | |
1651 | { | |
1652 | platform_driver_unregister(&s3c64xx_spi_driver); | |
1653 | } | |
1654 | module_exit(s3c64xx_spi_exit); | |
1655 | ||
1656 | MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>"); | |
1657 | MODULE_DESCRIPTION("S3C64XX SPI Controller Driver"); | |
1658 | MODULE_LICENSE("GPL"); |