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Commit | Line | Data |
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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> | |
27 | #include <linux/platform_device.h> | |
b97b6621 | 28 | #include <linux/pm_runtime.h> |
230d42d4 | 29 | #include <linux/spi/spi.h> |
1c20c200 | 30 | #include <linux/gpio.h> |
2b908075 TA |
31 | #include <linux/of.h> |
32 | #include <linux/of_gpio.h> | |
230d42d4 JB |
33 | |
34 | #include <mach/dma.h> | |
e6b873c9 | 35 | #include <plat/s3c64xx-spi.h> |
230d42d4 | 36 | |
a5238e36 TA |
37 | #define MAX_SPI_PORTS 3 |
38 | ||
230d42d4 JB |
39 | /* Registers and bit-fields */ |
40 | ||
41 | #define S3C64XX_SPI_CH_CFG 0x00 | |
42 | #define S3C64XX_SPI_CLK_CFG 0x04 | |
43 | #define S3C64XX_SPI_MODE_CFG 0x08 | |
44 | #define S3C64XX_SPI_SLAVE_SEL 0x0C | |
45 | #define S3C64XX_SPI_INT_EN 0x10 | |
46 | #define S3C64XX_SPI_STATUS 0x14 | |
47 | #define S3C64XX_SPI_TX_DATA 0x18 | |
48 | #define S3C64XX_SPI_RX_DATA 0x1C | |
49 | #define S3C64XX_SPI_PACKET_CNT 0x20 | |
50 | #define S3C64XX_SPI_PENDING_CLR 0x24 | |
51 | #define S3C64XX_SPI_SWAP_CFG 0x28 | |
52 | #define S3C64XX_SPI_FB_CLK 0x2C | |
53 | ||
54 | #define S3C64XX_SPI_CH_HS_EN (1<<6) /* High Speed Enable */ | |
55 | #define S3C64XX_SPI_CH_SW_RST (1<<5) | |
56 | #define S3C64XX_SPI_CH_SLAVE (1<<4) | |
57 | #define S3C64XX_SPI_CPOL_L (1<<3) | |
58 | #define S3C64XX_SPI_CPHA_B (1<<2) | |
59 | #define S3C64XX_SPI_CH_RXCH_ON (1<<1) | |
60 | #define S3C64XX_SPI_CH_TXCH_ON (1<<0) | |
61 | ||
62 | #define S3C64XX_SPI_CLKSEL_SRCMSK (3<<9) | |
63 | #define S3C64XX_SPI_CLKSEL_SRCSHFT 9 | |
64 | #define S3C64XX_SPI_ENCLK_ENABLE (1<<8) | |
65 | #define S3C64XX_SPI_PSR_MASK 0xff | |
66 | ||
67 | #define S3C64XX_SPI_MODE_CH_TSZ_BYTE (0<<29) | |
68 | #define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD (1<<29) | |
69 | #define S3C64XX_SPI_MODE_CH_TSZ_WORD (2<<29) | |
70 | #define S3C64XX_SPI_MODE_CH_TSZ_MASK (3<<29) | |
71 | #define S3C64XX_SPI_MODE_BUS_TSZ_BYTE (0<<17) | |
72 | #define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17) | |
73 | #define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17) | |
74 | #define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17) | |
75 | #define S3C64XX_SPI_MODE_RXDMA_ON (1<<2) | |
76 | #define S3C64XX_SPI_MODE_TXDMA_ON (1<<1) | |
77 | #define S3C64XX_SPI_MODE_4BURST (1<<0) | |
78 | ||
79 | #define S3C64XX_SPI_SLAVE_AUTO (1<<1) | |
80 | #define S3C64XX_SPI_SLAVE_SIG_INACT (1<<0) | |
81 | ||
230d42d4 JB |
82 | #define S3C64XX_SPI_INT_TRAILING_EN (1<<6) |
83 | #define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5) | |
84 | #define S3C64XX_SPI_INT_RX_UNDERRUN_EN (1<<4) | |
85 | #define S3C64XX_SPI_INT_TX_OVERRUN_EN (1<<3) | |
86 | #define S3C64XX_SPI_INT_TX_UNDERRUN_EN (1<<2) | |
87 | #define S3C64XX_SPI_INT_RX_FIFORDY_EN (1<<1) | |
88 | #define S3C64XX_SPI_INT_TX_FIFORDY_EN (1<<0) | |
89 | ||
90 | #define S3C64XX_SPI_ST_RX_OVERRUN_ERR (1<<5) | |
91 | #define S3C64XX_SPI_ST_RX_UNDERRUN_ERR (1<<4) | |
92 | #define S3C64XX_SPI_ST_TX_OVERRUN_ERR (1<<3) | |
93 | #define S3C64XX_SPI_ST_TX_UNDERRUN_ERR (1<<2) | |
94 | #define S3C64XX_SPI_ST_RX_FIFORDY (1<<1) | |
95 | #define S3C64XX_SPI_ST_TX_FIFORDY (1<<0) | |
96 | ||
97 | #define S3C64XX_SPI_PACKET_CNT_EN (1<<16) | |
98 | ||
99 | #define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4) | |
100 | #define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3) | |
101 | #define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2) | |
102 | #define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1) | |
103 | #define S3C64XX_SPI_PND_TRAILING_CLR (1<<0) | |
104 | ||
105 | #define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7) | |
106 | #define S3C64XX_SPI_SWAP_RX_BYTE (1<<6) | |
107 | #define S3C64XX_SPI_SWAP_RX_BIT (1<<5) | |
108 | #define S3C64XX_SPI_SWAP_RX_EN (1<<4) | |
109 | #define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3) | |
110 | #define S3C64XX_SPI_SWAP_TX_BYTE (1<<2) | |
111 | #define S3C64XX_SPI_SWAP_TX_BIT (1<<1) | |
112 | #define S3C64XX_SPI_SWAP_TX_EN (1<<0) | |
113 | ||
114 | #define S3C64XX_SPI_FBCLK_MSK (3<<0) | |
115 | ||
a5238e36 TA |
116 | #define FIFO_LVL_MASK(i) ((i)->port_conf->fifo_lvl_mask[i->port_id]) |
117 | #define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & \ | |
118 | (1 << (i)->port_conf->tx_st_done)) ? 1 : 0) | |
119 | #define TX_FIFO_LVL(v, i) (((v) >> 6) & FIFO_LVL_MASK(i)) | |
120 | #define RX_FIFO_LVL(v, i) (((v) >> (i)->port_conf->rx_lvl_offset) & \ | |
121 | FIFO_LVL_MASK(i)) | |
230d42d4 JB |
122 | |
123 | #define S3C64XX_SPI_MAX_TRAILCNT 0x3ff | |
124 | #define S3C64XX_SPI_TRAILCNT_OFF 19 | |
125 | ||
126 | #define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT | |
127 | ||
128 | #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) | |
129 | ||
230d42d4 JB |
130 | #define RXBUSY (1<<2) |
131 | #define TXBUSY (1<<3) | |
132 | ||
82ab8cd7 BK |
133 | struct s3c64xx_spi_dma_data { |
134 | unsigned ch; | |
135 | enum dma_data_direction direction; | |
136 | enum dma_ch dmach; | |
2b908075 | 137 | struct property *dma_prop; |
82ab8cd7 BK |
138 | }; |
139 | ||
a5238e36 TA |
140 | /** |
141 | * struct s3c64xx_spi_info - SPI Controller hardware info | |
142 | * @fifo_lvl_mask: Bit-mask for {TX|RX}_FIFO_LVL bits in SPI_STATUS register. | |
143 | * @rx_lvl_offset: Bit offset of RX_FIFO_LVL bits in SPI_STATUS regiter. | |
144 | * @tx_st_done: Bit offset of TX_DONE bit in SPI_STATUS regiter. | |
145 | * @high_speed: True, if the controller supports HIGH_SPEED_EN bit. | |
146 | * @clk_from_cmu: True, if the controller does not include a clock mux and | |
147 | * prescaler unit. | |
148 | * | |
149 | * The Samsung s3c64xx SPI controller are used on various Samsung SoC's but | |
150 | * differ in some aspects such as the size of the fifo and spi bus clock | |
151 | * setup. Such differences are specified to the driver using this structure | |
152 | * which is provided as driver data to the driver. | |
153 | */ | |
154 | struct s3c64xx_spi_port_config { | |
155 | int fifo_lvl_mask[MAX_SPI_PORTS]; | |
156 | int rx_lvl_offset; | |
157 | int tx_st_done; | |
158 | bool high_speed; | |
159 | bool clk_from_cmu; | |
160 | }; | |
161 | ||
230d42d4 JB |
162 | /** |
163 | * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver. | |
164 | * @clk: Pointer to the spi clock. | |
b0d5d6e5 | 165 | * @src_clk: Pointer to the clock used to generate SPI signals. |
230d42d4 | 166 | * @master: Pointer to the SPI Protocol master. |
230d42d4 JB |
167 | * @cntrlr_info: Platform specific data for the controller this driver manages. |
168 | * @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint. | |
230d42d4 JB |
169 | * @queue: To log SPI xfer requests. |
170 | * @lock: Controller specific lock. | |
171 | * @state: Set of FLAGS to indicate status. | |
172 | * @rx_dmach: Controller's DMA channel for Rx. | |
173 | * @tx_dmach: Controller's DMA channel for Tx. | |
174 | * @sfr_start: BUS address of SPI controller regs. | |
175 | * @regs: Pointer to ioremap'ed controller registers. | |
c2573128 | 176 | * @irq: interrupt |
230d42d4 JB |
177 | * @xfer_completion: To indicate completion of xfer task. |
178 | * @cur_mode: Stores the active configuration of the controller. | |
179 | * @cur_bpw: Stores the active bits per word settings. | |
180 | * @cur_speed: Stores the active xfer clock speed. | |
181 | */ | |
182 | struct s3c64xx_spi_driver_data { | |
183 | void __iomem *regs; | |
184 | struct clk *clk; | |
b0d5d6e5 | 185 | struct clk *src_clk; |
230d42d4 JB |
186 | struct platform_device *pdev; |
187 | struct spi_master *master; | |
ad7de729 | 188 | struct s3c64xx_spi_info *cntrlr_info; |
230d42d4 | 189 | struct spi_device *tgl_spi; |
230d42d4 JB |
190 | struct list_head queue; |
191 | spinlock_t lock; | |
230d42d4 JB |
192 | unsigned long sfr_start; |
193 | struct completion xfer_completion; | |
194 | unsigned state; | |
195 | unsigned cur_mode, cur_bpw; | |
196 | unsigned cur_speed; | |
82ab8cd7 BK |
197 | struct s3c64xx_spi_dma_data rx_dma; |
198 | struct s3c64xx_spi_dma_data tx_dma; | |
39d3e807 | 199 | struct samsung_dma_ops *ops; |
a5238e36 TA |
200 | struct s3c64xx_spi_port_config *port_conf; |
201 | unsigned int port_id; | |
2b908075 | 202 | unsigned long gpios[4]; |
230d42d4 JB |
203 | }; |
204 | ||
205 | static struct s3c2410_dma_client s3c64xx_spi_dma_client = { | |
206 | .name = "samsung-spi-dma", | |
207 | }; | |
208 | ||
209 | static void flush_fifo(struct s3c64xx_spi_driver_data *sdd) | |
210 | { | |
230d42d4 JB |
211 | void __iomem *regs = sdd->regs; |
212 | unsigned long loops; | |
213 | u32 val; | |
214 | ||
215 | writel(0, regs + S3C64XX_SPI_PACKET_CNT); | |
216 | ||
217 | val = readl(regs + S3C64XX_SPI_CH_CFG); | |
218 | val |= S3C64XX_SPI_CH_SW_RST; | |
219 | val &= ~S3C64XX_SPI_CH_HS_EN; | |
220 | writel(val, regs + S3C64XX_SPI_CH_CFG); | |
221 | ||
222 | /* Flush TxFIFO*/ | |
223 | loops = msecs_to_loops(1); | |
224 | do { | |
225 | val = readl(regs + S3C64XX_SPI_STATUS); | |
a5238e36 | 226 | } while (TX_FIFO_LVL(val, sdd) && loops--); |
230d42d4 | 227 | |
be7852a8 MB |
228 | if (loops == 0) |
229 | dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n"); | |
230 | ||
230d42d4 JB |
231 | /* Flush RxFIFO*/ |
232 | loops = msecs_to_loops(1); | |
233 | do { | |
234 | val = readl(regs + S3C64XX_SPI_STATUS); | |
a5238e36 | 235 | if (RX_FIFO_LVL(val, sdd)) |
230d42d4 JB |
236 | readl(regs + S3C64XX_SPI_RX_DATA); |
237 | else | |
238 | break; | |
239 | } while (loops--); | |
240 | ||
be7852a8 MB |
241 | if (loops == 0) |
242 | dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n"); | |
243 | ||
230d42d4 JB |
244 | val = readl(regs + S3C64XX_SPI_CH_CFG); |
245 | val &= ~S3C64XX_SPI_CH_SW_RST; | |
246 | writel(val, regs + S3C64XX_SPI_CH_CFG); | |
247 | ||
248 | val = readl(regs + S3C64XX_SPI_MODE_CFG); | |
249 | val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON); | |
250 | writel(val, regs + S3C64XX_SPI_MODE_CFG); | |
251 | ||
252 | val = readl(regs + S3C64XX_SPI_CH_CFG); | |
253 | val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON); | |
254 | writel(val, regs + S3C64XX_SPI_CH_CFG); | |
255 | } | |
256 | ||
82ab8cd7 | 257 | static void s3c64xx_spi_dmacb(void *data) |
39d3e807 | 258 | { |
82ab8cd7 BK |
259 | struct s3c64xx_spi_driver_data *sdd; |
260 | struct s3c64xx_spi_dma_data *dma = data; | |
39d3e807 BK |
261 | unsigned long flags; |
262 | ||
054ebcc4 | 263 | if (dma->direction == DMA_DEV_TO_MEM) |
82ab8cd7 BK |
264 | sdd = container_of(data, |
265 | struct s3c64xx_spi_driver_data, rx_dma); | |
266 | else | |
267 | sdd = container_of(data, | |
268 | struct s3c64xx_spi_driver_data, tx_dma); | |
269 | ||
39d3e807 BK |
270 | spin_lock_irqsave(&sdd->lock, flags); |
271 | ||
054ebcc4 | 272 | if (dma->direction == DMA_DEV_TO_MEM) { |
82ab8cd7 BK |
273 | sdd->state &= ~RXBUSY; |
274 | if (!(sdd->state & TXBUSY)) | |
275 | complete(&sdd->xfer_completion); | |
276 | } else { | |
277 | sdd->state &= ~TXBUSY; | |
278 | if (!(sdd->state & RXBUSY)) | |
279 | complete(&sdd->xfer_completion); | |
280 | } | |
39d3e807 BK |
281 | |
282 | spin_unlock_irqrestore(&sdd->lock, flags); | |
283 | } | |
284 | ||
82ab8cd7 BK |
285 | static void prepare_dma(struct s3c64xx_spi_dma_data *dma, |
286 | unsigned len, dma_addr_t buf) | |
39d3e807 | 287 | { |
82ab8cd7 | 288 | struct s3c64xx_spi_driver_data *sdd; |
4969c32b BK |
289 | struct samsung_dma_prep info; |
290 | struct samsung_dma_config config; | |
39d3e807 | 291 | |
4969c32b | 292 | if (dma->direction == DMA_DEV_TO_MEM) { |
82ab8cd7 BK |
293 | sdd = container_of((void *)dma, |
294 | struct s3c64xx_spi_driver_data, rx_dma); | |
4969c32b BK |
295 | config.direction = sdd->rx_dma.direction; |
296 | config.fifo = sdd->sfr_start + S3C64XX_SPI_RX_DATA; | |
297 | config.width = sdd->cur_bpw / 8; | |
298 | sdd->ops->config(sdd->rx_dma.ch, &config); | |
299 | } else { | |
82ab8cd7 BK |
300 | sdd = container_of((void *)dma, |
301 | struct s3c64xx_spi_driver_data, tx_dma); | |
4969c32b BK |
302 | config.direction = sdd->tx_dma.direction; |
303 | config.fifo = sdd->sfr_start + S3C64XX_SPI_TX_DATA; | |
304 | config.width = sdd->cur_bpw / 8; | |
305 | sdd->ops->config(sdd->tx_dma.ch, &config); | |
306 | } | |
39d3e807 | 307 | |
82ab8cd7 BK |
308 | info.cap = DMA_SLAVE; |
309 | info.len = len; | |
310 | info.fp = s3c64xx_spi_dmacb; | |
311 | info.fp_param = dma; | |
312 | info.direction = dma->direction; | |
313 | info.buf = buf; | |
314 | ||
315 | sdd->ops->prepare(dma->ch, &info); | |
316 | sdd->ops->trigger(dma->ch); | |
317 | } | |
39d3e807 | 318 | |
82ab8cd7 BK |
319 | static int acquire_dma(struct s3c64xx_spi_driver_data *sdd) |
320 | { | |
4969c32b | 321 | struct samsung_dma_req req; |
82ab8cd7 BK |
322 | |
323 | sdd->ops = samsung_dma_get_ops(); | |
324 | ||
4969c32b BK |
325 | req.cap = DMA_SLAVE; |
326 | req.client = &s3c64xx_spi_dma_client; | |
327 | ||
2b908075 | 328 | req.dt_dmach_prop = sdd->rx_dma.dma_prop; |
4969c32b | 329 | sdd->rx_dma.ch = sdd->ops->request(sdd->rx_dma.dmach, &req); |
2b908075 | 330 | req.dt_dmach_prop = sdd->tx_dma.dma_prop; |
4969c32b | 331 | sdd->tx_dma.ch = sdd->ops->request(sdd->tx_dma.dmach, &req); |
82ab8cd7 BK |
332 | |
333 | return 1; | |
39d3e807 BK |
334 | } |
335 | ||
230d42d4 JB |
336 | static void enable_datapath(struct s3c64xx_spi_driver_data *sdd, |
337 | struct spi_device *spi, | |
338 | struct spi_transfer *xfer, int dma_mode) | |
339 | { | |
230d42d4 JB |
340 | void __iomem *regs = sdd->regs; |
341 | u32 modecfg, chcfg; | |
342 | ||
343 | modecfg = readl(regs + S3C64XX_SPI_MODE_CFG); | |
344 | modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON); | |
345 | ||
346 | chcfg = readl(regs + S3C64XX_SPI_CH_CFG); | |
347 | chcfg &= ~S3C64XX_SPI_CH_TXCH_ON; | |
348 | ||
349 | if (dma_mode) { | |
350 | chcfg &= ~S3C64XX_SPI_CH_RXCH_ON; | |
351 | } else { | |
352 | /* Always shift in data in FIFO, even if xfer is Tx only, | |
353 | * this helps setting PCKT_CNT value for generating clocks | |
354 | * as exactly needed. | |
355 | */ | |
356 | chcfg |= S3C64XX_SPI_CH_RXCH_ON; | |
357 | writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff) | |
358 | | S3C64XX_SPI_PACKET_CNT_EN, | |
359 | regs + S3C64XX_SPI_PACKET_CNT); | |
360 | } | |
361 | ||
362 | if (xfer->tx_buf != NULL) { | |
363 | sdd->state |= TXBUSY; | |
364 | chcfg |= S3C64XX_SPI_CH_TXCH_ON; | |
365 | if (dma_mode) { | |
366 | modecfg |= S3C64XX_SPI_MODE_TXDMA_ON; | |
82ab8cd7 | 367 | prepare_dma(&sdd->tx_dma, xfer->len, xfer->tx_dma); |
230d42d4 | 368 | } else { |
0c92ecf1 JB |
369 | switch (sdd->cur_bpw) { |
370 | case 32: | |
371 | iowrite32_rep(regs + S3C64XX_SPI_TX_DATA, | |
372 | xfer->tx_buf, xfer->len / 4); | |
373 | break; | |
374 | case 16: | |
375 | iowrite16_rep(regs + S3C64XX_SPI_TX_DATA, | |
376 | xfer->tx_buf, xfer->len / 2); | |
377 | break; | |
378 | default: | |
379 | iowrite8_rep(regs + S3C64XX_SPI_TX_DATA, | |
380 | xfer->tx_buf, xfer->len); | |
381 | break; | |
382 | } | |
230d42d4 JB |
383 | } |
384 | } | |
385 | ||
386 | if (xfer->rx_buf != NULL) { | |
387 | sdd->state |= RXBUSY; | |
388 | ||
a5238e36 | 389 | if (sdd->port_conf->high_speed && sdd->cur_speed >= 30000000UL |
230d42d4 JB |
390 | && !(sdd->cur_mode & SPI_CPHA)) |
391 | chcfg |= S3C64XX_SPI_CH_HS_EN; | |
392 | ||
393 | if (dma_mode) { | |
394 | modecfg |= S3C64XX_SPI_MODE_RXDMA_ON; | |
395 | chcfg |= S3C64XX_SPI_CH_RXCH_ON; | |
396 | writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff) | |
397 | | S3C64XX_SPI_PACKET_CNT_EN, | |
398 | regs + S3C64XX_SPI_PACKET_CNT); | |
82ab8cd7 | 399 | prepare_dma(&sdd->rx_dma, xfer->len, xfer->rx_dma); |
230d42d4 JB |
400 | } |
401 | } | |
402 | ||
403 | writel(modecfg, regs + S3C64XX_SPI_MODE_CFG); | |
404 | writel(chcfg, regs + S3C64XX_SPI_CH_CFG); | |
405 | } | |
406 | ||
407 | static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd, | |
408 | struct spi_device *spi) | |
409 | { | |
410 | struct s3c64xx_spi_csinfo *cs; | |
411 | ||
412 | if (sdd->tgl_spi != NULL) { /* If last device toggled after mssg */ | |
413 | if (sdd->tgl_spi != spi) { /* if last mssg on diff device */ | |
414 | /* Deselect the last toggled device */ | |
415 | cs = sdd->tgl_spi->controller_data; | |
1c20c200 TA |
416 | gpio_set_value(cs->line, |
417 | spi->mode & SPI_CS_HIGH ? 0 : 1); | |
230d42d4 JB |
418 | } |
419 | sdd->tgl_spi = NULL; | |
420 | } | |
421 | ||
422 | cs = spi->controller_data; | |
1c20c200 | 423 | gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0); |
230d42d4 JB |
424 | } |
425 | ||
426 | static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd, | |
427 | struct spi_transfer *xfer, int dma_mode) | |
428 | { | |
230d42d4 JB |
429 | void __iomem *regs = sdd->regs; |
430 | unsigned long val; | |
431 | int ms; | |
432 | ||
433 | /* millisecs to xfer 'len' bytes @ 'cur_speed' */ | |
434 | ms = xfer->len * 8 * 1000 / sdd->cur_speed; | |
9d8f86b5 | 435 | ms += 10; /* some tolerance */ |
230d42d4 JB |
436 | |
437 | if (dma_mode) { | |
438 | val = msecs_to_jiffies(ms) + 10; | |
439 | val = wait_for_completion_timeout(&sdd->xfer_completion, val); | |
440 | } else { | |
c3f139b6 | 441 | u32 status; |
230d42d4 JB |
442 | val = msecs_to_loops(ms); |
443 | do { | |
c3f139b6 | 444 | status = readl(regs + S3C64XX_SPI_STATUS); |
a5238e36 | 445 | } while (RX_FIFO_LVL(status, sdd) < xfer->len && --val); |
230d42d4 JB |
446 | } |
447 | ||
448 | if (!val) | |
449 | return -EIO; | |
450 | ||
451 | if (dma_mode) { | |
452 | u32 status; | |
453 | ||
454 | /* | |
455 | * DmaTx returns after simply writing data in the FIFO, | |
456 | * w/o waiting for real transmission on the bus to finish. | |
457 | * DmaRx returns only after Dma read data from FIFO which | |
458 | * needs bus transmission to finish, so we don't worry if | |
459 | * Xfer involved Rx(with or without Tx). | |
460 | */ | |
461 | if (xfer->rx_buf == NULL) { | |
462 | val = msecs_to_loops(10); | |
463 | status = readl(regs + S3C64XX_SPI_STATUS); | |
a5238e36 TA |
464 | while ((TX_FIFO_LVL(status, sdd) |
465 | || !S3C64XX_SPI_ST_TX_DONE(status, sdd)) | |
230d42d4 JB |
466 | && --val) { |
467 | cpu_relax(); | |
468 | status = readl(regs + S3C64XX_SPI_STATUS); | |
469 | } | |
470 | ||
471 | if (!val) | |
472 | return -EIO; | |
473 | } | |
474 | } else { | |
230d42d4 JB |
475 | /* If it was only Tx */ |
476 | if (xfer->rx_buf == NULL) { | |
477 | sdd->state &= ~TXBUSY; | |
478 | return 0; | |
479 | } | |
480 | ||
0c92ecf1 JB |
481 | switch (sdd->cur_bpw) { |
482 | case 32: | |
483 | ioread32_rep(regs + S3C64XX_SPI_RX_DATA, | |
484 | xfer->rx_buf, xfer->len / 4); | |
485 | break; | |
486 | case 16: | |
487 | ioread16_rep(regs + S3C64XX_SPI_RX_DATA, | |
488 | xfer->rx_buf, xfer->len / 2); | |
489 | break; | |
490 | default: | |
491 | ioread8_rep(regs + S3C64XX_SPI_RX_DATA, | |
492 | xfer->rx_buf, xfer->len); | |
493 | break; | |
494 | } | |
230d42d4 JB |
495 | sdd->state &= ~RXBUSY; |
496 | } | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd, | |
502 | struct spi_device *spi) | |
503 | { | |
504 | struct s3c64xx_spi_csinfo *cs = spi->controller_data; | |
505 | ||
506 | if (sdd->tgl_spi == spi) | |
507 | sdd->tgl_spi = NULL; | |
508 | ||
1c20c200 | 509 | gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1); |
230d42d4 JB |
510 | } |
511 | ||
512 | static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd) | |
513 | { | |
230d42d4 JB |
514 | void __iomem *regs = sdd->regs; |
515 | u32 val; | |
516 | ||
517 | /* Disable Clock */ | |
a5238e36 | 518 | if (sdd->port_conf->clk_from_cmu) { |
b42a81ca JB |
519 | clk_disable(sdd->src_clk); |
520 | } else { | |
521 | val = readl(regs + S3C64XX_SPI_CLK_CFG); | |
522 | val &= ~S3C64XX_SPI_ENCLK_ENABLE; | |
523 | writel(val, regs + S3C64XX_SPI_CLK_CFG); | |
524 | } | |
230d42d4 JB |
525 | |
526 | /* Set Polarity and Phase */ | |
527 | val = readl(regs + S3C64XX_SPI_CH_CFG); | |
528 | val &= ~(S3C64XX_SPI_CH_SLAVE | | |
529 | S3C64XX_SPI_CPOL_L | | |
530 | S3C64XX_SPI_CPHA_B); | |
531 | ||
532 | if (sdd->cur_mode & SPI_CPOL) | |
533 | val |= S3C64XX_SPI_CPOL_L; | |
534 | ||
535 | if (sdd->cur_mode & SPI_CPHA) | |
536 | val |= S3C64XX_SPI_CPHA_B; | |
537 | ||
538 | writel(val, regs + S3C64XX_SPI_CH_CFG); | |
539 | ||
540 | /* Set Channel & DMA Mode */ | |
541 | val = readl(regs + S3C64XX_SPI_MODE_CFG); | |
542 | val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK | |
543 | | S3C64XX_SPI_MODE_CH_TSZ_MASK); | |
544 | ||
545 | switch (sdd->cur_bpw) { | |
546 | case 32: | |
547 | val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD; | |
0c92ecf1 | 548 | val |= S3C64XX_SPI_MODE_CH_TSZ_WORD; |
230d42d4 JB |
549 | break; |
550 | case 16: | |
551 | val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD; | |
0c92ecf1 | 552 | val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD; |
230d42d4 JB |
553 | break; |
554 | default: | |
555 | val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE; | |
0c92ecf1 | 556 | val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE; |
230d42d4 JB |
557 | break; |
558 | } | |
230d42d4 JB |
559 | |
560 | writel(val, regs + S3C64XX_SPI_MODE_CFG); | |
561 | ||
a5238e36 | 562 | if (sdd->port_conf->clk_from_cmu) { |
b42a81ca JB |
563 | /* Configure Clock */ |
564 | /* There is half-multiplier before the SPI */ | |
565 | clk_set_rate(sdd->src_clk, sdd->cur_speed * 2); | |
566 | /* Enable Clock */ | |
567 | clk_enable(sdd->src_clk); | |
568 | } else { | |
569 | /* Configure Clock */ | |
570 | val = readl(regs + S3C64XX_SPI_CLK_CFG); | |
571 | val &= ~S3C64XX_SPI_PSR_MASK; | |
572 | val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1) | |
573 | & S3C64XX_SPI_PSR_MASK); | |
574 | writel(val, regs + S3C64XX_SPI_CLK_CFG); | |
575 | ||
576 | /* Enable Clock */ | |
577 | val = readl(regs + S3C64XX_SPI_CLK_CFG); | |
578 | val |= S3C64XX_SPI_ENCLK_ENABLE; | |
579 | writel(val, regs + S3C64XX_SPI_CLK_CFG); | |
580 | } | |
230d42d4 JB |
581 | } |
582 | ||
230d42d4 JB |
583 | #define XFER_DMAADDR_INVALID DMA_BIT_MASK(32) |
584 | ||
585 | static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd, | |
586 | struct spi_message *msg) | |
587 | { | |
588 | struct device *dev = &sdd->pdev->dev; | |
589 | struct spi_transfer *xfer; | |
590 | ||
591 | if (msg->is_dma_mapped) | |
592 | return 0; | |
593 | ||
594 | /* First mark all xfer unmapped */ | |
595 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { | |
596 | xfer->rx_dma = XFER_DMAADDR_INVALID; | |
597 | xfer->tx_dma = XFER_DMAADDR_INVALID; | |
598 | } | |
599 | ||
600 | /* Map until end or first fail */ | |
601 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { | |
602 | ||
a5238e36 | 603 | if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1)) |
e02ddd44 JB |
604 | continue; |
605 | ||
230d42d4 | 606 | if (xfer->tx_buf != NULL) { |
251ee478 JB |
607 | xfer->tx_dma = dma_map_single(dev, |
608 | (void *)xfer->tx_buf, xfer->len, | |
609 | DMA_TO_DEVICE); | |
230d42d4 JB |
610 | if (dma_mapping_error(dev, xfer->tx_dma)) { |
611 | dev_err(dev, "dma_map_single Tx failed\n"); | |
612 | xfer->tx_dma = XFER_DMAADDR_INVALID; | |
613 | return -ENOMEM; | |
614 | } | |
615 | } | |
616 | ||
617 | if (xfer->rx_buf != NULL) { | |
618 | xfer->rx_dma = dma_map_single(dev, xfer->rx_buf, | |
619 | xfer->len, DMA_FROM_DEVICE); | |
620 | if (dma_mapping_error(dev, xfer->rx_dma)) { | |
621 | dev_err(dev, "dma_map_single Rx failed\n"); | |
622 | dma_unmap_single(dev, xfer->tx_dma, | |
623 | xfer->len, DMA_TO_DEVICE); | |
624 | xfer->tx_dma = XFER_DMAADDR_INVALID; | |
625 | xfer->rx_dma = XFER_DMAADDR_INVALID; | |
626 | return -ENOMEM; | |
627 | } | |
628 | } | |
629 | } | |
630 | ||
631 | return 0; | |
632 | } | |
633 | ||
634 | static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd, | |
635 | struct spi_message *msg) | |
636 | { | |
637 | struct device *dev = &sdd->pdev->dev; | |
638 | struct spi_transfer *xfer; | |
639 | ||
640 | if (msg->is_dma_mapped) | |
641 | return; | |
642 | ||
643 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { | |
644 | ||
a5238e36 | 645 | if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1)) |
e02ddd44 JB |
646 | continue; |
647 | ||
230d42d4 JB |
648 | if (xfer->rx_buf != NULL |
649 | && xfer->rx_dma != XFER_DMAADDR_INVALID) | |
650 | dma_unmap_single(dev, xfer->rx_dma, | |
651 | xfer->len, DMA_FROM_DEVICE); | |
652 | ||
653 | if (xfer->tx_buf != NULL | |
654 | && xfer->tx_dma != XFER_DMAADDR_INVALID) | |
655 | dma_unmap_single(dev, xfer->tx_dma, | |
656 | xfer->len, DMA_TO_DEVICE); | |
657 | } | |
658 | } | |
659 | ||
ad2a99af MB |
660 | static int s3c64xx_spi_transfer_one_message(struct spi_master *master, |
661 | struct spi_message *msg) | |
230d42d4 | 662 | { |
ad2a99af | 663 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); |
230d42d4 JB |
664 | struct spi_device *spi = msg->spi; |
665 | struct s3c64xx_spi_csinfo *cs = spi->controller_data; | |
666 | struct spi_transfer *xfer; | |
667 | int status = 0, cs_toggle = 0; | |
668 | u32 speed; | |
669 | u8 bpw; | |
670 | ||
671 | /* If Master's(controller) state differs from that needed by Slave */ | |
672 | if (sdd->cur_speed != spi->max_speed_hz | |
673 | || sdd->cur_mode != spi->mode | |
674 | || sdd->cur_bpw != spi->bits_per_word) { | |
675 | sdd->cur_bpw = spi->bits_per_word; | |
676 | sdd->cur_speed = spi->max_speed_hz; | |
677 | sdd->cur_mode = spi->mode; | |
678 | s3c64xx_spi_config(sdd); | |
679 | } | |
680 | ||
681 | /* Map all the transfers if needed */ | |
682 | if (s3c64xx_spi_map_mssg(sdd, msg)) { | |
683 | dev_err(&spi->dev, | |
684 | "Xfer: Unable to map message buffers!\n"); | |
685 | status = -ENOMEM; | |
686 | goto out; | |
687 | } | |
688 | ||
689 | /* Configure feedback delay */ | |
690 | writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK); | |
691 | ||
692 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { | |
693 | ||
694 | unsigned long flags; | |
695 | int use_dma; | |
696 | ||
697 | INIT_COMPLETION(sdd->xfer_completion); | |
698 | ||
699 | /* Only BPW and Speed may change across transfers */ | |
700 | bpw = xfer->bits_per_word ? : spi->bits_per_word; | |
701 | speed = xfer->speed_hz ? : spi->max_speed_hz; | |
702 | ||
0c92ecf1 JB |
703 | if (xfer->len % (bpw / 8)) { |
704 | dev_err(&spi->dev, | |
705 | "Xfer length(%u) not a multiple of word size(%u)\n", | |
706 | xfer->len, bpw / 8); | |
707 | status = -EIO; | |
708 | goto out; | |
709 | } | |
710 | ||
230d42d4 JB |
711 | if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) { |
712 | sdd->cur_bpw = bpw; | |
713 | sdd->cur_speed = speed; | |
714 | s3c64xx_spi_config(sdd); | |
715 | } | |
716 | ||
717 | /* Polling method for xfers not bigger than FIFO capacity */ | |
a5238e36 | 718 | if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1)) |
230d42d4 JB |
719 | use_dma = 0; |
720 | else | |
721 | use_dma = 1; | |
722 | ||
723 | spin_lock_irqsave(&sdd->lock, flags); | |
724 | ||
725 | /* Pending only which is to be done */ | |
726 | sdd->state &= ~RXBUSY; | |
727 | sdd->state &= ~TXBUSY; | |
728 | ||
729 | enable_datapath(sdd, spi, xfer, use_dma); | |
730 | ||
731 | /* Slave Select */ | |
732 | enable_cs(sdd, spi); | |
733 | ||
734 | /* Start the signals */ | |
5fc3e831 | 735 | writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL); |
230d42d4 JB |
736 | |
737 | spin_unlock_irqrestore(&sdd->lock, flags); | |
738 | ||
739 | status = wait_for_xfer(sdd, xfer, use_dma); | |
740 | ||
741 | /* Quiese the signals */ | |
5fc3e831 MB |
742 | writel(S3C64XX_SPI_SLAVE_SIG_INACT, |
743 | sdd->regs + S3C64XX_SPI_SLAVE_SEL); | |
230d42d4 JB |
744 | |
745 | if (status) { | |
8a349d4b JP |
746 | dev_err(&spi->dev, "I/O Error: " |
747 | "rx-%d tx-%d res:rx-%c tx-%c len-%d\n", | |
230d42d4 JB |
748 | xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0, |
749 | (sdd->state & RXBUSY) ? 'f' : 'p', | |
750 | (sdd->state & TXBUSY) ? 'f' : 'p', | |
751 | xfer->len); | |
752 | ||
753 | if (use_dma) { | |
754 | if (xfer->tx_buf != NULL | |
755 | && (sdd->state & TXBUSY)) | |
82ab8cd7 | 756 | sdd->ops->stop(sdd->tx_dma.ch); |
230d42d4 JB |
757 | if (xfer->rx_buf != NULL |
758 | && (sdd->state & RXBUSY)) | |
82ab8cd7 | 759 | sdd->ops->stop(sdd->rx_dma.ch); |
230d42d4 JB |
760 | } |
761 | ||
762 | goto out; | |
763 | } | |
764 | ||
765 | if (xfer->delay_usecs) | |
766 | udelay(xfer->delay_usecs); | |
767 | ||
768 | if (xfer->cs_change) { | |
769 | /* Hint that the next mssg is gonna be | |
770 | for the same device */ | |
771 | if (list_is_last(&xfer->transfer_list, | |
772 | &msg->transfers)) | |
773 | cs_toggle = 1; | |
774 | else | |
775 | disable_cs(sdd, spi); | |
776 | } | |
777 | ||
778 | msg->actual_length += xfer->len; | |
779 | ||
780 | flush_fifo(sdd); | |
781 | } | |
782 | ||
783 | out: | |
784 | if (!cs_toggle || status) | |
785 | disable_cs(sdd, spi); | |
786 | else | |
787 | sdd->tgl_spi = spi; | |
788 | ||
789 | s3c64xx_spi_unmap_mssg(sdd, msg); | |
790 | ||
791 | msg->status = status; | |
792 | ||
ad2a99af MB |
793 | spi_finalize_current_message(master); |
794 | ||
795 | return 0; | |
230d42d4 JB |
796 | } |
797 | ||
ad2a99af | 798 | static int s3c64xx_spi_prepare_transfer(struct spi_master *spi) |
230d42d4 | 799 | { |
ad2a99af | 800 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); |
230d42d4 JB |
801 | |
802 | /* Acquire DMA channels */ | |
803 | while (!acquire_dma(sdd)) | |
804 | msleep(10); | |
805 | ||
b97b6621 MB |
806 | pm_runtime_get_sync(&sdd->pdev->dev); |
807 | ||
ad2a99af MB |
808 | return 0; |
809 | } | |
230d42d4 | 810 | |
ad2a99af MB |
811 | static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi) |
812 | { | |
813 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); | |
230d42d4 JB |
814 | |
815 | /* Free DMA channels */ | |
82ab8cd7 BK |
816 | sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client); |
817 | sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client); | |
b97b6621 MB |
818 | |
819 | pm_runtime_put(&sdd->pdev->dev); | |
230d42d4 JB |
820 | |
821 | return 0; | |
822 | } | |
823 | ||
2b908075 TA |
824 | static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata( |
825 | struct s3c64xx_spi_driver_data *sdd, | |
826 | struct spi_device *spi) | |
827 | { | |
828 | struct s3c64xx_spi_csinfo *cs; | |
4732cc63 | 829 | struct device_node *slave_np, *data_np = NULL; |
2b908075 TA |
830 | u32 fb_delay = 0; |
831 | ||
832 | slave_np = spi->dev.of_node; | |
833 | if (!slave_np) { | |
834 | dev_err(&spi->dev, "device node not found\n"); | |
835 | return ERR_PTR(-EINVAL); | |
836 | } | |
837 | ||
838 | for_each_child_of_node(slave_np, data_np) | |
839 | if (!strcmp(data_np->name, "controller-data")) | |
840 | break; | |
841 | if (!data_np) { | |
842 | dev_err(&spi->dev, "child node 'controller-data' not found\n"); | |
843 | return ERR_PTR(-EINVAL); | |
844 | } | |
845 | ||
846 | cs = kzalloc(sizeof(*cs), GFP_KERNEL); | |
847 | if (!cs) { | |
848 | dev_err(&spi->dev, "could not allocate memory for controller" | |
849 | " data\n"); | |
850 | return ERR_PTR(-ENOMEM); | |
851 | } | |
852 | ||
853 | cs->line = of_get_named_gpio(data_np, "cs-gpio", 0); | |
854 | if (!gpio_is_valid(cs->line)) { | |
855 | dev_err(&spi->dev, "chip select gpio is not specified or " | |
856 | "invalid\n"); | |
857 | kfree(cs); | |
858 | return ERR_PTR(-EINVAL); | |
859 | } | |
860 | ||
861 | of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay); | |
862 | cs->fb_delay = fb_delay; | |
863 | return cs; | |
864 | } | |
865 | ||
230d42d4 JB |
866 | /* |
867 | * Here we only check the validity of requested configuration | |
868 | * and save the configuration in a local data-structure. | |
869 | * The controller is actually configured only just before we | |
870 | * get a message to transfer. | |
871 | */ | |
872 | static int s3c64xx_spi_setup(struct spi_device *spi) | |
873 | { | |
874 | struct s3c64xx_spi_csinfo *cs = spi->controller_data; | |
875 | struct s3c64xx_spi_driver_data *sdd; | |
ad7de729 | 876 | struct s3c64xx_spi_info *sci; |
230d42d4 | 877 | struct spi_message *msg; |
230d42d4 | 878 | unsigned long flags; |
2b908075 | 879 | int err; |
230d42d4 | 880 | |
2b908075 TA |
881 | sdd = spi_master_get_devdata(spi->master); |
882 | if (!cs && spi->dev.of_node) { | |
883 | cs = s3c64xx_get_slave_ctrldata(sdd, spi); | |
884 | spi->controller_data = cs; | |
885 | } | |
886 | ||
887 | if (IS_ERR_OR_NULL(cs)) { | |
230d42d4 JB |
888 | dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select); |
889 | return -ENODEV; | |
890 | } | |
891 | ||
1c20c200 | 892 | if (!spi_get_ctldata(spi)) { |
707214d0 MB |
893 | err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH, |
894 | dev_name(&spi->dev)); | |
1c20c200 | 895 | if (err) { |
49f3eacf MB |
896 | dev_err(&spi->dev, |
897 | "Failed to get /CS gpio [%d]: %d\n", | |
898 | cs->line, err); | |
2b908075 | 899 | goto err_gpio_req; |
1c20c200 TA |
900 | } |
901 | spi_set_ctldata(spi, cs); | |
902 | } | |
903 | ||
230d42d4 JB |
904 | sci = sdd->cntrlr_info; |
905 | ||
906 | spin_lock_irqsave(&sdd->lock, flags); | |
907 | ||
908 | list_for_each_entry(msg, &sdd->queue, queue) { | |
909 | /* Is some mssg is already queued for this device */ | |
910 | if (msg->spi == spi) { | |
911 | dev_err(&spi->dev, | |
912 | "setup: attempt while mssg in queue!\n"); | |
913 | spin_unlock_irqrestore(&sdd->lock, flags); | |
2b908075 TA |
914 | err = -EBUSY; |
915 | goto err_msgq; | |
230d42d4 JB |
916 | } |
917 | } | |
918 | ||
230d42d4 JB |
919 | spin_unlock_irqrestore(&sdd->lock, flags); |
920 | ||
921 | if (spi->bits_per_word != 8 | |
922 | && spi->bits_per_word != 16 | |
923 | && spi->bits_per_word != 32) { | |
924 | dev_err(&spi->dev, "setup: %dbits/wrd not supported!\n", | |
925 | spi->bits_per_word); | |
926 | err = -EINVAL; | |
927 | goto setup_exit; | |
928 | } | |
929 | ||
b97b6621 MB |
930 | pm_runtime_get_sync(&sdd->pdev->dev); |
931 | ||
230d42d4 | 932 | /* Check if we can provide the requested rate */ |
a5238e36 | 933 | if (!sdd->port_conf->clk_from_cmu) { |
b42a81ca JB |
934 | u32 psr, speed; |
935 | ||
936 | /* Max possible */ | |
937 | speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1); | |
938 | ||
939 | if (spi->max_speed_hz > speed) | |
940 | spi->max_speed_hz = speed; | |
941 | ||
942 | psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1; | |
943 | psr &= S3C64XX_SPI_PSR_MASK; | |
944 | if (psr == S3C64XX_SPI_PSR_MASK) | |
945 | psr--; | |
946 | ||
947 | speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1); | |
948 | if (spi->max_speed_hz < speed) { | |
949 | if (psr+1 < S3C64XX_SPI_PSR_MASK) { | |
950 | psr++; | |
951 | } else { | |
952 | err = -EINVAL; | |
953 | goto setup_exit; | |
954 | } | |
955 | } | |
230d42d4 | 956 | |
b42a81ca | 957 | speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1); |
2b908075 | 958 | if (spi->max_speed_hz >= speed) { |
b42a81ca | 959 | spi->max_speed_hz = speed; |
2b908075 | 960 | } else { |
230d42d4 | 961 | err = -EINVAL; |
2b908075 TA |
962 | goto setup_exit; |
963 | } | |
230d42d4 JB |
964 | } |
965 | ||
b97b6621 | 966 | pm_runtime_put(&sdd->pdev->dev); |
2b908075 TA |
967 | disable_cs(sdd, spi); |
968 | return 0; | |
b97b6621 | 969 | |
230d42d4 | 970 | setup_exit: |
230d42d4 JB |
971 | /* setup() returns with device de-selected */ |
972 | disable_cs(sdd, spi); | |
973 | ||
2b908075 TA |
974 | err_msgq: |
975 | gpio_free(cs->line); | |
976 | spi_set_ctldata(spi, NULL); | |
977 | ||
978 | err_gpio_req: | |
979 | kfree(cs); | |
980 | ||
230d42d4 JB |
981 | return err; |
982 | } | |
983 | ||
1c20c200 TA |
984 | static void s3c64xx_spi_cleanup(struct spi_device *spi) |
985 | { | |
986 | struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi); | |
987 | ||
2b908075 | 988 | if (cs) { |
1c20c200 | 989 | gpio_free(cs->line); |
2b908075 TA |
990 | if (spi->dev.of_node) |
991 | kfree(cs); | |
992 | } | |
1c20c200 TA |
993 | spi_set_ctldata(spi, NULL); |
994 | } | |
995 | ||
c2573128 MB |
996 | static irqreturn_t s3c64xx_spi_irq(int irq, void *data) |
997 | { | |
998 | struct s3c64xx_spi_driver_data *sdd = data; | |
999 | struct spi_master *spi = sdd->master; | |
1000 | unsigned int val; | |
1001 | ||
1002 | val = readl(sdd->regs + S3C64XX_SPI_PENDING_CLR); | |
1003 | ||
1004 | val &= S3C64XX_SPI_PND_RX_OVERRUN_CLR | | |
1005 | S3C64XX_SPI_PND_RX_UNDERRUN_CLR | | |
1006 | S3C64XX_SPI_PND_TX_OVERRUN_CLR | | |
1007 | S3C64XX_SPI_PND_TX_UNDERRUN_CLR; | |
1008 | ||
1009 | writel(val, sdd->regs + S3C64XX_SPI_PENDING_CLR); | |
1010 | ||
1011 | if (val & S3C64XX_SPI_PND_RX_OVERRUN_CLR) | |
1012 | dev_err(&spi->dev, "RX overrun\n"); | |
1013 | if (val & S3C64XX_SPI_PND_RX_UNDERRUN_CLR) | |
1014 | dev_err(&spi->dev, "RX underrun\n"); | |
1015 | if (val & S3C64XX_SPI_PND_TX_OVERRUN_CLR) | |
1016 | dev_err(&spi->dev, "TX overrun\n"); | |
1017 | if (val & S3C64XX_SPI_PND_TX_UNDERRUN_CLR) | |
1018 | dev_err(&spi->dev, "TX underrun\n"); | |
1019 | ||
1020 | return IRQ_HANDLED; | |
1021 | } | |
1022 | ||
230d42d4 JB |
1023 | static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel) |
1024 | { | |
ad7de729 | 1025 | struct s3c64xx_spi_info *sci = sdd->cntrlr_info; |
230d42d4 JB |
1026 | void __iomem *regs = sdd->regs; |
1027 | unsigned int val; | |
1028 | ||
1029 | sdd->cur_speed = 0; | |
1030 | ||
5fc3e831 | 1031 | writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL); |
230d42d4 JB |
1032 | |
1033 | /* Disable Interrupts - we use Polling if not DMA mode */ | |
1034 | writel(0, regs + S3C64XX_SPI_INT_EN); | |
1035 | ||
a5238e36 | 1036 | if (!sdd->port_conf->clk_from_cmu) |
b42a81ca | 1037 | writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT, |
230d42d4 JB |
1038 | regs + S3C64XX_SPI_CLK_CFG); |
1039 | writel(0, regs + S3C64XX_SPI_MODE_CFG); | |
1040 | writel(0, regs + S3C64XX_SPI_PACKET_CNT); | |
1041 | ||
1042 | /* Clear any irq pending bits */ | |
1043 | writel(readl(regs + S3C64XX_SPI_PENDING_CLR), | |
1044 | regs + S3C64XX_SPI_PENDING_CLR); | |
1045 | ||
1046 | writel(0, regs + S3C64XX_SPI_SWAP_CFG); | |
1047 | ||
1048 | val = readl(regs + S3C64XX_SPI_MODE_CFG); | |
1049 | val &= ~S3C64XX_SPI_MODE_4BURST; | |
1050 | val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF); | |
1051 | val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF); | |
1052 | writel(val, regs + S3C64XX_SPI_MODE_CFG); | |
1053 | ||
1054 | flush_fifo(sdd); | |
1055 | } | |
1056 | ||
2b908075 TA |
1057 | static int __devinit s3c64xx_spi_get_dmares( |
1058 | struct s3c64xx_spi_driver_data *sdd, bool tx) | |
1059 | { | |
1060 | struct platform_device *pdev = sdd->pdev; | |
1061 | struct s3c64xx_spi_dma_data *dma_data; | |
1062 | struct property *prop; | |
1063 | struct resource *res; | |
1064 | char prop_name[15], *chan_str; | |
1065 | ||
1066 | if (tx) { | |
1067 | dma_data = &sdd->tx_dma; | |
1068 | dma_data->direction = DMA_TO_DEVICE; | |
1069 | chan_str = "tx"; | |
1070 | } else { | |
1071 | dma_data = &sdd->rx_dma; | |
1072 | dma_data->direction = DMA_FROM_DEVICE; | |
1073 | chan_str = "rx"; | |
1074 | } | |
1075 | ||
1076 | if (!sdd->pdev->dev.of_node) { | |
1077 | res = platform_get_resource(pdev, IORESOURCE_DMA, tx ? 0 : 1); | |
1078 | if (!res) { | |
1079 | dev_err(&pdev->dev, "Unable to get SPI-%s dma " | |
1080 | "resource\n", chan_str); | |
1081 | return -ENXIO; | |
1082 | } | |
1083 | dma_data->dmach = res->start; | |
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | sprintf(prop_name, "%s-dma-channel", chan_str); | |
1088 | prop = of_find_property(pdev->dev.of_node, prop_name, NULL); | |
1089 | if (!prop) { | |
1090 | dev_err(&pdev->dev, "%s dma channel property not specified\n", | |
1091 | chan_str); | |
1092 | return -ENXIO; | |
1093 | } | |
1094 | ||
1095 | dma_data->dmach = DMACH_DT_PROP; | |
1096 | dma_data->dma_prop = prop; | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | #ifdef CONFIG_OF | |
1101 | static int s3c64xx_spi_parse_dt_gpio(struct s3c64xx_spi_driver_data *sdd) | |
1102 | { | |
1103 | struct device *dev = &sdd->pdev->dev; | |
1104 | int idx, gpio, ret; | |
1105 | ||
1106 | /* find gpios for mosi, miso and clock lines */ | |
1107 | for (idx = 0; idx < 3; idx++) { | |
1108 | gpio = of_get_gpio(dev->of_node, idx); | |
1109 | if (!gpio_is_valid(gpio)) { | |
1110 | dev_err(dev, "invalid gpio[%d]: %d\n", idx, gpio); | |
1111 | goto free_gpio; | |
1112 | } | |
1113 | ||
1114 | ret = gpio_request(gpio, "spi-bus"); | |
1115 | if (ret) { | |
49f3eacf MB |
1116 | dev_err(dev, "gpio [%d] request failed: %d\n", |
1117 | gpio, ret); | |
2b908075 TA |
1118 | goto free_gpio; |
1119 | } | |
1120 | } | |
1121 | return 0; | |
1122 | ||
1123 | free_gpio: | |
1124 | while (--idx >= 0) | |
1125 | gpio_free(sdd->gpios[idx]); | |
1126 | return -EINVAL; | |
1127 | } | |
1128 | ||
1129 | static void s3c64xx_spi_dt_gpio_free(struct s3c64xx_spi_driver_data *sdd) | |
1130 | { | |
1131 | unsigned int idx; | |
1132 | for (idx = 0; idx < 3; idx++) | |
1133 | gpio_free(sdd->gpios[idx]); | |
1134 | } | |
1135 | ||
1136 | static struct __devinit s3c64xx_spi_info * s3c64xx_spi_parse_dt( | |
1137 | struct device *dev) | |
1138 | { | |
1139 | struct s3c64xx_spi_info *sci; | |
1140 | u32 temp; | |
1141 | ||
1142 | sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL); | |
1143 | if (!sci) { | |
1144 | dev_err(dev, "memory allocation for spi_info failed\n"); | |
1145 | return ERR_PTR(-ENOMEM); | |
1146 | } | |
1147 | ||
1148 | if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) { | |
1149 | dev_warn(dev, "spi bus clock parent not specified, using " | |
1150 | "clock at index 0 as parent\n"); | |
1151 | sci->src_clk_nr = 0; | |
1152 | } else { | |
1153 | sci->src_clk_nr = temp; | |
1154 | } | |
1155 | ||
1156 | if (of_property_read_u32(dev->of_node, "num-cs", &temp)) { | |
1157 | dev_warn(dev, "number of chip select lines not specified, " | |
1158 | "assuming 1 chip select line\n"); | |
1159 | sci->num_cs = 1; | |
1160 | } else { | |
1161 | sci->num_cs = temp; | |
1162 | } | |
1163 | ||
1164 | return sci; | |
1165 | } | |
1166 | #else | |
1167 | static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) | |
1168 | { | |
1169 | return dev->platform_data; | |
1170 | } | |
1171 | ||
1172 | static int s3c64xx_spi_parse_dt_gpio(struct s3c64xx_spi_driver_data *sdd) | |
1173 | { | |
1174 | return -EINVAL; | |
1175 | } | |
1176 | ||
1177 | static void s3c64xx_spi_dt_gpio_free(struct s3c64xx_spi_driver_data *sdd) | |
1178 | { | |
1179 | } | |
1180 | #endif | |
1181 | ||
1182 | static const struct of_device_id s3c64xx_spi_dt_match[]; | |
1183 | ||
a5238e36 TA |
1184 | static inline struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config( |
1185 | struct platform_device *pdev) | |
1186 | { | |
2b908075 TA |
1187 | #ifdef CONFIG_OF |
1188 | if (pdev->dev.of_node) { | |
1189 | const struct of_device_id *match; | |
1190 | match = of_match_node(s3c64xx_spi_dt_match, pdev->dev.of_node); | |
1191 | return (struct s3c64xx_spi_port_config *)match->data; | |
1192 | } | |
1193 | #endif | |
a5238e36 TA |
1194 | return (struct s3c64xx_spi_port_config *) |
1195 | platform_get_device_id(pdev)->driver_data; | |
1196 | } | |
1197 | ||
230d42d4 JB |
1198 | static int __init s3c64xx_spi_probe(struct platform_device *pdev) |
1199 | { | |
2b908075 | 1200 | struct resource *mem_res; |
230d42d4 | 1201 | struct s3c64xx_spi_driver_data *sdd; |
2b908075 | 1202 | struct s3c64xx_spi_info *sci = pdev->dev.platform_data; |
230d42d4 | 1203 | struct spi_master *master; |
c2573128 | 1204 | int ret, irq; |
a24d850b | 1205 | char clk_name[16]; |
230d42d4 | 1206 | |
2b908075 TA |
1207 | if (!sci && pdev->dev.of_node) { |
1208 | sci = s3c64xx_spi_parse_dt(&pdev->dev); | |
1209 | if (IS_ERR(sci)) | |
1210 | return PTR_ERR(sci); | |
230d42d4 JB |
1211 | } |
1212 | ||
2b908075 | 1213 | if (!sci) { |
230d42d4 JB |
1214 | dev_err(&pdev->dev, "platform_data missing!\n"); |
1215 | return -ENODEV; | |
1216 | } | |
1217 | ||
230d42d4 JB |
1218 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
1219 | if (mem_res == NULL) { | |
1220 | dev_err(&pdev->dev, "Unable to get SPI MEM resource\n"); | |
1221 | return -ENXIO; | |
1222 | } | |
1223 | ||
c2573128 MB |
1224 | irq = platform_get_irq(pdev, 0); |
1225 | if (irq < 0) { | |
1226 | dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq); | |
1227 | return irq; | |
1228 | } | |
1229 | ||
230d42d4 JB |
1230 | master = spi_alloc_master(&pdev->dev, |
1231 | sizeof(struct s3c64xx_spi_driver_data)); | |
1232 | if (master == NULL) { | |
1233 | dev_err(&pdev->dev, "Unable to allocate SPI Master\n"); | |
1234 | return -ENOMEM; | |
1235 | } | |
1236 | ||
230d42d4 JB |
1237 | platform_set_drvdata(pdev, master); |
1238 | ||
1239 | sdd = spi_master_get_devdata(master); | |
a5238e36 | 1240 | sdd->port_conf = s3c64xx_spi_get_port_config(pdev); |
230d42d4 JB |
1241 | sdd->master = master; |
1242 | sdd->cntrlr_info = sci; | |
1243 | sdd->pdev = pdev; | |
1244 | sdd->sfr_start = mem_res->start; | |
2b908075 TA |
1245 | if (pdev->dev.of_node) { |
1246 | ret = of_alias_get_id(pdev->dev.of_node, "spi"); | |
1247 | if (ret < 0) { | |
1248 | dev_err(&pdev->dev, "failed to get alias id, " | |
1249 | "errno %d\n", ret); | |
1250 | goto err0; | |
1251 | } | |
1252 | sdd->port_id = ret; | |
1253 | } else { | |
1254 | sdd->port_id = pdev->id; | |
1255 | } | |
230d42d4 JB |
1256 | |
1257 | sdd->cur_bpw = 8; | |
1258 | ||
2b908075 TA |
1259 | ret = s3c64xx_spi_get_dmares(sdd, true); |
1260 | if (ret) | |
1261 | goto err0; | |
1262 | ||
1263 | ret = s3c64xx_spi_get_dmares(sdd, false); | |
1264 | if (ret) | |
1265 | goto err0; | |
1266 | ||
1267 | master->dev.of_node = pdev->dev.of_node; | |
a5238e36 | 1268 | master->bus_num = sdd->port_id; |
230d42d4 | 1269 | master->setup = s3c64xx_spi_setup; |
1c20c200 | 1270 | master->cleanup = s3c64xx_spi_cleanup; |
ad2a99af MB |
1271 | master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer; |
1272 | master->transfer_one_message = s3c64xx_spi_transfer_one_message; | |
1273 | master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer; | |
230d42d4 JB |
1274 | master->num_chipselect = sci->num_cs; |
1275 | master->dma_alignment = 8; | |
1276 | /* the spi->mode bits understood by this driver: */ | |
1277 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; | |
1278 | ||
b1ec4308 | 1279 | sdd->regs = devm_request_and_ioremap(&pdev->dev, mem_res); |
230d42d4 JB |
1280 | if (sdd->regs == NULL) { |
1281 | dev_err(&pdev->dev, "Unable to remap IO\n"); | |
1282 | ret = -ENXIO; | |
1283 | goto err1; | |
1284 | } | |
1285 | ||
2b908075 TA |
1286 | if (!sci->cfg_gpio && pdev->dev.of_node) { |
1287 | if (s3c64xx_spi_parse_dt_gpio(sdd)) | |
1288 | return -EBUSY; | |
1289 | } else if (sci->cfg_gpio == NULL || sci->cfg_gpio()) { | |
230d42d4 JB |
1290 | dev_err(&pdev->dev, "Unable to config gpio\n"); |
1291 | ret = -EBUSY; | |
1292 | goto err2; | |
1293 | } | |
1294 | ||
1295 | /* Setup clocks */ | |
1296 | sdd->clk = clk_get(&pdev->dev, "spi"); | |
1297 | if (IS_ERR(sdd->clk)) { | |
1298 | dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n"); | |
1299 | ret = PTR_ERR(sdd->clk); | |
1300 | goto err3; | |
1301 | } | |
1302 | ||
1303 | if (clk_enable(sdd->clk)) { | |
1304 | dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n"); | |
1305 | ret = -EBUSY; | |
1306 | goto err4; | |
1307 | } | |
1308 | ||
a24d850b PV |
1309 | sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr); |
1310 | sdd->src_clk = clk_get(&pdev->dev, clk_name); | |
b0d5d6e5 | 1311 | if (IS_ERR(sdd->src_clk)) { |
230d42d4 | 1312 | dev_err(&pdev->dev, |
a24d850b | 1313 | "Unable to acquire clock '%s'\n", clk_name); |
b0d5d6e5 | 1314 | ret = PTR_ERR(sdd->src_clk); |
230d42d4 JB |
1315 | goto err5; |
1316 | } | |
1317 | ||
b0d5d6e5 | 1318 | if (clk_enable(sdd->src_clk)) { |
a24d850b | 1319 | dev_err(&pdev->dev, "Couldn't enable clock '%s'\n", clk_name); |
230d42d4 JB |
1320 | ret = -EBUSY; |
1321 | goto err6; | |
1322 | } | |
1323 | ||
230d42d4 | 1324 | /* Setup Deufult Mode */ |
a5238e36 | 1325 | s3c64xx_spi_hwinit(sdd, sdd->port_id); |
230d42d4 JB |
1326 | |
1327 | spin_lock_init(&sdd->lock); | |
1328 | init_completion(&sdd->xfer_completion); | |
230d42d4 JB |
1329 | INIT_LIST_HEAD(&sdd->queue); |
1330 | ||
c2573128 MB |
1331 | ret = request_irq(irq, s3c64xx_spi_irq, 0, "spi-s3c64xx", sdd); |
1332 | if (ret != 0) { | |
1333 | dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n", | |
1334 | irq, ret); | |
ad2a99af | 1335 | goto err7; |
c2573128 MB |
1336 | } |
1337 | ||
1338 | writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN | | |
1339 | S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN, | |
1340 | sdd->regs + S3C64XX_SPI_INT_EN); | |
1341 | ||
230d42d4 JB |
1342 | if (spi_register_master(master)) { |
1343 | dev_err(&pdev->dev, "cannot register SPI master\n"); | |
1344 | ret = -EBUSY; | |
ad2a99af | 1345 | goto err8; |
230d42d4 JB |
1346 | } |
1347 | ||
8a349d4b JP |
1348 | dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d " |
1349 | "with %d Slaves attached\n", | |
a5238e36 | 1350 | sdd->port_id, master->num_chipselect); |
8a349d4b | 1351 | dev_dbg(&pdev->dev, "\tIOmem=[0x%x-0x%x]\tDMA=[Rx-%d, Tx-%d]\n", |
230d42d4 | 1352 | mem_res->end, mem_res->start, |
82ab8cd7 | 1353 | sdd->rx_dma.dmach, sdd->tx_dma.dmach); |
230d42d4 | 1354 | |
b97b6621 MB |
1355 | pm_runtime_enable(&pdev->dev); |
1356 | ||
230d42d4 JB |
1357 | return 0; |
1358 | ||
1359 | err8: | |
ad2a99af | 1360 | free_irq(irq, sdd); |
230d42d4 | 1361 | err7: |
b0d5d6e5 | 1362 | clk_disable(sdd->src_clk); |
230d42d4 | 1363 | err6: |
b0d5d6e5 | 1364 | clk_put(sdd->src_clk); |
230d42d4 JB |
1365 | err5: |
1366 | clk_disable(sdd->clk); | |
1367 | err4: | |
1368 | clk_put(sdd->clk); | |
1369 | err3: | |
2b908075 TA |
1370 | if (!sdd->cntrlr_info->cfg_gpio && pdev->dev.of_node) |
1371 | s3c64xx_spi_dt_gpio_free(sdd); | |
230d42d4 | 1372 | err2: |
230d42d4 | 1373 | err1: |
230d42d4 JB |
1374 | err0: |
1375 | platform_set_drvdata(pdev, NULL); | |
1376 | spi_master_put(master); | |
1377 | ||
1378 | return ret; | |
1379 | } | |
1380 | ||
1381 | static int s3c64xx_spi_remove(struct platform_device *pdev) | |
1382 | { | |
1383 | struct spi_master *master = spi_master_get(platform_get_drvdata(pdev)); | |
1384 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); | |
230d42d4 | 1385 | |
b97b6621 MB |
1386 | pm_runtime_disable(&pdev->dev); |
1387 | ||
230d42d4 JB |
1388 | spi_unregister_master(master); |
1389 | ||
c2573128 MB |
1390 | writel(0, sdd->regs + S3C64XX_SPI_INT_EN); |
1391 | ||
1392 | free_irq(platform_get_irq(pdev, 0), sdd); | |
1393 | ||
b0d5d6e5 JB |
1394 | clk_disable(sdd->src_clk); |
1395 | clk_put(sdd->src_clk); | |
230d42d4 JB |
1396 | |
1397 | clk_disable(sdd->clk); | |
1398 | clk_put(sdd->clk); | |
1399 | ||
2b908075 TA |
1400 | if (!sdd->cntrlr_info->cfg_gpio && pdev->dev.of_node) |
1401 | s3c64xx_spi_dt_gpio_free(sdd); | |
1402 | ||
230d42d4 JB |
1403 | platform_set_drvdata(pdev, NULL); |
1404 | spi_master_put(master); | |
1405 | ||
1406 | return 0; | |
1407 | } | |
1408 | ||
1409 | #ifdef CONFIG_PM | |
e25d0bf9 | 1410 | static int s3c64xx_spi_suspend(struct device *dev) |
230d42d4 | 1411 | { |
e25d0bf9 | 1412 | struct spi_master *master = spi_master_get(dev_get_drvdata(dev)); |
230d42d4 | 1413 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); |
230d42d4 | 1414 | |
ad2a99af | 1415 | spi_master_suspend(master); |
230d42d4 JB |
1416 | |
1417 | /* Disable the clock */ | |
b0d5d6e5 | 1418 | clk_disable(sdd->src_clk); |
230d42d4 JB |
1419 | clk_disable(sdd->clk); |
1420 | ||
2b908075 TA |
1421 | if (!sdd->cntrlr_info->cfg_gpio && dev->of_node) |
1422 | s3c64xx_spi_dt_gpio_free(sdd); | |
1423 | ||
230d42d4 JB |
1424 | sdd->cur_speed = 0; /* Output Clock is stopped */ |
1425 | ||
1426 | return 0; | |
1427 | } | |
1428 | ||
e25d0bf9 | 1429 | static int s3c64xx_spi_resume(struct device *dev) |
230d42d4 | 1430 | { |
e25d0bf9 | 1431 | struct spi_master *master = spi_master_get(dev_get_drvdata(dev)); |
230d42d4 | 1432 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); |
ad7de729 | 1433 | struct s3c64xx_spi_info *sci = sdd->cntrlr_info; |
230d42d4 | 1434 | |
2b908075 TA |
1435 | if (!sci->cfg_gpio && dev->of_node) |
1436 | s3c64xx_spi_parse_dt_gpio(sdd); | |
1437 | else | |
1438 | sci->cfg_gpio(); | |
230d42d4 JB |
1439 | |
1440 | /* Enable the clock */ | |
b0d5d6e5 | 1441 | clk_enable(sdd->src_clk); |
230d42d4 JB |
1442 | clk_enable(sdd->clk); |
1443 | ||
a5238e36 | 1444 | s3c64xx_spi_hwinit(sdd, sdd->port_id); |
230d42d4 | 1445 | |
ad2a99af | 1446 | spi_master_resume(master); |
230d42d4 JB |
1447 | |
1448 | return 0; | |
1449 | } | |
230d42d4 JB |
1450 | #endif /* CONFIG_PM */ |
1451 | ||
b97b6621 MB |
1452 | #ifdef CONFIG_PM_RUNTIME |
1453 | static int s3c64xx_spi_runtime_suspend(struct device *dev) | |
1454 | { | |
1455 | struct spi_master *master = spi_master_get(dev_get_drvdata(dev)); | |
1456 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); | |
1457 | ||
1458 | clk_disable(sdd->clk); | |
1459 | clk_disable(sdd->src_clk); | |
1460 | ||
1461 | return 0; | |
1462 | } | |
1463 | ||
1464 | static int s3c64xx_spi_runtime_resume(struct device *dev) | |
1465 | { | |
1466 | struct spi_master *master = spi_master_get(dev_get_drvdata(dev)); | |
1467 | struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); | |
1468 | ||
1469 | clk_enable(sdd->src_clk); | |
1470 | clk_enable(sdd->clk); | |
1471 | ||
1472 | return 0; | |
1473 | } | |
1474 | #endif /* CONFIG_PM_RUNTIME */ | |
1475 | ||
e25d0bf9 MB |
1476 | static const struct dev_pm_ops s3c64xx_spi_pm = { |
1477 | SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume) | |
b97b6621 MB |
1478 | SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend, |
1479 | s3c64xx_spi_runtime_resume, NULL) | |
e25d0bf9 MB |
1480 | }; |
1481 | ||
10ce0473 | 1482 | static struct s3c64xx_spi_port_config s3c2443_spi_port_config = { |
a5238e36 TA |
1483 | .fifo_lvl_mask = { 0x7f }, |
1484 | .rx_lvl_offset = 13, | |
1485 | .tx_st_done = 21, | |
1486 | .high_speed = true, | |
1487 | }; | |
1488 | ||
10ce0473 | 1489 | static struct s3c64xx_spi_port_config s3c6410_spi_port_config = { |
a5238e36 TA |
1490 | .fifo_lvl_mask = { 0x7f, 0x7F }, |
1491 | .rx_lvl_offset = 13, | |
1492 | .tx_st_done = 21, | |
1493 | }; | |
1494 | ||
10ce0473 | 1495 | static struct s3c64xx_spi_port_config s5p64x0_spi_port_config = { |
a5238e36 TA |
1496 | .fifo_lvl_mask = { 0x1ff, 0x7F }, |
1497 | .rx_lvl_offset = 15, | |
1498 | .tx_st_done = 25, | |
1499 | }; | |
1500 | ||
10ce0473 | 1501 | static struct s3c64xx_spi_port_config s5pc100_spi_port_config = { |
a5238e36 TA |
1502 | .fifo_lvl_mask = { 0x7f, 0x7F }, |
1503 | .rx_lvl_offset = 13, | |
1504 | .tx_st_done = 21, | |
1505 | .high_speed = true, | |
1506 | }; | |
1507 | ||
10ce0473 | 1508 | static struct s3c64xx_spi_port_config s5pv210_spi_port_config = { |
a5238e36 TA |
1509 | .fifo_lvl_mask = { 0x1ff, 0x7F }, |
1510 | .rx_lvl_offset = 15, | |
1511 | .tx_st_done = 25, | |
1512 | .high_speed = true, | |
1513 | }; | |
1514 | ||
10ce0473 | 1515 | static struct s3c64xx_spi_port_config exynos4_spi_port_config = { |
a5238e36 TA |
1516 | .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F }, |
1517 | .rx_lvl_offset = 15, | |
1518 | .tx_st_done = 25, | |
1519 | .high_speed = true, | |
1520 | .clk_from_cmu = true, | |
1521 | }; | |
1522 | ||
1523 | static struct platform_device_id s3c64xx_spi_driver_ids[] = { | |
1524 | { | |
1525 | .name = "s3c2443-spi", | |
1526 | .driver_data = (kernel_ulong_t)&s3c2443_spi_port_config, | |
1527 | }, { | |
1528 | .name = "s3c6410-spi", | |
1529 | .driver_data = (kernel_ulong_t)&s3c6410_spi_port_config, | |
1530 | }, { | |
1531 | .name = "s5p64x0-spi", | |
1532 | .driver_data = (kernel_ulong_t)&s5p64x0_spi_port_config, | |
1533 | }, { | |
1534 | .name = "s5pc100-spi", | |
1535 | .driver_data = (kernel_ulong_t)&s5pc100_spi_port_config, | |
1536 | }, { | |
1537 | .name = "s5pv210-spi", | |
1538 | .driver_data = (kernel_ulong_t)&s5pv210_spi_port_config, | |
1539 | }, { | |
1540 | .name = "exynos4210-spi", | |
1541 | .driver_data = (kernel_ulong_t)&exynos4_spi_port_config, | |
1542 | }, | |
1543 | { }, | |
1544 | }; | |
1545 | ||
2b908075 TA |
1546 | #ifdef CONFIG_OF |
1547 | static const struct of_device_id s3c64xx_spi_dt_match[] = { | |
1548 | { .compatible = "samsung,exynos4210-spi", | |
1549 | .data = (void *)&exynos4_spi_port_config, | |
1550 | }, | |
1551 | { }, | |
1552 | }; | |
1553 | MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match); | |
1554 | #endif /* CONFIG_OF */ | |
1555 | ||
230d42d4 JB |
1556 | static struct platform_driver s3c64xx_spi_driver = { |
1557 | .driver = { | |
1558 | .name = "s3c64xx-spi", | |
1559 | .owner = THIS_MODULE, | |
e25d0bf9 | 1560 | .pm = &s3c64xx_spi_pm, |
2b908075 | 1561 | .of_match_table = of_match_ptr(s3c64xx_spi_dt_match), |
230d42d4 JB |
1562 | }, |
1563 | .remove = s3c64xx_spi_remove, | |
a5238e36 | 1564 | .id_table = s3c64xx_spi_driver_ids, |
230d42d4 JB |
1565 | }; |
1566 | MODULE_ALIAS("platform:s3c64xx-spi"); | |
1567 | ||
1568 | static int __init s3c64xx_spi_init(void) | |
1569 | { | |
1570 | return platform_driver_probe(&s3c64xx_spi_driver, s3c64xx_spi_probe); | |
1571 | } | |
d2a787fc | 1572 | subsys_initcall(s3c64xx_spi_init); |
230d42d4 JB |
1573 | |
1574 | static void __exit s3c64xx_spi_exit(void) | |
1575 | { | |
1576 | platform_driver_unregister(&s3c64xx_spi_driver); | |
1577 | } | |
1578 | module_exit(s3c64xx_spi_exit); | |
1579 | ||
1580 | MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>"); | |
1581 | MODULE_DESCRIPTION("S3C64XX SPI Controller Driver"); | |
1582 | MODULE_LICENSE("GPL"); |