blob: d8928d0592df95f47ae2cb1313ef63ce1788890b [file] [log] [blame]
Grant Likelyca632f52011-06-06 01:16:30 -06001/*
Jassi Brar230d42d2009-11-30 07:39:42 +00002 * 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>
Mark Brownc2573122011-11-10 10:57:32 +000023#include <linux/interrupt.h>
Jassi Brar230d42d2009-11-30 07:39:42 +000024#include <linux/delay.h>
25#include <linux/clk.h>
26#include <linux/dma-mapping.h>
27#include <linux/platform_device.h>
Mark Brownb97b6622011-12-04 00:58:06 +000028#include <linux/pm_runtime.h>
Jassi Brar230d42d2009-11-30 07:39:42 +000029#include <linux/spi/spi.h>
Thomas Abraham1c20c202012-07-13 07:15:14 +090030#include <linux/gpio.h>
Thomas Abraham2b908072012-07-13 07:15:15 +090031#include <linux/of.h>
32#include <linux/of_gpio.h>
Jassi Brar230d42d2009-11-30 07:39:42 +000033
34#include <mach/dma.h>
Arnd Bergmann436d42c2012-08-24 15:22:12 +020035#include <linux/platform_data/spi-s3c64xx.h>
Jassi Brar230d42d2009-11-30 07:39:42 +000036
Thomas Abrahama5238e32012-07-13 07:15:14 +090037#define MAX_SPI_PORTS 3
38
Jassi Brar230d42d2009-11-30 07:39:42 +000039/* 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)
Jingoo Han75bf3362013-01-31 15:25:01 +090065#define S3C64XX_SPI_PSR_MASK 0xff
Jassi Brar230d42d2009-11-30 07:39:42 +000066
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
Jassi Brar230d42d2009-11-30 07:39:42 +000082#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
Thomas Abrahama5238e32012-07-13 07:15:14 +0900116#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))
Jassi Brar230d42d2009-11-30 07:39:42 +0000122
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
Jassi Brar230d42d2009-11-30 07:39:42 +0000130#define RXBUSY (1<<2)
131#define TXBUSY (1<<3)
132
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900133struct s3c64xx_spi_dma_data {
134 unsigned ch;
Arnd Bergmannc10356b2012-04-30 16:31:27 +0000135 enum dma_transfer_direction direction;
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900136 enum dma_ch dmach;
Thomas Abraham2b908072012-07-13 07:15:15 +0900137 struct property *dma_prop;
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900138};
139
Jassi Brar230d42d2009-11-30 07:39:42 +0000140/**
Thomas Abrahama5238e32012-07-13 07:15:14 +0900141 * 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 */
154struct 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
162/**
Jassi Brar230d42d2009-11-30 07:39:42 +0000163 * struct s3c64xx_spi_driver_data - Runtime info holder for SPI driver.
164 * @clk: Pointer to the spi clock.
Jassi Brarb0d5d6e2010-01-20 13:49:44 -0700165 * @src_clk: Pointer to the clock used to generate SPI signals.
Jassi Brar230d42d2009-11-30 07:39:42 +0000166 * @master: Pointer to the SPI Protocol master.
Jassi Brar230d42d2009-11-30 07:39:42 +0000167 * @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.
Jassi Brar230d42d2009-11-30 07:39:42 +0000169 * @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.
Mark Brownc2573122011-11-10 10:57:32 +0000176 * @irq: interrupt
Jassi Brar230d42d2009-11-30 07:39:42 +0000177 * @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 */
182struct s3c64xx_spi_driver_data {
183 void __iomem *regs;
184 struct clk *clk;
Jassi Brarb0d5d6e2010-01-20 13:49:44 -0700185 struct clk *src_clk;
Jassi Brar230d42d2009-11-30 07:39:42 +0000186 struct platform_device *pdev;
187 struct spi_master *master;
Jassi Brarad7de722010-01-20 13:49:44 -0700188 struct s3c64xx_spi_info *cntrlr_info;
Jassi Brar230d42d2009-11-30 07:39:42 +0000189 struct spi_device *tgl_spi;
Jassi Brar230d42d2009-11-30 07:39:42 +0000190 struct list_head queue;
191 spinlock_t lock;
Jassi Brar230d42d2009-11-30 07:39:42 +0000192 unsigned long sfr_start;
193 struct completion xfer_completion;
194 unsigned state;
195 unsigned cur_mode, cur_bpw;
196 unsigned cur_speed;
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900197 struct s3c64xx_spi_dma_data rx_dma;
198 struct s3c64xx_spi_dma_data tx_dma;
Boojin Kim39d3e802011-09-02 09:44:41 +0900199 struct samsung_dma_ops *ops;
Thomas Abrahama5238e32012-07-13 07:15:14 +0900200 struct s3c64xx_spi_port_config *port_conf;
201 unsigned int port_id;
Thomas Abraham2b908072012-07-13 07:15:15 +0900202 unsigned long gpios[4];
Jassi Brar230d42d2009-11-30 07:39:42 +0000203};
204
205static struct s3c2410_dma_client s3c64xx_spi_dma_client = {
206 .name = "samsung-spi-dma",
207};
208
209static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
210{
Jassi Brar230d42d2009-11-30 07:39:42 +0000211 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);
Kyoungil Kim7d859ff2012-05-23 21:29:51 +0900218 val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
219 writel(val, regs + S3C64XX_SPI_CH_CFG);
220
221 val = readl(regs + S3C64XX_SPI_CH_CFG);
Jassi Brar230d42d2009-11-30 07:39:42 +0000222 val |= S3C64XX_SPI_CH_SW_RST;
223 val &= ~S3C64XX_SPI_CH_HS_EN;
224 writel(val, regs + S3C64XX_SPI_CH_CFG);
225
226 /* Flush TxFIFO*/
227 loops = msecs_to_loops(1);
228 do {
229 val = readl(regs + S3C64XX_SPI_STATUS);
Thomas Abrahama5238e32012-07-13 07:15:14 +0900230 } while (TX_FIFO_LVL(val, sdd) && loops--);
Jassi Brar230d42d2009-11-30 07:39:42 +0000231
Mark Brownbe7852a2010-08-23 17:40:56 +0100232 if (loops == 0)
233 dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
234
Jassi Brar230d42d2009-11-30 07:39:42 +0000235 /* Flush RxFIFO*/
236 loops = msecs_to_loops(1);
237 do {
238 val = readl(regs + S3C64XX_SPI_STATUS);
Thomas Abrahama5238e32012-07-13 07:15:14 +0900239 if (RX_FIFO_LVL(val, sdd))
Jassi Brar230d42d2009-11-30 07:39:42 +0000240 readl(regs + S3C64XX_SPI_RX_DATA);
241 else
242 break;
243 } while (loops--);
244
Mark Brownbe7852a2010-08-23 17:40:56 +0100245 if (loops == 0)
246 dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
247
Jassi Brar230d42d2009-11-30 07:39:42 +0000248 val = readl(regs + S3C64XX_SPI_CH_CFG);
249 val &= ~S3C64XX_SPI_CH_SW_RST;
250 writel(val, regs + S3C64XX_SPI_CH_CFG);
251
252 val = readl(regs + S3C64XX_SPI_MODE_CFG);
253 val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
254 writel(val, regs + S3C64XX_SPI_MODE_CFG);
Jassi Brar230d42d2009-11-30 07:39:42 +0000255}
256
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900257static void s3c64xx_spi_dmacb(void *data)
Boojin Kim39d3e802011-09-02 09:44:41 +0900258{
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900259 struct s3c64xx_spi_driver_data *sdd;
260 struct s3c64xx_spi_dma_data *dma = data;
Boojin Kim39d3e802011-09-02 09:44:41 +0900261 unsigned long flags;
262
Kyoungil Kim054ebcc2012-03-10 09:48:46 +0900263 if (dma->direction == DMA_DEV_TO_MEM)
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900264 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
Boojin Kim39d3e802011-09-02 09:44:41 +0900270 spin_lock_irqsave(&sdd->lock, flags);
271
Kyoungil Kim054ebcc2012-03-10 09:48:46 +0900272 if (dma->direction == DMA_DEV_TO_MEM) {
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900273 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 }
Boojin Kim39d3e802011-09-02 09:44:41 +0900281
282 spin_unlock_irqrestore(&sdd->lock, flags);
283}
284
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900285static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
286 unsigned len, dma_addr_t buf)
Boojin Kim39d3e802011-09-02 09:44:41 +0900287{
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900288 struct s3c64xx_spi_driver_data *sdd;
Boojin Kim4969c322012-06-19 13:27:03 +0900289 struct samsung_dma_prep info;
290 struct samsung_dma_config config;
Boojin Kim39d3e802011-09-02 09:44:41 +0900291
Boojin Kim4969c322012-06-19 13:27:03 +0900292 if (dma->direction == DMA_DEV_TO_MEM) {
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900293 sdd = container_of((void *)dma,
294 struct s3c64xx_spi_driver_data, rx_dma);
Boojin Kim4969c322012-06-19 13:27:03 +0900295 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 {
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900300 sdd = container_of((void *)dma,
301 struct s3c64xx_spi_driver_data, tx_dma);
Boojin Kim4969c322012-06-19 13:27:03 +0900302 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 }
Boojin Kim39d3e802011-09-02 09:44:41 +0900307
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900308 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;
Boojin Kim39d3e802011-09-02 09:44:41 +0900314
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900315 sdd->ops->prepare(dma->ch, &info);
316 sdd->ops->trigger(dma->ch);
317}
318
319static int acquire_dma(struct s3c64xx_spi_driver_data *sdd)
320{
Boojin Kim4969c322012-06-19 13:27:03 +0900321 struct samsung_dma_req req;
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900322
323 sdd->ops = samsung_dma_get_ops();
324
Boojin Kim4969c322012-06-19 13:27:03 +0900325 req.cap = DMA_SLAVE;
326 req.client = &s3c64xx_spi_dma_client;
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900327
Thomas Abraham2b908072012-07-13 07:15:15 +0900328 req.dt_dmach_prop = sdd->rx_dma.dma_prop;
Boojin Kim4969c322012-06-19 13:27:03 +0900329 sdd->rx_dma.ch = sdd->ops->request(sdd->rx_dma.dmach, &req);
Thomas Abraham2b908072012-07-13 07:15:15 +0900330 req.dt_dmach_prop = sdd->tx_dma.dma_prop;
Boojin Kim4969c322012-06-19 13:27:03 +0900331 sdd->tx_dma.ch = sdd->ops->request(sdd->tx_dma.dmach, &req);
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900332
333 return 1;
Boojin Kim39d3e802011-09-02 09:44:41 +0900334}
335
Jassi Brar230d42d2009-11-30 07:39:42 +0000336static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
337 struct spi_device *spi,
338 struct spi_transfer *xfer, int dma_mode)
339{
Jassi Brar230d42d2009-11-30 07:39:42 +0000340 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;
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900367 prepare_dma(&sdd->tx_dma, xfer->len, xfer->tx_dma);
Jassi Brar230d42d2009-11-30 07:39:42 +0000368 } else {
Jassi Brar0c92ecf2010-09-29 17:31:33 +0900369 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 }
Jassi Brar230d42d2009-11-30 07:39:42 +0000383 }
384 }
385
386 if (xfer->rx_buf != NULL) {
387 sdd->state |= RXBUSY;
388
Thomas Abrahama5238e32012-07-13 07:15:14 +0900389 if (sdd->port_conf->high_speed && sdd->cur_speed >= 30000000UL
Jassi Brar230d42d2009-11-30 07:39:42 +0000390 && !(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);
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900399 prepare_dma(&sdd->rx_dma, xfer->len, xfer->rx_dma);
Jassi Brar230d42d2009-11-30 07:39:42 +0000400 }
401 }
402
403 writel(modecfg, regs + S3C64XX_SPI_MODE_CFG);
404 writel(chcfg, regs + S3C64XX_SPI_CH_CFG);
405}
406
407static 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;
Thomas Abraham1c20c202012-07-13 07:15:14 +0900416 gpio_set_value(cs->line,
417 spi->mode & SPI_CS_HIGH ? 0 : 1);
Jassi Brar230d42d2009-11-30 07:39:42 +0000418 }
419 sdd->tgl_spi = NULL;
420 }
421
422 cs = spi->controller_data;
Thomas Abraham1c20c202012-07-13 07:15:14 +0900423 gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0);
Jassi Brar230d42d2009-11-30 07:39:42 +0000424}
425
426static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd,
427 struct spi_transfer *xfer, int dma_mode)
428{
Jassi Brar230d42d2009-11-30 07:39:42 +0000429 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;
Mark Brown9d8f86b2010-09-07 16:37:52 +0100435 ms += 10; /* some tolerance */
Jassi Brar230d42d2009-11-30 07:39:42 +0000436
437 if (dma_mode) {
438 val = msecs_to_jiffies(ms) + 10;
439 val = wait_for_completion_timeout(&sdd->xfer_completion, val);
440 } else {
Jassi Brarc3f139b2010-09-03 10:36:46 +0900441 u32 status;
Jassi Brar230d42d2009-11-30 07:39:42 +0000442 val = msecs_to_loops(ms);
443 do {
Jassi Brarc3f139b2010-09-03 10:36:46 +0900444 status = readl(regs + S3C64XX_SPI_STATUS);
Thomas Abrahama5238e32012-07-13 07:15:14 +0900445 } while (RX_FIFO_LVL(status, sdd) < xfer->len && --val);
Jassi Brar230d42d2009-11-30 07:39:42 +0000446 }
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);
Thomas Abrahama5238e32012-07-13 07:15:14 +0900464 while ((TX_FIFO_LVL(status, sdd)
465 || !S3C64XX_SPI_ST_TX_DONE(status, sdd))
Jassi Brar230d42d2009-11-30 07:39:42 +0000466 && --val) {
467 cpu_relax();
468 status = readl(regs + S3C64XX_SPI_STATUS);
469 }
470
471 if (!val)
472 return -EIO;
473 }
474 } else {
Jassi Brar230d42d2009-11-30 07:39:42 +0000475 /* If it was only Tx */
476 if (xfer->rx_buf == NULL) {
477 sdd->state &= ~TXBUSY;
478 return 0;
479 }
480
Jassi Brar0c92ecf2010-09-29 17:31:33 +0900481 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 }
Jassi Brar230d42d2009-11-30 07:39:42 +0000495 sdd->state &= ~RXBUSY;
496 }
497
498 return 0;
499}
500
501static 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
Thomas Abraham1c20c202012-07-13 07:15:14 +0900509 gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1);
Jassi Brar230d42d2009-11-30 07:39:42 +0000510}
511
512static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
513{
Jassi Brar230d42d2009-11-30 07:39:42 +0000514 void __iomem *regs = sdd->regs;
515 u32 val;
516
517 /* Disable Clock */
Thomas Abrahama5238e32012-07-13 07:15:14 +0900518 if (sdd->port_conf->clk_from_cmu) {
Thomas Abraham9f667bf2012-10-03 08:30:12 +0900519 clk_disable_unprepare(sdd->src_clk);
Jassi Brarb42a81c2010-09-29 17:31:33 +0900520 } else {
521 val = readl(regs + S3C64XX_SPI_CLK_CFG);
522 val &= ~S3C64XX_SPI_ENCLK_ENABLE;
523 writel(val, regs + S3C64XX_SPI_CLK_CFG);
524 }
Jassi Brar230d42d2009-11-30 07:39:42 +0000525
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;
Jassi Brar0c92ecf2010-09-29 17:31:33 +0900548 val |= S3C64XX_SPI_MODE_CH_TSZ_WORD;
Jassi Brar230d42d2009-11-30 07:39:42 +0000549 break;
550 case 16:
551 val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD;
Jassi Brar0c92ecf2010-09-29 17:31:33 +0900552 val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD;
Jassi Brar230d42d2009-11-30 07:39:42 +0000553 break;
554 default:
555 val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE;
Jassi Brar0c92ecf2010-09-29 17:31:33 +0900556 val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE;
Jassi Brar230d42d2009-11-30 07:39:42 +0000557 break;
558 }
Jassi Brar230d42d2009-11-30 07:39:42 +0000559
560 writel(val, regs + S3C64XX_SPI_MODE_CFG);
561
Thomas Abrahama5238e32012-07-13 07:15:14 +0900562 if (sdd->port_conf->clk_from_cmu) {
Jassi Brarb42a81c2010-09-29 17:31:33 +0900563 /* Configure Clock */
564 /* There is half-multiplier before the SPI */
565 clk_set_rate(sdd->src_clk, sdd->cur_speed * 2);
566 /* Enable Clock */
Thomas Abraham9f667bf2012-10-03 08:30:12 +0900567 clk_prepare_enable(sdd->src_clk);
Jassi Brarb42a81c2010-09-29 17:31:33 +0900568 } 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);
Jassi Brar230d42d2009-11-30 07:39:42 +0000575
Jassi Brarb42a81c2010-09-29 17:31:33 +0900576 /* 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 }
Jassi Brar230d42d2009-11-30 07:39:42 +0000581}
582
Jassi Brar230d42d2009-11-30 07:39:42 +0000583#define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
584
585static 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
Thomas Abrahama5238e32012-07-13 07:15:14 +0900603 if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1))
Jassi Brare02ddd42010-09-29 17:31:31 +0900604 continue;
605
Jassi Brar230d42d2009-11-30 07:39:42 +0000606 if (xfer->tx_buf != NULL) {
Jassi Brar251ee472010-09-03 10:36:26 +0900607 xfer->tx_dma = dma_map_single(dev,
608 (void *)xfer->tx_buf, xfer->len,
609 DMA_TO_DEVICE);
Jassi Brar230d42d2009-11-30 07:39:42 +0000610 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
634static 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
Thomas Abrahama5238e32012-07-13 07:15:14 +0900645 if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1))
Jassi Brare02ddd42010-09-29 17:31:31 +0900646 continue;
647
Jassi Brar230d42d2009-11-30 07:39:42 +0000648 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
Mark Brownad2a99a2012-02-15 14:48:32 -0800660static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
661 struct spi_message *msg)
Jassi Brar230d42d2009-11-30 07:39:42 +0000662{
Mark Brownad2a99a2012-02-15 14:48:32 -0800663 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
Jassi Brar230d42d2009-11-30 07:39:42 +0000664 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 */
Laxman Dewangan766ed702012-12-18 14:25:43 +0530700 bpw = xfer->bits_per_word;
Jassi Brar230d42d2009-11-30 07:39:42 +0000701 speed = xfer->speed_hz ? : spi->max_speed_hz;
702
Jassi Brar0c92ecf2010-09-29 17:31:33 +0900703 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
Jassi Brar230d42d2009-11-30 07:39:42 +0000711 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 */
Thomas Abrahama5238e32012-07-13 07:15:14 +0900718 if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1))
Jassi Brar230d42d2009-11-30 07:39:42 +0000719 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 */
Mark Brown5fc3e832012-07-19 14:36:23 +0900735 writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
Jassi Brar230d42d2009-11-30 07:39:42 +0000736
737 spin_unlock_irqrestore(&sdd->lock, flags);
738
739 status = wait_for_xfer(sdd, xfer, use_dma);
740
741 /* Quiese the signals */
Mark Brown5fc3e832012-07-19 14:36:23 +0900742 writel(S3C64XX_SPI_SLAVE_SIG_INACT,
743 sdd->regs + S3C64XX_SPI_SLAVE_SEL);
Jassi Brar230d42d2009-11-30 07:39:42 +0000744
745 if (status) {
Jingoo Han75bf3362013-01-31 15:25:01 +0900746 dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
Jassi Brar230d42d2009-11-30 07:39:42 +0000747 xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
748 (sdd->state & RXBUSY) ? 'f' : 'p',
749 (sdd->state & TXBUSY) ? 'f' : 'p',
750 xfer->len);
751
752 if (use_dma) {
753 if (xfer->tx_buf != NULL
754 && (sdd->state & TXBUSY))
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900755 sdd->ops->stop(sdd->tx_dma.ch);
Jassi Brar230d42d2009-11-30 07:39:42 +0000756 if (xfer->rx_buf != NULL
757 && (sdd->state & RXBUSY))
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900758 sdd->ops->stop(sdd->rx_dma.ch);
Jassi Brar230d42d2009-11-30 07:39:42 +0000759 }
760
761 goto out;
762 }
763
764 if (xfer->delay_usecs)
765 udelay(xfer->delay_usecs);
766
767 if (xfer->cs_change) {
768 /* Hint that the next mssg is gonna be
769 for the same device */
770 if (list_is_last(&xfer->transfer_list,
771 &msg->transfers))
772 cs_toggle = 1;
Jassi Brar230d42d2009-11-30 07:39:42 +0000773 }
774
775 msg->actual_length += xfer->len;
776
777 flush_fifo(sdd);
778 }
779
780out:
781 if (!cs_toggle || status)
782 disable_cs(sdd, spi);
783 else
784 sdd->tgl_spi = spi;
785
786 s3c64xx_spi_unmap_mssg(sdd, msg);
787
788 msg->status = status;
789
Mark Brownad2a99a2012-02-15 14:48:32 -0800790 spi_finalize_current_message(master);
791
792 return 0;
Jassi Brar230d42d2009-11-30 07:39:42 +0000793}
794
Mark Brownad2a99a2012-02-15 14:48:32 -0800795static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
Jassi Brar230d42d2009-11-30 07:39:42 +0000796{
Mark Brownad2a99a2012-02-15 14:48:32 -0800797 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
Jassi Brar230d42d2009-11-30 07:39:42 +0000798
799 /* Acquire DMA channels */
800 while (!acquire_dma(sdd))
Jingoo Han75bf3362013-01-31 15:25:01 +0900801 usleep_range(10000, 11000);
Jassi Brar230d42d2009-11-30 07:39:42 +0000802
Mark Brownb97b6622011-12-04 00:58:06 +0000803 pm_runtime_get_sync(&sdd->pdev->dev);
804
Mark Brownad2a99a2012-02-15 14:48:32 -0800805 return 0;
806}
Jassi Brar230d42d2009-11-30 07:39:42 +0000807
Mark Brownad2a99a2012-02-15 14:48:32 -0800808static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi)
809{
810 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
Jassi Brar230d42d2009-11-30 07:39:42 +0000811
812 /* Free DMA channels */
Boojin Kim82ab8cd2011-09-02 09:44:42 +0900813 sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client);
814 sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client);
Mark Brownb97b6622011-12-04 00:58:06 +0000815
816 pm_runtime_put(&sdd->pdev->dev);
Jassi Brar230d42d2009-11-30 07:39:42 +0000817
818 return 0;
819}
820
Thomas Abraham2b908072012-07-13 07:15:15 +0900821static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
822 struct s3c64xx_spi_driver_data *sdd,
823 struct spi_device *spi)
824{
825 struct s3c64xx_spi_csinfo *cs;
Arnd Bergmann4732cc62012-08-04 11:18:20 +0000826 struct device_node *slave_np, *data_np = NULL;
Thomas Abraham2b908072012-07-13 07:15:15 +0900827 u32 fb_delay = 0;
828
829 slave_np = spi->dev.of_node;
830 if (!slave_np) {
831 dev_err(&spi->dev, "device node not found\n");
832 return ERR_PTR(-EINVAL);
833 }
834
Srinivas Kandagatla06455bb2012-09-18 08:10:49 +0100835 data_np = of_get_child_by_name(slave_np, "controller-data");
Thomas Abraham2b908072012-07-13 07:15:15 +0900836 if (!data_np) {
837 dev_err(&spi->dev, "child node 'controller-data' not found\n");
838 return ERR_PTR(-EINVAL);
839 }
840
841 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
842 if (!cs) {
Jingoo Han75bf3362013-01-31 15:25:01 +0900843 dev_err(&spi->dev, "could not allocate memory for controller data\n");
Srinivas Kandagatla06455bb2012-09-18 08:10:49 +0100844 of_node_put(data_np);
Thomas Abraham2b908072012-07-13 07:15:15 +0900845 return ERR_PTR(-ENOMEM);
846 }
847
848 cs->line = of_get_named_gpio(data_np, "cs-gpio", 0);
849 if (!gpio_is_valid(cs->line)) {
Jingoo Han75bf3362013-01-31 15:25:01 +0900850 dev_err(&spi->dev, "chip select gpio is not specified or invalid\n");
Thomas Abraham2b908072012-07-13 07:15:15 +0900851 kfree(cs);
Srinivas Kandagatla06455bb2012-09-18 08:10:49 +0100852 of_node_put(data_np);
Thomas Abraham2b908072012-07-13 07:15:15 +0900853 return ERR_PTR(-EINVAL);
854 }
855
856 of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
857 cs->fb_delay = fb_delay;
Srinivas Kandagatla06455bb2012-09-18 08:10:49 +0100858 of_node_put(data_np);
Thomas Abraham2b908072012-07-13 07:15:15 +0900859 return cs;
860}
861
Jassi Brar230d42d2009-11-30 07:39:42 +0000862/*
863 * Here we only check the validity of requested configuration
864 * and save the configuration in a local data-structure.
865 * The controller is actually configured only just before we
866 * get a message to transfer.
867 */
868static int s3c64xx_spi_setup(struct spi_device *spi)
869{
870 struct s3c64xx_spi_csinfo *cs = spi->controller_data;
871 struct s3c64xx_spi_driver_data *sdd;
Jassi Brarad7de722010-01-20 13:49:44 -0700872 struct s3c64xx_spi_info *sci;
Jassi Brar230d42d2009-11-30 07:39:42 +0000873 struct spi_message *msg;
Jassi Brar230d42d2009-11-30 07:39:42 +0000874 unsigned long flags;
Thomas Abraham2b908072012-07-13 07:15:15 +0900875 int err;
Jassi Brar230d42d2009-11-30 07:39:42 +0000876
Thomas Abraham2b908072012-07-13 07:15:15 +0900877 sdd = spi_master_get_devdata(spi->master);
878 if (!cs && spi->dev.of_node) {
879 cs = s3c64xx_get_slave_ctrldata(sdd, spi);
880 spi->controller_data = cs;
881 }
882
883 if (IS_ERR_OR_NULL(cs)) {
Jassi Brar230d42d2009-11-30 07:39:42 +0000884 dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select);
885 return -ENODEV;
886 }
887
Thomas Abraham1c20c202012-07-13 07:15:14 +0900888 if (!spi_get_ctldata(spi)) {
Mark Brown707214d2012-07-19 14:36:16 +0900889 err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH,
890 dev_name(&spi->dev));
Thomas Abraham1c20c202012-07-13 07:15:14 +0900891 if (err) {
Mark Brown49f3eac2012-07-19 14:36:13 +0900892 dev_err(&spi->dev,
893 "Failed to get /CS gpio [%d]: %d\n",
894 cs->line, err);
Thomas Abraham2b908072012-07-13 07:15:15 +0900895 goto err_gpio_req;
Thomas Abraham1c20c202012-07-13 07:15:14 +0900896 }
897 spi_set_ctldata(spi, cs);
898 }
899
Jassi Brar230d42d2009-11-30 07:39:42 +0000900 sci = sdd->cntrlr_info;
901
902 spin_lock_irqsave(&sdd->lock, flags);
903
904 list_for_each_entry(msg, &sdd->queue, queue) {
905 /* Is some mssg is already queued for this device */
906 if (msg->spi == spi) {
907 dev_err(&spi->dev,
908 "setup: attempt while mssg in queue!\n");
909 spin_unlock_irqrestore(&sdd->lock, flags);
Thomas Abraham2b908072012-07-13 07:15:15 +0900910 err = -EBUSY;
911 goto err_msgq;
Jassi Brar230d42d2009-11-30 07:39:42 +0000912 }
913 }
914
Jassi Brar230d42d2009-11-30 07:39:42 +0000915 spin_unlock_irqrestore(&sdd->lock, flags);
916
917 if (spi->bits_per_word != 8
918 && spi->bits_per_word != 16
919 && spi->bits_per_word != 32) {
920 dev_err(&spi->dev, "setup: %dbits/wrd not supported!\n",
921 spi->bits_per_word);
922 err = -EINVAL;
923 goto setup_exit;
924 }
925
Mark Brownb97b6622011-12-04 00:58:06 +0000926 pm_runtime_get_sync(&sdd->pdev->dev);
927
Jassi Brar230d42d2009-11-30 07:39:42 +0000928 /* Check if we can provide the requested rate */
Thomas Abrahama5238e32012-07-13 07:15:14 +0900929 if (!sdd->port_conf->clk_from_cmu) {
Jassi Brarb42a81c2010-09-29 17:31:33 +0900930 u32 psr, speed;
Jassi Brar230d42d2009-11-30 07:39:42 +0000931
Jassi Brarb42a81c2010-09-29 17:31:33 +0900932 /* Max possible */
933 speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1);
Jassi Brar230d42d2009-11-30 07:39:42 +0000934
Jassi Brarb42a81c2010-09-29 17:31:33 +0900935 if (spi->max_speed_hz > speed)
936 spi->max_speed_hz = speed;
Jassi Brar230d42d2009-11-30 07:39:42 +0000937
Jassi Brarb42a81c2010-09-29 17:31:33 +0900938 psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
939 psr &= S3C64XX_SPI_PSR_MASK;
940 if (psr == S3C64XX_SPI_PSR_MASK)
941 psr--;
942
943 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
944 if (spi->max_speed_hz < speed) {
945 if (psr+1 < S3C64XX_SPI_PSR_MASK) {
946 psr++;
947 } else {
948 err = -EINVAL;
949 goto setup_exit;
950 }
Jassi Brar230d42d2009-11-30 07:39:42 +0000951 }
Jassi Brar230d42d2009-11-30 07:39:42 +0000952
Jassi Brarb42a81c2010-09-29 17:31:33 +0900953 speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
Thomas Abraham2b908072012-07-13 07:15:15 +0900954 if (spi->max_speed_hz >= speed) {
Jassi Brarb42a81c2010-09-29 17:31:33 +0900955 spi->max_speed_hz = speed;
Thomas Abraham2b908072012-07-13 07:15:15 +0900956 } else {
Mark Browne1b0f0d2012-12-20 18:27:31 +0000957 dev_err(&spi->dev, "Can't set %dHz transfer speed\n",
958 spi->max_speed_hz);
Jassi Brarb42a81c2010-09-29 17:31:33 +0900959 err = -EINVAL;
Thomas Abraham2b908072012-07-13 07:15:15 +0900960 goto setup_exit;
961 }
Jassi Brarb42a81c2010-09-29 17:31:33 +0900962 }
Jassi Brar230d42d2009-11-30 07:39:42 +0000963
Mark Brownb97b6622011-12-04 00:58:06 +0000964 pm_runtime_put(&sdd->pdev->dev);
Thomas Abraham2b908072012-07-13 07:15:15 +0900965 disable_cs(sdd, spi);
966 return 0;
Mark Brownb97b6622011-12-04 00:58:06 +0000967
Jassi Brar230d42d2009-11-30 07:39:42 +0000968setup_exit:
Jassi Brar230d42d2009-11-30 07:39:42 +0000969 /* setup() returns with device de-selected */
970 disable_cs(sdd, spi);
971
Thomas Abraham2b908072012-07-13 07:15:15 +0900972err_msgq:
973 gpio_free(cs->line);
974 spi_set_ctldata(spi, NULL);
975
976err_gpio_req:
Sylwester Nawrocki5bee3b92012-09-13 16:31:30 +0200977 if (spi->dev.of_node)
978 kfree(cs);
Thomas Abraham2b908072012-07-13 07:15:15 +0900979
Jassi Brar230d42d2009-11-30 07:39:42 +0000980 return err;
981}
982
Thomas Abraham1c20c202012-07-13 07:15:14 +0900983static void s3c64xx_spi_cleanup(struct spi_device *spi)
984{
985 struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi);
986
Thomas Abraham2b908072012-07-13 07:15:15 +0900987 if (cs) {
Thomas Abraham1c20c202012-07-13 07:15:14 +0900988 gpio_free(cs->line);
Thomas Abraham2b908072012-07-13 07:15:15 +0900989 if (spi->dev.of_node)
990 kfree(cs);
991 }
Thomas Abraham1c20c202012-07-13 07:15:14 +0900992 spi_set_ctldata(spi, NULL);
993}
994
Mark Brownc2573122011-11-10 10:57:32 +0000995static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
996{
997 struct s3c64xx_spi_driver_data *sdd = data;
998 struct spi_master *spi = sdd->master;
999 unsigned int val;
1000
1001 val = readl(sdd->regs + S3C64XX_SPI_PENDING_CLR);
1002
1003 val &= S3C64XX_SPI_PND_RX_OVERRUN_CLR |
1004 S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
1005 S3C64XX_SPI_PND_TX_OVERRUN_CLR |
1006 S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
1007
1008 writel(val, sdd->regs + S3C64XX_SPI_PENDING_CLR);
1009
1010 if (val & S3C64XX_SPI_PND_RX_OVERRUN_CLR)
1011 dev_err(&spi->dev, "RX overrun\n");
1012 if (val & S3C64XX_SPI_PND_RX_UNDERRUN_CLR)
1013 dev_err(&spi->dev, "RX underrun\n");
1014 if (val & S3C64XX_SPI_PND_TX_OVERRUN_CLR)
1015 dev_err(&spi->dev, "TX overrun\n");
1016 if (val & S3C64XX_SPI_PND_TX_UNDERRUN_CLR)
1017 dev_err(&spi->dev, "TX underrun\n");
1018
1019 return IRQ_HANDLED;
1020}
1021
Jassi Brar230d42d2009-11-30 07:39:42 +00001022static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
1023{
Jassi Brarad7de722010-01-20 13:49:44 -07001024 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
Jassi Brar230d42d2009-11-30 07:39:42 +00001025 void __iomem *regs = sdd->regs;
1026 unsigned int val;
1027
1028 sdd->cur_speed = 0;
1029
Mark Brown5fc3e832012-07-19 14:36:23 +09001030 writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
Jassi Brar230d42d2009-11-30 07:39:42 +00001031
1032 /* Disable Interrupts - we use Polling if not DMA mode */
1033 writel(0, regs + S3C64XX_SPI_INT_EN);
1034
Thomas Abrahama5238e32012-07-13 07:15:14 +09001035 if (!sdd->port_conf->clk_from_cmu)
Jassi Brarb42a81c2010-09-29 17:31:33 +09001036 writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT,
Jassi Brar230d42d2009-11-30 07:39:42 +00001037 regs + S3C64XX_SPI_CLK_CFG);
1038 writel(0, regs + S3C64XX_SPI_MODE_CFG);
1039 writel(0, regs + S3C64XX_SPI_PACKET_CNT);
1040
1041 /* Clear any irq pending bits */
1042 writel(readl(regs + S3C64XX_SPI_PENDING_CLR),
1043 regs + S3C64XX_SPI_PENDING_CLR);
1044
1045 writel(0, regs + S3C64XX_SPI_SWAP_CFG);
1046
1047 val = readl(regs + S3C64XX_SPI_MODE_CFG);
1048 val &= ~S3C64XX_SPI_MODE_4BURST;
1049 val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
1050 val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF);
1051 writel(val, regs + S3C64XX_SPI_MODE_CFG);
1052
1053 flush_fifo(sdd);
1054}
1055
Grant Likelyfd4a3192012-12-07 16:57:14 +00001056static int s3c64xx_spi_get_dmares(
Thomas Abraham2b908072012-07-13 07:15:15 +09001057 struct s3c64xx_spi_driver_data *sdd, bool tx)
1058{
1059 struct platform_device *pdev = sdd->pdev;
1060 struct s3c64xx_spi_dma_data *dma_data;
1061 struct property *prop;
1062 struct resource *res;
1063 char prop_name[15], *chan_str;
1064
1065 if (tx) {
1066 dma_data = &sdd->tx_dma;
Arnd Bergmannc10356b2012-04-30 16:31:27 +00001067 dma_data->direction = DMA_MEM_TO_DEV;
Thomas Abraham2b908072012-07-13 07:15:15 +09001068 chan_str = "tx";
1069 } else {
1070 dma_data = &sdd->rx_dma;
Arnd Bergmannc10356b2012-04-30 16:31:27 +00001071 dma_data->direction = DMA_DEV_TO_MEM;
Thomas Abraham2b908072012-07-13 07:15:15 +09001072 chan_str = "rx";
1073 }
1074
1075 if (!sdd->pdev->dev.of_node) {
1076 res = platform_get_resource(pdev, IORESOURCE_DMA, tx ? 0 : 1);
1077 if (!res) {
Jingoo Han75bf3362013-01-31 15:25:01 +09001078 dev_err(&pdev->dev, "Unable to get SPI-%s dma resource\n",
1079 chan_str);
Thomas Abraham2b908072012-07-13 07:15:15 +09001080 return -ENXIO;
1081 }
1082 dma_data->dmach = res->start;
1083 return 0;
1084 }
1085
1086 sprintf(prop_name, "%s-dma-channel", chan_str);
1087 prop = of_find_property(pdev->dev.of_node, prop_name, NULL);
1088 if (!prop) {
1089 dev_err(&pdev->dev, "%s dma channel property not specified\n",
1090 chan_str);
1091 return -ENXIO;
1092 }
1093
1094 dma_data->dmach = DMACH_DT_PROP;
1095 dma_data->dma_prop = prop;
1096 return 0;
1097}
1098
1099#ifdef CONFIG_OF
1100static int s3c64xx_spi_parse_dt_gpio(struct s3c64xx_spi_driver_data *sdd)
1101{
1102 struct device *dev = &sdd->pdev->dev;
1103 int idx, gpio, ret;
1104
1105 /* find gpios for mosi, miso and clock lines */
1106 for (idx = 0; idx < 3; idx++) {
1107 gpio = of_get_gpio(dev->of_node, idx);
1108 if (!gpio_is_valid(gpio)) {
1109 dev_err(dev, "invalid gpio[%d]: %d\n", idx, gpio);
1110 goto free_gpio;
1111 }
Abhilash Kesavan45e50332012-11-07 11:40:12 +05301112 sdd->gpios[idx] = gpio;
Thomas Abraham2b908072012-07-13 07:15:15 +09001113 ret = gpio_request(gpio, "spi-bus");
1114 if (ret) {
Mark Brown49f3eac2012-07-19 14:36:13 +09001115 dev_err(dev, "gpio [%d] request failed: %d\n",
1116 gpio, ret);
Thomas Abraham2b908072012-07-13 07:15:15 +09001117 goto free_gpio;
1118 }
1119 }
1120 return 0;
1121
1122free_gpio:
1123 while (--idx >= 0)
1124 gpio_free(sdd->gpios[idx]);
1125 return -EINVAL;
1126}
1127
1128static void s3c64xx_spi_dt_gpio_free(struct s3c64xx_spi_driver_data *sdd)
1129{
1130 unsigned int idx;
1131 for (idx = 0; idx < 3; idx++)
1132 gpio_free(sdd->gpios[idx]);
1133}
1134
Jingoo Han75bf3362013-01-31 15:25:01 +09001135static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
Thomas Abraham2b908072012-07-13 07:15:15 +09001136{
1137 struct s3c64xx_spi_info *sci;
1138 u32 temp;
1139
1140 sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL);
1141 if (!sci) {
1142 dev_err(dev, "memory allocation for spi_info failed\n");
1143 return ERR_PTR(-ENOMEM);
1144 }
1145
1146 if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) {
Jingoo Han75bf3362013-01-31 15:25:01 +09001147 dev_warn(dev, "spi bus clock parent not specified, using clock at index 0 as parent\n");
Thomas Abraham2b908072012-07-13 07:15:15 +09001148 sci->src_clk_nr = 0;
1149 } else {
1150 sci->src_clk_nr = temp;
1151 }
1152
1153 if (of_property_read_u32(dev->of_node, "num-cs", &temp)) {
Jingoo Han75bf3362013-01-31 15:25:01 +09001154 dev_warn(dev, "number of chip select lines not specified, assuming 1 chip select line\n");
Thomas Abraham2b908072012-07-13 07:15:15 +09001155 sci->num_cs = 1;
1156 } else {
1157 sci->num_cs = temp;
1158 }
1159
1160 return sci;
1161}
1162#else
1163static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev)
1164{
1165 return dev->platform_data;
1166}
1167
1168static int s3c64xx_spi_parse_dt_gpio(struct s3c64xx_spi_driver_data *sdd)
1169{
1170 return -EINVAL;
1171}
1172
1173static void s3c64xx_spi_dt_gpio_free(struct s3c64xx_spi_driver_data *sdd)
1174{
1175}
1176#endif
1177
1178static const struct of_device_id s3c64xx_spi_dt_match[];
1179
Thomas Abrahama5238e32012-07-13 07:15:14 +09001180static inline struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config(
1181 struct platform_device *pdev)
1182{
Thomas Abraham2b908072012-07-13 07:15:15 +09001183#ifdef CONFIG_OF
1184 if (pdev->dev.of_node) {
1185 const struct of_device_id *match;
1186 match = of_match_node(s3c64xx_spi_dt_match, pdev->dev.of_node);
1187 return (struct s3c64xx_spi_port_config *)match->data;
1188 }
1189#endif
Thomas Abrahama5238e32012-07-13 07:15:14 +09001190 return (struct s3c64xx_spi_port_config *)
1191 platform_get_device_id(pdev)->driver_data;
1192}
1193
Jassi Brar230d42d2009-11-30 07:39:42 +00001194static int __init s3c64xx_spi_probe(struct platform_device *pdev)
1195{
Thomas Abraham2b908072012-07-13 07:15:15 +09001196 struct resource *mem_res;
Jassi Brar230d42d2009-11-30 07:39:42 +00001197 struct s3c64xx_spi_driver_data *sdd;
Thomas Abraham2b908072012-07-13 07:15:15 +09001198 struct s3c64xx_spi_info *sci = pdev->dev.platform_data;
Jassi Brar230d42d2009-11-30 07:39:42 +00001199 struct spi_master *master;
Mark Brownc2573122011-11-10 10:57:32 +00001200 int ret, irq;
Padmavathi Vennaa24d8502011-11-02 20:04:19 +09001201 char clk_name[16];
Jassi Brar230d42d2009-11-30 07:39:42 +00001202
Thomas Abraham2b908072012-07-13 07:15:15 +09001203 if (!sci && pdev->dev.of_node) {
1204 sci = s3c64xx_spi_parse_dt(&pdev->dev);
1205 if (IS_ERR(sci))
1206 return PTR_ERR(sci);
Jassi Brar230d42d2009-11-30 07:39:42 +00001207 }
1208
Thomas Abraham2b908072012-07-13 07:15:15 +09001209 if (!sci) {
Jassi Brar230d42d2009-11-30 07:39:42 +00001210 dev_err(&pdev->dev, "platform_data missing!\n");
1211 return -ENODEV;
1212 }
1213
Jassi Brar230d42d2009-11-30 07:39:42 +00001214 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1215 if (mem_res == NULL) {
1216 dev_err(&pdev->dev, "Unable to get SPI MEM resource\n");
1217 return -ENXIO;
1218 }
1219
Mark Brownc2573122011-11-10 10:57:32 +00001220 irq = platform_get_irq(pdev, 0);
1221 if (irq < 0) {
1222 dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq);
1223 return irq;
1224 }
1225
Jassi Brar230d42d2009-11-30 07:39:42 +00001226 master = spi_alloc_master(&pdev->dev,
1227 sizeof(struct s3c64xx_spi_driver_data));
1228 if (master == NULL) {
1229 dev_err(&pdev->dev, "Unable to allocate SPI Master\n");
1230 return -ENOMEM;
1231 }
1232
Jassi Brar230d42d2009-11-30 07:39:42 +00001233 platform_set_drvdata(pdev, master);
1234
1235 sdd = spi_master_get_devdata(master);
Thomas Abrahama5238e32012-07-13 07:15:14 +09001236 sdd->port_conf = s3c64xx_spi_get_port_config(pdev);
Jassi Brar230d42d2009-11-30 07:39:42 +00001237 sdd->master = master;
1238 sdd->cntrlr_info = sci;
1239 sdd->pdev = pdev;
1240 sdd->sfr_start = mem_res->start;
Thomas Abraham2b908072012-07-13 07:15:15 +09001241 if (pdev->dev.of_node) {
1242 ret = of_alias_get_id(pdev->dev.of_node, "spi");
1243 if (ret < 0) {
Jingoo Han75bf3362013-01-31 15:25:01 +09001244 dev_err(&pdev->dev, "failed to get alias id, errno %d\n",
1245 ret);
Thomas Abraham2b908072012-07-13 07:15:15 +09001246 goto err0;
1247 }
1248 sdd->port_id = ret;
1249 } else {
1250 sdd->port_id = pdev->id;
1251 }
Jassi Brar230d42d2009-11-30 07:39:42 +00001252
1253 sdd->cur_bpw = 8;
1254
Thomas Abraham2b908072012-07-13 07:15:15 +09001255 ret = s3c64xx_spi_get_dmares(sdd, true);
1256 if (ret)
1257 goto err0;
1258
1259 ret = s3c64xx_spi_get_dmares(sdd, false);
1260 if (ret)
1261 goto err0;
1262
1263 master->dev.of_node = pdev->dev.of_node;
Thomas Abrahama5238e32012-07-13 07:15:14 +09001264 master->bus_num = sdd->port_id;
Jassi Brar230d42d2009-11-30 07:39:42 +00001265 master->setup = s3c64xx_spi_setup;
Thomas Abraham1c20c202012-07-13 07:15:14 +09001266 master->cleanup = s3c64xx_spi_cleanup;
Mark Brownad2a99a2012-02-15 14:48:32 -08001267 master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
1268 master->transfer_one_message = s3c64xx_spi_transfer_one_message;
1269 master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;
Jassi Brar230d42d2009-11-30 07:39:42 +00001270 master->num_chipselect = sci->num_cs;
1271 master->dma_alignment = 8;
1272 /* the spi->mode bits understood by this driver: */
1273 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1274
Mark Brownb1ec4302012-07-19 14:36:19 +09001275 sdd->regs = devm_request_and_ioremap(&pdev->dev, mem_res);
Jassi Brar230d42d2009-11-30 07:39:42 +00001276 if (sdd->regs == NULL) {
1277 dev_err(&pdev->dev, "Unable to remap IO\n");
1278 ret = -ENXIO;
Jingoo Han4eb77002013-01-10 11:04:21 +09001279 goto err0;
Jassi Brar230d42d2009-11-30 07:39:42 +00001280 }
1281
Thomas Abraham2b908072012-07-13 07:15:15 +09001282 if (!sci->cfg_gpio && pdev->dev.of_node) {
1283 if (s3c64xx_spi_parse_dt_gpio(sdd))
1284 return -EBUSY;
1285 } else if (sci->cfg_gpio == NULL || sci->cfg_gpio()) {
Jassi Brar230d42d2009-11-30 07:39:42 +00001286 dev_err(&pdev->dev, "Unable to config gpio\n");
1287 ret = -EBUSY;
Jingoo Han4eb77002013-01-10 11:04:21 +09001288 goto err0;
Jassi Brar230d42d2009-11-30 07:39:42 +00001289 }
1290
1291 /* Setup clocks */
Jingoo Han4eb77002013-01-10 11:04:21 +09001292 sdd->clk = devm_clk_get(&pdev->dev, "spi");
Jassi Brar230d42d2009-11-30 07:39:42 +00001293 if (IS_ERR(sdd->clk)) {
1294 dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n");
1295 ret = PTR_ERR(sdd->clk);
Jingoo Han4eb77002013-01-10 11:04:21 +09001296 goto err1;
Jassi Brar230d42d2009-11-30 07:39:42 +00001297 }
1298
Thomas Abraham9f667bf2012-10-03 08:30:12 +09001299 if (clk_prepare_enable(sdd->clk)) {
Jassi Brar230d42d2009-11-30 07:39:42 +00001300 dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n");
1301 ret = -EBUSY;
Jingoo Han4eb77002013-01-10 11:04:21 +09001302 goto err1;
Jassi Brar230d42d2009-11-30 07:39:42 +00001303 }
1304
Padmavathi Vennaa24d8502011-11-02 20:04:19 +09001305 sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr);
Jingoo Han4eb77002013-01-10 11:04:21 +09001306 sdd->src_clk = devm_clk_get(&pdev->dev, clk_name);
Jassi Brarb0d5d6e2010-01-20 13:49:44 -07001307 if (IS_ERR(sdd->src_clk)) {
Jassi Brar230d42d2009-11-30 07:39:42 +00001308 dev_err(&pdev->dev,
Padmavathi Vennaa24d8502011-11-02 20:04:19 +09001309 "Unable to acquire clock '%s'\n", clk_name);
Jassi Brarb0d5d6e2010-01-20 13:49:44 -07001310 ret = PTR_ERR(sdd->src_clk);
Jingoo Han4eb77002013-01-10 11:04:21 +09001311 goto err2;
Jassi Brar230d42d2009-11-30 07:39:42 +00001312 }
1313
Thomas Abraham9f667bf2012-10-03 08:30:12 +09001314 if (clk_prepare_enable(sdd->src_clk)) {
Padmavathi Vennaa24d8502011-11-02 20:04:19 +09001315 dev_err(&pdev->dev, "Couldn't enable clock '%s'\n", clk_name);
Jassi Brar230d42d2009-11-30 07:39:42 +00001316 ret = -EBUSY;
Jingoo Han4eb77002013-01-10 11:04:21 +09001317 goto err2;
Jassi Brar230d42d2009-11-30 07:39:42 +00001318 }
1319
Jassi Brar230d42d2009-11-30 07:39:42 +00001320 /* Setup Deufult Mode */
Thomas Abrahama5238e32012-07-13 07:15:14 +09001321 s3c64xx_spi_hwinit(sdd, sdd->port_id);
Jassi Brar230d42d2009-11-30 07:39:42 +00001322
1323 spin_lock_init(&sdd->lock);
1324 init_completion(&sdd->xfer_completion);
Jassi Brar230d42d2009-11-30 07:39:42 +00001325 INIT_LIST_HEAD(&sdd->queue);
1326
Jingoo Han4eb77002013-01-10 11:04:21 +09001327 ret = devm_request_irq(&pdev->dev, irq, s3c64xx_spi_irq, 0,
1328 "spi-s3c64xx", sdd);
Mark Brownc2573122011-11-10 10:57:32 +00001329 if (ret != 0) {
1330 dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n",
1331 irq, ret);
Jingoo Han4eb77002013-01-10 11:04:21 +09001332 goto err3;
Mark Brownc2573122011-11-10 10:57:32 +00001333 }
1334
1335 writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
1336 S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
1337 sdd->regs + S3C64XX_SPI_INT_EN);
1338
Jassi Brar230d42d2009-11-30 07:39:42 +00001339 if (spi_register_master(master)) {
1340 dev_err(&pdev->dev, "cannot register SPI master\n");
1341 ret = -EBUSY;
Jingoo Han4eb77002013-01-10 11:04:21 +09001342 goto err3;
Jassi Brar230d42d2009-11-30 07:39:42 +00001343 }
1344
Jingoo Han75bf3362013-01-31 15:25:01 +09001345 dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n",
Thomas Abrahama5238e32012-07-13 07:15:14 +09001346 sdd->port_id, master->num_chipselect);
Joe Perches8a349d42010-02-02 07:22:13 +00001347 dev_dbg(&pdev->dev, "\tIOmem=[0x%x-0x%x]\tDMA=[Rx-%d, Tx-%d]\n",
Jassi Brar230d42d2009-11-30 07:39:42 +00001348 mem_res->end, mem_res->start,
Boojin Kim82ab8cd2011-09-02 09:44:42 +09001349 sdd->rx_dma.dmach, sdd->tx_dma.dmach);
Jassi Brar230d42d2009-11-30 07:39:42 +00001350
Mark Brownb97b6622011-12-04 00:58:06 +00001351 pm_runtime_enable(&pdev->dev);
1352
Jassi Brar230d42d2009-11-30 07:39:42 +00001353 return 0;
1354
Jassi Brar230d42d2009-11-30 07:39:42 +00001355err3:
Jingoo Han4eb77002013-01-10 11:04:21 +09001356 clk_disable_unprepare(sdd->src_clk);
1357err2:
1358 clk_disable_unprepare(sdd->clk);
1359err1:
Thomas Abraham2b908072012-07-13 07:15:15 +09001360 if (!sdd->cntrlr_info->cfg_gpio && pdev->dev.of_node)
1361 s3c64xx_spi_dt_gpio_free(sdd);
Jassi Brar230d42d2009-11-30 07:39:42 +00001362err0:
1363 platform_set_drvdata(pdev, NULL);
1364 spi_master_put(master);
1365
1366 return ret;
1367}
1368
1369static int s3c64xx_spi_remove(struct platform_device *pdev)
1370{
1371 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
1372 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
Jassi Brar230d42d2009-11-30 07:39:42 +00001373
Mark Brownb97b6622011-12-04 00:58:06 +00001374 pm_runtime_disable(&pdev->dev);
1375
Jassi Brar230d42d2009-11-30 07:39:42 +00001376 spi_unregister_master(master);
1377
Mark Brownc2573122011-11-10 10:57:32 +00001378 writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
1379
Thomas Abraham9f667bf2012-10-03 08:30:12 +09001380 clk_disable_unprepare(sdd->src_clk);
Jassi Brar230d42d2009-11-30 07:39:42 +00001381
Thomas Abraham9f667bf2012-10-03 08:30:12 +09001382 clk_disable_unprepare(sdd->clk);
Jassi Brar230d42d2009-11-30 07:39:42 +00001383
Thomas Abraham2b908072012-07-13 07:15:15 +09001384 if (!sdd->cntrlr_info->cfg_gpio && pdev->dev.of_node)
1385 s3c64xx_spi_dt_gpio_free(sdd);
1386
Jassi Brar230d42d2009-11-30 07:39:42 +00001387 platform_set_drvdata(pdev, NULL);
1388 spi_master_put(master);
1389
1390 return 0;
1391}
1392
1393#ifdef CONFIG_PM
Mark Browne25d0bf2011-12-04 00:36:18 +00001394static int s3c64xx_spi_suspend(struct device *dev)
Jassi Brar230d42d2009-11-30 07:39:42 +00001395{
Guenter Roeck9a2a5242012-08-16 20:14:25 -07001396 struct spi_master *master = dev_get_drvdata(dev);
Jassi Brar230d42d2009-11-30 07:39:42 +00001397 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
Jassi Brar230d42d2009-11-30 07:39:42 +00001398
Mark Brownad2a99a2012-02-15 14:48:32 -08001399 spi_master_suspend(master);
Jassi Brar230d42d2009-11-30 07:39:42 +00001400
1401 /* Disable the clock */
Thomas Abraham9f667bf2012-10-03 08:30:12 +09001402 clk_disable_unprepare(sdd->src_clk);
1403 clk_disable_unprepare(sdd->clk);
Jassi Brar230d42d2009-11-30 07:39:42 +00001404
Thomas Abraham2b908072012-07-13 07:15:15 +09001405 if (!sdd->cntrlr_info->cfg_gpio && dev->of_node)
1406 s3c64xx_spi_dt_gpio_free(sdd);
1407
Jassi Brar230d42d2009-11-30 07:39:42 +00001408 sdd->cur_speed = 0; /* Output Clock is stopped */
1409
1410 return 0;
1411}
1412
Mark Browne25d0bf2011-12-04 00:36:18 +00001413static int s3c64xx_spi_resume(struct device *dev)
Jassi Brar230d42d2009-11-30 07:39:42 +00001414{
Guenter Roeck9a2a5242012-08-16 20:14:25 -07001415 struct spi_master *master = dev_get_drvdata(dev);
Jassi Brar230d42d2009-11-30 07:39:42 +00001416 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
Jassi Brarad7de722010-01-20 13:49:44 -07001417 struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
Jassi Brar230d42d2009-11-30 07:39:42 +00001418
Thomas Abraham2b908072012-07-13 07:15:15 +09001419 if (!sci->cfg_gpio && dev->of_node)
1420 s3c64xx_spi_parse_dt_gpio(sdd);
1421 else
1422 sci->cfg_gpio();
Jassi Brar230d42d2009-11-30 07:39:42 +00001423
1424 /* Enable the clock */
Thomas Abraham9f667bf2012-10-03 08:30:12 +09001425 clk_prepare_enable(sdd->src_clk);
1426 clk_prepare_enable(sdd->clk);
Jassi Brar230d42d2009-11-30 07:39:42 +00001427
Thomas Abrahama5238e32012-07-13 07:15:14 +09001428 s3c64xx_spi_hwinit(sdd, sdd->port_id);
Jassi Brar230d42d2009-11-30 07:39:42 +00001429
Mark Brownad2a99a2012-02-15 14:48:32 -08001430 spi_master_resume(master);
Jassi Brar230d42d2009-11-30 07:39:42 +00001431
1432 return 0;
1433}
Jassi Brar230d42d2009-11-30 07:39:42 +00001434#endif /* CONFIG_PM */
1435
Mark Brownb97b6622011-12-04 00:58:06 +00001436#ifdef CONFIG_PM_RUNTIME
1437static int s3c64xx_spi_runtime_suspend(struct device *dev)
1438{
Guenter Roeck9a2a5242012-08-16 20:14:25 -07001439 struct spi_master *master = dev_get_drvdata(dev);
Mark Brownb97b6622011-12-04 00:58:06 +00001440 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1441
Thomas Abraham9f667bf2012-10-03 08:30:12 +09001442 clk_disable_unprepare(sdd->clk);
1443 clk_disable_unprepare(sdd->src_clk);
Mark Brownb97b6622011-12-04 00:58:06 +00001444
1445 return 0;
1446}
1447
1448static int s3c64xx_spi_runtime_resume(struct device *dev)
1449{
Guenter Roeck9a2a5242012-08-16 20:14:25 -07001450 struct spi_master *master = dev_get_drvdata(dev);
Mark Brownb97b6622011-12-04 00:58:06 +00001451 struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
1452
Thomas Abraham9f667bf2012-10-03 08:30:12 +09001453 clk_prepare_enable(sdd->src_clk);
1454 clk_prepare_enable(sdd->clk);
Mark Brownb97b6622011-12-04 00:58:06 +00001455
1456 return 0;
1457}
1458#endif /* CONFIG_PM_RUNTIME */
1459
Mark Browne25d0bf2011-12-04 00:36:18 +00001460static const struct dev_pm_ops s3c64xx_spi_pm = {
1461 SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)
Mark Brownb97b6622011-12-04 00:58:06 +00001462 SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,
1463 s3c64xx_spi_runtime_resume, NULL)
Mark Browne25d0bf2011-12-04 00:36:18 +00001464};
1465
Sachin Kamat10ce0472012-08-03 10:08:12 +05301466static struct s3c64xx_spi_port_config s3c2443_spi_port_config = {
Thomas Abrahama5238e32012-07-13 07:15:14 +09001467 .fifo_lvl_mask = { 0x7f },
1468 .rx_lvl_offset = 13,
1469 .tx_st_done = 21,
1470 .high_speed = true,
1471};
1472
Sachin Kamat10ce0472012-08-03 10:08:12 +05301473static struct s3c64xx_spi_port_config s3c6410_spi_port_config = {
Thomas Abrahama5238e32012-07-13 07:15:14 +09001474 .fifo_lvl_mask = { 0x7f, 0x7F },
1475 .rx_lvl_offset = 13,
1476 .tx_st_done = 21,
1477};
1478
Sachin Kamat10ce0472012-08-03 10:08:12 +05301479static struct s3c64xx_spi_port_config s5p64x0_spi_port_config = {
Thomas Abrahama5238e32012-07-13 07:15:14 +09001480 .fifo_lvl_mask = { 0x1ff, 0x7F },
1481 .rx_lvl_offset = 15,
1482 .tx_st_done = 25,
1483};
1484
Sachin Kamat10ce0472012-08-03 10:08:12 +05301485static struct s3c64xx_spi_port_config s5pc100_spi_port_config = {
Thomas Abrahama5238e32012-07-13 07:15:14 +09001486 .fifo_lvl_mask = { 0x7f, 0x7F },
1487 .rx_lvl_offset = 13,
1488 .tx_st_done = 21,
1489 .high_speed = true,
1490};
1491
Sachin Kamat10ce0472012-08-03 10:08:12 +05301492static struct s3c64xx_spi_port_config s5pv210_spi_port_config = {
Thomas Abrahama5238e32012-07-13 07:15:14 +09001493 .fifo_lvl_mask = { 0x1ff, 0x7F },
1494 .rx_lvl_offset = 15,
1495 .tx_st_done = 25,
1496 .high_speed = true,
1497};
1498
Sachin Kamat10ce0472012-08-03 10:08:12 +05301499static struct s3c64xx_spi_port_config exynos4_spi_port_config = {
Thomas Abrahama5238e32012-07-13 07:15:14 +09001500 .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F },
1501 .rx_lvl_offset = 15,
1502 .tx_st_done = 25,
1503 .high_speed = true,
1504 .clk_from_cmu = true,
1505};
1506
1507static struct platform_device_id s3c64xx_spi_driver_ids[] = {
1508 {
1509 .name = "s3c2443-spi",
1510 .driver_data = (kernel_ulong_t)&s3c2443_spi_port_config,
1511 }, {
1512 .name = "s3c6410-spi",
1513 .driver_data = (kernel_ulong_t)&s3c6410_spi_port_config,
1514 }, {
1515 .name = "s5p64x0-spi",
1516 .driver_data = (kernel_ulong_t)&s5p64x0_spi_port_config,
1517 }, {
1518 .name = "s5pc100-spi",
1519 .driver_data = (kernel_ulong_t)&s5pc100_spi_port_config,
1520 }, {
1521 .name = "s5pv210-spi",
1522 .driver_data = (kernel_ulong_t)&s5pv210_spi_port_config,
1523 }, {
1524 .name = "exynos4210-spi",
1525 .driver_data = (kernel_ulong_t)&exynos4_spi_port_config,
1526 },
1527 { },
1528};
1529
Thomas Abraham2b908072012-07-13 07:15:15 +09001530#ifdef CONFIG_OF
1531static const struct of_device_id s3c64xx_spi_dt_match[] = {
1532 { .compatible = "samsung,exynos4210-spi",
1533 .data = (void *)&exynos4_spi_port_config,
1534 },
1535 { },
1536};
1537MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match);
1538#endif /* CONFIG_OF */
1539
Jassi Brar230d42d2009-11-30 07:39:42 +00001540static struct platform_driver s3c64xx_spi_driver = {
1541 .driver = {
1542 .name = "s3c64xx-spi",
1543 .owner = THIS_MODULE,
Mark Browne25d0bf2011-12-04 00:36:18 +00001544 .pm = &s3c64xx_spi_pm,
Thomas Abraham2b908072012-07-13 07:15:15 +09001545 .of_match_table = of_match_ptr(s3c64xx_spi_dt_match),
Jassi Brar230d42d2009-11-30 07:39:42 +00001546 },
1547 .remove = s3c64xx_spi_remove,
Thomas Abrahama5238e32012-07-13 07:15:14 +09001548 .id_table = s3c64xx_spi_driver_ids,
Jassi Brar230d42d2009-11-30 07:39:42 +00001549};
1550MODULE_ALIAS("platform:s3c64xx-spi");
1551
1552static int __init s3c64xx_spi_init(void)
1553{
1554 return platform_driver_probe(&s3c64xx_spi_driver, s3c64xx_spi_probe);
1555}
Mark Brownd2a787f2010-09-07 11:29:17 +01001556subsys_initcall(s3c64xx_spi_init);
Jassi Brar230d42d2009-11-30 07:39:42 +00001557
1558static void __exit s3c64xx_spi_exit(void)
1559{
1560 platform_driver_unregister(&s3c64xx_spi_driver);
1561}
1562module_exit(s3c64xx_spi_exit);
1563
1564MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
1565MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");
1566MODULE_LICENSE("GPL");