Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 3 | * Copyright (C) 2013, Intel Corporation |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 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/device.h> |
| 23 | #include <linux/ioport.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/interrupt.h> |
| 26 | #include <linux/platform_device.h> |
Sebastian Andrzej Siewior | 8348c25 | 2010-11-22 17:12:15 -0800 | [diff] [blame] | 27 | #include <linux/spi/pxa2xx_spi.h> |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 28 | #include <linux/spi/spi.h> |
| 29 | #include <linux/workqueue.h> |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 30 | #include <linux/delay.h> |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 31 | #include <linux/gpio.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 33 | #include <linux/clk.h> |
Mika Westerberg | 7d94a50 | 2013-01-22 12:26:30 +0200 | [diff] [blame] | 34 | #include <linux/pm_runtime.h> |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 35 | |
| 36 | #include <asm/io.h> |
| 37 | #include <asm/irq.h> |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 38 | #include <asm/delay.h> |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 39 | |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 40 | #include "spi-pxa2xx.h" |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 41 | |
| 42 | MODULE_AUTHOR("Stephen Street"); |
Will Newton | 037cdaf | 2007-12-10 15:49:25 -0800 | [diff] [blame] | 43 | MODULE_DESCRIPTION("PXA2xx SSP SPI Controller"); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 44 | MODULE_LICENSE("GPL"); |
Kay Sievers | 7e38c3c | 2008-04-10 21:29:20 -0700 | [diff] [blame] | 45 | MODULE_ALIAS("platform:pxa2xx-spi"); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 46 | |
| 47 | #define MAX_BUSES 3 |
| 48 | |
Vernon Sauder | f1f640a | 2008-10-15 22:02:43 -0700 | [diff] [blame] | 49 | #define TIMOUT_DFLT 1000 |
| 50 | |
Ned Forrester | b97c74b | 2008-02-23 15:23:40 -0800 | [diff] [blame] | 51 | /* |
| 52 | * for testing SSCR1 changes that require SSP restart, basically |
| 53 | * everything except the service and interrupt enables, the pxa270 developer |
| 54 | * manual says only SSCR1_SCFR, SSCR1_SPH, SSCR1_SPO need to be in this |
| 55 | * list, but the PXA255 dev man says all bits without really meaning the |
| 56 | * service and interrupt enables |
| 57 | */ |
| 58 | #define SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \ |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 59 | | SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \ |
Ned Forrester | b97c74b | 2008-02-23 15:23:40 -0800 | [diff] [blame] | 60 | | SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \ |
| 61 | | SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \ |
| 62 | | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \ |
| 63 | | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 64 | |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 65 | #define LPSS_RX_THRESH_DFLT 64 |
| 66 | #define LPSS_TX_LOTHRESH_DFLT 160 |
| 67 | #define LPSS_TX_HITHRESH_DFLT 224 |
| 68 | |
| 69 | /* Offset from drv_data->lpss_base */ |
| 70 | #define SPI_CS_CONTROL 0x18 |
| 71 | #define SPI_CS_CONTROL_SW_MODE BIT(0) |
| 72 | #define SPI_CS_CONTROL_CS_HIGH BIT(1) |
| 73 | |
| 74 | static bool is_lpss_ssp(const struct driver_data *drv_data) |
| 75 | { |
| 76 | return drv_data->ssp_type == LPSS_SSP; |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * Read and write LPSS SSP private registers. Caller must first check that |
| 81 | * is_lpss_ssp() returns true before these can be called. |
| 82 | */ |
| 83 | static u32 __lpss_ssp_read_priv(struct driver_data *drv_data, unsigned offset) |
| 84 | { |
| 85 | WARN_ON(!drv_data->lpss_base); |
| 86 | return readl(drv_data->lpss_base + offset); |
| 87 | } |
| 88 | |
| 89 | static void __lpss_ssp_write_priv(struct driver_data *drv_data, |
| 90 | unsigned offset, u32 value) |
| 91 | { |
| 92 | WARN_ON(!drv_data->lpss_base); |
| 93 | writel(value, drv_data->lpss_base + offset); |
| 94 | } |
| 95 | |
| 96 | /* |
| 97 | * lpss_ssp_setup - perform LPSS SSP specific setup |
| 98 | * @drv_data: pointer to the driver private data |
| 99 | * |
| 100 | * Perform LPSS SSP specific setup. This function must be called first if |
| 101 | * one is going to use LPSS SSP private registers. |
| 102 | */ |
| 103 | static void lpss_ssp_setup(struct driver_data *drv_data) |
| 104 | { |
| 105 | unsigned offset = 0x400; |
| 106 | u32 value, orig; |
| 107 | |
| 108 | if (!is_lpss_ssp(drv_data)) |
| 109 | return; |
| 110 | |
| 111 | /* |
| 112 | * Perform auto-detection of the LPSS SSP private registers. They |
| 113 | * can be either at 1k or 2k offset from the base address. |
| 114 | */ |
| 115 | orig = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL); |
| 116 | |
| 117 | value = orig | SPI_CS_CONTROL_SW_MODE; |
| 118 | writel(value, drv_data->ioaddr + offset + SPI_CS_CONTROL); |
| 119 | value = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL); |
| 120 | if (value != (orig | SPI_CS_CONTROL_SW_MODE)) { |
| 121 | offset = 0x800; |
| 122 | goto detection_done; |
| 123 | } |
| 124 | |
| 125 | value &= ~SPI_CS_CONTROL_SW_MODE; |
| 126 | writel(value, drv_data->ioaddr + offset + SPI_CS_CONTROL); |
| 127 | value = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL); |
| 128 | if (value != orig) { |
| 129 | offset = 0x800; |
| 130 | goto detection_done; |
| 131 | } |
| 132 | |
| 133 | detection_done: |
| 134 | /* Now set the LPSS base */ |
| 135 | drv_data->lpss_base = drv_data->ioaddr + offset; |
| 136 | |
| 137 | /* Enable software chip select control */ |
| 138 | value = SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH; |
| 139 | __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value); |
| 140 | } |
| 141 | |
| 142 | static void lpss_ssp_cs_control(struct driver_data *drv_data, bool enable) |
| 143 | { |
| 144 | u32 value; |
| 145 | |
| 146 | if (!is_lpss_ssp(drv_data)) |
| 147 | return; |
| 148 | |
| 149 | value = __lpss_ssp_read_priv(drv_data, SPI_CS_CONTROL); |
| 150 | if (enable) |
| 151 | value &= ~SPI_CS_CONTROL_CS_HIGH; |
| 152 | else |
| 153 | value |= SPI_CS_CONTROL_CS_HIGH; |
| 154 | __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value); |
| 155 | } |
| 156 | |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 157 | static void cs_assert(struct driver_data *drv_data) |
| 158 | { |
| 159 | struct chip_data *chip = drv_data->cur_chip; |
| 160 | |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 161 | if (drv_data->ssp_type == CE4100_SSP) { |
| 162 | write_SSSR(drv_data->cur_chip->frm, drv_data->ioaddr); |
| 163 | return; |
| 164 | } |
| 165 | |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 166 | if (chip->cs_control) { |
| 167 | chip->cs_control(PXA2XX_CS_ASSERT); |
| 168 | return; |
| 169 | } |
| 170 | |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 171 | if (gpio_is_valid(chip->gpio_cs)) { |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 172 | gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted); |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 173 | return; |
| 174 | } |
| 175 | |
| 176 | lpss_ssp_cs_control(drv_data, true); |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | static void cs_deassert(struct driver_data *drv_data) |
| 180 | { |
| 181 | struct chip_data *chip = drv_data->cur_chip; |
| 182 | |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 183 | if (drv_data->ssp_type == CE4100_SSP) |
| 184 | return; |
| 185 | |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 186 | if (chip->cs_control) { |
Daniel Ribeiro | 2b2562d | 2009-04-08 22:48:03 -0300 | [diff] [blame] | 187 | chip->cs_control(PXA2XX_CS_DEASSERT); |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 188 | return; |
| 189 | } |
| 190 | |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 191 | if (gpio_is_valid(chip->gpio_cs)) { |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 192 | gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted); |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 193 | return; |
| 194 | } |
| 195 | |
| 196 | lpss_ssp_cs_control(drv_data, false); |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 197 | } |
| 198 | |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 199 | int pxa2xx_spi_flush(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 200 | { |
| 201 | unsigned long limit = loops_per_jiffy << 1; |
| 202 | |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 203 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 204 | |
| 205 | do { |
| 206 | while (read_SSSR(reg) & SSSR_RNE) { |
| 207 | read_SSDR(reg); |
| 208 | } |
Roel Kluin | 306c68a | 2009-04-21 12:24:46 -0700 | [diff] [blame] | 209 | } while ((read_SSSR(reg) & SSSR_BSY) && --limit); |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 210 | write_SSSR_CS(drv_data, SSSR_ROR); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 211 | |
| 212 | return limit; |
| 213 | } |
| 214 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 215 | static int null_writer(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 216 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 217 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 218 | u8 n_bytes = drv_data->n_bytes; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 219 | |
Sebastian Andrzej Siewior | 4a25605 | 2010-11-22 17:12:15 -0800 | [diff] [blame] | 220 | if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 221 | || (drv_data->tx == drv_data->tx_end)) |
| 222 | return 0; |
| 223 | |
| 224 | write_SSDR(0, reg); |
| 225 | drv_data->tx += n_bytes; |
| 226 | |
| 227 | return 1; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 228 | } |
| 229 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 230 | static int null_reader(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 231 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 232 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 233 | u8 n_bytes = drv_data->n_bytes; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 234 | |
| 235 | while ((read_SSSR(reg) & SSSR_RNE) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 236 | && (drv_data->rx < drv_data->rx_end)) { |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 237 | read_SSDR(reg); |
| 238 | drv_data->rx += n_bytes; |
| 239 | } |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 240 | |
| 241 | return drv_data->rx == drv_data->rx_end; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 242 | } |
| 243 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 244 | static int u8_writer(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 245 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 246 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 247 | |
Sebastian Andrzej Siewior | 4a25605 | 2010-11-22 17:12:15 -0800 | [diff] [blame] | 248 | if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 249 | || (drv_data->tx == drv_data->tx_end)) |
| 250 | return 0; |
| 251 | |
| 252 | write_SSDR(*(u8 *)(drv_data->tx), reg); |
| 253 | ++drv_data->tx; |
| 254 | |
| 255 | return 1; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 256 | } |
| 257 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 258 | static int u8_reader(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 259 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 260 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 261 | |
| 262 | while ((read_SSSR(reg) & SSSR_RNE) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 263 | && (drv_data->rx < drv_data->rx_end)) { |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 264 | *(u8 *)(drv_data->rx) = read_SSDR(reg); |
| 265 | ++drv_data->rx; |
| 266 | } |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 267 | |
| 268 | return drv_data->rx == drv_data->rx_end; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 269 | } |
| 270 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 271 | static int u16_writer(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 272 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 273 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 274 | |
Sebastian Andrzej Siewior | 4a25605 | 2010-11-22 17:12:15 -0800 | [diff] [blame] | 275 | if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 276 | || (drv_data->tx == drv_data->tx_end)) |
| 277 | return 0; |
| 278 | |
| 279 | write_SSDR(*(u16 *)(drv_data->tx), reg); |
| 280 | drv_data->tx += 2; |
| 281 | |
| 282 | return 1; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 283 | } |
| 284 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 285 | static int u16_reader(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 286 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 287 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 288 | |
| 289 | while ((read_SSSR(reg) & SSSR_RNE) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 290 | && (drv_data->rx < drv_data->rx_end)) { |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 291 | *(u16 *)(drv_data->rx) = read_SSDR(reg); |
| 292 | drv_data->rx += 2; |
| 293 | } |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 294 | |
| 295 | return drv_data->rx == drv_data->rx_end; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 296 | } |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 297 | |
| 298 | static int u32_writer(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 299 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 300 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 301 | |
Sebastian Andrzej Siewior | 4a25605 | 2010-11-22 17:12:15 -0800 | [diff] [blame] | 302 | if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 303 | || (drv_data->tx == drv_data->tx_end)) |
| 304 | return 0; |
| 305 | |
| 306 | write_SSDR(*(u32 *)(drv_data->tx), reg); |
| 307 | drv_data->tx += 4; |
| 308 | |
| 309 | return 1; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 310 | } |
| 311 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 312 | static int u32_reader(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 313 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 314 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 315 | |
| 316 | while ((read_SSSR(reg) & SSSR_RNE) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 317 | && (drv_data->rx < drv_data->rx_end)) { |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 318 | *(u32 *)(drv_data->rx) = read_SSDR(reg); |
| 319 | drv_data->rx += 4; |
| 320 | } |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 321 | |
| 322 | return drv_data->rx == drv_data->rx_end; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 323 | } |
| 324 | |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 325 | void *pxa2xx_spi_next_transfer(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 326 | { |
| 327 | struct spi_message *msg = drv_data->cur_msg; |
| 328 | struct spi_transfer *trans = drv_data->cur_transfer; |
| 329 | |
| 330 | /* Move to next transfer */ |
| 331 | if (trans->transfer_list.next != &msg->transfers) { |
| 332 | drv_data->cur_transfer = |
| 333 | list_entry(trans->transfer_list.next, |
| 334 | struct spi_transfer, |
| 335 | transfer_list); |
| 336 | return RUNNING_STATE; |
| 337 | } else |
| 338 | return DONE_STATE; |
| 339 | } |
| 340 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 341 | /* caller already set message->status; dma and pio irqs are blocked */ |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 342 | static void giveback(struct driver_data *drv_data) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 343 | { |
| 344 | struct spi_transfer* last_transfer; |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 345 | struct spi_message *msg; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 346 | |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 347 | msg = drv_data->cur_msg; |
| 348 | drv_data->cur_msg = NULL; |
| 349 | drv_data->cur_transfer = NULL; |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 350 | |
| 351 | last_transfer = list_entry(msg->transfers.prev, |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 352 | struct spi_transfer, |
| 353 | transfer_list); |
| 354 | |
Ned Forrester | 8423597 | 2008-09-13 02:33:17 -0700 | [diff] [blame] | 355 | /* Delay if requested before any change in chip select */ |
| 356 | if (last_transfer->delay_usecs) |
| 357 | udelay(last_transfer->delay_usecs); |
| 358 | |
| 359 | /* Drop chip select UNLESS cs_change is true or we are returning |
| 360 | * a message with an error, or next message is for another chip |
| 361 | */ |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 362 | if (!last_transfer->cs_change) |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 363 | cs_deassert(drv_data); |
Ned Forrester | 8423597 | 2008-09-13 02:33:17 -0700 | [diff] [blame] | 364 | else { |
| 365 | struct spi_message *next_msg; |
| 366 | |
| 367 | /* Holding of cs was hinted, but we need to make sure |
| 368 | * the next message is for the same chip. Don't waste |
| 369 | * time with the following tests unless this was hinted. |
| 370 | * |
| 371 | * We cannot postpone this until pump_messages, because |
| 372 | * after calling msg->complete (below) the driver that |
| 373 | * sent the current message could be unloaded, which |
| 374 | * could invalidate the cs_control() callback... |
| 375 | */ |
| 376 | |
| 377 | /* get a pointer to the next message, if any */ |
Mika Westerberg | 7f86bde | 2013-01-22 12:26:26 +0200 | [diff] [blame] | 378 | next_msg = spi_get_next_queued_message(drv_data->master); |
Ned Forrester | 8423597 | 2008-09-13 02:33:17 -0700 | [diff] [blame] | 379 | |
| 380 | /* see if the next and current messages point |
| 381 | * to the same chip |
| 382 | */ |
| 383 | if (next_msg && next_msg->spi != msg->spi) |
| 384 | next_msg = NULL; |
| 385 | if (!next_msg || msg->state == ERROR_STATE) |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 386 | cs_deassert(drv_data); |
Ned Forrester | 8423597 | 2008-09-13 02:33:17 -0700 | [diff] [blame] | 387 | } |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 388 | |
Mika Westerberg | 7f86bde | 2013-01-22 12:26:26 +0200 | [diff] [blame] | 389 | spi_finalize_current_message(drv_data->master); |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 390 | drv_data->cur_chip = NULL; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 391 | } |
| 392 | |
Sebastian Andrzej Siewior | 579d3bb | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 393 | static void reset_sccr1(struct driver_data *drv_data) |
| 394 | { |
| 395 | void __iomem *reg = drv_data->ioaddr; |
| 396 | struct chip_data *chip = drv_data->cur_chip; |
| 397 | u32 sccr1_reg; |
| 398 | |
| 399 | sccr1_reg = read_SSCR1(reg) & ~drv_data->int_cr1; |
| 400 | sccr1_reg &= ~SSCR1_RFT; |
| 401 | sccr1_reg |= chip->threshold; |
| 402 | write_SSCR1(sccr1_reg, reg); |
| 403 | } |
| 404 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 405 | static void int_error_stop(struct driver_data *drv_data, const char* msg) |
| 406 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 407 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 408 | |
| 409 | /* Stop and reset SSP */ |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 410 | write_SSSR_CS(drv_data, drv_data->clear_sr); |
Sebastian Andrzej Siewior | 579d3bb | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 411 | reset_sccr1(drv_data); |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 412 | if (!pxa25x_ssp_comp(drv_data)) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 413 | write_SSTO(0, reg); |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 414 | pxa2xx_spi_flush(drv_data); |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 415 | write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg); |
| 416 | |
| 417 | dev_err(&drv_data->pdev->dev, "%s\n", msg); |
| 418 | |
| 419 | drv_data->cur_msg->state = ERROR_STATE; |
| 420 | tasklet_schedule(&drv_data->pump_transfers); |
| 421 | } |
| 422 | |
| 423 | static void int_transfer_complete(struct driver_data *drv_data) |
| 424 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 425 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 426 | |
| 427 | /* Stop SSP */ |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 428 | write_SSSR_CS(drv_data, drv_data->clear_sr); |
Sebastian Andrzej Siewior | 579d3bb | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 429 | reset_sccr1(drv_data); |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 430 | if (!pxa25x_ssp_comp(drv_data)) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 431 | write_SSTO(0, reg); |
| 432 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 433 | /* Update total byte transferred return count actual bytes read */ |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 434 | drv_data->cur_msg->actual_length += drv_data->len - |
| 435 | (drv_data->rx_end - drv_data->rx); |
| 436 | |
Ned Forrester | 8423597 | 2008-09-13 02:33:17 -0700 | [diff] [blame] | 437 | /* Transfer delays and chip select release are |
| 438 | * handled in pump_transfers or giveback |
| 439 | */ |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 440 | |
| 441 | /* Move to next transfer */ |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 442 | drv_data->cur_msg->state = pxa2xx_spi_next_transfer(drv_data); |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 443 | |
| 444 | /* Schedule transfer tasklet */ |
| 445 | tasklet_schedule(&drv_data->pump_transfers); |
| 446 | } |
| 447 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 448 | static irqreturn_t interrupt_transfer(struct driver_data *drv_data) |
| 449 | { |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 450 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 451 | |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 452 | u32 irq_mask = (read_SSCR1(reg) & SSCR1_TIE) ? |
| 453 | drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 454 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 455 | u32 irq_status = read_SSSR(reg) & irq_mask; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 456 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 457 | if (irq_status & SSSR_ROR) { |
| 458 | int_error_stop(drv_data, "interrupt_transfer: fifo overrun"); |
| 459 | return IRQ_HANDLED; |
| 460 | } |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 461 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 462 | if (irq_status & SSSR_TINT) { |
| 463 | write_SSSR(SSSR_TINT, reg); |
| 464 | if (drv_data->read(drv_data)) { |
| 465 | int_transfer_complete(drv_data); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 466 | return IRQ_HANDLED; |
| 467 | } |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 468 | } |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 469 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 470 | /* Drain rx fifo, Fill tx fifo and prevent overruns */ |
| 471 | do { |
| 472 | if (drv_data->read(drv_data)) { |
| 473 | int_transfer_complete(drv_data); |
| 474 | return IRQ_HANDLED; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 475 | } |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 476 | } while (drv_data->write(drv_data)); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 477 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 478 | if (drv_data->read(drv_data)) { |
| 479 | int_transfer_complete(drv_data); |
| 480 | return IRQ_HANDLED; |
| 481 | } |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 482 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 483 | if (drv_data->tx == drv_data->tx_end) { |
Sebastian Andrzej Siewior | 579d3bb | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 484 | u32 bytes_left; |
| 485 | u32 sccr1_reg; |
| 486 | |
| 487 | sccr1_reg = read_SSCR1(reg); |
| 488 | sccr1_reg &= ~SSCR1_TIE; |
| 489 | |
| 490 | /* |
| 491 | * PXA25x_SSP has no timeout, set up rx threshould for the |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 492 | * remaining RX bytes. |
Sebastian Andrzej Siewior | 579d3bb | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 493 | */ |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 494 | if (pxa25x_ssp_comp(drv_data)) { |
Sebastian Andrzej Siewior | 579d3bb | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 495 | |
| 496 | sccr1_reg &= ~SSCR1_RFT; |
| 497 | |
| 498 | bytes_left = drv_data->rx_end - drv_data->rx; |
| 499 | switch (drv_data->n_bytes) { |
| 500 | case 4: |
| 501 | bytes_left >>= 1; |
| 502 | case 2: |
| 503 | bytes_left >>= 1; |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 504 | } |
Sebastian Andrzej Siewior | 579d3bb | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 505 | |
| 506 | if (bytes_left > RX_THRESH_DFLT) |
| 507 | bytes_left = RX_THRESH_DFLT; |
| 508 | |
| 509 | sccr1_reg |= SSCR1_RxTresh(bytes_left); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 510 | } |
Sebastian Andrzej Siewior | 579d3bb | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 511 | write_SSCR1(sccr1_reg, reg); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 512 | } |
| 513 | |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 514 | /* We did something */ |
| 515 | return IRQ_HANDLED; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 516 | } |
| 517 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 518 | static irqreturn_t ssp_int(int irq, void *dev_id) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 519 | { |
Jeff Garzik | c7bec5a | 2006-10-06 15:00:58 -0400 | [diff] [blame] | 520 | struct driver_data *drv_data = dev_id; |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 521 | void __iomem *reg = drv_data->ioaddr; |
Mika Westerberg | 7d94a50 | 2013-01-22 12:26:30 +0200 | [diff] [blame] | 522 | u32 sccr1_reg; |
Sebastian Andrzej Siewior | 49cbb1e | 2010-11-22 17:12:14 -0800 | [diff] [blame] | 523 | u32 mask = drv_data->mask_sr; |
| 524 | u32 status; |
| 525 | |
Mika Westerberg | 7d94a50 | 2013-01-22 12:26:30 +0200 | [diff] [blame] | 526 | /* |
| 527 | * The IRQ might be shared with other peripherals so we must first |
| 528 | * check that are we RPM suspended or not. If we are we assume that |
| 529 | * the IRQ was not for us (we shouldn't be RPM suspended when the |
| 530 | * interrupt is enabled). |
| 531 | */ |
| 532 | if (pm_runtime_suspended(&drv_data->pdev->dev)) |
| 533 | return IRQ_NONE; |
| 534 | |
| 535 | sccr1_reg = read_SSCR1(reg); |
Sebastian Andrzej Siewior | 49cbb1e | 2010-11-22 17:12:14 -0800 | [diff] [blame] | 536 | status = read_SSSR(reg); |
| 537 | |
| 538 | /* Ignore possible writes if we don't need to write */ |
| 539 | if (!(sccr1_reg & SSCR1_TIE)) |
| 540 | mask &= ~SSSR_TFS; |
| 541 | |
| 542 | if (!(status & mask)) |
| 543 | return IRQ_NONE; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 544 | |
| 545 | if (!drv_data->cur_msg) { |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 546 | |
| 547 | write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg); |
| 548 | write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg); |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 549 | if (!pxa25x_ssp_comp(drv_data)) |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 550 | write_SSTO(0, reg); |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 551 | write_SSSR_CS(drv_data, drv_data->clear_sr); |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 552 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 553 | dev_err(&drv_data->pdev->dev, "bad message state " |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 554 | "in interrupt handler\n"); |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 555 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 556 | /* Never fail */ |
| 557 | return IRQ_HANDLED; |
| 558 | } |
| 559 | |
| 560 | return drv_data->transfer_handler(drv_data); |
| 561 | } |
| 562 | |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 563 | static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate) |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 564 | { |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 565 | unsigned long ssp_clk = drv_data->max_clk_rate; |
| 566 | const struct ssp_device *ssp = drv_data->ssp; |
| 567 | |
| 568 | rate = min_t(int, ssp_clk, rate); |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 569 | |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 570 | if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP) |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 571 | return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8; |
| 572 | else |
| 573 | return ((ssp_clk / rate - 1) & 0xfff) << 8; |
| 574 | } |
| 575 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 576 | static void pump_transfers(unsigned long data) |
| 577 | { |
| 578 | struct driver_data *drv_data = (struct driver_data *)data; |
| 579 | struct spi_message *message = NULL; |
| 580 | struct spi_transfer *transfer = NULL; |
| 581 | struct spi_transfer *previous = NULL; |
| 582 | struct chip_data *chip = NULL; |
David Brownell | cf43369 | 2008-04-28 02:14:17 -0700 | [diff] [blame] | 583 | void __iomem *reg = drv_data->ioaddr; |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 584 | u32 clk_div = 0; |
| 585 | u8 bits = 0; |
| 586 | u32 speed = 0; |
| 587 | u32 cr0; |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 588 | u32 cr1; |
| 589 | u32 dma_thresh = drv_data->cur_chip->dma_threshold; |
| 590 | u32 dma_burst = drv_data->cur_chip->dma_burst_size; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 591 | |
| 592 | /* Get current state information */ |
| 593 | message = drv_data->cur_msg; |
| 594 | transfer = drv_data->cur_transfer; |
| 595 | chip = drv_data->cur_chip; |
| 596 | |
| 597 | /* Handle for abort */ |
| 598 | if (message->state == ERROR_STATE) { |
| 599 | message->status = -EIO; |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 600 | giveback(drv_data); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 601 | return; |
| 602 | } |
| 603 | |
| 604 | /* Handle end of message */ |
| 605 | if (message->state == DONE_STATE) { |
| 606 | message->status = 0; |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 607 | giveback(drv_data); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 608 | return; |
| 609 | } |
| 610 | |
Ned Forrester | 8423597 | 2008-09-13 02:33:17 -0700 | [diff] [blame] | 611 | /* Delay if requested at end of transfer before CS change */ |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 612 | if (message->state == RUNNING_STATE) { |
| 613 | previous = list_entry(transfer->transfer_list.prev, |
| 614 | struct spi_transfer, |
| 615 | transfer_list); |
| 616 | if (previous->delay_usecs) |
| 617 | udelay(previous->delay_usecs); |
Ned Forrester | 8423597 | 2008-09-13 02:33:17 -0700 | [diff] [blame] | 618 | |
| 619 | /* Drop chip select only if cs_change is requested */ |
| 620 | if (previous->cs_change) |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 621 | cs_deassert(drv_data); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 622 | } |
| 623 | |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 624 | /* Check if we can DMA this transfer */ |
| 625 | if (!pxa2xx_spi_dma_is_possible(transfer->len) && chip->enable_dma) { |
Ned Forrester | 7e96445 | 2008-09-13 02:33:18 -0700 | [diff] [blame] | 626 | |
| 627 | /* reject already-mapped transfers; PIO won't always work */ |
| 628 | if (message->is_dma_mapped |
| 629 | || transfer->rx_dma || transfer->tx_dma) { |
| 630 | dev_err(&drv_data->pdev->dev, |
| 631 | "pump_transfers: mapped transfer length " |
Mike Rapoport | 20b918d | 2008-10-01 10:39:24 -0700 | [diff] [blame] | 632 | "of %u is greater than %d\n", |
Ned Forrester | 7e96445 | 2008-09-13 02:33:18 -0700 | [diff] [blame] | 633 | transfer->len, MAX_DMA_LEN); |
| 634 | message->status = -EINVAL; |
| 635 | giveback(drv_data); |
| 636 | return; |
| 637 | } |
| 638 | |
| 639 | /* warn ... we force this to PIO mode */ |
| 640 | if (printk_ratelimit()) |
| 641 | dev_warn(&message->spi->dev, "pump_transfers: " |
| 642 | "DMA disabled for transfer length %ld " |
| 643 | "greater than %d\n", |
| 644 | (long)drv_data->len, MAX_DMA_LEN); |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 645 | } |
| 646 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 647 | /* Setup the transfer state based on the type of transfer */ |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 648 | if (pxa2xx_spi_flush(drv_data) == 0) { |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 649 | dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n"); |
| 650 | message->status = -EIO; |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 651 | giveback(drv_data); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 652 | return; |
| 653 | } |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 654 | drv_data->n_bytes = chip->n_bytes; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 655 | drv_data->tx = (void *)transfer->tx_buf; |
| 656 | drv_data->tx_end = drv_data->tx + transfer->len; |
| 657 | drv_data->rx = transfer->rx_buf; |
| 658 | drv_data->rx_end = drv_data->rx + transfer->len; |
| 659 | drv_data->rx_dma = transfer->rx_dma; |
| 660 | drv_data->tx_dma = transfer->tx_dma; |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 661 | drv_data->len = transfer->len; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 662 | drv_data->write = drv_data->tx ? chip->write : null_writer; |
| 663 | drv_data->read = drv_data->rx ? chip->read : null_reader; |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 664 | |
| 665 | /* Change speed and bit per word on a per transfer */ |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 666 | cr0 = chip->cr0; |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 667 | if (transfer->speed_hz || transfer->bits_per_word) { |
| 668 | |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 669 | bits = chip->bits_per_word; |
| 670 | speed = chip->speed_hz; |
| 671 | |
| 672 | if (transfer->speed_hz) |
| 673 | speed = transfer->speed_hz; |
| 674 | |
| 675 | if (transfer->bits_per_word) |
| 676 | bits = transfer->bits_per_word; |
| 677 | |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 678 | clk_div = ssp_get_clk_div(drv_data, speed); |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 679 | |
| 680 | if (bits <= 8) { |
| 681 | drv_data->n_bytes = 1; |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 682 | drv_data->read = drv_data->read != null_reader ? |
| 683 | u8_reader : null_reader; |
| 684 | drv_data->write = drv_data->write != null_writer ? |
| 685 | u8_writer : null_writer; |
| 686 | } else if (bits <= 16) { |
| 687 | drv_data->n_bytes = 2; |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 688 | drv_data->read = drv_data->read != null_reader ? |
| 689 | u16_reader : null_reader; |
| 690 | drv_data->write = drv_data->write != null_writer ? |
| 691 | u16_writer : null_writer; |
| 692 | } else if (bits <= 32) { |
| 693 | drv_data->n_bytes = 4; |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 694 | drv_data->read = drv_data->read != null_reader ? |
| 695 | u32_reader : null_reader; |
| 696 | drv_data->write = drv_data->write != null_writer ? |
| 697 | u32_writer : null_writer; |
| 698 | } |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 699 | /* if bits/word is changed in dma mode, then must check the |
| 700 | * thresholds and burst also */ |
| 701 | if (chip->enable_dma) { |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 702 | if (pxa2xx_spi_set_dma_burst_and_threshold(chip, |
| 703 | message->spi, |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 704 | bits, &dma_burst, |
| 705 | &dma_thresh)) |
| 706 | if (printk_ratelimit()) |
| 707 | dev_warn(&message->spi->dev, |
Ned Forrester | 7e96445 | 2008-09-13 02:33:18 -0700 | [diff] [blame] | 708 | "pump_transfers: " |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 709 | "DMA burst size reduced to " |
| 710 | "match bits_per_word\n"); |
| 711 | } |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 712 | |
| 713 | cr0 = clk_div |
| 714 | | SSCR0_Motorola |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 715 | | SSCR0_DataSize(bits > 16 ? bits - 16 : bits) |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 716 | | SSCR0_SSE |
| 717 | | (bits > 16 ? SSCR0_EDSS : 0); |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 718 | } |
| 719 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 720 | message->state = RUNNING_STATE; |
| 721 | |
Ned Forrester | 7e96445 | 2008-09-13 02:33:18 -0700 | [diff] [blame] | 722 | drv_data->dma_mapped = 0; |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 723 | if (pxa2xx_spi_dma_is_possible(drv_data->len)) |
| 724 | drv_data->dma_mapped = pxa2xx_spi_map_dma_buffers(drv_data); |
Ned Forrester | 7e96445 | 2008-09-13 02:33:18 -0700 | [diff] [blame] | 725 | if (drv_data->dma_mapped) { |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 726 | |
| 727 | /* Ensure we have the correct interrupt handler */ |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 728 | drv_data->transfer_handler = pxa2xx_spi_dma_transfer; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 729 | |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 730 | pxa2xx_spi_dma_prepare(drv_data, dma_burst); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 731 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 732 | /* Clear status and start DMA engine */ |
| 733 | cr1 = chip->cr1 | dma_thresh | drv_data->dma_cr1; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 734 | write_SSSR(drv_data->clear_sr, reg); |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 735 | |
| 736 | pxa2xx_spi_dma_start(drv_data); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 737 | } else { |
| 738 | /* Ensure we have the correct interrupt handler */ |
| 739 | drv_data->transfer_handler = interrupt_transfer; |
| 740 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 741 | /* Clear status */ |
| 742 | cr1 = chip->cr1 | chip->threshold | drv_data->int_cr1; |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 743 | write_SSSR_CS(drv_data, drv_data->clear_sr); |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 744 | } |
| 745 | |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 746 | if (is_lpss_ssp(drv_data)) { |
| 747 | if ((read_SSIRF(reg) & 0xff) != chip->lpss_rx_threshold) |
| 748 | write_SSIRF(chip->lpss_rx_threshold, reg); |
| 749 | if ((read_SSITF(reg) & 0xffff) != chip->lpss_tx_threshold) |
| 750 | write_SSITF(chip->lpss_tx_threshold, reg); |
| 751 | } |
| 752 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 753 | /* see if we need to reload the config registers */ |
| 754 | if ((read_SSCR0(reg) != cr0) |
| 755 | || (read_SSCR1(reg) & SSCR1_CHANGE_MASK) != |
| 756 | (cr1 & SSCR1_CHANGE_MASK)) { |
| 757 | |
Ned Forrester | b97c74b | 2008-02-23 15:23:40 -0800 | [diff] [blame] | 758 | /* stop the SSP, and update the other bits */ |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 759 | write_SSCR0(cr0 & ~SSCR0_SSE, reg); |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 760 | if (!pxa25x_ssp_comp(drv_data)) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 761 | write_SSTO(chip->timeout, reg); |
Ned Forrester | b97c74b | 2008-02-23 15:23:40 -0800 | [diff] [blame] | 762 | /* first set CR1 without interrupt and service enables */ |
| 763 | write_SSCR1(cr1 & SSCR1_CHANGE_MASK, reg); |
| 764 | /* restart the SSP */ |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 765 | write_SSCR0(cr0, reg); |
Ned Forrester | b97c74b | 2008-02-23 15:23:40 -0800 | [diff] [blame] | 766 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 767 | } else { |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 768 | if (!pxa25x_ssp_comp(drv_data)) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 769 | write_SSTO(chip->timeout, reg); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 770 | } |
Ned Forrester | b97c74b | 2008-02-23 15:23:40 -0800 | [diff] [blame] | 771 | |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 772 | cs_assert(drv_data); |
Ned Forrester | b97c74b | 2008-02-23 15:23:40 -0800 | [diff] [blame] | 773 | |
| 774 | /* after chip select, release the data by enabling service |
| 775 | * requests and interrupts, without changing any mode bits */ |
| 776 | write_SSCR1(cr1, reg); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 777 | } |
| 778 | |
Mika Westerberg | 7f86bde | 2013-01-22 12:26:26 +0200 | [diff] [blame] | 779 | static int pxa2xx_spi_transfer_one_message(struct spi_master *master, |
| 780 | struct spi_message *msg) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 781 | { |
Mika Westerberg | 7f86bde | 2013-01-22 12:26:26 +0200 | [diff] [blame] | 782 | struct driver_data *drv_data = spi_master_get_devdata(master); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 783 | |
Mika Westerberg | 7f86bde | 2013-01-22 12:26:26 +0200 | [diff] [blame] | 784 | drv_data->cur_msg = msg; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 785 | /* Initial message state*/ |
| 786 | drv_data->cur_msg->state = START_STATE; |
| 787 | drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next, |
| 788 | struct spi_transfer, |
| 789 | transfer_list); |
| 790 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 791 | /* prepare to setup the SSP, in pump_transfers, using the per |
| 792 | * chip configuration */ |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 793 | drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 794 | |
| 795 | /* Mark as busy and launch transfers */ |
| 796 | tasklet_schedule(&drv_data->pump_transfers); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 797 | return 0; |
| 798 | } |
| 799 | |
Mika Westerberg | 7d94a50 | 2013-01-22 12:26:30 +0200 | [diff] [blame] | 800 | static int pxa2xx_spi_prepare_transfer(struct spi_master *master) |
| 801 | { |
| 802 | struct driver_data *drv_data = spi_master_get_devdata(master); |
| 803 | |
| 804 | pm_runtime_get_sync(&drv_data->pdev->dev); |
| 805 | return 0; |
| 806 | } |
| 807 | |
| 808 | static int pxa2xx_spi_unprepare_transfer(struct spi_master *master) |
| 809 | { |
| 810 | struct driver_data *drv_data = spi_master_get_devdata(master); |
| 811 | |
| 812 | /* Disable the SSP now */ |
| 813 | write_SSCR0(read_SSCR0(drv_data->ioaddr) & ~SSCR0_SSE, |
| 814 | drv_data->ioaddr); |
| 815 | |
| 816 | pm_runtime_mark_last_busy(&drv_data->pdev->dev); |
| 817 | pm_runtime_put_autosuspend(&drv_data->pdev->dev); |
| 818 | return 0; |
| 819 | } |
| 820 | |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 821 | static int setup_cs(struct spi_device *spi, struct chip_data *chip, |
| 822 | struct pxa2xx_spi_chip *chip_info) |
| 823 | { |
| 824 | int err = 0; |
| 825 | |
| 826 | if (chip == NULL || chip_info == NULL) |
| 827 | return 0; |
| 828 | |
| 829 | /* NOTE: setup() can be called multiple times, possibly with |
| 830 | * different chip_info, release previously requested GPIO |
| 831 | */ |
| 832 | if (gpio_is_valid(chip->gpio_cs)) |
| 833 | gpio_free(chip->gpio_cs); |
| 834 | |
| 835 | /* If (*cs_control) is provided, ignore GPIO chip select */ |
| 836 | if (chip_info->cs_control) { |
| 837 | chip->cs_control = chip_info->cs_control; |
| 838 | return 0; |
| 839 | } |
| 840 | |
| 841 | if (gpio_is_valid(chip_info->gpio_cs)) { |
| 842 | err = gpio_request(chip_info->gpio_cs, "SPI_CS"); |
| 843 | if (err) { |
| 844 | dev_err(&spi->dev, "failed to request chip select " |
| 845 | "GPIO%d\n", chip_info->gpio_cs); |
| 846 | return err; |
| 847 | } |
| 848 | |
| 849 | chip->gpio_cs = chip_info->gpio_cs; |
| 850 | chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH; |
| 851 | |
| 852 | err = gpio_direction_output(chip->gpio_cs, |
| 853 | !chip->gpio_cs_inverted); |
| 854 | } |
| 855 | |
| 856 | return err; |
| 857 | } |
| 858 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 859 | static int setup(struct spi_device *spi) |
| 860 | { |
| 861 | struct pxa2xx_spi_chip *chip_info = NULL; |
| 862 | struct chip_data *chip; |
| 863 | struct driver_data *drv_data = spi_master_get_devdata(spi->master); |
| 864 | unsigned int clk_div; |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 865 | uint tx_thres, tx_hi_thres, rx_thres; |
| 866 | |
| 867 | if (is_lpss_ssp(drv_data)) { |
| 868 | tx_thres = LPSS_TX_LOTHRESH_DFLT; |
| 869 | tx_hi_thres = LPSS_TX_HITHRESH_DFLT; |
| 870 | rx_thres = LPSS_RX_THRESH_DFLT; |
| 871 | } else { |
| 872 | tx_thres = TX_THRESH_DFLT; |
| 873 | tx_hi_thres = 0; |
| 874 | rx_thres = RX_THRESH_DFLT; |
| 875 | } |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 876 | |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 877 | if (!pxa25x_ssp_comp(drv_data) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 878 | && (spi->bits_per_word < 4 || spi->bits_per_word > 32)) { |
| 879 | dev_err(&spi->dev, "failed setup: ssp_type=%d, bits/wrd=%d " |
| 880 | "b/w not 4-32 for type non-PXA25x_SSP\n", |
| 881 | drv_data->ssp_type, spi->bits_per_word); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 882 | return -EINVAL; |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 883 | } else if (pxa25x_ssp_comp(drv_data) |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 884 | && (spi->bits_per_word < 4 |
| 885 | || spi->bits_per_word > 16)) { |
| 886 | dev_err(&spi->dev, "failed setup: ssp_type=%d, bits/wrd=%d " |
| 887 | "b/w not 4-16 for type PXA25x_SSP\n", |
| 888 | drv_data->ssp_type, spi->bits_per_word); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 889 | return -EINVAL; |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 890 | } |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 891 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 892 | /* Only alloc on first setup */ |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 893 | chip = spi_get_ctldata(spi); |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 894 | if (!chip) { |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 895 | chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 896 | if (!chip) { |
| 897 | dev_err(&spi->dev, |
| 898 | "failed setup: can't allocate chip data\n"); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 899 | return -ENOMEM; |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 900 | } |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 901 | |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 902 | if (drv_data->ssp_type == CE4100_SSP) { |
| 903 | if (spi->chip_select > 4) { |
| 904 | dev_err(&spi->dev, "failed setup: " |
| 905 | "cs number must not be > 4.\n"); |
| 906 | kfree(chip); |
| 907 | return -EINVAL; |
| 908 | } |
| 909 | |
| 910 | chip->frm = spi->chip_select; |
| 911 | } else |
| 912 | chip->gpio_cs = -1; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 913 | chip->enable_dma = 0; |
Vernon Sauder | f1f640a | 2008-10-15 22:02:43 -0700 | [diff] [blame] | 914 | chip->timeout = TIMOUT_DFLT; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 915 | } |
| 916 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 917 | /* protocol drivers may change the chip settings, so... |
| 918 | * if chip_info exists, use it */ |
| 919 | chip_info = spi->controller_data; |
| 920 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 921 | /* chip_info isn't always needed */ |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 922 | chip->cr1 = 0; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 923 | if (chip_info) { |
Vernon Sauder | f1f640a | 2008-10-15 22:02:43 -0700 | [diff] [blame] | 924 | if (chip_info->timeout) |
| 925 | chip->timeout = chip_info->timeout; |
| 926 | if (chip_info->tx_threshold) |
| 927 | tx_thres = chip_info->tx_threshold; |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 928 | if (chip_info->tx_hi_threshold) |
| 929 | tx_hi_thres = chip_info->tx_hi_threshold; |
Vernon Sauder | f1f640a | 2008-10-15 22:02:43 -0700 | [diff] [blame] | 930 | if (chip_info->rx_threshold) |
| 931 | rx_thres = chip_info->rx_threshold; |
| 932 | chip->enable_dma = drv_data->master_info->enable_dma; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 933 | chip->dma_threshold = 0; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 934 | if (chip_info->enable_loopback) |
| 935 | chip->cr1 = SSCR1_LBM; |
| 936 | } |
| 937 | |
Vernon Sauder | f1f640a | 2008-10-15 22:02:43 -0700 | [diff] [blame] | 938 | chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) | |
| 939 | (SSCR1_TxTresh(tx_thres) & SSCR1_TFT); |
| 940 | |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 941 | chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres); |
| 942 | chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres) |
| 943 | | SSITF_TxHiThresh(tx_hi_thres); |
| 944 | |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 945 | /* set dma burst and threshold outside of chip_info path so that if |
| 946 | * chip_info goes away after setting chip->enable_dma, the |
| 947 | * burst and threshold can still respond to changes in bits_per_word */ |
| 948 | if (chip->enable_dma) { |
| 949 | /* set up legal burst and threshold for dma */ |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 950 | if (pxa2xx_spi_set_dma_burst_and_threshold(chip, spi, |
| 951 | spi->bits_per_word, |
Stephen Street | 8d94cc5 | 2006-12-10 02:18:54 -0800 | [diff] [blame] | 952 | &chip->dma_burst_size, |
| 953 | &chip->dma_threshold)) { |
| 954 | dev_warn(&spi->dev, "in setup: DMA burst size reduced " |
| 955 | "to match bits_per_word\n"); |
| 956 | } |
| 957 | } |
| 958 | |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 959 | clk_div = ssp_get_clk_div(drv_data, spi->max_speed_hz); |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 960 | chip->speed_hz = spi->max_speed_hz; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 961 | |
| 962 | chip->cr0 = clk_div |
| 963 | | SSCR0_Motorola |
Stephen Street | 5daa3ba | 2006-05-20 15:00:19 -0700 | [diff] [blame] | 964 | | SSCR0_DataSize(spi->bits_per_word > 16 ? |
| 965 | spi->bits_per_word - 16 : spi->bits_per_word) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 966 | | SSCR0_SSE |
| 967 | | (spi->bits_per_word > 16 ? SSCR0_EDSS : 0); |
Justin Clacherty | 7f6ee1a | 2007-01-26 00:56:44 -0800 | [diff] [blame] | 968 | chip->cr1 &= ~(SSCR1_SPO | SSCR1_SPH); |
| 969 | chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0) |
| 970 | | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 971 | |
Mika Westerberg | b833172 | 2013-01-22 12:26:31 +0200 | [diff] [blame] | 972 | if (spi->mode & SPI_LOOP) |
| 973 | chip->cr1 |= SSCR1_LBM; |
| 974 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 975 | /* NOTE: PXA25x_SSP _could_ use external clocking ... */ |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 976 | if (!pxa25x_ssp_comp(drv_data)) |
David Brownell | 7d07719 | 2009-06-17 16:26:03 -0700 | [diff] [blame] | 977 | dev_dbg(&spi->dev, "%ld Hz actual, %s\n", |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 978 | drv_data->max_clk_rate |
Eric Miao | c9840da | 2010-03-16 16:48:01 +0800 | [diff] [blame] | 979 | / (1 + ((chip->cr0 & SSCR0_SCR(0xfff)) >> 8)), |
| 980 | chip->enable_dma ? "DMA" : "PIO"); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 981 | else |
David Brownell | 7d07719 | 2009-06-17 16:26:03 -0700 | [diff] [blame] | 982 | dev_dbg(&spi->dev, "%ld Hz actual, %s\n", |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 983 | drv_data->max_clk_rate / 2 |
Eric Miao | c9840da | 2010-03-16 16:48:01 +0800 | [diff] [blame] | 984 | / (1 + ((chip->cr0 & SSCR0_SCR(0x0ff)) >> 8)), |
| 985 | chip->enable_dma ? "DMA" : "PIO"); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 986 | |
| 987 | if (spi->bits_per_word <= 8) { |
| 988 | chip->n_bytes = 1; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 989 | chip->read = u8_reader; |
| 990 | chip->write = u8_writer; |
| 991 | } else if (spi->bits_per_word <= 16) { |
| 992 | chip->n_bytes = 2; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 993 | chip->read = u16_reader; |
| 994 | chip->write = u16_writer; |
| 995 | } else if (spi->bits_per_word <= 32) { |
| 996 | chip->cr0 |= SSCR0_EDSS; |
| 997 | chip->n_bytes = 4; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 998 | chip->read = u32_reader; |
| 999 | chip->write = u32_writer; |
| 1000 | } else { |
| 1001 | dev_err(&spi->dev, "invalid wordsize\n"); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1002 | return -ENODEV; |
| 1003 | } |
Stephen Street | 9708c12 | 2006-03-28 14:05:23 -0800 | [diff] [blame] | 1004 | chip->bits_per_word = spi->bits_per_word; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1005 | |
| 1006 | spi_set_ctldata(spi, chip); |
| 1007 | |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 1008 | if (drv_data->ssp_type == CE4100_SSP) |
| 1009 | return 0; |
| 1010 | |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 1011 | return setup_cs(spi, chip, chip_info); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1012 | } |
| 1013 | |
Hans-Peter Nilsson | 0ffa028 | 2007-02-12 00:52:45 -0800 | [diff] [blame] | 1014 | static void cleanup(struct spi_device *spi) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1015 | { |
Hans-Peter Nilsson | 0ffa028 | 2007-02-12 00:52:45 -0800 | [diff] [blame] | 1016 | struct chip_data *chip = spi_get_ctldata(spi); |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 1017 | struct driver_data *drv_data = spi_master_get_devdata(spi->master); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1018 | |
Daniel Ribeiro | 7348d82 | 2009-05-12 13:19:36 -0700 | [diff] [blame] | 1019 | if (!chip) |
| 1020 | return; |
| 1021 | |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 1022 | if (drv_data->ssp_type != CE4100_SSP && gpio_is_valid(chip->gpio_cs)) |
Eric Miao | a7bb390 | 2009-04-06 19:00:54 -0700 | [diff] [blame] | 1023 | gpio_free(chip->gpio_cs); |
| 1024 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1025 | kfree(chip); |
| 1026 | } |
| 1027 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 1028 | static int pxa2xx_spi_probe(struct platform_device *pdev) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1029 | { |
| 1030 | struct device *dev = &pdev->dev; |
| 1031 | struct pxa2xx_spi_master *platform_info; |
| 1032 | struct spi_master *master; |
Guennadi Liakhovetski | 65a00a2 | 2008-10-15 22:02:42 -0700 | [diff] [blame] | 1033 | struct driver_data *drv_data; |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 1034 | struct ssp_device *ssp; |
Guennadi Liakhovetski | 65a00a2 | 2008-10-15 22:02:42 -0700 | [diff] [blame] | 1035 | int status; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1036 | |
Mika Westerberg | 851bacf | 2013-01-07 12:44:33 +0200 | [diff] [blame] | 1037 | platform_info = dev_get_platdata(dev); |
| 1038 | if (!platform_info) { |
| 1039 | dev_err(&pdev->dev, "missing platform data\n"); |
| 1040 | return -ENODEV; |
| 1041 | } |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1042 | |
Haojian Zhuang | baffe16 | 2010-05-05 10:11:15 -0400 | [diff] [blame] | 1043 | ssp = pxa_ssp_request(pdev->id, pdev->name); |
Mika Westerberg | 851bacf | 2013-01-07 12:44:33 +0200 | [diff] [blame] | 1044 | if (!ssp) |
| 1045 | ssp = &platform_info->ssp; |
| 1046 | |
| 1047 | if (!ssp->mmio_base) { |
| 1048 | dev_err(&pdev->dev, "failed to get ssp\n"); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1049 | return -ENODEV; |
| 1050 | } |
| 1051 | |
| 1052 | /* Allocate master with space for drv_data and null dma buffer */ |
| 1053 | master = spi_alloc_master(dev, sizeof(struct driver_data) + 16); |
| 1054 | if (!master) { |
Guennadi Liakhovetski | 65a00a2 | 2008-10-15 22:02:42 -0700 | [diff] [blame] | 1055 | dev_err(&pdev->dev, "cannot alloc spi_master\n"); |
Haojian Zhuang | baffe16 | 2010-05-05 10:11:15 -0400 | [diff] [blame] | 1056 | pxa_ssp_free(ssp); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1057 | return -ENOMEM; |
| 1058 | } |
| 1059 | drv_data = spi_master_get_devdata(master); |
| 1060 | drv_data->master = master; |
| 1061 | drv_data->master_info = platform_info; |
| 1062 | drv_data->pdev = pdev; |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 1063 | drv_data->ssp = ssp; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1064 | |
Sebastian Andrzej Siewior | 21486af | 2010-10-08 18:11:19 +0200 | [diff] [blame] | 1065 | master->dev.parent = &pdev->dev; |
Sebastian Andrzej Siewior | 21486af | 2010-10-08 18:11:19 +0200 | [diff] [blame] | 1066 | master->dev.of_node = pdev->dev.of_node; |
David Brownell | e7db06b | 2009-06-17 16:26:04 -0700 | [diff] [blame] | 1067 | /* the spi->mode bits understood by this driver: */ |
Mika Westerberg | b833172 | 2013-01-22 12:26:31 +0200 | [diff] [blame] | 1068 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP; |
David Brownell | e7db06b | 2009-06-17 16:26:04 -0700 | [diff] [blame] | 1069 | |
Mika Westerberg | 851bacf | 2013-01-07 12:44:33 +0200 | [diff] [blame] | 1070 | master->bus_num = ssp->port_id; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1071 | master->num_chipselect = platform_info->num_chipselect; |
Mike Rapoport | 7ad0ba9 | 2009-04-06 19:00:57 -0700 | [diff] [blame] | 1072 | master->dma_alignment = DMA_ALIGNMENT; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1073 | master->cleanup = cleanup; |
| 1074 | master->setup = setup; |
Mika Westerberg | 7f86bde | 2013-01-22 12:26:26 +0200 | [diff] [blame] | 1075 | master->transfer_one_message = pxa2xx_spi_transfer_one_message; |
Mika Westerberg | 7d94a50 | 2013-01-22 12:26:30 +0200 | [diff] [blame] | 1076 | master->prepare_transfer_hardware = pxa2xx_spi_prepare_transfer; |
| 1077 | master->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1078 | |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 1079 | drv_data->ssp_type = ssp->type; |
Mika Westerberg | 2b9b84f | 2013-01-22 12:26:25 +0200 | [diff] [blame] | 1080 | drv_data->null_dma_buf = (u32 *)PTR_ALIGN(&drv_data[1], DMA_ALIGNMENT); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1081 | |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 1082 | drv_data->ioaddr = ssp->mmio_base; |
| 1083 | drv_data->ssdr_physical = ssp->phys_base + SSDR; |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 1084 | if (pxa25x_ssp_comp(drv_data)) { |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1085 | drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE; |
| 1086 | drv_data->dma_cr1 = 0; |
| 1087 | drv_data->clear_sr = SSSR_ROR; |
| 1088 | drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR; |
| 1089 | } else { |
| 1090 | drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE; |
Mika Westerberg | 5928808 | 2013-01-22 12:26:29 +0200 | [diff] [blame] | 1091 | drv_data->dma_cr1 = DEFAULT_DMA_CR1; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1092 | drv_data->clear_sr = SSSR_ROR | SSSR_TINT; |
| 1093 | drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR; |
| 1094 | } |
| 1095 | |
Sebastian Andrzej Siewior | 49cbb1e | 2010-11-22 17:12:14 -0800 | [diff] [blame] | 1096 | status = request_irq(ssp->irq, ssp_int, IRQF_SHARED, dev_name(dev), |
| 1097 | drv_data); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1098 | if (status < 0) { |
Guennadi Liakhovetski | 65a00a2 | 2008-10-15 22:02:42 -0700 | [diff] [blame] | 1099 | dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1100 | goto out_error_master_alloc; |
| 1101 | } |
| 1102 | |
| 1103 | /* Setup DMA if requested */ |
| 1104 | drv_data->tx_channel = -1; |
| 1105 | drv_data->rx_channel = -1; |
| 1106 | if (platform_info->enable_dma) { |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 1107 | status = pxa2xx_spi_dma_setup(drv_data); |
| 1108 | if (status) { |
| 1109 | dev_warn(dev, "failed to setup DMA, using PIO\n"); |
| 1110 | platform_info->enable_dma = false; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1111 | } |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1112 | } |
| 1113 | |
| 1114 | /* Enable SOC clock */ |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 1115 | clk_prepare_enable(ssp->clk); |
| 1116 | |
| 1117 | drv_data->max_clk_rate = clk_get_rate(ssp->clk); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1118 | |
| 1119 | /* Load default SSP configuration */ |
| 1120 | write_SSCR0(0, drv_data->ioaddr); |
Vernon Sauder | f1f640a | 2008-10-15 22:02:43 -0700 | [diff] [blame] | 1121 | write_SSCR1(SSCR1_RxTresh(RX_THRESH_DFLT) | |
| 1122 | SSCR1_TxTresh(TX_THRESH_DFLT), |
| 1123 | drv_data->ioaddr); |
Eric Miao | c9840da | 2010-03-16 16:48:01 +0800 | [diff] [blame] | 1124 | write_SSCR0(SSCR0_SCR(2) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1125 | | SSCR0_Motorola |
| 1126 | | SSCR0_DataSize(8), |
| 1127 | drv_data->ioaddr); |
Sebastian Andrzej Siewior | 2a8626a | 2010-11-22 17:12:17 -0800 | [diff] [blame] | 1128 | if (!pxa25x_ssp_comp(drv_data)) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1129 | write_SSTO(0, drv_data->ioaddr); |
| 1130 | write_SSPSP(0, drv_data->ioaddr); |
| 1131 | |
Mika Westerberg | a0d2642 | 2013-01-22 12:26:32 +0200 | [diff] [blame^] | 1132 | lpss_ssp_setup(drv_data); |
| 1133 | |
Mika Westerberg | 7f86bde | 2013-01-22 12:26:26 +0200 | [diff] [blame] | 1134 | tasklet_init(&drv_data->pump_transfers, pump_transfers, |
| 1135 | (unsigned long)drv_data); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1136 | |
| 1137 | /* Register with the SPI framework */ |
| 1138 | platform_set_drvdata(pdev, drv_data); |
| 1139 | status = spi_register_master(master); |
| 1140 | if (status != 0) { |
| 1141 | dev_err(&pdev->dev, "problem registering spi master\n"); |
Mika Westerberg | 7f86bde | 2013-01-22 12:26:26 +0200 | [diff] [blame] | 1142 | goto out_error_clock_enabled; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1143 | } |
| 1144 | |
Mika Westerberg | 7d94a50 | 2013-01-22 12:26:30 +0200 | [diff] [blame] | 1145 | pm_runtime_set_autosuspend_delay(&pdev->dev, 50); |
| 1146 | pm_runtime_use_autosuspend(&pdev->dev); |
| 1147 | pm_runtime_set_active(&pdev->dev); |
| 1148 | pm_runtime_enable(&pdev->dev); |
| 1149 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1150 | return status; |
| 1151 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1152 | out_error_clock_enabled: |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 1153 | clk_disable_unprepare(ssp->clk); |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 1154 | pxa2xx_spi_dma_release(drv_data); |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 1155 | free_irq(ssp->irq, drv_data); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1156 | |
| 1157 | out_error_master_alloc: |
| 1158 | spi_master_put(master); |
Haojian Zhuang | baffe16 | 2010-05-05 10:11:15 -0400 | [diff] [blame] | 1159 | pxa_ssp_free(ssp); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1160 | return status; |
| 1161 | } |
| 1162 | |
| 1163 | static int pxa2xx_spi_remove(struct platform_device *pdev) |
| 1164 | { |
| 1165 | struct driver_data *drv_data = platform_get_drvdata(pdev); |
Julia Lawall | 51e911e | 2009-01-06 14:41:45 -0800 | [diff] [blame] | 1166 | struct ssp_device *ssp; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1167 | |
| 1168 | if (!drv_data) |
| 1169 | return 0; |
Julia Lawall | 51e911e | 2009-01-06 14:41:45 -0800 | [diff] [blame] | 1170 | ssp = drv_data->ssp; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1171 | |
Mika Westerberg | 7d94a50 | 2013-01-22 12:26:30 +0200 | [diff] [blame] | 1172 | pm_runtime_get_sync(&pdev->dev); |
| 1173 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1174 | /* Disable the SSP at the peripheral and SOC level */ |
| 1175 | write_SSCR0(0, drv_data->ioaddr); |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 1176 | clk_disable_unprepare(ssp->clk); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1177 | |
| 1178 | /* Release DMA */ |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 1179 | if (drv_data->master_info->enable_dma) |
| 1180 | pxa2xx_spi_dma_release(drv_data); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1181 | |
Mika Westerberg | 7d94a50 | 2013-01-22 12:26:30 +0200 | [diff] [blame] | 1182 | pm_runtime_put_noidle(&pdev->dev); |
| 1183 | pm_runtime_disable(&pdev->dev); |
| 1184 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1185 | /* Release IRQ */ |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 1186 | free_irq(ssp->irq, drv_data); |
| 1187 | |
| 1188 | /* Release SSP */ |
Haojian Zhuang | baffe16 | 2010-05-05 10:11:15 -0400 | [diff] [blame] | 1189 | pxa_ssp_free(ssp); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1190 | |
| 1191 | /* Disconnect from the SPI framework */ |
| 1192 | spi_unregister_master(drv_data->master); |
| 1193 | |
| 1194 | /* Prevent double remove */ |
| 1195 | platform_set_drvdata(pdev, NULL); |
| 1196 | |
| 1197 | return 0; |
| 1198 | } |
| 1199 | |
| 1200 | static void pxa2xx_spi_shutdown(struct platform_device *pdev) |
| 1201 | { |
| 1202 | int status = 0; |
| 1203 | |
| 1204 | if ((status = pxa2xx_spi_remove(pdev)) != 0) |
| 1205 | dev_err(&pdev->dev, "shutdown failed with %d\n", status); |
| 1206 | } |
| 1207 | |
| 1208 | #ifdef CONFIG_PM |
Mike Rapoport | 86d2593 | 2009-07-21 17:50:16 +0300 | [diff] [blame] | 1209 | static int pxa2xx_spi_suspend(struct device *dev) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1210 | { |
Mike Rapoport | 86d2593 | 2009-07-21 17:50:16 +0300 | [diff] [blame] | 1211 | struct driver_data *drv_data = dev_get_drvdata(dev); |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 1212 | struct ssp_device *ssp = drv_data->ssp; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1213 | int status = 0; |
| 1214 | |
Mika Westerberg | 7f86bde | 2013-01-22 12:26:26 +0200 | [diff] [blame] | 1215 | status = spi_master_suspend(drv_data->master); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1216 | if (status != 0) |
| 1217 | return status; |
| 1218 | write_SSCR0(0, drv_data->ioaddr); |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 1219 | clk_disable_unprepare(ssp->clk); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1220 | |
| 1221 | return 0; |
| 1222 | } |
| 1223 | |
Mike Rapoport | 86d2593 | 2009-07-21 17:50:16 +0300 | [diff] [blame] | 1224 | static int pxa2xx_spi_resume(struct device *dev) |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1225 | { |
Mike Rapoport | 86d2593 | 2009-07-21 17:50:16 +0300 | [diff] [blame] | 1226 | struct driver_data *drv_data = dev_get_drvdata(dev); |
eric miao | 2f1a74e | 2007-11-21 18:50:53 +0800 | [diff] [blame] | 1227 | struct ssp_device *ssp = drv_data->ssp; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1228 | int status = 0; |
| 1229 | |
Mika Westerberg | cd7bed0 | 2013-01-22 12:26:28 +0200 | [diff] [blame] | 1230 | pxa2xx_spi_dma_resume(drv_data); |
Daniel Ribeiro | 148da33 | 2009-04-21 12:24:43 -0700 | [diff] [blame] | 1231 | |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1232 | /* Enable the SSP clock */ |
Mika Westerberg | 3343b7a | 2013-01-22 12:26:27 +0200 | [diff] [blame] | 1233 | clk_prepare_enable(ssp->clk); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1234 | |
| 1235 | /* Start the queue running */ |
Mika Westerberg | 7f86bde | 2013-01-22 12:26:26 +0200 | [diff] [blame] | 1236 | status = spi_master_resume(drv_data->master); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1237 | if (status != 0) { |
Mike Rapoport | 86d2593 | 2009-07-21 17:50:16 +0300 | [diff] [blame] | 1238 | dev_err(dev, "problem starting queue (%d)\n", status); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1239 | return status; |
| 1240 | } |
| 1241 | |
| 1242 | return 0; |
| 1243 | } |
Mika Westerberg | 7d94a50 | 2013-01-22 12:26:30 +0200 | [diff] [blame] | 1244 | #endif |
| 1245 | |
| 1246 | #ifdef CONFIG_PM_RUNTIME |
| 1247 | static int pxa2xx_spi_runtime_suspend(struct device *dev) |
| 1248 | { |
| 1249 | struct driver_data *drv_data = dev_get_drvdata(dev); |
| 1250 | |
| 1251 | clk_disable_unprepare(drv_data->ssp->clk); |
| 1252 | return 0; |
| 1253 | } |
| 1254 | |
| 1255 | static int pxa2xx_spi_runtime_resume(struct device *dev) |
| 1256 | { |
| 1257 | struct driver_data *drv_data = dev_get_drvdata(dev); |
| 1258 | |
| 1259 | clk_prepare_enable(drv_data->ssp->clk); |
| 1260 | return 0; |
| 1261 | } |
| 1262 | #endif |
Mike Rapoport | 86d2593 | 2009-07-21 17:50:16 +0300 | [diff] [blame] | 1263 | |
Alexey Dobriyan | 4714521 | 2009-12-14 18:00:08 -0800 | [diff] [blame] | 1264 | static const struct dev_pm_ops pxa2xx_spi_pm_ops = { |
Mika Westerberg | 7d94a50 | 2013-01-22 12:26:30 +0200 | [diff] [blame] | 1265 | SET_SYSTEM_SLEEP_PM_OPS(pxa2xx_spi_suspend, pxa2xx_spi_resume) |
| 1266 | SET_RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend, |
| 1267 | pxa2xx_spi_runtime_resume, NULL) |
Mike Rapoport | 86d2593 | 2009-07-21 17:50:16 +0300 | [diff] [blame] | 1268 | }; |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1269 | |
| 1270 | static struct platform_driver driver = { |
| 1271 | .driver = { |
Mike Rapoport | 86d2593 | 2009-07-21 17:50:16 +0300 | [diff] [blame] | 1272 | .name = "pxa2xx-spi", |
| 1273 | .owner = THIS_MODULE, |
Mike Rapoport | 86d2593 | 2009-07-21 17:50:16 +0300 | [diff] [blame] | 1274 | .pm = &pxa2xx_spi_pm_ops, |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1275 | }, |
Sebastian Andrzej Siewior | fbd29a1 | 2010-11-19 09:00:11 -0800 | [diff] [blame] | 1276 | .probe = pxa2xx_spi_probe, |
David Brownell | d1e44d9 | 2007-10-16 01:27:46 -0700 | [diff] [blame] | 1277 | .remove = pxa2xx_spi_remove, |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1278 | .shutdown = pxa2xx_spi_shutdown, |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1279 | }; |
| 1280 | |
| 1281 | static int __init pxa2xx_spi_init(void) |
| 1282 | { |
Sebastian Andrzej Siewior | fbd29a1 | 2010-11-19 09:00:11 -0800 | [diff] [blame] | 1283 | return platform_driver_register(&driver); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1284 | } |
Antonio Ospite | 5b61a74 | 2009-09-22 16:46:10 -0700 | [diff] [blame] | 1285 | subsys_initcall(pxa2xx_spi_init); |
Stephen Street | e0c9905 | 2006-03-07 23:53:24 -0800 | [diff] [blame] | 1286 | |
| 1287 | static void __exit pxa2xx_spi_exit(void) |
| 1288 | { |
| 1289 | platform_driver_unregister(&driver); |
| 1290 | } |
| 1291 | module_exit(pxa2xx_spi_exit); |