Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Freescale eSPI controller driver. |
| 3 | * |
| 4 | * Copyright 2010 Freescale Semiconductor, Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License as published by the |
| 8 | * Free Software Foundation; either version 2 of the License, or (at your |
| 9 | * option) any later version. |
| 10 | */ |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 11 | #include <linux/delay.h> |
Xiubo Li | a310836 | 2014-09-29 10:57:06 +0800 | [diff] [blame] | 12 | #include <linux/err.h> |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 13 | #include <linux/fsl_devices.h> |
Xiubo Li | a310836 | 2014-09-29 10:57:06 +0800 | [diff] [blame] | 14 | #include <linux/interrupt.h> |
Xiubo Li | a310836 | 2014-09-29 10:57:06 +0800 | [diff] [blame] | 15 | #include <linux/module.h> |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 16 | #include <linux/mm.h> |
| 17 | #include <linux/of.h> |
Rob Herring | 5af5073 | 2013-09-17 14:28:33 -0500 | [diff] [blame] | 18 | #include <linux/of_address.h> |
| 19 | #include <linux/of_irq.h> |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 20 | #include <linux/of_platform.h> |
Xiubo Li | a310836 | 2014-09-29 10:57:06 +0800 | [diff] [blame] | 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/spi/spi.h> |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 23 | #include <linux/pm_runtime.h> |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 24 | #include <sysdev/fsl_soc.h> |
| 25 | |
Grant Likely | ca632f5 | 2011-06-06 01:16:30 -0600 | [diff] [blame] | 26 | #include "spi-fsl-lib.h" |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 27 | |
| 28 | /* eSPI Controller registers */ |
| 29 | struct fsl_espi_reg { |
| 30 | __be32 mode; /* 0x000 - eSPI mode register */ |
| 31 | __be32 event; /* 0x004 - eSPI event register */ |
| 32 | __be32 mask; /* 0x008 - eSPI mask register */ |
| 33 | __be32 command; /* 0x00c - eSPI command register */ |
| 34 | __be32 transmit; /* 0x010 - eSPI transmit FIFO access register*/ |
| 35 | __be32 receive; /* 0x014 - eSPI receive FIFO access register*/ |
| 36 | u8 res[8]; /* 0x018 - 0x01c reserved */ |
| 37 | __be32 csmode[4]; /* 0x020 - 0x02c eSPI cs mode register */ |
| 38 | }; |
| 39 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 40 | /* eSPI Controller mode register definitions */ |
| 41 | #define SPMODE_ENABLE (1 << 31) |
| 42 | #define SPMODE_LOOP (1 << 30) |
| 43 | #define SPMODE_TXTHR(x) ((x) << 8) |
| 44 | #define SPMODE_RXTHR(x) ((x) << 0) |
| 45 | |
| 46 | /* eSPI Controller CS mode register definitions */ |
| 47 | #define CSMODE_CI_INACTIVEHIGH (1 << 31) |
| 48 | #define CSMODE_CP_BEGIN_EDGECLK (1 << 30) |
| 49 | #define CSMODE_REV (1 << 29) |
| 50 | #define CSMODE_DIV16 (1 << 28) |
| 51 | #define CSMODE_PM(x) ((x) << 24) |
| 52 | #define CSMODE_POL_1 (1 << 20) |
| 53 | #define CSMODE_LEN(x) ((x) << 16) |
| 54 | #define CSMODE_BEF(x) ((x) << 12) |
| 55 | #define CSMODE_AFT(x) ((x) << 8) |
| 56 | #define CSMODE_CG(x) ((x) << 3) |
| 57 | |
| 58 | /* Default mode/csmode for eSPI controller */ |
| 59 | #define SPMODE_INIT_VAL (SPMODE_TXTHR(4) | SPMODE_RXTHR(3)) |
| 60 | #define CSMODE_INIT_VAL (CSMODE_POL_1 | CSMODE_BEF(0) \ |
| 61 | | CSMODE_AFT(0) | CSMODE_CG(1)) |
| 62 | |
| 63 | /* SPIE register values */ |
| 64 | #define SPIE_NE 0x00000200 /* Not empty */ |
| 65 | #define SPIE_NF 0x00000100 /* Not full */ |
| 66 | |
| 67 | /* SPIM register values */ |
| 68 | #define SPIM_NE 0x00000200 /* Not empty */ |
| 69 | #define SPIM_NF 0x00000100 /* Not full */ |
| 70 | #define SPIE_RXCNT(reg) ((reg >> 24) & 0x3F) |
| 71 | #define SPIE_TXCNT(reg) ((reg >> 16) & 0x3F) |
| 72 | |
| 73 | /* SPCOM register values */ |
| 74 | #define SPCOM_CS(x) ((x) << 30) |
| 75 | #define SPCOM_TRANLEN(x) ((x) << 0) |
Hou Zhiqiang | 5cfa1e4 | 2016-01-22 18:58:26 +0800 | [diff] [blame] | 76 | #define SPCOM_TRANLEN_MAX 0x10000 /* Max transaction length */ |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 77 | |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 78 | #define AUTOSUSPEND_TIMEOUT 2000 |
| 79 | |
Heiner Kallweit | cce7e3a | 2016-09-07 22:54:18 +0200 | [diff] [blame] | 80 | static void fsl_espi_copy_to_buf(struct spi_message *m, |
| 81 | struct mpc8xxx_spi *mspi) |
Heiner Kallweit | 7c159aa | 2016-09-07 22:50:53 +0200 | [diff] [blame] | 82 | { |
Heiner Kallweit | 7c159aa | 2016-09-07 22:50:53 +0200 | [diff] [blame] | 83 | struct spi_transfer *t; |
| 84 | u8 *buf = mspi->local_buf; |
| 85 | |
| 86 | list_for_each_entry(t, &m->transfers, transfer_list) { |
Heiner Kallweit | cce7e3a | 2016-09-07 22:54:18 +0200 | [diff] [blame] | 87 | if (t->tx_buf) |
Heiner Kallweit | 7c159aa | 2016-09-07 22:50:53 +0200 | [diff] [blame] | 88 | memcpy(buf, t->tx_buf, t->len); |
Heiner Kallweit | cce7e3a | 2016-09-07 22:54:18 +0200 | [diff] [blame] | 89 | else |
Heiner Kallweit | 7c159aa | 2016-09-07 22:50:53 +0200 | [diff] [blame] | 90 | memset(buf, 0, t->len); |
Heiner Kallweit | 7c159aa | 2016-09-07 22:50:53 +0200 | [diff] [blame] | 91 | buf += t->len; |
| 92 | } |
Heiner Kallweit | cce7e3a | 2016-09-07 22:54:18 +0200 | [diff] [blame] | 93 | } |
Heiner Kallweit | 7c159aa | 2016-09-07 22:50:53 +0200 | [diff] [blame] | 94 | |
Heiner Kallweit | cce7e3a | 2016-09-07 22:54:18 +0200 | [diff] [blame] | 95 | static void fsl_espi_copy_from_buf(struct spi_message *m, |
| 96 | struct mpc8xxx_spi *mspi) |
| 97 | { |
| 98 | struct spi_transfer *t; |
| 99 | u8 *buf = mspi->local_buf; |
| 100 | |
| 101 | list_for_each_entry(t, &m->transfers, transfer_list) { |
| 102 | if (t->rx_buf) |
| 103 | memcpy(t->rx_buf, buf, t->len); |
| 104 | buf += t->len; |
| 105 | } |
Heiner Kallweit | 7c159aa | 2016-09-07 22:50:53 +0200 | [diff] [blame] | 106 | } |
| 107 | |
Heiner Kallweit | d3152cf1 | 2016-09-07 22:53:38 +0200 | [diff] [blame] | 108 | static int fsl_espi_check_message(struct spi_message *m) |
| 109 | { |
| 110 | struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master); |
| 111 | struct spi_transfer *t, *first; |
| 112 | |
| 113 | if (m->frame_length > SPCOM_TRANLEN_MAX) { |
| 114 | dev_err(mspi->dev, "message too long, size is %u bytes\n", |
| 115 | m->frame_length); |
| 116 | return -EMSGSIZE; |
| 117 | } |
| 118 | |
| 119 | first = list_first_entry(&m->transfers, struct spi_transfer, |
| 120 | transfer_list); |
| 121 | list_for_each_entry(t, &m->transfers, transfer_list) { |
| 122 | if (first->bits_per_word != t->bits_per_word || |
| 123 | first->speed_hz != t->speed_hz) { |
| 124 | dev_err(mspi->dev, "bits_per_word/speed_hz should be the same for all transfers\n"); |
| 125 | return -EINVAL; |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | return 0; |
| 130 | } |
| 131 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 132 | static void fsl_espi_change_mode(struct spi_device *spi) |
| 133 | { |
| 134 | struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); |
| 135 | struct spi_mpc8xxx_cs *cs = spi->controller_state; |
| 136 | struct fsl_espi_reg *reg_base = mspi->reg_base; |
| 137 | __be32 __iomem *mode = ®_base->csmode[spi->chip_select]; |
| 138 | __be32 __iomem *espi_mode = ®_base->mode; |
| 139 | u32 tmp; |
| 140 | unsigned long flags; |
| 141 | |
| 142 | /* Turn off IRQs locally to minimize time that SPI is disabled. */ |
| 143 | local_irq_save(flags); |
| 144 | |
| 145 | /* Turn off SPI unit prior changing mode */ |
| 146 | tmp = mpc8xxx_spi_read_reg(espi_mode); |
| 147 | mpc8xxx_spi_write_reg(espi_mode, tmp & ~SPMODE_ENABLE); |
| 148 | mpc8xxx_spi_write_reg(mode, cs->hw_mode); |
| 149 | mpc8xxx_spi_write_reg(espi_mode, tmp); |
| 150 | |
| 151 | local_irq_restore(flags); |
| 152 | } |
| 153 | |
| 154 | static u32 fsl_espi_tx_buf_lsb(struct mpc8xxx_spi *mpc8xxx_spi) |
| 155 | { |
| 156 | u32 data; |
| 157 | u16 data_h; |
| 158 | u16 data_l; |
| 159 | const u32 *tx = mpc8xxx_spi->tx; |
| 160 | |
| 161 | if (!tx) |
| 162 | return 0; |
| 163 | |
| 164 | data = *tx++ << mpc8xxx_spi->tx_shift; |
| 165 | data_l = data & 0xffff; |
| 166 | data_h = (data >> 16) & 0xffff; |
| 167 | swab16s(&data_l); |
| 168 | swab16s(&data_h); |
| 169 | data = data_h | data_l; |
| 170 | |
| 171 | mpc8xxx_spi->tx = tx; |
| 172 | return data; |
| 173 | } |
| 174 | |
Heiner Kallweit | ea616ee | 2016-08-25 06:44:42 +0200 | [diff] [blame] | 175 | static void fsl_espi_setup_transfer(struct spi_device *spi, |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 176 | struct spi_transfer *t) |
| 177 | { |
| 178 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); |
| 179 | int bits_per_word = 0; |
| 180 | u8 pm; |
| 181 | u32 hz = 0; |
| 182 | struct spi_mpc8xxx_cs *cs = spi->controller_state; |
| 183 | |
| 184 | if (t) { |
| 185 | bits_per_word = t->bits_per_word; |
| 186 | hz = t->speed_hz; |
| 187 | } |
| 188 | |
| 189 | /* spi_transfer level calls that work per-word */ |
| 190 | if (!bits_per_word) |
| 191 | bits_per_word = spi->bits_per_word; |
| 192 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 193 | if (!hz) |
| 194 | hz = spi->max_speed_hz; |
| 195 | |
| 196 | cs->rx_shift = 0; |
| 197 | cs->tx_shift = 0; |
| 198 | cs->get_rx = mpc8xxx_spi_rx_buf_u32; |
| 199 | cs->get_tx = mpc8xxx_spi_tx_buf_u32; |
| 200 | if (bits_per_word <= 8) { |
| 201 | cs->rx_shift = 8 - bits_per_word; |
Stephen Warren | 51faed6 | 2013-05-30 09:59:41 -0600 | [diff] [blame] | 202 | } else { |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 203 | cs->rx_shift = 16 - bits_per_word; |
| 204 | if (spi->mode & SPI_LSB_FIRST) |
| 205 | cs->get_tx = fsl_espi_tx_buf_lsb; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | mpc8xxx_spi->rx_shift = cs->rx_shift; |
| 209 | mpc8xxx_spi->tx_shift = cs->tx_shift; |
| 210 | mpc8xxx_spi->get_rx = cs->get_rx; |
| 211 | mpc8xxx_spi->get_tx = cs->get_tx; |
| 212 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 213 | /* mask out bits we are going to set */ |
| 214 | cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF)); |
| 215 | |
Heiner Kallweit | a755af5 | 2016-09-04 09:56:57 +0200 | [diff] [blame] | 216 | cs->hw_mode |= CSMODE_LEN(bits_per_word - 1); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 217 | |
| 218 | if ((mpc8xxx_spi->spibrg / hz) > 64) { |
| 219 | cs->hw_mode |= CSMODE_DIV16; |
Sebastian Andrzej Siewior | 35faa55 | 2012-03-15 18:42:31 +0100 | [diff] [blame] | 220 | pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 221 | |
Sebastian Andrzej Siewior | 87bf5ab | 2012-03-15 18:42:32 +0100 | [diff] [blame] | 222 | WARN_ONCE(pm > 33, "%s: Requested speed is too low: %d Hz. " |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 223 | "Will use %d Hz instead.\n", dev_name(&spi->dev), |
Sebastian Andrzej Siewior | 87bf5ab | 2012-03-15 18:42:32 +0100 | [diff] [blame] | 224 | hz, mpc8xxx_spi->spibrg / (4 * 16 * (32 + 1))); |
| 225 | if (pm > 33) |
| 226 | pm = 33; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 227 | } else { |
Sebastian Andrzej Siewior | 35faa55 | 2012-03-15 18:42:31 +0100 | [diff] [blame] | 228 | pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 229 | } |
| 230 | if (pm) |
| 231 | pm--; |
Sebastian Andrzej Siewior | 87bf5ab | 2012-03-15 18:42:32 +0100 | [diff] [blame] | 232 | if (pm < 2) |
| 233 | pm = 2; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 234 | |
| 235 | cs->hw_mode |= CSMODE_PM(pm); |
| 236 | |
| 237 | fsl_espi_change_mode(spi); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 238 | } |
| 239 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 240 | static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t) |
| 241 | { |
| 242 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); |
| 243 | struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base; |
Heiner Kallweit | 5bcc6a2 | 2016-09-07 22:53:01 +0200 | [diff] [blame] | 244 | u32 word; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 245 | int ret; |
| 246 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 247 | mpc8xxx_spi->len = t->len; |
Heiner Kallweit | 5bcc6a2 | 2016-09-07 22:53:01 +0200 | [diff] [blame] | 248 | mpc8xxx_spi->count = roundup(t->len, 4) / 4; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 249 | |
| 250 | mpc8xxx_spi->tx = t->tx_buf; |
| 251 | mpc8xxx_spi->rx = t->rx_buf; |
| 252 | |
Wolfram Sang | 16735d0 | 2013-11-14 14:32:02 -0800 | [diff] [blame] | 253 | reinit_completion(&mpc8xxx_spi->done); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 254 | |
| 255 | /* Set SPCOM[CS] and SPCOM[TRANLEN] field */ |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 256 | mpc8xxx_spi_write_reg(®_base->command, |
| 257 | (SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1))); |
| 258 | |
Heiner Kallweit | 5bcc6a2 | 2016-09-07 22:53:01 +0200 | [diff] [blame] | 259 | /* enable rx ints */ |
| 260 | mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE); |
| 261 | |
| 262 | /* transmit word */ |
| 263 | word = mpc8xxx_spi->get_tx(mpc8xxx_spi); |
| 264 | mpc8xxx_spi_write_reg(®_base->transmit, word); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 265 | |
Nobuteru Hayashi | aa70e56 | 2016-03-18 11:35:21 +0000 | [diff] [blame] | 266 | /* Won't hang up forever, SPI bus sometimes got lost interrupts... */ |
| 267 | ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ); |
| 268 | if (ret == 0) |
| 269 | dev_err(mpc8xxx_spi->dev, |
| 270 | "Transaction hanging up (left %d bytes)\n", |
| 271 | mpc8xxx_spi->count); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 272 | |
| 273 | /* disable rx ints */ |
| 274 | mpc8xxx_spi_write_reg(®_base->mask, 0); |
| 275 | |
Heiner Kallweit | 84ccfc3 | 2016-09-07 22:52:43 +0200 | [diff] [blame] | 276 | return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 277 | } |
| 278 | |
Heiner Kallweit | 38d003f | 2016-09-07 22:54:51 +0200 | [diff] [blame^] | 279 | static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans) |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 280 | { |
Heiner Kallweit | 38d003f | 2016-09-07 22:54:51 +0200 | [diff] [blame^] | 281 | struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 282 | struct spi_device *spi = m->spi; |
Heiner Kallweit | 38d003f | 2016-09-07 22:54:51 +0200 | [diff] [blame^] | 283 | int ret; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 284 | |
Heiner Kallweit | 38d003f | 2016-09-07 22:54:51 +0200 | [diff] [blame^] | 285 | fsl_espi_copy_to_buf(m, mspi); |
Heiner Kallweit | faceef3 | 2016-09-07 22:52:06 +0200 | [diff] [blame] | 286 | fsl_espi_setup_transfer(spi, trans); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 287 | |
Heiner Kallweit | 06af115 | 2016-09-07 22:54:35 +0200 | [diff] [blame] | 288 | ret = fsl_espi_bufs(spi, trans); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 289 | |
Heiner Kallweit | faceef3 | 2016-09-07 22:52:06 +0200 | [diff] [blame] | 290 | if (trans->delay_usecs) |
| 291 | udelay(trans->delay_usecs); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 292 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 293 | fsl_espi_setup_transfer(spi, NULL); |
Heiner Kallweit | e33a3ad | 2016-09-07 22:51:10 +0200 | [diff] [blame] | 294 | |
Heiner Kallweit | cce7e3a | 2016-09-07 22:54:18 +0200 | [diff] [blame] | 295 | if (!ret) |
| 296 | fsl_espi_copy_from_buf(m, mspi); |
Heiner Kallweit | e33a3ad | 2016-09-07 22:51:10 +0200 | [diff] [blame] | 297 | |
| 298 | return ret; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 299 | } |
| 300 | |
Heiner Kallweit | c592bec | 2014-12-03 07:56:17 +0100 | [diff] [blame] | 301 | static int fsl_espi_do_one_msg(struct spi_master *master, |
| 302 | struct spi_message *m) |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 303 | { |
Heiner Kallweit | 96361faf | 2016-09-07 22:54:00 +0200 | [diff] [blame] | 304 | struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master); |
Heiner Kallweit | 06af115 | 2016-09-07 22:54:35 +0200 | [diff] [blame] | 305 | unsigned int delay_usecs = 0; |
Heiner Kallweit | faceef3 | 2016-09-07 22:52:06 +0200 | [diff] [blame] | 306 | struct spi_transfer *t, trans = {}; |
Heiner Kallweit | e33a3ad | 2016-09-07 22:51:10 +0200 | [diff] [blame] | 307 | int ret; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 308 | |
Heiner Kallweit | d3152cf1 | 2016-09-07 22:53:38 +0200 | [diff] [blame] | 309 | ret = fsl_espi_check_message(m); |
| 310 | if (ret) |
| 311 | goto out; |
| 312 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 313 | list_for_each_entry(t, &m->transfers, transfer_list) { |
Heiner Kallweit | 96361faf | 2016-09-07 22:54:00 +0200 | [diff] [blame] | 314 | if (t->delay_usecs > delay_usecs) |
| 315 | delay_usecs = t->delay_usecs; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 316 | } |
| 317 | |
Heiner Kallweit | 96361faf | 2016-09-07 22:54:00 +0200 | [diff] [blame] | 318 | t = list_first_entry(&m->transfers, struct spi_transfer, |
| 319 | transfer_list); |
| 320 | |
Heiner Kallweit | 06af115 | 2016-09-07 22:54:35 +0200 | [diff] [blame] | 321 | trans.len = m->frame_length; |
Heiner Kallweit | 96361faf | 2016-09-07 22:54:00 +0200 | [diff] [blame] | 322 | trans.speed_hz = t->speed_hz; |
| 323 | trans.bits_per_word = t->bits_per_word; |
| 324 | trans.delay_usecs = delay_usecs; |
| 325 | trans.tx_buf = mspi->local_buf; |
| 326 | trans.rx_buf = mspi->local_buf; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 327 | |
Heiner Kallweit | 06af115 | 2016-09-07 22:54:35 +0200 | [diff] [blame] | 328 | if (trans.len) |
| 329 | ret = fsl_espi_trans(m, &trans); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 330 | |
Heiner Kallweit | faceef3 | 2016-09-07 22:52:06 +0200 | [diff] [blame] | 331 | m->actual_length = ret ? 0 : trans.len; |
Heiner Kallweit | d3152cf1 | 2016-09-07 22:53:38 +0200 | [diff] [blame] | 332 | out: |
Heiner Kallweit | 0319d49 | 2016-09-07 22:51:29 +0200 | [diff] [blame] | 333 | if (m->status == -EINPROGRESS) |
| 334 | m->status = ret; |
| 335 | |
Heiner Kallweit | c592bec | 2014-12-03 07:56:17 +0100 | [diff] [blame] | 336 | spi_finalize_current_message(master); |
Heiner Kallweit | 0319d49 | 2016-09-07 22:51:29 +0200 | [diff] [blame] | 337 | |
| 338 | return ret; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 339 | } |
| 340 | |
| 341 | static int fsl_espi_setup(struct spi_device *spi) |
| 342 | { |
| 343 | struct mpc8xxx_spi *mpc8xxx_spi; |
| 344 | struct fsl_espi_reg *reg_base; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 345 | u32 hw_mode; |
| 346 | u32 loop_mode; |
Axel Lin | d9f2674 | 2014-08-31 12:44:09 +0800 | [diff] [blame] | 347 | struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 348 | |
| 349 | if (!spi->max_speed_hz) |
| 350 | return -EINVAL; |
| 351 | |
| 352 | if (!cs) { |
Axel Lin | d9f2674 | 2014-08-31 12:44:09 +0800 | [diff] [blame] | 353 | cs = kzalloc(sizeof(*cs), GFP_KERNEL); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 354 | if (!cs) |
| 355 | return -ENOMEM; |
Axel Lin | d9f2674 | 2014-08-31 12:44:09 +0800 | [diff] [blame] | 356 | spi_set_ctldata(spi, cs); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | mpc8xxx_spi = spi_master_get_devdata(spi->master); |
| 360 | reg_base = mpc8xxx_spi->reg_base; |
| 361 | |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 362 | pm_runtime_get_sync(mpc8xxx_spi->dev); |
| 363 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 364 | hw_mode = cs->hw_mode; /* Save original settings */ |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 365 | cs->hw_mode = mpc8xxx_spi_read_reg( |
| 366 | ®_base->csmode[spi->chip_select]); |
| 367 | /* mask out bits we are going to set */ |
| 368 | cs->hw_mode &= ~(CSMODE_CP_BEGIN_EDGECLK | CSMODE_CI_INACTIVEHIGH |
| 369 | | CSMODE_REV); |
| 370 | |
| 371 | if (spi->mode & SPI_CPHA) |
| 372 | cs->hw_mode |= CSMODE_CP_BEGIN_EDGECLK; |
| 373 | if (spi->mode & SPI_CPOL) |
| 374 | cs->hw_mode |= CSMODE_CI_INACTIVEHIGH; |
| 375 | if (!(spi->mode & SPI_LSB_FIRST)) |
| 376 | cs->hw_mode |= CSMODE_REV; |
| 377 | |
| 378 | /* Handle the loop mode */ |
| 379 | loop_mode = mpc8xxx_spi_read_reg(®_base->mode); |
| 380 | loop_mode &= ~SPMODE_LOOP; |
| 381 | if (spi->mode & SPI_LOOP) |
| 382 | loop_mode |= SPMODE_LOOP; |
| 383 | mpc8xxx_spi_write_reg(®_base->mode, loop_mode); |
| 384 | |
Heiner Kallweit | ea616ee | 2016-08-25 06:44:42 +0200 | [diff] [blame] | 385 | fsl_espi_setup_transfer(spi, NULL); |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 386 | |
| 387 | pm_runtime_mark_last_busy(mpc8xxx_spi->dev); |
| 388 | pm_runtime_put_autosuspend(mpc8xxx_spi->dev); |
| 389 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 390 | return 0; |
| 391 | } |
| 392 | |
Axel Lin | d9f2674 | 2014-08-31 12:44:09 +0800 | [diff] [blame] | 393 | static void fsl_espi_cleanup(struct spi_device *spi) |
| 394 | { |
| 395 | struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); |
| 396 | |
| 397 | kfree(cs); |
| 398 | spi_set_ctldata(spi, NULL); |
| 399 | } |
| 400 | |
Heiner Kallweit | 10ed1e6 | 2016-08-25 06:45:16 +0200 | [diff] [blame] | 401 | static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 402 | { |
| 403 | struct fsl_espi_reg *reg_base = mspi->reg_base; |
| 404 | |
| 405 | /* We need handle RX first */ |
| 406 | if (events & SPIE_NE) { |
Mingkai Hu | e6289d6 | 2010-12-21 09:26:07 +0800 | [diff] [blame] | 407 | u32 rx_data, tmp; |
| 408 | u8 rx_data_8; |
Nobuteru Hayashi | 6319a68 | 2016-03-18 11:35:21 +0000 | [diff] [blame] | 409 | int rx_nr_bytes = 4; |
Nobuteru Hayashi | a12ddd6 | 2016-03-18 11:35:21 +0000 | [diff] [blame] | 410 | int ret; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 411 | |
| 412 | /* Spin until RX is done */ |
Nobuteru Hayashi | a12ddd6 | 2016-03-18 11:35:21 +0000 | [diff] [blame] | 413 | if (SPIE_RXCNT(events) < min(4, mspi->len)) { |
| 414 | ret = spin_event_timeout( |
| 415 | !(SPIE_RXCNT(events = |
| 416 | mpc8xxx_spi_read_reg(®_base->event)) < |
| 417 | min(4, mspi->len)), |
| 418 | 10000, 0); /* 10 msec */ |
| 419 | if (!ret) |
| 420 | dev_err(mspi->dev, |
| 421 | "tired waiting for SPIE_RXCNT\n"); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 422 | } |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 423 | |
Mingkai Hu | e6289d6 | 2010-12-21 09:26:07 +0800 | [diff] [blame] | 424 | if (mspi->len >= 4) { |
| 425 | rx_data = mpc8xxx_spi_read_reg(®_base->receive); |
Nobuteru Hayashi | 6319a68 | 2016-03-18 11:35:21 +0000 | [diff] [blame] | 426 | } else if (mspi->len <= 0) { |
| 427 | dev_err(mspi->dev, |
| 428 | "unexpected RX(SPIE_NE) interrupt occurred,\n" |
| 429 | "(local rxlen %d bytes, reg rxlen %d bytes)\n", |
| 430 | min(4, mspi->len), SPIE_RXCNT(events)); |
| 431 | rx_nr_bytes = 0; |
Mingkai Hu | e6289d6 | 2010-12-21 09:26:07 +0800 | [diff] [blame] | 432 | } else { |
Nobuteru Hayashi | 6319a68 | 2016-03-18 11:35:21 +0000 | [diff] [blame] | 433 | rx_nr_bytes = mspi->len; |
Mingkai Hu | e6289d6 | 2010-12-21 09:26:07 +0800 | [diff] [blame] | 434 | tmp = mspi->len; |
| 435 | rx_data = 0; |
| 436 | while (tmp--) { |
| 437 | rx_data_8 = in_8((u8 *)®_base->receive); |
| 438 | rx_data |= (rx_data_8 << (tmp * 8)); |
| 439 | } |
| 440 | |
| 441 | rx_data <<= (4 - mspi->len) * 8; |
| 442 | } |
| 443 | |
Nobuteru Hayashi | 6319a68 | 2016-03-18 11:35:21 +0000 | [diff] [blame] | 444 | mspi->len -= rx_nr_bytes; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 445 | |
| 446 | if (mspi->rx) |
| 447 | mspi->get_rx(rx_data, mspi); |
| 448 | } |
| 449 | |
| 450 | if (!(events & SPIE_NF)) { |
| 451 | int ret; |
| 452 | |
| 453 | /* spin until TX is done */ |
| 454 | ret = spin_event_timeout(((events = mpc8xxx_spi_read_reg( |
Jane Wan | 7a0a175 | 2015-05-01 16:37:42 -0700 | [diff] [blame] | 455 | ®_base->event)) & SPIE_NF), 1000, 0); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 456 | if (!ret) { |
| 457 | dev_err(mspi->dev, "tired waiting for SPIE_NF\n"); |
Jane Wan | 7a0a175 | 2015-05-01 16:37:42 -0700 | [diff] [blame] | 458 | |
| 459 | /* Clear the SPIE bits */ |
| 460 | mpc8xxx_spi_write_reg(®_base->event, events); |
| 461 | complete(&mspi->done); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 462 | return; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | /* Clear the events */ |
| 467 | mpc8xxx_spi_write_reg(®_base->event, events); |
| 468 | |
| 469 | mspi->count -= 1; |
| 470 | if (mspi->count) { |
| 471 | u32 word = mspi->get_tx(mspi); |
| 472 | |
| 473 | mpc8xxx_spi_write_reg(®_base->transmit, word); |
| 474 | } else { |
| 475 | complete(&mspi->done); |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | static irqreturn_t fsl_espi_irq(s32 irq, void *context_data) |
| 480 | { |
| 481 | struct mpc8xxx_spi *mspi = context_data; |
| 482 | struct fsl_espi_reg *reg_base = mspi->reg_base; |
| 483 | irqreturn_t ret = IRQ_NONE; |
| 484 | u32 events; |
| 485 | |
| 486 | /* Get interrupt events(tx/rx) */ |
| 487 | events = mpc8xxx_spi_read_reg(®_base->event); |
| 488 | if (events) |
| 489 | ret = IRQ_HANDLED; |
| 490 | |
| 491 | dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events); |
| 492 | |
| 493 | fsl_espi_cpu_irq(mspi, events); |
| 494 | |
| 495 | return ret; |
| 496 | } |
| 497 | |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 498 | #ifdef CONFIG_PM |
| 499 | static int fsl_espi_runtime_suspend(struct device *dev) |
Heiner Kallweit | 75506d0 | 2014-12-03 07:56:19 +0100 | [diff] [blame] | 500 | { |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 501 | struct spi_master *master = dev_get_drvdata(dev); |
| 502 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); |
| 503 | struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base; |
Heiner Kallweit | 75506d0 | 2014-12-03 07:56:19 +0100 | [diff] [blame] | 504 | u32 regval; |
| 505 | |
Heiner Kallweit | 75506d0 | 2014-12-03 07:56:19 +0100 | [diff] [blame] | 506 | regval = mpc8xxx_spi_read_reg(®_base->mode); |
| 507 | regval &= ~SPMODE_ENABLE; |
| 508 | mpc8xxx_spi_write_reg(®_base->mode, regval); |
| 509 | |
| 510 | return 0; |
| 511 | } |
| 512 | |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 513 | static int fsl_espi_runtime_resume(struct device *dev) |
Heiner Kallweit | 75506d0 | 2014-12-03 07:56:19 +0100 | [diff] [blame] | 514 | { |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 515 | struct spi_master *master = dev_get_drvdata(dev); |
| 516 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); |
| 517 | struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base; |
Heiner Kallweit | 75506d0 | 2014-12-03 07:56:19 +0100 | [diff] [blame] | 518 | u32 regval; |
| 519 | |
Heiner Kallweit | 75506d0 | 2014-12-03 07:56:19 +0100 | [diff] [blame] | 520 | regval = mpc8xxx_spi_read_reg(®_base->mode); |
| 521 | regval |= SPMODE_ENABLE; |
| 522 | mpc8xxx_spi_write_reg(®_base->mode, regval); |
| 523 | |
| 524 | return 0; |
| 525 | } |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 526 | #endif |
Heiner Kallweit | 75506d0 | 2014-12-03 07:56:19 +0100 | [diff] [blame] | 527 | |
Heiner Kallweit | 02a595d | 2016-08-17 21:11:01 +0200 | [diff] [blame] | 528 | static size_t fsl_espi_max_message_size(struct spi_device *spi) |
Michal Suchanek | b541eef | 2015-12-02 10:38:21 +0000 | [diff] [blame] | 529 | { |
| 530 | return SPCOM_TRANLEN_MAX; |
| 531 | } |
| 532 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 533 | static struct spi_master * fsl_espi_probe(struct device *dev, |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 534 | struct resource *mem, unsigned int irq) |
| 535 | { |
Jingoo Han | 8074cf0 | 2013-07-30 16:58:59 +0900 | [diff] [blame] | 536 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 537 | struct spi_master *master; |
| 538 | struct mpc8xxx_spi *mpc8xxx_spi; |
| 539 | struct fsl_espi_reg *reg_base; |
Jane Wan | d0fb47a5 | 2014-04-16 13:09:39 -0700 | [diff] [blame] | 540 | struct device_node *nc; |
| 541 | const __be32 *prop; |
| 542 | u32 regval, csmode; |
| 543 | int i, len, ret = 0; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 544 | |
| 545 | master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); |
| 546 | if (!master) { |
| 547 | ret = -ENOMEM; |
| 548 | goto err; |
| 549 | } |
| 550 | |
| 551 | dev_set_drvdata(dev, master); |
| 552 | |
Heiner Kallweit | c592bec | 2014-12-03 07:56:17 +0100 | [diff] [blame] | 553 | mpc8xxx_spi_probe(dev, mem, irq); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 554 | |
Stephen Warren | 24778be | 2013-05-21 20:36:35 -0600 | [diff] [blame] | 555 | master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 556 | master->setup = fsl_espi_setup; |
Axel Lin | d9f2674 | 2014-08-31 12:44:09 +0800 | [diff] [blame] | 557 | master->cleanup = fsl_espi_cleanup; |
Heiner Kallweit | c592bec | 2014-12-03 07:56:17 +0100 | [diff] [blame] | 558 | master->transfer_one_message = fsl_espi_do_one_msg; |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 559 | master->auto_runtime_pm = true; |
Heiner Kallweit | 02a595d | 2016-08-17 21:11:01 +0200 | [diff] [blame] | 560 | master->max_message_size = fsl_espi_max_message_size; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 561 | |
| 562 | mpc8xxx_spi = spi_master_get_devdata(master); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 563 | |
Heiner Kallweit | 1423877 | 2016-09-07 22:50:22 +0200 | [diff] [blame] | 564 | mpc8xxx_spi->local_buf = |
| 565 | devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL); |
| 566 | if (!mpc8xxx_spi->local_buf) { |
| 567 | ret = -ENOMEM; |
| 568 | goto err_probe; |
| 569 | } |
| 570 | |
Heiner Kallweit | 4178b6b | 2015-08-26 21:21:50 +0200 | [diff] [blame] | 571 | mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem); |
Axel Lin | 37c5db7 | 2015-08-30 18:35:51 +0800 | [diff] [blame] | 572 | if (IS_ERR(mpc8xxx_spi->reg_base)) { |
| 573 | ret = PTR_ERR(mpc8xxx_spi->reg_base); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 574 | goto err_probe; |
| 575 | } |
| 576 | |
| 577 | reg_base = mpc8xxx_spi->reg_base; |
| 578 | |
| 579 | /* Register for SPI Interrupt */ |
Heiner Kallweit | 4178b6b | 2015-08-26 21:21:50 +0200 | [diff] [blame] | 580 | ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_espi_irq, |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 581 | 0, "fsl_espi", mpc8xxx_spi); |
| 582 | if (ret) |
Heiner Kallweit | 4178b6b | 2015-08-26 21:21:50 +0200 | [diff] [blame] | 583 | goto err_probe; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 584 | |
| 585 | if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { |
| 586 | mpc8xxx_spi->rx_shift = 16; |
| 587 | mpc8xxx_spi->tx_shift = 24; |
| 588 | } |
| 589 | |
| 590 | /* SPI controller initializations */ |
| 591 | mpc8xxx_spi_write_reg(®_base->mode, 0); |
| 592 | mpc8xxx_spi_write_reg(®_base->mask, 0); |
| 593 | mpc8xxx_spi_write_reg(®_base->command, 0); |
| 594 | mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); |
| 595 | |
| 596 | /* Init eSPI CS mode register */ |
Jane Wan | d0fb47a5 | 2014-04-16 13:09:39 -0700 | [diff] [blame] | 597 | for_each_available_child_of_node(master->dev.of_node, nc) { |
| 598 | /* get chip select */ |
| 599 | prop = of_get_property(nc, "reg", &len); |
| 600 | if (!prop || len < sizeof(*prop)) |
| 601 | continue; |
| 602 | i = be32_to_cpup(prop); |
| 603 | if (i < 0 || i >= pdata->max_chipselect) |
| 604 | continue; |
| 605 | |
| 606 | csmode = CSMODE_INIT_VAL; |
| 607 | /* check if CSBEF is set in device tree */ |
| 608 | prop = of_get_property(nc, "fsl,csbef", &len); |
| 609 | if (prop && len >= sizeof(*prop)) { |
| 610 | csmode &= ~(CSMODE_BEF(0xf)); |
| 611 | csmode |= CSMODE_BEF(be32_to_cpup(prop)); |
| 612 | } |
| 613 | /* check if CSAFT is set in device tree */ |
| 614 | prop = of_get_property(nc, "fsl,csaft", &len); |
| 615 | if (prop && len >= sizeof(*prop)) { |
| 616 | csmode &= ~(CSMODE_AFT(0xf)); |
| 617 | csmode |= CSMODE_AFT(be32_to_cpup(prop)); |
| 618 | } |
| 619 | mpc8xxx_spi_write_reg(®_base->csmode[i], csmode); |
| 620 | |
| 621 | dev_info(dev, "cs=%d, init_csmode=0x%x\n", i, csmode); |
| 622 | } |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 623 | |
| 624 | /* Enable SPI interface */ |
| 625 | regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; |
| 626 | |
| 627 | mpc8xxx_spi_write_reg(®_base->mode, regval); |
| 628 | |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 629 | pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_TIMEOUT); |
| 630 | pm_runtime_use_autosuspend(dev); |
| 631 | pm_runtime_set_active(dev); |
| 632 | pm_runtime_enable(dev); |
| 633 | pm_runtime_get_sync(dev); |
| 634 | |
Heiner Kallweit | 4178b6b | 2015-08-26 21:21:50 +0200 | [diff] [blame] | 635 | ret = devm_spi_register_master(dev, master); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 636 | if (ret < 0) |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 637 | goto err_pm; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 638 | |
| 639 | dev_info(dev, "at 0x%p (irq = %d)\n", reg_base, mpc8xxx_spi->irq); |
| 640 | |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 641 | pm_runtime_mark_last_busy(dev); |
| 642 | pm_runtime_put_autosuspend(dev); |
| 643 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 644 | return master; |
| 645 | |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 646 | err_pm: |
| 647 | pm_runtime_put_noidle(dev); |
| 648 | pm_runtime_disable(dev); |
| 649 | pm_runtime_set_suspended(dev); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 650 | err_probe: |
| 651 | spi_master_put(master); |
| 652 | err: |
| 653 | return ERR_PTR(ret); |
| 654 | } |
| 655 | |
| 656 | static int of_fsl_espi_get_chipselects(struct device *dev) |
| 657 | { |
| 658 | struct device_node *np = dev->of_node; |
Jingoo Han | 8074cf0 | 2013-07-30 16:58:59 +0900 | [diff] [blame] | 659 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 660 | const u32 *prop; |
| 661 | int len; |
| 662 | |
| 663 | prop = of_get_property(np, "fsl,espi-num-chipselects", &len); |
| 664 | if (!prop || len < sizeof(*prop)) { |
| 665 | dev_err(dev, "No 'fsl,espi-num-chipselects' property\n"); |
| 666 | return -EINVAL; |
| 667 | } |
| 668 | |
| 669 | pdata->max_chipselect = *prop; |
| 670 | pdata->cs_control = NULL; |
| 671 | |
| 672 | return 0; |
| 673 | } |
| 674 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 675 | static int of_fsl_espi_probe(struct platform_device *ofdev) |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 676 | { |
| 677 | struct device *dev = &ofdev->dev; |
| 678 | struct device_node *np = ofdev->dev.of_node; |
| 679 | struct spi_master *master; |
| 680 | struct resource mem; |
Thierry Reding | f757849 | 2013-09-18 15:24:44 +0200 | [diff] [blame] | 681 | unsigned int irq; |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 682 | int ret = -ENOMEM; |
| 683 | |
Grant Likely | 18d306d | 2011-02-22 21:02:43 -0700 | [diff] [blame] | 684 | ret = of_mpc8xxx_spi_probe(ofdev); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 685 | if (ret) |
| 686 | return ret; |
| 687 | |
| 688 | ret = of_fsl_espi_get_chipselects(dev); |
| 689 | if (ret) |
| 690 | goto err; |
| 691 | |
| 692 | ret = of_address_to_resource(np, 0, &mem); |
| 693 | if (ret) |
| 694 | goto err; |
| 695 | |
Thierry Reding | f757849 | 2013-09-18 15:24:44 +0200 | [diff] [blame] | 696 | irq = irq_of_parse_and_map(np, 0); |
Hou Zhiqiang | 7227cd1 | 2013-12-11 13:09:40 +0800 | [diff] [blame] | 697 | if (!irq) { |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 698 | ret = -EINVAL; |
| 699 | goto err; |
| 700 | } |
| 701 | |
Thierry Reding | f757849 | 2013-09-18 15:24:44 +0200 | [diff] [blame] | 702 | master = fsl_espi_probe(dev, &mem, irq); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 703 | if (IS_ERR(master)) { |
| 704 | ret = PTR_ERR(master); |
| 705 | goto err; |
| 706 | } |
| 707 | |
| 708 | return 0; |
| 709 | |
| 710 | err: |
| 711 | return ret; |
| 712 | } |
| 713 | |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 714 | static int of_fsl_espi_remove(struct platform_device *dev) |
| 715 | { |
| 716 | pm_runtime_disable(&dev->dev); |
| 717 | |
| 718 | return 0; |
| 719 | } |
| 720 | |
Hou Zhiqiang | 714bb65 | 2013-12-12 12:53:52 +0800 | [diff] [blame] | 721 | #ifdef CONFIG_PM_SLEEP |
| 722 | static int of_fsl_espi_suspend(struct device *dev) |
| 723 | { |
| 724 | struct spi_master *master = dev_get_drvdata(dev); |
Hou Zhiqiang | 714bb65 | 2013-12-12 12:53:52 +0800 | [diff] [blame] | 725 | int ret; |
| 726 | |
Hou Zhiqiang | 714bb65 | 2013-12-12 12:53:52 +0800 | [diff] [blame] | 727 | ret = spi_master_suspend(master); |
| 728 | if (ret) { |
| 729 | dev_warn(dev, "cannot suspend master\n"); |
| 730 | return ret; |
| 731 | } |
| 732 | |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 733 | ret = pm_runtime_force_suspend(dev); |
| 734 | if (ret < 0) |
| 735 | return ret; |
| 736 | |
| 737 | return 0; |
Hou Zhiqiang | 714bb65 | 2013-12-12 12:53:52 +0800 | [diff] [blame] | 738 | } |
| 739 | |
| 740 | static int of_fsl_espi_resume(struct device *dev) |
| 741 | { |
| 742 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); |
| 743 | struct spi_master *master = dev_get_drvdata(dev); |
| 744 | struct mpc8xxx_spi *mpc8xxx_spi; |
| 745 | struct fsl_espi_reg *reg_base; |
| 746 | u32 regval; |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 747 | int i, ret; |
Hou Zhiqiang | 714bb65 | 2013-12-12 12:53:52 +0800 | [diff] [blame] | 748 | |
| 749 | mpc8xxx_spi = spi_master_get_devdata(master); |
| 750 | reg_base = mpc8xxx_spi->reg_base; |
| 751 | |
| 752 | /* SPI controller initializations */ |
| 753 | mpc8xxx_spi_write_reg(®_base->mode, 0); |
| 754 | mpc8xxx_spi_write_reg(®_base->mask, 0); |
| 755 | mpc8xxx_spi_write_reg(®_base->command, 0); |
| 756 | mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); |
| 757 | |
| 758 | /* Init eSPI CS mode register */ |
| 759 | for (i = 0; i < pdata->max_chipselect; i++) |
| 760 | mpc8xxx_spi_write_reg(®_base->csmode[i], CSMODE_INIT_VAL); |
| 761 | |
| 762 | /* Enable SPI interface */ |
| 763 | regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; |
| 764 | |
| 765 | mpc8xxx_spi_write_reg(®_base->mode, regval); |
| 766 | |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 767 | ret = pm_runtime_force_resume(dev); |
| 768 | if (ret < 0) |
| 769 | return ret; |
| 770 | |
Hou Zhiqiang | 714bb65 | 2013-12-12 12:53:52 +0800 | [diff] [blame] | 771 | return spi_master_resume(master); |
| 772 | } |
| 773 | #endif /* CONFIG_PM_SLEEP */ |
| 774 | |
| 775 | static const struct dev_pm_ops espi_pm = { |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 776 | SET_RUNTIME_PM_OPS(fsl_espi_runtime_suspend, |
| 777 | fsl_espi_runtime_resume, NULL) |
Hou Zhiqiang | 714bb65 | 2013-12-12 12:53:52 +0800 | [diff] [blame] | 778 | SET_SYSTEM_SLEEP_PM_OPS(of_fsl_espi_suspend, of_fsl_espi_resume) |
| 779 | }; |
| 780 | |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 781 | static const struct of_device_id of_fsl_espi_match[] = { |
| 782 | { .compatible = "fsl,mpc8536-espi" }, |
| 783 | {} |
| 784 | }; |
| 785 | MODULE_DEVICE_TABLE(of, of_fsl_espi_match); |
| 786 | |
Grant Likely | 18d306d | 2011-02-22 21:02:43 -0700 | [diff] [blame] | 787 | static struct platform_driver fsl_espi_driver = { |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 788 | .driver = { |
| 789 | .name = "fsl_espi", |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 790 | .of_match_table = of_fsl_espi_match, |
Hou Zhiqiang | 714bb65 | 2013-12-12 12:53:52 +0800 | [diff] [blame] | 791 | .pm = &espi_pm, |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 792 | }, |
| 793 | .probe = of_fsl_espi_probe, |
Heiner Kallweit | e9abb4d | 2015-08-26 21:21:55 +0200 | [diff] [blame] | 794 | .remove = of_fsl_espi_remove, |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 795 | }; |
Grant Likely | 940ab88 | 2011-10-05 11:29:49 -0600 | [diff] [blame] | 796 | module_platform_driver(fsl_espi_driver); |
Mingkai Hu | 8b60d6c | 2010-10-12 18:18:32 +0800 | [diff] [blame] | 797 | |
| 798 | MODULE_AUTHOR("Mingkai Hu"); |
| 799 | MODULE_DESCRIPTION("Enhanced Freescale SPI Driver"); |
| 800 | MODULE_LICENSE("GPL"); |