1d96be879SSascha Hauer /* 2d96be879SSascha Hauer * linux/drivers/mmc/host/mxcmmc.c - Freescale i.MX MMCI driver 3d96be879SSascha Hauer * 4d96be879SSascha Hauer * This is a driver for the SDHC controller found in Freescale MX2/MX3 5d96be879SSascha Hauer * SoCs. It is basically the same hardware as found on MX1 (imxmmc.c). 6d96be879SSascha Hauer * Unlike the hardware found on MX1, this hardware just works and does 73ad2f3fbSDaniel Mack * not need all the quirks found in imxmmc.c, hence the separate driver. 8d96be879SSascha Hauer * 9d96be879SSascha Hauer * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> 10d96be879SSascha Hauer * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com> 11d96be879SSascha Hauer * 12d96be879SSascha Hauer * derived from pxamci.c by Russell King 13d96be879SSascha Hauer * 14d96be879SSascha Hauer * This program is free software; you can redistribute it and/or modify 15d96be879SSascha Hauer * it under the terms of the GNU General Public License version 2 as 16d96be879SSascha Hauer * published by the Free Software Foundation. 17d96be879SSascha Hauer * 18d96be879SSascha Hauer */ 19d96be879SSascha Hauer 20d96be879SSascha Hauer #include <linux/module.h> 21d96be879SSascha Hauer #include <linux/init.h> 22d96be879SSascha Hauer #include <linux/ioport.h> 23d96be879SSascha Hauer #include <linux/platform_device.h> 24d96be879SSascha Hauer #include <linux/interrupt.h> 25d96be879SSascha Hauer #include <linux/irq.h> 26d96be879SSascha Hauer #include <linux/blkdev.h> 27d96be879SSascha Hauer #include <linux/dma-mapping.h> 28d96be879SSascha Hauer #include <linux/mmc/host.h> 29d96be879SSascha Hauer #include <linux/mmc/card.h> 30d96be879SSascha Hauer #include <linux/delay.h> 31d96be879SSascha Hauer #include <linux/clk.h> 32d96be879SSascha Hauer #include <linux/io.h> 33d96be879SSascha Hauer #include <linux/gpio.h> 3474b66954SAlberto Panizzo #include <linux/regulator/consumer.h> 35f53fbde4SSascha Hauer #include <linux/dmaengine.h> 36d96be879SSascha Hauer 37d96be879SSascha Hauer #include <asm/dma.h> 38d96be879SSascha Hauer #include <asm/irq.h> 39d96be879SSascha Hauer #include <asm/sizes.h> 40d96be879SSascha Hauer #include <mach/mmc.h> 41d96be879SSascha Hauer 42f53fbde4SSascha Hauer #include <mach/dma.h> 43edae8998SShawn Guo #include <mach/hardware.h> 44d96be879SSascha Hauer 459563b1dbSSascha Hauer #define DRIVER_NAME "mxc-mmc" 46d96be879SSascha Hauer 47d96be879SSascha Hauer #define MMC_REG_STR_STP_CLK 0x00 48d96be879SSascha Hauer #define MMC_REG_STATUS 0x04 49d96be879SSascha Hauer #define MMC_REG_CLK_RATE 0x08 50d96be879SSascha Hauer #define MMC_REG_CMD_DAT_CONT 0x0C 51d96be879SSascha Hauer #define MMC_REG_RES_TO 0x10 52d96be879SSascha Hauer #define MMC_REG_READ_TO 0x14 53d96be879SSascha Hauer #define MMC_REG_BLK_LEN 0x18 54d96be879SSascha Hauer #define MMC_REG_NOB 0x1C 55d96be879SSascha Hauer #define MMC_REG_REV_NO 0x20 56d96be879SSascha Hauer #define MMC_REG_INT_CNTR 0x24 57d96be879SSascha Hauer #define MMC_REG_CMD 0x28 58d96be879SSascha Hauer #define MMC_REG_ARG 0x2C 59d96be879SSascha Hauer #define MMC_REG_RES_FIFO 0x34 60d96be879SSascha Hauer #define MMC_REG_BUFFER_ACCESS 0x38 61d96be879SSascha Hauer 62d96be879SSascha Hauer #define STR_STP_CLK_RESET (1 << 3) 63d96be879SSascha Hauer #define STR_STP_CLK_START_CLK (1 << 1) 64d96be879SSascha Hauer #define STR_STP_CLK_STOP_CLK (1 << 0) 65d96be879SSascha Hauer 66d96be879SSascha Hauer #define STATUS_CARD_INSERTION (1 << 31) 67d96be879SSascha Hauer #define STATUS_CARD_REMOVAL (1 << 30) 68d96be879SSascha Hauer #define STATUS_YBUF_EMPTY (1 << 29) 69d96be879SSascha Hauer #define STATUS_XBUF_EMPTY (1 << 28) 70d96be879SSascha Hauer #define STATUS_YBUF_FULL (1 << 27) 71d96be879SSascha Hauer #define STATUS_XBUF_FULL (1 << 26) 72d96be879SSascha Hauer #define STATUS_BUF_UND_RUN (1 << 25) 73d96be879SSascha Hauer #define STATUS_BUF_OVFL (1 << 24) 74d96be879SSascha Hauer #define STATUS_SDIO_INT_ACTIVE (1 << 14) 75d96be879SSascha Hauer #define STATUS_END_CMD_RESP (1 << 13) 76d96be879SSascha Hauer #define STATUS_WRITE_OP_DONE (1 << 12) 77d96be879SSascha Hauer #define STATUS_DATA_TRANS_DONE (1 << 11) 78d96be879SSascha Hauer #define STATUS_READ_OP_DONE (1 << 11) 79d96be879SSascha Hauer #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10) 80d96be879SSascha Hauer #define STATUS_CARD_BUS_CLK_RUN (1 << 8) 81d96be879SSascha Hauer #define STATUS_BUF_READ_RDY (1 << 7) 82d96be879SSascha Hauer #define STATUS_BUF_WRITE_RDY (1 << 6) 83d96be879SSascha Hauer #define STATUS_RESP_CRC_ERR (1 << 5) 84d96be879SSascha Hauer #define STATUS_CRC_READ_ERR (1 << 3) 85d96be879SSascha Hauer #define STATUS_CRC_WRITE_ERR (1 << 2) 86d96be879SSascha Hauer #define STATUS_TIME_OUT_RESP (1 << 1) 87d96be879SSascha Hauer #define STATUS_TIME_OUT_READ (1 << 0) 88d96be879SSascha Hauer #define STATUS_ERR_MASK 0x2f 89d96be879SSascha Hauer 90d96be879SSascha Hauer #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12) 91d96be879SSascha Hauer #define CMD_DAT_CONT_STOP_READWAIT (1 << 11) 92d96be879SSascha Hauer #define CMD_DAT_CONT_START_READWAIT (1 << 10) 93d96be879SSascha Hauer #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8) 94d96be879SSascha Hauer #define CMD_DAT_CONT_INIT (1 << 7) 95d96be879SSascha Hauer #define CMD_DAT_CONT_WRITE (1 << 4) 96d96be879SSascha Hauer #define CMD_DAT_CONT_DATA_ENABLE (1 << 3) 97d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0) 98d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0) 99d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0) 100d96be879SSascha Hauer 101d96be879SSascha Hauer #define INT_SDIO_INT_WKP_EN (1 << 18) 102d96be879SSascha Hauer #define INT_CARD_INSERTION_WKP_EN (1 << 17) 103d96be879SSascha Hauer #define INT_CARD_REMOVAL_WKP_EN (1 << 16) 104d96be879SSascha Hauer #define INT_CARD_INSERTION_EN (1 << 15) 105d96be879SSascha Hauer #define INT_CARD_REMOVAL_EN (1 << 14) 106d96be879SSascha Hauer #define INT_SDIO_IRQ_EN (1 << 13) 107d96be879SSascha Hauer #define INT_DAT0_EN (1 << 12) 108d96be879SSascha Hauer #define INT_BUF_READ_EN (1 << 4) 109d96be879SSascha Hauer #define INT_BUF_WRITE_EN (1 << 3) 110d96be879SSascha Hauer #define INT_END_CMD_RES_EN (1 << 2) 111d96be879SSascha Hauer #define INT_WRITE_OP_DONE_EN (1 << 1) 112d96be879SSascha Hauer #define INT_READ_OP_EN (1 << 0) 113d96be879SSascha Hauer 114d96be879SSascha Hauer struct mxcmci_host { 115d96be879SSascha Hauer struct mmc_host *mmc; 116d96be879SSascha Hauer struct resource *res; 117d96be879SSascha Hauer void __iomem *base; 118d96be879SSascha Hauer int irq; 119d96be879SSascha Hauer int detect_irq; 120f53fbde4SSascha Hauer struct dma_chan *dma; 121f53fbde4SSascha Hauer struct dma_async_tx_descriptor *desc; 122d96be879SSascha Hauer int do_dma; 12316b3bf8cSEric Bénard int default_irq_mask; 124f441b993SDaniel Mack int use_sdio; 125d96be879SSascha Hauer unsigned int power_mode; 126d96be879SSascha Hauer struct imxmmc_platform_data *pdata; 127d96be879SSascha Hauer 128d96be879SSascha Hauer struct mmc_request *req; 129d96be879SSascha Hauer struct mmc_command *cmd; 130d96be879SSascha Hauer struct mmc_data *data; 131d96be879SSascha Hauer 132d96be879SSascha Hauer unsigned int datasize; 133d96be879SSascha Hauer unsigned int dma_dir; 134d96be879SSascha Hauer 135d96be879SSascha Hauer u16 rev_no; 136d96be879SSascha Hauer unsigned int cmdat; 137d96be879SSascha Hauer 138d96be879SSascha Hauer struct clk *clk; 139d96be879SSascha Hauer 140d96be879SSascha Hauer int clock; 141d96be879SSascha Hauer 142d96be879SSascha Hauer struct work_struct datawork; 143f441b993SDaniel Mack spinlock_t lock; 14474b66954SAlberto Panizzo 14574b66954SAlberto Panizzo struct regulator *vcc; 146f53fbde4SSascha Hauer 147f53fbde4SSascha Hauer int burstlen; 148f53fbde4SSascha Hauer int dmareq; 149f53fbde4SSascha Hauer struct dma_slave_config dma_slave_config; 150f53fbde4SSascha Hauer struct imx_dma_data dma_data; 151d96be879SSascha Hauer }; 152d96be879SSascha Hauer 15318489fa2SMartin Fuzzey static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios); 15418489fa2SMartin Fuzzey 15574b66954SAlberto Panizzo static inline void mxcmci_init_ocr(struct mxcmci_host *host) 15674b66954SAlberto Panizzo { 15774b66954SAlberto Panizzo host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc"); 15874b66954SAlberto Panizzo 15974b66954SAlberto Panizzo if (IS_ERR(host->vcc)) { 16074b66954SAlberto Panizzo host->vcc = NULL; 16174b66954SAlberto Panizzo } else { 16274b66954SAlberto Panizzo host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc); 16374b66954SAlberto Panizzo if (host->pdata && host->pdata->ocr_avail) 16474b66954SAlberto Panizzo dev_warn(mmc_dev(host->mmc), 16574b66954SAlberto Panizzo "pdata->ocr_avail will not be used\n"); 16674b66954SAlberto Panizzo } 167d078d242SAlberto Panizzo 16874b66954SAlberto Panizzo if (host->vcc == NULL) { 16974b66954SAlberto Panizzo /* fall-back to platform data */ 17074b66954SAlberto Panizzo if (host->pdata && host->pdata->ocr_avail) 17174b66954SAlberto Panizzo host->mmc->ocr_avail = host->pdata->ocr_avail; 17274b66954SAlberto Panizzo else 17374b66954SAlberto Panizzo host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 17474b66954SAlberto Panizzo } 17574b66954SAlberto Panizzo } 17674b66954SAlberto Panizzo 177d078d242SAlberto Panizzo static inline void mxcmci_set_power(struct mxcmci_host *host, 178d078d242SAlberto Panizzo unsigned char power_mode, 179d078d242SAlberto Panizzo unsigned int vdd) 18074b66954SAlberto Panizzo { 181d078d242SAlberto Panizzo if (host->vcc) { 182d078d242SAlberto Panizzo if (power_mode == MMC_POWER_UP) 183d078d242SAlberto Panizzo mmc_regulator_set_ocr(host->mmc, host->vcc, vdd); 184d078d242SAlberto Panizzo else if (power_mode == MMC_POWER_OFF) 185d078d242SAlberto Panizzo mmc_regulator_set_ocr(host->mmc, host->vcc, 0); 186d078d242SAlberto Panizzo } 187d078d242SAlberto Panizzo 18874b66954SAlberto Panizzo if (host->pdata && host->pdata->setpower) 18974b66954SAlberto Panizzo host->pdata->setpower(mmc_dev(host->mmc), vdd); 19074b66954SAlberto Panizzo } 19174b66954SAlberto Panizzo 192d96be879SSascha Hauer static inline int mxcmci_use_dma(struct mxcmci_host *host) 193d96be879SSascha Hauer { 194d96be879SSascha Hauer return host->do_dma; 195d96be879SSascha Hauer } 196d96be879SSascha Hauer 197d96be879SSascha Hauer static void mxcmci_softreset(struct mxcmci_host *host) 198d96be879SSascha Hauer { 199d96be879SSascha Hauer int i; 200d96be879SSascha Hauer 2014725f6f1SDaniel Mack dev_dbg(mmc_dev(host->mmc), "mxcmci_softreset\n"); 2024725f6f1SDaniel Mack 203d96be879SSascha Hauer /* reset sequence */ 204d96be879SSascha Hauer writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK); 205d96be879SSascha Hauer writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK, 206d96be879SSascha Hauer host->base + MMC_REG_STR_STP_CLK); 207d96be879SSascha Hauer 208d96be879SSascha Hauer for (i = 0; i < 8; i++) 209d96be879SSascha Hauer writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); 210d96be879SSascha Hauer 211d96be879SSascha Hauer writew(0xff, host->base + MMC_REG_RES_TO); 212d96be879SSascha Hauer } 213f53fbde4SSascha Hauer static int mxcmci_setup_dma(struct mmc_host *mmc); 214d96be879SSascha Hauer 215656217d2SMartin Fuzzey static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data) 216d96be879SSascha Hauer { 217d96be879SSascha Hauer unsigned int nob = data->blocks; 218d96be879SSascha Hauer unsigned int blksz = data->blksz; 219d96be879SSascha Hauer unsigned int datasize = nob * blksz; 220d96be879SSascha Hauer struct scatterlist *sg; 221f53fbde4SSascha Hauer int i, nents; 222f53fbde4SSascha Hauer 223d96be879SSascha Hauer if (data->flags & MMC_DATA_STREAM) 224d96be879SSascha Hauer nob = 0xffff; 225d96be879SSascha Hauer 226d96be879SSascha Hauer host->data = data; 227d96be879SSascha Hauer data->bytes_xfered = 0; 228d96be879SSascha Hauer 229d96be879SSascha Hauer writew(nob, host->base + MMC_REG_NOB); 230d96be879SSascha Hauer writew(blksz, host->base + MMC_REG_BLK_LEN); 231d96be879SSascha Hauer host->datasize = datasize; 232d96be879SSascha Hauer 233f53fbde4SSascha Hauer if (!mxcmci_use_dma(host)) 234f53fbde4SSascha Hauer return 0; 235f53fbde4SSascha Hauer 236d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 237d96be879SSascha Hauer if (sg->offset & 3 || sg->length & 3) { 238d96be879SSascha Hauer host->do_dma = 0; 239656217d2SMartin Fuzzey return 0; 240d96be879SSascha Hauer } 241d96be879SSascha Hauer } 242d96be879SSascha Hauer 243f53fbde4SSascha Hauer if (data->flags & MMC_DATA_READ) 244d96be879SSascha Hauer host->dma_dir = DMA_FROM_DEVICE; 245f53fbde4SSascha Hauer else 246d96be879SSascha Hauer host->dma_dir = DMA_TO_DEVICE; 247f53fbde4SSascha Hauer 248f53fbde4SSascha Hauer nents = dma_map_sg(host->dma->device->dev, data->sg, 249d96be879SSascha Hauer data->sg_len, host->dma_dir); 250f53fbde4SSascha Hauer if (nents != data->sg_len) 251f53fbde4SSascha Hauer return -EINVAL; 252d96be879SSascha Hauer 253f53fbde4SSascha Hauer host->desc = host->dma->device->device_prep_slave_sg(host->dma, 254f53fbde4SSascha Hauer data->sg, data->sg_len, host->dma_dir, 255f53fbde4SSascha Hauer DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 256d96be879SSascha Hauer 257f53fbde4SSascha Hauer if (!host->desc) { 258f53fbde4SSascha Hauer dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len, 259f53fbde4SSascha Hauer host->dma_dir); 260f53fbde4SSascha Hauer host->do_dma = 0; 261f53fbde4SSascha Hauer return 0; /* Fall back to PIO */ 262656217d2SMartin Fuzzey } 263d96be879SSascha Hauer wmb(); 264d96be879SSascha Hauer 265f53fbde4SSascha Hauer dmaengine_submit(host->desc); 266f53fbde4SSascha Hauer 267656217d2SMartin Fuzzey return 0; 268d96be879SSascha Hauer } 269d96be879SSascha Hauer 270d96be879SSascha Hauer static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd, 271d96be879SSascha Hauer unsigned int cmdat) 272d96be879SSascha Hauer { 27316b3bf8cSEric Bénard u32 int_cntr = host->default_irq_mask; 274f441b993SDaniel Mack unsigned long flags; 275f441b993SDaniel Mack 276d96be879SSascha Hauer WARN_ON(host->cmd != NULL); 277d96be879SSascha Hauer host->cmd = cmd; 278d96be879SSascha Hauer 279d96be879SSascha Hauer switch (mmc_resp_type(cmd)) { 280d96be879SSascha Hauer case MMC_RSP_R1: /* short CRC, OPCODE */ 281d96be879SSascha Hauer case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */ 282d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC; 283d96be879SSascha Hauer break; 284d96be879SSascha Hauer case MMC_RSP_R2: /* long 136 bit + CRC */ 285d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_136BIT; 286d96be879SSascha Hauer break; 287d96be879SSascha Hauer case MMC_RSP_R3: /* short */ 288d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_48BIT; 289d96be879SSascha Hauer break; 290d96be879SSascha Hauer case MMC_RSP_NONE: 291d96be879SSascha Hauer break; 292d96be879SSascha Hauer default: 293d96be879SSascha Hauer dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n", 294d96be879SSascha Hauer mmc_resp_type(cmd)); 295d96be879SSascha Hauer cmd->error = -EINVAL; 296d96be879SSascha Hauer return -EINVAL; 297d96be879SSascha Hauer } 298d96be879SSascha Hauer 299f441b993SDaniel Mack int_cntr = INT_END_CMD_RES_EN; 300f441b993SDaniel Mack 301d96be879SSascha Hauer if (mxcmci_use_dma(host)) 302f441b993SDaniel Mack int_cntr |= INT_READ_OP_EN | INT_WRITE_OP_DONE_EN; 303f441b993SDaniel Mack 304f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 305f441b993SDaniel Mack if (host->use_sdio) 306f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 307f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 308f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 309d96be879SSascha Hauer 310d96be879SSascha Hauer writew(cmd->opcode, host->base + MMC_REG_CMD); 311d96be879SSascha Hauer writel(cmd->arg, host->base + MMC_REG_ARG); 312d96be879SSascha Hauer writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT); 313d96be879SSascha Hauer 314d96be879SSascha Hauer return 0; 315d96be879SSascha Hauer } 316d96be879SSascha Hauer 317d96be879SSascha Hauer static void mxcmci_finish_request(struct mxcmci_host *host, 318d96be879SSascha Hauer struct mmc_request *req) 319d96be879SSascha Hauer { 32016b3bf8cSEric Bénard u32 int_cntr = host->default_irq_mask; 321f441b993SDaniel Mack unsigned long flags; 322f441b993SDaniel Mack 323f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 324f441b993SDaniel Mack if (host->use_sdio) 325f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 326f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 327f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 328d96be879SSascha Hauer 329d96be879SSascha Hauer host->req = NULL; 330d96be879SSascha Hauer host->cmd = NULL; 331d96be879SSascha Hauer host->data = NULL; 332d96be879SSascha Hauer 333d96be879SSascha Hauer mmc_request_done(host->mmc, req); 334d96be879SSascha Hauer } 335d96be879SSascha Hauer 336d96be879SSascha Hauer static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat) 337d96be879SSascha Hauer { 338d96be879SSascha Hauer struct mmc_data *data = host->data; 339d96be879SSascha Hauer int data_error; 340d96be879SSascha Hauer 341d96be879SSascha Hauer if (mxcmci_use_dma(host)) { 342f53fbde4SSascha Hauer dmaengine_terminate_all(host->dma); 343f53fbde4SSascha Hauer dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len, 344d96be879SSascha Hauer host->dma_dir); 345d96be879SSascha Hauer } 346d96be879SSascha Hauer 347d96be879SSascha Hauer if (stat & STATUS_ERR_MASK) { 348d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n", 349d96be879SSascha Hauer stat); 350d96be879SSascha Hauer if (stat & STATUS_CRC_READ_ERR) { 3514725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), "%s: -EILSEQ\n", __func__); 352d96be879SSascha Hauer data->error = -EILSEQ; 353d96be879SSascha Hauer } else if (stat & STATUS_CRC_WRITE_ERR) { 354d96be879SSascha Hauer u32 err_code = (stat >> 9) & 0x3; 3554725f6f1SDaniel Mack if (err_code == 2) { /* No CRC response */ 3564725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3574725f6f1SDaniel Mack "%s: No CRC -ETIMEDOUT\n", __func__); 358d96be879SSascha Hauer data->error = -ETIMEDOUT; 359d96be879SSascha Hauer } else { 3604725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3614725f6f1SDaniel Mack "%s: -EILSEQ\n", __func__); 3624725f6f1SDaniel Mack data->error = -EILSEQ; 3634725f6f1SDaniel Mack } 3644725f6f1SDaniel Mack } else if (stat & STATUS_TIME_OUT_READ) { 3654725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3664725f6f1SDaniel Mack "%s: read -ETIMEDOUT\n", __func__); 3674725f6f1SDaniel Mack data->error = -ETIMEDOUT; 3684725f6f1SDaniel Mack } else { 3694725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), "%s: -EIO\n", __func__); 370d96be879SSascha Hauer data->error = -EIO; 371d96be879SSascha Hauer } 372d96be879SSascha Hauer } else { 373d96be879SSascha Hauer data->bytes_xfered = host->datasize; 374d96be879SSascha Hauer } 375d96be879SSascha Hauer 376d96be879SSascha Hauer data_error = data->error; 377d96be879SSascha Hauer 378d96be879SSascha Hauer host->data = NULL; 379d96be879SSascha Hauer 380d96be879SSascha Hauer return data_error; 381d96be879SSascha Hauer } 382d96be879SSascha Hauer 383d96be879SSascha Hauer static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat) 384d96be879SSascha Hauer { 385d96be879SSascha Hauer struct mmc_command *cmd = host->cmd; 386d96be879SSascha Hauer int i; 387d96be879SSascha Hauer u32 a, b, c; 388d96be879SSascha Hauer 389d96be879SSascha Hauer if (!cmd) 390d96be879SSascha Hauer return; 391d96be879SSascha Hauer 392d96be879SSascha Hauer if (stat & STATUS_TIME_OUT_RESP) { 393d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n"); 394d96be879SSascha Hauer cmd->error = -ETIMEDOUT; 395d96be879SSascha Hauer } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) { 396d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "cmd crc error\n"); 397d96be879SSascha Hauer cmd->error = -EILSEQ; 398d96be879SSascha Hauer } 399d96be879SSascha Hauer 400d96be879SSascha Hauer if (cmd->flags & MMC_RSP_PRESENT) { 401d96be879SSascha Hauer if (cmd->flags & MMC_RSP_136) { 402d96be879SSascha Hauer for (i = 0; i < 4; i++) { 403d96be879SSascha Hauer a = readw(host->base + MMC_REG_RES_FIFO); 404d96be879SSascha Hauer b = readw(host->base + MMC_REG_RES_FIFO); 405d96be879SSascha Hauer cmd->resp[i] = a << 16 | b; 406d96be879SSascha Hauer } 407d96be879SSascha Hauer } else { 408d96be879SSascha Hauer a = readw(host->base + MMC_REG_RES_FIFO); 409d96be879SSascha Hauer b = readw(host->base + MMC_REG_RES_FIFO); 410d96be879SSascha Hauer c = readw(host->base + MMC_REG_RES_FIFO); 411d96be879SSascha Hauer cmd->resp[0] = a << 24 | b << 8 | c >> 8; 412d96be879SSascha Hauer } 413d96be879SSascha Hauer } 414d96be879SSascha Hauer } 415d96be879SSascha Hauer 416d96be879SSascha Hauer static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask) 417d96be879SSascha Hauer { 418d96be879SSascha Hauer u32 stat; 419d96be879SSascha Hauer unsigned long timeout = jiffies + HZ; 420d96be879SSascha Hauer 421d96be879SSascha Hauer do { 422d96be879SSascha Hauer stat = readl(host->base + MMC_REG_STATUS); 423d96be879SSascha Hauer if (stat & STATUS_ERR_MASK) 424d96be879SSascha Hauer return stat; 42518489fa2SMartin Fuzzey if (time_after(jiffies, timeout)) { 42618489fa2SMartin Fuzzey mxcmci_softreset(host); 42718489fa2SMartin Fuzzey mxcmci_set_clk_rate(host, host->clock); 428d96be879SSascha Hauer return STATUS_TIME_OUT_READ; 42918489fa2SMartin Fuzzey } 430d96be879SSascha Hauer if (stat & mask) 431d96be879SSascha Hauer return 0; 432d96be879SSascha Hauer cpu_relax(); 433d96be879SSascha Hauer } while (1); 434d96be879SSascha Hauer } 435d96be879SSascha Hauer 436d96be879SSascha Hauer static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes) 437d96be879SSascha Hauer { 438d96be879SSascha Hauer unsigned int stat; 439d96be879SSascha Hauer u32 *buf = _buf; 440d96be879SSascha Hauer 441d96be879SSascha Hauer while (bytes > 3) { 442d96be879SSascha Hauer stat = mxcmci_poll_status(host, 443d96be879SSascha Hauer STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 444d96be879SSascha Hauer if (stat) 445d96be879SSascha Hauer return stat; 446d96be879SSascha Hauer *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS); 447d96be879SSascha Hauer bytes -= 4; 448d96be879SSascha Hauer } 449d96be879SSascha Hauer 450d96be879SSascha Hauer if (bytes) { 451d96be879SSascha Hauer u8 *b = (u8 *)buf; 452d96be879SSascha Hauer u32 tmp; 453d96be879SSascha Hauer 454d96be879SSascha Hauer stat = mxcmci_poll_status(host, 455d96be879SSascha Hauer STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 456d96be879SSascha Hauer if (stat) 457d96be879SSascha Hauer return stat; 458d96be879SSascha Hauer tmp = readl(host->base + MMC_REG_BUFFER_ACCESS); 459d96be879SSascha Hauer memcpy(b, &tmp, bytes); 460d96be879SSascha Hauer } 461d96be879SSascha Hauer 462d96be879SSascha Hauer return 0; 463d96be879SSascha Hauer } 464d96be879SSascha Hauer 465d96be879SSascha Hauer static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes) 466d96be879SSascha Hauer { 467d96be879SSascha Hauer unsigned int stat; 468d96be879SSascha Hauer u32 *buf = _buf; 469d96be879SSascha Hauer 470d96be879SSascha Hauer while (bytes > 3) { 471d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 472d96be879SSascha Hauer if (stat) 473d96be879SSascha Hauer return stat; 474d96be879SSascha Hauer writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS); 475d96be879SSascha Hauer bytes -= 4; 476d96be879SSascha Hauer } 477d96be879SSascha Hauer 478d96be879SSascha Hauer if (bytes) { 479d96be879SSascha Hauer u8 *b = (u8 *)buf; 480d96be879SSascha Hauer u32 tmp; 481d96be879SSascha Hauer 482d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 483d96be879SSascha Hauer if (stat) 484d96be879SSascha Hauer return stat; 485d96be879SSascha Hauer 486d96be879SSascha Hauer memcpy(&tmp, b, bytes); 487d96be879SSascha Hauer writel(tmp, host->base + MMC_REG_BUFFER_ACCESS); 488d96be879SSascha Hauer } 489d96be879SSascha Hauer 490d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 491d96be879SSascha Hauer if (stat) 492d96be879SSascha Hauer return stat; 493d96be879SSascha Hauer 494d96be879SSascha Hauer return 0; 495d96be879SSascha Hauer } 496d96be879SSascha Hauer 497d96be879SSascha Hauer static int mxcmci_transfer_data(struct mxcmci_host *host) 498d96be879SSascha Hauer { 499d96be879SSascha Hauer struct mmc_data *data = host->req->data; 500d96be879SSascha Hauer struct scatterlist *sg; 501d96be879SSascha Hauer int stat, i; 502d96be879SSascha Hauer 503d96be879SSascha Hauer host->data = data; 504d96be879SSascha Hauer host->datasize = 0; 505d96be879SSascha Hauer 506d96be879SSascha Hauer if (data->flags & MMC_DATA_READ) { 507d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 508d96be879SSascha Hauer stat = mxcmci_pull(host, sg_virt(sg), sg->length); 509d96be879SSascha Hauer if (stat) 510d96be879SSascha Hauer return stat; 511d96be879SSascha Hauer host->datasize += sg->length; 512d96be879SSascha Hauer } 513d96be879SSascha Hauer } else { 514d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 515d96be879SSascha Hauer stat = mxcmci_push(host, sg_virt(sg), sg->length); 516d96be879SSascha Hauer if (stat) 517d96be879SSascha Hauer return stat; 518d96be879SSascha Hauer host->datasize += sg->length; 519d96be879SSascha Hauer } 520d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE); 521d96be879SSascha Hauer if (stat) 522d96be879SSascha Hauer return stat; 523d96be879SSascha Hauer } 524d96be879SSascha Hauer return 0; 525d96be879SSascha Hauer } 526d96be879SSascha Hauer 527d96be879SSascha Hauer static void mxcmci_datawork(struct work_struct *work) 528d96be879SSascha Hauer { 529d96be879SSascha Hauer struct mxcmci_host *host = container_of(work, struct mxcmci_host, 530d96be879SSascha Hauer datawork); 531d96be879SSascha Hauer int datastat = mxcmci_transfer_data(host); 5324a31f2efSDaniel Mack 5334a31f2efSDaniel Mack writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 5344a31f2efSDaniel Mack host->base + MMC_REG_STATUS); 535d96be879SSascha Hauer mxcmci_finish_data(host, datastat); 536d96be879SSascha Hauer 537d96be879SSascha Hauer if (host->req->stop) { 538d96be879SSascha Hauer if (mxcmci_start_cmd(host, host->req->stop, 0)) { 539d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 540d96be879SSascha Hauer return; 541d96be879SSascha Hauer } 542d96be879SSascha Hauer } else { 543d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 544d96be879SSascha Hauer } 545d96be879SSascha Hauer } 546d96be879SSascha Hauer 547d96be879SSascha Hauer static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat) 548d96be879SSascha Hauer { 549d96be879SSascha Hauer struct mmc_data *data = host->data; 550d96be879SSascha Hauer int data_error; 551d96be879SSascha Hauer 552d96be879SSascha Hauer if (!data) 553d96be879SSascha Hauer return; 554d96be879SSascha Hauer 555d96be879SSascha Hauer data_error = mxcmci_finish_data(host, stat); 556d96be879SSascha Hauer 557d96be879SSascha Hauer mxcmci_read_response(host, stat); 558d96be879SSascha Hauer host->cmd = NULL; 559d96be879SSascha Hauer 560d96be879SSascha Hauer if (host->req->stop) { 561d96be879SSascha Hauer if (mxcmci_start_cmd(host, host->req->stop, 0)) { 562d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 563d96be879SSascha Hauer return; 564d96be879SSascha Hauer } 565d96be879SSascha Hauer } else { 566d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 567d96be879SSascha Hauer } 568d96be879SSascha Hauer } 569d96be879SSascha Hauer 570d96be879SSascha Hauer static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat) 571d96be879SSascha Hauer { 572d96be879SSascha Hauer mxcmci_read_response(host, stat); 573d96be879SSascha Hauer host->cmd = NULL; 574d96be879SSascha Hauer 575d96be879SSascha Hauer if (!host->data && host->req) { 576d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 577d96be879SSascha Hauer return; 578d96be879SSascha Hauer } 579d96be879SSascha Hauer 580d96be879SSascha Hauer /* For the DMA case the DMA engine handles the data transfer 581fd589a8fSAnand Gadiyar * automatically. For non DMA we have to do it ourselves. 582d96be879SSascha Hauer * Don't do it in interrupt context though. 583d96be879SSascha Hauer */ 584d96be879SSascha Hauer if (!mxcmci_use_dma(host) && host->data) 585d96be879SSascha Hauer schedule_work(&host->datawork); 586d96be879SSascha Hauer 587d96be879SSascha Hauer } 588d96be879SSascha Hauer 589d96be879SSascha Hauer static irqreturn_t mxcmci_irq(int irq, void *devid) 590d96be879SSascha Hauer { 591d96be879SSascha Hauer struct mxcmci_host *host = devid; 592f441b993SDaniel Mack unsigned long flags; 593f441b993SDaniel Mack bool sdio_irq; 594d96be879SSascha Hauer u32 stat; 595d96be879SSascha Hauer 596d96be879SSascha Hauer stat = readl(host->base + MMC_REG_STATUS); 5974a31f2efSDaniel Mack writel(stat & ~(STATUS_SDIO_INT_ACTIVE | STATUS_DATA_TRANS_DONE | 5984a31f2efSDaniel Mack STATUS_WRITE_OP_DONE), host->base + MMC_REG_STATUS); 599d96be879SSascha Hauer 600d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat); 601d96be879SSascha Hauer 602f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 603f441b993SDaniel Mack sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio; 604f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 605f441b993SDaniel Mack 6064a31f2efSDaniel Mack if (mxcmci_use_dma(host) && 6074a31f2efSDaniel Mack (stat & (STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE))) 6084a31f2efSDaniel Mack writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 6094a31f2efSDaniel Mack host->base + MMC_REG_STATUS); 6104a31f2efSDaniel Mack 611f441b993SDaniel Mack if (sdio_irq) { 612f441b993SDaniel Mack writel(STATUS_SDIO_INT_ACTIVE, host->base + MMC_REG_STATUS); 613f441b993SDaniel Mack mmc_signal_sdio_irq(host->mmc); 614f441b993SDaniel Mack } 615f441b993SDaniel Mack 616d96be879SSascha Hauer if (stat & STATUS_END_CMD_RESP) 617d96be879SSascha Hauer mxcmci_cmd_done(host, stat); 618f441b993SDaniel Mack 619d96be879SSascha Hauer if (mxcmci_use_dma(host) && 620d96be879SSascha Hauer (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE))) 621d96be879SSascha Hauer mxcmci_data_done(host, stat); 622f53fbde4SSascha Hauer 62316b3bf8cSEric Bénard if (host->default_irq_mask && 62416b3bf8cSEric Bénard (stat & (STATUS_CARD_INSERTION | STATUS_CARD_REMOVAL))) 62516b3bf8cSEric Bénard mmc_detect_change(host->mmc, msecs_to_jiffies(200)); 626f53fbde4SSascha Hauer 627d96be879SSascha Hauer return IRQ_HANDLED; 628d96be879SSascha Hauer } 629d96be879SSascha Hauer 630d96be879SSascha Hauer static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req) 631d96be879SSascha Hauer { 632d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 633d96be879SSascha Hauer unsigned int cmdat = host->cmdat; 634656217d2SMartin Fuzzey int error; 635d96be879SSascha Hauer 636d96be879SSascha Hauer WARN_ON(host->req != NULL); 637d96be879SSascha Hauer 638d96be879SSascha Hauer host->req = req; 639d96be879SSascha Hauer host->cmdat &= ~CMD_DAT_CONT_INIT; 640f53fbde4SSascha Hauer 641f53fbde4SSascha Hauer if (host->dma) 642d96be879SSascha Hauer host->do_dma = 1; 643f53fbde4SSascha Hauer 644d96be879SSascha Hauer if (req->data) { 645656217d2SMartin Fuzzey error = mxcmci_setup_data(host, req->data); 646656217d2SMartin Fuzzey if (error) { 647656217d2SMartin Fuzzey req->cmd->error = error; 648656217d2SMartin Fuzzey goto out; 649656217d2SMartin Fuzzey } 650656217d2SMartin Fuzzey 651d96be879SSascha Hauer 652d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_DATA_ENABLE; 653d96be879SSascha Hauer 654d96be879SSascha Hauer if (req->data->flags & MMC_DATA_WRITE) 655d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_WRITE; 656d96be879SSascha Hauer } 657d96be879SSascha Hauer 658656217d2SMartin Fuzzey error = mxcmci_start_cmd(host, req->cmd, cmdat); 659f53fbde4SSascha Hauer 660656217d2SMartin Fuzzey out: 661656217d2SMartin Fuzzey if (error) 662d96be879SSascha Hauer mxcmci_finish_request(host, req); 663d96be879SSascha Hauer } 664d96be879SSascha Hauer 665d96be879SSascha Hauer static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios) 666d96be879SSascha Hauer { 667d96be879SSascha Hauer unsigned int divider; 668d96be879SSascha Hauer int prescaler = 0; 669d96be879SSascha Hauer unsigned int clk_in = clk_get_rate(host->clk); 670d96be879SSascha Hauer 671d96be879SSascha Hauer while (prescaler <= 0x800) { 672d96be879SSascha Hauer for (divider = 1; divider <= 0xF; divider++) { 673d96be879SSascha Hauer int x; 674d96be879SSascha Hauer 675d96be879SSascha Hauer x = (clk_in / (divider + 1)); 676d96be879SSascha Hauer 677d96be879SSascha Hauer if (prescaler) 678d96be879SSascha Hauer x /= (prescaler * 2); 679d96be879SSascha Hauer 680d96be879SSascha Hauer if (x <= clk_ios) 681d96be879SSascha Hauer break; 682d96be879SSascha Hauer } 683d96be879SSascha Hauer if (divider < 0x10) 684d96be879SSascha Hauer break; 685d96be879SSascha Hauer 686d96be879SSascha Hauer if (prescaler == 0) 687d96be879SSascha Hauer prescaler = 1; 688d96be879SSascha Hauer else 689d96be879SSascha Hauer prescaler <<= 1; 690d96be879SSascha Hauer } 691d96be879SSascha Hauer 692d96be879SSascha Hauer writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE); 693d96be879SSascha Hauer 694d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n", 695d96be879SSascha Hauer prescaler, divider, clk_in, clk_ios); 696d96be879SSascha Hauer } 697d96be879SSascha Hauer 698f53fbde4SSascha Hauer static int mxcmci_setup_dma(struct mmc_host *mmc) 699f53fbde4SSascha Hauer { 700f53fbde4SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 701f53fbde4SSascha Hauer struct dma_slave_config *config = &host->dma_slave_config; 702f53fbde4SSascha Hauer 703f53fbde4SSascha Hauer config->dst_addr = host->res->start + MMC_REG_BUFFER_ACCESS; 704f53fbde4SSascha Hauer config->src_addr = host->res->start + MMC_REG_BUFFER_ACCESS; 705f53fbde4SSascha Hauer config->dst_addr_width = 4; 706f53fbde4SSascha Hauer config->src_addr_width = 4; 707f53fbde4SSascha Hauer config->dst_maxburst = host->burstlen; 708f53fbde4SSascha Hauer config->src_maxburst = host->burstlen; 709f53fbde4SSascha Hauer 710f53fbde4SSascha Hauer return dmaengine_slave_config(host->dma, config); 711f53fbde4SSascha Hauer } 712f53fbde4SSascha Hauer 713d96be879SSascha Hauer static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 714d96be879SSascha Hauer { 715d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 716f53fbde4SSascha Hauer int burstlen, ret; 717f53fbde4SSascha Hauer 718d96be879SSascha Hauer /* 7196584cb88SSascha Hauer * use burstlen of 64 (16 words) in 4 bit mode (--> reg value 0) 7206584cb88SSascha Hauer * use burstlen of 16 (4 words) in 1 bit mode (--> reg value 16) 721d96be879SSascha Hauer */ 722d96be879SSascha Hauer if (ios->bus_width == MMC_BUS_WIDTH_4) 723f53fbde4SSascha Hauer burstlen = 16; 7246584cb88SSascha Hauer else 7256584cb88SSascha Hauer burstlen = 4; 726d96be879SSascha Hauer 727f53fbde4SSascha Hauer if (mxcmci_use_dma(host) && burstlen != host->burstlen) { 728f53fbde4SSascha Hauer host->burstlen = burstlen; 729f53fbde4SSascha Hauer ret = mxcmci_setup_dma(mmc); 730f53fbde4SSascha Hauer if (ret) { 731f53fbde4SSascha Hauer dev_err(mmc_dev(host->mmc), 732f53fbde4SSascha Hauer "failed to config DMA channel. Falling back to PIO\n"); 733f53fbde4SSascha Hauer dma_release_channel(host->dma); 734f53fbde4SSascha Hauer host->do_dma = 0; 735e58f516fSSascha Hauer host->dma = NULL; 736f53fbde4SSascha Hauer } 737f53fbde4SSascha Hauer } 738f53fbde4SSascha Hauer 739d96be879SSascha Hauer if (ios->bus_width == MMC_BUS_WIDTH_4) 740d96be879SSascha Hauer host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4; 741d96be879SSascha Hauer else 742d96be879SSascha Hauer host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4; 743d96be879SSascha Hauer 744d96be879SSascha Hauer if (host->power_mode != ios->power_mode) { 745d078d242SAlberto Panizzo mxcmci_set_power(host, ios->power_mode, ios->vdd); 746d96be879SSascha Hauer host->power_mode = ios->power_mode; 74774b66954SAlberto Panizzo 748d96be879SSascha Hauer if (ios->power_mode == MMC_POWER_ON) 749d96be879SSascha Hauer host->cmdat |= CMD_DAT_CONT_INIT; 750d96be879SSascha Hauer } 751d96be879SSascha Hauer 752d96be879SSascha Hauer if (ios->clock) { 753d96be879SSascha Hauer mxcmci_set_clk_rate(host, ios->clock); 754d96be879SSascha Hauer writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); 755d96be879SSascha Hauer } else { 756d96be879SSascha Hauer writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK); 757d96be879SSascha Hauer } 758d96be879SSascha Hauer 759d96be879SSascha Hauer host->clock = ios->clock; 760d96be879SSascha Hauer } 761d96be879SSascha Hauer 762d96be879SSascha Hauer static irqreturn_t mxcmci_detect_irq(int irq, void *data) 763d96be879SSascha Hauer { 764d96be879SSascha Hauer struct mmc_host *mmc = data; 765d96be879SSascha Hauer 766d96be879SSascha Hauer dev_dbg(mmc_dev(mmc), "%s\n", __func__); 767d96be879SSascha Hauer 768d96be879SSascha Hauer mmc_detect_change(mmc, msecs_to_jiffies(250)); 769d96be879SSascha Hauer return IRQ_HANDLED; 770d96be879SSascha Hauer } 771d96be879SSascha Hauer 772d96be879SSascha Hauer static int mxcmci_get_ro(struct mmc_host *mmc) 773d96be879SSascha Hauer { 774d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 775d96be879SSascha Hauer 776d96be879SSascha Hauer if (host->pdata && host->pdata->get_ro) 777d96be879SSascha Hauer return !!host->pdata->get_ro(mmc_dev(mmc)); 778d96be879SSascha Hauer /* 779d96be879SSascha Hauer * Board doesn't support read only detection; let the mmc core 780d96be879SSascha Hauer * decide what to do. 781d96be879SSascha Hauer */ 782d96be879SSascha Hauer return -ENOSYS; 783d96be879SSascha Hauer } 784d96be879SSascha Hauer 785f441b993SDaniel Mack static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable) 786f441b993SDaniel Mack { 787f441b993SDaniel Mack struct mxcmci_host *host = mmc_priv(mmc); 788f441b993SDaniel Mack unsigned long flags; 789f441b993SDaniel Mack u32 int_cntr; 790f441b993SDaniel Mack 791f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 792f441b993SDaniel Mack host->use_sdio = enable; 793f441b993SDaniel Mack int_cntr = readl(host->base + MMC_REG_INT_CNTR); 794f441b993SDaniel Mack 795f441b993SDaniel Mack if (enable) 796f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 797f441b993SDaniel Mack else 798f441b993SDaniel Mack int_cntr &= ~INT_SDIO_IRQ_EN; 799f441b993SDaniel Mack 800f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 801f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 802f441b993SDaniel Mack } 803d96be879SSascha Hauer 8043fcb027dSDaniel Mack static void mxcmci_init_card(struct mmc_host *host, struct mmc_card *card) 8053fcb027dSDaniel Mack { 8063fcb027dSDaniel Mack /* 8073fcb027dSDaniel Mack * MX3 SoCs have a silicon bug which corrupts CRC calculation of 8083fcb027dSDaniel Mack * multi-block transfers when connected SDIO peripheral doesn't 8093fcb027dSDaniel Mack * drive the BUSY line as required by the specs. 8103fcb027dSDaniel Mack * One way to prevent this is to only allow 1-bit transfers. 8113fcb027dSDaniel Mack */ 8123fcb027dSDaniel Mack 8133fcb027dSDaniel Mack if (cpu_is_mx3() && card->type == MMC_TYPE_SDIO) 8143fcb027dSDaniel Mack host->caps &= ~MMC_CAP_4_BIT_DATA; 8153fcb027dSDaniel Mack else 8163fcb027dSDaniel Mack host->caps |= MMC_CAP_4_BIT_DATA; 8173fcb027dSDaniel Mack } 8183fcb027dSDaniel Mack 819f53fbde4SSascha Hauer static bool filter(struct dma_chan *chan, void *param) 820f53fbde4SSascha Hauer { 821f53fbde4SSascha Hauer struct mxcmci_host *host = param; 822f53fbde4SSascha Hauer 823f53fbde4SSascha Hauer if (!imx_dma_is_general_purpose(chan)) 824f53fbde4SSascha Hauer return false; 825f53fbde4SSascha Hauer 826f53fbde4SSascha Hauer chan->private = &host->dma_data; 827f53fbde4SSascha Hauer 828f53fbde4SSascha Hauer return true; 829f53fbde4SSascha Hauer } 830f53fbde4SSascha Hauer 831d96be879SSascha Hauer static const struct mmc_host_ops mxcmci_ops = { 832d96be879SSascha Hauer .request = mxcmci_request, 833d96be879SSascha Hauer .set_ios = mxcmci_set_ios, 834d96be879SSascha Hauer .get_ro = mxcmci_get_ro, 835f441b993SDaniel Mack .enable_sdio_irq = mxcmci_enable_sdio_irq, 8363fcb027dSDaniel Mack .init_card = mxcmci_init_card, 837d96be879SSascha Hauer }; 838d96be879SSascha Hauer 839d96be879SSascha Hauer static int mxcmci_probe(struct platform_device *pdev) 840d96be879SSascha Hauer { 841d96be879SSascha Hauer struct mmc_host *mmc; 842d96be879SSascha Hauer struct mxcmci_host *host = NULL; 843c0521bafSUwe Kleine-König struct resource *iores, *r; 844d96be879SSascha Hauer int ret = 0, irq; 845f53fbde4SSascha Hauer dma_cap_mask_t mask; 846d96be879SSascha Hauer 847a3c76eb9SGirish K S pr_info("i.MX SDHC driver\n"); 848d96be879SSascha Hauer 849c0521bafSUwe Kleine-König iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 850d96be879SSascha Hauer irq = platform_get_irq(pdev, 0); 851c0521bafSUwe Kleine-König if (!iores || irq < 0) 852d96be879SSascha Hauer return -EINVAL; 853d96be879SSascha Hauer 854c0521bafSUwe Kleine-König r = request_mem_region(iores->start, resource_size(iores), pdev->name); 855d96be879SSascha Hauer if (!r) 856d96be879SSascha Hauer return -EBUSY; 857d96be879SSascha Hauer 858d96be879SSascha Hauer mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev); 859d96be879SSascha Hauer if (!mmc) { 860d96be879SSascha Hauer ret = -ENOMEM; 861d96be879SSascha Hauer goto out_release_mem; 862d96be879SSascha Hauer } 863d96be879SSascha Hauer 864d96be879SSascha Hauer mmc->ops = &mxcmci_ops; 865f441b993SDaniel Mack mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; 866d96be879SSascha Hauer 867d96be879SSascha Hauer /* MMC core transfer sizes tunable parameters */ 868a36274e0SMartin K. Petersen mmc->max_segs = 64; 869d96be879SSascha Hauer mmc->max_blk_size = 2048; 870d96be879SSascha Hauer mmc->max_blk_count = 65535; 871d96be879SSascha Hauer mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; 872d759c374SVladimir Zapolskiy mmc->max_seg_size = mmc->max_req_size; 873d96be879SSascha Hauer 874d96be879SSascha Hauer host = mmc_priv(mmc); 875d96be879SSascha Hauer host->base = ioremap(r->start, resource_size(r)); 876d96be879SSascha Hauer if (!host->base) { 877d96be879SSascha Hauer ret = -ENOMEM; 878d96be879SSascha Hauer goto out_free; 879d96be879SSascha Hauer } 880d96be879SSascha Hauer 881d96be879SSascha Hauer host->mmc = mmc; 882d96be879SSascha Hauer host->pdata = pdev->dev.platform_data; 883f441b993SDaniel Mack spin_lock_init(&host->lock); 884d96be879SSascha Hauer 88574b66954SAlberto Panizzo mxcmci_init_ocr(host); 886d96be879SSascha Hauer 88716b3bf8cSEric Bénard if (host->pdata && host->pdata->dat3_card_detect) 88816b3bf8cSEric Bénard host->default_irq_mask = 88916b3bf8cSEric Bénard INT_CARD_INSERTION_EN | INT_CARD_REMOVAL_EN; 89016b3bf8cSEric Bénard else 89116b3bf8cSEric Bénard host->default_irq_mask = 0; 89216b3bf8cSEric Bénard 893d96be879SSascha Hauer host->res = r; 894d96be879SSascha Hauer host->irq = irq; 895d96be879SSascha Hauer 89606277b5cSSascha Hauer host->clk = clk_get(&pdev->dev, NULL); 897d96be879SSascha Hauer if (IS_ERR(host->clk)) { 898d96be879SSascha Hauer ret = PTR_ERR(host->clk); 899d96be879SSascha Hauer goto out_iounmap; 900d96be879SSascha Hauer } 901d96be879SSascha Hauer clk_enable(host->clk); 902d96be879SSascha Hauer 903d96be879SSascha Hauer mxcmci_softreset(host); 904d96be879SSascha Hauer 905d96be879SSascha Hauer host->rev_no = readw(host->base + MMC_REG_REV_NO); 906d96be879SSascha Hauer if (host->rev_no != 0x400) { 907d96be879SSascha Hauer ret = -ENODEV; 908d96be879SSascha Hauer dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n", 909d96be879SSascha Hauer host->rev_no); 910d96be879SSascha Hauer goto out_clk_put; 911d96be879SSascha Hauer } 912d96be879SSascha Hauer 913c499b067SSascha Hauer mmc->f_min = clk_get_rate(host->clk) >> 16; 914d96be879SSascha Hauer mmc->f_max = clk_get_rate(host->clk) >> 1; 915d96be879SSascha Hauer 916d96be879SSascha Hauer /* recommended in data sheet */ 917d96be879SSascha Hauer writew(0x2db4, host->base + MMC_REG_READ_TO); 918d96be879SSascha Hauer 91916b3bf8cSEric Bénard writel(host->default_irq_mask, host->base + MMC_REG_INT_CNTR); 920d96be879SSascha Hauer 921d96be879SSascha Hauer r = platform_get_resource(pdev, IORESOURCE_DMA, 0); 922f53fbde4SSascha Hauer if (r) { 923f53fbde4SSascha Hauer host->dmareq = r->start; 924f53fbde4SSascha Hauer host->dma_data.peripheral_type = IMX_DMATYPE_SDHC; 925f53fbde4SSascha Hauer host->dma_data.priority = DMA_PRIO_LOW; 926f53fbde4SSascha Hauer host->dma_data.dma_request = host->dmareq; 927f53fbde4SSascha Hauer dma_cap_zero(mask); 928f53fbde4SSascha Hauer dma_cap_set(DMA_SLAVE, mask); 929f53fbde4SSascha Hauer host->dma = dma_request_channel(mask, filter, host); 930f53fbde4SSascha Hauer if (host->dma) 931f53fbde4SSascha Hauer mmc->max_seg_size = dma_get_max_seg_size( 932f53fbde4SSascha Hauer host->dma->device->dev); 933d96be879SSascha Hauer } 934d96be879SSascha Hauer 935f53fbde4SSascha Hauer if (!host->dma) 936f53fbde4SSascha Hauer dev_info(mmc_dev(host->mmc), "dma not available. Using PIO\n"); 937f53fbde4SSascha Hauer 938d96be879SSascha Hauer INIT_WORK(&host->datawork, mxcmci_datawork); 939d96be879SSascha Hauer 940d96be879SSascha Hauer ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host); 941d96be879SSascha Hauer if (ret) 942d96be879SSascha Hauer goto out_free_dma; 943d96be879SSascha Hauer 944d96be879SSascha Hauer platform_set_drvdata(pdev, mmc); 945d96be879SSascha Hauer 946d96be879SSascha Hauer if (host->pdata && host->pdata->init) { 947d96be879SSascha Hauer ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq, 948d96be879SSascha Hauer host->mmc); 949d96be879SSascha Hauer if (ret) 950d96be879SSascha Hauer goto out_free_irq; 951d96be879SSascha Hauer } 952d96be879SSascha Hauer 953d96be879SSascha Hauer mmc_add_host(mmc); 954d96be879SSascha Hauer 955d96be879SSascha Hauer return 0; 956d96be879SSascha Hauer 957d96be879SSascha Hauer out_free_irq: 958d96be879SSascha Hauer free_irq(host->irq, host); 959d96be879SSascha Hauer out_free_dma: 960f53fbde4SSascha Hauer if (host->dma) 961f53fbde4SSascha Hauer dma_release_channel(host->dma); 962d96be879SSascha Hauer out_clk_put: 963d96be879SSascha Hauer clk_disable(host->clk); 964d96be879SSascha Hauer clk_put(host->clk); 965d96be879SSascha Hauer out_iounmap: 966d96be879SSascha Hauer iounmap(host->base); 967d96be879SSascha Hauer out_free: 968d96be879SSascha Hauer mmc_free_host(mmc); 969d96be879SSascha Hauer out_release_mem: 970c0521bafSUwe Kleine-König release_mem_region(iores->start, resource_size(iores)); 971d96be879SSascha Hauer return ret; 972d96be879SSascha Hauer } 973d96be879SSascha Hauer 974d96be879SSascha Hauer static int mxcmci_remove(struct platform_device *pdev) 975d96be879SSascha Hauer { 976d96be879SSascha Hauer struct mmc_host *mmc = platform_get_drvdata(pdev); 977d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 978d96be879SSascha Hauer 979d96be879SSascha Hauer platform_set_drvdata(pdev, NULL); 980d96be879SSascha Hauer 981d96be879SSascha Hauer mmc_remove_host(mmc); 982d96be879SSascha Hauer 98374b66954SAlberto Panizzo if (host->vcc) 98474b66954SAlberto Panizzo regulator_put(host->vcc); 98574b66954SAlberto Panizzo 986d96be879SSascha Hauer if (host->pdata && host->pdata->exit) 987d96be879SSascha Hauer host->pdata->exit(&pdev->dev, mmc); 988d96be879SSascha Hauer 989d96be879SSascha Hauer free_irq(host->irq, host); 990d96be879SSascha Hauer iounmap(host->base); 991f53fbde4SSascha Hauer 992f53fbde4SSascha Hauer if (host->dma) 993f53fbde4SSascha Hauer dma_release_channel(host->dma); 994f53fbde4SSascha Hauer 995d96be879SSascha Hauer clk_disable(host->clk); 996d96be879SSascha Hauer clk_put(host->clk); 997d96be879SSascha Hauer 998d96be879SSascha Hauer release_mem_region(host->res->start, resource_size(host->res)); 999d96be879SSascha Hauer 1000d96be879SSascha Hauer mmc_free_host(mmc); 1001d96be879SSascha Hauer 1002d96be879SSascha Hauer return 0; 1003d96be879SSascha Hauer } 1004d96be879SSascha Hauer 1005d96be879SSascha Hauer #ifdef CONFIG_PM 1006a7d403cfSEric Bénard static int mxcmci_suspend(struct device *dev) 1007d96be879SSascha Hauer { 1008a7d403cfSEric Bénard struct mmc_host *mmc = dev_get_drvdata(dev); 1009a7d403cfSEric Bénard struct mxcmci_host *host = mmc_priv(mmc); 1010d96be879SSascha Hauer int ret = 0; 1011d96be879SSascha Hauer 1012d96be879SSascha Hauer if (mmc) 10131a13f8faSMatt Fleming ret = mmc_suspend_host(mmc); 1014a7d403cfSEric Bénard clk_disable(host->clk); 1015d96be879SSascha Hauer 1016d96be879SSascha Hauer return ret; 1017d96be879SSascha Hauer } 1018d96be879SSascha Hauer 1019a7d403cfSEric Bénard static int mxcmci_resume(struct device *dev) 1020d96be879SSascha Hauer { 1021a7d403cfSEric Bénard struct mmc_host *mmc = dev_get_drvdata(dev); 1022a7d403cfSEric Bénard struct mxcmci_host *host = mmc_priv(mmc); 1023d96be879SSascha Hauer int ret = 0; 1024d96be879SSascha Hauer 1025a7d403cfSEric Bénard clk_enable(host->clk); 1026a7d403cfSEric Bénard if (mmc) 1027d96be879SSascha Hauer ret = mmc_resume_host(mmc); 1028d96be879SSascha Hauer 1029d96be879SSascha Hauer return ret; 1030d96be879SSascha Hauer } 1031a7d403cfSEric Bénard 1032a7d403cfSEric Bénard static const struct dev_pm_ops mxcmci_pm_ops = { 1033a7d403cfSEric Bénard .suspend = mxcmci_suspend, 1034a7d403cfSEric Bénard .resume = mxcmci_resume, 1035a7d403cfSEric Bénard }; 1036a7d403cfSEric Bénard #endif 1037d96be879SSascha Hauer 1038d96be879SSascha Hauer static struct platform_driver mxcmci_driver = { 1039d96be879SSascha Hauer .probe = mxcmci_probe, 1040d96be879SSascha Hauer .remove = mxcmci_remove, 1041d96be879SSascha Hauer .driver = { 1042d96be879SSascha Hauer .name = DRIVER_NAME, 1043d96be879SSascha Hauer .owner = THIS_MODULE, 1044a7d403cfSEric Bénard #ifdef CONFIG_PM 1045a7d403cfSEric Bénard .pm = &mxcmci_pm_ops, 1046a7d403cfSEric Bénard #endif 1047d96be879SSascha Hauer } 1048d96be879SSascha Hauer }; 1049d96be879SSascha Hauer 1050d96be879SSascha Hauer static int __init mxcmci_init(void) 1051d96be879SSascha Hauer { 1052d96be879SSascha Hauer return platform_driver_register(&mxcmci_driver); 1053d96be879SSascha Hauer } 1054d96be879SSascha Hauer 1055d96be879SSascha Hauer static void __exit mxcmci_exit(void) 1056d96be879SSascha Hauer { 1057d96be879SSascha Hauer platform_driver_unregister(&mxcmci_driver); 1058d96be879SSascha Hauer } 1059d96be879SSascha Hauer 1060d96be879SSascha Hauer module_init(mxcmci_init); 1061d96be879SSascha Hauer module_exit(mxcmci_exit); 1062d96be879SSascha Hauer 1063d96be879SSascha Hauer MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver"); 1064d96be879SSascha Hauer MODULE_AUTHOR("Sascha Hauer, Pengutronix"); 1065d96be879SSascha Hauer MODULE_LICENSE("GPL"); 1066d96be879SSascha Hauer MODULE_ALIAS("platform:imx-mmc"); 1067