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> 36258aea76SViresh Kumar #include <linux/types.h> 37d96be879SSascha Hauer 38d96be879SSascha Hauer #include <asm/dma.h> 39d96be879SSascha Hauer #include <asm/irq.h> 40d96be879SSascha Hauer #include <asm/sizes.h> 4182906b13SArnd Bergmann #include <linux/platform_data/mmc-mxcmmc.h> 42d96be879SSascha Hauer 4382906b13SArnd Bergmann #include <linux/platform_data/dma-imx.h> 44edae8998SShawn Guo #include <mach/hardware.h> 45d96be879SSascha Hauer 469563b1dbSSascha Hauer #define DRIVER_NAME "mxc-mmc" 47f6ad0a48SJavier Martin #define MXCMCI_TIMEOUT_MS 10000 48d96be879SSascha Hauer 49d96be879SSascha Hauer #define MMC_REG_STR_STP_CLK 0x00 50d96be879SSascha Hauer #define MMC_REG_STATUS 0x04 51d96be879SSascha Hauer #define MMC_REG_CLK_RATE 0x08 52d96be879SSascha Hauer #define MMC_REG_CMD_DAT_CONT 0x0C 53d96be879SSascha Hauer #define MMC_REG_RES_TO 0x10 54d96be879SSascha Hauer #define MMC_REG_READ_TO 0x14 55d96be879SSascha Hauer #define MMC_REG_BLK_LEN 0x18 56d96be879SSascha Hauer #define MMC_REG_NOB 0x1C 57d96be879SSascha Hauer #define MMC_REG_REV_NO 0x20 58d96be879SSascha Hauer #define MMC_REG_INT_CNTR 0x24 59d96be879SSascha Hauer #define MMC_REG_CMD 0x28 60d96be879SSascha Hauer #define MMC_REG_ARG 0x2C 61d96be879SSascha Hauer #define MMC_REG_RES_FIFO 0x34 62d96be879SSascha Hauer #define MMC_REG_BUFFER_ACCESS 0x38 63d96be879SSascha Hauer 64d96be879SSascha Hauer #define STR_STP_CLK_RESET (1 << 3) 65d96be879SSascha Hauer #define STR_STP_CLK_START_CLK (1 << 1) 66d96be879SSascha Hauer #define STR_STP_CLK_STOP_CLK (1 << 0) 67d96be879SSascha Hauer 68d96be879SSascha Hauer #define STATUS_CARD_INSERTION (1 << 31) 69d96be879SSascha Hauer #define STATUS_CARD_REMOVAL (1 << 30) 70d96be879SSascha Hauer #define STATUS_YBUF_EMPTY (1 << 29) 71d96be879SSascha Hauer #define STATUS_XBUF_EMPTY (1 << 28) 72d96be879SSascha Hauer #define STATUS_YBUF_FULL (1 << 27) 73d96be879SSascha Hauer #define STATUS_XBUF_FULL (1 << 26) 74d96be879SSascha Hauer #define STATUS_BUF_UND_RUN (1 << 25) 75d96be879SSascha Hauer #define STATUS_BUF_OVFL (1 << 24) 76d96be879SSascha Hauer #define STATUS_SDIO_INT_ACTIVE (1 << 14) 77d96be879SSascha Hauer #define STATUS_END_CMD_RESP (1 << 13) 78d96be879SSascha Hauer #define STATUS_WRITE_OP_DONE (1 << 12) 79d96be879SSascha Hauer #define STATUS_DATA_TRANS_DONE (1 << 11) 80d96be879SSascha Hauer #define STATUS_READ_OP_DONE (1 << 11) 81d96be879SSascha Hauer #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10) 82d96be879SSascha Hauer #define STATUS_CARD_BUS_CLK_RUN (1 << 8) 83d96be879SSascha Hauer #define STATUS_BUF_READ_RDY (1 << 7) 84d96be879SSascha Hauer #define STATUS_BUF_WRITE_RDY (1 << 6) 85d96be879SSascha Hauer #define STATUS_RESP_CRC_ERR (1 << 5) 86d96be879SSascha Hauer #define STATUS_CRC_READ_ERR (1 << 3) 87d96be879SSascha Hauer #define STATUS_CRC_WRITE_ERR (1 << 2) 88d96be879SSascha Hauer #define STATUS_TIME_OUT_RESP (1 << 1) 89d96be879SSascha Hauer #define STATUS_TIME_OUT_READ (1 << 0) 90d96be879SSascha Hauer #define STATUS_ERR_MASK 0x2f 91d96be879SSascha Hauer 92d96be879SSascha Hauer #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12) 93d96be879SSascha Hauer #define CMD_DAT_CONT_STOP_READWAIT (1 << 11) 94d96be879SSascha Hauer #define CMD_DAT_CONT_START_READWAIT (1 << 10) 95d96be879SSascha Hauer #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8) 96d96be879SSascha Hauer #define CMD_DAT_CONT_INIT (1 << 7) 97d96be879SSascha Hauer #define CMD_DAT_CONT_WRITE (1 << 4) 98d96be879SSascha Hauer #define CMD_DAT_CONT_DATA_ENABLE (1 << 3) 99d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0) 100d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0) 101d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0) 102d96be879SSascha Hauer 103d96be879SSascha Hauer #define INT_SDIO_INT_WKP_EN (1 << 18) 104d96be879SSascha Hauer #define INT_CARD_INSERTION_WKP_EN (1 << 17) 105d96be879SSascha Hauer #define INT_CARD_REMOVAL_WKP_EN (1 << 16) 106d96be879SSascha Hauer #define INT_CARD_INSERTION_EN (1 << 15) 107d96be879SSascha Hauer #define INT_CARD_REMOVAL_EN (1 << 14) 108d96be879SSascha Hauer #define INT_SDIO_IRQ_EN (1 << 13) 109d96be879SSascha Hauer #define INT_DAT0_EN (1 << 12) 110d96be879SSascha Hauer #define INT_BUF_READ_EN (1 << 4) 111d96be879SSascha Hauer #define INT_BUF_WRITE_EN (1 << 3) 112d96be879SSascha Hauer #define INT_END_CMD_RES_EN (1 << 2) 113d96be879SSascha Hauer #define INT_WRITE_OP_DONE_EN (1 << 1) 114d96be879SSascha Hauer #define INT_READ_OP_EN (1 << 0) 115d96be879SSascha Hauer 116d96be879SSascha Hauer struct mxcmci_host { 117d96be879SSascha Hauer struct mmc_host *mmc; 118d96be879SSascha Hauer struct resource *res; 119d96be879SSascha Hauer void __iomem *base; 120d96be879SSascha Hauer int irq; 121d96be879SSascha Hauer int detect_irq; 122f53fbde4SSascha Hauer struct dma_chan *dma; 123f53fbde4SSascha Hauer struct dma_async_tx_descriptor *desc; 124d96be879SSascha Hauer int do_dma; 12516b3bf8cSEric Bénard int default_irq_mask; 126f441b993SDaniel Mack int use_sdio; 127d96be879SSascha Hauer unsigned int power_mode; 128d96be879SSascha Hauer struct imxmmc_platform_data *pdata; 129d96be879SSascha Hauer 130d96be879SSascha Hauer struct mmc_request *req; 131d96be879SSascha Hauer struct mmc_command *cmd; 132d96be879SSascha Hauer struct mmc_data *data; 133d96be879SSascha Hauer 134d96be879SSascha Hauer unsigned int datasize; 135d96be879SSascha Hauer unsigned int dma_dir; 136d96be879SSascha Hauer 137d96be879SSascha Hauer u16 rev_no; 138d96be879SSascha Hauer unsigned int cmdat; 139d96be879SSascha Hauer 140529aa29eSSascha Hauer struct clk *clk_ipg; 141529aa29eSSascha Hauer struct clk *clk_per; 142d96be879SSascha Hauer 143d96be879SSascha Hauer int clock; 144d96be879SSascha Hauer 145d96be879SSascha Hauer struct work_struct datawork; 146f441b993SDaniel Mack spinlock_t lock; 14774b66954SAlberto Panizzo 14874b66954SAlberto Panizzo struct regulator *vcc; 149f53fbde4SSascha Hauer 150f53fbde4SSascha Hauer int burstlen; 151f53fbde4SSascha Hauer int dmareq; 152f53fbde4SSascha Hauer struct dma_slave_config dma_slave_config; 153f53fbde4SSascha Hauer struct imx_dma_data dma_data; 154f6ad0a48SJavier Martin 155f6ad0a48SJavier Martin struct timer_list watchdog; 156d96be879SSascha Hauer }; 157d96be879SSascha Hauer 15818489fa2SMartin Fuzzey static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios); 15918489fa2SMartin Fuzzey 16074b66954SAlberto Panizzo static inline void mxcmci_init_ocr(struct mxcmci_host *host) 16174b66954SAlberto Panizzo { 16274b66954SAlberto Panizzo host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc"); 16374b66954SAlberto Panizzo 16474b66954SAlberto Panizzo if (IS_ERR(host->vcc)) { 16574b66954SAlberto Panizzo host->vcc = NULL; 16674b66954SAlberto Panizzo } else { 16774b66954SAlberto Panizzo host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc); 16874b66954SAlberto Panizzo if (host->pdata && host->pdata->ocr_avail) 16974b66954SAlberto Panizzo dev_warn(mmc_dev(host->mmc), 17074b66954SAlberto Panizzo "pdata->ocr_avail will not be used\n"); 17174b66954SAlberto Panizzo } 172d078d242SAlberto Panizzo 17374b66954SAlberto Panizzo if (host->vcc == NULL) { 17474b66954SAlberto Panizzo /* fall-back to platform data */ 17574b66954SAlberto Panizzo if (host->pdata && host->pdata->ocr_avail) 17674b66954SAlberto Panizzo host->mmc->ocr_avail = host->pdata->ocr_avail; 17774b66954SAlberto Panizzo else 17874b66954SAlberto Panizzo host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 17974b66954SAlberto Panizzo } 18074b66954SAlberto Panizzo } 18174b66954SAlberto Panizzo 182d078d242SAlberto Panizzo static inline void mxcmci_set_power(struct mxcmci_host *host, 183d078d242SAlberto Panizzo unsigned char power_mode, 184d078d242SAlberto Panizzo unsigned int vdd) 18574b66954SAlberto Panizzo { 186d078d242SAlberto Panizzo if (host->vcc) { 187d078d242SAlberto Panizzo if (power_mode == MMC_POWER_UP) 188d078d242SAlberto Panizzo mmc_regulator_set_ocr(host->mmc, host->vcc, vdd); 189d078d242SAlberto Panizzo else if (power_mode == MMC_POWER_OFF) 190d078d242SAlberto Panizzo mmc_regulator_set_ocr(host->mmc, host->vcc, 0); 191d078d242SAlberto Panizzo } 192d078d242SAlberto Panizzo 19374b66954SAlberto Panizzo if (host->pdata && host->pdata->setpower) 19474b66954SAlberto Panizzo host->pdata->setpower(mmc_dev(host->mmc), vdd); 19574b66954SAlberto Panizzo } 19674b66954SAlberto Panizzo 197d96be879SSascha Hauer static inline int mxcmci_use_dma(struct mxcmci_host *host) 198d96be879SSascha Hauer { 199d96be879SSascha Hauer return host->do_dma; 200d96be879SSascha Hauer } 201d96be879SSascha Hauer 202d96be879SSascha Hauer static void mxcmci_softreset(struct mxcmci_host *host) 203d96be879SSascha Hauer { 204d96be879SSascha Hauer int i; 205d96be879SSascha Hauer 2064725f6f1SDaniel Mack dev_dbg(mmc_dev(host->mmc), "mxcmci_softreset\n"); 2074725f6f1SDaniel Mack 208d96be879SSascha Hauer /* reset sequence */ 209d96be879SSascha Hauer writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK); 210d96be879SSascha Hauer writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK, 211d96be879SSascha Hauer host->base + MMC_REG_STR_STP_CLK); 212d96be879SSascha Hauer 213d96be879SSascha Hauer for (i = 0; i < 8; i++) 214d96be879SSascha Hauer writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); 215d96be879SSascha Hauer 216d96be879SSascha Hauer writew(0xff, host->base + MMC_REG_RES_TO); 217d96be879SSascha Hauer } 218f53fbde4SSascha Hauer static int mxcmci_setup_dma(struct mmc_host *mmc); 219d96be879SSascha Hauer 220656217d2SMartin Fuzzey static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data) 221d96be879SSascha Hauer { 222d96be879SSascha Hauer unsigned int nob = data->blocks; 223d96be879SSascha Hauer unsigned int blksz = data->blksz; 224d96be879SSascha Hauer unsigned int datasize = nob * blksz; 225d96be879SSascha Hauer struct scatterlist *sg; 22605f5799cSVinod Koul enum dma_transfer_direction slave_dirn; 227f53fbde4SSascha Hauer int i, nents; 228f53fbde4SSascha Hauer 229d96be879SSascha Hauer if (data->flags & MMC_DATA_STREAM) 230d96be879SSascha Hauer nob = 0xffff; 231d96be879SSascha Hauer 232d96be879SSascha Hauer host->data = data; 233d96be879SSascha Hauer data->bytes_xfered = 0; 234d96be879SSascha Hauer 235d96be879SSascha Hauer writew(nob, host->base + MMC_REG_NOB); 236d96be879SSascha Hauer writew(blksz, host->base + MMC_REG_BLK_LEN); 237d96be879SSascha Hauer host->datasize = datasize; 238d96be879SSascha Hauer 239f53fbde4SSascha Hauer if (!mxcmci_use_dma(host)) 240f53fbde4SSascha Hauer return 0; 241f53fbde4SSascha Hauer 242d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 243d96be879SSascha Hauer if (sg->offset & 3 || sg->length & 3) { 244d96be879SSascha Hauer host->do_dma = 0; 245656217d2SMartin Fuzzey return 0; 246d96be879SSascha Hauer } 247d96be879SSascha Hauer } 248d96be879SSascha Hauer 24905f5799cSVinod Koul if (data->flags & MMC_DATA_READ) { 250d96be879SSascha Hauer host->dma_dir = DMA_FROM_DEVICE; 25105f5799cSVinod Koul slave_dirn = DMA_DEV_TO_MEM; 25205f5799cSVinod Koul } else { 253d96be879SSascha Hauer host->dma_dir = DMA_TO_DEVICE; 25405f5799cSVinod Koul slave_dirn = DMA_MEM_TO_DEV; 25505f5799cSVinod Koul } 256f53fbde4SSascha Hauer 257f53fbde4SSascha Hauer nents = dma_map_sg(host->dma->device->dev, data->sg, 258d96be879SSascha Hauer data->sg_len, host->dma_dir); 259f53fbde4SSascha Hauer if (nents != data->sg_len) 260f53fbde4SSascha Hauer return -EINVAL; 261d96be879SSascha Hauer 26216052827SAlexandre Bounine host->desc = dmaengine_prep_slave_sg(host->dma, 26305f5799cSVinod Koul data->sg, data->sg_len, slave_dirn, 264f53fbde4SSascha Hauer DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 265d96be879SSascha Hauer 266f53fbde4SSascha Hauer if (!host->desc) { 267f53fbde4SSascha Hauer dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len, 268f53fbde4SSascha Hauer host->dma_dir); 269f53fbde4SSascha Hauer host->do_dma = 0; 270f53fbde4SSascha Hauer return 0; /* Fall back to PIO */ 271656217d2SMartin Fuzzey } 272d96be879SSascha Hauer wmb(); 273d96be879SSascha Hauer 274f53fbde4SSascha Hauer dmaengine_submit(host->desc); 275439aa0efSSascha Hauer dma_async_issue_pending(host->dma); 276f53fbde4SSascha Hauer 277f6ad0a48SJavier Martin mod_timer(&host->watchdog, jiffies + msecs_to_jiffies(MXCMCI_TIMEOUT_MS)); 278f6ad0a48SJavier Martin 279656217d2SMartin Fuzzey return 0; 280d96be879SSascha Hauer } 281d96be879SSascha Hauer 282f6ad0a48SJavier Martin static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat); 283f6ad0a48SJavier Martin static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat); 284f6ad0a48SJavier Martin 285f6ad0a48SJavier Martin static void mxcmci_dma_callback(void *data) 286f6ad0a48SJavier Martin { 287f6ad0a48SJavier Martin struct mxcmci_host *host = data; 288f6ad0a48SJavier Martin u32 stat; 289f6ad0a48SJavier Martin 290f6ad0a48SJavier Martin del_timer(&host->watchdog); 291f6ad0a48SJavier Martin 292f6ad0a48SJavier Martin stat = readl(host->base + MMC_REG_STATUS); 293f6ad0a48SJavier Martin writel(stat & ~STATUS_DATA_TRANS_DONE, host->base + MMC_REG_STATUS); 294f6ad0a48SJavier Martin 295f6ad0a48SJavier Martin dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat); 296f6ad0a48SJavier Martin 297f6ad0a48SJavier Martin if (stat & STATUS_READ_OP_DONE) 298f6ad0a48SJavier Martin writel(STATUS_READ_OP_DONE, host->base + MMC_REG_STATUS); 299f6ad0a48SJavier Martin 300f6ad0a48SJavier Martin mxcmci_data_done(host, stat); 301f6ad0a48SJavier Martin } 302f6ad0a48SJavier Martin 303d96be879SSascha Hauer static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd, 304d96be879SSascha Hauer unsigned int cmdat) 305d96be879SSascha Hauer { 30616b3bf8cSEric Bénard u32 int_cntr = host->default_irq_mask; 307f441b993SDaniel Mack unsigned long flags; 308f441b993SDaniel Mack 309d96be879SSascha Hauer WARN_ON(host->cmd != NULL); 310d96be879SSascha Hauer host->cmd = cmd; 311d96be879SSascha Hauer 312d96be879SSascha Hauer switch (mmc_resp_type(cmd)) { 313d96be879SSascha Hauer case MMC_RSP_R1: /* short CRC, OPCODE */ 314d96be879SSascha Hauer case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */ 315d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC; 316d96be879SSascha Hauer break; 317d96be879SSascha Hauer case MMC_RSP_R2: /* long 136 bit + CRC */ 318d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_136BIT; 319d96be879SSascha Hauer break; 320d96be879SSascha Hauer case MMC_RSP_R3: /* short */ 321d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_48BIT; 322d96be879SSascha Hauer break; 323d96be879SSascha Hauer case MMC_RSP_NONE: 324d96be879SSascha Hauer break; 325d96be879SSascha Hauer default: 326d96be879SSascha Hauer dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n", 327d96be879SSascha Hauer mmc_resp_type(cmd)); 328d96be879SSascha Hauer cmd->error = -EINVAL; 329d96be879SSascha Hauer return -EINVAL; 330d96be879SSascha Hauer } 331d96be879SSascha Hauer 332f441b993SDaniel Mack int_cntr = INT_END_CMD_RES_EN; 333f441b993SDaniel Mack 334f6ad0a48SJavier Martin if (mxcmci_use_dma(host)) { 335f6ad0a48SJavier Martin if (host->dma_dir == DMA_FROM_DEVICE) { 336f6ad0a48SJavier Martin host->desc->callback = mxcmci_dma_callback; 337f6ad0a48SJavier Martin host->desc->callback_param = host; 338f6ad0a48SJavier Martin } else { 339f6ad0a48SJavier Martin int_cntr |= INT_WRITE_OP_DONE_EN; 340f6ad0a48SJavier Martin } 341f6ad0a48SJavier Martin } 342f441b993SDaniel Mack 343f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 344f441b993SDaniel Mack if (host->use_sdio) 345f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 346f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 347f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 348d96be879SSascha Hauer 349d96be879SSascha Hauer writew(cmd->opcode, host->base + MMC_REG_CMD); 350d96be879SSascha Hauer writel(cmd->arg, host->base + MMC_REG_ARG); 351d96be879SSascha Hauer writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT); 352d96be879SSascha Hauer 353d96be879SSascha Hauer return 0; 354d96be879SSascha Hauer } 355d96be879SSascha Hauer 356d96be879SSascha Hauer static void mxcmci_finish_request(struct mxcmci_host *host, 357d96be879SSascha Hauer struct mmc_request *req) 358d96be879SSascha Hauer { 35916b3bf8cSEric Bénard u32 int_cntr = host->default_irq_mask; 360f441b993SDaniel Mack unsigned long flags; 361f441b993SDaniel Mack 362f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 363f441b993SDaniel Mack if (host->use_sdio) 364f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 365f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 366f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 367d96be879SSascha Hauer 368d96be879SSascha Hauer host->req = NULL; 369d96be879SSascha Hauer host->cmd = NULL; 370d96be879SSascha Hauer host->data = NULL; 371d96be879SSascha Hauer 372d96be879SSascha Hauer mmc_request_done(host->mmc, req); 373d96be879SSascha Hauer } 374d96be879SSascha Hauer 375d96be879SSascha Hauer static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat) 376d96be879SSascha Hauer { 377d96be879SSascha Hauer struct mmc_data *data = host->data; 378d96be879SSascha Hauer int data_error; 379d96be879SSascha Hauer 380f6ad0a48SJavier Martin if (mxcmci_use_dma(host)) 381f53fbde4SSascha Hauer dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len, 382d96be879SSascha Hauer host->dma_dir); 383d96be879SSascha Hauer 384d96be879SSascha Hauer if (stat & STATUS_ERR_MASK) { 385d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n", 386d96be879SSascha Hauer stat); 387d96be879SSascha Hauer if (stat & STATUS_CRC_READ_ERR) { 3884725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), "%s: -EILSEQ\n", __func__); 389d96be879SSascha Hauer data->error = -EILSEQ; 390d96be879SSascha Hauer } else if (stat & STATUS_CRC_WRITE_ERR) { 391d96be879SSascha Hauer u32 err_code = (stat >> 9) & 0x3; 3924725f6f1SDaniel Mack if (err_code == 2) { /* No CRC response */ 3934725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3944725f6f1SDaniel Mack "%s: No CRC -ETIMEDOUT\n", __func__); 395d96be879SSascha Hauer data->error = -ETIMEDOUT; 396d96be879SSascha Hauer } else { 3974725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3984725f6f1SDaniel Mack "%s: -EILSEQ\n", __func__); 3994725f6f1SDaniel Mack data->error = -EILSEQ; 4004725f6f1SDaniel Mack } 4014725f6f1SDaniel Mack } else if (stat & STATUS_TIME_OUT_READ) { 4024725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 4034725f6f1SDaniel Mack "%s: read -ETIMEDOUT\n", __func__); 4044725f6f1SDaniel Mack data->error = -ETIMEDOUT; 4054725f6f1SDaniel Mack } else { 4064725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), "%s: -EIO\n", __func__); 407d96be879SSascha Hauer data->error = -EIO; 408d96be879SSascha Hauer } 409d96be879SSascha Hauer } else { 410d96be879SSascha Hauer data->bytes_xfered = host->datasize; 411d96be879SSascha Hauer } 412d96be879SSascha Hauer 413d96be879SSascha Hauer data_error = data->error; 414d96be879SSascha Hauer 415d96be879SSascha Hauer host->data = NULL; 416d96be879SSascha Hauer 417d96be879SSascha Hauer return data_error; 418d96be879SSascha Hauer } 419d96be879SSascha Hauer 420d96be879SSascha Hauer static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat) 421d96be879SSascha Hauer { 422d96be879SSascha Hauer struct mmc_command *cmd = host->cmd; 423d96be879SSascha Hauer int i; 424d96be879SSascha Hauer u32 a, b, c; 425d96be879SSascha Hauer 426d96be879SSascha Hauer if (!cmd) 427d96be879SSascha Hauer return; 428d96be879SSascha Hauer 429d96be879SSascha Hauer if (stat & STATUS_TIME_OUT_RESP) { 430d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n"); 431d96be879SSascha Hauer cmd->error = -ETIMEDOUT; 432d96be879SSascha Hauer } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) { 433d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "cmd crc error\n"); 434d96be879SSascha Hauer cmd->error = -EILSEQ; 435d96be879SSascha Hauer } 436d96be879SSascha Hauer 437d96be879SSascha Hauer if (cmd->flags & MMC_RSP_PRESENT) { 438d96be879SSascha Hauer if (cmd->flags & MMC_RSP_136) { 439d96be879SSascha Hauer for (i = 0; i < 4; i++) { 440d96be879SSascha Hauer a = readw(host->base + MMC_REG_RES_FIFO); 441d96be879SSascha Hauer b = readw(host->base + MMC_REG_RES_FIFO); 442d96be879SSascha Hauer cmd->resp[i] = a << 16 | b; 443d96be879SSascha Hauer } 444d96be879SSascha Hauer } else { 445d96be879SSascha Hauer a = readw(host->base + MMC_REG_RES_FIFO); 446d96be879SSascha Hauer b = readw(host->base + MMC_REG_RES_FIFO); 447d96be879SSascha Hauer c = readw(host->base + MMC_REG_RES_FIFO); 448d96be879SSascha Hauer cmd->resp[0] = a << 24 | b << 8 | c >> 8; 449d96be879SSascha Hauer } 450d96be879SSascha Hauer } 451d96be879SSascha Hauer } 452d96be879SSascha Hauer 453d96be879SSascha Hauer static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask) 454d96be879SSascha Hauer { 455d96be879SSascha Hauer u32 stat; 456d96be879SSascha Hauer unsigned long timeout = jiffies + HZ; 457d96be879SSascha Hauer 458d96be879SSascha Hauer do { 459d96be879SSascha Hauer stat = readl(host->base + MMC_REG_STATUS); 460d96be879SSascha Hauer if (stat & STATUS_ERR_MASK) 461d96be879SSascha Hauer return stat; 46218489fa2SMartin Fuzzey if (time_after(jiffies, timeout)) { 46318489fa2SMartin Fuzzey mxcmci_softreset(host); 46418489fa2SMartin Fuzzey mxcmci_set_clk_rate(host, host->clock); 465d96be879SSascha Hauer return STATUS_TIME_OUT_READ; 46618489fa2SMartin Fuzzey } 467d96be879SSascha Hauer if (stat & mask) 468d96be879SSascha Hauer return 0; 469d96be879SSascha Hauer cpu_relax(); 470d96be879SSascha Hauer } while (1); 471d96be879SSascha Hauer } 472d96be879SSascha Hauer 473d96be879SSascha Hauer static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes) 474d96be879SSascha Hauer { 475d96be879SSascha Hauer unsigned int stat; 476d96be879SSascha Hauer u32 *buf = _buf; 477d96be879SSascha Hauer 478d96be879SSascha Hauer while (bytes > 3) { 479d96be879SSascha Hauer stat = mxcmci_poll_status(host, 480d96be879SSascha Hauer STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 481d96be879SSascha Hauer if (stat) 482d96be879SSascha Hauer return stat; 483d96be879SSascha Hauer *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS); 484d96be879SSascha Hauer bytes -= 4; 485d96be879SSascha Hauer } 486d96be879SSascha Hauer 487d96be879SSascha Hauer if (bytes) { 488d96be879SSascha Hauer u8 *b = (u8 *)buf; 489d96be879SSascha Hauer u32 tmp; 490d96be879SSascha Hauer 491d96be879SSascha Hauer stat = mxcmci_poll_status(host, 492d96be879SSascha Hauer STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 493d96be879SSascha Hauer if (stat) 494d96be879SSascha Hauer return stat; 495d96be879SSascha Hauer tmp = readl(host->base + MMC_REG_BUFFER_ACCESS); 496d96be879SSascha Hauer memcpy(b, &tmp, bytes); 497d96be879SSascha Hauer } 498d96be879SSascha Hauer 499d96be879SSascha Hauer return 0; 500d96be879SSascha Hauer } 501d96be879SSascha Hauer 502d96be879SSascha Hauer static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes) 503d96be879SSascha Hauer { 504d96be879SSascha Hauer unsigned int stat; 505d96be879SSascha Hauer u32 *buf = _buf; 506d96be879SSascha Hauer 507d96be879SSascha Hauer while (bytes > 3) { 508d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 509d96be879SSascha Hauer if (stat) 510d96be879SSascha Hauer return stat; 511d96be879SSascha Hauer writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS); 512d96be879SSascha Hauer bytes -= 4; 513d96be879SSascha Hauer } 514d96be879SSascha Hauer 515d96be879SSascha Hauer if (bytes) { 516d96be879SSascha Hauer u8 *b = (u8 *)buf; 517d96be879SSascha Hauer u32 tmp; 518d96be879SSascha Hauer 519d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 520d96be879SSascha Hauer if (stat) 521d96be879SSascha Hauer return stat; 522d96be879SSascha Hauer 523d96be879SSascha Hauer memcpy(&tmp, b, bytes); 524d96be879SSascha Hauer writel(tmp, host->base + MMC_REG_BUFFER_ACCESS); 525d96be879SSascha Hauer } 526d96be879SSascha Hauer 527d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 528d96be879SSascha Hauer if (stat) 529d96be879SSascha Hauer return stat; 530d96be879SSascha Hauer 531d96be879SSascha Hauer return 0; 532d96be879SSascha Hauer } 533d96be879SSascha Hauer 534d96be879SSascha Hauer static int mxcmci_transfer_data(struct mxcmci_host *host) 535d96be879SSascha Hauer { 536d96be879SSascha Hauer struct mmc_data *data = host->req->data; 537d96be879SSascha Hauer struct scatterlist *sg; 538d96be879SSascha Hauer int stat, i; 539d96be879SSascha Hauer 540d96be879SSascha Hauer host->data = data; 541d96be879SSascha Hauer host->datasize = 0; 542d96be879SSascha Hauer 543d96be879SSascha Hauer if (data->flags & MMC_DATA_READ) { 544d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 545d96be879SSascha Hauer stat = mxcmci_pull(host, sg_virt(sg), sg->length); 546d96be879SSascha Hauer if (stat) 547d96be879SSascha Hauer return stat; 548d96be879SSascha Hauer host->datasize += sg->length; 549d96be879SSascha Hauer } 550d96be879SSascha Hauer } else { 551d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 552d96be879SSascha Hauer stat = mxcmci_push(host, sg_virt(sg), sg->length); 553d96be879SSascha Hauer if (stat) 554d96be879SSascha Hauer return stat; 555d96be879SSascha Hauer host->datasize += sg->length; 556d96be879SSascha Hauer } 557d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE); 558d96be879SSascha Hauer if (stat) 559d96be879SSascha Hauer return stat; 560d96be879SSascha Hauer } 561d96be879SSascha Hauer return 0; 562d96be879SSascha Hauer } 563d96be879SSascha Hauer 564d96be879SSascha Hauer static void mxcmci_datawork(struct work_struct *work) 565d96be879SSascha Hauer { 566d96be879SSascha Hauer struct mxcmci_host *host = container_of(work, struct mxcmci_host, 567d96be879SSascha Hauer datawork); 568d96be879SSascha Hauer int datastat = mxcmci_transfer_data(host); 5694a31f2efSDaniel Mack 5704a31f2efSDaniel Mack writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 5714a31f2efSDaniel Mack host->base + MMC_REG_STATUS); 572d96be879SSascha Hauer mxcmci_finish_data(host, datastat); 573d96be879SSascha Hauer 574d96be879SSascha Hauer if (host->req->stop) { 575d96be879SSascha Hauer if (mxcmci_start_cmd(host, host->req->stop, 0)) { 576d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 577d96be879SSascha Hauer return; 578d96be879SSascha Hauer } 579d96be879SSascha Hauer } else { 580d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 581d96be879SSascha Hauer } 582d96be879SSascha Hauer } 583d96be879SSascha Hauer 584d96be879SSascha Hauer static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat) 585d96be879SSascha Hauer { 586d96be879SSascha Hauer struct mmc_data *data = host->data; 587d96be879SSascha Hauer int data_error; 588d96be879SSascha Hauer 589d96be879SSascha Hauer if (!data) 590d96be879SSascha Hauer return; 591d96be879SSascha Hauer 592d96be879SSascha Hauer data_error = mxcmci_finish_data(host, stat); 593d96be879SSascha Hauer 594d96be879SSascha Hauer mxcmci_read_response(host, stat); 595d96be879SSascha Hauer host->cmd = NULL; 596d96be879SSascha Hauer 597d96be879SSascha Hauer if (host->req->stop) { 598d96be879SSascha Hauer if (mxcmci_start_cmd(host, host->req->stop, 0)) { 599d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 600d96be879SSascha Hauer return; 601d96be879SSascha Hauer } 602d96be879SSascha Hauer } else { 603d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 604d96be879SSascha Hauer } 605d96be879SSascha Hauer } 606d96be879SSascha Hauer 607d96be879SSascha Hauer static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat) 608d96be879SSascha Hauer { 609d96be879SSascha Hauer mxcmci_read_response(host, stat); 610d96be879SSascha Hauer host->cmd = NULL; 611d96be879SSascha Hauer 612d96be879SSascha Hauer if (!host->data && host->req) { 613d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 614d96be879SSascha Hauer return; 615d96be879SSascha Hauer } 616d96be879SSascha Hauer 617d96be879SSascha Hauer /* For the DMA case the DMA engine handles the data transfer 618fd589a8fSAnand Gadiyar * automatically. For non DMA we have to do it ourselves. 619d96be879SSascha Hauer * Don't do it in interrupt context though. 620d96be879SSascha Hauer */ 621d96be879SSascha Hauer if (!mxcmci_use_dma(host) && host->data) 622d96be879SSascha Hauer schedule_work(&host->datawork); 623d96be879SSascha Hauer 624d96be879SSascha Hauer } 625d96be879SSascha Hauer 626d96be879SSascha Hauer static irqreturn_t mxcmci_irq(int irq, void *devid) 627d96be879SSascha Hauer { 628d96be879SSascha Hauer struct mxcmci_host *host = devid; 629f441b993SDaniel Mack unsigned long flags; 630f441b993SDaniel Mack bool sdio_irq; 631d96be879SSascha Hauer u32 stat; 632d96be879SSascha Hauer 633d96be879SSascha Hauer stat = readl(host->base + MMC_REG_STATUS); 6344a31f2efSDaniel Mack writel(stat & ~(STATUS_SDIO_INT_ACTIVE | STATUS_DATA_TRANS_DONE | 6354a31f2efSDaniel Mack STATUS_WRITE_OP_DONE), host->base + MMC_REG_STATUS); 636d96be879SSascha Hauer 637d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat); 638d96be879SSascha Hauer 639f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 640f441b993SDaniel Mack sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio; 641f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 642f441b993SDaniel Mack 6434a31f2efSDaniel Mack if (mxcmci_use_dma(host) && 6444a31f2efSDaniel Mack (stat & (STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE))) 6454a31f2efSDaniel Mack writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 6464a31f2efSDaniel Mack host->base + MMC_REG_STATUS); 6474a31f2efSDaniel Mack 648f441b993SDaniel Mack if (sdio_irq) { 649f441b993SDaniel Mack writel(STATUS_SDIO_INT_ACTIVE, host->base + MMC_REG_STATUS); 650f441b993SDaniel Mack mmc_signal_sdio_irq(host->mmc); 651f441b993SDaniel Mack } 652f441b993SDaniel Mack 653d96be879SSascha Hauer if (stat & STATUS_END_CMD_RESP) 654d96be879SSascha Hauer mxcmci_cmd_done(host, stat); 655f441b993SDaniel Mack 656d96be879SSascha Hauer if (mxcmci_use_dma(host) && 657f6ad0a48SJavier Martin (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE))) { 658f6ad0a48SJavier Martin del_timer(&host->watchdog); 659d96be879SSascha Hauer mxcmci_data_done(host, stat); 660f6ad0a48SJavier Martin } 661f53fbde4SSascha Hauer 66216b3bf8cSEric Bénard if (host->default_irq_mask && 66316b3bf8cSEric Bénard (stat & (STATUS_CARD_INSERTION | STATUS_CARD_REMOVAL))) 66416b3bf8cSEric Bénard mmc_detect_change(host->mmc, msecs_to_jiffies(200)); 665f53fbde4SSascha Hauer 666d96be879SSascha Hauer return IRQ_HANDLED; 667d96be879SSascha Hauer } 668d96be879SSascha Hauer 669d96be879SSascha Hauer static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req) 670d96be879SSascha Hauer { 671d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 672d96be879SSascha Hauer unsigned int cmdat = host->cmdat; 673656217d2SMartin Fuzzey int error; 674d96be879SSascha Hauer 675d96be879SSascha Hauer WARN_ON(host->req != NULL); 676d96be879SSascha Hauer 677d96be879SSascha Hauer host->req = req; 678d96be879SSascha Hauer host->cmdat &= ~CMD_DAT_CONT_INIT; 679f53fbde4SSascha Hauer 680f53fbde4SSascha Hauer if (host->dma) 681d96be879SSascha Hauer host->do_dma = 1; 682f53fbde4SSascha Hauer 683d96be879SSascha Hauer if (req->data) { 684656217d2SMartin Fuzzey error = mxcmci_setup_data(host, req->data); 685656217d2SMartin Fuzzey if (error) { 686656217d2SMartin Fuzzey req->cmd->error = error; 687656217d2SMartin Fuzzey goto out; 688656217d2SMartin Fuzzey } 689656217d2SMartin Fuzzey 690d96be879SSascha Hauer 691d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_DATA_ENABLE; 692d96be879SSascha Hauer 693d96be879SSascha Hauer if (req->data->flags & MMC_DATA_WRITE) 694d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_WRITE; 695d96be879SSascha Hauer } 696d96be879SSascha Hauer 697656217d2SMartin Fuzzey error = mxcmci_start_cmd(host, req->cmd, cmdat); 698f53fbde4SSascha Hauer 699656217d2SMartin Fuzzey out: 700656217d2SMartin Fuzzey if (error) 701d96be879SSascha Hauer mxcmci_finish_request(host, req); 702d96be879SSascha Hauer } 703d96be879SSascha Hauer 704d96be879SSascha Hauer static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios) 705d96be879SSascha Hauer { 706d96be879SSascha Hauer unsigned int divider; 707d96be879SSascha Hauer int prescaler = 0; 708529aa29eSSascha Hauer unsigned int clk_in = clk_get_rate(host->clk_per); 709d96be879SSascha Hauer 710d96be879SSascha Hauer while (prescaler <= 0x800) { 711d96be879SSascha Hauer for (divider = 1; divider <= 0xF; divider++) { 712d96be879SSascha Hauer int x; 713d96be879SSascha Hauer 714d96be879SSascha Hauer x = (clk_in / (divider + 1)); 715d96be879SSascha Hauer 716d96be879SSascha Hauer if (prescaler) 717d96be879SSascha Hauer x /= (prescaler * 2); 718d96be879SSascha Hauer 719d96be879SSascha Hauer if (x <= clk_ios) 720d96be879SSascha Hauer break; 721d96be879SSascha Hauer } 722d96be879SSascha Hauer if (divider < 0x10) 723d96be879SSascha Hauer break; 724d96be879SSascha Hauer 725d96be879SSascha Hauer if (prescaler == 0) 726d96be879SSascha Hauer prescaler = 1; 727d96be879SSascha Hauer else 728d96be879SSascha Hauer prescaler <<= 1; 729d96be879SSascha Hauer } 730d96be879SSascha Hauer 731d96be879SSascha Hauer writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE); 732d96be879SSascha Hauer 733d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n", 734d96be879SSascha Hauer prescaler, divider, clk_in, clk_ios); 735d96be879SSascha Hauer } 736d96be879SSascha Hauer 737f53fbde4SSascha Hauer static int mxcmci_setup_dma(struct mmc_host *mmc) 738f53fbde4SSascha Hauer { 739f53fbde4SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 740f53fbde4SSascha Hauer struct dma_slave_config *config = &host->dma_slave_config; 741f53fbde4SSascha Hauer 742f53fbde4SSascha Hauer config->dst_addr = host->res->start + MMC_REG_BUFFER_ACCESS; 743f53fbde4SSascha Hauer config->src_addr = host->res->start + MMC_REG_BUFFER_ACCESS; 744f53fbde4SSascha Hauer config->dst_addr_width = 4; 745f53fbde4SSascha Hauer config->src_addr_width = 4; 746f53fbde4SSascha Hauer config->dst_maxburst = host->burstlen; 747f53fbde4SSascha Hauer config->src_maxburst = host->burstlen; 748258aea76SViresh Kumar config->device_fc = false; 749f53fbde4SSascha Hauer 750f53fbde4SSascha Hauer return dmaengine_slave_config(host->dma, config); 751f53fbde4SSascha Hauer } 752f53fbde4SSascha Hauer 753d96be879SSascha Hauer static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 754d96be879SSascha Hauer { 755d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 756f53fbde4SSascha Hauer int burstlen, ret; 757f53fbde4SSascha Hauer 758d96be879SSascha Hauer /* 7596584cb88SSascha Hauer * use burstlen of 64 (16 words) in 4 bit mode (--> reg value 0) 7606584cb88SSascha Hauer * use burstlen of 16 (4 words) in 1 bit mode (--> reg value 16) 761d96be879SSascha Hauer */ 762d96be879SSascha Hauer if (ios->bus_width == MMC_BUS_WIDTH_4) 763f53fbde4SSascha Hauer burstlen = 16; 7646584cb88SSascha Hauer else 7656584cb88SSascha Hauer burstlen = 4; 766d96be879SSascha Hauer 767f53fbde4SSascha Hauer if (mxcmci_use_dma(host) && burstlen != host->burstlen) { 768f53fbde4SSascha Hauer host->burstlen = burstlen; 769f53fbde4SSascha Hauer ret = mxcmci_setup_dma(mmc); 770f53fbde4SSascha Hauer if (ret) { 771f53fbde4SSascha Hauer dev_err(mmc_dev(host->mmc), 772f53fbde4SSascha Hauer "failed to config DMA channel. Falling back to PIO\n"); 773f53fbde4SSascha Hauer dma_release_channel(host->dma); 774f53fbde4SSascha Hauer host->do_dma = 0; 775e58f516fSSascha Hauer host->dma = NULL; 776f53fbde4SSascha Hauer } 777f53fbde4SSascha Hauer } 778f53fbde4SSascha Hauer 779d96be879SSascha Hauer if (ios->bus_width == MMC_BUS_WIDTH_4) 780d96be879SSascha Hauer host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4; 781d96be879SSascha Hauer else 782d96be879SSascha Hauer host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4; 783d96be879SSascha Hauer 784d96be879SSascha Hauer if (host->power_mode != ios->power_mode) { 785d078d242SAlberto Panizzo mxcmci_set_power(host, ios->power_mode, ios->vdd); 786d96be879SSascha Hauer host->power_mode = ios->power_mode; 78774b66954SAlberto Panizzo 788d96be879SSascha Hauer if (ios->power_mode == MMC_POWER_ON) 789d96be879SSascha Hauer host->cmdat |= CMD_DAT_CONT_INIT; 790d96be879SSascha Hauer } 791d96be879SSascha Hauer 792d96be879SSascha Hauer if (ios->clock) { 793d96be879SSascha Hauer mxcmci_set_clk_rate(host, ios->clock); 794d96be879SSascha Hauer writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); 795d96be879SSascha Hauer } else { 796d96be879SSascha Hauer writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK); 797d96be879SSascha Hauer } 798d96be879SSascha Hauer 799d96be879SSascha Hauer host->clock = ios->clock; 800d96be879SSascha Hauer } 801d96be879SSascha Hauer 802d96be879SSascha Hauer static irqreturn_t mxcmci_detect_irq(int irq, void *data) 803d96be879SSascha Hauer { 804d96be879SSascha Hauer struct mmc_host *mmc = data; 805d96be879SSascha Hauer 806d96be879SSascha Hauer dev_dbg(mmc_dev(mmc), "%s\n", __func__); 807d96be879SSascha Hauer 808d96be879SSascha Hauer mmc_detect_change(mmc, msecs_to_jiffies(250)); 809d96be879SSascha Hauer return IRQ_HANDLED; 810d96be879SSascha Hauer } 811d96be879SSascha Hauer 812d96be879SSascha Hauer static int mxcmci_get_ro(struct mmc_host *mmc) 813d96be879SSascha Hauer { 814d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 815d96be879SSascha Hauer 816d96be879SSascha Hauer if (host->pdata && host->pdata->get_ro) 817d96be879SSascha Hauer return !!host->pdata->get_ro(mmc_dev(mmc)); 818d96be879SSascha Hauer /* 819d96be879SSascha Hauer * Board doesn't support read only detection; let the mmc core 820d96be879SSascha Hauer * decide what to do. 821d96be879SSascha Hauer */ 822d96be879SSascha Hauer return -ENOSYS; 823d96be879SSascha Hauer } 824d96be879SSascha Hauer 825f441b993SDaniel Mack static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable) 826f441b993SDaniel Mack { 827f441b993SDaniel Mack struct mxcmci_host *host = mmc_priv(mmc); 828f441b993SDaniel Mack unsigned long flags; 829f441b993SDaniel Mack u32 int_cntr; 830f441b993SDaniel Mack 831f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 832f441b993SDaniel Mack host->use_sdio = enable; 833f441b993SDaniel Mack int_cntr = readl(host->base + MMC_REG_INT_CNTR); 834f441b993SDaniel Mack 835f441b993SDaniel Mack if (enable) 836f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 837f441b993SDaniel Mack else 838f441b993SDaniel Mack int_cntr &= ~INT_SDIO_IRQ_EN; 839f441b993SDaniel Mack 840f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 841f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 842f441b993SDaniel Mack } 843d96be879SSascha Hauer 8443fcb027dSDaniel Mack static void mxcmci_init_card(struct mmc_host *host, struct mmc_card *card) 8453fcb027dSDaniel Mack { 8463fcb027dSDaniel Mack /* 8473fcb027dSDaniel Mack * MX3 SoCs have a silicon bug which corrupts CRC calculation of 8483fcb027dSDaniel Mack * multi-block transfers when connected SDIO peripheral doesn't 8493fcb027dSDaniel Mack * drive the BUSY line as required by the specs. 8503fcb027dSDaniel Mack * One way to prevent this is to only allow 1-bit transfers. 8513fcb027dSDaniel Mack */ 8523fcb027dSDaniel Mack 8533fcb027dSDaniel Mack if (cpu_is_mx3() && card->type == MMC_TYPE_SDIO) 8543fcb027dSDaniel Mack host->caps &= ~MMC_CAP_4_BIT_DATA; 8553fcb027dSDaniel Mack else 8563fcb027dSDaniel Mack host->caps |= MMC_CAP_4_BIT_DATA; 8573fcb027dSDaniel Mack } 8583fcb027dSDaniel Mack 859f53fbde4SSascha Hauer static bool filter(struct dma_chan *chan, void *param) 860f53fbde4SSascha Hauer { 861f53fbde4SSascha Hauer struct mxcmci_host *host = param; 862f53fbde4SSascha Hauer 863f53fbde4SSascha Hauer if (!imx_dma_is_general_purpose(chan)) 864f53fbde4SSascha Hauer return false; 865f53fbde4SSascha Hauer 866f53fbde4SSascha Hauer chan->private = &host->dma_data; 867f53fbde4SSascha Hauer 868f53fbde4SSascha Hauer return true; 869f53fbde4SSascha Hauer } 870f53fbde4SSascha Hauer 871f6ad0a48SJavier Martin static void mxcmci_watchdog(unsigned long data) 872f6ad0a48SJavier Martin { 873f6ad0a48SJavier Martin struct mmc_host *mmc = (struct mmc_host *)data; 874f6ad0a48SJavier Martin struct mxcmci_host *host = mmc_priv(mmc); 875f6ad0a48SJavier Martin struct mmc_request *req = host->req; 876f6ad0a48SJavier Martin unsigned int stat = readl(host->base + MMC_REG_STATUS); 877f6ad0a48SJavier Martin 878f6ad0a48SJavier Martin if (host->dma_dir == DMA_FROM_DEVICE) { 879f6ad0a48SJavier Martin dmaengine_terminate_all(host->dma); 880f6ad0a48SJavier Martin dev_err(mmc_dev(host->mmc), 881f6ad0a48SJavier Martin "%s: read time out (status = 0x%08x)\n", 882f6ad0a48SJavier Martin __func__, stat); 883f6ad0a48SJavier Martin } else { 884f6ad0a48SJavier Martin dev_err(mmc_dev(host->mmc), 885f6ad0a48SJavier Martin "%s: write time out (status = 0x%08x)\n", 886f6ad0a48SJavier Martin __func__, stat); 887f6ad0a48SJavier Martin mxcmci_softreset(host); 888f6ad0a48SJavier Martin } 889f6ad0a48SJavier Martin 890f6ad0a48SJavier Martin /* Mark transfer as erroneus and inform the upper layers */ 891f6ad0a48SJavier Martin 892f6ad0a48SJavier Martin host->data->error = -ETIMEDOUT; 893f6ad0a48SJavier Martin host->req = NULL; 894f6ad0a48SJavier Martin host->cmd = NULL; 895f6ad0a48SJavier Martin host->data = NULL; 896f6ad0a48SJavier Martin mmc_request_done(host->mmc, req); 897f6ad0a48SJavier Martin } 898f6ad0a48SJavier Martin 899d96be879SSascha Hauer static const struct mmc_host_ops mxcmci_ops = { 900d96be879SSascha Hauer .request = mxcmci_request, 901d96be879SSascha Hauer .set_ios = mxcmci_set_ios, 902d96be879SSascha Hauer .get_ro = mxcmci_get_ro, 903f441b993SDaniel Mack .enable_sdio_irq = mxcmci_enable_sdio_irq, 9043fcb027dSDaniel Mack .init_card = mxcmci_init_card, 905d96be879SSascha Hauer }; 906d96be879SSascha Hauer 907d96be879SSascha Hauer static int mxcmci_probe(struct platform_device *pdev) 908d96be879SSascha Hauer { 909d96be879SSascha Hauer struct mmc_host *mmc; 910d96be879SSascha Hauer struct mxcmci_host *host = NULL; 911c0521bafSUwe Kleine-König struct resource *iores, *r; 912d96be879SSascha Hauer int ret = 0, irq; 913f53fbde4SSascha Hauer dma_cap_mask_t mask; 914d96be879SSascha Hauer 915a3c76eb9SGirish K S pr_info("i.MX SDHC driver\n"); 916d96be879SSascha Hauer 917c0521bafSUwe Kleine-König iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 918d96be879SSascha Hauer irq = platform_get_irq(pdev, 0); 919c0521bafSUwe Kleine-König if (!iores || irq < 0) 920d96be879SSascha Hauer return -EINVAL; 921d96be879SSascha Hauer 922c0521bafSUwe Kleine-König r = request_mem_region(iores->start, resource_size(iores), pdev->name); 923d96be879SSascha Hauer if (!r) 924d96be879SSascha Hauer return -EBUSY; 925d96be879SSascha Hauer 926d96be879SSascha Hauer mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev); 927d96be879SSascha Hauer if (!mmc) { 928d96be879SSascha Hauer ret = -ENOMEM; 929d96be879SSascha Hauer goto out_release_mem; 930d96be879SSascha Hauer } 931d96be879SSascha Hauer 932d96be879SSascha Hauer mmc->ops = &mxcmci_ops; 933f441b993SDaniel Mack mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; 934d96be879SSascha Hauer 935d96be879SSascha Hauer /* MMC core transfer sizes tunable parameters */ 936a36274e0SMartin K. Petersen mmc->max_segs = 64; 937d96be879SSascha Hauer mmc->max_blk_size = 2048; 938d96be879SSascha Hauer mmc->max_blk_count = 65535; 939d96be879SSascha Hauer mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; 940d759c374SVladimir Zapolskiy mmc->max_seg_size = mmc->max_req_size; 941d96be879SSascha Hauer 942d96be879SSascha Hauer host = mmc_priv(mmc); 943d96be879SSascha Hauer host->base = ioremap(r->start, resource_size(r)); 944d96be879SSascha Hauer if (!host->base) { 945d96be879SSascha Hauer ret = -ENOMEM; 946d96be879SSascha Hauer goto out_free; 947d96be879SSascha Hauer } 948d96be879SSascha Hauer 949d96be879SSascha Hauer host->mmc = mmc; 950d96be879SSascha Hauer host->pdata = pdev->dev.platform_data; 951f441b993SDaniel Mack spin_lock_init(&host->lock); 952d96be879SSascha Hauer 95374b66954SAlberto Panizzo mxcmci_init_ocr(host); 954d96be879SSascha Hauer 95516b3bf8cSEric Bénard if (host->pdata && host->pdata->dat3_card_detect) 95616b3bf8cSEric Bénard host->default_irq_mask = 95716b3bf8cSEric Bénard INT_CARD_INSERTION_EN | INT_CARD_REMOVAL_EN; 95816b3bf8cSEric Bénard else 95916b3bf8cSEric Bénard host->default_irq_mask = 0; 96016b3bf8cSEric Bénard 961d96be879SSascha Hauer host->res = r; 962d96be879SSascha Hauer host->irq = irq; 963d96be879SSascha Hauer 964529aa29eSSascha Hauer host->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 965529aa29eSSascha Hauer if (IS_ERR(host->clk_ipg)) { 966529aa29eSSascha Hauer ret = PTR_ERR(host->clk_ipg); 967d96be879SSascha Hauer goto out_iounmap; 968d96be879SSascha Hauer } 969529aa29eSSascha Hauer 970529aa29eSSascha Hauer host->clk_per = devm_clk_get(&pdev->dev, "per"); 971529aa29eSSascha Hauer if (IS_ERR(host->clk_per)) { 972529aa29eSSascha Hauer ret = PTR_ERR(host->clk_per); 973529aa29eSSascha Hauer goto out_iounmap; 974529aa29eSSascha Hauer } 975529aa29eSSascha Hauer 976529aa29eSSascha Hauer clk_prepare_enable(host->clk_per); 977529aa29eSSascha Hauer clk_prepare_enable(host->clk_ipg); 978d96be879SSascha Hauer 979d96be879SSascha Hauer mxcmci_softreset(host); 980d96be879SSascha Hauer 981d96be879SSascha Hauer host->rev_no = readw(host->base + MMC_REG_REV_NO); 982d96be879SSascha Hauer if (host->rev_no != 0x400) { 983d96be879SSascha Hauer ret = -ENODEV; 984d96be879SSascha Hauer dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n", 985d96be879SSascha Hauer host->rev_no); 986d96be879SSascha Hauer goto out_clk_put; 987d96be879SSascha Hauer } 988d96be879SSascha Hauer 989529aa29eSSascha Hauer mmc->f_min = clk_get_rate(host->clk_per) >> 16; 990529aa29eSSascha Hauer mmc->f_max = clk_get_rate(host->clk_per) >> 1; 991d96be879SSascha Hauer 992d96be879SSascha Hauer /* recommended in data sheet */ 993d96be879SSascha Hauer writew(0x2db4, host->base + MMC_REG_READ_TO); 994d96be879SSascha Hauer 99516b3bf8cSEric Bénard writel(host->default_irq_mask, host->base + MMC_REG_INT_CNTR); 996d96be879SSascha Hauer 997d96be879SSascha Hauer r = platform_get_resource(pdev, IORESOURCE_DMA, 0); 998f53fbde4SSascha Hauer if (r) { 999f53fbde4SSascha Hauer host->dmareq = r->start; 1000f53fbde4SSascha Hauer host->dma_data.peripheral_type = IMX_DMATYPE_SDHC; 1001f53fbde4SSascha Hauer host->dma_data.priority = DMA_PRIO_LOW; 1002f53fbde4SSascha Hauer host->dma_data.dma_request = host->dmareq; 1003f53fbde4SSascha Hauer dma_cap_zero(mask); 1004f53fbde4SSascha Hauer dma_cap_set(DMA_SLAVE, mask); 1005f53fbde4SSascha Hauer host->dma = dma_request_channel(mask, filter, host); 1006f53fbde4SSascha Hauer if (host->dma) 1007f53fbde4SSascha Hauer mmc->max_seg_size = dma_get_max_seg_size( 1008f53fbde4SSascha Hauer host->dma->device->dev); 1009d96be879SSascha Hauer } 1010d96be879SSascha Hauer 1011f53fbde4SSascha Hauer if (!host->dma) 1012f53fbde4SSascha Hauer dev_info(mmc_dev(host->mmc), "dma not available. Using PIO\n"); 1013f53fbde4SSascha Hauer 1014d96be879SSascha Hauer INIT_WORK(&host->datawork, mxcmci_datawork); 1015d96be879SSascha Hauer 1016d96be879SSascha Hauer ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host); 1017d96be879SSascha Hauer if (ret) 1018d96be879SSascha Hauer goto out_free_dma; 1019d96be879SSascha Hauer 1020d96be879SSascha Hauer platform_set_drvdata(pdev, mmc); 1021d96be879SSascha Hauer 1022d96be879SSascha Hauer if (host->pdata && host->pdata->init) { 1023d96be879SSascha Hauer ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq, 1024d96be879SSascha Hauer host->mmc); 1025d96be879SSascha Hauer if (ret) 1026d96be879SSascha Hauer goto out_free_irq; 1027d96be879SSascha Hauer } 1028d96be879SSascha Hauer 1029d96be879SSascha Hauer mmc_add_host(mmc); 1030d96be879SSascha Hauer 1031f6ad0a48SJavier Martin init_timer(&host->watchdog); 1032f6ad0a48SJavier Martin host->watchdog.function = &mxcmci_watchdog; 1033f6ad0a48SJavier Martin host->watchdog.data = (unsigned long)mmc; 1034f6ad0a48SJavier Martin 1035d96be879SSascha Hauer return 0; 1036d96be879SSascha Hauer 1037d96be879SSascha Hauer out_free_irq: 1038d96be879SSascha Hauer free_irq(host->irq, host); 1039d96be879SSascha Hauer out_free_dma: 1040f53fbde4SSascha Hauer if (host->dma) 1041f53fbde4SSascha Hauer dma_release_channel(host->dma); 1042d96be879SSascha Hauer out_clk_put: 1043529aa29eSSascha Hauer clk_disable_unprepare(host->clk_per); 1044529aa29eSSascha Hauer clk_disable_unprepare(host->clk_ipg); 1045d96be879SSascha Hauer out_iounmap: 1046d96be879SSascha Hauer iounmap(host->base); 1047d96be879SSascha Hauer out_free: 1048d96be879SSascha Hauer mmc_free_host(mmc); 1049d96be879SSascha Hauer out_release_mem: 1050c0521bafSUwe Kleine-König release_mem_region(iores->start, resource_size(iores)); 1051d96be879SSascha Hauer return ret; 1052d96be879SSascha Hauer } 1053d96be879SSascha Hauer 1054d96be879SSascha Hauer static int mxcmci_remove(struct platform_device *pdev) 1055d96be879SSascha Hauer { 1056d96be879SSascha Hauer struct mmc_host *mmc = platform_get_drvdata(pdev); 1057d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 1058d96be879SSascha Hauer 1059d96be879SSascha Hauer platform_set_drvdata(pdev, NULL); 1060d96be879SSascha Hauer 1061d96be879SSascha Hauer mmc_remove_host(mmc); 1062d96be879SSascha Hauer 106374b66954SAlberto Panizzo if (host->vcc) 106474b66954SAlberto Panizzo regulator_put(host->vcc); 106574b66954SAlberto Panizzo 1066d96be879SSascha Hauer if (host->pdata && host->pdata->exit) 1067d96be879SSascha Hauer host->pdata->exit(&pdev->dev, mmc); 1068d96be879SSascha Hauer 1069d96be879SSascha Hauer free_irq(host->irq, host); 1070d96be879SSascha Hauer iounmap(host->base); 1071f53fbde4SSascha Hauer 1072f53fbde4SSascha Hauer if (host->dma) 1073f53fbde4SSascha Hauer dma_release_channel(host->dma); 1074f53fbde4SSascha Hauer 1075529aa29eSSascha Hauer clk_disable_unprepare(host->clk_per); 1076529aa29eSSascha Hauer clk_disable_unprepare(host->clk_ipg); 1077d96be879SSascha Hauer 1078d96be879SSascha Hauer release_mem_region(host->res->start, resource_size(host->res)); 1079d96be879SSascha Hauer 1080d96be879SSascha Hauer mmc_free_host(mmc); 1081d96be879SSascha Hauer 1082d96be879SSascha Hauer return 0; 1083d96be879SSascha Hauer } 1084d96be879SSascha Hauer 1085d96be879SSascha Hauer #ifdef CONFIG_PM 1086a7d403cfSEric Bénard static int mxcmci_suspend(struct device *dev) 1087d96be879SSascha Hauer { 1088a7d403cfSEric Bénard struct mmc_host *mmc = dev_get_drvdata(dev); 1089a7d403cfSEric Bénard struct mxcmci_host *host = mmc_priv(mmc); 1090d96be879SSascha Hauer int ret = 0; 1091d96be879SSascha Hauer 1092d96be879SSascha Hauer if (mmc) 10931a13f8faSMatt Fleming ret = mmc_suspend_host(mmc); 1094529aa29eSSascha Hauer clk_disable_unprepare(host->clk_per); 1095529aa29eSSascha Hauer clk_disable_unprepare(host->clk_ipg); 1096d96be879SSascha Hauer 1097d96be879SSascha Hauer return ret; 1098d96be879SSascha Hauer } 1099d96be879SSascha Hauer 1100a7d403cfSEric Bénard static int mxcmci_resume(struct device *dev) 1101d96be879SSascha Hauer { 1102a7d403cfSEric Bénard struct mmc_host *mmc = dev_get_drvdata(dev); 1103a7d403cfSEric Bénard struct mxcmci_host *host = mmc_priv(mmc); 1104d96be879SSascha Hauer int ret = 0; 1105d96be879SSascha Hauer 1106529aa29eSSascha Hauer clk_prepare_enable(host->clk_per); 1107529aa29eSSascha Hauer clk_prepare_enable(host->clk_ipg); 1108a7d403cfSEric Bénard if (mmc) 1109d96be879SSascha Hauer ret = mmc_resume_host(mmc); 1110d96be879SSascha Hauer 1111d96be879SSascha Hauer return ret; 1112d96be879SSascha Hauer } 1113a7d403cfSEric Bénard 1114a7d403cfSEric Bénard static const struct dev_pm_ops mxcmci_pm_ops = { 1115a7d403cfSEric Bénard .suspend = mxcmci_suspend, 1116a7d403cfSEric Bénard .resume = mxcmci_resume, 1117a7d403cfSEric Bénard }; 1118a7d403cfSEric Bénard #endif 1119d96be879SSascha Hauer 1120d96be879SSascha Hauer static struct platform_driver mxcmci_driver = { 1121d96be879SSascha Hauer .probe = mxcmci_probe, 1122d96be879SSascha Hauer .remove = mxcmci_remove, 1123d96be879SSascha Hauer .driver = { 1124d96be879SSascha Hauer .name = DRIVER_NAME, 1125d96be879SSascha Hauer .owner = THIS_MODULE, 1126a7d403cfSEric Bénard #ifdef CONFIG_PM 1127a7d403cfSEric Bénard .pm = &mxcmci_pm_ops, 1128a7d403cfSEric Bénard #endif 1129d96be879SSascha Hauer } 1130d96be879SSascha Hauer }; 1131d96be879SSascha Hauer 1132d1f81a64SAxel Lin module_platform_driver(mxcmci_driver); 1133d96be879SSascha Hauer 1134d96be879SSascha Hauer MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver"); 1135d96be879SSascha Hauer MODULE_AUTHOR("Sascha Hauer, Pengutronix"); 1136d96be879SSascha Hauer MODULE_LICENSE("GPL"); 11376eb30adfSFabio Estevam MODULE_ALIAS("platform:mxc-mmc"); 1138