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" 47d96be879SSascha Hauer 48d96be879SSascha Hauer #define MMC_REG_STR_STP_CLK 0x00 49d96be879SSascha Hauer #define MMC_REG_STATUS 0x04 50d96be879SSascha Hauer #define MMC_REG_CLK_RATE 0x08 51d96be879SSascha Hauer #define MMC_REG_CMD_DAT_CONT 0x0C 52d96be879SSascha Hauer #define MMC_REG_RES_TO 0x10 53d96be879SSascha Hauer #define MMC_REG_READ_TO 0x14 54d96be879SSascha Hauer #define MMC_REG_BLK_LEN 0x18 55d96be879SSascha Hauer #define MMC_REG_NOB 0x1C 56d96be879SSascha Hauer #define MMC_REG_REV_NO 0x20 57d96be879SSascha Hauer #define MMC_REG_INT_CNTR 0x24 58d96be879SSascha Hauer #define MMC_REG_CMD 0x28 59d96be879SSascha Hauer #define MMC_REG_ARG 0x2C 60d96be879SSascha Hauer #define MMC_REG_RES_FIFO 0x34 61d96be879SSascha Hauer #define MMC_REG_BUFFER_ACCESS 0x38 62d96be879SSascha Hauer 63d96be879SSascha Hauer #define STR_STP_CLK_RESET (1 << 3) 64d96be879SSascha Hauer #define STR_STP_CLK_START_CLK (1 << 1) 65d96be879SSascha Hauer #define STR_STP_CLK_STOP_CLK (1 << 0) 66d96be879SSascha Hauer 67d96be879SSascha Hauer #define STATUS_CARD_INSERTION (1 << 31) 68d96be879SSascha Hauer #define STATUS_CARD_REMOVAL (1 << 30) 69d96be879SSascha Hauer #define STATUS_YBUF_EMPTY (1 << 29) 70d96be879SSascha Hauer #define STATUS_XBUF_EMPTY (1 << 28) 71d96be879SSascha Hauer #define STATUS_YBUF_FULL (1 << 27) 72d96be879SSascha Hauer #define STATUS_XBUF_FULL (1 << 26) 73d96be879SSascha Hauer #define STATUS_BUF_UND_RUN (1 << 25) 74d96be879SSascha Hauer #define STATUS_BUF_OVFL (1 << 24) 75d96be879SSascha Hauer #define STATUS_SDIO_INT_ACTIVE (1 << 14) 76d96be879SSascha Hauer #define STATUS_END_CMD_RESP (1 << 13) 77d96be879SSascha Hauer #define STATUS_WRITE_OP_DONE (1 << 12) 78d96be879SSascha Hauer #define STATUS_DATA_TRANS_DONE (1 << 11) 79d96be879SSascha Hauer #define STATUS_READ_OP_DONE (1 << 11) 80d96be879SSascha Hauer #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10) 81d96be879SSascha Hauer #define STATUS_CARD_BUS_CLK_RUN (1 << 8) 82d96be879SSascha Hauer #define STATUS_BUF_READ_RDY (1 << 7) 83d96be879SSascha Hauer #define STATUS_BUF_WRITE_RDY (1 << 6) 84d96be879SSascha Hauer #define STATUS_RESP_CRC_ERR (1 << 5) 85d96be879SSascha Hauer #define STATUS_CRC_READ_ERR (1 << 3) 86d96be879SSascha Hauer #define STATUS_CRC_WRITE_ERR (1 << 2) 87d96be879SSascha Hauer #define STATUS_TIME_OUT_RESP (1 << 1) 88d96be879SSascha Hauer #define STATUS_TIME_OUT_READ (1 << 0) 89d96be879SSascha Hauer #define STATUS_ERR_MASK 0x2f 90d96be879SSascha Hauer 91d96be879SSascha Hauer #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12) 92d96be879SSascha Hauer #define CMD_DAT_CONT_STOP_READWAIT (1 << 11) 93d96be879SSascha Hauer #define CMD_DAT_CONT_START_READWAIT (1 << 10) 94d96be879SSascha Hauer #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8) 95d96be879SSascha Hauer #define CMD_DAT_CONT_INIT (1 << 7) 96d96be879SSascha Hauer #define CMD_DAT_CONT_WRITE (1 << 4) 97d96be879SSascha Hauer #define CMD_DAT_CONT_DATA_ENABLE (1 << 3) 98d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0) 99d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0) 100d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0) 101d96be879SSascha Hauer 102d96be879SSascha Hauer #define INT_SDIO_INT_WKP_EN (1 << 18) 103d96be879SSascha Hauer #define INT_CARD_INSERTION_WKP_EN (1 << 17) 104d96be879SSascha Hauer #define INT_CARD_REMOVAL_WKP_EN (1 << 16) 105d96be879SSascha Hauer #define INT_CARD_INSERTION_EN (1 << 15) 106d96be879SSascha Hauer #define INT_CARD_REMOVAL_EN (1 << 14) 107d96be879SSascha Hauer #define INT_SDIO_IRQ_EN (1 << 13) 108d96be879SSascha Hauer #define INT_DAT0_EN (1 << 12) 109d96be879SSascha Hauer #define INT_BUF_READ_EN (1 << 4) 110d96be879SSascha Hauer #define INT_BUF_WRITE_EN (1 << 3) 111d96be879SSascha Hauer #define INT_END_CMD_RES_EN (1 << 2) 112d96be879SSascha Hauer #define INT_WRITE_OP_DONE_EN (1 << 1) 113d96be879SSascha Hauer #define INT_READ_OP_EN (1 << 0) 114d96be879SSascha Hauer 115d96be879SSascha Hauer struct mxcmci_host { 116d96be879SSascha Hauer struct mmc_host *mmc; 117d96be879SSascha Hauer struct resource *res; 118d96be879SSascha Hauer void __iomem *base; 119d96be879SSascha Hauer int irq; 120d96be879SSascha Hauer int detect_irq; 121f53fbde4SSascha Hauer struct dma_chan *dma; 122f53fbde4SSascha Hauer struct dma_async_tx_descriptor *desc; 123d96be879SSascha Hauer int do_dma; 12416b3bf8cSEric Bénard int default_irq_mask; 125f441b993SDaniel Mack int use_sdio; 126d96be879SSascha Hauer unsigned int power_mode; 127d96be879SSascha Hauer struct imxmmc_platform_data *pdata; 128d96be879SSascha Hauer 129d96be879SSascha Hauer struct mmc_request *req; 130d96be879SSascha Hauer struct mmc_command *cmd; 131d96be879SSascha Hauer struct mmc_data *data; 132d96be879SSascha Hauer 133d96be879SSascha Hauer unsigned int datasize; 134d96be879SSascha Hauer unsigned int dma_dir; 135d96be879SSascha Hauer 136d96be879SSascha Hauer u16 rev_no; 137d96be879SSascha Hauer unsigned int cmdat; 138d96be879SSascha Hauer 139529aa29eSSascha Hauer struct clk *clk_ipg; 140529aa29eSSascha Hauer struct clk *clk_per; 141d96be879SSascha Hauer 142d96be879SSascha Hauer int clock; 143d96be879SSascha Hauer 144d96be879SSascha Hauer struct work_struct datawork; 145f441b993SDaniel Mack spinlock_t lock; 14674b66954SAlberto Panizzo 14774b66954SAlberto Panizzo struct regulator *vcc; 148f53fbde4SSascha Hauer 149f53fbde4SSascha Hauer int burstlen; 150f53fbde4SSascha Hauer int dmareq; 151f53fbde4SSascha Hauer struct dma_slave_config dma_slave_config; 152f53fbde4SSascha Hauer struct imx_dma_data dma_data; 153d96be879SSascha Hauer }; 154d96be879SSascha Hauer 15518489fa2SMartin Fuzzey static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios); 15618489fa2SMartin Fuzzey 15774b66954SAlberto Panizzo static inline void mxcmci_init_ocr(struct mxcmci_host *host) 15874b66954SAlberto Panizzo { 15974b66954SAlberto Panizzo host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc"); 16074b66954SAlberto Panizzo 16174b66954SAlberto Panizzo if (IS_ERR(host->vcc)) { 16274b66954SAlberto Panizzo host->vcc = NULL; 16374b66954SAlberto Panizzo } else { 16474b66954SAlberto Panizzo host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc); 16574b66954SAlberto Panizzo if (host->pdata && host->pdata->ocr_avail) 16674b66954SAlberto Panizzo dev_warn(mmc_dev(host->mmc), 16774b66954SAlberto Panizzo "pdata->ocr_avail will not be used\n"); 16874b66954SAlberto Panizzo } 169d078d242SAlberto Panizzo 17074b66954SAlberto Panizzo if (host->vcc == NULL) { 17174b66954SAlberto Panizzo /* fall-back to platform data */ 17274b66954SAlberto Panizzo if (host->pdata && host->pdata->ocr_avail) 17374b66954SAlberto Panizzo host->mmc->ocr_avail = host->pdata->ocr_avail; 17474b66954SAlberto Panizzo else 17574b66954SAlberto Panizzo host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 17674b66954SAlberto Panizzo } 17774b66954SAlberto Panizzo } 17874b66954SAlberto Panizzo 179d078d242SAlberto Panizzo static inline void mxcmci_set_power(struct mxcmci_host *host, 180d078d242SAlberto Panizzo unsigned char power_mode, 181d078d242SAlberto Panizzo unsigned int vdd) 18274b66954SAlberto Panizzo { 183d078d242SAlberto Panizzo if (host->vcc) { 184d078d242SAlberto Panizzo if (power_mode == MMC_POWER_UP) 185d078d242SAlberto Panizzo mmc_regulator_set_ocr(host->mmc, host->vcc, vdd); 186d078d242SAlberto Panizzo else if (power_mode == MMC_POWER_OFF) 187d078d242SAlberto Panizzo mmc_regulator_set_ocr(host->mmc, host->vcc, 0); 188d078d242SAlberto Panizzo } 189d078d242SAlberto Panizzo 19074b66954SAlberto Panizzo if (host->pdata && host->pdata->setpower) 19174b66954SAlberto Panizzo host->pdata->setpower(mmc_dev(host->mmc), vdd); 19274b66954SAlberto Panizzo } 19374b66954SAlberto Panizzo 194d96be879SSascha Hauer static inline int mxcmci_use_dma(struct mxcmci_host *host) 195d96be879SSascha Hauer { 196d96be879SSascha Hauer return host->do_dma; 197d96be879SSascha Hauer } 198d96be879SSascha Hauer 199d96be879SSascha Hauer static void mxcmci_softreset(struct mxcmci_host *host) 200d96be879SSascha Hauer { 201d96be879SSascha Hauer int i; 202d96be879SSascha Hauer 2034725f6f1SDaniel Mack dev_dbg(mmc_dev(host->mmc), "mxcmci_softreset\n"); 2044725f6f1SDaniel Mack 205d96be879SSascha Hauer /* reset sequence */ 206d96be879SSascha Hauer writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK); 207d96be879SSascha Hauer writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK, 208d96be879SSascha Hauer host->base + MMC_REG_STR_STP_CLK); 209d96be879SSascha Hauer 210d96be879SSascha Hauer for (i = 0; i < 8; i++) 211d96be879SSascha Hauer writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); 212d96be879SSascha Hauer 213d96be879SSascha Hauer writew(0xff, host->base + MMC_REG_RES_TO); 214d96be879SSascha Hauer } 215f53fbde4SSascha Hauer static int mxcmci_setup_dma(struct mmc_host *mmc); 216d96be879SSascha Hauer 217656217d2SMartin Fuzzey static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data) 218d96be879SSascha Hauer { 219d96be879SSascha Hauer unsigned int nob = data->blocks; 220d96be879SSascha Hauer unsigned int blksz = data->blksz; 221d96be879SSascha Hauer unsigned int datasize = nob * blksz; 222d96be879SSascha Hauer struct scatterlist *sg; 22305f5799cSVinod Koul enum dma_transfer_direction slave_dirn; 224f53fbde4SSascha Hauer int i, nents; 225f53fbde4SSascha Hauer 226d96be879SSascha Hauer if (data->flags & MMC_DATA_STREAM) 227d96be879SSascha Hauer nob = 0xffff; 228d96be879SSascha Hauer 229d96be879SSascha Hauer host->data = data; 230d96be879SSascha Hauer data->bytes_xfered = 0; 231d96be879SSascha Hauer 232d96be879SSascha Hauer writew(nob, host->base + MMC_REG_NOB); 233d96be879SSascha Hauer writew(blksz, host->base + MMC_REG_BLK_LEN); 234d96be879SSascha Hauer host->datasize = datasize; 235d96be879SSascha Hauer 236f53fbde4SSascha Hauer if (!mxcmci_use_dma(host)) 237f53fbde4SSascha Hauer return 0; 238f53fbde4SSascha Hauer 239d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 240d96be879SSascha Hauer if (sg->offset & 3 || sg->length & 3) { 241d96be879SSascha Hauer host->do_dma = 0; 242656217d2SMartin Fuzzey return 0; 243d96be879SSascha Hauer } 244d96be879SSascha Hauer } 245d96be879SSascha Hauer 24605f5799cSVinod Koul if (data->flags & MMC_DATA_READ) { 247d96be879SSascha Hauer host->dma_dir = DMA_FROM_DEVICE; 24805f5799cSVinod Koul slave_dirn = DMA_DEV_TO_MEM; 24905f5799cSVinod Koul } else { 250d96be879SSascha Hauer host->dma_dir = DMA_TO_DEVICE; 25105f5799cSVinod Koul slave_dirn = DMA_MEM_TO_DEV; 25205f5799cSVinod Koul } 253f53fbde4SSascha Hauer 254f53fbde4SSascha Hauer nents = dma_map_sg(host->dma->device->dev, data->sg, 255d96be879SSascha Hauer data->sg_len, host->dma_dir); 256f53fbde4SSascha Hauer if (nents != data->sg_len) 257f53fbde4SSascha Hauer return -EINVAL; 258d96be879SSascha Hauer 25916052827SAlexandre Bounine host->desc = dmaengine_prep_slave_sg(host->dma, 26005f5799cSVinod Koul data->sg, data->sg_len, slave_dirn, 261f53fbde4SSascha Hauer DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 262d96be879SSascha Hauer 263f53fbde4SSascha Hauer if (!host->desc) { 264f53fbde4SSascha Hauer dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len, 265f53fbde4SSascha Hauer host->dma_dir); 266f53fbde4SSascha Hauer host->do_dma = 0; 267f53fbde4SSascha Hauer return 0; /* Fall back to PIO */ 268656217d2SMartin Fuzzey } 269d96be879SSascha Hauer wmb(); 270d96be879SSascha Hauer 271f53fbde4SSascha Hauer dmaengine_submit(host->desc); 272439aa0efSSascha Hauer dma_async_issue_pending(host->dma); 273f53fbde4SSascha Hauer 274656217d2SMartin Fuzzey return 0; 275d96be879SSascha Hauer } 276d96be879SSascha Hauer 277d96be879SSascha Hauer static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd, 278d96be879SSascha Hauer unsigned int cmdat) 279d96be879SSascha Hauer { 28016b3bf8cSEric Bénard u32 int_cntr = host->default_irq_mask; 281f441b993SDaniel Mack unsigned long flags; 282f441b993SDaniel Mack 283d96be879SSascha Hauer WARN_ON(host->cmd != NULL); 284d96be879SSascha Hauer host->cmd = cmd; 285d96be879SSascha Hauer 286d96be879SSascha Hauer switch (mmc_resp_type(cmd)) { 287d96be879SSascha Hauer case MMC_RSP_R1: /* short CRC, OPCODE */ 288d96be879SSascha Hauer case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */ 289d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC; 290d96be879SSascha Hauer break; 291d96be879SSascha Hauer case MMC_RSP_R2: /* long 136 bit + CRC */ 292d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_136BIT; 293d96be879SSascha Hauer break; 294d96be879SSascha Hauer case MMC_RSP_R3: /* short */ 295d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_48BIT; 296d96be879SSascha Hauer break; 297d96be879SSascha Hauer case MMC_RSP_NONE: 298d96be879SSascha Hauer break; 299d96be879SSascha Hauer default: 300d96be879SSascha Hauer dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n", 301d96be879SSascha Hauer mmc_resp_type(cmd)); 302d96be879SSascha Hauer cmd->error = -EINVAL; 303d96be879SSascha Hauer return -EINVAL; 304d96be879SSascha Hauer } 305d96be879SSascha Hauer 306f441b993SDaniel Mack int_cntr = INT_END_CMD_RES_EN; 307f441b993SDaniel Mack 308d96be879SSascha Hauer if (mxcmci_use_dma(host)) 309f441b993SDaniel Mack int_cntr |= INT_READ_OP_EN | INT_WRITE_OP_DONE_EN; 310f441b993SDaniel Mack 311f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 312f441b993SDaniel Mack if (host->use_sdio) 313f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 314f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 315f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 316d96be879SSascha Hauer 317d96be879SSascha Hauer writew(cmd->opcode, host->base + MMC_REG_CMD); 318d96be879SSascha Hauer writel(cmd->arg, host->base + MMC_REG_ARG); 319d96be879SSascha Hauer writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT); 320d96be879SSascha Hauer 321d96be879SSascha Hauer return 0; 322d96be879SSascha Hauer } 323d96be879SSascha Hauer 324d96be879SSascha Hauer static void mxcmci_finish_request(struct mxcmci_host *host, 325d96be879SSascha Hauer struct mmc_request *req) 326d96be879SSascha Hauer { 32716b3bf8cSEric Bénard u32 int_cntr = host->default_irq_mask; 328f441b993SDaniel Mack unsigned long flags; 329f441b993SDaniel Mack 330f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 331f441b993SDaniel Mack if (host->use_sdio) 332f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 333f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 334f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 335d96be879SSascha Hauer 336d96be879SSascha Hauer host->req = NULL; 337d96be879SSascha Hauer host->cmd = NULL; 338d96be879SSascha Hauer host->data = NULL; 339d96be879SSascha Hauer 340d96be879SSascha Hauer mmc_request_done(host->mmc, req); 341d96be879SSascha Hauer } 342d96be879SSascha Hauer 343d96be879SSascha Hauer static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat) 344d96be879SSascha Hauer { 345d96be879SSascha Hauer struct mmc_data *data = host->data; 346d96be879SSascha Hauer int data_error; 347d96be879SSascha Hauer 348d96be879SSascha Hauer if (mxcmci_use_dma(host)) { 349f53fbde4SSascha Hauer dmaengine_terminate_all(host->dma); 350f53fbde4SSascha Hauer dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len, 351d96be879SSascha Hauer host->dma_dir); 352d96be879SSascha Hauer } 353d96be879SSascha Hauer 354d96be879SSascha Hauer if (stat & STATUS_ERR_MASK) { 355d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n", 356d96be879SSascha Hauer stat); 357d96be879SSascha Hauer if (stat & STATUS_CRC_READ_ERR) { 3584725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), "%s: -EILSEQ\n", __func__); 359d96be879SSascha Hauer data->error = -EILSEQ; 360d96be879SSascha Hauer } else if (stat & STATUS_CRC_WRITE_ERR) { 361d96be879SSascha Hauer u32 err_code = (stat >> 9) & 0x3; 3624725f6f1SDaniel Mack if (err_code == 2) { /* No CRC response */ 3634725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3644725f6f1SDaniel Mack "%s: No CRC -ETIMEDOUT\n", __func__); 365d96be879SSascha Hauer data->error = -ETIMEDOUT; 366d96be879SSascha Hauer } else { 3674725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3684725f6f1SDaniel Mack "%s: -EILSEQ\n", __func__); 3694725f6f1SDaniel Mack data->error = -EILSEQ; 3704725f6f1SDaniel Mack } 3714725f6f1SDaniel Mack } else if (stat & STATUS_TIME_OUT_READ) { 3724725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3734725f6f1SDaniel Mack "%s: read -ETIMEDOUT\n", __func__); 3744725f6f1SDaniel Mack data->error = -ETIMEDOUT; 3754725f6f1SDaniel Mack } else { 3764725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), "%s: -EIO\n", __func__); 377d96be879SSascha Hauer data->error = -EIO; 378d96be879SSascha Hauer } 379d96be879SSascha Hauer } else { 380d96be879SSascha Hauer data->bytes_xfered = host->datasize; 381d96be879SSascha Hauer } 382d96be879SSascha Hauer 383d96be879SSascha Hauer data_error = data->error; 384d96be879SSascha Hauer 385d96be879SSascha Hauer host->data = NULL; 386d96be879SSascha Hauer 387d96be879SSascha Hauer return data_error; 388d96be879SSascha Hauer } 389d96be879SSascha Hauer 390d96be879SSascha Hauer static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat) 391d96be879SSascha Hauer { 392d96be879SSascha Hauer struct mmc_command *cmd = host->cmd; 393d96be879SSascha Hauer int i; 394d96be879SSascha Hauer u32 a, b, c; 395d96be879SSascha Hauer 396d96be879SSascha Hauer if (!cmd) 397d96be879SSascha Hauer return; 398d96be879SSascha Hauer 399d96be879SSascha Hauer if (stat & STATUS_TIME_OUT_RESP) { 400d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n"); 401d96be879SSascha Hauer cmd->error = -ETIMEDOUT; 402d96be879SSascha Hauer } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) { 403d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "cmd crc error\n"); 404d96be879SSascha Hauer cmd->error = -EILSEQ; 405d96be879SSascha Hauer } 406d96be879SSascha Hauer 407d96be879SSascha Hauer if (cmd->flags & MMC_RSP_PRESENT) { 408d96be879SSascha Hauer if (cmd->flags & MMC_RSP_136) { 409d96be879SSascha Hauer for (i = 0; i < 4; i++) { 410d96be879SSascha Hauer a = readw(host->base + MMC_REG_RES_FIFO); 411d96be879SSascha Hauer b = readw(host->base + MMC_REG_RES_FIFO); 412d96be879SSascha Hauer cmd->resp[i] = a << 16 | b; 413d96be879SSascha Hauer } 414d96be879SSascha Hauer } else { 415d96be879SSascha Hauer a = readw(host->base + MMC_REG_RES_FIFO); 416d96be879SSascha Hauer b = readw(host->base + MMC_REG_RES_FIFO); 417d96be879SSascha Hauer c = readw(host->base + MMC_REG_RES_FIFO); 418d96be879SSascha Hauer cmd->resp[0] = a << 24 | b << 8 | c >> 8; 419d96be879SSascha Hauer } 420d96be879SSascha Hauer } 421d96be879SSascha Hauer } 422d96be879SSascha Hauer 423d96be879SSascha Hauer static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask) 424d96be879SSascha Hauer { 425d96be879SSascha Hauer u32 stat; 426d96be879SSascha Hauer unsigned long timeout = jiffies + HZ; 427d96be879SSascha Hauer 428d96be879SSascha Hauer do { 429d96be879SSascha Hauer stat = readl(host->base + MMC_REG_STATUS); 430d96be879SSascha Hauer if (stat & STATUS_ERR_MASK) 431d96be879SSascha Hauer return stat; 43218489fa2SMartin Fuzzey if (time_after(jiffies, timeout)) { 43318489fa2SMartin Fuzzey mxcmci_softreset(host); 43418489fa2SMartin Fuzzey mxcmci_set_clk_rate(host, host->clock); 435d96be879SSascha Hauer return STATUS_TIME_OUT_READ; 43618489fa2SMartin Fuzzey } 437d96be879SSascha Hauer if (stat & mask) 438d96be879SSascha Hauer return 0; 439d96be879SSascha Hauer cpu_relax(); 440d96be879SSascha Hauer } while (1); 441d96be879SSascha Hauer } 442d96be879SSascha Hauer 443d96be879SSascha Hauer static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes) 444d96be879SSascha Hauer { 445d96be879SSascha Hauer unsigned int stat; 446d96be879SSascha Hauer u32 *buf = _buf; 447d96be879SSascha Hauer 448d96be879SSascha Hauer while (bytes > 3) { 449d96be879SSascha Hauer stat = mxcmci_poll_status(host, 450d96be879SSascha Hauer STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 451d96be879SSascha Hauer if (stat) 452d96be879SSascha Hauer return stat; 453d96be879SSascha Hauer *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS); 454d96be879SSascha Hauer bytes -= 4; 455d96be879SSascha Hauer } 456d96be879SSascha Hauer 457d96be879SSascha Hauer if (bytes) { 458d96be879SSascha Hauer u8 *b = (u8 *)buf; 459d96be879SSascha Hauer u32 tmp; 460d96be879SSascha Hauer 461d96be879SSascha Hauer stat = mxcmci_poll_status(host, 462d96be879SSascha Hauer STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 463d96be879SSascha Hauer if (stat) 464d96be879SSascha Hauer return stat; 465d96be879SSascha Hauer tmp = readl(host->base + MMC_REG_BUFFER_ACCESS); 466d96be879SSascha Hauer memcpy(b, &tmp, bytes); 467d96be879SSascha Hauer } 468d96be879SSascha Hauer 469d96be879SSascha Hauer return 0; 470d96be879SSascha Hauer } 471d96be879SSascha Hauer 472d96be879SSascha Hauer static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes) 473d96be879SSascha Hauer { 474d96be879SSascha Hauer unsigned int stat; 475d96be879SSascha Hauer u32 *buf = _buf; 476d96be879SSascha Hauer 477d96be879SSascha Hauer while (bytes > 3) { 478d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 479d96be879SSascha Hauer if (stat) 480d96be879SSascha Hauer return stat; 481d96be879SSascha Hauer writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS); 482d96be879SSascha Hauer bytes -= 4; 483d96be879SSascha Hauer } 484d96be879SSascha Hauer 485d96be879SSascha Hauer if (bytes) { 486d96be879SSascha Hauer u8 *b = (u8 *)buf; 487d96be879SSascha Hauer u32 tmp; 488d96be879SSascha Hauer 489d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 490d96be879SSascha Hauer if (stat) 491d96be879SSascha Hauer return stat; 492d96be879SSascha Hauer 493d96be879SSascha Hauer memcpy(&tmp, b, bytes); 494d96be879SSascha Hauer writel(tmp, host->base + MMC_REG_BUFFER_ACCESS); 495d96be879SSascha Hauer } 496d96be879SSascha Hauer 497d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 498d96be879SSascha Hauer if (stat) 499d96be879SSascha Hauer return stat; 500d96be879SSascha Hauer 501d96be879SSascha Hauer return 0; 502d96be879SSascha Hauer } 503d96be879SSascha Hauer 504d96be879SSascha Hauer static int mxcmci_transfer_data(struct mxcmci_host *host) 505d96be879SSascha Hauer { 506d96be879SSascha Hauer struct mmc_data *data = host->req->data; 507d96be879SSascha Hauer struct scatterlist *sg; 508d96be879SSascha Hauer int stat, i; 509d96be879SSascha Hauer 510d96be879SSascha Hauer host->data = data; 511d96be879SSascha Hauer host->datasize = 0; 512d96be879SSascha Hauer 513d96be879SSascha Hauer if (data->flags & MMC_DATA_READ) { 514d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 515d96be879SSascha Hauer stat = mxcmci_pull(host, sg_virt(sg), sg->length); 516d96be879SSascha Hauer if (stat) 517d96be879SSascha Hauer return stat; 518d96be879SSascha Hauer host->datasize += sg->length; 519d96be879SSascha Hauer } 520d96be879SSascha Hauer } else { 521d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 522d96be879SSascha Hauer stat = mxcmci_push(host, sg_virt(sg), sg->length); 523d96be879SSascha Hauer if (stat) 524d96be879SSascha Hauer return stat; 525d96be879SSascha Hauer host->datasize += sg->length; 526d96be879SSascha Hauer } 527d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE); 528d96be879SSascha Hauer if (stat) 529d96be879SSascha Hauer return stat; 530d96be879SSascha Hauer } 531d96be879SSascha Hauer return 0; 532d96be879SSascha Hauer } 533d96be879SSascha Hauer 534d96be879SSascha Hauer static void mxcmci_datawork(struct work_struct *work) 535d96be879SSascha Hauer { 536d96be879SSascha Hauer struct mxcmci_host *host = container_of(work, struct mxcmci_host, 537d96be879SSascha Hauer datawork); 538d96be879SSascha Hauer int datastat = mxcmci_transfer_data(host); 5394a31f2efSDaniel Mack 5404a31f2efSDaniel Mack writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 5414a31f2efSDaniel Mack host->base + MMC_REG_STATUS); 542d96be879SSascha Hauer mxcmci_finish_data(host, datastat); 543d96be879SSascha Hauer 544d96be879SSascha Hauer if (host->req->stop) { 545d96be879SSascha Hauer if (mxcmci_start_cmd(host, host->req->stop, 0)) { 546d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 547d96be879SSascha Hauer return; 548d96be879SSascha Hauer } 549d96be879SSascha Hauer } else { 550d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 551d96be879SSascha Hauer } 552d96be879SSascha Hauer } 553d96be879SSascha Hauer 554d96be879SSascha Hauer static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat) 555d96be879SSascha Hauer { 556d96be879SSascha Hauer struct mmc_data *data = host->data; 557d96be879SSascha Hauer int data_error; 558d96be879SSascha Hauer 559d96be879SSascha Hauer if (!data) 560d96be879SSascha Hauer return; 561d96be879SSascha Hauer 562d96be879SSascha Hauer data_error = mxcmci_finish_data(host, stat); 563d96be879SSascha Hauer 564d96be879SSascha Hauer mxcmci_read_response(host, stat); 565d96be879SSascha Hauer host->cmd = NULL; 566d96be879SSascha Hauer 567d96be879SSascha Hauer if (host->req->stop) { 568d96be879SSascha Hauer if (mxcmci_start_cmd(host, host->req->stop, 0)) { 569d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 570d96be879SSascha Hauer return; 571d96be879SSascha Hauer } 572d96be879SSascha Hauer } else { 573d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 574d96be879SSascha Hauer } 575d96be879SSascha Hauer } 576d96be879SSascha Hauer 577d96be879SSascha Hauer static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat) 578d96be879SSascha Hauer { 579d96be879SSascha Hauer mxcmci_read_response(host, stat); 580d96be879SSascha Hauer host->cmd = NULL; 581d96be879SSascha Hauer 582d96be879SSascha Hauer if (!host->data && host->req) { 583d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 584d96be879SSascha Hauer return; 585d96be879SSascha Hauer } 586d96be879SSascha Hauer 587d96be879SSascha Hauer /* For the DMA case the DMA engine handles the data transfer 588fd589a8fSAnand Gadiyar * automatically. For non DMA we have to do it ourselves. 589d96be879SSascha Hauer * Don't do it in interrupt context though. 590d96be879SSascha Hauer */ 591d96be879SSascha Hauer if (!mxcmci_use_dma(host) && host->data) 592d96be879SSascha Hauer schedule_work(&host->datawork); 593d96be879SSascha Hauer 594d96be879SSascha Hauer } 595d96be879SSascha Hauer 596d96be879SSascha Hauer static irqreturn_t mxcmci_irq(int irq, void *devid) 597d96be879SSascha Hauer { 598d96be879SSascha Hauer struct mxcmci_host *host = devid; 599f441b993SDaniel Mack unsigned long flags; 600f441b993SDaniel Mack bool sdio_irq; 601d96be879SSascha Hauer u32 stat; 602d96be879SSascha Hauer 603d96be879SSascha Hauer stat = readl(host->base + MMC_REG_STATUS); 6044a31f2efSDaniel Mack writel(stat & ~(STATUS_SDIO_INT_ACTIVE | STATUS_DATA_TRANS_DONE | 6054a31f2efSDaniel Mack STATUS_WRITE_OP_DONE), host->base + MMC_REG_STATUS); 606d96be879SSascha Hauer 607d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat); 608d96be879SSascha Hauer 609f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 610f441b993SDaniel Mack sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio; 611f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 612f441b993SDaniel Mack 6134a31f2efSDaniel Mack if (mxcmci_use_dma(host) && 6144a31f2efSDaniel Mack (stat & (STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE))) 6154a31f2efSDaniel Mack writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 6164a31f2efSDaniel Mack host->base + MMC_REG_STATUS); 6174a31f2efSDaniel Mack 618f441b993SDaniel Mack if (sdio_irq) { 619f441b993SDaniel Mack writel(STATUS_SDIO_INT_ACTIVE, host->base + MMC_REG_STATUS); 620f441b993SDaniel Mack mmc_signal_sdio_irq(host->mmc); 621f441b993SDaniel Mack } 622f441b993SDaniel Mack 623d96be879SSascha Hauer if (stat & STATUS_END_CMD_RESP) 624d96be879SSascha Hauer mxcmci_cmd_done(host, stat); 625f441b993SDaniel Mack 626d96be879SSascha Hauer if (mxcmci_use_dma(host) && 627d96be879SSascha Hauer (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE))) 628d96be879SSascha Hauer mxcmci_data_done(host, stat); 629f53fbde4SSascha Hauer 63016b3bf8cSEric Bénard if (host->default_irq_mask && 63116b3bf8cSEric Bénard (stat & (STATUS_CARD_INSERTION | STATUS_CARD_REMOVAL))) 63216b3bf8cSEric Bénard mmc_detect_change(host->mmc, msecs_to_jiffies(200)); 633f53fbde4SSascha Hauer 634d96be879SSascha Hauer return IRQ_HANDLED; 635d96be879SSascha Hauer } 636d96be879SSascha Hauer 637d96be879SSascha Hauer static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req) 638d96be879SSascha Hauer { 639d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 640d96be879SSascha Hauer unsigned int cmdat = host->cmdat; 641656217d2SMartin Fuzzey int error; 642d96be879SSascha Hauer 643d96be879SSascha Hauer WARN_ON(host->req != NULL); 644d96be879SSascha Hauer 645d96be879SSascha Hauer host->req = req; 646d96be879SSascha Hauer host->cmdat &= ~CMD_DAT_CONT_INIT; 647f53fbde4SSascha Hauer 648f53fbde4SSascha Hauer if (host->dma) 649d96be879SSascha Hauer host->do_dma = 1; 650f53fbde4SSascha Hauer 651d96be879SSascha Hauer if (req->data) { 652656217d2SMartin Fuzzey error = mxcmci_setup_data(host, req->data); 653656217d2SMartin Fuzzey if (error) { 654656217d2SMartin Fuzzey req->cmd->error = error; 655656217d2SMartin Fuzzey goto out; 656656217d2SMartin Fuzzey } 657656217d2SMartin Fuzzey 658d96be879SSascha Hauer 659d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_DATA_ENABLE; 660d96be879SSascha Hauer 661d96be879SSascha Hauer if (req->data->flags & MMC_DATA_WRITE) 662d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_WRITE; 663d96be879SSascha Hauer } 664d96be879SSascha Hauer 665656217d2SMartin Fuzzey error = mxcmci_start_cmd(host, req->cmd, cmdat); 666f53fbde4SSascha Hauer 667656217d2SMartin Fuzzey out: 668656217d2SMartin Fuzzey if (error) 669d96be879SSascha Hauer mxcmci_finish_request(host, req); 670d96be879SSascha Hauer } 671d96be879SSascha Hauer 672d96be879SSascha Hauer static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios) 673d96be879SSascha Hauer { 674d96be879SSascha Hauer unsigned int divider; 675d96be879SSascha Hauer int prescaler = 0; 676529aa29eSSascha Hauer unsigned int clk_in = clk_get_rate(host->clk_per); 677d96be879SSascha Hauer 678d96be879SSascha Hauer while (prescaler <= 0x800) { 679d96be879SSascha Hauer for (divider = 1; divider <= 0xF; divider++) { 680d96be879SSascha Hauer int x; 681d96be879SSascha Hauer 682d96be879SSascha Hauer x = (clk_in / (divider + 1)); 683d96be879SSascha Hauer 684d96be879SSascha Hauer if (prescaler) 685d96be879SSascha Hauer x /= (prescaler * 2); 686d96be879SSascha Hauer 687d96be879SSascha Hauer if (x <= clk_ios) 688d96be879SSascha Hauer break; 689d96be879SSascha Hauer } 690d96be879SSascha Hauer if (divider < 0x10) 691d96be879SSascha Hauer break; 692d96be879SSascha Hauer 693d96be879SSascha Hauer if (prescaler == 0) 694d96be879SSascha Hauer prescaler = 1; 695d96be879SSascha Hauer else 696d96be879SSascha Hauer prescaler <<= 1; 697d96be879SSascha Hauer } 698d96be879SSascha Hauer 699d96be879SSascha Hauer writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE); 700d96be879SSascha Hauer 701d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n", 702d96be879SSascha Hauer prescaler, divider, clk_in, clk_ios); 703d96be879SSascha Hauer } 704d96be879SSascha Hauer 705f53fbde4SSascha Hauer static int mxcmci_setup_dma(struct mmc_host *mmc) 706f53fbde4SSascha Hauer { 707f53fbde4SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 708f53fbde4SSascha Hauer struct dma_slave_config *config = &host->dma_slave_config; 709f53fbde4SSascha Hauer 710f53fbde4SSascha Hauer config->dst_addr = host->res->start + MMC_REG_BUFFER_ACCESS; 711f53fbde4SSascha Hauer config->src_addr = host->res->start + MMC_REG_BUFFER_ACCESS; 712f53fbde4SSascha Hauer config->dst_addr_width = 4; 713f53fbde4SSascha Hauer config->src_addr_width = 4; 714f53fbde4SSascha Hauer config->dst_maxburst = host->burstlen; 715f53fbde4SSascha Hauer config->src_maxburst = host->burstlen; 716258aea76SViresh Kumar config->device_fc = false; 717f53fbde4SSascha Hauer 718f53fbde4SSascha Hauer return dmaengine_slave_config(host->dma, config); 719f53fbde4SSascha Hauer } 720f53fbde4SSascha Hauer 721d96be879SSascha Hauer static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 722d96be879SSascha Hauer { 723d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 724f53fbde4SSascha Hauer int burstlen, ret; 725f53fbde4SSascha Hauer 726d96be879SSascha Hauer /* 7276584cb88SSascha Hauer * use burstlen of 64 (16 words) in 4 bit mode (--> reg value 0) 7286584cb88SSascha Hauer * use burstlen of 16 (4 words) in 1 bit mode (--> reg value 16) 729d96be879SSascha Hauer */ 730d96be879SSascha Hauer if (ios->bus_width == MMC_BUS_WIDTH_4) 731f53fbde4SSascha Hauer burstlen = 16; 7326584cb88SSascha Hauer else 7336584cb88SSascha Hauer burstlen = 4; 734d96be879SSascha Hauer 735f53fbde4SSascha Hauer if (mxcmci_use_dma(host) && burstlen != host->burstlen) { 736f53fbde4SSascha Hauer host->burstlen = burstlen; 737f53fbde4SSascha Hauer ret = mxcmci_setup_dma(mmc); 738f53fbde4SSascha Hauer if (ret) { 739f53fbde4SSascha Hauer dev_err(mmc_dev(host->mmc), 740f53fbde4SSascha Hauer "failed to config DMA channel. Falling back to PIO\n"); 741f53fbde4SSascha Hauer dma_release_channel(host->dma); 742f53fbde4SSascha Hauer host->do_dma = 0; 743e58f516fSSascha Hauer host->dma = NULL; 744f53fbde4SSascha Hauer } 745f53fbde4SSascha Hauer } 746f53fbde4SSascha Hauer 747d96be879SSascha Hauer if (ios->bus_width == MMC_BUS_WIDTH_4) 748d96be879SSascha Hauer host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4; 749d96be879SSascha Hauer else 750d96be879SSascha Hauer host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4; 751d96be879SSascha Hauer 752d96be879SSascha Hauer if (host->power_mode != ios->power_mode) { 753d078d242SAlberto Panizzo mxcmci_set_power(host, ios->power_mode, ios->vdd); 754d96be879SSascha Hauer host->power_mode = ios->power_mode; 75574b66954SAlberto Panizzo 756d96be879SSascha Hauer if (ios->power_mode == MMC_POWER_ON) 757d96be879SSascha Hauer host->cmdat |= CMD_DAT_CONT_INIT; 758d96be879SSascha Hauer } 759d96be879SSascha Hauer 760d96be879SSascha Hauer if (ios->clock) { 761d96be879SSascha Hauer mxcmci_set_clk_rate(host, ios->clock); 762d96be879SSascha Hauer writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); 763d96be879SSascha Hauer } else { 764d96be879SSascha Hauer writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK); 765d96be879SSascha Hauer } 766d96be879SSascha Hauer 767d96be879SSascha Hauer host->clock = ios->clock; 768d96be879SSascha Hauer } 769d96be879SSascha Hauer 770d96be879SSascha Hauer static irqreturn_t mxcmci_detect_irq(int irq, void *data) 771d96be879SSascha Hauer { 772d96be879SSascha Hauer struct mmc_host *mmc = data; 773d96be879SSascha Hauer 774d96be879SSascha Hauer dev_dbg(mmc_dev(mmc), "%s\n", __func__); 775d96be879SSascha Hauer 776d96be879SSascha Hauer mmc_detect_change(mmc, msecs_to_jiffies(250)); 777d96be879SSascha Hauer return IRQ_HANDLED; 778d96be879SSascha Hauer } 779d96be879SSascha Hauer 780d96be879SSascha Hauer static int mxcmci_get_ro(struct mmc_host *mmc) 781d96be879SSascha Hauer { 782d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 783d96be879SSascha Hauer 784d96be879SSascha Hauer if (host->pdata && host->pdata->get_ro) 785d96be879SSascha Hauer return !!host->pdata->get_ro(mmc_dev(mmc)); 786d96be879SSascha Hauer /* 787d96be879SSascha Hauer * Board doesn't support read only detection; let the mmc core 788d96be879SSascha Hauer * decide what to do. 789d96be879SSascha Hauer */ 790d96be879SSascha Hauer return -ENOSYS; 791d96be879SSascha Hauer } 792d96be879SSascha Hauer 793f441b993SDaniel Mack static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable) 794f441b993SDaniel Mack { 795f441b993SDaniel Mack struct mxcmci_host *host = mmc_priv(mmc); 796f441b993SDaniel Mack unsigned long flags; 797f441b993SDaniel Mack u32 int_cntr; 798f441b993SDaniel Mack 799f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 800f441b993SDaniel Mack host->use_sdio = enable; 801f441b993SDaniel Mack int_cntr = readl(host->base + MMC_REG_INT_CNTR); 802f441b993SDaniel Mack 803f441b993SDaniel Mack if (enable) 804f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 805f441b993SDaniel Mack else 806f441b993SDaniel Mack int_cntr &= ~INT_SDIO_IRQ_EN; 807f441b993SDaniel Mack 808f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 809f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 810f441b993SDaniel Mack } 811d96be879SSascha Hauer 8123fcb027dSDaniel Mack static void mxcmci_init_card(struct mmc_host *host, struct mmc_card *card) 8133fcb027dSDaniel Mack { 8143fcb027dSDaniel Mack /* 8153fcb027dSDaniel Mack * MX3 SoCs have a silicon bug which corrupts CRC calculation of 8163fcb027dSDaniel Mack * multi-block transfers when connected SDIO peripheral doesn't 8173fcb027dSDaniel Mack * drive the BUSY line as required by the specs. 8183fcb027dSDaniel Mack * One way to prevent this is to only allow 1-bit transfers. 8193fcb027dSDaniel Mack */ 8203fcb027dSDaniel Mack 8213fcb027dSDaniel Mack if (cpu_is_mx3() && card->type == MMC_TYPE_SDIO) 8223fcb027dSDaniel Mack host->caps &= ~MMC_CAP_4_BIT_DATA; 8233fcb027dSDaniel Mack else 8243fcb027dSDaniel Mack host->caps |= MMC_CAP_4_BIT_DATA; 8253fcb027dSDaniel Mack } 8263fcb027dSDaniel Mack 827f53fbde4SSascha Hauer static bool filter(struct dma_chan *chan, void *param) 828f53fbde4SSascha Hauer { 829f53fbde4SSascha Hauer struct mxcmci_host *host = param; 830f53fbde4SSascha Hauer 831f53fbde4SSascha Hauer if (!imx_dma_is_general_purpose(chan)) 832f53fbde4SSascha Hauer return false; 833f53fbde4SSascha Hauer 834f53fbde4SSascha Hauer chan->private = &host->dma_data; 835f53fbde4SSascha Hauer 836f53fbde4SSascha Hauer return true; 837f53fbde4SSascha Hauer } 838f53fbde4SSascha Hauer 839d96be879SSascha Hauer static const struct mmc_host_ops mxcmci_ops = { 840d96be879SSascha Hauer .request = mxcmci_request, 841d96be879SSascha Hauer .set_ios = mxcmci_set_ios, 842d96be879SSascha Hauer .get_ro = mxcmci_get_ro, 843f441b993SDaniel Mack .enable_sdio_irq = mxcmci_enable_sdio_irq, 8443fcb027dSDaniel Mack .init_card = mxcmci_init_card, 845d96be879SSascha Hauer }; 846d96be879SSascha Hauer 847d96be879SSascha Hauer static int mxcmci_probe(struct platform_device *pdev) 848d96be879SSascha Hauer { 849d96be879SSascha Hauer struct mmc_host *mmc; 850d96be879SSascha Hauer struct mxcmci_host *host = NULL; 851c0521bafSUwe Kleine-König struct resource *iores, *r; 852d96be879SSascha Hauer int ret = 0, irq; 853f53fbde4SSascha Hauer dma_cap_mask_t mask; 854d96be879SSascha Hauer 855a3c76eb9SGirish K S pr_info("i.MX SDHC driver\n"); 856d96be879SSascha Hauer 857c0521bafSUwe Kleine-König iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 858d96be879SSascha Hauer irq = platform_get_irq(pdev, 0); 859c0521bafSUwe Kleine-König if (!iores || irq < 0) 860d96be879SSascha Hauer return -EINVAL; 861d96be879SSascha Hauer 862c0521bafSUwe Kleine-König r = request_mem_region(iores->start, resource_size(iores), pdev->name); 863d96be879SSascha Hauer if (!r) 864d96be879SSascha Hauer return -EBUSY; 865d96be879SSascha Hauer 866d96be879SSascha Hauer mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev); 867d96be879SSascha Hauer if (!mmc) { 868d96be879SSascha Hauer ret = -ENOMEM; 869d96be879SSascha Hauer goto out_release_mem; 870d96be879SSascha Hauer } 871d96be879SSascha Hauer 872d96be879SSascha Hauer mmc->ops = &mxcmci_ops; 873f441b993SDaniel Mack mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; 874d96be879SSascha Hauer 875d96be879SSascha Hauer /* MMC core transfer sizes tunable parameters */ 876a36274e0SMartin K. Petersen mmc->max_segs = 64; 877d96be879SSascha Hauer mmc->max_blk_size = 2048; 878d96be879SSascha Hauer mmc->max_blk_count = 65535; 879d96be879SSascha Hauer mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; 880d759c374SVladimir Zapolskiy mmc->max_seg_size = mmc->max_req_size; 881d96be879SSascha Hauer 882d96be879SSascha Hauer host = mmc_priv(mmc); 883d96be879SSascha Hauer host->base = ioremap(r->start, resource_size(r)); 884d96be879SSascha Hauer if (!host->base) { 885d96be879SSascha Hauer ret = -ENOMEM; 886d96be879SSascha Hauer goto out_free; 887d96be879SSascha Hauer } 888d96be879SSascha Hauer 889d96be879SSascha Hauer host->mmc = mmc; 890d96be879SSascha Hauer host->pdata = pdev->dev.platform_data; 891f441b993SDaniel Mack spin_lock_init(&host->lock); 892d96be879SSascha Hauer 89374b66954SAlberto Panizzo mxcmci_init_ocr(host); 894d96be879SSascha Hauer 89516b3bf8cSEric Bénard if (host->pdata && host->pdata->dat3_card_detect) 89616b3bf8cSEric Bénard host->default_irq_mask = 89716b3bf8cSEric Bénard INT_CARD_INSERTION_EN | INT_CARD_REMOVAL_EN; 89816b3bf8cSEric Bénard else 89916b3bf8cSEric Bénard host->default_irq_mask = 0; 90016b3bf8cSEric Bénard 901d96be879SSascha Hauer host->res = r; 902d96be879SSascha Hauer host->irq = irq; 903d96be879SSascha Hauer 904529aa29eSSascha Hauer host->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 905529aa29eSSascha Hauer if (IS_ERR(host->clk_ipg)) { 906529aa29eSSascha Hauer ret = PTR_ERR(host->clk_ipg); 907d96be879SSascha Hauer goto out_iounmap; 908d96be879SSascha Hauer } 909529aa29eSSascha Hauer 910529aa29eSSascha Hauer host->clk_per = devm_clk_get(&pdev->dev, "per"); 911529aa29eSSascha Hauer if (IS_ERR(host->clk_per)) { 912529aa29eSSascha Hauer ret = PTR_ERR(host->clk_per); 913529aa29eSSascha Hauer goto out_iounmap; 914529aa29eSSascha Hauer } 915529aa29eSSascha Hauer 916529aa29eSSascha Hauer clk_prepare_enable(host->clk_per); 917529aa29eSSascha Hauer clk_prepare_enable(host->clk_ipg); 918d96be879SSascha Hauer 919d96be879SSascha Hauer mxcmci_softreset(host); 920d96be879SSascha Hauer 921d96be879SSascha Hauer host->rev_no = readw(host->base + MMC_REG_REV_NO); 922d96be879SSascha Hauer if (host->rev_no != 0x400) { 923d96be879SSascha Hauer ret = -ENODEV; 924d96be879SSascha Hauer dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n", 925d96be879SSascha Hauer host->rev_no); 926d96be879SSascha Hauer goto out_clk_put; 927d96be879SSascha Hauer } 928d96be879SSascha Hauer 929529aa29eSSascha Hauer mmc->f_min = clk_get_rate(host->clk_per) >> 16; 930529aa29eSSascha Hauer mmc->f_max = clk_get_rate(host->clk_per) >> 1; 931d96be879SSascha Hauer 932d96be879SSascha Hauer /* recommended in data sheet */ 933d96be879SSascha Hauer writew(0x2db4, host->base + MMC_REG_READ_TO); 934d96be879SSascha Hauer 93516b3bf8cSEric Bénard writel(host->default_irq_mask, host->base + MMC_REG_INT_CNTR); 936d96be879SSascha Hauer 937d96be879SSascha Hauer r = platform_get_resource(pdev, IORESOURCE_DMA, 0); 938f53fbde4SSascha Hauer if (r) { 939f53fbde4SSascha Hauer host->dmareq = r->start; 940f53fbde4SSascha Hauer host->dma_data.peripheral_type = IMX_DMATYPE_SDHC; 941f53fbde4SSascha Hauer host->dma_data.priority = DMA_PRIO_LOW; 942f53fbde4SSascha Hauer host->dma_data.dma_request = host->dmareq; 943f53fbde4SSascha Hauer dma_cap_zero(mask); 944f53fbde4SSascha Hauer dma_cap_set(DMA_SLAVE, mask); 945f53fbde4SSascha Hauer host->dma = dma_request_channel(mask, filter, host); 946f53fbde4SSascha Hauer if (host->dma) 947f53fbde4SSascha Hauer mmc->max_seg_size = dma_get_max_seg_size( 948f53fbde4SSascha Hauer host->dma->device->dev); 949d96be879SSascha Hauer } 950d96be879SSascha Hauer 951f53fbde4SSascha Hauer if (!host->dma) 952f53fbde4SSascha Hauer dev_info(mmc_dev(host->mmc), "dma not available. Using PIO\n"); 953f53fbde4SSascha Hauer 954d96be879SSascha Hauer INIT_WORK(&host->datawork, mxcmci_datawork); 955d96be879SSascha Hauer 956d96be879SSascha Hauer ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host); 957d96be879SSascha Hauer if (ret) 958d96be879SSascha Hauer goto out_free_dma; 959d96be879SSascha Hauer 960d96be879SSascha Hauer platform_set_drvdata(pdev, mmc); 961d96be879SSascha Hauer 962d96be879SSascha Hauer if (host->pdata && host->pdata->init) { 963d96be879SSascha Hauer ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq, 964d96be879SSascha Hauer host->mmc); 965d96be879SSascha Hauer if (ret) 966d96be879SSascha Hauer goto out_free_irq; 967d96be879SSascha Hauer } 968d96be879SSascha Hauer 969d96be879SSascha Hauer mmc_add_host(mmc); 970d96be879SSascha Hauer 971d96be879SSascha Hauer return 0; 972d96be879SSascha Hauer 973d96be879SSascha Hauer out_free_irq: 974d96be879SSascha Hauer free_irq(host->irq, host); 975d96be879SSascha Hauer out_free_dma: 976f53fbde4SSascha Hauer if (host->dma) 977f53fbde4SSascha Hauer dma_release_channel(host->dma); 978d96be879SSascha Hauer out_clk_put: 979529aa29eSSascha Hauer clk_disable_unprepare(host->clk_per); 980529aa29eSSascha Hauer clk_disable_unprepare(host->clk_ipg); 981d96be879SSascha Hauer out_iounmap: 982d96be879SSascha Hauer iounmap(host->base); 983d96be879SSascha Hauer out_free: 984d96be879SSascha Hauer mmc_free_host(mmc); 985d96be879SSascha Hauer out_release_mem: 986c0521bafSUwe Kleine-König release_mem_region(iores->start, resource_size(iores)); 987d96be879SSascha Hauer return ret; 988d96be879SSascha Hauer } 989d96be879SSascha Hauer 990d96be879SSascha Hauer static int mxcmci_remove(struct platform_device *pdev) 991d96be879SSascha Hauer { 992d96be879SSascha Hauer struct mmc_host *mmc = platform_get_drvdata(pdev); 993d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 994d96be879SSascha Hauer 995d96be879SSascha Hauer platform_set_drvdata(pdev, NULL); 996d96be879SSascha Hauer 997d96be879SSascha Hauer mmc_remove_host(mmc); 998d96be879SSascha Hauer 99974b66954SAlberto Panizzo if (host->vcc) 100074b66954SAlberto Panizzo regulator_put(host->vcc); 100174b66954SAlberto Panizzo 1002d96be879SSascha Hauer if (host->pdata && host->pdata->exit) 1003d96be879SSascha Hauer host->pdata->exit(&pdev->dev, mmc); 1004d96be879SSascha Hauer 1005d96be879SSascha Hauer free_irq(host->irq, host); 1006d96be879SSascha Hauer iounmap(host->base); 1007f53fbde4SSascha Hauer 1008f53fbde4SSascha Hauer if (host->dma) 1009f53fbde4SSascha Hauer dma_release_channel(host->dma); 1010f53fbde4SSascha Hauer 1011529aa29eSSascha Hauer clk_disable_unprepare(host->clk_per); 1012529aa29eSSascha Hauer clk_disable_unprepare(host->clk_ipg); 1013d96be879SSascha Hauer 1014d96be879SSascha Hauer release_mem_region(host->res->start, resource_size(host->res)); 1015d96be879SSascha Hauer 1016d96be879SSascha Hauer mmc_free_host(mmc); 1017d96be879SSascha Hauer 1018d96be879SSascha Hauer return 0; 1019d96be879SSascha Hauer } 1020d96be879SSascha Hauer 1021d96be879SSascha Hauer #ifdef CONFIG_PM 1022a7d403cfSEric Bénard static int mxcmci_suspend(struct device *dev) 1023d96be879SSascha Hauer { 1024a7d403cfSEric Bénard struct mmc_host *mmc = dev_get_drvdata(dev); 1025a7d403cfSEric Bénard struct mxcmci_host *host = mmc_priv(mmc); 1026d96be879SSascha Hauer int ret = 0; 1027d96be879SSascha Hauer 1028d96be879SSascha Hauer if (mmc) 10291a13f8faSMatt Fleming ret = mmc_suspend_host(mmc); 1030529aa29eSSascha Hauer clk_disable_unprepare(host->clk_per); 1031529aa29eSSascha Hauer clk_disable_unprepare(host->clk_ipg); 1032d96be879SSascha Hauer 1033d96be879SSascha Hauer return ret; 1034d96be879SSascha Hauer } 1035d96be879SSascha Hauer 1036a7d403cfSEric Bénard static int mxcmci_resume(struct device *dev) 1037d96be879SSascha Hauer { 1038a7d403cfSEric Bénard struct mmc_host *mmc = dev_get_drvdata(dev); 1039a7d403cfSEric Bénard struct mxcmci_host *host = mmc_priv(mmc); 1040d96be879SSascha Hauer int ret = 0; 1041d96be879SSascha Hauer 1042529aa29eSSascha Hauer clk_prepare_enable(host->clk_per); 1043529aa29eSSascha Hauer clk_prepare_enable(host->clk_ipg); 1044a7d403cfSEric Bénard if (mmc) 1045d96be879SSascha Hauer ret = mmc_resume_host(mmc); 1046d96be879SSascha Hauer 1047d96be879SSascha Hauer return ret; 1048d96be879SSascha Hauer } 1049a7d403cfSEric Bénard 1050a7d403cfSEric Bénard static const struct dev_pm_ops mxcmci_pm_ops = { 1051a7d403cfSEric Bénard .suspend = mxcmci_suspend, 1052a7d403cfSEric Bénard .resume = mxcmci_resume, 1053a7d403cfSEric Bénard }; 1054a7d403cfSEric Bénard #endif 1055d96be879SSascha Hauer 1056d96be879SSascha Hauer static struct platform_driver mxcmci_driver = { 1057d96be879SSascha Hauer .probe = mxcmci_probe, 1058d96be879SSascha Hauer .remove = mxcmci_remove, 1059d96be879SSascha Hauer .driver = { 1060d96be879SSascha Hauer .name = DRIVER_NAME, 1061d96be879SSascha Hauer .owner = THIS_MODULE, 1062a7d403cfSEric Bénard #ifdef CONFIG_PM 1063a7d403cfSEric Bénard .pm = &mxcmci_pm_ops, 1064a7d403cfSEric Bénard #endif 1065d96be879SSascha Hauer } 1066d96be879SSascha Hauer }; 1067d96be879SSascha Hauer 1068d1f81a64SAxel Lin module_platform_driver(mxcmci_driver); 1069d96be879SSascha Hauer 1070d96be879SSascha Hauer MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver"); 1071d96be879SSascha Hauer MODULE_AUTHOR("Sascha Hauer, Pengutronix"); 1072d96be879SSascha Hauer MODULE_LICENSE("GPL"); 1073d96be879SSascha Hauer MODULE_ALIAS("platform:imx-mmc"); 1074