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> 34d96be879SSascha Hauer 35d96be879SSascha Hauer #include <asm/dma.h> 36d96be879SSascha Hauer #include <asm/irq.h> 37d96be879SSascha Hauer #include <asm/sizes.h> 38d96be879SSascha Hauer #include <mach/mmc.h> 39d96be879SSascha Hauer 40d96be879SSascha Hauer #ifdef CONFIG_ARCH_MX2 41d96be879SSascha Hauer #include <mach/dma-mx1-mx2.h> 42d96be879SSascha Hauer #define HAS_DMA 43d96be879SSascha Hauer #endif 44d96be879SSascha Hauer 459563b1dbSSascha Hauer #define DRIVER_NAME "mxc-mmc" 46d96be879SSascha Hauer 47d96be879SSascha Hauer #define MMC_REG_STR_STP_CLK 0x00 48d96be879SSascha Hauer #define MMC_REG_STATUS 0x04 49d96be879SSascha Hauer #define MMC_REG_CLK_RATE 0x08 50d96be879SSascha Hauer #define MMC_REG_CMD_DAT_CONT 0x0C 51d96be879SSascha Hauer #define MMC_REG_RES_TO 0x10 52d96be879SSascha Hauer #define MMC_REG_READ_TO 0x14 53d96be879SSascha Hauer #define MMC_REG_BLK_LEN 0x18 54d96be879SSascha Hauer #define MMC_REG_NOB 0x1C 55d96be879SSascha Hauer #define MMC_REG_REV_NO 0x20 56d96be879SSascha Hauer #define MMC_REG_INT_CNTR 0x24 57d96be879SSascha Hauer #define MMC_REG_CMD 0x28 58d96be879SSascha Hauer #define MMC_REG_ARG 0x2C 59d96be879SSascha Hauer #define MMC_REG_RES_FIFO 0x34 60d96be879SSascha Hauer #define MMC_REG_BUFFER_ACCESS 0x38 61d96be879SSascha Hauer 62d96be879SSascha Hauer #define STR_STP_CLK_RESET (1 << 3) 63d96be879SSascha Hauer #define STR_STP_CLK_START_CLK (1 << 1) 64d96be879SSascha Hauer #define STR_STP_CLK_STOP_CLK (1 << 0) 65d96be879SSascha Hauer 66d96be879SSascha Hauer #define STATUS_CARD_INSERTION (1 << 31) 67d96be879SSascha Hauer #define STATUS_CARD_REMOVAL (1 << 30) 68d96be879SSascha Hauer #define STATUS_YBUF_EMPTY (1 << 29) 69d96be879SSascha Hauer #define STATUS_XBUF_EMPTY (1 << 28) 70d96be879SSascha Hauer #define STATUS_YBUF_FULL (1 << 27) 71d96be879SSascha Hauer #define STATUS_XBUF_FULL (1 << 26) 72d96be879SSascha Hauer #define STATUS_BUF_UND_RUN (1 << 25) 73d96be879SSascha Hauer #define STATUS_BUF_OVFL (1 << 24) 74d96be879SSascha Hauer #define STATUS_SDIO_INT_ACTIVE (1 << 14) 75d96be879SSascha Hauer #define STATUS_END_CMD_RESP (1 << 13) 76d96be879SSascha Hauer #define STATUS_WRITE_OP_DONE (1 << 12) 77d96be879SSascha Hauer #define STATUS_DATA_TRANS_DONE (1 << 11) 78d96be879SSascha Hauer #define STATUS_READ_OP_DONE (1 << 11) 79d96be879SSascha Hauer #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10) 80d96be879SSascha Hauer #define STATUS_CARD_BUS_CLK_RUN (1 << 8) 81d96be879SSascha Hauer #define STATUS_BUF_READ_RDY (1 << 7) 82d96be879SSascha Hauer #define STATUS_BUF_WRITE_RDY (1 << 6) 83d96be879SSascha Hauer #define STATUS_RESP_CRC_ERR (1 << 5) 84d96be879SSascha Hauer #define STATUS_CRC_READ_ERR (1 << 3) 85d96be879SSascha Hauer #define STATUS_CRC_WRITE_ERR (1 << 2) 86d96be879SSascha Hauer #define STATUS_TIME_OUT_RESP (1 << 1) 87d96be879SSascha Hauer #define STATUS_TIME_OUT_READ (1 << 0) 88d96be879SSascha Hauer #define STATUS_ERR_MASK 0x2f 89d96be879SSascha Hauer 90d96be879SSascha Hauer #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12) 91d96be879SSascha Hauer #define CMD_DAT_CONT_STOP_READWAIT (1 << 11) 92d96be879SSascha Hauer #define CMD_DAT_CONT_START_READWAIT (1 << 10) 93d96be879SSascha Hauer #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8) 94d96be879SSascha Hauer #define CMD_DAT_CONT_INIT (1 << 7) 95d96be879SSascha Hauer #define CMD_DAT_CONT_WRITE (1 << 4) 96d96be879SSascha Hauer #define CMD_DAT_CONT_DATA_ENABLE (1 << 3) 97d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0) 98d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0) 99d96be879SSascha Hauer #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0) 100d96be879SSascha Hauer 101d96be879SSascha Hauer #define INT_SDIO_INT_WKP_EN (1 << 18) 102d96be879SSascha Hauer #define INT_CARD_INSERTION_WKP_EN (1 << 17) 103d96be879SSascha Hauer #define INT_CARD_REMOVAL_WKP_EN (1 << 16) 104d96be879SSascha Hauer #define INT_CARD_INSERTION_EN (1 << 15) 105d96be879SSascha Hauer #define INT_CARD_REMOVAL_EN (1 << 14) 106d96be879SSascha Hauer #define INT_SDIO_IRQ_EN (1 << 13) 107d96be879SSascha Hauer #define INT_DAT0_EN (1 << 12) 108d96be879SSascha Hauer #define INT_BUF_READ_EN (1 << 4) 109d96be879SSascha Hauer #define INT_BUF_WRITE_EN (1 << 3) 110d96be879SSascha Hauer #define INT_END_CMD_RES_EN (1 << 2) 111d96be879SSascha Hauer #define INT_WRITE_OP_DONE_EN (1 << 1) 112d96be879SSascha Hauer #define INT_READ_OP_EN (1 << 0) 113d96be879SSascha Hauer 114d96be879SSascha Hauer struct mxcmci_host { 115d96be879SSascha Hauer struct mmc_host *mmc; 116d96be879SSascha Hauer struct resource *res; 117d96be879SSascha Hauer void __iomem *base; 118d96be879SSascha Hauer int irq; 119d96be879SSascha Hauer int detect_irq; 120d96be879SSascha Hauer int dma; 121d96be879SSascha Hauer int do_dma; 122f441b993SDaniel Mack int use_sdio; 123d96be879SSascha Hauer unsigned int power_mode; 124d96be879SSascha Hauer struct imxmmc_platform_data *pdata; 125d96be879SSascha Hauer 126d96be879SSascha Hauer struct mmc_request *req; 127d96be879SSascha Hauer struct mmc_command *cmd; 128d96be879SSascha Hauer struct mmc_data *data; 129d96be879SSascha Hauer 130d96be879SSascha Hauer unsigned int dma_nents; 131d96be879SSascha Hauer unsigned int datasize; 132d96be879SSascha Hauer unsigned int dma_dir; 133d96be879SSascha Hauer 134d96be879SSascha Hauer u16 rev_no; 135d96be879SSascha Hauer unsigned int cmdat; 136d96be879SSascha Hauer 137d96be879SSascha Hauer struct clk *clk; 138d96be879SSascha Hauer 139d96be879SSascha Hauer int clock; 140d96be879SSascha Hauer 141d96be879SSascha Hauer struct work_struct datawork; 142f441b993SDaniel Mack spinlock_t lock; 143d96be879SSascha Hauer }; 144d96be879SSascha Hauer 14518489fa2SMartin Fuzzey static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios); 14618489fa2SMartin Fuzzey 147d96be879SSascha Hauer static inline int mxcmci_use_dma(struct mxcmci_host *host) 148d96be879SSascha Hauer { 149d96be879SSascha Hauer return host->do_dma; 150d96be879SSascha Hauer } 151d96be879SSascha Hauer 152d96be879SSascha Hauer static void mxcmci_softreset(struct mxcmci_host *host) 153d96be879SSascha Hauer { 154d96be879SSascha Hauer int i; 155d96be879SSascha Hauer 1564725f6f1SDaniel Mack dev_dbg(mmc_dev(host->mmc), "mxcmci_softreset\n"); 1574725f6f1SDaniel Mack 158d96be879SSascha Hauer /* reset sequence */ 159d96be879SSascha Hauer writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK); 160d96be879SSascha Hauer writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK, 161d96be879SSascha Hauer host->base + MMC_REG_STR_STP_CLK); 162d96be879SSascha Hauer 163d96be879SSascha Hauer for (i = 0; i < 8; i++) 164d96be879SSascha Hauer writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); 165d96be879SSascha Hauer 166d96be879SSascha Hauer writew(0xff, host->base + MMC_REG_RES_TO); 167d96be879SSascha Hauer } 168d96be879SSascha Hauer 169656217d2SMartin Fuzzey static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data) 170d96be879SSascha Hauer { 171d96be879SSascha Hauer unsigned int nob = data->blocks; 172d96be879SSascha Hauer unsigned int blksz = data->blksz; 173d96be879SSascha Hauer unsigned int datasize = nob * blksz; 174d96be879SSascha Hauer #ifdef HAS_DMA 175d96be879SSascha Hauer struct scatterlist *sg; 176d96be879SSascha Hauer int i; 177656217d2SMartin Fuzzey int ret; 178d96be879SSascha Hauer #endif 179d96be879SSascha Hauer if (data->flags & MMC_DATA_STREAM) 180d96be879SSascha Hauer nob = 0xffff; 181d96be879SSascha Hauer 182d96be879SSascha Hauer host->data = data; 183d96be879SSascha Hauer data->bytes_xfered = 0; 184d96be879SSascha Hauer 185d96be879SSascha Hauer writew(nob, host->base + MMC_REG_NOB); 186d96be879SSascha Hauer writew(blksz, host->base + MMC_REG_BLK_LEN); 187d96be879SSascha Hauer host->datasize = datasize; 188d96be879SSascha Hauer 189d96be879SSascha Hauer #ifdef HAS_DMA 190d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 191d96be879SSascha Hauer if (sg->offset & 3 || sg->length & 3) { 192d96be879SSascha Hauer host->do_dma = 0; 193656217d2SMartin Fuzzey return 0; 194d96be879SSascha Hauer } 195d96be879SSascha Hauer } 196d96be879SSascha Hauer 197d96be879SSascha Hauer if (data->flags & MMC_DATA_READ) { 198d96be879SSascha Hauer host->dma_dir = DMA_FROM_DEVICE; 199d96be879SSascha Hauer host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg, 200d96be879SSascha Hauer data->sg_len, host->dma_dir); 201d96be879SSascha Hauer 202656217d2SMartin Fuzzey ret = imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, 203656217d2SMartin Fuzzey datasize, 204d96be879SSascha Hauer host->res->start + MMC_REG_BUFFER_ACCESS, 205d96be879SSascha Hauer DMA_MODE_READ); 206d96be879SSascha Hauer } else { 207d96be879SSascha Hauer host->dma_dir = DMA_TO_DEVICE; 208d96be879SSascha Hauer host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg, 209d96be879SSascha Hauer data->sg_len, host->dma_dir); 210d96be879SSascha Hauer 211656217d2SMartin Fuzzey ret = imx_dma_setup_sg(host->dma, data->sg, host->dma_nents, 212656217d2SMartin Fuzzey datasize, 213d96be879SSascha Hauer host->res->start + MMC_REG_BUFFER_ACCESS, 214d96be879SSascha Hauer DMA_MODE_WRITE); 215d96be879SSascha Hauer } 216d96be879SSascha Hauer 217656217d2SMartin Fuzzey if (ret) { 218656217d2SMartin Fuzzey dev_err(mmc_dev(host->mmc), "failed to setup DMA : %d\n", ret); 219656217d2SMartin Fuzzey return ret; 220656217d2SMartin Fuzzey } 221d96be879SSascha Hauer wmb(); 222d96be879SSascha Hauer 223d96be879SSascha Hauer imx_dma_enable(host->dma); 224d96be879SSascha Hauer #endif /* HAS_DMA */ 225656217d2SMartin Fuzzey return 0; 226d96be879SSascha Hauer } 227d96be879SSascha Hauer 228d96be879SSascha Hauer static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd, 229d96be879SSascha Hauer unsigned int cmdat) 230d96be879SSascha Hauer { 231f441b993SDaniel Mack u32 int_cntr; 232f441b993SDaniel Mack unsigned long flags; 233f441b993SDaniel Mack 234d96be879SSascha Hauer WARN_ON(host->cmd != NULL); 235d96be879SSascha Hauer host->cmd = cmd; 236d96be879SSascha Hauer 237d96be879SSascha Hauer switch (mmc_resp_type(cmd)) { 238d96be879SSascha Hauer case MMC_RSP_R1: /* short CRC, OPCODE */ 239d96be879SSascha Hauer case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */ 240d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC; 241d96be879SSascha Hauer break; 242d96be879SSascha Hauer case MMC_RSP_R2: /* long 136 bit + CRC */ 243d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_136BIT; 244d96be879SSascha Hauer break; 245d96be879SSascha Hauer case MMC_RSP_R3: /* short */ 246d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_RESPONSE_48BIT; 247d96be879SSascha Hauer break; 248d96be879SSascha Hauer case MMC_RSP_NONE: 249d96be879SSascha Hauer break; 250d96be879SSascha Hauer default: 251d96be879SSascha Hauer dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n", 252d96be879SSascha Hauer mmc_resp_type(cmd)); 253d96be879SSascha Hauer cmd->error = -EINVAL; 254d96be879SSascha Hauer return -EINVAL; 255d96be879SSascha Hauer } 256d96be879SSascha Hauer 257f441b993SDaniel Mack int_cntr = INT_END_CMD_RES_EN; 258f441b993SDaniel Mack 259d96be879SSascha Hauer if (mxcmci_use_dma(host)) 260f441b993SDaniel Mack int_cntr |= INT_READ_OP_EN | INT_WRITE_OP_DONE_EN; 261f441b993SDaniel Mack 262f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 263f441b993SDaniel Mack if (host->use_sdio) 264f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 265f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 266f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 267d96be879SSascha Hauer 268d96be879SSascha Hauer writew(cmd->opcode, host->base + MMC_REG_CMD); 269d96be879SSascha Hauer writel(cmd->arg, host->base + MMC_REG_ARG); 270d96be879SSascha Hauer writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT); 271d96be879SSascha Hauer 272d96be879SSascha Hauer return 0; 273d96be879SSascha Hauer } 274d96be879SSascha Hauer 275d96be879SSascha Hauer static void mxcmci_finish_request(struct mxcmci_host *host, 276d96be879SSascha Hauer struct mmc_request *req) 277d96be879SSascha Hauer { 278f441b993SDaniel Mack u32 int_cntr = 0; 279f441b993SDaniel Mack unsigned long flags; 280f441b993SDaniel Mack 281f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 282f441b993SDaniel Mack if (host->use_sdio) 283f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 284f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 285f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 286d96be879SSascha Hauer 287d96be879SSascha Hauer host->req = NULL; 288d96be879SSascha Hauer host->cmd = NULL; 289d96be879SSascha Hauer host->data = NULL; 290d96be879SSascha Hauer 291d96be879SSascha Hauer mmc_request_done(host->mmc, req); 292d96be879SSascha Hauer } 293d96be879SSascha Hauer 294d96be879SSascha Hauer static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat) 295d96be879SSascha Hauer { 296d96be879SSascha Hauer struct mmc_data *data = host->data; 297d96be879SSascha Hauer int data_error; 298d96be879SSascha Hauer 299d96be879SSascha Hauer #ifdef HAS_DMA 300d96be879SSascha Hauer if (mxcmci_use_dma(host)) { 301d96be879SSascha Hauer imx_dma_disable(host->dma); 302d96be879SSascha Hauer dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents, 303d96be879SSascha Hauer host->dma_dir); 304d96be879SSascha Hauer } 305d96be879SSascha Hauer #endif 306d96be879SSascha Hauer 307d96be879SSascha Hauer if (stat & STATUS_ERR_MASK) { 308d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n", 309d96be879SSascha Hauer stat); 310d96be879SSascha Hauer if (stat & STATUS_CRC_READ_ERR) { 3114725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), "%s: -EILSEQ\n", __func__); 312d96be879SSascha Hauer data->error = -EILSEQ; 313d96be879SSascha Hauer } else if (stat & STATUS_CRC_WRITE_ERR) { 314d96be879SSascha Hauer u32 err_code = (stat >> 9) & 0x3; 3154725f6f1SDaniel Mack if (err_code == 2) { /* No CRC response */ 3164725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3174725f6f1SDaniel Mack "%s: No CRC -ETIMEDOUT\n", __func__); 318d96be879SSascha Hauer data->error = -ETIMEDOUT; 319d96be879SSascha Hauer } else { 3204725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3214725f6f1SDaniel Mack "%s: -EILSEQ\n", __func__); 3224725f6f1SDaniel Mack data->error = -EILSEQ; 3234725f6f1SDaniel Mack } 3244725f6f1SDaniel Mack } else if (stat & STATUS_TIME_OUT_READ) { 3254725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), 3264725f6f1SDaniel Mack "%s: read -ETIMEDOUT\n", __func__); 3274725f6f1SDaniel Mack data->error = -ETIMEDOUT; 3284725f6f1SDaniel Mack } else { 3294725f6f1SDaniel Mack dev_err(mmc_dev(host->mmc), "%s: -EIO\n", __func__); 330d96be879SSascha Hauer data->error = -EIO; 331d96be879SSascha Hauer } 332d96be879SSascha Hauer } else { 333d96be879SSascha Hauer data->bytes_xfered = host->datasize; 334d96be879SSascha Hauer } 335d96be879SSascha Hauer 336d96be879SSascha Hauer data_error = data->error; 337d96be879SSascha Hauer 338d96be879SSascha Hauer host->data = NULL; 339d96be879SSascha Hauer 340d96be879SSascha Hauer return data_error; 341d96be879SSascha Hauer } 342d96be879SSascha Hauer 343d96be879SSascha Hauer static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat) 344d96be879SSascha Hauer { 345d96be879SSascha Hauer struct mmc_command *cmd = host->cmd; 346d96be879SSascha Hauer int i; 347d96be879SSascha Hauer u32 a, b, c; 348d96be879SSascha Hauer 349d96be879SSascha Hauer if (!cmd) 350d96be879SSascha Hauer return; 351d96be879SSascha Hauer 352d96be879SSascha Hauer if (stat & STATUS_TIME_OUT_RESP) { 353d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n"); 354d96be879SSascha Hauer cmd->error = -ETIMEDOUT; 355d96be879SSascha Hauer } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) { 356d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "cmd crc error\n"); 357d96be879SSascha Hauer cmd->error = -EILSEQ; 358d96be879SSascha Hauer } 359d96be879SSascha Hauer 360d96be879SSascha Hauer if (cmd->flags & MMC_RSP_PRESENT) { 361d96be879SSascha Hauer if (cmd->flags & MMC_RSP_136) { 362d96be879SSascha Hauer for (i = 0; i < 4; i++) { 363d96be879SSascha Hauer a = readw(host->base + MMC_REG_RES_FIFO); 364d96be879SSascha Hauer b = readw(host->base + MMC_REG_RES_FIFO); 365d96be879SSascha Hauer cmd->resp[i] = a << 16 | b; 366d96be879SSascha Hauer } 367d96be879SSascha Hauer } else { 368d96be879SSascha Hauer a = readw(host->base + MMC_REG_RES_FIFO); 369d96be879SSascha Hauer b = readw(host->base + MMC_REG_RES_FIFO); 370d96be879SSascha Hauer c = readw(host->base + MMC_REG_RES_FIFO); 371d96be879SSascha Hauer cmd->resp[0] = a << 24 | b << 8 | c >> 8; 372d96be879SSascha Hauer } 373d96be879SSascha Hauer } 374d96be879SSascha Hauer } 375d96be879SSascha Hauer 376d96be879SSascha Hauer static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask) 377d96be879SSascha Hauer { 378d96be879SSascha Hauer u32 stat; 379d96be879SSascha Hauer unsigned long timeout = jiffies + HZ; 380d96be879SSascha Hauer 381d96be879SSascha Hauer do { 382d96be879SSascha Hauer stat = readl(host->base + MMC_REG_STATUS); 383d96be879SSascha Hauer if (stat & STATUS_ERR_MASK) 384d96be879SSascha Hauer return stat; 38518489fa2SMartin Fuzzey if (time_after(jiffies, timeout)) { 38618489fa2SMartin Fuzzey mxcmci_softreset(host); 38718489fa2SMartin Fuzzey mxcmci_set_clk_rate(host, host->clock); 388d96be879SSascha Hauer return STATUS_TIME_OUT_READ; 38918489fa2SMartin Fuzzey } 390d96be879SSascha Hauer if (stat & mask) 391d96be879SSascha Hauer return 0; 392d96be879SSascha Hauer cpu_relax(); 393d96be879SSascha Hauer } while (1); 394d96be879SSascha Hauer } 395d96be879SSascha Hauer 396d96be879SSascha Hauer static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes) 397d96be879SSascha Hauer { 398d96be879SSascha Hauer unsigned int stat; 399d96be879SSascha Hauer u32 *buf = _buf; 400d96be879SSascha Hauer 401d96be879SSascha Hauer while (bytes > 3) { 402d96be879SSascha Hauer stat = mxcmci_poll_status(host, 403d96be879SSascha Hauer STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 404d96be879SSascha Hauer if (stat) 405d96be879SSascha Hauer return stat; 406d96be879SSascha Hauer *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS); 407d96be879SSascha Hauer bytes -= 4; 408d96be879SSascha Hauer } 409d96be879SSascha Hauer 410d96be879SSascha Hauer if (bytes) { 411d96be879SSascha Hauer u8 *b = (u8 *)buf; 412d96be879SSascha Hauer u32 tmp; 413d96be879SSascha Hauer 414d96be879SSascha Hauer stat = mxcmci_poll_status(host, 415d96be879SSascha Hauer STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 416d96be879SSascha Hauer if (stat) 417d96be879SSascha Hauer return stat; 418d96be879SSascha Hauer tmp = readl(host->base + MMC_REG_BUFFER_ACCESS); 419d96be879SSascha Hauer memcpy(b, &tmp, bytes); 420d96be879SSascha Hauer } 421d96be879SSascha Hauer 422d96be879SSascha Hauer return 0; 423d96be879SSascha Hauer } 424d96be879SSascha Hauer 425d96be879SSascha Hauer static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes) 426d96be879SSascha Hauer { 427d96be879SSascha Hauer unsigned int stat; 428d96be879SSascha Hauer u32 *buf = _buf; 429d96be879SSascha Hauer 430d96be879SSascha Hauer while (bytes > 3) { 431d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 432d96be879SSascha Hauer if (stat) 433d96be879SSascha Hauer return stat; 434d96be879SSascha Hauer writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS); 435d96be879SSascha Hauer bytes -= 4; 436d96be879SSascha Hauer } 437d96be879SSascha Hauer 438d96be879SSascha Hauer if (bytes) { 439d96be879SSascha Hauer u8 *b = (u8 *)buf; 440d96be879SSascha Hauer u32 tmp; 441d96be879SSascha Hauer 442d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 443d96be879SSascha Hauer if (stat) 444d96be879SSascha Hauer return stat; 445d96be879SSascha Hauer 446d96be879SSascha Hauer memcpy(&tmp, b, bytes); 447d96be879SSascha Hauer writel(tmp, host->base + MMC_REG_BUFFER_ACCESS); 448d96be879SSascha Hauer } 449d96be879SSascha Hauer 450d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 451d96be879SSascha Hauer if (stat) 452d96be879SSascha Hauer return stat; 453d96be879SSascha Hauer 454d96be879SSascha Hauer return 0; 455d96be879SSascha Hauer } 456d96be879SSascha Hauer 457d96be879SSascha Hauer static int mxcmci_transfer_data(struct mxcmci_host *host) 458d96be879SSascha Hauer { 459d96be879SSascha Hauer struct mmc_data *data = host->req->data; 460d96be879SSascha Hauer struct scatterlist *sg; 461d96be879SSascha Hauer int stat, i; 462d96be879SSascha Hauer 463d96be879SSascha Hauer host->data = data; 464d96be879SSascha Hauer host->datasize = 0; 465d96be879SSascha Hauer 466d96be879SSascha Hauer if (data->flags & MMC_DATA_READ) { 467d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 468d96be879SSascha Hauer stat = mxcmci_pull(host, sg_virt(sg), sg->length); 469d96be879SSascha Hauer if (stat) 470d96be879SSascha Hauer return stat; 471d96be879SSascha Hauer host->datasize += sg->length; 472d96be879SSascha Hauer } 473d96be879SSascha Hauer } else { 474d96be879SSascha Hauer for_each_sg(data->sg, sg, data->sg_len, i) { 475d96be879SSascha Hauer stat = mxcmci_push(host, sg_virt(sg), sg->length); 476d96be879SSascha Hauer if (stat) 477d96be879SSascha Hauer return stat; 478d96be879SSascha Hauer host->datasize += sg->length; 479d96be879SSascha Hauer } 480d96be879SSascha Hauer stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE); 481d96be879SSascha Hauer if (stat) 482d96be879SSascha Hauer return stat; 483d96be879SSascha Hauer } 484d96be879SSascha Hauer return 0; 485d96be879SSascha Hauer } 486d96be879SSascha Hauer 487d96be879SSascha Hauer static void mxcmci_datawork(struct work_struct *work) 488d96be879SSascha Hauer { 489d96be879SSascha Hauer struct mxcmci_host *host = container_of(work, struct mxcmci_host, 490d96be879SSascha Hauer datawork); 491d96be879SSascha Hauer int datastat = mxcmci_transfer_data(host); 4924a31f2efSDaniel Mack 4934a31f2efSDaniel Mack writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 4944a31f2efSDaniel Mack host->base + MMC_REG_STATUS); 495d96be879SSascha Hauer mxcmci_finish_data(host, datastat); 496d96be879SSascha Hauer 497d96be879SSascha Hauer if (host->req->stop) { 498d96be879SSascha Hauer if (mxcmci_start_cmd(host, host->req->stop, 0)) { 499d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 500d96be879SSascha Hauer return; 501d96be879SSascha Hauer } 502d96be879SSascha Hauer } else { 503d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 504d96be879SSascha Hauer } 505d96be879SSascha Hauer } 506d96be879SSascha Hauer 507d96be879SSascha Hauer #ifdef HAS_DMA 508d96be879SSascha Hauer static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat) 509d96be879SSascha Hauer { 510d96be879SSascha Hauer struct mmc_data *data = host->data; 511d96be879SSascha Hauer int data_error; 512d96be879SSascha Hauer 513d96be879SSascha Hauer if (!data) 514d96be879SSascha Hauer return; 515d96be879SSascha Hauer 516d96be879SSascha Hauer data_error = mxcmci_finish_data(host, stat); 517d96be879SSascha Hauer 518d96be879SSascha Hauer mxcmci_read_response(host, stat); 519d96be879SSascha Hauer host->cmd = NULL; 520d96be879SSascha Hauer 521d96be879SSascha Hauer if (host->req->stop) { 522d96be879SSascha Hauer if (mxcmci_start_cmd(host, host->req->stop, 0)) { 523d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 524d96be879SSascha Hauer return; 525d96be879SSascha Hauer } 526d96be879SSascha Hauer } else { 527d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 528d96be879SSascha Hauer } 529d96be879SSascha Hauer } 530d96be879SSascha Hauer #endif /* HAS_DMA */ 531d96be879SSascha Hauer 532d96be879SSascha Hauer static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat) 533d96be879SSascha Hauer { 534d96be879SSascha Hauer mxcmci_read_response(host, stat); 535d96be879SSascha Hauer host->cmd = NULL; 536d96be879SSascha Hauer 537d96be879SSascha Hauer if (!host->data && host->req) { 538d96be879SSascha Hauer mxcmci_finish_request(host, host->req); 539d96be879SSascha Hauer return; 540d96be879SSascha Hauer } 541d96be879SSascha Hauer 542d96be879SSascha Hauer /* For the DMA case the DMA engine handles the data transfer 543fd589a8fSAnand Gadiyar * automatically. For non DMA we have to do it ourselves. 544d96be879SSascha Hauer * Don't do it in interrupt context though. 545d96be879SSascha Hauer */ 546d96be879SSascha Hauer if (!mxcmci_use_dma(host) && host->data) 547d96be879SSascha Hauer schedule_work(&host->datawork); 548d96be879SSascha Hauer 549d96be879SSascha Hauer } 550d96be879SSascha Hauer 551d96be879SSascha Hauer static irqreturn_t mxcmci_irq(int irq, void *devid) 552d96be879SSascha Hauer { 553d96be879SSascha Hauer struct mxcmci_host *host = devid; 554f441b993SDaniel Mack unsigned long flags; 555f441b993SDaniel Mack bool sdio_irq; 556d96be879SSascha Hauer u32 stat; 557d96be879SSascha Hauer 558d96be879SSascha Hauer stat = readl(host->base + MMC_REG_STATUS); 5594a31f2efSDaniel Mack writel(stat & ~(STATUS_SDIO_INT_ACTIVE | STATUS_DATA_TRANS_DONE | 5604a31f2efSDaniel Mack STATUS_WRITE_OP_DONE), host->base + MMC_REG_STATUS); 561d96be879SSascha Hauer 562d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat); 563d96be879SSascha Hauer 564f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 565f441b993SDaniel Mack sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio; 566f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 567f441b993SDaniel Mack 5684a31f2efSDaniel Mack #ifdef HAS_DMA 5694a31f2efSDaniel Mack if (mxcmci_use_dma(host) && 5704a31f2efSDaniel Mack (stat & (STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE))) 5714a31f2efSDaniel Mack writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 5724a31f2efSDaniel Mack host->base + MMC_REG_STATUS); 5734a31f2efSDaniel Mack #endif 5744a31f2efSDaniel Mack 575f441b993SDaniel Mack if (sdio_irq) { 576f441b993SDaniel Mack writel(STATUS_SDIO_INT_ACTIVE, host->base + MMC_REG_STATUS); 577f441b993SDaniel Mack mmc_signal_sdio_irq(host->mmc); 578f441b993SDaniel Mack } 579f441b993SDaniel Mack 580d96be879SSascha Hauer if (stat & STATUS_END_CMD_RESP) 581d96be879SSascha Hauer mxcmci_cmd_done(host, stat); 582f441b993SDaniel Mack 583d96be879SSascha Hauer #ifdef HAS_DMA 584d96be879SSascha Hauer if (mxcmci_use_dma(host) && 585d96be879SSascha Hauer (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE))) 586d96be879SSascha Hauer mxcmci_data_done(host, stat); 587d96be879SSascha Hauer #endif 588d96be879SSascha Hauer return IRQ_HANDLED; 589d96be879SSascha Hauer } 590d96be879SSascha Hauer 591d96be879SSascha Hauer static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req) 592d96be879SSascha Hauer { 593d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 594d96be879SSascha Hauer unsigned int cmdat = host->cmdat; 595656217d2SMartin Fuzzey int error; 596d96be879SSascha Hauer 597d96be879SSascha Hauer WARN_ON(host->req != NULL); 598d96be879SSascha Hauer 599d96be879SSascha Hauer host->req = req; 600d96be879SSascha Hauer host->cmdat &= ~CMD_DAT_CONT_INIT; 601d96be879SSascha Hauer #ifdef HAS_DMA 602d96be879SSascha Hauer host->do_dma = 1; 603d96be879SSascha Hauer #endif 604d96be879SSascha Hauer if (req->data) { 605656217d2SMartin Fuzzey error = mxcmci_setup_data(host, req->data); 606656217d2SMartin Fuzzey if (error) { 607656217d2SMartin Fuzzey req->cmd->error = error; 608656217d2SMartin Fuzzey goto out; 609656217d2SMartin Fuzzey } 610656217d2SMartin Fuzzey 611d96be879SSascha Hauer 612d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_DATA_ENABLE; 613d96be879SSascha Hauer 614d96be879SSascha Hauer if (req->data->flags & MMC_DATA_WRITE) 615d96be879SSascha Hauer cmdat |= CMD_DAT_CONT_WRITE; 616d96be879SSascha Hauer } 617d96be879SSascha Hauer 618656217d2SMartin Fuzzey error = mxcmci_start_cmd(host, req->cmd, cmdat); 619656217d2SMartin Fuzzey out: 620656217d2SMartin Fuzzey if (error) 621d96be879SSascha Hauer mxcmci_finish_request(host, req); 622d96be879SSascha Hauer } 623d96be879SSascha Hauer 624d96be879SSascha Hauer static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios) 625d96be879SSascha Hauer { 626d96be879SSascha Hauer unsigned int divider; 627d96be879SSascha Hauer int prescaler = 0; 628d96be879SSascha Hauer unsigned int clk_in = clk_get_rate(host->clk); 629d96be879SSascha Hauer 630d96be879SSascha Hauer while (prescaler <= 0x800) { 631d96be879SSascha Hauer for (divider = 1; divider <= 0xF; divider++) { 632d96be879SSascha Hauer int x; 633d96be879SSascha Hauer 634d96be879SSascha Hauer x = (clk_in / (divider + 1)); 635d96be879SSascha Hauer 636d96be879SSascha Hauer if (prescaler) 637d96be879SSascha Hauer x /= (prescaler * 2); 638d96be879SSascha Hauer 639d96be879SSascha Hauer if (x <= clk_ios) 640d96be879SSascha Hauer break; 641d96be879SSascha Hauer } 642d96be879SSascha Hauer if (divider < 0x10) 643d96be879SSascha Hauer break; 644d96be879SSascha Hauer 645d96be879SSascha Hauer if (prescaler == 0) 646d96be879SSascha Hauer prescaler = 1; 647d96be879SSascha Hauer else 648d96be879SSascha Hauer prescaler <<= 1; 649d96be879SSascha Hauer } 650d96be879SSascha Hauer 651d96be879SSascha Hauer writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE); 652d96be879SSascha Hauer 653d96be879SSascha Hauer dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n", 654d96be879SSascha Hauer prescaler, divider, clk_in, clk_ios); 655d96be879SSascha Hauer } 656d96be879SSascha Hauer 657d96be879SSascha Hauer static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 658d96be879SSascha Hauer { 659d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 660d96be879SSascha Hauer #ifdef HAS_DMA 661d96be879SSascha Hauer unsigned int blen; 662d96be879SSascha Hauer /* 663d96be879SSascha Hauer * use burstlen of 64 in 4 bit mode (--> reg value 0) 664d96be879SSascha Hauer * use burstlen of 16 in 1 bit mode (--> reg value 16) 665d96be879SSascha Hauer */ 666d96be879SSascha Hauer if (ios->bus_width == MMC_BUS_WIDTH_4) 667d96be879SSascha Hauer blen = 0; 668d96be879SSascha Hauer else 669d96be879SSascha Hauer blen = 16; 670d96be879SSascha Hauer 671d96be879SSascha Hauer imx_dma_config_burstlen(host->dma, blen); 672d96be879SSascha Hauer #endif 673d96be879SSascha Hauer if (ios->bus_width == MMC_BUS_WIDTH_4) 674d96be879SSascha Hauer host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4; 675d96be879SSascha Hauer else 676d96be879SSascha Hauer host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4; 677d96be879SSascha Hauer 678d96be879SSascha Hauer if (host->power_mode != ios->power_mode) { 679d96be879SSascha Hauer if (host->pdata && host->pdata->setpower) 680d96be879SSascha Hauer host->pdata->setpower(mmc_dev(mmc), ios->vdd); 681d96be879SSascha Hauer host->power_mode = ios->power_mode; 682d96be879SSascha Hauer if (ios->power_mode == MMC_POWER_ON) 683d96be879SSascha Hauer host->cmdat |= CMD_DAT_CONT_INIT; 684d96be879SSascha Hauer } 685d96be879SSascha Hauer 686d96be879SSascha Hauer if (ios->clock) { 687d96be879SSascha Hauer mxcmci_set_clk_rate(host, ios->clock); 688d96be879SSascha Hauer writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); 689d96be879SSascha Hauer } else { 690d96be879SSascha Hauer writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK); 691d96be879SSascha Hauer } 692d96be879SSascha Hauer 693d96be879SSascha Hauer host->clock = ios->clock; 694d96be879SSascha Hauer } 695d96be879SSascha Hauer 696d96be879SSascha Hauer static irqreturn_t mxcmci_detect_irq(int irq, void *data) 697d96be879SSascha Hauer { 698d96be879SSascha Hauer struct mmc_host *mmc = data; 699d96be879SSascha Hauer 700d96be879SSascha Hauer dev_dbg(mmc_dev(mmc), "%s\n", __func__); 701d96be879SSascha Hauer 702d96be879SSascha Hauer mmc_detect_change(mmc, msecs_to_jiffies(250)); 703d96be879SSascha Hauer return IRQ_HANDLED; 704d96be879SSascha Hauer } 705d96be879SSascha Hauer 706d96be879SSascha Hauer static int mxcmci_get_ro(struct mmc_host *mmc) 707d96be879SSascha Hauer { 708d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 709d96be879SSascha Hauer 710d96be879SSascha Hauer if (host->pdata && host->pdata->get_ro) 711d96be879SSascha Hauer return !!host->pdata->get_ro(mmc_dev(mmc)); 712d96be879SSascha Hauer /* 713d96be879SSascha Hauer * Board doesn't support read only detection; let the mmc core 714d96be879SSascha Hauer * decide what to do. 715d96be879SSascha Hauer */ 716d96be879SSascha Hauer return -ENOSYS; 717d96be879SSascha Hauer } 718d96be879SSascha Hauer 719f441b993SDaniel Mack static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable) 720f441b993SDaniel Mack { 721f441b993SDaniel Mack struct mxcmci_host *host = mmc_priv(mmc); 722f441b993SDaniel Mack unsigned long flags; 723f441b993SDaniel Mack u32 int_cntr; 724f441b993SDaniel Mack 725f441b993SDaniel Mack spin_lock_irqsave(&host->lock, flags); 726f441b993SDaniel Mack host->use_sdio = enable; 727f441b993SDaniel Mack int_cntr = readl(host->base + MMC_REG_INT_CNTR); 728f441b993SDaniel Mack 729f441b993SDaniel Mack if (enable) 730f441b993SDaniel Mack int_cntr |= INT_SDIO_IRQ_EN; 731f441b993SDaniel Mack else 732f441b993SDaniel Mack int_cntr &= ~INT_SDIO_IRQ_EN; 733f441b993SDaniel Mack 734f441b993SDaniel Mack writel(int_cntr, host->base + MMC_REG_INT_CNTR); 735f441b993SDaniel Mack spin_unlock_irqrestore(&host->lock, flags); 736f441b993SDaniel Mack } 737d96be879SSascha Hauer 7383fcb027dSDaniel Mack static void mxcmci_init_card(struct mmc_host *host, struct mmc_card *card) 7393fcb027dSDaniel Mack { 7403fcb027dSDaniel Mack /* 7413fcb027dSDaniel Mack * MX3 SoCs have a silicon bug which corrupts CRC calculation of 7423fcb027dSDaniel Mack * multi-block transfers when connected SDIO peripheral doesn't 7433fcb027dSDaniel Mack * drive the BUSY line as required by the specs. 7443fcb027dSDaniel Mack * One way to prevent this is to only allow 1-bit transfers. 7453fcb027dSDaniel Mack */ 7463fcb027dSDaniel Mack 7473fcb027dSDaniel Mack if (cpu_is_mx3() && card->type == MMC_TYPE_SDIO) 7483fcb027dSDaniel Mack host->caps &= ~MMC_CAP_4_BIT_DATA; 7493fcb027dSDaniel Mack else 7503fcb027dSDaniel Mack host->caps |= MMC_CAP_4_BIT_DATA; 7513fcb027dSDaniel Mack } 7523fcb027dSDaniel Mack 753d96be879SSascha Hauer static const struct mmc_host_ops mxcmci_ops = { 754d96be879SSascha Hauer .request = mxcmci_request, 755d96be879SSascha Hauer .set_ios = mxcmci_set_ios, 756d96be879SSascha Hauer .get_ro = mxcmci_get_ro, 757f441b993SDaniel Mack .enable_sdio_irq = mxcmci_enable_sdio_irq, 7583fcb027dSDaniel Mack .init_card = mxcmci_init_card, 759d96be879SSascha Hauer }; 760d96be879SSascha Hauer 761d96be879SSascha Hauer static int mxcmci_probe(struct platform_device *pdev) 762d96be879SSascha Hauer { 763d96be879SSascha Hauer struct mmc_host *mmc; 764d96be879SSascha Hauer struct mxcmci_host *host = NULL; 765c0521bafSUwe Kleine-König struct resource *iores, *r; 766d96be879SSascha Hauer int ret = 0, irq; 767d96be879SSascha Hauer 768d96be879SSascha Hauer printk(KERN_INFO "i.MX SDHC driver\n"); 769d96be879SSascha Hauer 770c0521bafSUwe Kleine-König iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 771d96be879SSascha Hauer irq = platform_get_irq(pdev, 0); 772c0521bafSUwe Kleine-König if (!iores || irq < 0) 773d96be879SSascha Hauer return -EINVAL; 774d96be879SSascha Hauer 775c0521bafSUwe Kleine-König r = request_mem_region(iores->start, resource_size(iores), pdev->name); 776d96be879SSascha Hauer if (!r) 777d96be879SSascha Hauer return -EBUSY; 778d96be879SSascha Hauer 779d96be879SSascha Hauer mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev); 780d96be879SSascha Hauer if (!mmc) { 781d96be879SSascha Hauer ret = -ENOMEM; 782d96be879SSascha Hauer goto out_release_mem; 783d96be879SSascha Hauer } 784d96be879SSascha Hauer 785d96be879SSascha Hauer mmc->ops = &mxcmci_ops; 786f441b993SDaniel Mack mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; 787d96be879SSascha Hauer 788d96be879SSascha Hauer /* MMC core transfer sizes tunable parameters */ 789d96be879SSascha Hauer mmc->max_hw_segs = 64; 790d96be879SSascha Hauer mmc->max_phys_segs = 64; 791d96be879SSascha Hauer mmc->max_blk_size = 2048; 792d96be879SSascha Hauer mmc->max_blk_count = 65535; 793d96be879SSascha Hauer mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; 794d759c374SVladimir Zapolskiy mmc->max_seg_size = mmc->max_req_size; 795d96be879SSascha Hauer 796d96be879SSascha Hauer host = mmc_priv(mmc); 797d96be879SSascha Hauer host->base = ioremap(r->start, resource_size(r)); 798d96be879SSascha Hauer if (!host->base) { 799d96be879SSascha Hauer ret = -ENOMEM; 800d96be879SSascha Hauer goto out_free; 801d96be879SSascha Hauer } 802d96be879SSascha Hauer 803d96be879SSascha Hauer host->mmc = mmc; 804d96be879SSascha Hauer host->pdata = pdev->dev.platform_data; 805f441b993SDaniel Mack spin_lock_init(&host->lock); 806d96be879SSascha Hauer 807d96be879SSascha Hauer if (host->pdata && host->pdata->ocr_avail) 808d96be879SSascha Hauer mmc->ocr_avail = host->pdata->ocr_avail; 809d96be879SSascha Hauer else 810d96be879SSascha Hauer mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 811d96be879SSascha Hauer 812d96be879SSascha Hauer host->res = r; 813d96be879SSascha Hauer host->irq = irq; 814d96be879SSascha Hauer 81506277b5cSSascha Hauer host->clk = clk_get(&pdev->dev, NULL); 816d96be879SSascha Hauer if (IS_ERR(host->clk)) { 817d96be879SSascha Hauer ret = PTR_ERR(host->clk); 818d96be879SSascha Hauer goto out_iounmap; 819d96be879SSascha Hauer } 820d96be879SSascha Hauer clk_enable(host->clk); 821d96be879SSascha Hauer 822d96be879SSascha Hauer mxcmci_softreset(host); 823d96be879SSascha Hauer 824d96be879SSascha Hauer host->rev_no = readw(host->base + MMC_REG_REV_NO); 825d96be879SSascha Hauer if (host->rev_no != 0x400) { 826d96be879SSascha Hauer ret = -ENODEV; 827d96be879SSascha Hauer dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n", 828d96be879SSascha Hauer host->rev_no); 829d96be879SSascha Hauer goto out_clk_put; 830d96be879SSascha Hauer } 831d96be879SSascha Hauer 832c499b067SSascha Hauer mmc->f_min = clk_get_rate(host->clk) >> 16; 833d96be879SSascha Hauer mmc->f_max = clk_get_rate(host->clk) >> 1; 834d96be879SSascha Hauer 835d96be879SSascha Hauer /* recommended in data sheet */ 836d96be879SSascha Hauer writew(0x2db4, host->base + MMC_REG_READ_TO); 837d96be879SSascha Hauer 838d96be879SSascha Hauer writel(0, host->base + MMC_REG_INT_CNTR); 839d96be879SSascha Hauer 840d96be879SSascha Hauer #ifdef HAS_DMA 841d96be879SSascha Hauer host->dma = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_LOW); 842d96be879SSascha Hauer if (host->dma < 0) { 843d96be879SSascha Hauer dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n"); 844d96be879SSascha Hauer ret = -EBUSY; 845d96be879SSascha Hauer goto out_clk_put; 846d96be879SSascha Hauer } 847d96be879SSascha Hauer 848d96be879SSascha Hauer r = platform_get_resource(pdev, IORESOURCE_DMA, 0); 849d96be879SSascha Hauer if (!r) { 850d96be879SSascha Hauer ret = -EINVAL; 851d96be879SSascha Hauer goto out_free_dma; 852d96be879SSascha Hauer } 853d96be879SSascha Hauer 854d96be879SSascha Hauer ret = imx_dma_config_channel(host->dma, 855d96be879SSascha Hauer IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_FIFO, 856d96be879SSascha Hauer IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR, 857d96be879SSascha Hauer r->start, 0); 858d96be879SSascha Hauer if (ret) { 859d96be879SSascha Hauer dev_err(mmc_dev(host->mmc), "failed to config DMA channel\n"); 860d96be879SSascha Hauer goto out_free_dma; 861d96be879SSascha Hauer } 862d96be879SSascha Hauer #endif 863d96be879SSascha Hauer INIT_WORK(&host->datawork, mxcmci_datawork); 864d96be879SSascha Hauer 865d96be879SSascha Hauer ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host); 866d96be879SSascha Hauer if (ret) 867d96be879SSascha Hauer goto out_free_dma; 868d96be879SSascha Hauer 869d96be879SSascha Hauer platform_set_drvdata(pdev, mmc); 870d96be879SSascha Hauer 871d96be879SSascha Hauer if (host->pdata && host->pdata->init) { 872d96be879SSascha Hauer ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq, 873d96be879SSascha Hauer host->mmc); 874d96be879SSascha Hauer if (ret) 875d96be879SSascha Hauer goto out_free_irq; 876d96be879SSascha Hauer } 877d96be879SSascha Hauer 878d96be879SSascha Hauer mmc_add_host(mmc); 879d96be879SSascha Hauer 880d96be879SSascha Hauer return 0; 881d96be879SSascha Hauer 882d96be879SSascha Hauer out_free_irq: 883d96be879SSascha Hauer free_irq(host->irq, host); 884d96be879SSascha Hauer out_free_dma: 885d96be879SSascha Hauer #ifdef HAS_DMA 886d96be879SSascha Hauer imx_dma_free(host->dma); 887d96be879SSascha Hauer #endif 888d96be879SSascha Hauer out_clk_put: 889d96be879SSascha Hauer clk_disable(host->clk); 890d96be879SSascha Hauer clk_put(host->clk); 891d96be879SSascha Hauer out_iounmap: 892d96be879SSascha Hauer iounmap(host->base); 893d96be879SSascha Hauer out_free: 894d96be879SSascha Hauer mmc_free_host(mmc); 895d96be879SSascha Hauer out_release_mem: 896c0521bafSUwe Kleine-König release_mem_region(iores->start, resource_size(iores)); 897d96be879SSascha Hauer return ret; 898d96be879SSascha Hauer } 899d96be879SSascha Hauer 900d96be879SSascha Hauer static int mxcmci_remove(struct platform_device *pdev) 901d96be879SSascha Hauer { 902d96be879SSascha Hauer struct mmc_host *mmc = platform_get_drvdata(pdev); 903d96be879SSascha Hauer struct mxcmci_host *host = mmc_priv(mmc); 904d96be879SSascha Hauer 905d96be879SSascha Hauer platform_set_drvdata(pdev, NULL); 906d96be879SSascha Hauer 907d96be879SSascha Hauer mmc_remove_host(mmc); 908d96be879SSascha Hauer 909d96be879SSascha Hauer if (host->pdata && host->pdata->exit) 910d96be879SSascha Hauer host->pdata->exit(&pdev->dev, mmc); 911d96be879SSascha Hauer 912d96be879SSascha Hauer free_irq(host->irq, host); 913d96be879SSascha Hauer iounmap(host->base); 914d96be879SSascha Hauer #ifdef HAS_DMA 915d96be879SSascha Hauer imx_dma_free(host->dma); 916d96be879SSascha Hauer #endif 917d96be879SSascha Hauer clk_disable(host->clk); 918d96be879SSascha Hauer clk_put(host->clk); 919d96be879SSascha Hauer 920d96be879SSascha Hauer release_mem_region(host->res->start, resource_size(host->res)); 921d96be879SSascha Hauer release_resource(host->res); 922d96be879SSascha Hauer 923d96be879SSascha Hauer mmc_free_host(mmc); 924d96be879SSascha Hauer 925d96be879SSascha Hauer return 0; 926d96be879SSascha Hauer } 927d96be879SSascha Hauer 928d96be879SSascha Hauer #ifdef CONFIG_PM 929d96be879SSascha Hauer static int mxcmci_suspend(struct platform_device *dev, pm_message_t state) 930d96be879SSascha Hauer { 931d96be879SSascha Hauer struct mmc_host *mmc = platform_get_drvdata(dev); 932d96be879SSascha Hauer int ret = 0; 933d96be879SSascha Hauer 934d96be879SSascha Hauer if (mmc) 935d96be879SSascha Hauer ret = mmc_suspend_host(mmc, state); 936d96be879SSascha Hauer 937d96be879SSascha Hauer return ret; 938d96be879SSascha Hauer } 939d96be879SSascha Hauer 940d96be879SSascha Hauer static int mxcmci_resume(struct platform_device *dev) 941d96be879SSascha Hauer { 942d96be879SSascha Hauer struct mmc_host *mmc = platform_get_drvdata(dev); 943d96be879SSascha Hauer struct mxcmci_host *host; 944d96be879SSascha Hauer int ret = 0; 945d96be879SSascha Hauer 946d96be879SSascha Hauer if (mmc) { 947d96be879SSascha Hauer host = mmc_priv(mmc); 948d96be879SSascha Hauer ret = mmc_resume_host(mmc); 949d96be879SSascha Hauer } 950d96be879SSascha Hauer 951d96be879SSascha Hauer return ret; 952d96be879SSascha Hauer } 953d96be879SSascha Hauer #else 954d96be879SSascha Hauer #define mxcmci_suspend NULL 955d96be879SSascha Hauer #define mxcmci_resume NULL 956d96be879SSascha Hauer #endif /* CONFIG_PM */ 957d96be879SSascha Hauer 958d96be879SSascha Hauer static struct platform_driver mxcmci_driver = { 959d96be879SSascha Hauer .probe = mxcmci_probe, 960d96be879SSascha Hauer .remove = mxcmci_remove, 961d96be879SSascha Hauer .suspend = mxcmci_suspend, 962d96be879SSascha Hauer .resume = mxcmci_resume, 963d96be879SSascha Hauer .driver = { 964d96be879SSascha Hauer .name = DRIVER_NAME, 965d96be879SSascha Hauer .owner = THIS_MODULE, 966d96be879SSascha Hauer } 967d96be879SSascha Hauer }; 968d96be879SSascha Hauer 969d96be879SSascha Hauer static int __init mxcmci_init(void) 970d96be879SSascha Hauer { 971d96be879SSascha Hauer return platform_driver_register(&mxcmci_driver); 972d96be879SSascha Hauer } 973d96be879SSascha Hauer 974d96be879SSascha Hauer static void __exit mxcmci_exit(void) 975d96be879SSascha Hauer { 976d96be879SSascha Hauer platform_driver_unregister(&mxcmci_driver); 977d96be879SSascha Hauer } 978d96be879SSascha Hauer 979d96be879SSascha Hauer module_init(mxcmci_init); 980d96be879SSascha Hauer module_exit(mxcmci_exit); 981d96be879SSascha Hauer 982d96be879SSascha Hauer MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver"); 983d96be879SSascha Hauer MODULE_AUTHOR("Sascha Hauer, Pengutronix"); 984d96be879SSascha Hauer MODULE_LICENSE("GPL"); 985d96be879SSascha Hauer MODULE_ALIAS("platform:imx-mmc"); 986