diff options
Diffstat (limited to 'drivers/mmc/host/omap_hsmmc.c')
| -rw-r--r-- | drivers/mmc/host/omap_hsmmc.c | 1280 |
1 files changed, 1280 insertions, 0 deletions
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c new file mode 100644 index 00000000000..a631c81dce1 --- /dev/null +++ b/drivers/mmc/host/omap_hsmmc.c @@ -0,0 +1,1280 @@ +/* + * drivers/mmc/host/omap_hsmmc.c + * + * Driver for OMAP2430/3430 MMC controller. + * + * Copyright (C) 2007 Texas Instruments. + * + * Authors: + * Syed Mohammed Khasim <x0khasim@ti.com> + * Madhusudhan <madhu.cr@ti.com> + * Mohit Jalori <mjalori@ti.com> + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/platform_device.h> +#include <linux/workqueue.h> +#include <linux/timer.h> +#include <linux/clk.h> +#include <linux/mmc/host.h> +#include <linux/io.h> +#include <linux/semaphore.h> +#include <mach/dma.h> +#include <mach/hardware.h> +#include <mach/board.h> +#include <mach/mmc.h> +#include <mach/cpu.h> + +/* OMAP HSMMC Host Controller Registers */ +#define OMAP_HSMMC_SYSCONFIG 0x0010 +#define OMAP_HSMMC_CON 0x002C +#define OMAP_HSMMC_BLK 0x0104 +#define OMAP_HSMMC_ARG 0x0108 +#define OMAP_HSMMC_CMD 0x010C +#define OMAP_HSMMC_RSP10 0x0110 +#define OMAP_HSMMC_RSP32 0x0114 +#define OMAP_HSMMC_RSP54 0x0118 +#define OMAP_HSMMC_RSP76 0x011C +#define OMAP_HSMMC_DATA 0x0120 +#define OMAP_HSMMC_HCTL 0x0128 +#define OMAP_HSMMC_SYSCTL 0x012C +#define OMAP_HSMMC_STAT 0x0130 +#define OMAP_HSMMC_IE 0x0134 +#define OMAP_HSMMC_ISE 0x0138 +#define OMAP_HSMMC_CAPA 0x0140 + +#define VS18 (1 << 26) +#define VS30 (1 << 25) +#define SDVS18 (0x5 << 9) +#define SDVS30 (0x6 << 9) +#define SDVS33 (0x7 << 9) +#define SDVSCLR 0xFFFFF1FF +#define SDVSDET 0x00000400 +#define AUTOIDLE 0x1 +#define SDBP (1 << 8) +#define DTO 0xe +#define ICE 0x1 +#define ICS 0x2 +#define CEN (1 << 2) +#define CLKD_MASK 0x0000FFC0 +#define CLKD_SHIFT 6 +#define DTO_MASK 0x000F0000 +#define DTO_SHIFT 16 +#define INT_EN_MASK 0x307F0033 +#define INIT_STREAM (1 << 1) +#define DP_SELECT (1 << 21) +#define DDIR (1 << 4) +#define DMA_EN 0x1 +#define MSBS (1 << 5) +#define BCE (1 << 1) +#define FOUR_BIT (1 << 1) +#define CC 0x1 +#define TC 0x02 +#define OD 0x1 +#define ERR (1 << 15) +#define CMD_TIMEOUT (1 << 16) +#define DATA_TIMEOUT (1 << 20) +#define CMD_CRC (1 << 17) +#define DATA_CRC (1 << 21) +#define CARD_ERR (1 << 28) +#define STAT_CLEAR 0xFFFFFFFF +#define INIT_STREAM_CMD 0x00000000 +#define DUAL_VOLT_OCR_BIT 7 +#define SRC (1 << 25) +#define SRD (1 << 26) + +/* + * FIXME: Most likely all the data using these _DEVID defines should come + * from the platform_data, or implemented in controller and slot specific + * functions. + */ +#define OMAP_MMC1_DEVID 0 +#define OMAP_MMC2_DEVID 1 + +#define OMAP_MMC_DATADIR_NONE 0 +#define OMAP_MMC_DATADIR_READ 1 +#define OMAP_MMC_DATADIR_WRITE 2 +#define MMC_TIMEOUT_MS 20 +#define OMAP_MMC_MASTER_CLOCK 96000000 +#define DRIVER_NAME "mmci-omap-hs" + +/* + * One controller can have multiple slots, like on some omap boards using + * omap.c controller driver. Luckily this is not currently done on any known + * omap_hsmmc.c device. + */ +#define mmc_slot(host) (host->pdata->slots[host->slot_id]) + +/* + * MMC Host controller read/write API's + */ +#define OMAP_HSMMC_READ(base, reg) \ + __raw_readl((base) + OMAP_HSMMC_##reg) + +#define OMAP_HSMMC_WRITE(base, reg, val) \ + __raw_writel((val), (base) + OMAP_HSMMC_##reg) + +struct mmc_omap_host { + struct device *dev; + struct mmc_host *mmc; + struct mmc_request *mrq; + struct mmc_command *cmd; + struct mmc_data *data; + struct clk *fclk; + struct clk *iclk; + struct clk *dbclk; + struct semaphore sem; + struct work_struct mmc_carddetect_work; + void __iomem *base; + resource_size_t mapbase; + unsigned int id; + unsigned int dma_len; + unsigned int dma_dir; + unsigned char bus_mode; + unsigned char datadir; + u32 *buffer; + u32 bytesleft; + int suspended; + int irq; + int carddetect; + int use_dma, dma_ch; + int initstr; + int slot_id; + int dbclk_enabled; + struct omap_mmc_platform_data *pdata; +}; + +/* + * Stop clock to the card + */ +static void omap_mmc_stop_clock(struct mmc_omap_host *host) +{ + OMAP_HSMMC_WRITE(host->base, SYSCTL, + OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN); + if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0) + dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n"); +} + +/* + * Send init stream sequence to card + * before sending IDLE command + */ +static void send_init_stream(struct mmc_omap_host *host) +{ + int reg = 0; + unsigned long timeout; + + disable_irq(host->irq); + OMAP_HSMMC_WRITE(host->base, CON, + OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM); + OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD); + + timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); + while ((reg != CC) && time_before(jiffies, timeout)) + reg = OMAP_HSMMC_READ(host->base, STAT) & CC; + + OMAP_HSMMC_WRITE(host->base, CON, + OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM); + enable_irq(host->irq); +} + +static inline +int mmc_omap_cover_is_closed(struct mmc_omap_host *host) +{ + int r = 1; + + if (host->pdata->slots[host->slot_id].get_cover_state) + r = host->pdata->slots[host->slot_id].get_cover_state(host->dev, + host->slot_id); + return r; +} + +static ssize_t +mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev); + struct mmc_omap_host *host = mmc_priv(mmc); + + return sprintf(buf, "%s\n", mmc_omap_cover_is_closed(host) ? "closed" : + "open"); +} + +static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL); + +static ssize_t +mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev); + struct mmc_omap_host *host = mmc_priv(mmc); + struct omap_mmc_slot_data slot = host->pdata->slots[host->slot_id]; + + return sprintf(buf, "slot:%s\n", slot.name); +} + +static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL); + +/* + * Configure the response type and send the cmd. + */ +static void +mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd, + struct mmc_data *data) +{ + int cmdreg = 0, resptype = 0, cmdtype = 0; + + dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n", + mmc_hostname(host->mmc), cmd->opcode, cmd->arg); + host->cmd = cmd; + + /* + * Clear status bits and enable interrupts + */ + OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); + OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK); + OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK); + + if (cmd->flags & MMC_RSP_PRESENT) { + if (cmd->flags & MMC_RSP_136) + resptype = 1; + else + resptype = 2; + } + + /* + * Unlike OMAP1 controller, the cmdtype does not seem to be based on + * ac, bc, adtc, bcr. Only commands ending an open ended transfer need + * a val of 0x3, rest 0x0. + */ + if (cmd == host->mrq->stop) + cmdtype = 0x3; + + cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22); + + if (data) { + cmdreg |= DP_SELECT | MSBS | BCE; + if (data->flags & MMC_DATA_READ) + cmdreg |= DDIR; + else + cmdreg &= ~(DDIR); + } + + if (host->use_dma) + cmdreg |= DMA_EN; + + OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg); + OMAP_HSMMC_WRITE(host->base, CMD, cmdreg); +} + +/* + * Notify the transfer complete to MMC core + */ +static void +mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data) +{ + host->data = NULL; + + if (host->use_dma && host->dma_ch != -1) + dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len, + host->dma_dir); + + host->datadir = OMAP_MMC_DATADIR_NONE; + + if (!data->error) + data->bytes_xfered += data->blocks * (data->blksz); + else + data->bytes_xfered = 0; + + if (!data->stop) { + host->mrq = NULL; + mmc_request_done(host->mmc, data->mrq); + return; + } + mmc_omap_start_command(host, data->stop, NULL); +} + +/* + * Notify the core about command completion + */ +static void +mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd) +{ + host->cmd = NULL; + + if (cmd->flags & MMC_RSP_PRESENT) { + if (cmd->flags & MMC_RSP_136) { + /* response type 2 */ + cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10); + cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32); + cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54); + cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76); + } else { + /* response types 1, 1b, 3, 4, 5, 6 */ + cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10); + } + } + if (host->data == NULL || cmd->error) { + host->mrq = NULL; + mmc_request_done(host->mmc, cmd->mrq); + } +} + +/* + * DMA clean up for command errors + */ +static void mmc_dma_cleanup(struct mmc_omap_host *host) +{ + host->data->error = -ETIMEDOUT; + + if (host->use_dma && host->dma_ch != -1) { + dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len, + host->dma_dir); + omap_free_dma(host->dma_ch); + host->dma_ch = -1; + up(&host->sem); + } + host->data = NULL; + host->datadir = OMAP_MMC_DATADIR_NONE; +} + +/* + * Readable error output + */ +#ifdef CONFIG_MMC_DEBUG +static void mmc_omap_report_irq(struct mmc_omap_host *host, u32 status) +{ + /* --- means reserved bit without definition at documentation */ + static const char *mmc_omap_status_bits[] = { + "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ", + "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC", + "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---", + "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---" + }; + char res[256]; + char *buf = res; + int len, i; + + len = sprintf(buf, "MMC IRQ 0x%x :", status); + buf += len; + + for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++) + if (status & (1 << i)) { + len = sprintf(buf, " %s", mmc_omap_status_bits[i]); + buf += len; + } + + dev_dbg(mmc_dev(host->mmc), "%s\n", res); +} +#endif /* CONFIG_MMC_DEBUG */ + +/* + * MMC controller internal state machines reset + * + * Used to reset command or data internal state machines, using respectively + * SRC or SRD bit of SYSCTL register + * Can be called from interrupt context + */ +static inline void mmc_omap_reset_controller_fsm(struct mmc_omap_host *host, + unsigned long bit) +{ + unsigned long i = 0; + unsigned long limit = (loops_per_jiffy * + msecs_to_jiffies(MMC_TIMEOUT_MS)); + + OMAP_HSMMC_WRITE(host->base, SYSCTL, + OMAP_HSMMC_READ(host->base, SYSCTL) | bit); + + while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) && + (i++ < limit)) + cpu_relax(); + + if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit) + dev_err(mmc_dev(host->mmc), + "Timeout waiting on controller reset in %s\n", + __func__); +} + +/* + * MMC controller IRQ handler + */ +static irqreturn_t mmc_omap_irq(int irq, void *dev_id) +{ + struct mmc_omap_host *host = dev_id; + struct mmc_data *data; + int end_cmd = 0, end_trans = 0, status; + + if (host->cmd == NULL && host->data == NULL) { + OMAP_HSMMC_WRITE(host->base, STAT, + OMAP_HSMMC_READ(host->base, STAT)); + return IRQ_HANDLED; + } + + data = host->data; + status = OMAP_HSMMC_READ(host->base, STAT); + dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status); + + if (status & ERR) { +#ifdef CONFIG_MMC_DEBUG + mmc_omap_report_irq(host, status); +#endif + if ((status & CMD_TIMEOUT) || + (status & CMD_CRC)) { + if (host->cmd) { + if (status & CMD_TIMEOUT) { + mmc_omap_reset_controller_fsm(host, SRC); + host->cmd->error = -ETIMEDOUT; + } else { + host->cmd->error = -EILSEQ; + } + end_cmd = 1; + } + if (host->data) { + mmc_dma_cleanup(host); + mmc_omap_reset_controller_fsm(host, SRD); + } + } + if ((status & DATA_TIMEOUT) || + (status & DATA_CRC)) { + if (host->data) { + if (status & DATA_TIMEOUT) + mmc_dma_cleanup(host); + else + host->data->error = -EILSEQ; + mmc_omap_reset_controller_fsm(host, SRD); + end_trans = 1; + } + } + if (status & CARD_ERR) { + dev_dbg(mmc_dev(host->mmc), + "Ignoring card err CMD%d\n", host->cmd->opcode); + if (host->cmd) + end_cmd = 1; + if (host->data) + end_trans = 1; + } + } + + OMAP_HSMMC_WRITE(host->base, STAT, status); + + if (end_cmd || (status & CC)) + mmc_omap_cmd_done(host, host->cmd); + if (end_trans || (status & TC)) + mmc_omap_xfer_done(host, data); + + return IRQ_HANDLED; +} + +/* + * Switch MMC interface voltage ... only relevant for MMC1. + * + * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver. + * The MMC2 transceiver controls are used instead of DAT4..DAT7. + * Some chips, like eMMC ones, use internal transceivers. + */ +static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd) +{ + u32 reg_val = 0; + int ret; + + if (host->id != OMAP_MMC1_DEVID) + return 0; + + /* Disable the clocks */ + clk_disable(host->fclk); + clk_disable(host->iclk); + clk_disable(host->dbclk); + + /* Turn the power off */ + ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0); + if (ret != 0) + goto err; + + /* Turn the power ON with given VDD 1.8 or 3.0v */ + ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1, vdd); + if (ret != 0) + goto err; + + clk_enable(host->fclk); + clk_enable(host->iclk); + clk_enable(host->dbclk); + + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR); + reg_val = OMAP_HSMMC_READ(host->base, HCTL); + + /* + * If a MMC dual voltage card is detected, the set_ios fn calls + * this fn with VDD bit set for 1.8V. Upon card removal from the + * slot, omap_mmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF. + * + * Cope with a bit of slop in the range ... per data sheets: + * - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max, + * but recommended values are 1.71V to 1.89V + * - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max, + * but recommended values are 2.7V to 3.3V + * + * Board setup code shouldn't permit anything very out-of-range. + * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the + * middle range) but VSIM can't power DAT4..DAT7 at more than 3V. + */ + if ((1 << vdd) <= MMC_VDD_23_24) + reg_val |= SDVS18; + else + reg_val |= SDVS30; + + OMAP_HSMMC_WRITE(host->base, HCTL, reg_val); + + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) | SDBP); + + return 0; +err: + dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n"); + return ret; +} + +/* + * Work Item to notify the core about card insertion/removal + */ +static void mmc_omap_detect(struct work_struct *work) +{ + struct mmc_omap_host *host = container_of(work, struct mmc_omap_host, + mmc_carddetect_work); + struct omap_mmc_slot_data *slot = &mmc_slot(host); + + host->carddetect = slot->card_detect(slot->card_detect_irq); + + sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch"); + if (host->carddetect) { + mmc_detect_change(host->mmc, (HZ * 200) / 1000); + } else { + mmc_omap_reset_controller_fsm(host, SRD); + mmc_detect_change(host->mmc, (HZ * 50) / 1000); + } +} + +/* + * ISR for handling card insertion and removal + */ +static irqreturn_t omap_mmc_cd_handler(int irq, void *dev_id) +{ + struct mmc_omap_host *host = (struct mmc_omap_host *)dev_id; + + schedule_work(&host->mmc_carddetect_work); + + return IRQ_HANDLED; +} + +/* + * DMA call back function + */ +static void mmc_omap_dma_cb(int lch, u16 ch_status, void *data) +{ + struct mmc_omap_host *host = data; + + if (ch_status & OMAP2_DMA_MISALIGNED_ERR_IRQ) + dev_dbg(mmc_dev(host->mmc), "MISALIGNED_ADRS_ERR\n"); + + if (host->dma_ch < 0) + return; + + omap_free_dma(host->dma_ch); + host->dma_ch = -1; + /* + * DMA Callback: run in interrupt context. + * mutex_unlock will through a kernel warning if used. + */ + up(&host->sem); +} + +/* + * Configure dma src and destination parameters + */ +static int mmc_omap_config_dma_param(int sync_dir, struct mmc_omap_host *host, + struct mmc_data *data) +{ + if (sync_dir == 0) { + omap_set_dma_dest_params(host->dma_ch, 0, + OMAP_DMA_AMODE_CONSTANT, + (host->mapbase + OMAP_HSMMC_DATA), 0, 0); + omap_set_dma_src_params(host->dma_ch, 0, + OMAP_DMA_AMODE_POST_INC, + sg_dma_address(&data->sg[0]), 0, 0); + } else { + omap_set_dma_src_params(host->dma_ch, 0, + OMAP_DMA_AMODE_CONSTANT, + (host->mapbase + OMAP_HSMMC_DATA), 0, 0); + omap_set_dma_dest_params(host->dma_ch, 0, + OMAP_DMA_AMODE_POST_INC, + sg_dma_address(&data->sg[0]), 0, 0); + } + return 0; +} +/* + * Routine to configure and start DMA for the MMC card + */ +static int +mmc_omap_start_dma_transfer(struct mmc_omap_host *host, struct mmc_request *req) +{ + int sync_dev, sync_dir = 0; + int dma_ch = 0, ret = 0, err = 1; + struct mmc_data *data = req->data; + + /* + * If for some reason the DMA transfer is still active, + * we wait for timeout period and free the dma + */ + if (host->dma_ch != -1) { + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(100); + if (down_trylock(&host->sem)) { + omap_free_dma(host->dma_ch); + host->dma_ch = -1; + up(&host->sem); + return err; + } + } else { + if (down_trylock(&host->sem)) + return err; + } + + if (!(data->flags & MMC_DATA_WRITE)) { + host->dma_dir = DMA_FROM_DEVICE; + if (host->id == OMAP_MMC1_DEVID) + sync_dev = OMAP24XX_DMA_MMC1_RX; + else + sync_dev = OMAP24XX_DMA_MMC2_RX; + } else { + host->dma_dir = DMA_TO_DEVICE; + if (host->id == OMAP_MMC1_DEVID) + sync_dev = OMAP24XX_DMA_MMC1_TX; + else + sync_dev = OMAP24XX_DMA_MMC2_TX; + } + + ret = omap_request_dma(sync_dev, "MMC/SD", mmc_omap_dma_cb, + host, &dma_ch); + if (ret != 0) { + dev_dbg(mmc_dev(host->mmc), + "%s: omap_request_dma() failed with %d\n", + mmc_hostname(host->mmc), ret); + return ret; + } + + host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, + data->sg_len, host->dma_dir); + host->dma_ch = dma_ch; + + if (!(data->flags & MMC_DATA_WRITE)) + mmc_omap_config_dma_param(1, host, data); + else + mmc_omap_config_dma_param(0, host, data); + + if ((data->blksz % 4) == 0) + omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32, + (data->blksz / 4), data->blocks, OMAP_DMA_SYNC_FRAME, + sync_dev, sync_dir); + else + /* REVISIT: The MMC buffer increments only when MSB is written. + * Return error for blksz which is non multiple of four. + */ + return -EINVAL; + + omap_start_dma(dma_ch); + return 0; +} + +static void set_data_timeout(struct mmc_omap_host *host, + struct mmc_request *req) +{ + unsigned int timeout, cycle_ns; + uint32_t reg, clkd, dto = 0; + + reg = OMAP_HSMMC_READ(host->base, SYSCTL); + clkd = (reg & CLKD_MASK) >> CLKD_SHIFT; + if (clkd == 0) + clkd = 1; + + cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd); + timeout = req->data->timeout_ns / cycle_ns; + timeout += req->data->timeout_clks; + if (timeout) { + while ((timeout & 0x80000000) == 0) { + dto += 1; + timeout <<= 1; + } + dto = 31 - dto; + timeout <<= 1; + if (timeout && dto) + dto += 1; + if (dto >= 13) + dto -= 13; + else + dto = 0; + if (dto > 14) + dto = 14; + } + + reg &= ~DTO_MASK; + reg |= dto << DTO_SHIFT; + OMAP_HSMMC_WRITE(host->base, SYSCTL, reg); +} + +/* + * Configure block length for MMC/SD cards and initiate the transfer. + */ +static int +mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req) +{ + int ret; + host->data = req->data; + + if (req->data == NULL) { + host->datadir = OMAP_MMC_DATADIR_NONE; + OMAP_HSMMC_WRITE(host->base, BLK, 0); + return 0; + } + + OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz) + | (req->data->blocks << 16)); + set_data_timeout(host, req); + + host->datadir = (req->data->flags & MMC_DATA_WRITE) ? + OMAP_MMC_DATADIR_WRITE : OMAP_MMC_DATADIR_READ; + + if (host->use_dma) { + ret = mmc_omap_start_dma_transfer(host, req); + if (ret != 0) { + dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n"); + return ret; + } + } + return 0; +} + +/* + * Request function. for read/write operation + */ +static void omap_mmc_request(struct mmc_host *mmc, struct mmc_request *req) +{ + struct mmc_omap_host *host = mmc_priv(mmc); + + WARN_ON(host->mrq != NULL); + host->mrq = req; + mmc_omap_prepare_data(host, req); + mmc_omap_start_command(host, req->cmd, req->data); +} + + +/* Routine to configure clock values. Exposed API to core */ +static void omap_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct mmc_omap_host *host = mmc_priv(mmc); + u16 dsor = 0; + unsigned long regval; + unsigned long timeout; + + switch (ios->power_mode) { + case MMC_POWER_OFF: + mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0); + /* + * Reset interface voltage to 3V if it's 1.8V now; + * only relevant on MMC-1, the others always use 1.8V. + * + * REVISIT: If we are able to detect cards after unplugging + * a 1.8V card, this code should not be needed. + */ + if (host->id != OMAP_MMC1_DEVID) + break; + if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) { + int vdd = fls(host->mmc->ocr_avail) - 1; + if (omap_mmc_switch_opcond(host, vdd) != 0) + host->mmc->ios.vdd = vdd; + } + break; + case MMC_POWER_UP: + mmc_slot(host).set_power(host->dev, host->slot_id, 1, ios->vdd); + break; + } + + switch (mmc->ios.bus_width) { + case MMC_BUS_WIDTH_4: + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT); + break; + case MMC_BUS_WIDTH_1: + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT); + break; + } + + if (host->id == OMAP_MMC1_DEVID) { + /* Only MMC1 can interface at 3V without some flavor + * of external transceiver; but they all handle 1.8V. + */ + if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) && + (ios->vdd == DUAL_VOLT_OCR_BIT)) { + /* + * The mmc_select_voltage fn of the core does + * not seem to set the power_mode to + * MMC_POWER_UP upon recalculating the voltage. + * vdd 1.8v. + */ + if (omap_mmc_switch_opcond(host, ios->vdd) != 0) + dev_dbg(mmc_dev(host->mmc), + "Switch operation failed\n"); + } + } + + if (ios->clock) { + dsor = OMAP_MMC_MASTER_CLOCK / ios->clock; + if (dsor < 1) + dsor = 1; + + if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock) + dsor++; + + if (dsor > 250) + dsor = 250; + } + omap_mmc_stop_clock(host); + regval = OMAP_HSMMC_READ(host->base, SYSCTL); + regval = regval & ~(CLKD_MASK); + regval = regval | (dsor << 6) | (DTO << 16); + OMAP_HSMMC_WRITE(host->base, SYSCTL, regval); + OMAP_HSMMC_WRITE(host->base, SYSCTL, + OMAP_HSMMC_READ(host->base, SYSCTL) | ICE); + + /* Wait till the ICS bit is set */ + timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); + while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != 0x2 + && time_before(jiffies, timeout)) + msleep(1); + + OMAP_HSMMC_WRITE(host->base, SYSCTL, + OMAP_HSMMC_READ(host->base, SYSCTL) | CEN); + + if (ios->power_mode == MMC_POWER_ON) + send_init_stream(host); + + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) + OMAP_HSMMC_WRITE(host->base, CON, + OMAP_HSMMC_READ(host->base, CON) | OD); +} + +static int omap_hsmmc_get_cd(struct mmc_host *mmc) +{ + struct mmc_omap_host *host = mmc_priv(mmc); + struct omap_mmc_platform_data *pdata = host->pdata; + + if (!pdata->slots[0].card_detect) + return -ENOSYS; + return pdata->slots[0].card_detect(pdata->slots[0].card_detect_irq); +} + +static int omap_hsmmc_get_ro(struct mmc_host *mmc) +{ + struct mmc_omap_host *host = mmc_priv(mmc); + struct omap_mmc_platform_data *pdata = host->pdata; + + if (!pdata->slots[0].get_ro) + return -ENOSYS; + return pdata->slots[0].get_ro(host->dev, 0); +} + +static struct mmc_host_ops mmc_omap_ops = { + .request = omap_mmc_request, + .set_ios = omap_mmc_set_ios, + .get_cd = omap_hsmmc_get_cd, + .get_ro = omap_hsmmc_get_ro, + /* NYET -- enable_sdio_irq */ +}; + +static int __init omap_mmc_probe(struct platform_device *pdev) +{ + struct omap_mmc_platform_data *pdata = pdev->dev.platform_data; + struct mmc_host *mmc; + struct mmc_omap_host *host = NULL; + struct resource *res; + int ret = 0, irq; + u32 hctl, capa; + + if (pdata == NULL) { + dev_err(&pdev->dev, "Platform Data is missing\n"); + return -ENXIO; + } + + if (pdata->nr_slots == 0) { + dev_err(&pdev->dev, "No Slots\n"); + return -ENXIO; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + irq = platform_get_irq(pdev, 0); + if (res == NULL || irq < 0) + return -ENXIO; + + res = request_mem_region(res->start, res->end - res->start + 1, + pdev->name); + if (res == NULL) + return -EBUSY; + + mmc = mmc_alloc_host(sizeof(struct mmc_omap_host), &pdev->dev); + if (!mmc) { + ret = -ENOMEM; + goto err; + } + + host = mmc_priv(mmc); + host->mmc = mmc; + host->pdata = pdata; + host->dev = &pdev->dev; + host->use_dma = 1; + host->dev->dma_mask = &pdata->dma_mask; + host->dma_ch = -1; + host->irq = irq; + host->id = pdev->id; + host->slot_id = 0; + host->mapbase = res->start; + host->base = ioremap(host->mapbase, SZ_4K); + + platform_set_drvdata(pdev, host); + INIT_WORK(&host->mmc_carddetect_work, mmc_omap_detect); + + mmc->ops = &mmc_omap_ops; + mmc->f_min = 400000; + mmc->f_max = 52000000; + + sema_init(&host->sem, 1); + + host->iclk = clk_get(&pdev->dev, "mmchs_ick"); + if (IS_ERR(host->iclk)) { + ret = PTR_ERR(host->iclk); + host->iclk = NULL; + goto err1; + } + host->fclk = clk_get(&pdev->dev, "mmchs_fck"); + if (IS_ERR(host->fclk)) { + ret = PTR_ERR(host->fclk); + host->fclk = NULL; + clk_put(host->iclk); + goto err1; + } + + if (clk_enable(host->fclk) != 0) { + clk_put(host->iclk); + clk_put(host->fclk); + goto err1; + } + + if (clk_enable(host->iclk) != 0) { + clk_disable(host->fclk); + clk_put(host->iclk); + clk_put(host->fclk); + goto err1; + } + + host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck"); + /* + * MMC can still work without debounce clock. + */ + if (IS_ERR(host->dbclk)) + dev_warn(mmc_dev(host->mmc), "Failed to get debounce clock\n"); + else + if (clk_enable(host->dbclk) != 0) + dev_dbg(mmc_dev(host->mmc), "Enabling debounce" + " clk failed\n"); + else + host->dbclk_enabled = 1; + +#ifdef CONFIG_MMC_BLOCK_BOUNCE + mmc->max_phys_segs = 1; + mmc->max_hw_segs = 1; +#endif + mmc->max_blk_size = 512; /* Block Length at max can be 1024 */ + mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */ + mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; + mmc->max_seg_size = mmc->max_req_size; + + mmc->ocr_avail = mmc_slot(host).ocr_mask; + mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED; + + if (pdata->slots[host->slot_id].wires >= 4) + mmc->caps |= MMC_CAP_4_BIT_DATA; + + /* Only MMC1 supports 3.0V */ + if (host->id == OMAP_MMC1_DEVID) { + hctl = SDVS30; + capa = VS30 | VS18; + } else { + hctl = SDVS18; + capa = VS18; + } + + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) | hctl); + + OMAP_HSMMC_WRITE(host->base, CAPA, + OMAP_HSMMC_READ(host->base, CAPA) | capa); + + /* Set the controller to AUTO IDLE mode */ + OMAP_HSMMC_WRITE(host->base, SYSCONFIG, + OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE); + + /* Set SD bus power bit */ + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) | SDBP); + + /* Request IRQ for MMC operations */ + ret = request_irq(host->irq, mmc_omap_irq, IRQF_DISABLED, + mmc_hostname(mmc), host); + if (ret) { + dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n"); + goto err_irq; + } + + if (pdata->init != NULL) { + if (pdata->init(&pdev->dev) != 0) { + dev_dbg(mmc_dev(host->mmc), + "Unable to configure MMC IRQs\n"); + goto err_irq_cd_init; + } + } + + /* Request IRQ for card detect */ + if ((mmc_slot(host).card_detect_irq) && (mmc_slot(host).card_detect)) { + ret = request_irq(mmc_slot(host).card_detect_irq, + omap_mmc_cd_handler, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING + | IRQF_DISABLED, + mmc_hostname(mmc), host); + if (ret) { + dev_dbg(mmc_dev(host->mmc), + "Unable to grab MMC CD IRQ\n"); + goto err_irq_cd; + } + } + + OMAP_HSMMC_WRITE(host->base, ISE, INT_EN_MASK); + OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK); + + mmc_add_host(mmc); + + if (host->pdata->slots[host->slot_id].name != NULL) { + ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name); + if (ret < 0) + goto err_slot_name; + } + if (mmc_slot(host).card_detect_irq && mmc_slot(host).card_detect && + host->pdata->slots[host->slot_id].get_cover_state) { + ret = device_create_file(&mmc->class_dev, + &dev_attr_cover_switch); + if (ret < 0) + goto err_cover_switch; + } + + return 0; + +err_cover_switch: + device_remove_file(&mmc->class_dev, &dev_attr_cover_switch); +err_slot_name: + mmc_remove_host(mmc); +err_irq_cd: + free_irq(mmc_slot(host).card_detect_irq, host); +err_irq_cd_init: + free_irq(host->irq, host); +err_irq: + clk_disable(host->fclk); + clk_disable(host->iclk); + clk_put(host->fclk); + clk_put(host->iclk); + if (host->dbclk_enabled) { + clk_disable(host->dbclk); + clk_put(host->dbclk); + } + +err1: + iounmap(host->base); +err: + dev_dbg(mmc_dev(host->mmc), "Probe Failed\n"); + release_mem_region(res->start, res->end - res->start + 1); + if (host) + mmc_free_host(mmc); + return ret; +} + +static int omap_mmc_remove(struct platform_device *pdev) +{ + struct mmc_omap_host *host = platform_get_drvdata(pdev); + struct resource *res; + + if (host) { + mmc_remove_host(host->mmc); + if (host->pdata->cleanup) + host->pdata->cleanup(&pdev->dev); + free_irq(host->irq, host); + if (mmc_slot(host).card_detect_irq) + free_irq(mmc_slot(host).card_detect_irq, host); + flush_scheduled_work(); + + clk_disable(host->fclk); + clk_disable(host->iclk); + clk_put(host->fclk); + clk_put(host->iclk); + if (host->dbclk_enabled) { + clk_disable(host->dbclk); + clk_put(host->dbclk); + } + + mmc_free_host(host->mmc); + iounmap(host->base); + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (res) + release_mem_region(res->start, res->end - res->start + 1); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +#ifdef CONFIG_PM +static int omap_mmc_suspend(struct platform_device *pdev, pm_message_t state) +{ + int ret = 0; + struct mmc_omap_host *host = platform_get_drvdata(pdev); + + if (host && host->suspended) + return 0; + + if (host) { + ret = mmc_suspend_host(host->mmc, state); + if (ret == 0) { + host->suspended = 1; + + OMAP_HSMMC_WRITE(host->base, ISE, 0); + OMAP_HSMMC_WRITE(host->base, IE, 0); + + if (host->pdata->suspend) { + ret = host->pdata->suspend(&pdev->dev, + host->slot_id); + if (ret) + dev_dbg(mmc_dev(host->mmc), + "Unable to handle MMC board" + " level suspend\n"); + } + + if (host->id == OMAP_MMC1_DEVID + && !(OMAP_HSMMC_READ(host->base, HCTL) + & SDVSDET)) { + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) + & SDVSCLR); + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) + | SDVS30); + OMAP_HSMMC_WRITE(host->base, HCTL, + OMAP_HSMMC_READ(host->base, HCTL) + | SDBP); + } + + clk_disable(host->fclk); + clk_disable(host->iclk); + clk_disable(host->dbclk); + } + + } + return ret; +} + +/* Routine to resume the MMC device */ +static int omap_mmc_resume(struct platform_device *pdev) +{ + int ret = 0; + struct mmc_omap_host *host = platform_get_drvdata(pdev); + + if (host && !host->suspended) + return 0; + + if (host) { + + ret = clk_enable(host->fclk); + if (ret) + goto clk_en_err; + + ret = clk_enable(host->iclk); + if (ret) { + clk_disable(host->fclk); + clk_put(host->fclk); + goto clk_en_err; + } + + if (clk_enable(host->dbclk) != 0) + dev_dbg(mmc_dev(host->mmc), + "Enabling debounce clk failed\n"); + + if (host->pdata->resume) { + ret = host->pdata->resume(&pdev->dev, host->slot_id); + if (ret) + dev_dbg(mmc_dev(host->mmc), + "Unmask interrupt failed\n"); + } + + /* Notify the core to resume the host */ + ret = mmc_resume_host(host->mmc); + if (ret == 0) + host->suspended = 0; + } + + return ret; + +clk_en_err: + dev_dbg(mmc_dev(host->mmc), + "Failed to enable MMC clocks during resume\n"); + return ret; +} + +#else +#define omap_mmc_suspend NULL +#define omap_mmc_resume NULL +#endif + +static struct platform_driver omap_mmc_driver = { + .probe = omap_mmc_probe, + .remove = omap_mmc_remove, + .suspend = omap_mmc_suspend, + .resume = omap_mmc_resume, + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + }, +}; + +static int __init omap_mmc_init(void) +{ + /* Register the MMC driver */ + return platform_driver_register(&omap_mmc_driver); +} + +static void __exit omap_mmc_cleanup(void) +{ + /* Unregister MMC driver */ + platform_driver_unregister(&omap_mmc_driver); +} + +module_init(omap_mmc_init); +module_exit(omap_mmc_cleanup); + +MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRIVER_NAME); +MODULE_AUTHOR("Texas Instruments Inc"); |