--- /dev/null
+/*
+ * 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 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 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) {
+ OMAP_HSMMC_WRITE(host->base, SYSCTL,
+ OMAP_HSMMC_READ(host->base,
+ SYSCTL) | SRC);
+ while (OMAP_HSMMC_READ(host->base,
+ SYSCTL) & SRC)
+ ;
+
+ host->cmd->error = -ETIMEDOUT;
+ } else {
+ host->cmd->error = -EILSEQ;
+ }
+ end_cmd = 1;
+ }
+ if (host->data)
+ mmc_dma_cleanup(host);
+ }
+ if ((status & DATA_TIMEOUT) ||
+ (status & DATA_CRC)) {
+ if (host->data) {
+ if (status & DATA_TIMEOUT)
+ mmc_dma_cleanup(host);
+ else
+ host->data->error = -EILSEQ;
+ OMAP_HSMMC_WRITE(host->base, SYSCTL,
+ OMAP_HSMMC_READ(host->base,
+ SYSCTL) | SRD);
+ while (OMAP_HSMMC_READ(host->base,
+ SYSCTL) & 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 operating voltage
+ */
+static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
+{
+ u32 reg_val = 0;
+ int ret;
+
+ /* 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.
+ *
+ * Only MMC1 supports 3.0V. MMC2 will not function if SDVS30 is
+ * set in HCTL.
+ */
+ if (host->id == OMAP_MMC1_DEVID && (((1 << vdd) == MMC_VDD_32_33) ||
+ ((1 << vdd) == MMC_VDD_33_34)))
+ reg_val |= SDVS30;
+ if ((1 << vdd) == MMC_VDD_165_195)
+ reg_val |= SDVS18;
+
+ 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);
+
+ sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
+ if (host->carddetect) {
+ mmc_detect_change(host->mmc, (HZ * 200) / 1000);
+ } else {
+ OMAP_HSMMC_WRITE(host->base, SYSCTL,
+ OMAP_HSMMC_READ(host->base, SYSCTL) | SRD);
+ while (OMAP_HSMMC_READ(host->base, SYSCTL) & 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;
+
+ host->carddetect = mmc_slot(host).card_detect(irq);
+ 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 bus voltage to 3V if it got set to 1.8V earlier.
+ * REVISIT: If we are able to detect cards after unplugging
+ * a 1.8V card, this code should not be needed.
+ */
+ 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 operate at 3V/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 (!(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");
projects / mirror_ubuntu-eoan-kernel.git / commitdiff