mfd: TMIO MMC driver

This patch adds support for the MMC subdevice 'cell' commonly found in
TMIO based MFDs.

Signed-off-by: Ian Molton <spyro@f2s.com>
Acked-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

1 files changed, 194 insertions, 0 deletions

diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
new file mode 100644
index 000000000000..9e647a06054f
--- /dev/null
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -0,0 +1,194 @@
+/* Definitons for use with the tmio_mmc.c
+ *
+ * (c) 2004 Ian Molton <spyro@f2s.com>
+ * (c) 2007 Ian Molton <spyro@f2s.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#define CNF_CMD     0x04
+#define CNF_CTL_BASE   0x10
+#define CNF_INT_PIN  0x3d
+#define CNF_STOP_CLK_CTL 0x40
+#define CNF_GCLK_CTL 0x41
+#define CNF_SD_CLK_MODE 0x42
+#define CNF_PIN_STATUS 0x44
+#define CNF_PWR_CTL_1 0x48
+#define CNF_PWR_CTL_2 0x49
+#define CNF_PWR_CTL_3 0x4a
+#define CNF_CARD_DETECT_MODE 0x4c
+#define CNF_SD_SLOT 0x50
+#define CNF_EXT_GCLK_CTL_1 0xf0
+#define CNF_EXT_GCLK_CTL_2 0xf1
+#define CNF_EXT_GCLK_CTL_3 0xf9
+#define CNF_SD_LED_EN_1 0xfa
+#define CNF_SD_LED_EN_2 0xfe
+
+#define   SDCREN 0x2   /* Enable access to MMC CTL regs. (flag in COMMAND_REG)*/
+
+#define CTL_SD_CMD 0x00
+#define CTL_ARG_REG 0x04
+#define CTL_STOP_INTERNAL_ACTION 0x08
+#define CTL_XFER_BLK_COUNT 0xa
+#define CTL_RESPONSE 0x0c
+#define CTL_STATUS 0x1c
+#define CTL_IRQ_MASK 0x20
+#define CTL_SD_CARD_CLK_CTL 0x24
+#define CTL_SD_XFER_LEN 0x26
+#define CTL_SD_MEM_CARD_OPT 0x28
+#define CTL_SD_ERROR_DETAIL_STATUS 0x2c
+#define CTL_SD_DATA_PORT 0x30
+#define CTL_TRANSACTION_CTL 0x34
+#define CTL_RESET_SD 0xe0
+#define CTL_SDIO_REGS 0x100
+#define CTL_CLK_AND_WAIT_CTL 0x138
+#define CTL_RESET_SDIO 0x1e0
+
+/* Definitions for values the CTRL_STATUS register can take. */
+#define TMIO_STAT_CMDRESPEND    0x00000001
+#define TMIO_STAT_DATAEND       0x00000004
+#define TMIO_STAT_CARD_REMOVE   0x00000008
+#define TMIO_STAT_CARD_INSERT   0x00000010
+#define TMIO_STAT_SIGSTATE      0x00000020
+#define TMIO_STAT_WRPROTECT     0x00000080
+#define TMIO_STAT_CARD_REMOVE_A 0x00000100
+#define TMIO_STAT_CARD_INSERT_A 0x00000200
+#define TMIO_STAT_SIGSTATE_A    0x00000400
+#define TMIO_STAT_CMD_IDX_ERR   0x00010000
+#define TMIO_STAT_CRCFAIL       0x00020000
+#define TMIO_STAT_STOPBIT_ERR   0x00040000
+#define TMIO_STAT_DATATIMEOUT   0x00080000
+#define TMIO_STAT_RXOVERFLOW    0x00100000
+#define TMIO_STAT_TXUNDERRUN    0x00200000
+#define TMIO_STAT_CMDTIMEOUT    0x00400000
+#define TMIO_STAT_RXRDY         0x01000000
+#define TMIO_STAT_TXRQ          0x02000000
+#define TMIO_STAT_ILL_FUNC      0x20000000
+#define TMIO_STAT_CMD_BUSY      0x40000000
+#define TMIO_STAT_ILL_ACCESS    0x80000000
+
+/* Define some IRQ masks */
+/* This is the mask used at reset by the chip */
+#define TMIO_MASK_ALL           0x837f031d
+#define TMIO_MASK_READOP  (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND | \
+                TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
+#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND | \
+                TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
+#define TMIO_MASK_CMD     (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
+                TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
+#define TMIO_MASK_IRQ     (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
+
+#define enable_mmc_irqs(ctl, i) \
+        do { \
+                u32 mask;\
+                mask  = tmio_ioread32((ctl) + CTL_IRQ_MASK); \
+                mask &= ~((i) & TMIO_MASK_IRQ); \
+                tmio_iowrite32(mask, (ctl) + CTL_IRQ_MASK); \
+        } while (0)
+
+#define disable_mmc_irqs(ctl, i) \
+        do { \
+                u32 mask;\
+                mask  = tmio_ioread32((ctl) + CTL_IRQ_MASK); \
+                mask |= ((i) & TMIO_MASK_IRQ); \
+                tmio_iowrite32(mask, (ctl) + CTL_IRQ_MASK); \
+        } while (0)
+
+#define ack_mmc_irqs(ctl, i) \
+        do { \
+                u32 mask;\
+                mask  = tmio_ioread32((ctl) + CTL_STATUS); \
+                mask &= ~((i) & TMIO_MASK_IRQ); \
+                tmio_iowrite32(mask, (ctl) + CTL_STATUS); \
+        } while (0)
+
+
+struct tmio_mmc_host {
+        void __iomem *cnf;
+        void __iomem *ctl;
+        struct mmc_command      *cmd;
+        struct mmc_request      *mrq;
+        struct mmc_data         *data;
+        struct mmc_host         *mmc;
+        int                     irq;
+
+        /* pio related stuff */
+        struct scatterlist      *sg_ptr;
+        unsigned int            sg_len;
+        unsigned int            sg_off;
+};
+
+#include <linux/scatterlist.h>
+#include <linux/blkdev.h>
+
+static inline void tmio_mmc_init_sg(struct tmio_mmc_host *host,
+        struct mmc_data *data)
+{
+        host->sg_len = data->sg_len;
+        host->sg_ptr = data->sg;
+        host->sg_off = 0;
+}
+
+static inline int tmio_mmc_next_sg(struct tmio_mmc_host *host)
+{
+        host->sg_ptr = sg_next(host->sg_ptr);
+        host->sg_off = 0;
+        return --host->sg_len;
+}
+
+static inline char *tmio_mmc_kmap_atomic(struct tmio_mmc_host *host,
+        unsigned long *flags)
+{
+        struct scatterlist *sg = host->sg_ptr;
+
+        local_irq_save(*flags);
+        return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
+}
+
+static inline void tmio_mmc_kunmap_atomic(struct tmio_mmc_host *host,
+        unsigned long *flags)
+{
+        kunmap_atomic(sg_page(host->sg_ptr), KM_BIO_SRC_IRQ);
+        local_irq_restore(*flags);
+}
+
+#ifdef CONFIG_MMC_DEBUG
+
+#define STATUS_TO_TEXT(a) \
+        do { \
+                if (status & TMIO_STAT_##a) \
+                        printf(#a); \
+        } while (0)
+
+void debug_status(u32 status)
+{
+        printk(KERN_DEBUG "status: %08x = ", status);
+        STATUS_TO_TEXT(CARD_REMOVE);
+        STATUS_TO_TEXT(CARD_INSERT);
+        STATUS_TO_TEXT(SIGSTATE);
+        STATUS_TO_TEXT(WRPROTECT);
+        STATUS_TO_TEXT(CARD_REMOVE_A);
+        STATUS_TO_TEXT(CARD_INSERT_A);
+        STATUS_TO_TEXT(SIGSTATE_A);
+        STATUS_TO_TEXT(CMD_IDX_ERR);
+        STATUS_TO_TEXT(STOPBIT_ERR);
+        STATUS_TO_TEXT(ILL_FUNC);
+        STATUS_TO_TEXT(CMD_BUSY);
+        STATUS_TO_TEXT(CMDRESPEND);
+        STATUS_TO_TEXT(DATAEND);
+        STATUS_TO_TEXT(CRCFAIL);
+        STATUS_TO_TEXT(DATATIMEOUT);
+        STATUS_TO_TEXT(CMDTIMEOUT);
+        STATUS_TO_TEXT(RXOVERFLOW);
+        STATUS_TO_TEXT(TXUNDERRUN);
+        STATUS_TO_TEXT(RXRDY);
+        STATUS_TO_TEXT(TXRQ);
+        STATUS_TO_TEXT(ILL_ACCESS);
+        printk("\n");
+}
+
+#else
+#define pr_debug_status(s)  do { } while (0)
+#endif