tmio_mmc: add bus_shift support

Some ASIC3 devices in the wild are connected with the address bus shifted
by one line, so that its 16-bit registers appear 32-bit aligned in host
memory space.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Acked-by: Ian Molton <ian@mnementh.co.uk>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c
index 49df71e6be178d77039c375d97067c0198177d1e..01add9bd628984384aca3b9950bcd4f9c15b1962 100644 (file)
--- a/drivers/mmc/host/tmio_mmc.c
+++ b/drivers/mmc/host/tmio_mmc.c
@@ -37,8 +37,6 @@
 
 static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
 {
-       void __iomem *cnf = host->cnf;
-       void __iomem *ctl = host->ctl;
        u32 clk = 0, clock, f_min = host->mmc->f_min;
 
        if (new_clock) {
@@ -50,45 +48,39 @@ static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
                        clk = 0x20000;
 
                clk >>= 2;
-               tmio_iowrite8((clk & 0x8000) ? 0 : 1, cnf + CNF_SD_CLK_MODE);
+               sd_config_write8(host, CNF_SD_CLK_MODE, (clk & 0x8000) ? 0 : 1);
                clk |= 0x100;
        }
 
-       tmio_iowrite16(clk, ctl + CTL_SD_CARD_CLK_CTL);
+       sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk);
 }
 
 static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
 {
-       void __iomem *ctl = host->ctl;
-
-       tmio_iowrite16(0x0000, ctl + CTL_CLK_AND_WAIT_CTL);
+       sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
        msleep(10);
-       tmio_iowrite16(tmio_ioread16(ctl + CTL_SD_CARD_CLK_CTL) & ~0x0100,
-              ctl + CTL_SD_CARD_CLK_CTL);
+       sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
+               sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
        msleep(10);
 }
 
 static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
 {
-       void __iomem *ctl = host->ctl;
-
-       tmio_iowrite16(tmio_ioread16(ctl + CTL_SD_CARD_CLK_CTL) | 0x0100,
-              ctl + CTL_SD_CARD_CLK_CTL);
+       sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
+               sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
        msleep(10);
-       tmio_iowrite16(0x0100, ctl + CTL_CLK_AND_WAIT_CTL);
+       sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
        msleep(10);
 }
 
 static void reset(struct tmio_mmc_host *host)
 {
-       void __iomem *ctl = host->ctl;
-
        /* FIXME - should we set stop clock reg here */
-       tmio_iowrite16(0x0000, ctl + CTL_RESET_SD);
-       tmio_iowrite16(0x0000, ctl + CTL_RESET_SDIO);
+       sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
+       sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
        msleep(10);
-       tmio_iowrite16(0x0001, ctl + CTL_RESET_SD);
-       tmio_iowrite16(0x0001, ctl + CTL_RESET_SDIO);
+       sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
+       sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
        msleep(10);
 }
 
@@ -120,13 +112,12 @@ tmio_mmc_finish_request(struct tmio_mmc_host *host)
 static int
 tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
 {
-       void __iomem *ctl = host->ctl;
        struct mmc_data *data = host->data;
        int c = cmd->opcode;
 
        /* Command 12 is handled by hardware */
        if (cmd->opcode == 12 && !cmd->arg) {
-               tmio_iowrite16(0x001, ctl + CTL_STOP_INTERNAL_ACTION);
+               sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
                return 0;
        }
 
@@ -151,18 +142,18 @@ tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
        if (data) {
                c |= DATA_PRESENT;
                if (data->blocks > 1) {
-                       tmio_iowrite16(0x100, ctl + CTL_STOP_INTERNAL_ACTION);
+                       sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
                        c |= TRANSFER_MULTI;
                }
                if (data->flags & MMC_DATA_READ)
                        c |= TRANSFER_READ;
        }
 
-       enable_mmc_irqs(ctl, TMIO_MASK_CMD);
+       enable_mmc_irqs(host, TMIO_MASK_CMD);
 
        /* Fire off the command */
-       tmio_iowrite32(cmd->arg, ctl + CTL_ARG_REG);
-       tmio_iowrite16(c, ctl + CTL_SD_CMD);
+       sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
+       sd_ctrl_write16(host, CTL_SD_CMD, c);
 
        return 0;
 }
@@ -174,7 +165,6 @@ tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
  */
 static inline void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
 {
-       void __iomem *ctl = host->ctl;
        struct mmc_data *data = host->data;
        unsigned short *buf;
        unsigned int count;
@@ -197,9 +187,9 @@ static inline void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
 
        /* Transfer the data */
        if (data->flags & MMC_DATA_READ)
-               tmio_ioread16_rep(ctl + CTL_SD_DATA_PORT, buf, count >> 1);
+               sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
        else
-               tmio_iowrite16_rep(ctl + CTL_SD_DATA_PORT, buf, count >> 1);
+               sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
 
        host->sg_off += count;
 
@@ -213,7 +203,6 @@ static inline void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
 
 static inline void tmio_mmc_data_irq(struct tmio_mmc_host *host)
 {
-       void __iomem *ctl = host->ctl;
        struct mmc_data *data = host->data;
        struct mmc_command *stop;
 
@@ -242,13 +231,13 @@ static inline void tmio_mmc_data_irq(struct tmio_mmc_host *host)
         */
 
        if (data->flags & MMC_DATA_READ)
-               disable_mmc_irqs(ctl, TMIO_MASK_READOP);
+               disable_mmc_irqs(host, TMIO_MASK_READOP);
        else
-               disable_mmc_irqs(ctl, TMIO_MASK_WRITEOP);
+               disable_mmc_irqs(host, TMIO_MASK_WRITEOP);
 
        if (stop) {
                if (stop->opcode == 12 && !stop->arg)
-                       tmio_iowrite16(0x000, ctl + CTL_STOP_INTERNAL_ACTION);
+                       sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
                else
                        BUG();
        }
@@ -259,9 +248,8 @@ static inline void tmio_mmc_data_irq(struct tmio_mmc_host *host)
 static inline void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
        unsigned int stat)
 {
-       void __iomem *ctl = host->ctl, *addr;
        struct mmc_command *cmd = host->cmd;
-       int i;
+       int i, addr;
 
        if (!host->cmd) {
                pr_debug("Spurious CMD irq\n");
@@ -275,8 +263,8 @@ static inline void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
         * modify the order of the response for short response command types.
         */
 
-       for (i = 3, addr = ctl + CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
-               cmd->resp[i] = tmio_ioread32(addr);
+       for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
+               cmd->resp[i] = sd_ctrl_read32(host, addr);
 
        if (cmd->flags &  MMC_RSP_136) {
                cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
@@ -298,9 +286,9 @@ static inline void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
         */
        if (host->data && !cmd->error) {
                if (host->data->flags & MMC_DATA_READ)
-                       enable_mmc_irqs(ctl, TMIO_MASK_READOP);
+                       enable_mmc_irqs(host, TMIO_MASK_READOP);
                else
-                       enable_mmc_irqs(ctl, TMIO_MASK_WRITEOP);
+                       enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
        } else {
                tmio_mmc_finish_request(host);
        }
@@ -312,20 +300,19 @@ static inline void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
 static irqreturn_t tmio_mmc_irq(int irq, void *devid)
 {
        struct tmio_mmc_host *host = devid;
-       void __iomem *ctl = host->ctl;
        unsigned int ireg, irq_mask, status;
 
        pr_debug("MMC IRQ begin\n");
 
-       status = tmio_ioread32(ctl + CTL_STATUS);
-       irq_mask = tmio_ioread32(ctl + CTL_IRQ_MASK);
+       status = sd_ctrl_read32(host, CTL_STATUS);
+       irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK);
        ireg = status & TMIO_MASK_IRQ & ~irq_mask;
 
        pr_debug_status(status);
        pr_debug_status(ireg);
 
        if (!ireg) {
-               disable_mmc_irqs(ctl, status & ~irq_mask);
+               disable_mmc_irqs(host, status & ~irq_mask);
 
                pr_debug("tmio_mmc: Spurious irq, disabling! "
                        "0x%08x 0x%08x 0x%08x\n", status, irq_mask, ireg);
@@ -337,7 +324,7 @@ static irqreturn_t tmio_mmc_irq(int irq, void *devid)
        while (ireg) {
                /* Card insert / remove attempts */
                if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
-                       ack_mmc_irqs(ctl, TMIO_STAT_CARD_INSERT |
+                       ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
                                TMIO_STAT_CARD_REMOVE);
                        mmc_detect_change(host->mmc, 0);
                }
@@ -349,25 +336,25 @@ static irqreturn_t tmio_mmc_irq(int irq, void *devid)
 
                /* Command completion */
                if (ireg & TMIO_MASK_CMD) {
-                       ack_mmc_irqs(ctl, TMIO_MASK_CMD);
+                       ack_mmc_irqs(host, TMIO_MASK_CMD);
                        tmio_mmc_cmd_irq(host, status);
                }
 
                /* Data transfer */
                if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
-                       ack_mmc_irqs(ctl, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
+                       ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
                        tmio_mmc_pio_irq(host);
                }
 
                /* Data transfer completion */
                if (ireg & TMIO_STAT_DATAEND) {
-                       ack_mmc_irqs(ctl, TMIO_STAT_DATAEND);
+                       ack_mmc_irqs(host, TMIO_STAT_DATAEND);
                        tmio_mmc_data_irq(host);
                }
 
                /* Check status - keep going until we've handled it all */
-               status = tmio_ioread32(ctl + CTL_STATUS);
-               irq_mask = tmio_ioread32(ctl + CTL_IRQ_MASK);
+               status = sd_ctrl_read32(host, CTL_STATUS);
+               irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK);
                ireg = status & TMIO_MASK_IRQ & ~irq_mask;
 
                pr_debug("Status at end of loop: %08x\n", status);
@@ -382,8 +369,6 @@ out:
 static int tmio_mmc_start_data(struct tmio_mmc_host *host,
        struct mmc_data *data)
 {
-       void __iomem *ctl = host->ctl;
-
        pr_debug("setup data transfer: blocksize %08x  nr_blocks %d\n",
            data->blksz, data->blocks);
 
@@ -398,8 +383,8 @@ static int tmio_mmc_start_data(struct tmio_mmc_host *host,
        host->data = data;
 
        /* Set transfer length / blocksize */
-       tmio_iowrite16(data->blksz,  ctl + CTL_SD_XFER_LEN);
-       tmio_iowrite16(data->blocks, ctl + CTL_XFER_BLK_COUNT);
+       sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
+       sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
 
        return 0;
 }
@@ -440,8 +425,6 @@ fail:
 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 {
        struct tmio_mmc_host *host = mmc_priv(mmc);
-       void __iomem *cnf = host->cnf;
-       void __iomem *ctl = host->ctl;
 
        if (ios->clock)
                tmio_mmc_set_clock(host, ios->clock);
@@ -449,12 +432,12 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
        /* Power sequence - OFF -> ON -> UP */
        switch (ios->power_mode) {
        case MMC_POWER_OFF: /* power down SD bus */
-               tmio_iowrite8(0x00, cnf + CNF_PWR_CTL_2);
+               sd_config_write8(host, CNF_PWR_CTL_2, 0x00);
                tmio_mmc_clk_stop(host);
                break;
        case MMC_POWER_ON: /* power up SD bus */
 
-               tmio_iowrite8(0x02, cnf + CNF_PWR_CTL_2);
+               sd_config_write8(host, CNF_PWR_CTL_2, 0x02);
                break;
        case MMC_POWER_UP: /* start bus clock */
                tmio_mmc_clk_start(host);
@@ -463,10 +446,10 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 
        switch (ios->bus_width) {
        case MMC_BUS_WIDTH_1:
-               tmio_iowrite16(0x80e0, ctl + CTL_SD_MEM_CARD_OPT);
+               sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
        break;
        case MMC_BUS_WIDTH_4:
-               tmio_iowrite16(0x00e0, ctl + CTL_SD_MEM_CARD_OPT);
+               sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
        break;
        }
 
@@ -477,9 +460,8 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 static int tmio_mmc_get_ro(struct mmc_host *mmc)
 {
        struct tmio_mmc_host *host = mmc_priv(mmc);
-       void __iomem *ctl = host->ctl;
 
-       return (tmio_ioread16(ctl + CTL_STATUS) & TMIO_STAT_WRPROTECT) ? 0 : 1;
+       return (sd_ctrl_read16(host, CTL_STATUS) & TMIO_STAT_WRPROTECT) ? 0 : 1;
 }
 
 static struct mmc_host_ops tmio_mmc_ops = {
@@ -509,12 +491,12 @@ static int tmio_mmc_resume(struct platform_device *dev)
        struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data;
        struct mmc_host *mmc = platform_get_drvdata(dev);
        struct tmio_mmc_host *host = mmc_priv(mmc);
-       void __iomem *cnf = host->cnf;
        int ret = 0;
 
        /* Enable the MMC/SD Control registers */
-       tmio_iowrite16(SDCREN, cnf + CNF_CMD);
-       tmio_iowrite32(dev->resource[0].start & 0xfffe, cnf + CNF_CTL_BASE);
+       sd_config_write16(host, CNF_CMD, SDCREN);
+       sd_config_write32(host, CNF_CTL_BASE,
+               (dev->resource[0].start >> host->bus_shift) & 0xfffe);
 
        /* Tell the MFD core we are ready to be enabled */
        if (cell->enable) {
@@ -566,6 +548,9 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
        host->mmc = mmc;
        platform_set_drvdata(dev, mmc);
 
+       /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
+       host->bus_shift = resource_size(res_ctl) >> 10;
+
        host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
        if (!host->ctl)
                goto host_free;
@@ -581,9 +566,9 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
        mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 
        /* Enable the MMC/SD Control registers */
-       tmio_iowrite16(SDCREN, host->cnf + CNF_CMD);
-       tmio_iowrite32(dev->resource[0].start & 0xfffe,
-               host->cnf + CNF_CTL_BASE);
+       sd_config_write16(host, CNF_CMD, SDCREN);
+       sd_config_write32(host, CNF_CTL_BASE,
+               (dev->resource[0].start >> host->bus_shift) & 0xfffe);
 
        /* Tell the MFD core we are ready to be enabled */
        if (cell->enable) {
@@ -593,13 +578,13 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
        }
 
        /* Disable SD power during suspend */
-       tmio_iowrite8(0x01, host->cnf + CNF_PWR_CTL_3);
+       sd_config_write8(host, CNF_PWR_CTL_3, 0x01);
 
        /* The below is required but why? FIXME */
-       tmio_iowrite8(0x1f, host->cnf + CNF_STOP_CLK_CTL);
+       sd_config_write8(host, CNF_STOP_CLK_CTL, 0x1f);
 
        /* Power down SD bus*/
-       tmio_iowrite8(0x0,  host->cnf + CNF_PWR_CTL_2);
+       sd_config_write8(host, CNF_PWR_CTL_2, 0x00);
 
        tmio_mmc_clk_stop(host);
        reset(host);
@@ -610,7 +595,7 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
        else
                goto unmap_cnf;
 
-       disable_mmc_irqs(host->ctl, TMIO_MASK_ALL);
+       disable_mmc_irqs(host, TMIO_MASK_ALL);
 
        ret = request_irq(host->irq, tmio_mmc_irq, IRQF_DISABLED, "tmio-mmc",
                host);
@@ -625,7 +610,7 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
               (unsigned long)host->ctl, host->irq);
 
        /* Unmask the IRQs we want to know about */
-       enable_mmc_irqs(host->ctl,  TMIO_MASK_IRQ);
+       enable_mmc_irqs(host, TMIO_MASK_IRQ);
 
        return 0;
 

diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 9c831ab2ece6d37af2bbfadce6311b85bc011c22..9fa9985949743be7920eccb0a1627036ea8dcc37 100644 (file)
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -83,34 +83,36 @@
                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) \
+
+#define enable_mmc_irqs(host, i) \
        do { \
                u32 mask;\
-               mask  = tmio_ioread32((ctl) + CTL_IRQ_MASK); \
+               mask  = sd_ctrl_read32((host), CTL_IRQ_MASK); \
                mask &= ~((i) & TMIO_MASK_IRQ); \
-               tmio_iowrite32(mask, (ctl) + CTL_IRQ_MASK); \
+               sd_ctrl_write32((host), CTL_IRQ_MASK, mask); \
        } while (0)
 
-#define disable_mmc_irqs(ctl, i) \
+#define disable_mmc_irqs(host, i) \
        do { \
                u32 mask;\
-               mask  = tmio_ioread32((ctl) + CTL_IRQ_MASK); \
+               mask  = sd_ctrl_read32((host), CTL_IRQ_MASK); \
                mask |= ((i) & TMIO_MASK_IRQ); \
-               tmio_iowrite32(mask, (ctl) + CTL_IRQ_MASK); \
+               sd_ctrl_write32((host), CTL_IRQ_MASK, mask); \
        } while (0)
 
-#define ack_mmc_irqs(ctl, i) \
+#define ack_mmc_irqs(host, i) \
        do { \
                u32 mask;\
-               mask  = tmio_ioread32((ctl) + CTL_STATUS); \
+               mask  = sd_ctrl_read32((host), CTL_STATUS); \
                mask &= ~((i) & TMIO_MASK_IRQ); \
-               tmio_iowrite32(mask, (ctl) + CTL_STATUS); \
+               sd_ctrl_write32((host), CTL_STATUS, mask); \
        } while (0)
 
 
 struct tmio_mmc_host {
        void __iomem *cnf;
        void __iomem *ctl;
+       unsigned long bus_shift;
        struct mmc_command      *cmd;
        struct mmc_request      *mrq;
        struct mmc_data         *data;
@@ -123,6 +125,63 @@ struct tmio_mmc_host {
        unsigned int            sg_off;
 };
 
+#include <linux/io.h>
+
+static inline u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr)
+{
+       return readw(host->ctl + (addr << host->bus_shift));
+}
+
+static inline void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
+               u16 *buf, int count)
+{
+       readsw(host->ctl + (addr << host->bus_shift), buf, count);
+}
+
+static inline u32 sd_ctrl_read32(struct tmio_mmc_host *host, int addr)
+{
+       return readw(host->ctl + (addr << host->bus_shift)) |
+              readw(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
+}
+
+static inline void sd_ctrl_write16(struct tmio_mmc_host *host, int addr,
+               u16 val)
+{
+       writew(val, host->ctl + (addr << host->bus_shift));
+}
+
+static inline void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
+               u16 *buf, int count)
+{
+       writesw(host->ctl + (addr << host->bus_shift), buf, count);
+}
+
+static inline void sd_ctrl_write32(struct tmio_mmc_host *host, int addr,
+               u32 val)
+{
+       writew(val, host->ctl + (addr << host->bus_shift));
+       writew(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
+}
+
+static inline void sd_config_write8(struct tmio_mmc_host *host, int addr,
+               u8 val)
+{
+       writeb(val, host->cnf + (addr << host->bus_shift));
+}
+
+static inline void sd_config_write16(struct tmio_mmc_host *host, int addr,
+               u16 val)
+{
+       writew(val, host->cnf + (addr << host->bus_shift));
+}
+
+static inline void sd_config_write32(struct tmio_mmc_host *host, int addr,
+               u32 val)
+{
+       writew(val, host->cnf + (addr << host->bus_shift));
+       writew(val >> 16, host->cnf + ((addr + 2) << host->bus_shift));
+}
+
 #include <linux/scatterlist.h>
 #include <linux/blkdev.h>