ar71xx: add AR934X specific bootstrap and reset register bits

[openwrt.git] / target / linux / ar71xx / files / drivers / spi / ar71xx_spi.c

diff --git a/target/linux/ar71xx/files/drivers/spi/ar71xx_spi.c b/target/linux/ar71xx/files/drivers/spi/ar71xx_spi.c
index 654a0c8..f548cde 100644 (file)
--- a/target/linux/ar71xx/files/drivers/spi/ar71xx_spi.c
+++ b/target/linux/ar71xx/files/drivers/spi/ar71xx_spi.c
@@ -1,7 +1,7 @@
 /*
  * Atheros AR71xx SPI Controller driver
  *
- * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
  * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -25,17 +25,17 @@
 #include <asm/mach-ar71xx/platform.h>
 
 #define DRV_DESC       "Atheros AR71xx SPI Controller driver"
-#define DRV_VERSION    "0.2.3"
+#define DRV_VERSION    "0.2.4"
 #define DRV_NAME       "ar71xx-spi"
 
 #undef PER_BIT_READ
 
 struct ar71xx_spi {
-       struct  spi_bitbang     bitbang;
+       struct  spi_bitbang     bitbang;
        u32                     ioc_base;
        u32                     reg_ctrl;
 
-       void __iomem            *base;
+       void __iomem            *base;
 
        struct platform_device  *pdev;
        u32                     (*get_ioc_base)(u8 chip_select, int cs_high,
@@ -80,10 +80,7 @@ static void ar71xx_spi_chipselect(struct spi_device *spi, int value)
                ioc_base = sp->get_ioc_base(spi->chip_select,
                                        (spi->mode & SPI_CS_HIGH) != 0,
                                        AR71XX_SPI_CS_INACTIVE);
-
                __raw_writel(ioc_base, base + SPI_REG_IOC);
-               __raw_writel(sp->reg_ctrl, base + SPI_REG_CTRL);
-               __raw_writel(0, base + SPI_REG_FS);
                break;
 
        case BITBANG_CS_ACTIVE:
@@ -91,15 +88,59 @@ static void ar71xx_spi_chipselect(struct spi_device *spi, int value)
                                        (spi->mode & SPI_CS_HIGH) != 0,
                                        AR71XX_SPI_CS_ACTIVE);
 
-               __raw_writel(SPI_FS_GPIO, base + SPI_REG_FS);
-               /* TODO: setup speed */
-               __raw_writel(0x43, base + SPI_REG_CTRL);
                __raw_writel(ioc_base, base + SPI_REG_IOC);
                sp->ioc_base = ioc_base;
                break;
        }
 }
 
+static void ar71xx_spi_setup_regs(struct spi_device *spi)
+{
+       struct ar71xx_spi *sp = spidev_to_sp(spi);
+
+       /* enable GPIO mode */
+       ar71xx_spi_wr(sp, SPI_REG_FS, SPI_FS_GPIO);
+
+       /* save CTRL register */
+       sp->reg_ctrl = ar71xx_spi_rr(sp, SPI_REG_CTRL);
+
+       /* TODO: setup speed? */
+       ar71xx_spi_wr(sp, SPI_REG_CTRL, 0x43);
+}
+
+static void ar71xx_spi_restore_regs(struct spi_device *spi)
+{
+       struct ar71xx_spi *sp = spidev_to_sp(spi);
+
+       /* restore CTRL register */
+       ar71xx_spi_wr(sp, SPI_REG_CTRL, sp->reg_ctrl);
+       /* disable GPIO mode */
+       ar71xx_spi_wr(sp, SPI_REG_FS, 0);
+}
+
+static int ar71xx_spi_setup(struct spi_device *spi)
+{
+       int status;
+
+       if (spi->bits_per_word > 32)
+               return -EINVAL;
+
+       if (!spi->controller_state)
+               ar71xx_spi_setup_regs(spi);
+
+       status = spi_bitbang_setup(spi);
+       if (status && !spi->controller_state)
+               ar71xx_spi_restore_regs(spi);
+
+       return status;
+}
+
+static void ar71xx_spi_cleanup(struct spi_device *spi)
+{
+       ar71xx_spi_restore_regs(spi);
+       spi_bitbang_cleanup(spi);
+}
+
 static u32 ar71xx_spi_txrx_mode0(struct spi_device *spi, unsigned nsecs,
                                        u32 word, u8 bits)
 {
@@ -157,9 +198,13 @@ static int ar71xx_spi_probe(struct platform_device *pdev)
 
        pdata = pdev->dev.platform_data;
 
+       master->setup = ar71xx_spi_setup;
+       master->cleanup = ar71xx_spi_cleanup;
+
        sp->bitbang.master = spi_master_get(master);
        sp->bitbang.chipselect = ar71xx_spi_chipselect;
        sp->bitbang.txrx_word[SPI_MODE_0] = ar71xx_spi_txrx_mode0;
+       sp->bitbang.setup_transfer = spi_bitbang_setup_transfer;
 
        sp->get_ioc_base = ar71xx_spi_get_ioc_base;
        if (pdata) {
@@ -184,8 +229,6 @@ static int ar71xx_spi_probe(struct platform_device *pdev)
                goto err1;
        }
 
-       sp->reg_ctrl = ar71xx_spi_rr(sp, SPI_REG_CTRL);
-
        ret = spi_bitbang_start(&sp->bitbang);
        if (!ret)
                return 0;