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authorGabor Juhos <juhosg@openwrt.org>2009-08-06 10:56:48 +0000
committerGabor Juhos <juhosg@openwrt.org>2009-08-06 10:56:48 +0000
commitc23ddf2d27d35c07dbd1fe43fe91f6b86884fd82 (patch)
treef9e793855508262489bced23fddd824da099657e /target/linux/ar71xx
parent66f839ac67e1449c693059a2bdc4fc20a2a27e8f (diff)
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update ar71xx_spi driver
SVN-Revision: 17143
Diffstat (limited to 'target/linux/ar71xx')
-rw-r--r--target/linux/ar71xx/files/drivers/spi/ar71xx_spi.c65
1 files changed, 54 insertions, 11 deletions
diff --git a/target/linux/ar71xx/files/drivers/spi/ar71xx_spi.c b/target/linux/ar71xx/files/drivers/spi/ar71xx_spi.c
index 654a0c8..ac60170 100644
--- 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
@@ -25,7 +25,7 @@
#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
@@ -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) {
@@ -184,14 +229,12 @@ 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;
iounmap(sp->base);
-err1:
+ err1:
platform_set_drvdata(pdev, NULL);
spi_master_put(sp->bitbang.master);