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[ar71xx] update ar71xx_spi driver

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17143 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
juhosg 2009-08-06 10:56:48 +00:00
parent 966e94d341
commit 20c131d983
1 changed files with 54 additions and 11 deletions
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65
target/linux/ar71xx/files/drivers/spi/ar71xx_spi.c
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@ -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);