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author | Gabor Juhos <juhosg@openwrt.org> | 2012-02-10 08:19:28 +0000 |
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committer | Gabor Juhos <juhosg@openwrt.org> | 2012-02-10 08:19:28 +0000 |
commit | 81b7aaefbe060d752ed49d41aef11f2184f699ce (patch) | |
tree | aa02c8c515e33a253994c53c464b711b2c615ee6 /target/linux/ar71xx/files-2.6.39/drivers/spi/pb44_spi.c | |
parent | 650d777f3d221fd69e21d2f7163ee318d408b748 (diff) | |
download | master-31e0f0ae-81b7aaefbe060d752ed49d41aef11f2184f699ce.tar.gz master-31e0f0ae-81b7aaefbe060d752ed49d41aef11f2184f699ce.tar.bz2 master-31e0f0ae-81b7aaefbe060d752ed49d41aef11f2184f699ce.zip |
ar71xx: nuke 2.6.39 support
SVN-Revision: 30404
Diffstat (limited to 'target/linux/ar71xx/files-2.6.39/drivers/spi/pb44_spi.c')
-rw-r--r-- | target/linux/ar71xx/files-2.6.39/drivers/spi/pb44_spi.c | 316 |
1 files changed, 0 insertions, 316 deletions
diff --git a/target/linux/ar71xx/files-2.6.39/drivers/spi/pb44_spi.c b/target/linux/ar71xx/files-2.6.39/drivers/spi/pb44_spi.c deleted file mode 100644 index 556c7717c8..0000000000 --- a/target/linux/ar71xx/files-2.6.39/drivers/spi/pb44_spi.c +++ /dev/null @@ -1,316 +0,0 @@ -/* - * Atheros PB44 board SPI controller driver - * - * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org> - * - * 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. - * - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <linux/spinlock.h> -#include <linux/workqueue.h> -#include <linux/platform_device.h> -#include <linux/io.h> -#include <linux/spi/spi.h> -#include <linux/spi/spi_bitbang.h> -#include <linux/bitops.h> -#include <linux/gpio.h> - -#include <asm/mach-ar71xx/ar71xx.h> -#include <asm/mach-ar71xx/platform.h> - -#define DRV_DESC "Atheros PB44 SPI Controller driver" -#define DRV_VERSION "0.1.0" -#define DRV_NAME "pb44-spi" - -#undef PER_BIT_READ - -struct ar71xx_spi { - struct spi_bitbang bitbang; - u32 ioc_base; - u32 reg_ctrl; - - void __iomem *base; - - struct platform_device *pdev; -}; - -static inline u32 pb44_spi_rr(struct ar71xx_spi *sp, unsigned reg) -{ - return __raw_readl(sp->base + reg); -} - -static inline void pb44_spi_wr(struct ar71xx_spi *sp, unsigned reg, u32 val) -{ - __raw_writel(val, sp->base + reg); -} - -static inline struct ar71xx_spi *spidev_to_sp(struct spi_device *spi) -{ - return spi_master_get_devdata(spi->master); -} - -static void pb44_spi_chipselect(struct spi_device *spi, int is_active) -{ - struct ar71xx_spi *sp = spidev_to_sp(spi); - int cs_high = (spi->mode & SPI_CS_HIGH) ? is_active : !is_active; - - if (is_active) { - /* set initial clock polarity */ - if (spi->mode & SPI_CPOL) - sp->ioc_base |= SPI_IOC_CLK; - else - sp->ioc_base &= ~SPI_IOC_CLK; - - pb44_spi_wr(sp, SPI_REG_IOC, sp->ioc_base); - } - - if (spi->chip_select) { - unsigned long gpio = (unsigned long) spi->controller_data; - - /* SPI is normally active-low */ - gpio_set_value(gpio, cs_high); - } else { - if (cs_high) - sp->ioc_base |= SPI_IOC_CS0; - else - sp->ioc_base &= ~SPI_IOC_CS0; - - pb44_spi_wr(sp, SPI_REG_IOC, sp->ioc_base); - } - -} - -static void pb44_spi_enable(struct ar71xx_spi *sp) -{ - /* enable GPIO mode */ - pb44_spi_wr(sp, SPI_REG_FS, SPI_FS_GPIO); - - /* save CTRL register */ - sp->reg_ctrl = pb44_spi_rr(sp, SPI_REG_CTRL); - sp->ioc_base = pb44_spi_rr(sp, SPI_REG_IOC); - - pb44_spi_wr(sp, SPI_REG_CTRL, 0x43); -} - -static void pb44_spi_disable(struct ar71xx_spi *sp) -{ - /* restore CTRL register */ - pb44_spi_wr(sp, SPI_REG_CTRL, sp->reg_ctrl); - /* disable GPIO mode */ - pb44_spi_wr(sp, SPI_REG_FS, 0); -} - -static int pb44_spi_setup_cs(struct spi_device *spi) -{ - struct ar71xx_spi *sp = spidev_to_sp(spi); - - if (spi->chip_select) { - unsigned long gpio = (unsigned long) spi->controller_data; - int status = 0; - - status = gpio_request(gpio, dev_name(&spi->dev)); - if (status) - return status; - - status = gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH); - if (status) { - gpio_free(gpio); - return status; - } - } else { - if (spi->mode & SPI_CS_HIGH) - sp->ioc_base |= SPI_IOC_CS0; - else - sp->ioc_base &= ~SPI_IOC_CS0; - pb44_spi_wr(sp, SPI_REG_IOC, sp->ioc_base); - } - - return 0; -} - -static void pb44_spi_cleanup_cs(struct spi_device *spi) -{ - if (spi->chip_select) { - unsigned long gpio = (unsigned long) spi->controller_data; - gpio_free(gpio); - } -} - -static int pb44_spi_setup(struct spi_device *spi) -{ - int status = 0; - - if (spi->bits_per_word > 32) - return -EINVAL; - - if (!spi->controller_state) { - status = pb44_spi_setup_cs(spi); - if (status) - return status; - } - - status = spi_bitbang_setup(spi); - if (status && !spi->controller_state) - pb44_spi_cleanup_cs(spi); - - return status; -} - -static void pb44_spi_cleanup(struct spi_device *spi) -{ - pb44_spi_cleanup_cs(spi); - spi_bitbang_cleanup(spi); -} - -static u32 pb44_spi_txrx_mode0(struct spi_device *spi, unsigned nsecs, - u32 word, u8 bits) -{ - struct ar71xx_spi *sp = spidev_to_sp(spi); - u32 ioc = sp->ioc_base; - u32 ret; - - /* clock starts at inactive polarity */ - for (word <<= (32 - bits); likely(bits); bits--) { - u32 out; - - if (word & (1 << 31)) - out = ioc | SPI_IOC_DO; - else - out = ioc & ~SPI_IOC_DO; - - /* setup MSB (to slave) on trailing edge */ - pb44_spi_wr(sp, SPI_REG_IOC, out); - pb44_spi_wr(sp, SPI_REG_IOC, out | SPI_IOC_CLK); - - word <<= 1; - -#ifdef PER_BIT_READ - /* sample MSB (from slave) on leading edge */ - ret = pb44_spi_rr(sp, SPI_REG_RDS); - pb44_spi_wr(sp, SPI_REG_IOC, out); -#endif - } - -#ifndef PER_BIT_READ - ret = pb44_spi_rr(sp, SPI_REG_RDS); -#endif - return ret; -} - -static int pb44_spi_probe(struct platform_device *pdev) -{ - struct spi_master *master; - struct ar71xx_spi *sp; - struct ar71xx_spi_platform_data *pdata; - struct resource *r; - int ret; - - master = spi_alloc_master(&pdev->dev, sizeof(*sp)); - if (master == NULL) { - dev_err(&pdev->dev, "failed to allocate spi master\n"); - return -ENOMEM; - } - - sp = spi_master_get_devdata(master); - platform_set_drvdata(pdev, sp); - - pdata = pdev->dev.platform_data; - - master->setup = pb44_spi_setup; - master->cleanup = pb44_spi_cleanup; - if (pdata) { - master->bus_num = pdata->bus_num; - master->num_chipselect = pdata->num_chipselect; - } else { - master->bus_num = 0; - master->num_chipselect = 1; - } - - sp->bitbang.master = spi_master_get(master); - sp->bitbang.chipselect = pb44_spi_chipselect; - sp->bitbang.txrx_word[SPI_MODE_0] = pb44_spi_txrx_mode0; - sp->bitbang.setup_transfer = spi_bitbang_setup_transfer; - sp->bitbang.flags = SPI_CS_HIGH; - - r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (r == NULL) { - ret = -ENOENT; - goto err1; - } - - sp->base = ioremap_nocache(r->start, r->end - r->start + 1); - if (!sp->base) { - ret = -ENXIO; - goto err1; - } - - pb44_spi_enable(sp); - - ret = spi_bitbang_start(&sp->bitbang); - if (!ret) - return 0; - - pb44_spi_disable(sp); - iounmap(sp->base); -err1: - platform_set_drvdata(pdev, NULL); - spi_master_put(sp->bitbang.master); - - return ret; -} - -static int pb44_spi_remove(struct platform_device *pdev) -{ - struct ar71xx_spi *sp = platform_get_drvdata(pdev); - - spi_bitbang_stop(&sp->bitbang); - pb44_spi_disable(sp); - iounmap(sp->base); - platform_set_drvdata(pdev, NULL); - spi_master_put(sp->bitbang.master); - - return 0; -} - -static void pb44_spi_shutdown(struct platform_device *pdev) -{ - int ret; - - ret = pb44_spi_remove(pdev); - if (ret) - dev_err(&pdev->dev, "shutdown failed with %d\n", ret); -} - -static struct platform_driver pb44_spi_drv = { - .probe = pb44_spi_probe, - .remove = pb44_spi_remove, - .shutdown = pb44_spi_shutdown, - .driver = { - .name = DRV_NAME, - .owner = THIS_MODULE, - }, -}; - -static int __init pb44_spi_init(void) -{ - return platform_driver_register(&pb44_spi_drv); -} -module_init(pb44_spi_init); - -static void __exit pb44_spi_exit(void) -{ - platform_driver_unregister(&pb44_spi_drv); -} -module_exit(pb44_spi_exit); - -MODULE_ALIAS("platform:" DRV_NAME); -MODULE_DESCRIPTION(DRV_DESC); -MODULE_VERSION(DRV_VERSION); -MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); -MODULE_LICENSE("GPL v2"); |