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path: root/target/linux/ar71xx/files-2.6.39/drivers/spi/ar71xx_spi.c
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Diffstat (limited to 'target/linux/ar71xx/files-2.6.39/drivers/spi/ar71xx_spi.c')
-rw-r--r--target/linux/ar71xx/files-2.6.39/drivers/spi/ar71xx_spi.c283
1 files changed, 0 insertions, 283 deletions
diff --git a/target/linux/ar71xx/files-2.6.39/drivers/spi/ar71xx_spi.c b/target/linux/ar71xx/files-2.6.39/drivers/spi/ar71xx_spi.c
deleted file mode 100644
index d1ed731c14..0000000000
--- a/target/linux/ar71xx/files-2.6.39/drivers/spi/ar71xx_spi.c
+++ /dev/null
@@ -1,283 +0,0 @@
-/*
- * Atheros AR71xx SPI Controller driver
- *
- * 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
- * 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 <asm/mach-ar71xx/ar71xx.h>
-#include <asm/mach-ar71xx/platform.h>
-
-#define DRV_DESC "Atheros AR71xx SPI Controller driver"
-#define DRV_VERSION "0.2.4"
-#define DRV_NAME "ar71xx-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;
- u32 (*get_ioc_base)(u8 chip_select, int cs_high,
- int is_on);
-};
-
-static inline u32 ar71xx_spi_rr(struct ar71xx_spi *sp, unsigned reg)
-{
- return __raw_readl(sp->base + reg);
-}
-
-static inline void ar71xx_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 u32 ar71xx_spi_get_ioc_base(u8 chip_select, int cs_high, int is_on)
-{
- u32 ret;
-
- if (is_on == AR71XX_SPI_CS_INACTIVE)
- ret = SPI_IOC_CS_ALL;
- else
- ret = SPI_IOC_CS_ALL & ~SPI_IOC_CS(chip_select);
-
- return ret;
-}
-
-static void ar71xx_spi_chipselect(struct spi_device *spi, int value)
-{
- struct ar71xx_spi *sp = spidev_to_sp(spi);
- void __iomem *base = sp->base;
- u32 ioc_base;
-
- switch (value) {
- case BITBANG_CS_INACTIVE:
- 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);
- break;
-
- case BITBANG_CS_ACTIVE:
- ioc_base = sp->get_ioc_base(spi->chip_select,
- (spi->mode & SPI_CS_HIGH) != 0,
- AR71XX_SPI_CS_ACTIVE);
-
- __raw_writel(ioc_base, base + SPI_REG_IOC);
- sp->ioc_base = ioc_base;
- break;
- }
-}
-
-static void ar71xx_spi_setup_regs(struct ar71xx_spi *sp)
-{
- /* 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 ar71xx_spi *sp)
-{
- /* 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)
-{
- if (spi->bits_per_word > 32)
- return -EINVAL;
-
- return spi_bitbang_setup(spi);
-}
-
-static void ar71xx_spi_cleanup(struct spi_device *spi)
-{
- spi_bitbang_cleanup(spi);
-}
-
-static u32 ar71xx_spi_txrx_mode0(struct spi_device *spi, unsigned nsecs,
- u32 word, u8 bits)
-{
- struct ar71xx_spi *sp = spidev_to_sp(spi);
- void __iomem *base = sp->base;
- 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 */
- __raw_writel(out, base + SPI_REG_IOC);
-
- __raw_writel(out | SPI_IOC_CLK, base + SPI_REG_IOC);
-
- word <<= 1;
-
-#ifdef PER_BIT_READ
- /* sample MSB (from slave) on leading edge */
- ret = __raw_readl(base + SPI_REG_RDS);
- __raw_writel(out, base + SPI_REG_IOC);
-#endif
-
- }
-
-#ifndef PER_BIT_READ
- ret = __raw_readl(base + SPI_REG_RDS);
-#endif
- return ret;
-}
-
-static int ar71xx_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 = 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) {
- sp->bitbang.master->bus_num = pdata->bus_num;
- sp->bitbang.master->num_chipselect = pdata->num_chipselect;
- if (pdata->get_ioc_base)
- sp->get_ioc_base = pdata->get_ioc_base;
- } else {
- sp->bitbang.master->bus_num = 0;
- sp->bitbang.master->num_chipselect = 3;
- }
-
- 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;
- }
-
- ar71xx_spi_setup_regs(sp);
-
- ret = spi_bitbang_start(&sp->bitbang);
- if (!ret)
- return 0;
-
- ar71xx_spi_restore_regs(sp);
- iounmap(sp->base);
-err1:
- platform_set_drvdata(pdev, NULL);
- spi_master_put(sp->bitbang.master);
-
- return ret;
-}
-
-static int ar71xx_spi_remove(struct platform_device *pdev)
-{
- struct ar71xx_spi *sp = platform_get_drvdata(pdev);
-
- spi_bitbang_stop(&sp->bitbang);
- ar71xx_spi_restore_regs(sp);
- iounmap(sp->base);
- platform_set_drvdata(pdev, NULL);
- spi_master_put(sp->bitbang.master);
-
- return 0;
-}
-
-static void ar71xx_spi_shutdown(struct platform_device *pdev)
-{
- int ret;
-
- ret = ar71xx_spi_remove(pdev);
- if (ret)
- dev_err(&pdev->dev, "shutdown failed with %d\n", ret);
-}
-
-static struct platform_driver ar71xx_spi_drv = {
- .probe = ar71xx_spi_probe,
- .remove = ar71xx_spi_remove,
- .shutdown = ar71xx_spi_shutdown,
- .driver = {
- .name = DRV_NAME,
- .owner = THIS_MODULE,
- },
-};
-
-static int __init ar71xx_spi_init(void)
-{
- printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
- return platform_driver_register(&ar71xx_spi_drv);
-}
-module_init(ar71xx_spi_init);
-
-static void __exit ar71xx_spi_exit(void)
-{
- platform_driver_unregister(&ar71xx_spi_drv);
-}
-module_exit(ar71xx_spi_exit);
-
-MODULE_ALIAS("platform:" DRV_NAME);
-MODULE_DESCRIPTION(DRV_DESC);
-MODULE_VERSION(DRV_VERSION);
-MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
-MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org>");
-MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.46.0) at 2024-12-25 07:19:52 +0000