diff options
Diffstat (limited to 'drivers/spi/spi_s3c24xx.c')
| -rw-r--r-- | drivers/spi/spi_s3c24xx.c | 444 |
1 files changed, 0 insertions, 444 deletions
diff --git a/drivers/spi/spi_s3c24xx.c b/drivers/spi/spi_s3c24xx.c deleted file mode 100644 index 6e834b8b9d2..00000000000 --- a/drivers/spi/spi_s3c24xx.c +++ /dev/null @@ -1,444 +0,0 @@ -/* linux/drivers/spi/spi_s3c24xx.c - * - * Copyright (c) 2006 Ben Dooks - * Copyright (c) 2006 Simtec Electronics - * Ben Dooks <ben@simtec.co.uk> - * - * 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/init.h> -#include <linux/spinlock.h> -#include <linux/workqueue.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/errno.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/platform_device.h> - -#include <linux/spi/spi.h> -#include <linux/spi/spi_bitbang.h> - -#include <asm/io.h> -#include <asm/dma.h> -#include <asm/hardware.h> - -#include <asm/arch/regs-gpio.h> -#include <asm/plat-s3c24xx/regs-spi.h> -#include <asm/arch/spi.h> - -struct s3c24xx_spi { - /* bitbang has to be first */ - struct spi_bitbang bitbang; - struct completion done; - - void __iomem *regs; - int irq; - int len; - int count; - - void (*set_cs)(struct s3c2410_spi_info *spi, - int cs, int pol); - - /* data buffers */ - const unsigned char *tx; - unsigned char *rx; - - struct clk *clk; - struct resource *ioarea; - struct spi_master *master; - struct spi_device *curdev; - struct device *dev; - struct s3c2410_spi_info *pdata; -}; - -#define SPCON_DEFAULT (S3C2410_SPCON_MSTR | S3C2410_SPCON_SMOD_INT) -#define SPPIN_DEFAULT (S3C2410_SPPIN_KEEP) - -static inline struct s3c24xx_spi *to_hw(struct spi_device *sdev) -{ - return spi_master_get_devdata(sdev->master); -} - -static void s3c24xx_spi_gpiocs(struct s3c2410_spi_info *spi, int cs, int pol) -{ - s3c2410_gpio_setpin(spi->pin_cs, pol); -} - -static void s3c24xx_spi_chipsel(struct spi_device *spi, int value) -{ - struct s3c24xx_spi *hw = to_hw(spi); - unsigned int cspol = spi->mode & SPI_CS_HIGH ? 1 : 0; - unsigned int spcon; - - switch (value) { - case BITBANG_CS_INACTIVE: - hw->set_cs(hw->pdata, spi->chip_select, cspol^1); - break; - - case BITBANG_CS_ACTIVE: - spcon = readb(hw->regs + S3C2410_SPCON); - - if (spi->mode & SPI_CPHA) - spcon |= S3C2410_SPCON_CPHA_FMTB; - else - spcon &= ~S3C2410_SPCON_CPHA_FMTB; - - if (spi->mode & SPI_CPOL) - spcon |= S3C2410_SPCON_CPOL_HIGH; - else - spcon &= ~S3C2410_SPCON_CPOL_HIGH; - - spcon |= S3C2410_SPCON_ENSCK; - - /* write new configration */ - - writeb(spcon, hw->regs + S3C2410_SPCON); - hw->set_cs(hw->pdata, spi->chip_select, cspol); - - break; - } -} - -static int s3c24xx_spi_setupxfer(struct spi_device *spi, - struct spi_transfer *t) -{ - struct s3c24xx_spi *hw = to_hw(spi); - unsigned int bpw; - unsigned int hz; - unsigned int div; - - bpw = t ? t->bits_per_word : spi->bits_per_word; - hz = t ? t->speed_hz : spi->max_speed_hz; - - if (bpw != 8) { - dev_err(&spi->dev, "invalid bits-per-word (%d)\n", bpw); - return -EINVAL; - } - - div = clk_get_rate(hw->clk) / hz; - - /* is clk = pclk / (2 * (pre+1)), or is it - * clk = (pclk * 2) / ( pre + 1) */ - - div = (div / 2) - 1; - - if (div < 0) - div = 1; - - if (div > 255) - div = 255; - - dev_dbg(&spi->dev, "setting pre-scaler to %d (hz %d)\n", div, hz); - writeb(div, hw->regs + S3C2410_SPPRE); - - spin_lock(&hw->bitbang.lock); - if (!hw->bitbang.busy) { - hw->bitbang.chipselect(spi, BITBANG_CS_INACTIVE); - /* need to ndelay for 0.5 clocktick ? */ - } - spin_unlock(&hw->bitbang.lock); - - return 0; -} - -/* the spi->mode bits understood by this driver: */ -#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH) - -static int s3c24xx_spi_setup(struct spi_device *spi) -{ - int ret; - - if (!spi->bits_per_word) - spi->bits_per_word = 8; - - if (spi->mode & ~MODEBITS) { - dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n", - spi->mode & ~MODEBITS); - return -EINVAL; - } - - ret = s3c24xx_spi_setupxfer(spi, NULL); - if (ret < 0) { - dev_err(&spi->dev, "setupxfer returned %d\n", ret); - return ret; - } - - dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", - __FUNCTION__, spi->mode, spi->bits_per_word, - spi->max_speed_hz); - - return 0; -} - -static inline unsigned int hw_txbyte(struct s3c24xx_spi *hw, int count) -{ - return hw->tx ? hw->tx[count] : 0; -} - -static int s3c24xx_spi_txrx(struct spi_device *spi, struct spi_transfer *t) -{ - struct s3c24xx_spi *hw = to_hw(spi); - - dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", - t->tx_buf, t->rx_buf, t->len); - - hw->tx = t->tx_buf; - hw->rx = t->rx_buf; - hw->len = t->len; - hw->count = 0; - - /* send the first byte */ - writeb(hw_txbyte(hw, 0), hw->regs + S3C2410_SPTDAT); - wait_for_completion(&hw->done); - - return hw->count; -} - -static irqreturn_t s3c24xx_spi_irq(int irq, void *dev) -{ - struct s3c24xx_spi *hw = dev; - unsigned int spsta = readb(hw->regs + S3C2410_SPSTA); - unsigned int count = hw->count; - - if (spsta & S3C2410_SPSTA_DCOL) { - dev_dbg(hw->dev, "data-collision\n"); - complete(&hw->done); - goto irq_done; - } - - if (!(spsta & S3C2410_SPSTA_READY)) { - dev_dbg(hw->dev, "spi not ready for tx?\n"); - complete(&hw->done); - goto irq_done; - } - - hw->count++; - - if (hw->rx) - hw->rx[count] = readb(hw->regs + S3C2410_SPRDAT); - - count++; - - if (count < hw->len) - writeb(hw_txbyte(hw, count), hw->regs + S3C2410_SPTDAT); - else - complete(&hw->done); - - irq_done: - return IRQ_HANDLED; -} - -static int __init s3c24xx_spi_probe(struct platform_device *pdev) -{ - struct s3c24xx_spi *hw; - struct spi_master *master; - struct resource *res; - int err = 0; - - master = spi_alloc_master(&pdev->dev, sizeof(struct s3c24xx_spi)); - if (master == NULL) { - dev_err(&pdev->dev, "No memory for spi_master\n"); - err = -ENOMEM; - goto err_nomem; - } - - hw = spi_master_get_devdata(master); - memset(hw, 0, sizeof(struct s3c24xx_spi)); - - hw->master = spi_master_get(master); - hw->pdata = pdev->dev.platform_data; - hw->dev = &pdev->dev; - - if (hw->pdata == NULL) { - dev_err(&pdev->dev, "No platform data supplied\n"); - err = -ENOENT; - goto err_no_pdata; - } - - platform_set_drvdata(pdev, hw); - init_completion(&hw->done); - - /* setup the state for the bitbang driver */ - - hw->bitbang.master = hw->master; - hw->bitbang.setup_transfer = s3c24xx_spi_setupxfer; - hw->bitbang.chipselect = s3c24xx_spi_chipsel; - hw->bitbang.txrx_bufs = s3c24xx_spi_txrx; - hw->bitbang.master->setup = s3c24xx_spi_setup; - - dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang); - - /* find and map our resources */ - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res == NULL) { - dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n"); - err = -ENOENT; - goto err_no_iores; - } - - hw->ioarea = request_mem_region(res->start, (res->end - res->start)+1, - pdev->name); - - if (hw->ioarea == NULL) { - dev_err(&pdev->dev, "Cannot reserve region\n"); - err = -ENXIO; - goto err_no_iores; - } - - hw->regs = ioremap(res->start, (res->end - res->start)+1); - if (hw->regs == NULL) { - dev_err(&pdev->dev, "Cannot map IO\n"); - err = -ENXIO; - goto err_no_iomap; - } - - hw->irq = platform_get_irq(pdev, 0); - if (hw->irq < 0) { - dev_err(&pdev->dev, "No IRQ specified\n"); - err = -ENOENT; - goto err_no_irq; - } - - err = request_irq(hw->irq, s3c24xx_spi_irq, 0, pdev->name, hw); - if (err) { - dev_err(&pdev->dev, "Cannot claim IRQ\n"); - goto err_no_irq; - } - - hw->clk = clk_get(&pdev->dev, "spi"); - if (IS_ERR(hw->clk)) { - dev_err(&pdev->dev, "No clock for device\n"); - err = PTR_ERR(hw->clk); - goto err_no_clk; - } - - /* for the moment, permanently enable the clock */ - - clk_enable(hw->clk); - - /* program defaults into the registers */ - - writeb(0xff, hw->regs + S3C2410_SPPRE); - writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN); - writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON); - - /* setup any gpio we can */ - - if (!hw->pdata->set_cs) { - hw->set_cs = s3c24xx_spi_gpiocs; - - s3c2410_gpio_setpin(hw->pdata->pin_cs, 1); - s3c2410_gpio_cfgpin(hw->pdata->pin_cs, S3C2410_GPIO_OUTPUT); - } else - hw->set_cs = hw->pdata->set_cs; - - /* register our spi controller */ - - err = spi_bitbang_start(&hw->bitbang); - if (err) { - dev_err(&pdev->dev, "Failed to register SPI master\n"); - goto err_register; - } - - return 0; - - err_register: - clk_disable(hw->clk); - clk_put(hw->clk); - - err_no_clk: - free_irq(hw->irq, hw); - - err_no_irq: - iounmap(hw->regs); - - err_no_iomap: - release_resource(hw->ioarea); - kfree(hw->ioarea); - - err_no_iores: - err_no_pdata: - spi_master_put(hw->master);; - - err_nomem: - return err; -} - -static int __exit s3c24xx_spi_remove(struct platform_device *dev) -{ - struct s3c24xx_spi *hw = platform_get_drvdata(dev); - - platform_set_drvdata(dev, NULL); - - spi_unregister_master(hw->master); - - clk_disable(hw->clk); - clk_put(hw->clk); - - free_irq(hw->irq, hw); - iounmap(hw->regs); - - release_resource(hw->ioarea); - kfree(hw->ioarea); - - spi_master_put(hw->master); - return 0; -} - - -#ifdef CONFIG_PM - -static int s3c24xx_spi_suspend(struct platform_device *pdev, pm_message_t msg) -{ - struct s3c24xx_spi *hw = platform_get_drvdata(pdev); - - clk_disable(hw->clk); - return 0; -} - -static int s3c24xx_spi_resume(struct platform_device *pdev) -{ - struct s3c24xx_spi *hw = platform_get_drvdata(pdev); - - clk_enable(hw->clk); - return 0; -} - -#else -#define s3c24xx_spi_suspend NULL -#define s3c24xx_spi_resume NULL -#endif - -MODULE_ALIAS("s3c2410_spi"); /* for platform bus hotplug */ -static struct platform_driver s3c24xx_spidrv = { - .remove = __exit_p(s3c24xx_spi_remove), - .suspend = s3c24xx_spi_suspend, - .resume = s3c24xx_spi_resume, - .driver = { - .name = "s3c2410-spi", - .owner = THIS_MODULE, - }, -}; - -static int __init s3c24xx_spi_init(void) -{ - return platform_driver_probe(&s3c24xx_spidrv, s3c24xx_spi_probe); -} - -static void __exit s3c24xx_spi_exit(void) -{ - platform_driver_unregister(&s3c24xx_spidrv); -} - -module_init(s3c24xx_spi_init); -module_exit(s3c24xx_spi_exit); - -MODULE_DESCRIPTION("S3C24XX SPI Driver"); -MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); -MODULE_LICENSE("GPL"); |