*
*/
-
-//#define DEBUG
-
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
+#include <linux/gpio.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 <mach/hardware.h>
-#include <asm/arch/regs-gpio.h>
-#include <asm/arch/regs-spi.h>
-#include <asm/arch/spi.h>
+#include <plat/regs-spi.h>
+#include <mach/spi.h>
struct s3c24xx_spi {
/* bitbang has to be first */
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;
return spi_master_get_devdata(sdev->master);
}
+static void s3c24xx_spi_gpiocs(struct s3c2410_spi_info *spi, int cs, int pol)
+{
+ gpio_set_value(spi->pin_cs, pol);
+}
+
static void s3c24xx_spi_chipsel(struct spi_device *spi, int value)
{
struct s3c24xx_spi *hw = to_hw(spi);
switch (value) {
case BITBANG_CS_INACTIVE:
- if (hw->pdata->set_cs)
- hw->pdata->set_cs(hw->pdata, value, cspol);
- else
- s3c2410_gpio_setpin(hw->pdata->pin_cs, cspol ^ 1);
+ hw->set_cs(hw->pdata, spi->chip_select, cspol^1);
break;
case BITBANG_CS_ACTIVE:
/* write new configration */
writeb(spcon, hw->regs + S3C2410_SPCON);
-
- if (hw->pdata->set_cs)
- hw->pdata->set_cs(hw->pdata, value, cspol);
- else
- s3c2410_gpio_setpin(hw->pdata->pin_cs, cspol);
+ hw->set_cs(hw->pdata, spi->chip_select, cspol);
break;
-
}
}
/* is clk = pclk / (2 * (pre+1)), or is it
* clk = (pclk * 2) / ( pre + 1) */
- div = (div / 2) - 1;
+ div /= 2;
- if (div < 0)
- div = 1;
+ if (div > 0)
+ div -= 1;
if (div > 255)
div = 255;
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 & SPI_LSB_FIRST) != 0)
+ 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_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n",
- __FUNCTION__, spi->mode, spi->bits_per_word,
+ __func__, 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] : 0xff;
+ return hw->tx ? hw->tx[count] : 0;
}
static int s3c24xx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
hw->len = t->len;
hw->count = 0;
+ init_completion(&hw->done);
+
/* send the first byte */
writeb(hw_txbyte(hw, 0), hw->regs + S3C2410_SPTDAT);
+
wait_for_completion(&hw->done);
return hw->count;
return IRQ_HANDLED;
}
-static int s3c24xx_spi_probe(struct platform_device *pdev)
+static void s3c24xx_spi_initialsetup(struct s3c24xx_spi *hw)
+{
+ /* 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);
+
+ if (hw->pdata) {
+ if (hw->set_cs == s3c24xx_spi_gpiocs)
+ gpio_direction_output(hw->pdata->pin_cs, 1);
+
+ if (hw->pdata->gpio_setup)
+ hw->pdata->gpio_setup(hw->pdata, 1);
+ }
+}
+
+static int __init s3c24xx_spi_probe(struct platform_device *pdev)
{
+ struct s3c2410_spi_info *pdata;
struct s3c24xx_spi *hw;
struct spi_master *master;
- struct spi_board_info *bi;
struct resource *res;
int err = 0;
- int i;
master = spi_alloc_master(&pdev->dev, sizeof(struct s3c24xx_spi));
if (master == NULL) {
memset(hw, 0, sizeof(struct s3c24xx_spi));
hw->master = spi_master_get(master);
- hw->pdata = pdev->dev.platform_data;
+ hw->pdata = pdata = pdev->dev.platform_data;
hw->dev = &pdev->dev;
- if (hw->pdata == NULL) {
+ if (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 master state. */
+
+ master->num_chipselect = hw->pdata->num_cs;
+ master->bus_num = pdata->bus_num;
+
/* setup the state for the bitbang driver */
hw->bitbang.master = hw->master;
goto err_no_clk;
}
- /* for the moment, permanently enable the clock */
-
- clk_enable(hw->clk);
+ /* setup any gpio we can */
- /* program defaults into the registers */
+ if (!pdata->set_cs) {
+ if (pdata->pin_cs < 0) {
+ dev_err(&pdev->dev, "No chipselect pin\n");
+ goto err_register;
+ }
- writeb(0xff, hw->regs + S3C2410_SPPRE);
- writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN);
- writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON);
+ err = gpio_request(pdata->pin_cs, dev_name(&pdev->dev));
+ if (err) {
+ dev_err(&pdev->dev, "Failed to get gpio for cs\n");
+ goto err_register;
+ }
- /* setup any gpio we can */
+ hw->set_cs = s3c24xx_spi_gpiocs;
+ gpio_direction_output(pdata->pin_cs, 1);
+ } else
+ hw->set_cs = pdata->set_cs;
- if (!hw->pdata->set_cs) {
- s3c2410_gpio_setpin(hw->pdata->pin_cs, 1);
- s3c2410_gpio_cfgpin(hw->pdata->pin_cs, S3C2410_GPIO_OUTPUT);
- }
+ s3c24xx_spi_initialsetup(hw);
/* register our spi controller */
goto err_register;
}
- dev_dbg(hw->dev, "shutdown=%d\n", hw->bitbang.shutdown);
-
- /* register all the devices associated */
-
- bi = &hw->pdata->board_info[0];
- for (i = 0; i < hw->pdata->board_size; i++, bi++) {
- dev_info(hw->dev, "registering %s\n", bi->modalias);
-
- bi->controller_data = hw;
- spi_new_device(master, bi);
- }
-
return 0;
err_register:
+ if (hw->set_cs == s3c24xx_spi_gpiocs)
+ gpio_free(pdata->pin_cs);
+
clk_disable(hw->clk);
clk_put(hw->clk);
return err;
}
-static int s3c24xx_spi_remove(struct platform_device *dev)
+static int __exit s3c24xx_spi_remove(struct platform_device *dev)
{
struct s3c24xx_spi *hw = platform_get_drvdata(dev);
free_irq(hw->irq, hw);
iounmap(hw->regs);
+ if (hw->set_cs == s3c24xx_spi_gpiocs)
+ gpio_free(hw->pdata->pin_cs);
+
release_resource(hw->ioarea);
kfree(hw->ioarea);
{
struct s3c24xx_spi *hw = platform_get_drvdata(pdev);
+ if (hw->pdata && hw->pdata->gpio_setup)
+ hw->pdata->gpio_setup(hw->pdata, 0);
+
clk_disable(hw->clk);
return 0;
}
{
struct s3c24xx_spi *hw = platform_get_drvdata(pdev);
- clk_enable(hw->clk);
+ s3c24xx_spi_initialsetup(hw);
return 0;
}
#define s3c24xx_spi_resume NULL
#endif
-static struct platform_driver s3c24xx_spidrv = {
- .probe = s3c24xx_spi_probe,
- .remove = s3c24xx_spi_remove,
+MODULE_ALIAS("platform:s3c2410-spi");
+static struct platform_driver s3c24xx_spi_driver = {
+ .remove = __exit_p(s3c24xx_spi_remove),
.suspend = s3c24xx_spi_suspend,
.resume = s3c24xx_spi_resume,
.driver = {
static int __init s3c24xx_spi_init(void)
{
- return platform_driver_register(&s3c24xx_spidrv);
+ return platform_driver_probe(&s3c24xx_spi_driver, s3c24xx_spi_probe);
}
static void __exit s3c24xx_spi_exit(void)
{
- platform_driver_unregister(&s3c24xx_spidrv);
+ platform_driver_unregister(&s3c24xx_spi_driver);
}
module_init(s3c24xx_spi_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff