#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/plat-s3c24xx/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 */
static void s3c24xx_spi_gpiocs(struct s3c2410_spi_info *spi, int cs, int pol)
{
- s3c2410_gpio_setpin(spi->pin_cs, pol);
+ gpio_set_value(spi->pin_cs, pol);
}
static void s3c24xx_spi_chipsel(struct spi_device *spi, int value)
unsigned int bpw;
unsigned int hz;
unsigned int div;
+ unsigned long clk;
bpw = t ? t->bits_per_word : spi->bits_per_word;
hz = t ? t->speed_hz : spi->max_speed_hz;
+ if (!bpw)
+ bpw = 8;
+
+ if (!hz)
+ 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;
+ clk = clk_get_rate(hw->clk);
+ div = DIV_ROUND_UP(clk, hz * 2) - 1;
if (div > 255)
div = 255;
- dev_dbg(&spi->dev, "setting pre-scaler to %d (hz %d)\n", div, hz);
+ dev_dbg(&spi->dev, "setting pre-scaler to %d (wanted %d, got %ld)\n",
+ div, hz, clk / (2 * (div + 1)));
+
+
writeb(div, hw->regs + S3C2410_SPPRE);
spin_lock(&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;
}
return IRQ_HANDLED;
}
+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 resource *res;
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. */
+
+ /* the spi->mode bits understood by this driver: */
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
+
+ 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);
-
- /* program defaults into the registers */
+ /* setup any gpio we can */
- writeb(0xff, hw->regs + S3C2410_SPPRE);
- writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN);
- writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON);
+ if (!pdata->set_cs) {
+ if (pdata->pin_cs < 0) {
+ dev_err(&pdev->dev, "No chipselect pin\n");
+ goto err_register;
+ }
- /* setup any gpio we can */
+ 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;
+ }
- 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);
+ gpio_direction_output(pdata->pin_cs, 1);
} else
- hw->set_cs = hw->pdata->set_cs;
+ hw->set_cs = pdata->set_cs;
+
+ s3c24xx_spi_initialsetup(hw);
/* register our spi controller */
return 0;
err_register:
+ if (hw->set_cs == s3c24xx_spi_gpiocs)
+ gpio_free(pdata->pin_cs);
+
clk_disable(hw->clk);
clk_put(hw->clk);
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;
}
#endif
MODULE_ALIAS("platform:s3c2410-spi");
-static struct platform_driver s3c24xx_spidrv = {
+static struct platform_driver s3c24xx_spi_driver = {
.remove = __exit_p(s3c24xx_spi_remove),
.suspend = s3c24xx_spi_suspend,
.resume = s3c24xx_spi_resume,
static int __init s3c24xx_spi_init(void)
{
- return platform_driver_probe(&s3c24xx_spidrv, s3c24xx_spi_probe);
+ 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