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Merge remote-tracking branch 'spi/topic/s3c64xx' into spi-loop

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This commit is contained in:
Mark Brown 2013-10-11 20:10:13 +01:00
commit 2cc6e2e0c8
5 changed files with 98 additions and 50 deletions
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3
Documentation/driver-model/devres.txt
View File

@ -302,3 +302,6 @@ PHY
SLAVE DMA ENGINE
devm_acpi_dma_controller_register()
SPI
devm_spi_register_master()

2
drivers/spi/Kconfig
View File

@ -393,7 +393,7 @@ config SPI_S3C24XX_FIQ
config SPI_S3C64XX
tristate "Samsung S3C64XX series type SPI"
depends on (ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5P64X0 || ARCH_EXYNOS)
depends on PLAT_SAMSUNG
select S3C64XX_DMA if ARCH_S3C64XX
help
SPI driver for Samsung S3C64XX and newer SoCs.

106
drivers/spi/spi-s3c64xx.c
View File

@ -205,7 +205,6 @@ struct s3c64xx_spi_driver_data {
#endif
struct s3c64xx_spi_port_config *port_conf;
unsigned int port_id;
unsigned long gpios[4];
bool cs_gpio;
};
@ -559,25 +558,18 @@ static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd,
struct spi_device *spi)
{
struct s3c64xx_spi_csinfo *cs;
if (sdd->tgl_spi != NULL) { /* If last device toggled after mssg */
if (sdd->tgl_spi != spi) { /* if last mssg on diff device */
/* Deselect the last toggled device */
cs = sdd->tgl_spi->controller_data;
if (sdd->cs_gpio)
gpio_set_value(cs->line,
if (spi->cs_gpio >= 0)
gpio_set_value(spi->cs_gpio,
spi->mode & SPI_CS_HIGH ? 0 : 1);
}
sdd->tgl_spi = NULL;
}
cs = spi->controller_data;
if (sdd->cs_gpio)
gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0);
/* Start the signals */
writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
if (spi->cs_gpio >= 0)
gpio_set_value(spi->cs_gpio, spi->mode & SPI_CS_HIGH ? 1 : 0);
}
static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd,
@ -702,16 +694,11 @@ static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd,
static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd,
struct spi_device *spi)
{
struct s3c64xx_spi_csinfo *cs = spi->controller_data;
if (sdd->tgl_spi == spi)
sdd->tgl_spi = NULL;
if (sdd->cs_gpio)
gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1);
/* Quiese the signals */
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
if (spi->cs_gpio >= 0)
gpio_set_value(spi->cs_gpio, spi->mode & SPI_CS_HIGH ? 0 : 1);
}
static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
@ -927,6 +914,9 @@ static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
s3c64xx_spi_config(sdd);
}
/* Slave Select */
enable_cs(sdd, spi);
/* Polling method for xfers not bigger than FIFO capacity */
use_dma = 0;
if (!is_polling(sdd) &&
@ -942,8 +932,11 @@ static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
enable_datapath(sdd, spi, xfer, use_dma);
/* Slave Select */
enable_cs(sdd, spi);
/* Start the signals */
writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
/* Start the signals */
writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
spin_unlock_irqrestore(&sdd->lock, flags);
@ -968,6 +961,8 @@ static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
goto out;
}
flush_fifo(sdd);
if (xfer->delay_usecs)
udelay(xfer->delay_usecs);
@ -980,15 +975,17 @@ static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
}
msg->actual_length += xfer->len;
flush_fifo(sdd);
}
out:
if (!cs_toggle || status)
if (!cs_toggle || status) {
/* Quiese the signals */
writel(S3C64XX_SPI_SLAVE_SIG_INACT,
sdd->regs + S3C64XX_SPI_SLAVE_SEL);
disable_cs(sdd, spi);
else
} else {
sdd->tgl_spi = spi;
}
s3c64xx_spi_unmap_mssg(sdd, msg);
@ -1089,6 +1086,8 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
cs->line, err);
goto err_gpio_req;
}
spi->cs_gpio = cs->line;
}
spi_set_ctldata(spi, cs);
@ -1135,11 +1134,13 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
}
pm_runtime_put(&sdd->pdev->dev);
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
disable_cs(sdd, spi);
return 0;
setup_exit:
/* setup() returns with device de-selected */
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
disable_cs(sdd, spi);
gpio_free(cs->line);
@ -1158,8 +1159,8 @@ static void s3c64xx_spi_cleanup(struct spi_device *spi)
struct s3c64xx_spi_driver_data *sdd;
sdd = spi_master_get_devdata(spi->master);
if (cs && sdd->cs_gpio) {
gpio_free(cs->line);
if (spi->cs_gpio) {
gpio_free(spi->cs_gpio);
if (spi->dev.of_node)
kfree(cs);
}
@ -1448,9 +1449,11 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
sdd->regs + S3C64XX_SPI_INT_EN);
if (spi_register_master(master)) {
dev_err(&pdev->dev, "cannot register SPI master\n");
ret = -EBUSY;
pm_runtime_enable(&pdev->dev);
ret = devm_spi_register_master(&pdev->dev, master);
if (ret != 0) {
dev_err(&pdev->dev, "cannot register SPI master: %d\n", ret);
goto err3;
}
@ -1460,8 +1463,6 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
mem_res,
sdd->rx_dma.dmach, sdd->tx_dma.dmach);
pm_runtime_enable(&pdev->dev);
return 0;
err3:
@ -1481,16 +1482,12 @@ static int s3c64xx_spi_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
spi_unregister_master(master);
writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
clk_disable_unprepare(sdd->src_clk);
clk_disable_unprepare(sdd->clk);
spi_master_put(master);
return 0;
}
@ -1548,9 +1545,17 @@ static int s3c64xx_spi_runtime_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
int ret;
clk_prepare_enable(sdd->src_clk);
clk_prepare_enable(sdd->clk);
ret = clk_prepare_enable(sdd->src_clk);
if (ret != 0)
return ret;
ret = clk_prepare_enable(sdd->clk);
if (ret != 0) {
clk_disable_unprepare(sdd->src_clk);
return ret;
}
return 0;
}
@ -1636,6 +1641,18 @@ static struct platform_device_id s3c64xx_spi_driver_ids[] = {
};
static const struct of_device_id s3c64xx_spi_dt_match[] = {
{ .compatible = "samsung,s3c2443-spi",
.data = (void *)&s3c2443_spi_port_config,
},
{ .compatible = "samsung,s3c6410-spi",
.data = (void *)&s3c6410_spi_port_config,
},
{ .compatible = "samsung,s5pc100-spi",
.data = (void *)&s5pc100_spi_port_config,
},
{ .compatible = "samsung,s5pv210-spi",
.data = (void *)&s5pv210_spi_port_config,
},
{ .compatible = "samsung,exynos4210-spi",
.data = (void *)&exynos4_spi_port_config,
},
@ -1653,22 +1670,13 @@ static struct platform_driver s3c64xx_spi_driver = {
.pm = &s3c64xx_spi_pm,
.of_match_table = of_match_ptr(s3c64xx_spi_dt_match),
},
.probe = s3c64xx_spi_probe,
.remove = s3c64xx_spi_remove,
.id_table = s3c64xx_spi_driver_ids,
};
MODULE_ALIAS("platform:s3c64xx-spi");
static int __init s3c64xx_spi_init(void)
{
return platform_driver_probe(&s3c64xx_spi_driver, s3c64xx_spi_probe);
}
subsys_initcall(s3c64xx_spi_init);
static void __exit s3c64xx_spi_exit(void)
{
platform_driver_unregister(&s3c64xx_spi_driver);
}
module_exit(s3c64xx_spi_exit);
module_platform_driver(s3c64xx_spi_driver);
MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
MODULE_DESCRIPTION("S3C64XX SPI Controller Driver");

35
drivers/spi/spi.c
View File

@ -1370,6 +1370,41 @@ int spi_register_master(struct spi_master *master)
}
EXPORT_SYMBOL_GPL(spi_register_master);
static void devm_spi_unregister(struct device *dev, void *res)
{
spi_unregister_master(*(struct spi_master **)res);
}
/**
* dev_spi_register_master - register managed SPI master controller
* @dev: device managing SPI master
* @master: initialized master, originally from spi_alloc_master()
* Context: can sleep
*
* Register a SPI device as with spi_register_master() which will
* automatically be unregister
*/
int devm_spi_register_master(struct device *dev, struct spi_master *master)
{
struct spi_master **ptr;
int ret;
ptr = devres_alloc(devm_spi_unregister, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return -ENOMEM;
ret = spi_register_master(master);
if (ret != 0) {
*ptr = master;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return ret;
}
EXPORT_SYMBOL_GPL(devm_spi_register_master);
static int __unregister(struct device *dev, void *null)
{
spi_unregister_device(to_spi_device(dev));

2
include/linux/spi/spi.h
View File

@ -462,6 +462,8 @@ extern struct spi_master *
spi_alloc_master(struct device *host, unsigned size);
extern int spi_register_master(struct spi_master *master);
extern int devm_spi_register_master(struct device *dev,
struct spi_master *master);
extern void spi_unregister_master(struct spi_master *master);
extern struct spi_master *spi_busnum_to_master(u16 busnum);