[PATCH 09/19] drivers: serial: add support for Samsung S5PC110 SoC uart
jassi brar
jassisinghbrar at gmail.com
Wed Nov 18 09:14:52 EST 2009
On Wed, Nov 18, 2009 at 10:33 PM, Marek Szyprowski
<m.szyprowski at samsung.com> wrote:
> From: Kyungmin Park <kyungmin.park at samsung.com>
>
> Samsung S5PC110 SoCs have UART that differs a bit from the one known
> from the previous Samsung SoCs. This patch adds support for this new
> driver.
>
> Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
> Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
>
>
> ---
> arch/arm/plat-s3c/include/plat/regs-serial.h | 31 ++++++
> drivers/serial/Kconfig | 7 ++
> drivers/serial/Makefile | 1 +
> drivers/serial/s5pc110.c | 143 ++++++++++++++++++++++++++
> 4 files changed, 182 insertions(+), 0 deletions(-)
> create mode 100644 drivers/serial/s5pc110.c
>
> diff --git a/arch/arm/plat-s3c/include/plat/regs-serial.h b/arch/arm/plat-s3c/include/plat/regs-serial.h
> index 66af75a..910cfba 100644
> --- a/arch/arm/plat-s3c/include/plat/regs-serial.h
> +++ b/arch/arm/plat-s3c/include/plat/regs-serial.h
> @@ -194,6 +194,37 @@
> #define S3C64XX_UINTSP 0x34
> #define S3C64XX_UINTM 0x38
>
> +/* S5PC110 UCON */
> +#define S5PC110_UCON_CLKMASK (1<<10)
> +#define S5PC110_UCON_PCLK (0<<10)
> +#define S5PC110_UCON_SCLK_UART (1<<10)
> +
> +/* S5PC110 FIFO trigger levels */
> +#define S5PC110_UFCON_RXTRIG1 (0<<4)
> +#define S5PC110_UFCON_RXTRIG4 (1<<4)
> +#define S5PC110_UFCON_RXTRIG8 (2<<4)
> +#define S5PC110_UFCON_RXTRIG16 (3<<4)
> +#define S5PC110_UFCON_RXTRIG32 (4<<4)
> +#define S5PC110_UFCON_RXTRIG64 (5<<4)
> +#define S5PC110_UFCON_RXTRIG128 (6<<4)
> +#define S5PC110_UFCON_RXTRIG256 (7<<4)
> +
> +#define S5PC110_UFCON_TXTRIG1 (0<<8)
> +#define S5PC110_UFCON_TXTRIG4 (1<<8)
> +#define S5PC110_UFCON_TXTRIG8 (2<<8)
> +#define S5PC110_UFCON_TXTRIG16 (3<<8)
> +#define S5PC110_UFCON_TXTRIG32 (4<<8)
> +#define S5PC110_UFCON_TXTRIG64 (5<<8)
> +#define S5PC110_UFCON_TXTRIG128 (6<<8)
> +#define S5PC110_UFCON_TXTRIG256 (7<<8)
> +
> +#define S5PC110_UFSTAT_TXFULL (1<<24)
> +#define S5PC110_UFSTAT_RXFULL (1<<8)
> +#define S5PC110_UFSTAT_TXSHIFT (16)
> +#define S5PC110_UFSTAT_RXSHIFT (0)
> +#define S5PC110_UFSTAT_TXMASK (255<<16)
> +#define S5PC110_UFSTAT_RXMASK (255)
> +
> #ifndef __ASSEMBLY__
>
> /* struct s3c24xx_uart_clksrc
> diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
> index e522572..d119cac 100644
> --- a/drivers/serial/Kconfig
> +++ b/drivers/serial/Kconfig
> @@ -540,6 +540,13 @@ config SERIAL_S5PC100
> help
> Serial port support for the Samsung S5PC100 SoCs
>
> +config SERIAL_S5PC110
> + tristate "Samsung S5PC110 Serial port support"
> + depends on SERIAL_SAMSUNG && CPU_S5PC110
> + default y
> + help
> + Serial port support for the Samsung S5PC110 SoCs
> +
> config SERIAL_MAX3100
> tristate "MAX3100 support"
> depends on SPI
> diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
> index d21d5dd..43d6123 100644
> --- a/drivers/serial/Makefile
> +++ b/drivers/serial/Makefile
> @@ -45,6 +45,7 @@ obj-$(CONFIG_SERIAL_S3C2440) += s3c2440.o
> obj-$(CONFIG_SERIAL_S3C24A0) += s3c24a0.o
> obj-$(CONFIG_SERIAL_S3C6400) += s3c6400.o
> obj-$(CONFIG_SERIAL_S5PC100) += s3c6400.o
> +obj-$(CONFIG_SERIAL_S5PC110) += s5pc110.o
> obj-$(CONFIG_SERIAL_MAX3100) += max3100.o
> obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
> obj-$(CONFIG_SERIAL_MUX) += mux.o
> diff --git a/drivers/serial/s5pc110.c b/drivers/serial/s5pc110.c
> new file mode 100644
> index 0000000..1e1e229
> --- /dev/null
> +++ b/drivers/serial/s5pc110.c
> @@ -0,0 +1,143 @@
> +/*
> + * linux/drivers/serial/s5pc110.c
> + *
> + * Driver for Samsung S5PC110 SoC onboard UARTs.
> + *
> + * Copyright 2009 Samsung Electronics
> + * Kyungin Park <kyungmin.park at samsung.com>
> + *
> + * 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/module.h>
> +#include <linux/ioport.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +#include <linux/init.h>
> +#include <linux/serial_core.h>
> +#include <linux/serial.h>
> +
> +#include <asm/irq.h>
> +#include <mach/hardware.h>
> +
> +#include <plat/regs-serial.h>
> +
> +#include "samsung.h"
> +
> +static int s5pc110_serial_setsource(struct uart_port *port,
> + struct s3c24xx_uart_clksrc *clk)
> +{
> + unsigned long ucon = rd_regl(port, S3C2410_UCON);
> +
> + if (strcmp(clk->name, "uclk0") == 0)
> + ucon |= S5PC110_UCON_SCLK_UART;
> + else if (strcmp(clk->name, "pclk") == 0)
> + /* See notes about transitioning from UCLK to PCLK */
> + ucon &= ~S5PC110_UCON_SCLK_UART;
> + else {
> + printk(KERN_ERR "unknown clock source %s\n", clk->name);
> + return -EINVAL;
> + }
> +
> + wr_regl(port, S3C2410_UCON, ucon);
> + return 0;
> +}
Not just about this c110 patch: I think this string comparison thing
isn't very neat.
I think we'd better be doing it by indexing into an array of clock
names(which can be
defined in some platform specific code).
> +static int s5pc110_serial_getsource(struct uart_port *port,
> + struct s3c24xx_uart_clksrc *clk)
> +{
> + u32 ucon = rd_regl(port, S3C2410_UCON);
> +
> + clk->divisor = 1;
> +
> + switch (ucon & S5PC110_UCON_CLKMASK) {
> + case S5PC110_UCON_SCLK_UART:
> + clk->name = "uclk0";
> + break;
> +
> + case S5PC110_UCON_PCLK:
> + clk->name = "pclk";
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int s5pc110_serial_resetport(struct uart_port *port,
> + struct s3c2410_uartcfg *cfg)
> +{
> + unsigned long ucon = rd_regl(port, S3C2410_UCON);
> +
> + dbg("s5pc110_serial_resetport: port=%p (%08lx), cfg=%p\n",
> + port, port->mapbase, cfg);
> +
> + /* ensure we don't change the clock settings... */
> +
> + ucon &= S5PC110_UCON_CLKMASK;
> +
> + wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
> + wr_regl(port, S3C2410_ULCON, cfg->ulcon);
> +
> + /* reset both fifos */
> +
> + wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
> + wr_regl(port, S3C2410_UFCON, cfg->ufcon);
> +
> + return 0;
> +}
> +
> +static struct s3c24xx_uart_info s5pc110_uart_inf = {
> + .name = "Samsung S5PC110 UART",
> + .type = PORT_S3C6400,
> + .fifosize = 16,
> + .has_divslot = 1,
> + .rx_fifomask = S5PC110_UFSTAT_RXMASK,
> + .rx_fifoshift = S5PC110_UFSTAT_RXSHIFT,
> + .rx_fifofull = S5PC110_UFSTAT_RXFULL,
> + .tx_fifofull = S5PC110_UFSTAT_TXFULL,
> + .tx_fifomask = S5PC110_UFSTAT_TXMASK,
> + .tx_fifoshift = S5PC110_UFSTAT_TXSHIFT,
> + .get_clksrc = s5pc110_serial_getsource,
> + .set_clksrc = s5pc110_serial_setsource,
> + .reset_port = s5pc110_serial_resetport,
> +};
> +
> +/* device management */
> +
> +static int s5pc110_serial_probe(struct platform_device *dev)
> +{
> + dbg("s5pc110_serial_probe: dev=%p\n", dev);
> +
> + return s3c24xx_serial_probe(dev, &s5pc110_uart_inf);
> +}
> +
> +static struct platform_driver s5pc110_serial_driver = {
> + .probe = s5pc110_serial_probe,
> + .remove = __devexit_p(s3c24xx_serial_remove),
> + .driver = {
> + .name = "s5pc110-uart",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +s3c24xx_console_init(&s5pc110_serial_driver, &s5pc110_uart_inf);
> +
> +static int __init s5pc110_serial_init(void)
> +{
> + return s3c24xx_serial_init(&s5pc110_serial_driver, &s5pc110_uart_inf);
> +}
> +
> +static void __exit s5pc110_serial_exit(void)
> +{
> + platform_driver_unregister(&s5pc110_serial_driver);
> +}
> +
> +module_init(s5pc110_serial_init);
> +module_exit(s5pc110_serial_exit);
> +
> +MODULE_DESCRIPTION("Samsung S5PC110 SoC Serial port driver");
> +MODULE_AUTHOR("Kyungmin Park <kyungmin.park at samsung.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:s5pc110-uart");
> --
> 1.6.4
>
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