diff options
Diffstat (limited to 'drivers/serial/s5pv210.c')
| -rw-r--r-- | drivers/serial/s5pv210.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/drivers/serial/s5pv210.c b/drivers/serial/s5pv210.c new file mode 100644 index 00000000000..8dc03837617 --- /dev/null +++ b/drivers/serial/s5pv210.c @@ -0,0 +1,154 @@ +/* linux/drivers/serial/s5pv210.c + * + * Copyright (c) 2010 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + * + * Based on drivers/serial/s3c6400.c + * + * Driver for Samsung S5PV210 SoC UARTs. + * + * 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 s5pv210_serial_setsource(struct uart_port *port, + struct s3c24xx_uart_clksrc *clk) +{ + unsigned long ucon = rd_regl(port, S3C2410_UCON); + + if (strcmp(clk->name, "pclk") == 0) + ucon &= ~S5PV210_UCON_CLKMASK; + else if (strcmp(clk->name, "uclk1") == 0) + ucon |= S5PV210_UCON_CLKMASK; + else { + printk(KERN_ERR "unknown clock source %s\n", clk->name); + return -EINVAL; + } + + wr_regl(port, S3C2410_UCON, ucon); + return 0; +} + + +static int s5pv210_serial_getsource(struct uart_port *port, + struct s3c24xx_uart_clksrc *clk) +{ + u32 ucon = rd_regl(port, S3C2410_UCON); + + clk->divisor = 1; + + switch (ucon & S5PV210_UCON_CLKMASK) { + case S5PV210_UCON_PCLK: + clk->name = "pclk"; + break; + case S5PV210_UCON_UCLK: + clk->name = "uclk1"; + break; + } + + return 0; +} + +static int s5pv210_serial_resetport(struct uart_port *port, + struct s3c2410_uartcfg *cfg) +{ + unsigned long ucon = rd_regl(port, S3C2410_UCON); + + ucon &= S5PV210_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; +} + +#define S5PV210_UART_DEFAULT_INFO(fifo_size) \ + .name = "Samsung S5PV210 UART0", \ + .type = PORT_S3C6400, \ + .fifosize = fifo_size, \ + .has_divslot = 1, \ + .rx_fifomask = S5PV210_UFSTAT_RXMASK, \ + .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \ + .rx_fifofull = S5PV210_UFSTAT_RXFULL, \ + .tx_fifofull = S5PV210_UFSTAT_TXFULL, \ + .tx_fifomask = S5PV210_UFSTAT_TXMASK, \ + .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \ + .get_clksrc = s5pv210_serial_getsource, \ + .set_clksrc = s5pv210_serial_setsource, \ + .reset_port = s5pv210_serial_resetport + +static struct s3c24xx_uart_info s5p_port_fifo256 = { + S5PV210_UART_DEFAULT_INFO(256), +}; + +static struct s3c24xx_uart_info s5p_port_fifo64 = { + S5PV210_UART_DEFAULT_INFO(64), +}; + +static struct s3c24xx_uart_info s5p_port_fifo16 = { + S5PV210_UART_DEFAULT_INFO(16), +}; + +static struct s3c24xx_uart_info *s5p_uart_inf[] = { + [0] = &s5p_port_fifo256, + [1] = &s5p_port_fifo64, + [2] = &s5p_port_fifo16, + [3] = &s5p_port_fifo16, +}; + +/* device management */ +static int s5p_serial_probe(struct platform_device *pdev) +{ + return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]); +} + +static struct platform_driver s5p_serial_drv = { + .probe = s5p_serial_probe, + .remove = __devexit_p(s3c24xx_serial_remove), + .driver = { + .name = "s5pv210-uart", + .owner = THIS_MODULE, + }, +}; + +static int __init s5pv210_serial_console_init(void) +{ + return s3c24xx_serial_initconsole(&s5p_serial_drv, s5p_uart_inf); +} + +console_initcall(s5pv210_serial_console_init); + +static int __init s5p_serial_init(void) +{ + return s3c24xx_serial_init(&s5p_serial_drv, *s5p_uart_inf); +} + +static void __exit s5p_serial_exit(void) +{ + platform_driver_unregister(&s5p_serial_drv); +} + +module_init(s5p_serial_init); +module_exit(s5p_serial_exit); + +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:s5pv210-uart"); +MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support"); +MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>"); |