/* 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) { struct s3c2410_uartcfg *cfg = port->dev->platform_data; unsigned long ucon = rd_regl(port, S3C2410_UCON); if ((cfg->clocks_size) == 1) return 0; 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) { struct s3c2410_uartcfg *cfg = port->dev->platform_data; u32 ucon = rd_regl(port, S3C2410_UCON); clk->divisor = 1; if ((cfg->clocks_size) == 1) return 0; 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_driver = { .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_driver, s5p_uart_inf); } console_initcall(s5pv210_serial_console_init); static int __init s5p_serial_init(void) { return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf); } static void __exit s5p_serial_exit(void) { platform_driver_unregister(&s5p_serial_driver); } 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>");