1/* linux/drivers/serial/s5pv210.c 2 * 3 * Copyright (c) 2010 Samsung Electronics Co., Ltd. 4 * http://www.samsung.com/ 5 * 6 * Based on drivers/serial/s3c6400.c 7 * 8 * Driver for Samsung S5PV210 SoC UARTs. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13*/ 14 15#include <linux/module.h> 16#include <linux/ioport.h> 17#include <linux/io.h> 18#include <linux/platform_device.h> 19#include <linux/init.h> 20#include <linux/serial_core.h> 21#include <linux/serial.h> 22 23#include <asm/irq.h> 24#include <mach/hardware.h> 25#include <plat/regs-serial.h> 26#include "samsung.h" 27 28static int s5pv210_serial_setsource(struct uart_port *port, 29 struct s3c24xx_uart_clksrc *clk) 30{ 31 struct s3c2410_uartcfg *cfg = port->dev->platform_data; 32 unsigned long ucon = rd_regl(port, S3C2410_UCON); 33 34 if ((cfg->clocks_size) == 1) 35 return 0; 36 37 if (strcmp(clk->name, "pclk") == 0) 38 ucon &= ~S5PV210_UCON_CLKMASK; 39 else if (strcmp(clk->name, "uclk1") == 0) 40 ucon |= S5PV210_UCON_CLKMASK; 41 else { 42 printk(KERN_ERR "unknown clock source %s\n", clk->name); 43 return -EINVAL; 44 } 45 46 wr_regl(port, S3C2410_UCON, ucon); 47 return 0; 48} 49 50 51static int s5pv210_serial_getsource(struct uart_port *port, 52 struct s3c24xx_uart_clksrc *clk) 53{ 54 struct s3c2410_uartcfg *cfg = port->dev->platform_data; 55 u32 ucon = rd_regl(port, S3C2410_UCON); 56 57 clk->divisor = 1; 58 59 if ((cfg->clocks_size) == 1) 60 return 0; 61 62 switch (ucon & S5PV210_UCON_CLKMASK) { 63 case S5PV210_UCON_PCLK: 64 clk->name = "pclk"; 65 break; 66 case S5PV210_UCON_UCLK: 67 clk->name = "uclk1"; 68 break; 69 } 70 71 return 0; 72} 73 74static int s5pv210_serial_resetport(struct uart_port *port, 75 struct s3c2410_uartcfg *cfg) 76{ 77 unsigned long ucon = rd_regl(port, S3C2410_UCON); 78 79 ucon &= S5PV210_UCON_CLKMASK; 80 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon); 81 wr_regl(port, S3C2410_ULCON, cfg->ulcon); 82 83 /* reset both fifos */ 84 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); 85 wr_regl(port, S3C2410_UFCON, cfg->ufcon); 86 87 return 0; 88} 89 90#define S5PV210_UART_DEFAULT_INFO(fifo_size) \ 91 .name = "Samsung S5PV210 UART0", \ 92 .type = PORT_S3C6400, \ 93 .fifosize = fifo_size, \ 94 .has_divslot = 1, \ 95 .rx_fifomask = S5PV210_UFSTAT_RXMASK, \ 96 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \ 97 .rx_fifofull = S5PV210_UFSTAT_RXFULL, \ 98 .tx_fifofull = S5PV210_UFSTAT_TXFULL, \ 99 .tx_fifomask = S5PV210_UFSTAT_TXMASK, \ 100 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \ 101 .get_clksrc = s5pv210_serial_getsource, \ 102 .set_clksrc = s5pv210_serial_setsource, \ 103 .reset_port = s5pv210_serial_resetport 104 105static struct s3c24xx_uart_info s5p_port_fifo256 = { 106 S5PV210_UART_DEFAULT_INFO(256), 107}; 108 109static struct s3c24xx_uart_info s5p_port_fifo64 = { 110 S5PV210_UART_DEFAULT_INFO(64), 111}; 112 113static struct s3c24xx_uart_info s5p_port_fifo16 = { 114 S5PV210_UART_DEFAULT_INFO(16), 115}; 116 117static struct s3c24xx_uart_info *s5p_uart_inf[] = { 118 [0] = &s5p_port_fifo256, 119 [1] = &s5p_port_fifo64, 120 [2] = &s5p_port_fifo16, 121 [3] = &s5p_port_fifo16, 122}; 123 124/* device management */ 125static int s5p_serial_probe(struct platform_device *pdev) 126{ 127 return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]); 128} 129 130static struct platform_driver s5p_serial_driver = { 131 .probe = s5p_serial_probe, 132 .remove = __devexit_p(s3c24xx_serial_remove), 133 .driver = { 134 .name = "s5pv210-uart", 135 .owner = THIS_MODULE, 136 }, 137}; 138 139static int __init s5pv210_serial_console_init(void) 140{ 141 return s3c24xx_serial_initconsole(&s5p_serial_driver, s5p_uart_inf); 142} 143 144console_initcall(s5pv210_serial_console_init); 145 146static int __init s5p_serial_init(void) 147{ 148 return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf); 149} 150 151static void __exit s5p_serial_exit(void) 152{ 153 platform_driver_unregister(&s5p_serial_driver); 154} 155 156module_init(s5p_serial_init); 157module_exit(s5p_serial_exit); 158 159MODULE_LICENSE("GPL"); 160MODULE_ALIAS("platform:s5pv210-uart"); 161MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support"); 162MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>"); 163