1/* linux/drivers/serial/s3c24a0.c 2 * 3 * Driver for Samsung S3C24A0 SoC onboard UARTs. 4 * 5 * Based on drivers/serial/s3c2410.c 6 * 7 * Author: Sandeep Patil <sandeep.patil@azingo.com> 8 * 9 * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics 10 * http://armlinux.simtec.co.uk/ 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15*/ 16 17#include <linux/module.h> 18#include <linux/ioport.h> 19#include <linux/platform_device.h> 20#include <linux/init.h> 21#include <linux/serial_core.h> 22#include <linux/serial.h> 23#include <linux/io.h> 24#include <linux/irq.h> 25 26#include <mach/hardware.h> 27 28#include <plat/regs-serial.h> 29#include <mach/regs-gpio.h> 30 31#include "samsung.h" 32 33static int s3c24a0_serial_setsource(struct uart_port *port, 34 struct s3c24xx_uart_clksrc *clk) 35{ 36 unsigned long ucon = rd_regl(port, S3C2410_UCON); 37 38 if (strcmp(clk->name, "uclk") == 0) 39 ucon |= S3C2410_UCON_UCLK; 40 else 41 ucon &= ~S3C2410_UCON_UCLK; 42 43 wr_regl(port, S3C2410_UCON, ucon); 44 return 0; 45} 46 47static int s3c24a0_serial_getsource(struct uart_port *port, 48 struct s3c24xx_uart_clksrc *clk) 49{ 50 unsigned long ucon = rd_regl(port, S3C2410_UCON); 51 52 clk->divisor = 1; 53 clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk"; 54 55 return 0; 56} 57 58static int s3c24a0_serial_resetport(struct uart_port *port, 59 struct s3c2410_uartcfg *cfg) 60{ 61 dbg("s3c24a0_serial_resetport: port=%p (%08lx), cfg=%p\n", 62 port, port->mapbase, cfg); 63 64 wr_regl(port, S3C2410_UCON, cfg->ucon); 65 wr_regl(port, S3C2410_ULCON, cfg->ulcon); 66 67 /* reset both fifos */ 68 69 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); 70 wr_regl(port, S3C2410_UFCON, cfg->ufcon); 71 72 return 0; 73} 74 75static struct s3c24xx_uart_info s3c24a0_uart_inf = { 76 .name = "Samsung S3C24A0 UART", 77 .type = PORT_S3C2410, 78 .fifosize = 16, 79 .rx_fifomask = S3C24A0_UFSTAT_RXMASK, 80 .rx_fifoshift = S3C24A0_UFSTAT_RXSHIFT, 81 .rx_fifofull = S3C24A0_UFSTAT_RXFULL, 82 .tx_fifofull = S3C24A0_UFSTAT_TXFULL, 83 .tx_fifomask = S3C24A0_UFSTAT_TXMASK, 84 .tx_fifoshift = S3C24A0_UFSTAT_TXSHIFT, 85 .get_clksrc = s3c24a0_serial_getsource, 86 .set_clksrc = s3c24a0_serial_setsource, 87 .reset_port = s3c24a0_serial_resetport, 88}; 89 90static int s3c24a0_serial_probe(struct platform_device *dev) 91{ 92 return s3c24xx_serial_probe(dev, &s3c24a0_uart_inf); 93} 94 95static struct platform_driver s3c24a0_serial_driver = { 96 .probe = s3c24a0_serial_probe, 97 .remove = __devexit_p(s3c24xx_serial_remove), 98 .driver = { 99 .name = "s3c24a0-uart", 100 .owner = THIS_MODULE, 101 }, 102}; 103 104s3c24xx_console_init(&s3c24a0_serial_driver, &s3c24a0_uart_inf); 105 106static int __init s3c24a0_serial_init(void) 107{ 108 return s3c24xx_serial_init(&s3c24a0_serial_driver, &s3c24a0_uart_inf); 109} 110 111static void __exit s3c24a0_serial_exit(void) 112{ 113 platform_driver_unregister(&s3c24a0_serial_driver); 114} 115 116module_init(s3c24a0_serial_init); 117module_exit(s3c24a0_serial_exit); 118