Ben Dooks | b690ace | 2008-10-21 14:07:03 +0100 | [diff] [blame] | 1 | /* linux/drivers/serial/s3c6400.c |
| 2 | * |
| 3 | * Driver for Samsung S3C6400 and S3C6410 SoC onboard UARTs. |
| 4 | * |
| 5 | * Copyright 2008 Openmoko, Inc. |
| 6 | * Copyright 2008 Simtec Electronics |
| 7 | * Ben Dooks <ben@simtec.co.uk> |
| 8 | * http://armlinux.simtec.co.uk/ |
| 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 | |
| 26 | #include <plat/regs-serial.h> |
| 27 | |
| 28 | #include "samsung.h" |
| 29 | |
| 30 | static int s3c6400_serial_setsource(struct uart_port *port, |
| 31 | struct s3c24xx_uart_clksrc *clk) |
| 32 | { |
| 33 | unsigned long ucon = rd_regl(port, S3C2410_UCON); |
| 34 | |
| 35 | if (strcmp(clk->name, "uclk0") == 0) { |
| 36 | ucon &= ~S3C6400_UCON_CLKMASK; |
| 37 | ucon |= S3C6400_UCON_UCLK0; |
| 38 | } else if (strcmp(clk->name, "uclk1") == 0) |
| 39 | ucon |= S3C6400_UCON_UCLK1; |
| 40 | else if (strcmp(clk->name, "pclk") == 0) { |
| 41 | /* See notes about transitioning from UCLK to PCLK */ |
| 42 | ucon &= ~S3C6400_UCON_UCLK0; |
| 43 | } else { |
| 44 | printk(KERN_ERR "unknown clock source %s\n", clk->name); |
| 45 | return -EINVAL; |
| 46 | } |
| 47 | |
| 48 | wr_regl(port, S3C2410_UCON, ucon); |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | |
| 53 | static int s3c6400_serial_getsource(struct uart_port *port, |
| 54 | struct s3c24xx_uart_clksrc *clk) |
| 55 | { |
| 56 | u32 ucon = rd_regl(port, S3C2410_UCON); |
| 57 | |
| 58 | clk->divisor = 1; |
| 59 | |
| 60 | switch (ucon & S3C6400_UCON_CLKMASK) { |
| 61 | case S3C6400_UCON_UCLK0: |
| 62 | clk->name = "uclk0"; |
| 63 | break; |
| 64 | |
| 65 | case S3C6400_UCON_UCLK1: |
| 66 | clk->name = "uclk1"; |
| 67 | break; |
| 68 | |
| 69 | case S3C6400_UCON_PCLK: |
| 70 | case S3C6400_UCON_PCLK2: |
| 71 | clk->name = "pclk"; |
| 72 | break; |
| 73 | } |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static int s3c6400_serial_resetport(struct uart_port *port, |
| 79 | struct s3c2410_uartcfg *cfg) |
| 80 | { |
| 81 | unsigned long ucon = rd_regl(port, S3C2410_UCON); |
| 82 | |
| 83 | dbg("s3c6400_serial_resetport: port=%p (%08lx), cfg=%p\n", |
| 84 | port, port->mapbase, cfg); |
| 85 | |
| 86 | /* ensure we don't change the clock settings... */ |
| 87 | |
| 88 | ucon &= S3C6400_UCON_CLKMASK; |
| 89 | |
| 90 | wr_regl(port, S3C2410_UCON, ucon | cfg->ucon); |
| 91 | wr_regl(port, S3C2410_ULCON, cfg->ulcon); |
| 92 | |
| 93 | /* reset both fifos */ |
| 94 | |
| 95 | wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); |
| 96 | wr_regl(port, S3C2410_UFCON, cfg->ufcon); |
| 97 | |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | static struct s3c24xx_uart_info s3c6400_uart_inf = { |
| 102 | .name = "Samsung S3C6400 UART", |
| 103 | .type = PORT_S3C6400, |
| 104 | .fifosize = 64, |
Ben Dooks | 090f848 | 2008-12-12 00:24:21 +0000 | [diff] [blame^] | 105 | .has_divslot = 1, |
Ben Dooks | b690ace | 2008-10-21 14:07:03 +0100 | [diff] [blame] | 106 | .rx_fifomask = S3C2440_UFSTAT_RXMASK, |
| 107 | .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, |
| 108 | .rx_fifofull = S3C2440_UFSTAT_RXFULL, |
| 109 | .tx_fifofull = S3C2440_UFSTAT_TXFULL, |
| 110 | .tx_fifomask = S3C2440_UFSTAT_TXMASK, |
| 111 | .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, |
| 112 | .get_clksrc = s3c6400_serial_getsource, |
| 113 | .set_clksrc = s3c6400_serial_setsource, |
| 114 | .reset_port = s3c6400_serial_resetport, |
| 115 | }; |
| 116 | |
| 117 | /* device management */ |
| 118 | |
| 119 | static int s3c6400_serial_probe(struct platform_device *dev) |
| 120 | { |
| 121 | dbg("s3c6400_serial_probe: dev=%p\n", dev); |
| 122 | return s3c24xx_serial_probe(dev, &s3c6400_uart_inf); |
| 123 | } |
| 124 | |
| 125 | static struct platform_driver s3c6400_serial_drv = { |
| 126 | .probe = s3c6400_serial_probe, |
| 127 | .remove = s3c24xx_serial_remove, |
| 128 | .driver = { |
| 129 | .name = "s3c6400-uart", |
| 130 | .owner = THIS_MODULE, |
| 131 | }, |
| 132 | }; |
| 133 | |
| 134 | s3c24xx_console_init(&s3c6400_serial_drv, &s3c6400_uart_inf); |
| 135 | |
| 136 | static int __init s3c6400_serial_init(void) |
| 137 | { |
| 138 | return s3c24xx_serial_init(&s3c6400_serial_drv, &s3c6400_uart_inf); |
| 139 | } |
| 140 | |
| 141 | static void __exit s3c6400_serial_exit(void) |
| 142 | { |
| 143 | platform_driver_unregister(&s3c6400_serial_drv); |
| 144 | } |
| 145 | |
| 146 | module_init(s3c6400_serial_init); |
| 147 | module_exit(s3c6400_serial_exit); |
| 148 | |
| 149 | MODULE_DESCRIPTION("Samsung S3C6400,S3C6410 SoC Serial port driver"); |
| 150 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); |
| 151 | MODULE_LICENSE("GPL v2"); |
| 152 | MODULE_ALIAS("platform:s3c6400-uart"); |