123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152 |
- /*
- * Driver for Samsung S3C6400 and S3C6410 SoC onboard UARTs.
- *
- * Copyright 2008 Openmoko, Inc.
- * Copyright 2008 Simtec Electronics
- * Ben Dooks <ben@simtec.co.uk>
- * http://armlinux.simtec.co.uk/
- *
- * 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 s3c6400_serial_setsource(struct uart_port *port,
- struct s3c24xx_uart_clksrc *clk)
- {
- unsigned long ucon = rd_regl(port, S3C2410_UCON);
- if (strcmp(clk->name, "uclk0") == 0) {
- ucon &= ~S3C6400_UCON_CLKMASK;
- ucon |= S3C6400_UCON_UCLK0;
- } else if (strcmp(clk->name, "uclk1") == 0)
- ucon |= S3C6400_UCON_UCLK1;
- else if (strcmp(clk->name, "pclk") == 0) {
- /* See notes about transitioning from UCLK to PCLK */
- ucon &= ~S3C6400_UCON_UCLK0;
- } else {
- printk(KERN_ERR "unknown clock source %s\n", clk->name);
- return -EINVAL;
- }
- wr_regl(port, S3C2410_UCON, ucon);
- return 0;
- }
- static int s3c6400_serial_getsource(struct uart_port *port,
- struct s3c24xx_uart_clksrc *clk)
- {
- u32 ucon = rd_regl(port, S3C2410_UCON);
- clk->divisor = 1;
- switch (ucon & S3C6400_UCON_CLKMASK) {
- case S3C6400_UCON_UCLK0:
- clk->name = "uclk0";
- break;
- case S3C6400_UCON_UCLK1:
- clk->name = "uclk1";
- break;
- case S3C6400_UCON_PCLK:
- case S3C6400_UCON_PCLK2:
- clk->name = "pclk";
- break;
- }
- return 0;
- }
- static int s3c6400_serial_resetport(struct uart_port *port,
- struct s3c2410_uartcfg *cfg)
- {
- unsigned long ucon = rd_regl(port, S3C2410_UCON);
- dbg("s3c6400_serial_resetport: port=%p (%08lx), cfg=%p\n",
- port, port->mapbase, cfg);
- /* ensure we don't change the clock settings... */
- ucon &= S3C6400_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;
- }
- static struct s3c24xx_uart_info s3c6400_uart_inf = {
- .name = "Samsung S3C6400 UART",
- .type = PORT_S3C6400,
- .fifosize = 64,
- .has_divslot = 1,
- .rx_fifomask = S3C2440_UFSTAT_RXMASK,
- .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
- .rx_fifofull = S3C2440_UFSTAT_RXFULL,
- .tx_fifofull = S3C2440_UFSTAT_TXFULL,
- .tx_fifomask = S3C2440_UFSTAT_TXMASK,
- .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
- .get_clksrc = s3c6400_serial_getsource,
- .set_clksrc = s3c6400_serial_setsource,
- .reset_port = s3c6400_serial_resetport,
- };
- /* device management */
- static int s3c6400_serial_probe(struct platform_device *dev)
- {
- dbg("s3c6400_serial_probe: dev=%p\n", dev);
- return s3c24xx_serial_probe(dev, &s3c6400_uart_inf);
- }
- static struct platform_driver s3c6400_serial_driver = {
- .probe = s3c6400_serial_probe,
- .remove = __devexit_p(s3c24xx_serial_remove),
- .driver = {
- .name = "s3c6400-uart",
- .owner = THIS_MODULE,
- },
- };
- s3c24xx_console_init(&s3c6400_serial_driver, &s3c6400_uart_inf);
- static int __init s3c6400_serial_init(void)
- {
- return s3c24xx_serial_init(&s3c6400_serial_driver, &s3c6400_uart_inf);
- }
- static void __exit s3c6400_serial_exit(void)
- {
- platform_driver_unregister(&s3c6400_serial_driver);
- }
- module_init(s3c6400_serial_init);
- module_exit(s3c6400_serial_exit);
- MODULE_DESCRIPTION("Samsung S3C6400,S3C6410 SoC Serial port driver");
- MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
- MODULE_LICENSE("GPL v2");
- MODULE_ALIAS("platform:s3c6400-uart");
|