[ARM] 3639/1: S3C2412: serial port support
Patch from Ben Dooks Serial port support for the on-board UART blocks on the Samsung S3C2412 and S3C2413 UARTs. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -354,21 +354,24 @@ config SERIAL_CLPS711X_CONSOLE
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kernel at boot time.)
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config SERIAL_S3C2410
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tristate "Samsung S3C2410 Serial port support"
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tristate "Samsung S3C2410/S3C2440/S3C2442/S3C2412 Serial port support"
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depends on ARM && ARCH_S3C2410
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select SERIAL_CORE
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help
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Support for the on-chip UARTs on the Samsung S3C2410X CPU,
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Support for the on-chip UARTs on the Samsung S3C24XX series CPUs,
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providing /dev/ttySAC0, 1 and 2 (note, some machines may not
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provide all of these ports, depending on how the serial port
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pins are configured.
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Currently this driver supports the UARTS on the S3C2410, S3C2440,
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S3C2442, S3C2412 and S3C2413 CPUs.
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config SERIAL_S3C2410_CONSOLE
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bool "Support for console on S3C2410 serial port"
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depends on SERIAL_S3C2410=y
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select SERIAL_CORE_CONSOLE
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help
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Allow selection of the S3C2410 on-board serial ports for use as
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Allow selection of the S3C24XX on-board serial ports for use as
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an virtual console.
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Even if you say Y here, the currently visible virtual console
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@ -872,6 +872,8 @@ static const char *s3c24xx_serial_type(struct uart_port *port)
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return "S3C2410";
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case PORT_S3C2440:
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return "S3C2440";
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case PORT_S3C2412:
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return "S3C2412";
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default:
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return NULL;
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}
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@ -1528,6 +1530,141 @@ static inline void s3c2440_serial_exit(void)
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#define s3c2440_uart_inf_at NULL
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#endif /* CONFIG_CPU_S3C2440 */
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#if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
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static int s3c2412_serial_setsource(struct uart_port *port,
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struct s3c24xx_uart_clksrc *clk)
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{
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unsigned long ucon = rd_regl(port, S3C2410_UCON);
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ucon &= ~S3C2412_UCON_CLKMASK;
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if (strcmp(clk->name, "uclk") == 0)
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ucon |= S3C2440_UCON_UCLK;
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else if (strcmp(clk->name, "pclk") == 0)
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ucon |= S3C2440_UCON_PCLK;
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else if (strcmp(clk->name, "usysclk") == 0)
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ucon |= S3C2412_UCON_USYSCLK;
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else {
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printk(KERN_ERR "unknown clock source %s\n", clk->name);
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return -EINVAL;
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}
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wr_regl(port, S3C2410_UCON, ucon);
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return 0;
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}
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static int s3c2412_serial_getsource(struct uart_port *port,
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struct s3c24xx_uart_clksrc *clk)
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{
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unsigned long ucon = rd_regl(port, S3C2410_UCON);
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switch (ucon & S3C2412_UCON_CLKMASK) {
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case S3C2412_UCON_UCLK:
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clk->divisor = 1;
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clk->name = "uclk";
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break;
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case S3C2412_UCON_PCLK:
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case S3C2412_UCON_PCLK2:
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clk->divisor = 1;
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clk->name = "pclk";
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break;
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case S3C2412_UCON_USYSCLK:
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clk->divisor = 1;
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clk->name = "usysclk";
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break;
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}
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return 0;
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}
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static int s3c2412_serial_resetport(struct uart_port *port,
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struct s3c2410_uartcfg *cfg)
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{
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unsigned long ucon = rd_regl(port, S3C2410_UCON);
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dbg("%s: port=%p (%08lx), cfg=%p\n",
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__FUNCTION__, port, port->mapbase, cfg);
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/* ensure we don't change the clock settings... */
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ucon &= S3C2412_UCON_CLKMASK;
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wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
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wr_regl(port, S3C2410_ULCON, cfg->ulcon);
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/* reset both fifos */
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wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
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wr_regl(port, S3C2410_UFCON, cfg->ufcon);
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return 0;
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}
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static struct s3c24xx_uart_info s3c2412_uart_inf = {
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.name = "Samsung S3C2412 UART",
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.type = PORT_S3C2412,
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.fifosize = 64,
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.rx_fifomask = S3C2440_UFSTAT_RXMASK,
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.rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
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.rx_fifofull = S3C2440_UFSTAT_RXFULL,
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.tx_fifofull = S3C2440_UFSTAT_TXFULL,
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.tx_fifomask = S3C2440_UFSTAT_TXMASK,
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.tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
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.get_clksrc = s3c2412_serial_getsource,
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.set_clksrc = s3c2412_serial_setsource,
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.reset_port = s3c2412_serial_resetport,
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};
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/* device management */
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static int s3c2412_serial_probe(struct platform_device *dev)
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{
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dbg("s3c2440_serial_probe: dev=%p\n", dev);
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return s3c24xx_serial_probe(dev, &s3c2440_uart_inf);
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}
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static struct platform_driver s3c2412_serial_drv = {
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.probe = s3c2412_serial_probe,
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.remove = s3c24xx_serial_remove,
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.suspend = s3c24xx_serial_suspend,
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.resume = s3c24xx_serial_resume,
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.driver = {
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.name = "s3c2412-uart",
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.owner = THIS_MODULE,
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},
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};
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static inline int s3c2412_serial_init(void)
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{
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return s3c24xx_serial_init(&s3c2412_serial_drv, &s3c2412_uart_inf);
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}
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static inline void s3c2412_serial_exit(void)
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{
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platform_driver_unregister(&s3c2412_serial_drv);
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}
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#define s3c2412_uart_inf_at &s3c2412_uart_inf
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#else
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static inline int s3c2412_serial_init(void)
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{
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return 0;
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}
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static inline void s3c2412_serial_exit(void)
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{
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}
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#define s3c2412_uart_inf_at NULL
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#endif /* CONFIG_CPU_S3C2440 */
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/* module initialisation code */
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static int __init s3c24xx_serial_modinit(void)
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@ -1542,6 +1679,7 @@ static int __init s3c24xx_serial_modinit(void)
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s3c2400_serial_init();
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s3c2410_serial_init();
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s3c2412_serial_init();
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s3c2440_serial_init();
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return 0;
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@ -1551,6 +1689,7 @@ static void __exit s3c24xx_serial_modexit(void)
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{
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s3c2400_serial_exit();
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s3c2410_serial_exit();
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s3c2412_serial_exit();
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s3c2440_serial_exit();
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uart_unregister_driver(&s3c24xx_uart_drv);
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@ -1773,6 +1912,8 @@ static int s3c24xx_serial_initconsole(void)
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info = s3c2410_uart_inf_at;
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} else if (strcmp(dev->name, "s3c2440-uart") == 0) {
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info = s3c2440_uart_inf_at;
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} else if (strcmp(dev->name, "s3c2412-uart") == 0) {
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info = s3c2412_uart_inf_at;
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} else {
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printk(KERN_ERR "s3c24xx: no driver for %s\n", dev->name);
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return 0;
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@ -1796,4 +1937,4 @@ console_initcall(s3c24xx_serial_initconsole);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
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MODULE_DESCRIPTION("Samsung S3C2410/S3C2440 Serial port driver");
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MODULE_DESCRIPTION("Samsung S3C2410/S3C2440/S3C2412 Serial port driver");
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@ -82,6 +82,12 @@
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#define S3C2440_UCON2_DIVMASK (7 << 12)
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#define S3C2440_UCON_DIVSHIFT (12)
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#define S3C2412_UCON_CLKMASK (3<<10)
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#define S3C2412_UCON_UCLK (1<<10)
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#define S3C2412_UCON_USYSCLK (3<<10)
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#define S3C2412_UCON_PCLK (0<<10)
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#define S3C2412_UCON_PCLK2 (2<<10)
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#define S3C2410_UCON_UCLK (1<<10)
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#define S3C2410_UCON_SBREAK (1<<4)
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@ -124,6 +130,15 @@
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#define S3C2410_UMCOM_AFC (1<<4)
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#define S3C2410_UMCOM_RTS_LOW (1<<0)
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#define S3C2412_UMCON_AFC_63 (0<<5)
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#define S3C2412_UMCON_AFC_56 (1<<5)
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#define S3C2412_UMCON_AFC_48 (2<<5)
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#define S3C2412_UMCON_AFC_40 (3<<5)
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#define S3C2412_UMCON_AFC_32 (4<<5)
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#define S3C2412_UMCON_AFC_24 (5<<5)
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#define S3C2412_UMCON_AFC_16 (6<<5)
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#define S3C2412_UMCON_AFC_8 (7<<5)
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#define S3C2410_UFSTAT_TXFULL (1<<9)
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#define S3C2410_UFSTAT_RXFULL (1<<8)
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#define S3C2410_UFSTAT_TXMASK (15<<4)
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@ -130,6 +130,9 @@
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/* SUN4V Hypervisor Console */
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#define PORT_SUNHV 72
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#define PORT_S3C2412 73
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#ifdef __KERNEL__
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#include <linux/compiler.h>
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