--- linux-2.6.10-rc2/include/asm-arm/arch-s3c2410/regs-serial.h 2004-11-15 11:12:08.000000000 +0000 +++ linux-2.6.10-rc1-bk22-serial4/include/asm-arm/arch-s3c2410/regs-serial.h 2004-11-12 15:41:57.000000000 +0000 @@ -68,6 +68,12 @@ #define S3C2410_LCON_STOPB (1<<2) #define S3C2410_LCON_IRM (1<<6) +#define S3C2440_UCON_CLKMASK (3<<10) +#define S3C2440_UCON_PCLK (0<<10) +#define S3C2440_UCON_UCLK (1<<10) +#define S3C2440_UCON_PCLK2 (2<<10) +#define S3C2440_UCON_FCLK (3<<10) + #define S3C2410_UCON_UCLK (1<<10) #define S3C2410_UCON_SBREAK (1<<4) @@ -77,19 +83,35 @@ #define S3C2410_UCON_RXIRQMODE (1<<0) #define S3C2410_UCON_RXFIFO_TOI (1<<7) -#define S3C2410_UCON_DEFAULT (S3C2410_UCON_TXILEVEL | S3C2410_UCON_RXILEVEL \ - | S3C2410_UCON_TXIRQMODE | S3C2410_UCON_RXIRQMODE \ - | S3C2410_UCON_RXFIFO_TOI) +#define S3C2410_UCON_DEFAULT (S3C2410_UCON_TXILEVEL | \ + S3C2410_UCON_RXILEVEL | \ + S3C2410_UCON_TXIRQMODE | \ + S3C2410_UCON_RXIRQMODE | \ + S3C2410_UCON_RXFIFO_TOI) #define S3C2410_UFCON_FIFOMODE (1<<0) #define S3C2410_UFCON_TXTRIG0 (0<<6) #define S3C2410_UFCON_RXTRIG8 (1<<4) #define S3C2410_UFCON_RXTRIG12 (2<<4) +/* S3C2440 FIFO trigger levels */ +#define S3C2440_UFCON_RXTRIG1 (0<<4) +#define S3C2440_UFCON_RXTRIG8 (1<<4) +#define S3C2440_UFCON_RXTRIG16 (2<<4) +#define S3C2440_UFCON_RXTRIG32 (3<<4) + +#define S3C2440_UFCON_TXTRIG0 (0<<6) +#define S3C2440_UFCON_TXTRIG16 (1<<6) +#define S3C2440_UFCON_TXTRIG32 (2<<6) +#define S3C2440_UFCON_TXTRIG48 (3<<6) + #define S3C2410_UFCON_RESETBOTH (3<<1) +#define S3C2410_UFCON_RESETTX (1<<2) +#define S3C2410_UFCON_RESETRX (1<<1) -#define S3C2410_UFCON_DEFAULT (S3C2410_UFCON_FIFOMODE | S3C2410_UFCON_TXTRIG0 \ - | S3C2410_UFCON_RXTRIG8 ) +#define S3C2410_UFCON_DEFAULT (S3C2410_UFCON_FIFOMODE | \ + S3C2410_UFCON_TXTRIG0 | \ + S3C2410_UFCON_RXTRIG8 ) #define S3C2410_UFSTAT_TXFULL (1<<9) #define S3C2410_UFSTAT_RXFULL (1<<8) @@ -111,32 +133,36 @@ #define S3C2410_UERSTAT_OVERRUN (1<<0) #define S3C2410_UERSTAT_FRAME (1<<2) -#define S3C2410_UERSTAT_ANY (S3C2410_UERSTAT_OVERRUN | S3C2410_UERSTAT_FRAME) +#define S3C2410_UERSTAT_BREAK (1<<3) +#define S3C2410_UERSTAT_ANY (S3C2410_UERSTAT_OVERRUN | \ + S3C2410_UERSTAT_FRAME | \ + S3C2410_UERSTAT_BREAK) -/* fifo size information */ +#define S3C2410_UMSTAT_CTS (1<<0) +#define S3C2410_UMSTAT_DeltaCTS (1<<2) #ifndef __ASSEMBLY__ -static inline int S3C2410_UFCON_RXC(int fcon) -{ - if (fcon & S3C2410_UFSTAT_RXFULL) - return 16; - - return ((fcon) & S3C2410_UFSTAT_RXMASK) >> S3C2410_UFSTAT_RXSHIFT; -} - -static inline int S3C2410_UFCON_TXC(int fcon) -{ - if (fcon & S3C2410_UFSTAT_TXFULL) - return 16; - return ((fcon) & S3C2410_UFSTAT_TXMASK) >> S3C2410_UFSTAT_TXSHIFT; -} -#endif /* __ASSEMBLY__ */ +/* struct s3c24xx_uart_clksrc + * + * this structure defines a named clock source that can be used for the + * uart, so that the best clock can be selected for the requested baud + * rate. + * + * min_baud and max_baud define the range of baud-rates this clock is + * acceptable for, if they are both zero, it is assumed any baud rate that + * can be generated from this clock will be used. + * + * divisor gives the divisor from the clock to the one seen by the uart +*/ -#define S3C2410_UMSTAT_CTS (1<<0) -#define S3C2410_UMSTAT_DeltaCTS (1<<2) +struct s3c24xx_uart_clksrc { + const char *name; + unsigned int divisor; + unsigned int min_baud; + unsigned int max_baud; +}; -#ifndef __ASSEMBLY__ /* configuration structure for per-machine configurations for the * serial port * @@ -148,15 +174,23 @@ unsigned char hwport; /* hardware port number */ unsigned char unused; unsigned short flags; - - unsigned long *clock; /* pointer to clock rate */ + unsigned long uart_flags; /* default uart flags */ unsigned long ucon; /* value of ucon for port */ unsigned long ulcon; /* value of ulcon for port */ unsigned long ufcon; /* value of ufcon for port */ + + struct s3c24xx_uart_clksrc *clocks; + unsigned int clocks_size; }; -extern struct s3c2410_uartcfg *s3c2410_uartcfgs; +/* s3c24xx_uart_devs + * + * this is exported from the core as we cannot use driver_register(), + * or platform_add_device() before the console_initcall() +*/ + +extern struct platform_device *s3c24xx_uart_devs[3]; #endif /* __ASSEMBLY__ */ --- linux-2.6.10-rc2/drivers/serial/s3c2410.c 2004-11-15 11:12:05.000000000 +0000 +++ linux-2.6.10-rc1-bk22-serial4/drivers/serial/s3c2410.c 2004-11-15 11:18:25.000000000 +0000 @@ -1,7 +1,7 @@ /* - * linux/drivers/char/s3c2410.c + * linux/drivers/serial/s3c2410.c * - * Driver for onboard UARTs on the Samsung S3C2410 + * Driver for onboard UARTs on the Samsung S3C24XX * * Based on drivers/char/serial.c and drivers/char/21285.c * @@ -9,55 +9,153 @@ * * Changelog: * - */ + * 22-Jul-2004 BJD Finished off device rewrite + * + * 21-Jul-2004 BJD Thanks to for pointing out + * problems with baud rate and loss of IR settings. Update + * to add configuration via platform_device structure + * + * 28-Sep-2004 BJD Re-write for the following items + * - S3C2410 and S3C2440 serial support + * - Power Management support + * - Fix console via IrDA devices + * - SysReq (Herbert Pötzl) + * - Break character handling (Herbert Pötzl) + * - spin-lock initialisation (Dimitry Andric) + * - added clock control + * - updated init code to use platform_device info +*/ + +/* Hote on 2410 error handling + * + * The s3c2410 manual has a love/hate affair with the contents of the + * UERSTAT register in the UART blocks, and keeps marking some of the + * error bits as reserved. Having checked with the s3c2410x01, + * it copes with BREAKs properly, so I am happy to ignore the RESERVED + * feature from the latter versions of the manual. + * + * If it becomes aparrent that latter versions of the 2410 remove these + * bits, then action will have to be taken to differentiate the versions + * and change the policy on BREAK + * + * BJD, 04-Nov-2004 +*/ + #include + +#if defined(CONFIG_SERIAL_S3C2410_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) +#define SUPPORT_SYSRQ +#endif + #include +#include #include #include #include +#include #include #include #include #include #include +#include #include #include #include +#include + #include +#include + +#include + +/* structures */ + +struct s3c24xx_uart_info { + char *name; + unsigned int type; + unsigned int fifosize; + unsigned long rx_fifomask; + unsigned long rx_fifoshift; + unsigned long tx_fifomask; + unsigned long tx_fifoshift; + unsigned long tx_fifofull; + + /* clock source control */ + + int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk); + int (*set_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk); +}; + +struct s3c24xx_uart_port { + unsigned char rx_claimed; + unsigned char tx_claimed; + + struct s3c24xx_uart_info *info; + struct s3c24xx_uart_clksrc *clksrc; + struct clk *clk; + struct clk *baudclk; + struct uart_port port; +}; + + +/* configuration defines */ #if 0 -#include -#define dbg(x...) llprintk(x) +#if 1 +/* send debug to the low-level output routines */ + +extern void printascii(const char *); + +static void +s3c24xx_serial_dbg(const char *fmt, ...) +{ + va_list va; + char buff[256]; + + va_start(va, fmt); + vsprintf(buff, fmt, va); + va_end(va); + + printascii(buff); +} + +#define dbg(x...) s3c24xx_serial_dbg(x) + #else -#define dbg(x...) +#define dbg(x...) printk(KERN_DEBUG "s3c24xx: "); +#endif +#else /* no debug */ +#define dbg(x...) do {} while(0) #endif -#define SERIAL_S3C2410_NAME "ttySAC" -#define SERIAL_S3C2410_MAJOR 204 -#define SERIAL_S3C2410_MINOR 64 +/* UART name and device definitions */ + +#define S3C24XX_SERIAL_NAME "ttySAC" +#define S3C24XX_SERIAL_DEVFS "tts/" +#define S3C24XX_SERIAL_MAJOR 204 +#define S3C24XX_SERIAL_MINOR 64 + + +/* conversion functions */ + +#define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev) +#define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data) /* we can support 3 uarts, but not always use them */ #define NR_PORTS (3) -static const char serial_s3c2410_name[] = "Samsung S3C2410 UART"; - /* port irq numbers */ #define TX_IRQ(port) ((port)->irq + 1) #define RX_IRQ(port) ((port)->irq) -#define tx_enabled(port) ((port)->unused[0]) -#define rx_enabled(port) ((port)->unused[1]) - -/* flag to ignore all characters comming in */ -#define RXSTAT_DUMMY_READ (0x10000000) +/* register access controls */ -/* access functions */ - -#define portaddr(port, reg) ((void *)((port)->membase + (reg))) +#define portaddr(port, reg) ((port)->membase + (reg)) #define rd_regb(port, reg) (__raw_readb(portaddr(port, reg))) #define rd_regl(port, reg) (__raw_readl(portaddr(port, reg))) @@ -68,102 +166,230 @@ #define wr_regl(port, reg, val) \ do { __raw_writel(val, portaddr(port, reg)); } while(0) +/* macros to change one thing to another */ + +#define tx_enabled(port) ((port)->unused[0]) +#define rx_enabled(port) ((port)->unused[1]) + +/* flag to ignore all characters comming in */ +#define RXSTAT_DUMMY_READ (0x10000000) + +static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port) +{ + return container_of(port, struct s3c24xx_uart_port, port); +} + +/* translate a port to the device name */ + +static inline char *s3c24xx_serial_portname(struct uart_port *port) +{ + return to_platform_device(port->dev)->name; +} + +static int s3c24xx_serial_txempty_nofifo(struct uart_port *port) +{ + return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE); +} + +static void s3c24xx_serial_rx_enable(struct uart_port *port) +{ + unsigned long flags; + unsigned int ucon, ufcon; + int count = 10000; + + spin_lock_irqsave(&port->lock, flags); + + while (--count && !s3c24xx_serial_txempty_nofifo(port)) + udelay(100); + ufcon = rd_regl(port, S3C2410_UFCON); + ufcon |= S3C2410_UFCON_RESETRX; + wr_regl(port, S3C2410_UFCON, ufcon); + + ucon = rd_regl(port, S3C2410_UCON); + ucon |= S3C2410_UCON_RXIRQMODE; + wr_regl(port, S3C2410_UCON, ucon); + rx_enabled(port) = 1; + spin_unlock_irqrestore(&port->lock, flags); +} -/* code */ +static void s3c24xx_serial_rx_disable(struct uart_port *port) +{ + unsigned long flags; + unsigned int ucon; + + spin_lock_irqsave(&port->lock, flags); + + ucon = rd_regl(port, S3C2410_UCON); + ucon &= ~S3C2410_UCON_RXIRQMODE; + wr_regl(port, S3C2410_UCON, ucon); + + rx_enabled(port) = 0; + spin_unlock_irqrestore(&port->lock, flags); +} static void -serial_s3c2410_stop_tx(struct uart_port *port, unsigned int tty_stop) +s3c24xx_serial_stop_tx(struct uart_port *port, unsigned int tty_stop) { if (tx_enabled(port)) { disable_irq(TX_IRQ(port)); tx_enabled(port) = 0; + if (port->flags & UPF_CONS_FLOW) + s3c24xx_serial_rx_enable(port); } } static void -serial_s3c2410_start_tx(struct uart_port *port, unsigned int tty_start) +s3c24xx_serial_start_tx(struct uart_port *port, unsigned int tty_start) { if (!tx_enabled(port)) { + if (port->flags & UPF_CONS_FLOW) + s3c24xx_serial_rx_disable(port); + enable_irq(TX_IRQ(port)); tx_enabled(port) = 1; } } -static void serial_s3c2410_stop_rx(struct uart_port *port) + +static void s3c24xx_serial_stop_rx(struct uart_port *port) { if (rx_enabled(port)) { - dbg("serial_s3c2410_stop_rx: port=%p\n", port); + dbg("s3c24xx_serial_stop_rx: port=%p\n", port); disable_irq(RX_IRQ(port)); rx_enabled(port) = 0; } } -static void serial_s3c2410_enable_ms(struct uart_port *port) +static void s3c24xx_serial_enable_ms(struct uart_port *port) +{ +} + +static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port) +{ + return to_ourport(port)->info; +} + +static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port) { + if (port->dev == NULL) + return NULL; + + return (struct s3c2410_uartcfg *)port->dev->platform_data; } +static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport, + unsigned long ufstat) +{ + struct s3c24xx_uart_info *info = ourport->info; + return (ufstat & info->rx_fifomask) >> info->rx_fifoshift; +} + + /* ? - where has parity gone?? */ #define S3C2410_UERSTAT_PARITY (0x1000) static irqreturn_t -serial_s3c2410_rx_chars(int irq, void *dev_id, struct pt_regs *regs) +s3c24xx_serial_rx_chars(int irq, void *dev_id, struct pt_regs *regs) { - struct uart_port *port = dev_id; + struct s3c24xx_uart_port *ourport = dev_id; + struct uart_port *port = &ourport->port; struct tty_struct *tty = port->info->tty; - unsigned int ufcon, ch, flag, rxs, ufstat; - int max_count = 256; + unsigned int ufcon, ch, flag, ufstat, uerstat; + int max_count = 64; while (max_count-- > 0) { ufcon = rd_regl(port, S3C2410_UFCON); ufstat = rd_regl(port, S3C2410_UFSTAT); - if (S3C2410_UFCON_RXC(ufstat) == 0) + if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0) break; if (tty->flip.count >= TTY_FLIPBUF_SIZE) { if (tty->low_latency) tty_flip_buffer_push(tty); + /* * If this failed then we will throw away the * bytes but must do so to clear interrupts */ } + uerstat = rd_regl(port, S3C2410_UERSTAT); ch = rd_regb(port, S3C2410_URXH); + + if (port->flags & UPF_CONS_FLOW) { + int txe = s3c24xx_serial_txempty_nofifo(port); + + if (rx_enabled(port)) { + if (!txe) { + rx_enabled(port) = 0; + continue; + } + } else { + if (txe) { + ufcon |= S3C2410_UFCON_RESETRX; + wr_regl(port, S3C2410_UFCON, ufcon); + rx_enabled(port) = 1; + goto out; + } + continue; + } + } + + /* insert the character into the buffer */ + flag = TTY_NORMAL; port->icount.rx++; - rxs = rd_regb(port, S3C2410_UERSTAT) | RXSTAT_DUMMY_READ; + if (uerstat & S3C2410_UERSTAT_ANY) { + dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n", + ch, uerstat); + + /* check for break */ + if (uerstat & S3C2410_UERSTAT_BREAK) { + dbg("break!\n"); + port->icount.brk++; + if (uart_handle_break(port)) + goto ignore_char; + } - if (rxs & S3C2410_UERSTAT_ANY) { - if (rxs & S3C2410_UERSTAT_FRAME) + if (uerstat & S3C2410_UERSTAT_FRAME) port->icount.frame++; - if (rxs & S3C2410_UERSTAT_OVERRUN) + if (uerstat & S3C2410_UERSTAT_OVERRUN) port->icount.overrun++; - rxs &= port->read_status_mask; + uerstat &= port->read_status_mask; - if (rxs & S3C2410_UERSTAT_PARITY) + if (uerstat & S3C2410_UERSTAT_BREAK) + flag = TTY_BREAK; + else if (uerstat & S3C2410_UERSTAT_PARITY) flag = TTY_PARITY; - else if (rxs & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN)) + else if (uerstat & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN)) flag = TTY_FRAME; } - if ((rxs & port->ignore_status_mask) == 0) { + if (uart_handle_sysrq_char(port, ch, regs)) + goto ignore_char; + + if ((uerstat & port->ignore_status_mask) == 0) { tty_insert_flip_char(tty, ch, flag); } - if ((rxs & S3C2410_UERSTAT_OVERRUN) && + if ((uerstat & S3C2410_UERSTAT_OVERRUN) && tty->flip.count < TTY_FLIPBUF_SIZE) { /* * Overrun is special, since it's reported * immediately, and doesn't affect the current * character. */ + tty_insert_flip_char(tty, 0, TTY_OVERRUN); } + + ignore_char: + continue; } tty_flip_buffer_push(tty); @@ -171,10 +397,10 @@ return IRQ_HANDLED; } -static irqreturn_t -serial_s3c2410_tx_chars(int irq, void *dev_id, struct pt_regs *regs) +static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id, struct pt_regs *regs) { - struct uart_port *port = (struct uart_port *)dev_id; + struct s3c24xx_uart_port *ourport = id; + struct uart_port *port = &ourport->port; struct circ_buf *xmit = &port->info->xmit; int count = 256; @@ -190,14 +416,14 @@ */ if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - serial_s3c2410_stop_tx(port, 0); + s3c24xx_serial_stop_tx(port, 0); goto out; } /* try and drain the buffer... */ while (!uart_circ_empty(xmit) && count-- > 0) { - if (rd_regl(port, S3C2410_UFSTAT) & S3C2410_UFSTAT_TXFULL) + if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull) break; wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]); @@ -209,22 +435,31 @@ uart_write_wakeup(port); if (uart_circ_empty(xmit)) - serial_s3c2410_stop_tx(port, 0); + s3c24xx_serial_stop_tx(port, 0); out: return IRQ_HANDLED; } -static unsigned int -serial_s3c2410_tx_empty(struct uart_port *port) +static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port) { - unsigned int ufcon = rd_regl(port, S3C2410_UFCON); - return (S3C2410_UFCON_TXC(ufcon) != 0) ? 0 : TIOCSER_TEMT; + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT); + unsigned long ufcon = rd_regl(port, S3C2410_UFCON); + + if (ufcon & S3C2410_UFCON_FIFOMODE) { + if ((ufstat & info->tx_fifomask) != 0 || + (ufstat & info->tx_fifofull)) + return 0; + + return 1; + } + + return s3c24xx_serial_txempty_nofifo(port); } /* no modem control lines */ -static unsigned int -serial_s3c2410_get_mctrl(struct uart_port *port) +static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port) { unsigned int umstat = rd_regb(port,S3C2410_UMSTAT); @@ -234,13 +469,12 @@ return TIOCM_CAR | TIOCM_DSR; } -static void -serial_s3c2410_set_mctrl(struct uart_port *port, unsigned int mctrl) +static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) { /* todo - possibly remove AFC and do manual CTS */ } -static void serial_s3c2410_break_ctl(struct uart_port *port, int break_state) +static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) { unsigned long flags; unsigned int ucon; @@ -259,46 +493,250 @@ spin_unlock_irqrestore(&port->lock, flags); } -static int serial_s3c2410_startup(struct uart_port *port) +static void s3c24xx_serial_shutdown(struct uart_port *port) { + struct s3c24xx_uart_port *ourport = to_ourport(port); + + if (ourport->tx_claimed) { + free_irq(TX_IRQ(port), ourport); + tx_enabled(port) = 0; + ourport->tx_claimed = 0; + } + + if (ourport->rx_claimed) { + free_irq(RX_IRQ(port), ourport); + ourport->rx_claimed = 0; + rx_enabled(port) = 0; + } +} + + +static int s3c24xx_serial_startup(struct uart_port *port) +{ + struct s3c24xx_uart_port *ourport = to_ourport(port); + unsigned long flags; int ret; - tx_enabled(port) = 1; - rx_enabled(port) = 1; + dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n", + port->mapbase, port->membase); + + local_irq_save(flags); - dbg("serial_s3c2410_startup: port=%p (%p)\n", - port, port->mapbase); + rx_enabled(port) = 1; - ret = request_irq(RX_IRQ(port), serial_s3c2410_rx_chars, 0, - serial_s3c2410_name, port); + ret = request_irq(RX_IRQ(port), + s3c24xx_serial_rx_chars, 0, + s3c24xx_serial_portname(port), ourport); - if (ret != 0) + if (ret != 0) { + printk(KERN_ERR "cannot get irq %d\n", RX_IRQ(port)); return ret; + } + + ourport->rx_claimed = 1; + + dbg("requesting tx irq...\n"); + + tx_enabled(port) = 1; - ret = request_irq(TX_IRQ(port), serial_s3c2410_tx_chars, 0, - serial_s3c2410_name, port); + ret = request_irq(TX_IRQ(port), + s3c24xx_serial_tx_chars, 0, + s3c24xx_serial_portname(port), ourport); if (ret) { - free_irq(RX_IRQ(port), port); - return ret; + printk(KERN_ERR "cannot get irq %d\n", TX_IRQ(port)); + goto err; } + ourport->tx_claimed = 1; + + dbg("s3c24xx_serial_startup ok\n"); + /* the port reset code should have done the correct - * register setup for the port controls */ + * register setup for the port controls */ + + local_irq_restore(flags); + return ret; + err: + s3c24xx_serial_shutdown(port); + local_irq_restore(flags); return ret; } -static void serial_s3c2410_shutdown(struct uart_port *port) +/* power power management control */ + +static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, + unsigned int old) { - free_irq(TX_IRQ(port), port); - free_irq(RX_IRQ(port), port); + struct s3c24xx_uart_port *ourport = to_ourport(port); + + switch (level) { + case 3: + if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL) + clk_disable(ourport->baudclk); + + clk_disable(ourport->clk); + break; + + case 0: + clk_enable(ourport->clk); + + if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL) + clk_enable(ourport->baudclk); + + break; + default: + printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level); + } } -static void -serial_s3c2410_set_termios(struct uart_port *port, struct termios *termios, - struct termios *old) +/* baud rate calculation + * + * The UARTs on the S3C2410/S3C2440 can take their clocks from a number + * of different sources, including the peripheral clock ("pclk") and an + * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk") + * with a programmable extra divisor. + * + * The following code goes through the clock sources, and calculates the + * baud clocks (and the resultant actual baud rates) and then tries to + * pick the closest one and select that. + * + * NOTES: + * 1) there is no current code to properly select/deselect FCLK on + * the s3c2440, so only specify FCLK or non-FCLK in the clock + * sources for the UART + * +*/ + + +#define MAX_CLKS (8) + +static struct s3c24xx_uart_clksrc tmp_clksrc = { + .name = "pclk", + .min_baud = 0, + .max_baud = 0, + .divisor = 1, +}; + +static inline int +s3c24xx_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c) +{ + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + + return (info->get_clksrc)(port, c); +} + +static inline int +s3c24xx_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c) +{ + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + + return (info->set_clksrc)(port, c); +} + +struct baud_calc { + struct s3c24xx_uart_clksrc *clksrc; + unsigned int calc; + unsigned int quot; + struct clk *src; +}; + +static int s3c24xx_serial_calcbaud(struct baud_calc *calc, + struct uart_port *port, + struct s3c24xx_uart_clksrc *clksrc, + unsigned int baud) +{ + unsigned long rate; + + calc->src = clk_get(port->dev, clksrc->name); + if (calc->src == NULL || IS_ERR(calc->src)) + return 0; + + rate = clk_get_rate(calc->src); + + calc->clksrc = clksrc; + calc->quot = (rate + (8 * baud)) / (16 * baud); + calc->calc = (rate / (calc->quot * 16)); + + calc->quot--; + return 1; +} + +static unsigned int s3c24xx_serial_getclk(struct uart_port *port, + struct s3c24xx_uart_clksrc **clksrc, + struct clk **clk, + unsigned int baud) +{ + struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); + struct s3c24xx_uart_clksrc *clkp; + struct baud_calc res[MAX_CLKS]; + struct baud_calc *resptr, *best, *sptr; + int i; + + clkp = cfg->clocks; + best = NULL; + + if (cfg->clocks_size < 2) { + if (cfg->clocks_size == 0) + clkp = &tmp_clksrc; + + s3c24xx_serial_calcbaud(res, port, clkp, baud); + best = res; + resptr = best + 1; + } else { + resptr = res; + + for (i = 0; i < cfg->clocks_size; i++, clkp++) { + if (s3c24xx_serial_calcbaud(resptr, port, clkp, baud)) + resptr++; + } + } + + /* ok, we now need to select the best clock we found */ + + if (!best) { + unsigned int deviation = (1<<30)|((1<<30)-1); + int calc_deviation; + + for (sptr = res; sptr < resptr; sptr++) { + printk(KERN_DEBUG + "found clk %p (%s) quot %d, calc %d\n", + sptr->clksrc, sptr->clksrc->name, + sptr->quot, sptr->calc); + + calc_deviation = baud - sptr->calc; + if (calc_deviation < 0) + calc_deviation = -calc_deviation; + + if (calc_deviation < deviation) { + best = sptr; + deviation = calc_deviation; + } + } + + printk(KERN_DEBUG "best %p (deviation %d)\n", best, deviation); + } + + printk(KERN_DEBUG "selected clock %p (%s) quot %d, calc %d\n", + best->clksrc, best->clksrc->name, best->quot, best->calc); + + /* store results to pass back */ + + *clksrc = best->clksrc; + *clk = best->src; + + return best->quot; +} + +static void s3c24xx_serial_set_termios(struct uart_port *port, + struct termios *termios, + struct termios *old) { + struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); + struct s3c24xx_uart_port *ourport = to_ourport(port); + struct s3c24xx_uart_clksrc *clksrc; + struct clk *clk; unsigned long flags; unsigned int baud, quot; unsigned int ulcon; @@ -310,15 +748,33 @@ termios->c_cflag |= CLOCAL; /* - * We don't support BREAK character recognition. - */ - termios->c_iflag &= ~(IGNBRK | BRKINT); - - /* * Ask the core to calculate the divisor for us. */ - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); - quot = uart_get_divisor(port, baud); + + baud = uart_get_baud_rate(port, termios, old, 0, 115200*8); + + if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) + quot = port->custom_divisor; + else + quot = s3c24xx_serial_getclk(port, &clksrc, &clk, baud); + + /* check to see if we need to change clock source */ + + if (ourport->clksrc != clksrc || ourport->baudclk != clk) { + s3c24xx_serial_setsource(port, clksrc); + + if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) { + clk_disable(ourport->baudclk); + clk_unuse(ourport->baudclk); + ourport->baudclk = NULL; + } + + clk_use(clk); + clk_enable(clk); + + ourport->clksrc = clksrc; + ourport->baudclk = clk; + } switch (termios->c_cflag & CSIZE) { case CS5: @@ -340,6 +796,9 @@ break; } + /* preserve original lcon IR settings */ + ulcon |= (cfg->ulcon & S3C2410_LCON_IRM); + if (termios->c_cflag & CSTOPB) ulcon |= S3C2410_LCON_STOPB; @@ -352,18 +811,12 @@ ulcon |= S3C2410_LCON_PNONE; } - /* - if (port->fifosize) - enable_fifo() - */ - spin_lock_irqsave(&port->lock, flags); - dbg("setting ulcon to %08x\n", ulcon); - //dbg("\n"); + dbg("setting ulcon to %08x, brddiv to %d\n", ulcon, quot); - /* set the ulcon register */ wr_regl(port, S3C2410_ULCON, ulcon); + wr_regl(port, S3C2410_UBRDIV, quot); dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n", rd_regl(port, S3C2410_ULCON), @@ -400,113 +853,151 @@ spin_unlock_irqrestore(&port->lock, flags); } -static const char *serial_s3c2410_type(struct uart_port *port) +static const char *s3c24xx_serial_type(struct uart_port *port) { - return port->type == PORT_S3C2410 ? "S3C2410" : NULL; + switch (port->type) { + case PORT_S3C2410: + return "S3C2410"; + case PORT_S3C2440: + return "S3C2440"; + default: + return NULL; + } } #define MAP_SIZE (0x100) -static void -serial_s3c2410_release_port(struct uart_port *port) +static void s3c24xx_serial_release_port(struct uart_port *port) { release_mem_region(port->mapbase, MAP_SIZE); } -static int -serial_s3c2410_request_port(struct uart_port *port) +static int s3c24xx_serial_request_port(struct uart_port *port) { - return request_mem_region(port->mapbase, MAP_SIZE, serial_s3c2410_name) - != NULL ? 0 : -EBUSY; + char *name = s3c24xx_serial_portname(port); + return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY; } -static void -serial_s3c2410_config_port(struct uart_port *port, int flags) +static void s3c24xx_serial_config_port(struct uart_port *port, int flags) { + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); + if (flags & UART_CONFIG_TYPE && - serial_s3c2410_request_port(port) == 0) - port->type = PORT_S3C2410; + s3c24xx_serial_request_port(port) == 0) + port->type = info->type; } /* * verify the new serial_struct (for TIOCSSERIAL). */ static int -serial_s3c2410_verify_port(struct uart_port *port, struct serial_struct *ser) +s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser) { - int ret = 0; + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); - if (ser->type != PORT_UNKNOWN && ser->type != PORT_S3C2410) - ret = -EINVAL; + if (ser->type != PORT_UNKNOWN && ser->type != info->type) + return -EINVAL; - return ret; + return 0; } -static struct uart_ops serial_s3c2410_ops = { - .tx_empty = serial_s3c2410_tx_empty, - .get_mctrl = serial_s3c2410_get_mctrl, - .set_mctrl = serial_s3c2410_set_mctrl, - .stop_tx = serial_s3c2410_stop_tx, - .start_tx = serial_s3c2410_start_tx, - .stop_rx = serial_s3c2410_stop_rx, - .enable_ms = serial_s3c2410_enable_ms, - .break_ctl = serial_s3c2410_break_ctl, - .startup = serial_s3c2410_startup, - .shutdown = serial_s3c2410_shutdown, - .set_termios = serial_s3c2410_set_termios, - .type = serial_s3c2410_type, - .release_port = serial_s3c2410_release_port, - .request_port = serial_s3c2410_request_port, - .config_port = serial_s3c2410_config_port, - .verify_port = serial_s3c2410_verify_port, -}; - -static struct uart_port serial_s3c2410_ports[NR_PORTS] = { - { - .membase = 0, - .mapbase = 0, - .iotype = UPIO_MEM, - .irq = IRQ_S3CUART_RX0, - .uartclk = 0, - .fifosize = 16, - .ops = &serial_s3c2410_ops, - .flags = UPF_BOOT_AUTOCONF, - .line = 0, + +#ifdef CONFIG_SERIAL_S3C2410_CONSOLE + +static struct console s3c24xx_serial_console; + +#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console +#else +#define S3C24XX_SERIAL_CONSOLE NULL +#endif + +static struct uart_ops s3c24xx_serial_ops = { + .pm = s3c24xx_serial_pm, + .tx_empty = s3c24xx_serial_tx_empty, + .get_mctrl = s3c24xx_serial_get_mctrl, + .set_mctrl = s3c24xx_serial_set_mctrl, + .stop_tx = s3c24xx_serial_stop_tx, + .start_tx = s3c24xx_serial_start_tx, + .stop_rx = s3c24xx_serial_stop_rx, + .enable_ms = s3c24xx_serial_enable_ms, + .break_ctl = s3c24xx_serial_break_ctl, + .startup = s3c24xx_serial_startup, + .shutdown = s3c24xx_serial_shutdown, + .set_termios = s3c24xx_serial_set_termios, + .type = s3c24xx_serial_type, + .release_port = s3c24xx_serial_release_port, + .request_port = s3c24xx_serial_request_port, + .config_port = s3c24xx_serial_config_port, + .verify_port = s3c24xx_serial_verify_port, +}; + + +static struct uart_driver s3c24xx_uart_drv = { + .owner = THIS_MODULE, + .dev_name = "s3c2410_serial", + .nr = 3, + .cons = S3C24XX_SERIAL_CONSOLE, + .driver_name = S3C24XX_SERIAL_NAME, + .devfs_name = S3C24XX_SERIAL_DEVFS, + .major = S3C24XX_SERIAL_MAJOR, + .minor = S3C24XX_SERIAL_MINOR, +}; + +static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = { + [0] = { + .port = { + .lock = SPIN_LOCK_UNLOCKED, + .membase = 0, + .mapbase = 0, + .iotype = UPIO_MEM, + .irq = IRQ_S3CUART_RX0, + .uartclk = 0, + .fifosize = 16, + .ops = &s3c24xx_serial_ops, + .flags = UPF_BOOT_AUTOCONF, + .line = 0, + } + }, + [1] = { + .port = { + .lock = SPIN_LOCK_UNLOCKED, + .membase = 0, + .mapbase = 0, + .iotype = UPIO_MEM, + .irq = IRQ_S3CUART_RX1, + .uartclk = 0, + .fifosize = 16, + .ops = &s3c24xx_serial_ops, + .flags = UPF_BOOT_AUTOCONF, + .line = 1, + } }, - { - .membase = 0, - .mapbase = 0, - .iotype = UPIO_MEM, - .irq = IRQ_S3CUART_RX1, - .uartclk = 0, - .fifosize = 16, - .ops = &serial_s3c2410_ops, - .flags = UPF_BOOT_AUTOCONF, - .line = 1, - } #if NR_PORTS > 2 - , - { - .membase = 0, - .mapbase = 0, - .iotype = UPIO_MEM, - .irq = IRQ_S3CUART_RX2, - .uartclk = 0, - .fifosize = 16, - .ops = &serial_s3c2410_ops, - .flags = UPF_BOOT_AUTOCONF, - .line = 2, + + [2] = { + .port = { + .lock = SPIN_LOCK_UNLOCKED, + .membase = 0, + .mapbase = 0, + .iotype = UPIO_MEM, + .irq = IRQ_S3CUART_RX2, + .uartclk = 0, + .fifosize = 16, + .ops = &s3c24xx_serial_ops, + .flags = UPF_BOOT_AUTOCONF, + .line = 2, + } } #endif }; -static int -serial_s3c2410_resetport(struct uart_port *port, - struct s3c2410_uartcfg *cfg) + +static int s3c24xx_serial_resetport(struct uart_port *port, + struct s3c2410_uartcfg *cfg) { /* ensure registers are setup */ - dbg("serial_s3c2410_resetport: port=%p (%08x), cfg=%p\n", + dbg("s3c24xx_serial_resetport: port=%p (%08lx), cfg=%p\n", port, port->mapbase, cfg); wr_regl(port, S3C2410_UCON, cfg->ucon); @@ -520,105 +1011,429 @@ return 0; } -/* serial_s3c2410_init_ports +/* s3c24xx_serial_init_port * - * initialise the serial ports from the machine provided initialisation - * data. -*/ + * initialise a single serial port from the platform device given + */ -static int serial_s3c2410_init_ports(void) +static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, + struct s3c24xx_uart_info *info, + struct platform_device *platdev) { - struct uart_port *ptr = serial_s3c2410_ports; - struct s3c2410_uartcfg *cfg = s3c2410_uartcfgs; - static int inited = 0; - int i; + struct uart_port *port = &ourport->port; + struct s3c2410_uartcfg *cfg; + struct resource *res; + + dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev); + + if (platdev == NULL) + return -ENODEV; - if (inited) + cfg = s3c24xx_dev_to_cfg(&platdev->dev); + + if (port->mapbase != 0) return 0; - inited = 1; - dbg("serial_s3c2410_init_ports: initialising ports...\n"); + if (cfg->hwport > 3) + return -EINVAL; - for (i = 0; i < NR_PORTS; i++, ptr++, cfg++) { + /* setup info for port */ + port->dev = &platdev->dev; + ourport->info = info; - if (cfg->hwport > 3) - continue; + /* copy the info in from provided structure */ + ourport->port.fifosize = info->fifosize; - dbg("serial_s3c2410_init_ports: port %d (hw %d)...\n", - i, cfg->hwport); + dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport); - if (cfg->clock != NULL) - ptr->uartclk = *cfg->clock; + port->uartclk = 1; - switch (cfg->hwport) { - case 0: - ptr->mapbase = S3C2410_PA_UART0; - ptr->membase = (char *)S3C2410_VA_UART0; - ptr->irq = IRQ_S3CUART_RX0; - break; + if (cfg->uart_flags & UPF_CONS_FLOW) { + dbg("s3c24xx_serial_init_port: enabling flow control\n"); + port->flags |= UPF_CONS_FLOW; + } - case 1: - ptr->mapbase = S3C2410_PA_UART1; - ptr->membase = (char *)S3C2410_VA_UART1; - ptr->irq = IRQ_S3CUART_RX1; - break; + /* sort our the physical and virtual addresses for each UART */ - case 2: - ptr->mapbase = S3C2410_PA_UART2; - ptr->membase = (char *)S3C2410_VA_UART2; - ptr->irq = IRQ_S3CUART_RX2; - break; - } + res = platform_get_resource(platdev, IORESOURCE_MEM, 0); + if (res == NULL) { + printk(KERN_ERR "failed to find memory resource for uart\n"); + return -EINVAL; + } + + dbg("resource %p (%lx..%lx)\n", res, res->start, res->end); + + port->mapbase = res->start; + port->membase = (void __iomem *)(res->start - S3C2410_PA_UART); + port->membase += S3C2410_VA_UART; + port->irq = platform_get_irq(platdev, 0); + + ourport->clk = clk_get(&platdev->dev, "uart"); + + if (ourport->clk != NULL && !IS_ERR(ourport->clk)) + clk_use(ourport->clk); + + dbg("port: map=%08x, mem=%08x, irq=%d, clock=%ld\n", + port->mapbase, port->membase, port->irq, port->uartclk); + + /* reset the fifos (and setup the uart) */ + s3c24xx_serial_resetport(port, cfg); + return 0; +} + +/* Device driver serial port probe */ + +static int probe_index = 0; + +int s3c24xx_serial_probe(struct device *_dev, + struct s3c24xx_uart_info *info) +{ + struct s3c24xx_uart_port *ourport; + struct platform_device *dev = to_platform_device(_dev); + int ret; + + dbg("s3c24xx_serial_probe(%p, %p) %d\n", _dev, info, probe_index); + + ourport = &s3c24xx_serial_ports[probe_index]; + probe_index++; + + dbg("%s: initialising port %p...\n", __FUNCTION__, ourport); + + ret = s3c24xx_serial_init_port(ourport, info, dev); + if (ret < 0) + goto probe_err; + + dbg("%s: adding port\n", __FUNCTION__); + uart_add_one_port(&s3c24xx_uart_drv, &ourport->port); + dev_set_drvdata(_dev, &ourport->port); + + return 0; + + probe_err: + return ret; +} + +int s3c24xx_serial_remove(struct device *_dev) +{ + struct uart_port *port = s3c24xx_dev_to_port(_dev); + + if (port) + uart_remove_one_port(&s3c24xx_uart_drv, port); + + return 0; +} + +/* UART power management code */ + +#ifdef CONFIG_PM + +int s3c24xx_serial_suspend(struct device *dev, u32 state, u32 level) +{ + struct uart_port *port = s3c24xx_dev_to_port(dev); + + if (port && level == SUSPEND_DISABLE) + uart_suspend_port(&s3c24xx_uart_drv, port); + + return 0; +} + +int s3c24xx_serial_resume(struct device *dev, u32 level) +{ + struct uart_port *port = s3c24xx_dev_to_port(dev); + struct s3c24xx_uart_port *ourport = to_ourport(port); + + if (port && level == RESUME_ENABLE) { + clk_enable(ourport->clk); + s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port)); + clk_disable(ourport->clk); + + uart_resume_port(&s3c24xx_uart_drv, port); + } + + return 0; +} + +#else +#define s3c24xx_serial_suspend NULL +#define s3c24xx_serial_resume NULL +#endif + +int s3c24xx_serial_init(struct device_driver *drv, + struct s3c24xx_uart_info *info) +{ + dbg("s3c24xx_serial_init(%p,%p)\n", drv, info); + return driver_register(drv); +} + + +/* now comes the code to initialise either the s3c2410 or s3c2440 serial + * port information +*/ + +/* cpu specific variations on the serial port support */ + +#ifdef CONFIG_CPU_S3C2410 + +static int s3c2410_serial_setsource(struct uart_port *port, + struct s3c24xx_uart_clksrc *clk) +{ + unsigned long ucon = rd_regl(port, S3C2410_UCON); + + if (strcmp(clk->name, "uclk") == 0) + ucon |= S3C2410_UCON_UCLK; + else + ucon &= ~S3C2410_UCON_UCLK; + + wr_regl(port, S3C2410_UCON, ucon); + return 0; +} + +static int s3c2410_serial_getsource(struct uart_port *port, + struct s3c24xx_uart_clksrc *clk) +{ + unsigned long ucon = rd_regl(port, S3C2410_UCON); + + clk->divisor = 1; + clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk"; + + return 0; +} + +static struct s3c24xx_uart_info s3c2410_uart_inf = { + .name = "Samsung S3C2410 UART", + .type = PORT_S3C2410, + .fifosize = 16, + .rx_fifomask = S3C2410_UFSTAT_RXMASK, + .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT, + .tx_fifofull = S3C2410_UFSTAT_TXFULL, + .tx_fifomask = S3C2410_UFSTAT_TXMASK, + .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT, + .get_clksrc = s3c2410_serial_getsource, + .set_clksrc = s3c2410_serial_setsource, +}; + +/* device management */ + +static int s3c2410_serial_probe(struct device *dev) +{ + return s3c24xx_serial_probe(dev, &s3c2410_uart_inf); +} + +static struct device_driver s3c2410_serial_drv = { + .name = "s3c2410-uart", + .bus = &platform_bus_type, + .probe = s3c2410_serial_probe, + .remove = s3c24xx_serial_remove, + .suspend = s3c24xx_serial_suspend, + .resume = s3c24xx_serial_resume, +}; + +static inline int s3c2410_serial_init(void) +{ + return s3c24xx_serial_init(&s3c2410_serial_drv, &s3c2410_uart_inf); +} + +static inline void s3c2410_serial_exit(void) +{ + driver_unregister(&s3c2410_serial_drv); +} + +#define s3c2410_uart_inf_at &s3c2410_uart_inf +#else + +static inline int s3c2410_serial_init(void) +{ + return 0; +} + +static inline void s3c2410_serial_exit(void) +{ +} + +#define s3c2410_uart_inf_at NULL + +#endif /* CONFIG_CPU_S3C2410 */ + +#ifdef CONFIG_CPU_S3C2440 + +static int s3c2440_serial_setsource(struct uart_port *port, + struct s3c24xx_uart_clksrc *clk) +{ + unsigned long ucon = rd_regl(port, S3C2410_UCON); + + // todo - proper fclk<>nonfclk switch // + + ucon &= ~S3C2440_UCON_CLKMASK; + + if (strcmp(clk->name, "uclk") == 0) + ucon |= S3C2440_UCON_UCLK; + else if (strcmp(clk->name, "pclk") == 0) + ucon |= S3C2440_UCON_PCLK; + else if (strcmp(clk->name, "fclk") == 0) + ucon |= S3C2440_UCON_FCLK; + else { + printk(KERN_ERR "unknown clock source %s\n", clk->name); + return -EINVAL; + } + + wr_regl(port, S3C2410_UCON, ucon); + return 0; +} + + +static int s3c2440_serial_getsource(struct uart_port *port, + struct s3c24xx_uart_clksrc *clk) +{ + unsigned long ucon = rd_regl(port, S3C2410_UCON); + + switch (ucon & S3C2440_UCON_CLKMASK) { + case S3C2440_UCON_UCLK: + clk->divisor = 1; + clk->name = "uclk"; + break; + + case S3C2440_UCON_PCLK: + case S3C2440_UCON_PCLK2: + clk->divisor = 1; + clk->name = "pclk"; + break; + + case S3C2440_UCON_FCLK: + clk->divisor = 7; /* todo - work out divisor */ + clk->name = "fclk"; + break; + } + + return 0; +} + + +static struct s3c24xx_uart_info s3c2440_uart_inf = { + .name = "Samsung S3C2440 UART", + .type = PORT_S3C2440, + .fifosize = 64, + .rx_fifomask = S3C2440_UFSTAT_RXMASK, + .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, + .tx_fifofull = S3C2440_UFSTAT_TXFULL, + .tx_fifomask = S3C2440_UFSTAT_TXMASK, + .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, + .get_clksrc = s3c2440_serial_getsource, + .set_clksrc = s3c2440_serial_setsource +}; + +/* device management */ + +static int s3c2440_serial_probe(struct device *dev) +{ + dbg("s3c2440_serial_probe: dev=%p\n", dev); + return s3c24xx_serial_probe(dev, &s3c2440_uart_inf); +} + +static struct device_driver s3c2440_serial_drv = { + .name = "s3c2440-uart", + .bus = &platform_bus_type, + .probe = s3c2440_serial_probe, + .remove = s3c24xx_serial_remove, + .suspend = s3c24xx_serial_suspend, + .resume = s3c24xx_serial_resume, +}; + + +static inline int s3c2440_serial_init(void) +{ + return s3c24xx_serial_init(&s3c2440_serial_drv, &s3c2440_uart_inf); +} - if (ptr->mapbase == 0) - continue; +static inline void s3c2440_serial_exit(void) +{ + driver_unregister(&s3c2440_serial_drv); +} + +#define s3c2440_uart_inf_at &s3c2440_uart_inf +#else + +static inline int s3c2440_serial_init(void) +{ + return 0; +} + +static inline void s3c2440_serial_exit(void) +{ +} + +#define s3c2440_uart_inf_at NULL +#endif /* CONFIG_CPU_S3C2440 */ + +/* module initialisation code */ + +static int __init s3c24xx_serial_modinit(void) +{ + int ret; - /* reset the fifos (and setup the uart */ - serial_s3c2410_resetport(ptr, cfg); + ret = uart_register_driver(&s3c24xx_uart_drv); + if (ret < 0) { + printk(KERN_ERR "failed to register UART driver\n"); + return -1; } + s3c2410_serial_init(); + s3c2440_serial_init(); + return 0; } +static void __exit s3c24xx_serial_modexit(void) +{ + s3c2410_serial_exit(); + s3c2440_serial_exit(); + + uart_unregister_driver(&s3c24xx_uart_drv); +} + + +module_init(s3c24xx_serial_modinit); +module_exit(s3c24xx_serial_modexit); + +/* Console code */ + #ifdef CONFIG_SERIAL_S3C2410_CONSOLE static struct uart_port *cons_uart; static int -serial_s3c2410_console_txrdy(struct uart_port *port, unsigned int ufcon) +s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon) { + struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); unsigned long ufstat, utrstat; if (ufcon & S3C2410_UFCON_FIFOMODE) { /* fifo mode - check ammount of data in fifo registers... */ ufstat = rd_regl(port, S3C2410_UFSTAT); - - return S3C2410_UFCON_TXC(ufstat) < 12; + return (ufstat & info->tx_fifofull) ? 0 : 1; } /* in non-fifo mode, we go and use the tx buffer empty */ utrstat = rd_regl(port, S3C2410_UTRSTAT); - - return (utrstat & S3C2410_UTRSTAT_TXFE) ? 1 : 0; + return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0; } static void -serial_s3c2410_console_write(struct console *co, const char *s, +s3c24xx_serial_console_write(struct console *co, const char *s, unsigned int count) { int i; unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON); for (i = 0; i < count; i++) { - while (!serial_s3c2410_console_txrdy(cons_uart, ufcon)) + while (!s3c24xx_serial_console_txrdy(cons_uart, ufcon)) barrier(); wr_regb(cons_uart, S3C2410_UTXH, s[i]); if (s[i] == '\n') { - while (!serial_s3c2410_console_txrdy(cons_uart, ufcon)) + while (!s3c24xx_serial_console_txrdy(cons_uart, ufcon)) barrier(); wr_regb(cons_uart, S3C2410_UTXH, '\r'); @@ -627,17 +1442,21 @@ } static void __init -serial_s3c2410_get_options(struct uart_port *port, int *baud, +s3c24xx_serial_get_options(struct uart_port *port, int *baud, int *parity, int *bits) { - - unsigned int ulcon, ucon, ubrdiv; + struct s3c24xx_uart_clksrc clksrc; + struct clk *clk; + unsigned int ulcon; + unsigned int ucon; + unsigned int ubrdiv; + unsigned long rate; ulcon = rd_regl(port, S3C2410_ULCON); ucon = rd_regl(port, S3C2410_UCON); ubrdiv = rd_regl(port, S3C2410_UBRDIV); - dbg("serial_s3c2410_get_options: port=%p\n" + dbg("s3c24xx_serial_get_options: port=%p\n" "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n", port, ulcon, ucon, ubrdiv); @@ -669,21 +1488,53 @@ *parity = 'o'; break; - default: case S3C2410_LCON_PNONE: + default: *parity = 'n'; } /* now calculate the baud rate */ - *baud = port->uartclk / ( 16 * (ubrdiv + 1)); + s3c24xx_serial_getsource(port, &clksrc); + + clk = clk_get(port->dev, clksrc.name); + if (!IS_ERR(clk) && clk != NULL) + rate = clk_get_rate(clk); + else + rate = 1; + + + *baud = rate / ( 16 * (ubrdiv + 1)); dbg("calculated baud %d\n", *baud); } } +/* s3c24xx_serial_init_ports + * + * initialise the serial ports from the machine provided initialisation + * data. +*/ + +static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info *info) +{ + struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports; + struct platform_device **platdev_ptr; + int i; + + dbg("s3c24xx_serial_init_ports: initialising ports...\n"); + + platdev_ptr = s3c24xx_uart_devs; + + for (i = 0; i < NR_PORTS; i++, ptr++, platdev_ptr++) { + s3c24xx_serial_init_port(ptr, info, *platdev_ptr); + } + + return 0; +} + static int __init -serial_s3c2410_console_setup(struct console *co, char *options) +s3c24xx_serial_console_setup(struct console *co, char *options) { struct uart_port *port; int baud = 9600; @@ -691,23 +1542,26 @@ int parity = 'n'; int flow = 'n'; + dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n", + co, co->index, options); + /* is this a valid port */ if (co->index == -1 || co->index >= NR_PORTS) co->index = 0; - port = &serial_s3c2410_ports[co->index]; + port = &s3c24xx_serial_ports[co->index].port; /* is the port configured? */ if (port->mapbase == 0x0) { co->index = 0; - port = &serial_s3c2410_ports[co->index]; + port = &s3c24xx_serial_ports[co->index].port; } cons_uart = port; - dbg("serial_s3c2410_console_setup: port=%p (%d)\n", port, co->index); + dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index); /* * Check whether an invalid uart number has been specified, and @@ -717,138 +1571,68 @@ if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); else - serial_s3c2410_get_options(port, &baud, &parity, &bits); + s3c24xx_serial_get_options(port, &baud, &parity, &bits); + + dbg("s3c24xx_serial_console_setup: baud %d\n", baud); return uart_set_options(port, co, baud, parity, bits, flow); } -static struct uart_driver s3c2410_uart_drv; +/* s3c24xx_serial_initconsole + * + * initialise the console from one of the uart drivers +*/ -static struct console serial_s3c2410_console = +static struct console s3c24xx_serial_console = { - .name = SERIAL_S3C2410_NAME, - .write = serial_s3c2410_console_write, + .name = S3C24XX_SERIAL_NAME, .device = uart_console_device, - .setup = serial_s3c2410_console_setup, .flags = CON_PRINTBUFFER, .index = -1, - .data = &s3c2410_uart_drv, + .write = s3c24xx_serial_console_write, + .setup = s3c24xx_serial_console_setup }; -static int __init s3c2410_console_init(void) -{ - dbg("s3c2410_console_init:\n"); - - serial_s3c2410_init_ports(); - register_console(&serial_s3c2410_console); - return 0; -} -console_initcall(s3c2410_console_init); - -#define SERIAL_S3C2410_CONSOLE &serial_s3c2410_console -#else -#define SERIAL_S3C2410_CONSOLE NULL -#endif - -static struct uart_driver s3c2410_uart_drv = { - .owner = THIS_MODULE, - .driver_name = SERIAL_S3C2410_NAME, - .dev_name = SERIAL_S3C2410_NAME, - .major = SERIAL_S3C2410_MAJOR, - .minor = SERIAL_S3C2410_MINOR, - .nr = 3, - .cons = SERIAL_S3C2410_CONSOLE, -}; -/* device driver */ - -static int s3c2410_serial_probe(struct device *_dev); -static int s3c2410_serial_remove(struct device *_dev); - -static struct device_driver s3c2410_serial_drv = { - .name = "s3c2410-uart", - .bus = &platform_bus_type, - .probe = s3c2410_serial_probe, - .remove = s3c2410_serial_remove, - .suspend = NULL, - .resume = NULL, -}; - -#define s3c2410_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev) - -static int s3c2410_serial_probe(struct device *_dev) +static int s3c24xx_serial_initconsole(void) { - struct platform_device *dev = to_platform_device(_dev); - struct resource *res = dev->resource; - int i; - - dbg("s3c2410_serial_probe: dev=%p, _dev=%p, res=%p\n", _dev, dev, res); - - for (i = 0; i < dev->num_resources; i++, res++) - if (res->flags & IORESOURCE_MEM) - break; - - if (i < dev->num_resources) { - struct uart_port *ptr = serial_s3c2410_ports; + struct s3c24xx_uart_info *info; + struct platform_device *dev = s3c24xx_uart_devs[0]; - for (i = 0; i < NR_PORTS; i++, ptr++) { - dbg("s3c2410_serial_probe: ptr=%p (%08x, %08x)\n", - ptr, ptr->mapbase, ptr->membase); + dbg("s3c24xx_serial_initconsole\n"); - if (ptr->mapbase != res->start) - continue; - - dbg("s3c2410_serial_probe: got device %p: port=%p\n", - _dev, ptr); + /* select driver based on the cpu */ - uart_add_one_port(&s3c2410_uart_drv, ptr); - dev_set_drvdata(_dev, ptr); - break; - } + if (dev == NULL) { + printk(KERN_ERR "s3c24xx: no devices for console init\n"); + return 0; } - return 0; -} + if (strcmp(dev->name, "s3c2410-uart") == 0) { + info = s3c2410_uart_inf_at; + } else if (strcmp(dev->name, "s3c2440-uart") == 0) { + info = s3c2440_uart_inf_at; + } else { + printk(KERN_ERR "s3c24xx: no driver for %s\n", dev->name); + return 0; + } -static int s3c2410_serial_remove(struct device *_dev) -{ - struct uart_port *port = s3c2410_dev_to_port(_dev); + if (info == NULL) { + printk(KERN_ERR "s3c24xx: no driver for console\n"); + return 0; + } - if (port) - uart_remove_one_port(&s3c2410_uart_drv, port); + s3c24xx_serial_console.data = &s3c24xx_uart_drv; + s3c24xx_serial_init_ports(info); + register_console(&s3c24xx_serial_console); return 0; } +console_initcall(s3c24xx_serial_initconsole); - -static int __init serial_s3c2410_init(void) -{ - int ret; - - printk(KERN_INFO "S3C2410X Serial, (c) 2003 Simtec Electronics\n"); - - ret = uart_register_driver(&s3c2410_uart_drv); - if (ret != 0) - return ret; - - ret = driver_register(&s3c2410_serial_drv); - if (ret) { - uart_unregister_driver(&s3c2410_uart_drv); - } - - return ret; -} - -static void __exit serial_s3c2410_exit(void) -{ - driver_unregister(&s3c2410_serial_drv); - uart_unregister_driver(&s3c2410_uart_drv); -} - -module_init(serial_s3c2410_init); -module_exit(serial_s3c2410_exit); +#endif /* CONFIG_SERIAL_S3C2410_CONSOLE */ MODULE_LICENSE("GPL"); MODULE_AUTHOR("Ben Dooks "); -MODULE_DESCRIPTION("Samsung S3C2410X (S3C2410) Serial driver"); +MODULE_DESCRIPTION("Samsung S3C2410/S3C2440 Serial port driver");