/* * Driver core for Samsung SoC onboard UARTs. * * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics * 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. */ /* 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 */ #if defined(CONFIG_SERIAL_SAMSUNG_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 #include #include "samsung.h" #include "../../pinctrl/core.h" #ifdef CONFIG_CPU_IDLE #include #endif #ifdef CONFIG_PM_DEVFREQ #include #endif #include #include #if defined(CONFIG_SERIAL_SAMSUNG_DEBUG) && \ defined(CONFIG_DEBUG_LL) && \ !defined(MODULE) extern void printascii(const char *); __printf(1, 2) static void dbg(const char *fmt, ...) { va_list va; char buff[256]; va_start(va, fmt); vscnprintf(buff, sizeof(buff), fmt, va); va_end(va); printascii(buff); } #else #define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0) #endif /* UART name and device definitions */ #define S3C24XX_SERIAL_NAME "ttySAC" #define S3C24XX_SERIAL_MAJOR 204 #define S3C24XX_SERIAL_MINOR 64 /* Baudrate definition*/ #define MAX_BAUD 3000000 #define MIN_BAUD 0 #define DEFAULT_SOURCE_CLK 200000000 #if defined(CONFIG_SEC_FACTORY) // SEC_FACTORY #define SERIAL_UART_TRACE 1 #define PROC_SERIAL_DIR "serial/uart" #define SERIAL_UART_PORT_LINE 0 #endif #define LOG_BUFFER_SIZE (0xC8000) /* Allocate 800KB of buffer */ /* 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 coming in */ #define RXSTAT_DUMMY_READ (0x10000000) static LIST_HEAD(drvdata_list); s3c_wake_peer_t s3c2410_serial_wake_peer[CONFIG_SERIAL_SAMSUNG_UARTS]; EXPORT_SYMBOL_GPL(s3c2410_serial_wake_peer); #define UART_LOOPBACK_MODE (0x1 << 0) #define UART_DBG_MODE (0x1 << 1) #define RTS_PINCTRL (1) #define DEFAULT_PINCTRL (0) static void uart_sfr_dump(struct s3c24xx_uart_port *ourport) { struct uart_port *port = &ourport->port; dev_err(ourport->port.dev, " Register dump\n" "ULCON 0x%08x " "UCON 0x%08x " "UFCON 0x%08x \n" "UMCON 0x%08x " "UTRSTAT 0x%08x " "UERSTAT 0x%08x " "UMSTAT 0x%08x \n" "UBRDIV 0x%08x " "UINTP 0x%08x " "UINTM 0x%08x \n" , readl(port->membase + S3C2410_ULCON) , readl(port->membase + S3C2410_UCON) , readl(port->membase + S3C2410_UFCON) , readl(port->membase + S3C2410_UMCON) , readl(port->membase + S3C2410_UTRSTAT) , readl(port->membase + S3C2410_UERSTAT) , readl(port->membase + S3C2410_UMSTAT) , readl(port->membase + S3C2410_UBRDIV) , readl(port->membase + S3C64XX_UINTP) , readl(port->membase + S3C64XX_UINTM) ); } static void change_uart_gpio(int value, struct s3c24xx_uart_port *ourport) { int status = 0; if (value) { if (!IS_ERR(ourport->uart_pinctrl_rts)) { ourport->default_uart_pinctrl->state = NULL; status = pinctrl_select_state(ourport->default_uart_pinctrl, ourport->uart_pinctrl_rts); if (status) dev_err(ourport->port.dev, "Can't set RTS uart pins!!!\n"); } } else { if (!IS_ERR(ourport->uart_pinctrl_default)) { ourport->default_uart_pinctrl->state = NULL; status = pinctrl_select_state(ourport->default_uart_pinctrl, ourport->uart_pinctrl_default); if (status) dev_err(ourport->port.dev, "Can't set default uart pins!!!\n"); } } } static void print_uart_mode(struct uart_port *port, struct ktermios *termios, unsigned int baud) { printk(KERN_ERR "UART port%d configurations\n", port->line); switch (termios->c_cflag & CSIZE) { case CS5: printk(KERN_ERR " - 5bits word length\n"); break; case CS6: printk(KERN_ERR " - 6bits word length\n"); break; case CS7: printk(KERN_ERR " - 7bits word length\n"); break; case CS8: default: printk(KERN_ERR " - 8bits word length\n"); break; } if (termios->c_cflag & CSTOPB) printk(KERN_ERR " - Use TWO stop bit\n"); else printk(KERN_ERR " - Use one stop bit\n"); if (termios->c_cflag & CRTSCTS) printk(KERN_ERR " - Use Autoflow control\n"); printk(KERN_ERR " - Baudrate : %u\n", baud); } static ssize_t uart_dbg_show(struct device *dev, struct device_attribute *attr, char *buf) { ssize_t ret = 0; ret += snprintf(buf + ret, PAGE_SIZE - ret, "UART Debug Mode Configuration.\n"); ret += snprintf(buf + ret, PAGE_SIZE - ret, "0 : Change loopback & DBG mode.\n"); ret += snprintf(buf + ret, PAGE_SIZE - ret, "1 : Change DBG mode.\n"); ret += snprintf(buf + ret, PAGE_SIZE - ret, "2 : Change Normal mode.\n"); if (ret < PAGE_SIZE - 1) { ret += snprintf(buf+ret, PAGE_SIZE-ret, "\n"); } else { buf[PAGE_SIZE-2] = '\n'; buf[PAGE_SIZE-1] = '\0'; ret = PAGE_SIZE-1; } return ret; } static ssize_t uart_dbg_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int input_cmd = 0, ret; struct s3c24xx_uart_port *ourport; ret = sscanf(buf, "%d", &input_cmd); list_for_each_entry(ourport, &drvdata_list, node) { if (&ourport->pdev->dev != dev) continue; switch(input_cmd) { case 0: printk(KERN_ERR "Change UART%d to Loopback(DBG) mode\n", ourport->port.line); ourport->dbg_mode = UART_DBG_MODE | UART_LOOPBACK_MODE; break; case 1: printk(KERN_ERR "Change UART%d to DBG mode\n", ourport->port.line); ourport->dbg_mode = UART_DBG_MODE; break; case 2: printk(KERN_ERR "Change UART%d to normal mode\n", ourport->port.line); ourport->dbg_mode = 0; break; default: printk(KERN_ERR "Wrong Command!(0/1/2)\n"); } } return count; } static DEVICE_ATTR(uart_dbg, 0640, uart_dbg_show, uart_dbg_store); static ssize_t uart_error_cnt_show(struct device *dev, struct device_attribute *attr, char *buf) { int ret = 0; struct s3c24xx_uart_port *ourport; sprintf(buf, "000 000 000 000\n");//init buf : overrun parity frame break count list_for_each_entry(ourport, &drvdata_list, node) { struct uart_port *port = &ourport->port; if (&ourport->pdev->dev != dev) continue; ret = sprintf(buf, "%03x %03x %03x %03x\n", port->icount.overrun, 0, port->icount.frame, port->icount.brk); } return ret; } static DEVICE_ATTR(error_cnt, 0444, uart_error_cnt_show, NULL); struct proc_dir_entry *serial_dir, *serial_log_dir; static void uart_copy_to_local_buf(int dir, struct uart_local_buf *local_buf, unsigned char *trace_buf, int len) { unsigned long long time; unsigned long rem_nsec; int i; int cpu = raw_smp_processor_id(); time = cpu_clock(cpu); rem_nsec = do_div(time, NSEC_PER_SEC); if (local_buf->index + (len * 3 + 30) >= local_buf->size) local_buf->index = 0; local_buf->index += scnprintf(local_buf->buffer + local_buf->index, local_buf->size - local_buf->index, "[%5lu.%06lu] ", (unsigned long)time, rem_nsec / NSEC_PER_USEC); if (dir == 2) { local_buf->index += scnprintf(local_buf->buffer + local_buf->index, local_buf->size - local_buf->index, "[reg] "); local_buf->index += scnprintf(local_buf->buffer + local_buf->index, local_buf->size - local_buf->index, "%s", trace_buf); } else { if (dir == 1) { local_buf->index += scnprintf(local_buf->buffer + local_buf->index, local_buf->size - local_buf->index, "[RX] "); } else { local_buf->index += scnprintf(local_buf->buffer + local_buf->index, local_buf->size - local_buf->index, "[TX] "); } for (i = 0; i < len; i++) { local_buf->index += scnprintf(local_buf->buffer + local_buf->index, local_buf->size - local_buf->index, "%02X ", trace_buf[i]); } } local_buf->index += scnprintf(local_buf->buffer + local_buf->index, local_buf->size - local_buf->index, "\n"); } static void exynos_usi_init(struct uart_port *port); static void exynos_usi_stop(struct uart_port *port); static void s3c24xx_serial_resetport(struct uart_port *port, struct s3c2410_uartcfg *cfg); static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, unsigned int old); static struct uart_driver s3c24xx_uart_drv; static inline void uart_clock_enable(struct s3c24xx_uart_port *ourport) { if (ourport->check_separated_clk) clk_prepare_enable(ourport->separated_clk); clk_prepare_enable(ourport->clk); } static inline void uart_clock_disable(struct s3c24xx_uart_port *ourport) { clk_disable_unprepare(ourport->clk); if (ourport->check_separated_clk) clk_disable_unprepare(ourport->separated_clk); } 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 const 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; } /* * s3c64xx and later SoC's include the interrupt mask and status registers in * the controller itself, unlike the s3c24xx SoC's which have these registers * in the interrupt controller. Check if the port type is s3c64xx or higher. */ static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port) { return to_ourport(port)->info->type == PORT_S3C6400; } 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); } 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 s3c24xx_serial_stop_tx(struct uart_port *port) { struct s3c24xx_uart_port *ourport = to_ourport(port); if (tx_enabled(port)) { if (s3c24xx_serial_has_interrupt_mask(port)) __set_bit(S3C64XX_UINTM_TXD, portaddrl(port, S3C64XX_UINTM)); else disable_irq_nosync(ourport->tx_irq); tx_enabled(port) = 0; if (port->flags & UPF_CONS_FLOW) s3c24xx_serial_rx_enable(port); } } static void s3c24xx_serial_start_tx(struct uart_port *port) { struct s3c24xx_uart_port *ourport = to_ourport(port); if (!tx_enabled(port)) { if (port->flags & UPF_CONS_FLOW) s3c24xx_serial_rx_disable(port); if (s3c24xx_serial_has_interrupt_mask(port)) __clear_bit(S3C64XX_UINTM_TXD, portaddrl(port, S3C64XX_UINTM)); else enable_irq(ourport->tx_irq); tx_enabled(port) = 1; } } static void s3c24xx_serial_stop_rx(struct uart_port *port) { struct s3c24xx_uart_port *ourport = to_ourport(port); if (rx_enabled(port)) { dbg("s3c24xx_serial_stop_rx: port=%p\n", port); if (s3c24xx_serial_has_interrupt_mask(port)) __set_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM)); else disable_irq_nosync(ourport->rx_irq); rx_enabled(port) = 0; } } 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) { struct s3c24xx_uart_port *ourport; if (port->dev == NULL) return NULL; ourport = container_of(port, struct s3c24xx_uart_port, port); return ourport->cfg; } static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport, unsigned long ufstat) { struct s3c24xx_uart_info *info = ourport->info; if (ufstat & info->rx_fifofull) return ourport->port.fifosize; return (ufstat & info->rx_fifomask) >> info->rx_fifoshift; } static int s3c24xx_serial_tx_fifocnt(struct s3c24xx_uart_port *ourport, unsigned long ufstat) { struct s3c24xx_uart_info *info = ourport->info; if (ufstat & info->tx_fifofull) return ourport->port.fifosize; return (ufstat & info->tx_fifomask) >> info->tx_fifoshift; } /* ? - where has parity gone?? */ #define S3C2410_UERSTAT_PARITY (0x1000) static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id) { struct s3c24xx_uart_port *ourport = dev_id; struct uart_port *port = &ourport->port; unsigned int ufcon, ch, flag, ufstat, uerstat; unsigned long flags; int fifocnt = 0; int max_count = port->fifosize; unsigned char insert_buf[256] = {0, }; unsigned int insert_cnt = 0; unsigned char trace_buf[256] = {0, }; int trace_cnt = 0; spin_lock_irqsave(&port->lock, flags); while (max_count-- > 0) { /* * Receive all characters known to be in FIFO * before reading FIFO level again */ if (fifocnt == 0) { ufstat = rd_regl(port, S3C2410_UFSTAT); fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat); if (fifocnt == 0) { wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK); break; } } fifocnt--; 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 = rd_regl(port, S3C2410_UFCON); ufcon |= S3C2410_UFCON_RESETRX; wr_regl(port, S3C2410_UFCON, ufcon); rx_enabled(port) = 1; spin_unlock_irqrestore(&port->lock, flags); goto out; } continue; } } /* insert the character into the buffer */ flag = TTY_NORMAL; port->icount.rx++; if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) { dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n", ch, uerstat); uart_sfr_dump(ourport); /* check for break */ if (uerstat & S3C2410_UERSTAT_BREAK) { dbg("break!\n"); port->icount.brk++; if (uart_handle_break(port)) goto ignore_char; } if (uerstat & S3C2410_UERSTAT_FRAME) { pr_err("[tty] uerstat & S3C2410_UERSTAT_FRAME!\n"); port->icount.frame++; } if (uerstat & S3C2410_UERSTAT_OVERRUN) { pr_err("[tty] uerstat & S3C2410_UERSTAT_OVERRUN!\n"); port->icount.overrun++; } uerstat &= port->read_status_mask; if (uerstat & S3C2410_UERSTAT_BREAK) { pr_err("[tty] uerstat & S3C2410_UERSTAT_BREAK2!\n"); flag = TTY_BREAK; } else if (uerstat & S3C2410_UERSTAT_PARITY) { pr_err("[tty] uerstat & S3C2410_UERSTAT_PARITY!\n"); flag = TTY_PARITY; } else if (uerstat & (S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN)) flag = TTY_FRAME; } if (uart_handle_sysrq_char(port, ch)) goto ignore_char; insert_buf[insert_cnt++] = ch; if (ourport->uart_logging) trace_buf[trace_cnt++] = ch; ignore_char: continue; } if (ourport->uart_logging && trace_cnt) uart_copy_to_local_buf(1, &ourport->uart_local_buf, trace_buf, trace_cnt); spin_unlock_irqrestore(&port->lock, flags); tty_insert_flip_string(&port->state->port, insert_buf, insert_cnt); tty_flip_buffer_push(&port->state->port); flush_workqueue(system_unbound_wq); out: return IRQ_HANDLED; } static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id) { struct s3c24xx_uart_port *ourport = id; struct uart_port *port = &ourport->port; struct circ_buf *xmit = &port->state->xmit; unsigned long flags; int count = port->fifosize; unsigned char trace_buf[256] = {0, }; int trace_cnt = 0; spin_lock_irqsave(&port->lock, flags); if (port->x_char) { wr_regb(port, S3C2410_UTXH, port->x_char); if (ourport->uart_logging) trace_buf[trace_cnt++] = port->x_char; port->icount.tx++; port->x_char = 0; goto out; } /* if there isn't anything more to transmit, or the uart is now * stopped, disable the uart and exit */ if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { s3c24xx_serial_stop_tx(port); goto out; } /* try and drain the buffer... */ while (!uart_circ_empty(xmit) && count-- > 0) { if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull) break; wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]); if (ourport->uart_logging) trace_buf[trace_cnt++] = (unsigned char)xmit->buf[xmit->tail]; xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); port->icount.tx++; } if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) { spin_unlock_irqrestore(&port->lock, flags); uart_write_wakeup(port); spin_lock_irqsave(&port->lock, flags); } if (uart_circ_empty(xmit)) s3c24xx_serial_stop_tx(port); out: if (ourport->uart_logging && trace_cnt) uart_copy_to_local_buf(0, &ourport->uart_local_buf, trace_buf, trace_cnt); wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK); spin_unlock_irqrestore(&port->lock, flags); return IRQ_HANDLED; } #ifdef CONFIG_ARM_EXYNOS_DEVFREQ static void s3c64xx_serial_qos_func(struct work_struct *work) { struct s3c24xx_uart_port *ourport = container_of(work, struct s3c24xx_uart_port, qos_work.work); struct uart_port *port = &ourport->port; if (ourport->mif_qos_val) pm_qos_update_request_timeout(&ourport->s3c24xx_uart_mif_qos, ourport->mif_qos_val, ourport->qos_timeout); if (ourport->cpu_qos_val) pm_qos_update_request_timeout(&ourport->s3c24xx_uart_cpu_qos, ourport->cpu_qos_val, ourport->qos_timeout); if (ourport->uart_irq_affinity) irq_set_affinity(port->irq, cpumask_of(ourport->uart_irq_affinity)); } #endif /* interrupt handler for s3c64xx and later SoC's.*/ static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id) { struct s3c24xx_uart_port *ourport = id; struct uart_port *port = &ourport->port; irqreturn_t ret = IRQ_HANDLED; #ifdef CONFIG_PM_DEVFREQ if ((ourport->mif_qos_val || ourport->cpu_qos_val) && ourport->qos_timeout) schedule_delayed_work(&ourport->qos_work, msecs_to_jiffies(100)); #endif if (rd_regl(port, S3C64XX_UINTP) & S3C64XX_UINTM_RXD_MSK) ret = s3c24xx_serial_rx_chars(irq, id); if (rd_regl(port, S3C64XX_UINTP) & S3C64XX_UINTM_TXD_MSK) ret = s3c24xx_serial_tx_chars(irq, id); return ret; } static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port) { 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 s3c24xx_serial_get_mctrl(struct uart_port *port) { unsigned int umstat = rd_regb(port, S3C2410_UMSTAT); if (umstat & S3C2410_UMSTAT_CTS) return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; else return TIOCM_CAR | TIOCM_DSR; } static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) { unsigned int umcon = rd_regl(port, S3C2410_UMCON); if (mctrl & TIOCM_RTS) umcon |= S3C2410_UMCOM_RTS_LOW; else umcon &= ~S3C2410_UMCOM_RTS_LOW; wr_regl(port, S3C2410_UMCON, umcon); } static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) { unsigned long flags; unsigned int ucon; spin_lock_irqsave(&port->lock, flags); ucon = rd_regl(port, S3C2410_UCON); if (break_state) ucon |= S3C2410_UCON_SBREAK; else ucon &= ~S3C2410_UCON_SBREAK; wr_regl(port, S3C2410_UCON, ucon); spin_unlock_irqrestore(&port->lock, flags); } static void s3c24xx_serial_shutdown(struct uart_port *port) { struct s3c24xx_uart_port *ourport = to_ourport(port); if (ourport->tx_claimed) { if (!s3c24xx_serial_has_interrupt_mask(port)) free_irq(ourport->tx_irq, ourport); tx_enabled(port) = 0; ourport->tx_claimed = 0; } if (ourport->rx_claimed) { if (!s3c24xx_serial_has_interrupt_mask(port)) free_irq(ourport->rx_irq, ourport); ourport->rx_claimed = 0; rx_enabled(port) = 0; } /* Clear pending interrupts and mask all interrupts */ if (s3c24xx_serial_has_interrupt_mask(port)) { free_irq(port->irq, ourport); wr_regl(port, S3C64XX_UINTP, 0xf); wr_regl(port, S3C64XX_UINTM, 0xf); } } static int s3c24xx_serial_startup(struct uart_port *port) { struct s3c24xx_uart_port *ourport = to_ourport(port); int ret; dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n", port, (unsigned long long)port->mapbase, port->membase); ourport->cfg->wake_peer[port->line] = s3c2410_serial_wake_peer[port->line]; rx_enabled(port) = 1; ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0, s3c24xx_serial_portname(port), ourport); if (ret != 0) { dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq); return ret; } ourport->rx_claimed = 1; dbg("requesting tx irq...\n"); tx_enabled(port) = 1; ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0, s3c24xx_serial_portname(port), ourport); if (ret) { dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq); 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 */ return ret; err: s3c24xx_serial_shutdown(port); return ret; } static int s3c64xx_serial_startup(struct uart_port *port) { struct s3c24xx_uart_port *ourport = to_ourport(port); int ret; dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n", port, (unsigned long long)port->mapbase, port->membase); ourport->cfg->wake_peer[port->line] = s3c2410_serial_wake_peer[port->line]; wr_regl(port, S3C64XX_UINTM, 0xf); if (ourport->use_default_irq == 1) ret = devm_request_irq(port->dev, port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED, s3c24xx_serial_portname(port), ourport); else ret = request_threaded_irq(port->irq, NULL, s3c64xx_serial_handle_irq, IRQF_ONESHOT, s3c24xx_serial_portname(port), ourport); if (ret) { dev_err(port->dev, "cannot get irq %d\n", port->irq); return ret; } /* For compatibility with s3c24xx Soc's */ rx_enabled(port) = 1; ourport->rx_claimed = 1; tx_enabled(port) = 0; ourport->tx_claimed = 1; /* Enable Rx Interrupt */ __clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM)); dbg("s3c64xx_serial_startup ok\n"); return ret; } /* power power management control */ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, unsigned int old) { struct s3c24xx_uart_port *ourport = to_ourport(port); unsigned int umcon; switch (level) { case S3C24XX_UART_PORT_SUSPEND: if (!ourport->in_band_wakeup) { /* disable auto flow control & set nRTS for High */ umcon = rd_regl(port, S3C2410_UMCON); umcon &= ~(S3C2410_UMCOM_AFC | S3C2410_UMCOM_RTS_LOW); wr_regl(port, S3C2410_UMCON, umcon); } uart_clock_disable(ourport); break; case S3C24XX_UART_PORT_RESUME: uart_clock_enable(ourport); exynos_usi_init(port); s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port)); break; default: dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level); } } /* 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. * */ #define MAX_CLK_NAME_LENGTH 20 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport, unsigned int req_baud, struct clk **best_clk, unsigned int *clk_num) { struct s3c24xx_uart_info *info = ourport->info; unsigned long rate; unsigned int cnt, baud, quot, clk_sel, best_quot = 0; int calc_deviation, deviation = (1 << 30) - 1; int ret; clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel : ourport->info->def_clk_sel; for (cnt = 0; cnt < info->num_clks; cnt++) { if (!(clk_sel & (1 << cnt))) continue; rate = clk_get_rate(ourport->clk); if (ourport->src_clk_rate && rate != ourport->src_clk_rate) { ret = clk_set_rate(ourport->clk, ourport->src_clk_rate); if (ret < 0) dev_err(&ourport->pdev->dev, "UART clk set failed\n"); rate = clk_get_rate(ourport->clk); } else { ret = clk_set_rate(ourport->clk, ourport->src_clk_rate); if (ret < 0) dev_err(&ourport->pdev->dev, "UART Default clk set failed\n"); rate = clk_get_rate(ourport->clk); } dev_info(&ourport->pdev->dev, " Clock rate : %ld\n", rate); if (!rate) continue; if (ourport->info->has_divslot) { unsigned long div = rate / req_baud; /* The UDIVSLOT register on the newer UARTs allows us to * get a divisor adjustment of 1/16th on the baud clock. * * We don't keep the UDIVSLOT value (the 16ths we * calculated by not multiplying the baud by 16) as it * is easy enough to recalculate. */ quot = div / 16; baud = rate / div; } else { quot = (rate + (8 * req_baud)) / (16 * req_baud); baud = rate / (quot * 16); } quot--; calc_deviation = req_baud - baud; if (calc_deviation < 0) calc_deviation = -calc_deviation; if (calc_deviation < deviation) { *best_clk = ourport->clk; best_quot = quot; *clk_num = cnt; deviation = calc_deviation; } } return best_quot; } /* udivslot_table[] * * This table takes the fractional value of the baud divisor and gives * the recommended setting for the UDIVSLOT register. */ static u16 udivslot_table[16] = { [0] = 0x0000, [1] = 0x0080, [2] = 0x0808, [3] = 0x0888, [4] = 0x2222, [5] = 0x4924, [6] = 0x4A52, [7] = 0x54AA, [8] = 0x5555, [9] = 0xD555, [10] = 0xD5D5, [11] = 0xDDD5, [12] = 0xDDDD, [13] = 0xDFDD, [14] = 0xDFDF, [15] = 0xFFDF, }; static void s3c24xx_serial_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) { struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); struct s3c24xx_uart_port *ourport = to_ourport(port); struct clk *clk = ERR_PTR(-EINVAL); unsigned long flags; unsigned int baud, quot, clk_sel = 0; unsigned int ulcon; unsigned int umcon; unsigned int udivslot = 0; unsigned int real_baud_rd, real_baud_ru = 0; int calc_deviation_rd, calc_deviation_ru = 0; /* * We don't support modem control lines. */ termios->c_cflag &= ~(HUPCL | CMSPAR); termios->c_cflag |= CLOCAL; /* * Ask the core to calculate the divisor for us. */ baud = uart_get_baud_rate(port, termios, old, MIN_BAUD, MAX_BAUD); quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel); if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) quot = port->custom_divisor; if (IS_ERR(clk)) return; /* setting clock for baud rate */ if (ourport->baudclk != clk) { ourport->baudclk = clk; ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0; } if (ourport->info->has_divslot) { unsigned int div = ourport->baudclk_rate / baud; /* * Find udivslot of the lowest error rate * * udivslot cannot be round-up to 0 because quot is fixed */ if((div & 15) != 15) { real_baud_rd = ourport->baudclk_rate / div; real_baud_ru = ourport->baudclk_rate / (div + 1); calc_deviation_rd = baud - real_baud_rd; calc_deviation_ru = baud - real_baud_ru; if(calc_deviation_rd < 0) calc_deviation_rd = -calc_deviation_rd; if(calc_deviation_ru < 0) calc_deviation_ru = -calc_deviation_ru; if(calc_deviation_rd > calc_deviation_ru) div = div + 1; } if (cfg->has_fracval) { udivslot = (div & 15); dbg("fracval = %04x\n", udivslot); } else { udivslot = udivslot_table[div & 15]; dbg("udivslot = %04x (div %d)\n", udivslot, div & 15); } } switch (termios->c_cflag & CSIZE) { case CS5: dbg("config: 5bits/char\n"); ulcon = S3C2410_LCON_CS5; break; case CS6: dbg("config: 6bits/char\n"); ulcon = S3C2410_LCON_CS6; break; case CS7: dbg("config: 7bits/char\n"); ulcon = S3C2410_LCON_CS7; break; case CS8: default: dbg("config: 8bits/char\n"); ulcon = S3C2410_LCON_CS8; break; } /* preserve original lcon IR settings */ if (!ourport->usi_v2) ulcon |= (cfg->ulcon & S3C2410_LCON_IRM); if (termios->c_cflag & CSTOPB) ulcon |= S3C2410_LCON_STOPB; if (termios->c_cflag & PARENB) { if (termios->c_cflag & PARODD) ulcon |= S3C2410_LCON_PODD; else ulcon |= S3C2410_LCON_PEVEN; } else { ulcon |= S3C2410_LCON_PNONE; } spin_lock_irqsave(&port->lock, flags); dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n", ulcon, quot, udivslot); wr_regl(port, S3C2410_ULCON, ulcon); wr_regl(port, S3C2410_UBRDIV, quot); if (ourport->info->has_divslot) wr_regl(port, S3C2443_DIVSLOT, udivslot); port->status &= ~UPSTAT_AUTOCTS; umcon = rd_regl(port, S3C2410_UMCON); if (termios->c_cflag & CRTSCTS) { umcon |= S3C2410_UMCOM_AFC; /* Disable RTS when RX FIFO contains 63 bytes */ umcon &= ~S3C2412_UMCON_AFC_8; port->status = UPSTAT_AUTOCTS; } else { umcon &= ~S3C2410_UMCOM_AFC; } wr_regl(port, S3C2410_UMCON, umcon); dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n", rd_regl(port, S3C2410_ULCON), rd_regl(port, S3C2410_UCON), rd_regl(port, S3C2410_UFCON)); if (ourport->dbg_mode & UART_DBG_MODE) print_uart_mode(port, termios, baud); /* * Update the per-port timeout. */ uart_update_timeout(port, termios->c_cflag, baud); /* * Which character status flags are we interested in? */ port->read_status_mask = S3C2410_UERSTAT_OVERRUN; if (termios->c_iflag & INPCK) port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY; /* * Which character status flags should we ignore? */ port->ignore_status_mask = 0; if (termios->c_iflag & IGNPAR) port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN; if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR) port->ignore_status_mask |= S3C2410_UERSTAT_FRAME; /* * Ignore all characters if CREAD is not set. */ if ((termios->c_cflag & CREAD) == 0) port->ignore_status_mask |= RXSTAT_DUMMY_READ; spin_unlock_irqrestore(&port->lock, flags); } static const char *s3c24xx_serial_type(struct uart_port *port) { switch (port->type) { case PORT_S3C2410: return "S3C2410"; case PORT_S3C2440: return "S3C2440"; case PORT_S3C2412: return "S3C2412"; case PORT_S3C6400: return "S3C6400/10"; default: return NULL; } } #define MAP_SIZE (0x100) static void s3c24xx_serial_release_port(struct uart_port *port) { release_mem_region(port->mapbase, MAP_SIZE); } static int s3c24xx_serial_request_port(struct uart_port *port) { const char *name = s3c24xx_serial_portname(port); return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY; } 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 && s3c24xx_serial_request_port(port) == 0) port->type = info->type; } /* * verify the new serial_struct (for TIOCSSERIAL). */ static int s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser) { struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); if (ser->type != PORT_UNKNOWN && ser->type != info->type) return -EINVAL; return 0; } static void s3c24xx_serial_wake_peer(struct uart_port *port) { struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); if (cfg->wake_peer[port->line]) cfg->wake_peer[port->line](port); } #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE static struct console s3c24xx_serial_console; static int __init s3c24xx_serial_console_init(void) { struct clk *console_clk; char pclk_name[16], sclk_name[16]; snprintf(pclk_name, sizeof(pclk_name), "console-pclk%d", CONFIG_S3C_LOWLEVEL_UART_PORT); snprintf(sclk_name, sizeof(sclk_name), "console-sclk%d", CONFIG_S3C_LOWLEVEL_UART_PORT); pr_info("Enable clock for console to add reference counter\n"); console_clk = clk_get(NULL, pclk_name); if (IS_ERR(console_clk)) { pr_err("Can't get %s!(it's not err)\n", pclk_name); } else { clk_prepare_enable(console_clk); } console_clk = clk_get(NULL, sclk_name); if (IS_ERR(console_clk)) { pr_err("Can't get %s!(it's not err)\n", sclk_name); } else { clk_prepare_enable(console_clk); } register_console(&s3c24xx_serial_console); return 0; } console_initcall(s3c24xx_serial_console_init); #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console #else #define S3C24XX_SERIAL_CONSOLE NULL #endif #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL) static int s3c24xx_serial_get_poll_char(struct uart_port *port); static void s3c24xx_serial_put_poll_char(struct uart_port *port, unsigned char c); #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, .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, .wake_peer = s3c24xx_serial_wake_peer, #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL) .poll_get_char = s3c24xx_serial_get_poll_char, .poll_put_char = s3c24xx_serial_put_poll_char, #endif }; static struct uart_driver s3c24xx_uart_drv = { .owner = THIS_MODULE, .driver_name = "s3c2410_serial", .nr = CONFIG_SERIAL_SAMSUNG_UARTS, .cons = S3C24XX_SERIAL_CONSOLE, .dev_name = S3C24XX_SERIAL_NAME, .major = S3C24XX_SERIAL_MAJOR, .minor = S3C24XX_SERIAL_MINOR, }; #define __PORT_LOCK_UNLOCKED(i) \ __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock) static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = { [0] = { .port = { .lock = __PORT_LOCK_UNLOCKED(0), .iotype = UPIO_MEM, .uartclk = 0, .fifosize = 16, .ops = &s3c24xx_serial_ops, .flags = UPF_BOOT_AUTOCONF, .line = 0, } }, [1] = { .port = { .lock = __PORT_LOCK_UNLOCKED(1), .iotype = UPIO_MEM, .uartclk = 0, .fifosize = 16, .ops = &s3c24xx_serial_ops, .flags = UPF_BOOT_AUTOCONF, .line = 1, } }, #if CONFIG_SERIAL_SAMSUNG_UARTS > 2 [2] = { .port = { .lock = __PORT_LOCK_UNLOCKED(2), .iotype = UPIO_MEM, .uartclk = 0, .fifosize = 16, .ops = &s3c24xx_serial_ops, .flags = UPF_BOOT_AUTOCONF, .line = 2, } }, #endif #if CONFIG_SERIAL_SAMSUNG_UARTS > 3 [3] = { .port = { .lock = __PORT_LOCK_UNLOCKED(3), .iotype = UPIO_MEM, .uartclk = 0, .fifosize = 16, .ops = &s3c24xx_serial_ops, .flags = UPF_BOOT_AUTOCONF, .line = 3, } }, #endif #if CONFIG_SERIAL_SAMSUNG_UARTS > 4 [4] = { .port = { .lock = __PORT_LOCK_UNLOCKED(4), .iotype = UPIO_MEM, .uartclk = 0, .fifosize = 16, .ops = &s3c24xx_serial_ops, .flags = UPF_BOOT_AUTOCONF, .line = 4, } }, #endif #if CONFIG_SERIAL_SAMSUNG_UARTS > 5 [5] = { .port = { .lock = __PORT_LOCK_UNLOCKED(5), .iotype = UPIO_MEM, .uartclk = 0, .fifosize = 16, .ops = &s3c24xx_serial_ops, .flags = UPF_BOOT_AUTOCONF, .line = 5, } }, #endif }; static struct s3c24xx_uart_port *exynos_serial_default_port(int port_index) { s3c24xx_serial_ports[port_index].port.lock = __PORT_LOCK_UNLOCKED(port_index); s3c24xx_serial_ports[port_index].port.iotype = UPIO_MEM; s3c24xx_serial_ports[port_index].port.uartclk = 0; s3c24xx_serial_ports[port_index].port.fifosize = 0; s3c24xx_serial_ports[port_index].port.ops = &s3c24xx_serial_ops; s3c24xx_serial_ports[port_index].port.flags = UPF_BOOT_AUTOCONF; s3c24xx_serial_ports[port_index].port.line = port_index; return &s3c24xx_serial_ports[port_index]; } #undef __PORT_LOCK_UNLOCKED static void exynos_usi_init(struct uart_port *port) { /* USI_RESET is active High signal. * Reset value of USI_RESET is 'h1 to drive stable value to PAD. * Due to this feature, the USI_RESET must be cleared (set as '0') * before transaction starts. */ wr_regl(port, USI_CON, USI_SET_RESET); udelay(1); wr_regl(port, USI_CON, USI_RESET); udelay(1); /* set the HWACG option bit in case of UART Rx mode. * CLKREQ_ON = 1, CLKSTOP_ON = 0 (set USI_OPTION[2:1] = 2'h1) */ wr_regl(port, USI_OPTION, USI_HWACG_CLKREQ_ON); } static void exynos_usi_stop(struct uart_port *port) { /* when USI CLKSTOP_ON is set high, this makes the * Q-ch state enter into STOP state by driving both the * IP_CLKREQ and IP_BUSACTREQ as low */ wr_regl(port, USI_OPTION, USI_HWACG_CLKSTOP_ON); } /* s3c24xx_serial_resetport * * reset the fifos and other the settings. */ static void s3c24xx_serial_resetport(struct uart_port *port, struct s3c2410_uartcfg *cfg) { struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); struct s3c24xx_uart_port *ourport = to_ourport(port); unsigned long ucon = rd_regl(port, S3C2410_UCON); unsigned int ucon_mask; ucon_mask = info->clksel_mask; if (info->type == PORT_S3C2440) ucon_mask |= S3C2440_UCON0_DIVMASK; ucon &= ucon_mask; if (ourport->dbg_mode & UART_LOOPBACK_MODE) { dev_err(port->dev, "Change Loopback mode!\n"); ucon |= S3C2443_UCON_LOOPBACK; } /* To prevent unexpected Interrupt before enabling the channel */ wr_regl(port, S3C64XX_UINTM, 0xf); /* reset both fifos */ wr_regl(port, S3C2410_UFCON, cfg->ufcon); /* some delay is required after fifo reset */ udelay(1); wr_regl(port, S3C2410_UCON, ucon | cfg->ucon); } /* s3c24xx_serial_init_port * * initialise a single serial port from the platform device given */ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, struct platform_device *platdev) { struct uart_port *port = &ourport->port; struct s3c2410_uartcfg *cfg = ourport->cfg; struct resource *res; char clkname[MAX_CLK_NAME_LENGTH]; int ret; dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev); if (platdev == NULL) return -ENODEV; if (port->mapbase != 0) return -EINVAL; /* setup info for port */ port->dev = &platdev->dev; ourport->pdev = platdev; /* Startup sequence is different for s3c64xx and higher SoC's */ if (s3c24xx_serial_has_interrupt_mask(port)) s3c24xx_serial_ops.startup = s3c64xx_serial_startup; port->uartclk = 1; if (cfg->uart_flags & UPF_CONS_FLOW) { dbg("s3c24xx_serial_init_port: enabling flow control\n"); port->flags |= UPF_CONS_FLOW; } /* sort our the physical and virtual addresses for each UART */ res = platform_get_resource(platdev, IORESOURCE_MEM, 0); if (res == NULL) { dev_err(port->dev, "failed to find memory resource for uart\n"); return -EINVAL; } dbg("resource %pR)\n", res); port->membase = devm_ioremap(port->dev, res->start, resource_size(res)); if (!port->membase) { dev_err(port->dev, "failed to remap controller address\n"); return -EBUSY; } port->mapbase = res->start; ret = platform_get_irq(platdev, 0); if (ret < 0) port->irq = 0; else { port->irq = ret; ourport->rx_irq = ret; ourport->tx_irq = ret + 1; } ret = platform_get_irq(platdev, 1); if (ret > 0) ourport->tx_irq = ret; if (of_get_property(platdev->dev.of_node, "samsung,separate-uart-clk", NULL)) ourport->check_separated_clk = 1; else ourport->check_separated_clk = 0; if (of_property_read_u32(platdev->dev.of_node, "samsung,source-clock-rate", &ourport->src_clk_rate)){ dev_err(&platdev->dev, "No explicit src-clk. Use default src-clk\n"); ourport->src_clk_rate = DEFAULT_SOURCE_CLK; } snprintf(clkname, sizeof(clkname), "ipclk_uart%d", ourport->port.line); ourport->clk = devm_clk_get(&platdev->dev, clkname); if (IS_ERR(ourport->clk)) { pr_err("%s: Controller clock not found\n", dev_name(&platdev->dev)); return PTR_ERR(ourport->clk); } if (ourport->check_separated_clk) { snprintf(clkname, sizeof(clkname), "gate_uart_clk%d", ourport->port.line); ourport->separated_clk = devm_clk_get(&platdev->dev, clkname); if (IS_ERR(ourport->separated_clk)) { pr_err("%s: Controller clock not found\n", dev_name(&platdev->dev)); return PTR_ERR(ourport->separated_clk); } ret = clk_prepare_enable(ourport->separated_clk); if (ret) { pr_err("uart: clock failed to prepare+enable: %d\n", ret); return ret; } } ret = clk_prepare_enable(ourport->clk); if (ret) { pr_err("uart: clock failed to prepare+enable: %d\n", ret); return ret; } exynos_usi_init(port); /* Keep all interrupts masked and cleared */ if (s3c24xx_serial_has_interrupt_mask(port)) { wr_regl(port, S3C64XX_UINTM, 0xf); wr_regl(port, S3C64XX_UINTP, 0xf); wr_regl(port, S3C64XX_UINTSP, 0xf); } dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n", &port->mapbase, port->membase, port->irq, ourport->rx_irq, ourport->tx_irq, port->uartclk); /* reset the fifos (and setup the uart) */ s3c24xx_serial_resetport(port, cfg); return 0; } #ifdef CONFIG_SAMSUNG_CLOCK static ssize_t s3c24xx_serial_show_clksrc(struct device *dev, struct device_attribute *attr, char *buf) { struct uart_port *port = s3c24xx_dev_to_port(dev); struct s3c24xx_uart_port *ourport = to_ourport(port); if (IS_ERR(ourport->baudclk)) return -EINVAL; return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->baudclk->name ?: "(null)"); } static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL); #endif /* Device driver serial port probe */ static const struct of_device_id s3c24xx_uart_dt_match[]; static int probe_index; static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data( struct platform_device *pdev) { #ifdef CONFIG_OF if (pdev->dev.of_node) { const struct of_device_id *match; match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node); return (struct s3c24xx_serial_drv_data *)match->data; } #endif return (struct s3c24xx_serial_drv_data *) platform_get_device_id(pdev)->driver_data; } void s3c24xx_serial_rx_fifo_wait(void) { struct s3c24xx_uart_port *ourport; struct uart_port *port; unsigned int fifo_stat; unsigned long wait_time; unsigned int fifo_count; fifo_count = 0; list_for_each_entry(ourport, &drvdata_list, node) { if (ourport->port.line != CONFIG_S3C_LOWLEVEL_UART_PORT) continue; port = &ourport->port; fifo_stat = rd_regl(port, S3C2410_UFSTAT); fifo_count = s3c24xx_serial_rx_fifocnt(ourport, fifo_stat); if (fifo_count) { uart_clock_enable(ourport); __clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM)); uart_clock_disable(ourport); rx_enabled(port) = 1; } wait_time = jiffies + HZ; do { port = &ourport->port; fifo_stat = rd_regl(port, S3C2410_UFSTAT); cpu_relax(); } while (s3c24xx_serial_rx_fifocnt(ourport, fifo_stat) && time_before(jiffies, wait_time)); if (rx_enabled(port)) s3c24xx_serial_stop_rx(port); } } EXPORT_SYMBOL_GPL(s3c24xx_serial_rx_fifo_wait); void s3c24xx_serial_fifo_wait(void) { struct s3c24xx_uart_port *ourport; struct uart_port *port; unsigned int fifo_stat; unsigned long wait_time; list_for_each_entry(ourport, &drvdata_list, node) { if (ourport->port.line != CONFIG_S3C_LOWLEVEL_UART_PORT) continue; wait_time = jiffies + HZ / 4; do { port = &ourport->port; fifo_stat = rd_regl(port, S3C2410_UFSTAT); cpu_relax(); } while (s3c24xx_serial_tx_fifocnt(ourport, fifo_stat) && time_before(jiffies, wait_time)); } } EXPORT_SYMBOL_GPL(s3c24xx_serial_fifo_wait); #if defined(SERIAL_UART_TRACE) #define PT_L(x) x ? "BT" : "UART" static void s3c24xx_print_reg_status(struct s3c24xx_uart_port *ourport) { struct uart_port *port = &ourport->port; unsigned int ulcon = rd_regl(port, S3C2410_ULCON); unsigned int ucon = rd_regl(port, S3C2410_UCON); unsigned int ufcon = rd_regl(port, S3C2410_UFCON); unsigned int umcon = rd_regl(port, S3C2410_UMCON); unsigned int utrstat = rd_regl(port, S3C2410_UTRSTAT); unsigned int ufstat = rd_regl(port, S3C2410_UFSTAT); unsigned int umstat = rd_regl(port, S3C2410_UMSTAT); unsigned int uerstat = rd_regl(port, S3C2410_UERSTAT); int tx_fifo_full = ufstat & S5PV210_UFSTAT_TXFULL; int tx_fifo_count = s3c24xx_serial_tx_fifocnt(ourport, ufstat); int rx_fifo_full = ufstat & S5PV210_UFSTAT_RXFULL; int rx_fifo_count = s3c24xx_serial_rx_fifocnt(ourport, ufstat); pr_err("[%s]: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n, umcon = 0x%08x\n", PT_L(port->line), ulcon, ucon, ufcon, umcon); pr_err("[%s]: utrstat = 0x%08x, ufstat = 0x%08x, umstat = 0x%08x\n", PT_L(port->line), utrstat, ufstat, umstat); pr_err("[%s]: uerstat = 0x%08x\n", PT_L(port->line), uerstat); pr_err("[%s]: tx_fifo_full = %d, tx_fifo_count = %d\n", PT_L(port->line), tx_fifo_full, tx_fifo_count); pr_err("[%s]: rx_fifo_full = %d, rx_fifo_count = %d\n", PT_L(port->line), rx_fifo_full, rx_fifo_count); } static ssize_t s3c24xx_serial_uart_log(struct file *file, char __user *userbuf, size_t bytes, loff_t *off) { int ret; struct s3c24xx_uart_port *ourport = &s3c24xx_serial_ports[SERIAL_UART_PORT_LINE]; static int copied_bytes; if (copied_bytes >= LOG_BUFFER_SIZE) { struct uart_port *port; port = &ourport->port; copied_bytes = 0; if (port && port->state->pm_state == UART_PM_STATE_ON) s3c24xx_print_reg_status(ourport); return 0; } if (copied_bytes + bytes < LOG_BUFFER_SIZE) { ret = copy_to_user(userbuf, ourport->uart_local_buf.buffer+copied_bytes, bytes); if (ret) { pr_err("Failed to s3c24xx_serial_serial_log : %d\n", (int)ret); return ret; } copied_bytes += bytes; return bytes; } else { int byte_to_read = LOG_BUFFER_SIZE-copied_bytes; ret = copy_to_user(userbuf, ourport->uart_local_buf.buffer+copied_bytes, byte_to_read); if (ret) { pr_err("Failed to s3c24xx_serial_log : %d\n", (int)ret); return ret; } copied_bytes += byte_to_read; return byte_to_read; } return 0; } static const struct file_operations proc_fops_serial_log = { .owner = THIS_MODULE, .read = s3c24xx_serial_uart_log, }; #endif #ifdef CONFIG_CPU_IDLE static int s3c24xx_serial_notifier(struct notifier_block *self, unsigned long cmd, void *v) { struct s3c24xx_uart_port *ourport; struct uart_port *port; unsigned long flags; unsigned int umcon; switch (cmd) { case LPA_ENTER: s3c24xx_serial_fifo_wait(); break; case SICD_ENTER: case SICD_AUD_ENTER: list_for_each_entry(ourport, &drvdata_list, node) { if (ourport->port.line == CONFIG_S3C_LOWLEVEL_UART_PORT) continue; port = &ourport->port; if (port->state->pm_state == UART_PM_STATE_OFF) continue; spin_lock_irqsave(&port->lock, flags); /* disable auto flow control & set nRTS for High */ umcon = rd_regl(port, S3C2410_UMCON); umcon &= ~(S3C2410_UMCOM_AFC | S3C2410_UMCOM_RTS_LOW); wr_regl(port, S3C2410_UMCON, umcon); spin_unlock_irqrestore(&port->lock, flags); if (ourport->rts_control) change_uart_gpio(RTS_PINCTRL, ourport); } s3c24xx_serial_fifo_wait(); break; case SICD_EXIT: case SICD_AUD_EXIT: list_for_each_entry(ourport, &drvdata_list, node) { if (ourport->port.line == CONFIG_S3C_LOWLEVEL_UART_PORT) continue; port = &ourport->port; if (port->state->pm_state == UART_PM_STATE_OFF) continue; spin_lock_irqsave(&port->lock, flags); /* enable auto flow control */ umcon = rd_regl(port, S3C2410_UMCON); umcon |= S3C2410_UMCOM_AFC; wr_regl(port, S3C2410_UMCON, umcon); spin_unlock_irqrestore(&port->lock, flags); if (ourport->rts_control) change_uart_gpio(DEFAULT_PINCTRL, ourport); } break; default: break; } return NOTIFY_DONE; } static struct notifier_block s3c24xx_serial_notifier_block = { .notifier_call = s3c24xx_serial_notifier, }; #endif static int s3c24xx_serial_probe(struct platform_device *pdev) { struct s3c24xx_uart_port *ourport; int index = probe_index; int ret, fifo_size; int port_index = probe_index; dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index); if (pdev->dev.of_node) { ret = of_alias_get_id(pdev->dev.of_node, "uart"); if (ret < 0) { dev_err(&pdev->dev, "UART aliases are not defined(%d).\n", ret); } else { port_index = ret; } } ourport = &s3c24xx_serial_ports[port_index]; if (ourport->port.line != port_index) ourport = exynos_serial_default_port(port_index); if (ourport->port.line >= CONFIG_SERIAL_SAMSUNG_UARTS) { dev_err(&pdev->dev, "the port %d exceeded CONFIG_SERIAL_SAMSUNG_UARTS(%d)\n" , ourport->port.line, CONFIG_SERIAL_SAMSUNG_UARTS); return -EINVAL; } ourport->drv_data = s3c24xx_get_driver_data(pdev); if (!ourport->drv_data) { dev_err(&pdev->dev, "could not find driver data\n"); return -ENODEV; } ourport->baudclk = ERR_PTR(-EINVAL); ourport->info = ourport->drv_data->info; ourport->cfg = (dev_get_platdata(&pdev->dev)) ? dev_get_platdata(&pdev->dev) : ourport->drv_data->def_cfg; ourport->port.fifosize = (ourport->info->fifosize) ? ourport->info->fifosize : ourport->drv_data->fifosize[port_index]; if (of_get_property(pdev->dev.of_node, "samsung,usi-serial-v2", NULL)) ourport->usi_v2 = 1; else ourport->usi_v2 = 0; if (of_get_property(pdev->dev.of_node, "samsung,rts-gpio-control", NULL)) { ourport->rts_control = 1; ourport->default_uart_pinctrl = devm_pinctrl_get(&pdev->dev); if (IS_ERR(ourport->default_uart_pinctrl)) dev_err(&pdev->dev, "Can't get uart pinctrl!!!\n"); else { ourport->uart_pinctrl_rts = pinctrl_lookup_state(ourport->default_uart_pinctrl, "rts"); if (IS_ERR(ourport->uart_pinctrl_rts)) dev_err(&pdev->dev, "Can't get RTS pinstate!!!\n"); ourport->uart_pinctrl_default = pinctrl_lookup_state(ourport->default_uart_pinctrl, "default"); if (IS_ERR(ourport->uart_pinctrl_default)) dev_err(&pdev->dev, "Can't get Default pinstate!!!\n"); } } if (!of_property_read_u32(pdev->dev.of_node, "samsung,fifo-size", &fifo_size)) { ourport->port.fifosize = fifo_size; ourport->info->fifosize = fifo_size; } else { dev_err(&pdev->dev, "Please add FIFO size in device tree!(UART%d)\n", port_index); return -EINVAL; } probe_index++; dbg("%s: initialising port %p...\n", __func__, ourport); #ifdef CONFIG_ARM_EXYNOS_DEVFREQ if (of_property_read_u32(pdev->dev.of_node, "mif_qos_val", &ourport->mif_qos_val)) ourport->mif_qos_val = 0; if (of_property_read_u32(pdev->dev.of_node, "cpu_qos_val", &ourport->cpu_qos_val)) ourport->cpu_qos_val = 0; if (of_property_read_u32(pdev->dev.of_node, "irq_affinity", &ourport->uart_irq_affinity)) ourport->uart_irq_affinity = 0; if (of_property_read_u64(pdev->dev.of_node, "qos_timeout", (u64 *)&ourport->qos_timeout)) ourport->qos_timeout = 0; if ((ourport->mif_qos_val || ourport->cpu_qos_val) && ourport->qos_timeout) { INIT_DELAYED_WORK(&ourport->qos_work, s3c64xx_serial_qos_func); /* request pm qos */ if (ourport->mif_qos_val) pm_qos_add_request(&ourport->s3c24xx_uart_mif_qos, PM_QOS_BUS_THROUGHPUT, 0); if (ourport->cpu_qos_val) pm_qos_add_request(&ourport->s3c24xx_uart_cpu_qos, PM_QOS_CLUSTER1_FREQ_MIN, 0); } #endif if (of_get_property(pdev->dev.of_node, "samsung,in-band-wakeup", NULL)) ourport->in_band_wakeup = 1; else ourport->in_band_wakeup = 0; if (of_get_property(pdev->dev.of_node, "samsung,uart-logging", NULL)) ourport->uart_logging = 1; else ourport->uart_logging = 0; if (of_find_property(pdev->dev.of_node, "samsung,use-default-irq", NULL)) ourport->use_default_irq =1; else ourport->use_default_irq =0; ret = s3c24xx_serial_init_port(ourport, pdev); if (ret < 0) return ret; if (ourport->uart_logging == 1) { /* Allocate memory for UART logging */ ourport->uart_local_buf.buffer = kzalloc(LOG_BUFFER_SIZE, GFP_KERNEL); if (!ourport->uart_local_buf.buffer) dev_err(&pdev->dev, "could not allocate buffer for UART logging\n"); ourport->uart_local_buf.size = LOG_BUFFER_SIZE; ourport->uart_local_buf.index = 0; #ifdef BT_UART_TRACE if (port_index == BLUETOOTH_UART_PORT_LINE) { struct proc_dir_entry *ent; bluetooth_dir = proc_mkdir("bluetooth", NULL); if (bluetooth_dir == NULL) { pr_err("Unable to create /proc/bluetooth directory\n"); return -ENOMEM; } bt_log_dir = proc_mkdir("uart", bluetooth_dir); if (bt_log_dir == NULL) { pr_err("Unable to create /proc/%s directory\n", PROC_DIR); return -ENOMEM; } ent = proc_create("log", 0440, bt_log_dir, &proc_fops_btlog); if (ent == NULL) { pr_err("Unable to create /proc/%s/log entry\n", PROC_DIR); return -ENOMEM; } } #endif #ifdef SERIAL_UART_TRACE if (port_index == SERIAL_UART_PORT_LINE) { struct proc_dir_entry *uent; serial_dir = proc_mkdir("serial", NULL); if (serial_dir == NULL) { pr_err("Unable to create /proc/serial directory\n"); return -ENOMEM; } serial_log_dir = proc_mkdir("uart", serial_dir); if (serial_log_dir == NULL) { pr_err("Unable to create /proc/%s directory\n", PROC_SERIAL_DIR); return -ENOMEM; } uent = proc_create("log", 0444, serial_log_dir, &proc_fops_serial_log); if (uent == NULL) { pr_err("Unable to create /proc/%s/log entry\n", PROC_SERIAL_DIR); return -ENOMEM; } } #endif } dbg("%s: adding port\n", __func__); uart_add_one_port(&s3c24xx_uart_drv, &ourport->port); platform_set_drvdata(pdev, &ourport->port); /* * Deactivate the clock enabled in s3c24xx_serial_init_port here, * so that a potential re-enablement through the pm-callback overlaps * and keeps the clock enabled in this case. */ uart_clock_disable(ourport); #ifdef CONFIG_SAMSUNG_CLOCK ret = device_create_file(&pdev->dev, &dev_attr_clock_source); if (ret < 0) dev_err(&pdev->dev, "failed to add clock source attr.\n"); #endif list_add_tail(&ourport->node, &drvdata_list); ret = device_create_file(&pdev->dev, &dev_attr_uart_dbg); if (ret < 0) dev_err(&pdev->dev, "failed to create sysfs file.\n"); ret = device_create_file(&pdev->dev, &dev_attr_error_cnt); if (ret < 0) dev_err(&pdev->dev, "failed to create sysfs file.\n"); ourport->dbg_mode = 0; return 0; } static int s3c24xx_serial_remove(struct platform_device *dev) { struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); #ifdef CONFIG_PM_DEVFREQ struct s3c24xx_uart_port *ourport = to_ourport(port); if (ourport->mif_qos_val && ourport->qos_timeout) pm_qos_remove_request(&ourport->s3c24xx_uart_mif_qos); if (ourport->cpu_qos_val && ourport->qos_timeout) pm_qos_remove_request(&ourport->s3c24xx_uart_cpu_qos); #endif if (port) { device_remove_file(&dev->dev, &dev_attr_error_cnt); #ifdef CONFIG_SAMSUNG_CLOCK device_remove_file(&dev->dev, &dev_attr_clock_source); #endif if (ourport->uart_logging == 1) { kfree(ourport->uart_local_buf.buffer); } uart_remove_one_port(&s3c24xx_uart_drv, port); } uart_unregister_driver(&s3c24xx_uart_drv); return 0; } /* UART power management code */ #ifdef CONFIG_PM_SLEEP static int s3c24xx_serial_suspend(struct device *dev) { struct uart_port *port = s3c24xx_dev_to_port(dev); struct s3c24xx_uart_port *ourport = to_ourport(port); #ifdef CONFIG_SERIAL_SAMSUNG_HWACG unsigned int ucon; #endif if (port) { /* * If rts line must be protected while suspending * we change the gpio pad as output high */ if (ourport->rts_control) change_uart_gpio(RTS_PINCTRL, ourport); udelay(300);//dealy for sfr update s3c24xx_serial_rx_fifo_wait(); uart_suspend_port(&s3c24xx_uart_drv, port); #ifdef CONFIG_SERIAL_SAMSUNG_HWACG uart_clock_enable(ourport); /* disable Tx, Rx mode bit for suspend in case of HWACG */ ucon = rd_regl(port, S3C2410_UCON); ucon &= ~(S3C2410_UCON_RXIRQMODE | S3C2410_UCON_TXIRQMODE); wr_regl(port, S3C2410_UCON, ucon); exynos_usi_stop(port); uart_clock_disable(ourport); rx_enabled(port) = 0; tx_enabled(port) = 0; #endif if (ourport->dbg_mode & UART_DBG_MODE) dev_err(dev, "UART suspend notification for tty framework.\n"); } return 0; } static int s3c24xx_serial_resume(struct device *dev) { struct uart_port *port = s3c24xx_dev_to_port(dev); struct s3c24xx_uart_port *ourport = to_ourport(port); if (port) { uart_resume_port(&s3c24xx_uart_drv, port); if (ourport->rts_control) change_uart_gpio(DEFAULT_PINCTRL, ourport); if (ourport->dbg_mode & UART_DBG_MODE) dev_err(dev, "UART resume notification for tty framework.\n"); } return 0; } static int s3c24xx_serial_resume_noirq(struct device *dev) { struct uart_port *port = s3c24xx_dev_to_port(dev); struct s3c24xx_uart_port *ourport = to_ourport(port); if (port) { /* restore IRQ mask */ if (s3c24xx_serial_has_interrupt_mask(port)) { unsigned int uintm = 0xf; if (tx_enabled(port)) uintm &= ~S3C64XX_UINTM_TXD_MSK; if (rx_enabled(port)) uintm &= ~S3C64XX_UINTM_RXD_MSK; uart_clock_enable(ourport); wr_regl(port, S3C64XX_UINTM, uintm); uart_clock_disable(ourport); } } return 0; } static const struct dev_pm_ops s3c24xx_serial_pm_ops = { .suspend = s3c24xx_serial_suspend, .resume = s3c24xx_serial_resume, .resume_noirq = s3c24xx_serial_resume_noirq, }; #define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops) #else /* !CONFIG_PM_SLEEP */ #define SERIAL_SAMSUNG_PM_OPS NULL #endif /* CONFIG_PM_SLEEP */ /* Console code */ #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE static struct uart_port *cons_uart; static int 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 amount of data in fifo registers... */ ufstat = rd_regl(port, S3C2410_UFSTAT); 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_TXE) ? 1 : 0; } static bool s3c24xx_port_configured(unsigned int ucon) { /* consider the serial port configured if the tx/rx mode set */ return (ucon & 0xf) != 0; } #ifdef CONFIG_CONSOLE_POLL /* * Console polling routines for writing and reading from the uart while * in an interrupt or debug context. */ static int s3c24xx_serial_get_poll_char(struct uart_port *port) { struct s3c24xx_uart_port *ourport = to_ourport(port); unsigned int ufstat; ufstat = rd_regl(port, S3C2410_UFSTAT); if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0) return NO_POLL_CHAR; return rd_regb(port, S3C2410_URXH); } static void s3c24xx_serial_put_poll_char(struct uart_port *port, unsigned char c) { unsigned int ufcon = rd_regl(port, S3C2410_UFCON); unsigned int ucon = rd_regl(port, S3C2410_UCON); /* not possible to xmit on unconfigured port */ if (!s3c24xx_port_configured(ucon)) return; while (!s3c24xx_serial_console_txrdy(port, ufcon)) cpu_relax(); wr_regb(port, S3C2410_UTXH, c); } #endif /* CONFIG_CONSOLE_POLL */ static void s3c24xx_serial_console_putchar(struct uart_port *port, int ch) { unsigned int ufcon = rd_regl(port, S3C2410_UFCON); while (!s3c24xx_serial_console_txrdy(port, ufcon)) cpu_relax(); wr_regb(port, S3C2410_UTXH, ch); } static void s3c24xx_serial_console_write(struct console *co, const char *s, unsigned int count) { unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON); /* not possible to xmit on unconfigured port */ if (!s3c24xx_port_configured(ucon)) return; uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar); } static void __init s3c24xx_serial_get_options(struct uart_port *port, int *baud, int *parity, int *bits) { struct s3c24xx_uart_port *ourport = to_ourport(port); unsigned int ulcon; unsigned int ucon; unsigned int ubrdiv; unsigned long rate; int ret; ulcon = rd_regl(port, S3C2410_ULCON); ucon = rd_regl(port, S3C2410_UCON); ubrdiv = rd_regl(port, S3C2410_UBRDIV); dbg("s3c24xx_serial_get_options: port=%p\n" "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n", port, ulcon, ucon, ubrdiv); if (s3c24xx_port_configured(ucon)) { switch (ulcon & S3C2410_LCON_CSMASK) { case S3C2410_LCON_CS5: *bits = 5; break; case S3C2410_LCON_CS6: *bits = 6; break; case S3C2410_LCON_CS7: *bits = 7; break; case S3C2410_LCON_CS8: default: *bits = 8; break; } switch (ulcon & S3C2410_LCON_PMASK) { case S3C2410_LCON_PEVEN: *parity = 'e'; break; case S3C2410_LCON_PODD: *parity = 'o'; break; case S3C2410_LCON_PNONE: default: *parity = 'n'; } /* now calculate the baud rate */ rate = clk_get_rate(ourport->clk); if (ourport->src_clk_rate && rate != ourport->src_clk_rate) { ret = clk_set_rate(ourport->clk, ourport->src_clk_rate); if (ret < 0) dev_err(&ourport->pdev->dev, "UART clk set failed\n"); rate = clk_get_rate(ourport->clk); } *baud = rate / (16 * (ubrdiv + 1)); dbg("calculated baud %d\n", *baud); } } static int __init s3c24xx_serial_console_setup(struct console *co, char *options) { struct uart_port *port; int baud = 9600; int bits = 8; 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 >= CONFIG_SERIAL_SAMSUNG_UARTS) co->index = 0; port = &s3c24xx_serial_ports[co->index].port; /* is the port configured? */ if (port->mapbase == 0x0) return -ENODEV; cons_uart = port; dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index); /* * Check whether an invalid uart number has been specified, and * if so, search for the first available port that does have * console support. */ if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); else 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 console s3c24xx_serial_console = { .name = S3C24XX_SERIAL_NAME, .device = uart_console_device, .flags = CON_PRINTBUFFER, .index = -1, .write = s3c24xx_serial_console_write, .setup = s3c24xx_serial_console_setup, .data = &s3c24xx_uart_drv, }; #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */ #ifdef CONFIG_CPU_S3C2410 static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = { .info = &(struct s3c24xx_uart_info) { .name = "Samsung S3C2410 UART", .type = PORT_S3C2410, .fifosize = 16, .rx_fifomask = S3C2410_UFSTAT_RXMASK, .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT, .rx_fifofull = S3C2410_UFSTAT_RXFULL, .tx_fifofull = S3C2410_UFSTAT_TXFULL, .tx_fifomask = S3C2410_UFSTAT_TXMASK, .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT, .def_clk_sel = S3C2410_UCON_CLKSEL0, .num_clks = 2, .clksel_mask = S3C2410_UCON_CLKMASK, .clksel_shift = S3C2410_UCON_CLKSHIFT, }, .def_cfg = &(struct s3c2410_uartcfg) { .ucon = S3C2410_UCON_DEFAULT, .ufcon = S3C2410_UFCON_DEFAULT, }, }; #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data) #else #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL #endif #ifdef CONFIG_CPU_S3C2412 static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = { .info = &(struct s3c24xx_uart_info) { .name = "Samsung S3C2412 UART", .type = PORT_S3C2412, .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, .def_clk_sel = S3C2410_UCON_CLKSEL2, .num_clks = 4, .clksel_mask = S3C2412_UCON_CLKMASK, .clksel_shift = S3C2412_UCON_CLKSHIFT, }, .def_cfg = &(struct s3c2410_uartcfg) { .ucon = S3C2410_UCON_DEFAULT, .ufcon = S3C2410_UFCON_DEFAULT, }, }; #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data) #else #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL #endif #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \ defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442) static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = { .info = &(struct s3c24xx_uart_info) { .name = "Samsung S3C2440 UART", .type = PORT_S3C2440, .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, .def_clk_sel = S3C2410_UCON_CLKSEL2, .num_clks = 4, .clksel_mask = S3C2412_UCON_CLKMASK, .clksel_shift = S3C2412_UCON_CLKSHIFT, }, .def_cfg = &(struct s3c2410_uartcfg) { .ucon = S3C2410_UCON_DEFAULT, .ufcon = S3C2410_UFCON_DEFAULT, }, }; #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data) #else #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL #endif #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410) static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = { .info = &(struct s3c24xx_uart_info) { .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, .def_clk_sel = S3C2410_UCON_CLKSEL2, .num_clks = 4, .clksel_mask = S3C6400_UCON_CLKMASK, .clksel_shift = S3C6400_UCON_CLKSHIFT, }, .def_cfg = &(struct s3c2410_uartcfg) { .ucon = S3C2410_UCON_DEFAULT, .ufcon = S3C2410_UFCON_DEFAULT, }, }; #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data) #else #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL #endif #ifdef CONFIG_CPU_S5PV210 static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = { .info = &(struct s3c24xx_uart_info) { .name = "Samsung S5PV210 UART", .type = PORT_S3C6400, .has_divslot = 1, .rx_fifomask = S5PV210_UFSTAT_RXMASK, .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, .rx_fifofull = S5PV210_UFSTAT_RXFULL, .tx_fifofull = S5PV210_UFSTAT_TXFULL, .tx_fifomask = S5PV210_UFSTAT_TXMASK, .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, .def_clk_sel = S3C2410_UCON_CLKSEL0, .num_clks = 2, .clksel_mask = S5PV210_UCON_CLKMASK, .clksel_shift = S5PV210_UCON_CLKSHIFT, }, .def_cfg = &(struct s3c2410_uartcfg) { .ucon = S5PV210_UCON_DEFAULT, .ufcon = S5PV210_UFCON_DEFAULT, }, .fifosize = { 256, 64, 16, 16 }, }; #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data) #else #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL #endif #if defined(CONFIG_ARCH_EXYNOS) #define EXYNOS_COMMON_SERIAL_DRV_DATA \ .info = &(struct s3c24xx_uart_info) { \ .name = "Samsung Exynos UART", \ .type = PORT_S3C6400, \ .has_divslot = 1, \ .rx_fifomask = S5PV210_UFSTAT_RXMASK, \ .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \ .rx_fifofull = S5PV210_UFSTAT_RXFULL, \ .tx_fifofull = S5PV210_UFSTAT_TXFULL, \ .tx_fifomask = S5PV210_UFSTAT_TXMASK, \ .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \ .def_clk_sel = S3C2410_UCON_CLKSEL0, \ .num_clks = 1, \ .clksel_mask = 0, \ .clksel_shift = 0, \ }, \ .def_cfg = &(struct s3c2410_uartcfg) { \ .ucon = S5PV210_UCON_DEFAULT, \ .ufcon = S5PV210_UFCON_DEFAULT, \ .has_fracval = 1, \ } \ static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = { EXYNOS_COMMON_SERIAL_DRV_DATA, .fifosize = { 256, 64, 16, 16 }, }; static struct s3c24xx_serial_drv_data exynos_serial_drv_data = { EXYNOS_COMMON_SERIAL_DRV_DATA, .fifosize = { 0, }, }; #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data) #define EXYNOS_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos_serial_drv_data) #else #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL #define EXYNOS_SERIAL_DRV_DATA (kernel_ulong_t)NULL #endif static const struct platform_device_id s3c24xx_serial_driver_ids[] = { { .name = "s3c2410-uart", .driver_data = S3C2410_SERIAL_DRV_DATA, }, { .name = "s3c2412-uart", .driver_data = S3C2412_SERIAL_DRV_DATA, }, { .name = "s3c2440-uart", .driver_data = S3C2440_SERIAL_DRV_DATA, }, { .name = "s3c6400-uart", .driver_data = S3C6400_SERIAL_DRV_DATA, }, { .name = "s5pv210-uart", .driver_data = S5PV210_SERIAL_DRV_DATA, }, { .name = "exynos4210-uart", .driver_data = EXYNOS4210_SERIAL_DRV_DATA, }, { .name = "exynos-uart", .driver_data = EXYNOS_SERIAL_DRV_DATA, }, { }, }; MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids); #ifdef CONFIG_OF static const struct of_device_id s3c24xx_uart_dt_match[] = { { .compatible = "samsung,s3c2410-uart", .data = (void *)S3C2410_SERIAL_DRV_DATA }, { .compatible = "samsung,s3c2412-uart", .data = (void *)S3C2412_SERIAL_DRV_DATA }, { .compatible = "samsung,s3c2440-uart", .data = (void *)S3C2440_SERIAL_DRV_DATA }, { .compatible = "samsung,s3c6400-uart", .data = (void *)S3C6400_SERIAL_DRV_DATA }, { .compatible = "samsung,s5pv210-uart", .data = (void *)S5PV210_SERIAL_DRV_DATA }, { .compatible = "samsung,exynos4210-uart", .data = (void *)EXYNOS4210_SERIAL_DRV_DATA }, { .compatible = "samsung,exynos-uart", .data = (void *)EXYNOS_SERIAL_DRV_DATA }, {}, }; MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match); #endif static struct platform_driver samsung_serial_driver = { .probe = s3c24xx_serial_probe, .remove = s3c24xx_serial_remove, .id_table = s3c24xx_serial_driver_ids, .driver = { .name = "samsung-uart", .pm = SERIAL_SAMSUNG_PM_OPS, .of_match_table = of_match_ptr(s3c24xx_uart_dt_match), }, }; /* module initialisation code */ static int __init s3c24xx_serial_modinit(void) { int ret; ret = uart_register_driver(&s3c24xx_uart_drv); if (ret < 0) { pr_err("Failed to register Samsung UART driver\n"); return ret; } #ifdef CONFIG_CPU_IDLE exynos_pm_register_notifier(&s3c24xx_serial_notifier_block); #endif return platform_driver_register(&samsung_serial_driver); } static void __exit s3c24xx_serial_modexit(void) { platform_driver_unregister(&samsung_serial_driver); uart_unregister_driver(&s3c24xx_uart_drv); } module_init(s3c24xx_serial_modinit); module_exit(s3c24xx_serial_modexit); #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE /* * Early console. */ struct samsung_early_console_data { u32 txfull_mask; }; static void samsung_early_busyuart(struct uart_port *port) { while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE)) ; } static void samsung_early_busyuart_fifo(struct uart_port *port) { struct samsung_early_console_data *data = port->private_data; while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask) ; } static void samsung_early_putc(struct uart_port *port, int c) { if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE) samsung_early_busyuart_fifo(port); else samsung_early_busyuart(port); writeb(c, port->membase + S3C2410_UTXH); } static void samsung_early_write(struct console *con, const char *s, unsigned n) { struct earlycon_device *dev = con->data; uart_console_write(&dev->port, s, n, samsung_early_putc); } static int __init samsung_early_console_setup(struct earlycon_device *device, const char *opt) { if (!device->port.membase) return -ENODEV; device->con->write = samsung_early_write; return 0; } /* S3C2410 */ static struct samsung_early_console_data s3c2410_early_console_data = { .txfull_mask = S3C2410_UFSTAT_TXFULL, }; static int __init s3c2410_early_console_setup(struct earlycon_device *device, const char *opt) { device->port.private_data = &s3c2410_early_console_data; return samsung_early_console_setup(device, opt); } OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart", s3c2410_early_console_setup); /* S3C2412, S3C2440, S3C64xx */ static struct samsung_early_console_data s3c2440_early_console_data = { .txfull_mask = S3C2440_UFSTAT_TXFULL, }; static int __init s3c2440_early_console_setup(struct earlycon_device *device, const char *opt) { device->port.private_data = &s3c2440_early_console_data; return samsung_early_console_setup(device, opt); } OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart", s3c2440_early_console_setup); OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart", s3c2440_early_console_setup); OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart", s3c2440_early_console_setup); /* S5PV210, EXYNOS */ static struct samsung_early_console_data s5pv210_early_console_data = { .txfull_mask = S5PV210_UFSTAT_TXFULL, }; static int __init s5pv210_early_console_setup(struct earlycon_device *device, const char *opt) { device->port.private_data = &s5pv210_early_console_data; return samsung_early_console_setup(device, opt); } OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart", s5pv210_early_console_setup); OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart", s5pv210_early_console_setup); #endif MODULE_ALIAS("platform:samsung-uart"); MODULE_DESCRIPTION("Samsung SoC Serial port driver"); MODULE_AUTHOR("Ben Dooks "); MODULE_LICENSE("GPL v2");