| /* |
| * drivers/serial/sh-sci.c |
| * |
| * SuperH on-chip serial module support. (SCI with no FIFO / with FIFO) |
| * |
| * Copyright (C) 2002 - 2008 Paul Mundt |
| * Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007). |
| * |
| * based off of the old drivers/char/sh-sci.c by: |
| * |
| * Copyright (C) 1999, 2000 Niibe Yutaka |
| * Copyright (C) 2000 Sugioka Toshinobu |
| * Modified to support multiple serial ports. Stuart Menefy (May 2000). |
| * Modified to support SecureEdge. David McCullough (2002) |
| * Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003). |
| * Removed SH7300 support (Jul 2007). |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| */ |
| #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| #define SUPPORT_SYSRQ |
| #endif |
| |
| #undef DEBUG |
| |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/timer.h> |
| #include <linux/interrupt.h> |
| #include <linux/tty.h> |
| #include <linux/tty_flip.h> |
| #include <linux/serial.h> |
| #include <linux/major.h> |
| #include <linux/string.h> |
| #include <linux/sysrq.h> |
| #include <linux/ioport.h> |
| #include <linux/mm.h> |
| #include <linux/init.h> |
| #include <linux/delay.h> |
| #include <linux/console.h> |
| #include <linux/platform_device.h> |
| #include <linux/serial_sci.h> |
| #include <linux/notifier.h> |
| #include <linux/cpufreq.h> |
| #include <linux/clk.h> |
| #include <linux/ctype.h> |
| #include <linux/err.h> |
| #include <linux/list.h> |
| |
| #ifdef CONFIG_SUPERH |
| #include <asm/clock.h> |
| #include <asm/sh_bios.h> |
| #endif |
| |
| #ifdef CONFIG_H8300 |
| #include <asm/gpio.h> |
| #endif |
| |
| #include "sh-sci.h" |
| |
| struct sci_port { |
| struct uart_port port; |
| |
| /* Port type */ |
| unsigned int type; |
| |
| /* Port IRQs: ERI, RXI, TXI, BRI (optional) */ |
| unsigned int irqs[SCIx_NR_IRQS]; |
| |
| /* Port enable callback */ |
| void (*enable)(struct uart_port *port); |
| |
| /* Port disable callback */ |
| void (*disable)(struct uart_port *port); |
| |
| /* Break timer */ |
| struct timer_list break_timer; |
| int break_flag; |
| |
| #ifdef CONFIG_HAVE_CLK |
| /* Interface clock */ |
| struct clk *iclk; |
| /* Data clock */ |
| struct clk *dclk; |
| #endif |
| struct list_head node; |
| }; |
| |
| struct sh_sci_priv { |
| spinlock_t lock; |
| struct list_head ports; |
| |
| #ifdef CONFIG_HAVE_CLK |
| struct notifier_block clk_nb; |
| #endif |
| }; |
| |
| /* Function prototypes */ |
| static void sci_stop_tx(struct uart_port *port); |
| |
| #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS |
| |
| static struct sci_port sci_ports[SCI_NPORTS]; |
| static struct uart_driver sci_uart_driver; |
| |
| static inline struct sci_port * |
| to_sci_port(struct uart_port *uart) |
| { |
| return container_of(uart, struct sci_port, port); |
| } |
| |
| #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE) |
| |
| #ifdef CONFIG_CONSOLE_POLL |
| static inline void handle_error(struct uart_port *port) |
| { |
| /* Clear error flags */ |
| sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); |
| } |
| |
| static int sci_poll_get_char(struct uart_port *port) |
| { |
| unsigned short status; |
| int c; |
| |
| do { |
| status = sci_in(port, SCxSR); |
| if (status & SCxSR_ERRORS(port)) { |
| handle_error(port); |
| continue; |
| } |
| } while (!(status & SCxSR_RDxF(port))); |
| |
| c = sci_in(port, SCxRDR); |
| |
| /* Dummy read */ |
| sci_in(port, SCxSR); |
| sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); |
| |
| return c; |
| } |
| #endif |
| |
| static void sci_poll_put_char(struct uart_port *port, unsigned char c) |
| { |
| unsigned short status; |
| |
| do { |
| status = sci_in(port, SCxSR); |
| } while (!(status & SCxSR_TDxE(port))); |
| |
| sci_out(port, SCxTDR, c); |
| sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port)); |
| } |
| #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */ |
| |
| #if defined(__H8300S__) |
| enum { sci_disable, sci_enable }; |
| |
| static void h8300_sci_config(struct uart_port *port, unsigned int ctrl) |
| { |
| volatile unsigned char *mstpcrl = (volatile unsigned char *)MSTPCRL; |
| int ch = (port->mapbase - SMR0) >> 3; |
| unsigned char mask = 1 << (ch+1); |
| |
| if (ctrl == sci_disable) |
| *mstpcrl |= mask; |
| else |
| *mstpcrl &= ~mask; |
| } |
| |
| static void h8300_sci_enable(struct uart_port *port) |
| { |
| h8300_sci_config(port, sci_enable); |
| } |
| |
| static void h8300_sci_disable(struct uart_port *port) |
| { |
| h8300_sci_config(port, sci_disable); |
| } |
| #endif |
| |
| #if defined(__H8300H__) || defined(__H8300S__) |
| static void sci_init_pins(struct uart_port *port, unsigned int cflag) |
| { |
| int ch = (port->mapbase - SMR0) >> 3; |
| |
| /* set DDR regs */ |
| H8300_GPIO_DDR(h8300_sci_pins[ch].port, |
| h8300_sci_pins[ch].rx, |
| H8300_GPIO_INPUT); |
| H8300_GPIO_DDR(h8300_sci_pins[ch].port, |
| h8300_sci_pins[ch].tx, |
| H8300_GPIO_OUTPUT); |
| |
| /* tx mark output*/ |
| H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx; |
| } |
| #elif defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712) |
| static inline void sci_init_pins(struct uart_port *port, unsigned int cflag) |
| { |
| if (port->mapbase == 0xA4400000) { |
| __raw_writew(__raw_readw(PACR) & 0xffc0, PACR); |
| __raw_writew(__raw_readw(PBCR) & 0x0fff, PBCR); |
| } else if (port->mapbase == 0xA4410000) |
| __raw_writew(__raw_readw(PBCR) & 0xf003, PBCR); |
| } |
| #elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721) |
| static inline void sci_init_pins(struct uart_port *port, unsigned int cflag) |
| { |
| unsigned short data; |
| |
| if (cflag & CRTSCTS) { |
| /* enable RTS/CTS */ |
| if (port->mapbase == 0xa4430000) { /* SCIF0 */ |
| /* Clear PTCR bit 9-2; enable all scif pins but sck */ |
| data = __raw_readw(PORT_PTCR); |
| __raw_writew((data & 0xfc03), PORT_PTCR); |
| } else if (port->mapbase == 0xa4438000) { /* SCIF1 */ |
| /* Clear PVCR bit 9-2 */ |
| data = __raw_readw(PORT_PVCR); |
| __raw_writew((data & 0xfc03), PORT_PVCR); |
| } |
| } else { |
| if (port->mapbase == 0xa4430000) { /* SCIF0 */ |
| /* Clear PTCR bit 5-2; enable only tx and rx */ |
| data = __raw_readw(PORT_PTCR); |
| __raw_writew((data & 0xffc3), PORT_PTCR); |
| } else if (port->mapbase == 0xa4438000) { /* SCIF1 */ |
| /* Clear PVCR bit 5-2 */ |
| data = __raw_readw(PORT_PVCR); |
| __raw_writew((data & 0xffc3), PORT_PVCR); |
| } |
| } |
| } |
| #elif defined(CONFIG_CPU_SH3) |
| /* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */ |
| static inline void sci_init_pins(struct uart_port *port, unsigned int cflag) |
| { |
| unsigned short data; |
| |
| /* We need to set SCPCR to enable RTS/CTS */ |
| data = __raw_readw(SCPCR); |
| /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/ |
| __raw_writew(data & 0x0fcf, SCPCR); |
| |
| if (!(cflag & CRTSCTS)) { |
| /* We need to set SCPCR to enable RTS/CTS */ |
| data = __raw_readw(SCPCR); |
| /* Clear out SCP7MD1,0, SCP4MD1,0, |
| Set SCP6MD1,0 = {01} (output) */ |
| __raw_writew((data & 0x0fcf) | 0x1000, SCPCR); |
| |
| data = ctrl_inb(SCPDR); |
| /* Set /RTS2 (bit6) = 0 */ |
| ctrl_outb(data & 0xbf, SCPDR); |
| } |
| } |
| #elif defined(CONFIG_CPU_SUBTYPE_SH7722) |
| static inline void sci_init_pins(struct uart_port *port, unsigned int cflag) |
| { |
| unsigned short data; |
| |
| if (port->mapbase == 0xffe00000) { |
| data = __raw_readw(PSCR); |
| data &= ~0x03cf; |
| if (!(cflag & CRTSCTS)) |
| data |= 0x0340; |
| |
| __raw_writew(data, PSCR); |
| } |
| } |
| #elif defined(CONFIG_CPU_SUBTYPE_SH7757) || \ |
| defined(CONFIG_CPU_SUBTYPE_SH7763) || \ |
| defined(CONFIG_CPU_SUBTYPE_SH7780) || \ |
| defined(CONFIG_CPU_SUBTYPE_SH7785) || \ |
| defined(CONFIG_CPU_SUBTYPE_SH7786) || \ |
| defined(CONFIG_CPU_SUBTYPE_SHX3) |
| static inline void sci_init_pins(struct uart_port *port, unsigned int cflag) |
| { |
| if (!(cflag & CRTSCTS)) |
| __raw_writew(0x0080, SCSPTR0); /* Set RTS = 1 */ |
| } |
| #elif defined(CONFIG_CPU_SH4) && !defined(CONFIG_CPU_SH4A) |
| static inline void sci_init_pins(struct uart_port *port, unsigned int cflag) |
| { |
| if (!(cflag & CRTSCTS)) |
| __raw_writew(0x0080, SCSPTR2); /* Set RTS = 1 */ |
| } |
| #else |
| static inline void sci_init_pins(struct uart_port *port, unsigned int cflag) |
| { |
| /* Nothing to do */ |
| } |
| #endif |
| |
| #if defined(CONFIG_CPU_SUBTYPE_SH7760) || \ |
| defined(CONFIG_CPU_SUBTYPE_SH7780) || \ |
| defined(CONFIG_CPU_SUBTYPE_SH7785) || \ |
| defined(CONFIG_CPU_SUBTYPE_SH7786) |
| static inline int scif_txroom(struct uart_port *port) |
| { |
| return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff); |
| } |
| |
| static inline int scif_rxroom(struct uart_port *port) |
| { |
| return sci_in(port, SCRFDR) & 0xff; |
| } |
| #elif defined(CONFIG_CPU_SUBTYPE_SH7763) |
| static inline int scif_txroom(struct uart_port *port) |
| { |
| if ((port->mapbase == 0xffe00000) || |
| (port->mapbase == 0xffe08000)) { |
| /* SCIF0/1*/ |
| return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff); |
| } else { |
| /* SCIF2 */ |
| return SCIF2_TXROOM_MAX - (sci_in(port, SCFDR) >> 8); |
| } |
| } |
| |
| static inline int scif_rxroom(struct uart_port *port) |
| { |
| if ((port->mapbase == 0xffe00000) || |
| (port->mapbase == 0xffe08000)) { |
| /* SCIF0/1*/ |
| return sci_in(port, SCRFDR) & 0xff; |
| } else { |
| /* SCIF2 */ |
| return sci_in(port, SCFDR) & SCIF2_RFDC_MASK; |
| } |
| } |
| #else |
| static inline int scif_txroom(struct uart_port *port) |
| { |
| return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8); |
| } |
| |
| static inline int scif_rxroom(struct uart_port *port) |
| { |
| return sci_in(port, SCFDR) & SCIF_RFDC_MASK; |
| } |
| #endif |
| |
| static inline int sci_txroom(struct uart_port *port) |
| { |
| return (sci_in(port, SCxSR) & SCI_TDRE) != 0; |
| } |
| |
| static inline int sci_rxroom(struct uart_port *port) |
| { |
| return (sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0; |
| } |
| |
| /* ********************************************************************** * |
| * the interrupt related routines * |
| * ********************************************************************** */ |
| |
| static void sci_transmit_chars(struct uart_port *port) |
| { |
| struct circ_buf *xmit = &port->info->xmit; |
| unsigned int stopped = uart_tx_stopped(port); |
| unsigned short status; |
| unsigned short ctrl; |
| int count; |
| |
| status = sci_in(port, SCxSR); |
| if (!(status & SCxSR_TDxE(port))) { |
| ctrl = sci_in(port, SCSCR); |
| if (uart_circ_empty(xmit)) |
| ctrl &= ~SCI_CTRL_FLAGS_TIE; |
| else |
| ctrl |= SCI_CTRL_FLAGS_TIE; |
| sci_out(port, SCSCR, ctrl); |
| return; |
| } |
| |
| if (port->type == PORT_SCI) |
| count = sci_txroom(port); |
| else |
| count = scif_txroom(port); |
| |
| do { |
| unsigned char c; |
| |
| if (port->x_char) { |
| c = port->x_char; |
| port->x_char = 0; |
| } else if (!uart_circ_empty(xmit) && !stopped) { |
| c = xmit->buf[xmit->tail]; |
| xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| } else { |
| break; |
| } |
| |
| sci_out(port, SCxTDR, c); |
| |
| port->icount.tx++; |
| } while (--count > 0); |
| |
| sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); |
| |
| if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| uart_write_wakeup(port); |
| if (uart_circ_empty(xmit)) { |
| sci_stop_tx(port); |
| } else { |
| ctrl = sci_in(port, SCSCR); |
| |
| if (port->type != PORT_SCI) { |
| sci_in(port, SCxSR); /* Dummy read */ |
| sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); |
| } |
| |
| ctrl |= SCI_CTRL_FLAGS_TIE; |
| sci_out(port, SCSCR, ctrl); |
| } |
| } |
| |
| /* On SH3, SCIF may read end-of-break as a space->mark char */ |
| #define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); }) |
| |
| static inline void sci_receive_chars(struct uart_port *port) |
| { |
| struct sci_port *sci_port = to_sci_port(port); |
| struct tty_struct *tty = port->info->port.tty; |
| int i, count, copied = 0; |
| unsigned short status; |
| unsigned char flag; |
| |
| status = sci_in(port, SCxSR); |
| if (!(status & SCxSR_RDxF(port))) |
| return; |
| |
| while (1) { |
| if (port->type == PORT_SCI) |
| count = sci_rxroom(port); |
| else |
| count = scif_rxroom(port); |
| |
| /* Don't copy more bytes than there is room for in the buffer */ |
| count = tty_buffer_request_room(tty, count); |
| |
| /* If for any reason we can't copy more data, we're done! */ |
| if (count == 0) |
| break; |
| |
| if (port->type == PORT_SCI) { |
| char c = sci_in(port, SCxRDR); |
| if (uart_handle_sysrq_char(port, c) || |
| sci_port->break_flag) |
| count = 0; |
| else |
| tty_insert_flip_char(tty, c, TTY_NORMAL); |
| } else { |
| for (i = 0; i < count; i++) { |
| char c = sci_in(port, SCxRDR); |
| status = sci_in(port, SCxSR); |
| #if defined(CONFIG_CPU_SH3) |
| /* Skip "chars" during break */ |
| if (sci_port->break_flag) { |
| if ((c == 0) && |
| (status & SCxSR_FER(port))) { |
| count--; i--; |
| continue; |
| } |
| |
| /* Nonzero => end-of-break */ |
| dev_dbg(port->dev, "debounce<%02x>\n", c); |
| sci_port->break_flag = 0; |
| |
| if (STEPFN(c)) { |
| count--; i--; |
| continue; |
| } |
| } |
| #endif /* CONFIG_CPU_SH3 */ |
| if (uart_handle_sysrq_char(port, c)) { |
| count--; i--; |
| continue; |
| } |
| |
| /* Store data and status */ |
| if (status&SCxSR_FER(port)) { |
| flag = TTY_FRAME; |
| dev_notice(port->dev, "frame error\n"); |
| } else if (status&SCxSR_PER(port)) { |
| flag = TTY_PARITY; |
| dev_notice(port->dev, "parity error\n"); |
| } else |
| flag = TTY_NORMAL; |
| |
| tty_insert_flip_char(tty, c, flag); |
| } |
| } |
| |
| sci_in(port, SCxSR); /* dummy read */ |
| sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); |
| |
| copied += count; |
| port->icount.rx += count; |
| } |
| |
| if (copied) { |
| /* Tell the rest of the system the news. New characters! */ |
| tty_flip_buffer_push(tty); |
| } else { |
| sci_in(port, SCxSR); /* dummy read */ |
| sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); |
| } |
| } |
| |
| #define SCI_BREAK_JIFFIES (HZ/20) |
| /* The sci generates interrupts during the break, |
| * 1 per millisecond or so during the break period, for 9600 baud. |
| * So dont bother disabling interrupts. |
| * But dont want more than 1 break event. |
| * Use a kernel timer to periodically poll the rx line until |
| * the break is finished. |
| */ |
| static void sci_schedule_break_timer(struct sci_port *port) |
| { |
| port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES; |
| add_timer(&port->break_timer); |
| } |
| /* Ensure that two consecutive samples find the break over. */ |
| static void sci_break_timer(unsigned long data) |
| { |
| struct sci_port *port = (struct sci_port *)data; |
| |
| if (sci_rxd_in(&port->port) == 0) { |
| port->break_flag = 1; |
| sci_schedule_break_timer(port); |
| } else if (port->break_flag == 1) { |
| /* break is over. */ |
| port->break_flag = 2; |
| sci_schedule_break_timer(port); |
| } else |
| port->break_flag = 0; |
| } |
| |
| static inline int sci_handle_errors(struct uart_port *port) |
| { |
| int copied = 0; |
| unsigned short status = sci_in(port, SCxSR); |
| struct tty_struct *tty = port->info->port.tty; |
| |
| if (status & SCxSR_ORER(port)) { |
| /* overrun error */ |
| if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) |
| copied++; |
| |
| dev_notice(port->dev, "overrun error"); |
| } |
| |
| if (status & SCxSR_FER(port)) { |
| if (sci_rxd_in(port) == 0) { |
| /* Notify of BREAK */ |
| struct sci_port *sci_port = to_sci_port(port); |
| |
| if (!sci_port->break_flag) { |
| sci_port->break_flag = 1; |
| sci_schedule_break_timer(sci_port); |
| |
| /* Do sysrq handling. */ |
| if (uart_handle_break(port)) |
| return 0; |
| |
| dev_dbg(port->dev, "BREAK detected\n"); |
| |
| if (tty_insert_flip_char(tty, 0, TTY_BREAK)) |
| copied++; |
| } |
| |
| } else { |
| /* frame error */ |
| if (tty_insert_flip_char(tty, 0, TTY_FRAME)) |
| copied++; |
| |
| dev_notice(port->dev, "frame error\n"); |
| } |
| } |
| |
| if (status & SCxSR_PER(port)) { |
| /* parity error */ |
| if (tty_insert_flip_char(tty, 0, TTY_PARITY)) |
| copied++; |
| |
| dev_notice(port->dev, "parity error"); |
| } |
| |
| if (copied) |
| tty_flip_buffer_push(tty); |
| |
| return copied; |
| } |
| |
| static inline int sci_handle_fifo_overrun(struct uart_port *port) |
| { |
| struct tty_struct *tty = port->info->port.tty; |
| int copied = 0; |
| |
| if (port->type != PORT_SCIF) |
| return 0; |
| |
| if ((sci_in(port, SCLSR) & SCIF_ORER) != 0) { |
| sci_out(port, SCLSR, 0); |
| |
| tty_insert_flip_char(tty, 0, TTY_OVERRUN); |
| tty_flip_buffer_push(tty); |
| |
| dev_notice(port->dev, "overrun error\n"); |
| copied++; |
| } |
| |
| return copied; |
| } |
| |
| static inline int sci_handle_breaks(struct uart_port *port) |
| { |
| int copied = 0; |
| unsigned short status = sci_in(port, SCxSR); |
| struct tty_struct *tty = port->info->port.tty; |
| struct sci_port *s = to_sci_port(port); |
| |
| if (uart_handle_break(port)) |
| return 0; |
| |
| if (!s->break_flag && status & SCxSR_BRK(port)) { |
| #if defined(CONFIG_CPU_SH3) |
| /* Debounce break */ |
| s->break_flag = 1; |
| #endif |
| /* Notify of BREAK */ |
| if (tty_insert_flip_char(tty, 0, TTY_BREAK)) |
| copied++; |
| |
| dev_dbg(port->dev, "BREAK detected\n"); |
| } |
| |
| if (copied) |
| tty_flip_buffer_push(tty); |
| |
| copied += sci_handle_fifo_overrun(port); |
| |
| return copied; |
| } |
| |
| static irqreturn_t sci_rx_interrupt(int irq, void *port) |
| { |
| /* I think sci_receive_chars has to be called irrespective |
| * of whether the I_IXOFF is set, otherwise, how is the interrupt |
| * to be disabled? |
| */ |
| sci_receive_chars(port); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t sci_tx_interrupt(int irq, void *ptr) |
| { |
| struct uart_port *port = ptr; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&port->lock, flags); |
| sci_transmit_chars(port); |
| spin_unlock_irqrestore(&port->lock, flags); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t sci_er_interrupt(int irq, void *ptr) |
| { |
| struct uart_port *port = ptr; |
| |
| /* Handle errors */ |
| if (port->type == PORT_SCI) { |
| if (sci_handle_errors(port)) { |
| /* discard character in rx buffer */ |
| sci_in(port, SCxSR); |
| sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); |
| } |
| } else { |
| sci_handle_fifo_overrun(port); |
| sci_rx_interrupt(irq, ptr); |
| } |
| |
| sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); |
| |
| /* Kick the transmission */ |
| sci_tx_interrupt(irq, ptr); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t sci_br_interrupt(int irq, void *ptr) |
| { |
| struct uart_port *port = ptr; |
| |
| /* Handle BREAKs */ |
| sci_handle_breaks(port); |
| sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port)); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) |
| { |
| unsigned short ssr_status, scr_status, err_enabled; |
| struct uart_port *port = ptr; |
| irqreturn_t ret = IRQ_NONE; |
| |
| ssr_status = sci_in(port, SCxSR); |
| scr_status = sci_in(port, SCSCR); |
| err_enabled = scr_status & (SCI_CTRL_FLAGS_REIE | SCI_CTRL_FLAGS_RIE); |
| |
| /* Tx Interrupt */ |
| if ((ssr_status & SCxSR_TDxE(port)) && (scr_status & SCI_CTRL_FLAGS_TIE)) |
| ret = sci_tx_interrupt(irq, ptr); |
| /* Rx Interrupt */ |
| if ((ssr_status & SCxSR_RDxF(port)) && (scr_status & SCI_CTRL_FLAGS_RIE)) |
| ret = sci_rx_interrupt(irq, ptr); |
| /* Error Interrupt */ |
| if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled) |
| ret = sci_er_interrupt(irq, ptr); |
| /* Break Interrupt */ |
| if ((ssr_status & SCxSR_BRK(port)) && err_enabled) |
| ret = sci_br_interrupt(irq, ptr); |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_HAVE_CLK |
| /* |
| * Here we define a transistion notifier so that we can update all of our |
| * ports' baud rate when the peripheral clock changes. |
| */ |
| static int sci_notifier(struct notifier_block *self, |
| unsigned long phase, void *p) |
| { |
| struct sh_sci_priv *priv = container_of(self, |
| struct sh_sci_priv, clk_nb); |
| struct sci_port *sci_port; |
| unsigned long flags; |
| |
| if ((phase == CPUFREQ_POSTCHANGE) || |
| (phase == CPUFREQ_RESUMECHANGE)) { |
| spin_lock_irqsave(&priv->lock, flags); |
| list_for_each_entry(sci_port, &priv->ports, node) |
| sci_port->port.uartclk = clk_get_rate(sci_port->dclk); |
| |
| spin_unlock_irqrestore(&priv->lock, flags); |
| } |
| |
| return NOTIFY_OK; |
| } |
| |
| static void sci_clk_enable(struct uart_port *port) |
| { |
| struct sci_port *sci_port = to_sci_port(port); |
| |
| clk_enable(sci_port->dclk); |
| sci_port->port.uartclk = clk_get_rate(sci_port->dclk); |
| |
| if (sci_port->iclk) |
| clk_enable(sci_port->iclk); |
| } |
| |
| static void sci_clk_disable(struct uart_port *port) |
| { |
| struct sci_port *sci_port = to_sci_port(port); |
| |
| if (sci_port->iclk) |
| clk_disable(sci_port->iclk); |
| |
| clk_disable(sci_port->dclk); |
| } |
| #endif |
| |
| static int sci_request_irq(struct sci_port *port) |
| { |
| int i; |
| irqreturn_t (*handlers[4])(int irq, void *ptr) = { |
| sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt, |
| sci_br_interrupt, |
| }; |
| const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full", |
| "SCI Transmit Data Empty", "SCI Break" }; |
| |
| if (port->irqs[0] == port->irqs[1]) { |
| if (unlikely(!port->irqs[0])) |
| return -ENODEV; |
| |
| if (request_irq(port->irqs[0], sci_mpxed_interrupt, |
| IRQF_DISABLED, "sci", port)) { |
| dev_err(port->port.dev, "Can't allocate IRQ\n"); |
| return -ENODEV; |
| } |
| } else { |
| for (i = 0; i < ARRAY_SIZE(handlers); i++) { |
| if (unlikely(!port->irqs[i])) |
| continue; |
| |
| if (request_irq(port->irqs[i], handlers[i], |
| IRQF_DISABLED, desc[i], port)) { |
| dev_err(port->port.dev, "Can't allocate IRQ\n"); |
| return -ENODEV; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void sci_free_irq(struct sci_port *port) |
| { |
| int i; |
| |
| if (port->irqs[0] == port->irqs[1]) |
| free_irq(port->irqs[0], port); |
| else { |
| for (i = 0; i < ARRAY_SIZE(port->irqs); i++) { |
| if (!port->irqs[i]) |
| continue; |
| |
| free_irq(port->irqs[i], port); |
| } |
| } |
| } |
| |
| static unsigned int sci_tx_empty(struct uart_port *port) |
| { |
| /* Can't detect */ |
| return TIOCSER_TEMT; |
| } |
| |
| static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| { |
| /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */ |
| /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */ |
| /* If you have signals for DTR and DCD, please implement here. */ |
| } |
| |
| static unsigned int sci_get_mctrl(struct uart_port *port) |
| { |
| /* This routine is used for geting signals of: DTR, DCD, DSR, RI, |
| and CTS/RTS */ |
| |
| return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR; |
| } |
| |
| static void sci_start_tx(struct uart_port *port) |
| { |
| unsigned short ctrl; |
| |
| /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */ |
| ctrl = sci_in(port, SCSCR); |
| ctrl |= SCI_CTRL_FLAGS_TIE; |
| sci_out(port, SCSCR, ctrl); |
| } |
| |
| static void sci_stop_tx(struct uart_port *port) |
| { |
| unsigned short ctrl; |
| |
| /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */ |
| ctrl = sci_in(port, SCSCR); |
| ctrl &= ~SCI_CTRL_FLAGS_TIE; |
| sci_out(port, SCSCR, ctrl); |
| } |
| |
| static void sci_start_rx(struct uart_port *port, unsigned int tty_start) |
| { |
| unsigned short ctrl; |
| |
| /* Set RIE (Receive Interrupt Enable) bit in SCSCR */ |
| ctrl = sci_in(port, SCSCR); |
| ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE; |
| sci_out(port, SCSCR, ctrl); |
| } |
| |
| static void sci_stop_rx(struct uart_port *port) |
| { |
| unsigned short ctrl; |
| |
| /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */ |
| ctrl = sci_in(port, SCSCR); |
| ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE); |
| sci_out(port, SCSCR, ctrl); |
| } |
| |
| static void sci_enable_ms(struct uart_port *port) |
| { |
| /* Nothing here yet .. */ |
| } |
| |
| static void sci_break_ctl(struct uart_port *port, int break_state) |
| { |
| /* Nothing here yet .. */ |
| } |
| |
| static int sci_startup(struct uart_port *port) |
| { |
| struct sci_port *s = to_sci_port(port); |
| |
| if (s->enable) |
| s->enable(port); |
| |
| sci_request_irq(s); |
| sci_start_tx(port); |
| sci_start_rx(port, 1); |
| |
| return 0; |
| } |
| |
| static void sci_shutdown(struct uart_port *port) |
| { |
| struct sci_port *s = to_sci_port(port); |
| |
| sci_stop_rx(port); |
| sci_stop_tx(port); |
| sci_free_irq(s); |
| |
| if (s->disable) |
| s->disable(port); |
| } |
| |
| static void sci_set_termios(struct uart_port *port, struct ktermios *termios, |
| struct ktermios *old) |
| { |
| unsigned int status, baud, smr_val; |
| int t = -1; |
| |
| baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); |
| if (likely(baud)) |
| t = SCBRR_VALUE(baud, port->uartclk); |
| |
| do { |
| status = sci_in(port, SCxSR); |
| } while (!(status & SCxSR_TEND(port))); |
| |
| sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */ |
| |
| if (port->type != PORT_SCI) |
| sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST); |
| |
| smr_val = sci_in(port, SCSMR) & 3; |
| if ((termios->c_cflag & CSIZE) == CS7) |
| smr_val |= 0x40; |
| if (termios->c_cflag & PARENB) |
| smr_val |= 0x20; |
| if (termios->c_cflag & PARODD) |
| smr_val |= 0x30; |
| if (termios->c_cflag & CSTOPB) |
| smr_val |= 0x08; |
| |
| uart_update_timeout(port, termios->c_cflag, baud); |
| |
| sci_out(port, SCSMR, smr_val); |
| |
| if (t > 0) { |
| if (t >= 256) { |
| sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1); |
| t >>= 2; |
| } else |
| sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3); |
| |
| sci_out(port, SCBRR, t); |
| udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */ |
| } |
| |
| sci_init_pins(port, termios->c_cflag); |
| sci_out(port, SCFCR, (termios->c_cflag & CRTSCTS) ? SCFCR_MCE : 0); |
| |
| sci_out(port, SCSCR, SCSCR_INIT(port)); |
| |
| if ((termios->c_cflag & CREAD) != 0) |
| sci_start_rx(port, 0); |
| } |
| |
| static const char *sci_type(struct uart_port *port) |
| { |
| switch (port->type) { |
| case PORT_IRDA: |
| return "irda"; |
| case PORT_SCI: |
| return "sci"; |
| case PORT_SCIF: |
| return "scif"; |
| case PORT_SCIFA: |
| return "scifa"; |
| } |
| |
| return NULL; |
| } |
| |
| static void sci_release_port(struct uart_port *port) |
| { |
| /* Nothing here yet .. */ |
| } |
| |
| static int sci_request_port(struct uart_port *port) |
| { |
| /* Nothing here yet .. */ |
| return 0; |
| } |
| |
| static void sci_config_port(struct uart_port *port, int flags) |
| { |
| struct sci_port *s = to_sci_port(port); |
| |
| port->type = s->type; |
| |
| if (port->membase) |
| return; |
| |
| if (port->flags & UPF_IOREMAP) { |
| port->membase = ioremap_nocache(port->mapbase, 0x40); |
| |
| if (IS_ERR(port->membase)) |
| dev_err(port->dev, "can't remap port#%d\n", port->line); |
| } else { |
| /* |
| * For the simple (and majority of) cases where we don't |
| * need to do any remapping, just cast the cookie |
| * directly. |
| */ |
| port->membase = (void __iomem *)port->mapbase; |
| } |
| } |
| |
| static int sci_verify_port(struct uart_port *port, struct serial_struct *ser) |
| { |
| struct sci_port *s = to_sci_port(port); |
| |
| if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > nr_irqs) |
| return -EINVAL; |
| if (ser->baud_base < 2400) |
| /* No paper tape reader for Mitch.. */ |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static struct uart_ops sci_uart_ops = { |
| .tx_empty = sci_tx_empty, |
| .set_mctrl = sci_set_mctrl, |
| .get_mctrl = sci_get_mctrl, |
| .start_tx = sci_start_tx, |
| .stop_tx = sci_stop_tx, |
| .stop_rx = sci_stop_rx, |
| .enable_ms = sci_enable_ms, |
| .break_ctl = sci_break_ctl, |
| .startup = sci_startup, |
| .shutdown = sci_shutdown, |
| .set_termios = sci_set_termios, |
| .type = sci_type, |
| .release_port = sci_release_port, |
| .request_port = sci_request_port, |
| .config_port = sci_config_port, |
| .verify_port = sci_verify_port, |
| #ifdef CONFIG_CONSOLE_POLL |
| .poll_get_char = sci_poll_get_char, |
| .poll_put_char = sci_poll_put_char, |
| #endif |
| }; |
| |
| static void __devinit sci_init_single(struct platform_device *dev, |
| struct sci_port *sci_port, |
| unsigned int index, |
| struct plat_sci_port *p) |
| { |
| sci_port->port.ops = &sci_uart_ops; |
| sci_port->port.iotype = UPIO_MEM; |
| sci_port->port.line = index; |
| sci_port->port.fifosize = 1; |
| |
| #if defined(__H8300H__) || defined(__H8300S__) |
| #ifdef __H8300S__ |
| sci_port->enable = h8300_sci_enable; |
| sci_port->disable = h8300_sci_disable; |
| #endif |
| sci_port->port.uartclk = CONFIG_CPU_CLOCK; |
| #elif defined(CONFIG_HAVE_CLK) |
| sci_port->iclk = p->clk ? clk_get(&dev->dev, p->clk) : NULL; |
| sci_port->dclk = clk_get(&dev->dev, "peripheral_clk"); |
| sci_port->enable = sci_clk_enable; |
| sci_port->disable = sci_clk_disable; |
| #else |
| #error "Need a valid uartclk" |
| #endif |
| |
| sci_port->break_timer.data = (unsigned long)sci_port; |
| sci_port->break_timer.function = sci_break_timer; |
| init_timer(&sci_port->break_timer); |
| |
| sci_port->port.mapbase = p->mapbase; |
| sci_port->port.membase = p->membase; |
| |
| sci_port->port.irq = p->irqs[SCIx_TXI_IRQ]; |
| sci_port->port.flags = p->flags; |
| sci_port->port.dev = &dev->dev; |
| sci_port->type = sci_port->port.type = p->type; |
| |
| memcpy(&sci_port->irqs, &p->irqs, sizeof(p->irqs)); |
| |
| } |
| |
| #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE |
| static struct tty_driver *serial_console_device(struct console *co, int *index) |
| { |
| struct uart_driver *p = &sci_uart_driver; |
| *index = co->index; |
| return p->tty_driver; |
| } |
| |
| static void serial_console_putchar(struct uart_port *port, int ch) |
| { |
| sci_poll_put_char(port, ch); |
| } |
| |
| /* |
| * Print a string to the serial port trying not to disturb |
| * any possible real use of the port... |
| */ |
| static void serial_console_write(struct console *co, const char *s, |
| unsigned count) |
| { |
| struct uart_port *port = co->data; |
| struct sci_port *sci_port = to_sci_port(port); |
| unsigned short bits; |
| |
| if (sci_port->enable) |
| sci_port->enable(port); |
| |
| uart_console_write(port, s, count, serial_console_putchar); |
| |
| /* wait until fifo is empty and last bit has been transmitted */ |
| bits = SCxSR_TDxE(port) | SCxSR_TEND(port); |
| while ((sci_in(port, SCxSR) & bits) != bits) |
| cpu_relax(); |
| |
| if (sci_port->disable); |
| sci_port->disable(port); |
| } |
| |
| static int __init serial_console_setup(struct console *co, char *options) |
| { |
| struct sci_port *sci_port; |
| struct uart_port *port; |
| int baud = 115200; |
| int bits = 8; |
| int parity = 'n'; |
| int flow = 'n'; |
| int ret; |
| |
| /* |
| * Check whether an invalid uart number has been specified, and |
| * if so, search for the first available port that does have |
| * console support. |
| */ |
| if (co->index >= SCI_NPORTS) |
| co->index = 0; |
| |
| sci_port = &sci_ports[co->index]; |
| port = &sci_port->port; |
| co->data = port; |
| |
| /* |
| * Also need to check port->type, we don't actually have any |
| * UPIO_PORT ports, but uart_report_port() handily misreports |
| * it anyways if we don't have a port available by the time this is |
| * called. |
| */ |
| if (!port->type) |
| return -ENODEV; |
| |
| sci_config_port(port, 0); |
| |
| if (sci_port->enable) |
| sci_port->enable(port); |
| |
| if (options) |
| uart_parse_options(options, &baud, &parity, &bits, &flow); |
| |
| ret = uart_set_options(port, co, baud, parity, bits, flow); |
| #if defined(__H8300H__) || defined(__H8300S__) |
| /* disable rx interrupt */ |
| if (ret == 0) |
| sci_stop_rx(port); |
| #endif |
| /* TODO: disable clock */ |
| return ret; |
| } |
| |
| static struct console serial_console = { |
| .name = "ttySC", |
| .device = serial_console_device, |
| .write = serial_console_write, |
| .setup = serial_console_setup, |
| .flags = CON_PRINTBUFFER, |
| .index = -1, |
| }; |
| |
| static int __init sci_console_init(void) |
| { |
| register_console(&serial_console); |
| return 0; |
| } |
| console_initcall(sci_console_init); |
| #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */ |
| |
| #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) |
| #define SCI_CONSOLE (&serial_console) |
| #else |
| #define SCI_CONSOLE 0 |
| #endif |
| |
| static char banner[] __initdata = |
| KERN_INFO "SuperH SCI(F) driver initialized\n"; |
| |
| static struct uart_driver sci_uart_driver = { |
| .owner = THIS_MODULE, |
| .driver_name = "sci", |
| .dev_name = "ttySC", |
| .major = SCI_MAJOR, |
| .minor = SCI_MINOR_START, |
| .nr = SCI_NPORTS, |
| .cons = SCI_CONSOLE, |
| }; |
| |
| |
| static int sci_remove(struct platform_device *dev) |
| { |
| struct sh_sci_priv *priv = platform_get_drvdata(dev); |
| struct sci_port *p; |
| unsigned long flags; |
| |
| #ifdef CONFIG_HAVE_CLK |
| cpufreq_unregister_notifier(&priv->clk_nb, CPUFREQ_TRANSITION_NOTIFIER); |
| #endif |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| list_for_each_entry(p, &priv->ports, node) |
| uart_remove_one_port(&sci_uart_driver, &p->port); |
| |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| kfree(priv); |
| return 0; |
| } |
| |
| static int __devinit sci_probe_single(struct platform_device *dev, |
| unsigned int index, |
| struct plat_sci_port *p, |
| struct sci_port *sciport) |
| { |
| struct sh_sci_priv *priv = platform_get_drvdata(dev); |
| unsigned long flags; |
| int ret; |
| |
| /* Sanity check */ |
| if (unlikely(index >= SCI_NPORTS)) { |
| dev_notice(&dev->dev, "Attempting to register port " |
| "%d when only %d are available.\n", |
| index+1, SCI_NPORTS); |
| dev_notice(&dev->dev, "Consider bumping " |
| "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n"); |
| return 0; |
| } |
| |
| sci_init_single(dev, sciport, index, p); |
| |
| ret = uart_add_one_port(&sci_uart_driver, &sciport->port); |
| if (ret) |
| return ret; |
| |
| INIT_LIST_HEAD(&sciport->node); |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| list_add(&sciport->node, &priv->ports); |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| return 0; |
| } |
| |
| /* |
| * Register a set of serial devices attached to a platform device. The |
| * list is terminated with a zero flags entry, which means we expect |
| * all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need |
| * remapping (such as sh64) should also set UPF_IOREMAP. |
| */ |
| static int __devinit sci_probe(struct platform_device *dev) |
| { |
| struct plat_sci_port *p = dev->dev.platform_data; |
| struct sh_sci_priv *priv; |
| int i, ret = -EINVAL; |
| |
| priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| if (!priv) |
| return -ENOMEM; |
| |
| INIT_LIST_HEAD(&priv->ports); |
| spin_lock_init(&priv->lock); |
| platform_set_drvdata(dev, priv); |
| |
| #ifdef CONFIG_HAVE_CLK |
| priv->clk_nb.notifier_call = sci_notifier; |
| cpufreq_register_notifier(&priv->clk_nb, CPUFREQ_TRANSITION_NOTIFIER); |
| #endif |
| |
| if (dev->id != -1) { |
| ret = sci_probe_single(dev, dev->id, p, &sci_ports[dev->id]); |
| if (ret) |
| goto err_unreg; |
| } else { |
| for (i = 0; p && p->flags != 0; p++, i++) { |
| ret = sci_probe_single(dev, i, p, &sci_ports[i]); |
| if (ret) |
| goto err_unreg; |
| } |
| } |
| |
| #ifdef CONFIG_SH_STANDARD_BIOS |
| sh_bios_gdb_detach(); |
| #endif |
| |
| return 0; |
| |
| err_unreg: |
| sci_remove(dev); |
| return ret; |
| } |
| |
| static int sci_suspend(struct device *dev) |
| { |
| struct sh_sci_priv *priv = dev_get_drvdata(dev); |
| struct sci_port *p; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| list_for_each_entry(p, &priv->ports, node) |
| uart_suspend_port(&sci_uart_driver, &p->port); |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| return 0; |
| } |
| |
| static int sci_resume(struct device *dev) |
| { |
| struct sh_sci_priv *priv = dev_get_drvdata(dev); |
| struct sci_port *p; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| list_for_each_entry(p, &priv->ports, node) |
| uart_resume_port(&sci_uart_driver, &p->port); |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| return 0; |
| } |
| |
| static struct dev_pm_ops sci_dev_pm_ops = { |
| .suspend = sci_suspend, |
| .resume = sci_resume, |
| }; |
| |
| static struct platform_driver sci_driver = { |
| .probe = sci_probe, |
| .remove = __devexit_p(sci_remove), |
| .driver = { |
| .name = "sh-sci", |
| .owner = THIS_MODULE, |
| .pm = &sci_dev_pm_ops, |
| }, |
| }; |
| |
| static int __init sci_init(void) |
| { |
| int ret; |
| |
| printk(banner); |
| |
| ret = uart_register_driver(&sci_uart_driver); |
| if (likely(ret == 0)) { |
| ret = platform_driver_register(&sci_driver); |
| if (unlikely(ret)) |
| uart_unregister_driver(&sci_uart_driver); |
| } |
| |
| return ret; |
| } |
| |
| static void __exit sci_exit(void) |
| { |
| platform_driver_unregister(&sci_driver); |
| uart_unregister_driver(&sci_uart_driver); |
| } |
| |
| module_init(sci_init); |
| module_exit(sci_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:sh-sci"); |