diff options
Diffstat (limited to 'drivers/serial/sh-sci.c')
| -rw-r--r-- | drivers/serial/sh-sci.c | 1571 |
1 files changed, 0 insertions, 1571 deletions
diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c deleted file mode 100644 index 3df2aaec829..00000000000 --- a/drivers/serial/sh-sci.c +++ /dev/null @@ -1,1571 +0,0 @@ -/* - * drivers/serial/sh-sci.c - * - * SuperH on-chip serial module support. (SCI with no FIFO / with FIFO) - * - * Copyright (C) 2002 - 2006 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> - -#ifdef CONFIG_SUPERH -#include <asm/clock.h> -#include <asm/sh_bios.h> -#include <asm/kgdb.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 pin configuration */ - void (*init_pins)(struct uart_port *port, - unsigned int cflag); - - /* 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_SUPERH - /* Port clock */ - struct clk *clk; -#endif -}; - -#ifdef CONFIG_SH_KGDB -static struct sci_port *kgdb_sci_port; -#endif - -#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE -static struct sci_port *serial_console_port; -#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; - -#if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && \ - defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB) -static inline void handle_error(struct uart_port *port) -{ - /* Clear error flags */ - sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); -} - -static int get_char(struct uart_port *port) -{ - unsigned long flags; - unsigned short status; - int c; - - spin_lock_irqsave(&port->lock, flags); - 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); - sci_in(port, SCxSR); /* Dummy read */ - sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); - spin_unlock_irqrestore(&port->lock, flags); - - return c; -} -#endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */ - -#if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || defined(CONFIG_SH_KGDB) -static void put_char(struct uart_port *port, char c) -{ - unsigned long flags; - unsigned short status; - - spin_lock_irqsave(&port->lock, flags); - - do { - status = sci_in(port, SCxSR); - } while (!(status & SCxSR_TDxE(port))); - - sci_out(port, SCxTDR, c); - sci_in(port, SCxSR); /* Dummy read */ - sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); - - spin_unlock_irqrestore(&port->lock, flags); -} -#endif - -#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE -static void put_string(struct sci_port *sci_port, const char *buffer, int count) -{ - struct uart_port *port = &sci_port->port; - const unsigned char *p = buffer; - int i; - -#if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB) - int checksum; - int usegdb=0; - -#ifdef CONFIG_SH_STANDARD_BIOS - /* This call only does a trap the first time it is - * called, and so is safe to do here unconditionally - */ - usegdb |= sh_bios_in_gdb_mode(); -#endif -#ifdef CONFIG_SH_KGDB - usegdb |= (kgdb_in_gdb_mode && (sci_port == kgdb_sci_port)); -#endif - - if (usegdb) { - /* $<packet info>#<checksum>. */ - do { - unsigned char c; - put_char(port, '$'); - put_char(port, 'O'); /* 'O'utput to console */ - checksum = 'O'; - - for (i=0; i<count; i++) { /* Don't use run length encoding */ - int h, l; - - c = *p++; - h = hex_asc_hi(c); - l = hex_asc_lo(c); - put_char(port, h); - put_char(port, l); - checksum += h + l; - } - put_char(port, '#'); - put_char(port, hex_asc_hi(checksum)); - put_char(port, hex_asc_lo(checksum)); - } while (get_char(port) != '+'); - } else -#endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */ - for (i=0; i<count; i++) { - if (*p == 10) - put_char(port, '\r'); - put_char(port, *p++); - } -} -#endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */ - -#ifdef CONFIG_SH_KGDB -static int kgdb_sci_getchar(void) -{ - int c; - - /* Keep trying to read a character, this could be neater */ - while ((c = get_char(&kgdb_sci_port->port)) < 0) - cpu_relax(); - - return c; -} - -static inline void kgdb_sci_putchar(int c) -{ - put_char(&kgdb_sci_port->port, c); -} -#endif /* CONFIG_SH_KGDB */ - -#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 inline void h8300_sci_enable(struct uart_port *port) -{ - h8300_sci_config(port, sci_enable); -} - -static inline void h8300_sci_disable(struct uart_port *port) -{ - h8300_sci_config(port, sci_disable); -} -#endif - -#if defined(SCI_ONLY) || defined(SCI_AND_SCIF) && \ - defined(__H8300H__) || defined(__H8300S__) -static void sci_init_pins_sci(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; -} -#else -#define sci_init_pins_sci NULL -#endif - -#if defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709) -static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag) -{ - unsigned int fcr_val = 0; - - if (cflag & CRTSCTS) - fcr_val |= SCFCR_MCE; - - sci_out(port, SCFCR, fcr_val); -} -#else -#define sci_init_pins_irda NULL -#endif - -#ifdef SCI_ONLY -#define sci_init_pins_scif NULL -#endif - -#if defined(SCIF_ONLY) || defined(SCI_AND_SCIF) -#if defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712) -static void sci_init_pins_scif(struct uart_port* port, unsigned int cflag) -{ - unsigned int fcr_val = 0; - - set_sh771x_scif_pfc(port); - if (cflag & CRTSCTS) { - fcr_val |= SCFCR_MCE; - } - sci_out(port, SCFCR, fcr_val); -} -#elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721) -static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag) -{ - unsigned int fcr_val = 0; - 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 = ctrl_inw(PORT_PTCR); - ctrl_outw((data & 0xfc03), PORT_PTCR); - } else if (port->mapbase == 0xa4438000) { /* SCIF1 */ - /* Clear PVCR bit 9-2 */ - data = ctrl_inw(PORT_PVCR); - ctrl_outw((data & 0xfc03), PORT_PVCR); - } - fcr_val |= SCFCR_MCE; - } else { - if (port->mapbase == 0xa4430000) { /* SCIF0 */ - /* Clear PTCR bit 5-2; enable only tx and rx */ - data = ctrl_inw(PORT_PTCR); - ctrl_outw((data & 0xffc3), PORT_PTCR); - } else if (port->mapbase == 0xa4438000) { /* SCIF1 */ - /* Clear PVCR bit 5-2 */ - data = ctrl_inw(PORT_PVCR); - ctrl_outw((data & 0xffc3), PORT_PVCR); - } - } - sci_out(port, SCFCR, fcr_val); -} -#elif defined(CONFIG_CPU_SH3) -/* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */ -static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag) -{ - unsigned int fcr_val = 0; - unsigned short data; - - /* We need to set SCPCR to enable RTS/CTS */ - data = ctrl_inw(SCPCR); - /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/ - ctrl_outw(data & 0x0fcf, SCPCR); - - if (cflag & CRTSCTS) - fcr_val |= SCFCR_MCE; - else { - /* We need to set SCPCR to enable RTS/CTS */ - data = ctrl_inw(SCPCR); - /* Clear out SCP7MD1,0, SCP4MD1,0, - Set SCP6MD1,0 = {01} (output) */ - ctrl_outw((data & 0x0fcf) | 0x1000, SCPCR); - - data = ctrl_inb(SCPDR); - /* Set /RTS2 (bit6) = 0 */ - ctrl_outb(data & 0xbf, SCPDR); - } - - sci_out(port, SCFCR, fcr_val); -} -#elif defined(CONFIG_CPU_SUBTYPE_SH7722) -static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag) -{ - unsigned int fcr_val = 0; - unsigned short data; - - if (port->mapbase == 0xffe00000) { - data = ctrl_inw(PSCR); - data &= ~0x03cf; - if (cflag & CRTSCTS) - fcr_val |= SCFCR_MCE; - else - data |= 0x0340; - - ctrl_outw(data, PSCR); - } - /* SCIF1 and SCIF2 should be setup by board code */ - - sci_out(port, SCFCR, fcr_val); -} -#elif defined(CONFIG_CPU_SUBTYPE_SH7723) -static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag) -{ - /* Nothing to do here.. */ - sci_out(port, SCFCR, 0); -} -#else -/* For SH7750 */ -static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag) -{ - unsigned int fcr_val = 0; - - if (cflag & CRTSCTS) { - fcr_val |= SCFCR_MCE; - } else { -#if defined(CONFIG_CPU_SUBTYPE_SH7343) || defined(CONFIG_CPU_SUBTYPE_SH7366) - /* Nothing */ -#elif defined(CONFIG_CPU_SUBTYPE_SH7763) || \ - defined(CONFIG_CPU_SUBTYPE_SH7780) || \ - defined(CONFIG_CPU_SUBTYPE_SH7785) || \ - defined(CONFIG_CPU_SUBTYPE_SHX3) - ctrl_outw(0x0080, SCSPTR0); /* Set RTS = 1 */ -#else - ctrl_outw(0x0080, SCSPTR2); /* Set RTS = 1 */ -#endif - } - sci_out(port, SCFCR, fcr_val); -} -#endif - -#if defined(CONFIG_CPU_SUBTYPE_SH7760) || \ - defined(CONFIG_CPU_SUBTYPE_SH7780) || \ - defined(CONFIG_CPU_SUBTYPE_SH7785) -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 -#endif /* SCIF_ONLY || SCI_AND_SCIF */ - -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; - } - -#ifndef SCI_ONLY - if (port->type == PORT_SCIF) - count = scif_txroom(port); - else -#endif - count = sci_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 !defined(SCI_ONLY) - if (port->type == PORT_SCIF) { - sci_in(port, SCxSR); /* Dummy read */ - sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); - } -#endif - - 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 = (struct 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 !defined(SCI_ONLY) - if (port->type == PORT_SCIF) - count = scif_rxroom(port); - else -#endif - count = sci_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 */ - pr_debug("scif: 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; - pr_debug("sci: frame error\n"); - } else if (status&SCxSR_PER(port)) { - flag = TTY_PARITY; - pr_debug("sci: 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++; - pr_debug("sci: overrun error\n"); - } - - if (status & SCxSR_FER(port)) { - if (sci_rxd_in(port) == 0) { - /* Notify of BREAK */ - struct sci_port *sci_port = (struct 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; - pr_debug("sci: 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++; - pr_debug("sci: frame error\n"); - } - } - - if (status & SCxSR_PER(port)) { - /* parity error */ - if (tty_insert_flip_char(tty, 0, TTY_PARITY)) - copied++; - pr_debug("sci: parity error\n"); - } - - if (copied) - tty_flip_buffer_push(tty); - - 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 = &sci_ports[port->line]; - - 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++; - pr_debug("sci: BREAK detected\n"); - } - -#if defined(SCIF_ORER) - /* XXX: Handle SCIF overrun error */ - if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) { - sci_out(port, SCLSR, 0); - if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) { - copied++; - pr_debug("sci: overrun error\n"); - } - } -#endif - - if (copied) - tty_flip_buffer_push(tty); - - 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; - - spin_lock_irq(&port->lock); - sci_transmit_chars(port); - spin_unlock_irq(&port->lock); - - 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 { -#if defined(SCIF_ORER) - if((sci_in(port, SCLSR) & SCIF_ORER) != 0) { - struct tty_struct *tty = port->info->port.tty; - - sci_out(port, SCLSR, 0); - tty_insert_flip_char(tty, 0, TTY_OVERRUN); - tty_flip_buffer_push(tty); - pr_debug("scif: overrun error\n"); - } -#endif - 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; - struct uart_port *port = ptr; - - ssr_status = sci_in(port,SCxSR); - scr_status = sci_in(port,SCSCR); - - /* Tx Interrupt */ - if ((ssr_status & 0x0020) && (scr_status & 0x0080)) - sci_tx_interrupt(irq, ptr); - /* Rx Interrupt */ - if ((ssr_status & 0x0002) && (scr_status & 0x0040)) - sci_rx_interrupt(irq, ptr); - /* Error Interrupt */ - if ((ssr_status & 0x0080) && (scr_status & 0x0400)) - sci_er_interrupt(irq, ptr); - /* Break Interrupt */ - if ((ssr_status & 0x0010) && (scr_status & 0x0200)) - sci_br_interrupt(irq, ptr); - - return IRQ_HANDLED; -} - -#ifdef CONFIG_CPU_FREQ -/* - * 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 cpufreq_freqs *freqs = p; - int i; - - if ((phase == CPUFREQ_POSTCHANGE) || - (phase == CPUFREQ_RESUMECHANGE)){ - for (i = 0; i < SCI_NPORTS; i++) { - struct uart_port *port = &sci_ports[i].port; - struct clk *clk; - - /* - * Update the uartclk per-port if frequency has - * changed, since it will no longer necessarily be - * consistent with the old frequency. - * - * Really we want to be able to do something like - * uart_change_speed() or something along those lines - * here to implicitly reset the per-port baud rate.. - * - * Clean this up later.. - */ - clk = clk_get(NULL, "module_clk"); - port->uartclk = clk_get_rate(clk) * 16; - clk_put(clk); - } - - printk(KERN_INFO "%s: got a postchange notification " - "for cpu %d (old %d, new %d)\n", - __func__, freqs->cpu, freqs->old, freqs->new); - } - - return NOTIFY_OK; -} - -static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 }; -#endif /* CONFIG_CPU_FREQ */ - -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 (!port->irqs[0]) { - printk(KERN_ERR "sci: Cannot allocate irq.(IRQ=0)\n"); - return -ENODEV; - } - - if (request_irq(port->irqs[0], sci_mpxed_interrupt, - IRQF_DISABLED, "sci", port)) { - printk(KERN_ERR "sci: Cannot allocate irq.\n"); - return -ENODEV; - } - } else { - for (i = 0; i < ARRAY_SIZE(handlers); i++) { - if (!port->irqs[i]) - continue; - if (request_irq(port->irqs[i], handlers[i], - IRQF_DISABLED, desc[i], port)) { - printk(KERN_ERR "sci: Cannot 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]) { - if (!port->irqs[0]) - printk("sci: sci_free_irq error\n"); - else - 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 = &sci_ports[port->line]; - - if (s->enable) - s->enable(port); - -#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) - s->clk = clk_get(NULL, "module_clk"); -#endif - - 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 = &sci_ports[port->line]; - - sci_stop_rx(port); - sci_stop_tx(port); - sci_free_irq(s); - - if (s->disable) - s->disable(port); - -#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) - clk_put(s->clk); - s->clk = NULL; -#endif -} - -static void sci_set_termios(struct uart_port *port, struct ktermios *termios, - struct ktermios *old) -{ - struct sci_port *s = &sci_ports[port->line]; - unsigned int status, baud, smr_val; - int t; - - baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); - - switch (baud) { - case 0: - t = -1; - break; - default: - { -#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) - t = SCBRR_VALUE(baud, clk_get_rate(s->clk)); -#else - t = SCBRR_VALUE(baud); -#endif - break; - } - } - - do { - status = sci_in(port, SCxSR); - } while (!(status & SCxSR_TEND(port))); - - sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */ - -#if !defined(SCI_ONLY) - if (port->type == PORT_SCIF) - sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST); -#endif - - 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 */ - } - - if (likely(s->init_pins)) - s->init_pins(port, termios->c_cflag); - - 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_SCI: return "sci"; - case PORT_SCIF: return "scif"; - case PORT_IRDA: return "irda"; - } - - return 0; -} - -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 = &sci_ports[port->line]; - - port->type = s->type; - - switch (port->type) { - case PORT_SCI: - s->init_pins = sci_init_pins_sci; - break; - case PORT_SCIF: - s->init_pins = sci_init_pins_scif; - break; - case PORT_IRDA: - s->init_pins = sci_init_pins_irda; - break; - } - -#if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103) - if (port->mapbase == 0) - port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF"); - - port->membase = (void __iomem *)port->mapbase; -#endif -} - -static int sci_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - struct sci_port *s = &sci_ports[port->line]; - - 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, -}; - -static void __init sci_init_ports(void) -{ - static int first = 1; - int i; - - if (!first) - return; - - first = 0; - - for (i = 0; i < SCI_NPORTS; i++) { - sci_ports[i].port.ops = &sci_uart_ops; - sci_ports[i].port.iotype = UPIO_MEM; - sci_ports[i].port.line = i; - sci_ports[i].port.fifosize = 1; - -#if defined(__H8300H__) || defined(__H8300S__) -#ifdef __H8300S__ - sci_ports[i].enable = h8300_sci_enable; - sci_ports[i].disable = h8300_sci_disable; -#endif - sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK; -#elif defined(CONFIG_SUPERH64) - sci_ports[i].port.uartclk = current_cpu_data.module_clock * 16; -#else - /* - * XXX: We should use a proper SCI/SCIF clock - */ - { - struct clk *clk = clk_get(NULL, "module_clk"); - sci_ports[i].port.uartclk = clk_get_rate(clk) * 16; - clk_put(clk); - } -#endif - - sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i]; - sci_ports[i].break_timer.function = sci_break_timer; - - init_timer(&sci_ports[i].break_timer); - } -} - -int __init early_sci_setup(struct uart_port *port) -{ - if (unlikely(port->line > SCI_NPORTS)) - return -ENODEV; - - sci_init_ports(); - - sci_ports[port->line].port.membase = port->membase; - sci_ports[port->line].port.mapbase = port->mapbase; - sci_ports[port->line].port.type = port->type; - - return 0; -} - -#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE -/* - * 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) -{ - put_string(serial_console_port, s, count); -} - -static int __init serial_console_setup(struct console *co, char *options) -{ - 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; - - serial_console_port = &sci_ports[co->index]; - port = &serial_console_port->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; - if (!port->membase || !port->mapbase) - return -ENODEV; - - port->type = serial_console_port->type; - -#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) - if (!serial_console_port->clk) - serial_console_port->clk = clk_get(NULL, "module_clk"); -#endif - - if (port->flags & UPF_IOREMAP) - sci_config_port(port, 0); - - if (serial_console_port->enable) - serial_console_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 - return ret; -} - -static struct console serial_console = { - .name = "ttySC", - .device = uart_console_device, - .write = serial_console_write, - .setup = serial_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &sci_uart_driver, -}; - -static int __init sci_console_init(void) -{ - sci_init_ports(); - register_console(&serial_console); - return 0; -} -console_initcall(sci_console_init); -#endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */ - -#ifdef CONFIG_SH_KGDB_CONSOLE -/* - * FIXME: Most of this can go away.. at the moment, we rely on - * arch/sh/kernel/setup.c to do the command line parsing for kgdb, though - * most of that can easily be done here instead. - * - * For the time being, just accept the values that were parsed earlier.. - */ -static void __init kgdb_console_get_options(struct uart_port *port, int *baud, - int *parity, int *bits) -{ - *baud = kgdb_baud; - *parity = tolower(kgdb_parity); - *bits = kgdb_bits - '0'; -} - -/* - * The naming here is somewhat misleading, since kgdb_console_setup() takes - * care of the early-on initialization for kgdb, regardless of whether we - * actually use kgdb as a console or not. - * - * On the plus side, this lets us kill off the old kgdb_sci_setup() nonsense. - */ -int __init kgdb_console_setup(struct console *co, char *options) -{ - struct uart_port *port = &sci_ports[kgdb_portnum].port; - int baud = 38400; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - if (co->index != kgdb_portnum) - co->index = kgdb_portnum; - - kgdb_sci_port = &sci_ports[co->index]; - port = &kgdb_sci_port->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; - if (!port->membase || !port->mapbase) - return -ENODEV; - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - else - kgdb_console_get_options(port, &baud, &parity, &bits); - - kgdb_getchar = kgdb_sci_getchar; - kgdb_putchar = kgdb_sci_putchar; - - return uart_set_options(port, co, baud, parity, bits, flow); -} - -static struct console kgdb_console = { - .name = "ttySC", - .device = uart_console_device, - .write = kgdb_console_write, - .setup = kgdb_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &sci_uart_driver, -}; - -/* Register the KGDB console so we get messages (d'oh!) */ -static int __init kgdb_console_init(void) -{ - sci_init_ports(); - register_console(&kgdb_console); - return 0; -} -console_initcall(kgdb_console_init); -#endif /* CONFIG_SH_KGDB_CONSOLE */ - -#if defined(CONFIG_SH_KGDB_CONSOLE) -#define SCI_CONSOLE &kgdb_console -#elif 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, -}; - -/* - * 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; - int i; - - for (i = 0; p && p->flags != 0; p++, i++) { - struct sci_port *sciport = &sci_ports[i]; - - /* Sanity check */ - if (unlikely(i == SCI_NPORTS)) { - dev_notice(&dev->dev, "Attempting to register port " - "%d when only %d are available.\n", - i+1, SCI_NPORTS); - dev_notice(&dev->dev, "Consider bumping " - "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n"); - break; - } - - sciport->port.mapbase = p->mapbase; - - /* - * For the simple (and majority of) cases where we don't need - * to do any remapping, just cast the cookie directly. - */ - if (p->mapbase && !p->membase && !(p->flags & UPF_IOREMAP)) - p->membase = (void __iomem *)p->mapbase; - - sciport->port.membase = p->membase; - - sciport->port.irq = p->irqs[SCIx_TXI_IRQ]; - sciport->port.flags = p->flags; - sciport->port.dev = &dev->dev; - - sciport->type = sciport->port.type = p->type; - - memcpy(&sciport->irqs, &p->irqs, sizeof(p->irqs)); - - uart_add_one_port(&sci_uart_driver, &sciport->port); - } - -#if defined(CONFIG_SH_KGDB) && !defined(CONFIG_SH_KGDB_CONSOLE) - kgdb_sci_port = &sci_ports[kgdb_portnum]; - kgdb_getchar = kgdb_sci_getchar; - kgdb_putchar = kgdb_sci_putchar; -#endif - -#ifdef CONFIG_CPU_FREQ - cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER); - dev_info(&dev->dev, "CPU frequency notifier registered\n"); -#endif - -#ifdef CONFIG_SH_STANDARD_BIOS - sh_bios_gdb_detach(); -#endif - - return 0; -} - -static int __devexit sci_remove(struct platform_device *dev) -{ - int i; - - for (i = 0; i < SCI_NPORTS; i++) - uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port); - - return 0; -} - -static int sci_suspend(struct platform_device *dev, pm_message_t state) -{ - int i; - - for (i = 0; i < SCI_NPORTS; i++) { - struct sci_port *p = &sci_ports[i]; - - if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev) - uart_suspend_port(&sci_uart_driver, &p->port); - } - - return 0; -} - -static int sci_resume(struct platform_device *dev) -{ - int i; - - for (i = 0; i < SCI_NPORTS; i++) { - struct sci_port *p = &sci_ports[i]; - - if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev) - uart_resume_port(&sci_uart_driver, &p->port); - } - - return 0; -} - -static struct platform_driver sci_driver = { - .probe = sci_probe, - .remove = __devexit_p(sci_remove), - .suspend = sci_suspend, - .resume = sci_resume, - .driver = { - .name = "sh-sci", - .owner = THIS_MODULE, - }, -}; - -static int __init sci_init(void) -{ - int ret; - - printk(banner); - - sci_init_ports(); - - 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"); |