diff options
Diffstat (limited to 'arch/cris/arch-v32/kernel/debugport.c')
| -rw-r--r-- | arch/cris/arch-v32/kernel/debugport.c | 461 |
1 files changed, 461 insertions, 0 deletions
diff --git a/arch/cris/arch-v32/kernel/debugport.c b/arch/cris/arch-v32/kernel/debugport.c new file mode 100644 index 000000000000..ffc1ebf2dfee --- /dev/null +++ b/arch/cris/arch-v32/kernel/debugport.c @@ -0,0 +1,461 @@ +/* + * Copyright (C) 2003, Axis Communications AB. + */ + +#include <linux/config.h> +#include <linux/console.h> +#include <linux/init.h> +#include <linux/major.h> +#include <linux/delay.h> +#include <linux/tty.h> +#include <asm/system.h> +#include <asm/io.h> +#include <asm/arch/hwregs/ser_defs.h> +#include <asm/arch/hwregs/dma_defs.h> +#include <asm/arch/pinmux.h> + +#include <asm/irq.h> +#include <asm/arch/hwregs/intr_vect_defs.h> + +struct dbg_port +{ + unsigned char nbr; + unsigned long instance; + unsigned int started; + unsigned long baudrate; + unsigned char parity; + unsigned int bits; +}; + +struct dbg_port ports[] = +{ + { + 0, + regi_ser0, + 0, + 115200, + 'N', + 8 + }, + { + 1, + regi_ser1, + 0, + 115200, + 'N', + 8 + }, + { + 2, + regi_ser2, + 0, + 115200, + 'N', + 8 + }, + { + 3, + regi_ser3, + 0, + 115200, + 'N', + 8 + } +}; +static struct dbg_port *port = +#if defined(CONFIG_ETRAX_DEBUG_PORT0) +&ports[0]; +#elif defined(CONFIG_ETRAX_DEBUG_PORT1) +&ports[1]; +#elif defined(CONFIG_ETRAX_DEBUG_PORT2) +&ports[2]; +#elif defined(CONFIG_ETRAX_DEBUG_PORT3) +&ports[3]; +#else +NULL; +#endif + +#ifdef CONFIG_ETRAX_KGDB +static struct dbg_port *kgdb_port = +#if defined(CONFIG_ETRAX_KGDB_PORT0) +&ports[0]; +#elif defined(CONFIG_ETRAX_KGDB_PORT1) +&ports[1]; +#elif defined(CONFIG_ETRAX_KGDB_PORT2) +&ports[2]; +#elif defined(CONFIG_ETRAX_KGDB_PORT3) +&ports[3]; +#else +NULL; +#endif +#endif + +#ifdef CONFIG_ETRAXFS_SIM +extern void print_str( const char *str ); +static char buffer[1024]; +static char msg[] = "Debug: "; +static int buffer_pos = sizeof(msg) - 1; +#endif + +extern struct tty_driver *serial_driver; + +static void +start_port(struct dbg_port* p) +{ + if (!p) + return; + + if (p->started) + return; + p->started = 1; + + if (p->nbr == 1) + crisv32_pinmux_alloc_fixed(pinmux_ser1); + else if (p->nbr == 2) + crisv32_pinmux_alloc_fixed(pinmux_ser2); + else if (p->nbr == 3) + crisv32_pinmux_alloc_fixed(pinmux_ser3); + + /* Set up serial port registers */ + reg_ser_rw_tr_ctrl tr_ctrl = {0}; + reg_ser_rw_tr_dma_en tr_dma_en = {0}; + + reg_ser_rw_rec_ctrl rec_ctrl = {0}; + reg_ser_rw_tr_baud_div tr_baud_div = {0}; + reg_ser_rw_rec_baud_div rec_baud_div = {0}; + + tr_ctrl.base_freq = rec_ctrl.base_freq = regk_ser_f29_493; + tr_dma_en.en = rec_ctrl.dma_mode = regk_ser_no; + tr_baud_div.div = rec_baud_div.div = 29493000 / p->baudrate / 8; + tr_ctrl.en = rec_ctrl.en = 1; + + if (p->parity == 'O') + { + tr_ctrl.par_en = regk_ser_yes; + tr_ctrl.par = regk_ser_odd; + rec_ctrl.par_en = regk_ser_yes; + rec_ctrl.par = regk_ser_odd; + } + else if (p->parity == 'E') + { + tr_ctrl.par_en = regk_ser_yes; + tr_ctrl.par = regk_ser_even; + rec_ctrl.par_en = regk_ser_yes; + rec_ctrl.par = regk_ser_odd; + } + + if (p->bits == 7) + { + tr_ctrl.data_bits = regk_ser_bits7; + rec_ctrl.data_bits = regk_ser_bits7; + } + + REG_WR (ser, p->instance, rw_tr_baud_div, tr_baud_div); + REG_WR (ser, p->instance, rw_rec_baud_div, rec_baud_div); + REG_WR (ser, p->instance, rw_tr_dma_en, tr_dma_en); + REG_WR (ser, p->instance, rw_tr_ctrl, tr_ctrl); + REG_WR (ser, p->instance, rw_rec_ctrl, rec_ctrl); +} + +/* No debug */ +#ifdef CONFIG_ETRAX_DEBUG_PORT_NULL + +static void +console_write(struct console *co, const char *buf, unsigned int len) +{ + return; +} + +/* Target debug */ +#elif !defined(CONFIG_ETRAXFS_SIM) + +static void +console_write_direct(struct console *co, const char *buf, unsigned int len) +{ + int i; + reg_ser_r_stat_din stat; + reg_ser_rw_tr_dma_en tr_dma_en, old; + + /* Switch to manual mode */ + tr_dma_en = old = REG_RD (ser, port->instance, rw_tr_dma_en); + if (tr_dma_en.en == regk_ser_yes) { + tr_dma_en.en = regk_ser_no; + REG_WR(ser, port->instance, rw_tr_dma_en, tr_dma_en); + } + + /* Send data */ + for (i = 0; i < len; i++) { + /* LF -> CRLF */ + if (buf[i] == '\n') { + do { + stat = REG_RD (ser, port->instance, r_stat_din); + } while (!stat.tr_rdy); + REG_WR_INT (ser, port->instance, rw_dout, '\r'); + } + /* Wait until transmitter is ready and send.*/ + do { + stat = REG_RD (ser, port->instance, r_stat_din); + } while (!stat.tr_rdy); + REG_WR_INT (ser, port->instance, rw_dout, buf[i]); + } + + /* Restore mode */ + if (tr_dma_en.en != old.en) + REG_WR(ser, port->instance, rw_tr_dma_en, old); +} + +static void +console_write(struct console *co, const char *buf, unsigned int len) +{ + if (!port) + return; + console_write_direct(co, buf, len); +} + + + +#else + +/* VCS debug */ + +static void +console_write(struct console *co, const char *buf, unsigned int len) +{ + char* pos; + pos = memchr(buf, '\n', len); + if (pos) { + int l = ++pos - buf; + memcpy(buffer + buffer_pos, buf, l); + memcpy(buffer, msg, sizeof(msg) - 1); + buffer[buffer_pos + l] = '\0'; + print_str(buffer); + buffer_pos = sizeof(msg) - 1; + if (pos - buf != len) { + memcpy(buffer + buffer_pos, pos, len - l); + buffer_pos += len - l; + } + } else { + memcpy(buffer + buffer_pos, buf, len); + buffer_pos += len; + } +} + +#endif + +int raw_printk(const char *fmt, ...) +{ + static char buf[1024]; + int printed_len; + va_list args; + va_start(args, fmt); + printed_len = vsnprintf(buf, sizeof(buf), fmt, args); + va_end(args); + console_write(NULL, buf, strlen(buf)); + return printed_len; +} + +void +stupid_debug(char* buf) +{ + console_write(NULL, buf, strlen(buf)); +} + +#ifdef CONFIG_ETRAX_KGDB +/* Use polling to get a single character from the kernel debug port */ +int +getDebugChar(void) +{ + reg_ser_rs_status_data stat; + reg_ser_rw_ack_intr ack_intr = { 0 }; + + do { + stat = REG_RD(ser, kgdb_instance, rs_status_data); + } while (!stat.data_avail); + + /* Ack the data_avail interrupt. */ + ack_intr.data_avail = 1; + REG_WR(ser, kgdb_instance, rw_ack_intr, ack_intr); + + return stat.data; +} + +/* Use polling to put a single character to the kernel debug port */ +void +putDebugChar(int val) +{ + reg_ser_r_status_data stat; + do { + stat = REG_RD (ser, kgdb_instance, r_status_data); + } while (!stat.tr_ready); + REG_WR (ser, kgdb_instance, rw_data_out, REG_TYPE_CONV(reg_ser_rw_data_out, int, val)); +} +#endif /* CONFIG_ETRAX_KGDB */ + +static int __init +console_setup(struct console *co, char *options) +{ + char* s; + + if (options) { + port = &ports[co->index]; + port->baudrate = 115200; + port->parity = 'N'; + port->bits = 8; + port->baudrate = simple_strtoul(options, NULL, 10); + s = options; + while(*s >= '0' && *s <= '9') + s++; + if (*s) port->parity = *s++; + if (*s) port->bits = *s++ - '0'; + port->started = 0; + start_port(port); + } + return 0; +} + +/* This is a dummy serial device that throws away anything written to it. + * This is used when no debug output is wanted. + */ +static struct tty_driver dummy_driver; + +static int dummy_open(struct tty_struct *tty, struct file * filp) +{ + return 0; +} + +static void dummy_close(struct tty_struct *tty, struct file * filp) +{ +} + +static int dummy_write(struct tty_struct * tty, + const unsigned char *buf, int count) +{ + return count; +} + +static int +dummy_write_room(struct tty_struct *tty) +{ + return 8192; +} + +void __init +init_dummy_console(void) +{ + memset(&dummy_driver, 0, sizeof(struct tty_driver)); + dummy_driver.driver_name = "serial"; + dummy_driver.name = "ttyS"; + dummy_driver.major = TTY_MAJOR; + dummy_driver.minor_start = 68; + dummy_driver.num = 1; /* etrax100 has 4 serial ports */ + dummy_driver.type = TTY_DRIVER_TYPE_SERIAL; + dummy_driver.subtype = SERIAL_TYPE_NORMAL; + dummy_driver.init_termios = tty_std_termios; + dummy_driver.init_termios.c_cflag = + B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */ + dummy_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS; + + dummy_driver.open = dummy_open; + dummy_driver.close = dummy_close; + dummy_driver.write = dummy_write; + dummy_driver.write_room = dummy_write_room; + if (tty_register_driver(&dummy_driver)) + panic("Couldn't register dummy serial driver\n"); +} + +static struct tty_driver* +crisv32_console_device(struct console* co, int *index) +{ + if (port) + *index = port->nbr; + return port ? serial_driver : &dummy_driver; +} + +static struct console sercons = { + name : "ttyS", + write: console_write, + read : NULL, + device : crisv32_console_device, + unblank : NULL, + setup : console_setup, + flags : CON_PRINTBUFFER, + index : -1, + cflag : 0, + next : NULL +}; +static struct console sercons0 = { + name : "ttyS", + write: console_write, + read : NULL, + device : crisv32_console_device, + unblank : NULL, + setup : console_setup, + flags : CON_PRINTBUFFER, + index : 0, + cflag : 0, + next : NULL +}; + +static struct console sercons1 = { + name : "ttyS", + write: console_write, + read : NULL, + device : crisv32_console_device, + unblank : NULL, + setup : console_setup, + flags : CON_PRINTBUFFER, + index : 1, + cflag : 0, + next : NULL +}; +static struct console sercons2 = { + name : "ttyS", + write: console_write, + read : NULL, + device : crisv32_console_device, + unblank : NULL, + setup : console_setup, + flags : CON_PRINTBUFFER, + index : 2, + cflag : 0, + next : NULL +}; +static struct console sercons3 = { + name : "ttyS", + write: console_write, + read : NULL, + device : crisv32_console_device, + unblank : NULL, + setup : console_setup, + flags : CON_PRINTBUFFER, + index : 3, + cflag : 0, + next : NULL +}; + +/* Register console for printk's, etc. */ +int __init +init_etrax_debug(void) +{ + static int first = 1; + + if (!first) { + unregister_console(&sercons); + register_console(&sercons0); + register_console(&sercons1); + register_console(&sercons2); + register_console(&sercons3); + init_dummy_console(); + return 0; + } + first = 0; + register_console(&sercons); + start_port(port); + +#ifdef CONFIG_ETRAX_KGDB + start_port(kgdb_port); +#endif /* CONFIG_ETRAX_KGDB */ + return 0; +} + +__initcall(init_etrax_debug); |