diff options
Diffstat (limited to 'arch/cris/arch-v32/kernel')
| -rw-r--r-- | arch/cris/arch-v32/kernel/debugport.c | 82 | ||||
| -rw-r--r-- | arch/cris/arch-v32/kernel/time.c | 29 |
2 files changed, 74 insertions, 37 deletions
diff --git a/arch/cris/arch-v32/kernel/debugport.c b/arch/cris/arch-v32/kernel/debugport.c index 610909b003f6..02e33ebe51ec 100644 --- a/arch/cris/arch-v32/kernel/debugport.c +++ b/arch/cris/arch-v32/kernel/debugport.c @@ -3,7 +3,9 @@ */ #include <linux/console.h> +#include <linux/kernel.h> #include <linux/init.h> +#include <linux/string.h> #include <hwregs/reg_rdwr.h> #include <hwregs/reg_map.h> #include <hwregs/ser_defs.h> @@ -65,6 +67,7 @@ struct dbg_port ports[] = }, #endif }; + static struct dbg_port *port = #if defined(CONFIG_ETRAX_DEBUG_PORT0) &ports[0]; @@ -97,14 +100,19 @@ static struct dbg_port *kgdb_port = #endif #endif -static void -start_port(struct dbg_port* p) +static void start_port(struct dbg_port *p) { - if (!p) - return; + /* Set up serial port registers */ + reg_ser_rw_tr_ctrl tr_ctrl = {0}; + reg_ser_rw_tr_dma_en tr_dma_en = {0}; - if (p->started) + 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}; + + if (!p || p->started) return; + p->started = 1; if (p->nbr == 1) @@ -118,36 +126,24 @@ start_port(struct dbg_port* p) crisv32_pinmux_alloc_fixed(pinmux_ser4); #endif - /* 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') - { + 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') - { + } 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) - { + if (p->bits == 7) { tr_ctrl.data_bits = regk_ser_bits7; rec_ctrl.data_bits = regk_ser_bits7; } @@ -161,8 +157,7 @@ start_port(struct dbg_port* p) #ifdef CONFIG_ETRAX_KGDB /* Use polling to get a single character from the kernel debug port */ -int -getDebugChar(void) +int getDebugChar(void) { reg_ser_rs_stat_din stat; reg_ser_rw_ack_intr ack_intr = { 0 }; @@ -179,8 +174,7 @@ getDebugChar(void) } /* Use polling to put a single character to the kernel debug port */ -void -putDebugChar(int val) +void putDebugChar(int val) { reg_ser_r_stat_din stat; do { @@ -190,12 +184,48 @@ putDebugChar(int val) } #endif /* CONFIG_ETRAX_KGDB */ +static void __init early_putch(int c) +{ + reg_ser_r_stat_din stat; + /* 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, c); +} + +static void __init +early_console_write(struct console *con, const char *s, unsigned n) +{ + extern void reset_watchdog(void); + int i; + + /* Send data. */ + for (i = 0; i < n; i++) { + /* TODO: the '\n' -> '\n\r' translation should be done at the + receiver. Remove it when the serial driver removes it. */ + if (s[i] == '\n') + early_putch('\r'); + early_putch(s[i]); + reset_watchdog(); + } +} + +static struct console early_console_dev __initdata = { + .name = "early", + .write = early_console_write, + .flags = CON_PRINTBUFFER | CON_BOOT, + .index = -1 +}; + /* Register console for printk's, etc. */ -int __init -init_etrax_debug(void) +int __init init_etrax_debug(void) { start_port(port); + /* Register an early console if a debug port was chosen. */ + register_console(&early_console_dev); + #ifdef CONFIG_ETRAX_KGDB start_port(kgdb_port); #endif /* CONFIG_ETRAX_KGDB */ diff --git a/arch/cris/arch-v32/kernel/time.c b/arch/cris/arch-v32/kernel/time.c index ee66866538f8..eb74dabbeb96 100644 --- a/arch/cris/arch-v32/kernel/time.c +++ b/arch/cris/arch-v32/kernel/time.c @@ -14,6 +14,7 @@ #include <linux/init.h> #include <linux/threads.h> #include <linux/cpufreq.h> +#include <linux/mm.h> #include <asm/types.h> #include <asm/signal.h> #include <asm/io.h> @@ -56,7 +57,6 @@ static int __init etrax_init_cont_rotime(void) } arch_initcall(etrax_init_cont_rotime); - unsigned long timer_regs[NR_CPUS] = { regi_timer0, @@ -68,9 +68,8 @@ unsigned long timer_regs[NR_CPUS] = extern int set_rtc_mmss(unsigned long nowtime); #ifdef CONFIG_CPU_FREQ -static int -cris_time_freq_notifier(struct notifier_block *nb, unsigned long val, - void *data); +static int cris_time_freq_notifier(struct notifier_block *nb, + unsigned long val, void *data); static struct notifier_block cris_time_freq_notifier_block = { .notifier_call = cris_time_freq_notifier, @@ -87,7 +86,6 @@ unsigned long get_ns_in_jiffie(void) return ns; } - /* From timer MDS describing the hardware watchdog: * 4.3.1 Watchdog Operation * The watchdog timer is an 8-bit timer with a configurable start value. @@ -109,11 +107,18 @@ static short int watchdog_key = 42; /* arbitrary 7 bit number */ * is used though, so set this really low. */ #define WATCHDOG_MIN_FREE_PAGES 8 +/* for reliable NICE_DOGGY behaviour */ +static int bite_in_progress; + void reset_watchdog(void) { #if defined(CONFIG_ETRAX_WATCHDOG) reg_timer_rw_wd_ctrl wd_ctrl = { 0 }; +#if defined(CONFIG_ETRAX_WATCHDOG_NICE_DOGGY) + if (unlikely(bite_in_progress)) + return; +#endif /* Only keep watchdog happy as long as we have memory left! */ if(nr_free_pages() > WATCHDOG_MIN_FREE_PAGES) { /* Reset the watchdog with the inverse of the old key */ @@ -148,7 +153,9 @@ void handle_watchdog_bite(struct pt_regs *regs) #if defined(CONFIG_ETRAX_WATCHDOG) extern int cause_of_death; + nmi_enter(); oops_in_progress = 1; + bite_in_progress = 1; printk(KERN_WARNING "Watchdog bite\n"); /* Check if forced restart or unexpected watchdog */ @@ -170,6 +177,7 @@ void handle_watchdog_bite(struct pt_regs *regs) printk(KERN_WARNING "Oops: bitten by watchdog\n"); show_registers(regs); oops_in_progress = 0; + printk("\n"); /* Flush mtdoops. */ #ifndef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY reset_watchdog(); #endif @@ -202,7 +210,7 @@ static inline irqreturn_t timer_interrupt(int irq, void *dev_id) /* Reset watchdog otherwise it resets us! */ reset_watchdog(); - /* Update statistics. */ + /* Update statistics. */ update_process_times(user_mode(regs)); cris_do_profile(regs); /* Save profiling information */ @@ -213,7 +221,7 @@ static inline irqreturn_t timer_interrupt(int irq, void *dev_id) /* Call the real timer interrupt handler */ xtime_update(1); - return IRQ_HANDLED; + return IRQ_HANDLED; } /* Timer is IRQF_SHARED so drivers can add stuff to the timer irq chain. */ @@ -293,14 +301,13 @@ void __init time_init(void) #ifdef CONFIG_CPU_FREQ cpufreq_register_notifier(&cris_time_freq_notifier_block, - CPUFREQ_TRANSITION_NOTIFIER); + CPUFREQ_TRANSITION_NOTIFIER); #endif } #ifdef CONFIG_CPU_FREQ -static int -cris_time_freq_notifier(struct notifier_block *nb, unsigned long val, - void *data) +static int cris_time_freq_notifier(struct notifier_block *nb, + unsigned long val, void *data) { struct cpufreq_freqs *freqs = data; if (val == CPUFREQ_POSTCHANGE) { |