diff options
| -rw-r--r-- | arch/arm/mach-omap1/timer32k.c | 19 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/timer.c | 112 | ||||
| -rw-r--r-- | arch/arm/plat-omap/counter_32k.c | 91 | ||||
| -rw-r--r-- | arch/arm/plat-omap/include/plat/common.h | 2 |
4 files changed, 147 insertions, 77 deletions
diff --git a/arch/arm/mach-omap1/timer32k.c b/arch/arm/mach-omap1/timer32k.c index e3613a8bcd9..eae49c3980c 100644 --- a/arch/arm/mach-omap1/timer32k.c +++ b/arch/arm/mach-omap1/timer32k.c @@ -71,6 +71,7 @@ /* 16xx specific defines */ #define OMAP1_32K_TIMER_BASE 0xfffb9000 +#define OMAP1_32KSYNC_TIMER_BASE 0xfffbc400 #define OMAP1_32K_TIMER_CR 0x08 #define OMAP1_32K_TIMER_TVR 0x00 #define OMAP1_32K_TIMER_TCR 0x04 @@ -186,8 +187,22 @@ int __init omap_32k_timer_init(void) { int ret = -ENODEV; - if (cpu_is_omap16xx()) - ret = omap_init_clocksource_32k(); + if (cpu_is_omap16xx()) { + void __iomem *base; + struct clk *sync32k_ick; + + base = ioremap(OMAP1_32KSYNC_TIMER_BASE, SZ_1K); + if (!base) { + pr_err("32k_counter: failed to map base addr\n"); + return -ENODEV; + } + + sync32k_ick = clk_get(NULL, "omap_32ksync_ick"); + if (!IS_ERR(sync32k_ick)) + clk_enable(sync32k_ick); + + ret = omap_init_clocksource_32k(base); + } if (!ret) omap_init_32k_timer(); diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c index 105829e403b..840929bd9da 100644 --- a/arch/arm/mach-omap2/timer.c +++ b/arch/arm/mach-omap2/timer.c @@ -236,22 +236,8 @@ static void __init omap2_gp_clockevent_init(int gptimer_id, } /* Clocksource code */ - -#ifdef CONFIG_OMAP_32K_TIMER -/* - * When 32k-timer is enabled, don't use GPTimer for clocksource - * instead, just leave default clocksource which uses the 32k - * sync counter. See clocksource setup in plat-omap/counter_32k.c - */ - -static void __init omap2_gp_clocksource_init(int unused, const char *dummy) -{ - omap_init_clocksource_32k(); -} - -#else - static struct omap_dm_timer clksrc; +static bool use_gptimer_clksrc; /* * clocksource @@ -278,7 +264,46 @@ static u32 notrace dmtimer_read_sched_clock(void) } /* Setup free-running counter for clocksource */ -static void __init omap2_gp_clocksource_init(int gptimer_id, +static int __init omap2_sync32k_clocksource_init(void) +{ + int ret; + struct omap_hwmod *oh; + void __iomem *vbase; + const char *oh_name = "counter_32k"; + + /* + * First check hwmod data is available for sync32k counter + */ + oh = omap_hwmod_lookup(oh_name); + if (!oh || oh->slaves_cnt == 0) + return -ENODEV; + + omap_hwmod_setup_one(oh_name); + + vbase = omap_hwmod_get_mpu_rt_va(oh); + if (!vbase) { + pr_warn("%s: failed to get counter_32k resource\n", __func__); + return -ENXIO; + } + + ret = omap_hwmod_enable(oh); + if (ret) { + pr_warn("%s: failed to enable counter_32k module (%d)\n", + __func__, ret); + return ret; + } + + ret = omap_init_clocksource_32k(vbase); + if (ret) { + pr_warn("%s: failed to initialize counter_32k as a clocksource (%d)\n", + __func__, ret); + omap_hwmod_idle(oh); + } + + return ret; +} + +static void __init omap2_gptimer_clocksource_init(int gptimer_id, const char *fck_source) { int res; @@ -286,9 +311,6 @@ static void __init omap2_gp_clocksource_init(int gptimer_id, res = omap_dm_timer_init_one(&clksrc, gptimer_id, fck_source); BUG_ON(res); - pr_info("OMAP clocksource: GPTIMER%d at %lu Hz\n", - gptimer_id, clksrc.rate); - __omap_dm_timer_load_start(&clksrc, OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0, 1); setup_sched_clock(dmtimer_read_sched_clock, 32, clksrc.rate); @@ -296,15 +318,36 @@ static void __init omap2_gp_clocksource_init(int gptimer_id, if (clocksource_register_hz(&clocksource_gpt, clksrc.rate)) pr_err("Could not register clocksource %s\n", clocksource_gpt.name); + else + pr_info("OMAP clocksource: GPTIMER%d at %lu Hz\n", + gptimer_id, clksrc.rate); +} + +static void __init omap2_clocksource_init(int gptimer_id, + const char *fck_source) +{ + /* + * First give preference to kernel parameter configuration + * by user (clocksource="gp_timer"). + * + * In case of missing kernel parameter for clocksource, + * first check for availability for 32k-sync timer, in case + * of failure in finding 32k_counter module or registering + * it as clocksource, execution will fallback to gp-timer. + */ + if (use_gptimer_clksrc == true) + omap2_gptimer_clocksource_init(gptimer_id, fck_source); + else if (omap2_sync32k_clocksource_init()) + /* Fall back to gp-timer code */ + omap2_gptimer_clocksource_init(gptimer_id, fck_source); } -#endif #define OMAP_SYS_TIMER_INIT(name, clkev_nr, clkev_src, \ clksrc_nr, clksrc_src) \ static void __init omap##name##_timer_init(void) \ { \ omap2_gp_clockevent_init((clkev_nr), clkev_src); \ - omap2_gp_clocksource_init((clksrc_nr), clksrc_src); \ + omap2_clocksource_init((clksrc_nr), clksrc_src); \ } #define OMAP_SYS_TIMER(name) \ @@ -335,7 +378,7 @@ static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, static void __init omap4_timer_init(void) { omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE); - omap2_gp_clocksource_init(2, OMAP4_MPU_SOURCE); + omap2_clocksource_init(2, OMAP4_MPU_SOURCE); #ifdef CONFIG_LOCAL_TIMERS /* Local timers are not supprted on OMAP4430 ES1.0 */ if (omap_rev() != OMAP4430_REV_ES1_0) { @@ -503,3 +546,28 @@ static int __init omap2_dm_timer_init(void) return 0; } arch_initcall(omap2_dm_timer_init); + +/** + * omap2_override_clocksource - clocksource override with user configuration + * + * Allows user to override default clocksource, using kernel parameter + * clocksource="gp_timer" (For all OMAP2PLUS architectures) + * + * Note that, here we are using same standard kernel parameter "clocksource=", + * and not introducing any OMAP specific interface. + */ +static int __init omap2_override_clocksource(char *str) +{ + if (!str) + return 0; + /* + * For OMAP architecture, we only have two options + * - sync_32k (default) + * - gp_timer (sys_clk based) + */ + if (!strcmp(str, "gp_timer")) + use_gptimer_clksrc = true; + + return 0; +} +early_param("clocksource", omap2_override_clocksource); diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c index 5068fe5a691..b2f634ba7bc 100644 --- a/arch/arm/plat-omap/counter_32k.c +++ b/arch/arm/plat-omap/counter_32k.c @@ -27,19 +27,20 @@ #include <plat/clock.h> +/* OMAP2_32KSYNCNT_CR_OFF: offset of 32ksync counter register */ +#define OMAP2_32KSYNCNT_CR_OFF 0x10 + /* * 32KHz clocksource ... always available, on pretty most chips except * OMAP 730 and 1510. Other timers could be used as clocksources, with * higher resolution in free-running counter modes (e.g. 12 MHz xtal), * but systems won't necessarily want to spend resources that way. */ -static void __iomem *timer_32k_base; - -#define OMAP16XX_TIMER_32K_SYNCHRONIZED 0xfffbc410 +static void __iomem *sync32k_cnt_reg; static u32 notrace omap_32k_read_sched_clock(void) { - return timer_32k_base ? __raw_readl(timer_32k_base) : 0; + return sync32k_cnt_reg ? __raw_readl(sync32k_cnt_reg) : 0; } /** @@ -59,7 +60,7 @@ void read_persistent_clock(struct timespec *ts) struct timespec *tsp = &persistent_ts; last_cycles = cycles; - cycles = timer_32k_base ? __raw_readl(timer_32k_base) : 0; + cycles = sync32k_cnt_reg ? __raw_readl(sync32k_cnt_reg) : 0; delta = cycles - last_cycles; nsecs = clocksource_cyc2ns(delta, persistent_mult, persistent_shift); @@ -68,54 +69,40 @@ void read_persistent_clock(struct timespec *ts) *ts = *tsp; } -int __init omap_init_clocksource_32k(void) +/** + * omap_init_clocksource_32k - setup and register counter 32k as a + * kernel clocksource + * @pbase: base addr of counter_32k module + * @size: size of counter_32k to map + * + * Returns 0 upon success or negative error code upon failure. + * + */ +int __init omap_init_clocksource_32k(void __iomem *vbase) { - static char err[] __initdata = KERN_ERR - "%s: can't register clocksource!\n"; - - if (cpu_is_omap16xx() || cpu_class_is_omap2()) { - u32 pbase; - unsigned long size = SZ_4K; - void __iomem *base; - struct clk *sync_32k_ick; - - if (cpu_is_omap16xx()) { - pbase = OMAP16XX_TIMER_32K_SYNCHRONIZED; - size = SZ_1K; - } else if (cpu_is_omap2420()) - pbase = OMAP2420_32KSYNCT_BASE + 0x10; - else if (cpu_is_omap2430()) - pbase = OMAP2430_32KSYNCT_BASE + 0x10; - else if (cpu_is_omap34xx()) - pbase = OMAP3430_32KSYNCT_BASE + 0x10; - else if (cpu_is_omap44xx()) - pbase = OMAP4430_32KSYNCT_BASE + 0x10; - else - return -ENODEV; - - /* For this to work we must have a static mapping in io.c for this area */ - base = ioremap(pbase, size); - if (!base) - return -ENODEV; - - sync_32k_ick = clk_get(NULL, "omap_32ksync_ick"); - if (!IS_ERR(sync_32k_ick)) - clk_enable(sync_32k_ick); - - timer_32k_base = base; - - /* - * 120000 rough estimate from the calculations in - * __clocksource_updatefreq_scale. - */ - clocks_calc_mult_shift(&persistent_mult, &persistent_shift, - 32768, NSEC_PER_SEC, 120000); - - if (clocksource_mmio_init(base, "32k_counter", 32768, 250, 32, - clocksource_mmio_readl_up)) - printk(err, "32k_counter"); - - setup_sched_clock(omap_32k_read_sched_clock, 32, 32768); + int ret; + + /* + * 32k sync Counter register offset is at 0x10 + */ + sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF; + + /* + * 120000 rough estimate from the calculations in + * __clocksource_updatefreq_scale. + */ + clocks_calc_mult_shift(&persistent_mult, &persistent_shift, + 32768, NSEC_PER_SEC, 120000); + + ret = clocksource_mmio_init(sync32k_cnt_reg, "32k_counter", 32768, + 250, 32, clocksource_mmio_readl_up); + if (ret) { + pr_err("32k_counter: can't register clocksource\n"); + return ret; } + + setup_sched_clock(omap_32k_read_sched_clock, 32, 32768); + pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n"); + return 0; } diff --git a/arch/arm/plat-omap/include/plat/common.h b/arch/arm/plat-omap/include/plat/common.h index b4d7ec3fbfb..55c514be382 100644 --- a/arch/arm/plat-omap/include/plat/common.h +++ b/arch/arm/plat-omap/include/plat/common.h @@ -30,7 +30,7 @@ #include <plat/i2c.h> #include <plat/omap_hwmod.h> -extern int __init omap_init_clocksource_32k(void); +extern int __init omap_init_clocksource_32k(void __iomem *vbase); extern void omap_reserve(void); extern int omap_dss_reset(struct omap_hwmod *); |