diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/arm/mach-omap1/Kconfig | 16 | ||||
| -rw-r--r-- | arch/arm/mach-omap1/timer32k.c | 96 | ||||
| -rw-r--r-- | arch/arm/plat-omap/Kconfig | 17 | ||||
| -rw-r--r-- | arch/arm/plat-omap/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/plat-omap/counter_32k.c | 114 | ||||
| -rw-r--r-- | arch/arm/plat-omap/include/plat/counter-32k.h | 1 |
6 files changed, 110 insertions, 136 deletions
diff --git a/arch/arm/mach-omap1/Kconfig b/arch/arm/mach-omap1/Kconfig index 208c700c2455..04155b5ce978 100644 --- a/arch/arm/mach-omap1/Kconfig +++ b/arch/arm/mach-omap1/Kconfig @@ -53,6 +53,22 @@ config OMAP_MUX_WARNINGS to change the pin multiplexing setup. When there are no warnings printed, it's safe to deselect OMAP_MUX for your product. +config OMAP_32K_TIMER + bool "Use 32KHz timer" + depends on ARCH_OMAP16XX + default ARCH_OMAP16XX + help + Select this option if you want to enable the OMAP 32KHz timer. + This timer saves power compared to the OMAP_MPU_TIMER, and has + support for no tick during idle. The 32KHz timer provides less + intra-tick resolution than OMAP_MPU_TIMER. The 32KHz timer is + currently only available for OMAP16XX, 24XX, 34XX, OMAP4/5 and DRA7XX. + + On OMAP2PLUS this value is only used for CONFIG_HZ and + CLOCK_TICK_RATE compile time calculation. + The actual timer selection is done in the board file + through the (DT_)MACHINE_START structure. + comment "OMAP Board Type" config MACH_OMAP_INNOVATOR diff --git a/arch/arm/mach-omap1/timer32k.c b/arch/arm/mach-omap1/timer32k.c index 780fdf03c3ce..11958ccd894d 100644 --- a/arch/arm/mach-omap1/timer32k.c +++ b/arch/arm/mach-omap1/timer32k.c @@ -45,15 +45,13 @@ #include <linux/clocksource.h> #include <linux/clockchips.h> #include <linux/io.h> +#include <linux/sched_clock.h> #include <asm/irq.h> #include <asm/mach/irq.h> #include <asm/mach/time.h> -#include <plat/counter-32k.h> - #include <mach/hardware.h> - #include "common.h" /* @@ -159,6 +157,98 @@ static __init void omap_init_32k_timer(void) OMAP_32K_TICKS_PER_SEC, 1, 0xfffffffe); } +/* OMAP2_32KSYNCNT_CR_OFF: offset of 32ksync counter register */ +#define OMAP2_32KSYNCNT_REV_OFF 0x0 +#define OMAP2_32KSYNCNT_REV_SCHEME (0x3 << 30) +#define OMAP2_32KSYNCNT_CR_OFF_LOW 0x10 +#define OMAP2_32KSYNCNT_CR_OFF_HIGH 0x30 + +/* + * 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 *sync32k_cnt_reg; + +static u64 notrace omap_32k_read_sched_clock(void) +{ + return sync32k_cnt_reg ? readl_relaxed(sync32k_cnt_reg) : 0; +} + +/** + * omap_read_persistent_clock64 - Return time from a persistent clock. + * + * Reads the time from a source which isn't disabled during PM, the + * 32k sync timer. Convert the cycles elapsed since last read into + * nsecs and adds to a monotonically increasing timespec64. + */ +static struct timespec64 persistent_ts; +static cycles_t cycles; +static unsigned int persistent_mult, persistent_shift; + +static void omap_read_persistent_clock64(struct timespec64 *ts) +{ + unsigned long long nsecs; + cycles_t last_cycles; + + last_cycles = cycles; + cycles = sync32k_cnt_reg ? readl_relaxed(sync32k_cnt_reg) : 0; + + nsecs = clocksource_cyc2ns(cycles - last_cycles, + persistent_mult, persistent_shift); + + timespec64_add_ns(&persistent_ts, nsecs); + + *ts = persistent_ts; +} + +/** + * 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) +{ + int ret; + + /* + * 32k sync Counter IP register offsets vary between the + * highlander version and the legacy ones. + * The 'SCHEME' bits(30-31) of the revision register is used + * to identify the version. + */ + if (readl_relaxed(vbase + OMAP2_32KSYNCNT_REV_OFF) & + OMAP2_32KSYNCNT_REV_SCHEME) + sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF_HIGH; + else + sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF_LOW; + + /* + * 120000 rough estimate from the calculations in + * __clocksource_update_freq_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; + } + + sched_clock_register(omap_32k_read_sched_clock, 32, 32768); + register_persistent_clock(omap_read_persistent_clock64); + pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n"); + + return 0; +} + /* * --------------------------------------------------------------------------- * Timer initialization diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig index 272670ef1e92..dfa19d5030e3 100644 --- a/arch/arm/plat-omap/Kconfig +++ b/arch/arm/plat-omap/Kconfig @@ -72,23 +72,6 @@ config OMAP_MPU_TIMER timer provides more intra-tick resolution than the 32KHz timer, but consumes more power. -config OMAP_32K_TIMER - bool "Use 32KHz timer" - depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS - default y if (ARCH_OMAP16XX || ARCH_OMAP2PLUS) - help - Select this option if you want to enable the OMAP 32KHz timer. - This timer saves power compared to the OMAP_MPU_TIMER, and has - support for no tick during idle. The 32KHz timer provides less - intra-tick resolution than OMAP_MPU_TIMER. The 32KHz timer is - currently only available for OMAP16XX, 24XX, 34XX, OMAP4/5 and DRA7XX. - - On OMAP2PLUS this value is only used for CONFIG_HZ and - CLOCK_TICK_RATE compile time calculation. - The actual timer selection is done in the board file - through the (DT_)MACHINE_START structure. - - config OMAP3_L2_AUX_SECURE_SAVE_RESTORE bool "OMAP3 HS/EMU save and restore for L2 AUX control register" depends on ARCH_OMAP3 && PM diff --git a/arch/arm/plat-omap/Makefile b/arch/arm/plat-omap/Makefile index 371f2ed00eda..98a7b607873a 100644 --- a/arch/arm/plat-omap/Makefile +++ b/arch/arm/plat-omap/Makefile @@ -6,7 +6,7 @@ ccflags-$(CONFIG_ARCH_MULTIPLATFORM) := -I$(srctree)/arch/arm/plat-omap/include # Common support -obj-y := sram.o dma.o counter_32k.o +obj-y := sram.o dma.o # omap_device support (OMAP2+ only at the moment) diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c deleted file mode 100644 index 7a729ade2105..000000000000 --- a/arch/arm/plat-omap/counter_32k.c +++ /dev/null @@ -1,114 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * OMAP 32ksynctimer/counter_32k-related code - * - * Copyright (C) 2009 Texas Instruments - * Copyright (C) 2010 Nokia Corporation - * Tony Lindgren <tony@atomide.com> - * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com> - * - * NOTE: This timer is not the same timer as the old OMAP1 MPU timer. - */ -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/clk.h> -#include <linux/err.h> -#include <linux/io.h> -#include <linux/clocksource.h> -#include <linux/sched_clock.h> - -#include <asm/mach/time.h> - -#include <plat/counter-32k.h> - -/* OMAP2_32KSYNCNT_CR_OFF: offset of 32ksync counter register */ -#define OMAP2_32KSYNCNT_REV_OFF 0x0 -#define OMAP2_32KSYNCNT_REV_SCHEME (0x3 << 30) -#define OMAP2_32KSYNCNT_CR_OFF_LOW 0x10 -#define OMAP2_32KSYNCNT_CR_OFF_HIGH 0x30 - -/* - * 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 *sync32k_cnt_reg; - -static u64 notrace omap_32k_read_sched_clock(void) -{ - return sync32k_cnt_reg ? readl_relaxed(sync32k_cnt_reg) : 0; -} - -/** - * omap_read_persistent_clock64 - Return time from a persistent clock. - * - * Reads the time from a source which isn't disabled during PM, the - * 32k sync timer. Convert the cycles elapsed since last read into - * nsecs and adds to a monotonically increasing timespec64. - */ -static struct timespec64 persistent_ts; -static cycles_t cycles; -static unsigned int persistent_mult, persistent_shift; - -static void omap_read_persistent_clock64(struct timespec64 *ts) -{ - unsigned long long nsecs; - cycles_t last_cycles; - - last_cycles = cycles; - cycles = sync32k_cnt_reg ? readl_relaxed(sync32k_cnt_reg) : 0; - - nsecs = clocksource_cyc2ns(cycles - last_cycles, - persistent_mult, persistent_shift); - - timespec64_add_ns(&persistent_ts, nsecs); - - *ts = persistent_ts; -} - -/** - * 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) -{ - int ret; - - /* - * 32k sync Counter IP register offsets vary between the - * highlander version and the legacy ones. - * The 'SCHEME' bits(30-31) of the revision register is used - * to identify the version. - */ - if (readl_relaxed(vbase + OMAP2_32KSYNCNT_REV_OFF) & - OMAP2_32KSYNCNT_REV_SCHEME) - sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF_HIGH; - else - sync32k_cnt_reg = vbase + OMAP2_32KSYNCNT_CR_OFF_LOW; - - /* - * 120000 rough estimate from the calculations in - * __clocksource_update_freq_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; - } - - sched_clock_register(omap_32k_read_sched_clock, 32, 32768); - register_persistent_clock(omap_read_persistent_clock64); - pr_info("OMAP clocksource: 32k_counter at 32768 Hz\n"); - - return 0; -} diff --git a/arch/arm/plat-omap/include/plat/counter-32k.h b/arch/arm/plat-omap/include/plat/counter-32k.h deleted file mode 100644 index da000d482ff2..000000000000 --- a/arch/arm/plat-omap/include/plat/counter-32k.h +++ /dev/null @@ -1 +0,0 @@ -int omap_init_clocksource_32k(void __iomem *vbase); |