--- zzzz-none-000/linux-3.10.107/drivers/clocksource/arm_arch_timer.c 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/drivers/clocksource/arm_arch_timer.c 2021-02-04 17:41:59.000000000 +0000 @@ -13,16 +13,46 @@ #include #include #include +#include #include +#include #include #include +#include #include +#include +#include +#include #include #include #include +#define CNTTIDR 0x08 +#define CNTTIDR_VIRT(n) (BIT(1) << ((n) * 4)) + +#define CNTVCT_LO 0x08 +#define CNTVCT_HI 0x0c +#define CNTFRQ 0x10 +#define CNTP_TVAL 0x28 +#define CNTP_CTL 0x2c +#define CNTV_TVAL 0x38 +#define CNTV_CTL 0x3c + +#define ARCH_CP15_TIMER BIT(0) +#define ARCH_MEM_TIMER BIT(1) +static unsigned arch_timers_present __initdata; + +static void __iomem *arch_counter_base; + +struct arch_timer { + void __iomem *base; + struct clock_event_device evt; +}; + +#define to_arch_timer(e) container_of(e, struct arch_timer, evt) + static u32 arch_timer_rate; enum ppi_nr { @@ -38,19 +68,84 @@ static struct clock_event_device __percpu *arch_timer_evt; static bool arch_timer_use_virtual = true; +static bool arch_timer_c3stop; +static bool arch_timer_mem_use_virtual; /* * Architected system timer support. */ -static inline irqreturn_t timer_handler(const int access, +static __always_inline +void arch_timer_reg_write(int access, enum arch_timer_reg reg, u32 val, + struct clock_event_device *clk) +{ + if (access == ARCH_TIMER_MEM_PHYS_ACCESS) { + struct arch_timer *timer = to_arch_timer(clk); + switch (reg) { + case ARCH_TIMER_REG_CTRL: + writel_relaxed(val, timer->base + CNTP_CTL); + break; + case ARCH_TIMER_REG_TVAL: + writel_relaxed(val, timer->base + CNTP_TVAL); + break; + } + } else if (access == ARCH_TIMER_MEM_VIRT_ACCESS) { + struct arch_timer *timer = to_arch_timer(clk); + switch (reg) { + case ARCH_TIMER_REG_CTRL: + writel_relaxed(val, timer->base + CNTV_CTL); + break; + case ARCH_TIMER_REG_TVAL: + writel_relaxed(val, timer->base + CNTV_TVAL); + break; + } + } else { + arch_timer_reg_write_cp15(access, reg, val); + } +} + +static __always_inline +u32 arch_timer_reg_read(int access, enum arch_timer_reg reg, + struct clock_event_device *clk) +{ + u32 val; + + if (access == ARCH_TIMER_MEM_PHYS_ACCESS) { + struct arch_timer *timer = to_arch_timer(clk); + switch (reg) { + case ARCH_TIMER_REG_CTRL: + val = readl_relaxed(timer->base + CNTP_CTL); + break; + case ARCH_TIMER_REG_TVAL: + val = readl_relaxed(timer->base + CNTP_TVAL); + break; + } + } else if (access == ARCH_TIMER_MEM_VIRT_ACCESS) { + struct arch_timer *timer = to_arch_timer(clk); + switch (reg) { + case ARCH_TIMER_REG_CTRL: + val = readl_relaxed(timer->base + CNTV_CTL); + break; + case ARCH_TIMER_REG_TVAL: + val = readl_relaxed(timer->base + CNTV_TVAL); + break; + } + } else { + val = arch_timer_reg_read_cp15(access, reg); + } + + return val; +} + +static __always_inline irqreturn_t timer_handler(const int access, struct clock_event_device *evt) { unsigned long ctrl; - ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL); + + ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL, evt); if (ctrl & ARCH_TIMER_CTRL_IT_STAT) { ctrl |= ARCH_TIMER_CTRL_IT_MASK; - arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl); + arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, evt); evt->event_handler(evt); return IRQ_HANDLED; } @@ -72,78 +167,180 @@ return timer_handler(ARCH_TIMER_PHYS_ACCESS, evt); } -static inline void timer_set_mode(const int access, int mode) +static irqreturn_t arch_timer_handler_phys_mem(int irq, void *dev_id) +{ + struct clock_event_device *evt = dev_id; + + return timer_handler(ARCH_TIMER_MEM_PHYS_ACCESS, evt); +} + +static irqreturn_t arch_timer_handler_virt_mem(int irq, void *dev_id) +{ + struct clock_event_device *evt = dev_id; + + return timer_handler(ARCH_TIMER_MEM_VIRT_ACCESS, evt); +} + +static __always_inline int timer_shutdown(const int access, + struct clock_event_device *clk) { unsigned long ctrl; - switch (mode) { - case CLOCK_EVT_MODE_UNUSED: - case CLOCK_EVT_MODE_SHUTDOWN: - ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL); - ctrl &= ~ARCH_TIMER_CTRL_ENABLE; - arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl); - break; - default: - break; - } + + ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL, clk); + ctrl &= ~ARCH_TIMER_CTRL_ENABLE; + arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, clk); + + return 0; +} + +static int arch_timer_shutdown_virt(struct clock_event_device *clk) +{ + return timer_shutdown(ARCH_TIMER_VIRT_ACCESS, clk); } -static void arch_timer_set_mode_virt(enum clock_event_mode mode, - struct clock_event_device *clk) +static int arch_timer_shutdown_phys(struct clock_event_device *clk) { - timer_set_mode(ARCH_TIMER_VIRT_ACCESS, mode); + return timer_shutdown(ARCH_TIMER_PHYS_ACCESS, clk); } -static void arch_timer_set_mode_phys(enum clock_event_mode mode, - struct clock_event_device *clk) +static int arch_timer_shutdown_virt_mem(struct clock_event_device *clk) { - timer_set_mode(ARCH_TIMER_PHYS_ACCESS, mode); + return timer_shutdown(ARCH_TIMER_MEM_VIRT_ACCESS, clk); } -static inline void set_next_event(const int access, unsigned long evt) +static int arch_timer_shutdown_phys_mem(struct clock_event_device *clk) +{ + return timer_shutdown(ARCH_TIMER_MEM_PHYS_ACCESS, clk); +} + +static __always_inline void set_next_event(const int access, unsigned long evt, + struct clock_event_device *clk) { unsigned long ctrl; - ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL); + ctrl = arch_timer_reg_read(access, ARCH_TIMER_REG_CTRL, clk); ctrl |= ARCH_TIMER_CTRL_ENABLE; ctrl &= ~ARCH_TIMER_CTRL_IT_MASK; - arch_timer_reg_write(access, ARCH_TIMER_REG_TVAL, evt); - arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl); + arch_timer_reg_write(access, ARCH_TIMER_REG_TVAL, evt, clk); + arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, clk); } static int arch_timer_set_next_event_virt(unsigned long evt, - struct clock_event_device *unused) + struct clock_event_device *clk) { - set_next_event(ARCH_TIMER_VIRT_ACCESS, evt); + set_next_event(ARCH_TIMER_VIRT_ACCESS, evt, clk); return 0; } static int arch_timer_set_next_event_phys(unsigned long evt, - struct clock_event_device *unused) + struct clock_event_device *clk) { - set_next_event(ARCH_TIMER_PHYS_ACCESS, evt); + set_next_event(ARCH_TIMER_PHYS_ACCESS, evt, clk); return 0; } -static int __cpuinit arch_timer_setup(struct clock_event_device *clk) +static int arch_timer_set_next_event_virt_mem(unsigned long evt, + struct clock_event_device *clk) { - clk->features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_C3STOP; - clk->name = "arch_sys_timer"; - clk->rating = 450; - if (arch_timer_use_virtual) { - clk->irq = arch_timer_ppi[VIRT_PPI]; - clk->set_mode = arch_timer_set_mode_virt; - clk->set_next_event = arch_timer_set_next_event_virt; + set_next_event(ARCH_TIMER_MEM_VIRT_ACCESS, evt, clk); + return 0; +} + +static int arch_timer_set_next_event_phys_mem(unsigned long evt, + struct clock_event_device *clk) +{ + set_next_event(ARCH_TIMER_MEM_PHYS_ACCESS, evt, clk); + return 0; +} + +static void __arch_timer_setup(unsigned type, + struct clock_event_device *clk) +{ + clk->features = CLOCK_EVT_FEAT_ONESHOT; + + if (type == ARCH_CP15_TIMER) { + if (arch_timer_c3stop) + clk->features |= CLOCK_EVT_FEAT_C3STOP; + clk->name = "arch_sys_timer"; + clk->rating = 450; + clk->cpumask = cpumask_of(smp_processor_id()); + if (arch_timer_use_virtual) { + clk->irq = arch_timer_ppi[VIRT_PPI]; + clk->set_state_shutdown = arch_timer_shutdown_virt; + clk->set_next_event = arch_timer_set_next_event_virt; + } else { + clk->irq = arch_timer_ppi[PHYS_SECURE_PPI]; + clk->set_state_shutdown = arch_timer_shutdown_phys; + clk->set_next_event = arch_timer_set_next_event_phys; + } } else { - clk->irq = arch_timer_ppi[PHYS_SECURE_PPI]; - clk->set_mode = arch_timer_set_mode_phys; - clk->set_next_event = arch_timer_set_next_event_phys; + clk->features |= CLOCK_EVT_FEAT_DYNIRQ; + clk->name = "arch_mem_timer"; + clk->rating = 400; + clk->cpumask = cpu_all_mask; + if (arch_timer_mem_use_virtual) { + clk->set_state_shutdown = arch_timer_shutdown_virt_mem; + clk->set_next_event = + arch_timer_set_next_event_virt_mem; + } else { + clk->set_state_shutdown = arch_timer_shutdown_phys_mem; + clk->set_next_event = + arch_timer_set_next_event_phys_mem; + } } - clk->cpumask = cpumask_of(smp_processor_id()); + clk->set_state_shutdown(clk); - clk->set_mode(CLOCK_EVT_MODE_SHUTDOWN, NULL); + clockevents_config_and_register(clk, arch_timer_rate, 0xf, 0x7fffffff); +} - clockevents_config_and_register(clk, arch_timer_rate, - 0xf, 0x7fffffff); +static void arch_timer_evtstrm_enable(int divider) +{ + u32 cntkctl = arch_timer_get_cntkctl(); + + cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK; + /* Set the divider and enable virtual event stream */ + cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT) + | ARCH_TIMER_VIRT_EVT_EN; + arch_timer_set_cntkctl(cntkctl); + elf_hwcap |= HWCAP_EVTSTRM; +#ifdef CONFIG_COMPAT + compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM; +#endif +} + +static void arch_timer_configure_evtstream(void) +{ + int evt_stream_div, pos; + + /* Find the closest power of two to the divisor */ + evt_stream_div = arch_timer_rate / ARCH_TIMER_EVT_STREAM_FREQ; + pos = fls(evt_stream_div); + if (pos > 1 && !(evt_stream_div & (1 << (pos - 2)))) + pos--; + /* enable event stream */ + arch_timer_evtstrm_enable(min(pos, 15)); +} + +static void arch_counter_set_user_access(void) +{ + u32 cntkctl = arch_timer_get_cntkctl(); + + /* Disable user access to the timers and the physical counter */ + /* Also disable virtual event stream */ + cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN + | ARCH_TIMER_USR_VT_ACCESS_EN + | ARCH_TIMER_VIRT_EVT_EN + | ARCH_TIMER_USR_PCT_ACCESS_EN); + + /* Enable user access to the virtual counter */ + cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN; + + arch_timer_set_cntkctl(cntkctl); +} + +static int arch_timer_setup(struct clock_event_device *clk) +{ + __arch_timer_setup(ARCH_CP15_TIMER, clk); if (arch_timer_use_virtual) enable_percpu_irq(arch_timer_ppi[VIRT_PPI], 0); @@ -154,31 +351,51 @@ } arch_counter_set_user_access(); + if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER_EVTSTREAM)) + arch_timer_configure_evtstream(); return 0; } -static int arch_timer_available(void) +static void +arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) { - u32 freq; - - if (arch_timer_rate == 0) { - freq = arch_timer_get_cntfrq(); - - /* Check the timer frequency. */ - if (freq == 0) { - pr_warn("Architected timer frequency not available\n"); - return -EINVAL; - } + /* Who has more than one independent system counter? */ + if (arch_timer_rate) + return; - arch_timer_rate = freq; + /* + * Try to determine the frequency from the device tree or CNTFRQ, + * if ACPI is enabled, get the frequency from CNTFRQ ONLY. + */ + if (!acpi_disabled || + of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { + if (cntbase) + arch_timer_rate = readl_relaxed(cntbase + CNTFRQ); + else + arch_timer_rate = arch_timer_get_cntfrq(); } - pr_info_once("Architected local timer running at %lu.%02luMHz (%s).\n", + /* Check the timer frequency. */ + if (arch_timer_rate == 0) + pr_warn("Architected timer frequency not available\n"); +} + +static void arch_timer_banner(unsigned type) +{ + pr_info("Architected %s%s%s timer(s) running at %lu.%02luMHz (%s%s%s).\n", + type & ARCH_CP15_TIMER ? "cp15" : "", + type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? " and " : "", + type & ARCH_MEM_TIMER ? "mmio" : "", (unsigned long)arch_timer_rate / 1000000, (unsigned long)(arch_timer_rate / 10000) % 100, - arch_timer_use_virtual ? "virt" : "phys"); - return 0; + type & ARCH_CP15_TIMER ? + arch_timer_use_virtual ? "virt" : "phys" : + "", + type == (ARCH_CP15_TIMER | ARCH_MEM_TIMER) ? "/" : "", + type & ARCH_MEM_TIMER ? + arch_timer_mem_use_virtual ? "virt" : "phys" : + ""); } u32 arch_timer_get_rate(void) @@ -186,19 +403,35 @@ return arch_timer_rate; } -u64 arch_timer_read_counter(void) +static u64 arch_counter_get_cntvct_mem(void) { - return arch_counter_get_cntvct(); + u32 vct_lo, vct_hi, tmp_hi; + + do { + vct_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); + vct_lo = readl_relaxed(arch_counter_base + CNTVCT_LO); + tmp_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); + } while (vct_hi != tmp_hi); + + return ((u64) vct_hi << 32) | vct_lo; } +/* + * Default to cp15 based access because arm64 uses this function for + * sched_clock() before DT is probed and the cp15 method is guaranteed + * to exist on arm64. arm doesn't use this before DT is probed so even + * if we don't have the cp15 accessors we won't have a problem. + */ +u64 (*arch_timer_read_counter)(void) = arch_counter_get_cntvct; + static cycle_t arch_counter_read(struct clocksource *cs) { - return arch_counter_get_cntvct(); + return arch_timer_read_counter(); } static cycle_t arch_counter_read_cc(const struct cyclecounter *cc) { - return arch_counter_get_cntvct(); + return arch_timer_read_counter(); } static struct clocksource clocksource_counter = { @@ -206,7 +439,7 @@ .rating = 400, .read = arch_counter_read, .mask = CLOCKSOURCE_MASK(56), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, + .flags = CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_SUSPEND_NONSTOP, }; static struct cyclecounter cyclecounter = { @@ -221,7 +454,38 @@ return &timecounter; } -static void __cpuinit arch_timer_stop(struct clock_event_device *clk) +static void __init arch_counter_register(unsigned type) +{ + u64 start_count; + + /* Register the CP15 based counter if we have one */ + if (type & ARCH_CP15_TIMER) { + if (IS_ENABLED(CONFIG_ARM64) || arch_timer_use_virtual) + arch_timer_read_counter = arch_counter_get_cntvct; + else + arch_timer_read_counter = arch_counter_get_cntpct; + } else { + arch_timer_read_counter = arch_counter_get_cntvct_mem; + + /* If the clocksource name is "arch_sys_counter" the + * VDSO will attempt to read the CP15-based counter. + * Ensure this does not happen when CP15-based + * counter is not available. + */ + clocksource_counter.name = "arch_mem_counter"; + } + + start_count = arch_timer_read_counter(); + clocksource_register_hz(&clocksource_counter, arch_timer_rate); + cyclecounter.mult = clocksource_counter.mult; + cyclecounter.shift = clocksource_counter.shift; + timecounter_init(&timecounter, &cyclecounter, start_count); + + /* 56 bits minimum, so we assume worst case rollover */ + sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate); +} + +static void arch_timer_stop(struct clock_event_device *clk) { pr_debug("arch_timer_teardown disable IRQ%d cpu #%d\n", clk->irq, smp_processor_id()); @@ -234,10 +498,10 @@ disable_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI]); } - clk->set_mode(CLOCK_EVT_MODE_UNUSED, clk); + clk->set_state_shutdown(clk); } -static int __cpuinit arch_timer_cpu_notify(struct notifier_block *self, +static int arch_timer_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) { /* @@ -256,31 +520,48 @@ return NOTIFY_OK; } -static struct notifier_block arch_timer_cpu_nb __cpuinitdata = { +static struct notifier_block arch_timer_cpu_nb = { .notifier_call = arch_timer_cpu_notify, }; +#ifdef CONFIG_CPU_PM +static unsigned int saved_cntkctl; +static int arch_timer_cpu_pm_notify(struct notifier_block *self, + unsigned long action, void *hcpu) +{ + if (action == CPU_PM_ENTER) + saved_cntkctl = arch_timer_get_cntkctl(); + else if (action == CPU_PM_ENTER_FAILED || action == CPU_PM_EXIT) + arch_timer_set_cntkctl(saved_cntkctl); + return NOTIFY_OK; +} + +static struct notifier_block arch_timer_cpu_pm_notifier = { + .notifier_call = arch_timer_cpu_pm_notify, +}; + +static int __init arch_timer_cpu_pm_init(void) +{ + return cpu_pm_register_notifier(&arch_timer_cpu_pm_notifier); +} +#else +static int __init arch_timer_cpu_pm_init(void) +{ + return 0; +} +#endif + static int __init arch_timer_register(void) { int err; int ppi; - err = arch_timer_available(); - if (err) - goto out; - arch_timer_evt = alloc_percpu(struct clock_event_device); if (!arch_timer_evt) { err = -ENOMEM; goto out; } - clocksource_register_hz(&clocksource_counter, arch_timer_rate); - cyclecounter.mult = clocksource_counter.mult; - cyclecounter.shift = clocksource_counter.shift; - timecounter_init(&timecounter, &cyclecounter, - arch_counter_get_cntvct()); - if (arch_timer_use_virtual) { ppi = arch_timer_ppi[VIRT_PPI]; err = request_percpu_irq(ppi, arch_timer_handler_virt, @@ -309,11 +590,17 @@ if (err) goto out_free_irq; + err = arch_timer_cpu_pm_init(); + if (err) + goto out_unreg_notify; + /* Immediately configure the timer on the boot CPU */ arch_timer_setup(this_cpu_ptr(arch_timer_evt)); return 0; +out_unreg_notify: + unregister_cpu_notifier(&arch_timer_cpu_nb); out_free_irq: if (arch_timer_use_virtual) free_percpu_irq(arch_timer_ppi[VIRT_PPI], arch_timer_evt); @@ -331,25 +618,78 @@ return err; } -static void __init arch_timer_init(struct device_node *np) +static int __init arch_timer_mem_register(void __iomem *base, unsigned int irq) { - u32 freq; - int i; + int ret; + irq_handler_t func; + struct arch_timer *t; - if (arch_timer_get_rate()) { - pr_warn("arch_timer: multiple nodes in dt, skipping\n"); - return; + t = kzalloc(sizeof(*t), GFP_KERNEL); + if (!t) + return -ENOMEM; + + t->base = base; + t->evt.irq = irq; + __arch_timer_setup(ARCH_MEM_TIMER, &t->evt); + + if (arch_timer_mem_use_virtual) + func = arch_timer_handler_virt_mem; + else + func = arch_timer_handler_phys_mem; + + ret = request_irq(irq, func, IRQF_TIMER, "arch_mem_timer", &t->evt); + if (ret) { + pr_err("arch_timer: Failed to request mem timer irq\n"); + kfree(t); } - /* Try to determine the frequency from the device tree or CNTFRQ */ - if (!of_property_read_u32(np, "clock-frequency", &freq)) - arch_timer_rate = freq; + return ret; +} - for (i = PHYS_SECURE_PPI; i < MAX_TIMER_PPI; i++) - arch_timer_ppi[i] = irq_of_parse_and_map(np, i); +static const struct of_device_id arch_timer_of_match[] __initconst = { + { .compatible = "arm,armv7-timer", }, + { .compatible = "arm,armv8-timer", }, + {}, +}; + +static const struct of_device_id arch_timer_mem_of_match[] __initconst = { + { .compatible = "arm,armv7-timer-mem", }, + {}, +}; - of_node_put(np); +static bool __init +arch_timer_needs_probing(int type, const struct of_device_id *matches) +{ + struct device_node *dn; + bool needs_probing = false; + + dn = of_find_matching_node(NULL, matches); + if (dn && of_device_is_available(dn) && !(arch_timers_present & type)) + needs_probing = true; + of_node_put(dn); + + return needs_probing; +} + +static void __init arch_timer_common_init(void) +{ + unsigned mask = ARCH_CP15_TIMER | ARCH_MEM_TIMER; + + /* Wait until both nodes are probed if we have two timers */ + if ((arch_timers_present & mask) != mask) { + if (arch_timer_needs_probing(ARCH_MEM_TIMER, arch_timer_mem_of_match)) + return; + if (arch_timer_needs_probing(ARCH_CP15_TIMER, arch_timer_of_match)) + return; + } + arch_timer_banner(arch_timers_present); + arch_counter_register(arch_timers_present); + arch_timer_arch_init(); +} + +static void __init arch_timer_init(void) +{ /* * If HYP mode is available, we know that the physical timer * has been configured to be accessible from PL1. Use it, so @@ -369,7 +709,160 @@ } arch_timer_register(); - arch_timer_arch_init(); + arch_timer_common_init(); +} + +static void __init arch_timer_of_init(struct device_node *np) +{ + int i; + + if (arch_timers_present & ARCH_CP15_TIMER) { + pr_warn("arch_timer: multiple nodes in dt, skipping\n"); + return; + } + + arch_timers_present |= ARCH_CP15_TIMER; + for (i = PHYS_SECURE_PPI; i < MAX_TIMER_PPI; i++) + arch_timer_ppi[i] = irq_of_parse_and_map(np, i); + + arch_timer_detect_rate(NULL, np); + + arch_timer_c3stop = !of_property_read_bool(np, "always-on"); + + /* + * If we cannot rely on firmware initializing the timer registers then + * we should use the physical timers instead. + */ + if (IS_ENABLED(CONFIG_ARM) && + of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) + arch_timer_use_virtual = false; + + arch_timer_init(); +} +CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_of_init); +CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_of_init); + +static void __init arch_timer_mem_init(struct device_node *np) +{ + struct device_node *frame, *best_frame = NULL; + void __iomem *cntctlbase, *base; + unsigned int irq; + u32 cnttidr; + + arch_timers_present |= ARCH_MEM_TIMER; + cntctlbase = of_iomap(np, 0); + if (!cntctlbase) { + pr_err("arch_timer: Can't find CNTCTLBase\n"); + return; + } + + cnttidr = readl_relaxed(cntctlbase + CNTTIDR); + iounmap(cntctlbase); + + /* + * Try to find a virtual capable frame. Otherwise fall back to a + * physical capable frame. + */ + for_each_available_child_of_node(np, frame) { + int n; + + if (of_property_read_u32(frame, "frame-number", &n)) { + pr_err("arch_timer: Missing frame-number\n"); + of_node_put(best_frame); + of_node_put(frame); + return; + } + + if (cnttidr & CNTTIDR_VIRT(n)) { + of_node_put(best_frame); + best_frame = frame; + arch_timer_mem_use_virtual = true; + break; + } + of_node_put(best_frame); + best_frame = of_node_get(frame); + } + + base = arch_counter_base = of_iomap(best_frame, 0); + if (!base) { + pr_err("arch_timer: Can't map frame's registers\n"); + of_node_put(best_frame); + return; + } + + if (arch_timer_mem_use_virtual) + irq = irq_of_parse_and_map(best_frame, 1); + else + irq = irq_of_parse_and_map(best_frame, 0); + of_node_put(best_frame); + if (!irq) { + pr_err("arch_timer: Frame missing %s irq", + arch_timer_mem_use_virtual ? "virt" : "phys"); + return; + } + + arch_timer_detect_rate(base, np); + arch_timer_mem_register(base, irq); + arch_timer_common_init(); +} +CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem", + arch_timer_mem_init); + +#ifdef CONFIG_ACPI +static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags) +{ + int trigger, polarity; + + if (!interrupt) + return 0; + + trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE + : ACPI_LEVEL_SENSITIVE; + + polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW + : ACPI_ACTIVE_HIGH; + + return acpi_register_gsi(NULL, interrupt, trigger, polarity); +} + +/* Initialize per-processor generic timer */ +static int __init arch_timer_acpi_init(struct acpi_table_header *table) +{ + struct acpi_table_gtdt *gtdt; + + if (arch_timers_present & ARCH_CP15_TIMER) { + pr_warn("arch_timer: already initialized, skipping\n"); + return -EINVAL; + } + + gtdt = container_of(table, struct acpi_table_gtdt, header); + + arch_timers_present |= ARCH_CP15_TIMER; + + arch_timer_ppi[PHYS_SECURE_PPI] = + map_generic_timer_interrupt(gtdt->secure_el1_interrupt, + gtdt->secure_el1_flags); + + arch_timer_ppi[PHYS_NONSECURE_PPI] = + map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt, + gtdt->non_secure_el1_flags); + + arch_timer_ppi[VIRT_PPI] = + map_generic_timer_interrupt(gtdt->virtual_timer_interrupt, + gtdt->virtual_timer_flags); + + arch_timer_ppi[HYP_PPI] = + map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt, + gtdt->non_secure_el2_flags); + + /* Get the frequency from CNTFRQ */ + arch_timer_detect_rate(NULL, NULL); + + /* Always-on capability */ + arch_timer_c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); + + arch_timer_init(); + return 0; } -CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_init); -CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_init); +CLOCKSOURCE_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init); +#endif