#define CNTV_TVAL 0x38
#define CNTV_CTL 0x3c
-#define ARCH_TIMER_TYPE_CP15 BIT(0)
-#define ARCH_TIMER_TYPE_MEM BIT(1)
static unsigned arch_timers_present __initdata;
static void __iomem *arch_counter_base;
#define to_arch_timer(e) container_of(e, struct arch_timer, evt)
static u32 arch_timer_rate;
-
-enum arch_timer_ppi_nr {
- ARCH_TIMER_PHYS_SECURE_PPI,
- ARCH_TIMER_PHYS_NONSECURE_PPI,
- ARCH_TIMER_VIRT_PPI,
- ARCH_TIMER_HYP_PPI,
- ARCH_TIMER_MAX_TIMER_PPI
-};
-
static int arch_timer_ppi[ARCH_TIMER_MAX_TIMER_PPI];
static struct clock_event_device __percpu *arch_timer_evt;
arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, clk);
}
-static int erratum_set_next_event_tval_virt(unsigned long evt,
+static __maybe_unused int erratum_set_next_event_tval_virt(unsigned long evt,
struct clock_event_device *clk)
{
erratum_set_next_event_tval_generic(ARCH_TIMER_VIRT_ACCESS, evt, clk);
return 0;
}
-static int erratum_set_next_event_tval_phys(unsigned long evt,
+static __maybe_unused int erratum_set_next_event_tval_phys(unsigned long evt,
struct clock_event_device *clk)
{
erratum_set_next_event_tval_generic(ARCH_TIMER_PHYS_ACCESS, evt, clk);
return 0;
}
-static void
-arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np)
+/*
+ * For historical reasons, when probing with DT we use whichever (non-zero)
+ * rate was probed first, and don't verify that others match. If the first node
+ * probed has a clock-frequency property, this overrides the HW register.
+ */
+static void arch_timer_of_configure_rate(u32 rate, struct device_node *np)
{
/* Who has more than one independent system counter? */
if (arch_timer_rate)
return;
- /*
- * 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();
- }
+ if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate))
+ arch_timer_rate = rate;
/* Check the timer frequency. */
if (arch_timer_rate == 0)
case ARCH_TIMER_PHYS_NONSECURE_PPI:
err = request_percpu_irq(ppi, arch_timer_handler_phys,
"arch_timer", arch_timer_evt);
- if (!err && arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]) {
+ if (!err && arch_timer_has_nonsecure_ppi()) {
ppi = arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI];
err = request_percpu_irq(ppi, arch_timer_handler_phys,
"arch_timer", arch_timer_evt);
{},
};
-static bool __init
-arch_timer_needs_probing(int type, const struct of_device_id *matches)
+static bool __init arch_timer_needs_of_probing(void)
{
struct device_node *dn;
bool needs_probing = false;
+ unsigned int mask = ARCH_TIMER_TYPE_CP15 | ARCH_TIMER_TYPE_MEM;
+
+ /* We have two timers, and both device-tree nodes are probed. */
+ if ((arch_timers_present & mask) == mask)
+ return false;
+
+ /*
+ * Only one type of timer is probed,
+ * check if we have another type of timer node in device-tree.
+ */
+ if (arch_timers_present & ARCH_TIMER_TYPE_CP15)
+ dn = of_find_matching_node(NULL, arch_timer_mem_of_match);
+ else
+ dn = of_find_matching_node(NULL, arch_timer_of_match);
- dn = of_find_matching_node(NULL, matches);
- if (dn && of_device_is_available(dn) && !(arch_timers_present & type))
+ if (dn && of_device_is_available(dn))
needs_probing = true;
+
of_node_put(dn);
return needs_probing;
static int __init arch_timer_common_init(void)
{
- unsigned mask = ARCH_TIMER_TYPE_CP15 | ARCH_TIMER_TYPE_MEM;
-
- /* Wait until both nodes are probed if we have two timers */
- if ((arch_timers_present & mask) != mask) {
- if (arch_timer_needs_probing(ARCH_TIMER_TYPE_MEM,
- arch_timer_mem_of_match))
- return 0;
- if (arch_timer_needs_probing(ARCH_TIMER_TYPE_CP15,
- arch_timer_of_match))
- return 0;
- }
-
arch_timer_banner(arch_timers_present);
arch_counter_register(arch_timers_present);
return arch_timer_arch_init();
}
-static int __init arch_timer_init(void)
+/**
+ * arch_timer_select_ppi() - Select suitable PPI for the current system.
+ *
+ * If HYP mode is available, we know that the physical timer
+ * has been configured to be accessible from PL1. Use it, so
+ * that a guest can use the virtual timer instead.
+ *
+ * On ARMv8.1 with VH extensions, the kernel runs in HYP. VHE
+ * accesses to CNTP_*_EL1 registers are silently redirected to
+ * their CNTHP_*_EL2 counterparts, and use a different PPI
+ * number.
+ *
+ * If no interrupt provided for virtual timer, we'll have to
+ * stick to the physical timer. It'd better be accessible...
+ * For arm64 we never use the secure interrupt.
+ *
+ * Return: a suitable PPI type for the current system.
+ */
+static enum arch_timer_ppi_nr __init arch_timer_select_ppi(void)
{
- int ret;
- /*
- * If HYP mode is available, we know that the physical timer
- * has been configured to be accessible from PL1. Use it, so
- * that a guest can use the virtual timer instead.
- *
- * If no interrupt provided for virtual timer, we'll have to
- * stick to the physical timer. It'd better be accessible...
- *
- * On ARMv8.1 with VH extensions, the kernel runs in HYP. VHE
- * accesses to CNTP_*_EL1 registers are silently redirected to
- * their CNTHP_*_EL2 counterparts, and use a different PPI
- * number.
- */
- if (is_hyp_mode_available() || !arch_timer_ppi[ARCH_TIMER_VIRT_PPI]) {
- bool has_ppi;
+ if (is_kernel_in_hyp_mode())
+ return ARCH_TIMER_HYP_PPI;
- if (is_kernel_in_hyp_mode()) {
- arch_timer_uses_ppi = ARCH_TIMER_HYP_PPI;
- has_ppi = !!arch_timer_ppi[ARCH_TIMER_HYP_PPI];
- } else {
- arch_timer_uses_ppi = ARCH_TIMER_PHYS_SECURE_PPI;
- has_ppi = (!!arch_timer_ppi[ARCH_TIMER_PHYS_SECURE_PPI] ||
- !!arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI]);
- }
+ if (!is_hyp_mode_available() && arch_timer_ppi[ARCH_TIMER_VIRT_PPI])
+ return ARCH_TIMER_VIRT_PPI;
- if (!has_ppi) {
- pr_warn("No interrupt available, giving up\n");
- return -EINVAL;
- }
- }
+ if (IS_ENABLED(CONFIG_ARM64))
+ return ARCH_TIMER_PHYS_NONSECURE_PPI;
- ret = arch_timer_register();
- if (ret)
- return ret;
-
- ret = arch_timer_common_init();
- if (ret)
- return ret;
-
- arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
-
- return 0;
+ return ARCH_TIMER_PHYS_SECURE_PPI;
}
static int __init arch_timer_of_init(struct device_node *np)
{
- int i;
+ int i, ret;
+ u32 rate;
if (arch_timers_present & ARCH_TIMER_TYPE_CP15) {
pr_warn("multiple nodes in dt, skipping\n");
for (i = ARCH_TIMER_PHYS_SECURE_PPI; i < ARCH_TIMER_MAX_TIMER_PPI; i++)
arch_timer_ppi[i] = irq_of_parse_and_map(np, i);
- arch_timer_detect_rate(NULL, np);
+ arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
+
+ rate = arch_timer_get_cntfrq();
+ arch_timer_of_configure_rate(rate, np);
arch_timer_c3stop = !of_property_read_bool(np, "always-on");
if (IS_ENABLED(CONFIG_ARM) &&
of_property_read_bool(np, "arm,cpu-registers-not-fw-configured"))
arch_timer_uses_ppi = ARCH_TIMER_PHYS_SECURE_PPI;
+ else
+ arch_timer_uses_ppi = arch_timer_select_ppi();
+
+ if (!arch_timer_ppi[arch_timer_uses_ppi]) {
+ pr_err("No interrupt available, giving up\n");
+ return -EINVAL;
+ }
/* On some systems, the counter stops ticking when in suspend. */
arch_counter_suspend_stop = of_property_read_bool(np,
"arm,no-tick-in-suspend");
- return arch_timer_init();
+ ret = arch_timer_register();
+ if (ret)
+ return ret;
+
+ if (arch_timer_needs_of_probing())
+ return 0;
+
+ return arch_timer_common_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 int __init arch_timer_mem_init(struct device_node *np)
+static u32 __init
+arch_timer_mem_frame_get_cntfrq(struct arch_timer_mem_frame *frame)
{
- struct device_node *frame, *best_frame = NULL;
- void __iomem *cntctlbase, *base;
- unsigned int irq, ret = -EINVAL;
+ void __iomem *base;
+ u32 rate;
+
+ base = ioremap(frame->cntbase, frame->size);
+ if (!base) {
+ pr_err("Unable to map frame @ %pa\n", &frame->cntbase);
+ return 0;
+ }
+
+ rate = readl_relaxed(frame + CNTFRQ);
+
+ iounmap(frame);
+
+ return rate;
+}
+
+static struct arch_timer_mem_frame * __init
+arch_timer_mem_find_best_frame(struct arch_timer_mem *timer_mem)
+{
+ struct arch_timer_mem_frame *frame, *best_frame = NULL;
+ void __iomem *cntctlbase;
u32 cnttidr;
+ int i;
- arch_timers_present |= ARCH_TIMER_TYPE_MEM;
- cntctlbase = of_iomap(np, 0);
+ cntctlbase = ioremap(timer_mem->cntctlbase, timer_mem->size);
if (!cntctlbase) {
- pr_err("Can't find CNTCTLBase\n");
- return -ENXIO;
+ pr_err("Can't map CNTCTLBase @ %pa\n",
+ &timer_mem->cntctlbase);
+ return NULL;
}
cnttidr = readl_relaxed(cntctlbase + CNTTIDR);
* 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;
- u32 cntacr;
+ for (i = 0; i < ARCH_TIMER_MEM_MAX_FRAMES; i++) {
+ u32 cntacr = CNTACR_RFRQ | CNTACR_RWPT | CNTACR_RPCT |
+ CNTACR_RWVT | CNTACR_RVOFF | CNTACR_RVCT;
- if (of_property_read_u32(frame, "frame-number", &n)) {
- pr_err("Missing frame-number\n");
- of_node_put(frame);
- goto out;
- }
+ frame = &timer_mem->frame[i];
+ if (!frame->valid)
+ continue;
/* Try enabling everything, and see what sticks */
- cntacr = CNTACR_RFRQ | CNTACR_RWPT | CNTACR_RPCT |
- CNTACR_RWVT | CNTACR_RVOFF | CNTACR_RVCT;
- writel_relaxed(cntacr, cntctlbase + CNTACR(n));
- cntacr = readl_relaxed(cntctlbase + CNTACR(n));
+ writel_relaxed(cntacr, cntctlbase + CNTACR(i));
+ cntacr = readl_relaxed(cntctlbase + CNTACR(i));
- if ((cnttidr & CNTTIDR_VIRT(n)) &&
+ if ((cnttidr & CNTTIDR_VIRT(i)) &&
!(~cntacr & (CNTACR_RWVT | CNTACR_RVCT))) {
- of_node_put(best_frame);
best_frame = frame;
arch_timer_mem_use_virtual = true;
break;
if (~cntacr & (CNTACR_RWPT | CNTACR_RPCT))
continue;
- of_node_put(best_frame);
- best_frame = of_node_get(frame);
+ best_frame = frame;
}
- ret= -ENXIO;
- base = arch_counter_base = of_io_request_and_map(best_frame, 0,
- "arch_mem_timer");
- if (IS_ERR(base)) {
- pr_err("Can't map frame's registers\n");
- goto out;
- }
+ iounmap(cntctlbase);
+
+ if (!best_frame)
+ pr_err("Unable to find a suitable frame in timer @ %pa\n",
+ &timer_mem->cntctlbase);
+
+ return best_frame;
+}
+
+static int __init
+arch_timer_mem_frame_register(struct arch_timer_mem_frame *frame)
+{
+ void __iomem *base;
+ int ret, irq = 0;
if (arch_timer_mem_use_virtual)
- irq = irq_of_parse_and_map(best_frame, 1);
+ irq = frame->virt_irq;
else
- irq = irq_of_parse_and_map(best_frame, 0);
+ irq = frame->phys_irq;
- ret = -EINVAL;
if (!irq) {
pr_err("Frame missing %s irq.\n",
arch_timer_mem_use_virtual ? "virt" : "phys");
- goto out;
+ return -EINVAL;
+ }
+
+ if (!request_mem_region(frame->cntbase, frame->size,
+ "arch_mem_timer"))
+ return -EBUSY;
+
+ base = ioremap(frame->cntbase, frame->size);
+ if (!base) {
+ pr_err("Can't map frame's registers\n");
+ return -ENXIO;
}
- arch_timer_detect_rate(base, np);
ret = arch_timer_mem_register(base, irq);
- if (ret)
+ if (ret) {
+ iounmap(base);
+ return ret;
+ }
+
+ arch_counter_base = base;
+ arch_timers_present |= ARCH_TIMER_TYPE_MEM;
+
+ return 0;
+}
+
+static int __init arch_timer_mem_of_init(struct device_node *np)
+{
+ struct arch_timer_mem *timer_mem;
+ struct arch_timer_mem_frame *frame;
+ struct device_node *frame_node;
+ struct resource res;
+ int ret = -EINVAL;
+ u32 rate;
+
+ timer_mem = kzalloc(sizeof(*timer_mem), GFP_KERNEL);
+ if (!timer_mem)
+ return -ENOMEM;
+
+ if (of_address_to_resource(np, 0, &res))
goto out;
+ timer_mem->cntctlbase = res.start;
+ timer_mem->size = resource_size(&res);
- return arch_timer_common_init();
+ for_each_available_child_of_node(np, frame_node) {
+ u32 n;
+ struct arch_timer_mem_frame *frame;
+
+ if (of_property_read_u32(frame_node, "frame-number", &n)) {
+ pr_err(FW_BUG "Missing frame-number.\n");
+ of_node_put(frame_node);
+ goto out;
+ }
+ if (n >= ARCH_TIMER_MEM_MAX_FRAMES) {
+ pr_err(FW_BUG "Wrong frame-number, only 0-%u are permitted.\n",
+ ARCH_TIMER_MEM_MAX_FRAMES - 1);
+ of_node_put(frame_node);
+ goto out;
+ }
+ frame = &timer_mem->frame[n];
+
+ if (frame->valid) {
+ pr_err(FW_BUG "Duplicated frame-number.\n");
+ of_node_put(frame_node);
+ goto out;
+ }
+
+ if (of_address_to_resource(frame_node, 0, &res)) {
+ of_node_put(frame_node);
+ goto out;
+ }
+ frame->cntbase = res.start;
+ frame->size = resource_size(&res);
+
+ frame->virt_irq = irq_of_parse_and_map(frame_node,
+ ARCH_TIMER_VIRT_SPI);
+ frame->phys_irq = irq_of_parse_and_map(frame_node,
+ ARCH_TIMER_PHYS_SPI);
+
+ frame->valid = true;
+ }
+
+ frame = arch_timer_mem_find_best_frame(timer_mem);
+ if (!frame) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ rate = arch_timer_mem_frame_get_cntfrq(frame);
+ arch_timer_of_configure_rate(rate, np);
+
+ ret = arch_timer_mem_frame_register(frame);
+ if (!ret && !arch_timer_needs_of_probing())
+ ret = arch_timer_common_init();
out:
- iounmap(cntctlbase);
- of_node_put(best_frame);
+ kfree(timer_mem);
return ret;
}
CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem",
- arch_timer_mem_init);
+ arch_timer_mem_of_init);
-#ifdef CONFIG_ACPI
-static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags)
+#ifdef CONFIG_ACPI_GTDT
+static int __init
+arch_timer_mem_verify_cntfrq(struct arch_timer_mem *timer_mem)
{
- int trigger, polarity;
+ struct arch_timer_mem_frame *frame;
+ u32 rate;
+ int i;
- if (!interrupt)
- return 0;
+ for (i = 0; i < ARCH_TIMER_MEM_MAX_FRAMES; i++) {
+ frame = &timer_mem->frame[i];
- trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE
- : ACPI_LEVEL_SENSITIVE;
+ if (!frame->valid)
+ continue;
+
+ rate = arch_timer_mem_frame_get_cntfrq(frame);
+ if (rate == arch_timer_rate)
+ continue;
- polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW
- : ACPI_ACTIVE_HIGH;
+ pr_err(FW_BUG "CNTFRQ mismatch: frame @ %pa: (0x%08lx), CPU: (0x%08lx)\n",
+ &frame->cntbase,
+ (unsigned long)rate, (unsigned long)arch_timer_rate);
- return acpi_register_gsi(NULL, interrupt, trigger, polarity);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int __init arch_timer_mem_acpi_init(int platform_timer_count)
+{
+ struct arch_timer_mem *timers, *timer;
+ struct arch_timer_mem_frame *frame;
+ int timer_count, i, ret = 0;
+
+ timers = kcalloc(platform_timer_count, sizeof(*timers),
+ GFP_KERNEL);
+ if (!timers)
+ return -ENOMEM;
+
+ ret = acpi_arch_timer_mem_init(timers, &timer_count);
+ if (ret || !timer_count)
+ goto out;
+
+ for (i = 0; i < timer_count; i++) {
+ ret = arch_timer_mem_verify_cntfrq(&timers[i]);
+ if (ret) {
+ pr_err("Disabling MMIO timers due to CNTFRQ mismatch\n");
+ goto out;
+ }
+ }
+
+ /*
+ * While unlikely, it's theoretically possible that none of the frames
+ * in a timer expose the combination of feature we want.
+ */
+ for (i = i; i < timer_count; i++) {
+ timer = &timers[i];
+
+ frame = arch_timer_mem_find_best_frame(timer);
+ if (frame)
+ break;
+ }
+
+ if (frame)
+ ret = arch_timer_mem_frame_register(frame);
+out:
+ kfree(timers);
+ return ret;
}
-/* Initialize per-processor generic timer */
+/* Initialize per-processor generic timer and memory-mapped timer(if present) */
static int __init arch_timer_acpi_init(struct acpi_table_header *table)
{
- struct acpi_table_gtdt *gtdt;
+ int ret, platform_timer_count;
if (arch_timers_present & ARCH_TIMER_TYPE_CP15) {
pr_warn("already initialized, skipping\n");
return -EINVAL;
}
- gtdt = container_of(table, struct acpi_table_gtdt, header);
-
arch_timers_present |= ARCH_TIMER_TYPE_CP15;
- arch_timer_ppi[ARCH_TIMER_PHYS_SECURE_PPI] =
- map_generic_timer_interrupt(gtdt->secure_el1_interrupt,
- gtdt->secure_el1_flags);
+ ret = acpi_gtdt_init(table, &platform_timer_count);
+ if (ret) {
+ pr_err("Failed to init GTDT table.\n");
+ return ret;
+ }
arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI] =
- map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt,
- gtdt->non_secure_el1_flags);
+ acpi_gtdt_map_ppi(ARCH_TIMER_PHYS_NONSECURE_PPI);
arch_timer_ppi[ARCH_TIMER_VIRT_PPI] =
- map_generic_timer_interrupt(gtdt->virtual_timer_interrupt,
- gtdt->virtual_timer_flags);
+ acpi_gtdt_map_ppi(ARCH_TIMER_VIRT_PPI);
arch_timer_ppi[ARCH_TIMER_HYP_PPI] =
- map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt,
- gtdt->non_secure_el2_flags);
+ acpi_gtdt_map_ppi(ARCH_TIMER_HYP_PPI);
- /* Get the frequency from CNTFRQ */
- arch_timer_detect_rate(NULL, NULL);
+ arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
+
+ /*
+ * When probing via ACPI, we have no mechanism to override the sysreg
+ * CNTFRQ value. This *must* be correct.
+ */
+ arch_timer_rate = arch_timer_get_cntfrq();
+ if (!arch_timer_rate) {
+ pr_err(FW_BUG "frequency not available.\n");
+ return -EINVAL;
+ }
+
+ arch_timer_uses_ppi = arch_timer_select_ppi();
+ if (!arch_timer_ppi[arch_timer_uses_ppi]) {
+ pr_err("No interrupt available, giving up\n");
+ return -EINVAL;
+ }
/* Always-on capability */
- arch_timer_c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON);
+ arch_timer_c3stop = acpi_gtdt_c3stop(arch_timer_uses_ppi);
/* Check for globally applicable workarounds */
arch_timer_check_ool_workaround(ate_match_acpi_oem_info, table);
- arch_timer_init();
- return 0;
+ ret = arch_timer_register();
+ if (ret)
+ return ret;
+
+ if (platform_timer_count &&
+ arch_timer_mem_acpi_init(platform_timer_count))
+ pr_err("Failed to initialize memory-mapped timer.\n");
+
+ return arch_timer_common_init();
}
CLOCKSOURCE_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init);
#endif
git.samba.org / sfrench / cifs-2.6.git / blobdiff