@@ -13,6 +13,7 @@
#include <linux/acpi.h>
#include <linux/init.h>
+#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <clocksource/arm_arch_timer.h>
@@ -37,6 +38,28 @@ struct acpi_gtdt_descriptor {
static struct acpi_gtdt_descriptor acpi_gtdt_desc __initdata;
+static inline void *next_platform_timer(void *platform_timer)
+{
+ struct acpi_gtdt_header *gh = platform_timer;
+
+ platform_timer += gh->length;
+ if (platform_timer < acpi_gtdt_desc.gtdt_end)
+ return platform_timer;
+
+ return NULL;
+}
+
+#define for_each_platform_timer(_g) \
+ for (_g = acpi_gtdt_desc.platform_timer; _g; \
+ _g = next_platform_timer(_g))
+
+static inline bool is_timer_block(void *platform_timer)
+{
+ struct acpi_gtdt_header *gh = platform_timer;
+
+ return gh->type == ACPI_GTDT_TYPE_TIMER_BLOCK;
+}
+
static int __init map_gt_gsi(u32 interrupt, u32 flags)
{
int trigger, polarity;
@@ -155,3 +178,124 @@ int __init acpi_gtdt_init(struct acpi_table_header *table,
return 0;
}
+
+static int __init gtdt_parse_timer_block(struct acpi_gtdt_timer_block *block,
+ struct arch_timer_mem *timer_mem)
+{
+ int i;
+ struct arch_timer_mem_frame *frame;
+ struct acpi_gtdt_timer_entry *gtdt_frame;
+
+ if (!block->timer_count) {
+ pr_err(FW_BUG "GT block present, but frame count is zero.");
+ return -ENODEV;
+ }
+
+ if (block->timer_count > ARCH_TIMER_MEM_MAX_FRAMES) {
+ pr_err(FW_BUG "GT block lists %d frames, ACPI spec only allows 8\n",
+ block->timer_count);
+ return -EINVAL;
+ }
+
+ timer_mem->cntctlbase = (phys_addr_t)block->block_address;
+ /*
+ * The CNTCTLBase frame is 4KB (register offsets 0x000 - 0xFFC).
+ * See ARM DDI 0487A.k_iss10775, page I1-5129, Table I1-3
+ * "CNTCTLBase memory map".
+ */
+ timer_mem->size = SZ_4K;
+
+ gtdt_frame = (void *)block + block->timer_offset;
+ if (gtdt_frame + block->timer_count != (void *)block + block->header.length)
+ return -EINVAL;
+
+ /*
+ * Get the GT timer Frame data for every GT Block Timer
+ */
+ for (i = 0; i < block->timer_count; i++, gtdt_frame++) {
+ if (gtdt_frame->common_flags & ACPI_GTDT_GT_IS_SECURE_TIMER)
+ continue;
+
+ if (!gtdt_frame->base_address || !gtdt_frame->timer_interrupt)
+ goto error;
+
+ frame = &timer_mem->frame[gtdt_frame->frame_number];
+ frame->phys_irq = map_gt_gsi(gtdt_frame->timer_interrupt,
+ gtdt_frame->timer_flags);
+ if (frame->phys_irq <= 0) {
+ pr_warn("failed to map physical timer irq in frame %d.\n",
+ gtdt_frame->frame_number);
+ goto error;
+ }
+
+ if (gtdt_frame->virtual_timer_interrupt) {
+ frame->virt_irq =
+ map_gt_gsi(gtdt_frame->virtual_timer_interrupt,
+ gtdt_frame->virtual_timer_flags);
+ if (frame->virt_irq <= 0) {
+ pr_warn("failed to map virtual timer irq in frame %d.\n",
+ gtdt_frame->frame_number);
+ goto error;
+ }
+ } else {
+ frame->virt_irq = 0;
+ pr_debug("virtual timer in frame %d not implemented.\n",
+ gtdt_frame->frame_number);
+ }
+
+ frame->cntbase = gtdt_frame->base_address;
+ /*
+ * The CNTBaseN frame is 4KB (register offsets 0x000 - 0xFFC).
+ * See ARM DDI 0487A.k_iss10775, page I1-5130, Table I1-4
+ * "CNTBaseN memory map".
+ */
+ frame->size = SZ_4K;
+ frame->valid = true;
+ }
+
+ return 0;
+
+error:
+ for (i = 0; i < ARCH_TIMER_MEM_MAX_FRAMES; i++) {
+ frame = &timer_mem->frame[i];
+ if (frame->phys_irq > 0)
+ acpi_unregister_irq(frame->phys_irq);
+ if (frame->virt_irq > 0)
+ acpi_unregister_irq(frame->virt_irq);
+ }
+ return -EINVAL;
+}
+
+/**
+ * acpi_arch_timer_mem_init() - Get the info of all GT blocks in GTDT table.
+ * @timer_mem: The pointer to the array of struct arch_timer_mem for returning
+ * the result of parsing. The element number of this array should
+ * be platform_timer_count(the total number of platform timers).
+ * @timer_count: It points to a integer variable which is used for storing the
+ * number of GT blocks we have parsed.
+ *
+ * Return: 0 if success, -EINVAL/-ENODEV if error.
+ */
+int __init acpi_arch_timer_mem_init(struct arch_timer_mem *timer_mem,
+ int *timer_count)
+{
+ int ret;
+ void *platform_timer;
+
+ *timer_count = 0;
+ for_each_platform_timer(platform_timer) {
+ if (is_timer_block(platform_timer)) {
+ ret = gtdt_parse_timer_block(platform_timer, timer_mem);
+ if (ret)
+ return ret;
+ timer_mem++;
+ (*timer_count)++;
+ }
+ }
+
+ if (*timer_count)
+ pr_info("found %d memory-mapped timer block(s).\n",
+ *timer_count);
+
+ return 0;
+}
@@ -606,6 +606,7 @@ int acpi_reconfig_notifier_unregister(struct notifier_block *nb);
int acpi_gtdt_init(struct acpi_table_header *table, int *platform_timer_count);
int acpi_gtdt_map_ppi(int type);
bool acpi_gtdt_c3stop(int type);
+int acpi_arch_timer_mem_init(struct arch_timer_mem *timer_mem, int *timer_count);
#endif
#else /* !CONFIG_ACPI */