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Diffstat (limited to 'drivers/platform/x86')
-rw-r--r--drivers/platform/x86/intel_pmc_ipc.c64
1 files changed, 58 insertions, 6 deletions
diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c
index 59a86121105b..9dae8434bd78 100644
--- a/drivers/platform/x86/intel_pmc_ipc.c
+++ b/drivers/platform/x86/intel_pmc_ipc.c
@@ -32,7 +32,10 @@
#include <linux/notifier.h>
#include <linux/suspend.h>
#include <linux/acpi.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+
#include <asm/intel_pmc_ipc.h>
+
#include <linux/platform_data/itco_wdt.h>
/*
@@ -54,6 +57,18 @@
#define IPC_WRITE_BUFFER 0x80
#define IPC_READ_BUFFER 0x90
+/* PMC Global Control Registers */
+#define GCR_TELEM_DEEP_S0IX_OFFSET 0x1078
+#define GCR_TELEM_SHLW_S0IX_OFFSET 0x1080
+
+/* Residency with clock rate at 19.2MHz to usecs */
+#define S0IX_RESIDENCY_IN_USECS(d, s) \
+({ \
+ u64 result = 10ull * ((d) + (s)); \
+ do_div(result, 192); \
+ result; \
+})
+
/*
* 16-byte buffer for sending data associated with IPC command.
*/
@@ -68,7 +83,7 @@
#define PLAT_RESOURCE_IPC_INDEX 0
#define PLAT_RESOURCE_IPC_SIZE 0x1000
#define PLAT_RESOURCE_GCR_OFFSET 0x1008
-#define PLAT_RESOURCE_GCR_SIZE 0x4
+#define PLAT_RESOURCE_GCR_SIZE 0x1000
#define PLAT_RESOURCE_BIOS_DATA_INDEX 1
#define PLAT_RESOURCE_BIOS_IFACE_INDEX 2
#define PLAT_RESOURCE_TELEM_SSRAM_INDEX 3
@@ -113,6 +128,7 @@ static struct intel_pmc_ipc_dev {
/* gcr */
resource_size_t gcr_base;
int gcr_size;
+ bool has_gcr_regs;
/* punit */
struct platform_device *punit_dev;
@@ -178,6 +194,11 @@ static inline u32 ipc_data_readl(u32 offset)
return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
}
+static inline u64 gcr_data_readq(u32 offset)
+{
+ return readq(ipcdev.ipc_base + offset);
+}
+
static int intel_pmc_ipc_check_status(void)
{
int status;
@@ -710,7 +731,8 @@ static int ipc_plat_get_res(struct platform_device *pdev)
dev_err(&pdev->dev, "Failed to get ipc resource\n");
return -ENXIO;
}
- size = PLAT_RESOURCE_IPC_SIZE;
+ size = PLAT_RESOURCE_IPC_SIZE + PLAT_RESOURCE_GCR_SIZE;
+
if (!request_mem_region(res->start, size, pdev->name)) {
dev_err(&pdev->dev, "Failed to request ipc resource\n");
return -EBUSY;
@@ -746,6 +768,28 @@ static int ipc_plat_get_res(struct platform_device *pdev)
return 0;
}
+/**
+ * intel_pmc_s0ix_counter_read() - Read S0ix residency.
+ * @data: Out param that contains current S0ix residency count.
+ *
+ * Return: an error code or 0 on success.
+ */
+int intel_pmc_s0ix_counter_read(u64 *data)
+{
+ u64 deep, shlw;
+
+ if (!ipcdev.has_gcr_regs)
+ return -EACCES;
+
+ deep = gcr_data_readq(GCR_TELEM_DEEP_S0IX_OFFSET);
+ shlw = gcr_data_readq(GCR_TELEM_SHLW_S0IX_OFFSET);
+
+ *data = S0IX_RESIDENCY_IN_USECS(deep, shlw);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(intel_pmc_s0ix_counter_read);
+
#ifdef CONFIG_ACPI
static const struct acpi_device_id ipc_acpi_ids[] = {
{ "INT34D2", 0},
@@ -795,6 +839,8 @@ static int ipc_plat_probe(struct platform_device *pdev)
goto err_sys;
}
+ ipcdev.has_gcr_regs = true;
+
return 0;
err_sys:
free_irq(ipcdev.irq, &ipcdev);
@@ -806,8 +852,11 @@ err_device:
iounmap(ipcdev.ipc_base);
res = platform_get_resource(pdev, IORESOURCE_MEM,
PLAT_RESOURCE_IPC_INDEX);
- if (res)
- release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
+ if (res) {
+ release_mem_region(res->start,
+ PLAT_RESOURCE_IPC_SIZE +
+ PLAT_RESOURCE_GCR_SIZE);
+ }
return ret;
}
@@ -823,8 +872,11 @@ static int ipc_plat_remove(struct platform_device *pdev)
iounmap(ipcdev.ipc_base);
res = platform_get_resource(pdev, IORESOURCE_MEM,
PLAT_RESOURCE_IPC_INDEX);
- if (res)
- release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
+ if (res) {
+ release_mem_region(res->start,
+ PLAT_RESOURCE_IPC_SIZE +
+ PLAT_RESOURCE_GCR_SIZE);
+ }
ipcdev.dev = NULL;
return 0;
}