The PSS register reflects the power state of each island on SoC. It would be
useful to know which of the islands is on or off at the momemnt.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Acked-by: Aubrey Li <aubrey.li@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/pmc_atom.h | 22 +++++++++++++++
arch/x86/kernel/pmc_atom.c | 61 +++++++++++++++++++++++++++++++++++++++--
2 files changed, 80 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/pmc_atom.h b/arch/x86/include/asm/pmc_atom.h
index fc7a17c..bc0fc08 100644
--- a/arch/x86/include/asm/pmc_atom.h
+++ b/arch/x86/include/asm/pmc_atom.h
@@ -53,6 +53,28 @@
/* Sleep state counter is in units of of 32us */
#define PMC_TMR_SHIFT 5
+/* Power status of power islands */
+#define PMC_PSS 0x98
+
+#define PMC_PSS_BIT_GBE BIT(0)
+#define PMC_PSS_BIT_SATA BIT(1)
+#define PMC_PSS_BIT_HDA BIT(2)
+#define PMC_PSS_BIT_SEC BIT(3)
+#define PMC_PSS_BIT_PCIE BIT(4)
+#define PMC_PSS_BIT_LPSS BIT(5)
+#define PMC_PSS_BIT_LPE BIT(6)
+#define PMC_PSS_BIT_DFX BIT(7)
+#define PMC_PSS_BIT_USH_CTRL BIT(8)
+#define PMC_PSS_BIT_USH_SUS BIT(9)
+#define PMC_PSS_BIT_USH_VCCS BIT(10)
+#define PMC_PSS_BIT_USH_VCCA BIT(11)
+#define PMC_PSS_BIT_OTG_CTRL BIT(12)
+#define PMC_PSS_BIT_OTG_VCCS BIT(13)
+#define PMC_PSS_BIT_OTG_VCCA_CLK BIT(14)
+#define PMC_PSS_BIT_OTG_VCCA BIT(15)
+#define PMC_PSS_BIT_USB BIT(16)
+#define PMC_PSS_BIT_USB_SUS BIT(17)
+
/* These registers reflect D3 status of functions */
#define PMC_D3_STS_0 0xA0
diff --git a/arch/x86/kernel/pmc_atom.c b/arch/x86/kernel/pmc_atom.c
index f8becc4..d66a4fe 100644
--- a/arch/x86/kernel/pmc_atom.c
+++ b/arch/x86/kernel/pmc_atom.c
@@ -36,12 +36,12 @@ struct pmc_dev {
static struct pmc_dev pmc_device;
static u32 acpi_base_addr;
-struct pmc_dev_map {
+struct pmc_bit_map {
const char *name;
u32 bit_mask;
};
-static const struct pmc_dev_map dev_map[] = {
+static const struct pmc_bit_map dev_map[] = {
{"0 - LPSS1_F0_DMA", BIT_LPSS1_F0_DMA},
{"1 - LPSS1_F1_PWM1", BIT_LPSS1_F1_PWM1},
{"2 - LPSS1_F2_PWM2", BIT_LPSS1_F2_PWM2},
@@ -80,6 +80,27 @@ static const struct pmc_dev_map dev_map[] = {
{"35 - DFX", BIT_DFX},
};
+static const struct pmc_bit_map pss_map[] = {
+ {"0 - GBE", PMC_PSS_BIT_GBE},
+ {"1 - SATA", PMC_PSS_BIT_SATA},
+ {"2 - HDA", PMC_PSS_BIT_HDA},
+ {"3 - SEC", PMC_PSS_BIT_SEC},
+ {"4 - PCIE", PMC_PSS_BIT_PCIE},
+ {"5 - LPSS", PMC_PSS_BIT_LPSS},
+ {"6 - LPE", PMC_PSS_BIT_LPE},
+ {"7 - DFX", PMC_PSS_BIT_DFX},
+ {"8 - USH_CTRL", PMC_PSS_BIT_USH_CTRL},
+ {"9 - USH_SUS", PMC_PSS_BIT_USH_SUS},
+ {"10 - USH_VCCS", PMC_PSS_BIT_USH_VCCS},
+ {"11 - USH_VCCA", PMC_PSS_BIT_USH_VCCA},
+ {"12 - OTG_CTRL", PMC_PSS_BIT_OTG_CTRL},
+ {"13 - OTG_VCCS", PMC_PSS_BIT_OTG_VCCS},
+ {"14 - OTG_VCCA_CLK", PMC_PSS_BIT_OTG_VCCA_CLK},
+ {"15 - OTG_VCCA", PMC_PSS_BIT_OTG_VCCA},
+ {"16 - USB", PMC_PSS_BIT_USB},
+ {"17 - USB_SUS", PMC_PSS_BIT_USB_SUS},
+};
+
static inline u32 pmc_reg_read(struct pmc_dev *pmc, int reg_offset)
{
return readl(pmc->regmap + reg_offset);
@@ -167,6 +188,32 @@ static const struct file_operations pmc_dev_state_ops = {
.release = single_release,
};
+static int pmc_pss_state_show(struct seq_file *s, void *unused)
+{
+ struct pmc_dev *pmc = s->private;
+ u32 pss = pmc_reg_read(pmc, PMC_PSS);
+ int pss_index;
+
+ for (pss_index = 0; pss_index < ARRAY_SIZE(pss_map); pss_index++) {
+ seq_printf(s, "Island: %-32s\tState: %s\n",
+ pss_map[pss_index].name,
+ pss_map[pss_index].bit_mask & pss ? "Off" : "On");
+ }
+ return 0;
+}
+
+static int pmc_pss_state_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, pmc_pss_state_show, inode->i_private);
+}
+
+static const struct file_operations pmc_pss_state_ops = {
+ .open = pmc_pss_state_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
static int pmc_sleep_tmr_show(struct seq_file *s, void *unused)
{
struct pmc_dev *pmc = s->private;
@@ -216,9 +263,17 @@ static int pmc_dbgfs_register(struct pmc_dev *pmc, struct pci_dev *pdev)
f = debugfs_create_file("dev_state", S_IFREG | S_IRUGO,
dir, pmc, &pmc_dev_state_ops);
if (!f) {
- dev_err(&pdev->dev, "dev_states register failed\n");
+ dev_err(&pdev->dev, "dev_state register failed\n");
goto err;
}
+
+ f = debugfs_create_file("pss_state", S_IFREG | S_IRUGO,
+ dir, pmc, &pmc_pss_state_ops);
+ if (!f) {
+ dev_err(&pdev->dev, "pss_state register failed\n");
+ goto err;
+ }
+
f = debugfs_create_file("sleep_state", S_IFREG | S_IRUGO,
dir, pmc, &pmc_sleep_tmr_ops);
if (!f) {
--
2.1.4
--
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