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x86: pmc_atom: Expose contents of PSS

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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@linux.intel.com>
Acked-by: Aubrey Li <aubrey.li@linux.intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Kumar P. Mahesh <mahesh.kumar.p@intel.com>
Link: http://lkml.kernel.org/r/1421253575-22509-6-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andy Shevchenko 2015-01-14 18:39:35 +02:00 committed by Thomas Gleixner
parent 4b25f42a37
commit 0e1540208e
2 changed files with 80 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
arch/x86/include/asm/pmc_atom.h
View File

@ -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

61
arch/x86/kernel/pmc_atom.c
View File

@ -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) {