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Commit f855911c authored by Li, Aubrey's avatar Li, Aubrey Committed by H. Peter Anvin
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x86/pmc_atom: Expose PMC device state and platform sleep state 



Add the following interfaces to exposes PMC device state and sleep
state residency via debugfs:
	/sys/kernel/debugfs/pmc_atom/dev_state
	/sys/kernel/debugfs/pmc_atom/sleep_state

Signed-off-by: default avatarAubrey Li <aubrey.li@linux.intel.com>
Link: http://lkml.kernel.org/r/53B0FF59.8000600@linux.intel.com


Signed-off-by: default avatarKasagar, Srinidhi <srinidhi.kasagar@intel.com>
Reviewed-by: default avatarRudramuni, Vishwesh M <vishwesh.m.rudramuni@intel.com>
Reviewed-by: default avatarJoe Perches <joe@perches.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent b00055ca

arch/x86/include/asm/pmc_atom.h

+55 −0
Original line number Diff line number Diff line
@@ -25,6 +25,10 @@ 
#define	PMC_MMIO_REG_LEN	0x100

#define	PMC_REG_BIT_WIDTH	32



/* BIOS uses FUNC_DIS to disable specific function */

#define	PMC_FUNC_DIS		0x34

#define	PMC_FUNC_DIS_2		0x38



/* S0ix wake event control */

#define	PMC_S0IX_WAKE_EN	0x3C
@@ -40,6 +44,57 @@ 
				BIT_ORED_DEDICATED_IRQ_GPSC | \

				BIT_SHARED_IRQ_GPSS)



/* The timers acumulate time spent in sleep state */

#define	PMC_S0IR_TMR		0x80

#define	PMC_S0I1_TMR		0x84

#define	PMC_S0I2_TMR		0x88

#define	PMC_S0I3_TMR		0x8C

#define	PMC_S0_TMR		0x90

/* Sleep state counter is in units of of 32us */

#define	PMC_TMR_SHIFT		5



/* These registers reflect D3 status of functions */

#define	PMC_D3_STS_0		0xA0



#define	BIT_LPSS1_F0_DMA	BIT(0)

#define	BIT_LPSS1_F1_PWM1	BIT(1)

#define	BIT_LPSS1_F2_PWM2	BIT(2)

#define	BIT_LPSS1_F3_HSUART1	BIT(3)

#define	BIT_LPSS1_F4_HSUART2	BIT(4)

#define	BIT_LPSS1_F5_SPI	BIT(5)

#define	BIT_LPSS1_F6_XXX	BIT(6)

#define	BIT_LPSS1_F7_XXX	BIT(7)

#define	BIT_SCC_EMMC		BIT(8)

#define	BIT_SCC_SDIO		BIT(9)

#define	BIT_SCC_SDCARD		BIT(10)

#define	BIT_SCC_MIPI		BIT(11)

#define	BIT_HDA			BIT(12)

#define	BIT_LPE			BIT(13)

#define	BIT_OTG			BIT(14)

#define	BIT_USH			BIT(15)

#define	BIT_GBE			BIT(16)

#define	BIT_SATA		BIT(17)

#define	BIT_USB_EHCI		BIT(18)

#define	BIT_SEC			BIT(19)

#define	BIT_PCIE_PORT0		BIT(20)

#define	BIT_PCIE_PORT1		BIT(21)

#define	BIT_PCIE_PORT2		BIT(22)

#define	BIT_PCIE_PORT3		BIT(23)

#define	BIT_LPSS2_F0_DMA	BIT(24)

#define	BIT_LPSS2_F1_I2C1	BIT(25)

#define	BIT_LPSS2_F2_I2C2	BIT(26)

#define	BIT_LPSS2_F3_I2C3	BIT(27)

#define	BIT_LPSS2_F4_I2C4	BIT(28)

#define	BIT_LPSS2_F5_I2C5	BIT(29)

#define	BIT_LPSS2_F6_I2C6	BIT(30)

#define	BIT_LPSS2_F7_I2C7	BIT(31)



#define	PMC_D3_STS_1		0xA4

#define	BIT_SMB			BIT(0)

#define	BIT_OTG_SS_PHY		BIT(1)

#define	BIT_USH_SS_PHY		BIT(2)

#define	BIT_DFX			BIT(3)



/* PMC I/O Registers */

#define	ACPI_BASE_ADDR_OFFSET	0x40

#define	ACPI_BASE_ADDR_MASK	0xFFFFFE00

arch/x86/kernel/pmc_atom.c

+175 −0
Original line number Diff line number Diff line
@@ -19,18 +19,69 @@ 
#include <linux/init.h>

#include <linux/pci.h>

#include <linux/device.h>

#include <linux/debugfs.h>

#include <linux/seq_file.h>

#include <linux/io.h>



#include <asm/pmc_atom.h>



#define	DRIVER_NAME	KBUILD_MODNAME



struct pmc_dev {

	u32 base_addr;

	void __iomem *regmap;

#ifdef CONFIG_DEBUG_FS

	struct dentry *dbgfs_dir;

#endif /* CONFIG_DEBUG_FS */

};



static struct pmc_dev pmc_device;

static u32 acpi_base_addr;



struct pmc_dev_map {

	const char *name;

	u32 bit_mask;

};



static const struct pmc_dev_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},

	{"3  - LPSS1_F3_HSUART1",	BIT_LPSS1_F3_HSUART1},

	{"4  - LPSS1_F4_HSUART2",	BIT_LPSS1_F4_HSUART2},

	{"5  - LPSS1_F5_SPI",		BIT_LPSS1_F5_SPI},

	{"6  - LPSS1_F6_Reserved",	BIT_LPSS1_F6_XXX},

	{"7  - LPSS1_F7_Reserved",	BIT_LPSS1_F7_XXX},

	{"8  - SCC_EMMC",		BIT_SCC_EMMC},

	{"9  - SCC_SDIO",		BIT_SCC_SDIO},

	{"10 - SCC_SDCARD",		BIT_SCC_SDCARD},

	{"11 - SCC_MIPI",		BIT_SCC_MIPI},

	{"12 - HDA",			BIT_HDA},

	{"13 - LPE",			BIT_LPE},

	{"14 - OTG",			BIT_OTG},

	{"15 - USH",			BIT_USH},

	{"16 - GBE",			BIT_GBE},

	{"17 - SATA",			BIT_SATA},

	{"18 - USB_EHCI",		BIT_USB_EHCI},

	{"19 - SEC",			BIT_SEC},

	{"20 - PCIE_PORT0",		BIT_PCIE_PORT0},

	{"21 - PCIE_PORT1",		BIT_PCIE_PORT1},

	{"22 - PCIE_PORT2",		BIT_PCIE_PORT2},

	{"23 - PCIE_PORT3",		BIT_PCIE_PORT3},

	{"24 - LPSS2_F0_DMA",		BIT_LPSS2_F0_DMA},

	{"25 - LPSS2_F1_I2C1",		BIT_LPSS2_F1_I2C1},

	{"26 - LPSS2_F2_I2C2",		BIT_LPSS2_F2_I2C2},

	{"27 - LPSS2_F3_I2C3",		BIT_LPSS2_F3_I2C3},

	{"28 - LPSS2_F3_I2C4",		BIT_LPSS2_F4_I2C4},

	{"29 - LPSS2_F5_I2C5",		BIT_LPSS2_F5_I2C5},

	{"30 - LPSS2_F6_I2C6",		BIT_LPSS2_F6_I2C6},

	{"31 - LPSS2_F7_I2C7",		BIT_LPSS2_F7_I2C7},

	{"32 - SMB",			BIT_SMB},

	{"33 - OTG_SS_PHY",		BIT_OTG_SS_PHY},

	{"34 - USH_SS_PHY",		BIT_USH_SS_PHY},

	{"35 - DFX",			BIT_DFX},

};



static inline u32 pmc_reg_read(struct pmc_dev *pmc, int reg_offset)

{

	return readl(pmc->regmap + reg_offset);
@@ -71,9 +122,125 @@ static void pmc_hw_reg_setup(struct pmc_dev *pmc) 
	pmc_reg_write(pmc, PMC_S0IX_WAKE_EN, (u32)PMC_WAKE_EN_SETTING);

}



#ifdef CONFIG_DEBUG_FS

static int pmc_dev_state_show(struct seq_file *s, void *unused)

{

	struct pmc_dev *pmc = s->private;

	u32 func_dis, func_dis_2, func_dis_index;

	u32 d3_sts_0, d3_sts_1, d3_sts_index;

	int dev_num, dev_index, reg_index;



	func_dis = pmc_reg_read(pmc, PMC_FUNC_DIS);

	func_dis_2 = pmc_reg_read(pmc, PMC_FUNC_DIS_2);

	d3_sts_0 = pmc_reg_read(pmc, PMC_D3_STS_0);

	d3_sts_1 = pmc_reg_read(pmc, PMC_D3_STS_1);



	dev_num = ARRAY_SIZE(dev_map);



	for (dev_index = 0; dev_index < dev_num; dev_index++) {

		reg_index = dev_index / PMC_REG_BIT_WIDTH;

		if (reg_index) {

			func_dis_index = func_dis_2;

			d3_sts_index = d3_sts_1;

		} else {

			func_dis_index = func_dis;

			d3_sts_index = d3_sts_0;

		}



		seq_printf(s, "Dev: %-32s\tState: %s [%s]\n",

			dev_map[dev_index].name,

			dev_map[dev_index].bit_mask & func_dis_index ?

			"Disabled" : "Enabled ",

			dev_map[dev_index].bit_mask & d3_sts_index ?

			"D3" : "D0");

	}

	return 0;

}



static int pmc_dev_state_open(struct inode *inode, struct file *file)

{

	return single_open(file, pmc_dev_state_show, inode->i_private);

}



static const struct file_operations pmc_dev_state_ops = {

	.open		= pmc_dev_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;

	u64 s0ir_tmr, s0i1_tmr, s0i2_tmr, s0i3_tmr, s0_tmr;



	s0ir_tmr = pmc_reg_read(pmc, PMC_S0IR_TMR) << PMC_TMR_SHIFT;

	s0i1_tmr = pmc_reg_read(pmc, PMC_S0I1_TMR) << PMC_TMR_SHIFT;

	s0i2_tmr = pmc_reg_read(pmc, PMC_S0I2_TMR) << PMC_TMR_SHIFT;

	s0i3_tmr = pmc_reg_read(pmc, PMC_S0I3_TMR) << PMC_TMR_SHIFT;

	s0_tmr = pmc_reg_read(pmc, PMC_S0_TMR) << PMC_TMR_SHIFT;



	seq_printf(s, "S0IR Residency:\t%lldus\n", s0ir_tmr);

	seq_printf(s, "S0I1 Residency:\t%lldus\n", s0i1_tmr);

	seq_printf(s, "S0I2 Residency:\t%lldus\n", s0i2_tmr);

	seq_printf(s, "S0I3 Residency:\t%lldus\n", s0i3_tmr);

	seq_printf(s, "S0   Residency:\t%lldus\n", s0_tmr);

	return 0;

}



static int pmc_sleep_tmr_open(struct inode *inode, struct file *file)

{

	return single_open(file, pmc_sleep_tmr_show, inode->i_private);

}



static const struct file_operations pmc_sleep_tmr_ops = {

	.open		= pmc_sleep_tmr_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static void pmc_dbgfs_unregister(struct pmc_dev *pmc)

{

	if (!pmc->dbgfs_dir)

		return;



	debugfs_remove_recursive(pmc->dbgfs_dir);

	pmc->dbgfs_dir = NULL;

}



static int pmc_dbgfs_register(struct pmc_dev *pmc, struct pci_dev *pdev)

{

	struct dentry *dir, *f;



	dir = debugfs_create_dir("pmc_atom", NULL);

	if (!dir)

		return -ENOMEM;



	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");

		goto err;

	}

	f = debugfs_create_file("sleep_state", S_IFREG | S_IRUGO,

				dir, pmc, &pmc_sleep_tmr_ops);

	if (!f) {

		dev_err(&pdev->dev, "sleep_state register failed\n");

		goto err;

	}

	pmc->dbgfs_dir = dir;

	return 0;

err:

	pmc_dbgfs_unregister(pmc);

	return -ENODEV;

}

#endif /* CONFIG_DEBUG_FS */



static int pmc_setup_dev(struct pci_dev *pdev)

{

	struct pmc_dev *pmc = &pmc_device;

	int ret;



	/* Obtain ACPI base address */

	pci_read_config_dword(pdev, ACPI_BASE_ADDR_OFFSET, &acpi_base_addr);
@@ -94,6 +261,14 @@ static int pmc_setup_dev(struct pci_dev *pdev) 


	/* PMC hardware registers setup */

	pmc_hw_reg_setup(pmc);



#ifdef CONFIG_DEBUG_FS

	ret = pmc_dbgfs_register(pmc, pdev);

	if (ret) {

		iounmap(pmc->regmap);

		return ret;

	}

#endif /* CONFIG_DEBUG_FS */

	return 0;

}