// SPDX-License-Identifier: GPL-2.0-only
/*
* ACPI support for Intel Lynxpoint LPSS.
*
* Copyright (C) 2013, Intel Corporation
* Authors: Mika Westerberg <[email protected]>
* Rafael J. Wysocki <[email protected]>
*/
#include <linux/acpi.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/platform_data/x86/clk-lpss.h>
#include <linux/platform_data/x86/pmc_atom.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/pwm.h>
#include <linux/pxa2xx_ssp.h>
#include <linux/suspend.h>
#include <linux/delay.h>
#include "../internal.h"
#ifdef CONFIG_X86_INTEL_LPSS
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/iosf_mbi.h>
#define LPSS_ADDR(desc) ((unsigned long)&desc)
#define LPSS_CLK_SIZE 0x04
#define LPSS_LTR_SIZE 0x18
/* Offsets relative to LPSS_PRIVATE_OFFSET */
#define LPSS_CLK_DIVIDER_DEF_MASK (BIT(1) | BIT(16))
#define LPSS_RESETS 0x04
#define LPSS_RESETS_RESET_FUNC BIT(0)
#define LPSS_RESETS_RESET_APB BIT(1)
#define LPSS_GENERAL 0x08
#define LPSS_GENERAL_LTR_MODE_SW BIT(2)
#define LPSS_GENERAL_UART_RTS_OVRD BIT(3)
#define LPSS_SW_LTR 0x10
#define LPSS_AUTO_LTR 0x14
#define LPSS_LTR_SNOOP_REQ BIT(15)
#define LPSS_LTR_SNOOP_MASK 0x0000FFFF
#define LPSS_LTR_SNOOP_LAT_1US 0x800
#define LPSS_LTR_SNOOP_LAT_32US 0xC00
#define LPSS_LTR_SNOOP_LAT_SHIFT 5
#define LPSS_LTR_SNOOP_LAT_CUTOFF 3000
#define LPSS_LTR_MAX_VAL 0x3FF
#define LPSS_TX_INT 0x20
#define LPSS_TX_INT_MASK BIT(1)
#define LPSS_PRV_REG_COUNT 9
/* LPSS Flags */
#define LPSS_CLK BIT(0)
#define LPSS_CLK_GATE BIT(1)
#define LPSS_CLK_DIVIDER BIT(2)
#define LPSS_LTR BIT(3)
#define LPSS_SAVE_CTX BIT(4)
/*
* For some devices the DSDT AML code for another device turns off the device
* before our suspend handler runs, causing us to read/save all 1-s (0xffffffff)
* as ctx register values.
* Luckily these devices always use the same ctx register values, so we can
* work around this by saving the ctx registers once on activation.
*/
#define LPSS_SAVE_CTX_ONCE BIT(5)
#define LPSS_NO_D3_DELAY BIT(6)
struct lpss_private_data;
struct lpss_device_desc {
unsigned int flags;
const char *clk_con_id;
unsigned int prv_offset;
size_t prv_size_override;
const struct property_entry *properties;
void (*setup)(struct lpss_private_data *pdata);
bool resume_from_noirq;
};
static const struct lpss_device_desc lpss_dma_desc = {
.flags = LPSS_CLK,
};
struct lpss_private_data {
struct acpi_device *adev;
void __iomem *mmio_base;
resource_size_t mmio_size;
unsigned int fixed_clk_rate;
struct clk *clk;
const struct lpss_device_desc *dev_desc;
u32 prv_reg_ctx[LPSS_PRV_REG_COUNT];
};
/* Devices which need to be in D3 before lpss_iosf_enter_d3_state() proceeds */
static u32 pmc_atom_d3_mask = 0xfe000ffe;
/* LPSS run time quirks */
static unsigned int lpss_quirks;
/*
* LPSS_QUIRK_ALWAYS_POWER_ON: override power state for LPSS DMA device.
*
* The LPSS DMA controller has neither _PS0 nor _PS3 method. Moreover
* it can be powered off automatically whenever the last LPSS device goes down.
* In case of no power any access to the DMA controller will hang the system.
* The behaviour is reproduced on some HP laptops based on Intel BayTrail as
* well as on ASuS T100TA transformer.
*
* This quirk overrides power state of entire LPSS island to keep DMA powered
* on whenever we have at least one other device in use.
*/
#define LPSS_QUIRK_ALWAYS_POWER_ON BIT(0)
/* UART Component Parameter Register */
#define LPSS_UART_CPR 0xF4
#define LPSS_UART_CPR_AFCE BIT(4)
static void lpss_uart_setup(struct lpss_private_data *pdata)
{
unsigned int offset;
u32 val;
offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
val = readl(pdata->mmio_base + offset);
writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);
val = readl(pdata->mmio_base + LPSS_UART_CPR);
if (!(val & LPSS_UART_CPR_AFCE)) {
offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;
val = readl(pdata->mmio_base + offset);
val |= LPSS_GENERAL_UART_RTS_OVRD;
writel(val, pdata->mmio_base + offset);
}
}
static void lpss_deassert_reset(struct lpss_private_data *pdata)
{
unsigned int offset;
u32 val;
offset = pdata->dev_desc->prv_offset + LPSS_RESETS;
val = readl(pdata->mmio_base + offset);
val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;
writel(val, pdata->mmio_base + offset);
}
/*
* BYT PWM used for backlight control by the i915 driver on systems without
* the Crystal Cove PMIC.
*/
static struct pwm_lookup byt_pwm_lookup[] = {
PWM_LOOKUP_WITH_MODULE("80860F09:00", 0, "0000:00:02.0",
"pwm_soc_backlight", 0, PWM_POLARITY_NORMAL,
"pwm-lpss-platform"),
};
static void byt_pwm_setup(struct lpss_private_data *pdata)
{
/* Only call pwm_add_table for the first PWM controller */
if (acpi_dev_uid_match(pdata->adev, 1))
pwm_add_table(byt_pwm_lookup, ARRAY_SIZE(byt_pwm_lookup));
}
#define LPSS_I2C_ENABLE 0x6c
static void byt_i2c_setup(struct lpss_private_data *pdata)
{
acpi_handle handle = pdata->adev->handle;
unsigned long long shared_host = 0;
acpi_status status;
u64 uid;
/* Expected to always be successfull, but better safe then sorry */
if (!acpi_dev_uid_to_integer(pdata->adev, &uid) && uid) {
/* Detect I2C bus shared with PUNIT and ignore its d3 status */
status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
if (ACPI_SUCCESS(status) && shared_host)
pmc_atom_d3_mask &= ~(BIT_LPSS2_F1_I2C1 << (uid - 1));
}
lpss_deassert_reset(pdata);
if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))
pdata->fixed_clk_rate = 133000000;
writel(0, pdata->mmio_base + LPSS_I2C_ENABLE);
}
/*
* BSW PWM1 is used for backlight control by the i915 driver
* BSW PWM2 is used for backlight control for fixed (etched into the glass)
* touch controls on some models. These touch-controls have specialized
* drivers which know they need the "pwm_soc_lpss_2" con-id.
*/
static struct pwm_lookup bsw_pwm_lookup[] = {
PWM_LOOKUP_WITH_MODULE("80862288:00", 0, "0000:00:02.0",
"pwm_soc_backlight", 0, PWM_POLARITY_NORMAL,
"pwm-lpss-platform"),
PWM_LOOKUP_WITH_MODULE("80862289:00", 0, NULL,
"pwm_soc_lpss_2", 0, PWM_POLARITY_NORMAL,
"pwm-lpss-platform"),
};
static void bsw_pwm_setup(struct lpss_private_data *pdata)
{
/* Only call pwm_add_table for the first PWM controller */
if (acpi_dev_uid_match(pdata->adev, 1))
pwm_add_table(bsw_pwm_lookup, ARRAY_SIZE(bsw_pwm_lookup));
}
static const struct property_entry lpt_spi_properties[] = {
PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_LPT_SSP),
{ }
};
static const struct lpss_device_desc lpt_spi_dev_desc = {
.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR
| LPSS_SAVE_CTX,
.prv_offset = 0x800,
.properties = lpt_spi_properties,
};
static const struct lpss_device_desc lpt_i2c_dev_desc = {
.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR | LPSS_SAVE_CTX,
.prv_offset = 0x800,
};
static struct property_entry uart_properties[] = {
PROPERTY_ENTRY_U32("reg-io-width", 4),
PROPERTY_ENTRY_U32("reg-shift", 2),
PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
{ },
};
static const struct lpss_device_desc lpt_uart_dev_desc = {
.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR
| LPSS_SAVE_CTX,
.clk_con_id = "baudclk",
.prv_offset = 0x800,
.setup = lpss_uart_setup,
.properties = uart_properties,
};
static const struct lpss_device_desc lpt_sdio_dev_desc = {
.flags = LPSS_LTR,
.prv_offset = 0x1000,
.prv_size_override = 0x1018,
};
static const struct lpss_device_desc byt_pwm_dev_desc = {
.flags = LPSS_SAVE_CTX,
.prv_offset = 0x800,
.setup = byt_pwm_setup,
};
static const struct lpss_device_desc bsw_pwm_dev_desc = {
.flags = LPSS_SAVE_CTX_ONCE | LPSS_NO_D3_DELAY,
.prv_offset = 0x800,
.setup = bsw_pwm_setup,
.resume_from_noirq = true,
};
static const struct lpss_device_desc bsw_pwm2_dev_desc = {
.flags = LPSS_SAVE_CTX_ONCE | LPSS_NO_D3_DELAY,
.prv_offset = 0x800,
.resume_from_noirq = true,
};
static const struct lpss_device_desc byt_uart_dev_desc = {
.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
.clk_con_id = "baudclk",
.prv_offset = 0x800,
.setup = lpss_uart_setup,
.properties = uart_properties,
};
static const struct lpss_device_desc bsw_uart_dev_desc = {
.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
| LPSS_NO_D3_DELAY,
.clk_con_id = "baudclk",
.prv_offset = 0x800,
.setup = lpss_uart_setup,
.properties = uart_properties,
};
static const struct property_entry byt_spi_properties[] = {
PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_BYT_SSP),
{ }
};
static const struct lpss_device_desc byt_spi_dev_desc = {
.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
.prv_offset = 0x400,
.properties = byt_spi_properties,
};
static const struct lpss_device_desc byt_sdio_dev_desc = {
.flags = LPSS_CLK,
};
static const struct lpss_device_desc byt_i2c_dev_desc = {
.flags = LPSS_CLK | LPSS_SAVE_CTX,
.prv_offset = 0x800,
.setup = byt_i2c_setup,
.resume_from_noirq = true,
};
static const struct lpss_device_desc bsw_i2c_dev_desc = {
.flags = LPSS_CLK | LPSS_SAVE_CTX | LPSS_NO_D3_DELAY,
.prv_offset = 0x800,
.setup = byt_i2c_setup,
.resume_from_noirq = true,
};
static const struct property_entry bsw_spi_properties[] = {
PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_BSW_SSP),
PROPERTY_ENTRY_U32("num-cs", 2),
{ }
};
static const struct lpss_device_desc bsw_spi_dev_desc = {
.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
| LPSS_NO_D3_DELAY,
.prv_offset = 0x400,
.setup = lpss_deassert_reset,
.properties = bsw_spi_properties,
};
static const struct x86_cpu_id lpss_cpu_ids[] = {
X86_MATCH_VFM(INTEL_ATOM_SILVERMONT, NULL),
X86_MATCH_VFM(INTEL_ATOM_AIRMONT, NULL),
{}
};
#else
#define LPSS_ADDR(desc) (0UL)
#endif /* CONFIG_X86_INTEL_LPSS */
static const struct acpi_device_id acpi_lpss_device_ids[] = {
/* Generic LPSS devices */
{ "INTL9C60", LPSS_ADDR(lpss_dma_desc) },
/* Lynxpoint LPSS devices */
{ "INT33C0", LPSS_ADDR(lpt_spi_dev_desc) },
{ "INT33C1", LPSS_ADDR(lpt_spi_dev_desc) },
{ "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc) },
{ "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc) },
{ "INT33C4", LPSS_ADDR(lpt_uart_dev_desc) },
{ "INT33C5", LPSS_ADDR(lpt_uart_dev_desc) },
{ "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc) },
/* BayTrail LPSS devices */
{ "80860F09", LPSS_ADDR(byt_pwm_dev_desc) },
{ "80860F0A", LPSS_ADDR(byt_uart_dev_desc) },
{ "80860F0E", LPSS_ADDR(byt_spi_dev_desc) },
{ "80860F14", LPSS_ADDR(byt_sdio_dev_desc) },
{ "80860F41", LPSS_ADDR(byt_i2c_dev_desc) },
/* Braswell LPSS devices */
{ "80862286", LPSS_ADDR(lpss_dma_desc) },
{ "80862288", LPSS_ADDR(bsw_pwm_dev_desc) },
{ "80862289", LPSS_ADDR(bsw_pwm2_dev_desc) },
{ "8086228A", LPSS_ADDR(bsw_uart_dev_desc) },
{ "8086228E", LPSS_ADDR(bsw_spi_dev_desc) },
{ "808622C0", LPSS_ADDR(lpss_dma_desc) },
{ "808622C1", LPSS_ADDR(bsw_i2c_dev_desc) },
/* Broadwell LPSS devices */
{ "INT3430", LPSS_ADDR(lpt_spi_dev_desc) },
{ "INT3431", LPSS_ADDR(lpt_spi_dev_desc) },
{ "INT3432", LPSS_ADDR(lpt_i2c_dev_desc) },
{ "INT3433", LPSS_ADDR(lpt_i2c_dev_desc) },
{ "INT3434", LPSS_ADDR(lpt_uart_dev_desc) },
{ "INT3435", LPSS_ADDR(lpt_uart_dev_desc) },
{ "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) },
/* Wildcat Point LPSS devices */
{ "INT3438", LPSS_ADDR(lpt_spi_dev_desc) },
{ }
};
#ifdef CONFIG_X86_INTEL_LPSS
/* LPSS main clock device. */
static struct platform_device *lpss_clk_dev;
static inline void lpt_register_clock_device(void)
{
lpss_clk_dev = platform_device_register_simple("clk-lpss-atom",
PLATFORM_DEVID_NONE,
NULL, 0);
}
static int register_device_clock(struct acpi_device *adev,
struct lpss_private_data *pdata)
{
const struct lpss_device_desc *dev_desc = pdata->dev_desc;
const char *devname = dev_name(&adev->dev);
struct clk *clk;
struct lpss_clk_data *clk_data;
const char *parent, *clk_name;
void __iomem *prv_base;
if (!lpss_clk_dev)
lpt_register_clock_device();
if (IS_ERR(lpss_clk_dev))
return PTR_ERR(lpss_clk_dev);
clk_data = platform_get_drvdata(lpss_clk_dev);
if (!clk_data)
return -ENODEV;
clk = clk_data->clk;
if (!pdata->mmio_base
|| pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
return -ENODATA;
parent = clk_data->name;
prv_base = pdata->mmio_base + dev_desc->prv_offset;
if (pdata->fixed_clk_rate) {
clk = clk_register_fixed_rate(NULL, devname, parent, 0,
pdata->fixed_clk_rate);
goto out;
}
if (dev_desc->flags & LPSS_CLK_GATE) {
clk = clk_register_gate(NULL, devname, parent, 0,
prv_base, 0, 0, NULL);
parent = devname;
}
if (dev_desc->flags & LPSS_CLK_DIVIDER) {
/* Prevent division by zero */
if (!readl(prv_base))
writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base);
clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);
if (!clk_name)
return -ENOMEM;
clk = clk_register_fractional_divider(NULL, clk_name, parent,
0, prv_base, 1, 15, 16, 15,
CLK_FRAC_DIVIDER_POWER_OF_TWO_PS,
NULL);
parent = clk_name;
clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);
if (!clk_name) {
kfree(parent);
return -ENOMEM;
}
clk = clk_register_gate(NULL, clk_name, parent,
CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
prv_base, 31, 0, NULL);
kfree(parent);
kfree(clk_name);
}
out:
if (IS_ERR(clk))
return PTR_ERR(clk);
pdata->clk = clk;
clk_register_clkdev(clk, dev_desc->clk_con_id, devname);
return 0;
}
struct lpss_device_links {
const char *supplier_hid;
const char *supplier_uid;
const char *consumer_hid;
const char *consumer_uid;
u32 flags;
const struct dmi_system_id *dep_missing_ids;
};
/* Please keep this list sorted alphabetically by vendor and model */
static const struct dmi_system_id i2c1_dep_missing_dmi_ids[] = {
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "T200TA"),
},
},
{}
};
/*
* The _DEP method is used to identify dependencies but instead of creating
* device links for every handle in _DEP, only links in the following list are
* created. That is necessary because, in the general case, _DEP can refer to
* devices that might not have drivers, or that are on different buses, or where
* the supplier is not enumerated until after the consumer is probed.
*/
static const struct lpss_device_links lpss_device_links[] = {
/* CHT External sdcard slot controller depends on PMIC I2C ctrl */
{"808622C1", "7", "80860F14", "3", DL_FLAG_PM_RUNTIME},
/* CHT iGPU depends on PMIC I2C controller */
{"808622C1", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
/* BYT iGPU depends on the Embedded Controller I2C controller (UID 1) */
{"80860F41", "1", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME,
i2c1_dep_missing_dmi_ids},
/* BYT CR iGPU depends on PMIC I2C controller (UID 5 on CR) */
{"80860F41", "5", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
/* BYT iGPU depends on PMIC I2C controller (UID 7 on non CR) */
{"80860F41", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
};
static bool acpi_lpss_is_supplier(struct acpi_device *adev,
const struct lpss_device_links *link)
{
return acpi_dev_hid_uid_match(adev, link->supplier_hid, link->supplier_uid);
}
static bool acpi_lpss_is_consumer(struct acpi_device *adev,
const struct lpss_device_links *link)
{
return acpi_dev_hid_uid_match(adev, link->consumer_hid, link->consumer_uid);
}
struct hid_uid {
const char *hid;
const char *uid;
};
static int match_hid_uid(struct device *dev, const void *data)
{
struct acpi_device *adev = ACPI_COMPANION(dev);
const struct hid_uid *id = data;
if (!adev)
return 0;
return acpi_dev_hid_uid_match(adev, id->hid, id->uid);
}
static struct device *acpi_lpss_find_device(const char *hid, const char *uid)
{
struct device *dev;
struct hid_uid data = {
.hid = hid,
.uid = uid,
};
dev = bus_find_device(&platform_bus_type, NULL, &data, match_hid_uid);
if (dev)
return dev;
return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid);
}
static void acpi_lpss_link_consumer(struct device *dev1,
const struct lpss_device_links *link)
{
struct device *dev2;
dev2 = acpi_lpss_find_device(link->consumer_hid, link->consumer_uid);
if (!dev2)
return;
if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
|| acpi_device_dep(ACPI_HANDLE(dev2), ACPI_HANDLE(dev1)))
device_link_add(dev2, dev1, link->flags);
put_device(dev2);
}
static void acpi_lpss_link_supplier(struct device *dev1,
const struct lpss_device_links *link)
{
struct device *dev2;
dev2 = acpi_lpss_find_device(link->supplier_hid, link->supplier_uid);
if (!dev2)
return;
if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
|| acpi_device_dep(ACPI_HANDLE(dev1), ACPI_HANDLE(dev2)))
device_link_add(dev1, dev2, link->flags);
put_device(dev2);
}
static void acpi_lpss_create_device_links(struct acpi_device *adev,
struct platform_device *pdev)
{
int i;
for (i = 0; i < ARRAY_SIZE(lpss_device_links); i++) {
const struct lpss_device_links *link = &lpss_device_links[i];
if (acpi_lpss_is_supplier(adev, link))
acpi_lpss_link_consumer(&pdev->dev, link);
if (acpi_lpss_is_consumer(adev, link))
acpi_lpss_link_supplier(&pdev->dev, link);
}
}
static int acpi_lpss_create_device(struct acpi_device *adev,
const struct acpi_device_id *id)
{
const struct lpss_device_desc *dev_desc;
struct lpss_private_data *pdata;
struct resource_entry *rentry;
struct list_head resource_list;
struct platform_device *pdev;
int ret;
dev_desc = (const struct lpss_device_desc *)id->driver_data;
if (!dev_desc)
return -EINVAL;
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
INIT_LIST_HEAD(&resource_list);
ret = acpi_dev_get_memory_resources(adev, &resource_list);
if (ret < 0)
goto err_out;
rentry = list_first_entry_or_null(&resource_list, struct resource_entry, node);
if (rentry) {
if (dev_desc->prv_size_override)
pdata->mmio_size = dev_desc->prv_size_override;
else
pdata->mmio_size = resource_size(rentry->res);
pdata->mmio_base = ioremap(rentry->res->start, pdata->mmio_size);
}
acpi_dev_free_resource_list(&resource_list);
if (!pdata->mmio_base) {
/* Avoid acpi_bus_attach() instantiating a pdev for this dev. */
adev->pnp.type.platform_id = 0;
goto out_free;
}
pdata->adev = adev;
pdata->dev_desc = dev_desc;
if (dev_desc->setup)
dev_desc->setup(pdata);
if (dev_desc->flags & LPSS_CLK) {
ret = register_device_clock(adev, pdata);
if (ret)
goto out_free;
}
/*
* This works around a known issue in ACPI tables where LPSS devices
* have _PS0 and _PS3 without _PSC (and no power resources), so
* acpi_bus_init_power() will assume that the BIOS has put them into D0.
*/
acpi_device_fix_up_power(adev);
adev->driver_data = pdata;
pdev = acpi_create_platform_device(adev, dev_desc->properties);
if (IS_ERR_OR_NULL(pdev)) {
adev->driver_data = NULL;
ret = PTR_ERR(pdev);
goto err_out;
}
acpi_lpss_create_device_links(adev, pdev);
return 1;
out_free:
/* Skip the device, but continue the namespace scan */
ret = 0;
err_out:
kfree(pdata);
return ret;
}
static u32 __lpss_reg_read(struct lpss_private_data *pdata, unsigned int reg)
{
return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
}
static void __lpss_reg_write(u32 val, struct lpss_private_data *pdata,
unsigned int reg)
{
writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
}
static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
{
struct acpi_device *adev = ACPI_COMPANION(dev);
struct lpss_private_data *pdata;
unsigned long flags;
int ret;
if (WARN_ON(!adev))
return -ENODEV;
spin_lock_irqsave(&dev->power.lock, flags);
if (pm_runtime_suspended(dev)) {
ret = -EAGAIN;
goto out;
}
pdata = acpi_driver_data(adev);
if (WARN_ON(!pdata || !pdata->mmio_base)) {
ret = -ENODEV;
goto out;
}
*val = __lpss_reg_read(pdata, reg);
ret = 0;
out:
spin_unlock_irqrestore(&dev->power.lock, flags);
return ret;
}
static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
u32 ltr_value = 0;
unsigned int reg;
int ret;
reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
ret = lpss_reg_read(dev, reg, <r_value);
if (ret)
return ret;
return sysfs_emit(buf, "%08x\n", ltr_value);
}
static ssize_t lpss_ltr_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
u32 ltr_mode = 0;
char *outstr;
int ret;
ret = lpss_reg_read(dev, LPSS_GENERAL, <r_mode);
if (ret)
return ret;
outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
return sprintf(buf, "%s\n", outstr);
}
static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
static struct attribute *lpss_attrs[] = {
&dev_attr_auto_ltr.attr,
&dev_attr_sw_ltr.attr,
&dev_attr_ltr_mode.attr,
NULL,
};
static const struct attribute_group lpss_attr_group = {
.attrs = lpss_attrs,
.name = "lpss_ltr",
};
static void acpi_lpss_set_ltr(struct device *dev, s32 val)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
u32 ltr_mode, ltr_val;
ltr_mode = __lpss_reg_read(pdata, LPSS_GENERAL);
if (val < 0) {
if (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) {
ltr_mode &= ~LPSS_GENERAL_LTR_MODE_SW;
__lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
}
return;
}
ltr_val = __lpss_reg_read(pdata, LPSS_SW_LTR) & ~LPSS_LTR_SNOOP_MASK;
if (val >= LPSS_LTR_SNOOP_LAT_CUTOFF) {
ltr_val |= LPSS_LTR_SNOOP_LAT_32US;
val = LPSS_LTR_MAX_VAL;
} else if (val > LPSS_LTR_MAX_VAL) {
ltr_val |= LPSS_LTR_SNOOP_LAT_32US | LPSS_LTR_SNOOP_REQ;
val >>= LPSS_LTR_SNOOP_LAT_SHIFT;
} else {
ltr_val |= LPSS_LTR_SNOOP_LAT_1US | LPSS_LTR_SNOOP_REQ;
}
ltr_val |= val;
__lpss_reg_write(ltr_val, pdata, LPSS_SW_LTR);
if (!(ltr_mode & LPSS_GENERAL_LTR_MODE_SW)) {
ltr_mode |= LPSS_GENERAL_LTR_MODE_SW;
__lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
}
}
#ifdef CONFIG_PM
/**
* acpi_lpss_save_ctx() - Save the private registers of LPSS device
* @dev: LPSS device
* @pdata: pointer to the private data of the LPSS device
*
* Most LPSS devices have private registers which may loose their context when
* the device is powered down. acpi_lpss_save_ctx() saves those registers into
* prv_reg_ctx array.
*/
static void acpi_lpss_save_ctx(struct device *dev,
struct lpss_private_data *pdata)
{
unsigned int i;
for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
unsigned long offset = i * sizeof(u32);
pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset);
dev_dbg(dev, "saving 0x%08x from LPSS reg at offset 0x%02lx\n",
pdata->prv_reg_ctx[i], offset);
}
}
/**
* acpi_lpss_restore_ctx() - Restore the private registers of LPSS device
* @dev: LPSS device
* @pdata: pointer to the private data of the LPSS device
*
* Restores the registers that were previously stored with acpi_lpss_save_ctx().
*/
static void acpi_lpss_restore_ctx(struct device *dev,
struct lpss_private_data *pdata)
{
unsigned int i;
for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
unsigned long offset = i * sizeof(u32);
__lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset);
dev_dbg(dev, "restoring 0x%08x to LPSS reg at offset 0x%02lx\n",
pdata->prv_reg_ctx[i], offset);
}
}
static void acpi_lpss_d3_to_d0_delay(struct lpss_private_data *pdata)
{
/*
* The following delay is needed or the subsequent write operations may
* fail. The LPSS devices are actually PCI devices and the PCI spec
* expects 10ms delay before the device can be accessed after D3 to D0
* transition. However some platforms like BSW does not need this delay.
*/
unsigned int delay = 10; /* default 10ms delay */
if (pdata->dev_desc->flags & LPSS_NO_D3_DELAY)
delay = 0;
msleep(delay);
}
static int acpi_lpss_activate(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
int ret;
ret = acpi_dev_resume(dev);
if (ret)
return ret;
acpi_lpss_d3_to_d0_delay(pdata);
/*
* This is called only on ->probe() stage where a device is either in
* known state defined by BIOS or most likely powered off. Due to this
* we have to deassert reset line to be sure that ->probe() will
* recognize the device.
*/
if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))
lpss_deassert_reset(pdata);
if (pdata->dev_desc->flags & LPSS_SAVE_CTX_ONCE)
acpi_lpss_save_ctx(dev, pdata);
return 0;
}
static void acpi_lpss_dismiss(struct device *dev)
{
acpi_dev_suspend(dev, false);
}
/* IOSF SB for LPSS island */
#define LPSS_IOSF_UNIT_LPIOEP 0xA0
#define LPSS_IOSF_UNIT_LPIO1 0xAB
#define LPSS_IOSF_UNIT_LPIO2 0xAC
#define LPSS_IOSF_PMCSR 0x84
#define LPSS_PMCSR_D0 0
#define LPSS_PMCSR_D3hot 3
#define LPSS_PMCSR_Dx_MASK GENMASK(1, 0)
#define LPSS_IOSF_GPIODEF0 0x154
#define LPSS_GPIODEF0_DMA1_D3 BIT(2)
#define LPSS_GPIODEF0_DMA2_D3 BIT(3)
#define LPSS_GPIODEF0_DMA_D3_MASK GENMASK(3, 2)
#define LPSS_GPIODEF0_DMA_LLP BIT(13)
static DEFINE_MUTEX(lpss_iosf_mutex);
static bool lpss_iosf_d3_entered = true;
static void lpss_iosf_enter_d3_state(void)
{
u32 value1 = 0;
u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP;
u32 value2 = LPSS_PMCSR_D3hot;
u32 mask2 = LPSS_PMCSR_Dx_MASK;
/*
* PMC provides an information about actual status of the LPSS devices.
* Here we read the values related to LPSS power island, i.e. LPSS
* devices, excluding both LPSS DMA controllers, along with SCC domain.
*/
u32 func_dis, d3_sts_0, pmc_status;
int ret;
ret = pmc_atom_read(PMC_FUNC_DIS, &func_dis);
if (ret)
return;
mutex_lock(&lpss_iosf_mutex);
ret = pmc_atom_read(PMC_D3_STS_0, &d3_sts_0);
if (ret)
goto exit;
/*
* Get the status of entire LPSS power island per device basis.
* Shutdown both LPSS DMA controllers if and only if all other devices
* are already in D3hot.
*/
pmc_status = (~(d3_sts_0 | func_dis)) & pmc_atom_d3_mask;
if (pmc_status)
goto exit;
iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
LPSS_IOSF_PMCSR, value2, mask2);
iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE,
LPSS_IOSF_PMCSR, value2, mask2);
iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
LPSS_IOSF_GPIODEF0, value1, mask1);
lpss_iosf_d3_entered = true;
exit:
mutex_unlock(&lpss_iosf_mutex);
}
static void lpss_iosf_exit_d3_state(void)
{
u32 value1 = LPSS_GPIODEF0_DMA1_D3 | LPSS_GPIODEF0_DMA2_D3 |
LPSS_GPIODEF0_DMA_LLP;
u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP;
u32 value2 = LPSS_PMCSR_D0;
u32 mask2 = LPSS_PMCSR_Dx_MASK;
mutex_lock(&lpss_iosf_mutex);
if (!lpss_iosf_d3_entered)
goto exit;
lpss_iosf_d3_entered = false;
iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
LPSS_IOSF_GPIODEF0, value1, mask1);
iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE,
LPSS_IOSF_PMCSR, value2, mask2);
iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
LPSS_IOSF_PMCSR, value2, mask2);
exit:
mutex_unlock(&lpss_iosf_mutex);
}
static int acpi_lpss_suspend(struct device *dev, bool wakeup)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
int ret;
if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
acpi_lpss_save_ctx(dev, pdata);
ret = acpi_dev_suspend(dev, wakeup);
/*
* This call must be last in the sequence, otherwise PMC will return
* wrong status for devices being about to be powered off. See
* lpss_iosf_enter_d3_state() for further information.
*/
if (acpi_target_system_state() == ACPI_STATE_S0 &&
lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
lpss_iosf_enter_d3_state();
return ret;
}
static int acpi_lpss_resume(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
int ret;
/*
* This call is kept first to be in symmetry with
* acpi_lpss_runtime_suspend() one.
*/
if (lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
lpss_iosf_exit_d3_state();
ret = acpi_dev_resume(dev);
if (ret)
return ret;
acpi_lpss_d3_to_d0_delay(pdata);
if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))
acpi_lpss_restore_ctx(dev, pdata);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int acpi_lpss_do_suspend_late(struct device *dev)
{
int ret;
if (dev_pm_skip_suspend(dev))
return 0;
ret = pm_generic_suspend_late(dev);
return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
}
static int acpi_lpss_suspend_late(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
if (pdata->dev_desc->resume_from_noirq)
return 0;
return acpi_lpss_do_suspend_late(dev);
}
static int acpi_lpss_suspend_noirq(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
int ret;
if (pdata->dev_desc->resume_from_noirq) {
/*
* The driver's ->suspend_late callback will be invoked by
* acpi_lpss_do_suspend_late(), with the assumption that the
* driver really wanted to run that code in ->suspend_noirq, but
* it could not run after acpi_dev_suspend() and the driver
* expected the latter to be called in the "late" phase.
*/
ret = acpi_lpss_do_suspend_late(dev);
if (ret)
return ret;
}
return acpi_subsys_suspend_noirq(dev);
}
static int acpi_lpss_do_resume_early(struct device *dev)
{
int ret = acpi_lpss_resume(dev);
return ret ? ret : pm_generic_resume_early(dev);
}
static int acpi_lpss_resume_early(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
if (pdata->dev_desc->resume_from_noirq)
return 0;
if (dev_pm_skip_resume(dev))
return 0;
return acpi_lpss_do_resume_early(dev);
}
static int acpi_lpss_resume_noirq(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
int ret;
/* Follow acpi_subsys_resume_noirq(). */
if (dev_pm_skip_resume(dev))
return 0;
ret = pm_generic_resume_noirq(dev);
if (ret)
return ret;
if (!pdata->dev_desc->resume_from_noirq)
return 0;
/*
* The driver's ->resume_early callback will be invoked by
* acpi_lpss_do_resume_early(), with the assumption that the driver
* really wanted to run that code in ->resume_noirq, but it could not
* run before acpi_dev_resume() and the driver expected the latter to be
* called in the "early" phase.
*/
return acpi_lpss_do_resume_early(dev);
}
static int acpi_lpss_do_restore_early(struct device *dev)
{
int ret = acpi_lpss_resume(dev);
return ret ? ret : pm_generic_restore_early(dev);
}
static int acpi_lpss_restore_early(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
if (pdata->dev_desc->resume_from_noirq)
return 0;
return acpi_lpss_do_restore_early(dev);
}
static int acpi_lpss_restore_noirq(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
int ret;
ret = pm_generic_restore_noirq(dev);
if (ret)
return ret;
if (!pdata->dev_desc->resume_from_noirq)
return 0;
/* This is analogous to what happens in acpi_lpss_resume_noirq(). */
return acpi_lpss_do_restore_early(dev);
}
static int acpi_lpss_do_poweroff_late(struct device *dev)
{
int ret = pm_generic_poweroff_late(dev);
return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
}
static int acpi_lpss_poweroff_late(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
if (dev_pm_skip_suspend(dev))
return 0;
if (pdata->dev_desc->resume_from_noirq)
return 0;
return acpi_lpss_do_poweroff_late(dev);
}
static int acpi_lpss_poweroff_noirq(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
if (dev_pm_skip_suspend(dev))
return 0;
if (pdata->dev_desc->resume_from_noirq) {
/* This is analogous to the acpi_lpss_suspend_noirq() case. */
int ret = acpi_lpss_do_poweroff_late(dev);
if (ret)
return ret;
}
return pm_generic_poweroff_noirq(dev);
}
#endif /* CONFIG_PM_SLEEP */
static int acpi_lpss_runtime_suspend(struct device *dev)
{
int ret = pm_generic_runtime_suspend(dev);
return ret ? ret : acpi_lpss_suspend(dev, true);
}
static int acpi_lpss_runtime_resume(struct device *dev)
{
int ret = acpi_lpss_resume(dev);
return ret ? ret : pm_generic_runtime_resume(dev);
}
#endif /* CONFIG_PM */
static struct dev_pm_domain acpi_lpss_pm_domain = {
#ifdef CONFIG_PM
.activate = acpi_lpss_activate,
.dismiss = acpi_lpss_dismiss,
#endif
.ops = {
#ifdef CONFIG_PM
#ifdef CONFIG_PM_SLEEP
.prepare = acpi_subsys_prepare,
.complete = acpi_subsys_complete,
.suspend = acpi_subsys_suspend,
.suspend_late = acpi_lpss_suspend_late,
.suspend_noirq = acpi_lpss_suspend_noirq,
.resume_noirq = acpi_lpss_resume_noirq,
.resume_early = acpi_lpss_resume_early,
.freeze = acpi_subsys_freeze,
.poweroff = acpi_subsys_poweroff,
.poweroff_late = acpi_lpss_poweroff_late,
.poweroff_noirq = acpi_lpss_poweroff_noirq,
.restore_noirq = acpi_lpss_restore_noirq,
.restore_early = acpi_lpss_restore_early,
#endif
.runtime_suspend = acpi_lpss_runtime_suspend,
.runtime_resume = acpi_lpss_runtime_resume,
#endif
},
};
static int acpi_lpss_platform_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct platform_device *pdev = to_platform_device(data);
struct lpss_private_data *pdata;
struct acpi_device *adev;
const struct acpi_device_id *id;
id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
if (!id || !id->driver_data)
return 0;
adev = ACPI_COMPANION(&pdev->dev);
if (!adev)
return 0;
pdata = acpi_driver_data(adev);
if (!pdata)
return 0;
if (pdata->mmio_base &&
pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
return 0;
}
switch (action) {
case BUS_NOTIFY_BIND_DRIVER:
dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
break;
case BUS_NOTIFY_DRIVER_NOT_BOUND:
case BUS_NOTIFY_UNBOUND_DRIVER:
dev_pm_domain_set(&pdev->dev, NULL);
break;
case BUS_NOTIFY_ADD_DEVICE:
dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
if (pdata->dev_desc->flags & LPSS_LTR)
return sysfs_create_group(&pdev->dev.kobj,
&lpss_attr_group);
break;
case BUS_NOTIFY_DEL_DEVICE:
if (pdata->dev_desc->flags & LPSS_LTR)
sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
dev_pm_domain_set(&pdev->dev, NULL);
break;
default:
break;
}
return 0;
}
static struct notifier_block acpi_lpss_nb = {
.notifier_call = acpi_lpss_platform_notify,
};
static void acpi_lpss_bind(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR))
return;
if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)
dev->power.set_latency_tolerance = acpi_lpss_set_ltr;
else
dev_err(dev, "MMIO size insufficient to access LTR\n");
}
static void acpi_lpss_unbind(struct device *dev)
{
dev->power.set_latency_tolerance = NULL;
}
static struct acpi_scan_handler lpss_handler = {
.ids = acpi_lpss_device_ids,
.attach = acpi_lpss_create_device,
.bind = acpi_lpss_bind,
.unbind = acpi_lpss_unbind,
};
void __init acpi_lpss_init(void)
{
const struct x86_cpu_id *id;
int ret;
ret = lpss_atom_clk_init();
if (ret)
return;
id = x86_match_cpu(lpss_cpu_ids);
if (id)
lpss_quirks |= LPSS_QUIRK_ALWAYS_POWER_ON;
bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
acpi_scan_add_handler(&lpss_handler);
}
#else
static struct acpi_scan_handler lpss_handler = {
.ids = acpi_lpss_device_ids,
};
void __init acpi_lpss_init(void)
{
acpi_scan_add_handler(&lpss_handler);
}
#endif /* CONFIG_X86_INTEL_LPSS */
Codebase Browser
linux