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![Heikki Krogerus](/assets/img/avatar_default.png)
The UART driver, dw8250.c, needs some details regarding the Designware UART. For ACPI enumerated devices the values are hard-coded, but since the driver also reads the values from device properties, providing them with build-in properties. This allows us to later remove the hard-coded values from the driver. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
978 lines
25 KiB
C
978 lines
25 KiB
C
/*
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* ACPI support for Intel Lynxpoint LPSS.
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*
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* Copyright (C) 2013, Intel Corporation
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* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
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* Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/acpi.h>
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#include <linux/clkdev.h>
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#include <linux/clk-provider.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/clk-lpss.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_runtime.h>
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#include <linux/delay.h>
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#include "internal.h"
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ACPI_MODULE_NAME("acpi_lpss");
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#ifdef CONFIG_X86_INTEL_LPSS
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#include <asm/cpu_device_id.h>
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#include <asm/intel-family.h>
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#include <asm/iosf_mbi.h>
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#include <asm/pmc_atom.h>
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#define LPSS_ADDR(desc) ((unsigned long)&desc)
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#define LPSS_CLK_SIZE 0x04
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#define LPSS_LTR_SIZE 0x18
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/* Offsets relative to LPSS_PRIVATE_OFFSET */
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#define LPSS_CLK_DIVIDER_DEF_MASK (BIT(1) | BIT(16))
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#define LPSS_RESETS 0x04
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#define LPSS_RESETS_RESET_FUNC BIT(0)
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#define LPSS_RESETS_RESET_APB BIT(1)
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#define LPSS_GENERAL 0x08
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#define LPSS_GENERAL_LTR_MODE_SW BIT(2)
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#define LPSS_GENERAL_UART_RTS_OVRD BIT(3)
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#define LPSS_SW_LTR 0x10
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#define LPSS_AUTO_LTR 0x14
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#define LPSS_LTR_SNOOP_REQ BIT(15)
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#define LPSS_LTR_SNOOP_MASK 0x0000FFFF
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#define LPSS_LTR_SNOOP_LAT_1US 0x800
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#define LPSS_LTR_SNOOP_LAT_32US 0xC00
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#define LPSS_LTR_SNOOP_LAT_SHIFT 5
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#define LPSS_LTR_SNOOP_LAT_CUTOFF 3000
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#define LPSS_LTR_MAX_VAL 0x3FF
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#define LPSS_TX_INT 0x20
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#define LPSS_TX_INT_MASK BIT(1)
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#define LPSS_PRV_REG_COUNT 9
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/* LPSS Flags */
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#define LPSS_CLK BIT(0)
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#define LPSS_CLK_GATE BIT(1)
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#define LPSS_CLK_DIVIDER BIT(2)
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#define LPSS_LTR BIT(3)
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#define LPSS_SAVE_CTX BIT(4)
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#define LPSS_NO_D3_DELAY BIT(5)
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struct lpss_private_data;
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struct lpss_device_desc {
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unsigned int flags;
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const char *clk_con_id;
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unsigned int prv_offset;
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size_t prv_size_override;
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struct property_entry *properties;
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void (*setup)(struct lpss_private_data *pdata);
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};
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static const struct lpss_device_desc lpss_dma_desc = {
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.flags = LPSS_CLK,
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};
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struct lpss_private_data {
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void __iomem *mmio_base;
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resource_size_t mmio_size;
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unsigned int fixed_clk_rate;
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struct clk *clk;
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const struct lpss_device_desc *dev_desc;
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u32 prv_reg_ctx[LPSS_PRV_REG_COUNT];
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};
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/* LPSS run time quirks */
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static unsigned int lpss_quirks;
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/*
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* LPSS_QUIRK_ALWAYS_POWER_ON: override power state for LPSS DMA device.
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*
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* The LPSS DMA controller has neither _PS0 nor _PS3 method. Moreover
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* it can be powered off automatically whenever the last LPSS device goes down.
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* In case of no power any access to the DMA controller will hang the system.
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* The behaviour is reproduced on some HP laptops based on Intel BayTrail as
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* well as on ASuS T100TA transformer.
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*
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* This quirk overrides power state of entire LPSS island to keep DMA powered
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* on whenever we have at least one other device in use.
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*/
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#define LPSS_QUIRK_ALWAYS_POWER_ON BIT(0)
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/* UART Component Parameter Register */
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#define LPSS_UART_CPR 0xF4
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#define LPSS_UART_CPR_AFCE BIT(4)
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static void lpss_uart_setup(struct lpss_private_data *pdata)
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{
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unsigned int offset;
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u32 val;
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offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
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val = readl(pdata->mmio_base + offset);
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writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);
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val = readl(pdata->mmio_base + LPSS_UART_CPR);
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if (!(val & LPSS_UART_CPR_AFCE)) {
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offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;
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val = readl(pdata->mmio_base + offset);
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val |= LPSS_GENERAL_UART_RTS_OVRD;
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writel(val, pdata->mmio_base + offset);
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}
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}
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static void lpss_deassert_reset(struct lpss_private_data *pdata)
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{
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unsigned int offset;
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u32 val;
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offset = pdata->dev_desc->prv_offset + LPSS_RESETS;
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val = readl(pdata->mmio_base + offset);
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val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;
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writel(val, pdata->mmio_base + offset);
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}
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#define LPSS_I2C_ENABLE 0x6c
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static void byt_i2c_setup(struct lpss_private_data *pdata)
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{
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lpss_deassert_reset(pdata);
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if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))
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pdata->fixed_clk_rate = 133000000;
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writel(0, pdata->mmio_base + LPSS_I2C_ENABLE);
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}
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static const struct lpss_device_desc lpt_dev_desc = {
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.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR,
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.prv_offset = 0x800,
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};
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static const struct lpss_device_desc lpt_i2c_dev_desc = {
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.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR,
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.prv_offset = 0x800,
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};
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static struct property_entry uart_properties[] = {
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PROPERTY_ENTRY_U32("reg-io-width", 4),
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PROPERTY_ENTRY_U32("reg-shift", 2),
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PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
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{ },
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};
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static const struct lpss_device_desc lpt_uart_dev_desc = {
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.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR,
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.clk_con_id = "baudclk",
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.prv_offset = 0x800,
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.setup = lpss_uart_setup,
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.properties = uart_properties,
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};
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static const struct lpss_device_desc lpt_sdio_dev_desc = {
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.flags = LPSS_LTR,
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.prv_offset = 0x1000,
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.prv_size_override = 0x1018,
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};
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static const struct lpss_device_desc byt_pwm_dev_desc = {
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.flags = LPSS_SAVE_CTX,
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};
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static const struct lpss_device_desc bsw_pwm_dev_desc = {
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.flags = LPSS_SAVE_CTX | LPSS_NO_D3_DELAY,
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};
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static const struct lpss_device_desc byt_uart_dev_desc = {
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.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
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.clk_con_id = "baudclk",
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.prv_offset = 0x800,
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.setup = lpss_uart_setup,
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.properties = uart_properties,
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};
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static const struct lpss_device_desc bsw_uart_dev_desc = {
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.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
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| LPSS_NO_D3_DELAY,
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.clk_con_id = "baudclk",
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.prv_offset = 0x800,
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.setup = lpss_uart_setup,
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.properties = uart_properties,
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};
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static const struct lpss_device_desc byt_spi_dev_desc = {
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.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
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.prv_offset = 0x400,
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};
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static const struct lpss_device_desc byt_sdio_dev_desc = {
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.flags = LPSS_CLK,
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};
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static const struct lpss_device_desc byt_i2c_dev_desc = {
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.flags = LPSS_CLK | LPSS_SAVE_CTX,
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.prv_offset = 0x800,
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.setup = byt_i2c_setup,
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};
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static const struct lpss_device_desc bsw_i2c_dev_desc = {
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.flags = LPSS_CLK | LPSS_SAVE_CTX | LPSS_NO_D3_DELAY,
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.prv_offset = 0x800,
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.setup = byt_i2c_setup,
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};
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static const struct lpss_device_desc bsw_spi_dev_desc = {
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.flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
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| LPSS_NO_D3_DELAY,
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.prv_offset = 0x400,
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.setup = lpss_deassert_reset,
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};
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#define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
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static const struct x86_cpu_id lpss_cpu_ids[] = {
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ICPU(INTEL_FAM6_ATOM_SILVERMONT1), /* Valleyview, Bay Trail */
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ICPU(INTEL_FAM6_ATOM_AIRMONT), /* Braswell, Cherry Trail */
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{}
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};
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#else
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#define LPSS_ADDR(desc) (0UL)
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#endif /* CONFIG_X86_INTEL_LPSS */
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static const struct acpi_device_id acpi_lpss_device_ids[] = {
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/* Generic LPSS devices */
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{ "INTL9C60", LPSS_ADDR(lpss_dma_desc) },
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/* Lynxpoint LPSS devices */
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{ "INT33C0", LPSS_ADDR(lpt_dev_desc) },
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{ "INT33C1", LPSS_ADDR(lpt_dev_desc) },
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{ "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc) },
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{ "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc) },
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{ "INT33C4", LPSS_ADDR(lpt_uart_dev_desc) },
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{ "INT33C5", LPSS_ADDR(lpt_uart_dev_desc) },
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{ "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc) },
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{ "INT33C7", },
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/* BayTrail LPSS devices */
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{ "80860F09", LPSS_ADDR(byt_pwm_dev_desc) },
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{ "80860F0A", LPSS_ADDR(byt_uart_dev_desc) },
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{ "80860F0E", LPSS_ADDR(byt_spi_dev_desc) },
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{ "80860F14", LPSS_ADDR(byt_sdio_dev_desc) },
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{ "80860F41", LPSS_ADDR(byt_i2c_dev_desc) },
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{ "INT33B2", },
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{ "INT33FC", },
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/* Braswell LPSS devices */
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{ "80862288", LPSS_ADDR(bsw_pwm_dev_desc) },
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{ "8086228A", LPSS_ADDR(bsw_uart_dev_desc) },
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{ "8086228E", LPSS_ADDR(bsw_spi_dev_desc) },
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{ "808622C1", LPSS_ADDR(bsw_i2c_dev_desc) },
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/* Broadwell LPSS devices */
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{ "INT3430", LPSS_ADDR(lpt_dev_desc) },
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{ "INT3431", LPSS_ADDR(lpt_dev_desc) },
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{ "INT3432", LPSS_ADDR(lpt_i2c_dev_desc) },
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{ "INT3433", LPSS_ADDR(lpt_i2c_dev_desc) },
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{ "INT3434", LPSS_ADDR(lpt_uart_dev_desc) },
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{ "INT3435", LPSS_ADDR(lpt_uart_dev_desc) },
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{ "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) },
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{ "INT3437", },
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/* Wildcat Point LPSS devices */
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{ "INT3438", LPSS_ADDR(lpt_dev_desc) },
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{ }
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};
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#ifdef CONFIG_X86_INTEL_LPSS
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static int is_memory(struct acpi_resource *res, void *not_used)
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{
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struct resource r;
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return !acpi_dev_resource_memory(res, &r);
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}
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/* LPSS main clock device. */
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static struct platform_device *lpss_clk_dev;
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static inline void lpt_register_clock_device(void)
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{
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lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
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}
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static int register_device_clock(struct acpi_device *adev,
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struct lpss_private_data *pdata)
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{
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const struct lpss_device_desc *dev_desc = pdata->dev_desc;
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const char *devname = dev_name(&adev->dev);
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struct clk *clk = ERR_PTR(-ENODEV);
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struct lpss_clk_data *clk_data;
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const char *parent, *clk_name;
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void __iomem *prv_base;
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if (!lpss_clk_dev)
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lpt_register_clock_device();
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clk_data = platform_get_drvdata(lpss_clk_dev);
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if (!clk_data)
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return -ENODEV;
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clk = clk_data->clk;
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if (!pdata->mmio_base
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|| pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
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return -ENODATA;
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parent = clk_data->name;
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prv_base = pdata->mmio_base + dev_desc->prv_offset;
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if (pdata->fixed_clk_rate) {
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clk = clk_register_fixed_rate(NULL, devname, parent, 0,
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pdata->fixed_clk_rate);
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goto out;
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}
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if (dev_desc->flags & LPSS_CLK_GATE) {
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clk = clk_register_gate(NULL, devname, parent, 0,
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prv_base, 0, 0, NULL);
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parent = devname;
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}
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if (dev_desc->flags & LPSS_CLK_DIVIDER) {
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/* Prevent division by zero */
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if (!readl(prv_base))
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writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base);
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clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);
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if (!clk_name)
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return -ENOMEM;
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clk = clk_register_fractional_divider(NULL, clk_name, parent,
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0, prv_base,
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1, 15, 16, 15, 0, NULL);
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parent = clk_name;
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clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);
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if (!clk_name) {
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kfree(parent);
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return -ENOMEM;
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}
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clk = clk_register_gate(NULL, clk_name, parent,
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CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
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prv_base, 31, 0, NULL);
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kfree(parent);
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kfree(clk_name);
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}
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out:
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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pdata->clk = clk;
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clk_register_clkdev(clk, dev_desc->clk_con_id, devname);
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return 0;
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}
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static int acpi_lpss_create_device(struct acpi_device *adev,
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const struct acpi_device_id *id)
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{
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const struct lpss_device_desc *dev_desc;
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struct lpss_private_data *pdata;
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struct resource_entry *rentry;
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struct list_head resource_list;
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struct platform_device *pdev;
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int ret;
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dev_desc = (const struct lpss_device_desc *)id->driver_data;
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if (!dev_desc) {
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pdev = acpi_create_platform_device(adev);
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return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
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}
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pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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INIT_LIST_HEAD(&resource_list);
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ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
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if (ret < 0)
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goto err_out;
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list_for_each_entry(rentry, &resource_list, node)
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if (resource_type(rentry->res) == IORESOURCE_MEM) {
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if (dev_desc->prv_size_override)
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pdata->mmio_size = dev_desc->prv_size_override;
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else
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pdata->mmio_size = resource_size(rentry->res);
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pdata->mmio_base = ioremap(rentry->res->start,
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pdata->mmio_size);
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break;
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}
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acpi_dev_free_resource_list(&resource_list);
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if (!pdata->mmio_base) {
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ret = -ENOMEM;
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goto err_out;
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}
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pdata->dev_desc = dev_desc;
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if (dev_desc->setup)
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dev_desc->setup(pdata);
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if (dev_desc->flags & LPSS_CLK) {
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ret = register_device_clock(adev, pdata);
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if (ret) {
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/* Skip the device, but continue the namespace scan. */
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ret = 0;
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goto err_out;
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}
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}
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/*
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* This works around a known issue in ACPI tables where LPSS devices
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* have _PS0 and _PS3 without _PSC (and no power resources), so
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* acpi_bus_init_power() will assume that the BIOS has put them into D0.
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*/
|
|
ret = acpi_device_fix_up_power(adev);
|
|
if (ret) {
|
|
/* Skip the device, but continue the namespace scan. */
|
|
ret = 0;
|
|
goto err_out;
|
|
}
|
|
|
|
if (dev_desc->properties) {
|
|
ret = device_add_properties(&adev->dev, dev_desc->properties);
|
|
if (ret)
|
|
goto err_out;
|
|
}
|
|
|
|
adev->driver_data = pdata;
|
|
pdev = acpi_create_platform_device(adev);
|
|
if (!IS_ERR_OR_NULL(pdev)) {
|
|
return 1;
|
|
}
|
|
|
|
ret = PTR_ERR(pdev);
|
|
adev->driver_data = NULL;
|
|
|
|
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;
|
|
struct lpss_private_data *pdata;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev);
|
|
if (WARN_ON(ret))
|
|
return ret;
|
|
|
|
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);
|
|
|
|
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 snprintf(buf, PAGE_SIZE, "%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 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_runtime_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_deassert_reset(pdata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void acpi_lpss_dismiss(struct device *dev)
|
|
{
|
|
acpi_dev_runtime_suspend(dev);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int acpi_lpss_suspend_late(struct device *dev)
|
|
{
|
|
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
|
|
int ret;
|
|
|
|
ret = pm_generic_suspend_late(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
|
|
acpi_lpss_save_ctx(dev, pdata);
|
|
|
|
return acpi_dev_suspend_late(dev);
|
|
}
|
|
|
|
static int acpi_lpss_resume_early(struct device *dev)
|
|
{
|
|
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
|
|
int ret;
|
|
|
|
ret = acpi_dev_resume_early(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
acpi_lpss_d3_to_d0_delay(pdata);
|
|
|
|
if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
|
|
acpi_lpss_restore_ctx(dev, pdata);
|
|
|
|
return pm_generic_resume_early(dev);
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
/* 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)
|
|
|
|
static DEFINE_MUTEX(lpss_iosf_mutex);
|
|
|
|
static void lpss_iosf_enter_d3_state(void)
|
|
{
|
|
u32 value1 = 0;
|
|
u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK;
|
|
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, pmc_mask = 0xfe000ffe;
|
|
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_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);
|
|
exit:
|
|
mutex_unlock(&lpss_iosf_mutex);
|
|
}
|
|
|
|
static void lpss_iosf_exit_d3_state(void)
|
|
{
|
|
u32 value1 = LPSS_GPIODEF0_DMA1_D3 | LPSS_GPIODEF0_DMA2_D3;
|
|
u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK;
|
|
u32 value2 = LPSS_PMCSR_D0;
|
|
u32 mask2 = LPSS_PMCSR_Dx_MASK;
|
|
|
|
mutex_lock(&lpss_iosf_mutex);
|
|
|
|
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);
|
|
|
|
mutex_unlock(&lpss_iosf_mutex);
|
|
}
|
|
|
|
static int acpi_lpss_runtime_suspend(struct device *dev)
|
|
{
|
|
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
|
|
int ret;
|
|
|
|
ret = pm_generic_runtime_suspend(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
|
|
acpi_lpss_save_ctx(dev, pdata);
|
|
|
|
ret = acpi_dev_runtime_suspend(dev);
|
|
|
|
/*
|
|
* 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 (lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
|
|
lpss_iosf_enter_d3_state();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_lpss_runtime_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_runtime_resume(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
acpi_lpss_d3_to_d0_delay(pdata);
|
|
|
|
if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
|
|
acpi_lpss_restore_ctx(dev, pdata);
|
|
|
|
return 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 = pm_complete_with_resume_check,
|
|
.suspend = acpi_subsys_suspend,
|
|
.suspend_late = acpi_lpss_suspend_late,
|
|
.resume_early = acpi_lpss_resume_early,
|
|
.freeze = acpi_subsys_freeze,
|
|
.poweroff = acpi_subsys_suspend,
|
|
.poweroff_late = acpi_lpss_suspend_late,
|
|
.restore_early = acpi_lpss_resume_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;
|
|
|
|
if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &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 = lpt_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 */
|