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openwrt/target/linux/qualcommax/patches-6.1/0900-power-Add-Qualcomm-APM...

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From 6c98adf98236b8644b8f5e1aa7af9f1a88ea2766 Mon Sep 17 00:00:00 2001
From: Robert Marko <robimarko@gmail.com>
Date: Mon, 11 Apr 2022 14:38:08 +0200
Subject: [PATCH] power: Add Qualcomm APM
Add Qualcomm APM driver, which allows scaling cache and memory fabrics.
Signed-off-by: Robert Marko <robimarko@gmail.com>
---
drivers/power/Kconfig | 1 +
drivers/power/Makefile | 1 +
drivers/power/qcom/Kconfig | 7 +
drivers/power/qcom/Makefile | 1 +
drivers/power/qcom/apm.c | 944 +++++++++++++++++++++++++++++++++
include/linux/power/qcom/apm.h | 48 ++
6 files changed, 1002 insertions(+)
create mode 100644 drivers/power/qcom/Kconfig
create mode 100644 drivers/power/qcom/Makefile
create mode 100644 drivers/power/qcom/apm.c
create mode 100644 include/linux/power/qcom/apm.h
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0-only
source "drivers/power/reset/Kconfig"
source "drivers/power/supply/Kconfig"
+source "drivers/power/qcom/Kconfig"
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_POWER_RESET) += reset/
obj-$(CONFIG_POWER_SUPPLY) += supply/
+obj-$(CONFIG_QCOM_APM) += qcom/
--- /dev/null
+++ b/drivers/power/qcom/Kconfig
@@ -0,0 +1,7 @@
+config QCOM_APM
+ bool "Qualcomm Technologies Inc platform specific APM driver"
+ help
+ Platform specific driver to manage the power source of
+ memory arrays. Interfaces with regulator drivers to ensure
+ SRAM Vmin requirements are met across different performance
+ levels.
--- /dev/null
+++ b/drivers/power/qcom/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_QCOM_APM) += apm.o
--- /dev/null
+++ b/drivers/power/qcom/apm.c
@@ -0,0 +1,944 @@
+/*
+ * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/of_device.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/power/qcom/apm.h>
+
+/*
+ * VDD_APCC
+ * =============================================================
+ * | VDD_MX | |
+ * | ==========================|============= |
+ * ___|___ ___|___ ___|___ ___|___ ___|___ ___|___
+ * | | | | | | | | | | | |
+ * | APCC | | MX HS | | MX HS | | APCC | | MX HS | | APCC |
+ * | HS | | | | | | HS | | | | HS |
+ * |_______| |_______| |_______| |_______| |_______| |_______|
+ * |_________| |_________| |__________|
+ * | | |
+ * ______|_____ ______|_____ _______|_____
+ * | | | | | |
+ * | | | | | |
+ * | CPU MEM | | L2 MEM | | L3 MEM |
+ * | Arrays | | Arrays | | Arrays |
+ * | | | | | |
+ * |____________| |____________| |_____________|
+ *
+ */
+
+/* Register value definitions */
+#define APCS_GFMUXA_SEL_VAL 0x13
+#define APCS_GFMUXA_DESEL_VAL 0x03
+#define MSM_APM_MX_MODE_VAL 0x00
+#define MSM_APM_APCC_MODE_VAL 0x10
+#define MSM_APM_MX_DONE_VAL 0x00
+#define MSM_APM_APCC_DONE_VAL 0x03
+#define MSM_APM_OVERRIDE_SEL_VAL 0xb0
+#define MSM_APM_SEC_CLK_SEL_VAL 0x30
+#define SPM_EVENT_SET_VAL 0x01
+#define SPM_EVENT_CLEAR_VAL 0x00
+
+/* Register bit mask definitions */
+#define MSM_APM_CTL_STS_MASK 0x0f
+
+/* Register offset definitions */
+#define APCC_APM_MODE 0x00000098
+#define APCC_APM_CTL_STS 0x000000a8
+#define APCS_SPARE 0x00000068
+#define APCS_VERSION 0x00000fd0
+
+#define HMSS_VERSION_1P2 0x10020000
+
+#define MSM_APM_SWITCH_TIMEOUT_US 10
+#define SPM_WAKEUP_DELAY_US 2
+#define SPM_EVENT_NUM 6
+
+#define MSM_APM_DRIVER_NAME "qcom,msm-apm"
+
+enum {
+ MSM8996_ID,
+ MSM8953_ID,
+ IPQ807x_ID,
+};
+
+struct msm_apm_ctrl_dev {
+ struct list_head list;
+ struct device *dev;
+ enum msm_apm_supply supply;
+ spinlock_t lock;
+ void __iomem *reg_base;
+ void __iomem *apcs_csr_base;
+ void __iomem **apcs_spm_events_addr;
+ void __iomem *apc0_pll_ctl_addr;
+ void __iomem *apc1_pll_ctl_addr;
+ u32 version;
+ struct dentry *debugfs;
+ u32 msm_id;
+};
+
+#if defined(CONFIG_DEBUG_FS)
+static struct dentry *apm_debugfs_base;
+#endif
+
+static DEFINE_MUTEX(apm_ctrl_list_mutex);
+static LIST_HEAD(apm_ctrl_list);
+
+/*
+ * Get the resources associated with the APM controller from device tree
+ * and remap all I/O addresses that are relevant to this HW revision.
+ */
+static int msm_apm_ctrl_devm_ioremap(struct platform_device *pdev,
+ struct msm_apm_ctrl_dev *ctrl)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ static const char *res_name[SPM_EVENT_NUM] = {
+ "apc0-l2-spm",
+ "apc1-l2-spm",
+ "apc0-cpu0-spm",
+ "apc0-cpu1-spm",
+ "apc1-cpu0-spm",
+ "apc1-cpu1-spm"
+ };
+ int i, ret = 0;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pm-apcc-glb");
+ if (!res) {
+ dev_err(dev, "Missing PM APCC Global register physical address");
+ return -EINVAL;
+ }
+ ctrl->reg_base = devm_ioremap(dev, res->start, resource_size(res));
+ if (!ctrl->reg_base) {
+ dev_err(dev, "Failed to map PM APCC Global registers\n");
+ return -ENOMEM;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "apcs-csr");
+ if (!res) {
+ dev_err(dev, "Missing APCS CSR physical base address");
+ return -EINVAL;
+ }
+ ctrl->apcs_csr_base = devm_ioremap(dev, res->start, resource_size(res));
+ if (!ctrl->apcs_csr_base) {
+ dev_err(dev, "Failed to map APCS CSR registers\n");
+ return -ENOMEM;
+ }
+
+ ctrl->version = readl_relaxed(ctrl->apcs_csr_base + APCS_VERSION);
+
+ if (ctrl->version >= HMSS_VERSION_1P2)
+ return ret;
+
+ ctrl->apcs_spm_events_addr = devm_kzalloc(&pdev->dev,
+ SPM_EVENT_NUM
+ * sizeof(void __iomem *),
+ GFP_KERNEL);
+ if (!ctrl->apcs_spm_events_addr) {
+ dev_err(dev, "Failed to allocate memory for APCS SPM event registers\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < SPM_EVENT_NUM; i++) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ res_name[i]);
+ if (!res) {
+ dev_err(dev, "Missing address for %s\n", res_name[i]);
+ ret = -EINVAL;
+ goto free_events;
+ }
+
+ ctrl->apcs_spm_events_addr[i] = devm_ioremap(dev, res->start,
+ resource_size(res));
+ if (!ctrl->apcs_spm_events_addr[i]) {
+ dev_err(dev, "Failed to map %s\n", res_name[i]);
+ ret = -ENOMEM;
+ goto free_events;
+ }
+
+ dev_dbg(dev, "%s event phys: %pa virt:0x%p\n", res_name[i],
+ &res->start, ctrl->apcs_spm_events_addr[i]);
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "apc0-pll-ctl");
+ if (!res) {
+ dev_err(dev, "Missing APC0 PLL CTL physical address\n");
+ ret = -EINVAL;
+ goto free_events;
+ }
+
+ ctrl->apc0_pll_ctl_addr = devm_ioremap(dev,
+ res->start,
+ resource_size(res));
+ if (!ctrl->apc0_pll_ctl_addr) {
+ dev_err(dev, "Failed to map APC0 PLL CTL register\n");
+ ret = -ENOMEM;
+ goto free_events;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "apc1-pll-ctl");
+ if (!res) {
+ dev_err(dev, "Missing APC1 PLL CTL physical address\n");
+ ret = -EINVAL;
+ goto free_events;
+ }
+
+ ctrl->apc1_pll_ctl_addr = devm_ioremap(dev,
+ res->start,
+ resource_size(res));
+ if (!ctrl->apc1_pll_ctl_addr) {
+ dev_err(dev, "Failed to map APC1 PLL CTL register\n");
+ ret = -ENOMEM;
+ goto free_events;
+ }
+
+ return ret;
+
+free_events:
+ devm_kfree(dev, ctrl->apcs_spm_events_addr);
+ return ret;
+}
+
+/* 8953 register offset definition */
+#define MSM8953_APM_DLY_CNTR 0x2ac
+
+/* Register field shift definitions */
+#define APM_CTL_SEL_SWITCH_DLY_SHIFT 0
+#define APM_CTL_RESUME_CLK_DLY_SHIFT 8
+#define APM_CTL_HALT_CLK_DLY_SHIFT 16
+#define APM_CTL_POST_HALT_DLY_SHIFT 24
+
+/* Register field mask definitions */
+#define APM_CTL_SEL_SWITCH_DLY_MASK GENMASK(7, 0)
+#define APM_CTL_RESUME_CLK_DLY_MASK GENMASK(15, 8)
+#define APM_CTL_HALT_CLK_DLY_MASK GENMASK(23, 16)
+#define APM_CTL_POST_HALT_DLY_MASK GENMASK(31, 24)
+
+/*
+ * Get the resources associated with the msm8953 APM controller from
+ * device tree, remap all I/O addresses, and program the initial
+ * register configuration required for the 8953 APM controller device.
+ */
+static int msm8953_apm_ctrl_init(struct platform_device *pdev,
+ struct msm_apm_ctrl_dev *ctrl)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ u32 delay_counter, val = 0, regval = 0;
+ int rc = 0;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pm-apcc-glb");
+ if (!res) {
+ dev_err(dev, "Missing PM APCC Global register physical address\n");
+ return -ENODEV;
+ }
+ ctrl->reg_base = devm_ioremap(dev, res->start, resource_size(res));
+ if (!ctrl->reg_base) {
+ dev_err(dev, "Failed to map PM APCC Global registers\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * Initial APM register configuration required before starting
+ * APM HW controller.
+ */
+ regval = readl_relaxed(ctrl->reg_base + MSM8953_APM_DLY_CNTR);
+ val = regval;
+
+ if (of_find_property(dev->of_node, "qcom,apm-post-halt-delay", NULL)) {
+ rc = of_property_read_u32(dev->of_node,
+ "qcom,apm-post-halt-delay", &delay_counter);
+ if (rc < 0) {
+ dev_err(dev, "apm-post-halt-delay read failed, rc = %d",
+ rc);
+ return rc;
+ }
+
+ val &= ~APM_CTL_POST_HALT_DLY_MASK;
+ val |= (delay_counter << APM_CTL_POST_HALT_DLY_SHIFT)
+ & APM_CTL_POST_HALT_DLY_MASK;
+ }
+
+ if (of_find_property(dev->of_node, "qcom,apm-halt-clk-delay", NULL)) {
+ rc = of_property_read_u32(dev->of_node,
+ "qcom,apm-halt-clk-delay", &delay_counter);
+ if (rc < 0) {
+ dev_err(dev, "apm-halt-clk-delay read failed, rc = %d",
+ rc);
+ return rc;
+ }
+
+ val &= ~APM_CTL_HALT_CLK_DLY_MASK;
+ val |= (delay_counter << APM_CTL_HALT_CLK_DLY_SHIFT)
+ & APM_CTL_HALT_CLK_DLY_MASK;
+ }
+
+ if (of_find_property(dev->of_node, "qcom,apm-resume-clk-delay", NULL)) {
+ rc = of_property_read_u32(dev->of_node,
+ "qcom,apm-resume-clk-delay", &delay_counter);
+ if (rc < 0) {
+ dev_err(dev, "apm-resume-clk-delay read failed, rc = %d",
+ rc);
+ return rc;
+ }
+
+ val &= ~APM_CTL_RESUME_CLK_DLY_MASK;
+ val |= (delay_counter << APM_CTL_RESUME_CLK_DLY_SHIFT)
+ & APM_CTL_RESUME_CLK_DLY_MASK;
+ }
+
+ if (of_find_property(dev->of_node, "qcom,apm-sel-switch-delay", NULL)) {
+ rc = of_property_read_u32(dev->of_node,
+ "qcom,apm-sel-switch-delay", &delay_counter);
+ if (rc < 0) {
+ dev_err(dev, "apm-sel-switch-delay read failed, rc = %d",
+ rc);
+ return rc;
+ }
+
+ val &= ~APM_CTL_SEL_SWITCH_DLY_MASK;
+ val |= (delay_counter << APM_CTL_SEL_SWITCH_DLY_SHIFT)
+ & APM_CTL_SEL_SWITCH_DLY_MASK;
+ }
+
+ if (val != regval) {
+ writel_relaxed(val, ctrl->reg_base + MSM8953_APM_DLY_CNTR);
+ /* make sure write completes before return */
+ mb();
+ }
+
+ return rc;
+}
+
+static int msm8996_apm_switch_to_mx(struct msm_apm_ctrl_dev *ctrl_dev)
+{
+ int i, timeout = MSM_APM_SWITCH_TIMEOUT_US;
+ u32 regval;
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctrl_dev->lock, flags);
+
+ /* Perform revision-specific programming steps */
+ if (ctrl_dev->version < HMSS_VERSION_1P2) {
+ /* Clear SPM events */
+ for (i = 0; i < SPM_EVENT_NUM; i++)
+ writel_relaxed(SPM_EVENT_CLEAR_VAL,
+ ctrl_dev->apcs_spm_events_addr[i]);
+
+ udelay(SPM_WAKEUP_DELAY_US);
+
+ /* Switch APC/CBF to GPLL0 clock */
+ writel_relaxed(APCS_GFMUXA_SEL_VAL,
+ ctrl_dev->apcs_csr_base + APCS_SPARE);
+ ndelay(200);
+ writel_relaxed(MSM_APM_OVERRIDE_SEL_VAL,
+ ctrl_dev->apc0_pll_ctl_addr);
+ ndelay(200);
+ writel_relaxed(MSM_APM_OVERRIDE_SEL_VAL,
+ ctrl_dev->apc1_pll_ctl_addr);
+
+ /* Ensure writes complete before proceeding */
+ mb();
+ }
+
+ /* Switch arrays to MX supply and wait for its completion */
+ writel_relaxed(MSM_APM_MX_MODE_VAL, ctrl_dev->reg_base +
+ APCC_APM_MODE);
+
+ /* Ensure write above completes before delaying */
+ mb();
+
+ while (timeout > 0) {
+ regval = readl_relaxed(ctrl_dev->reg_base + APCC_APM_CTL_STS);
+ if ((regval & MSM_APM_CTL_STS_MASK) ==
+ MSM_APM_MX_DONE_VAL)
+ break;
+
+ udelay(1);
+ timeout--;
+ }
+
+ if (timeout == 0) {
+ ret = -ETIMEDOUT;
+ dev_err(ctrl_dev->dev, "APCC to MX APM switch timed out. APCC_APM_CTL_STS=0x%x\n",
+ regval);
+ }
+
+ /* Perform revision-specific programming steps */
+ if (ctrl_dev->version < HMSS_VERSION_1P2) {
+ /* Switch APC/CBF clocks to original source */
+ writel_relaxed(APCS_GFMUXA_DESEL_VAL,
+ ctrl_dev->apcs_csr_base + APCS_SPARE);
+ ndelay(200);
+ writel_relaxed(MSM_APM_SEC_CLK_SEL_VAL,
+ ctrl_dev->apc0_pll_ctl_addr);
+ ndelay(200);
+ writel_relaxed(MSM_APM_SEC_CLK_SEL_VAL,
+ ctrl_dev->apc1_pll_ctl_addr);
+
+ /* Complete clock source switch before SPM event sequence */
+ mb();
+
+ /* Set SPM events */
+ for (i = 0; i < SPM_EVENT_NUM; i++)
+ writel_relaxed(SPM_EVENT_SET_VAL,
+ ctrl_dev->apcs_spm_events_addr[i]);
+ }
+
+ if (!ret) {
+ ctrl_dev->supply = MSM_APM_SUPPLY_MX;
+ dev_dbg(ctrl_dev->dev, "APM supply switched to MX\n");
+ }
+
+ spin_unlock_irqrestore(&ctrl_dev->lock, flags);
+
+ return ret;
+}
+
+static int msm8996_apm_switch_to_apcc(struct msm_apm_ctrl_dev *ctrl_dev)
+{
+ int i, timeout = MSM_APM_SWITCH_TIMEOUT_US;
+ u32 regval;
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctrl_dev->lock, flags);
+
+ /* Perform revision-specific programming steps */
+ if (ctrl_dev->version < HMSS_VERSION_1P2) {
+ /* Clear SPM events */
+ for (i = 0; i < SPM_EVENT_NUM; i++)
+ writel_relaxed(SPM_EVENT_CLEAR_VAL,
+ ctrl_dev->apcs_spm_events_addr[i]);
+
+ udelay(SPM_WAKEUP_DELAY_US);
+
+ /* Switch APC/CBF to GPLL0 clock */
+ writel_relaxed(APCS_GFMUXA_SEL_VAL,
+ ctrl_dev->apcs_csr_base + APCS_SPARE);
+ ndelay(200);
+ writel_relaxed(MSM_APM_OVERRIDE_SEL_VAL,
+ ctrl_dev->apc0_pll_ctl_addr);
+ ndelay(200);
+ writel_relaxed(MSM_APM_OVERRIDE_SEL_VAL,
+ ctrl_dev->apc1_pll_ctl_addr);
+
+ /* Ensure previous writes complete before proceeding */
+ mb();
+ }
+
+ /* Switch arrays to APCC supply and wait for its completion */
+ writel_relaxed(MSM_APM_APCC_MODE_VAL, ctrl_dev->reg_base +
+ APCC_APM_MODE);
+
+ /* Ensure write above completes before delaying */
+ mb();
+
+ while (timeout > 0) {
+ regval = readl_relaxed(ctrl_dev->reg_base + APCC_APM_CTL_STS);
+ if ((regval & MSM_APM_CTL_STS_MASK) ==
+ MSM_APM_APCC_DONE_VAL)
+ break;
+
+ udelay(1);
+ timeout--;
+ }
+
+ if (timeout == 0) {
+ ret = -ETIMEDOUT;
+ dev_err(ctrl_dev->dev, "MX to APCC APM switch timed out. APCC_APM_CTL_STS=0x%x\n",
+ regval);
+ }
+
+ /* Perform revision-specific programming steps */
+ if (ctrl_dev->version < HMSS_VERSION_1P2) {
+ /* Set SPM events */
+ for (i = 0; i < SPM_EVENT_NUM; i++)
+ writel_relaxed(SPM_EVENT_SET_VAL,
+ ctrl_dev->apcs_spm_events_addr[i]);
+
+ /* Complete SPM event sequence before clock source switch */
+ mb();
+
+ /* Switch APC/CBF clocks to original source */
+ writel_relaxed(APCS_GFMUXA_DESEL_VAL,
+ ctrl_dev->apcs_csr_base + APCS_SPARE);
+ ndelay(200);
+ writel_relaxed(MSM_APM_SEC_CLK_SEL_VAL,
+ ctrl_dev->apc0_pll_ctl_addr);
+ ndelay(200);
+ writel_relaxed(MSM_APM_SEC_CLK_SEL_VAL,
+ ctrl_dev->apc1_pll_ctl_addr);
+ }
+
+ if (!ret) {
+ ctrl_dev->supply = MSM_APM_SUPPLY_APCC;
+ dev_dbg(ctrl_dev->dev, "APM supply switched to APCC\n");
+ }
+
+ spin_unlock_irqrestore(&ctrl_dev->lock, flags);
+
+ return ret;
+}
+
+/* 8953 register value definitions */
+#define MSM8953_APM_MX_MODE_VAL 0x00
+#define MSM8953_APM_APCC_MODE_VAL 0x02
+#define MSM8953_APM_MX_DONE_VAL 0x00
+#define MSM8953_APM_APCC_DONE_VAL 0x03
+
+/* 8953 register offset definitions */
+#define MSM8953_APCC_APM_MODE 0x000002a8
+#define MSM8953_APCC_APM_CTL_STS 0x000002b0
+
+/* 8953 constants */
+#define MSM8953_APM_SWITCH_TIMEOUT_US 500
+
+/* Register bit mask definitions */
+#define MSM8953_APM_CTL_STS_MASK 0x1f
+
+static int msm8953_apm_switch_to_mx(struct msm_apm_ctrl_dev *ctrl_dev)
+{
+ int timeout = MSM8953_APM_SWITCH_TIMEOUT_US;
+ u32 regval;
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctrl_dev->lock, flags);
+
+ /* Switch arrays to MX supply and wait for its completion */
+ writel_relaxed(MSM8953_APM_MX_MODE_VAL, ctrl_dev->reg_base +
+ MSM8953_APCC_APM_MODE);
+
+ /* Ensure write above completes before delaying */
+ mb();
+
+ while (timeout > 0) {
+ regval = readl_relaxed(ctrl_dev->reg_base +
+ MSM8953_APCC_APM_CTL_STS);
+ if ((regval & MSM8953_APM_CTL_STS_MASK) ==
+ MSM8953_APM_MX_DONE_VAL)
+ break;
+
+ udelay(1);
+ timeout--;
+ }
+
+ if (timeout == 0) {
+ ret = -ETIMEDOUT;
+ dev_err(ctrl_dev->dev, "APCC to MX APM switch timed out. APCC_APM_CTL_STS=0x%x\n",
+ regval);
+ } else {
+ ctrl_dev->supply = MSM_APM_SUPPLY_MX;
+ dev_dbg(ctrl_dev->dev, "APM supply switched to MX\n");
+ }
+
+ spin_unlock_irqrestore(&ctrl_dev->lock, flags);
+
+ return ret;
+}
+
+static int msm8953_apm_switch_to_apcc(struct msm_apm_ctrl_dev *ctrl_dev)
+{
+ int timeout = MSM8953_APM_SWITCH_TIMEOUT_US;
+ u32 regval;
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctrl_dev->lock, flags);
+
+ /* Switch arrays to APCC supply and wait for its completion */
+ writel_relaxed(MSM8953_APM_APCC_MODE_VAL, ctrl_dev->reg_base +
+ MSM8953_APCC_APM_MODE);
+
+ /* Ensure write above completes before delaying */
+ mb();
+
+ while (timeout > 0) {
+ regval = readl_relaxed(ctrl_dev->reg_base +
+ MSM8953_APCC_APM_CTL_STS);
+ if ((regval & MSM8953_APM_CTL_STS_MASK) ==
+ MSM8953_APM_APCC_DONE_VAL)
+ break;
+
+ udelay(1);
+ timeout--;
+ }
+
+ if (timeout == 0) {
+ ret = -ETIMEDOUT;
+ dev_err(ctrl_dev->dev, "MX to APCC APM switch timed out. APCC_APM_CTL_STS=0x%x\n",
+ regval);
+ } else {
+ ctrl_dev->supply = MSM_APM_SUPPLY_APCC;
+ dev_dbg(ctrl_dev->dev, "APM supply switched to APCC\n");
+ }
+
+ spin_unlock_irqrestore(&ctrl_dev->lock, flags);
+
+ return ret;
+}
+
+static int msm_apm_switch_to_mx(struct msm_apm_ctrl_dev *ctrl_dev)
+{
+ int ret = 0;
+
+ switch (ctrl_dev->msm_id) {
+ case MSM8996_ID:
+ ret = msm8996_apm_switch_to_mx(ctrl_dev);
+ break;
+ case MSM8953_ID:
+ case IPQ807x_ID:
+ ret = msm8953_apm_switch_to_mx(ctrl_dev);
+ break;
+ }
+
+ return ret;
+}
+
+static int msm_apm_switch_to_apcc(struct msm_apm_ctrl_dev *ctrl_dev)
+{
+ int ret = 0;
+
+ switch (ctrl_dev->msm_id) {
+ case MSM8996_ID:
+ ret = msm8996_apm_switch_to_apcc(ctrl_dev);
+ break;
+ case MSM8953_ID:
+ case IPQ807x_ID:
+ ret = msm8953_apm_switch_to_apcc(ctrl_dev);
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * msm_apm_get_supply() - Returns the supply that is currently
+ * powering the memory arrays
+ * @ctrl_dev: Pointer to an MSM APM controller device
+ *
+ * Returns the supply currently selected by the APM.
+ */
+int msm_apm_get_supply(struct msm_apm_ctrl_dev *ctrl_dev)
+{
+ return ctrl_dev->supply;
+}
+EXPORT_SYMBOL(msm_apm_get_supply);
+
+/**
+ * msm_apm_set_supply() - Perform the necessary steps to switch the voltage
+ * source of the memory arrays to a given supply
+ * @ctrl_dev: Pointer to an MSM APM controller device
+ * @supply: Power rail to use as supply for the memory
+ * arrays
+ *
+ * Returns 0 on success, -ETIMEDOUT on APM switch timeout, or -EPERM if
+ * the supply is not supported.
+ */
+int msm_apm_set_supply(struct msm_apm_ctrl_dev *ctrl_dev,
+ enum msm_apm_supply supply)
+{
+ int ret;
+
+ switch (supply) {
+ case MSM_APM_SUPPLY_APCC:
+ ret = msm_apm_switch_to_apcc(ctrl_dev);
+ break;
+ case MSM_APM_SUPPLY_MX:
+ ret = msm_apm_switch_to_mx(ctrl_dev);
+ break;
+ default:
+ ret = -EPERM;
+ break;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(msm_apm_set_supply);
+
+/**
+ * msm_apm_ctrl_dev_get() - get a handle to the MSM APM controller linked to
+ * the device in device tree
+ * @dev: Pointer to the device
+ *
+ * The device must specify "qcom,apm-ctrl" property in its device tree
+ * node which points to an MSM APM controller device node.
+ *
+ * Returns an MSM APM controller handle if successful or ERR_PTR on any error.
+ * If the APM controller device hasn't probed yet, ERR_PTR(-EPROBE_DEFER) is
+ * returned.
+ */
+struct msm_apm_ctrl_dev *msm_apm_ctrl_dev_get(struct device *dev)
+{
+ struct msm_apm_ctrl_dev *ctrl_dev = NULL;
+ struct msm_apm_ctrl_dev *dev_found = ERR_PTR(-EPROBE_DEFER);
+ struct device_node *ctrl_node;
+
+ if (!dev || !dev->of_node) {
+ pr_err("Invalid device node\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ ctrl_node = of_parse_phandle(dev->of_node, "qcom,apm-ctrl", 0);
+ if (!ctrl_node) {
+ pr_err("Could not find qcom,apm-ctrl property in %s\n",
+ dev->of_node->full_name);
+ return ERR_PTR(-ENXIO);
+ }
+
+ mutex_lock(&apm_ctrl_list_mutex);
+ list_for_each_entry(ctrl_dev, &apm_ctrl_list, list) {
+ if (ctrl_dev->dev && ctrl_dev->dev->of_node == ctrl_node) {
+ dev_found = ctrl_dev;
+ break;
+ }
+ }
+ mutex_unlock(&apm_ctrl_list_mutex);
+
+ of_node_put(ctrl_node);
+ return dev_found;
+}
+EXPORT_SYMBOL(msm_apm_ctrl_dev_get);
+
+#if defined(CONFIG_DEBUG_FS)
+
+static int apm_supply_dbg_open(struct inode *inode, struct file *filep)
+{
+ filep->private_data = inode->i_private;
+
+ return 0;
+}
+
+static ssize_t apm_supply_dbg_read(struct file *filep, char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct msm_apm_ctrl_dev *ctrl_dev = filep->private_data;
+ char buf[10];
+ int len;
+
+ if (!ctrl_dev) {
+ pr_err("invalid apm ctrl handle\n");
+ return -ENODEV;
+ }
+
+ if (ctrl_dev->supply == MSM_APM_SUPPLY_APCC)
+ len = snprintf(buf, sizeof(buf), "APCC\n");
+ else if (ctrl_dev->supply == MSM_APM_SUPPLY_MX)
+ len = snprintf(buf, sizeof(buf), "MX\n");
+ else
+ len = snprintf(buf, sizeof(buf), "ERR\n");
+
+ return simple_read_from_buffer(ubuf, count, ppos, buf, len);
+}
+
+static const struct file_operations apm_supply_fops = {
+ .open = apm_supply_dbg_open,
+ .read = apm_supply_dbg_read,
+};
+
+static void apm_debugfs_base_init(void)
+{
+ apm_debugfs_base = debugfs_create_dir("msm-apm", NULL);
+
+ if (IS_ERR_OR_NULL(apm_debugfs_base))
+ pr_err("msm-apm debugfs base directory creation failed\n");
+}
+
+static void apm_debugfs_init(struct msm_apm_ctrl_dev *ctrl_dev)
+{
+ struct dentry *temp;
+
+ if (IS_ERR_OR_NULL(apm_debugfs_base)) {
+ pr_err("Base directory missing, cannot create apm debugfs nodes\n");
+ return;
+ }
+
+ ctrl_dev->debugfs = debugfs_create_dir(dev_name(ctrl_dev->dev),
+ apm_debugfs_base);
+ if (IS_ERR_OR_NULL(ctrl_dev->debugfs)) {
+ pr_err("%s debugfs directory creation failed\n",
+ dev_name(ctrl_dev->dev));
+ return;
+ }
+
+ temp = debugfs_create_file("supply", S_IRUGO, ctrl_dev->debugfs,
+ ctrl_dev, &apm_supply_fops);
+ if (IS_ERR_OR_NULL(temp)) {
+ pr_err("supply mode creation failed\n");
+ return;
+ }
+}
+
+static void apm_debugfs_deinit(struct msm_apm_ctrl_dev *ctrl_dev)
+{
+ if (!IS_ERR_OR_NULL(ctrl_dev->debugfs))
+ debugfs_remove_recursive(ctrl_dev->debugfs);
+}
+
+static void apm_debugfs_base_remove(void)
+{
+ debugfs_remove_recursive(apm_debugfs_base);
+}
+#else
+
+static void apm_debugfs_base_init(void)
+{}
+
+static void apm_debugfs_init(struct msm_apm_ctrl_dev *ctrl_dev)
+{}
+
+static void apm_debugfs_deinit(struct msm_apm_ctrl_dev *ctrl_dev)
+{}
+
+static void apm_debugfs_base_remove(void)
+{}
+
+#endif
+
+static struct of_device_id msm_apm_match_table[] = {
+ {
+ .compatible = "qcom,msm-apm",
+ .data = (void *)(uintptr_t)MSM8996_ID,
+ },
+ {
+ .compatible = "qcom,msm8953-apm",
+ .data = (void *)(uintptr_t)MSM8953_ID,
+ },
+ {
+ .compatible = "qcom,ipq807x-apm",
+ .data = (void *)(uintptr_t)IPQ807x_ID,
+ },
+ {}
+};
+
+static int msm_apm_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct msm_apm_ctrl_dev *ctrl;
+ const struct of_device_id *match;
+ int ret = 0;
+
+ dev_dbg(dev, "probing MSM Array Power Mux driver\n");
+
+ if (!dev->of_node) {
+ dev_err(dev, "Device tree node is missing\n");
+ return -ENODEV;
+ }
+
+ match = of_match_device(msm_apm_match_table, dev);
+ if (!match)
+ return -ENODEV;
+
+ ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl) {
+ dev_err(dev, "MSM APM controller memory allocation failed\n");
+ return -ENOMEM;
+ }
+
+ INIT_LIST_HEAD(&ctrl->list);
+ spin_lock_init(&ctrl->lock);
+ ctrl->dev = dev;
+ ctrl->msm_id = (uintptr_t)match->data;
+ platform_set_drvdata(pdev, ctrl);
+
+ switch (ctrl->msm_id) {
+ case MSM8996_ID:
+ ret = msm_apm_ctrl_devm_ioremap(pdev, ctrl);
+ if (ret) {
+ dev_err(dev, "Failed to add APM controller device\n");
+ return ret;
+ }
+ break;
+ case MSM8953_ID:
+ case IPQ807x_ID:
+ ret = msm8953_apm_ctrl_init(pdev, ctrl);
+ if (ret) {
+ dev_err(dev, "Failed to initialize APM controller device: ret=%d\n",
+ ret);
+ return ret;
+ }
+ break;
+ default:
+ dev_err(dev, "unable to add APM controller device for msm_id:%d\n",
+ ctrl->msm_id);
+ return -ENODEV;
+ }
+
+ apm_debugfs_init(ctrl);
+ mutex_lock(&apm_ctrl_list_mutex);
+ list_add_tail(&ctrl->list, &apm_ctrl_list);
+ mutex_unlock(&apm_ctrl_list_mutex);
+
+ dev_dbg(dev, "MSM Array Power Mux driver probe successful");
+
+ return ret;
+}
+
+static int msm_apm_remove(struct platform_device *pdev)
+{
+ struct msm_apm_ctrl_dev *ctrl_dev;
+
+ ctrl_dev = platform_get_drvdata(pdev);
+ if (ctrl_dev) {
+ mutex_lock(&apm_ctrl_list_mutex);
+ list_del(&ctrl_dev->list);
+ mutex_unlock(&apm_ctrl_list_mutex);
+ apm_debugfs_deinit(ctrl_dev);
+ }
+
+ return 0;
+}
+
+static struct platform_driver msm_apm_driver = {
+ .driver = {
+ .name = MSM_APM_DRIVER_NAME,
+ .of_match_table = msm_apm_match_table,
+ .owner = THIS_MODULE,
+ },
+ .probe = msm_apm_probe,
+ .remove = msm_apm_remove,
+};
+
+static int __init msm_apm_init(void)
+{
+ apm_debugfs_base_init();
+ return platform_driver_register(&msm_apm_driver);
+}
+
+static void __exit msm_apm_exit(void)
+{
+ platform_driver_unregister(&msm_apm_driver);
+ apm_debugfs_base_remove();
+}
+
+arch_initcall(msm_apm_init);
+module_exit(msm_apm_exit);
+
+MODULE_DESCRIPTION("MSM Array Power Mux driver");
+MODULE_LICENSE("GPL v2");
--- /dev/null
+++ b/include/linux/power/qcom/apm.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __LINUX_POWER_QCOM_APM_H__
+#define __LINUX_POWER_QCOM_APM_H__
+
+#include <linux/device.h>
+#include <linux/err.h>
+
+/**
+ * enum msm_apm_supply - supported power rails to supply memory arrays
+ * %MSM_APM_SUPPLY_APCC: to enable selection of VDD_APCC rail as supply
+ * %MSM_APM_SUPPLY_MX: to enable selection of VDD_MX rail as supply
+ */
+enum msm_apm_supply {
+ MSM_APM_SUPPLY_APCC,
+ MSM_APM_SUPPLY_MX,
+};
+
+/* Handle used to identify an APM controller device */
+struct msm_apm_ctrl_dev;
+
+#ifdef CONFIG_QCOM_APM
+struct msm_apm_ctrl_dev *msm_apm_ctrl_dev_get(struct device *dev);
+int msm_apm_set_supply(struct msm_apm_ctrl_dev *ctrl_dev,
+ enum msm_apm_supply supply);
+int msm_apm_get_supply(struct msm_apm_ctrl_dev *ctrl_dev);
+
+#else
+static inline struct msm_apm_ctrl_dev *msm_apm_ctrl_dev_get(struct device *dev)
+{ return ERR_PTR(-EPERM); }
+static inline int msm_apm_set_supply(struct msm_apm_ctrl_dev *ctrl_dev,
+ enum msm_apm_supply supply)
+{ return -EPERM; }
+static inline int msm_apm_get_supply(struct msm_apm_ctrl_dev *ctrl_dev)
+{ return -EPERM; }
+#endif
+#endif
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