21802f22f0
accidentially removed the files in the v4.4 commit Signed-off-by: John Crispin <john@phrozen.org>
234 lines
6.3 KiB
Diff
234 lines
6.3 KiB
Diff
From 19a0f61224d2d91860fa8291ab63cb104ee86bdd Mon Sep 17 00:00:00 2001
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From: Bjorn Andersson <bjorn.andersson@sonymobile.com>
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Date: Tue, 24 Mar 2015 10:11:05 -0700
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Subject: [PATCH] hwspinlock: qcom: Add support for Qualcomm HW Mutex block
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Add driver for Qualcomm Hardware Mutex block found in many Qualcomm
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SoCs.
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Based on initial effort by Kumar Gala <galak@codeaurora.org>
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Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
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Reviewed-by: Andy Gross <agross@codeaurora.org>
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Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
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Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
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---
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drivers/hwspinlock/Kconfig | 12 +++
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drivers/hwspinlock/Makefile | 1 +
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drivers/hwspinlock/qcom_hwspinlock.c | 181 +++++++++++++++++++++++++++++++++++
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3 files changed, 194 insertions(+)
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create mode 100644 drivers/hwspinlock/qcom_hwspinlock.c
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--- a/drivers/hwspinlock/Kconfig
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+++ b/drivers/hwspinlock/Kconfig
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@@ -18,6 +18,18 @@ config HWSPINLOCK_OMAP
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If unsure, say N.
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+config HWSPINLOCK_QCOM
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+ tristate "Qualcomm Hardware Spinlock device"
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+ depends on ARCH_QCOM
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+ select HWSPINLOCK
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+ select MFD_SYSCON
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+ help
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+ Say y here to support the Qualcomm Hardware Mutex functionality, which
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+ provides a synchronisation mechanism for the various processors on
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+ the SoC.
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+
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+ If unsure, say N.
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+
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config HSEM_U8500
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tristate "STE Hardware Semaphore functionality"
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depends on ARCH_U8500
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--- a/drivers/hwspinlock/Makefile
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+++ b/drivers/hwspinlock/Makefile
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@@ -4,4 +4,5 @@
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obj-$(CONFIG_HWSPINLOCK) += hwspinlock_core.o
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obj-$(CONFIG_HWSPINLOCK_OMAP) += omap_hwspinlock.o
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+obj-$(CONFIG_HWSPINLOCK_QCOM) += qcom_hwspinlock.o
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obj-$(CONFIG_HSEM_U8500) += u8500_hsem.o
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--- /dev/null
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+++ b/drivers/hwspinlock/qcom_hwspinlock.c
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@@ -0,0 +1,181 @@
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+/*
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+ * Copyright (c) 2013, The Linux Foundation. All rights reserved.
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+ * Copyright (c) 2015, Sony Mobile Communications AB
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/hwspinlock.h>
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+#include <linux/io.h>
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+#include <linux/kernel.h>
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+#include <linux/mfd/syscon.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/of_device.h>
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+#include <linux/platform_device.h>
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+#include <linux/pm_runtime.h>
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+#include <linux/regmap.h>
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+
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+#include "hwspinlock_internal.h"
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+
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+#define QCOM_MUTEX_APPS_PROC_ID 1
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+#define QCOM_MUTEX_NUM_LOCKS 32
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+
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+static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
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+{
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+ struct regmap_field *field = lock->priv;
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+ u32 lock_owner;
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+ int ret;
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+
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+ ret = regmap_field_write(field, QCOM_MUTEX_APPS_PROC_ID);
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+ if (ret)
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+ return ret;
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+
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+ ret = regmap_field_read(field, &lock_owner);
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+ if (ret)
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+ return ret;
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+
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+ return lock_owner == QCOM_MUTEX_APPS_PROC_ID;
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+}
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+
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+static void qcom_hwspinlock_unlock(struct hwspinlock *lock)
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+{
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+ struct regmap_field *field = lock->priv;
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+ u32 lock_owner;
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+ int ret;
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+
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+ ret = regmap_field_read(field, &lock_owner);
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+ if (ret) {
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+ pr_err("%s: unable to query spinlock owner\n", __func__);
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+ return;
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+ }
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+
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+ if (lock_owner != QCOM_MUTEX_APPS_PROC_ID) {
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+ pr_err("%s: spinlock not owned by us (actual owner is %d)\n",
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+ __func__, lock_owner);
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+ }
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+
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+ ret = regmap_field_write(field, 0);
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+ if (ret)
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+ pr_err("%s: failed to unlock spinlock\n", __func__);
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+}
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+
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+static const struct hwspinlock_ops qcom_hwspinlock_ops = {
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+ .trylock = qcom_hwspinlock_trylock,
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+ .unlock = qcom_hwspinlock_unlock,
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+};
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+
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+static const struct of_device_id qcom_hwspinlock_of_match[] = {
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+ { .compatible = "qcom,sfpb-mutex" },
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+ { .compatible = "qcom,tcsr-mutex" },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(of, qcom_hwspinlock_of_match);
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+
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+static int qcom_hwspinlock_probe(struct platform_device *pdev)
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+{
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+ struct hwspinlock_device *bank;
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+ struct device_node *syscon;
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+ struct reg_field field;
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+ struct regmap *regmap;
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+ size_t array_size;
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+ u32 stride;
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+ u32 base;
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+ int ret;
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+ int i;
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+
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+ syscon = of_parse_phandle(pdev->dev.of_node, "syscon", 0);
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+ if (!syscon) {
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+ dev_err(&pdev->dev, "no syscon property\n");
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+ return -ENODEV;
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+ }
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+
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+ regmap = syscon_node_to_regmap(syscon);
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+ if (IS_ERR(regmap))
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+ return PTR_ERR(regmap);
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+
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+ ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 1, &base);
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+ if (ret < 0) {
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+ dev_err(&pdev->dev, "no offset in syscon\n");
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+ return -EINVAL;
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+ }
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+
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+ ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 2, &stride);
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+ if (ret < 0) {
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+ dev_err(&pdev->dev, "no stride syscon\n");
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+ return -EINVAL;
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+ }
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+
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+ array_size = QCOM_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);
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+ bank = devm_kzalloc(&pdev->dev, sizeof(*bank) + array_size, GFP_KERNEL);
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+ if (!bank)
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+ return -ENOMEM;
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+
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+ platform_set_drvdata(pdev, bank);
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+
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+ for (i = 0; i < QCOM_MUTEX_NUM_LOCKS; i++) {
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+ field.reg = base + i * stride;
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+ field.lsb = 0;
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+ field.msb = 32;
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+
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+ bank->lock[i].priv = devm_regmap_field_alloc(&pdev->dev,
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+ regmap, field);
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+ }
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+
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+ pm_runtime_enable(&pdev->dev);
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+
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+ ret = hwspin_lock_register(bank, &pdev->dev, &qcom_hwspinlock_ops,
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+ 0, QCOM_MUTEX_NUM_LOCKS);
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+ if (ret)
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+ pm_runtime_disable(&pdev->dev);
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+
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+ return ret;
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+}
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+
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+static int qcom_hwspinlock_remove(struct platform_device *pdev)
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+{
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+ struct hwspinlock_device *bank = platform_get_drvdata(pdev);
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+ int ret;
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+
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+ ret = hwspin_lock_unregister(bank);
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+ if (ret) {
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+ dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ pm_runtime_disable(&pdev->dev);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver qcom_hwspinlock_driver = {
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+ .probe = qcom_hwspinlock_probe,
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+ .remove = qcom_hwspinlock_remove,
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+ .driver = {
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+ .name = "qcom_hwspinlock",
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+ .of_match_table = qcom_hwspinlock_of_match,
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+ },
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+};
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+
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+static int __init qcom_hwspinlock_init(void)
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+{
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+ return platform_driver_register(&qcom_hwspinlock_driver);
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+}
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+/* board init code might need to reserve hwspinlocks for predefined purposes */
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+postcore_initcall(qcom_hwspinlock_init);
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+
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+static void __exit qcom_hwspinlock_exit(void)
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+{
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+ platform_driver_unregister(&qcom_hwspinlock_driver);
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+}
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+module_exit(qcom_hwspinlock_exit);
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+
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+MODULE_LICENSE("GPL v2");
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+MODULE_DESCRIPTION("Hardware spinlock driver for Qualcomm SoCs");
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