target/linux/ipq806x/patches-3.18/031-hwspinlock-qcom-Add-support-for-Qualcomm-HW-Mutex-bl.patch

   1 From 19a0f61224d2d91860fa8291ab63cb104ee86bdd Mon Sep 17 00:00:00 2001
   2 From: Bjorn Andersson <bjorn.andersson@sonymobile.com>
   3 Date: Tue, 24 Mar 2015 10:11:05 -0700
   4 Subject: [PATCH] hwspinlock: qcom: Add support for Qualcomm HW Mutex block
   5
   6 Add driver for Qualcomm Hardware Mutex block found in many Qualcomm
   7 SoCs.
   8
   9 Based on initial effort by Kumar Gala <galak@codeaurora.org>
  10
  11 Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
  12 Reviewed-by: Andy Gross <agross@codeaurora.org>
  13 Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
  14 Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
  15 ---
  16  drivers/hwspinlock/Kconfig           |  12 +++
  17  drivers/hwspinlock/Makefile          |   1 +
  18  drivers/hwspinlock/qcom_hwspinlock.c | 181 +++++++++++++++++++++++++++++++++++
  19  3 files changed, 194 insertions(+)
  20  create mode 100644 drivers/hwspinlock/qcom_hwspinlock.c
  21
  22 --- a/drivers/hwspinlock/Kconfig
  23 +++ b/drivers/hwspinlock/Kconfig
  24 @@ -18,6 +18,18 @@ config HWSPINLOCK_OMAP
  25
  26           If unsure, say N.
  27
  28 +config HWSPINLOCK_QCOM
  29 +       tristate "Qualcomm Hardware Spinlock device"
  30 +       depends on ARCH_QCOM
  31 +       select HWSPINLOCK
  32 +       select MFD_SYSCON
  33 +       help
  34 +         Say y here to support the Qualcomm Hardware Mutex functionality, which
  35 +         provides a synchronisation mechanism for the various processors on
  36 +         the SoC.
  37 +
  38 +         If unsure, say N.
  39 +
  40  config HSEM_U8500
  41         tristate "STE Hardware Semaphore functionality"
  42         depends on ARCH_U8500
  43 --- a/drivers/hwspinlock/Makefile
  44 +++ b/drivers/hwspinlock/Makefile
  45 @@ -4,4 +4,5 @@
  46
  47  obj-$(CONFIG_HWSPINLOCK)               += hwspinlock_core.o
  48  obj-$(CONFIG_HWSPINLOCK_OMAP)          += omap_hwspinlock.o
  49 +obj-$(CONFIG_HWSPINLOCK_QCOM)          += qcom_hwspinlock.o
  50  obj-$(CONFIG_HSEM_U8500)               += u8500_hsem.o
  51 --- /dev/null
  52 +++ b/drivers/hwspinlock/qcom_hwspinlock.c
  53 @@ -0,0 +1,181 @@
  54 +/*
  55 + * Copyright (c) 2013, The Linux Foundation. All rights reserved.
  56 + * Copyright (c) 2015, Sony Mobile Communications AB
  57 + *
  58 + * This software is licensed under the terms of the GNU General Public
  59 + * License version 2, as published by the Free Software Foundation, and
  60 + * may be copied, distributed, and modified under those terms.
  61 + *
  62 + * This program is distributed in the hope that it will be useful,
  63 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  64 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  65 + * GNU General Public License for more details.
  66 + */
  67 +
  68 +#include <linux/hwspinlock.h>
  69 +#include <linux/io.h>
  70 +#include <linux/kernel.h>
  71 +#include <linux/mfd/syscon.h>
  72 +#include <linux/module.h>
  73 +#include <linux/of.h>
  74 +#include <linux/of_device.h>
  75 +#include <linux/platform_device.h>
  76 +#include <linux/pm_runtime.h>
  77 +#include <linux/regmap.h>
  78 +
  79 +#include "hwspinlock_internal.h"
  80 +
  81 +#define QCOM_MUTEX_APPS_PROC_ID        1
  82 +#define QCOM_MUTEX_NUM_LOCKS   32
  83 +
  84 +static int qcom_hwspinlock_trylock(struct hwspinlock *lock)
  85 +{
  86 +       struct regmap_field *field = lock->priv;
  87 +       u32 lock_owner;
  88 +       int ret;
  89 +
  90 +       ret = regmap_field_write(field, QCOM_MUTEX_APPS_PROC_ID);
  91 +       if (ret)
  92 +               return ret;
  93 +
  94 +       ret = regmap_field_read(field, &lock_owner);
  95 +       if (ret)
  96 +               return ret;
  97 +
  98 +       return lock_owner == QCOM_MUTEX_APPS_PROC_ID;
  99 +}
 100 +
 101 +static void qcom_hwspinlock_unlock(struct hwspinlock *lock)
 102 +{
 103 +       struct regmap_field *field = lock->priv;
 104 +       u32 lock_owner;
 105 +       int ret;
 106 +
 107 +       ret = regmap_field_read(field, &lock_owner);
 108 +       if (ret) {
 109 +               pr_err("%s: unable to query spinlock owner\n", __func__);
 110 +               return;
 111 +       }
 112 +
 113 +       if (lock_owner != QCOM_MUTEX_APPS_PROC_ID) {
 114 +               pr_err("%s: spinlock not owned by us (actual owner is %d)\n",
 115 +                               __func__, lock_owner);
 116 +       }
 117 +
 118 +       ret = regmap_field_write(field, 0);
 119 +       if (ret)
 120 +               pr_err("%s: failed to unlock spinlock\n", __func__);
 121 +}
 122 +
 123 +static const struct hwspinlock_ops qcom_hwspinlock_ops = {
 124 +       .trylock        = qcom_hwspinlock_trylock,
 125 +       .unlock         = qcom_hwspinlock_unlock,
 126 +};
 127 +
 128 +static const struct of_device_id qcom_hwspinlock_of_match[] = {
 129 +       { .compatible = "qcom,sfpb-mutex" },
 130 +       { .compatible = "qcom,tcsr-mutex" },
 131 +       { }
 132 +};
 133 +MODULE_DEVICE_TABLE(of, qcom_hwspinlock_of_match);
 134 +
 135 +static int qcom_hwspinlock_probe(struct platform_device *pdev)
 136 +{
 137 +       struct hwspinlock_device *bank;
 138 +       struct device_node *syscon;
 139 +       struct reg_field field;
 140 +       struct regmap *regmap;
 141 +       size_t array_size;
 142 +       u32 stride;
 143 +       u32 base;
 144 +       int ret;
 145 +       int i;
 146 +
 147 +       syscon = of_parse_phandle(pdev->dev.of_node, "syscon", 0);
 148 +       if (!syscon) {
 149 +               dev_err(&pdev->dev, "no syscon property\n");
 150 +               return -ENODEV;
 151 +       }
 152 +
 153 +       regmap = syscon_node_to_regmap(syscon);
 154 +       if (IS_ERR(regmap))
 155 +               return PTR_ERR(regmap);
 156 +
 157 +       ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 1, &base);
 158 +       if (ret < 0) {
 159 +               dev_err(&pdev->dev, "no offset in syscon\n");
 160 +               return -EINVAL;
 161 +       }
 162 +
 163 +       ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 2, &stride);
 164 +       if (ret < 0) {
 165 +               dev_err(&pdev->dev, "no stride syscon\n");
 166 +               return -EINVAL;
 167 +       }
 168 +
 169 +       array_size = QCOM_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock);
 170 +       bank = devm_kzalloc(&pdev->dev, sizeof(*bank) + array_size, GFP_KERNEL);
 171 +       if (!bank)
 172 +               return -ENOMEM;
 173 +
 174 +       platform_set_drvdata(pdev, bank);
 175 +
 176 +       for (i = 0; i < QCOM_MUTEX_NUM_LOCKS; i++) {
 177 +               field.reg = base + i * stride;
 178 +               field.lsb = 0;
 179 +               field.msb = 32;
 180 +
 181 +               bank->lock[i].priv = devm_regmap_field_alloc(&pdev->dev,
 182 +                                                            regmap, field);
 183 +       }
 184 +
 185 +       pm_runtime_enable(&pdev->dev);
 186 +
 187 +       ret = hwspin_lock_register(bank, &pdev->dev, &qcom_hwspinlock_ops,
 188 +                                  0, QCOM_MUTEX_NUM_LOCKS);
 189 +       if (ret)
 190 +               pm_runtime_disable(&pdev->dev);
 191 +
 192 +       return ret;
 193 +}
 194 +
 195 +static int qcom_hwspinlock_remove(struct platform_device *pdev)
 196 +{
 197 +       struct hwspinlock_device *bank = platform_get_drvdata(pdev);
 198 +       int ret;
 199 +
 200 +       ret = hwspin_lock_unregister(bank);
 201 +       if (ret) {
 202 +               dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret);
 203 +               return ret;
 204 +       }
 205 +
 206 +       pm_runtime_disable(&pdev->dev);
 207 +
 208 +       return 0;
 209 +}
 210 +
 211 +static struct platform_driver qcom_hwspinlock_driver = {
 212 +       .probe          = qcom_hwspinlock_probe,
 213 +       .remove         = qcom_hwspinlock_remove,
 214 +       .driver         = {
 215 +               .name   = "qcom_hwspinlock",
 216 +               .of_match_table = qcom_hwspinlock_of_match,
 217 +       },
 218 +};
 219 +
 220 +static int __init qcom_hwspinlock_init(void)
 221 +{
 222 +       return platform_driver_register(&qcom_hwspinlock_driver);
 223 +}
 224 +/* board init code might need to reserve hwspinlocks for predefined purposes */
 225 +postcore_initcall(qcom_hwspinlock_init);
 226 +
 227 +static void __exit qcom_hwspinlock_exit(void)
 228 +{
 229 +       platform_driver_unregister(&qcom_hwspinlock_driver);
 230 +}
 231 +module_exit(qcom_hwspinlock_exit);
 232 +
 233 +MODULE_LICENSE("GPL v2");
 234 +MODULE_DESCRIPTION("Hardware spinlock driver for Qualcomm SoCs");