target/linux/ipq806x/patches-4.9/0042-clk-qcom-Add-KPSS-ACC-GCC-driver.patch

   1 From 6039eb63fabdd6871fc70940aa98102665c78eed Mon Sep 17 00:00:00 2001
   2 From: Stephen Boyd <sboyd@codeaurora.org>
   3 Date: Fri, 20 Mar 2015 23:45:29 -0700
   4 Subject: [PATCH 42/69] clk: qcom: Add KPSS ACC/GCC driver
   5
   6 The ACC and GCC regions present in KPSSv1 contain registers to
   7 control clocks and power to each Krait CPU and L2. For CPUfreq
   8 purposes probe these devices and expose a mux clock that chooses
   9 between PXO and PLL8.
  10
  11 Cc: <devicetree@vger.kernel.org>
  12 Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
  13 ---
  14  .../devicetree/bindings/arm/msm/qcom,kpss-acc.txt  |  7 ++
  15  .../devicetree/bindings/arm/msm/qcom,kpss-gcc.txt  | 28 +++++++
  16  drivers/clk/qcom/Kconfig                           |  8 ++
  17  drivers/clk/qcom/Makefile                          |  1 +
  18  drivers/clk/qcom/kpss-xcc.c                        | 95 ++++++++++++++++++++++
  19  5 files changed, 139 insertions(+)
  20  create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
  21  create mode 100644 drivers/clk/qcom/kpss-xcc.c
  22
  23 --- a/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
  24 +++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
  25 @@ -21,10 +21,17 @@ PROPERTIES
  26                     the register region. An optional second element specifies
  27                     the base address and size of the alias register region.
  28
  29 +- clock-output-names:
  30 +       Usage: optional
  31 +       Value type: <string>
  32 +       Definition: Name of the output clock. Typically acpuX_aux where X is a
  33 +                   CPU number starting at 0.
  34 +
  35  Example:
  36
  37         clock-controller@2088000 {
  38                 compatible = "qcom,kpss-acc-v2";
  39                 reg = <0x02088000 0x1000>,
  40                       <0x02008000 0x1000>;
  41 +               clock-output-names = "acpu0_aux";
  42         };
  43 --- /dev/null
  44 +++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
  45 @@ -0,0 +1,28 @@
  46 +Krait Processor Sub-system (KPSS) Global Clock Controller (GCC)
  47 +
  48 +PROPERTIES
  49 +
  50 +- compatible:
  51 +       Usage: required
  52 +       Value type: <string>
  53 +       Definition: should be one of:
  54 +                       "qcom,kpss-gcc"
  55 +
  56 +- reg:
  57 +       Usage: required
  58 +       Value type: <prop-encoded-array>
  59 +       Definition: base address and size of the register region
  60 +
  61 +- clock-output-names:
  62 +       Usage: required
  63 +       Value type: <string>
  64 +       Definition: Name of the output clock. Typically acpu_l2_aux indicating
  65 +                   an L2 cache auxiliary clock.
  66 +
  67 +Example:
  68 +
  69 +       l2cc: clock-controller@2011000 {
  70 +               compatible = "qcom,kpss-gcc";
  71 +               reg = <0x2011000 0x1000>;
  72 +               clock-output-names = "acpu_l2_aux";
  73 +       };
  74 --- a/drivers/clk/qcom/Kconfig
  75 +++ b/drivers/clk/qcom/Kconfig
  76 @@ -188,6 +188,14 @@ config QCOM_HFPLL
  77           Say Y if you want to support CPU frequency scaling on devices
  78           such as MSM8974, APQ8084, etc.
  79
  80 +config KPSS_XCC
  81 +       tristate "KPSS Clock Controller"
  82 +       depends on COMMON_CLK_QCOM
  83 +       help
  84 +         Support for the Krait ACC and GCC clock controllers. Say Y
  85 +         if you want to support CPU frequency scaling on devices such
  86 +         as MSM8960, APQ8064, etc.
  87 +
  88  config KRAIT_CLOCKS
  89         bool
  90         select KRAIT_L2_ACCESSORS
  91 --- a/drivers/clk/qcom/Makefile
  92 +++ b/drivers/clk/qcom/Makefile
  93 @@ -33,4 +33,5 @@ obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8
  94  obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o
  95  obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o
  96  obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o
  97 +obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
  98  obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
  99 --- /dev/null
 100 +++ b/drivers/clk/qcom/kpss-xcc.c
 101 @@ -0,0 +1,95 @@
 102 +/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
 103 + *
 104 + * This program is free software; you can redistribute it and/or modify
 105 + * it under the terms of the GNU General Public License version 2 and
 106 + * only version 2 as published by the Free Software Foundation.
 107 + *
 108 + * This program is distributed in the hope that it will be useful,
 109 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
 110 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 111 + * GNU General Public License for more details.
 112 + */
 113 +
 114 +#include <linux/kernel.h>
 115 +#include <linux/init.h>
 116 +#include <linux/module.h>
 117 +#include <linux/platform_device.h>
 118 +#include <linux/err.h>
 119 +#include <linux/io.h>
 120 +#include <linux/of.h>
 121 +#include <linux/of_device.h>
 122 +#include <linux/clk.h>
 123 +#include <linux/clk-provider.h>
 124 +
 125 +static const char *aux_parents[] = {
 126 +       "pll8_vote",
 127 +       "pxo",
 128 +};
 129 +
 130 +static unsigned int aux_parent_map[] = {
 131 +       3,
 132 +       0,
 133 +};
 134 +
 135 +static const struct of_device_id kpss_xcc_match_table[] = {
 136 +       { .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
 137 +       { .compatible = "qcom,kpss-gcc" },
 138 +       {}
 139 +};
 140 +MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
 141 +
 142 +static int kpss_xcc_driver_probe(struct platform_device *pdev)
 143 +{
 144 +       const struct of_device_id *id;
 145 +       struct clk *clk;
 146 +       struct resource *res;
 147 +       void __iomem *base;
 148 +       const char *name;
 149 +
 150 +       id = of_match_device(kpss_xcc_match_table, &pdev->dev);
 151 +       if (!id)
 152 +               return -ENODEV;
 153 +
 154 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 155 +       base = devm_ioremap_resource(&pdev->dev, res);
 156 +       if (IS_ERR(base))
 157 +               return PTR_ERR(base);
 158 +
 159 +       if (id->data) {
 160 +               if (of_property_read_string_index(pdev->dev.of_node,
 161 +                                       "clock-output-names", 0, &name))
 162 +                       return -ENODEV;
 163 +               base += 0x14;
 164 +       } else {
 165 +               name = "acpu_l2_aux";
 166 +               base += 0x28;
 167 +       }
 168 +
 169 +       clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
 170 +                                    ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
 171 +                                    0, aux_parent_map, NULL);
 172 +
 173 +       platform_set_drvdata(pdev, clk);
 174 +
 175 +       return PTR_ERR_OR_ZERO(clk);
 176 +}
 177 +
 178 +static int kpss_xcc_driver_remove(struct platform_device *pdev)
 179 +{
 180 +       clk_unregister_mux(platform_get_drvdata(pdev));
 181 +       return 0;
 182 +}
 183 +
 184 +static struct platform_driver kpss_xcc_driver = {
 185 +       .probe = kpss_xcc_driver_probe,
 186 +       .remove = kpss_xcc_driver_remove,
 187 +       .driver = {
 188 +               .name = "kpss-xcc",
 189 +               .of_match_table = kpss_xcc_match_table,
 190 +       },
 191 +};
 192 +module_platform_driver(kpss_xcc_driver);
 193 +
 194 +MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
 195 +MODULE_LICENSE("GPL v2");
 196 +MODULE_ALIAS("platform:kpss-xcc");