target/linux/ipq806x/patches/0170-clk-qcom-Add-KPSS-ACC-GCC-driver.patch

   1 From 67a9d5a02b178644da624ef9c32b4e6abb2c4f6e Mon Sep 17 00:00:00 2001
   2 From: Stephen Boyd <sboyd@codeaurora.org>
   3 Date: Wed, 18 Jun 2014 14:25:41 -0700
   4 Subject: [PATCH 170/182] 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 Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
  12 ---
  13  drivers/clk/qcom/Kconfig    |    8 +++
  14  drivers/clk/qcom/Makefile   |    1 +
  15  drivers/clk/qcom/kpss-xcc.c |  115 +++++++++++++++++++++++++++++++++++++++++++
  16  3 files changed, 124 insertions(+)
  17  create mode 100644 drivers/clk/qcom/kpss-xcc.c
  18
  19 diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
  20 index 70b6a7c..e9e5360 100644
  21 --- a/drivers/clk/qcom/Kconfig
  22 +++ b/drivers/clk/qcom/Kconfig
  23 @@ -62,6 +62,14 @@ config QCOM_HFPLL
  24           Say Y if you want to support CPU frequency scaling on devices
  25           such as MSM8974, APQ8084, etc.
  26
  27 +config KPSS_XCC
  28 +       tristate "KPSS Clock Controller"
  29 +       depends on COMMON_CLK_QCOM
  30 +       help
  31 +         Support for the Krait ACC and GCC clock controllers. Say Y
  32 +         if you want to support CPU frequency scaling on devices such
  33 +         as MSM8960, APQ8064, etc.
  34 +
  35  config KRAIT_CLOCKS
  36         bool
  37         select KRAIT_L2_ACCESSORS
  38 diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
  39 index 6482165..29b2a45 100644
  40 --- a/drivers/clk/qcom/Makefile
  41 +++ b/drivers/clk/qcom/Makefile
  42 @@ -17,4 +17,5 @@ obj-$(CONFIG_MSM_GCC_8960) += gcc-msm8960.o
  43  obj-$(CONFIG_MSM_GCC_8974) += gcc-msm8974.o
  44  obj-$(CONFIG_MSM_MMCC_8960) += mmcc-msm8960.o
  45  obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8974.o
  46 +obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
  47  obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
  48 diff --git a/drivers/clk/qcom/kpss-xcc.c b/drivers/clk/qcom/kpss-xcc.c
  49 new file mode 100644
  50 index 0000000..1061668
  51 --- /dev/null
  52 +++ b/drivers/clk/qcom/kpss-xcc.c
  53 @@ -0,0 +1,115 @@
  54 +/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
  55 + *
  56 + * This program is free software; you can redistribute it and/or modify
  57 + * it under the terms of the GNU General Public License version 2 and
  58 + * only version 2 as published by the Free Software Foundation.
  59 + *
  60 + * This program is distributed in the hope that it will be useful,
  61 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  62 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  63 + * GNU General Public License for more details.
  64 + */
  65 +
  66 +#include <linux/kernel.h>
  67 +#include <linux/init.h>
  68 +#include <linux/module.h>
  69 +#include <linux/platform_device.h>
  70 +#include <linux/err.h>
  71 +#include <linux/io.h>
  72 +#include <linux/of.h>
  73 +#include <linux/of_device.h>
  74 +#include <linux/clk.h>
  75 +#include <linux/clk-provider.h>
  76 +#include <linux/clk/msm-clk-generic.h>
  77 +
  78 +static int kpss_xcc_set_mux_sel(struct mux_clk *clk, int sel)
  79 +{
  80 +       writel_relaxed(sel, clk->base + clk->offset);
  81 +       return 0;
  82 +}
  83 +
  84 +static int kpss_xcc_get_mux_sel(struct mux_clk *clk)
  85 +{
  86 +       return readl_relaxed(clk->base + clk->offset);
  87 +}
  88 +
  89 +static const struct clk_mux_ops kpss_xcc_ops = {
  90 +       .set_mux_sel = kpss_xcc_set_mux_sel,
  91 +       .get_mux_sel = kpss_xcc_get_mux_sel,
  92 +};
  93 +
  94 +static const char *aux_parents[] = {
  95 +       "pll8_vote",
  96 +       "pxo",
  97 +};
  98 +
  99 +static u8 aux_parent_map[] = {
 100 +       3,
 101 +       0,
 102 +};
 103 +
 104 +static const struct of_device_id kpss_xcc_match_table[] = {
 105 +       { .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
 106 +       { .compatible = "qcom,kpss-gcc" },
 107 +       {}
 108 +};
 109 +MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
 110 +
 111 +static int kpss_xcc_driver_probe(struct platform_device *pdev)
 112 +{
 113 +       const struct of_device_id *id;
 114 +       struct clk *clk;
 115 +       struct resource *res;
 116 +       void __iomem *base;
 117 +       struct mux_clk *mux_clk;
 118 +       struct clk_init_data init = {
 119 +               .parent_names = aux_parents,
 120 +               .num_parents = 2,
 121 +               .ops = &clk_ops_gen_mux,
 122 +       };
 123 +
 124 +       id = of_match_device(kpss_xcc_match_table, &pdev->dev);
 125 +       if (!id)
 126 +               return -ENODEV;
 127 +
 128 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 129 +       base = devm_ioremap_resource(&pdev->dev, res);
 130 +       if (IS_ERR(base))
 131 +               return PTR_ERR(base);
 132 +
 133 +       mux_clk = devm_kzalloc(&pdev->dev, sizeof(*mux_clk), GFP_KERNEL);
 134 +       if (!mux_clk)
 135 +               return -ENOMEM;
 136 +
 137 +       mux_clk->mask = 0x3;
 138 +       mux_clk->parent_map = aux_parent_map;
 139 +       mux_clk->ops = &kpss_xcc_ops;
 140 +       mux_clk->base = base;
 141 +       mux_clk->hw.init = &init;
 142 +
 143 +       if (id->data) {
 144 +               if (of_property_read_string_index(pdev->dev.of_node,
 145 +                                       "clock-output-names", 0, &init.name))
 146 +                       return -ENODEV;
 147 +               mux_clk->offset = 0x14;
 148 +       } else {
 149 +               init.name = "acpu_l2_aux";
 150 +               mux_clk->offset = 0x28;
 151 +       }
 152 +
 153 +       clk = devm_clk_register(&pdev->dev, &mux_clk->hw);
 154 +
 155 +       return PTR_ERR_OR_ZERO(clk);
 156 +}
 157 +
 158 +static struct platform_driver kpss_xcc_driver = {
 159 +       .probe = kpss_xcc_driver_probe,
 160 +       .driver = {
 161 +               .name = "kpss-xcc",
 162 +               .of_match_table = kpss_xcc_match_table,
 163 +               .owner = THIS_MODULE,
 164 +       },
 165 +};
 166 +module_platform_driver(kpss_xcc_driver);
 167 +
 168 +MODULE_LICENSE("GPL v2");
 169 --
 170 1.7.10.4
 171