target/linux/ipq806x/patches/0084-soc-qcom-Add-GSBI-driver.patch

   1 From a2f0fc20ea49e5dbbdbb21444683ea760fbdd38f Mon Sep 17 00:00:00 2001
   2 From: Andy Gross <agross@codeaurora.org>
   3 Date: Thu, 24 Apr 2014 11:31:21 -0500
   4 Subject: [PATCH 084/182] soc: qcom: Add GSBI driver
   5
   6 The GSBI (General Serial Bus Interface) driver controls the overarching
   7 configuration of the shared serial bus infrastructure on APQ8064, IPQ8064, and
   8 earlier QCOM processors.  The GSBI supports UART, I2C, SPI, and UIM
   9 functionality in various combinations.
  10
  11 Signed-off-by: Andy Gross <agross@codeaurora.org>
  12 Signed-off-by: Kumar Gala <galak@codeaurora.org>
  13 ---
  14  drivers/soc/Kconfig          |    2 +
  15  drivers/soc/Makefile         |    5 +++
  16  drivers/soc/qcom/Kconfig     |   11 ++++++
  17  drivers/soc/qcom/Makefile    |    1 +
  18  drivers/soc/qcom/qcom_gsbi.c |   84 ++++++++++++++++++++++++++++++++++++++++++
  19  5 files changed, 103 insertions(+)
  20  create mode 100644 drivers/soc/Makefile
  21  create mode 100644 drivers/soc/qcom/Kconfig
  22  create mode 100644 drivers/soc/qcom/Makefile
  23  create mode 100644 drivers/soc/qcom/qcom_gsbi.c
  24
  25 diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
  26 index 339baa8..c854385 100644
  27 --- a/drivers/soc/Kconfig
  28 +++ b/drivers/soc/Kconfig
  29 @@ -1,3 +1,5 @@
  30  menu "SOC (System On Chip) specific Drivers"
  31
  32 +source "drivers/soc/qcom/Kconfig"
  33 +
  34  endmenu
  35 diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
  36 new file mode 100644
  37 index 0000000..0f7c447
  38 --- /dev/null
  39 +++ b/drivers/soc/Makefile
  40 @@ -0,0 +1,5 @@
  41 +#
  42 +# Makefile for the Linux Kernel SOC specific device drivers.
  43 +#
  44 +
  45 +obj-$(CONFIG_ARCH_QCOM)                += qcom/
  46 diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
  47 new file mode 100644
  48 index 0000000..7bd2c94
  49 --- /dev/null
  50 +++ b/drivers/soc/qcom/Kconfig
  51 @@ -0,0 +1,11 @@
  52 +#
  53 +# QCOM Soc drivers
  54 +#
  55 +config QCOM_GSBI
  56 +        tristate "QCOM General Serial Bus Interface"
  57 +        depends on ARCH_QCOM
  58 +        help
  59 +          Say y here to enable GSBI support.  The GSBI provides control
  60 +          functions for connecting the underlying serial UART, SPI, and I2C
  61 +          devices to the output pins.
  62 +
  63 diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
  64 new file mode 100644
  65 index 0000000..4389012
  66 --- /dev/null
  67 +++ b/drivers/soc/qcom/Makefile
  68 @@ -0,0 +1 @@
  69 +obj-$(CONFIG_QCOM_GSBI)        +=      qcom_gsbi.o
  70 diff --git a/drivers/soc/qcom/qcom_gsbi.c b/drivers/soc/qcom/qcom_gsbi.c
  71 new file mode 100644
  72 index 0000000..061dd06
  73 --- /dev/null
  74 +++ b/drivers/soc/qcom/qcom_gsbi.c
  75 @@ -0,0 +1,84 @@
  76 +/*
  77 + * Copyright (c) 2014, The Linux foundation. All rights reserved.
  78 + *
  79 + * This program is free software; you can redistribute it and/or modify
  80 + * it under the terms of the GNU General Public License rev 2 and
  81 + * only rev 2 as published by the free Software foundation.
  82 + *
  83 + * This program is distributed in the hope that it will be useful,
  84 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  85 + * MERCHANTABILITY or fITNESS fOR A PARTICULAR PURPOSE.  See the
  86 + * GNU General Public License for more details.
  87 + */
  88 +
  89 +#include <linux/clk.h>
  90 +#include <linux/err.h>
  91 +#include <linux/io.h>
  92 +#include <linux/module.h>
  93 +#include <linux/of.h>
  94 +#include <linux/of_platform.h>
  95 +#include <linux/platform_device.h>
  96 +
  97 +#define GSBI_CTRL_REG          0x0000
  98 +#define GSBI_PROTOCOL_SHIFT    4
  99 +
 100 +static int gsbi_probe(struct platform_device *pdev)
 101 +{
 102 +       struct device_node *node = pdev->dev.of_node;
 103 +       struct resource *res;
 104 +       void __iomem *base;
 105 +       struct clk *hclk;
 106 +       u32 mode, crci = 0;
 107 +
 108 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 109 +       base = devm_ioremap_resource(&pdev->dev, res);
 110 +       if (IS_ERR(base))
 111 +               return PTR_ERR(base);
 112 +
 113 +       if (of_property_read_u32(node, "qcom,mode", &mode)) {
 114 +               dev_err(&pdev->dev, "missing mode configuration\n");
 115 +               return -EINVAL;
 116 +       }
 117 +
 118 +       /* not required, so default to 0 if not present */
 119 +       of_property_read_u32(node, "qcom,crci", &crci);
 120 +
 121 +       dev_info(&pdev->dev, "GSBI port protocol: %d crci: %d\n", mode, crci);
 122 +
 123 +       hclk = devm_clk_get(&pdev->dev, "iface");
 124 +       if (IS_ERR(hclk))
 125 +               return PTR_ERR(hclk);
 126 +
 127 +       clk_prepare_enable(hclk);
 128 +
 129 +       writel_relaxed((mode << GSBI_PROTOCOL_SHIFT) | crci,
 130 +                               base + GSBI_CTRL_REG);
 131 +
 132 +       /* make sure the gsbi control write is not reordered */
 133 +       wmb();
 134 +
 135 +       clk_disable_unprepare(hclk);
 136 +
 137 +       return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
 138 +}
 139 +
 140 +static const struct of_device_id gsbi_dt_match[] = {
 141 +       { .compatible = "qcom,gsbi-v1.0.0", },
 142 +};
 143 +
 144 +MODULE_DEVICE_TABLE(of, gsbi_dt_match);
 145 +
 146 +static struct platform_driver gsbi_driver = {
 147 +       .driver = {
 148 +               .name           = "gsbi",
 149 +               .owner          = THIS_MODULE,
 150 +               .of_match_table = gsbi_dt_match,
 151 +       },
 152 +       .probe = gsbi_probe,
 153 +};
 154 +
 155 +module_platform_driver(gsbi_driver);
 156 +
 157 +MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
 158 +MODULE_DESCRIPTION("QCOM GSBI driver");
 159 +MODULE_LICENSE("GPL v2");
 160 --
 161 1.7.10.4
 162