target/linux/layerscape/patches-4.4/8036-ls2085a-Add-support-for-reset.patch

   1 From 4b9227ba510562a51e87487905895aea97e17e77 Mon Sep 17 00:00:00 2001
   2 From: pankaj chauhan <pankaj.chauhan@freescale.com>
   3 Date: Tue, 3 Feb 2015 13:08:52 +0530
   4 Subject: [PATCH 36/70] ls2085a: Add support for reset
   5
   6 Add support for layerscape reset driver.
   7 Reset is implemented by raising RESET_REQ_B.
   8
   9 Signed-off-by: pankaj chauhan <pankaj.chauhan@freescale.com>
  10 Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
  11 (cherry picked from commit f248be3aea58ca32b7d77413d742996249b293e9)
  12 ---
  13  drivers/power/reset/Kconfig     |    7 ++-
  14  drivers/power/reset/Makefile    |    1 +
  15  drivers/power/reset/ls-reboot.c |   93 +++++++++++++++++++++++++++++++++++++++
  16  3 files changed, 100 insertions(+), 1 deletion(-)
  17  create mode 100644 drivers/power/reset/ls-reboot.c
  18
  19 --- a/drivers/power/reset/Kconfig
  20 +++ b/drivers/power/reset/Kconfig
  21 @@ -173,5 +173,10 @@ config POWER_RESET_ZX
  22         help
  23           Reboot support for ZTE SoCs.
  24
  25 -endif
  26 +config POWER_RESET_LAYERSCAPE
  27 +       bool "Freescale LayerScape reset driver"
  28 +       depends on ARCH_FSL_LS2085A
  29 +       help
  30 +         Reboot support for the Freescale LayerScape SoCs.
  31
  32 +endif
  33 --- a/drivers/power/reset/Makefile
  34 +++ b/drivers/power/reset/Makefile
  35 @@ -20,3 +20,4 @@ obj-$(CONFIG_POWER_RESET_SYSCON) += sysc
  36  obj-$(CONFIG_POWER_RESET_SYSCON_POWEROFF) += syscon-poweroff.o
  37  obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o
  38  obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o
  39 +obj-$(CONFIG_POWER_RESET_LAYERSCAPE) += ls-reboot.o
  40 --- /dev/null
  41 +++ b/drivers/power/reset/ls-reboot.c
  42 @@ -0,0 +1,93 @@
  43 +/*
  44 + * Freescale LayerScape reboot driver
  45 + *
  46 + * Copyright (c) 2015, Freescale Semiconductor.
  47 + * Author: Pankaj Chauhan <pankaj.chauhan@freescale.com>
  48 + *
  49 + * This program is free software; you can redistribute it and/or modify
  50 + * it under the terms of the GNU General Public License version 2 as
  51 + * published by the Free Software Foundation.
  52 + *
  53 + * This program is distributed in the hope that it will be useful,
  54 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  55 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  56 + * GNU General Public License for more details.
  57 + *
  58 + * You should have received a copy of the GNU General Public License
  59 + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  60 + */
  61 +
  62 +#include <linux/io.h>
  63 +#include <linux/of_device.h>
  64 +#include <linux/of_address.h>
  65 +#include <linux/platform_device.h>
  66 +#include <linux/stat.h>
  67 +#include <linux/slab.h>
  68 +#include <asm/system_misc.h>
  69 +
  70 +struct ls_reboot_priv {
  71 +       struct device *dev;
  72 +       u32 *rstcr;
  73 +};
  74 +
  75 +static struct ls_reboot_priv   *ls_reboot_priv;
  76 +
  77 +static void ls_reboot(enum reboot_mode reboot_mode, const char *cmd)
  78 +{
  79 +       struct ls_reboot_priv   *priv = ls_reboot_priv;
  80 +       u32 val;
  81 +       unsigned long timeout;
  82 +
  83 +       if (ls_reboot_priv) {
  84 +               val = readl(priv->rstcr);
  85 +               val |= 0x02;
  86 +               writel(val, priv->rstcr);
  87 +       }
  88 +
  89 +       timeout = jiffies + HZ;
  90 +       while (time_before(jiffies, timeout))
  91 +               cpu_relax();
  92 +
  93 +}
  94 +
  95 +static int ls_reboot_probe(struct platform_device *pdev)
  96 +{
  97 +       ls_reboot_priv = devm_kzalloc(&pdev->dev,
  98 +                               sizeof(*ls_reboot_priv), GFP_KERNEL);
  99 +       if (!ls_reboot_priv) {
 100 +               dev_err(&pdev->dev, "out of memory for context\n");
 101 +               return -ENODEV;
 102 +       }
 103 +
 104 +       ls_reboot_priv->rstcr = of_iomap(pdev->dev.of_node, 0);
 105 +       if (!ls_reboot_priv->rstcr) {
 106 +               devm_kfree(&pdev->dev, ls_reboot_priv);
 107 +               dev_err(&pdev->dev, "can not map resource\n");
 108 +               return -ENODEV;
 109 +       }
 110 +
 111 +       ls_reboot_priv->dev = &pdev->dev;
 112 +
 113 +       arm_pm_restart = ls_reboot;
 114 +
 115 +       return 0;
 116 +}
 117 +
 118 +static struct of_device_id ls_reboot_of_match[] = {
 119 +       { .compatible = "fsl,ls-reset" },
 120 +       {}
 121 +};
 122 +
 123 +static struct platform_driver ls_reboot_driver = {
 124 +       .probe = ls_reboot_probe,
 125 +       .driver = {
 126 +               .name = "ls-reset",
 127 +               .of_match_table = ls_reboot_of_match,
 128 +       },
 129 +};
 130 +
 131 +static int __init ls_reboot_init(void)
 132 +{
 133 +       return platform_driver_register(&ls_reboot_driver);
 134 +}
 135 +device_initcall(ls_reboot_init);