arch/arm/mach-tegra/board-harmony-pcie.c

   1 /*
   2  * arch/arm/mach-tegra/board-harmony-pcie.c
   3  *
   4  * Copyright (C) 2010 CompuLab, Ltd.
   5  * Mike Rapoport <mike@compulab.co.il>
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/gpio.h>
  20 #include <linux/err.h>
  21 #include <linux/regulator/consumer.h>
  22
  23 #include <asm/mach-types.h>
  24
  25 #include <mach/pinmux.h>
  26 #include "board.h"
  27 #include "board-harmony.h"
  28
  29 #ifdef CONFIG_TEGRA_PCI
  30
  31 static int __init harmony_pcie_init(void)
  32 {
  33         struct regulator *regulator = NULL;
  34         int err;
  35
  36         if (!machine_is_harmony())
  37                 return 0;
  38
  39         err = gpio_request(TEGRA_GPIO_EN_VDD_1V05_GPIO, "EN_VDD_1V05");
  40         if (err)
  41                 return err;
  42
  43         gpio_direction_output(TEGRA_GPIO_EN_VDD_1V05_GPIO, 1);
  44
  45         regulator = regulator_get(NULL, "pex_clk");
  46         if (IS_ERR_OR_NULL(regulator))
  47                 goto err_reg;
  48
  49         regulator_enable(regulator);
  50
  51         tegra_pinmux_set_tristate(TEGRA_PINGROUP_GPV, TEGRA_TRI_NORMAL);
  52         tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXA, TEGRA_TRI_NORMAL);
  53         tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXK, TEGRA_TRI_NORMAL);
  54
  55         err = tegra_pcie_init(true, true);
  56         if (err)
  57                 goto err_pcie;
  58
  59         return 0;
  60
  61 err_pcie:
  62         tegra_pinmux_set_tristate(TEGRA_PINGROUP_GPV, TEGRA_TRI_TRISTATE);
  63         tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXA, TEGRA_TRI_TRISTATE);
  64         tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXK, TEGRA_TRI_TRISTATE);
  65
  66         regulator_disable(regulator);
  67         regulator_put(regulator);
  68 err_reg:
  69         gpio_free(TEGRA_GPIO_EN_VDD_1V05_GPIO);
  70
  71         return err;
  72 }
  73
  74 /* PCI should be initialized after I2C, mfd and regulators */
  75 subsys_initcall_sync(harmony_pcie_init);
  76
  77 #endif