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
  28 #ifdef CONFIG_TEGRA_PCI
  29
  30 /* GPIO 3 of the PMIC */
  31 #define EN_VDD_1V05_GPIO        (TEGRA_NR_GPIOS + 2)
  32
  33 static int __init harmony_pcie_init(void)
  34 {
  35         struct regulator *regulator = NULL;
  36         int err;
  37
  38         if (!machine_is_harmony())
  39                 return 0;
  40
  41         err = gpio_request(EN_VDD_1V05_GPIO, "EN_VDD_1V05");
  42         if (err)
  43                 return err;
  44
  45         gpio_direction_output(EN_VDD_1V05_GPIO, 1);
  46
  47         regulator = regulator_get(NULL, "pex_clk");
  48         if (IS_ERR_OR_NULL(regulator))
  49                 goto err_reg;
  50
  51         regulator_enable(regulator);
  52
  53         tegra_pinmux_set_tristate(TEGRA_PINGROUP_GPV, TEGRA_TRI_NORMAL);
  54         tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXA, TEGRA_TRI_NORMAL);
  55         tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXK, TEGRA_TRI_NORMAL);
  56
  57         err = tegra_pcie_init(true, true);
  58         if (err)
  59                 goto err_pcie;
  60
  61         return 0;
  62
  63 err_pcie:
  64         tegra_pinmux_set_tristate(TEGRA_PINGROUP_GPV, TEGRA_TRI_TRISTATE);
  65         tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXA, TEGRA_TRI_TRISTATE);
  66         tegra_pinmux_set_tristate(TEGRA_PINGROUP_SLXK, TEGRA_TRI_TRISTATE);
  67
  68         regulator_disable(regulator);
  69         regulator_put(regulator);
  70 err_reg:
  71         gpio_free(EN_VDD_1V05_GPIO);
  72
  73         return err;
  74 }
  75
  76 /* PCI should be initialized after I2C, mfd and regulators */
  77 subsys_initcall_sync(harmony_pcie_init);
  78
  79 #endif