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 "board.h"
  26 #include "board-harmony.h"
  27
  28 #ifdef CONFIG_TEGRA_PCI
  29
  30 static int __init harmony_pcie_init(void)
  31 {
  32         struct regulator *regulator = NULL;
  33         int err;
  34
  35         if (!machine_is_harmony())
  36                 return 0;
  37
  38         err = gpio_request(TEGRA_GPIO_EN_VDD_1V05_GPIO, "EN_VDD_1V05");
  39         if (err)
  40                 return err;
  41
  42         gpio_direction_output(TEGRA_GPIO_EN_VDD_1V05_GPIO, 1);
  43
  44         regulator = regulator_get(NULL, "pex_clk");
  45         if (IS_ERR_OR_NULL(regulator))
  46                 goto err_reg;
  47
  48         regulator_enable(regulator);
  49
  50         err = tegra_pcie_init(true, true);
  51         if (err)
  52                 goto err_pcie;
  53
  54         return 0;
  55
  56 err_pcie:
  57         regulator_disable(regulator);
  58         regulator_put(regulator);
  59 err_reg:
  60         gpio_free(TEGRA_GPIO_EN_VDD_1V05_GPIO);
  61
  62         return err;
  63 }
  64
  65 /* PCI should be initialized after I2C, mfd and regulators */
  66 subsys_initcall_sync(harmony_pcie_init);
  67
  68 #endif