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/of_gpio.h>
  22 #include <linux/regulator/consumer.h>
  23
  24 #include <asm/mach-types.h>
  25
  26 #include "board.h"
  27
  28 #ifdef CONFIG_TEGRA_PCI
  29
  30 int __init harmony_pcie_init(void)
  31 {
  32         struct device_node *np;
  33         int en_vdd_1v05;
  34         struct regulator *regulator = NULL;
  35         int err;
  36
  37         np = of_find_node_by_path("/regulators/regulator@3");
  38         if (!np) {
  39                 pr_err("%s: of_find_node_by_path failed\n", __func__);
  40                 return -ENODEV;
  41         }
  42
  43         en_vdd_1v05 = of_get_named_gpio(np, "gpio", 0);
  44         if (en_vdd_1v05 < 0) {
  45                 pr_err("%s: of_get_named_gpio failed: %d\n", __func__,
  46                        en_vdd_1v05);
  47                 return en_vdd_1v05;
  48         }
  49
  50         err = gpio_request(en_vdd_1v05, "EN_VDD_1V05");
  51         if (err) {
  52                 pr_err("%s: gpio_request failed: %d\n", __func__, err);
  53                 return err;
  54         }
  55
  56         gpio_direction_output(en_vdd_1v05, 1);
  57
  58         regulator = regulator_get(NULL, "vdd_ldo0,vddio_pex_clk");
  59         if (IS_ERR_OR_NULL(regulator)) {
  60                 pr_err("%s: regulator_get failed: %d\n", __func__,
  61                        (int)PTR_ERR(regulator));
  62                 goto err_reg;
  63         }
  64
  65         regulator_enable(regulator);
  66
  67         err = tegra_pcie_init(true, true);
  68         if (err) {
  69                 pr_err("%s: tegra_pcie_init failed: %d\n", __func__, err);
  70                 goto err_pcie;
  71         }
  72
  73         return 0;
  74
  75 err_pcie:
  76         regulator_disable(regulator);
  77         regulator_put(regulator);
  78 err_reg:
  79         gpio_free(en_vdd_1v05);
  80
  81         return err;
  82 }
  83
  84 #endif