arch/arm/mach-omap2/gpmc-smsc911x.c

   1 /*
   2  * linux/arch/arm/mach-omap2/gpmc-smsc911x.c
   3  *
   4  * Copyright (C) 2009 Li-Pro.Net
   5  * Stephan Linz <linz@li-pro.net>
   6  *
   7  * Modified from linux/arch/arm/mach-omap2/gpmc-smc91x.c
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #define pr_fmt(fmt) "%s: " fmt, __func__
  14
  15 #include <linux/kernel.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/gpio.h>
  18 #include <linux/delay.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/io.h>
  21 #include <linux/smsc911x.h>
  22
  23 #include "gpmc.h"
  24 #include "gpmc-smsc911x.h"
  25
  26 static struct resource gpmc_smsc911x_resources[] = {
  27         [0] = {
  28                 .flags          = IORESOURCE_MEM,
  29         },
  30         [1] = {
  31                 .flags          = IORESOURCE_IRQ | IORESOURCE_IRQ_LOWLEVEL,
  32         },
  33 };
  34
  35 static struct smsc911x_platform_config gpmc_smsc911x_config = {
  36         .phy_interface  = PHY_INTERFACE_MODE_MII,
  37         .irq_polarity   = SMSC911X_IRQ_POLARITY_ACTIVE_LOW,
  38         .irq_type       = SMSC911X_IRQ_TYPE_OPEN_DRAIN,
  39 };
  40
  41 /*
  42  * Initialize smsc911x device connected to the GPMC. Note that we
  43  * assume that pin multiplexing is done in the board-*.c file,
  44  * or in the bootloader.
  45  */
  46 void __init gpmc_smsc911x_init(struct omap_smsc911x_platform_data *gpmc_cfg)
  47 {
  48         struct platform_device *pdev;
  49         unsigned long cs_mem_base;
  50         int ret;
  51
  52         if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
  53                 pr_err("Failed to request GPMC mem region\n");
  54                 return;
  55         }
  56
  57         gpmc_smsc911x_resources[0].start = cs_mem_base + 0x0;
  58         gpmc_smsc911x_resources[0].end = cs_mem_base + 0xff;
  59
  60         if (gpio_request_one(gpmc_cfg->gpio_irq, GPIOF_IN, "smsc911x irq")) {
  61                 pr_err("Failed to request IRQ GPIO%d\n", gpmc_cfg->gpio_irq);
  62                 goto free1;
  63         }
  64
  65         gpmc_smsc911x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);
  66
  67         if (gpio_is_valid(gpmc_cfg->gpio_reset)) {
  68                 ret = gpio_request_one(gpmc_cfg->gpio_reset,
  69                                        GPIOF_OUT_INIT_HIGH, "smsc911x reset");
  70                 if (ret) {
  71                         pr_err("Failed to request reset GPIO%d\n",
  72                                gpmc_cfg->gpio_reset);
  73                         goto free2;
  74                 }
  75
  76                 gpio_set_value(gpmc_cfg->gpio_reset, 0);
  77                 msleep(100);
  78                 gpio_set_value(gpmc_cfg->gpio_reset, 1);
  79         }
  80
  81         gpmc_smsc911x_config.flags = gpmc_cfg->flags ? : SMSC911X_USE_16BIT;
  82
  83         pdev = platform_device_register_resndata(NULL, "smsc911x", gpmc_cfg->id,
  84                  gpmc_smsc911x_resources, ARRAY_SIZE(gpmc_smsc911x_resources),
  85                  &gpmc_smsc911x_config, sizeof(gpmc_smsc911x_config));
  86         if (!pdev) {
  87                 pr_err("Unable to register platform device\n");
  88                 gpio_free(gpmc_cfg->gpio_reset);
  89                 goto free2;
  90         }
  91
  92         return;
  93
  94 free2:
  95         gpio_free(gpmc_cfg->gpio_irq);
  96 free1:
  97         gpmc_cs_free(gpmc_cfg->cs);
  98
  99         pr_err("Could not initialize smsc911x device\n");
 100 }