arch/arm/mach-omap2/gpmc-smc91x.c

   1 /*
   2  * linux/arch/arm/mach-omap2/gpmc-smc91x.c
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  * Contact:     Tony Lindgren
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/gpio.h>
  15 #include <linux/delay.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/io.h>
  18 #include <linux/smc91x.h>
  19
  20 #include "gpmc.h"
  21 #include "gpmc-smc91x.h"
  22
  23 #include "soc.h"
  24
  25 static struct omap_smc91x_platform_data *gpmc_cfg;
  26
  27 static struct resource gpmc_smc91x_resources[] = {
  28         [0] = {
  29                 .flags          = IORESOURCE_MEM,
  30         },
  31         [1] = {
  32                 .flags          = IORESOURCE_IRQ,
  33         },
  34 };
  35
  36 static struct smc91x_platdata gpmc_smc91x_info = {
  37         .flags  = SMC91X_USE_16BIT | SMC91X_NOWAIT | SMC91X_IO_SHIFT_0,
  38         .leda   = RPC_LED_100_10,
  39         .ledb   = RPC_LED_TX_RX,
  40 };
  41
  42 static struct platform_device gpmc_smc91x_device = {
  43         .name           = "smc91x",
  44         .id             = -1,
  45         .dev            = {
  46                 .platform_data = &gpmc_smc91x_info,
  47         },
  48         .num_resources  = ARRAY_SIZE(gpmc_smc91x_resources),
  49         .resource       = gpmc_smc91x_resources,
  50 };
  51
  52 static struct gpmc_settings smc91x_settings = {
  53         .device_width = GPMC_DEVWIDTH_16BIT,
  54 };
  55
  56 /*
  57  * Set the gpmc timings for smc91c96. The timings are taken
  58  * from the data sheet available at:
  59  * http://www.smsc.com/main/catalog/lan91c96.html
  60  * REVISIT: Level shifters can add at least to the access latency.
  61  */
  62 static int smc91c96_gpmc_retime(void)
  63 {
  64         struct gpmc_timings t;
  65         struct gpmc_device_timings dev_t;
  66         const int t3 = 10;      /* Figure 12.2 read and 12.4 write */
  67         const int t4_r = 20;    /* Figure 12.2 read */
  68         const int t4_w = 5;     /* Figure 12.4 write */
  69         const int t5 = 25;      /* Figure 12.2 read */
  70         const int t6 = 15;      /* Figure 12.2 read */
  71         const int t7 = 5;       /* Figure 12.4 write */
  72         const int t8 = 5;       /* Figure 12.4 write */
  73         const int t20 = 185;    /* Figure 12.2 read and 12.4 write */
  74
  75         /*
  76          * FIXME: Calculate the address and data bus muxed timings.
  77          * Note that at least adv_rd_off needs to be changed according
  78          * to omap3430 TRM Figure 11-11. Are the sdp boards using the
  79          * FPGA in between smc91x and omap as the timings are different
  80          * from above?
  81          */
  82         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
  83                 return 0;
  84
  85         memset(&dev_t, 0, sizeof(dev_t));
  86
  87         dev_t.t_oeasu = t3 * 1000;
  88         dev_t.t_oe = t5 * 1000;
  89         dev_t.t_cez_r = t4_r * 1000;
  90         dev_t.t_oez = t6 * 1000;
  91         dev_t.t_rd_cycle = (t20 - t3) * 1000;
  92
  93         dev_t.t_weasu = t3 * 1000;
  94         dev_t.t_wpl = t7 * 1000;
  95         dev_t.t_wph = t8 * 1000;
  96         dev_t.t_cez_w = t4_w * 1000;
  97         dev_t.t_wr_cycle = (t20 - t3) * 1000;
  98
  99         gpmc_calc_timings(&t, &smc91x_settings, &dev_t);
 100
 101         return gpmc_cs_set_timings(gpmc_cfg->cs, &t);
 102 }
 103
 104 /*
 105  * Initialize smc91x device connected to the GPMC. Note that we
 106  * assume that pin multiplexing is done in the board-*.c file,
 107  * or in the bootloader.
 108  */
 109 void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data)
 110 {
 111         unsigned long cs_mem_base;
 112         int ret;
 113
 114         gpmc_cfg = board_data;
 115
 116         if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96)
 117                 gpmc_cfg->retime = smc91c96_gpmc_retime;
 118
 119         if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
 120                 printk(KERN_ERR "Failed to request GPMC mem for smc91x\n");
 121                 return;
 122         }
 123
 124         gpmc_smc91x_resources[0].start = cs_mem_base + 0x300;
 125         gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f;
 126         gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK);
 127
 128         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
 129                 smc91x_settings.mux_add_data = GPMC_MUX_AD;
 130         if (gpmc_cfg->flags & GPMC_READ_MON)
 131                 smc91x_settings.wait_on_read = true;
 132         if (gpmc_cfg->flags & GPMC_WRITE_MON)
 133                 smc91x_settings.wait_on_write = true;
 134         if (gpmc_cfg->wait_pin)
 135                 smc91x_settings.wait_pin = gpmc_cfg->wait_pin;
 136         ret = gpmc_cs_program_settings(gpmc_cfg->cs, &smc91x_settings);
 137         if (ret < 0)
 138                 goto free1;
 139
 140         if (gpmc_cfg->retime) {
 141                 ret = gpmc_cfg->retime();
 142                 if (ret != 0)
 143                         goto free1;
 144         }
 145
 146         if (gpio_request_one(gpmc_cfg->gpio_irq, GPIOF_IN, "SMC91X irq") < 0)
 147                 goto free1;
 148
 149         gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);
 150
 151         if (gpmc_cfg->gpio_pwrdwn) {
 152                 ret = gpio_request_one(gpmc_cfg->gpio_pwrdwn,
 153                                        GPIOF_OUT_INIT_LOW, "SMC91X powerdown");
 154                 if (ret)
 155                         goto free2;
 156         }
 157
 158         if (gpmc_cfg->gpio_reset) {
 159                 ret = gpio_request_one(gpmc_cfg->gpio_reset,
 160                                        GPIOF_OUT_INIT_LOW, "SMC91X reset");
 161                 if (ret)
 162                         goto free3;
 163
 164                 gpio_set_value(gpmc_cfg->gpio_reset, 1);
 165                 msleep(100);
 166                 gpio_set_value(gpmc_cfg->gpio_reset, 0);
 167         }
 168
 169         if (platform_device_register(&gpmc_smc91x_device) < 0) {
 170                 printk(KERN_ERR "Unable to register smc91x device\n");
 171                 gpio_free(gpmc_cfg->gpio_reset);
 172                 goto free3;
 173         }
 174
 175         return;
 176
 177 free3:
 178         if (gpmc_cfg->gpio_pwrdwn)
 179                 gpio_free(gpmc_cfg->gpio_pwrdwn);
 180 free2:
 181         gpio_free(gpmc_cfg->gpio_irq);
 182 free1:
 183         gpmc_cs_free(gpmc_cfg->cs);
 184
 185         printk(KERN_ERR "Could not initialize smc91x\n");
 186 }