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 /*
  53  * Set the gpmc timings for smc91c96. The timings are taken
  54  * from the data sheet available at:
  55  * http://www.smsc.com/main/catalog/lan91c96.html
  56  * REVISIT: Level shifters can add at least to the access latency.
  57  */
  58 static int smc91c96_gpmc_retime(void)
  59 {
  60         struct gpmc_timings t;
  61         struct gpmc_device_timings dev_t;
  62         const int t3 = 10;      /* Figure 12.2 read and 12.4 write */
  63         const int t4_r = 20;    /* Figure 12.2 read */
  64         const int t4_w = 5;     /* Figure 12.4 write */
  65         const int t5 = 25;      /* Figure 12.2 read */
  66         const int t6 = 15;      /* Figure 12.2 read */
  67         const int t7 = 5;       /* Figure 12.4 write */
  68         const int t8 = 5;       /* Figure 12.4 write */
  69         const int t20 = 185;    /* Figure 12.2 read and 12.4 write */
  70         u32 l;
  71
  72         l = GPMC_CONFIG1_DEVICESIZE_16;
  73         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
  74                 l |= GPMC_CONFIG1_MUXADDDATA;
  75         if (gpmc_cfg->flags & GPMC_READ_MON)
  76                 l |= GPMC_CONFIG1_WAIT_READ_MON;
  77         if (gpmc_cfg->flags & GPMC_WRITE_MON)
  78                 l |= GPMC_CONFIG1_WAIT_WRITE_MON;
  79         if (gpmc_cfg->wait_pin)
  80                 l |= GPMC_CONFIG1_WAIT_PIN_SEL(gpmc_cfg->wait_pin);
  81         gpmc_cs_write_reg(gpmc_cfg->cs, GPMC_CS_CONFIG1, l);
  82
  83         /*
  84          * FIXME: Calculate the address and data bus muxed timings.
  85          * Note that at least adv_rd_off needs to be changed according
  86          * to omap3430 TRM Figure 11-11. Are the sdp boards using the
  87          * FPGA in between smc91x and omap as the timings are different
  88          * from above?
  89          */
  90         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
  91                 return 0;
  92
  93         memset(&dev_t, 0, sizeof(dev_t));
  94
  95         dev_t.t_oeasu = t3 * 1000;
  96         dev_t.t_oe = t5 * 1000;
  97         dev_t.t_cez_r = t4_r * 1000;
  98         dev_t.t_oez = t6 * 1000;
  99         dev_t.t_rd_cycle = (t20 - t3) * 1000;
 100
 101         dev_t.t_weasu = t3 * 1000;
 102         dev_t.t_wpl = t7 * 1000;
 103         dev_t.t_wph = t8 * 1000;
 104         dev_t.t_cez_w = t4_w * 1000;
 105         dev_t.t_wr_cycle = (t20 - t3) * 1000;
 106
 107         gpmc_calc_timings(&t, &dev_t);
 108
 109         return gpmc_cs_set_timings(gpmc_cfg->cs, &t);
 110 }
 111
 112 /*
 113  * Initialize smc91x device connected to the GPMC. Note that we
 114  * assume that pin multiplexing is done in the board-*.c file,
 115  * or in the bootloader.
 116  */
 117 void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data)
 118 {
 119         unsigned long cs_mem_base;
 120         int ret;
 121
 122         gpmc_cfg = board_data;
 123
 124         if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96)
 125                 gpmc_cfg->retime = smc91c96_gpmc_retime;
 126
 127         if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
 128                 printk(KERN_ERR "Failed to request GPMC mem for smc91x\n");
 129                 return;
 130         }
 131
 132         gpmc_smc91x_resources[0].start = cs_mem_base + 0x300;
 133         gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f;
 134         gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK);
 135
 136         if (gpmc_cfg->retime) {
 137                 ret = gpmc_cfg->retime();
 138                 if (ret != 0)
 139                         goto free1;
 140         }
 141
 142         if (gpio_request_one(gpmc_cfg->gpio_irq, GPIOF_IN, "SMC91X irq") < 0)
 143                 goto free1;
 144
 145         gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);
 146
 147         if (gpmc_cfg->gpio_pwrdwn) {
 148                 ret = gpio_request_one(gpmc_cfg->gpio_pwrdwn,
 149                                        GPIOF_OUT_INIT_LOW, "SMC91X powerdown");
 150                 if (ret)
 151                         goto free2;
 152         }
 153
 154         if (gpmc_cfg->gpio_reset) {
 155                 ret = gpio_request_one(gpmc_cfg->gpio_reset,
 156                                        GPIOF_OUT_INIT_LOW, "SMC91X reset");
 157                 if (ret)
 158                         goto free3;
 159
 160                 gpio_set_value(gpmc_cfg->gpio_reset, 1);
 161                 msleep(100);
 162                 gpio_set_value(gpmc_cfg->gpio_reset, 0);
 163         }
 164
 165         if (platform_device_register(&gpmc_smc91x_device) < 0) {
 166                 printk(KERN_ERR "Unable to register smc91x device\n");
 167                 gpio_free(gpmc_cfg->gpio_reset);
 168                 goto free3;
 169         }
 170
 171         return;
 172
 173 free3:
 174         if (gpmc_cfg->gpio_pwrdwn)
 175                 gpio_free(gpmc_cfg->gpio_pwrdwn);
 176 free2:
 177         gpio_free(gpmc_cfg->gpio_irq);
 178 free1:
 179         gpmc_cs_free(gpmc_cfg->cs);
 180
 181         printk(KERN_ERR "Could not initialize smc91x\n");
 182 }