release/src-rt-6.x.4708/linux/linux-2.6.36/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 <plat/board.h>
  21 #include <plat/gpmc.h>
  22 #include <plat/gpmc-smc91x.h>
  23
  24 static struct omap_smc91x_platform_data *gpmc_cfg;
  25
  26 static struct resource gpmc_smc91x_resources[] = {
  27         [0] = {
  28                 .flags          = IORESOURCE_MEM,
  29         },
  30         [1] = {
  31                 .flags          = IORESOURCE_IRQ,
  32         },
  33 };
  34
  35 static struct smc91x_platdata gpmc_smc91x_info = {
  36         .flags  = SMC91X_USE_16BIT | SMC91X_NOWAIT | SMC91X_IO_SHIFT_0,
  37         .leda   = RPC_LED_100_10,
  38         .ledb   = RPC_LED_TX_RX,
  39 };
  40
  41 static struct platform_device gpmc_smc91x_device = {
  42         .name           = "smc91x",
  43         .id             = -1,
  44         .dev            = {
  45                 .platform_data = &gpmc_smc91x_info,
  46         },
  47         .num_resources  = ARRAY_SIZE(gpmc_smc91x_resources),
  48         .resource       = gpmc_smc91x_resources,
  49 };
  50
  51 /*
  52  * Set the gpmc timings for smc91c96. The timings are taken
  53  * from the data sheet available at:
  54  * http://www.smsc.com/main/catalog/lan91c96.html
  55  * REVISIT: Level shifters can add at least to the access latency.
  56  */
  57 static int smc91c96_gpmc_retime(void)
  58 {
  59         struct gpmc_timings t;
  60         const int t3 = 10;      /* Figure 12.2 read and 12.4 write */
  61         const int t4_r = 20;    /* Figure 12.2 read */
  62         const int t4_w = 5;     /* Figure 12.4 write */
  63         const int t5 = 25;      /* Figure 12.2 read */
  64         const int t6 = 15;      /* Figure 12.2 read */
  65         const int t7 = 5;       /* Figure 12.4 write */
  66         const int t8 = 5;       /* Figure 12.4 write */
  67         const int t20 = 185;    /* Figure 12.2 read and 12.4 write */
  68         u32 l;
  69
  70         memset(&t, 0, sizeof(t));
  71
  72         /* Read timings */
  73         t.cs_on = 0;
  74         t.adv_on = t.cs_on;
  75         t.oe_on = t.adv_on + t3;
  76         t.access = t.oe_on + t5;
  77         t.oe_off = t.access;
  78         t.adv_rd_off = t.oe_off + max(t4_r, t6);
  79         t.cs_rd_off = t.oe_off;
  80         t.rd_cycle = t20 - t.oe_on;
  81
  82         /* Write timings */
  83         t.we_on = t.adv_on + t3;
  84
  85         if (cpu_is_omap34xx() && (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)) {
  86                 t.wr_data_mux_bus = t.we_on;
  87                 t.we_off = t.wr_data_mux_bus + t7;
  88         } else
  89                 t.we_off = t.we_on + t7;
  90         if (cpu_is_omap34xx())
  91                 t.wr_access = t.we_off;
  92         t.adv_wr_off = t.we_off + max(t4_w, t8);
  93         t.cs_wr_off = t.we_off + t4_w;
  94         t.wr_cycle = t20 - t.we_on;
  95
  96         l = GPMC_CONFIG1_DEVICESIZE_16;
  97         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
  98                 l |= GPMC_CONFIG1_MUXADDDATA;
  99         if (gpmc_cfg->flags & GPMC_READ_MON)
 100                 l |= GPMC_CONFIG1_WAIT_READ_MON;
 101         if (gpmc_cfg->flags & GPMC_WRITE_MON)
 102                 l |= GPMC_CONFIG1_WAIT_WRITE_MON;
 103         if (gpmc_cfg->wait_pin)
 104                 l |= GPMC_CONFIG1_WAIT_PIN_SEL(gpmc_cfg->wait_pin);
 105         gpmc_cs_write_reg(gpmc_cfg->cs, GPMC_CS_CONFIG1, l);
 106
 107         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
 108                 return 0;
 109
 110         return gpmc_cs_set_timings(gpmc_cfg->cs, &t);
 111 }
 112
 113 /*
 114  * Initialize smc91x device connected to the GPMC. Note that we
 115  * assume that pin multiplexing is done in the board-*.c file,
 116  * or in the bootloader.
 117  */
 118 void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data)
 119 {
 120         unsigned long cs_mem_base;
 121         int ret;
 122
 123         gpmc_cfg = board_data;
 124
 125         if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96)
 126                 gpmc_cfg->retime = smc91c96_gpmc_retime;
 127
 128         if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
 129                 printk(KERN_ERR "Failed to request GPMC mem for smc91x\n");
 130                 return;
 131         }
 132
 133         gpmc_smc91x_resources[0].start = cs_mem_base + 0x300;
 134         gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f;
 135         gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK);
 136
 137         if (gpmc_cfg->retime) {
 138                 ret = gpmc_cfg->retime();
 139                 if (ret != 0)
 140                         goto free1;
 141         }
 142
 143         if (gpio_request(gpmc_cfg->gpio_irq, "SMC91X irq") < 0)
 144                 goto free1;
 145
 146         gpio_direction_input(gpmc_cfg->gpio_irq);
 147         gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);
 148
 149         if (gpmc_cfg->gpio_pwrdwn) {
 150                 ret = gpio_request(gpmc_cfg->gpio_pwrdwn, "SMC91X powerdown");
 151                 if (ret)
 152                         goto free2;
 153                 gpio_direction_output(gpmc_cfg->gpio_pwrdwn, 0);
 154         }
 155
 156         if (gpmc_cfg->gpio_reset) {
 157                 ret = gpio_request(gpmc_cfg->gpio_reset, "SMC91X reset");
 158                 if (ret)
 159                         goto free3;
 160
 161                 gpio_direction_output(gpmc_cfg->gpio_reset, 0);
 162                 gpio_set_value(gpmc_cfg->gpio_reset, 1);
 163                 msleep(100);
 164                 gpio_set_value(gpmc_cfg->gpio_reset, 0);
 165         }
 166
 167         if (platform_device_register(&gpmc_smc91x_device) < 0) {
 168                 printk(KERN_ERR "Unable to register smc91x device\n");
 169                 gpio_free(gpmc_cfg->gpio_reset);
 170                 goto free3;
 171         }
 172
 173         return;
 174
 175 free3:
 176         if (gpmc_cfg->gpio_pwrdwn)
 177                 gpio_free(gpmc_cfg->gpio_pwrdwn);
 178 free2:
 179         gpio_free(gpmc_cfg->gpio_irq);
 180 free1:
 181         gpmc_cs_free(gpmc_cfg->cs);
 182
 183         printk(KERN_ERR "Could not initialize smc91x\n");
 184 }