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 <mach/board.h>
  21 #include <mach/gpmc.h>
  22 #include <mach/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 };
  38
  39 static struct platform_device gpmc_smc91x_device = {
  40         .name           = "smc91x",
  41         .id             = -1,
  42         .num_resources  = ARRAY_SIZE(gpmc_smc91x_resources),
  43         .resource       = gpmc_smc91x_resources,
  44         .dev            = {
  45                 .platform_data = &gpmc_smc91x_info,
  46         },
  47 };
  48
  49 /*
  50  * Set the gpmc timings for smc91c96. The timings are taken
  51  * from the data sheet available at:
  52  * http://www.smsc.com/main/catalog/lan91c96.html
  53  * REVISIT: Level shifters can add at least to the access latency.
  54  */
  55 static int smc91c96_gpmc_retime(void)
  56 {
  57         struct gpmc_timings t;
  58         const int t3 = 10;      /* Figure 12.2 read and 12.4 write */
  59         const int t4_r = 20;    /* Figure 12.2 read */
  60         const int t4_w = 5;     /* Figure 12.4 write */
  61         const int t5 = 25;      /* Figure 12.2 read */
  62         const int t6 = 15;      /* Figure 12.2 read */
  63         const int t7 = 5;       /* Figure 12.4 write */
  64         const int t8 = 5;       /* Figure 12.4 write */
  65         const int t20 = 185;    /* Figure 12.2 read and 12.4 write */
  66         u32 l;
  67
  68         memset(&t, 0, sizeof(t));
  69
  70         /* Read timings */
  71         t.cs_on = 0;
  72         t.adv_on = t.cs_on;
  73         t.oe_on = t.adv_on + t3;
  74         t.access = t.oe_on + t5;
  75         t.oe_off = t.access;
  76         t.adv_rd_off = t.oe_off + max(t4_r, t6);
  77         t.cs_rd_off = t.oe_off;
  78         t.rd_cycle = t20 - t.oe_on;
  79
  80         /* Write timings */
  81         t.we_on = t.adv_on + t3;
  82
  83         if (cpu_is_omap34xx() && (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)) {
  84                 t.wr_data_mux_bus = t.we_on;
  85                 t.we_off = t.wr_data_mux_bus + t7;
  86         } else
  87                 t.we_off = t.we_on + t7;
  88         if (cpu_is_omap34xx())
  89                 t.wr_access = t.we_off;
  90         t.adv_wr_off = t.we_off + max(t4_w, t8);
  91         t.cs_wr_off = t.we_off + t4_w;
  92         t.wr_cycle = t20 - t.we_on;
  93
  94         l = GPMC_CONFIG1_DEVICESIZE_16;
  95         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
  96                 l |= GPMC_CONFIG1_MUXADDDATA;
  97         if (gpmc_cfg->flags & GPMC_READ_MON)
  98                 l |= GPMC_CONFIG1_WAIT_READ_MON;
  99         if (gpmc_cfg->flags & GPMC_WRITE_MON)
 100                 l |= GPMC_CONFIG1_WAIT_WRITE_MON;
 101         if (gpmc_cfg->wait_pin)
 102                 l |= GPMC_CONFIG1_WAIT_PIN_SEL(gpmc_cfg->wait_pin);
 103         gpmc_cs_write_reg(gpmc_cfg->cs, GPMC_CS_CONFIG1, l);
 104
 105         /*
 106          * FIXME: Calculate the address and data bus muxed timings.
 107          * Note that at least adv_rd_off needs to be changed according
 108          * to omap3430 TRM Figure 11-11. Are the sdp boards using the
 109          * FPGA in between smc91x and omap as the timings are different
 110          * from above?
 111          */
 112         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
 113                 return 0;
 114
 115         return gpmc_cs_set_timings(gpmc_cfg->cs, &t);
 116 }
 117
 118 /*
 119  * Initialize smc91x device connected to the GPMC. Note that we
 120  * assume that pin multiplexing is done in the board-*.c file,
 121  * or in the bootloader.
 122  */
 123 void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data)
 124 {
 125         unsigned long cs_mem_base;
 126         int ret;
 127
 128         gpmc_cfg = board_data;
 129
 130         if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96)
 131                 gpmc_cfg->retime = smc91c96_gpmc_retime;
 132
 133         if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
 134                 printk(KERN_ERR "Failed to request GPMC mem for smc91x\n");
 135                 return;
 136         }
 137
 138         gpmc_smc91x_resources[0].start = cs_mem_base + 0x300;
 139         gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f;
 140         gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK);
 141
 142         if (gpmc_cfg->retime) {
 143                 ret = gpmc_cfg->retime();
 144                 if (ret != 0)
 145                         goto free1;
 146         }
 147
 148         if (gpio_request(gpmc_cfg->gpio_irq, "SMC91X irq") < 0)
 149                 goto free1;
 150
 151         gpio_direction_input(gpmc_cfg->gpio_irq);
 152         gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);
 153
 154         if (gpmc_cfg->gpio_pwrdwn) {
 155                 ret = gpio_request(gpmc_cfg->gpio_pwrdwn, "SMC91X powerdown");
 156                 if (ret)
 157                         goto free2;
 158                 gpio_direction_output(gpmc_cfg->gpio_pwrdwn, 0);
 159         }
 160
 161         if (gpmc_cfg->gpio_reset) {
 162                 ret = gpio_request(gpmc_cfg->gpio_reset, "SMC91X reset");
 163                 if (ret)
 164                         goto free3;
 165
 166                 gpio_direction_output(gpmc_cfg->gpio_reset, 0);
 167                 gpio_set_value(gpmc_cfg->gpio_reset, 1);
 168                 msleep(100);
 169                 gpio_set_value(gpmc_cfg->gpio_reset, 0);
 170         }
 171
 172         if (platform_device_register(&gpmc_smc91x_device) < 0) {
 173                 printk(KERN_ERR "Unable to register smc91x device\n");
 174                 gpio_free(gpmc_cfg->gpio_reset);
 175                 goto free3;
 176         }
 177
 178         return;
 179
 180 free3:
 181         if (gpmc_cfg->gpio_pwrdwn)
 182                 gpio_free(gpmc_cfg->gpio_pwrdwn);
 183 free2:
 184         gpio_free(gpmc_cfg->gpio_irq);
 185 free1:
 186         gpmc_cs_free(gpmc_cfg->cs);
 187
 188         printk(KERN_ERR "Could not initialize smc91x\n");
 189 }