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         const int t3 = 10;      /* Figure 12.2 read and 12.4 write */
  62         const int t4_r = 20;    /* Figure 12.2 read */
  63         const int t4_w = 5;     /* Figure 12.4 write */
  64         const int t5 = 25;      /* Figure 12.2 read */
  65         const int t6 = 15;      /* Figure 12.2 read */
  66         const int t7 = 5;       /* Figure 12.4 write */
  67         const int t8 = 5;       /* Figure 12.4 write */
  68         const int t20 = 185;    /* Figure 12.2 read and 12.4 write */
  69         u32 l;
  70
  71         memset(&t, 0, sizeof(t));
  72
  73         /* Read timings */
  74         t.cs_on = 0;
  75         t.adv_on = t.cs_on;
  76         t.oe_on = t.adv_on + t3;
  77         t.access = t.oe_on + t5;
  78         t.oe_off = t.access;
  79         t.adv_rd_off = t.oe_off + max(t4_r, t6);
  80         t.cs_rd_off = t.oe_off;
  81         t.rd_cycle = t20 - t.oe_on;
  82
  83         /* Write timings */
  84         t.we_on = t.adv_on + t3;
  85
  86         if (cpu_is_omap34xx() && (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)) {
  87                 t.wr_data_mux_bus = t.we_on;
  88                 t.we_off = t.wr_data_mux_bus + t7;
  89         } else
  90                 t.we_off = t.we_on + t7;
  91         if (cpu_is_omap34xx())
  92                 t.wr_access = t.we_off;
  93         t.adv_wr_off = t.we_off + max(t4_w, t8);
  94         t.cs_wr_off = t.we_off + t4_w;
  95         t.wr_cycle = t20 - t.we_on;
  96
  97         l = GPMC_CONFIG1_DEVICESIZE_16;
  98         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
  99                 l |= GPMC_CONFIG1_MUXADDDATA;
 100         if (gpmc_cfg->flags & GPMC_READ_MON)
 101                 l |= GPMC_CONFIG1_WAIT_READ_MON;
 102         if (gpmc_cfg->flags & GPMC_WRITE_MON)
 103                 l |= GPMC_CONFIG1_WAIT_WRITE_MON;
 104         if (gpmc_cfg->wait_pin)
 105                 l |= GPMC_CONFIG1_WAIT_PIN_SEL(gpmc_cfg->wait_pin);
 106         gpmc_cs_write_reg(gpmc_cfg->cs, GPMC_CS_CONFIG1, l);
 107
 108         /*
 109          * FIXME: Calculate the address and data bus muxed timings.
 110          * Note that at least adv_rd_off needs to be changed according
 111          * to omap3430 TRM Figure 11-11. Are the sdp boards using the
 112          * FPGA in between smc91x and omap as the timings are different
 113          * from above?
 114          */
 115         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
 116                 return 0;
 117
 118         return gpmc_cs_set_timings(gpmc_cfg->cs, &t);
 119 }
 120
 121 /*
 122  * Initialize smc91x device connected to the GPMC. Note that we
 123  * assume that pin multiplexing is done in the board-*.c file,
 124  * or in the bootloader.
 125  */
 126 void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data)
 127 {
 128         unsigned long cs_mem_base;
 129         int ret;
 130
 131         gpmc_cfg = board_data;
 132
 133         if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96)
 134                 gpmc_cfg->retime = smc91c96_gpmc_retime;
 135
 136         if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
 137                 printk(KERN_ERR "Failed to request GPMC mem for smc91x\n");
 138                 return;
 139         }
 140
 141         gpmc_smc91x_resources[0].start = cs_mem_base + 0x300;
 142         gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f;
 143         gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK);
 144
 145         if (gpmc_cfg->retime) {
 146                 ret = gpmc_cfg->retime();
 147                 if (ret != 0)
 148                         goto free1;
 149         }
 150
 151         if (gpio_request_one(gpmc_cfg->gpio_irq, GPIOF_IN, "SMC91X irq") < 0)
 152                 goto free1;
 153
 154         gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);
 155
 156         if (gpmc_cfg->gpio_pwrdwn) {
 157                 ret = gpio_request_one(gpmc_cfg->gpio_pwrdwn,
 158                                        GPIOF_OUT_INIT_LOW, "SMC91X powerdown");
 159                 if (ret)
 160                         goto free2;
 161         }
 162
 163         if (gpmc_cfg->gpio_reset) {
 164                 ret = gpio_request_one(gpmc_cfg->gpio_reset,
 165                                        GPIOF_OUT_INIT_LOW, "SMC91X reset");
 166                 if (ret)
 167                         goto free3;
 168
 169                 gpio_set_value(gpmc_cfg->gpio_reset, 1);
 170                 msleep(100);
 171                 gpio_set_value(gpmc_cfg->gpio_reset, 0);
 172         }
 173
 174         if (platform_device_register(&gpmc_smc91x_device) < 0) {
 175                 printk(KERN_ERR "Unable to register smc91x device\n");
 176                 gpio_free(gpmc_cfg->gpio_reset);
 177                 goto free3;
 178         }
 179
 180         return;
 181
 182 free3:
 183         if (gpmc_cfg->gpio_pwrdwn)
 184                 gpio_free(gpmc_cfg->gpio_pwrdwn);
 185 free2:
 186         gpio_free(gpmc_cfg->gpio_irq);
 187 free1:
 188         gpmc_cs_free(gpmc_cfg->cs);
 189
 190         printk(KERN_ERR "Could not initialize smc91x\n");
 191 }