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         /*
 108          * FIXME: Calculate the address and data bus muxed timings.
 109          * Note that at least adv_rd_off needs to be changed according
 110          * to omap3430 TRM Figure 11-11. Are the sdp boards using the
 111          * FPGA in between smc91x and omap as the timings are different
 112          * from above?
 113          */
 114         if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
 115                 return 0;
 116
 117         return gpmc_cs_set_timings(gpmc_cfg->cs, &t);
 118 }
 119
 120 /*
 121  * Initialize smc91x device connected to the GPMC. Note that we
 122  * assume that pin multiplexing is done in the board-*.c file,
 123  * or in the bootloader.
 124  */
 125 void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data)
 126 {
 127         unsigned long cs_mem_base;
 128         int ret;
 129
 130         gpmc_cfg = board_data;
 131
 132         if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96)
 133                 gpmc_cfg->retime = smc91c96_gpmc_retime;
 134
 135         if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
 136                 printk(KERN_ERR "Failed to request GPMC mem for smc91x\n");
 137                 return;
 138         }
 139
 140         gpmc_smc91x_resources[0].start = cs_mem_base + 0x300;
 141         gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f;
 142         gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK);
 143
 144         if (gpmc_cfg->retime) {
 145                 ret = gpmc_cfg->retime();
 146                 if (ret != 0)
 147                         goto free1;
 148         }
 149
 150         if (gpio_request_one(gpmc_cfg->gpio_irq, GPIOF_IN, "SMC91X irq") < 0)
 151                 goto free1;
 152
 153         gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);
 154
 155         if (gpmc_cfg->gpio_pwrdwn) {
 156                 ret = gpio_request_one(gpmc_cfg->gpio_pwrdwn,
 157                                        GPIOF_OUT_INIT_LOW, "SMC91X powerdown");
 158                 if (ret)
 159                         goto free2;
 160         }
 161
 162         if (gpmc_cfg->gpio_reset) {
 163                 ret = gpio_request_one(gpmc_cfg->gpio_reset,
 164                                        GPIOF_OUT_INIT_LOW, "SMC91X reset");
 165                 if (ret)
 166                         goto free3;
 167
 168                 gpio_set_value(gpmc_cfg->gpio_reset, 1);
 169                 msleep(100);
 170                 gpio_set_value(gpmc_cfg->gpio_reset, 0);
 171         }
 172
 173         if (platform_device_register(&gpmc_smc91x_device) < 0) {
 174                 printk(KERN_ERR "Unable to register smc91x device\n");
 175                 gpio_free(gpmc_cfg->gpio_reset);
 176                 goto free3;
 177         }
 178
 179         return;
 180
 181 free3:
 182         if (gpmc_cfg->gpio_pwrdwn)
 183                 gpio_free(gpmc_cfg->gpio_pwrdwn);
 184 free2:
 185         gpio_free(gpmc_cfg->gpio_irq);
 186 free1:
 187         gpmc_cs_free(gpmc_cfg->cs);
 188
 189         printk(KERN_ERR "Could not initialize smc91x\n");
 190 }