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 24static struct omap_smc91x_platform_data *gpmc_cfg; 25 26static struct resource gpmc_smc91x_resources[] = { 27 [0] = { 28 .flags = IORESOURCE_MEM, 29 }, 30 [1] = { 31 .flags = IORESOURCE_IRQ, 32 }, 33}; 34 35static 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 41static 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 */ 57static 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 */ 118void __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 175free3: 176 if (gpmc_cfg->gpio_pwrdwn) 177 gpio_free(gpmc_cfg->gpio_pwrdwn); 178free2: 179 gpio_free(gpmc_cfg->gpio_irq); 180free1: 181 gpmc_cs_free(gpmc_cfg->cs); 182 183 printk(KERN_ERR "Could not initialize smc91x\n"); 184} 185