2 * linux/arch/arm/mach-omap2/gpmc-smc91x.c
4 * Copyright (C) 2009 Nokia Corporation
5 * Contact: Tony Lindgren
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.
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>
18 #include <linux/smc91x.h>
21 #include "gpmc-smc91x.h"
25 static struct omap_smc91x_platform_data *gpmc_cfg;
27 static struct resource gpmc_smc91x_resources[] = {
29 .flags = IORESOURCE_MEM,
32 .flags = IORESOURCE_IRQ,
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,
42 static struct platform_device gpmc_smc91x_device = {
46 .platform_data = &gpmc_smc91x_info,
48 .num_resources = ARRAY_SIZE(gpmc_smc91x_resources),
49 .resource = gpmc_smc91x_resources,
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.
58 static int smc91c96_gpmc_retime(void)
60 struct gpmc_timings t;
61 struct gpmc_device_timings dev_t;
62 const int t3 = 10; /* Figure 12.2 read and 12.4 write */
63 const int t4_r = 20; /* Figure 12.2 read */
64 const int t4_w = 5; /* Figure 12.4 write */
65 const int t5 = 25; /* Figure 12.2 read */
66 const int t6 = 15; /* Figure 12.2 read */
67 const int t7 = 5; /* Figure 12.4 write */
68 const int t8 = 5; /* Figure 12.4 write */
69 const int t20 = 185; /* Figure 12.2 read and 12.4 write */
72 l = GPMC_CONFIG1_DEVICESIZE_16;
73 if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
74 l |= GPMC_CONFIG1_MUXADDDATA;
75 if (gpmc_cfg->flags & GPMC_READ_MON)
76 l |= GPMC_CONFIG1_WAIT_READ_MON;
77 if (gpmc_cfg->flags & GPMC_WRITE_MON)
78 l |= GPMC_CONFIG1_WAIT_WRITE_MON;
79 if (gpmc_cfg->wait_pin)
80 l |= GPMC_CONFIG1_WAIT_PIN_SEL(gpmc_cfg->wait_pin);
81 gpmc_cs_write_reg(gpmc_cfg->cs, GPMC_CS_CONFIG1, l);
84 * FIXME: Calculate the address and data bus muxed timings.
85 * Note that at least adv_rd_off needs to be changed according
86 * to omap3430 TRM Figure 11-11. Are the sdp boards using the
87 * FPGA in between smc91x and omap as the timings are different
90 if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
93 memset(&dev_t, 0, sizeof(dev_t));
95 dev_t.t_oeasu = t3 * 1000;
96 dev_t.t_oe = t5 * 1000;
97 dev_t.t_cez_r = t4_r * 1000;
98 dev_t.t_oez = t6 * 1000;
99 dev_t.t_rd_cycle = (t20 - t3) * 1000;
101 dev_t.t_weasu = t3 * 1000;
102 dev_t.t_wpl = t7 * 1000;
103 dev_t.t_wph = t8 * 1000;
104 dev_t.t_cez_w = t4_w * 1000;
105 dev_t.t_wr_cycle = (t20 - t3) * 1000;
107 gpmc_calc_timings(&t, &dev_t);
109 return gpmc_cs_set_timings(gpmc_cfg->cs, &t);
113 * Initialize smc91x device connected to the GPMC. Note that we
114 * assume that pin multiplexing is done in the board-*.c file,
115 * or in the bootloader.
117 void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data)
119 unsigned long cs_mem_base;
122 gpmc_cfg = board_data;
124 if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96)
125 gpmc_cfg->retime = smc91c96_gpmc_retime;
127 if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
128 printk(KERN_ERR "Failed to request GPMC mem for smc91x\n");
132 gpmc_smc91x_resources[0].start = cs_mem_base + 0x300;
133 gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f;
134 gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK);
136 if (gpmc_cfg->retime) {
137 ret = gpmc_cfg->retime();
142 if (gpio_request_one(gpmc_cfg->gpio_irq, GPIOF_IN, "SMC91X irq") < 0)
145 gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);
147 if (gpmc_cfg->gpio_pwrdwn) {
148 ret = gpio_request_one(gpmc_cfg->gpio_pwrdwn,
149 GPIOF_OUT_INIT_LOW, "SMC91X powerdown");
154 if (gpmc_cfg->gpio_reset) {
155 ret = gpio_request_one(gpmc_cfg->gpio_reset,
156 GPIOF_OUT_INIT_LOW, "SMC91X reset");
160 gpio_set_value(gpmc_cfg->gpio_reset, 1);
162 gpio_set_value(gpmc_cfg->gpio_reset, 0);
165 if (platform_device_register(&gpmc_smc91x_device) < 0) {
166 printk(KERN_ERR "Unable to register smc91x device\n");
167 gpio_free(gpmc_cfg->gpio_reset);
174 if (gpmc_cfg->gpio_pwrdwn)
175 gpio_free(gpmc_cfg->gpio_pwrdwn);
177 gpio_free(gpmc_cfg->gpio_irq);
179 gpmc_cs_free(gpmc_cfg->cs);
181 printk(KERN_ERR "Could not initialize smc91x\n");