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- /*
- * linux/arch/arm/mach-omap2/gpmc-smc91x.c
- *
- * Copyright (C) 2009 Nokia Corporation
- * Contact: Tony Lindgren
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/kernel.h>
- #include <linux/platform_device.h>
- #include <linux/gpio.h>
- #include <linux/delay.h>
- #include <linux/interrupt.h>
- #include <linux/io.h>
- #include <linux/smc91x.h>
- #include <mach/board.h>
- #include <mach/gpmc.h>
- #include <mach/gpmc-smc91x.h>
- static struct omap_smc91x_platform_data *gpmc_cfg;
- static struct resource gpmc_smc91x_resources[] = {
- [0] = {
- .flags = IORESOURCE_MEM,
- },
- [1] = {
- .flags = IORESOURCE_IRQ,
- },
- };
- static struct smc91x_platdata gpmc_smc91x_info = {
- .flags = SMC91X_USE_16BIT | SMC91X_NOWAIT | SMC91X_IO_SHIFT_0,
- };
- static struct platform_device gpmc_smc91x_device = {
- .name = "smc91x",
- .id = -1,
- .num_resources = ARRAY_SIZE(gpmc_smc91x_resources),
- .resource = gpmc_smc91x_resources,
- .dev = {
- .platform_data = &gpmc_smc91x_info,
- },
- };
- /*
- * Set the gpmc timings for smc91c96. The timings are taken
- * from the data sheet available at:
- * http://www.smsc.com/main/catalog/lan91c96.html
- * REVISIT: Level shifters can add at least to the access latency.
- */
- static int smc91c96_gpmc_retime(void)
- {
- struct gpmc_timings t;
- const int t3 = 10; /* Figure 12.2 read and 12.4 write */
- const int t4_r = 20; /* Figure 12.2 read */
- const int t4_w = 5; /* Figure 12.4 write */
- const int t5 = 25; /* Figure 12.2 read */
- const int t6 = 15; /* Figure 12.2 read */
- const int t7 = 5; /* Figure 12.4 write */
- const int t8 = 5; /* Figure 12.4 write */
- const int t20 = 185; /* Figure 12.2 read and 12.4 write */
- u32 l;
- memset(&t, 0, sizeof(t));
- /* Read timings */
- t.cs_on = 0;
- t.adv_on = t.cs_on;
- t.oe_on = t.adv_on + t3;
- t.access = t.oe_on + t5;
- t.oe_off = t.access;
- t.adv_rd_off = t.oe_off + max(t4_r, t6);
- t.cs_rd_off = t.oe_off;
- t.rd_cycle = t20 - t.oe_on;
- /* Write timings */
- t.we_on = t.adv_on + t3;
- if (cpu_is_omap34xx() && (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)) {
- t.wr_data_mux_bus = t.we_on;
- t.we_off = t.wr_data_mux_bus + t7;
- } else
- t.we_off = t.we_on + t7;
- if (cpu_is_omap34xx())
- t.wr_access = t.we_off;
- t.adv_wr_off = t.we_off + max(t4_w, t8);
- t.cs_wr_off = t.we_off + t4_w;
- t.wr_cycle = t20 - t.we_on;
- l = GPMC_CONFIG1_DEVICESIZE_16;
- if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
- l |= GPMC_CONFIG1_MUXADDDATA;
- if (gpmc_cfg->flags & GPMC_READ_MON)
- l |= GPMC_CONFIG1_WAIT_READ_MON;
- if (gpmc_cfg->flags & GPMC_WRITE_MON)
- l |= GPMC_CONFIG1_WAIT_WRITE_MON;
- if (gpmc_cfg->wait_pin)
- l |= GPMC_CONFIG1_WAIT_PIN_SEL(gpmc_cfg->wait_pin);
- gpmc_cs_write_reg(gpmc_cfg->cs, GPMC_CS_CONFIG1, l);
- /*
- * FIXME: Calculate the address and data bus muxed timings.
- * Note that at least adv_rd_off needs to be changed according
- * to omap3430 TRM Figure 11-11. Are the sdp boards using the
- * FPGA in between smc91x and omap as the timings are different
- * from above?
- */
- if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
- return 0;
- return gpmc_cs_set_timings(gpmc_cfg->cs, &t);
- }
- /*
- * Initialize smc91x device connected to the GPMC. Note that we
- * assume that pin multiplexing is done in the board-*.c file,
- * or in the bootloader.
- */
- void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data)
- {
- unsigned long cs_mem_base;
- int ret;
- gpmc_cfg = board_data;
- if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96)
- gpmc_cfg->retime = smc91c96_gpmc_retime;
- if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
- printk(KERN_ERR "Failed to request GPMC mem for smc91x\n");
- return;
- }
- gpmc_smc91x_resources[0].start = cs_mem_base + 0x300;
- gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f;
- gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK);
- if (gpmc_cfg->retime) {
- ret = gpmc_cfg->retime();
- if (ret != 0)
- goto free1;
- }
- if (gpio_request(gpmc_cfg->gpio_irq, "SMC91X irq") < 0)
- goto free1;
- gpio_direction_input(gpmc_cfg->gpio_irq);
- gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);
- if (gpmc_cfg->gpio_pwrdwn) {
- ret = gpio_request(gpmc_cfg->gpio_pwrdwn, "SMC91X powerdown");
- if (ret)
- goto free2;
- gpio_direction_output(gpmc_cfg->gpio_pwrdwn, 0);
- }
- if (gpmc_cfg->gpio_reset) {
- ret = gpio_request(gpmc_cfg->gpio_reset, "SMC91X reset");
- if (ret)
- goto free3;
- gpio_direction_output(gpmc_cfg->gpio_reset, 0);
- gpio_set_value(gpmc_cfg->gpio_reset, 1);
- msleep(100);
- gpio_set_value(gpmc_cfg->gpio_reset, 0);
- }
- if (platform_device_register(&gpmc_smc91x_device) < 0) {
- printk(KERN_ERR "Unable to register smc91x device\n");
- gpio_free(gpmc_cfg->gpio_reset);
- goto free3;
- }
- return;
- free3:
- if (gpmc_cfg->gpio_pwrdwn)
- gpio_free(gpmc_cfg->gpio_pwrdwn);
- free2:
- gpio_free(gpmc_cfg->gpio_irq);
- free1:
- gpmc_cs_free(gpmc_cfg->cs);
- printk(KERN_ERR "Could not initialize smc91x\n");
- }
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