/* * 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"); }