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https://github.com/edk2-porting/linux-next.git
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1119f3c3ce
Convert the OMAP2+ SMC91x code to use the gpmc_cs_program_settings() function for configuring the various GPMC options instead of directly programming the CONFIG1 register. Move configuration of the GPMC settings outside retime function and this does not need to be done if the timings are changed dynamically at runtime. Signed-off-by: Jon Hunter <jon-hunter@ti.com> Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
187 lines
4.8 KiB
C
187 lines
4.8 KiB
C
/*
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* linux/arch/arm/mach-omap2/gpmc-smc91x.c
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*
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* Copyright (C) 2009 Nokia Corporation
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* Contact: Tony Lindgren
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/smc91x.h>
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#include "gpmc.h"
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#include "gpmc-smc91x.h"
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#include "soc.h"
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static struct omap_smc91x_platform_data *gpmc_cfg;
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static struct resource gpmc_smc91x_resources[] = {
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[0] = {
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.flags = IORESOURCE_MEM,
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},
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[1] = {
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct smc91x_platdata gpmc_smc91x_info = {
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.flags = SMC91X_USE_16BIT | SMC91X_NOWAIT | SMC91X_IO_SHIFT_0,
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.leda = RPC_LED_100_10,
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.ledb = RPC_LED_TX_RX,
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};
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static struct platform_device gpmc_smc91x_device = {
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.name = "smc91x",
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.id = -1,
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.dev = {
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.platform_data = &gpmc_smc91x_info,
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},
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.num_resources = ARRAY_SIZE(gpmc_smc91x_resources),
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.resource = gpmc_smc91x_resources,
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};
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static struct gpmc_settings smc91x_settings = {
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.device_width = GPMC_DEVWIDTH_16BIT,
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};
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/*
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* Set the gpmc timings for smc91c96. The timings are taken
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* from the data sheet available at:
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* http://www.smsc.com/main/catalog/lan91c96.html
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* REVISIT: Level shifters can add at least to the access latency.
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*/
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static int smc91c96_gpmc_retime(void)
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{
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struct gpmc_timings t;
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struct gpmc_device_timings dev_t;
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const int t3 = 10; /* Figure 12.2 read and 12.4 write */
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const int t4_r = 20; /* Figure 12.2 read */
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const int t4_w = 5; /* Figure 12.4 write */
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const int t5 = 25; /* Figure 12.2 read */
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const int t6 = 15; /* Figure 12.2 read */
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const int t7 = 5; /* Figure 12.4 write */
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const int t8 = 5; /* Figure 12.4 write */
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const int t20 = 185; /* Figure 12.2 read and 12.4 write */
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/*
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* FIXME: Calculate the address and data bus muxed timings.
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* Note that at least adv_rd_off needs to be changed according
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* to omap3430 TRM Figure 11-11. Are the sdp boards using the
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* FPGA in between smc91x and omap as the timings are different
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* from above?
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*/
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if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
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return 0;
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memset(&dev_t, 0, sizeof(dev_t));
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dev_t.t_oeasu = t3 * 1000;
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dev_t.t_oe = t5 * 1000;
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dev_t.t_cez_r = t4_r * 1000;
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dev_t.t_oez = t6 * 1000;
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dev_t.t_rd_cycle = (t20 - t3) * 1000;
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dev_t.t_weasu = t3 * 1000;
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dev_t.t_wpl = t7 * 1000;
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dev_t.t_wph = t8 * 1000;
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dev_t.t_cez_w = t4_w * 1000;
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dev_t.t_wr_cycle = (t20 - t3) * 1000;
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gpmc_calc_timings(&t, &smc91x_settings, &dev_t);
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return gpmc_cs_set_timings(gpmc_cfg->cs, &t);
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}
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/*
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* Initialize smc91x device connected to the GPMC. Note that we
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* assume that pin multiplexing is done in the board-*.c file,
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* or in the bootloader.
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*/
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void __init gpmc_smc91x_init(struct omap_smc91x_platform_data *board_data)
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{
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unsigned long cs_mem_base;
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int ret;
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gpmc_cfg = board_data;
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if (gpmc_cfg->flags & GPMC_TIMINGS_SMC91C96)
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gpmc_cfg->retime = smc91c96_gpmc_retime;
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if (gpmc_cs_request(gpmc_cfg->cs, SZ_16M, &cs_mem_base) < 0) {
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printk(KERN_ERR "Failed to request GPMC mem for smc91x\n");
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return;
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}
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gpmc_smc91x_resources[0].start = cs_mem_base + 0x300;
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gpmc_smc91x_resources[0].end = cs_mem_base + 0x30f;
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gpmc_smc91x_resources[1].flags |= (gpmc_cfg->flags & IRQF_TRIGGER_MASK);
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if (gpmc_cfg->flags & GPMC_MUX_ADD_DATA)
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smc91x_settings.mux_add_data = GPMC_MUX_AD;
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if (gpmc_cfg->flags & GPMC_READ_MON)
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smc91x_settings.wait_on_read = true;
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if (gpmc_cfg->flags & GPMC_WRITE_MON)
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smc91x_settings.wait_on_write = true;
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if (gpmc_cfg->wait_pin)
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smc91x_settings.wait_pin = gpmc_cfg->wait_pin;
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ret = gpmc_cs_program_settings(gpmc_cfg->cs, &smc91x_settings);
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if (ret < 0)
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goto free1;
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if (gpmc_cfg->retime) {
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ret = gpmc_cfg->retime();
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if (ret != 0)
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goto free1;
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}
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if (gpio_request_one(gpmc_cfg->gpio_irq, GPIOF_IN, "SMC91X irq") < 0)
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goto free1;
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gpmc_smc91x_resources[1].start = gpio_to_irq(gpmc_cfg->gpio_irq);
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if (gpmc_cfg->gpio_pwrdwn) {
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ret = gpio_request_one(gpmc_cfg->gpio_pwrdwn,
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GPIOF_OUT_INIT_LOW, "SMC91X powerdown");
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if (ret)
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goto free2;
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}
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if (gpmc_cfg->gpio_reset) {
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ret = gpio_request_one(gpmc_cfg->gpio_reset,
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GPIOF_OUT_INIT_LOW, "SMC91X reset");
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if (ret)
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goto free3;
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gpio_set_value(gpmc_cfg->gpio_reset, 1);
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msleep(100);
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gpio_set_value(gpmc_cfg->gpio_reset, 0);
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}
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if (platform_device_register(&gpmc_smc91x_device) < 0) {
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printk(KERN_ERR "Unable to register smc91x device\n");
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gpio_free(gpmc_cfg->gpio_reset);
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goto free3;
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}
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return;
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free3:
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if (gpmc_cfg->gpio_pwrdwn)
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gpio_free(gpmc_cfg->gpio_pwrdwn);
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free2:
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gpio_free(gpmc_cfg->gpio_irq);
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free1:
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gpmc_cs_free(gpmc_cfg->cs);
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printk(KERN_ERR "Could not initialize smc91x\n");
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}
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