163 lines
3.8 KiB
C
163 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/drivers/pcmcia/pxa2xx_palmtc.c
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*
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* Driver for Palm Tungsten|C PCMCIA
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*
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* Copyright (C) 2008 Alex Osborne <ato@meshy.org>
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* Copyright (C) 2009-2011 Marek Vasut <marek.vasut@gmail.com>
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*/
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#include <linux/module.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 <asm/mach-types.h>
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#include "palmtc.h"
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#include <pcmcia/soc_common.h>
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static struct gpio palmtc_pcmcia_gpios[] = {
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{ GPIO_NR_PALMTC_PCMCIA_POWER1, GPIOF_INIT_LOW, "PCMCIA Power 1" },
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{ GPIO_NR_PALMTC_PCMCIA_POWER2, GPIOF_INIT_LOW, "PCMCIA Power 2" },
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{ GPIO_NR_PALMTC_PCMCIA_POWER3, GPIOF_INIT_LOW, "PCMCIA Power 3" },
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{ GPIO_NR_PALMTC_PCMCIA_RESET, GPIOF_INIT_HIGH,"PCMCIA Reset" },
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{ GPIO_NR_PALMTC_PCMCIA_PWRREADY, GPIOF_IN, "PCMCIA Power Ready" },
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};
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static int palmtc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
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{
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int ret;
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ret = gpio_request_array(palmtc_pcmcia_gpios,
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ARRAY_SIZE(palmtc_pcmcia_gpios));
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skt->stat[SOC_STAT_RDY].gpio = GPIO_NR_PALMTC_PCMCIA_READY;
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skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";
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return ret;
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}
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static void palmtc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
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{
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gpio_free_array(palmtc_pcmcia_gpios, ARRAY_SIZE(palmtc_pcmcia_gpios));
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}
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static void palmtc_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
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struct pcmcia_state *state)
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{
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state->detect = 1; /* always inserted */
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state->vs_3v = 1;
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state->vs_Xv = 0;
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}
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static int palmtc_wifi_powerdown(void)
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{
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gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
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gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 0);
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mdelay(40);
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gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 0);
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return 0;
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}
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static int palmtc_wifi_powerup(void)
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{
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int timeout = 50;
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gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 1);
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mdelay(50);
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/* Power up the card, 1.8V first, after a while 3.3V */
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gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 1);
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mdelay(100);
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gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 1);
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/* Wait till the card is ready */
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while (!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_PWRREADY) &&
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timeout) {
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mdelay(1);
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timeout--;
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}
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/* Power down the WiFi in case of error */
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if (!timeout) {
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palmtc_wifi_powerdown();
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return 1;
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}
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/* Reset the card */
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gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
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mdelay(20);
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gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 0);
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mdelay(25);
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gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 0);
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return 0;
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}
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static int palmtc_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
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const socket_state_t *state)
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{
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int ret = 1;
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if (state->Vcc == 0)
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ret = palmtc_wifi_powerdown();
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else if (state->Vcc == 33)
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ret = palmtc_wifi_powerup();
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return ret;
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}
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static struct pcmcia_low_level palmtc_pcmcia_ops = {
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.owner = THIS_MODULE,
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.first = 0,
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.nr = 1,
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.hw_init = palmtc_pcmcia_hw_init,
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.hw_shutdown = palmtc_pcmcia_hw_shutdown,
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.socket_state = palmtc_pcmcia_socket_state,
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.configure_socket = palmtc_pcmcia_configure_socket,
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};
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static struct platform_device *palmtc_pcmcia_device;
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static int __init palmtc_pcmcia_init(void)
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{
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int ret;
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if (!machine_is_palmtc())
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return -ENODEV;
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palmtc_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
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if (!palmtc_pcmcia_device)
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return -ENOMEM;
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ret = platform_device_add_data(palmtc_pcmcia_device, &palmtc_pcmcia_ops,
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sizeof(palmtc_pcmcia_ops));
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if (!ret)
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ret = platform_device_add(palmtc_pcmcia_device);
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if (ret)
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platform_device_put(palmtc_pcmcia_device);
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return ret;
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}
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static void __exit palmtc_pcmcia_exit(void)
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{
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platform_device_unregister(palmtc_pcmcia_device);
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}
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module_init(palmtc_pcmcia_init);
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module_exit(palmtc_pcmcia_exit);
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MODULE_AUTHOR("Alex Osborne <ato@meshy.org>,"
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" Marek Vasut <marek.vasut@gmail.com>");
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MODULE_DESCRIPTION("PCMCIA support for Palm Tungsten|C");
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MODULE_ALIAS("platform:pxa2xx-pcmcia");
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MODULE_LICENSE("GPL");
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