126 lines
2.6 KiB
C
126 lines
2.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright 2004-2005 Simtec Electronics
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// Ben Dooks <ben@simtec.co.uk>
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//
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// http://www.simtec.co.uk/products/EB2410ITX/
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//
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// Simtec BAST and Thorcom VR1000 USB port support functions
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#define DEBUG
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/gpio.h>
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#include <linux/timer.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <asm/mach/irq.h>
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#include "gpio-samsung.h"
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#include <mach/irqs.h>
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#include <asm/irq.h>
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#include <linux/platform_data/usb-ohci-s3c2410.h>
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#include "devs.h"
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#include "bast.h"
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#include "simtec.h"
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/* control power and monitor over-current events on various Simtec
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* designed boards.
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*/
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static unsigned int power_state[2];
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static void
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usb_simtec_powercontrol(int port, int to)
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{
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pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
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power_state[port] = to;
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if (power_state[0] && power_state[1])
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gpio_set_value(S3C2410_GPB(4), 0);
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else
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gpio_set_value(S3C2410_GPB(4), 1);
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}
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static irqreturn_t
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usb_simtec_ocirq(int irq, void *pw)
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{
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struct s3c2410_hcd_info *info = pw;
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if (gpio_get_value(S3C2410_GPG(10)) == 0) {
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pr_debug("usb_simtec: over-current irq (oc detected)\n");
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s3c2410_usb_report_oc(info, 3);
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} else {
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pr_debug("usb_simtec: over-current irq (oc cleared)\n");
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s3c2410_usb_report_oc(info, 0);
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}
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return IRQ_HANDLED;
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}
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static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
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{
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int ret;
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if (on) {
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ret = request_irq(BAST_IRQ_USBOC, usb_simtec_ocirq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"USB Over-current", info);
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if (ret != 0) {
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printk(KERN_ERR "failed to request usb oc irq\n");
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}
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} else {
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free_irq(BAST_IRQ_USBOC, info);
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}
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}
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static struct s3c2410_hcd_info usb_simtec_info __initdata = {
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.port[0] = {
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.flags = S3C_HCDFLG_USED
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},
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.port[1] = {
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.flags = S3C_HCDFLG_USED
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},
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.power_control = usb_simtec_powercontrol,
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.enable_oc = usb_simtec_enableoc,
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};
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int __init usb_simtec_init(void)
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{
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int ret;
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printk("USB Power Control, Copyright 2004 Simtec Electronics\n");
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ret = gpio_request(S3C2410_GPB(4), "USB power control");
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if (ret < 0) {
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pr_err("%s: failed to get GPB4\n", __func__);
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return ret;
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}
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ret = gpio_request(S3C2410_GPG(10), "USB overcurrent");
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if (ret < 0) {
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pr_err("%s: failed to get GPG10\n", __func__);
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gpio_free(S3C2410_GPB(4));
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return ret;
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}
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/* turn power on */
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gpio_direction_output(S3C2410_GPB(4), 1);
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gpio_direction_input(S3C2410_GPG(10));
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s3c_ohci_set_platdata(&usb_simtec_info);
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return 0;
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}
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