1// SPDX-License-Identifier: GPL-2.0
  2//
  3// Copyright 2004-2005 Simtec Electronics
  4//   Ben Dooks <ben@simtec.co.uk>
  5//
  6// http://www.simtec.co.uk/products/EB2410ITX/
  7//
  8// Simtec BAST and Thorcom VR1000 USB port support functions
  9
 10#define DEBUG
 11
 12#include <linux/kernel.h>
 13#include <linux/types.h>
 14#include <linux/interrupt.h>
 15#include <linux/list.h>
 16#include <linux/gpio.h>
 17#include <linux/timer.h>
 18#include <linux/init.h>
 19#include <linux/device.h>
 20#include <linux/io.h>
 21
 22#include <asm/mach/arch.h>
 23#include <asm/mach/map.h>
 24#include <asm/mach/irq.h>
 25
 26#include "gpio-samsung.h"
 27#include "irqs.h"
 28#include <asm/irq.h>
 29
 30#include <linux/platform_data/usb-ohci-s3c2410.h>
 31#include "devs.h"
 32
 33#include "bast.h"
 34#include "simtec.h"
 35
 36/* control power and monitor over-current events on various Simtec
 37 * designed boards.
 38*/
 39
 40static unsigned int power_state[2];
 41
 42static void
 43usb_simtec_powercontrol(int port, int to)
 44{
 45	pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
 46
 47	power_state[port] = to;
 48
 49	if (power_state[0] && power_state[1])
 50		gpio_set_value(S3C2410_GPB(4), 0);
 51	else
 52		gpio_set_value(S3C2410_GPB(4), 1);
 53}
 54
 55static irqreturn_t
 56usb_simtec_ocirq(int irq, void *pw)
 57{
 58	struct s3c2410_hcd_info *info = pw;
 59
 60	if (gpio_get_value(S3C2410_GPG(10)) == 0) {
 61		pr_debug("usb_simtec: over-current irq (oc detected)\n");
 62		s3c2410_usb_report_oc(info, 3);
 63	} else {
 64		pr_debug("usb_simtec: over-current irq (oc cleared)\n");
 65		s3c2410_usb_report_oc(info, 0);
 66	}
 67
 68	return IRQ_HANDLED;
 69}
 70
 71static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
 72{
 73	int ret;
 74
 75	if (on) {
 76		ret = request_irq(BAST_IRQ_USBOC, usb_simtec_ocirq,
 77				  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 78				  "USB Over-current", info);
 79		if (ret != 0) {
 80			printk(KERN_ERR "failed to request usb oc irq\n");
 81		}
 82	} else {
 83		free_irq(BAST_IRQ_USBOC, info);
 84	}
 85}
 86
 87static struct s3c2410_hcd_info usb_simtec_info __initdata = {
 88	.port[0]	= {
 89		.flags	= S3C_HCDFLG_USED
 90	},
 91	.port[1]	= {
 92		.flags	= S3C_HCDFLG_USED
 93	},
 94
 95	.power_control	= usb_simtec_powercontrol,
 96	.enable_oc	= usb_simtec_enableoc,
 97};
 98
 99
100int __init usb_simtec_init(void)
101{
102	int ret;
103
104	printk("USB Power Control, Copyright 2004 Simtec Electronics\n");
105
106	ret = gpio_request(S3C2410_GPB(4), "USB power control");
107	if (ret < 0) {
108		pr_err("%s: failed to get GPB4\n", __func__);
109		return ret;
110	}
111
112	ret = gpio_request(S3C2410_GPG(10), "USB overcurrent");
113	if (ret < 0) {
114		pr_err("%s: failed to get GPG10\n", __func__);
115		gpio_free(S3C2410_GPB(4));
116		return ret;
117	}
118
119	/* turn power on */
120	gpio_direction_output(S3C2410_GPB(4), 1);
121	gpio_direction_input(S3C2410_GPG(10));
122
123	s3c_ohci_set_platdata(&usb_simtec_info);
124	return 0;
125}