linux/arch/arm/mach-s3c/simtec-usb.c
Arnd Bergmann c78a41fc04 ARM: s3c24xx: convert to sparse-irq
As a final bit of preparation for converting to ARCH_MULTIPLATFORM,
change the interrupt handling for s3c24xx to use sparse IRQs.

Since the number of possible interrupts is already fixed and relatively
small per chip, just make it use all legacy interrupts preallocated
using the .nr_irqs field in the machine descriptor, rather than actually
allocating domains on the fly.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2022-04-07 09:31:31 +02:00

126 lines
2.6 KiB
C

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