summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-s3c24xx/simtec-usb.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-s3c24xx/simtec-usb.c')
-rw-r--r--arch/arm/mach-s3c24xx/simtec-usb.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/simtec-usb.c b/arch/arm/mach-s3c24xx/simtec-usb.c
new file mode 100644
index 0000000..d91c1a7
--- /dev/null
+++ b/arch/arm/mach-s3c24xx/simtec-usb.c
@@ -0,0 +1,132 @@
+/* linux/arch/arm/mach-s3c2410/usb-simtec.c
+ *
+ * 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
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#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 <mach/bast-map.h>
+#include <mach/bast-irq.h>
+
+#include <mach/hardware.h>
+#include <asm/irq.h>
+
+#include <plat/usb-control.h>
+#include <plat/devs.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(IRQ_USBOC, usb_simtec_ocirq,
+ IRQF_DISABLED | 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(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 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;
+}