arm/mach-s3c/simtec-usb.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 //
0003 // Copyright 2004-2005 Simtec Electronics
0004 //   Ben Dooks <ben@simtec.co.uk>
0005 //
0006 // http://www.simtec.co.uk/products/EB2410ITX/
0007 //
0008 // Simtec BAST and Thorcom VR1000 USB port support functions
0009
0010 #define DEBUG
0011
0012 #include <linux/kernel.h>
0013 #include <linux/types.h>
0014 #include <linux/interrupt.h>
0015 #include <linux/list.h>
0016 #include <linux/gpio.h>
0017 #include <linux/timer.h>
0018 #include <linux/init.h>
0019 #include <linux/device.h>
0020 #include <linux/io.h>
0021
0022 #include <asm/mach/arch.h>
0023 #include <asm/mach/map.h>
0024 #include <asm/mach/irq.h>
0025
0026 #include "gpio-samsung.h"
0027 #include "irqs.h"
0028 #include <asm/irq.h>
0029
0030 #include <linux/platform_data/usb-ohci-s3c2410.h>
0031 #include "devs.h"
0032
0033 #include "bast.h"
0034 #include "simtec.h"
0035
0036 /* control power and monitor over-current events on various Simtec
0037  * designed boards.
0038 */
0039
0040 static unsigned int power_state[2];
0041
0042 static void
0043 usb_simtec_powercontrol(int port, int to)
0044 {
0045     pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
0046
0047     power_state[port] = to;
0048
0049     if (power_state[0] && power_state[1])
0050         gpio_set_value(S3C2410_GPB(4), 0);
0051     else
0052         gpio_set_value(S3C2410_GPB(4), 1);
0053 }
0054
0055 static irqreturn_t
0056 usb_simtec_ocirq(int irq, void *pw)
0057 {
0058     struct s3c2410_hcd_info *info = pw;
0059
0060     if (gpio_get_value(S3C2410_GPG(10)) == 0) {
0061         pr_debug("usb_simtec: over-current irq (oc detected)\n");
0062         s3c2410_usb_report_oc(info, 3);
0063     } else {
0064         pr_debug("usb_simtec: over-current irq (oc cleared)\n");
0065         s3c2410_usb_report_oc(info, 0);
0066     }
0067
0068     return IRQ_HANDLED;
0069 }
0070
0071 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
0072 {
0073     int ret;
0074
0075     if (on) {
0076         ret = request_irq(BAST_IRQ_USBOC, usb_simtec_ocirq,
0077                   IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
0078                   "USB Over-current", info);
0079         if (ret != 0) {
0080             printk(KERN_ERR "failed to request usb oc irq\n");
0081         }
0082     } else {
0083         free_irq(BAST_IRQ_USBOC, info);
0084     }
0085 }
0086
0087 static struct s3c2410_hcd_info usb_simtec_info __initdata = {
0088     .port[0]    = {
0089         .flags  = S3C_HCDFLG_USED
0090     },
0091     .port[1]    = {
0092         .flags  = S3C_HCDFLG_USED
0093     },
0094
0095     .power_control  = usb_simtec_powercontrol,
0096     .enable_oc  = usb_simtec_enableoc,
0097 };
0098
0099
0100 int __init usb_simtec_init(void)
0101 {
0102     int ret;
0103
0104     printk("USB Power Control, Copyright 2004 Simtec Electronics\n");
0105
0106     ret = gpio_request(S3C2410_GPB(4), "USB power control");
0107     if (ret < 0) {
0108         pr_err("%s: failed to get GPB4\n", __func__);
0109         return ret;
0110     }
0111
0112     ret = gpio_request(S3C2410_GPG(10), "USB overcurrent");
0113     if (ret < 0) {
0114         pr_err("%s: failed to get GPG10\n", __func__);
0115         gpio_free(S3C2410_GPB(4));
0116         return ret;
0117     }
0118
0119     /* turn power on */
0120     gpio_direction_output(S3C2410_GPB(4), 1);
0121     gpio_direction_input(S3C2410_GPG(10));
0122
0123     s3c_ohci_set_platdata(&usb_simtec_info);
0124     return 0;
0125 }