| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 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 <mach/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 | |
| 40 | static unsigned int power_state[2]; |
| 41 | |
| 42 | static void |
| 43 | usb_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 | |
| 55 | static irqreturn_t |
| 56 | usb_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 | |
| 71 | static 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 | |
| 87 | static 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 | |
| 100 | int __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 | } |