501 lines
11 KiB
C
501 lines
11 KiB
C
// SPDX-License-Identifier: GPL-1.0+
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/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
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* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
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* (C) Copyright 2002 Hewlett-Packard Company
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*
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* USB Bus Glue for Samsung S3C2410
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*
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* Written by Christopher Hoover <ch@hpl.hp.com>
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* Based on fragments of previous driver by Russell King et al.
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*
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* Modified for S3C2410 from ohci-sa1111.c, ohci-omap.c and ohci-lh7a40.c
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* by Ben Dooks, <ben@simtec.co.uk>
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* Copyright (C) 2004 Simtec Electronics
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*
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* Thanks to basprog@mail.ru for updates to newer kernels
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*
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* This file is licenced under the GPL.
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*/
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/usb-ohci-s3c2410.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "ohci.h"
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#define valid_port(idx) ((idx) == 1 || (idx) == 2)
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/* clock device associated with the hcd */
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#define DRIVER_DESC "OHCI S3C2410 driver"
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static const char hcd_name[] = "ohci-s3c2410";
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static struct clk *clk;
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static struct clk *usb_clk;
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static struct hc_driver __read_mostly ohci_s3c2410_hc_driver;
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/* forward definitions */
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static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc);
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/* conversion functions */
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static struct s3c2410_hcd_info *to_s3c2410_info(struct usb_hcd *hcd)
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{
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return dev_get_platdata(hcd->self.controller);
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}
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static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
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{
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struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
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dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
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clk_prepare_enable(usb_clk);
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mdelay(2); /* let the bus clock stabilise */
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clk_prepare_enable(clk);
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if (info != NULL) {
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info->hcd = hcd;
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info->report_oc = s3c2410_hcd_oc;
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if (info->enable_oc != NULL)
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(info->enable_oc)(info, 1);
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}
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}
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static void s3c2410_stop_hc(struct platform_device *dev)
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{
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struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
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dev_dbg(&dev->dev, "s3c2410_stop_hc:\n");
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if (info != NULL) {
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info->report_oc = NULL;
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info->hcd = NULL;
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if (info->enable_oc != NULL)
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(info->enable_oc)(info, 0);
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}
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clk_disable_unprepare(clk);
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clk_disable_unprepare(usb_clk);
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}
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/* ohci_s3c2410_hub_status_data
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*
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* update the status data from the hub with anything that
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* has been detected by our system
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*/
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static int
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ohci_s3c2410_hub_status_data(struct usb_hcd *hcd, char *buf)
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{
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struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
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struct s3c2410_hcd_port *port;
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int orig;
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int portno;
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orig = ohci_hub_status_data(hcd, buf);
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if (info == NULL)
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return orig;
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port = &info->port[0];
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/* mark any changed port as changed */
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for (portno = 0; portno < 2; port++, portno++) {
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if (port->oc_changed == 1 &&
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port->flags & S3C_HCDFLG_USED) {
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dev_dbg(hcd->self.controller,
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"oc change on port %d\n", portno);
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if (orig < 1)
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orig = 1;
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buf[0] |= 1<<(portno+1);
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}
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}
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return orig;
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}
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/* s3c2410_usb_set_power
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*
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* configure the power on a port, by calling the platform device
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* routine registered with the platform device
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*/
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static void s3c2410_usb_set_power(struct s3c2410_hcd_info *info,
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int port, int to)
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{
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if (info == NULL)
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return;
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if (info->power_control != NULL) {
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info->port[port-1].power = to;
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(info->power_control)(port-1, to);
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}
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}
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/* ohci_s3c2410_hub_control
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*
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* look at control requests to the hub, and see if we need
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* to take any action or over-ride the results from the
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* request.
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*/
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static int ohci_s3c2410_hub_control(
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struct usb_hcd *hcd,
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u16 typeReq,
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u16 wValue,
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u16 wIndex,
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char *buf,
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u16 wLength)
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{
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struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
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struct usb_hub_descriptor *desc;
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int ret = -EINVAL;
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u32 *data = (u32 *)buf;
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dev_dbg(hcd->self.controller,
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"s3c2410_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
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hcd, typeReq, wValue, wIndex, buf, wLength);
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/* if we are only an humble host without any special capabilities
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* process the request straight away and exit */
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if (info == NULL) {
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ret = ohci_hub_control(hcd, typeReq, wValue,
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wIndex, buf, wLength);
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goto out;
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}
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/* check the request to see if it needs handling */
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switch (typeReq) {
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case SetPortFeature:
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if (wValue == USB_PORT_FEAT_POWER) {
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dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
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s3c2410_usb_set_power(info, wIndex, 1);
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goto out;
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}
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break;
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case ClearPortFeature:
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switch (wValue) {
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case USB_PORT_FEAT_C_OVER_CURRENT:
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dev_dbg(hcd->self.controller,
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"ClearPortFeature: C_OVER_CURRENT\n");
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if (valid_port(wIndex)) {
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info->port[wIndex-1].oc_changed = 0;
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info->port[wIndex-1].oc_status = 0;
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}
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goto out;
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case USB_PORT_FEAT_OVER_CURRENT:
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dev_dbg(hcd->self.controller,
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"ClearPortFeature: OVER_CURRENT\n");
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if (valid_port(wIndex))
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info->port[wIndex-1].oc_status = 0;
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goto out;
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case USB_PORT_FEAT_POWER:
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dev_dbg(hcd->self.controller,
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"ClearPortFeature: POWER\n");
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if (valid_port(wIndex)) {
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s3c2410_usb_set_power(info, wIndex, 0);
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return 0;
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}
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}
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break;
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}
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ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
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if (ret)
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goto out;
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switch (typeReq) {
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case GetHubDescriptor:
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/* update the hub's descriptor */
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desc = (struct usb_hub_descriptor *)buf;
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if (info->power_control == NULL)
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return ret;
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dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
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desc->wHubCharacteristics);
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/* remove the old configurations for power-switching, and
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* over-current protection, and insert our new configuration
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*/
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desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
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desc->wHubCharacteristics |= cpu_to_le16(
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HUB_CHAR_INDV_PORT_LPSM);
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if (info->enable_oc) {
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desc->wHubCharacteristics &= ~cpu_to_le16(
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HUB_CHAR_OCPM);
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desc->wHubCharacteristics |= cpu_to_le16(
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HUB_CHAR_INDV_PORT_OCPM);
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}
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dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
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desc->wHubCharacteristics);
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return ret;
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case GetPortStatus:
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/* check port status */
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dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
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if (valid_port(wIndex)) {
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if (info->port[wIndex-1].oc_changed)
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*data |= cpu_to_le32(RH_PS_OCIC);
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if (info->port[wIndex-1].oc_status)
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*data |= cpu_to_le32(RH_PS_POCI);
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}
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}
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out:
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return ret;
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}
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/* s3c2410_hcd_oc
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*
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* handle an over-current report
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*/
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static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc)
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{
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struct s3c2410_hcd_port *port;
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struct usb_hcd *hcd;
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unsigned long flags;
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int portno;
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if (info == NULL)
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return;
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port = &info->port[0];
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hcd = info->hcd;
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local_irq_save(flags);
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for (portno = 0; portno < 2; port++, portno++) {
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if (port_oc & (1<<portno) &&
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port->flags & S3C_HCDFLG_USED) {
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port->oc_status = 1;
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port->oc_changed = 1;
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/* ok, once over-current is detected,
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the port needs to be powered down */
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s3c2410_usb_set_power(info, portno+1, 0);
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}
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}
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local_irq_restore(flags);
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}
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/* may be called without controller electrically present */
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/* may be called with controller, bus, and devices active */
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/*
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* ohci_hcd_s3c2410_remove - shutdown processing for HCD
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* @dev: USB Host Controller being removed
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* Context: !in_interrupt()
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*
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* Reverses the effect of ohci_hcd_3c2410_probe(), first invoking
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* the HCD's stop() method. It is always called from a thread
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* context, normally "rmmod", "apmd", or something similar.
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*
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*/
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static int
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ohci_hcd_s3c2410_remove(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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usb_remove_hcd(hcd);
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s3c2410_stop_hc(dev);
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usb_put_hcd(hcd);
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return 0;
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}
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/**
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* ohci_hcd_s3c2410_probe - initialize S3C2410-based HCDs
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* Context: !in_interrupt()
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*
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* Allocates basic resources for this USB host controller, and
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* then invokes the start() method for the HCD associated with it
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* through the hotplug entry's driver_data.
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*
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*/
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static int ohci_hcd_s3c2410_probe(struct platform_device *dev)
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{
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struct usb_hcd *hcd = NULL;
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struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
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int retval;
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s3c2410_usb_set_power(info, 1, 1);
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s3c2410_usb_set_power(info, 2, 1);
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hcd = usb_create_hcd(&ohci_s3c2410_hc_driver, &dev->dev, "s3c24xx");
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if (hcd == NULL)
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return -ENOMEM;
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hcd->rsrc_start = dev->resource[0].start;
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hcd->rsrc_len = resource_size(&dev->resource[0]);
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hcd->regs = devm_ioremap_resource(&dev->dev, &dev->resource[0]);
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if (IS_ERR(hcd->regs)) {
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retval = PTR_ERR(hcd->regs);
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goto err_put;
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}
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clk = devm_clk_get(&dev->dev, "usb-host");
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if (IS_ERR(clk)) {
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dev_err(&dev->dev, "cannot get usb-host clock\n");
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retval = PTR_ERR(clk);
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goto err_put;
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}
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usb_clk = devm_clk_get(&dev->dev, "usb-bus-host");
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if (IS_ERR(usb_clk)) {
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dev_err(&dev->dev, "cannot get usb-bus-host clock\n");
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retval = PTR_ERR(usb_clk);
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goto err_put;
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}
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s3c2410_start_hc(dev, hcd);
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retval = usb_add_hcd(hcd, dev->resource[1].start, 0);
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if (retval != 0)
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goto err_ioremap;
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device_wakeup_enable(hcd->self.controller);
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return 0;
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err_ioremap:
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s3c2410_stop_hc(dev);
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err_put:
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usb_put_hcd(hcd);
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return retval;
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}
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/*-------------------------------------------------------------------------*/
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#ifdef CONFIG_PM
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static int ohci_hcd_s3c2410_drv_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct platform_device *pdev = to_platform_device(dev);
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bool do_wakeup = device_may_wakeup(dev);
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int rc = 0;
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rc = ohci_suspend(hcd, do_wakeup);
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if (rc)
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return rc;
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s3c2410_stop_hc(pdev);
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return rc;
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}
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static int ohci_hcd_s3c2410_drv_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct platform_device *pdev = to_platform_device(dev);
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s3c2410_start_hc(pdev, hcd);
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ohci_resume(hcd, false);
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return 0;
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}
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#else
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#define ohci_hcd_s3c2410_drv_suspend NULL
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#define ohci_hcd_s3c2410_drv_resume NULL
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#endif
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static const struct dev_pm_ops ohci_hcd_s3c2410_pm_ops = {
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.suspend = ohci_hcd_s3c2410_drv_suspend,
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.resume = ohci_hcd_s3c2410_drv_resume,
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};
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static const struct of_device_id ohci_hcd_s3c2410_dt_ids[] = {
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{ .compatible = "samsung,s3c2410-ohci" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, ohci_hcd_s3c2410_dt_ids);
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static struct platform_driver ohci_hcd_s3c2410_driver = {
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.probe = ohci_hcd_s3c2410_probe,
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.remove = ohci_hcd_s3c2410_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "s3c2410-ohci",
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.pm = &ohci_hcd_s3c2410_pm_ops,
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.of_match_table = ohci_hcd_s3c2410_dt_ids,
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},
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};
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static int __init ohci_s3c2410_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info("%s: " DRIVER_DESC "\n", hcd_name);
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ohci_init_driver(&ohci_s3c2410_hc_driver, NULL);
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/*
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* The Samsung HW has some unusual quirks, which require
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* Sumsung-specific workarounds. We override certain hc_driver
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* functions here to achieve that. We explicitly do not enhance
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* ohci_driver_overrides to allow this more easily, since this
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* is an unusual case, and we don't want to encourage others to
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* override these functions by making it too easy.
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*/
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ohci_s3c2410_hc_driver.hub_status_data = ohci_s3c2410_hub_status_data;
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ohci_s3c2410_hc_driver.hub_control = ohci_s3c2410_hub_control;
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return platform_driver_register(&ohci_hcd_s3c2410_driver);
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}
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module_init(ohci_s3c2410_init);
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static void __exit ohci_s3c2410_cleanup(void)
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{
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platform_driver_unregister(&ohci_hcd_s3c2410_driver);
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}
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module_exit(ohci_s3c2410_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:s3c2410-ohci");
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