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504 lines
11 KiB
504 lines
11 KiB
// 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 <[email protected]> |
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* (C) Copyright 2000-2002 David Brownell <[email protected]> |
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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 <[email protected]> |
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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, <[email protected]> |
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* Copyright (C) 2004 Simtec Electronics |
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* |
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* Thanks to [email protected] 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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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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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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* |
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* Context: task context, might sleep |
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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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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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* @dev: USB Host Controller to be probed |
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* |
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* Context: task context, might sleep |
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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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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, irq; |
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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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irq = platform_get_irq(dev, 0); |
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if (irq < 0) { |
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retval = irq; |
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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, irq, 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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