457 lines
10 KiB
C
457 lines
10 KiB
C
/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* TI DA8xx (OMAP-L1x) Bus Glue
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*
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* Derived from: ohci-omap.c and ohci-s3c2410.c
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* Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <mach/da8xx.h>
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#include <mach/usb.h>
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#ifndef CONFIG_ARCH_DAVINCI_DA8XX
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#error "This file is DA8xx bus glue. Define CONFIG_ARCH_DAVINCI_DA8XX."
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#endif
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#define CFGCHIP2 DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG)
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static struct clk *usb11_clk;
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static struct clk *usb20_clk;
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/* Over-current indicator change bitmask */
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static volatile u16 ocic_mask;
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static void ohci_da8xx_clock(int on)
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{
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u32 cfgchip2;
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cfgchip2 = __raw_readl(CFGCHIP2);
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if (on) {
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clk_enable(usb11_clk);
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/*
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* If USB 1.1 reference clock is sourced from USB 2.0 PHY, we
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* need to enable the USB 2.0 module clocking, start its PHY,
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* and not allow it to stop the clock during USB 2.0 suspend.
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*/
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if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX)) {
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clk_enable(usb20_clk);
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cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN);
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cfgchip2 |= CFGCHIP2_PHY_PLLON;
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__raw_writel(cfgchip2, CFGCHIP2);
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pr_info("Waiting for USB PHY clock good...\n");
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while (!(__raw_readl(CFGCHIP2) & CFGCHIP2_PHYCLKGD))
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cpu_relax();
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}
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/* Enable USB 1.1 PHY */
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cfgchip2 |= CFGCHIP2_USB1SUSPENDM;
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} else {
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clk_disable(usb11_clk);
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if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX))
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clk_disable(usb20_clk);
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/* Disable USB 1.1 PHY */
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cfgchip2 &= ~CFGCHIP2_USB1SUSPENDM;
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}
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__raw_writel(cfgchip2, CFGCHIP2);
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}
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/*
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* Handle the port over-current indicator change.
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*/
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static void ohci_da8xx_ocic_handler(struct da8xx_ohci_root_hub *hub,
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unsigned port)
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{
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ocic_mask |= 1 << port;
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/* Once over-current is detected, the port needs to be powered down */
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if (hub->get_oci(port) > 0)
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hub->set_power(port, 0);
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}
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static int ohci_da8xx_init(struct usb_hcd *hcd)
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{
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev->platform_data;
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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int result;
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u32 rh_a;
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dev_dbg(dev, "starting USB controller\n");
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ohci_da8xx_clock(1);
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/*
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* DA8xx only have 1 port connected to the pins but the HC root hub
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* register A reports 2 ports, thus we'll have to override it...
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*/
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ohci->num_ports = 1;
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result = ohci_init(ohci);
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if (result < 0)
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return result;
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/*
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* Since we're providing a board-specific root hub port power control
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* and over-current reporting, we have to override the HC root hub A
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* register's default value, so that ohci_hub_control() could return
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* the correct hub descriptor...
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*/
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rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
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if (hub->set_power) {
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rh_a &= ~RH_A_NPS;
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rh_a |= RH_A_PSM;
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}
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if (hub->get_oci) {
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rh_a &= ~RH_A_NOCP;
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rh_a |= RH_A_OCPM;
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}
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rh_a &= ~RH_A_POTPGT;
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rh_a |= hub->potpgt << 24;
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ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
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return result;
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}
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static void ohci_da8xx_stop(struct usb_hcd *hcd)
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{
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ohci_stop(hcd);
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ohci_da8xx_clock(0);
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}
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static int ohci_da8xx_start(struct usb_hcd *hcd)
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{
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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int result;
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result = ohci_run(ohci);
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if (result < 0)
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ohci_da8xx_stop(hcd);
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return result;
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}
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/*
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* Update the status data from the hub with the over-current indicator change.
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*/
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static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf)
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{
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int length = ohci_hub_status_data(hcd, buf);
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/* See if we have OCIC bit set on port 1 */
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if (ocic_mask & (1 << 1)) {
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dev_dbg(hcd->self.controller, "over-current indicator change "
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"on port 1\n");
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if (!length)
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length = 1;
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buf[0] |= 1 << 1;
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}
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return length;
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}
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/*
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* Look at the control requests to the root hub and see if we need to override.
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*/
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static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
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u16 wIndex, char *buf, u16 wLength)
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{
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struct device *dev = hcd->self.controller;
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struct da8xx_ohci_root_hub *hub = dev->platform_data;
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int temp;
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switch (typeReq) {
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case GetPortStatus:
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/* Check the port number */
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if (wIndex != 1)
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break;
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dev_dbg(dev, "GetPortStatus(%u)\n", wIndex);
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temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1);
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/* The port power status (PPS) bit defaults to 1 */
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if (hub->get_power && hub->get_power(wIndex) == 0)
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temp &= ~RH_PS_PPS;
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/* The port over-current indicator (POCI) bit is always 0 */
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if (hub->get_oci && hub->get_oci(wIndex) > 0)
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temp |= RH_PS_POCI;
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/* The over-current indicator change (OCIC) bit is 0 too */
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if (ocic_mask & (1 << wIndex))
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temp |= RH_PS_OCIC;
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put_unaligned(cpu_to_le32(temp), (__le32 *)buf);
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return 0;
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case SetPortFeature:
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temp = 1;
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goto check_port;
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case ClearPortFeature:
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temp = 0;
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check_port:
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/* Check the port number */
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if (wIndex != 1)
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break;
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switch (wValue) {
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case USB_PORT_FEAT_POWER:
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dev_dbg(dev, "%sPortFeature(%u): %s\n",
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temp ? "Set" : "Clear", wIndex, "POWER");
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if (!hub->set_power)
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return -EPIPE;
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return hub->set_power(wIndex, temp) ? -EPIPE : 0;
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case USB_PORT_FEAT_C_OVER_CURRENT:
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dev_dbg(dev, "%sPortFeature(%u): %s\n",
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temp ? "Set" : "Clear", wIndex,
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"C_OVER_CURRENT");
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if (temp)
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ocic_mask |= 1 << wIndex;
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else
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ocic_mask &= ~(1 << wIndex);
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return 0;
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}
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}
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return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
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}
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static const struct hc_driver ohci_da8xx_hc_driver = {
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.description = hcd_name,
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.product_desc = "DA8xx OHCI",
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.hcd_priv_size = sizeof(struct ohci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ohci_irq,
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.flags = HCD_USB11 | HCD_MEMORY,
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/*
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* basic lifecycle operations
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*/
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.reset = ohci_da8xx_init,
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.start = ohci_da8xx_start,
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.stop = ohci_da8xx_stop,
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.shutdown = ohci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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.urb_enqueue = ohci_urb_enqueue,
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.urb_dequeue = ohci_urb_dequeue,
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.endpoint_disable = ohci_endpoint_disable,
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/*
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* scheduling support
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*/
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.get_frame_number = ohci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ohci_da8xx_hub_status_data,
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.hub_control = ohci_da8xx_hub_control,
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#ifdef CONFIG_PM
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.bus_suspend = ohci_bus_suspend,
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.bus_resume = ohci_bus_resume,
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#endif
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.start_port_reset = ohci_start_port_reset,
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};
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/*-------------------------------------------------------------------------*/
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/**
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* usb_hcd_da8xx_probe - initialize DA8xx-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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static int usb_hcd_da8xx_probe(const struct hc_driver *driver,
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struct platform_device *pdev)
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{
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struct da8xx_ohci_root_hub *hub = pdev->dev.platform_data;
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struct usb_hcd *hcd;
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struct resource *mem;
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int error, irq;
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if (hub == NULL)
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return -ENODEV;
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usb11_clk = clk_get(&pdev->dev, "usb11");
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if (IS_ERR(usb11_clk))
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return PTR_ERR(usb11_clk);
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usb20_clk = clk_get(&pdev->dev, "usb20");
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if (IS_ERR(usb20_clk)) {
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error = PTR_ERR(usb20_clk);
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goto err0;
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}
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hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
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if (!hcd) {
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error = -ENOMEM;
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goto err1;
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}
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem) {
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error = -ENODEV;
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goto err2;
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}
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hcd->rsrc_start = mem->start;
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hcd->rsrc_len = resource_size(mem);
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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dev_dbg(&pdev->dev, "request_mem_region failed\n");
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error = -EBUSY;
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goto err2;
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}
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hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
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if (!hcd->regs) {
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dev_err(&pdev->dev, "ioremap failed\n");
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error = -ENOMEM;
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goto err3;
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}
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ohci_hcd_init(hcd_to_ohci(hcd));
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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error = -ENODEV;
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goto err4;
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}
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error = usb_add_hcd(hcd, irq, IRQF_DISABLED);
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if (error)
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goto err4;
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if (hub->ocic_notify) {
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error = hub->ocic_notify(ohci_da8xx_ocic_handler);
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if (!error)
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return 0;
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}
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usb_remove_hcd(hcd);
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err4:
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iounmap(hcd->regs);
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err3:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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err2:
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usb_put_hcd(hcd);
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err1:
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clk_put(usb20_clk);
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err0:
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clk_put(usb11_clk);
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return error;
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}
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/**
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* usb_hcd_da8xx_remove - shutdown processing for DA8xx-based HCDs
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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 usb_hcd_da8xx_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 inline void
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usb_hcd_da8xx_remove(struct usb_hcd *hcd, struct platform_device *pdev)
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{
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struct da8xx_ohci_root_hub *hub = pdev->dev.platform_data;
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hub->ocic_notify(NULL);
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usb_remove_hcd(hcd);
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iounmap(hcd->regs);
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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usb_put_hcd(hcd);
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clk_put(usb20_clk);
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clk_put(usb11_clk);
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}
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static int ohci_hcd_da8xx_drv_probe(struct platform_device *dev)
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{
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return usb_hcd_da8xx_probe(&ohci_da8xx_hc_driver, dev);
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}
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static int ohci_hcd_da8xx_drv_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_hcd_da8xx_remove(hcd, dev);
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platform_set_drvdata(dev, NULL);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ohci_da8xx_suspend(struct platform_device *dev, pm_message_t message)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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if (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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ohci_da8xx_clock(0);
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hcd->state = HC_STATE_SUSPENDED;
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dev->dev.power.power_state = PMSG_SUSPEND;
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return 0;
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}
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static int ohci_da8xx_resume(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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if (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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ohci_da8xx_clock(1);
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dev->dev.power.power_state = PMSG_ON;
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usb_hcd_resume_root_hub(hcd);
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return 0;
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}
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#endif
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/*
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* Driver definition to register with platform structure.
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*/
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static struct platform_driver ohci_hcd_da8xx_driver = {
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.probe = ohci_hcd_da8xx_drv_probe,
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.remove = ohci_hcd_da8xx_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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#ifdef CONFIG_PM
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.suspend = ohci_da8xx_suspend,
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.resume = ohci_da8xx_resume,
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#endif
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.driver = {
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.owner = THIS_MODULE,
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.name = "ohci",
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},
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};
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