Texas Instruments DA830/OMAP-L137 OHCI glue layer.
This OHCI implementation is not without quirks: there's only one physical port
despite the root hub reporting two; the port's power control and over-current
status bits are not connected to any pins, however, at least on the DA830 EVM
board, those signals are connected via GPIO, thus the provision was made for
overriding the OHCI port power and over-current bits at the board level...
Signed-off-by: Mikhail Cherkashin <mcherkashin@xxxxxxxxxxxxx>
Signed-off-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>
---
The patch is against the recent DaVinci tree.
arch/arm/mach-davinci/include/mach/usb.h | 20 +
drivers/usb/Kconfig | 1
drivers/usb/host/ohci-da830.c | 456 +++++++++++++++++++++++++++++++
drivers/usb/host/ohci-hcd.c | 5
4 files changed, 482 insertions(+)
Index: linux-davinci/drivers/usb/Kconfig
===================================================================
--- linux-davinci.orig/drivers/usb/Kconfig
+++ linux-davinci/drivers/usb/Kconfig
@@ -38,6 +38,7 @@ config USB_ARCH_HAS_OHCI
default y if ARCH_AT91
default y if ARCH_PNX4008 && I2C
default y if MFD_TC6393XB
+ default y if ARCH_DAVINCI_DA830
# PPC:
default y if STB03xxx
default y if PPC_MPC52xx
Index: linux-davinci/drivers/usb/host/ohci-da830.c
===================================================================
--- /dev/null
+++ linux-davinci/drivers/usb/host/ohci-da830.c
@@ -0,0 +1,456 @@
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * TI DA830 (OMAP-L137) Bus Glue
+ *
+ * Derived from: ohci-omap.c and ohci-s3c2410.c
+ * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@xxxxxxxxxx>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+#include <asm/hardware.h>
+#include <asm/arch/usb.h>
+
+#ifndef CONFIG_ARCH_DAVINCI_DA830
+#error "This file is DA830 bus glue. Define CONFIG_ARCH_DAVINCI_DA830."
+#endif
+
+#define CFGCHIP2 IO_ADDRESS(DA830_CFGCHIP(2))
+
+static struct clk *usb11_clk;
+static struct clk *usb20_clk;
+
+/* Over-current indicator change bitmask */
+static volatile u16 ocic_mask;
+
+static void ohci_da830_clock(int on)
+{
+ u32 cfgchip2;
+
+ cfgchip2 = __raw_readl(CFGCHIP2);
+ if (on) {
+ clk_enable(usb11_clk);
+
+ /*
+ * If USB 1.1 reference clock is sourced from USB 2.0 PHY, we
+ * need to enable the USB 2.0 module clocking, start its PHY,
+ * and not allow it to stop the clock during USB 2.0 suspend.
+ */
+ if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX)) {
+ clk_enable(usb20_clk);
+
+ cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN);
+ cfgchip2 |= CFGCHIP2_PHY_PLLON;
+ __raw_writel(cfgchip2, CFGCHIP2);
+
+ pr_info("Waiting for USB PHY clock good...\n");
+ while (!(__raw_readl(CFGCHIP2) & CFGCHIP2_PHYCLKGD))
+ cpu_relax();
+ }
+
+ /* Enable USB 1.1 PHY */
+ cfgchip2 |= CFGCHIP2_USB1SUSPENDM;
+ } else {
+ clk_disable(usb11_clk);
+ if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX))
+ clk_disable(usb20_clk);
+
+ /* Disable USB 1.1 PHY */
+ cfgchip2 &= ~CFGCHIP2_USB1SUSPENDM;
+ }
+ __raw_writel(cfgchip2, CFGCHIP2);
+}
+
+/*
+ * Handle the port over-current indicator change.
+ */
+static void ohci_da830_ocic_handler(struct da830_ohci_root_hub *hub,
+ unsigned port)
+{
+ ocic_mask |= 1 << port;
+
+ /* Once over-current is detected, the port needs to be powered down */
+ if (hub->get_oci(port) > 0)
+ hub->set_power(port, 0);
+}
+
+static int ohci_da830_init(struct usb_hcd *hcd)
+{
+ struct device *dev = hcd->self.controller;
+ struct da830_ohci_root_hub *hub = dev->platform_data;
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ int result;
+ u32 rh_a;
+
+ dev_dbg(dev, "starting USB controller\n");
+
+ ohci_da830_clock(1);
+
+ /*
+ * DA830 only has 1 port connected to the pins but its HC root hub
+ * register A reports 2 ports, thus we'll have to override it...
+ */
+ ohci->num_ports = 1;
+
+ result = ohci_init(ohci);
+ if (result < 0)
+ return result;
+
+ /*
+ * Since we're providing a board-specific root hub port power control
+ * and over-current reporting, we have to override the HC root hub A
+ * register's default value, so that ohci_hub_control() could return
+ * the correct hub descriptor...
+ */
+ rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
+ if (hub->set_power) {
+ rh_a &= ~RH_A_NPS;
+ rh_a |= RH_A_PSM;
+ }
+ if (hub->get_oci) {
+ rh_a &= ~RH_A_NOCP;
+ rh_a |= RH_A_OCPM;
+ }
+ rh_a &= ~RH_A_POTPGT;
+ rh_a |= hub->potpgt << 24;
+ ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
+
+ return result;
+}
+
+static void ohci_da830_stop(struct usb_hcd *hcd)
+{
+ ohci_stop(hcd);
+ ohci_da830_clock(0);
+}
+
+static int ohci_da830_start(struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ int result;
+
+ result = ohci_run(ohci);
+ if (result < 0)
+ ohci_da830_stop(hcd);
+
+ return result;
+}
+
+/*
+ * Update the status data from the hub with the over-current indicator change.
+ */
+static int ohci_da830_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+ int length = ohci_hub_status_data(hcd, buf);
+
+ /* See if we have OCIC bit set on port 1 */
+ if (ocic_mask & (1 << 1)) {
+ dev_dbg(hcd->self.controller, "over-current indicator change "
+ "on port 1\n");
+
+ if (!length)
+ length = 1;
+
+ buf[0] |= 1 << 1;
+ }
+ return length;
+}
+
+/*
+ * Look at the control requests to the root hub and see if we need to override.
+ */
+static int ohci_da830_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
+ u16 wIndex, char *buf, u16 wLength)
+{
+ struct device *dev = hcd->self.controller;
+ struct da830_ohci_root_hub *hub = dev->platform_data;
+ int temp;
+
+ switch (typeReq) {
+ case GetPortStatus:
+ /* Check the port number */
+ if (wIndex != 1)
+ break;
+
+ dev_dbg(dev, "GetPortStatus(%u)\n", wIndex);
+
+ temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1);
+
+ /* The port power status (PPS) bit defaults to 1 */
+ if (hub->get_power && hub->get_power(wIndex) == 0)
+ temp &= ~RH_PS_PPS;
+
+ /* The port over-current indicator (POCI) bit is always 0 */
+ if (hub->get_oci && hub->get_oci(wIndex) > 0)
+ temp |= RH_PS_POCI;
+
+ /* The over-current indicator change (OCIC) bit is 0 too */
+ if (ocic_mask & (1 << wIndex))
+ temp |= RH_PS_OCIC;
+
+ put_unaligned(cpu_to_le32(temp), (__le32 *)buf);
+ return 0;
+ case SetPortFeature:
+ temp = 1;
+ goto check_port;
+ case ClearPortFeature:
+ temp = 0;
+
+check_port:
+ /* Check the port number */
+ if (wIndex != 1)
+ break;
+
+ switch (wValue) {
+ case USB_PORT_FEAT_POWER:
+ dev_dbg(dev, "%sPortFeature(%u): %s\n",
+ temp ? "Set" : "Clear", wIndex, "POWER");
+
+ if (!hub->set_power)
+ return -EPIPE;
+
+ return hub->set_power(wIndex, temp) ? -EPIPE : 0;
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ dev_dbg(dev, "%sPortFeature(%u): %s\n",
+ temp ? "Set" : "Clear", wIndex,
+ "C_OVER_CURRENT");
+
+ if (temp)
+ ocic_mask |= 1 << wIndex;
+ else
+ ocic_mask &= ~(1 << wIndex);
+ return 0;
+ }
+ }
+
+ return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
+}
+
+/*
+ * We don't have OTG but the Mentor USB core in DA830 does have it, so we
+ * have to define an empty function to silence the warning in ohci-hcd.c...
+ */
+#ifdef CONFIG_USB_OTG
+static void start_hnp(struct ohci_hcd *ohci) {}
+#endif
+
+static const struct hc_driver ohci_da830_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "DA830 OHCI",
+ .hcd_priv_size = sizeof(struct ohci_hcd),
+
+ /*
+ * generic hardware linkage
+ */
+ .irq = ohci_irq,
+ .flags = HCD_USB11 | HCD_MEMORY,
+
+ /*
+ * basic lifecycle operations
+ */
+ .reset = ohci_da830_init,
+ .start = ohci_da830_start,
+ .stop = ohci_da830_stop,
+ .shutdown = ohci_shutdown,
+
+ /*
+ * managing i/o requests and associated device resources
+ */
+ .urb_enqueue = ohci_urb_enqueue,
+ .urb_dequeue = ohci_urb_dequeue,
+ .endpoint_disable = ohci_endpoint_disable,
+
+ /*
+ * scheduling support
+ */
+ .get_frame_number = ohci_get_frame,
+
+ /*
+ * root hub support
+ */
+ .hub_status_data = ohci_da830_hub_status_data,
+ .hub_control = ohci_da830_hub_control,
+ .hub_irq_enable = ohci_rhsc_enable,
+#ifdef CONFIG_PM
+ .bus_suspend = ohci_bus_suspend,
+ .bus_resume = ohci_bus_resume,
+#endif
+ .start_port_reset = ohci_start_port_reset,
+};
+
+/*-------------------------------------------------------------------------*/
+
+
+/**
+ * usb_hcd_da830_probe - initialize DA830-based HCDs
+ * Context: !in_interrupt()
+ *
+ * Allocates basic resources for this USB host controller, and
+ * then invokes the start() method for the HCD associated with it
+ * through the hotplug entry's driver_data.
+ */
+static int usb_hcd_da830_probe(const struct hc_driver *driver,
+ struct platform_device *pdev)
+{
+ struct da830_ohci_root_hub *hub = pdev->dev.platform_data;
+ struct usb_hcd *hcd;
+ struct resource *mem;
+ int error, irq;
+
+ if (hub == NULL)
+ return -ENODEV;
+
+ usb11_clk = clk_get(&pdev->dev, "USB11CLK");
+ if (IS_ERR(usb11_clk))
+ return PTR_ERR(usb11_clk);
+
+ usb20_clk = clk_get(&pdev->dev, "USB20CLK");
+ if (IS_ERR(usb20_clk)) {
+ error = PTR_ERR(usb20_clk);
+ goto err0;
+ }
+
+ hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
+ if (!hcd) {
+ error = -ENOMEM;
+ goto err1;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ error = -ENODEV;
+ goto err2;
+ }
+ hcd->rsrc_start = mem->start;
+ hcd->rsrc_len = mem->end - mem->start + 1;
+
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+ dev_dbg(&pdev->dev, "request_mem_region failed\n");
+ error = -EBUSY;
+ goto err2;
+ }
+
+ hcd->regs = (void __iomem *)(long)IO_ADDRESS(hcd->rsrc_start);
+
+ ohci_hcd_init(hcd_to_ohci(hcd));
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ error = -ENODEV;
+ goto err3;
+ }
+ error = usb_add_hcd(hcd, irq, IRQF_DISABLED);
+ if (error)
+ goto err4;
+
+ if (hub->ocic_notify) {
+ error = hub->ocic_notify(ohci_da830_ocic_handler);
+ if (!error)
+ return 0;
+ }
+err4:
+ usb_remove_hcd(hcd);
+err3:
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err2:
+ usb_put_hcd(hcd);
+err1:
+ clk_put(usb20_clk);
+err0:
+ clk_put(usb11_clk);
+ return error;
+}
+
+/**
+ * usb_hcd_da830_remove - shutdown processing for DA830-based HCDs
+ * @dev: USB Host Controller being removed
+ * Context: !in_interrupt()
+ *
+ * Reverses the effect of usb_hcd_da830_probe(), first invoking
+ * the HCD's stop() method. It is always called from a thread
+ * context, normally "rmmod", "apmd", or something similar.
+ */
+static inline void
+usb_hcd_da830_remove(struct usb_hcd *hcd, struct platform_device *pdev)
+{
+ struct da830_ohci_root_hub *hub = pdev->dev.platform_data;
+
+ hub->ocic_notify(NULL);
+ usb_remove_hcd(hcd);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ usb_put_hcd(hcd);
+ clk_put(usb20_clk);
+ clk_put(usb11_clk);
+}
+
+static int ohci_hcd_da830_drv_probe(struct platform_device *dev)
+{
+ return usb_hcd_da830_probe(&ohci_da830_hc_driver, dev);
+}
+
+static int ohci_hcd_da830_drv_remove(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+
+ usb_hcd_da830_remove(hcd, dev);
+ platform_set_drvdata(dev, NULL);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int ohci_da830_suspend(struct platform_device *dev, pm_message_t message)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+
+ if (time_before(jiffies, ohci->next_statechange))
+ msleep(5);
+ ohci->next_statechange = jiffies;
+
+ ohci_da830_clock(0);
+ hcd->state = HC_STATE_SUSPENDED;
+ dev->dev.power.power_state = PMSG_SUSPEND;
+ return 0;
+}
+
+static int ohci_da830_resume(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+
+ if (time_before(jiffies, ohci->next_statechange))
+ msleep(5);
+ ohci->next_statechange = jiffies;
+
+ ohci_da830_clock(1);
+ dev->dev.power.power_state = PMSG_ON;
+ usb_hcd_resume_root_hub(hcd);
+ return 0;
+}
+#endif
+
+/*
+ * Driver definition to register with platform structure.
+ */
+static struct platform_driver ohci_hcd_da830_driver = {
+ .probe = ohci_hcd_da830_drv_probe,
+ .remove = ohci_hcd_da830_drv_remove,
+ .shutdown = usb_hcd_platform_shutdown,
+#ifdef CONFIG_PM
+ .suspend = ohci_da830_suspend,
+ .resume = ohci_da830_resume,
+#endif
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "ohci",
+ },
+};
Index: linux-davinci/drivers/usb/host/ohci-hcd.c
===================================================================
--- linux-davinci.orig/drivers/usb/host/ohci-hcd.c
+++ linux-davinci/drivers/usb/host/ohci-hcd.c
@@ -1047,6 +1047,11 @@ MODULE_LICENSE ("GPL");
#define PLATFORM_DRIVER usb_hcd_pnx4008_driver
#endif
+#ifdef CONFIG_ARCH_DAVINCI_DA830
+#include "ohci-da830.c"
+#define PLATFORM_DRIVER ohci_hcd_da830_driver
+#endif
+
#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
defined(CONFIG_CPU_SUBTYPE_SH7721) || \
defined(CONFIG_CPU_SUBTYPE_SH7763) || \
Index: linux-davinci/arch/arm/mach-davinci/include/mach/usb.h
===================================================================
--- linux-davinci.orig/arch/arm/mach-davinci/include/mach/usb.h
+++ linux-davinci/arch/arm/mach-davinci/include/mach/usb.h
@@ -37,4 +37,24 @@
#define CFGCHIP2_REFFREQ_24MHZ (2 << 0)
#define CFGCHIP2_REFFREQ_48MHZ (3 << 0)
+struct da830_ohci_root_hub;
+
+typedef void (*da830_ocic_handler_t)(struct da830_ohci_root_hub *hub,
+ unsigned port);
+
+/* Passed as the platform data to the OHCI driver */
+struct da830_ohci_root_hub {
+ /* Switch the port power on/off */
+ int (*set_power)(unsigned port, int on);
+ /* Read the port power status */
+ int (*get_power)(unsigned port);
+ /* Read the port over-current indicator */
+ int (*get_oci)(unsigned port);
+ /* Over-current indicator change notification (pass NULL to disable) */
+ int (*ocic_notify)(da830_ocic_handler_t handler);
+
+ /* Time from power on to power good (in 2 ms units) */
+ u8 potpgt;
+};
+
#endif /* ifndef __ASM_ARCH_USB_H */
--
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