linux/drivers/usb/host/ohci-omap.c
Martin Blumenstingl 4e88d4c083 usb: add a flag to skip PHY initialization to struct usb_hcd
The USB HCD core driver parses the device-tree node for "phys" and
"usb-phys" properties. It also manages the power state of these PHYs
automatically.
However, drivers may opt-out of this behavior by setting "phy" or
"usb_phy" in struct usb_hcd to a non-null value. An example where this
is required is the "Qualcomm USB2 controller", implemented by the
chipidea driver. The hardware requires that the PHY is only powered on
after the "reset completed" event from the controller is received.

A follow-up patch will allow the USB HCD core driver to manage more than
one PHY. Add a new "skip_phy_initialization" bitflag to struct usb_hcd
so drivers can opt-out of any PHY management provided by the USB HCD
core driver.

This also updates the existing drivers so they use the new flag if they
want to opt out of the PHY management provided by the USB HCD core
driver. This means that for these drivers the new "multiple PHY"
handling (which will be added in a follow-up patch) will be disabled as
well.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
Tested-by: Neil Armstrong <narmstrong@baylibre.con>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-09 09:43:52 -08:00

497 lines
12 KiB
C

// SPDX-License-Identifier: GPL-1.0+
/*
* OHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
* (C) Copyright 2000-2005 David Brownell
* (C) Copyright 2002 Hewlett-Packard Company
*
* OMAP Bus Glue
*
* Modified for OMAP by Tony Lindgren <tony@atomide.com>
* Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc.
* and on ohci-sa1111.c by Christopher Hoover <ch@hpl.hp.com>
*
* This file is licenced under the GPL.
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb/otg.h>
#include <linux/platform_device.h>
#include <linux/signal.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ohci.h"
#include <asm/io.h>
#include <asm/mach-types.h>
#include <mach/mux.h>
#include <mach/hardware.h>
#include <mach/usb.h>
/* OMAP-1510 OHCI has its own MMU for DMA */
#define OMAP1510_LB_MEMSIZE 32 /* Should be same as SDRAM size */
#define OMAP1510_LB_CLOCK_DIV 0xfffec10c
#define OMAP1510_LB_MMU_CTL 0xfffec208
#define OMAP1510_LB_MMU_LCK 0xfffec224
#define OMAP1510_LB_MMU_LD_TLB 0xfffec228
#define OMAP1510_LB_MMU_CAM_H 0xfffec22c
#define OMAP1510_LB_MMU_CAM_L 0xfffec230
#define OMAP1510_LB_MMU_RAM_H 0xfffec234
#define OMAP1510_LB_MMU_RAM_L 0xfffec238
#define DRIVER_DESC "OHCI OMAP driver"
#ifdef CONFIG_TPS65010
#include <linux/mfd/tps65010.h>
#else
#define LOW 0
#define HIGH 1
#define GPIO1 1
static inline int tps65010_set_gpio_out_value(unsigned gpio, unsigned value)
{
return 0;
}
#endif
static struct clk *usb_host_ck;
static struct clk *usb_dc_ck;
static const char hcd_name[] = "ohci-omap";
static struct hc_driver __read_mostly ohci_omap_hc_driver;
static void omap_ohci_clock_power(int on)
{
if (on) {
clk_enable(usb_dc_ck);
clk_enable(usb_host_ck);
/* guesstimate for T5 == 1x 32K clock + APLL lock time */
udelay(100);
} else {
clk_disable(usb_host_ck);
clk_disable(usb_dc_ck);
}
}
/*
* Board specific gang-switched transceiver power on/off.
* NOTE: OSK supplies power from DC, not battery.
*/
static int omap_ohci_transceiver_power(int on)
{
if (on) {
if (machine_is_omap_innovator() && cpu_is_omap1510())
__raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
| ((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
INNOVATOR_FPGA_CAM_USB_CONTROL);
else if (machine_is_omap_osk())
tps65010_set_gpio_out_value(GPIO1, LOW);
} else {
if (machine_is_omap_innovator() && cpu_is_omap1510())
__raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
& ~((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
INNOVATOR_FPGA_CAM_USB_CONTROL);
else if (machine_is_omap_osk())
tps65010_set_gpio_out_value(GPIO1, HIGH);
}
return 0;
}
#ifdef CONFIG_ARCH_OMAP15XX
/*
* OMAP-1510 specific Local Bus clock on/off
*/
static int omap_1510_local_bus_power(int on)
{
if (on) {
omap_writel((1 << 1) | (1 << 0), OMAP1510_LB_MMU_CTL);
udelay(200);
} else {
omap_writel(0, OMAP1510_LB_MMU_CTL);
}
return 0;
}
/*
* OMAP-1510 specific Local Bus initialization
* NOTE: This assumes 32MB memory size in OMAP1510LB_MEMSIZE.
* See also arch/mach-omap/memory.h for __virt_to_dma() and
* __dma_to_virt() which need to match with the physical
* Local Bus address below.
*/
static int omap_1510_local_bus_init(void)
{
unsigned int tlb;
unsigned long lbaddr, physaddr;
omap_writel((omap_readl(OMAP1510_LB_CLOCK_DIV) & 0xfffffff8) | 0x4,
OMAP1510_LB_CLOCK_DIV);
/* Configure the Local Bus MMU table */
for (tlb = 0; tlb < OMAP1510_LB_MEMSIZE; tlb++) {
lbaddr = tlb * 0x00100000 + OMAP1510_LB_OFFSET;
physaddr = tlb * 0x00100000 + PHYS_OFFSET;
omap_writel((lbaddr & 0x0fffffff) >> 22, OMAP1510_LB_MMU_CAM_H);
omap_writel(((lbaddr & 0x003ffc00) >> 6) | 0xc,
OMAP1510_LB_MMU_CAM_L);
omap_writel(physaddr >> 16, OMAP1510_LB_MMU_RAM_H);
omap_writel((physaddr & 0x0000fc00) | 0x300, OMAP1510_LB_MMU_RAM_L);
omap_writel(tlb << 4, OMAP1510_LB_MMU_LCK);
omap_writel(0x1, OMAP1510_LB_MMU_LD_TLB);
}
/* Enable the walking table */
omap_writel(omap_readl(OMAP1510_LB_MMU_CTL) | (1 << 3), OMAP1510_LB_MMU_CTL);
udelay(200);
return 0;
}
#else
#define omap_1510_local_bus_power(x) {}
#define omap_1510_local_bus_init() {}
#endif
#ifdef CONFIG_USB_OTG
static void start_hnp(struct ohci_hcd *ohci)
{
struct usb_hcd *hcd = ohci_to_hcd(ohci);
const unsigned port = hcd->self.otg_port - 1;
unsigned long flags;
u32 l;
otg_start_hnp(hcd->usb_phy->otg);
local_irq_save(flags);
hcd->usb_phy->otg->state = OTG_STATE_A_SUSPEND;
writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
l = omap_readl(OTG_CTRL);
l &= ~OTG_A_BUSREQ;
omap_writel(l, OTG_CTRL);
local_irq_restore(flags);
}
#endif
/*-------------------------------------------------------------------------*/
static int ohci_omap_reset(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
struct omap_usb_config *config = dev_get_platdata(hcd->self.controller);
int need_transceiver = (config->otg != 0);
int ret;
dev_dbg(hcd->self.controller, "starting USB Controller\n");
if (config->otg) {
hcd->self.otg_port = config->otg;
/* default/minimum OTG power budget: 8 mA */
hcd->power_budget = 8;
}
/* boards can use OTG transceivers in non-OTG modes */
need_transceiver = need_transceiver
|| machine_is_omap_h2() || machine_is_omap_h3();
/* XXX OMAP16xx only */
if (config->ocpi_enable)
config->ocpi_enable();
#ifdef CONFIG_USB_OTG
if (need_transceiver) {
hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
int status = otg_set_host(hcd->usb_phy->otg,
&ohci_to_hcd(ohci)->self);
dev_dbg(hcd->self.controller, "init %s phy, status %d\n",
hcd->usb_phy->label, status);
if (status) {
usb_put_phy(hcd->usb_phy);
return status;
}
} else {
return -EPROBE_DEFER;
}
hcd->skip_phy_initialization = 1;
ohci->start_hnp = start_hnp;
}
#endif
omap_ohci_clock_power(1);
if (cpu_is_omap15xx()) {
omap_1510_local_bus_power(1);
omap_1510_local_bus_init();
}
ret = ohci_setup(hcd);
if (ret < 0)
return ret;
if (config->otg || config->rwc) {
ohci->hc_control = OHCI_CTRL_RWC;
writel(OHCI_CTRL_RWC, &ohci->regs->control);
}
/* board-specific power switching and overcurrent support */
if (machine_is_omap_osk() || machine_is_omap_innovator()) {
u32 rh = roothub_a (ohci);
/* power switching (ganged by default) */
rh &= ~RH_A_NPS;
/* TPS2045 switch for internal transceiver (port 1) */
if (machine_is_omap_osk()) {
ohci_to_hcd(ohci)->power_budget = 250;
rh &= ~RH_A_NOCP;
/* gpio9 for overcurrent detction */
omap_cfg_reg(W8_1610_GPIO9);
gpio_request(9, "OHCI overcurrent");
gpio_direction_input(9);
/* for paranoia's sake: disable USB.PUEN */
omap_cfg_reg(W4_USB_HIGHZ);
}
ohci_writel(ohci, rh, &ohci->regs->roothub.a);
ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
} else if (machine_is_nokia770()) {
/* We require a self-powered hub, which should have
* plenty of power. */
ohci_to_hcd(ohci)->power_budget = 0;
}
/* FIXME hub_wq hub requests should manage power switching */
omap_ohci_transceiver_power(1);
/* board init will have already handled HMC and mux setup.
* any external transceiver should already be initialized
* too, so all configured ports use the right signaling now.
*/
return 0;
}
/*-------------------------------------------------------------------------*/
/**
* ohci_hcd_omap_probe - initialize OMAP-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 ohci_hcd_omap_probe(struct platform_device *pdev)
{
int retval, irq;
struct usb_hcd *hcd = 0;
if (pdev->num_resources != 2) {
dev_err(&pdev->dev, "invalid num_resources: %i\n",
pdev->num_resources);
return -ENODEV;
}
if (pdev->resource[0].flags != IORESOURCE_MEM
|| pdev->resource[1].flags != IORESOURCE_IRQ) {
dev_err(&pdev->dev, "invalid resource type\n");
return -ENODEV;
}
usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck");
if (IS_ERR(usb_host_ck))
return PTR_ERR(usb_host_ck);
if (!cpu_is_omap15xx())
usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
else
usb_dc_ck = clk_get(&pdev->dev, "lb_ck");
if (IS_ERR(usb_dc_ck)) {
clk_put(usb_host_ck);
return PTR_ERR(usb_dc_ck);
}
hcd = usb_create_hcd(&ohci_omap_hc_driver, &pdev->dev,
dev_name(&pdev->dev));
if (!hcd) {
retval = -ENOMEM;
goto err0;
}
hcd->rsrc_start = pdev->resource[0].start;
hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
dev_dbg(&pdev->dev, "request_mem_region failed\n");
retval = -EBUSY;
goto err1;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (!hcd->regs) {
dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
retval = -ENOMEM;
goto err2;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
retval = -ENXIO;
goto err3;
}
retval = usb_add_hcd(hcd, irq, 0);
if (retval)
goto err3;
device_wakeup_enable(hcd->self.controller);
return 0;
err3:
iounmap(hcd->regs);
err2:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
usb_put_hcd(hcd);
err0:
clk_put(usb_dc_ck);
clk_put(usb_host_ck);
return retval;
}
/* may be called with controller, bus, and devices active */
/**
* ohci_hcd_omap_remove - shutdown processing for OMAP-based HCDs
* @dev: USB Host Controller being removed
* Context: !in_interrupt()
*
* Reverses the effect of ohci_hcd_omap_probe(), first invoking
* the HCD's stop() method. It is always called from a thread
* context, normally "rmmod", "apmd", or something similar.
*/
static int ohci_hcd_omap_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
dev_dbg(hcd->self.controller, "stopping USB Controller\n");
usb_remove_hcd(hcd);
omap_ohci_clock_power(0);
if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
(void) otg_set_host(hcd->usb_phy->otg, 0);
usb_put_phy(hcd->usb_phy);
}
if (machine_is_omap_osk())
gpio_free(9);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
clk_put(usb_dc_ck);
clk_put(usb_host_ck);
return 0;
}
/*-------------------------------------------------------------------------*/
#ifdef CONFIG_PM
static int ohci_omap_suspend(struct platform_device *pdev, pm_message_t message)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
bool do_wakeup = device_may_wakeup(&pdev->dev);
int ret;
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
ret = ohci_suspend(hcd, do_wakeup);
if (ret)
return ret;
omap_ohci_clock_power(0);
return ret;
}
static int ohci_omap_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;
omap_ohci_clock_power(1);
ohci_resume(hcd, false);
return 0;
}
#endif
/*-------------------------------------------------------------------------*/
/*
* Driver definition to register with the OMAP bus
*/
static struct platform_driver ohci_hcd_omap_driver = {
.probe = ohci_hcd_omap_probe,
.remove = ohci_hcd_omap_remove,
.shutdown = usb_hcd_platform_shutdown,
#ifdef CONFIG_PM
.suspend = ohci_omap_suspend,
.resume = ohci_omap_resume,
#endif
.driver = {
.name = "ohci",
},
};
static const struct ohci_driver_overrides omap_overrides __initconst = {
.product_desc = "OMAP OHCI",
.reset = ohci_omap_reset
};
static int __init ohci_omap_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides);
return platform_driver_register(&ohci_hcd_omap_driver);
}
module_init(ohci_omap_init);
static void __exit ohci_omap_cleanup(void)
{
platform_driver_unregister(&ohci_hcd_omap_driver);
}
module_exit(ohci_omap_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:ohci");
MODULE_LICENSE("GPL");