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usb: dwc2: add 'mode' which based on Kconfig select or dts setting 

According to the "dr_mode", the otg controller can work as
device role and host role. Some boards always want to use host mode
and some other boards want to use gadget mode. We use the dts setting
to set dwc2's mode, rather than fixing it to whatever hardware says.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Tested-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kever Yang 2014-08-06 09:01:50 +08:00 committed by Greg Kroah-Hartman
parent fc1b0e2aa3
commit c0155b9d5e
3 changed files with 27 additions and 0 deletions
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18
drivers/usb/dwc2/core.c
View File

@ -118,6 +118,7 @@ static int dwc2_core_reset(struct dwc2_hsotg *hsotg)
{
u32 greset;
int count = 0;
u32 gusbcfg;
dev_vdbg(hsotg->dev, "%s()\n", __func__);
@ -148,6 +149,23 @@ static int dwc2_core_reset(struct dwc2_hsotg *hsotg)
}
} while (greset & GRSTCTL_CSFTRST);
if (hsotg->dr_mode == USB_DR_MODE_HOST) {
gusbcfg = readl(hsotg->regs + GUSBCFG);
gusbcfg &= ~GUSBCFG_FORCEDEVMODE;
gusbcfg |= GUSBCFG_FORCEHOSTMODE;
writel(gusbcfg, hsotg->regs + GUSBCFG);
} else if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) {
gusbcfg = readl(hsotg->regs + GUSBCFG);
gusbcfg &= ~GUSBCFG_FORCEHOSTMODE;
gusbcfg |= GUSBCFG_FORCEDEVMODE;
writel(gusbcfg, hsotg->regs + GUSBCFG);
} else if (hsotg->dr_mode == USB_DR_MODE_OTG) {
gusbcfg = readl(hsotg->regs + GUSBCFG);
gusbcfg &= ~GUSBCFG_FORCEHOSTMODE;
gusbcfg &= ~GUSBCFG_FORCEDEVMODE;
writel(gusbcfg, hsotg->regs + GUSBCFG);
}
/*
* NOTE: This long sleep is _very_ important, otherwise the core will
* not stay in host mode after a connector ID change!

5
drivers/usb/dwc2/core.h
View File

@ -501,6 +501,10 @@ struct dwc2_hw_params {
* a_peripheral and b_device=>b_host) this may not match
* the core, but allows the software to determine
* transitions
* @dr_mode: Requested mode of operation, one of following:
* - USB_DR_MODE_PERIPHERAL
* - USB_DR_MODE_HOST
* - USB_DR_MODE_OTG
* @queuing_high_bandwidth: True if multiple packets of a high-bandwidth
* transfer are in process of being queued
* @srp_success: Stores status of SRP request in the case of a FS PHY
@ -592,6 +596,7 @@ struct dwc2_hsotg {
/** Params to actually use */
struct dwc2_core_params *core_params;
enum usb_otg_state op_state;
enum usb_dr_mode dr_mode;
unsigned int queuing_high_bandwidth:1;
unsigned int srp_success:1;

4
drivers/usb/dwc2/platform.c
View File

@ -42,6 +42,8 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/usb/of.h>
#include "core.h"
#include "hcd.h"
@ -200,6 +202,8 @@ static int dwc2_driver_probe(struct platform_device *dev)
dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
(unsigned long)res->start, hsotg->regs);
hsotg->dr_mode = of_usb_get_dr_mode(dev->dev.of_node);
retval = dwc2_hcd_init(hsotg, irq, params);
if (retval)
return retval;