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usb: dwc2: Add functions to check the HW OTG config

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Added functions to query the GHWCFG2.OTG_MODE. This tells us whether the
controller hardware is configured for OTG, device-only, or host-only.

Signed-off-by: John Youn <johnyoun@synopsys.com>
Tested-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
John Youn
2015-12-17 11:16:17 -08:00
committed by Felipe Balbi
parent b5d308abef
commit 6bea962053
2 changed files with 50 additions and 0 deletions
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37
drivers/usb/dwc2/core.c
View File

@ -3342,6 +3342,43 @@ void dwc2_disable_global_interrupts(struct dwc2_hsotg *hsotg)
dwc2_writel(ahbcfg, hsotg->regs + GAHBCFG);
}
/* Returns the controller's GHWCFG2.OTG_MODE. */
unsigned dwc2_op_mode(struct dwc2_hsotg *hsotg)
{
u32 ghwcfg2 = dwc2_readl(hsotg->regs + GHWCFG2);
return (ghwcfg2 & GHWCFG2_OP_MODE_MASK) >>
GHWCFG2_OP_MODE_SHIFT;
}
/* Returns true if the controller is capable of DRD. */
bool dwc2_hw_is_otg(struct dwc2_hsotg *hsotg)
{
unsigned op_mode = dwc2_op_mode(hsotg);
return (op_mode == GHWCFG2_OP_MODE_HNP_SRP_CAPABLE) ||
(op_mode == GHWCFG2_OP_MODE_SRP_ONLY_CAPABLE) ||
(op_mode == GHWCFG2_OP_MODE_NO_HNP_SRP_CAPABLE);
}
/* Returns true if the controller is host-only. */
bool dwc2_hw_is_host(struct dwc2_hsotg *hsotg)
{
unsigned op_mode = dwc2_op_mode(hsotg);
return (op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_HOST) ||
(op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST);
}
/* Returns true if the controller is device-only. */
bool dwc2_hw_is_device(struct dwc2_hsotg *hsotg)
{
unsigned op_mode = dwc2_op_mode(hsotg);
return (op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE) ||
(op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE);
}
MODULE_DESCRIPTION("DESIGNWARE HS OTG Core");
MODULE_AUTHOR("Synopsys, Inc.");
MODULE_LICENSE("Dual BSD/GPL");

13
drivers/usb/dwc2/core.h
View File

@ -1137,6 +1137,19 @@ extern int dwc2_get_hwparams(struct dwc2_hsotg *hsotg);
extern int dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg);
extern int dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg);
/*
* The following functions check the controller's OTG operation mode
* capability (GHWCFG2.OTG_MODE).
*
* These functions can be used before the internal hsotg->hw_params
* are read in and cached so they always read directly from the
* GHWCFG2 register.
*/
unsigned dwc2_op_mode(struct dwc2_hsotg *hsotg);
bool dwc2_hw_is_otg(struct dwc2_hsotg *hsotg);
bool dwc2_hw_is_host(struct dwc2_hsotg *hsotg);
bool dwc2_hw_is_device(struct dwc2_hsotg *hsotg);
/*
* Dump core registers and SPRAM
*/