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usb: renesas_usbhs: add support for USB-DMAC

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Some Renesas SoCs have the USB-DMAC. It is able to terminate transfers
when a short packet is received, even if less bytes than the transfer
counter size have been received. Also, it is able to send a short
packet even if the packet size is not multiples of 8bytes.

Since the previous code has used the interruption of USBHS controller
when receiving packets even if this driver has used a dmac, a lot of
interruptions has happened. This patch will reduce such interruptions.

This patch allows to use the USB-DMAC on R-Car H2 and M2.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Yoshihiro Shimoda
2015-03-12 15:35:20 +09:00
committed by Felipe Balbi
parent 9b53d9af7a
commit ab330cf388
7 changed files with 228 additions and 6 deletions
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19
drivers/usb/renesas_usbhs/common.c
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@@ -275,6 +275,16 @@ int usbhs_set_device_config(struct usbhs_priv *priv, int devnum,
return 0;
}
/*
* interrupt functions
*/
void usbhs_xxxsts_clear(struct usbhs_priv *priv, u16 sts_reg, u16 bit)
{
u16 pipe_mask = (u16)GENMASK(usbhs_get_dparam(priv, pipe_size), 0);
usbhs_write(priv, sts_reg, ~(1 << bit) & pipe_mask);
}
/*
* local functions
*/
@@ -487,6 +497,15 @@ static struct renesas_usbhs_platform_info *usbhs_parse_dt(struct device *dev)
if (gpio > 0)
dparam->enable_gpio = gpio;
switch (dparam->type) {
case USBHS_TYPE_R8A7790:
case USBHS_TYPE_R8A7791:
dparam->has_usb_dmac = 1;
break;
default:
break;
}
return info;
}