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USB: pxa27x_udc: compatibility with pxa320 SoC 

Got pxa27x_udc working on the pxa320 Nomad platform.  The
problem was that the pxa3xx UDC is not quite compatible with
the pxa27x UDC in how it handles back-to-back control
packets.  The pxa27x probably drops them by default, but the
pxa320 does not, and you have to detect it and set the OPC
bit to clear the zero-length packet.

Signed-off-by: Aric Blumer <aric@sdgsystems.com>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Robert Jarzmik 2009-04-21 20:34:44 -07:00 committed by Greg Kroah-Hartman
parent f6d529f936
commit 9f5351b743
2 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/usb/gadget/Kconfig
View File

@ -253,7 +253,7 @@ config USB_PXA25X_SMALL
config USB_GADGET_PXA27X
boolean "PXA 27x"
depends on ARCH_PXA && PXA27x
depends on ARCH_PXA && (PXA27x || PXA3xx)
select USB_OTG_UTILS
help
Intel's PXA 27x series XScale ARM v5TE processors include

13
drivers/usb/gadget/pxa27x_udc.c
View File

@ -1892,6 +1892,15 @@ static void handle_ep0_ctrl_req(struct pxa_udc *udc,
nuke(ep, -EPROTO);
/*
* In the PXA320 manual, in the section about Back-to-Back setup
* packets, it describes this situation. The solution is to set OPC to
* get rid of the status packet, and then continue with the setup
* packet. Generalize to pxa27x CPUs.
*/
if (epout_has_pkt(ep) && (ep_count_bytes_remain(ep) == 0))
udc_ep_writel(ep, UDCCSR, UDCCSR0_OPC);
/* read SETUP packet */
for (i = 0; i < 2; i++) {
if (unlikely(ep_is_empty(ep)))
@ -1965,6 +1974,8 @@ stall:
* cleared by software.
* - clearing UDCCSR0_OPC always flushes ep0. If in setup stage, never do it
* before reading ep0.
* This is true only for PXA27x. This is not true anymore for PXA3xx family
* (check Back-to-Back setup packet in developers guide).
* - irq can be called on a "packet complete" event (opc_irq=1), while
* UDCCSR0_OPC is not yet raised (delta can be as big as 100ms
* from experimentation).
@ -2575,7 +2586,7 @@ static struct platform_driver udc_driver = {
static int __init udc_init(void)
{
if (!cpu_is_pxa27x())
if (!cpu_is_pxa27x() && !cpu_is_pxa3xx())
return -ENODEV;
printk(KERN_INFO "%s: version %s\n", driver_name, DRIVER_VERSION);