omap1: omap_udc: Add clocking and disable vbus sense for omap7xx
The l3_ocpi_ck clock is needed on omap7xx processors for USB.
Additionally, bit 8 of the SOFT_REQ_REG needs to be enabled for
the usb_dc_ck on omap7xx, which is a different bit than that
of the omap16xx-defined clock of the same name.
I added a provision for the usb_dc_ck and l3_ocpi_ck clocks as
dc_clk and hhc_clk, respectively, for omap7xx CPUs. Additionally,
I added a check in machine_without_vbus_sense for all omap7xx
devices, as presently I know of no omap7xx-based devices that
have vbus sense, and it made more sense to me to use a cpu check
here than to spell out each machine one at a time. Finally, DMA
is disabled for omap7xx, as it causes problems with these chips.
Cc: linux-usb@vger.kernel.org
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Cory Maccarrone <darkstar6262@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index b836efe..f81e4f0 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -2098,6 +2098,7 @@
|| machine_is_omap_h4()
#endif
|| machine_is_sx1()
+ || cpu_is_omap7xx() /* No known omap7xx boards with vbus sense */
);
}
@@ -2838,6 +2839,16 @@
udelay(100);
}
+ if (cpu_is_omap7xx()) {
+ dc_clk = clk_get(&pdev->dev, "usb_dc_ck");
+ hhc_clk = clk_get(&pdev->dev, "l3_ocpi_ck");
+ BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
+ /* can't use omap_udc_enable_clock yet */
+ clk_enable(dc_clk);
+ clk_enable(hhc_clk);
+ udelay(100);
+ }
+
INFO("OMAP UDC rev %d.%d%s\n",
omap_readw(UDC_REV) >> 4, omap_readw(UDC_REV) & 0xf,
config->otg ? ", Mini-AB" : "");
@@ -2970,7 +2981,7 @@
goto cleanup3;
}
#endif
- if (cpu_is_omap16xx()) {
+ if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
udc->dc_clk = dc_clk;
udc->hhc_clk = hhc_clk;
clk_disable(hhc_clk);
@@ -3008,7 +3019,7 @@
if (xceiv)
otg_put_transceiver(xceiv);
- if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
+ if (cpu_is_omap16xx() || cpu_is_omap24xx() || cpu_is_omap7xx()) {
clk_disable(hhc_clk);
clk_disable(dc_clk);
clk_put(hhc_clk);
@@ -3115,6 +3126,10 @@
static int __init udc_init(void)
{
+ /* Disable DMA for omap7xx -- it doesn't work right. */
+ if (cpu_is_omap7xx())
+ use_dma = 0;
+
INFO("%s, version: " DRIVER_VERSION
#ifdef USE_ISO
" (iso)"