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>

1 files changed, 17 insertions, 2 deletions

diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index b836efe9ea71..f81e4f025f23 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -2098,6 +2098,7 @@ static inline int machine_without_vbus_sense(void)
                 || machine_is_omap_h4()
 #endif
                 || machine_is_sx1()
+                || cpu_is_omap7xx() /* No known omap7xx boards with vbus sense */
                 );
 }
 
@@ -2838,6 +2839,16 @@ static int __init omap_udc_probe(struct platform_device *pdev)
                 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 @@ known:
                 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 @@ cleanup0:
         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 struct platform_driver udc_driver = {
 
 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)"