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>

5 files changed, 44 insertions, 9 deletions

diff --git a/arch/arm/mach-omap1/Kconfig b/arch/arm/mach-omap1/Kconfig
index 55ecc01ea206..323272651933 100644
--- a/arch/arm/mach-omap1/Kconfig
+++ b/arch/arm/mach-omap1/Kconfig
@@ -11,6 +11,7 @@ config ARCH_OMAP850
         depends on ARCH_OMAP1
         bool "OMAP850 Based System"
         select CPU_ARM926T
+        select ARCH_OMAP_OTG
 
 config ARCH_OMAP15XX
         depends on ARCH_OMAP1
diff --git a/arch/arm/mach-omap1/clock.c b/arch/arm/mach-omap1/clock.c
index 7b146c06ca8a..42cbe203da36 100644
--- a/arch/arm/mach-omap1/clock.c
+++ b/arch/arm/mach-omap1/clock.c
@@ -99,7 +99,7 @@ static struct omap_clk omap_clks[] = {
         /* CK_GEN3 clocks */
         CLK(NULL,       "tc_ck",        &tc_ck.clk,     CK_16XX | CK_1510 | CK_310 | CK_7XX),
         CLK(NULL,       "tipb_ck",      &tipb_ck,       CK_1510 | CK_310),
-        CLK(NULL,       "l3_ocpi_ck",   &l3_ocpi_ck,    CK_16XX),
+        CLK(NULL,       "l3_ocpi_ck",   &l3_ocpi_ck,    CK_16XX | CK_7XX),
         CLK(NULL,       "tc1_ck",       &tc1_ck,        CK_16XX),
         CLK(NULL,       "tc2_ck",       &tc2_ck,        CK_16XX),
         CLK(NULL,       "dma_ck",       &dma_ck,        CK_16XX | CK_1510 | CK_310),
@@ -120,6 +120,7 @@ static struct omap_clk omap_clks[] = {
         CLK(NULL,       "usb_hhc_ck",   &usb_hhc_ck1510, CK_1510 | CK_310),
         CLK(NULL,       "usb_hhc_ck",   &usb_hhc_ck16xx, CK_16XX),
         CLK(NULL,       "usb_dc_ck",    &usb_dc_ck,     CK_16XX),
+        CLK(NULL,       "usb_dc_ck",    &usb_dc_ck7xx,  CK_7XX),
         CLK(NULL,       "mclk",         &mclk_1510,     CK_1510 | CK_310),
         CLK(NULL,       "mclk",         &mclk_16xx,     CK_16XX),
         CLK(NULL,       "bclk",         &bclk_1510,     CK_1510 | CK_310),
diff --git a/arch/arm/mach-omap1/clock.h b/arch/arm/mach-omap1/clock.h
index fac921c00bfe..29ffa97dc7f3 100644
--- a/arch/arm/mach-omap1/clock.h
+++ b/arch/arm/mach-omap1/clock.h
@@ -574,6 +574,16 @@ static struct clk usb_dc_ck = {
         .enable_bit     = 4,
 };
 
+static struct clk usb_dc_ck7xx = {
+        .name           = "usb_dc_ck",
+        .ops            = &clkops_generic,
+        /* Direct from ULPD, no parent */
+        .rate           = 48000000,
+        .flags          = RATE_FIXED,
+        .enable_reg     = OMAP1_IO_ADDRESS(SOFT_REQ_REG),
+        .enable_bit     = 8,
+};
+
 static struct clk mclk_1510 = {
         .name           = "mclk",
         .ops            = &clkops_generic,
diff --git a/arch/arm/plat-omap/usb.c b/arch/arm/plat-omap/usb.c
index 0ea1e0beb455..51033a4503c3 100644
--- a/arch/arm/plat-omap/usb.c
+++ b/arch/arm/plat-omap/usb.c
@@ -159,11 +159,14 @@ static u32 __init omap_usb0_init(unsigned nwires, unsigned is_device)
                  *  - OTG support on this port not yet written
                  */
 
-                l = omap_readl(USB_TRANSCEIVER_CTRL);
-                l &= ~(7 << 4);
-                if (!is_device)
-                        l |= (3 << 1);
-                omap_writel(l, USB_TRANSCEIVER_CTRL);
+                /* Don't do this for omap7xx -- it causes USB to not work correctly */
+                if (!cpu_is_omap7xx()) {
+                        l = omap_readl(USB_TRANSCEIVER_CTRL);
+                        l &= ~(7 << 4);
+                        if (!is_device)
+                                l |= (3 << 1);
+                        omap_writel(l, USB_TRANSCEIVER_CTRL);
+                }
 
                 return 3 << 16;
         }
@@ -603,7 +606,12 @@ omap_otg_init(struct omap_usb_config *config)
         if (config->otg || config->register_dev) {
                 syscon &= ~DEV_IDLE_EN;
                 udc_device.dev.platform_data = config;
-                /* FIXME patch IRQ numbers for omap730 */
+                /* IRQ numbers for omap7xx */
+                if(cpu_is_omap7xx()) {
+                        udc_resources[1].start = INT_7XX_USB_GENI;
+                        udc_resources[2].start = INT_7XX_USB_NON_ISO;
+                        udc_resources[3].start = INT_7XX_USB_ISO;
+                }
                 status = platform_device_register(&udc_device);
                 if (status)
                         pr_debug("can't register UDC device, %d\n", status);
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)"