USB: AM35x: Add musb support

AM35x has musb interface (version 1.8) and uses CPPI41 DMA engine.
It has USB phy built inside the IP itself.

Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-omap@vger.kernel.org
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 55 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/board-am3517evm.c b/arch/arm/mach-omap2/board-am3517evm.c
index 4d0f58592864..9ac9de6bb970 100644
--- a/arch/arm/mach-omap2/board-am3517evm.c
+++ b/arch/arm/mach-omap2/board-am3517evm.c
@@ -375,6 +375,31 @@ static void __init am3517_evm_init_irq(void)
         omap_gpio_init();
 }
 
+static struct omap_musb_board_data musb_board_data = {
+        .interface_type         = MUSB_INTERFACE_ULPI,
+        .mode                   = MUSB_OTG,
+        .power                  = 500,
+};
+
+static __init void am3517_evm_musb_init(void)
+{
+        u32 devconf2;
+
+        /*
+         * Set up USB clock/mode in the DEVCONF2 register.
+         */
+        devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
+
+        /* USB2.0 PHY reference clock is 13 MHz */
+        devconf2 &= ~(CONF2_REFFREQ | CONF2_OTGMODE | CONF2_PHY_GPIOMODE);
+        devconf2 |=  CONF2_REFFREQ_13MHZ | CONF2_SESENDEN | CONF2_VBDTCTEN
+                        | CONF2_DATPOL;
+
+        omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
+
+        usb_musb_init(&musb_board_data);
+}
+
 static const struct ehci_hcd_omap_platform_data ehci_pdata __initconst = {
         .port_mode[0] = EHCI_HCD_OMAP_MODE_PHY,
 #if defined(CONFIG_PANEL_SHARP_LQ043T1DG01) || \
@@ -393,6 +418,8 @@ static const struct ehci_hcd_omap_platform_data ehci_pdata __initconst = {
 
 #ifdef CONFIG_OMAP_MUX
 static struct omap_board_mux board_mux[] __initdata = {
+        /* USB OTG DRVVBUS offset = 0x212 */
+        OMAP3_MUX(SAD2D_MCAD23, OMAP_MUX_MODE0 | OMAP_PIN_INPUT_PULLDOWN),
         { .reg_offset = OMAP_MUX_TERMINATOR },
 };
 #else
@@ -459,6 +486,9 @@ static void __init am3517_evm_init(void)
                                 ARRAY_SIZE(am3517evm_i2c1_boardinfo));
         /*Ethernet*/
         am3517_evm_ethernet_init(&am3517_evm_emac_pdata);
+
+        /* MUSB */
+        am3517_evm_musb_init();
 }
 
 MACHINE_START(OMAP3517EVM, "OMAP3517/AM3517 EVM")
diff --git a/arch/arm/mach-omap2/usb-musb.c b/arch/arm/mach-omap2/usb-musb.c
index 33a5cde1c227..72605584bfff 100644
--- a/arch/arm/mach-omap2/usb-musb.c
+++ b/arch/arm/mach-omap2/usb-musb.c
@@ -28,6 +28,7 @@
 
 #include <mach/hardware.h>
 #include <mach/irqs.h>
+#include <mach/am35xx.h>
 #include <plat/usb.h>
 
 #ifdef CONFIG_USB_MUSB_SOC
@@ -89,6 +90,9 @@ void __init usb_musb_init(struct omap_musb_board_data *board_data)
 {
         if (cpu_is_omap243x()) {
                 musb_resources[0].start = OMAP243X_HS_BASE;
+        } else if (cpu_is_omap3517() || cpu_is_omap3505()) {
+                musb_resources[0].start = AM35XX_IPSS_USBOTGSS_BASE;
+                musb_resources[1].start = INT_35XX_USBOTG_IRQ;
         } else if (cpu_is_omap34xx()) {
                 musb_resources[0].start = OMAP34XX_HSUSB_OTG_BASE;
         } else if (cpu_is_omap44xx()) {
diff --git a/arch/arm/plat-omap/include/plat/usb.h b/arch/arm/plat-omap/include/plat/usb.h
index 2a9427c8cc48..9feddacfe850 100644
--- a/arch/arm/plat-omap/include/plat/usb.h
+++ b/arch/arm/plat-omap/include/plat/usb.h
@@ -218,6 +218,27 @@ static inline omap2_usbfs_init(struct omap_usb_config *pdata)
 #       define  USBT2TLL5PI             (1 << 17)
 #       define  USB0PUENACTLOI          (1 << 16)
 #       define  USBSTANDBYCTRL          (1 << 15)
+/* AM35x */
+/* USB 2.0 PHY Control */
+#define CONF2_PHY_GPIOMODE      (1 << 23)
+#define CONF2_OTGMODE           (3 << 14)
+#define CONF2_NO_OVERRIDE       (0 << 14)
+#define CONF2_FORCE_HOST        (1 << 14)
+#define CONF2_FORCE_DEVICE      (2 << 14)
+#define CONF2_FORCE_HOST_VBUS_LOW (3 << 14)
+#define CONF2_SESENDEN          (1 << 13)
+#define CONF2_VBDTCTEN          (1 << 12)
+#define CONF2_REFFREQ_24MHZ     (2 << 8)
+#define CONF2_REFFREQ_26MHZ     (7 << 8)
+#define CONF2_REFFREQ_13MHZ     (6 << 8)
+#define CONF2_REFFREQ           (0xf << 8)
+#define CONF2_PHYCLKGD          (1 << 7)
+#define CONF2_VBUSSENSE         (1 << 6)
+#define CONF2_PHY_PLLON         (1 << 5)
+#define CONF2_RESET             (1 << 4)
+#define CONF2_PHYPWRDN          (1 << 3)
+#define CONF2_OTGPWRDN          (1 << 2)
+#define CONF2_DATPOL            (1 << 1)
 
 #if defined(CONFIG_ARCH_OMAP1) && defined(CONFIG_USB)
 u32 omap1_usb0_init(unsigned nwires, unsigned is_device);