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>

1 files changed, 30 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")