omap4_panda: Initialize the USB phy

During misc_init_r, make sure to setup the clocks
properly for the USB hub on the pandaboard.  With
this in place, the USB hub and the ethernet works
on the pandaboard.

Signed-off-by: Chris Lalancette <clalancette@gmail.com>
Acked-by: Aneesh V <aneesh@ti.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/board/ti/panda/panda.c b/board/ti/panda/panda.c
index b4271fb..fc8c0b4 100644
--- a/board/ti/panda/panda.c
+++ b/board/ti/panda/panda.c
@@ -24,15 +24,21 @@
 #include <common.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/mmc_host_def.h>
+#include <asm/arch/clocks.h>
+#include <asm/arch/gpio.h>
 
 #include "panda_mux_data.h"
 
+#define PANDA_ULPI_PHY_TYPE_GPIO       182
+
 DECLARE_GLOBAL_DATA_PTR;
 
 const struct omap_sysinfo sysinfo = {
 	"Board: OMAP4 Panda\n"
 };
 
+struct omap4_scrm_regs *const scrm = (struct omap4_scrm_regs *)0x4a30a000;
+
 /**
  * @brief board_init
  *
@@ -62,6 +68,59 @@ int board_eth_init(bd_t *bis)
  */
 int misc_init_r(void)
 {
+	int phy_type;
+	u32 auxclk, altclksrc;
+
+	/* EHCI is not supported on ES1.0 */
+	if (omap_revision() == OMAP4430_ES1_0)
+		return 0;
+
+	gpio_direction_input(PANDA_ULPI_PHY_TYPE_GPIO);
+	phy_type = gpio_get_value(PANDA_ULPI_PHY_TYPE_GPIO);
+
+	if (phy_type == 1) {
+		/* ULPI PHY supplied by auxclk3 derived from sys_clk */
+		debug("ULPI PHY supplied by auxclk3\n");
+
+		auxclk = readl(&scrm->auxclk3);
+		/* Select sys_clk */
+		auxclk &= ~AUXCLK_SRCSELECT_MASK;
+		auxclk |=  AUXCLK_SRCSELECT_SYS_CLK << AUXCLK_SRCSELECT_SHIFT;
+		/* Set the divisor to 2 */
+		auxclk &= ~AUXCLK_CLKDIV_MASK;
+		auxclk |= AUXCLK_CLKDIV_2 << AUXCLK_CLKDIV_SHIFT;
+		/* Request auxilary clock #3 */
+		auxclk |= AUXCLK_ENABLE_MASK;
+
+		writel(auxclk, &scrm->auxclk3);
+       } else {
+		/* ULPI PHY supplied by auxclk1 derived from PER dpll */
+		debug("ULPI PHY supplied by auxclk1\n");
+
+		auxclk = readl(&scrm->auxclk1);
+		/* Select per DPLL */
+		auxclk &= ~AUXCLK_SRCSELECT_MASK;
+		auxclk |=  AUXCLK_SRCSELECT_PER_DPLL << AUXCLK_SRCSELECT_SHIFT;
+		/* Set the divisor to 16 */
+		auxclk &= ~AUXCLK_CLKDIV_MASK;
+		auxclk |= AUXCLK_CLKDIV_16 << AUXCLK_CLKDIV_SHIFT;
+		/* Request auxilary clock #3 */
+		auxclk |= AUXCLK_ENABLE_MASK;
+
+		writel(auxclk, &scrm->auxclk1);
+	}
+
+	altclksrc = readl(&scrm->altclksrc);
+
+	/* Activate alternate system clock supplier */
+	altclksrc &= ~ALTCLKSRC_MODE_MASK;
+	altclksrc |= ALTCLKSRC_MODE_ACTIVE;
+
+	/* enable clocks */
+	altclksrc |= ALTCLKSRC_ENABLE_INT_MASK | ALTCLKSRC_ENABLE_EXT_MASK;
+
+	writel(altclksrc, &scrm->altclksrc);
+
 	return 0;
 }