[U-Boot] [PATCH v2] omap4_panda: Initialize the USB phy

[clalancette at gmail.com]

From: Chris Lalancette <clalancette at gmail.com>

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 at gmail.com>
---
v2: Incorporate changes from Aneesh (aneesh at ti.com) to support
    USB PHY from sys_clk and PER dpll.  Also use symbolic
    constants instead of magic values.

 arch/arm/include/asm/arch-omap4/clocks.h |   63 ++++++++++++++++++++++++++++++
 board/ti/panda/panda.c                   |   59 ++++++++++++++++++++++++++++
 2 files changed, 122 insertions(+), 0 deletions(-)

diff --git a/arch/arm/include/asm/arch-omap4/clocks.h b/arch/arm/include/asm/arch-omap4/clocks.h
index c2a9b46..cd304e8 100644
--- a/arch/arm/include/asm/arch-omap4/clocks.h
+++ b/arch/arm/include/asm/arch-omap4/clocks.h
@@ -470,6 +470,47 @@ struct omap4_prcm_regs {
 
 };
 
+struct omap4_scrm_regs {
+	u32 revision;		/* 0x0000 */
+	u32 pad00[63];
+	u32 clksetuptime;	/* 0x0100 */
+	u32 pmicsetuptime;	/* 0x0104 */
+	u32 pad01[2];
+	u32 altclksrc;		/* 0x0110 */
+	u32 pad02[2];
+	u32 c2cclkm;		/* 0x011c */
+	u32 pad03[56];
+	u32 extclkreq;		/* 0x0200 */
+	u32 accclkreq;		/* 0x0204 */
+	u32 pwrreq;		/* 0x0208 */
+	u32 pad04[1];
+	u32 auxclkreq0;		/* 0x0210 */
+	u32 auxclkreq1;		/* 0x0214 */
+	u32 auxclkreq2;		/* 0x0218 */
+	u32 auxclkreq3;		/* 0x021c */
+	u32 auxclkreq4;		/* 0x0220 */
+	u32 auxclkreq5;		/* 0x0224 */
+	u32 pad05[3];
+	u32 c2cclkreq;		/* 0x0234 */
+	u32 pad06[54];
+	u32 auxclk0;		/* 0x0310 */
+	u32 auxclk1;		/* 0x0314 */
+	u32 auxclk2;		/* 0x0318 */
+	u32 auxclk3;		/* 0x031c */
+	u32 auxclk4;		/* 0x0320 */
+	u32 auxclk5;		/* 0x0324 */
+	u32 pad07[54];
+	u32 rsttime_reg;	/* 0x0400 */
+	u32 pad08[6];
+	u32 c2crstctrl;		/* 0x041c */
+	u32 extpwronrstctrl;	/* 0x0420 */
+	u32 pad09[59];
+	u32 extwarmrstst_reg;	/* 0x0510 */
+	u32 apewarmrstst_reg;	/* 0x0514 */
+	u32 pad10[1];
+	u32 c2cwarmrstst_reg;	/* 0x051C */
+};
+
 /* DPLL register offsets */
 #define CM_CLKMODE_DPLL		0
 #define CM_IDLEST_DPLL		0x4
@@ -652,6 +693,28 @@ struct omap4_prcm_regs {
 #define TPS62361_BASE_VOLT_MV	500
 #define TPS62361_VSEL0_GPIO	7
 
+/* AUXCLKx reg fields */
+#define AUXCLK_ENABLE_MASK		(1 << 8)
+#define AUXCLK_SRCSELECT_SHIFT		1
+#define AUXCLK_SRCSELECT_MASK		(3 << 1)
+#define AUXCLK_CLKDIV_SHIFT		16
+#define AUXCLK_CLKDIV_MASK		(0xF << 16)
+
+#define AUXCLK_SRCSELECT_SYS_CLK	0
+#define AUXCLK_SRCSELECT_CORE_DPLL	1
+#define AUXCLK_SRCSELECT_PER_DPLL	2
+#define AUXCLK_SRCSELECT_ALTERNATE	3
+
+#define AUXCLK_CLKDIV_2			1
+#define AUXCLK_CLKDIV_16		0xF
+
+/* ALTCLKSRC */
+#define ALTCLKSRC_MODE_MASK		3
+#define ALTCLKSRC_ENABLE_INT_MASK	4
+#define ALTCLKSRC_ENABLE_EXT_MASK	8
+
+#define ALTCLKSRC_MODE_ACTIVE		1
+
 /* Defines for DPLL setup */
 #define DPLL_LOCKED_FREQ_TOLERANCE_0		0
 #define DPLL_LOCKED_FREQ_TOLERANCE_500_KHZ	500
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;
 }
 
-- 
1.7.1