Up to this point, the USB phy clock configuration was handled manually in
the board files and in the usb drivers. This adds proper clocks so that
the usb drivers can use clk_get and clk_enable and not have to worry about
the details. Also, the related code is removed from the board files.

Signed-off-by: David Lechner <david@lechnology.com>
---

v2 changes: Move clock mux code to set_parent callback. Also fixed some other
issues from feedback on the previous patch.


 arch/arm/mach-davinci/board-da830-evm.c     |  12 ---
 arch/arm/mach-davinci/board-omapl138-hawk.c |   7 --
 arch/arm/mach-davinci/da830.c               | 143 ++++++++++++++++++++++++++++
 arch/arm/mach-davinci/da850.c               | 143 ++++++++++++++++++++++++++++
 4 files changed, 286 insertions(+), 19 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index 3d8cf8c..f3a8cc9 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c

@@ -115,18 +115,6 @@ static __init void da830_evm_usb_init(void)
 	 */
 	cfgchip2 = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
 
-	/* USB2.0 PHY reference clock is 24 MHz */
-	cfgchip2 &= ~CFGCHIP2_REFFREQ;
-	cfgchip2 |=  CFGCHIP2_REFFREQ_24MHZ;
-
-	/*
-	 * Select internal reference clock for USB 2.0 PHY
-	 * and use it as a clock source for USB 1.1 PHY
-	 * (this is the default setting anyway).
-	 */
-	cfgchip2 &= ~CFGCHIP2_USB1PHYCLKMUX;
-	cfgchip2 |=  CFGCHIP2_USB2PHYCLKMUX;
-
 	/*
 	 * We have to override VBUS/ID signals when MUSB is configured into the
 	 * host-only mode -- ID pin will float if no cable is connected, so the

diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
index ee62486..d27e753 100644
--- a/arch/arm/mach-davinci/board-omapl138-hawk.c
+++ b/arch/arm/mach-davinci/board-omapl138-hawk.c

@@ -251,13 +251,6 @@ static __init void omapl138_hawk_usb_init(void)
 		return;
 	}
 
-	/* Setup the Ref. clock frequency for the HAWK at 24 MHz. */
-
-	cfgchip2 = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
-	cfgchip2 &= ~CFGCHIP2_REFFREQ;
-	cfgchip2 |=  CFGCHIP2_REFFREQ_24MHZ;
-	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
-
 	ret = gpio_request_one(DA850_USB1_VBUS_PIN,
 			GPIOF_DIR_OUT, "USB1 VBUS");
 	if (ret < 0) {

diff --git a/arch/arm/mach-davinci/da830.c b/arch/arm/mach-davinci/da830.c
index 7187e7f..ee942b0 100644
--- a/arch/arm/mach-davinci/da830.c
+++ b/arch/arm/mach-davinci/da830.c

@@ -12,6 +12,7 @@
 #include <linux/init.h>
 #include <linux/clk.h>
 #include <linux/platform_data/gpio-davinci.h>
+#include <linux/platform_data/usb-davinci.h>
 
 #include <asm/mach/map.h>
 

@@ -346,6 +347,12 @@ static struct clk i2c1_clk = {
 	.gpsc		= 1,
 };
 
+static struct clk usb_ref_clk = {
+	.name		= "usb_ref_clk",
+	.rate		= 48000000,
+	.set_rate	= davinci_simple_set_rate,
+};

+
 static struct clk usb11_clk = {
 	.name		= "usb11",
 	.parent		= &pll0_sysclk4,

@@ -353,6 +360,139 @@ static struct clk usb11_clk = {
 	.gpsc		= 1,
 };
 
+static void usb20_phy_clk_enable(struct clk *clk)
+{
+	u32 val;
+
+	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	/*
+	 * Turn on the USB 2.0 PHY, but just the PLL, and not OTG. The USB 1.1
+	 * host may use the PLL clock without USB 2.0 OTG being used.
+	 */
+	val &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN);
+	val |= CFGCHIP2_PHY_PLLON;
+
+	writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	pr_info("Waiting for USB 2.0 PHY clock good...\n");
+	while (!(readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG))
+						& CFGCHIP2_PHYCLKGD))
+		cpu_relax();

+
 static struct clk emif3_clk = {
 	.name		= "emif3",
 	.parent		= &pll0_sysclk5,

@@ -420,7 +560,10 @@ static struct clk_lookup da830_clks[] = {
 	CLK("davinci_mdio.0",   "fck",          &emac_clk),
 	CLK(NULL,		"gpio",		&gpio_clk),
 	CLK("i2c_davinci.2",	NULL,		&i2c1_clk),
+	CLK(NULL,		"usb_ref_clk",	&usb_ref_clk),
 	CLK(NULL,		"usb11",	&usb11_clk),
+	CLK(NULL,		"usb20_phy",	&usb20_phy_clk),
+	CLK(NULL,		"usb11_phy",	&usb11_phy_clk),
 	CLK(NULL,		"emif3",	&emif3_clk),
 	CLK(NULL,		"arm",		&arm_clk),
 	CLK(NULL,		"rmii",		&rmii_clk),

diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index 8c8f31e..8089a82 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c

@@ -19,6 +19,7 @@
 #include <linux/cpufreq.h>
 #include <linux/regulator/consumer.h>
 #include <linux/platform_data/gpio-davinci.h>
+#include <linux/platform_data/usb-davinci.h>
 
 #include <asm/mach/map.h>
 

@@ -360,6 +361,12 @@ static struct clk aemif_clk = {
 	.flags		= ALWAYS_ENABLED,
 };
 
+static struct clk usb_ref_clk = {
+	.name		= "usb_ref_clk",
+	.rate		= 48000000,
+	.set_rate	= davinci_simple_set_rate,
+};
+
 static struct clk usb11_clk = {
 	.name		= "usb11",
 	.parent		= &pll0_sysclk4,

@@ -374,6 +381,139 @@ static struct clk usb20_clk = {
 	.gpsc		= 1,
 };
 
+static void usb20_phy_clk_enable(struct clk *clk)
+{
+	u32 val;
+
+	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	/*
+	 * Turn on the USB 2.0 PHY, but just the PLL, and not OTG. The USB 1.1
+	 * host may use the PLL clock without USB 2.0 OTG being used.
+	 */
+	val &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN);
+	val |= CFGCHIP2_PHY_PLLON;
+
+	writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	pr_info("Waiting for USB 2.0 PHY clock good...\n");
+	while (!(readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG))
+						& CFGCHIP2_PHYCLKGD))
+		cpu_relax();
+}