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authorTero Kristo <t-kristo@ti.com>2012-11-09 16:30:35 +0200
committerKevin Hilman <khilman@ti.com>2012-11-13 15:57:09 -0800
commit4fd7a41233eac62b10ede394b35d8919086f94ec (patch)
tree39b16f2baa69cad668df2c6511f2ec1515df1f3f /arch/arm/mach-omap2/omap_phy_internal.c
parent0c7018e232c5526869250e57da8043a86a45b5de (diff)
ARM: OMAP4: USB: power down MUSB PHY during boot
Commit c9e4412ab8eb8ef82d645d8749c4ce96ad490007 removed all of the USB PHY functions for OMAP4, but this causes a problem with core retention as the MUSB module remains enabled if omap-usb2 phy driver is not used. This keeps the USB DPLL enabled and prevents l3_init pwrdm from idling. Fixed by adding a minimal function back that disables the USB PHY during boot. Signed-off-by: Tero Kristo <t-kristo@ti.com> Cc: Kishon Vijay Abraham I <kishon@ti.com> Cc: Tony Lindgren <tony@atomide.com> Acked-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/omap_phy_internal.c')
-rw-r--r--arch/arm/mach-omap2/omap_phy_internal.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap_phy_internal.c b/arch/arm/mach-omap2/omap_phy_internal.c
index d992db8ff0b..9b56e5e1a2d 100644
--- a/arch/arm/mach-omap2/omap_phy_internal.c
+++ b/arch/arm/mach-omap2/omap_phy_internal.c
@@ -33,6 +33,38 @@
#include "soc.h"
#include "control.h"
+#define CONTROL_DEV_CONF 0x300
+#define PHY_PD 0x1
+
+/**
+ * omap4430_phy_power_down: disable MUSB PHY during early init
+ *
+ * OMAP4 MUSB PHY module is enabled by default on reset, but this will
+ * prevent core retention if not disabled by SW. USB driver will
+ * later on enable this, once and if the driver needs it.
+ */
+static int __init omap4430_phy_power_down(void)
+{
+ void __iomem *ctrl_base;
+
+ if (!cpu_is_omap44xx())
+ return 0;
+
+ ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
+ if (!ctrl_base) {
+ pr_err("control module ioremap failed\n");
+ return -ENOMEM;
+ }
+
+ /* Power down the phy */
+ __raw_writel(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
+
+ iounmap(ctrl_base);
+
+ return 0;
+}
+early_initcall(omap4430_phy_power_down);
+
void am35x_musb_reset(void)
{
u32 regval;