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authorPaul Walmsley <paul@pwsan.com>2010-12-21 21:05:16 -0700
committerPaul Walmsley <paul@pwsan.com>2010-12-21 21:05:16 -0700
commit596efe4792c50163578578bd4fe470f97652aad7 (patch)
tree266074fe2cf349b8402db948a69b2822d5763b0e /arch/arm/mach-omap2/control.c
parent72e06d087204f3bc9acf281717b90ebf0b9731f7 (diff)
OMAP3: control/PM: move padconf save code to mach-omap2/control.c
Move the padconf save code from pm34xx.c to the System Control Module code in mach-omap2/control.c. This is part of the general push to move direct register access from middle-layer core code to low-level core code, so the middle-layer code can be abstracted to work on multiple platforms and cleaned up. In the medium-to-long term, this code should be called by the mux layer code, not the PM idle code. This is because, according to the TRM, saving the padconf only needs to be done when the padconf changes[1]. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Kevin Hilman <khilman@deeprootsystems.com> Cc: Tony Lindgren <tony@atomide.com> Tested-by: Rajendra Nayak <rnayak@ti.com> Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com> 1. OMAP34xx Multimedia Device Silicon Revision 3.1.x [Rev. ZH] [SWPU222H] Section 4.11.4 "Device Off-Mode Sequences"
Diffstat (limited to 'arch/arm/mach-omap2/control.c')
-rw-r--r--arch/arm/mach-omap2/control.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/control.c b/arch/arm/mach-omap2/control.c
index 61101e807df..69527941902 100644
--- a/arch/arm/mach-omap2/control.c
+++ b/arch/arm/mach-omap2/control.c
@@ -26,6 +26,10 @@
#include "pm.h"
#include "control.h"
+/* Used by omap3_ctrl_save_padconf() */
+#define START_PADCONF_SAVE 0x2
+#define PADCONF_SAVE_DONE 0x1
+
static void __iomem *omap2_ctrl_base;
static void __iomem *omap4_ctrl_pad_base;
@@ -530,4 +534,31 @@ void omap3630_ctrl_disable_rta(void)
omap_ctrl_writel(OMAP36XX_RTA_DISABLE, OMAP36XX_CONTROL_MEM_RTA_CTRL);
}
+/**
+ * omap3_ctrl_save_padconf - save padconf registers to scratchpad RAM
+ *
+ * Tell the SCM to start saving the padconf registers, then wait for
+ * the process to complete. Returns 0 unconditionally, although it
+ * should also eventually be able to return -ETIMEDOUT, if the save
+ * does not complete.
+ *
+ * XXX This function is missing a timeout. What should it be?
+ */
+int omap3_ctrl_save_padconf(void)
+{
+ u32 cpo;
+
+ /* Save the padconf registers */
+ cpo = omap_ctrl_readl(OMAP343X_CONTROL_PADCONF_OFF);
+ cpo |= START_PADCONF_SAVE;
+ omap_ctrl_writel(cpo, OMAP343X_CONTROL_PADCONF_OFF);
+
+ /* wait for the save to complete */
+ while (!(omap_ctrl_readl(OMAP343X_CONTROL_GENERAL_PURPOSE_STATUS)
+ & PADCONF_SAVE_DONE))
+ udelay(1);
+
+ return 0;
+}
+
#endif /* CONFIG_ARCH_OMAP3 && CONFIG_PM */