1 files changed, 65 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index 697b58f8e4a8..c016ae4cbad1 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -15,6 +15,7 @@
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/err.h>
+#include <linux/io.h>
 
 #include <plat/common.h>
 #include <plat/cpu.h>
@@ -29,6 +30,70 @@
  */
 #define OMAP4_RST_CTRL_ST_OFFSET		4
 
+/* PRM low-level functions */
+
+/* Read a register in a CM/PRM instance in the PRM module */
+u32 omap4_prm_read_inst_reg(s16 inst, u16 reg)
+{
+	return __raw_readl(OMAP44XX_PRM_REGADDR(inst, reg));
+}
+
+/* Write into a register in a CM/PRM instance in the PRM module */
+void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg)
+{
+	__raw_writel(val, OMAP44XX_PRM_REGADDR(inst, reg));
+}
+
+/* Read-modify-write a register in a PRM module. Caller must lock */
+u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg)
+{
+	u32 v;
+
+	v = omap4_prm_read_inst_reg(inst, reg);
+	v &= ~mask;
+	v |= bits;
+	omap4_prm_write_inst_reg(v, inst, reg);
+
+	return v;
+}
+
+/* Read a PRM register, AND it, and shift the result down to bit 0 */
+/* XXX deprecated */
+u32 omap4_prm_read_bits_shift(void __iomem *reg, u32 mask)
+{
+	u32 v;
+
+	v = __raw_readl(reg);
+	v &= mask;
+	v >>= __ffs(mask);
+
+	return v;
+}
+
+/* Read-modify-write a register in a PRM module. Caller must lock */
+/* XXX deprecated */
+u32 omap4_prm_rmw_reg_bits(u32 mask, u32 bits, void __iomem *reg)
+{
+	u32 v;
+
+	v = __raw_readl(reg);
+	v &= ~mask;
+	v |= bits;
+	__raw_writel(v, reg);
+
+	return v;
+}
+
+u32 omap4_prm_set_inst_reg_bits(u32 bits, s16 inst, s16 reg)
+{
+	return omap4_prm_rmw_inst_reg_bits(bits, bits, inst, reg);
+}
+
+u32 omap4_prm_clear_inst_reg_bits(u32 bits, s16 inst, s16 reg)
+{
+	return omap4_prm_rmw_inst_reg_bits(bits, 0x0, inst, reg);
+}
+
 /**
  * omap4_prm_is_hardreset_asserted - read the HW reset line state of
  * submodules contained in the hwmod module