ARM: OMAP3: PRM: add API for checking and clearing cold reset status

This isolates the PRM register access within the PRM driver.

Signed-off-by: Tero Kristo <t-kristo@ti.com>

diff --git a/arch/arm/mach-omap2/control.c b/arch/arm/mach-omap2/control.c
index 751f3549bf6fcb7c2a3c4d1a53f6ca628dc3956c..f8eb3e4354ad23b78920633e0c992d95184046f4 100644 (file)
--- a/arch/arm/mach-omap2/control.c
+++ b/arch/arm/mach-omap2/control.c
@@ -282,13 +282,9 @@ void omap3_clear_scratchpad_contents(void)
        void __iomem *v_addr;
        u32 offset = 0;
        v_addr = OMAP2_L4_IO_ADDRESS(OMAP343X_SCRATCHPAD_ROM);
-       if (omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP3_PRM_RSTST_OFFSET) &
-           OMAP3430_GLOBAL_COLD_RST_MASK) {
+       if (omap3xxx_prm_clear_global_cold_reset()) {
                for ( ; offset <= max_offset; offset += 0x4)
                        writel_relaxed(0x0, (v_addr + offset));
-               omap2_prm_set_mod_reg_bits(OMAP3430_GLOBAL_COLD_RST_MASK,
-                                          OMAP3430_GR_MOD,
-                                          OMAP3_PRM_RSTST_OFFSET);
        }
 }
 

diff --git a/arch/arm/mach-omap2/prm3xxx.c b/arch/arm/mach-omap2/prm3xxx.c
index e46ff7184c9d4139df331ac0b03cd3c27a94a081..4733c28d9d64232d6538c9ffb2f3669a778cfec9 100644 (file)
--- a/arch/arm/mach-omap2/prm3xxx.c
+++ b/arch/arm/mach-omap2/prm3xxx.c
@@ -389,6 +389,26 @@ void omap3xxx_prm_iva_idle(void)
                                OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
 }
 
+/**
+ * omap3xxx_prm_clear_global_cold_reset - checks the global cold reset status
+ *                                       and clears it if asserted
+ *
+ * Checks if cold-reset has occurred and clears the status bit if yes. Returns
+ * 1 if cold-reset has occurred, 0 otherwise.
+ */
+int omap3xxx_prm_clear_global_cold_reset(void)
+{
+       if (omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP3_PRM_RSTST_OFFSET) &
+           OMAP3430_GLOBAL_COLD_RST_MASK) {
+               omap2_prm_set_mod_reg_bits(OMAP3430_GLOBAL_COLD_RST_MASK,
+                                          OMAP3430_GR_MOD,
+                                          OMAP3_PRM_RSTST_OFFSET);
+               return 1;
+       }
+
+       return 0;
+}
+
 /* Powerdomain low-level functions */
 
 static int omap3_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)

diff --git a/arch/arm/mach-omap2/prm3xxx.h b/arch/arm/mach-omap2/prm3xxx.h
index 21eb1d5ba52450a7b2e87003b609b47ab41764f0..7548ae0e86d53f5084077d17332bafe081d4f176 100644 (file)
--- a/arch/arm/mach-omap2/prm3xxx.h
+++ b/arch/arm/mach-omap2/prm3xxx.h
@@ -165,6 +165,7 @@ extern u32 omap3xxx_prm_get_reset_sources(void);
 int omap3xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits);
 void omap3xxx_prm_iva_idle(void);
 void omap3_prm_reset_modem(void);
+int omap3xxx_prm_clear_global_cold_reset(void);
 
 #endif /* __ASSEMBLER */