OMAP4: PRCM: move global reset function for OMAP4 to an OMAP4-specific file

Move the OMAP4 global software reset function to the OMAP4-specific
prm44xx.c file, where it belongs.  Part of the long-term process of
moving all of the direct PRCM register writes into lower-layer code.

Also add OCP barriers on OMAP2/3/4 to reduce the chance that the MPU
will continue executing while the system is supposed to be resetting
itself.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Rajendra Nayak <rnayak@ti.com>

diff --git a/arch/arm/mach-omap2/prcm.c b/arch/arm/mach-omap2/prcm.c
index fe0865b..68c541f 100644 (file)
--- a/arch/arm/mach-omap2/prcm.c
+++ b/arch/arm/mach-omap2/prcm.c
@@ -68,17 +68,16 @@ void omap_prcm_arch_reset(char mode, const char *cmd)
        } else if (cpu_is_omap34xx()) {
                prcm_offs = OMAP3430_GR_MOD;
                omap3_ctrl_write_boot_mode((cmd ? (u8)*cmd : 0));
-       } else if (cpu_is_omap44xx())
-               prcm_offs = OMAP4430_PRM_DEVICE_INST;
-       else
+       } else if (cpu_is_omap44xx()) {
+               omap4_prm_global_warm_sw_reset(); /* never returns */
+       } else {
                WARN_ON(1);
+       }
 
-       if (cpu_is_omap24xx() || cpu_is_omap34xx())
-               prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, prcm_offs,
-                                                OMAP2_RM_RSTCTRL);
-       if (cpu_is_omap44xx())
-               prm_set_mod_reg_bits(OMAP4430_RST_GLOBAL_WARM_SW_MASK,
-                                    prcm_offs, OMAP4_RM_RSTCTRL);
+       /* XXX should be moved to some OMAP2/3 specific code */
+       prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, prcm_offs,
+                            OMAP2_RM_RSTCTRL);
+       prm_read_mod_reg(prcm_offs, OMAP2_RM_RSTCTRL); /* OCP barrier */
 }
 
 /**

diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index c016ae4..a2a04bf 100644 (file)
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -179,3 +179,17 @@ int omap4_prm_deassert_hardreset(void __iomem *rstctrl_reg, u8 shift)
        return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
 }
 
+void omap4_prm_global_warm_sw_reset(void)
+{
+       u32 v;
+
+       v = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
+                                   OMAP4_RM_RSTCTRL);
+       v |= OMAP4430_RST_GLOBAL_WARM_SW_MASK;
+       omap4_prm_write_inst_reg(v, OMAP4430_PRM_DEVICE_INST,
+                                OMAP4_RM_RSTCTRL);
+
+       /* OCP barrier */
+       v = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
+                                   OMAP4_RM_RSTCTRL);
+}

diff --git a/arch/arm/mach-omap2/prm44xx.h b/arch/arm/mach-omap2/prm44xx.h
index 3588653..95542ae 100644 (file)
--- a/arch/arm/mach-omap2/prm44xx.h
+++ b/arch/arm/mach-omap2/prm44xx.h
@@ -756,6 +756,8 @@ extern int omap4_prm_is_hardreset_asserted(void __iomem *rstctrl_reg, u8 shift);
 extern int omap4_prm_assert_hardreset(void __iomem *rstctrl_reg, u8 shift);
 extern int omap4_prm_deassert_hardreset(void __iomem *rstctrl_reg, u8 shift);
 
+extern void omap4_prm_global_warm_sw_reset(void);
+
 # endif
 
 #endif