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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>
This commit is contained in:
Paul Walmsley 2010-12-21 21:05:14 -07:00
parent 2ace831ffc
commit dac9a77120
3 changed files with 24 additions and 9 deletions
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17
arch/arm/mach-omap2/prcm.c
View File

@ -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 */
}
/**

14
arch/arm/mach-omap2/prm44xx.c
View File

@ -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);
}

2
arch/arm/mach-omap2/prm44xx.h
View File

@ -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