[PATCH] ARM: OMAP2+: am33xx: Add PRM warm reset/reboot support
From: Vaibhav Hiremath <hidden>
Date: 2012-10-29 09:59:07
Also in:
linux-omap
Subsystem:
arm port, omap powerdomain soc adaptation layer support, omap2+ support, the rest · Maintainers:
Russell King, Paul Walmsley, Aaro Koskinen, Andreas Kemnade, Kevin Hilman, Roger Quadros, Tony Lindgren, Linus Torvalds
This patch adds reboot capability to all AM33XX based boards/EVM's, by asserting PRM warm reset bit on 'reboot' command. Signed-off-by: Vaibhav Hiremath <redacted> Tested-by: Daniel Mack <zonque@gmail.com> Cc: Paul Walmsley <paul@pwsan.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Afzal Mohammed <redacted> --- Tested on AM335xEVM and BeagleBone platform. arch/arm/mach-omap2/board-generic.c | 1 + arch/arm/mach-omap2/prcm.c | 3 +++ arch/arm/mach-omap2/prm33xx.c | 15 +++++++++++++++ arch/arm/mach-omap2/prm33xx.h | 1 + 4 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
index 601ecdf..6a69ceb 100644
--- a/arch/arm/mach-omap2/board-generic.c
+++ b/arch/arm/mach-omap2/board-generic.c@@ -114,6 +114,7 @@ DT_MACHINE_START(AM33XX_DT, "Generic AM33XX (Flattened Device Tree)") .init_machine = omap_generic_init, .timer = &omap3_am33xx_timer, .dt_compat = am33xx_boards_compat, + .restart = omap_prcm_restart, MACHINE_END #endif
diff --git a/arch/arm/mach-omap2/prcm.c b/arch/arm/mach-omap2/prcm.c
index cff270a..07f163c 100644
--- a/arch/arm/mach-omap2/prcm.c
+++ b/arch/arm/mach-omap2/prcm.c@@ -34,6 +34,7 @@ #include "cm2xxx_3xxx.h" #include "prm2xxx_3xxx.h" #include "prm44xx.h" +#include "prm33xx.h" #include "prminst44xx.h" #include "cminst44xx.h" #include "prm-regbits-24xx.h"
@@ -73,6 +74,8 @@ void omap_prcm_restart(char mode, const char *cmd) omap3_ctrl_write_boot_mode((cmd ? (u8)*cmd : 0)); } else if (cpu_is_omap44xx()) { omap4_prminst_global_warm_sw_reset(); /* never returns */ + } else if (soc_is_am33xx()) { + am33xx_prm_global_warm_sw_reset(); /* never returns */ } else { WARN_ON(1); }
diff --git a/arch/arm/mach-omap2/prm33xx.c b/arch/arm/mach-omap2/prm33xx.c
index 53ec9cb..657c3d0 100644
--- a/arch/arm/mach-omap2/prm33xx.c
+++ b/arch/arm/mach-omap2/prm33xx.c@@ -135,6 +135,21 @@ int am33xx_prm_deassert_hardreset(u8 shift, s16 inst, return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0; } +void am33xx_prm_global_warm_sw_reset(void) +{ + u32 v; + + v = am33xx_prm_read_reg(AM33XX_PRM_DEVICE_MOD, + AM33XX_PRM_RSTCTRL_OFFSET); + v |= AM33XX_GLOBAL_WARM_SW_RST_MASK; + am33xx_prm_write_reg(v, AM33XX_PRM_DEVICE_MOD, + AM33XX_PRM_RSTCTRL_OFFSET); + + /* OCP barrier */ + v = am33xx_prm_read_reg(AM33XX_PRM_DEVICE_MOD, + AM33XX_PRM_RSTCTRL_OFFSET); +} + static int am33xx_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) { am33xx_prm_rmw_reg_bits(OMAP_POWERSTATE_MASK,
diff --git a/arch/arm/mach-omap2/prm33xx.h b/arch/arm/mach-omap2/prm33xx.h
index 3f25c56..cdfc694 100644
--- a/arch/arm/mach-omap2/prm33xx.h
+++ b/arch/arm/mach-omap2/prm33xx.h@@ -126,4 +126,5 @@ extern int am33xx_prm_is_hardreset_asserted(u8 shift, s16 inst, extern int am33xx_prm_assert_hardreset(u8 shift, s16 inst, u16 rstctrl_offs); extern int am33xx_prm_deassert_hardreset(u8 shift, s16 inst, u16 rstctrl_offs, u16 rstst_offs); +extern void am33xx_prm_global_warm_sw_reset(void); #endif --
1.7.0.4