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ARM: AM33xx: PRM: Implement REBOOT_COLD

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Historically AM33xx performed warm software reset even though requested
(and default) was REBOOT_COLD. Reflect the de-facto default mode in
/sys/kernel/reboot/mode correctly and implement the real REBOOT_COLD
(if configured explicitly).

Tested-by: Matthias Michel <matthias.michel@siemens.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Message-ID: <20240221154614.3549951-2-alexander.sverdlin@siemens.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Alexander Sverdlin 2024-02-21 16:45:51 +01:00 committed by Tony Lindgren
parent 1afa7542be
commit 6521f6a195
6 changed files with 30 additions and 5 deletions
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3
arch/arm/mach-omap2/am33xx-restart.c
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@ -18,7 +18,8 @@
*/
void am33xx_restart(enum reboot_mode mode, const char *cmd)
{
/* TODO: Handle mode and cmd if necessary */
/* TODO: Handle cmd if necessary */
prm_reboot_mode = mode;
omap_prm_reset_system();
}

6
arch/arm/mach-omap2/board-generic.c
View File

@ -246,6 +246,12 @@ DT_MACHINE_START(AM33XX_DT, "Generic AM33XX (Flattened Device Tree)")
.init_time = omap_init_time_of,
.dt_compat = am33xx_boards_compat,
.restart = am33xx_restart,
/*
* Historically am33xx supported only REBOOT_WARM even though default
* reboot_mode was REBOOT_COLD. Reflect legacy de-facto behaviour in
* SYSFS.
*/
.reboot_mode = REBOOT_WARM,
MACHINE_END
#endif

1
arch/arm/mach-omap2/prm-regbits-33xx.h
View File

@ -15,6 +15,7 @@
#define AM33XX_GFX_MEM_STATEST_MASK (0x3 << 4)
#define AM33XX_GLOBAL_WARM_SW_RST_MASK (1 << 1)
#define AM33XX_RST_GLOBAL_WARM_SW_MASK (1 << 0)
#define AM33XX_RST_GLOBAL_COLD_SW_MASK (1 << 1)
#define AM33XX_PRUSS_MEM_ONSTATE_MASK (0x3 << 5)
#define AM33XX_PRUSS_MEM_RETSTATE_MASK (1 << 7)
#define AM33XX_PRUSS_MEM_STATEST_MASK (0x3 << 23)

1
arch/arm/mach-omap2/prm.h
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@ -15,6 +15,7 @@
# ifndef __ASSEMBLER__
extern struct omap_domain_base prm_base;
extern u16 prm_features;
extern enum reboot_mode prm_reboot_mode;
int omap_prcm_init(void);
int omap2_prcm_base_init(void);
# endif

18
arch/arm/mach-omap2/prm33xx.c
View File

@ -10,6 +10,7 @@
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/reboot.h>
#include "powerdomain.h"
#include "prm33xx.h"
@ -318,10 +319,19 @@ static int am33xx_check_vcvp(void)
*
* Immediately reboots the device through warm reset.
*/
static void am33xx_prm_global_warm_sw_reset(void)
static void am33xx_prm_global_sw_reset(void)
{
am33xx_prm_rmw_reg_bits(AM33XX_RST_GLOBAL_WARM_SW_MASK,
AM33XX_RST_GLOBAL_WARM_SW_MASK,
/*
* Historically AM33xx performed warm reset for all requested reboot_mode.
* Keep this behaviour unchanged for all except newly added REBOOT_COLD.
*/
u32 mask = AM33XX_RST_GLOBAL_WARM_SW_MASK;
if (prm_reboot_mode == REBOOT_COLD)
mask = AM33XX_RST_GLOBAL_COLD_SW_MASK;
am33xx_prm_rmw_reg_bits(mask,
mask,
AM33XX_PRM_DEVICE_MOD,
AM33XX_PRM_RSTCTRL_OFFSET);
@ -382,7 +392,7 @@ static struct prm_ll_data am33xx_prm_ll_data = {
.assert_hardreset = am33xx_prm_assert_hardreset,
.deassert_hardreset = am33xx_prm_deassert_hardreset,
.is_hardreset_asserted = am33xx_prm_is_hardreset_asserted,
.reset_system = am33xx_prm_global_warm_sw_reset,
.reset_system = am33xx_prm_global_sw_reset,
};
int __init am33xx_prm_init(const struct omap_prcm_init_data *data)

6
arch/arm/mach-omap2/prm_common.c
View File

@ -66,6 +66,12 @@ struct omap_domain_base prm_base;
u16 prm_features;
/*
* Platforms that implement different reboot modes can store the requested
* mode here.
*/
enum reboot_mode prm_reboot_mode;
/*
* prm_ll_data: function pointers to SoC-specific implementations of
* common PRM functions