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ARM: OMAP4+/AM33xx: CM: add common API for cm_wait_module_idle

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Adds a generic CM driver API for waiting module to enter idle / standby.
The SoC specific implementations are registered through cm_ll_data.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tero Kristo 2014-10-27 08:39:23 -07:00 committed by Tony Lindgren
parent 021b6ff05c
commit a8ae5afa5c
7 changed files with 45 additions and 13 deletions
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5
arch/arm/mach-omap2/cm.h
View file

@ -45,18 +45,23 @@ extern void omap2_set_globals_cm(void __iomem *cm, void __iomem *cm2);
* struct cm_ll_data - fn ptrs to per-SoC CM function implementations
* @split_idlest_reg: ptr to the SoC CM-specific split_idlest_reg impl
* @wait_module_ready: ptr to the SoC CM-specific wait_module_ready impl
* @wait_module_idle: ptr to the SoC CM-specific wait_module_idle impl
*/
struct cm_ll_data {
int (*split_idlest_reg)(void __iomem *idlest_reg, s16 *prcm_inst,
u8 *idlest_reg_id);
int (*wait_module_ready)(u8 part, s16 prcm_mod, u16 idlest_reg,
u8 idlest_shift);
int (*wait_module_idle)(u8 part, s16 prcm_mod, u16 idlest_reg,
u8 idlest_shift);
};
extern int cm_split_idlest_reg(void __iomem *idlest_reg, s16 *prcm_inst,
u8 *idlest_reg_id);
int omap_cm_wait_module_ready(u8 part, s16 prcm_mod, u16 idlest_reg,
u8 idlest_shift);
int omap_cm_wait_module_idle(u8 part, s16 prcm_mod, u16 idlest_reg,
u8 idlest_shift);
extern int cm_register(struct cm_ll_data *cld);
extern int cm_unregister(struct cm_ll_data *cld);

6
arch/arm/mach-omap2/cm33xx.c
View file

@ -250,14 +250,17 @@ static int am33xx_cm_wait_module_ready(u8 part, s16 inst, u16 clkctrl_offs,
/**
* am33xx_cm_wait_module_idle - wait for a module to be in 'disabled'
* state
* @part: CM partition, ignored for AM33xx
* @inst: CM instance register offset (*_INST macro)
* @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
* @bit_shift: bit shift for the register, ignored for AM33xx
*
* Wait for the module IDLEST to be disabled. Some PRCM transition,
* like reset assertion or parent clock de-activation must wait the
* module to be fully disabled.
*/
int am33xx_cm_wait_module_idle(u16 inst, u16 clkctrl_offs)
static int am33xx_cm_wait_module_idle(u8 part, s16 inst, u16 clkctrl_offs,
u8 bit_shift)
{
int i = 0;
@ -364,6 +367,7 @@ struct clkdm_ops am33xx_clkdm_operations = {
static struct cm_ll_data am33xx_cm_ll_data = {
.wait_module_ready = &am33xx_cm_wait_module_ready,
.wait_module_idle = &am33xx_cm_wait_module_idle,
};
int __init am33xx_cm_init(void)

5
arch/arm/mach-omap2/cm33xx.h
View file

@ -382,16 +382,11 @@ void am33xx_cm_clkdm_force_wakeup(u16 inst, u16 cdoffs);
int am33xx_cm_init(void);
#if defined(CONFIG_SOC_AM33XX) || defined(CONFIG_SOC_AM43XX)
int am33xx_cm_wait_module_idle(u16 inst, u16 clkctrl_offs);
extern void am33xx_cm_module_enable(u8 mode, u16 inst, s16 cdoffs,
u16 clkctrl_offs);
extern void am33xx_cm_module_disable(u16 inst, s16 cdoffs,
u16 clkctrl_offs);
#else
static inline int am33xx_cm_wait_module_idle(u16 inst, u16 clkctrl_offs)
{
return 0;
}
static inline void am33xx_cm_module_enable(u8 mode, u16 inst, s16 cdoffs,
u16 clkctrl_offs)
{

26
arch/arm/mach-omap2/cm_common.c
View file

@ -97,6 +97,32 @@ int omap_cm_wait_module_ready(u8 part, s16 prcm_mod, u16 idlest_reg,
idlest_shift);
}
/**
* omap_cm_wait_module_idle - wait for a module to enter idle or standby
* @part: PRCM partition
* @prcm_mod: PRCM module offset
* @idlest_reg: CM_IDLESTx register
* @idlest_shift: shift of the bit in the CM_IDLEST* register to check
*
* Wait for the PRCM to indicate that the module identified by
* (@prcm_mod, @idlest_id, @idlest_shift) is no longer clocked. Return
* 0 upon success, -EBUSY if the module doesn't enable in time, or
* -EINVAL if no per-SoC wait_module_idle() function pointer has been
* registered or if the idlest register is unknown on the SoC.
*/
int omap_cm_wait_module_idle(u8 part, s16 prcm_mod, u16 idlest_reg,
u8 idlest_shift)
{
if (!cm_ll_data->wait_module_idle) {
WARN_ONCE(1, "cm: %s: no low-level function defined\n",
__func__);
return -EINVAL;
}
return cm_ll_data->wait_module_idle(part, prcm_mod, idlest_reg,
idlest_shift);
}
/**
* cm_register - register per-SoC low-level data with the CM
* @cld: low-level per-SoC OMAP CM data & function pointers to register

5
arch/arm/mach-omap2/cminst44xx.c
View file

@ -293,12 +293,14 @@ static int omap4_cminst_wait_module_ready(u8 part, s16 inst, u16 clkctrl_offs,
* @part: PRCM partition ID that the CM_CLKCTRL register exists in
* @inst: CM instance register offset (*_INST macro)
* @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
* @bit_shift: Bit shift for the register, ignored for OMAP4+
*
* Wait for the module IDLEST to be disabled. Some PRCM transition,
* like reset assertion or parent clock de-activation must wait the
* module to be fully disabled.
*/
int omap4_cminst_wait_module_idle(u8 part, u16 inst, u16 clkctrl_offs)
static int omap4_cminst_wait_module_idle(u8 part, s16 inst, u16 clkctrl_offs,
u8 bit_shift)
{
int i = 0;
@ -510,6 +512,7 @@ struct clkdm_ops am43xx_clkdm_operations = {
static struct cm_ll_data omap4xxx_cm_ll_data = {
.wait_module_ready = &omap4_cminst_wait_module_ready,
.wait_module_idle = &omap4_cminst_wait_module_idle,
};
int __init omap4_cm_init(void)

1
arch/arm/mach-omap2/cminst44xx.h
View file

@ -16,7 +16,6 @@ void omap4_cminst_clkdm_enable_hwsup(u8 part, u16 inst, u16 cdoffs);
void omap4_cminst_clkdm_disable_hwsup(u8 part, u16 inst, u16 cdoffs);
void omap4_cminst_clkdm_force_sleep(u8 part, u16 inst, u16 cdoffs);
void omap4_cminst_clkdm_force_wakeup(u8 part, u16 inst, u16 cdoffs);
int omap4_cminst_wait_module_idle(u8 part, u16 inst, u16 clkctrl_offs);
extern void omap4_cminst_module_enable(u8 mode, u8 part, u16 inst, s16 cdoffs,
u16 clkctrl_offs);
extern void omap4_cminst_module_disable(u8 part, u16 inst, s16 cdoffs,

10
arch/arm/mach-omap2/omap_hwmod.c
View file

@ -1026,9 +1026,9 @@ static int _omap4_wait_target_disable(struct omap_hwmod *oh)
if (oh->flags & HWMOD_NO_IDLEST)
return 0;
return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
oh->clkdm->cm_inst,
oh->prcm.omap4.clkctrl_offs);
return omap_cm_wait_module_idle(oh->clkdm->prcm_partition,
oh->clkdm->cm_inst,
oh->prcm.omap4.clkctrl_offs, 0);
}
/**
@ -1051,8 +1051,8 @@ static int _am33xx_wait_target_disable(struct omap_hwmod *oh)
if (oh->flags & HWMOD_NO_IDLEST)
return 0;
return am33xx_cm_wait_module_idle(oh->clkdm->cm_inst,
oh->prcm.omap4.clkctrl_offs);
return omap_cm_wait_module_idle(0, oh->clkdm->cm_inst,
oh->prcm.omap4.clkctrl_offs, 0);
}
/**