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Reimplement the OMAP PRCM I/O chain code. Needed for I/O wakeups to

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work correctly.
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Merge tag 'omap-devel-c-for-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/pjw/omap-pending into devel-pm

Reimplement the OMAP PRCM I/O chain code.  Needed for I/O wakeups to
work correctly.

Conflicts:
	arch/arm/mach-omap2/prm2xxx_3xxx.c
This commit is contained in:
Tony Lindgren 2012-06-25 07:41:17 -07:00
parent 6b16351acb fafcdd5322
commit 9a17d88e05
7 changed files with 162 additions and 56 deletions
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38
arch/arm/mach-omap2/omap_hwmod.c
View file

@ -153,6 +153,7 @@
#include "prm44xx.h"
#include "prminst44xx.h"
#include "mux.h"
#include "pm.h"
/* Maximum microseconds to wait for OMAP module to softreset */
#define MAX_MODULE_SOFTRESET_WAIT 10000
@ -172,6 +173,9 @@ static LIST_HEAD(omap_hwmod_list);
/* mpu_oh: used to add/remove MPU initiator from sleepdep list */
static struct omap_hwmod *mpu_oh;
/* io_chain_lock: used to serialize reconfigurations of the I/O chain */
static DEFINE_SPINLOCK(io_chain_lock);
/*
* linkspace: ptr to a buffer that struct omap_hwmod_link records are
* allocated from - used to reduce the number of small memory
@ -1737,6 +1741,32 @@ static int _reset(struct omap_hwmod *oh)
return r;
}
/**
* _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
*
* Call the appropriate PRM function to clear any logged I/O chain
* wakeups and to reconfigure the chain. This apparently needs to be
* done upon every mux change. Since hwmods can be concurrently
* enabled and idled, hold a spinlock around the I/O chain
* reconfiguration sequence. No return value.
*
* XXX When the PRM code is moved to drivers, this function can be removed,
* as the PRM infrastructure should abstract this.
*/
static void _reconfigure_io_chain(void)
{
unsigned long flags;
spin_lock_irqsave(&io_chain_lock, flags);
if (cpu_is_omap34xx() && omap3_has_io_chain_ctrl())
omap3xxx_prm_reconfigure_io_chain();
else if (cpu_is_omap44xx())
omap44xx_prm_reconfigure_io_chain();
spin_unlock_irqrestore(&io_chain_lock, flags);
}
/**
* _enable - enable an omap_hwmod
* @oh: struct omap_hwmod *
@ -1793,8 +1823,10 @@ static int _enable(struct omap_hwmod *oh)
/* Mux pins for device runtime if populated */
if (oh->mux && (!oh->mux->enabled ||
((oh->_state == _HWMOD_STATE_IDLE) &&
oh->mux->pads_dynamic)))
oh->mux->pads_dynamic))) {
omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
_reconfigure_io_chain();
}
_add_initiator_dep(oh, mpu_oh);
@ -1883,8 +1915,10 @@ static int _idle(struct omap_hwmod *oh)
clkdm_hwmod_disable(oh->clkdm, oh);
/* Mux pins for device idle if populated */
if (oh->mux && oh->mux->pads_dynamic)
if (oh->mux && oh->mux->pads_dynamic) {
omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
_reconfigure_io_chain();
}
oh->_state = _HWMOD_STATE_IDLE;

44
arch/arm/mach-omap2/pm34xx.c
View file

@ -72,33 +72,6 @@ static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
static struct powerdomain *core_pwrdm, *per_pwrdm;
static struct powerdomain *cam_pwrdm;
static void omap3_enable_io_chain(void)
{
int timeout = 0;
omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
PM_WKEN);
/* Do a readback to assure write has been done */
omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN);
while (!(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN) &
OMAP3430_ST_IO_CHAIN_MASK)) {
timeout++;
if (timeout > 1000) {
pr_err("Wake up daisy chain activation failed.\n");
return;
}
omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK,
WKUP_MOD, PM_WKEN);
}
}
static void omap3_disable_io_chain(void)
{
omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
PM_WKEN);
}
static void omap3_core_save_context(void)
{
omap3_ctrl_save_padconf();
@ -299,13 +272,6 @@ void omap_sram_idle(void)
/* Enable IO-PAD and IO-CHAIN wakeups */
per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
if (omap3_has_io_wakeup() &&
(per_next_state < PWRDM_POWER_ON ||
core_next_state < PWRDM_POWER_ON)) {
omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, PM_WKEN);
if (omap3_has_io_chain_ctrl())
omap3_enable_io_chain();
}
pwrdm_pre_transition();
@ -378,16 +344,6 @@ void omap_sram_idle(void)
if (per_next_state < PWRDM_POWER_ON)
omap2_gpio_resume_after_idle();
/* Disable IO-PAD and IO-CHAIN wakeup */
if (omap3_has_io_wakeup() &&
(per_next_state < PWRDM_POWER_ON ||
core_next_state < PWRDM_POWER_ON)) {
omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
PM_WKEN);
if (omap3_has_io_chain_ctrl())
omap3_disable_io_chain();
}
clkdm_allow_idle(mpu_pwrdm->pwrdm_clkdms[0]);
}

8
arch/arm/mach-omap2/prcm-common.h
View file

@ -410,6 +410,14 @@
*/
#define MAX_MODULE_HARDRESET_WAIT 10000
/*
* Maximum time(us) it takes to output the signal WUCLKOUT of the last
* pad of the I/O ring after asserting WUCLKIN high. Tero measured
* the actual time at 7 to 8 microseconds on OMAP3 and 2 to 4
* microseconds on OMAP4, so this timeout may be too high.
*/
#define MAX_IOPAD_LATCH_TIME 100
# ifndef __ASSEMBLER__
extern void __iomem *prm_base;
extern void __iomem *cm_base;

57
arch/arm/mach-omap2/prm2xxx_3xxx.c
View file

@ -302,17 +302,60 @@ void omap3xxx_prm_restore_irqen(u32 *saved_mask)
OMAP3_PRM_IRQENABLE_MPU_OFFSET);
}
/**
* omap3xxx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
*
* Clear any previously-latched I/O wakeup events and ensure that the
* I/O wakeup gates are aligned with the current mux settings. Works
* by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then
* deasserting WUCLKIN and clearing the ST_IO_CHAIN WKST bit. No
* return value.
*/
void omap3xxx_prm_reconfigure_io_chain(void)
{
int i = 0;
omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
PM_WKEN);
omap_test_timeout(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST) &
OMAP3430_ST_IO_CHAIN_MASK,
MAX_IOPAD_LATCH_TIME, i);
if (i == MAX_IOPAD_LATCH_TIME)
pr_warn("PRM: I/O chain clock line assertion timed out\n");
omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
PM_WKEN);
omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK, WKUP_MOD,
PM_WKST);
omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST);
}
/**
* omap3xxx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
*
* Activates the I/O wakeup event latches and allows events logged by
* those latches to signal a wakeup event to the PRCM. For I/O
* wakeups to occur, WAKEUPENABLE bits must be set in the pad mux
* registers, and omap3xxx_prm_reconfigure_io_chain() must be called.
* No return value.
*/
static void __init omap3xxx_prm_enable_io_wakeup(void)
{
if (omap3_has_io_wakeup())
omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
PM_WKEN);
}
static int __init omap3xxx_prcm_init(void)
{
int ret = 0;
if (cpu_is_omap34xx()) {
ret = omap_prcm_register_chain_handler(&omap3_prcm_irq_setup);
if (!ret)
irq_set_status_flags(omap_prcm_event_to_irq("io"),
IRQ_NOAUTOEN);
omap3xxx_prm_enable_io_wakeup();
return omap_prcm_register_chain_handler(&omap3_prcm_irq_setup);
}
return ret;
return 0;
}
subsys_initcall(omap3xxx_prcm_init);

6
arch/arm/mach-omap2/prm2xxx_3xxx.h
View file

@ -303,6 +303,8 @@ extern int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift);
extern int omap2_prm_assert_hardreset(s16 prm_mod, u8 shift);
extern int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift);
#endif /* CONFIG_ARCH_OMAP4 */
/* OMAP3-specific VP functions */
u32 omap3_prm_vp_check_txdone(u8 vp_id);
void omap3_prm_vp_clear_txdone(u8 vp_id);
@ -315,14 +317,14 @@ extern u32 omap3_prm_vcvp_read(u8 offset);
extern void omap3_prm_vcvp_write(u32 val, u8 offset);
extern u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset);
extern void omap3xxx_prm_reconfigure_io_chain(void);
/* PRM interrupt-related functions */
extern void omap3xxx_prm_read_pending_irqs(unsigned long *events);
extern void omap3xxx_prm_ocp_barrier(void);
extern void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask);
extern void omap3xxx_prm_restore_irqen(u32 *saved_mask);
#endif /* CONFIG_ARCH_OMAP4 */
#endif
/*

63
arch/arm/mach-omap2/prm44xx.c
View file

@ -233,10 +233,71 @@ void omap44xx_prm_restore_irqen(u32 *saved_mask)
OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
}
/**
* omap44xx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
*
* Clear any previously-latched I/O wakeup events and ensure that the
* I/O wakeup gates are aligned with the current mux settings. Works
* by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then
* deasserting WUCLKIN and waiting for WUCLKOUT to be deasserted.
* No return value. XXX Are the final two steps necessary?
*/
void omap44xx_prm_reconfigure_io_chain(void)
{
int i = 0;
/* Trigger WUCLKIN enable */
omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK,
OMAP4430_WUCLK_CTRL_MASK,
OMAP4430_PRM_DEVICE_INST,
OMAP4_PRM_IO_PMCTRL_OFFSET);
omap_test_timeout(
(((omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
OMAP4_PRM_IO_PMCTRL_OFFSET) &
OMAP4430_WUCLK_STATUS_MASK) >>
OMAP4430_WUCLK_STATUS_SHIFT) == 1),
MAX_IOPAD_LATCH_TIME, i);
if (i == MAX_IOPAD_LATCH_TIME)
pr_warn("PRM: I/O chain clock line assertion timed out\n");
/* Trigger WUCLKIN disable */
omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK, 0x0,
OMAP4430_PRM_DEVICE_INST,
OMAP4_PRM_IO_PMCTRL_OFFSET);
omap_test_timeout(
(((omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
OMAP4_PRM_IO_PMCTRL_OFFSET) &
OMAP4430_WUCLK_STATUS_MASK) >>
OMAP4430_WUCLK_STATUS_SHIFT) == 0),
MAX_IOPAD_LATCH_TIME, i);
if (i == MAX_IOPAD_LATCH_TIME)
pr_warn("PRM: I/O chain clock line deassertion timed out\n");
return;
}
/**
* omap44xx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
*
* Activates the I/O wakeup event latches and allows events logged by
* those latches to signal a wakeup event to the PRCM. For I/O wakeups
* to occur, WAKEUPENABLE bits must be set in the pad mux registers, and
* omap44xx_prm_reconfigure_io_chain() must be called. No return value.
*/
static void __init omap44xx_prm_enable_io_wakeup(void)
{
omap4_prm_rmw_inst_reg_bits(OMAP4430_GLOBAL_WUEN_MASK,
OMAP4430_GLOBAL_WUEN_MASK,
OMAP4430_PRM_DEVICE_INST,
OMAP4_PRM_IO_PMCTRL_OFFSET);
}
static int __init omap4xxx_prcm_init(void)
{
if (cpu_is_omap44xx())
if (cpu_is_omap44xx()) {
omap44xx_prm_enable_io_wakeup();
return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
}
return 0;
}
subsys_initcall(omap4xxx_prcm_init);

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

@ -763,6 +763,8 @@ extern u32 omap4_prm_vcvp_read(u8 offset);
extern void omap4_prm_vcvp_write(u32 val, u8 offset);
extern u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset);
extern void omap44xx_prm_reconfigure_io_chain(void);
/* PRM interrupt-related functions */
extern void omap44xx_prm_read_pending_irqs(unsigned long *events);
extern void omap44xx_prm_ocp_barrier(void);