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ARM: OMAP3: PM: Move IO Daisychain function to omap3 prm file

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Since IO Daisychain modifies only PRM registers, it makes sense to move
it to PRM File. Also changed the timeout value for IO chain enable to
100us and added a wait for status disable at the end.

Thanks to Nishanth Menon <nm@ti.com> for contributing a fix to the
timeout code waiting for WUCLKOUT to go high.

Signed-off-by: Vishwanath BS <vishwanath.bs@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Cc: Nishanth Menon <nm@ti.com>
Reviewed-by: Rajendra Nayak <rnayak@ti.com>
[paul@pwsan.com: renamed omap3_trigger_io_chain() to better describe the
 end result and to match other PRM functions; removed
 omap3_disable_io_chain(); moved MAX_IOPAD_LATCH_TIME to prcm-common as it
 will also be used by the OMAP4 code; removed unnecessary barrier;
 added kerneldoc; added credit for fix from Nishanth]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Vishwanath BS 2012-06-22 08:40:02 -06:00 committed by Paul Walmsley
parent fe7ea0062f
commit 09659fa72b
4 changed files with 43 additions and 33 deletions
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35
arch/arm/mach-omap2/pm34xx.c
View file

@ -72,34 +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_WKST) &
OMAP3430_ST_IO_CHAIN_MASK)) {
timeout++;
if (timeout > 1000) {
pr_err("Wake up daisy chain activation failed.\n");
return;
}
}
omap2_prm_clear_mod_reg_bits(OMAP3430_EN_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();
@ -305,7 +277,7 @@ void omap_sram_idle(void)
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();
omap3xxx_prm_reconfigure_io_chain();
}
pwrdm_pre_transition();
@ -382,12 +354,9 @@ void omap_sram_idle(void)
/* Disable IO-PAD and IO-CHAIN wakeup */
if (omap3_has_io_wakeup() &&
(per_next_state < PWRDM_POWER_ON ||
core_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;

31
arch/arm/mach-omap2/prm2xxx_3xxx.c
View file

@ -301,6 +301,37 @@ 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);
}
static int __init omap3xxx_prcm_init(void)
{
if (cpu_is_omap34xx())

2
arch/arm/mach-omap2/prm2xxx_3xxx.h
View file

@ -317,6 +317,8 @@ 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);