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-rw-r--r--arch/arm/mach-omap2/pm-debug.c4
-rw-r--r--arch/arm/mach-omap2/pm34xx.c187
-rw-r--r--arch/arm/mach-omap2/powerdomain.c39
-rw-r--r--arch/arm/plat-omap/include/mach/powerdomain.h2
4 files changed, 137 insertions, 95 deletions
diff --git a/arch/arm/mach-omap2/pm-debug.c b/arch/arm/mach-omap2/pm-debug.c
index 1b4c1600f8d..2fc4d6abbd0 100644
--- a/arch/arm/mach-omap2/pm-debug.c
+++ b/arch/arm/mach-omap2/pm-debug.c
@@ -541,7 +541,7 @@ static int __init pm_dbg_init(void)
printk(KERN_ERR "%s: only OMAP3 supported\n", __func__);
return -ENODEV;
}
-
+
d = debugfs_create_dir("pm_debug", NULL);
if (IS_ERR(d))
return PTR_ERR(d);
@@ -551,7 +551,7 @@ static int __init pm_dbg_init(void)
(void) debugfs_create_file("time", S_IRUGO,
d, (void *)DEBUG_FILE_TIMERS, &debug_fops);
- pwrdm_for_each(pwrdms_setup, (void *)d);
+ pwrdm_for_each_nolock(pwrdms_setup, (void *)d);
pm_dbg_dir = debugfs_create_dir("registers", d);
if (IS_ERR(pm_dbg_dir))
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 0ff5a6c53aa..378c2f61835 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -51,97 +51,112 @@ static void (*_omap_sram_idle)(u32 *addr, int save_state);
static struct powerdomain *mpu_pwrdm;
-/* PRCM Interrupt Handler for wakeups */
-static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
+/*
+ * PRCM Interrupt Handler Helper Function
+ *
+ * The purpose of this function is to clear any wake-up events latched
+ * in the PRCM PM_WKST_x registers. It is possible that a wake-up event
+ * may occur whilst attempting to clear a PM_WKST_x register and thus
+ * set another bit in this register. A while loop is used to ensure
+ * that any peripheral wake-up events occurring while attempting to
+ * clear the PM_WKST_x are detected and cleared.
+ */
+static int prcm_clear_mod_irqs(s16 module, u8 regs)
{
- u32 wkst, irqstatus_mpu;
- u32 fclk, iclk;
-
- /* WKUP */
- wkst = prm_read_mod_reg(WKUP_MOD, PM_WKST);
+ u32 wkst, fclk, iclk, clken;
+ u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
+ u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
+ u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
+ u16 grpsel_off = (regs == 3) ?
+ OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
+ int c = 0;
+
+ wkst = prm_read_mod_reg(module, wkst_off);
+ wkst &= prm_read_mod_reg(module, grpsel_off);
if (wkst) {
- iclk = cm_read_mod_reg(WKUP_MOD, CM_ICLKEN);
- fclk = cm_read_mod_reg(WKUP_MOD, CM_FCLKEN);
- cm_set_mod_reg_bits(wkst, WKUP_MOD, CM_ICLKEN);
- cm_set_mod_reg_bits(wkst, WKUP_MOD, CM_FCLKEN);
- prm_write_mod_reg(wkst, WKUP_MOD, PM_WKST);
- while (prm_read_mod_reg(WKUP_MOD, PM_WKST))
- cpu_relax();
- cm_write_mod_reg(iclk, WKUP_MOD, CM_ICLKEN);
- cm_write_mod_reg(fclk, WKUP_MOD, CM_FCLKEN);
+ iclk = cm_read_mod_reg(module, iclk_off);
+ fclk = cm_read_mod_reg(module, fclk_off);
+ while (wkst) {
+ clken = wkst;
+ cm_set_mod_reg_bits(clken, module, iclk_off);
+ /*
+ * For USBHOST, we don't know whether HOST1 or
+ * HOST2 woke us up, so enable both f-clocks
+ */
+ if (module == OMAP3430ES2_USBHOST_MOD)
+ clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
+ cm_set_mod_reg_bits(clken, module, fclk_off);
+ prm_write_mod_reg(wkst, module, wkst_off);
+ wkst = prm_read_mod_reg(module, wkst_off);
+ c++;
+ }
+ cm_write_mod_reg(iclk, module, iclk_off);
+ cm_write_mod_reg(fclk, module, fclk_off);
}
- /* CORE */
- wkst = prm_read_mod_reg(CORE_MOD, PM_WKST1);
- if (wkst) {
- iclk = cm_read_mod_reg(CORE_MOD, CM_ICLKEN1);
- fclk = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
- cm_set_mod_reg_bits(wkst, CORE_MOD, CM_ICLKEN1);
- cm_set_mod_reg_bits(wkst, CORE_MOD, CM_FCLKEN1);
- prm_write_mod_reg(wkst, CORE_MOD, PM_WKST1);
- while (prm_read_mod_reg(CORE_MOD, PM_WKST1))
- cpu_relax();
- cm_write_mod_reg(iclk, CORE_MOD, CM_ICLKEN1);
- cm_write_mod_reg(fclk, CORE_MOD, CM_FCLKEN1);
- }
- wkst = prm_read_mod_reg(CORE_MOD, OMAP3430ES2_PM_WKST3);
- if (wkst) {
- iclk = cm_read_mod_reg(CORE_MOD, CM_ICLKEN3);
- fclk = cm_read_mod_reg(CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
- cm_set_mod_reg_bits(wkst, CORE_MOD, CM_ICLKEN3);
- cm_set_mod_reg_bits(wkst, CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
- prm_write_mod_reg(wkst, CORE_MOD, OMAP3430ES2_PM_WKST3);
- while (prm_read_mod_reg(CORE_MOD, OMAP3430ES2_PM_WKST3))
- cpu_relax();
- cm_write_mod_reg(iclk, CORE_MOD, CM_ICLKEN3);
- cm_write_mod_reg(fclk, CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
- }
+ return c;
+}
- /* PER */
- wkst = prm_read_mod_reg(OMAP3430_PER_MOD, PM_WKST);
- if (wkst) {
- iclk = cm_read_mod_reg(OMAP3430_PER_MOD, CM_ICLKEN);
- fclk = cm_read_mod_reg(OMAP3430_PER_MOD, CM_FCLKEN);
- cm_set_mod_reg_bits(wkst, OMAP3430_PER_MOD, CM_ICLKEN);
- cm_set_mod_reg_bits(wkst, OMAP3430_PER_MOD, CM_FCLKEN);
- prm_write_mod_reg(wkst, OMAP3430_PER_MOD, PM_WKST);
- while (prm_read_mod_reg(OMAP3430_PER_MOD, PM_WKST))
- cpu_relax();
- cm_write_mod_reg(iclk, OMAP3430_PER_MOD, CM_ICLKEN);
- cm_write_mod_reg(fclk, OMAP3430_PER_MOD, CM_FCLKEN);
- }
+static int _prcm_int_handle_wakeup(void)
+{
+ int c;
+ c = prcm_clear_mod_irqs(WKUP_MOD, 1);
+ c += prcm_clear_mod_irqs(CORE_MOD, 1);
+ c += prcm_clear_mod_irqs(OMAP3430_PER_MOD, 1);
if (omap_rev() > OMAP3430_REV_ES1_0) {
- /* USBHOST */
- wkst = prm_read_mod_reg(OMAP3430ES2_USBHOST_MOD, PM_WKST);
- if (wkst) {
- iclk = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
- CM_ICLKEN);
- fclk = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
- CM_FCLKEN);
- cm_set_mod_reg_bits(wkst, OMAP3430ES2_USBHOST_MOD,
- CM_ICLKEN);
- cm_set_mod_reg_bits(wkst, OMAP3430ES2_USBHOST_MOD,
- CM_FCLKEN);
- prm_write_mod_reg(wkst, OMAP3430ES2_USBHOST_MOD,
- PM_WKST);
- while (prm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
- PM_WKST))
- cpu_relax();
- cm_write_mod_reg(iclk, OMAP3430ES2_USBHOST_MOD,
- CM_ICLKEN);
- cm_write_mod_reg(fclk, OMAP3430ES2_USBHOST_MOD,
- CM_FCLKEN);
- }
+ c += prcm_clear_mod_irqs(CORE_MOD, 3);
+ c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1);
}
- irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
- OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
- prm_write_mod_reg(irqstatus_mpu, OCP_MOD,
- OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
+ return c;
+}
+
+/*
+ * PRCM Interrupt Handler
+ *
+ * The PRM_IRQSTATUS_MPU register indicates if there are any pending
+ * interrupts from the PRCM for the MPU. These bits must be cleared in
+ * order to clear the PRCM interrupt. The PRCM interrupt handler is
+ * implemented to simply clear the PRM_IRQSTATUS_MPU in order to clear
+ * the PRCM interrupt. Please note that bit 0 of the PRM_IRQSTATUS_MPU
+ * register indicates that a wake-up event is pending for the MPU and
+ * this bit can only be cleared if the all the wake-up events latched
+ * in the various PM_WKST_x registers have been cleared. The interrupt
+ * handler is implemented using a do-while loop so that if a wake-up
+ * event occurred during the processing of the prcm interrupt handler
+ * (setting a bit in the corresponding PM_WKST_x register and thus
+ * preventing us from clearing bit 0 of the PRM_IRQSTATUS_MPU register)
+ * this would be handled.
+ */
+static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
+{
+ u32 irqstatus_mpu;
+ int c = 0;
+
+ do {
+ irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
+ OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
+
+ if (irqstatus_mpu & (OMAP3430_WKUP_ST | OMAP3430_IO_ST)) {
+ c = _prcm_int_handle_wakeup();
+
+ /*
+ * Is the MPU PRCM interrupt handler racing with the
+ * IVA2 PRCM interrupt handler ?
+ */
+ WARN(c == 0, "prcm: WARNING: PRCM indicated MPU wakeup "
+ "but no wakeup sources are marked\n");
+ } else {
+ /* XXX we need to expand our PRCM interrupt handler */
+ WARN(1, "prcm: WARNING: PRCM interrupt received, but "
+ "no code to handle it (%08x)\n", irqstatus_mpu);
+ }
+
+ prm_write_mod_reg(irqstatus_mpu, OCP_MOD,
+ OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
- while (prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET))
- cpu_relax();
+ } while (prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET));
return IRQ_HANDLED;
}
@@ -624,6 +639,16 @@ static void __init prcm_setup_regs(void)
prm_write_mod_reg(OMAP3430_IO_EN | OMAP3430_WKUP_EN,
OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
+ /* Enable GPIO wakeups in PER */
+ prm_write_mod_reg(OMAP3430_EN_GPIO2 | OMAP3430_EN_GPIO3 |
+ OMAP3430_EN_GPIO4 | OMAP3430_EN_GPIO5 |
+ OMAP3430_EN_GPIO6, OMAP3430_PER_MOD, PM_WKEN);
+ /* and allow them to wake up MPU */
+ prm_write_mod_reg(OMAP3430_GRPSEL_GPIO2 | OMAP3430_EN_GPIO3 |
+ OMAP3430_GRPSEL_GPIO4 | OMAP3430_EN_GPIO5 |
+ OMAP3430_GRPSEL_GPIO6,
+ OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL);
+
/* Don't attach IVA interrupts */
prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 2594cbff394..f00289abd30 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -273,35 +273,50 @@ struct powerdomain *pwrdm_lookup(const char *name)
}
/**
- * pwrdm_for_each - call function on each registered clockdomain
+ * pwrdm_for_each_nolock - call function on each registered clockdomain
* @fn: callback function *
*
* Call the supplied function for each registered powerdomain. The
* callback function can return anything but 0 to bail out early from
- * the iterator. The callback function is called with the pwrdm_rwlock
- * held for reading, so no powerdomain structure manipulation
- * functions should be called from the callback, although hardware
- * powerdomain control functions are fine. Returns the last return
- * value of the callback function, which should be 0 for success or
- * anything else to indicate failure; or -EINVAL if the function
- * pointer is null.
+ * the iterator. Returns the last return value of the callback function, which
+ * should be 0 for success or anything else to indicate failure; or -EINVAL if
+ * the function pointer is null.
*/
-int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
- void *user)
+int pwrdm_for_each_nolock(int (*fn)(struct powerdomain *pwrdm, void *user),
+ void *user)
{
struct powerdomain *temp_pwrdm;
- unsigned long flags;
int ret = 0;
if (!fn)
return -EINVAL;
- read_lock_irqsave(&pwrdm_rwlock, flags);
list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
ret = (*fn)(temp_pwrdm, user);
if (ret)
break;
}
+
+ return ret;
+}
+
+/**
+ * pwrdm_for_each - call function on each registered clockdomain
+ * @fn: callback function *
+ *
+ * This function is the same as 'pwrdm_for_each_nolock()', but keeps the
+ * &pwrdm_rwlock locked for reading, so no powerdomain structure manipulation
+ * functions should be called from the callback, although hardware powerdomain
+ * control functions are fine.
+ */
+int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
+ void *user)
+{
+ unsigned long flags;
+ int ret;
+
+ read_lock_irqsave(&pwrdm_rwlock, flags);
+ ret = pwrdm_for_each_nolock(fn, user);
read_unlock_irqrestore(&pwrdm_rwlock, flags);
return ret;
diff --git a/arch/arm/plat-omap/include/mach/powerdomain.h b/arch/arm/plat-omap/include/mach/powerdomain.h
index 6271d8556a4..fa6461423bd 100644
--- a/arch/arm/plat-omap/include/mach/powerdomain.h
+++ b/arch/arm/plat-omap/include/mach/powerdomain.h
@@ -135,6 +135,8 @@ struct powerdomain *pwrdm_lookup(const char *name);
int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
void *user);
+int pwrdm_for_each_nolock(int (*fn)(struct powerdomain *pwrdm, void *user),
+ void *user);
int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm);
int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-08 17:53:40 +0000