Merge branch 'tk_prm_chain_handler_devel_3.3' of git://git.pwsan.com/linux-2.6 into prcm

Conflicts:
	arch/arm/mach-omap2/Makefile

1 files changed, 44 insertions, 71 deletions

diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index fa637dfdda5..53b5b1a71e0 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -195,7 +195,7 @@ static void omap3_save_secure_ram_context(void)
  * 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)
+static int prcm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits)
 {
 	u32 wkst, fclk, iclk, clken;
 	u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
@@ -207,6 +207,7 @@ static int prcm_clear_mod_irqs(s16 module, u8 regs)
 
 	wkst = omap2_prm_read_mod_reg(module, wkst_off);
 	wkst &= omap2_prm_read_mod_reg(module, grpsel_off);
+	wkst &= ~ignore_bits;
 	if (wkst) {
 		iclk = omap2_cm_read_mod_reg(module, iclk_off);
 		fclk = omap2_cm_read_mod_reg(module, fclk_off);
@@ -222,6 +223,7 @@ static int prcm_clear_mod_irqs(s16 module, u8 regs)
 			omap2_cm_set_mod_reg_bits(clken, module, fclk_off);
 			omap2_prm_write_mod_reg(wkst, module, wkst_off);
 			wkst = omap2_prm_read_mod_reg(module, wkst_off);
+			wkst &= ~ignore_bits;
 			c++;
 		}
 		omap2_cm_write_mod_reg(iclk, module, iclk_off);
@@ -231,76 +233,35 @@ static int prcm_clear_mod_irqs(s16 module, u8 regs)
 	return c;
 }
 
-static int _prcm_int_handle_wakeup(void)
+static irqreturn_t _prcm_int_handle_io(int irq, void *unused)
 {
 	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) {
-		c += prcm_clear_mod_irqs(CORE_MOD, 3);
-		c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1);
-	}
+	c = prcm_clear_mod_irqs(WKUP_MOD, 1,
+		~(OMAP3430_ST_IO_MASK | OMAP3430_ST_IO_CHAIN_MASK));
 
-	return c;
+	return c ? IRQ_HANDLED : IRQ_NONE;
 }
 
-/*
- * 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)
+static irqreturn_t _prcm_int_handle_wakeup(int irq, void *unused)
 {
-	u32 irqenable_mpu, irqstatus_mpu;
-	int c = 0;
-
-	irqenable_mpu = omap2_prm_read_mod_reg(OCP_MOD,
-					 OMAP3_PRM_IRQENABLE_MPU_OFFSET);
-	irqstatus_mpu = omap2_prm_read_mod_reg(OCP_MOD,
-					 OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
-	irqstatus_mpu &= irqenable_mpu;
-
-	do {
-		if (irqstatus_mpu & (OMAP3430_WKUP_ST_MASK |
-				     OMAP3430_IO_ST_MASK)) {
-			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);
-		}
-
-		omap2_prm_write_mod_reg(irqstatus_mpu, OCP_MOD,
-					OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
-
-		irqstatus_mpu = omap2_prm_read_mod_reg(OCP_MOD,
-					OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
-		irqstatus_mpu &= irqenable_mpu;
+	int c;
 
-	} while (irqstatus_mpu);
+	/*
+	 * Clear all except ST_IO and ST_IO_CHAIN for wkup module,
+	 * these are handled in a separate handler to avoid acking
+	 * IO events before parsing in mux code
+	 */
+	c = prcm_clear_mod_irqs(WKUP_MOD, 1,
+		OMAP3430_ST_IO_MASK | OMAP3430_ST_IO_CHAIN_MASK);
+	c += prcm_clear_mod_irqs(CORE_MOD, 1, 0);
+	c += prcm_clear_mod_irqs(OMAP3430_PER_MOD, 1, 0);
+	if (omap_rev() > OMAP3430_REV_ES1_0) {
+		c += prcm_clear_mod_irqs(CORE_MOD, 3, 0);
+		c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1, 0);
+	}
 
-	return IRQ_HANDLED;
+	return c ? IRQ_HANDLED : IRQ_NONE;
 }
 
 static void omap34xx_save_context(u32 *save)
@@ -581,6 +542,7 @@ static int omap3_pm_begin(suspend_state_t state)
 	disable_hlt();
 	suspend_state = state;
 	omap_uart_enable_irqs(0);
+	omap_prcm_irq_prepare();
 	return 0;
 }
 
@@ -592,10 +554,16 @@ static void omap3_pm_end(void)
 	return;
 }
 
+static void omap3_pm_finish(void)
+{
+	omap_prcm_irq_complete();
+}
+
 static const struct platform_suspend_ops omap_pm_ops = {
 	.begin		= omap3_pm_begin,
 	.end		= omap3_pm_end,
 	.enter		= omap3_pm_enter,
+	.finish		= omap3_pm_finish,
 	.valid		= suspend_valid_only_mem,
 };
 #endif /* CONFIG_SUSPEND */
@@ -701,10 +669,6 @@ static void __init prcm_setup_regs(void)
 			  OMAP3430_GRPSEL_GPT1_MASK |
 			  OMAP3430_GRPSEL_GPT12_MASK,
 			  WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
-	/* For some reason IO doesn't generate wakeup event even if
-	 * it is selected to mpu wakeup goup */
-	omap2_prm_write_mod_reg(OMAP3430_IO_EN_MASK | OMAP3430_WKUP_EN_MASK,
-			  OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
 
 	/* Enable PM_WKEN to support DSS LPR */
 	omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK,
@@ -881,12 +845,21 @@ static int __init omap3_pm_init(void)
 	 * supervised mode for powerdomains */
 	prcm_setup_regs();
 
-	ret = request_irq(INT_34XX_PRCM_MPU_IRQ,
-			  (irq_handler_t)prcm_interrupt_handler,
-			  IRQF_DISABLED, "prcm", NULL);
+	ret = request_irq(omap_prcm_event_to_irq("wkup"),
+		_prcm_int_handle_wakeup, IRQF_NO_SUSPEND, "pm_wkup", NULL);
+
+	if (ret) {
+		pr_err("pm: Failed to request pm_wkup irq\n");
+		goto err1;
+	}
+
+	/* IO interrupt is shared with mux code */
+	ret = request_irq(omap_prcm_event_to_irq("io"),
+		_prcm_int_handle_io, IRQF_SHARED | IRQF_NO_SUSPEND, "pm_io",
+		omap3_pm_init);
+
 	if (ret) {
-		printk(KERN_ERR "request_irq failed to register for 0x%x\n",
-		       INT_34XX_PRCM_MPU_IRQ);
+		pr_err("pm: Failed to request pm_io irq\n");
 		goto err1;
 	}