powerpc/83xx/suspend: Save and restore SICRL, SICRH and SCCR

We need to save SICRL, SICRH and SCCR registers on suspend, and restore
them on resume. Otherwise, we lose IO and clocks setup on MPC8315E-RDB
boards when ULPI USB PHY is used (non-POR setup).
Signed-off-by: NAnton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: NScott Wood <scottwood@freescale.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

arch/powerpc/platforms/83xx/suspend.c

@@ -32,6 +32,7 @@
 #define PMCCR1_NEXT_STATE       0x0C /* Next state for power management */
 #define PMCCR1_NEXT_STATE_SHIFT 2
 #define PMCCR1_CURR_STATE       0x03 /* Current state for power management*/
+#define IMMR_SYSCR_OFFSET       0x100
 #define IMMR_RCW_OFFSET         0x900
 #define RCW_PCI_HOST            0x80000000
 
@@ -78,6 +79,22 @@ struct mpc83xx_clock {
 	u32 sccr;
 };
 
+struct mpc83xx_syscr {
+	__be32 sgprl;
+	__be32 sgprh;
+	__be32 spridr;
+	__be32 :32;
+	__be32 spcr;
+	__be32 sicrl;
+	__be32 sicrh;
+};
+
+struct mpc83xx_saved {
+	u32 sicrl;
+	u32 sicrh;
+	u32 sccr;
+};
+
 struct pmc_type {
 	int has_deep_sleep;
 };
@@ -87,6 +104,8 @@ static int has_deep_sleep, deep_sleeping;
 static int pmc_irq;
 static struct mpc83xx_pmc __iomem *pmc_regs;
 static struct mpc83xx_clock __iomem *clock_regs;
+static struct mpc83xx_syscr __iomem *syscr_regs;
+static struct mpc83xx_saved saved_regs;
 static int is_pci_agent, wake_from_pci;
 static phys_addr_t immrbase;
 static int pci_pm_state;
@@ -137,6 +156,20 @@ static irqreturn_t pmc_irq_handler(int irq, void *dev_id)
 	return ret;
 }
 
+static void mpc83xx_suspend_restore_regs(void)
+{
+	out_be32(&syscr_regs->sicrl, saved_regs.sicrl);
+	out_be32(&syscr_regs->sicrh, saved_regs.sicrh);
+	out_be32(&clock_regs->sccr, saved_regs.sccr);
+}
+
+static void mpc83xx_suspend_save_regs(void)
+{
+	saved_regs.sicrl = in_be32(&syscr_regs->sicrl);
+	saved_regs.sicrh = in_be32(&syscr_regs->sicrh);
+	saved_regs.sccr = in_be32(&clock_regs->sccr);
+}
+
 static int mpc83xx_suspend_enter(suspend_state_t state)
 {
 	int ret = -EAGAIN;
@@ -166,6 +199,8 @@ static int mpc83xx_suspend_enter(suspend_state_t state)
 	 */
 
 	if (deep_sleeping) {
+		mpc83xx_suspend_save_regs();
+
 		out_be32(&pmc_regs->mask, PMCER_ALL);
 
 		out_be32(&pmc_regs->config1,
@@ -179,6 +214,8 @@ static int mpc83xx_suspend_enter(suspend_state_t state)
 		         in_be32(&pmc_regs->config1) & ~PMCCR1_POWER_OFF);
 
 		out_be32(&pmc_regs->mask, PMCER_PMCI);
+
+		mpc83xx_suspend_restore_regs();
 	} else {
 		out_be32(&pmc_regs->mask, PMCER_PMCI);
 
@@ -333,12 +370,23 @@ static int pmc_probe(struct of_device *ofdev,
 		goto out_pmc;
 	}
 
+	if (has_deep_sleep) {
+		syscr_regs = ioremap(immrbase + IMMR_SYSCR_OFFSET,
+				     sizeof(*syscr_regs));
+		if (!syscr_regs) {
+			ret = -ENOMEM;
+			goto out_syscr;
+		}
+	}
+
 	if (is_pci_agent)
 		mpc83xx_set_agent();
 
 	suspend_set_ops(&mpc83xx_suspend_ops);
 	return 0;
 
+out_syscr:
+	iounmap(clock_regs);
 out_pmc:
 	iounmap(pmc_regs);
 out: