ARM: 5881/1: vic.c: reorganize code

This reorganizes the vic.c code in anticipation of a second patch
to use struct vic_device as the data stored in set_irq_chip_data().

The code now has the following flow:

1) struct vic_device definition, static variables, and to_vic()
   moved to the start of the code.
2) common code (vic_init2)
3) vic power management callbacks
4) vic power management initialization/registration
5) irq_chip callbacks
6) vendor specific vic initialization
7) vic initialization

In addition the typo vik_init_st is fixed (vic_init_st).

There is no functional change with this patch.

Tested-by: Linus Walleij <linus.walleij@stericsson.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Alessandro Rubini <rubini-list@gnudd.com>

Comments from Hartley Sweeten:

 Please change from Cc to:
 Tested-by: Alessandro Rubini <rubini@unipv.it>
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 132 insertions, 133 deletions

diff --git a/arch/arm/common/vic.c b/arch/arm/common/vic.c
index f232941de8a..1cf999ade4b 100644
--- a/arch/arm/common/vic.c
+++ b/arch/arm/common/vic.c
@@ -18,6 +18,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
+
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/io.h>
@@ -28,48 +29,6 @@
 #include <asm/mach/irq.h>
 #include <asm/hardware/vic.h>
 
-static void vic_ack_irq(unsigned int irq)
-{
-        void __iomem *base = get_irq_chip_data(irq);
-        irq &= 31;
-        writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
-        /* moreover, clear the soft-triggered, in case it was the reason */
-        writel(1 << irq, base + VIC_INT_SOFT_CLEAR);
-}
-
-static void vic_mask_irq(unsigned int irq)
-{
-        void __iomem *base = get_irq_chip_data(irq);
-        irq &= 31;
-        writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
-}
-
-static void vic_unmask_irq(unsigned int irq)
-{
-        void __iomem *base = get_irq_chip_data(irq);
-        irq &= 31;
-        writel(1 << irq, base + VIC_INT_ENABLE);
-}
-
-/**
- * vic_init2 - common initialisation code
- * @base: Base of the VIC.
- *
- * Common initialisation code for registeration
- * and resume.
-*/
-static void vic_init2(void __iomem *base)
-{
-        int i;
-
-        for (i = 0; i < 16; i++) {
-                void __iomem *reg = base + VIC_VECT_CNTL0 + (i * 4);
-                writel(VIC_VECT_CNTL_ENABLE | i, reg);
-        }
-
-        writel(32, base + VIC_PL190_DEF_VECT_ADDR);
-}
-
 #if defined(CONFIG_PM)
 /**
  * struct vic_device - VIC PM device
@@ -99,13 +58,34 @@ struct vic_device {
 /* we cannot allocate memory when VICs are initially registered */
 static struct vic_device vic_devices[CONFIG_ARM_VIC_NR];
 
+static int vic_id;
+
 static inline struct vic_device *to_vic(struct sys_device *sys)
 {
         return container_of(sys, struct vic_device, sysdev);
 }
+#endif /* CONFIG_PM */
 
-static int vic_id;
+/**
+ * vic_init2 - common initialisation code
+ * @base: Base of the VIC.
+ *
+ * Common initialisation code for registeration
+ * and resume.
+*/
+static void vic_init2(void __iomem *base)
+{
+        int i;
+
+        for (i = 0; i < 16; i++) {
+                void __iomem *reg = base + VIC_VECT_CNTL0 + (i * 4);
+                writel(VIC_VECT_CNTL_ENABLE | i, reg);
+        }
+
+        writel(32, base + VIC_PL190_DEF_VECT_ADDR);
+}
 
+#if defined(CONFIG_PM)
 static int vic_class_resume(struct sys_device *dev)
 {
         struct vic_device *vic = to_vic(dev);
@@ -159,31 +139,6 @@ struct sysdev_class vic_class = {
 };
 
 /**
- * vic_pm_register - Register a VIC for later power management control
- * @base: The base address of the VIC.
- * @irq: The base IRQ for the VIC.
- * @resume_sources: bitmask of interrupts allowed for resume sources.
- *
- * Register the VIC with the system device tree so that it can be notified
- * of suspend and resume requests and ensure that the correct actions are
- * taken to re-instate the settings on resume.
- */
-static void __init vic_pm_register(void __iomem *base, unsigned int irq, u32 resume_sources)
-{
-        struct vic_device *v;
-
-        if (vic_id >= ARRAY_SIZE(vic_devices))
-                printk(KERN_ERR "%s: too few VICs, increase CONFIG_ARM_VIC_NR\n", __func__);
-        else {
-                v = &vic_devices[vic_id];
-                v->base = base;
-                v->resume_sources = resume_sources;
-                v->irq = irq;
-                vic_id++;
-        }
-}
-
-/**
  * vic_pm_init - initicall to register VIC pm
  *
  * This is called via late_initcall() to register
@@ -219,9 +174,60 @@ static int __init vic_pm_init(void)
 
         return 0;
 }
-
 late_initcall(vic_pm_init);
 
+/**
+ * vic_pm_register - Register a VIC for later power management control
+ * @base: The base address of the VIC.
+ * @irq: The base IRQ for the VIC.
+ * @resume_sources: bitmask of interrupts allowed for resume sources.
+ *
+ * Register the VIC with the system device tree so that it can be notified
+ * of suspend and resume requests and ensure that the correct actions are
+ * taken to re-instate the settings on resume.
+ */
+static void __init vic_pm_register(void __iomem *base, unsigned int irq, u32 resume_sources)
+{
+        struct vic_device *v;
+
+        if (vic_id >= ARRAY_SIZE(vic_devices))
+                printk(KERN_ERR "%s: too few VICs, increase CONFIG_ARM_VIC_NR\n", __func__);
+        else {
+                v = &vic_devices[vic_id];
+                v->base = base;
+                v->resume_sources = resume_sources;
+                v->irq = irq;
+                vic_id++;
+        }
+}
+#else
+static inline void vic_pm_register(void __iomem *base, unsigned int irq, u32 arg1) { }
+#endif /* CONFIG_PM */
+
+static void vic_ack_irq(unsigned int irq)
+{
+        void __iomem *base = get_irq_chip_data(irq);
+        irq &= 31;
+        writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
+        /* moreover, clear the soft-triggered, in case it was the reason */
+        writel(1 << irq, base + VIC_INT_SOFT_CLEAR);
+}
+
+static void vic_mask_irq(unsigned int irq)
+{
+        void __iomem *base = get_irq_chip_data(irq);
+        irq &= 31;
+        writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
+}
+
+static void vic_unmask_irq(unsigned int irq)
+{
+        void __iomem *base = get_irq_chip_data(irq);
+        irq &= 31;
+        writel(1 << irq, base + VIC_INT_ENABLE);
+}
+
+#if defined(CONFIG_PM)
 static struct vic_device *vic_from_irq(unsigned int irq)
 {
         struct vic_device *v = vic_devices;
@@ -255,10 +261,7 @@ static int vic_set_wake(unsigned int irq, unsigned int on)
 
         return 0;
 }
-
 #else
-static inline void vic_pm_register(void __iomem *base, unsigned int irq, u32 arg1) { }
-
 #define vic_set_wake NULL
 #endif /* CONFIG_PM */
 
@@ -270,9 +273,62 @@ static struct irq_chip vic_chip = {
         .set_wake = vic_set_wake,
 };
 
-/* The PL190 cell from ARM has been modified by ST, so handle both here */
-static void vik_init_st(void __iomem *base, unsigned int irq_start,
-                         u32 vic_sources);
+/*
+ * The PL190 cell from ARM has been modified by ST to handle 64 interrupts.
+ * The original cell has 32 interrupts, while the modified one has 64,
+ * replocating two blocks 0x00..0x1f in 0x20..0x3f. In that case
+ * the probe function is called twice, with base set to offset 000
+ *  and 020 within the page. We call this "second block".
+ */
+static void __init vic_init_st(void __iomem *base, unsigned int irq_start,
+                                u32 vic_sources)
+{
+        unsigned int i;
+        int vic_2nd_block = ((unsigned long)base & ~PAGE_MASK) != 0;
+
+        /* Disable all interrupts initially. */
+
+        writel(0, base + VIC_INT_SELECT);
+        writel(0, base + VIC_INT_ENABLE);
+        writel(~0, base + VIC_INT_ENABLE_CLEAR);
+        writel(0, base + VIC_IRQ_STATUS);
+        writel(0, base + VIC_ITCR);
+        writel(~0, base + VIC_INT_SOFT_CLEAR);
+
+        /*
+         * Make sure we clear all existing interrupts. The vector registers
+         * in this cell are after the second block of general registers,
+         * so we can address them using standard offsets, but only from
+         * the second base address, which is 0x20 in the page
+         */
+        if (vic_2nd_block) {
+                writel(0, base + VIC_PL190_VECT_ADDR);
+                for (i = 0; i < 19; i++) {
+                        unsigned int value;
+
+                        value = readl(base + VIC_PL190_VECT_ADDR);
+                        writel(value, base + VIC_PL190_VECT_ADDR);
+                }
+                /* ST has 16 vectors as well, but we don't enable them by now */
+                for (i = 0; i < 16; i++) {
+                        void __iomem *reg = base + VIC_VECT_CNTL0 + (i * 4);
+                        writel(0, reg);
+                }
+
+                writel(32, base + VIC_PL190_DEF_VECT_ADDR);
+        }
+
+        for (i = 0; i < 32; i++) {
+                if (vic_sources & (1 << i)) {
+                        unsigned int irq = irq_start + i;
+
+                        set_irq_chip(irq, &vic_chip);
+                        set_irq_chip_data(irq, base);
+                        set_irq_handler(irq, handle_level_irq);
+                        set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+                }
+        }
+}
 
 /**
  * vic_init - initialise a vectored interrupt controller
@@ -299,7 +355,7 @@ void __init vic_init(void __iomem *base, unsigned int irq_start,
 
         switch(vendor) {
         case AMBA_VENDOR_ST:
-                vik_init_st(base, irq_start, vic_sources);
+                vic_init_st(base, irq_start, vic_sources);
                 return;
         default:
                 printk(KERN_WARNING "VIC: unknown vendor, continuing anyways\n");
@@ -343,60 +399,3 @@ void __init vic_init(void __iomem *base, unsigned int irq_start,
 
         vic_pm_register(base, irq_start, resume_sources);
 }
-
-/*
- * The PL190 cell from ARM has been modified by ST to handle 64 interrupts.
- * The original cell has 32 interrupts, while the modified one has 64,
- * replocating two blocks 0x00..0x1f in 0x20..0x3f. In that case
- * the probe function is called twice, with base set to offset 000
- *  and 020 within the page. We call this "second block".
- */
-static void __init vik_init_st(void __iomem *base, unsigned int irq_start,
-                                u32 vic_sources)
-{
-        unsigned int i;
-        int vic_2nd_block = ((unsigned long)base & ~PAGE_MASK) != 0;
-
-        /* Disable all interrupts initially. */
-
-        writel(0, base + VIC_INT_SELECT);
-        writel(0, base + VIC_INT_ENABLE);
-        writel(~0, base + VIC_INT_ENABLE_CLEAR);
-        writel(0, base + VIC_IRQ_STATUS);
-        writel(0, base + VIC_ITCR);
-        writel(~0, base + VIC_INT_SOFT_CLEAR);
-
-        /*
-         * Make sure we clear all existing interrupts. The vector registers
-         * in this cell are after the second block of general registers,
-         * so we can address them using standard offsets, but only from
-         * the second base address, which is 0x20 in the page
-         */
-        if (vic_2nd_block) {
-                writel(0, base + VIC_PL190_VECT_ADDR);
-                for (i = 0; i < 19; i++) {
-                        unsigned int value;
-
-                        value = readl(base + VIC_PL190_VECT_ADDR);
-                        writel(value, base + VIC_PL190_VECT_ADDR);
-                }
-                /* ST has 16 vectors as well, but we don't enable them by now */
-                for (i = 0; i < 16; i++) {
-                        void __iomem *reg = base + VIC_VECT_CNTL0 + (i * 4);
-                        writel(0, reg);
-                }
-
-                writel(32, base + VIC_PL190_DEF_VECT_ADDR);
-        }
-
-        for (i = 0; i < 32; i++) {
-                if (vic_sources & (1 << i)) {
-                        unsigned int irq = irq_start + i;
-
-                        set_irq_chip(irq, &vic_chip);
-                        set_irq_chip_data(irq, base);
-                        set_irq_handler(irq, handle_level_irq);
-                        set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
-                }
-        }
-}