[PATCH] arch/arm/common/vic.c: code reorganization
H Hartley Sweeten
hartleys at visionengravers.com
Mon Dec 21 11:05:03 EST 2009
[ARM] 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.
Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ben Dooks <ben-linux at fluff.org>
Cc: Alessandro Rubini <rubini-list at gnudd.com>
Cc: Linus Walleij <linus.ml.walleij at gmail.com>
---
This patch had merge issues last time I posted it. Hopefully it works now.
Rebased on 2.6.33-rc1.
diff --git a/arch/arm/common/vic.c b/arch/arm/common/vic.c
index f232941..1cf999a 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);
- }
- }
-}
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