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-rw-r--r--arch/arm/common/vic.c95
1 files changed, 94 insertions, 1 deletions
diff --git a/arch/arm/common/vic.c b/arch/arm/common/vic.c
index 6ed89836e90..920ced0b73c 100644
--- a/arch/arm/common/vic.c
+++ b/arch/arm/common/vic.c
@@ -22,10 +22,20 @@
#include <linux/list.h>
#include <linux/io.h>
#include <linux/sysdev.h>
+#include <linux/amba/bus.h>
#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);
@@ -253,12 +263,16 @@ static inline void vic_pm_register(void __iomem *base, unsigned int irq, u32 arg
static struct irq_chip vic_chip = {
.name = "VIC",
- .ack = vic_mask_irq,
+ .ack = vic_ack_irq,
.mask = vic_mask_irq,
.unmask = vic_unmask_irq,
.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);
+
/**
* vic_init - initialise a vectored interrupt controller
* @base: iomem base address
@@ -270,6 +284,28 @@ void __init vic_init(void __iomem *base, unsigned int irq_start,
u32 vic_sources, u32 resume_sources)
{
unsigned int i;
+ u32 cellid = 0;
+ enum amba_vendor vendor;
+
+ /* Identify which VIC cell this one is, by reading the ID */
+ for (i = 0; i < 4; i++) {
+ u32 addr = ((u32)base & PAGE_MASK) + 0xfe0 + (i * 4);
+ cellid |= (readl(addr) & 0xff) << (8 * i);
+ }
+ vendor = (cellid >> 12) & 0xff;
+ printk(KERN_INFO "VIC @%p: id 0x%08x, vendor 0x%02x\n",
+ base, cellid, vendor);
+
+ switch(vendor) {
+ case AMBA_VENDOR_ST:
+ vik_init_st(base, irq_start, vic_sources);
+ return;
+ default:
+ printk(KERN_WARNING "VIC: unknown vendor, continuing anyways\n");
+ /* fall through */
+ case AMBA_VENDOR_ARM:
+ break;
+ }
/* Disable all interrupts initially. */
@@ -306,3 +342,60 @@ 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);
+ }
+ }
+}