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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/irqchip/irq-bcm2835.c
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/irqchip/irq-bcm2835.c')
-rw-r--r--kernel/drivers/irqchip/irq-bcm2835.c115
1 files changed, 76 insertions, 39 deletions
diff --git a/kernel/drivers/irqchip/irq-bcm2835.c b/kernel/drivers/irqchip/irq-bcm2835.c
index 5916d6cda..bf9cc5f2e 100644
--- a/kernel/drivers/irqchip/irq-bcm2835.c
+++ b/kernel/drivers/irqchip/irq-bcm2835.c
@@ -48,13 +48,12 @@
#include <linux/slab.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
+#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <asm/exception.h>
#include <asm/mach/irq.h>
-#include "irqchip.h"
-
/* Put the bank and irq (32 bits) into the hwirq */
#define MAKE_HWIRQ(b, n) ((b << 5) | (n))
#define HWIRQ_BANK(i) (i >> 5)
@@ -76,10 +75,10 @@
#define NR_BANKS 3
#define IRQS_PER_BANK 32
-static int reg_pending[] __initconst = { 0x00, 0x04, 0x08 };
-static int reg_enable[] __initconst = { 0x18, 0x10, 0x14 };
-static int reg_disable[] __initconst = { 0x24, 0x1c, 0x20 };
-static int bank_irqs[] __initconst = { 8, 32, 32 };
+static const int reg_pending[] __initconst = { 0x00, 0x04, 0x08 };
+static const int reg_enable[] __initconst = { 0x18, 0x10, 0x14 };
+static const int reg_disable[] __initconst = { 0x24, 0x1c, 0x20 };
+static const int bank_irqs[] __initconst = { 8, 32, 32 };
static const int shortcuts[] = {
7, 9, 10, 18, 19, /* Bank 1 */
@@ -97,6 +96,7 @@ struct armctrl_ic {
static struct armctrl_ic intc __read_mostly;
static void __exception_irq_entry bcm2835_handle_irq(
struct pt_regs *regs);
+static void bcm2836_chained_handle_irq(struct irq_desc *desc);
static void armctrl_mask_irq(struct irq_data *d)
{
@@ -135,12 +135,13 @@ static int armctrl_xlate(struct irq_domain *d, struct device_node *ctrlr,
return 0;
}
-static struct irq_domain_ops armctrl_ops = {
+static const struct irq_domain_ops armctrl_ops = {
.xlate = armctrl_xlate
};
static int __init armctrl_of_init(struct device_node *node,
- struct device_node *parent)
+ struct device_node *parent,
+ bool is_2836)
{
void __iomem *base;
int irq, b, i;
@@ -165,58 +166,94 @@ static int __init armctrl_of_init(struct device_node *node,
BUG_ON(irq <= 0);
irq_set_chip_and_handler(irq, &armctrl_chip,
handle_level_irq);
- set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+ irq_set_probe(irq);
+ }
+ }
+
+ if (is_2836) {
+ int parent_irq = irq_of_parse_and_map(node, 0);
+
+ if (!parent_irq) {
+ panic("%s: unable to get parent interrupt.\n",
+ node->full_name);
}
+ irq_set_chained_handler(parent_irq, bcm2836_chained_handle_irq);
+ } else {
+ set_handle_irq(bcm2835_handle_irq);
}
- set_handle_irq(bcm2835_handle_irq);
return 0;
}
+static int __init bcm2835_armctrl_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ return armctrl_of_init(node, parent, false);
+}
+
+static int __init bcm2836_armctrl_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ return armctrl_of_init(node, parent, true);
+}
+
+
/*
* Handle each interrupt across the entire interrupt controller. This reads the
* status register before handling each interrupt, which is necessary given that
* handle_IRQ may briefly re-enable interrupts for soft IRQ handling.
*/
-static void armctrl_handle_bank(int bank, struct pt_regs *regs)
+static u32 armctrl_translate_bank(int bank)
{
- u32 stat, irq;
+ u32 stat = readl_relaxed(intc.pending[bank]);
- while ((stat = readl_relaxed(intc.pending[bank]))) {
- irq = MAKE_HWIRQ(bank, ffs(stat) - 1);
- handle_IRQ(irq_linear_revmap(intc.domain, irq), regs);
- }
+ return MAKE_HWIRQ(bank, ffs(stat) - 1);
+}
+
+static u32 armctrl_translate_shortcut(int bank, u32 stat)
+{
+ return MAKE_HWIRQ(bank, shortcuts[ffs(stat >> SHORTCUT_SHIFT) - 1]);
}
-static void armctrl_handle_shortcut(int bank, struct pt_regs *regs,
- u32 stat)
+static u32 get_next_armctrl_hwirq(void)
{
- u32 irq = MAKE_HWIRQ(bank, shortcuts[ffs(stat >> SHORTCUT_SHIFT) - 1]);
- handle_IRQ(irq_linear_revmap(intc.domain, irq), regs);
+ u32 stat = readl_relaxed(intc.pending[0]) & BANK0_VALID_MASK;
+
+ if (stat == 0)
+ return ~0;
+ else if (stat & BANK0_HWIRQ_MASK)
+ return MAKE_HWIRQ(0, ffs(stat & BANK0_HWIRQ_MASK) - 1);
+ else if (stat & SHORTCUT1_MASK)
+ return armctrl_translate_shortcut(1, stat & SHORTCUT1_MASK);
+ else if (stat & SHORTCUT2_MASK)
+ return armctrl_translate_shortcut(2, stat & SHORTCUT2_MASK);
+ else if (stat & BANK1_HWIRQ)
+ return armctrl_translate_bank(1);
+ else if (stat & BANK2_HWIRQ)
+ return armctrl_translate_bank(2);
+ else
+ BUG();
}
static void __exception_irq_entry bcm2835_handle_irq(
struct pt_regs *regs)
{
- u32 stat, irq;
-
- while ((stat = readl_relaxed(intc.pending[0]) & BANK0_VALID_MASK)) {
- if (stat & BANK0_HWIRQ_MASK) {
- irq = MAKE_HWIRQ(0, ffs(stat & BANK0_HWIRQ_MASK) - 1);
- handle_IRQ(irq_linear_revmap(intc.domain, irq), regs);
- } else if (stat & SHORTCUT1_MASK) {
- armctrl_handle_shortcut(1, regs, stat & SHORTCUT1_MASK);
- } else if (stat & SHORTCUT2_MASK) {
- armctrl_handle_shortcut(2, regs, stat & SHORTCUT2_MASK);
- } else if (stat & BANK1_HWIRQ) {
- armctrl_handle_bank(1, regs);
- } else if (stat & BANK2_HWIRQ) {
- armctrl_handle_bank(2, regs);
- } else {
- BUG();
- }
- }
+ u32 hwirq;
+
+ while ((hwirq = get_next_armctrl_hwirq()) != ~0)
+ handle_IRQ(irq_linear_revmap(intc.domain, hwirq), regs);
+}
+
+static void bcm2836_chained_handle_irq(struct irq_desc *desc)
+{
+ u32 hwirq;
+
+ while ((hwirq = get_next_armctrl_hwirq()) != ~0)
+ generic_handle_irq(irq_linear_revmap(intc.domain, hwirq));
}
-IRQCHIP_DECLARE(bcm2835_armctrl_ic, "brcm,bcm2835-armctrl-ic", armctrl_of_init);
+IRQCHIP_DECLARE(bcm2835_armctrl_ic, "brcm,bcm2835-armctrl-ic",
+ bcm2835_armctrl_of_init);
+IRQCHIP_DECLARE(bcm2836_armctrl_ic, "brcm,bcm2836-armctrl-ic",
+ bcm2836_armctrl_of_init);