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Subject[PATCH 3/7] irqchip/irq-bcm2835: Add support for 7211 interrupt controller
Date
BCM7211 has a number of similarities with BCM2836, except the register
offsets are different and the bank bits are also different, account for
all of these differences.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/irqchip/irq-bcm2835.c | 86 +++++++++++++++++++++++++++++------
1 file changed, 72 insertions(+), 14 deletions(-)

diff --git a/drivers/irqchip/irq-bcm2835.c b/drivers/irqchip/irq-bcm2835.c
index 418245d31921..55afc3487723 100644
--- a/drivers/irqchip/irq-bcm2835.c
+++ b/drivers/irqchip/irq-bcm2835.c
@@ -57,19 +57,34 @@
#define SHORTCUT_SHIFT 10
#define BANK1_HWIRQ BIT(8)
#define BANK2_HWIRQ BIT(9)
+#define BANK1_HWIRQ_BCM7211 BIT(24)
+#define BANK2_HWIRQ_BCM7211 BIT(25)
#define BANK0_VALID_MASK (BANK0_HWIRQ_MASK | BANK1_HWIRQ | BANK2_HWIRQ \
| SHORTCUT1_MASK | SHORTCUT2_MASK)
+#define BANK0_VALID_MASK_BCM7211 (BANK0_HWIRQ_MASK | BANK1_HWIRQ_BCM7211 | \
+ BANK2_HWIRQ_BCM7211 | SHORTCUT1_MASK | \
+ SHORTCUT2_MASK)

#define REG_FIQ_CONTROL 0x0c

#define NR_BANKS 3
#define IRQS_PER_BANK 32

+enum armctrl_type {
+ ARMCTRL_BCM2835 = 0,
+ ARMCTRL_BCM2836,
+ ARMCTRL_BCM7211
+};
+
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 reg_pending_bcm7211[] __initconst = { 0x08, 0x00, 0x04 };
+static const int reg_enable_bcm7211[] __initconst = { 0x18, 0x10, 0x14 };
+static const int reg_disable_bcm7211[] __initconst = { 0x28, 0x20, 0x24 };
+
static const int shortcuts[] = {
7, 9, 10, 18, 19, /* Bank 1 */
21, 22, 23, 24, 25, 30 /* Bank 2 */
@@ -87,6 +102,7 @@ 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 bcm7211_chained_handle_irq(struct irq_desc *desc);

static void armctrl_mask_irq(struct irq_data *d)
{
@@ -131,11 +147,14 @@ static const struct irq_domain_ops armctrl_ops = {

static int __init armctrl_of_init(struct device_node *node,
struct device_node *parent,
- bool is_2836)
+ enum armctrl_type type)
{
void __iomem *base;
int irq, b, i;

+ if (type > ARMCTRL_BCM7211)
+ return -EINVAL;
+
base = of_iomap(node, 0);
if (!base)
panic("%pOF: unable to map IC registers\n", node);
@@ -146,9 +165,19 @@ static int __init armctrl_of_init(struct device_node *node,
panic("%pOF: unable to create IRQ domain\n", node);

for (b = 0; b < NR_BANKS; b++) {
- intc.pending[b] = base + reg_pending[b];
- intc.enable[b] = base + reg_enable[b];
- intc.disable[b] = base + reg_disable[b];
+ if (type <= ARMCTRL_BCM2836) {
+ intc.pending[b] = base + reg_pending[b];
+ intc.enable[b] = base + reg_enable[b];
+ intc.disable[b] = base + reg_disable[b];
+ } else {
+ intc.pending[b] = base + reg_pending_bcm7211[b];
+ intc.enable[b] = base + reg_enable_bcm7211[b];
+ intc.disable[b] = base + reg_disable_bcm7211[b];
+ }
+
+ if (type == ARMCTRL_BCM7211)
+ armctrl_chip.flags |= IRQCHIP_MASK_ON_SUSPEND |
+ IRQCHIP_SKIP_SET_WAKE;

for (i = 0; i < bank_irqs[b]; i++) {
irq = irq_create_mapping(intc.domain, MAKE_HWIRQ(b, i));
@@ -159,14 +188,19 @@ static int __init armctrl_of_init(struct device_node *node,
}
}

- if (is_2836) {
+ if (type >= ARMCTRL_BCM2836) {
int parent_irq = irq_of_parse_and_map(node, 0);

if (!parent_irq) {
panic("%pOF: unable to get parent interrupt.\n",
node);
}
- irq_set_chained_handler(parent_irq, bcm2836_chained_handle_irq);
+ if (type == ARMCTRL_BCM2836)
+ irq_set_chained_handler(parent_irq,
+ bcm2836_chained_handle_irq);
+ else
+ irq_set_chained_handler(parent_irq,
+ bcm7211_chained_handle_irq);
} else {
set_handle_irq(bcm2835_handle_irq);
}
@@ -177,13 +211,19 @@ static int __init armctrl_of_init(struct device_node *node,
static int __init bcm2835_armctrl_of_init(struct device_node *node,
struct device_node *parent)
{
- return armctrl_of_init(node, parent, false);
+ return armctrl_of_init(node, parent, ARMCTRL_BCM2835);
}

static int __init bcm2836_armctrl_of_init(struct device_node *node,
struct device_node *parent)
{
- return armctrl_of_init(node, parent, true);
+ return armctrl_of_init(node, parent, ARMCTRL_BCM2836);
+}
+
+static int __init bcm7211_armctrl_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ return armctrl_of_init(node, parent, ARMCTRL_BCM7211);
}


@@ -205,9 +245,11 @@ static u32 armctrl_translate_shortcut(int bank, u32 stat)
return MAKE_HWIRQ(bank, shortcuts[ffs(stat >> SHORTCUT_SHIFT) - 1]);
}

-static u32 get_next_armctrl_hwirq(void)
+static u32 get_next_armctrl_hwirq(u32 valid_mask,
+ u32 bank1_mask,
+ u32 bank2_mask)
{
- u32 stat = readl_relaxed(intc.pending[0]) & BANK0_VALID_MASK;
+ u32 stat = readl_relaxed(intc.pending[0]) & valid_mask;

if (stat == 0)
return ~0;
@@ -217,9 +259,9 @@ static u32 get_next_armctrl_hwirq(void)
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)
+ else if (stat & bank1_mask)
return armctrl_translate_bank(1);
- else if (stat & BANK2_HWIRQ)
+ else if (stat & bank2_mask)
return armctrl_translate_bank(2);
else
BUG();
@@ -230,7 +272,9 @@ static void __exception_irq_entry bcm2835_handle_irq(
{
u32 hwirq;

- while ((hwirq = get_next_armctrl_hwirq()) != ~0)
+ while ((hwirq = get_next_armctrl_hwirq(BANK0_VALID_MASK,
+ BANK1_HWIRQ,
+ BANK2_HWIRQ)) != ~0)
handle_domain_irq(intc.domain, hwirq, regs);
}

@@ -238,7 +282,19 @@ static void bcm2836_chained_handle_irq(struct irq_desc *desc)
{
u32 hwirq;

- while ((hwirq = get_next_armctrl_hwirq()) != ~0)
+ while ((hwirq = get_next_armctrl_hwirq(BANK0_VALID_MASK,
+ BANK1_HWIRQ,
+ BANK2_HWIRQ)) != ~0)
+ generic_handle_irq(irq_linear_revmap(intc.domain, hwirq));
+}
+
+static void bcm7211_chained_handle_irq(struct irq_desc *desc)
+{
+ u32 hwirq;
+
+ while ((hwirq = get_next_armctrl_hwirq(BANK0_VALID_MASK_BCM7211,
+ BANK1_HWIRQ_BCM7211,
+ BANK2_HWIRQ_BCM7211)) != ~0)
generic_handle_irq(irq_linear_revmap(intc.domain, hwirq));
}

@@ -246,3 +302,5 @@ 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);
+IRQCHIP_DECLARE(bcm7211_armctrl_ic, "brcm,bcm7211-armctrl-ic",
+ bcm7211_armctrl_of_init);
--
2.17.1
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