ARM: SPEAr3xx: shirq: simplify and move the shared irq multiplexor to DT

SPEAr3xx architecture includes shared/multiplexed irqs for certain set
of devices. The multiplexor provides a single interrupt to parent
interrupt controller (VIC) on behalf of a group of devices.

There can be multiple groups available on SPEAr3xx variants but not
exceeding 4. The number of devices in a group can differ, further they
may share same set of status/mask registers spanning across different
bit masks. Also in some cases the group may not have enable or other
registers. This makes software little complex.

Present implementation was non-DT and had few complex data structures to
decipher banks, number of irqs supported, mask and registers involved.

This patch simplifies the overall design and convert it in to DT.  It
also removes all registration from individual SoC files and bring them
in to common shirq.c.

Also updated the corresponding documentation for DT binding of shirq.

Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

1 files changed, 16 insertions, 23 deletions

diff --git a/arch/arm/plat-spear/include/plat/shirq.h b/arch/arm/plat-spear/include/plat/shirq.h
index 88a7fbd..c51b355 100644
--- a/arch/arm/plat-spear/include/plat/shirq.h
+++ b/arch/arm/plat-spear/include/plat/shirq.h
@@ -18,24 +18,8 @@
 #include <linux/types.h>
 
 /*
- * struct shirq_dev_config: shared irq device configuration
- *
- * virq: virtual irq number of device
- * enb_mask: enable mask of device
- * status_mask: status mask of device
- * clear_mask: clear mask of device
- */
-struct shirq_dev_config {
-	u32 virq;
-	u32 enb_mask;
-	u32 status_mask;
-	u32 clear_mask;
-};
-
-/*
  * struct shirq_regs: shared irq register configuration
  *
- * base: base address of shared irq register
  * enb_reg: enable register offset
  * reset_to_enb: val 1 indicates, we need to clear bit for enabling interrupt
  * status_reg: status register offset
@@ -44,11 +28,9 @@ struct shirq_dev_config {
  * reset_to_clear: val 1 indicates, we need to clear bit for clearing interrupt
  */
 struct shirq_regs {
-	void __iomem *base;
 	u32 enb_reg;
 	u32 reset_to_enb;
 	u32 status_reg;
-	u32 status_reg_mask;
 	u32 clear_reg;
 	u32 reset_to_clear;
 };
@@ -57,17 +39,28 @@ struct shirq_regs {
  * struct spear_shirq: shared irq structure
  *
  * irq: hardware irq number
- * dev_config: array of device config structures which are using "irq" line
- * dev_count: size of dev_config array
+ * irq_base: base irq in linux domain
+ * irq_nr: no. of shared interrupts in a particular block
+ * irq_bit_off: starting bit offset in the status register
+ * invalid_irq: irq group is currently disabled
+ * base: base address of shared irq register
  * regs: register configuration for shared irq block
  */
 struct spear_shirq {
 	u32 irq;
-	struct shirq_dev_config *dev_config;
-	u32 dev_count;
+	u32 irq_base;
+	u32 irq_nr;
+	u32 irq_bit_off;
+	int invalid_irq;
+	void __iomem *base;
 	struct shirq_regs regs;
 };
 
-int spear_shirq_register(struct spear_shirq *shirq);
+int __init spear300_shirq_of_init(struct device_node *np,
+		struct device_node *parent);
+int __init spear310_shirq_of_init(struct device_node *np,
+		struct device_node *parent);
+int __init spear320_shirq_of_init(struct device_node *np,
+		struct device_node *parent);
 
 #endif /* __PLAT_SHIRQ_H */