ARM: imx: add a legacy irqdomain for 3ds_debugboard

Call irq_alloc_descs to get the irq_base for 3ds_debugboard, and add
a legacy irqdomain using the irq_base, so that the mapping between
3ds_debugboard hardware irq and Linux irq number can be dynamically
handled by irqdomain.  As the result, the use of MXC_BOARD_IRQ_START
can be completely removed from 3ds_debugboard.c.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>

1 files changed, 25 insertions, 17 deletions

diff --git a/arch/arm/plat-mxc/3ds_debugboard.c b/arch/arm/plat-mxc/3ds_debugboard.c
index 3b48a08c165a..5c10ad05df74 100644
--- a/arch/arm/plat-mxc/3ds_debugboard.c
+++ b/arch/arm/plat-mxc/3ds_debugboard.c
@@ -12,9 +12,11 @@
 
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/irqdomain.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
+#include <linux/module.h>
 #include <linux/smsc911x.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/fixed.h>
@@ -48,26 +50,22 @@
 /* CPU ID and Personality ID */
 #define MCU_BOARD_ID_REG        0x68
 
-#define MXC_IRQ_TO_EXPIO(irq)   ((irq) - MXC_BOARD_IRQ_START)
-
-#define MXC_EXP_IO_BASE         (MXC_BOARD_IRQ_START)
 #define MXC_MAX_EXP_IO_LINES    16
 
 /* interrupts like external uart , external ethernet etc*/
-#define EXPIO_INT_ENET          (MXC_BOARD_IRQ_START + 0)
-#define EXPIO_INT_XUART_A       (MXC_BOARD_IRQ_START + 1)
-#define EXPIO_INT_XUART_B       (MXC_BOARD_IRQ_START + 2)
-#define EXPIO_INT_BUTTON_A      (MXC_BOARD_IRQ_START + 3)
-#define EXPIO_INT_BUTTON_B      (MXC_BOARD_IRQ_START + 4)
+#define EXPIO_INT_ENET          0
+#define EXPIO_INT_XUART_A       1
+#define EXPIO_INT_XUART_B       2
+#define EXPIO_INT_BUTTON_A      3
+#define EXPIO_INT_BUTTON_B      4
 
 static void __iomem *brd_io;
+static struct irq_domain *domain;
 
 static struct resource smsc911x_resources[] = {
         {
                 .flags = IORESOURCE_MEM,
         } , {
-                .start = EXPIO_INT_ENET,
-                .end = EXPIO_INT_ENET,
                 .flags = IORESOURCE_IRQ,
         },
 };
@@ -99,11 +97,11 @@ static void mxc_expio_irq_handler(u32 irq, struct irq_desc *desc)
         imr_val = __raw_readw(brd_io + INTR_MASK_REG);
         int_valid = __raw_readw(brd_io + INTR_STATUS_REG) & ~imr_val;
 
-        expio_irq = MXC_BOARD_IRQ_START;
+        expio_irq = 0;
         for (; int_valid != 0; int_valid >>= 1, expio_irq++) {
                 if ((int_valid & 1) == 0)
                         continue;
-                generic_handle_irq(expio_irq);
+                generic_handle_irq(irq_find_mapping(domain, expio_irq));
         }
 
         desc->irq_data.chip->irq_ack(&desc->irq_data);
@@ -117,7 +115,7 @@ static void mxc_expio_irq_handler(u32 irq, struct irq_desc *desc)
 static void expio_mask_irq(struct irq_data *d)
 {
         u16 reg;
-        u32 expio = MXC_IRQ_TO_EXPIO(d->irq);
+        u32 expio = d->hwirq;
 
         reg = __raw_readw(brd_io + INTR_MASK_REG);
         reg |= (1 << expio);
@@ -126,7 +124,7 @@ static void expio_mask_irq(struct irq_data *d)
 
 static void expio_ack_irq(struct irq_data *d)
 {
-        u32 expio = MXC_IRQ_TO_EXPIO(d->irq);
+        u32 expio = d->hwirq;
 
         __raw_writew(1 << expio, brd_io + INTR_RESET_REG);
         __raw_writew(0, brd_io + INTR_RESET_REG);
@@ -136,7 +134,7 @@ static void expio_ack_irq(struct irq_data *d)
 static void expio_unmask_irq(struct irq_data *d)
 {
         u16 reg;
-        u32 expio = MXC_IRQ_TO_EXPIO(d->irq);
+        u32 expio = d->hwirq;
 
         reg = __raw_readw(brd_io + INTR_MASK_REG);
         reg &= ~(1 << expio);
@@ -157,6 +155,7 @@ static struct regulator_consumer_supply dummy_supplies[] = {
 int __init mxc_expio_init(u32 base, u32 intr_gpio)
 {
         u32 p_irq = gpio_to_irq(intr_gpio);
+        int irq_base;
         int i;
 
         brd_io = ioremap(BOARD_IO_ADDR(base), SZ_4K);
@@ -186,8 +185,15 @@ int __init mxc_expio_init(u32 base, u32 intr_gpio)
         __raw_writew(0xFFFF, brd_io + INTR_RESET_REG);
         __raw_writew(0, brd_io + INTR_RESET_REG);
         __raw_writew(0x1F, brd_io + INTR_MASK_REG);
-        for (i = MXC_EXP_IO_BASE;
-             i < (MXC_EXP_IO_BASE + MXC_MAX_EXP_IO_LINES); i++) {
+
+        irq_base = irq_alloc_descs(-1, 0, MXC_MAX_EXP_IO_LINES, numa_node_id());
+        WARN_ON(irq_base < 0);
+
+        domain = irq_domain_add_legacy(NULL, MXC_MAX_EXP_IO_LINES, irq_base, 0,
+                                       &irq_domain_simple_ops, NULL);
+        WARN_ON(!domain);
+
+        for (i = irq_base; i < irq_base + MXC_MAX_EXP_IO_LINES; i++) {
                 irq_set_chip_and_handler(i, &expio_irq_chip, handle_level_irq);
                 set_irq_flags(i, IRQF_VALID);
         }
@@ -199,6 +205,8 @@ int __init mxc_expio_init(u32 base, u32 intr_gpio)
 
         smsc911x_resources[0].start = LAN9217_BASE_ADDR(base);
         smsc911x_resources[0].end = LAN9217_BASE_ADDR(base) + 0x100 - 1;
+        smsc911x_resources[1].start = irq_find_mapping(domain, EXPIO_INT_ENET);
+        smsc911x_resources[1].end = irq_find_mapping(domain, EXPIO_INT_ENET);
         platform_device_register(&smsc_lan9217_device);
 
         return 0;