ARM: S3C24XX: move s3c2443 irq code to irq.c

Prequisite for further optimizations.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 243 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c24xx/irq.c b/arch/arm/plat-s3c24xx/irq.c
index 21b2c9d..6f24e23 100644
--- a/arch/arm/plat-s3c24xx/irq.c
+++ b/arch/arm/plat-s3c24xx/irq.c
@@ -730,3 +730,246 @@ void __init s3c2416_init_irq(void)
 }
 
 #endif
+
+#ifdef CONFIG_CPU_S3C2443
+#define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1)
+
+static inline void s3c2443_irq_demux(unsigned int irq, unsigned int len)
+{
+	unsigned int subsrc, submsk;
+	unsigned int end;
+
+	/* read the current pending interrupts, and the mask
+	 * for what it is available */
+
+	subsrc = __raw_readl(S3C2410_SUBSRCPND);
+	submsk = __raw_readl(S3C2410_INTSUBMSK);
+
+	subsrc  &= ~submsk;
+	subsrc >>= (irq - S3C2410_IRQSUB(0));
+	subsrc  &= (1 << len)-1;
+
+	end = len + irq;
+
+	for (; irq < end && subsrc; irq++) {
+		if (subsrc & 1)
+			generic_handle_irq(irq);
+
+		subsrc >>= 1;
+	}
+}
+
+/* WDT/AC97 sub interrupts */
+
+static void s3c2443_irq_demux_wdtac97(unsigned int irq, struct irq_desc *desc)
+{
+	s3c2443_irq_demux(IRQ_S3C2443_WDT, 4);
+}
+
+#define INTMSK_WDTAC97	(1UL << (IRQ_WDT - IRQ_EINT0))
+#define SUBMSK_WDTAC97	INTMSK(IRQ_S3C2443_WDT, IRQ_S3C2443_AC97)
+
+static void s3c2443_irq_wdtac97_mask(struct irq_data *data)
+{
+	s3c_irqsub_mask(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
+}
+
+static void s3c2443_irq_wdtac97_unmask(struct irq_data *data)
+{
+	s3c_irqsub_unmask(data->irq, INTMSK_WDTAC97);
+}
+
+static void s3c2443_irq_wdtac97_ack(struct irq_data *data)
+{
+	s3c_irqsub_maskack(data->irq, INTMSK_WDTAC97, SUBMSK_WDTAC97);
+}
+
+static struct irq_chip s3c2443_irq_wdtac97 = {
+	.irq_mask	= s3c2443_irq_wdtac97_mask,
+	.irq_unmask	= s3c2443_irq_wdtac97_unmask,
+	.irq_ack	= s3c2443_irq_wdtac97_ack,
+};
+
+/* LCD sub interrupts */
+
+static void s3c2443_irq_demux_lcd(unsigned int irq, struct irq_desc *desc)
+{
+	s3c2443_irq_demux(IRQ_S3C2443_LCD1, 4);
+}
+
+#define INTMSK_LCD	(1UL << (IRQ_LCD - IRQ_EINT0))
+#define SUBMSK_LCD	INTMSK(IRQ_S3C2443_LCD1, IRQ_S3C2443_LCD4)
+
+static void s3c2443_irq_lcd_mask(struct irq_data *data)
+{
+	s3c_irqsub_mask(data->irq, INTMSK_LCD, SUBMSK_LCD);
+}
+
+static void s3c2443_irq_lcd_unmask(struct irq_data *data)
+{
+	s3c_irqsub_unmask(data->irq, INTMSK_LCD);
+}
+
+static void s3c2443_irq_lcd_ack(struct irq_data *data)
+{
+	s3c_irqsub_maskack(data->irq, INTMSK_LCD, SUBMSK_LCD);
+}
+
+static struct irq_chip s3c2443_irq_lcd = {
+	.irq_mask	= s3c2443_irq_lcd_mask,
+	.irq_unmask	= s3c2443_irq_lcd_unmask,
+	.irq_ack	= s3c2443_irq_lcd_ack,
+};
+
+/* DMA sub interrupts */
+
+static void s3c2443_irq_demux_dma(unsigned int irq, struct irq_desc *desc)
+{
+	s3c2443_irq_demux(IRQ_S3C2443_DMA0, 6);
+}
+
+#define INTMSK_DMA	(1UL << (IRQ_S3C2443_DMA - IRQ_EINT0))
+#define SUBMSK_DMA	INTMSK(IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5)
+
+static void s3c2443_irq_dma_mask(struct irq_data *data)
+{
+	s3c_irqsub_mask(data->irq, INTMSK_DMA, SUBMSK_DMA);
+}
+
+static void s3c2443_irq_dma_unmask(struct irq_data *data)
+{
+	s3c_irqsub_unmask(data->irq, INTMSK_DMA);
+}
+
+static void s3c2443_irq_dma_ack(struct irq_data *data)
+{
+	s3c_irqsub_maskack(data->irq, INTMSK_DMA, SUBMSK_DMA);
+}
+
+static struct irq_chip s3c2443_irq_dma = {
+	.irq_mask	= s3c2443_irq_dma_mask,
+	.irq_unmask	= s3c2443_irq_dma_unmask,
+	.irq_ack	= s3c2443_irq_dma_ack,
+};
+
+/* UART3 sub interrupts */
+
+static void s3c2443_irq_demux_uart3(unsigned int irq, struct irq_desc *desc)
+{
+	s3c2443_irq_demux(IRQ_S3C2443_RX3, 3);
+}
+
+#define INTMSK_UART3	(1UL << (IRQ_S3C2443_UART3 - IRQ_EINT0))
+#define SUBMSK_UART3	(0x7 << (IRQ_S3C2443_RX3 - S3C2410_IRQSUB(0)))
+
+static void s3c2443_irq_uart3_mask(struct irq_data *data)
+{
+	s3c_irqsub_mask(data->irq, INTMSK_UART3, SUBMSK_UART3);
+}
+
+static void s3c2443_irq_uart3_unmask(struct irq_data *data)
+{
+	s3c_irqsub_unmask(data->irq, INTMSK_UART3);
+}
+
+static void s3c2443_irq_uart3_ack(struct irq_data *data)
+{
+	s3c_irqsub_maskack(data->irq, INTMSK_UART3, SUBMSK_UART3);
+}
+
+static struct irq_chip s3c2443_irq_uart3 = {
+	.irq_mask	= s3c2443_irq_uart3_mask,
+	.irq_unmask	= s3c2443_irq_uart3_unmask,
+	.irq_ack	= s3c2443_irq_uart3_ack,
+};
+
+/* CAM sub interrupts */
+
+static void s3c2443_irq_demux_cam(unsigned int irq, struct irq_desc *desc)
+{
+	s3c2443_irq_demux(IRQ_S3C2440_CAM_C, 4);
+}
+
+#define INTMSK_CAM	(1UL << (IRQ_CAM - IRQ_EINT0))
+#define SUBMSK_CAM	INTMSK(IRQ_S3C2440_CAM_C, IRQ_S3C2440_CAM_P)
+
+static void s3c2443_irq_cam_mask(struct irq_data *data)
+{
+	s3c_irqsub_mask(data->irq, INTMSK_CAM, SUBMSK_CAM);
+}
+
+static void s3c2443_irq_cam_unmask(struct irq_data *data)
+{
+	s3c_irqsub_unmask(data->irq, INTMSK_CAM);
+}
+
+static void s3c2443_irq_cam_ack(struct irq_data *data)
+{
+	s3c_irqsub_maskack(data->irq, INTMSK_CAM, SUBMSK_CAM);
+}
+
+static struct irq_chip s3c2443_irq_cam = {
+	.irq_mask	= s3c2443_irq_cam_mask,
+	.irq_unmask	= s3c2443_irq_cam_unmask,
+	.irq_ack	= s3c2443_irq_cam_ack,
+};
+
+/* IRQ initialisation code */
+
+static int s3c2443_add_sub(unsigned int base,
+				   void (*demux)(unsigned int,
+						 struct irq_desc *),
+				   struct irq_chip *chip,
+				   unsigned int start, unsigned int end)
+{
+	unsigned int irqno;
+
+	irq_set_chip_and_handler(base, &s3c_irq_level_chip, handle_level_irq);
+	irq_set_chained_handler(base, demux);
+
+	for (irqno = start; irqno <= end; irqno++) {
+		irq_set_chip_and_handler(irqno, chip, handle_level_irq);
+		set_irq_flags(irqno, IRQF_VALID);
+	}
+
+	return 0;
+}
+
+static int s3c2443_irq_add(struct device *dev,
+				  struct subsys_interface *sif)
+{
+	printk("S3C2443: IRQ Support\n");
+
+	s3c2443_add_sub(IRQ_CAM, s3c2443_irq_demux_cam, &s3c2443_irq_cam,
+			IRQ_S3C2440_CAM_C, IRQ_S3C2440_CAM_P);
+
+	s3c2443_add_sub(IRQ_LCD, s3c2443_irq_demux_lcd, &s3c2443_irq_lcd,
+			IRQ_S3C2443_LCD1, IRQ_S3C2443_LCD4);
+
+	s3c2443_add_sub(IRQ_S3C2443_DMA, s3c2443_irq_demux_dma,
+			&s3c2443_irq_dma, IRQ_S3C2443_DMA0, IRQ_S3C2443_DMA5);
+
+	s3c2443_add_sub(IRQ_S3C2443_UART3, s3c2443_irq_demux_uart3,
+			&s3c2443_irq_uart3,
+			IRQ_S3C2443_RX3, IRQ_S3C2443_ERR3);
+
+	s3c2443_add_sub(IRQ_WDT, s3c2443_irq_demux_wdtac97,
+			&s3c2443_irq_wdtac97,
+			IRQ_S3C2443_WDT, IRQ_S3C2443_AC97);
+
+	return 0;
+}
+
+static struct subsys_interface s3c2443_irq_interface = {
+	.name		= "s3c2443_irq",
+	.subsys		= &s3c2443_subsys,
+	.add_dev	= s3c2443_irq_add,
+};
+
+static int __init s3c2443_irq_init(void)
+{
+	return subsys_interface_register(&s3c2443_irq_interface);
+}
+
+arch_initcall(s3c2443_irq_init);
+#endif