/* linux/arch/arm/mach-s3c2443/irq.c * * Copyright (c) 2007 Simtec Electronics * Ben Dooks * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 __init 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(base, &s3c_irq_level_chip); irq_set_handler(base, handle_level_irq); irq_set_chained_handler(base, demux); for (irqno = start; irqno <= end; irqno++) { irq_set_chip(irqno, chip); irq_set_handler(irqno, handle_level_irq); set_irq_flags(irqno, IRQF_VALID); } return 0; } static int __init s3c2443_irq_add(struct sys_device *sysdev) { 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 sysdev_driver s3c2443_irq_driver = { .add = s3c2443_irq_add, }; static int __init s3c2443_irq_init(void) { return sysdev_driver_register(&s3c2443_sysclass, &s3c2443_irq_driver); } arch_initcall(s3c2443_irq_init);