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Linux/arch/sh/boards/mach-microdev/irq.c

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  1 /*
  2  * arch/sh/boards/superh/microdev/irq.c
  3  *
  4  * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com)
  5  *
  6  * SuperH SH4-202 MicroDev board support.
  7  *
  8  * May be copied or modified under the terms of the GNU General Public
  9  * License.  See linux/COPYING for more information.
 10  */
 11 
 12 #include <linux/init.h>
 13 #include <linux/irq.h>
 14 #include <linux/interrupt.h>
 15 #include <asm/io.h>
 16 #include <mach/microdev.h>
 17 
 18 #define NUM_EXTERNAL_IRQS 16    /* IRL0 .. IRL15 */
 19 
 20 static const struct {
 21         unsigned char fpgaIrq;
 22         unsigned char mapped;
 23         const char *name;
 24 } fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
 25         { 0,                            0,      "unused"   },           /* IRQ #0       IRL=15  0x200  */
 26         { MICRODEV_FPGA_IRQ_KEYBOARD,   1,      "keyboard" },           /* IRQ #1       IRL=14  0x220  */
 27         { MICRODEV_FPGA_IRQ_SERIAL1,    1,      "Serial #1"},           /* IRQ #2       IRL=13  0x240  */
 28         { MICRODEV_FPGA_IRQ_ETHERNET,   1,      "Ethernet" },           /* IRQ #3       IRL=12  0x260  */
 29         { MICRODEV_FPGA_IRQ_SERIAL2,    0,      "Serial #2"},           /* IRQ #4       IRL=11  0x280  */
 30         { 0,                            0,      "unused"   },           /* IRQ #5       IRL=10  0x2a0  */
 31         { 0,                            0,      "unused"   },           /* IRQ #6       IRL=9   0x2c0  */
 32         { MICRODEV_FPGA_IRQ_USB_HC,     1,      "USB"      },           /* IRQ #7       IRL=8   0x2e0  */
 33         { MICRODEV_IRQ_PCI_INTA,        1,      "PCI INTA" },           /* IRQ #8       IRL=7   0x300  */
 34         { MICRODEV_IRQ_PCI_INTB,        1,      "PCI INTB" },           /* IRQ #9       IRL=6   0x320  */
 35         { MICRODEV_IRQ_PCI_INTC,        1,      "PCI INTC" },           /* IRQ #10      IRL=5   0x340  */
 36         { MICRODEV_IRQ_PCI_INTD,        1,      "PCI INTD" },           /* IRQ #11      IRL=4   0x360  */
 37         { MICRODEV_FPGA_IRQ_MOUSE,      1,      "mouse"    },           /* IRQ #12      IRL=3   0x380  */
 38         { MICRODEV_FPGA_IRQ_IDE2,       1,      "IDE #2"   },           /* IRQ #13      IRL=2   0x3a0  */
 39         { MICRODEV_FPGA_IRQ_IDE1,       1,      "IDE #1"   },           /* IRQ #14      IRL=1   0x3c0  */
 40         { 0,                            0,      "unused"   },           /* IRQ #15      IRL=0   0x3e0  */
 41 };
 42 
 43 #if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
 44 #  error Inconsistancy in defining the IRQ# for Keyboard!
 45 #endif
 46 
 47 #if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
 48 #  error Inconsistancy in defining the IRQ# for Ethernet!
 49 #endif
 50 
 51 #if (MICRODEV_LINUX_IRQ_USB_HC != 7)
 52 #  error Inconsistancy in defining the IRQ# for USB!
 53 #endif
 54 
 55 #if (MICRODEV_LINUX_IRQ_MOUSE != 12)
 56 #  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
 57 #endif
 58 
 59 #if (MICRODEV_LINUX_IRQ_IDE2 != 13)
 60 #  error Inconsistancy in defining the IRQ# for secondary IDE!
 61 #endif
 62 
 63 #if (MICRODEV_LINUX_IRQ_IDE1 != 14)
 64 #  error Inconsistancy in defining the IRQ# for primary IDE!
 65 #endif
 66 
 67 static void disable_microdev_irq(struct irq_data *data)
 68 {
 69         unsigned int irq = data->irq;
 70         unsigned int fpgaIrq;
 71 
 72         if (irq >= NUM_EXTERNAL_IRQS)
 73                 return;
 74         if (!fpgaIrqTable[irq].mapped)
 75                 return;
 76 
 77         fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
 78 
 79         /* disable interrupts on the FPGA INTC register */
 80         __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
 81 }
 82 
 83 static void enable_microdev_irq(struct irq_data *data)
 84 {
 85         unsigned int irq = data->irq;
 86         unsigned long priorityReg, priorities, pri;
 87         unsigned int fpgaIrq;
 88 
 89         if (unlikely(irq >= NUM_EXTERNAL_IRQS))
 90                 return;
 91         if (unlikely(!fpgaIrqTable[irq].mapped))
 92                 return;
 93 
 94         pri = 15 - irq;
 95 
 96         fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
 97         priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
 98 
 99         /* set priority for the interrupt */
100         priorities = __raw_readl(priorityReg);
101         priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
102         priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
103         __raw_writel(priorities, priorityReg);
104 
105         /* enable interrupts on the FPGA INTC register */
106         __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
107 }
108 
109 static struct irq_chip microdev_irq_type = {
110         .name = "MicroDev-IRQ",
111         .irq_unmask = enable_microdev_irq,
112         .irq_mask = disable_microdev_irq,
113 };
114 
115 /* This function sets the desired irq handler to be a MicroDev type */
116 static void __init make_microdev_irq(unsigned int irq)
117 {
118         disable_irq_nosync(irq);
119         irq_set_chip_and_handler(irq, &microdev_irq_type, handle_level_irq);
120         disable_microdev_irq(irq_get_irq_data(irq));
121 }
122 
123 extern void __init init_microdev_irq(void)
124 {
125         int i;
126 
127         /* disable interrupts on the FPGA INTC register */
128         __raw_writel(~0ul, MICRODEV_FPGA_INTDSB_REG);
129 
130         for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
131                 make_microdev_irq(i);
132 }
133 
134 extern void microdev_print_fpga_intc_status(void)
135 {
136         volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
137         volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
138         volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
139         volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
140         volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
141         volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
142         volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
143         volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
144 
145         printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
146         printk("FPGA_INTENB = 0x%08x\n", *intenb);
147         printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
148         printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
149         printk("FPGA_INTREQ = 0x%08x\n", *intreq);
150         printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
151         printk("-------------------------------------------------------------------------------\n");
152 }
153 

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