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/system.h> 16 #include <asm/io.h> 17 #include <asm/microdev.h> 18 19 #define NUM_EXTERNAL_IRQS 16 /* IRL0 .. IRL15 */ 20 21 static const struct { 22 unsigned char fpgaIrq; 23 unsigned char mapped; 24 const char *name; 25 } fpgaIrqTable[NUM_EXTERNAL_IRQS] = { 26 { 0, 0, "unused" }, /* IRQ #0 IRL=15 0x200 */ 27 { MICRODEV_FPGA_IRQ_KEYBOARD, 1, "keyboard" }, /* IRQ #1 IRL=14 0x220 */ 28 { MICRODEV_FPGA_IRQ_SERIAL1, 1, "Serial #1"}, /* IRQ #2 IRL=13 0x240 */ 29 { MICRODEV_FPGA_IRQ_ETHERNET, 1, "Ethernet" }, /* IRQ #3 IRL=12 0x260 */ 30 { MICRODEV_FPGA_IRQ_SERIAL2, 0, "Serial #2"}, /* IRQ #4 IRL=11 0x280 */ 31 { 0, 0, "unused" }, /* IRQ #5 IRL=10 0x2a0 */ 32 { 0, 0, "unused" }, /* IRQ #6 IRL=9 0x2c0 */ 33 { MICRODEV_FPGA_IRQ_USB_HC, 1, "USB" }, /* IRQ #7 IRL=8 0x2e0 */ 34 { MICRODEV_IRQ_PCI_INTA, 1, "PCI INTA" }, /* IRQ #8 IRL=7 0x300 */ 35 { MICRODEV_IRQ_PCI_INTB, 1, "PCI INTB" }, /* IRQ #9 IRL=6 0x320 */ 36 { MICRODEV_IRQ_PCI_INTC, 1, "PCI INTC" }, /* IRQ #10 IRL=5 0x340 */ 37 { MICRODEV_IRQ_PCI_INTD, 1, "PCI INTD" }, /* IRQ #11 IRL=4 0x360 */ 38 { MICRODEV_FPGA_IRQ_MOUSE, 1, "mouse" }, /* IRQ #12 IRL=3 0x380 */ 39 { MICRODEV_FPGA_IRQ_IDE2, 1, "IDE #2" }, /* IRQ #13 IRL=2 0x3a0 */ 40 { MICRODEV_FPGA_IRQ_IDE1, 1, "IDE #1" }, /* IRQ #14 IRL=1 0x3c0 */ 41 { 0, 0, "unused" }, /* IRQ #15 IRL=0 0x3e0 */ 42 }; 43 44 #if (MICRODEV_LINUX_IRQ_KEYBOARD != 1) 45 # error Inconsistancy in defining the IRQ# for Keyboard! 46 #endif 47 48 #if (MICRODEV_LINUX_IRQ_ETHERNET != 3) 49 # error Inconsistancy in defining the IRQ# for Ethernet! 50 #endif 51 52 #if (MICRODEV_LINUX_IRQ_USB_HC != 7) 53 # error Inconsistancy in defining the IRQ# for USB! 54 #endif 55 56 #if (MICRODEV_LINUX_IRQ_MOUSE != 12) 57 # error Inconsistancy in defining the IRQ# for PS/2 Mouse! 58 #endif 59 60 #if (MICRODEV_LINUX_IRQ_IDE2 != 13) 61 # error Inconsistancy in defining the IRQ# for secondary IDE! 62 #endif 63 64 #if (MICRODEV_LINUX_IRQ_IDE1 != 14) 65 # error Inconsistancy in defining the IRQ# for primary IDE! 66 #endif 67 68 static void enable_microdev_irq(unsigned int irq); 69 static void disable_microdev_irq(unsigned int irq); 70 71 /* shutdown is same as "disable" */ 72 #define shutdown_microdev_irq disable_microdev_irq 73 74 static void mask_and_ack_microdev(unsigned int); 75 static void end_microdev_irq(unsigned int irq); 76 77 static unsigned int startup_microdev_irq(unsigned int irq) 78 { 79 enable_microdev_irq(irq); 80 return 0; /* never anything pending */ 81 } 82 83 static struct hw_interrupt_type microdev_irq_type = { 84 .typename = "MicroDev-IRQ", 85 .startup = startup_microdev_irq, 86 .shutdown = shutdown_microdev_irq, 87 .enable = enable_microdev_irq, 88 .disable = disable_microdev_irq, 89 .ack = mask_and_ack_microdev, 90 .end = end_microdev_irq 91 }; 92 93 static void disable_microdev_irq(unsigned int irq) 94 { 95 unsigned int fpgaIrq; 96 97 if (irq >= NUM_EXTERNAL_IRQS) 98 return; 99 if (!fpgaIrqTable[irq].mapped) 100 return; 101 102 fpgaIrq = fpgaIrqTable[irq].fpgaIrq; 103 104 /* disable interrupts on the FPGA INTC register */ 105 ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG); 106 } 107 108 static void enable_microdev_irq(unsigned int irq) 109 { 110 unsigned long priorityReg, priorities, pri; 111 unsigned int fpgaIrq; 112 113 if (unlikely(irq >= NUM_EXTERNAL_IRQS)) 114 return; 115 if (unlikely(!fpgaIrqTable[irq].mapped)) 116 return; 117 118 pri = 15 - irq; 119 120 fpgaIrq = fpgaIrqTable[irq].fpgaIrq; 121 priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq); 122 123 /* set priority for the interrupt */ 124 priorities = ctrl_inl(priorityReg); 125 priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq); 126 priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri); 127 ctrl_outl(priorities, priorityReg); 128 129 /* enable interrupts on the FPGA INTC register */ 130 ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG); 131 } 132 133 /* This functions sets the desired irq handler to be a MicroDev type */ 134 static void __init make_microdev_irq(unsigned int irq) 135 { 136 disable_irq_nosync(irq); 137 irq_desc[irq].chip = µdev_irq_type; 138 disable_microdev_irq(irq); 139 } 140 141 static void mask_and_ack_microdev(unsigned int irq) 142 { 143 disable_microdev_irq(irq); 144 } 145 146 static void end_microdev_irq(unsigned int irq) 147 { 148 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) 149 enable_microdev_irq(irq); 150 } 151 152 extern void __init init_microdev_irq(void) 153 { 154 int i; 155 156 /* disable interrupts on the FPGA INTC register */ 157 ctrl_outl(~0ul, MICRODEV_FPGA_INTDSB_REG); 158 159 for (i = 0; i < NUM_EXTERNAL_IRQS; i++) 160 make_microdev_irq(i); 161 } 162 163 extern void microdev_print_fpga_intc_status(void) 164 { 165 volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG; 166 volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG; 167 volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0); 168 volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8); 169 volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16); 170 volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24); 171 volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG; 172 volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG; 173 174 printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n"); 175 printk("FPGA_INTENB = 0x%08x\n", *intenb); 176 printk("FPGA_INTDSB = 0x%08x\n", *intdsb); 177 printk("FPGA_INTSRC = 0x%08x\n", *intsrc); 178 printk("FPGA_INTREQ = 0x%08x\n", *intreq); 179 printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria); 180 printk("-------------------------------------------------------------------------------\n"); 181 } 182 183 184