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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * arch/sh64/kernel/irq_cayman.c * * SH-5 Cayman Interrupt Support * * This file handles the board specific parts of the Cayman interrupt system * * Copyright (C) 2002 Stuart Menefy */ #include <asm/irq.h> #include <asm/page.h> #include <asm/io.h> #include <linux/irq.h> #include <linux/interrupt.h> #include <linux/signal.h> #include <asm/cayman.h> unsigned long epld_virt; #define EPLD_BASE 0x04002000 #define EPLD_STATUS_BASE (epld_virt + 0x10) #define EPLD_MASK_BASE (epld_virt + 0x20) /* Note the SMSC SuperIO chip and SMSC LAN chip interrupts are all muxed onto the same SH-5 interrupt */ static irqreturn_t cayman_interrupt_smsc(int irq, void *dev_id) { printk(KERN_INFO "CAYMAN: spurious SMSC interrupt\n"); return IRQ_NONE; } static irqreturn_t cayman_interrupt_pci2(int irq, void *dev_id) { printk(KERN_INFO "CAYMAN: spurious PCI interrupt, IRQ %d\n", irq); return IRQ_NONE; } static struct irqaction cayman_action_smsc = { .name = "Cayman SMSC Mux", .handler = cayman_interrupt_smsc, .flags = IRQF_DISABLED, }; static struct irqaction cayman_action_pci2 = { .name = "Cayman PCI2 Mux", .handler = cayman_interrupt_pci2, .flags = IRQF_DISABLED, }; static void enable_cayman_irq(unsigned int irq) { unsigned long flags; unsigned long mask; unsigned int reg; unsigned char bit; irq -= START_EXT_IRQS; reg = EPLD_MASK_BASE + ((irq / 8) << 2); bit = 1<<(irq % 8); local_irq_save(flags); mask = ctrl_inl(reg); mask |= bit; ctrl_outl(mask, reg); local_irq_restore(flags); } void disable_cayman_irq(unsigned int irq) { unsigned long flags; unsigned long mask; unsigned int reg; unsigned char bit; irq -= START_EXT_IRQS; reg = EPLD_MASK_BASE + ((irq / 8) << 2); bit = 1<<(irq % 8); local_irq_save(flags); mask = ctrl_inl(reg); mask &= ~bit; ctrl_outl(mask, reg); local_irq_restore(flags); } static void ack_cayman_irq(unsigned int irq) { disable_cayman_irq(irq); } static void end_cayman_irq(unsigned int irq) { if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) enable_cayman_irq(irq); } static unsigned int startup_cayman_irq(unsigned int irq) { enable_cayman_irq(irq); return 0; /* never anything pending */ } static void shutdown_cayman_irq(unsigned int irq) { disable_cayman_irq(irq); } struct hw_interrupt_type cayman_irq_type = { .typename = "Cayman-IRQ", .startup = startup_cayman_irq, .shutdown = shutdown_cayman_irq, .enable = enable_cayman_irq, .disable = disable_cayman_irq, .ack = ack_cayman_irq, .end = end_cayman_irq, }; int cayman_irq_demux(int evt) { int irq = intc_evt_to_irq[evt]; if (irq == SMSC_IRQ) { unsigned long status; int i; status = ctrl_inl(EPLD_STATUS_BASE) & ctrl_inl(EPLD_MASK_BASE) & 0xff; if (status == 0) { irq = -1; } else { for (i=0; i<8; i++) { if (status & (1<<i)) break; } irq = START_EXT_IRQS + i; } } if (irq == PCI2_IRQ) { unsigned long status; int i; status = ctrl_inl(EPLD_STATUS_BASE + 3 * sizeof(u32)) & ctrl_inl(EPLD_MASK_BASE + 3 * sizeof(u32)) & 0xff; if (status == 0) { irq = -1; } else { for (i=0; i<8; i++) { if (status & (1<<i)) break; } irq = START_EXT_IRQS + (3 * 8) + i; } } return irq; } #if defined(CONFIG_PROC_FS) && defined(CONFIG_SYSCTL) int cayman_irq_describe(char* p, int irq) { if (irq < NR_INTC_IRQS) { return intc_irq_describe(p, irq); } else if (irq < NR_INTC_IRQS + 8) { return sprintf(p, "(SMSC %d)", irq - NR_INTC_IRQS); } else if ((irq >= NR_INTC_IRQS + 24) && (irq < NR_INTC_IRQS + 32)) { return sprintf(p, "(PCI2 %d)", irq - (NR_INTC_IRQS + 24)); } return 0; } #endif void init_cayman_irq(void) { int i; epld_virt = onchip_remap(EPLD_BASE, 1024, "EPLD"); if (!epld_virt) { printk(KERN_ERR "Cayman IRQ: Unable to remap EPLD\n"); return; } for (i=0; i<NR_EXT_IRQS; i++) { irq_desc[START_EXT_IRQS + i].chip = &cayman_irq_type; } /* Setup the SMSC interrupt */ setup_irq(SMSC_IRQ, &cayman_action_smsc); setup_irq(PCI2_IRQ, &cayman_action_pci2); } |