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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 | /* * $Id: setup.c,v 1.4 2003/08/03 03:05:10 lethal Exp $ * * Setup and IRQ handling code for the HD64465 companion chip. * by Greg Banks <gbanks@pocketpenguins.com> * Copyright (c) 2000 PocketPenguins Inc * * Derived from setup_hd64461.c which bore the message: * Copyright (C) 2000 YAEGASHI Takeshi */ #include <linux/config.h> #include <linux/sched.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/param.h> #include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/irq.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/hd64465/hd64465.h> static void disable_hd64465_irq(unsigned int irq) { unsigned long flags; unsigned short nimr; unsigned short mask = 1 << (irq - HD64465_IRQ_BASE); pr_debug("disable_hd64465_irq(%d): mask=%x\n", irq, mask); local_irq_save(flags); nimr = inw(HD64465_REG_NIMR); nimr |= mask; outw(nimr, HD64465_REG_NIMR); local_irq_restore(flags); } static void enable_hd64465_irq(unsigned int irq) { unsigned long flags; unsigned short nimr; unsigned short mask = 1 << (irq - HD64465_IRQ_BASE); pr_debug("enable_hd64465_irq(%d): mask=%x\n", irq, mask); local_irq_save(flags); nimr = inw(HD64465_REG_NIMR); nimr &= ~mask; outw(nimr, HD64465_REG_NIMR); local_irq_restore(flags); } static void mask_and_ack_hd64465(unsigned int irq) { disable_hd64465_irq(irq); } static void end_hd64465_irq(unsigned int irq) { if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) enable_hd64465_irq(irq); } static unsigned int startup_hd64465_irq(unsigned int irq) { enable_hd64465_irq(irq); return 0; } static void shutdown_hd64465_irq(unsigned int irq) { disable_hd64465_irq(irq); } static struct hw_interrupt_type hd64465_irq_type = { .typename = "HD64465-IRQ", .startup = startup_hd64465_irq, .shutdown = shutdown_hd64465_irq, .enable = enable_hd64465_irq, .disable = disable_hd64465_irq, .ack = mask_and_ack_hd64465, .end = end_hd64465_irq, }; static irqreturn_t hd64465_interrupt(int irq, void *dev_id, struct pt_regs *regs) { printk(KERN_INFO "HD64465: spurious interrupt, nirr: 0x%x nimr: 0x%x\n", inw(HD64465_REG_NIRR), inw(HD64465_REG_NIMR)); return IRQ_NONE; } /*====================================================*/ /* * Support for a secondary IRQ demux step. This is necessary * because the HD64465 presents a very thin interface to the * PCMCIA bus; a lot of features (such as remapping interrupts) * normally done in hardware by other PCMCIA host bridges is * instead done in software. */ static struct { int (*func)(int, void *); void *dev; } hd64465_demux[HD64465_IRQ_NUM]; void hd64465_register_irq_demux(int irq, int (*demux)(int irq, void *dev), void *dev) { hd64465_demux[irq - HD64465_IRQ_BASE].func = demux; hd64465_demux[irq - HD64465_IRQ_BASE].dev = dev; } EXPORT_SYMBOL(hd64465_register_irq_demux); void hd64465_unregister_irq_demux(int irq) { hd64465_demux[irq - HD64465_IRQ_BASE].func = 0; } EXPORT_SYMBOL(hd64465_unregister_irq_demux); int hd64465_irq_demux(int irq) { if (irq == CONFIG_HD64465_IRQ) { unsigned short i, bit; unsigned short nirr = inw(HD64465_REG_NIRR); unsigned short nimr = inw(HD64465_REG_NIMR); pr_debug("hd64465_irq_demux, nirr=%04x, nimr=%04x\n", nirr, nimr); nirr &= ~nimr; for (bit = 1, i = 0 ; i < HD64465_IRQ_NUM ; bit <<= 1, i++) if (nirr & bit) break; if (i < HD64465_IRQ_NUM) { irq = HD64465_IRQ_BASE + i; if (hd64465_demux[i].func != 0) irq = hd64465_demux[i].func(irq, hd64465_demux[i].dev); } } return irq; } static struct irqaction irq0 = { hd64465_interrupt, SA_INTERRUPT, 0, "HD64465", NULL, NULL}; static int __init setup_hd64465(void) { int i; unsigned short rev; unsigned short smscr; if (!MACH_HD64465) return 0; printk(KERN_INFO "HD64465 configured at 0x%x on irq %d(mapped into %d to %d)\n", CONFIG_HD64465_IOBASE, CONFIG_HD64465_IRQ, HD64465_IRQ_BASE, HD64465_IRQ_BASE+HD64465_IRQ_NUM-1); if (inw(HD64465_REG_SDID) != HD64465_SDID) { printk(KERN_ERR "HD64465 device ID not found, check base address\n"); } rev = inw(HD64465_REG_SRR); printk(KERN_INFO "HD64465 hardware revision %d.%d\n", (rev >> 8) & 0xff, rev & 0xff); outw(0xffff, HD64465_REG_NIMR); /* mask all interrupts */ for (i = 0; i < HD64465_IRQ_NUM ; i++) { irq_desc[HD64465_IRQ_BASE + i].handler = &hd64465_irq_type; } setup_irq(CONFIG_HD64465_IRQ, &irq0); #ifdef CONFIG_SERIAL /* wake up the UART from STANDBY at this point */ smscr = inw(HD64465_REG_SMSCR); outw(smscr & (~HD64465_SMSCR_UARTST), HD64465_REG_SMSCR); /* remap IO ports for first ISA serial port to HD64465 UART */ hd64465_port_map(0x3f8, 8, CONFIG_HD64465_IOBASE + 0x8000, 1); #endif return 0; } module_init(setup_hd64465); |