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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 | /* * Apple Peripheral System Controller (PSC) * * The PSC is used on the AV Macs to control IO functions not handled * by the VIAs (Ethernet, DSP, SCC). * * TO DO: * * Try to figure out what's going on in pIFR5 and pIFR6. There seem to be * persisant interrupt conditions in those registers and I have no idea what * they are. Granted it doesn't affect since we're not enabling any interrupts * on those levels at the moment, but it would be nice to know. I have a feeling * they aren't actually interrupt lines but data lines (to the DSP?) */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/irq.h> #include <asm/traps.h> #include <asm/macintosh.h> #include <asm/macints.h> #include <asm/mac_psc.h> #define DEBUG_PSC int psc_present; volatile __u8 *psc; /* * Debugging dump, used in various places to see what's going on. */ static void psc_debug_dump(void) { int i; if (!psc_present) return; for (i = 0x30 ; i < 0x70 ; i += 0x10) { printk("PSC #%d: IFR = 0x%02X IER = 0x%02X\n", i >> 4, (int) psc_read_byte(pIFRbase + i), (int) psc_read_byte(pIERbase + i)); } } /* * Try to kill all DMA channels on the PSC. Not sure how this his * supposed to work; this is code lifted from macmace.c and then * expanded to cover what I think are the other 7 channels. */ static __init void psc_dma_die_die_die(void) { int i; printk("Killing all PSC DMA channels..."); for (i = 0 ; i < 9 ; i++) { psc_write_word(PSC_CTL_BASE + (i << 4), 0x8800); psc_write_word(PSC_CTL_BASE + (i << 4), 0x1000); psc_write_word(PSC_CMD_BASE + (i << 5), 0x1100); psc_write_word(PSC_CMD_BASE + (i << 5) + 0x10, 0x1100); } printk("done!\n"); } /* * Initialize the PSC. For now this just involves shutting down all * interrupt sources using the IERs. */ void __init psc_init(void) { int i; if (macintosh_config->ident != MAC_MODEL_C660 && macintosh_config->ident != MAC_MODEL_Q840) { psc = NULL; psc_present = 0; return; } /* * The PSC is always at the same spot, but using psc * keeps things consistent with the psc_xxxx functions. */ psc = (void *) PSC_BASE; psc_present = 1; printk("PSC detected at %p\n", psc); psc_dma_die_die_die(); #ifdef DEBUG_PSC psc_debug_dump(); #endif /* * Mask and clear all possible interrupts */ for (i = 0x30 ; i < 0x70 ; i += 0x10) { psc_write_byte(pIERbase + i, 0x0F); psc_write_byte(pIFRbase + i, 0x0F); } } /* * PSC interrupt handler. It's a lot like the VIA interrupt handler. */ static void psc_irq(unsigned int irq, struct irq_desc *desc) { unsigned int offset = (unsigned int)irq_desc_get_handler_data(desc); int pIFR = pIFRbase + offset; int pIER = pIERbase + offset; int irq_num; unsigned char irq_bit, events; #ifdef DEBUG_IRQS printk("psc_irq: irq %u pIFR = 0x%02X pIER = 0x%02X\n", irq, (int) psc_read_byte(pIFR), (int) psc_read_byte(pIER)); #endif events = psc_read_byte(pIFR) & psc_read_byte(pIER) & 0xF; if (!events) return; irq_num = irq << 3; irq_bit = 1; do { if (events & irq_bit) { psc_write_byte(pIFR, irq_bit); generic_handle_irq(irq_num); } irq_num++; irq_bit <<= 1; } while (events >= irq_bit); } /* * Register the PSC interrupt dispatchers for autovector interrupts 3-6. */ void __init psc_register_interrupts(void) { irq_set_chained_handler(IRQ_AUTO_3, psc_irq); irq_set_handler_data(IRQ_AUTO_3, (void *)0x30); irq_set_chained_handler(IRQ_AUTO_4, psc_irq); irq_set_handler_data(IRQ_AUTO_4, (void *)0x40); irq_set_chained_handler(IRQ_AUTO_5, psc_irq); irq_set_handler_data(IRQ_AUTO_5, (void *)0x50); irq_set_chained_handler(IRQ_AUTO_6, psc_irq); irq_set_handler_data(IRQ_AUTO_6, (void *)0x60); } void psc_irq_enable(int irq) { int irq_src = IRQ_SRC(irq); int irq_idx = IRQ_IDX(irq); int pIER = pIERbase + (irq_src << 4); #ifdef DEBUG_IRQUSE printk("psc_irq_enable(%d)\n", irq); #endif psc_write_byte(pIER, (1 << irq_idx) | 0x80); } void psc_irq_disable(int irq) { int irq_src = IRQ_SRC(irq); int irq_idx = IRQ_IDX(irq); int pIER = pIERbase + (irq_src << 4); #ifdef DEBUG_IRQUSE printk("psc_irq_disable(%d)\n", irq); #endif psc_write_byte(pIER, 1 << irq_idx); } |