Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Apple Peripheral System Controller (PSC) |
| 3 | * |
| 4 | * The PSC is used on the AV Macs to control IO functions not handled |
| 5 | * by the VIAs (Ethernet, DSP, SCC). |
| 6 | * |
| 7 | * TO DO: |
| 8 | * |
| 9 | * Try to figure out what's going on in pIFR5 and pIFR6. There seem to be |
| 10 | * persisant interrupt conditions in those registers and I have no idea what |
| 11 | * they are. Granted it doesn't affect since we're not enabling any interrupts |
| 12 | * on those levels at the moment, but it would be nice to know. I have a feeling |
| 13 | * they aren't actually interrupt lines but data lines (to the DSP?) |
| 14 | */ |
| 15 | |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/init.h> |
| 21 | |
| 22 | #include <asm/traps.h> |
| 23 | #include <asm/bootinfo.h> |
| 24 | #include <asm/macintosh.h> |
| 25 | #include <asm/macints.h> |
| 26 | #include <asm/mac_psc.h> |
| 27 | |
| 28 | #define DEBUG_PSC |
| 29 | |
| 30 | int psc_present; |
| 31 | volatile __u8 *psc; |
| 32 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 33 | irqreturn_t psc_irq(int, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | /* |
| 36 | * Debugging dump, used in various places to see what's going on. |
| 37 | */ |
| 38 | |
| 39 | void psc_debug_dump(void) |
| 40 | { |
| 41 | int i; |
| 42 | |
| 43 | if (!psc_present) return; |
| 44 | for (i = 0x30 ; i < 0x70 ; i += 0x10) { |
| 45 | printk("PSC #%d: IFR = 0x%02X IER = 0x%02X\n", |
| 46 | i >> 4, |
| 47 | (int) psc_read_byte(pIFRbase + i), |
| 48 | (int) psc_read_byte(pIERbase + i)); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | /* |
| 53 | * Try to kill all DMA channels on the PSC. Not sure how this his |
| 54 | * supposed to work; this is code lifted from macmace.c and then |
| 55 | * expanded to cover what I think are the other 7 channels. |
| 56 | */ |
| 57 | |
| 58 | void psc_dma_die_die_die(void) |
| 59 | { |
| 60 | int i; |
| 61 | |
| 62 | printk("Killing all PSC DMA channels..."); |
| 63 | for (i = 0 ; i < 9 ; i++) { |
| 64 | psc_write_word(PSC_CTL_BASE + (i << 4), 0x8800); |
| 65 | psc_write_word(PSC_CTL_BASE + (i << 4), 0x1000); |
| 66 | psc_write_word(PSC_CMD_BASE + (i << 5), 0x1100); |
| 67 | psc_write_word(PSC_CMD_BASE + (i << 5) + 0x10, 0x1100); |
| 68 | } |
| 69 | printk("done!\n"); |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * Initialize the PSC. For now this just involves shutting down all |
| 74 | * interrupt sources using the IERs. |
| 75 | */ |
| 76 | |
| 77 | void __init psc_init(void) |
| 78 | { |
| 79 | int i; |
| 80 | |
| 81 | if (macintosh_config->ident != MAC_MODEL_C660 |
| 82 | && macintosh_config->ident != MAC_MODEL_Q840) |
| 83 | { |
| 84 | psc = NULL; |
| 85 | psc_present = 0; |
| 86 | return; |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * The PSC is always at the same spot, but using psc |
| 91 | * keeps things consisant with the psc_xxxx functions. |
| 92 | */ |
| 93 | |
| 94 | psc = (void *) PSC_BASE; |
| 95 | psc_present = 1; |
| 96 | |
| 97 | printk("PSC detected at %p\n", psc); |
| 98 | |
| 99 | psc_dma_die_die_die(); |
| 100 | |
| 101 | #ifdef DEBUG_PSC |
| 102 | psc_debug_dump(); |
| 103 | #endif |
| 104 | /* |
| 105 | * Mask and clear all possible interrupts |
| 106 | */ |
| 107 | |
| 108 | for (i = 0x30 ; i < 0x70 ; i += 0x10) { |
| 109 | psc_write_byte(pIERbase + i, 0x0F); |
| 110 | psc_write_byte(pIFRbase + i, 0x0F); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * Register the PSC interrupt dispatchers for autovector interrupts 3-6. |
| 116 | */ |
| 117 | |
| 118 | void __init psc_register_interrupts(void) |
| 119 | { |
Roman Zippel | 9c5f4af | 2006-06-25 05:47:04 -0700 | [diff] [blame] | 120 | request_irq(IRQ_AUTO_3, psc_irq, 0, "psc3", (void *) 0x30); |
| 121 | request_irq(IRQ_AUTO_4, psc_irq, 0, "psc4", (void *) 0x40); |
| 122 | request_irq(IRQ_AUTO_5, psc_irq, 0, "psc5", (void *) 0x50); |
| 123 | request_irq(IRQ_AUTO_6, psc_irq, 0, "psc6", (void *) 0x60); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | /* |
| 127 | * PSC interrupt handler. It's a lot like the VIA interrupt handler. |
| 128 | */ |
| 129 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 130 | irqreturn_t psc_irq(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | { |
| 132 | int pIFR = pIFRbase + ((int) dev_id); |
| 133 | int pIER = pIERbase + ((int) dev_id); |
| 134 | int base_irq; |
| 135 | int irq_bit,i; |
| 136 | unsigned char events; |
| 137 | |
| 138 | base_irq = irq << 3; |
| 139 | |
| 140 | #ifdef DEBUG_IRQS |
| 141 | printk("psc_irq: irq %d pIFR = 0x%02X pIER = 0x%02X\n", |
| 142 | irq, (int) psc_read_byte(pIFR), (int) psc_read_byte(pIER)); |
| 143 | #endif |
| 144 | |
| 145 | events = psc_read_byte(pIFR) & psc_read_byte(pIER) & 0xF; |
| 146 | if (!events) |
| 147 | return IRQ_NONE; |
| 148 | |
| 149 | for (i = 0, irq_bit = 1 ; i < 4 ; i++, irq_bit <<= 1) { |
| 150 | if (events & irq_bit) { |
| 151 | psc_write_byte(pIER, irq_bit); |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 152 | m68k_handle_int(base_irq + i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | psc_write_byte(pIFR, irq_bit); |
| 154 | psc_write_byte(pIER, irq_bit | 0x80); |
| 155 | } |
| 156 | } |
| 157 | return IRQ_HANDLED; |
| 158 | } |
| 159 | |
| 160 | void psc_irq_enable(int irq) { |
| 161 | int irq_src = IRQ_SRC(irq); |
| 162 | int irq_idx = IRQ_IDX(irq); |
| 163 | int pIER = pIERbase + (irq_src << 4); |
| 164 | |
| 165 | #ifdef DEBUG_IRQUSE |
| 166 | printk("psc_irq_enable(%d)\n", irq); |
| 167 | #endif |
| 168 | psc_write_byte(pIER, (1 << irq_idx) | 0x80); |
| 169 | } |
| 170 | |
| 171 | void psc_irq_disable(int irq) { |
| 172 | int irq_src = IRQ_SRC(irq); |
| 173 | int irq_idx = IRQ_IDX(irq); |
| 174 | int pIER = pIERbase + (irq_src << 4); |
| 175 | |
| 176 | #ifdef DEBUG_IRQUSE |
| 177 | printk("psc_irq_disable(%d)\n", irq); |
| 178 | #endif |
| 179 | psc_write_byte(pIER, 1 << irq_idx); |
| 180 | } |
| 181 | |
| 182 | void psc_irq_clear(int irq) { |
| 183 | int irq_src = IRQ_SRC(irq); |
| 184 | int irq_idx = IRQ_IDX(irq); |
| 185 | int pIFR = pIERbase + (irq_src << 4); |
| 186 | |
| 187 | psc_write_byte(pIFR, 1 << irq_idx); |
| 188 | } |
| 189 | |
| 190 | int psc_irq_pending(int irq) |
| 191 | { |
| 192 | int irq_src = IRQ_SRC(irq); |
| 193 | int irq_idx = IRQ_IDX(irq); |
| 194 | int pIFR = pIERbase + (irq_src << 4); |
| 195 | |
| 196 | return psc_read_byte(pIFR) & (1 << irq_idx); |
| 197 | } |