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> |
Geert Uytterhoeven | ddc7fd2 | 2011-07-13 21:48:30 +0200 | [diff] [blame] | 21 | #include <linux/irq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | #include <asm/traps.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Geert Uytterhoeven | a77cdaa | 2015-09-29 10:24:05 +0200 | [diff] [blame^] | 32 | EXPORT_SYMBOL_GPL(psc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | /* |
| 35 | * Debugging dump, used in various places to see what's going on. |
| 36 | */ |
| 37 | |
Adrian Bunk | 8dfbdf4 | 2008-07-17 21:16:25 +0200 | [diff] [blame] | 38 | static void psc_debug_dump(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | { |
| 40 | int i; |
| 41 | |
| 42 | if (!psc_present) return; |
| 43 | for (i = 0x30 ; i < 0x70 ; i += 0x10) { |
| 44 | printk("PSC #%d: IFR = 0x%02X IER = 0x%02X\n", |
| 45 | i >> 4, |
| 46 | (int) psc_read_byte(pIFRbase + i), |
| 47 | (int) psc_read_byte(pIERbase + i)); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | /* |
| 52 | * Try to kill all DMA channels on the PSC. Not sure how this his |
| 53 | * supposed to work; this is code lifted from macmace.c and then |
| 54 | * expanded to cover what I think are the other 7 channels. |
| 55 | */ |
| 56 | |
Geert Uytterhoeven | a4df02a | 2013-06-25 21:15:24 +0200 | [diff] [blame] | 57 | static __init void psc_dma_die_die_die(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | { |
| 59 | int i; |
| 60 | |
| 61 | printk("Killing all PSC DMA channels..."); |
| 62 | for (i = 0 ; i < 9 ; i++) { |
| 63 | psc_write_word(PSC_CTL_BASE + (i << 4), 0x8800); |
| 64 | psc_write_word(PSC_CTL_BASE + (i << 4), 0x1000); |
| 65 | psc_write_word(PSC_CMD_BASE + (i << 5), 0x1100); |
| 66 | psc_write_word(PSC_CMD_BASE + (i << 5) + 0x10, 0x1100); |
| 67 | } |
| 68 | printk("done!\n"); |
| 69 | } |
| 70 | |
| 71 | /* |
| 72 | * Initialize the PSC. For now this just involves shutting down all |
| 73 | * interrupt sources using the IERs. |
| 74 | */ |
| 75 | |
| 76 | void __init psc_init(void) |
| 77 | { |
| 78 | int i; |
| 79 | |
| 80 | if (macintosh_config->ident != MAC_MODEL_C660 |
| 81 | && macintosh_config->ident != MAC_MODEL_Q840) |
| 82 | { |
| 83 | psc = NULL; |
| 84 | psc_present = 0; |
| 85 | return; |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * The PSC is always at the same spot, but using psc |
Uwe Kleine-König | a34f0b3 | 2010-12-10 14:55:42 +0100 | [diff] [blame] | 90 | * keeps things consistent with the psc_xxxx functions. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | */ |
| 92 | |
| 93 | psc = (void *) PSC_BASE; |
| 94 | psc_present = 1; |
| 95 | |
| 96 | printk("PSC detected at %p\n", psc); |
| 97 | |
| 98 | psc_dma_die_die_die(); |
| 99 | |
| 100 | #ifdef DEBUG_PSC |
| 101 | psc_debug_dump(); |
| 102 | #endif |
| 103 | /* |
| 104 | * Mask and clear all possible interrupts |
| 105 | */ |
| 106 | |
| 107 | for (i = 0x30 ; i < 0x70 ; i += 0x10) { |
| 108 | psc_write_byte(pIERbase + i, 0x0F); |
| 109 | psc_write_byte(pIFRbase + i, 0x0F); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | * PSC interrupt handler. It's a lot like the VIA interrupt handler. |
| 115 | */ |
| 116 | |
Thomas Gleixner | bd0b9ac | 2015-09-14 10:42:37 +0200 | [diff] [blame] | 117 | static void psc_irq(struct irq_desc *desc) |
Geert Uytterhoeven | 9145db5 | 2011-08-10 12:48:29 +0200 | [diff] [blame] | 118 | { |
| 119 | unsigned int offset = (unsigned int)irq_desc_get_handler_data(desc); |
Thomas Gleixner | 625b86a | 2015-07-31 21:56:10 +0200 | [diff] [blame] | 120 | unsigned int irq = irq_desc_get_irq(desc); |
Geert Uytterhoeven | 9145db5 | 2011-08-10 12:48:29 +0200 | [diff] [blame] | 121 | int pIFR = pIFRbase + offset; |
| 122 | int pIER = pIERbase + offset; |
| 123 | int irq_num; |
| 124 | unsigned char irq_bit, events; |
| 125 | |
| 126 | #ifdef DEBUG_IRQS |
| 127 | printk("psc_irq: irq %u pIFR = 0x%02X pIER = 0x%02X\n", |
| 128 | irq, (int) psc_read_byte(pIFR), (int) psc_read_byte(pIER)); |
| 129 | #endif |
| 130 | |
| 131 | events = psc_read_byte(pIFR) & psc_read_byte(pIER) & 0xF; |
| 132 | if (!events) |
| 133 | return; |
| 134 | |
| 135 | irq_num = irq << 3; |
| 136 | irq_bit = 1; |
| 137 | do { |
| 138 | if (events & irq_bit) { |
| 139 | psc_write_byte(pIFR, irq_bit); |
| 140 | generic_handle_irq(irq_num); |
| 141 | } |
| 142 | irq_num++; |
| 143 | irq_bit <<= 1; |
| 144 | } while (events >= irq_bit); |
| 145 | } |
Geert Uytterhoeven | 9145db5 | 2011-08-10 12:48:29 +0200 | [diff] [blame] | 146 | |
| 147 | /* |
| 148 | * Register the PSC interrupt dispatchers for autovector interrupts 3-6. |
| 149 | */ |
| 150 | |
| 151 | void __init psc_register_interrupts(void) |
| 152 | { |
Thomas Gleixner | 09c5cb9 | 2015-06-21 21:00:30 +0200 | [diff] [blame] | 153 | irq_set_chained_handler_and_data(IRQ_AUTO_3, psc_irq, (void *)0x30); |
| 154 | irq_set_chained_handler_and_data(IRQ_AUTO_4, psc_irq, (void *)0x40); |
| 155 | irq_set_chained_handler_and_data(IRQ_AUTO_5, psc_irq, (void *)0x50); |
| 156 | irq_set_chained_handler_and_data(IRQ_AUTO_6, psc_irq, (void *)0x60); |
Geert Uytterhoeven | 9145db5 | 2011-08-10 12:48:29 +0200 | [diff] [blame] | 157 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | void psc_irq_enable(int irq) { |
| 160 | int irq_src = IRQ_SRC(irq); |
| 161 | int irq_idx = IRQ_IDX(irq); |
| 162 | int pIER = pIERbase + (irq_src << 4); |
| 163 | |
| 164 | #ifdef DEBUG_IRQUSE |
| 165 | printk("psc_irq_enable(%d)\n", irq); |
| 166 | #endif |
| 167 | psc_write_byte(pIER, (1 << irq_idx) | 0x80); |
| 168 | } |
| 169 | |
| 170 | void psc_irq_disable(int irq) { |
| 171 | int irq_src = IRQ_SRC(irq); |
| 172 | int irq_idx = IRQ_IDX(irq); |
| 173 | int pIER = pIERbase + (irq_src << 4); |
| 174 | |
| 175 | #ifdef DEBUG_IRQUSE |
| 176 | printk("psc_irq_disable(%d)\n", irq); |
| 177 | #endif |
| 178 | psc_write_byte(pIER, 1 << irq_idx); |
| 179 | } |