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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/m68k/mac/psc.c
2 * Apple Peripheral System Controller (PSC)
4 * The PSC is used on the AV Macs to control IO functions not handled
5 * by the VIAs (Ethernet, DSP, SCC).
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?)
16 #include <linux/types.h>
17 #include <linux/kernel.h>
19 #include <linux/delay.h>
20 #include <linux/init.h>
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>
33 irqreturn_t
psc_irq(int, void *, struct pt_regs
*);
36 * Debugging dump, used in various places to see what's going on.
39 void psc_debug_dump(void)
43 if (!psc_present
) return;
44 for (i
= 0x30 ; i
< 0x70 ; i
+= 0x10) {
45 printk("PSC #%d: IFR = 0x%02X IER = 0x%02X\n",
47 (int) psc_read_byte(pIFRbase
+ i
),
48 (int) psc_read_byte(pIERbase
+ i
));
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.
58 void psc_dma_die_die_die(void)
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);
73 * Initialize the PSC. For now this just involves shutting down all
74 * interrupt sources using the IERs.
77 void __init
psc_init(void)
81 if (macintosh_config
->ident
!= MAC_MODEL_C660
82 && macintosh_config
->ident
!= MAC_MODEL_Q840
)
90 * The PSC is always at the same spot, but using psc
91 * keeps things consisant with the psc_xxxx functions.
94 psc
= (void *) PSC_BASE
;
97 printk("PSC detected at %p\n", psc
);
99 psc_dma_die_die_die();
105 * Mask and clear all possible interrupts
108 for (i
= 0x30 ; i
< 0x70 ; i
+= 0x10) {
109 psc_write_byte(pIERbase
+ i
, 0x0F);
110 psc_write_byte(pIFRbase
+ i
, 0x0F);
115 * Register the PSC interrupt dispatchers for autovector interrupts 3-6.
118 void __init
psc_register_interrupts(void)
120 cpu_request_irq(3, psc_irq
, IRQ_FLG_LOCK
, "psc3", (void *) 0x30);
121 cpu_request_irq(4, psc_irq
, IRQ_FLG_LOCK
, "psc4", (void *) 0x40);
122 cpu_request_irq(5, psc_irq
, IRQ_FLG_LOCK
, "psc5", (void *) 0x50);
123 cpu_request_irq(6, psc_irq
, IRQ_FLG_LOCK
, "psc6", (void *) 0x60);
127 * PSC interrupt handler. It's a lot like the VIA interrupt handler.
130 irqreturn_t
psc_irq(int irq
, void *dev_id
, struct pt_regs
*regs
)
132 int pIFR
= pIFRbase
+ ((int) dev_id
);
133 int pIER
= pIERbase
+ ((int) dev_id
);
136 unsigned char events
;
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
));
145 events
= psc_read_byte(pIFR
) & psc_read_byte(pIER
) & 0xF;
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
);
152 mac_do_irq_list(base_irq
+ i
, regs
);
153 psc_write_byte(pIFR
, irq_bit
);
154 psc_write_byte(pIER
, irq_bit
| 0x80);
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);
166 printk("psc_irq_enable(%d)\n", irq
);
168 psc_write_byte(pIER
, (1 << irq_idx
) | 0x80);
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);
177 printk("psc_irq_disable(%d)\n", irq
);
179 psc_write_byte(pIER
, 1 << irq_idx
);
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);
187 psc_write_byte(pIFR
, 1 << irq_idx
);
190 int psc_irq_pending(int irq
)
192 int irq_src
= IRQ_SRC(irq
);
193 int irq_idx
= IRQ_IDX(irq
);
194 int pIFR
= pIERbase
+ (irq_src
<< 4);
196 return psc_read_byte(pIFR
) & (1 << irq_idx
);