1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/alpha/kernel/sys_jensen.c
4 *
5 * Copyright (C) 1995 Linus Torvalds
6 * Copyright (C) 1998, 1999 Richard Henderson
7 *
8 * Code supporting the Jensen.
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/mm.h>
14 #include <linux/sched.h>
15 #include <linux/pci.h>
16 #include <linux/init.h>
17
18 #include <asm/ptrace.h>
19
20 #define __EXTERN_INLINE inline
21 #include <asm/io.h>
22 #include <asm/jensen.h>
23 #undef __EXTERN_INLINE
24
25 #include <asm/dma.h>
26 #include <asm/irq.h>
27 #include <asm/mmu_context.h>
28 #include <asm/pgtable.h>
29 #include <asm/tlbflush.h>
30
31 #include "proto.h"
32 #include "irq_impl.h"
33 #include "pci_impl.h"
34 #include "machvec_impl.h"
35
36
37 /*
38 * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
39 * 0x9X0 for the local motherboard interrupts.
40 *
41 * Note especially that those local interrupts CANNOT be masked,
42 * which causes much of the pain below...
43 *
44 * 0x660 - NMI
45 *
46 * 0x800 - IRQ0 interval timer (not used, as we use the RTC timer)
47 * 0x810 - IRQ1 line printer (duh..)
48 * 0x860 - IRQ6 floppy disk
49 *
50 * 0x900 - COM1
51 * 0x920 - COM2
52 * 0x980 - keyboard
53 * 0x990 - mouse
54 *
55 * PCI-based systems are more sane: they don't have the local
56 * interrupts at all, and have only normal PCI interrupts from
57 * devices. Happily it's easy enough to do a sane mapping from the
58 * Jensen.
59 *
60 * Note that this means that we may have to do a hardware
61 * "local_op" to a different interrupt than we report to the rest of the
62 * world.
63 */
64
65 static void
jensen_local_enable(struct irq_data * d)66 jensen_local_enable(struct irq_data *d)
67 {
68 /* the parport is really hw IRQ 1, silly Jensen. */
69 if (d->irq == 7)
70 i8259a_enable_irq(d);
71 }
72
73 static void
jensen_local_disable(struct irq_data * d)74 jensen_local_disable(struct irq_data *d)
75 {
76 /* the parport is really hw IRQ 1, silly Jensen. */
77 if (d->irq == 7)
78 i8259a_disable_irq(d);
79 }
80
81 static void
jensen_local_mask_ack(struct irq_data * d)82 jensen_local_mask_ack(struct irq_data *d)
83 {
84 /* the parport is really hw IRQ 1, silly Jensen. */
85 if (d->irq == 7)
86 i8259a_mask_and_ack_irq(d);
87 }
88
89 static struct irq_chip jensen_local_irq_type = {
90 .name = "LOCAL",
91 .irq_unmask = jensen_local_enable,
92 .irq_mask = jensen_local_disable,
93 .irq_mask_ack = jensen_local_mask_ack,
94 };
95
96 static void
jensen_device_interrupt(unsigned long vector)97 jensen_device_interrupt(unsigned long vector)
98 {
99 int irq;
100
101 switch (vector) {
102 case 0x660:
103 printk("Whee.. NMI received. Probable hardware error\n");
104 printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
105 return;
106
107 /* local device interrupts: */
108 case 0x900: irq = 4; break; /* com1 -> irq 4 */
109 case 0x920: irq = 3; break; /* com2 -> irq 3 */
110 case 0x980: irq = 1; break; /* kbd -> irq 1 */
111 case 0x990: irq = 9; break; /* mouse -> irq 9 */
112
113 default:
114 if (vector > 0x900) {
115 printk("Unknown local interrupt %lx\n", vector);
116 return;
117 }
118
119 irq = (vector - 0x800) >> 4;
120 if (irq == 1)
121 irq = 7;
122 break;
123 }
124
125 /* If there is no handler yet... */
126 if (!irq_has_action(irq)) {
127 /* If it is a local interrupt that cannot be masked... */
128 if (vector >= 0x900)
129 {
130 /* Clear keyboard/mouse state */
131 inb(0x64);
132 inb(0x60);
133 /* Reset serial ports */
134 inb(0x3fa);
135 inb(0x2fa);
136 outb(0x0c, 0x3fc);
137 outb(0x0c, 0x2fc);
138 /* Clear NMI */
139 outb(0,0x61);
140 outb(0,0x461);
141 }
142 }
143
144 #if 0
145 /* A useful bit of code to find out if an interrupt is going wild. */
146 {
147 static unsigned int last_msg = 0, last_cc = 0;
148 static int last_irq = -1, count = 0;
149 unsigned int cc;
150
151 __asm __volatile("rpcc %0" : "=r"(cc));
152 ++count;
153 #define JENSEN_CYCLES_PER_SEC (150000000)
154 if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) ||
155 irq != last_irq) {
156 printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n",
157 irq, count, cc-last_cc, get_irq_regs()->pc);
158 count = 0;
159 last_msg = cc;
160 last_irq = irq;
161 }
162 last_cc = cc;
163 }
164 #endif
165
166 handle_irq(irq);
167 }
168
169 static void __init
jensen_init_irq(void)170 jensen_init_irq(void)
171 {
172 init_i8259a_irqs();
173
174 irq_set_chip_and_handler(1, &jensen_local_irq_type, handle_level_irq);
175 irq_set_chip_and_handler(4, &jensen_local_irq_type, handle_level_irq);
176 irq_set_chip_and_handler(3, &jensen_local_irq_type, handle_level_irq);
177 irq_set_chip_and_handler(7, &jensen_local_irq_type, handle_level_irq);
178 irq_set_chip_and_handler(9, &jensen_local_irq_type, handle_level_irq);
179
180 common_init_isa_dma();
181 }
182
183 static void __init
jensen_init_arch(void)184 jensen_init_arch(void)
185 {
186 struct pci_controller *hose;
187 #ifdef CONFIG_PCI
188 static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, };
189
190 isa_bridge = &fake_isa_bridge;
191 #endif
192
193 /* Create a hose so that we can report i/o base addresses to
194 userland. */
195
196 pci_isa_hose = hose = alloc_pci_controller();
197 hose->io_space = &ioport_resource;
198 hose->mem_space = &iomem_resource;
199 hose->index = 0;
200
201 hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
202 hose->dense_mem_base = 0;
203 hose->sparse_io_base = EISA_IO - IDENT_ADDR;
204 hose->dense_io_base = 0;
205
206 hose->sg_isa = hose->sg_pci = NULL;
207 __direct_map_base = 0;
208 __direct_map_size = 0xffffffff;
209 }
210
211 static void
jensen_machine_check(unsigned long vector,unsigned long la)212 jensen_machine_check(unsigned long vector, unsigned long la)
213 {
214 printk(KERN_CRIT "Machine check\n");
215 }
216
217 /*
218 * The System Vector
219 */
220
221 struct alpha_machine_vector jensen_mv __initmv = {
222 .vector_name = "Jensen",
223 DO_EV4_MMU,
224 IO_LITE(JENSEN,jensen),
225 .machine_check = jensen_machine_check,
226 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
227 .rtc_port = 0x170,
228
229 .nr_irqs = 16,
230 .device_interrupt = jensen_device_interrupt,
231
232 .init_arch = jensen_init_arch,
233 .init_irq = jensen_init_irq,
234 .init_rtc = common_init_rtc,
235 .init_pci = NULL,
236 .kill_arch = NULL,
237 };
238 ALIAS_MV(jensen)
239
