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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/alpha/kernel/sys_ruffian.c
4 *
5 * Copyright (C) 1995 David A Rusling
6 * Copyright (C) 1996 Jay A Estabrook
7 * Copyright (C) 1998, 1999, 2000 Richard Henderson
8 *
9 * Code supporting the RUFFIAN.
10 */
11
12#include <linux/kernel.h>
13#include <linux/types.h>
14#include <linux/mm.h>
15#include <linux/sched.h>
16#include <linux/pci.h>
17#include <linux/ioport.h>
18#include <linux/timex.h>
19#include <linux/init.h>
20
21#include <asm/ptrace.h>
22#include <asm/dma.h>
23#include <asm/irq.h>
24#include <asm/mmu_context.h>
25#include <asm/io.h>
26#include <asm/core_cia.h>
27#include <asm/tlbflush.h>
28
29#include "proto.h"
30#include "irq_impl.h"
31#include "pci_impl.h"
32#include "machvec_impl.h"
33
34
35static void __init
36ruffian_init_irq(void)
37{
38 /* Invert 6&7 for i82371 */
39 *(vulp)PYXIS_INT_HILO = 0x000000c0UL; mb();
40 *(vulp)PYXIS_INT_CNFG = 0x00002064UL; mb(); /* all clear */
41
42 outb(0x11,0xA0);
43 outb(0x08,0xA1);
44 outb(0x02,0xA1);
45 outb(0x01,0xA1);
46 outb(0xFF,0xA1);
47
48 outb(0x11,0x20);
49 outb(0x00,0x21);
50 outb(0x04,0x21);
51 outb(0x01,0x21);
52 outb(0xFF,0x21);
53
54 /* Finish writing the 82C59A PIC Operation Control Words */
55 outb(0x20,0xA0);
56 outb(0x20,0x20);
57
58 init_i8259a_irqs();
59
60 /* Not interested in the bogus interrupts (0,3,6),
61 NMI (1), HALT (2), flash (5), or 21142 (8). */
62 init_pyxis_irqs(0x16f0000);
63
64 common_init_isa_dma();
65}
66
67#define RUFFIAN_LATCH DIV_ROUND_CLOSEST(PIT_TICK_RATE, HZ)
68
69static void __init
70ruffian_init_rtc(void)
71{
72 /* Ruffian does not have the RTC connected to the CPU timer
73 interrupt. Instead, it uses the PIT connected to IRQ 0. */
74
75 /* Setup interval timer. */
76 outb(0x34, 0x43); /* binary, mode 2, LSB/MSB, ch 0 */
77 outb(RUFFIAN_LATCH & 0xff, 0x40); /* LSB */
78 outb(RUFFIAN_LATCH >> 8, 0x40); /* MSB */
79
80 outb(0xb6, 0x43); /* pit counter 2: speaker */
81 outb(0x31, 0x42);
82 outb(0x13, 0x42);
83
84 if (request_irq(0, rtc_timer_interrupt, 0, "timer", NULL))
85 pr_err("Failed to request irq 0 (timer)\n");
86}
87
88static void
89ruffian_kill_arch (int mode)
90{
91 cia_kill_arch(mode);
92#if 0
93 /* This only causes re-entry to ARCSBIOS */
94 /* Perhaps this works for other PYXIS as well? */
95 *(vuip) PYXIS_RESET = 0x0000dead;
96 mb();
97#endif
98}
99
100/*
101 * Interrupt routing:
102 *
103 * Primary bus
104 * IdSel INTA INTB INTC INTD
105 * 21052 13 - - - -
106 * SIO 14 23 - - -
107 * 21143 15 44 - - -
108 * Slot 0 17 43 42 41 40
109 *
110 * Secondary bus
111 * IdSel INTA INTB INTC INTD
112 * Slot 0 8 (18) 19 18 17 16
113 * Slot 1 9 (19) 31 30 29 28
114 * Slot 2 10 (20) 27 26 25 24
115 * Slot 3 11 (21) 39 38 37 36
116 * Slot 4 12 (22) 35 34 33 32
117 * 53c875 13 (23) 20 - - -
118 *
119 */
120
121static int
122ruffian_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
123{
124 static char irq_tab[11][5] = {
125 /*INT INTA INTB INTC INTD */
126 {-1, -1, -1, -1, -1}, /* IdSel 13, 21052 */
127 {-1, -1, -1, -1, -1}, /* IdSel 14, SIO */
128 {44, 44, 44, 44, 44}, /* IdSel 15, 21143 */
129 {-1, -1, -1, -1, -1}, /* IdSel 16, none */
130 {43, 43, 42, 41, 40}, /* IdSel 17, 64-bit slot */
131 /* the next 6 are actually on PCI bus 1, across the bridge */
132 {19, 19, 18, 17, 16}, /* IdSel 8, slot 0 */
133 {31, 31, 30, 29, 28}, /* IdSel 9, slot 1 */
134 {27, 27, 26, 25, 24}, /* IdSel 10, slot 2 */
135 {39, 39, 38, 37, 36}, /* IdSel 11, slot 3 */
136 {35, 35, 34, 33, 32}, /* IdSel 12, slot 4 */
137 {20, 20, 20, 20, 20}, /* IdSel 13, 53c875 */
138 };
139 const long min_idsel = 13, max_idsel = 23, irqs_per_slot = 5;
140 return COMMON_TABLE_LOOKUP;
141}
142
143static u8
144ruffian_swizzle(struct pci_dev *dev, u8 *pinp)
145{
146 int slot, pin = *pinp;
147
148 if (dev->bus->number == 0) {
149 slot = PCI_SLOT(dev->devfn);
150 }
151 /* Check for the built-in bridge. */
152 else if (PCI_SLOT(dev->bus->self->devfn) == 13) {
153 slot = PCI_SLOT(dev->devfn) + 10;
154 }
155 else
156 {
157 /* Must be a card-based bridge. */
158 do {
159 if (PCI_SLOT(dev->bus->self->devfn) == 13) {
160 slot = PCI_SLOT(dev->devfn) + 10;
161 break;
162 }
163 pin = pci_swizzle_interrupt_pin(dev, pin);
164
165 /* Move up the chain of bridges. */
166 dev = dev->bus->self;
167 /* Slot of the next bridge. */
168 slot = PCI_SLOT(dev->devfn);
169 } while (dev->bus->self);
170 }
171 *pinp = pin;
172 return slot;
173}
174
175#ifdef BUILDING_FOR_MILO
176/*
177 * The DeskStation Ruffian motherboard firmware does not place
178 * the memory size in the PALimpure area. Therefore, we use
179 * the Bank Configuration Registers in PYXIS to obtain the size.
180 */
181static unsigned long __init
182ruffian_get_bank_size(unsigned long offset)
183{
184 unsigned long bank_addr, bank, ret = 0;
185
186 /* Valid offsets are: 0x800, 0x840 and 0x880
187 since Ruffian only uses three banks. */
188 bank_addr = (unsigned long)PYXIS_MCR + offset;
189 bank = *(vulp)bank_addr;
190
191 /* Check BANK_ENABLE */
192 if (bank & 0x01) {
193 static unsigned long size[] __initdata = {
194 0x40000000UL, /* 0x00, 1G */
195 0x20000000UL, /* 0x02, 512M */
196 0x10000000UL, /* 0x04, 256M */
197 0x08000000UL, /* 0x06, 128M */
198 0x04000000UL, /* 0x08, 64M */
199 0x02000000UL, /* 0x0a, 32M */
200 0x01000000UL, /* 0x0c, 16M */
201 0x00800000UL, /* 0x0e, 8M */
202 0x80000000UL, /* 0x10, 2G */
203 };
204
205 bank = (bank & 0x1e) >> 1;
206 if (bank < ARRAY_SIZE(size))
207 ret = size[bank];
208 }
209
210 return ret;
211}
212#endif /* BUILDING_FOR_MILO */
213
214/*
215 * The System Vector
216 */
217
218struct alpha_machine_vector ruffian_mv __initmv = {
219 .vector_name = "Ruffian",
220 DO_EV5_MMU,
221 DO_DEFAULT_RTC,
222 DO_PYXIS_IO,
223 .machine_check = cia_machine_check,
224 .max_isa_dma_address = ALPHA_RUFFIAN_MAX_ISA_DMA_ADDRESS,
225 .min_io_address = DEFAULT_IO_BASE,
226 .min_mem_address = DEFAULT_MEM_BASE,
227 .pci_dac_offset = PYXIS_DAC_OFFSET,
228
229 .nr_irqs = 48,
230 .device_interrupt = pyxis_device_interrupt,
231
232 .init_arch = pyxis_init_arch,
233 .init_irq = ruffian_init_irq,
234 .init_rtc = ruffian_init_rtc,
235 .init_pci = cia_init_pci,
236 .kill_arch = ruffian_kill_arch,
237 .pci_map_irq = ruffian_map_irq,
238 .pci_swizzle = ruffian_swizzle,
239};
240ALIAS_MV(ruffian)