1// SPDX-License-Identifier: GPL-2.0
2/*
3 *	linux/arch/alpha/kernel/sys_noritake.c
4 *
5 *	Copyright (C) 1995 David A Rusling
6 *	Copyright (C) 1996 Jay A Estabrook
7 *	Copyright (C) 1998, 1999 Richard Henderson
8 *
9 * Code supporting the NORITAKE (AlphaServer 1000A),
10 * CORELLE (AlphaServer 800), and ALCOR Primo (AlphaStation 600A).
11 */
12
13#include <linux/kernel.h>
14#include <linux/types.h>
15#include <linux/mm.h>
16#include <linux/sched.h>
17#include <linux/pci.h>
18#include <linux/init.h>
19#include <linux/bitops.h>
20
21#include <asm/ptrace.h>
22#include <asm/mce.h>
23#include <asm/dma.h>
24#include <asm/irq.h>
25#include <asm/mmu_context.h>
26#include <asm/io.h>
27#include <asm/core_apecs.h>
28#include <asm/core_cia.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/* Note mask bit is true for ENABLED irqs.  */
37static int cached_irq_mask;
38
39static inline void
40noritake_update_irq_hw(int irq, int mask)
41{
42	int port = 0x54a;
43	if (irq >= 32) {
44	    mask >>= 16;
45	    port = 0x54c;
46	}
47	outw(mask, port);
48}
49
50static void
51noritake_enable_irq(struct irq_data *d)
52{
53	noritake_update_irq_hw(d->irq, cached_irq_mask |= 1 << (d->irq - 16));
54}
55
56static void
57noritake_disable_irq(struct irq_data *d)
58{
59	noritake_update_irq_hw(d->irq, cached_irq_mask &= ~(1 << (d->irq - 16)));
60}
61
62static struct irq_chip noritake_irq_type = {
63	.name		= "NORITAKE",
64	.irq_unmask	= noritake_enable_irq,
65	.irq_mask	= noritake_disable_irq,
66	.irq_mask_ack	= noritake_disable_irq,
67};
68
69static void
70noritake_device_interrupt(unsigned long vector)
71{
72	unsigned long pld;
73	unsigned int i;
74
75	/* Read the interrupt summary registers of NORITAKE */
76	pld = (((unsigned long) inw(0x54c) << 32)
77	       | ((unsigned long) inw(0x54a) << 16)
78	       | ((unsigned long) inb(0xa0) << 8)
79	       | inb(0x20));
80
81	/*
82	 * Now for every possible bit set, work through them and call
83	 * the appropriate interrupt handler.
84	 */
85	while (pld) {
86		i = ffz(~pld);
87		pld &= pld - 1; /* clear least bit set */
88		if (i < 16) {
89			isa_device_interrupt(vector);
90		} else {
91			handle_irq(i);
92		}
93	}
94}
95
96static void
97noritake_srm_device_interrupt(unsigned long vector)
98{
99	int irq;
100
101	irq = (vector - 0x800) >> 4;
102
103	/*
104	 * I really hate to do this, too, but the NORITAKE SRM console also
105	 * reports PCI vectors *lower* than I expected from the bit numbers
106	 * in the documentation.
107	 * But I really don't want to change the fixup code for allocation
108	 * of IRQs, nor the alpha_irq_mask maintenance stuff, both of which
109	 * look nice and clean now.
110	 * So, here's this additional grotty hack... :-(
111	 */
112	if (irq >= 16)
113		irq = irq + 1;
114
115	handle_irq(irq);
116}
117
118static void __init
119noritake_init_irq(void)
120{
121	long i;
122
123	if (alpha_using_srm)
124		alpha_mv.device_interrupt = noritake_srm_device_interrupt;
125
126	outw(0, 0x54a);
127	outw(0, 0x54c);
128
129	for (i = 16; i < 48; ++i) {
130		irq_set_chip_and_handler(i, &noritake_irq_type,
131					 handle_level_irq);
132		irq_set_status_flags(i, IRQ_LEVEL);
133	}
134
135	init_i8259a_irqs();
136	common_init_isa_dma();
137}
138
139
140/*
141 * PCI Fixup configuration.
142 *
143 * Summary @ 0x542, summary register #1:
144 * Bit      Meaning
145 * 0        All valid ints from summary regs 2 & 3
146 * 1        QLOGIC ISP1020A SCSI
147 * 2        Interrupt Line A from slot 0
148 * 3        Interrupt Line B from slot 0
149 * 4        Interrupt Line A from slot 1
150 * 5        Interrupt line B from slot 1
151 * 6        Interrupt Line A from slot 2
152 * 7        Interrupt Line B from slot 2
153 * 8        Interrupt Line A from slot 3
154 * 9        Interrupt Line B from slot 3
155 *10        Interrupt Line A from slot 4
156 *11        Interrupt Line B from slot 4
157 *12        Interrupt Line A from slot 5
158 *13        Interrupt Line B from slot 5
159 *14        Interrupt Line A from slot 6
160 *15        Interrupt Line B from slot 6
161 *
162 * Summary @ 0x544, summary register #2:
163 * Bit      Meaning
164 * 0        OR of all unmasked ints in SR #2
165 * 1        OR of secondary bus ints
166 * 2        Interrupt Line C from slot 0
167 * 3        Interrupt Line D from slot 0
168 * 4        Interrupt Line C from slot 1
169 * 5        Interrupt line D from slot 1
170 * 6        Interrupt Line C from slot 2
171 * 7        Interrupt Line D from slot 2
172 * 8        Interrupt Line C from slot 3
173 * 9        Interrupt Line D from slot 3
174 *10        Interrupt Line C from slot 4
175 *11        Interrupt Line D from slot 4
176 *12        Interrupt Line C from slot 5
177 *13        Interrupt Line D from slot 5
178 *14        Interrupt Line C from slot 6
179 *15        Interrupt Line D from slot 6
180 *
181 * The device to slot mapping looks like:
182 *
183 * Slot     Device
184 *  7       Intel PCI-EISA bridge chip
185 *  8       DEC PCI-PCI bridge chip
186 * 11       PCI on board slot 0
187 * 12       PCI on board slot 1
188 * 13       PCI on board slot 2
189 *
190 *
191 * This two layered interrupt approach means that we allocate IRQ 16 and
192 * above for PCI interrupts.  The IRQ relates to which bit the interrupt
193 * comes in on.  This makes interrupt processing much easier.
194 */
195
196static int
197noritake_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
198{
199	static char irq_tab[15][5] = {
200		/*INT    INTA   INTB   INTC   INTD */
201		/* note: IDSELs 16, 17, and 25 are CORELLE only */
202		{ 16+1,  16+1,  16+1,  16+1,  16+1},  /* IdSel 16,  QLOGIC */
203		{   -1,    -1,    -1,    -1,    -1},  /* IdSel 17, S3 Trio64 */
204		{   -1,    -1,    -1,    -1,    -1},  /* IdSel 18,  PCEB */
205		{   -1,    -1,    -1,    -1,    -1},  /* IdSel 19,  PPB  */
206		{   -1,    -1,    -1,    -1,    -1},  /* IdSel 20,  ???? */
207		{   -1,    -1,    -1,    -1,    -1},  /* IdSel 21,  ???? */
208		{ 16+2,  16+2,  16+3,  32+2,  32+3},  /* IdSel 22,  slot 0 */
209		{ 16+4,  16+4,  16+5,  32+4,  32+5},  /* IdSel 23,  slot 1 */
210		{ 16+6,  16+6,  16+7,  32+6,  32+7},  /* IdSel 24,  slot 2 */
211		{ 16+8,  16+8,  16+9,  32+8,  32+9},  /* IdSel 25,  slot 3 */
212		/* The following 5 are actually on PCI bus 1, which is
213		   across the built-in bridge of the NORITAKE only.  */
214		{ 16+1,  16+1,  16+1,  16+1,  16+1},  /* IdSel 16,  QLOGIC */
215		{ 16+8,  16+8,  16+9,  32+8,  32+9},  /* IdSel 17,  slot 3 */
216		{16+10, 16+10, 16+11, 32+10, 32+11},  /* IdSel 18,  slot 4 */
217		{16+12, 16+12, 16+13, 32+12, 32+13},  /* IdSel 19,  slot 5 */
218		{16+14, 16+14, 16+15, 32+14, 32+15},  /* IdSel 20,  slot 6 */
219	};
220	const long min_idsel = 5, max_idsel = 19, irqs_per_slot = 5;
221	return COMMON_TABLE_LOOKUP;
222}
223
224static u8
225noritake_swizzle(struct pci_dev *dev, u8 *pinp)
226{
227	int slot, pin = *pinp;
228
229	if (dev->bus->number == 0) {
230		slot = PCI_SLOT(dev->devfn);
231	}
232	/* Check for the built-in bridge */
233	else if (PCI_SLOT(dev->bus->self->devfn) == 8) {
234		slot = PCI_SLOT(dev->devfn) + 15; /* WAG! */
235	}
236	else
237	{
238		/* Must be a card-based bridge.  */
239		do {
240			if (PCI_SLOT(dev->bus->self->devfn) == 8) {
241				slot = PCI_SLOT(dev->devfn) + 15;
242				break;
243			}
244			pin = pci_swizzle_interrupt_pin(dev, pin);
245
246			/* Move up the chain of bridges.  */
247			dev = dev->bus->self;
248			/* Slot of the next bridge.  */
249			slot = PCI_SLOT(dev->devfn);
250		} while (dev->bus->self);
251	}
252	*pinp = pin;
253	return slot;
254}
255
256#if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
257static void
258noritake_apecs_machine_check(unsigned long vector, unsigned long la_ptr)
259{
260#define MCHK_NO_DEVSEL 0x205U
261#define MCHK_NO_TABT 0x204U
262
263        struct el_common *mchk_header;
264        unsigned int code;
265
266        mchk_header = (struct el_common *)la_ptr;
267
268        /* Clear the error before any reporting.  */
269        mb();
270        mb(); /* magic */
271        draina();
272        apecs_pci_clr_err();
273        wrmces(0x7);
274        mb();
275
276        code = mchk_header->code;
277        process_mcheck_info(vector, la_ptr, "NORITAKE APECS",
278                            (mcheck_expected(0)
279                             && (code == MCHK_NO_DEVSEL
280                                 || code == MCHK_NO_TABT)));
281}
282#endif
283
284
285/*
286 * The System Vectors
287 */
288
289#if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
290struct alpha_machine_vector noritake_mv __initmv = {
291	.vector_name		= "Noritake",
292	DO_EV4_MMU,
293	DO_DEFAULT_RTC,
294	DO_APECS_IO,
295	.machine_check		= noritake_apecs_machine_check,
296	.max_isa_dma_address	= ALPHA_MAX_ISA_DMA_ADDRESS,
297	.min_io_address		= EISA_DEFAULT_IO_BASE,
298	.min_mem_address	= APECS_AND_LCA_DEFAULT_MEM_BASE,
299
300	.nr_irqs		= 48,
301	.device_interrupt	= noritake_device_interrupt,
302
303	.init_arch		= apecs_init_arch,
304	.init_irq		= noritake_init_irq,
305	.init_rtc		= common_init_rtc,
306	.init_pci		= common_init_pci,
307	.pci_map_irq		= noritake_map_irq,
308	.pci_swizzle		= noritake_swizzle,
309};
310ALIAS_MV(noritake)
311#endif
312
313#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PRIMO)
314struct alpha_machine_vector noritake_primo_mv __initmv = {
315	.vector_name		= "Noritake-Primo",
316	DO_EV5_MMU,
317	DO_DEFAULT_RTC,
318	DO_CIA_IO,
319	.machine_check		= cia_machine_check,
320	.max_isa_dma_address	= ALPHA_MAX_ISA_DMA_ADDRESS,
321	.min_io_address		= EISA_DEFAULT_IO_BASE,
322	.min_mem_address	= CIA_DEFAULT_MEM_BASE,
323
324	.nr_irqs		= 48,
325	.device_interrupt	= noritake_device_interrupt,
326
327	.init_arch		= cia_init_arch,
328	.init_irq		= noritake_init_irq,
329	.init_rtc		= common_init_rtc,
330	.init_pci		= cia_init_pci,
331	.kill_arch		= cia_kill_arch,
332	.pci_map_irq		= noritake_map_irq,
333	.pci_swizzle		= noritake_swizzle,
334};
335ALIAS_MV(noritake_primo)
336#endif
337