1/*
2 *	linux/arch/alpha/kernel/sys_takara.c
3 *
4 *	Copyright (C) 1995 David A Rusling
5 *	Copyright (C) 1996 Jay A Estabrook
6 *	Copyright (C) 1998, 1999 Richard Henderson
7 *
8 * Code supporting the TAKARA.
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#include <asm/dma.h>
20#include <asm/irq.h>
21#include <asm/mmu_context.h>
22#include <asm/io.h>
23#include <asm/pgtable.h>
24#include <asm/core_cia.h>
25#include <asm/tlbflush.h>
26
27#include "proto.h"
28#include "irq_impl.h"
29#include "pci_impl.h"
30#include "machvec_impl.h"
31#include "pc873xx.h"
32
33/* Note mask bit is true for DISABLED irqs.  */
34static unsigned long cached_irq_mask[2] = { -1, -1 };
35
36static inline void
37takara_update_irq_hw(unsigned long irq, unsigned long mask)
38{
39	int regaddr;
40
41	mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30));
42	regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c);
43	outl(mask & 0xffff0000UL, regaddr);
44}
45
46static inline void
47takara_enable_irq(struct irq_data *d)
48{
49	unsigned int irq = d->irq;
50	unsigned long mask;
51	mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
52	takara_update_irq_hw(irq, mask);
53}
54
55static void
56takara_disable_irq(struct irq_data *d)
57{
58	unsigned int irq = d->irq;
59	unsigned long mask;
60	mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
61	takara_update_irq_hw(irq, mask);
62}
63
64static struct irq_chip takara_irq_type = {
65	.name		= "TAKARA",
66	.irq_unmask	= takara_enable_irq,
67	.irq_mask	= takara_disable_irq,
68	.irq_mask_ack	= takara_disable_irq,
69};
70
71static void
72takara_device_interrupt(unsigned long vector)
73{
74	unsigned intstatus;
75
76	/*
77	 * The PALcode will have passed us vectors 0x800 or 0x810,
78	 * which are fairly arbitrary values and serve only to tell
79	 * us whether an interrupt has come in on IRQ0 or IRQ1. If
80	 * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's
81	 * probably ISA, but PCI interrupts can come through IRQ0
82	 * as well if the interrupt controller isn't in accelerated
83	 * mode.
84	 *
85	 * OTOH, the accelerator thing doesn't seem to be working
86	 * overly well, so what we'll do instead is try directly
87	 * examining the Master Interrupt Register to see if it's a
88	 * PCI interrupt, and if _not_ then we'll pass it on to the
89	 * ISA handler.
90	 */
91
92	intstatus = inw(0x500) & 15;
93	if (intstatus) {
94		/*
95		 * This is a PCI interrupt. Check each bit and
96		 * despatch an interrupt if it's set.
97		 */
98
99		if (intstatus & 8) handle_irq(16+3);
100		if (intstatus & 4) handle_irq(16+2);
101		if (intstatus & 2) handle_irq(16+1);
102		if (intstatus & 1) handle_irq(16+0);
103	} else {
104		isa_device_interrupt (vector);
105	}
106}
107
108static void
109takara_srm_device_interrupt(unsigned long vector)
110{
111	int irq = (vector - 0x800) >> 4;
112	handle_irq(irq);
113}
114
115static void __init
116takara_init_irq(void)
117{
118	long i;
119
120	init_i8259a_irqs();
121
122	if (alpha_using_srm) {
123		alpha_mv.device_interrupt = takara_srm_device_interrupt;
124	} else {
125		unsigned int ctlreg = inl(0x500);
126
127		/* Return to non-accelerated mode.  */
128		ctlreg &= ~0x8000;
129		outl(ctlreg, 0x500);
130
131		/* Enable the PCI interrupt register.  */
132		ctlreg = 0x05107c00;
133		outl(ctlreg, 0x500);
134	}
135
136	for (i = 16; i < 128; i += 16)
137		takara_update_irq_hw(i, -1);
138
139	for (i = 16; i < 128; ++i) {
140		irq_set_chip_and_handler(i, &takara_irq_type,
141					 handle_level_irq);
142		irq_set_status_flags(i, IRQ_LEVEL);
143	}
144
145	common_init_isa_dma();
146}
147
148
149/*
150 * The Takara has PCI devices 1, 2, and 3 configured to slots 20,
151 * 19, and 18 respectively, in the default configuration. They can
152 * also be jumpered to slots 8, 7, and 6 respectively, which is fun
153 * because the SIO ISA bridge can also be slot 7. However, the SIO
154 * doesn't explicitly generate PCI-type interrupts, so we can
155 * assign it whatever the hell IRQ we like and it doesn't matter.
156 */
157
158static int __init
159takara_map_irq_srm(const struct pci_dev *dev, u8 slot, u8 pin)
160{
161	static char irq_tab[15][5] __initdata = {
162		{ 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
163		{ 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
164		{ 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
165		{   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
166		{   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
167		{   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
168		/* These are behind the bridges.  */
169		{   12,   12,   13,   14,   15},   /* slot 12 == nothing */
170		{    8,    8,    9,   19,   11},   /* slot 13 == nothing */
171		{    4,    4,    5,    6,    7},   /* slot 14 == nothing */
172		{    0,    0,    1,    2,    3},   /* slot 15 == nothing */
173		{   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
174		{64+ 0, 64+0, 64+1, 64+2, 64+3},   /* slot 17= device 4 */
175		{48+ 0, 48+0, 48+1, 48+2, 48+3},   /* slot 18= device 3 */
176		{32+ 0, 32+0, 32+1, 32+2, 32+3},   /* slot 19= device 2 */
177		{16+ 0, 16+0, 16+1, 16+2, 16+3},   /* slot 20= device 1 */
178	};
179	const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
180        int irq = COMMON_TABLE_LOOKUP;
181	if (irq >= 0 && irq < 16) {
182		/* Guess that we are behind a bridge.  */
183		unsigned int busslot = PCI_SLOT(dev->bus->self->devfn);
184		irq += irq_tab[busslot-min_idsel][0];
185	}
186	return irq;
187}
188
189static int __init
190takara_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
191{
192	static char irq_tab[15][5] __initdata = {
193		{ 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
194		{ 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
195		{ 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
196		{   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
197		{   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
198		{   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
199		{   -1,   -1,   -1,   -1,   -1},   /* slot 12 == nothing */
200		{   -1,   -1,   -1,   -1,   -1},   /* slot 13 == nothing */
201		{   -1,   -1,   -1,   -1,   -1},   /* slot 14 == nothing */
202		{   -1,   -1,   -1,   -1,   -1},   /* slot 15 == nothing */
203		{   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
204		{   -1,   -1,   -1,   -1,   -1},   /* slot 17 == nothing */
205		{ 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot 18 == device 3 */
206		{ 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot 19 == device 2 */
207		{ 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot 20 == device 1 */
208	};
209	const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
210	return COMMON_TABLE_LOOKUP;
211}
212
213static u8 __init
214takara_swizzle(struct pci_dev *dev, u8 *pinp)
215{
216	int slot = PCI_SLOT(dev->devfn);
217	int pin = *pinp;
218	unsigned int ctlreg = inl(0x500);
219	unsigned int busslot;
220
221	if (!dev->bus->self)
222		return slot;
223
224	busslot = PCI_SLOT(dev->bus->self->devfn);
225	/* Check for built-in bridges.  */
226	if (dev->bus->number != 0
227	    && busslot > 16
228	    && ((1<<(36-busslot)) & ctlreg)) {
229		if (pin == 1)
230			pin += (20 - busslot);
231		else {
232			printk(KERN_WARNING "takara_swizzle: can only "
233			       "handle cards with INTA IRQ pin.\n");
234		}
235	} else {
236		/* Must be a card-based bridge.  */
237		printk(KERN_WARNING "takara_swizzle: cannot handle "
238		       "card-bridge behind builtin bridge yet.\n");
239	}
240
241	*pinp = pin;
242	return slot;
243}
244
245static void __init
246takara_init_pci(void)
247{
248	if (alpha_using_srm)
249		alpha_mv.pci_map_irq = takara_map_irq_srm;
250
251	cia_init_pci();
252
253	if (pc873xx_probe() == -1) {
254		printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
255	} else {
256		printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
257			pc873xx_get_model(), pc873xx_get_base());
258		pc873xx_enable_ide();
259	}
260}
261
262
263/*
264 * The System Vector
265 */
266
267struct alpha_machine_vector takara_mv __initmv = {
268	.vector_name		= "Takara",
269	DO_EV5_MMU,
270	DO_DEFAULT_RTC,
271	DO_CIA_IO,
272	.machine_check		= cia_machine_check,
273	.max_isa_dma_address	= ALPHA_MAX_ISA_DMA_ADDRESS,
274	.min_io_address		= DEFAULT_IO_BASE,
275	.min_mem_address	= CIA_DEFAULT_MEM_BASE,
276
277	.nr_irqs		= 128,
278	.device_interrupt	= takara_device_interrupt,
279
280	.init_arch		= cia_init_arch,
281	.init_irq		= takara_init_irq,
282	.init_rtc		= common_init_rtc,
283	.init_pci		= takara_init_pci,
284	.kill_arch		= cia_kill_arch,
285	.pci_map_irq		= takara_map_irq,
286	.pci_swizzle		= takara_swizzle,
287};
288ALIAS_MV(takara)
289