1/* $OpenBSD: pci_kn300.c,v 1.8 2017/09/08 05:36:51 deraadt Exp $ */
2/* $NetBSD: pci_kn300.c,v 1.28 2005/12/11 12:16:17 christos Exp $ */
3
4/*
5 * Copyright (c) 1998 by Matthew Jacob
6 * NASA AMES Research Center.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice immediately at the beginning of the file, without modification,
14 *    this list of conditions, and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
25 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/param.h>
35#include <sys/time.h>
36#include <sys/systm.h>
37#include <sys/errno.h>
38#include <sys/malloc.h>
39#include <sys/device.h>
40#include <sys/syslog.h>
41
42#include <uvm/uvm_extern.h>
43
44#include <machine/autoconf.h>
45
46#include <dev/pci/pcireg.h>
47#include <dev/pci/pcivar.h>
48#include <dev/pci/ppbreg.h>
49
50#include <alpha/mcbus/mcbusvar.h>
51#include <alpha/mcbus/mcbusreg.h>
52#include <alpha/pci/mcpciareg.h>
53#include <alpha/pci/mcpciavar.h>
54#include <alpha/pci/pci_kn300.h>
55
56#include "sio.h"
57#if NSIO > 0 || NPCEB > 0
58#include <alpha/pci/siovar.h>
59#endif
60
61int	dec_kn300_intr_map(struct pci_attach_args *, pci_intr_handle_t *);
62
63const char *dec_kn300_intr_string(void *, pci_intr_handle_t);
64void	*dec_kn300_intr_establish(void *, pci_intr_handle_t,
65	    int, int (*func)(void *), void *, const char *);
66void	dec_kn300_intr_disestablish(void *, void *);
67
68#define	KN300_PCEB_IRQ	16
69#define	NPIN		4
70
71#define	NIRQ	(MAX_MC_BUS * MCPCIA_PER_MCBUS * MCPCIA_MAXSLOT * NPIN)
72static int savirqs[NIRQ];
73
74static struct alpha_shared_intr *kn300_pci_intr;
75
76static struct mcpcia_config *mcpcia_eisaccp = NULL;
77
78void	kn300_iointr (void *, unsigned long);
79void	kn300_enable_intr (struct mcpcia_config *, int);
80void	kn300_disable_intr (struct mcpcia_config *, int);
81
82void
83pci_kn300_pickintr(ccp, first)
84	struct mcpcia_config *ccp;
85	int first;
86{
87	pci_chipset_tag_t pc = &ccp->cc_pc;
88
89	if (first) {
90		int g;
91
92		kn300_pci_intr = alpha_shared_intr_alloc(NIRQ);
93		for (g = 0; g < NIRQ; g++) {
94			alpha_shared_intr_set_maxstrays(kn300_pci_intr, g, 25);
95			savirqs[g] = (char) -1;
96		}
97	}
98
99	pc->pc_intr_v = ccp;
100	pc->pc_intr_map = dec_kn300_intr_map;
101	pc->pc_intr_string = dec_kn300_intr_string;
102	pc->pc_intr_establish = dec_kn300_intr_establish;
103	pc->pc_intr_disestablish = dec_kn300_intr_disestablish;
104
105	/* Not supported on KN300. */
106	pc->pc_pciide_compat_intr_establish = NULL;
107
108	if (EISA_PRESENT(REGVAL(MCPCIA_PCI_REV(ccp)))) {
109		mcpcia_eisaccp = ccp;
110#if NSIO > 0 || NPCEB > 0
111		sio_intr_setup(pc, &ccp->cc_iot);
112		kn300_enable_intr(ccp, KN300_PCEB_IRQ);
113#endif
114	}
115}
116
117int
118dec_kn300_intr_map(pa, ihp)
119	struct pci_attach_args *pa;
120	pci_intr_handle_t *ihp;
121{
122	pcitag_t bustag = pa->pa_intrtag;
123	int buspin = pa->pa_intrpin;
124	pci_chipset_tag_t pc = pa->pa_pc;
125	struct mcpcia_config *ccp = (struct mcpcia_config *)pc->pc_intr_v;
126	int device;
127	int mcpcia_irq;
128
129	if (pa->pa_bridgetag) {
130		buspin = PPB_INTERRUPT_SWIZZLE(pa->pa_rawintrpin,
131		    pa->pa_device);
132		if (pa->pa_bridgeih[buspin - 1] != 0) {
133			*ihp = pa->pa_bridgeih[buspin - 1];
134			return 0;
135		}
136
137		return 1;
138	}
139
140	pci_decompose_tag(pc, bustag, NULL, &device, NULL);
141
142	/*
143	 * On MID 5 device 1 is the internal NCR 53c810.
144	 */
145	if (ccp->cc_mid == 5 && device == 1) {
146		mcpcia_irq = 16;
147	} else if (device >= 2 && device <= 5) {
148		mcpcia_irq = (device - 2) * 4 + buspin - 1;
149	} else {
150		printf("dec_kn300_intr_map: don't know how to setup %d/%d/%d\n",
151		    pa->pa_bus, pa->pa_device, pa->pa_function);
152		return 1;
153	}
154
155	/*
156	 * handle layout:
157	 *
158	 *	Determine kn300 IRQ (encoded in SCB vector):
159	 *	bits 0..1	buspin-1
160	 *	bits 2..4	PCI Slot (0..7- yes, some don't exist)
161	 *	bits 5..7	MID-4
162	 *	bits 8..10	7-GID
163	 *
164	 *	Software only:
165	 *	bits 11-15	MCPCIA IRQ
166	 */
167	*ihp = (pci_intr_handle_t)
168		(buspin - 1			    )	|
169		((device & 0x7)			<< 2)	|
170		((ccp->cc_mid - 4)		<< 5)	|
171		((7 - ccp->cc_gid)		<< 8)	|
172		(mcpcia_irq			<< 11);
173
174	return (0);
175}
176
177const char *
178dec_kn300_intr_string(ccv, ih)
179	void *ccv;
180	pci_intr_handle_t ih;
181{
182	static char irqstr[64];
183	int irq;
184
185	irq = ih & 0x3ff;
186	if (irq >= NIRQ)
187		panic("dec_kn300_intr_string: bogus kn300 IRQ 0x%x", irq);
188
189	snprintf(irqstr, sizeof irqstr, "kn300 irq %d", irq);
190
191	return (irqstr);
192}
193
194void *
195dec_kn300_intr_establish(ccv, ih, level, func, arg, name)
196        void *ccv, *arg;
197        pci_intr_handle_t ih;
198        int level;
199        int (*func) (void *);
200	const char *name;
201{
202	struct mcpcia_config *ccp = ccv;
203	void *cookie;
204	int irq;
205
206	irq = ih & 0x3ff;
207	if (irq >= NIRQ)
208		panic("dec_kn300_intr_establish: bogus kn300 IRQ 0x%x", irq);
209
210	cookie = alpha_shared_intr_establish(kn300_pci_intr, irq, IST_LEVEL,
211	    level, func, arg, "kn300 irq");
212
213	if (cookie != NULL &&
214	    alpha_shared_intr_firstactive(kn300_pci_intr, irq)) {
215		scb_set(MCPCIA_VEC_PCI + SCB_IDXTOVEC(irq),
216		    kn300_iointr, NULL);
217		alpha_shared_intr_set_private(kn300_pci_intr, irq, ccp);
218		savirqs[irq] = (ih >> 11) & 0x1f;
219		kn300_enable_intr(ccp, savirqs[irq]);
220		alpha_mb();
221	}
222	return (cookie);
223}
224
225void
226dec_kn300_intr_disestablish(ccv, cookie)
227	void *ccv, *cookie;
228{
229	panic("dec_kn300_intr_disestablish not implemented");
230}
231
232void
233kn300_iointr(arg, vec)
234	void *arg;
235	unsigned long vec;
236{
237	struct mcpcia_softc *mcp;
238	u_long irq;
239
240	irq = SCB_VECTOIDX(vec - MCPCIA_VEC_PCI);
241
242	if (alpha_shared_intr_dispatch(kn300_pci_intr, irq)) {
243		/*
244		 * Any claim of an interrupt at this level is a hint to
245		 * reset the stray interrupt count- elsewise a slow leak
246		 * over time will cause this level to be shutdown.
247		 */
248		alpha_shared_intr_reset_strays(kn300_pci_intr, irq);
249		return;
250	}
251
252	/*
253	 * If we haven't finished configuring yet, or there is no mcp
254	 * registered for this level yet, just return.
255	 */
256	mcp = alpha_shared_intr_get_private(kn300_pci_intr, irq);
257	if (mcp == NULL || mcp->mcpcia_cc == NULL)
258		return;
259
260	/*
261	 * We're getting an interrupt for a device we haven't enabled.
262	 * We had better not try and use -1 to find the right bit to disable.
263	 */
264	if (savirqs[irq] == -1) {
265		printf("kn300_iointr: stray interrupt vector 0x%lx\n", vec);
266		return;
267	}
268
269	/*
270	 * Stray interrupt; disable the IRQ on the appropriate MCPCIA
271	 * if we've reached the limit.
272	 */
273	alpha_shared_intr_stray(kn300_pci_intr, irq, "kn300 irq");
274	if (ALPHA_SHARED_INTR_DISABLE(kn300_pci_intr, irq) == 0)
275		return;
276	kn300_disable_intr(mcp->mcpcia_cc, savirqs[irq]);
277}
278
279void
280kn300_enable_intr(ccp, irq)
281	struct mcpcia_config *ccp;
282	int irq;
283{
284	alpha_mb();
285	REGVAL(MCPCIA_INT_MASK0(ccp)) |= (1 << irq);
286	alpha_mb();
287}
288
289void
290kn300_disable_intr(ccp, irq)
291	struct mcpcia_config *ccp;
292	int irq;
293{
294	alpha_mb();
295	REGVAL(MCPCIA_INT_MASK0(ccp)) &= ~(1 << irq);
296	alpha_mb();
297}
298