px.c revision 1.6 
1/* 	$NetBSD: px.c,v 1.6 2001/04/22 16:44:41 thorpej Exp $	*/
2
3/*-
4 * Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Doran.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, 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. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the NetBSD
21 *	Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39/*
40 * Driver for DEC PixelStamp graphics adapters (PMAG-C).
41 */
42
43#include <sys/param.h>
44#include <sys/types.h>
45#include <sys/systm.h>
46#include <sys/device.h>
47#include <sys/malloc.h>
48#include <sys/callout.h>
49
50#include <uvm/uvm_extern.h>
51
52#if defined(pmax)
53#include <mips/cpuregs.h>
54#elif defined(alpha)
55#include <alpha/alpha_cpu.h>
56#endif
57
58#include <machine/autoconf.h>
59#include <machine/cpu.h>
60#include <machine/bus.h>
61
62#include <dev/cons.h>
63
64#include <dev/wscons/wsconsio.h>
65#include <dev/wscons/wsdisplayvar.h>
66
67#include <dev/ic/bt459reg.h>
68
69#include <dev/tc/tcvar.h>
70#include <dev/tc/sticreg.h>
71#include <dev/tc/sticvar.h>
72
73#define	PX_STIC_POLL_OFFSET	0x000000	/* STIC DMA poll space */
74#define	PX_STAMP_OFFSET		0x0c0000	/* pixelstamp space on STIC */
75#define	PX_STIC_OFFSET		0x180000	/* STIC registers */
76#define	PX_VDAC_OFFSET		0x200000	/* VDAC registers (bt459) */
77#define	PX_VDAC_RESET_OFFSET	0x300000	/* VDAC reset register */
78#define	PX_ROM_OFFSET		0x300000	/* ROM code */
79
80#define	PX_BUF_SIZE		(STIC_PACKET_SIZE*2 + STIC_IMGBUF_SIZE*2)
81#define	PX_BUF_ALIGN		32768
82
83static void	px_attach(struct device *, struct device *, void *);
84static void	px_init(struct stic_info *, int);
85static int	px_match(struct device *, struct cfdata *, void *);
86
87static int	px_intr(void *);
88static u_int32_t	*px_pbuf_get(struct stic_info *);
89static int	px_pbuf_post(struct stic_info *, u_int32_t *);
90
91void	px_cnattach(tc_addr_t);
92
93struct px_softc {
94	struct	device px_dv;
95	struct	stic_info *px_si;
96};
97
98struct cfattach px_ca = {
99	sizeof(struct px_softc), px_match, px_attach
100};
101
102static int
103px_match(struct device *parent, struct cfdata *match, void *aux)
104{
105	struct tc_attach_args *ta;
106
107	ta = aux;
108
109	return (strncmp("PMAG-CA ", ta->ta_modname, TC_ROM_LLEN) == 0);
110}
111
112static void
113px_attach(struct device *parent, struct device *self, void *aux)
114{
115	struct stic_info *si;
116	struct tc_attach_args *ta;
117	struct px_softc *px;
118	int console;
119
120	px = (struct px_softc *)self;
121	ta = (struct tc_attach_args *)aux;
122
123	if (ta->ta_addr == stic_consinfo.si_slotbase) {
124		si = &stic_consinfo;
125		console = 1;
126	} else {
127		if (stic_consinfo.si_slotbase == NULL)
128			si = &stic_consinfo;
129		else {
130			si = malloc(sizeof(*si), M_DEVBUF, M_NOWAIT);
131			memset(si, 0, sizeof(*si));
132		}
133		si->si_slotbase = ta->ta_addr;
134		px_init(si, 0);
135		console = 0;
136	}
137
138	px->px_si = si;
139	tc_intr_establish(parent, ta->ta_cookie, IPL_TTY, px_intr, si);
140
141	printf(": 2DA, 8 plane, %dx%d stamp\n", si->si_stampw, si->si_stamph);
142
143	stic_attach(self, si, console);
144}
145
146void
147px_cnattach(tc_addr_t addr)
148{
149	struct stic_info *si;
150
151	si = &stic_consinfo;
152	si->si_slotbase = addr;
153	px_init(si, 1);
154	stic_cnattach(si);
155}
156
157static void
158px_init(struct stic_info *si, int bootstrap)
159{
160	struct pglist pglist;
161	caddr_t kva;
162	paddr_t bpa;
163
164	/*
165	 * Allocate memory for the packet buffers.  It must be located below
166	 * 8MB, since the STIC can't access outside that region.  Also, due
167	 * to the holes in STIC address space, each buffer mustn't cross a
168	 * 32kB boundary.
169	 */
170	if (bootstrap) {
171		/*
172		 * UVM won't be initalised at this point, so grab memory
173		 * directly from vm_physmem[].
174		 */
175		kva = (caddr_t)uvm_pageboot_alloc(PX_BUF_SIZE + PX_BUF_ALIGN);
176		bpa = (STIC_KSEG_TO_PHYS(kva) + PX_BUF_ALIGN - 1) &
177		    ~(PX_BUF_ALIGN - 1);
178		if (bpa + PX_BUF_SIZE > 8192*1024)
179			panic("px_init: allocation out of bounds");
180	} else {
181		TAILQ_INIT(&pglist);
182		if (uvm_pglistalloc(PX_BUF_SIZE, 0, 8192*1024, PX_BUF_ALIGN,
183		    PX_BUF_ALIGN, &pglist, 1, 0) != 0)
184			panic("px_init: allocation failure");
185		bpa = TAILQ_FIRST(&pglist)->phys_addr;
186	}
187
188	kva = (caddr_t)TC_PHYS_TO_UNCACHED(si->si_slotbase);
189
190	si->si_vdac = (u_int32_t *)(kva + PX_VDAC_OFFSET);
191	si->si_vdac_reset = (u_int32_t *)(kva + PX_VDAC_RESET_OFFSET);
192	si->si_stic = (volatile struct stic_regs *)(kva + PX_STIC_OFFSET);
193	si->si_stamp = (u_int32_t *)(kva + PX_STAMP_OFFSET);
194	si->si_buf = (u_int32_t *)TC_PHYS_TO_UNCACHED(bpa);
195	si->si_buf_phys =  bpa;
196	si->si_buf_size = PX_BUF_SIZE;
197	si->si_disptype = WSDISPLAY_TYPE_PX;
198	si->si_depth = 8;
199
200	si->si_pbuf_get = px_pbuf_get;
201	si->si_pbuf_post = px_pbuf_post;
202
203	memset(si->si_buf, 0, PX_BUF_SIZE);
204
205	stic_init(si);
206}
207
208static int
209px_intr(void *cookie)
210{
211	volatile struct stic_regs *sr;
212	struct stic_info *si;
213	int state;
214
215	si = cookie;
216	sr = si->si_stic;
217	state = sr->sr_ipdvint;
218
219	if ((state & STIC_INT_V) != 0) {
220		sr->sr_ipdvint =
221		    STIC_INT_V_WE | (sr->sr_ipdvint & STIC_INT_V_EN);
222		tc_wmb();
223		stic_flush(si);
224	}
225
226#ifdef DEBUG
227	if ((sr->sr_ipdvint & STIC_INT_E) != 0) {
228		printf("%s: error intr, %x %x %x %x %x", si->si_dv.dv_xname,
229		    sr->sr_ipdvint, sr->sr_sticsr, sr->sr_buscsr,
230		    sr->sr_busadr, sr->sr_busdat);
231	}
232#endif
233
234	return (1);
235}
236
237static u_int32_t *
238px_pbuf_get(struct stic_info *si)
239{
240
241	si->si_pbuf_select ^= STIC_PACKET_SIZE;
242	return ((u_int32_t *)((caddr_t)si->si_buf + si->si_pbuf_select));
243}
244
245static int
246px_pbuf_post(struct stic_info *si, u_int32_t *buf)
247{
248	volatile u_int32_t *poll, junk;
249	volatile struct stic_regs *sr;
250	u_long v;
251	int c;
252
253	sr = si->si_stic;
254
255	/* Get address of poll register for this buffer. */
256	v = (u_long)STIC_KSEG_TO_PHYS(buf);
257	v = ((v & 0xffff8000) << 3) | (v & 0x7fff);
258	poll = (volatile u_int32_t *)((caddr_t)si->si_slotbase + (v >> 9));
259
260	/*
261	 * Read the poll register and make sure the stamp wants to accept
262	 * our packet.  This read will initiate the DMA.  Don't wait for
263	 * ever, just in case something's wrong.
264	 */
265	tc_mb();
266
267	for (c = STAMP_RETRIES; c != 0; c--) {
268		if ((sr->sr_ipdvint & STIC_INT_P) != 0) {
269			sr->sr_ipdvint = STIC_INT_P_WE | STIC_INT_P_EN;
270			tc_wmb();
271			junk = *poll;
272			return (0);
273		}
274		DELAY(STAMP_DELAY);
275	}
276
277	/* STIC has lost the plot, punish it. */
278	stic_reset(si);
279	return (-1);
280}
281