NetBSD-5.0.2/sys/dev/tc/px.c
/* $NetBSD: px.c,v 1.34 2008/07/09 13:19:33 joerg Exp $ */
/*-
* Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Doran.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Driver for DEC PixelStamp graphics adapters (PMAG-C).
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: px.c,v 1.34 2008/07/09 13:19:33 joerg Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/callout.h>
#include <uvm/uvm_extern.h>
#if defined(pmax)
#include <mips/cpuregs.h>
#elif defined(alpha)
#include <alpha/alpha_cpu.h>
#endif
#include <machine/autoconf.h>
#include <sys/cpu.h>
#include <sys/bus.h>
#include <dev/cons.h>
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>
#include <dev/ic/bt459reg.h>
#include <dev/tc/tcvar.h>
#include <dev/tc/sticreg.h>
#include <dev/tc/sticio.h>
#include <dev/tc/sticvar.h>
#define PX_STIC_POLL_OFFSET 0x000000 /* STIC DMA poll space */
#define PX_STAMP_OFFSET 0x0c0000 /* pixelstamp space on STIC */
#define PX_STIC_OFFSET 0x180000 /* STIC registers */
#define PX_VDAC_OFFSET 0x200000 /* VDAC registers (bt459) */
#define PX_VDAC_RESET_OFFSET 0x300000 /* VDAC reset register */
#define PX_ROM_OFFSET 0x300000 /* ROM code */
#define PX_BUF_COUNT 16
#define PX_BUF_INC(x) ((x + 1) & (PX_BUF_COUNT - 1))
/*
* We need enough aligned memory to hold:
*
* - Xserver communication area (4096 bytes)
* - 16 packet buffers (4096 bytes each)
* - 2 image buffers (5120 bytes each)
*
*/
#define PX_BUF_SIZE \
(STIC_PACKET_SIZE * PX_BUF_COUNT + STIC_IMGBUF_SIZE*2 + STIC_XCOMM_SIZE)
#define PX_BUF_ALIGN 32768
#define PXF_QUEUE 0x01
static void px_attach(struct device *, struct device *, void *);
static void px_init(struct stic_info *, int);
static int px_ioctl(struct stic_info *, u_long, void *, int,
struct lwp *);
static int px_match(struct device *, struct cfdata *, void *);
static int px_intr(void *);
static uint32_t *px_pbuf_get(struct stic_info *);
static int px_pbuf_post(struct stic_info *, u_int32_t *);
void px_cnattach(tc_addr_t);
struct px_softc {
device_t px_dev;
struct stic_info *px_si;
volatile u_int32_t *px_qpoll[PX_BUF_COUNT];
};
CFATTACH_DECL_NEW(px, sizeof(struct px_softc),
px_match, px_attach, NULL, NULL);
static int
px_match(device_t parent, cfdata_t match, void *aux)
{
struct tc_attach_args *ta;
ta = aux;
return (strncmp("PMAG-CA ", ta->ta_modname, TC_ROM_LLEN) == 0);
}
static void
px_attach(device_t parent, device_t self, void *aux)
{
struct stic_info *si;
struct tc_attach_args *ta;
struct px_softc *px;
int console, i;
u_long v;
px = device_private(self);
ta = (struct tc_attach_args *)aux;
px->px_dev = self;
if (ta->ta_addr == stic_consinfo.si_slotbase) {
si = &stic_consinfo;
console = 1;
} else {
if (stic_consinfo.si_slotbase == 0)
si = &stic_consinfo;
else {
si = malloc(sizeof(*si), M_DEVBUF, M_NOWAIT|M_ZERO);
}
si->si_slotbase = ta->ta_addr;
px_init(si, 0);
console = 0;
}
px->px_si = si;
si->si_dv = self;
tc_intr_establish(parent, ta->ta_cookie, IPL_TTY, px_intr, si);
printf(": 8 plane, %dx%d stamp\n", si->si_stampw, si->si_stamph);
for (i = 0; i < PX_BUF_COUNT; i++) {
v = i * STIC_PACKET_SIZE +
si->si_buf_phys + STIC_XCOMM_SIZE;
v = ((v & 0xffff8000) << 3) | (v & 0x7fff);
px->px_qpoll[i] = (volatile u_int32_t *)
((char *)si->si_slotbase + (v >> 9));
}
stic_attach(self, si, console);
}
void
px_cnattach(tc_addr_t addr)
{
struct stic_info *si;
si = &stic_consinfo;
si->si_slotbase = addr;
px_init(si, 1);
stic_cnattach(si);
}
static void
px_init(struct stic_info *si, int bootstrap)
{
struct pglist pglist;
char *kva, *bva;
paddr_t bpa;
kva = (void *)si->si_slotbase;
/*
* Allocate memory for the packet buffers. It must be located below
* 8MB, since the STIC can't access outside that region. Also, due
* to the holes in STIC address space, each buffer mustn't cross a
* 32kB boundary.
*/
if (bootstrap) {
/*
* UVM won't be initialised at this point, so grab memory
* directly from vm_physmem[].
*/
bva = (char *)uvm_pageboot_alloc(PX_BUF_SIZE + PX_BUF_ALIGN);
bpa = (STIC_KSEG_TO_PHYS(bva) + PX_BUF_ALIGN - 1) &
~(PX_BUF_ALIGN - 1);
if (bpa + PX_BUF_SIZE > 8192*1024)
panic("px_init: allocation out of bounds");
} else {
if (uvm_pglistalloc(PX_BUF_SIZE, 0, 8192*1024, PX_BUF_ALIGN,
0, &pglist, 1, 0) != 0)
panic("px_init: allocation failure");
bpa = VM_PAGE_TO_PHYS(TAILQ_FIRST(&pglist));
}
si->si_vdac = (u_int32_t *)(kva + PX_VDAC_OFFSET);
si->si_vdac_reset = (u_int32_t *)(kva + PX_VDAC_RESET_OFFSET);
si->si_stic = (volatile struct stic_regs *)(kva + PX_STIC_OFFSET);
si->si_stamp = (u_int32_t *)(kva + PX_STAMP_OFFSET);
si->si_buf = (u_int32_t *)TC_PHYS_TO_UNCACHED(bpa);
si->si_buf_phys = bpa;
si->si_buf_size = PX_BUF_SIZE;
si->si_disptype = WSDISPLAY_TYPE_PX;
si->si_depth = 8;
si->si_sxc = (volatile struct stic_xcomm *)si->si_buf;
si->si_pbuf_get = px_pbuf_get;
si->si_pbuf_post = px_pbuf_post;
si->si_ioctl = px_ioctl;
memset(si->si_buf, 0, PX_BUF_SIZE);
stic_init(si);
}
static int
px_intr(void *cookie)
{
volatile struct stic_regs *sr;
volatile struct stic_xcomm *sxc;
struct stic_info *si;
struct px_softc *px;
int state;
si = cookie;
px = (struct px_softc *)si->si_dv;
sr = si->si_stic;
state = sr->sr_ipdvint;
sxc = si->si_sxc;
/*
* Vertical-retrace condition.
*
* Clear the flag and flush out any waiting VDAC updates. We do
* this at retrace time to avoid producing `shearing' and other
* nasty artifacts.
*/
if ((state & STIC_INT_V) != 0) {
sr->sr_ipdvint = STIC_INT_V_WE | STIC_INT_V_EN;
tc_wmb();
stic_flush(si);
}
/*
* Error condition.
*
* Simply clear the flag and report the error.
*/
if ((state & STIC_INT_E) != 0) {
aprint_error_dev(px->px_dev, "error intr, %x %x %x %x %x",
sr->sr_ipdvint, sr->sr_sticsr, sr->sr_buscsr,
sr->sr_busadr, sr->sr_busdat);
sr->sr_ipdvint = STIC_INT_E_WE | STIC_INT_E_EN;
tc_wmb();
}
/*
* Check for queue stalls.
*/
if (sxc->sxc_tail != sxc->sxc_head && !sxc->sxc_busy)
state |= STIC_INT_P;
/*
* Packet-done condition.
*
* If packet queueing is enabled, clear the condition, and increment
* the tail (submitted) pointer.
*/
if ((si->si_hwflags & PXF_QUEUE) != 0 && (state & STIC_INT_P) != 0) {
sr->sr_ipdvint = STIC_INT_P_WE | STIC_INT_P_EN;
tc_wmb();
if (sxc->sxc_tail != sxc->sxc_head) {
sxc->sxc_done[sxc->sxc_tail] = 0;
sxc->sxc_tail = PX_BUF_INC(sxc->sxc_tail);
}
if (sxc->sxc_tail != sxc->sxc_head) {
if (*px->px_qpoll[sxc->sxc_tail] != STAMP_OK) {
sxc->sxc_nreject++;
sxc->sxc_busy = 0;
} else
sxc->sxc_busy = 1;
} else
sxc->sxc_busy = 0;
}
if ((si->si_hwflags & PXF_QUEUE) != 0 && (state & STIC_INT_P_EN) == 0)
printf("px_intr: STIC_INT_P_EN == 0\n");
return (1);
}
static uint32_t *
px_pbuf_get(struct stic_info *si)
{
u_long off;
si->si_pbuf_select ^= STIC_PACKET_SIZE;
off = si->si_pbuf_select + STIC_XCOMM_SIZE;
return ((u_int32_t *)((char *)si->si_buf + off));
}
static int
px_pbuf_post(struct stic_info *si, u_int32_t *buf)
{
volatile u_int32_t *poll, junk;
volatile struct stic_regs *sr;
u_long v;
int c;
sr = si->si_stic;
/* Get address of poll register for this buffer. */
v = (u_long)STIC_KSEG_TO_PHYS(buf);
v = ((v & 0xffff8000) << 3) | (v & 0x7fff);
poll = (volatile u_int32_t *)((char *)si->si_slotbase + (v >> 9));
/*
* Read the poll register and make sure the stamp wants to accept
* our packet. This read will initiate the DMA. Don't wait for
* ever, just in case something's wrong.
*/
tc_mb();
for (c = STAMP_RETRIES; c != 0; c--) {
if ((sr->sr_ipdvint & STIC_INT_P) != 0) {
sr->sr_ipdvint = STIC_INT_P_WE;
tc_wmb();
junk = *poll;
return (0);
}
DELAY(STAMP_DELAY);
}
/* STIC has lost the plot, punish it. */
stic_reset(si);
return (-1);
}
static int
px_ioctl(struct stic_info *si, u_long cmd, void *data, int flag,
struct lwp *l)
{
volatile struct stic_xcomm *sxc;
volatile struct stic_regs *sr;
struct stic_xinfo *sxi;
int rv, s;
sr = si->si_stic;
switch (cmd) {
case STICIO_STARTQ:
if (si->si_dispmode != WSDISPLAYIO_MODE_MAPPED ||
(si->si_hwflags & PXF_QUEUE) != 0) {
rv = EBUSY;
break;
}
sxc = si->si_sxc;
memset((void *)__UNVOLATILE(sxc->sxc_done), 0,
sizeof(sxc->sxc_done));
sxc->sxc_head = 0;
sxc->sxc_tail = 0;
sxc->sxc_nreject = 0;
sxc->sxc_nstall = 0;
s = spltty();
si->si_hwflags |= PXF_QUEUE;
sr->sr_ipdvint = STIC_INT_P_WE | STIC_INT_P_EN;
tc_wmb();
splx(s);
rv = 0;
break;
case STICIO_STOPQ:
s = spltty();
si->si_hwflags &= ~PXF_QUEUE;
sr->sr_ipdvint = STIC_INT_P_WE | STIC_INT_P;
tc_wmb();
splx(s);
rv = 0;
break;
case STICIO_GXINFO:
sxi = (struct stic_xinfo *)data;
sxi->sxi_unit = si->si_unit;
sxi->sxi_stampw = si->si_stampw;
sxi->sxi_stamph = si->si_stamph;
sxi->sxi_buf_size = si->si_buf_size;
sxi->sxi_buf_phys = (u_int)si->si_buf_phys;
sxi->sxi_buf_pktoff = STIC_XCOMM_SIZE;
sxi->sxi_buf_pktcnt = PX_BUF_COUNT;
sxi->sxi_buf_imgoff =
STIC_XCOMM_SIZE + STIC_PACKET_SIZE * PX_BUF_COUNT;
rv = 0;
break;
default:
rv = EPASSTHROUGH;
break;
}
return (rv);
}