Oops, missed these. Machine-independant ISA PnP enumerator.

1 files changed, 266 insertions, 0 deletions

diff --git a/sys/boot/common/isapnp.c b/sys/boot/common/isapnp.c
new file mode 100644
index 0000000..2678222
--- /dev/null
+++ b/sys/boot/common/isapnp.c
@@ -0,0 +1,266 @@
+/*
+ * Copyright (c) 1998, Michael Smith
+ * Copyright (c) 1996, Sujal M. Patel
+ * All rights reserved.
+ *
+ * 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 AUTHOR 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 AUTHOR 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.
+ *
+ *      $Id: pnp.c,v 1.5 1998/02/09 06:08:38 eivind Exp $
+ */
+
+/*
+ * Machine-independant ISA PnP enumerator implementing a subset of the
+ * ISA PnP specification.
+ */
+#include <stand.h>
+#include <string.h>
+#include <bootstrap.h>
+#include <isapnp.h>
+
+#define inb(x)		(archsw.arch_isainb((x)))
+#define outb(x,y)	(archsw.arch_isaoutb((x),(y)))
+
+static void	isapnp_write(int d, u_char r);
+static u_char	isapnp_read(int d);
+static void	isapnp_send_Initiation_LFSR();
+static int	isapnp_get_serial(u_int8_t *p);
+static int	isapnp_isolation_protocol(struct pnpinfo **pnplist);
+static void	isapnp_enumerate(struct pnpinfo **pnplist);
+
+/* PnP read data port */
+static int	pnp_rd_port;
+
+#define _PNP_ID_LEN	9
+
+struct pnphandler isapnphandler =
+{
+    "isapnp",
+    isapnp_enumerate
+};
+
+static void
+isapnp_write(int d, u_char r)
+{
+    outb (_PNP_ADDRESS, d);
+    outb (_PNP_WRITE_DATA, r);
+}
+
+static u_char
+isapnp_read(int d)
+{
+    outb (_PNP_ADDRESS, d);
+    return (inb(3 | (pnp_rd_port <<2)));
+}
+
+/*
+ * Send Initiation LFSR as described in "Plug and Play ISA Specification",
+ * Intel May 94.
+ */
+static void
+isapnp_send_Initiation_LFSR()
+{
+    int cur, i;
+
+    /* Reset the LSFR */
+    outb(_PNP_ADDRESS, 0);
+    outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
+
+    cur = 0x6a;
+    outb(_PNP_ADDRESS, cur);
+
+    for (i = 1; i < 32; i++) {
+	cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
+	outb(_PNP_ADDRESS, cur);
+    }
+}
+
+/*
+ * Get the device's serial number.  Returns 1 if the serial is valid.
+ */
+static int
+isapnp_get_serial(u_int8_t *data)
+{
+    int		i, bit, valid = 0, sum = 0x6a;
+
+    bzero(data, _PNP_ID_LEN);
+    outb(_PNP_ADDRESS, SERIAL_ISOLATION);
+    for (i = 0; i < 72; i++) {
+	bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
+	delay(250);	/* Delay 250 usec */
+
+	/* Can't Short Circuit the next evaluation, so 'and' is last */
+	bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
+	delay(250);	/* Delay 250 usec */
+
+	valid = valid || bit;
+
+	if (i < 64)
+	    sum = (sum >> 1) |
+		(((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
+
+	data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
+    }
+
+    valid = valid && (data[8] == sum);
+
+    return valid;
+}
+
+/*
+ * Format a pnp id as a string in standard ISA PnP format, 0x<hex identifier>
+ */
+static char *
+isapnp_format(u_int8_t *data)
+{
+    static char	idbuf[16];
+    u_int32_t	i;
+    
+    i = data[3];
+    i = (i << 8) + data[2];
+    i = (i << 8) + data[1];
+    i = (i << 8) + data[0];
+    sprintf(idbuf, "0x%08x", i);
+    return(idbuf);
+}
+
+/*
+ * Try to read a compatible device ID from the current device, return
+ * 1 if we found one.
+ */
+#define READ_RSC(c)	{while ((isapnp_read(STATUS) & 1) == 0); (c) = isapnp_read(RESOURCE_DATA);}
+static int
+isapnp_getid(u_int8_t *data)
+{
+    int		discard, pos, len;
+    u_int8_t	c, t;
+    
+    discard = 0;
+    len = 0;
+    pos = 0;
+    
+    for (;;) {
+	READ_RSC(c);
+	/* skipping junk? */
+	if (discard > 0) {
+	    discard--;
+	    continue;
+	}
+	/* copying data? */
+	if (len > 0) {
+	    data[pos++] = c;
+	    /* got all data? */
+	    if (pos >= len)
+		return(1);
+	}
+	/* resource type */
+	if (c & 0x80) {		/* large resource, throw it away */
+	    if (c == 0xff)
+		return(0);	/* end of resources */
+	    READ_RSC(c);
+	    discard = c;
+	    READ_RSC(c);
+	    discard += ((int)c << 8);
+	    continue;
+	}
+	/* small resource */
+	t = (c >> 3) & 0xf;
+	if (t == 0xf)
+	    return(0);		/* end of resources */
+	if ((t == LOG_DEVICE_ID) || (t == COMP_DEVICE_ID)) {
+	    len = c & 7;
+	    pos = 0;
+	    continue;
+	}
+	discard = c & 7;	/* unwanted small resource */
+    }
+    
+}
+
+
+/*
+ * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
+ * value (caller should try multiple READ_DATA locations before giving
+ * up). Upon exiting, all cards are aware that they should use
+ * pnp_rd_port as the READ_DATA port.
+ */
+static int
+isapnp_isolation_protocol(struct pnpinfo **pilist)
+{
+    int			csn;
+    struct pnpinfo	*pi;
+    u_int8_t		cardid[_PNP_ID_LEN];
+    int			ndevs;
+
+    isapnp_send_Initiation_LFSR();
+    ndevs = 0;
+    
+    isapnp_write(CONFIG_CONTROL, 0x04);	/* Reset CSN for All Cards */
+
+    for (csn = 1; ; csn++) {
+	/* Wake up cards without a CSN (ie. all of them) */
+	isapnp_write(WAKE, 0);
+	isapnp_write(SET_RD_DATA, pnp_rd_port);
+	outb(_PNP_ADDRESS, SERIAL_ISOLATION);
+	delay(1000);	/* Delay 1 msec */
+
+	if (isapnp_get_serial(cardid)) {
+	    isapnp_write(SET_CSN, csn);
+	    pi = malloc(sizeof(struct pnpinfo));
+	    pi->pi_next = *pilist;
+	    *pilist = pi;
+	    ndevs++;
+	    /* scan the card obtaining all the identifiers it holds */
+	    while (isapnp_getid(cardid)) {
+		printf("   %s\n", isapnp_format(cardid));
+		pnp_addident(pi, isapnp_format(cardid));
+	    }
+	} else
+	    break;
+    }
+    /* Move all cards to wait-for-key state */
+    while (csn >= 0) {
+	isapnp_send_Initiation_LFSR();
+	isapnp_write(WAKE, csn);
+	isapnp_write(CONFIG_CONTROL, 0x02);
+	delay(1000); /* XXX is it really necessary ? */
+    }
+    return(ndevs);
+}
+
+/*
+ * Locate ISA-PnP devices and populate the supplied list.
+ */
+static void
+isapnp_enumerate(struct pnpinfo **pnplist) 
+{
+    int			devs;
+
+    for (pnp_rd_port = 0x80; pnp_rd_port < 0xff; pnp_rd_port += 0x10) {
+	
+	/* Look for something, quit when we find it */
+	if ((devs = isapnp_isolation_protocol(pnplist)) > 0)
+	    break;
+    }
+    printf("Found %d ISA PnP devices\n", devs);
+}
+
+