From eaef5f0af874690ec58b14be728d2e3d3df66579 Mon Sep 17 00:00:00 2001
From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Fri, 18 Jun 2010 14:06:27 +0000
Subject: Provide for multiple, cascaded PICs on PowerPC systems, and extend
 the OFW interrupt map interface to also return the device's interrupt parent.

MFC after:	8.1-RELEASE
---
 sys/dev/iicbus/iiconf.c    | 34 +++++++++++++++++++++++++++++-----
 sys/dev/ofw/ofw_bus_subr.c |  9 ++++++---
 sys/dev/ofw/ofw_bus_subr.h |  7 +++++--
 3 files changed, 40 insertions(+), 10 deletions(-)

(limited to 'sys/dev')

diff --git a/sys/dev/iicbus/iiconf.c b/sys/dev/iicbus/iiconf.c
index 1610b351e7453..e59dc35f18cd1 100644
--- a/sys/dev/iicbus/iiconf.c
+++ b/sys/dev/iicbus/iiconf.c
@@ -363,7 +363,7 @@ iicbus_transfer(device_t bus, struct iic_msg *msgs, uint32_t nmsgs)
 int
 iicbus_transfer_gen(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
 {
-	int i, error, lenread, lenwrote, nkid;
+	int i, error, lenread, lenwrote, nkid, rpstart, addr;
 	device_t *children, bus;
 
 	if ((error = device_get_children(dev, &children, &nkid)) != 0)
@@ -373,14 +373,38 @@ iicbus_transfer_gen(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
 		return (EIO);
 	}
 	bus = children[0];
+	rpstart = 0;
 	free(children, M_TEMP);
 	for (i = 0, error = 0; i < nmsgs && error == 0; i++) {
+		addr = msgs[i].slave;
 		if (msgs[i].flags & IIC_M_RD)
-			error = iicbus_block_read(bus, msgs[i].slave,
-			    msgs[i].buf, msgs[i].len, &lenread);
+			addr |= LSB;
 		else
-			error = iicbus_block_write(bus, msgs[i].slave,
-			    msgs[i].buf, msgs[i].len, &lenwrote);
+			addr &= ~LSB;
+
+		if (!(msgs[i].flags & IIC_M_NOSTART)) {
+			if (rpstart)
+				error = iicbus_repeated_start(bus, addr, 0);
+			else
+				error = iicbus_start(bus, addr, 0);
+		}
+
+		if (error)
+			break;
+
+		if (msgs[i].flags & IIC_M_RD)
+			error = iicbus_read(bus, msgs[i].buf, msgs[i].len,
+			    &lenread, IIC_LAST_READ, 0);
+		else
+			error = iicbus_write(bus, msgs[i].buf, msgs[i].len,
+			    &lenwrote, 0);
+
+		if (!(msgs[i].flags & IIC_M_NOSTOP)) {
+			rpstart = 0;
+			iicbus_stop(bus);
+		} else {
+			rpstart = 1;	/* Next message gets repeated start */
+		}
 	}
 	return (error);
 }
diff --git a/sys/dev/ofw/ofw_bus_subr.c b/sys/dev/ofw/ofw_bus_subr.c
index ae9379fd9af4c..cc648f5fc5c9f 100644
--- a/sys/dev/ofw/ofw_bus_subr.c
+++ b/sys/dev/ofw/ofw_bus_subr.c
@@ -222,7 +222,7 @@ ofw_bus_setup_iinfo(phandle_t node, struct ofw_bus_iinfo *ii, int intrsz)
 int
 ofw_bus_lookup_imap(phandle_t node, struct ofw_bus_iinfo *ii, void *reg,
     int regsz, void *pintr, int pintrsz, void *mintr, int mintrsz,
-    void *maskbuf)
+    phandle_t *iparent, void *maskbuf)
 {
 	int rv;
 
@@ -236,7 +236,7 @@ ofw_bus_lookup_imap(phandle_t node, struct ofw_bus_iinfo *ii, void *reg,
 		panic("ofw_bus_lookup_imap: could not get reg property");
 	return (ofw_bus_search_intrmap(pintr, pintrsz, reg, ii->opi_addrc,
 	    ii->opi_imap, ii->opi_imapsz, ii->opi_imapmsk, maskbuf, mintr,
-	    mintrsz));
+	    mintrsz, iparent));
 }
 
 /*
@@ -259,7 +259,7 @@ ofw_bus_lookup_imap(phandle_t node, struct ofw_bus_iinfo *ii, void *reg,
 int
 ofw_bus_search_intrmap(void *intr, int intrsz, void *regs, int physsz,
     void *imap, int imapsz, void *imapmsk, void *maskbuf, void *result,
-    int rintrsz)
+    int rintrsz, phandle_t *iparent)
 {
 	phandle_t parent;
 	uint8_t *ref = maskbuf;
@@ -303,6 +303,9 @@ ofw_bus_search_intrmap(void *intr, int intrsz, void *regs, int physsz,
 		if (bcmp(ref, mptr, physsz + intrsz) == 0) {
 			bcopy(mptr + physsz + intrsz + sizeof(parent),
 			    result, rintrsz);
+
+			if (iparent != NULL)
+				*iparent = parent;
 			return (1);
 		}
 		mptr += tsz;
diff --git a/sys/dev/ofw/ofw_bus_subr.h b/sys/dev/ofw/ofw_bus_subr.h
index 1e8376602da2d..512e8b38d07ed 100644
--- a/sys/dev/ofw/ofw_bus_subr.h
+++ b/sys/dev/ofw/ofw_bus_subr.h
@@ -63,9 +63,12 @@ bus_child_pnpinfo_str_t	ofw_bus_gen_child_pnpinfo_str;
 /* Routines for processing firmware interrupt maps */
 void	ofw_bus_setup_iinfo(phandle_t, struct ofw_bus_iinfo *, int);
 int	ofw_bus_lookup_imap(phandle_t, struct ofw_bus_iinfo *, void *, int,
-	    void *, int, void *, int, void *);
+	    void *, int, void *, int, phandle_t *, void *);
 int	ofw_bus_search_intrmap(void *, int, void *, int, void *, int, void *,
-	    void *, void *, int);
+	    void *, void *, int, phandle_t *);
+
+/* Helper to get node's interrupt parent */
+void	ofw_bus_find_iparent(phandle_t);
 
 /* Helper routine for checking compat prop */
 int ofw_bus_is_compatible(device_t, const char *);
-- 
cgit v1.3