From 21a8f93615618fc67c96c22c959dacf4e044330f Mon Sep 17 00:00:00 2001
From: nwhitehorn <nwhitehorn@FreeBSD.org>
Date: Sat, 30 Oct 2010 23:09:56 +0000
Subject: [PATCH] Allow access to the HT I/O port space on the IBM CPC9X5
 northbridge chips.

MFC after:	2 weeks
---
 sys/powerpc/powermac/cpcht.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/sys/powerpc/powermac/cpcht.c b/sys/powerpc/powermac/cpcht.c
index 3af4d608c64e..ab5c870f8373 100644
--- a/sys/powerpc/powermac/cpcht.c
+++ b/sys/powerpc/powermac/cpcht.c
@@ -162,6 +162,7 @@ struct cpcht_softc {
 	vm_offset_t		sc_data;
 	uint64_t		sc_populated_slots;
 	struct			rman sc_mem_rman;
+	struct			rman sc_io_rman;
 
 	struct cpcht_irq	htirq_map[128];
 	struct mtx		htirq_mtx;
@@ -177,6 +178,9 @@ static devclass_t	cpcht_devclass;
 
 DRIVER_MODULE(cpcht, nexus, cpcht_driver, cpcht_devclass, 0, 0);
 
+#define CPCHT_IOPORT_BASE	0xf4000000UL /* Hardwired */
+#define CPCHT_IOPORT_SIZE	0x00400000UL
+
 #define HTAPIC_REQUEST_EOI	0x20
 #define HTAPIC_TRIGGER_LEVEL	0x02
 #define HTAPIC_MASK		0x01
@@ -236,7 +240,14 @@ cpcht_attach(device_t dev)
 	sc->sc_mem_rman.rm_type = RMAN_ARRAY;
 	sc->sc_mem_rman.rm_descr = "CPCHT Device Memory";
 	error = rman_init(&sc->sc_mem_rman);
+	if (error) {
+		device_printf(dev, "rman_init() failed. error = %d\n", error);
+		return (error);
+	}
 
+	sc->sc_io_rman.rm_type = RMAN_ARRAY;
+	sc->sc_io_rman.rm_descr = "CPCHT I/O Memory";
+	error = rman_init(&sc->sc_io_rman);
 	if (error) {
 		device_printf(dev, "rman_init() failed. error = %d\n", error);
 		return (error);
@@ -248,6 +259,9 @@ cpcht_attach(device_t dev)
 	 * where we get the HT interrupts properties.
 	 */
 
+	/* I/O port mappings are usually not in the device tree */
+	rman_manage_region(&sc->sc_io_rman, 0, CPCHT_IOPORT_SIZE - 1);
+
 	bzero(sc->htirq_map, sizeof(sc->htirq_map));
 	mtx_init(&sc->htirq_mtx, "cpcht irq", NULL, MTX_DEF);
 	for (i = 0; i < 8; i++)
@@ -299,6 +313,9 @@ cpcht_configure_htbridge(device_t dev, phandle_t child)
 		case OFW_PCI_PHYS_HI_SPACE_CONFIG:
 			break;
 		case OFW_PCI_PHYS_HI_SPACE_IO:
+			rman_manage_region(&sc->sc_io_rman, rp->pci_lo,
+			    rp->pci_lo + rp->size_lo - 1);
+			break;
 		case OFW_PCI_PHYS_HI_SPACE_MEM32:
 			rman_manage_region(&sc->sc_mem_rman, rp->pci_lo,
 			    rp->pci_lo + rp->size_lo - 1);
@@ -507,8 +524,9 @@ cpcht_alloc_resource(device_t bus, device_t child, int type, int *rid,
 	switch (type) {
 	case SYS_RES_IOPORT:
 		end = min(end, start + count);
+		rm = &sc->sc_io_rman;
+		break;
 
-		/* FALLTHROUGH */
 	case SYS_RES_MEMORY:
 		rm = &sc->sc_mem_rman;
 		break;
@@ -562,6 +580,9 @@ cpcht_activate_resource(device_t bus, device_t child, int type, int rid,
 
 		start = (vm_offset_t)rman_get_start(res);
 
+		if (type == SYS_RES_IOPORT)
+			start += CPCHT_IOPORT_BASE;
+
 		if (bootverbose)
 			printf("cpcht mapdev: start %zx, len %ld\n", start,
 			    rman_get_size(res));