Improve handling of Local Access Windows on MPC85xx systems:

- detect number of LAWs in run time and initalize accordingly
- introduce decode windows target IDs used in MPC8572
- other minor updates

Obtained from:	Freescale, Semihalf

sys/powerpc/include/cpufunc.h

@@ -44,6 +44,7 @@ powerpc_mb(void)
 #include <sys/types.h>
 
 #include <machine/psl.h>
+#include <machine/spr.h>
 
 struct thread;
 
@@ -122,6 +123,16 @@ mfpvr(void)
 	return (value);
 }
 
+static __inline register_t
+mfsvr(void)
+{
+	register_t	value;
+
+	__asm __volatile ("mfspr %0, %1" : "=r"(value) : "K"(SPR_SVR));
+
+	return (value);
+}
+
 static __inline void
 eieio(void)
 {

sys/powerpc/mpc85xx/ocpbus.c

@@ -113,6 +113,8 @@ devclass_t ocpbus_devclass;
 
 DRIVER_MODULE(ocpbus, nexus, ocpbus_driver, ocpbus_devclass, 0, 0);
 
+static int law_max = 0;
+
 static __inline uint32_t
 ccsr_read4(uintptr_t addr)
 {
@@ -204,18 +206,18 @@ ocpbus_write_law(int trgt, int type, u_long *startp, u_long *countp)
 	sr = 0x80000000 | (trgt << 20) | (ffsl(size) - 2);
 
 	/* Check if already programmed. */
-	for (i = 0; i < 8; i++) {
+	for (i = 0; i < law_max; i++) {
 		if (sr == ccsr_read4(OCP85XX_LAWSR(i)) &&
 		    bar == ccsr_read4(OCP85XX_LAWBAR(i)))
 			return (0);
 	}
 
 	/* Find an unused access window .*/
-	for (i = 0; i < 8; i++) {
+	for (i = 0; i < law_max; i++) {
 		if ((ccsr_read4(OCP85XX_LAWSR(i)) & 0x80000000) == 0)
 			break;
 	}
-	if (i == 8)
+	if (i == law_max)
 		return (ENOSPC);
 
 	ccsr_write4(OCP85XX_LAWBAR(i), bar);
@@ -226,6 +228,16 @@ ocpbus_write_law(int trgt, int type, u_long *startp, u_long *countp)
 static int
 ocpbus_probe (device_t dev)
 {
+	struct ocpbus_softc *sc;
+	uint32_t svr;
+
+	sc = device_get_softc(dev);
+
+	svr = mfsvr();
+	if (svr == SVR_MPC8572E || svr == SVR_MPC8572)
+		law_max = 12;
+	else
+		law_max = 8;
 
 	device_set_desc(dev, "On-Chip Peripherals bus");
 	return (BUS_PROBE_DEFAULT);
@@ -234,10 +246,10 @@ ocpbus_probe (device_t dev)
 static int
 ocpbus_attach (device_t dev)
 {
-	struct ocpbus_softc	*sc;
-	int			error, i;
-	uint32_t		sr;
-	u_long			start, end;
+	struct ocpbus_softc *sc;
+	int error, i, tgt;
+	uint32_t sr;
+	u_long start, end;
 
 	sc = device_get_softc(dev);
 
@@ -284,13 +296,18 @@ ocpbus_attach (device_t dev)
 		return (error);
 	}
 
-	/* Clear local access windows. */
-	for (i = 0; i < 8; i++) {
+	/*
+	 * Clear local access windows. Skip DRAM entries, so we don't shoot
+	 * ourselves in the foot.
+	 */
+	for (i = 0; i < law_max; i++) {
 		sr = ccsr_read4(OCP85XX_LAWSR(i));
 		if ((sr & 0x80000000) == 0)
 			continue;
-		if ((sr & 0x00f00000) == 0x00f00000)
+		tgt = (sr & 0x01f00000) >> 20;
+		if (tgt == OCP85XX_TGTIF_RAM1 || tgt == OCP85XX_TGTIF_RAM2)
 			continue;
+
 		ccsr_write4(OCP85XX_LAWSR(i), sr & 0x7fffffff);
 	}
 
@@ -597,7 +614,7 @@ static int
 ocpbus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
     driver_filter_t *filter, driver_intr_t *ihand, void *arg, void **cookiep)
 {
-	int	error;
+	int error;
 
 	if (res == NULL)
 		panic("ocpbus_setup_intr: NULL irq resource!");

sys/powerpc/mpc85xx/ocpbus.h

@@ -36,6 +36,15 @@
 #define	OCP85XX_LAWBAR(n)	(CCSRBAR_VA + 0xc08 + 0x20 * (n))
 #define	OCP85XX_LAWSR(n)	(CCSRBAR_VA + 0xc10 + 0x20 * (n))
 
+#define	OCP85XX_TGTIF_PCI0	0
+#define	OCP85XX_TGTIF_PCI1	1
+#define	OCP85XX_TGTIF_PCI2	2
+#define	OCP85XX_TGTIF_LBC	4
+#define	OCP85XX_TGTIF_RAM_INTL	11
+#define	OCP85XX_TGTIF_RIO	12
+#define	OCP85XX_TGTIF_RAM1	15
+#define	OCP85XX_TGTIF_RAM2	22
+
 /*
  * Power-On Reset configuration.
  */
@@ -67,12 +76,6 @@
 #define	OCP85XX_QUICC_OFF	0x80000
 #define	OCP85XX_QUICC_SIZE	0x20000
 
-#define	OCP85XX_TGTIF_PCI0	0
-#define	OCP85XX_TGTIF_PCI1	1
-#define	OCP85XX_TGTIF_PCI2	2
-#define	OCP85XX_TGTIF_LBC	4
-#define	OCP85XX_TGTIF_RAM	15
-
 /*
  * PIC definitions
  */

sys/powerpc/mpc85xx/pci_ocp.c

@@ -590,7 +590,7 @@ pci_ocp_inbound(struct pci_ocp_softc *sc, int wnd, int tgt, u_long start,
 	KASSERT(wnd > 0, ("%s: inbound window 0 is invalid", __func__));
 
 	switch (tgt) {
-	case OCP85XX_TGTIF_RAM:
+	case OCP85XX_TGTIF_RAM1:
 		attr = 0xa0f55000 | (ffsl(size) - 2);
 		break;
 	default:
@@ -721,7 +721,7 @@ pci_ocp_attach(device_t dev)
 
 	pci_ocp_inbound(sc, 1, -1, 0, 0, 0);
 	pci_ocp_inbound(sc, 2, -1, 0, 0, 0);
-	pci_ocp_inbound(sc, 3, OCP85XX_TGTIF_RAM, 0, 2U*1024U*1024U*1024U, 0);
+	pci_ocp_inbound(sc, 3, OCP85XX_TGTIF_RAM1, 0, 2U*1024U*1024U*1024U, 0);
 
 	maxslot = (sc->sc_pcie) ? 1 : 31;
 	pci_ocp_init(sc, sc->sc_busnr, maxslot);