[PATCH] powerpc: Experimental support for new G5 Macs (#2)

This adds some very basic support for the new machines, including the
Quad G5 (tested), and other new dual core based machines and iMac G5
iSight (untested). This is still experimental !  There is no thermal
control yet, there is no proper handing of MSIs, etc.. but it
boots, I have all 4 cores up on my machine. Compared to the previous
version of this patch, this one adds DART IOMMU support for the U4
chipset and thus should work fine on setups with more than 2Gb of RAM.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 160 insertions, 39 deletions

diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 9513ea78e6c19..4f26304d0263b 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -13,6 +13,9 @@
  */
 
 #undef DEBUG
+#undef DEBUG_IPI
+#undef DEBUG_IRQ
+#undef DEBUG_LOW
 
 #include <linux/config.h>
 #include <linux/types.h>
@@ -168,35 +171,86 @@ static void __init mpic_test_broken_ipi(struct mpic *mpic)
 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
  * to force the edge setting on the MPIC and do the ack workaround.
  */
-static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source_no)
+static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 {
-	if (source_no >= 128 || !mpic->fixups)
+	if (source >= 128 || !mpic->fixups)
 		return 0;
-	return mpic->fixups[source_no].base != NULL;
+	return mpic->fixups[source].base != NULL;
 }
 
 
-static inline void mpic_apic_end_irq(struct mpic *mpic, unsigned int source_no)
+static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
 {
-	struct mpic_irq_fixup *fixup = &mpic->fixups[source_no];
+	struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 
-	spin_lock(&mpic->fixup_lock);
-	writeb(0x11 + 2 * fixup->irq, fixup->base + 2);
-	writel(fixup->data, fixup->base + 4);
-	spin_unlock(&mpic->fixup_lock);
+	if (fixup->applebase) {
+		unsigned int soff = (fixup->index >> 3) & ~3;
+		unsigned int mask = 1U << (fixup->index & 0x1f);
+		writel(mask, fixup->applebase + soff);
+	} else {
+		spin_lock(&mpic->fixup_lock);
+		writeb(0x11 + 2 * fixup->index, fixup->base + 2);
+		writel(fixup->data, fixup->base + 4);
+		spin_unlock(&mpic->fixup_lock);
+	}
 }
 
+static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
+				      unsigned int irqflags)
+{
+	struct mpic_irq_fixup *fixup = &mpic->fixups[source];
+	unsigned long flags;
+	u32 tmp;
+
+	if (fixup->base == NULL)
+		return;
+
+	DBG("startup_ht_interrupt(%u, %u) index: %d\n",
+	    source, irqflags, fixup->index);
+	spin_lock_irqsave(&mpic->fixup_lock, flags);
+	/* Enable and configure */
+	writeb(0x10 + 2 * fixup->index, fixup->base + 2);
+	tmp = readl(fixup->base + 4);
+	tmp &= ~(0x23U);
+	if (irqflags & IRQ_LEVEL)
+		tmp |= 0x22;
+	writel(tmp, fixup->base + 4);
+	spin_unlock_irqrestore(&mpic->fixup_lock, flags);
+}
+
+static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
+				       unsigned int irqflags)
+{
+	struct mpic_irq_fixup *fixup = &mpic->fixups[source];
+	unsigned long flags;
+	u32 tmp;
+
+	if (fixup->base == NULL)
+		return;
+
+	DBG("shutdown_ht_interrupt(%u, %u)\n", source, irqflags);
+
+	/* Disable */
+	spin_lock_irqsave(&mpic->fixup_lock, flags);
+	writeb(0x10 + 2 * fixup->index, fixup->base + 2);
+	tmp = readl(fixup->base + 4);
+	tmp &= ~1U;
+	writel(tmp, fixup->base + 4);
+	spin_unlock_irqrestore(&mpic->fixup_lock, flags);
+}
 
-static void __init mpic_scan_ioapic(struct mpic *mpic, u8 __iomem *devbase)
+static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
+				    unsigned int devfn, u32 vdid)
 {
 	int i, irq, n;
+	u8 __iomem *base;
 	u32 tmp;
 	u8 pos;
 
-	for (pos = readb(devbase + 0x34); pos; pos = readb(devbase + pos + 1)) {
-		u8 id = readb(devbase + pos);
-
-		if (id == 0x08) {
+	for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
+	     pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
+		u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
+		if (id == PCI_CAP_ID_HT_IRQCONF) {
 			id = readb(devbase + pos + 3);
 			if (id == 0x80)
 				break;
@@ -205,33 +259,41 @@ static void __init mpic_scan_ioapic(struct mpic *mpic, u8 __iomem *devbase)
 	if (pos == 0)
 		return;
 
-	printk(KERN_INFO "mpic:    - Workarounds @ %p, pos = 0x%02x\n", devbase, pos);
+	base = devbase + pos;
+	writeb(0x01, base + 2);
+	n = (readl(base + 4) >> 16) & 0xff;
 
-	devbase += pos;
-
-	writeb(0x01, devbase + 2);
-	n = (readl(devbase + 4) >> 16) & 0xff;
+	printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
+	       " has %d irqs\n",
+	       devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
 
 	for (i = 0; i <= n; i++) {
-		writeb(0x10 + 2 * i, devbase + 2);
-		tmp = readl(devbase + 4);
-		if ((tmp & 0x21) != 0x20)
-			continue;
+		writeb(0x10 + 2 * i, base + 2);
+		tmp = readl(base + 4);
 		irq = (tmp >> 16) & 0xff;
-		mpic->fixups[irq].irq = i;
-		mpic->fixups[irq].base = devbase;
-		writeb(0x11 + 2 * i, devbase + 2);
-		mpic->fixups[irq].data = readl(devbase + 4) | 0x80000000;
+		DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
+		/* mask it , will be unmasked later */
+		tmp |= 0x1;
+		writel(tmp, base + 4);
+		mpic->fixups[irq].index = i;
+		mpic->fixups[irq].base = base;
+		/* Apple HT PIC has a non-standard way of doing EOIs */
+		if ((vdid & 0xffff) == 0x106b)
+			mpic->fixups[irq].applebase = devbase + 0x60;
+		else
+			mpic->fixups[irq].applebase = NULL;
+		writeb(0x11 + 2 * i, base + 2);
+		mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
 	}
 }
  
 
-static void __init mpic_scan_ioapics(struct mpic *mpic)
+static void __init mpic_scan_ht_pics(struct mpic *mpic)
 {
 	unsigned int devfn;
 	u8 __iomem *cfgspace;
 
-	printk(KERN_INFO "mpic: Setting up IO-APICs workarounds for U3\n");
+	printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
 
 	/* Allocate fixups array */
 	mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
@@ -247,13 +309,14 @@ static void __init mpic_scan_ioapics(struct mpic *mpic)
 	cfgspace = ioremap(0xf2000000, 0x10000);
 	BUG_ON(cfgspace == NULL);
 
-	/* Now we scan all slots. We do a very quick scan, we read the header type,
-	 * vendor ID and device ID only, that's plenty enough
+	/* Now we scan all slots. We do a very quick scan, we read the header
+	 * type, vendor ID and device ID only, that's plenty enough
 	 */
 	for (devfn = 0; devfn < 0x100; devfn++) {
 		u8 __iomem *devbase = cfgspace + (devfn << 8);
 		u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
 		u32 l = readl(devbase + PCI_VENDOR_ID);
+		u16 s;
 
 		DBG("devfn %x, l: %x\n", devfn, l);
 
@@ -261,8 +324,12 @@ static void __init mpic_scan_ioapics(struct mpic *mpic)
 		if (l == 0xffffffff || l == 0x00000000 ||
 		    l == 0x0000ffff || l == 0xffff0000)
 			goto next;
+		/* Check if is supports capability lists */
+		s = readw(devbase + PCI_STATUS);
+		if (!(s & PCI_STATUS_CAP_LIST))
+			goto next;
 
-		mpic_scan_ioapic(mpic, devbase);
+		mpic_scan_ht_pic(mpic, devbase, devfn, l);
 
 	next:
 		/* next device, if function 0 */
@@ -363,6 +430,31 @@ static void mpic_enable_irq(unsigned int irq)
 			break;
 		}
 	} while(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK);	
+
+#ifdef CONFIG_MPIC_BROKEN_U3
+	if (mpic->flags & MPIC_BROKEN_U3) {
+		unsigned int src = irq - mpic->irq_offset;
+		if (mpic_is_ht_interrupt(mpic, src) &&
+		    (irq_desc[irq].status & IRQ_LEVEL))
+			mpic_ht_end_irq(mpic, src);
+	}
+#endif /* CONFIG_MPIC_BROKEN_U3 */
+}
+
+static unsigned int mpic_startup_irq(unsigned int irq)
+{
+#ifdef CONFIG_MPIC_BROKEN_U3
+	struct mpic *mpic = mpic_from_irq(irq);
+	unsigned int src = irq - mpic->irq_offset;
+
+	if (mpic_is_ht_interrupt(mpic, src))
+		mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
+
+#endif /* CONFIG_MPIC_BROKEN_U3 */
+
+	mpic_enable_irq(irq);
+
+	return 0;
 }
 
 static void mpic_disable_irq(unsigned int irq)
@@ -386,12 +478,27 @@ static void mpic_disable_irq(unsigned int irq)
 	} while(!(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK));
 }
 
+static void mpic_shutdown_irq(unsigned int irq)
+{
+#ifdef CONFIG_MPIC_BROKEN_U3
+	struct mpic *mpic = mpic_from_irq(irq);
+	unsigned int src = irq - mpic->irq_offset;
+
+	if (mpic_is_ht_interrupt(mpic, src))
+		mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
+
+#endif /* CONFIG_MPIC_BROKEN_U3 */
+
+	mpic_disable_irq(irq);
+}
+
 static void mpic_end_irq(unsigned int irq)
 {
 	struct mpic *mpic = mpic_from_irq(irq);
 
+#ifdef DEBUG_IRQ
 	DBG("%s: end_irq: %d\n", mpic->name, irq);
-
+#endif
 	/* We always EOI on end_irq() even for edge interrupts since that
 	 * should only lower the priority, the MPIC should have properly
 	 * latched another edge interrupt coming in anyway
@@ -400,8 +507,9 @@ static void mpic_end_irq(unsigned int irq)
 #ifdef CONFIG_MPIC_BROKEN_U3
 	if (mpic->flags & MPIC_BROKEN_U3) {
 		unsigned int src = irq - mpic->irq_offset;
-		if (mpic_is_ht_interrupt(mpic, src))
-			mpic_apic_end_irq(mpic, src);
+		if (mpic_is_ht_interrupt(mpic, src) &&
+		    (irq_desc[irq].status & IRQ_LEVEL))
+			mpic_ht_end_irq(mpic, src);
 	}
 #endif /* CONFIG_MPIC_BROKEN_U3 */
 
@@ -482,6 +590,8 @@ struct mpic * __init mpic_alloc(unsigned long phys_addr,
 	mpic->name = name;
 
 	mpic->hc_irq.typename = name;
+	mpic->hc_irq.startup = mpic_startup_irq;
+	mpic->hc_irq.shutdown = mpic_shutdown_irq;
 	mpic->hc_irq.enable = mpic_enable_irq;
 	mpic->hc_irq.disable = mpic_disable_irq;
 	mpic->hc_irq.end = mpic_end_irq;
@@ -650,10 +760,10 @@ void __init mpic_init(struct mpic *mpic)
 		mpic->irq_count = mpic->num_sources;
 
 #ifdef CONFIG_MPIC_BROKEN_U3
-	/* Do the ioapic fixups on U3 broken mpic */
+	/* Do the HT PIC fixups on U3 broken mpic */
 	DBG("MPIC flags: %x\n", mpic->flags);
 	if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY))
-		mpic_scan_ioapics(mpic);
+		mpic_scan_ht_pics(mpic);
 #endif /* CONFIG_MPIC_BROKEN_U3 */
 
 	for (i = 0; i < mpic->num_sources; i++) {
@@ -840,7 +950,9 @@ void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
 
 	BUG_ON(mpic == NULL);
 
+#ifdef DEBUG_IPI
 	DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
+#endif
 
 	mpic_cpu_write(MPIC_CPU_IPI_DISPATCH_0 + ipi_no * 0x10,
 		       mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
@@ -851,19 +963,28 @@ int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs)
 	u32 irq;
 
 	irq = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK;
+#ifdef DEBUG_LOW
 	DBG("%s: get_one_irq(): %d\n", mpic->name, irq);
-
+#endif
 	if (mpic->cascade && irq == mpic->cascade_vec) {
+#ifdef DEBUG_LOW
 		DBG("%s: cascading ...\n", mpic->name);
+#endif
 		irq = mpic->cascade(regs, mpic->cascade_data);
 		mpic_eoi(mpic);
 		return irq;
 	}
 	if (unlikely(irq == MPIC_VEC_SPURRIOUS))
 		return -1;
-	if (irq < MPIC_VEC_IPI_0) 
+	if (irq < MPIC_VEC_IPI_0) {
+#ifdef DEBUG_IRQ
+		DBG("%s: irq %d\n", mpic->name, irq + mpic->irq_offset);
+#endif
 		return irq + mpic->irq_offset;
+	}
+#ifdef DEBUG_IPI
        	DBG("%s: ipi %d !\n", mpic->name, irq - MPIC_VEC_IPI_0);
+#endif
 	return irq - MPIC_VEC_IPI_0 + mpic->ipi_offset;
 }