aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/cell/interrupt.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/platforms/cell/interrupt.c')
-rw-r--r--arch/powerpc/platforms/cell/interrupt.c235
1 files changed, 163 insertions, 72 deletions
diff --git a/arch/powerpc/platforms/cell/interrupt.c b/arch/powerpc/platforms/cell/interrupt.c
index 6b57a47c5d37..6cc59e0b4582 100644
--- a/arch/powerpc/platforms/cell/interrupt.c
+++ b/arch/powerpc/platforms/cell/interrupt.c
@@ -21,6 +21,12 @@
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * TODO:
+ * - Fix various assumptions related to HW CPU numbers vs. linux CPU numbers
+ * vs node numbers in the setup code
+ * - Implement proper handling of maxcpus=1/2 (that is, routing of irqs from
+ * a non-active node to the active node)
*/
#include <linux/interrupt.h>
@@ -44,24 +50,25 @@ struct iic {
u8 target_id;
u8 eoi_stack[16];
int eoi_ptr;
- struct irq_host *host;
+ struct device_node *node;
};
static DEFINE_PER_CPU(struct iic, iic);
#define IIC_NODE_COUNT 2
-static struct irq_host *iic_hosts[IIC_NODE_COUNT];
+static struct irq_host *iic_host;
/* Convert between "pending" bits and hw irq number */
static irq_hw_number_t iic_pending_to_hwnum(struct cbe_iic_pending_bits bits)
{
unsigned char unit = bits.source & 0xf;
+ unsigned char node = bits.source >> 4;
+ unsigned char class = bits.class & 3;
+ /* Decode IPIs */
if (bits.flags & CBE_IIC_IRQ_IPI)
- return IIC_IRQ_IPI0 | (bits.prio >> 4);
- else if (bits.class <= 3)
- return (bits.class << 4) | unit;
+ return IIC_IRQ_TYPE_IPI | (bits.prio >> 4);
else
- return IIC_IRQ_INVALID;
+ return (node << IIC_IRQ_NODE_SHIFT) | (class << 4) | unit;
}
static void iic_mask(unsigned int irq)
@@ -86,21 +93,70 @@ static struct irq_chip iic_chip = {
.eoi = iic_eoi,
};
+
+static void iic_ioexc_eoi(unsigned int irq)
+{
+}
+
+static void iic_ioexc_cascade(unsigned int irq, struct irq_desc *desc,
+ struct pt_regs *regs)
+{
+ struct cbe_iic_regs *node_iic = desc->handler_data;
+ unsigned int base = (irq & 0xffffff00) | IIC_IRQ_TYPE_IOEXC;
+ unsigned long bits, ack;
+ int cascade;
+
+ for (;;) {
+ bits = in_be64(&node_iic->iic_is);
+ if (bits == 0)
+ break;
+ /* pre-ack edge interrupts */
+ ack = bits & IIC_ISR_EDGE_MASK;
+ if (ack)
+ out_be64(&node_iic->iic_is, ack);
+ /* handle them */
+ for (cascade = 63; cascade >= 0; cascade--)
+ if (bits & (0x8000000000000000UL >> cascade)) {
+ unsigned int cirq =
+ irq_linear_revmap(iic_host,
+ base | cascade);
+ if (cirq != NO_IRQ)
+ generic_handle_irq(cirq, regs);
+ }
+ /* post-ack level interrupts */
+ ack = bits & ~IIC_ISR_EDGE_MASK;
+ if (ack)
+ out_be64(&node_iic->iic_is, ack);
+ }
+ desc->chip->eoi(irq);
+}
+
+
+static struct irq_chip iic_ioexc_chip = {
+ .typename = " CELL-IOEX",
+ .mask = iic_mask,
+ .unmask = iic_unmask,
+ .eoi = iic_ioexc_eoi,
+};
+
/* Get an IRQ number from the pending state register of the IIC */
static unsigned int iic_get_irq(struct pt_regs *regs)
{
struct cbe_iic_pending_bits pending;
struct iic *iic;
+ unsigned int virq;
iic = &__get_cpu_var(iic);
*(unsigned long *) &pending =
in_be64((unsigned long __iomem *) &iic->regs->pending_destr);
+ if (!(pending.flags & CBE_IIC_IRQ_VALID))
+ return NO_IRQ;
+ virq = irq_linear_revmap(iic_host, iic_pending_to_hwnum(pending));
+ if (virq == NO_IRQ)
+ return NO_IRQ;
iic->eoi_stack[++iic->eoi_ptr] = pending.prio;
BUG_ON(iic->eoi_ptr > 15);
- if (pending.flags & CBE_IIC_IRQ_VALID)
- return irq_linear_revmap(iic->host,
- iic_pending_to_hwnum(pending));
- return NO_IRQ;
+ return virq;
}
#ifdef CONFIG_SMP
@@ -108,12 +164,7 @@ static unsigned int iic_get_irq(struct pt_regs *regs)
/* Use the highest interrupt priorities for IPI */
static inline int iic_ipi_to_irq(int ipi)
{
- return IIC_IRQ_IPI0 + IIC_NUM_IPIS - 1 - ipi;
-}
-
-static inline int iic_irq_to_ipi(int irq)
-{
- return IIC_NUM_IPIS - 1 - (irq - IIC_IRQ_IPI0);
+ return IIC_IRQ_TYPE_IPI + 0xf - ipi;
}
void iic_setup_cpu(void)
@@ -123,7 +174,7 @@ void iic_setup_cpu(void)
void iic_cause_IPI(int cpu, int mesg)
{
- out_be64(&per_cpu(iic, cpu).regs->generate, (IIC_NUM_IPIS - 1 - mesg) << 4);
+ out_be64(&per_cpu(iic, cpu).regs->generate, (0xf - mesg) << 4);
}
u8 iic_get_target_id(int cpu)
@@ -134,9 +185,7 @@ EXPORT_SYMBOL_GPL(iic_get_target_id);
struct irq_host *iic_get_irq_host(int node)
{
- if (node < 0 || node >= IIC_NODE_COUNT)
- return NULL;
- return iic_hosts[node];
+ return iic_host;
}
EXPORT_SYMBOL_GPL(iic_get_irq_host);
@@ -149,34 +198,20 @@ static irqreturn_t iic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
return IRQ_HANDLED;
}
-
static void iic_request_ipi(int ipi, const char *name)
{
- int node, virq;
+ int virq;
- for (node = 0; node < IIC_NODE_COUNT; node++) {
- char *rname;
- if (iic_hosts[node] == NULL)
- continue;
- virq = irq_create_mapping(iic_hosts[node],
- iic_ipi_to_irq(ipi));
- if (virq == NO_IRQ) {
- printk(KERN_ERR
- "iic: failed to map IPI %s on node %d\n",
- name, node);
- continue;
- }
- rname = kzalloc(strlen(name) + 16, GFP_KERNEL);
- if (rname)
- sprintf(rname, "%s node %d", name, node);
- else
- rname = (char *)name;
- if (request_irq(virq, iic_ipi_action, IRQF_DISABLED,
- rname, (void *)(long)ipi))
- printk(KERN_ERR
- "iic: failed to request IPI %s on node %d\n",
- name, node);
+ virq = irq_create_mapping(iic_host, iic_ipi_to_irq(ipi));
+ if (virq == NO_IRQ) {
+ printk(KERN_ERR
+ "iic: failed to map IPI %s\n", name);
+ return;
}
+ if (request_irq(virq, iic_ipi_action, IRQF_DISABLED, name,
+ (void *)(long)ipi))
+ printk(KERN_ERR
+ "iic: failed to request IPI %s\n", name);
}
void iic_request_IPIs(void)
@@ -193,16 +228,24 @@ void iic_request_IPIs(void)
static int iic_host_match(struct irq_host *h, struct device_node *node)
{
- return h->host_data != NULL && node == h->host_data;
+ return device_is_compatible(node,
+ "IBM,CBEA-Internal-Interrupt-Controller");
}
static int iic_host_map(struct irq_host *h, unsigned int virq,
irq_hw_number_t hw)
{
- if (hw < IIC_IRQ_IPI0)
- set_irq_chip_and_handler(virq, &iic_chip, handle_fasteoi_irq);
- else
+ switch (hw & IIC_IRQ_TYPE_MASK) {
+ case IIC_IRQ_TYPE_IPI:
set_irq_chip_and_handler(virq, &iic_chip, handle_percpu_irq);
+ break;
+ case IIC_IRQ_TYPE_IOEXC:
+ set_irq_chip_and_handler(virq, &iic_ioexc_chip,
+ handle_fasteoi_irq);
+ break;
+ default:
+ set_irq_chip_and_handler(virq, &iic_chip, handle_fasteoi_irq);
+ }
return 0;
}
@@ -211,11 +254,39 @@ static int iic_host_xlate(struct irq_host *h, struct device_node *ct,
irq_hw_number_t *out_hwirq, unsigned int *out_flags)
{
- /* Currently, we don't translate anything. That needs to be fixed as
- * we get better defined device-trees. iic interrupts have to be
- * explicitely mapped by whoever needs them
- */
- return -ENODEV;
+ unsigned int node, ext, unit, class;
+ const u32 *val;
+
+ if (!device_is_compatible(ct,
+ "IBM,CBEA-Internal-Interrupt-Controller"))
+ return -ENODEV;
+ if (intsize != 1)
+ return -ENODEV;
+ val = get_property(ct, "#interrupt-cells", NULL);
+ if (val == NULL || *val != 1)
+ return -ENODEV;
+
+ node = intspec[0] >> 24;
+ ext = (intspec[0] >> 16) & 0xff;
+ class = (intspec[0] >> 8) & 0xff;
+ unit = intspec[0] & 0xff;
+
+ /* Check if node is in supported range */
+ if (node > 1)
+ return -EINVAL;
+
+ /* Build up interrupt number, special case for IO exceptions */
+ *out_hwirq = (node << IIC_IRQ_NODE_SHIFT);
+ if (unit == IIC_UNIT_IIC && class == 1)
+ *out_hwirq |= IIC_IRQ_TYPE_IOEXC | ext;
+ else
+ *out_hwirq |= IIC_IRQ_TYPE_NORMAL |
+ (class << IIC_IRQ_CLASS_SHIFT) | unit;
+
+ /* Dummy flags, ignored by iic code */
+ *out_flags = IRQ_TYPE_EDGE_RISING;
+
+ return 0;
}
static struct irq_host_ops iic_host_ops = {
@@ -225,7 +296,7 @@ static struct irq_host_ops iic_host_ops = {
};
static void __init init_one_iic(unsigned int hw_cpu, unsigned long addr,
- struct irq_host *host)
+ struct device_node *node)
{
/* XXX FIXME: should locate the linux CPU number from the HW cpu
* number properly. We are lucky for now
@@ -237,19 +308,19 @@ static void __init init_one_iic(unsigned int hw_cpu, unsigned long addr,
iic->target_id = ((hw_cpu & 2) << 3) | ((hw_cpu & 1) ? 0xf : 0xe);
iic->eoi_stack[0] = 0xff;
- iic->host = host;
+ iic->node = of_node_get(node);
out_be64(&iic->regs->prio, 0);
- printk(KERN_INFO "IIC for CPU %d at %lx mapped to %p, target id 0x%x\n",
- hw_cpu, addr, iic->regs, iic->target_id);
+ printk(KERN_INFO "IIC for CPU %d target id 0x%x : %s\n",
+ hw_cpu, iic->target_id, node->full_name);
}
static int __init setup_iic(void)
{
struct device_node *dn;
struct resource r0, r1;
- struct irq_host *host;
- int found = 0;
+ unsigned int node, cascade, found = 0;
+ struct cbe_iic_regs *node_iic;
const u32 *np;
for (dn = NULL;
@@ -269,19 +340,33 @@ static int __init setup_iic(void)
of_node_put(dn);
return -ENODEV;
}
- host = NULL;
- if (found < IIC_NODE_COUNT) {
- host = irq_alloc_host(IRQ_HOST_MAP_LINEAR,
- IIC_SOURCE_COUNT,
- &iic_host_ops,
- IIC_IRQ_INVALID);
- iic_hosts[found] = host;
- BUG_ON(iic_hosts[found] == NULL);
- iic_hosts[found]->host_data = of_node_get(dn);
- found++;
- }
- init_one_iic(np[0], r0.start, host);
- init_one_iic(np[1], r1.start, host);
+ found++;
+ init_one_iic(np[0], r0.start, dn);
+ init_one_iic(np[1], r1.start, dn);
+
+ /* Setup cascade for IO exceptions. XXX cleanup tricks to get
+ * node vs CPU etc...
+ * Note that we configure the IIC_IRR here with a hard coded
+ * priority of 1. We might want to improve that later.
+ */
+ node = np[0] >> 1;
+ node_iic = cbe_get_cpu_iic_regs(np[0]);
+ cascade = node << IIC_IRQ_NODE_SHIFT;
+ cascade |= 1 << IIC_IRQ_CLASS_SHIFT;
+ cascade |= IIC_UNIT_IIC;
+ cascade = irq_create_mapping(iic_host, cascade);
+ if (cascade == NO_IRQ)
+ continue;
+ set_irq_data(cascade, node_iic);
+ set_irq_chained_handler(cascade , iic_ioexc_cascade);
+ out_be64(&node_iic->iic_ir,
+ (1 << 12) /* priority */ |
+ (node << 4) /* dest node */ |
+ IIC_UNIT_THREAD_0 /* route them to thread 0 */);
+ /* Flush pending (make sure it triggers if there is
+ * anything pending
+ */
+ out_be64(&node_iic->iic_is, 0xfffffffffffffffful);
}
if (found)
@@ -292,6 +377,12 @@ static int __init setup_iic(void)
void __init iic_init_IRQ(void)
{
+ /* Setup an irq host data structure */
+ iic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, IIC_SOURCE_COUNT,
+ &iic_host_ops, IIC_IRQ_INVALID);
+ BUG_ON(iic_host == NULL);
+ irq_set_default_host(iic_host);
+
/* Discover and initialize iics */
if (setup_iic() < 0)
panic("IIC: Failed to initialize !\n");

Privacy Policy