/*
* Cell Internal Interrupt Controller
*
- * Copyright (C) 2006 Benjamin Herrenschmidt (benh@kernel.crashing.org)
- * IBM, Corp.
- *
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
*
* Author: Arnd Bergmann <arndb@de.ibm.com>
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#include <linux/config.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/percpu.h>
#include <linux/types.h>
-#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/ptrace.h>
-#include <asm/machdep.h>
#include "interrupt.h"
-#include "cbe_regs.h"
+
+struct iic_pending_bits {
+ u32 data;
+ u8 flags;
+ u8 class;
+ u8 source;
+ u8 prio;
+};
+
+enum iic_pending_flags {
+ IIC_VALID = 0x80,
+ IIC_IPI = 0x40,
+};
+
+struct iic_regs {
+ struct iic_pending_bits pending;
+ struct iic_pending_bits pending_destr;
+ u64 generate;
+ u64 prio;
+};
struct iic {
- struct cbe_iic_thread_regs __iomem *regs;
+ struct iic_regs __iomem *regs;
u8 target_id;
- u8 eoi_stack[16];
- int eoi_ptr;
- struct irq_host *host;
};
static DEFINE_PER_CPU(struct iic, iic);
-#define IIC_NODE_COUNT 2
-static struct irq_host *iic_hosts[IIC_NODE_COUNT];
-/* Convert between "pending" bits and hw irq number */
-static irq_hw_number_t iic_pending_to_hwnum(struct cbe_iic_pending_bits bits)
+void iic_local_enable(void)
{
- unsigned char unit = bits.source & 0xf;
-
- if (bits.flags & CBE_IIC_IRQ_IPI)
- return IIC_IRQ_IPI0 | (bits.prio >> 4);
- else if (bits.class <= 3)
- return (bits.class << 4) | unit;
- else
- return IIC_IRQ_INVALID;
+ out_be64(&__get_cpu_var(iic).regs->prio, 0xff);
}
-static void iic_mask(unsigned int irq)
+void iic_local_disable(void)
{
+ out_be64(&__get_cpu_var(iic).regs->prio, 0x0);
}
-static void iic_unmask(unsigned int irq)
+static unsigned int iic_startup(unsigned int irq)
{
+ return 0;
}
-static void iic_eoi(unsigned int irq)
+static void iic_enable(unsigned int irq)
{
- struct iic *iic = &__get_cpu_var(iic);
- out_be64(&iic->regs->prio, iic->eoi_stack[--iic->eoi_ptr]);
- BUG_ON(iic->eoi_ptr < 0);
+ iic_local_enable();
}
-static struct irq_chip iic_chip = {
+static void iic_disable(unsigned int irq)
+{
+}
+
+static void iic_end(unsigned int irq)
+{
+ iic_local_enable();
+}
+
+static struct hw_interrupt_type iic_pic = {
.typename = " CELL-IIC ",
- .mask = iic_mask,
- .unmask = iic_unmask,
- .eoi = iic_eoi,
+ .startup = iic_startup,
+ .enable = iic_enable,
+ .disable = iic_disable,
+ .end = iic_end,
};
+static int iic_external_get_irq(struct iic_pending_bits pending)
+{
+ int irq;
+ unsigned char node, unit;
+
+ node = pending.source >> 4;
+ unit = pending.source & 0xf;
+ irq = -1;
+
+ /*
+ * This mapping is specific to the Cell Broadband
+ * Engine. We might need to get the numbers
+ * from the device tree to support future CPUs.
+ */
+ switch (unit) {
+ case 0x00:
+ case 0x0b:
+ /*
+ * One of these units can be connected
+ * to an external interrupt controller.
+ */
+ if (pending.prio > 0x3f ||
+ pending.class != 2)
+ break;
+ irq = IIC_EXT_OFFSET
+ + spider_get_irq(pending.prio + node * IIC_NODE_STRIDE)
+ + node * IIC_NODE_STRIDE;
+ break;
+ case 0x01 ... 0x04:
+ case 0x07 ... 0x0a:
+ /*
+ * These units are connected to the SPEs
+ */
+ if (pending.class > 2)
+ break;
+ irq = IIC_SPE_OFFSET
+ + pending.class * IIC_CLASS_STRIDE
+ + node * IIC_NODE_STRIDE
+ + unit;
+ break;
+ }
+ if (irq == -1)
+ printk(KERN_WARNING "Unexpected interrupt class %02x, "
+ "source %02x, prio %02x, cpu %02x\n", pending.class,
+ pending.source, pending.prio, smp_processor_id());
+ return irq;
+}
+
/* Get an IRQ number from the pending state register of the IIC */
-static unsigned int iic_get_irq(struct pt_regs *regs)
+int iic_get_irq(struct pt_regs *regs)
+{
+ struct iic *iic;
+ int irq;
+ struct iic_pending_bits pending;
+
+ iic = &__get_cpu_var(iic);
+ *(unsigned long *) &pending =
+ in_be64((unsigned long __iomem *) &iic->regs->pending_destr);
+
+ irq = -1;
+ if (pending.flags & IIC_VALID) {
+ if (pending.flags & IIC_IPI) {
+ irq = IIC_IPI_OFFSET + (pending.prio >> 4);
+/*
+ if (irq > 0x80)
+ printk(KERN_WARNING "Unexpected IPI prio %02x"
+ "on CPU %02x\n", pending.prio,
+ smp_processor_id());
+*/
+ } else {
+ irq = iic_external_get_irq(pending);
+ }
+ }
+ return irq;
+}
+
+static int setup_iic(int cpu, struct iic *iic)
{
- struct cbe_iic_pending_bits pending;
- struct iic *iic;
-
- iic = &__get_cpu_var(iic);
- *(unsigned long *) &pending =
- in_be64((unsigned long __iomem *) &iic->regs->pending_destr);
- 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;
+ struct device_node *np;
+ int nodeid = cpu / 2;
+ unsigned long regs;
+
+ for (np = of_find_node_by_type(NULL, "cpu");
+ np;
+ np = of_find_node_by_type(np, "cpu")) {
+ if (nodeid == *(int *)get_property(np, "node-id", NULL))
+ break;
+ }
+
+ if (!np) {
+ printk(KERN_WARNING "IIC: CPU %d not found\n", cpu);
+ iic->regs = NULL;
+ iic->target_id = 0xff;
+ return -ENODEV;
+ }
+
+ regs = *(long *)get_property(np, "iic", NULL);
+
+ /* hack until we have decided on the devtree info */
+ regs += 0x400;
+ if (cpu & 1)
+ regs += 0x20;
+
+ printk(KERN_DEBUG "IIC for CPU %d at %lx\n", cpu, regs);
+ iic->regs = __ioremap(regs, sizeof(struct iic_regs),
+ _PAGE_NO_CACHE);
+ iic->target_id = (nodeid << 4) + ((cpu & 1) ? 0xf : 0xe);
+ return 0;
}
#ifdef CONFIG_SMP
/* 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;
+ return IIC_IPI_OFFSET + 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_NUM_IPIS - 1 - (irq - IIC_IPI_OFFSET);
}
void iic_setup_cpu(void)
}
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];
-}
-EXPORT_SYMBOL_GPL(iic_get_irq_host);
-
-
static irqreturn_t iic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
{
- int ipi = (int)(long)dev_id;
-
- smp_message_recv(ipi, regs);
-
+ smp_message_recv(iic_irq_to_ipi(irq), regs);
return IRQ_HANDLED;
}
static void iic_request_ipi(int ipi, const char *name)
{
- int node, 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);
- }
+ int irq;
+
+ irq = iic_ipi_to_irq(ipi);
+ /* IPIs are marked SA_INTERRUPT as they must run with irqs
+ * disabled */
+ get_irq_desc(irq)->handler = &iic_pic;
+ get_irq_desc(irq)->status |= IRQ_PER_CPU;
+ request_irq(irq, iic_ipi_action, SA_INTERRUPT, name, NULL);
}
void iic_request_IPIs(void)
iic_request_ipi(PPC_MSG_DEBUGGER_BREAK, "IPI-debug");
#endif /* CONFIG_DEBUGGER */
}
-
#endif /* CONFIG_SMP */
-
-static int iic_host_match(struct irq_host *h, struct device_node *node)
-{
- return h->host_data != NULL && node == h->host_data;
-}
-
-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
- set_irq_chip_and_handler(virq, &iic_chip, handle_percpu_irq);
- return 0;
-}
-
-static int iic_host_xlate(struct irq_host *h, struct device_node *ct,
- u32 *intspec, unsigned int intsize,
- 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;
-}
-
-static struct irq_host_ops iic_host_ops = {
- .match = iic_host_match,
- .map = iic_host_map,
- .xlate = iic_host_xlate,
-};
-
-static void __init init_one_iic(unsigned int hw_cpu, unsigned long addr,
- struct irq_host *host)
+static void iic_setup_spe_handlers(void)
{
- /* XXX FIXME: should locate the linux CPU number from the HW cpu
- * number properly. We are lucky for now
- */
- struct iic *iic = &per_cpu(iic, hw_cpu);
-
- iic->regs = ioremap(addr, sizeof(struct cbe_iic_thread_regs));
- BUG_ON(iic->regs == NULL);
-
- iic->target_id = ((hw_cpu & 2) << 3) | ((hw_cpu & 1) ? 0xf : 0xe);
- iic->eoi_stack[0] = 0xff;
- iic->host = host;
- 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);
-}
+ int be, isrc;
-static int __init setup_iic(void)
-{
- struct device_node *dn;
- struct resource r0, r1;
- struct irq_host *host;
- int found = 0;
- u32 *np;
-
- for (dn = NULL;
- (dn = of_find_node_by_name(dn,"interrupt-controller")) != NULL;) {
- if (!device_is_compatible(dn,
- "IBM,CBEA-Internal-Interrupt-Controller"))
- continue;
- np = (u32 *)get_property(dn, "ibm,interrupt-server-ranges",
- NULL);
- if (np == NULL) {
- printk(KERN_WARNING "IIC: CPU association not found\n");
- of_node_put(dn);
- return -ENODEV;
- }
- if (of_address_to_resource(dn, 0, &r0) ||
- of_address_to_resource(dn, 1, &r1)) {
- printk(KERN_WARNING "IIC: Can't resolve addresses\n");
- of_node_put(dn);
- return -ENODEV;
+ /* Assume two threads per BE are present */
+ for (be=0; be < num_present_cpus() / 2; be++) {
+ for (isrc = 0; isrc < IIC_CLASS_STRIDE * 3; isrc++) {
+ int irq = IIC_NODE_STRIDE * be + IIC_SPE_OFFSET + isrc;
+ get_irq_desc(irq)->handler = &iic_pic;
}
- 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);
}
-
- if (found)
- return 0;
- else
- return -ENODEV;
}
-void __init iic_init_IRQ(void)
+void iic_init_IRQ(void)
{
- /* Discover and initialize iics */
- if (setup_iic() < 0)
- panic("IIC: Failed to initialize !\n");
-
- /* Set master interrupt handling function */
- ppc_md.get_irq = iic_get_irq;
-
- /* Enable on current CPU */
- iic_setup_cpu();
+ int cpu, irq_offset;
+ struct iic *iic;
+
+ irq_offset = 0;
+ for_each_cpu(cpu) {
+ iic = &per_cpu(iic, cpu);
+ setup_iic(cpu, iic);
+ if (iic->regs)
+ out_be64(&iic->regs->prio, 0xff);
+ }
+ iic_setup_spe_handlers();
}
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