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-rw-r--r--arch/mips/mips-boards/malta/malta_int.c346
1 files changed, 346 insertions, 0 deletions
diff --git a/arch/mips/mips-boards/malta/malta_int.c b/arch/mips/mips-boards/malta/malta_int.c
index dbe60eb55e2..e1744ae855c 100644
--- a/arch/mips/mips-boards/malta/malta_int.c
+++ b/arch/mips/mips-boards/malta/malta_int.c
@@ -31,6 +31,7 @@
#include <linux/kernel.h>
#include <linux/random.h>
+#include <asm/traps.h>
#include <asm/i8259.h>
#include <asm/irq_cpu.h>
#include <asm/irq_regs.h>
@@ -41,6 +42,14 @@
#include <asm/mips-boards/generic.h>
#include <asm/mips-boards/msc01_pci.h>
#include <asm/msc01_ic.h>
+#include <asm/gic.h>
+#include <asm/gcmpregs.h>
+
+int gcmp_present = -1;
+int gic_present;
+static unsigned long _msc01_biu_base;
+static unsigned long _gcmp_base;
+static unsigned int ipi_map[NR_CPUS];
static DEFINE_SPINLOCK(mips_irq_lock);
@@ -121,6 +130,17 @@ static void malta_hw0_irqdispatch(void)
do_IRQ(MALTA_INT_BASE + irq);
}
+static void malta_ipi_irqdispatch(void)
+{
+ int irq;
+
+ irq = gic_get_int();
+ if (irq < 0)
+ return; /* interrupt has already been cleared */
+
+ do_IRQ(MIPS_GIC_IRQ_BASE + irq);
+}
+
static void corehi_irqdispatch(void)
{
unsigned int intedge, intsteer, pcicmd, pcibadaddr;
@@ -257,12 +277,61 @@ asmlinkage void plat_irq_dispatch(void)
if (irq == MIPSCPU_INT_I8259A)
malta_hw0_irqdispatch();
+ else if (gic_present && ((1 << irq) & ipi_map[smp_processor_id()]))
+ malta_ipi_irqdispatch();
else if (irq >= 0)
do_IRQ(MIPS_CPU_IRQ_BASE + irq);
else
spurious_interrupt();
}
+#ifdef CONFIG_MIPS_MT_SMP
+
+
+#define GIC_MIPS_CPU_IPI_RESCHED_IRQ 3
+#define GIC_MIPS_CPU_IPI_CALL_IRQ 4
+
+#define MIPS_CPU_IPI_RESCHED_IRQ 0 /* SW int 0 for resched */
+#define C_RESCHED C_SW0
+#define MIPS_CPU_IPI_CALL_IRQ 1 /* SW int 1 for resched */
+#define C_CALL C_SW1
+static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
+
+static void ipi_resched_dispatch(void)
+{
+ do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
+}
+
+static void ipi_call_dispatch(void)
+{
+ do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
+}
+
+static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
+{
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
+{
+ smp_call_function_interrupt();
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction irq_resched = {
+ .handler = ipi_resched_interrupt,
+ .flags = IRQF_DISABLED|IRQF_PERCPU,
+ .name = "IPI_resched"
+};
+
+static struct irqaction irq_call = {
+ .handler = ipi_call_interrupt,
+ .flags = IRQF_DISABLED|IRQF_PERCPU,
+ .name = "IPI_call"
+};
+#endif /* CONFIG_MIPS_MT_SMP */
+
static struct irqaction i8259irq = {
.handler = no_action,
.name = "XT-PIC cascade"
@@ -291,15 +360,90 @@ msc_irqmap_t __initdata msc_eicirqmap[] = {
{MSC01E_INT_PERFCTR, MSC01_IRQ_LEVEL, 0},
{MSC01E_INT_CPUCTR, MSC01_IRQ_LEVEL, 0}
};
+
int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap);
+/*
+ * This GIC specific tabular array defines the association between External
+ * Interrupts and CPUs/Core Interrupts. The nature of the External
+ * Interrupts is also defined here - polarity/trigger.
+ */
+static struct gic_intr_map gic_intr_map[] = {
+ { GIC_EXT_INTR(0), X, X, X, X, 0 },
+ { GIC_EXT_INTR(1), X, X, X, X, 0 },
+ { GIC_EXT_INTR(2), X, X, X, X, 0 },
+ { GIC_EXT_INTR(3), 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, 0 },
+ { GIC_EXT_INTR(4), 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_LEVEL, 0 },
+ { GIC_EXT_INTR(5), 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, 0 },
+ { GIC_EXT_INTR(6), 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, 0 },
+ { GIC_EXT_INTR(7), 0, GIC_CPU_INT4, GIC_POL_POS, GIC_TRIG_LEVEL, 0 },
+ { GIC_EXT_INTR(8), 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, 0 },
+ { GIC_EXT_INTR(9), 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, 0 },
+ { GIC_EXT_INTR(10), X, X, X, X, 0 },
+ { GIC_EXT_INTR(11), X, X, X, X, 0 },
+ { GIC_EXT_INTR(12), 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, 0 },
+ { GIC_EXT_INTR(13), 0, GIC_MAP_TO_NMI_MSK, GIC_POL_POS, GIC_TRIG_LEVEL, 0 },
+ { GIC_EXT_INTR(14), 0, GIC_MAP_TO_NMI_MSK, GIC_POL_POS, GIC_TRIG_LEVEL, 0 },
+ { GIC_EXT_INTR(15), X, X, X, X, 0 },
+ { GIC_EXT_INTR(16), 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_EDGE, 1 },
+ { GIC_EXT_INTR(17), 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_EDGE, 1 },
+ { GIC_EXT_INTR(18), 1, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_EDGE, 1 },
+ { GIC_EXT_INTR(19), 1, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_EDGE, 1 },
+ { GIC_EXT_INTR(20), 2, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_EDGE, 1 },
+ { GIC_EXT_INTR(21), 2, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_EDGE, 1 },
+ { GIC_EXT_INTR(22), 3, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_EDGE, 1 },
+ { GIC_EXT_INTR(23), 3, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_EDGE, 1 },
+};
+
+/*
+ * GCMP needs to be detected before any SMP initialisation
+ */
+int __init gcmp_probe(unsigned long addr, unsigned long size)
+{
+ if (gcmp_present >= 0)
+ return gcmp_present;
+
+ _gcmp_base = (unsigned long) ioremap_nocache(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ);
+ _msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
+ gcmp_present = (GCMPGCB(GCMPB) & GCMP_GCB_GCMPB_GCMPBASE_MSK) == GCMP_BASE_ADDR;
+
+ if (gcmp_present)
+ printk(KERN_DEBUG "GCMP present\n");
+ return gcmp_present;
+}
+
+void __init fill_ipi_map(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(gic_intr_map); i++) {
+ if (gic_intr_map[i].ipiflag && (gic_intr_map[i].cpunum != X))
+ ipi_map[gic_intr_map[i].cpunum] |=
+ (1 << (gic_intr_map[i].pin + 2));
+ }
+}
+
void __init arch_init_irq(void)
{
+ int gic_present, gcmp_present;
+
init_i8259_irqs();
if (!cpu_has_veic)
mips_cpu_irq_init();
+ gcmp_present = gcmp_probe(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ);
+ if (gcmp_present) {
+ GCMPGCB(GICBA) = GIC_BASE_ADDR | GCMP_GCB_GICBA_EN_MSK;
+ gic_present = 1;
+ } else {
+ _msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
+ gic_present = (REG(_msc01_biu_base, MSC01_SC_CFG) &
+ MSC01_SC_CFG_GICPRES_MSK) >> MSC01_SC_CFG_GICPRES_SHF;
+ }
+ if (gic_present)
+ printk(KERN_DEBUG "GIC present\n");
+
switch (mips_revision_sconid) {
case MIPS_REVISION_SCON_SOCIT:
case MIPS_REVISION_SCON_ROCIT:
@@ -360,4 +504,206 @@ void __init arch_init_irq(void)
setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
&corehi_irqaction);
}
+
+#if defined(CONFIG_MIPS_MT_SMP)
+ if (gic_present) {
+ /* FIXME */
+ int i;
+ struct {
+ unsigned int resched;
+ unsigned int call;
+ } ipiirq[] = {
+ {
+ .resched = GIC_IPI_EXT_INTR_RESCHED_VPE0,
+ .call = GIC_IPI_EXT_INTR_CALLFNC_VPE0},
+ {
+ .resched = GIC_IPI_EXT_INTR_RESCHED_VPE1,
+ .call = GIC_IPI_EXT_INTR_CALLFNC_VPE1
+ }, {
+ .resched = GIC_IPI_EXT_INTR_RESCHED_VPE2,
+ .call = GIC_IPI_EXT_INTR_CALLFNC_VPE2
+ }, {
+ .resched = GIC_IPI_EXT_INTR_RESCHED_VPE3,
+ .call = GIC_IPI_EXT_INTR_CALLFNC_VPE3
+ }
+ };
+#define NIPI (sizeof(ipiirq)/sizeof(ipiirq[0]))
+ fill_ipi_map();
+ gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map, ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);
+ if (!gcmp_present) {
+ /* Enable the GIC */
+ i = REG(_msc01_biu_base, MSC01_SC_CFG);
+ REG(_msc01_biu_base, MSC01_SC_CFG) =
+ (i | (0x1 << MSC01_SC_CFG_GICENA_SHF));
+ pr_debug("GIC Enabled\n");
+ }
+
+ /* set up ipi interrupts */
+ if (cpu_has_vint) {
+ set_vi_handler(MIPSCPU_INT_IPI0, malta_ipi_irqdispatch);
+ set_vi_handler(MIPSCPU_INT_IPI1, malta_ipi_irqdispatch);
+ }
+ /* Argh.. this really needs sorting out.. */
+ printk("CPU%d: status register was %08x\n", smp_processor_id(), read_c0_status());
+ write_c0_status(read_c0_status() | STATUSF_IP3 | STATUSF_IP4);
+ printk("CPU%d: status register now %08x\n", smp_processor_id(), read_c0_status());
+ write_c0_status(0x1100dc00);
+ printk("CPU%d: status register frc %08x\n", smp_processor_id(), read_c0_status());
+ for (i = 0; i < NIPI; i++) {
+ setup_irq(MIPS_GIC_IRQ_BASE + ipiirq[i].resched, &irq_resched);
+ setup_irq(MIPS_GIC_IRQ_BASE + ipiirq[i].call, &irq_call);
+
+ set_irq_handler(MIPS_GIC_IRQ_BASE + ipiirq[i].resched, handle_percpu_irq);
+ set_irq_handler(MIPS_GIC_IRQ_BASE + ipiirq[i].call, handle_percpu_irq);
+ }
+ } else {
+ /* set up ipi interrupts */
+ if (cpu_has_veic) {
+ set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch);
+ set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch);
+ cpu_ipi_resched_irq = MSC01E_INT_SW0;
+ cpu_ipi_call_irq = MSC01E_INT_SW1;
+ } else {
+ if (cpu_has_vint) {
+ set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
+ set_vi_handler (MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
+ }
+ cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ;
+ cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ;
+ }
+
+ setup_irq(cpu_ipi_resched_irq, &irq_resched);
+ setup_irq(cpu_ipi_call_irq, &irq_call);
+
+ set_irq_handler(cpu_ipi_resched_irq, handle_percpu_irq);
+ set_irq_handler(cpu_ipi_call_irq, handle_percpu_irq);
+ }
+#endif
+}
+
+void malta_be_init(void)
+{
+ if (gcmp_present) {
+ /* Could change CM error mask register */
+ }
+}
+
+
+static char *tr[8] = {
+ "mem", "gcr", "gic", "mmio",
+ "0x04", "0x05", "0x06", "0x07"
+};
+
+static char *mcmd[32] = {
+ [0x00] = "0x00",
+ [0x01] = "Legacy Write",
+ [0x02] = "Legacy Read",
+ [0x03] = "0x03",
+ [0x04] = "0x04",
+ [0x05] = "0x05",
+ [0x06] = "0x06",
+ [0x07] = "0x07",
+ [0x08] = "Coherent Read Own",
+ [0x09] = "Coherent Read Share",
+ [0x0a] = "Coherent Read Discard",
+ [0x0b] = "Coherent Ready Share Always",
+ [0x0c] = "Coherent Upgrade",
+ [0x0d] = "Coherent Writeback",
+ [0x0e] = "0x0e",
+ [0x0f] = "0x0f",
+ [0x10] = "Coherent Copyback",
+ [0x11] = "Coherent Copyback Invalidate",
+ [0x12] = "Coherent Invalidate",
+ [0x13] = "Coherent Write Invalidate",
+ [0x14] = "Coherent Completion Sync",
+ [0x15] = "0x15",
+ [0x16] = "0x16",
+ [0x17] = "0x17",
+ [0x18] = "0x18",
+ [0x19] = "0x19",
+ [0x1a] = "0x1a",
+ [0x1b] = "0x1b",
+ [0x1c] = "0x1c",
+ [0x1d] = "0x1d",
+ [0x1e] = "0x1e",
+ [0x1f] = "0x1f"
+};
+
+static char *core[8] = {
+ "Invalid/OK", "Invalid/Data",
+ "Shared/OK", "Shared/Data",
+ "Modified/OK", "Modified/Data",
+ "Exclusive/OK", "Exclusive/Data"
+};
+
+static char *causes[32] = {
+ "None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR",
+ "COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07",
+ "0x08", "0x09", "0x0a", "0x0b",
+ "0x0c", "0x0d", "0x0e", "0x0f",
+ "0x10", "0x11", "0x12", "0x13",
+ "0x14", "0x15", "0x16", "INTVN_WR_ERR",
+ "INTVN_RD_ERR", "0x19", "0x1a", "0x1b",
+ "0x1c", "0x1d", "0x1e", "0x1f"
+};
+
+int malta_be_handler(struct pt_regs *regs, int is_fixup)
+{
+ /* This duplicates the handling in do_be which seems wrong */
+ int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
+
+ if (gcmp_present) {
+ unsigned long cm_error = GCMPGCB(GCMEC);
+ unsigned long cm_addr = GCMPGCB(GCMEA);
+ unsigned long cm_other = GCMPGCB(GCMEO);
+ unsigned long cause, ocause;
+ char buf[256];
+
+ cause = (cm_error & GCMP_GCB_GMEC_ERROR_TYPE_MSK);
+ if (cause != 0) {
+ cause >>= GCMP_GCB_GMEC_ERROR_TYPE_SHF;
+ if (cause < 16) {
+ unsigned long cca_bits = (cm_error >> 15) & 7;
+ unsigned long tr_bits = (cm_error >> 12) & 7;
+ unsigned long mcmd_bits = (cm_error >> 7) & 0x1f;
+ unsigned long stag_bits = (cm_error >> 3) & 15;
+ unsigned long sport_bits = (cm_error >> 0) & 7;
+
+ snprintf(buf, sizeof(buf),
+ "CCA=%lu TR=%s MCmd=%s STag=%lu "
+ "SPort=%lu\n",
+ cca_bits, tr[tr_bits], mcmd[mcmd_bits],
+ stag_bits, sport_bits);
+ } else {
+ /* glob state & sresp together */
+ unsigned long c3_bits = (cm_error >> 18) & 7;
+ unsigned long c2_bits = (cm_error >> 15) & 7;
+ unsigned long c1_bits = (cm_error >> 12) & 7;
+ unsigned long c0_bits = (cm_error >> 9) & 7;
+ unsigned long sc_bit = (cm_error >> 8) & 1;
+ unsigned long mcmd_bits = (cm_error >> 3) & 0x1f;
+ unsigned long sport_bits = (cm_error >> 0) & 7;
+ snprintf(buf, sizeof(buf),
+ "C3=%s C2=%s C1=%s C0=%s SC=%s "
+ "MCmd=%s SPort=%lu\n",
+ core[c3_bits], core[c2_bits],
+ core[c1_bits], core[c0_bits],
+ sc_bit ? "True" : "False",
+ mcmd[mcmd_bits], sport_bits);
+ }
+
+ ocause = (cm_other & GCMP_GCB_GMEO_ERROR_2ND_MSK) >>
+ GCMP_GCB_GMEO_ERROR_2ND_SHF;
+
+ printk("CM_ERROR=%08lx %s <%s>\n", cm_error,
+ causes[cause], buf);
+ printk("CM_ADDR =%08lx\n", cm_addr);
+ printk("CM_OTHER=%08lx %s\n", cm_other, causes[ocause]);
+
+ /* reprime cause register */
+ GCMPGCB(GCMEC) = 0;
+ }
+ }
+
+ return retval;
}
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