1 files changed, 426 insertions, 0 deletions

diff --git a/arch/ppc/syslib/mv64360_pic.c b/arch/ppc/syslib/mv64360_pic.c
new file mode 100644
index 000000000000..74d8996418e9
--- /dev/null
+++ b/arch/ppc/syslib/mv64360_pic.c
@@ -0,0 +1,426 @@
+/*
+ * arch/ppc/kernel/mv64360_pic.c
+ *
+ * Interrupt controller support for Marvell's MV64360.
+ *
+ * Author: Rabeeh Khoury <rabeeh@galileo.co.il>
+ * Based on MV64360 PIC written by
+ * Chris Zankel <chris@mvista.com>
+ * Mark A. Greer <mgreer@mvista.com>
+ *
+ * Copyright 2004 MontaVista Software, Inc.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+/*
+ * This file contains the specific functions to support the MV64360
+ * interrupt controller.
+ *
+ * The MV64360 has two main interrupt registers (high and low) that
+ * summarizes the interrupts generated by the units of the MV64360.
+ * Each bit is assigned to an interrupt number, where the low register
+ * are assigned from IRQ0 to IRQ31 and the high cause register
+ * from IRQ32 to IRQ63
+ * The GPP (General Purpose Pins) interrupts are assigned from IRQ64 (GPP0)
+ * to IRQ95 (GPP31).
+ * get_irq() returns the lowest interrupt number that is currently asserted.
+ *
+ * Note:
+ *  - This driver does not initialize the GPP when used as an interrupt
+ *    input.
+ */
+
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/stddef.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/mv64x60.h>
+
+#ifdef CONFIG_IRQ_ALL_CPUS
+#error "The mv64360 does not support distribution of IRQs on all CPUs"
+#endif
+/* ========================== forward declaration ========================== */
+
+static void mv64360_unmask_irq(unsigned int);
+static void mv64360_mask_irq(unsigned int);
+static irqreturn_t mv64360_cpu_error_int_handler(int, void *, struct pt_regs *);
+static irqreturn_t mv64360_sram_error_int_handler(int, void *,
+                                                  struct pt_regs *);
+static irqreturn_t mv64360_pci_error_int_handler(int, void *, struct pt_regs *);
+
+/* ========================== local declarations =========================== */
+
+struct hw_interrupt_type mv64360_pic = {
+        .typename = " mv64360  ",
+        .enable   = mv64360_unmask_irq,
+        .disable  = mv64360_mask_irq,
+        .ack      = mv64360_mask_irq,
+        .end      = mv64360_unmask_irq,
+};
+
+#define CPU_INTR_STR    "mv64360 cpu interface error"
+#define SRAM_INTR_STR   "mv64360 internal sram error"
+#define PCI0_INTR_STR   "mv64360 pci 0 error"
+#define PCI1_INTR_STR   "mv64360 pci 1 error"
+
+static struct mv64x60_handle bh;
+
+u32 mv64360_irq_base = 0;       /* MV64360 handles the next 96 IRQs from here */
+
+/* mv64360_init_irq()
+ *
+ * This function initializes the interrupt controller. It assigns
+ * all interrupts from IRQ0 to IRQ95 to the mv64360 interrupt controller.
+ *
+ * Input Variable(s):
+ *  None.
+ *
+ * Outpu. Variable(s):
+ *  None.
+ *
+ * Returns:
+ *  void
+ *
+ * Note:
+ *  We register all GPP inputs as interrupt source, but disable them.
+ */
+void __init
+mv64360_init_irq(void)
+{
+        int i;
+
+        if (ppc_md.progress)
+                ppc_md.progress("mv64360_init_irq: enter", 0x0);
+
+        bh.v_base = mv64x60_get_bridge_vbase();
+
+        ppc_cached_irq_mask[0] = 0;
+        ppc_cached_irq_mask[1] = 0x0f000000;    /* Enable GPP intrs */
+        ppc_cached_irq_mask[2] = 0;
+
+        /* disable all interrupts and clear current interrupts */
+        mv64x60_write(&bh, MV64x60_GPP_INTR_CAUSE, 0);
+        mv64x60_write(&bh, MV64x60_GPP_INTR_MASK, ppc_cached_irq_mask[2]);
+        mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,ppc_cached_irq_mask[0]);
+        mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,ppc_cached_irq_mask[1]);
+
+        /* All interrupts are level interrupts */
+        for (i = mv64360_irq_base; i < (mv64360_irq_base + 96); i++) {
+                irq_desc[i].status |= IRQ_LEVEL;
+                irq_desc[i].handler = &mv64360_pic;
+        }
+
+        if (ppc_md.progress)
+                ppc_md.progress("mv64360_init_irq: exit", 0x0);
+}
+
+/* mv64360_get_irq()
+ *
+ * This function returns the lowest interrupt number of all interrupts that
+ * are currently asserted.
+ *
+ * Input Variable(s):
+ *  struct pt_regs*     not used
+ *
+ * Output Variable(s):
+ *  None.
+ *
+ * Returns:
+ *  int <interrupt number> or -2 (bogus interrupt)
+ *
+ */
+int
+mv64360_get_irq(struct pt_regs *regs)
+{
+        int irq;
+        int irq_gpp;
+
+#ifdef CONFIG_SMP
+        /*
+         * Second CPU gets only doorbell (message) interrupts.
+         * The doorbell interrupt is BIT28 in the main interrupt low cause reg.
+         */
+        int cpu_nr = smp_processor_id();
+        if (cpu_nr == 1) {
+                if (!(mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_LO) &
+                      (1 << MV64x60_IRQ_DOORBELL)))
+                        return -1;
+                return mv64360_irq_base + MV64x60_IRQ_DOORBELL;
+        }
+#endif
+
+        irq = mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_LO);
+        irq = __ilog2((irq & 0x3dfffffe) & ppc_cached_irq_mask[0]);
+
+        if (irq == -1) {
+                irq = mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_HI);
+                irq = __ilog2((irq & 0x1f0003f7) & ppc_cached_irq_mask[1]);
+
+                if (irq == -1)
+                        irq = -2; /* bogus interrupt, should never happen */
+                else {
+                        if ((irq >= 24) && (irq < MV64x60_IRQ_DOORBELL)) {
+                                irq_gpp = mv64x60_read(&bh,
+                                        MV64x60_GPP_INTR_CAUSE);
+                                irq_gpp = __ilog2(irq_gpp &
+                                        ppc_cached_irq_mask[2]);
+
+                                if (irq_gpp == -1)
+                                        irq = -2;
+                                else {
+                                        irq = irq_gpp + 64;
+                                        mv64x60_write(&bh,
+                                                MV64x60_GPP_INTR_CAUSE,
+                                                ~(1 << (irq - 64)));
+                                }
+                        }
+                        else
+                                irq += 32;
+                }
+        }
+
+        (void)mv64x60_read(&bh, MV64x60_GPP_INTR_CAUSE);
+
+        if (irq < 0)
+                return (irq);
+        else
+                return (mv64360_irq_base + irq);
+}
+
+/* mv64360_unmask_irq()
+ *
+ * This function enables an interrupt.
+ *
+ * Input Variable(s):
+ *  unsigned int        interrupt number (IRQ0...IRQ95).
+ *
+ * Output Variable(s):
+ *  None.
+ *
+ * Returns:
+ *  void
+ */
+static void
+mv64360_unmask_irq(unsigned int irq)
+{
+#ifdef CONFIG_SMP
+        /* second CPU gets only doorbell interrupts */
+        if ((irq - mv64360_irq_base) == MV64x60_IRQ_DOORBELL) {
+                mv64x60_set_bits(&bh, MV64360_IC_CPU1_INTR_MASK_LO,
+                                 (1 << MV64x60_IRQ_DOORBELL));
+                return;
+        }
+#endif
+        irq -= mv64360_irq_base;
+
+        if (irq > 31) {
+                if (irq > 63) /* unmask GPP irq */
+                        mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
+                                ppc_cached_irq_mask[2] |= (1 << (irq - 64)));
+                else /* mask high interrupt register */
+                        mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,
+                                ppc_cached_irq_mask[1] |= (1 << (irq - 32)));
+        }
+        else /* mask low interrupt register */
+                mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,
+                        ppc_cached_irq_mask[0] |= (1 << irq));
+
+        (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
+        return;
+}
+
+/* mv64360_mask_irq()
+ *
+ * This function disables the requested interrupt.
+ *
+ * Input Variable(s):
+ *  unsigned int        interrupt number (IRQ0...IRQ95).
+ *
+ * Output Variable(s):
+ *  None.
+ *
+ * Returns:
+ *  void
+ */
+static void
+mv64360_mask_irq(unsigned int irq)
+{
+#ifdef CONFIG_SMP
+        if ((irq - mv64360_irq_base) == MV64x60_IRQ_DOORBELL) {
+                mv64x60_clr_bits(&bh, MV64360_IC_CPU1_INTR_MASK_LO,
+                                 (1 << MV64x60_IRQ_DOORBELL));
+                return;
+        }
+#endif
+        irq -= mv64360_irq_base;
+
+        if (irq > 31) {
+                if (irq > 63) /* mask GPP irq */
+                        mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
+                                ppc_cached_irq_mask[2] &= ~(1 << (irq - 64)));
+                else /* mask high interrupt register */
+                        mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,
+                                ppc_cached_irq_mask[1] &= ~(1 << (irq - 32)));
+        }
+        else /* mask low interrupt register */
+                mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,
+                        ppc_cached_irq_mask[0] &= ~(1 << irq));
+
+        (void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
+        return;
+}
+
+static irqreturn_t
+mv64360_cpu_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+        printk(KERN_ERR "mv64360_cpu_error_int_handler: %s 0x%08x\n",
+                "Error on CPU interface - Cause regiser",
+                mv64x60_read(&bh, MV64x60_CPU_ERR_CAUSE));
+        printk(KERN_ERR "\tCPU error register dump:\n");
+        printk(KERN_ERR "\tAddress low  0x%08x\n",
+               mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_LO));
+        printk(KERN_ERR "\tAddress high 0x%08x\n",
+               mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_HI));
+        printk(KERN_ERR "\tData low     0x%08x\n",
+               mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_LO));
+        printk(KERN_ERR "\tData high    0x%08x\n",
+               mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_HI));
+        printk(KERN_ERR "\tParity       0x%08x\n",
+               mv64x60_read(&bh, MV64x60_CPU_ERR_PARITY));
+        mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t
+mv64360_sram_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+        printk(KERN_ERR "mv64360_sram_error_int_handler: %s 0x%08x\n",
+                "Error in internal SRAM - Cause register",
+                mv64x60_read(&bh, MV64360_SRAM_ERR_CAUSE));
+        printk(KERN_ERR "\tSRAM error register dump:\n");
+        printk(KERN_ERR "\tAddress Low  0x%08x\n",
+               mv64x60_read(&bh, MV64360_SRAM_ERR_ADDR_LO));
+        printk(KERN_ERR "\tAddress High 0x%08x\n",
+               mv64x60_read(&bh, MV64360_SRAM_ERR_ADDR_HI));
+        printk(KERN_ERR "\tData Low     0x%08x\n",
+               mv64x60_read(&bh, MV64360_SRAM_ERR_DATA_LO));
+        printk(KERN_ERR "\tData High    0x%08x\n",
+               mv64x60_read(&bh, MV64360_SRAM_ERR_DATA_HI));
+        printk(KERN_ERR "\tParity       0x%08x\n",
+                mv64x60_read(&bh, MV64360_SRAM_ERR_PARITY));
+        mv64x60_write(&bh, MV64360_SRAM_ERR_CAUSE, 0);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t
+mv64360_pci_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+        u32 val;
+        unsigned int pci_bus = (unsigned int)dev_id;
+
+        if (pci_bus == 0) {     /* Error on PCI 0 */
+                val = mv64x60_read(&bh, MV64x60_PCI0_ERR_CAUSE);
+                printk(KERN_ERR "%s: Error in PCI %d Interface\n",
+                        "mv64360_pci_error_int_handler", pci_bus);
+                printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
+                printk(KERN_ERR "\tCause register 0x%08x\n", val);
+                printk(KERN_ERR "\tAddress Low    0x%08x\n",
+                       mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_LO));
+                printk(KERN_ERR "\tAddress High   0x%08x\n",
+                       mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_HI));
+                printk(KERN_ERR "\tAttribute      0x%08x\n",
+                       mv64x60_read(&bh, MV64x60_PCI0_ERR_DATA_LO));
+                printk(KERN_ERR "\tCommand        0x%08x\n",
+                       mv64x60_read(&bh, MV64x60_PCI0_ERR_CMD));
+                mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, ~val);
+        }
+        if (pci_bus == 1) {     /* Error on PCI 1 */
+                val = mv64x60_read(&bh, MV64x60_PCI1_ERR_CAUSE);
+                printk(KERN_ERR "%s: Error in PCI %d Interface\n",
+                        "mv64360_pci_error_int_handler", pci_bus);
+                printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
+                printk(KERN_ERR "\tCause register 0x%08x\n", val);
+                printk(KERN_ERR "\tAddress Low    0x%08x\n",
+                       mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_LO));
+                printk(KERN_ERR "\tAddress High   0x%08x\n",
+                       mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_HI));
+                printk(KERN_ERR "\tAttribute      0x%08x\n",
+                       mv64x60_read(&bh, MV64x60_PCI1_ERR_DATA_LO));
+                printk(KERN_ERR "\tCommand        0x%08x\n",
+                       mv64x60_read(&bh, MV64x60_PCI1_ERR_CMD));
+                mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, ~val);
+        }
+        return IRQ_HANDLED;
+}
+
+static int __init
+mv64360_register_hdlrs(void)
+{
+        u32     mask;
+        int     rc;
+
+        /* Clear old errors and register CPU interface error intr handler */
+        mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0);
+        if ((rc = request_irq(MV64x60_IRQ_CPU_ERR + mv64360_irq_base,
+                mv64360_cpu_error_int_handler, SA_INTERRUPT, CPU_INTR_STR, 0)))
+                printk(KERN_WARNING "Can't register cpu error handler: %d", rc);
+
+        mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0);
+        mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0x000000ff);
+
+        /* Clear old errors and register internal SRAM error intr handler */
+        mv64x60_write(&bh, MV64360_SRAM_ERR_CAUSE, 0);
+        if ((rc = request_irq(MV64360_IRQ_SRAM_PAR_ERR + mv64360_irq_base,
+                mv64360_sram_error_int_handler,SA_INTERRUPT,SRAM_INTR_STR, 0)))
+                printk(KERN_WARNING "Can't register SRAM error handler: %d",rc);
+
+        /*
+         * Bit 0 reserved on 64360 and erratum FEr PCI-#11 (PCI internal
+         * data parity error set incorrectly) on rev 0 & 1 of 64460 requires
+         * bit 0 to be cleared.
+         */
+        mask = 0x00a50c24;
+
+        if ((mv64x60_get_bridge_type() == MV64x60_TYPE_MV64460) &&
+                (mv64x60_get_bridge_rev() > 1))
+                mask |= 0x1;    /* enable DPErr on 64460 */
+
+        /* Clear old errors and register PCI 0 error intr handler */
+        mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, 0);
+        if ((rc = request_irq(MV64360_IRQ_PCI0 + mv64360_irq_base,
+                        mv64360_pci_error_int_handler,
+                        SA_INTERRUPT, PCI0_INTR_STR, (void *)0)))
+                printk(KERN_WARNING "Can't register pci 0 error handler: %d",
+                        rc);
+
+        mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, 0);
+        mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, mask);
+
+        /* Clear old errors and register PCI 1 error intr handler */
+        mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, 0);
+        if ((rc = request_irq(MV64360_IRQ_PCI1 + mv64360_irq_base,
+                        mv64360_pci_error_int_handler,
+                        SA_INTERRUPT, PCI1_INTR_STR, (void *)1)))
+                printk(KERN_WARNING "Can't register pci 1 error handler: %d",
+                        rc);
+
+        mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, 0);
+        mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, mask);
+
+        return 0;
+}
+
+arch_initcall(mv64360_register_hdlrs);