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-rw-r--r--arch/powerpc/platforms/powermac/pic.c650
1 files changed, 650 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powermac/pic.c b/arch/powerpc/platforms/powermac/pic.c
new file mode 100644
index 000000000..7135ea1d7
--- /dev/null
+++ b/arch/powerpc/platforms/powermac/pic.c
@@ -0,0 +1,650 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Support for the interrupt controllers found on Power Macintosh,
+ * currently Apple's "Grand Central" interrupt controller in all
+ * it's incarnations. OpenPIC support used on newer machines is
+ * in a separate file
+ *
+ * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
+ * Copyright (C) 2005 Benjamin Herrenschmidt (benh@kernel.crashing.org)
+ * IBM, Corp.
+ */
+
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/syscore_ops.h>
+#include <linux/adb.h>
+#include <linux/minmax.h>
+#include <linux/pmu.h>
+#include <linux/irqdomain.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+#include <asm/sections.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/pci-bridge.h>
+#include <asm/time.h>
+#include <asm/pmac_feature.h>
+#include <asm/mpic.h>
+#include <asm/xmon.h>
+
+#include "pmac.h"
+
+#ifdef CONFIG_PPC32
+struct pmac_irq_hw {
+ unsigned int event;
+ unsigned int enable;
+ unsigned int ack;
+ unsigned int level;
+};
+
+/* Workaround flags for 32bit powermac machines */
+unsigned int of_irq_workarounds;
+struct device_node *of_irq_dflt_pic;
+
+/* Default addresses */
+static volatile struct pmac_irq_hw __iomem *pmac_irq_hw[4];
+
+static int max_irqs;
+static int max_real_irqs;
+
+static DEFINE_RAW_SPINLOCK(pmac_pic_lock);
+
+/* The max irq number this driver deals with is 128; see max_irqs */
+static DECLARE_BITMAP(ppc_lost_interrupts, 128);
+static DECLARE_BITMAP(ppc_cached_irq_mask, 128);
+static int pmac_irq_cascade = -1;
+static struct irq_domain *pmac_pic_host;
+
+static void __pmac_retrigger(unsigned int irq_nr)
+{
+ if (irq_nr >= max_real_irqs && pmac_irq_cascade > 0) {
+ __set_bit(irq_nr, ppc_lost_interrupts);
+ irq_nr = pmac_irq_cascade;
+ mb();
+ }
+ if (!__test_and_set_bit(irq_nr, ppc_lost_interrupts)) {
+ atomic_inc(&ppc_n_lost_interrupts);
+ set_dec(1);
+ }
+}
+
+static void pmac_mask_and_ack_irq(struct irq_data *d)
+{
+ unsigned int src = irqd_to_hwirq(d);
+ unsigned long bit = 1UL << (src & 0x1f);
+ int i = src >> 5;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&pmac_pic_lock, flags);
+ __clear_bit(src, ppc_cached_irq_mask);
+ if (__test_and_clear_bit(src, ppc_lost_interrupts))
+ atomic_dec(&ppc_n_lost_interrupts);
+ out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);
+ out_le32(&pmac_irq_hw[i]->ack, bit);
+ do {
+ /* make sure ack gets to controller before we enable
+ interrupts */
+ mb();
+ } while((in_le32(&pmac_irq_hw[i]->enable) & bit)
+ != (ppc_cached_irq_mask[i] & bit));
+ raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
+}
+
+static void pmac_ack_irq(struct irq_data *d)
+{
+ unsigned int src = irqd_to_hwirq(d);
+ unsigned long bit = 1UL << (src & 0x1f);
+ int i = src >> 5;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&pmac_pic_lock, flags);
+ if (__test_and_clear_bit(src, ppc_lost_interrupts))
+ atomic_dec(&ppc_n_lost_interrupts);
+ out_le32(&pmac_irq_hw[i]->ack, bit);
+ (void)in_le32(&pmac_irq_hw[i]->ack);
+ raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
+}
+
+static void __pmac_set_irq_mask(unsigned int irq_nr, int nokicklost)
+{
+ unsigned long bit = 1UL << (irq_nr & 0x1f);
+ int i = irq_nr >> 5;
+
+ if ((unsigned)irq_nr >= max_irqs)
+ return;
+
+ /* enable unmasked interrupts */
+ out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);
+
+ do {
+ /* make sure mask gets to controller before we
+ return to user */
+ mb();
+ } while((in_le32(&pmac_irq_hw[i]->enable) & bit)
+ != (ppc_cached_irq_mask[i] & bit));
+
+ /*
+ * Unfortunately, setting the bit in the enable register
+ * when the device interrupt is already on *doesn't* set
+ * the bit in the flag register or request another interrupt.
+ */
+ if (bit & ppc_cached_irq_mask[i] & in_le32(&pmac_irq_hw[i]->level))
+ __pmac_retrigger(irq_nr);
+}
+
+/* When an irq gets requested for the first client, if it's an
+ * edge interrupt, we clear any previous one on the controller
+ */
+static unsigned int pmac_startup_irq(struct irq_data *d)
+{
+ unsigned long flags;
+ unsigned int src = irqd_to_hwirq(d);
+ unsigned long bit = 1UL << (src & 0x1f);
+ int i = src >> 5;
+
+ raw_spin_lock_irqsave(&pmac_pic_lock, flags);
+ if (!irqd_is_level_type(d))
+ out_le32(&pmac_irq_hw[i]->ack, bit);
+ __set_bit(src, ppc_cached_irq_mask);
+ __pmac_set_irq_mask(src, 0);
+ raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
+
+ return 0;
+}
+
+static void pmac_mask_irq(struct irq_data *d)
+{
+ unsigned long flags;
+ unsigned int src = irqd_to_hwirq(d);
+
+ raw_spin_lock_irqsave(&pmac_pic_lock, flags);
+ __clear_bit(src, ppc_cached_irq_mask);
+ __pmac_set_irq_mask(src, 1);
+ raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
+}
+
+static void pmac_unmask_irq(struct irq_data *d)
+{
+ unsigned long flags;
+ unsigned int src = irqd_to_hwirq(d);
+
+ raw_spin_lock_irqsave(&pmac_pic_lock, flags);
+ __set_bit(src, ppc_cached_irq_mask);
+ __pmac_set_irq_mask(src, 0);
+ raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
+}
+
+static int pmac_retrigger(struct irq_data *d)
+{
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&pmac_pic_lock, flags);
+ __pmac_retrigger(irqd_to_hwirq(d));
+ raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
+ return 1;
+}
+
+static struct irq_chip pmac_pic = {
+ .name = "PMAC-PIC",
+ .irq_startup = pmac_startup_irq,
+ .irq_mask = pmac_mask_irq,
+ .irq_ack = pmac_ack_irq,
+ .irq_mask_ack = pmac_mask_and_ack_irq,
+ .irq_unmask = pmac_unmask_irq,
+ .irq_retrigger = pmac_retrigger,
+};
+
+static irqreturn_t gatwick_action(int cpl, void *dev_id)
+{
+ unsigned long flags;
+ int irq, bits;
+ int rc = IRQ_NONE;
+
+ raw_spin_lock_irqsave(&pmac_pic_lock, flags);
+ for (irq = max_irqs; (irq -= 32) >= max_real_irqs; ) {
+ int i = irq >> 5;
+ bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];
+ bits |= in_le32(&pmac_irq_hw[i]->level);
+ bits &= ppc_cached_irq_mask[i];
+ if (bits == 0)
+ continue;
+ irq += __ilog2(bits);
+ raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
+ generic_handle_irq(irq);
+ raw_spin_lock_irqsave(&pmac_pic_lock, flags);
+ rc = IRQ_HANDLED;
+ }
+ raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
+ return rc;
+}
+
+static unsigned int pmac_pic_get_irq(void)
+{
+ int irq;
+ unsigned long bits = 0;
+ unsigned long flags;
+
+#ifdef CONFIG_PPC_PMAC32_PSURGE
+ /* IPI's are a hack on the powersurge -- Cort */
+ if (smp_processor_id() != 0) {
+ return psurge_secondary_virq;
+ }
+#endif /* CONFIG_PPC_PMAC32_PSURGE */
+ raw_spin_lock_irqsave(&pmac_pic_lock, flags);
+ for (irq = max_real_irqs; (irq -= 32) >= 0; ) {
+ int i = irq >> 5;
+ bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];
+ bits |= in_le32(&pmac_irq_hw[i]->level);
+ bits &= ppc_cached_irq_mask[i];
+ if (bits == 0)
+ continue;
+ irq += __ilog2(bits);
+ break;
+ }
+ raw_spin_unlock_irqrestore(&pmac_pic_lock, flags);
+ if (unlikely(irq < 0))
+ return 0;
+ return irq_linear_revmap(pmac_pic_host, irq);
+}
+
+static int pmac_pic_host_match(struct irq_domain *h, struct device_node *node,
+ enum irq_domain_bus_token bus_token)
+{
+ /* We match all, we don't always have a node anyway */
+ return 1;
+}
+
+static int pmac_pic_host_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ if (hw >= max_irqs)
+ return -EINVAL;
+
+ /* Mark level interrupts, set delayed disable for edge ones and set
+ * handlers
+ */
+ irq_set_status_flags(virq, IRQ_LEVEL);
+ irq_set_chip_and_handler(virq, &pmac_pic, handle_level_irq);
+ return 0;
+}
+
+static const struct irq_domain_ops pmac_pic_host_ops = {
+ .match = pmac_pic_host_match,
+ .map = pmac_pic_host_map,
+ .xlate = irq_domain_xlate_onecell,
+};
+
+static void __init pmac_pic_probe_oldstyle(void)
+{
+ int i;
+ struct device_node *master = NULL;
+ struct device_node *slave = NULL;
+ u8 __iomem *addr;
+ struct resource r;
+
+ /* Set our get_irq function */
+ ppc_md.get_irq = pmac_pic_get_irq;
+
+ /*
+ * Find the interrupt controller type & node
+ */
+
+ if ((master = of_find_node_by_name(NULL, "gc")) != NULL) {
+ max_irqs = max_real_irqs = 32;
+ } else if ((master = of_find_node_by_name(NULL, "ohare")) != NULL) {
+ max_irqs = max_real_irqs = 32;
+ /* We might have a second cascaded ohare */
+ slave = of_find_node_by_name(NULL, "pci106b,7");
+ if (slave)
+ max_irqs = 64;
+ } else if ((master = of_find_node_by_name(NULL, "mac-io")) != NULL) {
+ max_irqs = max_real_irqs = 64;
+
+ /* We might have a second cascaded heathrow */
+
+ /* Compensate for of_node_put() in of_find_node_by_name() */
+ of_node_get(master);
+ slave = of_find_node_by_name(master, "mac-io");
+
+ /* Check ordering of master & slave */
+ if (of_device_is_compatible(master, "gatwick")) {
+ BUG_ON(slave == NULL);
+ swap(master, slave);
+ }
+
+ /* We found a slave */
+ if (slave)
+ max_irqs = 128;
+ }
+ BUG_ON(master == NULL);
+
+ /*
+ * Allocate an irq host
+ */
+ pmac_pic_host = irq_domain_add_linear(master, max_irqs,
+ &pmac_pic_host_ops, NULL);
+ BUG_ON(pmac_pic_host == NULL);
+ irq_set_default_host(pmac_pic_host);
+
+ /* Get addresses of first controller if we have a node for it */
+ BUG_ON(of_address_to_resource(master, 0, &r));
+
+ /* Map interrupts of primary controller */
+ addr = (u8 __iomem *) ioremap(r.start, 0x40);
+ i = 0;
+ pmac_irq_hw[i++] = (volatile struct pmac_irq_hw __iomem *)
+ (addr + 0x20);
+ if (max_real_irqs > 32)
+ pmac_irq_hw[i++] = (volatile struct pmac_irq_hw __iomem *)
+ (addr + 0x10);
+ of_node_put(master);
+
+ printk(KERN_INFO "irq: Found primary Apple PIC %pOF for %d irqs\n",
+ master, max_real_irqs);
+
+ /* Map interrupts of cascaded controller */
+ if (slave && !of_address_to_resource(slave, 0, &r)) {
+ addr = (u8 __iomem *)ioremap(r.start, 0x40);
+ pmac_irq_hw[i++] = (volatile struct pmac_irq_hw __iomem *)
+ (addr + 0x20);
+ if (max_irqs > 64)
+ pmac_irq_hw[i++] =
+ (volatile struct pmac_irq_hw __iomem *)
+ (addr + 0x10);
+ pmac_irq_cascade = irq_of_parse_and_map(slave, 0);
+
+ printk(KERN_INFO "irq: Found slave Apple PIC %pOF for %d irqs"
+ " cascade: %d\n", slave,
+ max_irqs - max_real_irqs, pmac_irq_cascade);
+ }
+ of_node_put(slave);
+
+ /* Disable all interrupts in all controllers */
+ for (i = 0; i * 32 < max_irqs; ++i)
+ out_le32(&pmac_irq_hw[i]->enable, 0);
+
+ /* Hookup cascade irq */
+ if (slave && pmac_irq_cascade) {
+ if (request_irq(pmac_irq_cascade, gatwick_action,
+ IRQF_NO_THREAD, "cascade", NULL))
+ pr_err("Failed to register cascade interrupt\n");
+ }
+
+ printk(KERN_INFO "irq: System has %d possible interrupts\n", max_irqs);
+#ifdef CONFIG_XMON
+ i = irq_create_mapping(NULL, 20);
+ if (request_irq(i, xmon_irq, IRQF_NO_THREAD, "NMI - XMON", NULL))
+ pr_err("Failed to register NMI-XMON interrupt\n");
+#endif
+}
+
+int of_irq_parse_oldworld(const struct device_node *device, int index,
+ struct of_phandle_args *out_irq)
+{
+ const u32 *ints = NULL;
+ int intlen;
+
+ /*
+ * Old machines just have a list of interrupt numbers
+ * and no interrupt-controller nodes. We also have dodgy
+ * cases where the APPL,interrupts property is completely
+ * missing behind pci-pci bridges and we have to get it
+ * from the parent (the bridge itself, as apple just wired
+ * everything together on these)
+ */
+ while (device) {
+ ints = of_get_property(device, "AAPL,interrupts", &intlen);
+ if (ints != NULL)
+ break;
+ device = device->parent;
+ if (!of_node_is_type(device, "pci"))
+ break;
+ }
+ if (ints == NULL)
+ return -EINVAL;
+ intlen /= sizeof(u32);
+
+ if (index >= intlen)
+ return -EINVAL;
+
+ out_irq->np = NULL;
+ out_irq->args[0] = ints[index];
+ out_irq->args_count = 1;
+
+ return 0;
+}
+#endif /* CONFIG_PPC32 */
+
+static void __init pmac_pic_setup_mpic_nmi(struct mpic *mpic)
+{
+#if defined(CONFIG_XMON) && defined(CONFIG_PPC32)
+ struct device_node* pswitch;
+ int nmi_irq;
+
+ pswitch = of_find_node_by_name(NULL, "programmer-switch");
+ if (pswitch) {
+ nmi_irq = irq_of_parse_and_map(pswitch, 0);
+ if (nmi_irq) {
+ mpic_irq_set_priority(nmi_irq, 9);
+ if (request_irq(nmi_irq, xmon_irq, IRQF_NO_THREAD,
+ "NMI - XMON", NULL))
+ pr_err("Failed to register NMI-XMON interrupt\n");
+ }
+ of_node_put(pswitch);
+ }
+#endif /* defined(CONFIG_XMON) && defined(CONFIG_PPC32) */
+}
+
+static struct mpic * __init pmac_setup_one_mpic(struct device_node *np,
+ int master)
+{
+ const char *name = master ? " MPIC 1 " : " MPIC 2 ";
+ struct mpic *mpic;
+ unsigned int flags = master ? 0 : MPIC_SECONDARY;
+
+ pmac_call_feature(PMAC_FTR_ENABLE_MPIC, np, 0, 0);
+
+ if (of_property_read_bool(np, "big-endian"))
+ flags |= MPIC_BIG_ENDIAN;
+
+ /* Primary Big Endian means HT interrupts. This is quite dodgy
+ * but works until I find a better way
+ */
+ if (master && (flags & MPIC_BIG_ENDIAN))
+ flags |= MPIC_U3_HT_IRQS;
+
+ mpic = mpic_alloc(np, 0, flags, 0, 0, name);
+ if (mpic == NULL)
+ return NULL;
+
+ mpic_init(mpic);
+
+ return mpic;
+ }
+
+static int __init pmac_pic_probe_mpic(void)
+{
+ struct mpic *mpic1, *mpic2;
+ struct device_node *np, *master = NULL, *slave = NULL;
+
+ /* We can have up to 2 MPICs cascaded */
+ for_each_node_by_type(np, "open-pic") {
+ if (master == NULL && !of_property_present(np, "interrupts"))
+ master = of_node_get(np);
+ else if (slave == NULL)
+ slave = of_node_get(np);
+ if (master && slave) {
+ of_node_put(np);
+ break;
+ }
+ }
+
+ /* Check for bogus setups */
+ if (master == NULL && slave != NULL) {
+ master = slave;
+ slave = NULL;
+ }
+
+ /* Not found, default to good old pmac pic */
+ if (master == NULL)
+ return -ENODEV;
+
+ /* Set master handler */
+ ppc_md.get_irq = mpic_get_irq;
+
+ /* Setup master */
+ mpic1 = pmac_setup_one_mpic(master, 1);
+ BUG_ON(mpic1 == NULL);
+
+ /* Install NMI if any */
+ pmac_pic_setup_mpic_nmi(mpic1);
+
+ of_node_put(master);
+
+ /* Set up a cascaded controller, if present */
+ if (slave) {
+ mpic2 = pmac_setup_one_mpic(slave, 0);
+ if (mpic2 == NULL)
+ printk(KERN_ERR "Failed to setup slave MPIC\n");
+ of_node_put(slave);
+ }
+
+ return 0;
+}
+
+
+void __init pmac_pic_init(void)
+{
+ /* We configure the OF parsing based on our oldworld vs. newworld
+ * platform type and whether we were booted by BootX.
+ */
+#ifdef CONFIG_PPC32
+ if (!pmac_newworld)
+ of_irq_workarounds |= OF_IMAP_OLDWORLD_MAC;
+ if (of_property_read_bool(of_chosen, "linux,bootx"))
+ of_irq_workarounds |= OF_IMAP_NO_PHANDLE;
+
+ /* If we don't have phandles on a newworld, then try to locate a
+ * default interrupt controller (happens when booting with BootX).
+ * We do a first match here, hopefully, that only ever happens on
+ * machines with one controller.
+ */
+ if (pmac_newworld && (of_irq_workarounds & OF_IMAP_NO_PHANDLE)) {
+ struct device_node *np;
+
+ for_each_node_with_property(np, "interrupt-controller") {
+ /* Skip /chosen/interrupt-controller */
+ if (of_node_name_eq(np, "chosen"))
+ continue;
+ /* It seems like at least one person wants
+ * to use BootX on a machine with an AppleKiwi
+ * controller which happens to pretend to be an
+ * interrupt controller too. */
+ if (of_node_name_eq(np, "AppleKiwi"))
+ continue;
+ /* I think we found one ! */
+ of_irq_dflt_pic = np;
+ break;
+ }
+ }
+#endif /* CONFIG_PPC32 */
+
+ /* We first try to detect Apple's new Core99 chipset, since mac-io
+ * is quite different on those machines and contains an IBM MPIC2.
+ */
+ if (pmac_pic_probe_mpic() == 0)
+ return;
+
+#ifdef CONFIG_PPC32
+ pmac_pic_probe_oldstyle();
+#endif
+}
+
+#if defined(CONFIG_PM) && defined(CONFIG_PPC32)
+/*
+ * These procedures are used in implementing sleep on the powerbooks.
+ * sleep_save_intrs() saves the states of all interrupt enables
+ * and disables all interrupts except for the nominated one.
+ * sleep_restore_intrs() restores the states of all interrupt enables.
+ */
+unsigned long sleep_save_mask[2];
+
+/* This used to be passed by the PMU driver but that link got
+ * broken with the new driver model. We use this tweak for now...
+ * We really want to do things differently though...
+ */
+static int pmacpic_find_viaint(void)
+{
+ int viaint = -1;
+
+#ifdef CONFIG_ADB_PMU
+ struct device_node *np;
+
+ if (pmu_get_model() != PMU_OHARE_BASED)
+ goto not_found;
+ np = of_find_node_by_name(NULL, "via-pmu");
+ if (np == NULL)
+ goto not_found;
+ viaint = irq_of_parse_and_map(np, 0);
+ of_node_put(np);
+
+not_found:
+#endif /* CONFIG_ADB_PMU */
+ return viaint;
+}
+
+static int pmacpic_suspend(void)
+{
+ int viaint = pmacpic_find_viaint();
+
+ sleep_save_mask[0] = ppc_cached_irq_mask[0];
+ sleep_save_mask[1] = ppc_cached_irq_mask[1];
+ ppc_cached_irq_mask[0] = 0;
+ ppc_cached_irq_mask[1] = 0;
+ if (viaint > 0)
+ set_bit(viaint, ppc_cached_irq_mask);
+ out_le32(&pmac_irq_hw[0]->enable, ppc_cached_irq_mask[0]);
+ if (max_real_irqs > 32)
+ out_le32(&pmac_irq_hw[1]->enable, ppc_cached_irq_mask[1]);
+ (void)in_le32(&pmac_irq_hw[0]->event);
+ /* make sure mask gets to controller before we return to caller */
+ mb();
+ (void)in_le32(&pmac_irq_hw[0]->enable);
+
+ return 0;
+}
+
+static void pmacpic_resume(void)
+{
+ int i;
+
+ out_le32(&pmac_irq_hw[0]->enable, 0);
+ if (max_real_irqs > 32)
+ out_le32(&pmac_irq_hw[1]->enable, 0);
+ mb();
+ for (i = 0; i < max_real_irqs; ++i)
+ if (test_bit(i, sleep_save_mask))
+ pmac_unmask_irq(irq_get_irq_data(i));
+}
+
+static struct syscore_ops pmacpic_syscore_ops = {
+ .suspend = pmacpic_suspend,
+ .resume = pmacpic_resume,
+};
+
+static int __init init_pmacpic_syscore(void)
+{
+ if (pmac_irq_hw[0])
+ register_syscore_ops(&pmacpic_syscore_ops);
+ return 0;
+}
+
+machine_subsys_initcall(powermac, init_pmacpic_syscore);
+
+#endif /* CONFIG_PM && CONFIG_PPC32 */
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