diff options
Diffstat (limited to 'drivers/parisc/gsc.c')
| -rw-r--r-- | drivers/parisc/gsc.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/drivers/parisc/gsc.c b/drivers/parisc/gsc.c new file mode 100644 index 000000000..ec175ae99 --- /dev/null +++ b/drivers/parisc/gsc.c @@ -0,0 +1,275 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Interrupt management for most GSC and related devices. + * + * (c) Copyright 1999 Alex deVries for The Puffin Group + * (c) Copyright 1999 Grant Grundler for Hewlett-Packard + * (c) Copyright 1999 Matthew Wilcox + * (c) Copyright 2000 Helge Deller + * (c) Copyright 2001 Matthew Wilcox for Hewlett-Packard + */ + +#include <linux/bitops.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/types.h> + +#include <asm/hardware.h> +#include <asm/io.h> + +#include "gsc.h" + +#undef DEBUG + +#ifdef DEBUG +#define DEBPRINTK printk +#else +#define DEBPRINTK(x,...) +#endif + +int gsc_alloc_irq(struct gsc_irq *i) +{ + int irq = txn_alloc_irq(GSC_EIM_WIDTH); + if (irq < 0) { + printk("cannot get irq\n"); + return irq; + } + + i->txn_addr = txn_alloc_addr(irq); + i->txn_data = txn_alloc_data(irq); + i->irq = irq; + + return irq; +} + +int gsc_claim_irq(struct gsc_irq *i, int irq) +{ + int c = irq; + + irq += CPU_IRQ_BASE; /* virtualize the IRQ first */ + + irq = txn_claim_irq(irq); + if (irq < 0) { + printk("cannot claim irq %d\n", c); + return irq; + } + + i->txn_addr = txn_alloc_addr(irq); + i->txn_data = txn_alloc_data(irq); + i->irq = irq; + + return irq; +} + +EXPORT_SYMBOL(gsc_alloc_irq); +EXPORT_SYMBOL(gsc_claim_irq); + +/* Common interrupt demultiplexer used by Asp, Lasi & Wax. */ +irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev) +{ + unsigned long irr; + struct gsc_asic *gsc_asic = dev; + + irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR); + if (irr == 0) + return IRQ_NONE; + + DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr); + + do { + int local_irq = __ffs(irr); + unsigned int irq = gsc_asic->global_irq[local_irq]; + generic_handle_irq(irq); + irr &= ~(1 << local_irq); + } while (irr); + + return IRQ_HANDLED; +} + +int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit) +{ + int local_irq; + + for (local_irq = 0; local_irq < limit; local_irq++) { + if (global_irqs[local_irq] == irq) + return local_irq; + } + + return NO_IRQ; +} + +static void gsc_asic_mask_irq(struct irq_data *d) +{ + struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d); + int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32); + u32 imr; + + DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq, + irq_dev->name, imr); + + /* Disable the IRQ line by clearing the bit in the IMR */ + imr = gsc_readl(irq_dev->hpa + OFFSET_IMR); + imr &= ~(1 << local_irq); + gsc_writel(imr, irq_dev->hpa + OFFSET_IMR); +} + +static void gsc_asic_unmask_irq(struct irq_data *d) +{ + struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d); + int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32); + u32 imr; + + DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq, + irq_dev->name, imr); + + /* Enable the IRQ line by setting the bit in the IMR */ + imr = gsc_readl(irq_dev->hpa + OFFSET_IMR); + imr |= 1 << local_irq; + gsc_writel(imr, irq_dev->hpa + OFFSET_IMR); + /* + * FIXME: read IPR to make sure the IRQ isn't already pending. + * If so, we need to read IRR and manually call do_irq(). + */ +} + +#ifdef CONFIG_SMP +static int gsc_set_affinity_irq(struct irq_data *d, const struct cpumask *dest, + bool force) +{ + struct gsc_asic *gsc_dev = irq_data_get_irq_chip_data(d); + struct cpumask tmask; + int cpu_irq; + + if (!cpumask_and(&tmask, dest, cpu_online_mask)) + return -EINVAL; + + cpu_irq = cpu_check_affinity(d, &tmask); + if (cpu_irq < 0) + return cpu_irq; + + gsc_dev->gsc_irq.txn_addr = txn_affinity_addr(d->irq, cpu_irq); + gsc_dev->eim = ((u32) gsc_dev->gsc_irq.txn_addr) | gsc_dev->gsc_irq.txn_data; + + /* switch IRQ's for devices below LASI/WAX to other CPU */ + gsc_writel(gsc_dev->eim, gsc_dev->hpa + OFFSET_IAR); + + irq_data_update_effective_affinity(d, &tmask); + + return IRQ_SET_MASK_OK; +} +#endif + + +static struct irq_chip gsc_asic_interrupt_type = { + .name = "GSC-ASIC", + .irq_unmask = gsc_asic_unmask_irq, + .irq_mask = gsc_asic_mask_irq, +#ifdef CONFIG_SMP + .irq_set_affinity = gsc_set_affinity_irq, +#endif +}; + +int gsc_assign_irq(struct irq_chip *type, void *data) +{ + static int irq = GSC_IRQ_BASE; + + if (irq > GSC_IRQ_MAX) + return NO_IRQ; + + irq_set_chip_and_handler(irq, type, handle_simple_irq); + irq_set_chip_data(irq, data); + + return irq++; +} + +void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp) +{ + int irq = asic->global_irq[local_irq]; + + if (irq <= 0) { + irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic); + if (irq == NO_IRQ) + return; + + asic->global_irq[local_irq] = irq; + } + *irqp = irq; +} + +struct gsc_fixup_struct { + void (*choose_irq)(struct parisc_device *, void *); + void *ctrl; +}; + +static int gsc_fixup_irqs_callback(struct device *dev, void *data) +{ + struct parisc_device *padev = to_parisc_device(dev); + struct gsc_fixup_struct *gf = data; + + /* work-around for 715/64 and others which have parent + at path [5] and children at path [5/0/x] */ + if (padev->id.hw_type == HPHW_FAULTY) + gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq); + gf->choose_irq(padev, gf->ctrl); + + return 0; +} + +void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl, + void (*choose_irq)(struct parisc_device *, void *)) +{ + struct gsc_fixup_struct data = { + .choose_irq = choose_irq, + .ctrl = ctrl, + }; + + device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback); +} + +int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic) +{ + struct resource *res; + int i; + + gsc_asic->gsc = parent; + + /* Initialise local irq -> global irq mapping */ + for (i = 0; i < 32; i++) { + gsc_asic->global_irq[i] = NO_IRQ; + } + + /* allocate resource region */ + res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name); + if (res) { + res->flags = IORESOURCE_MEM; /* do not mark it busy ! */ + } + +#if 0 + printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name, + parent->irq, gsc_asic->eim); + if (gsc_readl(gsc_asic->hpa + OFFSET_IMR)) + printk(" IMR is non-zero! (0x%x)", + gsc_readl(gsc_asic->hpa + OFFSET_IMR)); + printk("\n"); +#endif + + return 0; +} + +extern struct parisc_driver lasi_driver; +extern struct parisc_driver asp_driver; +extern struct parisc_driver wax_driver; + +void __init gsc_init(void) +{ +#ifdef CONFIG_GSC_LASI + register_parisc_driver(&lasi_driver); + register_parisc_driver(&asp_driver); +#endif +#ifdef CONFIG_GSC_WAX + register_parisc_driver(&wax_driver); +#endif +} |