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235 lines
5.1 KiB
235 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* arch/powerpc/platforms/embedded6xx/hlwd-pic.c |
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* |
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* Nintendo Wii "Hollywood" interrupt controller support. |
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* Copyright (C) 2009 The GameCube Linux Team |
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* Copyright (C) 2009 Albert Herranz |
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*/ |
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#define DRV_MODULE_NAME "hlwd-pic" |
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#define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt |
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#include <linux/kernel.h> |
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#include <linux/irq.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/of_irq.h> |
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#include <asm/io.h> |
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#include "hlwd-pic.h" |
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#define HLWD_NR_IRQS 32 |
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/* |
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* Each interrupt has a corresponding bit in both |
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* the Interrupt Cause (ICR) and Interrupt Mask (IMR) registers. |
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* |
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* Enabling/disabling an interrupt line involves asserting/clearing |
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* the corresponding bit in IMR. ACK'ing a request simply involves |
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* asserting the corresponding bit in ICR. |
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*/ |
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#define HW_BROADWAY_ICR 0x00 |
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#define HW_BROADWAY_IMR 0x04 |
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#define HW_STARLET_ICR 0x08 |
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#define HW_STARLET_IMR 0x0c |
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/* |
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* IRQ chip hooks. |
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* |
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*/ |
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static void hlwd_pic_mask_and_ack(struct irq_data *d) |
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{ |
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int irq = irqd_to_hwirq(d); |
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void __iomem *io_base = irq_data_get_irq_chip_data(d); |
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u32 mask = 1 << irq; |
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clrbits32(io_base + HW_BROADWAY_IMR, mask); |
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out_be32(io_base + HW_BROADWAY_ICR, mask); |
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} |
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static void hlwd_pic_ack(struct irq_data *d) |
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{ |
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int irq = irqd_to_hwirq(d); |
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void __iomem *io_base = irq_data_get_irq_chip_data(d); |
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out_be32(io_base + HW_BROADWAY_ICR, 1 << irq); |
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} |
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static void hlwd_pic_mask(struct irq_data *d) |
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{ |
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int irq = irqd_to_hwirq(d); |
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void __iomem *io_base = irq_data_get_irq_chip_data(d); |
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clrbits32(io_base + HW_BROADWAY_IMR, 1 << irq); |
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} |
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static void hlwd_pic_unmask(struct irq_data *d) |
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{ |
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int irq = irqd_to_hwirq(d); |
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void __iomem *io_base = irq_data_get_irq_chip_data(d); |
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setbits32(io_base + HW_BROADWAY_IMR, 1 << irq); |
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/* Make sure the ARM (aka. Starlet) doesn't handle this interrupt. */ |
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clrbits32(io_base + HW_STARLET_IMR, 1 << irq); |
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} |
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static struct irq_chip hlwd_pic = { |
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.name = "hlwd-pic", |
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.irq_ack = hlwd_pic_ack, |
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.irq_mask_ack = hlwd_pic_mask_and_ack, |
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.irq_mask = hlwd_pic_mask, |
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.irq_unmask = hlwd_pic_unmask, |
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}; |
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/* |
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* IRQ host hooks. |
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* |
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*/ |
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static struct irq_domain *hlwd_irq_host; |
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static int hlwd_pic_map(struct irq_domain *h, unsigned int virq, |
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irq_hw_number_t hwirq) |
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{ |
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irq_set_chip_data(virq, h->host_data); |
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irq_set_status_flags(virq, IRQ_LEVEL); |
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irq_set_chip_and_handler(virq, &hlwd_pic, handle_level_irq); |
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return 0; |
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} |
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static const struct irq_domain_ops hlwd_irq_domain_ops = { |
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.map = hlwd_pic_map, |
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}; |
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static unsigned int __hlwd_pic_get_irq(struct irq_domain *h) |
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{ |
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void __iomem *io_base = h->host_data; |
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int irq; |
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u32 irq_status; |
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irq_status = in_be32(io_base + HW_BROADWAY_ICR) & |
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in_be32(io_base + HW_BROADWAY_IMR); |
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if (irq_status == 0) |
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return 0; /* no more IRQs pending */ |
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irq = __ffs(irq_status); |
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return irq_linear_revmap(h, irq); |
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} |
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static void hlwd_pic_irq_cascade(struct irq_desc *desc) |
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{ |
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struct irq_chip *chip = irq_desc_get_chip(desc); |
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struct irq_domain *irq_domain = irq_desc_get_handler_data(desc); |
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unsigned int virq; |
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raw_spin_lock(&desc->lock); |
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chip->irq_mask(&desc->irq_data); /* IRQ_LEVEL */ |
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raw_spin_unlock(&desc->lock); |
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virq = __hlwd_pic_get_irq(irq_domain); |
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if (virq) |
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generic_handle_irq(virq); |
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else |
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pr_err("spurious interrupt!\n"); |
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raw_spin_lock(&desc->lock); |
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chip->irq_ack(&desc->irq_data); /* IRQ_LEVEL */ |
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if (!irqd_irq_disabled(&desc->irq_data) && chip->irq_unmask) |
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chip->irq_unmask(&desc->irq_data); |
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raw_spin_unlock(&desc->lock); |
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} |
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/* |
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* Platform hooks. |
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* |
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*/ |
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static void __hlwd_quiesce(void __iomem *io_base) |
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{ |
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/* mask and ack all IRQs */ |
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out_be32(io_base + HW_BROADWAY_IMR, 0); |
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out_be32(io_base + HW_BROADWAY_ICR, 0xffffffff); |
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} |
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static struct irq_domain *hlwd_pic_init(struct device_node *np) |
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{ |
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struct irq_domain *irq_domain; |
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struct resource res; |
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void __iomem *io_base; |
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int retval; |
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retval = of_address_to_resource(np, 0, &res); |
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if (retval) { |
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pr_err("no io memory range found\n"); |
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return NULL; |
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} |
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io_base = ioremap(res.start, resource_size(&res)); |
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if (!io_base) { |
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pr_err("ioremap failed\n"); |
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return NULL; |
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} |
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pr_info("controller at 0x%08x mapped to 0x%p\n", res.start, io_base); |
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__hlwd_quiesce(io_base); |
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irq_domain = irq_domain_add_linear(np, HLWD_NR_IRQS, |
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&hlwd_irq_domain_ops, io_base); |
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if (!irq_domain) { |
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pr_err("failed to allocate irq_domain\n"); |
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iounmap(io_base); |
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return NULL; |
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} |
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return irq_domain; |
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} |
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unsigned int hlwd_pic_get_irq(void) |
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{ |
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return __hlwd_pic_get_irq(hlwd_irq_host); |
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} |
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/* |
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* Probe function. |
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* |
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*/ |
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void hlwd_pic_probe(void) |
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{ |
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struct irq_domain *host; |
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struct device_node *np; |
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const u32 *interrupts; |
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int cascade_virq; |
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for_each_compatible_node(np, NULL, "nintendo,hollywood-pic") { |
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interrupts = of_get_property(np, "interrupts", NULL); |
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if (interrupts) { |
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host = hlwd_pic_init(np); |
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BUG_ON(!host); |
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cascade_virq = irq_of_parse_and_map(np, 0); |
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irq_set_handler_data(cascade_virq, host); |
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irq_set_chained_handler(cascade_virq, |
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hlwd_pic_irq_cascade); |
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hlwd_irq_host = host; |
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break; |
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} |
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} |
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} |
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/** |
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* hlwd_quiesce() - quiesce hollywood irq controller |
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* |
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* Mask and ack all interrupt sources. |
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* |
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*/ |
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void hlwd_quiesce(void) |
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{ |
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void __iomem *io_base = hlwd_irq_host->host_data; |
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__hlwd_quiesce(io_base); |
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} |
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