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243 lines
5.1 KiB
243 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* arch/powerpc/platforms/embedded6xx/flipper-pic.c |
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* |
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* Nintendo GameCube/Wii "Flipper" interrupt controller support. |
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* Copyright (C) 2004-2009 The GameCube Linux Team |
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* Copyright (C) 2007,2008,2009 Albert Herranz |
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*/ |
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#define DRV_MODULE_NAME "flipper-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/init.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 <asm/io.h> |
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#include "flipper-pic.h" |
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#define FLIPPER_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 setting/clearing |
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* the corresponding bit in IMR. |
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* Except for the RSW interrupt, all interrupts get deasserted automatically |
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* when the source deasserts the interrupt. |
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*/ |
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#define FLIPPER_ICR 0x00 |
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#define FLIPPER_ICR_RSS (1<<16) /* reset switch state */ |
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#define FLIPPER_IMR 0x04 |
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#define FLIPPER_RESET 0x24 |
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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 flipper_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 + FLIPPER_IMR, mask); |
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/* this is at least needed for RSW */ |
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out_be32(io_base + FLIPPER_ICR, mask); |
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} |
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static void flipper_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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/* this is at least needed for RSW */ |
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out_be32(io_base + FLIPPER_ICR, 1 << irq); |
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} |
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static void flipper_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 + FLIPPER_IMR, 1 << irq); |
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} |
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static void flipper_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 + FLIPPER_IMR, 1 << irq); |
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} |
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static struct irq_chip flipper_pic = { |
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.name = "flipper-pic", |
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.irq_ack = flipper_pic_ack, |
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.irq_mask_ack = flipper_pic_mask_and_ack, |
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.irq_mask = flipper_pic_mask, |
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.irq_unmask = flipper_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 *flipper_irq_host; |
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static int flipper_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, &flipper_pic, handle_level_irq); |
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return 0; |
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} |
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static const struct irq_domain_ops flipper_irq_domain_ops = { |
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.map = flipper_pic_map, |
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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 __flipper_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 + FLIPPER_IMR, 0x00000000); |
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out_be32(io_base + FLIPPER_ICR, 0xffffffff); |
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} |
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static struct irq_domain * __init flipper_pic_init(struct device_node *np) |
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{ |
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struct device_node *pi; |
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struct irq_domain *irq_domain = NULL; |
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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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pi = of_get_parent(np); |
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if (!pi) { |
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pr_err("no parent found\n"); |
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goto out; |
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} |
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if (!of_device_is_compatible(pi, "nintendo,flipper-pi")) { |
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pr_err("unexpected parent compatible\n"); |
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goto out; |
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} |
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retval = of_address_to_resource(pi, 0, &res); |
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if (retval) { |
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pr_err("no io memory range found\n"); |
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goto out; |
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} |
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io_base = ioremap(res.start, resource_size(&res)); |
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pr_info("controller at 0x%08x mapped to 0x%p\n", res.start, io_base); |
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__flipper_quiesce(io_base); |
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irq_domain = irq_domain_add_linear(np, FLIPPER_NR_IRQS, |
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&flipper_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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return NULL; |
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} |
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out: |
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return irq_domain; |
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} |
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unsigned int flipper_pic_get_irq(void) |
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{ |
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void __iomem *io_base = flipper_irq_host->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 + FLIPPER_ICR) & |
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in_be32(io_base + FLIPPER_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(flipper_irq_host, irq); |
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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 __init flipper_pic_probe(void) |
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{ |
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struct device_node *np; |
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np = of_find_compatible_node(NULL, NULL, "nintendo,flipper-pic"); |
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BUG_ON(!np); |
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flipper_irq_host = flipper_pic_init(np); |
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BUG_ON(!flipper_irq_host); |
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irq_set_default_host(flipper_irq_host); |
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of_node_put(np); |
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} |
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/* |
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* Misc functions related to the flipper chipset. |
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* |
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*/ |
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/** |
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* flipper_quiesce() - quiesce flipper 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 flipper_quiesce(void) |
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{ |
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void __iomem *io_base = flipper_irq_host->host_data; |
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__flipper_quiesce(io_base); |
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} |
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/* |
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* Resets the platform. |
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*/ |
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void flipper_platform_reset(void) |
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{ |
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void __iomem *io_base; |
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if (flipper_irq_host && flipper_irq_host->host_data) { |
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io_base = flipper_irq_host->host_data; |
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out_8(io_base + FLIPPER_RESET, 0x00); |
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} |
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} |
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/* |
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* Returns non-zero if the reset button is pressed. |
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*/ |
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int flipper_is_reset_button_pressed(void) |
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{ |
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void __iomem *io_base; |
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u32 icr; |
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if (flipper_irq_host && flipper_irq_host->host_data) { |
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io_base = flipper_irq_host->host_data; |
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icr = in_be32(io_base + FLIPPER_ICR); |
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return !(icr & FLIPPER_ICR_RSS); |
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} |
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return 0; |
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} |
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