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110 lines
2.7 KiB
110 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Aspeed 24XX/25XX I2C Interrupt Controller. |
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* |
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* Copyright (C) 2012-2017 ASPEED Technology Inc. |
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* Copyright 2017 IBM Corporation |
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* Copyright 2017 Google, Inc. |
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*/ |
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#include <linux/irq.h> |
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#include <linux/irqchip.h> |
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#include <linux/irqchip/chained_irq.h> |
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#include <linux/irqdomain.h> |
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#include <linux/of_address.h> |
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#include <linux/of_irq.h> |
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#include <linux/io.h> |
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#define ASPEED_I2C_IC_NUM_BUS 14 |
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struct aspeed_i2c_ic { |
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void __iomem *base; |
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int parent_irq; |
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struct irq_domain *irq_domain; |
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}; |
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/* |
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* The aspeed chip provides a single hardware interrupt for all of the I2C |
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* busses, so we use a dummy interrupt chip to translate this single interrupt |
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* into multiple interrupts, each associated with a single I2C bus. |
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*/ |
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static void aspeed_i2c_ic_irq_handler(struct irq_desc *desc) |
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{ |
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struct aspeed_i2c_ic *i2c_ic = irq_desc_get_handler_data(desc); |
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struct irq_chip *chip = irq_desc_get_chip(desc); |
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unsigned long bit, status; |
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chained_irq_enter(chip, desc); |
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status = readl(i2c_ic->base); |
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for_each_set_bit(bit, &status, ASPEED_I2C_IC_NUM_BUS) |
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generic_handle_domain_irq(i2c_ic->irq_domain, bit); |
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chained_irq_exit(chip, desc); |
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} |
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/* |
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* Set simple handler and mark IRQ as valid. Nothing interesting to do here |
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* since we are using a dummy interrupt chip. |
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*/ |
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static int aspeed_i2c_ic_map_irq_domain(struct irq_domain *domain, |
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unsigned int irq, irq_hw_number_t hwirq) |
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{ |
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irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq); |
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irq_set_chip_data(irq, domain->host_data); |
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return 0; |
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} |
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static const struct irq_domain_ops aspeed_i2c_ic_irq_domain_ops = { |
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.map = aspeed_i2c_ic_map_irq_domain, |
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}; |
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static int __init aspeed_i2c_ic_of_init(struct device_node *node, |
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struct device_node *parent) |
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{ |
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struct aspeed_i2c_ic *i2c_ic; |
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int ret = 0; |
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i2c_ic = kzalloc(sizeof(*i2c_ic), GFP_KERNEL); |
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if (!i2c_ic) |
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return -ENOMEM; |
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i2c_ic->base = of_iomap(node, 0); |
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if (!i2c_ic->base) { |
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ret = -ENOMEM; |
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goto err_free_ic; |
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} |
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i2c_ic->parent_irq = irq_of_parse_and_map(node, 0); |
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if (i2c_ic->parent_irq < 0) { |
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ret = i2c_ic->parent_irq; |
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goto err_iounmap; |
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} |
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i2c_ic->irq_domain = irq_domain_add_linear(node, ASPEED_I2C_IC_NUM_BUS, |
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&aspeed_i2c_ic_irq_domain_ops, |
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NULL); |
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if (!i2c_ic->irq_domain) { |
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ret = -ENOMEM; |
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goto err_iounmap; |
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} |
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i2c_ic->irq_domain->name = "aspeed-i2c-domain"; |
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irq_set_chained_handler_and_data(i2c_ic->parent_irq, |
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aspeed_i2c_ic_irq_handler, i2c_ic); |
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pr_info("i2c controller registered, irq %d\n", i2c_ic->parent_irq); |
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return 0; |
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err_iounmap: |
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iounmap(i2c_ic->base); |
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err_free_ic: |
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kfree(i2c_ic); |
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return ret; |
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} |
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IRQCHIP_DECLARE(ast2400_i2c_ic, "aspeed,ast2400-i2c-ic", aspeed_i2c_ic_of_init); |
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IRQCHIP_DECLARE(ast2500_i2c_ic, "aspeed,ast2500-i2c-ic", aspeed_i2c_ic_of_init);
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