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80 lines
2.4 KiB
80 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Interrupt handling for IPR-based IRQ. |
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* |
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* Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi |
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* Copyright (C) 2000 Kazumoto Kojima |
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* Copyright (C) 2003 Takashi Kusuda <[email protected]> |
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* Copyright (C) 2006 Paul Mundt |
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* |
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* Supported system: |
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* On-chip supporting modules (TMU, RTC, etc.). |
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* On-chip supporting modules for SH7709/SH7709A/SH7729. |
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* Hitachi SolutionEngine external I/O: |
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* MS7709SE01, MS7709ASE01, and MS7750SE01 |
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*/ |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/irq.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/topology.h> |
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static inline struct ipr_desc *get_ipr_desc(struct irq_data *data) |
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{ |
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struct irq_chip *chip = irq_data_get_irq_chip(data); |
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return container_of(chip, struct ipr_desc, chip); |
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} |
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static void disable_ipr_irq(struct irq_data *data) |
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{ |
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struct ipr_data *p = irq_data_get_irq_chip_data(data); |
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unsigned long addr = get_ipr_desc(data)->ipr_offsets[p->ipr_idx]; |
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/* Set the priority in IPR to 0 */ |
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__raw_writew(__raw_readw(addr) & (0xffff ^ (0xf << p->shift)), addr); |
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(void)__raw_readw(addr); /* Read back to flush write posting */ |
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} |
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static void enable_ipr_irq(struct irq_data *data) |
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{ |
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struct ipr_data *p = irq_data_get_irq_chip_data(data); |
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unsigned long addr = get_ipr_desc(data)->ipr_offsets[p->ipr_idx]; |
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/* Set priority in IPR back to original value */ |
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__raw_writew(__raw_readw(addr) | (p->priority << p->shift), addr); |
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} |
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/* |
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* The shift value is now the number of bits to shift, not the number of |
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* bits/4. This is to make it easier to read the value directly from the |
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* datasheets. The IPR address is calculated using the ipr_offset table. |
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*/ |
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void register_ipr_controller(struct ipr_desc *desc) |
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{ |
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int i; |
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desc->chip.irq_mask = disable_ipr_irq; |
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desc->chip.irq_unmask = enable_ipr_irq; |
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for (i = 0; i < desc->nr_irqs; i++) { |
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struct ipr_data *p = desc->ipr_data + i; |
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int res; |
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BUG_ON(p->ipr_idx >= desc->nr_offsets); |
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BUG_ON(!desc->ipr_offsets[p->ipr_idx]); |
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res = irq_alloc_desc_at(p->irq, numa_node_id()); |
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if (unlikely(res != p->irq && res != -EEXIST)) { |
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printk(KERN_INFO "can not get irq_desc for %d\n", |
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p->irq); |
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continue; |
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} |
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disable_irq_nosync(p->irq); |
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irq_set_chip_and_handler_name(p->irq, &desc->chip, |
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handle_level_irq, "level"); |
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irq_set_chip_data(p->irq, p); |
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disable_ipr_irq(irq_get_irq_data(p->irq)); |
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} |
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} |
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EXPORT_SYMBOL(register_ipr_controller);
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