1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Interrupt handling for IPR-based IRQ. 4 * 5 * Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi 6 * Copyright (C) 2000 Kazumoto Kojima 7 * Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp> 8 * Copyright (C) 2006 Paul Mundt 9 * 10 * Supported system: 11 * On-chip supporting modules (TMU, RTC, etc.). 12 * On-chip supporting modules for SH7709/SH7709A/SH7729. 13 * Hitachi SolutionEngine external I/O: 14 * MS7709SE01, MS7709ASE01, and MS7750SE01 15 */ 16 #include <linux/init.h> 17 #include <linux/interrupt.h> 18 #include <linux/io.h> 19 #include <linux/irq.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/topology.h> 23 24 static inline struct ipr_desc *get_ipr_desc(struct irq_data *data) 25 { 26 struct irq_chip *chip = irq_data_get_irq_chip(data); 27 return container_of(chip, struct ipr_desc, chip); 28 } 29 30 static void disable_ipr_irq(struct irq_data *data) 31 { 32 struct ipr_data *p = irq_data_get_irq_chip_data(data); 33 unsigned long addr = get_ipr_desc(data)->ipr_offsets[p->ipr_idx]; 34 /* Set the priority in IPR to 0 */ 35 __raw_writew(__raw_readw(addr) & (0xffff ^ (0xf << p->shift)), addr); 36 (void)__raw_readw(addr); /* Read back to flush write posting */ 37 } 38 39 static void enable_ipr_irq(struct irq_data *data) 40 { 41 struct ipr_data *p = irq_data_get_irq_chip_data(data); 42 unsigned long addr = get_ipr_desc(data)->ipr_offsets[p->ipr_idx]; 43 /* Set priority in IPR back to original value */ 44 __raw_writew(__raw_readw(addr) | (p->priority << p->shift), addr); 45 } 46 47 /* 48 * The shift value is now the number of bits to shift, not the number of 49 * bits/4. This is to make it easier to read the value directly from the 50 * datasheets. The IPR address is calculated using the ipr_offset table. 51 */ 52 void register_ipr_controller(struct ipr_desc *desc) 53 { 54 int i; 55 56 desc->chip.irq_mask = disable_ipr_irq; 57 desc->chip.irq_unmask = enable_ipr_irq; 58 59 for (i = 0; i < desc->nr_irqs; i++) { 60 struct ipr_data *p = desc->ipr_data + i; 61 int res; 62 63 BUG_ON(p->ipr_idx >= desc->nr_offsets); 64 BUG_ON(!desc->ipr_offsets[p->ipr_idx]); 65 66 res = irq_alloc_desc_at(p->irq, numa_node_id()); 67 if (unlikely(res != p->irq && res != -EEXIST)) { 68 printk(KERN_INFO "can not get irq_desc for %d\n", 69 p->irq); 70 continue; 71 } 72 73 disable_irq_nosync(p->irq); 74 irq_set_chip_and_handler_name(p->irq, &desc->chip, 75 handle_level_irq, "level"); 76 irq_set_chip_data(p->irq, p); 77 disable_ipr_irq(irq_get_irq_data(p->irq)); 78 } 79 } 80 EXPORT_SYMBOL(register_ipr_controller); 81