1 /* 2 * Interrupt handling for IPR-based IRQ. 3 * 4 * Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi 5 * Copyright (C) 2000 Kazumoto Kojima 6 * Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp> 7 * Copyright (C) 2006 Paul Mundt 8 * 9 * Supported system: 10 * On-chip supporting modules (TMU, RTC, etc.). 11 * On-chip supporting modules for SH7709/SH7709A/SH7729. 12 * Hitachi SolutionEngine external I/O: 13 * MS7709SE01, MS7709ASE01, and MS7750SE01 14 * 15 * This file is subject to the terms and conditions of the GNU General Public 16 * License. See the file "COPYING" in the main directory of this archive 17 * for more details. 18 */ 19 #include <linux/init.h> 20 #include <linux/interrupt.h> 21 #include <linux/io.h> 22 #include <linux/irq.h> 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <linux/topology.h> 26 27 static inline struct ipr_desc *get_ipr_desc(struct irq_data *data) 28 { 29 struct irq_chip *chip = irq_data_get_irq_chip(data); 30 return container_of(chip, struct ipr_desc, chip); 31 } 32 33 static void disable_ipr_irq(struct irq_data *data) 34 { 35 struct ipr_data *p = irq_data_get_irq_chip_data(data); 36 unsigned long addr = get_ipr_desc(data)->ipr_offsets[p->ipr_idx]; 37 /* Set the priority in IPR to 0 */ 38 __raw_writew(__raw_readw(addr) & (0xffff ^ (0xf << p->shift)), addr); 39 (void)__raw_readw(addr); /* Read back to flush write posting */ 40 } 41 42 static void enable_ipr_irq(struct irq_data *data) 43 { 44 struct ipr_data *p = irq_data_get_irq_chip_data(data); 45 unsigned long addr = get_ipr_desc(data)->ipr_offsets[p->ipr_idx]; 46 /* Set priority in IPR back to original value */ 47 __raw_writew(__raw_readw(addr) | (p->priority << p->shift), addr); 48 } 49 50 /* 51 * The shift value is now the number of bits to shift, not the number of 52 * bits/4. This is to make it easier to read the value directly from the 53 * datasheets. The IPR address is calculated using the ipr_offset table. 54 */ 55 void register_ipr_controller(struct ipr_desc *desc) 56 { 57 int i; 58 59 desc->chip.irq_mask = disable_ipr_irq; 60 desc->chip.irq_unmask = enable_ipr_irq; 61 62 for (i = 0; i < desc->nr_irqs; i++) { 63 struct ipr_data *p = desc->ipr_data + i; 64 int res; 65 66 BUG_ON(p->ipr_idx >= desc->nr_offsets); 67 BUG_ON(!desc->ipr_offsets[p->ipr_idx]); 68 69 res = irq_alloc_desc_at(p->irq, numa_node_id()); 70 if (unlikely(res != p->irq && res != -EEXIST)) { 71 printk(KERN_INFO "can not get irq_desc for %d\n", 72 p->irq); 73 continue; 74 } 75 76 disable_irq_nosync(p->irq); 77 irq_set_chip_and_handler_name(p->irq, &desc->chip, 78 handle_level_irq, "level"); 79 irq_set_chip_data(p->irq, p); 80 disable_ipr_irq(irq_get_irq_data(p->irq)); 81 } 82 } 83 EXPORT_SYMBOL(register_ipr_controller); 84