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/irq.h> 21 #include <linux/module.h> 22 #include <linux/io.h> 23 #include <linux/interrupt.h> 24 25 static inline struct ipr_desc *get_ipr_desc(unsigned int irq) 26 { 27 struct irq_chip *chip = get_irq_chip(irq); 28 return (void *)((char *)chip - offsetof(struct ipr_desc, chip)); 29 } 30 31 static void disable_ipr_irq(unsigned int irq) 32 { 33 struct ipr_data *p = get_irq_chip_data(irq); 34 unsigned long addr = get_ipr_desc(irq)->ipr_offsets[p->ipr_idx]; 35 /* Set the priority in IPR to 0 */ 36 ctrl_outw(ctrl_inw(addr) & (0xffff ^ (0xf << p->shift)), addr); 37 } 38 39 static void enable_ipr_irq(unsigned int irq) 40 { 41 struct ipr_data *p = get_irq_chip_data(irq); 42 unsigned long addr = get_ipr_desc(irq)->ipr_offsets[p->ipr_idx]; 43 /* Set priority in IPR back to original value */ 44 ctrl_outw(ctrl_inw(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.mask = disable_ipr_irq; 57 desc->chip.unmask = enable_ipr_irq; 58 desc->chip.mask_ack = disable_ipr_irq; 59 60 for (i = 0; i < desc->nr_irqs; i++) { 61 struct ipr_data *p = desc->ipr_data + i; 62 63 BUG_ON(p->ipr_idx >= desc->nr_offsets); 64 BUG_ON(!desc->ipr_offsets[p->ipr_idx]); 65 66 disable_irq_nosync(p->irq); 67 set_irq_chip_and_handler_name(p->irq, &desc->chip, 68 handle_level_irq, "level"); 69 set_irq_chip_data(p->irq, p); 70 disable_ipr_irq(p->irq); 71 } 72 } 73 EXPORT_SYMBOL(register_ipr_controller); 74