1 /* 2 * Based on linux/arch/mips/jmr3927/rbhma3100/irq.c, 3 * linux/arch/mips/tx4927/common/tx4927_irq.c, 4 * linux/arch/mips/tx4938/common/irq.c 5 * 6 * Copyright 2001, 2003-2005 MontaVista Software Inc. 7 * Author: MontaVista Software, Inc. 8 * ahennessy@mvista.com 9 * source@mvista.com 10 * Copyright (C) 2000-2001 Toshiba Corporation 11 * 12 * This file is subject to the terms and conditions of the GNU General Public 13 * License. See the file "COPYING" in the main directory of this archive 14 * for more details. 15 */ 16 #include <linux/init.h> 17 #include <linux/interrupt.h> 18 #include <linux/types.h> 19 #include <asm/txx9irq.h> 20 21 struct txx9_irc_reg { 22 u32 cer; 23 u32 cr[2]; 24 u32 unused0; 25 u32 ilr[8]; 26 u32 unused1[4]; 27 u32 imr; 28 u32 unused2[7]; 29 u32 scr; 30 u32 unused3[7]; 31 u32 ssr; 32 u32 unused4[7]; 33 u32 csr; 34 }; 35 36 /* IRCER : Int. Control Enable */ 37 #define TXx9_IRCER_ICE 0x00000001 38 39 /* IRCR : Int. Control */ 40 #define TXx9_IRCR_LOW 0x00000000 41 #define TXx9_IRCR_HIGH 0x00000001 42 #define TXx9_IRCR_DOWN 0x00000002 43 #define TXx9_IRCR_UP 0x00000003 44 #define TXx9_IRCR_EDGE(cr) ((cr) & 0x00000002) 45 46 /* IRSCR : Int. Status Control */ 47 #define TXx9_IRSCR_EIClrE 0x00000100 48 #define TXx9_IRSCR_EIClr_MASK 0x0000000f 49 50 /* IRCSR : Int. Current Status */ 51 #define TXx9_IRCSR_IF 0x00010000 52 #define TXx9_IRCSR_ILV_MASK 0x00000700 53 #define TXx9_IRCSR_IVL_MASK 0x0000001f 54 55 #define irc_dlevel 0 56 #define irc_elevel 1 57 58 static struct txx9_irc_reg __iomem *txx9_ircptr __read_mostly; 59 60 static struct { 61 unsigned char level; 62 unsigned char mode; 63 } txx9irq[TXx9_MAX_IR] __read_mostly; 64 65 static void txx9_irq_unmask(unsigned int irq) 66 { 67 unsigned int irq_nr = irq - TXX9_IRQ_BASE; 68 u32 __iomem *ilrp = &txx9_ircptr->ilr[(irq_nr % 16 ) / 2]; 69 int ofs = irq_nr / 16 * 16 + (irq_nr & 1) * 8; 70 71 __raw_writel((__raw_readl(ilrp) & ~(0xff << ofs)) 72 | (txx9irq[irq_nr].level << ofs), 73 ilrp); 74 #ifdef CONFIG_CPU_TX39XX 75 /* update IRCSR */ 76 __raw_writel(0, &txx9_ircptr->imr); 77 __raw_writel(irc_elevel, &txx9_ircptr->imr); 78 #endif 79 } 80 81 static inline void txx9_irq_mask(unsigned int irq) 82 { 83 unsigned int irq_nr = irq - TXX9_IRQ_BASE; 84 u32 __iomem *ilrp = &txx9_ircptr->ilr[(irq_nr % 16) / 2]; 85 int ofs = irq_nr / 16 * 16 + (irq_nr & 1) * 8; 86 87 __raw_writel((__raw_readl(ilrp) & ~(0xff << ofs)) 88 | (irc_dlevel << ofs), 89 ilrp); 90 #ifdef CONFIG_CPU_TX39XX 91 /* update IRCSR */ 92 __raw_writel(0, &txx9_ircptr->imr); 93 __raw_writel(irc_elevel, &txx9_ircptr->imr); 94 /* flush write buffer */ 95 __raw_readl(&txx9_ircptr->ssr); 96 #else 97 mmiowb(); 98 #endif 99 } 100 101 static void txx9_irq_mask_ack(unsigned int irq) 102 { 103 unsigned int irq_nr = irq - TXX9_IRQ_BASE; 104 105 txx9_irq_mask(irq); 106 /* clear edge detection */ 107 if (unlikely(TXx9_IRCR_EDGE(txx9irq[irq_nr].mode))) 108 __raw_writel(TXx9_IRSCR_EIClrE | irq_nr, &txx9_ircptr->scr); 109 } 110 111 static int txx9_irq_set_type(unsigned int irq, unsigned int flow_type) 112 { 113 unsigned int irq_nr = irq - TXX9_IRQ_BASE; 114 u32 cr; 115 u32 __iomem *crp; 116 int ofs; 117 int mode; 118 119 if (flow_type & IRQF_TRIGGER_PROBE) 120 return 0; 121 switch (flow_type & IRQF_TRIGGER_MASK) { 122 case IRQF_TRIGGER_RISING: mode = TXx9_IRCR_UP; break; 123 case IRQF_TRIGGER_FALLING: mode = TXx9_IRCR_DOWN; break; 124 case IRQF_TRIGGER_HIGH: mode = TXx9_IRCR_HIGH; break; 125 case IRQF_TRIGGER_LOW: mode = TXx9_IRCR_LOW; break; 126 default: 127 return -EINVAL; 128 } 129 crp = &txx9_ircptr->cr[(unsigned int)irq_nr / 8]; 130 cr = __raw_readl(crp); 131 ofs = (irq_nr & (8 - 1)) * 2; 132 cr &= ~(0x3 << ofs); 133 cr |= (mode & 0x3) << ofs; 134 __raw_writel(cr, crp); 135 txx9irq[irq_nr].mode = mode; 136 return 0; 137 } 138 139 static struct irq_chip txx9_irq_chip = { 140 .name = "TXX9", 141 .ack = txx9_irq_mask_ack, 142 .mask = txx9_irq_mask, 143 .mask_ack = txx9_irq_mask_ack, 144 .unmask = txx9_irq_unmask, 145 .set_type = txx9_irq_set_type, 146 }; 147 148 void __init txx9_irq_init(unsigned long baseaddr) 149 { 150 int i; 151 152 txx9_ircptr = ioremap(baseaddr, sizeof(struct txx9_irc_reg)); 153 for (i = 0; i < TXx9_MAX_IR; i++) { 154 txx9irq[i].level = 4; /* middle level */ 155 txx9irq[i].mode = TXx9_IRCR_LOW; 156 set_irq_chip_and_handler(TXX9_IRQ_BASE + i, 157 &txx9_irq_chip, handle_level_irq); 158 } 159 160 /* mask all IRC interrupts */ 161 __raw_writel(0, &txx9_ircptr->imr); 162 for (i = 0; i < 8; i++) 163 __raw_writel(0, &txx9_ircptr->ilr[i]); 164 /* setup IRC interrupt mode (Low Active) */ 165 for (i = 0; i < 2; i++) 166 __raw_writel(0, &txx9_ircptr->cr[i]); 167 /* enable interrupt control */ 168 __raw_writel(TXx9_IRCER_ICE, &txx9_ircptr->cer); 169 __raw_writel(irc_elevel, &txx9_ircptr->imr); 170 } 171 172 int __init txx9_irq_set_pri(int irc_irq, int new_pri) 173 { 174 int old_pri; 175 176 if ((unsigned int)irc_irq >= TXx9_MAX_IR) 177 return 0; 178 old_pri = txx9irq[irc_irq].level; 179 txx9irq[irc_irq].level = new_pri; 180 return old_pri; 181 } 182 183 int txx9_irq(void) 184 { 185 u32 csr = __raw_readl(&txx9_ircptr->csr); 186 187 if (likely(!(csr & TXx9_IRCSR_IF))) 188 return TXX9_IRQ_BASE + (csr & (TXx9_MAX_IR - 1)); 189 return -1; 190 } 191