1 /* 2 * intc-simr.c 3 * 4 * Interrupt controller code for the ColdFire 5208, 5207 & 532x parts. 5 * 6 * (C) Copyright 2009-2011, Greg Ungerer <gerg@snapgear.com> 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file COPYING in the main directory of this archive 10 * for more details. 11 */ 12 13 #include <linux/types.h> 14 #include <linux/init.h> 15 #include <linux/kernel.h> 16 #include <linux/interrupt.h> 17 #include <linux/irq.h> 18 #include <linux/io.h> 19 #include <asm/coldfire.h> 20 #include <asm/mcfsim.h> 21 #include <asm/traps.h> 22 23 /* 24 * The EDGE Port interrupts are the fixed 7 external interrupts. 25 * They need some special treatment, for example they need to be acked. 26 */ 27 #ifdef CONFIG_M520x 28 /* 29 * The 520x parts only support a limited range of these external 30 * interrupts, only 1, 4 and 7 (as interrupts 65, 66 and 67). 31 */ 32 #define EINT0 64 /* Is not actually used, but spot reserved for it */ 33 #define EINT1 65 /* EDGE Port interrupt 1 */ 34 #define EINT4 66 /* EDGE Port interrupt 4 */ 35 #define EINT7 67 /* EDGE Port interrupt 7 */ 36 37 static unsigned int irqebitmap[] = { 0, 1, 4, 7 }; 38 static inline unsigned int irq2ebit(unsigned int irq) 39 { 40 return irqebitmap[irq - EINT0]; 41 } 42 43 #else 44 45 /* 46 * Most of the ColdFire parts with the EDGE Port module just have 47 * a strait direct mapping of the 7 external interrupts. Although 48 * there is a bit reserved for 0, it is not used. 49 */ 50 #define EINT0 64 /* Is not actually used, but spot reserved for it */ 51 #define EINT1 65 /* EDGE Port interrupt 1 */ 52 #define EINT7 71 /* EDGE Port interrupt 7 */ 53 54 static inline unsigned int irq2ebit(unsigned int irq) 55 { 56 return irq - EINT0; 57 } 58 59 #endif 60 61 /* 62 * There maybe one, two or three interrupt control units, each has 64 63 * interrupts. If there is no second or third unit then MCFINTC1_* or 64 * MCFINTC2_* defines will be 0 (and code for them optimized away). 65 */ 66 67 static void intc_irq_mask(struct irq_data *d) 68 { 69 unsigned int irq = d->irq - MCFINT_VECBASE; 70 71 if (MCFINTC2_SIMR && (irq > 127)) 72 __raw_writeb(irq - 128, MCFINTC2_SIMR); 73 else if (MCFINTC1_SIMR && (irq > 63)) 74 __raw_writeb(irq - 64, MCFINTC1_SIMR); 75 else 76 __raw_writeb(irq, MCFINTC0_SIMR); 77 } 78 79 static void intc_irq_unmask(struct irq_data *d) 80 { 81 unsigned int irq = d->irq - MCFINT_VECBASE; 82 83 if (MCFINTC2_CIMR && (irq > 127)) 84 __raw_writeb(irq - 128, MCFINTC2_CIMR); 85 else if (MCFINTC1_CIMR && (irq > 63)) 86 __raw_writeb(irq - 64, MCFINTC1_CIMR); 87 else 88 __raw_writeb(irq, MCFINTC0_CIMR); 89 } 90 91 static void intc_irq_ack(struct irq_data *d) 92 { 93 unsigned int ebit = irq2ebit(d->irq); 94 95 __raw_writeb(0x1 << ebit, MCFEPORT_EPFR); 96 } 97 98 static unsigned int intc_irq_startup(struct irq_data *d) 99 { 100 unsigned int irq = d->irq; 101 102 if ((irq >= EINT1) && (irq <= EINT7)) { 103 unsigned int ebit = irq2ebit(irq); 104 u8 v; 105 106 #if defined(MCFEPORT_EPDDR) 107 /* Set EPORT line as input */ 108 v = __raw_readb(MCFEPORT_EPDDR); 109 __raw_writeb(v & ~(0x1 << ebit), MCFEPORT_EPDDR); 110 #endif 111 112 /* Set EPORT line as interrupt source */ 113 v = __raw_readb(MCFEPORT_EPIER); 114 __raw_writeb(v | (0x1 << ebit), MCFEPORT_EPIER); 115 } 116 117 irq -= MCFINT_VECBASE; 118 if (MCFINTC2_ICR0 && (irq > 127)) 119 __raw_writeb(5, MCFINTC2_ICR0 + irq - 128); 120 else if (MCFINTC1_ICR0 && (irq > 63)) 121 __raw_writeb(5, MCFINTC1_ICR0 + irq - 64); 122 else 123 __raw_writeb(5, MCFINTC0_ICR0 + irq); 124 125 intc_irq_unmask(d); 126 return 0; 127 } 128 129 static int intc_irq_set_type(struct irq_data *d, unsigned int type) 130 { 131 unsigned int ebit, irq = d->irq; 132 u16 pa, tb; 133 134 switch (type) { 135 case IRQ_TYPE_EDGE_RISING: 136 tb = 0x1; 137 break; 138 case IRQ_TYPE_EDGE_FALLING: 139 tb = 0x2; 140 break; 141 case IRQ_TYPE_EDGE_BOTH: 142 tb = 0x3; 143 break; 144 default: 145 /* Level triggered */ 146 tb = 0; 147 break; 148 } 149 150 if (tb) 151 irq_set_handler(irq, handle_edge_irq); 152 153 ebit = irq2ebit(irq) * 2; 154 pa = __raw_readw(MCFEPORT_EPPAR); 155 pa = (pa & ~(0x3 << ebit)) | (tb << ebit); 156 __raw_writew(pa, MCFEPORT_EPPAR); 157 158 return 0; 159 } 160 161 static struct irq_chip intc_irq_chip = { 162 .name = "CF-INTC", 163 .irq_startup = intc_irq_startup, 164 .irq_mask = intc_irq_mask, 165 .irq_unmask = intc_irq_unmask, 166 }; 167 168 static struct irq_chip intc_irq_chip_edge_port = { 169 .name = "CF-INTC-EP", 170 .irq_startup = intc_irq_startup, 171 .irq_mask = intc_irq_mask, 172 .irq_unmask = intc_irq_unmask, 173 .irq_ack = intc_irq_ack, 174 .irq_set_type = intc_irq_set_type, 175 }; 176 177 void __init init_IRQ(void) 178 { 179 int irq, eirq; 180 181 /* Mask all interrupt sources */ 182 __raw_writeb(0xff, MCFINTC0_SIMR); 183 if (MCFINTC1_SIMR) 184 __raw_writeb(0xff, MCFINTC1_SIMR); 185 if (MCFINTC2_SIMR) 186 __raw_writeb(0xff, MCFINTC2_SIMR); 187 188 eirq = MCFINT_VECBASE + 64 + (MCFINTC1_ICR0 ? 64 : 0) + 189 (MCFINTC2_ICR0 ? 64 : 0); 190 for (irq = MCFINT_VECBASE; (irq < eirq); irq++) { 191 if ((irq >= EINT1) && (irq <= EINT7)) 192 irq_set_chip(irq, &intc_irq_chip_edge_port); 193 else 194 irq_set_chip(irq, &intc_irq_chip); 195 irq_set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH); 196 irq_set_handler(irq, handle_level_irq); 197 } 198 } 199 200