1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. 4 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de 5 */ 6 7 #include <linux/module.h> 8 #include <linux/irq.h> 9 #include <linux/irqdomain.h> 10 #include <linux/irqchip.h> 11 #include <linux/io.h> 12 #include <linux/of.h> 13 #include <linux/of_address.h> 14 #include <asm/mach/irq.h> 15 #include <asm/exception.h> 16 17 #include "common.h" 18 #include "hardware.h" 19 #include "irq-common.h" 20 21 #define AVIC_INTCNTL 0x00 /* int control reg */ 22 #define AVIC_NIMASK 0x04 /* int mask reg */ 23 #define AVIC_INTENNUM 0x08 /* int enable number reg */ 24 #define AVIC_INTDISNUM 0x0C /* int disable number reg */ 25 #define AVIC_INTENABLEH 0x10 /* int enable reg high */ 26 #define AVIC_INTENABLEL 0x14 /* int enable reg low */ 27 #define AVIC_INTTYPEH 0x18 /* int type reg high */ 28 #define AVIC_INTTYPEL 0x1C /* int type reg low */ 29 #define AVIC_NIPRIORITY(x) (0x20 + 4 * (7 - (x))) /* int priority */ 30 #define AVIC_NIVECSR 0x40 /* norm int vector/status */ 31 #define AVIC_FIVECSR 0x44 /* fast int vector/status */ 32 #define AVIC_INTSRCH 0x48 /* int source reg high */ 33 #define AVIC_INTSRCL 0x4C /* int source reg low */ 34 #define AVIC_INTFRCH 0x50 /* int force reg high */ 35 #define AVIC_INTFRCL 0x54 /* int force reg low */ 36 #define AVIC_NIPNDH 0x58 /* norm int pending high */ 37 #define AVIC_NIPNDL 0x5C /* norm int pending low */ 38 #define AVIC_FIPNDH 0x60 /* fast int pending high */ 39 #define AVIC_FIPNDL 0x64 /* fast int pending low */ 40 41 #define AVIC_NUM_IRQS 64 42 43 /* low power interrupt mask registers */ 44 #define MX25_CCM_LPIMR0 0x68 45 #define MX25_CCM_LPIMR1 0x6C 46 47 static void __iomem *avic_base; 48 static void __iomem *mx25_ccm_base; 49 static struct irq_domain *domain; 50 51 #ifdef CONFIG_FIQ 52 static int avic_set_irq_fiq(unsigned int hwirq, unsigned int type) 53 { 54 unsigned int irqt; 55 56 if (hwirq >= AVIC_NUM_IRQS) 57 return -EINVAL; 58 59 if (hwirq < AVIC_NUM_IRQS / 2) { 60 irqt = imx_readl(avic_base + AVIC_INTTYPEL) & ~(1 << hwirq); 61 imx_writel(irqt | (!!type << hwirq), avic_base + AVIC_INTTYPEL); 62 } else { 63 hwirq -= AVIC_NUM_IRQS / 2; 64 irqt = imx_readl(avic_base + AVIC_INTTYPEH) & ~(1 << hwirq); 65 imx_writel(irqt | (!!type << hwirq), avic_base + AVIC_INTTYPEH); 66 } 67 68 return 0; 69 } 70 #endif /* CONFIG_FIQ */ 71 72 73 static struct mxc_extra_irq avic_extra_irq = { 74 #ifdef CONFIG_FIQ 75 .set_irq_fiq = avic_set_irq_fiq, 76 #endif 77 }; 78 79 #ifdef CONFIG_PM 80 static u32 avic_saved_mask_reg[2]; 81 82 static void avic_irq_suspend(struct irq_data *d) 83 { 84 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 85 struct irq_chip_type *ct = gc->chip_types; 86 int idx = d->hwirq >> 5; 87 88 avic_saved_mask_reg[idx] = imx_readl(avic_base + ct->regs.mask); 89 imx_writel(gc->wake_active, avic_base + ct->regs.mask); 90 91 if (mx25_ccm_base) { 92 u8 offs = d->hwirq < AVIC_NUM_IRQS / 2 ? 93 MX25_CCM_LPIMR0 : MX25_CCM_LPIMR1; 94 /* 95 * The interrupts which are still enabled will be used as wakeup 96 * sources. Allow those interrupts in low-power mode. 97 * The LPIMR registers use 0 to allow an interrupt, the AVIC 98 * registers use 1. 99 */ 100 imx_writel(~gc->wake_active, mx25_ccm_base + offs); 101 } 102 } 103 104 static void avic_irq_resume(struct irq_data *d) 105 { 106 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 107 struct irq_chip_type *ct = gc->chip_types; 108 int idx = d->hwirq >> 5; 109 110 imx_writel(avic_saved_mask_reg[idx], avic_base + ct->regs.mask); 111 112 if (mx25_ccm_base) { 113 u8 offs = d->hwirq < AVIC_NUM_IRQS / 2 ? 114 MX25_CCM_LPIMR0 : MX25_CCM_LPIMR1; 115 116 imx_writel(0xffffffff, mx25_ccm_base + offs); 117 } 118 } 119 120 #else 121 #define avic_irq_suspend NULL 122 #define avic_irq_resume NULL 123 #endif 124 125 static __init void avic_init_gc(int idx, unsigned int irq_start) 126 { 127 struct irq_chip_generic *gc; 128 struct irq_chip_type *ct; 129 130 gc = irq_alloc_generic_chip("mxc-avic", 1, irq_start, avic_base, 131 handle_level_irq); 132 gc->private = &avic_extra_irq; 133 gc->wake_enabled = IRQ_MSK(32); 134 135 ct = gc->chip_types; 136 ct->chip.irq_mask = irq_gc_mask_clr_bit; 137 ct->chip.irq_unmask = irq_gc_mask_set_bit; 138 ct->chip.irq_ack = irq_gc_mask_clr_bit; 139 ct->chip.irq_set_wake = irq_gc_set_wake; 140 ct->chip.irq_suspend = avic_irq_suspend; 141 ct->chip.irq_resume = avic_irq_resume; 142 ct->regs.mask = !idx ? AVIC_INTENABLEL : AVIC_INTENABLEH; 143 ct->regs.ack = ct->regs.mask; 144 145 irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0); 146 } 147 148 static void __exception_irq_entry avic_handle_irq(struct pt_regs *regs) 149 { 150 u32 nivector; 151 152 do { 153 nivector = imx_readl(avic_base + AVIC_NIVECSR) >> 16; 154 if (nivector == 0xffff) 155 break; 156 157 generic_handle_domain_irq(domain, nivector); 158 } while (1); 159 } 160 161 /* 162 * This function initializes the AVIC hardware and disables all the 163 * interrupts. It registers the interrupt enable and disable functions 164 * to the kernel for each interrupt source. 165 */ 166 static void __init mxc_init_irq(void __iomem *irqbase) 167 { 168 struct device_node *np; 169 int irq_base; 170 int i; 171 172 avic_base = irqbase; 173 174 np = of_find_compatible_node(NULL, NULL, "fsl,imx25-ccm"); 175 mx25_ccm_base = of_iomap(np, 0); 176 177 if (mx25_ccm_base) { 178 /* 179 * By default, we mask all interrupts. We set the actual mask 180 * before we go into low-power mode. 181 */ 182 imx_writel(0xffffffff, mx25_ccm_base + MX25_CCM_LPIMR0); 183 imx_writel(0xffffffff, mx25_ccm_base + MX25_CCM_LPIMR1); 184 } 185 186 /* put the AVIC into the reset value with 187 * all interrupts disabled 188 */ 189 imx_writel(0, avic_base + AVIC_INTCNTL); 190 imx_writel(0x1f, avic_base + AVIC_NIMASK); 191 192 /* disable all interrupts */ 193 imx_writel(0, avic_base + AVIC_INTENABLEH); 194 imx_writel(0, avic_base + AVIC_INTENABLEL); 195 196 /* all IRQ no FIQ */ 197 imx_writel(0, avic_base + AVIC_INTTYPEH); 198 imx_writel(0, avic_base + AVIC_INTTYPEL); 199 200 irq_base = irq_alloc_descs(-1, 0, AVIC_NUM_IRQS, numa_node_id()); 201 WARN_ON(irq_base < 0); 202 203 np = of_find_compatible_node(NULL, NULL, "fsl,avic"); 204 domain = irq_domain_add_legacy(np, AVIC_NUM_IRQS, irq_base, 0, 205 &irq_domain_simple_ops, NULL); 206 WARN_ON(!domain); 207 208 for (i = 0; i < AVIC_NUM_IRQS / 32; i++, irq_base += 32) 209 avic_init_gc(i, irq_base); 210 211 /* Set default priority value (0) for all IRQ's */ 212 for (i = 0; i < 8; i++) 213 imx_writel(0, avic_base + AVIC_NIPRIORITY(i)); 214 215 set_handle_irq(avic_handle_irq); 216 217 #ifdef CONFIG_FIQ 218 /* Initialize FIQ */ 219 init_FIQ(FIQ_START); 220 #endif 221 222 printk(KERN_INFO "MXC IRQ initialized\n"); 223 } 224 225 static int __init imx_avic_init(struct device_node *node, 226 struct device_node *parent) 227 { 228 void __iomem *avic_base; 229 230 avic_base = of_iomap(node, 0); 231 BUG_ON(!avic_base); 232 mxc_init_irq(avic_base); 233 return 0; 234 } 235 236 IRQCHIP_DECLARE(imx_avic, "fsl,avic", imx_avic_init); 237