1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved. 4 * Copyright (C) 2014 Oleksij Rempel <linux@rempel-privat.de> 5 * Add Alphascale ASM9260 support. 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/init.h> 10 #include <linux/irq.h> 11 #include <linux/irqchip.h> 12 #include <linux/irqdomain.h> 13 #include <linux/io.h> 14 #include <linux/of.h> 15 #include <linux/of_address.h> 16 #include <linux/of_irq.h> 17 #include <linux/stmp_device.h> 18 #include <asm/exception.h> 19 20 #include "alphascale_asm9260-icoll.h" 21 22 /* 23 * this device provide 4 offsets for each register: 24 * 0x0 - plain read write mode 25 * 0x4 - set mode, OR logic. 26 * 0x8 - clr mode, XOR logic. 27 * 0xc - togle mode. 28 */ 29 #define SET_REG 4 30 #define CLR_REG 8 31 32 #define HW_ICOLL_VECTOR 0x0000 33 #define HW_ICOLL_LEVELACK 0x0010 34 #define HW_ICOLL_CTRL 0x0020 35 #define HW_ICOLL_STAT_OFFSET 0x0070 36 #define HW_ICOLL_INTERRUPT0 0x0120 37 #define HW_ICOLL_INTERRUPTn(n) ((n) * 0x10) 38 #define BM_ICOLL_INTR_ENABLE BIT(2) 39 #define BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0 0x1 40 41 #define ICOLL_NUM_IRQS 128 42 43 enum icoll_type { 44 ICOLL, 45 ASM9260_ICOLL, 46 }; 47 48 struct icoll_priv { 49 void __iomem *vector; 50 void __iomem *levelack; 51 void __iomem *ctrl; 52 void __iomem *stat; 53 void __iomem *intr; 54 void __iomem *clear; 55 enum icoll_type type; 56 }; 57 58 static struct icoll_priv icoll_priv; 59 static struct irq_domain *icoll_domain; 60 61 /* calculate bit offset depending on number of interrupt per register */ 62 static u32 icoll_intr_bitshift(struct irq_data *d, u32 bit) 63 { 64 /* 65 * mask lower part of hwirq to convert it 66 * in 0, 1, 2 or 3 and then multiply it by 8 (or shift by 3) 67 */ 68 return bit << ((d->hwirq & 3) << 3); 69 } 70 71 /* calculate mem offset depending on number of interrupt per register */ 72 static void __iomem *icoll_intr_reg(struct irq_data *d) 73 { 74 /* offset = hwirq / intr_per_reg * 0x10 */ 75 return icoll_priv.intr + ((d->hwirq >> 2) * 0x10); 76 } 77 78 static void icoll_ack_irq(struct irq_data *d) 79 { 80 /* 81 * The Interrupt Collector is able to prioritize irqs. 82 * Currently only level 0 is used. So acking can use 83 * BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0 unconditionally. 84 */ 85 __raw_writel(BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0, 86 icoll_priv.levelack); 87 } 88 89 static void icoll_mask_irq(struct irq_data *d) 90 { 91 __raw_writel(BM_ICOLL_INTR_ENABLE, 92 icoll_priv.intr + CLR_REG + HW_ICOLL_INTERRUPTn(d->hwirq)); 93 } 94 95 static void icoll_unmask_irq(struct irq_data *d) 96 { 97 __raw_writel(BM_ICOLL_INTR_ENABLE, 98 icoll_priv.intr + SET_REG + HW_ICOLL_INTERRUPTn(d->hwirq)); 99 } 100 101 static void asm9260_mask_irq(struct irq_data *d) 102 { 103 __raw_writel(icoll_intr_bitshift(d, BM_ICOLL_INTR_ENABLE), 104 icoll_intr_reg(d) + CLR_REG); 105 } 106 107 static void asm9260_unmask_irq(struct irq_data *d) 108 { 109 __raw_writel(ASM9260_BM_CLEAR_BIT(d->hwirq), 110 icoll_priv.clear + 111 ASM9260_HW_ICOLL_CLEARn(d->hwirq)); 112 113 __raw_writel(icoll_intr_bitshift(d, BM_ICOLL_INTR_ENABLE), 114 icoll_intr_reg(d) + SET_REG); 115 } 116 117 static struct irq_chip mxs_icoll_chip = { 118 .irq_ack = icoll_ack_irq, 119 .irq_mask = icoll_mask_irq, 120 .irq_unmask = icoll_unmask_irq, 121 .flags = IRQCHIP_MASK_ON_SUSPEND | 122 IRQCHIP_SKIP_SET_WAKE, 123 }; 124 125 static struct irq_chip asm9260_icoll_chip = { 126 .irq_ack = icoll_ack_irq, 127 .irq_mask = asm9260_mask_irq, 128 .irq_unmask = asm9260_unmask_irq, 129 .flags = IRQCHIP_MASK_ON_SUSPEND | 130 IRQCHIP_SKIP_SET_WAKE, 131 }; 132 133 asmlinkage void __exception_irq_entry icoll_handle_irq(struct pt_regs *regs) 134 { 135 u32 irqnr; 136 137 irqnr = __raw_readl(icoll_priv.stat); 138 __raw_writel(irqnr, icoll_priv.vector); 139 handle_domain_irq(icoll_domain, irqnr, regs); 140 } 141 142 static int icoll_irq_domain_map(struct irq_domain *d, unsigned int virq, 143 irq_hw_number_t hw) 144 { 145 struct irq_chip *chip; 146 147 if (icoll_priv.type == ICOLL) 148 chip = &mxs_icoll_chip; 149 else 150 chip = &asm9260_icoll_chip; 151 152 irq_set_chip_and_handler(virq, chip, handle_level_irq); 153 154 return 0; 155 } 156 157 static const struct irq_domain_ops icoll_irq_domain_ops = { 158 .map = icoll_irq_domain_map, 159 .xlate = irq_domain_xlate_onecell, 160 }; 161 162 static void __init icoll_add_domain(struct device_node *np, 163 int num) 164 { 165 icoll_domain = irq_domain_add_linear(np, num, 166 &icoll_irq_domain_ops, NULL); 167 168 if (!icoll_domain) 169 panic("%pOF: unable to create irq domain", np); 170 } 171 172 static void __iomem * __init icoll_init_iobase(struct device_node *np) 173 { 174 void __iomem *icoll_base; 175 176 icoll_base = of_io_request_and_map(np, 0, np->name); 177 if (IS_ERR(icoll_base)) 178 panic("%pOF: unable to map resource", np); 179 return icoll_base; 180 } 181 182 static int __init icoll_of_init(struct device_node *np, 183 struct device_node *interrupt_parent) 184 { 185 void __iomem *icoll_base; 186 187 icoll_priv.type = ICOLL; 188 189 icoll_base = icoll_init_iobase(np); 190 icoll_priv.vector = icoll_base + HW_ICOLL_VECTOR; 191 icoll_priv.levelack = icoll_base + HW_ICOLL_LEVELACK; 192 icoll_priv.ctrl = icoll_base + HW_ICOLL_CTRL; 193 icoll_priv.stat = icoll_base + HW_ICOLL_STAT_OFFSET; 194 icoll_priv.intr = icoll_base + HW_ICOLL_INTERRUPT0; 195 icoll_priv.clear = NULL; 196 197 /* 198 * Interrupt Collector reset, which initializes the priority 199 * for each irq to level 0. 200 */ 201 stmp_reset_block(icoll_priv.ctrl); 202 203 icoll_add_domain(np, ICOLL_NUM_IRQS); 204 205 return 0; 206 } 207 IRQCHIP_DECLARE(mxs, "fsl,icoll", icoll_of_init); 208 209 static int __init asm9260_of_init(struct device_node *np, 210 struct device_node *interrupt_parent) 211 { 212 void __iomem *icoll_base; 213 int i; 214 215 icoll_priv.type = ASM9260_ICOLL; 216 217 icoll_base = icoll_init_iobase(np); 218 icoll_priv.vector = icoll_base + ASM9260_HW_ICOLL_VECTOR; 219 icoll_priv.levelack = icoll_base + ASM9260_HW_ICOLL_LEVELACK; 220 icoll_priv.ctrl = icoll_base + ASM9260_HW_ICOLL_CTRL; 221 icoll_priv.stat = icoll_base + ASM9260_HW_ICOLL_STAT_OFFSET; 222 icoll_priv.intr = icoll_base + ASM9260_HW_ICOLL_INTERRUPT0; 223 icoll_priv.clear = icoll_base + ASM9260_HW_ICOLL_CLEAR0; 224 225 writel_relaxed(ASM9260_BM_CTRL_IRQ_ENABLE, 226 icoll_priv.ctrl); 227 /* 228 * ASM9260 don't provide reset bit. So, we need to set level 0 229 * manually. 230 */ 231 for (i = 0; i < 16 * 0x10; i += 0x10) 232 writel(0, icoll_priv.intr + i); 233 234 icoll_add_domain(np, ASM9260_NUM_IRQS); 235 set_handle_irq(icoll_handle_irq); 236 237 return 0; 238 } 239 IRQCHIP_DECLARE(asm9260, "alphascale,asm9260-icoll", asm9260_of_init); 240