1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/arm/mach-pxa/irq.c 4 * 5 * Generic PXA IRQ handling 6 * 7 * Author: Nicolas Pitre 8 * Created: Jun 15, 2001 9 * Copyright: MontaVista Software Inc. 10 */ 11 #include <linux/bitops.h> 12 #include <linux/init.h> 13 #include <linux/module.h> 14 #include <linux/interrupt.h> 15 #include <linux/syscore_ops.h> 16 #include <linux/io.h> 17 #include <linux/irq.h> 18 #include <linux/of_address.h> 19 #include <linux/of_irq.h> 20 #include <linux/soc/pxa/cpu.h> 21 22 #include <asm/exception.h> 23 24 #include "irqs.h" 25 26 #include "generic.h" 27 #include "pxa-regs.h" 28 29 #define ICIP (0x000) 30 #define ICMR (0x004) 31 #define ICLR (0x008) 32 #define ICFR (0x00c) 33 #define ICPR (0x010) 34 #define ICCR (0x014) 35 #define ICHP (0x018) 36 #define IPR(i) (((i) < 32) ? (0x01c + ((i) << 2)) : \ 37 ((i) < 64) ? (0x0b0 + (((i) - 32) << 2)) : \ 38 (0x144 + (((i) - 64) << 2))) 39 #define ICHP_VAL_IRQ (1 << 31) 40 #define ICHP_IRQ(i) (((i) >> 16) & 0x7fff) 41 #define IPR_VALID (1 << 31) 42 43 #define MAX_INTERNAL_IRQS 128 44 45 /* 46 * This is for peripheral IRQs internal to the PXA chip. 47 */ 48 49 static void __iomem *pxa_irq_base; 50 static int pxa_internal_irq_nr; 51 static bool cpu_has_ipr; 52 static struct irq_domain *pxa_irq_domain; 53 54 static inline void __iomem *irq_base(int i) 55 { 56 static unsigned long phys_base_offset[] = { 57 0x0, 58 0x9c, 59 0x130, 60 }; 61 62 return pxa_irq_base + phys_base_offset[i]; 63 } 64 65 void pxa_mask_irq(struct irq_data *d) 66 { 67 void __iomem *base = irq_data_get_irq_chip_data(d); 68 irq_hw_number_t irq = irqd_to_hwirq(d); 69 uint32_t icmr = __raw_readl(base + ICMR); 70 71 icmr &= ~BIT(irq & 0x1f); 72 __raw_writel(icmr, base + ICMR); 73 } 74 75 void pxa_unmask_irq(struct irq_data *d) 76 { 77 void __iomem *base = irq_data_get_irq_chip_data(d); 78 irq_hw_number_t irq = irqd_to_hwirq(d); 79 uint32_t icmr = __raw_readl(base + ICMR); 80 81 icmr |= BIT(irq & 0x1f); 82 __raw_writel(icmr, base + ICMR); 83 } 84 85 static struct irq_chip pxa_internal_irq_chip = { 86 .name = "SC", 87 .irq_ack = pxa_mask_irq, 88 .irq_mask = pxa_mask_irq, 89 .irq_unmask = pxa_unmask_irq, 90 }; 91 92 asmlinkage void __exception_irq_entry icip_handle_irq(struct pt_regs *regs) 93 { 94 uint32_t icip, icmr, mask; 95 96 do { 97 icip = __raw_readl(pxa_irq_base + ICIP); 98 icmr = __raw_readl(pxa_irq_base + ICMR); 99 mask = icip & icmr; 100 101 if (mask == 0) 102 break; 103 104 handle_IRQ(PXA_IRQ(fls(mask) - 1), regs); 105 } while (1); 106 } 107 108 asmlinkage void __exception_irq_entry ichp_handle_irq(struct pt_regs *regs) 109 { 110 uint32_t ichp; 111 112 do { 113 __asm__ __volatile__("mrc p6, 0, %0, c5, c0, 0\n": "=r"(ichp)); 114 115 if ((ichp & ICHP_VAL_IRQ) == 0) 116 break; 117 118 handle_IRQ(PXA_IRQ(ICHP_IRQ(ichp)), regs); 119 } while (1); 120 } 121 122 static int pxa_irq_map(struct irq_domain *h, unsigned int virq, 123 irq_hw_number_t hw) 124 { 125 void __iomem *base = irq_base(hw / 32); 126 127 /* initialize interrupt priority */ 128 if (cpu_has_ipr) 129 __raw_writel(hw | IPR_VALID, pxa_irq_base + IPR(hw)); 130 131 irq_set_chip_and_handler(virq, &pxa_internal_irq_chip, 132 handle_level_irq); 133 irq_set_chip_data(virq, base); 134 135 return 0; 136 } 137 138 static const struct irq_domain_ops pxa_irq_ops = { 139 .map = pxa_irq_map, 140 .xlate = irq_domain_xlate_onecell, 141 }; 142 143 static __init void 144 pxa_init_irq_common(struct device_node *node, int irq_nr, 145 int (*fn)(struct irq_data *, unsigned int)) 146 { 147 int n; 148 149 pxa_internal_irq_nr = irq_nr; 150 pxa_irq_domain = irq_domain_add_legacy(node, irq_nr, 151 PXA_IRQ(0), 0, 152 &pxa_irq_ops, NULL); 153 if (!pxa_irq_domain) 154 panic("Unable to add PXA IRQ domain\n"); 155 irq_set_default_host(pxa_irq_domain); 156 157 for (n = 0; n < irq_nr; n += 32) { 158 void __iomem *base = irq_base(n >> 5); 159 160 __raw_writel(0, base + ICMR); /* disable all IRQs */ 161 __raw_writel(0, base + ICLR); /* all IRQs are IRQ, not FIQ */ 162 } 163 /* only unmasked interrupts kick us out of idle */ 164 __raw_writel(1, irq_base(0) + ICCR); 165 166 pxa_internal_irq_chip.irq_set_wake = fn; 167 } 168 169 void __init pxa_init_irq(int irq_nr, int (*fn)(struct irq_data *, unsigned int)) 170 { 171 BUG_ON(irq_nr > MAX_INTERNAL_IRQS); 172 173 pxa_irq_base = io_p2v(0x40d00000); 174 cpu_has_ipr = !cpu_is_pxa25x(); 175 pxa_init_irq_common(NULL, irq_nr, fn); 176 } 177 178 #ifdef CONFIG_PM 179 static unsigned long saved_icmr[MAX_INTERNAL_IRQS/32]; 180 static unsigned long saved_ipr[MAX_INTERNAL_IRQS]; 181 182 static int pxa_irq_suspend(void) 183 { 184 int i; 185 186 for (i = 0; i < DIV_ROUND_UP(pxa_internal_irq_nr, 32); i++) { 187 void __iomem *base = irq_base(i); 188 189 saved_icmr[i] = __raw_readl(base + ICMR); 190 __raw_writel(0, base + ICMR); 191 } 192 193 if (cpu_has_ipr) { 194 for (i = 0; i < pxa_internal_irq_nr; i++) 195 saved_ipr[i] = __raw_readl(pxa_irq_base + IPR(i)); 196 } 197 198 return 0; 199 } 200 201 static void pxa_irq_resume(void) 202 { 203 int i; 204 205 for (i = 0; i < DIV_ROUND_UP(pxa_internal_irq_nr, 32); i++) { 206 void __iomem *base = irq_base(i); 207 208 __raw_writel(saved_icmr[i], base + ICMR); 209 __raw_writel(0, base + ICLR); 210 } 211 212 if (cpu_has_ipr) 213 for (i = 0; i < pxa_internal_irq_nr; i++) 214 __raw_writel(saved_ipr[i], pxa_irq_base + IPR(i)); 215 216 __raw_writel(1, pxa_irq_base + ICCR); 217 } 218 #else 219 #define pxa_irq_suspend NULL 220 #define pxa_irq_resume NULL 221 #endif 222 223 struct syscore_ops pxa_irq_syscore_ops = { 224 .suspend = pxa_irq_suspend, 225 .resume = pxa_irq_resume, 226 }; 227 228 #ifdef CONFIG_OF 229 static const struct of_device_id intc_ids[] __initconst = { 230 { .compatible = "marvell,pxa-intc", }, 231 {} 232 }; 233 234 void __init pxa_dt_irq_init(int (*fn)(struct irq_data *, unsigned int)) 235 { 236 struct device_node *node; 237 struct resource res; 238 int ret; 239 240 node = of_find_matching_node(NULL, intc_ids); 241 if (!node) { 242 pr_err("Failed to find interrupt controller in arch-pxa\n"); 243 return; 244 } 245 246 ret = of_property_read_u32(node, "marvell,intc-nr-irqs", 247 &pxa_internal_irq_nr); 248 if (ret) { 249 pr_err("Not found marvell,intc-nr-irqs property\n"); 250 return; 251 } 252 253 ret = of_address_to_resource(node, 0, &res); 254 if (ret < 0) { 255 pr_err("No registers defined for node\n"); 256 return; 257 } 258 pxa_irq_base = io_p2v(res.start); 259 260 if (of_find_property(node, "marvell,intc-priority", NULL)) 261 cpu_has_ipr = 1; 262 263 ret = irq_alloc_descs(-1, 0, pxa_internal_irq_nr, 0); 264 if (ret < 0) { 265 pr_err("Failed to allocate IRQ numbers\n"); 266 return; 267 } 268 269 pxa_init_irq_common(node, pxa_internal_irq_nr, fn); 270 } 271 #endif /* CONFIG_OF */ 272