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