Boris BREZILLON | b1479eb | 2014-07-10 19:14:18 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Atmel AT91 common AIC (Advanced Interrupt Controller) code shared by |
| 3 | * irq-atmel-aic and irq-atmel-aic5 drivers |
| 4 | * |
| 5 | * Copyright (C) 2004 SAN People |
| 6 | * Copyright (C) 2004 ATMEL |
| 7 | * Copyright (C) Rick Bronson |
| 8 | * Copyright (C) 2014 Free Electrons |
| 9 | * |
| 10 | * Author: Boris BREZILLON <boris.brezillon@free-electrons.com> |
| 11 | * |
| 12 | * This file is licensed under the terms of the GNU General Public |
| 13 | * License version 2. This program is licensed "as is" without any |
| 14 | * warranty of any kind, whether express or implied. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/errno.h> |
| 18 | #include <linux/io.h> |
| 19 | #include <linux/irq.h> |
| 20 | #include <linux/irqdomain.h> |
| 21 | #include <linux/of.h> |
| 22 | #include <linux/of_address.h> |
| 23 | #include <linux/slab.h> |
| 24 | |
| 25 | #include "irq-atmel-aic-common.h" |
| 26 | |
| 27 | #define AT91_AIC_PRIOR GENMASK(2, 0) |
| 28 | #define AT91_AIC_IRQ_MIN_PRIORITY 0 |
| 29 | #define AT91_AIC_IRQ_MAX_PRIORITY 7 |
| 30 | |
| 31 | #define AT91_AIC_SRCTYPE GENMASK(7, 6) |
| 32 | #define AT91_AIC_SRCTYPE_LOW (0 << 5) |
| 33 | #define AT91_AIC_SRCTYPE_FALLING (1 << 5) |
| 34 | #define AT91_AIC_SRCTYPE_HIGH (2 << 5) |
| 35 | #define AT91_AIC_SRCTYPE_RISING (3 << 5) |
| 36 | |
| 37 | struct aic_chip_data { |
| 38 | u32 ext_irqs; |
| 39 | }; |
| 40 | |
| 41 | static void aic_common_shutdown(struct irq_data *d) |
| 42 | { |
| 43 | struct irq_chip_type *ct = irq_data_get_chip_type(d); |
| 44 | |
| 45 | ct->chip.irq_mask(d); |
| 46 | } |
| 47 | |
| 48 | int aic_common_set_type(struct irq_data *d, unsigned type, unsigned *val) |
| 49 | { |
| 50 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); |
| 51 | struct aic_chip_data *aic = gc->private; |
| 52 | unsigned aic_type; |
| 53 | |
| 54 | switch (type) { |
| 55 | case IRQ_TYPE_LEVEL_HIGH: |
| 56 | aic_type = AT91_AIC_SRCTYPE_HIGH; |
| 57 | break; |
| 58 | case IRQ_TYPE_EDGE_RISING: |
| 59 | aic_type = AT91_AIC_SRCTYPE_RISING; |
| 60 | break; |
| 61 | case IRQ_TYPE_LEVEL_LOW: |
| 62 | if (!(d->mask & aic->ext_irqs)) |
| 63 | return -EINVAL; |
| 64 | |
| 65 | aic_type = AT91_AIC_SRCTYPE_LOW; |
| 66 | break; |
| 67 | case IRQ_TYPE_EDGE_FALLING: |
| 68 | if (!(d->mask & aic->ext_irqs)) |
| 69 | return -EINVAL; |
| 70 | |
| 71 | aic_type = AT91_AIC_SRCTYPE_FALLING; |
| 72 | break; |
| 73 | default: |
| 74 | return -EINVAL; |
| 75 | } |
| 76 | |
| 77 | *val &= AT91_AIC_SRCTYPE; |
| 78 | *val |= aic_type; |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | int aic_common_set_priority(int priority, unsigned *val) |
| 84 | { |
| 85 | if (priority < AT91_AIC_IRQ_MIN_PRIORITY || |
| 86 | priority > AT91_AIC_IRQ_MAX_PRIORITY) |
| 87 | return -EINVAL; |
| 88 | |
| 89 | *val &= AT91_AIC_PRIOR; |
| 90 | *val |= priority; |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | int aic_common_irq_domain_xlate(struct irq_domain *d, |
| 96 | struct device_node *ctrlr, |
| 97 | const u32 *intspec, |
| 98 | unsigned int intsize, |
| 99 | irq_hw_number_t *out_hwirq, |
| 100 | unsigned int *out_type) |
| 101 | { |
| 102 | if (WARN_ON(intsize < 3)) |
| 103 | return -EINVAL; |
| 104 | |
| 105 | if (WARN_ON((intspec[2] < AT91_AIC_IRQ_MIN_PRIORITY) || |
| 106 | (intspec[2] > AT91_AIC_IRQ_MAX_PRIORITY))) |
| 107 | return -EINVAL; |
| 108 | |
| 109 | *out_hwirq = intspec[0]; |
| 110 | *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static void __init aic_common_ext_irq_of_init(struct irq_domain *domain) |
| 116 | { |
| 117 | struct device_node *node = domain->of_node; |
| 118 | struct irq_chip_generic *gc; |
| 119 | struct aic_chip_data *aic; |
| 120 | struct property *prop; |
| 121 | const __be32 *p; |
| 122 | u32 hwirq; |
| 123 | |
| 124 | gc = irq_get_domain_generic_chip(domain, 0); |
| 125 | |
| 126 | aic = gc->private; |
| 127 | aic->ext_irqs |= 1; |
| 128 | |
| 129 | of_property_for_each_u32(node, "atmel,external-irqs", prop, p, hwirq) { |
| 130 | gc = irq_get_domain_generic_chip(domain, hwirq); |
| 131 | if (!gc) { |
| 132 | pr_warn("AIC: external irq %d >= %d skip it\n", |
| 133 | hwirq, domain->revmap_size); |
| 134 | continue; |
| 135 | } |
| 136 | |
| 137 | aic = gc->private; |
| 138 | aic->ext_irqs |= (1 << (hwirq % 32)); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | struct irq_domain *__init aic_common_of_init(struct device_node *node, |
| 143 | const struct irq_domain_ops *ops, |
| 144 | const char *name, int nirqs) |
| 145 | { |
| 146 | struct irq_chip_generic *gc; |
| 147 | struct irq_domain *domain; |
| 148 | struct aic_chip_data *aic; |
| 149 | void __iomem *reg_base; |
| 150 | int nchips; |
| 151 | int ret; |
| 152 | int i; |
| 153 | |
| 154 | nchips = DIV_ROUND_UP(nirqs, 32); |
| 155 | |
| 156 | reg_base = of_iomap(node, 0); |
| 157 | if (!reg_base) |
| 158 | return ERR_PTR(-ENOMEM); |
| 159 | |
| 160 | aic = kcalloc(nchips, sizeof(*aic), GFP_KERNEL); |
| 161 | if (!aic) { |
| 162 | ret = -ENOMEM; |
| 163 | goto err_iounmap; |
| 164 | } |
| 165 | |
| 166 | domain = irq_domain_add_linear(node, nchips * 32, ops, aic); |
| 167 | if (!domain) { |
| 168 | ret = -ENOMEM; |
| 169 | goto err_free_aic; |
| 170 | } |
| 171 | |
| 172 | ret = irq_alloc_domain_generic_chips(domain, 32, 1, name, |
| 173 | handle_level_irq, 0, 0, |
| 174 | IRQCHIP_SKIP_SET_WAKE); |
| 175 | if (ret) |
| 176 | goto err_domain_remove; |
| 177 | |
| 178 | for (i = 0; i < nchips; i++) { |
| 179 | gc = irq_get_domain_generic_chip(domain, i * 32); |
| 180 | |
| 181 | gc->reg_base = reg_base; |
| 182 | |
| 183 | gc->unused = 0; |
| 184 | gc->wake_enabled = ~0; |
| 185 | gc->chip_types[0].type = IRQ_TYPE_SENSE_MASK; |
| 186 | gc->chip_types[0].handler = handle_fasteoi_irq; |
| 187 | gc->chip_types[0].chip.irq_eoi = irq_gc_eoi; |
| 188 | gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake; |
| 189 | gc->chip_types[0].chip.irq_shutdown = aic_common_shutdown; |
| 190 | gc->private = &aic[i]; |
| 191 | } |
| 192 | |
| 193 | aic_common_ext_irq_of_init(domain); |
| 194 | |
| 195 | return domain; |
| 196 | |
| 197 | err_domain_remove: |
| 198 | irq_domain_remove(domain); |
| 199 | |
| 200 | err_free_aic: |
| 201 | kfree(aic); |
| 202 | |
| 203 | err_iounmap: |
| 204 | iounmap(reg_base); |
| 205 | |
| 206 | return ERR_PTR(ret); |
| 207 | } |