Carlo Caione | 6058bb3 | 2014-03-19 20:21:17 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Allwinner A20/A31 SoCs NMI IRQ chip driver. |
| 3 | * |
| 4 | * Carlo Caione <carlo.caione@gmail.com> |
| 5 | * |
| 6 | * This file is licensed under the terms of the GNU General Public |
| 7 | * License version 2. This program is licensed "as is" without any |
| 8 | * warranty of any kind, whether express or implied. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/bitops.h> |
| 12 | #include <linux/device.h> |
| 13 | #include <linux/io.h> |
| 14 | #include <linux/irq.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/irqdomain.h> |
| 17 | #include <linux/of_irq.h> |
| 18 | #include <linux/of_address.h> |
| 19 | #include <linux/of_platform.h> |
| 20 | #include <linux/irqchip/chained_irq.h> |
| 21 | #include "irqchip.h" |
| 22 | |
| 23 | #define SUNXI_NMI_SRC_TYPE_MASK 0x00000003 |
| 24 | |
| 25 | enum { |
| 26 | SUNXI_SRC_TYPE_LEVEL_LOW = 0, |
| 27 | SUNXI_SRC_TYPE_EDGE_FALLING, |
| 28 | SUNXI_SRC_TYPE_LEVEL_HIGH, |
| 29 | SUNXI_SRC_TYPE_EDGE_RISING, |
| 30 | }; |
| 31 | |
| 32 | struct sunxi_sc_nmi_reg_offs { |
| 33 | u32 ctrl; |
| 34 | u32 pend; |
| 35 | u32 enable; |
| 36 | }; |
| 37 | |
| 38 | static struct sunxi_sc_nmi_reg_offs sun7i_reg_offs = { |
| 39 | .ctrl = 0x00, |
| 40 | .pend = 0x04, |
| 41 | .enable = 0x08, |
| 42 | }; |
| 43 | |
| 44 | static struct sunxi_sc_nmi_reg_offs sun6i_reg_offs = { |
| 45 | .ctrl = 0x00, |
| 46 | .pend = 0x04, |
| 47 | .enable = 0x34, |
| 48 | }; |
| 49 | |
| 50 | static inline void sunxi_sc_nmi_write(struct irq_chip_generic *gc, u32 off, |
| 51 | u32 val) |
| 52 | { |
| 53 | irq_reg_writel(val, gc->reg_base + off); |
| 54 | } |
| 55 | |
| 56 | static inline u32 sunxi_sc_nmi_read(struct irq_chip_generic *gc, u32 off) |
| 57 | { |
| 58 | return irq_reg_readl(gc->reg_base + off); |
| 59 | } |
| 60 | |
| 61 | static void sunxi_sc_nmi_handle_irq(unsigned int irq, struct irq_desc *desc) |
| 62 | { |
| 63 | struct irq_domain *domain = irq_desc_get_handler_data(desc); |
| 64 | struct irq_chip *chip = irq_get_chip(irq); |
| 65 | unsigned int virq = irq_find_mapping(domain, 0); |
| 66 | |
| 67 | chained_irq_enter(chip, desc); |
| 68 | generic_handle_irq(virq); |
| 69 | chained_irq_exit(chip, desc); |
| 70 | } |
| 71 | |
| 72 | static int sunxi_sc_nmi_set_type(struct irq_data *data, unsigned int flow_type) |
| 73 | { |
| 74 | struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); |
| 75 | struct irq_chip_type *ct = gc->chip_types; |
| 76 | u32 src_type_reg; |
| 77 | u32 ctrl_off = ct->regs.type; |
| 78 | unsigned int src_type; |
| 79 | unsigned int i; |
| 80 | |
| 81 | irq_gc_lock(gc); |
| 82 | |
| 83 | switch (flow_type & IRQF_TRIGGER_MASK) { |
| 84 | case IRQ_TYPE_EDGE_FALLING: |
| 85 | src_type = SUNXI_SRC_TYPE_EDGE_FALLING; |
| 86 | break; |
| 87 | case IRQ_TYPE_EDGE_RISING: |
| 88 | src_type = SUNXI_SRC_TYPE_EDGE_RISING; |
| 89 | break; |
| 90 | case IRQ_TYPE_LEVEL_HIGH: |
| 91 | src_type = SUNXI_SRC_TYPE_LEVEL_HIGH; |
| 92 | break; |
| 93 | case IRQ_TYPE_NONE: |
| 94 | case IRQ_TYPE_LEVEL_LOW: |
| 95 | src_type = SUNXI_SRC_TYPE_LEVEL_LOW; |
| 96 | break; |
| 97 | default: |
| 98 | irq_gc_unlock(gc); |
| 99 | pr_err("%s: Cannot assign multiple trigger modes to IRQ %d.\n", |
| 100 | __func__, data->irq); |
| 101 | return -EBADR; |
| 102 | } |
| 103 | |
| 104 | irqd_set_trigger_type(data, flow_type); |
| 105 | irq_setup_alt_chip(data, flow_type); |
| 106 | |
| 107 | for (i = 0; i <= gc->num_ct; i++, ct++) |
| 108 | if (ct->type & flow_type) |
| 109 | ctrl_off = ct->regs.type; |
| 110 | |
| 111 | src_type_reg = sunxi_sc_nmi_read(gc, ctrl_off); |
| 112 | src_type_reg &= ~SUNXI_NMI_SRC_TYPE_MASK; |
| 113 | src_type_reg |= src_type; |
| 114 | sunxi_sc_nmi_write(gc, ctrl_off, src_type_reg); |
| 115 | |
| 116 | irq_gc_unlock(gc); |
| 117 | |
| 118 | return IRQ_SET_MASK_OK; |
| 119 | } |
| 120 | |
| 121 | static int __init sunxi_sc_nmi_irq_init(struct device_node *node, |
| 122 | struct sunxi_sc_nmi_reg_offs *reg_offs) |
| 123 | { |
| 124 | struct irq_domain *domain; |
| 125 | struct irq_chip_generic *gc; |
| 126 | unsigned int irq; |
| 127 | unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN; |
| 128 | int ret; |
| 129 | |
| 130 | |
| 131 | domain = irq_domain_add_linear(node, 1, &irq_generic_chip_ops, NULL); |
| 132 | if (!domain) { |
| 133 | pr_err("%s: Could not register interrupt domain.\n", node->name); |
| 134 | return -ENOMEM; |
| 135 | } |
| 136 | |
| 137 | ret = irq_alloc_domain_generic_chips(domain, 1, 2, node->name, |
| 138 | handle_fasteoi_irq, clr, 0, |
| 139 | IRQ_GC_INIT_MASK_CACHE); |
| 140 | if (ret) { |
| 141 | pr_err("%s: Could not allocate generic interrupt chip.\n", |
| 142 | node->name); |
| 143 | goto fail_irqd_remove; |
| 144 | } |
| 145 | |
| 146 | irq = irq_of_parse_and_map(node, 0); |
| 147 | if (irq <= 0) { |
| 148 | pr_err("%s: unable to parse irq\n", node->name); |
| 149 | ret = -EINVAL; |
| 150 | goto fail_irqd_remove; |
| 151 | } |
| 152 | |
| 153 | gc = irq_get_domain_generic_chip(domain, 0); |
| 154 | gc->reg_base = of_iomap(node, 0); |
| 155 | if (!gc->reg_base) { |
| 156 | pr_err("%s: unable to map resource\n", node->name); |
| 157 | ret = -ENOMEM; |
| 158 | goto fail_irqd_remove; |
| 159 | } |
| 160 | |
| 161 | gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK; |
| 162 | gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit; |
| 163 | gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit; |
| 164 | gc->chip_types[0].chip.irq_eoi = irq_gc_ack_set_bit; |
| 165 | gc->chip_types[0].chip.irq_set_type = sunxi_sc_nmi_set_type; |
| 166 | gc->chip_types[0].chip.flags = IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED; |
| 167 | gc->chip_types[0].regs.ack = reg_offs->pend; |
| 168 | gc->chip_types[0].regs.mask = reg_offs->enable; |
| 169 | gc->chip_types[0].regs.type = reg_offs->ctrl; |
| 170 | |
| 171 | gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH; |
| 172 | gc->chip_types[1].chip.name = gc->chip_types[0].chip.name; |
| 173 | gc->chip_types[1].chip.irq_ack = irq_gc_ack_set_bit; |
| 174 | gc->chip_types[1].chip.irq_mask = irq_gc_mask_clr_bit; |
| 175 | gc->chip_types[1].chip.irq_unmask = irq_gc_mask_set_bit; |
| 176 | gc->chip_types[1].chip.irq_set_type = sunxi_sc_nmi_set_type; |
| 177 | gc->chip_types[1].regs.ack = reg_offs->pend; |
| 178 | gc->chip_types[1].regs.mask = reg_offs->enable; |
| 179 | gc->chip_types[1].regs.type = reg_offs->ctrl; |
| 180 | gc->chip_types[1].handler = handle_edge_irq; |
| 181 | |
Carlo Caione | 6058bb3 | 2014-03-19 20:21:17 +0100 | [diff] [blame] | 182 | sunxi_sc_nmi_write(gc, reg_offs->enable, 0); |
| 183 | sunxi_sc_nmi_write(gc, reg_offs->pend, 0x1); |
| 184 | |
Hans de Goede | 1b422ec | 2014-03-27 18:02:39 +0100 | [diff] [blame] | 185 | irq_set_handler_data(irq, domain); |
| 186 | irq_set_chained_handler(irq, sunxi_sc_nmi_handle_irq); |
| 187 | |
Carlo Caione | 6058bb3 | 2014-03-19 20:21:17 +0100 | [diff] [blame] | 188 | return 0; |
| 189 | |
| 190 | fail_irqd_remove: |
| 191 | irq_domain_remove(domain); |
| 192 | |
| 193 | return ret; |
| 194 | } |
| 195 | |
| 196 | static int __init sun6i_sc_nmi_irq_init(struct device_node *node, |
| 197 | struct device_node *parent) |
| 198 | { |
| 199 | return sunxi_sc_nmi_irq_init(node, &sun6i_reg_offs); |
| 200 | } |
| 201 | IRQCHIP_DECLARE(sun6i_sc_nmi, "allwinner,sun6i-a31-sc-nmi", sun6i_sc_nmi_irq_init); |
| 202 | |
| 203 | static int __init sun7i_sc_nmi_irq_init(struct device_node *node, |
| 204 | struct device_node *parent) |
| 205 | { |
| 206 | return sunxi_sc_nmi_irq_init(node, &sun7i_reg_offs); |
| 207 | } |
| 208 | IRQCHIP_DECLARE(sun7i_sc_nmi, "allwinner,sun7i-a20-sc-nmi", sun7i_sc_nmi_irq_init); |