1 /* 2 * Copyright (C) 2016 Marvell 3 * 4 * Thomas Petazzoni <thomas.petazzoni@free-electrons.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 #define pr_fmt(fmt) "GIC-ODMI: " fmt 12 13 #include <linux/irq.h> 14 #include <linux/irqchip.h> 15 #include <linux/irqdomain.h> 16 #include <linux/kernel.h> 17 #include <linux/msi.h> 18 #include <linux/of_address.h> 19 #include <linux/slab.h> 20 #include <dt-bindings/interrupt-controller/arm-gic.h> 21 22 #define GICP_ODMIN_SET 0x40 23 #define GICP_ODMI_INT_NUM_SHIFT 12 24 #define GICP_ODMIN_GM_EP_R0 0x110 25 #define GICP_ODMIN_GM_EP_R1 0x114 26 #define GICP_ODMIN_GM_EA_R0 0x108 27 #define GICP_ODMIN_GM_EA_R1 0x118 28 29 /* 30 * We don't support the group events, so we simply have 8 interrupts 31 * per frame. 32 */ 33 #define NODMIS_SHIFT 3 34 #define NODMIS_PER_FRAME (1 << NODMIS_SHIFT) 35 #define NODMIS_MASK (NODMIS_PER_FRAME - 1) 36 37 struct odmi_data { 38 struct resource res; 39 void __iomem *base; 40 unsigned int spi_base; 41 }; 42 43 static struct odmi_data *odmis; 44 static unsigned long *odmis_bm; 45 static unsigned int odmis_count; 46 47 /* Protects odmis_bm */ 48 static DEFINE_SPINLOCK(odmis_bm_lock); 49 50 static void odmi_compose_msi_msg(struct irq_data *d, struct msi_msg *msg) 51 { 52 struct odmi_data *odmi; 53 phys_addr_t addr; 54 unsigned int odmin; 55 56 if (WARN_ON(d->hwirq >= odmis_count * NODMIS_PER_FRAME)) 57 return; 58 59 odmi = &odmis[d->hwirq >> NODMIS_SHIFT]; 60 odmin = d->hwirq & NODMIS_MASK; 61 62 addr = odmi->res.start + GICP_ODMIN_SET; 63 64 msg->address_hi = upper_32_bits(addr); 65 msg->address_lo = lower_32_bits(addr); 66 msg->data = odmin << GICP_ODMI_INT_NUM_SHIFT; 67 } 68 69 static struct irq_chip odmi_irq_chip = { 70 .name = "ODMI", 71 .irq_mask = irq_chip_mask_parent, 72 .irq_unmask = irq_chip_unmask_parent, 73 .irq_eoi = irq_chip_eoi_parent, 74 .irq_set_affinity = irq_chip_set_affinity_parent, 75 .irq_compose_msi_msg = odmi_compose_msi_msg, 76 }; 77 78 static int odmi_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, 79 unsigned int nr_irqs, void *args) 80 { 81 struct odmi_data *odmi = NULL; 82 struct irq_fwspec fwspec; 83 struct irq_data *d; 84 unsigned int hwirq, odmin; 85 int ret; 86 87 spin_lock(&odmis_bm_lock); 88 hwirq = find_first_zero_bit(odmis_bm, NODMIS_PER_FRAME * odmis_count); 89 if (hwirq >= NODMIS_PER_FRAME * odmis_count) { 90 spin_unlock(&odmis_bm_lock); 91 return -ENOSPC; 92 } 93 94 __set_bit(hwirq, odmis_bm); 95 spin_unlock(&odmis_bm_lock); 96 97 odmi = &odmis[hwirq >> NODMIS_SHIFT]; 98 odmin = hwirq & NODMIS_MASK; 99 100 fwspec.fwnode = domain->parent->fwnode; 101 fwspec.param_count = 3; 102 fwspec.param[0] = GIC_SPI; 103 fwspec.param[1] = odmi->spi_base - 32 + odmin; 104 fwspec.param[2] = IRQ_TYPE_EDGE_RISING; 105 106 ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec); 107 if (ret) { 108 pr_err("Cannot allocate parent IRQ\n"); 109 spin_lock(&odmis_bm_lock); 110 __clear_bit(odmin, odmis_bm); 111 spin_unlock(&odmis_bm_lock); 112 return ret; 113 } 114 115 /* Configure the interrupt line to be edge */ 116 d = irq_domain_get_irq_data(domain->parent, virq); 117 d->chip->irq_set_type(d, IRQ_TYPE_EDGE_RISING); 118 119 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, 120 &odmi_irq_chip, NULL); 121 122 return 0; 123 } 124 125 static void odmi_irq_domain_free(struct irq_domain *domain, 126 unsigned int virq, unsigned int nr_irqs) 127 { 128 struct irq_data *d = irq_domain_get_irq_data(domain, virq); 129 130 if (d->hwirq >= odmis_count * NODMIS_PER_FRAME) { 131 pr_err("Failed to teardown msi. Invalid hwirq %lu\n", d->hwirq); 132 return; 133 } 134 135 irq_domain_free_irqs_parent(domain, virq, nr_irqs); 136 137 /* Actually free the MSI */ 138 spin_lock(&odmis_bm_lock); 139 __clear_bit(d->hwirq, odmis_bm); 140 spin_unlock(&odmis_bm_lock); 141 } 142 143 static const struct irq_domain_ops odmi_domain_ops = { 144 .alloc = odmi_irq_domain_alloc, 145 .free = odmi_irq_domain_free, 146 }; 147 148 static struct irq_chip odmi_msi_irq_chip = { 149 .name = "ODMI", 150 }; 151 152 static struct msi_domain_ops odmi_msi_ops = { 153 }; 154 155 static struct msi_domain_info odmi_msi_domain_info = { 156 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), 157 .ops = &odmi_msi_ops, 158 .chip = &odmi_msi_irq_chip, 159 }; 160 161 static int __init mvebu_odmi_init(struct device_node *node, 162 struct device_node *parent) 163 { 164 struct irq_domain *parent_domain, *inner_domain, *plat_domain; 165 int ret, i; 166 167 if (of_property_read_u32(node, "marvell,odmi-frames", &odmis_count)) 168 return -EINVAL; 169 170 odmis = kcalloc(odmis_count, sizeof(struct odmi_data), GFP_KERNEL); 171 if (!odmis) 172 return -ENOMEM; 173 174 odmis_bm = bitmap_zalloc(odmis_count * NODMIS_PER_FRAME, GFP_KERNEL); 175 if (!odmis_bm) { 176 ret = -ENOMEM; 177 goto err_alloc; 178 } 179 180 for (i = 0; i < odmis_count; i++) { 181 struct odmi_data *odmi = &odmis[i]; 182 183 ret = of_address_to_resource(node, i, &odmi->res); 184 if (ret) 185 goto err_unmap; 186 187 odmi->base = of_io_request_and_map(node, i, "odmi"); 188 if (IS_ERR(odmi->base)) { 189 ret = PTR_ERR(odmi->base); 190 goto err_unmap; 191 } 192 193 if (of_property_read_u32_index(node, "marvell,spi-base", 194 i, &odmi->spi_base)) { 195 ret = -EINVAL; 196 goto err_unmap; 197 } 198 } 199 200 parent_domain = irq_find_host(parent); 201 202 inner_domain = irq_domain_create_hierarchy(parent_domain, 0, 203 odmis_count * NODMIS_PER_FRAME, 204 of_node_to_fwnode(node), 205 &odmi_domain_ops, NULL); 206 if (!inner_domain) { 207 ret = -ENOMEM; 208 goto err_unmap; 209 } 210 211 plat_domain = platform_msi_create_irq_domain(of_node_to_fwnode(node), 212 &odmi_msi_domain_info, 213 inner_domain); 214 if (!plat_domain) { 215 ret = -ENOMEM; 216 goto err_remove_inner; 217 } 218 219 return 0; 220 221 err_remove_inner: 222 irq_domain_remove(inner_domain); 223 err_unmap: 224 for (i = 0; i < odmis_count; i++) { 225 struct odmi_data *odmi = &odmis[i]; 226 227 if (odmi->base && !IS_ERR(odmi->base)) 228 iounmap(odmis[i].base); 229 } 230 bitmap_free(odmis_bm); 231 err_alloc: 232 kfree(odmis); 233 return ret; 234 } 235 236 IRQCHIP_DECLARE(mvebu_odmi, "marvell,odmi-controller", mvebu_odmi_init); 237