drivers/irqchip/irq-mbigen.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015 HiSilicon Limited, All Rights Reserved.
   4  * Author: Jun Ma <majun258@huawei.com>
   5  * Author: Yun Wu <wuyun.wu@huawei.com>
   6  */
   7
   8 #include <linux/acpi.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/irqchip.h>
  11 #include <linux/module.h>
  12 #include <linux/msi.h>
  13 #include <linux/of_address.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18
  19 /* Interrupt numbers per mbigen node supported */
  20 #define IRQS_PER_MBIGEN_NODE            128
  21
  22 /* 64 irqs (Pin0-pin63) are reserved for each mbigen chip */
  23 #define RESERVED_IRQ_PER_MBIGEN_CHIP    64
  24
  25 /* The maximum IRQ pin number of mbigen chip(start from 0) */
  26 #define MAXIMUM_IRQ_PIN_NUM             1407
  27
  28 /*
  29  * In mbigen vector register
  30  * bit[21:12]:  event id value
  31  * bit[11:0]:   device id
  32  */
  33 #define IRQ_EVENT_ID_SHIFT              12
  34 #define IRQ_EVENT_ID_MASK               0x3ff
  35
  36 /* register range of each mbigen node */
  37 #define MBIGEN_NODE_OFFSET              0x1000
  38
  39 /* offset of vector register in mbigen node */
  40 #define REG_MBIGEN_VEC_OFFSET           0x200
  41
  42 /*
  43  * offset of clear register in mbigen node
  44  * This register is used to clear the status
  45  * of interrupt
  46  */
  47 #define REG_MBIGEN_CLEAR_OFFSET         0xa000
  48
  49 /*
  50  * offset of interrupt type register
  51  * This register is used to configure interrupt
  52  * trigger type
  53  */
  54 #define REG_MBIGEN_TYPE_OFFSET          0x0
  55
  56 /**
  57  * struct mbigen_device - holds the information of mbigen device.
  58  *
  59  * @pdev:               pointer to the platform device structure of mbigen chip.
  60  * @base:               mapped address of this mbigen chip.
  61  */
  62 struct mbigen_device {
  63         struct platform_device  *pdev;
  64         void __iomem            *base;
  65 };
  66
  67 static inline unsigned int get_mbigen_vec_reg(irq_hw_number_t hwirq)
  68 {
  69         unsigned int nid, pin;
  70
  71         hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
  72         nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
  73         pin = hwirq % IRQS_PER_MBIGEN_NODE;
  74
  75         return pin * 4 + nid * MBIGEN_NODE_OFFSET
  76                         + REG_MBIGEN_VEC_OFFSET;
  77 }
  78
  79 static inline void get_mbigen_type_reg(irq_hw_number_t hwirq,
  80                                         u32 *mask, u32 *addr)
  81 {
  82         unsigned int nid, irq_ofst, ofst;
  83
  84         hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
  85         nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
  86         irq_ofst = hwirq % IRQS_PER_MBIGEN_NODE;
  87
  88         *mask = 1 << (irq_ofst % 32);
  89         ofst = irq_ofst / 32 * 4;
  90
  91         *addr = ofst + nid * MBIGEN_NODE_OFFSET
  92                 + REG_MBIGEN_TYPE_OFFSET;
  93 }
  94
  95 static inline void get_mbigen_clear_reg(irq_hw_number_t hwirq,
  96                                         u32 *mask, u32 *addr)
  97 {
  98         unsigned int ofst = (hwirq / 32) * 4;
  99
 100         *mask = 1 << (hwirq % 32);
 101         *addr = ofst + REG_MBIGEN_CLEAR_OFFSET;
 102 }
 103
 104 static void mbigen_eoi_irq(struct irq_data *data)
 105 {
 106         void __iomem *base = data->chip_data;
 107         u32 mask, addr;
 108
 109         get_mbigen_clear_reg(data->hwirq, &mask, &addr);
 110
 111         writel_relaxed(mask, base + addr);
 112
 113         irq_chip_eoi_parent(data);
 114 }
 115
 116 static int mbigen_set_type(struct irq_data *data, unsigned int type)
 117 {
 118         void __iomem *base = data->chip_data;
 119         u32 mask, addr, val;
 120
 121         if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
 122                 return -EINVAL;
 123
 124         get_mbigen_type_reg(data->hwirq, &mask, &addr);
 125
 126         val = readl_relaxed(base + addr);
 127
 128         if (type == IRQ_TYPE_LEVEL_HIGH)
 129                 val |= mask;
 130         else
 131                 val &= ~mask;
 132
 133         writel_relaxed(val, base + addr);
 134
 135         return 0;
 136 }
 137
 138 static struct irq_chip mbigen_irq_chip = {
 139         .name =                 "mbigen-v2",
 140         .irq_mask =             irq_chip_mask_parent,
 141         .irq_unmask =           irq_chip_unmask_parent,
 142         .irq_eoi =              mbigen_eoi_irq,
 143         .irq_set_type =         mbigen_set_type,
 144         .irq_set_affinity =     irq_chip_set_affinity_parent,
 145 };
 146
 147 static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg)
 148 {
 149         struct irq_data *d = irq_get_irq_data(desc->irq);
 150         void __iomem *base = d->chip_data;
 151         u32 val;
 152
 153         if (!msg->address_lo && !msg->address_hi)
 154                 return;
 155
 156         base += get_mbigen_vec_reg(d->hwirq);
 157         val = readl_relaxed(base);
 158
 159         val &= ~(IRQ_EVENT_ID_MASK << IRQ_EVENT_ID_SHIFT);
 160         val |= (msg->data << IRQ_EVENT_ID_SHIFT);
 161
 162         /* The address of doorbell is encoded in mbigen register by default
 163          * So,we don't need to program the doorbell address at here
 164          */
 165         writel_relaxed(val, base);
 166 }
 167
 168 static int mbigen_domain_translate(struct irq_domain *d,
 169                                     struct irq_fwspec *fwspec,
 170                                     unsigned long *hwirq,
 171                                     unsigned int *type)
 172 {
 173         if (is_of_node(fwspec->fwnode) || is_acpi_device_node(fwspec->fwnode)) {
 174                 if (fwspec->param_count != 2)
 175                         return -EINVAL;
 176
 177                 if ((fwspec->param[0] > MAXIMUM_IRQ_PIN_NUM) ||
 178                         (fwspec->param[0] < RESERVED_IRQ_PER_MBIGEN_CHIP))
 179                         return -EINVAL;
 180                 else
 181                         *hwirq = fwspec->param[0];
 182
 183                 /* If there is no valid irq type, just use the default type */
 184                 if ((fwspec->param[1] == IRQ_TYPE_EDGE_RISING) ||
 185                         (fwspec->param[1] == IRQ_TYPE_LEVEL_HIGH))
 186                         *type = fwspec->param[1];
 187                 else
 188                         return -EINVAL;
 189
 190                 return 0;
 191         }
 192         return -EINVAL;
 193 }
 194
 195 static int mbigen_irq_domain_alloc(struct irq_domain *domain,
 196                                         unsigned int virq,
 197                                         unsigned int nr_irqs,
 198                                         void *args)
 199 {
 200         struct irq_fwspec *fwspec = args;
 201         irq_hw_number_t hwirq;
 202         unsigned int type;
 203         struct mbigen_device *mgn_chip;
 204         int i, err;
 205
 206         err = mbigen_domain_translate(domain, fwspec, &hwirq, &type);
 207         if (err)
 208                 return err;
 209
 210         err = platform_msi_domain_alloc(domain, virq, nr_irqs);
 211         if (err)
 212                 return err;
 213
 214         mgn_chip = platform_msi_get_host_data(domain);
 215
 216         for (i = 0; i < nr_irqs; i++)
 217                 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
 218                                       &mbigen_irq_chip, mgn_chip->base);
 219
 220         return 0;
 221 }
 222
 223 static void mbigen_irq_domain_free(struct irq_domain *domain, unsigned int virq,
 224                                    unsigned int nr_irqs)
 225 {
 226         platform_msi_domain_free(domain, virq, nr_irqs);
 227 }
 228
 229 static const struct irq_domain_ops mbigen_domain_ops = {
 230         .translate      = mbigen_domain_translate,
 231         .alloc          = mbigen_irq_domain_alloc,
 232         .free           = mbigen_irq_domain_free,
 233 };
 234
 235 static int mbigen_of_create_domain(struct platform_device *pdev,
 236                                    struct mbigen_device *mgn_chip)
 237 {
 238         struct device *parent;
 239         struct platform_device *child;
 240         struct irq_domain *domain;
 241         struct device_node *np;
 242         u32 num_pins;
 243
 244         for_each_child_of_node(pdev->dev.of_node, np) {
 245                 if (!of_property_read_bool(np, "interrupt-controller"))
 246                         continue;
 247
 248                 parent = platform_bus_type.dev_root;
 249                 child = of_platform_device_create(np, NULL, parent);
 250                 if (!child) {
 251                         of_node_put(np);
 252                         return -ENOMEM;
 253                 }
 254
 255                 if (of_property_read_u32(child->dev.of_node, "num-pins",
 256                                          &num_pins) < 0) {
 257                         dev_err(&pdev->dev, "No num-pins property\n");
 258                         of_node_put(np);
 259                         return -EINVAL;
 260                 }
 261
 262                 domain = platform_msi_create_device_domain(&child->dev, num_pins,
 263                                                            mbigen_write_msg,
 264                                                            &mbigen_domain_ops,
 265                                                            mgn_chip);
 266                 if (!domain) {
 267                         of_node_put(np);
 268                         return -ENOMEM;
 269                 }
 270         }
 271
 272         return 0;
 273 }
 274
 275 #ifdef CONFIG_ACPI
 276 static const struct acpi_device_id mbigen_acpi_match[] = {
 277         { "HISI0152", 0 },
 278         {}
 279 };
 280 MODULE_DEVICE_TABLE(acpi, mbigen_acpi_match);
 281
 282 static int mbigen_acpi_create_domain(struct platform_device *pdev,
 283                                      struct mbigen_device *mgn_chip)
 284 {
 285         struct irq_domain *domain;
 286         u32 num_pins = 0;
 287         int ret;
 288
 289         /*
 290          * "num-pins" is the total number of interrupt pins implemented in
 291          * this mbigen instance, and mbigen is an interrupt controller
 292          * connected to ITS  converting wired interrupts into MSI, so we
 293          * use "num-pins" to alloc MSI vectors which are needed by client
 294          * devices connected to it.
 295          *
 296          * Here is the DSDT device node used for mbigen in firmware:
 297          *      Device(MBI0) {
 298          *              Name(_HID, "HISI0152")
 299          *              Name(_UID, Zero)
 300          *              Name(_CRS, ResourceTemplate() {
 301          *                      Memory32Fixed(ReadWrite, 0xa0080000, 0x10000)
 302          *              })
 303          *
 304          *              Name(_DSD, Package () {
 305          *                      ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
 306          *                      Package () {
 307          *                              Package () {"num-pins", 378}
 308          *                      }
 309          *              })
 310          *      }
 311          */
 312         ret = device_property_read_u32(&pdev->dev, "num-pins", &num_pins);
 313         if (ret || num_pins == 0)
 314                 return -EINVAL;
 315
 316         domain = platform_msi_create_device_domain(&pdev->dev, num_pins,
 317                                                    mbigen_write_msg,
 318                                                    &mbigen_domain_ops,
 319                                                    mgn_chip);
 320         if (!domain)
 321                 return -ENOMEM;
 322
 323         return 0;
 324 }
 325 #else
 326 static inline int mbigen_acpi_create_domain(struct platform_device *pdev,
 327                                             struct mbigen_device *mgn_chip)
 328 {
 329         return -ENODEV;
 330 }
 331 #endif
 332
 333 static int mbigen_device_probe(struct platform_device *pdev)
 334 {
 335         struct mbigen_device *mgn_chip;
 336         struct resource *res;
 337         int err;
 338
 339         mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL);
 340         if (!mgn_chip)
 341                 return -ENOMEM;
 342
 343         mgn_chip->pdev = pdev;
 344
 345         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 346         if (!res)
 347                 return -EINVAL;
 348
 349         mgn_chip->base = devm_ioremap(&pdev->dev, res->start,
 350                                       resource_size(res));
 351         if (!mgn_chip->base) {
 352                 dev_err(&pdev->dev, "failed to ioremap %pR\n", res);
 353                 return -ENOMEM;
 354         }
 355
 356         if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node)
 357                 err = mbigen_of_create_domain(pdev, mgn_chip);
 358         else if (ACPI_COMPANION(&pdev->dev))
 359                 err = mbigen_acpi_create_domain(pdev, mgn_chip);
 360         else
 361                 err = -EINVAL;
 362
 363         if (err) {
 364                 dev_err(&pdev->dev, "Failed to create mbi-gen irqdomain\n");
 365                 return err;
 366         }
 367
 368         platform_set_drvdata(pdev, mgn_chip);
 369         return 0;
 370 }
 371
 372 static const struct of_device_id mbigen_of_match[] = {
 373         { .compatible = "hisilicon,mbigen-v2" },
 374         { /* END */ }
 375 };
 376 MODULE_DEVICE_TABLE(of, mbigen_of_match);
 377
 378 static struct platform_driver mbigen_platform_driver = {
 379         .driver = {
 380                 .name           = "Hisilicon MBIGEN-V2",
 381                 .of_match_table = mbigen_of_match,
 382                 .acpi_match_table = ACPI_PTR(mbigen_acpi_match),
 383                 .suppress_bind_attrs = true,
 384         },
 385         .probe                  = mbigen_device_probe,
 386 };
 387
 388 module_platform_driver(mbigen_platform_driver);
 389
 390 MODULE_AUTHOR("Jun Ma <majun258@huawei.com>");
 391 MODULE_AUTHOR("Yun Wu <wuyun.wu@huawei.com>");
 392 MODULE_LICENSE("GPL");
 393 MODULE_DESCRIPTION("HiSilicon MBI Generator driver");