drivers/irqchip/irq-mvebu-icu.c

   1 /*
   2  * Copyright (C) 2017 Marvell
   3  *
   4  * Hanna Hawa <hannah@marvell.com>
   5  * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   6  *
   7  * This file is licensed under the terms of the GNU General Public
   8  * License version 2. This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  */
  11
  12 #include <linux/interrupt.h>
  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_irq.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_device.h>
  21
  22 #include <dt-bindings/interrupt-controller/mvebu-icu.h>
  23
  24 /* ICU registers */
  25 #define ICU_SETSPI_NSR_AL       0x10
  26 #define ICU_SETSPI_NSR_AH       0x14
  27 #define ICU_CLRSPI_NSR_AL       0x18
  28 #define ICU_CLRSPI_NSR_AH       0x1c
  29 #define ICU_INT_CFG(x)          (0x100 + 4 * (x))
  30 #define   ICU_INT_ENABLE        BIT(24)
  31 #define   ICU_IS_EDGE           BIT(28)
  32 #define   ICU_GROUP_SHIFT       29
  33
  34 /* ICU definitions */
  35 #define ICU_MAX_IRQS            207
  36 #define ICU_SATA0_ICU_ID        109
  37 #define ICU_SATA1_ICU_ID        107
  38
  39 struct mvebu_icu {
  40         struct irq_chip irq_chip;
  41         void __iomem *base;
  42         struct irq_domain *domain;
  43         struct device *dev;
  44         atomic_t initialized;
  45 };
  46
  47 struct mvebu_icu_irq_data {
  48         struct mvebu_icu *icu;
  49         unsigned int icu_group;
  50         unsigned int type;
  51 };
  52
  53 static void mvebu_icu_init(struct mvebu_icu *icu, struct msi_msg *msg)
  54 {
  55         if (atomic_cmpxchg(&icu->initialized, false, true))
  56                 return;
  57
  58         /* Set Clear/Set ICU SPI message address in AP */
  59         writel_relaxed(msg[0].address_hi, icu->base + ICU_SETSPI_NSR_AH);
  60         writel_relaxed(msg[0].address_lo, icu->base + ICU_SETSPI_NSR_AL);
  61         writel_relaxed(msg[1].address_hi, icu->base + ICU_CLRSPI_NSR_AH);
  62         writel_relaxed(msg[1].address_lo, icu->base + ICU_CLRSPI_NSR_AL);
  63 }
  64
  65 static void mvebu_icu_write_msg(struct msi_desc *desc, struct msi_msg *msg)
  66 {
  67         struct irq_data *d = irq_get_irq_data(desc->irq);
  68         struct mvebu_icu_irq_data *icu_irqd = d->chip_data;
  69         struct mvebu_icu *icu = icu_irqd->icu;
  70         unsigned int icu_int;
  71
  72         if (msg->address_lo || msg->address_hi) {
  73                 /* One off initialization */
  74                 mvebu_icu_init(icu, msg);
  75                 /* Configure the ICU with irq number & type */
  76                 icu_int = msg->data | ICU_INT_ENABLE;
  77                 if (icu_irqd->type & IRQ_TYPE_EDGE_RISING)
  78                         icu_int |= ICU_IS_EDGE;
  79                 icu_int |= icu_irqd->icu_group << ICU_GROUP_SHIFT;
  80         } else {
  81                 /* De-configure the ICU */
  82                 icu_int = 0;
  83         }
  84
  85         writel_relaxed(icu_int, icu->base + ICU_INT_CFG(d->hwirq));
  86
  87         /*
  88          * The SATA unit has 2 ports, and a dedicated ICU entry per
  89          * port. The ahci sata driver supports only one irq interrupt
  90          * per SATA unit. To solve this conflict, we configure the 2
  91          * SATA wired interrupts in the south bridge into 1 GIC
  92          * interrupt in the north bridge. Even if only a single port
  93          * is enabled, if sata node is enabled, both interrupts are
  94          * configured (regardless of which port is actually in use).
  95          */
  96         if (d->hwirq == ICU_SATA0_ICU_ID || d->hwirq == ICU_SATA1_ICU_ID) {
  97                 writel_relaxed(icu_int,
  98                                icu->base + ICU_INT_CFG(ICU_SATA0_ICU_ID));
  99                 writel_relaxed(icu_int,
 100                                icu->base + ICU_INT_CFG(ICU_SATA1_ICU_ID));
 101         }
 102 }
 103
 104 static int
 105 mvebu_icu_irq_domain_translate(struct irq_domain *d, struct irq_fwspec *fwspec,
 106                                unsigned long *hwirq, unsigned int *type)
 107 {
 108         struct mvebu_icu *icu = platform_msi_get_host_data(d);
 109         unsigned int icu_group;
 110
 111         /* Check the count of the parameters in dt */
 112         if (WARN_ON(fwspec->param_count < 3)) {
 113                 dev_err(icu->dev, "wrong ICU parameter count %d\n",
 114                         fwspec->param_count);
 115                 return -EINVAL;
 116         }
 117
 118         /* Only ICU group type is handled */
 119         icu_group = fwspec->param[0];
 120         if (icu_group != ICU_GRP_NSR && icu_group != ICU_GRP_SR &&
 121             icu_group != ICU_GRP_SEI && icu_group != ICU_GRP_REI) {
 122                 dev_err(icu->dev, "wrong ICU group type %x\n", icu_group);
 123                 return -EINVAL;
 124         }
 125
 126         *hwirq = fwspec->param[1];
 127         if (*hwirq >= ICU_MAX_IRQS) {
 128                 dev_err(icu->dev, "invalid interrupt number %ld\n", *hwirq);
 129                 return -EINVAL;
 130         }
 131
 132         /* Mask the type to prevent wrong DT configuration */
 133         *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
 134
 135         return 0;
 136 }
 137
 138 static int
 139 mvebu_icu_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 140                            unsigned int nr_irqs, void *args)
 141 {
 142         int err;
 143         unsigned long hwirq;
 144         struct irq_fwspec *fwspec = args;
 145         struct mvebu_icu *icu = platform_msi_get_host_data(domain);
 146         struct mvebu_icu_irq_data *icu_irqd;
 147
 148         icu_irqd = kmalloc(sizeof(*icu_irqd), GFP_KERNEL);
 149         if (!icu_irqd)
 150                 return -ENOMEM;
 151
 152         err = mvebu_icu_irq_domain_translate(domain, fwspec, &hwirq,
 153                                              &icu_irqd->type);
 154         if (err) {
 155                 dev_err(icu->dev, "failed to translate ICU parameters\n");
 156                 goto free_irqd;
 157         }
 158
 159         icu_irqd->icu_group = fwspec->param[0];
 160         icu_irqd->icu = icu;
 161
 162         err = platform_msi_domain_alloc(domain, virq, nr_irqs);
 163         if (err) {
 164                 dev_err(icu->dev, "failed to allocate ICU interrupt in parent domain\n");
 165                 goto free_irqd;
 166         }
 167
 168         /* Make sure there is no interrupt left pending by the firmware */
 169         err = irq_set_irqchip_state(virq, IRQCHIP_STATE_PENDING, false);
 170         if (err)
 171                 goto free_msi;
 172
 173         err = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
 174                                             &icu->irq_chip, icu_irqd);
 175         if (err) {
 176                 dev_err(icu->dev, "failed to set the data to IRQ domain\n");
 177                 goto free_msi;
 178         }
 179
 180         return 0;
 181
 182 free_msi:
 183         platform_msi_domain_free(domain, virq, nr_irqs);
 184 free_irqd:
 185         kfree(icu_irqd);
 186         return err;
 187 }
 188
 189 static void
 190 mvebu_icu_irq_domain_free(struct irq_domain *domain, unsigned int virq,
 191                           unsigned int nr_irqs)
 192 {
 193         struct irq_data *d = irq_get_irq_data(virq);
 194         struct mvebu_icu_irq_data *icu_irqd = d->chip_data;
 195
 196         kfree(icu_irqd);
 197
 198         platform_msi_domain_free(domain, virq, nr_irqs);
 199 }
 200
 201 static const struct irq_domain_ops mvebu_icu_domain_ops = {
 202         .translate = mvebu_icu_irq_domain_translate,
 203         .alloc     = mvebu_icu_irq_domain_alloc,
 204         .free      = mvebu_icu_irq_domain_free,
 205 };
 206
 207 static int mvebu_icu_probe(struct platform_device *pdev)
 208 {
 209         struct mvebu_icu *icu;
 210         struct device_node *node = pdev->dev.of_node;
 211         struct device_node *gicp_dn;
 212         struct resource *res;
 213         int i;
 214
 215         icu = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_icu),
 216                            GFP_KERNEL);
 217         if (!icu)
 218                 return -ENOMEM;
 219
 220         icu->dev = &pdev->dev;
 221
 222         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 223         icu->base = devm_ioremap_resource(&pdev->dev, res);
 224         if (IS_ERR(icu->base)) {
 225                 dev_err(&pdev->dev, "Failed to map icu base address.\n");
 226                 return PTR_ERR(icu->base);
 227         }
 228
 229         icu->irq_chip.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
 230                                             "ICU.%x",
 231                                             (unsigned int)res->start);
 232         if (!icu->irq_chip.name)
 233                 return -ENOMEM;
 234
 235         icu->irq_chip.irq_mask = irq_chip_mask_parent;
 236         icu->irq_chip.irq_unmask = irq_chip_unmask_parent;
 237         icu->irq_chip.irq_eoi = irq_chip_eoi_parent;
 238         icu->irq_chip.irq_set_type = irq_chip_set_type_parent;
 239 #ifdef CONFIG_SMP
 240         icu->irq_chip.irq_set_affinity = irq_chip_set_affinity_parent;
 241 #endif
 242
 243         /*
 244          * We're probed after MSI domains have been resolved, so force
 245          * resolution here.
 246          */
 247         pdev->dev.msi_domain = of_msi_get_domain(&pdev->dev, node,
 248                                                  DOMAIN_BUS_PLATFORM_MSI);
 249         if (!pdev->dev.msi_domain)
 250                 return -EPROBE_DEFER;
 251
 252         gicp_dn = irq_domain_get_of_node(pdev->dev.msi_domain);
 253         if (!gicp_dn)
 254                 return -ENODEV;
 255
 256         /*
 257          * Clean all ICU interrupts with type SPI_NSR, required to
 258          * avoid unpredictable SPI assignments done by firmware.
 259          */
 260         for (i = 0 ; i < ICU_MAX_IRQS ; i++) {
 261                 u32 icu_int = readl_relaxed(icu->base + ICU_INT_CFG(i));
 262                 if ((icu_int >> ICU_GROUP_SHIFT) == ICU_GRP_NSR)
 263                         writel_relaxed(0x0, icu->base + ICU_INT_CFG(i));
 264         }
 265
 266         icu->domain =
 267                 platform_msi_create_device_domain(&pdev->dev, ICU_MAX_IRQS,
 268                                                   mvebu_icu_write_msg,
 269                                                   &mvebu_icu_domain_ops, icu);
 270         if (!icu->domain) {
 271                 dev_err(&pdev->dev, "Failed to create ICU domain\n");
 272                 return -ENOMEM;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static const struct of_device_id mvebu_icu_of_match[] = {
 279         { .compatible = "marvell,cp110-icu", },
 280         {},
 281 };
 282
 283 static struct platform_driver mvebu_icu_driver = {
 284         .probe  = mvebu_icu_probe,
 285         .driver = {
 286                 .name = "mvebu-icu",
 287                 .of_match_table = mvebu_icu_of_match,
 288         },
 289 };
 290 builtin_platform_driver(mvebu_icu_driver);