drivers/irqchip/irq-imx-gpcv2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015 Freescale Semiconductor, Inc.
   4  */
   5
   6 #include <linux/of_address.h>
   7 #include <linux/of_irq.h>
   8 #include <linux/slab.h>
   9 #include <linux/irqchip.h>
  10 #include <linux/syscore_ops.h>
  11
  12 #define IMR_NUM                 4
  13 #define GPC_MAX_IRQS            (IMR_NUM * 32)
  14
  15 #define GPC_IMR1_CORE0          0x30
  16 #define GPC_IMR1_CORE1          0x40
  17 #define GPC_IMR1_CORE2          0x1c0
  18 #define GPC_IMR1_CORE3          0x1d0
  19
  20
  21 struct gpcv2_irqchip_data {
  22         struct raw_spinlock     rlock;
  23         void __iomem            *gpc_base;
  24         u32                     wakeup_sources[IMR_NUM];
  25         u32                     saved_irq_mask[IMR_NUM];
  26         u32                     cpu2wakeup;
  27 };
  28
  29 static struct gpcv2_irqchip_data *imx_gpcv2_instance __ro_after_init;
  30
  31 static void __iomem *gpcv2_idx_to_reg(struct gpcv2_irqchip_data *cd, int i)
  32 {
  33         return cd->gpc_base + cd->cpu2wakeup + i * 4;
  34 }
  35
  36 static int gpcv2_wakeup_source_save(void)
  37 {
  38         struct gpcv2_irqchip_data *cd;
  39         void __iomem *reg;
  40         int i;
  41
  42         cd = imx_gpcv2_instance;
  43         if (!cd)
  44                 return 0;
  45
  46         for (i = 0; i < IMR_NUM; i++) {
  47                 reg = gpcv2_idx_to_reg(cd, i);
  48                 cd->saved_irq_mask[i] = readl_relaxed(reg);
  49                 writel_relaxed(cd->wakeup_sources[i], reg);
  50         }
  51
  52         return 0;
  53 }
  54
  55 static void gpcv2_wakeup_source_restore(void)
  56 {
  57         struct gpcv2_irqchip_data *cd;
  58         int i;
  59
  60         cd = imx_gpcv2_instance;
  61         if (!cd)
  62                 return;
  63
  64         for (i = 0; i < IMR_NUM; i++)
  65                 writel_relaxed(cd->saved_irq_mask[i], gpcv2_idx_to_reg(cd, i));
  66 }
  67
  68 static struct syscore_ops imx_gpcv2_syscore_ops = {
  69         .suspend        = gpcv2_wakeup_source_save,
  70         .resume         = gpcv2_wakeup_source_restore,
  71 };
  72
  73 static int imx_gpcv2_irq_set_wake(struct irq_data *d, unsigned int on)
  74 {
  75         struct gpcv2_irqchip_data *cd = d->chip_data;
  76         unsigned int idx = d->hwirq / 32;
  77         unsigned long flags;
  78         u32 mask, val;
  79
  80         raw_spin_lock_irqsave(&cd->rlock, flags);
  81         mask = BIT(d->hwirq % 32);
  82         val = cd->wakeup_sources[idx];
  83
  84         cd->wakeup_sources[idx] = on ? (val & ~mask) : (val | mask);
  85         raw_spin_unlock_irqrestore(&cd->rlock, flags);
  86
  87         /*
  88          * Do *not* call into the parent, as the GIC doesn't have any
  89          * wake-up facility...
  90          */
  91
  92         return 0;
  93 }
  94
  95 static void imx_gpcv2_irq_unmask(struct irq_data *d)
  96 {
  97         struct gpcv2_irqchip_data *cd = d->chip_data;
  98         void __iomem *reg;
  99         u32 val;
 100
 101         raw_spin_lock(&cd->rlock);
 102         reg = gpcv2_idx_to_reg(cd, d->hwirq / 32);
 103         val = readl_relaxed(reg);
 104         val &= ~BIT(d->hwirq % 32);
 105         writel_relaxed(val, reg);
 106         raw_spin_unlock(&cd->rlock);
 107
 108         irq_chip_unmask_parent(d);
 109 }
 110
 111 static void imx_gpcv2_irq_mask(struct irq_data *d)
 112 {
 113         struct gpcv2_irqchip_data *cd = d->chip_data;
 114         void __iomem *reg;
 115         u32 val;
 116
 117         raw_spin_lock(&cd->rlock);
 118         reg = gpcv2_idx_to_reg(cd, d->hwirq / 32);
 119         val = readl_relaxed(reg);
 120         val |= BIT(d->hwirq % 32);
 121         writel_relaxed(val, reg);
 122         raw_spin_unlock(&cd->rlock);
 123
 124         irq_chip_mask_parent(d);
 125 }
 126
 127 static struct irq_chip gpcv2_irqchip_data_chip = {
 128         .name                   = "GPCv2",
 129         .irq_eoi                = irq_chip_eoi_parent,
 130         .irq_mask               = imx_gpcv2_irq_mask,
 131         .irq_unmask             = imx_gpcv2_irq_unmask,
 132         .irq_set_wake           = imx_gpcv2_irq_set_wake,
 133         .irq_retrigger          = irq_chip_retrigger_hierarchy,
 134         .irq_set_type           = irq_chip_set_type_parent,
 135 #ifdef CONFIG_SMP
 136         .irq_set_affinity       = irq_chip_set_affinity_parent,
 137 #endif
 138 };
 139
 140 static int imx_gpcv2_domain_translate(struct irq_domain *d,
 141                                       struct irq_fwspec *fwspec,
 142                                       unsigned long *hwirq,
 143                                       unsigned int *type)
 144 {
 145         if (is_of_node(fwspec->fwnode)) {
 146                 if (fwspec->param_count != 3)
 147                         return -EINVAL;
 148
 149                 /* No PPI should point to this domain */
 150                 if (fwspec->param[0] != 0)
 151                         return -EINVAL;
 152
 153                 *hwirq = fwspec->param[1];
 154                 *type = fwspec->param[2];
 155                 return 0;
 156         }
 157
 158         return -EINVAL;
 159 }
 160
 161 static int imx_gpcv2_domain_alloc(struct irq_domain *domain,
 162                                   unsigned int irq, unsigned int nr_irqs,
 163                                   void *data)
 164 {
 165         struct irq_fwspec *fwspec = data;
 166         struct irq_fwspec parent_fwspec;
 167         irq_hw_number_t hwirq;
 168         unsigned int type;
 169         int err;
 170         int i;
 171
 172         err = imx_gpcv2_domain_translate(domain, fwspec, &hwirq, &type);
 173         if (err)
 174                 return err;
 175
 176         if (hwirq >= GPC_MAX_IRQS)
 177                 return -EINVAL;
 178
 179         for (i = 0; i < nr_irqs; i++) {
 180                 irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
 181                                 &gpcv2_irqchip_data_chip, domain->host_data);
 182         }
 183
 184         parent_fwspec = *fwspec;
 185         parent_fwspec.fwnode = domain->parent->fwnode;
 186         return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
 187                                             &parent_fwspec);
 188 }
 189
 190 static const struct irq_domain_ops gpcv2_irqchip_data_domain_ops = {
 191         .translate      = imx_gpcv2_domain_translate,
 192         .alloc          = imx_gpcv2_domain_alloc,
 193         .free           = irq_domain_free_irqs_common,
 194 };
 195
 196 static const struct of_device_id gpcv2_of_match[] = {
 197         { .compatible = "fsl,imx7d-gpc",  .data = (const void *) 2 },
 198         { .compatible = "fsl,imx8mq-gpc", .data = (const void *) 4 },
 199         { /* END */ }
 200 };
 201
 202 static int __init imx_gpcv2_irqchip_init(struct device_node *node,
 203                                struct device_node *parent)
 204 {
 205         struct irq_domain *parent_domain, *domain;
 206         struct gpcv2_irqchip_data *cd;
 207         const struct of_device_id *id;
 208         unsigned long core_num;
 209         int i;
 210
 211         if (!parent) {
 212                 pr_err("%pOF: no parent, giving up\n", node);
 213                 return -ENODEV;
 214         }
 215
 216         id = of_match_node(gpcv2_of_match, node);
 217         if (!id) {
 218                 pr_err("%pOF: unknown compatibility string\n", node);
 219                 return -ENODEV;
 220         }
 221
 222         core_num = (unsigned long)id->data;
 223
 224         parent_domain = irq_find_host(parent);
 225         if (!parent_domain) {
 226                 pr_err("%pOF: unable to get parent domain\n", node);
 227                 return -ENXIO;
 228         }
 229
 230         cd = kzalloc(sizeof(struct gpcv2_irqchip_data), GFP_KERNEL);
 231         if (!cd)
 232                 return -ENOMEM;
 233
 234         raw_spin_lock_init(&cd->rlock);
 235
 236         cd->gpc_base = of_iomap(node, 0);
 237         if (!cd->gpc_base) {
 238                 pr_err("%pOF: unable to map gpc registers\n", node);
 239                 kfree(cd);
 240                 return -ENOMEM;
 241         }
 242
 243         domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
 244                                 node, &gpcv2_irqchip_data_domain_ops, cd);
 245         if (!domain) {
 246                 iounmap(cd->gpc_base);
 247                 kfree(cd);
 248                 return -ENOMEM;
 249         }
 250         irq_set_default_host(domain);
 251
 252         /* Initially mask all interrupts */
 253         for (i = 0; i < IMR_NUM; i++) {
 254                 void __iomem *reg = cd->gpc_base + i * 4;
 255
 256                 switch (core_num) {
 257                 case 4:
 258                         writel_relaxed(~0, reg + GPC_IMR1_CORE2);
 259                         writel_relaxed(~0, reg + GPC_IMR1_CORE3);
 260                         fallthrough;
 261                 case 2:
 262                         writel_relaxed(~0, reg + GPC_IMR1_CORE0);
 263                         writel_relaxed(~0, reg + GPC_IMR1_CORE1);
 264                 }
 265                 cd->wakeup_sources[i] = ~0;
 266         }
 267
 268         /* Let CORE0 as the default CPU to wake up by GPC */
 269         cd->cpu2wakeup = GPC_IMR1_CORE0;
 270
 271         /*
 272          * Due to hardware design failure, need to make sure GPR
 273          * interrupt(#32) is unmasked during RUN mode to avoid entering
 274          * DSM by mistake.
 275          */
 276         writel_relaxed(~0x1, cd->gpc_base + cd->cpu2wakeup);
 277
 278         imx_gpcv2_instance = cd;
 279         register_syscore_ops(&imx_gpcv2_syscore_ops);
 280
 281         /*
 282          * Clear the OF_POPULATED flag set in of_irq_init so that
 283          * later the GPC power domain driver will not be skipped.
 284          */
 285         of_node_clear_flag(node, OF_POPULATED);
 286         return 0;
 287 }
 288
 289 IRQCHIP_DECLARE(imx_gpcv2_imx7d, "fsl,imx7d-gpc", imx_gpcv2_irqchip_init);
 290 IRQCHIP_DECLARE(imx_gpcv2_imx8mq, "fsl,imx8mq-gpc", imx_gpcv2_irqchip_init);