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+ struct regmap *gcb_ctrl; + struct reset_controller_dev rcdev; +}; + +static int sparx5_switch_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct mchp_reset_context *ctx = + container_of(rcdev, struct mchp_reset_context, rcdev); + u32 val; + + /* Make sure the core is PROTECTED from reset */ + regmap_update_bits(ctx->cpu_ctrl, PROTECT_REG, PROTECT_BIT, PROTECT_BIT); + + /* Start soft reset */ + regmap_write(ctx->gcb_ctrl, SOFT_RESET_REG, SOFT_RESET_BIT); + + /* Wait for soft reset done */ + return regmap_read_poll_timeout(ctx->gcb_ctrl, SOFT_RESET_REG, val, + (val & SOFT_RESET_BIT) == 0, + 1, 100); +} + +static const struct reset_control_ops sparx5_reset_ops = { + .reset = sparx5_switch_reset, +}; + +static int mchp_sparx5_reset_probe(struct platform_device *pdev) +{ + struct device_node *dn = pdev->dev.of_node; + struct regmap *cpu_ctrl, *gcb_ctrl; + struct device *dev = &pdev->dev; + struct mchp_reset_context *ctx; + struct device_node *syscon_np; + int err; + + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + syscon_np = of_parse_phandle(dn, "cpu-syscon", 0); + if (!syscon_np) + return -ENODEV; + cpu_ctrl = syscon_node_to_regmap(syscon_np); + of_node_put(syscon_np); + if (IS_ERR(cpu_ctrl)) { + err = PTR_ERR(cpu_ctrl); + dev_err(dev, "No cpu-syscon map: %d\n", err); + return err; + } + + syscon_np = of_parse_phandle(dn, "gcb-syscon", 0); + if (!syscon_np) + return -ENODEV; + gcb_ctrl = syscon_node_to_regmap(syscon_np); + of_node_put(syscon_np); + if (IS_ERR(gcb_ctrl)) { + err = PTR_ERR(gcb_ctrl); + dev_err(dev, "No gcb-syscon map: %d\n", err); + return err; + } + + ctx->cpu_ctrl = cpu_ctrl; + ctx->gcb_ctrl = gcb_ctrl; + + ctx->rcdev.owner = THIS_MODULE; + ctx->rcdev.nr_resets = 1; + ctx->rcdev.ops = &sparx5_reset_ops; + ctx->rcdev.of_node = dn; + + return devm_reset_controller_register(dev, &ctx->rcdev); +} + +static const struct of_device_id mchp_sparx5_reset_of_match[] = { + { + .compatible = "microchip,sparx5-switch-reset", + }, + { /*sentinel*/ } +}; + +static struct platform_driver mchp_sparx5_reset_driver = { + .probe = mchp_sparx5_reset_probe, + .driver = { + .name = "sparx5-switch-reset", + .of_match_table = mchp_sparx5_reset_of_match, + }, +}; + +static int __init mchp_sparx5_reset_init(void) +{ + return platform_driver_register(&mchp_sparx5_reset_driver); +} + +postcore_initcall(mchp_sparx5_reset_init); + +MODULE_DESCRIPTION("Microchip Sparx5 switch reset driver"); +MODULE_AUTHOR("Steen Hegelund "); +MODULE_LICENSE("Dual MIT/GPL");