147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/* Microchip Sparx5 Switch Reset driver
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*
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* Copyright (c) 2020 Microchip Technology Inc. and its subsidiaries.
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*
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* The Sparx5 Chip Register Model can be browsed at this location:
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* https://github.com/microchip-ung/sparx-5_reginfo
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*/
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#include <linux/mfd/syscon.h>
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#include <linux/of_device.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/reset-controller.h>
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#define PROTECT_REG 0x84
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#define PROTECT_BIT BIT(10)
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#define SOFT_RESET_REG 0x00
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#define SOFT_RESET_BIT BIT(1)
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struct mchp_reset_context {
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struct regmap *cpu_ctrl;
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struct regmap *gcb_ctrl;
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struct reset_controller_dev rcdev;
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};
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static struct regmap_config sparx5_reset_regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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};
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static int sparx5_switch_reset(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct mchp_reset_context *ctx =
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container_of(rcdev, struct mchp_reset_context, rcdev);
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u32 val;
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/* Make sure the core is PROTECTED from reset */
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regmap_update_bits(ctx->cpu_ctrl, PROTECT_REG, PROTECT_BIT, PROTECT_BIT);
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/* Start soft reset */
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regmap_write(ctx->gcb_ctrl, SOFT_RESET_REG, SOFT_RESET_BIT);
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/* Wait for soft reset done */
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return regmap_read_poll_timeout(ctx->gcb_ctrl, SOFT_RESET_REG, val,
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(val & SOFT_RESET_BIT) == 0,
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1, 100);
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}
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static const struct reset_control_ops sparx5_reset_ops = {
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.reset = sparx5_switch_reset,
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};
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static int mchp_sparx5_map_syscon(struct platform_device *pdev, char *name,
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struct regmap **target)
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{
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struct device_node *syscon_np;
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struct regmap *regmap;
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int err;
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syscon_np = of_parse_phandle(pdev->dev.of_node, name, 0);
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if (!syscon_np)
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return -ENODEV;
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regmap = syscon_node_to_regmap(syscon_np);
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of_node_put(syscon_np);
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if (IS_ERR(regmap)) {
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err = PTR_ERR(regmap);
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dev_err(&pdev->dev, "No '%s' map: %d\n", name, err);
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return err;
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}
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*target = regmap;
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return 0;
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}
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static int mchp_sparx5_map_io(struct platform_device *pdev, int index,
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struct regmap **target)
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{
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struct resource *res;
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struct regmap *map;
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void __iomem *mem;
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mem = devm_platform_get_and_ioremap_resource(pdev, index, &res);
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if (IS_ERR(mem)) {
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dev_err(&pdev->dev, "Could not map resource %d\n", index);
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return PTR_ERR(mem);
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}
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sparx5_reset_regmap_config.name = res->name;
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map = devm_regmap_init_mmio(&pdev->dev, mem, &sparx5_reset_regmap_config);
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if (IS_ERR(map))
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return PTR_ERR(map);
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*target = map;
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return 0;
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}
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static int mchp_sparx5_reset_probe(struct platform_device *pdev)
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{
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struct device_node *dn = pdev->dev.of_node;
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struct mchp_reset_context *ctx;
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int err;
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ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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err = mchp_sparx5_map_syscon(pdev, "cpu-syscon", &ctx->cpu_ctrl);
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if (err)
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return err;
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err = mchp_sparx5_map_io(pdev, 0, &ctx->gcb_ctrl);
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if (err)
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return err;
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ctx->rcdev.owner = THIS_MODULE;
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ctx->rcdev.nr_resets = 1;
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ctx->rcdev.ops = &sparx5_reset_ops;
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ctx->rcdev.of_node = dn;
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return devm_reset_controller_register(&pdev->dev, &ctx->rcdev);
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}
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static const struct of_device_id mchp_sparx5_reset_of_match[] = {
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{
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.compatible = "microchip,sparx5-switch-reset",
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},
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{ }
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};
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static struct platform_driver mchp_sparx5_reset_driver = {
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.probe = mchp_sparx5_reset_probe,
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.driver = {
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.name = "sparx5-switch-reset",
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.of_match_table = mchp_sparx5_reset_of_match,
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},
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};
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static int __init mchp_sparx5_reset_init(void)
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{
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return platform_driver_register(&mchp_sparx5_reset_driver);
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}
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postcore_initcall(mchp_sparx5_reset_init);
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MODULE_DESCRIPTION("Microchip Sparx5 switch reset driver");
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MODULE_AUTHOR("Steen Hegelund <steen.hegelund@microchip.com>");
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MODULE_LICENSE("Dual MIT/GPL");
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