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![Horatiu Vultur](/assets/img/avatar_default.png)
This patch extends sparx5 driver to support also the lan966x. The process to reset the switch is the same only it has different offsets. Therefore make the driver more generic and add support for lan966x. Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Steen Hegelund <steen.hegelund@microchip.com> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Link: https://lore.kernel.org/r/20211018091522.1113510-3-horatiu.vultur@microchip.com Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
170 lines
4.2 KiB
C
170 lines
4.2 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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struct reset_props {
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u32 protect_reg;
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u32 protect_bit;
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u32 reset_reg;
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u32 reset_bit;
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};
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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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const struct reset_props *props;
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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, ctx->props->protect_reg,
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ctx->props->protect_bit, ctx->props->protect_bit);
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/* Start soft reset */
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regmap_write(ctx->gcb_ctrl, ctx->props->reset_reg,
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ctx->props->reset_bit);
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/* Wait for soft reset done */
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return regmap_read_poll_timeout(ctx->gcb_ctrl, ctx->props->reset_reg, val,
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(val & ctx->props->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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ctx->props = device_get_match_data(&pdev->dev);
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return devm_reset_controller_register(&pdev->dev, &ctx->rcdev);
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}
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static const struct reset_props reset_props_sparx5 = {
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.protect_reg = 0x84,
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.protect_bit = BIT(10),
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.reset_reg = 0x0,
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.reset_bit = BIT(1),
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};
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static const struct reset_props reset_props_lan966x = {
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.protect_reg = 0x88,
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.protect_bit = BIT(5),
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.reset_reg = 0x0,
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.reset_bit = BIT(1),
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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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.data = &reset_props_sparx5,
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}, {
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.compatible = "microchip,lan966x-switch-reset",
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.data = &reset_props_lan966x,
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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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