123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright 2020 Cerno
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#include <linux/clk-provider.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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#include <linux/reset/reset-simple.h>
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#define DVP_HT_RPI_SW_INIT 0x04
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#define DVP_HT_RPI_MISC_CONFIG 0x08
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#define NR_CLOCKS 2
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#define NR_RESETS 6
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struct clk_dvp {
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struct clk_hw_onecell_data *data;
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struct reset_simple_data reset;
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};
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static const struct clk_parent_data clk_dvp_parent = {
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.index = 0,
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};
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static int clk_dvp_probe(struct platform_device *pdev)
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{
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struct clk_hw_onecell_data *data;
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struct clk_dvp *dvp;
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void __iomem *base;
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int ret;
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dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL);
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if (!dvp)
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return -ENOMEM;
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platform_set_drvdata(pdev, dvp);
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dvp->data = devm_kzalloc(&pdev->dev,
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struct_size(dvp->data, hws, NR_CLOCKS),
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GFP_KERNEL);
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if (!dvp->data)
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return -ENOMEM;
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data = dvp->data;
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base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(base))
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return PTR_ERR(base);
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dvp->reset.rcdev.owner = THIS_MODULE;
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dvp->reset.rcdev.nr_resets = NR_RESETS;
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dvp->reset.rcdev.ops = &reset_simple_ops;
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dvp->reset.rcdev.of_node = pdev->dev.of_node;
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dvp->reset.membase = base + DVP_HT_RPI_SW_INIT;
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spin_lock_init(&dvp->reset.lock);
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ret = devm_reset_controller_register(&pdev->dev, &dvp->reset.rcdev);
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if (ret)
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return ret;
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data->hws[0] = clk_hw_register_gate_parent_data(&pdev->dev,
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"hdmi0-108MHz",
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&clk_dvp_parent, 0,
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base + DVP_HT_RPI_MISC_CONFIG, 3,
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CLK_GATE_SET_TO_DISABLE,
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&dvp->reset.lock);
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if (IS_ERR(data->hws[0]))
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return PTR_ERR(data->hws[0]);
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data->hws[1] = clk_hw_register_gate_parent_data(&pdev->dev,
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"hdmi1-108MHz",
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&clk_dvp_parent, 0,
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base + DVP_HT_RPI_MISC_CONFIG, 4,
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CLK_GATE_SET_TO_DISABLE,
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&dvp->reset.lock);
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if (IS_ERR(data->hws[1])) {
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ret = PTR_ERR(data->hws[1]);
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goto unregister_clk0;
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}
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data->num = NR_CLOCKS;
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ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
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data);
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if (ret)
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goto unregister_clk1;
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return 0;
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unregister_clk1:
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clk_hw_unregister_gate(data->hws[1]);
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unregister_clk0:
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clk_hw_unregister_gate(data->hws[0]);
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return ret;
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};
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static void clk_dvp_remove(struct platform_device *pdev)
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{
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struct clk_dvp *dvp = platform_get_drvdata(pdev);
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struct clk_hw_onecell_data *data = dvp->data;
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clk_hw_unregister_gate(data->hws[1]);
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clk_hw_unregister_gate(data->hws[0]);
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}
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static const struct of_device_id clk_dvp_dt_ids[] = {
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{ .compatible = "brcm,brcm2711-dvp", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, clk_dvp_dt_ids);
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static struct platform_driver clk_dvp_driver = {
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.probe = clk_dvp_probe,
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.remove_new = clk_dvp_remove,
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.driver = {
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.name = "brcm2711-dvp",
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.of_match_table = clk_dvp_dt_ids,
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},
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};
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module_platform_driver(clk_dvp_driver);
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MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
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MODULE_DESCRIPTION("BCM2711 DVP clock driver");
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MODULE_LICENSE("GPL");
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