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5b6b7490af
Sometimes we need to program PLLs with a fixed rate
configuration during driver probe. Doing this after we register
the PLLs with the clock framework causes the common clock
framework to assume the rate of the PLLs are 0. This causes all
sorts of problems for rate recalculations because the common
clock framework caches the rate once at registration time unless
a flag is set to always recalculate the rates.
Split the qcom_cc_probe() function into two pieces, map and
everything else, so that drivers which need to configure some
PLL rates or otherwise twiddle bits in the clock controller can
do so before registering clocks. This allows us to properly
detect the rates of PLLs that are programmed at boot.
Fixes: 49fc825f0c "clk: qcom: Consolidate common probe code"
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*
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* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/export.h>
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#include <linux/regmap.h>
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#include <linux/platform_device.h>
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#include <linux/clk-provider.h>
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#include <linux/reset-controller.h>
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#include "common.h"
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#include "clk-regmap.h"
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#include "reset.h"
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struct qcom_cc {
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struct qcom_reset_controller reset;
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struct clk_onecell_data data;
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struct clk *clks[];
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};
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struct regmap *
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qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
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{
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void __iomem *base;
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struct resource *res;
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struct device *dev = &pdev->dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(dev, res);
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if (IS_ERR(base))
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return ERR_CAST(base);
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return devm_regmap_init_mmio(dev, base, desc->config);
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}
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EXPORT_SYMBOL_GPL(qcom_cc_map);
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int qcom_cc_really_probe(struct platform_device *pdev,
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const struct qcom_cc_desc *desc, struct regmap *regmap)
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{
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int i, ret;
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struct device *dev = &pdev->dev;
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struct clk *clk;
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struct clk_onecell_data *data;
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struct clk **clks;
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struct qcom_reset_controller *reset;
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struct qcom_cc *cc;
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size_t num_clks = desc->num_clks;
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struct clk_regmap **rclks = desc->clks;
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cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks,
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GFP_KERNEL);
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if (!cc)
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return -ENOMEM;
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clks = cc->clks;
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data = &cc->data;
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data->clks = clks;
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data->clk_num = num_clks;
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for (i = 0; i < num_clks; i++) {
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if (!rclks[i]) {
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clks[i] = ERR_PTR(-ENOENT);
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continue;
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}
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clk = devm_clk_register_regmap(dev, rclks[i]);
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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clks[i] = clk;
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}
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ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data);
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if (ret)
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return ret;
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reset = &cc->reset;
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reset->rcdev.of_node = dev->of_node;
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reset->rcdev.ops = &qcom_reset_ops;
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reset->rcdev.owner = dev->driver->owner;
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reset->rcdev.nr_resets = desc->num_resets;
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reset->regmap = regmap;
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reset->reset_map = desc->resets;
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platform_set_drvdata(pdev, &reset->rcdev);
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ret = reset_controller_register(&reset->rcdev);
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if (ret)
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of_clk_del_provider(dev->of_node);
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return ret;
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}
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EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
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int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
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{
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struct regmap *regmap;
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regmap = qcom_cc_map(pdev, desc);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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return qcom_cc_really_probe(pdev, desc, regmap);
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}
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EXPORT_SYMBOL_GPL(qcom_cc_probe);
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void qcom_cc_remove(struct platform_device *pdev)
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{
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of_clk_del_provider(pdev->dev.of_node);
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reset_controller_unregister(platform_get_drvdata(pdev));
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}
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EXPORT_SYMBOL_GPL(qcom_cc_remove);
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