diff options
Diffstat (limited to 'drivers/clk/x86/clk-pmc-atom.c')
| -rw-r--r-- | drivers/clk/x86/clk-pmc-atom.c | 51 |
1 files changed, 22 insertions, 29 deletions
diff --git a/drivers/clk/x86/clk-pmc-atom.c b/drivers/clk/x86/clk-pmc-atom.c index 08ef69945ffb..99291ba65da7 100644 --- a/drivers/clk/x86/clk-pmc-atom.c +++ b/drivers/clk/x86/clk-pmc-atom.c @@ -1,40 +1,22 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Intel Atom platform clocks driver for BayTrail and CherryTrail SoCs * * Copyright (C) 2016, Intel Corporation * Author: Irina Tirdea <irina.tirdea@intel.com> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. */ #include <linux/clk-provider.h> #include <linux/clkdev.h> #include <linux/err.h> +#include <linux/io.h> #include <linux/platform_data/x86/clk-pmc-atom.h> +#include <linux/platform_data/x86/pmc_atom.h> #include <linux/platform_device.h> #include <linux/slab.h> #define PLT_CLK_NAME_BASE "pmc_plt_clk" -#define PMC_CLK_CTL_OFFSET 0x60 -#define PMC_CLK_CTL_SIZE 4 -#define PMC_CLK_NUM 6 -#define PMC_CLK_CTL_GATED_ON_D3 0x0 -#define PMC_CLK_CTL_FORCE_ON 0x1 -#define PMC_CLK_CTL_FORCE_OFF 0x2 -#define PMC_CLK_CTL_RESERVED 0x3 -#define PMC_MASK_CLK_CTL GENMASK(1, 0) -#define PMC_MASK_CLK_FREQ BIT(2) -#define PMC_CLK_FREQ_XTAL (0 << 2) /* 25 MHz */ -#define PMC_CLK_FREQ_PLL (1 << 2) /* 19.2 MHz */ - struct clk_plt_fixed { struct clk_hw *clk; struct clk_lookup *lookup; @@ -55,6 +37,7 @@ struct clk_plt_data { u8 nparents; struct clk_plt *clks[PMC_CLK_NUM]; struct clk_lookup *mclk_lookup; + struct clk_lookup *ether_clk_lookup; }; /* Return an index in parent table */ @@ -164,7 +147,7 @@ static const struct clk_ops plt_clk_ops = { }; static struct clk_plt *plt_clk_register(struct platform_device *pdev, int id, - void __iomem *base, + const struct pmc_clk_data *pmc_data, const char **parent_names, int num_parents) { @@ -183,14 +166,15 @@ static struct clk_plt *plt_clk_register(struct platform_device *pdev, int id, init.num_parents = num_parents; pclk->hw.init = &init; - pclk->reg = base + PMC_CLK_CTL_OFFSET + id * PMC_CLK_CTL_SIZE; + pclk->reg = pmc_data->base + PMC_CLK_CTL_OFFSET + id * PMC_CLK_CTL_SIZE; spin_lock_init(&pclk->lock); /* - * If the clock was already enabled by the firmware mark it as critical - * to avoid it being gated by the clock framework if no driver owns it. + * On some systems, the pmc_plt_clocks already enabled by the + * firmware are being marked as critical to avoid them being + * gated by the clock framework. */ - if (plt_clk_is_enabled(&pclk->hw)) + if (pmc_data->critical && plt_clk_is_enabled(&pclk->hw)) init.flags |= CLK_IS_CRITICAL; ret = devm_clk_hw_register(&pdev->dev, &pclk->hw); @@ -338,7 +322,7 @@ static int plt_clk_probe(struct platform_device *pdev) return PTR_ERR(parent_names); for (i = 0; i < PMC_CLK_NUM; i++) { - data->clks[i] = plt_clk_register(pdev, i, pmc_data->base, + data->clks[i] = plt_clk_register(pdev, i, pmc_data, parent_names, data->nparents); if (IS_ERR(data->clks[i])) { err = PTR_ERR(data->clks[i]); @@ -351,11 +335,20 @@ static int plt_clk_probe(struct platform_device *pdev) goto err_unreg_clk_plt; } + data->ether_clk_lookup = clkdev_hw_create(&data->clks[4]->hw, + "ether_clk", NULL); + if (!data->ether_clk_lookup) { + err = -ENOMEM; + goto err_drop_mclk; + } + plt_clk_free_parent_names_loop(parent_names, data->nparents); platform_set_drvdata(pdev, data); return 0; +err_drop_mclk: + clkdev_drop(data->mclk_lookup); err_unreg_clk_plt: plt_clk_unregister_loop(data, i); plt_clk_unregister_parents(data); @@ -363,16 +356,16 @@ err_unreg_clk_plt: return err; } -static int plt_clk_remove(struct platform_device *pdev) +static void plt_clk_remove(struct platform_device *pdev) { struct clk_plt_data *data; data = platform_get_drvdata(pdev); + clkdev_drop(data->ether_clk_lookup); clkdev_drop(data->mclk_lookup); plt_clk_unregister_loop(data, PMC_CLK_NUM); plt_clk_unregister_parents(data); - return 0; } static struct platform_driver plt_clk_driver = { |