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101 lines
2.2 KiB
101 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* clkgen-mux.c: ST GEN-MUX Clock driver |
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* |
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* Copyright (C) 2014 STMicroelectronics (R&D) Limited |
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* |
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* Authors: Stephen Gallimore <[email protected]> |
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* Pankaj Dev <[email protected]> |
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*/ |
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#include <linux/slab.h> |
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#include <linux/io.h> |
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#include <linux/of_address.h> |
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#include <linux/clk.h> |
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#include <linux/clk-provider.h> |
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#include "clkgen.h" |
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static const char ** __init clkgen_mux_get_parents(struct device_node *np, |
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int *num_parents) |
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{ |
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const char **parents; |
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unsigned int nparents; |
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nparents = of_clk_get_parent_count(np); |
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if (WARN_ON(!nparents)) |
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return ERR_PTR(-EINVAL); |
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parents = kcalloc(nparents, sizeof(const char *), GFP_KERNEL); |
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if (!parents) |
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return ERR_PTR(-ENOMEM); |
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*num_parents = of_clk_parent_fill(np, parents, nparents); |
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return parents; |
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} |
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struct clkgen_mux_data { |
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u32 offset; |
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u8 shift; |
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u8 width; |
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spinlock_t *lock; |
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unsigned long clk_flags; |
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u8 mux_flags; |
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}; |
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static struct clkgen_mux_data stih407_a9_mux_data = { |
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.offset = 0x1a4, |
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.shift = 0, |
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.width = 2, |
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.lock = &clkgen_a9_lock, |
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}; |
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static void __init st_of_clkgen_mux_setup(struct device_node *np, |
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struct clkgen_mux_data *data) |
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{ |
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struct clk *clk; |
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void __iomem *reg; |
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const char **parents; |
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int num_parents = 0; |
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reg = of_iomap(np, 0); |
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if (!reg) { |
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pr_err("%s: Failed to get base address\n", __func__); |
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return; |
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} |
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parents = clkgen_mux_get_parents(np, &num_parents); |
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if (IS_ERR(parents)) { |
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pr_err("%s: Failed to get parents (%ld)\n", |
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__func__, PTR_ERR(parents)); |
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goto err_parents; |
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} |
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clk = clk_register_mux(NULL, np->name, parents, num_parents, |
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data->clk_flags | CLK_SET_RATE_PARENT, |
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reg + data->offset, |
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data->shift, data->width, data->mux_flags, |
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data->lock); |
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if (IS_ERR(clk)) |
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goto err; |
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pr_debug("%s: parent %s rate %u\n", |
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__clk_get_name(clk), |
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__clk_get_name(clk_get_parent(clk)), |
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(unsigned int)clk_get_rate(clk)); |
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kfree(parents); |
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of_clk_add_provider(np, of_clk_src_simple_get, clk); |
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return; |
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err: |
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kfree(parents); |
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err_parents: |
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iounmap(reg); |
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} |
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static void __init st_of_clkgen_a9_mux_setup(struct device_node *np) |
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{ |
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st_of_clkgen_mux_setup(np, &stih407_a9_mux_data); |
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} |
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CLK_OF_DECLARE(clkgen_a9mux, "st,stih407-clkgen-a9-mux", |
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st_of_clkgen_a9_mux_setup);
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