mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-19 16:38:53 +09:00
174 lines
4.2 KiB
C
174 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2019 NXP
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*/
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#include <common.h>
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#include <log.h>
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#include <asm/io.h>
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#include <malloc.h>
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#include <clk-uclass.h>
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#include <dm/device.h>
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#include <dm/devres.h>
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#include <linux/clk-provider.h>
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#include <clk.h>
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#include "clk.h"
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#include <linux/err.h>
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#define UBOOT_DM_CLK_IMX_COMPOSITE "imx_clk_composite"
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#define PCG_PREDIV_SHIFT 16
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#define PCG_PREDIV_WIDTH 3
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#define PCG_PREDIV_MAX 8
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#define PCG_DIV_SHIFT 0
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#define PCG_DIV_WIDTH 6
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#define PCG_DIV_MAX 64
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#define PCG_PCS_SHIFT 24
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#define PCG_PCS_MASK 0x7
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#define PCG_CGC_SHIFT 28
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static unsigned long imx8m_clk_composite_divider_recalc_rate(struct clk *clk)
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{
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struct clk_divider *divider = (struct clk_divider *)to_clk_divider(clk);
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struct clk_composite *composite = (struct clk_composite *)clk->data;
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ulong parent_rate = clk_get_parent_rate(&composite->clk);
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unsigned long prediv_rate;
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unsigned int prediv_value;
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unsigned int div_value;
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debug("%s: name %s prate: %lu reg: %p\n", __func__,
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(&composite->clk)->dev->name, parent_rate, divider->reg);
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prediv_value = readl(divider->reg) >> divider->shift;
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prediv_value &= clk_div_mask(divider->width);
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prediv_rate = divider_recalc_rate(clk, parent_rate, prediv_value,
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NULL, divider->flags,
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divider->width);
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div_value = readl(divider->reg) >> PCG_DIV_SHIFT;
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div_value &= clk_div_mask(PCG_DIV_WIDTH);
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return divider_recalc_rate(clk, prediv_rate, div_value, NULL,
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divider->flags, PCG_DIV_WIDTH);
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}
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static int imx8m_clk_composite_compute_dividers(unsigned long rate,
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unsigned long parent_rate,
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int *prediv, int *postdiv)
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{
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int div1, div2;
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int error = INT_MAX;
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int ret = -EINVAL;
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*prediv = 1;
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*postdiv = 1;
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for (div1 = 1; div1 <= PCG_PREDIV_MAX; div1++) {
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for (div2 = 1; div2 <= PCG_DIV_MAX; div2++) {
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int new_error = ((parent_rate / div1) / div2) - rate;
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if (abs(new_error) < abs(error)) {
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*prediv = div1;
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*postdiv = div2;
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error = new_error;
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ret = 0;
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}
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}
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}
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return ret;
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}
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/*
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* The clk are bound to a dev, because it is part of composite clk
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* use composite clk to get dev
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*/
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static ulong imx8m_clk_composite_divider_set_rate(struct clk *clk,
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unsigned long rate)
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{
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struct clk_divider *divider = (struct clk_divider *)to_clk_divider(clk);
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struct clk_composite *composite = (struct clk_composite *)clk->data;
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ulong parent_rate = clk_get_parent_rate(&composite->clk);
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int prediv_value;
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int div_value;
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int ret;
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u32 val;
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ret = imx8m_clk_composite_compute_dividers(rate, parent_rate,
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&prediv_value, &div_value);
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if (ret)
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return ret;
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val = readl(divider->reg);
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val &= ~((clk_div_mask(divider->width) << divider->shift) |
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(clk_div_mask(PCG_DIV_WIDTH) << PCG_DIV_SHIFT));
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val |= (u32)(prediv_value - 1) << divider->shift;
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val |= (u32)(div_value - 1) << PCG_DIV_SHIFT;
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writel(val, divider->reg);
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return clk_get_rate(&composite->clk);
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}
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static const struct clk_ops imx8m_clk_composite_divider_ops = {
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.get_rate = imx8m_clk_composite_divider_recalc_rate,
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.set_rate = imx8m_clk_composite_divider_set_rate,
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};
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struct clk *imx8m_clk_composite_flags(const char *name,
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const char * const *parent_names,
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int num_parents, void __iomem *reg,
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unsigned long flags)
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{
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struct clk *clk = ERR_PTR(-ENOMEM);
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struct clk_divider *div = NULL;
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struct clk_gate *gate = NULL;
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struct clk_mux *mux = NULL;
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mux = kzalloc(sizeof(*mux), GFP_KERNEL);
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if (!mux)
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goto fail;
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mux->reg = reg;
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mux->shift = PCG_PCS_SHIFT;
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mux->mask = PCG_PCS_MASK;
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mux->num_parents = num_parents;
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mux->flags = flags;
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mux->parent_names = parent_names;
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div = kzalloc(sizeof(*div), GFP_KERNEL);
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if (!div)
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goto fail;
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div->reg = reg;
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div->shift = PCG_PREDIV_SHIFT;
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div->width = PCG_PREDIV_WIDTH;
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div->flags = CLK_DIVIDER_ROUND_CLOSEST | flags;
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gate = kzalloc(sizeof(*gate), GFP_KERNEL);
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if (!gate)
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goto fail;
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gate->reg = reg;
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gate->bit_idx = PCG_CGC_SHIFT;
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gate->flags = flags;
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clk = clk_register_composite(NULL, name,
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parent_names, num_parents,
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&mux->clk, &clk_mux_ops, &div->clk,
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&imx8m_clk_composite_divider_ops,
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&gate->clk, &clk_gate_ops, flags);
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if (IS_ERR(clk))
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goto fail;
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return clk;
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fail:
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kfree(gate);
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kfree(div);
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kfree(mux);
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return ERR_CAST(clk);
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}
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