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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2019 DENX Software Engineering
- * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
- *
- * Copyright (C) 2011 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
- * Copyright (C) 2011 Richard Zhao, Linaro <richard.zhao@linaro.org>
- * Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org>
- *
- */
- #include <common.h>
- #include <asm/io.h>
- #include <malloc.h>
- #include <clk-uclass.h>
- #include <dm/device.h>
- #include <dm/devres.h>
- #include <dm/uclass.h>
- #include <dm/lists.h>
- #include <dm/device-internal.h>
- #include <linux/bug.h>
- #include <linux/clk-provider.h>
- #include <linux/err.h>
- #include <linux/log2.h>
- #include <div64.h>
- #include <clk.h>
- #include "clk.h"
- #define UBOOT_DM_CLK_CCF_DIVIDER "ccf_clk_divider"
- static unsigned int _get_table_div(const struct clk_div_table *table,
- unsigned int val)
- {
- const struct clk_div_table *clkt;
- for (clkt = table; clkt->div; clkt++)
- if (clkt->val == val)
- return clkt->div;
- return 0;
- }
- static unsigned int _get_div(const struct clk_div_table *table,
- unsigned int val, unsigned long flags, u8 width)
- {
- if (flags & CLK_DIVIDER_ONE_BASED)
- return val;
- if (flags & CLK_DIVIDER_POWER_OF_TWO)
- return 1 << val;
- if (flags & CLK_DIVIDER_MAX_AT_ZERO)
- return val ? val : clk_div_mask(width) + 1;
- if (table)
- return _get_table_div(table, val);
- return val + 1;
- }
- unsigned long divider_recalc_rate(struct clk *hw, unsigned long parent_rate,
- unsigned int val,
- const struct clk_div_table *table,
- unsigned long flags, unsigned long width)
- {
- unsigned int div;
- div = _get_div(table, val, flags, width);
- if (!div) {
- WARN(!(flags & CLK_DIVIDER_ALLOW_ZERO),
- "%s: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set\n",
- clk_hw_get_name(hw));
- return parent_rate;
- }
- return DIV_ROUND_UP_ULL((u64)parent_rate, div);
- }
- static ulong clk_divider_recalc_rate(struct clk *clk)
- {
- struct clk_divider *divider = to_clk_divider(clk);
- unsigned long parent_rate = clk_get_parent_rate(clk);
- unsigned int val;
- #if CONFIG_IS_ENABLED(SANDBOX_CLK_CCF)
- val = divider->io_divider_val;
- #else
- val = readl(divider->reg);
- #endif
- val >>= divider->shift;
- val &= clk_div_mask(divider->width);
- return divider_recalc_rate(clk, parent_rate, val, divider->table,
- divider->flags, divider->width);
- }
- static bool _is_valid_table_div(const struct clk_div_table *table,
- unsigned int div)
- {
- const struct clk_div_table *clkt;
- for (clkt = table; clkt->div; clkt++)
- if (clkt->div == div)
- return true;
- return false;
- }
- static bool _is_valid_div(const struct clk_div_table *table, unsigned int div,
- unsigned long flags)
- {
- if (flags & CLK_DIVIDER_POWER_OF_TWO)
- return is_power_of_2(div);
- if (table)
- return _is_valid_table_div(table, div);
- return true;
- }
- static unsigned int _get_table_val(const struct clk_div_table *table,
- unsigned int div)
- {
- const struct clk_div_table *clkt;
- for (clkt = table; clkt->div; clkt++)
- if (clkt->div == div)
- return clkt->val;
- return 0;
- }
- static unsigned int _get_val(const struct clk_div_table *table,
- unsigned int div, unsigned long flags, u8 width)
- {
- if (flags & CLK_DIVIDER_ONE_BASED)
- return div;
- if (flags & CLK_DIVIDER_POWER_OF_TWO)
- return __ffs(div);
- if (flags & CLK_DIVIDER_MAX_AT_ZERO)
- return (div == clk_div_mask(width) + 1) ? 0 : div;
- if (table)
- return _get_table_val(table, div);
- return div - 1;
- }
- int divider_get_val(unsigned long rate, unsigned long parent_rate,
- const struct clk_div_table *table, u8 width,
- unsigned long flags)
- {
- unsigned int div, value;
- div = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
- if (!_is_valid_div(table, div, flags))
- return -EINVAL;
- value = _get_val(table, div, flags, width);
- return min_t(unsigned int, value, clk_div_mask(width));
- }
- static ulong clk_divider_set_rate(struct clk *clk, unsigned long rate)
- {
- struct clk_divider *divider = to_clk_divider(clk);
- unsigned long parent_rate = clk_get_parent_rate(clk);
- int value;
- u32 val;
- value = divider_get_val(rate, parent_rate, divider->table,
- divider->width, divider->flags);
- if (value < 0)
- return value;
- if (divider->flags & CLK_DIVIDER_HIWORD_MASK) {
- val = clk_div_mask(divider->width) << (divider->shift + 16);
- } else {
- val = readl(divider->reg);
- val &= ~(clk_div_mask(divider->width) << divider->shift);
- }
- val |= (u32)value << divider->shift;
- writel(val, divider->reg);
- return clk_get_rate(clk);
- }
- const struct clk_ops clk_divider_ops = {
- .get_rate = clk_divider_recalc_rate,
- .set_rate = clk_divider_set_rate,
- };
- static struct clk *_register_divider(struct device *dev, const char *name,
- const char *parent_name, unsigned long flags,
- void __iomem *reg, u8 shift, u8 width,
- u8 clk_divider_flags, const struct clk_div_table *table)
- {
- struct clk_divider *div;
- struct clk *clk;
- int ret;
- if (clk_divider_flags & CLK_DIVIDER_HIWORD_MASK) {
- if (width + shift > 16) {
- pr_warn("divider value exceeds LOWORD field\n");
- return ERR_PTR(-EINVAL);
- }
- }
- /* allocate the divider */
- div = kzalloc(sizeof(*div), GFP_KERNEL);
- if (!div)
- return ERR_PTR(-ENOMEM);
- /* struct clk_divider assignments */
- div->reg = reg;
- div->shift = shift;
- div->width = width;
- div->flags = clk_divider_flags;
- div->table = table;
- #if CONFIG_IS_ENABLED(SANDBOX_CLK_CCF)
- div->io_divider_val = *(u32 *)reg;
- #endif
- /* register the clock */
- clk = &div->clk;
- clk->flags = flags;
- ret = clk_register(clk, UBOOT_DM_CLK_CCF_DIVIDER, name, parent_name);
- if (ret) {
- kfree(div);
- return ERR_PTR(ret);
- }
- return clk;
- }
- struct clk *clk_register_divider(struct device *dev, const char *name,
- const char *parent_name, unsigned long flags,
- void __iomem *reg, u8 shift, u8 width,
- u8 clk_divider_flags)
- {
- struct clk *clk;
- clk = _register_divider(dev, name, parent_name, flags, reg, shift,
- width, clk_divider_flags, NULL);
- if (IS_ERR(clk))
- return ERR_CAST(clk);
- return clk;
- }
- U_BOOT_DRIVER(ccf_clk_divider) = {
- .name = UBOOT_DM_CLK_CCF_DIVIDER,
- .id = UCLASS_CLK,
- .ops = &clk_divider_ops,
- .flags = DM_FLAG_PRE_RELOC,
- };
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