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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c0156e5509
This flag doesn't look to be used by any code, just set in various clk init structures and then never tested again. Remove it from these drivers as it doesn't provide any benefit. Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: <uclinux-h8-devel@lists.sourceforge.jp> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
145 lines
3.1 KiB
C
145 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* H8S2678 clock driver
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*
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* Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
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*/
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#include <linux/clk-provider.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/of_address.h>
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#include <linux/slab.h>
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static DEFINE_SPINLOCK(clklock);
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#define MAX_FREQ 33333333
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#define MIN_FREQ 8000000
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struct pll_clock {
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struct clk_hw hw;
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void __iomem *sckcr;
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void __iomem *pllcr;
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};
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#define to_pll_clock(_hw) container_of(_hw, struct pll_clock, hw)
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static unsigned long pll_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct pll_clock *pll_clock = to_pll_clock(hw);
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int mul = 1 << (readb(pll_clock->pllcr) & 3);
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return parent_rate * mul;
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}
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static long pll_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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int i, m = -1;
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long offset[3];
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if (rate > MAX_FREQ)
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rate = MAX_FREQ;
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if (rate < MIN_FREQ)
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rate = MIN_FREQ;
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for (i = 0; i < 3; i++)
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offset[i] = abs(rate - (*prate * (1 << i)));
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for (i = 0; i < 3; i++)
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if (m < 0)
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m = i;
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else
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m = (offset[i] < offset[m])?i:m;
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return *prate * (1 << m);
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}
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static int pll_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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int pll;
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unsigned char val;
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unsigned long flags;
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struct pll_clock *pll_clock = to_pll_clock(hw);
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pll = ((rate / parent_rate) / 2) & 0x03;
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spin_lock_irqsave(&clklock, flags);
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val = readb(pll_clock->sckcr);
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val |= 0x08;
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writeb(val, pll_clock->sckcr);
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val = readb(pll_clock->pllcr);
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val &= ~0x03;
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val |= pll;
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writeb(val, pll_clock->pllcr);
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spin_unlock_irqrestore(&clklock, flags);
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return 0;
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}
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static const struct clk_ops pll_ops = {
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.recalc_rate = pll_recalc_rate,
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.round_rate = pll_round_rate,
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.set_rate = pll_set_rate,
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};
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static void __init h8s2678_pll_clk_setup(struct device_node *node)
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{
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unsigned int num_parents;
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const char *clk_name = node->name;
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const char *parent_name;
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struct pll_clock *pll_clock;
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struct clk_init_data init;
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int ret;
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num_parents = of_clk_get_parent_count(node);
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if (!num_parents) {
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pr_err("%s: no parent found\n", clk_name);
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return;
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}
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pll_clock = kzalloc(sizeof(*pll_clock), GFP_KERNEL);
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if (!pll_clock)
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return;
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pll_clock->sckcr = of_iomap(node, 0);
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if (pll_clock->sckcr == NULL) {
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pr_err("%s: failed to map divide register\n", clk_name);
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goto free_clock;
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}
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pll_clock->pllcr = of_iomap(node, 1);
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if (pll_clock->pllcr == NULL) {
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pr_err("%s: failed to map multiply register\n", clk_name);
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goto unmap_sckcr;
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}
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parent_name = of_clk_get_parent_name(node, 0);
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init.name = clk_name;
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init.ops = &pll_ops;
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init.flags = 0;
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init.parent_names = &parent_name;
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init.num_parents = 1;
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pll_clock->hw.init = &init;
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ret = clk_hw_register(NULL, &pll_clock->hw);
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if (ret) {
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pr_err("%s: failed to register %s div clock (%d)\n",
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__func__, clk_name, ret);
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goto unmap_pllcr;
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}
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of_clk_add_hw_provider(node, of_clk_hw_simple_get, &pll_clock->hw);
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return;
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unmap_pllcr:
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iounmap(pll_clock->pllcr);
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unmap_sckcr:
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iounmap(pll_clock->sckcr);
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free_clock:
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kfree(pll_clock);
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}
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CLK_OF_DECLARE(h8s2678_div_clk, "renesas,h8s2678-pll-clock",
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h8s2678_pll_clk_setup);
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