mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-08-29 04:34:45 -04:00
bf4afc53b7
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
248 lines
6.4 KiB
C
248 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Marvell MVEBU CPU clock handling.
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*
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* Copyright (C) 2012 Marvell
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*
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* Gregory CLEMENT <gregory.clement@free-electrons.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/of_address.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/delay.h>
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#include <linux/mvebu-pmsu.h>
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#include <asm/smp_plat.h>
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#define SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET 0x0
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#define SYS_CTRL_CLK_DIVIDER_CTRL_RESET_ALL 0xff
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#define SYS_CTRL_CLK_DIVIDER_CTRL_RESET_SHIFT 8
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#define SYS_CTRL_CLK_DIVIDER_CTRL2_OFFSET 0x8
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#define SYS_CTRL_CLK_DIVIDER_CTRL2_NBCLK_RATIO_SHIFT 16
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#define SYS_CTRL_CLK_DIVIDER_VALUE_OFFSET 0xC
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#define SYS_CTRL_CLK_DIVIDER_MASK 0x3F
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#define PMU_DFS_RATIO_SHIFT 16
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#define PMU_DFS_RATIO_MASK 0x3F
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#define MAX_CPU 4
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struct cpu_clk {
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struct clk_hw hw;
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int cpu;
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const char *clk_name;
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const char *parent_name;
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void __iomem *reg_base;
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void __iomem *pmu_dfs;
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};
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static struct clk **clks;
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static struct clk_onecell_data clk_data;
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#define to_cpu_clk(p) container_of(p, struct cpu_clk, hw)
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static unsigned long clk_cpu_recalc_rate(struct clk_hw *hwclk,
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unsigned long parent_rate)
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{
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struct cpu_clk *cpuclk = to_cpu_clk(hwclk);
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u32 reg, div;
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reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_VALUE_OFFSET);
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div = (reg >> (cpuclk->cpu * 8)) & SYS_CTRL_CLK_DIVIDER_MASK;
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return parent_rate / div;
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}
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static int clk_cpu_determine_rate(struct clk_hw *hw,
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struct clk_rate_request *req)
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{
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/* Valid ratio are 1:1, 1:2 and 1:3 */
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u32 div;
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div = req->best_parent_rate / req->rate;
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if (div == 0)
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div = 1;
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else if (div > 3)
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div = 3;
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req->rate = req->best_parent_rate / div;
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return 0;
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}
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static int clk_cpu_off_set_rate(struct clk_hw *hwclk, unsigned long rate,
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unsigned long parent_rate)
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{
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struct cpu_clk *cpuclk = to_cpu_clk(hwclk);
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u32 reg, div;
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u32 reload_mask;
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div = parent_rate / rate;
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reg = (readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_VALUE_OFFSET)
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& (~(SYS_CTRL_CLK_DIVIDER_MASK << (cpuclk->cpu * 8))))
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| (div << (cpuclk->cpu * 8));
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writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_VALUE_OFFSET);
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/* Set clock divider reload smooth bit mask */
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reload_mask = 1 << (20 + cpuclk->cpu);
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reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET)
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| reload_mask;
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writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
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/* Now trigger the clock update */
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reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET)
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| 1 << 24;
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writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
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/* Wait for clocks to settle down then clear reload request */
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udelay(1000);
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reg &= ~(reload_mask | 1 << 24);
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writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
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udelay(1000);
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return 0;
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}
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static int clk_cpu_on_set_rate(struct clk_hw *hwclk, unsigned long rate,
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unsigned long parent_rate)
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{
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u32 reg;
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unsigned long fabric_div, target_div, cur_rate;
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struct cpu_clk *cpuclk = to_cpu_clk(hwclk);
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/*
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* PMU DFS registers are not mapped, Device Tree does not
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* describes them. We cannot change the frequency dynamically.
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*/
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if (!cpuclk->pmu_dfs)
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return -ENODEV;
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cur_rate = clk_hw_get_rate(hwclk);
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reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL2_OFFSET);
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fabric_div = (reg >> SYS_CTRL_CLK_DIVIDER_CTRL2_NBCLK_RATIO_SHIFT) &
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SYS_CTRL_CLK_DIVIDER_MASK;
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/* Frequency is going up */
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if (rate == 2 * cur_rate)
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target_div = fabric_div / 2;
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/* Frequency is going down */
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else
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target_div = fabric_div;
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if (target_div == 0)
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target_div = 1;
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reg = readl(cpuclk->pmu_dfs);
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reg &= ~(PMU_DFS_RATIO_MASK << PMU_DFS_RATIO_SHIFT);
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reg |= (target_div << PMU_DFS_RATIO_SHIFT);
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writel(reg, cpuclk->pmu_dfs);
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reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
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reg |= (SYS_CTRL_CLK_DIVIDER_CTRL_RESET_ALL <<
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SYS_CTRL_CLK_DIVIDER_CTRL_RESET_SHIFT);
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writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
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return mvebu_pmsu_dfs_request(cpuclk->cpu);
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}
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static int clk_cpu_set_rate(struct clk_hw *hwclk, unsigned long rate,
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unsigned long parent_rate)
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{
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if (__clk_is_enabled(hwclk->clk))
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return clk_cpu_on_set_rate(hwclk, rate, parent_rate);
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else
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return clk_cpu_off_set_rate(hwclk, rate, parent_rate);
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}
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static const struct clk_ops cpu_ops = {
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.recalc_rate = clk_cpu_recalc_rate,
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.determine_rate = clk_cpu_determine_rate,
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.set_rate = clk_cpu_set_rate,
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};
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static void __init of_cpu_clk_setup(struct device_node *node)
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{
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struct cpu_clk *cpuclk;
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void __iomem *clock_complex_base = of_iomap(node, 0);
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void __iomem *pmu_dfs_base = of_iomap(node, 1);
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int ncpus = num_possible_cpus();
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int cpu;
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if (clock_complex_base == NULL) {
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pr_err("%s: clock-complex base register not set\n",
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__func__);
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return;
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}
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if (pmu_dfs_base == NULL)
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pr_warn("%s: pmu-dfs base register not set, dynamic frequency scaling not available\n",
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__func__);
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cpuclk = kzalloc_objs(*cpuclk, ncpus);
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if (WARN_ON(!cpuclk))
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goto cpuclk_out;
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clks = kzalloc_objs(*clks, ncpus);
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if (WARN_ON(!clks))
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goto clks_out;
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for_each_possible_cpu(cpu) {
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struct clk_init_data init;
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struct clk *clk;
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char *clk_name = kzalloc(5, GFP_KERNEL);
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if (WARN_ON(!clk_name))
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goto bail_out;
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sprintf(clk_name, "cpu%d", cpu);
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cpuclk[cpu].parent_name = of_clk_get_parent_name(node, 0);
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cpuclk[cpu].clk_name = clk_name;
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cpuclk[cpu].cpu = cpu;
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cpuclk[cpu].reg_base = clock_complex_base;
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if (pmu_dfs_base)
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cpuclk[cpu].pmu_dfs = pmu_dfs_base + 4 * cpu;
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cpuclk[cpu].hw.init = &init;
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init.name = cpuclk[cpu].clk_name;
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init.ops = &cpu_ops;
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init.flags = 0;
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init.parent_names = &cpuclk[cpu].parent_name;
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init.num_parents = 1;
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clk = clk_register(NULL, &cpuclk[cpu].hw);
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if (WARN_ON(IS_ERR(clk)))
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goto bail_out;
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clks[cpu] = clk;
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}
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clk_data.clk_num = MAX_CPU;
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clk_data.clks = clks;
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of_clk_add_provider(node, of_clk_src_onecell_get, &clk_data);
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return;
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bail_out:
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kfree(clks);
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while(ncpus--)
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kfree(cpuclk[ncpus].clk_name);
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clks_out:
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kfree(cpuclk);
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cpuclk_out:
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iounmap(clock_complex_base);
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}
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CLK_OF_DECLARE(armada_xp_cpu_clock, "marvell,armada-xp-cpu-clock",
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of_cpu_clk_setup);
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static void __init of_mv98dx3236_cpu_clk_setup(struct device_node *node)
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{
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of_clk_add_provider(node, of_clk_src_simple_get, NULL);
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}
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CLK_OF_DECLARE(mv98dx3236_cpu_clock, "marvell,mv98dx3236-cpu-clock",
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of_mv98dx3236_cpu_clk_setup);
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