Release 4.7 drivers/clk/mvebu/clk-cpu.c
/*
* Marvell MVEBU CPU clock handling.
*
* Copyright (C) 2012 Marvell
*
* Gregory CLEMENT <gregory.clement@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/of_address.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/delay.h>
#include <linux/mvebu-pmsu.h>
#include <asm/smp_plat.h>
#define SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET 0x0
#define SYS_CTRL_CLK_DIVIDER_CTRL_RESET_ALL 0xff
#define SYS_CTRL_CLK_DIVIDER_CTRL_RESET_SHIFT 8
#define SYS_CTRL_CLK_DIVIDER_CTRL2_OFFSET 0x8
#define SYS_CTRL_CLK_DIVIDER_CTRL2_NBCLK_RATIO_SHIFT 16
#define SYS_CTRL_CLK_DIVIDER_VALUE_OFFSET 0xC
#define SYS_CTRL_CLK_DIVIDER_MASK 0x3F
#define PMU_DFS_RATIO_SHIFT 16
#define PMU_DFS_RATIO_MASK 0x3F
#define MAX_CPU 4
struct cpu_clk {
struct clk_hw hw;
int cpu;
const char *clk_name;
const char *parent_name;
void __iomem *reg_base;
void __iomem *pmu_dfs;
};
static struct clk **clks;
static struct clk_onecell_data clk_data;
#define to_cpu_clk(p) container_of(p, struct cpu_clk, hw)
static unsigned long clk_cpu_recalc_rate(struct clk_hw *hwclk,
unsigned long parent_rate)
{
struct cpu_clk *cpuclk = to_cpu_clk(hwclk);
u32 reg, div;
reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_VALUE_OFFSET);
div = (reg >> (cpuclk->cpu * 8)) & SYS_CTRL_CLK_DIVIDER_MASK;
return parent_rate / div;
}
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| gregory clement | gregory clement | 63 | 100.00% | 1 | 100.00% |
| Total | 63 | 100.00% | 1 | 100.00% |
static long clk_cpu_round_rate(struct clk_hw *hwclk, unsigned long rate,
unsigned long *parent_rate)
{
/* Valid ratio are 1:1, 1:2 and 1:3 */
u32 div;
div = *parent_rate / rate;
if (div == 0)
div = 1;
else if (div > 3)
div = 3;
return *parent_rate / div;
}
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| gregory clement | gregory clement | 58 | 100.00% | 1 | 100.00% |
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static int clk_cpu_off_set_rate(struct clk_hw *hwclk, unsigned long rate,
unsigned long parent_rate)
{
struct cpu_clk *cpuclk = to_cpu_clk(hwclk);
u32 reg, div;
u32 reload_mask;
div = parent_rate / rate;
reg = (readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_VALUE_OFFSET)
& (~(SYS_CTRL_CLK_DIVIDER_MASK << (cpuclk->cpu * 8))))
| (div << (cpuclk->cpu * 8));
writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_VALUE_OFFSET);
/* Set clock divider reload smooth bit mask */
reload_mask = 1 << (20 + cpuclk->cpu);
reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET)
| reload_mask;
writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
/* Now trigger the clock update */
reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET)
| 1 << 24;
writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
/* Wait for clocks to settle down then clear reload request */
udelay(1000);
reg &= ~(reload_mask | 1 << 24);
writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
udelay(1000);
return 0;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| gregory clement | gregory clement | 193 | 99.48% | 1 | 50.00% |
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| Total | 194 | 100.00% | 2 | 100.00% |
static int clk_cpu_on_set_rate(struct clk_hw *hwclk, unsigned long rate,
unsigned long parent_rate)
{
u32 reg;
unsigned long fabric_div, target_div, cur_rate;
struct cpu_clk *cpuclk = to_cpu_clk(hwclk);
/*
* PMU DFS registers are not mapped, Device Tree does not
* describes them. We cannot change the frequency dynamically.
*/
if (!cpuclk->pmu_dfs)
return -ENODEV;
cur_rate = clk_hw_get_rate(hwclk);
reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL2_OFFSET);
fabric_div = (reg >> SYS_CTRL_CLK_DIVIDER_CTRL2_NBCLK_RATIO_SHIFT) &
SYS_CTRL_CLK_DIVIDER_MASK;
/* Frequency is going up */
if (rate == 2 * cur_rate)
target_div = fabric_div / 2;
/* Frequency is going down */
else
target_div = fabric_div;
if (target_div == 0)
target_div = 1;
reg = readl(cpuclk->pmu_dfs);
reg &= ~(PMU_DFS_RATIO_MASK << PMU_DFS_RATIO_SHIFT);
reg |= (target_div << PMU_DFS_RATIO_SHIFT);
writel(reg, cpuclk->pmu_dfs);
reg = readl(cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
reg |= (SYS_CTRL_CLK_DIVIDER_CTRL_RESET_ALL <<
SYS_CTRL_CLK_DIVIDER_CTRL_RESET_SHIFT);
writel(reg, cpuclk->reg_base + SYS_CTRL_CLK_DIVIDER_CTRL_OFFSET);
return mvebu_pmsu_dfs_request(cpuclk->cpu);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| thomas petazzoni | thomas petazzoni | 183 | 99.46% | 1 | 50.00% |
| stephen boyd | stephen boyd | 1 | 0.54% | 1 | 50.00% |
| Total | 184 | 100.00% | 2 | 100.00% |
static int clk_cpu_set_rate(struct clk_hw *hwclk, unsigned long rate,
unsigned long parent_rate)
{
if (__clk_is_enabled(hwclk->clk))
return clk_cpu_on_set_rate(hwclk, rate, parent_rate);
else
return clk_cpu_off_set_rate(hwclk, rate, parent_rate);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| thomas petazzoni | thomas petazzoni | 49 | 100.00% | 1 | 100.00% |
| Total | 49 | 100.00% | 1 | 100.00% |
static const struct clk_ops cpu_ops = {
.recalc_rate = clk_cpu_recalc_rate,
.round_rate = clk_cpu_round_rate,
.set_rate = clk_cpu_set_rate,
};
static void __init of_cpu_clk_setup(struct device_node *node)
{
struct cpu_clk *cpuclk;
void __iomem *clock_complex_base = of_iomap(node, 0);
void __iomem *pmu_dfs_base = of_iomap(node, 1);
int ncpus = 0;
struct device_node *dn;
if (clock_complex_base == NULL) {
pr_err("%s: clock-complex base register not set\n",
__func__);
return;
}
if (pmu_dfs_base == NULL)
pr_warn("%s: pmu-dfs base register not set, dynamic frequency scaling not available\n",
__func__);
for_each_node_by_type(dn, "cpu")
ncpus++;
cpuclk = kzalloc(ncpus * sizeof(*cpuclk), GFP_KERNEL);
if (WARN_ON(!cpuclk))
goto cpuclk_out;
clks = kzalloc(ncpus * sizeof(*clks), GFP_KERNEL);
if (WARN_ON(!clks))
goto clks_out;
for_each_node_by_type(dn, "cpu") {
struct clk_init_data init;
struct clk *clk;
char *clk_name = kzalloc(5, GFP_KERNEL);
int cpu, err;
if (WARN_ON(!clk_name))
goto bail_out;
err = of_property_read_u32(dn, "reg", &cpu);
if (WARN_ON(err))
goto bail_out;
sprintf(clk_name, "cpu%d", cpu);
cpuclk[cpu].parent_name = of_clk_get_parent_name(node, 0);
cpuclk[cpu].clk_name = clk_name;
cpuclk[cpu].cpu = cpu;
cpuclk[cpu].reg_base = clock_complex_base;
if (pmu_dfs_base)
cpuclk[cpu].pmu_dfs = pmu_dfs_base + 4 * cpu;
cpuclk[cpu].hw.init = &init;
init.name = cpuclk[cpu].clk_name;
init.ops = &cpu_ops;
init.flags = 0;
init.parent_names = &cpuclk[cpu].parent_name;
init.num_parents = 1;
clk = clk_register(NULL, &cpuclk[cpu].hw);
if (WARN_ON(IS_ERR(clk)))
goto bail_out;
clks[cpu] = clk;
}
clk_data.clk_num = MAX_CPU;
clk_data.clks = clks;
of_clk_add_provider(node, of_clk_src_onecell_get, &clk_data);
return;
bail_out:
kfree(clks);
while(ncpus--)
kfree(cpuclk[ncpus].clk_name);
clks_out:
kfree(cpuclk);
cpuclk_out:
iounmap(clock_complex_base);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| gregory clement | gregory clement | 339 | 80.33% | 1 | 16.67% |
| thomas petazzoni | thomas petazzoni | 42 | 9.95% | 1 | 16.67% |
| cong ding | cong ding | 26 | 6.16% | 1 | 16.67% |
| jisheng zhang | jisheng zhang | 10 | 2.37% | 1 | 16.67% |
| stephen boyd | stephen boyd | 4 | 0.95% | 1 | 16.67% |
| sachin kamat | sachin kamat | 1 | 0.24% | 1 | 16.67% |
| Total | 422 | 100.00% | 6 | 100.00% |
CLK_OF_DECLARE(armada_xp_cpu_clock, "marvell,armada-xp-cpu-clock",
of_cpu_clk_setup);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| gregory clement | gregory clement | 763 | 67.88% | 1 | 11.11% |
| thomas petazzoni | thomas petazzoni | 310 | 27.58% | 1 | 11.11% |
| cong ding | cong ding | 26 | 2.31% | 1 | 11.11% |
| jisheng zhang | jisheng zhang | 10 | 0.89% | 1 | 11.11% |
| stephen boyd | stephen boyd | 9 | 0.80% | 3 | 33.33% |
| jean-francois moine | jean-francois moine | 5 | 0.44% | 1 | 11.11% |
| sachin kamat | sachin kamat | 1 | 0.09% | 1 | 11.11% |
| Total | 1124 | 100.00% | 9 | 100.00% |
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