365 lines
11 KiB
C
365 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Marvell Armada AP CPU Clock Controller
|
|
*
|
|
* Copyright (C) 2018 Marvell
|
|
*
|
|
* Omri Itach <omrii@marvell.com>
|
|
* Gregory Clement <gregory.clement@bootlin.com>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "ap-cpu-clk: " fmt
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include "armada_ap_cp_helper.h"
|
|
|
|
#define AP806_CPU_CLUSTER0 0
|
|
#define AP806_CPU_CLUSTER1 1
|
|
#define AP806_CPUS_PER_CLUSTER 2
|
|
#define APN806_CPU1_MASK 0x1
|
|
|
|
#define APN806_CLUSTER_NUM_OFFSET 8
|
|
#define APN806_CLUSTER_NUM_MASK BIT(APN806_CLUSTER_NUM_OFFSET)
|
|
|
|
#define APN806_MAX_DIVIDER 32
|
|
|
|
/**
|
|
* struct cpu_dfs_regs: CPU DFS register mapping
|
|
* @divider_reg: full integer ratio from PLL frequency to CPU clock frequency
|
|
* @force_reg: request to force new ratio regardless of relation to other clocks
|
|
* @ratio_reg: central request to switch ratios
|
|
*/
|
|
struct cpu_dfs_regs {
|
|
unsigned int divider_reg;
|
|
unsigned int force_reg;
|
|
unsigned int ratio_reg;
|
|
unsigned int ratio_state_reg;
|
|
unsigned int divider_mask;
|
|
unsigned int cluster_offset;
|
|
unsigned int force_mask;
|
|
int divider_offset;
|
|
int divider_ratio;
|
|
int ratio_offset;
|
|
int ratio_state_offset;
|
|
int ratio_state_cluster_offset;
|
|
};
|
|
|
|
/* AP806 CPU DFS register mapping*/
|
|
#define AP806_CA72MP2_0_PLL_CR_0_REG_OFFSET 0x278
|
|
#define AP806_CA72MP2_0_PLL_CR_1_REG_OFFSET 0x280
|
|
#define AP806_CA72MP2_0_PLL_CR_2_REG_OFFSET 0x284
|
|
#define AP806_CA72MP2_0_PLL_SR_REG_OFFSET 0xC94
|
|
|
|
#define AP806_CA72MP2_0_PLL_CR_CLUSTER_OFFSET 0x14
|
|
#define AP806_PLL_CR_0_CPU_CLK_DIV_RATIO_OFFSET 0
|
|
#define AP806_PLL_CR_CPU_CLK_DIV_RATIO 0
|
|
#define AP806_PLL_CR_0_CPU_CLK_DIV_RATIO_MASK \
|
|
(0x3f << AP806_PLL_CR_0_CPU_CLK_DIV_RATIO_OFFSET)
|
|
#define AP806_PLL_CR_0_CPU_CLK_RELOAD_FORCE_OFFSET 24
|
|
#define AP806_PLL_CR_0_CPU_CLK_RELOAD_FORCE_MASK \
|
|
(0x1 << AP806_PLL_CR_0_CPU_CLK_RELOAD_FORCE_OFFSET)
|
|
#define AP806_PLL_CR_0_CPU_CLK_RELOAD_RATIO_OFFSET 16
|
|
#define AP806_CA72MP2_0_PLL_RATIO_STABLE_OFFSET 0
|
|
#define AP806_CA72MP2_0_PLL_RATIO_STATE 11
|
|
|
|
#define STATUS_POLL_PERIOD_US 1
|
|
#define STATUS_POLL_TIMEOUT_US 1000000
|
|
|
|
#define to_ap_cpu_clk(_hw) container_of(_hw, struct ap_cpu_clk, hw)
|
|
|
|
static const struct cpu_dfs_regs ap806_dfs_regs = {
|
|
.divider_reg = AP806_CA72MP2_0_PLL_CR_0_REG_OFFSET,
|
|
.force_reg = AP806_CA72MP2_0_PLL_CR_1_REG_OFFSET,
|
|
.ratio_reg = AP806_CA72MP2_0_PLL_CR_2_REG_OFFSET,
|
|
.ratio_state_reg = AP806_CA72MP2_0_PLL_SR_REG_OFFSET,
|
|
.divider_mask = AP806_PLL_CR_0_CPU_CLK_DIV_RATIO_MASK,
|
|
.cluster_offset = AP806_CA72MP2_0_PLL_CR_CLUSTER_OFFSET,
|
|
.force_mask = AP806_PLL_CR_0_CPU_CLK_RELOAD_FORCE_MASK,
|
|
.divider_offset = AP806_PLL_CR_0_CPU_CLK_DIV_RATIO_OFFSET,
|
|
.divider_ratio = AP806_PLL_CR_CPU_CLK_DIV_RATIO,
|
|
.ratio_offset = AP806_PLL_CR_0_CPU_CLK_RELOAD_RATIO_OFFSET,
|
|
.ratio_state_offset = AP806_CA72MP2_0_PLL_RATIO_STABLE_OFFSET,
|
|
.ratio_state_cluster_offset = AP806_CA72MP2_0_PLL_RATIO_STABLE_OFFSET,
|
|
};
|
|
|
|
/* AP807 CPU DFS register mapping */
|
|
#define AP807_DEVICE_GENERAL_CONTROL_10_REG_OFFSET 0x278
|
|
#define AP807_DEVICE_GENERAL_CONTROL_11_REG_OFFSET 0x27c
|
|
#define AP807_DEVICE_GENERAL_STATUS_6_REG_OFFSET 0xc98
|
|
#define AP807_CA72MP2_0_PLL_CR_CLUSTER_OFFSET 0x8
|
|
#define AP807_PLL_CR_0_CPU_CLK_DIV_RATIO_OFFSET 18
|
|
#define AP807_PLL_CR_0_CPU_CLK_DIV_RATIO_MASK \
|
|
(0x3f << AP807_PLL_CR_0_CPU_CLK_DIV_RATIO_OFFSET)
|
|
#define AP807_PLL_CR_1_CPU_CLK_DIV_RATIO_OFFSET 12
|
|
#define AP807_PLL_CR_1_CPU_CLK_DIV_RATIO_MASK \
|
|
(0x3f << AP807_PLL_CR_1_CPU_CLK_DIV_RATIO_OFFSET)
|
|
#define AP807_PLL_CR_CPU_CLK_DIV_RATIO 3
|
|
#define AP807_PLL_CR_0_CPU_CLK_RELOAD_FORCE_OFFSET 0
|
|
#define AP807_PLL_CR_0_CPU_CLK_RELOAD_FORCE_MASK \
|
|
(0x3 << AP807_PLL_CR_0_CPU_CLK_RELOAD_FORCE_OFFSET)
|
|
#define AP807_PLL_CR_0_CPU_CLK_RELOAD_RATIO_OFFSET 6
|
|
#define AP807_CA72MP2_0_PLL_CLKDIV_RATIO_STABLE_OFFSET 20
|
|
#define AP807_CA72MP2_0_PLL_CLKDIV_RATIO_STABLE_CLUSTER_OFFSET 3
|
|
|
|
static const struct cpu_dfs_regs ap807_dfs_regs = {
|
|
.divider_reg = AP807_DEVICE_GENERAL_CONTROL_10_REG_OFFSET,
|
|
.force_reg = AP807_DEVICE_GENERAL_CONTROL_11_REG_OFFSET,
|
|
.ratio_reg = AP807_DEVICE_GENERAL_CONTROL_11_REG_OFFSET,
|
|
.ratio_state_reg = AP807_DEVICE_GENERAL_STATUS_6_REG_OFFSET,
|
|
.divider_mask = AP807_PLL_CR_0_CPU_CLK_DIV_RATIO_MASK,
|
|
.cluster_offset = AP807_CA72MP2_0_PLL_CR_CLUSTER_OFFSET,
|
|
.force_mask = AP807_PLL_CR_0_CPU_CLK_RELOAD_FORCE_MASK,
|
|
.divider_offset = AP807_PLL_CR_0_CPU_CLK_DIV_RATIO_OFFSET,
|
|
.divider_ratio = AP807_PLL_CR_CPU_CLK_DIV_RATIO,
|
|
.ratio_offset = AP807_PLL_CR_0_CPU_CLK_RELOAD_RATIO_OFFSET,
|
|
.ratio_state_offset = AP807_CA72MP2_0_PLL_CLKDIV_RATIO_STABLE_OFFSET,
|
|
.ratio_state_cluster_offset =
|
|
AP807_CA72MP2_0_PLL_CLKDIV_RATIO_STABLE_CLUSTER_OFFSET
|
|
};
|
|
|
|
/*
|
|
* struct ap806_clk: CPU cluster clock controller instance
|
|
* @cluster: Cluster clock controller index
|
|
* @clk_name: Cluster clock controller name
|
|
* @dev : Cluster clock device
|
|
* @hw: HW specific structure of Cluster clock controller
|
|
* @pll_cr_base: CA72MP2 Register base (Device Sample at Reset register)
|
|
*/
|
|
struct ap_cpu_clk {
|
|
unsigned int cluster;
|
|
const char *clk_name;
|
|
struct device *dev;
|
|
struct clk_hw hw;
|
|
struct regmap *pll_cr_base;
|
|
const struct cpu_dfs_regs *pll_regs;
|
|
};
|
|
|
|
static unsigned long ap_cpu_clk_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct ap_cpu_clk *clk = to_ap_cpu_clk(hw);
|
|
unsigned int cpu_clkdiv_reg;
|
|
int cpu_clkdiv_ratio;
|
|
|
|
cpu_clkdiv_reg = clk->pll_regs->divider_reg +
|
|
(clk->cluster * clk->pll_regs->cluster_offset);
|
|
regmap_read(clk->pll_cr_base, cpu_clkdiv_reg, &cpu_clkdiv_ratio);
|
|
cpu_clkdiv_ratio &= clk->pll_regs->divider_mask;
|
|
cpu_clkdiv_ratio >>= clk->pll_regs->divider_offset;
|
|
|
|
return parent_rate / cpu_clkdiv_ratio;
|
|
}
|
|
|
|
static int ap_cpu_clk_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct ap_cpu_clk *clk = to_ap_cpu_clk(hw);
|
|
int ret, reg, divider = parent_rate / rate;
|
|
unsigned int cpu_clkdiv_reg, cpu_force_reg, cpu_ratio_reg, stable_bit;
|
|
|
|
cpu_clkdiv_reg = clk->pll_regs->divider_reg +
|
|
(clk->cluster * clk->pll_regs->cluster_offset);
|
|
cpu_force_reg = clk->pll_regs->force_reg +
|
|
(clk->cluster * clk->pll_regs->cluster_offset);
|
|
cpu_ratio_reg = clk->pll_regs->ratio_reg +
|
|
(clk->cluster * clk->pll_regs->cluster_offset);
|
|
|
|
regmap_read(clk->pll_cr_base, cpu_clkdiv_reg, ®);
|
|
reg &= ~(clk->pll_regs->divider_mask);
|
|
reg |= (divider << clk->pll_regs->divider_offset);
|
|
|
|
/*
|
|
* AP807 CPU divider has two channels with ratio 1:3 and divider_ratio
|
|
* is 1. Otherwise, in the case of the AP806, divider_ratio is 0.
|
|
*/
|
|
if (clk->pll_regs->divider_ratio) {
|
|
reg &= ~(AP807_PLL_CR_1_CPU_CLK_DIV_RATIO_MASK);
|
|
reg |= ((divider * clk->pll_regs->divider_ratio) <<
|
|
AP807_PLL_CR_1_CPU_CLK_DIV_RATIO_OFFSET);
|
|
}
|
|
regmap_write(clk->pll_cr_base, cpu_clkdiv_reg, reg);
|
|
|
|
|
|
regmap_update_bits(clk->pll_cr_base, cpu_force_reg,
|
|
clk->pll_regs->force_mask,
|
|
clk->pll_regs->force_mask);
|
|
|
|
regmap_update_bits(clk->pll_cr_base, cpu_ratio_reg,
|
|
BIT(clk->pll_regs->ratio_offset),
|
|
BIT(clk->pll_regs->ratio_offset));
|
|
|
|
stable_bit = BIT(clk->pll_regs->ratio_state_offset +
|
|
clk->cluster *
|
|
clk->pll_regs->ratio_state_cluster_offset),
|
|
ret = regmap_read_poll_timeout(clk->pll_cr_base,
|
|
clk->pll_regs->ratio_state_reg, reg,
|
|
reg & stable_bit, STATUS_POLL_PERIOD_US,
|
|
STATUS_POLL_TIMEOUT_US);
|
|
if (ret)
|
|
return ret;
|
|
|
|
regmap_update_bits(clk->pll_cr_base, cpu_ratio_reg,
|
|
BIT(clk->pll_regs->ratio_offset), 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long ap_cpu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long *parent_rate)
|
|
{
|
|
int divider = *parent_rate / rate;
|
|
|
|
divider = min(divider, APN806_MAX_DIVIDER);
|
|
|
|
return *parent_rate / divider;
|
|
}
|
|
|
|
static const struct clk_ops ap_cpu_clk_ops = {
|
|
.recalc_rate = ap_cpu_clk_recalc_rate,
|
|
.round_rate = ap_cpu_clk_round_rate,
|
|
.set_rate = ap_cpu_clk_set_rate,
|
|
};
|
|
|
|
static int ap_cpu_clock_probe(struct platform_device *pdev)
|
|
{
|
|
int ret, nclusters = 0, cluster_index = 0;
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *dn, *np = dev->of_node;
|
|
struct clk_hw_onecell_data *ap_cpu_data;
|
|
struct ap_cpu_clk *ap_cpu_clk;
|
|
struct regmap *regmap;
|
|
|
|
regmap = syscon_node_to_regmap(np->parent);
|
|
if (IS_ERR(regmap)) {
|
|
pr_err("cannot get pll_cr_base regmap\n");
|
|
return PTR_ERR(regmap);
|
|
}
|
|
|
|
/*
|
|
* AP806 has 4 cpus and DFS for AP806 is controlled per
|
|
* cluster (2 CPUs per cluster), cpu0 and cpu1 are fixed to
|
|
* cluster0 while cpu2 and cpu3 are fixed to cluster1 whether
|
|
* they are enabled or not. Since cpu0 is the boot cpu, then
|
|
* cluster0 must exist. If cpu2 or cpu3 is enabled, cluster1
|
|
* will exist and the cluster number is 2; otherwise the
|
|
* cluster number is 1.
|
|
*/
|
|
nclusters = 1;
|
|
for_each_of_cpu_node(dn) {
|
|
int cpu, err;
|
|
|
|
err = of_property_read_u32(dn, "reg", &cpu);
|
|
if (WARN_ON(err)) {
|
|
of_node_put(dn);
|
|
return err;
|
|
}
|
|
|
|
/* If cpu2 or cpu3 is enabled */
|
|
if (cpu & APN806_CLUSTER_NUM_MASK) {
|
|
nclusters = 2;
|
|
of_node_put(dn);
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* DFS for AP806 is controlled per cluster (2 CPUs per cluster),
|
|
* so allocate structs per cluster
|
|
*/
|
|
ap_cpu_clk = devm_kcalloc(dev, nclusters, sizeof(*ap_cpu_clk),
|
|
GFP_KERNEL);
|
|
if (!ap_cpu_clk)
|
|
return -ENOMEM;
|
|
|
|
ap_cpu_data = devm_kzalloc(dev, sizeof(*ap_cpu_data) +
|
|
sizeof(struct clk_hw *) * nclusters,
|
|
GFP_KERNEL);
|
|
if (!ap_cpu_data)
|
|
return -ENOMEM;
|
|
|
|
for_each_of_cpu_node(dn) {
|
|
char *clk_name = "cpu-cluster-0";
|
|
struct clk_init_data init;
|
|
const char *parent_name;
|
|
struct clk *parent;
|
|
int cpu, err;
|
|
|
|
err = of_property_read_u32(dn, "reg", &cpu);
|
|
if (WARN_ON(err)) {
|
|
of_node_put(dn);
|
|
return err;
|
|
}
|
|
|
|
cluster_index = cpu & APN806_CLUSTER_NUM_MASK;
|
|
cluster_index >>= APN806_CLUSTER_NUM_OFFSET;
|
|
|
|
/* Initialize once for one cluster */
|
|
if (ap_cpu_data->hws[cluster_index])
|
|
continue;
|
|
|
|
parent = of_clk_get(np, cluster_index);
|
|
if (IS_ERR(parent)) {
|
|
dev_err(dev, "Could not get the clock parent\n");
|
|
of_node_put(dn);
|
|
return -EINVAL;
|
|
}
|
|
parent_name = __clk_get_name(parent);
|
|
clk_name[12] += cluster_index;
|
|
ap_cpu_clk[cluster_index].clk_name =
|
|
ap_cp_unique_name(dev, np->parent, clk_name);
|
|
ap_cpu_clk[cluster_index].cluster = cluster_index;
|
|
ap_cpu_clk[cluster_index].pll_cr_base = regmap;
|
|
ap_cpu_clk[cluster_index].hw.init = &init;
|
|
ap_cpu_clk[cluster_index].dev = dev;
|
|
ap_cpu_clk[cluster_index].pll_regs = of_device_get_match_data(&pdev->dev);
|
|
|
|
init.name = ap_cpu_clk[cluster_index].clk_name;
|
|
init.ops = &ap_cpu_clk_ops;
|
|
init.num_parents = 1;
|
|
init.parent_names = &parent_name;
|
|
|
|
ret = devm_clk_hw_register(dev, &ap_cpu_clk[cluster_index].hw);
|
|
if (ret) {
|
|
of_node_put(dn);
|
|
return ret;
|
|
}
|
|
ap_cpu_data->hws[cluster_index] = &ap_cpu_clk[cluster_index].hw;
|
|
}
|
|
|
|
ap_cpu_data->num = cluster_index + 1;
|
|
|
|
ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, ap_cpu_data);
|
|
if (ret)
|
|
dev_err(dev, "failed to register OF clock provider\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct of_device_id ap_cpu_clock_of_match[] = {
|
|
{
|
|
.compatible = "marvell,ap806-cpu-clock",
|
|
.data = &ap806_dfs_regs,
|
|
},
|
|
{
|
|
.compatible = "marvell,ap807-cpu-clock",
|
|
.data = &ap807_dfs_regs,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct platform_driver ap_cpu_clock_driver = {
|
|
.probe = ap_cpu_clock_probe,
|
|
.driver = {
|
|
.name = "marvell-ap-cpu-clock",
|
|
.of_match_table = ap_cpu_clock_of_match,
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
};
|
|
builtin_platform_driver(ap_cpu_clock_driver);
|