diff options
Diffstat (limited to 'drivers/clk/mvebu/ap-cpu-clk.c')
| -rw-r--r-- | drivers/clk/mvebu/ap-cpu-clk.c | 364 |
1 files changed, 364 insertions, 0 deletions
diff --git a/drivers/clk/mvebu/ap-cpu-clk.c b/drivers/clk/mvebu/ap-cpu-clk.c new file mode 100644 index 000000000..71bdd7c3f --- /dev/null +++ b/drivers/clk/mvebu/ap-cpu-clk.c @@ -0,0 +1,364 @@ +// 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, struct_size(ap_cpu_data, hws, + 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); |