diff options
| -rw-r--r-- | Documentation/devicetree/bindings/clock/microchip,lan966x-gck.yaml | 60 | ||||
| -rw-r--r-- | drivers/clk/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/clk/Makefile | 1 | ||||
| -rw-r--r-- | drivers/clk/clk-gate.c | 35 | ||||
| -rw-r--r-- | drivers/clk/clk-lan966x.c | 293 | ||||
| -rw-r--r-- | include/dt-bindings/clock/microchip,lan966x.h | 34 | ||||
| -rw-r--r-- | include/linux/clk-provider.h | 23 |
7 files changed, 453 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/clock/microchip,lan966x-gck.yaml b/Documentation/devicetree/bindings/clock/microchip,lan966x-gck.yaml new file mode 100644 index 000000000000..df2bec188706 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/microchip,lan966x-gck.yaml @@ -0,0 +1,60 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/microchip,lan966x-gck.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Microchip LAN966X Generic Clock Controller + +maintainers: + - Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com> + +description: | + The LAN966X Generic clock controller contains 3 PLLs - cpu_clk, + ddr_clk and sys_clk. This clock controller generates and supplies + clock to various peripherals within the SoC. + +properties: + compatible: + const: microchip,lan966x-gck + + reg: + minItems: 1 + items: + - description: Generic clock registers + - description: Optional gate clock registers + + clocks: + items: + - description: CPU clock source + - description: DDR clock source + - description: System clock source + + clock-names: + items: + - const: cpu + - const: ddr + - const: sys + + '#clock-cells': + const: 1 + +required: + - compatible + - reg + - clocks + - clock-names + - '#clock-cells' + +additionalProperties: false + +examples: + - | + clks: clock-controller@e00c00a8 { + compatible = "microchip,lan966x-gck"; + #clock-cells = <1>; + clocks = <&cpu_clk>, <&ddr_clk>, <&sys_clk>; + clock-names = "cpu", "ddr", "sys"; + reg = <0xe00c00a8 0x38>; + }; +... diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index c5b3dc97396a..1b992a554ff8 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -221,6 +221,13 @@ config COMMON_CLK_GEMINI This driver supports the SoC clocks on the Cortina Systems Gemini platform, also known as SL3516 or CS3516. +config COMMON_CLK_LAN966X + bool "Generic Clock Controller driver for LAN966X SoC" + help + This driver provides support for Generic Clock Controller(GCK) on + LAN966X SoC. GCK generates and supplies clock to various peripherals + within the SoC. + config COMMON_CLK_ASPEED bool "Clock driver for Aspeed BMC SoCs" depends on ARCH_ASPEED || COMPILE_TEST diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index e42312121e51..d8565ef01b34 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o obj-$(CONFIG_CLK_HSDK) += clk-hsdk-pll.o obj-$(CONFIG_COMMON_CLK_K210) += clk-k210.o obj-$(CONFIG_LMK04832) += clk-lmk04832.o +obj-$(CONFIG_COMMON_CLK_LAN966X) += clk-lan966x.o obj-$(CONFIG_COMMON_CLK_LOCHNAGAR) += clk-lochnagar.o obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o obj-$(CONFIG_COMMON_CLK_MAX9485) += clk-max9485.o diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c index 070dc47e95a1..64283807600b 100644 --- a/drivers/clk/clk-gate.c +++ b/drivers/clk/clk-gate.c @@ -7,6 +7,7 @@ */ #include <linux/clk-provider.h> +#include <linux/device.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/io.h> @@ -222,3 +223,37 @@ void clk_hw_unregister_gate(struct clk_hw *hw) kfree(gate); } EXPORT_SYMBOL_GPL(clk_hw_unregister_gate); + +static void devm_clk_hw_release_gate(struct device *dev, void *res) +{ + clk_hw_unregister_gate(*(struct clk_hw **)res); +} + +struct clk_hw *__devm_clk_hw_register_gate(struct device *dev, + struct device_node *np, const char *name, + const char *parent_name, const struct clk_hw *parent_hw, + const struct clk_parent_data *parent_data, + unsigned long flags, + void __iomem *reg, u8 bit_idx, + u8 clk_gate_flags, spinlock_t *lock) +{ + struct clk_hw **ptr, *hw; + + ptr = devres_alloc(devm_clk_hw_release_gate, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + hw = __clk_hw_register_gate(dev, np, name, parent_name, parent_hw, + parent_data, flags, reg, bit_idx, + clk_gate_flags, lock); + + if (!IS_ERR(hw)) { + *ptr = hw; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return hw; +} +EXPORT_SYMBOL_GPL(__devm_clk_hw_register_gate); diff --git a/drivers/clk/clk-lan966x.c b/drivers/clk/clk-lan966x.c new file mode 100644 index 000000000000..d1535ac13e89 --- /dev/null +++ b/drivers/clk/clk-lan966x.c @@ -0,0 +1,293 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Microchip LAN966x SoC Clock driver. + * + * Copyright (C) 2021 Microchip Technology, Inc. and its subsidiaries + * + * Author: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com> + */ + +#include <linux/bitfield.h> +#include <linux/clk-provider.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <dt-bindings/clock/microchip,lan966x.h> + +#define GCK_ENA BIT(0) +#define GCK_SRC_SEL GENMASK(9, 8) +#define GCK_PRESCALER GENMASK(23, 16) + +#define DIV_MAX 255 + +static const char *clk_names[N_CLOCKS] = { + "qspi0", "qspi1", "qspi2", "sdmmc0", + "pi", "mcan0", "mcan1", "flexcom0", + "flexcom1", "flexcom2", "flexcom3", + "flexcom4", "timer1", "usb_refclk", +}; + +struct lan966x_gck { + struct clk_hw hw; + void __iomem *reg; +}; +#define to_lan966x_gck(hw) container_of(hw, struct lan966x_gck, hw) + +static const struct clk_parent_data lan966x_gck_pdata[] = { + { .fw_name = "cpu", }, + { .fw_name = "ddr", }, + { .fw_name = "sys", }, +}; + +static struct clk_init_data init = { + .parent_data = lan966x_gck_pdata, + .num_parents = ARRAY_SIZE(lan966x_gck_pdata), +}; + +struct clk_gate_soc_desc { + const char *name; + int bit_idx; +}; + +static const struct clk_gate_soc_desc clk_gate_desc[] = { + { "uhphs", 11 }, + { "udphs", 10 }, + { "mcramc", 9 }, + { "hmatrix", 8 }, + { } +}; + +static DEFINE_SPINLOCK(clk_gate_lock); +static void __iomem *base; + +static int lan966x_gck_enable(struct clk_hw *hw) +{ + struct lan966x_gck *gck = to_lan966x_gck(hw); + u32 val = readl(gck->reg); + + val |= GCK_ENA; + writel(val, gck->reg); + + return 0; +} + +static void lan966x_gck_disable(struct clk_hw *hw) +{ + struct lan966x_gck *gck = to_lan966x_gck(hw); + u32 val = readl(gck->reg); + + val &= ~GCK_ENA; + writel(val, gck->reg); +} + +static int lan966x_gck_set_rate(struct clk_hw *hw, + unsigned long rate, + unsigned long parent_rate) +{ + struct lan966x_gck *gck = to_lan966x_gck(hw); + u32 div, val = readl(gck->reg); + + if (rate == 0 || parent_rate == 0) + return -EINVAL; + + /* Set Prescalar */ + div = parent_rate / rate; + val &= ~GCK_PRESCALER; + val |= FIELD_PREP(GCK_PRESCALER, (div - 1)); + writel(val, gck->reg); + + return 0; +} + +static long lan966x_gck_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + unsigned int div; + + if (rate == 0 || *parent_rate == 0) + return -EINVAL; + + if (rate >= *parent_rate) + return *parent_rate; + + div = DIV_ROUND_CLOSEST(*parent_rate, rate); + + return *parent_rate / div; +} + +static unsigned long lan966x_gck_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct lan966x_gck *gck = to_lan966x_gck(hw); + u32 div, val = readl(gck->reg); + + div = FIELD_GET(GCK_PRESCALER, val); + + return parent_rate / (div + 1); +} + +static int lan966x_gck_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_hw *parent; + int i; + + for (i = 0; i < clk_hw_get_num_parents(hw); ++i) { + parent = clk_hw_get_parent_by_index(hw, i); + if (!parent) + continue; + + /* Allowed prescaler divider range is 0-255 */ + if (clk_hw_get_rate(parent) / req->rate <= DIV_MAX) { + req->best_parent_hw = parent; + req->best_parent_rate = clk_hw_get_rate(parent); + + return 0; + } + } + + return -EINVAL; +} + +static u8 lan966x_gck_get_parent(struct clk_hw *hw) +{ + struct lan966x_gck *gck = to_lan966x_gck(hw); + u32 val = readl(gck->reg); + + return FIELD_GET(GCK_SRC_SEL, val); +} + +static int lan966x_gck_set_parent(struct clk_hw *hw, u8 index) +{ + struct lan966x_gck *gck = to_lan966x_gck(hw); + u32 val = readl(gck->reg); + + val &= ~GCK_SRC_SEL; + val |= FIELD_PREP(GCK_SRC_SEL, index); + writel(val, gck->reg); + + return 0; +} + +static const struct clk_ops lan966x_gck_ops = { + .enable = lan966x_gck_enable, + .disable = lan966x_gck_disable, + .set_rate = lan966x_gck_set_rate, + .round_rate = lan966x_gck_round_rate, + .recalc_rate = lan966x_gck_recalc_rate, + .determine_rate = lan966x_gck_determine_rate, + .set_parent = lan966x_gck_set_parent, + .get_parent = lan966x_gck_get_parent, +}; + +static struct clk_hw *lan966x_gck_clk_register(struct device *dev, int i) +{ + struct lan966x_gck *priv; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return ERR_PTR(-ENOMEM); + + priv->reg = base + (i * 4); + priv->hw.init = &init; + ret = devm_clk_hw_register(dev, &priv->hw); + if (ret) + return ERR_PTR(ret); + + return &priv->hw; +}; + +static int lan966x_gate_clk_register(struct device *dev, + struct clk_hw_onecell_data *hw_data, + void __iomem *gate_base) +{ + int i; + + for (i = GCK_GATE_UHPHS; i < N_CLOCKS; ++i) { + int idx = i - GCK_GATE_UHPHS; + + hw_data->hws[i] = + devm_clk_hw_register_gate(dev, clk_gate_desc[idx].name, + "lan966x", 0, base, + clk_gate_desc[idx].bit_idx, + 0, &clk_gate_lock); + + if (IS_ERR(hw_data->hws[i])) + return dev_err_probe(dev, PTR_ERR(hw_data->hws[i]), + "failed to register %s clock\n", + clk_gate_desc[idx].name); + } + + return 0; +} + +static int lan966x_clk_probe(struct platform_device *pdev) +{ + struct clk_hw_onecell_data *hw_data; + struct device *dev = &pdev->dev; + void __iomem *gate_base; + struct resource *res; + int i, ret; + + hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, N_CLOCKS), + GFP_KERNEL); + if (!hw_data) + return -ENOMEM; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + init.ops = &lan966x_gck_ops; + + hw_data->num = GCK_GATE_UHPHS; + + for (i = 0; i < GCK_GATE_UHPHS; i++) { + init.name = clk_names[i]; + hw_data->hws[i] = lan966x_gck_clk_register(dev, i); + if (IS_ERR(hw_data->hws[i])) { + dev_err(dev, "failed to register %s clock\n", + init.name); + return PTR_ERR(hw_data->hws[i]); + } + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (res) { + gate_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(gate_base)) + return PTR_ERR(gate_base); + + hw_data->num = N_CLOCKS; + + ret = lan966x_gate_clk_register(dev, hw_data, gate_base); + if (ret) + return ret; + } + + return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_data); +} + +static const struct of_device_id lan966x_clk_dt_ids[] = { + { .compatible = "microchip,lan966x-gck", }, + { } +}; +MODULE_DEVICE_TABLE(of, lan966x_clk_dt_ids); + +static struct platform_driver lan966x_clk_driver = { + .probe = lan966x_clk_probe, + .driver = { + .name = "lan966x-clk", + .of_match_table = lan966x_clk_dt_ids, + }, +}; +builtin_platform_driver(lan966x_clk_driver); + +MODULE_AUTHOR("Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>"); +MODULE_DESCRIPTION("LAN966X clock driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/dt-bindings/clock/microchip,lan966x.h b/include/dt-bindings/clock/microchip,lan966x.h new file mode 100644 index 000000000000..6f9d43d76d5a --- /dev/null +++ b/include/dt-bindings/clock/microchip,lan966x.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */ +/* + * Copyright (c) 2021 Microchip Inc. + * + * Author: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com> + */ + +#ifndef _DT_BINDINGS_CLK_LAN966X_H +#define _DT_BINDINGS_CLK_LAN966X_H + +#define GCK_ID_QSPI0 0 +#define GCK_ID_QSPI1 1 +#define GCK_ID_QSPI2 2 +#define GCK_ID_SDMMC0 3 +#define GCK_ID_PI 4 +#define GCK_ID_MCAN0 5 +#define GCK_ID_MCAN1 6 +#define GCK_ID_FLEXCOM0 7 +#define GCK_ID_FLEXCOM1 8 +#define GCK_ID_FLEXCOM2 9 +#define GCK_ID_FLEXCOM3 10 +#define GCK_ID_FLEXCOM4 11 +#define GCK_ID_TIMER 12 +#define GCK_ID_USB_REFCLK 13 + +/* Gate clocks */ +#define GCK_GATE_UHPHS 14 +#define GCK_GATE_UDPHS 15 +#define GCK_GATE_MCRAMC 16 +#define GCK_GATE_HMATRIX 17 + +#define N_CLOCKS 18 + +#endif diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index f59c875271a0..2faa6f7aa8a8 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -490,6 +490,13 @@ struct clk_hw *__clk_hw_register_gate(struct device *dev, unsigned long flags, void __iomem *reg, u8 bit_idx, u8 clk_gate_flags, spinlock_t *lock); +struct clk_hw *__devm_clk_hw_register_gate(struct device *dev, + struct device_node *np, const char *name, + const char *parent_name, const struct clk_hw *parent_hw, + const struct clk_parent_data *parent_data, + unsigned long flags, + void __iomem *reg, u8 bit_idx, + u8 clk_gate_flags, spinlock_t *lock); struct clk *clk_register_gate(struct device *dev, const char *name, const char *parent_name, unsigned long flags, void __iomem *reg, u8 bit_idx, @@ -544,6 +551,22 @@ struct clk *clk_register_gate(struct device *dev, const char *name, __clk_hw_register_gate((dev), NULL, (name), NULL, NULL, (parent_data), \ (flags), (reg), (bit_idx), \ (clk_gate_flags), (lock)) +/** + * devm_clk_hw_register_gate - register a gate clock with the clock framework + * @dev: device that is registering this clock + * @name: name of this clock + * @parent_name: name of this clock's parent + * @flags: framework-specific flags for this clock + * @reg: register address to control gating of this clock + * @bit_idx: which bit in the register controls gating of this clock + * @clk_gate_flags: gate-specific flags for this clock + * @lock: shared register lock for this clock + */ +#define devm_clk_hw_register_gate(dev, name, parent_name, flags, reg, bit_idx,\ + clk_gate_flags, lock) \ + __devm_clk_hw_register_gate((dev), NULL, (name), (parent_name), NULL, \ + NULL, (flags), (reg), (bit_idx), \ + (clk_gate_flags), (lock)) void clk_unregister_gate(struct clk *clk); void clk_hw_unregister_gate(struct clk_hw *hw); int clk_gate_is_enabled(struct clk_hw *hw); |