Add clock driver code for the Microchip PolarFire SoC. This driver handles reset and clock control of the Microchip PolarFire SoC device.
Signed-off-by: Padmarao Begari padmarao.begari@microchip.com Reviewed-by: Anup Patel anup.patel@wdc.com Tested-by: Bin Meng bin.meng@windriver.com --- drivers/clk/Kconfig | 1 + drivers/clk/Makefile | 1 + drivers/clk/microchip/Kconfig | 5 + drivers/clk/microchip/Makefile | 1 + drivers/clk/microchip/mpfs_clk.c | 123 ++++++++++++ drivers/clk/microchip/mpfs_clk.h | 44 +++++ drivers/clk/microchip/mpfs_clk_cfg.c | 152 ++++++++++++++ drivers/clk/microchip/mpfs_clk_periph.c | 187 ++++++++++++++++++ .../dt-bindings/clock/microchip-mpfs-clock.h | 45 +++++ 9 files changed, 559 insertions(+) create mode 100644 drivers/clk/microchip/Kconfig create mode 100644 drivers/clk/microchip/Makefile create mode 100644 drivers/clk/microchip/mpfs_clk.c create mode 100644 drivers/clk/microchip/mpfs_clk.h create mode 100644 drivers/clk/microchip/mpfs_clk_cfg.c create mode 100644 drivers/clk/microchip/mpfs_clk_periph.c create mode 100644 include/dt-bindings/clock/microchip-mpfs-clock.h
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 4dfbad7986..1161fe7b5a 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -173,6 +173,7 @@ source "drivers/clk/exynos/Kconfig" source "drivers/clk/imx/Kconfig" source "drivers/clk/kendryte/Kconfig" source "drivers/clk/meson/Kconfig" +source "drivers/clk/microchip/Kconfig" source "drivers/clk/mvebu/Kconfig" source "drivers/clk/owl/Kconfig" source "drivers/clk/renesas/Kconfig" diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index d1e295ac7c..dbf28c4e81 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_$(SPL_TPL_)CLK_INTEL) += intel/ obj-$(CONFIG_CLK_HSDK) += clk-hsdk-cgu.o obj-$(CONFIG_CLK_K210) += kendryte/ obj-$(CONFIG_CLK_MPC83XX) += mpc83xx_clk.o +obj-$(CONFIG_CLK_MPFS) += microchip/ obj-$(CONFIG_CLK_OCTEON) += clk_octeon.o obj-$(CONFIG_CLK_OWL) += owl/ obj-$(CONFIG_CLK_RENESAS) += renesas/ diff --git a/drivers/clk/microchip/Kconfig b/drivers/clk/microchip/Kconfig new file mode 100644 index 0000000000..b70241559d --- /dev/null +++ b/drivers/clk/microchip/Kconfig @@ -0,0 +1,5 @@ +config CLK_MPFS + bool "Clock support for Microchip PolarFire SoC" + depends on CLK && CLK_CCF + help + This enables support clock driver for Microchip PolarFire SoC platform. diff --git a/drivers/clk/microchip/Makefile b/drivers/clk/microchip/Makefile new file mode 100644 index 0000000000..904b345d75 --- /dev/null +++ b/drivers/clk/microchip/Makefile @@ -0,0 +1 @@ +obj-y += mpfs_clk.o mpfs_clk_cfg.o mpfs_clk_periph.o diff --git a/drivers/clk/microchip/mpfs_clk.c b/drivers/clk/microchip/mpfs_clk.c new file mode 100644 index 0000000000..722c79b7c0 --- /dev/null +++ b/drivers/clk/microchip/mpfs_clk.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2020 Microchip Technology Inc. + * Padmarao Begari padmarao.begari@microchip.com + */ +#include <common.h> +#include <clk.h> +#include <clk-uclass.h> +#include <dm.h> +#include <log.h> +#include <dm/device.h> +#include <dm/devres.h> +#include <dm/uclass.h> +#include <linux/err.h> + +#include "mpfs_clk.h" + +/* All methods are delegated to CCF clocks */ + +static ulong mpfs_clk_get_rate(struct clk *clk) +{ + struct clk *c; + int err = clk_get_by_id(clk->id, &c); + + if (err) + return err; + return clk_get_rate(c); +} + +static ulong mpfs_clk_set_rate(struct clk *clk, unsigned long rate) +{ + struct clk *c; + int err = clk_get_by_id(clk->id, &c); + + if (err) + return err; + return clk_set_rate(c, rate); +} + +static int mpfs_clk_set_parent(struct clk *clk, struct clk *parent) +{ + struct clk *c, *p; + int err = clk_get_by_id(clk->id, &c); + + if (err) + return err; + + err = clk_get_by_id(parent->id, &p); + if (err) + return err; + + return clk_set_parent(c, p); +} + +static int mpfs_clk_endisable(struct clk *clk, bool enable) +{ + struct clk *c; + int err = clk_get_by_id(clk->id, &c); + + if (err) + return err; + return enable ? clk_enable(c) : clk_disable(c); +} + +static int mpfs_clk_enable(struct clk *clk) +{ + return mpfs_clk_endisable(clk, true); +} + +static int mpfs_clk_disable(struct clk *clk) +{ + return mpfs_clk_endisable(clk, false); +} + +static int mpfs_clk_probe(struct udevice *dev) +{ + int ret; + void __iomem *base; + u32 clk_rate; + const char *parent_clk_name; + struct clk *clk = dev_get_priv(dev); + + base = dev_read_addr_ptr(dev); + if (!base) + return -EINVAL; + + ret = clk_get_by_index(dev, 0, clk); + if (ret) + return ret; + + dev_read_u32(clk->dev, "clock-frequency", &clk_rate); + parent_clk_name = clk->dev->name; + + ret = mpfs_clk_register_cfgs(base, clk_rate, parent_clk_name); + if (ret) + return ret; + + ret = mpfs_clk_register_periphs(base, clk_rate, "clk_ahb"); + + return ret; +} + +static const struct clk_ops mpfs_clk_ops = { + .set_rate = mpfs_clk_set_rate, + .get_rate = mpfs_clk_get_rate, + .set_parent = mpfs_clk_set_parent, + .enable = mpfs_clk_enable, + .disable = mpfs_clk_disable, +}; + +static const struct udevice_id mpfs_of_match[] = { + { .compatible = "microchip,mpfs-clkcfg" }, + { } +}; + +U_BOOT_DRIVER(mpfs_clk) = { + .name = "mpfs_clk", + .id = UCLASS_CLK, + .of_match = mpfs_of_match, + .ops = &mpfs_clk_ops, + .probe = mpfs_clk_probe, + .priv_auto = sizeof(struct clk), +}; diff --git a/drivers/clk/microchip/mpfs_clk.h b/drivers/clk/microchip/mpfs_clk.h new file mode 100644 index 0000000000..8e3fc55ae3 --- /dev/null +++ b/drivers/clk/microchip/mpfs_clk.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (C) 2020 Microchip Technology Inc. + * Padmarao Begari padmarao.begari@microchip.com + */ +#ifndef __MICROCHIP_MPFS_CLK_H +#define __MICROCHIP_MPFS_CLK_H + +#include <linux/clk-provider.h> +/** + * mpfs_clk_register_cfgs() - register configuration clocks + * + * @base: base address of the mpfs system register. + * @clk_rate: the mpfs pll clock rate. + * @parent_name: a pointer to parent clock name. + * @return zero on success, or a negative error code. + */ +int mpfs_clk_register_cfgs(void __iomem *base, u32 clk_rate, + const char *parent_name); +/** + * mpfs_clk_register_periphs() - register peripheral clocks + * + * @base: base address of the mpfs system register. + * @clk_rate: the mpfs pll clock rate. + * @parent_name: a pointer to parent clock name. + * @return zero on success, or a negative error code. + */ +int mpfs_clk_register_periphs(void __iomem *base, u32 clk_rate, + const char *parent_name); +/** + * divider_get_val() - get the clock divider value + * + * @rate: requested clock rate. + * @parent_rate: parent clock rate. + * @table: a pointer to clock divider table. + * @width: width of the divider bit field. + * @flags: common clock framework flags. + * @return divider value on success, or a negative error code. + */ +int divider_get_val(unsigned long rate, unsigned long parent_rate, + const struct clk_div_table *table, + u8 width, unsigned long flags); + +#endif /* __MICROCHIP_MPFS_CLK_H */ diff --git a/drivers/clk/microchip/mpfs_clk_cfg.c b/drivers/clk/microchip/mpfs_clk_cfg.c new file mode 100644 index 0000000000..fefddd1413 --- /dev/null +++ b/drivers/clk/microchip/mpfs_clk_cfg.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2020 Microchip Technology Inc. + * Padmarao Begari padmarao.begari@microchip.com + */ +#include <common.h> +#include <clk.h> +#include <clk-uclass.h> +#include <asm/io.h> +#include <dm/device.h> +#include <dm/devres.h> +#include <dm/uclass.h> +#include <dt-bindings/clock/microchip-mpfs-clock.h> +#include <linux/err.h> + +#include "mpfs_clk.h" + +#define MPFS_CFG_CLOCK "mpfs_cfg_clock" + +#define REG_CLOCK_CONFIG_CR 0x08 + +/* CPU and AXI clock divisors */ +static const struct clk_div_table mpfs_div_cpu_axi_table[] = { + { 0, 1 }, { 1, 2 }, { 2, 4 }, { 3, 8 }, + { 0, 0 } +}; + +/* AHB clock divisors */ +static const struct clk_div_table mpfs_div_ahb_table[] = { + { 1, 2 }, { 2, 4}, { 3, 8 }, + { 0, 0 } +}; + +/** + * struct mpfs_cfg_clock - per instance of configuration clock + * @id: index of a configuration clock + * @name: name of a configuration clock + * @shift: shift to the divider bit field of a configuration clock + * @width: width of the divider bit field of a configation clock + * @table: clock divider table instance + * @flags: common clock framework flags + */ +struct mpfs_cfg_clock { + unsigned int id; + const char *name; + u8 shift; + u8 width; + const struct clk_div_table *table; + unsigned long flags; +}; + +/** + * struct mpfs_cfg_hw_clock - hardware configuration clock (cpu, axi, ahb) + * @cfg: configuration clock instance + * @sys_base: base address of the mpfs system register + * @prate: the pll clock rate + * @hw: clock instance + */ +struct mpfs_cfg_hw_clock { + struct mpfs_cfg_clock cfg; + void __iomem *sys_base; + u32 prate; + struct clk hw; +}; + +#define to_mpfs_cfg_clk(_hw) container_of(_hw, struct mpfs_cfg_hw_clock, hw) + +static ulong mpfs_cfg_clk_recalc_rate(struct clk *hw) +{ + struct mpfs_cfg_hw_clock *cfg_hw = to_mpfs_cfg_clk(hw); + struct mpfs_cfg_clock *cfg = &cfg_hw->cfg; + void __iomem *base_addr = cfg_hw->sys_base; + unsigned long rate; + u32 val; + + val = readl(base_addr + REG_CLOCK_CONFIG_CR) >> cfg->shift; + val &= clk_div_mask(cfg->width); + rate = cfg_hw->prate / (1u << val); + hw->rate = rate; + + return rate; +} + +static ulong mpfs_cfg_clk_set_rate(struct clk *hw, ulong rate) +{ + struct mpfs_cfg_hw_clock *cfg_hw = to_mpfs_cfg_clk(hw); + struct mpfs_cfg_clock *cfg = &cfg_hw->cfg; + void __iomem *base_addr = cfg_hw->sys_base; + u32 val; + int divider_setting; + + divider_setting = divider_get_val(rate, cfg_hw->prate, cfg->table, cfg->width, cfg->flags); + + if (divider_setting < 0) + return divider_setting; + + val = readl(base_addr + REG_CLOCK_CONFIG_CR); + val &= ~(clk_div_mask(cfg->width) << cfg_hw->cfg.shift); + val |= divider_setting << cfg->shift; + writel(val, base_addr + REG_CLOCK_CONFIG_CR); + + return clk_get_rate(hw); +} + +#define CLK_CFG(_id, _name, _shift, _width, _table, _flags) { \ + .cfg.id = _id, \ + .cfg.name = _name, \ + .cfg.shift = _shift, \ + .cfg.width = _width, \ + .cfg.table = _table, \ + .cfg.flags = _flags, \ + } + +static struct mpfs_cfg_hw_clock mpfs_cfg_clks[] = { + CLK_CFG(CLK_CPU, "clk_cpu", 0, 2, mpfs_div_cpu_axi_table, 0), + CLK_CFG(CLK_AXI, "clk_axi", 2, 2, mpfs_div_cpu_axi_table, 0), + CLK_CFG(CLK_AHB, "clk_ahb", 4, 2, mpfs_div_ahb_table, 0), +}; + +int mpfs_clk_register_cfgs(void __iomem *base, u32 clk_rate, + const char *parent_name) +{ + int ret; + int i, id, num_clks; + const char *name; + struct clk *hw; + + num_clks = ARRAY_SIZE(mpfs_cfg_clks); + for (i = 0; i < num_clks; i++) { + hw = &mpfs_cfg_clks[i].hw; + mpfs_cfg_clks[i].sys_base = base; + mpfs_cfg_clks[i].prate = clk_rate; + name = mpfs_cfg_clks[i].cfg.name; + ret = clk_register(hw, MPFS_CFG_CLOCK, name, parent_name); + if (ret) + ERR_PTR(ret); + id = mpfs_cfg_clks[i].cfg.id; + clk_dm(id, hw); + } + return 0; +} + +const struct clk_ops mpfs_cfg_clk_ops = { + .set_rate = mpfs_cfg_clk_set_rate, + .get_rate = mpfs_cfg_clk_recalc_rate, +}; + +U_BOOT_DRIVER(mpfs_cfg_clock) = { + .name = MPFS_CFG_CLOCK, + .id = UCLASS_CLK, + .ops = &mpfs_cfg_clk_ops, +}; diff --git a/drivers/clk/microchip/mpfs_clk_periph.c b/drivers/clk/microchip/mpfs_clk_periph.c new file mode 100644 index 0000000000..61d90eb4a8 --- /dev/null +++ b/drivers/clk/microchip/mpfs_clk_periph.c @@ -0,0 +1,187 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2020 Microchip Technology Inc. + * Padmarao Begari padmarao.begari@microchip.com + */ +#include <common.h> +#include <clk.h> +#include <clk-uclass.h> +#include <asm/io.h> +#include <dm/device.h> +#include <dm/devres.h> +#include <dm/uclass.h> +#include <dt-bindings/clock/microchip-mpfs-clock.h> +#include <linux/err.h> + +#include "mpfs_clk.h" + +#define MPFS_PERIPH_CLOCK "mpfs_periph_clock" + +#define REG_CLOCK_CONFIG_CR 0x08 +#define REG_SUBBLK_CLOCK_CR 0x84 +#define REG_SUBBLK_RESET_CR 0x88 + +#define CFG_CPU_SHIFT 0x0 +#define CFG_AXI_SHIFT 0x2 +#define CFG_AHB_SHIFT 0x4 +#define CFG_WIDTH 0x2 + +/** + * struct mpfs_periph_clock - per instance of peripheral clock + * @id: index of a peripheral clock + * @name: name of a peripheral clock + * @shift: shift to a peripheral clock bit field + * @flags: common clock framework flags + */ +struct mpfs_periph_clock { + unsigned int id; + const char *name; + u8 shift; + unsigned long flags; +}; + +/** + * struct mpfs_periph_hw_clock - hardware peripheral clock + * @periph: peripheral clock instance + * @sys_base: base address of the mpfs system register + * @prate: the pll clock rate + * @hw: clock instance + */ +struct mpfs_periph_hw_clock { + struct mpfs_periph_clock periph; + void __iomem *sys_base; + u32 prate; + struct clk hw; +}; + +#define to_mpfs_periph_clk(_hw) container_of(_hw, struct mpfs_periph_hw_clock, hw) + +static int mpfs_periph_clk_enable(struct clk *hw) +{ + struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw); + struct mpfs_periph_clock *periph = &periph_hw->periph; + void __iomem *base_addr = periph_hw->sys_base; + u32 reg, val; + + if (periph->flags != CLK_IS_CRITICAL) { + reg = readl(base_addr + REG_SUBBLK_RESET_CR); + val = reg & ~(1u << periph->shift); + writel(val, base_addr + REG_SUBBLK_RESET_CR); + + reg = readl(base_addr + REG_SUBBLK_CLOCK_CR); + val = reg | (1u << periph->shift); + writel(val, base_addr + REG_SUBBLK_CLOCK_CR); + } + + return 0; +} + +static int mpfs_periph_clk_disable(struct clk *hw) +{ + struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw); + struct mpfs_periph_clock *periph = &periph_hw->periph; + void __iomem *base_addr = periph_hw->sys_base; + u32 reg, val; + + if (periph->flags != CLK_IS_CRITICAL) { + reg = readl(base_addr + REG_SUBBLK_RESET_CR); + val = reg | (1u << periph->shift); + writel(val, base_addr + REG_SUBBLK_RESET_CR); + + reg = readl(base_addr + REG_SUBBLK_CLOCK_CR); + val = reg & ~(1u << periph->shift); + writel(val, base_addr + REG_SUBBLK_CLOCK_CR); + } + + return 0; +} + +static ulong mpfs_periph_clk_recalc_rate(struct clk *hw) +{ + struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw); + void __iomem *base_addr = periph_hw->sys_base; + unsigned long rate; + u32 val; + + val = readl(base_addr + REG_CLOCK_CONFIG_CR) >> CFG_AHB_SHIFT; + val &= clk_div_mask(CFG_WIDTH); + rate = periph_hw->prate / (1u << val); + hw->rate = rate; + + return rate; +} + +#define CLK_PERIPH(_id, _name, _shift, _flags) { \ + .periph.id = _id, \ + .periph.name = _name, \ + .periph.shift = _shift, \ + .periph.flags = _flags, \ + } + +static struct mpfs_periph_hw_clock mpfs_periph_clks[] = { + CLK_PERIPH(CLK_ENVM, "clk_periph_envm", 0, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_MAC0, "clk_periph_mac0", 1, 0), + CLK_PERIPH(CLK_MAC1, "clk_periph_mac1", 2, 0), + CLK_PERIPH(CLK_MMC, "clk_periph_mmc", 3, 0), + CLK_PERIPH(CLK_TIMER, "clk_periph_timer", 4, 0), + CLK_PERIPH(CLK_MMUART0, "clk_periph_mmuart0", 5, 0), + CLK_PERIPH(CLK_MMUART1, "clk_periph_mmuart1", 6, 0), + CLK_PERIPH(CLK_MMUART2, "clk_periph_mmuart2", 7, 0), + CLK_PERIPH(CLK_MMUART3, "clk_periph_mmuart3", 8, 0), + CLK_PERIPH(CLK_MMUART4, "clk_periph_mmuart4", 9, 0), + CLK_PERIPH(CLK_SPI0, "clk_periph_spi0", 10, 0), + CLK_PERIPH(CLK_SPI1, "clk_periph_spi1", 11, 0), + CLK_PERIPH(CLK_I2C0, "clk_periph_i2c0", 12, 0), + CLK_PERIPH(CLK_I2C1, "clk_periph_i2c1", 13, 0), + CLK_PERIPH(CLK_CAN0, "clk_periph_can0", 14, 0), + CLK_PERIPH(CLK_CAN1, "clk_periph_can1", 15, 0), + CLK_PERIPH(CLK_USB, "clk_periph_usb", 16, 0), + CLK_PERIPH(CLK_RTC, "clk_periph_rtc", 18, 0), + CLK_PERIPH(CLK_QSPI, "clk_periph_qspi", 19, 0), + CLK_PERIPH(CLK_GPIO0, "clk_periph_gpio0", 20, 0), + CLK_PERIPH(CLK_GPIO1, "clk_periph_gpio1", 21, 0), + CLK_PERIPH(CLK_GPIO2, "clk_periph_gpio2", 22, 0), + CLK_PERIPH(CLK_DDRC, "clk_periph_ddrc", 23, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_FIC0, "clk_periph_fic0", 24, 0), + CLK_PERIPH(CLK_FIC1, "clk_periph_fic1", 25, 0), + CLK_PERIPH(CLK_FIC2, "clk_periph_fic2", 26, 0), + CLK_PERIPH(CLK_FIC3, "clk_periph_fic3", 27, 0), + CLK_PERIPH(CLK_ATHENA, "clk_periph_athena", 28, 0), + CLK_PERIPH(CLK_CFM, "clk_periph_cfm", 29, 0), +}; + +int mpfs_clk_register_periphs(void __iomem *base, u32 clk_rate, + const char *parent_name) +{ + int ret; + int i, id, num_clks; + const char *name; + struct clk *hw; + + num_clks = ARRAY_SIZE(mpfs_periph_clks); + for (i = 0; i < num_clks; i++) { + hw = &mpfs_periph_clks[i].hw; + mpfs_periph_clks[i].sys_base = base; + mpfs_periph_clks[i].prate = clk_rate; + name = mpfs_periph_clks[i].periph.name; + ret = clk_register(hw, MPFS_PERIPH_CLOCK, name, parent_name); + if (ret) + ERR_PTR(ret); + id = mpfs_periph_clks[i].periph.id; + clk_dm(id, hw); + } + + return 0; +} + +const struct clk_ops mpfs_periph_clk_ops = { + .enable = mpfs_periph_clk_enable, + .disable = mpfs_periph_clk_disable, + .get_rate = mpfs_periph_clk_recalc_rate, +}; + +U_BOOT_DRIVER(mpfs_periph_clock) = { + .name = MPFS_PERIPH_CLOCK, + .id = UCLASS_CLK, + .ops = &mpfs_periph_clk_ops, +}; diff --git a/include/dt-bindings/clock/microchip-mpfs-clock.h b/include/dt-bindings/clock/microchip-mpfs-clock.h new file mode 100644 index 0000000000..55fe64693f --- /dev/null +++ b/include/dt-bindings/clock/microchip-mpfs-clock.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */ +/* + * Copyright (C) 2020 Microchip Technology Inc. + * Padmarao Begari padmarao.begari@microchip.com + */ + +#ifndef _DT_BINDINGS_CLK_MICROCHIP_MPFS_H_ +#define _DT_BINDINGS_CLK_MICROCHIP_MPFS_H_ + +#define CLK_CPU 0 +#define CLK_AXI 1 +#define CLK_AHB 2 + +#define CLK_ENVM 3 +#define CLK_MAC0 4 +#define CLK_MAC1 5 +#define CLK_MMC 6 +#define CLK_TIMER 7 +#define CLK_MMUART0 8 +#define CLK_MMUART1 9 +#define CLK_MMUART2 10 +#define CLK_MMUART3 11 +#define CLK_MMUART4 12 +#define CLK_SPI0 13 +#define CLK_SPI1 14 +#define CLK_I2C0 15 +#define CLK_I2C1 16 +#define CLK_CAN0 17 +#define CLK_CAN1 18 +#define CLK_USB 19 +#define CLK_RESERVED 20 +#define CLK_RTC 21 +#define CLK_QSPI 22 +#define CLK_GPIO0 23 +#define CLK_GPIO1 24 +#define CLK_GPIO2 25 +#define CLK_DDRC 26 +#define CLK_FIC0 27 +#define CLK_FIC1 28 +#define CLK_FIC2 29 +#define CLK_FIC3 30 +#define CLK_ATHENA 31 +#define CLK_CFM 32 + +#endif /* _DT_BINDINGS_CLK_MICROCHIP_MPFS_H_ */