From: Beniamino Galvani b.galvani@gmail.com
Introduce a basic clock driver for Amlogic Meson SoCs which supports enabling/disabling clock gates and getting their frequency.
Signed-off-by: Beniamino Galvani b.galvani@gmail.com Signed-off-by: Neil Armstrong narmstrong@baylibre.com --- arch/arm/include/asm/arch-meson/clock.h | 117 ++++++++++ arch/arm/mach-meson/Kconfig | 2 + drivers/clk/Makefile | 1 + drivers/clk/clk_meson.c | 393 ++++++++++++++++++++++++++++++++ drivers/clk/clk_meson.h | 47 ++++ 5 files changed, 560 insertions(+) create mode 100644 arch/arm/include/asm/arch-meson/clock.h create mode 100644 drivers/clk/clk_meson.c create mode 100644 drivers/clk/clk_meson.h
diff --git a/arch/arm/include/asm/arch-meson/clock.h b/arch/arm/include/asm/arch-meson/clock.h new file mode 100644 index 0000000..c0ff00f --- /dev/null +++ b/arch/arm/include/asm/arch-meson/clock.h @@ -0,0 +1,117 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright 2016 - AmLogic, Inc. + * Copyright 2018 - Beniamino Galvani b.galvani@gmail.com + */ +#ifndef _ARCH_MESON_CLOCK_H_ +#define _ARCH_MESON_CLOCK_H_ + +/* + * Clock controller register offsets + * + * Register offsets from the data sheet are listed in comment blocks below. + * Those offsets must be multiplied by 4 before adding them to the base address + * to get the right value + */ +#define SCR 0x2C /* 0x0b offset in data sheet */ +#define TIMEOUT_VALUE 0x3c /* 0x0f offset in data sheet */ + +#define HHI_GP0_PLL_CNTL 0x40 /* 0x10 offset in data sheet */ +#define HHI_GP0_PLL_CNTL2 0x44 /* 0x11 offset in data sheet */ +#define HHI_GP0_PLL_CNTL3 0x48 /* 0x12 offset in data sheet */ +#define HHI_GP0_PLL_CNTL4 0x4c /* 0x13 offset in data sheet */ +#define HHI_GP0_PLL_CNTL5 0x50 /* 0x14 offset in data sheet */ +#define HHI_GP0_PLL_CNTL1 0x58 /* 0x16 offset in data sheet */ + +#define HHI_XTAL_DIVN_CNTL 0xbc /* 0x2f offset in data sheet */ +#define HHI_TIMER90K 0xec /* 0x3b offset in data sheet */ + +#define HHI_MEM_PD_REG0 0x100 /* 0x40 offset in data sheet */ +#define HHI_MEM_PD_REG1 0x104 /* 0x41 offset in data sheet */ +#define HHI_VPU_MEM_PD_REG1 0x108 /* 0x42 offset in data sheet */ +#define HHI_VIID_CLK_DIV 0x128 /* 0x4a offset in data sheet */ +#define HHI_VIID_CLK_CNTL 0x12c /* 0x4b offset in data sheet */ + +#define HHI_GCLK_MPEG0 0x140 /* 0x50 offset in data sheet */ +#define HHI_GCLK_MPEG1 0x144 /* 0x51 offset in data sheet */ +#define HHI_GCLK_MPEG2 0x148 /* 0x52 offset in data sheet */ +#define HHI_GCLK_OTHER 0x150 /* 0x54 offset in data sheet */ +#define HHI_GCLK_AO 0x154 /* 0x55 offset in data sheet */ +#define HHI_SYS_OSCIN_CNTL 0x158 /* 0x56 offset in data sheet */ +#define HHI_SYS_CPU_CLK_CNTL1 0x15c /* 0x57 offset in data sheet */ +#define HHI_SYS_CPU_RESET_CNTL 0x160 /* 0x58 offset in data sheet */ +#define HHI_VID_CLK_DIV 0x164 /* 0x59 offset in data sheet */ + +#define HHI_MPEG_CLK_CNTL 0x174 /* 0x5d offset in data sheet */ +#define HHI_AUD_CLK_CNTL 0x178 /* 0x5e offset in data sheet */ +#define HHI_VID_CLK_CNTL 0x17c /* 0x5f offset in data sheet */ +#define HHI_AUD_CLK_CNTL2 0x190 /* 0x64 offset in data sheet */ +#define HHI_VID_CLK_CNTL2 0x194 /* 0x65 offset in data sheet */ +#define HHI_SYS_CPU_CLK_CNTL0 0x19c /* 0x67 offset in data sheet */ +#define HHI_VID_PLL_CLK_DIV 0x1a0 /* 0x68 offset in data sheet */ +#define HHI_AUD_CLK_CNTL3 0x1a4 /* 0x69 offset in data sheet */ +#define HHI_MALI_CLK_CNTL 0x1b0 /* 0x6c offset in data sheet */ +#define HHI_VPU_CLK_CNTL 0x1bC /* 0x6f offset in data sheet */ + +#define HHI_HDMI_CLK_CNTL 0x1CC /* 0x73 offset in data sheet */ +#define HHI_VDEC_CLK_CNTL 0x1E0 /* 0x78 offset in data sheet */ +#define HHI_VDEC2_CLK_CNTL 0x1E4 /* 0x79 offset in data sheet */ +#define HHI_VDEC3_CLK_CNTL 0x1E8 /* 0x7a offset in data sheet */ +#define HHI_VDEC4_CLK_CNTL 0x1EC /* 0x7b offset in data sheet */ +#define HHI_HDCP22_CLK_CNTL 0x1F0 /* 0x7c offset in data sheet */ +#define HHI_VAPBCLK_CNTL 0x1F4 /* 0x7d offset in data sheet */ + +#define HHI_VPU_CLKB_CNTL 0x20C /* 0x83 offset in data sheet */ +#define HHI_USB_CLK_CNTL 0x220 /* 0x88 offset in data sheet */ +#define HHI_32K_CLK_CNTL 0x224 /* 0x89 offset in data sheet */ +#define HHI_GEN_CLK_CNTL 0x228 /* 0x8a offset in data sheet */ +#define HHI_GEN_CLK_CNTL 0x228 /* 0x8a offset in data sheet */ + +#define HHI_PCM_CLK_CNTL 0x258 /* 0x96 offset in data sheet */ +#define HHI_NAND_CLK_CNTL 0x25C /* 0x97 offset in data sheet */ +#define HHI_SD_EMMC_CLK_CNTL 0x264 /* 0x99 offset in data sheet */ + +#define HHI_MPLL_CNTL 0x280 /* 0xa0 offset in data sheet */ +#define HHI_MPLL_CNTL2 0x284 /* 0xa1 offset in data sheet */ +#define HHI_MPLL_CNTL3 0x288 /* 0xa2 offset in data sheet */ +#define HHI_MPLL_CNTL4 0x28C /* 0xa3 offset in data sheet */ +#define HHI_MPLL_CNTL5 0x290 /* 0xa4 offset in data sheet */ +#define HHI_MPLL_CNTL6 0x294 /* 0xa5 offset in data sheet */ +#define HHI_MPLL_CNTL7 0x298 /* 0xa6 offset in data sheet */ +#define HHI_MPLL_CNTL8 0x29C /* 0xa7 offset in data sheet */ +#define HHI_MPLL_CNTL9 0x2A0 /* 0xa8 offset in data sheet */ +#define HHI_MPLL_CNTL10 0x2A4 /* 0xa9 offset in data sheet */ + +#define HHI_MPLL3_CNTL0 0x2E0 /* 0xb8 offset in data sheet */ +#define HHI_MPLL3_CNTL1 0x2E4 /* 0xb9 offset in data sheet */ +#define HHI_VDAC_CNTL0 0x2F4 /* 0xbd offset in data sheet */ +#define HHI_VDAC_CNTL1 0x2F8 /* 0xbe offset in data sheet */ + +#define HHI_SYS_PLL_CNTL 0x300 /* 0xc0 offset in data sheet */ +#define HHI_SYS_PLL_CNTL2 0x304 /* 0xc1 offset in data sheet */ +#define HHI_SYS_PLL_CNTL3 0x308 /* 0xc2 offset in data sheet */ +#define HHI_SYS_PLL_CNTL4 0x30c /* 0xc3 offset in data sheet */ +#define HHI_SYS_PLL_CNTL5 0x310 /* 0xc4 offset in data sheet */ +#define HHI_DPLL_TOP_I 0x318 /* 0xc6 offset in data sheet */ +#define HHI_DPLL_TOP2_I 0x31C /* 0xc7 offset in data sheet */ +#define HHI_HDMI_PLL_CNTL 0x320 /* 0xc8 offset in data sheet */ +#define HHI_HDMI_PLL_CNTL2 0x324 /* 0xc9 offset in data sheet */ +#define HHI_HDMI_PLL_CNTL3 0x328 /* 0xca offset in data sheet */ +#define HHI_HDMI_PLL_CNTL4 0x32C /* 0xcb offset in data sheet */ +#define HHI_HDMI_PLL_CNTL5 0x330 /* 0xcc offset in data sheet */ +#define HHI_HDMI_PLL_CNTL6 0x334 /* 0xcd offset in data sheet */ +#define HHI_HDMI_PLL_CNTL_I 0x338 /* 0xce offset in data sheet */ +#define HHI_HDMI_PLL_CNTL7 0x33C /* 0xcf offset in data sheet */ + +#define HHI_HDMI_PHY_CNTL0 0x3A0 /* 0xe8 offset in data sheet */ +#define HHI_HDMI_PHY_CNTL1 0x3A4 /* 0xe9 offset in data sheet */ +#define HHI_HDMI_PHY_CNTL2 0x3A8 /* 0xea offset in data sheet */ +#define HHI_HDMI_PHY_CNTL3 0x3AC /* 0xeb offset in data sheet */ + +#define HHI_VID_LOCK_CLK_CNTL 0x3C8 /* 0xf2 offset in data sheet */ +#define HHI_BT656_CLK_CNTL 0x3D4 /* 0xf5 offset in data sheet */ +#define HHI_SAR_CLK_CNTL 0x3D8 /* 0xf6 offset in data sheet */ + +ulong meson_measure_clk_rate(unsigned int clk); + +#endif diff --git a/arch/arm/mach-meson/Kconfig b/arch/arm/mach-meson/Kconfig index 0350787..9a06ccc 100644 --- a/arch/arm/mach-meson/Kconfig +++ b/arch/arm/mach-meson/Kconfig @@ -3,6 +3,7 @@ if ARCH_MESON config MESON_GXBB bool "Support Meson GXBaby" select ARM64 + select CLK select DM select DM_SERIAL help @@ -12,6 +13,7 @@ config MESON_GXBB config MESON_GXL bool "Support Meson GXL" select ARM64 + select CLK select DM select DM_SERIAL help diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 58139b1..426c67d 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_$(SPL_TPL_)CLK) += clk-uclass.o clk_fixed_rate.o
obj-y += tegra/ obj-$(CONFIG_ARCH_ASPEED) += aspeed/ +obj-$(CONFIG_ARCH_MESON) += clk_meson.o obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ obj-$(CONFIG_CLK_AT91) += at91/ obj-$(CONFIG_CLK_MVEBU) += mvebu/ diff --git a/drivers/clk/clk_meson.c b/drivers/clk/clk_meson.c new file mode 100644 index 0000000..3850128 --- /dev/null +++ b/drivers/clk/clk_meson.c @@ -0,0 +1,393 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2018 - Beniamino Galvani b.galvani@gmail.com + * (C) Copyright 2018 - BayLibre, SAS + * Author: Neil Armstrong narmstrong@baylibre.com + */ + +#include <common.h> +#include <asm/arch/clock.h> +#include <asm/io.h> +#include <clk-uclass.h> +#include <div64.h> +#include <dm.h> +#include <dt-bindings/clock/gxbb-clkc.h> +#include "clk_meson.h" + +#define XTAL_RATE 24000000 + +struct meson_clk { + void __iomem *addr; +}; + +static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id); + +struct meson_gate gates[] = { + /* Everything Else (EE) domain gates */ + MESON_GATE(CLKID_DDR, HHI_GCLK_MPEG0, 0), + MESON_GATE(CLKID_DOS, HHI_GCLK_MPEG0, 1), + MESON_GATE(CLKID_ISA, HHI_GCLK_MPEG0, 5), + MESON_GATE(CLKID_PL301, HHI_GCLK_MPEG0, 6), + MESON_GATE(CLKID_PERIPHS, HHI_GCLK_MPEG0, 7), + MESON_GATE(CLKID_SPICC, HHI_GCLK_MPEG0, 8), + MESON_GATE(CLKID_I2C, HHI_GCLK_MPEG0, 9), + MESON_GATE(CLKID_SAR_ADC, HHI_GCLK_MPEG0, 10), + MESON_GATE(CLKID_SMART_CARD, HHI_GCLK_MPEG0, 11), + MESON_GATE(CLKID_RNG0, HHI_GCLK_MPEG0, 12), + MESON_GATE(CLKID_UART0, HHI_GCLK_MPEG0, 13), + MESON_GATE(CLKID_SDHC, HHI_GCLK_MPEG0, 14), + MESON_GATE(CLKID_STREAM, HHI_GCLK_MPEG0, 15), + MESON_GATE(CLKID_ASYNC_FIFO, HHI_GCLK_MPEG0, 16), + MESON_GATE(CLKID_SDIO, HHI_GCLK_MPEG0, 17), + MESON_GATE(CLKID_ABUF, HHI_GCLK_MPEG0, 18), + MESON_GATE(CLKID_HIU_IFACE, HHI_GCLK_MPEG0, 19), + MESON_GATE(CLKID_ASSIST_MISC, HHI_GCLK_MPEG0, 23), + MESON_GATE(CLKID_SD_EMMC_A, HHI_GCLK_MPEG0, 24), + MESON_GATE(CLKID_SD_EMMC_B, HHI_GCLK_MPEG0, 25), + MESON_GATE(CLKID_SD_EMMC_C, HHI_GCLK_MPEG0, 26), + MESON_GATE(CLKID_SPI, HHI_GCLK_MPEG0, 30), + + MESON_GATE(CLKID_I2S_SPDIF, HHI_GCLK_MPEG1, 2), + MESON_GATE(CLKID_ETH, HHI_GCLK_MPEG1, 3), + MESON_GATE(CLKID_DEMUX, HHI_GCLK_MPEG1, 4), + MESON_GATE(CLKID_AIU_GLUE, HHI_GCLK_MPEG1, 6), + MESON_GATE(CLKID_IEC958, HHI_GCLK_MPEG1, 7), + MESON_GATE(CLKID_I2S_OUT, HHI_GCLK_MPEG1, 8), + MESON_GATE(CLKID_AMCLK, HHI_GCLK_MPEG1, 9), + MESON_GATE(CLKID_AIFIFO2, HHI_GCLK_MPEG1, 10), + MESON_GATE(CLKID_MIXER, HHI_GCLK_MPEG1, 11), + MESON_GATE(CLKID_MIXER_IFACE, HHI_GCLK_MPEG1, 12), + MESON_GATE(CLKID_ADC, HHI_GCLK_MPEG1, 13), + MESON_GATE(CLKID_BLKMV, HHI_GCLK_MPEG1, 14), + MESON_GATE(CLKID_AIU, HHI_GCLK_MPEG1, 15), + MESON_GATE(CLKID_UART1, HHI_GCLK_MPEG1, 16), + MESON_GATE(CLKID_G2D, HHI_GCLK_MPEG1, 20), + MESON_GATE(CLKID_USB0, HHI_GCLK_MPEG1, 21), + MESON_GATE(CLKID_USB1, HHI_GCLK_MPEG1, 22), + MESON_GATE(CLKID_RESET, HHI_GCLK_MPEG1, 23), + MESON_GATE(CLKID_NAND, HHI_GCLK_MPEG1, 24), + MESON_GATE(CLKID_DOS_PARSER, HHI_GCLK_MPEG1, 25), + MESON_GATE(CLKID_USB, HHI_GCLK_MPEG1, 26), + MESON_GATE(CLKID_VDIN1, HHI_GCLK_MPEG1, 28), + MESON_GATE(CLKID_AHB_ARB0, HHI_GCLK_MPEG1, 29), + MESON_GATE(CLKID_EFUSE, HHI_GCLK_MPEG1, 30), + MESON_GATE(CLKID_BOOT_ROM, HHI_GCLK_MPEG1, 31), + + MESON_GATE(CLKID_AHB_DATA_BUS, HHI_GCLK_MPEG2, 1), + MESON_GATE(CLKID_AHB_CTRL_BUS, HHI_GCLK_MPEG2, 2), + MESON_GATE(CLKID_HDMI_INTR_SYNC, HHI_GCLK_MPEG2, 3), + MESON_GATE(CLKID_HDMI_PCLK, HHI_GCLK_MPEG2, 4), + MESON_GATE(CLKID_USB1_DDR_BRIDGE, HHI_GCLK_MPEG2, 8), + MESON_GATE(CLKID_USB0_DDR_BRIDGE, HHI_GCLK_MPEG2, 9), + MESON_GATE(CLKID_MMC_PCLK, HHI_GCLK_MPEG2, 11), + MESON_GATE(CLKID_DVIN, HHI_GCLK_MPEG2, 12), + MESON_GATE(CLKID_UART2, HHI_GCLK_MPEG2, 15), + MESON_GATE(CLKID_SANA, HHI_GCLK_MPEG2, 22), + MESON_GATE(CLKID_VPU_INTR, HHI_GCLK_MPEG2, 25), + MESON_GATE(CLKID_SEC_AHB_AHB3_BRIDGE, HHI_GCLK_MPEG2, 26), + MESON_GATE(CLKID_CLK81_A53, HHI_GCLK_MPEG2, 29), + + MESON_GATE(CLKID_VCLK2_VENCI0, HHI_GCLK_OTHER, 1), + MESON_GATE(CLKID_VCLK2_VENCI1, HHI_GCLK_OTHER, 2), + MESON_GATE(CLKID_VCLK2_VENCP0, HHI_GCLK_OTHER, 3), + MESON_GATE(CLKID_VCLK2_VENCP1, HHI_GCLK_OTHER, 4), + MESON_GATE(CLKID_GCLK_VENCI_INT0, HHI_GCLK_OTHER, 8), + MESON_GATE(CLKID_DAC_CLK, HHI_GCLK_OTHER, 10), + MESON_GATE(CLKID_AOCLK_GATE, HHI_GCLK_OTHER, 14), + MESON_GATE(CLKID_IEC958_GATE, HHI_GCLK_OTHER, 16), + MESON_GATE(CLKID_ENC480P, HHI_GCLK_OTHER, 20), + MESON_GATE(CLKID_RNG1, HHI_GCLK_OTHER, 21), + MESON_GATE(CLKID_GCLK_VENCI_INT1, HHI_GCLK_OTHER, 22), + MESON_GATE(CLKID_VCLK2_VENCLMCC, HHI_GCLK_OTHER, 24), + MESON_GATE(CLKID_VCLK2_VENCL, HHI_GCLK_OTHER, 25), + MESON_GATE(CLKID_VCLK_OTHER, HHI_GCLK_OTHER, 26), + MESON_GATE(CLKID_EDP, HHI_GCLK_OTHER, 31), + + /* Always On (AO) domain gates */ + MESON_GATE(CLKID_AO_MEDIA_CPU, HHI_GCLK_AO, 0), + MESON_GATE(CLKID_AO_AHB_SRAM, HHI_GCLK_AO, 1), + MESON_GATE(CLKID_AO_AHB_BUS, HHI_GCLK_AO, 2), + MESON_GATE(CLKID_AO_IFACE, HHI_GCLK_AO, 3), + MESON_GATE(CLKID_AO_I2C, HHI_GCLK_AO, 4), + + /* PLL Gates */ + /* CLKID_FCLK_DIV2 is critical for the SCPI Processor */ + MESON_GATE(CLKID_FCLK_DIV3, HHI_MPLL_CNTL6, 28), + MESON_GATE(CLKID_FCLK_DIV4, HHI_MPLL_CNTL6, 29), + MESON_GATE(CLKID_FCLK_DIV5, HHI_MPLL_CNTL6, 30), + MESON_GATE(CLKID_FCLK_DIV7, HHI_MPLL_CNTL6, 31), + MESON_GATE(CLKID_MPLL0, HHI_MPLL_CNTL7, 14), + MESON_GATE(CLKID_MPLL1, HHI_MPLL_CNTL8, 14), + MESON_GATE(CLKID_MPLL2, HHI_MPLL_CNTL9, 14), + /* CLKID_CLK81 is critical for the system */ + + /* Peripheral Gates */ + MESON_GATE(CLKID_SAR_ADC_CLK, HHI_SAR_CLK_CNTL, 8), + MESON_GATE(CLKID_SD_EMMC_A_CLK0, HHI_SD_EMMC_CLK_CNTL, 7), + MESON_GATE(CLKID_SD_EMMC_B_CLK0, HHI_SD_EMMC_CLK_CNTL, 23), + MESON_GATE(CLKID_SD_EMMC_C_CLK0, HHI_NAND_CLK_CNTL, 7), +}; + +static int meson_set_gate(struct clk *clk, bool on) +{ + struct meson_clk *priv = dev_get_priv(clk->dev); + struct meson_gate *gate; + + if (clk->id >= ARRAY_SIZE(gates)) + return -ENOENT; + + gate = &gates[clk->id]; + + if (gate->reg == 0) + return 0; + + clrsetbits_le32(priv->addr + gate->reg, + BIT(gate->bit), on ? BIT(gate->bit) : 0); + return 0; +} + +static int meson_clk_enable(struct clk *clk) +{ + return meson_set_gate(clk, true); +} + +static int meson_clk_disable(struct clk *clk) +{ + return meson_set_gate(clk, false); +} + +static unsigned long meson_clk81_get_rate(struct clk *clk) +{ + struct meson_clk *priv = dev_get_priv(clk->dev); + unsigned long parent_rate; + u32 reg; + int parents[] = { + -1, + -1, + CLKID_FCLK_DIV7, + CLKID_MPLL1, + CLKID_MPLL2, + CLKID_FCLK_DIV4, + CLKID_FCLK_DIV3, + CLKID_FCLK_DIV5 + }; + + /* mux */ + reg = readl(priv->addr + HHI_MPEG_CLK_CNTL); + reg = (reg >> 12) & 7; + + switch (reg) { + case 0: + parent_rate = XTAL_RATE; + break; + case 1: + return -ENOENT; + default: + parent_rate = meson_clk_get_rate_by_id(clk, parents[reg]); + } + + /* divider */ + reg = readl(priv->addr + HHI_MPEG_CLK_CNTL); + reg = reg & ((1 << 7) - 1); + + return parent_rate / reg; +} + +static long mpll_rate_from_params(unsigned long parent_rate, + unsigned long sdm, + unsigned long n2) +{ + unsigned long divisor = (SDM_DEN * n2) + sdm; + + if (n2 < N2_MIN) + return -EINVAL; + + return DIV_ROUND_UP_ULL((u64)parent_rate * SDM_DEN, divisor); +} + +static struct parm meson_mpll0_parm[3] = { + {HHI_MPLL_CNTL7, 0, 14}, /* psdm */ + {HHI_MPLL_CNTL7, 16, 9}, /* pn2 */ +}; + +static struct parm meson_mpll1_parm[3] = { + {HHI_MPLL_CNTL8, 0, 14}, /* psdm */ + {HHI_MPLL_CNTL8, 16, 9}, /* pn2 */ +}; + +static struct parm meson_mpll2_parm[3] = { + {HHI_MPLL_CNTL9, 0, 14}, /* psdm */ + {HHI_MPLL_CNTL9, 16, 9}, /* pn2 */ +}; + +/* + * MultiPhase Locked Loops are outputs from a PLL with additional frequency + * scaling capabilities. MPLL rates are calculated as: + * + * f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384) + */ +static ulong meson_mpll_get_rate(struct clk *clk, unsigned long id) +{ + struct meson_clk *priv = dev_get_priv(clk->dev); + struct parm *psdm, *pn2; + unsigned long reg, sdm, n2; + unsigned long parent_rate; + + switch (id) { + case CLKID_MPLL0: + psdm = &meson_mpll0_parm[0]; + pn2 = &meson_mpll0_parm[1]; + break; + case CLKID_MPLL1: + psdm = &meson_mpll1_parm[0]; + pn2 = &meson_mpll1_parm[1]; + break; + case CLKID_MPLL2: + psdm = &meson_mpll2_parm[0]; + pn2 = &meson_mpll2_parm[1]; + break; + default: + return -ENOENT; + } + + parent_rate = meson_clk_get_rate_by_id(clk, CLKID_FIXED_PLL); + if (IS_ERR_VALUE(parent_rate)) + return parent_rate; + + reg = readl(priv->addr + psdm->reg_off); + sdm = PARM_GET(psdm->width, psdm->shift, reg); + + reg = readl(priv->addr + pn2->reg_off); + n2 = PARM_GET(pn2->width, pn2->shift, reg); + + return mpll_rate_from_params(parent_rate, sdm, n2); +} + +static struct parm meson_fixed_pll_parm[3] = { + {HHI_MPLL_CNTL, 0, 9}, /* pm */ + {HHI_MPLL_CNTL, 9, 5}, /* pn */ + {HHI_MPLL_CNTL, 16, 2}, /* pod */ +}; + +static struct parm meson_sys_pll_parm[3] = { + {HHI_SYS_PLL_CNTL, 0, 9}, /* pm */ + {HHI_SYS_PLL_CNTL, 9, 5}, /* pn */ + {HHI_SYS_PLL_CNTL, 10, 2}, /* pod */ +}; + +static ulong meson_pll_get_rate(struct clk *clk, unsigned long id) +{ + struct meson_clk *priv = dev_get_priv(clk->dev); + struct parm *pm, *pn, *pod; + unsigned long parent_rate_mhz = XTAL_RATE / 1000000; + u16 n, m, od; + u32 reg; + + switch (id) { + case CLKID_FIXED_PLL: + pm = &meson_fixed_pll_parm[0]; + pn = &meson_fixed_pll_parm[1]; + pod = &meson_fixed_pll_parm[2]; + break; + case CLKID_SYS_PLL: + pm = &meson_sys_pll_parm[0]; + pn = &meson_sys_pll_parm[1]; + pod = &meson_sys_pll_parm[2]; + break; + default: + return -ENOENT; + } + + reg = readl(priv->addr + pn->reg_off); + n = PARM_GET(pn->width, pn->shift, reg); + + reg = readl(priv->addr + pm->reg_off); + m = PARM_GET(pm->width, pm->shift, reg); + + reg = readl(priv->addr + pod->reg_off); + od = PARM_GET(pod->width, pod->shift, reg); + + return ((parent_rate_mhz * m / n) >> od) * 1000000; +} + +static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id) +{ + ulong rate; + + switch (id) { + case CLKID_FIXED_PLL: + case CLKID_SYS_PLL: + rate = meson_pll_get_rate(clk, id); + break; + case CLKID_FCLK_DIV2: + rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 2; + break; + case CLKID_FCLK_DIV3: + rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 3; + break; + case CLKID_FCLK_DIV4: + rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 4; + break; + case CLKID_FCLK_DIV5: + rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 5; + break; + case CLKID_FCLK_DIV7: + rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 7; + break; + case CLKID_MPLL0: + case CLKID_MPLL1: + case CLKID_MPLL2: + rate = meson_mpll_get_rate(clk, id); + break; + case CLKID_CLK81: + rate = meson_clk81_get_rate(clk); + break; + default: + if (gates[id].reg != 0) { + /* a clock gate */ + rate = meson_clk81_get_rate(clk); + break; + } + return -ENOENT; + } + + printf("clock %lu has rate %lu\n", id, rate); + return rate; +} + +static ulong meson_clk_get_rate(struct clk *clk) +{ + return meson_clk_get_rate_by_id(clk, clk->id); +} + +static int meson_clk_probe(struct udevice *dev) +{ + struct meson_clk *priv = dev_get_priv(dev); + + priv->addr = dev_read_addr_ptr(dev); + + debug("meson-clk: probed at addr %p\n", priv->addr); + + return 0; +} + +static struct clk_ops meson_clk_ops = { + .disable = meson_clk_disable, + .enable = meson_clk_enable, + .get_rate = meson_clk_get_rate, +}; + +static const struct udevice_id meson_clk_ids[] = { + { .compatible = "amlogic,gxbb-clkc" }, + { .compatible = "amlogic,gxl-clkc" }, + { } +}; + +U_BOOT_DRIVER(meson_clk) = { + .name = "meson_clk", + .id = UCLASS_CLK, + .of_match = meson_clk_ids, + .priv_auto_alloc_size = sizeof(struct meson_clk), + .ops = &meson_clk_ops, + .probe = meson_clk_probe, +}; diff --git a/drivers/clk/clk_meson.h b/drivers/clk/clk_meson.h new file mode 100644 index 0000000..7adc55a --- /dev/null +++ b/drivers/clk/clk_meson.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * (C) Copyright 2018 - Beniamino Galvani b.galvani@gmail.com + * (C) Copyright 2018 - BayLibre, SAS + * Author: Neil Armstrong narmstrong@baylibre.com + */ + +#ifndef CLK_MESON_H +#define CLK_MESON_H + +/* Gate Structure */ + +struct meson_gate { + unsigned int reg; + unsigned int bit; +}; + +#define MESON_GATE(id, _reg, _bit) \ + [id] = { \ + .reg = (_reg), \ + .bit = (_bit), \ + } + +/* PLL Parameters */ + +struct parm { + u16 reg_off; + u8 shift; + u8 width; +}; + +#define PMASK(width) GENMASK(width - 1, 0) +#define SETPMASK(width, shift) GENMASK(shift + width - 1, shift) +#define CLRPMASK(width, shift) (~SETPMASK(width, shift)) + +#define PARM_GET(width, shift, reg) \ + (((reg) & SETPMASK(width, shift)) >> (shift)) +#define PARM_SET(width, shift, reg, val) \ + (((reg) & CLRPMASK(width, shift)) | ((val) << (shift))) + +/* MPLL Parameters */ + +#define SDM_DEN 16384 +#define N2_MIN 4 +#define N2_MAX 511 + +#endif