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 --- arch/arm/mach-meson/Kconfig | 2 + drivers/clk/Makefile | 1 + drivers/clk/clk_meson.c | 196 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 199 insertions(+) create mode 100644 drivers/clk/clk_meson.c
diff --git a/arch/arm/mach-meson/Kconfig b/arch/arm/mach-meson/Kconfig index d4bd230be3..7acee3bc5c 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 bcc8f82fb6..67da27873d 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -7,6 +7,7 @@
obj-$(CONFIG_$(SPL_TPL_)CLK) += clk-uclass.o clk_fixed_rate.o obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ +obj-$(CONFIG_ARCH_MESON) += clk_meson.o obj-$(CONFIG_SANDBOX) += clk_sandbox.o obj-$(CONFIG_SANDBOX) += clk_sandbox_test.o obj-$(CONFIG_MACH_PIC32) += clk_pic32.o diff --git a/drivers/clk/clk_meson.c b/drivers/clk/clk_meson.c new file mode 100644 index 0000000000..3cf9372e05 --- /dev/null +++ b/drivers/clk/clk_meson.c @@ -0,0 +1,196 @@ +/* + * (C) Copyright 2017 - Beniamino Galvani b.galvani@gmail.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/arch/clock.h> +#include <asm/io.h> +#include <clk-uclass.h> +#include <dm.h> +#include <dt-bindings/clock/gxbb-clkc.h> + +struct meson_clk { + void __iomem *addr; + ulong rate; +}; + +struct meson_gate { + unsigned int reg; + unsigned int bit; +}; + +#define MESON_GATE(id, _reg, _bit) \ + [id] = { \ + .reg = (_reg), \ + .bit = (_bit), \ + } + +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), +}; + +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 -ENOENT; + + 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 ulong meson_clk_get_rate(struct clk *clk) +{ + struct meson_clk *priv = dev_get_priv(clk->dev); + + if (clk->id != CLKID_CLK81) { + if (clk->id >= ARRAY_SIZE(gates)) + return -ENOENT; + if (gates[clk->id].reg == 0) + return -ENOENT; + } + + /* Use cached value if available */ + if (priv->rate) + return priv->rate; + + priv->rate = meson_measure_clk_rate(CLK_81); + + return priv->rate; +} + +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, +};