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c0fc1e215c
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>
393 lines
11 KiB
C
393 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2018 - Beniamino Galvani <b.galvani@gmail.com>
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* (C) Copyright 2018 - BayLibre, SAS
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <common.h>
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#include <asm/arch/clock.h>
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#include <asm/io.h>
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#include <clk-uclass.h>
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#include <div64.h>
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#include <dm.h>
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#include <dt-bindings/clock/gxbb-clkc.h>
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#include "clk_meson.h"
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#define XTAL_RATE 24000000
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struct meson_clk {
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void __iomem *addr;
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};
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static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id);
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struct meson_gate gates[] = {
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/* Everything Else (EE) domain gates */
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MESON_GATE(CLKID_DDR, HHI_GCLK_MPEG0, 0),
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MESON_GATE(CLKID_DOS, HHI_GCLK_MPEG0, 1),
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MESON_GATE(CLKID_ISA, HHI_GCLK_MPEG0, 5),
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MESON_GATE(CLKID_PL301, HHI_GCLK_MPEG0, 6),
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MESON_GATE(CLKID_PERIPHS, HHI_GCLK_MPEG0, 7),
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MESON_GATE(CLKID_SPICC, HHI_GCLK_MPEG0, 8),
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MESON_GATE(CLKID_I2C, HHI_GCLK_MPEG0, 9),
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MESON_GATE(CLKID_SAR_ADC, HHI_GCLK_MPEG0, 10),
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MESON_GATE(CLKID_SMART_CARD, HHI_GCLK_MPEG0, 11),
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MESON_GATE(CLKID_RNG0, HHI_GCLK_MPEG0, 12),
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MESON_GATE(CLKID_UART0, HHI_GCLK_MPEG0, 13),
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MESON_GATE(CLKID_SDHC, HHI_GCLK_MPEG0, 14),
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MESON_GATE(CLKID_STREAM, HHI_GCLK_MPEG0, 15),
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MESON_GATE(CLKID_ASYNC_FIFO, HHI_GCLK_MPEG0, 16),
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MESON_GATE(CLKID_SDIO, HHI_GCLK_MPEG0, 17),
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MESON_GATE(CLKID_ABUF, HHI_GCLK_MPEG0, 18),
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MESON_GATE(CLKID_HIU_IFACE, HHI_GCLK_MPEG0, 19),
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MESON_GATE(CLKID_ASSIST_MISC, HHI_GCLK_MPEG0, 23),
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MESON_GATE(CLKID_SD_EMMC_A, HHI_GCLK_MPEG0, 24),
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MESON_GATE(CLKID_SD_EMMC_B, HHI_GCLK_MPEG0, 25),
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MESON_GATE(CLKID_SD_EMMC_C, HHI_GCLK_MPEG0, 26),
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MESON_GATE(CLKID_SPI, HHI_GCLK_MPEG0, 30),
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MESON_GATE(CLKID_I2S_SPDIF, HHI_GCLK_MPEG1, 2),
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MESON_GATE(CLKID_ETH, HHI_GCLK_MPEG1, 3),
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MESON_GATE(CLKID_DEMUX, HHI_GCLK_MPEG1, 4),
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MESON_GATE(CLKID_AIU_GLUE, HHI_GCLK_MPEG1, 6),
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MESON_GATE(CLKID_IEC958, HHI_GCLK_MPEG1, 7),
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MESON_GATE(CLKID_I2S_OUT, HHI_GCLK_MPEG1, 8),
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MESON_GATE(CLKID_AMCLK, HHI_GCLK_MPEG1, 9),
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MESON_GATE(CLKID_AIFIFO2, HHI_GCLK_MPEG1, 10),
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MESON_GATE(CLKID_MIXER, HHI_GCLK_MPEG1, 11),
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MESON_GATE(CLKID_MIXER_IFACE, HHI_GCLK_MPEG1, 12),
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MESON_GATE(CLKID_ADC, HHI_GCLK_MPEG1, 13),
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MESON_GATE(CLKID_BLKMV, HHI_GCLK_MPEG1, 14),
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MESON_GATE(CLKID_AIU, HHI_GCLK_MPEG1, 15),
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MESON_GATE(CLKID_UART1, HHI_GCLK_MPEG1, 16),
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MESON_GATE(CLKID_G2D, HHI_GCLK_MPEG1, 20),
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MESON_GATE(CLKID_USB0, HHI_GCLK_MPEG1, 21),
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MESON_GATE(CLKID_USB1, HHI_GCLK_MPEG1, 22),
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MESON_GATE(CLKID_RESET, HHI_GCLK_MPEG1, 23),
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MESON_GATE(CLKID_NAND, HHI_GCLK_MPEG1, 24),
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MESON_GATE(CLKID_DOS_PARSER, HHI_GCLK_MPEG1, 25),
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MESON_GATE(CLKID_USB, HHI_GCLK_MPEG1, 26),
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MESON_GATE(CLKID_VDIN1, HHI_GCLK_MPEG1, 28),
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MESON_GATE(CLKID_AHB_ARB0, HHI_GCLK_MPEG1, 29),
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MESON_GATE(CLKID_EFUSE, HHI_GCLK_MPEG1, 30),
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MESON_GATE(CLKID_BOOT_ROM, HHI_GCLK_MPEG1, 31),
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MESON_GATE(CLKID_AHB_DATA_BUS, HHI_GCLK_MPEG2, 1),
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MESON_GATE(CLKID_AHB_CTRL_BUS, HHI_GCLK_MPEG2, 2),
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MESON_GATE(CLKID_HDMI_INTR_SYNC, HHI_GCLK_MPEG2, 3),
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MESON_GATE(CLKID_HDMI_PCLK, HHI_GCLK_MPEG2, 4),
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MESON_GATE(CLKID_USB1_DDR_BRIDGE, HHI_GCLK_MPEG2, 8),
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MESON_GATE(CLKID_USB0_DDR_BRIDGE, HHI_GCLK_MPEG2, 9),
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MESON_GATE(CLKID_MMC_PCLK, HHI_GCLK_MPEG2, 11),
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MESON_GATE(CLKID_DVIN, HHI_GCLK_MPEG2, 12),
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MESON_GATE(CLKID_UART2, HHI_GCLK_MPEG2, 15),
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MESON_GATE(CLKID_SANA, HHI_GCLK_MPEG2, 22),
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MESON_GATE(CLKID_VPU_INTR, HHI_GCLK_MPEG2, 25),
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MESON_GATE(CLKID_SEC_AHB_AHB3_BRIDGE, HHI_GCLK_MPEG2, 26),
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MESON_GATE(CLKID_CLK81_A53, HHI_GCLK_MPEG2, 29),
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MESON_GATE(CLKID_VCLK2_VENCI0, HHI_GCLK_OTHER, 1),
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MESON_GATE(CLKID_VCLK2_VENCI1, HHI_GCLK_OTHER, 2),
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MESON_GATE(CLKID_VCLK2_VENCP0, HHI_GCLK_OTHER, 3),
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MESON_GATE(CLKID_VCLK2_VENCP1, HHI_GCLK_OTHER, 4),
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MESON_GATE(CLKID_GCLK_VENCI_INT0, HHI_GCLK_OTHER, 8),
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MESON_GATE(CLKID_DAC_CLK, HHI_GCLK_OTHER, 10),
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MESON_GATE(CLKID_AOCLK_GATE, HHI_GCLK_OTHER, 14),
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MESON_GATE(CLKID_IEC958_GATE, HHI_GCLK_OTHER, 16),
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MESON_GATE(CLKID_ENC480P, HHI_GCLK_OTHER, 20),
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MESON_GATE(CLKID_RNG1, HHI_GCLK_OTHER, 21),
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MESON_GATE(CLKID_GCLK_VENCI_INT1, HHI_GCLK_OTHER, 22),
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MESON_GATE(CLKID_VCLK2_VENCLMCC, HHI_GCLK_OTHER, 24),
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MESON_GATE(CLKID_VCLK2_VENCL, HHI_GCLK_OTHER, 25),
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MESON_GATE(CLKID_VCLK_OTHER, HHI_GCLK_OTHER, 26),
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MESON_GATE(CLKID_EDP, HHI_GCLK_OTHER, 31),
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/* Always On (AO) domain gates */
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MESON_GATE(CLKID_AO_MEDIA_CPU, HHI_GCLK_AO, 0),
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MESON_GATE(CLKID_AO_AHB_SRAM, HHI_GCLK_AO, 1),
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MESON_GATE(CLKID_AO_AHB_BUS, HHI_GCLK_AO, 2),
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MESON_GATE(CLKID_AO_IFACE, HHI_GCLK_AO, 3),
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MESON_GATE(CLKID_AO_I2C, HHI_GCLK_AO, 4),
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/* PLL Gates */
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/* CLKID_FCLK_DIV2 is critical for the SCPI Processor */
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MESON_GATE(CLKID_FCLK_DIV3, HHI_MPLL_CNTL6, 28),
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MESON_GATE(CLKID_FCLK_DIV4, HHI_MPLL_CNTL6, 29),
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MESON_GATE(CLKID_FCLK_DIV5, HHI_MPLL_CNTL6, 30),
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MESON_GATE(CLKID_FCLK_DIV7, HHI_MPLL_CNTL6, 31),
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MESON_GATE(CLKID_MPLL0, HHI_MPLL_CNTL7, 14),
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MESON_GATE(CLKID_MPLL1, HHI_MPLL_CNTL8, 14),
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MESON_GATE(CLKID_MPLL2, HHI_MPLL_CNTL9, 14),
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/* CLKID_CLK81 is critical for the system */
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/* Peripheral Gates */
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MESON_GATE(CLKID_SAR_ADC_CLK, HHI_SAR_CLK_CNTL, 8),
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MESON_GATE(CLKID_SD_EMMC_A_CLK0, HHI_SD_EMMC_CLK_CNTL, 7),
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MESON_GATE(CLKID_SD_EMMC_B_CLK0, HHI_SD_EMMC_CLK_CNTL, 23),
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MESON_GATE(CLKID_SD_EMMC_C_CLK0, HHI_NAND_CLK_CNTL, 7),
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};
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static int meson_set_gate(struct clk *clk, bool on)
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{
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struct meson_clk *priv = dev_get_priv(clk->dev);
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struct meson_gate *gate;
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if (clk->id >= ARRAY_SIZE(gates))
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return -ENOENT;
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gate = &gates[clk->id];
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if (gate->reg == 0)
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return 0;
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clrsetbits_le32(priv->addr + gate->reg,
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BIT(gate->bit), on ? BIT(gate->bit) : 0);
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return 0;
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}
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static int meson_clk_enable(struct clk *clk)
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{
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return meson_set_gate(clk, true);
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}
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static int meson_clk_disable(struct clk *clk)
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{
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return meson_set_gate(clk, false);
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}
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static unsigned long meson_clk81_get_rate(struct clk *clk)
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{
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struct meson_clk *priv = dev_get_priv(clk->dev);
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unsigned long parent_rate;
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u32 reg;
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int parents[] = {
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-1,
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-1,
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CLKID_FCLK_DIV7,
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CLKID_MPLL1,
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CLKID_MPLL2,
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CLKID_FCLK_DIV4,
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CLKID_FCLK_DIV3,
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CLKID_FCLK_DIV5
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};
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/* mux */
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reg = readl(priv->addr + HHI_MPEG_CLK_CNTL);
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reg = (reg >> 12) & 7;
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switch (reg) {
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case 0:
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parent_rate = XTAL_RATE;
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break;
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case 1:
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return -ENOENT;
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default:
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parent_rate = meson_clk_get_rate_by_id(clk, parents[reg]);
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}
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/* divider */
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reg = readl(priv->addr + HHI_MPEG_CLK_CNTL);
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reg = reg & ((1 << 7) - 1);
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return parent_rate / reg;
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}
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static long mpll_rate_from_params(unsigned long parent_rate,
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unsigned long sdm,
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unsigned long n2)
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{
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unsigned long divisor = (SDM_DEN * n2) + sdm;
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if (n2 < N2_MIN)
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return -EINVAL;
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return DIV_ROUND_UP_ULL((u64)parent_rate * SDM_DEN, divisor);
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}
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static struct parm meson_mpll0_parm[3] = {
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{HHI_MPLL_CNTL7, 0, 14}, /* psdm */
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{HHI_MPLL_CNTL7, 16, 9}, /* pn2 */
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};
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static struct parm meson_mpll1_parm[3] = {
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{HHI_MPLL_CNTL8, 0, 14}, /* psdm */
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{HHI_MPLL_CNTL8, 16, 9}, /* pn2 */
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};
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static struct parm meson_mpll2_parm[3] = {
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{HHI_MPLL_CNTL9, 0, 14}, /* psdm */
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{HHI_MPLL_CNTL9, 16, 9}, /* pn2 */
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};
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/*
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* MultiPhase Locked Loops are outputs from a PLL with additional frequency
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* scaling capabilities. MPLL rates are calculated as:
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*
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* f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384)
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*/
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static ulong meson_mpll_get_rate(struct clk *clk, unsigned long id)
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{
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struct meson_clk *priv = dev_get_priv(clk->dev);
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struct parm *psdm, *pn2;
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unsigned long reg, sdm, n2;
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unsigned long parent_rate;
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switch (id) {
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case CLKID_MPLL0:
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psdm = &meson_mpll0_parm[0];
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pn2 = &meson_mpll0_parm[1];
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break;
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case CLKID_MPLL1:
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psdm = &meson_mpll1_parm[0];
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pn2 = &meson_mpll1_parm[1];
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break;
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case CLKID_MPLL2:
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psdm = &meson_mpll2_parm[0];
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pn2 = &meson_mpll2_parm[1];
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break;
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default:
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return -ENOENT;
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}
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parent_rate = meson_clk_get_rate_by_id(clk, CLKID_FIXED_PLL);
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if (IS_ERR_VALUE(parent_rate))
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return parent_rate;
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reg = readl(priv->addr + psdm->reg_off);
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sdm = PARM_GET(psdm->width, psdm->shift, reg);
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reg = readl(priv->addr + pn2->reg_off);
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n2 = PARM_GET(pn2->width, pn2->shift, reg);
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return mpll_rate_from_params(parent_rate, sdm, n2);
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}
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static struct parm meson_fixed_pll_parm[3] = {
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{HHI_MPLL_CNTL, 0, 9}, /* pm */
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{HHI_MPLL_CNTL, 9, 5}, /* pn */
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{HHI_MPLL_CNTL, 16, 2}, /* pod */
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};
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static struct parm meson_sys_pll_parm[3] = {
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{HHI_SYS_PLL_CNTL, 0, 9}, /* pm */
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{HHI_SYS_PLL_CNTL, 9, 5}, /* pn */
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{HHI_SYS_PLL_CNTL, 10, 2}, /* pod */
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};
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static ulong meson_pll_get_rate(struct clk *clk, unsigned long id)
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{
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struct meson_clk *priv = dev_get_priv(clk->dev);
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struct parm *pm, *pn, *pod;
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unsigned long parent_rate_mhz = XTAL_RATE / 1000000;
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u16 n, m, od;
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u32 reg;
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switch (id) {
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case CLKID_FIXED_PLL:
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pm = &meson_fixed_pll_parm[0];
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pn = &meson_fixed_pll_parm[1];
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pod = &meson_fixed_pll_parm[2];
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break;
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case CLKID_SYS_PLL:
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pm = &meson_sys_pll_parm[0];
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pn = &meson_sys_pll_parm[1];
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pod = &meson_sys_pll_parm[2];
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break;
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default:
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return -ENOENT;
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}
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reg = readl(priv->addr + pn->reg_off);
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n = PARM_GET(pn->width, pn->shift, reg);
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reg = readl(priv->addr + pm->reg_off);
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m = PARM_GET(pm->width, pm->shift, reg);
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reg = readl(priv->addr + pod->reg_off);
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od = PARM_GET(pod->width, pod->shift, reg);
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return ((parent_rate_mhz * m / n) >> od) * 1000000;
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}
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static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id)
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{
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ulong rate;
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switch (id) {
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case CLKID_FIXED_PLL:
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case CLKID_SYS_PLL:
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rate = meson_pll_get_rate(clk, id);
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break;
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case CLKID_FCLK_DIV2:
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rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 2;
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break;
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case CLKID_FCLK_DIV3:
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rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 3;
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break;
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case CLKID_FCLK_DIV4:
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rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 4;
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break;
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case CLKID_FCLK_DIV5:
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rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 5;
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break;
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case CLKID_FCLK_DIV7:
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rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 7;
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break;
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case CLKID_MPLL0:
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case CLKID_MPLL1:
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case CLKID_MPLL2:
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rate = meson_mpll_get_rate(clk, id);
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break;
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case CLKID_CLK81:
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rate = meson_clk81_get_rate(clk);
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break;
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default:
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if (gates[id].reg != 0) {
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/* a clock gate */
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rate = meson_clk81_get_rate(clk);
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break;
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}
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return -ENOENT;
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}
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printf("clock %lu has rate %lu\n", id, rate);
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return rate;
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}
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static ulong meson_clk_get_rate(struct clk *clk)
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{
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return meson_clk_get_rate_by_id(clk, clk->id);
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}
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static int meson_clk_probe(struct udevice *dev)
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{
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struct meson_clk *priv = dev_get_priv(dev);
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priv->addr = dev_read_addr_ptr(dev);
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debug("meson-clk: probed at addr %p\n", priv->addr);
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return 0;
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}
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static struct clk_ops meson_clk_ops = {
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.disable = meson_clk_disable,
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.enable = meson_clk_enable,
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.get_rate = meson_clk_get_rate,
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};
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static const struct udevice_id meson_clk_ids[] = {
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{ .compatible = "amlogic,gxbb-clkc" },
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{ .compatible = "amlogic,gxl-clkc" },
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{ }
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};
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U_BOOT_DRIVER(meson_clk) = {
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.name = "meson_clk",
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.id = UCLASS_CLK,
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.of_match = meson_clk_ids,
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.priv_auto_alloc_size = sizeof(struct meson_clk),
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.ops = &meson_clk_ops,
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.probe = meson_clk_probe,
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};
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