new file mode 100644
@@ -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
@@ -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
@@ -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/
new file mode 100644
@@ -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,
+};
new file mode 100644
@@ -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