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The Meson8/Meson8b/Meson8m2 SoCs embed a DDR clock controller in the
MMCBUS registers. There is no public documentation, but the u-boot GPL
sources from the Amlogic BSP show that the DDR clock controller is
identical on all three SoCs:
#define CFG_DDR_CLK 792
#define CFG_PLL_M (((CFG_DDR_CLK/12)*12)/24)
#define CFG_PLL_N 1
#define CFG_PLL_OD 1
// from set_ddr_clock:
t_ddr_pll_cntl= (CFG_PLL_OD << 16)|(CFG_PLL_N<<9)|(CFG_PLL_M<<0)
writel(timing_reg->t_ddr_pll_cntl|(1<<29),AM_DDR_PLL_CNTL);
writel(readl(AM_DDR_PLL_CNTL) & (~(1<<29)),AM_DDR_PLL_CNTL);
// from hx_ddr_power_down_enter: shut down DDR PLL
writel(readl(AM_DDR_PLL_CNTL)|(1<<30),AM_DDR_PLL_CNTL);
do { ... } while((readl(AM_DDR_PLL_CNTL)&(1<<31))==0)
This translates to:
- AM_DDR_PLL_CNTL[29] is the reset bit
- AM_DDR_PLL_CNTL[30] is the enable bit
- AM_DDR_PLL_CNTL[31] is the lock bit
- AM_DDR_PLL_CNTL[8:0] is the m value (assuming the width is 9 bits
based on the start of the n value)
- AM_DDR_PLL_CNTL[13:9] is the n value (assuming the width is 5 bits
based on the start of the od)
- AM_DDR_PLL_CNTL[17:16] is the od (assuming the width is 2 bits based
on other PLLs on this SoC)
Add a driver for this PLL setup because it's used as one of the inputs
of the audio clocks. There may be more clocks inside that clock
controller - those can be added in subsequent patches.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
22 lines
908 B
Makefile
22 lines
908 B
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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# Amlogic clock drivers
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obj-$(CONFIG_COMMON_CLK_MESON_AO_CLKC) += meson-aoclk.o
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obj-$(CONFIG_COMMON_CLK_MESON_CPU_DYNDIV) += clk-cpu-dyndiv.o
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obj-$(CONFIG_COMMON_CLK_MESON_DUALDIV) += clk-dualdiv.o
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obj-$(CONFIG_COMMON_CLK_MESON_EE_CLKC) += meson-eeclk.o
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obj-$(CONFIG_COMMON_CLK_MESON_MPLL) += clk-mpll.o
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obj-$(CONFIG_COMMON_CLK_MESON_PHASE) += clk-phase.o
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obj-$(CONFIG_COMMON_CLK_MESON_PLL) += clk-pll.o
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obj-$(CONFIG_COMMON_CLK_MESON_REGMAP) += clk-regmap.o
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obj-$(CONFIG_COMMON_CLK_MESON_SCLK_DIV) += sclk-div.o
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obj-$(CONFIG_COMMON_CLK_MESON_VID_PLL_DIV) += vid-pll-div.o
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# Amlogic Clock controllers
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obj-$(CONFIG_COMMON_CLK_AXG) += axg.o axg-aoclk.o
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obj-$(CONFIG_COMMON_CLK_AXG_AUDIO) += axg-audio.o
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obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o
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obj-$(CONFIG_COMMON_CLK_G12A) += g12a.o g12a-aoclk.o
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obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o meson8-ddr.o
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