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Message-ID: <CACPK8XdRuD__67eAUK2DPN-unObCBs64S2rewdD1fyzLfT1Yxg@mail.gmail.com>
Date: Fri, 22 Sep 2023 06:08:11 +0000
From: Joel Stanley <joel@....id.au>
To: Tomer Maimon <tmaimon77@...il.com>
Cc: mturquette@...libre.com, sboyd@...nel.org, avifishman70@...il.com,
tali.perry1@...il.com, venture@...gle.com, yuenn@...gle.com,
benjaminfair@...gle.com, openbmc@...ts.ozlabs.org,
linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v19 1/1] clk: npcm8xx: add clock controller
On Tue, 19 Sept 2023 at 06:11, Tomer Maimon <tmaimon77@...il.com> wrote:
>
> Nuvoton Arbel BMC NPCM8XX contains an integrated clock controller which
> generates and supplies clocks to all modules within the BMC.
>
> Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
Acked-by: Joel Stanley <joel@....id.au>
I am not a clk reviewer, but this looks similar enough to other clk
drivers that I think it could be merged, and further improvements made
in the tree.
> ---
> drivers/clk/Kconfig | 8 +
> drivers/clk/Makefile | 1 +
> drivers/clk/clk-npcm8xx.c | 565 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 574 insertions(+)
> create mode 100644 drivers/clk/clk-npcm8xx.c
>
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index c30099866174..9bc5f2dfc7e2 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -325,6 +325,14 @@ config COMMON_CLK_LOCHNAGAR
> This driver supports the clocking features of the Cirrus Logic
> Lochnagar audio development board.
>
> +config COMMON_CLK_NPCM8XX
> + tristate "Clock driver for the NPCM8XX SoC Family"
> + depends on ARCH_NPCM || COMPILE_TEST
> + help
> + This driver supports the clocks on the Nuvoton BMC NPCM8XX SoC Family,
> + all the clocks are initialized by the bootloader, so this driver
> + allows only reading of current settings directly from the hardware.
> +
> config COMMON_CLK_LOONGSON2
> bool "Clock driver for Loongson-2 SoC"
> depends on LOONGARCH || COMPILE_TEST
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index 18969cbd4bb1..e2cbc6cceb8c 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -51,6 +51,7 @@ obj-$(CONFIG_ARCH_MILBEAUT_M10V) += clk-milbeaut.o
> obj-$(CONFIG_ARCH_MOXART) += clk-moxart.o
> obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o
> obj-$(CONFIG_ARCH_NPCM7XX) += clk-npcm7xx.o
> +obj-$(CONFIG_COMMON_CLK_NPCM8XX) += clk-npcm8xx.o
> obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o
> obj-$(CONFIG_COMMON_CLK_PALMAS) += clk-palmas.o
> obj-$(CONFIG_CLK_LS1028A_PLLDIG) += clk-plldig.o
> diff --git a/drivers/clk/clk-npcm8xx.c b/drivers/clk/clk-npcm8xx.c
> new file mode 100644
> index 000000000000..16c50aa9cb65
> --- /dev/null
> +++ b/drivers/clk/clk-npcm8xx.c
> @@ -0,0 +1,565 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Nuvoton NPCM8xx Clock Generator
> + * All the clocks are initialized by the bootloader, so this driver allows only
> + * reading of current settings directly from the hardware.
> + *
> + * Copyright (C) 2020 Nuvoton Technologies
> + * Author: Tomer Maimon <tomer.maimon@...oton.com>
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/clk-provider.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +#include <dt-bindings/clock/nuvoton,npcm845-clk.h>
> +
> +/* npcm8xx clock registers*/
> +#define NPCM8XX_CLKSEL 0x04
> +#define NPCM8XX_CLKDIV1 0x08
> +#define NPCM8XX_CLKDIV2 0x2C
> +#define NPCM8XX_CLKDIV3 0x58
> +#define NPCM8XX_CLKDIV4 0x7C
> +#define NPCM8XX_PLLCON0 0x0C
> +#define NPCM8XX_PLLCON1 0x10
> +#define NPCM8XX_PLLCON2 0x54
> +#define NPCM8XX_PLLCONG 0x60
> +#define NPCM8XX_THRTL_CNT 0xC0
> +
> +#define PLLCON_LOKI BIT(31)
> +#define PLLCON_LOKS BIT(30)
> +#define PLLCON_FBDV GENMASK(27, 16)
> +#define PLLCON_OTDV2 GENMASK(15, 13)
> +#define PLLCON_PWDEN BIT(12)
> +#define PLLCON_OTDV1 GENMASK(10, 8)
> +#define PLLCON_INDV GENMASK(5, 0)
> +
> +struct npcm8xx_clk_pll {
> + void __iomem *pllcon;
> + unsigned int id;
> + const char *name;
> + unsigned long flags;
> + struct clk_hw hw;
> +};
> +
> +#define to_npcm8xx_clk_pll(_hw) container_of(_hw, struct npcm8xx_clk_pll, hw)
> +
> +struct npcm8xx_pll_data {
> + const char *name;
> + struct clk_parent_data parent;
> + unsigned int reg;
> + unsigned long flags;
> + struct clk_hw hw;
> +};
> +
> +struct npcm8xx_clk_div_data {
> + u32 reg;
> + u8 shift;
> + u8 width;
> + const char *name;
> + const struct clk_parent_data parent_data;
> + u8 clk_divider_flags;
> + unsigned long flags;
> + int onecell_idx;
> +};
> +
> +struct npcm8xx_clk_mux_data {
> + u8 shift;
> + u32 mask;
> + const u32 *table;
> + const char *name;
> + const struct clk_parent_data *parent_data;
> + u8 num_parents;
> + unsigned long flags;
> + struct clk_hw hw;
> +};
> +
> +/* external clock definition */
> +#define NPCM8XX_CLK_S_REFCLK "refclk"
> +
> +/* pll definition */
> +#define NPCM8XX_CLK_S_PLL0 "pll0"
> +#define NPCM8XX_CLK_S_PLL1 "pll1"
> +#define NPCM8XX_CLK_S_PLL2 "pll2"
> +#define NPCM8XX_CLK_S_PLL_GFX "pll_gfx"
> +
> +/* early divider definition */
> +#define NPCM8XX_CLK_S_PLL2_DIV2 "pll2_div2"
> +#define NPCM8XX_CLK_S_PLL_GFX_DIV2 "pll_gfx_div2"
> +#define NPCM8XX_CLK_S_PLL1_DIV2 "pll1_div2"
> +
> +/* mux definition */
> +#define NPCM8XX_CLK_S_CPU_MUX "cpu_mux"
> +#define NPCM8XX_CLK_S_PIX_MUX "gfx_pixel_mux"
> +#define NPCM8XX_CLK_S_SD_MUX "sd_mux"
> +#define NPCM8XX_CLK_S_UART_MUX "uart_mux"
> +#define NPCM8XX_CLK_S_SU_MUX "serial_usb_mux"
> +#define NPCM8XX_CLK_S_MC_MUX "mc_mux"
> +#define NPCM8XX_CLK_S_ADC_MUX "adc_mux"
> +#define NPCM8XX_CLK_S_GFX_MUX "gfx_mux"
> +#define NPCM8XX_CLK_S_CLKOUT_MUX "clkout_mux"
> +#define NPCM8XX_CLK_S_GFXM_MUX "gfxm_mux"
> +#define NPCM8XX_CLK_S_DVC_MUX "dvc_mux"
> +#define NPCM8XX_CLK_S_RG_MUX "rg_mux"
> +#define NPCM8XX_CLK_S_RCP_MUX "rcp_mux"
> +
> +/* div definition */
> +#define NPCM8XX_CLK_S_MC "mc"
> +#define NPCM8XX_CLK_S_AXI "axi"
> +#define NPCM8XX_CLK_S_AHB "ahb"
> +#define NPCM8XX_CLK_S_SPI0 "spi0"
> +#define NPCM8XX_CLK_S_SPI1 "spi1"
> +#define NPCM8XX_CLK_S_SPI3 "spi3"
> +#define NPCM8XX_CLK_S_SPIX "spix"
> +#define NPCM8XX_CLK_S_APB1 "apb1"
> +#define NPCM8XX_CLK_S_APB2 "apb2"
> +#define NPCM8XX_CLK_S_APB3 "apb3"
> +#define NPCM8XX_CLK_S_APB4 "apb4"
> +#define NPCM8XX_CLK_S_APB5 "apb5"
> +#define NPCM8XX_CLK_S_APB19 "apb19"
> +#define NPCM8XX_CLK_S_TOCK "tock"
> +#define NPCM8XX_CLK_S_CLKOUT "clkout"
> +#define NPCM8XX_CLK_S_PRE_ADC "pre adc"
> +#define NPCM8XX_CLK_S_UART "uart"
> +#define NPCM8XX_CLK_S_UART2 "uart2"
> +#define NPCM8XX_CLK_S_TIMER "timer"
> +#define NPCM8XX_CLK_S_MMC "mmc"
> +#define NPCM8XX_CLK_S_SDHC "sdhc"
> +#define NPCM8XX_CLK_S_ADC "adc"
> +#define NPCM8XX_CLK_S_GFX "gfx0_gfx1_mem"
> +#define NPCM8XX_CLK_S_USBIF "serial_usbif"
> +#define NPCM8XX_CLK_S_USB_HOST "usb_host"
> +#define NPCM8XX_CLK_S_USB_BRIDGE "usb_bridge"
> +#define NPCM8XX_CLK_S_PCI "pci"
> +#define NPCM8XX_CLK_S_TH "th"
> +#define NPCM8XX_CLK_S_ATB "atb"
> +#define NPCM8XX_CLK_S_PRE_CLK "pre_clk"
> +#define NPCM8XX_CLK_S_RG "rg"
> +#define NPCM8XX_CLK_S_RCP "rcp"
> +
> +static struct clk_hw hw_pll1_div2, hw_pll2_div2, hw_gfx_div2, hw_pre_clk;
> +static struct npcm8xx_pll_data npcm8xx_pll_clks[] = {
> + { NPCM8XX_CLK_S_PLL0, { .name = NPCM8XX_CLK_S_REFCLK }, NPCM8XX_PLLCON0, 0 },
> + { NPCM8XX_CLK_S_PLL1, { .name = NPCM8XX_CLK_S_REFCLK }, NPCM8XX_PLLCON1, 0 },
> + { NPCM8XX_CLK_S_PLL2, { .name = NPCM8XX_CLK_S_REFCLK }, NPCM8XX_PLLCON2, 0 },
> + { NPCM8XX_CLK_S_PLL_GFX, { .name = NPCM8XX_CLK_S_REFCLK }, NPCM8XX_PLLCONG, 0 },
> +};
> +
> +static const u32 cpuck_mux_table[] = { 0, 1, 2, 7 };
> +static const struct clk_parent_data cpuck_mux_parents[] = {
> + { .hw = &npcm8xx_pll_clks[0].hw },
> + { .hw = &npcm8xx_pll_clks[1].hw },
> + { .index = 0 },
> + { .hw = &npcm8xx_pll_clks[2].hw }
> +};
> +
> +static const u32 pixcksel_mux_table[] = { 0, 2 };
> +static const struct clk_parent_data pixcksel_mux_parents[] = {
> + { .hw = &npcm8xx_pll_clks[3].hw },
> + { .index = 0 }
> +};
> +
> +static const u32 default_mux_table[] = { 0, 1, 2, 3 };
> +static const struct clk_parent_data default_mux_parents[] = {
> + { .hw = &npcm8xx_pll_clks[0].hw },
> + { .hw = &npcm8xx_pll_clks[1].hw },
> + { .index = 0 },
> + { .hw = &hw_pll2_div2 }
> +};
> +
> +static const u32 sucksel_mux_table[] = { 2, 3 };
> +static const struct clk_parent_data sucksel_mux_parents[] = {
> + { .index = 0 },
> + { .hw = &hw_pll2_div2 }
> +};
> +
> +static const u32 mccksel_mux_table[] = { 0, 2 };
> +static const struct clk_parent_data mccksel_mux_parents[] = {
> + { .hw = &hw_pll1_div2 },
> + { .index = 0 }
> +};
> +
> +static const u32 clkoutsel_mux_table[] = { 0, 1, 2, 3, 4 };
> +static const struct clk_parent_data clkoutsel_mux_parents[] = {
> + { .hw = &npcm8xx_pll_clks[0].hw },
> + { .hw = &npcm8xx_pll_clks[1].hw },
> + { .index = 0 },
> + { .hw = &hw_gfx_div2 },
> + { .hw = &hw_pll2_div2 }
> +};
> +
> +static const u32 gfxmsel_mux_table[] = { 2, 3 };
> +static const struct clk_parent_data gfxmsel_mux_parents[] = {
> + { .index = 0 },
> + { .hw = &npcm8xx_pll_clks[2].hw }
> +};
> +
> +static const u32 dvcssel_mux_table[] = { 2, 3 };
> +static const struct clk_parent_data dvcssel_mux_parents[] = {
> + { .index = 0 },
> + { .hw = &npcm8xx_pll_clks[2].hw }
> +};
> +
> +static const u32 default3_mux_table[] = { 0, 1, 2 };
> +static const struct clk_parent_data default3_mux_parents[] = {
> + { .hw = &npcm8xx_pll_clks[0].hw },
> + { .hw = &npcm8xx_pll_clks[1].hw },
> + { .index = 0 }
> +};
> +
> +static struct npcm8xx_clk_mux_data npcm8xx_muxes[] = {
> + { 0, 3, cpuck_mux_table, NPCM8XX_CLK_S_CPU_MUX, cpuck_mux_parents,
> + ARRAY_SIZE(cpuck_mux_parents), CLK_IS_CRITICAL },
> + { 4, 2, pixcksel_mux_table, NPCM8XX_CLK_S_PIX_MUX, pixcksel_mux_parents,
> + ARRAY_SIZE(pixcksel_mux_parents), 0 },
> + { 6, 2, default_mux_table, NPCM8XX_CLK_S_SD_MUX, default_mux_parents,
> + ARRAY_SIZE(default_mux_parents), 0 },
> + { 8, 2, default_mux_table, NPCM8XX_CLK_S_UART_MUX, default_mux_parents,
> + ARRAY_SIZE(default_mux_parents), 0 },
> + { 10, 2, sucksel_mux_table, NPCM8XX_CLK_S_SU_MUX, sucksel_mux_parents,
> + ARRAY_SIZE(sucksel_mux_parents), 0 },
> + { 12, 2, mccksel_mux_table, NPCM8XX_CLK_S_MC_MUX, mccksel_mux_parents,
> + ARRAY_SIZE(mccksel_mux_parents), 0 },
> + { 14, 2, default_mux_table, NPCM8XX_CLK_S_ADC_MUX, default_mux_parents,
> + ARRAY_SIZE(default_mux_parents), 0 },
> + { 16, 2, default_mux_table, NPCM8XX_CLK_S_GFX_MUX, default_mux_parents,
> + ARRAY_SIZE(default_mux_parents), 0 },
> + { 18, 3, clkoutsel_mux_table, NPCM8XX_CLK_S_CLKOUT_MUX, clkoutsel_mux_parents,
> + ARRAY_SIZE(clkoutsel_mux_parents), 0 },
> + { 21, 2, gfxmsel_mux_table, NPCM8XX_CLK_S_GFXM_MUX, gfxmsel_mux_parents,
> + ARRAY_SIZE(gfxmsel_mux_parents), 0 },
> + { 23, 2, dvcssel_mux_table, NPCM8XX_CLK_S_DVC_MUX, dvcssel_mux_parents,
> + ARRAY_SIZE(dvcssel_mux_parents), 0 },
> + { 25, 2, default3_mux_table, NPCM8XX_CLK_S_RG_MUX, default3_mux_parents,
> + ARRAY_SIZE(default3_mux_parents), 0 },
> + { 27, 2, default3_mux_table, NPCM8XX_CLK_S_RCP_MUX, default3_mux_parents,
> + ARRAY_SIZE(default3_mux_parents), 0 },
> +};
> +
> +/* configurable dividers: */
> +static const struct npcm8xx_clk_div_data npcm8xx_divs[] = {
> + { NPCM8XX_CLKDIV1, 28, 3, NPCM8XX_CLK_S_ADC,
> + { .name = NPCM8XX_CLK_S_PRE_ADC, .index = -1 },
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_ADC },
> + { NPCM8XX_CLKDIV1, 26, 2, NPCM8XX_CLK_S_AHB, { .hw = &hw_pre_clk },
> + CLK_DIVIDER_READ_ONLY, CLK_IS_CRITICAL, NPCM8XX_CLK_AHB },
> + { NPCM8XX_CLKDIV1, 21, 5, NPCM8XX_CLK_S_PRE_ADC,
> + { .hw = &npcm8xx_muxes[6].hw }, CLK_DIVIDER_READ_ONLY, 0, -1 },
> + { NPCM8XX_CLKDIV1, 16, 5, NPCM8XX_CLK_S_UART,
> + { .hw = &npcm8xx_muxes[3].hw }, 0, 0, NPCM8XX_CLK_UART },
> + { NPCM8XX_CLKDIV1, 11, 5, NPCM8XX_CLK_S_MMC,
> + { .hw = &npcm8xx_muxes[2].hw }, CLK_DIVIDER_READ_ONLY, 0,
> + NPCM8XX_CLK_MMC },
> + { NPCM8XX_CLKDIV1, 6, 5, NPCM8XX_CLK_S_SPI3,
> + { .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB }, 0, 0,
> + NPCM8XX_CLK_SPI3 },
> + { NPCM8XX_CLKDIV1, 2, 4, NPCM8XX_CLK_S_PCI,
> + { .hw = &npcm8xx_muxes[7].hw }, CLK_DIVIDER_READ_ONLY, 0,
> + NPCM8XX_CLK_PCI },
> +
> + { NPCM8XX_CLKDIV2, 30, 2, NPCM8XX_CLK_S_APB4,
> + { .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB4 },
> + { NPCM8XX_CLKDIV2, 28, 2, NPCM8XX_CLK_S_APB3,
> + { .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB3 },
> + { NPCM8XX_CLKDIV2, 26, 2, NPCM8XX_CLK_S_APB2,
> + { .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB2 },
> + { NPCM8XX_CLKDIV2, 24, 2, NPCM8XX_CLK_S_APB1,
> + { .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB1 },
> + { NPCM8XX_CLKDIV2, 22, 2, NPCM8XX_CLK_S_APB5,
> + { .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB5 },
> + { NPCM8XX_CLKDIV2, 16, 5, NPCM8XX_CLK_S_CLKOUT,
> + { .hw = &npcm8xx_muxes[8].hw }, CLK_DIVIDER_READ_ONLY, 0,
> + NPCM8XX_CLK_CLKOUT },
> + { NPCM8XX_CLKDIV2, 13, 3, NPCM8XX_CLK_S_GFX,
> + { .hw = &npcm8xx_muxes[7].hw }, CLK_DIVIDER_READ_ONLY, 0,
> + NPCM8XX_CLK_GFX },
> + { NPCM8XX_CLKDIV2, 8, 5, NPCM8XX_CLK_S_USB_BRIDGE,
> + { .hw = &npcm8xx_muxes[4].hw }, CLK_DIVIDER_READ_ONLY, 0,
> + NPCM8XX_CLK_SU },
> + { NPCM8XX_CLKDIV2, 4, 4, NPCM8XX_CLK_S_USB_HOST,
> + { .hw = &npcm8xx_muxes[4].hw }, CLK_DIVIDER_READ_ONLY, 0,
> + NPCM8XX_CLK_SU48 },
> + { NPCM8XX_CLKDIV2, 0, 4, NPCM8XX_CLK_S_SDHC,
> + { .hw = &npcm8xx_muxes[2].hw }, CLK_DIVIDER_READ_ONLY, 0,
> + NPCM8XX_CLK_SDHC },
> +
> + { NPCM8XX_CLKDIV3, 16, 8, NPCM8XX_CLK_S_SPI1,
> + { .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
> + CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPI1 },
> + { NPCM8XX_CLKDIV3, 11, 5, NPCM8XX_CLK_S_UART2,
> + { .hw = &npcm8xx_muxes[3].hw }, CLK_DIVIDER_READ_ONLY, 0,
> + NPCM8XX_CLK_UART2 },
> + { NPCM8XX_CLKDIV3, 6, 5, NPCM8XX_CLK_S_SPI0,
> + { .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
> + CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPI0 },
> + { NPCM8XX_CLKDIV3, 1, 5, NPCM8XX_CLK_S_SPIX,
> + { .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
> + CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPIX },
> +
> + { NPCM8XX_CLKDIV4, 28, 4, NPCM8XX_CLK_S_RG,
> + { .hw = &npcm8xx_muxes[11].hw }, CLK_DIVIDER_READ_ONLY, 0,
> + NPCM8XX_CLK_RG },
> + { NPCM8XX_CLKDIV4, 12, 4, NPCM8XX_CLK_S_RCP,
> + { .hw = &npcm8xx_muxes[12].hw }, CLK_DIVIDER_READ_ONLY, 0,
> + NPCM8XX_CLK_RCP },
> +
> + { NPCM8XX_THRTL_CNT, 0, 2, NPCM8XX_CLK_S_TH,
> + { .hw = &npcm8xx_muxes[0].hw },
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_TH },
> +};
> +
> +static unsigned long npcm8xx_clk_pll_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + struct npcm8xx_clk_pll *pll = to_npcm8xx_clk_pll(hw);
> + unsigned long fbdv, indv, otdv1, otdv2;
> + unsigned int val;
> + u64 ret;
> +
> + if (parent_rate == 0) {
> + pr_debug("%s: parent rate is zero\n", __func__);
> + return 0;
> + }
> +
> + val = readl_relaxed(pll->pllcon);
> +
> + indv = FIELD_GET(PLLCON_INDV, val);
> + fbdv = FIELD_GET(PLLCON_FBDV, val);
> + otdv1 = FIELD_GET(PLLCON_OTDV1, val);
> + otdv2 = FIELD_GET(PLLCON_OTDV2, val);
> +
> + ret = (u64)parent_rate * fbdv;
> + do_div(ret, indv * otdv1 * otdv2);
> +
> + return ret;
> +}
> +
> +static const struct clk_ops npcm8xx_clk_pll_ops = {
> + .recalc_rate = npcm8xx_clk_pll_recalc_rate,
> +};
> +
> +static struct clk_hw *
> +npcm8xx_clk_register_pll(struct device *dev, void __iomem *pllcon,
> + const char *name, const struct clk_parent_data *parent,
> + unsigned long flags)
> +{
> + struct npcm8xx_clk_pll *pll;
> + struct clk_init_data init = {};
> + int ret;
> +
> + pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
> + if (!pll)
> + return ERR_PTR(-ENOMEM);
> +
> + init.name = name;
> + init.ops = &npcm8xx_clk_pll_ops;
> + init.parent_data = parent;
> + init.num_parents = 1;
> + init.flags = flags;
> +
> + pll->pllcon = pllcon;
> + pll->hw.init = &init;
> +
> + ret = devm_clk_hw_register(dev, &pll->hw);
> + if (ret) {
> + kfree(pll);
> + return ERR_PTR(ret);
> + }
> +
> + return &pll->hw;
> +}
> +
> +static DEFINE_SPINLOCK(npcm8xx_clk_lock);
> +
> +static int npcm8xx_clk_probe(struct platform_device *pdev)
> +{
> + struct clk_hw_onecell_data *npcm8xx_clk_data;
> + struct device *dev = &pdev->dev;
> + void __iomem *clk_base;
> + struct resource *res;
> + struct clk_hw *hw;
> + unsigned int i;
> + int err;
> +
> + npcm8xx_clk_data = devm_kzalloc(dev, struct_size(npcm8xx_clk_data, hws,
> + NPCM8XX_NUM_CLOCKS),
> + GFP_KERNEL);
> + if (!npcm8xx_clk_data)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + clk_base = devm_ioremap(dev, res->start, resource_size(res));
> + if (!clk_base) {
> + dev_err(&pdev->dev, "Failed to remap I/O memory\n");
> + return -ENOMEM;
> + }
> +
> + npcm8xx_clk_data->num = NPCM8XX_NUM_CLOCKS;
> +
> + for (i = 0; i < NPCM8XX_NUM_CLOCKS; i++)
> + npcm8xx_clk_data->hws[i] = ERR_PTR(-EPROBE_DEFER);
> +
> + /* Register plls */
> + for (i = 0; i < ARRAY_SIZE(npcm8xx_pll_clks); i++) {
> + struct npcm8xx_pll_data *pll_clk = &npcm8xx_pll_clks[i];
> +
> + hw = npcm8xx_clk_register_pll(dev, clk_base + pll_clk->reg,
> + pll_clk->name, &pll_clk->parent,
> + pll_clk->flags);
> + if (IS_ERR(hw)) {
> + dev_err(dev, "npcm8xx_clk: Can't register pll\n");
> + return PTR_ERR(hw);
> + }
> + pll_clk->hw = *hw;
> + }
> +
> + /* Register fixed dividers */
> + hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_PLL1_DIV2,
> + NPCM8XX_CLK_S_PLL1, 0, 1, 2);
> + if (IS_ERR(hw)) {
> + dev_err(dev, "npcm8xx_clk: Can't register fixed div\n");
> + return PTR_ERR(hw);
> + }
> + hw_pll1_div2 = *hw;
> +
> + hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_PLL2_DIV2,
> + NPCM8XX_CLK_S_PLL2, 0, 1, 2);
> + if (IS_ERR(hw)) {
> + dev_err(dev, "npcm8xx_clk: Can't register pll2 div2\n");
> + return PTR_ERR(hw);
> + }
> + hw_pll2_div2 = *hw;
> +
> + hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_PLL_GFX_DIV2,
> + NPCM8XX_CLK_S_PLL_GFX, 0, 1, 2);
> + if (IS_ERR(hw)) {
> + dev_err(dev, "npcm8xx_clk: Can't register gfx div2\n");
> + return PTR_ERR(hw);
> + }
> + hw_gfx_div2 = *hw;
> +
> + /* Register muxes */
> + for (i = 0; i < ARRAY_SIZE(npcm8xx_muxes); i++) {
> + struct npcm8xx_clk_mux_data *mux_data = &npcm8xx_muxes[i];
> +
> + hw = devm_clk_hw_register_mux_parent_data_table(dev,
> + mux_data->name,
> + mux_data->parent_data,
> + mux_data->num_parents,
> + mux_data->flags,
> + clk_base + NPCM8XX_CLKSEL,
> + mux_data->shift,
> + mux_data->mask,
> + 0,
> + mux_data->table,
> + &npcm8xx_clk_lock);
> + if (IS_ERR(hw)) {
> + dev_err(dev, "npcm8xx_clk: Can't register mux\n");
> + return PTR_ERR(hw);
> + }
> + mux_data->hw = *hw;
> + }
> +
> + hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_PRE_CLK,
> + NPCM8XX_CLK_S_CPU_MUX, 0, 1, 2);
> + if (IS_ERR(hw)) {
> + dev_err(dev, "npcm8xx_clk: Can't register pre clk div2\n");
> + return PTR_ERR(hw);
> + }
> + hw_pre_clk = *hw;
> +
> + hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_AXI,
> + NPCM8XX_CLK_S_TH, 0, 1, 2);
> + if (IS_ERR(hw)) {
> + dev_err(dev, "npcm8xx_clk: Can't register axi div2\n");
> + return PTR_ERR(hw);
> + }
> + npcm8xx_clk_data->hws[NPCM8XX_CLK_AXI] = hw;
> +
> + hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_ATB,
> + NPCM8XX_CLK_S_AXI, 0, 1, 2);
> + if (IS_ERR(hw)) {
> + dev_err(dev, "npcm8xx_clk: Can't register atb div2\n");
> + return PTR_ERR(hw);
> + }
> + npcm8xx_clk_data->hws[NPCM8XX_CLK_ATB] = hw;
> +
> + /* Register clock dividers specified in npcm8xx_divs */
> + for (i = 0; i < ARRAY_SIZE(npcm8xx_divs); i++) {
> + const struct npcm8xx_clk_div_data *div_data = &npcm8xx_divs[i];
> +
> + hw = clk_hw_register_divider_parent_data(dev, div_data->name,
> + &div_data->parent_data,
> + div_data->flags,
> + clk_base + div_data->reg,
> + div_data->shift,
> + div_data->width,
> + div_data->clk_divider_flags,
> + &npcm8xx_clk_lock);
> + if (IS_ERR(hw)) {
> + dev_err(dev, "npcm8xx_clk: Can't register div table\n");
> + goto err_div_clk;
> + }
> +
> + if (div_data->onecell_idx >= 0)
> + npcm8xx_clk_data->hws[div_data->onecell_idx] = hw;
> + }
> +
> + err = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
> + npcm8xx_clk_data);
> + if (err) {
> + dev_err(dev, "unable to add clk provider\n");
> + hw = ERR_PTR(err);
> + goto err_div_clk;
> + }
> +
> + return err;
> +
> +err_div_clk:
> + while (i--)
> + if (npcm8xx_divs[i].onecell_idx >= 0)
> + clk_hw_unregister_divider(npcm8xx_clk_data->hws[npcm8xx_divs[i].onecell_idx]);
> +
> + return PTR_ERR(hw);
> +}
> +
> +static const struct of_device_id npcm8xx_clk_dt_ids[] = {
> + { .compatible = "nuvoton,npcm845-clk", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, npcm8xx_clk_dt_ids);
> +
> +static struct platform_driver npcm8xx_clk_driver = {
> + .probe = npcm8xx_clk_probe,
> + .driver = {
> + .name = "npcm8xx_clk",
> + .of_match_table = npcm8xx_clk_dt_ids,
> + },
> +};
> +
> +static int __init npcm8xx_clk_driver_init(void)
> +{
> + return platform_driver_register(&npcm8xx_clk_driver);
> +}
> +arch_initcall(npcm8xx_clk_driver_init);
> +
> +static void __exit npcm8xx_clk_exit(void)
> +{
> + platform_driver_unregister(&npcm8xx_clk_driver);
> +}
> +module_exit(npcm8xx_clk_exit);
> +
> +MODULE_DESCRIPTION("Clock driver for Nuvoton NPCM8XX BMC SoC");
> +MODULE_AUTHOR("Tomer Maimon <tomer.maimon@...oton.com>");
> +MODULE_LICENSE("GPL v2");
> +
> --
> 2.33.0
>
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