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Message-ID: <20230928194508.141138-1-tmaimon77@gmail.com>
Date: Thu, 28 Sep 2023 22:45:08 +0300
From: Tomer Maimon <tmaimon77@...il.com>
To: <mturquette@...libre.com>, <sboyd@...nel.org>,
<avifishman70@...il.com>, <tali.perry1@...il.com>,
<joel@....id.au>, <venture@...gle.com>, <yuenn@...gle.com>,
<benjaminfair@...gle.com>
CC: <openbmc@...ts.ozlabs.org>, <linux-clk@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, Tomer Maimon <tmaimon77@...il.com>
Subject: [PATCH RESEND v19] clk: npcm8xx: add clock controller
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>
---
Changes since version 18:
- NPCM8XX clock driver did not changed from version 18 only build and tested under kernel 6.6-rc1.
Changes since version 17:
- NPCM8XX clock driver did not changed from version 17 only build and tested under kernel 6.5-rc3.
Changes since version 16:
- NPCM8XX clock driver
- Using devm_kzalloc instead kzalloc.
- Remove unnecessary parenthesis.
- Modify incorrect spelling.
Changes since version 15:
- NPCM8XX clock driver
- Remove unused regs parameter from npcm8xx_pll_data structure.
- Using index and clk_hw parameters to set the clock parent in the clock structures.
Changes since version 14:
- NPCM8XX clock driver
- Remove unnecessary register definitions.
- Remove the internal reference clock, instead use the external DT reference clock.
- rearrange the driver.
- using .names parameter in DT to define clock (refclk).
Changes since version 13:
- NPCM8XX clock driver
- Remove unnecessary definitions and add module.h define
- Use in clk_parent_data struct.fw_name and .name.
- Add module_exit function.
- Add const to divider clock names.
- Add MODULE_DESCRIPTION and MODULE_LICENSE
Changes since version 12:
- NPCM8XX clock driver
- Use clk_parent_data in mux and div clock structure.
- Add const to mux tables.
- Using devm_clk_hw_register_fixed_rate function.
- use only .name clk_parent_data instead .name and .fw_name.
- Modify mask values in mux clocks.
Changes since version 11:
- NPCM8XX clock driver
- Modify Kconfig help.
- Modify loop variable to unsigned int.
Changes since version 11:
- NPCM8XX clock driver
- Modify Kconfig help.
- Modify loop variable to unsigned int.
Changes since version 10:
- NPCM8XX clock driver
- Fix const warning.
Changes since version 9:
- NPCM8XX clock driver
- Move configuration place.
- Using clk_parent_data instead of parent_name
- using devm_ioremap instead of ioremap. deeply sorry, I know we had
a long discussion on what should the driver use, from other examples
(also in other clock drivers) I see the combination of
platform_get_resource and devm_ioremap are commonly used and it answer
the reset and clock needs.
Changes since version 8:
- NPCM8XX clock driver
- Move configuration place.
- Add space before and aftre '{' '}'.
- Handle devm_of_clk_add_hw_provider function error.
Changes since version 7:
- NPCM8XX clock driver
- The clock and reset registers using the same memory region,
due to it the clock driver should claim the ioremap directly
without checking the memory region.
Changes since version 5:
- NPCM8XX clock driver
- Remove refclk if devm_of_clk_add_hw_provider function failed.
Changes since version 4:
- NPCM8XX clock driver
- Use the same quote in the dt-binding file.
Changes since version 3:
- NPCM8XX clock driver
- Rename NPCM8xx clock dt-binding header file.
- Remove unused structures.
- Improve Handling the clocks registration.
Changes since version 2:
- NPCM8XX clock driver
- Add debug new line.
- Add 25M fixed rate clock.
- Remove unused clocks and clock name from dt-binding.
Changes since version 1:
- NPCM8XX clock driver
- Modify dt-binding.
- Remove unsed definition and include.
- Include alphabetically.
- Use clock devm.
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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