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Subject[PATCH v9 04/16] clk: npcm8xx: add clock controller
Date
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@gmail.com>
---
drivers/clk/Kconfig | 6 +
drivers/clk/Makefile | 1 +
drivers/clk/clk-npcm8xx.c | 610 ++++++++++++++++++++++++++++++++++++++
3 files changed, 617 insertions(+)
create mode 100644 drivers/clk/clk-npcm8xx.c

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 48f8f4221e21..d2b58edbbe05 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -333,6 +333,12 @@ config COMMON_CLK_NXP
help
Support for clock providers on NXP platforms.

+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.
+
config COMMON_CLK_PALMAS
tristate "Clock driver for TI Palmas devices"
depends on MFD_PALMAS
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d5db170d38d2..b0ec1184a744 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -49,6 +49,7 @@ 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-$(CONFIG_COMMON_CLK_OXNAS) += clk-oxnas.o
obj-$(CONFIG_COMMON_CLK_PALMAS) += clk-palmas.o
diff --git a/drivers/clk/clk-npcm8xx.c b/drivers/clk/clk-npcm8xx.c
new file mode 100644
index 000000000000..2533958d9918
--- /dev/null
+++ b/drivers/clk/clk-npcm8xx.c
@@ -0,0 +1,610 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Nuvoton NPCM8xx Clock Generator
+ * All the clocks are initialized by the bootloader, so this driver allow only
+ * reading of current settings directly from the hardware.
+ *
+ * Copyright (C) 2020 Nuvoton Technologies
+ * Author: Tomer Maimon <tomer.maimon@nuvoton.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/clock/nuvoton,npcm845-clk.h>
+
+#define NPCM8XX_REF_CLK 25000000
+
+struct npcm8xx_clk_pll {
+ struct clk_hw hw;
+ void __iomem *pllcon;
+ u8 flags;
+};
+
+#define to_npcm8xx_clk_pll(_hw) container_of(_hw, struct npcm8xx_clk_pll, hw)
+
+#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)
+
+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 char *parent_name,
+ unsigned long flags)
+{
+ struct npcm8xx_clk_pll *pll;
+ struct clk_init_data init;
+ struct clk_hw *hw;
+ int ret;
+
+ pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
+ if (!pll)
+ return ERR_PTR(-ENOMEM);
+
+ pr_debug("%s reg, name=%s, p=%s\n", __func__, name, parent_name);
+
+ init.name = name;
+ init.ops = &npcm8xx_clk_pll_ops;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+ init.flags = flags;
+
+ pll->pllcon = pllcon;
+ pll->hw.init = &init;
+
+ hw = &pll->hw;
+
+ ret = devm_clk_hw_register(dev, hw);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return hw;
+}
+
+#define NPCM8XX_CLKEN1 (0x00)
+#define NPCM8XX_CLKEN2 (0x28)
+#define NPCM8XX_CLKEN3 (0x30)
+#define NPCM8XX_CLKEN4 (0x70)
+#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_SWRSTR (0x14)
+#define NPCM8XX_IRQWAKECON (0x18)
+#define NPCM8XX_IRQWAKEFLAG (0x1C)
+#define NPCM8XX_IPSRST1 (0x20)
+#define NPCM8XX_IPSRST2 (0x24)
+#define NPCM8XX_IPSRST3 (0x34)
+#define NPCM8XX_WD0RCR (0x38)
+#define NPCM8XX_WD1RCR (0x3C)
+#define NPCM8XX_WD2RCR (0x40)
+#define NPCM8XX_SWRSTC1 (0x44)
+#define NPCM8XX_SWRSTC2 (0x48)
+#define NPCM8XX_SWRSTC3 (0x4C)
+#define NPCM8XX_SWRSTC4 (0x50)
+#define NPCM8XX_CORSTC (0x5C)
+#define NPCM8XX_PLLCONG (0x60)
+#define NPCM8XX_AHBCKFI (0x64)
+#define NPCM8XX_SECCNT (0x68)
+#define NPCM8XX_CNTR25M (0x6C)
+#define NPCM8XX_THRTL_CNT (0xC0)
+
+struct npcm8xx_clk_mux_data {
+ u8 shift;
+ u8 mask;
+ u32 *table;
+ const char *name;
+ const char * const *parent_names;
+ u8 num_parents;
+ unsigned long flags;
+ /*
+ * If this clock is exported via DT, set onecell_idx to constant
+ * defined in include/dt-bindings/clock/nuvoton, NPCM8XX-clock.h for
+ * this specific clock. Otherwise, set to -1.
+ */
+ int onecell_idx;
+};
+
+struct npcm8xx_clk_div_data {
+ u32 reg;
+ u8 shift;
+ u8 width;
+ const char *name;
+ const char *parent_name;
+ u8 clk_divider_flags;
+ unsigned long flags;
+ /*
+ * If this clock is exported via DT, set onecell_idx to constant
+ * defined in include/dt-bindings/clock/nuvoton, NPCM8XX-clock.h for
+ * this specific clock. Otherwise, set to -1.
+ */
+ int onecell_idx;
+};
+
+struct npcm8xx_clk_pll_data {
+ u32 reg;
+ const char *name;
+ const char *parent_name;
+ unsigned long flags;
+ /*
+ * If this clock is exported via DT, set onecell_idx to constant
+ * defined in include/dt-bindings/clock/nuvoton, NPCM8XX-clock.h for
+ * this specific clock. Otherwise, set to -1.
+ */
+ int onecell_idx;
+};
+
+/*
+ * Single copy of strings used to refer to clocks within this driver indexed by
+ * above enum.
+ */
+#define NPCM8XX_CLK_S_REFCLK "refclk"
+#define NPCM8XX_CLK_S_SYSBYPCK "sysbypck"
+#define NPCM8XX_CLK_S_MCBYPCK "mcbypck"
+#define NPCM8XX_CLK_S_PLL0 "pll0"
+#define NPCM8XX_CLK_S_PLL1 "pll1"
+#define NPCM8XX_CLK_S_PLL1_DIV2 "pll1_div2"
+#define NPCM8XX_CLK_S_PLL2 "pll2"
+#define NPCM8XX_CLK_S_PLL_GFX "pll_gfx"
+#define NPCM8XX_CLK_S_PLL2_DIV2 "pll2_div2"
+#define NPCM8XX_CLK_S_PIX_MUX "gfx_pixel"
+#define NPCM8XX_CLK_S_MC_MUX "mc_phy"
+#define NPCM8XX_CLK_S_CPU_MUX "cpu" /* AKA system clock */
+#define NPCM8XX_CLK_S_MC "mc"
+#define NPCM8XX_CLK_S_AXI "axi" /* AKA CLK2 */
+#define NPCM8XX_CLK_S_AHB "ahb" /* AKA CLK4 */
+#define NPCM8XX_CLK_S_CLKOUT_MUX "clkout_mux"
+#define NPCM8XX_CLK_S_UART_MUX "uart_mux"
+#define NPCM8XX_CLK_S_SD_MUX "sd_mux"
+#define NPCM8XX_CLK_S_GFXM_MUX "gfxm_mux"
+#define NPCM8XX_CLK_S_SU_MUX "serial_usb_mux"
+#define NPCM8XX_CLK_S_DVC_MUX "dvc_mux"
+#define NPCM8XX_CLK_S_GFX_MUX "gfx_mux"
+#define NPCM8XX_CLK_S_ADC_MUX "adc_mux"
+#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_MUX "rg_mux"
+#define NPCM8XX_CLK_S_RCP_MUX "rcp_mux"
+#define NPCM8XX_CLK_S_RG "rg"
+#define NPCM8XX_CLK_S_RCP "rcp"
+
+static u32 pll_mux_table[] = {0, 1, 2, 3};
+static const char * const pll_mux_parents[] = {
+ NPCM8XX_CLK_S_PLL0,
+ NPCM8XX_CLK_S_PLL1,
+ NPCM8XX_CLK_S_REFCLK,
+ NPCM8XX_CLK_S_PLL2_DIV2,
+};
+
+static u32 cpuck_mux_table[] = {0, 1, 2, 3, 7};
+static const char * const cpuck_mux_parents[] = {
+ NPCM8XX_CLK_S_PLL0,
+ NPCM8XX_CLK_S_PLL1,
+ NPCM8XX_CLK_S_REFCLK,
+ NPCM8XX_CLK_S_SYSBYPCK,
+ NPCM8XX_CLK_S_PLL2,
+};
+
+static u32 pixcksel_mux_table[] = {0, 2};
+static const char * const pixcksel_mux_parents[] = {
+ NPCM8XX_CLK_S_PLL_GFX,
+ NPCM8XX_CLK_S_REFCLK,
+};
+
+static u32 sucksel_mux_table[] = {2, 3};
+static const char * const sucksel_mux_parents[] = {
+ NPCM8XX_CLK_S_REFCLK,
+ NPCM8XX_CLK_S_PLL2_DIV2,
+};
+
+static u32 mccksel_mux_table[] = {0, 2, 3};
+static const char * const mccksel_mux_parents[] = {
+ NPCM8XX_CLK_S_PLL1_DIV2,
+ NPCM8XX_CLK_S_REFCLK,
+ NPCM8XX_CLK_S_MCBYPCK,
+};
+
+static u32 clkoutsel_mux_table[] = {0, 1, 2, 3, 4};
+static const char * const clkoutsel_mux_parents[] = {
+ NPCM8XX_CLK_S_PLL0,
+ NPCM8XX_CLK_S_PLL1,
+ NPCM8XX_CLK_S_REFCLK,
+ NPCM8XX_CLK_S_PLL_GFX, // divided by 2
+ NPCM8XX_CLK_S_PLL2_DIV2,
+};
+
+static u32 gfxmsel_mux_table[] = {2, 3};
+static const char * const gfxmsel_mux_parents[] = {
+ NPCM8XX_CLK_S_REFCLK,
+ NPCM8XX_CLK_S_PLL2_DIV2,
+};
+
+static u32 dvcssel_mux_table[] = {2, 3};
+static const char * const dvcssel_mux_parents[] = {
+ NPCM8XX_CLK_S_REFCLK,
+ NPCM8XX_CLK_S_PLL2,
+};
+
+static const struct npcm8xx_clk_pll_data npcm8xx_plls[] = {
+ { NPCM8XX_PLLCON0, NPCM8XX_CLK_S_PLL0, NPCM8XX_CLK_S_REFCLK, 0, -1 },
+ { NPCM8XX_PLLCON1, NPCM8XX_CLK_S_PLL1, NPCM8XX_CLK_S_REFCLK, 0, -1 },
+ { NPCM8XX_PLLCON2, NPCM8XX_CLK_S_PLL2, NPCM8XX_CLK_S_REFCLK, 0, -1 },
+ { NPCM8XX_PLLCONG, NPCM8XX_CLK_S_PLL_GFX, NPCM8XX_CLK_S_REFCLK, 0, -1 },
+};
+
+static const struct npcm8xx_clk_mux_data npcm8xx_muxes[] = {
+ { 0, GENMASK(1, 0), cpuck_mux_table, NPCM8XX_CLK_S_CPU_MUX,
+ cpuck_mux_parents, ARRAY_SIZE(cpuck_mux_parents), CLK_IS_CRITICAL,
+ NPCM8XX_CLK_CPU },
+
+ { 4, GENMASK(1, 0), pixcksel_mux_table, NPCM8XX_CLK_S_PIX_MUX,
+ pixcksel_mux_parents, ARRAY_SIZE(pixcksel_mux_parents), 0,
+ NPCM8XX_CLK_GFX_PIXEL },
+
+ { 6, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_SD_MUX,
+ pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1 },
+
+ { 8, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_UART_MUX,
+ pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1 },
+
+ { 10, GENMASK(1, 0), sucksel_mux_table, NPCM8XX_CLK_S_SU_MUX,
+ sucksel_mux_parents, ARRAY_SIZE(sucksel_mux_parents), 0, -1 },
+
+ { 12, GENMASK(1, 0), mccksel_mux_table, NPCM8XX_CLK_S_MC_MUX,
+ mccksel_mux_parents, ARRAY_SIZE(mccksel_mux_parents), 0, -1 },
+
+ { 14, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_ADC_MUX,
+ pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1 },
+
+ { 16, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_GFX_MUX,
+ pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1 },
+
+ { 18, GENMASK(2, 0), clkoutsel_mux_table, NPCM8XX_CLK_S_CLKOUT_MUX,
+ clkoutsel_mux_parents, ARRAY_SIZE(clkoutsel_mux_parents), 0, -1 },
+
+ { 21, GENMASK(1, 0), gfxmsel_mux_table, NPCM8XX_CLK_S_GFXM_MUX,
+ gfxmsel_mux_parents, ARRAY_SIZE(gfxmsel_mux_parents), 0, -1 },
+
+ { 23, GENMASK(1, 0), dvcssel_mux_table, NPCM8XX_CLK_S_DVC_MUX,
+ dvcssel_mux_parents, ARRAY_SIZE(dvcssel_mux_parents), 0, -1 },
+
+ { 25, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_RG_MUX,
+ pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1 },
+
+ { 27, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_RCP_MUX,
+ pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1 },
+};
+
+/* configurable dividers: */
+static const struct npcm8xx_clk_div_data npcm8xx_divs[] = {
+ { NPCM8XX_CLKDIV1, 28, 3, NPCM8XX_CLK_S_ADC, NPCM8XX_CLK_S_PRE_ADC,
+ CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
+ NPCM8XX_CLK_ADC },
+ /* bit 30-28 ADCCKDIV*/
+ { NPCM8XX_CLKDIV1, 26, 2, NPCM8XX_CLK_S_AHB, NPCM8XX_CLK_S_PRE_CLK,
+ CLK_DIVIDER_READ_ONLY, CLK_IS_CRITICAL, NPCM8XX_CLK_AHB },
+ /* bit 28-26 CLK4DIV*/
+ { NPCM8XX_CLKDIV1, 21, 5, NPCM8XX_CLK_S_PRE_ADC,
+ NPCM8XX_CLK_S_ADC_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_PRE_ADC },
+ /* bit 25-21 PRE-ADCCKDIV*/
+ { NPCM8XX_CLKDIV1, 16, 5, NPCM8XX_CLK_S_UART,
+ NPCM8XX_CLK_S_UART_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_UART },
+ /* bit 20-16 UARTDIV*/
+ { NPCM8XX_CLKDIV1, 11, 5, NPCM8XX_CLK_S_MMC,
+ NPCM8XX_CLK_S_SD_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_MMC },
+ /* bit 15-11 MMCCKDIV*/
+ { NPCM8XX_CLKDIV1, 6, 5, NPCM8XX_CLK_S_SPI3,
+ NPCM8XX_CLK_S_AHB, 0, 0, NPCM8XX_CLK_SPI3 },
+ /* bit 10-6 AHB3CKDIV*/
+ { NPCM8XX_CLKDIV1, 2, 4, NPCM8XX_CLK_S_PCI,
+ NPCM8XX_CLK_S_GFX_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_PCI },
+ /* bit 5-2 PCICKDIV*/
+
+ { NPCM8XX_CLKDIV2, 30, 2, NPCM8XX_CLK_S_APB4, NPCM8XX_CLK_S_AHB,
+ CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
+ NPCM8XX_CLK_APB4 },
+ /* bit 31-30 APB4CKDIV*/
+ { NPCM8XX_CLKDIV2, 28, 2, NPCM8XX_CLK_S_APB3, NPCM8XX_CLK_S_AHB,
+ CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
+ NPCM8XX_CLK_APB3 },
+ /* bit 29-28 APB3CKDIV*/
+ { NPCM8XX_CLKDIV2, 26, 2, NPCM8XX_CLK_S_APB2, NPCM8XX_CLK_S_AHB,
+ CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
+ NPCM8XX_CLK_APB2 },
+ /* bit 28-26 APB2CKDIV*/
+ { NPCM8XX_CLKDIV2, 24, 2, NPCM8XX_CLK_S_APB1, NPCM8XX_CLK_S_AHB,
+ CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
+ NPCM8XX_CLK_APB1 },
+ /* bit 25-24 APB1CKDIV*/
+ { NPCM8XX_CLKDIV2, 22, 2, NPCM8XX_CLK_S_APB5, NPCM8XX_CLK_S_AHB,
+ CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
+ NPCM8XX_CLK_APB5 },
+ /* bit 23-22 APB5CKDIV*/
+ { NPCM8XX_CLKDIV2, 16, 5, NPCM8XX_CLK_S_CLKOUT, NPCM8XX_CLK_S_CLKOUT_MUX,
+ CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_CLKOUT },
+ /* bit 20-16 CLKOUTDIV*/
+ { NPCM8XX_CLKDIV2, 13, 3, NPCM8XX_CLK_S_GFX, NPCM8XX_CLK_S_GFX_MUX,
+ CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_GFX },
+ /* bit 15-13 GFXCKDIV*/
+ { NPCM8XX_CLKDIV2, 8, 5, NPCM8XX_CLK_S_USB_BRIDGE, NPCM8XX_CLK_S_SU_MUX,
+ CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SU },
+ /* bit 12-8 SUCKDIV*/
+ { NPCM8XX_CLKDIV2, 4, 4, NPCM8XX_CLK_S_USB_HOST, NPCM8XX_CLK_S_SU_MUX,
+ CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SU48 },
+ /* bit 8-4 SU48CKDIV*/
+ { NPCM8XX_CLKDIV2, 0, 4, NPCM8XX_CLK_S_SDHC,
+ NPCM8XX_CLK_S_SD_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SDHC }
+ ,/* bit 3-0 SD1CKDIV*/
+
+ { NPCM8XX_CLKDIV3, 16, 8, NPCM8XX_CLK_S_SPI1,
+ NPCM8XX_CLK_S_AHB, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPI1 },
+ /* bit 23-16 SPI1CKDV*/
+ { NPCM8XX_CLKDIV3, 11, 5, NPCM8XX_CLK_S_UART2,
+ NPCM8XX_CLK_S_UART_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_UART2 },
+ /* bit 15-11 UARTDIV2*/
+ { NPCM8XX_CLKDIV3, 6, 5, NPCM8XX_CLK_S_SPI0,
+ NPCM8XX_CLK_S_AHB, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPI0 },
+ /* bit 10-6 SPI0CKDV*/
+ { NPCM8XX_CLKDIV3, 1, 5, NPCM8XX_CLK_S_SPIX,
+ NPCM8XX_CLK_S_AHB, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPIX },
+ /* bit 5-1 SPIXCKDV*/
+
+ { NPCM8XX_CLKDIV4, 28, 4, NPCM8XX_CLK_S_RG, NPCM8XX_CLK_S_RG_MUX,
+ CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_RG },
+ /* bit 31-28 RGREFDIV*/
+ { NPCM8XX_CLKDIV4, 12, 4, NPCM8XX_CLK_S_RCP, NPCM8XX_CLK_S_RCP_MUX,
+ CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_RCP },
+ /* bit 15-12 RCPREFDIV*/
+ { NPCM8XX_THRTL_CNT, 0, 2, NPCM8XX_CLK_S_TH, NPCM8XX_CLK_S_CPU_MUX,
+ CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_TH },
+ /* bit 1-0 TH_DIV*/
+};
+
+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;
+ struct device_node *np = dev->of_node;
+ void __iomem *clk_base;
+ struct resource res;
+ struct clk_hw *hw;
+ int i, err;
+
+ npcm8xx_clk_data = devm_kzalloc(dev, struct_size(npcm8xx_clk_data, hws,
+ NPCM8XX_NUM_CLOCKS),
+ GFP_KERNEL);
+ if (!npcm8xx_clk_data)
+ return -ENOMEM;
+
+ err = of_address_to_resource(np, 0, &res);
+ if (err) {
+ dev_err(dev, "Failed to get resource, ret %d\n", err);
+ return err;
+ }
+
+ clk_base = ioremap(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);
+
+ /* Reference 25MHz clock */
+ hw = clk_hw_register_fixed_rate(dev, "refclk", NULL, 0, NPCM8XX_REF_CLK);
+ if (IS_ERR(hw))
+ return PTR_ERR(hw);
+ npcm8xx_clk_data->hws[NPCM8XX_CLK_REFCLK] = hw;
+
+ /* Register plls */
+ for (i = 0; i < ARRAY_SIZE(npcm8xx_plls); i++) {
+ const struct npcm8xx_clk_pll_data *pll_data = &npcm8xx_plls[i];
+
+ hw = npcm8xx_clk_register_pll(dev, clk_base + pll_data->reg,
+ pll_data->name,
+ pll_data->parent_name,
+ pll_data->flags);
+ if (IS_ERR(hw)) {
+ dev_err(dev, "npcm8xx_clk: Can't register pll\n");
+ goto unregister_refclk;
+ }
+
+ if (pll_data->onecell_idx >= 0)
+ npcm8xx_clk_data->hws[pll_data->onecell_idx] = 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");
+ goto unregister_refclk;
+ }
+
+ 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 pll div2\n");
+ goto unregister_refclk;
+ }
+
+ 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 ckclk div2\n");
+ goto unregister_refclk;
+ }
+
+ 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");
+ goto unregister_refclk;
+ }
+
+ 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");
+ goto unregister_refclk;
+ }
+
+ /* 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 = devm_clk_hw_register_divider(dev, div_data->name,
+ div_data->parent_name,
+ 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 unregister_refclk;
+ }
+
+ if (div_data->onecell_idx >= 0)
+ npcm8xx_clk_data->hws[div_data->onecell_idx] = hw;
+ }
+
+ /* Register muxes */
+ for (i = 0; i < ARRAY_SIZE(npcm8xx_muxes); i++) {
+ const struct npcm8xx_clk_mux_data *mux_data = &npcm8xx_muxes[i];
+
+ hw = clk_hw_register_mux_table(dev, mux_data->name,
+ mux_data->parent_names,
+ 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");
+ goto err_mux_clk;
+ }
+
+ if (mux_data->onecell_idx >= 0)
+ npcm8xx_clk_data->hws[mux_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_mux_clk;
+ }
+
+ return err;
+
+err_mux_clk:
+ while (i--) {
+ if (npcm8xx_muxes[i].onecell_idx >= 0)
+ clk_hw_unregister_mux(npcm8xx_clk_data->hws[npcm8xx_muxes[i].onecell_idx]);
+ }
+unregister_refclk:
+ clk_hw_unregister(npcm8xx_clk_data->hws[NPCM8XX_CLK_REFCLK]);
+ return PTR_ERR(hw);
+}
+
+static const struct of_device_id npcm8xx_clk_dt_ids[] = {
+ { .compatible = "nuvoton,npcm845-clk", },
+ { }
+};
+
+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);
+
--
2.33.0
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  Last update: 2022-07-17 11:17    [W:0.062 / U:0.064 seconds]
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