This patch adds a clock driver for MediaTek MT7621 SoC. This driver provides clock gate control as well as getting clock frequency for CPU/SYS/XTAL and some peripherals.
Reviewed-by: Sean Anderson seanga2@gmail.com Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- v6 changes: use FIELD_GET for register fields instead of shift opertations v5 changes: Remove the use of common.h Use GENMASK and BITS for register fields Add request() to check clk id Adjust probe() due to clkctrl node becomes a subnode of sysc Use regmap api to read memc registers v4 changes: none v3 changes: update clock definitions to match upstream kernel v2 changes: none --- drivers/clk/mtmips/Makefile | 1 + drivers/clk/mtmips/clk-mt7621.c | 288 +++++++++++++++++++++++++ include/dt-bindings/clock/mt7621-clk.h | 46 ++++ 3 files changed, 335 insertions(+) create mode 100644 drivers/clk/mtmips/clk-mt7621.c create mode 100644 include/dt-bindings/clock/mt7621-clk.h
diff --git a/drivers/clk/mtmips/Makefile b/drivers/clk/mtmips/Makefile index 732e7f2545..ee8b5afe87 100644 --- a/drivers/clk/mtmips/Makefile +++ b/drivers/clk/mtmips/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_SOC_MT7620) += clk-mt7620.o +obj-$(CONFIG_SOC_MT7621) += clk-mt7621.o obj-$(CONFIG_SOC_MT7628) += clk-mt7628.o diff --git a/drivers/clk/mtmips/clk-mt7621.c b/drivers/clk/mtmips/clk-mt7621.c new file mode 100644 index 0000000000..03363b70d7 --- /dev/null +++ b/drivers/clk/mtmips/clk-mt7621.c @@ -0,0 +1,288 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2022 MediaTek Inc. All rights reserved. + * + * Author: Weijie Gao weijie.gao@mediatek.com + */ + +#include <clk-uclass.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <regmap.h> +#include <syscon.h> +#include <dt-bindings/clock/mt7621-clk.h> +#include <linux/io.h> +#include <linux/bitops.h> +#include <linux/bitfield.h> + +#define SYSC_MAP_SIZE 0x100 +#define MEMC_MAP_SIZE 0x1000 + +/* SYSC */ +#define SYSCFG0_REG 0x10 +#define XTAL_MODE_SEL GENMASK(8, 6) + +#define CLKCFG0_REG 0x2c +#define CPU_CLK_SEL GENMASK(31, 30) +#define PERI_CLK_SEL BIT(4) + +#define CLKCFG1_REG 0x30 + +#define CUR_CLK_STS_REG 0x44 +#define CUR_CPU_FDIV GENMASK(12, 8) +#define CUR_CPU_FFRAC GENMASK(4, 0) + +/* MEMC */ +#define MEMPLL1_REG 0x0604 +#define RG_MEPL_DIV2_SEL GENMASK(2, 1) + +#define MEMPLL6_REG 0x0618 +#define MEMPLL18_REG 0x0648 +#define RG_MEPL_PREDIV GENMASK(13, 12) +#define RG_MEPL_FBDIV GENMASK(10, 4) + +/* Fixed 500M clock */ +#define GMPLL_CLK 500000000 + +struct mt7621_clk_priv { + void __iomem *sysc_base; + int cpu_clk; + int ddr_clk; + int sys_clk; + int xtal_clk; +}; + +enum mt7621_clk_src { + CLK_SRC_CPU, + CLK_SRC_DDR, + CLK_SRC_SYS, + CLK_SRC_XTAL, + CLK_SRC_PERI, + CLK_SRC_125M, + CLK_SRC_150M, + CLK_SRC_250M, + CLK_SRC_270M, + + __CLK_SRC_MAX +}; + +struct mt7621_clk_map { + u32 cgbit; + enum mt7621_clk_src clksrc; +}; + +#define CLK_MAP(_id, _cg, _src) \ + [_id] = { .cgbit = (_cg), .clksrc = (_src) } + +#define CLK_MAP_SRC(_id, _src) \ + [_id] = { .cgbit = UINT32_MAX, .clksrc = (_src) } + +static const struct mt7621_clk_map mt7621_clk_mappings[] = { + CLK_MAP_SRC(MT7621_CLK_XTAL, CLK_SRC_XTAL), + CLK_MAP_SRC(MT7621_CLK_CPU, CLK_SRC_CPU), + CLK_MAP_SRC(MT7621_CLK_BUS, CLK_SRC_SYS), + CLK_MAP_SRC(MT7621_CLK_50M, CLK_SRC_PERI), + CLK_MAP_SRC(MT7621_CLK_125M, CLK_SRC_125M), + CLK_MAP_SRC(MT7621_CLK_150M, CLK_SRC_150M), + CLK_MAP_SRC(MT7621_CLK_250M, CLK_SRC_250M), + CLK_MAP_SRC(MT7621_CLK_270M, CLK_SRC_270M), + + CLK_MAP(MT7621_CLK_HSDMA, 5, CLK_SRC_150M), + CLK_MAP(MT7621_CLK_FE, 6, CLK_SRC_250M), + CLK_MAP(MT7621_CLK_SP_DIVTX, 7, CLK_SRC_270M), + CLK_MAP(MT7621_CLK_TIMER, 8, CLK_SRC_PERI), + CLK_MAP(MT7621_CLK_PCM, 11, CLK_SRC_270M), + CLK_MAP(MT7621_CLK_PIO, 13, CLK_SRC_PERI), + CLK_MAP(MT7621_CLK_GDMA, 14, CLK_SRC_SYS), + CLK_MAP(MT7621_CLK_NAND, 15, CLK_SRC_125M), + CLK_MAP(MT7621_CLK_I2C, 16, CLK_SRC_PERI), + CLK_MAP(MT7621_CLK_I2S, 17, CLK_SRC_270M), + CLK_MAP(MT7621_CLK_SPI, 18, CLK_SRC_SYS), + CLK_MAP(MT7621_CLK_UART1, 19, CLK_SRC_PERI), + CLK_MAP(MT7621_CLK_UART2, 20, CLK_SRC_PERI), + CLK_MAP(MT7621_CLK_UART3, 21, CLK_SRC_PERI), + CLK_MAP(MT7621_CLK_ETH, 23, CLK_SRC_PERI), + CLK_MAP(MT7621_CLK_PCIE0, 24, CLK_SRC_125M), + CLK_MAP(MT7621_CLK_PCIE1, 25, CLK_SRC_125M), + CLK_MAP(MT7621_CLK_PCIE2, 26, CLK_SRC_125M), + CLK_MAP(MT7621_CLK_CRYPTO, 29, CLK_SRC_250M), + CLK_MAP(MT7621_CLK_SHXC, 30, CLK_SRC_PERI), + + CLK_MAP_SRC(MT7621_CLK_MAX, __CLK_SRC_MAX), + + CLK_MAP_SRC(MT7621_CLK_DDR, CLK_SRC_DDR), +}; + +static ulong mt7621_clk_get_rate(struct clk *clk) +{ + struct mt7621_clk_priv *priv = dev_get_priv(clk->dev); + u32 val; + + switch (mt7621_clk_mappings[clk->id].clksrc) { + case CLK_SRC_CPU: + return priv->cpu_clk; + case CLK_SRC_DDR: + return priv->ddr_clk; + case CLK_SRC_SYS: + return priv->sys_clk; + case CLK_SRC_XTAL: + return priv->xtal_clk; + case CLK_SRC_PERI: + val = readl(priv->sysc_base + CLKCFG0_REG); + if (val & PERI_CLK_SEL) + return priv->xtal_clk; + else + return GMPLL_CLK / 10; + case CLK_SRC_125M: + return 125000000; + case CLK_SRC_150M: + return 150000000; + case CLK_SRC_250M: + return 250000000; + case CLK_SRC_270M: + return 270000000; + default: + return 0; + } +} + +static int mt7621_clk_enable(struct clk *clk) +{ + struct mt7621_clk_priv *priv = dev_get_priv(clk->dev); + u32 cgbit; + + cgbit = mt7621_clk_mappings[clk->id].cgbit; + if (cgbit == UINT32_MAX) + return -ENOSYS; + + setbits_32(priv->sysc_base + CLKCFG1_REG, BIT(cgbit)); + + return 0; +} + +static int mt7621_clk_disable(struct clk *clk) +{ + struct mt7621_clk_priv *priv = dev_get_priv(clk->dev); + u32 cgbit; + + cgbit = mt7621_clk_mappings[clk->id].cgbit; + if (cgbit == UINT32_MAX) + return -ENOSYS; + + clrbits_32(priv->sysc_base + CLKCFG1_REG, BIT(cgbit)); + + return 0; +} + +static int mt7621_clk_request(struct clk *clk) +{ + if (clk->id >= ARRAY_SIZE(mt7621_clk_mappings)) + return -EINVAL; + return 0; +} + +const struct clk_ops mt7621_clk_ops = { + .request = mt7621_clk_request, + .enable = mt7621_clk_enable, + .disable = mt7621_clk_disable, + .get_rate = mt7621_clk_get_rate, +}; + +static void mt7621_get_clocks(struct mt7621_clk_priv *priv, struct regmap *memc) +{ + u32 bs, xtal_sel, clkcfg0, cur_clk, mempll, dividx, fb; + u32 xtal_clk, xtal_div, ffiv, ffrac, cpu_clk, ddr_clk; + static const u32 xtal_div_tbl[] = {0, 1, 2, 2}; + + bs = readl(priv->sysc_base + SYSCFG0_REG); + clkcfg0 = readl(priv->sysc_base + CLKCFG0_REG); + cur_clk = readl(priv->sysc_base + CUR_CLK_STS_REG); + + xtal_sel = FIELD_GET(XTAL_MODE_SEL, bs); + + if (xtal_sel <= 2) + xtal_clk = 20 * 1000 * 1000; + else if (xtal_sel <= 5) + xtal_clk = 40 * 1000 * 1000; + else + xtal_clk = 25 * 1000 * 1000; + + switch (FIELD_GET(CPU_CLK_SEL, clkcfg0)) { + case 0: + cpu_clk = GMPLL_CLK; + break; + case 1: + regmap_read(memc, MEMPLL18_REG, &mempll); + dividx = FIELD_GET(RG_MEPL_PREDIV, mempll); + fb = FIELD_GET(RG_MEPL_FBDIV, mempll); + xtal_div = 1 << xtal_div_tbl[dividx]; + cpu_clk = (fb + 1) * xtal_clk / xtal_div; + break; + default: + cpu_clk = xtal_clk; + } + + ffiv = FIELD_GET(CUR_CPU_FDIV, cur_clk); + ffrac = FIELD_GET(CUR_CPU_FFRAC, cur_clk); + cpu_clk = cpu_clk / ffiv * ffrac; + + regmap_read(memc, MEMPLL6_REG, &mempll); + dividx = FIELD_GET(RG_MEPL_PREDIV, mempll); + fb = FIELD_GET(RG_MEPL_FBDIV, mempll); + xtal_div = 1 << xtal_div_tbl[dividx]; + ddr_clk = fb * xtal_clk / xtal_div; + + regmap_read(memc, MEMPLL1_REG, &bs); + if (!FIELD_GET(RG_MEPL_DIV2_SEL, bs)) + ddr_clk *= 2; + + priv->cpu_clk = cpu_clk; + priv->sys_clk = cpu_clk / 4; + priv->ddr_clk = ddr_clk; + priv->xtal_clk = xtal_clk; +} + +static int mt7621_clk_probe(struct udevice *dev) +{ + struct mt7621_clk_priv *priv = dev_get_priv(dev); + struct ofnode_phandle_args args; + struct udevice *pdev; + struct regmap *memc; + int ret; + + pdev = dev_get_parent(dev); + if (!pdev) + return -ENODEV; + + priv->sysc_base = dev_remap_addr(pdev); + if (!priv->sysc_base) + return -EINVAL; + + /* get corresponding memc phandle */ + ret = dev_read_phandle_with_args(dev, "mediatek,memc", NULL, 0, 0, + &args); + if (ret) + return ret; + + memc = syscon_node_to_regmap(args.node); + if (IS_ERR(memc)) + return PTR_ERR(memc); + + mt7621_get_clocks(priv, memc); + + return 0; +} + +static const struct udevice_id mt7621_clk_ids[] = { + { .compatible = "mediatek,mt7621-clk" }, + { } +}; + +U_BOOT_DRIVER(mt7621_clk) = { + .name = "mt7621-clk", + .id = UCLASS_CLK, + .of_match = mt7621_clk_ids, + .probe = mt7621_clk_probe, + .priv_auto = sizeof(struct mt7621_clk_priv), + .ops = &mt7621_clk_ops, +}; diff --git a/include/dt-bindings/clock/mt7621-clk.h b/include/dt-bindings/clock/mt7621-clk.h new file mode 100644 index 0000000000..978c67951b --- /dev/null +++ b/include/dt-bindings/clock/mt7621-clk.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2022 MediaTek Inc. All rights reserved. + * + * Author: Weijie Gao weijie.gao@mediatek.com + */ + +#ifndef _DT_BINDINGS_MT7621_CLK_H_ +#define _DT_BINDINGS_MT7621_CLK_H_ + +#define MT7621_CLK_XTAL 0 +#define MT7621_CLK_CPU 1 +#define MT7621_CLK_BUS 2 +#define MT7621_CLK_50M 3 +#define MT7621_CLK_125M 4 +#define MT7621_CLK_150M 5 +#define MT7621_CLK_250M 6 +#define MT7621_CLK_270M 7 + +#define MT7621_CLK_HSDMA 8 +#define MT7621_CLK_FE 9 +#define MT7621_CLK_SP_DIVTX 10 +#define MT7621_CLK_TIMER 11 +#define MT7621_CLK_PCM 12 +#define MT7621_CLK_PIO 13 +#define MT7621_CLK_GDMA 14 +#define MT7621_CLK_NAND 15 +#define MT7621_CLK_I2C 16 +#define MT7621_CLK_I2S 17 +#define MT7621_CLK_SPI 18 +#define MT7621_CLK_UART1 19 +#define MT7621_CLK_UART2 20 +#define MT7621_CLK_UART3 21 +#define MT7621_CLK_ETH 22 +#define MT7621_CLK_PCIE0 23 +#define MT7621_CLK_PCIE1 24 +#define MT7621_CLK_PCIE2 25 +#define MT7621_CLK_CRYPTO 26 +#define MT7621_CLK_SHXC 27 + +#define MT7621_CLK_MAX 28 + +/* for u-boot only */ +#define MT7621_CLK_DDR 29 + +#endif /* _DT_BINDINGS_MT7621_CLK_H_ */