This patch adds a clock driver for MediaTek MT7620 SoC. This driver provides clock gate control as well as getting clock frequency for CPU/SYS/XTAL and some peripherals.
Reviewed-by: Stefan Roese sr@denx.de Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- v4 changes: none v3 changes: none v2 changes: none --- drivers/clk/mtmips/Makefile | 1 + drivers/clk/mtmips/clk-mt7620.c | 159 +++++++++++++++++++++++++ include/dt-bindings/clock/mt7620-clk.h | 40 +++++++ 3 files changed, 200 insertions(+) create mode 100644 drivers/clk/mtmips/clk-mt7620.c create mode 100644 include/dt-bindings/clock/mt7620-clk.h
diff --git a/drivers/clk/mtmips/Makefile b/drivers/clk/mtmips/Makefile index e1938418da..732e7f2545 100644 --- a/drivers/clk/mtmips/Makefile +++ b/drivers/clk/mtmips/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_SOC_MT7620) += clk-mt7620.o obj-$(CONFIG_SOC_MT7628) += clk-mt7628.o diff --git a/drivers/clk/mtmips/clk-mt7620.c b/drivers/clk/mtmips/clk-mt7620.c new file mode 100644 index 0000000000..44e4b53c21 --- /dev/null +++ b/drivers/clk/mtmips/clk-mt7620.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020 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 <dt-bindings/clock/mt7620-clk.h> +#include <misc.h> +#include <mach/mt7620-sysc.h> + +/* CLKCFG1 */ +#define CLKCFG1_REG 0x30 + +#define CLK_SRC_CPU -1 +#define CLK_SRC_CPU_D2 -2 +#define CLK_SRC_SYS -3 +#define CLK_SRC_XTAL -4 +#define CLK_SRC_PERI -5 + +struct mt7620_clk_priv { + struct udevice *dev; + struct udevice *sysc; + struct mt7620_sysc_clks clks; +}; + +static const int mt7620_clks[] = { + [CLK_SYS] = CLK_SRC_SYS, + [CLK_CPU] = CLK_SRC_CPU, + [CLK_XTAL] = CLK_SRC_XTAL, + [CLK_MIPS_CNT] = CLK_SRC_CPU_D2, + [CLK_UARTF] = CLK_SRC_PERI, + [CLK_UARTL] = CLK_SRC_PERI, + [CLK_SPI] = CLK_SRC_SYS, + [CLK_I2C] = CLK_SRC_PERI, + [CLK_I2S] = CLK_SRC_PERI, +}; + +static ulong mt7620_clk_get_rate(struct clk *clk) +{ + struct mt7620_clk_priv *priv = dev_get_priv(clk->dev); + + if (clk->id >= ARRAY_SIZE(mt7620_clks)) + return 0; + + switch (mt7620_clks[clk->id]) { + case CLK_SRC_CPU: + return priv->clks.cpu_clk; + case CLK_SRC_CPU_D2: + return priv->clks.cpu_clk / 2; + case CLK_SRC_SYS: + return priv->clks.sys_clk; + case CLK_SRC_XTAL: + return priv->clks.xtal_clk; + case CLK_SRC_PERI: + return priv->clks.peri_clk; + default: + return mt7620_clks[clk->id]; + } +} + +static int mt7620_clkcfg1_rmw(struct mt7620_clk_priv *priv, u32 clr, u32 set) +{ + u32 val; + int ret; + + ret = misc_read(priv->sysc, CLKCFG1_REG, &val, sizeof(val)); + if (ret) { + dev_err(priv->dev, "mt7620_clk: failed to read CLKCFG1\n"); + return ret; + } + + val &= ~clr; + val |= set; + + ret = misc_write(priv->sysc, CLKCFG1_REG, &val, sizeof(val)); + if (ret) { + dev_err(priv->dev, "mt7620_clk: failed to write CLKCFG1\n"); + return ret; + } + + return 0; +} + +static int mt7620_clk_enable(struct clk *clk) +{ + struct mt7620_clk_priv *priv = dev_get_priv(clk->dev); + + if (clk->id > 30) + return -1; + + return mt7620_clkcfg1_rmw(priv, 0, BIT(clk->id)); +} + +static int mt7620_clk_disable(struct clk *clk) +{ + struct mt7620_clk_priv *priv = dev_get_priv(clk->dev); + + if (clk->id > 30) + return -1; + + return mt7620_clkcfg1_rmw(priv, BIT(clk->id), 0); +} + +const struct clk_ops mt7620_clk_ops = { + .enable = mt7620_clk_enable, + .disable = mt7620_clk_disable, + .get_rate = mt7620_clk_get_rate, +}; + +static int mt7620_clk_probe(struct udevice *dev) +{ + struct mt7620_clk_priv *priv = dev_get_priv(dev); + struct ofnode_phandle_args sysc_args; + int ret; + + ret = ofnode_parse_phandle_with_args(dev->node, "mediatek,sysc", NULL, + 0, 0, &sysc_args); + if (ret) { + dev_err(dev, "mt7620_clk: sysc property not found\n"); + return ret; + } + + ret = uclass_get_device_by_ofnode(UCLASS_MISC, sysc_args.node, + &priv->sysc); + if (ret) { + dev_err(dev, "mt7620_clk: failed to sysc device\n"); + return ret; + } + + ret = misc_ioctl(priv->sysc, MT7620_SYSC_IOCTL_GET_CLK, + &priv->clks); + if (ret) { + dev_err(dev, "mt7620_clk: failed to get base clocks\n"); + return ret; + } + + priv->dev = dev; + + return 0; +} + +static const struct udevice_id mt7620_clk_ids[] = { + { .compatible = "mediatek,mt7620-clk" }, + { } +}; + +U_BOOT_DRIVER(mt7620_clk) = { + .name = "mt7620-clk", + .id = UCLASS_CLK, + .of_match = mt7620_clk_ids, + .probe = mt7620_clk_probe, + .priv_auto_alloc_size = sizeof(struct mt7620_clk_priv), + .ops = &mt7620_clk_ops, + .flags = DM_FLAG_PRE_RELOC, +}; diff --git a/include/dt-bindings/clock/mt7620-clk.h b/include/dt-bindings/clock/mt7620-clk.h new file mode 100644 index 0000000000..3bb91ebdf1 --- /dev/null +++ b/include/dt-bindings/clock/mt7620-clk.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020 MediaTek Inc. + * + * Author: Weijie Gao weijie.gao@mediatek.com + */ + +#ifndef _DT_BINDINGS_MT7620_CLK_H_ +#define _DT_BINDINGS_MT7620_CLK_H_ + +/* Base clocks */ +#define CLK_SYS 34 +#define CLK_CPU 33 +#define CLK_XTAL 32 + +/* Peripheral clocks */ +#define CLK_SDHC 30 +#define CLK_MIPS_CNT 28 +#define CLK_PCIE 26 +#define CLK_UPHY_12M 25 +#define CLK_EPHY 24 +#define CLK_ESW 23 +#define CLK_UPHY_48M 22 +#define CLK_FE 21 +#define CLK_UARTL 19 +#define CLK_SPI 18 +#define CLK_I2S 17 +#define CLK_I2C 16 +#define CLK_NAND 15 +#define CLK_GDMA 14 +#define CLK_PIO 13 +#define CLK_UARTF 12 +#define CLK_PCM 11 +#define CLK_MC 10 +#define CLK_INTC 9 +#define CLK_TIMER 8 +#define CLK_GE2 7 +#define CLK_GE1 6 + +#endif /* _DT_BINDINGS_MT7620_CLK_H_ */