diff options
Diffstat (limited to 'roms/u-boot/drivers/clk/mtmips/clk-mt7628.c')
| -rw-r--r-- | roms/u-boot/drivers/clk/mtmips/clk-mt7628.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/clk/mtmips/clk-mt7628.c b/roms/u-boot/drivers/clk/mtmips/clk-mt7628.c new file mode 100644 index 000000000..4d3ac847d --- /dev/null +++ b/roms/u-boot/drivers/clk/mtmips/clk-mt7628.c @@ -0,0 +1,158 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 MediaTek Inc. All Rights Reserved. + * + * Author: Weijie Gao <weijie.gao@mediatek.com> + */ + +#include <common.h> +#include <clk-uclass.h> +#include <dm.h> +#include <dt-bindings/clock/mt7628-clk.h> +#include <linux/bitops.h> +#include <linux/io.h> + +/* SYSCFG0 */ +#define XTAL_40M_SEL BIT(6) + +/* CLKCFG0 */ +#define CLKCFG0_REG 0x0 +#define PERI_CLK_FROM_XTAL_SEL BIT(4) +#define CPU_PLL_FROM_BBP BIT(1) +#define CPU_PLL_FROM_XTAL BIT(0) + +/* CLKCFG1 */ +#define CLKCFG1_REG 0x4 + +#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 mt7628_clk_priv { + void __iomem *base; + int cpu_clk; + int sys_clk; + int xtal_clk; +}; + +static const int mt7628_clks[] = { + [CLK_SYS] = CLK_SRC_SYS, + [CLK_CPU] = CLK_SRC_CPU, + [CLK_XTAL] = CLK_SRC_XTAL, + [CLK_PWM] = CLK_SRC_PERI, + [CLK_MIPS_CNT] = CLK_SRC_CPU_D2, + [CLK_UART2] = CLK_SRC_PERI, + [CLK_UART1] = CLK_SRC_PERI, + [CLK_UART0] = CLK_SRC_PERI, + [CLK_SPI] = CLK_SRC_SYS, + [CLK_I2C] = CLK_SRC_PERI, +}; + +static ulong mt7628_clk_get_rate(struct clk *clk) +{ + struct mt7628_clk_priv *priv = dev_get_priv(clk->dev); + u32 val; + + if (clk->id >= ARRAY_SIZE(mt7628_clks)) + return 0; + + switch (mt7628_clks[clk->id]) { + case CLK_SRC_CPU: + return priv->cpu_clk; + case CLK_SRC_CPU_D2: + return priv->cpu_clk / 2; + case CLK_SRC_SYS: + return priv->sys_clk; + case CLK_SRC_XTAL: + return priv->xtal_clk; + case CLK_SRC_PERI: + val = readl(priv->base + CLKCFG0_REG); + if (val & PERI_CLK_FROM_XTAL_SEL) + return priv->xtal_clk; + else + return 40000000; + default: + return mt7628_clks[clk->id]; + } +} + +static int mt7628_clk_enable(struct clk *clk) +{ + struct mt7628_clk_priv *priv = dev_get_priv(clk->dev); + + if (clk->id > 31) + return -1; + + setbits_32(priv->base + CLKCFG1_REG, BIT(clk->id)); + + return 0; +} + +static int mt7628_clk_disable(struct clk *clk) +{ + struct mt7628_clk_priv *priv = dev_get_priv(clk->dev); + + if (clk->id > 31) + return -1; + + clrbits_32(priv->base + CLKCFG1_REG, BIT(clk->id)); + + return 0; +} + +const struct clk_ops mt7628_clk_ops = { + .enable = mt7628_clk_enable, + .disable = mt7628_clk_disable, + .get_rate = mt7628_clk_get_rate, +}; + +static int mt7628_clk_probe(struct udevice *dev) +{ + struct mt7628_clk_priv *priv = dev_get_priv(dev); + void __iomem *syscfg_base; + u32 val; + + priv->base = (void __iomem *)dev_remap_addr_index(dev, 0); + if (!priv->base) + return -EINVAL; + + syscfg_base = (void __iomem *)dev_remap_addr_index(dev, 1); + if (!syscfg_base) + return -EINVAL; + + val = readl(syscfg_base); + if (val & XTAL_40M_SEL) + priv->xtal_clk = 40000000; + else + priv->xtal_clk = 25000000; + + val = readl(priv->base + CLKCFG0_REG); + if (val & CPU_PLL_FROM_BBP) + priv->cpu_clk = 480000000; + else if (val & CPU_PLL_FROM_XTAL) + priv->cpu_clk = priv->xtal_clk; + else if (priv->xtal_clk == 40000000) + priv->cpu_clk = 580000000; /* (xtal_freq / 2) * 29 */ + else + priv->cpu_clk = 575000000; /* xtal_freq * 23 */ + + priv->sys_clk = priv->cpu_clk / 3; + + return 0; +} + +static const struct udevice_id mt7628_clk_ids[] = { + { .compatible = "mediatek,mt7628-clk" }, + { } +}; + +U_BOOT_DRIVER(mt7628_clk) = { + .name = "mt7628-clk", + .id = UCLASS_CLK, + .of_match = mt7628_clk_ids, + .probe = mt7628_clk_probe, + .priv_auto = sizeof(struct mt7628_clk_priv), + .ops = &mt7628_clk_ops, +}; |