clk: add clock driver for MediaTek MT76x8 platform

This patch adds a clock driver for MediaTek MT7628/7688 SoC.
It provides clock gate control as well as getting clock frequency for
CPU/SYS/XTAL and some peripherals.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 8de67774680069679ccd277eb9cfa09918f5f2d7..06131edb9fe58cbfb8f7177ed627f8cc5c4601b8 100644 (file)
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -16,6 +16,7 @@ obj-y += imx/
 obj-y += tegra/
 obj-$(CONFIG_ARCH_ASPEED) += aspeed/
 obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/
+obj-$(CONFIG_ARCH_MTMIPS) += mtmips/
 obj-$(CONFIG_ARCH_MESON) += meson/
 obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
 obj-$(CONFIG_ARCH_SOCFPGA) += altera/

diff --git a/drivers/clk/mtmips/Makefile b/drivers/clk/mtmips/Makefile
new file mode 100644 (file)
index 0000000..e193841
--- /dev/null
+++ b/drivers/clk/mtmips/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_SOC_MT7628) += clk-mt7628.o

diff --git a/drivers/clk/mtmips/clk-mt7628.c b/drivers/clk/mtmips/clk-mt7628.c
new file mode 100644 (file)
index 0000000..35780de
--- /dev/null
+++ b/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_alloc_size = sizeof(struct mt7628_clk_priv),
+       .ops = &mt7628_clk_ops,
+};

diff --git a/include/dt-bindings/clock/mt7628-clk.h b/include/dt-bindings/clock/mt7628-clk.h
new file mode 100644 (file)
index 0000000..b5866fd
--- /dev/null
+++ b/include/dt-bindings/clock/mt7628-clk.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 MediaTek Inc.
+ *
+ * Author:  Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#ifndef _DT_BINDINGS_MT7628_CLK_H_
+#define _DT_BINDINGS_MT7628_CLK_H_
+
+/* Base clocks */
+#define CLK_SYS                                34
+#define CLK_CPU                                33
+#define CLK_XTAL                       32
+
+/* Peripheral clocks */
+#define CLK_PWM                                31
+#define CLK_SDXC                       30
+#define CLK_CRYPTO                     29
+#define CLK_MIPS_CNT                   28
+#define CLK_PCIE                       26
+#define CLK_UPHY                       25
+#define CLK_ETH                                23
+#define CLK_UART2                      20
+#define CLK_UART1                      19
+#define CLK_SPI                                18
+#define CLK_I2S                                17
+#define CLK_I2C                                16
+#define CLK_GDMA                       14
+#define CLK_PIO                                13
+#define CLK_UART0                      12
+#define CLK_PCM                                11
+#define CLK_MC                         10
+#define CLK_INTC                       9
+#define CLK_TIMER                      8
+
+#endif /* _DT_BINDINGS_MT7628_CLK_H_ */