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https://github.com/AsahiLinux/u-boot
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
158 lines
3.3 KiB
C
158 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 MediaTek Inc. All Rights Reserved.
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*
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* Author: Weijie Gao <weijie.gao@mediatek.com>
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*/
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#include <common.h>
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#include <clk-uclass.h>
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#include <dm.h>
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#include <dt-bindings/clock/mt7628-clk.h>
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#include <linux/bitops.h>
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#include <linux/io.h>
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/* SYSCFG0 */
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#define XTAL_40M_SEL BIT(6)
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/* CLKCFG0 */
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#define CLKCFG0_REG 0x0
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#define PERI_CLK_FROM_XTAL_SEL BIT(4)
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#define CPU_PLL_FROM_BBP BIT(1)
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#define CPU_PLL_FROM_XTAL BIT(0)
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/* CLKCFG1 */
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#define CLKCFG1_REG 0x4
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#define CLK_SRC_CPU -1
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#define CLK_SRC_CPU_D2 -2
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#define CLK_SRC_SYS -3
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#define CLK_SRC_XTAL -4
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#define CLK_SRC_PERI -5
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struct mt7628_clk_priv {
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void __iomem *base;
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int cpu_clk;
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int sys_clk;
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int xtal_clk;
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};
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static const int mt7628_clks[] = {
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[CLK_SYS] = CLK_SRC_SYS,
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[CLK_CPU] = CLK_SRC_CPU,
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[CLK_XTAL] = CLK_SRC_XTAL,
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[CLK_PWM] = CLK_SRC_PERI,
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[CLK_MIPS_CNT] = CLK_SRC_CPU_D2,
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[CLK_UART2] = CLK_SRC_PERI,
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[CLK_UART1] = CLK_SRC_PERI,
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[CLK_UART0] = CLK_SRC_PERI,
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[CLK_SPI] = CLK_SRC_SYS,
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[CLK_I2C] = CLK_SRC_PERI,
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};
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static ulong mt7628_clk_get_rate(struct clk *clk)
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{
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struct mt7628_clk_priv *priv = dev_get_priv(clk->dev);
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u32 val;
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if (clk->id >= ARRAY_SIZE(mt7628_clks))
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return 0;
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switch (mt7628_clks[clk->id]) {
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case CLK_SRC_CPU:
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return priv->cpu_clk;
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case CLK_SRC_CPU_D2:
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return priv->cpu_clk / 2;
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case CLK_SRC_SYS:
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return priv->sys_clk;
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case CLK_SRC_XTAL:
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return priv->xtal_clk;
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case CLK_SRC_PERI:
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val = readl(priv->base + CLKCFG0_REG);
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if (val & PERI_CLK_FROM_XTAL_SEL)
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return priv->xtal_clk;
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else
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return 40000000;
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default:
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return mt7628_clks[clk->id];
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}
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}
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static int mt7628_clk_enable(struct clk *clk)
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{
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struct mt7628_clk_priv *priv = dev_get_priv(clk->dev);
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if (clk->id > 31)
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return -1;
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setbits_32(priv->base + CLKCFG1_REG, BIT(clk->id));
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return 0;
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}
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static int mt7628_clk_disable(struct clk *clk)
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{
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struct mt7628_clk_priv *priv = dev_get_priv(clk->dev);
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if (clk->id > 31)
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return -1;
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clrbits_32(priv->base + CLKCFG1_REG, BIT(clk->id));
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return 0;
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}
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const struct clk_ops mt7628_clk_ops = {
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.enable = mt7628_clk_enable,
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.disable = mt7628_clk_disable,
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.get_rate = mt7628_clk_get_rate,
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};
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static int mt7628_clk_probe(struct udevice *dev)
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{
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struct mt7628_clk_priv *priv = dev_get_priv(dev);
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void __iomem *syscfg_base;
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u32 val;
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priv->base = (void __iomem *)dev_remap_addr_index(dev, 0);
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if (!priv->base)
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return -EINVAL;
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syscfg_base = (void __iomem *)dev_remap_addr_index(dev, 1);
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if (!syscfg_base)
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return -EINVAL;
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val = readl(syscfg_base);
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if (val & XTAL_40M_SEL)
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priv->xtal_clk = 40000000;
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else
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priv->xtal_clk = 25000000;
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val = readl(priv->base + CLKCFG0_REG);
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if (val & CPU_PLL_FROM_BBP)
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priv->cpu_clk = 480000000;
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else if (val & CPU_PLL_FROM_XTAL)
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priv->cpu_clk = priv->xtal_clk;
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else if (priv->xtal_clk == 40000000)
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priv->cpu_clk = 580000000; /* (xtal_freq / 2) * 29 */
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else
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priv->cpu_clk = 575000000; /* xtal_freq * 23 */
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priv->sys_clk = priv->cpu_clk / 3;
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return 0;
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}
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static const struct udevice_id mt7628_clk_ids[] = {
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{ .compatible = "mediatek,mt7628-clk" },
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{ }
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};
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U_BOOT_DRIVER(mt7628_clk) = {
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.name = "mt7628-clk",
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.id = UCLASS_CLK,
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.of_match = mt7628_clk_ids,
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.probe = mt7628_clk_probe,
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.priv_auto = sizeof(struct mt7628_clk_priv),
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.ops = &mt7628_clk_ops,
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};
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