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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
234 lines
5.5 KiB
C
234 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Samsung Exynos7420 clock driver.
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* Copyright (C) 2016 Samsung Electronics
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* Thomas Abraham <thomas.ab@samsung.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <clk-uclass.h>
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#include <asm/io.h>
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#include <dt-bindings/clock/exynos7420-clk.h>
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#include "clk-pll.h"
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#define DIVIDER(reg, shift, mask) \
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(((readl(reg) >> shift) & mask) + 1)
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/* CMU TOPC block device structure */
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struct exynos7420_clk_cmu_topc {
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unsigned int rsvd1[68];
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unsigned int bus0_pll_con[2];
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unsigned int rsvd2[2];
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unsigned int bus1_pll_con[2];
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unsigned int rsvd3[54];
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unsigned int mux_sel[6];
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unsigned int rsvd4[250];
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unsigned int div[4];
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};
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/* CMU TOP0 block device structure */
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struct exynos7420_clk_cmu_top0 {
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unsigned int rsvd0[128];
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unsigned int mux_sel[7];
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unsigned int rsvd1[261];
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unsigned int div_peric[5];
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};
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/**
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* struct exynos7420_clk_topc_priv - private data for CMU topc clock driver.
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*
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* @topc: base address of the memory mapped CMU TOPC controller.
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* @fin_freq: frequency of the Oscillator clock.
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* @sclk_bus0_pll_a: frequency of sclk_bus0_pll_a clock.
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* @sclk_bus1_pll_a: frequency of sclk_bus1_pll_a clock.
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*/
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struct exynos7420_clk_topc_priv {
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struct exynos7420_clk_cmu_topc *topc;
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unsigned long fin_freq;
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unsigned long sclk_bus0_pll_a;
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unsigned long sclk_bus1_pll_a;
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};
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/**
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* struct exynos7420_clk_top0_priv - private data for CMU top0 clock driver.
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*
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* @top0: base address of the memory mapped CMU TOP0 controller.
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* @mout_top0_bus0_pll_half: frequency of mout_top0_bus0_pll_half clock
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* @sclk_uart2: frequency of sclk_uart2 clock.
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*/
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struct exynos7420_clk_top0_priv {
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struct exynos7420_clk_cmu_top0 *top0;
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unsigned long mout_top0_bus0_pll_half;
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unsigned long sclk_uart2;
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};
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static ulong exynos7420_topc_get_rate(struct clk *clk)
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{
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struct exynos7420_clk_topc_priv *priv = dev_get_priv(clk->dev);
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switch (clk->id) {
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case DOUT_SCLK_BUS0_PLL:
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case SCLK_BUS0_PLL_A:
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case SCLK_BUS0_PLL_B:
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return priv->sclk_bus0_pll_a;
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case DOUT_SCLK_BUS1_PLL:
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case SCLK_BUS1_PLL_A:
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case SCLK_BUS1_PLL_B:
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return priv->sclk_bus1_pll_a;
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default:
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return 0;
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}
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}
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static struct clk_ops exynos7420_clk_topc_ops = {
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.get_rate = exynos7420_topc_get_rate,
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};
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static int exynos7420_clk_topc_probe(struct udevice *dev)
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{
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struct exynos7420_clk_topc_priv *priv = dev_get_priv(dev);
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struct exynos7420_clk_cmu_topc *topc;
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struct clk in_clk;
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unsigned long rate;
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fdt_addr_t base;
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int ret;
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base = devfdt_get_addr(dev);
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if (base == FDT_ADDR_T_NONE)
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return -EINVAL;
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topc = (struct exynos7420_clk_cmu_topc *)base;
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priv->topc = topc;
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ret = clk_get_by_index(dev, 0, &in_clk);
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if (ret >= 0)
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priv->fin_freq = clk_get_rate(&in_clk);
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rate = pll145x_get_rate(&topc->bus0_pll_con[0], priv->fin_freq);
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if (readl(&topc->mux_sel[1]) & (1 << 16))
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rate >>= 1;
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rate /= DIVIDER(&topc->div[3], 0, 0xf);
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priv->sclk_bus0_pll_a = rate;
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rate = pll145x_get_rate(&topc->bus1_pll_con[0], priv->fin_freq) /
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DIVIDER(&topc->div[3], 8, 0xf);
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priv->sclk_bus1_pll_a = rate;
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return 0;
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}
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static ulong exynos7420_top0_get_rate(struct clk *clk)
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{
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struct exynos7420_clk_top0_priv *priv = dev_get_priv(clk->dev);
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struct exynos7420_clk_cmu_top0 *top0 = priv->top0;
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switch (clk->id) {
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case CLK_SCLK_UART2:
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return priv->mout_top0_bus0_pll_half /
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DIVIDER(&top0->div_peric[3], 8, 0xf);
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default:
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return 0;
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}
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}
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static struct clk_ops exynos7420_clk_top0_ops = {
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.get_rate = exynos7420_top0_get_rate,
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};
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static int exynos7420_clk_top0_probe(struct udevice *dev)
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{
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struct exynos7420_clk_top0_priv *priv;
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struct exynos7420_clk_cmu_top0 *top0;
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struct clk in_clk;
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fdt_addr_t base;
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int ret;
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priv = dev_get_priv(dev);
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if (!priv)
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return -EINVAL;
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base = devfdt_get_addr(dev);
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if (base == FDT_ADDR_T_NONE)
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return -EINVAL;
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top0 = (struct exynos7420_clk_cmu_top0 *)base;
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priv->top0 = top0;
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ret = clk_get_by_index(dev, 1, &in_clk);
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if (ret >= 0) {
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priv->mout_top0_bus0_pll_half =
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clk_get_rate(&in_clk);
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if (readl(&top0->mux_sel[1]) & (1 << 16))
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priv->mout_top0_bus0_pll_half >>= 1;
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}
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return 0;
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}
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static ulong exynos7420_peric1_get_rate(struct clk *clk)
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{
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struct clk in_clk;
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unsigned int ret;
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unsigned long freq = 0;
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switch (clk->id) {
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case SCLK_UART2:
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ret = clk_get_by_index(clk->dev, 3, &in_clk);
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if (ret < 0)
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return ret;
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freq = clk_get_rate(&in_clk);
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break;
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}
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return freq;
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}
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static struct clk_ops exynos7420_clk_peric1_ops = {
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.get_rate = exynos7420_peric1_get_rate,
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};
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static const struct udevice_id exynos7420_clk_topc_compat[] = {
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{ .compatible = "samsung,exynos7-clock-topc" },
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{ }
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};
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U_BOOT_DRIVER(exynos7420_clk_topc) = {
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.name = "exynos7420-clock-topc",
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.id = UCLASS_CLK,
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.of_match = exynos7420_clk_topc_compat,
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.probe = exynos7420_clk_topc_probe,
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.priv_auto_alloc_size = sizeof(struct exynos7420_clk_topc_priv),
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.ops = &exynos7420_clk_topc_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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static const struct udevice_id exynos7420_clk_top0_compat[] = {
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{ .compatible = "samsung,exynos7-clock-top0" },
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{ }
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};
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U_BOOT_DRIVER(exynos7420_clk_top0) = {
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.name = "exynos7420-clock-top0",
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.id = UCLASS_CLK,
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.of_match = exynos7420_clk_top0_compat,
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.probe = exynos7420_clk_top0_probe,
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.priv_auto_alloc_size = sizeof(struct exynos7420_clk_top0_priv),
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.ops = &exynos7420_clk_top0_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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static const struct udevice_id exynos7420_clk_peric1_compat[] = {
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{ .compatible = "samsung,exynos7-clock-peric1" },
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{ }
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};
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U_BOOT_DRIVER(exynos7420_clk_peric1) = {
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.name = "exynos7420-clock-peric1",
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.id = UCLASS_CLK,
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.of_match = exynos7420_clk_peric1_compat,
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.ops = &exynos7420_clk_peric1_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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