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linux/drivers/clk/mmp/clk-audio.c
Lubomir Rintel 725262d291 clk: mmp2: Add audio clock controller driver 
This is a driver for a block that generates master and bit clocks for
the I2S interface. It's separate from the PMUs that generate clocks for
the peripherals.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lkml.kernel.org/r/20200519224151.2074597-14-lkundrak@v3.sk
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2020-05-27 17:55:12 -07:00

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13 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MMP Audio Clock Controller driver
*
* Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
*/
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_clock.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <dt-bindings/clock/marvell,mmp2-audio.h>
/* Audio Controller Registers */
#define SSPA_AUD_CTRL 0x04
#define SSPA_AUD_PLL_CTRL0 0x08
#define SSPA_AUD_PLL_CTRL1 0x0c
/* SSPA Audio Control Register */
#define SSPA_AUD_CTRL_SYSCLK_SHIFT 0
#define SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT 1
#define SSPA_AUD_CTRL_SSPA0_MUX_SHIFT 7
#define SSPA_AUD_CTRL_SSPA0_SHIFT 8
#define SSPA_AUD_CTRL_SSPA0_DIV_SHIFT 9
#define SSPA_AUD_CTRL_SSPA1_SHIFT 16
#define SSPA_AUD_CTRL_SSPA1_DIV_SHIFT 17
#define SSPA_AUD_CTRL_SSPA1_MUX_SHIFT 23
#define SSPA_AUD_CTRL_DIV_MASK 0x7e
/* SSPA Audio PLL Control 0 Register */
#define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK (0x7 << 28)
#define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(x) ((x) << 28)
#define SSPA_AUD_PLL_CTRL0_FRACT_MASK (0xfffff << 8)
#define SSPA_AUD_PLL_CTRL0_FRACT(x) ((x) << 8)
#define SSPA_AUD_PLL_CTRL0_ENA_DITHER (1 << 7)
#define SSPA_AUD_PLL_CTRL0_ICP_2UA (0 << 5)
#define SSPA_AUD_PLL_CTRL0_ICP_5UA (1 << 5)
#define SSPA_AUD_PLL_CTRL0_ICP_7UA (2 << 5)
#define SSPA_AUD_PLL_CTRL0_ICP_10UA (3 << 5)
#define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK (0x3 << 3)
#define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(x) ((x) << 3)
#define SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK (0x1 << 2)
#define SSPA_AUD_PLL_CTRL0_DIV_MCLK(x) ((x) << 2)
#define SSPA_AUD_PLL_CTRL0_PD_OVPROT_DIS (1 << 1)
#define SSPA_AUD_PLL_CTRL0_PU (1 << 0)
/* SSPA Audio PLL Control 1 Register */
#define SSPA_AUD_PLL_CTRL1_SEL_FAST_CLK (1 << 24)
#define SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK (1 << 11)
#define SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL (1 << 11)
#define SSPA_AUD_PLL_CTRL1_CLK_SEL_VCXO (0 << 11)
#define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK (0x7ff << 0)
#define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(x) ((x) << 0)
struct mmp2_audio_clk {
void __iomem *mmio_base;
struct clk_hw audio_pll_hw;
struct clk_mux sspa_mux;
struct clk_mux sspa1_mux;
struct clk_divider sysclk_div;
struct clk_divider sspa0_div;
struct clk_divider sspa1_div;
struct clk_gate sysclk_gate;
struct clk_gate sspa0_gate;
struct clk_gate sspa1_gate;
u32 aud_ctrl;
u32 aud_pll_ctrl0;
u32 aud_pll_ctrl1;
spinlock_t lock;
/* Must be last */
struct clk_hw_onecell_data clk_data;
};
static const struct {
unsigned long parent_rate;
unsigned long freq_vco;
unsigned char mclk;
unsigned char fbcclk;
unsigned short fract;
} predivs[] = {
{ 26000000, 135475200, 0, 0, 0x8a18 },
{ 26000000, 147456000, 0, 1, 0x0da1 },
{ 38400000, 135475200, 1, 2, 0x8208 },
{ 38400000, 147456000, 1, 3, 0xaaaa },
};
static const struct {
unsigned char divisor;
unsigned char modulo;
unsigned char pattern;
} postdivs[] = {
{ 1, 3, 0, },
{ 2, 5, 0, },
{ 4, 0, 0, },
{ 6, 1, 1, },
{ 8, 1, 0, },
{ 9, 1, 2, },
{ 12, 2, 1, },
{ 16, 2, 0, },
{ 18, 2, 2, },
{ 24, 4, 1, },
{ 36, 4, 2, },
{ 48, 6, 1, },
{ 72, 6, 2, },
};
static unsigned long audio_pll_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
unsigned int prediv;
unsigned int postdiv;
u32 aud_pll_ctrl0;
u32 aud_pll_ctrl1;
aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
aud_pll_ctrl0 &= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK |
SSPA_AUD_PLL_CTRL0_FRACT_MASK |
SSPA_AUD_PLL_CTRL0_ENA_DITHER |
SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK |
SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK |
SSPA_AUD_PLL_CTRL0_PU;
aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
aud_pll_ctrl1 &= SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK |
SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK;
for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
if (predivs[prediv].parent_rate != parent_rate)
continue;
for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
unsigned long freq;
u32 val;
val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
val |= SSPA_AUD_PLL_CTRL0_PU;
val |= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
val |= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
val |= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
val |= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
if (val != aud_pll_ctrl0)
continue;
val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
val |= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
if (val != aud_pll_ctrl1)
continue;
freq = predivs[prediv].freq_vco;
freq /= postdivs[postdiv].divisor;
return freq;
}
}
return 0;
}
static long audio_pll_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
unsigned int prediv;
unsigned int postdiv;
long rounded = 0;
for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
if (predivs[prediv].parent_rate != *parent_rate)
continue;
for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
long freq = predivs[prediv].freq_vco;
freq /= postdivs[postdiv].divisor;
if (freq == rate)
return rate;
if (freq < rate)
continue;
if (rounded && freq > rounded)
continue;
rounded = freq;
}
}
return rounded;
}
static int audio_pll_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
unsigned int prediv;
unsigned int postdiv;
unsigned long val;
for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
if (predivs[prediv].parent_rate != parent_rate)
continue;
for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
if (rate * postdivs[postdiv].divisor != predivs[prediv].freq_vco)
continue;
val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
val |= SSPA_AUD_PLL_CTRL0_PU;
val |= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
val |= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
val |= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
val |= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL0);
val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
val |= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL1);
return 0;
}
}
return -ERANGE;
}
static const struct clk_ops audio_pll_ops = {
.recalc_rate = audio_pll_recalc_rate,
.round_rate = audio_pll_round_rate,
.set_rate = audio_pll_set_rate,
};
static int register_clocks(struct mmp2_audio_clk *priv, struct device *dev)
{
const struct clk_parent_data sspa_mux_parents[] = {
{ .hw = &priv->audio_pll_hw },
{ .fw_name = "i2s0" },
};
const struct clk_parent_data sspa1_mux_parents[] = {
{ .hw = &priv->audio_pll_hw },
{ .fw_name = "i2s1" },
};
int ret;
priv->audio_pll_hw.init = CLK_HW_INIT_FW_NAME("audio_pll",
"vctcxo", &audio_pll_ops,
CLK_SET_RATE_PARENT);
ret = devm_clk_hw_register(dev, &priv->audio_pll_hw);
if (ret)
return ret;
priv->sspa_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa_mux",
sspa_mux_parents, &clk_mux_ops,
CLK_SET_RATE_PARENT);
priv->sspa_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
priv->sspa_mux.mask = 1;
priv->sspa_mux.shift = SSPA_AUD_CTRL_SSPA0_MUX_SHIFT;
ret = devm_clk_hw_register(dev, &priv->sspa_mux.hw);
if (ret)
return ret;
priv->sysclk_div.hw.init = CLK_HW_INIT_HW("sys_div",
&priv->sspa_mux.hw, &clk_divider_ops,
CLK_SET_RATE_PARENT);
priv->sysclk_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
priv->sysclk_div.shift = SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT;
priv->sysclk_div.width = 6;
priv->sysclk_div.flags = CLK_DIVIDER_ONE_BASED;
priv->sysclk_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
priv->sysclk_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
ret = devm_clk_hw_register(dev, &priv->sysclk_div.hw);
if (ret)
return ret;
priv->sysclk_gate.hw.init = CLK_HW_INIT_HW("sys_clk",
&priv->sysclk_div.hw, &clk_gate_ops,
CLK_SET_RATE_PARENT);
priv->sysclk_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
priv->sysclk_gate.bit_idx = SSPA_AUD_CTRL_SYSCLK_SHIFT;
ret = devm_clk_hw_register(dev, &priv->sysclk_gate.hw);
if (ret)
return ret;
priv->sspa0_div.hw.init = CLK_HW_INIT_HW("sspa0_div",
&priv->sspa_mux.hw, &clk_divider_ops, 0);
priv->sspa0_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
priv->sspa0_div.shift = SSPA_AUD_CTRL_SSPA0_DIV_SHIFT;
priv->sspa0_div.width = 6;
priv->sspa0_div.flags = CLK_DIVIDER_ONE_BASED;
priv->sspa0_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
priv->sspa0_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
ret = devm_clk_hw_register(dev, &priv->sspa0_div.hw);
if (ret)
return ret;
priv->sspa0_gate.hw.init = CLK_HW_INIT_HW("sspa0_clk",
&priv->sspa0_div.hw, &clk_gate_ops,
CLK_SET_RATE_PARENT);
priv->sspa0_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
priv->sspa0_gate.bit_idx = SSPA_AUD_CTRL_SSPA0_SHIFT;
ret = devm_clk_hw_register(dev, &priv->sspa0_gate.hw);
if (ret)
return ret;
priv->sspa1_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa1_mux",
sspa1_mux_parents, &clk_mux_ops,
CLK_SET_RATE_PARENT);
priv->sspa1_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
priv->sspa1_mux.mask = 1;
priv->sspa1_mux.shift = SSPA_AUD_CTRL_SSPA1_MUX_SHIFT;
ret = devm_clk_hw_register(dev, &priv->sspa1_mux.hw);
if (ret)
return ret;
priv->sspa1_div.hw.init = CLK_HW_INIT_HW("sspa1_div",
&priv->sspa1_mux.hw, &clk_divider_ops, 0);
priv->sspa1_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
priv->sspa1_div.shift = SSPA_AUD_CTRL_SSPA1_DIV_SHIFT;
priv->sspa1_div.width = 6;
priv->sspa1_div.flags = CLK_DIVIDER_ONE_BASED;
priv->sspa1_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
priv->sspa1_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
ret = devm_clk_hw_register(dev, &priv->sspa1_div.hw);
if (ret)
return ret;
priv->sspa1_gate.hw.init = CLK_HW_INIT_HW("sspa1_clk",
&priv->sspa1_div.hw, &clk_gate_ops,
CLK_SET_RATE_PARENT);
priv->sspa1_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
priv->sspa1_gate.bit_idx = SSPA_AUD_CTRL_SSPA1_SHIFT;
ret = devm_clk_hw_register(dev, &priv->sspa1_gate.hw);
if (ret)
return ret;
priv->clk_data.hws[MMP2_CLK_AUDIO_SYSCLK] = &priv->sysclk_gate.hw;
priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA0] = &priv->sspa0_gate.hw;
priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA1] = &priv->sspa1_gate.hw;
priv->clk_data.num = MMP2_CLK_AUDIO_NR_CLKS;
return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
&priv->clk_data);
}
static int mmp2_audio_clk_probe(struct platform_device *pdev)
{
struct mmp2_audio_clk *priv;
int ret;
priv = devm_kzalloc(&pdev->dev,
struct_size(priv, clk_data.hws,
MMP2_CLK_AUDIO_NR_CLKS),
GFP_KERNEL);
if (!priv)
return -ENOMEM;
spin_lock_init(&priv->lock);
platform_set_drvdata(pdev, priv);
priv->mmio_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->mmio_base))
return PTR_ERR(priv->mmio_base);
pm_runtime_enable(&pdev->dev);
ret = pm_clk_create(&pdev->dev);
if (ret)
goto disable_pm_runtime;
ret = pm_clk_add(&pdev->dev, "audio");
if (ret)
goto destroy_pm_clk;
ret = register_clocks(priv, &pdev->dev);
if (ret)
goto destroy_pm_clk;
return 0;
destroy_pm_clk:
pm_clk_destroy(&pdev->dev);
disable_pm_runtime:
pm_runtime_disable(&pdev->dev);
return ret;
}
static int mmp2_audio_clk_remove(struct platform_device *pdev)
{
pm_clk_destroy(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
static int __maybe_unused mmp2_audio_clk_suspend(struct device *dev)
{
struct mmp2_audio_clk *priv = dev_get_drvdata(dev);
priv->aud_ctrl = readl(priv->mmio_base + SSPA_AUD_CTRL);
priv->aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
priv->aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
pm_clk_suspend(dev);
return 0;
}
static int __maybe_unused mmp2_audio_clk_resume(struct device *dev)
{
struct mmp2_audio_clk *priv = dev_get_drvdata(dev);
pm_clk_resume(dev);
writel(priv->aud_ctrl, priv->mmio_base + SSPA_AUD_CTRL);
writel(priv->aud_pll_ctrl0, priv->mmio_base + SSPA_AUD_PLL_CTRL0);
writel(priv->aud_pll_ctrl1, priv->mmio_base + SSPA_AUD_PLL_CTRL1);
return 0;
}
static const struct dev_pm_ops mmp2_audio_clk_pm_ops = {
SET_RUNTIME_PM_OPS(mmp2_audio_clk_suspend, mmp2_audio_clk_resume, NULL)
};
static const struct of_device_id mmp2_audio_clk_of_match[] = {
{ .compatible = "marvell,mmp2-audio-clock" },
{}
};
MODULE_DEVICE_TABLE(of, mmp2_audio_clk_of_match);
static struct platform_driver mmp2_audio_clk_driver = {
.driver = {
.name = "mmp2-audio-clock",
.of_match_table = of_match_ptr(mmp2_audio_clk_of_match),
.pm = &mmp2_audio_clk_pm_ops,
},
.probe = mmp2_audio_clk_probe,
.remove = mmp2_audio_clk_remove,
};
module_platform_driver(mmp2_audio_clk_driver);
MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
MODULE_DESCRIPTION("Clock driver for MMP2 Audio subsystem");
MODULE_LICENSE("GPL");
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