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// SPDX-License-Identifier: GPL-2.0
/*
* i.MX8 MEDIAMIX control block driver
* Copyright (C) 2024 Miquel Raynal <miquel.raynal@bootlin.com>
* Inspired from Marek Vasut <marex@denx.de> work on the hsiomix driver.
*/
#include <asm/io.h>
#include <clk.h>
#include <dm.h>
#include <power-domain-uclass.h>
#include <linux/delay.h>
#include <dt-bindings/power/imx8mp-power.h>
#define BLK_SFT_RSTN 0x0
#define BLK_CLK_EN 0x4
struct imx8mp_mediamix_priv {
void __iomem *base;
struct clk clk_apb;
struct clk clk_axi;
struct clk clk_disp2;
struct power_domain pd_bus;
struct power_domain pd_lcdif2;
};
static int imx8mp_mediamix_on(struct power_domain *power_domain)
{
struct udevice *dev = power_domain->dev;
struct imx8mp_mediamix_priv *priv = dev_get_priv(dev);
struct power_domain *domain;
struct clk *clk;
u32 reset;
int ret;
switch (power_domain->id) {
case IMX8MP_MEDIABLK_PD_LCDIF_2:
domain = &priv->pd_lcdif2;
clk = &priv->clk_disp2;
reset = BIT(11) | BIT(12) | BIT(24);
break;
default:
return -EINVAL;
}
/* Make sure bus domain is awake */
ret = power_domain_on(&priv->pd_bus);
if (ret)
return ret;
/* Put devices into reset */
clrbits_le32(priv->base + BLK_SFT_RSTN, reset);
/* Enable upstream clocks */
ret = clk_enable(&priv->clk_apb);
if (ret)
goto dis_bus_pd;
ret = clk_enable(&priv->clk_axi);
if (ret)
goto dis_apb_clk;
/* Enable blk-ctrl clock to allow reset to propagate */
ret = clk_enable(clk);
if (ret)
goto dis_axi_clk;
setbits_le32(priv->base + BLK_CLK_EN, reset);
/* Power up upstream GPC domain */
ret = power_domain_on(domain);
if (ret)
goto dis_lcdif_clk;
/* Wait for reset to propagate */
udelay(5);
/* Release reset */
setbits_le32(priv->base + BLK_SFT_RSTN, reset);
return 0;
dis_lcdif_clk:
clk_disable(clk);
dis_axi_clk:
clk_disable(&priv->clk_axi);
dis_apb_clk:
clk_disable(&priv->clk_apb);
dis_bus_pd:
power_domain_off(&priv->pd_bus);
return ret;
}
static int imx8mp_mediamix_off(struct power_domain *power_domain)
{
struct udevice *dev = power_domain->dev;
struct imx8mp_mediamix_priv *priv = dev_get_priv(dev);
struct power_domain *domain;
struct clk *clk;
u32 reset;
switch (power_domain->id) {
case IMX8MP_MEDIABLK_PD_LCDIF_2:
domain = &priv->pd_lcdif2;
clk = &priv->clk_disp2;
reset = BIT(11) | BIT(12) | BIT(24);
break;
default:
return -EINVAL;
}
/* Put devices into reset and disable clocks */
clrbits_le32(priv->base + BLK_SFT_RSTN, reset);
clrbits_le32(priv->base + BLK_CLK_EN, reset);
/* Power down upstream GPC domain */
power_domain_off(domain);
clk_disable(clk);
clk_disable(&priv->clk_axi);
clk_disable(&priv->clk_apb);
/* Allow bus domain to suspend */
power_domain_off(&priv->pd_bus);
return 0;
}
static int imx8mp_mediamix_of_xlate(struct power_domain *power_domain,
struct ofnode_phandle_args *args)
{
power_domain->id = args->args[0];
return 0;
}
static int imx8mp_mediamix_bind(struct udevice *dev)
{
/* Bind child lcdif */
return dm_scan_fdt_dev(dev);
}
static int imx8mp_mediamix_probe(struct udevice *dev)
{
struct power_domain_plat *plat = dev_get_uclass_plat(dev);
struct imx8mp_mediamix_priv *priv = dev_get_priv(dev);
int ret;
/* Definitions are in imx8mp-power.h */
plat->subdomains = 9;
priv->base = dev_read_addr_ptr(dev);
ret = clk_get_by_name(dev, "apb", &priv->clk_apb);
if (ret < 0)
return ret;
ret = clk_get_by_name(dev, "axi", &priv->clk_axi);
if (ret < 0)
return ret;
ret = clk_get_by_name(dev, "disp2", &priv->clk_disp2);
if (ret < 0)
return ret;
ret = power_domain_get_by_name(dev, &priv->pd_bus, "bus");
if (ret < 0)
return ret;
ret = power_domain_get_by_name(dev, &priv->pd_lcdif2, "lcdif2");
if (ret < 0)
goto free_bus_pd;
return 0;
free_bus_pd:
power_domain_free(&priv->pd_bus);
return ret;
}
static int imx8mp_mediamix_remove(struct udevice *dev)
{
struct imx8mp_mediamix_priv *priv = dev_get_priv(dev);
power_domain_free(&priv->pd_lcdif2);
power_domain_free(&priv->pd_bus);
return 0;
}
static const struct udevice_id imx8mp_mediamix_ids[] = {
{ .compatible = "fsl,imx8mp-media-blk-ctrl" },
{ }
};
struct power_domain_ops imx8mp_mediamix_ops = {
.on = imx8mp_mediamix_on,
.off = imx8mp_mediamix_off,
.of_xlate = imx8mp_mediamix_of_xlate,
};
U_BOOT_DRIVER(imx8mp_mediamix) = {
.name = "imx8mp_mediamix",
.id = UCLASS_POWER_DOMAIN,
.of_match = imx8mp_mediamix_ids,
.bind = imx8mp_mediamix_bind,
.probe = imx8mp_mediamix_probe,
.remove = imx8mp_mediamix_remove,
.priv_auto = sizeof(struct imx8mp_mediamix_priv),
.ops = &imx8mp_mediamix_ops,
};
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