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// SPDX-License-Identifier: GPL-2.0
/*
* Amlogic Meson VPU Power Domain Controller driver
*
* Copyright (c) 2018 BayLibre, SAS.
* Author: Neil Armstrong <narmstrong@baylibre.com>
*/
#include <common.h>
#include <dm.h>
#include <power-domain-uclass.h>
#include <regmap.h>
#include <syscon.h>
#include <reset.h>
#include <clk.h>
/* AO Offsets */
#define AO_RTI_GEN_PWR_SLEEP0 (0x3a << 2)
#define GEN_PWR_VPU_HDMI BIT(8)
#define GEN_PWR_VPU_HDMI_ISO BIT(9)
/* HHI Offsets */
#define HHI_MEM_PD_REG0 (0x40 << 2)
#define HHI_VPU_MEM_PD_REG0 (0x41 << 2)
#define HHI_VPU_MEM_PD_REG1 (0x42 << 2)
struct meson_gx_pwrc_vpu_priv {
struct regmap *regmap_ao;
struct regmap *regmap_hhi;
struct reset_ctl_bulk resets;
struct clk_bulk clks;
};
static int meson_gx_pwrc_vpu_request(struct power_domain *power_domain)
{
return 0;
}
static int meson_gx_pwrc_vpu_free(struct power_domain *power_domain)
{
return 0;
}
static int meson_gx_pwrc_vpu_on(struct power_domain *power_domain)
{
struct meson_gx_pwrc_vpu_priv *priv = dev_get_priv(power_domain->dev);
int i, ret;
regmap_update_bits(priv->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
GEN_PWR_VPU_HDMI, 0);
udelay(20);
/* Power Up Memories */
for (i = 0; i < 32; i += 2) {
regmap_update_bits(priv->regmap_hhi, HHI_VPU_MEM_PD_REG0,
0x3 << i, 0);
udelay(5);
}
for (i = 0; i < 32; i += 2) {
regmap_update_bits(priv->regmap_hhi, HHI_VPU_MEM_PD_REG1,
0x3 << i, 0);
udelay(5);
}
for (i = 8; i < 16; i++) {
regmap_update_bits(priv->regmap_hhi, HHI_MEM_PD_REG0,
BIT(i), 0);
udelay(5);
}
udelay(20);
ret = reset_assert_bulk(&priv->resets);
if (ret)
return ret;
regmap_update_bits(priv->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
GEN_PWR_VPU_HDMI_ISO, 0);
ret = reset_deassert_bulk(&priv->resets);
if (ret)
return ret;
ret = clk_enable_bulk(&priv->clks);
if (ret)
return ret;
return 0;
}
static int meson_gx_pwrc_vpu_off(struct power_domain *power_domain)
{
struct meson_gx_pwrc_vpu_priv *priv = dev_get_priv(power_domain->dev);
int i;
regmap_update_bits(priv->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
GEN_PWR_VPU_HDMI_ISO, GEN_PWR_VPU_HDMI_ISO);
udelay(20);
/* Power Down Memories */
for (i = 0; i < 32; i += 2) {
regmap_update_bits(priv->regmap_hhi, HHI_VPU_MEM_PD_REG0,
0x3 << i, 0x3 << i);
udelay(5);
}
for (i = 0; i < 32; i += 2) {
regmap_update_bits(priv->regmap_hhi, HHI_VPU_MEM_PD_REG1,
0x3 << i, 0x3 << i);
udelay(5);
}
for (i = 8; i < 16; i++) {
regmap_update_bits(priv->regmap_hhi, HHI_MEM_PD_REG0,
BIT(i), BIT(i));
udelay(5);
}
udelay(20);
regmap_update_bits(priv->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
GEN_PWR_VPU_HDMI, GEN_PWR_VPU_HDMI);
mdelay(20);
clk_disable_bulk(&priv->clks);
return 0;
}
static int meson_gx_pwrc_vpu_of_xlate(struct power_domain *power_domain,
struct ofnode_phandle_args *args)
{
/* #power-domain-cells is 0 */
if (args->args_count != 0) {
debug("Invalid args_count: %d\n", args->args_count);
return -EINVAL;
}
return 0;
}
struct power_domain_ops meson_gx_pwrc_vpu_ops = {
.free = meson_gx_pwrc_vpu_free,
.off = meson_gx_pwrc_vpu_off,
.on = meson_gx_pwrc_vpu_on,
.request = meson_gx_pwrc_vpu_request,
.of_xlate = meson_gx_pwrc_vpu_of_xlate,
};
static const struct udevice_id meson_gx_pwrc_vpu_ids[] = {
{ .compatible = "amlogic,meson-gx-pwrc-vpu" },
{ }
};
static int meson_gx_pwrc_vpu_probe(struct udevice *dev)
{
struct meson_gx_pwrc_vpu_priv *priv = dev_get_priv(dev);
u32 hhi_phandle;
ofnode hhi_node;
int ret;
priv->regmap_ao = syscon_node_to_regmap(dev_get_parent(dev)->node);
if (IS_ERR(priv->regmap_ao))
return PTR_ERR(priv->regmap_ao);
ret = ofnode_read_u32(dev->node, "amlogic,hhi-sysctrl",
&hhi_phandle);
if (ret)
return ret;
hhi_node = ofnode_get_by_phandle(hhi_phandle);
if (!ofnode_valid(hhi_node))
return -EINVAL;
priv->regmap_hhi = syscon_node_to_regmap(hhi_node);
if (IS_ERR(priv->regmap_hhi))
return PTR_ERR(priv->regmap_hhi);
ret = reset_get_bulk(dev, &priv->resets);
if (ret)
return ret;
ret = clk_get_bulk(dev, &priv->clks);
if (ret)
return ret;
return 0;
}
U_BOOT_DRIVER(meson_gx_pwrc_vpu) = {
.name = "meson_gx_pwrc_vpu",
.id = UCLASS_POWER_DOMAIN,
.of_match = meson_gx_pwrc_vpu_ids,
.probe = meson_gx_pwrc_vpu_probe,
.ops = &meson_gx_pwrc_vpu_ops,
.priv_auto_alloc_size = sizeof(struct meson_gx_pwrc_vpu_priv),
};
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