u-boot/drivers/power/domain/mtk-power-domain.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 MediaTek Inc.
* Author: Ryder Lee <ryder.lee@mediatek.com>
*/
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <power-domain-uclass.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/iopoll.h>
#include <dt-bindings/power/mt7623-power.h>
#include <dt-bindings/power/mt7629-power.h>
#define SPM_EN (0xb16 << 16 | 0x1)
#define SPM_VDE_PWR_CON 0x0210
#define SPM_MFG_PWR_CON 0x0214
#define SPM_ISP_PWR_CON 0x0238
#define SPM_DIS_PWR_CON 0x023c
#define SPM_CONN_PWR_CON 0x0280
#define SPM_BDP_PWR_CON 0x029c
#define SPM_ETH_PWR_CON 0x02a0
#define SPM_HIF_PWR_CON 0x02a4
#define SPM_IFR_MSC_PWR_CON 0x02a8
#define SPM_ETHSYS_PWR_CON 0x2e0
#define SPM_HIF0_PWR_CON 0x2e4
#define SPM_HIF1_PWR_CON 0x2e8
#define SPM_PWR_STATUS 0x60c
#define SPM_PWR_STATUS_2ND 0x610
#define PWR_RST_B_BIT BIT(0)
#define PWR_ISO_BIT BIT(1)
#define PWR_ON_BIT BIT(2)
#define PWR_ON_2ND_BIT BIT(3)
#define PWR_CLK_DIS_BIT BIT(4)
#define PWR_STATUS_CONN BIT(1)
#define PWR_STATUS_DISP BIT(3)
#define PWR_STATUS_MFG BIT(4)
#define PWR_STATUS_ISP BIT(5)
#define PWR_STATUS_VDEC BIT(7)
#define PWR_STATUS_BDP BIT(14)
#define PWR_STATUS_ETH BIT(15)
#define PWR_STATUS_HIF BIT(16)
#define PWR_STATUS_IFR_MSC BIT(17)
#define PWR_STATUS_ETHSYS BIT(24)
#define PWR_STATUS_HIF0 BIT(25)
#define PWR_STATUS_HIF1 BIT(26)
/* Infrasys configuration */
#define INFRA_TOPDCM_CTRL 0x10
#define INFRA_TOPAXI_PROT_EN 0x220
#define INFRA_TOPAXI_PROT_STA1 0x228
#define DCM_TOP_EN BIT(0)
enum scp_domain_type {
SCPSYS_MT7622,
SCPSYS_MT7623,
SCPSYS_MT7629,
};
struct scp_domain;
struct scp_domain_data {
struct scp_domain *scpd;
u32 sta_mask;
int ctl_offs;
u32 sram_pdn_bits;
u32 sram_pdn_ack_bits;
u32 bus_prot_mask;
};
struct scp_domain {
void __iomem *base;
void __iomem *infracfg;
enum scp_domain_type type;
struct scp_domain_data *data;
};
static struct scp_domain_data scp_domain_mt7623[] = {
[MT7623_POWER_DOMAIN_CONN] = {
.sta_mask = PWR_STATUS_CONN,
.ctl_offs = SPM_CONN_PWR_CON,
.bus_prot_mask = BIT(8) | BIT(2),
},
[MT7623_POWER_DOMAIN_DISP] = {
.sta_mask = PWR_STATUS_DISP,
.ctl_offs = SPM_DIS_PWR_CON,
.sram_pdn_bits = GENMASK(11, 8),
.bus_prot_mask = BIT(2),
},
[MT7623_POWER_DOMAIN_MFG] = {
.sta_mask = PWR_STATUS_MFG,
.ctl_offs = SPM_MFG_PWR_CON,
.sram_pdn_bits = GENMASK(11, 8),
.sram_pdn_ack_bits = GENMASK(12, 12),
},
[MT7623_POWER_DOMAIN_VDEC] = {
.sta_mask = PWR_STATUS_VDEC,
.ctl_offs = SPM_VDE_PWR_CON,
.sram_pdn_bits = GENMASK(11, 8),
.sram_pdn_ack_bits = GENMASK(12, 12),
},
[MT7623_POWER_DOMAIN_ISP] = {
.sta_mask = PWR_STATUS_ISP,
.ctl_offs = SPM_ISP_PWR_CON,
.sram_pdn_bits = GENMASK(11, 8),
.sram_pdn_ack_bits = GENMASK(13, 12),
},
[MT7623_POWER_DOMAIN_BDP] = {
.sta_mask = PWR_STATUS_BDP,
.ctl_offs = SPM_BDP_PWR_CON,
.sram_pdn_bits = GENMASK(11, 8),
},
[MT7623_POWER_DOMAIN_ETH] = {
.sta_mask = PWR_STATUS_ETH,
.ctl_offs = SPM_ETH_PWR_CON,
.sram_pdn_bits = GENMASK(11, 8),
.sram_pdn_ack_bits = GENMASK(15, 12),
},
[MT7623_POWER_DOMAIN_HIF] = {
.sta_mask = PWR_STATUS_HIF,
.ctl_offs = SPM_HIF_PWR_CON,
.sram_pdn_bits = GENMASK(11, 8),
.sram_pdn_ack_bits = GENMASK(15, 12),
},
[MT7623_POWER_DOMAIN_IFR_MSC] = {
.sta_mask = PWR_STATUS_IFR_MSC,
.ctl_offs = SPM_IFR_MSC_PWR_CON,
},
};
static struct scp_domain_data scp_domain_mt7629[] = {
[MT7629_POWER_DOMAIN_ETHSYS] = {
.sta_mask = PWR_STATUS_ETHSYS,
.ctl_offs = SPM_ETHSYS_PWR_CON,
.sram_pdn_bits = GENMASK(11, 8),
.sram_pdn_ack_bits = GENMASK(15, 12),
.bus_prot_mask = (BIT(3) | BIT(17)),
},
[MT7629_POWER_DOMAIN_HIF0] = {
.sta_mask = PWR_STATUS_HIF0,
.ctl_offs = SPM_HIF0_PWR_CON,
.sram_pdn_bits = GENMASK(11, 8),
.sram_pdn_ack_bits = GENMASK(15, 12),
.bus_prot_mask = GENMASK(25, 24),
},
[MT7629_POWER_DOMAIN_HIF1] = {
.sta_mask = PWR_STATUS_HIF1,
.ctl_offs = SPM_HIF1_PWR_CON,
.sram_pdn_bits = GENMASK(11, 8),
.sram_pdn_ack_bits = GENMASK(15, 12),
.bus_prot_mask = GENMASK(28, 26),
},
};
/**
* This function enables the bus protection bits for disabled power
* domains so that the system does not hang when some unit accesses the
* bus while in power down.
*/
static int mtk_infracfg_set_bus_protection(void __iomem *infracfg,
u32 mask)
{
u32 val;
clrsetbits_le32(infracfg + INFRA_TOPAXI_PROT_EN, mask, mask);
return readl_poll_timeout(infracfg + INFRA_TOPAXI_PROT_STA1, val,
(val & mask) == mask, 100);
}
static int mtk_infracfg_clear_bus_protection(void __iomem *infracfg,
u32 mask)
{
u32 val;
clrbits_le32(infracfg + INFRA_TOPAXI_PROT_EN, mask);
return readl_poll_timeout(infracfg + INFRA_TOPAXI_PROT_STA1, val,
!(val & mask), 100);
}
static int scpsys_domain_is_on(struct scp_domain_data *data)
{
struct scp_domain *scpd = data->scpd;
u32 sta = readl(scpd->base + SPM_PWR_STATUS) &
data->sta_mask;
u32 sta2 = readl(scpd->base + SPM_PWR_STATUS_2ND) &
data->sta_mask;
/*
* A domain is on when both status bits are set. If only one is set
* return an error. This happens while powering up a domain
*/
if (sta && sta2)
return true;
if (!sta && !sta2)
return false;
return -EINVAL;
}
static int scpsys_power_on(struct power_domain *power_domain)
{
struct scp_domain *scpd = dev_get_priv(power_domain->dev);
struct scp_domain_data *data = &scpd->data[power_domain->id];
void __iomem *ctl_addr = scpd->base + data->ctl_offs;
u32 pdn_ack = data->sram_pdn_ack_bits;
u32 val;
int ret, tmp;
writel(SPM_EN, scpd->base);
val = readl(ctl_addr);
val |= PWR_ON_BIT;
writel(val, ctl_addr);
val |= PWR_ON_2ND_BIT;
writel(val, ctl_addr);
ret = readx_poll_timeout(scpsys_domain_is_on, data, tmp, tmp > 0,
100);
if (ret < 0)
return ret;
val &= ~PWR_CLK_DIS_BIT;
writel(val, ctl_addr);
val &= ~PWR_ISO_BIT;
writel(val, ctl_addr);
val |= PWR_RST_B_BIT;
writel(val, ctl_addr);
val &= ~data->sram_pdn_bits;
writel(val, ctl_addr);
ret = readl_poll_timeout(ctl_addr, tmp, !(tmp & pdn_ack), 100);
if (ret < 0)
return ret;
if (data->bus_prot_mask) {
ret = mtk_infracfg_clear_bus_protection(scpd->infracfg,
data->bus_prot_mask);
if (ret)
return ret;
}
return 0;
}
static int scpsys_power_off(struct power_domain *power_domain)
{
struct scp_domain *scpd = dev_get_priv(power_domain->dev);
struct scp_domain_data *data = &scpd->data[power_domain->id];
void __iomem *ctl_addr = scpd->base + data->ctl_offs;
u32 pdn_ack = data->sram_pdn_ack_bits;
u32 val;
int ret, tmp;
if (data->bus_prot_mask) {
ret = mtk_infracfg_set_bus_protection(scpd->infracfg,
data->bus_prot_mask);
if (ret)
return ret;
}
val = readl(ctl_addr);
val |= data->sram_pdn_bits;
writel(val, ctl_addr);
ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == pdn_ack,
100);
if (ret < 0)
return ret;
val |= PWR_ISO_BIT;
writel(val, ctl_addr);
val &= ~PWR_RST_B_BIT;
writel(val, ctl_addr);
val |= PWR_CLK_DIS_BIT;
writel(val, ctl_addr);
val &= ~PWR_ON_BIT;
writel(val, ctl_addr);
val &= ~PWR_ON_2ND_BIT;
writel(val, ctl_addr);
ret = readx_poll_timeout(scpsys_domain_is_on, data, tmp, !tmp, 100);
if (ret < 0)
return ret;
return 0;
}
static int scpsys_power_request(struct power_domain *power_domain)
{
struct scp_domain *scpd = dev_get_priv(power_domain->dev);
struct scp_domain_data *data;
data = &scpd->data[power_domain->id];
data->scpd = scpd;
return 0;
}
static int mtk_power_domain_hook(struct udevice *dev)
{
struct scp_domain *scpd = dev_get_priv(dev);
scpd->type = (enum scp_domain_type)dev_get_driver_data(dev);
switch (scpd->type) {
case SCPSYS_MT7623:
scpd->data = scp_domain_mt7623;
break;
case SCPSYS_MT7622:
case SCPSYS_MT7629:
scpd->data = scp_domain_mt7629;
break;
default:
return -EINVAL;
}
return 0;
}
static int mtk_power_domain_probe(struct udevice *dev)
{
struct ofnode_phandle_args args;
struct scp_domain *scpd = dev_get_priv(dev);
struct regmap *regmap;
struct clk_bulk bulk;
int err;
scpd->base = dev_read_addr_ptr(dev);
if (!scpd->base)
return -ENOENT;
err = mtk_power_domain_hook(dev);
if (err)
return err;
/* get corresponding syscon phandle */
err = dev_read_phandle_with_args(dev, "infracfg", NULL, 0, 0, &args);
if (err)
return err;
regmap = syscon_node_to_regmap(args.node);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
scpd->infracfg = regmap_get_range(regmap, 0);
if (!scpd->infracfg)
return -ENOENT;
/* enable Infra DCM */
setbits_le32(scpd->infracfg + INFRA_TOPDCM_CTRL, DCM_TOP_EN);
err = clk_get_bulk(dev, &bulk);
if (err)
return err;
return clk_enable_bulk(&bulk);
}
static const struct udevice_id mtk_power_domain_ids[] = {
{
.compatible = "mediatek,mt7622-scpsys",
.data = SCPSYS_MT7622,
},
{
.compatible = "mediatek,mt7623-scpsys",
.data = SCPSYS_MT7623,
},
{
.compatible = "mediatek,mt7629-scpsys",
.data = SCPSYS_MT7629,
},
{ /* sentinel */ }
};
struct power_domain_ops mtk_power_domain_ops = {
.off = scpsys_power_off,
.on = scpsys_power_on,
.request = scpsys_power_request,
};
U_BOOT_DRIVER(mtk_power_domain) = {
.name = "mtk_power_domain",
.id = UCLASS_POWER_DOMAIN,
.ops = &mtk_power_domain_ops,
.probe = mtk_power_domain_probe,
.of_match = mtk_power_domain_ids,
.priv_auto = sizeof(struct scp_domain),
};