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linux-zen-desktop/drivers/soc/bcm/bcm63xx/bcm-pmb.c

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Initial commit
2023-08-30 17:31:07 +02:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2013 Broadcom
* Copyright (C) 2020 Rafał Miłecki <rafal@milecki.pl>
*/
#include <dt-bindings/soc/bcm-pmb.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/reset/bcm63xx_pmb.h>
#define BPCM_ID_REG 0x00
#define BPCM_CAPABILITIES 0x04
#define BPCM_CAP_NUM_ZONES 0x000000ff
#define BPCM_CAP_SR_REG_BITS 0x0000ff00
#define BPCM_CAP_PLLTYPE 0x00030000
#define BPCM_CAP_UBUS 0x00080000
#define BPCM_CONTROL 0x08
#define BPCM_STATUS 0x0c
#define BPCM_ROSC_CONTROL 0x10
#define BPCM_ROSC_THRESH_H 0x14
#define BPCM_ROSC_THRESHOLD_BCM6838 0x14
#define BPCM_ROSC_THRESH_S 0x18
#define BPCM_ROSC_COUNT_BCM6838 0x18
#define BPCM_ROSC_COUNT 0x1c
#define BPCM_PWD_CONTROL_BCM6838 0x1c
#define BPCM_PWD_CONTROL 0x20
#define BPCM_SR_CONTROL_BCM6838 0x20
#define BPCM_PWD_ACCUM_CONTROL 0x24
#define BPCM_SR_CONTROL 0x28
#define BPCM_GLOBAL_CONTROL 0x2c
#define BPCM_MISC_CONTROL 0x30
#define BPCM_MISC_CONTROL2 0x34
#define BPCM_SGPHY_CNTL 0x38
#define BPCM_SGPHY_STATUS 0x3c
#define BPCM_ZONE0 0x40
#define BPCM_ZONE_CONTROL 0x00
#define BPCM_ZONE_CONTROL_MANUAL_CLK_EN 0x00000001
#define BPCM_ZONE_CONTROL_MANUAL_RESET_CTL 0x00000002
#define BPCM_ZONE_CONTROL_FREQ_SCALE_USED 0x00000004 /* R/O */
#define BPCM_ZONE_CONTROL_DPG_CAPABLE 0x00000008 /* R/O */
#define BPCM_ZONE_CONTROL_MANUAL_MEM_PWR 0x00000030
#define BPCM_ZONE_CONTROL_MANUAL_ISO_CTL 0x00000040
#define BPCM_ZONE_CONTROL_MANUAL_CTL 0x00000080
#define BPCM_ZONE_CONTROL_DPG_CTL_EN 0x00000100
#define BPCM_ZONE_CONTROL_PWR_DN_REQ 0x00000200
#define BPCM_ZONE_CONTROL_PWR_UP_REQ 0x00000400
#define BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN 0x00000800
#define BPCM_ZONE_CONTROL_BLK_RESET_ASSERT 0x00001000
#define BPCM_ZONE_CONTROL_MEM_STBY 0x00002000
#define BPCM_ZONE_CONTROL_RESERVED 0x0007c000
#define BPCM_ZONE_CONTROL_PWR_CNTL_STATE 0x00f80000
#define BPCM_ZONE_CONTROL_FREQ_SCALAR_DYN_SEL 0x01000000 /* R/O */
#define BPCM_ZONE_CONTROL_PWR_OFF_STATE 0x02000000 /* R/O */
#define BPCM_ZONE_CONTROL_PWR_ON_STATE 0x04000000 /* R/O */
#define BPCM_ZONE_CONTROL_PWR_GOOD 0x08000000 /* R/O */
#define BPCM_ZONE_CONTROL_DPG_PWR_STATE 0x10000000 /* R/O */
#define BPCM_ZONE_CONTROL_MEM_PWR_STATE 0x20000000 /* R/O */
#define BPCM_ZONE_CONTROL_ISO_STATE 0x40000000 /* R/O */
#define BPCM_ZONE_CONTROL_RESET_STATE 0x80000000 /* R/O */
#define BPCM_ZONE_CONFIG1 0x04
#define BPCM_ZONE_CONFIG2 0x08
#define BPCM_ZONE_FREQ_SCALAR_CONTROL 0x0c
#define BPCM_ZONE_SIZE 0x10
struct bcm_pmb {
struct device *dev;
void __iomem *base;
spinlock_t lock;
bool little_endian;
struct genpd_onecell_data genpd_onecell_data;
};
struct bcm_pmb_pd_data {
const char * const name;
int id;
u8 bus;
u8 device;
};
struct bcm_pmb_pm_domain {
struct bcm_pmb *pmb;
const struct bcm_pmb_pd_data *data;
struct generic_pm_domain genpd;
};
static int bcm_pmb_bpcm_read(struct bcm_pmb *pmb, int bus, u8 device,
int offset, u32 *val)
{
void __iomem *base = pmb->base + bus * 0x20;
unsigned long flags;
int err;
spin_lock_irqsave(&pmb->lock, flags);
err = bpcm_rd(base, device, offset, val);
spin_unlock_irqrestore(&pmb->lock, flags);
if (!err)
*val = pmb->little_endian ? le32_to_cpu(*val) : be32_to_cpu(*val);
return err;
}
static int bcm_pmb_bpcm_write(struct bcm_pmb *pmb, int bus, u8 device,
int offset, u32 val)
{
void __iomem *base = pmb->base + bus * 0x20;
unsigned long flags;
int err;
val = pmb->little_endian ? cpu_to_le32(val) : cpu_to_be32(val);
spin_lock_irqsave(&pmb->lock, flags);
err = bpcm_wr(base, device, offset, val);
spin_unlock_irqrestore(&pmb->lock, flags);
return err;
}
static int bcm_pmb_power_off_zone(struct bcm_pmb *pmb, int bus, u8 device,
int zone)
{
int offset;
u32 val;
int err;
offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL;
err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
if (err)
return err;
val |= BPCM_ZONE_CONTROL_PWR_DN_REQ;
val &= ~BPCM_ZONE_CONTROL_PWR_UP_REQ;
err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
return err;
}
static int bcm_pmb_power_on_zone(struct bcm_pmb *pmb, int bus, u8 device,
int zone)
{
int offset;
u32 val;
int err;
offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL;
err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
if (err)
return err;
if (!(val & BPCM_ZONE_CONTROL_PWR_ON_STATE)) {
val &= ~BPCM_ZONE_CONTROL_PWR_DN_REQ;
val |= BPCM_ZONE_CONTROL_DPG_CTL_EN;
val |= BPCM_ZONE_CONTROL_PWR_UP_REQ;
val |= BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN;
val |= BPCM_ZONE_CONTROL_BLK_RESET_ASSERT;
err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
}
return err;
}
static int bcm_pmb_power_off_device(struct bcm_pmb *pmb, int bus, u8 device)
{
int offset;
u32 val;
int err;
/* Entire device can be powered off by powering off the 0th zone */
offset = BPCM_ZONE0 + BPCM_ZONE_CONTROL;
err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
if (err)
return err;
if (!(val & BPCM_ZONE_CONTROL_PWR_OFF_STATE)) {
val = BPCM_ZONE_CONTROL_PWR_DN_REQ;
err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
}
return err;
}
static int bcm_pmb_power_on_device(struct bcm_pmb *pmb, int bus, u8 device)
{
u32 val;
int err;
int i;
err = bcm_pmb_bpcm_read(pmb, bus, device, BPCM_CAPABILITIES, &val);
if (err)
return err;
for (i = 0; i < (val & BPCM_CAP_NUM_ZONES); i++) {
err = bcm_pmb_power_on_zone(pmb, bus, device, i);
if (err)
return err;
}
return err;
}
static int bcm_pmb_power_on_sata(struct bcm_pmb *pmb, int bus, u8 device)
{
int err;
err = bcm_pmb_power_on_zone(pmb, bus, device, 0);
if (err)
return err;
/* Does not apply to the BCM963158 */
err = bcm_pmb_bpcm_write(pmb, bus, device, BPCM_MISC_CONTROL, 0);
if (err)
return err;
err = bcm_pmb_bpcm_write(pmb, bus, device, BPCM_SR_CONTROL, 0xffffffff);
if (err)
return err;
err = bcm_pmb_bpcm_write(pmb, bus, device, BPCM_SR_CONTROL, 0);
return err;
}
static int bcm_pmb_power_on(struct generic_pm_domain *genpd)
{
struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd);
const struct bcm_pmb_pd_data *data = pd->data;
struct bcm_pmb *pmb = pd->pmb;
switch (data->id) {
case BCM_PMB_PCIE0:
case BCM_PMB_PCIE1:
case BCM_PMB_PCIE2:
return bcm_pmb_power_on_zone(pmb, data->bus, data->device, 0);
case BCM_PMB_HOST_USB:
return bcm_pmb_power_on_device(pmb, data->bus, data->device);
case BCM_PMB_SATA:
return bcm_pmb_power_on_sata(pmb, data->bus, data->device);
default:
dev_err(pmb->dev, "unsupported device id: %d\n", data->id);
return -EINVAL;
}
}
static int bcm_pmb_power_off(struct generic_pm_domain *genpd)
{
struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd);
const struct bcm_pmb_pd_data *data = pd->data;
struct bcm_pmb *pmb = pd->pmb;
switch (data->id) {
case BCM_PMB_PCIE0:
case BCM_PMB_PCIE1:
case BCM_PMB_PCIE2:
return bcm_pmb_power_off_zone(pmb, data->bus, data->device, 0);
case BCM_PMB_HOST_USB:
return bcm_pmb_power_off_device(pmb, data->bus, data->device);
default:
dev_err(pmb->dev, "unsupported device id: %d\n", data->id);
return -EINVAL;
}
}
static int bcm_pmb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct bcm_pmb_pd_data *table;
const struct bcm_pmb_pd_data *e;
struct bcm_pmb *pmb;
int max_id;
int err;
pmb = devm_kzalloc(dev, sizeof(*pmb), GFP_KERNEL);
if (!pmb)
return -ENOMEM;
pmb->dev = dev;
pmb->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(pmb->base))
return PTR_ERR(pmb->base);
spin_lock_init(&pmb->lock);
pmb->little_endian = !of_device_is_big_endian(dev->of_node);
table = of_device_get_match_data(dev);
if (!table)
return -EINVAL;
max_id = 0;
for (e = table; e->name; e++)
max_id = max(max_id, e->id);
pmb->genpd_onecell_data.num_domains = max_id + 1;
pmb->genpd_onecell_data.domains =
devm_kcalloc(dev, pmb->genpd_onecell_data.num_domains,
sizeof(struct generic_pm_domain *), GFP_KERNEL);
if (!pmb->genpd_onecell_data.domains)
return -ENOMEM;
for (e = table; e->name; e++) {
struct bcm_pmb_pm_domain *pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
if (!pd)
return -ENOMEM;
pd->pmb = pmb;
pd->data = e;
pd->genpd.name = e->name;
pd->genpd.power_on = bcm_pmb_power_on;
pd->genpd.power_off = bcm_pmb_power_off;
pm_genpd_init(&pd->genpd, NULL, true);
pmb->genpd_onecell_data.domains[e->id] = &pd->genpd;
}
err = of_genpd_add_provider_onecell(dev->of_node, &pmb->genpd_onecell_data);
if (err) {
dev_err(dev, "failed to add genpd provider: %d\n", err);
return err;
}
return 0;
}
static const struct bcm_pmb_pd_data bcm_pmb_bcm4908_data[] = {
{ .name = "pcie2", .id = BCM_PMB_PCIE2, .bus = 0, .device = 2, },
{ .name = "pcie0", .id = BCM_PMB_PCIE0, .bus = 1, .device = 14, },
{ .name = "pcie1", .id = BCM_PMB_PCIE1, .bus = 1, .device = 15, },
{ .name = "usb", .id = BCM_PMB_HOST_USB, .bus = 1, .device = 17, },
{ },
};
static const struct bcm_pmb_pd_data bcm_pmb_bcm63138_data[] = {
{ .name = "sata", .id = BCM_PMB_SATA, .bus = 0, .device = 3, },
{ },
};
static const struct of_device_id bcm_pmb_of_match[] = {
{ .compatible = "brcm,bcm4908-pmb", .data = &bcm_pmb_bcm4908_data, },
{ .compatible = "brcm,bcm63138-pmb", .data = &bcm_pmb_bcm63138_data, },
{ },
};
static struct platform_driver bcm_pmb_driver = {
.driver = {
.name = "bcm-pmb",
.of_match_table = bcm_pmb_of_match,
},
.probe = bcm_pmb_probe,
};
builtin_platform_driver(bcm_pmb_driver);