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reset: eyeq: add platform driver

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Add Mobileye EyeQ reset controller driver, for EyeQ5, EyeQ6L and EyeQ6H
SoCs. Instances belong to a shared register region called OLB and gets
spawned as auxiliary device to the platform driver for clock.

There is one OLB instance for EyeQ5 and EyeQ6L. There are seven OLB
instances on EyeQ6H; three have a reset controller embedded:
 - West and east get handled by the same compatible.
 - Acc (accelerator) is another one.

Each instance vary in the number and types of reset domains.
Instances with single domain expect a single cell, others two.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Link: https://lore.kernel.org/r/20240730-mbly-reset-v2-2-00b870a6a2ff@bootlin.com
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Théo Lebrun 2024-07-30 18:06:23 +02:00 committed by Philipp Zabel
parent ce50a775bd
commit 487b1b32e3
3 changed files with 584 additions and 0 deletions
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13
drivers/reset/Kconfig
View File

@ -66,6 +66,19 @@ config RESET_BRCMSTB_RESCAL
This enables the RESCAL reset controller for SATA, PCIe0, or PCIe1 on
BCM7216.
config RESET_EYEQ
bool "Mobileye EyeQ reset controller"
depends on MACH_EYEQ5 || MACH_EYEQ6H || COMPILE_TEST
select AUXILIARY_BUS
default MACH_EYEQ5 || MACH_EYEQ6H
help
This enables the Mobileye EyeQ reset controller, used in EyeQ5, EyeQ6L
and EyeQ6H SoCs.
It has one or more domains, with a varying number of resets in each.
Registers are located in a shared register region called OLB. EyeQ6H
has multiple reset instances.
config RESET_GPIO
tristate "GPIO reset controller"
depends on GPIOLIB

1
drivers/reset/Makefile
View File

@ -11,6 +11,7 @@ obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o
obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
obj-$(CONFIG_RESET_BRCMSTB) += reset-brcmstb.o
obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o
obj-$(CONFIG_RESET_EYEQ) += reset-eyeq.o
obj-$(CONFIG_RESET_GPIO) += reset-gpio.o
obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
obj-$(CONFIG_RESET_IMX7) += reset-imx7.o

570
drivers/reset/reset-eyeq.c Normal file
View File

@ -0,0 +1,570 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Reset driver for the Mobileye EyeQ5, EyeQ6L and EyeQ6H platforms.
*
* Controllers live in a shared register region called OLB. EyeQ5 and EyeQ6L
* have a single OLB instance for a single reset controller. EyeQ6H has seven
* OLB instances; three host reset controllers.
*
* Each reset controller has one or more domain. Domains are of a given type
* (see enum eqr_domain_type), with a valid offset mask (up to 32 resets per
* domain).
*
* Domain types define expected behavior: one-register-per-reset,
* one-bit-per-reset, status detection method, busywait duration, etc.
*
* We use eqr_ as prefix, as-in "EyeQ Reset", but way shorter.
*
* Known resets in EyeQ5 domain 0 (type EQR_EYEQ5_SARCR):
* 3. CAN0 4. CAN1 5. CAN2 6. SPI0
* 7. SPI1 8. SPI2 9. SPI3 10. UART0
* 11. UART1 12. UART2 13. I2C0 14. I2C1
* 15. I2C2 16. I2C3 17. I2C4 18. TIMER0
* 19. TIMER1 20. TIMER2 21. TIMER3 22. TIMER4
* 23. WD0 24. EXT0 25. EXT1 26. GPIO
* 27. WD1
*
* Known resets in EyeQ5 domain 1 (type EQR_EYEQ5_ACRP):
* 0. VMP0 1. VMP1 2. VMP2 3. VMP3
* 4. PMA0 5. PMA1 6. PMAC0 7. PMAC1
* 8. MPC0 9. MPC1 10. MPC2 11. MPC3
* 12. MPC4
*
* Known resets in EyeQ5 domain 2 (type EQR_EYEQ5_PCIE):
* 0. PCIE0_CORE 1. PCIE0_APB 2. PCIE0_LINK_AXI 3. PCIE0_LINK_MGMT
* 4. PCIE0_LINK_HOT 5. PCIE0_LINK_PIPE 6. PCIE1_CORE 7. PCIE1_APB
* 8. PCIE1_LINK_AXI 9. PCIE1_LINK_MGMT 10. PCIE1_LINK_HOT 11. PCIE1_LINK_PIPE
* 12. MULTIPHY 13. MULTIPHY_APB 15. PCIE0_LINK_MGMT 16. PCIE1_LINK_MGMT
* 17. PCIE0_LINK_PM 18. PCIE1_LINK_PM
*
* Known resets in EyeQ6L domain 0 (type EQR_EYEQ5_SARCR):
* 0. SPI0 1. SPI1 2. UART0 3. I2C0
* 4. I2C1 5. TIMER0 6. TIMER1 7. TIMER2
* 8. TIMER3 9. WD0 10. WD1 11. EXT0
* 12. EXT1 13. GPIO
*
* Known resets in EyeQ6L domain 1 (type EQR_EYEQ5_ACRP):
* 0. VMP0 1. VMP1 2. VMP2 3. VMP3
* 4. PMA0 5. PMA1 6. PMAC0 7. PMAC1
* 8. MPC0 9. MPC1 10. MPC2 11. MPC3
* 12. MPC4
*
* Known resets in EyeQ6H west/east (type EQR_EYEQ6H_SARCR):
* 0. CAN 1. SPI0 2. SPI1 3. UART0
* 4. UART1 5. I2C0 6. I2C1 7. -hole-
* 8. TIMER0 9. TIMER1 10. WD 11. EXT TIMER
* 12. GPIO
*
* Known resets in EyeQ6H acc (type EQR_EYEQ5_ACRP):
* 1. XNN0 2. XNN1 3. XNN2 4. XNN3
* 5. VMP0 6. VMP1 7. VMP2 8. VMP3
* 9. PMA0 10. PMA1 11. MPC0 12. MPC1
* 13. MPC2 14. MPC3 15. PERIPH
*
* Abbreviations:
* - PMA: Programmable Macro Array
* - MPC: Multi-threaded Processing Clusters
* - VMP: Vector Microcode Processors
*
* Copyright (C) 2024 Mobileye Vision Technologies Ltd.
*/
#include <linux/array_size.h>
#include <linux/auxiliary_bus.h>
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/bug.h>
#include <linux/cleanup.h>
#include <linux/container_of.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/lockdep.h>
#include <linux/mod_devicetable.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
#include <linux/types.h>
/*
* A reset ID, as returned by eqr_of_xlate_*(), is a (domain, offset) pair.
* Low byte is domain, rest is offset.
*/
#define ID_DOMAIN_MASK GENMASK(7, 0)
#define ID_OFFSET_MASK GENMASK(31, 8)
enum eqr_domain_type {
EQR_EYEQ5_SARCR,
EQR_EYEQ5_ACRP,
EQR_EYEQ5_PCIE,
EQR_EYEQ6H_SARCR,
};
/*
* Domain type EQR_EYEQ5_SARCR register offsets.
*/
#define EQR_EYEQ5_SARCR_REQUEST (0x000)
#define EQR_EYEQ5_SARCR_STATUS (0x004)
/*
* Domain type EQR_EYEQ5_ACRP register masks.
* Registers are: base + 4 * offset.
*/
#define EQR_EYEQ5_ACRP_PD_REQ BIT(0)
#define EQR_EYEQ5_ACRP_ST_POWER_DOWN BIT(27)
#define EQR_EYEQ5_ACRP_ST_ACTIVE BIT(29)
/*
* Domain type EQR_EYEQ6H_SARCR register offsets.
*/
#define EQR_EYEQ6H_SARCR_RST_REQUEST (0x000)
#define EQR_EYEQ6H_SARCR_CLK_STATUS (0x004)
#define EQR_EYEQ6H_SARCR_RST_STATUS (0x008)
#define EQR_EYEQ6H_SARCR_CLK_REQUEST (0x00C)
struct eqr_busy_wait_timings {
unsigned long sleep_us;
unsigned long timeout_us;
};
static const struct eqr_busy_wait_timings eqr_timings[] = {
[EQR_EYEQ5_SARCR] = {1, 10},
[EQR_EYEQ5_ACRP] = {1, 40 * USEC_PER_MSEC}, /* LBIST implies long timeout. */
/* EQR_EYEQ5_PCIE does no busy waiting. */
[EQR_EYEQ6H_SARCR] = {1, 400},
};
#define EQR_MAX_DOMAIN_COUNT 3
struct eqr_domain_descriptor {
enum eqr_domain_type type;
u32 valid_mask;
unsigned int offset;
};
struct eqr_match_data {
unsigned int domain_count;
const struct eqr_domain_descriptor *domains;
};
struct eqr_private {
/*
* One mutex per domain for read-modify-write operations on registers.
* Some domains can be involved in LBIST which implies long critical
* sections; we wouldn't want other domains to be impacted by that.
*/
struct mutex mutexes[EQR_MAX_DOMAIN_COUNT];
void __iomem *base;
const struct eqr_match_data *data;
struct reset_controller_dev rcdev;
};
static inline struct eqr_private *eqr_rcdev_to_priv(struct reset_controller_dev *x)
{
return container_of(x, struct eqr_private, rcdev);
}
static u32 eqr_double_readl(void __iomem *addr_a, void __iomem *addr_b,
u32 *dest_a, u32 *dest_b)
{
*dest_a = readl(addr_a);
*dest_b = readl(addr_b);
return 0; /* read_poll_timeout() op argument must return something. */
}
static int eqr_busy_wait_locked(struct eqr_private *priv, struct device *dev,
u32 domain, u32 offset, bool assert)
{
void __iomem *base = priv->base + priv->data->domains[domain].offset;
enum eqr_domain_type domain_type = priv->data->domains[domain].type;
unsigned long timeout_us = eqr_timings[domain_type].timeout_us;
unsigned long sleep_us = eqr_timings[domain_type].sleep_us;
u32 val, mask, rst_status, clk_status;
void __iomem *reg;
int ret;
lockdep_assert_held(&priv->mutexes[domain]);
switch (domain_type) {
case EQR_EYEQ5_SARCR:
reg = base + EQR_EYEQ5_SARCR_STATUS;
mask = BIT(offset);
ret = readl_poll_timeout(reg, val, !(val & mask) == assert,
sleep_us, timeout_us);
break;
case EQR_EYEQ5_ACRP:
reg = base + 4 * offset;
if (assert)
mask = EQR_EYEQ5_ACRP_ST_POWER_DOWN;
else
mask = EQR_EYEQ5_ACRP_ST_ACTIVE;
ret = readl_poll_timeout(reg, val, !!(val & mask),
sleep_us, timeout_us);
break;
case EQR_EYEQ5_PCIE:
ret = 0; /* No busy waiting. */
break;
case EQR_EYEQ6H_SARCR:
/*
* Wait until both bits change:
* readl(base + EQR_EYEQ6H_SARCR_RST_STATUS) & BIT(offset)
* readl(base + EQR_EYEQ6H_SARCR_CLK_STATUS) & BIT(offset)
*/
mask = BIT(offset);
ret = read_poll_timeout(eqr_double_readl, val,
(!(rst_status & mask) == assert) &&
(!(clk_status & mask) == assert),
sleep_us, timeout_us, false,
base + EQR_EYEQ6H_SARCR_RST_STATUS,
base + EQR_EYEQ6H_SARCR_CLK_STATUS,
&rst_status, &clk_status);
break;
default:
WARN_ON(1);
ret = -EINVAL;
break;
}
if (ret == -ETIMEDOUT)
dev_dbg(dev, "%u-%u: timeout\n", domain, offset);
return ret;
}
static void eqr_assert_locked(struct eqr_private *priv, u32 domain, u32 offset)
{
enum eqr_domain_type domain_type = priv->data->domains[domain].type;
void __iomem *base, *reg;
u32 val;
lockdep_assert_held(&priv->mutexes[domain]);
base = priv->base + priv->data->domains[domain].offset;
switch (domain_type) {
case EQR_EYEQ5_SARCR:
reg = base + EQR_EYEQ5_SARCR_REQUEST;
writel(readl(reg) & ~BIT(offset), reg);
break;
case EQR_EYEQ5_ACRP:
reg = base + 4 * offset;
writel(readl(reg) | EQR_EYEQ5_ACRP_PD_REQ, reg);
break;
case EQR_EYEQ5_PCIE:
writel(readl(base) & ~BIT(offset), base);
break;
case EQR_EYEQ6H_SARCR:
/* RST_REQUEST and CLK_REQUEST must be kept in sync. */
val = readl(base + EQR_EYEQ6H_SARCR_RST_REQUEST);
val &= ~BIT(offset);
writel(val, base + EQR_EYEQ6H_SARCR_RST_REQUEST);
writel(val, base + EQR_EYEQ6H_SARCR_CLK_REQUEST);
break;
default:
WARN_ON(1);
break;
}
}
static int eqr_assert(struct reset_controller_dev *rcdev, unsigned long id)
{
struct eqr_private *priv = eqr_rcdev_to_priv(rcdev);
u32 domain = FIELD_GET(ID_DOMAIN_MASK, id);
u32 offset = FIELD_GET(ID_OFFSET_MASK, id);
dev_dbg(rcdev->dev, "%u-%u: assert request\n", domain, offset);
guard(mutex)(&priv->mutexes[domain]);
eqr_assert_locked(priv, domain, offset);
return eqr_busy_wait_locked(priv, rcdev->dev, domain, offset, true);
}
static void eqr_deassert_locked(struct eqr_private *priv, u32 domain,
u32 offset)
{
enum eqr_domain_type domain_type = priv->data->domains[domain].type;
void __iomem *base, *reg;
u32 val;
lockdep_assert_held(&priv->mutexes[domain]);
base = priv->base + priv->data->domains[domain].offset;
switch (domain_type) {
case EQR_EYEQ5_SARCR:
reg = base + EQR_EYEQ5_SARCR_REQUEST;
writel(readl(reg) | BIT(offset), reg);
break;
case EQR_EYEQ5_ACRP:
reg = base + 4 * offset;
writel(readl(reg) & ~EQR_EYEQ5_ACRP_PD_REQ, reg);
break;
case EQR_EYEQ5_PCIE:
writel(readl(base) | BIT(offset), base);
break;
case EQR_EYEQ6H_SARCR:
/* RST_REQUEST and CLK_REQUEST must be kept in sync. */
val = readl(base + EQR_EYEQ6H_SARCR_RST_REQUEST);
val |= BIT(offset);
writel(val, base + EQR_EYEQ6H_SARCR_RST_REQUEST);
writel(val, base + EQR_EYEQ6H_SARCR_CLK_REQUEST);
break;
default:
WARN_ON(1);
break;
}
}
static int eqr_deassert(struct reset_controller_dev *rcdev, unsigned long id)
{
struct eqr_private *priv = eqr_rcdev_to_priv(rcdev);
u32 domain = FIELD_GET(ID_DOMAIN_MASK, id);
u32 offset = FIELD_GET(ID_OFFSET_MASK, id);
dev_dbg(rcdev->dev, "%u-%u: deassert request\n", domain, offset);
guard(mutex)(&priv->mutexes[domain]);
eqr_deassert_locked(priv, domain, offset);
return eqr_busy_wait_locked(priv, rcdev->dev, domain, offset, false);
}
static int eqr_status(struct reset_controller_dev *rcdev, unsigned long id)
{
u32 domain = FIELD_GET(ID_DOMAIN_MASK, id);
u32 offset = FIELD_GET(ID_OFFSET_MASK, id);
struct eqr_private *priv = eqr_rcdev_to_priv(rcdev);
enum eqr_domain_type domain_type = priv->data->domains[domain].type;
void __iomem *base, *reg;
dev_dbg(rcdev->dev, "%u-%u: status request\n", domain, offset);
guard(mutex)(&priv->mutexes[domain]);
base = priv->base + priv->data->domains[domain].offset;
switch (domain_type) {
case EQR_EYEQ5_SARCR:
reg = base + EQR_EYEQ5_SARCR_STATUS;
return !(readl(reg) & BIT(offset));
case EQR_EYEQ5_ACRP:
reg = base + 4 * offset;
return !(readl(reg) & EQR_EYEQ5_ACRP_ST_ACTIVE);
case EQR_EYEQ5_PCIE:
return !(readl(base) & BIT(offset));
case EQR_EYEQ6H_SARCR:
reg = base + EQR_EYEQ6H_SARCR_RST_STATUS;
return !(readl(reg) & BIT(offset));
default:
return -EINVAL;
}
}
static const struct reset_control_ops eqr_ops = {
.assert = eqr_assert,
.deassert = eqr_deassert,
.status = eqr_status,
};
static int eqr_of_xlate_internal(struct reset_controller_dev *rcdev,
u32 domain, u32 offset)
{
struct eqr_private *priv = eqr_rcdev_to_priv(rcdev);
if (domain >= priv->data->domain_count || offset > 31 ||
!(priv->data->domains[domain].valid_mask & BIT(offset))) {
dev_err(rcdev->dev, "%u-%u: invalid reset\n", domain, offset);
return -EINVAL;
}
return FIELD_PREP(ID_DOMAIN_MASK, domain) | FIELD_PREP(ID_OFFSET_MASK, offset);
}
static int eqr_of_xlate_onecell(struct reset_controller_dev *rcdev,
const struct of_phandle_args *reset_spec)
{
return eqr_of_xlate_internal(rcdev, 0, reset_spec->args[0]);
}
static int eqr_of_xlate_twocells(struct reset_controller_dev *rcdev,
const struct of_phandle_args *reset_spec)
{
return eqr_of_xlate_internal(rcdev, reset_spec->args[0], reset_spec->args[1]);
}
static int eqr_probe(struct auxiliary_device *adev,
const struct auxiliary_device_id *id)
{
const struct of_device_id *match;
struct device *dev = &adev->dev;
struct eqr_private *priv;
unsigned int i;
int ret;
/*
* We are an auxiliary device of clk-eyeq. We do not have an OF node by
* default; let's reuse our parent's OF node.
*/
WARN_ON(dev->of_node);
device_set_of_node_from_dev(dev, dev->parent);
if (!dev->of_node)
return -ENODEV;
/*
* Using our newfound OF node, we can get match data. We cannot use
* device_get_match_data() because it does not match reused OF nodes.
*/
match = of_match_node(dev->driver->of_match_table, dev->of_node);
if (!match || !match->data)
return -ENODEV;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->data = match->data;
priv->base = (void __iomem *)dev_get_platdata(dev);
priv->rcdev.ops = &eqr_ops;
priv->rcdev.owner = THIS_MODULE;
priv->rcdev.dev = dev;
priv->rcdev.of_node = dev->of_node;
if (priv->data->domain_count == 1) {
priv->rcdev.of_reset_n_cells = 1;
priv->rcdev.of_xlate = eqr_of_xlate_onecell;
} else {
priv->rcdev.of_reset_n_cells = 2;
priv->rcdev.of_xlate = eqr_of_xlate_twocells;
}
for (i = 0; i < priv->data->domain_count; i++)
mutex_init(&priv->mutexes[i]);
priv->rcdev.nr_resets = 0;
for (i = 0; i < priv->data->domain_count; i++)
priv->rcdev.nr_resets += hweight32(priv->data->domains[i].valid_mask);
ret = devm_reset_controller_register(dev, &priv->rcdev);
if (ret)
return dev_err_probe(dev, ret, "failed registering reset controller\n");
return 0;
}
static const struct eqr_domain_descriptor eqr_eyeq5_domains[] = {
{
.type = EQR_EYEQ5_SARCR,
.valid_mask = 0xFFFFFF8,
.offset = 0x004,
},
{
.type = EQR_EYEQ5_ACRP,
.valid_mask = 0x0001FFF,
.offset = 0x200,
},
{
.type = EQR_EYEQ5_PCIE,
.valid_mask = 0x007BFFF,
.offset = 0x120,
},
};
static const struct eqr_match_data eqr_eyeq5_data = {
.domain_count = ARRAY_SIZE(eqr_eyeq5_domains),
.domains = eqr_eyeq5_domains,
};
static const struct eqr_domain_descriptor eqr_eyeq6l_domains[] = {
{
.type = EQR_EYEQ5_SARCR,
.valid_mask = 0x3FFF,
.offset = 0x004,
},
{
.type = EQR_EYEQ5_ACRP,
.valid_mask = 0x00FF,
.offset = 0x200,
},
};
static const struct eqr_match_data eqr_eyeq6l_data = {
.domain_count = ARRAY_SIZE(eqr_eyeq6l_domains),
.domains = eqr_eyeq6l_domains,
};
/* West and east OLBs each have an instance. */
static const struct eqr_domain_descriptor eqr_eyeq6h_we_domains[] = {
{
.type = EQR_EYEQ6H_SARCR,
.valid_mask = 0x1F7F,
.offset = 0x004,
},
};
static const struct eqr_match_data eqr_eyeq6h_we_data = {
.domain_count = ARRAY_SIZE(eqr_eyeq6h_we_domains),
.domains = eqr_eyeq6h_we_domains,
};
static const struct eqr_domain_descriptor eqr_eyeq6h_acc_domains[] = {
{
.type = EQR_EYEQ5_ACRP,
.valid_mask = 0x7FFF,
.offset = 0x000,
},
};
static const struct eqr_match_data eqr_eyeq6h_acc_data = {
.domain_count = ARRAY_SIZE(eqr_eyeq6h_acc_domains),
.domains = eqr_eyeq6h_acc_domains,
};
/*
* Table describes OLB system-controller compatibles.
* It does not get used to match against devicetree node.
*/
static const struct of_device_id eqr_match_table[] = {
{ .compatible = "mobileye,eyeq5-olb", .data = &eqr_eyeq5_data },
{ .compatible = "mobileye,eyeq6l-olb", .data = &eqr_eyeq6l_data },
{ .compatible = "mobileye,eyeq6h-west-olb", .data = &eqr_eyeq6h_we_data },
{ .compatible = "mobileye,eyeq6h-east-olb", .data = &eqr_eyeq6h_we_data },
{ .compatible = "mobileye,eyeq6h-acc-olb", .data = &eqr_eyeq6h_acc_data },
{}
};
MODULE_DEVICE_TABLE(of, eqr_match_table);
static const struct auxiliary_device_id eqr_id_table[] = {
{ .name = "clk_eyeq.reset" },
{ .name = "clk_eyeq.reset_west" },
{ .name = "clk_eyeq.reset_east" },
{ .name = "clk_eyeq.reset_acc" },
{}
};
MODULE_DEVICE_TABLE(auxiliary, eqr_id_table);
static struct auxiliary_driver eqr_driver = {
.probe = eqr_probe,
.id_table = eqr_id_table,
.driver = {
.of_match_table = eqr_match_table,
}
};
module_auxiliary_driver(eqr_driver);