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VExpress modularization 

This series enables building various Versatile Express platform drivers
 as modules. The primary target is the Fast Model FVP which is supported
 in Android. As Android is moving towards their GKI, or generic kernel,
 the hardware support has to be in modules. Currently ARCH_VEXPRESS
 enables several built-in only drivers. Some of these are needed, but
 some are only needed for older 32-bit VExpress platforms and can just
 be disabled.
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Merge tag 'vexpress-modules-for-soc-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux into arm/soc

VExpress modularization

This series enables building various Versatile Express platform drivers
as modules. The primary target is the Fast Model FVP which is supported
in Android. As Android is moving towards their GKI, or generic kernel,
the hardware support has to be in modules. Currently ARCH_VEXPRESS
enables several built-in only drivers. Some of these are needed, but
some are only needed for older 32-bit VExpress platforms and can just
be disabled.

* tag 'vexpress-modules-for-soc-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  ARM: vexpress: Don't select VEXPRESS_CONFIG
  bus: vexpress-config: Support building as module
  vexpress: Move setting master site to vexpress-config bus
  bus: vexpress-config: simplify config bus probing
  bus: vexpress-config: Merge vexpress-syscfg into vexpress-config
  mfd: vexpress-sysreg: Support building as a module
  mfd: vexpress-sysreg: Use devres API variants
  mfd: vexpress-sysreg: Drop unused syscon child devices
  mfd: vexpress-sysreg: Drop selecting CONFIG_CLKSRC_MMIO
  clk: vexpress-osc: Support building as a module
  clk: vexpress-osc: Use the devres clock API variants
  clk: versatile: Only enable SP810 on 32-bit by default
  clk: versatile: Rework kconfig structure
  amba: Retry adding deferred devices at late_initcall
  arm64: vexpress: Don't select CONFIG_POWER_RESET_VEXPRESS
  ARM: vexpress: Move vexpress_flags_set() into arch code

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2020-05-15 23:04:40 +02:00
parent 5df04698bd 848685c25d
commit a875e0e5a2
20 changed files with 371 additions and 538 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/mach-integrator/Kconfig
View File

@ -3,7 +3,6 @@ menuconfig ARCH_INTEGRATOR
bool "ARM Ltd. Integrator family"
depends on ARCH_MULTI_V4T || ARCH_MULTI_V5 || ARCH_MULTI_V6
select ARM_AMBA
select COMMON_CLK_VERSATILE
select CMA
select DMA_CMA
select HAVE_TCM

1
arch/arm/mach-realview/Kconfig
View File

@ -6,7 +6,6 @@ menuconfig ARCH_REALVIEW
select ARM_GIC
select ARM_TIMER_SP804
select CLK_SP810
select COMMON_CLK_VERSATILE
select GPIO_PL061 if GPIOLIB
select HAVE_ARM_SCU if SMP
select HAVE_ARM_TWD if SMP

1
arch/arm/mach-versatile/Kconfig
View File

@ -6,7 +6,6 @@ config ARCH_VERSATILE
select ARM_TIMER_SP804
select ARM_VIC
select CLKSRC_VERSATILE
select COMMON_CLK_VERSATILE
select CPU_ARM926T
select ICST
select MFD_SYSCON

4
arch/arm/mach-vexpress/Kconfig
View File

@ -7,7 +7,6 @@ menuconfig ARCH_VEXPRESS
select ARM_GIC
select ARM_GLOBAL_TIMER
select ARM_TIMER_SP804
select COMMON_CLK_VERSATILE
select GPIOLIB
select HAVE_ARM_SCU if SMP
select HAVE_ARM_TWD if SMP
@ -20,9 +19,6 @@ menuconfig ARCH_VEXPRESS
select POWER_SUPPLY
select REGULATOR if MMC_ARMMMCI
select REGULATOR_FIXED_VOLTAGE if REGULATOR
select VEXPRESS_CONFIG
select VEXPRESS_SYSCFG
select MFD_VEXPRESS_SYSREG
help
This option enables support for systems using Cortex processor based
ARM core and logic (FPGA) tiles on the Versatile Express motherboard,

1
arch/arm/mach-vexpress/core.h
View File

@ -1,3 +1,4 @@
bool vexpress_smp_init_ops(void);
void vexpress_flags_set(u32 data);
extern const struct smp_operations vexpress_smp_dt_ops;

1
arch/arm/mach-vexpress/dcscb.c
View File

@ -20,6 +20,7 @@
#include <asm/cputype.h>
#include <asm/cp15.h>
#include "core.h"
#define RST_HOLD0 0x0
#define RST_HOLD1 0x4

23
arch/arm/mach-vexpress/v2m.c
View File

@ -1,8 +1,31 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/mach/arch.h>
#include "core.h"
#define SYS_FLAGSSET 0x030
#define SYS_FLAGSCLR 0x034
void vexpress_flags_set(u32 data)
{
static void __iomem *base;
if (!base) {
struct device_node *node = of_find_compatible_node(NULL, NULL,
"arm,vexpress-sysreg");
base = of_iomap(node, 0);
}
if (WARN_ON(!base))
return;
writel(~0, base + SYS_FLAGSCLR);
writel(data, base + SYS_FLAGSSET);
}
static const char * const v2m_dt_match[] __initconst = {
"arm,vexpress",
NULL,

3
arch/arm64/Kconfig.platforms
View File

@ -274,12 +274,9 @@ config ARCH_UNIPHIER
config ARCH_VEXPRESS
bool "ARMv8 software model (Versatile Express)"
select COMMON_CLK_VERSATILE
select GPIOLIB
select PM
select PM_GENERIC_DOMAINS
select POWER_RESET_VEXPRESS
select VEXPRESS_CONFIG
help
This enables support for the ARMv8 software model (Versatile
Express).

14
drivers/amba/bus.c
View File

@ -505,7 +505,7 @@ static DECLARE_DELAYED_WORK(deferred_retry_work, amba_deferred_retry_func);
#define DEFERRED_DEVICE_TIMEOUT (msecs_to_jiffies(5 * 1000))
static void amba_deferred_retry_func(struct work_struct *dummy)
static int amba_deferred_retry(void)
{
struct deferred_device *ddev, *tmp;
@ -521,11 +521,19 @@ static void amba_deferred_retry_func(struct work_struct *dummy)
kfree(ddev);
}
mutex_unlock(&deferred_devices_lock);
return 0;
}
late_initcall(amba_deferred_retry);
static void amba_deferred_retry_func(struct work_struct *dummy)
{
amba_deferred_retry();
if (!list_empty(&deferred_devices))
schedule_delayed_work(&deferred_retry_work,
DEFERRED_DEVICE_TIMEOUT);
mutex_unlock(&deferred_devices_lock);
}
/**

2
drivers/bus/Kconfig
View File

@ -192,7 +192,7 @@ config UNIPHIER_SYSTEM_BUS
needed to use on-board devices connected to UniPhier SoCs.
config VEXPRESS_CONFIG
bool "Versatile Express configuration bus"
tristate "Versatile Express configuration bus"
default y if ARCH_VEXPRESS
depends on ARM || ARM64
depends on OF

386
drivers/bus/vexpress-config.c
View File

@ -6,10 +6,61 @@
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/vexpress.h>
#define SYS_MISC 0x0
#define SYS_MISC_MASTERSITE (1 << 14)
#define SYS_PROCID0 0x24
#define SYS_PROCID1 0x28
#define SYS_HBI_MASK 0xfff
#define SYS_PROCIDx_HBI_SHIFT 0
#define SYS_CFGDATA 0x40
#define SYS_CFGCTRL 0x44
#define SYS_CFGCTRL_START (1 << 31)
#define SYS_CFGCTRL_WRITE (1 << 30)
#define SYS_CFGCTRL_DCC(n) (((n) & 0xf) << 26)
#define SYS_CFGCTRL_FUNC(n) (((n) & 0x3f) << 20)
#define SYS_CFGCTRL_SITE(n) (((n) & 0x3) << 16)
#define SYS_CFGCTRL_POSITION(n) (((n) & 0xf) << 12)
#define SYS_CFGCTRL_DEVICE(n) (((n) & 0xfff) << 0)
#define SYS_CFGSTAT 0x48
#define SYS_CFGSTAT_ERR (1 << 1)
#define SYS_CFGSTAT_COMPLETE (1 << 0)
#define VEXPRESS_SITE_MB 0
#define VEXPRESS_SITE_DB1 1
#define VEXPRESS_SITE_DB2 2
#define VEXPRESS_SITE_MASTER 0xf
struct vexpress_syscfg {
struct device *dev;
void __iomem *base;
struct list_head funcs;
};
struct vexpress_syscfg_func {
struct list_head list;
struct vexpress_syscfg *syscfg;
struct regmap *regmap;
int num_templates;
u32 template[]; /* Keep it last! */
};
struct vexpress_config_bridge_ops {
struct regmap * (*regmap_init)(struct device *dev, void *context);
void (*regmap_exit)(struct regmap *regmap, void *context);
};
struct vexpress_config_bridge {
struct vexpress_config_bridge_ops *ops;
@ -18,26 +69,20 @@ struct vexpress_config_bridge {
static DEFINE_MUTEX(vexpress_config_mutex);
static struct class *vexpress_config_class;
static u32 vexpress_config_site_master = VEXPRESS_SITE_MASTER;
void vexpress_config_set_master(u32 site)
static void vexpress_config_set_master(u32 site)
{
vexpress_config_site_master = site;
}
u32 vexpress_config_get_master(void)
{
return vexpress_config_site_master;
}
void vexpress_config_lock(void *arg)
static void vexpress_config_lock(void *arg)
{
mutex_lock(&vexpress_config_mutex);
}
void vexpress_config_unlock(void *arg)
static void vexpress_config_unlock(void *arg)
{
mutex_unlock(&vexpress_config_mutex);
}
@ -59,7 +104,7 @@ static void vexpress_config_find_prop(struct device_node *node,
}
}
int vexpress_config_get_topo(struct device_node *node, u32 *site,
static int vexpress_config_get_topo(struct device_node *node, u32 *site,
u32 *position, u32 *dcc)
{
vexpress_config_find_prop(node, "arm,vexpress,site", site);
@ -88,9 +133,6 @@ struct regmap *devm_regmap_init_vexpress_config(struct device *dev)
struct regmap *regmap;
struct regmap **res;
if (WARN_ON(dev->parent->class != vexpress_config_class))
return ERR_PTR(-ENODEV);
bridge = dev_get_drvdata(dev->parent);
if (WARN_ON(!bridge))
return ERR_PTR(-EINVAL);
@ -113,91 +155,265 @@ struct regmap *devm_regmap_init_vexpress_config(struct device *dev)
}
EXPORT_SYMBOL_GPL(devm_regmap_init_vexpress_config);
struct device *vexpress_config_bridge_register(struct device *parent,
struct vexpress_config_bridge_ops *ops, void *context)
static int vexpress_syscfg_exec(struct vexpress_syscfg_func *func,
int index, bool write, u32 *data)
{
struct device *dev;
struct vexpress_config_bridge *bridge;
struct vexpress_syscfg *syscfg = func->syscfg;
u32 command, status;
int tries;
long timeout;
if (!vexpress_config_class) {
vexpress_config_class = class_create(THIS_MODULE,
"vexpress-config");
if (IS_ERR(vexpress_config_class))
return (void *)vexpress_config_class;
}
dev = device_create(vexpress_config_class, parent, 0,
NULL, "%s.bridge", dev_name(parent));
if (IS_ERR(dev))
return dev;
bridge = devm_kmalloc(dev, sizeof(*bridge), GFP_KERNEL);
if (!bridge) {
put_device(dev);
device_unregister(dev);
return ERR_PTR(-ENOMEM);
}
bridge->ops = ops;
bridge->context = context;
dev_set_drvdata(dev, bridge);
dev_dbg(parent, "Registered bridge '%s', parent node %p\n",
dev_name(dev), parent->of_node);
return dev;
}
static int vexpress_config_node_match(struct device *dev, const void *data)
{
const struct device_node *node = data;
dev_dbg(dev, "Parent node %p, looking for %p\n",
dev->parent->of_node, node);
return dev->parent->of_node == node;
}
static int vexpress_config_populate(struct device_node *node)
{
struct device_node *bridge;
struct device *parent;
int ret;
bridge = of_parse_phandle(node, "arm,vexpress,config-bridge", 0);
if (!bridge)
if (WARN_ON(index >= func->num_templates))
return -EINVAL;
parent = class_find_device(vexpress_config_class, NULL, bridge,
vexpress_config_node_match);
of_node_put(bridge);
if (WARN_ON(!parent))
return -ENODEV;
command = readl(syscfg->base + SYS_CFGCTRL);
if (WARN_ON(command & SYS_CFGCTRL_START))
return -EBUSY;
ret = of_platform_populate(node, NULL, NULL, parent);
command = func->template[index];
command |= SYS_CFGCTRL_START;
command |= write ? SYS_CFGCTRL_WRITE : 0;
put_device(parent);
/* Use a canary for reads */
if (!write)
*data = 0xdeadbeef;
return ret;
dev_dbg(syscfg->dev, "func %p, command %x, data %x\n",
func, command, *data);
writel(*data, syscfg->base + SYS_CFGDATA);
writel(0, syscfg->base + SYS_CFGSTAT);
writel(command, syscfg->base + SYS_CFGCTRL);
mb();
/* The operation can take ages... Go to sleep, 100us initially */
tries = 100;
timeout = 100;
do {
if (!irqs_disabled()) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(usecs_to_jiffies(timeout));
if (signal_pending(current))
return -EINTR;
} else {
udelay(timeout);
}
status = readl(syscfg->base + SYS_CFGSTAT);
if (status & SYS_CFGSTAT_ERR)
return -EFAULT;
if (timeout > 20)
timeout -= 20;
} while (--tries && !(status & SYS_CFGSTAT_COMPLETE));
if (WARN_ON_ONCE(!tries))
return -ETIMEDOUT;
if (!write) {
*data = readl(syscfg->base + SYS_CFGDATA);
dev_dbg(syscfg->dev, "func %p, read data %x\n", func, *data);
}
return 0;
}
static int __init vexpress_config_init(void)
static int vexpress_syscfg_read(void *context, unsigned int index,
unsigned int *val)
{
int err = 0;
struct device_node *node;
struct vexpress_syscfg_func *func = context;
/* Need the config devices early, before the "normal" devices... */
for_each_compatible_node(node, NULL, "arm,vexpress,config-bus") {
err = vexpress_config_populate(node);
if (err) {
of_node_put(node);
return vexpress_syscfg_exec(func, index, false, val);
}
static int vexpress_syscfg_write(void *context, unsigned int index,
unsigned int val)
{
struct vexpress_syscfg_func *func = context;
return vexpress_syscfg_exec(func, index, true, &val);
}
static struct regmap_config vexpress_syscfg_regmap_config = {
.lock = vexpress_config_lock,
.unlock = vexpress_config_unlock,
.reg_bits = 32,
.val_bits = 32,
.reg_read = vexpress_syscfg_read,
.reg_write = vexpress_syscfg_write,
.reg_format_endian = REGMAP_ENDIAN_LITTLE,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
static struct regmap *vexpress_syscfg_regmap_init(struct device *dev,
void *context)
{
int err;
struct vexpress_syscfg *syscfg = context;
struct vexpress_syscfg_func *func;
struct property *prop;
const __be32 *val = NULL;
__be32 energy_quirk[4];
int num;
u32 site, position, dcc;
int i;
err = vexpress_config_get_topo(dev->of_node, &site,
&position, &dcc);
if (err)
return ERR_PTR(err);
prop = of_find_property(dev->of_node,
"arm,vexpress-sysreg,func", NULL);
if (!prop)
return ERR_PTR(-EINVAL);
num = prop->length / sizeof(u32) / 2;
val = prop->value;
/*
* "arm,vexpress-energy" function used to be described
* by its first device only, now it requires both
*/
if (num == 1 && of_device_is_compatible(dev->of_node,
"arm,vexpress-energy")) {
num = 2;
energy_quirk[0] = *val;
energy_quirk[2] = *val++;
energy_quirk[1] = *val;
energy_quirk[3] = cpu_to_be32(be32_to_cpup(val) + 1);
val = energy_quirk;
}
func = kzalloc(struct_size(func, template, num), GFP_KERNEL);
if (!func)
return ERR_PTR(-ENOMEM);
func->syscfg = syscfg;
func->num_templates = num;
for (i = 0; i < num; i++) {
u32 function, device;
function = be32_to_cpup(val++);
device = be32_to_cpup(val++);
dev_dbg(dev, "func %p: %u/%u/%u/%u/%u\n",
func, site, position, dcc,
function, device);
func->template[i] = SYS_CFGCTRL_DCC(dcc);
func->template[i] |= SYS_CFGCTRL_SITE(site);
func->template[i] |= SYS_CFGCTRL_POSITION(position);
func->template[i] |= SYS_CFGCTRL_FUNC(function);
func->template[i] |= SYS_CFGCTRL_DEVICE(device);
}
vexpress_syscfg_regmap_config.max_register = num - 1;
func->regmap = regmap_init(dev, NULL, func,
&vexpress_syscfg_regmap_config);
if (IS_ERR(func->regmap)) {
void *err = func->regmap;
kfree(func);
return err;
}
list_add(&func->list, &syscfg->funcs);
return func->regmap;
}
static void vexpress_syscfg_regmap_exit(struct regmap *regmap, void *context)
{
struct vexpress_syscfg *syscfg = context;
struct vexpress_syscfg_func *func, *tmp;
regmap_exit(regmap);
list_for_each_entry_safe(func, tmp, &syscfg->funcs, list) {
if (func->regmap == regmap) {
list_del(&syscfg->funcs);
kfree(func);
break;
}
}
return err;
}
postcore_initcall(vexpress_config_init);
static struct vexpress_config_bridge_ops vexpress_syscfg_bridge_ops = {
.regmap_init = vexpress_syscfg_regmap_init,
.regmap_exit = vexpress_syscfg_regmap_exit,
};
static int vexpress_syscfg_probe(struct platform_device *pdev)
{
struct vexpress_syscfg *syscfg;
struct resource *res;
struct vexpress_config_bridge *bridge;
struct device_node *node;
int master;
u32 dt_hbi;
syscfg = devm_kzalloc(&pdev->dev, sizeof(*syscfg), GFP_KERNEL);
if (!syscfg)
return -ENOMEM;
syscfg->dev = &pdev->dev;
INIT_LIST_HEAD(&syscfg->funcs);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
syscfg->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(syscfg->base))
return PTR_ERR(syscfg->base);
bridge = devm_kmalloc(&pdev->dev, sizeof(*bridge), GFP_KERNEL);
if (!bridge)
return -ENOMEM;
bridge->ops = &vexpress_syscfg_bridge_ops;
bridge->context = syscfg;
dev_set_drvdata(&pdev->dev, bridge);
master = readl(syscfg->base + SYS_MISC) & SYS_MISC_MASTERSITE ?
VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1;
vexpress_config_set_master(master);
/* Confirm board type against DT property, if available */
if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) {
u32 id = readl(syscfg->base + (master == VEXPRESS_SITE_DB1 ?
SYS_PROCID0 : SYS_PROCID1));
u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;
if (WARN_ON(dt_hbi != hbi))
dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n",
dt_hbi, hbi);
}
for_each_compatible_node(node, NULL, "arm,vexpress,config-bus") {
struct device_node *bridge_np;
bridge_np = of_parse_phandle(node, "arm,vexpress,config-bridge", 0);
if (bridge_np != pdev->dev.parent->of_node)
continue;
of_platform_populate(node, NULL, NULL, &pdev->dev);
}
return 0;
}
static const struct platform_device_id vexpress_syscfg_id_table[] = {
{ "vexpress-syscfg", },
{},
};
MODULE_DEVICE_TABLE(platform, vexpress_syscfg_id_table);
static struct platform_driver vexpress_syscfg_driver = {
.driver.name = "vexpress-syscfg",
.id_table = vexpress_syscfg_id_table,
.probe = vexpress_syscfg_probe,
};
module_platform_driver(vexpress_syscfg_driver);
MODULE_LICENSE("GPL v2");

2
drivers/clk/Makefile
View File

@ -114,7 +114,7 @@ obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-y += ti/
obj-$(CONFIG_CLK_UNIPHIER) += uniphier/
obj-$(CONFIG_ARCH_U8500) += ux500/
obj-$(CONFIG_COMMON_CLK_VERSATILE) += versatile/
obj-y += versatile/
ifeq ($(CONFIG_COMMON_CLK), y)
obj-$(CONFIG_X86) += x86/
endif

26
drivers/clk/versatile/Kconfig
View File

@ -1,33 +1,35 @@
# SPDX-License-Identifier: GPL-2.0-only
config ICST
bool
config COMMON_CLK_VERSATILE
bool "Clock driver for ARM Reference designs"
depends on ARCH_INTEGRATOR || ARCH_REALVIEW || \
ARCH_VERSATILE || ARCH_VEXPRESS || ARM64 || \
COMPILE_TEST
menuconfig COMMON_CLK_VERSATILE
bool "Clock driver for ARM Reference designs" if COMPILE_TEST
default y if ARCH_INTEGRATOR || ARCH_REALVIEW || \
ARCH_VERSATILE || ARCH_VEXPRESS
if COMMON_CLK_VERSATILE
config ICST
bool "Clock driver for ARM Reference designs ICST"
select REGMAP_MMIO
---help---
Supports clocking on ARM Reference designs:
- Integrator/AP and Integrator/CP
- RealView PB1176, EB, PB11MP and PBX
- Versatile Express
config CLK_SP810
bool "Clock driver for ARM SP810 System Controller"
depends on COMMON_CLK_VERSATILE
default y if ARCH_VEXPRESS
default y if (ARCH_VEXPRESS && ARM)
---help---
Supports clock muxing (REFCLK/TIMCLK to TIMERCLKEN0-3) capabilities
of the ARM SP810 System Controller cell.
config CLK_VEXPRESS_OSC
bool "Clock driver for Versatile Express OSC clock generators"
depends on COMMON_CLK_VERSATILE
tristate "Clock driver for Versatile Express OSC clock generators"
depends on VEXPRESS_CONFIG
select REGMAP_MMIO
default y if ARCH_VEXPRESS
---help---
Simple regmap-based driver driving clock generators on Versatile
Express platforms hidden behind its configuration infrastructure,
commonly known as OSCs.
endif

20
drivers/clk/versatile/clk-vexpress-osc.c
View File

@ -7,6 +7,7 @@
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@ -65,8 +66,8 @@ static int vexpress_osc_probe(struct platform_device *pdev)
{
struct clk_init_data init;
struct vexpress_osc *osc;
struct clk *clk;
u32 range[2];
int ret;
osc = devm_kzalloc(&pdev->dev, sizeof(*osc), GFP_KERNEL);
if (!osc)
@ -92,11 +93,11 @@ static int vexpress_osc_probe(struct platform_device *pdev)
osc->hw.init = &init;
clk = clk_register(NULL, &osc->hw);
if (IS_ERR(clk))
return PTR_ERR(clk);
ret = devm_clk_hw_register(&pdev->dev, &osc->hw);
if (ret < 0)
return ret;
of_clk_add_provider(pdev->dev.of_node, of_clk_src_simple_get, clk);
devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_simple_get, &osc->hw);
clk_hw_set_rate_range(&osc->hw, osc->rate_min, osc->rate_max);
dev_dbg(&pdev->dev, "Registered clock '%s'\n", init.name);
@ -108,6 +109,7 @@ static const struct of_device_id vexpress_osc_of_match[] = {
{ .compatible = "arm,vexpress-osc", },
{}
};
MODULE_DEVICE_TABLE(of, vexpress_osc_of_match);
static struct platform_driver vexpress_osc_driver = {
.driver = {
@ -116,9 +118,5 @@ static struct platform_driver vexpress_osc_driver = {
},
.probe = vexpress_osc_probe,
};
static int __init vexpress_osc_init(void)
{
return platform_driver_register(&vexpress_osc_driver);
}
core_initcall(vexpress_osc_init);
module_platform_driver(vexpress_osc_driver);
MODULE_LICENSE("GPL v2");

5
drivers/mfd/Kconfig
View File

@ -2028,10 +2028,9 @@ config MCP_UCB1200_TS
endmenu
config MFD_VEXPRESS_SYSREG
bool "Versatile Express System Registers"
depends on VEXPRESS_CONFIG && GPIOLIB && !ARCH_USES_GETTIMEOFFSET
tristate "Versatile Express System Registers"
depends on VEXPRESS_CONFIG && GPIOLIB
default y
select CLKSRC_MMIO
select GPIO_GENERIC_PLATFORM
select MFD_CORE
select MFD_SYSCON

99
drivers/mfd/vexpress-sysreg.c
View File

@ -8,13 +8,12 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/mfd/core.h>
#include <linux/of_address.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_data/syscon.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/vexpress.h>
#define SYS_ID 0x000
#define SYS_SW 0x004
@ -37,35 +36,8 @@
#define SYS_CFGCTRL 0x0a4
#define SYS_CFGSTAT 0x0a8
#define SYS_HBI_MASK 0xfff
#define SYS_PROCIDx_HBI_SHIFT 0
#define SYS_MISC_MASTERSITE (1 << 14)
void vexpress_flags_set(u32 data)
{
static void __iomem *base;
if (!base) {
struct device_node *node = of_find_compatible_node(NULL, NULL,
"arm,vexpress-sysreg");
base = of_iomap(node, 0);
}
if (WARN_ON(!base))
return;
writel(~0, base + SYS_FLAGSCLR);
writel(data, base + SYS_FLAGSSET);
}
/* The sysreg block is just a random collection of various functions... */
static struct syscon_platform_data vexpress_sysreg_sys_id_pdata = {
.label = "sys_id",
};
static struct bgpio_pdata vexpress_sysreg_sys_led_pdata = {
.label = "sys_led",
.base = -1,
@ -84,24 +56,8 @@ static struct bgpio_pdata vexpress_sysreg_sys_flash_pdata = {
.ngpio = 1,
};
static struct syscon_platform_data vexpress_sysreg_sys_misc_pdata = {
.label = "sys_misc",
};
static struct syscon_platform_data vexpress_sysreg_sys_procid_pdata = {
.label = "sys_procid",
};
static struct mfd_cell vexpress_sysreg_cells[] = {
{
.name = "syscon",
.num_resources = 1,
.resources = (struct resource []) {
DEFINE_RES_MEM(SYS_ID, 0x4),
},
.platform_data = &vexpress_sysreg_sys_id_pdata,
.pdata_size = sizeof(vexpress_sysreg_sys_id_pdata),
}, {
.name = "basic-mmio-gpio",
.of_compatible = "arm,vexpress-sysreg,sys_led",
.num_resources = 1,
@ -128,27 +84,11 @@ static struct mfd_cell vexpress_sysreg_cells[] = {
},
.platform_data = &vexpress_sysreg_sys_flash_pdata,
.pdata_size = sizeof(vexpress_sysreg_sys_flash_pdata),
}, {
.name = "syscon",
.num_resources = 1,
.resources = (struct resource []) {
DEFINE_RES_MEM(SYS_MISC, 0x4),
},
.platform_data = &vexpress_sysreg_sys_misc_pdata,
.pdata_size = sizeof(vexpress_sysreg_sys_misc_pdata),
}, {
.name = "syscon",
.num_resources = 1,
.resources = (struct resource []) {
DEFINE_RES_MEM(SYS_PROCID0, 0x8),
},
.platform_data = &vexpress_sysreg_sys_procid_pdata,
.pdata_size = sizeof(vexpress_sysreg_sys_procid_pdata),
}, {
.name = "vexpress-syscfg",
.num_resources = 1,
.resources = (struct resource []) {
DEFINE_RES_MEM(SYS_CFGDATA, 0xc),
DEFINE_RES_MEM(SYS_MISC, 0x4c),
},
}
};
@ -158,8 +98,6 @@ static int vexpress_sysreg_probe(struct platform_device *pdev)
struct resource *mem;
void __iomem *base;
struct gpio_chip *mmc_gpio_chip;
int master;
u32 dt_hbi;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem)
@ -169,21 +107,6 @@ static int vexpress_sysreg_probe(struct platform_device *pdev)
if (!base)
return -ENOMEM;
master = readl(base + SYS_MISC) & SYS_MISC_MASTERSITE ?
VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1;
vexpress_config_set_master(master);
/* Confirm board type against DT property, if available */
if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) {
u32 id = readl(base + (master == VEXPRESS_SITE_DB1 ?
SYS_PROCID0 : SYS_PROCID1));
u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;
if (WARN_ON(dt_hbi != hbi))
dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n",
dt_hbi, hbi);
}
/*
* Duplicated SYS_MCI pseudo-GPIO controller for compatibility with
* older trees using sysreg node for MMC control lines.
@ -195,9 +118,9 @@ static int vexpress_sysreg_probe(struct platform_device *pdev)
bgpio_init(mmc_gpio_chip, &pdev->dev, 0x4, base + SYS_MCI,
NULL, NULL, NULL, NULL, 0);
mmc_gpio_chip->ngpio = 2;
gpiochip_add_data(mmc_gpio_chip, NULL);
devm_gpiochip_add_data(&pdev->dev, mmc_gpio_chip, NULL);
return mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
vexpress_sysreg_cells,
ARRAY_SIZE(vexpress_sysreg_cells), mem, 0, NULL);
}
@ -206,6 +129,7 @@ static const struct of_device_id vexpress_sysreg_match[] = {
{ .compatible = "arm,vexpress-sysreg", },
{},
};
MODULE_DEVICE_TABLE(of, vexpress_sysreg_match);
static struct platform_driver vexpress_sysreg_driver = {
.driver = {
@ -215,14 +139,5 @@ static struct platform_driver vexpress_sysreg_driver = {
.probe = vexpress_sysreg_probe,
};
static int __init vexpress_sysreg_init(void)
{
struct device_node *node;
/* Need the sysreg early, before any other device... */
for_each_matching_node(node, vexpress_sysreg_match)
of_platform_device_create(node, NULL, NULL);
return platform_driver_register(&vexpress_sysreg_driver);
}
core_initcall(vexpress_sysreg_init);
module_platform_driver(vexpress_sysreg_driver);
MODULE_LICENSE("GPL v2");

9
drivers/misc/Kconfig
View File

@ -423,15 +423,6 @@ config SRAM
config SRAM_EXEC
bool
config VEXPRESS_SYSCFG
bool "Versatile Express System Configuration driver"
depends on VEXPRESS_CONFIG
default y
help
ARM Ltd. Versatile Express uses specialised platform configuration
bus. System Configuration interface is one of the possible means
of generating transactions on this bus.
config PCI_ENDPOINT_TEST
depends on PCI
select CRC32

1
drivers/misc/Makefile
View File

@ -49,7 +49,6 @@ obj-$(CONFIG_SRAM_EXEC) += sram-exec.o
obj-y += mic/
obj-$(CONFIG_GENWQE) += genwqe/
obj-$(CONFIG_ECHO) += echo/
obj-$(CONFIG_VEXPRESS_SYSCFG) += vexpress-syscfg.o
obj-$(CONFIG_CXL_BASE) += cxl/
obj-$(CONFIG_PCI_ENDPOINT_TEST) += pci_endpoint_test.o
obj-$(CONFIG_OCXL) += ocxl/

280
drivers/misc/vexpress-syscfg.c
View File

@ -1,280 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Copyright (C) 2014 ARM Limited
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/syscore_ops.h>
#include <linux/vexpress.h>
#define SYS_CFGDATA 0x0
#define SYS_CFGCTRL 0x4
#define SYS_CFGCTRL_START (1 << 31)
#define SYS_CFGCTRL_WRITE (1 << 30)
#define SYS_CFGCTRL_DCC(n) (((n) & 0xf) << 26)
#define SYS_CFGCTRL_FUNC(n) (((n) & 0x3f) << 20)
#define SYS_CFGCTRL_SITE(n) (((n) & 0x3) << 16)
#define SYS_CFGCTRL_POSITION(n) (((n) & 0xf) << 12)
#define SYS_CFGCTRL_DEVICE(n) (((n) & 0xfff) << 0)
#define SYS_CFGSTAT 0x8
#define SYS_CFGSTAT_ERR (1 << 1)
#define SYS_CFGSTAT_COMPLETE (1 << 0)
struct vexpress_syscfg {
struct device *dev;
void __iomem *base;
struct list_head funcs;
};
struct vexpress_syscfg_func {
struct list_head list;
struct vexpress_syscfg *syscfg;
struct regmap *regmap;
int num_templates;
u32 template[]; /* Keep it last! */
};
static int vexpress_syscfg_exec(struct vexpress_syscfg_func *func,
int index, bool write, u32 *data)
{
struct vexpress_syscfg *syscfg = func->syscfg;
u32 command, status;
int tries;
long timeout;
if (WARN_ON(index >= func->num_templates))
return -EINVAL;
command = readl(syscfg->base + SYS_CFGCTRL);
if (WARN_ON(command & SYS_CFGCTRL_START))
return -EBUSY;
command = func->template[index];
command |= SYS_CFGCTRL_START;
command |= write ? SYS_CFGCTRL_WRITE : 0;
/* Use a canary for reads */
if (!write)
*data = 0xdeadbeef;
dev_dbg(syscfg->dev, "func %p, command %x, data %x\n",
func, command, *data);
writel(*data, syscfg->base + SYS_CFGDATA);
writel(0, syscfg->base + SYS_CFGSTAT);
writel(command, syscfg->base + SYS_CFGCTRL);
mb();
/* The operation can take ages... Go to sleep, 100us initially */
tries = 100;
timeout = 100;
do {
if (!irqs_disabled()) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(usecs_to_jiffies(timeout));
if (signal_pending(current))
return -EINTR;
} else {
udelay(timeout);
}
status = readl(syscfg->base + SYS_CFGSTAT);
if (status & SYS_CFGSTAT_ERR)
return -EFAULT;
if (timeout > 20)
timeout -= 20;
} while (--tries && !(status & SYS_CFGSTAT_COMPLETE));
if (WARN_ON_ONCE(!tries))
return -ETIMEDOUT;
if (!write) {
*data = readl(syscfg->base + SYS_CFGDATA);
dev_dbg(syscfg->dev, "func %p, read data %x\n", func, *data);
}
return 0;
}
static int vexpress_syscfg_read(void *context, unsigned int index,
unsigned int *val)
{
struct vexpress_syscfg_func *func = context;
return vexpress_syscfg_exec(func, index, false, val);
}
static int vexpress_syscfg_write(void *context, unsigned int index,
unsigned int val)
{
struct vexpress_syscfg_func *func = context;
return vexpress_syscfg_exec(func, index, true, &val);
}
static struct regmap_config vexpress_syscfg_regmap_config = {
.lock = vexpress_config_lock,
.unlock = vexpress_config_unlock,
.reg_bits = 32,
.val_bits = 32,
.reg_read = vexpress_syscfg_read,
.reg_write = vexpress_syscfg_write,
.reg_format_endian = REGMAP_ENDIAN_LITTLE,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
static struct regmap *vexpress_syscfg_regmap_init(struct device *dev,
void *context)
{
int err;
struct vexpress_syscfg *syscfg = context;
struct vexpress_syscfg_func *func;
struct property *prop;
const __be32 *val = NULL;
__be32 energy_quirk[4];
int num;
u32 site, position, dcc;
int i;
err = vexpress_config_get_topo(dev->of_node, &site,
&position, &dcc);
if (err)
return ERR_PTR(err);
prop = of_find_property(dev->of_node,
"arm,vexpress-sysreg,func", NULL);
if (!prop)
return ERR_PTR(-EINVAL);
num = prop->length / sizeof(u32) / 2;
val = prop->value;
/*
* "arm,vexpress-energy" function used to be described
* by its first device only, now it requires both
*/
if (num == 1 && of_device_is_compatible(dev->of_node,
"arm,vexpress-energy")) {
num = 2;
energy_quirk[0] = *val;
energy_quirk[2] = *val++;
energy_quirk[1] = *val;
energy_quirk[3] = cpu_to_be32(be32_to_cpup(val) + 1);
val = energy_quirk;
}
func = kzalloc(struct_size(func, template, num), GFP_KERNEL);
if (!func)
return ERR_PTR(-ENOMEM);
func->syscfg = syscfg;
func->num_templates = num;
for (i = 0; i < num; i++) {
u32 function, device;
function = be32_to_cpup(val++);
device = be32_to_cpup(val++);
dev_dbg(dev, "func %p: %u/%u/%u/%u/%u\n",
func, site, position, dcc,
function, device);
func->template[i] = SYS_CFGCTRL_DCC(dcc);
func->template[i] |= SYS_CFGCTRL_SITE(site);
func->template[i] |= SYS_CFGCTRL_POSITION(position);
func->template[i] |= SYS_CFGCTRL_FUNC(function);
func->template[i] |= SYS_CFGCTRL_DEVICE(device);
}
vexpress_syscfg_regmap_config.max_register = num - 1;
func->regmap = regmap_init(dev, NULL, func,
&vexpress_syscfg_regmap_config);
if (IS_ERR(func->regmap)) {
void *err = func->regmap;
kfree(func);
return err;
}
list_add(&func->list, &syscfg->funcs);
return func->regmap;
}
static void vexpress_syscfg_regmap_exit(struct regmap *regmap, void *context)
{
struct vexpress_syscfg *syscfg = context;
struct vexpress_syscfg_func *func, *tmp;
regmap_exit(regmap);
list_for_each_entry_safe(func, tmp, &syscfg->funcs, list) {
if (func->regmap == regmap) {
list_del(&syscfg->funcs);
kfree(func);
break;
}
}
}
static struct vexpress_config_bridge_ops vexpress_syscfg_bridge_ops = {
.regmap_init = vexpress_syscfg_regmap_init,
.regmap_exit = vexpress_syscfg_regmap_exit,
};
static int vexpress_syscfg_probe(struct platform_device *pdev)
{
struct vexpress_syscfg *syscfg;
struct resource *res;
struct device *bridge;
syscfg = devm_kzalloc(&pdev->dev, sizeof(*syscfg), GFP_KERNEL);
if (!syscfg)
return -ENOMEM;
syscfg->dev = &pdev->dev;
INIT_LIST_HEAD(&syscfg->funcs);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
syscfg->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(syscfg->base))
return PTR_ERR(syscfg->base);
/* Must use dev.parent (MFD), as that's where DT phandle points at... */
bridge = vexpress_config_bridge_register(pdev->dev.parent,
&vexpress_syscfg_bridge_ops, syscfg);
return PTR_ERR_OR_ZERO(bridge);
}
static const struct platform_device_id vexpress_syscfg_id_table[] = {
{ "vexpress-syscfg", },
{},
};
static struct platform_driver vexpress_syscfg_driver = {
.driver.name = "vexpress-syscfg",
.id_table = vexpress_syscfg_id_table,
.probe = vexpress_syscfg_probe,
};
static int __init vexpress_syscfg_init(void)
{
return platform_driver_register(&vexpress_syscfg_driver);
}
core_initcall(vexpress_syscfg_init);

30
include/linux/vexpress.h
View File

@ -10,38 +10,8 @@
#include <linux/device.h>
#include <linux/regmap.h>
#define VEXPRESS_SITE_MB 0
#define VEXPRESS_SITE_DB1 1
#define VEXPRESS_SITE_DB2 2
#define VEXPRESS_SITE_MASTER 0xf
/* Config infrastructure */
void vexpress_config_set_master(u32 site);
u32 vexpress_config_get_master(void);
void vexpress_config_lock(void *arg);
void vexpress_config_unlock(void *arg);
int vexpress_config_get_topo(struct device_node *node, u32 *site,
u32 *position, u32 *dcc);
/* Config bridge API */
struct vexpress_config_bridge_ops {
struct regmap * (*regmap_init)(struct device *dev, void *context);
void (*regmap_exit)(struct regmap *regmap, void *context);
};
struct device *vexpress_config_bridge_register(struct device *parent,
struct vexpress_config_bridge_ops *ops, void *context);
/* Config regmap API */
struct regmap *devm_regmap_init_vexpress_config(struct device *dev);
/* Platform control */
void vexpress_flags_set(u32 data);
#endif