404 строки
10 KiB
C
404 строки
10 KiB
C
/*
|
|
* Copyright (C) 2014 Broadcom Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/io.h>
|
|
#include <linux/string.h>
|
|
#include <linux/device.h>
|
|
#include <linux/list.h>
|
|
#include <linux/of.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/pm.h>
|
|
|
|
#ifdef CONFIG_ARM
|
|
#include <asm/bug.h>
|
|
#include <asm/signal.h>
|
|
#endif
|
|
|
|
#define ARB_ERR_CAP_CLEAR (1 << 0)
|
|
#define ARB_ERR_CAP_STATUS_TIMEOUT (1 << 12)
|
|
#define ARB_ERR_CAP_STATUS_TEA (1 << 11)
|
|
#define ARB_ERR_CAP_STATUS_BS_SHIFT (1 << 2)
|
|
#define ARB_ERR_CAP_STATUS_BS_MASK 0x3c
|
|
#define ARB_ERR_CAP_STATUS_WRITE (1 << 1)
|
|
#define ARB_ERR_CAP_STATUS_VALID (1 << 0)
|
|
|
|
enum {
|
|
ARB_TIMER,
|
|
ARB_ERR_CAP_CLR,
|
|
ARB_ERR_CAP_HI_ADDR,
|
|
ARB_ERR_CAP_ADDR,
|
|
ARB_ERR_CAP_DATA,
|
|
ARB_ERR_CAP_STATUS,
|
|
ARB_ERR_CAP_MASTER,
|
|
};
|
|
|
|
static const int gisb_offsets_bcm7038[] = {
|
|
[ARB_TIMER] = 0x00c,
|
|
[ARB_ERR_CAP_CLR] = 0x0c4,
|
|
[ARB_ERR_CAP_HI_ADDR] = -1,
|
|
[ARB_ERR_CAP_ADDR] = 0x0c8,
|
|
[ARB_ERR_CAP_DATA] = 0x0cc,
|
|
[ARB_ERR_CAP_STATUS] = 0x0d0,
|
|
[ARB_ERR_CAP_MASTER] = -1,
|
|
};
|
|
|
|
static const int gisb_offsets_bcm7400[] = {
|
|
[ARB_TIMER] = 0x00c,
|
|
[ARB_ERR_CAP_CLR] = 0x0c8,
|
|
[ARB_ERR_CAP_HI_ADDR] = -1,
|
|
[ARB_ERR_CAP_ADDR] = 0x0cc,
|
|
[ARB_ERR_CAP_DATA] = 0x0d0,
|
|
[ARB_ERR_CAP_STATUS] = 0x0d4,
|
|
[ARB_ERR_CAP_MASTER] = 0x0d8,
|
|
};
|
|
|
|
static const int gisb_offsets_bcm7435[] = {
|
|
[ARB_TIMER] = 0x00c,
|
|
[ARB_ERR_CAP_CLR] = 0x168,
|
|
[ARB_ERR_CAP_HI_ADDR] = -1,
|
|
[ARB_ERR_CAP_ADDR] = 0x16c,
|
|
[ARB_ERR_CAP_DATA] = 0x170,
|
|
[ARB_ERR_CAP_STATUS] = 0x174,
|
|
[ARB_ERR_CAP_MASTER] = 0x178,
|
|
};
|
|
|
|
static const int gisb_offsets_bcm7445[] = {
|
|
[ARB_TIMER] = 0x008,
|
|
[ARB_ERR_CAP_CLR] = 0x7e4,
|
|
[ARB_ERR_CAP_HI_ADDR] = 0x7e8,
|
|
[ARB_ERR_CAP_ADDR] = 0x7ec,
|
|
[ARB_ERR_CAP_DATA] = 0x7f0,
|
|
[ARB_ERR_CAP_STATUS] = 0x7f4,
|
|
[ARB_ERR_CAP_MASTER] = 0x7f8,
|
|
};
|
|
|
|
struct brcmstb_gisb_arb_device {
|
|
void __iomem *base;
|
|
const int *gisb_offsets;
|
|
struct mutex lock;
|
|
struct list_head next;
|
|
u32 valid_mask;
|
|
const char *master_names[sizeof(u32) * BITS_PER_BYTE];
|
|
u32 saved_timeout;
|
|
};
|
|
|
|
static LIST_HEAD(brcmstb_gisb_arb_device_list);
|
|
|
|
static u32 gisb_read(struct brcmstb_gisb_arb_device *gdev, int reg)
|
|
{
|
|
int offset = gdev->gisb_offsets[reg];
|
|
|
|
/* return 1 if the hardware doesn't have ARB_ERR_CAP_MASTER */
|
|
if (offset == -1)
|
|
return 1;
|
|
|
|
return ioread32(gdev->base + offset);
|
|
}
|
|
|
|
static void gisb_write(struct brcmstb_gisb_arb_device *gdev, u32 val, int reg)
|
|
{
|
|
int offset = gdev->gisb_offsets[reg];
|
|
|
|
if (offset == -1)
|
|
return;
|
|
iowrite32(val, gdev->base + reg);
|
|
}
|
|
|
|
static ssize_t gisb_arb_get_timeout(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
|
|
u32 timeout;
|
|
|
|
mutex_lock(&gdev->lock);
|
|
timeout = gisb_read(gdev, ARB_TIMER);
|
|
mutex_unlock(&gdev->lock);
|
|
|
|
return sprintf(buf, "%d", timeout);
|
|
}
|
|
|
|
static ssize_t gisb_arb_set_timeout(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
|
|
int val, ret;
|
|
|
|
ret = kstrtoint(buf, 10, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (val == 0 || val >= 0xffffffff)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&gdev->lock);
|
|
gisb_write(gdev, val, ARB_TIMER);
|
|
mutex_unlock(&gdev->lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const char *
|
|
brcmstb_gisb_master_to_str(struct brcmstb_gisb_arb_device *gdev,
|
|
u32 masters)
|
|
{
|
|
u32 mask = gdev->valid_mask & masters;
|
|
|
|
if (hweight_long(mask) != 1)
|
|
return NULL;
|
|
|
|
return gdev->master_names[ffs(mask) - 1];
|
|
}
|
|
|
|
static int brcmstb_gisb_arb_decode_addr(struct brcmstb_gisb_arb_device *gdev,
|
|
const char *reason)
|
|
{
|
|
u32 cap_status;
|
|
unsigned long arb_addr;
|
|
u32 master;
|
|
const char *m_name;
|
|
char m_fmt[11];
|
|
|
|
cap_status = gisb_read(gdev, ARB_ERR_CAP_STATUS);
|
|
|
|
/* Invalid captured address, bail out */
|
|
if (!(cap_status & ARB_ERR_CAP_STATUS_VALID))
|
|
return 1;
|
|
|
|
/* Read the address and master */
|
|
arb_addr = gisb_read(gdev, ARB_ERR_CAP_ADDR) & 0xffffffff;
|
|
#if (IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT))
|
|
arb_addr |= (u64)gisb_read(gdev, ARB_ERR_CAP_HI_ADDR) << 32;
|
|
#endif
|
|
master = gisb_read(gdev, ARB_ERR_CAP_MASTER);
|
|
|
|
m_name = brcmstb_gisb_master_to_str(gdev, master);
|
|
if (!m_name) {
|
|
snprintf(m_fmt, sizeof(m_fmt), "0x%08x", master);
|
|
m_name = m_fmt;
|
|
}
|
|
|
|
pr_crit("%s: %s at 0x%lx [%c %s], core: %s\n",
|
|
__func__, reason, arb_addr,
|
|
cap_status & ARB_ERR_CAP_STATUS_WRITE ? 'W' : 'R',
|
|
cap_status & ARB_ERR_CAP_STATUS_TIMEOUT ? "timeout" : "",
|
|
m_name);
|
|
|
|
/* clear the GISB error */
|
|
gisb_write(gdev, ARB_ERR_CAP_CLEAR, ARB_ERR_CAP_CLR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ARM
|
|
static int brcmstb_bus_error_handler(unsigned long addr, unsigned int fsr,
|
|
struct pt_regs *regs)
|
|
{
|
|
int ret = 0;
|
|
struct brcmstb_gisb_arb_device *gdev;
|
|
|
|
/* iterate over each GISB arb registered handlers */
|
|
list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next)
|
|
ret |= brcmstb_gisb_arb_decode_addr(gdev, "bus error");
|
|
/*
|
|
* If it was an imprecise abort, then we need to correct the
|
|
* return address to be _after_ the instruction.
|
|
*/
|
|
if (fsr & (1 << 10))
|
|
regs->ARM_pc += 4;
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static irqreturn_t brcmstb_gisb_timeout_handler(int irq, void *dev_id)
|
|
{
|
|
brcmstb_gisb_arb_decode_addr(dev_id, "timeout");
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t brcmstb_gisb_tea_handler(int irq, void *dev_id)
|
|
{
|
|
brcmstb_gisb_arb_decode_addr(dev_id, "target abort");
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static DEVICE_ATTR(gisb_arb_timeout, S_IWUSR | S_IRUGO,
|
|
gisb_arb_get_timeout, gisb_arb_set_timeout);
|
|
|
|
static struct attribute *gisb_arb_sysfs_attrs[] = {
|
|
&dev_attr_gisb_arb_timeout.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group gisb_arb_sysfs_attr_group = {
|
|
.attrs = gisb_arb_sysfs_attrs,
|
|
};
|
|
|
|
static const struct of_device_id brcmstb_gisb_arb_of_match[] = {
|
|
{ .compatible = "brcm,gisb-arb", .data = gisb_offsets_bcm7445 },
|
|
{ .compatible = "brcm,bcm7445-gisb-arb", .data = gisb_offsets_bcm7445 },
|
|
{ .compatible = "brcm,bcm7435-gisb-arb", .data = gisb_offsets_bcm7435 },
|
|
{ .compatible = "brcm,bcm7400-gisb-arb", .data = gisb_offsets_bcm7400 },
|
|
{ .compatible = "brcm,bcm7038-gisb-arb", .data = gisb_offsets_bcm7038 },
|
|
{ },
|
|
};
|
|
|
|
static int __init brcmstb_gisb_arb_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *dn = pdev->dev.of_node;
|
|
struct brcmstb_gisb_arb_device *gdev;
|
|
const struct of_device_id *of_id;
|
|
struct resource *r;
|
|
int err, timeout_irq, tea_irq;
|
|
unsigned int num_masters, j = 0;
|
|
int i, first, last;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
timeout_irq = platform_get_irq(pdev, 0);
|
|
tea_irq = platform_get_irq(pdev, 1);
|
|
|
|
gdev = devm_kzalloc(&pdev->dev, sizeof(*gdev), GFP_KERNEL);
|
|
if (!gdev)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&gdev->lock);
|
|
INIT_LIST_HEAD(&gdev->next);
|
|
|
|
gdev->base = devm_ioremap_resource(&pdev->dev, r);
|
|
if (IS_ERR(gdev->base))
|
|
return PTR_ERR(gdev->base);
|
|
|
|
of_id = of_match_node(brcmstb_gisb_arb_of_match, dn);
|
|
if (!of_id) {
|
|
pr_err("failed to look up compatible string\n");
|
|
return -EINVAL;
|
|
}
|
|
gdev->gisb_offsets = of_id->data;
|
|
|
|
err = devm_request_irq(&pdev->dev, timeout_irq,
|
|
brcmstb_gisb_timeout_handler, 0, pdev->name,
|
|
gdev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = devm_request_irq(&pdev->dev, tea_irq,
|
|
brcmstb_gisb_tea_handler, 0, pdev->name,
|
|
gdev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* If we do not have a valid mask, assume all masters are enabled */
|
|
if (of_property_read_u32(dn, "brcm,gisb-arb-master-mask",
|
|
&gdev->valid_mask))
|
|
gdev->valid_mask = 0xffffffff;
|
|
|
|
/* Proceed with reading the litteral names if we agree on the
|
|
* number of masters
|
|
*/
|
|
num_masters = of_property_count_strings(dn,
|
|
"brcm,gisb-arb-master-names");
|
|
if (hweight_long(gdev->valid_mask) == num_masters) {
|
|
first = ffs(gdev->valid_mask) - 1;
|
|
last = fls(gdev->valid_mask) - 1;
|
|
|
|
for (i = first; i < last; i++) {
|
|
if (!(gdev->valid_mask & BIT(i)))
|
|
continue;
|
|
|
|
of_property_read_string_index(dn,
|
|
"brcm,gisb-arb-master-names", j,
|
|
&gdev->master_names[i]);
|
|
j++;
|
|
}
|
|
}
|
|
|
|
err = sysfs_create_group(&pdev->dev.kobj, &gisb_arb_sysfs_attr_group);
|
|
if (err)
|
|
return err;
|
|
|
|
platform_set_drvdata(pdev, gdev);
|
|
|
|
list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list);
|
|
|
|
#ifdef CONFIG_ARM
|
|
hook_fault_code(22, brcmstb_bus_error_handler, SIGBUS, 0,
|
|
"imprecise external abort");
|
|
#endif
|
|
|
|
dev_info(&pdev->dev, "registered mem: %p, irqs: %d, %d\n",
|
|
gdev->base, timeout_irq, tea_irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int brcmstb_gisb_arb_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
|
|
|
|
gdev->saved_timeout = gisb_read(gdev, ARB_TIMER);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Make sure we provide the same timeout value that was configured before, and
|
|
* do this before the GISB timeout interrupt handler has any chance to run.
|
|
*/
|
|
static int brcmstb_gisb_arb_resume_noirq(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
|
|
|
|
gisb_write(gdev, gdev->saved_timeout, ARB_TIMER);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define brcmstb_gisb_arb_suspend NULL
|
|
#define brcmstb_gisb_arb_resume_noirq NULL
|
|
#endif
|
|
|
|
static const struct dev_pm_ops brcmstb_gisb_arb_pm_ops = {
|
|
.suspend = brcmstb_gisb_arb_suspend,
|
|
.resume_noirq = brcmstb_gisb_arb_resume_noirq,
|
|
};
|
|
|
|
static struct platform_driver brcmstb_gisb_arb_driver = {
|
|
.driver = {
|
|
.name = "brcm-gisb-arb",
|
|
.of_match_table = brcmstb_gisb_arb_of_match,
|
|
.pm = &brcmstb_gisb_arb_pm_ops,
|
|
},
|
|
};
|
|
|
|
static int __init brcm_gisb_driver_init(void)
|
|
{
|
|
return platform_driver_probe(&brcmstb_gisb_arb_driver,
|
|
brcmstb_gisb_arb_probe);
|
|
}
|
|
|
|
module_init(brcm_gisb_driver_init);
|