#include <linux/init.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/panic_notifier.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>
#include <linux/kernel.h>
#include <linux/kdebug.h>
#include <linux/notifier.h>
#ifdef CONFIG_MIPS
#include <asm/traps.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_WRITE (1 << 1)
#define ARB_ERR_CAP_STATUS_VALID (1 << 0)
#define ARB_BP_CAP_CLEAR (1 << 0)
#define ARB_BP_CAP_STATUS_PROT_SHIFT 14
#define ARB_BP_CAP_STATUS_TYPE (1 << 13)
#define ARB_BP_CAP_STATUS_RSP_SHIFT 10
#define ARB_BP_CAP_STATUS_MASK GENMASK(1, 0)
#define ARB_BP_CAP_STATUS_BS_SHIFT 2
#define ARB_BP_CAP_STATUS_WRITE (1 << 1)
#define ARB_BP_CAP_STATUS_VALID (1 << 0)
enum {
ARB_TIMER,
ARB_BP_CAP_CLR,
ARB_BP_CAP_HI_ADDR,
ARB_BP_CAP_ADDR,
ARB_BP_CAP_STATUS,
ARB_BP_CAP_MASTER,
ARB_ERR_CAP_CLR,
ARB_ERR_CAP_HI_ADDR,
ARB_ERR_CAP_ADDR,
ARB_ERR_CAP_STATUS,
ARB_ERR_CAP_MASTER,
};
static const int gisb_offsets_bcm7038[] = {
[ARB_TIMER] = 0x00c,
[ARB_BP_CAP_CLR] = 0x014,
[ARB_BP_CAP_HI_ADDR] = -1,
[ARB_BP_CAP_ADDR] = 0x0b8,
[ARB_BP_CAP_STATUS] = 0x0c0,
[ARB_BP_CAP_MASTER] = -1,
[ARB_ERR_CAP_CLR] = 0x0c4,
[ARB_ERR_CAP_HI_ADDR] = -1,
[ARB_ERR_CAP_ADDR] = 0x0c8,
[ARB_ERR_CAP_STATUS] = 0x0d0,
[ARB_ERR_CAP_MASTER] = -1,
};
static const int gisb_offsets_bcm7278[] = {
[ARB_TIMER] = 0x008,
[ARB_BP_CAP_CLR] = 0x01c,
[ARB_BP_CAP_HI_ADDR] = -1,
[ARB_BP_CAP_ADDR] = 0x220,
[ARB_BP_CAP_STATUS] = 0x230,
[ARB_BP_CAP_MASTER] = 0x234,
[ARB_ERR_CAP_CLR] = 0x7f8,
[ARB_ERR_CAP_HI_ADDR] = -1,
[ARB_ERR_CAP_ADDR] = 0x7e0,
[ARB_ERR_CAP_STATUS] = 0x7f0,
[ARB_ERR_CAP_MASTER] = 0x7f4,
};
static const int gisb_offsets_bcm7400[] = {
[ARB_TIMER] = 0x00c,
[ARB_BP_CAP_CLR] = 0x014,
[ARB_BP_CAP_HI_ADDR] = -1,
[ARB_BP_CAP_ADDR] = 0x0b8,
[ARB_BP_CAP_STATUS] = 0x0c0,
[ARB_BP_CAP_MASTER] = 0x0c4,
[ARB_ERR_CAP_CLR] = 0x0c8,
[ARB_ERR_CAP_HI_ADDR] = -1,
[ARB_ERR_CAP_ADDR] = 0x0cc,
[ARB_ERR_CAP_STATUS] = 0x0d4,
[ARB_ERR_CAP_MASTER] = 0x0d8,
};
static const int gisb_offsets_bcm74165[] = {
[ARB_TIMER] = 0x008,
[ARB_BP_CAP_CLR] = 0x044,
[ARB_BP_CAP_HI_ADDR] = -1,
[ARB_BP_CAP_ADDR] = 0x048,
[ARB_BP_CAP_STATUS] = 0x058,
[ARB_BP_CAP_MASTER] = 0x05c,
[ARB_ERR_CAP_CLR] = 0x038,
[ARB_ERR_CAP_HI_ADDR] = -1,
[ARB_ERR_CAP_ADDR] = 0x020,
[ARB_ERR_CAP_STATUS] = 0x030,
[ARB_ERR_CAP_MASTER] = 0x034,
};
static const int gisb_offsets_bcm7435[] = {
[ARB_TIMER] = 0x00c,
[ARB_BP_CAP_CLR] = 0x014,
[ARB_BP_CAP_HI_ADDR] = -1,
[ARB_BP_CAP_ADDR] = 0x158,
[ARB_BP_CAP_STATUS] = 0x160,
[ARB_BP_CAP_MASTER] = 0x164,
[ARB_ERR_CAP_CLR] = 0x168,
[ARB_ERR_CAP_HI_ADDR] = -1,
[ARB_ERR_CAP_ADDR] = 0x16c,
[ARB_ERR_CAP_STATUS] = 0x174,
[ARB_ERR_CAP_MASTER] = 0x178,
};
static const int gisb_offsets_bcm7445[] = {
[ARB_TIMER] = 0x008,
[ARB_BP_CAP_CLR] = 0x010,
[ARB_BP_CAP_HI_ADDR] = -1,
[ARB_BP_CAP_ADDR] = 0x1d8,
[ARB_BP_CAP_STATUS] = 0x1e0,
[ARB_BP_CAP_MASTER] = 0x1e4,
[ARB_ERR_CAP_CLR] = 0x7e4,
[ARB_ERR_CAP_HI_ADDR] = 0x7e8,
[ARB_ERR_CAP_ADDR] = 0x7ec,
[ARB_ERR_CAP_STATUS] = 0x7f4,
[ARB_ERR_CAP_MASTER] = 0x7f8,
};
struct brcmstb_gisb_arb_device {
void __iomem *base;
const int *gisb_offsets;
bool big_endian;
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];
if (offset < 0) {
if (reg == ARB_ERR_CAP_MASTER)
return 1;
else
return 0;
}
if (gdev->big_endian)
return ioread32be(gdev->base + offset);
else
return ioread32(gdev->base + offset);
}
static u64 gisb_read_address(struct brcmstb_gisb_arb_device *gdev)
{
u64 value;
value = gisb_read(gdev, ARB_ERR_CAP_ADDR);
value |= (u64)gisb_read(gdev, ARB_ERR_CAP_HI_ADDR) << 32;
return value;
}
static u64 gisb_read_bp_address(struct brcmstb_gisb_arb_device *gdev)
{
u64 value;
value = gisb_read(gdev, ARB_BP_CAP_ADDR);
value |= (u64)gisb_read(gdev, ARB_BP_CAP_HI_ADDR) << 32;
return value;
}
static void gisb_write(struct brcmstb_gisb_arb_device *gdev, u32 val, int reg)
{
int offset = gdev->gisb_offsets[reg];
if (offset == -1)
return;
if (gdev->big_endian)
iowrite32be(val, gdev->base + offset);
else
iowrite32(val, gdev->base + offset);
}
static ssize_t gisb_arb_get_timeout(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
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 brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
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;
u64 arb_addr;
u32 master;
const char *m_name;
char m_fmt[11];
cap_status = gisb_read(gdev, ARB_ERR_CAP_STATUS);
if (!(cap_status & ARB_ERR_CAP_STATUS_VALID))
return 1;
arb_addr = gisb_read_address(gdev);
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("GISB: %s at 0x%llx [%c %s], core: %s\n",
reason, arb_addr,
cap_status & ARB_ERR_CAP_STATUS_WRITE ? 'W' : 'R',
cap_status & ARB_ERR_CAP_STATUS_TIMEOUT ? "timeout" : "",
m_name);
gisb_write(gdev, ARB_ERR_CAP_CLEAR, ARB_ERR_CAP_CLR);
return 0;
}
#ifdef CONFIG_MIPS
static int brcmstb_bus_error_handler(struct pt_regs *regs, int is_fixup)
{
int ret = 0;
struct brcmstb_gisb_arb_device *gdev;
u32 cap_status;
list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next) {
cap_status = gisb_read(gdev, ARB_ERR_CAP_STATUS);
if (!(cap_status & ARB_ERR_CAP_STATUS_VALID)) {
is_fixup = 1;
goto out;
}
ret |= brcmstb_gisb_arb_decode_addr(gdev, "bus error");
}
out:
return is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
}
#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 irqreturn_t brcmstb_gisb_bp_handler(int irq, void *dev_id)
{
struct brcmstb_gisb_arb_device *gdev = dev_id;
const char *m_name;
u32 bp_status;
u64 arb_addr;
u32 master;
char m_fmt[11];
bp_status = gisb_read(gdev, ARB_BP_CAP_STATUS);
if (!(bp_status & ARB_BP_CAP_STATUS_VALID))
return IRQ_HANDLED;
arb_addr = gisb_read_bp_address(gdev);
master = gisb_read(gdev, ARB_BP_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("GISB: breakpoint at 0x%llx [%c], core: %s\n",
arb_addr, bp_status & ARB_BP_CAP_STATUS_WRITE ? 'W' : 'R',
m_name);
gisb_write(gdev, ARB_ERR_CAP_CLEAR, ARB_ERR_CAP_CLR);
return IRQ_HANDLED;
}
static int dump_gisb_error(struct notifier_block *self, unsigned long v,
void *p);
static struct notifier_block gisb_die_notifier = {
.notifier_call = dump_gisb_error,
};
static struct notifier_block gisb_panic_notifier = {
.notifier_call = dump_gisb_error,
};
static int dump_gisb_error(struct notifier_block *self, unsigned long v,
void *p)
{
struct brcmstb_gisb_arb_device *gdev;
const char *reason = "panic";
if (self == &gisb_die_notifier)
reason = "die";
list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next)
brcmstb_gisb_arb_decode_addr(gdev, reason);
return NOTIFY_DONE;
}
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,
};
ATTRIBUTE_GROUPS(gisb_arb_sysfs);
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,bcm7278-gisb-arb", .data = gisb_offsets_bcm7278 },
{ .compatible = "brcm,bcm7038-gisb-arb", .data = gisb_offsets_bcm7038 },
{ .compatible = "brcm,bcm74165-gisb-arb", .data = gisb_offsets_bcm74165 },
{ },
};
MODULE_DEVICE_TABLE(of, brcmstb_gisb_arb_of_match);
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;
int err, timeout_irq, tea_irq, bp_irq;
unsigned int num_masters, j = 0;
int i, first, last;
timeout_irq = platform_get_irq(pdev, 0);
tea_irq = platform_get_irq(pdev, 1);
bp_irq = platform_get_irq(pdev, 2);
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_platform_get_and_ioremap_resource(pdev, 0, NULL);
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;
gdev->big_endian = of_device_is_big_endian(dn);
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 (bp_irq > 0) {
err = devm_request_irq(&pdev->dev, bp_irq,
brcmstb_gisb_bp_handler, 0, pdev->name,
gdev);
if (err < 0)
return err;
}
if (of_property_read_u32(dn, "brcm,gisb-arb-master-mask",
&gdev->valid_mask))
gdev->valid_mask = 0xffffffff;
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++;
}
}
platform_set_drvdata(pdev, gdev);
list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list);
#ifdef CONFIG_MIPS
mips_set_be_handler(brcmstb_bus_error_handler);
#endif
if (list_is_singular(&brcmstb_gisb_arb_device_list)) {
register_die_notifier(&gisb_die_notifier);
atomic_notifier_chain_register(&panic_notifier_list,
&gisb_panic_notifier);
}
dev_info(&pdev->dev, "registered irqs: %d, %d\n",
timeout_irq, tea_irq);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int brcmstb_gisb_arb_suspend(struct device *dev)
{
struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
gdev->saved_timeout = gisb_read(gdev, ARB_TIMER);
return 0;
}
static int brcmstb_gisb_arb_resume_noirq(struct device *dev)
{
struct brcmstb_gisb_arb_device *gdev = dev_get_drvdata(dev);
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,
.dev_groups = gisb_arb_sysfs_groups,
},
};
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);
MODULE_AUTHOR("Broadcom");
MODULE_DESCRIPTION("Broadcom STB GISB arbiter driver");
MODULE_LICENSE("GPL v2");
