linux/drivers/bus/brcmstb_gisb.c
Linus Torvalds e6b5be2be4 Driver core patches for 3.19-rc1
Here's the set of driver core patches for 3.19-rc1.
 
 They are dominated by the removal of the .owner field in platform
 drivers.  They touch a lot of files, but they are "simple" changes, just
 removing a line in a structure.
 
 Other than that, a few minor driver core and debugfs changes.  There are
 some ath9k patches coming in through this tree that have been acked by
 the wireless maintainers as they relied on the debugfs changes.
 
 Everything has been in linux-next for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg KH:
 "Here's the set of driver core patches for 3.19-rc1.

  They are dominated by the removal of the .owner field in platform
  drivers.  They touch a lot of files, but they are "simple" changes,
  just removing a line in a structure.

  Other than that, a few minor driver core and debugfs changes.  There
  are some ath9k patches coming in through this tree that have been
  acked by the wireless maintainers as they relied on the debugfs
  changes.

  Everything has been in linux-next for a while"

* tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits)
  Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries"
  fs: debugfs: add forward declaration for struct device type
  firmware class: Deletion of an unnecessary check before the function call "vunmap"
  firmware loader: fix hung task warning dump
  devcoredump: provide a one-way disable function
  device: Add dev_<level>_once variants
  ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries
  ath: use seq_file api for ath9k debugfs files
  debugfs: add helper function to create device related seq_file
  drivers/base: cacheinfo: remove noisy error boot message
  Revert "core: platform: add warning if driver has no owner"
  drivers: base: support cpu cache information interface to userspace via sysfs
  drivers: base: add cpu_device_create to support per-cpu devices
  topology: replace custom attribute macros with standard DEVICE_ATTR*
  cpumask: factor out show_cpumap into separate helper function
  driver core: Fix unbalanced device reference in drivers_probe
  driver core: fix race with userland in device_add()
  sysfs/kernfs: make read requests on pre-alloc files use the buffer.
  sysfs/kernfs: allow attributes to request write buffer be pre-allocated.
  fs: sysfs: return EGBIG on write if offset is larger than file size
  ...
2014-12-14 16:10:09 -08:00

404 lines
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);