![Jingoo Han](/assets/img/avatar_default.png)
devm_request_and_ioremap() was obsoleted by the commit 7509657
("lib: devres: Introduce devm_ioremap_resource()") and has been
deprecated for a long time. So, let's remove this function.
In addition, all usages of devm_request_and_ioremap() are also
removed.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
290 lines
7.3 KiB
C
290 lines
7.3 KiB
C
/*
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* Copyright (C) 2014 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/sysfs.h>
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#include <linux/io.h>
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#include <linux/string.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/of.h>
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#include <linux/bitops.h>
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#include <asm/bug.h>
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#include <asm/signal.h>
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#define ARB_TIMER 0x008
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#define ARB_ERR_CAP_CLR 0x7e4
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#define ARB_ERR_CAP_CLEAR (1 << 0)
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#define ARB_ERR_CAP_HI_ADDR 0x7e8
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#define ARB_ERR_CAP_ADDR 0x7ec
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#define ARB_ERR_CAP_DATA 0x7f0
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#define ARB_ERR_CAP_STATUS 0x7f4
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#define ARB_ERR_CAP_STATUS_TIMEOUT (1 << 12)
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#define ARB_ERR_CAP_STATUS_TEA (1 << 11)
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#define ARB_ERR_CAP_STATUS_BS_SHIFT (1 << 2)
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#define ARB_ERR_CAP_STATUS_BS_MASK 0x3c
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#define ARB_ERR_CAP_STATUS_WRITE (1 << 1)
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#define ARB_ERR_CAP_STATUS_VALID (1 << 0)
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#define ARB_ERR_CAP_MASTER 0x7f8
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struct brcmstb_gisb_arb_device {
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void __iomem *base;
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struct mutex lock;
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struct list_head next;
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u32 valid_mask;
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const char *master_names[sizeof(u32) * BITS_PER_BYTE];
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};
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static LIST_HEAD(brcmstb_gisb_arb_device_list);
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static ssize_t gisb_arb_get_timeout(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
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u32 timeout;
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mutex_lock(&gdev->lock);
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timeout = ioread32(gdev->base + ARB_TIMER);
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mutex_unlock(&gdev->lock);
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return sprintf(buf, "%d", timeout);
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}
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static ssize_t gisb_arb_set_timeout(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct brcmstb_gisb_arb_device *gdev = platform_get_drvdata(pdev);
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int val, ret;
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ret = kstrtoint(buf, 10, &val);
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if (ret < 0)
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return ret;
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if (val == 0 || val >= 0xffffffff)
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return -EINVAL;
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mutex_lock(&gdev->lock);
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iowrite32(val, gdev->base + ARB_TIMER);
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mutex_unlock(&gdev->lock);
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return count;
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}
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static const char *
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brcmstb_gisb_master_to_str(struct brcmstb_gisb_arb_device *gdev,
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u32 masters)
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{
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u32 mask = gdev->valid_mask & masters;
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if (hweight_long(mask) != 1)
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return NULL;
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return gdev->master_names[ffs(mask) - 1];
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}
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static int brcmstb_gisb_arb_decode_addr(struct brcmstb_gisb_arb_device *gdev,
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const char *reason)
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{
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u32 cap_status;
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unsigned long arb_addr;
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u32 master;
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const char *m_name;
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char m_fmt[11];
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cap_status = ioread32(gdev->base + ARB_ERR_CAP_STATUS);
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/* Invalid captured address, bail out */
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if (!(cap_status & ARB_ERR_CAP_STATUS_VALID))
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return 1;
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/* Read the address and master */
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arb_addr = ioread32(gdev->base + ARB_ERR_CAP_ADDR) & 0xffffffff;
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#if (IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT))
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arb_addr |= (u64)ioread32(gdev->base + ARB_ERR_CAP_HI_ADDR) << 32;
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#endif
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master = ioread32(gdev->base + ARB_ERR_CAP_MASTER);
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m_name = brcmstb_gisb_master_to_str(gdev, master);
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if (!m_name) {
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snprintf(m_fmt, sizeof(m_fmt), "0x%08x", master);
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m_name = m_fmt;
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}
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pr_crit("%s: %s at 0x%lx [%c %s], core: %s\n",
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__func__, reason, arb_addr,
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cap_status & ARB_ERR_CAP_STATUS_WRITE ? 'W' : 'R',
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cap_status & ARB_ERR_CAP_STATUS_TIMEOUT ? "timeout" : "",
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m_name);
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/* clear the GISB error */
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iowrite32(ARB_ERR_CAP_CLEAR, gdev->base + ARB_ERR_CAP_CLR);
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return 0;
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}
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static int brcmstb_bus_error_handler(unsigned long addr, unsigned int fsr,
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struct pt_regs *regs)
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{
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int ret = 0;
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struct brcmstb_gisb_arb_device *gdev;
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/* iterate over each GISB arb registered handlers */
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list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next)
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ret |= brcmstb_gisb_arb_decode_addr(gdev, "bus error");
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/*
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* If it was an imprecise abort, then we need to correct the
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* return address to be _after_ the instruction.
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*/
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if (fsr & (1 << 10))
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regs->ARM_pc += 4;
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return ret;
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}
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void __init brcmstb_hook_fault_code(void)
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{
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hook_fault_code(22, brcmstb_bus_error_handler, SIGBUS, 0,
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"imprecise external abort");
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}
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static irqreturn_t brcmstb_gisb_timeout_handler(int irq, void *dev_id)
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{
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brcmstb_gisb_arb_decode_addr(dev_id, "timeout");
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return IRQ_HANDLED;
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}
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static irqreturn_t brcmstb_gisb_tea_handler(int irq, void *dev_id)
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{
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brcmstb_gisb_arb_decode_addr(dev_id, "target abort");
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return IRQ_HANDLED;
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}
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static DEVICE_ATTR(gisb_arb_timeout, S_IWUSR | S_IRUGO,
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gisb_arb_get_timeout, gisb_arb_set_timeout);
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static struct attribute *gisb_arb_sysfs_attrs[] = {
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&dev_attr_gisb_arb_timeout.attr,
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NULL,
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};
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static struct attribute_group gisb_arb_sysfs_attr_group = {
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.attrs = gisb_arb_sysfs_attrs,
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};
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static int brcmstb_gisb_arb_probe(struct platform_device *pdev)
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{
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struct device_node *dn = pdev->dev.of_node;
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struct brcmstb_gisb_arb_device *gdev;
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struct resource *r;
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int err, timeout_irq, tea_irq;
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unsigned int num_masters, j = 0;
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int i, first, last;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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timeout_irq = platform_get_irq(pdev, 0);
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tea_irq = platform_get_irq(pdev, 1);
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gdev = devm_kzalloc(&pdev->dev, sizeof(*gdev), GFP_KERNEL);
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if (!gdev)
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return -ENOMEM;
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mutex_init(&gdev->lock);
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INIT_LIST_HEAD(&gdev->next);
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gdev->base = devm_ioremap_resource(&pdev->dev, r);
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if (IS_ERR(gdev->base))
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return PTR_ERR(gdev->base);
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err = devm_request_irq(&pdev->dev, timeout_irq,
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brcmstb_gisb_timeout_handler, 0, pdev->name,
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gdev);
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if (err < 0)
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return err;
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err = devm_request_irq(&pdev->dev, tea_irq,
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brcmstb_gisb_tea_handler, 0, pdev->name,
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gdev);
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if (err < 0)
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return err;
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/* If we do not have a valid mask, assume all masters are enabled */
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if (of_property_read_u32(dn, "brcm,gisb-arb-master-mask",
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&gdev->valid_mask))
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gdev->valid_mask = 0xffffffff;
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/* Proceed with reading the litteral names if we agree on the
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* number of masters
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*/
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num_masters = of_property_count_strings(dn,
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"brcm,gisb-arb-master-names");
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if (hweight_long(gdev->valid_mask) == num_masters) {
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first = ffs(gdev->valid_mask) - 1;
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last = fls(gdev->valid_mask) - 1;
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for (i = first; i < last; i++) {
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if (!(gdev->valid_mask & BIT(i)))
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continue;
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of_property_read_string_index(dn,
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"brcm,gisb-arb-master-names", j,
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&gdev->master_names[i]);
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j++;
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}
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}
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err = sysfs_create_group(&pdev->dev.kobj, &gisb_arb_sysfs_attr_group);
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if (err)
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return err;
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platform_set_drvdata(pdev, gdev);
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list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list);
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dev_info(&pdev->dev, "registered mem: %p, irqs: %d, %d\n",
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gdev->base, timeout_irq, tea_irq);
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return 0;
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}
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static const struct of_device_id brcmstb_gisb_arb_of_match[] = {
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{ .compatible = "brcm,gisb-arb" },
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{ },
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};
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static struct platform_driver brcmstb_gisb_arb_driver = {
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.probe = brcmstb_gisb_arb_probe,
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.driver = {
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.name = "brcm-gisb-arb",
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.owner = THIS_MODULE,
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.of_match_table = brcmstb_gisb_arb_of_match,
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},
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};
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static int __init brcm_gisb_driver_init(void)
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{
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return platform_driver_register(&brcmstb_gisb_arb_driver);
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}
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module_init(brcm_gisb_driver_init);
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