242 lines
6.7 KiB
C
242 lines
6.7 KiB
C
/*
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* Copyright (c) 2013-2018, NVIDIA CORPORATION. All rights reserved.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#define HIER_GROUP_CPU_ENABLE 0x00000000
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#define HIER_GROUP_CPU_STATUS 0x00000004
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#define HIER_GROUP1_MSELECT_ERROR 15
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#define MSELECT_CONFIG_0 0x0
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#define MSELECT_CONFIG_0_READ_TIMEOUT_EN_SLAVE0_SHIFT 16
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#define MSELECT_CONFIG_0_WRITE_TIMEOUT_EN_SLAVE0_SHIFT 17
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#define MSELECT_CONFIG_0_READ_TIMEOUT_EN_SLAVE1_SHIFT 18
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#define MSELECT_CONFIG_0_WRITE_TIMEOUT_EN_SLAVE1_SHIFT 19
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#define MSELECT_CONFIG_0_READ_TIMEOUT_EN_SLAVE2_SHIFT 20
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#define MSELECT_CONFIG_0_WRITE_TIMEOUT_EN_SLAVE2_SHIFT 21
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#define MSELECT_CONFIG_0_ERR_RESP_EN_SLAVE1_SHIFT 24
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#define MSELECT_CONFIG_0_ERR_RESP_EN_SLAVE2_SHIFT 25
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#define MSELECT_TIMEOUT_TIMER_0 0x5c
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#define MSELECT_ERROR_STATUS_0 0x60
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#define MSELECT_DEFAULT_TIMEOUT 0xFFFFFF
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struct tegra_mselect_control {
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u32 irq;
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u32 mselect_timeout_cycles;
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void __iomem *mselect_base;
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};
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static irqreturn_t tegra_mselect_irq_handler(int irq, void *data)
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{
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struct device *dev = data;
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struct tegra_mselect_control *msel = dev_get_drvdata(dev);
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unsigned long status;
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status = readl(msel->mselect_base + MSELECT_ERROR_STATUS_0);
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if (status != 0) {
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pr_err("MSELECT error detected! status=0x%x\n",
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(unsigned int)status);
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BUG();
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}
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return IRQ_HANDLED;
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}
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static int tegra_mselect_map_memory(struct device *dp,
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struct tegra_mselect_control *msel)
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{
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msel->mselect_base = of_iomap(dp->of_node, 0);
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if (!msel->mselect_base) {
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dev_err(dp, "Unable to map memory (mselect).\n");
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return -EBUSY;
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}
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return 0;
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}
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static int tegra_mselect_irq_init(struct platform_device *pdev,
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struct tegra_mselect_control *msel)
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{
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int ret;
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msel->irq = platform_get_irq(pdev, 0);
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if (msel->irq <= 0)
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return -EBUSY;
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ret = devm_request_irq(&pdev->dev, msel->irq,
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tegra_mselect_irq_handler, IRQF_TRIGGER_HIGH,
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"mselect_irq", &pdev->dev);
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if (ret) {
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dev_err(&pdev->dev,
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"Unable to request interrupt for device (err=%d).\n",
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ret);
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return ret;
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}
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return 0;
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}
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static void tegra_mselect_set_timeout(struct tegra_mselect_control *msel,
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u32 timeout_cycles)
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{
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msel->mselect_timeout_cycles = timeout_cycles;
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writel(msel->mselect_timeout_cycles, msel->mselect_base +
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MSELECT_TIMEOUT_TIMER_0);
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}
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static int tegra_mselect_timeout_init(struct tegra_mselect_control *msel)
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{
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unsigned long reg;
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tegra_mselect_set_timeout(msel, MSELECT_DEFAULT_TIMEOUT);
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reg = readl(msel->mselect_base + MSELECT_CONFIG_0);
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writel(reg |
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((1 << MSELECT_CONFIG_0_READ_TIMEOUT_EN_SLAVE0_SHIFT) |
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(1 << MSELECT_CONFIG_0_WRITE_TIMEOUT_EN_SLAVE0_SHIFT) |
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(1 << MSELECT_CONFIG_0_READ_TIMEOUT_EN_SLAVE1_SHIFT) |
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(1 << MSELECT_CONFIG_0_WRITE_TIMEOUT_EN_SLAVE1_SHIFT) |
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(1 << MSELECT_CONFIG_0_READ_TIMEOUT_EN_SLAVE2_SHIFT) |
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(1 << MSELECT_CONFIG_0_WRITE_TIMEOUT_EN_SLAVE2_SHIFT) |
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(1 << MSELECT_CONFIG_0_ERR_RESP_EN_SLAVE1_SHIFT) |
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(1 << MSELECT_CONFIG_0_ERR_RESP_EN_SLAVE2_SHIFT)),
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msel->mselect_base + MSELECT_CONFIG_0);
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return 0;
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}
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static ssize_t mselect_timeout_show(struct device *device,
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struct device_attribute *attr, char *buf)
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{
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struct tegra_mselect_control *msel = dev_get_drvdata(device);
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return sprintf(buf, "%d\n", msel->mselect_timeout_cycles);
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}
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static ssize_t mselect_timeout_store(struct device *device,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct tegra_mselect_control *msel = dev_get_drvdata(device);
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unsigned long val = 0;
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if (kstrtoul(buf, 10, &val) < 0)
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return -EINVAL;
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tegra_mselect_set_timeout(msel, val);
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return count;
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}
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static DEVICE_ATTR(mselect_timeout, S_IWUSR | S_IRUGO, mselect_timeout_show,
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mselect_timeout_store);
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static void tegra_mselect_create_sysfs(struct platform_device *pdev)
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{
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int error;
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error = device_create_file(&pdev->dev, &dev_attr_mselect_timeout);
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if (error)
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dev_err(&pdev->dev, "Failed to create sysfs attributes!\n");
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}
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static void tegra_mselect_remove_sysfs(struct platform_device *pdev)
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{
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device_remove_file(&pdev->dev, &dev_attr_mselect_timeout);
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}
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static int tegra_mselect_probe(struct platform_device *pdev)
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{
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struct tegra_mselect_control *msel;
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int ret;
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msel = devm_kzalloc(&pdev->dev, sizeof(struct tegra_mselect_control),
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GFP_KERNEL);
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if (!msel)
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return -ENOMEM;
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ret = tegra_mselect_map_memory(&pdev->dev, msel);
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if (ret)
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return ret;
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ret = tegra_mselect_timeout_init(msel);
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if (ret)
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return ret;
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dev_set_drvdata(&pdev->dev, msel);
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ret = tegra_mselect_irq_init(pdev, msel);
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if (ret)
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return ret;
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tegra_mselect_create_sysfs(pdev);
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dev_notice(&pdev->dev, "probed\n");
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return 0;
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}
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static int __exit tegra_mselect_remove(struct platform_device *pdev)
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{
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tegra_mselect_remove_sysfs(pdev);
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return 0;
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}
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#ifdef CONFIG_OF
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static struct of_device_id tegra_mselect_of_match[] = {
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{ .compatible = "nvidia,tegra-mselect", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, tegra_mselect_of_match);
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#endif
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static struct platform_driver tegra_mselect_driver = {
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.driver = {
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.name = "tegra-mselect",
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.of_match_table = of_match_ptr(tegra_mselect_of_match),
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.owner = THIS_MODULE,
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},
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.probe = tegra_mselect_probe,
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.remove = __exit_p(tegra_mselect_remove),
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};
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static int __init tegra_mselect_init(void)
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{
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return platform_driver_register(&tegra_mselect_driver);
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}
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static void __exit tegra_mselect_exit(void)
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{
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platform_driver_unregister(&tegra_mselect_driver);
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}
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module_init(tegra_mselect_init);
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module_exit(tegra_mselect_exit);
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MODULE_DESCRIPTION("Tegra Hierarchical Interrupt Controller Driver");
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MODULE_LICENSE("GPL v2");
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