+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * This file is provided under a dual BSD/GPLv2 license. When using or
- * redistributing this file, you may do so under either license.
- *
- * GPL LICENSE SUMMARY
- *
- * Copyright (C) 2018 Advanced Micro Devices, Inc. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * BSD LICENSE
- *
- * Copyright (C) 2018 Advanced Micro Devices, Inc. All Rights Reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copy
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of AMD Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * AMD PCIe MP2 Communication Driver
- * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
- */
-
-#include <linux/debugfs.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/slab.h>
-
-#include "i2c-amd-pci-mp2.h"
-
-#define DRIVER_NAME "pcie_mp2_amd"
-#define DRIVER_DESC "AMD(R) PCI-E MP2 Communication Driver"
-#define DRIVER_VER "1.0"
-
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_VERSION(DRIVER_VER);
-MODULE_LICENSE("Dual BSD/GPL");
-MODULE_AUTHOR("Shyam Sundar S K <Shyam-sundar.S-k@amd.com>");
-
-static const struct file_operations amd_mp2_debugfs_info;
-static struct dentry *debugfs_dir;
-
-int amd_mp2_connect(struct pci_dev *dev,
- struct i2c_connect_config connect_cfg)
-{
- struct amd_mp2_dev *privdata = pci_get_drvdata(dev);
- union i2c_cmd_base i2c_cmd_base;
- unsigned long flags;
-
- raw_spin_lock_irqsave(&privdata->lock, flags);
- dev_dbg(ndev_dev(privdata), "%s addr: %x id: %d\n", __func__,
- connect_cfg.dev_addr, connect_cfg.bus_id);
-
- i2c_cmd_base.ul = 0;
- i2c_cmd_base.s.i2c_cmd = i2c_enable;
- i2c_cmd_base.s.bus_id = connect_cfg.bus_id;
- i2c_cmd_base.s.i2c_speed = connect_cfg.i2c_speed;
-
- if (i2c_cmd_base.s.bus_id == i2c_bus_1) {
- writel(i2c_cmd_base.ul, privdata->mmio + AMD_C2P_MSG1);
- } else if (i2c_cmd_base.s.bus_id == i2c_bus_0) {
- writel(i2c_cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
- } else {
- dev_err(ndev_dev(privdata), "%s Invalid bus id\n", __func__);
- return -EINVAL;
- }
- raw_spin_unlock_irqrestore(&privdata->lock, flags);
- return 0;
-}
-EXPORT_SYMBOL_GPL(amd_mp2_connect);
-
-int amd_mp2_read(struct pci_dev *dev, struct i2c_read_config read_cfg)
-{
- struct amd_mp2_dev *privdata = pci_get_drvdata(dev);
- union i2c_cmd_base i2c_cmd_base;
-
- dev_dbg(ndev_dev(privdata), "%s addr: %x id: %d\n", __func__,
- read_cfg.dev_addr, read_cfg.bus_id);
-
- privdata->requested = true;
- i2c_cmd_base.ul = 0;
- i2c_cmd_base.s.i2c_cmd = i2c_read;
- i2c_cmd_base.s.dev_addr = read_cfg.dev_addr;
- i2c_cmd_base.s.length = read_cfg.length;
- i2c_cmd_base.s.bus_id = read_cfg.bus_id;
-
- if (read_cfg.length <= 32) {
- i2c_cmd_base.s.mem_type = use_c2pmsg;
- if (!privdata->eventval.buf) {
- dev_err(ndev_dev(privdata), "%s no mem for buf received\n",
- __func__);
- return -ENOMEM;
- }
- privdata->eventval.buf = (u32 *)read_cfg.buf;
- dev_dbg(ndev_dev(privdata), "%s buf: %llx\n", __func__,
- (u64)privdata->eventval.buf);
- } else {
- i2c_cmd_base.s.mem_type = use_dram;
- privdata->read_cfg.phy_addr = read_cfg.phy_addr;
- privdata->read_cfg.buf = read_cfg.buf;
- write64((u64)privdata->read_cfg.phy_addr,
- privdata->mmio + AMD_C2P_MSG2);
- }
-
- switch (read_cfg.i2c_speed) {
- case 0:
- i2c_cmd_base.s.i2c_speed = speed100k;
- break;
- case 1:
- i2c_cmd_base.s.i2c_speed = speed400k;
- break;
- case 2:
- i2c_cmd_base.s.i2c_speed = speed1000k;
- break;
- case 3:
- i2c_cmd_base.s.i2c_speed = speed1400k;
- break;
- case 4:
- i2c_cmd_base.s.i2c_speed = speed3400k;
- break;
- default:
- dev_err(ndev_dev(privdata), "Invalid ConnectionSpeed\n");
- }
-
- if (i2c_cmd_base.s.bus_id == i2c_bus_1) {
- writel(i2c_cmd_base.ul, privdata->mmio + AMD_C2P_MSG1);
- } else if (i2c_cmd_base.s.bus_id == i2c_bus_0) {
- writel(i2c_cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
- } else {
- dev_err(ndev_dev(privdata), "%s Invalid bus id\n", __func__);
- return -EINVAL;
- }
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(amd_mp2_read);
-
-int amd_mp2_write(struct pci_dev *dev, struct i2c_write_config write_cfg)
-{
- struct amd_mp2_dev *privdata = pci_get_drvdata(dev);
- union i2c_cmd_base i2c_cmd_base;
- int i = 0;
-
- privdata->requested = true;
- dev_dbg(ndev_dev(privdata), "%s addr: %x id: %d\n", __func__,
- write_cfg.dev_addr, write_cfg.bus_id);
-
- i2c_cmd_base.ul = 0;
- i2c_cmd_base.s.i2c_cmd = i2c_write;
- i2c_cmd_base.s.dev_addr = write_cfg.dev_addr;
- i2c_cmd_base.s.length = write_cfg.length;
- i2c_cmd_base.s.bus_id = write_cfg.bus_id;
-
- switch (write_cfg.i2c_speed) {
- case 0:
- i2c_cmd_base.s.i2c_speed = speed100k;
- break;
- case 1:
- i2c_cmd_base.s.i2c_speed = speed400k;
- break;
- case 2:
- i2c_cmd_base.s.i2c_speed = speed1000k;
- break;
- case 3:
- i2c_cmd_base.s.i2c_speed = speed1400k;
- break;
- case 4:
- i2c_cmd_base.s.i2c_speed = speed3400k;
- break;
- default:
- dev_err(ndev_dev(privdata), "Invalid ConnectionSpeed\n");
- }
-
- if (write_cfg.length <= 32) {
- i2c_cmd_base.s.mem_type = use_c2pmsg;
- for (i = 0; i < ((write_cfg.length + 3) / 4); i++) {
- writel(write_cfg.buf[i],
- privdata->mmio + (AMD_C2P_MSG2 + i * 4));
- }
- } else {
- i2c_cmd_base.s.mem_type = use_dram;
- privdata->write_cfg.phy_addr = write_cfg.phy_addr;
- write64((u64)privdata->write_cfg.phy_addr,
- privdata->mmio + AMD_C2P_MSG2);
- }
-
- if (i2c_cmd_base.s.bus_id == i2c_bus_1) {
- writel(i2c_cmd_base.ul, privdata->mmio + AMD_C2P_MSG1);
- } else if (i2c_cmd_base.s.bus_id == i2c_bus_0) {
- writel(i2c_cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
- } else {
- dev_err(ndev_dev(privdata), "%s Invalid bus id\n", __func__);
- return -EINVAL;
- }
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(amd_mp2_write);
-
-int amd_i2c_register_cb(struct pci_dev *dev, const struct amd_i2c_pci_ops *ops,
- void *dev_ctx)
-{
- struct amd_mp2_dev *privdata = pci_get_drvdata(dev);
-
- privdata->ops = ops;
- privdata->i2c_dev_ctx = dev_ctx;
-
- if (!privdata->ops || !privdata->i2c_dev_ctx)
- return -EINVAL;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(amd_i2c_register_cb);
-
-static void amd_mp2_pci_work(struct work_struct *work)
-{
- struct amd_mp2_dev *privdata = mp2_dev(work);
- u32 readdata = 0;
- int i = 0;
- int sts = privdata->eventval.r.status;
- int res = privdata->eventval.r.response;
- int len = privdata->eventval.r.length;
-
- if (res == command_success && sts == i2c_readcomplete_event) {
- if (privdata->ops->read_complete) {
- if (len <= 32) {
- for (i = 0; i < ((len + 3) / 4); i++) {
- readdata = readl(privdata->mmio +
- (AMD_C2P_MSG2 + i * 4));
- privdata->eventval.buf[i] = readdata;
- }
- privdata->ops->read_complete(privdata->eventval,
- privdata->i2c_dev_ctx);
- } else {
- privdata->ops->read_complete(privdata->eventval,
- privdata->i2c_dev_ctx);
- }
- }
- } else if (res == command_success && sts == i2c_writecomplete_event) {
- if (privdata->ops->write_complete)
- privdata->ops->write_complete(privdata->eventval,
- privdata->i2c_dev_ctx);
- } else if (res == command_success && sts == i2c_busenable_complete) {
- if (privdata->ops->connect_complete)
- privdata->ops->connect_complete(privdata->eventval,
- privdata->i2c_dev_ctx);
- } else {
- dev_err(ndev_dev(privdata), "ERROR!!nothing to be handled !\n");
- }
-}
-
-static irqreturn_t amd_mp2_irq_isr(int irq, void *dev)
-{
- struct amd_mp2_dev *privdata = dev;
- u32 val = 0;
- unsigned long flags;
-
- raw_spin_lock_irqsave(&privdata->lock, flags);
- val = readl(privdata->mmio + AMD_P2C_MSG1);
- if (val != 0) {
- writel(0, privdata->mmio + AMD_P2C_MSG_INTEN);
- privdata->eventval.ul = val;
- } else {
- val = readl(privdata->mmio + AMD_P2C_MSG2);
- if (val != 0) {
- writel(0, privdata->mmio + AMD_P2C_MSG_INTEN);
- privdata->eventval.ul = val;
- }
- }
-
- raw_spin_unlock_irqrestore(&privdata->lock, flags);
- if (!privdata->ops)
- return IRQ_NONE;
-
- if (!privdata->requested)
- return IRQ_HANDLED;
-
- privdata->requested = false;
- schedule_delayed_work(&privdata->work, 0);
-
- return IRQ_HANDLED;
-}
-
-static ssize_t amd_mp2_debugfs_read(struct file *filp, char __user *ubuf,
- size_t count, loff_t *offp)
-{
- struct amd_mp2_dev *privdata;
- void __iomem *mmio;
- u8 *buf;
- size_t buf_size;
- ssize_t ret, off;
- union {
- u64 v64;
- u32 v32;
- u16 v16;
- } u;
-
- privdata = filp->private_data;
- mmio = privdata->mmio;
- buf_size = min(count, 0x800ul);
- buf = kmalloc(buf_size, GFP_KERNEL);
-
- if (!buf)
- return -ENOMEM;
-
- off = 0;
- off += scnprintf(buf + off, buf_size - off,
- "Mp2 Device Information:\n");
-
- off += scnprintf(buf + off, buf_size - off,
- "========================\n");
- off += scnprintf(buf + off, buf_size - off,
- "\tMP2 C2P Message Register Dump:\n\n");
- u.v32 = readl(privdata->mmio + AMD_C2P_MSG0);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_C2P_MSG0 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_C2P_MSG1);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_C2P_MSG1 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_C2P_MSG2);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_C2P_MSG2 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_C2P_MSG3);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_C2P_MSG3 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_C2P_MSG4);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_C2P_MSG4 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_C2P_MSG5);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_C2P_MSG5 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_C2P_MSG6);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_C2P_MSG6 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_C2P_MSG7);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_C2P_MSG7 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_C2P_MSG8);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_C2P_MSG8 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_C2P_MSG9);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_C2P_MSG9 -\t\t\t%#06x\n", u.v32);
-
- off += scnprintf(buf + off, buf_size - off,
- "\n\tMP2 P2C Message Register Dump:\n\n");
-
- u.v32 = readl(privdata->mmio + AMD_P2C_MSG1);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_P2C_MSG1 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_P2C_MSG2);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_P2C_MSG2 -\t\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_P2C_MSG_INTEN);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_P2C_MSG_INTEN -\t\t%#06x\n", u.v32);
-
- u.v32 = readl(privdata->mmio + AMD_P2C_MSG_INTSTS);
- off += scnprintf(buf + off, buf_size - off,
- "AMD_P2C_MSG_INTSTS -\t\t%#06x\n", u.v32);
-
- ret = simple_read_from_buffer(ubuf, count, offp, buf, off);
- kfree(buf);
- return ret;
-}
-
-static void amd_mp2_init_debugfs(struct amd_mp2_dev *privdata)
-{
- if (!debugfs_dir) {
- privdata->debugfs_dir = NULL;
- privdata->debugfs_info = NULL;
- } else {
- privdata->debugfs_dir = debugfs_create_dir(ndev_name(privdata),
- debugfs_dir);
- if (!privdata->debugfs_dir) {
- privdata->debugfs_info = NULL;
- } else {
- privdata->debugfs_info = debugfs_create_file(
- "info", 0400, privdata->debugfs_dir,
- privdata, &amd_mp2_debugfs_info);
- }
- }
-}
-
-static void amd_mp2_deinit_debugfs(struct amd_mp2_dev *privdata)
-{
- debugfs_remove_recursive(privdata->debugfs_dir);
-}
-
-static void amd_mp2_clear_reg(struct amd_mp2_dev *privdata)
-{
- int reg = 0;
-
- for (reg = AMD_C2P_MSG0; reg <= AMD_C2P_MSG9; reg += 4)
- writel(0, privdata->mmio + reg);
-
- for (reg = AMD_P2C_MSG0; reg <= AMD_P2C_MSG2; reg += 4)
- writel(0, privdata->mmio + reg);
-}
-
-static int amd_mp2_pci_init(struct amd_mp2_dev *privdata, struct pci_dev *pdev)
-{
- int rc;
- int bar_index = 2;
- resource_size_t size, base;
-
- pci_set_drvdata(pdev, privdata);
-
- rc = pci_enable_device(pdev);
- if (rc)
- goto err_pci_enable;
-
- rc = pci_request_regions(pdev, DRIVER_NAME);
- if (rc)
- goto err_pci_regions;
-
- pci_set_master(pdev);
-
- rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
- if (rc) {
- rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
- if (rc)
- goto err_dma_mask;
- dev_warn(ndev_dev(privdata), "Cannot DMA highmem\n");
- }
-
- rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
- if (rc) {
- rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
- if (rc)
- goto err_dma_mask;
- dev_warn(ndev_dev(privdata), "Cannot DMA consistent highmem\n");
- }
-
- base = pci_resource_start(pdev, bar_index);
- size = pci_resource_len(pdev, bar_index);
- dev_dbg(ndev_dev(privdata), "Base addr:%llx size:%llx\n", base, size);
-
- privdata->mmio = ioremap(base, size);
- if (!privdata->mmio) {
- rc = -EIO;
- goto err_dma_mask;
- }
-
- /* Try to set up intx irq */
- pci_intx(pdev, 1);
- privdata->eventval.buf = NULL;
- privdata->requested = false;
- raw_spin_lock_init(&privdata->lock);
- rc = request_irq(pdev->irq, amd_mp2_irq_isr, IRQF_SHARED, "mp2_irq_isr",
- privdata);
- if (rc)
- goto err_intx_request;
-
- return 0;
-
-err_intx_request:
- return rc;
-err_dma_mask:
- pci_clear_master(pdev);
- pci_release_regions(pdev);
-err_pci_regions:
- pci_disable_device(pdev);
-err_pci_enable:
- pci_set_drvdata(pdev, NULL);
- return rc;
-}
-
-static void amd_mp2_pci_deinit(struct amd_mp2_dev *privdata)
-{
- struct pci_dev *pdev = ndev_pdev(privdata);
-
- pci_iounmap(pdev, privdata->mmio);
-
- pci_clear_master(pdev);
- pci_release_regions(pdev);
- pci_disable_device(pdev);
- pci_set_drvdata(pdev, NULL);
-}
-
-static int amd_mp2_pci_probe(struct pci_dev *pdev,
- const struct pci_device_id *id)
-{
- struct amd_mp2_dev *privdata;
- int rc;
-
- dev_info(&pdev->dev, "MP2 device found [%04x:%04x] (rev %x)\n",
- (int)pdev->vendor, (int)pdev->device, (int)pdev->revision);
-
- privdata = kzalloc(sizeof(*privdata), GFP_KERNEL);
- privdata->pdev = pdev;
-
- if (!privdata) {
- rc = -ENOMEM;
- goto err_dev;
- }
-
- rc = amd_mp2_pci_init(privdata, pdev);
- if (rc)
- goto err_pci_init;
- dev_dbg(&pdev->dev, "pci init done.\n");
-
- INIT_DELAYED_WORK(&privdata->work, amd_mp2_pci_work);
-
- amd_mp2_init_debugfs(privdata);
- dev_info(&pdev->dev, "MP2 device registered.\n");
- return 0;
-
-err_pci_init:
- kfree(privdata);
-err_dev:
- dev_err(&pdev->dev, "Memory Allocation Failed\n");
- return rc;
-}
-
-static void amd_mp2_pci_remove(struct pci_dev *pdev)
-{
- struct amd_mp2_dev *privdata = pci_get_drvdata(pdev);
-
- amd_mp2_deinit_debugfs(privdata);
- amd_mp2_clear_reg(privdata);
- cancel_delayed_work_sync(&privdata->work);
- free_irq(pdev->irq, privdata);
- pci_intx(pdev, 0);
- amd_mp2_pci_deinit(privdata);
- kfree(privdata);
-}
-
-static const struct file_operations amd_mp2_debugfs_info = {
- .owner = THIS_MODULE,
- .open = simple_open,
- .read = amd_mp2_debugfs_read,
-};
-
-static const struct pci_device_id amd_mp2_pci_tbl[] = {
- {PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_MP2)},
- {0}
-};
-MODULE_DEVICE_TABLE(pci, amd_mp2_pci_tbl);
-
-#ifdef CONFIG_PM_SLEEP
-static int amd_mp2_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
-{
- struct amd_mp2_dev *privdata = pci_get_drvdata(pdev);
-
- if (!privdata)
- return -EINVAL;
-
- return 0;
-}
-
-static int amd_mp2_pci_device_resume(struct pci_dev *pdev)
-{
- struct amd_mp2_dev *privdata = pci_get_drvdata(pdev);
-
- if (!privdata)
- return -EINVAL;
-
- return 0;
-}
-#endif
-
-static struct pci_driver amd_mp2_pci_driver = {
- .name = DRIVER_NAME,
- .id_table = amd_mp2_pci_tbl,
- .probe = amd_mp2_pci_probe,
- .remove = amd_mp2_pci_remove,
-#ifdef CONFIG_PM_SLEEP
- .suspend = amd_mp2_pci_device_suspend,
- .resume = amd_mp2_pci_device_resume,
-#endif
-};
-
-static int __init amd_mp2_pci_driver_init(void)
-{
- pr_info("%s: %s Version: %s\n", DRIVER_NAME, DRIVER_DESC, DRIVER_VER);
-
- if (debugfs_initialized())
- debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
-
- return pci_register_driver(&amd_mp2_pci_driver);
-}
-module_init(amd_mp2_pci_driver_init);
-
-static void __exit amd_mp2_pci_driver_exit(void)
-{
- pci_unregister_driver(&amd_mp2_pci_driver);
- debugfs_remove_recursive(debugfs_dir);
-}
-module_exit(amd_mp2_pci_driver_exit);
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0
- *
- * This file is provided under a dual BSD/GPLv2 license. When using or
- * redistributing this file, you may do so under either license.
- *
- * GPL LICENSE SUMMARY
- *
- * Copyright (C) 2018 Advanced Micro Devices, Inc. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * BSD LICENSE
- *
- * Copyright (C) 2018 Advanced Micro Devices, Inc. All Rights Reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copy
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of AMD Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * AMD PCIe MP2 Communication Interface Driver
- * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
- */
-
-#ifndef I2C_AMD_PCI_MP2_H
-#define I2C_AMD_PCI_MP2_H
-
-#include <linux/pci.h>
-
-#define PCI_DEVICE_ID_AMD_MP2 0x15E6
-
-#define write64 _write64
-static inline void _write64(u64 val, void __iomem *mmio)
-{
- writel(val, mmio);
- writel(val >> 32, mmio + sizeof(u32));
-}
-
-#define read64 _read64
-static inline u64 _read64(void __iomem *mmio)
-{
- u64 low, high;
-
- low = readl(mmio);
- high = readl(mmio + sizeof(u32));
- return low | (high << 32);
-}
-
-enum {
- /* MP2 C2P Message Registers */
- AMD_C2P_MSG0 = 0x10500, /*MP2 Message for I2C0*/
- AMD_C2P_MSG1 = 0x10504, /*MP2 Message for I2C1*/
- AMD_C2P_MSG2 = 0x10508, /*DRAM Address Lo / Data 0*/
- AMD_C2P_MSG3 = 0x1050c, /*DRAM Address HI / Data 1*/
- AMD_C2P_MSG4 = 0x10510, /*Data 2*/
- AMD_C2P_MSG5 = 0x10514, /*Data 3*/
- AMD_C2P_MSG6 = 0x10518, /*Data 4*/
- AMD_C2P_MSG7 = 0x1051c, /*Data 5*/
- AMD_C2P_MSG8 = 0x10520, /*Data 6*/
- AMD_C2P_MSG9 = 0x10524, /*Data 7*/
-
- /* MP2 P2C Message Registers */
- AMD_P2C_MSG0 = 0x10680, /*Do not use*/
- AMD_P2C_MSG1 = 0x10684, /*I2c0 int reg*/
- AMD_P2C_MSG2 = 0x10688, /*I2c1 int reg*/
- AMD_P2C_MSG3 = 0x1068C, /*MP2 debug info*/
- AMD_P2C_MSG_INTEN = 0x10690, /*MP2 int gen register*/
- AMD_P2C_MSG_INTSTS = 0x10694, /*Interrupt sts*/
-};
-
-/* Command register data structures */
-
-enum i2c_cmd {
- i2c_read,
- i2c_write,
- i2c_enable,
- i2c_disable,
- number_of_sensor_discovered,
- is_mp2_active,
- invalid_cmd = 0xF,
-};
-
-enum i2c_bus_index {
- i2c_bus_0 = 0,
- i2c_bus_1 = 1,
- i2c_bus_max
-};
-
-enum speed_enum {
- speed100k = 0,
- speed400k = 1,
- speed1000k = 2,
- speed1400k = 3,
- speed3400k = 4
-};
-
-enum mem_type {
- use_dram = 0,
- use_c2pmsg = 1,
-};
-
-union i2c_cmd_base {
- u32 ul;
- struct {
- enum i2c_cmd i2c_cmd : 4; /*!< bit: 0..3 i2c R/W command */
- enum i2c_bus_index bus_id : 4; /*!< bit: 4..7 i2c bus index */
- u32 dev_addr : 8; /*!< bit: 8..15 device address or Bus Speed*/
- u32 length : 12; /*!< bit: 16..29 read/write length */
- enum speed_enum i2c_speed : 3; /*!< bit: 30 register address*/
- enum mem_type mem_type : 1; /*!< bit: 15 mem type*/
- } s; /*!< Structure used for bit access */
-};
-
-/* Response register data structures */
-
-/*Response - Response of SFI*/
-enum response_type {
- invalid_response = 0,
- command_success = 1,
- command_failed = 2,
-};
-
-/*Status - Command ID to indicate a command*/
-enum status_type {
- i2c_readcomplete_event = 0,
- i2c_readfail_event = 1,
- i2c_writecomplete_event = 2,
- i2c_writefail_event = 3,
- i2c_busenable_complete = 4,
- i2c_busenable_failed = 5,
- i2c_busdisable_complete = 6,
- i2c_busdisable_failed = 7,
- invalid_data_length = 8,
- invalid_slave_address = 9,
- invalid_i2cbus_id = 10,
- invalid_dram_addr = 11,
- invalid_command = 12,
- mp2_active = 13,
- numberof_sensors_discovered_resp = 14,
- i2C_bus_notinitialized
-};
-
-union i2c_event_base {
- u32 ul;
- struct {
- enum response_type response : 2; /*!< bit: 0..1 I2C res type */
- enum status_type status : 5; /*!< bit: 2..6 status_type */
- enum mem_type mem_type : 1; /*!< bit: 7 0-DRAM;1- C2PMsg o/p */
- enum i2c_bus_index bus_id : 4; /*!< bit: 8..11 I2C Bus ID */
- u32 length : 12; /*!< bit:16..29 length */
- u32 slave_addr : 8; /*!< bit: 15 debug msg include in p2c msg */
- } r; /*!< Structure used for bit access */
- u32 *buf;
-};
-
-/* data structures for communication with I2c*/
-
-struct i2c_connect_config {
- enum i2c_bus_index bus_id;
- u64 i2c_speed;
- u16 dev_addr;
-};
-
-struct i2c_write_config {
- enum i2c_bus_index bus_id;
- u64 i2c_speed;
- u16 dev_addr;
- u32 length;
- phys_addr_t phy_addr;
- u32 *buf;
-};
-
-struct i2c_read_config {
- enum i2c_bus_index bus_id;
- u64 i2c_speed;
- u16 dev_addr;
- u32 length;
- phys_addr_t phy_addr;
- u8 *buf;
-};
-
-// struct to send/receive data b/w pci and i2c drivers
-struct amd_i2c_pci_ops {
- int (*read_complete)(union i2c_event_base event, void *dev_ctx);
- int (*write_complete)(union i2c_event_base event, void *dev_ctx);
- int (*connect_complete)(union i2c_event_base event, void *dev_ctx);
-};
-
-struct amd_i2c_common {
- struct i2c_connect_config connect_cfg;
- struct i2c_read_config read_cfg;
- struct i2c_write_config write_cfg;
- const struct amd_i2c_pci_ops *ops;
- struct pci_dev *pdev;
-};
-
-struct amd_mp2_dev {
- struct pci_dev *pdev;
- struct dentry *debugfs_dir;
- struct dentry *debugfs_info;
- void __iomem *mmio;
- union i2c_event_base eventval;
- enum i2c_cmd reqcmd;
- struct i2c_connect_config connect_cfg;
- struct i2c_read_config read_cfg;
- struct i2c_write_config write_cfg;
- union i2c_cmd_base i2c_cmd_base;
- const struct amd_i2c_pci_ops *ops;
- struct delayed_work work;
- void *i2c_dev_ctx;
- bool requested;
- raw_spinlock_t lock;
-};
-
-int amd_mp2_read(struct pci_dev *pdev, struct i2c_read_config read_cfg);
-int amd_mp2_write(struct pci_dev *pdev,
- struct i2c_write_config write_cfg);
-int amd_mp2_connect(struct pci_dev *pdev,
- struct i2c_connect_config connect_cfg);
-int amd_i2c_register_cb(struct pci_dev *pdev, const struct amd_i2c_pci_ops *ops,
- void *dev_ctx);
-
-#define ndev_pdev(ndev) ((ndev)->pdev)
-#define ndev_name(ndev) pci_name(ndev_pdev(ndev))
-#define ndev_dev(ndev) (&ndev_pdev(ndev)->dev)
-#define mp2_dev(__work) container_of(__work, struct amd_mp2_dev, work.work)
-
-#endif
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- *
- * This file is provided under a dual BSD/GPLv2 license. When using or
- * redistributing this file, you may do so under either license.
- *
- * GPL LICENSE SUMMARY
- *
- * Copyright (C) 2018 Advanced Micro Devices, Inc. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * BSD LICENSE
- *
- * Copyright (C) 2018 Advanced Micro Devices, Inc. All Rights Reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copy
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of AMD Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
-
- * AMD I2C Platform Driver
- * Author: Nehal Bakulchandra Shah <Nehal-bakulchandra.shah@amd.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/i2c.h>
-#include <linux/platform_device.h>
-#include <linux/acpi.h>
-#include <linux/delay.h>
-#include "i2c-amd-pci-mp2.h"
-#include <linux/dma-mapping.h>
-#define DRIVER_NAME "AMD-I2C-PLATDRV"
-
-struct amd_i2c_dev {
- struct platform_device *pdev;
- struct i2c_adapter adapter;
- struct amd_i2c_common i2c_common;
- struct completion msg_complete;
- struct i2c_msg *msg_buf;
- bool is_configured;
- u8 bus_id;
- u8 *buf;
-
-};
-
-static int i2c_amd_read_completion(union i2c_event_base event, void *dev_ctx)
-{
- struct amd_i2c_dev *i2c_dev = (struct amd_i2c_dev *)dev_ctx;
- struct amd_i2c_common *commond = &i2c_dev->i2c_common;
- int i = 0;
-
- if (event.r.status == i2c_readcomplete_event) {
- if (event.r.length <= 32) {
- pr_devel(" in %s i2c_dev->msg_buf :%p\n",
- __func__, i2c_dev->msg_buf);
-
- memcpy(i2c_dev->msg_buf->buf,
- (unsigned char *)event.buf, event.r.length);
-
- for (i = 0; i < ((event.r.length + 3) / 4); i++)
- pr_devel("%s:%s readdata:%x\n",
- DRIVER_NAME, __func__, event.buf[i]);
-
- } else {
- memcpy(i2c_dev->msg_buf->buf,
- (unsigned char *)commond->read_cfg.buf,
- event.r.length);
- pr_devel("%s:%s virt:%llx phy_addr:%llx\n",
- DRIVER_NAME, __func__,
- (u64)commond->read_cfg.buf,
- (u64)commond->read_cfg.phy_addr);
-
- for (i = 0; i < ((event.r.length + 3) / 4); i++)
- pr_devel("%s:%s readdata:%x\n",
- DRIVER_NAME, __func__, ((unsigned int *)
- commond->read_cfg.buf)[i]);
- }
-
- complete(&i2c_dev->msg_complete);
- }
-
- return 0;
-}
-
-static int i2c_amd_write_completion(union i2c_event_base event, void *dev_ctx)
-{
- struct amd_i2c_dev *i2c_dev = (struct amd_i2c_dev *)dev_ctx;
-
- if (event.r.status == i2c_writecomplete_event)
- complete(&i2c_dev->msg_complete);
-
- return 0;
-}
-
-static int i2c_amd_connect_completion(union i2c_event_base event, void *dev_ctx)
-{
- struct amd_i2c_dev *i2c_dev = (struct amd_i2c_dev *)dev_ctx;
-
- if (event.r.status == i2c_busenable_complete)
- complete(&i2c_dev->msg_complete);
-
- return 0;
-}
-
-static const struct amd_i2c_pci_ops data_handler = {
- .read_complete = i2c_amd_read_completion,
- .write_complete = i2c_amd_write_completion,
- .connect_complete = i2c_amd_connect_completion,
-};
-
-static int i2c_amd_pci_configure(struct amd_i2c_dev *i2c_dev, int slaveaddr)
-{
- struct amd_i2c_common *i2c_common = &i2c_dev->i2c_common;
- int ret;
-
- amd_i2c_register_cb(i2c_common->pdev, &data_handler, (void *)i2c_dev);
- i2c_common->connect_cfg.bus_id = i2c_dev->bus_id;
- i2c_common->connect_cfg.dev_addr = slaveaddr;
- i2c_common->connect_cfg.i2c_speed = speed400k;
-
- ret = amd_mp2_connect(i2c_common->pdev, i2c_common->connect_cfg);
- if (ret)
- return -1;
-
- mdelay(100);
-
- i2c_common->write_cfg.bus_id = i2c_dev->bus_id;
- i2c_common->write_cfg.dev_addr = slaveaddr;
- i2c_common->write_cfg.i2c_speed = speed400k;
-
- i2c_common->read_cfg.bus_id = i2c_dev->bus_id;
- i2c_common->read_cfg.dev_addr = slaveaddr;
- i2c_common->read_cfg.i2c_speed = speed400k;
-
- return 0;
-}
-
-static int i2c_amd_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
-{
- struct amd_i2c_dev *dev = i2c_get_adapdata(adap);
- struct amd_i2c_common *i2c_common = &dev->i2c_common;
-
- int i = 0;
- unsigned long timeout;
- struct i2c_msg *pmsg;
- unsigned char *dma_buf = NULL;
-
- dma_addr_t phys;
-
- reinit_completion(&dev->msg_complete);
- if (dev->is_configured == 0) {
- i2c_amd_pci_configure(dev, msgs->addr);
- timeout = wait_for_completion_timeout(&dev->msg_complete, 50);
- dev->is_configured = 1;
- }
-
- for (i = 0; i < num; i++) {
- pmsg = &msgs[i];
- if (pmsg->flags & I2C_M_RD) {
- if (pmsg->len <= 32) {
- i2c_common->read_cfg.buf = dev->buf;
- i2c_common->read_cfg.length = pmsg->len;
- i2c_common->read_cfg.phy_addr =
- virt_to_phys(dev->buf);
- } else {
- dma_buf = (u8 *)dma_alloc_coherent(&i2c_common->pdev->dev,
- pmsg->len, &phys, GFP_KERNEL);
-
- if (!dma_buf)
- return -ENOMEM;
-
- i2c_common->read_cfg.buf = dma_buf;
- i2c_common->read_cfg.length = pmsg->len;
- i2c_common->read_cfg.phy_addr = phys;
- }
- dev->msg_buf = pmsg;
- amd_mp2_read(i2c_common->pdev,
- i2c_common->read_cfg);
- timeout = wait_for_completion_timeout
- (&dev->msg_complete, 50);
- if (pmsg->len > 32 && dma_buf)
- dma_free_coherent(&i2c_common->pdev->dev,
- pmsg->len, dma_buf, phys);
-
- } else {
- i2c_common->write_cfg.buf = (unsigned int *)pmsg->buf;
- i2c_common->write_cfg.length = pmsg->len;
- amd_mp2_write(i2c_common->pdev,
- i2c_common->write_cfg);
-
- timeout = wait_for_completion_timeout
- (&dev->msg_complete, 50);
- }
- }
- return num;
-}
-
-static u32 i2c_amd_func(struct i2c_adapter *a)
-{
- return I2C_FUNC_I2C;
-}
-
-static const struct i2c_algorithm i2c_amd_algorithm = {
- .master_xfer = i2c_amd_xfer,
- .functionality = i2c_amd_func,
-};
-
-static int i2c_amd_probe(struct platform_device *pdev)
-{
- int ret;
- struct amd_i2c_dev *i2c_dev;
- struct device *dev = &pdev->dev;
- acpi_handle handle = ACPI_HANDLE(&pdev->dev);
- struct acpi_device *adev;
- const char *uid = NULL;
-
- i2c_dev = devm_kzalloc(dev, sizeof(*i2c_dev), GFP_KERNEL);
- if (!i2c_dev)
- return -ENOMEM;
-
- i2c_dev->pdev = pdev;
-
- if (!acpi_bus_get_device(handle, &adev)) {
- pr_err(" i2c0 pdev->id=%s\n", adev->pnp.unique_id);
- uid = adev->pnp.unique_id;
- }
-
- if (strcmp(uid, "0") == 0) {
- pr_err(" bus id is 0\n");
- i2c_dev->bus_id = 0;
- }
-
- pr_devel(" i2c1 pdev->id=%s\n", uid);
- if (strcmp(uid, "1") == 0) {
- pr_err(" bus id is 1\n");
- i2c_dev->bus_id = 1;
- }
- /* setup i2c adapter description */
- i2c_dev->adapter.owner = THIS_MODULE;
- i2c_dev->adapter.algo = &i2c_amd_algorithm;
- i2c_dev->adapter.dev.parent = dev;
- i2c_dev->adapter.algo_data = i2c_dev;
- ACPI_COMPANION_SET(&i2c_dev->adapter.dev, ACPI_COMPANION(&pdev->dev));
- i2c_dev->adapter.dev.of_node = dev->of_node;
- snprintf(i2c_dev->adapter.name, sizeof(i2c_dev->adapter.name), "%s-%s",
- "i2c_dev-i2c", dev_name(pdev->dev.parent));
-
- i2c_dev->i2c_common.pdev = pci_get_device(PCI_VENDOR_ID_AMD,
- PCI_DEVICE_ID_AMD_MP2, NULL);
-
- if (!i2c_dev->i2c_common.pdev) {
- pr_err("%s Could not find pdev in i2c\n", __func__);
- return -EINVAL;
- }
- i2c_dev->buf = kzalloc(32, GFP_KERNEL);
-
- if (!i2c_dev->buf)
- return -ENOMEM;
-
- platform_set_drvdata(pdev, i2c_dev);
-
- i2c_set_adapdata(&i2c_dev->adapter, i2c_dev);
-
- init_completion(&i2c_dev->msg_complete);
- /* and finally attach to i2c layer */
- ret = i2c_add_adapter(&i2c_dev->adapter);
-
- if (ret < 0)
- pr_err(" i2c add adpater failed =%d", ret);
-
- return ret;
-}
-
-static int i2c_amd_remove(struct platform_device *pdev)
-{
- struct amd_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
-
- kfree(i2c_dev->buf);
- i2c_del_adapter(&i2c_dev->adapter);
-
- return 0;
-}
-
-static const struct acpi_device_id i2c_amd_acpi_match[] = {
- { "AMDI0011" },
- { },
-};
-
-static struct platform_driver amd_i2c_plat_driver = {
- .probe = i2c_amd_probe,
- .remove = i2c_amd_remove,
- .driver = {
- .name = "i2c_amd_platdrv",
- .acpi_match_table = ACPI_PTR
- (i2c_amd_acpi_match),
- },
-};
-
-module_platform_driver(amd_i2c_plat_driver);
-
-MODULE_AUTHOR("Nehal Shah <nehal-bakulchandra.shah@amd.com>");
-MODULE_DESCRIPTION("AMD I2C Platform Driver");
-MODULE_LICENSE("Dual BSD/GPL");
-
projects / mirror_ubuntu-bionic-kernel.git / commitdiff