1 files changed, 0 insertions, 444 deletions
diff --git a/drivers/misc/aspeed-p2a-ctrl.c b/drivers/misc/aspeed-p2a-ctrl.c
deleted file mode 100644
index b60fbeaffcbd..000000000000
--- a/drivers/misc/aspeed-p2a-ctrl.c
+++ /dev/null
@@ -1,444 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright 2019 Google Inc
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Provides a simple driver to control the ASPEED P2A interface which allows
- * the host to read and write to various regions of the BMC's memory.
- */
-
-#include <linux/fs.h>
-#include <linux/io.h>
-#include <linux/mfd/syscon.h>
-#include <linux/miscdevice.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/of_address.h>
-#include <linux/of_device.h>
-#include <linux/platform_device.h>
-#include <linux/regmap.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-
-#include <linux/aspeed-p2a-ctrl.h>
-
-#define DEVICE_NAME	"aspeed-p2a-ctrl"
-
-/* SCU2C is a Misc. Control Register. */
-#define SCU2C 0x2c
-/* SCU180 is the PCIe Configuration Setting Control Register. */
-#define SCU180 0x180
-/* Bit 1 controls the P2A bridge, while bit 0 controls the entire VGA device
- * on the PCI bus.
- */
-#define SCU180_ENP2A BIT(1)
-
-/* The ast2400/2500 both have six ranges. */
-#define P2A_REGION_COUNT 6
-
-struct region {
-	u64 min;
-	u64 max;
-	u32 bit;
-};
-
-struct aspeed_p2a_model_data {
-	/* min, max, bit */
-	struct region regions[P2A_REGION_COUNT];
-};
-
-struct aspeed_p2a_ctrl {
-	struct miscdevice miscdev;
-	struct regmap *regmap;
-
-	const struct aspeed_p2a_model_data *config;
-
-	/* Access to these needs to be locked, held via probe, mapping ioctl,
-	 * and release, remove.
-	 */
-	struct mutex tracking;
-	u32 readers;
-	u32 readerwriters[P2A_REGION_COUNT];
-
-	phys_addr_t mem_base;
-	resource_size_t mem_size;
-};
-
-struct aspeed_p2a_user {
-	struct file *file;
-	struct aspeed_p2a_ctrl *parent;
-
-	/* The entire memory space is opened for reading once the bridge is
-	 * enabled, therefore this needs only to be tracked once per user.
-	 * If any user has it open for read, the bridge must stay enabled.
-	 */
-	u32 read;
-
-	/* Each entry of the array corresponds to a P2A Region.  If the user
-	 * opens for read or readwrite, the reference goes up here.  On
-	 * release, this array is walked and references adjusted accordingly.
-	 */
-	u32 readwrite[P2A_REGION_COUNT];
-};
-
-static void aspeed_p2a_enable_bridge(struct aspeed_p2a_ctrl *p2a_ctrl)
-{
-	regmap_update_bits(p2a_ctrl->regmap,
-		SCU180, SCU180_ENP2A, SCU180_ENP2A);
-}
-
-static void aspeed_p2a_disable_bridge(struct aspeed_p2a_ctrl *p2a_ctrl)
-{
-	regmap_update_bits(p2a_ctrl->regmap, SCU180, SCU180_ENP2A, 0);
-}
-
-static int aspeed_p2a_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	unsigned long vsize;
-	pgprot_t prot;
-	struct aspeed_p2a_user *priv = file->private_data;
-	struct aspeed_p2a_ctrl *ctrl = priv->parent;
-
-	if (ctrl->mem_base == 0 && ctrl->mem_size == 0)
-		return -EINVAL;
-
-	vsize = vma->vm_end - vma->vm_start;
-	prot = vma->vm_page_prot;
-
-	if (vma->vm_pgoff + vsize > ctrl->mem_base + ctrl->mem_size)
-		return -EINVAL;
-
-	/* ast2400/2500 AHB accesses are not cache coherent */
-	prot = pgprot_noncached(prot);
-
-	if (remap_pfn_range(vma, vma->vm_start,
-		(ctrl->mem_base >> PAGE_SHIFT) + vma->vm_pgoff,
-		vsize, prot))
-		return -EAGAIN;
-
-	return 0;
-}
-
-static bool aspeed_p2a_region_acquire(struct aspeed_p2a_user *priv,
-		struct aspeed_p2a_ctrl *ctrl,
-		struct aspeed_p2a_ctrl_mapping *map)
-{
-	int i;
-	u64 base, end;
-	bool matched = false;
-
-	base = map->addr;
-	end = map->addr + (map->length - 1);
-
-	/* If the value is a legal u32, it will find a match. */
-	for (i = 0; i < P2A_REGION_COUNT; i++) {
-		const struct region *curr = &ctrl->config->regions[i];
-
-		/* If the top of this region is lower than your base, skip it.
-		 */
-		if (curr->max < base)
-			continue;
-
-		/* If the bottom of this region is higher than your end, bail.
-		 */
-		if (curr->min > end)
-			break;
-
-		/* Lock this and update it, therefore it someone else is
-		 * closing their file out, this'll preserve the increment.
-		 */
-		mutex_lock(&ctrl->tracking);
-		ctrl->readerwriters[i] += 1;
-		mutex_unlock(&ctrl->tracking);
-
-		/* Track with the user, so when they close their file, we can
-		 * decrement properly.
-		 */
-		priv->readwrite[i] += 1;
-
-		/* Enable the region as read-write. */
-		regmap_update_bits(ctrl->regmap, SCU2C, curr->bit, 0);
-		matched = true;
-	}
-
-	return matched;
-}
-
-static long aspeed_p2a_ioctl(struct file *file, unsigned int cmd,
-		unsigned long data)
-{
-	struct aspeed_p2a_user *priv = file->private_data;
-	struct aspeed_p2a_ctrl *ctrl = priv->parent;
-	void __user *arg = (void __user *)data;
-	struct aspeed_p2a_ctrl_mapping map;
-
-	if (copy_from_user(&map, arg, sizeof(map)))
-		return -EFAULT;
-
-	switch (cmd) {
-	case ASPEED_P2A_CTRL_IOCTL_SET_WINDOW:
-		/* If they want a region to be read-only, since the entire
-		 * region is read-only once enabled, we just need to track this
-		 * user wants to read from the bridge, and if it's not enabled.
-		 * Enable it.
-		 */
-		if (map.flags == ASPEED_P2A_CTRL_READ_ONLY) {
-			mutex_lock(&ctrl->tracking);
-			ctrl->readers += 1;
-			mutex_unlock(&ctrl->tracking);
-
-			/* Track with the user, so when they close their file,
-			 * we can decrement properly.
-			 */
-			priv->read += 1;
-		} else if (map.flags == ASPEED_P2A_CTRL_READWRITE) {
-			/* If we don't acquire any region return error. */
-			if (!aspeed_p2a_region_acquire(priv, ctrl, &map)) {
-				return -EINVAL;
-			}
-		} else {
-			/* Invalid map flags. */
-			return -EINVAL;
-		}
-
-		aspeed_p2a_enable_bridge(ctrl);
-		return 0;
-	case ASPEED_P2A_CTRL_IOCTL_GET_MEMORY_CONFIG:
-		/* This is a request for the memory-region and corresponding
-		 * length that is used by the driver for mmap.
-		 */
-
-		map.flags = 0;
-		map.addr = ctrl->mem_base;
-		map.length = ctrl->mem_size;
-
-		return copy_to_user(arg, &map, sizeof(map)) ? -EFAULT : 0;
-	}
-
-	return -EINVAL;
-}
-
-
-/*
- * When a user opens this file, we create a structure to track their mappings.
- *
- * A user can map a region as read-only (bridge enabled), or read-write (bit
- * flipped, and bridge enabled).  Either way, this tracking is used, s.t. when
- * they release the device references are handled.
- *
- * The bridge is not enabled until a user calls an ioctl to map a region,
- * simply opening the device does not enable it.
- */
-static int aspeed_p2a_open(struct inode *inode, struct file *file)
-{
-	struct aspeed_p2a_user *priv;
-
-	priv = kmalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	priv->file = file;
-	priv->read = 0;
-	memset(priv->readwrite, 0, sizeof(priv->readwrite));
-
-	/* The file's private_data is initialized to the p2a_ctrl. */
-	priv->parent = file->private_data;
-
-	/* Set the file's private_data to the user's data. */
-	file->private_data = priv;
-
-	return 0;
-}
-
-/*
- * This will close the users mappings.  It will go through what they had opened
- * for readwrite, and decrement those counts.  If at the end, this is the last
- * user, it'll close the bridge.
- */
-static int aspeed_p2a_release(struct inode *inode, struct file *file)
-{
-	int i;
-	u32 bits = 0;
-	bool open_regions = false;
-	struct aspeed_p2a_user *priv = file->private_data;
-
-	/* Lock others from changing these values until everything is updated
-	 * in one pass.
-	 */
-	mutex_lock(&priv->parent->tracking);
-
-	priv->parent->readers -= priv->read;
-
-	for (i = 0; i < P2A_REGION_COUNT; i++) {
-		priv->parent->readerwriters[i] -= priv->readwrite[i];
-
-		if (priv->parent->readerwriters[i] > 0)
-			open_regions = true;
-		else
-			bits |= priv->parent->config->regions[i].bit;
-	}
-
-	/* Setting a bit to 1 disables the region, so let's just OR with the
-	 * above to disable any.
-	 */
-
-	/* Note, if another user is trying to ioctl, they can't grab tracking,
-	 * and therefore can't grab either register mutex.
-	 * If another user is trying to close, they can't grab tracking either.
-	 */
-	regmap_update_bits(priv->parent->regmap, SCU2C, bits, bits);
-
-	/* If parent->readers is zero and open windows is 0, disable the
-	 * bridge.
-	 */
-	if (!open_regions && priv->parent->readers == 0)
-		aspeed_p2a_disable_bridge(priv->parent);
-
-	mutex_unlock(&priv->parent->tracking);
-
-	kfree(priv);
-
-	return 0;
-}
-
-static const struct file_operations aspeed_p2a_ctrl_fops = {
-	.owner = THIS_MODULE,
-	.mmap = aspeed_p2a_mmap,
-	.unlocked_ioctl = aspeed_p2a_ioctl,
-	.open = aspeed_p2a_open,
-	.release = aspeed_p2a_release,
-};
-
-/* The regions are controlled by SCU2C */
-static void aspeed_p2a_disable_all(struct aspeed_p2a_ctrl *p2a_ctrl)
-{
-	int i;
-	u32 value = 0;
-
-	for (i = 0; i < P2A_REGION_COUNT; i++)
-		value |= p2a_ctrl->config->regions[i].bit;
-
-	regmap_update_bits(p2a_ctrl->regmap, SCU2C, value, value);
-
-	/* Disable the bridge. */
-	aspeed_p2a_disable_bridge(p2a_ctrl);
-}
-
-static int aspeed_p2a_ctrl_probe(struct platform_device *pdev)
-{
-	struct aspeed_p2a_ctrl *misc_ctrl;
-	struct device *dev;
-	struct resource resm;
-	struct device_node *node;
-	int rc = 0;
-
-	dev = &pdev->dev;
-
-	misc_ctrl = devm_kzalloc(dev, sizeof(*misc_ctrl), GFP_KERNEL);
-	if (!misc_ctrl)
-		return -ENOMEM;
-
-	mutex_init(&misc_ctrl->tracking);
-
-	/* optional. */
-	node = of_parse_phandle(dev->of_node, "memory-region", 0);
-	if (node) {
-		rc = of_address_to_resource(node, 0, &resm);
-		of_node_put(node);
-		if (rc) {
-			dev_err(dev, "Couldn't address to resource for reserved memory\n");
-			return -ENODEV;
-		}
-
-		misc_ctrl->mem_size = resource_size(&resm);
-		misc_ctrl->mem_base = resm.start;
-	}
-
-	misc_ctrl->regmap = syscon_node_to_regmap(pdev->dev.parent->of_node);
-	if (IS_ERR(misc_ctrl->regmap)) {
-		dev_err(dev, "Couldn't get regmap\n");
-		return -ENODEV;
-	}
-
-	misc_ctrl->config = of_device_get_match_data(dev);
-
-	dev_set_drvdata(&pdev->dev, misc_ctrl);
-
-	aspeed_p2a_disable_all(misc_ctrl);
-
-	misc_ctrl->miscdev.minor = MISC_DYNAMIC_MINOR;
-	misc_ctrl->miscdev.name = DEVICE_NAME;
-	misc_ctrl->miscdev.fops = &aspeed_p2a_ctrl_fops;
-	misc_ctrl->miscdev.parent = dev;
-
-	rc = misc_register(&misc_ctrl->miscdev);
-	if (rc)
-		dev_err(dev, "Unable to register device\n");
-
-	return rc;
-}
-
-static int aspeed_p2a_ctrl_remove(struct platform_device *pdev)
-{
-	struct aspeed_p2a_ctrl *p2a_ctrl = dev_get_drvdata(&pdev->dev);
-
-	misc_deregister(&p2a_ctrl->miscdev);
-
-	return 0;
-}
-
-#define SCU2C_DRAM	BIT(25)
-#define SCU2C_SPI	BIT(24)
-#define SCU2C_SOC	BIT(23)
-#define SCU2C_FLASH	BIT(22)
-
-static const struct aspeed_p2a_model_data ast2400_model_data = {
-	.regions = {
-		{0x00000000, 0x17FFFFFF, SCU2C_FLASH},
-		{0x18000000, 0x1FFFFFFF, SCU2C_SOC},
-		{0x20000000, 0x2FFFFFFF, SCU2C_FLASH},
-		{0x30000000, 0x3FFFFFFF, SCU2C_SPI},
-		{0x40000000, 0x5FFFFFFF, SCU2C_DRAM},
-		{0x60000000, 0xFFFFFFFF, SCU2C_SOC},
-	}
-};
-
-static const struct aspeed_p2a_model_data ast2500_model_data = {
-	.regions = {
-		{0x00000000, 0x0FFFFFFF, SCU2C_FLASH},
-		{0x10000000, 0x1FFFFFFF, SCU2C_SOC},
-		{0x20000000, 0x3FFFFFFF, SCU2C_FLASH},
-		{0x40000000, 0x5FFFFFFF, SCU2C_SOC},
-		{0x60000000, 0x7FFFFFFF, SCU2C_SPI},
-		{0x80000000, 0xFFFFFFFF, SCU2C_DRAM},
-	}
-};
-
-static const struct of_device_id aspeed_p2a_ctrl_match[] = {
-	{ .compatible = "aspeed,ast2400-p2a-ctrl",
-	  .data = &ast2400_model_data },
-	{ .compatible = "aspeed,ast2500-p2a-ctrl",
-	  .data = &ast2500_model_data },
-	{ },
-};
-
-static struct platform_driver aspeed_p2a_ctrl_driver = {
-	.driver = {
-		.name		= DEVICE_NAME,
-		.of_match_table = aspeed_p2a_ctrl_match,
-	},
-	.probe = aspeed_p2a_ctrl_probe,
-	.remove = aspeed_p2a_ctrl_remove,
-};
-
-module_platform_driver(aspeed_p2a_ctrl_driver);
-
-MODULE_DEVICE_TABLE(of, aspeed_p2a_ctrl_match);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Patrick Venture <venture@google.com>");
-MODULE_DESCRIPTION("Control for aspeed 2400/2500 P2A VGA HOST to BMC mappings");