+++ /dev/null
-/*
- * IOSF-SB MailBox Interface Driver
- * Copyright (c) 2013, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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.
- *
- *
- * The IOSF-SB is a fabric bus available on Atom based SOC's that uses a
- * mailbox interface (MBI) to communicate with mutiple devices. This
- * driver implements access to this interface for those platforms that can
- * enumerate the device using PCI.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/pci.h>
-#include <linux/debugfs.h>
-#include <linux/capability.h>
-
-#include <asm/iosf_mbi.h>
-
-#define PCI_DEVICE_ID_BAYTRAIL 0x0F00
-#define PCI_DEVICE_ID_BRASWELL 0x2280
-#define PCI_DEVICE_ID_QUARK_X1000 0x0958
-
-static DEFINE_SPINLOCK(iosf_mbi_lock);
-
-static inline u32 iosf_mbi_form_mcr(u8 op, u8 port, u8 offset)
-{
- return (op << 24) | (port << 16) | (offset << 8) | MBI_ENABLE;
-}
-
-static struct pci_dev *mbi_pdev; /* one mbi device */
-
-static int iosf_mbi_pci_read_mdr(u32 mcrx, u32 mcr, u32 *mdr)
-{
- int result;
-
- if (!mbi_pdev)
- return -ENODEV;
-
- if (mcrx) {
- result = pci_write_config_dword(mbi_pdev, MBI_MCRX_OFFSET,
- mcrx);
- if (result < 0)
- goto fail_read;
- }
-
- result = pci_write_config_dword(mbi_pdev, MBI_MCR_OFFSET, mcr);
- if (result < 0)
- goto fail_read;
-
- result = pci_read_config_dword(mbi_pdev, MBI_MDR_OFFSET, mdr);
- if (result < 0)
- goto fail_read;
-
- return 0;
-
-fail_read:
- dev_err(&mbi_pdev->dev, "PCI config access failed with %d\n", result);
- return result;
-}
-
-static int iosf_mbi_pci_write_mdr(u32 mcrx, u32 mcr, u32 mdr)
-{
- int result;
-
- if (!mbi_pdev)
- return -ENODEV;
-
- result = pci_write_config_dword(mbi_pdev, MBI_MDR_OFFSET, mdr);
- if (result < 0)
- goto fail_write;
-
- if (mcrx) {
- result = pci_write_config_dword(mbi_pdev, MBI_MCRX_OFFSET,
- mcrx);
- if (result < 0)
- goto fail_write;
- }
-
- result = pci_write_config_dword(mbi_pdev, MBI_MCR_OFFSET, mcr);
- if (result < 0)
- goto fail_write;
-
- return 0;
-
-fail_write:
- dev_err(&mbi_pdev->dev, "PCI config access failed with %d\n", result);
- return result;
-}
-
-int iosf_mbi_read(u8 port, u8 opcode, u32 offset, u32 *mdr)
-{
- u32 mcr, mcrx;
- unsigned long flags;
- int ret;
-
- /*Access to the GFX unit is handled by GPU code */
- if (port == BT_MBI_UNIT_GFX) {
- WARN_ON(1);
- return -EPERM;
- }
-
- mcr = iosf_mbi_form_mcr(opcode, port, offset & MBI_MASK_LO);
- mcrx = offset & MBI_MASK_HI;
-
- spin_lock_irqsave(&iosf_mbi_lock, flags);
- ret = iosf_mbi_pci_read_mdr(mcrx, mcr, mdr);
- spin_unlock_irqrestore(&iosf_mbi_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL(iosf_mbi_read);
-
-int iosf_mbi_write(u8 port, u8 opcode, u32 offset, u32 mdr)
-{
- u32 mcr, mcrx;
- unsigned long flags;
- int ret;
-
- /*Access to the GFX unit is handled by GPU code */
- if (port == BT_MBI_UNIT_GFX) {
- WARN_ON(1);
- return -EPERM;
- }
-
- mcr = iosf_mbi_form_mcr(opcode, port, offset & MBI_MASK_LO);
- mcrx = offset & MBI_MASK_HI;
-
- spin_lock_irqsave(&iosf_mbi_lock, flags);
- ret = iosf_mbi_pci_write_mdr(mcrx, mcr, mdr);
- spin_unlock_irqrestore(&iosf_mbi_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL(iosf_mbi_write);
-
-int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask)
-{
- u32 mcr, mcrx;
- u32 value;
- unsigned long flags;
- int ret;
-
- /*Access to the GFX unit is handled by GPU code */
- if (port == BT_MBI_UNIT_GFX) {
- WARN_ON(1);
- return -EPERM;
- }
-
- mcr = iosf_mbi_form_mcr(opcode, port, offset & MBI_MASK_LO);
- mcrx = offset & MBI_MASK_HI;
-
- spin_lock_irqsave(&iosf_mbi_lock, flags);
-
- /* Read current mdr value */
- ret = iosf_mbi_pci_read_mdr(mcrx, mcr & MBI_RD_MASK, &value);
- if (ret < 0) {
- spin_unlock_irqrestore(&iosf_mbi_lock, flags);
- return ret;
- }
-
- /* Apply mask */
- value &= ~mask;
- mdr &= mask;
- value |= mdr;
-
- /* Write back */
- ret = iosf_mbi_pci_write_mdr(mcrx, mcr | MBI_WR_MASK, value);
-
- spin_unlock_irqrestore(&iosf_mbi_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL(iosf_mbi_modify);
-
-bool iosf_mbi_available(void)
-{
- /* Mbi isn't hot-pluggable. No remove routine is provided */
- return mbi_pdev;
-}
-EXPORT_SYMBOL(iosf_mbi_available);
-
-#ifdef CONFIG_IOSF_MBI_DEBUG
-static u32 dbg_mdr;
-static u32 dbg_mcr;
-static u32 dbg_mcrx;
-
-static int mcr_get(void *data, u64 *val)
-{
- *val = *(u32 *)data;
- return 0;
-}
-
-static int mcr_set(void *data, u64 val)
-{
- u8 command = ((u32)val & 0xFF000000) >> 24,
- port = ((u32)val & 0x00FF0000) >> 16,
- offset = ((u32)val & 0x0000FF00) >> 8;
- int err;
-
- *(u32 *)data = val;
-
- if (!capable(CAP_SYS_RAWIO))
- return -EACCES;
-
- if (command & 1u)
- err = iosf_mbi_write(port,
- command,
- dbg_mcrx | offset,
- dbg_mdr);
- else
- err = iosf_mbi_read(port,
- command,
- dbg_mcrx | offset,
- &dbg_mdr);
-
- return err;
-}
-DEFINE_SIMPLE_ATTRIBUTE(iosf_mcr_fops, mcr_get, mcr_set , "%llx\n");
-
-static struct dentry *iosf_dbg;
-
-static void iosf_sideband_debug_init(void)
-{
- struct dentry *d;
-
- iosf_dbg = debugfs_create_dir("iosf_sb", NULL);
- if (IS_ERR_OR_NULL(iosf_dbg))
- return;
-
- /* mdr */
- d = debugfs_create_x32("mdr", 0660, iosf_dbg, &dbg_mdr);
- if (IS_ERR_OR_NULL(d))
- goto cleanup;
-
- /* mcrx */
- debugfs_create_x32("mcrx", 0660, iosf_dbg, &dbg_mcrx);
- if (IS_ERR_OR_NULL(d))
- goto cleanup;
-
- /* mcr - initiates mailbox tranaction */
- debugfs_create_file("mcr", 0660, iosf_dbg, &dbg_mcr, &iosf_mcr_fops);
- if (IS_ERR_OR_NULL(d))
- goto cleanup;
-
- return;
-
-cleanup:
- debugfs_remove_recursive(d);
-}
-
-static void iosf_debugfs_init(void)
-{
- iosf_sideband_debug_init();
-}
-
-static void iosf_debugfs_remove(void)
-{
- debugfs_remove_recursive(iosf_dbg);
-}
-#else
-static inline void iosf_debugfs_init(void) { }
-static inline void iosf_debugfs_remove(void) { }
-#endif /* CONFIG_IOSF_MBI_DEBUG */
-
-static int iosf_mbi_probe(struct pci_dev *pdev,
- const struct pci_device_id *unused)
-{
- int ret;
-
- ret = pci_enable_device(pdev);
- if (ret < 0) {
- dev_err(&pdev->dev, "error: could not enable device\n");
- return ret;
- }
-
- mbi_pdev = pci_dev_get(pdev);
- return 0;
-}
-
-static const struct pci_device_id iosf_mbi_pci_ids[] = {
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_BAYTRAIL) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_BRASWELL) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_QUARK_X1000) },
- { 0, },
-};
-MODULE_DEVICE_TABLE(pci, iosf_mbi_pci_ids);
-
-static struct pci_driver iosf_mbi_pci_driver = {
- .name = "iosf_mbi_pci",
- .probe = iosf_mbi_probe,
- .id_table = iosf_mbi_pci_ids,
-};
-
-static int __init iosf_mbi_init(void)
-{
- iosf_debugfs_init();
-
- return pci_register_driver(&iosf_mbi_pci_driver);
-}
-
-static void __exit iosf_mbi_exit(void)
-{
- iosf_debugfs_remove();
-
- pci_unregister_driver(&iosf_mbi_pci_driver);
- if (mbi_pdev) {
- pci_dev_put(mbi_pdev);
- mbi_pdev = NULL;
- }
-}
-
-module_init(iosf_mbi_init);
-module_exit(iosf_mbi_exit);
-
-MODULE_AUTHOR("David E. Box <david.e.box@linux.intel.com>");
-MODULE_DESCRIPTION("IOSF Mailbox Interface accessor");
-MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff