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// SPDX-License-Identifier: GPL-2.0-only
/*
* AMD Secure Processor device driver
*
* Copyright (C) 2013,2018 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
* Author: Gary R Hook <gary.hook@amd.com>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/dma-mapping.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/ccp.h>
#include "ccp-dev.h"
#include "psp-dev.h"
#define MSIX_VECTORS 2
struct sp_pci {
int msix_count;
struct msix_entry msix_entry[MSIX_VECTORS];
};
static struct sp_device *sp_dev_master;
static int sp_get_msix_irqs(struct sp_device *sp)
{
struct sp_pci *sp_pci = sp->dev_specific;
struct device *dev = sp->dev;
struct pci_dev *pdev = to_pci_dev(dev);
int v, ret;
for (v = 0; v < ARRAY_SIZE(sp_pci->msix_entry); v++)
sp_pci->msix_entry[v].entry = v;
ret = pci_enable_msix_range(pdev, sp_pci->msix_entry, 1, v);
if (ret < 0)
return ret;
sp_pci->msix_count = ret;
sp->use_tasklet = true;
sp->psp_irq = sp_pci->msix_entry[0].vector;
sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector
: sp_pci->msix_entry[0].vector;
return 0;
}
static int sp_get_msi_irq(struct sp_device *sp)
{
struct device *dev = sp->dev;
struct pci_dev *pdev = to_pci_dev(dev);
int ret;
ret = pci_enable_msi(pdev);
if (ret)
return ret;
sp->ccp_irq = pdev->irq;
sp->psp_irq = pdev->irq;
return 0;
}
static int sp_get_irqs(struct sp_device *sp)
{
struct device *dev = sp->dev;
int ret;
ret = sp_get_msix_irqs(sp);
if (!ret)
return 0;
/* Couldn't get MSI-X vectors, try MSI */
dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
ret = sp_get_msi_irq(sp);
if (!ret)
return 0;
/* Couldn't get MSI interrupt */
dev_notice(dev, "could not enable MSI (%d)\n", ret);
return ret;
}
static void sp_free_irqs(struct sp_device *sp)
{
struct sp_pci *sp_pci = sp->dev_specific;
struct device *dev = sp->dev;
struct pci_dev *pdev = to_pci_dev(dev);
if (sp_pci->msix_count)
pci_disable_msix(pdev);
else if (sp->psp_irq)
pci_disable_msi(pdev);
sp->ccp_irq = 0;
sp->psp_irq = 0;
}
static bool sp_pci_is_master(struct sp_device *sp)
{
struct device *dev_cur, *dev_new;
struct pci_dev *pdev_cur, *pdev_new;
dev_new = sp->dev;
dev_cur = sp_dev_master->dev;
pdev_new = to_pci_dev(dev_new);
pdev_cur = to_pci_dev(dev_cur);
if (pdev_new->bus->number < pdev_cur->bus->number)
return true;
if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn))
return true;
if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn))
return true;
return false;
}
static void psp_set_master(struct sp_device *sp)
{
if (!sp_dev_master) {
sp_dev_master = sp;
return;
}
if (sp_pci_is_master(sp))
sp_dev_master = sp;
}
static struct sp_device *psp_get_master(void)
{
return sp_dev_master;
}
static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct sp_device *sp;
struct sp_pci *sp_pci;
struct device *dev = &pdev->dev;
void __iomem * const *iomap_table;
int bar_mask;
int ret;
ret = -ENOMEM;
sp = sp_alloc_struct(dev);
if (!sp)
goto e_err;
sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL);
if (!sp_pci)
goto e_err;
sp->dev_specific = sp_pci;
sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data;
if (!sp->dev_vdata) {
ret = -ENODEV;
dev_err(dev, "missing driver data\n");
goto e_err;
}
ret = pcim_enable_device(pdev);
if (ret) {
dev_err(dev, "pcim_enable_device failed (%d)\n", ret);
goto e_err;
}
bar_mask = pci_select_bars(pdev, IORESOURCE_MEM);
ret = pcim_iomap_regions(pdev, bar_mask, "ccp");
if (ret) {
dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret);
goto e_err;
}
iomap_table = pcim_iomap_table(pdev);
if (!iomap_table) {
dev_err(dev, "pcim_iomap_table failed\n");
ret = -ENOMEM;
goto e_err;
}
sp->io_map = iomap_table[sp->dev_vdata->bar];
if (!sp->io_map) {
dev_err(dev, "ioremap failed\n");
ret = -ENOMEM;
goto e_err;
}
ret = sp_get_irqs(sp);
if (ret)
goto e_err;
pci_set_master(pdev);
sp->set_psp_master_device = psp_set_master;
sp->get_psp_master_device = psp_get_master;
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48));
if (ret) {
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
if (ret) {
dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n",
ret);
goto e_err;
}
}
dev_set_drvdata(dev, sp);
ret = sp_init(sp);
if (ret)
goto e_err;
return 0;
e_err:
dev_notice(dev, "initialization failed\n");
return ret;
}
static void sp_pci_remove(struct pci_dev *pdev)
{
struct device *dev = &pdev->dev;
struct sp_device *sp = dev_get_drvdata(dev);
if (!sp)
return;
sp_destroy(sp);
sp_free_irqs(sp);
}
#ifdef CONFIG_PM
static int sp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
{
struct device *dev = &pdev->dev;
struct sp_device *sp = dev_get_drvdata(dev);
return sp_suspend(sp, state);
}
static int sp_pci_resume(struct pci_dev *pdev)
{
struct device *dev = &pdev->dev;
struct sp_device *sp = dev_get_drvdata(dev);
return sp_resume(sp);
}
#endif
#ifdef CONFIG_CRYPTO_DEV_SP_PSP
static const struct psp_vdata pspv1 = {
.cmdresp_reg = 0x10580,
.cmdbuff_addr_lo_reg = 0x105e0,
.cmdbuff_addr_hi_reg = 0x105e4,
.feature_reg = 0x105fc,
.inten_reg = 0x10610,
.intsts_reg = 0x10614,
};
static const struct psp_vdata pspv2 = {
.cmdresp_reg = 0x10980,
.cmdbuff_addr_lo_reg = 0x109e0,
.cmdbuff_addr_hi_reg = 0x109e4,
.feature_reg = 0x109fc,
.inten_reg = 0x10690,
.intsts_reg = 0x10694,
};
#endif
static const struct sp_dev_vdata dev_vdata[] = {
{ /* 0 */
.bar = 2,
#ifdef CONFIG_CRYPTO_DEV_SP_CCP
.ccp_vdata = &ccpv3,
#endif
},
{ /* 1 */
.bar = 2,
#ifdef CONFIG_CRYPTO_DEV_SP_CCP
.ccp_vdata = &ccpv5a,
#endif
#ifdef CONFIG_CRYPTO_DEV_SP_PSP
.psp_vdata = &pspv1,
#endif
},
{ /* 2 */
.bar = 2,
#ifdef CONFIG_CRYPTO_DEV_SP_CCP
.ccp_vdata = &ccpv5b,
#endif
},
{ /* 3 */
.bar = 2,
#ifdef CONFIG_CRYPTO_DEV_SP_CCP
.ccp_vdata = &ccpv5a,
#endif
#ifdef CONFIG_CRYPTO_DEV_SP_PSP
.psp_vdata = &pspv2,
#endif
},
};
static const struct pci_device_id sp_pci_table[] = {
{ PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] },
{ PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] },
{ PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] },
{ PCI_VDEVICE(AMD, 0x1486), (kernel_ulong_t)&dev_vdata[3] },
/* Last entry must be zero */
{ 0, }
};
MODULE_DEVICE_TABLE(pci, sp_pci_table);
static struct pci_driver sp_pci_driver = {
.name = "ccp",
.id_table = sp_pci_table,
.probe = sp_pci_probe,
.remove = sp_pci_remove,
#ifdef CONFIG_PM
.suspend = sp_pci_suspend,
.resume = sp_pci_resume,
#endif
};
int sp_pci_init(void)
{
return pci_register_driver(&sp_pci_driver);
}
void sp_pci_exit(void)
{
pci_unregister_driver(&sp_pci_driver);
}
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