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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2016-2019 HabanaLabs, Ltd.
* All Rights Reserved.
*/
#include "habanalabs.h"
#include "../include/hw_ip/pci/pci_general.h"
#include <linux/pci.h>
#define HL_PLDM_PCI_ELBI_TIMEOUT_MSEC (HL_PCI_ELBI_TIMEOUT_MSEC * 10)
#define IATU_REGION_CTRL_REGION_EN_MASK BIT(31)
#define IATU_REGION_CTRL_MATCH_MODE_MASK BIT(30)
#define IATU_REGION_CTRL_NUM_MATCH_EN_MASK BIT(19)
#define IATU_REGION_CTRL_BAR_NUM_MASK GENMASK(10, 8)
/**
* hl_pci_bars_map() - Map PCI BARs.
* @hdev: Pointer to hl_device structure.
* @name: Array of BAR names.
* @is_wc: Array with flag per BAR whether a write-combined mapping is needed.
*
* Request PCI regions and map them to kernel virtual addresses.
*
* Return: 0 on success, non-zero for failure.
*/
int hl_pci_bars_map(struct hl_device *hdev, const char * const name[3],
bool is_wc[3])
{
struct pci_dev *pdev = hdev->pdev;
int rc, i, bar;
rc = pci_request_regions(pdev, HL_NAME);
if (rc) {
dev_err(hdev->dev, "Cannot obtain PCI resources\n");
return rc;
}
for (i = 0 ; i < 3 ; i++) {
bar = i * 2; /* 64-bit BARs */
hdev->pcie_bar[bar] = is_wc[i] ?
pci_ioremap_wc_bar(pdev, bar) :
pci_ioremap_bar(pdev, bar);
if (!hdev->pcie_bar[bar]) {
dev_err(hdev->dev, "pci_ioremap%s_bar failed for %s\n",
is_wc[i] ? "_wc" : "", name[i]);
rc = -ENODEV;
goto err;
}
}
return 0;
err:
for (i = 2 ; i >= 0 ; i--) {
bar = i * 2; /* 64-bit BARs */
if (hdev->pcie_bar[bar])
iounmap(hdev->pcie_bar[bar]);
}
pci_release_regions(pdev);
return rc;
}
/**
* hl_pci_bars_unmap() - Unmap PCI BARS.
* @hdev: Pointer to hl_device structure.
*
* Release all PCI BARs and unmap their virtual addresses.
*/
static void hl_pci_bars_unmap(struct hl_device *hdev)
{
struct pci_dev *pdev = hdev->pdev;
int i, bar;
for (i = 2 ; i >= 0 ; i--) {
bar = i * 2; /* 64-bit BARs */
iounmap(hdev->pcie_bar[bar]);
}
pci_release_regions(pdev);
}
/**
* hl_pci_elbi_write() - Write through the ELBI interface.
* @hdev: Pointer to hl_device structure.
* @addr: Address to write to
* @data: Data to write
*
* Return: 0 on success, negative value for failure.
*/
static int hl_pci_elbi_write(struct hl_device *hdev, u64 addr, u32 data)
{
struct pci_dev *pdev = hdev->pdev;
ktime_t timeout;
u64 msec;
u32 val;
if (hdev->pldm)
msec = HL_PLDM_PCI_ELBI_TIMEOUT_MSEC;
else
msec = HL_PCI_ELBI_TIMEOUT_MSEC;
/* Clear previous status */
pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_STS, 0);
pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_ADDR, (u32) addr);
pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_DATA, data);
pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_CTRL,
PCI_CONFIG_ELBI_CTRL_WRITE);
timeout = ktime_add_ms(ktime_get(), msec);
for (;;) {
pci_read_config_dword(pdev, mmPCI_CONFIG_ELBI_STS, &val);
if (val & PCI_CONFIG_ELBI_STS_MASK)
break;
if (ktime_compare(ktime_get(), timeout) > 0) {
pci_read_config_dword(pdev, mmPCI_CONFIG_ELBI_STS,
&val);
break;
}
usleep_range(300, 500);
}
if ((val & PCI_CONFIG_ELBI_STS_MASK) == PCI_CONFIG_ELBI_STS_DONE)
return 0;
if (val & PCI_CONFIG_ELBI_STS_ERR)
return -EIO;
if (!(val & PCI_CONFIG_ELBI_STS_MASK)) {
dev_err(hdev->dev, "ELBI write didn't finish in time\n");
return -EIO;
}
dev_err(hdev->dev, "ELBI write has undefined bits in status\n");
return -EIO;
}
/**
* hl_pci_iatu_write() - iatu write routine.
* @hdev: Pointer to hl_device structure.
* @addr: Address to write to
* @data: Data to write
*
* Return: 0 on success, negative value for failure.
*/
int hl_pci_iatu_write(struct hl_device *hdev, u32 addr, u32 data)
{
struct asic_fixed_properties *prop = &hdev->asic_prop;
u32 dbi_offset;
int rc;
dbi_offset = addr & 0xFFF;
/* Ignore result of writing to pcie_aux_dbi_reg_addr as it could fail
* in case the firmware security is enabled
*/
hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr, 0x00300000);
rc = hl_pci_elbi_write(hdev, prop->pcie_dbi_base_address + dbi_offset,
data);
if (rc)
return -EIO;
return 0;
}
/**
* hl_pci_reset_link_through_bridge() - Reset PCI link.
* @hdev: Pointer to hl_device structure.
*/
static void hl_pci_reset_link_through_bridge(struct hl_device *hdev)
{
struct pci_dev *pdev = hdev->pdev;
struct pci_dev *parent_port;
u16 val;
parent_port = pdev->bus->self;
pci_read_config_word(parent_port, PCI_BRIDGE_CONTROL, &val);
val |= PCI_BRIDGE_CTL_BUS_RESET;
pci_write_config_word(parent_port, PCI_BRIDGE_CONTROL, val);
ssleep(1);
val &= ~(PCI_BRIDGE_CTL_BUS_RESET);
pci_write_config_word(parent_port, PCI_BRIDGE_CONTROL, val);
ssleep(3);
}
/**
* hl_pci_set_inbound_region() - Configure inbound region
* @hdev: Pointer to hl_device structure.
* @region: Inbound region number.
* @pci_region: Inbound region parameters.
*
* Configure the iATU inbound region.
*
* Return: 0 on success, negative value for failure.
*/
int hl_pci_set_inbound_region(struct hl_device *hdev, u8 region,
struct hl_inbound_pci_region *pci_region)
{
struct asic_fixed_properties *prop = &hdev->asic_prop;
u64 bar_phys_base, region_base, region_end_address;
u32 offset, ctrl_reg_val;
int rc = 0;
/* region offset */
offset = (0x200 * region) + 0x100;
if (pci_region->mode == PCI_ADDRESS_MATCH_MODE) {
bar_phys_base = hdev->pcie_bar_phys[pci_region->bar];
region_base = bar_phys_base + pci_region->offset_in_bar;
region_end_address = region_base + pci_region->size - 1;
rc |= hl_pci_iatu_write(hdev, offset + 0x8,
lower_32_bits(region_base));
rc |= hl_pci_iatu_write(hdev, offset + 0xC,
upper_32_bits(region_base));
rc |= hl_pci_iatu_write(hdev, offset + 0x10,
lower_32_bits(region_end_address));
}
/* Point to the specified address */
rc |= hl_pci_iatu_write(hdev, offset + 0x14,
lower_32_bits(pci_region->addr));
rc |= hl_pci_iatu_write(hdev, offset + 0x18,
upper_32_bits(pci_region->addr));
rc |= hl_pci_iatu_write(hdev, offset + 0x0, 0);
/* Enable + bar/address match + match enable + bar number */
ctrl_reg_val = FIELD_PREP(IATU_REGION_CTRL_REGION_EN_MASK, 1);
ctrl_reg_val |= FIELD_PREP(IATU_REGION_CTRL_MATCH_MODE_MASK,
pci_region->mode);
ctrl_reg_val |= FIELD_PREP(IATU_REGION_CTRL_NUM_MATCH_EN_MASK, 1);
if (pci_region->mode == PCI_BAR_MATCH_MODE)
ctrl_reg_val |= FIELD_PREP(IATU_REGION_CTRL_BAR_NUM_MASK,
pci_region->bar);
rc |= hl_pci_iatu_write(hdev, offset + 0x4, ctrl_reg_val);
/* Return the DBI window to the default location
* Ignore result of writing to pcie_aux_dbi_reg_addr as it could fail
* in case the firmware security is enabled
*/
hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr, 0);
if (rc)
dev_err(hdev->dev, "failed to map bar %u to 0x%08llx\n",
pci_region->bar, pci_region->addr);
return rc;
}
/**
* hl_pci_set_outbound_region() - Configure outbound region 0
* @hdev: Pointer to hl_device structure.
* @pci_region: Outbound region parameters.
*
* Configure the iATU outbound region 0.
*
* Return: 0 on success, negative value for failure.
*/
int hl_pci_set_outbound_region(struct hl_device *hdev,
struct hl_outbound_pci_region *pci_region)
{
struct asic_fixed_properties *prop = &hdev->asic_prop;
u64 outbound_region_end_address;
int rc = 0;
/* Outbound Region 0 */
outbound_region_end_address =
pci_region->addr + pci_region->size - 1;
rc |= hl_pci_iatu_write(hdev, 0x008,
lower_32_bits(pci_region->addr));
rc |= hl_pci_iatu_write(hdev, 0x00C,
upper_32_bits(pci_region->addr));
rc |= hl_pci_iatu_write(hdev, 0x010,
lower_32_bits(outbound_region_end_address));
rc |= hl_pci_iatu_write(hdev, 0x014, 0);
if ((hdev->power9_64bit_dma_enable) && (hdev->dma_mask == 64))
rc |= hl_pci_iatu_write(hdev, 0x018, 0x08000000);
else
rc |= hl_pci_iatu_write(hdev, 0x018, 0);
rc |= hl_pci_iatu_write(hdev, 0x020,
upper_32_bits(outbound_region_end_address));
/* Increase region size */
rc |= hl_pci_iatu_write(hdev, 0x000, 0x00002000);
/* Enable */
rc |= hl_pci_iatu_write(hdev, 0x004, 0x80000000);
/* Return the DBI window to the default location
* Ignore result of writing to pcie_aux_dbi_reg_addr as it could fail
* in case the firmware security is enabled
*/
hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr, 0);
return rc;
}
/**
* hl_pci_set_dma_mask() - Set DMA masks for the device.
* @hdev: Pointer to hl_device structure.
*
* This function sets the DMA masks (regular and consistent) for a specified
* value. If it doesn't succeed, it tries to set it to a fall-back value
*
* Return: 0 on success, non-zero for failure.
*/
static int hl_pci_set_dma_mask(struct hl_device *hdev)
{
struct pci_dev *pdev = hdev->pdev;
int rc;
/* set DMA mask */
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(hdev->dma_mask));
if (rc) {
dev_err(hdev->dev,
"Failed to set pci dma mask to %d bits, error %d\n",
hdev->dma_mask, rc);
return rc;
}
rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(hdev->dma_mask));
if (rc) {
dev_err(hdev->dev,
"Failed to set pci consistent dma mask to %d bits, error %d\n",
hdev->dma_mask, rc);
return rc;
}
return 0;
}
/**
* hl_pci_init() - PCI initialization code.
* @hdev: Pointer to hl_device structure.
* @cpu_boot_status_reg: status register of the device's CPU
* @boot_err0_reg: boot error register of the device's CPU
* @preboot_ver_timeout: how much to wait before bailing out on reading
* the preboot version
*
* Set DMA masks, initialize the PCI controller and map the PCI BARs.
*
* Return: 0 on success, non-zero for failure.
*/
int hl_pci_init(struct hl_device *hdev, u32 cpu_boot_status_reg,
u32 boot_err0_reg, u32 preboot_ver_timeout)
{
struct pci_dev *pdev = hdev->pdev;
int rc;
if (hdev->reset_pcilink)
hl_pci_reset_link_through_bridge(hdev);
rc = pci_enable_device_mem(pdev);
if (rc) {
dev_err(hdev->dev, "can't enable PCI device\n");
return rc;
}
pci_set_master(pdev);
rc = hdev->asic_funcs->pci_bars_map(hdev);
if (rc) {
dev_err(hdev->dev, "Failed to initialize PCI BARs\n");
goto disable_device;
}
rc = hdev->asic_funcs->init_iatu(hdev);
if (rc) {
dev_err(hdev->dev, "Failed to initialize iATU\n");
goto unmap_pci_bars;
}
rc = hl_pci_set_dma_mask(hdev);
if (rc)
goto unmap_pci_bars;
/* Before continuing in the initialization, we need to read the preboot
* version to determine whether we run with a security-enabled firmware
* The check will be done in each ASIC's specific code
*/
rc = hl_fw_read_preboot_ver(hdev, cpu_boot_status_reg, boot_err0_reg,
preboot_ver_timeout);
if (rc)
goto unmap_pci_bars;
return 0;
unmap_pci_bars:
hl_pci_bars_unmap(hdev);
disable_device:
pci_clear_master(pdev);
pci_disable_device(pdev);
return rc;
}
/**
* hl_fw_fini() - PCI finalization code.
* @hdev: Pointer to hl_device structure
*
* Unmap PCI bars and disable PCI device.
*/
void hl_pci_fini(struct hl_device *hdev)
{
hl_pci_bars_unmap(hdev);
pci_clear_master(hdev->pdev);
pci_disable_device(hdev->pdev);
}
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