diff options
Diffstat (limited to 'drivers/misc/habanalabs/common/pci.c')
| -rw-r--r-- | drivers/misc/habanalabs/common/pci.c | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/drivers/misc/habanalabs/common/pci.c b/drivers/misc/habanalabs/common/pci.c new file mode 100644 index 000000000..607f9a11f --- /dev/null +++ b/drivers/misc/habanalabs/common/pci.c @@ -0,0 +1,421 @@ +// 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); +} |