Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/misc/habanalabs/pci.c b/drivers/misc/habanalabs/pci.c
new file mode 100644
index 0000000..c98d88c
--- /dev/null
+++ b/drivers/misc/habanalabs/pci.c
@@ -0,0 +1,416 @@
+// 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)
+
+/**
+ * hl_pci_bars_map() - Map PCI BARs.
+ * @hdev: Pointer to hl_device structure.
+ * @bar_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.
+ *
+ * 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) {
+ dev_err(hdev->dev, "Error writing to ELBI\n");
+ 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.
+ *
+ * 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;
+
+ rc = 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_dram_bar_base() - Set DDR BAR to map specific device address.
+ * @hdev: Pointer to hl_device structure.
+ * @inbound_region: Inbound region number.
+ * @bar: PCI BAR number.
+ * @addr: Address in DRAM. Must be aligned to DRAM bar size.
+ *
+ * Configure the iATU so that the DRAM bar will start at the specified address.
+ *
+ * Return: 0 on success, negative value for failure.
+ */
+int hl_pci_set_dram_bar_base(struct hl_device *hdev, u8 inbound_region, u8 bar,
+ u64 addr)
+{
+ struct asic_fixed_properties *prop = &hdev->asic_prop;
+ u32 offset;
+ int rc;
+
+ switch (inbound_region) {
+ case 0:
+ offset = 0x100;
+ break;
+ case 1:
+ offset = 0x300;
+ break;
+ case 2:
+ offset = 0x500;
+ break;
+ default:
+ dev_err(hdev->dev, "Invalid inbound region %d\n",
+ inbound_region);
+ return -EINVAL;
+ }
+
+ if (bar != 0 && bar != 2 && bar != 4) {
+ dev_err(hdev->dev, "Invalid PCI BAR %d\n", bar);
+ return -EINVAL;
+ }
+
+ /* Point to the specified address */
+ rc = hl_pci_iatu_write(hdev, offset + 0x14, lower_32_bits(addr));
+ rc |= hl_pci_iatu_write(hdev, offset + 0x18, upper_32_bits(addr));
+ rc |= hl_pci_iatu_write(hdev, offset + 0x0, 0);
+ /* Enable + BAR match + match enable + BAR number */
+ rc |= hl_pci_iatu_write(hdev, offset + 0x4, 0xC0080000 | (bar << 8));
+
+ /* Return the DBI window to the default location */
+ rc |= hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr, 0);
+ rc |= hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr + 4, 0);
+
+ if (rc)
+ dev_err(hdev->dev, "failed to map DRAM bar to 0x%08llx\n",
+ addr);
+
+ return rc;
+}
+
+/**
+ * hl_pci_init_iatu() - Initialize the iATU unit inside the PCI controller.
+ * @hdev: Pointer to hl_device structure.
+ * @sram_base_address: SRAM base address.
+ * @dram_base_address: DRAM base address.
+ * @host_phys_base_address: Base physical address of host memory for device
+ * transactions.
+ * @host_phys_size: Size of host memory for device transactions.
+ *
+ * This is needed in case the firmware doesn't initialize the iATU.
+ *
+ * Return: 0 on success, negative value for failure.
+ */
+int hl_pci_init_iatu(struct hl_device *hdev, u64 sram_base_address,
+ u64 dram_base_address, u64 host_phys_base_address,
+ u64 host_phys_size)
+{
+ struct asic_fixed_properties *prop = &hdev->asic_prop;
+ u64 host_phys_end_addr;
+ int rc = 0;
+
+ /* Inbound Region 0 - Bar 0 - Point to SRAM base address */
+ rc = hl_pci_iatu_write(hdev, 0x114, lower_32_bits(sram_base_address));
+ rc |= hl_pci_iatu_write(hdev, 0x118, upper_32_bits(sram_base_address));
+ rc |= hl_pci_iatu_write(hdev, 0x100, 0);
+ /* Enable + Bar match + match enable */
+ rc |= hl_pci_iatu_write(hdev, 0x104, 0xC0080000);
+
+ /* Point to DRAM */
+ if (!hdev->asic_funcs->set_dram_bar_base)
+ return -EINVAL;
+ if (hdev->asic_funcs->set_dram_bar_base(hdev, dram_base_address) ==
+ U64_MAX)
+ return -EIO;
+
+
+ /* Outbound Region 0 - Point to Host */
+ host_phys_end_addr = host_phys_base_address + host_phys_size - 1;
+ rc |= hl_pci_iatu_write(hdev, 0x008,
+ lower_32_bits(host_phys_base_address));
+ rc |= hl_pci_iatu_write(hdev, 0x00C,
+ upper_32_bits(host_phys_base_address));
+ rc |= hl_pci_iatu_write(hdev, 0x010, lower_32_bits(host_phys_end_addr));
+ rc |= hl_pci_iatu_write(hdev, 0x014, 0);
+ rc |= hl_pci_iatu_write(hdev, 0x018, 0);
+ rc |= hl_pci_iatu_write(hdev, 0x020, upper_32_bits(host_phys_end_addr));
+ /* 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 */
+ rc |= hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr, 0);
+ rc |= hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr + 4, 0);
+
+ if (rc)
+ return -EIO;
+
+ return 0;
+}
+
+/**
+ * hl_pci_set_dma_mask() - Set DMA masks for the device.
+ * @hdev: Pointer to hl_device structure.
+ * @dma_mask: number of bits for the requested dma mask.
+ *
+ * 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.
+ */
+int hl_pci_set_dma_mask(struct hl_device *hdev, u8 dma_mask)
+{
+ struct pci_dev *pdev = hdev->pdev;
+ int rc;
+
+ /* set DMA mask */
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(dma_mask));
+ if (rc) {
+ dev_warn(hdev->dev,
+ "Failed to set pci dma mask to %d bits, error %d\n",
+ dma_mask, rc);
+
+ dma_mask = hdev->dma_mask;
+
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(dma_mask));
+ if (rc) {
+ dev_err(hdev->dev,
+ "Failed to set pci dma mask to %d bits, error %d\n",
+ dma_mask, rc);
+ return rc;
+ }
+ }
+
+ /*
+ * We managed to set the dma mask, so update the dma mask field. If
+ * the set to the coherent mask will fail with that mask, we will
+ * fail the entire function
+ */
+ hdev->dma_mask = dma_mask;
+
+ rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(dma_mask));
+ if (rc) {
+ dev_err(hdev->dev,
+ "Failed to set pci consistent dma mask to %d bits, error %d\n",
+ dma_mask, rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+/**
+ * hl_pci_init() - PCI initialization code.
+ * @hdev: Pointer to hl_device structure.
+ * @dma_mask: number of bits for the requested dma mask.
+ *
+ * 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, u8 dma_mask)
+{
+ struct pci_dev *pdev = hdev->pdev;
+ int rc;
+
+ rc = hl_pci_set_dma_mask(hdev, dma_mask);
+ if (rc)
+ return 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->init_iatu(hdev);
+ if (rc) {
+ dev_err(hdev->dev, "Failed to initialize iATU\n");
+ goto disable_device;
+ }
+
+ rc = hdev->asic_funcs->pci_bars_map(hdev);
+ if (rc) {
+ dev_err(hdev->dev, "Failed to initialize PCI BARs\n");
+ goto disable_device;
+ }
+
+ return 0;
+
+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);
+}