1 files changed, 400 insertions, 0 deletions
diff --git a/drivers/misc/habanalabs/common/pci.c b/drivers/misc/habanalabs/common/pci.c
new file mode 100644
index 000000000000..1791f6623c69
--- /dev/null
+++ b/drivers/misc/habanalabs/common/pci.c
@@ -0,0 +1,400 @@
+// 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>
+#include <linux/bitfield.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) {
+		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.
+ * @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;
+
+	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_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 */
+	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 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 */
+	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);
+
+	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.
+ *
+ * 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)
+{
+	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 disable_device;
+	}
+
+	rc = hl_pci_set_dma_mask(hdev);
+	if (rc)
+		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);
+}