+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Intel FPGA PCIe host controller driver
- *
- * Copyright (C) 2013-2018 Intel Corporation. All rights reserved
- *
- */
-
-#include <dm.h>
-#include <pci.h>
-#include <asm/global_data.h>
-#include <asm/io.h>
-#include <dm/device_compat.h>
-#include <linux/bitops.h>
-#include <linux/delay.h>
-
-#define RP_TX_REG0 0x2000
-#define RP_TX_CNTRL 0x2004
-#define RP_TX_SOP BIT(0)
-#define RP_TX_EOP BIT(1)
-#define RP_RXCPL_STATUS 0x200C
-#define RP_RXCPL_SOP BIT(0)
-#define RP_RXCPL_EOP BIT(1)
-#define RP_RXCPL_REG 0x2008
-#define P2A_INT_STATUS 0x3060
-#define P2A_INT_STS_ALL 0xf
-#define P2A_INT_ENABLE 0x3070
-#define RP_CAP_OFFSET 0x70
-
-/* TLP configuration type 0 and 1 */
-#define TLP_FMTTYPE_CFGRD0 0x04 /* Configuration Read Type 0 */
-#define TLP_FMTTYPE_CFGWR0 0x44 /* Configuration Write Type 0 */
-#define TLP_FMTTYPE_CFGRD1 0x05 /* Configuration Read Type 1 */
-#define TLP_FMTTYPE_CFGWR1 0x45 /* Configuration Write Type 1 */
-#define TLP_PAYLOAD_SIZE 0x01
-#define TLP_READ_TAG 0x1d
-#define TLP_WRITE_TAG 0x10
-#define RP_DEVFN 0
-
-#define RP_CFG_ADDR(pcie, reg) \
- ((pcie->hip_base) + (reg) + (1 << 20))
-#define RP_SECONDARY(pcie) \
- readb(RP_CFG_ADDR(pcie, PCI_SECONDARY_BUS))
-#define TLP_REQ_ID(bus, devfn) (((bus) << 8) | (devfn))
-
-#define TLP_CFGRD_DW0(pcie, bus) \
- ((((bus > RP_SECONDARY(pcie)) ? TLP_FMTTYPE_CFGRD1 \
- : TLP_FMTTYPE_CFGRD0) << 24) | \
- TLP_PAYLOAD_SIZE)
-
-#define TLP_CFGWR_DW0(pcie, bus) \
- ((((bus > RP_SECONDARY(pcie)) ? TLP_FMTTYPE_CFGWR1 \
- : TLP_FMTTYPE_CFGWR0) << 24) | \
- TLP_PAYLOAD_SIZE)
-
-#define TLP_CFG_DW1(pcie, tag, be) \
- (((TLP_REQ_ID(pcie->first_busno, RP_DEVFN)) << 16) | (tag << 8) | (be))
-#define TLP_CFG_DW2(bus, dev, fn, offset) \
- (((bus) << 24) | ((dev) << 19) | ((fn) << 16) | (offset))
-
-#define TLP_COMP_STATUS(s) (((s) >> 13) & 7)
-#define TLP_BYTE_COUNT(s) (((s) >> 0) & 0xfff)
-#define TLP_HDR_SIZE 3
-#define TLP_LOOP 20000
-#define DWORD_MASK 3
-
-#define IS_ROOT_PORT(pcie, bdf) \
- ((PCI_BUS(bdf) == pcie->first_busno) ? true : false)
-
-/**
- * struct intel_fpga_pcie - Intel FPGA PCIe controller state
- * @bus: Pointer to the PCI bus
- * @cra_base: The base address of CRA register space
- * @hip_base: The base address of Rootport configuration space
- * @first_busno: This driver supports multiple PCIe controllers.
- * first_busno stores the bus number of the PCIe root-port
- * number which may vary depending on the PCIe setup.
- */
-struct intel_fpga_pcie {
- struct udevice *bus;
- void __iomem *cra_base;
- void __iomem *hip_base;
- int first_busno;
-};
-
-/**
- * Intel FPGA PCIe port uses BAR0 of RC's configuration space as the
- * translation from PCI bus to native BUS. Entire DDR region is mapped
- * into PCIe space using these registers, so it can be reached by DMA from
- * EP devices.
- * The BAR0 of bridge should be hidden during enumeration to avoid the
- * sizing and resource allocation by PCIe core.
- */
-static bool intel_fpga_pcie_hide_rc_bar(struct intel_fpga_pcie *pcie,
- pci_dev_t bdf, int offset)
-{
- if (IS_ROOT_PORT(pcie, bdf) && PCI_DEV(bdf) == 0 &&
- PCI_FUNC(bdf) == 0 && offset == PCI_BASE_ADDRESS_0)
- return true;
-
- return false;
-}
-
-static inline void cra_writel(struct intel_fpga_pcie *pcie, const u32 value,
- const u32 reg)
-{
- writel(value, pcie->cra_base + reg);
-}
-
-static inline u32 cra_readl(struct intel_fpga_pcie *pcie, const u32 reg)
-{
- return readl(pcie->cra_base + reg);
-}
-
-static bool intel_fpga_pcie_link_up(struct intel_fpga_pcie *pcie)
-{
- return !!(readw(RP_CFG_ADDR(pcie, RP_CAP_OFFSET + PCI_EXP_LNKSTA))
- & PCI_EXP_LNKSTA_DLLLA);
-}
-
-static bool intel_fpga_pcie_addr_valid(struct intel_fpga_pcie *pcie,
- pci_dev_t bdf)
-{
- /* If there is no link, then there is no device */
- if (!IS_ROOT_PORT(pcie, bdf) && !intel_fpga_pcie_link_up(pcie))
- return false;
-
- /* access only one slot on each root port */
- if (IS_ROOT_PORT(pcie, bdf) && PCI_DEV(bdf) > 0)
- return false;
-
- if ((PCI_BUS(bdf) == pcie->first_busno + 1) && PCI_DEV(bdf) > 0)
- return false;
-
- return true;
-}
-
-static void tlp_write_tx(struct intel_fpga_pcie *pcie, u32 reg0, u32 ctrl)
-{
- cra_writel(pcie, reg0, RP_TX_REG0);
- cra_writel(pcie, ctrl, RP_TX_CNTRL);
-}
-
-static int tlp_read_packet(struct intel_fpga_pcie *pcie, u32 *value)
-{
- int i;
- u32 ctrl;
- u32 comp_status;
- u32 dw[4];
- u32 count = 0;
-
- for (i = 0; i < TLP_LOOP; i++) {
- ctrl = cra_readl(pcie, RP_RXCPL_STATUS);
- if (!(ctrl & RP_RXCPL_SOP))
- continue;
-
- /* read first DW */
- dw[count++] = cra_readl(pcie, RP_RXCPL_REG);
-
- /* Poll for EOP */
- for (i = 0; i < TLP_LOOP; i++) {
- ctrl = cra_readl(pcie, RP_RXCPL_STATUS);
- dw[count++] = cra_readl(pcie, RP_RXCPL_REG);
- if (ctrl & RP_RXCPL_EOP) {
- comp_status = TLP_COMP_STATUS(dw[1]);
- if (comp_status) {
- *value = pci_get_ff(PCI_SIZE_32);
- return 0;
- }
-
- if (value &&
- TLP_BYTE_COUNT(dw[1]) == sizeof(u32) &&
- count >= 3)
- *value = dw[3];
-
- return 0;
- }
- }
-
- udelay(5);
- }
-
- dev_err(pcie->dev, "read TLP packet timed out\n");
- return -ENODEV;
-}
-
-static void tlp_write_packet(struct intel_fpga_pcie *pcie, u32 *headers,
- u32 data)
-{
- tlp_write_tx(pcie, headers[0], RP_TX_SOP);
-
- tlp_write_tx(pcie, headers[1], 0);
-
- tlp_write_tx(pcie, headers[2], 0);
-
- tlp_write_tx(pcie, data, RP_TX_EOP);
-}
-
-static int tlp_cfg_dword_read(struct intel_fpga_pcie *pcie, pci_dev_t bdf,
- int offset, u8 byte_en, u32 *value)
-{
- u32 headers[TLP_HDR_SIZE];
- u8 busno = PCI_BUS(bdf);
-
- headers[0] = TLP_CFGRD_DW0(pcie, busno);
- headers[1] = TLP_CFG_DW1(pcie, TLP_READ_TAG, byte_en);
- headers[2] = TLP_CFG_DW2(busno, PCI_DEV(bdf), PCI_FUNC(bdf), offset);
-
- tlp_write_packet(pcie, headers, 0);
-
- return tlp_read_packet(pcie, value);
-}
-
-static int tlp_cfg_dword_write(struct intel_fpga_pcie *pcie, pci_dev_t bdf,
- int offset, u8 byte_en, u32 value)
-{
- u32 headers[TLP_HDR_SIZE];
- u8 busno = PCI_BUS(bdf);
-
- headers[0] = TLP_CFGWR_DW0(pcie, busno);
- headers[1] = TLP_CFG_DW1(pcie, TLP_WRITE_TAG, byte_en);
- headers[2] = TLP_CFG_DW2(busno, PCI_DEV(bdf), PCI_FUNC(bdf), offset);
-
- tlp_write_packet(pcie, headers, value);
-
- return tlp_read_packet(pcie, NULL);
-}
-
-int intel_fpga_rp_conf_addr(const struct udevice *bus, pci_dev_t bdf,
- uint offset, void **paddress)
-{
- struct intel_fpga_pcie *pcie = dev_get_priv(bus);
-
- *paddress = RP_CFG_ADDR(pcie, offset);
-
- return 0;
-}
-
-static int intel_fpga_pcie_rp_rd_conf(struct udevice *bus, pci_dev_t bdf,
- uint offset, ulong *valuep,
- enum pci_size_t size)
-{
- return pci_generic_mmap_read_config(bus, intel_fpga_rp_conf_addr,
- bdf, offset, valuep, size);
-}
-
-static int intel_fpga_pcie_rp_wr_conf(struct udevice *bus, pci_dev_t bdf,
- uint offset, ulong value,
- enum pci_size_t size)
-{
- int ret;
- struct intel_fpga_pcie *pcie = dev_get_priv(bus);
-
- ret = pci_generic_mmap_write_config(bus, intel_fpga_rp_conf_addr,
- bdf, offset, value, size);
- if (!ret) {
- /* Monitor changes to PCI_PRIMARY_BUS register on root port
- * and update local copy of root bus number accordingly.
- */
- if (offset == PCI_PRIMARY_BUS)
- pcie->first_busno = (u8)(value);
- }
-
- return ret;
-}
-
-static u8 pcie_get_byte_en(uint offset, enum pci_size_t size)
-{
- switch (size) {
- case PCI_SIZE_8:
- return 1 << (offset & 3);
- case PCI_SIZE_16:
- return 3 << (offset & 3);
- default:
- return 0xf;
- }
-}
-
-static int _pcie_intel_fpga_read_config(struct intel_fpga_pcie *pcie,
- pci_dev_t bdf, uint offset,
- ulong *valuep, enum pci_size_t size)
-{
- int ret;
- u32 data;
- u8 byte_en;
-
- /* Uses memory mapped method to read rootport config registers */
- if (IS_ROOT_PORT(pcie, bdf))
- return intel_fpga_pcie_rp_rd_conf(pcie->bus, bdf,
- offset, valuep, size);
-
- byte_en = pcie_get_byte_en(offset, size);
- ret = tlp_cfg_dword_read(pcie, bdf, offset & ~DWORD_MASK,
- byte_en, &data);
- if (ret)
- return ret;
-
- dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08x)\n",
- offset, size, data);
- *valuep = pci_conv_32_to_size(data, offset, size);
-
- return 0;
-}
-
-static int _pcie_intel_fpga_write_config(struct intel_fpga_pcie *pcie,
- pci_dev_t bdf, uint offset,
- ulong value, enum pci_size_t size)
-{
- u32 data;
- u8 byte_en;
-
- dev_dbg(pcie->dev, "PCIE CFG write: (b.d.f)=(%02d.%02d.%02d)\n",
- PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
- dev_dbg(pcie->dev, "(addr,size,val)=(0x%04x, %d, 0x%08lx)\n",
- offset, size, value);
-
- /* Uses memory mapped method to read rootport config registers */
- if (IS_ROOT_PORT(pcie, bdf))
- return intel_fpga_pcie_rp_wr_conf(pcie->bus, bdf, offset,
- value, size);
-
- byte_en = pcie_get_byte_en(offset, size);
- data = pci_conv_size_to_32(0, value, offset, size);
-
- return tlp_cfg_dword_write(pcie, bdf, offset & ~DWORD_MASK,
- byte_en, data);
-}
-
-static int pcie_intel_fpga_read_config(const struct udevice *bus, pci_dev_t bdf,
- uint offset, ulong *valuep,
- enum pci_size_t size)
-{
- struct intel_fpga_pcie *pcie = dev_get_priv(bus);
-
- dev_dbg(pcie->dev, "PCIE CFG read: (b.d.f)=(%02d.%02d.%02d)\n",
- PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
-
- if (intel_fpga_pcie_hide_rc_bar(pcie, bdf, offset)) {
- *valuep = (u32)pci_get_ff(size);
- return 0;
- }
-
- if (!intel_fpga_pcie_addr_valid(pcie, bdf)) {
- *valuep = (u32)pci_get_ff(size);
- return 0;
- }
-
- return _pcie_intel_fpga_read_config(pcie, bdf, offset, valuep, size);
-}
-
-static int pcie_intel_fpga_write_config(struct udevice *bus, pci_dev_t bdf,
- uint offset, ulong value,
- enum pci_size_t size)
-{
- struct intel_fpga_pcie *pcie = dev_get_priv(bus);
-
- if (intel_fpga_pcie_hide_rc_bar(pcie, bdf, offset))
- return 0;
-
- if (!intel_fpga_pcie_addr_valid(pcie, bdf))
- return 0;
-
- return _pcie_intel_fpga_write_config(pcie, bdf, offset, value,
- size);
-}
-
-static int pcie_intel_fpga_probe(struct udevice *dev)
-{
- struct intel_fpga_pcie *pcie = dev_get_priv(dev);
-
- pcie->bus = pci_get_controller(dev);
- pcie->first_busno = dev_seq(dev);
-
- /* clear all interrupts */
- cra_writel(pcie, P2A_INT_STS_ALL, P2A_INT_STATUS);
- /* disable all interrupts */
- cra_writel(pcie, 0, P2A_INT_ENABLE);
-
- return 0;
-}
-
-static int pcie_intel_fpga_of_to_plat(struct udevice *dev)
-{
- struct intel_fpga_pcie *pcie = dev_get_priv(dev);
- struct fdt_resource reg_res;
- int node = dev_of_offset(dev);
- int ret;
-
- DECLARE_GLOBAL_DATA_PTR;
-
- ret = fdt_get_named_resource(gd->fdt_blob, node, "reg", "reg-names",
- "Cra", ®_res);
- if (ret) {
- dev_err(dev, "resource \"Cra\" not found\n");
- return ret;
- }
-
- pcie->cra_base = map_physmem(reg_res.start,
- fdt_resource_size(®_res),
- MAP_NOCACHE);
-
- ret = fdt_get_named_resource(gd->fdt_blob, node, "reg", "reg-names",
- "Hip", ®_res);
- if (ret) {
- dev_err(dev, "resource \"Hip\" not found\n");
- return ret;
- }
-
- pcie->hip_base = map_physmem(reg_res.start,
- fdt_resource_size(®_res),
- MAP_NOCACHE);
-
- return 0;
-}
-
-static const struct dm_pci_ops pcie_intel_fpga_ops = {
- .read_config = pcie_intel_fpga_read_config,
- .write_config = pcie_intel_fpga_write_config,
-};
-
-static const struct udevice_id pcie_intel_fpga_ids[] = {
- { .compatible = "altr,pcie-root-port-2.0" },
- {},
-};
-
-U_BOOT_DRIVER(pcie_intel_fpga) = {
- .name = "pcie_intel_fpga",
- .id = UCLASS_PCI,
- .of_match = pcie_intel_fpga_ids,
- .ops = &pcie_intel_fpga_ops,
- .of_to_plat = pcie_intel_fpga_of_to_plat,
- .probe = pcie_intel_fpga_probe,
- .priv_auto = sizeof(struct intel_fpga_pcie),
-};
projects / thirdparty / u-boot.git / commitdiff
