mips: octeon: Add Octeon PCIe host controller driver

This patch adds the PCIe host controller driver for MIPS Octeon II/III.
The driver mainly consist of the PCI config functions, as all of the
complex serdes related port / lane setup, is done in the serdes / pcie
code available in the "arch/mips/mach-octeon" directory.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Aaron Williams <awilliams@marvell.com>
Cc: Chandrakala Chavva <cchavva@marvell.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index cdcdd8f..d5b6018 100644 (file)
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -158,6 +158,12 @@ config PCI_OCTEONTX
          These controllers provide PCI configuration access to all on-board
          peripherals so it should only be disabled for testing purposes
 
+config PCIE_OCTEON
+       bool "MIPS Octeon PCIe support"
+       depends on ARCH_OCTEON
+       help
+         Enable support for the MIPS Octeon SoC family PCIe controllers.
+
 config PCI_XILINX
        bool "Xilinx AXI Bridge for PCI Express"
        depends on DM_PCI

diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 96d6182..1f74178 100644 (file)
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -53,3 +53,4 @@ obj-$(CONFIG_PCIE_DW_ROCKCHIP) += pcie_dw_rockchip.o
 obj-$(CONFIG_PCIE_DW_MESON) += pcie_dw_meson.o
 obj-$(CONFIG_PCI_BRCMSTB) += pcie_brcmstb.o
 obj-$(CONFIG_PCI_OCTEONTX) += pci_octeontx.o
+obj-$(CONFIG_PCIE_OCTEON) += pcie_octeon.o

diff --git a/drivers/pci/pcie_octeon.c b/drivers/pci/pcie_octeon.c
new file mode 100644 (file)
index 0000000..3b28bd8
--- /dev/null
+++ b/drivers/pci/pcie_octeon.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Stefan Roese <sr@denx.de>
+ */
+
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <log.h>
+#include <pci.h>
+#include <linux/delay.h>
+
+#include <mach/octeon-model.h>
+#include <mach/octeon_pci.h>
+#include <mach/cvmx-regs.h>
+#include <mach/cvmx-pcie.h>
+#include <mach/cvmx-pemx-defs.h>
+
+struct octeon_pcie {
+       void *base;
+       int first_busno;
+       u32 port;
+       struct udevice *dev;
+       int pcie_port;
+};
+
+static bool octeon_bdf_invalid(pci_dev_t bdf, int first_busno)
+{
+       /*
+        * In PCIe only a single device (0) can exist on the local bus.
+        * Beyound the local bus, there might be a switch and everything
+        * is possible.
+        */
+       if ((PCI_BUS(bdf) == first_busno) && (PCI_DEV(bdf) > 0))
+               return true;
+
+       return false;
+}
+
+static int pcie_octeon_write_config(struct udevice *bus, pci_dev_t bdf,
+                                   uint offset, ulong value,
+                                   enum pci_size_t size)
+{
+       struct octeon_pcie *pcie = dev_get_priv(bus);
+       struct pci_controller *hose = dev_get_uclass_priv(bus);
+       int busno;
+       int port;
+
+       debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
+             PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
+       debug("(addr,size,val)=(0x%04x, %d, 0x%08lx)\n", offset, size, value);
+
+       port = pcie->pcie_port;
+       busno = PCI_BUS(bdf) - hose->first_busno + 1;
+
+       switch (size) {
+       case PCI_SIZE_8:
+               cvmx_pcie_config_write8(port, busno, PCI_DEV(bdf),
+                                       PCI_FUNC(bdf), offset, value);
+               break;
+       case PCI_SIZE_16:
+               cvmx_pcie_config_write16(port, busno, PCI_DEV(bdf),
+                                        PCI_FUNC(bdf), offset, value);
+               break;
+       case PCI_SIZE_32:
+               cvmx_pcie_config_write32(port, busno, PCI_DEV(bdf),
+                                        PCI_FUNC(bdf), offset, value);
+               break;
+       default:
+               printf("Invalid size\n");
+       };
+
+       return 0;
+}
+
+static int pcie_octeon_read_config(const struct udevice *bus, pci_dev_t bdf,
+                                  uint offset, ulong *valuep,
+                                  enum pci_size_t size)
+{
+       struct octeon_pcie *pcie = dev_get_priv(bus);
+       struct pci_controller *hose = dev_get_uclass_priv(bus);
+       int busno;
+       int port;
+
+       port = pcie->pcie_port;
+       busno = PCI_BUS(bdf) - hose->first_busno + 1;
+       if (octeon_bdf_invalid(bdf, pcie->first_busno)) {
+               *valuep = pci_get_ff(size);
+               return 0;
+       }
+
+       switch (size) {
+       case PCI_SIZE_8:
+               *valuep = cvmx_pcie_config_read8(port, busno, PCI_DEV(bdf),
+                                                PCI_FUNC(bdf), offset);
+               break;
+       case PCI_SIZE_16:
+               *valuep = cvmx_pcie_config_read16(port, busno, PCI_DEV(bdf),
+                                                 PCI_FUNC(bdf), offset);
+               break;
+       case PCI_SIZE_32:
+               *valuep = cvmx_pcie_config_read32(port, busno, PCI_DEV(bdf),
+                                                 PCI_FUNC(bdf), offset);
+               break;
+       default:
+               printf("Invalid size\n");
+       };
+
+       debug("%02x.%02x.%02x: u%d %x -> %lx\n",
+             PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), size, offset, *valuep);
+
+       return 0;
+}
+
+static int pcie_octeon_probe(struct udevice *dev)
+{
+       struct octeon_pcie *pcie = dev_get_priv(dev);
+       int node = cvmx_get_node_num();
+       int pcie_port;
+       int ret = 0;
+
+       /* Get port number, lane number and memory target / attr */
+       if (ofnode_read_u32(dev_ofnode(dev), "marvell,pcie-port",
+                           &pcie->port)) {
+               ret = -ENODEV;
+               goto err;
+       }
+
+       pcie->first_busno = dev_seq(dev);
+       pcie_port = ((node << 4) | pcie->port);
+       ret = cvmx_pcie_rc_initialize(pcie_port);
+       if (ret != 0)
+               return ret;
+
+       return 0;
+
+err:
+       return ret;
+}
+
+static const struct dm_pci_ops pcie_octeon_ops = {
+       .read_config = pcie_octeon_read_config,
+       .write_config = pcie_octeon_write_config,
+};
+
+static const struct udevice_id pcie_octeon_ids[] = {
+       { .compatible = "marvell,pcie-host-octeon" },
+       { }
+};
+
+U_BOOT_DRIVER(pcie_octeon) = {
+       .name           = "pcie_octeon",
+       .id             = UCLASS_PCI,
+       .of_match       = pcie_octeon_ids,
+       .ops            = &pcie_octeon_ops,
+       .probe          = pcie_octeon_probe,
+       .priv_auto      = sizeof(struct octeon_pcie),
+       .flags          = DM_FLAG_PRE_RELOC,
+};