summaryrefslogtreecommitdiffstats
path: root/drivers/pci/host/pci-thunder-ecam.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci/host/pci-thunder-ecam.c')
-rw-r--r--drivers/pci/host/pci-thunder-ecam.c403
1 files changed, 403 insertions, 0 deletions
diff --git a/drivers/pci/host/pci-thunder-ecam.c b/drivers/pci/host/pci-thunder-ecam.c
new file mode 100644
index 000000000000..d71935cb2678
--- /dev/null
+++ b/drivers/pci/host/pci-thunder-ecam.c
@@ -0,0 +1,403 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2015, 2016 Cavium, Inc.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/of_pci.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include "pci-host-common.h"
+
+/* Mapping is standard ECAM */
+static void __iomem *thunder_ecam_map_bus(struct pci_bus *bus,
+ unsigned int devfn,
+ int where)
+{
+ struct gen_pci *pci = bus->sysdata;
+ resource_size_t idx = bus->number - pci->cfg.bus_range->start;
+
+ return pci->cfg.win[idx] + ((devfn << 12) | where);
+}
+
+static void set_val(u32 v, int where, int size, u32 *val)
+{
+ int shift = (where & 3) * 8;
+
+ pr_debug("set_val %04x: %08x\n", (unsigned)(where & ~3), v);
+ v >>= shift;
+ if (size == 1)
+ v &= 0xff;
+ else if (size == 2)
+ v &= 0xffff;
+ *val = v;
+}
+
+static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
+ unsigned int devfn, int where, int size, u32 *val)
+{
+ void __iomem *addr;
+ u32 v;
+
+ /* Entries are 16-byte aligned; bits[2,3] select word in entry */
+ int where_a = where & 0xc;
+
+ if (where_a == 0) {
+ set_val(e0, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0x4) {
+ addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+ v = readl(addr);
+ v &= ~0xf;
+ v |= 2; /* EA entry-1. Base-L */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0x8) {
+ u32 barl_orig;
+ u32 barl_rb;
+
+ addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+ barl_orig = readl(addr + 0);
+ writel(0xffffffff, addr + 0);
+ barl_rb = readl(addr + 0);
+ writel(barl_orig, addr + 0);
+ /* zeros in unsettable bits */
+ v = ~barl_rb & ~3;
+ v |= 0xc; /* EA entry-2. Offset-L */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0xc) {
+ addr = bus->ops->map_bus(bus, devfn, bar + 4); /* BAR 1 */
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+ v = readl(addr); /* EA entry-3. Base-H */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+static int thunder_ecam_p2_config_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ struct gen_pci *pci = bus->sysdata;
+ int where_a = where & ~3;
+ void __iomem *addr;
+ u32 node_bits;
+ u32 v;
+
+ /* EA Base[63:32] may be missing some bits ... */
+ switch (where_a) {
+ case 0xa8:
+ case 0xbc:
+ case 0xd0:
+ case 0xe4:
+ break;
+ default:
+ return pci_generic_config_read(bus, devfn, where, size, val);
+ }
+
+ addr = bus->ops->map_bus(bus, devfn, where_a);
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+
+ v = readl(addr);
+
+ /*
+ * Bit 44 of the 64-bit Base must match the same bit in
+ * the config space access window. Since we are working with
+ * the high-order 32 bits, shift everything down by 32 bits.
+ */
+ node_bits = (pci->cfg.res.start >> 32) & (1 << 12);
+
+ v |= node_bits;
+ set_val(v, where, size, val);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ u32 v;
+ u32 vendor_device;
+ u32 class_rev;
+ void __iomem *addr;
+ int cfg_type;
+ int where_a = where & ~3;
+
+ addr = bus->ops->map_bus(bus, devfn, 0xc);
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+
+ v = readl(addr);
+
+ /* Check for non type-00 header */
+ cfg_type = (v >> 16) & 0x7f;
+
+ addr = bus->ops->map_bus(bus, devfn, 8);
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+
+ class_rev = readl(addr);
+ if (class_rev == 0xffffffff)
+ goto no_emulation;
+
+ if ((class_rev & 0xff) >= 8) {
+ /* Pass-2 handling */
+ if (cfg_type)
+ goto no_emulation;
+ return thunder_ecam_p2_config_read(bus, devfn, where,
+ size, val);
+ }
+
+ /*
+ * All BARs have fixed addresses specified by the EA
+ * capability; they must return zero on read.
+ */
+ if (cfg_type == 0 &&
+ ((where >= 0x10 && where < 0x2c) ||
+ (where >= 0x1a4 && where < 0x1bc))) {
+ /* BAR or SR-IOV BAR */
+ *val = 0;
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ addr = bus->ops->map_bus(bus, devfn, 0);
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+
+ vendor_device = readl(addr);
+ if (vendor_device == 0xffffffff)
+ goto no_emulation;
+
+ pr_debug("%04x:%04x - Fix pass#: %08x, where: %03x, devfn: %03x\n",
+ vendor_device & 0xffff, vendor_device >> 16, class_rev,
+ (unsigned) where, devfn);
+
+ /* Check for non type-00 header */
+ if (cfg_type == 0) {
+ bool has_msix;
+ bool is_nic = (vendor_device == 0xa01e177d);
+ bool is_tns = (vendor_device == 0xa01f177d);
+
+ addr = bus->ops->map_bus(bus, devfn, 0x70);
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+ /* E_CAP */
+ v = readl(addr);
+ has_msix = (v & 0xff00) != 0;
+
+ if (!has_msix && where_a == 0x70) {
+ v |= 0xbc00; /* next capability is EA at 0xbc */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0xb0) {
+ addr = bus->ops->map_bus(bus, devfn, where_a);
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+ v = readl(addr);
+ if (v & 0xff00)
+ pr_err("Bad MSIX cap header: %08x\n", v);
+ v |= 0xbc00; /* next capability is EA at 0xbc */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0xbc) {
+ if (is_nic)
+ v = 0x40014; /* EA last in chain, 4 entries */
+ else if (is_tns)
+ v = 0x30014; /* EA last in chain, 3 entries */
+ else if (has_msix)
+ v = 0x20014; /* EA last in chain, 2 entries */
+ else
+ v = 0x10014; /* EA last in chain, 1 entry */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a >= 0xc0 && where_a < 0xd0)
+ /* EA entry-0. PP=0, BAR0 Size:3 */
+ return handle_ea_bar(0x80ff0003,
+ 0x10, bus, devfn, where,
+ size, val);
+ if (where_a >= 0xd0 && where_a < 0xe0 && has_msix)
+ /* EA entry-1. PP=0, BAR4 Size:3 */
+ return handle_ea_bar(0x80ff0043,
+ 0x20, bus, devfn, where,
+ size, val);
+ if (where_a >= 0xe0 && where_a < 0xf0 && is_tns)
+ /* EA entry-2. PP=0, BAR2, Size:3 */
+ return handle_ea_bar(0x80ff0023,
+ 0x18, bus, devfn, where,
+ size, val);
+ if (where_a >= 0xe0 && where_a < 0xf0 && is_nic)
+ /* EA entry-2. PP=4, VF_BAR0 (9), Size:3 */
+ return handle_ea_bar(0x80ff0493,
+ 0x1a4, bus, devfn, where,
+ size, val);
+ if (where_a >= 0xf0 && where_a < 0x100 && is_nic)
+ /* EA entry-3. PP=4, VF_BAR4 (d), Size:3 */
+ return handle_ea_bar(0x80ff04d3,
+ 0x1b4, bus, devfn, where,
+ size, val);
+ } else if (cfg_type == 1) {
+ bool is_rsl_bridge = devfn == 0x08;
+ bool is_rad_bridge = devfn == 0xa0;
+ bool is_zip_bridge = devfn == 0xa8;
+ bool is_dfa_bridge = devfn == 0xb0;
+ bool is_nic_bridge = devfn == 0x10;
+
+ if (where_a == 0x70) {
+ addr = bus->ops->map_bus(bus, devfn, where_a);
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+ v = readl(addr);
+ if (v & 0xff00)
+ pr_err("Bad PCIe cap header: %08x\n", v);
+ v |= 0xbc00; /* next capability is EA at 0xbc */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0xbc) {
+ if (is_nic_bridge)
+ v = 0x10014; /* EA last in chain, 1 entry */
+ else
+ v = 0x00014; /* EA last in chain, no entries */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0xc0) {
+ if (is_rsl_bridge || is_nic_bridge)
+ v = 0x0101; /* subordinate:secondary = 1:1 */
+ else if (is_rad_bridge)
+ v = 0x0202; /* subordinate:secondary = 2:2 */
+ else if (is_zip_bridge)
+ v = 0x0303; /* subordinate:secondary = 3:3 */
+ else if (is_dfa_bridge)
+ v = 0x0404; /* subordinate:secondary = 4:4 */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0xc4 && is_nic_bridge) {
+ /* Enabled, not-Write, SP=ff, PP=05, BEI=6, ES=4 */
+ v = 0x80ff0564;
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0xc8 && is_nic_bridge) {
+ v = 0x00000002; /* Base-L 64-bit */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0xcc && is_nic_bridge) {
+ v = 0xfffffffe; /* MaxOffset-L 64-bit */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0xd0 && is_nic_bridge) {
+ v = 0x00008430; /* NIC Base-H */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ if (where_a == 0xd4 && is_nic_bridge) {
+ v = 0x0000000f; /* MaxOffset-H */
+ set_val(v, where, size, val);
+ return PCIBIOS_SUCCESSFUL;
+ }
+ }
+no_emulation:
+ return pci_generic_config_read(bus, devfn, where, size, val);
+}
+
+static int thunder_ecam_config_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ /*
+ * All BARs have fixed addresses; ignore BAR writes so they
+ * don't get corrupted.
+ */
+ if ((where >= 0x10 && where < 0x2c) ||
+ (where >= 0x1a4 && where < 0x1bc))
+ /* BAR or SR-IOV BAR */
+ return PCIBIOS_SUCCESSFUL;
+
+ return pci_generic_config_write(bus, devfn, where, size, val);
+}
+
+static struct gen_pci_cfg_bus_ops thunder_ecam_bus_ops = {
+ .bus_shift = 20,
+ .ops = {
+ .map_bus = thunder_ecam_map_bus,
+ .read = thunder_ecam_config_read,
+ .write = thunder_ecam_config_write,
+ }
+};
+
+static const struct of_device_id thunder_ecam_of_match[] = {
+ { .compatible = "cavium,pci-host-thunder-ecam",
+ .data = &thunder_ecam_bus_ops },
+
+ { },
+};
+MODULE_DEVICE_TABLE(of, thunder_ecam_of_match);
+
+static int thunder_ecam_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct of_device_id *of_id;
+ struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
+
+ if (!pci)
+ return -ENOMEM;
+
+ of_id = of_match_node(thunder_ecam_of_match, dev->of_node);
+ pci->cfg.ops = (struct gen_pci_cfg_bus_ops *)of_id->data;
+
+ return pci_host_common_probe(pdev, pci);
+}
+
+static struct platform_driver thunder_ecam_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = thunder_ecam_of_match,
+ },
+ .probe = thunder_ecam_probe,
+};
+module_platform_driver(thunder_ecam_driver);
+
+MODULE_DESCRIPTION("Thunder ECAM PCI host driver");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 23:14:15 +0100