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-rw-r--r--src/southbridge/intel/lynxpoint/pch.c4
-rw-r--r--src/southbridge/intel/lynxpoint/pch.h2
-rw-r--r--src/southbridge/intel/lynxpoint/pcie.c456
3 files changed, 318 insertions, 144 deletions
diff --git a/src/southbridge/intel/lynxpoint/pch.c b/src/southbridge/intel/lynxpoint/pch.c
index b4605f5c02..d073a4b9a7 100644
--- a/src/southbridge/intel/lynxpoint/pch.c
+++ b/src/southbridge/intel/lynxpoint/pch.c
@@ -293,9 +293,9 @@ void pch_enable(device_t dev)
{
u32 reg32;
- /* PCH PCIe Root Ports get special handling */
+ /* PCH PCIe Root Ports are handled in PCIe driver. */
if (PCI_SLOT(dev->path.pci.devfn) == PCH_PCIE_DEV_SLOT)
- return pch_pcie_enable_dev(dev);
+ return;
if (!dev->enabled) {
printk(BIOS_DEBUG, "%s: Disabling device\n", dev_path(dev));
diff --git a/src/southbridge/intel/lynxpoint/pch.h b/src/southbridge/intel/lynxpoint/pch.h
index 9acdd1f79c..d1fbbe75bd 100644
--- a/src/southbridge/intel/lynxpoint/pch.h
+++ b/src/southbridge/intel/lynxpoint/pch.h
@@ -166,7 +166,6 @@ void pch_disable_devfn(device_t dev);
u32 pch_iobp_read(u32 address);
void pch_iobp_write(u32 address, u32 data);
void pch_iobp_update(u32 address, u32 andvalue, u32 orvalue);
-void pch_pcie_enable_dev(device_t dev);
#if CONFIG_ELOG
void pch_log_state(void);
#endif
@@ -493,6 +492,7 @@ void set_gpio(int gpio_num, int value);
#define RP6D 0x0180 /* 32bit */
#define RP6BA 0x0188 /* 64bit */
+#define RPC 0x0400 /* 32bit */
#define RPFN 0x0404 /* 32bit */
/* Root Port configuratinon space hide */
diff --git a/src/southbridge/intel/lynxpoint/pcie.c b/src/southbridge/intel/lynxpoint/pcie.c
index 28f4b6ad15..98dfe6170e 100644
--- a/src/southbridge/intel/lynxpoint/pcie.c
+++ b/src/southbridge/intel/lynxpoint/pcie.c
@@ -25,188 +25,343 @@
#include <device/pci_ids.h>
#include "pch.h"
-/* Check if any port in set X to X+3 is enabled */
-static int pch_pcie_check_set_enabled(device_t dev)
+/* LynxPoint-LP has 6 root ports while non-LP has 8. */
+#define MAX_NUM_ROOT_PORTS 8
+#define H_NUM_ROOT_PORTS MAX_NUM_ROOT_PORTS
+#define LP_NUM_ROOT_PORTS (MAX_NUM_ROOT_PORTS - 2)
+
+struct root_port_config {
+ /* RPFN is a write-once register so keep a copy until it is written */
+ u32 orig_rpfn;
+ u32 new_rpfn;
+ u32 pin_ownership;
+ u32 strpfusecfg1;
+ u32 strpfusecfg2;
+ u32 strpfusecfg3;
+ int coalesce;
+ int gbe_port;
+ int num_ports;
+ device_t ports[MAX_NUM_ROOT_PORTS];
+};
+
+static struct root_port_config rpc;
+
+static inline int max_root_ports(void)
{
- device_t port;
- int port_func;
- int dev_func = PCI_FUNC(dev->path.pci.devfn);
-
- printk(BIOS_DEBUG, "%s: check set enabled\n", dev_path(dev));
-
- /* Go through static device tree list of devices
- * because enumeration is still in progress */
- for (port = all_devices; port; port = port->next) {
- /* Only care about PCIe root ports */
- if (PCI_SLOT(port->path.pci.devfn) !=
- PCI_SLOT(dev->path.pci.devfn))
- continue;
+ if (pch_is_lp())
+ return LP_NUM_ROOT_PORTS;
+ else
+ return H_NUM_ROOT_PORTS;
+}
- /* Check if port is in range and enabled */
- port_func = PCI_FUNC(port->path.pci.devfn);
- if (port_func >= dev_func &&
- port_func < (dev_func + 4) &&
- port->enabled)
- return 1;
- }
+static inline int root_port_is_first(device_t dev)
+{
+ return PCI_FUNC(dev->path.pci.devfn) == 0;
+}
+
+static inline int root_port_is_last(device_t dev)
+{
+ return PCI_FUNC(dev->path.pci.devfn) == (rpc.num_ports - 1);
+}
- /* None of the ports in this set are enabled */
- return 0;
+/* Root ports are numbered 1..N in the documentation. */
+static inline int root_port_number(device_t dev)
+{
+ return PCI_FUNC(dev->path.pci.devfn) + 1;
}
-/* RPFN is a write-once register so keep a copy until it is written */
-static u32 new_rpfn;
+static void root_port_config_update_gbe_port(void)
+{
+ /* Is the Gbe Port enabled? */
+ if (!((rpc.strpfusecfg1 >> 19) & 1))
+ return;
+
+ if (pch_is_lp()) {
+ switch ((rpc.strpfusecfg1 >> 16) & 0x7) {
+ case 0:
+ rpc.gbe_port = 3;
+ break;
+ case 1:
+ rpc.gbe_port = 4;
+ break;
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ /* Lanes 0-4 of Root Port 5. */
+ rpc.gbe_port = 5;
+ break;
+ default:
+ printk(BIOS_DEBUG, "Invalid GbE Port Selection.\n");
+ }
+ } else {
+ /* Non-LP has 1:1 mapping with root ports. */
+ rpc.gbe_port = ((rpc.strpfusecfg1 >> 16) & 0x7) + 1;
+ }
+}
-/* Swap function numbers assigned to two PCIe Root Ports */
-static void pch_pcie_function_swap(u8 old_fn, u8 new_fn)
+static void root_port_init_config(device_t dev)
{
- u32 old_rpfn = new_rpfn;
+ int rp;
- printk(BIOS_DEBUG, "PCH: Remap PCIe function %d to %d\n",
- old_fn, new_fn);
+ if (root_port_is_first(dev)) {
+ rpc.orig_rpfn = RCBA32(RPFN);
+ rpc.new_rpfn = rpc.orig_rpfn;
+ rpc.num_ports = max_root_ports();
+ rpc.gbe_port = -1;
- new_rpfn &= ~(RPFN_FNMASK(old_fn) | RPFN_FNMASK(new_fn));
+ rpc.pin_ownership = pci_read_config32(dev, 0x410);
+ root_port_config_update_gbe_port();
- /* Old function set to new function and disabled */
- new_rpfn |= RPFN_FNSET(old_fn, RPFN_FNGET(old_rpfn, new_fn));
- new_rpfn |= RPFN_FNSET(new_fn, RPFN_FNGET(old_rpfn, old_fn));
+ if (dev->chip_info != NULL) {
+ struct southbridge_intel_lynxpoint_config *config;
+
+ config = dev->chip_info;
+ rpc.coalesce = config->pcie_port_coalesce;
+ }
+ }
+
+ rp = root_port_number(dev);
+ if (rp > rpc.num_ports) {
+ printk(BIOS_ERR, "Found Root Port %d, expecting %d\n",
+ rp, rpc.num_ports);
+ return;
+ }
+
+ /* Read the fuse configuration and pin ownership. */
+ switch (rp) {
+ case 1:
+ rpc.strpfusecfg1 = pci_read_config32(dev, 0xfc);
+ break;
+ case 5:
+ rpc.strpfusecfg2 = pci_read_config32(dev, 0xfc);
+ break;
+ case 6:
+ rpc.strpfusecfg3 = pci_read_config32(dev, 0xfc);
+ break;
+ default:
+ break;
+ }
+
+ /* Cache pci device. */
+ rpc.ports[rp - 1] = dev;
}
/* Update devicetree with new Root Port function number assignment */
-static void pch_pcie_devicetree_update(void)
+static void pch_pcie_device_set_func(int index, int pci_func)
{
device_t dev;
+ unsigned new_devfn;
- /* Update the function numbers in the static devicetree */
- for (dev = all_devices; dev; dev = dev->next) {
- u8 new_devfn;
+ dev = rpc.ports[index];
- /* Only care about PCH PCIe root ports */
- if (PCI_SLOT(dev->path.pci.devfn) !=
- PCH_PCIE_DEV_SLOT)
- continue;
+ /* Set the new PCI function field for this Root Port. */
+ rpc.new_rpfn &= ~RPFN_FNMASK(index);
+ rpc.new_rpfn |= RPFN_FNSET(index, pci_func);
- /* Determine the new devfn for this port */
- new_devfn = PCI_DEVFN(PCH_PCIE_DEV_SLOT,
- RPFN_FNGET(new_rpfn,
- PCI_FUNC(dev->path.pci.devfn)));
+ /* Determine the new devfn for this port */
+ new_devfn = PCI_DEVFN(PCH_PCIE_DEV_SLOT, pci_func);
- if (dev->path.pci.devfn != new_devfn) {
- printk(BIOS_DEBUG,
- "PCH: PCIe map %02x.%1x -> %02x.%1x\n",
- PCI_SLOT(dev->path.pci.devfn),
- PCI_FUNC(dev->path.pci.devfn),
- PCI_SLOT(new_devfn), PCI_FUNC(new_devfn));
+ if (dev->path.pci.devfn != new_devfn) {
+ printk(BIOS_DEBUG,
+ "PCH: PCIe map %02x.%1x -> %02x.%1x\n",
+ PCI_SLOT(dev->path.pci.devfn),
+ PCI_FUNC(dev->path.pci.devfn),
+ PCI_SLOT(new_devfn), PCI_FUNC(new_devfn));
- dev->path.pci.devfn = new_devfn;
- }
+ dev->path.pci.devfn = new_devfn;
}
}
-/* Special handling for PCIe Root Port devices */
-void pch_pcie_enable_dev(device_t dev)
+static void root_port_commit_config(void)
{
- struct southbridge_intel_lynxpoint_config *config = dev->chip_info;
- u32 reg32;
+ int i;
- /*
- * Save a copy of the Root Port Function Number map when
- * starting to walk the list of PCIe Root Ports so it can
- * be updated locally and written out when the last port
- * has been processed.
- */
- if (PCI_FUNC(dev->path.pci.devfn) == 0) {
- new_rpfn = RCBA32(RPFN);
-
- /*
- * Enable Root Port coalescing if the first port is disabled
- * or the other devices will not be enumerated by the OS.
- */
- if (!dev->enabled)
- config->pcie_port_coalesce = 1;
-
- if (config->pcie_port_coalesce)
- printk(BIOS_INFO,
- "PCH: PCIe Root Port coalescing is enabled\n");
- }
+ /* If the first root port is disabled the coalesce ports. */
+ if (!rpc.ports[0]->enabled)
+ rpc.coalesce = 1;
- if (!dev->enabled) {
- printk(BIOS_DEBUG, "%s: Disabling device\n", dev_path(dev));
+ for (i = 0; i < rpc.num_ports; i++) {
+ device_t dev;
+ u32 reg32;
- /*
- * PCIE Power Savings for PantherPoint and CougarPoint/B1+
- *
- * If PCIe 0-3 disabled set Function 0 0xE2[0] = 1
- * If PCIe 4-7 disabled set Function 4 0xE2[0] = 1
- *
- * This check is done here instead of pcie driver
- * because the pcie driver enable() handler is not
- * called unless the device is enabled.
- */
- if ((PCI_FUNC(dev->path.pci.devfn) == 0 ||
- PCI_FUNC(dev->path.pci.devfn) == 4)) {
- /* Handle workaround for PPT and CPT/B1+ */
- if (!pch_pcie_check_set_enabled(dev)) {
- u8 reg8 = pci_read_config8(dev, 0xe2);
- reg8 |= 1;
- pci_write_config8(dev, 0xe2, reg8);
- }
+ dev = rpc.ports[i];
- /*
- * Enable Clock Gating for shared PCIe resources
- * before disabling this particular port.
- */
- pci_write_config8(dev, 0xe1, 0x3c);
+ if (dev == NULL) {
+ printk(BIOS_ERR, "Root Port %d device is NULL?\n", i+1);
+ continue;
}
+ if (dev->enabled)
+ continue;
+
+ printk(BIOS_DEBUG, "%s: Disabling device\n", dev_path(dev));
+
/* Ensure memory, io, and bus master are all disabled */
reg32 = pci_read_config32(dev, PCI_COMMAND);
reg32 &= ~(PCI_COMMAND_MASTER |
PCI_COMMAND_MEMORY | PCI_COMMAND_IO);
pci_write_config32(dev, PCI_COMMAND, reg32);
- /* Do not claim downstream transactions for PCIe ports */
- new_rpfn |= RPFN_HIDE(PCI_FUNC(dev->path.pci.devfn));
-
/* Disable this device if possible */
pch_disable_devfn(dev);
- } else {
- int fn;
-
- /*
- * Check if there is a lower disabled port to swap with this
- * port in order to maintain linear order starting at zero.
- */
- if (config->pcie_port_coalesce) {
- for (fn=0; fn < PCI_FUNC(dev->path.pci.devfn); fn++) {
- if (!(new_rpfn & RPFN_HIDE(fn)))
- continue;
-
- /* Swap places with this function */
- pch_pcie_function_swap(
- PCI_FUNC(dev->path.pci.devfn), fn);
- break;
- }
+ }
+
+ if (rpc.coalesce) {
+ int current_func;
+
+ /* For all Root Ports N enabled ports get assigned the lower
+ * PCI function number. The disabled ones get upper PCI
+ * function numbers. */
+ current_func = 0;
+ for (i = 0; i < rpc.num_ports; i++) {
+ if (!rpc.ports[i]->enabled)
+ continue;
+ pch_pcie_device_set_func(i, current_func);
+ current_func++;
}
- /* Enable SERR */
- reg32 = pci_read_config32(dev, PCI_COMMAND);
- reg32 |= PCI_COMMAND_SERR;
- pci_write_config32(dev, PCI_COMMAND, reg32);
+ /* Allocate the disabled devices' PCI function number. */
+ for (i = 0; i < rpc.num_ports; i++) {
+ if (rpc.ports[i]->enabled)
+ continue;
+ pch_pcie_device_set_func(i, current_func);
+ current_func++;
+ }
}
- /*
- * When processing the last PCIe root port we can now
- * update the Root Port Function Number and Hide register.
- */
- if (PCI_FUNC(dev->path.pci.devfn) == 7) {
- printk(BIOS_SPEW, "PCH: RPFN 0x%08x -> 0x%08x\n",
- RCBA32(RPFN), new_rpfn);
- RCBA32(RPFN) = new_rpfn;
-
- /* Update static devictree with new function numbers */
- if (config->pcie_port_coalesce)
- pch_pcie_devicetree_update();
+ printk(BIOS_SPEW, "PCH: RPFN 0x%08x -> 0x%08x\n",
+ rpc.orig_rpfn, rpc.new_rpfn);
+ RCBA32(RPFN) = rpc.new_rpfn;
+}
+
+static void root_port_mark_disable(device_t dev)
+{
+ /* Mark device as disabled. */
+ dev->enabled = 0;
+ /* Mark device to be hidden. */
+ rpc.new_rpfn |= RPFN_HIDE(PCI_FUNC(dev->path.pci.devfn));
+}
+
+static void root_port_check_disable(device_t dev)
+{
+ int rp;
+ int is_lp;
+
+ /* Device already disabled. */
+ if (!dev->enabled) {
+ root_port_mark_disable(dev);
+ return;
+ }
+
+ rp = root_port_number(dev);
+
+ /* Is the GbE port mapped to this Root Port? */
+ if (rp == rpc.gbe_port) {
+ root_port_mark_disable(dev);
+ return;
+ }
+
+ is_lp = pch_is_lp();
+
+ /* Check Root Port Configuration. */
+ switch (rp) {
+ case 2:
+ /* Root Port 2 is disabled for all lane configurations
+ * but config 00b (4x1 links). */
+ if ((rpc.strpfusecfg1 >> 14) & 0x3) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ case 3:
+ /* Root Port 3 is disabled in config 11b (1x4 links). */
+ if (((rpc.strpfusecfg1 >> 14) & 0x3) == 0x3) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ case 4:
+ /* Root Port 4 is disabled in configs 11b (1x4 links)
+ * and 10b (2x2 links). */
+ if ((rpc.strpfusecfg1 >> 14) & 0x2) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ case 6:
+ if (is_lp)
+ break;
+ /* Root Port 6 is disabled for all lane configurations
+ * but config 00b (4x1 links). */
+ if ((rpc.strpfusecfg2 >> 14) & 0x3) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ case 7:
+ if (is_lp)
+ break;
+ /* Root Port 3 is disabled in config 11b (1x4 links). */
+ if (((rpc.strpfusecfg2 >> 14) & 0x3) == 0x3) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ case 8:
+ if (is_lp)
+ break;
+ /* Root Port 8 is disabled in configs 11b (1x4 links)
+ * and 10b (2x2 links). */
+ if ((rpc.strpfusecfg2 >> 14) & 0x2) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ }
+
+ /* Check Pin Ownership. */
+ if (is_lp) {
+ switch (rp) {
+ case 1:
+ /* Bit 0 is Root Port 1 ownership. */
+ if ((rpc.pin_ownership & 0x1) == 0) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ case 2:
+ /* Bit 2 is Root Port 2 ownership. */
+ if ((rpc.pin_ownership & 0x4) == 0) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ case 6:
+ /* Bits 7:4 are Root Port 6 pin-lane ownership. */
+ if ((rpc.pin_ownership & 0xf0) == 0) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ }
+ } else {
+ switch (rp) {
+ case 1:
+ /* Bits 4 and 0 are Root Port 1 ownership. */
+ if ((rpc.pin_ownership & 0x11) == 0) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ case 2:
+ /* Bits 5 and 2 are Root Port 2 ownership. */
+ if ((rpc.pin_ownership & 0x24) == 0) {
+ root_port_mark_disable(dev);
+ return;
+ }
+ break;
+ }
}
}
@@ -374,6 +529,11 @@ static void pci_init(struct device *dev)
printk(BIOS_DEBUG, "Initializing PCH PCIe bridge.\n");
+ /* Enable SERR */
+ reg32 = pci_read_config32(dev, PCI_COMMAND);
+ reg32 |= PCI_COMMAND_SERR;
+ pci_write_config32(dev, PCI_COMMAND, reg32);
+
/* Enable Bus Master */
reg32 = pci_read_config32(dev, PCI_COMMAND);
reg32 |= PCI_COMMAND_MASTER;
@@ -415,8 +575,22 @@ static void pci_init(struct device *dev)
static void pch_pcie_enable(device_t dev)
{
+ /* Add this device to the root port config structure. */
+ root_port_init_config(dev);
+
+ /* Check to see if this Root Port should be disabled. */
+ root_port_check_disable(dev);
+
/* Power Management init before enumeration */
- pch_pcie_pm_early(dev);
+ if (dev->enabled)
+ pch_pcie_pm_early(dev);
+
+ /*
+ * When processing the last PCIe root port we can now
+ * update the Root Port Function Number and Hide register.
+ */
+ if (root_port_is_last(dev))
+ root_port_commit_config();
}
static void pcie_set_subsystem(device_t dev, unsigned vendor, unsigned device)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 21:59:47 +0000