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authorKyösti Mälkki <kyosti.malkki@gmail.com>2018-12-26 19:33:28 +0200
committerKyösti Mälkki <kyosti.malkki@gmail.com>2018-12-30 21:33:26 +0000
commit3521e260e3477b3c49835eb2330671e0bc7abe65 (patch)
tree6b58e7e6268866396c3dd6932bf03e63319770c0 /src/device/pci_early.c
parentfb25f9fa05751163fef2a4dabea03f07f91fdbb0 (diff)
downloadcoreboot-3521e260e3477b3c49835eb2330671e0bc7abe65.tar.xz
device/pci_early: Fixes for __SIMPLE_DEVICE__
The feature is used to enable PCI MMIO accesses behind PCIe links (or bridges) before PCI enumeration has been completed. Add the feature for bootblock, verstage and postcar, it is required with add-on PCIe serial cards for early console output. It's up to the board specific code to configure PCIe root port prior to calling console_init() for this to work. Remove feature from ramstage, it bypasses any resource allocations and bus number assignments. For the moment PCI configuration support before ramstage is available only on ARCH_X86. Also switch from device_t to pci_devfn_t. Change-Id: I08acec68b6f17f4d73d30039cc41274492ea4f45 Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/c/30496 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Diffstat (limited to 'src/device/pci_early.c')
-rw-r--r--src/device/pci_early.c33
1 files changed, 18 insertions, 15 deletions
diff --git a/src/device/pci_early.c b/src/device/pci_early.c
index 6baebe0c28..4cf8c7e68c 100644
--- a/src/device/pci_early.c
+++ b/src/device/pci_early.c
@@ -20,7 +20,7 @@
#include <device/pci_def.h>
#include <delay.h>
-#ifdef __PRE_RAM__
+#if !ENV_RAMSTAGE
unsigned pci_find_next_capability(pci_devfn_t dev, unsigned cap, unsigned last)
{
unsigned pos = 0;
@@ -68,12 +68,11 @@ unsigned pci_find_capability(pci_devfn_t dev, unsigned cap)
{
return pci_find_next_capability(dev, cap, 0);
}
-#endif /* __PRE_RAM__ */
-
+#endif
#if IS_ENABLED(CONFIG_EARLY_PCI_BRIDGE)
-static void pci_bridge_reset_secondary(device_t p2p_bridge)
+static void pci_bridge_reset_secondary(pci_devfn_t p2p_bridge)
{
u16 reg16;
@@ -90,7 +89,7 @@ static void pci_bridge_reset_secondary(device_t p2p_bridge)
pci_write_config16(p2p_bridge, PCI_BRIDGE_CONTROL, reg16);
}
-static void pci_bridge_set_secondary(device_t p2p_bridge, u8 secondary)
+static void pci_bridge_set_secondary(pci_devfn_t p2p_bridge, u8 secondary)
{
/* Disable config transaction forwarding. */
pci_write_config8(p2p_bridge, PCI_SECONDARY_BUS, 0x00);
@@ -100,7 +99,7 @@ static void pci_bridge_set_secondary(device_t p2p_bridge, u8 secondary)
pci_write_config8(p2p_bridge, PCI_SUBORDINATE_BUS, secondary);
}
-static void pci_bridge_set_mmio(device_t p2p_bridge, u32 base, u32 size)
+static void pci_bridge_set_mmio(pci_devfn_t p2p_bridge, u32 base, u32 size)
{
u16 reg16;
@@ -122,27 +121,20 @@ static void pci_bridge_set_mmio(device_t p2p_bridge, u32 base, u32 size)
pci_write_config16(p2p_bridge, PCI_COMMAND, reg16);
}
-void pci_early_bridge_init(void)
+void pci_early_mmio_window(pci_devfn_t p2p_bridge, u32 mmio_base, u32 mmio_size)
{
int timeout, ret = -1;
- /* No PCI-to-PCI bridges are enabled yet, so the one we try to
- * configure must have its primary on bus 0.
- */
- pci_devfn_t p2p_bridge = PCI_DEV(0, CONFIG_EARLY_PCI_BRIDGE_DEVICE,
- CONFIG_EARLY_PCI_BRIDGE_FUNCTION);
-
/* Secondary bus number is mostly irrelevant as we disable
* configuration transactions right after the probe.
*/
u8 secondary = 15;
u8 dev = 0;
- u32 mmio_base = CONFIG_EARLY_PCI_MMIO_BASE;
/* Enable configuration and MMIO over bridge. */
pci_bridge_reset_secondary(p2p_bridge);
pci_bridge_set_secondary(p2p_bridge, secondary);
- pci_bridge_set_mmio(p2p_bridge, mmio_base, 0x4000);
+ pci_bridge_set_mmio(p2p_bridge, mmio_base, mmio_size);
for (timeout = 20000; timeout; timeout--) {
u32 id = pci_read_config32(PCI_DEV(secondary, dev, 0), PCI_VENDOR_ID);
@@ -164,4 +156,15 @@ void pci_early_bridge_init(void)
*/
pci_bridge_set_secondary(p2p_bridge, 0);
}
+
+void pci_early_bridge_init(void)
+{
+ /* No PCI-to-PCI bridges are enabled yet, so the one we try to
+ * configure must have its primary on bus 0.
+ */
+ pci_devfn_t p2p_bridge = PCI_DEV(0, CONFIG_EARLY_PCI_BRIDGE_DEVICE,
+ CONFIG_EARLY_PCI_BRIDGE_FUNCTION);
+
+ pci_early_mmio_window(p2p_bridge, CONFIG_EARLY_PCI_MMIO_BASE, 0x4000);
+}
#endif /* CONFIG_EARLY_PCI_BRIDGE */