Makes dm_pci_map_bar API available for integrated PCI devices that support Enhanced Allocation instead of the original PCI BAR mechanism.
Signed-off-by: Alex Marginean alexm.osslist@gmail.com ---
Changes in v2: - fixed parsing for BAR1+ - fixed an issue with EA entry size - don't look up EA capability structure twice - use phys_addr_t for EA addresses - use kernel MACROS for EA registers
drivers/pci/pci-uclass.c | 46 ++++++++++++++++++++++++++++++++++++++++ include/pci.h | 13 ++++++++++++ 2 files changed, 59 insertions(+)
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c index cf1e7617ae..389aec15ce 100644 --- a/drivers/pci/pci-uclass.c +++ b/drivers/pci/pci-uclass.c @@ -1341,10 +1341,56 @@ pci_addr_t dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t phys_addr, return bus_addr; }
+static void *dm_pci_map_ea_bar(struct udevice *dev, int bar, int flags, + int ea_off) +{ + int ea_cnt, i, entry_size; + int bar_id = (bar - PCI_BASE_ADDRESS_0) >> 2; + u32 ea_entry; + phys_addr_t addr; + + /* EA capability structure header */ + dm_pci_read_config32(dev, ea_off, &ea_entry); + ea_cnt = (ea_entry >> 16) & PCI_EA_NUM_ENT_MASK; + ea_off += PCI_EA_FIRST_ENT; + + for (i = 0; i < ea_cnt; i++, ea_off += entry_size) { + /* Entry header */ + dm_pci_read_config32(dev, ea_off, &ea_entry); + entry_size = ((ea_entry & PCI_EA_ES) + 1) << 2; + + if (((ea_entry & PCI_EA_BEI) >> 4) != bar_id) + continue; + + /* Base address, 1st DW */ + dm_pci_read_config32(dev, ea_off + 4, &ea_entry); + addr = ea_entry & PCI_EA_FIELD_MASK; + if (ea_entry & PCI_EA_IS_64) { + /* Base address, 2nd DW, skip over 4B MaxOffset */ + dm_pci_read_config32(dev, ea_off + 12, &ea_entry); + addr |= ((u64)ea_entry) << 32; + } + + /* size ignored for now */ + return map_physmem(addr, flags, 0); + } + + return 0; +} + void *dm_pci_map_bar(struct udevice *dev, int bar, int flags) { pci_addr_t pci_bus_addr; u32 bar_response; + int ea_off; + + /* + * if the function supports Enhanced Allocation use that instead of + * BARs + */ + ea_off = dm_pci_find_capability(dev, PCI_CAP_ID_EA); + if (ea_off) + return dm_pci_map_ea_bar(dev, bar, flags, ea_off);
/* read BAR address */ dm_pci_read_config32(dev, bar, &bar_response); diff --git a/include/pci.h b/include/pci.h index 40c7751acf..0aab438159 100644 --- a/include/pci.h +++ b/include/pci.h @@ -455,6 +455,17 @@ #define PCI_EXT_CAP_ID_PTM 0x1F /* Precision Time Measurement */ #define PCI_EXT_CAP_ID_MAX PCI_EXT_CAP_ID_PTM
+/* Enhanced Allocation Registers */ +#define PCI_EA_NUM_ENT 2 /* Number of Capability Entries */ +#define PCI_EA_NUM_ENT_MASK 0x3f /* Num Entries Mask */ +#define PCI_EA_FIRST_ENT 4 /* First EA Entry in List */ +#define PCI_EA_ES 0x00000007 /* Entry Size */ +#define PCI_EA_BEI 0x000000f0 /* BAR Equivalent Indicator */ +/* Base, MaxOffset registers */ +/* bit 0 is reserved */ +#define PCI_EA_IS_64 0x00000002 /* 64-bit field flag */ +#define PCI_EA_FIELD_MASK 0xfffffffc /* For Base & Max Offset */ + /* Include the ID list */
#include <pci_ids.h> @@ -1312,6 +1323,8 @@ pci_addr_t dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t addr, * that corresponds to it. * Can be used for 32b BARs 0-5 on type 0 functions and for 32b BARs 0-1 on * type 1 functions. + * Can also be used on type 0 functions that support Enhanced Allocation for + * 32b/64b BARs. Note that duplicate BEI entries are not supported. * * @dev: Device to check * @bar: Bar register offset (PCI_BASE_ADDRESS_...)