From a45343a0aa3a01c02822fd1a2ddb2160b0943920 Mon Sep 17 00:00:00 2001 From: Daniel Schwierzeck Date: Thu, 15 Jul 2021 20:53:56 +0200 Subject: [PATCH] dm: pci: add option to map virtual system memory base address On MIPS the DRAM start address respectively CONFIG_SYS_SDRAM_BASE is still used as a virtual, CPU-mapped address instead of being used as physical address. Converting all MIPS boards and generic MIPS code to fix that is not trivial. Due to the approaching deadline for PCI DM conversion, this workaround is required for MIPS boards with PCI support until the CONFIG_SYS_SDRAM_BASE issue could be solved. Add a compile-time option to let the PCI uclass core optionally map the DRAM address to a physical address when adding the PCI region of type PCI_REGION_SYS_MEMORY. Signed-off-by: Daniel Schwierzeck Reviewed-by: Stefan Roese --- drivers/pci/Kconfig | 13 +++++++++++++ drivers/pci/pci-uclass.c | 9 ++++++--- 2 files changed, 19 insertions(+), 3 deletions(-) diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 517cf956ea..c49cb6eac9 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -54,6 +54,19 @@ config PCI_REGION_MULTI_ENTRY region type. This helps to add support for SoC's like OcteonTX/TX2 where every peripheral is on the PCI bus. +config PCI_MAP_SYSTEM_MEMORY + bool "Map local system memory from a virtual base address" + depends on PCI || DM_PCI + depends on MIPS + default n + help + Say Y if base address of system memory is being used as a virtual address + instead of a physical address (e.g. on MIPS). The PCI core will then remap + the virtual memory base address to a physical address when adding the PCI + region of type PCI_REGION_SYS_MEMORY. + This should only be required on MIPS where CONFIG_SYS_SDRAM_BASE is still + being used as virtual address. + config PCI_SRIOV bool "Enable Single Root I/O Virtualization support for PCI" depends on PCI || DM_PCI diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c index fb12732926..ce2eb5da2c 100644 --- a/drivers/pci/pci-uclass.c +++ b/drivers/pci/pci-uclass.c @@ -1034,10 +1034,13 @@ static void decode_regions(struct pci_controller *hose, ofnode parent_node, for (i = 0; i < CONFIG_NR_DRAM_BANKS; ++i) { if (bd->bi_dram[i].size) { + phys_addr_t start = bd->bi_dram[i].start; + + if (IS_ENABLED(CONFIG_PCI_MAP_SYSTEM_MEMORY)) + start = virt_to_phys((void *)(uintptr_t)bd->bi_dram[i].start); + pci_set_region(hose->regions + hose->region_count++, - bd->bi_dram[i].start, - bd->bi_dram[i].start, - bd->bi_dram[i].size, + start, start, bd->bi_dram[i].size, PCI_REGION_MEM | PCI_REGION_SYS_MEMORY); } } -- 2.39.5