From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/mips/loongson2ef/common/pci.c | 87 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 arch/mips/loongson2ef/common/pci.c (limited to 'arch/mips/loongson2ef/common/pci.c') diff --git a/arch/mips/loongson2ef/common/pci.c b/arch/mips/loongson2ef/common/pci.c new file mode 100644 index 000000000..7d9ea51e8 --- /dev/null +++ b/arch/mips/loongson2ef/common/pci.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology + * Author: Fuxin Zhang, zhangfx@lemote.com + */ +#include + +#include +#include + +static struct resource loongson_pci_mem_resource = { + .name = "pci memory space", + .start = LOONGSON_PCI_MEM_START, + .end = LOONGSON_PCI_MEM_END, + .flags = IORESOURCE_MEM, +}; + +static struct resource loongson_pci_io_resource = { + .name = "pci io space", + .start = LOONGSON_PCI_IO_START, + .end = IO_SPACE_LIMIT, + .flags = IORESOURCE_IO, +}; + +static struct pci_controller loongson_pci_controller = { + .pci_ops = &loongson_pci_ops, + .io_resource = &loongson_pci_io_resource, + .mem_resource = &loongson_pci_mem_resource, + .mem_offset = 0x00000000UL, + .io_offset = 0x00000000UL, +}; + +static void __init setup_pcimap(void) +{ + /* + * local to PCI mapping for CPU accessing PCI space + * CPU address space [256M,448M] is window for accessing pci space + * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M] + * + * pcimap: PCI_MAP2 PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0 + * [<2G] [384M,448M] [320M,384M] [0M,64M] + */ + LOONGSON_PCIMAP = LOONGSON_PCIMAP_PCIMAP_2 | + LOONGSON_PCIMAP_WIN(2, LOONGSON_PCILO2_BASE) | + LOONGSON_PCIMAP_WIN(1, LOONGSON_PCILO1_BASE) | + LOONGSON_PCIMAP_WIN(0, 0); + + /* + * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M] + */ + LOONGSON_PCIBASE0 = 0x80000000ul; /* base: 2G -> mmap: 0M */ + /* size: 256M, burst transmission, pre-fetch enable, 64bit */ + LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul; + LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful; + LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */ + LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul; + LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */ + LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul; + + /* avoid deadlock of PCI reading/writing lock operation */ + LOONGSON_PCI_ISR4C = 0xd2000001ul; + + /* can not change gnt to break pci transfer when device's gnt not + deassert for some broken device */ + LOONGSON_PXARB_CFG = 0x00fe0105ul; + +#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG + /* + * set cpu addr window2 to map CPU address space to PCI address space + */ + LOONGSON_ADDRWIN_CPUTOPCI(ADDRWIN_WIN2, LOONGSON_CPU_MEM_SRC, + LOONGSON_PCI_MEM_DST, MMAP_CPUTOPCI_SIZE); +#endif +} + +static int __init pcibios_init(void) +{ + setup_pcimap(); + + loongson_pci_controller.io_map_base = mips_io_port_base; + register_pci_controller(&loongson_pci_controller); + + + return 0; +} + +arch_initcall(pcibios_init); -- cgit v1.2.3