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MIPS: Loongson64: Enable DMA noncoherent support

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commit edc0378eee00200a5bedf1bb9f00ad390e0d1bd4 upstream.

There are some Loongson64 systems come with broken coherent DMA
support, firmware will set a bit in boot_param and pass nocoherentio
in cmdline.

However nonconherent support was missed out when spin off Loongson-2EF
form Loongson64, and that boot_param change never made itself into
upstream.

Support DMA noncoherent properly to get those systems working.

Cc: stable@vger.kernel.org
Fixes: 71e2f4dd5a65 ("MIPS: Fork loongson2ef from loongson64")
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiaxun Yang 2023-11-07 11:15:19 +00:00 • committed by Ksawlii
parent 1e2ffe3005
commit 191edae40a
3 changed files with 13 additions and 2 deletions
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2
arch/mips/Kconfig
View file

@ -468,6 +468,7 @@ config MACH_LOONGSON2EF
config MACH_LOONGSON64
bool "Loongson 64-bit family of machines"
select ARCH_DMA_DEFAULT_COHERENT
select ARCH_SPARSEMEM_ENABLE
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
@ -1379,6 +1380,7 @@ config CPU_LOONGSON64
select CPU_SUPPORTS_MSA
select CPU_DIEI_BROKEN if !LOONGSON3_ENHANCEMENT
select CPU_MIPSR2_IRQ_VI
select DMA_NONCOHERENT
select WEAK_ORDERING
select WEAK_REORDERING_BEYOND_LLSC
select MIPS_ASID_BITS_VARIABLE

3
arch/mips/include/asm/mach-loongson64/boot_param.h
View file

@ -117,7 +117,8 @@ struct irq_source_routing_table {
u64 pci_io_start_addr;
u64 pci_io_end_addr;
u64 pci_config_addr;
u32 dma_mask_bits;
u16 dma_mask_bits;
u16 dma_noncoherent;
} __packed;
struct interface_info {

10
arch/mips/loongson64/env.c
View file

@ -13,6 +13,8 @@
* Copyright (C) 2009 Lemote Inc.
* Author: Wu Zhangjin, wuzhangjin@gmail.com
*/
#include <linux/dma-map-ops.h>
#include <linux/export.h>
#include <linux/pci_ids.h>
#include <asm/bootinfo.h>
@ -131,8 +133,14 @@ void __init prom_init_env(void)
loongson_sysconf.pci_io_base = eirq_source->pci_io_start_addr;
loongson_sysconf.dma_mask_bits = eirq_source->dma_mask_bits;
if (loongson_sysconf.dma_mask_bits < 32 ||
loongson_sysconf.dma_mask_bits > 64)
loongson_sysconf.dma_mask_bits > 64) {
loongson_sysconf.dma_mask_bits = 32;
dma_default_coherent = true;
} else {
dma_default_coherent = !eirq_source->dma_noncoherent;
}
pr_info("Firmware: Coherent DMA: %s\n", dma_default_coherent ? "on" : "off");
loongson_sysconf.restart_addr = boot_p->reset_system.ResetWarm;
loongson_sysconf.poweroff_addr = boot_p->reset_system.Shutdown;