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From 3e4c3863e0cfb8c2abdff6bb494ca69d3d2aed9c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
Date: Sat, 10 Jun 2023 17:01:40 +0200
Subject: [PATCH] mips: bmips: dma: fix CBR address
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Some BCM63xx SoCs may return CBR address as 0.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
arch/mips/bmips/dma.c | 12 ++++--------
arch/mips/bmips/setup.c | 11 ++++-------
2 files changed, 8 insertions(+), 15 deletions(-)
--- a/arch/mips/bmips/dma.c
+++ b/arch/mips/bmips/dma.c
@@ -64,11 +64,10 @@ phys_addr_t dma_to_phys(struct device *d
return dma_addr;
}
-bool bmips_rac_flush_disable;
+void __iomem *bmips_cbr_addr;
void arch_sync_dma_for_cpu_all(void)
{
- void __iomem *cbr = BMIPS_GET_CBR();
u32 cfg;
if (boot_cpu_type() != CPU_BMIPS3300 &&
@@ -76,13 +75,10 @@ void arch_sync_dma_for_cpu_all(void)
boot_cpu_type() != CPU_BMIPS4380)
return;
- if (unlikely(bmips_rac_flush_disable))
- return;
-
/* Flush stale data out of the readahead cache */
- cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
- __raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
- __raw_readl(cbr + BMIPS_RAC_CONFIG);
+ cfg = __raw_readl(bmips_cbr_addr + BMIPS_RAC_CONFIG);
+ __raw_writel(cfg | 0x100, bmips_cbr_addr + BMIPS_RAC_CONFIG);
+ __raw_readl(bmips_cbr_addr + BMIPS_RAC_CONFIG);
}
static int __init bmips_init_dma_ranges(void)
--- a/arch/mips/bmips/setup.c
+++ b/arch/mips/bmips/setup.c
@@ -89,7 +89,7 @@
#define DDR_CSEND_REG 0x8
-extern bool bmips_rac_flush_disable;
+extern void __iomem *bmips_cbr_addr;
static const unsigned long kbase = VMLINUX_LOAD_ADDRESS & 0xfff00000;
@@ -170,12 +170,6 @@ static void bcm6358_quirks(void)
* disable SMP for now
*/
bmips_smp_enabled = 0;
-
- /*
- * RAC flush causes kernel panics on BCM6358 when booting from TP1
- * because the bootloader is not initializing it properly.
- */
- bmips_rac_flush_disable = !!(read_c0_brcm_cmt_local() & (1 << 31));
}
static void bcm6368_quirks(void)
@@ -198,6 +192,11 @@ static const struct bmips_quirk bmips_qu
void __init prom_init(void)
{
+ if (!(read_c0_brcm_cbr() >> 18))
+ bmips_cbr_addr = (void __iomem *)0xff400000;
+ else
+ bmips_cbr_addr = BMIPS_GET_CBR();
+
bmips_cpu_setup();
register_bmips_smp_ops();
}
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