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[linux.git] / arch / mips / bmips / dma.c
1 // SPDX-License-Identifier: GPL-2.0+
2
3 #include <linux/types.h>
4 #include <linux/dma-map-ops.h>
5 #include <asm/bmips.h>
6 #include <asm/io.h>
7
8 void arch_sync_dma_for_cpu_all(void)
9 {
10         void __iomem *cbr = BMIPS_GET_CBR();
11         u32 cfg;
12
13         if (boot_cpu_type() != CPU_BMIPS3300 &&
14             boot_cpu_type() != CPU_BMIPS4350 &&
15             boot_cpu_type() != CPU_BMIPS4380)
16                 return;
17
18         /* Flush stale data out of the readahead cache */
19         cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
20         __raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
21         __raw_readl(cbr + BMIPS_RAC_CONFIG);
22 }
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