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 
arch_sync_dma_for_cpu_all(void)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 }
23