xref: /openbmc/linux/arch/mips/bmips/dma.c (revision ab327f8a)
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 bool bmips_rac_flush_disable;
9 
arch_sync_dma_for_cpu_all(void)10 void arch_sync_dma_for_cpu_all(void)
11 {
12 	void __iomem *cbr = BMIPS_GET_CBR();
13 	u32 cfg;
14 
15 	if (boot_cpu_type() != CPU_BMIPS3300 &&
16 	    boot_cpu_type() != CPU_BMIPS4350 &&
17 	    boot_cpu_type() != CPU_BMIPS4380)
18 		return;
19 
20 	if (unlikely(bmips_rac_flush_disable))
21 		return;
22 
23 	/* Flush stale data out of the readahead cache */
24 	cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
25 	__raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
26 	__raw_readl(cbr + BMIPS_RAC_CONFIG);
27 }
28