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 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