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 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 }