MIPS: Pistachio: Remove plat_setup_iocoherency

The Pistachio SoC does not have an IOCU.  Hence, DMA is non-coherent.

Remove the function checking for iocoherency and select
CONFIG_DMA_NONCOHERENT in Kconfig

This code is probably accidentally inherited from Malta.

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Reviewed-by: James Hartley <james.hartley@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13433/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4ba1447d738151d1cc42384848450516079a7268..286893da4855feea67e8aea7d07d90ca581bcf6b 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -384,7 +384,7 @@ config MACH_PISTACHIO
        select CLKSRC_MIPS_GIC
        select COMMON_CLK
        select CSRC_R4K
-       select DMA_MAYBE_COHERENT
+       select DMA_NONCOHERENT
        select GPIOLIB
        select IRQ_MIPS_CPU
        select LIBFDT

diff --git a/arch/mips/pistachio/init.c b/arch/mips/pistachio/init.c
index ab79828230ab3e53fc0e2b25e6d33d81eacd9f91..387b9df1bc7cbfb64ddb2bf1ed722112edc4902c 100644 (file)
--- a/arch/mips/pistachio/init.c
+++ b/arch/mips/pistachio/init.c
@@ -60,29 +60,6 @@ const char *get_system_type(void)
        return sys_type;
 }
 
-static void __init plat_setup_iocoherency(void)
-{
-       /*
-        * Kernel has been configured with software coherency
-        * but we might choose to turn it off and use hardware
-        * coherency instead.
-        */
-       if (mips_cm_numiocu() != 0) {
-               /* Nothing special needs to be done to enable coherency */
-               pr_info("CMP IOCU detected\n");
-               hw_coherentio = 1;
-               if (coherentio == 0)
-                       pr_info("Hardware DMA cache coherency disabled\n");
-               else
-                       pr_info("Hardware DMA cache coherency enabled\n");
-       } else {
-               if (coherentio == 1)
-                       pr_info("Hardware DMA cache coherency unsupported, but enabled from command line!\n");
-               else
-                       pr_info("Software DMA cache coherency enabled\n");
-       }
-}
-
 void __init *plat_get_fdt(void)
 {
        if (fw_arg0 != -2)
@@ -93,8 +70,6 @@ void __init *plat_get_fdt(void)
 void __init plat_mem_setup(void)
 {
        __dt_setup_arch(plat_get_fdt());
-
-       plat_setup_iocoherency();
 }
 
 #define DEFAULT_CPC_BASE_ADDR  0x1bde0000