ARC: HSDK-4xD: use active low polarity of cpu_start pulse

Add quirk for HSDK-4xD - due to HW issues HSDK can use any pulse
polarity but HSDK-4xD require active low polarity of cpu_start pulse.

So use low polarity of cpu_start pulse for both board.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

diff --git a/board/synopsys/hsdk/hsdk.c b/board/synopsys/hsdk/hsdk.c
index 771f7bbf8868b8fcb2d9c147620b03072d3565c2..577893de2a1fdd172e10beef35a490593eb16fba 100644 (file)
--- a/board/synopsys/hsdk/hsdk.c
+++ b/board/synopsys/hsdk/hsdk.c
@@ -40,6 +40,7 @@ DECLARE_GLOBAL_DATA_PTR;
 #define CREG_BASE              (ARC_PERIPHERAL_BASE + 0x1000)
 #define CREG_CPU_START         (CREG_BASE + 0x400)
 #define CREG_CPU_START_MASK    0xF
+#define CREG_CPU_START_POL     BIT(4)
 
 #define SDIO_BASE              (ARC_PERIPHERAL_BASE + 0xA000)
 #define SDIO_UHS_REG_EXT       (SDIO_BASE + 0x108)
@@ -331,25 +332,36 @@ static inline void halt_this_cpu(void)
        __builtin_arc_flag(1);
 }
 
-static void smp_kick_cpu_x(u32 cpu_id)
+static u32 get_masked_cpu_ctart_reg(void)
 {
        int cmd = readl((void __iomem *)CREG_CPU_START);
 
+       /*
+        * Quirk for HSDK-4xD - due to HW issues HSDK can use any pulse polarity
+        * and HSDK-4xD require active low polarity of cpu_start pulse.
+        */
+       cmd &= ~CREG_CPU_START_POL;
+
+       cmd &= ~CREG_CPU_START_MASK;
+
+       return cmd;
+}
+
+static void smp_kick_cpu_x(u32 cpu_id)
+{
+       int cmd;
+
        if (cpu_id > NR_CPUS)
                return;
 
-       cmd &= ~CREG_CPU_START_MASK;
+       cmd = get_masked_cpu_ctart_reg();
        cmd |= (1 << cpu_id);
        writel(cmd, (void __iomem *)CREG_CPU_START);
 }
 
 static u32 prepare_cpu_ctart_reg(void)
 {
-       int cmd = readl((void __iomem *)CREG_CPU_START);
-
-       cmd &= ~CREG_CPU_START_MASK;
-
-       return cmd | env_common.core_mask.val;
+       return get_masked_cpu_ctart_reg() | env_common.core_mask.val;
 }
 
 /* slave CPU entry for configuration */