[Xen-devel] [PATCH v2] xen: arm64: Add support for Renesas RCar Gen3 H3 Salvator-X platform

[Dirk Behme <dirk.behme@xxxxxxxxxxxx>]

Signed-off-by: Dirk Behme <dirk.behme@xxxxxxxxxxxx>
---
Changes in v2: Drop unneeded rcar3.c
        
 docs/misc/arm/early-printk.txt    |  1 +
 xen/arch/arm/Rules.mk             |  1 +
 xen/arch/arm/arm64/debug-scif.inc | 54 +++++++++++++++++++++++++++++++++++++++
 xen/drivers/char/Kconfig          |  2 +-
 4 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 xen/arch/arm/arm64/debug-scif.inc

diff --git a/docs/misc/arm/early-printk.txt b/docs/misc/arm/early-printk.txt
index 41b528b..20acbc7 100644
--- a/docs/misc/arm/early-printk.txt
+++ b/docs/misc/arm/early-printk.txt
@@ -41,6 +41,7 @@ the name of the machine:
   - lager: printk with SCIF0 on Renesas R-Car H2 processors
   - midway: printk with the pl011 on Calxeda Midway processors
   - omap5432: printk with UART3 on TI OMAP5432 processors
+  - salvator-x: printk with SCIF2 on Renesas R-Car H3 processors
   - seattle: printk with pl011 for AMD Seattle processor
   - sun6i: printk with 8250 on Allwinner A31 processors
   - sun7i: printk with 8250 on Allwinner A20 processors
diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk
index 93304be..3003e7b 100644
--- a/xen/arch/arm/Rules.mk
+++ b/xen/arch/arm/Rules.mk
@@ -36,6 +36,7 @@ EARLY_PRINTK_juno           := pl011,0x7ff80000
 EARLY_PRINTK_lager          := scif,0xe6e60000
 EARLY_PRINTK_midway         := pl011,0xfff36000
 EARLY_PRINTK_omap5432       := 8250,0x48020000,2
+EARLY_PRINTK_salvator-x     := scif,0xe6e88000
 EARLY_PRINTK_seattle        := pl011,0xe1010000
 EARLY_PRINTK_sun6i          := 8250,0x01c28000,2
 EARLY_PRINTK_sun7i          := 8250,0x01c28000,2
diff --git a/xen/arch/arm/arm64/debug-scif.inc 
b/xen/arch/arm/arm64/debug-scif.inc
new file mode 100644
index 0000000..ff91c32
--- /dev/null
+++ b/xen/arch/arm/arm64/debug-scif.inc
@@ -0,0 +1,54 @@
+/*
+ * xen/arch/arm/arm64/debug-scif.inc
+ *
+ * SCIF specific debug code
+ *
+ * Based on xen/arch/arm/arm32/debug-scif.inc by
+ * Oleksandr Tyshchenko <oleksandr.tyshchenko@xxxxxxxxxxxxxxx>
+ * Copyright (C) 2014, Globallogic.
+ *
+ * Port to AARCH64 by
+ * Dirk Behme <dirk.behme@xxxxxxxxxxxx>
+ * Copyright (C) 2016, Robert Bosch Car Multimedia
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <asm/scif-uart.h>
+
+/* SCIF UART wait UART to be ready to transmit
+ * rb: register which contains the UART base address
+ * rc: scratch register
+ */
+.macro early_uart_ready xb, c
+1:
+        ldrh   w\c, [\xb, #SCIF_SCFSR]   /* <- SCFSR (status register) */
+        tst    w\c, #SCFSR_TDFE          /* Check TDFE bit */
+        beq    1b                        /* Wait for the UART to be ready */
+.endm
+
+/* SCIF UART transmit character
+ * rb: register which contains the UART base address
+ * rt: register which contains the character to transmit
+ */
+.macro early_uart_transmit xb, wt
+        strb   \wt, [\xb, #SCIF_SCFTDR]                  /* -> SCFTDR (data 
register) */
+        ldrh   \wt, [\xb, #SCIF_SCFSR]                   /* <- SCFSR (status 
register) */
+        and    \wt, \wt, #(~(SCFSR_TEND | SCFSR_TDFE))   /* Clear TEND and 
TDFE bits */
+        strh   \wt, [\xb, #SCIF_SCFSR]                   /* -> SCFSR (status 
register) */
+.endm
+
+/*
+ * Local variables:
+ * mode: ASM
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/drivers/char/Kconfig b/xen/drivers/char/Kconfig
index 08973cf..703a311 100644
--- a/xen/drivers/char/Kconfig
+++ b/xen/drivers/char/Kconfig
@@ -45,7 +45,7 @@ config HAS_OMAP
 config HAS_SCIF
        bool
        default y
-       depends on ARM_32
+       depends on ARM
        help
          This selects the SuperH SCI(F) UART. If you have a SuperH based board,
          say Y.
-- 
2.8.0


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