[PATCH 1/4] xen: arm64: Add Basic Platform support for APM X-Gene Storm.

[Pranavkumar Sawargaonkar <pranavkumar@linaro.org>]

This patch adds following things:
Early printk support for APM X-Gene platform.
Initial platform stubs for APM X-Gene.

Signed-off-by: Anup Patel <anup.patel@linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
---
 xen/arch/arm/Rules.mk                    |  5 +++
 xen/arch/arm/arm64/debug-xgene-storm.inc | 55 ++++++++++++++++++++++++++++++
 xen/arch/arm/platforms/Makefile          |  1 +
 xen/arch/arm/platforms/xgene-storm.c     | 57 ++++++++++++++++++++++++++++++++
 4 files changed, 118 insertions(+)
 create mode 100644 xen/arch/arm/arm64/debug-xgene-storm.inc
 create mode 100644 xen/arch/arm/platforms/xgene-storm.c

diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk
index bd79b26..b36120e 100644
--- a/xen/arch/arm/Rules.mk
+++ b/xen/arch/arm/Rules.mk
@@ -77,6 +77,11 @@ EARLY_PRINTK_INC := 8250
 EARLY_UART_BASE_ADDRESS := 0x01c28000
 EARLY_UART_REG_SHIFT := 2
 endif
+ifeq ($(CONFIG_EARLY_PRINTK), xgene-storm)
+EARLY_PRINTK_INC := xgene-storm
+EARLY_PRINTK_BAUD := 115200
+EARLY_UART_BASE_ADDRESS := 0x1c020000
+endif
 
 ifneq ($(EARLY_PRINTK_INC),)
 EARLY_PRINTK := y
diff --git a/xen/arch/arm/arm64/debug-xgene-storm.inc b/xen/arch/arm/arm64/debug-xgene-storm.inc
new file mode 100644
index 0000000..ebbb8d2
--- /dev/null
+++ b/xen/arch/arm/arm64/debug-xgene-storm.inc
@@ -0,0 +1,55 @@
+/*
+ * xen/arch/arm/arm64/debug-xgene-storm.inc
+ *
+ * X-Gene Storm specific debug code
+ *
+ * Copyright (c) 2013 Applied Micro.
+ *
+ * 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 <xen/8250-uart.h>
+
+#define XGENE_STORM_UART_LSR    0x14
+#define XGENE_STORM_UART_THR    0x00
+
+/* UART initialization
+ * rb: register which contains the UART base address
+ * rc: scratch register 1
+ * rd: scratch register 2 */
+.macro early_uart_init rb rc rd
+.endm
+
+/* UART wait UART to be ready to transmit
+ * xb: register which contains the UART base address
+ * c: scratch register */
+.macro early_uart_ready xb c
+1:
+       ldrb  w\c, [\xb, #XGENE_STORM_UART_LSR]
+       and w\c, w\c, #UART_LSR_THRE
+       cmp w\c, #UART_LSR_THRE
+       b.ne 1b
+.endm
+
+/* UART transmit character
+ * xb: register which contains the UART base address
+ * wt: register which contains the character to transmit */
+.macro early_uart_transmit xb wt
+        /* UART_THR  transmit holding */
+        strb   \wt, [\xb, #XGENE_STORM_UART_THR]
+.endm
+
+/*
+ * Local variables:
+ * mode: ASM
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/platforms/Makefile b/xen/arch/arm/platforms/Makefile
index 4aa82e8..8a6709f 100644
--- a/xen/arch/arm/platforms/Makefile
+++ b/xen/arch/arm/platforms/Makefile
@@ -2,3 +2,4 @@ obj-y += vexpress.o
 obj-y += exynos5.o
 obj-y += midway.o
 obj-y += omap5.o
+obj-y += xgene-storm.o
diff --git a/xen/arch/arm/platforms/xgene-storm.c b/xen/arch/arm/platforms/xgene-storm.c
new file mode 100644
index 0000000..8e2b3b6
--- /dev/null
+++ b/xen/arch/arm/platforms/xgene-storm.c
@@ -0,0 +1,57 @@
+/*
+ * xen/arch/arm/platforms/xgene-storm.c
+ *
+ * Applied Micro's X-Gene specific settings
+ *
+ * Pranavkumar Sawargaonkar <psawargaonkar@apm.com>
+ * Anup Patel <apatel@apm.com>
+ * Copyright (c) 2013 Applied Micro.
+ *
+ * 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 <xen/config.h>
+#include <xen/device_tree.h>
+#include <xen/domain_page.h>
+#include <xen/mm.h>
+#include <xen/vmap.h>
+#include <asm/platform.h>
+#include <asm/early_printk.h>
+
+static void xgene_storm_reset(void)
+{
+}
+
+static int xgene_storm_init(void)
+{
+        return 0;
+}
+
+static const char const *xgene_storm_dt_compat[] __initdata =
+{
+    "apm,xgene-storm",
+    NULL
+};
+
+PLATFORM_START(xgene_storm, "APM X-GENE STORM")
+    .compatible = xgene_storm_dt_compat,
+    .init = xgene_storm_init,
+    .reset = xgene_storm_reset,
+PLATFORM_END
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
1.8.2.1