Introduce a Versatile Express specific function to read/write
motherboard settings.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
xen/arch/arm/Makefile | 1 +
xen/arch/arm/platform_vexpress.c | 97 +++++++++++++++++++++++++++++++
xen/include/asm-arm/platform_vexpress.h | 23 +++++++
3 files changed, 121 insertions(+), 0 deletions(-)
create mode 100644 xen/arch/arm/platform_vexpress.c
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 4c61b04..24689c5 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -18,6 +18,7 @@ obj-y += p2m.o
obj-y += percpu.o
obj-y += guestcopy.o
obj-y += physdev.o
+obj-y += platform_vexpress.o
obj-y += setup.o
obj-y += time.o
obj-y += smpboot.o
diff --git a/xen/arch/arm/platform_vexpress.c b/xen/arch/arm/platform_vexpress.c
new file mode 100644
index 0000000..41e3806
--- /dev/null
+++ b/xen/arch/arm/platform_vexpress.c
@@ -0,0 +1,97 @@
+/*
+ * xen/arch/arm/platform_vexpress.c
+ *
+ * Versatile Express specific settings
+ *
+ * Stefano Stabellini <stefano.stabellini@eu.citrix.com>
+ * Copyright (c) 2012 Citrix Systems.
+ *
+ * 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/platform_vexpress.h>
+#include <xen/mm.h>
+
+#define DCC_SHIFT 26
+#define FUNCTION_SHIFT 20
+#define SITE_SHIFT 16
+#define POSITION_SHIFT 12
+#define DEVICE_SHIFT 0
+
+int vexpress_syscfg(int write, int function, int device, uint32_t *data)
+{
+ uint32_t *syscfg = (uint32_t *) FIXMAP_ADDR(FIXMAP_MISC);
+ uint32_t stat;
+ int dcc = 0; /* DCC to access */
+ int site = 0; /* motherboard */
+ int position = 0; /* motherboard */
+
+ set_fixmap(FIXMAP_MISC, V2M_SYS_MMIO_BASE >> PAGE_SHIFT, DEV_SHARED);
+
+ if ( syscfg[V2M_SYS_CFGCTRL] & V2M_SYS_CFG_START )
+ return -1;
+
+ /* clear the complete bit in the V2M_SYS_CFGSTAT status register */
+ syscfg[V2M_SYS_CFGSTAT] = 0;
+
+ if ( write )
+ {
+ /* write data */
+ syscfg[V2M_SYS_CFGDATA] = *data;
+
+ /* set control register */
+ syscfg[V2M_SYS_CFGCTRL] = V2M_SYS_CFG_START | V2M_SYS_CFG_WRITE |
+ (dcc << DCC_SHIFT) | (function << FUNCTION_SHIFT) |
+ (site << SITE_SHIFT) | (position << POSITION_SHIFT) |
+ (device << DEVICE_SHIFT);
+
+ /* wait for complete flag to be set */
+ do {
+ stat = syscfg[V2M_SYS_CFGSTAT];
+ dsb();
+ } while ( !(stat & V2M_SYS_CFG_COMPLETE) );
+
+ /* check error status and return error flag if set */
+ if ( stat & V2M_SYS_CFG_ERROR )
+ return -1;
+ } else {
+ /* set control register */
+ syscfg[V2M_SYS_CFGCTRL] = V2M_SYS_CFG_START | (dcc << DCC_SHIFT) |
+ (function << FUNCTION_SHIFT) | (site << SITE_SHIFT) |
+ (position << POSITION_SHIFT) | (device << DEVICE_SHIFT);
+
+ /* wait for complete flag to be set */
+ do {
+ stat = syscfg[V2M_SYS_CFGSTAT];
+ dsb();
+ } while ( !(stat & V2M_SYS_CFG_COMPLETE) );
+
+ /* check error status flag and return error flag if set */
+ if ( stat & V2M_SYS_CFG_ERROR )
+ return -1;
+ else
+ /* read data */
+ *data = syscfg[V2M_SYS_CFGDATA];
+ }
+
+ clear_fixmap(FIXMAP_MISC);
+
+ return 0;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-arm/platform_vexpress.h b/xen/include/asm-arm/platform_vexpress.h
index 3556af3..407602d 100644
--- a/xen/include/asm-arm/platform_vexpress.h
+++ b/xen/include/asm-arm/platform_vexpress.h
@@ -6,6 +6,29 @@
#define V2M_SYS_FLAGSSET (0x30)
#define V2M_SYS_FLAGSCLR (0x34)
+#define V2M_SYS_CFGDATA (0x00A0/4)
+#define V2M_SYS_CFGCTRL (0x00A4/4)
+#define V2M_SYS_CFGSTAT (0x00A8/4)
+
+#define V2M_SYS_CFG_START (1<<31)
+#define V2M_SYS_CFG_WRITE (1<<30)
+#define V2M_SYS_CFG_ERROR (1<<1)
+#define V2M_SYS_CFG_COMPLETE (1<<0)
+
+#define V2M_SYS_CFG_OSC_FUNC 1
+#define V2M_SYS_CFG_OSC0 0
+#define V2M_SYS_CFG_OSC1 1
+#define V2M_SYS_CFG_OSC2 2
+#define V2M_SYS_CFG_OSC3 3
+#define V2M_SYS_CFG_OSC4 4
+#define V2M_SYS_CFG_OSC5 5
+
+#ifndef __ASSEMBLY__
+#include <xen/inttypes.h>
+
+int vexpress_syscfg(int write, int function, int device, uint32_t *data);
+#endif
+
#endif /* __ASM_ARM_PLATFORM_H */
/*
* Local variables:
--
1.7.2.5
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motherboard settings.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
xen/arch/arm/Makefile | 1 +
xen/arch/arm/platform_vexpress.c | 97 +++++++++++++++++++++++++++++++
xen/include/asm-arm/platform_vexpress.h | 23 +++++++
3 files changed, 121 insertions(+), 0 deletions(-)
create mode 100644 xen/arch/arm/platform_vexpress.c
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 4c61b04..24689c5 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -18,6 +18,7 @@ obj-y += p2m.o
obj-y += percpu.o
obj-y += guestcopy.o
obj-y += physdev.o
+obj-y += platform_vexpress.o
obj-y += setup.o
obj-y += time.o
obj-y += smpboot.o
diff --git a/xen/arch/arm/platform_vexpress.c b/xen/arch/arm/platform_vexpress.c
new file mode 100644
index 0000000..41e3806
--- /dev/null
+++ b/xen/arch/arm/platform_vexpress.c
@@ -0,0 +1,97 @@
+/*
+ * xen/arch/arm/platform_vexpress.c
+ *
+ * Versatile Express specific settings
+ *
+ * Stefano Stabellini <stefano.stabellini@eu.citrix.com>
+ * Copyright (c) 2012 Citrix Systems.
+ *
+ * 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/platform_vexpress.h>
+#include <xen/mm.h>
+
+#define DCC_SHIFT 26
+#define FUNCTION_SHIFT 20
+#define SITE_SHIFT 16
+#define POSITION_SHIFT 12
+#define DEVICE_SHIFT 0
+
+int vexpress_syscfg(int write, int function, int device, uint32_t *data)
+{
+ uint32_t *syscfg = (uint32_t *) FIXMAP_ADDR(FIXMAP_MISC);
+ uint32_t stat;
+ int dcc = 0; /* DCC to access */
+ int site = 0; /* motherboard */
+ int position = 0; /* motherboard */
+
+ set_fixmap(FIXMAP_MISC, V2M_SYS_MMIO_BASE >> PAGE_SHIFT, DEV_SHARED);
+
+ if ( syscfg[V2M_SYS_CFGCTRL] & V2M_SYS_CFG_START )
+ return -1;
+
+ /* clear the complete bit in the V2M_SYS_CFGSTAT status register */
+ syscfg[V2M_SYS_CFGSTAT] = 0;
+
+ if ( write )
+ {
+ /* write data */
+ syscfg[V2M_SYS_CFGDATA] = *data;
+
+ /* set control register */
+ syscfg[V2M_SYS_CFGCTRL] = V2M_SYS_CFG_START | V2M_SYS_CFG_WRITE |
+ (dcc << DCC_SHIFT) | (function << FUNCTION_SHIFT) |
+ (site << SITE_SHIFT) | (position << POSITION_SHIFT) |
+ (device << DEVICE_SHIFT);
+
+ /* wait for complete flag to be set */
+ do {
+ stat = syscfg[V2M_SYS_CFGSTAT];
+ dsb();
+ } while ( !(stat & V2M_SYS_CFG_COMPLETE) );
+
+ /* check error status and return error flag if set */
+ if ( stat & V2M_SYS_CFG_ERROR )
+ return -1;
+ } else {
+ /* set control register */
+ syscfg[V2M_SYS_CFGCTRL] = V2M_SYS_CFG_START | (dcc << DCC_SHIFT) |
+ (function << FUNCTION_SHIFT) | (site << SITE_SHIFT) |
+ (position << POSITION_SHIFT) | (device << DEVICE_SHIFT);
+
+ /* wait for complete flag to be set */
+ do {
+ stat = syscfg[V2M_SYS_CFGSTAT];
+ dsb();
+ } while ( !(stat & V2M_SYS_CFG_COMPLETE) );
+
+ /* check error status flag and return error flag if set */
+ if ( stat & V2M_SYS_CFG_ERROR )
+ return -1;
+ else
+ /* read data */
+ *data = syscfg[V2M_SYS_CFGDATA];
+ }
+
+ clear_fixmap(FIXMAP_MISC);
+
+ return 0;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-arm/platform_vexpress.h b/xen/include/asm-arm/platform_vexpress.h
index 3556af3..407602d 100644
--- a/xen/include/asm-arm/platform_vexpress.h
+++ b/xen/include/asm-arm/platform_vexpress.h
@@ -6,6 +6,29 @@
#define V2M_SYS_FLAGSSET (0x30)
#define V2M_SYS_FLAGSCLR (0x34)
+#define V2M_SYS_CFGDATA (0x00A0/4)
+#define V2M_SYS_CFGCTRL (0x00A4/4)
+#define V2M_SYS_CFGSTAT (0x00A8/4)
+
+#define V2M_SYS_CFG_START (1<<31)
+#define V2M_SYS_CFG_WRITE (1<<30)
+#define V2M_SYS_CFG_ERROR (1<<1)
+#define V2M_SYS_CFG_COMPLETE (1<<0)
+
+#define V2M_SYS_CFG_OSC_FUNC 1
+#define V2M_SYS_CFG_OSC0 0
+#define V2M_SYS_CFG_OSC1 1
+#define V2M_SYS_CFG_OSC2 2
+#define V2M_SYS_CFG_OSC3 3
+#define V2M_SYS_CFG_OSC4 4
+#define V2M_SYS_CFG_OSC5 5
+
+#ifndef __ASSEMBLY__
+#include <xen/inttypes.h>
+
+int vexpress_syscfg(int write, int function, int device, uint32_t *data);
+#endif
+
#endif /* __ASM_ARM_PLATFORM_H */
/*
* Local variables:
--
1.7.2.5
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