From: Albert Herranz <albert_herranz@yahoo.es>
To: linuxppc-dev@lists.ozlabs.org
Cc: Albert Herranz <albert_herranz@yahoo.es>
Subject: [RFC PATCH 16/19] powerpc: wii: hollywood interrupt controller support
Date: Sun, 22 Nov 2009 23:01:47 +0100 [thread overview]
Message-ID: <1258927311-4340-17-git-send-email-albert_herranz@yahoo.es> (raw)
In-Reply-To: <1258927311-4340-16-git-send-email-albert_herranz@yahoo.es>
Add support for the dual interrupt controller included in the "Hollywood"
chipset of the Nintendo Wii video game console.
This interrupt controller serves both the Broadway processor (as a cascade)
and the Starlet processor, and is used to manage interrupts for the
non-classic hardware.
Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
---
arch/powerpc/platforms/embedded6xx/Kconfig | 5 +
arch/powerpc/platforms/embedded6xx/Makefile | 1 +
arch/powerpc/platforms/embedded6xx/hlwd-pic.c | 238 +++++++++++++++++++++++++
arch/powerpc/platforms/embedded6xx/hlwd-pic.h | 22 +++
4 files changed, 266 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/platforms/embedded6xx/hlwd-pic.c
create mode 100644 arch/powerpc/platforms/embedded6xx/hlwd-pic.h
diff --git a/arch/powerpc/platforms/embedded6xx/Kconfig b/arch/powerpc/platforms/embedded6xx/Kconfig
index efb2ea1..490f89e 100644
--- a/arch/powerpc/platforms/embedded6xx/Kconfig
+++ b/arch/powerpc/platforms/embedded6xx/Kconfig
@@ -122,3 +122,8 @@ config GAMECUBE
Select GAMECUBE if configuring for the Nintendo GameCube.
More information at: <http://gc-linux.sourceforge.net/>
+config HLWD_PIC
+ bool
+ depends on STARLET_MINI
+ default y
+
diff --git a/arch/powerpc/platforms/embedded6xx/Makefile b/arch/powerpc/platforms/embedded6xx/Makefile
index b0324ed..c1dcc54 100644
--- a/arch/powerpc/platforms/embedded6xx/Makefile
+++ b/arch/powerpc/platforms/embedded6xx/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_PPC_C2K) += c2k.o
obj-$(CONFIG_USBGECKO_UDBG) += usbgecko_udbg.o
obj-$(CONFIG_FLIPPER_PIC) += flipper-pic.o
obj-$(CONFIG_GAMECUBE) += gamecube.o gamecube_dev.o
+obj-$(CONFIG_HLWD_PIC) += hlwd-pic.o
diff --git a/arch/powerpc/platforms/embedded6xx/hlwd-pic.c b/arch/powerpc/platforms/embedded6xx/hlwd-pic.c
new file mode 100644
index 0000000..b024800
--- /dev/null
+++ b/arch/powerpc/platforms/embedded6xx/hlwd-pic.c
@@ -0,0 +1,238 @@
+/*
+ * arch/powerpc/platforms/embedded6xx/hlwd-pic.c
+ *
+ * Nintendo Wii "Hollywood" interrupt controller support.
+ * Copyright (C) 2009 The GameCube Linux Team
+ * Copyright (C) 2009 Albert Herranz
+ *
+ * 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.
+ *
+ */
+#define DRV_MODULE_NAME "hlwd-pic"
+#define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <asm/io.h>
+
+#include "hlwd-pic.h"
+
+#define HLWD_NR_IRQS 32
+
+/*
+ * Each interrupt has a corresponding bit in both
+ * the Interrupt Cause (ICR) and Interrupt Mask (IMR) registers.
+ *
+ * Enabling/disabling an interrupt line involves asserting/clearing
+ * the corresponding bit in IMR. ACK'ing a request simply involves
+ * asserting the corresponding bit in ICR.
+ */
+#define HW_BROADWAY_ICR 0x00
+#define HW_BROADWAY_IMR 0x04
+
+
+/*
+ * IRQ chip hooks.
+ *
+ */
+
+static void hlwd_pic_mask_and_ack(unsigned int virq)
+{
+ int irq = virq_to_hw(virq);
+ void __iomem *io_base = get_irq_chip_data(virq);
+
+ clear_bit(irq, io_base + HW_BROADWAY_IMR);
+ set_bit(irq, io_base + HW_BROADWAY_ICR);
+}
+
+static void hlwd_pic_ack(unsigned int virq)
+{
+ int irq = virq_to_hw(virq);
+ void __iomem *io_base = get_irq_chip_data(virq);
+
+ set_bit(irq, io_base + HW_BROADWAY_ICR);
+}
+
+static void hlwd_pic_mask(unsigned int virq)
+{
+ int irq = virq_to_hw(virq);
+ void __iomem *io_base = get_irq_chip_data(virq);
+
+ clear_bit(irq, io_base + HW_BROADWAY_IMR);
+}
+
+static void hlwd_pic_unmask(unsigned int virq)
+{
+ int irq = virq_to_hw(virq);
+ void __iomem *io_base = get_irq_chip_data(virq);
+
+ set_bit(irq, io_base + HW_BROADWAY_IMR);
+}
+
+
+static struct irq_chip hlwd_pic = {
+ .typename = "hlwd-pic",
+ .ack = hlwd_pic_ack,
+ .mask_ack = hlwd_pic_mask_and_ack,
+ .mask = hlwd_pic_mask,
+ .unmask = hlwd_pic_unmask,
+};
+
+/*
+ * IRQ host hooks.
+ *
+ */
+
+static struct irq_host *hlwd_irq_host;
+
+static int hlwd_pic_map(struct irq_host *h, unsigned int virq,
+ irq_hw_number_t hwirq)
+{
+ set_irq_chip_data(virq, h->host_data);
+ get_irq_desc(virq)->status |= IRQ_LEVEL;
+ set_irq_chip_and_handler(virq, &hlwd_pic, handle_level_irq);
+ return 0;
+}
+
+static void hlwd_pic_unmap(struct irq_host *h, unsigned int irq)
+{
+ set_irq_chip_data(irq, NULL);
+ set_irq_chip(irq, NULL);
+}
+
+static struct irq_host_ops hlwd_irq_host_ops = {
+ .map = hlwd_pic_map,
+ .unmap = hlwd_pic_unmap,
+};
+
+static unsigned int __hlwd_pic_get_irq(struct irq_host *h)
+{
+ void __iomem *io_base = h->host_data;
+ int irq;
+ u32 irq_status;
+
+ irq_status = in_be32(io_base + HW_BROADWAY_ICR) &
+ in_be32(io_base + HW_BROADWAY_IMR);
+ if (irq_status == 0)
+ return NO_IRQ_IGNORE; /* no more IRQs pending */
+
+ __asm__ __volatile__("cntlzw %0,%1" : "=r"(irq) : "r"(irq_status));
+ return irq_linear_revmap(h, 31 - irq);
+}
+
+static void hlwd_pic_irq_cascade(unsigned int cascade_virq,
+ struct irq_desc *desc)
+{
+ struct irq_host *irq_host = get_irq_data(cascade_virq);
+ unsigned int virq;
+
+ spin_lock(&desc->lock);
+ desc->chip->mask(cascade_virq); /* IRQ_LEVEL */
+ spin_unlock(&desc->lock);
+
+ virq = __hlwd_pic_get_irq(irq_host);
+ if (virq != NO_IRQ_IGNORE)
+ generic_handle_irq(virq);
+ else
+ pr_err("spurious interrupt!\n");
+
+ spin_lock(&desc->lock);
+ desc->chip->ack(cascade_virq); /* IRQ_LEVEL */
+ if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask)
+ desc->chip->unmask(cascade_virq);
+ spin_unlock(&desc->lock);
+}
+
+/*
+ * Platform hooks.
+ *
+ */
+
+static void __hlwd_quiesce(void __iomem *io_base)
+{
+ /* mask and ack all IRQs */
+ out_be32(io_base + HW_BROADWAY_IMR, 0);
+ out_be32(io_base + HW_BROADWAY_ICR, ~0);
+}
+
+struct irq_host *hlwd_pic_init(struct device_node *np)
+{
+ struct irq_host *irq_host;
+ struct resource res;
+ void __iomem *io_base;
+ int retval;
+
+ retval = of_address_to_resource(np, 0, &res);
+ if (retval) {
+ pr_err("no io memory range found\n");
+ return NULL;
+ }
+ io_base = ioremap(res.start, resource_size(&res));
+ if (!io_base) {
+ pr_err("ioremap failed\n");
+ return NULL;
+ }
+
+ pr_info("controller at 0x%08x mapped to 0x%p\n", res.start, io_base);
+
+ __hlwd_quiesce(io_base);
+
+ irq_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR, HLWD_NR_IRQS,
+ &hlwd_irq_host_ops, NO_IRQ_IGNORE);
+ if (!irq_host) {
+ pr_err("failed to allocate irq_host\n");
+ return NULL;
+ }
+ irq_host->host_data = io_base;
+
+ return irq_host;
+}
+
+unsigned int hlwd_pic_get_irq(void)
+{
+ return __hlwd_pic_get_irq(hlwd_irq_host);
+}
+
+/*
+ * Probe function.
+ *
+ */
+
+void hlwd_pic_probe(void)
+{
+ struct irq_host *host;
+ struct device_node *np;
+ const u32 *interrupts;
+ int cascade_virq;
+
+ for_each_compatible_node(np, NULL, "nintendo,hollywood-pic") {
+ interrupts = of_get_property(np, "interrupts", NULL);
+ if (interrupts) {
+ host = hlwd_pic_init(np);
+ BUG_ON(!host);
+ cascade_virq = irq_of_parse_and_map(np, 0);
+ set_irq_data(cascade_virq, host);
+ set_irq_chained_handler(cascade_virq,
+ hlwd_pic_irq_cascade);
+ }
+ }
+}
+
+/**
+ * hlwd_quiesce() - quiesce hollywood irq controller
+ *
+ * Mask and ack all interrupt sources.
+ *
+ */
+void hlwd_quiesce(void)
+{
+ void __iomem *io_base = hlwd_irq_host->host_data;
+
+ __hlwd_quiesce(io_base);
+}
+
diff --git a/arch/powerpc/platforms/embedded6xx/hlwd-pic.h b/arch/powerpc/platforms/embedded6xx/hlwd-pic.h
new file mode 100644
index 0000000..d2e5a09
--- /dev/null
+++ b/arch/powerpc/platforms/embedded6xx/hlwd-pic.h
@@ -0,0 +1,22 @@
+/*
+ * arch/powerpc/platforms/embedded6xx/hlwd-pic.h
+ *
+ * Nintendo Wii "Hollywood" interrupt controller support.
+ * Copyright (C) 2009 The GameCube Linux Team
+ * Copyright (C) 2009 Albert Herranz
+ *
+ * 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.
+ *
+ */
+
+#ifndef __HLWD_PIC_H
+#define __HLWD_PIC_H
+
+extern unsigned int hlwd_pic_get_irq(void);
+extern void hlwd_pic_probe(void);
+extern void hlwd_quiesce(void);
+
+#endif
--
1.6.3.3
next prev parent reply other threads:[~2009-11-22 22:02 UTC|newest]
Thread overview: 181+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-22 22:01 [RFC PATCH 00/19] powerpc: nintendo gamecube and wii support Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 01/19] powerpc: gamecube/wii: usbgecko bootwrapper console support Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 02/19] powerpc: gamecube: device tree Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 03/19] powerpc: gamecube: bootwrapper bits Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 04/19] powerpc: wii: device tree Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 05/19] powerpc: wii: bootwrapper bits Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 06/19] powerpc: gamecube/wii: introduce GAMECUBE_COMMON Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 07/19] powerpc: gamecube/wii: declare as non-coherent platforms Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 08/19] powerpc: gamecube/wii: do not include PCI support Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 09/19] powerpc: gamecube/wii: udbg support for usbgecko Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 10/19] powerpc: gamecube/wii: early debugging using usbgecko Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 11/19] powerpc: gamecube/wii: flipper interrupt controller support Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 12/19] powerpc: gamecube: platform support Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 13/19] powerpc: gamecube: default config Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 14/19] powerpc: allow ioremap within reserved fake ram regions Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 15/19] powerpc: broadway processor support Albert Herranz
2009-11-22 22:01 ` Albert Herranz [this message]
2009-11-22 22:01 ` [RFC PATCH 17/19] powerpc: wii: bootmii starlet 'mini' firmware support Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 18/19] powerpc: wii: platform support Albert Herranz
2009-11-22 22:01 ` [RFC PATCH 19/19] powerpc: wii: default config Albert Herranz
2009-11-22 23:45 ` [RFC PATCH 18/19] powerpc: wii: platform support Grant Likely
2009-11-23 20:21 ` Albert Herranz
2009-11-24 22:24 ` Segher Boessenkool
2009-11-25 17:58 ` Albert Herranz
2009-11-26 22:05 ` Segher Boessenkool
2009-11-22 22:48 ` [RFC PATCH 17/19] powerpc: wii: bootmii starlet 'mini' firmware support Arnd Bergmann
2009-11-23 19:21 ` Albert Herranz
2009-11-24 22:13 ` Segher Boessenkool
2009-11-25 17:47 ` Albert Herranz
2009-11-26 22:00 ` Segher Boessenkool
2009-11-22 23:40 ` [RFC PATCH 16/19] powerpc: wii: hollywood interrupt controller support Grant Likely
2009-11-23 20:18 ` Albert Herranz
2009-11-24 21:54 ` Segher Boessenkool
2009-11-25 17:27 ` Albert Herranz
2009-11-26 5:23 ` Benjamin Herrenschmidt
2009-11-26 15:42 ` Albert Herranz
2009-11-26 21:13 ` Benjamin Herrenschmidt
2009-11-26 23:03 ` Segher Boessenkool
2009-11-22 23:38 ` [RFC PATCH 15/19] powerpc: broadway processor support Grant Likely
2009-11-23 20:16 ` Albert Herranz
2009-11-22 23:36 ` [RFC PATCH 14/19] powerpc: allow ioremap within reserved fake ram regions Grant Likely
2009-11-23 20:16 ` Albert Herranz
2009-11-23 20:41 ` Grant Likely
2009-11-23 23:45 ` Michael Ellerman
2009-11-24 17:09 ` Albert Herranz
2009-11-25 0:38 ` Michael Ellerman
2009-11-26 5:22 ` Benjamin Herrenschmidt
2009-11-26 15:35 ` Albert Herranz
2009-11-26 21:13 ` Benjamin Herrenschmidt
2009-11-22 23:34 ` [RFC PATCH 12/19] powerpc: gamecube: platform support Grant Likely
2009-11-23 20:02 ` Albert Herranz
2009-11-24 21:39 ` Segher Boessenkool
2009-11-25 17:24 ` Albert Herranz
2009-11-26 21:53 ` Segher Boessenkool
2009-11-26 22:07 ` Albert Herranz
2009-11-27 0:09 ` Segher Boessenkool
2009-11-27 21:35 ` Benjamin Herrenschmidt
2009-11-28 3:56 ` Grant Likely
2009-11-28 3:56 ` Grant Likely
2009-11-22 23:28 ` [RFC PATCH 11/19] powerpc: gamecube/wii: flipper interrupt controller support Grant Likely
2009-11-23 19:59 ` Albert Herranz
2009-11-26 5:18 ` Benjamin Herrenschmidt
2009-11-26 15:33 ` Albert Herranz
2009-11-26 21:12 ` Benjamin Herrenschmidt
2009-11-26 23:00 ` Segher Boessenkool
2009-11-26 23:38 ` Benjamin Herrenschmidt
2009-11-24 21:30 ` Segher Boessenkool
2009-11-25 17:13 ` Albert Herranz
2009-11-26 21:52 ` Segher Boessenkool
2009-11-26 22:05 ` Albert Herranz
2009-11-27 0:06 ` Segher Boessenkool
2009-11-27 12:17 ` Segher Boessenkool
2009-11-27 17:27 ` Albert Herranz
2009-11-27 21:34 ` Benjamin Herrenschmidt
2009-11-28 2:04 ` Segher Boessenkool
2009-11-28 2:26 ` Benjamin Herrenschmidt
2009-11-26 5:18 ` Benjamin Herrenschmidt
2009-11-26 15:30 ` Albert Herranz
2009-11-26 21:10 ` Benjamin Herrenschmidt
2009-11-22 22:27 ` [RFC PATCH 10/19] powerpc: gamecube/wii: early debugging using usbgecko Arnd Bergmann
2009-11-23 19:10 ` Albert Herranz
2009-11-23 22:13 ` Arnd Bergmann
2009-11-26 5:14 ` Benjamin Herrenschmidt
2009-11-26 22:54 ` Segher Boessenkool
2009-11-26 23:27 ` Benjamin Herrenschmidt
2009-11-24 0:54 ` Segher Boessenkool
2009-11-24 18:19 ` Albert Herranz
2009-11-22 23:22 ` [RFC PATCH 09/19] powerpc: gamecube/wii: udbg support for usbgecko Grant Likely
2009-11-24 0:49 ` Segher Boessenkool
2009-11-24 18:08 ` Albert Herranz
2009-11-24 21:19 ` Segher Boessenkool
2009-11-25 17:07 ` Albert Herranz
2009-11-26 5:12 ` Benjamin Herrenschmidt
2009-11-26 15:28 ` Albert Herranz
2009-11-26 21:02 ` Benjamin Herrenschmidt
2009-11-26 23:12 ` Segher Boessenkool
2009-11-22 23:21 ` [RFC PATCH 08/19] powerpc: gamecube/wii: do not include PCI support Grant Likely
2009-11-26 5:10 ` Benjamin Herrenschmidt
2009-11-22 22:20 ` [RFC PATCH 07/19] powerpc: gamecube/wii: declare as non-coherent platforms Arnd Bergmann
2009-11-23 19:06 ` Albert Herranz
2009-11-26 5:09 ` Benjamin Herrenschmidt
2009-11-22 23:20 ` [RFC PATCH 06/19] powerpc: gamecube/wii: introduce GAMECUBE_COMMON Grant Likely
2009-11-23 19:56 ` Albert Herranz
2009-11-24 0:35 ` Segher Boessenkool
2009-11-24 18:03 ` Albert Herranz
2009-11-24 21:15 ` Segher Boessenkool
2009-11-24 22:33 ` Arnd Bergmann
2009-11-25 17:06 ` Albert Herranz
2009-11-26 5:08 ` Benjamin Herrenschmidt
2009-11-26 15:22 ` Albert Herranz
2009-11-27 12:12 ` Segher Boessenkool
2009-11-22 23:19 ` [RFC PATCH 05/19] powerpc: wii: bootwrapper bits Grant Likely
2009-11-24 0:33 ` Segher Boessenkool
2009-11-24 17:56 ` Albert Herranz
2009-11-24 21:13 ` Segher Boessenkool
2009-11-22 23:18 ` [RFC PATCH 04/19] powerpc: wii: device tree Grant Likely
2009-11-23 19:54 ` Albert Herranz
2009-11-23 20:36 ` Grant Likely
2009-11-23 21:55 ` Albert Herranz
2009-11-25 16:57 ` Segher Boessenkool
2009-11-25 18:09 ` Albert Herranz
2009-11-25 17:49 ` Segher Boessenkool
2009-11-25 18:34 ` Albert Herranz
2009-11-26 4:58 ` Benjamin Herrenschmidt
2009-11-26 15:19 ` Albert Herranz
2009-11-26 4:51 ` Benjamin Herrenschmidt
2009-11-26 15:18 ` Albert Herranz
2009-11-26 21:01 ` Benjamin Herrenschmidt
2009-11-26 21:38 ` Albert Herranz
2009-11-26 22:37 ` Benjamin Herrenschmidt
2009-11-27 0:16 ` Segher Boessenkool
2009-11-27 0:15 ` Benjamin Herrenschmidt
2009-11-26 23:25 ` Segher Boessenkool
2009-11-26 22:50 ` Segher Boessenkool
2009-11-26 23:02 ` Albert Herranz
2009-11-26 4:45 ` Benjamin Herrenschmidt
2009-11-26 15:09 ` Albert Herranz
2009-11-26 20:48 ` Benjamin Herrenschmidt
2009-11-26 21:20 ` Albert Herranz
2009-11-26 23:17 ` Segher Boessenkool
2009-11-26 22:45 ` Segher Boessenkool
2009-11-22 23:11 ` [RFC PATCH 03/19] powerpc: gamecube: bootwrapper bits Grant Likely
2009-11-24 0:08 ` Segher Boessenkool
2009-11-24 17:38 ` Albert Herranz
2009-11-24 21:00 ` Segher Boessenkool
2009-11-24 23:45 ` Albert Herranz
2009-11-25 16:53 ` Segher Boessenkool
2009-11-26 4:36 ` Benjamin Herrenschmidt
2009-11-26 8:17 ` Gabriel Paubert
2009-11-26 8:46 ` Benjamin Herrenschmidt
2009-11-26 23:06 ` Segher Boessenkool
2009-11-26 4:35 ` Benjamin Herrenschmidt
2009-11-26 22:23 ` Segher Boessenkool
2009-11-22 23:02 ` [RFC PATCH 02/19] powerpc: gamecube: device tree Grant Likely
2009-11-23 19:44 ` Albert Herranz
2009-11-23 20:19 ` Grant Likely
2009-11-23 20:25 ` Albert Herranz
2009-11-24 22:53 ` Segher Boessenkool
2009-11-26 4:23 ` Benjamin Herrenschmidt
2009-11-27 12:09 ` Segher Boessenkool
2009-11-24 22:36 ` Segher Boessenkool
2009-11-26 4:23 ` Benjamin Herrenschmidt
2009-11-26 22:15 ` Segher Boessenkool
2009-11-26 22:38 ` Benjamin Herrenschmidt
2009-11-27 0:18 ` Segher Boessenkool
2009-11-26 4:21 ` Benjamin Herrenschmidt
2009-11-26 4:38 ` Grant Likely
2009-11-26 5:29 ` Benjamin Herrenschmidt
2009-11-26 5:51 ` Grant Likely
2009-11-26 22:30 ` Segher Boessenkool
2009-11-25 18:00 ` Segher Boessenkool
2009-11-25 18:43 ` Albert Herranz
2009-11-27 12:07 ` Segher Boessenkool
2009-11-26 4:27 ` Benjamin Herrenschmidt
2009-11-26 22:19 ` Segher Boessenkool
2009-11-22 22:50 ` [RFC PATCH 01/19] powerpc: gamecube/wii: usbgecko bootwrapper console support Grant Likely
2009-11-26 4:12 ` Benjamin Herrenschmidt
2009-11-22 22:48 ` [RFC PATCH 00/19] powerpc: nintendo gamecube and wii support Grant Likely
2009-11-22 22:49 ` Arnd Bergmann
2009-11-23 19:22 ` Albert Herranz
2009-11-23 5:13 ` Wolfram Sang
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