[PATCH 1/5] powerpc: Add platform support for AmigaOne
Gerhard Pircher
gerhard_pircher at gmx.net
Thu Jan 8 00:54:57 EST 2009
This commit adds the setup code for booting Linux on AmigaOne G3SE (G3
only), AmigaOne XE and uA1 (G3/G4) desktop computers. These boards were
sold by Eyetech and are based on MAI Logic's Teron boards and its
Articia S northbridge.
The AmigaOne uses U-boot as firmware, which doesn't support a flattened
device tree yet. The northbridge has some design flaws, which makes it
necessary to use non cacheable memory for DMA operations
(CONFIG_NOT_COHERENT_CACHE) and to avoid setting the coherence (M) flag
for memory pages.
Signed-off-by: Gerhard Pircher <gerhard_pircher at gmx.net>
---
arch/powerpc/platforms/Kconfig | 1 +
arch/powerpc/platforms/Makefile | 1 +
arch/powerpc/platforms/amigaone/Kconfig | 18 +++
arch/powerpc/platforms/amigaone/Makefile | 1 +
arch/powerpc/platforms/amigaone/setup.c | 197 ++++++++++++++++++++++++++++++
5 files changed, 218 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/platforms/amigaone/Kconfig
create mode 100644 arch/powerpc/platforms/amigaone/Makefile
create mode 100644 arch/powerpc/platforms/amigaone/setup.c
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 47fe2be..3fce996 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -28,6 +28,7 @@ source "arch/powerpc/platforms/86xx/Kconfig"
source "arch/powerpc/platforms/embedded6xx/Kconfig"
source "arch/powerpc/platforms/44x/Kconfig"
source "arch/powerpc/platforms/40x/Kconfig"
+source "arch/powerpc/platforms/amigaone/Kconfig"
config PPC_NATIVE
bool
diff --git a/arch/powerpc/platforms/Makefile b/arch/powerpc/platforms/Makefile
index 8079e0b..f741919 100644
--- a/arch/powerpc/platforms/Makefile
+++ b/arch/powerpc/platforms/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_PPC_PASEMI) += pasemi/
obj-$(CONFIG_PPC_CELL) += cell/
obj-$(CONFIG_PPC_PS3) += ps3/
obj-$(CONFIG_EMBEDDED6xx) += embedded6xx/
+obj-$(CONFIG_AMIGAONE) += amigaone/
diff --git a/arch/powerpc/platforms/amigaone/Kconfig b/arch/powerpc/platforms/amigaone/Kconfig
new file mode 100644
index 0000000..9276a96
--- /dev/null
+++ b/arch/powerpc/platforms/amigaone/Kconfig
@@ -0,0 +1,18 @@
+config AMIGAONE
+ bool "Eyetech AmigaOne/MAI Teron"
+ depends on PPC32 && BROKEN_ON_SMP && PPC_MULTIPLATFORM
+ select PPC_I8259
+ select PPC_INDIRECT_PCI
+ select PPC_UDBG_16550
+ select PCI
+ select NOT_COHERENT_CACHE
+ select CHECK_CACHE_COHERENCY
+ select DEFAULT_UIMAGE
+ select PCSPKR_PLATFORM
+ help
+ Select AmigaOne for the following machines:
+ - AmigaOne SE/Teron CX (G3 only)
+ - AmigaOne XE/Teron PX
+ - uA1/Teron mini
+ More information is available at:
+ <http://amigaone-linux.sourceforge.net/>.
diff --git a/arch/powerpc/platforms/amigaone/Makefile b/arch/powerpc/platforms/amigaone/Makefile
new file mode 100644
index 0000000..e6885b3
--- /dev/null
+++ b/arch/powerpc/platforms/amigaone/Makefile
@@ -0,0 +1 @@
+obj-y += setup.o
diff --git a/arch/powerpc/platforms/amigaone/setup.c b/arch/powerpc/platforms/amigaone/setup.c
new file mode 100644
index 0000000..30c9b46
--- /dev/null
+++ b/arch/powerpc/platforms/amigaone/setup.c
@@ -0,0 +1,197 @@
+/*
+ * AmigaOne platform setup
+ *
+ * Copyright 2008 Gerhard Pircher (gerhard_pircher at gmx.net)
+ *
+ * Based on original amigaone_setup.c source code
+ * Copyright 2003 by Hans-Joerg Frieden and Thomas Frieden
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/seq_file.h>
+#include <linux/utsrelease.h>
+
+#include <asm/machdep.h>
+#include <asm/cputable.h>
+#include <asm/prom.h>
+#include <asm/pci-bridge.h>
+#include <asm/i8259.h>
+#include <asm/time.h>
+#include <asm/udbg.h>
+
+void amigaone_show_cpuinfo(struct seq_file *m)
+{
+ struct device_node *root;
+ const char *model = "";
+
+ root = of_find_node_by_path("/");
+ if (root)
+ model = of_get_property(root, "model", NULL);
+ seq_printf(m, "machine\t\t: %s\n", model);
+
+ of_node_put(root);
+ return;
+}
+
+static int __init amigaone_add_bridge(struct device_node *dev)
+{
+ int len;
+ struct pci_controller *hose;
+ const int *bus_range;
+
+ printk(KERN_INFO "Adding PCI host bridge %s\n", dev->full_name);
+
+ bus_range = of_get_property(dev, "bus-range", &len);
+ if ((bus_range == NULL) || (len < 2 * sizeof(int)))
+ printk(KERN_WARNING "Can't get bus-range for %s, assume"
+ " bus 0\n", dev->full_name);
+
+ hose = pcibios_alloc_controller(dev);
+ if (hose == NULL)
+ return -ENOMEM;
+
+ hose->first_busno = bus_range ? bus_range[0] : 0;
+ hose->last_busno = bus_range ? bus_range[1] : 0xff;
+
+ setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc, 0);
+
+ /* Interpret the "ranges" property */
+ /* This also maps the I/O region and sets isa_io/mem_base */
+ pci_process_bridge_OF_ranges(hose, dev, 1);
+
+ return 0;
+}
+
+void __init amigaone_setup_arch(void)
+{
+ struct device_node *np;
+
+ /* Initialization until calibrate_delay() runs. */
+ loops_per_jiffy = 50000000/HZ;
+
+ /* Lookup PCI host bridges. */
+ for_each_compatible_node(np, "pci", "mai-logic,articia-s")
+ amigaone_add_bridge(np);
+
+ if (ppc_md.progress)
+ ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
+}
+
+void __init amigaone_init_IRQ(void)
+{
+ struct device_node *pic, *np = NULL;
+ const unsigned long *prop = NULL;
+ unsigned long int_ack = 0;
+
+ /* Search for ISA interrupt controller. */
+ pic = of_find_compatible_node(NULL, "interrupt-controller",
+ "pnpPNP,000");
+ BUG_ON(pic == NULL);
+
+ /* Look for interrupt acknowledge address in the PCI root node. */
+ np = of_find_compatible_node(NULL, "pci", "mai-logic,articia-s");
+ if (np) {
+ prop = of_get_property(np, "8259-interrupt-acknowledge", NULL);
+ if (prop)
+ int_ack = prop[0];
+ of_node_put(np);
+ }
+
+ if (int_ack == 0)
+ printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
+ " address, polling\n");
+
+ i8259_init(pic, int_ack);
+ ppc_md.get_irq = i8259_irq;
+ irq_set_default_host(i8259_get_host());
+}
+
+void __init amigaone_init(void)
+{
+ request_region(0x00, 0x20, "dma1");
+ request_region(0x40, 0x20, "timer");
+ request_region(0x80, 0x10, "dma page reg");
+ request_region(0xc0, 0x20, "dma2");
+}
+
+/* Copied from U-Boot. */
+static inline void amigaone_soft_restart(unsigned long addr)
+{
+ /* SRR0 has system reset vector, SRR1 has default MSR value.
+ * rfi restores MSR from SRR1 and sets the PC to the SRR0 value.
+ */
+ __asm__ __volatile__ ("mtspr 26, %0" :: "r" (addr));
+ __asm__ __volatile__ ("li 4, (1 << 6)" ::: "r4");
+ __asm__ __volatile__ ("mtspr 27, 4");
+ __asm__ __volatile__ ("rfi");
+}
+
+void amigaone_restart(char *cmd)
+{
+ unsigned long addr;
+
+ local_irq_disable();
+
+ /* Flush and disable I/D cache. */
+ __asm__ __volatile__ ("mfspr 3, 1008" ::: "r3");
+ __asm__ __volatile__ ("ori 5, 5, 0xcc00" ::: "r5");
+ __asm__ __volatile__ ("ori 4, 3, 0xc00" ::: "r4");
+ __asm__ __volatile__ ("andc 5, 3, 5" ::: "r5");
+ __asm__ __volatile__ ("sync");
+ __asm__ __volatile__ ("mtspr 1008, 4");
+ __asm__ __volatile__ ("isync");
+ __asm__ __volatile__ ("sync");
+ __asm__ __volatile__ ("mtspr 1008, 5");
+ __asm__ __volatile__ ("isync");
+ __asm__ __volatile__ ("sync");
+
+ addr = 0xfff00100;
+ amigaone_soft_restart(addr);
+
+ /* Not reached. */
+ while (1);
+}
+
+static int __init amigaone_probe(void)
+{
+ unsigned long root = of_get_flat_dt_root();
+
+ if (of_flat_dt_is_compatible(root, "eyetech,amigaone")) {
+ /* Coherent memory access cause complete system lockup! Thus
+ * disable this CPU feature, even if the CPU needs it. The L2
+ * cache prefetch engines sould be disabled later on.
+ */
+ cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
+
+ /* Patch out unwanted feature. */
+ do_feature_fixups(cur_cpu_spec->cpu_features,
+ PTRRELOC(&__start___ftr_fixup),
+ PTRRELOC(&__stop___ftr_fixup));
+
+ ISA_DMA_THRESHOLD = 0x00ffffff;
+ DMA_MODE_READ = 0x44;
+ DMA_MODE_WRITE = 0x48;
+
+ return 1;
+ }
+
+ return 0;
+}
+
+define_machine(amigaone) {
+ .name = "AmigaOne",
+ .probe = amigaone_probe,
+ .setup_arch = amigaone_setup_arch,
+ .init = amigaone_init,
+ .show_cpuinfo = amigaone_show_cpuinfo,
+ .init_IRQ = amigaone_init_IRQ,
+ .restart = amigaone_restart,
+ .calibrate_decr = generic_calibrate_decr,
+ .progress = udbg_progress,
+};
--
1.5.6.5
--
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