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Commit 54b318aa authored by Gerhard Pircher's avatar Gerhard Pircher Committed by Benjamin Herrenschmidt
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powerpc/amigaone: Add platform support for AmigaOne 



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: default avatarGerhard Pircher <gerhard_pircher@gmx.net>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 8535ef05

arch/powerpc/platforms/Kconfig

+1 −0
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@@ -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

arch/powerpc/platforms/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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/

arch/powerpc/platforms/amigaone/Kconfig

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+18 −0
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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/>.

arch/powerpc/platforms/amigaone/Makefile

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+1 −0
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obj-y	+= setup.o

arch/powerpc/platforms/amigaone/setup.c

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+170 −0
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/*

 * AmigaOne platform setup

 *

 * Copyright 2008 Gerhard Pircher (gerhard_pircher@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/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>



extern void __flush_disable_L1(void);



void amigaone_show_cpuinfo(struct seq_file *m)

{

	seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");

}



static int __init amigaone_add_bridge(struct device_node *dev)

{

	const u32 *cfg_addr, *cfg_data;

	int len;

	const int *bus_range;

	struct pci_controller *hose;



	printk(KERN_INFO "Adding PCI host bridge %s\n", dev->full_name);



	cfg_addr = of_get_address(dev, 0, NULL, NULL);

	cfg_data = of_get_address(dev, 1, NULL, NULL);

	if ((cfg_addr == NULL) || (cfg_data == NULL))

		return -ENODEV;



	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, cfg_addr[0], cfg_data[0], 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;

	int phb = -ENODEV;



	/* Lookup PCI host bridges. */

	for_each_compatible_node(np, "pci", "mai-logic,articia-s")

		phb = amigaone_add_bridge(np);



	BUG_ON(phb != 0);



	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");

}



void amigaone_restart(char *cmd)

{

	local_irq_disable();



	/* Flush and disable caches. */

	__flush_disable_L1();



        /* Set SRR0 to the reset vector and turn on MSR_IP. */

	mtspr(SPRN_SRR0, 0xfff00100);

	mtspr(SPRN_SRR1, MSR_IP);



	/* Do an rfi to jump back to firmware. */

	__asm__ __volatile__("rfi" : : : "memory");



	/* 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.

		 */

		cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;



		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,

};