Commit 4c75a6f4 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt Committed by Paul Mackerras
Browse files

[POWERPC] Generic DCR infrastructure 



This patch adds new dcr_map/dcr_read/dcr_write accessors for DCRs that
can be used by drivers to transparently address either native DCRs or
memory mapped DCRs. The implementation for memory mapped DCRs is done
after the binding being currently worked on for SLOF and the Axon
chipset. This patch enables it for the cell native platform

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 69108cf0

arch/powerpc/Kconfig

+16 −0
Original line number Diff line number Diff line
@@ -160,9 +160,11 @@ config PPC_86xx 


config 40x

	bool "AMCC 40x"

	select PPC_DCR_NATIVE



config 44x

	bool "AMCC 44x"

	select PPC_DCR_NATIVE



config 8xx

	bool "Freescale 8xx"
@@ -208,6 +210,19 @@ config PPC_FPU 
	bool

	default y if PPC64



config PPC_DCR_NATIVE

	bool

	default n



config PPC_DCR_MMIO

	bool

	default n



config PPC_DCR

	bool

	depends on PPC_DCR_NATIVE || PPC_DCR_MMIO

	default y



config BOOKE

	bool

	depends on E200 || E500
@@ -453,6 +468,7 @@ config PPC_CELL 
config PPC_CELL_NATIVE

	bool

	select PPC_CELL

	select PPC_DCR_MMIO

	default n



config PPC_IBM_CELL_BLADE

arch/powerpc/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ obj-$(CONFIG_BOOTX_TEXT) += btext.o 
obj-$(CONFIG_SMP)		+= smp.o

obj-$(CONFIG_KPROBES)		+= kprobes.o

obj-$(CONFIG_PPC_UDBG_16550)	+= legacy_serial.o udbg_16550.o



module-$(CONFIG_PPC64)		+= module_64.o

obj-$(CONFIG_MODULES)		+= $(module-y)

arch/powerpc/sysdev/Makefile

+1 −2
Original line number Diff line number Diff line
@@ -5,8 +5,7 @@ endif 
obj-$(CONFIG_MPIC)		+= mpic.o

obj-$(CONFIG_PPC_INDIRECT_PCI)	+= indirect_pci.o

obj-$(CONFIG_PPC_MPC106)	+= grackle.o

obj-$(CONFIG_BOOKE)		+= dcr.o

obj-$(CONFIG_40x)		+= dcr.o

obj-$(CONFIG_PPC_DCR)		+= dcr.o dcr-low.o

obj-$(CONFIG_U3_DART)		+= dart_iommu.o

obj-$(CONFIG_MMIO_NVRAM)	+= mmio_nvram.o

obj-$(CONFIG_FSL_SOC)		+= fsl_soc.o

arch/powerpc/sysdev/dcr-low.S

0 → 100644
+39 −0
Original line number Diff line number Diff line 
/*

 * "Indirect" DCR access

 *

 * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>

 *

 * 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 <asm/ppc_asm.h>

#include <asm/processor.h>



#define DCR_ACCESS_PROLOG(table) \

	rlwinm  r3,r3,4,18,27;   \

	lis     r5,table@h;      \

	ori     r5,r5,table@l;   \

	add     r3,r3,r5;        \

	mtctr   r3;              \

	bctr



_GLOBAL(__mfdcr)

	DCR_ACCESS_PROLOG(__mfdcr_table)



_GLOBAL(__mtdcr)

	DCR_ACCESS_PROLOG(__mtdcr_table)



__mfdcr_table:

	mfdcr  r3,0; blr

__mtdcr_table:

	mtdcr  0,r4; blr



dcr     = 1

        .rept   1023

	mfdcr   r3,dcr; blr

	mtdcr   dcr,r4; blr

	dcr     = dcr + 1

	.endr

arch/powerpc/sysdev/dcr.c

0 → 100644
+137 −0
Original line number Diff line number Diff line 
/*

 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.

 *                    <benh@kernel.crashing.org>

 *

 *   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.

 *

 *   You should have received a copy of the GNU General Public License

 *   along with this program;  if not, write to the Free Software

 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */



#undef DEBUG



#include <linux/kernel.h>

#include <asm/prom.h>

#include <asm/dcr.h>



unsigned int dcr_resource_start(struct device_node *np, unsigned int index)

{

	unsigned int ds;

	const u32 *dr = get_property(np, "dcr-reg", &ds);



	if (dr == NULL || ds & 1 || index >= (ds / 8))

		return 0;



	return dr[index * 2];

}



unsigned int dcr_resource_len(struct device_node *np, unsigned int index)

{

	unsigned int ds;

	const u32 *dr = get_property(np, "dcr-reg", &ds);



	if (dr == NULL || ds & 1 || index >= (ds / 8))

		return 0;



	return dr[index * 2 + 1];

}



#ifndef CONFIG_PPC_DCR_NATIVE



static struct device_node * find_dcr_parent(struct device_node * node)

{

	struct device_node *par, *tmp;

	const u32 *p;



	for (par = of_node_get(node); par;) {

		if (get_property(par, "dcr-controller", NULL))

			break;

		p = get_property(par, "dcr-parent", NULL);

		tmp = par;

		if (p == NULL)

			par = of_get_parent(par);

		else

			par = of_find_node_by_phandle(*p);

		of_node_put(tmp);

	}

	return par;

}



u64 of_translate_dcr_address(struct device_node *dev,

			     unsigned int dcr_n,

			     unsigned int *out_stride)

{

	struct device_node *dp;

	const u32 *p;

	unsigned int stride;

	u64 ret;



	dp = find_dcr_parent(dev);

	if (dp == NULL)

		return OF_BAD_ADDR;



	/* Stride is not properly defined yet, default to 0x10 for Axon */

	p = get_property(dp, "dcr-mmio-stride", NULL);

	stride = (p == NULL) ? 0x10 : *p;



	/* XXX FIXME: Which property name is to use of the 2 following ? */

	p = get_property(dp, "dcr-mmio-range", NULL);

	if (p == NULL)

		p = get_property(dp, "dcr-mmio-space", NULL);

	if (p == NULL)

		return OF_BAD_ADDR;



	/* Maybe could do some better range checking here */

	ret = of_translate_address(dp, p);

	if (ret != OF_BAD_ADDR)

		ret += (u64)(stride) * (u64)dcr_n;

	if (out_stride)

		*out_stride = stride;

	return ret;

}



dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n,

		   unsigned int dcr_c)

{

	dcr_host_t ret = { .token = NULL, .stride = 0 };

	u64 addr;



	pr_debug("dcr_map(%s, 0x%x, 0x%x)\n",

		 dev->full_name, dcr_n, dcr_c);



	addr = of_translate_dcr_address(dev, dcr_n, &ret.stride);

	pr_debug("translates to addr: 0x%lx, stride: 0x%x\n",

		 addr, ret.stride);

	if (addr == OF_BAD_ADDR)

		return ret;

	pr_debug("mapping 0x%x bytes\n", dcr_c * ret.stride);

	ret.token = ioremap(addr, dcr_c * ret.stride);

	if (ret.token == NULL)

		return ret;

	pr_debug("mapped at 0x%p -> base is 0x%p\n",

		 ret.token, ret.token - dcr_n * ret.stride);

	ret.token -= dcr_n * ret.stride;

	return ret;

}



void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c)

{

	dcr_host_t h = host;



	if (h.token == NULL)

		return;

	h.token -= dcr_n * h.stride;

	iounmap(h.token);

	h.token = NULL;

}



#endif /* !defined(CONFIG_PPC_DCR_NATIVE) */

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