[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: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
Paul Mackerras
parent
69108cf006
commit
4c75a6f441
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@ -160,9 +160,11 @@ config PPC_86xx
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config 40x
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bool "AMCC 40x"
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select PPC_DCR_NATIVE
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config 44x
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bool "AMCC 44x"
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select PPC_DCR_NATIVE
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config 8xx
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bool "Freescale 8xx"
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@ -208,6 +210,19 @@ config PPC_FPU
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bool
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default y if PPC64
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config PPC_DCR_NATIVE
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bool
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default n
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config PPC_DCR_MMIO
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bool
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default n
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config PPC_DCR
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bool
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depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
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default y
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config BOOKE
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bool
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depends on E200 || E500
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@ -453,6 +468,7 @@ config PPC_CELL
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config PPC_CELL_NATIVE
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bool
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select PPC_CELL
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select PPC_DCR_MMIO
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default n
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config PPC_IBM_CELL_BLADE
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@ -58,6 +58,7 @@ obj-$(CONFIG_BOOTX_TEXT) += btext.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_PPC_UDBG_16550) += legacy_serial.o udbg_16550.o
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module-$(CONFIG_PPC64) += module_64.o
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obj-$(CONFIG_MODULES) += $(module-y)
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@ -5,8 +5,7 @@ endif
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obj-$(CONFIG_MPIC) += mpic.o
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obj-$(CONFIG_PPC_INDIRECT_PCI) += indirect_pci.o
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obj-$(CONFIG_PPC_MPC106) += grackle.o
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obj-$(CONFIG_BOOKE) += dcr.o
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obj-$(CONFIG_40x) += dcr.o
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obj-$(CONFIG_PPC_DCR) += dcr.o dcr-low.o
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obj-$(CONFIG_U3_DART) += dart_iommu.o
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obj-$(CONFIG_MMIO_NVRAM) += mmio_nvram.o
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obj-$(CONFIG_FSL_SOC) += fsl_soc.o
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@ -0,0 +1,39 @@
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/*
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* "Indirect" DCR access
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*
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* Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <asm/ppc_asm.h>
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#include <asm/processor.h>
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#define DCR_ACCESS_PROLOG(table) \
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rlwinm r3,r3,4,18,27; \
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lis r5,table@h; \
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ori r5,r5,table@l; \
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add r3,r3,r5; \
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mtctr r3; \
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bctr
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_GLOBAL(__mfdcr)
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DCR_ACCESS_PROLOG(__mfdcr_table)
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_GLOBAL(__mtdcr)
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DCR_ACCESS_PROLOG(__mtdcr_table)
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__mfdcr_table:
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mfdcr r3,0; blr
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__mtdcr_table:
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mtdcr 0,r4; blr
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dcr = 1
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.rept 1023
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mfdcr r3,dcr; blr
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mtdcr dcr,r4; blr
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dcr = dcr + 1
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.endr
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@ -0,0 +1,137 @@
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/*
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* (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <asm/prom.h>
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#include <asm/dcr.h>
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unsigned int dcr_resource_start(struct device_node *np, unsigned int index)
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{
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unsigned int ds;
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const u32 *dr = get_property(np, "dcr-reg", &ds);
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if (dr == NULL || ds & 1 || index >= (ds / 8))
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return 0;
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return dr[index * 2];
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}
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unsigned int dcr_resource_len(struct device_node *np, unsigned int index)
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{
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unsigned int ds;
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const u32 *dr = get_property(np, "dcr-reg", &ds);
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if (dr == NULL || ds & 1 || index >= (ds / 8))
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return 0;
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return dr[index * 2 + 1];
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}
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#ifndef CONFIG_PPC_DCR_NATIVE
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static struct device_node * find_dcr_parent(struct device_node * node)
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{
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struct device_node *par, *tmp;
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const u32 *p;
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for (par = of_node_get(node); par;) {
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if (get_property(par, "dcr-controller", NULL))
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break;
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p = get_property(par, "dcr-parent", NULL);
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tmp = par;
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if (p == NULL)
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par = of_get_parent(par);
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else
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par = of_find_node_by_phandle(*p);
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of_node_put(tmp);
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}
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return par;
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}
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u64 of_translate_dcr_address(struct device_node *dev,
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unsigned int dcr_n,
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unsigned int *out_stride)
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{
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struct device_node *dp;
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const u32 *p;
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unsigned int stride;
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u64 ret;
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dp = find_dcr_parent(dev);
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if (dp == NULL)
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return OF_BAD_ADDR;
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/* Stride is not properly defined yet, default to 0x10 for Axon */
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p = get_property(dp, "dcr-mmio-stride", NULL);
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stride = (p == NULL) ? 0x10 : *p;
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/* XXX FIXME: Which property name is to use of the 2 following ? */
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p = get_property(dp, "dcr-mmio-range", NULL);
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if (p == NULL)
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p = get_property(dp, "dcr-mmio-space", NULL);
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if (p == NULL)
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return OF_BAD_ADDR;
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/* Maybe could do some better range checking here */
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ret = of_translate_address(dp, p);
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if (ret != OF_BAD_ADDR)
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ret += (u64)(stride) * (u64)dcr_n;
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if (out_stride)
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*out_stride = stride;
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return ret;
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}
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dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n,
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unsigned int dcr_c)
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{
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dcr_host_t ret = { .token = NULL, .stride = 0 };
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u64 addr;
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pr_debug("dcr_map(%s, 0x%x, 0x%x)\n",
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dev->full_name, dcr_n, dcr_c);
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addr = of_translate_dcr_address(dev, dcr_n, &ret.stride);
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pr_debug("translates to addr: 0x%lx, stride: 0x%x\n",
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addr, ret.stride);
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if (addr == OF_BAD_ADDR)
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return ret;
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pr_debug("mapping 0x%x bytes\n", dcr_c * ret.stride);
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ret.token = ioremap(addr, dcr_c * ret.stride);
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if (ret.token == NULL)
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return ret;
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pr_debug("mapped at 0x%p -> base is 0x%p\n",
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ret.token, ret.token - dcr_n * ret.stride);
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ret.token -= dcr_n * ret.stride;
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return ret;
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}
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void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c)
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{
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dcr_host_t h = host;
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if (h.token == NULL)
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return;
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h.token -= dcr_n * h.stride;
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iounmap(h.token);
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h.token = NULL;
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}
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#endif /* !defined(CONFIG_PPC_DCR_NATIVE) */
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@ -77,9 +77,11 @@ config 6xx
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config 40x
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bool "40x"
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select PPC_DCR_NATIVE
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config 44x
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bool "44x"
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select PPC_DCR_NATIVE
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config 8xx
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bool "8xx"
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@ -95,6 +97,15 @@ endchoice
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config PPC_FPU
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bool
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config PPC_DCR_NATIVE
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bool
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default n
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config PPC_DCR
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bool
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depends on PPC_DCR_NATIVE
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default y
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config BOOKE
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bool
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depends on E200 || E500
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@ -0,0 +1,51 @@
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/*
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* (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ASM_POWERPC_DCR_MMIO_H
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#define _ASM_POWERPC_DCR_MMIO_H
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#ifdef __KERNEL__
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#include <asm/io.h>
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typedef struct { void __iomem *token; unsigned int stride; } dcr_host_t;
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#define DCR_MAP_OK(host) ((host).token != NULL)
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extern dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n,
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unsigned int dcr_c);
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extern void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c);
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static inline u32 dcr_read(dcr_host_t host, unsigned int dcr_n)
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{
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return in_be32(host.token + dcr_n * host.stride);
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}
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static inline void dcr_write(dcr_host_t host, unsigned int dcr_n, u32 value)
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{
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out_be32(host.token + dcr_n * host.stride, value);
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}
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extern u64 of_translate_dcr_address(struct device_node *dev,
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unsigned int dcr_n,
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unsigned int *stride);
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_DCR_MMIO_H */
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@ -0,0 +1,39 @@
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/*
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* (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ASM_POWERPC_DCR_NATIVE_H
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#define _ASM_POWERPC_DCR_NATIVE_H
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#ifdef __KERNEL__
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#include <asm/reg.h>
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typedef struct {} dcr_host_t;
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#define DCR_MAP_OK(host) (1)
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#define dcr_map(dev, dcr_n, dcr_c) {}
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#define dcr_unmap(host, dcr_n, dcr_c) {}
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#define dcr_read(host, dcr_n) mfdcr(dcr_n)
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#define dcr_write(host, dcr_n, value) mtdcr(dcr_n, value)
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_DCR_NATIVE_H */
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@ -0,0 +1,42 @@
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/*
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* (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ASM_POWERPC_DCR_H
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#define _ASM_POWERPC_DCR_H
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#ifdef __KERNEL__
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#ifdef CONFIG_PPC_DCR_NATIVE
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#include <asm/dcr-native.h>
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#else
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#include <asm/dcr-mmio.h>
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#endif
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/*
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* On CONFIG_PPC_MERGE, we have additional helpers to read the DCR
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* base from the device-tree
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*/
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#ifdef CONFIG_PPC_MERGE
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extern unsigned int dcr_resource_start(struct device_node *np,
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unsigned int index);
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extern unsigned int dcr_resource_len(struct device_node *np,
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unsigned int index);
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#endif /* CONFIG_PPC_MERGE */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_DCR_H */
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