![Grant Likely](/assets/img/avatar_default.png)
There is now a way to ensure all platform devices get a unique name when populated from the device tree, and the DCR_NATIVE code path is broken anyway. PowerPC Cell (PS3) is the only platform that actually uses this path. Most likely nobody will notice if it is killed. Remove the code and associated ugly #ifdef. The user-visible impact of this patch is that any DCR device on Cell will get a new name in the /sys/devices hierarchy. Signed-off-by: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <robh@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
235 lines
6 KiB
C
235 lines
6 KiB
C
/*
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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 <linux/export.h>
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#include <asm/prom.h>
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#include <asm/dcr.h>
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#ifdef CONFIG_PPC_DCR_MMIO
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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 (of_get_property(par, "dcr-controller", NULL))
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break;
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p = of_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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#endif
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#if defined(CONFIG_PPC_DCR_NATIVE) && defined(CONFIG_PPC_DCR_MMIO)
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bool dcr_map_ok_generic(dcr_host_t host)
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{
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if (host.type == DCR_HOST_NATIVE)
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return dcr_map_ok_native(host.host.native);
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else if (host.type == DCR_HOST_MMIO)
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return dcr_map_ok_mmio(host.host.mmio);
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else
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return 0;
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}
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EXPORT_SYMBOL_GPL(dcr_map_ok_generic);
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dcr_host_t dcr_map_generic(struct device_node *dev,
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unsigned int dcr_n,
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unsigned int dcr_c)
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{
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dcr_host_t host;
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struct device_node *dp;
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const char *prop;
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host.type = DCR_HOST_INVALID;
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dp = find_dcr_parent(dev);
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if (dp == NULL)
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return host;
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prop = of_get_property(dp, "dcr-access-method", NULL);
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pr_debug("dcr_map_generic(dcr-access-method = %s)\n", prop);
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if (!strcmp(prop, "native")) {
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host.type = DCR_HOST_NATIVE;
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host.host.native = dcr_map_native(dev, dcr_n, dcr_c);
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} else if (!strcmp(prop, "mmio")) {
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host.type = DCR_HOST_MMIO;
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host.host.mmio = dcr_map_mmio(dev, dcr_n, dcr_c);
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}
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of_node_put(dp);
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return host;
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}
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EXPORT_SYMBOL_GPL(dcr_map_generic);
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void dcr_unmap_generic(dcr_host_t host, unsigned int dcr_c)
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{
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if (host.type == DCR_HOST_NATIVE)
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dcr_unmap_native(host.host.native, dcr_c);
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else if (host.type == DCR_HOST_MMIO)
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dcr_unmap_mmio(host.host.mmio, dcr_c);
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else /* host.type == DCR_HOST_INVALID */
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WARN_ON(true);
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}
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EXPORT_SYMBOL_GPL(dcr_unmap_generic);
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u32 dcr_read_generic(dcr_host_t host, unsigned int dcr_n)
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{
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if (host.type == DCR_HOST_NATIVE)
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return dcr_read_native(host.host.native, dcr_n);
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else if (host.type == DCR_HOST_MMIO)
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return dcr_read_mmio(host.host.mmio, dcr_n);
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else /* host.type == DCR_HOST_INVALID */
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WARN_ON(true);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dcr_read_generic);
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void dcr_write_generic(dcr_host_t host, unsigned int dcr_n, u32 value)
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{
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if (host.type == DCR_HOST_NATIVE)
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dcr_write_native(host.host.native, dcr_n, value);
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else if (host.type == DCR_HOST_MMIO)
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dcr_write_mmio(host.host.mmio, dcr_n, value);
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else /* host.type == DCR_HOST_INVALID */
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WARN_ON(true);
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}
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EXPORT_SYMBOL_GPL(dcr_write_generic);
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#endif /* defined(CONFIG_PPC_DCR_NATIVE) && defined(CONFIG_PPC_DCR_MMIO) */
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unsigned int dcr_resource_start(const struct device_node *np,
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unsigned int index)
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{
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unsigned int ds;
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const u32 *dr = of_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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EXPORT_SYMBOL_GPL(dcr_resource_start);
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unsigned int dcr_resource_len(const 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 = of_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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EXPORT_SYMBOL_GPL(dcr_resource_len);
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#ifdef CONFIG_PPC_DCR_MMIO
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static 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 = OF_BAD_ADDR;
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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 = of_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 = of_get_property(dp, "dcr-mmio-range", NULL);
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if (p == NULL)
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p = of_get_property(dp, "dcr-mmio-space", NULL);
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if (p == NULL)
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goto done;
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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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done:
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of_node_put(dp);
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return ret;
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}
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dcr_host_mmio_t dcr_map_mmio(struct device_node *dev,
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unsigned int dcr_n,
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unsigned int dcr_c)
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{
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dcr_host_mmio_t ret = { .token = NULL, .stride = 0, .base = dcr_n };
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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%llx, stride: 0x%x\n",
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(unsigned long long) 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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EXPORT_SYMBOL_GPL(dcr_map_mmio);
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void dcr_unmap_mmio(dcr_host_mmio_t host, unsigned int dcr_c)
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{
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dcr_host_mmio_t h = host;
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if (h.token == NULL)
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return;
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h.token += host.base * h.stride;
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iounmap(h.token);
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h.token = NULL;
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}
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EXPORT_SYMBOL_GPL(dcr_unmap_mmio);
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#endif /* defined(CONFIG_PPC_DCR_MMIO) */
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#ifdef CONFIG_PPC_DCR_NATIVE
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DEFINE_SPINLOCK(dcr_ind_lock);
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#endif /* defined(CONFIG_PPC_DCR_NATIVE) */
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