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Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +11001/*
2 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#undef DEBUG
21
22#include <linux/kernel.h>
23#include <asm/prom.h>
24#include <asm/dcr.h>
25
26unsigned int dcr_resource_start(struct device_node *np, unsigned int index)
27{
28 unsigned int ds;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +100029 const u32 *dr = of_get_property(np, "dcr-reg", &ds);
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +110030
31 if (dr == NULL || ds & 1 || index >= (ds / 8))
32 return 0;
33
34 return dr[index * 2];
35}
Murali Iyer96b952d2007-08-09 07:46:49 +100036EXPORT_SYMBOL_GPL(dcr_resource_start);
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +110037
38unsigned int dcr_resource_len(struct device_node *np, unsigned int index)
39{
40 unsigned int ds;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +100041 const u32 *dr = of_get_property(np, "dcr-reg", &ds);
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +110042
43 if (dr == NULL || ds & 1 || index >= (ds / 8))
44 return 0;
45
46 return dr[index * 2 + 1];
47}
Murali Iyer96b952d2007-08-09 07:46:49 +100048EXPORT_SYMBOL_GPL(dcr_resource_len);
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +110049
50#ifndef CONFIG_PPC_DCR_NATIVE
51
52static struct device_node * find_dcr_parent(struct device_node * node)
53{
54 struct device_node *par, *tmp;
55 const u32 *p;
56
57 for (par = of_node_get(node); par;) {
Stephen Rothwelle2eb6392007-04-03 22:26:41 +100058 if (of_get_property(par, "dcr-controller", NULL))
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +110059 break;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +100060 p = of_get_property(par, "dcr-parent", NULL);
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +110061 tmp = par;
62 if (p == NULL)
63 par = of_get_parent(par);
64 else
65 par = of_find_node_by_phandle(*p);
66 of_node_put(tmp);
67 }
68 return par;
69}
70
71u64 of_translate_dcr_address(struct device_node *dev,
72 unsigned int dcr_n,
73 unsigned int *out_stride)
74{
75 struct device_node *dp;
76 const u32 *p;
77 unsigned int stride;
78 u64 ret;
79
80 dp = find_dcr_parent(dev);
81 if (dp == NULL)
82 return OF_BAD_ADDR;
83
84 /* Stride is not properly defined yet, default to 0x10 for Axon */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +100085 p = of_get_property(dp, "dcr-mmio-stride", NULL);
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +110086 stride = (p == NULL) ? 0x10 : *p;
87
88 /* XXX FIXME: Which property name is to use of the 2 following ? */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +100089 p = of_get_property(dp, "dcr-mmio-range", NULL);
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +110090 if (p == NULL)
Stephen Rothwelle2eb6392007-04-03 22:26:41 +100091 p = of_get_property(dp, "dcr-mmio-space", NULL);
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +110092 if (p == NULL)
93 return OF_BAD_ADDR;
94
95 /* Maybe could do some better range checking here */
96 ret = of_translate_address(dp, p);
97 if (ret != OF_BAD_ADDR)
98 ret += (u64)(stride) * (u64)dcr_n;
99 if (out_stride)
100 *out_stride = stride;
101 return ret;
102}
103
104dcr_host_t dcr_map(struct device_node *dev, unsigned int dcr_n,
105 unsigned int dcr_c)
106{
Michael Ellerman0b94a1e2007-09-17 16:05:00 +1000107 dcr_host_t ret = { .token = NULL, .stride = 0, .base = dcr_n };
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +1100108 u64 addr;
109
110 pr_debug("dcr_map(%s, 0x%x, 0x%x)\n",
111 dev->full_name, dcr_n, dcr_c);
112
113 addr = of_translate_dcr_address(dev, dcr_n, &ret.stride);
114 pr_debug("translates to addr: 0x%lx, stride: 0x%x\n",
115 addr, ret.stride);
116 if (addr == OF_BAD_ADDR)
117 return ret;
118 pr_debug("mapping 0x%x bytes\n", dcr_c * ret.stride);
119 ret.token = ioremap(addr, dcr_c * ret.stride);
120 if (ret.token == NULL)
121 return ret;
122 pr_debug("mapped at 0x%p -> base is 0x%p\n",
123 ret.token, ret.token - dcr_n * ret.stride);
124 ret.token -= dcr_n * ret.stride;
125 return ret;
126}
Murali Iyer96b952d2007-08-09 07:46:49 +1000127EXPORT_SYMBOL_GPL(dcr_map);
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +1100128
129void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c)
130{
131 dcr_host_t h = host;
132
133 if (h.token == NULL)
134 return;
Jean-Christophe Dubois190a4402007-03-28 11:07:41 +0100135 h.token += dcr_n * h.stride;
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +1100136 iounmap(h.token);
137 h.token = NULL;
138}
Murali Iyer96b952d2007-08-09 07:46:49 +1000139EXPORT_SYMBOL_GPL(dcr_unmap);
Benjamin Herrenschmidt4c75a6f2006-11-11 17:24:53 +1100140
141#endif /* !defined(CONFIG_PPC_DCR_NATIVE) */