This source file includes following definitions.
- find_dcr_parent
- dcr_map_ok_generic
- dcr_map_generic
- dcr_unmap_generic
- dcr_read_generic
- dcr_write_generic
- dcr_resource_start
- dcr_resource_len
- of_translate_dcr_address
- dcr_map_mmio
- dcr_unmap_mmio
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6
7 #undef DEBUG
8
9 #include <linux/kernel.h>
10 #include <linux/export.h>
11 #include <asm/prom.h>
12 #include <asm/dcr.h>
13
14 #ifdef CONFIG_PPC_DCR_MMIO
15 static struct device_node *find_dcr_parent(struct device_node *node)
16 {
17 struct device_node *par, *tmp;
18 const u32 *p;
19
20 for (par = of_node_get(node); par;) {
21 if (of_get_property(par, "dcr-controller", NULL))
22 break;
23 p = of_get_property(par, "dcr-parent", NULL);
24 tmp = par;
25 if (p == NULL)
26 par = of_get_parent(par);
27 else
28 par = of_find_node_by_phandle(*p);
29 of_node_put(tmp);
30 }
31 return par;
32 }
33 #endif
34
35 #if defined(CONFIG_PPC_DCR_NATIVE) && defined(CONFIG_PPC_DCR_MMIO)
36
37 bool dcr_map_ok_generic(dcr_host_t host)
38 {
39 if (host.type == DCR_HOST_NATIVE)
40 return dcr_map_ok_native(host.host.native);
41 else if (host.type == DCR_HOST_MMIO)
42 return dcr_map_ok_mmio(host.host.mmio);
43 else
44 return false;
45 }
46 EXPORT_SYMBOL_GPL(dcr_map_ok_generic);
47
48 dcr_host_t dcr_map_generic(struct device_node *dev,
49 unsigned int dcr_n,
50 unsigned int dcr_c)
51 {
52 dcr_host_t host;
53 struct device_node *dp;
54 const char *prop;
55
56 host.type = DCR_HOST_INVALID;
57
58 dp = find_dcr_parent(dev);
59 if (dp == NULL)
60 return host;
61
62 prop = of_get_property(dp, "dcr-access-method", NULL);
63
64 pr_debug("dcr_map_generic(dcr-access-method = %s)\n", prop);
65
66 if (!strcmp(prop, "native")) {
67 host.type = DCR_HOST_NATIVE;
68 host.host.native = dcr_map_native(dev, dcr_n, dcr_c);
69 } else if (!strcmp(prop, "mmio")) {
70 host.type = DCR_HOST_MMIO;
71 host.host.mmio = dcr_map_mmio(dev, dcr_n, dcr_c);
72 }
73
74 of_node_put(dp);
75 return host;
76 }
77 EXPORT_SYMBOL_GPL(dcr_map_generic);
78
79 void dcr_unmap_generic(dcr_host_t host, unsigned int dcr_c)
80 {
81 if (host.type == DCR_HOST_NATIVE)
82 dcr_unmap_native(host.host.native, dcr_c);
83 else if (host.type == DCR_HOST_MMIO)
84 dcr_unmap_mmio(host.host.mmio, dcr_c);
85 else
86 WARN_ON(true);
87 }
88 EXPORT_SYMBOL_GPL(dcr_unmap_generic);
89
90 u32 dcr_read_generic(dcr_host_t host, unsigned int dcr_n)
91 {
92 if (host.type == DCR_HOST_NATIVE)
93 return dcr_read_native(host.host.native, dcr_n);
94 else if (host.type == DCR_HOST_MMIO)
95 return dcr_read_mmio(host.host.mmio, dcr_n);
96 else
97 WARN_ON(true);
98 return 0;
99 }
100 EXPORT_SYMBOL_GPL(dcr_read_generic);
101
102 void dcr_write_generic(dcr_host_t host, unsigned int dcr_n, u32 value)
103 {
104 if (host.type == DCR_HOST_NATIVE)
105 dcr_write_native(host.host.native, dcr_n, value);
106 else if (host.type == DCR_HOST_MMIO)
107 dcr_write_mmio(host.host.mmio, dcr_n, value);
108 else
109 WARN_ON(true);
110 }
111 EXPORT_SYMBOL_GPL(dcr_write_generic);
112
113 #endif
114
115 unsigned int dcr_resource_start(const struct device_node *np,
116 unsigned int index)
117 {
118 unsigned int ds;
119 const u32 *dr = of_get_property(np, "dcr-reg", &ds);
120
121 if (dr == NULL || ds & 1 || index >= (ds / 8))
122 return 0;
123
124 return dr[index * 2];
125 }
126 EXPORT_SYMBOL_GPL(dcr_resource_start);
127
128 unsigned int dcr_resource_len(const struct device_node *np, unsigned int index)
129 {
130 unsigned int ds;
131 const u32 *dr = of_get_property(np, "dcr-reg", &ds);
132
133 if (dr == NULL || ds & 1 || index >= (ds / 8))
134 return 0;
135
136 return dr[index * 2 + 1];
137 }
138 EXPORT_SYMBOL_GPL(dcr_resource_len);
139
140 #ifdef CONFIG_PPC_DCR_MMIO
141
142 static u64 of_translate_dcr_address(struct device_node *dev,
143 unsigned int dcr_n,
144 unsigned int *out_stride)
145 {
146 struct device_node *dp;
147 const u32 *p;
148 unsigned int stride;
149 u64 ret = OF_BAD_ADDR;
150
151 dp = find_dcr_parent(dev);
152 if (dp == NULL)
153 return OF_BAD_ADDR;
154
155
156 p = of_get_property(dp, "dcr-mmio-stride", NULL);
157 stride = (p == NULL) ? 0x10 : *p;
158
159
160 p = of_get_property(dp, "dcr-mmio-range", NULL);
161 if (p == NULL)
162 p = of_get_property(dp, "dcr-mmio-space", NULL);
163 if (p == NULL)
164 goto done;
165
166
167 ret = of_translate_address(dp, p);
168 if (ret != OF_BAD_ADDR)
169 ret += (u64)(stride) * (u64)dcr_n;
170 if (out_stride)
171 *out_stride = stride;
172
173 done:
174 of_node_put(dp);
175 return ret;
176 }
177
178 dcr_host_mmio_t dcr_map_mmio(struct device_node *dev,
179 unsigned int dcr_n,
180 unsigned int dcr_c)
181 {
182 dcr_host_mmio_t ret = { .token = NULL, .stride = 0, .base = dcr_n };
183 u64 addr;
184
185 pr_debug("dcr_map(%pOF, 0x%x, 0x%x)\n",
186 dev, dcr_n, dcr_c);
187
188 addr = of_translate_dcr_address(dev, dcr_n, &ret.stride);
189 pr_debug("translates to addr: 0x%llx, stride: 0x%x\n",
190 (unsigned long long) addr, ret.stride);
191 if (addr == OF_BAD_ADDR)
192 return ret;
193 pr_debug("mapping 0x%x bytes\n", dcr_c * ret.stride);
194 ret.token = ioremap(addr, dcr_c * ret.stride);
195 if (ret.token == NULL)
196 return ret;
197 pr_debug("mapped at 0x%p -> base is 0x%p\n",
198 ret.token, ret.token - dcr_n * ret.stride);
199 ret.token -= dcr_n * ret.stride;
200 return ret;
201 }
202 EXPORT_SYMBOL_GPL(dcr_map_mmio);
203
204 void dcr_unmap_mmio(dcr_host_mmio_t host, unsigned int dcr_c)
205 {
206 dcr_host_mmio_t h = host;
207
208 if (h.token == NULL)
209 return;
210 h.token += host.base * h.stride;
211 iounmap(h.token);
212 h.token = NULL;
213 }
214 EXPORT_SYMBOL_GPL(dcr_unmap_mmio);
215
216 #endif
217
218 #ifdef CONFIG_PPC_DCR_NATIVE
219 DEFINE_SPINLOCK(dcr_ind_lock);
220 EXPORT_SYMBOL_GPL(dcr_ind_lock);
221 #endif
222