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1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/types.h>
3#include <linux/ioport.h>
4#include <linux/slab.h>
5#include <linux/export.h>
6#include <linux/io.h>
7#include <linux/mcb.h>
8
9#include "mcb-internal.h"
10
11struct mcb_parse_priv {
12 phys_addr_t mapbase;
13 void __iomem *base;
14};
15
16#define for_each_chameleon_cell(dtype, p) \
17 for ((dtype) = get_next_dtype((p)); \
18 (dtype) != CHAMELEON_DTYPE_END; \
19 (dtype) = get_next_dtype((p)))
20
21static inline uint32_t get_next_dtype(void __iomem *p)
22{
23 uint32_t dtype;
24
25 dtype = readl(p);
26 return dtype >> 28;
27}
28
29static int chameleon_parse_bdd(struct mcb_bus *bus,
30 struct chameleon_bar *cb,
31 void __iomem *base)
32{
33 return 0;
34}
35
36static int chameleon_parse_gdd(struct mcb_bus *bus,
37 struct chameleon_bar *cb,
38 void __iomem *base, int bar_count)
39{
40 struct chameleon_gdd __iomem *gdd =
41 (struct chameleon_gdd __iomem *) base;
42 struct mcb_device *mdev;
43 u32 dev_mapbase;
44 u32 offset;
45 u32 size;
46 int ret;
47 __le32 reg1;
48 __le32 reg2;
49
50 mdev = mcb_alloc_dev(bus);
51 if (!mdev)
52 return -ENOMEM;
53
54 reg1 = readl(&gdd->reg1);
55 reg2 = readl(&gdd->reg2);
56 offset = readl(&gdd->offset);
57 size = readl(&gdd->size);
58
59 mdev->id = GDD_DEV(reg1);
60 mdev->rev = GDD_REV(reg1);
61 mdev->var = GDD_VAR(reg1);
62 mdev->bar = GDD_BAR(reg2);
63 mdev->group = GDD_GRP(reg2);
64 mdev->inst = GDD_INS(reg2);
65
66 /*
67 * If the BAR is missing, dev_mapbase is zero, or if the
68 * device is IO mapped we just print a warning and go on with the
69 * next device, instead of completely stop the gdd parser
70 */
71 if (mdev->bar > bar_count - 1) {
72 pr_info("No BAR for 16z%03d\n", mdev->id);
73 ret = 0;
74 goto err;
75 }
76
77 dev_mapbase = cb[mdev->bar].addr;
78 if (!dev_mapbase) {
79 pr_info("BAR not assigned for 16z%03d\n", mdev->id);
80 ret = 0;
81 goto err;
82 }
83
84 if (dev_mapbase & 0x01) {
85 pr_info("IO mapped Device (16z%03d) not yet supported\n",
86 mdev->id);
87 ret = 0;
88 goto err;
89 }
90
91 pr_debug("Found a 16z%03d\n", mdev->id);
92
93 mdev->irq.start = GDD_IRQ(reg1);
94 mdev->irq.end = GDD_IRQ(reg1);
95 mdev->irq.flags = IORESOURCE_IRQ;
96
97 mdev->mem.start = dev_mapbase + offset;
98
99 mdev->mem.end = mdev->mem.start + size - 1;
100 mdev->mem.flags = IORESOURCE_MEM;
101
102 ret = mcb_device_register(bus, mdev);
103 if (ret < 0)
104 goto err;
105
106 return 0;
107
108err:
109 mcb_free_dev(mdev);
110
111 return ret;
112}
113
114static void chameleon_parse_bar(void __iomem *base,
115 struct chameleon_bar *cb, int bar_count)
116{
117 char __iomem *p = base;
118 int i;
119
120 /* skip reg1 */
121 p += sizeof(__le32);
122
123 for (i = 0; i < bar_count; i++) {
124 cb[i].addr = readl(p);
125 cb[i].size = readl(p + 4);
126
127 p += sizeof(struct chameleon_bar);
128 }
129}
130
131static int chameleon_get_bar(void __iomem **base, phys_addr_t mapbase,
132 struct chameleon_bar **cb)
133{
134 struct chameleon_bar *c;
135 int bar_count;
136 __le32 reg;
137 u32 dtype;
138
139 /*
140 * For those devices which are not connected
141 * to the PCI Bus (e.g. LPC) there is a bar
142 * descriptor located directly after the
143 * chameleon header. This header is comparable
144 * to a PCI header.
145 */
146 dtype = get_next_dtype(*base);
147 if (dtype == CHAMELEON_DTYPE_BAR) {
148 reg = readl(*base);
149
150 bar_count = BAR_CNT(reg);
151 if (bar_count <= 0 || bar_count > CHAMELEON_BAR_MAX)
152 return -ENODEV;
153
154 c = kcalloc(bar_count, sizeof(struct chameleon_bar),
155 GFP_KERNEL);
156 if (!c)
157 return -ENOMEM;
158
159 chameleon_parse_bar(*base, c, bar_count);
160 *base += BAR_DESC_SIZE(bar_count);
161 } else {
162 c = kzalloc(sizeof(struct chameleon_bar), GFP_KERNEL);
163 if (!c)
164 return -ENOMEM;
165
166 bar_count = 1;
167 c->addr = mapbase;
168 }
169
170 *cb = c;
171
172 return bar_count;
173}
174
175int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
176 void __iomem *base)
177{
178 struct chameleon_fpga_header *header;
179 struct chameleon_bar *cb;
180 void __iomem *p = base;
181 int num_cells = 0;
182 uint32_t dtype;
183 int bar_count;
184 int ret;
185 u32 hsize;
186 u32 table_size;
187
188 hsize = sizeof(struct chameleon_fpga_header);
189
190 header = kzalloc(hsize, GFP_KERNEL);
191 if (!header)
192 return -ENOMEM;
193
194 /* Extract header information */
195 memcpy_fromio(header, p, hsize);
196 /* We only support chameleon v2 at the moment */
197 header->magic = le16_to_cpu(header->magic);
198 if (header->magic != CHAMELEONV2_MAGIC) {
199 pr_err("Unsupported chameleon version 0x%x\n",
200 header->magic);
201 ret = -ENODEV;
202 goto free_header;
203 }
204 p += hsize;
205
206 bus->revision = header->revision;
207 bus->model = header->model;
208 bus->minor = header->minor;
209 snprintf(bus->name, CHAMELEON_FILENAME_LEN + 1, "%s",
210 header->filename);
211
212 bar_count = chameleon_get_bar(&p, mapbase, &cb);
213 if (bar_count < 0) {
214 ret = bar_count;
215 goto free_header;
216 }
217
218 for_each_chameleon_cell(dtype, p) {
219 switch (dtype) {
220 case CHAMELEON_DTYPE_GENERAL:
221 ret = chameleon_parse_gdd(bus, cb, p, bar_count);
222 if (ret < 0)
223 goto free_bar;
224 p += sizeof(struct chameleon_gdd);
225 break;
226 case CHAMELEON_DTYPE_BRIDGE:
227 chameleon_parse_bdd(bus, cb, p);
228 p += sizeof(struct chameleon_bdd);
229 break;
230 case CHAMELEON_DTYPE_END:
231 break;
232 default:
233 pr_err("Invalid chameleon descriptor type 0x%x\n",
234 dtype);
235 ret = -EINVAL;
236 goto free_bar;
237 }
238 num_cells++;
239 }
240
241 if (num_cells == 0) {
242 ret = -EINVAL;
243 goto free_bar;
244 }
245
246 table_size = p - base;
247 pr_debug("%d cell(s) found. Chameleon table size: 0x%04x bytes\n", num_cells, table_size);
248 kfree(cb);
249 kfree(header);
250 return table_size;
251
252free_bar:
253 kfree(cb);
254free_header:
255 kfree(header);
256
257 return ret;
258}
259EXPORT_SYMBOL_NS_GPL(chameleon_parse_cells, MCB);
1#include <linux/types.h>
2#include <linux/ioport.h>
3#include <linux/slab.h>
4#include <linux/export.h>
5#include <linux/io.h>
6#include <linux/mcb.h>
7
8#include "mcb-internal.h"
9
10struct mcb_parse_priv {
11 phys_addr_t mapbase;
12 void __iomem *base;
13};
14
15#define for_each_chameleon_cell(dtype, p) \
16 for ((dtype) = get_next_dtype((p)); \
17 (dtype) != CHAMELEON_DTYPE_END; \
18 (dtype) = get_next_dtype((p)))
19
20static inline uint32_t get_next_dtype(void __iomem *p)
21{
22 uint32_t dtype;
23
24 dtype = readl(p);
25 return dtype >> 28;
26}
27
28static int chameleon_parse_bdd(struct mcb_bus *bus,
29 phys_addr_t mapbase,
30 void __iomem *base)
31{
32 return 0;
33}
34
35static int chameleon_parse_gdd(struct mcb_bus *bus,
36 phys_addr_t mapbase,
37 void __iomem *base)
38{
39 struct chameleon_gdd __iomem *gdd =
40 (struct chameleon_gdd __iomem *) base;
41 struct mcb_device *mdev;
42 u32 offset;
43 u32 size;
44 int ret;
45 __le32 reg1;
46 __le32 reg2;
47
48 mdev = mcb_alloc_dev(bus);
49 if (!mdev)
50 return -ENOMEM;
51
52 reg1 = readl(&gdd->reg1);
53 reg2 = readl(&gdd->reg2);
54 offset = readl(&gdd->offset);
55 size = readl(&gdd->size);
56
57 mdev->id = GDD_DEV(reg1);
58 mdev->rev = GDD_REV(reg1);
59 mdev->var = GDD_VAR(reg1);
60 mdev->bar = GDD_BAR(reg1);
61 mdev->group = GDD_GRP(reg2);
62 mdev->inst = GDD_INS(reg2);
63
64 pr_debug("Found a 16z%03d\n", mdev->id);
65
66 mdev->irq.start = GDD_IRQ(reg1);
67 mdev->irq.end = GDD_IRQ(reg1);
68 mdev->irq.flags = IORESOURCE_IRQ;
69
70 mdev->mem.start = mapbase + offset;
71 mdev->mem.end = mdev->mem.start + size - 1;
72 mdev->mem.flags = IORESOURCE_MEM;
73
74 mdev->is_added = false;
75
76 ret = mcb_device_register(bus, mdev);
77 if (ret < 0)
78 goto err;
79
80 return 0;
81
82err:
83 mcb_free_dev(mdev);
84
85 return ret;
86}
87
88int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
89 void __iomem *base)
90{
91 char __iomem *p = base;
92 struct chameleon_fpga_header *header;
93 uint32_t dtype;
94 int num_cells = 0;
95 int ret = 0;
96 u32 hsize;
97
98 hsize = sizeof(struct chameleon_fpga_header);
99
100 header = kzalloc(hsize, GFP_KERNEL);
101 if (!header)
102 return -ENOMEM;
103
104 /* Extract header information */
105 memcpy_fromio(header, p, hsize);
106 /* We only support chameleon v2 at the moment */
107 header->magic = le16_to_cpu(header->magic);
108 if (header->magic != CHAMELEONV2_MAGIC) {
109 pr_err("Unsupported chameleon version 0x%x\n",
110 header->magic);
111 kfree(header);
112 return -ENODEV;
113 }
114 p += hsize;
115
116 pr_debug("header->revision = %d\n", header->revision);
117 pr_debug("header->model = 0x%x ('%c')\n", header->model,
118 header->model);
119 pr_debug("header->minor = %d\n", header->minor);
120 pr_debug("header->bus_type = 0x%x\n", header->bus_type);
121
122
123 pr_debug("header->magic = 0x%x\n", header->magic);
124 pr_debug("header->filename = \"%.*s\"\n", CHAMELEON_FILENAME_LEN,
125 header->filename);
126
127 for_each_chameleon_cell(dtype, p) {
128 switch (dtype) {
129 case CHAMELEON_DTYPE_GENERAL:
130 ret = chameleon_parse_gdd(bus, mapbase, p);
131 if (ret < 0)
132 goto out;
133 p += sizeof(struct chameleon_gdd);
134 break;
135 case CHAMELEON_DTYPE_BRIDGE:
136 chameleon_parse_bdd(bus, mapbase, p);
137 p += sizeof(struct chameleon_bdd);
138 break;
139 case CHAMELEON_DTYPE_END:
140 break;
141 default:
142 pr_err("Invalid chameleon descriptor type 0x%x\n",
143 dtype);
144 kfree(header);
145 return -EINVAL;
146 }
147 num_cells++;
148 }
149
150 if (num_cells == 0)
151 num_cells = -EINVAL;
152
153 kfree(header);
154 return num_cells;
155
156out:
157 kfree(header);
158 return ret;
159}
160EXPORT_SYMBOL_GPL(chameleon_parse_cells);