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>
9 #include "mcb-internal.h"
11 struct mcb_parse_priv {
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)))
21 static inline uint32_t get_next_dtype(void __iomem *p)
29 static int chameleon_parse_bdd(struct mcb_bus *bus,
30 struct chameleon_bar *cb,
36 static int chameleon_parse_gdd(struct mcb_bus *bus,
37 struct chameleon_bar *cb,
38 void __iomem *base, int bar_count)
40 struct chameleon_gdd __iomem *gdd =
41 (struct chameleon_gdd __iomem *) base;
42 struct mcb_device *mdev;
50 mdev = mcb_alloc_dev(bus);
54 reg1 = readl(&gdd->reg1);
55 reg2 = readl(&gdd->reg2);
56 offset = readl(&gdd->offset);
57 size = readl(&gdd->size);
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);
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
71 if (mdev->bar > bar_count - 1) {
72 pr_info("No BAR for 16z%03d\n", mdev->id);
77 dev_mapbase = cb[mdev->bar].addr;
79 pr_info("BAR not assigned for 16z%03d\n", mdev->id);
84 if (dev_mapbase & 0x01) {
85 pr_info("IO mapped Device (16z%03d) not yet supported\n",
91 pr_debug("Found a 16z%03d\n", mdev->id);
93 mdev->irq.start = GDD_IRQ(reg1);
94 mdev->irq.end = GDD_IRQ(reg1);
95 mdev->irq.flags = IORESOURCE_IRQ;
97 mdev->mem.start = dev_mapbase + offset;
99 mdev->mem.end = mdev->mem.start + size - 1;
100 mdev->mem.flags = IORESOURCE_MEM;
102 ret = mcb_device_register(bus, mdev);
109 put_device(&mdev->dev);
114 static void chameleon_parse_bar(void __iomem *base,
115 struct chameleon_bar *cb, int bar_count)
117 char __iomem *p = base;
123 for (i = 0; i < bar_count; i++) {
124 cb[i].addr = readl(p);
125 cb[i].size = readl(p + 4);
127 p += sizeof(struct chameleon_bar);
131 static int chameleon_get_bar(void __iomem **base, phys_addr_t mapbase,
132 struct chameleon_bar **cb)
134 struct chameleon_bar *c;
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
146 dtype = get_next_dtype(*base);
147 if (dtype == CHAMELEON_DTYPE_BAR) {
150 bar_count = BAR_CNT(reg);
151 if (bar_count <= 0 || bar_count > CHAMELEON_BAR_MAX)
154 c = kcalloc(bar_count, sizeof(struct chameleon_bar),
159 chameleon_parse_bar(*base, c, bar_count);
160 *base += BAR_DESC_SIZE(bar_count);
162 c = kzalloc(sizeof(struct chameleon_bar), GFP_KERNEL);
175 int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
178 struct chameleon_fpga_header *header;
179 struct chameleon_bar *cb;
180 void __iomem *p = base;
188 hsize = sizeof(struct chameleon_fpga_header);
190 header = kzalloc(hsize, GFP_KERNEL);
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",
206 bus->revision = header->revision;
207 bus->model = header->model;
208 bus->minor = header->minor;
209 snprintf(bus->name, CHAMELEON_FILENAME_LEN + 1, "%s",
212 bar_count = chameleon_get_bar(&p, mapbase, &cb);
218 for_each_chameleon_cell(dtype, p) {
220 case CHAMELEON_DTYPE_GENERAL:
221 ret = chameleon_parse_gdd(bus, cb, p, bar_count);
224 p += sizeof(struct chameleon_gdd);
226 case CHAMELEON_DTYPE_BRIDGE:
227 chameleon_parse_bdd(bus, cb, p);
228 p += sizeof(struct chameleon_bdd);
230 case CHAMELEON_DTYPE_END:
233 pr_err("Invalid chameleon descriptor type 0x%x\n",
241 if (num_cells == 0) {
246 table_size = p - base;
247 pr_debug("%d cell(s) found. Chameleon table size: 0x%04x bytes\n", num_cells, table_size);
259 EXPORT_SYMBOL_NS_GPL(chameleon_parse_cells, MCB);