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 mdev->is_added = false;
104 ret = mcb_device_register(bus, mdev);
116 static void chameleon_parse_bar(void __iomem *base,
117 struct chameleon_bar *cb, int bar_count)
119 char __iomem *p = base;
125 for (i = 0; i < bar_count; i++) {
126 cb[i].addr = readl(p);
127 cb[i].size = readl(p + 4);
129 p += sizeof(struct chameleon_bar);
133 static int chameleon_get_bar(char __iomem **base, phys_addr_t mapbase,
134 struct chameleon_bar **cb)
136 struct chameleon_bar *c;
142 * For those devices which are not connected
143 * to the PCI Bus (e.g. LPC) there is a bar
144 * descriptor located directly after the
145 * chameleon header. This header is comparable
148 dtype = get_next_dtype(*base);
149 if (dtype == CHAMELEON_DTYPE_BAR) {
152 bar_count = BAR_CNT(reg);
153 if (bar_count <= 0 || bar_count > CHAMELEON_BAR_MAX)
156 c = kcalloc(bar_count, sizeof(struct chameleon_bar),
161 chameleon_parse_bar(*base, c, bar_count);
162 *base += BAR_DESC_SIZE(bar_count);
164 c = kzalloc(sizeof(struct chameleon_bar), GFP_KERNEL);
177 int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
180 struct chameleon_fpga_header *header;
181 struct chameleon_bar *cb;
182 char __iomem *p = base;
189 hsize = sizeof(struct chameleon_fpga_header);
191 header = kzalloc(hsize, GFP_KERNEL);
195 /* Extract header information */
196 memcpy_fromio(header, p, hsize);
197 /* We only support chameleon v2 at the moment */
198 header->magic = le16_to_cpu(header->magic);
199 if (header->magic != CHAMELEONV2_MAGIC) {
200 pr_err("Unsupported chameleon version 0x%x\n",
207 bus->revision = header->revision;
208 bus->model = header->model;
209 bus->minor = header->minor;
210 snprintf(bus->name, CHAMELEON_FILENAME_LEN + 1, "%s",
213 bar_count = chameleon_get_bar(&p, mapbase, &cb);
219 for_each_chameleon_cell(dtype, p) {
221 case CHAMELEON_DTYPE_GENERAL:
222 ret = chameleon_parse_gdd(bus, cb, p, bar_count);
225 p += sizeof(struct chameleon_gdd);
227 case CHAMELEON_DTYPE_BRIDGE:
228 chameleon_parse_bdd(bus, cb, p);
229 p += sizeof(struct chameleon_bdd);
231 case CHAMELEON_DTYPE_END:
234 pr_err("Invalid chameleon descriptor type 0x%x\n",
256 EXPORT_SYMBOL_NS_GPL(chameleon_parse_cells, MCB);