mcb-parse.c revision 3764e82e5150d87b205c10cd78a9c9ab86fbfa51 
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			return -EINVAL;
145		}
146		num_cells++;
147	}
148
149	if (num_cells == 0)
150		num_cells = -EINVAL;
151
152	kfree(header);
153	return num_cells;
154
155out:
156	kfree(header);
157	return ret;
158}
159EXPORT_SYMBOL_GPL(chameleon_parse_cells);
160