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);