forked from KolibriOS/kolibrios
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/byteorder/little_endian.h>
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#include <linux/gfp.h>
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#include <linux/errno.h>
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#include <linux/firmware.h>
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extern struct builtin_fw __start_builtin_fw[];
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extern struct builtin_fw __end_builtin_fw[];
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/* Intel HEX files actually limit the length to 256 bytes, but we have
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drivers which would benefit from using separate records which are
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longer than that, so we extend to 16 bits of length */
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struct ihex_binrec {
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__be32 addr;
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__be16 len;
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uint8_t data[0];
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} __attribute__((packed));
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/* Find the next record, taking into account the 4-byte alignment */
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static inline const struct ihex_binrec *
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ihex_next_binrec(const struct ihex_binrec *rec)
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{
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int next = ((be16_to_cpu(rec->len) + 5) & ~3) - 2;
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rec = (void *)&rec->data[next];
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return be16_to_cpu(rec->len) ? rec : NULL;
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}
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int
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request_firmware(const struct firmware **firmware_p, const char *name,
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struct device *device)
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{
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struct firmware *firmware;
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struct builtin_fw *builtin;
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const struct ihex_binrec *rec;
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unsigned int size;
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int retval;
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if (!firmware_p)
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return -EINVAL;
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*firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL);
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if (!firmware) {
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dbgprintf("%s: kmalloc(struct firmware) failed\n", __func__);
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return -ENOMEM;
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}
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for (builtin = __start_builtin_fw; builtin != __end_builtin_fw;
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builtin++)
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{
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uint8_t *pfw;
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if (strcmp(name, builtin->name))
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continue;
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dbgprintf("firmware: using built-in firmware %s\n", name);
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#if 0
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size = 0;
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for (rec = (const struct ihex_binrec *)builtin->data;
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rec; rec = ihex_next_binrec(rec))
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{
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size += be16_to_cpu(rec->len);
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}
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dbgprintf("firmware size %d\n", size);
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if(unlikely( size == 0))
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return -EINVAL;
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pfw = (uint8_t*)kzalloc(size, 0);
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if(unlikely(pfw == 0))
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return -ENOMEM;
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firmware->size = size;
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firmware->data = pfw;
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for (rec = (const struct ihex_binrec *)builtin->data;
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rec; rec = ihex_next_binrec(rec))
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{
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unsigned int src_size;
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src_size = be16_to_cpu(rec->len);
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memcpy(pfw, rec->data, src_size);
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pfw+= src_size;
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};
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#else
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dbgprintf("firmware size %d\n", builtin->size);
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firmware->size = builtin->size;
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firmware->data = builtin->data;
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#endif
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return 0;
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}
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kfree(firmware);
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*firmware_p = NULL;
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return -EINVAL;
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};
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void
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release_firmware(const struct firmware *fw)
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{
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if (fw) {
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kfree((void*)fw);
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}
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}
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/*
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struct platform_device*
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platform_device_register_simple(const char* c, int id, void *r, unsigned int i)
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{
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static struct platform_device pd;
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return &pd;
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};
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*/
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