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fel: Add fel_readl_n() and fel_writel_n() wrappers

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These functions solve the problem that large readl/writel
transfers might be limited by insufficient (scratch) buffer
size. To solve this, chunks of no more than LCODE_MAX_WORDS
get transferred individually.

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
This commit is contained in:
Bernhard Nortmann 2016-11-08 19:54:40 +01:00
parent c4389988aa
commit 8e53d2bf9a
1 changed files with 32 additions and 0 deletions
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32
fel.c
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@ -550,6 +550,22 @@ uint32_t aw_fel_readl(libusb_device_handle *usb, uint32_t addr)
return val;
}
/*
* aw_fel_readl_n() wrapper that can handle large transfers. If necessary,
* those will be done in separate 'chunks' of no more than LCODE_MAX_WORDS.
*/
void fel_readl_n(libusb_device_handle *usb, uint32_t addr,
uint32_t *dst, size_t count)
{
while (count > 0) {
size_t n = count > LCODE_MAX_WORDS ? LCODE_MAX_WORDS : count;
aw_fel_readl_n(usb, addr, dst, n);
addr += n * sizeof(uint32_t);
dst += n;
count -= n;
}
}
/* multiple "writel" from a source buffer to sequential addresses */
void aw_fel_writel_n(libusb_device_handle *usb, uint32_t addr,
uint32_t *src, size_t count)
@ -601,6 +617,22 @@ void aw_fel_writel(libusb_device_handle *usb, uint32_t addr, uint32_t val)
aw_fel_writel_n(usb, addr, &val, 1);
}
/*
* aw_fel_writel_n() wrapper that can handle large transfers. If necessary,
* those will be done in separate 'chunks' of no more than LCODE_MAX_WORDS.
*/
void fel_writel_n(libusb_device_handle *usb, uint32_t addr,
uint32_t *src, size_t count)
{
while (count > 0) {
size_t n = count > LCODE_MAX_WORDS ? LCODE_MAX_WORDS : count;
aw_fel_writel_n(usb, addr, src, n);
addr += n * sizeof(uint32_t);
src += n;
count -= n;
}
}
void aw_fel_print_sid(libusb_device_handle *usb)
{
soc_info_t *soc_info = aw_fel_get_soc_info(usb);