Hi Ariel,
Am 19.10.2015 um 19:32 schrieb Ariel D'Alessandro:
> This commit adds support for NXP LPC18xx EEPROM memory found in NXP
> LPC185x/3x and LPC435x/3x/2x/1x devices.
>
> EEPROM size is 16384 bytes and it can be entirely read and
> written/erased with 1 word (4 bytes) granularity. The last page
> (128 bytes) contains the EEPROM initialization data and is not writable.
>
> Erase/program time is less than 3ms. The EEPROM device requires a
> ~1500 kHz clock (min 800 kHz, max 1600 kHz) that is generated dividing
> the system bus clock by the division factor, contained in the divider
> register (minus 1 encoded).
>
> Signed-off-by: Ariel D'Alessandro <ariel@xxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/nvmem/Kconfig | 9 ++
> drivers/nvmem/Makefile | 2 +
> drivers/nvmem/lpc18xx_eeprom.c | 266 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 277 insertions(+)
> create mode 100644 drivers/nvmem/lpc18xx_eeprom.c
> [...]
> +
> +static int lpc18xx_eeprom_gather_write(void *context, const void *reg,
> + size_t reg_size, const void *val,
> + size_t val_size)
> +{
> + struct lpc18xx_eeprom_dev *eeprom = context;
> + unsigned int offset = *(u32 *)reg;
> +
> + /* 3 ms of erase/program time between each writing */
> + while (val_size) {
> + writel(*(u32 *)val, eeprom->mem_base + offset);
> + usleep_range(3000, 4000);
i think it would be good to verify that the EEPROM write operation has
really finished.
Best regards
Stefan
> + val_size -= eeprom->val_bytes;
> + val += eeprom->val_bytes;
> + offset += eeprom->val_bytes;
> + }
> +
> + return 0;
> +}
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