From: stefan.wahren@i2se•com (Stefan Wahren)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2 2/4] nvmem: NXP LPC18xx EEPROM memory NVMEM driver
Date: Tue, 3 Nov 2015 09:20:00 +0100 [thread overview]
Message-ID: <56386E30.4060905@i2se.com> (raw)
In-Reply-To: <1445275946-32653-3-git-send-email-ariel@vanguardiasur.com.ar>
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@vanguardiasur•com.ar>
> ---
> 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;
> +}
next prev parent reply other threads:[~2015-11-03 8:20 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-19 17:32 [PATCH v2 0/4] Add support for NXP LPC18xx EEPROM using nvmem Ariel D'Alessandro
2015-10-19 17:32 ` [PATCH v2 1/4] DT: nvmem: Add NXP LPC18xx EEPROM memory binding documentation Ariel D'Alessandro
2015-10-24 21:44 ` Joachim Eastwood
2015-10-30 12:45 ` Ariel D'Alessandro
2015-10-27 7:49 ` Rob Herring
2015-10-19 17:32 ` [PATCH v2 2/4] nvmem: NXP LPC18xx EEPROM memory NVMEM driver Ariel D'Alessandro
2015-10-24 22:04 ` Joachim Eastwood
2015-10-26 13:37 ` Srinivas Kandagatla
2015-10-30 14:58 ` Ariel D'Alessandro
2015-11-16 15:33 ` Ariel D'Alessandro
2015-11-16 15:37 ` Srinivas Kandagatla
2015-12-03 18:39 ` Ezequiel Garcia
2015-10-30 14:55 ` Ariel D'Alessandro
2015-11-16 15:24 ` Ariel D'Alessandro
2015-10-26 14:23 ` Srinivas Kandagatla
2015-10-30 15:42 ` Ariel D'Alessandro
2015-10-30 16:00 ` Ezequiel Garcia
2015-11-03 8:20 ` Stefan Wahren [this message]
2015-11-16 15:29 ` Ariel D'Alessandro
2015-11-17 10:01 ` Stefan Wahren
2015-11-17 19:53 ` Ariel D'Alessandro
2015-10-19 17:32 ` [PATCH v2 3/4] ARM: dts: lpc18xx: add EEPROM memory node Ariel D'Alessandro
2015-10-24 21:42 ` Joachim Eastwood
2015-10-19 17:32 ` [PATCH v2 4/4] ARM: configs: lpc18xx: enable EEPROM NVMEM driver Ariel D'Alessandro
2015-10-24 21:41 ` Joachim Eastwood
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