From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2 04/11] serial: Use a more precise baud rate generation for serial_s3c24x0
Date: Fri, 14 Sep 2012 20:05:12 +0200 [thread overview]
Message-ID: <201209142005.12736.marex@denx.de> (raw)
In-Reply-To: <1347643742-19966-5-git-send-email-jose.goncalves@inov.pt>
Dear Jos? Miguel Gon?alves,
> Program udivslot register in order to obtain a more precise baudrate.
More explanatory commit message would be nice.
[...]
> +static const int udivslot[] = {
const array const members, no ?
> + 0x0000, 0x0080, 0x0808, 0x0888, 0x2222, 0x4924, 0x4A52, 0x54AA,
> + 0x5555, 0xD555, 0xD5D5, 0xDDD5, 0xDDDD, 0xDFDD, 0xDFDF, 0xFFDF,
> +};
> +
> void _serial_setbrg(const int dev_index)
> {
> struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
> - unsigned int reg = 0;
> + u32 pclk;
> + u32 baudrate;
> int i;
>
> - /* value is calculated so : (int)(PCLK/16./baudrate) -1 */
> - reg = get_PCLK() / (16 * gd->baudrate) - 1;
> + pclk = get_PCLK();
> + baudrate = gd->baudrate;
>
> - writel(reg, &uart->ubrdiv);
> + writel((pclk / baudrate / 16) - 1, &uart->ubrdiv);
> + writel(udivslot[(pclk / baudrate) % 16], &uart->udivslot);
> for (i = 0; i < 100; i++)
> /* Delay */ ;
> }
Best regards,
Marek Vasut
next prev parent reply other threads:[~2012-09-14 18:05 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-14 17:28 [U-Boot] [PATCH v2 00/11] S3C24XX: Add support to MINI2416 board José Miguel Gonçalves
2012-09-14 17:28 ` [U-Boot] [PATCH v2 01/11] ARM: fix relocation on ARM926EJS José Miguel Gonçalves
2012-09-15 18:03 ` Marek Vasut
2012-09-16 9:45 ` José Miguel Gonçalves
2012-09-16 10:06 ` Marek Vasut
2012-09-16 10:16 ` José Miguel Gonçalves
2012-09-16 15:36 ` Marek Vasut
2012-09-16 16:26 ` José Miguel Gonçalves
2012-09-16 17:17 ` Marek Vasut
2012-09-17 6:28 ` Christian Riesch
2012-09-17 8:34 ` José Miguel Gonçalves
2012-09-17 9:03 ` Christian Riesch
2012-09-17 9:20 ` José Miguel Gonçalves
2012-09-17 17:18 ` Tom Rini
2012-09-17 17:23 ` Scott Wood
2012-09-17 17:32 ` Tom Rini
2012-09-17 17:26 ` Marek Vasut
2012-09-17 17:35 ` Tom Rini
2012-09-17 17:48 ` Marek Vasut
2012-09-17 18:00 ` Tom Rini
2012-09-17 17:27 ` José Miguel Gonçalves
2012-10-04 14:24 ` Albert ARIBAUD
2012-09-14 17:28 ` [U-Boot] [PATCH v2 02/11] S3C24XX: Add core support for Samsung's S3C24XX SoCs José Miguel Gonçalves
2012-09-14 18:03 ` Marek Vasut
[not found] ` <505375E3.6050005@inov.pt>
2012-09-14 18:25 ` Marek Vasut
2012-09-14 19:01 ` Scott Wood
2012-09-14 19:07 ` Marek Vasut
2012-09-14 19:17 ` Scott Wood
2012-09-14 18:39 ` Tom Rini
2012-09-14 17:28 ` [U-Boot] [PATCH v2 03/11] serial: Add support to 4 ports in serial_s3c24x0 José Miguel Gonçalves
2012-09-14 17:28 ` [U-Boot] [PATCH v2 04/11] serial: Use a more precise baud rate generation for serial_s3c24x0 José Miguel Gonçalves
2012-09-14 18:05 ` Marek Vasut [this message]
2012-09-14 17:28 ` [U-Boot] [PATCH v2 05/11] serial: Remove unnecessary delay in serial_s3c24x0 José Miguel Gonçalves
2012-09-14 18:05 ` Marek Vasut
2012-09-14 17:28 ` [U-Boot] [PATCH v2 06/11] rtc: Improve rtc_get() on s3c24x0_rtc José Miguel Gonçalves
2012-09-14 18:06 ` Marek Vasut
2012-09-14 17:28 ` [U-Boot] [PATCH v2 07/11] rtc: Fix rtc_reset() " José Miguel Gonçalves
2012-09-14 18:07 ` Marek Vasut
2012-09-14 17:28 ` [U-Boot] [PATCH v2 08/11] rtc: Don't allow setting unsuported years " José Miguel Gonçalves
2012-09-14 18:08 ` Marek Vasut
2012-09-14 17:29 ` [U-Boot] [PATCH v2 09/11] S3C24XX: Add NAND Flash driver José Miguel Gonçalves
2012-09-14 18:21 ` Marek Vasut
2012-09-14 18:45 ` José Miguel Gonçalves
2012-09-14 19:01 ` Tom Rini
2012-09-16 9:16 ` José Miguel Gonçalves
2012-09-17 16:57 ` Tom Rini
2012-09-17 17:03 ` Scott Wood
2012-09-17 17:08 ` Tom Rini
2012-09-17 17:13 ` Scott Wood
2012-09-17 17:08 ` José Miguel Gonçalves
2012-09-17 17:56 ` Tom Rini
2012-09-17 18:05 ` José Miguel Gonçalves
2012-09-17 18:27 ` Tom Rini
2012-09-17 18:34 ` José Miguel Gonçalves
2012-09-17 18:56 ` Tom Rini
2012-09-14 19:24 ` Scott Wood
2012-09-14 20:20 ` Tom Rini
2012-09-14 20:29 ` Scott Wood
2012-09-17 11:11 ` José Miguel Gonçalves
2012-09-14 18:47 ` Tom Rini
2012-09-14 17:29 ` [U-Boot] [PATCH v2 10/11] Add u-boot-ubl.bin target to the Makefile José Miguel Gonçalves
2012-09-14 18:22 ` Marek Vasut
2012-09-14 19:08 ` Tom Rini
2012-09-16 9:27 ` José Miguel Gonçalves
2012-09-17 6:47 ` Christian Riesch
2012-09-17 8:30 ` José Miguel Gonçalves
2012-09-17 9:10 ` Christian Riesch
2012-09-17 9:24 ` José Miguel Gonçalves
2012-09-17 14:45 ` Tom Rini
2012-09-17 16:29 ` Marek Vasut
2012-09-17 16:35 ` Tom Rini
2012-09-17 16:27 ` Scott Wood
2012-09-17 16:51 ` Tom Rini
2012-09-17 17:32 ` Scott Wood
2012-09-17 17:53 ` Tom Rini
2012-09-17 18:16 ` Scott Wood
2012-09-17 19:52 ` Wolfgang Denk
2012-09-14 17:29 ` [U-Boot] [PATCH v2 11/11] S3C24XX: Add support to MINI2416 board José Miguel Gonçalves
2012-09-14 18:58 ` Tom Rini
2012-09-16 9:11 ` José Miguel Gonçalves
2012-09-17 14:39 ` Tom Rini
2012-09-17 14:47 ` José Miguel Gonçalves
2012-09-17 15:11 ` Tom Rini
2012-09-18 12:11 ` José Miguel Gonçalves
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