linux-kernel - RE: [RFC 07/47] mtd: nand: stm_nand_bch: initialise the BCH Controller

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Date:	Wed, 26 Mar 2014 10:25:52 +0000
From:	"Gupta, Pekon" <pekon@...com>
To:	Lee Jones <lee.jones@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"kernel@...inux.com" <kernel@...inux.com>,
	"computersforpeace@...il.com" <computersforpeace@...il.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"angus.clark@...com" <angus.clark@...com>,
	"Ezequiel Garcia (ezequiel.garcia@...e-electrons.com)" 
	<ezequiel.garcia@...e-electrons.com>
Subject: RE: [RFC 07/47] mtd: nand: stm_nand_bch: initialise the BCH
 Controller

Hi Lee,

>From: Lee Jones [mailto:lee.jones@...aro.org]
missing commit log :-)
Though $subject is self-explanatory, but you can add more description about
assumption and hardware caveats about the controller, and its use.

>
>Signed-off-by: Lee Jones <lee.jones@...aro.org>
>---
> drivers/mtd/nand/stm_nand_bch.c | 56 +++++++++++++++++++++++++++++++++++++++++
> include/linux/mtd/stm_nand.h    | 20 +++++++++++++++
> 2 files changed, 76 insertions(+)
>
>diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
>index 76a0d02..1a93f8d 100644
>--- a/drivers/mtd/nand/stm_nand_bch.c
>+++ b/drivers/mtd/nand/stm_nand_bch.c
>@@ -14,6 +14,7 @@
>
> #include <linux/kernel.h>
> #include <linux/module.h>
>+#include <linux/delay.h>
> #include <linux/io.h>
> #include <linux/interrupt.h>
> #include <linux/device.h>
>@@ -102,6 +103,56 @@ static void nandi_disable_interrupts(struct nandi_controller *nandi,
> 	writel(val, nandi->base + NANDBCH_INT_EN);
> }
>
>+static void nandi_init_bch(struct nandi_controller *nandi, int emi_bank)
>+{
>+	dev_dbg(nandi->dev, "%s\n", __func__);
>+
>+	/* Initialise BCH Controller */
>+	emiss_nandi_select(STM_NANDI_BCH);
>+
>+	/* Reset and disable boot-mode controller */
>+	writel(BOOT_CFG_RESET, nandi->base + NANDBCH_BOOTBANK_CFG);
>+	udelay(1);
>+	writel(0x00000000, nandi->base + NANDBCH_BOOTBANK_CFG);

Why using 'udelay' ?
Isn't there any status register which tells you that controller is reset / initialized ?
Or may be polling on NANDBCH_BOOTBANK_CFG may itself give you status.

>+
>+	/* Reset AFM controller */
>+	writel(CFG_RESET, nandi->base + NANDBCH_CONTROLLER_CFG);
>+	udelay(1);
>+	writel(0x00000000, nandi->base + NANDBCH_CONTROLLER_CFG);
>+
>+	/* Set EMI Bank */
>+	writel(0x1 << emi_bank, nandi->base + NANDBCH_FLEX_MUXCTRL);
>+
>+	/* Reset ECC stats */
>+	writel(0x7f0, nandi->base + NANDBCH_CONTROLLER_CFG);
>+	udelay(1);
>+
"0x7f0" ?? please use Macro instead.


with regards, pekon
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