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Message-ID: <4A38BDB8.5030804@atmel.com>
Date: Wed, 17 Jun 2009 11:56:08 +0200
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: Rob Emanuele <rob@...nuele.us>, haavard.skinnemoen@...el.com
CC: linux-arm-kernel@...ts.arm.linux.org.uk,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] atmel-mci: Unified Atmel MCI drivers (AVR32 & AT91)
Rob, Haavard,
Rob Emanuele :
> Unification of the atmel-mci driver to support the AT91 processors MCI interface. The atmel-mci driver currently supports the AVR32 and this patch adds AT91 support.
>
> To use this new driver on a at91 the platform driver for your board needs to updated. See the following patch for an example of how to do that.
I format those lines remove last sentence and add :
"Add read/write proof selection switch dependent on chip availability
of this feature."
> Signed-off-by: Rob Emanuele <rob@...nuele.us>
> ---
> drivers/mmc/host/Kconfig | 16 ++++++++++++----
> drivers/mmc/host/atmel-mci.c | 37 +++++++++++++++++++++++++++++++++----
> 2 files changed, 45 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 40111a6..a0eaf69 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -135,6 +135,12 @@ config MMC_AU1X
>
> If unsure, say N.
>
> +choice
> + prompt "Atmel MMC Driver"
I add SD/MMC
> + default MMC_ATMELMCI if AVR32
> + help
> + Choose which driver to use for the Atmel MCI Silicon
> +
> config MMC_AT91
> tristate "AT91 SD/MMC Card Interface support"
> depends on ARCH_AT91
> @@ -145,17 +151,19 @@ config MMC_AT91
>
> config MMC_ATMELMCI
> tristate "Atmel Multimedia Card Interface support"
> - depends on AVR32
> + depends on AVR32 || ARCH_AT91
> help
> This selects the Atmel Multimedia Card Interface driver. If
> - you have an AT32 (AVR32) platform with a Multimedia Card
> - slot, say Y or M here.
> + you have an AT32 (AVR32) or AT91 platform with a Multimedia
> + Card slot, say Y or M here.
>
> If unsure, say N.
>
> +endchoice
> +
> config MMC_ATMELMCI_DMA
> bool "Atmel MCI DMA support (EXPERIMENTAL)"
> - depends on MMC_ATMELMCI && DMA_ENGINE && EXPERIMENTAL
> + depends on MMC_ATMELMCI && AVR32 && DMA_ENGINE && EXPERIMENTAL
> help
> Say Y here to have the Atmel MCI driver use a DMA engine to
> do data transfers and thus increase the throughput and
> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
> index 7b603e4..98b25de 100644
> --- a/drivers/mmc/host/atmel-mci.c
> +++ b/drivers/mmc/host/atmel-mci.c
> @@ -30,11 +30,14 @@
> #include <asm/io.h>
> #include <asm/unaligned.h>
>
> +#include <mach/cpu.h>
> #include <mach/board.h>
>
> #include "atmel-mci-regs.h"
>
> -#define ATMCI_DATA_ERROR_FLAGS (MCI_DCRCE | MCI_DTOE | MCI_OVRE | MCI_UNRE)
> +#define ATMCI_DATA_ERROR_FLAGS (MCI_RINDE | MCI_RDIRE | MCI_RCRCE \
> + | MCI_RENDE | MCI_RTOE | MCI_DCRCE \
> + | MCI_DTOE | MCI_OVRE | MCI_UNRE)
Haavard, is it ok to add those flags on an AVR32 platform for now ?
> #define ATMCI_DMA_THRESHOLD 16
>
> enum {
> @@ -210,6 +213,18 @@ struct atmel_mci_slot {
> set_bit(event, &host->pending_events)
>
> /*
> + * Enable or disable features/registers based on
> + * whether the processor supports them
> + */
> +static bool mci_has_rwproof(void)
> +{
> + if (cpu_is_at91sam9261() || cpu_is_at91rm9200())
> + return false;
> + else
> + return true;
> +}
> +
> +/*
> * The debugfs stuff below is mostly optimized away when
> * CONFIG_DEBUG_FS is not set.
> */
> @@ -276,8 +291,13 @@ static void atmci_show_status_reg(struct seq_file *s,
> [3] = "BLKE",
> [4] = "DTIP",
> [5] = "NOTBUSY",
> + [6] = "ENDRX",
> + [7] = "ENDTX",
> [8] = "SDIOIRQA",
> [9] = "SDIOIRQB",
> + [12] = "SDIOWAIT",
> + [14] = "RXBUFF",
> + [15] = "TXBUFE",
> [16] = "RINDE",
> [17] = "RDIRE",
> [18] = "RCRCE",
> @@ -285,6 +305,11 @@ static void atmci_show_status_reg(struct seq_file *s,
> [20] = "RTOE",
> [21] = "DCRCE",
> [22] = "DTOE",
> + [23] = "CSTOE",
> + [24] = "BLKOVRE",
> + [25] = "DMADONE",
> + [26] = "FIFOEMPTY",
> + [27] = "XFRDONE",
Little indentation modifications.
> [30] = "OVRE",
> [31] = "UNRE",
> };
> @@ -849,13 +874,15 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> clkdiv = 255;
> }
>
> + host->mode_reg = MCI_MR_CLKDIV(clkdiv);
> +
> /*
> * WRPROOF and RDPROOF prevent overruns/underruns by
> * stopping the clock when the FIFO is full/empty.
> * This state is not expected to last for long.
> */
> - host->mode_reg = MCI_MR_CLKDIV(clkdiv) | MCI_MR_WRPROOF
> - | MCI_MR_RDPROOF;
> + if (mci_has_rwproof())
> + host->mode_reg |= (MCI_MR_WRPROOF | MCI_MR_RDPROOF);
>
> if (list_empty(&host->queue))
> mci_writel(host, MR, host->mode_reg);
> @@ -1648,8 +1675,10 @@ static int __init atmci_probe(struct platform_device *pdev)
> nr_slots++;
> }
>
> - if (!nr_slots)
> + if (!nr_slots) {
> + printk(KERN_ERR "Atmel MCI controller init failed. atmci_init_slot error or no slots with bus_width > 0.\n");
I change this to :
dev_err(&pdev->dev, "init failed: no slot defined\n");
> goto err_init_slot;
> + }
>
> dev_info(&pdev->dev,
> "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
If Haavard is ok, I post the patch to Pierre Ossman with the tiny
modifications above (your SOB & From: preserved of course).
Thanks, Bye,
--
Nicolas Ferre
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