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Date: Wed, 11 Jul 2018 17:19:11 +0200
From: Ludovic BARRE <ludovic.barre@...com>
To: Ulf Hansson <ulf.hansson@...aro.org>
CC: Rob Herring <robh+dt@...nel.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...com>,
Gerald Baeza <gerald.baeza@...com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH 02/19] mmc: mmci: merge qcom dml feature into mmci dma
On 07/05/2018 05:26 PM, Ulf Hansson wrote:
> On 12 June 2018 at 15:14, Ludovic Barre <ludovic.Barre@...com> wrote:
>> From: Ludovic Barre <ludovic.barre@...com>
>>
>> This patch integrates qcom dml feature into mmci_dma file.
>> Qualcomm Data Mover lite/local is already a variant of mmci dmaengine.
>>
>> Signed-off-by: Ludovic Barre <ludovic.barre@...com>
>> ---
>> drivers/mmc/host/Makefile | 1 -
>> drivers/mmc/host/mmci.c | 1 -
>> drivers/mmc/host/mmci.h | 35 ++++++++
>> drivers/mmc/host/mmci_dma.c | 135 ++++++++++++++++++++++++++++-
>> drivers/mmc/host/mmci_qcom_dml.c | 177 ---------------------------------------
>> drivers/mmc/host/mmci_qcom_dml.h | 31 -------
>> 6 files changed, 169 insertions(+), 211 deletions(-)
>> delete mode 100644 drivers/mmc/host/mmci_qcom_dml.c
>> delete mode 100644 drivers/mmc/host/mmci_qcom_dml.h
>
> No, this is not the way to go. Instead I I think there are two options.
>
> 1) Keep mmci_qcom_dml.c|h and thus add new files for the stm32 dma variant.
>
> 2) Start by renaming mmci_qcom_dml.* to mmc_dma.* and then in the next
> step add the code for stm32 dma into the renamed files.
>
> I guess if there is some overlap in functionality, 2) may be best as
> it could easier avoid open coding. However, I am fine with whatever
> option and I expect that you knows what is best.
After patch 01 & 05 comments:
I will try to define a mmci_ops which contain some functions pointer
called by mmci.c (core).
A variant defines its mmci_ops.
where do you define the specific function:
-in a single file, mmci-ops.c or other (for the name, I'm not inspirated)
-or in specific file for each variant mmci-qcom.c or mmci-stm32.c
following the comment (above), I think we define a single file?
>
> Kind regards
> Uffe
>
>>
>> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
>> index daecaa98..608a020 100644
>> --- a/drivers/mmc/host/Makefile
>> +++ b/drivers/mmc/host/Makefile
>> @@ -5,7 +5,6 @@
>>
>> obj-$(CONFIG_MMC_ARMMMCI) += armmmci.o
>> armmmci-y := mmci.o mmci_dma.o
>> -armmmci-$(CONFIG_MMC_QCOM_DML) += mmci_qcom_dml.o
>> obj-$(CONFIG_MMC_PXA) += pxamci.o
>> obj-$(CONFIG_MMC_MXC) += mxcmmc.o
>> obj-$(CONFIG_MMC_MXS) += mxs-mmc.o
>> diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
>> index 8868be0..7a15afd 100644
>> --- a/drivers/mmc/host/mmci.c
>> +++ b/drivers/mmc/host/mmci.c
>> @@ -43,7 +43,6 @@
>>
>> #include "mmci.h"
>> #include "mmci_dma.h"
>> -#include "mmci_qcom_dml.h"
>>
>> #define DRIVER_NAME "mmci-pl18x"
>>
>> diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
>> index a73bb98..f7cba35 100644
>> --- a/drivers/mmc/host/mmci.h
>> +++ b/drivers/mmc/host/mmci.h
>> @@ -194,6 +194,41 @@
>>
>> #define MMCI_PINCTRL_STATE_OPENDRAIN "opendrain"
>>
>> +/* QCOM DML Registers */
>> +#define DML_CONFIG 0x00
>> +#define PRODUCER_CRCI_MSK GENMASK(1, 0)
>> +#define PRODUCER_CRCI_DISABLE 0
>> +#define PRODUCER_CRCI_X_SEL BIT(0)
>> +#define PRODUCER_CRCI_Y_SEL BIT(1)
>> +#define CONSUMER_CRCI_MSK GENMASK(3, 2)
>> +#define CONSUMER_CRCI_DISABLE 0
>> +#define CONSUMER_CRCI_X_SEL BIT(2)
>> +#define CONSUMER_CRCI_Y_SEL BIT(3)
>> +#define PRODUCER_TRANS_END_EN BIT(4)
>> +#define BYPASS BIT(16)
>> +#define DIRECT_MODE BIT(17)
>> +#define INFINITE_CONS_TRANS BIT(18)
>> +
>> +#define DML_SW_RESET 0x08
>> +#define DML_PRODUCER_START 0x0c
>> +#define DML_CONSUMER_START 0x10
>> +#define DML_PRODUCER_PIPE_LOGICAL_SIZE 0x14
>> +#define DML_CONSUMER_PIPE_LOGICAL_SIZE 0x18
>> +#define DML_PIPE_ID 0x1c
>> +#define PRODUCER_PIPE_ID_SHFT 0
>> +#define PRODUCER_PIPE_ID_MSK GENMASK(4, 0)
>> +#define CONSUMER_PIPE_ID_SHFT 16
>> +#define CONSUMER_PIPE_ID_MSK GENMASK(20, 16)
>> +
>> +#define DML_PRODUCER_BAM_BLOCK_SIZE 0x24
>> +#define DML_PRODUCER_BAM_TRANS_SIZE 0x28
>> +
>> +/* other definitions */
>> +#define PRODUCER_PIPE_LOGICAL_SIZE 4096
>> +#define CONSUMER_PIPE_LOGICAL_SIZE 4096
>> +
>> +#define DML_OFFSET 0x800
>> +
>> struct clk;
>> struct dma_chan;
>>
>> diff --git a/drivers/mmc/host/mmci_dma.c b/drivers/mmc/host/mmci_dma.c
>> index 98a542d..dd7dae5 100644
>> --- a/drivers/mmc/host/mmci_dma.c
>> +++ b/drivers/mmc/host/mmci_dma.c
>> @@ -8,11 +8,11 @@
>> #include <linux/dmaengine.h>
>> #include <linux/mmc/host.h>
>> #include <linux/mmc/card.h>
>> +#include <linux/of.h>
>> #include <linux/scatterlist.h>
>>
>> #include "mmci.h"
>> #include "mmci_dma.h"
>> -#include "mmci_qcom_dml.h"
>>
>> int mmci_dma_setup(struct mmci_host *host)
>> {
>> @@ -101,6 +101,139 @@ struct dmaengine_priv {
>>
>> #define dma_inprogress(dmae) ((dmae)->dma_in_progress)
>>
>> +#ifdef CONFIG_MMC_QCOM_DML
>> +void dml_start_xfer(struct mmci_host *host, struct mmc_data *data)
>> +{
>> + u32 config;
>> + void __iomem *base = host->base + DML_OFFSET;
>> +
>> + if (data->flags & MMC_DATA_READ) {
>> + /* Read operation: configure DML for producer operation */
>> + /* Set producer CRCI-x and disable consumer CRCI */
>> + config = readl_relaxed(base + DML_CONFIG);
>> + config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_X_SEL;
>> + config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_DISABLE;
>> + writel_relaxed(config, base + DML_CONFIG);
>> +
>> + /* Set the Producer BAM block size */
>> + writel_relaxed(data->blksz, base + DML_PRODUCER_BAM_BLOCK_SIZE);
>> +
>> + /* Set Producer BAM Transaction size */
>> + writel_relaxed(data->blocks * data->blksz,
>> + base + DML_PRODUCER_BAM_TRANS_SIZE);
>> + /* Set Producer Transaction End bit */
>> + config = readl_relaxed(base + DML_CONFIG);
>> + config |= PRODUCER_TRANS_END_EN;
>> + writel_relaxed(config, base + DML_CONFIG);
>> + /* Trigger producer */
>> + writel_relaxed(1, base + DML_PRODUCER_START);
>> + } else {
>> + /* Write operation: configure DML for consumer operation */
>> + /* Set consumer CRCI-x and disable producer CRCI*/
>> + config = readl_relaxed(base + DML_CONFIG);
>> + config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_X_SEL;
>> + config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_DISABLE;
>> + writel_relaxed(config, base + DML_CONFIG);
>> + /* Clear Producer Transaction End bit */
>> + config = readl_relaxed(base + DML_CONFIG);
>> + config &= ~PRODUCER_TRANS_END_EN;
>> + writel_relaxed(config, base + DML_CONFIG);
>> + /* Trigger consumer */
>> + writel_relaxed(1, base + DML_CONSUMER_START);
>> + }
>> +
>> + /* make sure the dml is configured before dma is triggered */
>> + wmb();
>> +}
>> +
>> +static int of_get_dml_pipe_index(struct device_node *np, const char *name)
>> +{
>> + int index;
>> + struct of_phandle_args dma_spec;
>> +
>> + index = of_property_match_string(np, "dma-names", name);
>> +
>> + if (index < 0)
>> + return -ENODEV;
>> +
>> + if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,
>> + &dma_spec))
>> + return -ENODEV;
>> +
>> + if (dma_spec.args_count)
>> + return dma_spec.args[0];
>> +
>> + return -ENODEV;
>> +}
>> +
>> +/* Initialize the dml hardware connected to SD Card controller */
>> +int dml_hw_init(struct mmci_host *host, struct device_node *np)
>> +{
>> + u32 config;
>> + void __iomem *base;
>> + int consumer_id, producer_id;
>> +
>> + consumer_id = of_get_dml_pipe_index(np, "tx");
>> + producer_id = of_get_dml_pipe_index(np, "rx");
>> +
>> + if (producer_id < 0 || consumer_id < 0)
>> + return -ENODEV;
>> +
>> + base = host->base + DML_OFFSET;
>> +
>> + /* Reset the DML block */
>> + writel_relaxed(1, base + DML_SW_RESET);
>> +
>> + /* Disable the producer and consumer CRCI */
>> + config = (PRODUCER_CRCI_DISABLE | CONSUMER_CRCI_DISABLE);
>> + /*
>> + * Disable the bypass mode. Bypass mode will only be used
>> + * if data transfer is to happen in PIO mode and don't
>> + * want the BAM interface to connect with SDCC-DML.
>> + */
>> + config &= ~BYPASS;
>> + /*
>> + * Disable direct mode as we don't DML to MASTER the AHB bus.
>> + * BAM connected with DML should MASTER the AHB bus.
>> + */
>> + config &= ~DIRECT_MODE;
>> + /*
>> + * Disable infinite mode transfer as we won't be doing any
>> + * infinite size data transfers. All data transfer will be
>> + * of finite data size.
>> + */
>> + config &= ~INFINITE_CONS_TRANS;
>> + writel_relaxed(config, base + DML_CONFIG);
>> +
>> + /*
>> + * Initialize the logical BAM pipe size for producer
>> + * and consumer.
>> + */
>> + writel_relaxed(PRODUCER_PIPE_LOGICAL_SIZE,
>> + base + DML_PRODUCER_PIPE_LOGICAL_SIZE);
>> + writel_relaxed(CONSUMER_PIPE_LOGICAL_SIZE,
>> + base + DML_CONSUMER_PIPE_LOGICAL_SIZE);
>> +
>> + /* Initialize Producer/consumer pipe id */
>> + writel_relaxed(producer_id | (consumer_id << CONSUMER_PIPE_ID_SHFT),
>> + base + DML_PIPE_ID);
>> +
>> + /* Make sure dml initialization is finished */
>> + mb();
>> +
>> + return 0;
>> +}
>> +#else
>> +static inline int dml_hw_init(struct mmci_host *host, struct device_node *np)
>> +{
>> + return -EINVAL;
>> +}
>> +
>> +static inline void dml_start_xfer(struct mmci_host *host, struct mmc_data *data)
>> +{
>> +}
>> +#endif /* CONFIG_MMC_QCOM_DML */
>> +
>> static int dmaengine_setup(struct mmci_host *host)
>> {
>> const char *rxname, *txname;
>> diff --git a/drivers/mmc/host/mmci_qcom_dml.c b/drivers/mmc/host/mmci_qcom_dml.c
>> deleted file mode 100644
>> index 00750c9..0000000
>> --- a/drivers/mmc/host/mmci_qcom_dml.c
>> +++ /dev/null
>> @@ -1,177 +0,0 @@
>> -/*
>> - *
>> - * Copyright (c) 2011, The Linux Foundation. All rights reserved.
>> - *
>> - * This program is free software; you can redistribute it and/or modify
>> - * it under the terms of the GNU General Public License version 2 and
>> - * only version 2 as published by the Free Software Foundation.
>> - *
>> - * This program is distributed in the hope that it will be useful,
>> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> - * GNU General Public License for more details.
>> - *
>> - */
>> -#include <linux/of.h>
>> -#include <linux/of_dma.h>
>> -#include <linux/bitops.h>
>> -#include <linux/mmc/host.h>
>> -#include <linux/mmc/card.h>
>> -#include "mmci.h"
>> -
>> -/* Registers */
>> -#define DML_CONFIG 0x00
>> -#define PRODUCER_CRCI_MSK GENMASK(1, 0)
>> -#define PRODUCER_CRCI_DISABLE 0
>> -#define PRODUCER_CRCI_X_SEL BIT(0)
>> -#define PRODUCER_CRCI_Y_SEL BIT(1)
>> -#define CONSUMER_CRCI_MSK GENMASK(3, 2)
>> -#define CONSUMER_CRCI_DISABLE 0
>> -#define CONSUMER_CRCI_X_SEL BIT(2)
>> -#define CONSUMER_CRCI_Y_SEL BIT(3)
>> -#define PRODUCER_TRANS_END_EN BIT(4)
>> -#define BYPASS BIT(16)
>> -#define DIRECT_MODE BIT(17)
>> -#define INFINITE_CONS_TRANS BIT(18)
>> -
>> -#define DML_SW_RESET 0x08
>> -#define DML_PRODUCER_START 0x0c
>> -#define DML_CONSUMER_START 0x10
>> -#define DML_PRODUCER_PIPE_LOGICAL_SIZE 0x14
>> -#define DML_CONSUMER_PIPE_LOGICAL_SIZE 0x18
>> -#define DML_PIPE_ID 0x1c
>> -#define PRODUCER_PIPE_ID_SHFT 0
>> -#define PRODUCER_PIPE_ID_MSK GENMASK(4, 0)
>> -#define CONSUMER_PIPE_ID_SHFT 16
>> -#define CONSUMER_PIPE_ID_MSK GENMASK(20, 16)
>> -
>> -#define DML_PRODUCER_BAM_BLOCK_SIZE 0x24
>> -#define DML_PRODUCER_BAM_TRANS_SIZE 0x28
>> -
>> -/* other definitions */
>> -#define PRODUCER_PIPE_LOGICAL_SIZE 4096
>> -#define CONSUMER_PIPE_LOGICAL_SIZE 4096
>> -
>> -#define DML_OFFSET 0x800
>> -
>> -void dml_start_xfer(struct mmci_host *host, struct mmc_data *data)
>> -{
>> - u32 config;
>> - void __iomem *base = host->base + DML_OFFSET;
>> -
>> - if (data->flags & MMC_DATA_READ) {
>> - /* Read operation: configure DML for producer operation */
>> - /* Set producer CRCI-x and disable consumer CRCI */
>> - config = readl_relaxed(base + DML_CONFIG);
>> - config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_X_SEL;
>> - config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_DISABLE;
>> - writel_relaxed(config, base + DML_CONFIG);
>> -
>> - /* Set the Producer BAM block size */
>> - writel_relaxed(data->blksz, base + DML_PRODUCER_BAM_BLOCK_SIZE);
>> -
>> - /* Set Producer BAM Transaction size */
>> - writel_relaxed(data->blocks * data->blksz,
>> - base + DML_PRODUCER_BAM_TRANS_SIZE);
>> - /* Set Producer Transaction End bit */
>> - config = readl_relaxed(base + DML_CONFIG);
>> - config |= PRODUCER_TRANS_END_EN;
>> - writel_relaxed(config, base + DML_CONFIG);
>> - /* Trigger producer */
>> - writel_relaxed(1, base + DML_PRODUCER_START);
>> - } else {
>> - /* Write operation: configure DML for consumer operation */
>> - /* Set consumer CRCI-x and disable producer CRCI*/
>> - config = readl_relaxed(base + DML_CONFIG);
>> - config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_X_SEL;
>> - config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_DISABLE;
>> - writel_relaxed(config, base + DML_CONFIG);
>> - /* Clear Producer Transaction End bit */
>> - config = readl_relaxed(base + DML_CONFIG);
>> - config &= ~PRODUCER_TRANS_END_EN;
>> - writel_relaxed(config, base + DML_CONFIG);
>> - /* Trigger consumer */
>> - writel_relaxed(1, base + DML_CONSUMER_START);
>> - }
>> -
>> - /* make sure the dml is configured before dma is triggered */
>> - wmb();
>> -}
>> -
>> -static int of_get_dml_pipe_index(struct device_node *np, const char *name)
>> -{
>> - int index;
>> - struct of_phandle_args dma_spec;
>> -
>> - index = of_property_match_string(np, "dma-names", name);
>> -
>> - if (index < 0)
>> - return -ENODEV;
>> -
>> - if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,
>> - &dma_spec))
>> - return -ENODEV;
>> -
>> - if (dma_spec.args_count)
>> - return dma_spec.args[0];
>> -
>> - return -ENODEV;
>> -}
>> -
>> -/* Initialize the dml hardware connected to SD Card controller */
>> -int dml_hw_init(struct mmci_host *host, struct device_node *np)
>> -{
>> - u32 config;
>> - void __iomem *base;
>> - int consumer_id, producer_id;
>> -
>> - consumer_id = of_get_dml_pipe_index(np, "tx");
>> - producer_id = of_get_dml_pipe_index(np, "rx");
>> -
>> - if (producer_id < 0 || consumer_id < 0)
>> - return -ENODEV;
>> -
>> - base = host->base + DML_OFFSET;
>> -
>> - /* Reset the DML block */
>> - writel_relaxed(1, base + DML_SW_RESET);
>> -
>> - /* Disable the producer and consumer CRCI */
>> - config = (PRODUCER_CRCI_DISABLE | CONSUMER_CRCI_DISABLE);
>> - /*
>> - * Disable the bypass mode. Bypass mode will only be used
>> - * if data transfer is to happen in PIO mode and don't
>> - * want the BAM interface to connect with SDCC-DML.
>> - */
>> - config &= ~BYPASS;
>> - /*
>> - * Disable direct mode as we don't DML to MASTER the AHB bus.
>> - * BAM connected with DML should MASTER the AHB bus.
>> - */
>> - config &= ~DIRECT_MODE;
>> - /*
>> - * Disable infinite mode transfer as we won't be doing any
>> - * infinite size data transfers. All data transfer will be
>> - * of finite data size.
>> - */
>> - config &= ~INFINITE_CONS_TRANS;
>> - writel_relaxed(config, base + DML_CONFIG);
>> -
>> - /*
>> - * Initialize the logical BAM pipe size for producer
>> - * and consumer.
>> - */
>> - writel_relaxed(PRODUCER_PIPE_LOGICAL_SIZE,
>> - base + DML_PRODUCER_PIPE_LOGICAL_SIZE);
>> - writel_relaxed(CONSUMER_PIPE_LOGICAL_SIZE,
>> - base + DML_CONSUMER_PIPE_LOGICAL_SIZE);
>> -
>> - /* Initialize Producer/consumer pipe id */
>> - writel_relaxed(producer_id | (consumer_id << CONSUMER_PIPE_ID_SHFT),
>> - base + DML_PIPE_ID);
>> -
>> - /* Make sure dml initialization is finished */
>> - mb();
>> -
>> - return 0;
>> -}
>> diff --git a/drivers/mmc/host/mmci_qcom_dml.h b/drivers/mmc/host/mmci_qcom_dml.h
>> deleted file mode 100644
>> index 6e405d0..0000000
>> --- a/drivers/mmc/host/mmci_qcom_dml.h
>> +++ /dev/null
>> @@ -1,31 +0,0 @@
>> -/*
>> - *
>> - * Copyright (c) 2011, The Linux Foundation. All rights reserved.
>> - *
>> - * This program is free software; you can redistribute it and/or modify
>> - * it under the terms of the GNU General Public License version 2 and
>> - * only version 2 as published by the Free Software Foundation.
>> - *
>> - * This program is distributed in the hope that it will be useful,
>> - * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> - * GNU General Public License for more details.
>> - *
>> - */
>> -#ifndef __MMC_QCOM_DML_H__
>> -#define __MMC_QCOM_DML_H__
>> -
>> -#ifdef CONFIG_MMC_QCOM_DML
>> -int dml_hw_init(struct mmci_host *host, struct device_node *np);
>> -void dml_start_xfer(struct mmci_host *host, struct mmc_data *data);
>> -#else
>> -static inline int dml_hw_init(struct mmci_host *host, struct device_node *np)
>> -{
>> - return -ENOSYS;
>> -}
>> -static inline void dml_start_xfer(struct mmci_host *host, struct mmc_data *data)
>> -{
>> -}
>> -#endif /* CONFIG_MMC_QCOM_DML */
>> -
>> -#endif /* __MMC_QCOM_DML_H__ */
>> --
>> 2.7.4
>>
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