Re: [PATCH 02/19] mmc: mmci: merge qcom dml feature into mmci dma

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On 07/05/2018 05:26 PM, Ulf Hansson wrote:
On 12 June 2018 at 15:14, Ludovic Barre <ludovic.Barre@xxxxxx> wrote:
From: Ludovic Barre <ludovic.barre@xxxxxx>

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@xxxxxx>
---
  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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