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From b360514edb4743cbf86fc377699c75e98b1264c7 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Thu, 16 Jun 2022 02:18:33 +0200
Subject: [PATCH 1/2] mtd: nand: raw: qcom_nandc: reorder qcom_nand_host struct

Reorder structs in nandc driver to save holes.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220616001835.24393-2-ansuelsmth@gmail.com
---
 drivers/mtd/nand/raw/qcom_nandc.c | 107 +++++++++++++++++-------------
 1 file changed, 62 insertions(+), 45 deletions(-)

--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -237,6 +237,9 @@ nandc_set_reg(chip, reg,                    \
  * @bam_ce - the array of BAM command elements
  * @cmd_sgl - sgl for NAND BAM command pipe
  * @data_sgl - sgl for NAND BAM consumer/producer pipe
+ * @last_data_desc - last DMA desc in data channel (tx/rx).
+ * @last_cmd_desc - last DMA desc in command channel.
+ * @txn_done - completion for NAND transfer.
  * @bam_ce_pos - the index in bam_ce which is available for next sgl
  * @bam_ce_start - the index in bam_ce which marks the start position ce
  *                for current sgl. It will be used for size calculation
@@ -249,14 +252,14 @@ nandc_set_reg(chip, reg,                  \
  * @rx_sgl_start - start index in data sgl for rx.
  * @wait_second_completion - wait for second DMA desc completion before making
  *                          the NAND transfer completion.
- * @txn_done - completion for NAND transfer.
- * @last_data_desc - last DMA desc in data channel (tx/rx).
- * @last_cmd_desc - last DMA desc in command channel.
  */
 struct bam_transaction {
        struct bam_cmd_element *bam_ce;
        struct scatterlist *cmd_sgl;
        struct scatterlist *data_sgl;
+       struct dma_async_tx_descriptor *last_data_desc;
+       struct dma_async_tx_descriptor *last_cmd_desc;
+       struct completion txn_done;
        u32 bam_ce_pos;
        u32 bam_ce_start;
        u32 cmd_sgl_pos;
@@ -266,25 +269,23 @@ struct bam_transaction {
        u32 rx_sgl_pos;
        u32 rx_sgl_start;
        bool wait_second_completion;
-       struct completion txn_done;
-       struct dma_async_tx_descriptor *last_data_desc;
-       struct dma_async_tx_descriptor *last_cmd_desc;
 };
 
 /*
  * This data type corresponds to the nand dma descriptor
+ * @dma_desc - low level DMA engine descriptor
  * @list - list for desc_info
- * @dir - DMA transfer direction
+ *
  * @adm_sgl - sgl which will be used for single sgl dma descriptor. Only used by
  *           ADM
  * @bam_sgl - sgl which will be used for dma descriptor. Only used by BAM
  * @sgl_cnt - number of SGL in bam_sgl. Only used by BAM
- * @dma_desc - low level DMA engine descriptor
+ * @dir - DMA transfer direction
  */
 struct desc_info {
+       struct dma_async_tx_descriptor *dma_desc;
        struct list_head node;
 
-       enum dma_data_direction dir;
        union {
                struct scatterlist adm_sgl;
                struct {
@@ -292,7 +293,7 @@ struct desc_info {
                        int sgl_cnt;
                };
        };
-       struct dma_async_tx_descriptor *dma_desc;
+       enum dma_data_direction dir;
 };
 
 /*
@@ -336,52 +337,64 @@ struct nandc_regs {
 /*
  * NAND controller data struct
  *
- * @controller:                        base controller structure
- * @host_list:                 list containing all the chips attached to the
- *                             controller
  * @dev:                       parent device
+ *
  * @base:                      MMIO base
- * @base_phys:                 physical base address of controller registers
- * @base_dma:                  dma base address of controller registers
+ *
  * @core_clk:                  controller clock
  * @aon_clk:                   another controller clock
  *
+ * @regs:                      a contiguous chunk of memory for DMA register
+ *                             writes. contains the register values to be
+ *                             written to controller
+ *
+ * @props:                     properties of current NAND controller,
+ *                             initialized via DT match data
+ *
+ * @controller:                        base controller structure
+ * @host_list:                 list containing all the chips attached to the
+ *                             controller
+ *
  * @chan:                      dma channel
  * @cmd_crci:                  ADM DMA CRCI for command flow control
  * @data_crci:                 ADM DMA CRCI for data flow control
+ *
  * @desc_list:                 DMA descriptor list (list of desc_infos)
  *
  * @data_buffer:               our local DMA buffer for page read/writes,
  *                             used when we can't use the buffer provided
  *                             by upper layers directly
- * @buf_size/count/start:      markers for chip->legacy.read_buf/write_buf
- *                             functions
  * @reg_read_buf:              local buffer for reading back registers via DMA
+ *
+ * @base_phys:                 physical base address of controller registers
+ * @base_dma:                  dma base address of controller registers
  * @reg_read_dma:              contains dma address for register read buffer
- * @reg_read_pos:              marker for data read in reg_read_buf
  *
- * @regs:                      a contiguous chunk of memory for DMA register
- *                             writes. contains the register values to be
- *                             written to controller
- * @cmd1/vld:                  some fixed controller register values
- * @props:                     properties of current NAND controller,
- *                             initialized via DT match data
+ * @buf_size/count/start:      markers for chip->legacy.read_buf/write_buf
+ *                             functions
  * @max_cwperpage:             maximum QPIC codewords required. calculated
  *                             from all connected NAND devices pagesize
+ *
+ * @reg_read_pos:              marker for data read in reg_read_buf
+ *
+ * @cmd1/vld:                  some fixed controller register values
  */
 struct qcom_nand_controller {
-       struct nand_controller controller;
-       struct list_head host_list;
-
        struct device *dev;
 
        void __iomem *base;
-       phys_addr_t base_phys;
-       dma_addr_t base_dma;
 
        struct clk *core_clk;
        struct clk *aon_clk;
 
+       struct nandc_regs *regs;
+       struct bam_transaction *bam_txn;
+
+       const struct qcom_nandc_props *props;
+
+       struct nand_controller controller;
+       struct list_head host_list;
+
        union {
                /* will be used only by QPIC for BAM DMA */
                struct {
@@ -399,22 +412,22 @@ struct qcom_nand_controller {
        };
 
        struct list_head desc_list;
-       struct bam_transaction *bam_txn;
 
        u8              *data_buffer;
+       __le32          *reg_read_buf;
+
+       phys_addr_t base_phys;
+       dma_addr_t base_dma;
+       dma_addr_t reg_read_dma;
+
        int             buf_size;
        int             buf_count;
        int             buf_start;
        unsigned int    max_cwperpage;
 
-       __le32 *reg_read_buf;
-       dma_addr_t reg_read_dma;
        int reg_read_pos;
 
-       struct nandc_regs *regs;
-
        u32 cmd1, vld;
-       const struct qcom_nandc_props *props;
 };
 
 /*
@@ -430,19 +443,21 @@ struct qcom_nand_controller {
  *                             and reserved bytes
  * @cw_data:                   the number of bytes within a codeword protected
  *                             by ECC
- * @use_ecc:                   request the controller to use ECC for the
- *                             upcoming read/write
- * @bch_enabled:               flag to tell whether BCH ECC mode is used
  * @ecc_bytes_hw:              ECC bytes used by controller hardware for this
  *                             chip
- * @status:                    value to be returned if NAND_CMD_STATUS command
- *                             is executed
+ *
  * @last_command:              keeps track of last command on this chip. used
  *                             for reading correct status
  *
  * @cfg0, cfg1, cfg0_raw..:    NANDc register configurations needed for
  *                             ecc/non-ecc mode for the current nand flash
  *                             device
+ *
+ * @status:                    value to be returned if NAND_CMD_STATUS command
+ *                             is executed
+ * @use_ecc:                   request the controller to use ECC for the
+ *                             upcoming read/write
+ * @bch_enabled:               flag to tell whether BCH ECC mode is used
  */
 struct qcom_nand_host {
        struct nand_chip chip;
@@ -451,12 +466,10 @@ struct qcom_nand_host {
        int cs;
        int cw_size;
        int cw_data;
-       bool use_ecc;
-       bool bch_enabled;
        int ecc_bytes_hw;
        int spare_bytes;
        int bbm_size;
-       u8 status;
+
        int last_command;
 
        u32 cfg0, cfg1;
@@ -465,23 +478,27 @@ struct qcom_nand_host {
        u32 ecc_bch_cfg;
        u32 clrflashstatus;
        u32 clrreadstatus;
+
+       u8 status;
+       bool use_ecc;
+       bool bch_enabled;
 };
 
 /*
  * This data type corresponds to the NAND controller properties which varies
  * among different NAND controllers.
  * @ecc_modes - ecc mode for NAND
+ * @dev_cmd_reg_start - NAND_DEV_CMD_* registers starting offset
  * @is_bam - whether NAND controller is using BAM
  * @is_qpic - whether NAND CTRL is part of qpic IP
  * @qpic_v2 - flag to indicate QPIC IP version 2
- * @dev_cmd_reg_start - NAND_DEV_CMD_* registers starting offset
  */
 struct qcom_nandc_props {
        u32 ecc_modes;
+       u32 dev_cmd_reg_start;
        bool is_bam;
        bool is_qpic;
        bool qpic_v2;
-       u32 dev_cmd_reg_start;
 };
 
 /* Frees the BAM transaction memory */