target/linux/ipq806x/patches-4.9/860-qcom-mtd-nand-Add-bam_dma-support-in-qcom_nand-drive.patch

   1 From 074036f9de6b8c5fc642e8e2540950f6a35aa804 Mon Sep 17 00:00:00 2001
   2 From: Ram Chandra Jangir <rjangir@codeaurora.org>
   3 Date: Thu, 20 Apr 2017 10:31:10 +0530
   4 Subject: [PATCH] qcom: mtd: nand: Add bam_dma support in qcom_nand driver
   5
   6 The current driver only support ADM DMA so this patch adds the
   7 BAM DMA support in current NAND driver with compatible string
   8 qcom,ebi2-nandc-bam.
   9 Added bam channels and data buffers, NAND BAM uses 3 channels:
  10 command, data tx and data rx, while ADM uses only single channel.
  11 So this patch adds the BAM channel in device tree and using the
  12 same in NAND driver allocation function.
  13
  14 Signed-off-by: Ram Chandra Jangir <rjangir@codeaurora.org>
  15 ---
  16  .../devicetree/bindings/mtd/qcom_nandc.txt         |  69 +++++++--
  17  drivers/mtd/nand/qcom_nandc.c                      | 160 +++++++++++++++++----
  18  2 files changed, 190 insertions(+), 39 deletions(-)
  19
  20 --- a/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
  21 +++ b/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
  22 @@ -1,21 +1,26 @@
  23  * Qualcomm NAND controller
  24
  25  Required properties:
  26 -- compatible:          should be "qcom,ipq806x-nand"
  27 +- compatible:          "qcom,ipq806x-nand" for IPQ8064 which uses
  28 +                       ADM DMA.
  29 +                       "qcom,ebi2-nand-bam" - nand drivers using BAM DMA
  30 +                       like IPQ4019.
  31  - reg:                 MMIO address range
  32  - clocks:              must contain core clock and always on clock
  33  - clock-names:         must contain "core" for the core clock and "aon" for the
  34                         always on clock
  35  - dmas:                        DMA specifier, consisting of a phandle to the ADM DMA
  36 -                       controller node and the channel number to be used for
  37 -                       NAND. Refer to dma.txt and qcom_adm.txt for more details
  38 -- dma-names:           must be "rxtx"
  39 -- qcom,cmd-crci:       must contain the ADM command type CRCI block instance
  40 -                       number specified for the NAND controller on the given
  41 -                       platform
  42 -- qcom,data-crci:      must contain the ADM data type CRCI block instance
  43 -                       number specified for the NAND controller on the given
  44 -                       platform
  45 +                       or BAM DMA controller node and the channel number to
  46 +                       be used for NAND. Refer to dma.txt, qcom_adm.txt(ADM)
  47 +                       and qcom_bam_dma.txt(BAM) for more details
  48 +- dma-names:           "rxtx" - ADM
  49 +                       "tx", "rx", "cmd" - BAM
  50 +- qcom,cmd-crci:       Only required for ADM DMA. must contain the ADM command
  51 +                       type CRCI block instance number specified for the NAND
  52 +                       controller on the given platform.
  53 +- qcom,data-crci:      Only required for ADM DMA. must contain the ADM data
  54 +                       type CRCI block instance number specified for the NAND
  55 +                       controller on the given platform.
  56  - #address-cells:      <1> - subnodes give the chip-select number
  57  - #size-cells:         <0>
  58
  59 @@ -44,7 +49,7 @@ partition.txt for more detail.
  60  Example:
  61
  62  nand@1ac00000 {
  63 -       compatible = "qcom,ebi2-nandc";
  64 +       compatible = "qcom,ipq806x-nand","qcom.qcom_nand";
  65         reg = <0x1ac00000 0x800>;
  66
  67         clocks = <&gcc EBI2_CLK>,
  68 @@ -58,6 +63,48 @@ nand@1ac00000 {
  69
  70         #address-cells = <1>;
  71         #size-cells = <0>;
  72 +
  73 +       nandcs@0 {
  74 +               compatible = "qcom,nandcs";
  75 +               reg = <0>;
  76 +
  77 +               nand-ecc-strength = <4>;
  78 +               nand-ecc-step-size = <512>;
  79 +               nand-bus-width = <8>;
  80 +
  81 +               partitions {
  82 +                       compatible = "fixed-partitions";
  83 +                       #address-cells = <1>;
  84 +                       #size-cells = <1>;
  85 +
  86 +                       partition@0 {
  87 +                               label = "boot-nand";
  88 +                               reg = <0 0x58a0000>;
  89 +                       };
  90 +
  91 +                       partition@58a0000 {
  92 +                               label = "fs-nand";
  93 +                               reg = <0x58a0000 0x4000000>;
  94 +                       };
  95 +               };
  96 +       };
  97 +};
  98 +
  99 +nand@79B0000 {
 100 +       compatible = "qcom,ebi2-nandc-bam";
 101 +       reg = <0x79B0000 0x1000>;
 102 +
 103 +       clocks = <&gcc EBI2_CLK>,
 104 +                <&gcc EBI2_AON_CLK>;
 105 +       clock-names = "core", "aon";
 106 +
 107 +       dmas = <&qpicbam 0>,
 108 +               <&qpicbam 1>,
 109 +               <&qpicbam 2>;
 110 +       dma-names = "tx", "rx", "cmd";
 111 +
 112 +       #address-cells = <1>;
 113 +       #size-cells = <0>;
 114
 115         nandcs@0 {
 116                 compatible = "qcom,nandcs";
 117 --- a/drivers/mtd/nand/qcom_nandc.c
 118 +++ b/drivers/mtd/nand/qcom_nandc.c
 119 @@ -234,6 +234,7 @@ struct nandc_regs {
 120   *                             by upper layers directly
 121   * @buf_size/count/start:      markers for chip->read_buf/write_buf functions
 122   * @reg_read_buf:              local buffer for reading back registers via DMA
 123 + * @reg_read_buf_phys:         contains dma address for register read buffer
 124   * @reg_read_pos:              marker for data read in reg_read_buf
 125   *
 126   * @regs:                      a contiguous chunk of memory for DMA register
 127 @@ -242,7 +243,10 @@ struct nandc_regs {
 128   * @cmd1/vld:                  some fixed controller register values
 129   * @ecc_modes:                 supported ECC modes by the current controller,
 130   *                             initialized via DT match data
 131 - */
 132 + * @bch_enabled:               flag to tell whether BCH or RS ECC mode is used
 133 + * @dma_bam_enabled:           flag to tell whether nand controller is using
 134 + *                             bam dma
 135 +*/
 136  struct qcom_nand_controller {
 137         struct nand_hw_control controller;
 138         struct list_head host_list;
 139 @@ -255,17 +259,28 @@ struct qcom_nand_controller {
 140         struct clk *core_clk;
 141         struct clk *aon_clk;
 142
 143 -       struct dma_chan *chan;
 144 -       unsigned int cmd_crci;
 145 -       unsigned int data_crci;
 146         struct list_head desc_list;
 147 +       union {
 148 +               struct {
 149 +                       struct dma_chan *tx_chan;
 150 +                       struct dma_chan *rx_chan;
 151 +                       struct dma_chan *cmd_chan;
 152 +               };
 153 +               struct {
 154 +                       struct dma_chan *chan;
 155 +                       unsigned int cmd_crci;
 156 +                       unsigned int data_crci;
 157 +               };
 158 +       };
 159
 160         u8              *data_buffer;
 161 +       bool            dma_bam_enabled;
 162         int             buf_size;
 163         int             buf_count;
 164         int             buf_start;
 165
 166         __le32 *reg_read_buf;
 167 +       dma_addr_t reg_read_buf_phys;
 168         int reg_read_pos;
 169
 170         struct nandc_regs *regs;
 171 @@ -324,6 +339,17 @@ struct qcom_nand_host {
 172         u32 clrreadstatus;
 173  };
 174
 175 +/*
 176 + * This data type corresponds to the nand driver data which will be used at
 177 + * driver probe time
 178 + * @ecc_modes - ecc mode for nand
 179 + * @dma_bam_enabled - whether this driver is using bam
 180 + */
 181 +struct qcom_nand_driver_data {
 182 +       u32 ecc_modes;
 183 +       bool dma_bam_enabled;
 184 +};
 185 +
 186  static inline struct qcom_nand_host *to_qcom_nand_host(struct nand_chip *chip)
 187  {
 188         return container_of(chip, struct qcom_nand_host, chip);
 189 @@ -1949,16 +1975,46 @@ static int qcom_nandc_alloc(struct qcom_
 190         if (!nandc->regs)
 191                 return -ENOMEM;
 192
 193 -       nandc->reg_read_buf = devm_kzalloc(nandc->dev,
 194 -                               MAX_REG_RD * sizeof(*nandc->reg_read_buf),
 195 -                               GFP_KERNEL);
 196 -       if (!nandc->reg_read_buf)
 197 -               return -ENOMEM;
 198 +       if (!nandc->dma_bam_enabled) {
 199 +               nandc->reg_read_buf = devm_kzalloc(nandc->dev,
 200 +                                       MAX_REG_RD *
 201 +                                       sizeof(*nandc->reg_read_buf),
 202 +                                       GFP_KERNEL);
 203
 204 -       nandc->chan = dma_request_slave_channel(nandc->dev, "rxtx");
 205 -       if (!nandc->chan) {
 206 -               dev_err(nandc->dev, "failed to request slave channel\n");
 207 -               return -ENODEV;
 208 +               if (!nandc->reg_read_buf)
 209 +                       return -ENOMEM;
 210 +
 211 +               nandc->chan = dma_request_slave_channel(nandc->dev, "rxtx");
 212 +               if (!nandc->chan) {
 213 +                       dev_err(nandc->dev, "failed to request slave channel\n");
 214 +                       return -ENODEV;
 215 +               }
 216 +       } else {
 217 +               nandc->reg_read_buf = dmam_alloc_coherent(nandc->dev,
 218 +                                       MAX_REG_RD *
 219 +                                       sizeof(*nandc->reg_read_buf),
 220 +                                       &nandc->reg_read_buf_phys, GFP_KERNEL);
 221 +
 222 +               if (!nandc->reg_read_buf)
 223 +                       return -ENOMEM;
 224 +
 225 +               nandc->tx_chan = dma_request_slave_channel(nandc->dev, "tx");
 226 +               if (!nandc->tx_chan) {
 227 +                       dev_err(nandc->dev, "failed to request tx channel\n");
 228 +                       return -ENODEV;
 229 +               }
 230 +
 231 +               nandc->rx_chan = dma_request_slave_channel(nandc->dev, "rx");
 232 +               if (!nandc->rx_chan) {
 233 +                       dev_err(nandc->dev, "failed to request rx channel\n");
 234 +                       return -ENODEV;
 235 +               }
 236 +
 237 +               nandc->cmd_chan = dma_request_slave_channel(nandc->dev, "cmd");
 238 +               if (!nandc->cmd_chan) {
 239 +                       dev_err(nandc->dev, "failed to request cmd channel\n");
 240 +                       return -ENODEV;
 241 +               }
 242         }
 243
 244         INIT_LIST_HEAD(&nandc->desc_list);
 245 @@ -1971,8 +2027,35 @@ static int qcom_nandc_alloc(struct qcom_
 246
 247  static void qcom_nandc_unalloc(struct qcom_nand_controller *nandc)
 248  {
 249 -       dma_release_channel(nandc->chan);
 250 -}
 251 +       if (nandc->dma_bam_enabled) {
 252 +               if (nandc->tx_chan)
 253 +                       dma_release_channel(nandc->tx_chan);
 254 +
 255 +               if (nandc->rx_chan)
 256 +                       dma_release_channel(nandc->rx_chan);
 257 +
 258 +               if (nandc->cmd_chan)
 259 +                       dma_release_channel(nandc->tx_chan);
 260 +
 261 +               if (nandc->reg_read_buf)
 262 +                       dmam_free_coherent(nandc->dev, MAX_REG_RD *
 263 +                               sizeof(*nandc->reg_read_buf),
 264 +                               nandc->reg_read_buf,
 265 +                               nandc->reg_read_buf_phys);
 266 +       } else {
 267 +               if (nandc->chan)
 268 +                       dma_release_channel(nandc->chan);
 269 +
 270 +               if (nandc->reg_read_buf)
 271 +                       devm_kfree(nandc->dev, nandc->reg_read_buf);
 272 +       }
 273 +
 274 +       if (nandc->regs)
 275 +               devm_kfree(nandc->dev, nandc->regs);
 276 +
 277 +       if (nandc->data_buffer)
 278 +               devm_kfree(nandc->dev, nandc->data_buffer);
 279 + }
 280
 281  /* one time setup of a few nand controller registers */
 282  static int qcom_nandc_setup(struct qcom_nand_controller *nandc)
 283 @@ -2010,6 +2093,8 @@ static int qcom_nand_host_init(struct qc
 284         mtd->name = devm_kasprintf(dev, GFP_KERNEL, "qcom_nand.%d", host->cs);
 285         mtd->owner = THIS_MODULE;
 286         mtd->dev.parent = dev;
 287 +       mtd->priv = chip;
 288 +       chip->priv = nandc;
 289
 290         chip->cmdfunc           = qcom_nandc_command;
 291         chip->select_chip       = qcom_nandc_select_chip;
 292 @@ -2057,16 +2142,20 @@ static int qcom_nandc_parse_dt(struct pl
 293         struct device_node *np = nandc->dev->of_node;
 294         int ret;
 295
 296 -       ret = of_property_read_u32(np, "qcom,cmd-crci", &nandc->cmd_crci);
 297 -       if (ret) {
 298 -               dev_err(nandc->dev, "command CRCI unspecified\n");
 299 -               return ret;
 300 -       }
 301 +       if (!nandc->dma_bam_enabled) {
 302 +               ret = of_property_read_u32(np, "qcom,cmd-crci",
 303 +                               &nandc->cmd_crci);
 304 +               if (ret) {
 305 +                       dev_err(nandc->dev, "command CRCI unspecified\n");
 306 +                       return ret;
 307 +               }
 308
 309 -       ret = of_property_read_u32(np, "qcom,data-crci", &nandc->data_crci);
 310 -       if (ret) {
 311 -               dev_err(nandc->dev, "data CRCI unspecified\n");
 312 -               return ret;
 313 +               ret = of_property_read_u32(np, "qcom,data-crci",
 314 +                               &nandc->data_crci);
 315 +               if (ret) {
 316 +                       dev_err(nandc->dev, "data CRCI unspecified\n");
 317 +                       return ret;
 318 +               }
 319         }
 320
 321         return 0;
 322 @@ -2081,6 +2170,7 @@ static int qcom_nandc_probe(struct platf
 323         struct device_node *dn = dev->of_node, *child;
 324         struct resource *res;
 325         int ret;
 326 +       struct qcom_nand_driver_data *driver_data;
 327
 328         nandc = devm_kzalloc(&pdev->dev, sizeof(*nandc), GFP_KERNEL);
 329         if (!nandc)
 330 @@ -2095,7 +2185,10 @@ static int qcom_nandc_probe(struct platf
 331                 return -ENODEV;
 332         }
 333
 334 -       nandc->ecc_modes = (unsigned long)dev_data;
 335 +       driver_data = (struct qcom_nand_driver_data *)dev_data;
 336 +
 337 +       nandc->ecc_modes = driver_data->ecc_modes;
 338 +       nandc->dma_bam_enabled = driver_data->dma_bam_enabled;
 339
 340         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 341         nandc->base = devm_ioremap_resource(dev, res);
 342 @@ -2187,7 +2280,15 @@ static int qcom_nandc_remove(struct plat
 343         return 0;
 344  }
 345
 346 -#define EBI2_NANDC_ECC_MODES   (ECC_RS_4BIT | ECC_BCH_8BIT)
 347 +struct qcom_nand_driver_data ebi2_nandc_bam_data = {
 348 +       .ecc_modes = (ECC_BCH_4BIT | ECC_BCH_8BIT),
 349 +       .dma_bam_enabled = true,
 350 +};
 351 +
 352 +struct qcom_nand_driver_data ebi2_nandc_data = {
 353 +       .ecc_modes = (ECC_RS_4BIT | ECC_BCH_8BIT),
 354 +       .dma_bam_enabled = false,
 355 +};
 356
 357  /*
 358   * data will hold a struct pointer containing more differences once we support
 359 @@ -2195,7 +2296,10 @@ static int qcom_nandc_remove(struct plat
 360   */
 361  static const struct of_device_id qcom_nandc_of_match[] = {
 362         {       .compatible = "qcom,ipq806x-nand",
 363 -               .data = (void *)EBI2_NANDC_ECC_MODES,
 364 +               .data = (void *) &ebi2_nandc_data,
 365 +       },
 366 +       {       .compatible = "qcom,ebi2-nandc-bam",
 367 +               .data = (void *) &ebi2_nandc_bam_data,
 368         },
 369         {}
 370  };