Re: [PATCH 3/3] nand: brcmnand: support v2.1-v2.2 controllers

Miquel Raynal
2020-05-11T17:44:28Z

Hi Álvaro,

Álvaro Fernández Rojas <noltari@gmail.com> wrote on Sun, 10 May 2020
17:14:06 +0200:

> Tested on Netgear DGND3700v2 (BCM6362 with v2.2 controller).

I'd propose to do this in two steps:

First rename what needs to be rename to be more accurate without adding
anything specific to this version of the IP, then, in another patch,
just add the necessary bits.

>
> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
> ---
> drivers/mtd/nand/raw/brcmnand/brcmnand.c | 76 +++++++++++++++++++++---
> 1 file changed, 67 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> index 72b268d8e3a4..718c601d0e59 100644
> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> @@ -338,6 +338,36 @@ enum brcmnand_reg {
> BRCMNAND_FC_BASE,
> };
>
> +/* BRCMNAND v2.1-v2.2 */
> +static const u16 brcmnand_regs_v21[] = {
> + [BRCMNAND_CMD_START] = 0x04,
> + [BRCMNAND_CMD_EXT_ADDRESS] = 0x08,
> + [BRCMNAND_CMD_ADDRESS] = 0x0c,
> + [BRCMNAND_INTFC_STATUS] = 0x5c,
> + [BRCMNAND_CS_SELECT] = 0x14,
> + [BRCMNAND_CS_XOR] = 0x18,
> + [BRCMNAND_LL_OP] = 0,
> + [BRCMNAND_CS0_BASE] = 0x40,
> + [BRCMNAND_CS1_BASE] = 0,
> + [BRCMNAND_CORR_THRESHOLD] = 0,
> + [BRCMNAND_CORR_THRESHOLD_EXT] = 0,
> + [BRCMNAND_UNCORR_COUNT] = 0,
> + [BRCMNAND_CORR_COUNT] = 0,
> + [BRCMNAND_CORR_EXT_ADDR] = 0x60,
> + [BRCMNAND_CORR_ADDR] = 0x64,
> + [BRCMNAND_UNCORR_EXT_ADDR] = 0x68,
> + [BRCMNAND_UNCORR_ADDR] = 0x6c,
> + [BRCMNAND_SEMAPHORE] = 0x50,
> + [BRCMNAND_ID] = 0x54,
> + [BRCMNAND_ID_EXT] = 0,
> + [BRCMNAND_LL_RDATA] = 0,
> + [BRCMNAND_OOB_READ_BASE] = 0x20,
> + [BRCMNAND_OOB_READ_10_BASE] = 0,
> + [BRCMNAND_OOB_WRITE_BASE] = 0x30,
> + [BRCMNAND_OOB_WRITE_10_BASE] = 0,
> + [BRCMNAND_FC_BASE] = 0x200,
> +};
> +
> /* BRCMNAND v3.3-v4.0 */
> static const u16 brcmnand_regs_v33[] = {
> [BRCMNAND_CMD_START] = 0x04,
> @@ -571,12 +601,16 @@ static int brcmnand_revision_init(struct brcmnand_controller *ctrl)
> {
> static const unsigned int block_sizes_v6[] = { 8, 16, 128, 256, 512, 1024, 2048, 0 };
> static const unsigned int block_sizes_v4[] = { 16, 128, 8, 512, 256, 1024, 2048, 0 };
> - static const unsigned int page_sizes[] = { 512, 2048, 4096, 8192, 0 };
> + static const unsigned int block_sizes_v2_2[] = { 16, 128, 8, 512, 256, 0 };
> + static const unsigned int block_sizes[] = { 16, 128, 8, 512, 0 };
> + static const unsigned int page_sizes_v3_4[] = { 512, 2048, 4096, 8192, 0 };
> + static const unsigned int page_sizes_v2_2[] = { 512, 2048, 4096, 0 };
> + static const unsigned int page_sizes[] = { 512, 2048, 0 };

Can you name a version everywhere?

>
> ctrl->nand_version = nand_readreg(ctrl, 0) & 0xffff;
>
> - /* Only support v4.0+? */
> - if (ctrl->nand_version < 0x0400) {
> + /* Only support v2.1+ */
> + if (ctrl->nand_version < 0x0201) {
> dev_err(ctrl->dev, "version %#x not supported\n",
> ctrl->nand_version);
> return -ENODEV;
> @@ -593,6 +627,8 @@ static int brcmnand_revision_init(struct brcmnand_controller *ctrl)
> ctrl->reg_offsets = brcmnand_regs_v50;
> else if (ctrl->nand_version >= 0x0303)
> ctrl->reg_offsets = brcmnand_regs_v33;
> + else if (ctrl->nand_version >= 0x0201)
> + ctrl->reg_offsets = brcmnand_regs_v21;
>
> /* Chip-select stride */
> if (ctrl->nand_version >= 0x0701)
> @@ -618,14 +654,27 @@ static int brcmnand_revision_init(struct brcmnand_controller *ctrl)
> ctrl->max_page_size = 16 * 1024;
> ctrl->max_block_size = 2 * 1024 * 1024;
> } else {
> - ctrl->page_sizes = page_sizes;
> + if (ctrl->nand_version >= 0x0304)
> + ctrl->page_sizes = page_sizes_v3_4;
> + else if (ctrl->nand_version >= 0x0202)
> + ctrl->page_sizes = page_sizes_v2_2;
> + else
> + ctrl->page_sizes = page_sizes;
> +
> if (ctrl->nand_version >= 0x0600)
> ctrl->block_sizes = block_sizes_v6;
> - else
> + else if (ctrl->nand_version >= 0x0400)
> ctrl->block_sizes = block_sizes_v4;
> + else if (ctrl->nand_version >= 0x0202)
> + ctrl->block_sizes = block_sizes_v2_2;
> + else
> + ctrl->block_sizes = block_sizes;
>
> if (ctrl->nand_version < 0x0400) {
> - ctrl->max_page_size = 4096;
> + if (ctrl->nand_version < 0x0202)
> + ctrl->max_page_size = 2048;
> + else
> + ctrl->max_page_size = 4096;
> ctrl->max_block_size = 512 * 1024;
> }
> }
> @@ -811,6 +860,9 @@ static void brcmnand_wr_corr_thresh(struct brcmnand_host *host, u8 val)
> enum brcmnand_reg reg = BRCMNAND_CORR_THRESHOLD;
> int cs = host->cs;
>
> + if (!ctrl->reg_offsets[reg])
> + return;
> +
> if (ctrl->nand_version == 0x0702)
> bits = 7;
> else if (ctrl->nand_version >= 0x0600)
> @@ -869,8 +921,10 @@ static inline u32 brcmnand_spare_area_mask(struct brcmnand_controller *ctrl)
> return GENMASK(7, 0);
> else if (ctrl->nand_version >= 0x0600)
> return GENMASK(6, 0);
> - else
> + else if (ctrl->nand_version >= 0x0303)
> return GENMASK(5, 0);
> + else
> + return GENMASK(4, 0);
> }
>
> #define NAND_ACC_CONTROL_ECC_SHIFT 16
> @@ -2390,9 +2444,11 @@ static int brcmnand_set_cfg(struct brcmnand_host *host,
>
> tmp = nand_readreg(ctrl, acc_control_offs);
> tmp &= ~brcmnand_ecc_level_mask(ctrl);
> - tmp |= cfg->ecc_level << NAND_ACC_CONTROL_ECC_SHIFT;
> tmp &= ~brcmnand_spare_area_mask(ctrl);
> - tmp |= cfg->spare_area_size;
> + if (ctrl->nand_version >= 0x0302) {
> + tmp |= cfg->ecc_level << NAND_ACC_CONTROL_ECC_SHIFT;
> + tmp |= cfg->spare_area_size;
> + }
> nand_writereg(ctrl, acc_control_offs, tmp);
>
> brcmnand_set_sector_size_1k(host, cfg->sector_size_1k);
> @@ -2766,6 +2822,8 @@ const struct dev_pm_ops brcmnand_pm_ops = {
> EXPORT_SYMBOL_GPL(brcmnand_pm_ops);
>
> static const struct of_device_id brcmnand_of_match[] = {
> + { .compatible = "brcm,brcmnand-v2.1" },
> + { .compatible = "brcm,brcmnand-v2.2" },
> { .compatible = "brcm,brcmnand-v4.0" },
> { .compatible = "brcm,brcmnand-v5.0" },
> { .compatible = "brcm,brcmnand-v6.0" },

You should also document these new bindings in a separate patch
(before this one).

Thanks,
Miquèl