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Message-ID: <1702074adb9105a61971a3cb5867b7ed@agner.ch>
Date: Mon, 04 Jun 2018 22:56:20 +0200
From: Stefan Agner <stefan@...er.ch>
To: Randolph Maaßen <gaireg@...reg.de>
Cc: boris.brezillon@...tlin.com, dwmw2@...radead.org,
computersforpeace@...il.com, marek.vasut@...il.com,
robh+dt@...nel.org, mark.rutland@....com, thierry.reding@...il.com,
dev@...xeye.de, miquel.raynal@...tlin.com, richard@....at,
marcel@...wiler.com, krzk@...nel.org, digetx@...il.com,
benjamin.lindqvist@...ian.se, jonathanh@...dia.com,
pdeschrijver@...dia.com, pgaikwad@...dia.com, mirza.krak@...il.com,
linux-mtd@...ts.infradead.org, linux-tegra@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/6] mtd: rawnand: add NVIDIA Tegra NAND Flash
controller driver
Hi Randolph,
On 04.06.2018 19:16, Randolph Maaßen wrote:
> Am Freitag, den 01.06.2018, 00:16 +0200 schrieb Stefan Agner:
>> Add support for the NAND flash controller found on NVIDIA
>> Tegra 2 SoCs. This implementation does not make use of the
>> command queue feature. Regular operations/data transfers are
>> done in PIO mode. Page read/writes with hardware ECC make
>> use of the DMA for data transfer.
>>
>> Signed-off-by: Lucas Stach <dev@...xeye.de>
>> Signed-off-by: Stefan Agner <stefan@...er.ch>
>> ---
>> MAINTAINERS | 7 +
>> drivers/mtd/nand/raw/Kconfig | 6 +
>> drivers/mtd/nand/raw/Makefile | 1 +
>> drivers/mtd/nand/raw/tegra_nand.c | 1143
>> +++++++++++++++++++++++++++++
>> 4 files changed, 1157 insertions(+)
>> create mode 100644 drivers/mtd/nand/raw/tegra_nand.c
>>
[...]
>> +static int tegra_nand_chips_init(struct device *dev,
>> + struct tegra_nand_controller *ctrl)
>> +{
>> + struct device_node *np = dev->of_node;
>> + struct device_node *np_nand;
>> + int nchips = of_get_child_count(np);
>> + struct tegra_nand_chip *nand;
>> + struct mtd_info *mtd;
>> + struct nand_chip *chip;
>> + unsigned long config, bch_config = 0;
>> + int bits_per_step;
>> + int ret;
>> +
>> + if (nchips != 1) {
>> + dev_err(dev, "Currently only one NAND chip
>> supported\n");
>> + return -EINVAL;
>> + }
>> +
>> + np_nand = of_get_next_child(np, NULL);
>> +
>> + nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
>> + if (!nand)
>> + return -ENOMEM;
>> +
>> + nand->wp_gpio = devm_gpiod_get_optional(dev, "wp",
>> GPIOD_OUT_LOW);
>> +
>> + if (IS_ERR(nand->wp_gpio)) {
>> + ret = PTR_ERR(nand->wp_gpio);
>> + dev_err(dev, "Failed to request WP GPIO: %d\n",
>> ret);
>> + return ret;
>> + }
>> +
>> + chip = &nand->chip;
>> + chip->controller = &ctrl->controller;
>> +
>> + mtd = nand_to_mtd(chip);
>> +
>> + mtd->dev.parent = dev;
>> + if (!mtd->name)
>> + mtd->name = "tegra_nand";
>> + mtd->owner = THIS_MODULE;
>> +
>> + nand_set_flash_node(chip, np_nand);
>
> Hi,
> i just tried this driver and it works great so far, thanks.
> I just found, that assigning the of node after setting the mtd->name
> makes it impossible to assign a name via devicetree label. I have read
> the discussion about the label on this list, so I'm curious if this is
> intentional? Setting mtd->name after nand_set_flash_node() enables the
> label parameter.
>
Hm, good catch. No that was not intentional. The name indeed should be
assigned after the call to nand_set_flash_node. Will fix this in the
next revision.
>> +
>> + chip->options = NAND_NO_SUBPAGE_WRITE |
>> NAND_USE_BOUNCE_BUFFER;
>> + chip->exec_op = tegra_nand_exec_op;
>> + chip->select_chip = tegra_nand_select_chip;
>> + chip->setup_data_interface =
>> tegra_nand_setup_data_interface;
>> +
>> + ret = nand_scan_ident(mtd, 1, NULL);
>> + if (ret)
>> + return ret;
>> +
>> + if (chip->bbt_options & NAND_BBT_USE_FLASH)
>> + chip->bbt_options |= NAND_BBT_NO_OOB;
>> +
>> + chip->ecc.mode = NAND_ECC_HW;
>> + chip->ecc.size = 512;
>> + chip->ecc.steps = mtd->writesize / chip->ecc.size;
>> + if (chip->ecc_step_ds != 512) {
>> + dev_err(dev, "Unsupported step size %d\n", chip-
>> >ecc_step_ds);
>> + return -EINVAL;
>> + }
>> +
>> + chip->ecc.read_page = tegra_nand_read_page_hwecc;
>> + chip->ecc.write_page = tegra_nand_write_page_hwecc;
>> +
>> + config = readl_relaxed(ctrl->regs + CFG);
>> + config |= CFG_PIPE_EN | CFG_SKIP_SPARE |
>> CFG_SKIP_SPARE_SIZE_4;
>> +
>> + if (chip->options & NAND_BUSWIDTH_16)
>> + config |= CFG_BUS_WIDTH_16;
>> +
>> + if (chip->ecc.algo == NAND_ECC_UNKNOWN) {
>> + if (mtd->writesize < 2048)
>> + chip->ecc.algo = NAND_ECC_RS;
>> + else
>> + chip->ecc.algo = NAND_ECC_BCH;
>> + }
>> +
>> + if (chip->ecc.algo == NAND_ECC_BCH && mtd->writesize < 2048)
>> {
>> + dev_err(dev, "BCH supportes 2K or 4K page size
>> only\n");
>> + return -EINVAL;
>> + }
>> +
>> + if (!chip->ecc.strength) {
>> + ret = tegra_nand_select_strength(chip, mtd-
>> >oobsize);
>> + if (ret < 0) {
>> + dev_err(dev, "No valid strenght found,
>> minimum %d\n",
>> + chip->ecc_strength_ds);
>> + return ret;
>> + }
>> +
>> + chip->ecc.strength = ret;
>> + }
>> +
>> + switch (chip->ecc.algo) {
>> + case NAND_ECC_RS:
>> + bits_per_step = BITS_PER_STEP_RS * chip-
>> >ecc.strength;
>> + mtd_set_ooblayout(mtd, &tegra_nand_oob_rs_ops);
>> + switch (chip->ecc.strength) {
>> + case 4:
>> + config |= CFG_ECC_SEL | CFG_TVAL_4;
>> + break;
>> + case 6:
>> + config |= CFG_ECC_SEL | CFG_TVAL_6;
>> + break;
>> + case 8:
>> + config |= CFG_ECC_SEL | CFG_TVAL_8;
>> + break;
>> + default:
>> + dev_err(dev, "ECC strength %d not
>> supported\n",
>> + chip->ecc.strength);
>> + return -EINVAL;
>> + }
>> + break;
>> + case NAND_ECC_BCH:
>> + bits_per_step = BITS_PER_STEP_BCH * chip-
>> >ecc.strength;
>> + mtd_set_ooblayout(mtd, &tegra_nand_oob_bch_ops);
>> + switch (chip->ecc.strength) {
>> + case 4:
>> + bch_config = BCH_TVAL_4;
>> + break;
>> + case 8:
>> + bch_config = BCH_TVAL_8;
>> + break;
>> + case 14:
>> + bch_config = BCH_TVAL_14;
>> + break;
>> + case 16:
>> + bch_config = BCH_TVAL_16;
>> + break;
>> + default:
>> + dev_err(dev, "ECC strength %d not
>> supported\n",
>> + chip->ecc.strength);
>> + return -EINVAL;
>> + }
>> + break;
>> + default:
>> + dev_err(dev, "ECC algorithm not supported\n");
>> + return -EINVAL;
>> + }
>> +
>> + dev_info(dev, "Using %s with strength %d per 512 byte
>> step\n",
>> + chip->ecc.algo == NAND_ECC_BCH ? "BCH" :
>> "RS",
>> + chip->ecc.strength);
>> +
>> + chip->ecc.bytes = DIV_ROUND_UP(bits_per_step,
>> BITS_PER_BYTE);
>> +
>> + switch (mtd->writesize) {
>> + case 256:
>> + config |= CFG_PS_256;
>> + break;
>> + case 512:
>> + config |= CFG_PS_512;
>> + break;
>> + case 1024:
>> + config |= CFG_PS_1024;
>> + break;
>> + case 2048:
>> + config |= CFG_PS_2048;
>> + break;
>> + case 4096:
>> + config |= CFG_PS_4096;
>> + break;
>> + default:
>> + dev_err(dev, "Unsupported writesize %d\n", mtd-
>> >writesize);
>> + return -ENODEV;
>> + }
>> +
>> + writel_relaxed(config, ctrl->regs + CFG);
>> + writel_relaxed(bch_config, ctrl->regs + BCH_CONFIG);
>> +
>> + ret = nand_scan_tail(mtd);
>> + if (ret)
>> + return ret;
>> +
>> + mtd_ooblayout_free(mtd, 0, &nand->tag);
>> +
>> + config |= CFG_TAG_BYTE_SIZE(nand->tag.length - 1);
>> + writel_relaxed(config, ctrl->regs + CFG);
>> +
>> + ret = mtd_device_register(mtd, NULL, 0);
>> + if (ret) {
>> + dev_err(dev, "Failed to register mtd device: %d\n",
>> ret);
>> + nand_cleanup(chip);
>> + return ret;
>> + }
>> +
>> + ctrl->chip = chip;
>> +
>> + return 0;
>> +}
>> +
>> +static int tegra_nand_probe(struct platform_device *pdev)
>> +{
>> + struct reset_control *rst;
>> + struct tegra_nand_controller *ctrl;
>> + struct resource *res;
>> + unsigned long reg;
>> + int irq, err = 0;
>> +
>> + ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
>> + if (!ctrl)
>> + return -ENOMEM;
>> +
>> + ctrl->dev = &pdev->dev;
>> + nand_hw_control_init(&ctrl->controller);
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + ctrl->regs = devm_ioremap_resource(&pdev->dev, res);
>> + if (IS_ERR(ctrl->regs))
>> + return PTR_ERR(ctrl->regs);
>> +
>> + rst = devm_reset_control_get(&pdev->dev, "nand");
>> + if (IS_ERR(rst))
>> + return PTR_ERR(rst);
>> +
>> + ctrl->clk = devm_clk_get(&pdev->dev, "nand");
>> + if (IS_ERR(ctrl->clk))
>> + return PTR_ERR(ctrl->clk);
>> +
>> + err = clk_prepare_enable(ctrl->clk);
>> + if (err)
>> + return err;
>> +
>> + err = reset_control_reset(rst);
>> + if (err)
>> + goto err_disable_clk;
>> +
>> + reg = HWSTATUS_RDSTATUS_MASK(1) | HWSTATUS_RDSTATUS_VALUE(0)
>> |
>> + HWSTATUS_RBSY_MASK(NAND_STATUS_READY) |
>> + HWSTATUS_RBSY_VALUE(NAND_STATUS_READY);
>> + writel_relaxed(NAND_CMD_STATUS, ctrl->regs + HWSTATUS_CMD);
>> + writel_relaxed(reg, ctrl->regs + HWSTATUS_MASK);
>> +
>> + init_completion(&ctrl->command_complete);
>> + init_completion(&ctrl->dma_complete);
>> +
>> + /* clear interrupts */
>> + reg = readl_relaxed(ctrl->regs + ISR);
>> + writel_relaxed(reg, ctrl->regs + ISR);
>> +
>> + irq = platform_get_irq(pdev, 0);
>> + err = devm_request_irq(&pdev->dev, irq, tegra_nand_irq, 0,
>> + dev_name(&pdev->dev), ctrl);
>> + if (err)
>> + goto err_disable_clk;
>> +
>> + writel_relaxed(DMA_CTRL_IS_DONE, ctrl->regs + DMA_CTRL);
>> +
>> + /* enable interrupts */
>> + reg = IER_UND | IER_OVR | IER_CMD_DONE | IER_GIE;
>> + writel_relaxed(reg, ctrl->regs + IER);
>> +
>> + /* reset config */
>> + writel_relaxed(0, ctrl->regs + CFG);
>> +
>> + err = tegra_nand_chips_init(ctrl->dev, ctrl);
>> + if (err)
>> + goto err_disable_clk;
>> +
>> + platform_set_drvdata(pdev, ctrl);
>> +
>> + return 0;
>> +
>> +err_disable_clk:
>> + clk_disable_unprepare(ctrl->clk);
>> + return err;
>> +}
>> +
>> +static int tegra_nand_remove(struct platform_device *pdev)
>> +{
>> + struct tegra_nand_controller *ctrl =
>> platform_get_drvdata(pdev);
>> +
>> + nand_release(nand_to_mtd(ctrl->chip));
>> +
>> + clk_disable_unprepare(ctrl->clk);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id tegra_nand_of_match[] = {
>> + { .compatible = "nvidia,tegra20-nand" },
>> + { /* sentinel */ }
>> +};
>> +
>> +static struct platform_driver tegra_nand_driver = {
>> + .driver = {
>> + .name = "tegra-nand",
>> + .of_match_table = tegra_nand_of_match,
>> + },
>> + .probe = tegra_nand_probe,
>> + .remove = tegra_nand_remove,
>> +};
>> +module_platform_driver(tegra_nand_driver);
>> +
>> +MODULE_DESCRIPTION("NVIDIA Tegra NAND driver");
>> +MODULE_AUTHOR("Thierry Reding <thierry.reding@...dia.com>");
>> +MODULE_AUTHOR("Lucas Stach <dev@...xeye.de>");
>> +MODULE_AUTHOR("Stefan Agner <stefan@...er.ch>");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_DEVICE_TABLE(of, tegra_nand_of_match);
>
> Sorry for any noise/mistake, I'm new to kernel development
That was constructive feedback! Thanks for pointing out!
--
Stefan
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