[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <fe56d8be-9c75-48d5-bc2c-76a79e5d7843@gmail.com>
Date: Tue, 20 Aug 2024 13:35:26 +0800
From: Hui-Ping Chen <hpchen0nvt@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
sumit.semwal@...aro.org, christian.koenig@....com, esben@...nix.com,
linux-arm-kernel@...ts.infradead.org, linux-mtd@...ts.infradead.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v2 2/2] mtd: rawnand: nuvoton: add new driver for the
Nuvoton MA35 SoC
Dear Krzysztof,
Thank you for your reply.
On 2024/8/19 下午 07:19, Krzysztof Kozlowski wrote:
> On Mon, Aug 19, 2024 at 09:20:37AM +0000, Hui-Ping Chen wrote:
>> Nuvoton MA35 SoCs NAND Flash Interface Controller
>> supports 2KB, 4KB and 8KB page size, and up to 8-bit,
>> 12-bit, and 24-bit hardware ECC calculation circuit
>> to protect data communication.
>>
>> Signed-off-by: Hui-Ping Chen <hpchen0nvt@...il.com>
> ...
>
>> +static int ma35_nand_probe(struct platform_device *pdev)
>> +{
>> + struct ma35_nand_info *nand;
>> + struct nand_chip *chip;
>> + struct mtd_info *mtd;
>> + int retval = 0;
>> +
>> + nand = devm_kzalloc(&pdev->dev, sizeof(*nand), GFP_KERNEL);
>> + if (!nand)
>> + return -ENOMEM;
>> +
>> + nand_controller_init(&nand->controller);
>> +
>> + nand->regs = devm_platform_ioremap_resource(pdev, 0);
>> + if (IS_ERR(nand->regs))
>> + return PTR_ERR(nand->regs);
>> +
>> + nand->dev = &pdev->dev;
>> + chip = &nand->chip;
>> + mtd = nand_to_mtd(chip);
>> + nand_set_controller_data(chip, nand);
>> + nand_set_flash_node(chip, pdev->dev.of_node);
>> +
>> + mtd->priv = chip;
>> + mtd->owner = THIS_MODULE;
>> + mtd->dev.parent = &pdev->dev;
>> +
>> + nand->clk = devm_clk_get(&pdev->dev, "nand_gate");
>> + if (IS_ERR(nand->clk))
>> + return dev_err_probe(&pdev->dev, PTR_ERR(nand->clk),
>> + "failed to find nand clock\n");
>> +
>> + retval = clk_prepare_enable(nand->clk);
>> + if (retval < 0) {
>> + dev_err(&pdev->dev, "failed to enable clock\n");
>> + retval = -ENXIO;
>> + }
>> +
>> + nand->chip.controller = &nand->controller;
>> +
>> + chip->legacy.cmdfunc = ma35_nand_command;
>> + chip->legacy.waitfunc = ma35_waitfunc;
>> + chip->legacy.read_byte = ma35_nand_read_byte;
>> + chip->legacy.select_chip = ma35_nand_select_chip;
>> + chip->legacy.read_buf = ma35_read_buf_dma;
>> + chip->legacy.write_buf = ma35_write_buf_dma;
>> + chip->legacy.dev_ready = ma35_nand_devready;
>> + chip->legacy.chip_delay = 25; /* us */
>> +
>> + /* Read OOB data first, then HW read page */
>> + chip->ecc.hwctl = ma35_nand_enable_hwecc;
>> + chip->ecc.calculate = ma35_nand_calculate_ecc;
>> + chip->ecc.correct = ma35_nand_correct_data;
>> + chip->ecc.write_page = ma35_nand_write_page_hwecc;
>> + chip->ecc.read_page = ma35_nand_read_page_hwecc_oob_first;
>> + chip->ecc.read_oob = ma35_nand_read_oob_hwecc;
>> + chip->options |= (NAND_NO_SUBPAGE_WRITE | NAND_USES_DMA);
>> +
>> + ma35_nand_initialize(nand);
>> + platform_set_drvdata(pdev, nand);
>> +
>> + nand->controller.ops = &ma35_nand_controller_ops;
>> +
>> + nand->irq = platform_get_irq(pdev, 0);
>> + if (nand->irq < 0)
>> + return dev_err_probe(&pdev->dev, nand->irq,
>> + "failed to get platform irq\n");
>> +
>> + if (request_irq(nand->irq, ma35_nand_irq, IRQF_TRIGGER_HIGH, "ma35d1-nand", nand)) {
>> + dev_err(&pdev->dev, "Error requesting NAND IRQ\n");
>> + return -ENXIO;
>> + }
>> +
>> + retval = nand_scan(chip, 1);
>> + if (retval)
>> + return retval;
>> +
>> + if (mtd_device_register(mtd, nand->parts, nand->nr_parts)) {
>> + nand_cleanup(chip);
>> + devm_kfree(&pdev->dev, nand);
>> + return retval;
>> + }
>> +
>> + return retval;
>> +}
>> +
>> +static void ma35_nand_remove(struct platform_device *pdev)
>> +{
>> + struct ma35_nand_info *nand = platform_get_drvdata(pdev);
>> + struct nand_chip *chip = &nand->chip;
>> + int ret;
>> +
> Where do you release IRQ handler?
I will add a release IRQ handler to this function.
>> + ret = mtd_device_unregister(nand_to_mtd(chip));
>> + WARN_ON(ret);
>> + nand_cleanup(chip);
>> +
>> + clk_disable_unprepare(nand->clk);
>> +
>> + kfree(nand);
> NAK, you never tested your code.
I will strengthen the testing of this function.
>> + platform_set_drvdata(pdev, NULL);
> Why? Drop.
I will remove it.
>> +}
>> +
>> +/* PM Support */
>> +#ifdef CONFIG_PM
>> +static int ma35_nand_suspend(struct platform_device *pdev, pm_message_t pm)
>> +{
>> + struct ma35_nand_info *nand = platform_get_drvdata(pdev);
>> + unsigned long timeo = jiffies + HZ/2;
>> +
>> + /* wait DMAC to ready */
>> + while (1) {
>> + if ((readl(nand->regs + MA35_NFI_REG_DMACTL) & DMA_BUSY) == 0)
>> + break;
>> + if (time_after(jiffies, timeo))
>> + return -ETIMEDOUT;
>> + }
>> +
>> + clk_disable(nand->clk);
>> +
>> + return 0;
>> +}
>> +
>> +static int ma35_nand_resume(struct platform_device *pdev)
>> +{
>> + struct ma35_nand_info *nand = platform_get_drvdata(pdev);
>> +
>> + clk_enable(nand->clk);
>> + ma35_nand_hwecc_init(nand);
>> + ma35_nand_dmac_init(nand);
>> +
>> + return 0;
>> +}
>> +
>> +#else
>> +#define ma35_nand_suspend NULL
>> +#define ma35_nand_resume NULL
>> +#endif
>> +
>> +static const struct of_device_id ma35_nfi_of_match[] = {
>> + { .compatible = "nuvoton,ma35d1-nand" },
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, ma35_nfi_of_match);
>> +
>> +static struct platform_driver ma35_nand_driver = {
>> + .driver = {
> Messed indentation.
I will fix it.
>> + .name = "ma35d1-nand",
>> + .owner = THIS_MODULE,
> Drop. Please do not upstream some 10 year old code... Use recent code as
> template, not 10yo stuff...
I will refer to the new driver implementation.
> Best regards,
> Krzysztof
Best regards,
Hui-Ping Chen
Powered by blists - more mailing lists