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 <hpchen0...@gmail.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
