mtd: rawnand: ams-delta: Don't hardcode read/write pulse widths (ccada49b) · Commits · 戴 / test

drivers/mtd/nand/raw/ams-delta.c

+27 −2

Original line number	Diff line number	Diff line
		@@ -40,12 +40,14 @@ struct ams_delta_nand {
		struct gpio_desc *gpiod_cle;
		struct gpio_descs *data_gpiods;
		bool data_in;
		unsigned int tRP;
		unsigned int tWP;
		};

		static void ams_delta_write_commit(struct ams_delta_nand *priv)
		{
		gpiod_set_value(priv->gpiod_nwe, 1);
		ndelay(40);
		ndelay(priv->tWP);
		gpiod_set_value(priv->gpiod_nwe, 0);
		}

		@@ -82,7 +84,7 @@ static u8 ams_delta_io_read(struct ams_delta_nand *priv)
		DECLARE_BITMAP(values, BITS_PER_TYPE(res)) = { 0, };

		gpiod_set_value(priv->gpiod_nre, 1);
		ndelay(40);
		ndelay(priv->tRP);

		gpiod_get_raw_array_value(data_gpiods->ndescs, data_gpiods->desc,
		data_gpiods->info, values);
		@@ -187,8 +189,31 @@ static int ams_delta_exec_op(struct nand_chip *this,
		return ret;
		}

		static int ams_delta_setup_data_interface(struct nand_chip *this, int csline,
		const struct nand_data_interface *cf)
		{
		struct ams_delta_nand *priv = nand_get_controller_data(this);
		const struct nand_sdr_timings *sdr = nand_get_sdr_timings(cf);
		struct device *dev = &nand_to_mtd(this)->dev;

		if (IS_ERR(sdr))
		return PTR_ERR(sdr);

		if (csline == NAND_DATA_IFACE_CHECK_ONLY)
		return 0;

		priv->tRP = DIV_ROUND_UP(sdr->tRP_min, 1000);
		dev_dbg(dev, "using %u ns read pulse width\n", priv->tRP);

		priv->tWP = DIV_ROUND_UP(sdr->tWP_min, 1000);
		dev_dbg(dev, "using %u ns write pulse width\n", priv->tWP);

		return 0;
		}

		static const struct nand_controller_ops ams_delta_ops = {
		.exec_op = ams_delta_exec_op,
		.setup_data_interface = ams_delta_setup_data_interface,
		};

		/*