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Date: Mon, 29 May 2017 11:15:36 +0200
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc: linux-mtd@...ts.infradead.org, andrew@...n.ch,
computersforpeace@...il.com, dwmw2@...radead.org,
linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
Richard Weinberger <richard@....at>,
Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 5/5] mtd: mchp23k256: Add support for mchp23lcv1024
On Thu, 25 May 2017 11:49:16 +1200
Chris Packham <chris.packham@...iedtelesis.co.nz> wrote:
> The mchp23lcv1024 is similar to the mchp23k256, the differences (from a
> software point of view) are the capacity of the chip and the size of the
> addresses used.
>
> There is no way to detect the specific chip so we must be told via a
> Device Tree or default to mchp23k256 when device tree is not used.
>
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
> Changes in v2:
> - fix formatting in switch statement
> - add support for 24-bit addressing
> Changes in v3:
> - None
> Changes in v4:
> - reword commit message (thanks Andrew)
> - introduce mchp23_caps struct (thanks Boris)
>
> .../bindings/mtd/microchip,mchp23k256.txt | 2 +-
> drivers/mtd/devices/mchp23k256.c | 66 ++++++++++++++++++----
> 2 files changed, 57 insertions(+), 11 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mtd/microchip,mchp23k256.txt b/Documentation/devicetree/bindings/mtd/microchip,mchp23k256.txt
> index 25e5ad38b0f0..7328eb92a03c 100644
> --- a/Documentation/devicetree/bindings/mtd/microchip,mchp23k256.txt
> +++ b/Documentation/devicetree/bindings/mtd/microchip,mchp23k256.txt
> @@ -3,7 +3,7 @@
> Required properties:
> - #address-cells, #size-cells : Must be present if the device has sub-nodes
> representing partitions.
> -- compatible : Must be "microchip,mchp23k256"
> +- compatible : Must be one of "microchip,mchp23k256" or "microchip,mchp23lcv1024"
> - reg : Chip-Select number
> - spi-max-frequency : Maximum frequency of the SPI bus the chip can operate at
>
> diff --git a/drivers/mtd/devices/mchp23k256.c b/drivers/mtd/devices/mchp23k256.c
> index 3e5feb454644..8956b7dcc984 100644
> --- a/drivers/mtd/devices/mchp23k256.c
> +++ b/drivers/mtd/devices/mchp23k256.c
> @@ -21,10 +21,18 @@
> #include <linux/spi/spi.h>
> #include <linux/of_device.h>
>
> +#define MAX_CMD_SIZE 4
> +
> +struct mchp23_caps {
> + u8 addr_width;
> + unsigned int size;
> +};
> +
> struct mchp23k256_flash {
> struct spi_device *spi;
> struct mutex lock;
> struct mtd_info mtd;
> + const struct mchp23_caps *caps;
> };
>
> #define MCHP23K256_CMD_WRITE_STATUS 0x01
> @@ -34,22 +42,40 @@ struct mchp23k256_flash {
>
> #define to_mchp23k256_flash(x) container_of(x, struct mchp23k256_flash, mtd)
>
> +static void mchp23k256_addr2cmd(struct mchp23k256_flash *flash,
> + unsigned int addr, u8 *cmd)
> +{
> + int i;
> +
> + /*
> + * Address is sent in big endian (MSB first) and we skip
> + * the first entry of the cmd array which contains the cmd
> + * opcode.
> + */
> + for (i = flash->caps->addr_width; i > 0; i--, addr >>= 8)
> + cmd[i] = addr;
> +}
> +
> +static int mchp23k256_cmdsz(struct mchp23k256_flash *flash)
> +{
> + return 1 + flash->caps->addr_width;
> +}
> +
> static int mchp23k256_write(struct mtd_info *mtd, loff_t to, size_t len,
> size_t *retlen, const unsigned char *buf)
> {
> struct mchp23k256_flash *flash = to_mchp23k256_flash(mtd);
> struct spi_transfer transfer[2] = {};
> struct spi_message message;
> - unsigned char command[3];
> + unsigned char command[MAX_CMD_SIZE];
>
> spi_message_init(&message);
>
> command[0] = MCHP23K256_CMD_WRITE;
> - command[1] = to >> 8;
> - command[2] = to;
> + mchp23k256_addr2cmd(flash, to, command);
>
> transfer[0].tx_buf = command;
> - transfer[0].len = sizeof(command);
> + transfer[0].len = mchp23k256_cmdsz(flash);
> spi_message_add_tail(&transfer[0], &message);
>
> transfer[1].tx_buf = buf;
> @@ -73,17 +99,16 @@ static int mchp23k256_read(struct mtd_info *mtd, loff_t from, size_t len,
> struct mchp23k256_flash *flash = to_mchp23k256_flash(mtd);
> struct spi_transfer transfer[2] = {};
> struct spi_message message;
> - unsigned char command[3];
> + unsigned char command[MAX_CMD_SIZE];
>
> spi_message_init(&message);
>
> memset(&transfer, 0, sizeof(transfer));
> command[0] = MCHP23K256_CMD_READ;
> - command[1] = from >> 8;
> - command[2] = from;
> + mchp23k256_addr2cmd(flash, from, command);
>
> transfer[0].tx_buf = command;
> - transfer[0].len = sizeof(command);
> + transfer[0].len = mchp23k256_cmdsz(flash);
> spi_message_add_tail(&transfer[0], &message);
>
> transfer[1].rx_buf = buf;
> @@ -123,6 +148,16 @@ static int mchp23k256_set_mode(struct spi_device *spi)
> return spi_sync(spi, &message);
> }
>
> +static const struct mchp23_caps mchp23k256_caps = {
> + .size = SZ_32K,
> + .addr_width = 2,
> +};
> +
> +static const struct mchp23_caps mchp23lcv1024_caps = {
> + .size = SZ_128K,
> + .addr_width = 3,
> +};
> +
> static int mchp23k256_probe(struct spi_device *spi)
> {
> struct mchp23k256_flash *flash;
> @@ -143,12 +178,16 @@ static int mchp23k256_probe(struct spi_device *spi)
>
> data = dev_get_platdata(&spi->dev);
>
> + flash->caps = of_device_get_match_data(&spi->dev);
> + if (!flash->caps)
> + flash->caps = &mchp23k256_caps;
> +
> mtd_set_of_node(&flash->mtd, spi->dev.of_node);
> flash->mtd.dev.parent = &spi->dev;
> flash->mtd.type = MTD_RAM;
> flash->mtd.flags = MTD_CAP_RAM;
> flash->mtd.writesize = 1;
> - flash->mtd.size = SZ_32K;
> + flash->mtd.size = flash->caps->size;
> flash->mtd._read = mchp23k256_read;
> flash->mtd._write = mchp23k256_write;
>
> @@ -168,7 +207,14 @@ static int mchp23k256_remove(struct spi_device *spi)
> }
>
> static const struct of_device_id mchp23k256_of_table[] = {
> - { .compatible = "microchip,mchp23k256" },
> + {
> + .compatible = "microchip,mchp23k256",
> + .data = &mchp23k256_caps,
> + },
> + {
> + .compatible = "microchip,mchp23lcv1024",
> + .data = &mchp23lcv1024_caps,
> + },
> {}
> };
> MODULE_DEVICE_TABLE(of, mchp23k256_of_table);
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