Hi,
Just a warning as I had the same issue with 8729b1ae2cbd ("misc: Update read()
and write() methods to return bytes xfered")
> From: U-Boot <[email protected]> On Behalf Of Pragnesh Patel
> Sent: lundi 24 février 2020 09:33
>
> Use the OTP DM driver to set the serial environment variable.
>
> Signed-off-by: Pragnesh Patel <[email protected]>
> ---
> arch/riscv/dts/fu540-c000-u-boot.dtsi | 14 +++
> .../dts/hifive-unleashed-a00-u-boot.dtsi | 6 +
> board/sifive/fu540/Kconfig | 2 +
> board/sifive/fu540/fu540.c | 113 +++++++-----------
> 4 files changed, 62 insertions(+), 73 deletions(-) create mode 100644
> arch/riscv/dts/fu540-c000-u-boot.dtsi
> create mode 100644 arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi
>
> diff --git a/arch/riscv/dts/fu540-c000-u-boot.dtsi
> b/arch/riscv/dts/fu540-c000-u-
> boot.dtsi
> new file mode 100644
> index 0000000000..31fd113c7d
> --- /dev/null
> +++ b/arch/riscv/dts/fu540-c000-u-boot.dtsi
> @@ -0,0 +1,14 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * (C) Copyright 2019 SiFive, Inc
> + */
> +
> +/ {
> + soc {
> + otp: otp@10070000 {
> + compatible = "sifive,fu540-otp";
> + reg = <0x0 0x10070000 0x0 0x0FFF>;
> + fuse-count = <0x1000>;
> + };
> + };
> +};
> diff --git a/arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi
> b/arch/riscv/dts/hifive-
> unleashed-a00-u-boot.dtsi
> new file mode 100644
> index 0000000000..bec0d19134
> --- /dev/null
> +++ b/arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi
> @@ -0,0 +1,6 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2019 SiFive, Inc
> + */
> +
> +#include "fu540-c000-u-boot.dtsi"
> diff --git a/board/sifive/fu540/Kconfig b/board/sifive/fu540/Kconfig index
> 5ca21474de..900197bbb2 100644
> --- a/board/sifive/fu540/Kconfig
> +++ b/board/sifive/fu540/Kconfig
> @@ -48,5 +48,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
> imply SIFIVE_GPIO
> imply CMD_GPIO
> imply SMP
> + imply MISC
> + imply SIFIVE_OTP
>
> endif
> diff --git a/board/sifive/fu540/fu540.c b/board/sifive/fu540/fu540.c index
> 47a2090251..409471effc 100644
> --- a/board/sifive/fu540/fu540.c
> +++ b/board/sifive/fu540/fu540.c
> @@ -10,94 +10,61 @@
> #include <dm.h>
> #include <linux/delay.h>
> #include <linux/io.h>
> +#include <misc.h>
>
> -#ifdef CONFIG_MISC_INIT_R
> -
> -#define FU540_OTP_BASE_ADDR 0x10070000
> -
> -struct fu540_otp_regs {
> - u32 pa; /* Address input */
> - u32 paio; /* Program address input */
> - u32 pas; /* Program redundancy cell selection input */
> - u32 pce; /* OTP Macro enable input */
> - u32 pclk; /* Clock input */
> - u32 pdin; /* Write data input */
> - u32 pdout; /* Read data output */
> - u32 pdstb; /* Deep standby mode enable input (active low) */
> - u32 pprog; /* Program mode enable input */
> - u32 ptc; /* Test column enable input */
> - u32 ptm; /* Test mode enable input */
> - u32 ptm_rep;/* Repair function test mode enable input */
> - u32 ptr; /* Test row enable input */
> - u32 ptrim; /* Repair function enable input */
> - u32 pwe; /* Write enable input (defines program cycle) */
> -} __packed;
> -
> -#define BYTES_PER_FUSE 4
> -#define NUM_FUSES 0x1000
> -
> -static int fu540_otp_read(int offset, void *buf, int size) -{
> - struct fu540_otp_regs *regs = (void __iomem
> *)FU540_OTP_BASE_ADDR;
> - unsigned int i;
> - int fuseidx = offset / BYTES_PER_FUSE;
> - int fusecount = size / BYTES_PER_FUSE;
> - u32 fusebuf[fusecount];
> -
> - /* check bounds */
> - if (offset < 0 || size < 0)
> - return -EINVAL;
> - if (fuseidx >= NUM_FUSES)
> - return -EINVAL;
> - if ((fuseidx + fusecount) > NUM_FUSES)
> - return -EINVAL;
> -
> - /* init OTP */
> - writel(0x01, ®s->pdstb); /* wake up from stand-by */
> - writel(0x01, ®s->ptrim); /* enable repair function */
> - writel(0x01, ®s->pce); /* enable input */
> -
> - /* read all requested fuses */
> - for (i = 0; i < fusecount; i++, fuseidx++) {
> - writel(fuseidx, ®s->pa);
> -
> - /* cycle clock to read */
> - writel(0x01, ®s->pclk);
> - mdelay(1);
> - writel(0x00, ®s->pclk);
> - mdelay(1);
> -
> - /* read the value */
> - fusebuf[i] = readl(®s->pdout);
> - }
> -
> - /* shut down */
> - writel(0, ®s->pce);
> - writel(0, ®s->ptrim);
> - writel(0, ®s->pdstb);
> -
> - /* copy out */
> - memcpy(buf, fusebuf, size);
> +/*
> + * This define is a value used for error/unknown serial.
> + * If we really care about distinguishing errors and 0 is
> + * valid, we'll need a different one.
> + */
> +#define ERROR_READING_SERIAL_NUMBER 0
>
> - return 0;
> -}
> +#ifdef CONFIG_MISC_INIT_R
>
> -static u32 fu540_read_serialnum(void)
> +#if CONFIG_IS_ENABLED(SIFIVE_OTP)
> +static u32 otp_read_serialnum(struct udevice *dev)
> {
> int ret;
> u32 serial[2] = {0};
>
> for (int i = 0xfe * 4; i > 0; i -= 8) {
> - ret = fu540_otp_read(i, serial, sizeof(serial));
> + ret = misc_read(dev, i, serial, sizeof(serial));
> +
> if (ret) {
Warning here, misc_read returns now the size of the data (sizeof(serial)),
since commit 8729b1ae2cbd ("misc: Update read() and write() methods to return
bytes xfered")
So I think the test need to change to
if (ret < 0)
or
if (ret != sizeof(serial))
> - printf("%s: error reading from OTP\n", __func__);
> + printf("%s: error reading serial from OTP\n", __func__);
> break;
> }
> +
> if (serial[0] == ~serial[1])
> return serial[0];
> }
>
> - return 0;
> + return ERROR_READING_SERIAL_NUMBER;
> +}
> +#endif
> +
> +static u32 fu540_read_serialnum(void)
> +{
> + u32 serial = ERROR_READING_SERIAL_NUMBER;
> +
> +#if CONFIG_IS_ENABLED(SIFIVE_OTP)
> + struct udevice *dev;
> + int ret;
> +
> + // init OTP
> + ret = uclass_get_device_by_driver(UCLASS_MISC,
> + DM_GET_DRIVER(sifive_otp), &dev);
> +
> + if (ret) {
> + debug("%s: could not find otp device\n", __func__);
> + return serial;
> + }
> +
> + // read serial from OTP and set env var
> + serial = otp_read_serialnum(dev);
> +#endif
> +
> + return serial;
> }
>
> static void fu540_setup_macaddr(u32 serialnum)
> --
> 2.17.1
Patrick
