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riscv: sifive: fu540: Use OTP DM driver for serial environment variable

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Use the OTP DM driver to set the serial environment variable.

Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Pragnesh Patel 2020-05-29 11:33:22 +05:30 committed by Andes
parent 05307213c6
commit 88eec6159a
4 changed files with 60 additions and 75 deletions
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14
arch/riscv/dts/fu540-c000-u-boot.dtsi Normal file
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@ -0,0 +1,14 @@
// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/*
* (C) Copyright 2019 SiFive, Inc
*/
/ {
soc {
otp: otp@10070000 {
compatible = "sifive,fu540-c000-otp";
reg = <0x0 0x10070000 0x0 0x0FFF>;
fuse-count = <0x1000>;
};
};
};

2
arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi
View file

@ -3,6 +3,8 @@
* Copyright (C) 2019 Jagan Teki <jagan@amarulasolutions.com>
*/
#include "fu540-c000-u-boot.dtsi"
/ {
aliases {
spi0 = &qspi0;

2
board/sifive/fu540/Kconfig
View file

@ -51,5 +51,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
imply SIFIVE_GPIO
imply CMD_GPIO
imply SMP
imply MISC
imply SIFIVE_OTP
endif

117
board/sifive/fu540/fu540.c
View file

@ -6,101 +6,68 @@
* Anup Patel <anup.patel@wdc.com>
*/
#include <common.h>
#include <dm.h>
#include <env.h>
#include <init.h>
#include <log.h>
#include <linux/bug.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <misc.h>
/*
* 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
#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, &regs->pdstb); /* wake up from stand-by */
writel(0x01, &regs->ptrim); /* enable repair function */
writel(0x01, &regs->pce); /* enable input */
/* read all requested fuses */
for (i = 0; i < fusecount; i++, fuseidx++) {
writel(fuseidx, &regs->pa);
/* cycle clock to read */
writel(0x01, &regs->pclk);
mdelay(1);
writel(0x00, &regs->pclk);
mdelay(1);
/* read the value */
fusebuf[i] = readl(&regs->pdout);
}
/* shut down */
writel(0, &regs->pce);
writel(0, &regs->ptrim);
writel(0, &regs->pdstb);
/* copy out */
memcpy(buf, fusebuf, size);
return 0;
}
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));
if (ret) {
printf("%s: error reading from OTP\n", __func__);
ret = misc_read(dev, i, serial, sizeof(serial));
if (ret != sizeof(serial)) {
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)