From 66d00ebdeaa967b56438ac3c7352a377174742d6 Mon Sep 17 00:00:00 2001 From: Michael Walle Date: Thu, 15 Oct 2020 23:08:58 +0200 Subject: board: sl28: add board specific nvm command The board supports 16 configuration bits which can be manipulated with this command. See the board's README for a detailed explanation on each bit. Signed-off-by: Michael Walle Tested-by: Heiko Thiery Reviewed-by: Priyanka Jain --- board/kontron/sl28/cmds.c | 178 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 178 insertions(+) create mode 100644 board/kontron/sl28/cmds.c (limited to 'board/kontron/sl28/cmds.c') diff --git a/board/kontron/sl28/cmds.c b/board/kontron/sl28/cmds.c new file mode 100644 index 0000000000..046d3b4903 --- /dev/null +++ b/board/kontron/sl28/cmds.c @@ -0,0 +1,178 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * sl28 extension commands + * + * Copyright (c) 2020 Kontron Europe GmbH + */ + +#include +#include +#include +#include + +#define CPLD_I2C_ADDR 0x4a +#define REG_UFM_CTRL 0x02 +#define UFM_CTRL_DCLK BIT(1) +#define UFM_CTRL_DIN BIT(2) +#define UFM_CTRL_PROGRAM BIT(3) +#define UFM_CTRL_ERASE BIT(4) +#define UFM_CTRL_DSHIFT BIT(5) +#define UFM_CTRL_DOUT BIT(6) +#define UFM_CTRL_BUSY BIT(7) + +static int ufm_shift_data(struct udevice *dev, u16 data_in, u16 *data_out) +{ + int i; + int ret; + u16 data = 0; + + /* latch data */ + ret = dm_i2c_reg_write(dev, REG_UFM_CTRL, 0); + if (ret < 0) + return ret; + ret = dm_i2c_reg_write(dev, REG_UFM_CTRL, UFM_CTRL_DCLK); + if (ret < 0) + return ret; + + /* assert drshift */ + ret = dm_i2c_reg_write(dev, REG_UFM_CTRL, + UFM_CTRL_DSHIFT | UFM_CTRL_DCLK); + if (ret < 0) + return ret; + + /* clock 16 data bits, reverse order */ + for (i = 15; i >= 0; i--) { + u8 din = (data_in & (1 << i)) ? UFM_CTRL_DIN : 0; + + ret = dm_i2c_reg_write(dev, REG_UFM_CTRL, UFM_CTRL_DSHIFT + | din); + if (ret < 0) + return ret; + if (data_out) { + ret = dm_i2c_reg_read(dev, REG_UFM_CTRL); + if (ret < 0) + return ret; + if (ret & UFM_CTRL_DOUT) + data |= (1 << i); + } + ret = dm_i2c_reg_write(dev, REG_UFM_CTRL, + UFM_CTRL_DSHIFT | UFM_CTRL_DCLK | din); + if (ret < 0) + return ret; + } + + /* deassert drshift */ + ret = dm_i2c_reg_write(dev, REG_UFM_CTRL, UFM_CTRL_DCLK); + if (ret < 0) + return ret; + + if (data_out) + *data_out = data; + + return ret; +} + +static int ufm_erase(struct udevice *dev) +{ + int ret; + + /* erase, tEPMX is 500ms */ + ret = dm_i2c_reg_write(dev, REG_UFM_CTRL, + UFM_CTRL_DCLK | UFM_CTRL_ERASE); + if (ret < 0) + return ret; + ret = dm_i2c_reg_write(dev, REG_UFM_CTRL, UFM_CTRL_DCLK); + if (ret < 0) + return ret; + mdelay(500); + + return 0; +} + +static int ufm_program(struct udevice *dev) +{ + int ret; + + /* program, tPPMX is 100us */ + ret = dm_i2c_reg_write(dev, REG_UFM_CTRL, + UFM_CTRL_DCLK | UFM_CTRL_PROGRAM); + if (ret < 0) + return ret; + ret = dm_i2c_reg_write(dev, REG_UFM_CTRL, UFM_CTRL_DCLK); + if (ret < 0) + return ret; + udelay(100); + + return 0; +} + +static int ufm_write(struct udevice *dev, u16 data) +{ + int ret; + + ret = ufm_shift_data(dev, data, NULL); + if (ret < 0) + return ret; + + ret = ufm_erase(dev); + if (ret < 0) + return ret; + + return ufm_program(dev); +} + +static int ufm_read(struct udevice *dev, u16 *data) +{ + return ufm_shift_data(dev, 0, data); +} + +static int do_sl28_nvm(struct cmd_tbl *cmdtp, int flag, int argc, + char *const argv[]) +{ + struct udevice *dev; + u16 nvm; + int ret; + char *endp; + + if (i2c_get_chip_for_busnum(0, CPLD_I2C_ADDR, 1, &dev)) + return CMD_RET_FAILURE; + + if (argc > 1) { + nvm = simple_strtoul(argv[1], &endp, 16); + if (*endp != '\0') { + printf("ERROR: argument is not a valid number\n"); + ret = -EINVAL; + goto out; + } + + /* + * We swap all bits, because the a zero bit in hardware means the + * feature is enabled. But this is hard for the user. + */ + nvm ^= 0xffff; + + ret = ufm_write(dev, nvm); + if (ret) + goto out; + printf("New settings will be activated after the next power cycle!\n"); + } else { + ret = ufm_read(dev, &nvm); + if (ret) + goto out; + nvm ^= 0xffff; + + printf("%04hx\n", nvm); + } + + return CMD_RET_SUCCESS; + +out: + printf("command failed (%d)\n", ret); + return CMD_RET_FAILURE; +} + +static char sl28_help_text[] = + "nvm [] - display/set the 16 non-volatile bits\n"; + +U_BOOT_CMD_WITH_SUBCMDS(sl28, "SMARC-sAL28 specific", sl28_help_text, + U_BOOT_SUBCMD_MKENT(nvm, 2, 1, do_sl28_nvm)); -- cgit