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imx: load calibration parameters from fuse for i.MX8MP

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i.MX8MP thermal which has two probes and supports temperature range
from -40 to 125.  The driver still uses default 1p HW
calibration at 25C and loads calibration parameters from fuse.

Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Ye Li 2020-05-03 22:19:54 +08:00 • committed by Stefano Babic
parent 94c693d782
commit ebb9aab318
1 changed files with 45 additions and 0 deletions
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45
arch/arm/mach-imx/imx8m/soc.c
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@ -473,4 +473,49 @@ void imx_tmu_arch_init(void *reg_base)
writel((tca_en << 31) | (tca_hr << 16) | tca_rt,
(ulong)reg_base + 0x30);
}
#ifdef CONFIG_IMX8MP
/* Load TCALIV0/1/m40 and TRIM from fuses */
struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
struct fuse_bank *bank = &ocotp->bank[38];
struct fuse_bank38_regs *fuse =
(struct fuse_bank38_regs *)bank->fuse_regs;
struct fuse_bank *bank2 = &ocotp->bank[39];
struct fuse_bank39_regs *fuse2 =
(struct fuse_bank39_regs *)bank2->fuse_regs;
u32 buf_vref, buf_slope, bjt_cur, vlsb, bgr;
u32 reg;
u32 tca40[2], tca25[2], tca105[2];
/* For blank sample */
if (!fuse->ana_trim2 && !fuse->ana_trim3 &&
!fuse->ana_trim4 && !fuse2->ana_trim5) {
/* Use a default 25C binary codes */
tca25[0] = 1596;
writel(tca25[0], (ulong)reg_base + 0x30);
return;
}
buf_vref = (fuse->ana_trim2 & 0xc0) >> 6;
buf_slope = (fuse->ana_trim2 & 0xF00) >> 8;
bjt_cur = (fuse->ana_trim2 & 0xF000) >> 12;
bgr = (fuse->ana_trim2 & 0xF0000) >> 16;
vlsb = (fuse->ana_trim2 & 0xF00000) >> 20;
writel(buf_vref | (buf_slope << 16), (ulong)reg_base + 0x28);
reg = (bgr << 28) | (bjt_cur << 20) | (vlsb << 12) | (1 << 7);
writel(reg, (ulong)reg_base + 0x3c);
tca40[0] = (fuse->ana_trim3 & 0xFFF0000) >> 16;
tca25[0] = (fuse->ana_trim3 & 0xF0000000) >> 28;
tca25[0] |= ((fuse->ana_trim4 & 0xFF) << 4);
tca105[0] = (fuse->ana_trim4 & 0xFFF00) >> 8;
tca40[1] = (fuse->ana_trim4 & 0xFFF00000) >> 20;
tca25[1] = fuse2->ana_trim5 & 0xFFF;
tca105[1] = (fuse2->ana_trim5 & 0xFFF000) >> 12;
/* use 25c for 1p calibration */
writel(tca25[0] | (tca105[0] << 16), (ulong)reg_base + 0x30);
writel(tca25[1] | (tca105[1] << 16), (ulong)reg_base + 0x34);
writel(tca40[0] | (tca40[1] << 16), (ulong)reg_base + 0x38);
#endif
}