imx: load calibration parameters from fuse for i.MX8MP

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>

diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index a1d9470f3d9291a79a96fb4e6db7c2f08c743ca6..ea0430c207f78f0b231396bc8c1f3f14eea9af8a 100644 (file)
--- a/arch/arm/mach-imx/imx8m/soc.c
+++ b/arch/arm/mach-imx/imx8m/soc.c
@@ -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
 }