| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2020 MediaTek Inc. |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/mfd/mt6359/registers.h> |
| #include <linux/mfd/mt6330/registers.h> |
| #include <linux/mfd/mt6397/core.h> |
| #include <linux/module.h> |
| #include <linux/mutex.h> |
| #include <linux/nvmem-provider.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/platform_device.h> |
| #include <linux/regmap.h> |
| |
| /* PMIC EFUSE registers definition */ |
| #define RG_OTP_PA 0 |
| #define RG_OTP_PDIN 1 |
| #define RG_OTP_PTM 2 |
| #define RG_OTP_PWE 3 |
| #define RG_OTP_PPROG 4 |
| #define RG_OTP_PWE_SRC 5 |
| #define RG_OTP_PROG_PKEY 6 |
| #define RG_OTP_RD_PKEY 7 |
| #define RG_OTP_RD_TRIG 8 |
| #define RG_RD_RDY_BYPASS 9 |
| #define RG_SKIP_OTP_OUT 10 |
| #define RG_OTP_RD_SW 11 |
| #define RG_OTP_DOUT_SW 12 |
| #define RG_OTP_RD_BUSY 13 |
| #define RG_OTP_PA_SW 14 |
| #define RG_OTP_OSC_CK_EN_SW 15 |
| |
| |
| /* Mask definition for EFUSE control engine clock register */ |
| #define RG_EFUSE_CK_PDN_HWEN_MASK BIT(2) |
| #define RG_EFUSE_CK_PDN_MASK BIT(4) |
| #define RG_OTP_RD_BUSY_MASK BIT(0) |
| #define RG_OTP_OSC_CK_EN_SW_MASK BIT(0) |
| #define RG_OTP_OSC_CK_EN_SW_SEL_MASK BIT(1) |
| |
| |
| /* Register SET/CLR offset */ |
| #define SET_OFFSET 0x2 |
| #define CLR_OFFSET 0x4 |
| |
| /* EFUSE Register width (bytes) definitions */ |
| #define EFUSE_REG_WIDTH 2 |
| |
| /* Timeout (us) of polling the status */ |
| #define EFUSE_POLL_TIMEOUT 30000 |
| #define EFUSE_POLL_DELAY_US 50 |
| #define EFUSE_READ_DELAY_US 80 |
| |
| /* efuse attribute for chip dependent charasterictic*/ |
| #define EFUSE_ATTR_BASIC 0x0 |
| #define EFUSE_ATTR_OSC_CK 0x1 |
| #define EFUSE_ATTR_SPMI_8BIT 0x2 |
| |
| struct efuse_chip_data { |
| unsigned int reg_num; |
| unsigned int base; |
| unsigned int ck_pdn; |
| unsigned int ck_pdn_hwen; |
| const unsigned int *regtbl; |
| unsigned int attr; |
| }; |
| |
| struct mt6359_efuse { |
| struct device *dev; |
| struct regmap *regmap; |
| struct mutex lock; |
| unsigned int base; |
| const struct efuse_chip_data *data; |
| int trig_sta; |
| }; |
| |
| static const unsigned int mt6330_efuse_regs_tbl[] = { |
| 0x0, |
| 0x1, |
| 0x2, |
| 0x3, |
| 0x4, |
| 0x5, |
| 0x6, |
| 0x8, |
| 0xa, |
| 0xb, |
| 0xc, |
| 0xd, |
| 0xe, |
| 0x10, |
| 0x11, |
| -1 |
| }; |
| |
| static const unsigned int mt6359_efuse_regs_tbl[] = { |
| 0x0, |
| 0x2, |
| 0x4, |
| 0x6, |
| 0x8, |
| 0xA, |
| 0xC, |
| 0xE, |
| 0x10, |
| 0x12, |
| 0x14, |
| 0x16, |
| 0x18, |
| 0x1A, |
| 0x1C |
| }; |
| |
| static int mt6359_efuse_poll_busy(struct mt6359_efuse *efuse) |
| { |
| int ret; |
| unsigned int val = 0; |
| |
| udelay(EFUSE_POLL_DELAY_US); |
| ret = regmap_read_poll_timeout(efuse->regmap, |
| efuse->data->base + efuse->data->regtbl[RG_OTP_RD_BUSY], |
| val, |
| !(val & RG_OTP_RD_BUSY_MASK), |
| EFUSE_POLL_DELAY_US, |
| EFUSE_POLL_TIMEOUT); |
| if (ret) { |
| dev_err(efuse->dev, "timeout to update the efuse status\n"); |
| return ret; |
| } |
| return 0; |
| } |
| |
| static int mt6359_efuse_read(void *context, unsigned int offset, |
| void *_val, size_t bytes) |
| { |
| struct mt6359_efuse *efuse = context; |
| unsigned int base = efuse->data->base; |
| unsigned int buf = 0; |
| unsigned int offset_end = offset + bytes; |
| unsigned short *val = _val; |
| unsigned int clroffset = CLR_OFFSET, setoffset = SET_OFFSET; |
| int ret; |
| |
| if(efuse->data->attr & EFUSE_ATTR_SPMI_8BIT){ |
| clroffset >>= 1; |
| setoffset >>= 1; |
| } |
| mutex_lock(&efuse->lock); |
| /* Enable the efuse ctrl engine clock */ |
| ret = regmap_write(efuse->regmap, |
| efuse->data->ck_pdn_hwen + clroffset, |
| RG_EFUSE_CK_PDN_HWEN_MASK); |
| if (ret) |
| goto unlock_efuse; |
| ret = regmap_write(efuse->regmap, |
| efuse->data->ck_pdn + clroffset, |
| RG_EFUSE_CK_PDN_MASK); |
| if (ret) |
| goto disable_efuse; |
| |
| if(efuse->data->attr & EFUSE_ATTR_OSC_CK){ |
| regmap_update_bits(efuse->regmap, base + efuse->data->regtbl[RG_OTP_OSC_CK_EN_SW], |
| RG_OTP_OSC_CK_EN_SW_SEL_MASK, RG_OTP_OSC_CK_EN_SW_SEL_MASK); |
| regmap_update_bits(efuse->regmap, base + efuse->data->regtbl[RG_OTP_OSC_CK_EN_SW], |
| RG_OTP_OSC_CK_EN_SW_MASK, RG_OTP_OSC_CK_EN_SW_MASK); |
| } |
| |
| /* Set SW trigger read */ |
| ret = regmap_write(efuse->regmap, base + efuse->data->regtbl[RG_OTP_RD_SW], 1); |
| if (ret) |
| goto disable_efuse; |
| for (; offset < offset_end; offset += EFUSE_REG_WIDTH) { |
| /* Set the row to be read, one row is 2 bytes data */ |
| ret = regmap_write(efuse->regmap, base + efuse->data->regtbl[RG_OTP_PA], offset); |
| if (ret) |
| goto disable_efuse; |
| /* Start trigger read */ |
| efuse->trig_sta = efuse->trig_sta ? 0 : 1; |
| ret = regmap_write(efuse->regmap, base + efuse->data->regtbl[RG_OTP_RD_TRIG], |
| efuse->trig_sta); |
| if (ret) { |
| efuse->trig_sta = efuse->trig_sta ? 0 : 1; |
| goto disable_efuse; |
| } |
| |
| /* |
| * Polling the busy status to make sure the reading process |
| * is completed, that means the data can be read out now. |
| */ |
| ret = mt6359_efuse_poll_busy(efuse); |
| if (ret) |
| goto disable_efuse; |
| |
| /* Read data from efuse memory, must delay before read */ |
| udelay(EFUSE_READ_DELAY_US); |
| if(efuse->data->attr & EFUSE_ATTR_SPMI_8BIT) |
| ret = regmap_bulk_read(efuse->regmap, base + efuse->data->regtbl[RG_OTP_DOUT_SW], |
| &buf, 2); |
| else |
| ret = regmap_read(efuse->regmap, base + efuse->data->regtbl[RG_OTP_DOUT_SW], |
| &buf); |
| if (ret) |
| goto disable_efuse; |
| dev_dbg(efuse->dev, "EFUSE[%d]=0x%x\n", offset, buf); |
| *val++ = (unsigned short)buf; |
| } |
| disable_efuse: |
| /* Disable SW trigger read */ |
| regmap_write(efuse->regmap, base + efuse->data->regtbl[RG_OTP_RD_SW], 0); |
| /* Disable the efuse ctrl engine clock */ |
| regmap_write(efuse->regmap, efuse->data->ck_pdn_hwen + setoffset, |
| RG_EFUSE_CK_PDN_HWEN_MASK); |
| regmap_write(efuse->regmap, efuse->data->ck_pdn + setoffset, |
| RG_EFUSE_CK_PDN_MASK); |
| if(efuse->data->attr & EFUSE_ATTR_OSC_CK){ |
| regmap_update_bits(efuse->regmap, base + efuse->data->regtbl[RG_OTP_OSC_CK_EN_SW], |
| RG_OTP_OSC_CK_EN_SW_SEL_MASK, 0); |
| regmap_update_bits(efuse->regmap, base + efuse->data->regtbl[RG_OTP_OSC_CK_EN_SW], |
| RG_OTP_OSC_CK_EN_SW_MASK, 0); |
| } |
| unlock_efuse: |
| mutex_unlock(&efuse->lock); |
| |
| return ret; |
| } |
| |
| static int mt6359_efuse_probe(struct platform_device *pdev) |
| { |
| struct nvmem_config econfig = { }; |
| struct nvmem_device *nvmem; |
| struct mt6359_efuse *efuse; |
| struct mt6397_chip *chip; |
| int ret; |
| |
| chip = dev_get_drvdata(pdev->dev.parent); |
| efuse = devm_kzalloc(&pdev->dev, sizeof(*efuse), GFP_KERNEL); |
| if (!efuse) |
| return -ENOMEM; |
| |
| efuse->regmap = chip->regmap; |
| if (!efuse->regmap) { |
| dev_err(&pdev->dev, "failed to get efuse regmap\n"); |
| return -ENODEV; |
| } |
| |
| efuse->data = of_device_get_match_data(&pdev->dev); |
| if (!efuse->data) { |
| dev_err(&pdev->dev, "failed to get efuse data\n"); |
| return -ENODEV; |
| } |
| ret = regmap_read(efuse->regmap, efuse->data->base + efuse->data->regtbl[RG_OTP_RD_TRIG], |
| &efuse->trig_sta); |
| if (ret) |
| return ret; |
| |
| mutex_init(&efuse->lock); |
| efuse->dev = &pdev->dev; |
| platform_set_drvdata(pdev, efuse); |
| |
| econfig.stride = 2; |
| econfig.word_size = EFUSE_REG_WIDTH; |
| econfig.read_only = true; |
| econfig.name = "mt6359-efuse"; |
| econfig.size = efuse->data->reg_num * EFUSE_REG_WIDTH; |
| econfig.reg_read = mt6359_efuse_read; |
| econfig.priv = efuse; |
| econfig.dev = &pdev->dev; |
| nvmem = devm_nvmem_register(&pdev->dev, &econfig); |
| if (IS_ERR(nvmem)) { |
| dev_err(&pdev->dev, "failed to register %s nvmem config\n", |
| econfig.name); |
| mutex_destroy(&efuse->lock); |
| return PTR_ERR(nvmem); |
| } |
| |
| return 0; |
| } |
| |
| static const struct efuse_chip_data mt6330_efuse_data = { |
| .reg_num = 128, |
| .base = MT6330_OTP_CON0, |
| .ck_pdn = MT6330_TOP_CKPDN_CON1, |
| .ck_pdn_hwen = MT6330_TOP_CKHWEN_CON0, |
| .regtbl = mt6330_efuse_regs_tbl, |
| .attr = (EFUSE_ATTR_BASIC | EFUSE_ATTR_OSC_CK | EFUSE_ATTR_SPMI_8BIT) |
| }; |
| |
| static const struct efuse_chip_data mt6359_efuse_data = { |
| .reg_num = 128, |
| .base = MT6359_OTP_CON0, |
| .ck_pdn = MT6359_TOP_CKPDN_CON0, |
| .ck_pdn_hwen = MT6359_TOP_CKHWEN_CON0, |
| .regtbl = mt6359_efuse_regs_tbl, |
| .attr = EFUSE_ATTR_BASIC |
| }; |
| |
| static const struct of_device_id mt6359_efuse_of_match[] = { |
| { |
| .compatible = "mediatek,mt6330-efuse", |
| .data = &mt6330_efuse_data |
| }, { |
| .compatible = "mediatek,mt6359-efuse", |
| .data = &mt6359_efuse_data |
| }, { |
| /* sentinel */ |
| } |
| }; |
| |
| static struct platform_driver mt6359_efuse_driver = { |
| .probe = mt6359_efuse_probe, |
| .driver = { |
| .name = "mt6359-efuse", |
| .of_match_table = mt6359_efuse_of_match, |
| }, |
| }; |
| module_platform_driver(mt6359_efuse_driver); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Jeter Chen <Jeter.Chen@mediatek.com>"); |
| MODULE_DESCRIPTION("MediaTek PMIC eFuse Driver for MT6359 PMIC"); |