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Tue, 22 Sep 2020 03:21:21 -0700 (PDT) From: Gene Chen To: lee.jones@linaro.org, matthias.bgg@gmail.com Subject: [PATCH v5 10/10] mfd: mt6360: Merge different sub-devices I2C read/write Date: Tue, 22 Sep 2020 18:20:18 +0800 Message-Id: <1600770019-11585-11-git-send-email-gene.chen.richtek@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1600770019-11585-1-git-send-email-gene.chen.richtek@gmail.com> References: <1600770019-11585-1-git-send-email-gene.chen.richtek@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200922_062125_734295_98E2FCF2 X-CRM114-Status: GOOD ( 24.03 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:442 listed in] [list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider [gene.chen.richtek[at]gmail.com] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: gene_chen@richtek.com, linux-kernel@vger.kernel.org, cy_huang@richtek.com, benjamin.chao@mediatek.com, linux-mediatek@lists.infradead.org, Wilma.Wu@mediatek.com, linux-arm-kernel@lists.infradead.org, shufan_lee@richtek.com MIME-Version: 1.0 Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org From: Gene Chen Merge different sub-devices I2C read/write functions into one Regmap, because PMIC and LDO part need CRC bits for access protection. Signed-off-by: Gene Chen --- drivers/mfd/Kconfig | 1 + drivers/mfd/mt6360-core.c | 224 ++++++++++++++++++++++++++++++++++++++-------- 2 files changed, 190 insertions(+), 35 deletions(-) diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 33df083..1dfe446 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -913,6 +913,7 @@ config MFD_MT6360 select MFD_CORE select REGMAP_I2C select REGMAP_IRQ + select CRC8 depends on I2C help Say Y here to enable MT6360 PMU/PMIC/LDO functional support. diff --git a/drivers/mfd/mt6360-core.c b/drivers/mfd/mt6360-core.c index 075b466..2ec9559 100644 --- a/drivers/mfd/mt6360-core.c +++ b/drivers/mfd/mt6360-core.c @@ -62,6 +62,18 @@ struct mt6360_ddata { #define MT6360_CRC8_POLYNOMIAL 0x7 +#define MT6360_CRC_I2C_ADDR_SIZE 1 +#define MT6360_CRC_REG_ADDR_SIZE 1 +/* prealloca read size = i2c device addr + i2c reg addr + val ... + crc8 */ +#define MT6360_ALLOC_READ_SIZE(_size) (_size + 3) +/* prealloca write size = i2c device addr + i2c reg addr + val ... + crc8 + dummy byte */ +#define MT6360_ALLOC_WRITE_SIZE(_size) (_size + 4) +#define MT6360_CRC_PREDATA_OFFSET (MT6360_CRC_I2C_ADDR_SIZE + MT6360_CRC_REG_ADDR_SIZE) +#define MT6360_CRC_CRC8_SIZE 1 +#define MT6360_CRC_DUMMY_BYTE_SIZE 1 +#define MT6360_REGMAP_REG_BYTE_SIZE 2 +#define I2C_ADDR_XLATE_8BIT(_addr, _rw) (((_addr & 0x7F) << 1) + _rw) + /* reg 0 -> 0 ~ 7 */ #define MT6360_CHG_TREG_EVT 4 #define MT6360_CHG_AICR_EVT 5 @@ -266,12 +278,6 @@ static const struct regmap_irq_chip mt6360_irq_chip = { .use_ack = true, }; -static const struct regmap_config mt6360_pmu_regmap_config = { - .reg_bits = 8, - .val_bits = 8, - .max_register = MT6360_PMU_MAXREG, -}; - static const struct resource mt6360_adc_resources[] = { DEFINE_RES_IRQ_NAMED(MT6360_ADC_DONEI, "adc_donei"), }; @@ -334,7 +340,7 @@ static const struct mfd_cell mt6360_devs[] = { OF_MFD_CELL("mt6360-led", mt6360_led_resources, NULL, 0, 0, "mediatek,mt6360-led"), OF_MFD_CELL("mt6360-regulator", mt6360_regulator_resources, - NULL, 0, 0, "mediatek,mt6360-regulator"), + NULL, 0, 0, NULL), OF_MFD_CELL("mt6360-tcpc", NULL, NULL, 0, 0, "mediatek,mt6360-tcpc"), }; @@ -349,7 +355,7 @@ static int mt6360_check_vendor_info(struct mt6360_ddata *ddata) return ret; if ((info & CHIP_VEN_MASK) != CHIP_VEN_MT6360) { - dev_err(&client->dev, "Device not supported\n"); + dev_err(ddata->dev, "Device not supported\n"); return -ENODEV; } @@ -358,11 +364,161 @@ static int mt6360_check_vendor_info(struct mt6360_ddata *ddata) return 0; } -static const unsigned short mt6360_slave_addr[MT6360_SLAVE_MAX] = { - MT6360_PMU_SLAVEID, +static const unsigned short mt6360_slave_addrs[MT6360_SLAVE_MAX] = { + MT6360_TCPC_SLAVEID, MT6360_PMIC_SLAVEID, MT6360_LDO_SLAVEID, - MT6360_TCPC_SLAVEID, + MT6360_PMU_SLAVEID, +}; + +static int mt6360_xlate_pmicldo_addr(u8 *addr, int rw_size) +{ + /* Address is already in encoded [5:0] */ + *addr &= MT6360_ADDRESS_MASK; + + switch (rw_size) { + case 1: + *addr |= MT6360_DATA_SIZE_1_BYTE; + break; + case 2: + *addr |= MT6360_DATA_SIZE_2_BYTES; + break; + case 3: + *addr |= MT6360_DATA_SIZE_3_BYTES; + break; + case 4: + *addr |= MT6360_DATA_SIZE_4_BYTES; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int mt6360_regmap_read(void *context, const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + struct mt6360_ddata *ddata = context; + u8 bank = *(u8 *)reg; + u8 reg_addr = *(u8 *)(reg + 1); + struct i2c_client *i2c = ddata->i2c[bank]; + bool crc_needed = false; + u8 *buf; + int buf_len = MT6360_ALLOC_READ_SIZE(val_size); + int read_size = val_size; + u8 crc; + int ret; + + if (bank == MT6360_SLAVE_PMIC || bank == MT6360_SLAVE_LDO) { + crc_needed = true; + ret = mt6360_xlate_pmicldo_addr(®_addr, val_size); + if (ret < 0) + return ret; + read_size += MT6360_CRC_CRC8_SIZE; + } + + buf = kzalloc(buf_len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + buf[0] = I2C_ADDR_XLATE_8BIT(i2c->addr, I2C_SMBUS_READ); + buf[1] = reg_addr; + + ret = i2c_smbus_read_i2c_block_data(i2c, reg_addr, read_size, + buf + MT6360_CRC_PREDATA_OFFSET); + if (ret < 0) + goto out; + else if (ret != read_size) { + ret = -EIO; + goto out; + } + + if (crc_needed) { + crc = crc8(ddata->crc8_tbl, buf, val_size + MT6360_CRC_PREDATA_OFFSET, 0); + if (crc != buf[val_size + MT6360_CRC_PREDATA_OFFSET]) { + ret = -EIO; + goto out; + } + } + + memcpy(val, buf + MT6360_CRC_PREDATA_OFFSET, val_size); +out: + kfree(buf); + return (ret < 0) ? ret : 0; +} + +static int mt6360_regmap_write(void *context, const void *val, size_t val_size) +{ + struct mt6360_ddata *ddata = context; + u8 bank = *(u8 *)val; + u8 reg_addr = *(u8 *)(val + 1); + struct i2c_client *i2c = ddata->i2c[bank]; + bool crc_needed = false; + u8 *buf; + int buf_len = MT6360_ALLOC_WRITE_SIZE(val_size); + int write_size = val_size - MT6360_REGMAP_REG_BYTE_SIZE; + int ret; + + if (bank == MT6360_SLAVE_PMIC || bank == MT6360_SLAVE_LDO) { + crc_needed = true; + ret = mt6360_xlate_pmicldo_addr(®_addr, val_size - MT6360_REGMAP_REG_BYTE_SIZE); + if (ret < 0) + return ret; + } + + buf = kzalloc(buf_len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + buf[0] = I2C_ADDR_XLATE_8BIT(i2c->addr, I2C_SMBUS_WRITE); + buf[1] = reg_addr; + memcpy(buf + MT6360_CRC_PREDATA_OFFSET, val + MT6360_REGMAP_REG_BYTE_SIZE, write_size); + + if (crc_needed) { + buf[val_size] = crc8(ddata->crc8_tbl, buf, val_size, 0); + write_size += (MT6360_CRC_CRC8_SIZE + MT6360_CRC_DUMMY_BYTE_SIZE); + } + + ret = i2c_smbus_write_i2c_block_data(i2c, reg_addr, write_size, + buf + MT6360_CRC_PREDATA_OFFSET); + + kfree(buf); + return ret; +} + +static const struct regmap_bus mt6360_regmap_bus = { + .read = mt6360_regmap_read, + .write = mt6360_regmap_write, + + /* Due to PMIC and LDO CRC access size limit */ + .max_raw_read = 4, + .max_raw_write = 4, +}; + +static bool mt6360_is_readwrite_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case MT6360_REG_TCPCSTART ... MT6360_REG_TCPCEND: + fallthrough; + case MT6360_REG_PMICSTART ... MT6360_REG_PMICEND: + fallthrough; + case MT6360_REG_LDOSTART ... MT6360_REG_LDOEND: + fallthrough; + case MT6360_REG_PMUSTART ... MT6360_REG_PMUEND: + return true; + } + + return false; +} + +static const struct regmap_config mt6360_regmap_config = { + .reg_bits = 16, + .val_bits = 8, + .reg_format_endian = REGMAP_ENDIAN_BIG, + .max_register = MT6360_REG_PMUEND, + .writeable_reg = mt6360_is_readwrite_reg, + .readable_reg = mt6360_is_readwrite_reg, }; static int mt6360_probe(struct i2c_client *client) @@ -375,9 +531,23 @@ static int mt6360_probe(struct i2c_client *client) return -ENOMEM; ddata->dev = &client->dev; - i2c_set_clientdata(client, ddata); - ddata->regmap = devm_regmap_init_i2c(client, &mt6360_pmu_regmap_config); + for (i = 0; i < MT6360_SLAVE_MAX - 1; i++) { + ddata->i2c[i] = devm_i2c_new_dummy_device(&client->dev, + client->adapter, + mt6360_slave_addrs[i]); + if (IS_ERR(ddata->i2c[i])) { + dev_err(&client->dev, + "Failed to get new dummy I2C device for address 0x%x", + mt6360_slave_addrs[i]); + return PTR_ERR(ddata->i2c[i]); + } + } + ddata->i2c[MT6360_SLAVE_MAX - 1] = client; + + crc8_populate_msb(ddata->crc8_tbl, MT6360_CRC8_POLYNOMIAL); + ddata->regmap = devm_regmap_init(ddata->dev, &mt6360_regmap_bus, ddata, + &mt6360_regmap_config); if (IS_ERR(ddata->regmap)) { dev_err(&client->dev, "Failed to register regmap\n"); return PTR_ERR(ddata->regmap); @@ -387,34 +557,18 @@ static int mt6360_probe(struct i2c_client *client) if (ret) return ret; - ret = devm_regmap_add_irq_chip(&client->dev, ddata->regmap, client->irq, - 0, 0, &mt6360_irq_chip, - &ddata->irq_data); + ret = devm_regmap_add_irq_chip(&client->dev, ddata->regmap, client->irq, 0, 0, + &mt6360_irq_chip, &ddata->irq_data); if (ret) { dev_err(&client->dev, "Failed to add Regmap IRQ Chip\n"); return ret; } - ddata->i2c[0] = client; - for (i = 1; i < MT6360_SLAVE_MAX; i++) { - ddata->i2c[i] = devm_i2c_new_dummy_device(&client->dev, - client->adapter, - mt6360_slave_addr[i]); - if (IS_ERR(ddata->i2c[i])) { - dev_err(&client->dev, - "Failed to get new dummy I2C device for address 0x%x", - mt6360_slave_addr[i]); - return PTR_ERR(ddata->i2c[i]); - } - i2c_set_clientdata(ddata->i2c[i], ddata); - } - - ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO, - mt6360_devs, ARRAY_SIZE(mt6360_devs), NULL, - 0, regmap_irq_get_domain(ddata->irq_data)); + ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO, mt6360_devs, + ARRAY_SIZE(mt6360_devs), NULL, 0, + regmap_irq_get_domain(ddata->irq_data)); if (ret) { - dev_err(&client->dev, - "Failed to register subordinate devices\n"); + dev_err(&client->dev, "Failed to register subordinate devices\n"); return ret; }