From: Ajay Gupta <ajayg@xxxxxxxxxx> Latest NVIDIA GPU cards have a Cypress CCGx Type-C controller over I2C interface. This UCSI I2C driver uses I2C bus driver interface for communicating with Type-C controller. Signed-off-by: Ajay Gupta <ajayg@xxxxxxxxxx> --- Changes from v1 -> v2 Fixed identation in drivers/usb/typec/ucsi/Kconfig Changes from v2 -> v3 Fixed most of comments from Heikki Rename ucsi_i2c_ccg.c -> ucsi_ccg.c drivers/usb/typec/ucsi/Kconfig | 10 + drivers/usb/typec/ucsi/Makefile | 2 + drivers/usb/typec/ucsi/ucsi_ccg.c | 417 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 429 insertions(+) create mode 100644 drivers/usb/typec/ucsi/ucsi_ccg.c diff --git a/drivers/usb/typec/ucsi/Kconfig b/drivers/usb/typec/ucsi/Kconfig index e36d6c7..7811888 100644 --- a/drivers/usb/typec/ucsi/Kconfig +++ b/drivers/usb/typec/ucsi/Kconfig @@ -23,6 +23,16 @@ config TYPEC_UCSI if TYPEC_UCSI +config UCSI_CCG + tristate "UCSI Interface Driver for Cypress CCGx" + depends on I2C + help + This driver enables UCSI support on platforms that expose a + Cypress CCGx Type-C controller over I2C interface. + + To compile the driver as a module, choose M here: the module will be + called ucsi_ccg. + config UCSI_ACPI tristate "UCSI ACPI Interface Driver" depends on ACPI diff --git a/drivers/usb/typec/ucsi/Makefile b/drivers/usb/typec/ucsi/Makefile index 7afbea5..2f4900b 100644 --- a/drivers/usb/typec/ucsi/Makefile +++ b/drivers/usb/typec/ucsi/Makefile @@ -8,3 +8,5 @@ typec_ucsi-y := ucsi.o typec_ucsi-$(CONFIG_TRACING) += trace.o obj-$(CONFIG_UCSI_ACPI) += ucsi_acpi.o + +obj-$(CONFIG_UCSI_CCG) += ucsi_ccg.o diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c new file mode 100644 index 0000000..e69cc9f --- /dev/null +++ b/drivers/usb/typec/ucsi/ucsi_ccg.c @@ -0,0 +1,417 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * UCSI driver for Cypress CCGx Type-C controller + * + * Copyright (C) 2017-2018 NVIDIA Corporation. All rights reserved. + * Author: Ajay Gupta <ajayg@xxxxxxxxxx> + * + * Some code borrowed from drivers/usb/typec/ucsi/ucsi_acpi.c + */ +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/acpi.h> +#include <linux/i2c.h> +#include <linux/pci.h> +#include "ucsi.h" + +struct ucsi_ccg { + struct device *dev; + struct ucsi *ucsi; + struct ucsi_ppm ppm; + struct i2c_client *client; + int irq; +}; + +#define CCGX_I2C_RAB_DEVICE_MODE 0x0 +#define CCGX_I2C_RAB_BOOT_MODE_REASON 0x1 +#define CCGX_I2C_RAB_READ_SILICON_ID 0x2 +#define CCGX_I2C_RAB_INTR_REG 0x6 +#define CCGX_I2C_RAB_FW1_VERSION 0x28 +#define CCGX_I2C_RAB_FW2_VERSION 0x20 +#define CCGX_I2C_RAB_UCSI_CONTROL 0x39 +#define CCGX_I2C_RAB_UCSI_CONTROL_STOP 0x2 +#define CCGX_I2C_RAB_UCSI_CONTROL_START 0x1 +#define CCGX_I2C_RAB_RESPONSE_REG 0x7E +#define CCGX_I2C_RAB_UCSI_DATA_BLOCK 0xf000 +#define CCGX_I2C_RAB_RESPONSE_REG_RESET_COMPLETE 0x80 + +static int ccg_read(struct ucsi_ccg *uc, u16 rab, u8 *data, u32 len) +{ + struct device *dev = uc->dev; + struct i2c_client *client = uc->client; + unsigned char buf[2]; + struct i2c_msg msgs[] = { + { + .addr = client->addr, + .flags = 0x0, + .len = 0x2, + .buf = buf, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .buf = data, + }, + }; + u32 rlen, rem_len = len; + int err = -EIO; + + while (rem_len > 0) { + msgs[1].buf = &data[len - rem_len]; + rlen = min_t(u16, rem_len, 4); + msgs[1].len = rlen; + buf[0] = (rab >> 0) & 0xff; + buf[1] = (rab >> 8) & 0xff; + err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (err == ARRAY_SIZE(msgs)) { + err = 0; + } else if (err >= 0) { + dev_err(dev, "i2c_transfer failed, err %d\n", err); + return -EIO; + } + rab += rlen; + rem_len -= rlen; + } + + return err; +} + +static int ccg_write(struct ucsi_ccg *uc, u16 rab, u8 *data, u32 len) +{ + struct device *dev = uc->dev; + struct i2c_client *client = uc->client; + unsigned char buf[2]; + struct i2c_msg msgs[] = { + { + .addr = client->addr, + .flags = 0x0, + .len = 0x2, + .buf = buf, + }, + { + .addr = client->addr, + .flags = 0x0, + .buf = data, + .len = len, + }, + { + .addr = client->addr, + .flags = I2C_M_STOP, + }, + }; + int err; + + buf[0] = (rab >> 0) & 0xff; + buf[1] = (rab >> 8) & 0xff; + err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (err == ARRAY_SIZE(msgs)) { + err = 0; + } else if (err >= 0) { + dev_err(dev, "i2c_transfer failed, err %d\n", err); + return -EIO; + } + + return err; +} + +static int ucsi_ccg_init(struct ucsi_ccg *uc) +{ + struct device *dev = uc->dev; + u8 data[64]; + int i, err; + + /* selectively issue device reset + * - if RESPONSE register is RESET_COMPLETE, do not issue device reset + * (will cause usb device disconnect / reconnect) + * - if RESPONSE register is not RESET_COMPLETE, issue device reset + * (causes PPC to resync device connect state by re-issuing + * set mux command) + */ + data[0] = 0x00; + data[1] = 0x00; + + err = ccg_read(uc, CCGX_I2C_RAB_RESPONSE_REG, data, 0x2); + if (err < 0) { + dev_err(dev, "ccg_read failed, err %d\n", err); + return -EIO; + } + + memset(data, 0, sizeof(data)); + err = ccg_read(uc, CCGX_I2C_RAB_DEVICE_MODE, data, sizeof(data)); + if (err < 0) { + dev_err(dev, "ccg_read failed, err %d\n", err); + return -EIO; + } + + dev_info(dev, "Silicon id %02x %02x", + data[CCGX_I2C_RAB_READ_SILICON_ID + 0], + data[CCGX_I2C_RAB_READ_SILICON_ID + 1]); + + dev_info(dev, "FW1 version %02x %02x %02x %02x %02x %02x %02x %02x\n", + data[CCGX_I2C_RAB_FW1_VERSION + 0], + data[CCGX_I2C_RAB_FW1_VERSION + 1], + data[CCGX_I2C_RAB_FW1_VERSION + 2], + data[CCGX_I2C_RAB_FW1_VERSION + 3], + data[CCGX_I2C_RAB_FW1_VERSION + 4], + data[CCGX_I2C_RAB_FW1_VERSION + 5], + data[CCGX_I2C_RAB_FW1_VERSION + 6], + data[CCGX_I2C_RAB_FW1_VERSION + 7]); + + dev_info(dev, "FW2 version %02x %02x %02x %02x %02x %02x %02x %02x\n", + data[CCGX_I2C_RAB_FW2_VERSION + 0], + data[CCGX_I2C_RAB_FW2_VERSION + 1], + data[CCGX_I2C_RAB_FW2_VERSION + 2], + data[CCGX_I2C_RAB_FW2_VERSION + 3], + data[CCGX_I2C_RAB_FW2_VERSION + 4], + data[CCGX_I2C_RAB_FW2_VERSION + 5], + data[CCGX_I2C_RAB_FW2_VERSION + 6], + data[CCGX_I2C_RAB_FW2_VERSION + 7]); + + data[0] = 0x0; + data[1] = 0x0; + err = ccg_read(uc, CCGX_I2C_RAB_RESPONSE_REG, data, 0x2); + if (err < 0) { + dev_err(dev, "ccg_read failed, err %d\n", err); + return -EIO; + } + + data[0] = CCGX_I2C_RAB_UCSI_CONTROL_STOP; + err = ccg_write(uc, CCGX_I2C_RAB_UCSI_CONTROL, data, 0x1); + if (err < 0) { + dev_err(dev, "ccg_write failed, err %d\n", err); + return -EIO; + } + + data[0] = CCGX_I2C_RAB_UCSI_CONTROL_START; + err = ccg_write(uc, CCGX_I2C_RAB_UCSI_CONTROL, data, 0x1); + if (err < 0) { + dev_err(dev, "ccg_write failed, err %d\n", err); + return -EIO; + } + + /* flush CCGx RESPONSE queue by acking interrupts + * - above ucsi control register write will push response + * which must be flushed + * - affects f/w update which reads response register + */ + data[0] = 0xff; + for (i = 0; (i < 10) && (data[0] != 0x00); i++) { + err = ccg_write(uc, CCGX_I2C_RAB_INTR_REG, data, 0x1); + if (err < 0) { + dev_err(dev, "ccg_write failed, err %d\n", err); + return -EIO; + } + + usleep_range(10000, 11000); + + err = ccg_read(uc, CCGX_I2C_RAB_INTR_REG, data, 0x1); + if (err < 0) { + dev_err(dev, "ccg_read failed, err %d\n", err); + return -EIO; + } + } + return 0; +} + +static int ucsi_ccg_send_data(struct ucsi_ccg *uc) +{ + int err; + unsigned char buf[4] = { + 0x20, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8), + 0x8, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8), + }; + unsigned char buf1[16]; + unsigned char buf2[8]; + + memcpy(&buf1[0], ((const void *)uc->ppm.data) + 0x20, sizeof(buf1)); + memcpy(&buf2[0], ((const void *)uc->ppm.data) + 0x8, sizeof(buf2)); + + err = ccg_write(uc, *(u16 *)buf, buf1, sizeof(buf1)); + if (err < 0) { + dev_err(uc->dev, "ccg_write failed, err %d\n", err); + return -EIO; + } + + err = ccg_write(uc, *(u16 *)(buf + 2), buf2, sizeof(buf2)); + if (err < 0) { + dev_err(uc->dev, "ccg_write failed, err %d\n", err); + return -EIO; + } + + return err; +} + +static int ucsi_ccg_recv_data(struct ucsi_ccg *uc) +{ + static int first = 1; + int err; + unsigned char buf[6] = { + 0x0, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8), + 0x4, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8), + 0x10, (CCGX_I2C_RAB_UCSI_DATA_BLOCK >> 8), + }; + u8 *ppm = (u8 *)uc->ppm.data; + + if (first) { + err = ccg_read(uc, *(u16 *)buf, ppm, 0x2); + if (err < 0) { + dev_err(uc->dev, "ccg_read failed, err %d\n", err); + return -EIO; + } + first = 1; + } + + err = ccg_read(uc, *(u16 *)(buf + 2), ppm + 0x4, 0x4); + if (err < 0) { + dev_err(uc->dev, "ccg_read failed, err %d\n", err); + return -EIO; + } + + err = ccg_read(uc, *(u16 *)(buf + 4), ppm + 0x10, 0x10); + if (err < 0) { + dev_err(uc->dev, "ccg_read failed, err %d\n", err); + return -EIO; + } + + return err; +} + +static int ucsi_ccg_ack_interrupt(struct ucsi_ccg *uc) +{ + int err; + unsigned char buf[3] = {(CCGX_I2C_RAB_INTR_REG & 0xff), + (CCGX_I2C_RAB_INTR_REG >> 8), 0x0}; + + err = ccg_read(uc, *(u16 *)buf, &buf[2], 0x1); + if (err < 0) { + dev_err(uc->dev, "ccg_read failed, err %d\n", err); + return -EIO; + } + + err = ccg_write(uc, *(u16 *)buf, &buf[2], 0x1); + if (err < 0) { + dev_err(uc->dev, "ccg_read failed, err %d\n", err); + return -EIO; + } + + return err; +} + +static int ucsi_ccg_sync(struct ucsi_ppm *ppm) +{ + struct ucsi_ccg *uc = container_of(ppm, + struct ucsi_ccg, ppm); + int err; + + err = ucsi_ccg_recv_data(uc); + if (err < 0) { + dev_err(uc->dev, "ucsi_ccg_recv_data() err %d\n", err); + return 0; + } + + /* ack interrupt to allow next command to run */ + err = ucsi_ccg_ack_interrupt(uc); + if (err < 0) + dev_err(uc->dev, "ucsi_ccg_ack_interrupt() err %d\n", err); + + return 0; +} + +static int ucsi_ccg_cmd(struct ucsi_ppm *ppm, struct ucsi_control *ctrl) +{ + struct ucsi_ccg *uc = container_of(ppm, + struct ucsi_ccg, ppm); + int err = 0; + + ppm->data->ctrl.raw_cmd = ctrl->raw_cmd; + err = ucsi_ccg_send_data(uc); + + return err; +} + +static irqreturn_t ccg_irq_handler(int irq, void *data) +{ + struct ucsi_ccg *uc = data; + + ucsi_notify(uc->ucsi); + + return IRQ_HANDLED; +} + +static int ucsi_ccg_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct ucsi_ccg *uc; + int status; + + uc = devm_kzalloc(dev, sizeof(*uc), GFP_KERNEL); + if (!uc) + return -ENOMEM; + + uc->ppm.data = devm_kzalloc(dev, sizeof(struct ucsi_data), GFP_KERNEL); + if (!uc->ppm.data) + return -ENOMEM; + + uc->ppm.cmd = ucsi_ccg_cmd; + uc->ppm.sync = ucsi_ccg_sync; + uc->dev = dev; + uc->client = client; + + /* reset ccg device and initialize ucsi */ + status = ucsi_ccg_init(uc); + if (status < 0) { + dev_err(uc->dev, "ucsi_ccg_init failed - %d\n", status); + return status; + } + + uc->irq = client->irq; + + status = devm_request_threaded_irq(dev, uc->irq, NULL, ccg_irq_handler, + IRQF_ONESHOT | IRQF_TRIGGER_HIGH, + dev_name(dev), uc); + if (status < 0) { + dev_err(uc->dev, "request_threaded_irq failed - %d\n", status); + return status; + } + + uc->ucsi = ucsi_register_ppm(dev, &uc->ppm); + if (IS_ERR(uc->ucsi)) { + dev_err(uc->dev, "ucsi_register_ppm failed\n"); + return PTR_ERR(uc->ucsi); + } + + i2c_set_clientdata(client, uc); + return 0; +} + +static int ucsi_ccg_remove(struct i2c_client *client) +{ + struct ucsi_ccg *uc = i2c_get_clientdata(client); + + ucsi_unregister_ppm(uc->ucsi); + + return 0; +} + +static const struct i2c_device_id ucsi_ccg_device_id[] = { + {"ccgx-ucsi", 0}, + {}, +}; +MODULE_DEVICE_TABLE(i2c, ucsi_ccg_device_id); + +static struct i2c_driver ucsi_ccg_driver = { + .driver = { + .name = "ucsi_ccg", + }, + .probe = ucsi_ccg_probe, + .remove = ucsi_ccg_remove, + .id_table = ucsi_ccg_device_id, +}; + +module_i2c_driver(ucsi_ccg_driver); + +MODULE_AUTHOR("Ajay Gupta <ajayg@xxxxxxxxxx>"); +MODULE_DESCRIPTION("UCSI driver for Cypress CCGx Type-C controller"); +MODULE_LICENSE("GPL v2"); -- 2.7.4