Re: [PATCH 2/3] staging/nvec: reimplement on top of tegra i2c driver

From: Marc Dietrich
Date: Thu Jan 29 2015 - 04:54:19 EST

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Am Donnerstag, 29. Januar 2015, 10:20:21 schrieb Andrey Danin:
> Remove i2c controller related code and use tegra i2c driver in slave mode.

the diff is hard to review. Maybe it would be better to first ifdef 0 the old
code (isr and init) while adding the new code, and then remove the old code in
a second patch. Or maybe split it into small chunks.

> Signed-off-by: Andrey Danin <danindrey@xxxxxxx>
> ---
> drivers/staging/nvec/nvec.c | 379
> ++++++++++++++------------------------------ drivers/staging/nvec/nvec.h |
> 17 +-
> 2 files changed, 122 insertions(+), 274 deletions(-)
>
> diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
> index 120b70d..d645c58 100644
> --- a/drivers/staging/nvec/nvec.c
> +++ b/drivers/staging/nvec/nvec.c
> @@ -25,8 +25,8 @@
> #include <linux/err.h>
> #include <linux/gpio.h>
> #include <linux/interrupt.h>
> +#include <linux/i2c.h>
> #include <linux/io.h>
> -#include <linux/irq.h>
> #include <linux/of.h>
> #include <linux/of_gpio.h>
> #include <linux/list.h>
> @@ -39,25 +39,12 @@
>
> #include "nvec.h"
>
> -#define I2C_CNFG 0x00
> -#define I2C_CNFG_PACKET_MODE_EN (1<<10)
> -#define I2C_CNFG_NEW_MASTER_SFM (1<<11)
> -#define I2C_CNFG_DEBOUNCE_CNT_SHIFT 12
> -
> -#define I2C_SL_CNFG 0x20
> -#define I2C_SL_NEWSL (1<<2)
> -#define I2C_SL_NACK (1<<1)
> -#define I2C_SL_RESP (1<<0)
> -#define I2C_SL_IRQ (1<<3)
> -#define END_TRANS (1<<4)
> -#define RCVD (1<<2)
> -#define RNW (1<<1)
> -
> -#define I2C_SL_RCVD 0x24
> -#define I2C_SL_STATUS 0x28
> -#define I2C_SL_ADDR1 0x2c
> -#define I2C_SL_ADDR2 0x30
> -#define I2C_SL_DELAY_COUNT 0x3c
> +
> +#define I2C_SL_ST_END_TRANS (1<<4)
> +#define I2C_SL_ST_IRQ (1<<3)
> +#define I2C_SL_ST_RCVD (1<<2)
> +#define I2C_SL_ST_RNW (1<<1)
> +
>
> /**
> * enum nvec_msg_category - Message categories for nvec_msg_alloc()
> @@ -327,6 +314,7 @@ struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec,
>
> mutex_unlock(&nvec->sync_write_mutex);
>
> +

stray new line.

> return msg;
> }
> EXPORT_SYMBOL(nvec_write_sync);
> @@ -475,11 +463,13 @@ static void nvec_tx_completed(struct nvec_chip *nvec)
> {
> /* We got an END_TRANS, let's skip this, maybe there's an event */
> if (nvec->tx->pos != nvec->tx->size) {
> - dev_err(nvec->dev, "premature END_TRANS, resending\n");
> + dev_err(nvec->dev, "premature END_TRANS, resending: pos:%u, size:
%u\n",
> + nvec->tx->pos, nvec->tx->size);
> nvec->tx->pos = 0;
> nvec_gpio_set_value(nvec, 0);
> } else {
> - nvec->state = 0;
> + nvec->state = ST_NONE;
> + nvec->tx->pos = 0;
> }
> }
>
> @@ -497,7 +487,7 @@ static void nvec_rx_completed(struct nvec_chip *nvec)
> (uint) nvec->rx->pos);
>
> nvec_msg_free(nvec, nvec->rx);
> - nvec->state = 0;
> + nvec->state = ST_NONE;
>
> /* Battery quirk - Often incomplete, and likes to crash */
> if (nvec->rx->data[0] == NVEC_BAT)
> @@ -514,7 +504,7 @@ static void nvec_rx_completed(struct nvec_chip *nvec)
>
> spin_unlock(&nvec->rx_lock);
>
> - nvec->state = 0;
> + nvec->state = ST_NONE;
>
> if (!nvec_msg_is_event(nvec->rx))
> complete(&nvec->ec_transfer);
> @@ -523,21 +513,6 @@ static void nvec_rx_completed(struct nvec_chip *nvec)
> }
>
> /**
> - * nvec_invalid_flags - Send an error message about invalid flags and jump
> - * @nvec: The nvec device
> - * @status: The status flags
> - * @reset: Whether we shall jump to state 0.
> - */
> -static void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status,
> - bool reset)
> -{
> - dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n",
> - status, nvec->state);
> - if (reset)
> - nvec->state = 0;
> -}
> -
> -/**
> * nvec_tx_set - Set the message to transfer (nvec->tx)
> * @nvec: A &struct nvec_chip
> *
> @@ -566,150 +541,85 @@ static void nvec_tx_set(struct nvec_chip *nvec)
> (uint)nvec->tx->size, nvec->tx->data[1]);
> }
>
> +
> /**
> - * nvec_interrupt - Interrupt handler
> - * @irq: The IRQ
> - * @dev: The nvec device
> + * nvec_slave_cb - I2C slave callback
> *
> - * Interrupt handler that fills our RX buffers and empties our TX
> - * buffers. This uses a finite state machine with ridiculous amounts
> - * of error checking, in order to be fairly reliable.
> + * This callback fills our RX buffers and empties our TX
> + * buffers. This uses a finite state machine.
> */
> -static irqreturn_t nvec_interrupt(int irq, void *dev)
> +static int nvec_slave_cb(struct i2c_client *client,
> + enum i2c_slave_event event, u8 *val)
> {
> - unsigned long status;
> - unsigned int received = 0;
> - unsigned char to_send = 0xff;
> - const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW;
> - struct nvec_chip *nvec = dev;
> - unsigned int state = nvec->state;
> -
> - status = readl(nvec->base + I2C_SL_STATUS);
> -
> - /* Filter out some errors */
> - if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) {
> - dev_err(nvec->dev, "unexpected irq mask %lx\n", status);
> - return IRQ_HANDLED;
> - }
> - if ((status & I2C_SL_IRQ) == 0) {
> - dev_err(nvec->dev, "Spurious IRQ\n");
> - return IRQ_HANDLED;
> - }
> -
> - /* The EC did not request a read, so it send us something, read it */
> - if ((status & RNW) == 0) {
> - received = readl(nvec->base + I2C_SL_RCVD);
> - if (status & RCVD)
> - writel(0, nvec->base + I2C_SL_RCVD);
> - }
> + struct nvec_chip *nvec = i2c_get_clientdata(client);
>
> - if (status == (I2C_SL_IRQ | RCVD))
> - nvec->state = 0;
> -
> - switch (nvec->state) {
> - case 0: /* Verify that its a transfer start, the rest later */
> - if (status != (I2C_SL_IRQ | RCVD))
> - nvec_invalid_flags(nvec, status, false);
> - break;
> - case 1: /* command byte */
> - if (status != I2C_SL_IRQ) {
> - nvec_invalid_flags(nvec, status, true);
> - } else {
> + switch (event) {
> + case I2C_SLAVE_REQ_WRITE_END:
> + if (nvec->state == ST_NONE) {
> nvec->rx = nvec_msg_alloc(nvec, NVEC_MSG_RX);
> /* Should not happen in a normal world */
> if (unlikely(nvec->rx == NULL)) {
> - nvec->state = 0;
> - break;
> + nvec->state = ST_NONE;
> + return -1;
> }
> - nvec->rx->data[0] = received;
> - nvec->rx->pos = 1;
> - nvec->state = 2;
> + nvec->rx->pos = 0;
> +
> + if (client->addr != ((*val) >> 1)) {
> + dev_err(&client->dev,
> + "received address 0x%02x, expected 0x%02x\n",
> + ((*val) >> 1), client->addr);
> + }
> + nvec->state = ST_TRANS_START;
> + nvec->rx->pos = 0;
> + break;
> }
> +
> + nvec->rx->data[nvec->rx->pos++] = *val;
> + nvec->state = ST_RX;
> break;
> - case 2: /* first byte after command */
> - if (status == (I2C_SL_IRQ | RNW | RCVD)) {
> - udelay(33);
> - if (nvec->rx->data[0] != 0x01) {
> - dev_err(nvec->dev,
> - "Read without prior read command\n");
> - nvec->state = 0;
> - break;
> - }
> +
> + case I2C_SLAVE_REQ_READ_START:
> + if (nvec->state == ST_NONE) {
> + dev_err(&client->dev,
> + "unexpected read without transaction start, state %d\n",
> + nvec->state);
> + return -1;
> + }
> +
> + if (nvec->state == ST_RX) {
> nvec_msg_free(nvec, nvec->rx);
> - nvec->state = 3;
> nvec_tx_set(nvec);
> - BUG_ON(nvec->tx->size < 1);
> - to_send = nvec->tx->data[0];
> - nvec->tx->pos = 1;
> - } else if (status == (I2C_SL_IRQ)) {
> - BUG_ON(nvec->rx == NULL);
> - nvec->rx->data[1] = received;
> - nvec->rx->pos = 2;
> - nvec->state = 4;
> - } else {
> - nvec_invalid_flags(nvec, status, true);
> }
> - break;
> - case 3: /* EC does a block read, we transmit data */
> - if (status & END_TRANS) {
> - nvec_tx_completed(nvec);
> - } else if ((status & RNW) == 0 || (status & RCVD)) {
> - nvec_invalid_flags(nvec, status, true);
> - } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) {
> - to_send = nvec->tx->data[nvec->tx->pos++];
> - } else {
> +
> + if (!nvec->tx || nvec->tx->pos >= nvec->tx->size) {
> dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n",
> nvec->tx,
> (uint) (nvec->tx ? nvec->tx->pos : 0),
> (uint) (nvec->tx ? nvec->tx->size : 0));
> - nvec->state = 0;
> + nvec->state = ST_NONE;
> + break;
> }
> - break;
> - case 4: /* EC does some write, we read the data */
> - if ((status & (END_TRANS | RNW)) == END_TRANS)
> - nvec_rx_completed(nvec);
> - else if (status & (RNW | RCVD))
> - nvec_invalid_flags(nvec, status, true);
> - else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE)
> - nvec->rx->data[nvec->rx->pos++] = received;
> - else
> - dev_err(nvec->dev,
> - "RX buffer overflow on %p: Trying to write byte %u of %u\n",
> - nvec->rx, nvec->rx ? nvec->rx->pos : 0,
> - NVEC_MSG_SIZE);
> - break;
> - default:
> - nvec->state = 0;
> - }
> -
> - /* If we are told that a new transfer starts, verify it */
> - if ((status & (RCVD | RNW)) == RCVD) {
> - if (received != nvec->i2c_addr)
> - dev_err(nvec->dev,
> - "received address 0x%02x, expected 0x%02x\n",
> - received, nvec->i2c_addr);
> - nvec->state = 1;
> - }
>
> - /* Send data if requested, but not on end of transmission */
> - if ((status & (RNW | END_TRANS)) == RNW)
> - writel(to_send, nvec->base + I2C_SL_RCVD);
> + nvec->state = ST_TX;
> + *val = nvec->tx->data[nvec->tx->pos];
> + break;
>
> - /* If we have send the first byte */
> - if (status == (I2C_SL_IRQ | RNW | RCVD))
> + case I2C_SLAVE_REQ_READ_END:
> + nvec->tx->pos++;
> nvec_gpio_set_value(nvec, 1);
> + break;
>
> - dev_dbg(nvec->dev,
> - "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n",
> - (status & RNW) == 0 ? "received" : "R=",
> - received,
> - (status & (RNW | END_TRANS)) ? "sent" : "S=",
> - to_send,
> - state,
> - status & END_TRANS ? " END_TRANS" : "",
> - status & RCVD ? " RCVD" : "",
> - status & RNW ? " RNW" : "");
> + case I2C_SLAVE_STOP:
> + if (nvec->state == ST_TX)
> + nvec_tx_completed(nvec);
> + else if (nvec->state == ST_RX)
> + nvec_rx_completed(nvec);
> + nvec->state = ST_NONE;
> + break;
>
> + default:
> + return 0;
> + }
>
> /*
> * TODO: A correct fix needs to be found for this.
> @@ -717,44 +627,18 @@ static irqreturn_t nvec_interrupt(int irq, void *dev)
> * We experience less incomplete messages with this delay than without
> * it, but we don't know why. Help is appreciated.
> */
> - udelay(100);
> -
> - return IRQ_HANDLED;
> -}
> -
> -static void tegra_init_i2c_slave(struct nvec_chip *nvec)
> -{
> - u32 val;
> -
> - clk_prepare_enable(nvec->i2c_clk);
> -
> - reset_control_assert(nvec->rst);
> - udelay(2);
> - reset_control_deassert(nvec->rst);
> -
> - val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN |
> - (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT);
> - writel(val, nvec->base + I2C_CNFG);
> -
> - clk_set_rate(nvec->i2c_clk, 8 * 80000);
> -
> - writel(I2C_SL_NEWSL, nvec->base + I2C_SL_CNFG);
> - writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT);
> -
> - writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1);
> - writel(0, nvec->base + I2C_SL_ADDR2);
> -
> - enable_irq(nvec->irq);
> -}
> + switch (event) {
> + case I2C_SLAVE_REQ_WRITE_END:
> + case I2C_SLAVE_REQ_READ_END:
> + case I2C_SLAVE_STOP:
> + udelay(100);

maybe re-add the original comment here. Is this delay still required?

> + break;
> + default:
> + break;
> + }
>
> -#ifdef CONFIG_PM_SLEEP
> -static void nvec_disable_i2c_slave(struct nvec_chip *nvec)
> -{
> - disable_irq(nvec->irq);
> - writel(I2C_SL_NEWSL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG);
> - clk_disable_unprepare(nvec->i2c_clk);
> + return 0;
> }
> -#endif
>
> static void nvec_power_off(void)
> {
> @@ -767,7 +651,7 @@ static void nvec_power_off(void)
> /*
> * Parse common device tree data
> */
> -static int nvec_i2c_parse_dt_pdata(struct nvec_chip *nvec)
> +static int nvec_i2c_parse_dt(struct nvec_chip *nvec)
> {
> nvec->gpio = of_get_named_gpio(nvec->dev->of_node, "request-gpios", 0);
>
> @@ -776,68 +660,39 @@ static int nvec_i2c_parse_dt_pdata(struct nvec_chip
> *nvec) return -ENODEV;
> }
>
> - if (of_property_read_u32(nvec->dev->of_node, "slave-addr",
> - &nvec->i2c_addr)) {
> - dev_err(nvec->dev, "no i2c address specified");
> - return -ENODEV;
> - }
> -
> return 0;
> }
>
> -static int tegra_nvec_probe(struct platform_device *pdev)
> +static int nvec_probe(struct i2c_client *client, const struct i2c_device_id
> *id) {
> - int err, ret;
> - struct clk *i2c_clk;
> + int ret;
> struct nvec_chip *nvec;
> struct nvec_msg *msg;
> - struct resource *res;
> - void __iomem *base;
> - char get_firmware_version[] = { NVEC_CNTL, GET_FIRMWARE_VERSION },
> + char get_firmware_version[] = { NVEC_CNTL, GET_FIRMWARE_VERSION },
> unmute_speakers[] = { NVEC_OEM0, 0x10, 0x59, 0x95 },
> enable_event[7] = { NVEC_SYS, CNF_EVENT_REPORTING, true };
>
> - if (!pdev->dev.of_node) {
> - dev_err(&pdev->dev, "must be instantiated using device tree\n");
> +
> + if (!client->dev.of_node) {
> + dev_err(&client->dev, "must be instantiated using device tree\n");
> return -ENODEV;
> }
>
> - nvec = devm_kzalloc(&pdev->dev, sizeof(struct nvec_chip), GFP_KERNEL);
> + nvec = devm_kzalloc(&client->dev, sizeof(struct nvec_chip), GFP_KERNEL);
> if (nvec == NULL)
> return -ENOMEM;
>
> - platform_set_drvdata(pdev, nvec);
> - nvec->dev = &pdev->dev;
> + nvec->dev = &client->dev;
> + ret = nvec_i2c_parse_dt(nvec);
> + if (ret < 0)
> + return ret;
>
> - err = nvec_i2c_parse_dt_pdata(nvec);
> - if (err < 0)
> - return err;
> + i2c_set_clientdata(client, nvec);
>
> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - base = devm_ioremap_resource(&pdev->dev, res);
> - if (IS_ERR(base))
> - return PTR_ERR(base);
> -
> - nvec->irq = platform_get_irq(pdev, 0);
> - if (nvec->irq < 0) {
> - dev_err(&pdev->dev, "no irq resource?\n");
> - return -ENODEV;
> - }
> -
> - i2c_clk = devm_clk_get(&pdev->dev, "div-clk");
> - if (IS_ERR(i2c_clk)) {
> - dev_err(nvec->dev, "failed to get controller clock\n");
> - return -ENODEV;
> - }
> -
> - nvec->rst = devm_reset_control_get(&pdev->dev, "i2c");
> - if (IS_ERR(nvec->rst)) {
> - dev_err(nvec->dev, "failed to get controller reset\n");
> - return PTR_ERR(nvec->rst);
> - }
> + ret = i2c_slave_register(client, nvec_slave_cb);
> + if (ret < 0)
> + return ret;
>
> - nvec->base = base;
> - nvec->i2c_clk = i2c_clk;
> nvec->rx = &nvec->msg_pool[0];
>
> ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list);
> @@ -852,23 +707,14 @@ static int tegra_nvec_probe(struct platform_device
> *pdev) INIT_WORK(&nvec->rx_work, nvec_dispatch);
> INIT_WORK(&nvec->tx_work, nvec_request_master);
>
> - err = devm_gpio_request_one(&pdev->dev, nvec->gpio, GPIOF_OUT_INIT_HIGH,
> - "nvec gpio");
> - if (err < 0) {
> + ret = devm_gpio_request_one(&client->dev, nvec->gpio,
> + GPIOF_OUT_INIT_HIGH,
> + "nvec gpio");
> + if (ret < 0) {
> dev_err(nvec->dev, "couldn't request gpio\n");
> return -ENODEV;
> }
>
> - err = devm_request_irq(&pdev->dev, nvec->irq, nvec_interrupt, 0,
> - "nvec", nvec);
> - if (err) {
> - dev_err(nvec->dev, "couldn't request irq\n");
> - return -ENODEV;
> - }
> - disable_irq(nvec->irq);
> -
> - tegra_init_i2c_slave(nvec);
> -
> /* enable event reporting */
> nvec_toggle_global_events(nvec, true);
>
> @@ -907,12 +753,13 @@ static int tegra_nvec_probe(struct platform_device
> *pdev) return 0;
> }
>
> -static int tegra_nvec_remove(struct platform_device *pdev)
> +
> +static int nvec_remove(struct i2c_client *client)
> {
> - struct nvec_chip *nvec = platform_get_drvdata(pdev);
> + struct nvec_chip *nvec = i2c_get_clientdata(client);
>
> nvec_toggle_global_events(nvec, false);
> - mfd_remove_devices(nvec->dev);
> + /* TODO: mfd_remove_devices(nvec->dev); ??? */

why did you removed this?

> nvec_unregister_notifier(nvec, &nvec->nvec_status_notifier);
> cancel_work_sync(&nvec->rx_work);
> cancel_work_sync(&nvec->tx_work);
> @@ -938,8 +785,6 @@ static int nvec_suspend(struct device *dev)
> msg = nvec_write_sync(nvec, ap_suspend, sizeof(ap_suspend));
> nvec_msg_free(nvec, msg);
>
> - nvec_disable_i2c_slave(nvec);
> -
> return 0;
> }
>
> @@ -949,7 +794,6 @@ static int nvec_resume(struct device *dev)
> struct nvec_chip *nvec = platform_get_drvdata(pdev);
>
> dev_dbg(nvec->dev, "resuming\n");
> - tegra_init_i2c_slave(nvec);
> nvec_toggle_global_events(nvec, true);
>
> return 0;
> @@ -965,9 +809,16 @@ static const struct of_device_id nvidia_nvec_of_match[]
> = { };
> MODULE_DEVICE_TABLE(of, nvidia_nvec_of_match);
>
> -static struct platform_driver nvec_device_driver = {
> - .probe = tegra_nvec_probe,
> - .remove = tegra_nvec_remove,
> +static const struct i2c_device_id nvidia_nvec_i2c_table[] = {
> + { "nvec", 0 },
> + {},
> +};
> +MODULE_DEVICE_TABLE(i2c, nvidia_nvec_i2c_table);
> +
> +static struct i2c_driver i2c_nvec_device_driver = {
> + .probe = nvec_probe,
> + .remove = nvec_remove,
> + .id_table = nvidia_nvec_i2c_table,
> .driver = {
> .name = "nvec",
> .pm = &nvec_pm_ops,
> @@ -975,9 +826,9 @@ static struct platform_driver nvec_device_driver = {
> }
> };
>
> -module_platform_driver(nvec_device_driver);
> +module_i2c_driver(i2c_nvec_device_driver);
>
> -MODULE_ALIAS("platform:nvec");
> +MODULE_ALIAS("i2c:nvec");
> MODULE_DESCRIPTION("NVIDIA compliant embedded controller interface");
> MODULE_AUTHOR("Marc Dietrich <marvin24@xxxxxx>");
> MODULE_LICENSE("GPL");
> diff --git a/drivers/staging/nvec/nvec.h b/drivers/staging/nvec/nvec.h
> index e271375..5e7e17c 100644
> --- a/drivers/staging/nvec/nvec.h
> +++ b/drivers/staging/nvec/nvec.h
> @@ -56,6 +56,13 @@ enum nvec_event_size {
> NVEC_VAR_SIZE,
> };
>
> +enum nvec_state {
> + ST_NONE,
> + ST_RX,
> + ST_TX,
> + ST_TRANS_START,
> +};
> +
> /**
> * enum nvec_msg_type - The type of a message
> * @NVEC_SYS: A system request/response
> @@ -107,11 +114,6 @@ struct nvec_msg {
> * struct nvec_chip - A single connection to an NVIDIA Embedded controller
> * @dev: The device
> * @gpio: The same as for &struct nvec_platform_data
> - * @irq: The IRQ of the I2C device
> - * @i2c_addr: The address of the I2C slave
> - * @base: The base of the memory mapped region of the I2C device
> - * @i2c_clk: The clock of the I2C device
> - * @rst: The reset of the I2C device
> * @notifier_list: Notifiers to be called on received messages, see
> * nvec_register_notifier()
> * @rx_data: Received messages that have to be processed
> @@ -137,11 +139,6 @@ struct nvec_msg {
> struct nvec_chip {
> struct device *dev;
> int gpio;
> - int irq;
> - int i2c_addr;
> - void __iomem *base;
> - struct clk *i2c_clk;
> - struct reset_control *rst;
> struct atomic_notifier_head notifier_list;
> struct list_head rx_data, tx_data;
> struct notifier_block nvec_status_notifier;

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