[PATCH v5 36/36] i2c: tegra: Improve tegra_i2c_dev structure

Dmitry Osipenko
2020-09-06T18:53:14Z

Rename, reorder and change type of a few members of the tegra_i2c_dev
structure in order to improve readability of the code and have consistent
typing of the variables.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/i2c/busses/i2c-tegra.c | 94 ++++++++++++++++++----------------
1 file changed, 50 insertions(+), 44 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 880fbcd28c5e..10372c582aed 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -246,45 +246,52 @@ struct tegra_i2c_hw_feature {
* @msg_buf_remaining: size of unsent data in the message buffer
* @msg_read: indicates read direction of a transfer
* @bus_clk_rate: current I2C bus clock rate
- * @is_multimaster_mode: indicates that I2C controller is in multi-master mode
+ * @multimaster_mode: indicates that I2C controller is in multi-master mode
* @tx_dma_chan: DMA transmit channel
* @rx_dma_chan: DMA receive channel
* @dma_phys: handle to DMA resources
* @dma_buf: pointer to allocated DMA buffer
* @dma_buf_size: DMA buffer size
- * @is_curr_dma_xfer: indicates active DMA transfer
+ * @dma_mode: indicates active DMA transfer
* @dma_complete: DMA completion notifier
- * @is_curr_atomic_xfer: indicates active atomic transfer
+ * @atomic_mode: indicates active atomic transfer
*/
struct tegra_i2c_dev {
struct device *dev;
- const struct tegra_i2c_hw_feature *hw;
struct i2c_adapter adapter;
- struct clk *div_clk;
- struct clk_bulk_data *clocks;
- unsigned int nclocks;
+
+ const struct tegra_i2c_hw_feature *hw;
struct reset_control *rst;
- void __iomem *base;
+ unsigned int cont_id;
+ unsigned int irq;
+
phys_addr_t base_phys;
- int cont_id;
- int irq;
- int is_dvc;
- bool is_vi;
+ void __iomem *base;
+
+ struct clk_bulk_data *clocks;
+ unsigned int nclocks;
+
+ struct clk *div_clk;
+ unsigned int bus_clk_rate;
+
struct completion msg_complete;
+ size_t msg_buf_remaining;
int msg_err;
u8 *msg_buf;
- size_t msg_buf_remaining;
- int msg_read;
- u32 bus_clk_rate;
- bool is_multimaster_mode;
+
+ struct completion dma_complete;
struct dma_chan *tx_dma_chan;
struct dma_chan *rx_dma_chan;
+ size_t dma_buf_size;
dma_addr_t dma_phys;
u32 *dma_buf;
- unsigned int dma_buf_size;
- bool is_curr_dma_xfer;
- struct completion dma_complete;
- bool is_curr_atomic_xfer;
+
+ bool multimaster_mode;
+ bool atomic_mode;
+ bool msg_read;
+ bool dma_mode;
+ bool is_dvc;
+ bool is_vi;
};

static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val, u32 reg)
@@ -523,7 +530,7 @@ static int tegra_i2c_poll_register(struct tegra_i2c_dev *i2c_dev,
void __iomem *addr = i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg);
u32 val;

- if (!i2c_dev->is_curr_atomic_xfer)
+ if (!i2c_dev->atomic_mode)
return readl_relaxed_poll_timeout(addr, val, !(val & mask),
delay_us, timeout_us);

@@ -663,7 +670,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
if (err)
return err;

- if (i2c_dev->is_multimaster_mode && i2c_dev->hw->has_slcg_override_reg)
+ if (i2c_dev->multimaster_mode && i2c_dev->hw->has_slcg_override_reg)
i2c_writel(i2c_dev, I2C_MST_CORE_CLKEN_OVR, I2C_CLKEN_OVERRIDE);

err = tegra_i2c_wait_for_config_load(i2c_dev);
@@ -854,7 +861,7 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
if (i2c_dev->hw->supports_bus_clear && (status & I2C_INT_BUS_CLR_DONE))
goto err;

- if (!i2c_dev->is_curr_dma_xfer) {
+ if (!i2c_dev->dma_mode) {
if (i2c_dev->msg_read && (status & I2C_INT_RX_FIFO_DATA_REQ)) {
if (tegra_i2c_empty_rx_fifo(i2c_dev)) {
/*
@@ -889,7 +896,7 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
* so forcing msg_buf_remaining to 0 in DMA mode.
*/
if (status & I2C_INT_PACKET_XFER_COMPLETE) {
- if (i2c_dev->is_curr_dma_xfer)
+ if (i2c_dev->dma_mode)
i2c_dev->msg_buf_remaining = 0;
/*
* Underflow error condition: XFER_COMPLETE before message
@@ -919,7 +926,7 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
if (i2c_dev->is_dvc)
dvc_writel(i2c_dev, DVC_STATUS_I2C_DONE_INTR, DVC_STATUS);

- if (i2c_dev->is_curr_dma_xfer) {
+ if (i2c_dev->dma_mode) {
if (i2c_dev->msg_read)
dmaengine_terminate_async(i2c_dev->rx_dma_chan);
else
@@ -945,7 +952,7 @@ static int tegra_i2c_config_fifo_trig(struct tegra_i2c_dev *i2c_dev, size_t len)
else
reg = I2C_FIFO_CONTROL;

- if (i2c_dev->is_curr_dma_xfer) {
+ if (i2c_dev->dma_mode) {
if (len & 0xF)
dma_burst = 1;
else if (len & 0x10)
@@ -1031,7 +1038,7 @@ static unsigned long tegra_i2c_wait_completion(struct tegra_i2c_dev *i2c_dev,
{
unsigned long ret;

- if (i2c_dev->is_curr_atomic_xfer) {
+ if (i2c_dev->atomic_mode) {
ret = tegra_i2c_poll_completion(i2c_dev, complete, timeout_ms);
} else {
enable_irq(i2c_dev->irq);
@@ -1107,14 +1114,14 @@ static void tegra_i2c_push_packet_header(struct tegra_i2c_dev *i2c_dev,
FIELD_PREP(PACKET_HEADER0_CONT_ID, i2c_dev->cont_id) |
FIELD_PREP(PACKET_HEADER0_PACKET_ID, 1);

- if (i2c_dev->is_curr_dma_xfer && !i2c_dev->msg_read)
+ if (i2c_dev->dma_mode && !i2c_dev->msg_read)
*dma_buf++ = packet_header;
else
i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);

packet_header = msg->len - 1;

- if (i2c_dev->is_curr_dma_xfer && !i2c_dev->msg_read)
+ if (i2c_dev->dma_mode && !i2c_dev->msg_read)
*dma_buf++ = packet_header;
else
i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);
@@ -1139,7 +1146,7 @@ static void tegra_i2c_push_packet_header(struct tegra_i2c_dev *i2c_dev,
if (msg->flags & I2C_M_RD)
packet_header |= I2C_HEADER_READ;

- if (i2c_dev->is_curr_dma_xfer && !i2c_dev->msg_read)
+ if (i2c_dev->dma_mode && !i2c_dev->msg_read)
*dma_buf++ = packet_header;
else
i2c_writel(i2c_dev, packet_header, I2C_TX_FIFO);
@@ -1155,7 +1162,7 @@ static int tegra_i2c_error_recover(struct tegra_i2c_dev *i2c_dev,

/* start recovery upon arbitration loss in single master mode */
if (i2c_dev->msg_err == I2C_ERR_ARBITRATION_LOST) {
- if (!i2c_dev->is_multimaster_mode)
+ if (!i2c_dev->multimaster_mode)
return i2c_recover_bus(&i2c_dev->adapter);

return -EAGAIN;
@@ -1197,9 +1204,8 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,

xfer_size = ALIGN(xfer_size, BYTES_PER_FIFO_WORD);

- i2c_dev->is_curr_dma_xfer = (xfer_size > I2C_PIO_MODE_PREFERRED_LEN) &&
- i2c_dev->dma_buf &&
- !i2c_dev->is_curr_atomic_xfer;
+ i2c_dev->dma_mode = xfer_size > I2C_PIO_MODE_PREFERRED_LEN &&
+ i2c_dev->dma_buf && !i2c_dev->atomic_mode;

err = tegra_i2c_config_fifo_trig(i2c_dev, xfer_size);
if (err)
@@ -1215,7 +1221,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
int_mask = I2C_INT_NO_ACK | I2C_INT_ARBITRATION_LOST;
tegra_i2c_unmask_irq(i2c_dev, int_mask);

- if (i2c_dev->is_curr_dma_xfer) {
+ if (i2c_dev->dma_mode) {
if (i2c_dev->msg_read) {
dma_sync_single_for_device(i2c_dev->dev,
i2c_dev->dma_phys,
@@ -1234,7 +1240,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
tegra_i2c_push_packet_header(i2c_dev, msg, end_state);

if (!i2c_dev->msg_read) {
- if (i2c_dev->is_curr_dma_xfer) {
+ if (i2c_dev->dma_mode) {
memcpy(i2c_dev->dma_buf, msg->buf, msg->len);

dma_sync_single_for_device(i2c_dev->dev,
@@ -1252,7 +1258,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
if (i2c_dev->hw->has_per_pkt_xfer_complete_irq)
int_mask |= I2C_INT_PACKET_XFER_COMPLETE;

- if (!i2c_dev->is_curr_dma_xfer) {
+ if (!i2c_dev->dma_mode) {
if (msg->flags & I2C_M_RD)
int_mask |= I2C_INT_RX_FIFO_DATA_REQ;
else if (i2c_dev->msg_buf_remaining)
@@ -1263,7 +1269,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
dev_dbg(i2c_dev->dev, "unmasked IRQ: %02x\n",
i2c_readl(i2c_dev, I2C_INT_MASK));

- if (i2c_dev->is_curr_dma_xfer) {
+ if (i2c_dev->dma_mode) {
time_left = tegra_i2c_wait_completion(i2c_dev,
&i2c_dev->dma_complete,
xfer_time);
@@ -1311,7 +1317,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
time_left, completion_done(&i2c_dev->msg_complete),
i2c_dev->msg_err);

- i2c_dev->is_curr_dma_xfer = false;
+ i2c_dev->dma_mode = false;

err = tegra_i2c_error_recover(i2c_dev, msg);
if (err)
@@ -1363,9 +1369,9 @@ static int tegra_i2c_xfer_atomic(struct i2c_adapter *adap,
struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
int ret;

- i2c_dev->is_curr_atomic_xfer = true;
+ i2c_dev->atomic_mode = true;
ret = tegra_i2c_xfer(adap, msgs, num);
- i2c_dev->is_curr_atomic_xfer = false;
+ i2c_dev->atomic_mode = false;

return ret;
}
@@ -1598,7 +1604,7 @@ static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev)
i2c_dev->bus_clk_rate = I2C_MAX_STANDARD_MODE_FREQ;

multi_mode = of_property_read_bool(np, "multi-master");
- i2c_dev->is_multimaster_mode = multi_mode;
+ i2c_dev->multimaster_mode = multi_mode;

if (of_device_is_compatible(np, "nvidia,tegra20-i2c-dvc"))
i2c_dev->is_dvc = true;
@@ -1629,7 +1635,7 @@ static int tegra_i2c_init_clocks(struct tegra_i2c_dev *i2c_dev)
}
}

- if (!i2c_dev->is_multimaster_mode)
+ if (!i2c_dev->multimaster_mode)
return 0;

err = clk_enable(i2c_dev->div_clk);
@@ -1648,7 +1654,7 @@ static int tegra_i2c_init_clocks(struct tegra_i2c_dev *i2c_dev)

static void tegra_i2c_release_clocks(struct tegra_i2c_dev *i2c_dev)
{
- if (i2c_dev->is_multimaster_mode)
+ if (i2c_dev->multimaster_mode)
clk_disable(i2c_dev->div_clk);

clk_bulk_unprepare(i2c_dev->nclocks, i2c_dev->clocks);
--
2.27.0