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Merge branch 'i2c/for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

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Pull i2c updates from Wolfram Sang:
 "Here is the I2C pull request for 4.8:

   - the core and i801 driver gained support for SMBus Host Notify

   - core support for more than one address in DT

   - i2c_add_adapter() has now better error messages.  We can remove all
     error messages from drivers calling it as a next step.

   - bigger updates to rk3x driver to support rk3399 SoC

   - the at24 eeprom driver got refactored and can now read special
     variants with unique serials or fixed MAC addresses.

  The rest is regular driver updates and bugfixes"

* 'i2c/for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (66 commits)
  i2c: i801: use IS_ENABLED() instead of checking for built-in or module
  Documentation: i2c: slave: give proper example for pm usage
  Documentation: i2c: slave: describe buffer problems a bit better
  i2c: bcm2835: Don't complain on -EPROBE_DEFER from getting our clock
  i2c: i2c-smbus: drop useless stubs
  i2c: efm32: fix a failure path in efm32_i2c_probe()
  Revert "i2c: core: Cleanup I2C ACPI namespace"
  Revert "i2c: core: Add function for finding the bus speed from ACPI"
  i2c: Update the description of I2C_SMBUS
  i2c: i2c-smbus: fix i2c_handle_smbus_host_notify documentation
  eeprom: at24: tweak the loop_until_timeout() macro
  eeprom: at24: add support for at24mac series
  eeprom: at24: support reading the serial number for 24csxx
  eeprom: at24: platform_data: use BIT() macro
  eeprom: at24: split at24_eeprom_write() into specialized functions
  eeprom: at24: split at24_eeprom_read() into specialized functions
  eeprom: at24: hide the read/write loop behind a macro
  eeprom: at24: call read/write functions via function pointers
  eeprom: at24: coding style fixes
  eeprom: at24: move at24_read() below at24_eeprom_write()
  ...
This commit is contained in:
Linus Torvalds
2016-07-27 14:19:25 -07:00
부모 7ae0ae4a02 175c7080f2
커밋 66304207cd
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157
drivers/i2c/busses/i2c-qup.c
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@@ -213,14 +213,16 @@ static irqreturn_t qup_i2c_interrupt(int irq, void *dev)
bus_err &= I2C_STATUS_ERROR_MASK;
qup_err &= QUP_STATUS_ERROR_FLAGS;
if (qup_err) {
/* Clear Error interrupt */
/* Clear the error bits in QUP_ERROR_FLAGS */
if (qup_err)
writel(qup_err, qup->base + QUP_ERROR_FLAGS);
goto done;
}
if (bus_err) {
/* Clear Error interrupt */
/* Clear the error bits in QUP_I2C_STATUS */
if (bus_err)
writel(bus_err, qup->base + QUP_I2C_STATUS);
/* Reset the QUP State in case of error */
if (qup_err || bus_err) {
writel(QUP_RESET_STATE, qup->base + QUP_STATE);
goto done;
}
@@ -310,6 +312,7 @@ static int qup_i2c_wait_ready(struct qup_i2c_dev *qup, int op, bool val,
u32 opflags;
u32 status;
u32 shift = __ffs(op);
int ret = 0;
len *= qup->one_byte_t;
/* timeout after a wait of twice the max time */
@@ -321,18 +324,28 @@ static int qup_i2c_wait_ready(struct qup_i2c_dev *qup, int op, bool val,
if (((opflags & op) >> shift) == val) {
if ((op == QUP_OUT_NOT_EMPTY) && qup->is_last) {
if (!(status & I2C_STATUS_BUS_ACTIVE))
return 0;
if (!(status & I2C_STATUS_BUS_ACTIVE)) {
ret = 0;
goto done;
}
} else {
return 0;
ret = 0;
goto done;
}
}
if (time_after(jiffies, timeout))
return -ETIMEDOUT;
if (time_after(jiffies, timeout)) {
ret = -ETIMEDOUT;
goto done;
}
usleep_range(len, len * 2);
}
done:
if (qup->bus_err || qup->qup_err)
ret = (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
return ret;
}
static void qup_i2c_set_write_mode_v2(struct qup_i2c_dev *qup,
@@ -585,8 +598,8 @@ static void qup_i2c_bam_cb(void *data)
}
static int qup_sg_set_buf(struct scatterlist *sg, void *buf,
struct qup_i2c_tag *tg, unsigned int buflen,
struct qup_i2c_dev *qup, int map, int dir)
unsigned int buflen, struct qup_i2c_dev *qup,
int dir)
{
int ret;
@@ -595,9 +608,6 @@ static int qup_sg_set_buf(struct scatterlist *sg, void *buf,
if (!ret)
return -EINVAL;
if (!map)
sg_dma_address(sg) = tg->addr + ((u8 *)buf - tg->start);
return 0;
}
@@ -649,37 +659,37 @@ static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
u8 *tags;
while (idx < num) {
blocks = (msg->len + limit) / limit;
rem = msg->len % limit;
tx_len = 0, len = 0, i = 0;
qup->is_last = (idx == (num - 1));
qup_i2c_set_blk_data(qup, msg);
blocks = qup->blk.count;
rem = msg->len - (blocks - 1) * limit;
if (msg->flags & I2C_M_RD) {
rx_nents += (blocks * 2) + 1;
tx_nents += 1;
while (qup->blk.pos < blocks) {
/* length set to '0' implies 256 bytes */
tlen = (i == (blocks - 1)) ? rem : 0;
tlen = (i == (blocks - 1)) ? rem : limit;
tags = &qup->start_tag.start[off + len];
len += qup_i2c_set_tags(tags, qup, msg, 1);
qup->blk.data_len -= tlen;
/* scratch buf to read the start and len tags */
ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
&qup->brx.tag.start[0],
&qup->brx.tag,
2, qup, 0, 0);
2, qup, DMA_FROM_DEVICE);
if (ret)
return ret;
ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
&msg->buf[limit * i],
NULL, tlen, qup,
1, DMA_FROM_DEVICE);
tlen, qup,
DMA_FROM_DEVICE);
if (ret)
return ret;
@@ -688,7 +698,7 @@ static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
}
ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
&qup->start_tag.start[off],
&qup->start_tag, len, qup, 0, 0);
len, qup, DMA_TO_DEVICE);
if (ret)
return ret;
@@ -696,30 +706,28 @@ static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
/* scratch buf to read the BAM EOT and FLUSH tags */
ret = qup_sg_set_buf(&qup->brx.sg[rx_buf++],
&qup->brx.tag.start[0],
&qup->brx.tag, 2,
qup, 0, 0);
2, qup, DMA_FROM_DEVICE);
if (ret)
return ret;
} else {
tx_nents += (blocks * 2);
while (qup->blk.pos < blocks) {
tlen = (i == (blocks - 1)) ? rem : 0;
tlen = (i == (blocks - 1)) ? rem : limit;
tags = &qup->start_tag.start[off + tx_len];
len = qup_i2c_set_tags(tags, qup, msg, 1);
qup->blk.data_len -= tlen;
ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
tags,
&qup->start_tag, len,
qup, 0, 0);
tags, len,
qup, DMA_TO_DEVICE);
if (ret)
return ret;
tx_len += len;
ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
&msg->buf[limit * i],
NULL, tlen, qup, 1,
DMA_TO_DEVICE);
tlen, qup, DMA_TO_DEVICE);
if (ret)
return ret;
i++;
@@ -738,8 +746,7 @@ static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
QUP_BAM_FLUSH_STOP;
ret = qup_sg_set_buf(&qup->btx.sg[tx_buf++],
&qup->btx.tag.start[0],
&qup->btx.tag, len,
qup, 0, 0);
len, qup, DMA_TO_DEVICE);
if (ret)
return ret;
tx_nents += 1;
@@ -801,39 +808,35 @@ static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
}
if (ret || qup->bus_err || qup->qup_err) {
if (qup->bus_err & QUP_I2C_NACK_FLAG) {
msg--;
dev_err(qup->dev, "NACK from %x\n", msg->addr);
ret = -EIO;
if (qup_i2c_change_state(qup, QUP_RUN_STATE)) {
dev_err(qup->dev, "change to run state timed out");
goto desc_err;
}
if (qup_i2c_change_state(qup, QUP_RUN_STATE)) {
dev_err(qup->dev, "change to run state timed out");
return ret;
}
if (rx_nents)
writel(QUP_BAM_INPUT_EOT,
qup->base + QUP_OUT_FIFO_BASE);
writel(QUP_BAM_FLUSH_STOP,
if (rx_nents)
writel(QUP_BAM_INPUT_EOT,
qup->base + QUP_OUT_FIFO_BASE);
qup_i2c_flush(qup);
writel(QUP_BAM_FLUSH_STOP, qup->base + QUP_OUT_FIFO_BASE);
/* wait for remaining interrupts to occur */
if (!wait_for_completion_timeout(&qup->xfer, HZ))
dev_err(qup->dev, "flush timed out\n");
qup_i2c_flush(qup);
qup_i2c_rel_dma(qup);
}
/* wait for remaining interrupts to occur */
if (!wait_for_completion_timeout(&qup->xfer, HZ))
dev_err(qup->dev, "flush timed out\n");
qup_i2c_rel_dma(qup);
ret = (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
}
desc_err:
dma_unmap_sg(qup->dev, qup->btx.sg, tx_nents, DMA_TO_DEVICE);
if (rx_nents)
dma_unmap_sg(qup->dev, qup->brx.sg, rx_nents,
DMA_FROM_DEVICE);
desc_err:
return ret;
}
@@ -849,9 +852,6 @@ static int qup_i2c_bam_xfer(struct i2c_adapter *adap, struct i2c_msg *msg,
if (ret)
goto out;
qup->bus_err = 0;
qup->qup_err = 0;
writel(0, qup->base + QUP_MX_INPUT_CNT);
writel(0, qup->base + QUP_MX_OUTPUT_CNT);
@@ -889,12 +889,8 @@ static int qup_i2c_wait_for_complete(struct qup_i2c_dev *qup,
ret = -ETIMEDOUT;
}
if (qup->bus_err || qup->qup_err) {
if (qup->bus_err & QUP_I2C_NACK_FLAG) {
dev_err(qup->dev, "NACK from %x\n", msg->addr);
ret = -EIO;
}
}
if (qup->bus_err || qup->qup_err)
ret = (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
return ret;
}
@@ -1020,7 +1016,7 @@ static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
u32 addr, len, val;
addr = (msg->addr << 1) | 1;
addr = i2c_8bit_addr_from_msg(msg);
/* 0 is used to specify a length 256 (QUP_READ_LIMIT) */
len = (msg->len == QUP_READ_LIMIT) ? 0 : msg->len;
@@ -1186,6 +1182,9 @@ static int qup_i2c_xfer(struct i2c_adapter *adap,
if (ret < 0)
goto out;
qup->bus_err = 0;
qup->qup_err = 0;
writel(1, qup->base + QUP_SW_RESET);
ret = qup_i2c_poll_state(qup, QUP_RESET_STATE);
if (ret)
@@ -1235,6 +1234,9 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
int ret, len, idx = 0, use_dma = 0;
qup->bus_err = 0;
qup->qup_err = 0;
ret = pm_runtime_get_sync(qup->dev);
if (ret < 0)
goto out;
@@ -1409,27 +1411,21 @@ static int qup_i2c_probe(struct platform_device *pdev)
/* 2 tag bytes for each block + 5 for start, stop tags */
size = blocks * 2 + 5;
qup->dpool = dma_pool_create("qup_i2c-dma-pool", &pdev->dev,
size, 4, 0);
qup->start_tag.start = dma_pool_alloc(qup->dpool, GFP_KERNEL,
&qup->start_tag.addr);
qup->start_tag.start = devm_kzalloc(&pdev->dev,
size, GFP_KERNEL);
if (!qup->start_tag.start) {
ret = -ENOMEM;
goto fail_dma;
}
qup->brx.tag.start = dma_pool_alloc(qup->dpool,
GFP_KERNEL,
&qup->brx.tag.addr);
qup->brx.tag.start = devm_kzalloc(&pdev->dev, 2, GFP_KERNEL);
if (!qup->brx.tag.start) {
ret = -ENOMEM;
goto fail_dma;
}
qup->btx.tag.start = dma_pool_alloc(qup->dpool,
GFP_KERNEL,
&qup->btx.tag.addr);
qup->btx.tag.start = devm_kzalloc(&pdev->dev, 2, GFP_KERNEL);
if (!qup->btx.tag.start) {
ret = -ENOMEM;
goto fail_dma;
@@ -1568,13 +1564,6 @@ static int qup_i2c_remove(struct platform_device *pdev)
struct qup_i2c_dev *qup = platform_get_drvdata(pdev);
if (qup->is_dma) {
dma_pool_free(qup->dpool, qup->start_tag.start,
qup->start_tag.addr);
dma_pool_free(qup->dpool, qup->brx.tag.start,
qup->brx.tag.addr);
dma_pool_free(qup->dpool, qup->btx.tag.start,
qup->btx.tag.addr);
dma_pool_destroy(qup->dpool);
dma_release_channel(qup->btx.dma);
dma_release_channel(qup->brx.dma);
}