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Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang: "A set of updates and bugfixes for the new designware-baytrail driver. And a documentation bugfix" * 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: i2c: imx: add required clocks property to binding i2c: designware-baytrail: baytrail_i2c_acquire() might sleep i2c: designware-baytrail: cross-check lock functions i2c: designware-baytrail: fix sparse warnings i2c: designware-baytrail: fix typo in error path i2c: designware-baytrail: describe magic numbers
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2cf3afcd4c
@ -7,6 +7,7 @@ Required properties:
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- "fsl,vf610-i2c" for I2C compatible with the one integrated on Vybrid vf610 SoC
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- reg : Should contain I2C/HS-I2C registers location and length
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- interrupts : Should contain I2C/HS-I2C interrupt
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- clocks : Should contain the I2C/HS-I2C clock specifier
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Optional properties:
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- clock-frequency : Constains desired I2C/HS-I2C bus clock frequency in Hz.
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@ -17,27 +17,31 @@
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#include <linux/acpi.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <asm/iosf_mbi.h>
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#include "i2c-designware-core.h"
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#define SEMAPHORE_TIMEOUT 100
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#define PUNIT_SEMAPHORE 0x7
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#define PUNIT_SEMAPHORE_BIT BIT(0)
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#define PUNIT_SEMAPHORE_ACQUIRE BIT(1)
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static unsigned long acquired;
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static int get_sem(struct device *dev, u32 *sem)
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{
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u32 reg_val;
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u32 data;
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int ret;
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ret = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ, PUNIT_SEMAPHORE,
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®_val);
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&data);
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if (ret) {
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dev_err(dev, "iosf failed to read punit semaphore\n");
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return ret;
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}
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*sem = reg_val & 0x1;
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*sem = data & PUNIT_SEMAPHORE_BIT;
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return 0;
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}
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@ -52,27 +56,29 @@ static void reset_semaphore(struct device *dev)
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return;
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}
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data = data & 0xfffffffe;
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data &= ~PUNIT_SEMAPHORE_BIT;
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if (iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
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PUNIT_SEMAPHORE, data))
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PUNIT_SEMAPHORE, data))
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dev_err(dev, "iosf failed to reset punit semaphore during write\n");
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}
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int baytrail_i2c_acquire(struct dw_i2c_dev *dev)
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static int baytrail_i2c_acquire(struct dw_i2c_dev *dev)
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{
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u32 sem = 0;
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u32 sem;
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int ret;
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unsigned long start, end;
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might_sleep();
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if (!dev || !dev->dev)
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return -ENODEV;
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if (!dev->acquire_lock)
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if (!dev->release_lock)
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return 0;
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/* host driver writes 0x2 to side band semaphore register */
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/* host driver writes to side band semaphore register */
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ret = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
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PUNIT_SEMAPHORE, 0x2);
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PUNIT_SEMAPHORE, PUNIT_SEMAPHORE_ACQUIRE);
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if (ret) {
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dev_err(dev->dev, "iosf punit semaphore request failed\n");
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return ret;
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@ -81,7 +87,7 @@ int baytrail_i2c_acquire(struct dw_i2c_dev *dev)
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/* host driver waits for bit 0 to be set in semaphore register */
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start = jiffies;
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end = start + msecs_to_jiffies(SEMAPHORE_TIMEOUT);
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while (!time_after(jiffies, end)) {
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do {
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ret = get_sem(dev->dev, &sem);
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if (!ret && sem) {
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acquired = jiffies;
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@ -91,14 +97,14 @@ int baytrail_i2c_acquire(struct dw_i2c_dev *dev)
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}
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usleep_range(1000, 2000);
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}
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} while (time_before(jiffies, end));
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dev_err(dev->dev, "punit semaphore timed out, resetting\n");
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reset_semaphore(dev->dev);
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ret = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
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PUNIT_SEMAPHORE, &sem);
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if (!ret)
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PUNIT_SEMAPHORE, &sem);
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if (ret)
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dev_err(dev->dev, "iosf failed to read punit semaphore\n");
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else
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dev_err(dev->dev, "PUNIT SEM: %d\n", sem);
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@ -107,9 +113,8 @@ int baytrail_i2c_acquire(struct dw_i2c_dev *dev)
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return -ETIMEDOUT;
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}
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EXPORT_SYMBOL(baytrail_i2c_acquire);
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void baytrail_i2c_release(struct dw_i2c_dev *dev)
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static void baytrail_i2c_release(struct dw_i2c_dev *dev)
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{
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if (!dev || !dev->dev)
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return;
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@ -121,7 +126,6 @@ void baytrail_i2c_release(struct dw_i2c_dev *dev)
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dev_dbg(dev->dev, "punit semaphore held for %ums\n",
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jiffies_to_msecs(jiffies - acquired));
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}
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EXPORT_SYMBOL(baytrail_i2c_release);
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int i2c_dw_eval_lock_support(struct dw_i2c_dev *dev)
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{
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@ -137,7 +141,6 @@ int i2c_dw_eval_lock_support(struct dw_i2c_dev *dev)
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return 0;
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status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
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if (ACPI_FAILURE(status))
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return 0;
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@ -153,7 +156,6 @@ int i2c_dw_eval_lock_support(struct dw_i2c_dev *dev)
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return 0;
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}
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EXPORT_SYMBOL(i2c_dw_eval_lock_support);
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MODULE_AUTHOR("David E. Box <david.e.box@linux.intel.com>");
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MODULE_DESCRIPTION("Baytrail I2C Semaphore driver");
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