mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 14:37:57 +00:00
68d9cb8214
Run tested: ath79, ipq40xx Build tested: ath79, ipq40xx Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
381 lines
8.3 KiB
Diff
381 lines
8.3 KiB
Diff
From: Russell King <rmk+kernel@armlinux.org.uk>
|
|
Bcc: linux@mail.armlinux.org.uk
|
|
Cc: linux-i2c@vger.kernel.org
|
|
Subject: [PATCH 04/17] i2c: pxa: re-arrange functions to flow better
|
|
MIME-Version: 1.0
|
|
Content-Disposition: inline
|
|
Content-Transfer-Encoding: 8bit
|
|
Content-Type: text/plain; charset="utf-8"
|
|
|
|
Re-arrange the PXA I2C code to avoid forward declarations, and keep
|
|
similar functionality (e.g. the non-IRQ mode support) together. This
|
|
improves code readability.
|
|
|
|
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
|
|
---
|
|
drivers/i2c/busses/i2c-pxa.c | 325 +++++++++++++++++------------------
|
|
1 file changed, 162 insertions(+), 163 deletions(-)
|
|
|
|
--- a/drivers/i2c/busses/i2c-pxa.c
|
|
+++ b/drivers/i2c/busses/i2c-pxa.c
|
|
@@ -326,7 +326,6 @@ static void i2c_pxa_scream_blue_murder(s
|
|
#endif /* ifdef DEBUG / else */
|
|
|
|
static void i2c_pxa_master_complete(struct pxa_i2c *i2c, int ret);
|
|
-static irqreturn_t i2c_pxa_handler(int this_irq, void *dev_id);
|
|
|
|
static inline int i2c_pxa_is_slavemode(struct pxa_i2c *i2c)
|
|
{
|
|
@@ -697,34 +696,6 @@ static inline void i2c_pxa_stop_message(
|
|
writel(icr, _ICR(i2c));
|
|
}
|
|
|
|
-static int i2c_pxa_pio_set_master(struct pxa_i2c *i2c)
|
|
-{
|
|
- /* make timeout the same as for interrupt based functions */
|
|
- long timeout = 2 * DEF_TIMEOUT;
|
|
-
|
|
- /*
|
|
- * Wait for the bus to become free.
|
|
- */
|
|
- while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) {
|
|
- udelay(1000);
|
|
- show_state(i2c);
|
|
- }
|
|
-
|
|
- if (timeout < 0) {
|
|
- show_state(i2c);
|
|
- dev_err(&i2c->adap.dev,
|
|
- "i2c_pxa: timeout waiting for bus free\n");
|
|
- return I2C_RETRY;
|
|
- }
|
|
-
|
|
- /*
|
|
- * Set master mode.
|
|
- */
|
|
- writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c));
|
|
-
|
|
- return 0;
|
|
-}
|
|
-
|
|
/*
|
|
* PXA I2C send master code
|
|
* 1. Load master code to IDBR and send it.
|
|
@@ -753,140 +724,6 @@ static int i2c_pxa_send_mastercode(struc
|
|
return (timeout == 0) ? I2C_RETRY : 0;
|
|
}
|
|
|
|
-static int i2c_pxa_do_pio_xfer(struct pxa_i2c *i2c,
|
|
- struct i2c_msg *msg, int num)
|
|
-{
|
|
- unsigned long timeout = 500000; /* 5 seconds */
|
|
- int ret = 0;
|
|
-
|
|
- ret = i2c_pxa_pio_set_master(i2c);
|
|
- if (ret)
|
|
- goto out;
|
|
-
|
|
- i2c->msg = msg;
|
|
- i2c->msg_num = num;
|
|
- i2c->msg_idx = 0;
|
|
- i2c->msg_ptr = 0;
|
|
- i2c->irqlogidx = 0;
|
|
-
|
|
- i2c_pxa_start_message(i2c);
|
|
-
|
|
- while (i2c->msg_num > 0 && --timeout) {
|
|
- i2c_pxa_handler(0, i2c);
|
|
- udelay(10);
|
|
- }
|
|
-
|
|
- i2c_pxa_stop_message(i2c);
|
|
-
|
|
- /*
|
|
- * We place the return code in i2c->msg_idx.
|
|
- */
|
|
- ret = i2c->msg_idx;
|
|
-
|
|
-out:
|
|
- if (timeout == 0) {
|
|
- i2c_pxa_scream_blue_murder(i2c, "timeout");
|
|
- ret = I2C_RETRY;
|
|
- }
|
|
-
|
|
- return ret;
|
|
-}
|
|
-
|
|
-/*
|
|
- * We are protected by the adapter bus mutex.
|
|
- */
|
|
-static int i2c_pxa_do_xfer(struct pxa_i2c *i2c, struct i2c_msg *msg, int num)
|
|
-{
|
|
- long timeout;
|
|
- int ret;
|
|
-
|
|
- /*
|
|
- * Wait for the bus to become free.
|
|
- */
|
|
- ret = i2c_pxa_wait_bus_not_busy(i2c);
|
|
- if (ret) {
|
|
- dev_err(&i2c->adap.dev, "i2c_pxa: timeout waiting for bus free\n");
|
|
- goto out;
|
|
- }
|
|
-
|
|
- /*
|
|
- * Set master mode.
|
|
- */
|
|
- ret = i2c_pxa_set_master(i2c);
|
|
- if (ret) {
|
|
- dev_err(&i2c->adap.dev, "i2c_pxa_set_master: error %d\n", ret);
|
|
- goto out;
|
|
- }
|
|
-
|
|
- if (i2c->high_mode) {
|
|
- ret = i2c_pxa_send_mastercode(i2c);
|
|
- if (ret) {
|
|
- dev_err(&i2c->adap.dev, "i2c_pxa_send_mastercode timeout\n");
|
|
- goto out;
|
|
- }
|
|
- }
|
|
-
|
|
- spin_lock_irq(&i2c->lock);
|
|
-
|
|
- i2c->msg = msg;
|
|
- i2c->msg_num = num;
|
|
- i2c->msg_idx = 0;
|
|
- i2c->msg_ptr = 0;
|
|
- i2c->irqlogidx = 0;
|
|
-
|
|
- i2c_pxa_start_message(i2c);
|
|
-
|
|
- spin_unlock_irq(&i2c->lock);
|
|
-
|
|
- /*
|
|
- * The rest of the processing occurs in the interrupt handler.
|
|
- */
|
|
- timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
|
|
- i2c_pxa_stop_message(i2c);
|
|
-
|
|
- /*
|
|
- * We place the return code in i2c->msg_idx.
|
|
- */
|
|
- ret = i2c->msg_idx;
|
|
-
|
|
- if (!timeout && i2c->msg_num) {
|
|
- i2c_pxa_scream_blue_murder(i2c, "timeout");
|
|
- ret = I2C_RETRY;
|
|
- }
|
|
-
|
|
- out:
|
|
- return ret;
|
|
-}
|
|
-
|
|
-static int i2c_pxa_pio_xfer(struct i2c_adapter *adap,
|
|
- struct i2c_msg msgs[], int num)
|
|
-{
|
|
- struct pxa_i2c *i2c = adap->algo_data;
|
|
- int ret, i;
|
|
-
|
|
- /* If the I2C controller is disabled we need to reset it
|
|
- (probably due to a suspend/resume destroying state). We do
|
|
- this here as we can then avoid worrying about resuming the
|
|
- controller before its users. */
|
|
- if (!(readl(_ICR(i2c)) & ICR_IUE))
|
|
- i2c_pxa_reset(i2c);
|
|
-
|
|
- for (i = adap->retries; i >= 0; i--) {
|
|
- ret = i2c_pxa_do_pio_xfer(i2c, msgs, num);
|
|
- if (ret != I2C_RETRY)
|
|
- goto out;
|
|
-
|
|
- if (i2c_debug)
|
|
- dev_dbg(&adap->dev, "Retrying transmission\n");
|
|
- udelay(100);
|
|
- }
|
|
- i2c_pxa_scream_blue_murder(i2c, "exhausted retries");
|
|
- ret = -EREMOTEIO;
|
|
- out:
|
|
- i2c_pxa_set_slave(i2c, ret);
|
|
- return ret;
|
|
-}
|
|
-
|
|
/*
|
|
* i2c_pxa_master_complete - complete the message and wake up.
|
|
*/
|
|
@@ -1093,6 +930,71 @@ static irqreturn_t i2c_pxa_handler(int t
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
+/*
|
|
+ * We are protected by the adapter bus mutex.
|
|
+ */
|
|
+static int i2c_pxa_do_xfer(struct pxa_i2c *i2c, struct i2c_msg *msg, int num)
|
|
+{
|
|
+ long timeout;
|
|
+ int ret;
|
|
+
|
|
+ /*
|
|
+ * Wait for the bus to become free.
|
|
+ */
|
|
+ ret = i2c_pxa_wait_bus_not_busy(i2c);
|
|
+ if (ret) {
|
|
+ dev_err(&i2c->adap.dev, "i2c_pxa: timeout waiting for bus free\n");
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * Set master mode.
|
|
+ */
|
|
+ ret = i2c_pxa_set_master(i2c);
|
|
+ if (ret) {
|
|
+ dev_err(&i2c->adap.dev, "i2c_pxa_set_master: error %d\n", ret);
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ if (i2c->high_mode) {
|
|
+ ret = i2c_pxa_send_mastercode(i2c);
|
|
+ if (ret) {
|
|
+ dev_err(&i2c->adap.dev, "i2c_pxa_send_mastercode timeout\n");
|
|
+ goto out;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ spin_lock_irq(&i2c->lock);
|
|
+
|
|
+ i2c->msg = msg;
|
|
+ i2c->msg_num = num;
|
|
+ i2c->msg_idx = 0;
|
|
+ i2c->msg_ptr = 0;
|
|
+ i2c->irqlogidx = 0;
|
|
+
|
|
+ i2c_pxa_start_message(i2c);
|
|
+
|
|
+ spin_unlock_irq(&i2c->lock);
|
|
+
|
|
+ /*
|
|
+ * The rest of the processing occurs in the interrupt handler.
|
|
+ */
|
|
+ timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
|
|
+ i2c_pxa_stop_message(i2c);
|
|
+
|
|
+ /*
|
|
+ * We place the return code in i2c->msg_idx.
|
|
+ */
|
|
+ ret = i2c->msg_idx;
|
|
+
|
|
+ if (!timeout && i2c->msg_num) {
|
|
+ i2c_pxa_scream_blue_murder(i2c, "timeout");
|
|
+ ret = I2C_RETRY;
|
|
+ }
|
|
+
|
|
+ out:
|
|
+ return ret;
|
|
+}
|
|
|
|
static int i2c_pxa_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
|
|
{
|
|
@@ -1126,6 +1028,103 @@ static const struct i2c_algorithm i2c_px
|
|
.functionality = i2c_pxa_functionality,
|
|
};
|
|
|
|
+/* Non-interrupt mode support */
|
|
+static int i2c_pxa_pio_set_master(struct pxa_i2c *i2c)
|
|
+{
|
|
+ /* make timeout the same as for interrupt based functions */
|
|
+ long timeout = 2 * DEF_TIMEOUT;
|
|
+
|
|
+ /*
|
|
+ * Wait for the bus to become free.
|
|
+ */
|
|
+ while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) {
|
|
+ udelay(1000);
|
|
+ show_state(i2c);
|
|
+ }
|
|
+
|
|
+ if (timeout < 0) {
|
|
+ show_state(i2c);
|
|
+ dev_err(&i2c->adap.dev,
|
|
+ "i2c_pxa: timeout waiting for bus free\n");
|
|
+ return I2C_RETRY;
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * Set master mode.
|
|
+ */
|
|
+ writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c));
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int i2c_pxa_do_pio_xfer(struct pxa_i2c *i2c,
|
|
+ struct i2c_msg *msg, int num)
|
|
+{
|
|
+ unsigned long timeout = 500000; /* 5 seconds */
|
|
+ int ret = 0;
|
|
+
|
|
+ ret = i2c_pxa_pio_set_master(i2c);
|
|
+ if (ret)
|
|
+ goto out;
|
|
+
|
|
+ i2c->msg = msg;
|
|
+ i2c->msg_num = num;
|
|
+ i2c->msg_idx = 0;
|
|
+ i2c->msg_ptr = 0;
|
|
+ i2c->irqlogidx = 0;
|
|
+
|
|
+ i2c_pxa_start_message(i2c);
|
|
+
|
|
+ while (i2c->msg_num > 0 && --timeout) {
|
|
+ i2c_pxa_handler(0, i2c);
|
|
+ udelay(10);
|
|
+ }
|
|
+
|
|
+ i2c_pxa_stop_message(i2c);
|
|
+
|
|
+ /*
|
|
+ * We place the return code in i2c->msg_idx.
|
|
+ */
|
|
+ ret = i2c->msg_idx;
|
|
+
|
|
+out:
|
|
+ if (timeout == 0) {
|
|
+ i2c_pxa_scream_blue_murder(i2c, "timeout");
|
|
+ ret = I2C_RETRY;
|
|
+ }
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int i2c_pxa_pio_xfer(struct i2c_adapter *adap,
|
|
+ struct i2c_msg msgs[], int num)
|
|
+{
|
|
+ struct pxa_i2c *i2c = adap->algo_data;
|
|
+ int ret, i;
|
|
+
|
|
+ /* If the I2C controller is disabled we need to reset it
|
|
+ (probably due to a suspend/resume destroying state). We do
|
|
+ this here as we can then avoid worrying about resuming the
|
|
+ controller before its users. */
|
|
+ if (!(readl(_ICR(i2c)) & ICR_IUE))
|
|
+ i2c_pxa_reset(i2c);
|
|
+
|
|
+ for (i = adap->retries; i >= 0; i--) {
|
|
+ ret = i2c_pxa_do_pio_xfer(i2c, msgs, num);
|
|
+ if (ret != I2C_RETRY)
|
|
+ goto out;
|
|
+
|
|
+ if (i2c_debug)
|
|
+ dev_dbg(&adap->dev, "Retrying transmission\n");
|
|
+ udelay(100);
|
|
+ }
|
|
+ i2c_pxa_scream_blue_murder(i2c, "exhausted retries");
|
|
+ ret = -EREMOTEIO;
|
|
+ out:
|
|
+ i2c_pxa_set_slave(i2c, ret);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
static const struct i2c_algorithm i2c_pxa_pio_algorithm = {
|
|
.master_xfer = i2c_pxa_pio_xfer,
|
|
.functionality = i2c_pxa_functionality,
|