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714199ec34
Add i2c-pxa updates queued for v5.8, which add bus recovery to this driver; this is needed for the uDPU platform. Signed-off-by: Russell King <linux@armlinux.org.uk>
386 lines
8.5 KiB
Diff
386 lines
8.5 KiB
Diff
From: Russell King <rmk+kernel@armlinux.org.uk>
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Bcc: linux@mail.armlinux.org.uk
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Cc: linux-i2c@vger.kernel.org
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Subject: [PATCH 04/17] i2c: pxa: re-arrange functions to flow better
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MIME-Version: 1.0
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Content-Disposition: inline
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Content-Transfer-Encoding: 8bit
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Content-Type: text/plain; charset="utf-8"
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Re-arrange the PXA I2C code to avoid forward declarations, and keep
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similar functionality (e.g. the non-IRQ mode support) together. This
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improves code readability.
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Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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---
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drivers/i2c/busses/i2c-pxa.c | 325 +++++++++++++++++------------------
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1 file changed, 162 insertions(+), 163 deletions(-)
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diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
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index ee83d2e46de0..e5f00ae39861 100644
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--- a/drivers/i2c/busses/i2c-pxa.c
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+++ b/drivers/i2c/busses/i2c-pxa.c
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@@ -327,7 +327,6 @@ static void i2c_pxa_scream_blue_murder(struct pxa_i2c *i2c, const char *why)
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#endif /* ifdef DEBUG / else */
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static void i2c_pxa_master_complete(struct pxa_i2c *i2c, int ret);
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-static irqreturn_t i2c_pxa_handler(int this_irq, void *dev_id);
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static inline int i2c_pxa_is_slavemode(struct pxa_i2c *i2c)
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{
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@@ -703,34 +702,6 @@ static inline void i2c_pxa_stop_message(struct pxa_i2c *i2c)
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writel(icr, _ICR(i2c));
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}
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-static int i2c_pxa_pio_set_master(struct pxa_i2c *i2c)
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-{
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- /* make timeout the same as for interrupt based functions */
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- long timeout = 2 * DEF_TIMEOUT;
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-
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- /*
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- * Wait for the bus to become free.
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- */
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- while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) {
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- udelay(1000);
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- show_state(i2c);
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- }
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-
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- if (timeout < 0) {
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- show_state(i2c);
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- dev_err(&i2c->adap.dev,
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- "i2c_pxa: timeout waiting for bus free\n");
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- return I2C_RETRY;
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- }
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-
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- /*
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- * Set master mode.
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- */
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- writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c));
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-
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- return 0;
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-}
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-
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/*
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* PXA I2C send master code
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* 1. Load master code to IDBR and send it.
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@@ -759,140 +730,6 @@ static int i2c_pxa_send_mastercode(struct pxa_i2c *i2c)
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return (timeout == 0) ? I2C_RETRY : 0;
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}
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-static int i2c_pxa_do_pio_xfer(struct pxa_i2c *i2c,
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- struct i2c_msg *msg, int num)
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-{
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- unsigned long timeout = 500000; /* 5 seconds */
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- int ret = 0;
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-
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- ret = i2c_pxa_pio_set_master(i2c);
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- if (ret)
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- goto out;
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-
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- i2c->msg = msg;
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- i2c->msg_num = num;
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- i2c->msg_idx = 0;
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- i2c->msg_ptr = 0;
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- i2c->irqlogidx = 0;
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-
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- i2c_pxa_start_message(i2c);
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-
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- while (i2c->msg_num > 0 && --timeout) {
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- i2c_pxa_handler(0, i2c);
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- udelay(10);
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- }
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-
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- i2c_pxa_stop_message(i2c);
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-
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- /*
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- * We place the return code in i2c->msg_idx.
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- */
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- ret = i2c->msg_idx;
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-
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-out:
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- if (timeout == 0) {
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- i2c_pxa_scream_blue_murder(i2c, "timeout");
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- ret = I2C_RETRY;
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- }
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-
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- return ret;
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-}
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-
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-/*
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- * We are protected by the adapter bus mutex.
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- */
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-static int i2c_pxa_do_xfer(struct pxa_i2c *i2c, struct i2c_msg *msg, int num)
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-{
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- long timeout;
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- int ret;
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-
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- /*
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- * Wait for the bus to become free.
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- */
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- ret = i2c_pxa_wait_bus_not_busy(i2c);
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- if (ret) {
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- dev_err(&i2c->adap.dev, "i2c_pxa: timeout waiting for bus free\n");
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- goto out;
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- }
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-
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- /*
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- * Set master mode.
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- */
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- ret = i2c_pxa_set_master(i2c);
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- if (ret) {
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- dev_err(&i2c->adap.dev, "i2c_pxa_set_master: error %d\n", ret);
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- goto out;
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- }
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-
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- if (i2c->high_mode) {
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- ret = i2c_pxa_send_mastercode(i2c);
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- if (ret) {
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- dev_err(&i2c->adap.dev, "i2c_pxa_send_mastercode timeout\n");
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- goto out;
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- }
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- }
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-
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- spin_lock_irq(&i2c->lock);
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-
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- i2c->msg = msg;
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- i2c->msg_num = num;
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- i2c->msg_idx = 0;
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- i2c->msg_ptr = 0;
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- i2c->irqlogidx = 0;
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-
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- i2c_pxa_start_message(i2c);
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-
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- spin_unlock_irq(&i2c->lock);
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-
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- /*
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- * The rest of the processing occurs in the interrupt handler.
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- */
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- timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
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- i2c_pxa_stop_message(i2c);
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-
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- /*
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- * We place the return code in i2c->msg_idx.
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- */
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- ret = i2c->msg_idx;
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-
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- if (!timeout && i2c->msg_num) {
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- i2c_pxa_scream_blue_murder(i2c, "timeout");
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- ret = I2C_RETRY;
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- }
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-
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- out:
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- return ret;
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-}
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-
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-static int i2c_pxa_pio_xfer(struct i2c_adapter *adap,
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- struct i2c_msg msgs[], int num)
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-{
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- struct pxa_i2c *i2c = adap->algo_data;
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- int ret, i;
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-
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- /* If the I2C controller is disabled we need to reset it
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- (probably due to a suspend/resume destroying state). We do
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- this here as we can then avoid worrying about resuming the
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- controller before its users. */
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- if (!(readl(_ICR(i2c)) & ICR_IUE))
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- i2c_pxa_reset(i2c);
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-
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- for (i = adap->retries; i >= 0; i--) {
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- ret = i2c_pxa_do_pio_xfer(i2c, msgs, num);
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- if (ret != I2C_RETRY)
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- goto out;
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-
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- if (i2c_debug)
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- dev_dbg(&adap->dev, "Retrying transmission\n");
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- udelay(100);
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- }
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- i2c_pxa_scream_blue_murder(i2c, "exhausted retries");
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- ret = -EREMOTEIO;
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- out:
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- i2c_pxa_set_slave(i2c, ret);
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- return ret;
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-}
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-
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/*
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* i2c_pxa_master_complete - complete the message and wake up.
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*/
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@@ -1099,6 +936,71 @@ static irqreturn_t i2c_pxa_handler(int this_irq, void *dev_id)
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return IRQ_HANDLED;
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}
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+/*
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+ * We are protected by the adapter bus mutex.
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+ */
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+static int i2c_pxa_do_xfer(struct pxa_i2c *i2c, struct i2c_msg *msg, int num)
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+{
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+ long timeout;
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+ int ret;
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+
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+ /*
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+ * Wait for the bus to become free.
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+ */
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+ ret = i2c_pxa_wait_bus_not_busy(i2c);
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+ if (ret) {
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+ dev_err(&i2c->adap.dev, "i2c_pxa: timeout waiting for bus free\n");
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+ goto out;
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+ }
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+
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+ /*
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+ * Set master mode.
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+ */
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+ ret = i2c_pxa_set_master(i2c);
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+ if (ret) {
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+ dev_err(&i2c->adap.dev, "i2c_pxa_set_master: error %d\n", ret);
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+ goto out;
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+ }
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+
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+ if (i2c->high_mode) {
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+ ret = i2c_pxa_send_mastercode(i2c);
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+ if (ret) {
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+ dev_err(&i2c->adap.dev, "i2c_pxa_send_mastercode timeout\n");
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+ goto out;
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+ }
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+ }
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+
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+ spin_lock_irq(&i2c->lock);
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+
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+ i2c->msg = msg;
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+ i2c->msg_num = num;
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+ i2c->msg_idx = 0;
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+ i2c->msg_ptr = 0;
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+ i2c->irqlogidx = 0;
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+
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+ i2c_pxa_start_message(i2c);
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+
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+ spin_unlock_irq(&i2c->lock);
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+
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+ /*
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+ * The rest of the processing occurs in the interrupt handler.
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+ */
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+ timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
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+ i2c_pxa_stop_message(i2c);
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+
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+ /*
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+ * We place the return code in i2c->msg_idx.
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+ */
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+ ret = i2c->msg_idx;
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+
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+ if (!timeout && i2c->msg_num) {
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+ i2c_pxa_scream_blue_murder(i2c, "timeout");
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+ ret = I2C_RETRY;
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+ }
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+
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+ out:
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+ return ret;
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+}
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static int i2c_pxa_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
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{
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@@ -1132,6 +1034,103 @@ static const struct i2c_algorithm i2c_pxa_algorithm = {
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.functionality = i2c_pxa_functionality,
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};
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+/* Non-interrupt mode support */
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+static int i2c_pxa_pio_set_master(struct pxa_i2c *i2c)
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+{
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+ /* make timeout the same as for interrupt based functions */
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+ long timeout = 2 * DEF_TIMEOUT;
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+
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+ /*
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+ * Wait for the bus to become free.
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+ */
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+ while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) {
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+ udelay(1000);
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+ show_state(i2c);
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+ }
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+
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+ if (timeout < 0) {
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+ show_state(i2c);
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+ dev_err(&i2c->adap.dev,
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+ "i2c_pxa: timeout waiting for bus free\n");
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+ return I2C_RETRY;
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+ }
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+
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+ /*
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+ * Set master mode.
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+ */
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+ writel(readl(_ICR(i2c)) | ICR_SCLE, _ICR(i2c));
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+
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+ return 0;
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+}
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+
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+static int i2c_pxa_do_pio_xfer(struct pxa_i2c *i2c,
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+ struct i2c_msg *msg, int num)
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+{
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+ unsigned long timeout = 500000; /* 5 seconds */
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+ int ret = 0;
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+
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+ ret = i2c_pxa_pio_set_master(i2c);
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+ if (ret)
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+ goto out;
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+
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+ i2c->msg = msg;
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+ i2c->msg_num = num;
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+ i2c->msg_idx = 0;
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+ i2c->msg_ptr = 0;
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+ i2c->irqlogidx = 0;
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+
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+ i2c_pxa_start_message(i2c);
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+
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+ while (i2c->msg_num > 0 && --timeout) {
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+ i2c_pxa_handler(0, i2c);
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+ udelay(10);
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+ }
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+
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+ i2c_pxa_stop_message(i2c);
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+
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+ /*
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+ * We place the return code in i2c->msg_idx.
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+ */
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+ ret = i2c->msg_idx;
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+
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+out:
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+ if (timeout == 0) {
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+ i2c_pxa_scream_blue_murder(i2c, "timeout");
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+ ret = I2C_RETRY;
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+ }
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+
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+ return ret;
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+}
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+
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+static int i2c_pxa_pio_xfer(struct i2c_adapter *adap,
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+ struct i2c_msg msgs[], int num)
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+{
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+ struct pxa_i2c *i2c = adap->algo_data;
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+ int ret, i;
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+
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+ /* If the I2C controller is disabled we need to reset it
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+ (probably due to a suspend/resume destroying state). We do
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+ this here as we can then avoid worrying about resuming the
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+ controller before its users. */
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+ if (!(readl(_ICR(i2c)) & ICR_IUE))
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+ i2c_pxa_reset(i2c);
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+
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+ for (i = adap->retries; i >= 0; i--) {
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+ ret = i2c_pxa_do_pio_xfer(i2c, msgs, num);
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+ if (ret != I2C_RETRY)
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+ goto out;
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+
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+ if (i2c_debug)
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+ dev_dbg(&adap->dev, "Retrying transmission\n");
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+ udelay(100);
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+ }
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+ i2c_pxa_scream_blue_murder(i2c, "exhausted retries");
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+ ret = -EREMOTEIO;
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+ out:
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+ i2c_pxa_set_slave(i2c, ret);
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+ return ret;
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+}
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+
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static const struct i2c_algorithm i2c_pxa_pio_algorithm = {
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.master_xfer = i2c_pxa_pio_xfer,
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.functionality = i2c_pxa_functionality,
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--
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2.20.1
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