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Message-Id: <1427745615-5428-4-git-send-email-danindrey@mail.ru>
Date: Mon, 30 Mar 2015 23:00:14 +0300
From: Andrey Danin <danindrey@...l.ru>
To: devicetree@...r.kernel.org, linux-i2c@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org, ac100@...ts.launchpad.net
Cc: Andrey Danin <danindrey@...l.ru>,
Laxman Dewangan <ldewangan@...dia.com>,
Wolfram Sang <wsa@...-dreams.de>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Russell King <linux@....linux.org.uk>,
Stephen Warren <swarren@...dotorg.org>,
Thierry Reding <thierry.reding@...il.com>,
Alexandre Courbot <gnurou@...il.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Julian Andres Klode <jak@...-linux.org>,
Marc Dietrich <marvin24@....de>
Subject: [PATCH v2 3/4] staging/nvec: remove old code
Signed-off-by: Andrey Danin <danindrey@...l.ru>
---
Changes for v2:
- it is initial verion
---
drivers/staging/nvec/nvec.c | 211 --------------------------------------------
1 file changed, 211 deletions(-)
diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
index f4c5527..f39f516 100644
--- a/drivers/staging/nvec/nvec.c
+++ b/drivers/staging/nvec/nvec.c
@@ -516,23 +516,6 @@ static void nvec_rx_completed(struct nvec_chip *nvec)
schedule_work(&nvec->rx_work);
}
-#if 0
-/**
- * nvec_invalid_flags - Send an error message about invalid flags and jump
- * @nvec: The nvec device
- * @status: The status flags
- * @reset: Whether we shall jump to state 0.
- */
-static void nvec_invalid_flags(struct nvec_chip *nvec, unsigned int status,
- bool reset)
-{
- dev_err(nvec->dev, "unexpected status flags 0x%02x during state %i\n",
- status, nvec->state);
- if (reset)
- nvec->state = 0;
-}
-#endif /* FIXME: remove old code */
-
/**
* nvec_tx_set - Set the message to transfer (nvec->tx)
* @nvec: A &struct nvec_chip
@@ -562,200 +545,6 @@ static void nvec_tx_set(struct nvec_chip *nvec)
(uint)nvec->tx->size, nvec->tx->data[1]);
}
-
-#if 0
-/**
- * nvec_interrupt - Interrupt handler
- * @irq: The IRQ
- * @dev: The nvec device
- *
- * Interrupt handler that fills our RX buffers and empties our TX
- * buffers. This uses a finite state machine with ridiculous amounts
- * of error checking, in order to be fairly reliable.
- */
-static irqreturn_t nvec_interrupt(int irq, void *dev)
-{
- unsigned long status;
- unsigned int received = 0;
- unsigned char to_send = 0xff;
- const unsigned long irq_mask = I2C_SL_IRQ | END_TRANS | RCVD | RNW;
- struct nvec_chip *nvec = dev;
- unsigned int state = nvec->state;
-
- status = readl(nvec->base + I2C_SL_STATUS);
-
- /* Filter out some errors */
- if ((status & irq_mask) == 0 && (status & ~irq_mask) != 0) {
- dev_err(nvec->dev, "unexpected irq mask %lx\n", status);
- return IRQ_HANDLED;
- }
- if ((status & I2C_SL_IRQ) == 0) {
- dev_err(nvec->dev, "Spurious IRQ\n");
- return IRQ_HANDLED;
- }
-
- /* The EC did not request a read, so it send us something, read it */
- if ((status & RNW) == 0) {
- received = readl(nvec->base + I2C_SL_RCVD);
- if (status & RCVD)
- writel(0, nvec->base + I2C_SL_RCVD);
- }
-
- if (status == (I2C_SL_IRQ | RCVD))
- nvec->state = 0;
-
- switch (nvec->state) {
- case 0: /* Verify that its a transfer start, the rest later */
- if (status != (I2C_SL_IRQ | RCVD))
- nvec_invalid_flags(nvec, status, false);
- break;
- case 1: /* command byte */
- if (status != I2C_SL_IRQ) {
- nvec_invalid_flags(nvec, status, true);
- } else {
- nvec->rx = nvec_msg_alloc(nvec, NVEC_MSG_RX);
- /* Should not happen in a normal world */
- if (unlikely(nvec->rx == NULL)) {
- nvec->state = 0;
- break;
- }
- nvec->rx->data[0] = received;
- nvec->rx->pos = 1;
- nvec->state = 2;
- }
- break;
- case 2: /* first byte after command */
- if (status == (I2C_SL_IRQ | RNW | RCVD)) {
- udelay(33);
- if (nvec->rx->data[0] != 0x01) {
- dev_err(nvec->dev,
- "Read without prior read command\n");
- nvec->state = 0;
- break;
- }
- nvec_msg_free(nvec, nvec->rx);
- nvec->state = 3;
- nvec_tx_set(nvec);
- BUG_ON(nvec->tx->size < 1);
- to_send = nvec->tx->data[0];
- nvec->tx->pos = 1;
- } else if (status == (I2C_SL_IRQ)) {
- BUG_ON(nvec->rx == NULL);
- nvec->rx->data[1] = received;
- nvec->rx->pos = 2;
- nvec->state = 4;
- } else {
- nvec_invalid_flags(nvec, status, true);
- }
- break;
- case 3: /* EC does a block read, we transmit data */
- if (status & END_TRANS) {
- nvec_tx_completed(nvec);
- } else if ((status & RNW) == 0 || (status & RCVD)) {
- nvec_invalid_flags(nvec, status, true);
- } else if (nvec->tx && nvec->tx->pos < nvec->tx->size) {
- to_send = nvec->tx->data[nvec->tx->pos++];
- } else {
- dev_err(nvec->dev, "tx buffer underflow on %p (%u > %u)\n",
- nvec->tx,
- (uint) (nvec->tx ? nvec->tx->pos : 0),
- (uint) (nvec->tx ? nvec->tx->size : 0));
- nvec->state = 0;
- }
- break;
- case 4: /* EC does some write, we read the data */
- if ((status & (END_TRANS | RNW)) == END_TRANS)
- nvec_rx_completed(nvec);
- else if (status & (RNW | RCVD))
- nvec_invalid_flags(nvec, status, true);
- else if (nvec->rx && nvec->rx->pos < NVEC_MSG_SIZE)
- nvec->rx->data[nvec->rx->pos++] = received;
- else
- dev_err(nvec->dev,
- "RX buffer overflow on %p: Trying to write byte %u of %u\n",
- nvec->rx, nvec->rx ? nvec->rx->pos : 0,
- NVEC_MSG_SIZE);
- break;
- default:
- nvec->state = 0;
- }
-
- /* If we are told that a new transfer starts, verify it */
- if ((status & (RCVD | RNW)) == RCVD) {
- if (received != nvec->i2c_addr)
- dev_err(nvec->dev,
- "received address 0x%02x, expected 0x%02x\n",
- received, nvec->i2c_addr);
- nvec->state = 1;
- }
-
- /* Send data if requested, but not on end of transmission */
- if ((status & (RNW | END_TRANS)) == RNW)
- writel(to_send, nvec->base + I2C_SL_RCVD);
-
- /* If we have send the first byte */
- if (status == (I2C_SL_IRQ | RNW | RCVD))
- nvec_gpio_set_value(nvec, 1);
-
- dev_dbg(nvec->dev,
- "Handled: %s 0x%02x, %s 0x%02x in state %u [%s%s%s]\n",
- (status & RNW) == 0 ? "received" : "R=",
- received,
- (status & (RNW | END_TRANS)) ? "sent" : "S=",
- to_send,
- state,
- status & END_TRANS ? " END_TRANS" : "",
- status & RCVD ? " RCVD" : "",
- status & RNW ? " RNW" : "");
-
-
- /*
- * TODO: A correct fix needs to be found for this.
- *
- * We experience less incomplete messages with this delay than without
- * it, but we don't know why. Help is appreciated.
- */
- udelay(100);
-
- return IRQ_HANDLED;
-}
-
-static void tegra_init_i2c_slave(struct nvec_chip *nvec)
-{
- u32 val;
-
- clk_prepare_enable(nvec->i2c_clk);
-
- reset_control_assert(nvec->rst);
- udelay(2);
- reset_control_deassert(nvec->rst);
-
- val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN |
- (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT);
- writel(val, nvec->base + I2C_CNFG);
-
- clk_set_rate(nvec->i2c_clk, 8 * 80000);
-
- writel(I2C_SL_NEWSL, nvec->base + I2C_SL_CNFG);
- writel(0x1E, nvec->base + I2C_SL_DELAY_COUNT);
-
- writel(nvec->i2c_addr>>1, nvec->base + I2C_SL_ADDR1);
- writel(0, nvec->base + I2C_SL_ADDR2);
-
- enable_irq(nvec->irq);
-}
-
-#ifdef CONFIG_PM_SLEEP
-static void nvec_disable_i2c_slave(struct nvec_chip *nvec)
-{
- disable_irq(nvec->irq);
- writel(I2C_SL_NEWSL | I2C_SL_NACK, nvec->base + I2C_SL_CNFG);
- clk_disable_unprepare(nvec->i2c_clk);
-}
-#endif
-#endif /* FIXME: remove old code. */
-
-
/**
* nvec_slave_cb - I2C slave callback
*
--
1.9.1
--
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