[PATCH 10/30] rapidio/tsi721: add shutdown notification callback

[Alexandre Bounine]

Add device driver specific shutdown notification callback.

Signed-off-by: Alexandre Bounine <alexandre.boun...@idt.com>
Cc: Matt Porter <mpor...@kernel.crashing.org>
Cc: Aurelien Jacquiot <a-jacqu...@ti.com>
Cc: Andre van Herk <andre.van.h...@prodrive-technologies.com>
Cc: linux-kernel@vger.kernel.org
---
 drivers/rapidio/devices/tsi721.c     |   15 +++++++++++++++
 drivers/rapidio/devices/tsi721.h     |    3 +++
 drivers/rapidio/devices/tsi721_dma.c |   30 ++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+), 0 deletions(-)

diff --git a/drivers/rapidio/devices/tsi721.c b/drivers/rapidio/devices/tsi721.c
index cd40f0f..1fc9663 100644
--- a/drivers/rapidio/devices/tsi721.c
+++ b/drivers/rapidio/devices/tsi721.c
@@ -2638,6 +2638,8 @@ static int tsi721_probe(struct pci_dev *pdev,
        if (err)
                goto err_free_consistent;
 
+       pci_set_drvdata(pdev, priv);
+
        return 0;
 
 err_free_consistent:
@@ -2660,6 +2662,18 @@ err_exit:
        return err;
 }
 
+static void tsi721_shutdown(struct pci_dev *pdev)
+{
+       struct tsi721_device *priv = pci_get_drvdata(pdev);
+
+       dev_dbg(&pdev->dev, "RIO: %s\n", __func__);
+
+       tsi721_disable_ints(priv);
+       tsi721_dma_stop_all(priv);
+       pci_clear_master(pdev);
+       pci_disable_device(pdev);
+}
+
 static const struct pci_device_id tsi721_pci_tbl[] = {
        { PCI_DEVICE(PCI_VENDOR_ID_IDT, PCI_DEVICE_ID_TSI721) },
        { 0, }  /* terminate list */
@@ -2671,6 +2685,7 @@ static struct pci_driver tsi721_driver = {
        .name           = "tsi721",
        .id_table       = tsi721_pci_tbl,
        .probe          = tsi721_probe,
+       .shutdown       = tsi721_shutdown,
 };
 
 static int __init tsi721_init(void)
diff --git a/drivers/rapidio/devices/tsi721.h b/drivers/rapidio/devices/tsi721.h
index d675a44..ce2fb11 100644
--- a/drivers/rapidio/devices/tsi721.h
+++ b/drivers/rapidio/devices/tsi721.h
@@ -866,6 +866,9 @@ struct tsi721_device {
 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
 extern void tsi721_bdma_handler(struct tsi721_bdma_chan *bdma_chan);
 extern int tsi721_register_dma(struct tsi721_device *priv);
+extern void tsi721_dma_stop_all(struct tsi721_device *priv);
+#else
+#define tsi721_dma_stop_all(priv) do {} while (0)
 #endif
 
 #endif
diff --git a/drivers/rapidio/devices/tsi721_dma.c 
b/drivers/rapidio/devices/tsi721_dma.c
index 500e1e0..b490ec3 100644
--- a/drivers/rapidio/devices/tsi721_dma.c
+++ b/drivers/rapidio/devices/tsi721_dma.c
@@ -852,6 +852,36 @@ static int tsi721_terminate_all(struct dma_chan *dchan)
        return 0;
 }
 
+static void tsi721_dma_stop(struct tsi721_bdma_chan *bdma_chan)
+{
+       if (!bdma_chan->active)
+               return;
+       spin_lock_bh(&bdma_chan->lock);
+       if (!tsi721_dma_is_idle(bdma_chan)) {
+               int timeout = 100000;
+
+               /* stop the transfer in progress */
+               iowrite32(TSI721_DMAC_CTL_SUSP,
+                         bdma_chan->regs + TSI721_DMAC_CTL);
+
+               /* Wait until DMA channel stops */
+               while (!tsi721_dma_is_idle(bdma_chan) && --timeout)
+                       udelay(1);
+       }
+
+       spin_unlock_bh(&bdma_chan->lock);
+}
+
+void tsi721_dma_stop_all(struct tsi721_device *priv)
+{
+       int i;
+
+       for (i = 0; i < TSI721_DMA_MAXCH; i++) {
+               if (i != TSI721_DMACH_MAINT)
+                       tsi721_dma_stop(&priv->bdma[i]);
+       }
+}
+
 int tsi721_register_dma(struct tsi721_device *priv)
 {
        int i;
-- 
1.7.8.4