rapidio/tsi721: add shutdown notification callback

Add device driver specific shutdown notification callback.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 48 insertions, 0 deletions

diff --git a/drivers/rapidio/devices/tsi721.c b/drivers/rapidio/devices/tsi721.c
index cd40f0f9fbfe..1fc9663ae3b5 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 d675a44ffc17..ce2fb1193869 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 500e1e044c36..b490ec36f018 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;