From 706865afe54eee83c1f3d7e9ea2f51db8e986d7b Mon Sep 17 00:00:00 2001
From: Stefan Roese
Date: Mon, 20 Mar 2017 12:51:48 +0100
Subject: dm: core: Add flags parameter to device_remove()

This patch adds the flags parameter to device_remove() and changes all
calls to this function to provide the default value of DM_REMOVE_NORMAL
for "normal" device removal.

This is in preparation for the driver specific pre-OS (e.g. DMA
cancelling) remove support.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
---
 arch/x86/cpu/queensbay/tnc.c   |  4 ++--
 cmd/cros_ec.c                  |  2 +-
 cmd/sf.c                       |  2 +-
 drivers/block/blk-uclass.c     |  2 +-
 drivers/block/sandbox.c        |  2 +-
 drivers/core/device-remove.c   |  9 +++++----
 drivers/core/device.c          |  2 +-
 drivers/core/root.c            |  2 +-
 drivers/core/uclass.c          |  2 +-
 drivers/mmc/mmc-uclass.c       |  2 +-
 drivers/mtd/spi/sandbox.c      |  2 +-
 drivers/mtd/spi/sf-uclass.c    |  2 +-
 drivers/spi/spi-uclass.c       |  4 ++--
 drivers/usb/emul/sandbox_hub.c |  2 +-
 drivers/usb/host/usb-uclass.c  |  4 ++--
 include/dm/device-internal.h   |  5 +++--
 include/dm/device.h            | 26 ++++++++++++++++++++++++++
 test/dm/bus.c                  |  8 ++++----
 test/dm/core.c                 | 16 ++++++++--------
 test/dm/eth.c                  |  2 +-
 test/dm/spi.c                  |  2 +-
 21 files changed, 65 insertions(+), 37 deletions(-)

diff --git a/arch/x86/cpu/queensbay/tnc.c b/arch/x86/cpu/queensbay/tnc.c
index f307c622c88..94668a4fda1 100644
--- a/arch/x86/cpu/queensbay/tnc.c
+++ b/arch/x86/cpu/queensbay/tnc.c
@@ -76,13 +76,13 @@ static int __maybe_unused disable_igd(void)
 	 *
 	 * So the only option we have is to manually remove these two devices.
 	 */
-	ret = device_remove(igd);
+	ret = device_remove(igd, DM_REMOVE_NORMAL);
 	if (ret)
 		return ret;
 	ret = device_unbind(igd);
 	if (ret)
 		return ret;
-	ret = device_remove(sdvo);
+	ret = device_remove(sdvo, DM_REMOVE_NORMAL);
 	if (ret)
 		return ret;
 	ret = device_unbind(sdvo);
diff --git a/cmd/cros_ec.c b/cmd/cros_ec.c
index 9d42f870dc9..af0b4eee783 100644
--- a/cmd/cros_ec.c
+++ b/cmd/cros_ec.c
@@ -110,7 +110,7 @@ static int do_cros_ec(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		/* Remove any existing device */
 		ret = uclass_find_device(UCLASS_CROS_EC, 0, &udev);
 		if (!ret)
-			device_remove(udev);
+			device_remove(udev, DM_REMOVE_NORMAL);
 		ret = uclass_get_device(UCLASS_CROS_EC, 0, &udev);
 		if (ret) {
 			printf("Could not init cros_ec device (err %d)\n", ret);
diff --git a/cmd/sf.c b/cmd/sf.c
index 65b117feee2..f971eec781c 100644
--- a/cmd/sf.c
+++ b/cmd/sf.c
@@ -124,7 +124,7 @@ static int do_spi_flash_probe(int argc, char * const argv[])
 	/* Remove the old device, otherwise probe will just be a nop */
 	ret = spi_find_bus_and_cs(bus, cs, &bus_dev, &new);
 	if (!ret) {
-		device_remove(new);
+		device_remove(new, DM_REMOVE_NORMAL);
 	}
 	flash = NULL;
 	ret = spi_flash_probe_bus_cs(bus, cs, speed, mode, &new);
diff --git a/drivers/block/blk-uclass.c b/drivers/block/blk-uclass.c
index 38cb9388da6..af3c35f6d0b 100644
--- a/drivers/block/blk-uclass.c
+++ b/drivers/block/blk-uclass.c
@@ -530,7 +530,7 @@ int blk_unbind_all(int if_type)
 		struct blk_desc *desc = dev_get_uclass_platdata(dev);
 
 		if (desc->if_type == if_type) {
-			ret = device_remove(dev);
+			ret = device_remove(dev, DM_REMOVE_NORMAL);
 			if (ret)
 				return ret;
 			ret = device_unbind(dev);
diff --git a/drivers/block/sandbox.c b/drivers/block/sandbox.c
index 36c2ff30075..34d1c638bc7 100644
--- a/drivers/block/sandbox.c
+++ b/drivers/block/sandbox.c
@@ -98,7 +98,7 @@ int host_dev_bind(int devnum, char *filename)
 	/* Remove and unbind the old device, if any */
 	ret = blk_get_device(IF_TYPE_HOST, devnum, &dev);
 	if (ret == 0) {
-		ret = device_remove(dev);
+		ret = device_remove(dev, DM_REMOVE_NORMAL);
 		if (ret)
 			return ret;
 		ret = device_unbind(dev);
diff --git a/drivers/core/device-remove.c b/drivers/core/device-remove.c
index a7f77b4a21d..b80bf52320e 100644
--- a/drivers/core/device-remove.c
+++ b/drivers/core/device-remove.c
@@ -46,9 +46,10 @@ static int device_chld_unbind(struct udevice *dev)
 /**
  * device_chld_remove() - Stop all device's children
  * @dev:	The device whose children are to be removed
+ * @pre_os_remove: Flag, if this functions is called in the pre-OS stage
  * @return 0 on success, -ve on error
  */
-static int device_chld_remove(struct udevice *dev)
+static int device_chld_remove(struct udevice *dev, uint flags)
 {
 	struct udevice *pos, *n;
 	int ret;
@@ -56,7 +57,7 @@ static int device_chld_remove(struct udevice *dev)
 	assert(dev);
 
 	list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
-		ret = device_remove(pos);
+		ret = device_remove(pos, flags);
 		if (ret)
 			return ret;
 	}
@@ -151,7 +152,7 @@ void device_free(struct udevice *dev)
 	devres_release_probe(dev);
 }
 
-int device_remove(struct udevice *dev)
+int device_remove(struct udevice *dev, uint flags)
 {
 	const struct driver *drv;
 	int ret;
@@ -169,7 +170,7 @@ int device_remove(struct udevice *dev)
 	if (ret)
 		return ret;
 
-	ret = device_chld_remove(dev);
+	ret = device_chld_remove(dev, flags);
 	if (ret)
 		goto err;
 
diff --git a/drivers/core/device.c b/drivers/core/device.c
index 70fcfc23e0c..e1b0ebffc55 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -378,7 +378,7 @@ int device_probe(struct udevice *dev)
 
 	return 0;
 fail_uclass:
-	if (device_remove(dev)) {
+	if (device_remove(dev, DM_REMOVE_NORMAL)) {
 		dm_warn("%s: Device '%s' failed to remove on error path\n",
 			__func__, dev->name);
 	}
diff --git a/drivers/core/root.c b/drivers/core/root.c
index 33cfde6a5c3..d8c51fb496f 100644
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -178,7 +178,7 @@ int dm_init(void)
 
 int dm_uninit(void)
 {
-	device_remove(dm_root());
+	device_remove(dm_root(), DM_REMOVE_NORMAL);
 	device_unbind(dm_root());
 
 	return 0;
diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index 7de370644d7..d94d43a98d2 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -116,7 +116,7 @@ int uclass_destroy(struct uclass *uc)
 	while (!list_empty(&uc->dev_head)) {
 		dev = list_first_entry(&uc->dev_head, struct udevice,
 				       uclass_node);
-		ret = device_remove(dev);
+		ret = device_remove(dev, DM_REMOVE_NORMAL);
 		if (ret)
 			return ret;
 		ret = device_unbind(dev);
diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
index 5bb446bcc2a..9c07871d3a2 100644
--- a/drivers/mmc/mmc-uclass.c
+++ b/drivers/mmc/mmc-uclass.c
@@ -232,7 +232,7 @@ int mmc_unbind(struct udevice *dev)
 
 	device_find_first_child(dev, &bdev);
 	if (bdev) {
-		device_remove(bdev);
+		device_remove(bdev, DM_REMOVE_NORMAL);
 		device_unbind(bdev);
 	}
 
diff --git a/drivers/mtd/spi/sandbox.c b/drivers/mtd/spi/sandbox.c
index 36a50fe3a15..a53f4ebc68d 100644
--- a/drivers/mtd/spi/sandbox.c
+++ b/drivers/mtd/spi/sandbox.c
@@ -595,7 +595,7 @@ void sandbox_sf_unbind_emul(struct sandbox_state *state, int busnum, int cs)
 	struct udevice *dev;
 
 	dev = state->spi[busnum][cs].emul;
-	device_remove(dev);
+	device_remove(dev, DM_REMOVE_NORMAL);
 	device_unbind(dev);
 	state->spi[busnum][cs].emul = NULL;
 }
diff --git a/drivers/mtd/spi/sf-uclass.c b/drivers/mtd/spi/sf-uclass.c
index 19de964e612..83876485fed 100644
--- a/drivers/mtd/spi/sf-uclass.c
+++ b/drivers/mtd/spi/sf-uclass.c
@@ -46,7 +46,7 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 
 void spi_flash_free(struct spi_flash *flash)
 {
-	device_remove(flash->spi->dev);
+	device_remove(flash->spi->dev, DM_REMOVE_NORMAL);
 }
 
 int spi_flash_probe_bus_cs(unsigned int busnum, unsigned int cs,
diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c
index ac17da0777d..c061c05443d 100644
--- a/drivers/spi/spi-uclass.c
+++ b/drivers/spi/spi-uclass.c
@@ -343,7 +343,7 @@ err:
 	debug("%s: Error path, created=%d, device '%s'\n", __func__,
 	      created, dev->name);
 	if (created) {
-		device_remove(dev);
+		device_remove(dev, DM_REMOVE_NORMAL);
 		device_unbind(dev);
 	}
 
@@ -384,7 +384,7 @@ struct spi_slave *spi_setup_slave(unsigned int busnum, unsigned int cs,
 
 void spi_free_slave(struct spi_slave *slave)
 {
-	device_remove(slave->dev);
+	device_remove(slave->dev, DM_REMOVE_NORMAL);
 	slave->dev = NULL;
 }
 
diff --git a/drivers/usb/emul/sandbox_hub.c b/drivers/usb/emul/sandbox_hub.c
index c3a8e73389d..f0939b19f48 100644
--- a/drivers/usb/emul/sandbox_hub.c
+++ b/drivers/usb/emul/sandbox_hub.c
@@ -156,7 +156,7 @@ static int clrset_post_state(struct udevice *hub, int port, int clear, int set)
 			} else if (clear & USB_PORT_STAT_POWER) {
 				debug("%s: %s: power off, removed, ret=%d\n",
 				      __func__, dev->name, ret);
-				ret = device_remove(dev);
+				ret = device_remove(dev, DM_REMOVE_NORMAL);
 				clear |= USB_PORT_STAT_CONNECTION;
 			}
 		}
diff --git a/drivers/usb/host/usb-uclass.c b/drivers/usb/host/usb-uclass.c
index 5cf1e9a36cb..6eded4abad0 100644
--- a/drivers/usb/host/usb-uclass.c
+++ b/drivers/usb/host/usb-uclass.c
@@ -154,7 +154,7 @@ int usb_stop(void)
 	uc_priv = uc->priv;
 
 	uclass_foreach_dev(bus, uc) {
-		ret = device_remove(bus);
+		ret = device_remove(bus, DM_REMOVE_NORMAL);
 		if (ret && !err)
 			err = ret;
 	}
@@ -358,7 +358,7 @@ int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
 	ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
 	if (ret)
 		return ret;
-	ret = device_remove(dev);
+	ret = device_remove(dev, DM_REMOVE_NORMAL);
 	if (ret)
 		return ret;
 
diff --git a/include/dm/device-internal.h b/include/dm/device-internal.h
index 0bf8707493a..2cabc87338f 100644
--- a/include/dm/device-internal.h
+++ b/include/dm/device-internal.h
@@ -96,12 +96,13 @@ int device_probe(struct udevice *dev);
  * children are deactivated first.
  *
  * @dev: Pointer to device to remove
+ * @flags: Flags for selective device removal
  * @return 0 if OK, -ve on error (an error here is normally a very bad thing)
  */
 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
-int device_remove(struct udevice *dev);
+int device_remove(struct udevice *dev, uint flags);
 #else
-static inline int device_remove(struct udevice *dev) { return 0; }
+static inline int device_remove(struct udevice *dev, uint flags) { return 0; }
 #endif
 
 /**
diff --git a/include/dm/device.h b/include/dm/device.h
index 4e95fb7773d..079ec570030 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -46,6 +46,32 @@ struct driver_info;
 
 #define DM_FLAG_OF_PLATDATA		(1 << 8)
 
+/*
+ * Call driver remove function to stop currently active DMA transfers or
+ * give DMA buffers back to the HW / controller. This may be needed for
+ * some drivers to do some final stage cleanup before the OS is called
+ * (U-Boot exit)
+ */
+#define DM_FLAG_ACTIVE_DMA		(1 << 9)
+
+/*
+ * One or multiple of these flags are passed to device_remove() so that
+ * a selective device removal as specified by the remove-stage and the
+ * driver flags can be done.
+ */
+enum {
+	/* Normal remove, remove all devices */
+	DM_REMOVE_NORMAL     = 1 << 0,
+
+	/* Remove devices with active DMA */
+	DM_REMOVE_ACTIVE_DMA = DM_FLAG_ACTIVE_DMA,
+
+	/* Add more use cases here */
+
+	/* Remove devices with any active flag */
+	DM_REMOVE_ACTIVE_ALL = DM_REMOVE_ACTIVE_DMA,
+};
+
 /**
  * struct udevice - An instance of a driver
  *
diff --git a/test/dm/bus.c b/test/dm/bus.c
index d94dcf7a60d..6a2773565eb 100644
--- a/test/dm/bus.c
+++ b/test/dm/bus.c
@@ -222,7 +222,7 @@ static int test_bus_parent_data(struct unit_test_state *uts)
 	/* Check that it starts at 0 and goes away when device is removed */
 	parent_data->sum += 5;
 	ut_asserteq(5, parent_data->sum);
-	device_remove(dev);
+	device_remove(dev, DM_REMOVE_NORMAL);
 	ut_asserteq_ptr(NULL, dev_get_parent_priv(dev));
 
 	/* Check that we can do this twice */
@@ -323,7 +323,7 @@ static int dm_test_bus_parent_ops(struct unit_test_state *uts)
 			continue;
 		parent_data = dev_get_parent_priv(dev);
 		ut_asserteq(FLAG_CHILD_PROBED, parent_data->flag);
-		ut_assertok(device_remove(dev));
+		ut_assertok(device_remove(dev, DM_REMOVE_NORMAL));
 		ut_asserteq_ptr(NULL, dev_get_parent_priv(dev));
 		ut_asserteq_ptr(dms->removed, dev);
 	}
@@ -360,7 +360,7 @@ static int test_bus_parent_platdata(struct unit_test_state *uts)
 		plat->count++;
 		ut_asserteq(1, plat->count);
 		device_probe(dev);
-		device_remove(dev);
+		device_remove(dev, DM_REMOVE_NORMAL);
 
 		ut_asserteq_ptr(plat, dev_get_parent_platdata(dev));
 		ut_asserteq(1, plat->count);
@@ -370,7 +370,7 @@ static int test_bus_parent_platdata(struct unit_test_state *uts)
 	ut_asserteq(3, child_count);
 
 	/* Removing the bus should also have no effect (it is still bound) */
-	device_remove(bus);
+	device_remove(bus, DM_REMOVE_NORMAL);
 	for (device_find_first_child(bus, &dev), child_count = 0;
 	     dev;
 	     device_find_next_child(&dev)) {
diff --git a/test/dm/core.c b/test/dm/core.c
index 70bf4d0605a..07b2419ea4a 100644
--- a/test/dm/core.c
+++ b/test/dm/core.c
@@ -319,7 +319,7 @@ static int dm_test_lifecycle(struct unit_test_state *uts)
 
 	/* Now remove device 3 */
 	ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_PRE_REMOVE]);
-	ut_assertok(device_remove(dev));
+	ut_assertok(device_remove(dev, DM_REMOVE_NORMAL));
 	ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_PRE_REMOVE]);
 
 	ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_UNBIND]);
@@ -352,7 +352,7 @@ static int dm_test_ordering(struct unit_test_state *uts)
 	ut_assert(dev_last);
 
 	/* Now remove device 3 */
-	ut_assertok(device_remove(dev));
+	ut_assertok(device_remove(dev, DM_REMOVE_NORMAL));
 	ut_assertok(device_unbind(dev));
 
 	/* The device numbering should have shifted down one */
@@ -371,9 +371,9 @@ static int dm_test_ordering(struct unit_test_state *uts)
 	ut_assert(pingret == 102);
 
 	/* Remove 3 and 4 */
-	ut_assertok(device_remove(dev_penultimate));
+	ut_assertok(device_remove(dev_penultimate, DM_REMOVE_NORMAL));
 	ut_assertok(device_unbind(dev_penultimate));
-	ut_assertok(device_remove(dev_last));
+	ut_assertok(device_remove(dev_last, DM_REMOVE_NORMAL));
 	ut_assertok(device_unbind(dev_last));
 
 	/* Our device should now be in position 3 */
@@ -381,7 +381,7 @@ static int dm_test_ordering(struct unit_test_state *uts)
 	ut_assert(dev == test_dev);
 
 	/* Now remove device 3 */
-	ut_assertok(device_remove(dev));
+	ut_assertok(device_remove(dev, DM_REMOVE_NORMAL));
 	ut_assertok(device_unbind(dev));
 
 	return 0;
@@ -457,7 +457,7 @@ static int dm_test_remove(struct unit_test_state *uts)
 		ut_assert(dev);
 		ut_assertf(dev->flags & DM_FLAG_ACTIVATED,
 			   "Driver %d/%s not activated", i, dev->name);
-		ut_assertok(device_remove(dev));
+		ut_assertok(device_remove(dev, DM_REMOVE_NORMAL));
 		ut_assertf(!(dev->flags & DM_FLAG_ACTIVATED),
 			   "Driver %d/%s should have deactivated", i,
 			   dev->name);
@@ -611,14 +611,14 @@ static int dm_test_children(struct unit_test_state *uts)
 	ut_asserteq(total, dm_testdrv_op_count[DM_TEST_OP_PROBE]);
 
 	/* Remove a top-level child and check that the children are removed */
-	ut_assertok(device_remove(top[2]));
+	ut_assertok(device_remove(top[2], DM_REMOVE_NORMAL));
 	ut_asserteq(NODE_COUNT + 1, dm_testdrv_op_count[DM_TEST_OP_REMOVE]);
 	dm_testdrv_op_count[DM_TEST_OP_REMOVE] = 0;
 
 	/* Try one with grandchildren */
 	ut_assertok(uclass_get_device(UCLASS_TEST, 5, &dev));
 	ut_asserteq_ptr(dev, top[5]);
-	ut_assertok(device_remove(dev));
+	ut_assertok(device_remove(dev, DM_REMOVE_NORMAL));
 	ut_asserteq(1 + NODE_COUNT * (1 + NODE_COUNT),
 		    dm_testdrv_op_count[DM_TEST_OP_REMOVE]);
 
diff --git a/test/dm/eth.c b/test/dm/eth.c
index 6288ae24abb..564ad369160 100644
--- a/test/dm/eth.c
+++ b/test/dm/eth.c
@@ -116,7 +116,7 @@ static int dm_test_eth_act(struct unit_test_state *uts)
 	for (i = 0; i < DM_TEST_ETH_NUM; i++) {
 		ut_assertok(uclass_find_device_by_name(UCLASS_ETH,
 						       ethname[i], &dev[i]));
-		ut_assertok(device_remove(dev[i]));
+		ut_assertok(device_remove(dev[i], DM_REMOVE_NORMAL));
 
 		/* Invalidate MAC address */
 		strcpy(ethaddr[i], getenv(addrname[i]));
diff --git a/test/dm/spi.c b/test/dm/spi.c
index f52cb733c77..24fa2a48ae9 100644
--- a/test/dm/spi.c
+++ b/test/dm/spi.c
@@ -36,7 +36,7 @@ static int dm_test_spi_find(struct unit_test_state *uts)
 	ut_asserteq(0, uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus));
 	ut_assertok(spi_cs_info(bus, cs, &info));
 	of_offset = dev_of_offset(info.dev);
-	device_remove(info.dev);
+	device_remove(info.dev, DM_REMOVE_NORMAL);
 	device_unbind(info.dev);
 
 	/*
-- 
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