dm: Add support for scsi/sata based devices

All sata based drivers are bind and corresponding block
device is created. Based on this find_scsi_device() is able
to get back block device based on scsi_curr_dev pointer.

intr_scsi() is commented now but it can be replaced by calling
find_scsi_device() and scsi_scan().

scsi_dev_desc[] is commented out but common/scsi.c heavily depends on
it. That's why CONFIG_SYS_SCSI_MAX_DEVICE is hardcoded to 1 and symbol
is reassigned to a block description allocated by uclass.
There is only one block description by device now but it doesn't need to
be correct when more devices are present.

scsi_bind() ensures corresponding block device creation.
uclass post_probe (scsi_post_probe()) is doing low level init.

SCSI/SATA DM based drivers requires to have 64bit base address as
the first entry in platform data structure to setup mmio_base.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

5 files changed, 64 insertions, 9 deletions

diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index fe5aa07..7b82ba6 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -19,6 +19,15 @@ config AHCI
 	  operations at present. The block device interface has not been converted
 	  to driver model.
 
+config DM_SCSI
+	bool "Support SCSI controllers with driver model"
+	depends on BLK
+	help
+	  This option enables the SCSI (Small Computer System Interface) uclass
+	  which supports SCSI and SATA HDDs. For every device configuration
+	  (IDs/LUNs) a block device is created with RAW read/write and
+	  filesystem support.
+
 config BLOCK_CACHE
 	bool "Use block device cache"
 	default n
@@ -27,3 +36,7 @@ config BLOCK_CACHE
 	  This is most useful when accessing filesystems under U-Boot since
 	  it will prevent repeated reads from directory structures and other
 	  filesystem data structures.
+
+menu "SATA/SCSI device support"
+
+endmenu
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 436b79f..a72feec 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -12,6 +12,7 @@ obj-y += blk_legacy.o
 endif
 
 obj-$(CONFIG_AHCI) += ahci-uclass.o
+obj-$(CONFIG_DM_SCSI) += scsi-uclass.o
 obj-$(CONFIG_SCSI_AHCI) += ahci.o
 obj-$(CONFIG_DWC_AHSATA) += dwc_ahsata.o
 obj-$(CONFIG_FSL_SATA) += fsl_sata.o
diff --git a/drivers/block/ahci.c b/drivers/block/ahci.c
index 5139989..3fa14a7 100644
--- a/drivers/block/ahci.c
+++ b/drivers/block/ahci.c
@@ -168,7 +168,7 @@ int ahci_reset(void __iomem *base)
 
 static int ahci_host_init(struct ahci_probe_ent *probe_ent)
 {
-#ifndef CONFIG_SCSI_AHCI_PLAT
+#if !defined(CONFIG_SCSI_AHCI_PLAT) && !defined(CONFIG_DM_SCSI)
 # ifdef CONFIG_DM_PCI
 	struct udevice *dev = probe_ent->dev;
 	struct pci_child_platdata *pplat = dev_get_parent_platdata(dev);
@@ -198,7 +198,7 @@ static int ahci_host_init(struct ahci_probe_ent *probe_ent)
 	writel(cap_save, mmio + HOST_CAP);
 	writel_with_flush(0xf, mmio + HOST_PORTS_IMPL);
 
-#ifndef CONFIG_SCSI_AHCI_PLAT
+#if !defined(CONFIG_SCSI_AHCI_PLAT) && !defined(CONFIG_DM_SCSI)
 # ifdef CONFIG_DM_PCI
 	if (pplat->vendor == PCI_VENDOR_ID_INTEL) {
 		u16 tmp16;
@@ -327,6 +327,7 @@ static int ahci_host_init(struct ahci_probe_ent *probe_ent)
 	writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
 	tmp = readl(mmio + HOST_CTL);
 	debug("HOST_CTL 0x%x\n", tmp);
+#if !defined(CONFIG_DM_SCSI)
 #ifndef CONFIG_SCSI_AHCI_PLAT
 # ifdef CONFIG_DM_PCI
 	dm_pci_read_config16(dev, PCI_COMMAND, &tmp16);
@@ -338,14 +339,15 @@ static int ahci_host_init(struct ahci_probe_ent *probe_ent)
 	pci_write_config_word(pdev, PCI_COMMAND, tmp16);
 # endif
 #endif
+#endif
 	return 0;
 }
 
 
 static void ahci_print_info(struct ahci_probe_ent *probe_ent)
 {
-#ifndef CONFIG_SCSI_AHCI_PLAT
-# ifdef CONFIG_DM_PCI
+#if !defined(CONFIG_SCSI_AHCI_PLAT) && !defined(CONFIG_DM_SCSI)
+# if defined(CONFIG_DM_PCI)
 	struct udevice *dev = probe_ent->dev;
 # else
 	pci_dev_t pdev = probe_ent->dev;
@@ -372,7 +374,7 @@ static void ahci_print_info(struct ahci_probe_ent *probe_ent)
 	else
 		speed_s = "?";
 
-#ifdef CONFIG_SCSI_AHCI_PLAT
+#if defined(CONFIG_SCSI_AHCI_PLAT) || defined(CONFIG_DM_SCSI)
 	scc_s = "SATA";
 #else
 # ifdef CONFIG_DM_PCI
@@ -424,13 +426,15 @@ static void ahci_print_info(struct ahci_probe_ent *probe_ent)
 }
 
 #ifndef CONFIG_SCSI_AHCI_PLAT
-# ifdef CONFIG_DM_PCI
+# if defined(CONFIG_DM_PCI) || defined(CONFIG_DM_SCSI)
 static int ahci_init_one(struct udevice *dev)
 # else
 static int ahci_init_one(pci_dev_t dev)
 # endif
 {
+#if !defined(CONFIG_DM_SCSI)
 	u16 vendor;
+#endif
 	int rc;
 
 	probe_ent = malloc(sizeof(struct ahci_probe_ent));
@@ -450,6 +454,7 @@ static int ahci_init_one(pci_dev_t dev)
 	probe_ent->pio_mask = 0x1f;
 	probe_ent->udma_mask = 0x7f;	/*Fixme,assume to support UDMA6 */
 
+#if !defined(CONFIG_DM_SCSI)
 #ifdef CONFIG_DM_PCI
 	probe_ent->mmio_base = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_5,
 					      PCI_REGION_MEM);
@@ -473,6 +478,10 @@ static int ahci_init_one(pci_dev_t dev)
 	if (vendor == 0x197b)
 		pci_write_config_byte(dev, 0x41, 0xa1);
 #endif
+#else
+	struct scsi_platdata *plat = dev_get_platdata(dev);
+	probe_ent->mmio_base = (void *)plat->base;
+#endif
 
 	debug("ahci mmio_base=0x%p\n", probe_ent->mmio_base);
 	/* initialize adapter */
@@ -954,14 +963,17 @@ int scsi_exec(ccb *pccb)
 
 }
 
-
+#if defined(CONFIG_DM_SCSI)
+void scsi_low_level_init(int busdevfunc, struct udevice *dev)
+#else
 void scsi_low_level_init(int busdevfunc)
+#endif
 {
 	int i;
 	u32 linkmap;
 
 #ifndef CONFIG_SCSI_AHCI_PLAT
-# ifdef CONFIG_DM_PCI
+# if defined(CONFIG_DM_PCI)
 	struct udevice *dev;
 	int ret;
 
@@ -969,6 +981,8 @@ void scsi_low_level_init(int busdevfunc)
 	if (ret)
 		return;
 	ahci_init_one(dev);
+# elif defined(CONFIG_DM_SCSI)
+	ahci_init_one(dev);
 # else
 	ahci_init_one(busdevfunc);
 # endif
diff --git a/drivers/block/blk-uclass.c b/drivers/block/blk-uclass.c
index 2e041c2..38cb938 100644
--- a/drivers/block/blk-uclass.c
+++ b/drivers/block/blk-uclass.c
@@ -26,7 +26,7 @@ static const char *if_typename_str[IF_TYPE_COUNT] = {
 
 static enum uclass_id if_type_uclass_id[IF_TYPE_COUNT] = {
 	[IF_TYPE_IDE]		= UCLASS_INVALID,
-	[IF_TYPE_SCSI]		= UCLASS_INVALID,
+	[IF_TYPE_SCSI]		= UCLASS_SCSI,
 	[IF_TYPE_ATAPI]		= UCLASS_INVALID,
 	[IF_TYPE_USB]		= UCLASS_MASS_STORAGE,
 	[IF_TYPE_DOC]		= UCLASS_INVALID,
diff --git a/drivers/block/scsi-uclass.c b/drivers/block/scsi-uclass.c
new file mode 100644
index 0000000..05da6cd
--- /dev/null
+++ b/drivers/block/scsi-uclass.c
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ * Copyright (c) 2016 Xilinx, Inc
+ * Written by Michal Simek
+ *
+ * Based on ahci-uclass.c
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <scsi.h>
+
+static int scsi_post_probe(struct udevice *dev)
+{
+	debug("%s: device %p\n", __func__, dev);
+	scsi_low_level_init(0, dev);
+	return 0;
+}
+
+UCLASS_DRIVER(scsi) = {
+	.id		= UCLASS_SCSI,
+	.name		= "scsi",
+	.post_probe	 = scsi_post_probe,
+};