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>

common/board_r.c

@@ -620,7 +620,7 @@ static int initr_ambapp_print(void)
 }
 #endif
 
-#if defined(CONFIG_SCSI)
+#if defined(CONFIG_SCSI) && !defined(CONFIG_DM_SCSI)
 static int initr_scsi(void)
 {
 	puts("SCSI:  ");
@@ -923,7 +923,7 @@ init_fnc_t init_sequence_r[] = {
 	initr_ambapp_print,
 #endif
 #endif
-#ifdef CONFIG_SCSI
+#if defined(CONFIG_SCSI) && !defined(CONFIG_DM_SCSI)
 	INIT_FUNC_WATCHDOG_RESET
 	initr_scsi,
 #endif

common/scsi.c

@@ -10,7 +10,10 @@
 #include <inttypes.h>
 #include <pci.h>
 #include <scsi.h>
+#include <dm/device-internal.h>
+#include <dm/uclass-internal.h>
 
+#if !defined(CONFIG_DM_SCSI)
 #ifdef CONFIG_SCSI_DEV_LIST
 #define SCSI_DEV_LIST CONFIG_SCSI_DEV_LIST
 #else
@@ -31,6 +34,7 @@
 #endif
 #define SCSI_DEV_LIST {SCSI_VEND_ID, SCSI_DEV_ID}
 #endif
+#endif
 
 #if defined(CONFIG_PCI) && !defined(CONFIG_SCSI_AHCI_PLAT)
 const struct pci_device_id scsi_device_list[] = { SCSI_DEV_LIST };
@@ -39,11 +43,13 @@ static ccb tempccb;	/* temporary scsi command buffer */
 
 static unsigned char tempbuff[512]; /* temporary data buffer */
 
+#if !defined(CONFIG_DM_SCSI)
 static int scsi_max_devs; /* number of highest available scsi device */
 
 static int scsi_curr_dev; /* current device */
 
 static struct blk_desc scsi_dev_desc[CONFIG_SYS_SCSI_MAX_DEVICE];
+#endif
 
 /* almost the maximum amount of the scsi_ext command.. */
 #define SCSI_MAX_READ_BLK 0xFFFF
@@ -444,6 +450,7 @@ static void scsi_init_dev_desc_priv(struct blk_desc *dev_desc)
 #endif
 }
 
+#if !defined(CONFIG_DM_SCSI)
 /**
  * scsi_init_dev_desc - initialize all SCSI specific blk_desc properties
  *
@@ -460,6 +467,7 @@ static void scsi_init_dev_desc(struct blk_desc *dev_desc, int devnum)
 
 	scsi_init_dev_desc_priv(dev_desc);
 }
+#endif
 
 /**
  * scsi_detect_dev - Detect scsi device
@@ -540,6 +548,73 @@ removable:
  * (re)-scan the scsi bus and reports scsi device info
  * to the user if mode = 1
  */
+#if defined(CONFIG_DM_SCSI)
+int scsi_scan(int mode)
+{
+	unsigned char i, lun;
+	struct uclass *uc;
+	struct udevice *dev; /* SCSI controller */
+	int ret;
+
+	if (mode == 1)
+		printf("scanning bus for devices...\n");
+
+	ret = uclass_get(UCLASS_SCSI, &uc);
+	if (ret)
+		return ret;
+
+	uclass_foreach_dev(dev, uc) {
+		struct scsi_platdata *plat; /* scsi controller platdata */
+
+		/* probe SCSI controller driver */
+		ret = device_probe(dev);
+		if (ret)
+			return ret;
+
+		/* Get controller platdata */
+		plat = dev_get_platdata(dev);
+
+		for (i = 0; i < plat->max_id; i++) {
+			for (lun = 0; lun < plat->max_lun; lun++) {
+				struct udevice *bdev; /* block device */
+				/* block device description */
+				struct blk_desc *bdesc;
+				char str[10];
+
+				/*
+				 * Create only one block device and do detection
+				 * to make sure that there won't be a lot of
+				 * block devices created
+				 */
+				snprintf(str, sizeof(str), "id%dlun%d", i, lun);
+				ret = blk_create_devicef(dev, "scsi_blk",
+							  str, IF_TYPE_SCSI,
+							  -1, 0, 0, &bdev);
+				if (ret) {
+					debug("Can't create device\n");
+					return ret;
+				}
+				bdesc = dev_get_uclass_platdata(bdev);
+
+				scsi_init_dev_desc_priv(bdesc);
+				bdesc->lun = lun;
+				ret = scsi_detect_dev(i, bdesc);
+				if (ret) {
+					device_unbind(bdev);
+					continue;
+				}
+
+				if (mode == 1) {
+					printf("  Device %d: ", 0);
+					dev_print(bdesc);
+				} /* if mode */
+			} /* next LUN */
+		}
+	}
+
+	return 0;
+}
+#else
 int scsi_scan(int mode)
 {
 	unsigned char i, lun;
@@ -576,6 +651,7 @@ int scsi_scan(int mode)
 #endif
 	return 0;
 }
+#endif
 
 #ifdef CONFIG_BLK
 static const struct blk_ops scsi_blk_ops = {

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

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

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

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,

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,
+};

include/ahci.h

@@ -145,7 +145,7 @@ struct ahci_ioports {
 };
 
 struct ahci_probe_ent {
-#ifdef CONFIG_DM_PCI
+#if defined(CONFIG_DM_PCI) || defined(CONFIG_DM_SCSI)
 	struct udevice *dev;
 #else
 	pci_dev_t	dev;

include/dm/uclass-id.h

@@ -66,6 +66,7 @@ enum uclass_id {
 	UCLASS_REMOTEPROC,	/* Remote Processor device */
 	UCLASS_RESET,		/* Reset controller device */
 	UCLASS_RTC,		/* Real time clock device */
+	UCLASS_SCSI,		/* SCSI device */
 	UCLASS_SERIAL,		/* Serial UART */
 	UCLASS_SPI,		/* SPI bus */
 	UCLASS_SPMI,		/* System Power Management Interface bus */

include/sata.h

@@ -2,6 +2,7 @@
 #define __SATA_H__
 #include <part.h>
 
+#if !defined(CONFIG_DM_SCSI)
 int init_sata(int dev);
 int reset_sata(int dev);
 int scan_sata(int dev);
@@ -15,5 +16,6 @@ int __sata_stop(void);
 int sata_port_status(int dev, int port);
 
 extern struct blk_desc sata_dev_desc[];
+#endif
 
 #endif

include/scsi.h

@@ -166,8 +166,11 @@ typedef struct SCSI_cmd_block{
 void scsi_print_error(ccb *pccb);
 int scsi_exec(ccb *pccb);
 void scsi_bus_reset(void);
+#if !defined(CONFIG_DM_SCSI)
 void scsi_low_level_init(int busdevfunc);
-
+#else
+void scsi_low_level_init(int busdevfunc, struct udevice *dev);
+#endif
 
 /***************************************************************************
  * functions residing inside cmd_scsi.c
@@ -175,6 +178,21 @@ void scsi_low_level_init(int busdevfunc);
 void scsi_init(void);
 int scsi_scan(int mode);
 
+#if defined(CONFIG_DM_SCSI)
+/**
+ * struct scsi_platdata - stores information about SCSI controller
+ *
+ * @base: Controller base address
+ * @max_lun: Maximum number of logical units
+ * @max_id: Maximum number of target ids
+ */
+struct scsi_platdata {
+	unsigned long base;
+	unsigned long max_lun;
+	unsigned long max_id;
+};
+#endif
+
 #define SCSI_IDENTIFY					0xC0  /* not used */
 
 /* Hardware errors  */