Add driver for S-ATA-controller on Intel processors with South

Bridge, ICH-5, ICH-6 and ICH-7. 

Implementation:

1. Code is divided in to two files. All functions, which are
   controller specific are kept in "drivers/ata_piix.c" file and
   functions, which are not controller specific, are kept in
   "common/cmd_sata.c" file.

2. Reading and Writing from the S-ATA drive is done using PIO method.

3. Driver can be configured for 48-bit addressing by defining macro
   CONFIG_LBA48, if this macro is not defined driver uses the 28-bit
   addressing.

4. S-ATA read function is hooked to the File system, commands like
   ext2ls and ext2load file can be used. This has been tested.

5. U-Boot command "SATA_init" is added, which initializes the S-ATA
   controller and identifies the S-ATA drives connected to it.

6. U-Boot command "sata" is added, which is used to read/write, print
   partition table and get info about the drives present. This I have
   implemented in same way as "ide" command is implemented in U-Boot.

7. This driver is for S-ATA in native mode.

8. This driver does not support the Native command queuing and
   Hot-plugging.

Signed-off-by: Mushtaq Khan <mushtaq_k@procsys.com>

3 files changed, 177 insertions, 0 deletions

diff --git a/include/ata.h b/include/ata.h
index 8584226..d36bdf6 100644
--- a/include/ata.h
+++ b/include/ata.h
@@ -83,6 +83,66 @@
 #define ATA_DEVICE(x)	((x & 1)<<4)
 #define ATA_LBA		0xE0
 
+enum {
+	ATA_MAX_DEVICES = 1,	/* per bus/port */
+	ATA_MAX_PRD = 256,	/* we could make these 256/256 */
+	ATA_SECT_SIZE = 256,	/*256 words per sector */
+
+	/* bits in ATA command block registers */
+	ATA_HOB = (1 << 7),	/* LBA48 selector */
+	ATA_NIEN = (1 << 1),	/* disable-irq flag */
+	/*ATA_LBA                 = (1 << 6), *//* LBA28 selector */
+	ATA_DEV1 = (1 << 4),	/* Select Device 1 (slave) */
+	ATA_DEVICE_OBS = (1 << 7) | (1 << 5),	/* obs bits in dev reg */
+	ATA_DEVCTL_OBS = (1 << 3),	/* obsolete bit in devctl reg */
+	ATA_BUSY = (1 << 7),	/* BSY status bit */
+	ATA_DRDY = (1 << 6),	/* device ready */
+	ATA_DF = (1 << 5),	/* device fault */
+	ATA_DRQ = (1 << 3),	/* data request i/o */
+	ATA_ERR = (1 << 0),	/* have an error */
+	ATA_SRST = (1 << 2),	/* software reset */
+	ATA_ABORTED = (1 << 2),	/* command aborted */
+	/* ATA command block registers */
+	ATA_REG_DATA = 0x00,
+	ATA_REG_ERR = 0x01,
+	ATA_REG_NSECT = 0x02,
+	ATA_REG_LBAL = 0x03,
+	ATA_REG_LBAM = 0x04,
+	ATA_REG_LBAH = 0x05,
+	ATA_REG_DEVICE = 0x06,
+	ATA_REG_STATUS = 0x07,
+	ATA_PCI_CTL_OFS = 0x02,
+	/* and their aliases */
+	ATA_REG_FEATURE = ATA_REG_ERR,
+	ATA_REG_CMD = ATA_REG_STATUS,
+	ATA_REG_BYTEL = ATA_REG_LBAM,
+	ATA_REG_BYTEH = ATA_REG_LBAH,
+	ATA_REG_DEVSEL = ATA_REG_DEVICE,
+	ATA_REG_IRQ = ATA_REG_NSECT,
+
+	/* SETFEATURES stuff */
+	SETFEATURES_XFER = 0x03,
+	XFER_UDMA_7 = 0x47,
+	XFER_UDMA_6 = 0x46,
+	XFER_UDMA_5 = 0x45,
+	XFER_UDMA_4 = 0x44,
+	XFER_UDMA_3 = 0x43,
+	XFER_UDMA_2 = 0x42,
+	XFER_UDMA_1 = 0x41,
+	XFER_UDMA_0 = 0x40,
+	XFER_MW_DMA_2 = 0x22,
+	XFER_MW_DMA_1 = 0x21,
+	XFER_MW_DMA_0 = 0x20,
+	XFER_PIO_4 = 0x0C,
+	XFER_PIO_3 = 0x0B,
+	XFER_PIO_2 = 0x0A,
+	XFER_PIO_1 = 0x09,
+	XFER_PIO_0 = 0x08,
+	XFER_SW_DMA_2 = 0x12,
+	XFER_SW_DMA_1 = 0x11,
+	XFER_SW_DMA_0 = 0x10,
+	XFER_PIO_SLOW = 0x00
+};
 /*
  * ATA Commands (only mandatory commands listed here)
  */
diff --git a/include/configs/sc520_cdp.h b/include/configs/sc520_cdp.h
index d7d07a6..8b2ec07 100644
--- a/include/configs/sc520_cdp.h
+++ b/include/configs/sc520_cdp.h
@@ -182,6 +182,15 @@
 #undef  CONFIG_IDE_RESET_ROUTINE	/* no special reset function */
 
 /************************************************************
+*SATA/Native Stuff
+************************************************************/
+#define CFG_SATA_SUPPORTED      1
+#define CFG_SATA_MAXBUS         2       /*Max Sata buses supported */
+#define CFG_SATA_DEVS_PER_BUS   2      /*Max no. of devices per bus/port */
+#define CFG_SATA_MAXDEVICES     (CFG_SATA_MAXBUS* CFG_SATA_DEVS_PER_BUS)
+#define CFG_ATA_PIIX            1       /*Supports ata_piix driver */
+
+/************************************************************
  * ATAPI support (experimental)
  ************************************************************/
 #define CONFIG_ATAPI			/* enable ATAPI Support */
diff --git a/include/sata.h b/include/sata.h
new file mode 100644
index 0000000..c6fa2ab
--- /dev/null
+++ b/include/sata.h
@@ -0,0 +1,108 @@
+
+#if (DEBUG_SATA)
+#define PRINTF(fmt,args...)	printf (fmt ,##args)
+#else
+#define PRINTF(fmt,args...)
+#endif
+
+struct sata_ioports {
+	unsigned long cmd_addr;
+	unsigned long data_addr;
+	unsigned long error_addr;
+	unsigned long feature_addr;
+	unsigned long nsect_addr;
+	unsigned long lbal_addr;
+	unsigned long lbam_addr;
+	unsigned long lbah_addr;
+	unsigned long device_addr;
+	unsigned long status_addr;
+	unsigned long command_addr;
+	unsigned long altstatus_addr;
+	unsigned long ctl_addr;
+	unsigned long bmdma_addr;
+	unsigned long scr_addr;
+};
+
+struct sata_port {
+	unsigned char port_no;	/*primary-0, secondary=1 */
+	struct sata_ioports ioaddr;	/*ATA cmd/ctl/dma reg blks */
+	unsigned char ctl_reg;
+	unsigned char last_ctl;
+	unsigned char port_state;	/*1-port is present and 
+					   0-port is not available */
+	unsigned char dev_mask;
+};
+
+/***********SATA LIBRARY SPECIFIC DEFINITIONS AND DECLARATIONS**************/
+#ifdef SATA_DECL		/*SATA library specific declarations */
+#define ata_id_has_lba48(id)    ((id)[83] & (1 << 10))
+#define ata_id_has_lba(id)      ((id)[49] & (1 << 9))
+#define ata_id_has_dma(id)      ((id)[49] & (1 << 8))
+#define ata_id_u32(id,n)        \
+	(((u32) (id)[(n) + 1] << 16) | ((u32) (id)[(n)]))
+#define ata_id_u64(id,n)        \
+	(((u64) (id)[(n) + 3] << 48) | \
+	((u64) (id)[(n) + 2] << 32) | \
+	((u64) (id)[(n) + 1] << 16) | \
+	((u64) (id)[(n) + 0]) )
+#endif
+
+#ifdef SATA_DECL		/*SATA library specific declarations */
+static inline void
+ata_dump_id (u16 * id)
+{
+	PRINTF ("49==0x%04x  "
+		"53==0x%04x  "
+		"63==0x%04x  "
+		"64==0x%04x  "
+		"75==0x%04x  \n", id[49], id[53], id[63], id[64], id[75]);
+	PRINTF ("80==0x%04x  "
+		"81==0x%04x  "
+		"82==0x%04x  "
+		"83==0x%04x  "
+		"84==0x%04x  \n", id[80], id[81], id[82], id[83], id[84]);
+	PRINTF ("88==0x%04x  " "93==0x%04x\n", id[88], id[93]);
+}
+#endif
+
+#ifdef SATA_DECL		/*SATA library specific declarations */
+int sata_bus_softreset (int num);
+void sata_identify (int num, int dev);
+void sata_port (struct sata_ioports *ioport);
+void set_Feature_cmd (int num, int dev);
+int sata_devchk (struct sata_ioports *ioaddr, int dev);
+void dev_select (struct sata_ioports *ioaddr, int dev);
+u8 sata_busy_wait (struct sata_ioports *ioaddr, int bits, unsigned int max);
+u8 sata_chk_status (struct sata_ioports *ioaddr);
+ulong sata_read (int device, lbaint_t blknr, ulong blkcnt, ulong * buffer);
+ulong sata_write (int device, lbaint_t blknr, ulong blkcnt, ulong * buffer);
+void msleep (int count);
+#else
+extern int sata_bus_softreset (int num);
+extern void sata_identify (int num, int dev);
+extern void sata_port (struct sata_ioports *ioport);
+extern void set_Feature_cmd (int num, int dev);
+extern ulong sata_read (int device, lbaint_t blknr,
+			ulong blkcnt, ulong * buffer);
+extern ulong sata_write (int device, lbaint_t blknr,
+			 ulong blkcnt, ulong * buffer);
+extern void msleep (int count);
+#endif
+
+/************DRIVER SPECIFIC DEFINITIONS AND DECLARATIONS**************/
+
+#ifdef DRV_DECL			/*Driver specific declaration */
+int init_sata (void);
+#else
+extern int init_sata (void);
+#endif
+
+#ifdef DRV_DECL			/*Defines Driver Specific variables */
+struct sata_port port[CFG_SATA_MAXBUS];
+block_dev_desc_t sata_dev_desc[CFG_SATA_MAXDEVICES];
+int curr_dev = -1;
+#else
+extern struct sata_port port[CFG_SATA_MAXBUS];
+extern block_dev_desc_t sata_dev_desc[CFG_SATA_MAXDEVICES];
+extern int curr_dev;
+#endif