#define __LINUX_ATA_H__
#include <linux/types.h>
+#include <asm/byteorder.h>
/* defines only for the constants which don't work well as enums */
#define ATA_DMA_BOUNDARY 0xffffUL
return ata_id_major_version(dev_id) >= 7 && (dev_id[62] & 0x8000);
}
+/*
+ * ata_id_is_lba_capacity_ok() performs a sanity check on
+ * the claimed LBA capacity value for the device.
+ *
+ * Returns 1 if LBA capacity looks sensible, 0 otherwise.
+ *
+ * It is called only once for each device.
+ */
+static inline int ata_id_is_lba_capacity_ok(u16 *id)
+{
+ unsigned long lba_sects, chs_sects, head, tail;
+
+ /* No non-LBA info .. so valid! */
+ if (id[ATA_ID_CYLS] == 0)
+ return 1;
+
+ lba_sects = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
+
+ /*
+ * The ATA spec tells large drives to return
+ * C/H/S = 16383/16/63 independent of their size.
+ * Some drives can be jumpered to use 15 heads instead of 16.
+ * Some drives can be jumpered to use 4092 cyls instead of 16383.
+ */
+ if ((id[ATA_ID_CYLS] == 16383 ||
+ (id[ATA_ID_CYLS] == 4092 && id[ATA_ID_CUR_CYLS] == 16383)) &&
+ id[ATA_ID_SECTORS] == 63 &&
+ (id[ATA_ID_HEADS] == 15 || id[ATA_ID_HEADS] == 16) &&
+ (lba_sects >= 16383 * 63 * id[ATA_ID_HEADS]))
+ return 1;
+
+ chs_sects = id[ATA_ID_CYLS] * id[ATA_ID_HEADS] * id[ATA_ID_SECTORS];
+
+ /* perform a rough sanity check on lba_sects: within 10% is OK */
+ if (lba_sects - chs_sects < chs_sects/10)
+ return 1;
+
+ /* some drives have the word order reversed */
+ head = (lba_sects >> 16) & 0xffff;
+ tail = lba_sects & 0xffff;
+ lba_sects = head | (tail << 16);
+
+ if (lba_sects - chs_sects < chs_sects/10) {
+ *(__le32 *)&id[ATA_ID_LBA_CAPACITY] = __cpu_to_le32(lba_sects);
+ return 1; /* LBA capacity is (now) good */
+ }
+
+ return 0; /* LBA capacity value may be bad */
+}
+
+static inline void ata_id_to_hd_driveid(u16 *id)
+{
+#ifdef __BIG_ENDIAN
+ /* accessed in struct hd_driveid as 8-bit values */
+ id[ATA_ID_MAX_MULTSECT] = __cpu_to_le16(id[ATA_ID_MAX_MULTSECT]);
+ id[ATA_ID_CAPABILITY] = __cpu_to_le16(id[ATA_ID_CAPABILITY]);
+ id[ATA_ID_OLD_PIO_MODES] = __cpu_to_le16(id[ATA_ID_OLD_PIO_MODES]);
+ id[ATA_ID_OLD_DMA_MODES] = __cpu_to_le16(id[ATA_ID_OLD_DMA_MODES]);
+ id[ATA_ID_MULTSECT] = __cpu_to_le16(id[ATA_ID_MULTSECT]);
+
+ /* as 32-bit values */
+ *(u32 *)&id[ATA_ID_LBA_CAPACITY] = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
+ *(u32 *)&id[ATA_ID_SPG] = ata_id_u32(id, ATA_ID_SPG);
+
+ /* as 64-bit value */
+ *(u64 *)&id[ATA_ID_LBA_CAPACITY_2] =
+ ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
+#endif
+}
+
static inline int is_multi_taskfile(struct ata_taskfile *tf)
{
return (tf->command == ATA_CMD_READ_MULTI) ||