diff options
Diffstat (limited to 'include/linux/libata.h')
| -rw-r--r-- | include/linux/libata.h | 82 |
1 files changed, 77 insertions, 5 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h index 00a8a57..dcd17e7 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -155,6 +155,10 @@ enum { ATA_SHIFT_UDMA = 0, ATA_SHIFT_MWDMA = 8, ATA_SHIFT_PIO = 11, + + /* size of buffer to pad xfers ending on unaligned boundaries */ + ATA_DMA_PAD_SZ = 4, + ATA_DMA_PAD_BUF_SZ = ATA_DMA_PAD_SZ * ATA_MAX_QUEUE, /* Masks for port functions */ ATA_PORT_PRIMARY = (1 << 0), @@ -172,6 +176,13 @@ enum hsm_task_states { HSM_ST_ERR, }; +enum ata_completion_errors { + AC_ERR_OTHER = (1 << 0), + AC_ERR_DEV = (1 << 1), + AC_ERR_ATA_BUS = (1 << 2), + AC_ERR_HOST_BUS = (1 << 3), +}; + /* forward declarations */ struct scsi_device; struct ata_port_operations; @@ -179,7 +190,7 @@ struct ata_port; struct ata_queued_cmd; /* typedefs */ -typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, u8 drv_stat); +typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, unsigned int err_mask); struct ata_ioports { unsigned long cmd_addr; @@ -242,9 +253,12 @@ struct ata_queued_cmd { unsigned long flags; /* ATA_QCFLAG_xxx */ unsigned int tag; unsigned int n_elem; + unsigned int orig_n_elem; int dma_dir; + unsigned int pad_len; + unsigned int nsect; unsigned int cursect; @@ -255,9 +269,11 @@ struct ata_queued_cmd { unsigned int cursg_ofs; struct scatterlist sgent; + struct scatterlist pad_sgent; void *buf_virt; - struct scatterlist *sg; + /* DO NOT iterate over __sg manually, use ata_for_each_sg() */ + struct scatterlist *__sg; ata_qc_cb_t complete_fn; @@ -303,6 +319,9 @@ struct ata_port { struct ata_prd *prd; /* our SG list */ dma_addr_t prd_dma; /* and its DMA mapping */ + void *pad; /* array of DMA pad buffers */ + dma_addr_t pad_dma; + struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */ u8 ctl; /* cache of ATA control register */ @@ -347,7 +366,6 @@ struct ata_port_operations { void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf); u8 (*check_status)(struct ata_port *ap); u8 (*check_altstatus)(struct ata_port *ap); - u8 (*check_err)(struct ata_port *ap); void (*dev_select)(struct ata_port *ap, unsigned int device); void (*phy_reset) (struct ata_port *ap); @@ -434,7 +452,6 @@ extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device); extern void ata_std_dev_select (struct ata_port *ap, unsigned int device); extern u8 ata_check_status(struct ata_port *ap); extern u8 ata_altstatus(struct ata_port *ap); -extern u8 ata_chk_err(struct ata_port *ap); extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf); extern int ata_port_start (struct ata_port *ap); extern void ata_port_stop (struct ata_port *ap); @@ -455,7 +472,7 @@ extern void ata_bmdma_start (struct ata_queued_cmd *qc); extern void ata_bmdma_stop(struct ata_queued_cmd *qc); extern u8 ata_bmdma_status(struct ata_port *ap); extern void ata_bmdma_irq_clear(struct ata_port *ap); -extern void ata_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat); +extern void ata_qc_complete(struct ata_queued_cmd *qc, unsigned int err_mask); extern void ata_eng_timeout(struct ata_port *ap); extern void ata_scsi_simulate(u16 *id, struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)); @@ -507,6 +524,31 @@ extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bit #endif /* CONFIG_PCI */ +static inline int +ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc) +{ + if (sg == &qc->pad_sgent) + return 1; + if (qc->pad_len) + return 0; + if (((sg - qc->__sg) + 1) == qc->n_elem) + return 1; + return 0; +} + +static inline struct scatterlist * +ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc) +{ + if (sg == &qc->pad_sgent) + return NULL; + if (++sg - qc->__sg < qc->n_elem) + return sg; + return qc->pad_len ? &qc->pad_sgent : NULL; +} + +#define ata_for_each_sg(sg, qc) \ + for (sg = qc->__sg; sg; sg = ata_qc_next_sg(sg, qc)) + static inline unsigned int ata_tag_valid(unsigned int tag) { return (tag < ATA_MAX_QUEUE) ? 1 : 0; @@ -718,4 +760,34 @@ static inline int ata_try_flush_cache(const struct ata_device *dev) ata_id_has_flush_ext(dev->id); } +static inline unsigned int ac_err_mask(u8 status) +{ + if (status & ATA_BUSY) + return AC_ERR_ATA_BUS; + if (status & (ATA_ERR | ATA_DF)) + return AC_ERR_DEV; + return 0; +} + +static inline unsigned int __ac_err_mask(u8 status) +{ + unsigned int mask = ac_err_mask(status); + if (mask == 0) + return AC_ERR_OTHER; + return mask; +} + +static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev) +{ + ap->pad_dma = 0; + ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ, + &ap->pad_dma, GFP_KERNEL); + return (ap->pad == NULL) ? -ENOMEM : 0; +} + +static inline void ata_pad_free(struct ata_port *ap, struct device *dev) +{ + dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma); +} + #endif /* __LINUX_LIBATA_H__ */ |
