linux-stable/include/linux/ata_platform.h
Alexander Shiyan f3d5e4f18d ata: pata_of_platform: Allow to use 16-bit wide data transfer
In some cases, the system bus can be configured for 16-bit mode,
in this case using read/write functions for 32-bit values
results in two cycles of 16 bits each, which is wrong.
This patch adds the devicetree flag to switch the driver to
use 16-bit mode for I/O transfers.

Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-02-08 06:42:53 -07:00

32 lines
749 B
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_ATA_PLATFORM_H
#define __LINUX_ATA_PLATFORM_H
struct pata_platform_info {
/*
* I/O port shift, for platforms with ports that are
* constantly spaced and need larger than the 1-byte
* spacing used by ata_std_ports().
*/
unsigned int ioport_shift;
};
struct scsi_host_template;
extern int __pata_platform_probe(struct device *dev,
struct resource *io_res,
struct resource *ctl_res,
struct resource *irq_res,
unsigned int ioport_shift,
int __pio_mask,
struct scsi_host_template *sht,
bool use16bit);
/*
* Marvell SATA private data
*/
struct mv_sata_platform_data {
int n_ports; /* number of sata ports */
};
#endif /* __LINUX_ATA_PLATFORM_H */