mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-09 21:23:12 +00:00
5daa3ba0c6
Fix some outstanding issues with the pxa2xx_spi driver when running on a PXA270: - Wrong timeout calculation in the setup function due to different peripheral clock rates in the PXAxxx family. - Bad handling of SSSR_TFS interrupts in interrupt_transfer function. - Added locking to interface between the pump_messages workqueue and the pump_transfers tasklet. Much thanks to Juergen Beisert for the extensive testing on the PXA270. Signed-off-by: Stephen Street <stephen@streetfiresound.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/*
|
|
* Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#ifndef PXA2XX_SPI_H_
|
|
#define PXA2XX_SPI_H_
|
|
|
|
#define PXA2XX_CS_ASSERT (0x01)
|
|
#define PXA2XX_CS_DEASSERT (0x02)
|
|
|
|
#if defined(CONFIG_PXA25x)
|
|
#define CLOCK_SPEED_HZ 3686400
|
|
#define SSP1_SerClkDiv(x) (((CLOCK_SPEED_HZ/2/(x+1))<<8)&0x0000ff00)
|
|
#define SSP2_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
|
|
#define SSP3_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
|
|
#define SSP_TIMEOUT_SCALE (2712)
|
|
#elif defined(CONFIG_PXA27x)
|
|
#define CLOCK_SPEED_HZ 13000000
|
|
#define SSP1_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
|
|
#define SSP2_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
|
|
#define SSP3_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
|
|
#define SSP_TIMEOUT_SCALE (769)
|
|
#endif
|
|
|
|
#define SSP_TIMEOUT(x) ((x*10000)/SSP_TIMEOUT_SCALE)
|
|
#define SSP1_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(1)))))
|
|
#define SSP2_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(2)))))
|
|
#define SSP3_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(3)))))
|
|
|
|
enum pxa_ssp_type {
|
|
SSP_UNDEFINED = 0,
|
|
PXA25x_SSP, /* pxa 210, 250, 255, 26x */
|
|
PXA25x_NSSP, /* pxa 255, 26x (including ASSP) */
|
|
PXA27x_SSP,
|
|
};
|
|
|
|
/* device.platform_data for SSP controller devices */
|
|
struct pxa2xx_spi_master {
|
|
enum pxa_ssp_type ssp_type;
|
|
u32 clock_enable;
|
|
u16 num_chipselect;
|
|
u8 enable_dma;
|
|
};
|
|
|
|
/* spi_board_info.controller_data for SPI slave devices,
|
|
* copied to spi_device.platform_data ... mostly for dma tuning
|
|
*/
|
|
struct pxa2xx_spi_chip {
|
|
u8 tx_threshold;
|
|
u8 rx_threshold;
|
|
u8 dma_burst_size;
|
|
u32 timeout_microsecs;
|
|
u8 enable_loopback;
|
|
void (*cs_control)(u32 command);
|
|
};
|
|
|
|
#endif /*PXA2XX_SPI_H_*/
|