kernel-ark/include/asm-avr32/arch-at32ap/smc.h
Hans-Christian Egtvedt 068d9f6eb9 [AVR32] Add nwait and tdf parameters to SMC configuration
Complete the SMC configuration code by adding nwait and tdf
parameter. After this change, we support the same parameters as the
hardware.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
2007-04-27 13:43:27 +02:00

83 lines
1.8 KiB
C

/*
* Static Memory Controller for AT32 chips
*
* Copyright (C) 2006 Atmel Corporation
*
* Inspired by the OMAP2 General-Purpose Memory Controller interface
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ARCH_AT32AP_SMC_H
#define __ARCH_AT32AP_SMC_H
/*
* All timing parameters are in nanoseconds.
*/
struct smc_config {
/* Delay from address valid to assertion of given strobe */
u16 ncs_read_setup;
u16 nrd_setup;
u16 ncs_write_setup;
u16 nwe_setup;
/* Pulse length of given strobe */
u16 ncs_read_pulse;
u16 nrd_pulse;
u16 ncs_write_pulse;
u16 nwe_pulse;
/* Total cycle length of given operation */
u16 read_cycle;
u16 write_cycle;
/* Bus width in bytes */
u8 bus_width;
/*
* 0: Data is sampled on rising edge of NCS
* 1: Data is sampled on rising edge of NRD
*/
unsigned int nrd_controlled:1;
/*
* 0: Data is driven on falling edge of NCS
* 1: Data is driven on falling edge of NWR
*/
unsigned int nwe_controlled:1;
/*
* 0: NWAIT is disabled
* 1: Reserved
* 2: NWAIT is frozen mode
* 3: NWAIT in ready mode
*/
unsigned int nwait_mode:2;
/*
* 0: Byte select access type
* 1: Byte write access type
*/
unsigned int byte_write:1;
/*
* Number of clock cycles before data is released after
* the rising edge of the read controlling signal
*
* Total cycles from SMC is tdf_cycles + 1
*/
unsigned int tdf_cycles:4;
/*
* 0: TDF optimization disabled
* 1: TDF optimization enabled
*/
unsigned int tdf_mode:1;
};
extern int smc_set_configuration(int cs, const struct smc_config *config);
extern struct smc_config *smc_get_configuration(int cs);
#endif /* __ARCH_AT32AP_SMC_H */