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/*
* Atmel SMC (Static Memory Controller) register offsets and bit definitions.
*
* Copyright (C) 2014 Atmel
* Copyright (C) 2014 Free Electrons
*
* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
*
* 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 _LINUX_MFD_SYSCON_ATMEL_SMC_H_
#define _LINUX_MFD_SYSCON_ATMEL_SMC_H_
#include <linux/kernel.h>
#include <linux/regmap.h>
#define AT91SAM9_SMC_GENERIC 0x00
#define AT91SAM9_SMC_GENERIC_BLK_SZ 0x10
#define SAMA5_SMC_GENERIC 0x600
#define SAMA5_SMC_GENERIC_BLK_SZ 0x14
#define AT91SAM9_SMC_SETUP(o) ((o) + 0x00)
#define AT91SAM9_SMC_NWESETUP(x) (x)
#define AT91SAM9_SMC_NCS_WRSETUP(x) ((x) << 8)
#define AT91SAM9_SMC_NRDSETUP(x) ((x) << 16)
#define AT91SAM9_SMC_NCS_NRDSETUP(x) ((x) << 24)
#define AT91SAM9_SMC_PULSE(o) ((o) + 0x04)
#define AT91SAM9_SMC_NWEPULSE(x) (x)
#define AT91SAM9_SMC_NCS_WRPULSE(x) ((x) << 8)
#define AT91SAM9_SMC_NRDPULSE(x) ((x) << 16)
#define AT91SAM9_SMC_NCS_NRDPULSE(x) ((x) << 24)
#define AT91SAM9_SMC_CYCLE(o) ((o) + 0x08)
#define AT91SAM9_SMC_NWECYCLE(x) (x)
#define AT91SAM9_SMC_NRDCYCLE(x) ((x) << 16)
#define AT91SAM9_SMC_MODE(o) ((o) + 0x0c)
#define SAMA5_SMC_MODE(o) ((o) + 0x10)
#define AT91_SMC_READMODE BIT(0)
#define AT91_SMC_READMODE_NCS (0 << 0)
#define AT91_SMC_READMODE_NRD (1 << 0)
#define AT91_SMC_WRITEMODE BIT(1)
#define AT91_SMC_WRITEMODE_NCS (0 << 1)
#define AT91_SMC_WRITEMODE_NWE (1 << 1)
#define AT91_SMC_EXNWMODE GENMASK(5, 4)
#define AT91_SMC_EXNWMODE_DISABLE (0 << 4)
#define AT91_SMC_EXNWMODE_FROZEN (2 << 4)
#define AT91_SMC_EXNWMODE_READY (3 << 4)
#define AT91_SMC_BAT BIT(8)
#define AT91_SMC_BAT_SELECT (0 << 8)
#define AT91_SMC_BAT_WRITE (1 << 8)
#define AT91_SMC_DBW GENMASK(13, 12)
#define AT91_SMC_DBW_8 (0 << 12)
#define AT91_SMC_DBW_16 (1 << 12)
#define AT91_SMC_DBW_32 (2 << 12)
#define AT91_SMC_TDF GENMASK(19, 16)
#define AT91_SMC_TDF_(x) ((((x) - 1) << 16) & AT91_SMC_TDF)
#define AT91_SMC_TDF_MAX 16
#define AT91_SMC_TDFMODE_OPTIMIZED BIT(20)
#define AT91_SMC_PMEN BIT(24)
#define AT91_SMC_PS GENMASK(29, 28)
#define AT91_SMC_PS_4 (0 << 28)
#define AT91_SMC_PS_8 (1 << 28)
#define AT91_SMC_PS_16 (2 << 28)
#define AT91_SMC_PS_32 (3 << 28)
/*
* This function converts a setup timing expressed in nanoseconds into an
* encoded value that can be written in the SMC_SETUP register.
*
* The following formula is described in atmel datasheets (section
* "SMC Setup Register"):
*
* setup length = (128* SETUP[5] + SETUP[4:0])
*
* where setup length is the timing expressed in cycles.
*/
static inline u32 at91sam9_smc_setup_ns_to_cycles(unsigned int clk_rate,
u32 timing_ns)
{
u32 clk_period = DIV_ROUND_UP(NSEC_PER_SEC, clk_rate);
u32 coded_cycles = 0;
u32 cycles;
cycles = DIV_ROUND_UP(timing_ns, clk_period);
if (cycles / 32) {
coded_cycles |= 1 << 5;
if (cycles < 128)
cycles = 0;
}
coded_cycles |= cycles % 32;
return coded_cycles;
}
/*
* This function converts a pulse timing expressed in nanoseconds into an
* encoded value that can be written in the SMC_PULSE register.
*
* The following formula is described in atmel datasheets (section
* "SMC Pulse Register"):
*
* pulse length = (256* PULSE[6] + PULSE[5:0])
*
* where pulse length is the timing expressed in cycles.
*/
static inline u32 at91sam9_smc_pulse_ns_to_cycles(unsigned int clk_rate,
u32 timing_ns)
{
u32 clk_period = DIV_ROUND_UP(NSEC_PER_SEC, clk_rate);
u32 coded_cycles = 0;
u32 cycles;
cycles = DIV_ROUND_UP(timing_ns, clk_period);
if (cycles / 64) {
coded_cycles |= 1 << 6;
if (cycles < 256)
cycles = 0;
}
coded_cycles |= cycles % 64;
return coded_cycles;
}
/*
* This function converts a cycle timing expressed in nanoseconds into an
* encoded value that can be written in the SMC_CYCLE register.
*
* The following formula is described in atmel datasheets (section
* "SMC Cycle Register"):
*
* cycle length = (CYCLE[8:7]*256 + CYCLE[6:0])
*
* where cycle length is the timing expressed in cycles.
*/
static inline u32 at91sam9_smc_cycle_ns_to_cycles(unsigned int clk_rate,
u32 timing_ns)
{
u32 clk_period = DIV_ROUND_UP(NSEC_PER_SEC, clk_rate);
u32 coded_cycles = 0;
u32 cycles;
cycles = DIV_ROUND_UP(timing_ns, clk_period);
if (cycles / 128) {
coded_cycles = cycles / 256;
cycles %= 256;
if (cycles >= 128) {
coded_cycles++;
cycles = 0;
}
if (coded_cycles > 0x3) {
coded_cycles = 0x3;
cycles = 0x7f;
}
coded_cycles <<= 7;
}
coded_cycles |= cycles % 128;
return coded_cycles;
}
#endif /* _LINUX_MFD_SYSCON_ATMEL_SMC_H_ */
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