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mfd: syscon: atmel-smc: Add new helpers to ease SMC regs manipulation

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Add helper functions for atmel Static Memory Controller. The functions
are required to configure SMC. This file is inherited from the work
done by Boris Brezillon for Linux

Signed-off-by: Balamanikandan Gunasundar <balamanikandan.gunasundar@microchip.com>
This commit is contained in:
Balamanikandan Gunasundar 2022-10-25 16:21:05 +05:30 committed by Eugen Hristev
parent 68ddf18dc3
commit 2dc1b8fe17
6 changed files with 491 additions and 0 deletions
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2
drivers/Kconfig
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@ -62,6 +62,8 @@ source "drivers/mailbox/Kconfig"
source "drivers/memory/Kconfig"
source "drivers/mfd/Kconfig"
source "drivers/misc/Kconfig"
source "drivers/mmc/Kconfig"

1
drivers/Makefile
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@ -103,6 +103,7 @@ obj-$(CONFIG_QE) += qe/
obj-$(CONFIG_U_QE) += qe/
obj-y += mailbox/
obj-y += memory/
obj-y += mfd/
obj-y += mtd/
obj-y += pwm/
obj-y += reset/

4
drivers/mfd/Kconfig Normal file
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@ -0,0 +1,4 @@
config MFD_ATMEL_SMC
bool "Atmel Static Memory Controller driver"
help
Say yes here to support Atmel Static Memory Controller driver.

1
drivers/mfd/Makefile Normal file
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@ -0,0 +1 @@
obj-$(CONFIG_MFD_ATMEL_SMC) += atmel-smc.o

364
drivers/mfd/atmel-smc.c Normal file
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@ -0,0 +1,364 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Atmel SMC (Static Memory Controller) helper functions.
*
* Copyright (C) 2022 Microchip Technology Inc.
* Copyright (C) 2017 Free Electrons
*
* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
*/
#include <clk.h>
#include <dm/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/mfd/syscon/atmel-smc.h>
#include <linux/string.h>
/**
* atmel_smc_cs_conf_init - initialize a SMC CS conf
* @conf: the SMC CS conf to initialize
*
* Set all fields to 0 so that one can start defining a new config.
*/
void atmel_smc_cs_conf_init(struct atmel_smc_cs_conf *conf)
{
memset(conf, 0, sizeof(*conf));
}
EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_init);
/**
* atmel_smc_cs_encode_ncycles - encode a number of MCK clk cycles in the
* format expected by the SMC engine
* @ncycles: number of MCK clk cycles
* @msbpos: position of the MSB part of the timing field
* @msbwidth: width of the MSB part of the timing field
* @msbfactor: factor applied to the MSB
* @encodedval: param used to store the encoding result
*
* This function encodes the @ncycles value as described in the datasheet
* (section "SMC Setup/Pulse/Cycle/Timings Register"). This is a generic
* helper which called with different parameter depending on the encoding
* scheme.
*
* If the @ncycles value is too big to be encoded, -ERANGE is returned and
* the encodedval is contains the maximum val. Otherwise, 0 is returned.
*/
static int atmel_smc_cs_encode_ncycles(unsigned int ncycles,
unsigned int msbpos,
unsigned int msbwidth,
unsigned int msbfactor,
unsigned int *encodedval)
{
unsigned int lsbmask = GENMASK(msbpos - 1, 0);
unsigned int msbmask = GENMASK(msbwidth - 1, 0);
unsigned int msb, lsb;
int ret = 0;
msb = ncycles / msbfactor;
lsb = ncycles % msbfactor;
if (lsb > lsbmask) {
lsb = 0;
msb++;
}
/*
* Let's just put the maximum we can if the requested setting does
* not fit in the register field.
* We still return -ERANGE in case the caller cares.
*/
if (msb > msbmask) {
msb = msbmask;
lsb = lsbmask;
ret = -ERANGE;
}
*encodedval = (msb << msbpos) | lsb;
return ret;
}
/**
* atmel_smc_cs_conf_set_timing - set the SMC CS conf Txx parameter to a
* specific value
* @conf: SMC CS conf descriptor
* @shift: the position of the Txx field in the TIMINGS register
* @ncycles: value (expressed in MCK clk cycles) to assign to this Txx
* parameter
*
* This function encodes the @ncycles value as described in the datasheet
* (section "SMC Timings Register"), and then stores the result in the
* @conf->timings field at @shift position.
*
* Returns -EINVAL if shift is invalid, -ERANGE if ncycles does not fit in
* the field, and 0 otherwise.
*/
int atmel_smc_cs_conf_set_timing(struct atmel_smc_cs_conf *conf,
unsigned int shift, unsigned int ncycles)
{
unsigned int val;
int ret;
if (shift != ATMEL_HSMC_TIMINGS_TCLR_SHIFT &&
shift != ATMEL_HSMC_TIMINGS_TADL_SHIFT &&
shift != ATMEL_HSMC_TIMINGS_TAR_SHIFT &&
shift != ATMEL_HSMC_TIMINGS_TRR_SHIFT &&
shift != ATMEL_HSMC_TIMINGS_TWB_SHIFT)
return -EINVAL;
/*
* The formula described in atmel datasheets (section "HSMC Timings
* Register"):
*
* ncycles = (Txx[3] * 64) + Txx[2:0]
*/
ret = atmel_smc_cs_encode_ncycles(ncycles, 3, 1, 64, &val);
conf->timings &= ~GENMASK(shift + 3, shift);
conf->timings |= val << shift;
return ret;
}
EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_set_timing);
/**
* atmel_smc_cs_conf_set_setup - set the SMC CS conf xx_SETUP parameter to a
* specific value
* @conf: SMC CS conf descriptor
* @shift: the position of the xx_SETUP field in the SETUP register
* @ncycles: value (expressed in MCK clk cycles) to assign to this xx_SETUP
* parameter
*
* This function encodes the @ncycles value as described in the datasheet
* (section "SMC Setup Register"), and then stores the result in the
* @conf->setup field at @shift position.
*
* Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
* the field, and 0 otherwise.
*/
int atmel_smc_cs_conf_set_setup(struct atmel_smc_cs_conf *conf,
unsigned int shift, unsigned int ncycles)
{
unsigned int val;
int ret;
if (shift != ATMEL_SMC_NWE_SHIFT && shift != ATMEL_SMC_NCS_WR_SHIFT &&
shift != ATMEL_SMC_NRD_SHIFT && shift != ATMEL_SMC_NCS_RD_SHIFT)
return -EINVAL;
/*
* The formula described in atmel datasheets (section "SMC Setup
* Register"):
*
* ncycles = (128 * xx_SETUP[5]) + xx_SETUP[4:0]
*/
ret = atmel_smc_cs_encode_ncycles(ncycles, 5, 1, 128, &val);
conf->setup &= ~GENMASK(shift + 7, shift);
conf->setup |= val << shift;
return ret;
}
EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_set_setup);
/**
* atmel_smc_cs_conf_set_pulse - set the SMC CS conf xx_PULSE parameter to a
* specific value
* @conf: SMC CS conf descriptor
* @shift: the position of the xx_PULSE field in the PULSE register
* @ncycles: value (expressed in MCK clk cycles) to assign to this xx_PULSE
* parameter
*
* This function encodes the @ncycles value as described in the datasheet
* (section "SMC Pulse Register"), and then stores the result in the
* @conf->setup field at @shift position.
*
* Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
* the field, and 0 otherwise.
*/
int atmel_smc_cs_conf_set_pulse(struct atmel_smc_cs_conf *conf,
unsigned int shift, unsigned int ncycles)
{
unsigned int val;
int ret;
if (shift != ATMEL_SMC_NWE_SHIFT && shift != ATMEL_SMC_NCS_WR_SHIFT &&
shift != ATMEL_SMC_NRD_SHIFT && shift != ATMEL_SMC_NCS_RD_SHIFT)
return -EINVAL;
/*
* The formula described in atmel datasheets (section "SMC Pulse
* Register"):
*
* ncycles = (256 * xx_PULSE[6]) + xx_PULSE[5:0]
*/
ret = atmel_smc_cs_encode_ncycles(ncycles, 6, 1, 256, &val);
conf->pulse &= ~GENMASK(shift + 7, shift);
conf->pulse |= val << shift;
return ret;
}
EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_set_pulse);
/**
* atmel_smc_cs_conf_set_cycle - set the SMC CS conf xx_CYCLE parameter to a
* specific value
* @conf: SMC CS conf descriptor
* @shift: the position of the xx_CYCLE field in the CYCLE register
* @ncycles: value (expressed in MCK clk cycles) to assign to this xx_CYCLE
* parameter
*
* This function encodes the @ncycles value as described in the datasheet
* (section "SMC Cycle Register"), and then stores the result in the
* @conf->setup field at @shift position.
*
* Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
* the field, and 0 otherwise.
*/
int atmel_smc_cs_conf_set_cycle(struct atmel_smc_cs_conf *conf,
unsigned int shift, unsigned int ncycles)
{
unsigned int val;
int ret;
if (shift != ATMEL_SMC_NWE_SHIFT && shift != ATMEL_SMC_NRD_SHIFT)
return -EINVAL;
/*
* The formula described in atmel datasheets (section "SMC Cycle
* Register"):
*
* ncycles = (xx_CYCLE[8:7] * 256) + xx_CYCLE[6:0]
*/
ret = atmel_smc_cs_encode_ncycles(ncycles, 7, 2, 256, &val);
conf->cycle &= ~GENMASK(shift + 15, shift);
conf->cycle |= val << shift;
return ret;
}
EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_set_cycle);
/**
* atmel_smc_cs_conf_apply - apply an SMC CS conf
* @regmap: the SMC regmap
* @cs: the CS id
* @conf: the SMC CS conf to apply
*
* Applies an SMC CS configuration.
* Only valid on at91sam9/avr32 SoCs.
*/
void atmel_smc_cs_conf_apply(struct regmap *regmap, int cs,
const struct atmel_smc_cs_conf *conf)
{
regmap_write(regmap, ATMEL_SMC_SETUP(cs), conf->setup);
regmap_write(regmap, ATMEL_SMC_PULSE(cs), conf->pulse);
regmap_write(regmap, ATMEL_SMC_CYCLE(cs), conf->cycle);
regmap_write(regmap, ATMEL_SMC_MODE(cs), conf->mode);
}
EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_apply);
/**
* atmel_hsmc_cs_conf_apply - apply an SMC CS conf
* @regmap: the HSMC regmap
* @cs: the CS id
* @layout: the layout of registers
* @conf: the SMC CS conf to apply
*
* Applies an SMC CS configuration.
* Only valid on post-sama5 SoCs.
*/
void atmel_hsmc_cs_conf_apply(struct regmap *regmap,
const struct atmel_hsmc_reg_layout *layout,
int cs, const struct atmel_smc_cs_conf *conf)
{
regmap_write(regmap, ATMEL_HSMC_SETUP(layout, cs), conf->setup);
regmap_write(regmap, ATMEL_HSMC_PULSE(layout, cs), conf->pulse);
regmap_write(regmap, ATMEL_HSMC_CYCLE(layout, cs), conf->cycle);
regmap_write(regmap, ATMEL_HSMC_TIMINGS(layout, cs), conf->timings);
regmap_write(regmap, ATMEL_HSMC_MODE(layout, cs), conf->mode);
}
EXPORT_SYMBOL_GPL(atmel_hsmc_cs_conf_apply);
/**
* atmel_smc_cs_conf_get - retrieve the current SMC CS conf
* @regmap: the SMC regmap
* @cs: the CS id
* @conf: the SMC CS conf object to store the current conf
*
* Retrieve the SMC CS configuration.
* Only valid on at91sam9/avr32 SoCs.
*/
void atmel_smc_cs_conf_get(struct regmap *regmap, int cs,
struct atmel_smc_cs_conf *conf)
{
regmap_read(regmap, ATMEL_SMC_SETUP(cs), &conf->setup);
regmap_read(regmap, ATMEL_SMC_PULSE(cs), &conf->pulse);
regmap_read(regmap, ATMEL_SMC_CYCLE(cs), &conf->cycle);
regmap_read(regmap, ATMEL_SMC_MODE(cs), &conf->mode);
}
EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_get);
/**
* atmel_hsmc_cs_conf_get - retrieve the current SMC CS conf
* @regmap: the HSMC regmap
* @cs: the CS id
* @layout: the layout of registers
* @conf: the SMC CS conf object to store the current conf
*
* Retrieve the SMC CS configuration.
* Only valid on post-sama5 SoCs.
*/
void atmel_hsmc_cs_conf_get(struct regmap *regmap,
const struct atmel_hsmc_reg_layout *layout,
int cs, struct atmel_smc_cs_conf *conf)
{
regmap_read(regmap, ATMEL_HSMC_SETUP(layout, cs), &conf->setup);
regmap_read(regmap, ATMEL_HSMC_PULSE(layout, cs), &conf->pulse);
regmap_read(regmap, ATMEL_HSMC_CYCLE(layout, cs), &conf->cycle);
regmap_read(regmap, ATMEL_HSMC_TIMINGS(layout, cs), &conf->timings);
regmap_read(regmap, ATMEL_HSMC_MODE(layout, cs), &conf->mode);
}
EXPORT_SYMBOL_GPL(atmel_hsmc_cs_conf_get);
static const struct atmel_hsmc_reg_layout sama5d3_reg_layout = {
.timing_regs_offset = 0x600,
};
static const struct atmel_hsmc_reg_layout sama5d2_reg_layout = {
.timing_regs_offset = 0x700,
};
static const struct udevice_id atmel_smc_ids[] = {
{ .compatible = "atmel,at91sam9260-smc", .data = (ulong)0 },
{ .compatible = "atmel,sama5d3-smc", .data = (ulong)&sama5d3_reg_layout },
{ .compatible = "atmel,sama5d2-smc", .data = (ulong)&sama5d2_reg_layout },
{ /* sentinel */ },
};
/**
* atmel_hsmc_get_reg_layout - retrieve the layout of HSMC registers
* @np: the HSMC regmap
*
* Retrieve the layout of HSMC registers.
*
* Returns NULL in case of SMC, a struct atmel_hsmc_reg_layout pointer
* in HSMC case, otherwise ERR_PTR(-EINVAL).
*/
const struct atmel_hsmc_reg_layout *
atmel_hsmc_get_reg_layout(ofnode np)
{
int i;
const struct udevice_id *match;
const char *name;
int len;
name = ofnode_get_property(np, "compatible", &len);
for (i = 0; i < ARRAY_SIZE(atmel_smc_ids); i++) {
if (!strcmp(name, atmel_smc_ids[i].compatible)) {
match = &atmel_smc_ids[i];
break;
}
}
return match ? (struct atmel_hsmc_reg_layout *)match->data : ERR_PTR(-EINVAL);
}

119
include/linux/mfd/syscon/atmel-smc.h Normal file
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@ -0,0 +1,119 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* 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>
*/
#ifndef _LINUX_MFD_SYSCON_ATMEL_SMC_H_
#define _LINUX_MFD_SYSCON_ATMEL_SMC_H_
#include <linux/kernel.h>
#include <dm/ofnode.h>
#include <regmap.h>
#define ATMEL_SMC_SETUP(cs) (((cs) * 0x10))
#define ATMEL_HSMC_SETUP(layout, cs) \
((layout)->timing_regs_offset + ((cs) * 0x14))
#define ATMEL_SMC_PULSE(cs) (((cs) * 0x10) + 0x4)
#define ATMEL_HSMC_PULSE(layout, cs) \
((layout)->timing_regs_offset + ((cs) * 0x14) + 0x4)
#define ATMEL_SMC_CYCLE(cs) (((cs) * 0x10) + 0x8)
#define ATMEL_HSMC_CYCLE(layout, cs) \
((layout)->timing_regs_offset + ((cs) * 0x14) + 0x8)
#define ATMEL_SMC_NWE_SHIFT 0
#define ATMEL_SMC_NCS_WR_SHIFT 8
#define ATMEL_SMC_NRD_SHIFT 16
#define ATMEL_SMC_NCS_RD_SHIFT 24
#define ATMEL_SMC_MODE(cs) (((cs) * 0x10) + 0xc)
#define ATMEL_HSMC_MODE(layout, cs) \
((layout)->timing_regs_offset + ((cs) * 0x14) + 0x10)
#define ATMEL_SMC_MODE_READMODE_MASK BIT(0)
#define ATMEL_SMC_MODE_READMODE_NCS (0 << 0)
#define ATMEL_SMC_MODE_READMODE_NRD (1 << 0)
#define ATMEL_SMC_MODE_WRITEMODE_MASK BIT(1)
#define ATMEL_SMC_MODE_WRITEMODE_NCS (0 << 1)
#define ATMEL_SMC_MODE_WRITEMODE_NWE (1 << 1)
#define ATMEL_SMC_MODE_EXNWMODE_MASK GENMASK(5, 4)
#define ATMEL_SMC_MODE_EXNWMODE_DISABLE (0 << 4)
#define ATMEL_SMC_MODE_EXNWMODE_FROZEN (2 << 4)
#define ATMEL_SMC_MODE_EXNWMODE_READY (3 << 4)
#define ATMEL_SMC_MODE_BAT_MASK BIT(8)
#define ATMEL_SMC_MODE_BAT_SELECT (0 << 8)
#define ATMEL_SMC_MODE_BAT_WRITE (1 << 8)
#define ATMEL_SMC_MODE_DBW_MASK GENMASK(13, 12)
#define ATMEL_SMC_MODE_DBW_8 (0 << 12)
#define ATMEL_SMC_MODE_DBW_16 (1 << 12)
#define ATMEL_SMC_MODE_DBW_32 (2 << 12)
#define ATMEL_SMC_MODE_TDF_MASK GENMASK(19, 16)
#define ATMEL_SMC_MODE_TDF(x) (((x) - 1) << 16)
#define ATMEL_SMC_MODE_TDF_MAX 16
#define ATMEL_SMC_MODE_TDF_MIN 1
#define ATMEL_SMC_MODE_TDFMODE_OPTIMIZED BIT(20)
#define ATMEL_SMC_MODE_PMEN BIT(24)
#define ATMEL_SMC_MODE_PS_MASK GENMASK(29, 28)
#define ATMEL_SMC_MODE_PS_4 (0 << 28)
#define ATMEL_SMC_MODE_PS_8 (1 << 28)
#define ATMEL_SMC_MODE_PS_16 (2 << 28)
#define ATMEL_SMC_MODE_PS_32 (3 << 28)
#define ATMEL_HSMC_TIMINGS(layout, cs) \
((layout)->timing_regs_offset + ((cs) * 0x14) + 0xc)
#define ATMEL_HSMC_TIMINGS_OCMS BIT(12)
#define ATMEL_HSMC_TIMINGS_RBNSEL(x) ((x) << 28)
#define ATMEL_HSMC_TIMINGS_NFSEL BIT(31)
#define ATMEL_HSMC_TIMINGS_TCLR_SHIFT 0
#define ATMEL_HSMC_TIMINGS_TADL_SHIFT 4
#define ATMEL_HSMC_TIMINGS_TAR_SHIFT 8
#define ATMEL_HSMC_TIMINGS_TRR_SHIFT 16
#define ATMEL_HSMC_TIMINGS_TWB_SHIFT 24
struct atmel_hsmc_reg_layout {
unsigned int timing_regs_offset;
};
/**
* struct atmel_smc_cs_conf - SMC CS config as described in the datasheet.
* @setup: NCS/NWE/NRD setup timings (not applicable to at91rm9200)
* @pulse: NCS/NWE/NRD pulse timings (not applicable to at91rm9200)
* @cycle: NWE/NRD cycle timings (not applicable to at91rm9200)
* @timings: advanced NAND related timings (only applicable to HSMC)
* @mode: all kind of config parameters (see the fields definition above).
* The mode fields are different on at91rm9200
*/
struct atmel_smc_cs_conf {
u32 setup;
u32 pulse;
u32 cycle;
u32 timings;
u32 mode;
};
void atmel_smc_cs_conf_init(struct atmel_smc_cs_conf *conf);
int atmel_smc_cs_conf_set_timing(struct atmel_smc_cs_conf *conf,
unsigned int shift,
unsigned int ncycles);
int atmel_smc_cs_conf_set_setup(struct atmel_smc_cs_conf *conf,
unsigned int shift, unsigned int ncycles);
int atmel_smc_cs_conf_set_pulse(struct atmel_smc_cs_conf *conf,
unsigned int shift, unsigned int ncycles);
int atmel_smc_cs_conf_set_cycle(struct atmel_smc_cs_conf *conf,
unsigned int shift, unsigned int ncycles);
void atmel_smc_cs_conf_apply(struct regmap *regmap, int cs,
const struct atmel_smc_cs_conf *conf);
void atmel_hsmc_cs_conf_apply(struct regmap *regmap,
const struct atmel_hsmc_reg_layout *reglayout,
int cs, const struct atmel_smc_cs_conf *conf);
void atmel_smc_cs_conf_get(struct regmap *regmap, int cs,
struct atmel_smc_cs_conf *conf);
void atmel_hsmc_cs_conf_get(struct regmap *regmap,
const struct atmel_hsmc_reg_layout *reglayout,
int cs, struct atmel_smc_cs_conf *conf);
const struct atmel_hsmc_reg_layout *
atmel_hsmc_get_reg_layout(ofnode np);
#endif /* _LINUX_MFD_SYSCON_ATMEL_SMC_H_ */