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linux/drivers/pinctrl/pinctrl-pef2256.c
Herve Codina 37c646dc51 pinctrl: Add support for the Lantic PEF2256 pinmux 
The Lantiq PEF2256 is a framer and line interface component designed to
fulfill all required interfacing between an analog E1/T1/J1 line and the
digital PCM system highway/H.100 bus.

This kind of component can be found in old telecommunication system.
It was used to digital transmission of many simultaneous telephone calls
by time-division multiplexing. Also using HDLC protocol, WAN networks
can be reached through the framer.

This pinmux support handles the pin muxing part (pins RP(A..D) and pins
XP(A..D)) of the PEF2256.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231128132534.258459-5-herve.codina@bootlin.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2023-12-12 23:05:24 +01:00

359 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* PEF2256 also known as FALC56 driver
*
* Copyright 2023 CS GROUP France
*
* Author: Herve Codina <herve.codina@bootlin.com>
*/
#include <linux/bitfield.h>
#include <linux/framer/pef2256.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
/* Port Configuration 1..4 */
#define PEF2256_PC1 0x80
#define PEF2256_PC2 0x81
#define PEF2256_PC3 0x82
#define PEF2256_PC4 0x83
#define PEF2256_12_PC_RPC_MASK GENMASK(6, 4)
#define PEF2256_12_PC_RPC_SYPR FIELD_PREP_CONST(PEF2256_12_PC_RPC_MASK, 0x0)
#define PEF2256_12_PC_RPC_RFM FIELD_PREP_CONST(PEF2256_12_PC_RPC_MASK, 0x1)
#define PEF2256_12_PC_RPC_RFMB FIELD_PREP_CONST(PEF2256_12_PC_RPC_MASK, 0x2)
#define PEF2256_12_PC_RPC_RSIGM FIELD_PREP_CONST(PEF2256_12_PC_RPC_MASK, 0x3)
#define PEF2256_12_PC_RPC_RSIG FIELD_PREP_CONST(PEF2256_12_PC_RPC_MASK, 0x4)
#define PEF2256_12_PC_RPC_DLR FIELD_PREP_CONST(PEF2256_12_PC_RPC_MASK, 0x5)
#define PEF2256_12_PC_RPC_FREEZE FIELD_PREP_CONST(PEF2256_12_PC_RPC_MASK, 0x6)
#define PEF2256_12_PC_RPC_RFSP FIELD_PREP_CONST(PEF2256_12_PC_RPC_MASK, 0x7)
#define PEF2256_12_PC_XPC_MASK GENMASK(4, 0)
#define PEF2256_12_PC_XPC_SYPX FIELD_PREP_CONST(PEF2256_12_PC_XPC_MASK, 0x0)
#define PEF2256_12_PC_XPC_XFMS FIELD_PREP_CONST(PEF2256_12_PC_XPC_MASK, 0x1)
#define PEF2256_12_PC_XPC_XSIG FIELD_PREP_CONST(PEF2256_12_PC_XPC_MASK, 0x2)
#define PEF2256_12_PC_XPC_TCLK FIELD_PREP_CONST(PEF2256_12_PC_XPC_MASK, 0x3)
#define PEF2256_12_PC_XPC_XMFB FIELD_PREP_CONST(PEF2256_12_PC_XPC_MASK, 0x4)
#define PEF2256_12_PC_XPC_XSIGM FIELD_PREP_CONST(PEF2256_12_PC_XPC_MASK, 0x5)
#define PEF2256_12_PC_XPC_DLX FIELD_PREP_CONST(PEF2256_12_PC_XPC_MASK, 0x6)
#define PEF2256_12_PC_XPC_XCLK FIELD_PREP_CONST(PEF2256_12_PC_XPC_MASK, 0x7)
#define PEF2256_12_PC_XPC_XLT FIELD_PREP_CONST(PEF2256_12_PC_XPC_MASK, 0x8)
#define PEF2256_2X_PC_RPC_MASK GENMASK(7, 4)
#define PEF2256_2X_PC_RPC_SYPR FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0x0)
#define PEF2256_2X_PC_RPC_RFM FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0x1)
#define PEF2256_2X_PC_RPC_RFMB FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0x2)
#define PEF2256_2X_PC_RPC_RSIGM FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0x3)
#define PEF2256_2X_PC_RPC_RSIG FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0x4)
#define PEF2256_2X_PC_RPC_DLR FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0x5)
#define PEF2256_2X_PC_RPC_FREEZE FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0x6)
#define PEF2256_2X_PC_RPC_RFSP FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0x7)
#define PEF2256_2X_PC_RPC_GPI FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0x9)
#define PEF2256_2X_PC_RPC_GPOH FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0xa)
#define PEF2256_2X_PC_RPC_GPOL FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0xb)
#define PEF2256_2X_PC_RPC_LOS FIELD_PREP_CONST(PEF2256_2X_PC_RPC_MASK, 0xc)
#define PEF2256_2X_PC_XPC_MASK GENMASK(3, 0)
#define PEF2256_2X_PC_XPC_SYPX FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0x0)
#define PEF2256_2X_PC_XPC_XFMS FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0x1)
#define PEF2256_2X_PC_XPC_XSIG FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0x2)
#define PEF2256_2X_PC_XPC_TCLK FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0x3)
#define PEF2256_2X_PC_XPC_XMFB FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0x4)
#define PEF2256_2X_PC_XPC_XSIGM FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0x5)
#define PEF2256_2X_PC_XPC_DLX FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0x6)
#define PEF2256_2X_PC_XPC_XCLK FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0x7)
#define PEF2256_2X_PC_XPC_XLT FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0x8)
#define PEF2256_2X_PC_XPC_GPI FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0x9)
#define PEF2256_2X_PC_XPC_GPOH FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0xa)
#define PEF2256_2X_PC_XPC_GPOL FIELD_PREP_CONST(PEF2256_2X_PC_XPC_MASK, 0xb)
struct pef2256_pinreg_desc {
int offset;
u8 mask;
};
struct pef2256_function_desc {
const char *name;
const char * const*groups;
unsigned int ngroups;
u8 func_val;
};
struct pef2256_pinctrl {
struct device *dev;
struct regmap *regmap;
enum pef2256_version version;
struct pinctrl_desc pctrl_desc;
const struct pef2256_function_desc *functions;
unsigned int nfunctions;
};
static int pef2256_get_groups_count(struct pinctrl_dev *pctldev)
{
struct pef2256_pinctrl *pef2256 = pinctrl_dev_get_drvdata(pctldev);
/* We map 1 group <-> 1 pin */
return pef2256->pctrl_desc.npins;
}
static const char *pef2256_get_group_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct pef2256_pinctrl *pef2256 = pinctrl_dev_get_drvdata(pctldev);
/* We map 1 group <-> 1 pin */
return pef2256->pctrl_desc.pins[selector].name;
}
static int pef2256_get_group_pins(struct pinctrl_dev *pctldev, unsigned int selector,
const unsigned int **pins,
unsigned int *num_pins)
{
struct pef2256_pinctrl *pef2256 = pinctrl_dev_get_drvdata(pctldev);
/* We map 1 group <-> 1 pin */
*pins = &pef2256->pctrl_desc.pins[selector].number;
*num_pins = 1;
return 0;
}
static const struct pinctrl_ops pef2256_pctlops = {
.get_groups_count = pef2256_get_groups_count,
.get_group_name = pef2256_get_group_name,
.get_group_pins = pef2256_get_group_pins,
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.dt_free_map = pinconf_generic_dt_free_map,
};
static int pef2256_get_functions_count(struct pinctrl_dev *pctldev)
{
struct pef2256_pinctrl *pef2256 = pinctrl_dev_get_drvdata(pctldev);
return pef2256->nfunctions;
}
static const char *pef2256_get_function_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct pef2256_pinctrl *pef2256 = pinctrl_dev_get_drvdata(pctldev);
return pef2256->functions[selector].name;
}
static int pef2256_get_function_groups(struct pinctrl_dev *pctldev, unsigned int selector,
const char * const **groups,
unsigned * const num_groups)
{
struct pef2256_pinctrl *pef2256 = pinctrl_dev_get_drvdata(pctldev);
*groups = pef2256->functions[selector].groups;
*num_groups = pef2256->functions[selector].ngroups;
return 0;
}
static int pef2256_set_mux(struct pinctrl_dev *pctldev, unsigned int func_selector,
unsigned int group_selector)
{
struct pef2256_pinctrl *pef2256 = pinctrl_dev_get_drvdata(pctldev);
const struct pef2256_pinreg_desc *pinreg_desc;
u8 func_val;
/* We map 1 group <-> 1 pin */
pinreg_desc = pef2256->pctrl_desc.pins[group_selector].drv_data;
func_val = pef2256->functions[func_selector].func_val;
return regmap_update_bits(pef2256->regmap, pinreg_desc->offset,
pinreg_desc->mask, func_val);
}
static const struct pinmux_ops pef2256_pmxops = {
.get_functions_count = pef2256_get_functions_count,
.get_function_name = pef2256_get_function_name,
.get_function_groups = pef2256_get_function_groups,
.set_mux = pef2256_set_mux,
};
#define PEF2256_PINCTRL_PIN(_number, _name, _offset, _mask) { \
.number = _number, \
.name = _name, \
.drv_data = &(struct pef2256_pinreg_desc) { \
.offset = _offset, \
.mask = _mask, \
}, \
}
static const struct pinctrl_pin_desc pef2256_v12_pins[] = {
PEF2256_PINCTRL_PIN(0, "RPA", PEF2256_PC1, PEF2256_12_PC_RPC_MASK),
PEF2256_PINCTRL_PIN(1, "RPB", PEF2256_PC2, PEF2256_12_PC_RPC_MASK),
PEF2256_PINCTRL_PIN(2, "RPC", PEF2256_PC3, PEF2256_12_PC_RPC_MASK),
PEF2256_PINCTRL_PIN(3, "RPD", PEF2256_PC4, PEF2256_12_PC_RPC_MASK),
PEF2256_PINCTRL_PIN(4, "XPA", PEF2256_PC1, PEF2256_12_PC_XPC_MASK),
PEF2256_PINCTRL_PIN(5, "XPB", PEF2256_PC2, PEF2256_12_PC_XPC_MASK),
PEF2256_PINCTRL_PIN(6, "XPC", PEF2256_PC3, PEF2256_12_PC_XPC_MASK),
PEF2256_PINCTRL_PIN(7, "XPD", PEF2256_PC4, PEF2256_12_PC_XPC_MASK),
};
static const struct pinctrl_pin_desc pef2256_v2x_pins[] = {
PEF2256_PINCTRL_PIN(0, "RPA", PEF2256_PC1, PEF2256_2X_PC_RPC_MASK),
PEF2256_PINCTRL_PIN(1, "RPB", PEF2256_PC2, PEF2256_2X_PC_RPC_MASK),
PEF2256_PINCTRL_PIN(2, "RPC", PEF2256_PC3, PEF2256_2X_PC_RPC_MASK),
PEF2256_PINCTRL_PIN(3, "RPD", PEF2256_PC4, PEF2256_2X_PC_RPC_MASK),
PEF2256_PINCTRL_PIN(4, "XPA", PEF2256_PC1, PEF2256_2X_PC_XPC_MASK),
PEF2256_PINCTRL_PIN(5, "XPB", PEF2256_PC2, PEF2256_2X_PC_XPC_MASK),
PEF2256_PINCTRL_PIN(6, "XPC", PEF2256_PC3, PEF2256_2X_PC_XPC_MASK),
PEF2256_PINCTRL_PIN(7, "XPD", PEF2256_PC4, PEF2256_2X_PC_XPC_MASK),
};
static const char *const pef2256_rp_groups[] = { "RPA", "RPB", "RPC", "RPD" };
static const char *const pef2256_xp_groups[] = { "XPA", "XPB", "XPC", "XPD" };
static const char *const pef2256_all_groups[] = { "RPA", "RPB", "RPC", "RPD",
"XPA", "XPB", "XPC", "XPD" };
#define PEF2256_FUNCTION(_name, _func_val, _groups) { \
.name = _name, \
.groups = _groups, \
.ngroups = ARRAY_SIZE(_groups), \
.func_val = _func_val, \
}
static const struct pef2256_function_desc pef2256_v2x_functions[] = {
PEF2256_FUNCTION("SYPR", PEF2256_2X_PC_RPC_SYPR, pef2256_rp_groups),
PEF2256_FUNCTION("RFM", PEF2256_2X_PC_RPC_RFM, pef2256_rp_groups),
PEF2256_FUNCTION("RFMB", PEF2256_2X_PC_RPC_RFMB, pef2256_rp_groups),
PEF2256_FUNCTION("RSIGM", PEF2256_2X_PC_RPC_RSIGM, pef2256_rp_groups),
PEF2256_FUNCTION("RSIG", PEF2256_2X_PC_RPC_RSIG, pef2256_rp_groups),
PEF2256_FUNCTION("DLR", PEF2256_2X_PC_RPC_DLR, pef2256_rp_groups),
PEF2256_FUNCTION("FREEZE", PEF2256_2X_PC_RPC_FREEZE, pef2256_rp_groups),
PEF2256_FUNCTION("RFSP", PEF2256_2X_PC_RPC_RFSP, pef2256_rp_groups),
PEF2256_FUNCTION("LOS", PEF2256_2X_PC_RPC_LOS, pef2256_rp_groups),
PEF2256_FUNCTION("SYPX", PEF2256_2X_PC_XPC_SYPX, pef2256_xp_groups),
PEF2256_FUNCTION("XFMS", PEF2256_2X_PC_XPC_XFMS, pef2256_xp_groups),
PEF2256_FUNCTION("XSIG", PEF2256_2X_PC_XPC_XSIG, pef2256_xp_groups),
PEF2256_FUNCTION("TCLK", PEF2256_2X_PC_XPC_TCLK, pef2256_xp_groups),
PEF2256_FUNCTION("XMFB", PEF2256_2X_PC_XPC_XMFB, pef2256_xp_groups),
PEF2256_FUNCTION("XSIGM", PEF2256_2X_PC_XPC_XSIGM, pef2256_xp_groups),
PEF2256_FUNCTION("DLX", PEF2256_2X_PC_XPC_DLX, pef2256_xp_groups),
PEF2256_FUNCTION("XCLK", PEF2256_2X_PC_XPC_XCLK, pef2256_xp_groups),
PEF2256_FUNCTION("XLT", PEF2256_2X_PC_XPC_XLT, pef2256_xp_groups),
PEF2256_FUNCTION("GPI", PEF2256_2X_PC_RPC_GPI | PEF2256_2X_PC_XPC_GPI,
pef2256_all_groups),
PEF2256_FUNCTION("GPOH", PEF2256_2X_PC_RPC_GPOH | PEF2256_2X_PC_XPC_GPOH,
pef2256_all_groups),
PEF2256_FUNCTION("GPOL", PEF2256_2X_PC_RPC_GPOL | PEF2256_2X_PC_XPC_GPOL,
pef2256_all_groups),
};
static const struct pef2256_function_desc pef2256_v12_functions[] = {
PEF2256_FUNCTION("SYPR", PEF2256_12_PC_RPC_SYPR, pef2256_rp_groups),
PEF2256_FUNCTION("RFM", PEF2256_12_PC_RPC_RFM, pef2256_rp_groups),
PEF2256_FUNCTION("RFMB", PEF2256_12_PC_RPC_RFMB, pef2256_rp_groups),
PEF2256_FUNCTION("RSIGM", PEF2256_12_PC_RPC_RSIGM, pef2256_rp_groups),
PEF2256_FUNCTION("RSIG", PEF2256_12_PC_RPC_RSIG, pef2256_rp_groups),
PEF2256_FUNCTION("DLR", PEF2256_12_PC_RPC_DLR, pef2256_rp_groups),
PEF2256_FUNCTION("FREEZE", PEF2256_12_PC_RPC_FREEZE, pef2256_rp_groups),
PEF2256_FUNCTION("RFSP", PEF2256_12_PC_RPC_RFSP, pef2256_rp_groups),
PEF2256_FUNCTION("SYPX", PEF2256_12_PC_XPC_SYPX, pef2256_xp_groups),
PEF2256_FUNCTION("XFMS", PEF2256_12_PC_XPC_XFMS, pef2256_xp_groups),
PEF2256_FUNCTION("XSIG", PEF2256_12_PC_XPC_XSIG, pef2256_xp_groups),
PEF2256_FUNCTION("TCLK", PEF2256_12_PC_XPC_TCLK, pef2256_xp_groups),
PEF2256_FUNCTION("XMFB", PEF2256_12_PC_XPC_XMFB, pef2256_xp_groups),
PEF2256_FUNCTION("XSIGM", PEF2256_12_PC_XPC_XSIGM, pef2256_xp_groups),
PEF2256_FUNCTION("DLX", PEF2256_12_PC_XPC_DLX, pef2256_xp_groups),
PEF2256_FUNCTION("XCLK", PEF2256_12_PC_XPC_XCLK, pef2256_xp_groups),
PEF2256_FUNCTION("XLT", PEF2256_12_PC_XPC_XLT, pef2256_xp_groups),
};
static int pef2256_register_pinctrl(struct pef2256_pinctrl *pef2256)
{
struct pinctrl_dev *pctrl;
pef2256->pctrl_desc.name = dev_name(pef2256->dev);
pef2256->pctrl_desc.owner = THIS_MODULE;
pef2256->pctrl_desc.pctlops = &pef2256_pctlops;
pef2256->pctrl_desc.pmxops = &pef2256_pmxops;
if (pef2256->version == PEF2256_VERSION_1_2) {
pef2256->pctrl_desc.pins = pef2256_v12_pins;
pef2256->pctrl_desc.npins = ARRAY_SIZE(pef2256_v12_pins);
pef2256->functions = pef2256_v12_functions;
pef2256->nfunctions = ARRAY_SIZE(pef2256_v12_functions);
} else {
pef2256->pctrl_desc.pins = pef2256_v2x_pins;
pef2256->pctrl_desc.npins = ARRAY_SIZE(pef2256_v2x_pins);
pef2256->functions = pef2256_v2x_functions;
pef2256->nfunctions = ARRAY_SIZE(pef2256_v2x_functions);
}
pctrl = devm_pinctrl_register(pef2256->dev, &pef2256->pctrl_desc, pef2256);
if (IS_ERR(pctrl))
return dev_err_probe(pef2256->dev, PTR_ERR(pctrl),
"pinctrl driver registration failed\n");
return 0;
}
static void pef2256_reset_pinmux(struct pef2256_pinctrl *pef2256)
{
u8 val;
/*
* Reset values cannot be used.
* They define the SYPR/SYPX pin mux for all the RPx and XPx pins and
* Only one pin can be muxed to SYPR and one pin can be muxed to SYPX.
* Choose here an other reset value.
*/
if (pef2256->version == PEF2256_VERSION_1_2)
val = PEF2256_12_PC_XPC_XCLK | PEF2256_12_PC_RPC_RFSP;
else
val = PEF2256_2X_PC_XPC_GPI | PEF2256_2X_PC_RPC_GPI;
regmap_write(pef2256->regmap, PEF2256_PC1, val);
regmap_write(pef2256->regmap, PEF2256_PC2, val);
regmap_write(pef2256->regmap, PEF2256_PC3, val);
regmap_write(pef2256->regmap, PEF2256_PC4, val);
}
static int pef2256_pinctrl_probe(struct platform_device *pdev)
{
struct pef2256_pinctrl *pef2256_pinctrl;
struct pef2256 *pef2256;
int ret;
pef2256_pinctrl = devm_kzalloc(&pdev->dev, sizeof(*pef2256_pinctrl), GFP_KERNEL);
if (!pef2256_pinctrl)
return -ENOMEM;
device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
pef2256 = dev_get_drvdata(pdev->dev.parent);
pef2256_pinctrl->dev = &pdev->dev;
pef2256_pinctrl->regmap = pef2256_get_regmap(pef2256);
pef2256_pinctrl->version = pef2256_get_version(pef2256);
platform_set_drvdata(pdev, pef2256_pinctrl);
pef2256_reset_pinmux(pef2256_pinctrl);
ret = pef2256_register_pinctrl(pef2256_pinctrl);
if (ret)
return ret;
return 0;
}
static struct platform_driver pef2256_pinctrl_driver = {
.driver = {
.name = "lantiq-pef2256-pinctrl",
},
.probe = pef2256_pinctrl_probe,
};
module_platform_driver(pef2256_pinctrl_driver);
MODULE_AUTHOR("Herve Codina <herve.codina@bootlin.com>");
MODULE_DESCRIPTION("PEF2256 pin controller driver");
MODULE_LICENSE("GPL");
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