Re: [PATCH v2 23/28] net: wan: framer: Add support for the Lantiq PEF2256 framer

From: Christophe Leroy
Date: Tue Aug 08 2023 - 11:49:07 EST

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Le 26/07/2023 à 17:02, Herve Codina a écrit :
> 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.
>
> Signed-off-by: Herve Codina <herve.codina@xxxxxxxxxxx>

Reviewed-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>

> ---
> drivers/net/wan/framer/Kconfig | 16 +
> drivers/net/wan/framer/Makefile | 1 +
> drivers/net/wan/framer/pef2256/Makefile | 8 +
> drivers/net/wan/framer/pef2256/pef2256-regs.h | 250 +++++
> drivers/net/wan/framer/pef2256/pef2256.c | 880 ++++++++++++++++++
> include/linux/framer/pef2256.h | 31 +
> 6 files changed, 1186 insertions(+)
> create mode 100644 drivers/net/wan/framer/pef2256/Makefile
> create mode 100644 drivers/net/wan/framer/pef2256/pef2256-regs.h
> create mode 100644 drivers/net/wan/framer/pef2256/pef2256.c
> create mode 100644 include/linux/framer/pef2256.h
>
> diff --git a/drivers/net/wan/framer/Kconfig b/drivers/net/wan/framer/Kconfig
> index 96ef1e7ba8eb..ba43d7f162a2 100644
> --- a/drivers/net/wan/framer/Kconfig
> +++ b/drivers/net/wan/framer/Kconfig
> @@ -16,4 +16,20 @@ config GENERIC_FRAMER
> framework and framer users can obtain reference to the framer.
> All the users of this framework should select this config.
>
> +config FRAMER_PEF2256
> + tristate "Lantiq PEF2256"
> + depends on OF
> + select GENERIC_FRAMER
> + select MFD_CORE
> + select REGMAP_MMIO
> + help
> + Enable support for the Lantiq PEF2256 (FALC56) framer.
> + The PEF2256 is a framer and line interface between analog E1/T1/J1
> + line and a digital PCM bus.
> +
> + If unsure, say N.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called framer-pef2256.
> +
> endmenu
> diff --git a/drivers/net/wan/framer/Makefile b/drivers/net/wan/framer/Makefile
> index 78dbd8e563d0..3403f2b14534 100644
> --- a/drivers/net/wan/framer/Makefile
> +++ b/drivers/net/wan/framer/Makefile
> @@ -4,3 +4,4 @@
> #
>
> obj-$(CONFIG_GENERIC_FRAMER) += framer-core.o
> +obj-$(CONFIG_FRAMER_PEF2256) += pef2256/
> diff --git a/drivers/net/wan/framer/pef2256/Makefile b/drivers/net/wan/framer/pef2256/Makefile
> new file mode 100644
> index 000000000000..f4d1208dd8a4
> --- /dev/null
> +++ b/drivers/net/wan/framer/pef2256/Makefile
> @@ -0,0 +1,8 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Makefile for the pef2256 driver.
> +#
> +
> +obj-$(CONFIG_FRAMER_PEF2256) += framer-pef2256.o
> +
> +framer-pef2256-objs := pef2256.o
> diff --git a/drivers/net/wan/framer/pef2256/pef2256-regs.h b/drivers/net/wan/framer/pef2256/pef2256-regs.h
> new file mode 100644
> index 000000000000..5d3183c91714
> --- /dev/null
> +++ b/drivers/net/wan/framer/pef2256/pef2256-regs.h
> @@ -0,0 +1,250 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * PEF2256 registers definition
> + *
> + * Copyright 2023 CS GROUP France
> + *
> + * Author: Herve Codina <herve.codina@xxxxxxxxxxx>
> + */
> +#ifndef __PEF2256_REGS_H__
> +#define __PEF2256_REGS_H__
> +
> +#include "linux/bitfield.h"
> +
> +/* Command Register */
> +#define PEF2256_CMDR 0x02
> +#define PEF2256_CMDR_RRES BIT(6)
> +#define PEF2256_CMDR_XRES BIT(4)
> +#define PEF2256_CMDR_SRES BIT(0)
> +
> +/* Interrupt Mask Register 0..5 */
> +#define PEF2256_IMR0 0x14
> +#define PEF2256_IMR1 0x15
> +#define PEF2256_IMR2 0x16
> +#define PEF2256_IMR3 0x17
> +#define PEF2256_IMR4 0x18
> +#define PEF2256_IMR5 0x19
> +
> +/* Framer Mode Register 0 */
> +#define PEF2256_FMR0 0x1C
> +#define PEF2256_FMR0_XC_MASK GENMASK(7, 6)
> +#define PEF2256_FMR0_XC_NRZ FIELD_PREP_CONST(PEF2256_FMR0_XC_MASK, 0x0)
> +#define PEF2256_FMR0_XC_CMI FIELD_PREP_CONST(PEF2256_FMR0_XC_MASK, 0x1)
> +#define PEF2256_FMR0_XC_AMI FIELD_PREP_CONST(PEF2256_FMR0_XC_MASK, 0x2)
> +#define PEF2256_FMR0_XC_HDB3 FIELD_PREP_CONST(PEF2256_FMR0_XC_MASK, 0x3)
> +#define PEF2256_FMR0_RC_MASK GENMASK(5, 4)
> +#define PEF2256_FMR0_RC_NRZ FIELD_PREP_CONST(PEF2256_FMR0_RC_MASK, 0x0)
> +#define PEF2256_FMR0_RC_CMI FIELD_PREP_CONST(PEF2256_FMR0_RC_MASK, 0x1)
> +#define PEF2256_FMR0_RC_AMI FIELD_PREP_CONST(PEF2256_FMR0_RC_MASK, 0x2)
> +#define PEF2256_FMR0_RC_HDB3 FIELD_PREP_CONST(PEF2256_FMR0_RC_MASK, 0x3)
> +
> +/* Framer Mode Register 1 */
> +#define PEF2256_FMR1 0x1D
> +#define PEF2256_FMR1_XFS BIT(3)
> +#define PEF2256_FMR1_ECM BIT(2)
> +/* SSD is defined on 2 bits. The other bit is on SIC1 register */
> +#define PEF2256_FMR1_SSD_MASK GENMASK(1, 1)
> +#define PEF2256_FMR1_SSD_2048 FIELD_PREP_CONST(PEF2256_FMR1_SSD_MASK, 0x0)
> +#define PEF2256_FMR1_SSD_4096 FIELD_PREP_CONST(PEF2256_FMR1_SSD_MASK, 0x1)
> +#define PEF2256_FMR1_SSD_8192 FIELD_PREP_CONST(PEF2256_FMR1_SSD_MASK, 0x0)
> +#define PEF2256_FMR1_SSD_16384 FIELD_PREP_CONST(PEF2256_FMR1_SSD_MASK, 0x1)
> +
> +/* Framer Mode Register 2 */
> +#define PEF2256_FMR2 0x1E
> +#define PEF2256_FMR2_RFS_MASK GENMASK(7, 6)
> +#define PEF2256_FMR2_RFS_DOUBLEFRAME FIELD_PREP_CONST(PEF2256_FMR2_RFS_MASK, 0x0)
> +#define PEF2256_FMR2_RFS_CRC4_MULTIFRAME FIELD_PREP_CONST(PEF2256_FMR2_RFS_MASK, 0x2)
> +#define PEF2256_FMR2_RFS_AUTO_MULTIFRAME FIELD_PREP_CONST(PEF2256_FMR2_RFS_MASK, 0x3)
> +#define PEF2256_FMR2_AXRA BIT(1)
> +
> +/* Transmit Service Word */
> +#define PEF2256_XSW 0x20
> +#define PEF2256_XSW_XSIS BIT(7)
> +#define PEF2256_XSW_XTM BIT(6)
> +#define PEF2256_XSW_XY_MASK GENMASK(5, 0)
> +#define PEF2256_XSW_XY(_v) FIELD_PREP(PEF2256_XSW_XY_MASK, _v)
> +
> +/* Transmit Spare Bits */
> +#define PEF2256_XSP 0x21
> +#define PEF2256_XSP_XSIF BIT(2)
> +
> +/* Transmit Control 0..1 */
> +#define PEF2256_XC0 0x22
> +#define PEF2256_XC1 0x23
> +
> +/* Receive Control 0 */
> +#define PEF2256_RC0 0x24
> +#define PEF2256_RC0_SWD BIT(7)
> +#define PEF2256_RC0_ASY4 BIT(6)
> +
> +/* Receive Control 1 */
> +#define PEF2256_RC1 0x25
> +
> +/* Transmit Pulse Mask 0..1 */
> +#define PEF2256_XPM0 0x26
> +#define PEF2256_XPM1 0x27
> +
> +/* Transmit Pulse Mask 2 */
> +#define PEF2256_XPM2 0x28
> +#define PEF2256_XPM2_XLT BIT(6)
> +
> +/* Transparent Service Word Mask */
> +#define PEF2256_TSWM 0x29
> +
> +/* Line Interface Mode 0 */
> +#define PEF2256_LIM0 0x36
> +#define PEF2256_2X_LIM0_BIT3 BIT(3) /* v2.x, described as a forced '1' bit */
> +#define PEF2256_LIM0_MAS BIT(0)
> +
> +/* Line Interface Mode 1 */
> +#define PEF2256_LIM1 0x37
> +#define PEF2256_12_LIM1_RIL_MASK GENMASK(6, 4)
> +#define PEF2256_12_LIM1_RIL_910 FIELD_PREP_CONST(PEF2256_12_LIM1_RIL_MASK, 0x0)
> +#define PEF2256_12_LIM1_RIL_740 FIELD_PREP_CONST(PEF2256_12_LIM1_RIL_MASK, 0x1)
> +#define PEF2256_12_LIM1_RIL_590 FIELD_PREP_CONST(PEF2256_12_LIM1_RIL_MASK, 0x2)
> +#define PEF2256_12_LIM1_RIL_420 FIELD_PREP_CONST(PEF2256_12_LIM1_RIL_MASK, 0x3)
> +#define PEF2256_12_LIM1_RIL_320 FIELD_PREP_CONST(PEF2256_12_LIM1_RIL_MASK, 0x4)
> +#define PEF2256_12_LIM1_RIL_210 FIELD_PREP_CONST(PEF2256_12_LIM1_RIL_MASK, 0x5)
> +#define PEF2256_12_LIM1_RIL_160 FIELD_PREP_CONST(PEF2256_12_LIM1_RIL_MASK, 0x6)
> +#define PEF2256_12_LIM1_RIL_100 FIELD_PREP_CONST(PEF2256_12_LIM1_RIL_MASK, 0x7)
> +#define PEF2256_2X_LIM1_RIL_MASK GENMASK(6, 4)
> +#define PEF2256_2X_LIM1_RIL_2250 FIELD_PREP_CONST(PEF2256_2X_LIM1_RIL_MASK, 0x0)
> +#define PEF2256_2X_LIM1_RIL_1100 FIELD_PREP_CONST(PEF2256_2X_LIM1_RIL_MASK, 0x1)
> +#define PEF2256_2X_LIM1_RIL_600 FIELD_PREP_CONST(PEF2256_2X_LIM1_RIL_MASK, 0x2)
> +#define PEF2256_2X_LIM1_RIL_350 FIELD_PREP_CONST(PEF2256_2X_LIM1_RIL_MASK, 0x3)
> +#define PEF2256_2X_LIM1_RIL_210 FIELD_PREP_CONST(PEF2256_2X_LIM1_RIL_MASK, 0x4)
> +#define PEF2256_2X_LIM1_RIL_140 FIELD_PREP_CONST(PEF2256_2X_LIM1_RIL_MASK, 0x5)
> +#define PEF2256_2X_LIM1_RIL_100 FIELD_PREP_CONST(PEF2256_2X_LIM1_RIL_MASK, 0x6)
> +#define PEF2256_2X_LIM1_RIL_50 FIELD_PREP_CONST(PEF2256_2X_LIM1_RIL_MASK, 0x7)
> +
> +/* Pulse Count Detection */
> +#define PEF2256_PCD 0x38
> +
> + /* Pulse Count Recovery */
> +#define PEF2256_PCR 0x39
> +
> + /* Line Interface Mode 2 */
> +#define PEF2256_LIM2 0x3A
> +#define PEF2256_LIM2_SLT_MASK GENMASK(5, 4)
> +#define PEF2256_LIM2_SLT_THR55 FIELD_PREP_CONST(PEF2256_LIM2_SLT_MASK, 0x0)
> +#define PEF2256_LIM2_SLT_THR67 FIELD_PREP_CONST(PEF2256_LIM2_SLT_MASK, 0x1)
> +#define PEF2256_LIM2_SLT_THR50 FIELD_PREP_CONST(PEF2256_LIM2_SLT_MASK, 0x2)
> +#define PEF2256_LIM2_SLT_THR45 FIELD_PREP_CONST(PEF2256_LIM2_SLT_MASK, 0x3)
> +#define PEF2256_LIM2_ELT BIT(2)
> +
> +/* System Interface Control 1 */
> +#define PEF2256_SIC1 0x3E
> +#define PEF2256_SIC1_SSC_MASK (BIT(7) | BIT(3))
> +#define PEF2256_SIC1_SSC_2048 (0)
> +#define PEF2256_SIC1_SSC_4096 BIT(3)
> +#define PEF2256_SIC1_SSC_8192 BIT(7)
> +#define PEF2256_SIC1_SSC_16384 (BIT(7) | BIT(3))
> +/* SSD is defined on 2 bits. The other bit is on FMR1 register */
> +#define PEF2256_SIC1_SSD_MASK GENMASK(6, 6)
> +#define PEF2256_SIC1_SSD_2048 FIELD_PREP_CONST(PEF2256_SIC1_SSD_MASK, 0x0)
> +#define PEF2256_SIC1_SSD_4096 FIELD_PREP_CONST(PEF2256_SIC1_SSD_MASK, 0x0)
> +#define PEF2256_SIC1_SSD_8192 FIELD_PREP_CONST(PEF2256_SIC1_SSD_MASK, 0x1)
> +#define PEF2256_SIC1_SSD_16384 FIELD_PREP_CONST(PEF2256_SIC1_SSD_MASK, 0x1)
> +#define PEF2256_SIC1_RBS_MASK GENMASK(5, 4)
> +#define PEF2256_SIC1_RBS_2FRAMES FIELD_PREP_CONST(PEF2256_SIC1_RBS_MASK, 0x0)
> +#define PEF2256_SIC1_RBS_1FRAME FIELD_PREP_CONST(PEF2256_SIC1_RBS_MASK, 0x1)
> +#define PEF2256_SIC1_RBS_96BITS FIELD_PREP_CONST(PEF2256_SIC1_RBS_MASK, 0x2)
> +#define PEF2256_SIC1_RBS_BYPASS FIELD_PREP_CONST(PEF2256_SIC1_RBS_MASK, 0x3)
> +#define PEF2256_SIC1_XBS_MASK GENMASK(1, 0)
> +#define PEF2256_SIC1_XBS_BYPASS FIELD_PREP_CONST(PEF2256_SIC1_XBS_MASK, 0x0)
> +#define PEF2256_SIC1_XBS_1FRAME FIELD_PREP_CONST(PEF2256_SIC1_XBS_MASK, 0x1)
> +#define PEF2256_SIC1_XBS_2FRAMES FIELD_PREP_CONST(PEF2256_SIC1_XBS_MASK, 0x2)
> +#define PEF2256_SIC1_XBS_96BITS FIELD_PREP_CONST(PEF2256_SIC1_XBS_MASK, 0x3)
> +
> +/* System Interface Control 2 */
> +#define PEF2256_SIC2 0x3F
> +#define PEF2256_SIC2_SICS_MASK GENMASK(3, 1)
> +#define PEF2256_SIC2_SICS(_v) FIELD_PREP(PEF2256_SIC2_SICS_MASK, _v)
> +
> +/* System Interface Control 3 */
> +#define PEF2256_SIC3 0x40
> +#define PEF2256_SIC3_RTRI BIT(5)
> +#define PEF2256_SIC3_RESX BIT(3)
> +#define PEF2256_SIC3_RESR BIT(2)
> +
> +/* Clock Mode Register 1 */
> +#define PEF2256_CMR1 0x44
> +#define PEF2256_CMR1_RS_MASK GENMASK(5, 4)
> +#define PEF2256_CMR1_RS_DPLL FIELD_PREP_CONST(PEF2256_CMR1_RS_MASK, 0x0)
> +#define PEF2256_CMR1_RS_DPLL_LOS_HIGH FIELD_PREP_CONST(PEF2256_CMR1_RS_MASK, 0x1)
> +#define PEF2256_CMR1_RS_DCOR_2048 FIELD_PREP_CONST(PEF2256_CMR1_RS_MASK, 0x2)
> +#define PEF2256_CMR1_RS_DCOR_8192 FIELD_PREP_CONST(PEF2256_CMR1_RS_MASK, 0x3)
> +#define PEF2256_CMR1_DCS BIT(3)
> +
> +/* Clock Mode Register 2 */
> +#define PEF2256_CMR2 0x45
> +#define PEF2256_CMR2_DCOXC BIT(5)
> +
> +/* Global Configuration Register */
> +#define PEF2256_GCR 0x46
> +#define PEF2256_GCR_SCI BIT(6)
> +#define PEF2256_GCR_ECMC BIT(4)
> +
> +/* Port Configuration 5 */
> +#define PEF2256_PC5 0x84
> +#define PEF2256_PC5_CRP BIT(0)
> +
> +/* Global Port Configuration 1 */
> +#define PEF2256_GPC1 0x85
> +#define PEF2256_GPC1_CSFP_MASK GENMASK(7, 5)
> +#define PEF2256_GPC1_CSFP_SEC_IN_HIGH FIELD_PREP_CONST(PEF2256_GPC1_CSFP_MASK, 0x0)
> +#define PEF2256_GPC1_CSFP_SEC_OUT_HIGH FIELD_PREP_CONST(PEF2256_GPC1_CSFP_MASK, 0x1)
> +#define PEF2256_GPC1_CSFP_FSC_OUT_HIGH FIELD_PREP_CONST(PEF2256_GPC1_CSFP_MASK, 0x2)
> +#define PEF2256_GPC1_CSFP_FSC_OUT_LOW FIELD_PREP_CONST(PEF2256_GPC1_CSFP_MASK, 0x3)
> +
> +/* Port Configuration 6 */
> +#define PEF2256_PC6 0x86
> +
> +/* Global Counter Mode n=1..8 */
> +#define PEF2256_GCM(_n) (0x92 + (_n) - 1)
> +#define PEF2256_GCM1 0x92
> +#define PEF2256_GCM2 0x93
> +#define PEF2256_GCM3 0x94
> +#define PEF2256_GCM4 0x95
> +#define PEF2256_GCM5 0x96
> +#define PEF2256_GCM6 0x97
> +#define PEF2256_GCM7 0x98
> +#define PEF2256_GCM8 0x99
> +
> +/* Version Status Register */
> +#define PEF2256_VSTR 0x4A
> +#define PEF2256_VSTR_VERSION_12 0x00
> +#define PEF2256_VSTR_VERSION_21 0x10
> +#define PEF2256_VSTR_VERSION_2x 0x05
> +
> +/* Framer Receive Status 0 */
> +#define PEF2256_FRS0 0x4C
> +#define PEF2256_FRS0_LOS BIT(7)
> +#define PEF2256_FRS0_AIS BIT(6)
> +
> +/* Interrupt Status Register 0..5 */
> +#define PEF2256_ISR(_n) (0x68 + (_n))
> +#define PEF2256_ISR0 0x68
> +#define PEF2256_ISR1 0x69
> +#define PEF2256_ISR2 0x6A
> +#define PEF2256_ISR3 0x6B
> +#define PEF2256_ISR4 0x6C
> +#define PEF2256_ISR5 0x6D
> +
> +/* Global Interrupt Status */
> +#define PEF2256_GIS 0x6E
> +#define PEF2256_GIS_ISR(_n) BIT(_n)
> +
> +/* Wafer Identification Register */
> +#define PEF2256_WID 0xEC
> +#define PEF2256_12_WID_MASK GENMASK(1, 0)
> +#define PEF2256_12_WID_VERSION_12 FIELD_PREP_CONST(PEF2256_12_WID_MASK, 0x3)
> +#define PEF2256_2X_WID_MASK GENMASK(7, 6)
> +#define PEF2256_2X_WID_VERSION_21 FIELD_PREP_CONST(PEF2256_2X_WID_MASK, 0x0)
> +#define PEF2256_2X_WID_VERSION_22 FIELD_PREP_CONST(PEF2256_2X_WID_MASK, 0x1)
> +
> +/* IMR2/ISR2 Interrupts common bits */
> +#define PEF2256_INT2_AIS BIT(3)
> +#define PEF2256_INT2_LOS BIT(2)
> +
> +#endif /* __PEF2256_REGS_H__ */
> diff --git a/drivers/net/wan/framer/pef2256/pef2256.c b/drivers/net/wan/framer/pef2256/pef2256.c
> new file mode 100644
> index 000000000000..1eb5bc404278
> --- /dev/null
> +++ b/drivers/net/wan/framer/pef2256/pef2256.c
> @@ -0,0 +1,880 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PEF2256 also known as FALC56 driver
> + *
> + * Copyright 2023 CS GROUP France
> + *
> + * Author: Herve Codina <herve.codina@xxxxxxxxxxx>
> + */
> +
> +#include <linux/framer/pef2256.h>
> +#include <linux/clk.h>
> +#include <linux/framer/framer-provider.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/notifier.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include "pef2256-regs.h"
> +
> +enum pef2256_frame_type {
> + PEF2256_FRAME_E1_DOUBLEFRAME,
> + PEF2256_FRAME_E1_CRC4_MULTIFRAME,
> + PEF2256_FRAME_E1_AUTO_MULTIFRAME,
> + PEF2256_FRAME_T1J1_4FRAME,
> + PEF2256_FRAME_T1J1_12FRAME,
> + PEF2256_FRAME_T1J1_24FRAME,
> + PEF2256_FRAME_T1J1_72FRAME,
> +};
> +
> +struct pef2256 {
> + struct device *dev;
> + struct regmap *regmap;
> + enum pef2256_version version;
> + struct clk *mclk;
> + struct clk *sclkr;
> + struct clk *sclkx;
> + struct gpio_desc *reset_gpio;
> + unsigned long sysclk_rate;
> + u32 data_rate;
> + bool is_tx_falling_edge;
> + bool is_subordinate;
> + enum pef2256_frame_type frame_type;
> + u8 channel_phase;
> + atomic_t carrier;
> + struct framer *framer;
> +};
> +
> +static inline u8 pef2256_read8(struct pef2256 *pef2256, int offset)
> +{
> + int val;
> +
> + regmap_read(pef2256->regmap, offset, &val);
> + return val;
> +}
> +
> +static inline void pef2256_write8(struct pef2256 *pef2256, int offset, u8 val)
> +{
> + regmap_write(pef2256->regmap, offset, val);
> +}
> +
> +static inline void pef2256_clrbits8(struct pef2256 *pef2256, int offset, u8 clr)
> +{
> + regmap_clear_bits(pef2256->regmap, offset, clr);
> +}
> +
> +static inline void pef2256_setbits8(struct pef2256 *pef2256, int offset, u8 set)
> +{
> + regmap_set_bits(pef2256->regmap, offset, set);
> +}
> +
> +static inline void pef2256_clrsetbits8(struct pef2256 *pef2256, int offset, u8 clr, u8 set)
> +{
> + regmap_update_bits(pef2256->regmap, offset, clr | set, set);
> +}
> +
> +enum pef2256_version pef2256_get_version(struct pef2256 *pef2256)
> +{
> + enum pef2256_version version = PEF2256_VERSION_UNKNOWN;
> + u8 vstr, wid;
> +
> + vstr = pef2256_read8(pef2256, PEF2256_VSTR);
> + wid = pef2256_read8(pef2256, PEF2256_WID);
> +
> + switch (vstr) {
> + case PEF2256_VSTR_VERSION_12:
> + if ((wid & PEF2256_12_WID_MASK) == PEF2256_12_WID_VERSION_12)
> + version = PEF2256_VERSION_1_2;
> + break;
> + case PEF2256_VSTR_VERSION_2x:
> + switch (wid & PEF2256_2X_WID_MASK) {
> + case PEF2256_2X_WID_VERSION_21:
> + version = PEF2256_VERSION_2_1;
> + break;
> + case PEF2256_2X_WID_VERSION_22:
> + version = PEF2256_VERSION_2_2;
> + break;
> + }
> + break;
> + case PEF2256_VSTR_VERSION_21:
> + version = PEF2256_VERSION_2_1;
> + break;
> + }
> +
> + if (version == PEF2256_VERSION_UNKNOWN)
> + dev_err(pef2256->dev, "Unknown version (0x%02x, 0x%02x)\n", vstr, wid);
> +
> + return version;
> +}
> +EXPORT_SYMBOL_GPL(pef2256_get_version);
> +
> +enum pef2256_gcm_config_item {
> + PEF2256_GCM_CONFIG_1544000 = 0,
> + PEF2256_GCM_CONFIG_2048000,
> + PEF2256_GCM_CONFIG_8192000,
> + PEF2256_GCM_CONFIG_10000000,
> + PEF2256_GCM_CONFIG_12352000,
> + PEF2256_GCM_CONFIG_16384000,
> +};
> +
> +struct pef2256_gcm_config {
> + u8 gcm_12[6];
> + u8 gcm_2x[8];
> +};
> +
> +static const struct pef2256_gcm_config pef2256_gcm_configs[] = {
> + [PEF2256_GCM_CONFIG_1544000] = {
> + .gcm_12 = {0xF0, 0x51, 0x00, 0x80, 0x00, 0x15},
> + .gcm_2x = {0x00, 0x15, 0x00, 0x08, 0x00, 0x3F, 0x9C, 0xDF},
> + },
> + [PEF2256_GCM_CONFIG_2048000] = {
> + .gcm_12 = {0x00, 0x58, 0xD2, 0xC2, 0x00, 0x10},
> + .gcm_2x = {0x00, 0x18, 0xFB, 0x0B, 0x00, 0x2F, 0xDB, 0xDF},
> + },
> + [PEF2256_GCM_CONFIG_8192000] = {
> + .gcm_12 = {0x00, 0x58, 0xD2, 0xC2, 0x03, 0x10},
> + .gcm_2x = {0x00, 0x18, 0xFB, 0x0B, 0x00, 0x0B, 0xDB, 0xDF},
> + },
> + [PEF2256_GCM_CONFIG_10000000] = {
> + .gcm_12 = {0x90, 0x51, 0x81, 0x8F, 0x04, 0x10},
> + .gcm_2x = {0x40, 0x1B, 0x3D, 0x0A, 0x00, 0x07, 0xC9, 0xDC},
> + },
> + [PEF2256_GCM_CONFIG_12352000] = {
> + .gcm_12 = {0xF0, 0x51, 0x00, 0x80, 0x07, 0x15},
> + .gcm_2x = {0x00, 0x19, 0x00, 0x08, 0x01, 0x0A, 0x98, 0xDA},
> + },
> + [PEF2256_GCM_CONFIG_16384000] = {
> + .gcm_12 = {0x00, 0x58, 0xD2, 0xC2, 0x07, 0x10},
> + .gcm_2x = {0x00, 0x18, 0xFB, 0x0B, 0x01, 0x0B, 0xDB, 0xDF},
> + },
> +};
> +
> +static int pef2256_setup_gcm(struct pef2256 *pef2256)
> +{
> + enum pef2256_gcm_config_item item;
> + unsigned long mclk_rate;
> + const u8 *gcm;
> + int i, count;
> +
> + mclk_rate = clk_get_rate(pef2256->mclk);
> + switch (mclk_rate) {
> + case 1544000:
> + item = PEF2256_GCM_CONFIG_1544000;
> + break;
> + case 2048000:
> + item = PEF2256_GCM_CONFIG_2048000;
> + break;
> + case 8192000:
> + item = PEF2256_GCM_CONFIG_8192000;
> + break;
> + case 10000000:
> + item = PEF2256_GCM_CONFIG_10000000;
> + break;
> + case 12352000:
> + item = PEF2256_GCM_CONFIG_12352000;
> + break;
> + case 16384000:
> + item = PEF2256_GCM_CONFIG_16384000;
> + break;
> + default:
> + dev_err(pef2256->dev, "Unsupported v2.x MCLK rate %lu\n", mclk_rate);
> + return -EINVAL;
> + }
> +
> + BUILD_BUG_ON(item >= ARRAY_SIZE(pef2256_gcm_configs));
> +
> + if (pef2256->version == PEF2256_VERSION_1_2) {
> + gcm = pef2256_gcm_configs[item].gcm_12;
> + count = ARRAY_SIZE(pef2256_gcm_configs[item].gcm_12);
> + } else {
> + gcm = pef2256_gcm_configs[item].gcm_2x;
> + count = ARRAY_SIZE(pef2256_gcm_configs[item].gcm_2x);
> + }
> +
> + for (i = 0; i < count; i++)
> + pef2256_write8(pef2256, PEF2256_GCM(i + 1), *(gcm + i));
> +
> + return 0;
> +}
> +
> +static int pef2256_setup_e1_line(struct pef2256 *pef2256)
> +{
> + u8 fmr1, fmr2;
> +
> + /* RCLK output : DPLL clock, DCO-X enabled, DCO-X internal ref clock */
> + pef2256_write8(pef2256, PEF2256_CMR1, 0x00);
> +
> + /* SCLKR selected, SCLKX selected,
> + * receive synchro pulse sourced by SYPR,
> + * transmit synchro pulse sourced by SYPX,
> + * DCO-X center frequency enabled
> + */
> + pef2256_write8(pef2256, PEF2256_CMR2, PEF2256_CMR2_DCOXC);
> +
> + if (pef2256->is_subordinate) {
> + /* select RCLK source = 2M, disable switching from RCLK to SYNC */
> + pef2256_clrsetbits8(pef2256, PEF2256_CMR1, PEF2256_CMR1_RS_MASK,
> + PEF2256_CMR1_RS_DCOR_2048 | PEF2256_CMR1_DCS);
> + }
> +
> + /* slave mode, local loop off, mode short-haul
> + * In v2.x, bit3 is a forced 1 bit in the datasheet -> Need to be set.
> + */
> + if (pef2256->version == PEF2256_VERSION_1_2)
> + pef2256_write8(pef2256, PEF2256_LIM0, 0x00);
> + else
> + pef2256_write8(pef2256, PEF2256_LIM0, PEF2256_2X_LIM0_BIT3);
> +
> + /* "master" mode */
> + if (!pef2256->is_subordinate)
> + pef2256_setbits8(pef2256, PEF2256_LIM0, PEF2256_LIM0_MAS);
> +
> + /* analog interface selected, remote loop off */
> + pef2256_write8(pef2256, PEF2256_LIM1, 0x00);
> +
> + /* receive input threshold = 0,21V */
> + if (pef2256->version == PEF2256_VERSION_1_2)
> + pef2256_clrsetbits8(pef2256, PEF2256_LIM1, PEF2256_12_LIM1_RIL_MASK,
> + PEF2256_12_LIM1_RIL_210);
> + else
> + pef2256_clrsetbits8(pef2256, PEF2256_LIM1, PEF2256_2X_LIM1_RIL_MASK,
> + PEF2256_2X_LIM1_RIL_210);
> +
> + /* transmit pulse mask, default value from datasheet
> + * transmit line in normal operation
> + */
> + if (pef2256->version == PEF2256_VERSION_1_2)
> + pef2256_write8(pef2256, PEF2256_XPM0, 0x7B);
> + else
> + pef2256_write8(pef2256, PEF2256_XPM0, 0x9C);
> + pef2256_write8(pef2256, PEF2256_XPM1, 0x03);
> + pef2256_write8(pef2256, PEF2256_XPM2, 0x00);
> +
> + /* HDB3 coding, no alarm simulation */
> + pef2256_write8(pef2256, PEF2256_FMR0, PEF2256_FMR0_XC_HDB3 | PEF2256_FMR0_RC_HDB3);
> +
> + /* E1, frame format, 2 Mbit/s system data rate, no AIS
> + * transmission to remote end or system interface, payload loop
> + * off, transmit remote alarm on
> + */
> + fmr1 = 0x00;
> + fmr2 = PEF2256_FMR2_AXRA;
> + switch (pef2256->frame_type) {
> + case PEF2256_FRAME_E1_DOUBLEFRAME:
> + fmr2 |= PEF2256_FMR2_RFS_DOUBLEFRAME;
> + break;
> + case PEF2256_FRAME_E1_CRC4_MULTIFRAME:
> + fmr1 |= PEF2256_FMR1_XFS;
> + fmr2 |= PEF2256_FMR2_RFS_CRC4_MULTIFRAME;
> + break;
> + case PEF2256_FRAME_E1_AUTO_MULTIFRAME:
> + fmr1 |= PEF2256_FMR1_XFS;
> + fmr2 |= PEF2256_FMR2_RFS_AUTO_MULTIFRAME;
> + break;
> + default:
> + dev_err(pef2256->dev, "Unsupported frame type %d\n", pef2256->frame_type);
> + return -EINVAL;
> + }
> + pef2256_clrsetbits8(pef2256, PEF2256_FMR1, PEF2256_FMR1_XFS, fmr1);
> + pef2256_write8(pef2256, PEF2256_FMR2, fmr2);
> +
> + if (!pef2256->is_subordinate) {
> + /* SEC input, active high */
> + pef2256_write8(pef2256, PEF2256_GPC1, PEF2256_GPC1_CSFP_SEC_IN_HIGH);
> + } else {
> + /* FSC output, active high */
> + pef2256_write8(pef2256, PEF2256_GPC1, PEF2256_GPC1_CSFP_FSC_OUT_HIGH);
> + }
> +
> + /* SCLKR, SCLKX, RCLK configured to inputs,
> + * XFMS active low, CLK1 and CLK2 pin configuration
> + */
> + pef2256_write8(pef2256, PEF2256_PC5, 0x00);
> + pef2256_write8(pef2256, PEF2256_PC6, 0x00);
> +
> + /* port RCLK is output */
> + pef2256_setbits8(pef2256, PEF2256_PC5, PEF2256_PC5_CRP);
> +
> + return 0;
> +}
> +
> +static void pef2256_setup_e1_los(struct pef2256 *pef2256)
> +{
> + /* detection of LOS alarm = 176 pulses (ie (10 + 1) * 16) */
> + pef2256_write8(pef2256, PEF2256_PCD, 10);
> + /* recovery of LOS alarm = 22 pulses (ie 21 + 1) */
> + pef2256_write8(pef2256, PEF2256_PCR, 21);
> + /* E1 default for the receive slicer threshold */
> + pef2256_write8(pef2256, PEF2256_LIM2, PEF2256_LIM2_SLT_THR50);
> + if (pef2256->is_subordinate) {
> + /* Loop-timed */
> + pef2256_setbits8(pef2256, PEF2256_LIM2, PEF2256_LIM2_ELT);
> + }
> +}
> +
> +static int pef2256_setup_e1_system(struct pef2256 *pef2256)
> +{
> + u8 sic1, fmr1;
> +
> + /* 2.048 MHz system clocking rate, receive buffer 2 frames, transmit
> + * buffer bypass, data sampled and transmitted on the falling edge of
> + * SCLKR/X, automatic freeze signaling, data is active in the first
> + * channel phase
> + */
> + pef2256_write8(pef2256, PEF2256_SIC1, 0x00);
> + pef2256_write8(pef2256, PEF2256_SIC2, 0x00);
> + pef2256_write8(pef2256, PEF2256_SIC3, 0x00);
> +
> + if (pef2256->is_subordinate) {
> + /* transmit buffer size = 2 frames, transparent mode */
> + pef2256_clrsetbits8(pef2256, PEF2256_SIC1, PEF2256_SIC1_XBS_MASK,
> + PEF2256_SIC1_XBS_2FRAMES);
> + }
> +
> + if (pef2256->version != PEF2256_VERSION_1_2) {
> + /* during inactive channel phase switch RDO/RSIG into tri-state */
> + pef2256_setbits8(pef2256, PEF2256_SIC3, PEF2256_SIC3_RTRI);
> + }
> +
> + if (pef2256->is_tx_falling_edge) {
> + /* falling edge sync pulse transmit, rising edge sync pulse receive */
> + pef2256_clrsetbits8(pef2256, PEF2256_SIC3, PEF2256_SIC3_RESX, PEF2256_SIC3_RESR);
> + } else {
> + /* rising edge sync pulse transmit, falling edge sync pulse receive */
> + pef2256_clrsetbits8(pef2256, PEF2256_SIC3, PEF2256_SIC3_RESR, PEF2256_SIC3_RESX);
> + }
> +
> + /* transmit offset counter (XCO10..0) = 4 */
> + pef2256_write8(pef2256, PEF2256_XC0, 0);
> + pef2256_write8(pef2256, PEF2256_XC1, 4);
> + /* receive offset counter (RCO10..0) = 4 */
> + pef2256_write8(pef2256, PEF2256_RC0, 0);
> + pef2256_write8(pef2256, PEF2256_RC1, 4);
> +
> + /* system clock rate */
> + switch (pef2256->sysclk_rate) {
> + case 2048000:
> + sic1 = PEF2256_SIC1_SSC_2048;
> + break;
> + case 4096000:
> + sic1 = PEF2256_SIC1_SSC_4096;
> + break;
> + case 8192000:
> + sic1 = PEF2256_SIC1_SSC_8192;
> + break;
> + case 16384000:
> + sic1 = PEF2256_SIC1_SSC_16384;
> + break;
> + default:
> + dev_err(pef2256->dev, "Unsupported sysclk rate %lu\n", pef2256->sysclk_rate);
> + return -EINVAL;
> + }
> + pef2256_clrsetbits8(pef2256, PEF2256_SIC1, PEF2256_SIC1_SSC_MASK, sic1);
> +
> + /* data clock rate */
> + switch (pef2256->data_rate) {
> + case 2048000:
> + fmr1 = PEF2256_FMR1_SSD_2048;
> + sic1 = PEF2256_SIC1_SSD_2048;
> + break;
> + case 4096000:
> + fmr1 = PEF2256_FMR1_SSD_4096;
> + sic1 = PEF2256_SIC1_SSD_4096;
> + break;
> + case 8192000:
> + fmr1 = PEF2256_FMR1_SSD_8192;
> + sic1 = PEF2256_SIC1_SSD_8192;
> + break;
> + case 16384000:
> + fmr1 = PEF2256_FMR1_SSD_16384;
> + sic1 = PEF2256_SIC1_SSD_16384;
> + break;
> + default:
> + dev_err(pef2256->dev, "Unsupported data rate %u\n", pef2256->data_rate);
> + return -EINVAL;
> + }
> + pef2256_clrsetbits8(pef2256, PEF2256_FMR1, PEF2256_FMR1_SSD_MASK, fmr1);
> + pef2256_clrsetbits8(pef2256, PEF2256_SIC1, PEF2256_SIC1_SSD_MASK, sic1);
> +
> + /* channel phase */
> + pef2256_clrsetbits8(pef2256, PEF2256_SIC2, PEF2256_SIC2_SICS_MASK,
> + PEF2256_SIC2_SICS(pef2256->channel_phase));
> +
> + return 0;
> +}
> +
> +static void pef2256_setup_e1_signaling(struct pef2256 *pef2256)
> +{
> + /* All bits of the transmitted service word are cleared */
> + pef2256_write8(pef2256, PEF2256_XSW, PEF2256_XSW_XY(0x1F));
> +
> + /* CAS disabled and clear spare bit values */
> + pef2256_write8(pef2256, PEF2256_XSP, 0x00);
> +
> + if (pef2256->is_subordinate) {
> + /* transparent mode */
> + pef2256_setbits8(pef2256, PEF2256_XSW, PEF2256_XSW_XTM);
> + }
> +
> + /* Si-Bit, Spare bit For International, FAS word */
> + pef2256_setbits8(pef2256, PEF2256_XSW, PEF2256_XSW_XSIS);
> + pef2256_setbits8(pef2256, PEF2256_XSP, PEF2256_XSP_XSIF);
> +
> + /* no transparent mode active */
> + pef2256_write8(pef2256, PEF2256_TSWM, 0x00);
> +}
> +
> +static void pef2256_setup_e1_errors(struct pef2256 *pef2256)
> +{
> + /* error counter latched every 1s */
> + pef2256_setbits8(pef2256, PEF2256_FMR1, PEF2256_FMR1_ECM);
> +
> + /* error counter mode COFA */
> + pef2256_setbits8(pef2256, PEF2256_GCR, PEF2256_GCR_ECMC);
> +
> + /* errors in service words have no influence */
> + pef2256_setbits8(pef2256, PEF2256_RC0, PEF2256_RC0_SWD);
> +
> + /* 4 consecutive incorrect FAS causes loss of sync */
> + pef2256_setbits8(pef2256, PEF2256_RC0, PEF2256_RC0_ASY4);
> +}
> +
> +static int pef2256_setup_e1(struct pef2256 *pef2256)
> +{
> + int ret;
> +
> + /* Setup, Master clocking mode (GCM8..1) */
> + ret = pef2256_setup_gcm(pef2256);
> + if (ret)
> + return ret;
> +
> + /* Select E1 mode */
> + pef2256_write8(pef2256, PEF2256_FMR1, 0x00);
> +
> + /* internal second timer, power on */
> + pef2256_write8(pef2256, PEF2256_GCR, 0x00);
> +
> + /* Setup line interface */
> + ret = pef2256_setup_e1_line(pef2256);
> + if (ret)
> + return ret;
> +
> + /* Setup Loss-of-signal detection and recovery */
> + pef2256_setup_e1_los(pef2256);
> +
> + /* Setup system interface */
> + ret = pef2256_setup_e1_system(pef2256);
> + if (ret)
> + return ret;
> +
> + /* Setup signaling */
> + pef2256_setup_e1_signaling(pef2256);
> +
> + /* Setup errors counters and condition */
> + pef2256_setup_e1_errors(pef2256);
> +
> + /* status changed interrupt at both up and down */
> + pef2256_setbits8(pef2256, PEF2256_GCR, PEF2256_GCR_SCI);
> +
> + /* Clear any ISR2 pending interrupts and unmask needed interrupts */
> + pef2256_read8(pef2256, PEF2256_ISR2);
> + pef2256_clrbits8(pef2256, PEF2256_IMR2, PEF2256_INT2_LOS | PEF2256_INT2_AIS);
> +
> + /* reset lines */
> + pef2256_write8(pef2256, PEF2256_CMDR, PEF2256_CMDR_RRES | PEF2256_CMDR_XRES);
> + return 0;
> +}
> +
> +static void pef2256_isr_default_handler(struct pef2256 *pef2256, u8 nbr, u8 isr)
> +{
> + dev_warn(pef2256->dev, "ISR%u: 0x%02x not handled\n", nbr, isr);
> +}
> +
> +static bool pef2256_is_carrier_on(struct pef2256 *pef2256)
> +{
> + u8 frs0;
> +
> + frs0 = pef2256_read8(pef2256, PEF2256_FRS0);
> + return !(frs0 & (PEF2256_FRS0_LOS | PEF2256_FRS0_AIS));
> +}
> +
> +static void pef2256_isr2_handler(struct pef2256 *pef2256, u8 nbr, u8 isr)
> +{
> + bool carrier;
> +
> + if (isr & (PEF2256_INT2_LOS | PEF2256_INT2_AIS)) {
> + carrier = pef2256_is_carrier_on(pef2256);
> + if (atomic_xchg(&pef2256->carrier, carrier) != carrier)
> + framer_notify_status_change(pef2256->framer);
> + }
> +}
> +
> +static irqreturn_t pef2256_irq_handler(int irq, void *priv)
> +{
> + static void (*pef2256_isr_handler[])(struct pef2256 *, u8, u8) = {
> + [0] = pef2256_isr_default_handler,
> + [1] = pef2256_isr_default_handler,
> + [2] = pef2256_isr2_handler,
> + [3] = pef2256_isr_default_handler,
> + [4] = pef2256_isr_default_handler,
> + [5] = pef2256_isr_default_handler
> + };
> + struct pef2256 *pef2256 = (struct pef2256 *)priv;
> + u8 gis;
> + u8 isr;
> + u8 n;
> +
> + gis = pef2256_read8(pef2256, PEF2256_GIS);
> +
> + for (n = 0; n < ARRAY_SIZE(pef2256_isr_handler); n++) {
> + if (gis & PEF2256_GIS_ISR(n)) {
> + isr = pef2256_read8(pef2256, PEF2256_ISR(n));
> + pef2256_isr_handler[n](pef2256, n, isr);
> + }
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int pef2256_check_rates(struct pef2256 *pef2256, unsigned long sysclk_rate,
> + unsigned long data_rate)
> +{
> + unsigned long rate;
> +
> + switch (sysclk_rate) {
> + case 2048000:
> + case 4096000:
> + case 8192000:
> + case 16384000:
> + break;
> + default:
> + dev_err(pef2256->dev, "Unsupported system clock rate %lu\n", sysclk_rate);
> + return -EINVAL;
> + }
> +
> + for (rate = data_rate; rate <= data_rate * 4; rate *= 2) {
> + if (rate == sysclk_rate)
> + return 0;
> + }
> + dev_err(pef2256->dev, "Unsupported data rate %lu with system clock rate %lu\n",
> + data_rate, sysclk_rate);
> + return -EINVAL;
> +}
> +
> +static int pef2556_of_parse(struct pef2256 *pef2256, struct device_node *np)
> +{
> + int ret;
> +
> + pef2256->data_rate = 2048000;
> + ret = of_property_read_u32(np, "lantiq,data-rate-bps", &pef2256->data_rate);
> + if (ret && ret != -EINVAL) {
> + dev_err(pef2256->dev, "%pOF: failed to read lantiq,data-rate-bps\n", np);
> + return ret;
> + }
> +
> + ret = pef2256_check_rates(pef2256, pef2256->sysclk_rate, pef2256->data_rate);
> + if (ret)
> + return ret;
> +
> + pef2256->is_tx_falling_edge = of_property_read_bool(np, "lantiq,clock-falling-edge");
> +
> + pef2256->channel_phase = 0;
> + ret = of_property_read_u8(np, "lantiq,channel-phase", &pef2256->channel_phase);
> + if (ret && ret != -EINVAL) {
> + dev_err(pef2256->dev, "%pOF: failed to read lantiq,channel-phase\n",
> + np);
> + return ret;
> + }
> + if (pef2256->channel_phase >= pef2256->sysclk_rate / pef2256->data_rate) {
> + dev_err(pef2256->dev, "%pOF: Invalid lantiq,channel-phase %u\n",
> + np, pef2256->channel_phase);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static const struct regmap_config pef2256_regmap_config = {
> + .reg_bits = 32,
> + .val_bits = 8,
> + .max_register = 0xff,
> +};
> +
> +static const struct mfd_cell pef2256_devs[] = {
> + { .name = "lantiq-pef2256-pinctrl", },
> +};
> +
> +static int pef2256_add_audio_devices(struct pef2256 *pef2256)
> +{
> + const char *compatible = "lantiq,pef2256-codec";
> + struct mfd_cell *audio_devs;
> + struct device_node *np;
> + unsigned int count = 0;
> + unsigned int i;
> + int ret;
> +
> + for_each_available_child_of_node(pef2256->dev->of_node, np) {
> + if (of_device_is_compatible(np, compatible))
> + count++;
> + }
> +
> + if (!count)
> + return 0;
> +
> + audio_devs = kcalloc(count, sizeof(*audio_devs), GFP_KERNEL);
> + if (!audio_devs)
> + return -ENOMEM;
> +
> + for (i = 0; i < count; i++) {
> + (audio_devs + i)->name = "framer-codec";
> + (audio_devs + i)->of_compatible = compatible;
> + (audio_devs + i)->id = i;
> + }
> +
> + ret = mfd_add_devices(pef2256->dev, 0, audio_devs, count, NULL, 0, NULL);
> + kfree(audio_devs);
> + return ret;
> +}
> +
> +static int pef2256_framer_get_status(struct framer *framer, struct framer_status *status)
> +{
> + struct pef2256 *pef2256 = framer_get_drvdata(framer);
> +
> + status->link_is_on = !!atomic_read(&pef2256->carrier);
> + return 0;
> +}
> +
> +static int pef2256_framer_set_config(struct framer *framer, const struct framer_config *config)
> +{
> + struct pef2256 *pef2256 = framer_get_drvdata(framer);
> +
> + if (config->iface != FRAMER_IFACE_E1) {
> + dev_err(pef2256->dev, "Only E1 line is currently supported\n");
> + return -EOPNOTSUPP;
> + }
> +
> + switch (config->clock_type) {
> + case FRAMER_CLOCK_EXT:
> + pef2256->is_subordinate = true;
> + break;
> + case FRAMER_CLOCK_INT:
> + pef2256->is_subordinate = false;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + /* Apply the new settings */
> + return pef2256_setup_e1(pef2256);
> +}
> +
> +static int pef2256_framer_get_config(struct framer *framer, struct framer_config *config)
> +{
> + struct pef2256 *pef2256 = framer_get_drvdata(framer);
> +
> + config->iface = FRAMER_IFACE_E1;
> + config->clock_type = pef2256->is_subordinate ? FRAMER_CLOCK_EXT : FRAMER_CLOCK_INT;
> + config->line_clock_rate = 2048000;
> + return 0;
> +}
> +
> +static const struct framer_ops pef2256_framer_ops = {
> + .owner = THIS_MODULE,
> + .get_status = pef2256_framer_get_status,
> + .get_config = pef2256_framer_get_config,
> + .set_config = pef2256_framer_set_config,
> +};
> +
> +static int pef2256_probe(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + unsigned long sclkr_rate, sclkx_rate;
> + struct framer_provider *framer_provider;
> + struct pef2256 *pef2256;
> + const char *version_txt;
> + void __iomem *iomem;
> + int ret;
> + int irq;
> +
> + pef2256 = devm_kzalloc(&pdev->dev, sizeof(*pef2256), GFP_KERNEL);
> + if (!pef2256)
> + return -ENOMEM;
> +
> + pef2256->dev = &pdev->dev;
> + atomic_set(&pef2256->carrier, 0);
> +
> + pef2256->is_subordinate = true;
> + pef2256->frame_type = PEF2256_FRAME_E1_DOUBLEFRAME;
> +
> + iomem = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(iomem))
> + return PTR_ERR(iomem);
> +
> + pef2256->regmap = devm_regmap_init_mmio(&pdev->dev, iomem,
> + &pef2256_regmap_config);
> + if (IS_ERR(pef2256->regmap)) {
> + dev_err(&pdev->dev, "Failed to initialise Regmap (%ld)\n",
> + PTR_ERR(pef2256->regmap));
> + return PTR_ERR(pef2256->regmap);
> + }
> +
> + pef2256->mclk = devm_clk_get_enabled(&pdev->dev, "mclk");
> + if (IS_ERR(pef2256->mclk))
> + return PTR_ERR(pef2256->mclk);
> +
> + pef2256->sclkr = devm_clk_get_enabled(&pdev->dev, "sclkr");
> + if (IS_ERR(pef2256->sclkr))
> + return PTR_ERR(pef2256->sclkr);
> +
> + pef2256->sclkx = devm_clk_get_enabled(&pdev->dev, "sclkx");
> + if (IS_ERR(pef2256->sclkx))
> + return PTR_ERR(pef2256->sclkx);
> +
> + /* Both SCLKR (receive) and SCLKX (transmit) must have the same rate,
> + * stored as sysclk_rate.
> + * The exact value will be checked at pef2256_check_rates()
> + */
> + sclkr_rate = clk_get_rate(pef2256->sclkr);
> + sclkx_rate = clk_get_rate(pef2256->sclkx);
> + if (sclkr_rate != sclkx_rate) {
> + dev_err(pef2256->dev, "clk rate mismatch. sclkr %lu Hz, sclkx %lu Hz\n",
> + sclkr_rate, sclkx_rate);
> + return -EINVAL;
> + }
> + pef2256->sysclk_rate = sclkr_rate;
> +
> + /* Reset the component. The MCLK clock must be active during reset */
> + pef2256->reset_gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(pef2256->reset_gpio))
> + return PTR_ERR(pef2256->reset_gpio);
> + if (pef2256->reset_gpio) {
> + gpiod_set_value_cansleep(pef2256->reset_gpio, 1);
> + usleep_range(10, 20);
> + gpiod_set_value_cansleep(pef2256->reset_gpio, 0);
> + usleep_range(10, 20);
> + }
> +
> + pef2256->version = pef2256_get_version(pef2256);
> + switch (pef2256->version) {
> + case PEF2256_VERSION_1_2:
> + version_txt = "1.2";
> + break;
> + case PEF2256_VERSION_2_1:
> + version_txt = "2.1";
> + break;
> + case PEF2256_VERSION_2_2:
> + version_txt = "2.2";
> + break;
> + default:
> + return -ENODEV;
> + }
> + dev_info(pef2256->dev, "Version %s detected\n", version_txt);
> +
> + ret = pef2556_of_parse(pef2256, np);
> + if (ret)
> + return ret;
> +
> + /* Create the framer. It can be used on interrupts */
> + pef2256->framer = devm_framer_create(pef2256->dev, NULL, &pef2256_framer_ops);
> + if (IS_ERR(pef2256->framer))
> + return PTR_ERR(pef2256->framer);
> +
> + framer_set_drvdata(pef2256->framer, pef2256);
> +
> + /* Disable interrupts */
> + pef2256_write8(pef2256, PEF2256_IMR0, 0xff);
> + pef2256_write8(pef2256, PEF2256_IMR1, 0xff);
> + pef2256_write8(pef2256, PEF2256_IMR2, 0xff);
> + pef2256_write8(pef2256, PEF2256_IMR3, 0xff);
> + pef2256_write8(pef2256, PEF2256_IMR4, 0xff);
> + pef2256_write8(pef2256, PEF2256_IMR5, 0xff);
> +
> + /* Clear any pending interrupts */
> + pef2256_read8(pef2256, PEF2256_ISR0);
> + pef2256_read8(pef2256, PEF2256_ISR1);
> + pef2256_read8(pef2256, PEF2256_ISR2);
> + pef2256_read8(pef2256, PEF2256_ISR3);
> + pef2256_read8(pef2256, PEF2256_ISR4);
> + pef2256_read8(pef2256, PEF2256_ISR5);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> + ret = devm_request_irq(pef2256->dev, irq, pef2256_irq_handler, 0, "pef2256", pef2256);
> + if (ret < 0)
> + return ret;
> +
> + platform_set_drvdata(pdev, pef2256);
> +
> + ret = mfd_add_devices(pef2256->dev, 0, pef2256_devs,
> + ARRAY_SIZE(pef2256_devs), NULL, 0, NULL);
> + if (ret) {
> + dev_err(pef2256->dev, "add devices failed (%d)\n", ret);
> + return ret;
> + }
> +
> + ret = pef2256_setup_e1(pef2256);
> + if (ret)
> + return ret;
> +
> + framer_provider = devm_framer_provider_of_register(pef2256->dev,
> + framer_provider_simple_of_xlate);
> + if (IS_ERR(framer_provider))
> + return PTR_ERR(framer_provider);
> +
> + /* Add audio devices */
> + ret = pef2256_add_audio_devices(pef2256);
> + if (ret < 0) {
> + dev_err(pef2256->dev, "add audio devices failed (%d)\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int pef2256_remove(struct platform_device *pdev)
> +{
> + struct pef2256 *pef2256 = platform_get_drvdata(pdev);
> +
> + /* Disable interrupts */
> + pef2256_write8(pef2256, PEF2256_IMR0, 0xff);
> + pef2256_write8(pef2256, PEF2256_IMR1, 0xff);
> + pef2256_write8(pef2256, PEF2256_IMR2, 0xff);
> + pef2256_write8(pef2256, PEF2256_IMR3, 0xff);
> + pef2256_write8(pef2256, PEF2256_IMR4, 0xff);
> + pef2256_write8(pef2256, PEF2256_IMR5, 0xff);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id pef2256_id_table[] = {
> + { .compatible = "lantiq,pef2256" },
> + {} /* sentinel */
> +};
> +MODULE_DEVICE_TABLE(of, pef2256_id_table);
> +
> +static struct platform_driver pef2256_driver = {
> + .driver = {
> + .name = "lantiq-pef2256",
> + .of_match_table = pef2256_id_table,
> + },
> + .probe = pef2256_probe,
> + .remove = pef2256_remove,
> +};
> +module_platform_driver(pef2256_driver);
> +
> +struct regmap *pef2256_get_regmap(struct pef2256 *pef2256)
> +{
> + return pef2256->regmap;
> +}
> +EXPORT_SYMBOL_GPL(pef2256_get_regmap);
> +
> +MODULE_AUTHOR("Herve Codina <herve.codina@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("PEF2256 driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/framer/pef2256.h b/include/linux/framer/pef2256.h
> new file mode 100644
> index 000000000000..71d80af58c40
> --- /dev/null
> +++ b/include/linux/framer/pef2256.h
> @@ -0,0 +1,31 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * PEF2256 consumer API
> + *
> + * Copyright 2023 CS GROUP France
> + *
> + * Author: Herve Codina <herve.codina@xxxxxxxxxxx>
> + */
> +#ifndef __PEF2256_H__
> +#define __PEF2256_H__
> +
> +#include <linux/types.h>
> +
> +struct pef2256;
> +struct regmap;
> +
> +/* Retrieve the PEF2256 regmap */
> +struct regmap *pef2256_get_regmap(struct pef2256 *pef2256);
> +
> +/* PEF2256 hardware versions */
> +enum pef2256_version {
> + PEF2256_VERSION_UNKNOWN,
> + PEF2256_VERSION_1_2,
> + PEF2256_VERSION_2_1,
> + PEF2256_VERSION_2_2,
> +};
> +
> +/* Get the PEF2256 hardware version */
> +enum pef2256_version pef2256_get_version(struct pef2256 *pef2256);
> +
> +#endif /* __PEF2256_H__ */

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