* [PATCH 2/7] drivers: misc: Add support for the Lantiq PEF2256 framer
2023-03-15 13:42 [PATCH 0/7] Add the Lantiq PEF2256 audio support Herve Codina
2023-03-15 13:42 ` [PATCH 1/7] dt-bindings: misc: Add the Lantiq PEF2466 E1/T1/J1 framer Herve Codina
@ 2023-03-15 13:42 ` Herve Codina
2023-03-15 13:42 ` [PATCH 3/7] Documentation: sysfs: Document the Lantiq PEF2256 sysfs entry Herve Codina
` (4 subsequent siblings)
6 siblings, 0 replies; 10+ messages in thread
From: Herve Codina @ 2023-03-15 13:42 UTC (permalink / raw)
To: Herve Codina, Rob Herring, Krzysztof Kozlowski, Liam Girdwood,
Mark Brown, Derek Kiernan, Dragan Cvetic, Arnd Bergmann,
Greg Kroah-Hartman, Jaroslav Kysela, Takashi Iwai
Cc: linux-kernel, devicetree, alsa-devel, Christophe Leroy,
Thomas Petazzoni
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@bootlin.com>
---
drivers/misc/Kconfig | 16 +
drivers/misc/Makefile | 1 +
drivers/misc/pef2256.c | 1441 +++++++++++++++++++++++++++++++++++++++
include/linux/pef2256.h | 36 +
4 files changed, 1494 insertions(+)
create mode 100644 drivers/misc/pef2256.c
create mode 100644 include/linux/pef2256.h
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 433aa4197785..b64f9435a51b 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -376,6 +376,22 @@ config HMC6352
This driver provides support for the Honeywell HMC6352 compass,
providing configuration and heading data via sysfs.
+config PEF2256
+ tristate "Lantiq PEF2256 (FALC56) framer"
+ select PINCTRL
+ select PINMUX
+ select GENERIC_PINCONF
+ help
+ This option enables support for the Lantiq PEF2256 framer, also known
+ as FALC56. This framer and its line interface component is designed
+ to fulfill all required interfacing between analog E1/T1/J1 lines and
+ the digital PCM system highway.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called pef2256.
+
config DS1682
tristate "Dallas DS1682 Total Elapsed Time Recorder with Alarm"
depends on I2C
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 56de43943cd5..a26f044ab9dd 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o
obj-$(CONFIG_DS1682) += ds1682.o
obj-$(CONFIG_C2PORT) += c2port/
obj-$(CONFIG_HMC6352) += hmc6352.o
+obj-$(CONFIG_PEF2256) += pef2256.o
obj-y += eeprom/
obj-y += cb710/
obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o
diff --git a/drivers/misc/pef2256.c b/drivers/misc/pef2256.c
new file mode 100644
index 000000000000..859b944aba8c
--- /dev/null
+++ b/drivers/misc/pef2256.c
@@ -0,0 +1,1441 @@
+// 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/pef2256.h>
+#include <linux/clk.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define PEF2256_CMDR 0x02 /* Command Register */
+#define PEF2256_CMDR_RRES BIT(6)
+#define PEF2256_CMDR_XRES BIT(4)
+#define PEF2256_CMDR_SRES BIT(0)
+#define PEF2256_IMR0 0x14 /* Interrupt Mask Register 0 */
+#define PEF2256_IMR1 0x15 /* Interrupt Mask Register 1 */
+#define PEF2256_IMR2 0x16 /* Interrupt Mask Register 2 */
+#define PEF2256_IMR3 0x17 /* Interrupt Mask Register 3 */
+#define PEF2256_IMR4 0x18 /* Interrupt Mask Register 4 */
+#define PEF2256_IMR5 0x19 /* Interrupt Mask Register 5 */
+#define PEF2256_FMR0 0x1C /* Framer Mode Register 0 */
+#define PEF2256_FMR0_XC_MASK (0x3 << 6)
+#define PEF2256_FMR0_XC_NRZ (0x0 << 6)
+#define PEF2256_FMR0_XC_CMI (0x1 << 6)
+#define PEF2256_FMR0_XC_AMI (0x2 << 6)
+#define PEF2256_FMR0_XC_HDB3 (0x3 << 6)
+#define PEF2256_FMR0_RC_MASK (0x3 << 4)
+#define PEF2256_FMR0_RC_NRZ (0x0 << 4)
+#define PEF2256_FMR0_RC_CMI (0x1 << 4)
+#define PEF2256_FMR0_RC_AMI (0x2 << 4)
+#define PEF2256_FMR0_RC_HDB3 (0x3 << 4)
+#define PEF2256_FMR1 0x1D /* Framer Mode Register 1 */
+#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 BIT(1)
+#define PEF2256_FMR1_SSD_2048 0
+#define PEF2256_FMR1_SSD_4096 BIT(1)
+#define PEF2256_FMR1_SSD_8192 0
+#define PEF2256_FMR1_SSD_16384 BIT(1)
+#define PEF2256_FMR2 0x1E /* Framer Mode Register 2 */
+#define PEF2256_FMR2_RFS_MASK (0x3 << 6)
+#define PEF2256_FMR2_RFS_DOUBLEFRAME (0x0 << 6)
+#define PEF2256_FMR2_RFS_CRC4_MULTIFRAME (0x2 << 6)
+#define PEF2256_FMR2_RFS_AUTO_MULTIFRAME (0x3 << 6)
+#define PEF2256_FMR2_AXRA BIT(1)
+#define PEF2256_LOOP 0x1F /* Channel Loop-Back */
+#define PEF2256_XSW 0x20 /* Transmit Service Word */
+#define PEF2256_XSW_XSIS BIT(7)
+#define PEF2256_XSW_XTM BIT(6)
+#define PEF2256_XSW_XY_MASK (0x1f << 0)
+#define PEF2256_XSW_XY(_v) ((_v) & 0x1f)
+#define PEF2256_XSP 0x21 /* Transmit Spare Bits */
+#define PEF2256_XSP_XSIF BIT(2)
+#define PEF2256_XC0 0x22 /* Transmit Control 0 */
+#define PEF2256_XC1 0x23 /* Transmit Control 1 */
+#define PEF2256_RC0 0x24 /* Receive Control 0 */
+#define PEF2256_RC0_SWD BIT(7)
+#define PEF2256_RC0_ASY4 BIT(6)
+#define PEF2256_RC1 0x25 /* Receive Control 1 */
+#define PEF2256_XPM0 0x26 /* Transmit Pulse Mask 0 */
+#define PEF2256_XPM1 0x27 /* Transmit Pulse Mask 1 */
+#define PEF2256_XPM2 0x28 /* Transmit Pulse Mask 2 */
+#define PEF2256_XPM2_XLT BIT(6)
+#define PEF2256_TSWM 0x29 /* Transparent Service Word Mask */
+#define PEF2256_LIM0 0x36 /* Line Interface Mode 0 */
+#define PEF2256_2X_LIM0_BIT3 BIT(3) /* v2.x, described as a forced '1' bit */
+#define PEF2256_LIM0_MAS BIT(0)
+#define PEF2256_LIM1 0x37 /* Line Interface Mode 1 */
+#define PEF2256_12_LIM1_RIL_MASK (0x7 << 4)
+#define PEF2256_12_LIM1_RIL_910 (0x0 << 4)
+#define PEF2256_12_LIM1_RIL_740 (0x1 << 4)
+#define PEF2256_12_LIM1_RIL_590 (0x2 << 4)
+#define PEF2256_12_LIM1_RIL_420 (0x3 << 4)
+#define PEF2256_12_LIM1_RIL_320 (0x4 << 4)
+#define PEF2256_12_LIM1_RIL_210 (0x5 << 4)
+#define PEF2256_12_LIM1_RIL_160 (0x6 << 4)
+#define PEF2256_12_LIM1_RIL_100 (0x7 << 4)
+#define PEF2256_2X_LIM1_RIL_MASK (0x7 << 4)
+#define PEF2256_2X_LIM1_RIL_2250 (0x0 << 4)
+#define PEF2256_2X_LIM1_RIL_1100 (0x1 << 4)
+#define PEF2256_2X_LIM1_RIL_600 (0x2 << 4)
+#define PEF2256_2X_LIM1_RIL_350 (0x3 << 4)
+#define PEF2256_2X_LIM1_RIL_210 (0x4 << 4)
+#define PEF2256_2X_LIM1_RIL_140 (0x5 << 4)
+#define PEF2256_2X_LIM1_RIL_100 (0x6 << 4)
+#define PEF2256_2X_LIM1_RIL_50 (0x7 << 4)
+#define PEF2256_PCD 0x38 /* Pulse Count Detection */
+#define PEF2256_PCR 0x39 /* Pulse Count Recovery */
+#define PEF2256_LIM2 0x3A /* Line Interface Mode 2 */
+#define PEF2256_LIM2_SLT_MASK (0x3 << 4)
+#define PEF2256_LIM2_SLT_THR55 (0x0 << 4)
+#define PEF2256_LIM2_SLT_THR67 (0x1 << 4)
+#define PEF2256_LIM2_SLT_THR50 (0x2 << 4)
+#define PEF2256_LIM2_SLT_THR45 (0x3 << 4)
+#define PEF2256_LIM2_ELT BIT(2)
+#define PEF2256_SIC1 0x3E /* System Interface Control 1 */
+#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 BIT(6)
+#define PEF2256_SIC1_SSD_2048 0
+#define PEF2256_SIC1_SSD_4096 0
+#define PEF2256_SIC1_SSD_8192 BIT(6)
+#define PEF2256_SIC1_SSD_16384 BIT(6)
+#define PEF2256_SIC1_RBS_MASK (0x3 << 4)
+#define PEF2256_SIC1_RBS_2FRAMES (0x0 << 4)
+#define PEF2256_SIC1_RBS_1FRAME (0x1 << 4)
+#define PEF2256_SIC1_RBS_96BITS (0x2 << 4)
+#define PEF2256_SIC1_RBS_BYPASS (0x3 << 4)
+#define PEF2256_SIC1_XBS_MASK (0x3 << 0)
+#define PEF2256_SIC1_XBS_BYPASS (0x0 << 0)
+#define PEF2256_SIC1_XBS_1FRAME (0x1 << 0)
+#define PEF2256_SIC1_XBS_2FRAMES (0x2 << 0)
+#define PEF2256_SIC1_XBS_96BITS (0x3 << 0)
+#define PEF2256_SIC2 0x3F /* System Interface Control 2 */
+#define PEF2256_SIC2_SICS_MASK (0x7 << 1)
+#define PEF2256_SIC2_SICS(_v) ((_v) << 1)
+#define PEF2256_SIC3 0x40 /* System Interface Control 3 */
+#define PEF2256_SIC3_RTRI BIT(5)
+#define PEF2256_SIC3_RESX BIT(3)
+#define PEF2256_SIC3_RESR BIT(2)
+#define PEF2256_CMR1 0x44 /* Clock Mode Register 1 */
+#define PEF2256_CMR1_RS_MASK (0x3 << 4)
+#define PEF2256_CMR1_RS_DPLL (0x0 << 4)
+#define PEF2256_CMR1_RS_DPLL_LOS_HIGH (0x1 << 4)
+#define PEF2256_CMR1_RS_DCOR_2048 (0x2 << 4)
+#define PEF2256_CMR1_RS_DCOR_8192 (0x3 << 4)
+#define PEF2256_CMR1_DCS BIT(3)
+#define PEF2256_CMR2 0x45 /* Clock Mode Register 2 */
+#define PEF2256_CMR2_DCOXC BIT(5)
+#define PEF2256_GCR 0x46 /* Global Configuration Register */
+#define PEF2256_GCR_SCI BIT(6)
+#define PEF2256_GCR_ECMC BIT(4)
+#define PEF2256_PC1 0x80 /* Port Configuration 1 */
+#define PEF2256_PC2 0x81 /* Port Configuration 2 */
+#define PEF2256_PC3 0x82 /* Port Configuration 3 */
+#define PEF2256_PC4 0x83 /* Port Configuration 4 */
+#define PEF2256_12_PC_RPC_MASK (0x7 << 4)
+#define PEF2256_12_PC_RPC_SYPR (0x0 << 4)
+#define PEF2256_12_PC_RPC_RFM (0x1 << 4)
+#define PEF2256_12_PC_RPC_RFMB (0x2 << 4)
+#define PEF2256_12_PC_RPC_RSIGM (0x3 << 4)
+#define PEF2256_12_PC_RPC_RSIG (0x4 << 4)
+#define PEF2256_12_PC_RPC_DLR (0x5 << 4)
+#define PEF2256_12_PC_RPC_FREEZE (0x6 << 4)
+#define PEF2256_12_PC_RPC_RFSP (0x7 << 4)
+#define PEF2256_12_PC_XPC_MASK (0xf << 0)
+#define PEF2256_12_PC_XPC_SYPX (0x0 << 0)
+#define PEF2256_12_PC_XPC_XFMS (0x1 << 0)
+#define PEF2256_12_PC_XPC_XSIG (0x2 << 0)
+#define PEF2256_12_PC_XPC_TCLK (0x3 << 0)
+#define PEF2256_12_PC_XPC_XMFB (0x4 << 0)
+#define PEF2256_12_PC_XPC_XSIGM (0x5 << 0)
+#define PEF2256_12_PC_XPC_DLX (0x6 << 0)
+#define PEF2256_12_PC_XPC_XCLK (0x7 << 0)
+#define PEF2256_12_PC_XPC_XLT (0x8 << 0)
+#define PEF2256_2X_PC_RPC_MASK (0xf << 4)
+#define PEF2256_2X_PC_RPC_SYPR (0x0 << 4)
+#define PEF2256_2X_PC_RPC_RFM (0x1 << 4)
+#define PEF2256_2X_PC_RPC_RFMB (0x2 << 4)
+#define PEF2256_2X_PC_RPC_RSIGM (0x3 << 4)
+#define PEF2256_2X_PC_RPC_RSIG (0x4 << 4)
+#define PEF2256_2X_PC_RPC_DLR (0x5 << 4)
+#define PEF2256_2X_PC_RPC_FREEZE (0x6 << 4)
+#define PEF2256_2X_PC_RPC_RFSP (0x7 << 4)
+#define PEF2256_2X_PC_RPC_GPI (0x9 << 4)
+#define PEF2256_2X_PC_RPC_GPOH (0xa << 4)
+#define PEF2256_2X_PC_RPC_GPOL (0xb << 4)
+#define PEF2256_2X_PC_RPC_LOS (0xc << 4)
+#define PEF2256_2X_PC_XPC_MASK (0xf << 0)
+#define PEF2256_2X_PC_XPC_SYPX (0x0 << 0)
+#define PEF2256_2X_PC_XPC_XFMS (0x1 << 0)
+#define PEF2256_2X_PC_XPC_XSIG (0x2 << 0)
+#define PEF2256_2X_PC_XPC_TCLK (0x3 << 0)
+#define PEF2256_2X_PC_XPC_XMFB (0x4 << 0)
+#define PEF2256_2X_PC_XPC_XSIGM (0x5 << 0)
+#define PEF2256_2X_PC_XPC_DLX (0x6 << 0)
+#define PEF2256_2X_PC_XPC_XCLK (0x7 << 0)
+#define PEF2256_2X_PC_XPC_XLT (0x8 << 0)
+#define PEF2256_2X_PC_XPC_GPI (0x9 << 0)
+#define PEF2256_2X_PC_XPC_GPOH (0xa << 0)
+#define PEF2256_2X_PC_XPC_GPOL (0xb << 0)
+#define PEF2256_PC5 0x84 /* Port Configuration 5 */
+#define PEF2256_PC5_CRP BIT(0)
+#define PEF2256_GPC1 0x85 /* Global Port Configuration 1 */
+#define PEF2256_GPC1_CSFP_MASK (0x3 << 5)
+#define PEF2256_GPC1_CSFP_SEC_IN_HIGH (0x0 << 5)
+#define PEF2256_GPC1_CSFP_SEC_OUT_HIGH (0x1 << 5)
+#define PEF2256_GPC1_CSFP_FSC_OUT_HIGH (0x2 << 5)
+#define PEF2256_GPC1_CSFP_FSC_OUT_LOW (0x3 << 5)
+#define PEF2256_PC6 0x86 /* Port Configuration 6 */
+#define PEF2256_GCM(_n) (0x92 + _n - 1) /* Global Counter Mode n=1..8 */
+#define PEF2256_GCM1 0x92 /* Global Counter Mode 1 */
+#define PEF2256_GCM2 0x93 /* Global Counter Mode 2 */
+#define PEF2256_GCM3 0x94 /* Global Counter Mode 3 */
+#define PEF2256_GCM4 0x95 /* Global Counter Mode 4 */
+#define PEF2256_GCM5 0x96 /* Global Counter Mode 5 */
+#define PEF2256_GCM6 0x97 /* Global Counter Mode 6 */
+#define PEF2256_GCM7 0x98 /* Global Counter Mode 7 */
+#define PEF2256_GCM8 0x99 /* Global Counter Mode 8 */
+
+#define PEF2256_VSTR 0x4A /* Version Status Register */
+#define PEF2256_VSTR_VERSION_12 0x00
+#define PEF2256_VSTR_VERSION_21 0x10
+#define PEF2256_VSTR_VERSION_2x 0x05
+#define PEF2256_FRS0 0x4C /* Framer Receive Status 0 */
+#define PEF2256_FRS0_LOS BIT(7)
+#define PEF2256_FRS0_AIS BIT(6)
+#define PEF2256_ISR(_n) (0x68 + n) /* Interrupt Status Register (n=0..5) */
+#define PEF2256_ISR0 0x68 /* Interrupt Status Register 0 */
+#define PEF2256_ISR1 0x69 /* Interrupt Status Register 1 */
+#define PEF2256_ISR2 0x6A /* Interrupt Status Register 2 */
+#define PEF2256_ISR3 0x6B /* Interrupt Status Register 3 */
+#define PEF2256_ISR4 0x6C /* Interrupt Status Register 4 */
+#define PEF2256_ISR5 0x6D /* Interrupt Status Register 5 */
+#define PEF2256_GIS 0x6E /* Global Interrupt Status */
+#define PEF2256_GIS_ISR(_n) (1<<(n))
+#define PEF2256_WID 0xEC /* Wafer Identification Register */
+#define PEF2256_12_WID_MASK 0x03
+#define PEF2256_12_WID_VERSION_12 0x03
+#define PEF2256_2X_WID_MASK 0xc0
+#define PEF2256_2X_WID_VERSION_21 0x00
+#define PEF2256_2X_WID_VERSION_22 0x40
+
+/* IMR2/ISR2 Interrupts */
+#define PEF2256_INT2_AIS BIT(3)
+#define PEF2256_INT2_LOS BIT(2)
+
+enum pef2256_version {
+ PEF2256_VERSION_UNKNOWN,
+ PEF2256_VERSION_1_2,
+ PEF2256_VERSION_2_1,
+ PEF2256_VERSION_2_2,
+};
+
+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_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 {
+ struct device *dev;
+ void *__iomem regs;
+ enum pef2256_version version;
+ spinlock_t lock;
+ struct clk *mclk;
+ struct gpio_desc *reset_gpio;
+ struct {
+ struct pinctrl_desc pctrl_desc;
+ const struct pef2256_function_desc *functions;
+ unsigned int nfunctions;
+ } pinctrl;
+ bool is_e1;
+ u32 sysclk_rate;
+ u32 data_rate;
+ bool is_tx_falling_edge;
+ bool is_subordinate;
+ enum pef2256_frame_type frame_type;
+ u8 channel_phase;
+ bool is_carrier_on;
+ struct atomic_notifier_head event_notifier_list;
+};
+
+static inline u8 pef2256_read8(struct pef2256 *pef2256, int offset)
+{
+ return ioread8(pef2256->regs + offset);
+}
+
+static inline void pef2256_write8(struct pef2256 *pef2256, int offset, u8 val)
+{
+ iowrite8(val, pef2256->regs + offset);
+}
+
+static inline void pef2256_clrbits8(struct pef2256 *pef2256, int offset, u8 clr)
+{
+ u8 v;
+
+ v = pef2256_read8(pef2256, offset);
+ v &= ~clr;
+ pef2256_write8(pef2256, offset, v);
+}
+
+static inline void pef2256_setbits8(struct pef2256 *pef2256, int offset, u8 set)
+{
+ u8 v;
+
+ v = pef2256_read8(pef2256, offset);
+ v |= set;
+ pef2256_write8(pef2256, offset, v);
+}
+
+
+static inline void pef2256_clrsetbits8(struct pef2256 *pef2256, int offset, u8 clr, u8 set)
+{
+ u8 v;
+
+ v = pef2256_read8(pef2256, offset);
+ v &= ~clr;
+ v |= set;
+ pef2256_write8(pef2256, offset, v);
+}
+
+static enum pef2256_version pef2256_get_version(struct pef2256 *pef2256)
+{
+ enum pef2256_version version;
+ const char *version_txt;
+ 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_txt = "1.2";
+ version = PEF2256_VERSION_1_2;
+ goto end;
+ }
+ break;
+ case PEF2256_VSTR_VERSION_2x:
+ switch (wid & PEF2256_2X_WID_MASK) {
+ case PEF2256_2X_WID_VERSION_21:
+ version_txt = "2.1 (2.x)";
+ version = PEF2256_VERSION_2_1;
+ goto end;
+ case PEF2256_2X_WID_VERSION_22:
+ version_txt = "2.2 (2.x)";
+ version = PEF2256_VERSION_2_2;
+ goto end;
+ default:
+ break;
+ }
+ break;
+ case PEF2256_VSTR_VERSION_21:
+ version_txt = "2.1";
+ version = PEF2256_VERSION_2_1;
+ goto end;
+ default:
+ break;
+ }
+
+ dev_err(pef2256->dev, "Unknown version (0x%02x, 0x%02x)\n", vstr, wid);
+ return PEF2256_VERSION_UNKNOWN;
+
+end:
+ dev_info(pef2256->dev, "Version %s detected\n", version_txt);
+ return version;
+}
+
+static int pef2256_12_setup_gcm(struct pef2256 *pef2256)
+{
+ static const u8 gcm_1544000[6] = {0xF0, 0x51, 0x00, 0x80, 0x00, 0x15};
+ static const u8 gcm_2048000[6] = {0x00, 0x58, 0xD2, 0xC2, 0x00, 0x10};
+ static const u8 gcm_8192000[6] = {0x00, 0x58, 0xD2, 0xC2, 0x03, 0x10};
+ static const u8 gcm_10000000[6] = {0x90, 0x51, 0x81, 0x8F, 0x04, 0x10};
+ static const u8 gcm_12352000[6] = {0xF0, 0x51, 0x00, 0x80, 0x07, 0x15};
+ static const u8 gcm_16384000[6] = {0x00, 0x58, 0xD2, 0xC2, 0x07, 0x10};
+ unsigned long mclk_rate;
+ const u8 *gcm;
+ int i;
+
+ mclk_rate = clk_get_rate(pef2256->mclk);
+ switch (mclk_rate) {
+ case 1544000:
+ gcm = gcm_1544000;
+ break;
+ case 2048000:
+ gcm = gcm_2048000;
+ break;
+ case 8192000:
+ gcm = gcm_8192000;
+ break;
+ case 10000000:
+ gcm = gcm_10000000;
+ break;
+ case 12352000:
+ gcm = gcm_12352000;
+ break;
+ case 16384000:
+ gcm = gcm_16384000;
+ break;
+ default:
+ dev_err(pef2256->dev, "Unsupported v1.2 MCLK rate %lu\n", mclk_rate);
+ return -EINVAL;
+ }
+ for (i = 0; i < 6; i++)
+ pef2256_write8(pef2256, PEF2256_GCM(i+1), gcm[i]);
+
+ return 0;
+}
+
+static int pef2256_2x_setup_gcm(struct pef2256 *pef2256)
+{
+ static const u8 gcm_1544000[8] = {0x00, 0x15, 0x00, 0x08, 0x00, 0x3F, 0x9C, 0xDF};
+ static const u8 gcm_2048000[8] = {0x00, 0x18, 0xFB, 0x0B, 0x00, 0x2F, 0xDB, 0xDF};
+ static const u8 gcm_8192000[8] = {0x00, 0x18, 0xFB, 0x0B, 0x00, 0x0B, 0xDB, 0xDF};
+ static const u8 gcm_10000000[8] = {0x40, 0x1B, 0x3D, 0x0A, 0x00, 0x07, 0xC9, 0xDC};
+ static const u8 gcm_12352000[8] = {0x00, 0x19, 0x00, 0x08, 0x01, 0x0A, 0x98, 0xDA};
+ static const u8 gcm_16384000[8] = {0x00, 0x18, 0xFB, 0x0B, 0x01, 0x0B, 0xDB, 0xDF};
+ unsigned long mclk_rate;
+ const u8 *gcm;
+ int i;
+
+ mclk_rate = clk_get_rate(pef2256->mclk);
+ switch (mclk_rate) {
+ case 1544000:
+ gcm = gcm_1544000;
+ break;
+ case 2048000:
+ gcm = gcm_2048000;
+ break;
+ case 8192000:
+ gcm = gcm_8192000;
+ break;
+ case 10000000:
+ gcm = gcm_10000000;
+ break;
+ case 12352000:
+ gcm = gcm_12352000;
+ break;
+ case 16384000:
+ gcm = gcm_16384000;
+ break;
+ default:
+ dev_err(pef2256->dev, "Unsupported v2.x MCLK rate %lu\n", mclk_rate);
+ return -EINVAL;
+ }
+ for (i = 0; i < 8; i++)
+ pef2256_write8(pef2256, PEF2256_GCM(i+1), gcm[i]);
+
+ return 0;
+}
+
+static int pef2256_setup_gcm(struct pef2256 *pef2256)
+{
+ return (pef2256->version == PEF2256_VERSION_1_2) ?
+ pef2256_12_setup_gcm(pef2256) : pef2256_2x_setup_gcm(pef2256);
+}
+
+static int pef2256_setup_e1(struct pef2256 *pef2256)
+{
+ u8 fmr1, fmr2, sic1;
+ int ret;
+
+ /* Basic setup, Master clocking mode (GCM8..1) */
+ ret = pef2256_setup_gcm(pef2256);
+ if (ret)
+ return ret;
+
+ /* 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
+ */
+ pef2256_write8(pef2256, PEF2256_CMR2, 0x00);
+
+ /* NRZ coding, no alarm simulation */
+ pef2256_write8(pef2256, PEF2256_FMR0, 0x00);
+
+ /*
+ * 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_write8(pef2256, PEF2256_FMR1, fmr1);
+ pef2256_write8(pef2256, PEF2256_FMR2, fmr2);
+
+ /* E1 default for the receive slicer threshold */
+ pef2256_write8(pef2256, PEF2256_LIM2, PEF2256_LIM2_SLT_THR50);
+ if (!pef2256->is_subordinate) {
+ /* SEC input, active high */
+ pef2256_write8(pef2256, PEF2256_GPC1, PEF2256_GPC1_CSFP_SEC_IN_HIGH);
+ } else {
+ /* Loop-timed */
+ pef2256_setbits8(pef2256, PEF2256_LIM2, PEF2256_LIM2_ELT);
+ /* FSC output, active high */
+ pef2256_write8(pef2256, PEF2256_GPC1, PEF2256_GPC1_CSFP_FSC_OUT_HIGH);
+ }
+
+ /* internal second timer, power on */
+ pef2256_write8(pef2256, PEF2256_GCR, 0x00);
+
+ /*
+ * 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);
+
+ /* analog interface selected, remote loop off */
+ pef2256_write8(pef2256, PEF2256_LIM1, 0x00);
+
+ /*
+ * 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);
+
+ /*
+ * 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);
+
+ /* channel loop-back and single frame mode are disabled */
+ pef2256_write8(pef2256, PEF2256_LOOP, 0x00);
+
+ /* 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);
+
+ /* no transparent mode active */
+ pef2256_write8(pef2256, PEF2256_TSWM, 0x00);
+
+ /*
+ * the transmit clock offset is cleared
+ * the transmit time slot offset is cleared
+ */
+ pef2256_write8(pef2256, PEF2256_XC0, 0x00);
+
+ /* Keep default value for the transmit offset */
+ pef2256_write8(pef2256, PEF2256_XC1, 0x9C);
+
+ /*
+ * transmit pulse mask, default value from datasheet
+ * transmitter in tristate mode
+ */
+ if (pef2256->version == PEF2256_VERSION_1_2) {
+ pef2256_write8(pef2256, PEF2256_XPM0, 0x7B);
+ pef2256_write8(pef2256, PEF2256_XPM1, 0x03);
+ pef2256_write8(pef2256, PEF2256_XPM2, PEF2256_XPM2_XLT | 0x00);
+ } else {
+ pef2256_write8(pef2256, PEF2256_XPM0, 0x9C);
+ pef2256_write8(pef2256, PEF2256_XPM1, 0x03);
+ pef2256_write8(pef2256, PEF2256_XPM2, PEF2256_XPM2_XLT | 0x00);
+ }
+
+ /* "master" mode */
+ if (!pef2256->is_subordinate)
+ pef2256_setbits8(pef2256, PEF2256_LIM0, PEF2256_LIM0_MAS);
+
+ /* transmit line in normal operation */
+ pef2256_clrbits8(pef2256, PEF2256_XPM2, PEF2256_XPM2_XLT);
+
+ if (pef2256->version == PEF2256_VERSION_1_2) {
+ /* receive input threshold = 0,21V */
+ pef2256_clrsetbits8(pef2256, PEF2256_LIM1, PEF2256_12_LIM1_RIL_MASK,
+ PEF2256_12_LIM1_RIL_210);
+ } else {
+ /* receive input threshold = 0,21V */
+ pef2256_clrsetbits8(pef2256, PEF2256_LIM1, PEF2256_2X_LIM1_RIL_MASK,
+ PEF2256_2X_LIM1_RIL_210);
+ }
+ /* transmit line coding = HDB3 */
+ pef2256_clrsetbits8(pef2256, PEF2256_FMR0, PEF2256_FMR0_XC_MASK,
+ PEF2256_FMR0_XC_HDB3);
+
+ /* receive line coding = HDB3 */
+ pef2256_clrsetbits8(pef2256, PEF2256_FMR0, PEF2256_FMR0_RC_MASK,
+ PEF2256_FMR0_RC_HDB3);
+
+ /* 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);
+
+ /* DCO-X center frequency enabled */
+ pef2256_setbits8(pef2256, PEF2256_CMR2, PEF2256_CMR2_DCOXC);
+
+ if (pef2256->is_subordinate) {
+ /* select RCLK source = 2M */
+ pef2256_clrsetbits8(pef2256, PEF2256_CMR1, PEF2256_CMR1_RS_MASK,
+ PEF2256_CMR1_RS_DCOR_2048);
+ /* disable switching from RCLK to SYNC */
+ pef2256_setbits8(pef2256, PEF2256_CMR1, PEF2256_CMR1_DCS);
+ }
+
+ 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) {
+ /* rising edge sync pulse transmit */
+ pef2256_clrsetbits8(pef2256, PEF2256_SIC3,
+ PEF2256_SIC3_RESR, PEF2256_SIC3_RESX);
+ } else {
+ /* rising edge sync pulse receive */
+ pef2256_clrsetbits8(pef2256, PEF2256_SIC3,
+ PEF2256_SIC3_RESX, PEF2256_SIC3_RESR);
+ }
+
+ /* 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 %u\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));
+
+ if (pef2256->is_subordinate) {
+ /* transmit buffer size = 2 frames */
+ pef2256_clrsetbits8(pef2256, PEF2256_SIC1, PEF2256_SIC1_XBS_MASK,
+ PEF2256_SIC1_XBS_2FRAMES);
+ /* transmit transparent mode */
+ pef2256_setbits8(pef2256, PEF2256_XSW, PEF2256_XSW_XTM);
+ }
+
+ /* 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);
+ /* Si-Bit, Spare bit For International, FAS word */
+ pef2256_setbits8(pef2256, PEF2256_XSW, PEF2256_XSW_XSIS);
+ pef2256_setbits8(pef2256, PEF2256_XSP, PEF2256_XSP_XSIF);
+
+ /* port RCLK is output */
+ pef2256_setbits8(pef2256, PEF2256_PC5, PEF2256_PC5_CRP);
+ /* 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 int pef2256_setup(struct pef2256 *pef2256)
+{
+ if (!pef2256->is_e1) {
+ dev_err(pef2256->dev, "Only E1 line is currently supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ return pef2256_setup_e1(pef2256);
+}
+
+
+
+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 is_changed = false;
+ unsigned long flags;
+ bool is_carrier_on;
+
+ if (isr & (PEF2256_INT2_LOS | PEF2256_INT2_AIS)) {
+
+ spin_lock_irqsave(&pef2256->lock, flags);
+ is_carrier_on = pef2256_is_carrier_on(pef2256);
+ if (is_carrier_on != pef2256->is_carrier_on) {
+ pef2256->is_carrier_on = is_carrier_on;
+ is_changed = true;
+ }
+ spin_unlock_irqrestore(&pef2256->lock, flags);
+
+ if (is_changed)
+ atomic_notifier_call_chain(&pef2256->event_notifier_list,
+ PEF2256_EVENT_CARRIER, NULL);
+ }
+}
+
+static irqreturn_t pef2256_irq_handler(int irq, void *priv)
+{
+ 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)
+{
+ const char *str;
+ int ret;
+
+ str = "e1";
+ ret = of_property_read_string(np, "lantiq,line-interface", &str);
+ if (ret && ret != -EINVAL) {
+ dev_err(pef2256->dev, "%pOF: failed to read lantiq,line-interface\n",
+ np);
+ return ret;
+ }
+ if (!strcmp(str, "e1")) {
+ pef2256->is_e1 = true;
+ } else if (!strcmp(str, "t1j1")) {
+ pef2256->is_e1 = false;
+ } else {
+ dev_err(pef2256->dev, "%pOF: Invalid lantiq,line-interface (%s)\n",
+ np, str);
+ return -EINVAL;
+ }
+ dev_dbg(pef2256->dev, "config: %s line\n", pef2256->is_e1 ? "E1" : "T1/J1");
+
+ pef2256->sysclk_rate = 2048000;
+ ret = of_property_read_u32(np, "lantiq,sysclk-rate-hz", &pef2256->sysclk_rate);
+ if (ret && ret != -EINVAL) {
+ dev_err(pef2256->dev, "%pOF: failed to read lantiq,sysclk-rate-hz\n", np);
+ return ret;
+ }
+ dev_dbg(pef2256->dev, "config: sysclk %u Hz\n", pef2256->sysclk_rate);
+
+ 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;
+ }
+ dev_dbg(pef2256->dev, "config: data rate %u bps\n", pef2256->data_rate);
+
+ 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");
+ dev_dbg(pef2256->dev, "config: tx on %s edge\n",
+ pef2256->is_tx_falling_edge ? "falling" : "rising");
+
+ pef2256->is_subordinate = of_property_read_bool(np, "lantiq,subordinate");
+ dev_dbg(pef2256->dev, "config: subordinate %s\n",
+ pef2256->is_subordinate ? "on" : "off");
+
+ str = pef2256->is_e1 ? "doubleframe" : "12frame";
+ ret = of_property_read_string(np, "lantiq,frame-format", &str);
+ if (ret && ret != -EINVAL) {
+ dev_err(pef2256->dev, "%pOF: failed to read lantiq,frame-format\n",
+ np);
+ return ret;
+ }
+ if (pef2256->is_e1) {
+ if (!strcmp(str, "doubleframe")) {
+ pef2256->frame_type = PEF2256_FRAME_E1_DOUBLEFRAME;
+ } else if (!strcmp(str, "crc4-multiframe")) {
+ pef2256->frame_type = PEF2256_FRAME_E1_CRC4_MULTIFRAME;
+ } else if (!strcmp(str, "auto-multiframe")) {
+ pef2256->frame_type = PEF2256_FRAME_E1_AUTO_MULTIFRAME;
+ } else {
+ dev_err(pef2256->dev, "%pOF: Invalid lantiq,frame-format (%s)\n",
+ np, str);
+ return -EINVAL;
+ }
+ } else {
+ if (!strcmp(str, "4frame")) {
+ pef2256->frame_type = PEF2256_FRAME_T1J1_4FRAME;
+ } else if (!strcmp(str, "12frame")) {
+ pef2256->frame_type = PEF2256_FRAME_T1J1_12FRAME;
+ } else if (!strcmp(str, "24frame")) {
+ pef2256->frame_type = PEF2256_FRAME_T1J1_24FRAME;
+ } else if (!strcmp(str, "72frame")) {
+ pef2256->frame_type = PEF2256_FRAME_T1J1_72FRAME;
+ } else {
+ dev_err(pef2256->dev, "%pOF: Invalid lantiq,frame-format (%s)\n",
+ np, str);
+ return -EINVAL;
+ }
+ }
+ dev_dbg(pef2256->dev, "config: frame type %d\n", pef2256->frame_type);
+
+ 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;
+ }
+ dev_dbg(pef2256->dev, "config: channel phase %u\n", pef2256->channel_phase);
+
+ return 0;
+}
+
+static int pef2256_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ struct pef2256 *pef2256 = pinctrl_dev_get_drvdata(pctldev);
+
+ /* We map 1 group <-> 1 pin */
+ return pef2256->pinctrl.pctrl_desc.npins;
+}
+
+static const char *pef2256_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ struct pef2256 *pef2256 = pinctrl_dev_get_drvdata(pctldev);
+
+ /* We map 1 group <-> 1 pin */
+ return pef2256->pinctrl.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 *pef2256 = pinctrl_dev_get_drvdata(pctldev);
+
+ /* We map 1 group <-> 1 pin */
+ *pins = &pef2256->pinctrl.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 *pef2256 = pinctrl_dev_get_drvdata(pctldev);
+
+ return pef2256->pinctrl.nfunctions;
+}
+
+static const char *pef2256_get_function_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ struct pef2256 *pef2256 = pinctrl_dev_get_drvdata(pctldev);
+
+ return pef2256->pinctrl.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 *pef2256 = pinctrl_dev_get_drvdata(pctldev);
+
+ *groups = pef2256->pinctrl.functions[selector].groups;
+ *num_groups = pef2256->pinctrl.functions[selector].ngroups;
+ return 0;
+}
+
+static int pef2256_set_mux(struct pinctrl_dev *pctldev, unsigned int func_selector,
+ unsigned int group_selector)
+{
+ struct pef2256 *pef2256 = pinctrl_dev_get_drvdata(pctldev);
+ const struct pef2256_pinreg_desc *pinreg_desc;
+ u8 func_val;
+
+ dev_dbg(pef2256->dev, "set %s to %s function\n",
+ pef2256->pinctrl.pctrl_desc.pins[group_selector].name,
+ pef2256->pinctrl.functions[func_selector].name);
+
+ /* We map 1 group <-> 1 pin */
+ pinreg_desc = pef2256->pinctrl.pctrl_desc.pins[group_selector].drv_data;
+ func_val = pef2256->pinctrl.functions[func_selector].func_val;
+
+ pef2256_clrsetbits8(pef2256, pinreg_desc->offset, pinreg_desc->mask,
+ func_val & pinreg_desc->mask);
+
+ return 0;
+}
+
+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 const 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 const 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 *pef2256)
+{
+ struct pinctrl_dev *pctrl;
+
+ pef2256->pinctrl.pctrl_desc.name = dev_name(pef2256->dev);
+ pef2256->pinctrl.pctrl_desc.owner = THIS_MODULE;
+ pef2256->pinctrl.pctrl_desc.pctlops = &pef2256_pctlops;
+ pef2256->pinctrl.pctrl_desc.pmxops = &pef2256_pmxops;
+ if (pef2256->version == PEF2256_VERSION_1_2) {
+ pef2256->pinctrl.pctrl_desc.pins = pef2256_v12_pins;
+ pef2256->pinctrl.pctrl_desc.npins = ARRAY_SIZE(pef2256_v12_pins);
+ pef2256->pinctrl.functions = pef2256_v12_functions;
+ pef2256->pinctrl.nfunctions = ARRAY_SIZE(pef2256_v12_functions);
+ } else {
+ pef2256->pinctrl.pctrl_desc.pins = pef2256_v2x_pins;
+ pef2256->pinctrl.pctrl_desc.npins = ARRAY_SIZE(pef2256_v2x_pins);
+ pef2256->pinctrl.functions = pef2256_v2x_functions;
+ pef2256->pinctrl.nfunctions = ARRAY_SIZE(pef2256_v2x_functions);
+ }
+
+
+ pctrl = devm_pinctrl_register(pef2256->dev, &pef2256->pinctrl.pctrl_desc, pef2256);
+ if (IS_ERR(pctrl)) {
+ dev_err(pef2256->dev, "pinctrl driver registration failed\n");
+ return PTR_ERR(pctrl);
+ }
+
+ return 0;
+}
+
+static void pef2256_reset_pinmux(struct pef2256 *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;
+
+ pef2256_write8(pef2256, PEF2256_PC1, val);
+ pef2256_write8(pef2256, PEF2256_PC2, val);
+ pef2256_write8(pef2256, PEF2256_PC3, val);
+ pef2256_write8(pef2256, PEF2256_PC4, val);
+}
+
+static ssize_t subordinate_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct pef2256 *pef2256 = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%d\n", pef2256->is_subordinate);
+}
+
+static ssize_t subordinate_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct pef2256 *pef2256 = dev_get_drvdata(dev);
+ int ret;
+
+ if (strtobool(buf, &pef2256->is_subordinate) < 0)
+ return -EINVAL;
+
+ ret = pef2256_setup(pef2256);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(subordinate);
+
+static const struct attribute_group pef2256_attribute_group = {
+ .attrs = (struct attribute *[]) {
+ &dev_attr_subordinate.attr,
+ NULL,
+ },
+};
+
+static int pef2256_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct pef2256 *pef2256;
+ int ret;
+ int irq;
+
+ pef2256 = devm_kzalloc(&pdev->dev, sizeof(*pef2256), GFP_KERNEL);
+ if (!pef2256)
+ return -ENOMEM;
+
+ pef2256->dev = &pdev->dev;
+ spin_lock_init(&pef2256->lock);
+ ATOMIC_INIT_NOTIFIER_HEAD(&pef2256->event_notifier_list);
+
+ pef2256->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(pef2256->regs))
+ return PTR_ERR(pef2256->regs);
+
+ pef2256->mclk = devm_clk_get_enabled(&pdev->dev, "mclk");
+ if (IS_ERR(pef2256->mclk))
+ return PTR_ERR(pef2256->mclk);
+ dev_dbg(pef2256->dev, "mclk %lu Hz\n", clk_get_rate(pef2256->mclk));
+
+ /* 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);
+ udelay(10);
+ gpiod_set_value_cansleep(pef2256->reset_gpio, 0);
+ udelay(10);
+ }
+
+ pef2256->version = pef2256_get_version(pef2256);
+ if (pef2256->version == PEF2256_VERSION_UNKNOWN)
+ return -ENODEV;
+
+ ret = pef2556_of_parse(pef2256, np);
+ if (ret)
+ return ret;
+
+ /* 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;
+
+ pef2256_reset_pinmux(pef2256);
+ ret = pef2256_register_pinctrl(pef2256);
+ if (ret)
+ return ret;
+
+ /*
+ * We are going to reset the E1 lines during setup() call and the ISR2
+ * interrupt used to detect the carrier state changed is masked.
+ * It is time to initialize our internal carrier state flag.
+ */
+ pef2256->is_carrier_on = false;
+
+ ret = pef2256_setup(pef2256);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, pef2256);
+
+ ret = sysfs_create_group(&pef2256->dev->kobj, &pef2256_attribute_group);
+ if (ret < 0) {
+ dev_err(pef2256->dev, "sysfs registration failed (%d)\n", ret);
+ platform_set_drvdata(pdev, NULL);
+ 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);
+
+ sysfs_remove_group(&pef2256->dev->kobj, &pef2256_attribute_group);
+
+ 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 = of_match_ptr(pef2256_id_table),
+ },
+ .probe = pef2256_probe,
+ .remove = pef2256_remove,
+};
+module_platform_driver(pef2256_driver);
+
+struct pef2256 *pef2256_get_byphandle(struct device_node *np, const char *phandle_name)
+{
+ struct device_node *pef2256_np;
+ struct platform_device *pdev;
+ struct pef2256 *pef2256;
+
+ pef2256_np = of_parse_phandle(np, phandle_name, 0);
+ if (!pef2256_np)
+ return ERR_PTR(-EINVAL);
+
+ if (!of_match_node(pef2256_driver.driver.of_match_table, pef2256_np)) {
+ of_node_put(pef2256_np);
+ return ERR_PTR(-EINVAL);
+ }
+
+ pdev = of_find_device_by_node(pef2256_np);
+ of_node_put(pef2256_np);
+ if (!pdev)
+ return ERR_PTR(-ENODEV);
+
+ pef2256 = platform_get_drvdata(pdev);
+ if (!pef2256) {
+ platform_device_put(pdev);
+ return ERR_PTR(-EPROBE_DEFER);
+ }
+
+ return pef2256;
+}
+EXPORT_SYMBOL(pef2256_get_byphandle);
+
+void pef2256_put(struct pef2256 *pef2256)
+{
+ put_device(pef2256->dev);
+}
+EXPORT_SYMBOL(pef2256_put);
+
+static void devm_pef2256_release(struct device *dev, void *res)
+{
+ struct pef2256 **pef2256 = res;
+
+ pef2256_put(*pef2256);
+}
+
+struct pef2256 *devm_pef2256_get_byphandle(struct device *dev, struct device_node *np,
+ const char *phandle_name)
+{
+ struct pef2256 *pef2256;
+ struct pef2256 **dr;
+
+ dr = devres_alloc(devm_pef2256_release, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return ERR_PTR(-ENOMEM);
+
+ pef2256 = pef2256_get_byphandle(np, phandle_name);
+ if (!IS_ERR(pef2256)) {
+ *dr = pef2256;
+ devres_add(dev, dr);
+ } else {
+ devres_free(dr);
+ }
+
+ return pef2256;
+}
+EXPORT_SYMBOL(devm_pef2256_get_byphandle);
+
+int pef2256_register_event_notifier(struct pef2256 *pef2256, struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&pef2256->event_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(pef2256_register_event_notifier);
+
+int pef2256_unregister_event_notifier(struct pef2256 *pef2256, struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&pef2256->event_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(pef2256_unregister_event_notifier);
+
+bool pef2256_get_carrier(struct pef2256 *pef2256)
+{
+ unsigned long flags;
+ bool is_carrier_on;
+
+ spin_lock_irqsave(&pef2256->lock, flags);
+ is_carrier_on = pef2256->is_carrier_on;
+ spin_unlock_irqrestore(&pef2256->lock, flags);
+
+ return is_carrier_on;
+}
+EXPORT_SYMBOL_GPL(pef2256_get_carrier);
+
+MODULE_AUTHOR("Herve Codina <herve.codina@bootlin.com>");
+MODULE_DESCRIPTION("PEF2256 driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/pef2256.h b/include/linux/pef2256.h
new file mode 100644
index 000000000000..6c8d173595b1
--- /dev/null
+++ b/include/linux/pef2256.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * PEF2256 management
+ *
+ * Copyright 2023 CS GROUP France
+ *
+ * Author: Herve Codina <herve.codina@bootlin.com>
+ */
+#ifndef __PEF2256_H__
+#define __PEF2256_H__
+
+#include <linux/types.h>
+
+struct pef2256;
+struct device_node;
+struct device;
+struct notifier_block;
+
+struct pef2256 *pef2256_get_byphandle(struct device_node *np, const char *phandle_name);
+void pef2256_put(struct pef2256 *pef2256);
+struct pef2256 *devm_pef2256_get_byphandle(struct device *dev, struct device_node *np,
+ const char *phandle_name);
+
+
+enum pef2256_event {
+ PEF2256_EVENT_CARRIER, /* Carrier state changed */
+};
+
+/* The nb.notifier_call function registered must not sleep */
+int pef2256_register_event_notifier(struct pef2256 *pef2256, struct notifier_block *nb);
+int pef2256_unregister_event_notifier(struct pef2256 *pef2256, struct notifier_block *nb);
+
+/* Retrieve carrier state. true: carrier on, false: carrier off */
+bool pef2256_get_carrier(struct pef2256 *pef2256);
+
+#endif /* __PEF2256_H__ */
--
2.39.2
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