Commit c37d4a00 authored by Zhao Qiang's avatar Zhao Qiang Committed by David S. Miller

Maxim/driver: Add driver for maxim ds26522

Signed-off-by: default avatarZhao Qiang <>
Signed-off-by: default avatarDavid S. Miller <>
parent 8a79813c
......@@ -291,6 +291,17 @@ config FSL_UCC_HDLC
To compile this driver as a module, choose M here: the
module will be called fsl_ucc_hdlc.
config SLIC_DS26522
tristate "Slic Maxim ds26522 card support"
depends on SPI
This module initializes and configures the slic maxim card
in T1 or E1 mode.
To compile this driver as a module, choose M here: the
module will be called slic_ds26522.
bool "Etinc PCISYNC features"
depends on DSCC4
......@@ -33,6 +33,7 @@ obj-$(CONFIG_PCI200SYN) += pci200syn.o
obj-$(CONFIG_PC300TOO) += pc300too.o
obj-$(CONFIG_IXP4XX_HSS) += ixp4xx_hss.o
obj-$(CONFIG_FSL_UCC_HDLC) += fsl_ucc_hdlc.o
obj-$(CONFIG_SLIC_DS26522) += slic_ds26522.o
clean-files :=
$(obj)/wanxl.o: $(obj)/
* drivers/net/wan/slic_ds26522.c
* Copyright (C) 2016 Freescale Semiconductor, Inc.
* Author:Zhao Qiang<>
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
#include <linux/bitrev.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/spi/spi.h>
#include <linux/wait.h>
#include <linux/param.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/io.h>
#include "slic_ds26522.h"
#define DRV_NAME "ds26522"
#define SLIC_TRANS_LEN 1
#define SLIC_TWO_LEN 2
#define SLIC_THREE_LEN 3
static struct spi_device *g_spi;
MODULE_AUTHOR("Zhao Qiang<>");
/* the read/write format of address is
* w/r|A13|A12|A11|A10|A9|A8|A7|A6|A5|A4|A3|A2|A1|A0|x
static void slic_write(struct spi_device *spi, u16 addr,
u8 data)
u8 temp[3];
addr = bitrev16(addr) >> 1;
data = bitrev8(data);
temp[0] = (u8)((addr >> 8) & 0x7f);
temp[1] = (u8)(addr & 0xfe);
temp[2] = data;
/* write spi addr and value */
spi_write(spi, &temp[0], SLIC_THREE_LEN);
static u8 slic_read(struct spi_device *spi, u16 addr)
u8 temp[2];
u8 data;
addr = bitrev16(addr) >> 1;
temp[0] = (u8)(((addr >> 8) & 0x7f) | 0x80);
temp[1] = (u8)(addr & 0xfe);
spi_write_then_read(spi, &temp[0], SLIC_TWO_LEN, &data,
data = bitrev8(data);
return data;
static bool get_slic_product_code(struct spi_device *spi)
u8 device_id;
device_id = slic_read(spi, DS26522_IDR_ADDR);
if ((device_id & 0xf8) == 0x68)
return true;
return false;
static void ds26522_e1_spec_config(struct spi_device *spi)
/* Receive E1 Mode, Framer Disabled */
slic_write(spi, DS26522_RMMR_ADDR, DS26522_RMMR_E1);
/* Transmit E1 Mode, Framer Disable */
slic_write(spi, DS26522_TMMR_ADDR, DS26522_TMMR_E1);
/* Receive E1 Mode Framer Enable */
slic_write(spi, DS26522_RMMR_ADDR,
slic_read(spi, DS26522_RMMR_ADDR) | DS26522_RMMR_FRM_EN);
/* Transmit E1 Mode Framer Enable */
slic_write(spi, DS26522_TMMR_ADDR,
slic_read(spi, DS26522_TMMR_ADDR) | DS26522_TMMR_FRM_EN);
/* RCR1, receive E1 B8zs & ESF */
slic_write(spi, DS26522_RCR1_ADDR,
DS26522_RCR1_E1_HDB3 | DS26522_RCR1_E1_CCS);
/* RSYSCLK=2.048MHz, RSYNC-Output */
slic_write(spi, DS26522_RIOCR_ADDR,
DS26522_RIOCR_2048KHZ | DS26522_RIOCR_RSIO_OUT);
/* TCR1 Transmit E1 b8zs */
slic_write(spi, DS26522_TCR1_ADDR, DS26522_TCR1_TB8ZS);
/* TSYSCLK=2.048MHz, TSYNC-Output */
slic_write(spi, DS26522_TIOCR_ADDR,
DS26522_TIOCR_2048KHZ | DS26522_TIOCR_TSIO_OUT);
/* Set E1TAF */
slic_write(spi, DS26522_E1TAF_ADDR, DS26522_E1TAF_DEFAULT);
/* Set E1TNAF register */
slic_write(spi, DS26522_E1TNAF_ADDR, DS26522_E1TNAF_DEFAULT);
/* Receive E1 Mode Framer Enable & init Done */
slic_write(spi, DS26522_RMMR_ADDR, slic_read(spi, DS26522_RMMR_ADDR) |
/* Transmit E1 Mode Framer Enable & init Done */
slic_write(spi, DS26522_TMMR_ADDR, slic_read(spi, DS26522_TMMR_ADDR) |
/* Configure LIU E1 mode */
slic_write(spi, DS26522_LTRCR_ADDR, DS26522_LTRCR_E1);
/* E1 Mode default 75 ohm w/Transmit Impedance Matlinking */
slic_write(spi, DS26522_LTITSR_ADDR,
/* E1 Mode default 75 ohm Long Haul w/Receive Impedance Matlinking */
slic_write(spi, DS26522_LRISMR_ADDR,
/* Enable Transmit output */
slic_write(spi, DS26522_LMCR_ADDR, DS26522_LMCR_TE);
static int slic_ds26522_init_configure(struct spi_device *spi)
u16 addr;
/* set clock */
slic_write(spi, DS26522_GTCCR_ADDR, DS26522_GTCCR_BPREFSEL_REFCLKIN |
slic_write(spi, DS26522_GTCR2_ADDR, DS26522_GTCR2_TSSYNCOUT);
slic_write(spi, DS26522_GFCR_ADDR, DS26522_GFCR_BPCLK_2048KHZ);
/* set gtcr */
slic_write(spi, DS26522_GTCR1_ADDR, DS26522_GTCR1);
/* Global LIU Software Reset Register */
slic_write(spi, DS26522_GLSRR_ADDR, DS26522_GLSRR_RESET);
/* Global Framer and BERT Software Reset Register */
slic_write(spi, DS26522_GFSRR_ADDR, DS26522_GFSRR_RESET);
usleep_range(100, 120);
slic_write(spi, DS26522_GLSRR_ADDR, DS26522_GLSRR_NORMAL);
slic_write(spi, DS26522_GFSRR_ADDR, DS26522_GFSRR_NORMAL);
/* Perform RX/TX SRESET,Reset receiver */
slic_write(spi, DS26522_RMMR_ADDR, DS26522_RMMR_SFTRST);
/* Reset tranceiver */
slic_write(spi, DS26522_TMMR_ADDR, DS26522_TMMR_SFTRST);
usleep_range(100, 120);
/* Zero all Framer Registers */
for (addr = DS26522_RF_ADDR_START; addr <= DS26522_RF_ADDR_END;
slic_write(spi, addr, 0);
for (addr = DS26522_TF_ADDR_START; addr <= DS26522_TF_ADDR_END;
slic_write(spi, addr, 0);
for (addr = DS26522_LIU_ADDR_START; addr <= DS26522_LIU_ADDR_END;
slic_write(spi, addr, 0);
for (addr = DS26522_BERT_ADDR_START; addr <= DS26522_BERT_ADDR_END;
slic_write(spi, addr, 0);
/* setup ds26522 for E1 specification */
slic_write(spi, DS26522_GTCR1_ADDR, 0x00);
return 0;
static int slic_ds26522_remove(struct spi_device *spi)
pr_info("DS26522 module uninstalled\n");
return 0;
static int slic_ds26522_probe(struct spi_device *spi)
int ret = 0;
g_spi = spi;
spi->bits_per_word = 8;
if (!get_slic_product_code(spi))
return ret;
ret = slic_ds26522_init_configure(spi);
if (ret == 0)
pr_info("DS26522 cs%d configurated\n", spi->chip_select);
return ret;
static const struct of_device_id slic_ds26522_match[] = {
.compatible = "maxim,ds26522",
static struct spi_driver slic_ds26522_driver = {
.driver = {
.name = "ds26522",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
.of_match_table = slic_ds26522_match,
.probe = slic_ds26522_probe,
.remove = slic_ds26522_remove,
static int __init slic_ds26522_init(void)
return spi_register_driver(&slic_ds26522_driver);
static void __exit slic_ds26522_exit(void)
* drivers/tdm/line_ctrl/slic_ds26522.h
* Copyright 2016 Freescale Semiconductor, Inc.
* Author: Zhao Qiang <>
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
#define DS26522_RF_ADDR_START 0x00
#define DS26522_RF_ADDR_END 0xef
#define DS26522_GLB_ADDR_START 0xf0
#define DS26522_GLB_ADDR_END 0xff
#define DS26522_TF_ADDR_START 0x100
#define DS26522_TF_ADDR_END 0x1ef
#define DS26522_LIU_ADDR_START 0x1000
#define DS26522_LIU_ADDR_END 0x101f
#define DS26522_TEST_ADDR_START 0x1008
#define DS26522_TEST_ADDR_END 0x101f
#define DS26522_BERT_ADDR_START 0x1100
#define DS26522_BERT_ADDR_END 0x110f
#define DS26522_RMMR_ADDR 0x80
#define DS26522_RCR1_ADDR 0x81
#define DS26522_RCR3_ADDR 0x83
#define DS26522_RIOCR_ADDR 0x84
#define DS26522_GTCR1_ADDR 0xf0
#define DS26522_GFCR_ADDR 0xf1
#define DS26522_GTCR2_ADDR 0xf2
#define DS26522_GTCCR_ADDR 0xf3
#define DS26522_GLSRR_ADDR 0xf5
#define DS26522_GFSRR_ADDR 0xf6
#define DS26522_IDR_ADDR 0xf8
#define DS26522_E1TAF_ADDR 0x164
#define DS26522_E1TNAF_ADDR 0x165
#define DS26522_TMMR_ADDR 0x180
#define DS26522_TCR1_ADDR 0x181
#define DS26522_TIOCR_ADDR 0x184
#define DS26522_LTRCR_ADDR 0x1000
#define DS26522_LTITSR_ADDR 0x1001
#define DS26522_LMCR_ADDR 0x1002
#define DS26522_LRISMR_ADDR 0x1007
#define PQ_MDS_8E1T1_BRD_REV 0x00
#define PQ_MDS_8E1T1_PLD_REV 0x00
#define DS26522_GTCCR_BFREQSEL_1544KHZ 0x08
#define DS26522_GTCCR_FREQSEL_1544KHZ 0x04
#define DS26522_GTCCR_BFREQSEL_2048KHZ 0x00
#define DS26522_GTCCR_FREQSEL_2048KHZ 0x00
#define DS26522_GFCR_BPCLK_2048KHZ 0x00
#define DS26522_GTCR2_TSSYNCOUT 0x02
#define DS26522_GTCR1 0x00
#define DS26522_GFSRR_RESET 0x01
#define DS26522_GFSRR_NORMAL 0x00
#define DS26522_GLSRR_RESET 0x01
#define DS26522_GLSRR_NORMAL 0x00
#define DS26522_RMMR_SFTRST 0x02
#define DS26522_RMMR_FRM_EN 0x80
#define DS26522_RMMR_INIT_DONE 0x40
#define DS26522_RMMR_T1 0x00
#define DS26522_RMMR_E1 0x01
#define DS26522_E1TAF_DEFAULT 0x1b
#define DS26522_E1TNAF_DEFAULT 0x40
#define DS26522_TMMR_SFTRST 0x02
#define DS26522_TMMR_FRM_EN 0x80
#define DS26522_TMMR_INIT_DONE 0x40
#define DS26522_TMMR_T1 0x00
#define DS26522_TMMR_E1 0x01
#define DS26522_RCR1_T1_SYNCT 0x80
#define DS26522_RCR1_T1_RB8ZS 0x40
#define DS26522_RCR1_T1_SYNCC 0x08
#define DS26522_RCR1_E1_HDB3 0x40
#define DS26522_RCR1_E1_CCS 0x20
#define DS26522_RIOCR_1544KHZ 0x00
#define DS26522_RIOCR_2048KHZ 0x10
#define DS26522_RIOCR_RSIO_OUT 0x00
#define DS26522_RCR3_FLB 0x01
#define DS26522_TIOCR_1544KHZ 0x00
#define DS26522_TIOCR_2048KHZ 0x10
#define DS26522_TIOCR_TSIO_OUT 0x04
#define DS26522_TCR1_TB8ZS 0x04
#define DS26522_LTRCR_T1 0x02
#define DS26522_LTRCR_E1 0x00
#define DS26522_LTITSR_TLIS_75OHM 0x00
#define DS26522_LTITSR_LBOS_75OHM 0x00
#define DS26522_LTITSR_TLIS_100OHM 0x10
#define DS26522_LTITSR_TLIS_0DB_CSU 0x00
#define DS26522_LRISMR_75OHM 0x00
#define DS26522_LRISMR_100OHM 0x10
#define DS26522_LRISMR_MAX 0x03
#define DS26522_LMCR_TE 0x01
enum line_rate {
LINE_RATE_T1, /* T1 line rate (1.544 Mbps) */
LINE_RATE_E1 /* E1 line rate (2.048 Mbps) */
enum tdm_trans_mode {
enum card_support_type {
LM_CARD = 0,
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