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/*
* drivers/net/wan/slic_ds26522.c
*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
*
* Author:Zhao Qiang<qiang.zhao@nxp.com>
*
* 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_LICENSE("GPL");
MODULE_AUTHOR("Zhao Qiang<B45475@freescale.com>");
/* 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,
SLIC_TRANS_LEN);
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;
else
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) |
DS26522_RMMR_INIT_DONE);
/* Transmit E1 Mode Framer Enable & init Done */
slic_write(spi, DS26522_TMMR_ADDR, slic_read(spi, DS26522_TMMR_ADDR) |
DS26522_TMMR_INIT_DONE);
/* 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,
DS26522_LTITSR_TLIS_75OHM | DS26522_LTITSR_LBOS_75OHM);
/* E1 Mode default 75 ohm Long Haul w/Receive Impedance Matlinking */
slic_write(spi, DS26522_LRISMR_ADDR,
DS26522_LRISMR_75OHM | DS26522_LRISMR_MAX);
/* 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 |
DS26522_GTCCR_BFREQSEL_2048KHZ |
DS26522_GTCCR_FREQSEL_2048KHZ);
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;
addr++)
slic_write(spi, addr, 0);
for (addr = DS26522_TF_ADDR_START; addr <= DS26522_TF_ADDR_END;
addr++)
slic_write(spi, addr, 0);
for (addr = DS26522_LIU_ADDR_START; addr <= DS26522_LIU_ADDR_END;
addr++)
slic_write(spi, addr, 0);
for (addr = DS26522_BERT_ADDR_START; addr <= DS26522_BERT_ADDR_END;
addr++)
slic_write(spi, addr, 0);
/* setup ds26522 for E1 specification */
ds26522_e1_spec_config(spi);
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)
{
spi_unregister_driver(&slic_ds26522_driver);
}
module_init(slic_ds26522_init);
module_exit(slic_ds26522_exit);
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