path: root/drivers/tty/serial/sccnxp.c

/*
 *  NXP (Philips) SCC+++(SCN+++) serial driver
 *
 *  Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
 *
 *  Based on sc26xx.c, by Thomas Bogendörfer (tsbogend@alpha.franken.de)
 *
 * 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.
 */

#if defined(CONFIG_SERIAL_SCCNXP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/console.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/io.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/platform_data/serial-sccnxp.h>
#include <linux/regulator/consumer.h>

#define SCCNXP_NAME			"uart-sccnxp"
#define SCCNXP_MAJOR			204
#define SCCNXP_MINOR			205

#define SCCNXP_MR_REG			(0x00)
#	define MR0_BAUD_NORMAL		(0 << 0)
#	define MR0_BAUD_EXT1		(1 << 0)
#	define MR0_BAUD_EXT2		(5 << 0)
#	define MR0_FIFO			(1 << 3)
#	define MR0_TXLVL		(1 << 4)
#	define MR1_BITS_5		(0 << 0)
#	define MR1_BITS_6		(1 << 0)
#	define MR1_BITS_7		(2 << 0)
#	define MR1_BITS_8		(3 << 0)
#	define MR1_PAR_EVN		(0 << 2)
#	define MR1_PAR_ODD		(1 << 2)
#	define MR1_PAR_NO		(4 << 2)
#	define MR2_STOP1		(7 << 0)
#	define MR2_STOP2		(0xf << 0)
#define SCCNXP_SR_REG			(0x01)
#define SCCNXP_CSR_REG			SCCNXP_SR_REG
#	define SR_RXRDY			(1 << 0)
#	define SR_FULL			(1 << 1)
#	define SR_TXRDY			(1 << 2)
#	define SR_TXEMT			(1 << 3)
#	define SR_OVR			(1 << 4)
#	define SR_PE			(1 << 5)
#	define SR_FE			(1 << 6)
#	define SR_BRK			(1 << 7)
#define SCCNXP_CR_REG			(0x02)
#	define CR_RX_ENABLE		(1 << 0)
#	define CR_RX_DISABLE		(1 << 1)
#	define CR_TX_ENABLE		(1 << 2)
#	define CR_TX_DISABLE		(1 << 3)
#	define CR_CMD_MRPTR1		(0x01 << 4)
#	define CR_CMD_RX_RESET		(0x02 << 4)
#	define CR_CMD_TX_RESET		(0x03 << 4)
#	define CR_CMD_STATUS_RESET	(0x04 << 4)
#	define CR_CMD_BREAK_RESET	(0x05 << 4)
#	define CR_CMD_START_BREAK	(0x06 << 4)
#	define CR_CMD_STOP_BREAK	(0x07 << 4)
#	define CR_CMD_MRPTR0		(0x0b << 4)
#define SCCNXP_RHR_REG			(0x03)
#define SCCNXP_THR_REG			SCCNXP_RHR_REG
#define SCCNXP_IPCR_REG			(0x04)
#define SCCNXP_ACR_REG			SCCNXP_IPCR_REG
#	define ACR_BAUD0		(0 << 7)
#	define ACR_BAUD1		(1 << 7)
#	define ACR_TIMER_MODE		(6 << 4)
#define SCCNXP_ISR_REG			(0x05)
#define SCCNXP_IMR_REG			SCCNXP_ISR_REG
#	define IMR_TXRDY		(1 << 0)
#	define IMR_RXRDY		(1 << 1)
#	define ISR_TXRDY(x)		(1 << ((x * 4) + 0))
#	define ISR_RXRDY(x)		(1 << ((x * 4) + 1))
#define SCCNXP_IPR_REG			(0x0d)
#define SCCNXP_OPCR_REG			SCCNXP_IPR_REG
#define SCCNXP_SOP_REG			(0x0e)
#define SCCNXP_ROP_REG			(0x0f)

/* Route helpers */
#define MCTRL_MASK(sig)			(0xf << (sig))
#define MCTRL_IBIT(cfg, sig)		((((cfg) >> (sig)) & 0xf) - LINE_IP0)
#define MCTRL_OBIT(cfg, sig)		((((cfg) >> (sig)) & 0xf) - LINE_OP0)

#define SCCNXP_HAVE_IO		0x00000001
#define SCCNXP_HAVE_MR0		0x00000002

struct sccnxp_chip {
	const char		*name;
	unsigned int		nr;
	unsigned long		freq_min;
	unsigned long		freq_std;
	unsigned long		freq_max;
	unsigned int		flags;
	unsigned int		fifosize;
};

struct sccnxp_port {
	struct uart_driver	uart;
	struct uart_port	port[SCCNXP_MAX_UARTS];
	bool			opened[SCCNXP_MAX_UARTS];

	int			irq;
	u8			imr;

	struct sccnxp_chip	*chip;

#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
	struct console		console;
#endif

	spinlock_t		lock;

	bool			poll;
	struct timer_list	timer;

	struct sccnxp_pdata	pdata;

	struct regulator	*regulator;
};

static const struct sccnxp_chip sc2681 = {
	.name		= "SC2681",
	.nr		= 2,
	.freq_min	= 1000000,
	.freq_std	= 3686400,
	.freq_max	= 4000000,
	.flags		= SCCNXP_HAVE_IO,
	.fifosize	= 3,
};

static const struct sccnxp_chip sc2691 = {
	.name		= "SC2691",
	.nr		= 1,
	.freq_min	= 1000000,
	.freq_std	= 3686400,
	.freq_max	= 4000000,
	.flags		= 0,
	.fifosize	= 3,
};

static const struct sccnxp_chip sc2692 = {
	.name		= "SC2692",
	.nr		= 2,
	.freq_min	= 1000000,
	.freq_std	= 3686400,
	.freq_max	= 4000000,
	.flags		= SCCNXP_HAVE_IO,
	.fifosize	= 3,
};

static const struct sccnxp_chip sc2891 = {
	.name		= "SC2891",
	.nr		= 1,
	.freq_min	= 100000,
	.freq_std	= 3686400,
	.freq_max	= 8000000,
	.flags		= SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
	.fifosize	= 16,
};

static const struct sccnxp_chip sc2892 = {
	.name		= "SC2892",
	.nr		= 2,
	.freq_min	= 100000,
	.freq_std	= 3686400,
	.freq_max	= 8000000,
	.flags		= SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
	.fifosize	= 16,
};

static const struct sccnxp_chip sc28202 = {
	.name		= "SC28202",
	.nr		= 2,
	.freq_min	= 1000000,
	.freq_std	= 14745600,
	.freq_max	= 50000000,
	.flags		= SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0,
	.fifosize	= 256,
};

static const struct sccnxp_chip sc68681 = {
	.name		= "SC68681",
	.