path: root/drivers/serial/mpsc.h

/*
 * drivers/serial/mpsc.h
 *
 * Author: Mark A. Greer <mgreer@mvista.com>
 *
 * 2004 (c) MontaVista, Software, Inc.  This file is licensed under
 * the terms of the GNU General Public License version 2.  This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#ifndef	__MPSC_H__
#define	__MPSC_H__

#include <linux/config.h>

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

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/mv643xx.h>

#include <asm/io.h>
#include <asm/irq.h>

#define	MPSC_NUM_CTLRS		2

/*
 * Descriptors and buffers must be cache line aligned.
 * Buffers lengths must be multiple of cache line size.
 * Number of Tx & Rx descriptors must be powers of 2.
 */
#define	MPSC_RXR_ENTRIES	32
#define	MPSC_RXRE_SIZE		dma_get_cache_alignment()
#define	MPSC_RXR_SIZE		(MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE)
#define	MPSC_RXBE_SIZE		dma_get_cache_alignment()
#define	MPSC_RXB_SIZE		(MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE)

#define	MPSC_TXR_ENTRIES	32
#define	MPSC_TXRE_SIZE		dma_get_cache_alignment()
#define	MPSC_TXR_SIZE		(MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE)
#define	MPSC_TXBE_SIZE		dma_get_cache_alignment()
#define	MPSC_TXB_SIZE		(MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE)

#define	MPSC_DMA_ALLOC_SIZE	(MPSC_RXR_SIZE + MPSC_RXB_SIZE +	\
				MPSC_TXR_SIZE + MPSC_TXB_SIZE +		\
				dma_get_cache_alignment() /* for alignment */)

/* Rx and Tx Ring entry descriptors -- assume entry size is <= cacheline size */
struct mpsc_rx_desc {
	u16 bufsize;
	u16 bytecnt;
	u32 cmdstat;
	u32 link;
	u32 buf_ptr;
} __attribute((packed));

struct mpsc_tx_desc {
	u16 bytecnt;
	u16 shadow;
	u32 cmdstat;
	u32 link;
	u32 buf_ptr;
} __attribute((packed));

/*
 * Some regs that have the erratum that you can't read them are are shared
 * between the two MPSC controllers.  This struct contains those shared regs.
 */
struct mpsc_shared_regs {
	phys_addr_t mpsc_routing_base_p;
	phys_addr_t sdma_intr_base_p;

	void __iomem *mpsc_routing_base;
	void __iomem *sdma_intr_base;

	u32 MPSC_MRR_m;
	u32 MPSC_RCRR_m;
	u32 MPSC_TCRR_m;
	u32 SDMA_INTR_CAUSE_m;
	u32 SDMA_INTR_MASK_m;
};

/* The main driver data structure */
struct mpsc_port_info {
	struct uart_port port;	/* Overlay uart_port structure */

	/* Internal driver state for this ctlr */
	u8 ready;
	u8 rcv_data;
	tcflag_t c_iflag;	/* save termios->c_iflag */
	tcflag_t c_cflag;	/* save termios->c_cflag */

	/* Info passed in from platform */
	u8 mirror_regs;		/* Need to mirror regs? */
	u8 cache_mgmt;		/* Need manual cache mgmt? */
	u8 brg_can_tune;	/* BRG has baud tuning? */
	u32 brg_clk_src;
	u16 mpsc_max_idle;
	int default_baud;
	int default_bits;
	int default_parity;
	int default_flow;

	/* Physical addresses of various blocks of registers (from platform) */
	phys_addr_t mpsc_base_p;
	phys_addr_t sdma_base_p;
	phys_addr_t brg_base_p;

	/* Virtual addresses of various blocks of registers (from platform) */
	void __iomem *mpsc_base;
	void __iomem *sdma_base;
	void __iomem *brg_base;

	/* Descriptor ring and buffer allocations */
	void *dma_region;
	dma_addr_t dma_region_p;

	dma_addr_t rxr;		/* Rx descriptor ring */
	dma_addr_t rxr_p;	/* Phys addr of rxr */
	u8 *rxb;		/* Rx Ring I/O buf */
	u8 *rxb_p;		/* Phys addr of rxb */
	u32 rxr_posn;		/* First desc w/ Rx data */

	dma_addr_t txr;		/* Tx descriptor ring */
	dma_addr_t txr_p;	/* Phys addr of txr */
	u8 *txb;		/* Tx Ring I/O buf */
	u8 *txb_p;		/* Phys addr of txb */
	int txr_head;		/* Where new data goes */
	int txr_tail;		/* Where sent data comes off */

	/* Mirrored values of regs we can't read (if 'mirror_regs' set) */
	u32 MPSC_MPCR_m;
	u32 MPSC_CHR_1_m;
	u32 MPSC_CHR_2_m;
	u32 MPSC_CHR_10_m;
	u32 BRG_BCR_m;
	struct mpsc_shared_regs *shared_regs;
};

/* Hooks to platform-specific code */
int mpsc_platform_register_driver(void);
void mpsc_platform_unregister_driver(void);

/* Hooks back in to mpsc common to be called by platform-specific code */
struct mpsc_port_info *mpsc_device_probe(int index);
struct mpsc_port_info *mpsc_device_remove(int index);

/*
 *****************************************************************************
 *
 *	Multi-Protocol Serial Controller Interface Registers
 *
 *****************************************************************************
 */

/* Main Configuratino Register Offsets */
#define	MPSC_MMCRL			0x0000
#define	MPSC_MMCRH			0x0004
#define	MPSC_MPCR			0x0008
#define	MPSC_CHR_1			0x000c
#define	MPSC_CHR_2			0x0010
#define	MPSC_CHR_3			0x0014
#define	MPSC_CHR_4			0x0018
#define	MPSC_CHR_5			0x001c
#define	MPSC_CHR_6			0x0020
#define	MPSC_CHR_7			0x0024
#define	MPSC_CHR_8			0x0028
#define	MPSC_CHR_9			0x002c
#define	MPSC_CHR_10			0x0030
#define	MPSC_CHR_11			0x0034

#define	MPSC_MPCR_FRZ			(1 << 9)
#define	MPSC_MPCR_CL_5			0
#define	MPSC_MPCR_CL_6			1
#define	MPSC_MPCR_CL_7			2
#define	MPSC_MPCR_CL_8			3
#define	MPSC_MPCR_SBL_1			0
#define	MPSC_MPCR_SBL_2			1

#define	MPSC_CHR_2_TEV			(1<<1)
#define	MPSC_CHR_2_TA			(1<<7)
#define	MPSC_CHR_2_TTCS			(1<<9)
#define	MPSC_CHR_2_REV			(1<<17)
#define	MPSC_CHR_2_RA			(1<<23)
#define	MPSC_CHR_2_CRD			(1<<25)
#define	MPSC_CHR_2_EH			(1<<31)
#define	MPSC_CHR_2_PAR_ODD		0
#define	MPSC_CHR_2_PAR_SPACE		1
#define	MPSC_CHR_2_PAR_EVEN		2
#define	MPSC_CHR_2_PAR_MARK		3

/* MPSC Signal Routing */
#define	MPSC_MRR			0x0000
#define	MPSC_RCRR			0x0004
#define	MPSC_TCRR			0x0008

/*
 *****************************************************************************
 *
 *	Serial DMA Controller Interface Registers
 *
 *****************************************************************************
 */

#define	SDMA_SDC			0x0000
#define	SDMA_SDCM			0x0008
#define	SDMA_RX_DESC			0x0800
#define	SDMA_RX_BUF_PTR			0x0808
#define	SDMA_SCRDP			0x0810
#define	SDMA_TX_DESC			0x0c00
#define	SDMA_SCTDP			0x0c10
#define	SDMA_SFTDP			0x0c14

#define	SDMA_DESC_CMDSTAT_PE		(1<<0)
#define	SDMA_DESC_CMDSTAT_CDL		(1<<1)
#define	SDMA_DESC_CMDSTAT_FR		(1<<3)
#define	SDMA_DESC_CMDSTAT_OR		(1<<6)
#define	SDMA_DESC_CMDSTAT_BR		(1<<9)
#define	SDMA_DESC_CMDSTAT_MI		(1<<10)
#define	SDMA_DESC_CMDSTAT_A		(1<<11)
#define	SDMA_DESC_CMDSTAT_AM		(1<<12)
#define	SDMA_DESC_CMDSTAT_CT		(1<<13)
#define	SDMA_DESC_CMDSTAT_C		(1<<14)
#define	SDMA_DESC_CMDSTAT_ES		(1<<15)
#define	SDMA_DESC_CMDSTAT_L		(1<<16)
#define	SDMA_DESC_CMDSTAT_F		(1<<17)
#define	SDMA_DESC_CMDSTAT_P		(1<<18)
#define	SDMA_DESC_CMDSTAT_EI		(1<<23)
#define	SDMA_DESC_CMDSTAT_O		(1<<31)

#define SDMA_DESC_DFLT			(SDMA_DESC_CMDSTAT_O |	\
					SDMA_DESC_CMDSTAT_EI)

#define	SDMA_SDC_RFT			(1<<0)
#define	SDMA_SDC_SFM			(1<<1)
#define	SDMA_SDC_BLMR			(1<<6)
#define	SDMA_SDC_BLMT			(1<<7)
#define	SDMA_SDC_POVR			(1<<8)
#define	SDMA_SDC_RIFB			(1<<9)

#define	SDMA_SDCM_ERD			(1<<7)
#define	SDMA_SDCM_AR			(1<<15)
#define	SDMA_SDCM_STD			(1<<16)
#define	SDMA_SDCM_TXD			(1<<23)
#define	SDMA_SDCM_AT			(1<<31)

#define	SDMA_0_CAUSE_RXBUF		(1<<0)
#define	SDMA_0_CAUSE_RXERR		(1<<1)
#define	SDMA_0_CAUSE_TXBUF		(1<<2)
#define	SDMA_0_CAUSE_TXEND		(1<<3)
#define	SDMA_1_CAUSE_RXBUF		(1<<8)
#define	SDMA_1_CAUSE_RXERR		(1<<9)
#define	SDMA_1_CAUSE_TXBUF		(1<<10)
#define	SDMA_1_CAUSE_TXEND		(1<<11)

#define	SDMA_CAUSE_RX_MASK	(SDMA_0_CAUSE_RXBUF | SDMA_0_CAUSE_RXERR | \
	SDMA_1_CAUSE_RXBUF | SDMA_1_CAUSE_RXERR)
#define	SDMA_CAUSE_TX_MASK	(SDMA_0_CAUSE_TXBUF | SDMA_0_CAUSE_TXEND | \
	SDMA_1_CAUSE_TXBUF | SDMA_1_CAUSE_TXEND)

/* SDMA Interrupt registers */
#define	SDMA_INTR_CAUSE			0x0000
#define	SDMA_INTR_MASK			0x0080

/*
 *****************************************************************************
 *
 *	Baud Rate Generator Interface Registers
 *
 *****************************************************************************
 */

#define	BRG_BCR				0x0000
#define	BRG_BTR				0x0004

#endif				/* __MPSC_H__ */