cpm_uart.h

/*
 *  linux/drivers/serial/cpm_uart.h
 *
 *  Driver for CPM (SCC/SMC) serial ports
 *
 *  Copyright (C) 2004 Freescale Semiconductor, Inc.
 *
 *  2006 (c) MontaVista Software, Inc.
 * 	Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * 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 CPM_UART_H
#define CPM_UART_H

#include <linux/platform_device.h>
#include <linux/fs_uart_pd.h>

#if defined(CONFIG_CPM2)
#include "cpm_uart_cpm2.h"
#elif defined(CONFIG_8xx)
#include "cpm_uart_cpm1.h"
#endif

#define SERIAL_CPM_MAJOR	204
#define SERIAL_CPM_MINOR	46

#define IS_SMC(pinfo) 		(pinfo->flags & FLAG_SMC)
#define IS_DISCARDING(pinfo)	(pinfo->flags & FLAG_DISCARDING)
#define FLAG_DISCARDING	0x00000004	/* when set, don't discard */
#define FLAG_SMC	0x00000002
#define FLAG_CONSOLE	0x00000001

#define UART_SMC1	fsid_smc1_uart
#define UART_SMC2	fsid_smc2_uart
#define UART_SCC1	fsid_scc1_uart
#define UART_SCC2	fsid_scc2_uart
#define UART_SCC3	fsid_scc3_uart
#define UART_SCC4	fsid_scc4_uart

#define UART_NR		fs_uart_nr

#define RX_NUM_FIFO	4
#define RX_BUF_SIZE	32
#define TX_NUM_FIFO	4
#define TX_BUF_SIZE	32

#define SCC_WAIT_CLOSING 100

struct uart_cpm_port {
	struct uart_port	port;
	u16			rx_nrfifos;
	u16			rx_fifosize;
	u16			tx_nrfifos;
	u16			tx_fifosize;
	smc_t			*smcp;
	smc_uart_t		*smcup;
	scc_t			*sccp;
	scc_uart_t		*sccup;
	volatile cbd_t		*rx_bd_base;
	volatile cbd_t		*rx_cur;
	volatile cbd_t		*tx_bd_base;
	volatile cbd_t		*tx_cur;
	unsigned char		*tx_buf;
	unsigned char		*rx_buf;
	u32			flags;
	void			(*set_lineif)(struct uart_cpm_port *);
	u8			brg;
	uint			 dp_addr;
	void			*mem_addr;
	dma_addr_t		 dma_addr;
	u32			mem_size;
	/* helpers */
	int			 baud;
	int			 bits;
	/* Keep track of 'odd' SMC2 wirings */
	int			is_portb;
	/* wait on close if needed */
	int 			wait_closing;
};

extern int cpm_uart_port_map[UART_NR];
extern int cpm_uart_nr;
extern struct uart_cpm_port cpm_uart_ports[UART_NR];

/* these are located in their respective files */
void cpm_line_cr_cmd(int line, int cmd);
int cpm_uart_init_portdesc(void);
int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con);
void cpm_uart_freebuf(struct uart_cpm_port *pinfo);

void smc1_lineif(struct uart_cpm_port *pinfo);
void smc2_lineif(struct uart_cpm_port *pinfo);
void scc1_lineif(struct uart_cpm_port *pinfo);
void scc2_lineif(struct uart_cpm_port *pinfo);
void scc3_lineif(struct uart_cpm_port *pinfo);
void scc4_lineif(struct uart_cpm_port *pinfo);

/*
   virtual to phys transtalion
*/
static inline unsigned long cpu2cpm_addr(void* addr, struct uart_cpm_port *pinfo)
{
	int offset;
	u32 val = (u32)addr;
	/* sane check */
	if (likely((val >= (u32)pinfo->mem_addr)) &&
			(val<((u32)pinfo->mem_addr + pinfo->mem_size))) {
		offset = val - (u32)pinfo->mem_addr;
		return pinfo->dma_addr+offset;
	}
	/* something nasty happened */
	BUG();
	return 0;
}

static inline void *cpm2cpu_addr(unsigned long addr, struct uart_cpm_port *pinfo)
{
	int offset;
	u32 val = addr;
	/* sane check */
	if (likely((val >= pinfo->dma_addr) &&
			(val<(pinfo->dma_addr + pinfo->mem_size)))) {
		offset = val - (u32)pinfo->dma_addr;
		return (void*)(pinfo->mem_addr+offset);
	}
	/* something nasty happened */
	BUG();
	return 0;
}


#endif /* CPM_UART_H */