/*
* Blackfin Infra-red Driver
*
* Copyright 2006-2009 Analog Devices Inc.
*
* Enter bugs at http://blackfin.uclinux.org/
*
* Licensed under the GPL-2 or later.
*
*/
#include <linux/serial.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <net/irda/irda.h>
#include <net/irda/wrapper.h>
#include <net/irda/irda_device.h>
#include <asm/irq.h>
#include <asm/cacheflush.h>
#include <asm/dma.h>
#include <asm/portmux.h>
#ifdef CONFIG_SIR_BFIN_DMA
struct dma_rx_buf {
char *buf;
int head;
int tail;
};
#endif
struct bfin_sir_port {
unsigned char __iomem *membase;
unsigned int irq;
unsigned int lsr;
unsigned long clk;
struct net_device *dev;
#ifdef CONFIG_SIR_BFIN_DMA
int tx_done;
struct dma_rx_buf rx_dma_buf;
struct timer_list rx_dma_timer;
int rx_dma_nrows;
#endif
unsigned int tx_dma_channel;
unsigned int rx_dma_channel;
};
struct bfin_sir_port_res {
unsigned long base_addr;
int irq;
unsigned int rx_dma_channel;
unsigned int tx_dma_channel;
};
struct bfin_sir_self {
struct bfin_sir_port *sir_port;
spinlock_t lock;
unsigned int open;
int speed;
int newspeed;
struct sk_buff *txskb;
struct sk_buff *rxskb;
struct net_device_stats stats;
struct device *dev;
struct irlap_cb *irlap;
struct qos_info qos;
iobuff_t tx_buff;
iobuff_t rx_buff;
struct work_struct work;
int mtt;
};
#define DRIVER_NAME "bfin_sir"
#define SIR_UART_GET_CHAR(port) bfin_read16((port)->membase + OFFSET_RBR)
#define SIR_UART_GET_DLL(port) bfin_read16((port)->membase + OFFSET_DLL)
#define SIR_UART_GET_DLH(port) bfin_read16((port)->membase + OFFSET_DLH)
#define SIR_UART_GET_LCR(port) bfin_read16((port)->membase + OFFSET_LCR)
#define SIR_UART_GET_GCTL(port) bfin_read16((port)->membase + OFFSET_GCTL)
#define SIR_UART_PUT_CHAR(port, v) bfin_write16(((port)->membase + OFFSET_THR), v)
#define SIR_UART_PUT_DLL(port, v) bfin_write16(((port)->membase + OFFSET_DLL), v)
#define SIR_UART_PUT_DLH(port, v) bfin_write16(((port)->membase + OFFSET_DLH), v)
#define SIR_UART_PUT_LCR(port, v) bfin_write16(((port)->membase + OFFSET_LCR), v)
#define SIR_UART_PUT_GCTL(port, v) bfin_write16(((port)->membase + OFFSET_GCTL), v)
#ifdef CONFIG_BF54x
#define SIR_UART_GET_LSR(port) bfin_read16((port)->membase + OFFSET_LSR)
#define SIR_UART_GET_IER(port) bfin_read16((port)->membase + OFFSET_IER_SET)
#define SIR_UART_SET_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_SET), v)
#define SIR_UART_CLEAR_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER_CLEAR), v)
#define SIR_UART_PUT_LSR(port, v) bfin_write16(((port)->membase + OFFSET_LSR), v)
#define SIR_UART_CLEAR_LSR(port) bfin_write16(((port)->membase + OFFSET_LSR), -1)
#define SIR_UART_SET_DLAB(port)
#define SIR_UART_CLEAR_DLAB(port)
#define SIR_UART_ENABLE_INTS(port, v) SIR_UART_SET_IER(port, v)
#define SIR_UART_DISABLE_INTS(port) SIR_UART_CLEAR_IER(port, 0xF)
#define SIR_UART_STOP_TX(port) do { SIR_UART_PUT_LSR(port, TFI); SIR_UART_CLEAR_IER(port, ETBEI); } while (0)
#define SIR_UART_ENABLE_TX(port) do { SIR_UART_SET_IER(port, ETBEI); } while (0)
#define SIR_UART_STOP_RX(port) do { SIR_UART_CLEAR_IER(port, ERBFI); } while (0)
#define SIR_UART_ENABLE_RX(port) do { SIR_UART_SET_IER(port, ERBFI); } while (0)
#else
#define SIR_UART_GET_IIR(port) bfin_read16((port)->membase + OFFSET_IIR)
#define SIR_UART_GET_IER(port) bfin_read16((port)->membase + OFFSET_IER)
#define SIR_UART_PUT_IER(port, v) bfin_write16(((port)->membase + OFFSET_IER), v)
#define SIR_UART_SET_DLAB(port) do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) | DLAB); } while (0)
#define SIR_UART_CLEAR_DLAB(port) do { SIR_UART_PUT_LCR(port, SIR_UART_GET_LCR(port) & ~DLAB); } while (0)
#define SIR_UART_ENABLE_INTS(port, v) SIR_UART_PUT_IER(port, v)
#define SIR_UART_DISABLE_INTS(port) SIR_UART_PUT_IER(port, 0)
#define SIR_UART_STOP_TX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ETBEI); } while (0)
#define SIR_UART_ENABLE_TX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ETBEI); } while (0)
#define SIR_UART_STOP_RX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) & ~ERBFI); } while (0)
#define SIR_UART_ENABLE_RX(port) do { SIR_UART_PUT_IER(port, SIR_UART_GET_IER(port) | ERBFI); } while (0)
static inline unsigned int SIR_UART_GET_LSR(struct bfin_sir_port *port)
{
unsigned int lsr = bfin_read16(port->membase + OFFSET_LSR);
port->lsr |= (lsr & (BI|FE|PE|OE));
return lsr | port->lsr;
}
static inline void SIR_UART_CLEAR_LSR(struct bfin_sir_port *port)
{
port->lsr = 0;
bfin_read16(port->membase + OFFSET_LSR);
}
#endif
static const unsigned short per[][4] = {
/* rx pin tx pin NULL uart_number */
{P_UART0_RX, P_UART0_TX, 0, 0},
{P_UART1_RX, P_UART1_TX, 0, 1},
{P_UART2_RX, P_UART2_TX, 0, 2},
{P_UART3_RX, P_UART3_TX, 0, 3},
};
