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linux/drivers/tty/serial/sirfsoc_uart.h
Qipan Li 8316d04c42 serial: sirf: add DMA support using dmaengine APIs 
if we get the valid dma channels from dts, move to use dmaengine to do
rx/tx. because the dma hardware requires dma address and length to be
4bytes aligned, in this driver, we will still use PIO for non-aligned
bytes, and use dma for aligned bytes.

for rx, to keep the dmaengine always active, we use double-buffer, so
we issue two dma_desc at first, and maintain the status of both
1. dma transfer done: update in rx dma finish callback
2. dma buffer is inserted into tty: update in rx dma finish tasklet and
   rx timeout tasklet
so we re-issue the dma_desc only if both 1&2 are finished.

for tx, as we know the actual length for every transfer, we don't need
the above double buffering.

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-19 17:13:22 -07:00

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/*
* Drivers for CSR SiRFprimaII onboard UARTs.
*
* Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
*
* Licensed under GPLv2 or later.
*/
#include <linux/bitops.h>
struct sirfsoc_uart_param {
const char *uart_name;
const char *port_name;
u32 uart_nr;
u32 register_uart_nr;
};
struct sirfsoc_register {
/* hardware uart specific */
u32 sirfsoc_line_ctrl;
u32 sirfsoc_divisor;
/* uart - usp common */
u32 sirfsoc_tx_rx_en;
u32 sirfsoc_int_en_reg;
u32 sirfsoc_int_st_reg;
u32 sirfsoc_tx_dma_io_ctrl;
u32 sirfsoc_tx_dma_io_len;
u32 sirfsoc_tx_fifo_ctrl;
u32 sirfsoc_tx_fifo_level_chk;
u32 sirfsoc_tx_fifo_op;
u32 sirfsoc_tx_fifo_status;
u32 sirfsoc_tx_fifo_data;
u32 sirfsoc_rx_dma_io_ctrl;
u32 sirfsoc_rx_dma_io_len;
u32 sirfsoc_rx_fifo_ctrl;
u32 sirfsoc_rx_fifo_level_chk;
u32 sirfsoc_rx_fifo_op;
u32 sirfsoc_rx_fifo_status;
u32 sirfsoc_rx_fifo_data;
u32 sirfsoc_afc_ctrl;
u32 sirfsoc_swh_dma_io;
/* hardware usp specific */
u32 sirfsoc_mode1;
u32 sirfsoc_mode2;
u32 sirfsoc_tx_frame_ctrl;
u32 sirfsoc_rx_frame_ctrl;
u32 sirfsoc_async_param_reg;
};
typedef u32 (*fifo_full_mask)(int line);
typedef u32 (*fifo_empty_mask)(int line);
struct sirfsoc_fifo_status {
fifo_full_mask ff_full;
fifo_empty_mask ff_empty;
};
struct sirfsoc_int_en {
u32 sirfsoc_rx_done_en;
u32 sirfsoc_tx_done_en;
u32 sirfsoc_rx_oflow_en;
u32 sirfsoc_tx_allout_en;
u32 sirfsoc_rx_io_dma_en;
u32 sirfsoc_tx_io_dma_en;
u32 sirfsoc_rxfifo_full_en;
u32 sirfsoc_txfifo_empty_en;
u32 sirfsoc_rxfifo_thd_en;
u32 sirfsoc_txfifo_thd_en;
u32 sirfsoc_frm_err_en;
u32 sirfsoc_rxd_brk_en;
u32 sirfsoc_rx_timeout_en;
u32 sirfsoc_parity_err_en;
u32 sirfsoc_cts_en;
u32 sirfsoc_rts_en;
};
struct sirfsoc_int_status {
u32 sirfsoc_rx_done;
u32 sirfsoc_tx_done;
u32 sirfsoc_rx_oflow;
u32 sirfsoc_tx_allout;
u32 sirfsoc_rx_io_dma;
u32 sirfsoc_tx_io_dma;
u32 sirfsoc_rxfifo_full;
u32 sirfsoc_txfifo_empty;
u32 sirfsoc_rxfifo_thd;
u32 sirfsoc_txfifo_thd;
u32 sirfsoc_frm_err;
u32 sirfsoc_rxd_brk;
u32 sirfsoc_rx_timeout;
u32 sirfsoc_parity_err;
u32 sirfsoc_cts;
u32 sirfsoc_rts;
};
enum sirfsoc_uart_type {
SIRF_REAL_UART,
SIRF_USP_UART,
};
struct sirfsoc_uart_register {
struct sirfsoc_register uart_reg;
struct sirfsoc_int_en uart_int_en;
struct sirfsoc_int_status uart_int_st;
struct sirfsoc_fifo_status fifo_status;
struct sirfsoc_uart_param uart_param;
enum sirfsoc_uart_type uart_type;
};
u32 usp_ff_full(int line)
{
return 0x80;
}
u32 usp_ff_empty(int line)
{
return 0x100;
}
u32 uart_ff_full(int line)
{
return (line == 1) ? (0x20) : (0x80);
}
u32 uart_ff_empty(int line)
{
return (line == 1) ? (0x40) : (0x100);
}
struct sirfsoc_uart_register sirfsoc_usp = {
.uart_reg = {
.sirfsoc_mode1 = 0x0000,
.sirfsoc_mode2 = 0x0004,
.sirfsoc_tx_frame_ctrl = 0x0008,
.sirfsoc_rx_frame_ctrl = 0x000c,
.sirfsoc_tx_rx_en = 0x0010,
.sirfsoc_int_en_reg = 0x0014,
.sirfsoc_int_st_reg = 0x0018,
.sirfsoc_async_param_reg = 0x0024,
.sirfsoc_tx_dma_io_ctrl = 0x0100,
.sirfsoc_tx_dma_io_len = 0x0104,
.sirfsoc_tx_fifo_ctrl = 0x0108,
.sirfsoc_tx_fifo_level_chk = 0x010c,
.sirfsoc_tx_fifo_op = 0x0110,
.sirfsoc_tx_fifo_status = 0x0114,
.sirfsoc_tx_fifo_data = 0x0118,
.sirfsoc_rx_dma_io_ctrl = 0x0120,
.sirfsoc_rx_dma_io_len = 0x0124,
.sirfsoc_rx_fifo_ctrl = 0x0128,
.sirfsoc_rx_fifo_level_chk = 0x012c,
.sirfsoc_rx_fifo_op = 0x0130,
.sirfsoc_rx_fifo_status = 0x0134,
.sirfsoc_rx_fifo_data = 0x0138,
},
.uart_int_en = {
.sirfsoc_rx_done_en = BIT(0),
.sirfsoc_tx_done_en = BIT(1),
.sirfsoc_rx_oflow_en = BIT(2),
.sirfsoc_tx_allout_en = BIT(3),
.sirfsoc_rx_io_dma_en = BIT(4),
.sirfsoc_tx_io_dma_en = BIT(5),
.sirfsoc_rxfifo_full_en = BIT(6),
.sirfsoc_txfifo_empty_en = BIT(7),
.sirfsoc_rxfifo_thd_en = BIT(8),
.sirfsoc_txfifo_thd_en = BIT(9),
.sirfsoc_frm_err_en = BIT(10),
.sirfsoc_rx_timeout_en = BIT(11),
.sirfsoc_rxd_brk_en = BIT(15),
},
.uart_int_st = {
.sirfsoc_rx_done = BIT(0),
.sirfsoc_tx_done = BIT(1),
.sirfsoc_rx_oflow = BIT(2),
.sirfsoc_tx_allout = BIT(3),
.sirfsoc_rx_io_dma = BIT(4),
.sirfsoc_tx_io_dma = BIT(5),
.sirfsoc_rxfifo_full = BIT(6),
.sirfsoc_txfifo_empty = BIT(7),
.sirfsoc_rxfifo_thd = BIT(8),
.sirfsoc_txfifo_thd = BIT(9),
.sirfsoc_frm_err = BIT(10),
.sirfsoc_rx_timeout = BIT(11),
.sirfsoc_rxd_brk = BIT(15),
},
.fifo_status = {
.ff_full = usp_ff_full,
.ff_empty = usp_ff_empty,
},
.uart_param = {
.uart_name = "ttySiRF",
.port_name = "sirfsoc-uart",
.uart_nr = 2,
.register_uart_nr = 3,
},
};
struct sirfsoc_uart_register sirfsoc_uart = {
.uart_reg = {
.sirfsoc_line_ctrl = 0x0040,
.sirfsoc_tx_rx_en = 0x004c,
.sirfsoc_divisor = 0x0050,
.sirfsoc_int_en_reg = 0x0054,
.sirfsoc_int_st_reg = 0x0058,
.sirfsoc_tx_dma_io_ctrl = 0x0100,
.sirfsoc_tx_dma_io_len = 0x0104,
.sirfsoc_tx_fifo_ctrl = 0x0108,
.sirfsoc_tx_fifo_level_chk = 0x010c,
.sirfsoc_tx_fifo_op = 0x0110,
.sirfsoc_tx_fifo_status = 0x0114,
.sirfsoc_tx_fifo_data = 0x0118,
.sirfsoc_rx_dma_io_ctrl = 0x0120,
.sirfsoc_rx_dma_io_len = 0x0124,
.sirfsoc_rx_fifo_ctrl = 0x0128,
.sirfsoc_rx_fifo_level_chk = 0x012c,
.sirfsoc_rx_fifo_op = 0x0130,
.sirfsoc_rx_fifo_status = 0x0134,
.sirfsoc_rx_fifo_data = 0x0138,
.sirfsoc_afc_ctrl = 0x0140,
.sirfsoc_swh_dma_io = 0x0148,
},
.uart_int_en = {
.sirfsoc_rx_done_en = BIT(0),
.sirfsoc_tx_done_en = BIT(1),
.sirfsoc_rx_oflow_en = BIT(2),
.sirfsoc_tx_allout_en = BIT(3),
.sirfsoc_rx_io_dma_en = BIT(4),
.sirfsoc_tx_io_dma_en = BIT(5),
.sirfsoc_rxfifo_full_en = BIT(6),
.sirfsoc_txfifo_empty_en = BIT(7),
.sirfsoc_rxfifo_thd_en = BIT(8),
.sirfsoc_txfifo_thd_en = BIT(9),
.sirfsoc_frm_err_en = BIT(10),
.sirfsoc_rxd_brk_en = BIT(11),
.sirfsoc_rx_timeout_en = BIT(12),
.sirfsoc_parity_err_en = BIT(13),
.sirfsoc_cts_en = BIT(14),
.sirfsoc_rts_en = BIT(15),
},
.uart_int_st = {
.sirfsoc_rx_done = BIT(0),
.sirfsoc_tx_done = BIT(1),
.sirfsoc_rx_oflow = BIT(2),
.sirfsoc_tx_allout = BIT(3),
.sirfsoc_rx_io_dma = BIT(4),
.sirfsoc_tx_io_dma = BIT(5),
.sirfsoc_rxfifo_full = BIT(6),
.sirfsoc_txfifo_empty = BIT(7),
.sirfsoc_rxfifo_thd = BIT(8),
.sirfsoc_txfifo_thd = BIT(9),
.sirfsoc_frm_err = BIT(10),
.sirfsoc_rxd_brk = BIT(11),
.sirfsoc_rx_timeout = BIT(12),
.sirfsoc_parity_err = BIT(13),
.sirfsoc_cts = BIT(14),
.sirfsoc_rts = BIT(15),
},
.fifo_status = {
.ff_full = uart_ff_full,
.ff_empty = uart_ff_empty,
},
.uart_param = {
.uart_name = "ttySiRF",
.port_name = "sirfsoc_uart",
.uart_nr = 3,
.register_uart_nr = 0,
},
};
/* uart io ctrl */
#define SIRFUART_DATA_BIT_LEN_MASK 0x3
#define SIRFUART_DATA_BIT_LEN_5 BIT(0)
#define SIRFUART_DATA_BIT_LEN_6 1
#define SIRFUART_DATA_BIT_LEN_7 2
#define SIRFUART_DATA_BIT_LEN_8 3
#define SIRFUART_STOP_BIT_LEN_1 0
#define SIRFUART_STOP_BIT_LEN_2 BIT(2)
#define SIRFUART_PARITY_EN BIT(3)
#define SIRFUART_EVEN_BIT BIT(4)
#define SIRFUART_STICK_BIT_MASK (7 << 3)
#define SIRFUART_STICK_BIT_NONE (0 << 3)
#define SIRFUART_STICK_BIT_EVEN BIT(3)
#define SIRFUART_STICK_BIT_ODD (3 << 3)
#define SIRFUART_STICK_BIT_MARK (5 << 3)
#define SIRFUART_STICK_BIT_SPACE (7 << 3)
#define SIRFUART_SET_BREAK BIT(6)
#define SIRFUART_LOOP_BACK BIT(7)
#define SIRFUART_PARITY_MASK (7 << 3)
#define SIRFUART_DUMMY_READ BIT(16)
#define SIRFUART_AFC_CTRL_RX_THD 0x70
#define SIRFUART_AFC_RX_EN BIT(8)
#define SIRFUART_AFC_TX_EN BIT(9)
#define SIRFUART_AFC_CTS_CTRL BIT(10)
#define SIRFUART_AFC_RTS_CTRL BIT(11)
#define SIRFUART_AFC_CTS_STATUS BIT(12)
#define SIRFUART_AFC_RTS_STATUS BIT(13)
/* UART FIFO Register */
#define SIRFUART_FIFO_STOP 0x0
#define SIRFUART_FIFO_RESET BIT(0)
#define SIRFUART_FIFO_START BIT(1)
#define SIRFUART_RX_EN BIT(0)
#define SIRFUART_TX_EN BIT(1)
#define SIRFUART_IO_MODE BIT(0)
#define SIRFUART_DMA_MODE 0x0
/* Macro Specific*/
#define SIRFUART_INT_EN_CLR 0x0060
/* Baud Rate Calculation */
#define SIRF_MIN_SAMPLE_DIV 0xf
#define SIRF_MAX_SAMPLE_DIV 0x3f
#define SIRF_IOCLK_DIV_MAX 0xffff
#define SIRF_SAMPLE_DIV_SHIFT 16
#define SIRF_IOCLK_DIV_MASK 0xffff
#define SIRF_SAMPLE_DIV_MASK 0x3f0000
#define SIRF_BAUD_RATE_SUPPORT_NR 18
/* USP SPEC */
#define SIRFSOC_USP_ENDIAN_CTRL_LSBF BIT(4)
#define SIRFSOC_USP_EN BIT(5)
/* USP-UART Common */
#define SIRFSOC_UART_RX_TIMEOUT(br, to) (((br) * (((to) + 999) / 1000)) / 1000)
#define SIRFUART_RECV_TIMEOUT_VALUE(x) \
(((x) > 0xFFFF) ? 0xFFFF : ((x) & 0xFFFF))
#define SIRFUART_RECV_TIMEOUT(port, x) \
(((port)->line > 2) ? (x & 0xFFFF) : ((x) & 0xFFFF) << 16)
#define SIRFUART_FIFO_THD(port) ((port->line) == 1 ? 16 : 64)
#define SIRFUART_ERR_INT_STAT(port, unit_st) \
(uint_st->sirfsoc_rx_oflow | \
uint_st->sirfsoc_frm_err | \
uint_st->sirfsoc_rxd_brk | \
((port->line > 2) ? 0 : uint_st->sirfsoc_parity_err))
#define SIRFUART_RX_IO_INT_EN(port, uint_en) \
(uint_en->sirfsoc_rx_timeout_en |\
uint_en->sirfsoc_rxfifo_thd_en |\
uint_en->sirfsoc_rxfifo_full_en |\
uint_en->sirfsoc_frm_err_en |\
uint_en->sirfsoc_rx_oflow_en |\
uint_en->sirfsoc_rxd_brk_en |\
((port->line > 2) ? 0 : uint_en->sirfsoc_parity_err_en))
#define SIRFUART_RX_IO_INT_ST(uint_st) \
(uint_st->sirfsoc_rx_timeout |\
uint_st->sirfsoc_rxfifo_thd |\
uint_st->sirfsoc_rxfifo_full)
#define SIRFUART_CTS_INT_ST(uint_st) (uint_st->sirfsoc_cts)
#define SIRFUART_RX_DMA_INT_EN(port, uint_en) \
(uint_en->sirfsoc_rx_timeout_en |\
uint_en->sirfsoc_frm_err_en |\
uint_en->sirfsoc_rx_oflow_en |\
uint_en->sirfsoc_rxd_brk_en |\
((port->line > 2) ? 0 : uint_en->sirfsoc_parity_err_en))
/* Generic Definitions */
#define SIRFSOC_UART_NAME "ttySiRF"
#define SIRFSOC_UART_MAJOR 0
#define SIRFSOC_UART_MINOR 0
#define SIRFUART_PORT_NAME "sirfsoc-uart"
#define SIRFUART_MAP_SIZE 0x200
#define SIRFSOC_UART_NR 5
#define SIRFSOC_PORT_TYPE 0xa5
/* Baud Rate Calculation */
#define SIRF_MIN_SAMPLE_DIV 0xf
#define SIRF_MAX_SAMPLE_DIV 0x3f
#define SIRF_IOCLK_DIV_MAX 0xffff
#define SIRF_SAMPLE_DIV_SHIFT 16
#define SIRF_IOCLK_DIV_MASK 0xffff
#define SIRF_SAMPLE_DIV_MASK 0x3f0000
#define SIRF_BAUD_RATE_SUPPORT_NR 18
/* Uart Common Use Macro*/
#define SIRFSOC_RX_DMA_BUF_SIZE 256
#define BYTES_TO_ALIGN(dma_addr) ((unsigned long)(dma_addr) & 0x3)
#define LOOP_DMA_BUFA_FILL 1
#define LOOP_DMA_BUFB_FILL 2
#define TX_TRAN_PIO 1
#define TX_TRAN_DMA 2
/* Uart Fifo Level Chk */
#define SIRFUART_TX_FIFO_SC_OFFSET 0
#define SIRFUART_TX_FIFO_LC_OFFSET 10
#define SIRFUART_TX_FIFO_HC_OFFSET 20
#define SIRFUART_TX_FIFO_CHK_SC(line, value) ((((line) == 1) ? (value & 0x3) :\
(value & 0x1f)) << SIRFUART_TX_FIFO_SC_OFFSET)
#define SIRFUART_TX_FIFO_CHK_LC(line, value) ((((line) == 1) ? (value & 0x3) :\
(value & 0x1f)) << SIRFUART_TX_FIFO_LC_OFFSET)
#define SIRFUART_TX_FIFO_CHK_HC(line, value) ((((line) == 1) ? (value & 0x3) :\
(value & 0x1f)) << SIRFUART_TX_FIFO_HC_OFFSET)
#define SIRFUART_RX_FIFO_CHK_SC SIRFUART_TX_FIFO_CHK_SC
#define SIRFUART_RX_FIFO_CHK_LC SIRFUART_TX_FIFO_CHK_LC
#define SIRFUART_RX_FIFO_CHK_HC SIRFUART_TX_FIFO_CHK_HC
/* Indicate how many buffers used */
#define SIRFSOC_RX_LOOP_BUF_CNT 2
/* Indicate if DMA channel valid */
#define IS_DMA_CHAN_VALID(x) ((x) != -1)
#define UNVALID_DMA_CHAN -1
/* For Fast Baud Rate Calculation */
struct sirfsoc_baudrate_to_regv {
unsigned int baud_rate;
unsigned int reg_val;
};
enum sirfsoc_tx_state {
TX_DMA_IDLE,
TX_DMA_RUNNING,
TX_DMA_PAUSE,
};
struct sirfsoc_loop_buffer {
struct circ_buf xmit;
dma_cookie_t cookie;
struct dma_async_tx_descriptor *desc;
dma_addr_t dma_addr;
};
struct sirfsoc_uart_port {
bool hw_flow_ctrl;
bool ms_enabled;
struct uart_port port;
struct clk *clk;
/* for SiRFmarco, there are SET/CLR for UART_INT_EN */
bool is_marco;
struct sirfsoc_uart_register *uart_reg;
int rx_dma_no;
int tx_dma_no;
struct dma_chan *rx_dma_chan;
struct dma_chan *tx_dma_chan;
dma_addr_t tx_dma_addr;
struct dma_async_tx_descriptor *tx_dma_desc;
spinlock_t rx_lock;
spinlock_t tx_lock;
struct tasklet_struct rx_dma_complete_tasklet;
struct tasklet_struct rx_tmo_process_tasklet;
unsigned int rx_io_count;
unsigned long transfer_size;
enum sirfsoc_tx_state tx_dma_state;
unsigned int cts_gpio;
unsigned int rts_gpio;
struct sirfsoc_loop_buffer rx_dma_items[SIRFSOC_RX_LOOP_BUF_CNT];
int rx_completed;
int rx_issued;
};
/* Hardware Flow Control */
#define SIRFUART_AFC_CTRL_RX_THD 0x70
/* Register Access Control */
#define portaddr(port, reg) ((port)->membase + (reg))
#define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
#define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
#define wr_regb(port, reg, val) __raw_writeb(val, portaddr(port, reg))
#define wr_regl(port, reg, val) __raw_writel(val, portaddr(port, reg))
/* UART Port Mask */
#define SIRFUART_FIFOLEVEL_MASK(port) ((port->line == 1) ? (0x1f) : (0x7f))
#define SIRFUART_FIFOFULL_MASK(port) ((port->line == 1) ? (0x20) : (0x80))
#define SIRFUART_FIFOEMPTY_MASK(port) ((port->line == 1) ? (0x40) : (0x100))
/* I/O Mode */
#define SIRFSOC_UART_IO_RX_MAX_CNT 256
#define SIRFSOC_UART_IO_TX_REASONABLE_CNT 6
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