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/*
* Freescale lpuart serial port driver
*
* Copyright 2012-2014 Freescale Semiconductor, Inc.
* Copyright 2017 NXP
*
* 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_FSL_LPUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/clk.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_dma.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/serial_core.h>
#include <linux/slab.h>
#include <linux/tty_flip.h>
/* All registers are 8-bit width */
#define UARTBDH 0x00
#define UARTBDL 0x01
#define UARTCR1 0x02
#define UARTCR2 0x03
#define UARTSR1 0x04
#define UARTCR3 0x06
#define UARTDR 0x07
#define UARTCR4 0x0a
#define UARTCR5 0x0b
#define UARTMODEM 0x0d
#define UARTPFIFO 0x10
#define UARTCFIFO 0x11
#define UARTSFIFO 0x12
#define UARTTWFIFO 0x13
#define UARTTCFIFO 0x14
#define UARTRWFIFO 0x15
#define UARTBDH_LBKDIE 0x80
#define UARTBDH_RXEDGIE 0x40
#define UARTBDH_SBR_MASK 0x1f
#define UARTCR1_LOOPS 0x80
#define UARTCR1_RSRC 0x20
#define UARTCR1_M 0x10
#define UARTCR1_WAKE 0x08
#define UARTCR1_ILT 0x04
#define UARTCR1_PE 0x02
#define UARTCR1_PT 0x01
#define UARTCR2_TIE 0x80
#define UARTCR2_TCIE 0x40
#define UARTCR2_RIE 0x20
#define UARTCR2_ILIE 0x10
#define UARTCR2_TE 0x08
#define UARTCR2_RE 0x04
#define UARTCR2_RWU 0x02
#define UARTCR2_SBK 0x01
#define UARTSR1_TDRE 0x80
#define UARTSR1_TC 0x40
#define UARTSR1_RDRF 0x20
#define UARTSR1_IDLE 0x10
#define UARTSR1_OR 0x08
#define UARTSR1_NF 0x04
#define UARTSR1_FE 0x02
#define UARTSR1_PE 0x01
#define UARTCR3_R8 0x80
#define UARTCR3_T8 0x40
#define UARTCR3_TXDIR 0x20
#define UARTCR3_TXINV 0x10
#define UARTCR3_ORIE 0x08
#define UARTCR3_NEIE 0x04
#define UARTCR3_FEIE 0x02
#define UARTCR3_PEIE 0x01
#define UARTCR4_MAEN1 0x80
#define UARTCR4_MAEN2 0x40
#define UARTCR4_M10 0x20
#define UARTCR4_BRFA_MASK 0x1f
#define UARTCR4_BRFA_OFF 0
#define UARTCR5_TDMAS 0x80
#define UARTCR5_RDMAS 0x20
#define UARTMODEM_RXRTSE 0x08
#define UARTMODEM_TXRTSPOL 0x04
#define UARTMODEM_TXRTSE 0x02
#define UARTMODEM_TXCTSE 0x01
#define UARTPFIFO_TXFE 0x80
#define UARTPFIFO_FIFOSIZE_MASK 0x7
#define UARTPFIFO_TXSIZE_OFF 4
#define UARTPFIFO_RXFE 0x08
#define UARTPFIFO_RXSIZE_OFF 0
#define UARTCFIFO_TXFLUSH 0x80
#define UARTCFIFO_RXFLUSH 0x40
#define UARTCFIFO_RXOFE 0x04
#define UARTCFIFO_TXOFE 0x02
#define UARTCFIFO_RXUFE 0x01
#define UARTSFIFO_TXEMPT 0x80
#define UARTSFIFO_RXEMPT 0x40
#define UARTSFIFO_RXOF 0x04
#define UARTSFIFO_TXOF 0x02
#define UARTSFIFO_RXUF 0x01
/* 32-bit register definition */
#define UARTBAUD 0x00
#define UARTSTAT 0x04
#define UARTCTRL 0x08
#define UARTDATA 0x0C
#define UARTMATCH 0x10
#define UARTMODIR 0x14
#define UARTFIFO 0x18
#define UARTWATER 0x1c
/* 32-bit global registers only for i.MX7ulp/MX8x
* The driver only use the reset feature to reset HW.
*/
#define UART_GLOBAL 0x8
#define UARTBAUD_MAEN1 0x80000000
#define UARTBAUD_MAEN2 0x40000000
#define UARTBAUD_M10 0x20000000
#define UARTBAUD_TDMAE 0x00800000
#define UARTBAUD_RDMAE 0x00200000
#define UARTBAUD_RIDMAE 0x00100000
#define UARTBAUD_MATCFG 0x00400000
#define UARTBAUD_BOTHEDGE 0x00020000
#define UARTBAUD_RESYNCDIS 0x00010000
#define UARTBAUD_LBKDIE 0x00008000
#define UARTBAUD_RXEDGIE 0x00004000
#define UARTBAUD_SBNS 0x00002000
#define UARTBAUD_SBR 0x00000000
#define UARTBAUD_SBR_MASK 0x1fff
#define UARTBAUD_OSR_MASK 0x1f
#define UARTBAUD_OSR_SHIFT 24
#define UARTSTAT_LBKDIF 0x80000000
#define UARTSTAT_RXEDGIF 0x40000000
#define UARTSTAT_MSBF 0x20000000
#define UARTSTAT_RXINV 0x10000000
#define UARTSTAT_RWUID 0x08000000
#define UARTSTAT_BRK13 0x04000000
#define UARTSTAT_LBKDE 0x02000000
#define UARTSTAT_RAF 0x01000000
#define UARTSTAT_TDRE 0x00800000
#define UARTSTAT_TC 0x00400000
#define UARTSTAT_RDRF 0x00200000
#define UARTSTAT_IDLE 0x00100000
#define UARTSTAT_OR 0x00080000
#define UARTSTAT_NF 0x00040000
#define UARTSTAT_FE 0x00020000
#define UARTSTAT_PE 0x00010000
#define UARTSTAT_MA1F 0x00008000
#define UARTSTAT_M21F 0x00004000
#define UARTCTRL_R8T9 0x80000000
#define UARTCTRL_R9T8 0x40000000
#define UARTCTRL_TXDIR 0x20000000
#define UARTCTRL_TXINV 0x10000000
#define UARTCTRL_ORIE 0x08000000
#define UARTCTRL_NEIE 0x04000000
#define UARTCTRL_FEIE 0x02000000
#define UARTCTRL_PEIE 0x01000000
#define UARTCTRL_TIE 0x00800000
#define UARTCTRL_TCIE 0x00400000
#define UARTCTRL_RIE 0x00200000
#define UARTCTRL_ILIE 0x00100000
#define UARTCTRL_TE 0x00080000
#define UARTCTRL_RE 0x00040000
#define UARTCTRL_RWU 0x00020000
#define UARTCTRL_SBK 0x00010000
#define UARTCTRL_MA1IE 0x00008000
#define UARTCTRL_MA2IE 0x00004000
#define UARTCTRL_IDLECFG_OFF 0x8
#define UARTCTRL_LOOPS 0x00000080
#define UARTCTRL_DOZEEN 0x00000040
#define UARTCTRL_RSRC 0x00000020
#define UARTCTRL_M 0x00000010
#define UARTCTRL_WAKE 0x00000008
#define UARTCTRL_ILT 0x00000004
#define UARTCTRL_PE 0x00000002
#define UARTCTRL_PT 0x00000001
#define UARTDATA_NOISY 0x00008000
#define UARTDATA_PARITYE 0x00004000
#define UARTDATA_FRETSC 0x00002000
#define UARTDATA_RXEMPT 0x00001000
#define UARTDATA_IDLINE 0x00000800
#define UARTDATA_INVALID 0x0000F000
#define UARTDATA_MASK 0x3ff
#define UARTMODIR_IREN 0x00020000
#define UARTMODIR_RTSWATER_S 0x8
#define UARTMODIR_RTSWATER_M 0x0000ff00
#define UARTMODIR_TXCTSSRC 0x00000020
#define UARTMODIR_TXCTSC 0x00000010
#define UARTMODIR_RXRTSE 0x00000008
#define UARTMODIR_TXRTSPOL 0x00000004
#define UARTMODIR_TXRTSE 0x00000002
#define UARTMODIR_TXCTSE 0x00000001
#define UARTFIFO_TXEMPT 0x00800000
#define UARTFIFO_RXEMPT 0x00400000
#define UARTFIFO_TXOF 0x00020000
#define UARTFIFO_RXUF 0x00010000
#define UARTFIFO_TXFLUSH 0x00008000
#define UARTFIFO_RXFLUSH 0x00004000
#define UARTFIFO_RXIDEN_MASK 0x7
#define UARTFIFO_RXIDEN_OFF 10
#define UARTFIFO_TXOFE 0x00000200
#define UARTFIFO_RXUFE 0x00000100
#define UARTFIFO_TXFE 0x00000080
#define UARTFIFO_FIFOSIZE_MASK 0x7
#define UARTFIFO_TXSIZE_OFF 4
#define UARTFIFO_RXFE 0x00000008
#define UARTFIFO_RXSIZE_OFF 0
#define UARTWATER_COUNT_MASK 0xff
#define UARTWATER_TXCNT_OFF 8
#define UARTWATER_RXCNT_OFF 24
#define UARTWATER_WATER_MASK 0xff
#define UARTWATER_TXWATER_OFF 0
#define UARTWATER_RXWATER_OFF 16
#define UART_GLOBAL_RST 0x2
#define RST_HW_MIN_US 20
#define RST_HW_MAX_US 40
#define UARTFIFO_RXIDEN_RDRF 0x3
#define UARTCTRL_IDLECFG 0x7
#define FSL_UART_RX_DMA_BUFFER_SIZE 128
#define UART_AUTOSUSPEND_TIMEOUT 3000
#define DRIVER_NAME "fsl-lpuart"
#define DEV_NAME "ttyLP"
#define UART_NR 6
/* IMX lpuart has four extra unused regs located at the beginning */
#define IMX_REG_OFF 0x10
struct lpuart_port {
struct uart_port port;
void __iomem *regbase;
struct clk *ipg_clk;
struct clk *per_clk;
unsigned int txfifo_size;
unsigned int rxfifo_size;
unsigned int txfifo_watermark;
unsigned int rxfifo_watermark;
unsigned int rts_watermark;
bool dma_eeop;
bool lpuart_dma_tx_use;
bool lpuart_dma_rx_use;
bool dma_rx_chan_active;
struct dma_chan *dma_tx_chan;
struct dma_chan *dma_rx_chan;
struct dma_async_tx_descriptor *dma_tx_desc;
struct dma_async_tx_descriptor *dma_rx_desc;
dma_addr_t dma_rx_buf_bus;
dma_cookie_t dma_tx_cookie;
dma_cookie_t dma_rx_cookie;
unsigned char *dma_rx_buf_virt;
unsigned int dma_tx_bytes;
unsigned int dma_rx_bytes;
size_t rxdma_len;
bool dma_tx_in_progress;
bool dma_rx_in_progress;
unsigned int dma_rx_timeout;
struct timer_list lpuart_timer;
struct scatterlist rx_sgl, tx_sgl[2];
unsigned int dma_tx_nents;
wait_queue_head_t dma_wait;
};
struct lpuart_soc_data {
char iotype;
u8 reg_off;
};
static const struct lpuart_soc_data vf_data = {
.iotype = UPIO_MEM,
};
static const struct lpuart_soc_data ls_data = {
.iotype = UPIO_MEM32BE,
};
static struct lpuart_soc_data imx_data = {
.iotype = UPIO_MEM32,
.reg_off = IMX_REG_OFF,
};
static const struct of_device_id lpuart_dt_ids[] = {
{ .compatible = "fsl,vf610-lpuart", .data = &vf_data, },
{ .compatible = "fsl,ls1021a-lpuart", .data = &ls_data, },
{ .compatible = "fsl,imx7ulp-lpuart", .data = &imx_data, },
{ .compatible = "fsl,imx8qm-lpuart", .data = &imx_data, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
static bool lpuart_is_32(struct lpuart_port *sport)
{
return sport->port.iotype == UPIO_MEM32 ||
sport->port.iotype == UPIO_MEM32BE;
}
/* Forward declare this for the dma callbacks*/
static int lpuart_dma_rx(struct lpuart_port *sport);
static void lpuart_dma_tx_complete(void *arg);
static inline void lpuart_prepare_rx(struct lpuart_port *sport);
static inline u32 lpuart32_read(struct uart_port *port, u32 off)
{
switch (port->iotype) {
case UPIO_MEM32:
return readl(port->membase + off);
case UPIO_MEM32BE:
return ioread32be(port->membase + off);
default:
return 0;
}
}
static inline void lpuart32_write(struct uart_port *port, u32 val,
u32 off)
{
switch (port->iotype) {
case UPIO_MEM32:
writel(val, port->membase + off);
break;
case UPIO_MEM32BE:
iowrite32be(val, port->membase + off);
break;
}
}
static int lpuart_hw_reset(struct lpuart_port *sport)
{
struct uart_port *port = &sport->port;
struct device_node *np = sport->port.dev->of_node;
int ret;
if (uart_console(port))
return 0;
ret = clk_prepare_enable(sport->ipg_clk);
if (ret) {
dev_err(sport->port.dev, "failed to enable uart ipg clk: %d\n", ret);
return ret;
}
if (np && (of_device_is_compatible(np, "fsl,imx7ulp-lpuart") ||
of_device_is_compatible(np, "fsl,imx8qm-lpuart"))) {
writel(UART_GLOBAL_RST, sport->regbase + UART_GLOBAL);
usleep_range(RST_HW_MIN_US, RST_HW_MAX_US);
writel(0, sport->regbase + UART_GLOBAL);
usleep_range(RST_HW_MIN_US, RST_HW_MAX_US);
}
clk_disable_unprepare(sport->ipg_clk);
return 0;
}
static void lpuart_stop_tx(struct uart_port *port)
{
unsigned char temp;
temp = readb(port->membase + UARTCR2);
temp &= ~(UARTCR2_TIE | UARTCR2_TCIE);
writeb(temp, port->membase + UARTCR2);
}
static void lpuart32_stop_tx(struct uart_port *port)
{
unsigned long temp;
temp = lpuart32_read(port, UARTCTRL);
temp &= ~(UARTCTRL_TIE | UARTCTRL_TCIE);
lpuart32_write(port, temp, UARTCTRL);
}
static void lpuart_stop_rx(struct uart_port *port)
{
unsigned char temp;
temp = readb(port->membase + UARTCR2);
writeb(temp & ~UARTCR2_RE, port->membase + UARTCR2);
}
static void lpuart32_stop_rx(struct uart_port *port)
{
unsigned long temp;
temp = lpuart32_read(port, UARTCTRL);
lpuart32_write(port, temp & ~UARTCTRL_RE, UARTCTRL);
}
static void lpuart_recal_min_trans_size(struct lpuart_port *sport)
{
struct circ_buf *xmit = &sport->port.state->xmit;
u32 txcount, rxcount;
sport->dma_tx_bytes = uart_circ_chars_pending(xmit);
/* lpuart32 and loopback mode re-calculate the trans size */
if (!lpuart_is_32(sport) || !(sport->port.mctrl & TIOCM_LOOP))
return;
txcount = lpuart32_read(&sport->port, UARTWATER);
txcount = txcount >> UARTWATER_TXCNT_OFF;
txcount &= UARTWATER_COUNT_MASK;
rxcount = lpuart32_read(&sport->port, UARTWATER);
rxcount = rxcount >> UARTWATER_RXCNT_OFF;
txcount = min_t(unsigned int, sport->txfifo_size - txcount,
sport->rxfifo_size - rxcount);
sport->dma_tx_bytes = min_t(unsigned int, txcount, sport->dma_tx_bytes);
}
static void lpuart_dma_tx(struct lpuart_port *sport)
{
struct circ_buf *xmit = &sport->port.state->xmit;
struct scatterlist *sgl = sport->tx_sgl;
struct device *dev = sport->port.dev;
u32 toend_cnt;
int ret;
if (sport->dma_tx_in_progress)
return;
lpuart_recal_min_trans_size(sport);
if (!sport->dma_tx_bytes)
return;
toend_cnt = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
if (xmit->tail < xmit->head || xmit->head == 0 ||
(sport->port.mctrl & TIOCM_LOOP && sport->dma_tx_bytes <= toend_cnt)) {
sport->dma_tx_nents = 1;
sg_init_one(sgl, xmit->buf + xmit->tail, sport->dma_tx_bytes);
} else {
sport->dma_tx_nents = 2;
sg_init_table(sgl, 2);
sg_set_buf(sgl, xmit->buf + xmit->tail,
UART_XMIT_SIZE - xmit->tail);
sg_set_buf(sgl + 1, xmit->buf, sport->dma_tx_bytes -
(UART_XMIT_SIZE - xmit->tail));
}
ret = dma_map_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
if (!ret) {
dev_err(dev, "DMA mapping error for TX.\n");
return;
}
sport->dma_tx_desc = dmaengine_prep_slave_sg(sport->dma_tx_chan, sgl,
ret, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT);
if (!sport->dma_tx_desc) {
dma_unmap_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
dev_err(dev, "Cannot prepare TX slave DMA!\n");
return;
}
sport->dma_tx_desc->callback = lpuart_dma_tx_complete;
sport->dma_tx_desc->callback_param = sport;
sport->dma_tx_in_progress = true;
sport->dma_tx_cookie = dmaengine_submit(sport->dma_tx_desc);
dma_async_issue_pending(sport->dma_tx_chan);
}
static void lpuart_dma_tx_complete(void *arg)
{
struct lpuart_port *sport = arg;
struct scatterlist *sgl = &sport->tx_sgl[0];
struct circ_buf *xmit = &sport->port.state->xmit;
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
if (!sport->dma_tx_in_progress) {
spin_unlock_irqrestore(&sport->port.lock, flags);
return;
}
dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
xmit->tail = (xmit->tail + sport->dma_tx_bytes) & (UART_XMIT_SIZE - 1);
sport->port.icount.tx += sport->dma_tx_bytes;
sport->dma_tx_in_progress = false;
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
if (waitqueue_active(&sport->dma_wait)) {
wake_up(&sport->dma_wait);
spin_unlock_irqrestore(&sport->port.lock, flags);
return;
}
if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port))
lpuart_dma_tx(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static int lpuart_dma_tx_request(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port,
struct lpuart_port, port);
struct dma_slave_config dma_tx_sconfig = {};
int ret;
if (lpuart_is_32(sport))
dma_tx_sconfig.dst_addr = sport->port.mapbase + UARTDATA;
else
dma_tx_sconfig.dst_addr = sport->port.mapbase + UARTDR;
dma_tx_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
dma_tx_sconfig.dst_maxburst = 1;
dma_tx_sconfig.direction = DMA_MEM_TO_DEV;
ret = dmaengine_slave_config(sport->dma_tx_chan, &dma_tx_sconfig);
if (ret < 0) {
dev_err(sport->port.dev,
"Dma slave config failed, err = %d\n", ret);
return ret;
}
return 0;
}
static void lpuart_flush_buffer(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
u32 val;
if (sport->lpuart_dma_tx_use) {
if (sport->dma_tx_in_progress) {
dma_unmap_sg(sport->port.dev, &sport->tx_sgl[0],
sport->dma_tx_nents, DMA_TO_DEVICE);
sport->dma_tx_in_progress = false;
}
dmaengine_terminate_all(sport->dma_tx_chan);
}
if (lpuart_is_32(sport)) {
val = lpuart32_read(&sport->port, UARTFIFO);
val |= UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH;
lpuart32_write(&sport->port, val, UARTFIFO);
} else {
val = readb(sport->port.membase + UARTPFIFO);
val |= UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH;
writeb(val, sport->port.membase + UARTCFIFO);
}
}
#if defined(CONFIG_CONSOLE_POLL)
static int lpuart_poll_init(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port,
struct lpuart_port, port);
unsigned long flags;
unsigned char temp;
sport->port.fifosize = 0;
spin_lock_irqsave(&sport->port.lock, flags);
/* Disable Rx & Tx */
writeb(0, sport->port.membase + UARTCR2);
temp = readb(sport->port.membase + UARTPFIFO);
/* Enable Rx and Tx FIFO */
writeb(temp | UARTPFIFO_RXFE | UARTPFIFO_TXFE,
sport->port.membase + UARTPFIFO);
/* flush Tx and Rx FIFO */
writeb(UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH,
sport->port.membase + UARTCFIFO);
/* explicitly clear RDRF */
if (readb(sport->port.membase + UARTSR1) & UARTSR1_RDRF) {
readb(sport->port.membase + UARTDR);
writeb(UARTSFIFO_RXUF, sport->port.membase + UARTSFIFO);
}
writeb(0, sport->port.membase + UARTTWFIFO);
writeb(1, sport->port.membase + UARTRWFIFO);
/* Enable Rx and Tx */
writeb(UARTCR2_RE | UARTCR2_TE, sport->port.membase + UARTCR2);
spin_unlock_irqrestore(&sport->port.lock, flags);
return 0;
}
static void lpuart_poll_put_char(struct uart_port *port, unsigned char c)
{
/* drain */
while (!(readb(port->membase + UARTSR1) & UARTSR1_TDRE))
barrier();
writeb(c, port->membase + UARTDR);
}
static int lpuart_poll_get_char(struct uart_port *port)
{
if (!(readb(port->membase + UARTSR1) & UARTSR1_RDRF))
return NO_POLL_CHAR;
return readb(port->membase + UARTDR);
}
static int lpuart32_poll_init(struct uart_port *port)
{
unsigned long flags;
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
u32 temp;
sport->port.fifosize = 0;
spin_lock_irqsave(&sport->port.lock, flags);
/* Disable Rx & Tx */
writel(0, sport->port.membase + UARTCTRL);
temp = readl(sport->port.membase + UARTFIFO);
/* Enable Rx and Tx FIFO */
writel(temp | UARTFIFO_RXFE | UARTFIFO_TXFE,
sport->port.membase + UARTFIFO);
/* flush Tx and Rx FIFO */
writel(UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH,
sport->port.membase + UARTFIFO);
/* explicitly clear RDRF */
if (readl(sport->port.membase + UARTSTAT) & UARTSTAT_RDRF) {
readl(sport->port.membase + UARTDATA);
writel(UARTFIFO_RXUF, sport->port.membase + UARTFIFO);
}
/* Enable Rx and Tx */
writel(UARTCTRL_RE | UARTCTRL_TE, sport->port.membase + UARTCTRL);
spin_unlock_irqrestore(&sport->port.lock, flags);
return 0;
}
static void lpuart32_poll_put_char(struct uart_port *port, unsigned char c)
{
while (!(readl(port->membase + UARTSTAT) & UARTSTAT_TDRE))
barrier();
writel(c, port->membase + UARTDATA);
}
static int lpuart32_poll_get_char(struct uart_port *port)
{
if (!(readl(port->membase + UARTSTAT) & UARTSTAT_RDRF))
return NO_POLL_CHAR;
return readl(port->membase + UARTDATA);
}
#endif
static inline void lpuart_transmit_buffer(struct lpuart_port *sport)
{
struct circ_buf *xmit = &sport->port.state->xmit;
while (!uart_circ_empty(xmit) &&
(readb(sport->port.membase + UARTTCFIFO) < sport->txfifo_size)) {
writeb(xmit->buf[xmit->tail], sport->port.membase + UARTDR);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
sport->port.icount.tx++;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
if (uart_circ_empty(xmit))
lpuart_stop_tx(&sport->port);
}
static inline void lpuart32_transmit_buffer(struct lpuart_port *sport)
{
struct circ_buf *xmit = &sport->port.state->xmit;
unsigned long txcnt;
txcnt = lpuart32_read(&sport->port, UARTWATER);
txcnt = txcnt >> UARTWATER_TXCNT_OFF;
txcnt &= UARTWATER_COUNT_MASK;
while (!uart_circ_empty(xmit) && (txcnt < sport->txfifo_size)) {
lpuart32_write(&sport->port, xmit->buf[xmit->tail], UARTDATA);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
sport->port.icount.tx++;
txcnt = lpuart32_read(&sport->port, UARTWATER);
txcnt = txcnt >> UARTWATER_TXCNT_OFF;
txcnt &= UARTWATER_COUNT_MASK;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
if (uart_circ_empty(xmit))
lpuart32_stop_tx(&sport->port);
}
static void lpuart_start_tx(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port,
struct lpuart_port, port);
struct circ_buf *xmit = &sport->port.state->xmit;
unsigned char temp;
if (sport->lpuart_dma_tx_use) {
if (!uart_circ_empty(xmit) && !uart_tx_stopped(port))
lpuart_dma_tx(sport);
} else {
temp = readb(port->membase + UARTCR2);
writeb(temp | UARTCR2_TIE, port->membase + UARTCR2);
if (readb(port->membase + UARTSR1) & UARTSR1_TDRE)
lpuart_transmit_buffer(sport);
}
}
static void lpuart32_start_tx(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
struct circ_buf *xmit = &sport->port.state->xmit;
unsigned long temp;
if (sport->lpuart_dma_tx_use) {
if (!uart_circ_empty(xmit) && !uart_tx_stopped(port))
lpuart_dma_tx(sport);
} else {
temp = lpuart32_read(port, UARTCTRL);
lpuart32_write(port, temp | UARTCTRL_TIE, UARTCTRL);
if (lpuart32_read(&sport->port, UARTSTAT) & UARTSTAT_TDRE)
lpuart32_transmit_buffer(sport);
}
}
static void
lpuart_uart_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
{
switch (state) {
case UART_PM_STATE_OFF:
pm_runtime_mark_last_busy(port->dev);
pm_runtime_put_autosuspend(port->dev);
break;
default:
pm_runtime_get_sync(port->dev);
break;
}
}
/* return TIOCSER_TEMT when transmitter is not busy */
static unsigned int lpuart_tx_empty(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port,
struct lpuart_port, port);
unsigned char sr1 = readb(port->membase + UARTSR1);
unsigned char sfifo = readb(port->membase + UARTSFIFO);
if (sport->dma_tx_in_progress)
return 0;
if (sr1 & UARTSR1_TC && sfifo & UARTSFIFO_TXEMPT)
return TIOCSER_TEMT;
return 0;
}
static unsigned int lpuart32_tx_empty(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port,
struct lpuart_port, port);
unsigned int sr1 = lpuart32_read(port, UARTSTAT);
unsigned int sfifo = lpuart32_read(port, UARTFIFO);
if (sport->dma_tx_in_progress)
return 0;
if (sr1 & UARTSTAT_TC && sfifo & UARTFIFO_TXEMPT)
return TIOCSER_TEMT;
return 0;
}
static irqreturn_t lpuart_txint(int irq, void *dev_id)
{
struct lpuart_port *sport = dev_id;
struct circ_buf *xmit = &sport->port.state->xmit;
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
if (sport->port.x_char) {
if (lpuart_is_32(sport))
lpuart32_write(&sport->port, sport->port.x_char, UARTDATA);
else
writeb(sport->port.x_char, sport->port.membase + UARTDR);
goto out;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
if (lpuart_is_32(sport))
lpuart32_stop_tx(&sport->port);
else
lpuart_stop_tx(&sport->port);
goto out;
}
if (lpuart_is_32(sport))
lpuart32_transmit_buffer(sport);
else
lpuart_transmit_buffer(sport);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
out:
spin_unlock_irqrestore(&sport->port.lock, flags);
return IRQ_HANDLED;
}
static irqreturn_t lpuart_rxint(int irq, void *dev_id)
{
struct lpuart_port *sport = dev_id;
unsigned int flg, ignored = 0;
struct tty_port *port = &sport->port.state->port;
unsigned long flags;
unsigned char rx, sr;
spin_lock_irqsave(&sport->port.lock, flags);
while (!(readb(sport->port.membase + UARTSFIFO) & UARTSFIFO_RXEMPT)) {
flg = TTY_NORMAL;
sport->port.icount.rx++;
/*
* to clear the FE, OR, NF, FE, PE flags,
* read SR1 then read DR
*/
sr = readb(sport->port.membase + UARTSR1);
rx = readb(sport->port.membase + UARTDR);
if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
continue;
if (sr & (UARTSR1_PE | UARTSR1_OR | UARTSR1_FE)) {
if (sr & UARTSR1_PE)
sport->port.icount.parity++;
else if (sr & UARTSR1_FE)
sport->port.icount.frame++;
if (sr & UARTSR1_OR)
sport->port.icount.overrun++;
if (sr & sport->port.ignore_status_mask) {
if (++ignored > 100)
goto out;
continue;
}
sr &= sport->port.read_status_mask;
if (sr & UARTSR1_PE)
flg = TTY_PARITY;
else if (sr & UARTSR1_FE)
flg = TTY_FRAME;
if (sr & UARTSR1_OR)
flg = TTY_OVERRUN;
#ifdef SUPPORT_SYSRQ
sport->port.sysrq = 0;
#endif
}
tty_insert_flip_char(port, rx, flg);
}
out:
spin_unlock_irqrestore(&sport->port.lock, flags);
tty_flip_buffer_push(port);
return IRQ_HANDLED;
}
static irqreturn_t lpuart32_rxint(int irq, void *dev_id)
{
struct lpuart_port *sport = dev_id;
unsigned int flg, ignored = 0;
struct tty_port *port = &sport->port.state->port;
unsigned long flags;
unsigned long rx, sr;
spin_lock_irqsave(&sport->port.lock, flags);
while (!(lpuart32_read(&sport->port, UARTFIFO) & UARTFIFO_RXEMPT)) {
flg = TTY_NORMAL;
sport->port.icount.rx++;
/*
* to clear the FE, OR, NF, FE, PE flags,
* read STAT then read DATA reg
*/
sr = lpuart32_read(&sport->port, UARTSTAT);
rx = lpuart32_read(&sport->port, UARTDATA);
if ((sr & UARTSTAT_FE) && (rx & UARTDATA_FRETSC) &&
!(rx & UARTDATA_MASK)) {
if (uart_handle_break(&sport->port))
continue;
}
if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
continue;
if (sr & (UARTSTAT_PE | UARTSTAT_OR | UARTSTAT_FE)) {
if (sr & UARTSTAT_PE)
sport->port.icount.parity++;
else if (sr & UARTSTAT_FE)
sport->port.icount.frame++;
if (sr & UARTSTAT_OR)
sport->port.icount.overrun++;
if (sr & sport->port.ignore_status_mask) {
if (++ignored > 100)
goto out;
continue;
}
sr &= sport->port.read_status_mask;
if (sr & UARTSTAT_PE)
flg = TTY_PARITY;
else if (sr & UARTSTAT_FE)
flg = TTY_FRAME;
if (sr & UARTSTAT_OR)
flg = TTY_OVERRUN;
#ifdef SUPPORT_SYSRQ
sport->port.sysrq = 0;
#endif
continue;
}
if (rx & UARTDATA_INVALID)
continue;
rx &= UARTDATA_MASK;
tty_insert_flip_char(port, rx, flg);
}
out:
spin_unlock_irqrestore(&sport->port.lock, flags);
tty_flip_buffer_push(port);
return IRQ_HANDLED;
}
static irqreturn_t lpuart_int(int irq, void *dev_id)
{
struct lpuart_port *sport = dev_id;
unsigned char sts, crdma;
sts = readb(sport->port.membase + UARTSR1);
crdma = readb(sport->port.membase + UARTCR5);
if (sts & UARTSR1_RDRF && !(crdma & UARTCR5_RDMAS)) {
if (sport->lpuart_dma_rx_use)
lpuart_prepare_rx(sport);
else
lpuart_rxint(irq, dev_id);
}
if (sts & UARTSR1_TDRE && !sport->lpuart_dma_tx_use)
lpuart_txint(irq, dev_id);
return IRQ_HANDLED;
}
static irqreturn_t lpuart32_int(int irq, void *dev_id)
{
struct lpuart_port *sport = dev_id;
unsigned long sts, rxcount, crdma;
sts = lpuart32_read(&sport->port, UARTSTAT);
rxcount = lpuart32_read(&sport->port, UARTWATER);
rxcount = rxcount >> UARTWATER_RXCNT_OFF;
crdma = lpuart32_read(&sport->port, UARTBAUD);
if (!sts)
return IRQ_NONE;
if (!(crdma & UARTBAUD_RDMAE) && rxcount > 0) {
if (!sport->lpuart_dma_rx_use ||
(sts & (UARTSTAT_PE | UARTSTAT_NF | UARTSTAT_FE)))
lpuart32_rxint(irq, dev_id);
else if (sport->lpuart_dma_rx_use && sport->dma_rx_chan_active)
lpuart_prepare_rx(sport);
} else if (!(crdma & UARTBAUD_RDMAE) && (sts & UARTSTAT_IDLE) &&
!(sport->lpuart_dma_rx_use && sport->dma_eeop &&
rxcount > 0)) {
lpuart32_write(&sport->port, UARTSTAT_IDLE, UARTSTAT);
}
if (sts & UARTSTAT_TDRE && !sport->lpuart_dma_tx_use)
lpuart_txint(irq, dev_id);
sts &= ~UARTSTAT_IDLE;
lpuart32_write(&sport->port, sts, UARTSTAT);
return IRQ_HANDLED;
}
static void lpuart_copy_rx_to_tty(struct lpuart_port *sport,
struct tty_port *tty, int count)
{
int copied;
sport->port.icount.rx += count;
if (!tty) {
dev_err(sport->port.dev, "No tty port\n");
return;
}
dma_sync_single_for_cpu(sport->port.dev, sport->dma_rx_buf_bus,
sport->rxdma_len, DMA_FROM_DEVICE);
copied = tty_insert_flip_string(tty,
((unsigned char *)(sport->dma_rx_buf_virt)), count);
if (copied != count)
sport->port.icount.buf_overrun += count - copied;
sport->port.icount.rx += copied;
}
static void lpuart_dma_stop(struct lpuart_port *sport, bool enable_pio)
{
unsigned int temp;
unsigned int crdma;
if (lpuart_is_32(sport)) {
lpuart32_write(&sport->port, UARTSTAT_IDLE, UARTSTAT);
crdma = lpuart32_read(&sport->port, UARTBAUD);
lpuart32_write(&sport->port, crdma & ~(UARTBAUD_RDMAE | UARTBAUD_RIDMAE),
UARTBAUD);
if (enable_pio) {
temp = lpuart32_read(&sport->port, UARTCTRL);
temp |= (UARTCTRL_RIE | UARTCTRL_ILIE);
lpuart32_write(&sport->port, temp, UARTCTRL);
}
} else {
temp = readb(sport->port.membase + UARTCR5);
writeb(temp & ~UARTCR5_RDMAS, sport->port.membase + UARTCR5);
}
}
static void lpuart_dma_rx_complete(void *arg)
{
struct lpuart_port *sport = arg;
struct tty_port *port = &sport->port.state->port;
unsigned long flags;
struct dma_tx_state state;
int count, rxcount;
if (!sport->dma_eeop)
mod_timer(&sport->lpuart_timer,
jiffies + sport->dma_rx_timeout);
spin_lock_irqsave(&sport->port.lock, flags);
sport->dma_rx_in_progress = false;
dmaengine_tx_status(sport->dma_rx_chan, sport->dma_rx_cookie, &state);
count = sport->rxdma_len - state.residue;
spin_unlock_irqrestore(&sport->port.lock, flags);
lpuart_copy_rx_to_tty(sport, port, count);
tty_flip_buffer_push(port);
spin_lock_irqsave(&sport->port.lock, flags);
/* For end of packet, clear the idle flag to avoid to trigger
* the next transfer. Only i.MX8x lpuart support EEOP.
*/
if (sport->dma_eeop && lpuart_is_32(sport)) {
rxcount = lpuart32_read(&sport->port, UARTWATER);
rxcount = rxcount >> UARTWATER_RXCNT_OFF;
if (!rxcount)
lpuart32_write(&sport->port, UARTSTAT_IDLE, UARTSTAT);
}
if (!sport->dma_eeop && count < sport->rxfifo_watermark)
lpuart_dma_stop(sport, true);
else
lpuart_dma_rx(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static void lpuart_timer_func(unsigned long data)
{
struct lpuart_port *sport = (struct lpuart_port *)data;
struct tty_port *port = &sport->port.state->port;
struct dma_tx_state state;
unsigned long flags;
int count;
del_timer(&sport->lpuart_timer);
dmaengine_pause(sport->dma_rx_chan);
dmaengine_tx_status(sport->dma_rx_chan, sport->dma_rx_cookie, &state);
dmaengine_terminate_all(sport->dma_rx_chan);
count = sport->rxdma_len - state.residue;
spin_lock_irqsave(&sport->port.lock, flags);
sport->dma_rx_in_progress = false;
lpuart_copy_rx_to_tty(sport, port, count);
tty_flip_buffer_push(port);
lpuart_dma_stop(sport, true);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static int lpuart_dma_rx(struct lpuart_port *sport)
{
dma_sync_single_for_device(sport->port.dev, sport->dma_rx_buf_bus,
sport->rxdma_len, DMA_FROM_DEVICE);
sport->dma_rx_desc = dmaengine_prep_slave_single(sport->dma_rx_chan,
sport->dma_rx_buf_bus, sport->rxdma_len,
DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
if (!sport->dma_rx_desc) {
dev_err(sport->port.dev, "Not able to get desc for rx\n");
return -EIO;
}
sport->dma_rx_desc->callback = lpuart_dma_rx_complete;
sport->dma_rx_desc->callback_param = sport;
sport->dma_rx_in_progress = true;
sport->dma_rx_cookie = dmaengine_submit(sport->dma_rx_desc);
dma_async_issue_pending(sport->dma_rx_chan);
return 0;
}
static void lpuart_dma_rx_free(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port,
struct lpuart_port, port);
sport->dma_rx_chan_active = false;
dma_unmap_single(sport->port.dev, sport->dma_rx_buf_bus,
sport->rxdma_len, DMA_FROM_DEVICE);
devm_kfree(sport->port.dev, sport->dma_rx_buf_virt);
sport->dma_rx_buf_bus = 0;
sport->dma_rx_buf_virt = NULL;
}
static inline void lpuart_prepare_rx(struct lpuart_port *sport)
{
unsigned long flags;
unsigned int temp;
unsigned int crdma;
spin_lock_irqsave(&sport->port.lock, flags);
if (!sport->dma_eeop) {
sport->lpuart_timer.expires = jiffies + sport->dma_rx_timeout;
add_timer(&sport->lpuart_timer);
}
lpuart_dma_rx(sport);
if (lpuart_is_32(sport)) {
temp = lpuart32_read(&sport->port, UARTCTRL);
temp &= ~(UARTCTRL_RIE | UARTCTRL_ILIE);
lpuart32_write(&sport->port, temp, UARTCTRL);
crdma = lpuart32_read(&sport->port, UARTBAUD);
if (sport->dma_eeop)
crdma |= UARTBAUD_RIDMAE;
lpuart32_write(&sport->port, crdma | UARTBAUD_RDMAE, UARTBAUD);
} else {
temp = readb(sport->port.membase + UARTCR5);
writeb(temp | UARTCR5_RDMAS, sport->port.membase + UARTCR5);
}
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static int lpuart_config_rs485(struct uart_port *port,
struct serial_rs485 *rs485)
{
struct lpuart_port *sport = container_of(port,
struct lpuart_port, port);
u8 modem = readb(sport->port.membase + UARTMODEM) &
~(UARTMODEM_TXRTSPOL | UARTMODEM_TXRTSE);
writeb(modem, sport->port.membase + UARTMODEM);
/* clear unsupported configurations */
rs485->delay_rts_before_send = 0;
rs485->delay_rts_after_send = 0;
rs485->flags &= ~SER_RS485_RX_DURING_TX;
if (rs485->flags & SER_RS485_ENABLED) {
/* Enable auto RS-485 RTS mode */
modem |= UARTMODEM_TXRTSE;
/*
* RTS needs to be logic HIGH either during transer _or_ after
* transfer, other variants are not supported by the hardware.
*/
if (!(rs485->flags & (SER_RS485_RTS_ON_SEND |
SER_RS485_RTS_AFTER_SEND)))
rs485->flags |= SER_RS485_RTS_ON_SEND;
if (rs485->flags & SER_RS485_RTS_ON_SEND &&
rs485->flags & SER_RS485_RTS_AFTER_SEND)
rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
/*
* The hardware defaults to RTS logic HIGH while transfer.
* Switch polarity in case RTS shall be logic HIGH
* after transfer.
* Note: UART is assumed to be active high.
*/
if (rs485->flags & SER_RS485_RTS_ON_SEND)
modem &= ~UARTMODEM_TXRTSPOL;
else if (rs485->flags & SER_RS485_RTS_AFTER_SEND)
modem |= UARTMODEM_TXRTSPOL;
}
/* Store the new configuration */
sport->port.rs485 = *rs485;
writeb(modem, sport->port.membase + UARTMODEM);
return 0;
}
static unsigned int lpuart_get_mctrl(struct uart_port *port)
{
unsigned int temp = 0;
unsigned char reg;
reg = readb(port->membase + UARTMODEM);
if (reg & UARTMODEM_TXCTSE)
temp |= TIOCM_CTS;
if (reg & UARTMODEM_RXRTSE)
temp |= TIOCM_RTS;
return temp;
}
static unsigned int lpuart32_get_mctrl(struct uart_port *port)
{
unsigned int temp = 0;
unsigned long reg;
reg = lpuart32_read(port, UARTMODIR);
if (reg & UARTMODIR_TXCTSE)
temp |= TIOCM_CTS;
if (reg & UARTMODIR_RXRTSE)
temp |= TIOCM_RTS;
if (lpuart32_read(port, UARTCTRL) & UARTCTRL_LOOPS)
temp |= TIOCM_LOOP;
return temp;
}
static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
/* No flow control for user handle */
unsigned char temp;
struct lpuart_port *sport = container_of(port,
struct lpuart_port, port);
/* Make sure RXRTSE bit is not set when RS485 is enabled */
if (!(sport->port.rs485.flags & SER_RS485_ENABLED)) {
temp = readb(sport->port.membase + UARTMODEM) &
~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
if (mctrl & TIOCM_RTS)
temp |= UARTMODEM_RXRTSE;
if (mctrl & TIOCM_CTS)
temp |= UARTMODEM_TXCTSE;
writeb(temp, port->membase + UARTMODEM);
}
}
static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
unsigned long temp;
temp = lpuart32_read(port, UARTCTRL);
if (mctrl & TIOCM_LOOP)
temp |= UARTCTRL_LOOPS;
else
temp &= ~UARTCTRL_LOOPS;
lpuart32_write(port, temp, UARTCTRL);
}
static void lpuart_break_ctl(struct uart_port *port, int break_state)
{
unsigned char temp;
temp = readb(port->membase + UARTCR2) & ~UARTCR2_SBK;
if (break_state != 0)
temp |= UARTCR2_SBK;
writeb(temp, port->membase + UARTCR2);
}
static void lpuart32_break_ctl(struct uart_port *port, int break_state)
{
unsigned long temp;
temp = lpuart32_read(port, UARTCTRL) & ~UARTCTRL_SBK;
if (break_state != 0)
temp |= UARTCTRL_SBK;
lpuart32_write(port, temp, UARTCTRL);
}
static void lpuart_setup_watermark(struct lpuart_port *sport)
{
unsigned char val, cr2;
unsigned char cr2_saved;
cr2 = readb(sport->port.membase + UARTCR2);
cr2_saved = cr2;
cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_TE |
UARTCR2_RIE | UARTCR2_RE);
writeb(cr2, sport->port.membase + UARTCR2);
val = readb(sport->port.membase + UARTPFIFO);
writeb(val | UARTPFIFO_TXFE | UARTPFIFO_RXFE,
sport->port.membase + UARTPFIFO);
/* flush Tx and Rx FIFO */
writeb(UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH,
sport->port.membase + UARTCFIFO);
/* explicitly clear RDRF */
if (readb(sport->port.membase + UARTSR1) & UARTSR1_RDRF) {
readb(sport->port.membase + UARTDR);
writeb(UARTSFIFO_RXUF, sport->port.membase + UARTSFIFO);
}
writeb(0, sport->port.membase + UARTTWFIFO);
writeb(1, sport->port.membase + UARTRWFIFO);
/* Restore cr2 */
writeb(cr2_saved, sport->port.membase + UARTCR2);
}
static void lpuart32_setup_watermark(struct lpuart_port *sport)
{
unsigned long val, ctrl;
unsigned long ctrl_saved;
unsigned long rxiden_cnt = UARTFIFO_RXIDEN_RDRF;
ctrl = lpuart32_read(&sport->port, UARTCTRL);
ctrl_saved = ctrl;
ctrl &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_TE |
UARTCTRL_RIE | UARTCTRL_RE);
lpuart32_write(&sport->port, ctrl, UARTCTRL);
/* enable FIFO mode */
val = lpuart32_read(&sport->port, UARTFIFO);
val |= UARTFIFO_TXFE | UARTFIFO_RXFE;
val |= UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH;
val &= ~(UARTFIFO_RXIDEN_MASK << UARTFIFO_RXIDEN_OFF);
if (sport->dma_eeop)
rxiden_cnt = 0;
val |= ((rxiden_cnt & UARTFIFO_RXIDEN_MASK) <<
UARTFIFO_RXIDEN_OFF);
lpuart32_write(&sport->port, val, UARTFIFO);
/* set the watermark */
if (uart_console(&sport->port)) {
val = (0x1 << UARTWATER_RXWATER_OFF) |
(0x0 << UARTWATER_TXWATER_OFF);
} else {
val = lpuart32_read(&sport->port, UARTMODIR);
val = sport->rts_watermark << UARTMODIR_RTSWATER_S;
lpuart32_write(&sport->port, val, UARTMODIR);
val = (sport->rxfifo_watermark << UARTWATER_RXWATER_OFF) |
(sport->txfifo_watermark << UARTWATER_TXWATER_OFF);
}
lpuart32_write(&sport->port, val, UARTWATER);
/* Restore cr2 */
lpuart32_write(&sport->port, ctrl_saved, UARTCTRL);
}
static int lpuart_dma_rx_request(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port,
struct lpuart_port, port);
struct dma_slave_config dma_rx_sconfig;
dma_addr_t dma_bus;
unsigned char *dma_buf;
int ret;
dma_buf = devm_kzalloc(sport->port.dev,
sport->rxdma_len, GFP_KERNEL);
if (!dma_buf) {
dev_err(sport->port.dev, "Dma rx alloc failed\n");
return -ENOMEM;
}
dma_bus = dma_map_single(sport->port.dev, dma_buf,
sport->rxdma_len, DMA_FROM_DEVICE);
if (dma_mapping_error(sport->port.dev, dma_bus)) {
dev_err(sport->port.dev, "dma_map_single rx failed\n");
return -ENOMEM;
}
if (lpuart_is_32(sport))
dma_rx_sconfig.src_addr = sport->port.mapbase + UARTDATA;
else
dma_rx_sconfig.src_addr = sport->port.mapbase + UARTDR;
dma_rx_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
dma_rx_sconfig.src_maxburst = 1;
dma_rx_sconfig.direction = DMA_DEV_TO_MEM;
ret = dmaengine_slave_config(sport->dma_rx_chan, &dma_rx_sconfig);
if (ret < 0) {
dev_err(sport->port.dev,
"Dma slave config failed, err = %d\n", ret);
return ret;
}
sport->dma_rx_buf_virt = dma_buf;
sport->dma_rx_buf_bus = dma_bus;
sport->dma_rx_in_progress = false;
sport->dma_rx_chan_active = true;
return 0;
}
static int lpuart_startup(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
unsigned long flags;
unsigned char temp;
/* determine FIFO size and enable FIFO mode */
temp = readb(sport->port.membase + UARTPFIFO);
sport->txfifo_size = 0x1 << (((temp >> UARTPFIFO_TXSIZE_OFF) &
UARTPFIFO_FIFOSIZE_MASK) + 1);
sport->port.fifosize = sport->txfifo_size;
sport->rxfifo_size = 0x1 << (((temp >> UARTPFIFO_RXSIZE_OFF) &
UARTPFIFO_FIFOSIZE_MASK) + 1);
sport->rxdma_len = FSL_UART_RX_DMA_BUFFER_SIZE;
if (sport->dma_rx_chan && !lpuart_dma_rx_request(port)) {
sport->lpuart_dma_rx_use = true;
setup_timer(&sport->lpuart_timer, lpuart_timer_func,
(unsigned long)sport);
} else
sport->lpuart_dma_rx_use = false;
if (sport->dma_tx_chan && !lpuart_dma_tx_request(port)) {
init_waitqueue_head(&sport->dma_wait);
sport->lpuart_dma_tx_use = true;
temp = readb(port->membase + UARTCR5);
temp &= ~UARTCR5_RDMAS;
writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5);
} else
sport->lpuart_dma_tx_use = false;
spin_lock_irqsave(&sport->port.lock, flags);
lpuart_setup_watermark(sport);
temp = readb(sport->port.membase + UARTCR2);
temp |= (UARTCR2_RIE | UARTCR2_RE | UARTCR2_TE);
writeb(temp, sport->port.membase + UARTCR2);
spin_unlock_irqrestore(&sport->port.lock, flags);
return 0;
}
static int lpuart32_startup(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
struct tty_port *tty_port = &sport->port.state->port;
unsigned long flags;
unsigned long temp;
int ret;
/* some modem may need reset */
if (!tty_port_suspended(tty_port)) {
ret = device_reset(sport->port.dev);
if (ret && ret != -ENOENT)
return ret;
}
/* determine FIFO size */
temp = lpuart32_read(&sport->port, UARTFIFO);
sport->txfifo_size = 0x1 << (((temp >> UARTFIFO_TXSIZE_OFF) &
UARTFIFO_FIFOSIZE_MASK) + 1);
sport->port.fifosize = sport->txfifo_size;
sport->rxfifo_size = 0x1 << (((temp >> UARTFIFO_RXSIZE_OFF) &
UARTFIFO_FIFOSIZE_MASK) + 1);
sport->txfifo_watermark = sport->txfifo_size >> 1;
sport->rxfifo_watermark = 1;
sport->rts_watermark = sport->rxfifo_size >> 1;
sport->rxdma_len = FSL_UART_RX_DMA_BUFFER_SIZE;
if (sport->dma_rx_chan && !lpuart_dma_rx_request(port)) {
sport->lpuart_dma_rx_use = true;
if (!sport->dma_eeop)
setup_timer(&sport->lpuart_timer,
lpuart_timer_func,
(unsigned long)sport);
} else
sport->lpuart_dma_rx_use = false;
if (sport->dma_tx_chan && !lpuart_dma_tx_request(port)) {
init_waitqueue_head(&sport->dma_wait);
sport->lpuart_dma_tx_use = true;
temp = lpuart32_read(&sport->port, UARTBAUD);
temp |= UARTBAUD_TDMAE;
lpuart32_write(&sport->port, temp, UARTBAUD);
} else
sport->lpuart_dma_tx_use = false;
spin_lock_irqsave(&sport->port.lock, flags);
lpuart32_setup_watermark(sport);
temp = lpuart32_read(&sport->port, UARTCTRL);
temp |= (UARTCTRL_RIE | UARTCTRL_RE | UARTCTRL_TE);
temp |= UARTCTRL_ILIE;
temp |= UARTCTRL_IDLECFG << UARTCTRL_IDLECFG_OFF;
lpuart32_write(&sport->port, temp, UARTCTRL);
spin_unlock_irqrestore(&sport->port.lock, flags);
return 0;
}
static void lpuart_shutdown(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
unsigned char temp;
unsigned long flags;
int ret;
spin_lock_irqsave(&port->lock, flags);
/* disable Rx/Tx and interrupts */
temp = readb(port->membase + UARTCR2);
temp &= ~(UARTCR2_TE | UARTCR2_RE |
UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE);
writeb(temp, port->membase + UARTCR2);
spin_unlock_irqrestore(&port->lock, flags);
if (sport->lpuart_dma_rx_use) {
sport->dma_rx_in_progress = false;
dmaengine_terminate_all(sport->dma_rx_chan);
del_timer_sync(&sport->lpuart_timer);
lpuart_dma_rx_free(&sport->port);
}
if (sport->lpuart_dma_tx_use) {
ret = wait_event_interruptible_timeout(sport->dma_wait,
!sport->dma_tx_in_progress, msecs_to_jiffies(1));
if (ret <= 0) {
sport->dma_tx_in_progress = false;
dmaengine_terminate_all(sport->dma_tx_chan);
}
}
}
static void lpuart32_shutdown(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
unsigned long temp;
unsigned long flags;
int ret;
spin_lock_irqsave(&port->lock, flags);
/* clear statue */
temp = lpuart32_read(&sport->port, UARTSTAT);
lpuart32_write(&sport->port, temp, UARTSTAT);
/* disable Rx/Tx DMA */
temp = lpuart32_read(port, UARTBAUD);
temp &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE | UARTBAUD_RIDMAE);
lpuart32_write(port, temp, UARTBAUD);
/* disable Rx/Tx and interrupts */
temp = lpuart32_read(port, UARTCTRL);
temp &= ~(UARTCTRL_TE | UARTCTRL_RE | UARTCTRL_TIE |
UARTCTRL_TCIE | UARTCTRL_RIE | UARTCTRL_ILIE |
UARTCTRL_LOOPS);
lpuart32_write(port, temp, UARTCTRL);
lpuart32_write(port, 0, UARTMODIR);
spin_unlock_irqrestore(&port->lock, flags);
if (sport->lpuart_dma_rx_use) {
sport->dma_rx_in_progress = false;
dmaengine_terminate_all(sport->dma_rx_chan);
if (!sport->dma_eeop)
del_timer_sync(&sport->lpuart_timer);
lpuart_dma_rx_free(&sport->port);
}
if (sport->lpuart_dma_tx_use) {
ret = wait_event_interruptible_timeout(sport->dma_wait,
!sport->dma_tx_in_progress, msecs_to_jiffies(1));
if (ret <= 0) {
sport->dma_tx_in_progress = false;
dmaengine_terminate_all(sport->dma_tx_chan);
}
}
}
static void
lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
unsigned long flags;
unsigned char cr1, old_cr1, old_cr2, cr3, cr4, bdh, modem;
unsigned int baud;
unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
unsigned int sbr, brfa;
cr1 = old_cr1 = readb(sport->port.membase + UARTCR1);
old_cr2 = readb(sport->port.membase + UARTCR2);
cr3 = readb(sport->port.membase + UARTCR3);
cr4 = readb(sport->port.membase + UARTCR4);
bdh = readb(sport->port.membase + UARTBDH);
modem = readb(sport->port.membase + UARTMODEM);
/*
* only support CS8 and CS7, and for CS7 must enable PE.
* supported mode:
* - (7,e/o,1)
* - (8,n,1)
* - (8,m/s,1)
* - (8,e/o,1)
*/
while ((termios->c_cflag & CSIZE) != CS8 &&
(termios->c_cflag & CSIZE) != CS7) {
termios->c_cflag &= ~CSIZE;
termios->c_cflag |= old_csize;
old_csize = CS8;
}
if ((termios->c_cflag & CSIZE) == CS8 ||
(termios->c_cflag & CSIZE) == CS7)
cr1 = old_cr1 & ~UARTCR1_M;
if (termios->c_cflag & CMSPAR) {
if ((termios->c_cflag & CSIZE) != CS8) {
termios->c_cflag &= ~CSIZE;
termios->c_cflag |= CS8;
}
cr1 |= UARTCR1_M;
}
/*
* When auto RS-485 RTS mode is enabled,
* hardware flow control need to be disabled.
*/
if (sport->port.rs485.flags & SER_RS485_ENABLED)
termios->c_cflag &= ~CRTSCTS;
if (termios->c_cflag & CRTSCTS) {
modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
} else {
termios->c_cflag &= ~CRTSCTS;
modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
}
if (termios->c_cflag & CSTOPB)
termios->c_cflag &= ~CSTOPB;
/* parity must be enabled when CS7 to match 8-bits format */
if ((termios->c_cflag & CSIZE) == CS7)
termios->c_cflag |= PARENB;
if ((termios->c_cflag & PARENB)) {
if (termios->c_cflag & CMSPAR) {
cr1 &= ~UARTCR1_PE;
if (termios->c_cflag & PARODD)
cr3 |= UARTCR3_T8;
else
cr3 &= ~UARTCR3_T8;
} else {
cr1 |= UARTCR1_PE;
if ((termios->c_cflag & CSIZE) == CS8)
cr1 |= UARTCR1_M;
if (termios->c_cflag & PARODD)
cr1 |= UARTCR1_PT;
else
cr1 &= ~UARTCR1_PT;
}
}
/* ask the core to calculate the divisor */
baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
/*
* Need to update the Ring buffer length according to the selected
* baud rate and restart Rx DMA path.
*
* Since timer function acqures sport->port.lock, need to stop before
* acquring same lock because otherwise del_timer_sync() can deadlock.
*/
if (old && sport->lpuart_dma_rx_use) {
del_timer_sync(&sport->lpuart_timer);
lpuart_dma_rx_free(&sport->port);
}
spin_lock_irqsave(&sport->port.lock, flags);
sport->port.read_status_mask = 0;
if (termios->c_iflag & INPCK)
sport->port.read_status_mask |= (UARTSR1_FE | UARTSR1_PE);
if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
sport->port.read_status_mask |= UARTSR1_FE;
/* characters to ignore */
sport->port.ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
sport->port.ignore_status_mask |= UARTSR1_PE;
if (termios->c_iflag & IGNBRK) {
sport->port.ignore_status_mask |= UARTSR1_FE;
/*
* if we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
if (termios->c_iflag & IGNPAR)
sport->port.ignore_status_mask |= UARTSR1_OR;
}
/* update the per-port timeout */
uart_update_timeout(port, termios->c_cflag, baud);
if (sport->lpuart_dma_rx_use) {
/* Calculate delay for 1.5 DMA buffers */
sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) *
sport->rxdma_len * 3 /
sport->rxfifo_size / 2;
dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n",
sport->dma_rx_timeout * 1000 / HZ, sport->port.timeout);
if (sport->dma_rx_timeout < msecs_to_jiffies(20))
sport->dma_rx_timeout = msecs_to_jiffies(20);
}
/* wait transmit engin complete */
while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
barrier();
/* disable transmit and receive */
writeb(old_cr2 & ~(UARTCR2_TE | UARTCR2_RE),
sport->port.membase + UARTCR2);
sbr = sport->port.uartclk / (16 * baud);
brfa = ((sport->port.uartclk - (16 * sbr * baud)) * 2) / baud;
bdh &= ~UARTBDH_SBR_MASK;
bdh |= (sbr >> 8) & 0x1F;
cr4 &= ~UARTCR4_BRFA_MASK;
brfa &= UARTCR4_BRFA_MASK;
writeb(cr4 | brfa, sport->port.membase + UARTCR4);
writeb(bdh, sport->port.membase + UARTBDH);
writeb(sbr & 0xFF, sport->port.membase + UARTBDL);
writeb(cr3, sport->port.membase + UARTCR3);
writeb(cr1, sport->port.membase + UARTCR1);
writeb(modem, sport->port.membase + UARTMODEM);
/* restore control register */
writeb(old_cr2, sport->port.membase + UARTCR2);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static void
lpuart32_serial_setbrg(struct lpuart_port *sport, unsigned int baudrate)
{
u32 sbr, osr, baud_diff, tmp_osr, tmp_sbr, tmp_diff, tmp;
u32 clk = sport->port.uartclk;
/*
* The idea is to use the best OSR (over-sampling rate) possible.
* Note, OSR is typically hard-set to 16 in other LPUART instantiations.
* Loop to find the best OSR value possible, one that generates minimum
* baud_diff iterate through the rest of the supported values of OSR.
*
* Calculation Formula:
* Baud Rate = baud clock / ((OSR+1) × SBR)
*/
baud_diff = baudrate;
osr = 0;
sbr = 0;
for (tmp_osr = 4; tmp_osr <= 32; tmp_osr++) {
/* calculate the temporary sbr value */
tmp_sbr = (clk / (baudrate * tmp_osr));
if (tmp_sbr == 0)
tmp_sbr = 1;
/*
* calculate the baud rate difference based on the temporary
* osr and sbr values
*/
tmp_diff = clk / (tmp_osr * tmp_sbr) - baudrate;
/* select best values between sbr and sbr+1 */
tmp = clk / (tmp_osr * (tmp_sbr + 1));
if (tmp_diff > (baudrate - tmp)) {
tmp_diff = baudrate - tmp;
tmp_sbr++;
}
if (tmp_diff <= baud_diff) {
baud_diff = tmp_diff;
osr = tmp_osr;
sbr = tmp_sbr;
if (!baud_diff)
break;
}
}
/* handle baudrate outside acceptable rate */
if (baud_diff > ((baudrate / 100) * 3))
dev_warn(sport->port.dev,
"unacceptable baud rate difference of more than 3%%\n");
tmp = lpuart32_read(&sport->port, UARTBAUD);
if ((osr > 3) && (osr < 8))
tmp |= UARTBAUD_BOTHEDGE;
tmp &= ~(UARTBAUD_OSR_MASK << UARTBAUD_OSR_SHIFT);
tmp |= (((osr-1) & UARTBAUD_OSR_MASK) << UARTBAUD_OSR_SHIFT);
tmp &= ~UARTBAUD_SBR_MASK;
tmp |= sbr & UARTBAUD_SBR_MASK;
lpuart32_write(&sport->port, tmp, UARTBAUD);
}
static void
lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
unsigned long flags;
unsigned long ctrl, old_ctrl, bd, modem;
unsigned int baud;
unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
ctrl = old_ctrl = lpuart32_read(&sport->port, UARTCTRL);
bd = lpuart32_read(&sport->port, UARTBAUD);
modem = lpuart32_read(&sport->port, UARTMODIR);
/*
* only support CS8 and CS7, and for CS7 must enable PE.
* supported mode:
* - (7,e/o,1)
* - (8,n,1)
* - (8,m/s,1)
* - (8,e/o,1)
*/
while ((termios->c_cflag & CSIZE) != CS8 &&
(termios->c_cflag & CSIZE) != CS7) {
termios->c_cflag &= ~CSIZE;
termios->c_cflag |= old_csize;
old_csize = CS8;
}
if ((termios->c_cflag & CSIZE) == CS8 ||
(termios->c_cflag & CSIZE) == CS7)
ctrl = old_ctrl & ~UARTCTRL_M;
if (termios->c_cflag & CMSPAR) {
if ((termios->c_cflag & CSIZE) != CS8) {
termios->c_cflag &= ~CSIZE;
termios->c_cflag |= CS8;
}
ctrl |= UARTCTRL_M;
}
if (termios->c_cflag & CRTSCTS) {
modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
} else {
termios->c_cflag &= ~CRTSCTS;
modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
}
if (termios->c_cflag & CSTOPB)
bd |= UARTBAUD_SBNS;
else
bd &= ~UARTBAUD_SBNS;
/* parity must be enabled when CS7 to match 8-bits format */
if ((termios->c_cflag & CSIZE) == CS7)
termios->c_cflag |= PARENB;
if ((termios->c_cflag & PARENB)) {
if (termios->c_cflag & CMSPAR) {
ctrl &= ~UARTCTRL_PE;
ctrl |= UARTCTRL_M;
} else {
ctrl |= UARTCR1_PE;
if ((termios->c_cflag & CSIZE) == CS8)
ctrl |= UARTCTRL_M;
if (termios->c_cflag & PARODD)
ctrl |= UARTCTRL_PT;
else
ctrl &= ~UARTCTRL_PT;
}
}
/* ask the core to calculate the divisor */
baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 4);
spin_lock_irqsave(&sport->port.lock, flags);
sport->port.read_status_mask = 0;
if (termios->c_iflag & INPCK)
sport->port.read_status_mask |= (UARTSTAT_FE | UARTSTAT_PE);
if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
sport->port.read_status_mask |= UARTSTAT_FE;
/* characters to ignore */
sport->port.ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
sport->port.ignore_status_mask |= UARTSTAT_PE;
if (termios->c_iflag & IGNBRK) {
sport->port.ignore_status_mask |= UARTSTAT_FE;
/*
* if we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
if (termios->c_iflag & IGNPAR)
sport->port.ignore_status_mask |= UARTSTAT_OR;
}
/* update the per-port timeout */
uart_update_timeout(port, termios->c_cflag, baud);
if (sport->lpuart_dma_rx_use && !sport->dma_eeop) {
/* Calculate delay for 1.5 DMA buffers */
sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) *
sport->rxdma_len * 3 /
sport->rxfifo_size / 2;
dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n",
sport->dma_rx_timeout * 1000 / HZ, sport->port.timeout);
if (sport->dma_rx_timeout < msecs_to_jiffies(20))
sport->dma_rx_timeout = msecs_to_jiffies(20);
}
/* wait transmit engin complete, there disable flow control */
lpuart32_write(&sport->port, 0, UARTMODIR);
while (!(lpuart32_read(&sport->port, UARTSTAT) & UARTSTAT_TC))
barrier();
/* disable transmit and receive */
lpuart32_write(&sport->port, old_ctrl & ~(UARTCTRL_TE | UARTCTRL_RE),
UARTCTRL);
lpuart32_write(&sport->port, bd, UARTBAUD);
lpuart32_serial_setbrg(sport, baud);
lpuart32_write(&sport->port, modem, UARTMODIR);
lpuart32_write(&sport->port, ctrl, UARTCTRL);
spin_unlock_irqrestore(&sport->port.lock, flags);
/* wait baud rate stable */
usleep_range(1000, 2000);
}
static const char *lpuart_type(struct uart_port *port)
{
return "FSL_LPUART";
}
static void lpuart_release_port(struct uart_port *port)
{
/* nothing to do */
}
static int lpuart_request_port(struct uart_port *port)
{
return 0;
}
/* configure/autoconfigure the port */
static void lpuart_config_port(struct uart_port *port, int flags)
{
if (flags & UART_CONFIG_TYPE)
port->type = PORT_LPUART;
}
static int lpuart_verify_port(struct uart_port *port, struct serial_struct *ser)
{
int ret = 0;
if (ser->type != PORT_UNKNOWN && ser->type != PORT_LPUART)
ret = -EINVAL;
if (port->irq != ser->irq)
ret = -EINVAL;
if (ser->io_type != UPIO_MEM)
ret = -EINVAL;
if (port->uartclk / 16 != ser->baud_base)
ret = -EINVAL;
if (port->iobase != ser->port)
ret = -EINVAL;
if (ser->hub6 != 0)
ret = -EINVAL;
return ret;
}
static const struct uart_ops lpuart_pops = {
.tx_empty = lpuart_tx_empty,
.set_mctrl = lpuart_set_mctrl,
.get_mctrl = lpuart_get_mctrl,
.stop_tx = lpuart_stop_tx,
.start_tx = lpuart_start_tx,
.stop_rx = lpuart_stop_rx,
.break_ctl = lpuart_break_ctl,
.startup = lpuart_startup,
.shutdown = lpuart_shutdown,
.pm = lpuart_uart_pm,
.set_termios = lpuart_set_termios,
.type = lpuart_type,
.request_port = lpuart_request_port,
.release_port = lpuart_release_port,
.config_port = lpuart_config_port,
.verify_port = lpuart_verify_port,
.flush_buffer = lpuart_flush_buffer,
#if defined(CONFIG_CONSOLE_POLL)
.poll_init = lpuart_poll_init,
.poll_get_char = lpuart_poll_get_char,
.poll_put_char = lpuart_poll_put_char,
#endif
};
static const struct uart_ops lpuart32_pops = {
.tx_empty = lpuart32_tx_empty,
.set_mctrl = lpuart32_set_mctrl,
.get_mctrl = lpuart32_get_mctrl,
.stop_tx = lpuart32_stop_tx,
.start_tx = lpuart32_start_tx,
.stop_rx = lpuart32_stop_rx,
.break_ctl = lpuart32_break_ctl,
.startup = lpuart32_startup,
.shutdown = lpuart32_shutdown,
.pm = lpuart_uart_pm,
.set_termios = lpuart32_set_termios,
.type = lpuart_type,
.request_port = lpuart_request_port,
.release_port = lpuart_release_port,
.config_port = lpuart_config_port,
.verify_port = lpuart_verify_port,
.flush_buffer = lpuart_flush_buffer,
#if defined(CONFIG_CONSOLE_POLL)
.poll_init = lpuart32_poll_init,
.poll_get_char = lpuart32_poll_get_char,
.poll_put_char = lpuart32_poll_put_char,
#endif
};
static struct lpuart_port *lpuart_ports[UART_NR];
#ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE
static void lpuart_console_putchar(struct uart_port *port, int ch)
{
while (!(readb(port->membase + UARTSR1) & UARTSR1_TDRE))
barrier();
writeb(ch, port->membase + UARTDR);
}
static void lpuart32_console_putchar(struct uart_port *port, int ch)
{
while (!(lpuart32_read(port, UARTSTAT) & UARTSTAT_TDRE))
barrier();
lpuart32_write(port, ch, UARTDATA);
}
static void
lpuart_console_write(struct console *co, const char *s, unsigned int count)
{
struct lpuart_port *sport = lpuart_ports[co->index];
unsigned char old_cr2, cr2;
unsigned long flags;
int locked = 1;
if (sport->port.sysrq || oops_in_progress)
locked = spin_trylock_irqsave(&sport->port.lock, flags);
else
spin_lock_irqsave(&sport->port.lock, flags);
/* first save CR2 and then disable interrupts */
cr2 = old_cr2 = readb(sport->port.membase + UARTCR2);
cr2 |= (UARTCR2_TE | UARTCR2_RE);
cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE);
writeb(cr2, sport->port.membase + UARTCR2);
uart_console_write(&sport->port, s, count, lpuart_console_putchar);
/* wait for transmitter finish complete and restore CR2 */
while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
barrier();
writeb(old_cr2, sport->port.membase + UARTCR2);
if (locked)
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static void
lpuart32_console_write(struct console *co, const char *s, unsigned int count)
{
struct lpuart_port *sport = lpuart_ports[co->index];
unsigned long old_cr, cr;
unsigned long flags;
int locked = 1;
if (sport->port.sysrq || oops_in_progress)
locked = spin_trylock_irqsave(&sport->port.lock, flags);
else
spin_lock_irqsave(&sport->port.lock, flags);
/* first save CR2 and then disable interrupts */
cr = old_cr = lpuart32_read(&sport->port, UARTCTRL);
cr |= (UARTCTRL_TE | UARTCTRL_RE);
cr &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
lpuart32_write(&sport->port, cr, UARTCTRL);
uart_console_write(&sport->port, s, count, lpuart32_console_putchar);
/* wait for transmitter finish complete and restore CR2 */
while (!(lpuart32_read(&sport->port, UARTSTAT) & UARTSTAT_TC))
barrier();
lpuart32_write(&sport->port, old_cr, UARTCTRL);
if (locked)
spin_unlock_irqrestore(&sport->port.lock, flags);
}
/*
* if the port was already initialised (eg, by a boot loader),
* try to determine the current setup.
*/
static void __init
lpuart_console_get_options(struct lpuart_port *sport, int *baud,
int *parity, int *bits)
{
unsigned char cr, bdh, bdl, brfa;
unsigned int sbr, uartclk, baud_raw;
cr = readb(sport->port.membase + UARTCR2);
cr &= UARTCR2_TE | UARTCR2_RE;
if (!cr)
return;
/* ok, the port was enabled */
cr = readb(sport->port.membase + UARTCR1);
*parity = 'n';
if (cr & UARTCR1_PE) {
if (cr & UARTCR1_PT)
*parity = 'o';
else
*parity = 'e';
}
if (cr & UARTCR1_M)
*bits = 9;
else
*bits = 8;
bdh = readb(sport->port.membase + UARTBDH);
bdh &= UARTBDH_SBR_MASK;
bdl = readb(sport->port.membase + UARTBDL);
sbr = bdh;
sbr <<= 8;
sbr |= bdl;
brfa = readb(sport->port.membase + UARTCR4);
brfa &= UARTCR4_BRFA_MASK;
if (sport->per_clk)
uartclk = clk_get_rate(sport->per_clk);
else
uartclk = clk_get_rate(sport->ipg_clk);
/*
* baud = mod_clk/(16*(sbr[13]+(brfa)/32)
*/
baud_raw = uartclk / (16 * (sbr + brfa / 32));
if (*baud != baud_raw)
printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
"from %d to %d\n", baud_raw, *baud);
}
static void __init
lpuart32_console_get_options(struct lpuart_port *sport, int *baud,
int *parity, int *bits)
{
unsigned long cr, bd;
unsigned int sbr, osr, uartclk, baud_raw;
cr = lpuart32_read(&sport->port, UARTCTRL);
cr &= UARTCTRL_TE | UARTCTRL_RE;
if (!cr)
return;
/* ok, the port was enabled */
cr = lpuart32_read(&sport->port, UARTCTRL);
*parity = 'n';
if (cr & UARTCTRL_PE) {
if (cr & UARTCTRL_PT)
*parity = 'o';
else
*parity = 'e';
}
if (cr & UARTCTRL_M)
*bits = 9;
else
*bits = 8;
bd = lpuart32_read(&sport->port, UARTBAUD);
bd &= UARTBAUD_SBR_MASK;
sbr = bd;
osr = (bd >> UARTBAUD_OSR_SHIFT) & UARTBAUD_OSR_MASK;
if (sport->per_clk)
uartclk = clk_get_rate(sport->per_clk);
else
uartclk = clk_get_rate(sport->ipg_clk);
baud_raw = uartclk / ((osr + 1) * sbr);
if (*baud != baud_raw)
printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
"from %d to %d\n", baud_raw, *baud);
}
static int __init lpuart_console_setup(struct console *co, char *options)
{
struct lpuart_port *sport;
int baud = 115200;
int bits = 8;
int parity = 'n';
int flow = 'n';
/*
* check whether an invalid uart number has been specified, and
* if so, search for the first available port that does have
* console support.
*/
if (co->index == -1 || co->index >= ARRAY_SIZE(lpuart_ports))
co->index = 0;
sport = lpuart_ports[co->index];
if (sport == NULL)
return -ENODEV;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
if (lpuart_is_32(sport))
lpuart32_console_get_options(sport, &baud, &parity, &bits);
else
lpuart_console_get_options(sport, &baud, &parity, &bits);
if (lpuart_is_32(sport))
lpuart32_setup_watermark(sport);
else
lpuart_setup_watermark(sport);
return uart_set_options(&sport->port, co, baud, parity, bits, flow);
}
static struct uart_driver lpuart_reg;
static struct console lpuart_console = {
.name = DEV_NAME,
.write = lpuart_console_write,
.device = uart_console_device,
.setup = lpuart_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &lpuart_reg,
};
static struct console lpuart32_console = {
.name = DEV_NAME,
.write = lpuart32_console_write,
.device = uart_console_device,
.setup = lpuart_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &lpuart_reg,
};
static void lpuart_early_write(struct console *con, const char *s, unsigned n)
{
struct earlycon_device *dev = con->data;
uart_console_write(&dev->port, s, n, lpuart_console_putchar);
}
static void lpuart32_early_write(struct console *con, const char *s, unsigned n)
{
struct earlycon_device *dev = con->data;
uart_console_write(&dev->port, s, n, lpuart32_console_putchar);
}
static int __init lpuart_early_console_setup(struct earlycon_device *device,
const char *opt)
{
if (!device->port.membase)
return -ENODEV;
device->con->write = lpuart_early_write;
return 0;
}
static int __init lpuart32_early_console_setup(struct earlycon_device *device,
const char *opt)
{
if (!device->port.membase)
return -ENODEV;
device->port.iotype = UPIO_MEM32BE;
device->con->write = lpuart32_early_write;
return 0;
}
static int __init lpuart32_imx_early_console_setup(struct earlycon_device *device,
const char *opt)
{
if (!device->port.membase)
return -ENODEV;
device->port.iotype = UPIO_MEM32;
device->port.membase += IMX_REG_OFF;
device->con->write = lpuart32_early_write;
return 0;
}
// make lpuart32 mean imx:
OF_EARLYCON_DECLARE(lpuart, "fsl,vf610-lpuart", lpuart_early_console_setup);
OF_EARLYCON_DECLARE(lpuart32ls, "fsl,ls1021a-lpuart", lpuart32_early_console_setup);
OF_EARLYCON_DECLARE(lpuart32, "fsl,imx7ulp-lpuart", lpuart32_imx_early_console_setup);
OF_EARLYCON_DECLARE(lpuart32, "fsl,imx8qm-lpuart", lpuart32_imx_early_console_setup);
EARLYCON_DECLARE(lpuart, lpuart_early_console_setup);
EARLYCON_DECLARE(lpuart32, lpuart32_imx_early_console_setup);
#define LPUART_CONSOLE (&lpuart_console)
#define LPUART32_CONSOLE (&lpuart32_console)
#else
#define LPUART_CONSOLE NULL
#define LPUART32_CONSOLE NULL
#endif
static struct uart_driver lpuart_reg = {
.owner = THIS_MODULE,
.driver_name = DRIVER_NAME,
.dev_name = DEV_NAME,
.nr = ARRAY_SIZE(lpuart_ports),
.cons = LPUART_CONSOLE,
};
static int lpuart_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id = of_match_device(lpuart_dt_ids,
&pdev->dev);
const struct lpuart_soc_data *sdata = of_id->data;
struct device_node *np = pdev->dev.of_node;
struct lpuart_port *sport;
struct resource *res;
unsigned long cr_32;
unsigned char cr_8;
int ret;
sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL);
if (!sport)
return -ENOMEM;
ret = of_alias_get_id(np, "serial");
if (ret < 0) {
dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
return ret;
}
if (ret >= ARRAY_SIZE(lpuart_ports)) {
dev_err(&pdev->dev, "serial%d out of range\n", ret);
return -EINVAL;
}
sport->port.line = ret;
sport->dma_eeop = of_device_is_compatible(np, "fsl,imx8qm-lpuart");
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
sport->port.membase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(sport->port.membase))
return PTR_ERR(sport->port.membase);
sport->regbase = sport->port.membase;
sport->port.membase += sdata->reg_off;
sport->port.mapbase = res->start + sdata->reg_off;
sport->port.dev = &pdev->dev;
sport->port.type = PORT_LPUART;
ret = platform_get_irq(pdev, 0);
if (ret < 0) {
dev_err(&pdev->dev, "cannot obtain irq\n");
return ret;
}
sport->port.irq = ret;
sport->port.iotype = sdata->iotype;
if (lpuart_is_32(sport))
sport->port.ops = &lpuart32_pops;
else
sport->port.ops = &lpuart_pops;
sport->port.flags = UPF_BOOT_AUTOCONF;
if (!lpuart_is_32(sport))
sport->port.rs485_config = lpuart_config_rs485;
sport->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(sport->ipg_clk)) {
ret = PTR_ERR(sport->ipg_clk);
dev_err(&pdev->dev, "failed to get ipg clk: %d\n", ret);
return ret;
}
sport->per_clk = devm_clk_get(&pdev->dev, "per");
if (IS_ERR(sport->per_clk))
sport->per_clk = NULL;
ret = clk_prepare_enable(sport->ipg_clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable uart ipg clk: %d\n", ret);
return ret;
}
ret = clk_prepare_enable(sport->per_clk);
if (ret) {
clk_disable_unprepare(sport->ipg_clk);
dev_err(&pdev->dev, "failed to enable uart clk: %d\n", ret);
return ret;
}
if (sport->per_clk)
sport->port.uartclk = clk_get_rate(sport->per_clk);
else
sport->port.uartclk = clk_get_rate(sport->ipg_clk);
lpuart_ports[sport->port.line] = sport;
platform_set_drvdata(pdev, &sport->port);
/* Disable interrupts before request irq */
if (lpuart_is_32(sport)) {
cr_32 = lpuart32_read(&sport->port, UARTCTRL);
cr_32 &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE | UARTCTRL_ILIE);
lpuart32_write(&sport->port, cr_32, UARTCTRL);
} else {
cr_8 = readb(sport->port.membase + UARTCR2);
cr_8 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE | UARTCR2_ILIE);
writeb(cr_8, sport->port.membase + UARTCR2);
}
if (lpuart_is_32(sport)) {
lpuart_reg.cons = LPUART32_CONSOLE;
ret = devm_request_irq(&pdev->dev, sport->port.irq, lpuart32_int, 0,
DRIVER_NAME, sport);
} else {
lpuart_reg.cons = LPUART_CONSOLE;
ret = devm_request_irq(&pdev->dev, sport->port.irq, lpuart_int, 0,
DRIVER_NAME, sport);
}
if (ret)
goto failed_irq_request;
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, UART_AUTOSUSPEND_TIMEOUT);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = uart_add_one_port(&lpuart_reg, &sport->port);
if (ret)
goto failed_attach_port;
ret = lpuart_hw_reset(sport);
if (ret)
goto failed_attach_port;
sport->dma_tx_chan = dma_request_slave_channel(sport->port.dev, "tx");
if (!sport->dma_tx_chan)
dev_info(sport->port.dev, "NO DMA tx channel, run at cpu mode\n");
sport->dma_rx_chan = dma_request_slave_channel(sport->port.dev, "rx");
if (!sport->dma_rx_chan)
dev_info(sport->port.dev, "NO DMA rx channel, run at cpu mode\n");
if (!lpuart_is_32(sport) &&
of_property_read_bool(np, "linux,rs485-enabled-at-boot-time")) {
sport->port.rs485.flags |= SER_RS485_ENABLED;
sport->port.rs485.flags |= SER_RS485_RTS_ON_SEND;
writeb(UARTMODEM_TXRTSE, sport->port.membase + UARTMODEM);
}
return 0;
failed_attach_port:
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
failed_irq_request:
clk_disable_unprepare(sport->per_clk);
clk_disable_unprepare(sport->ipg_clk);
return ret;
}
static int lpuart_remove(struct platform_device *pdev)
{
struct lpuart_port *sport = platform_get_drvdata(pdev);
uart_remove_one_port(&lpuart_reg, &sport->port);
clk_disable_unprepare(sport->per_clk);
clk_disable_unprepare(sport->ipg_clk);
if (sport->dma_tx_chan)
dma_release_channel(sport->dma_tx_chan);
if (sport->dma_rx_chan)
dma_release_channel(sport->dma_rx_chan);
clk_disable_unprepare(sport->per_clk);
clk_disable_unprepare(sport->ipg_clk);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int lpuart_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct lpuart_port *sport = platform_get_drvdata(pdev);
clk_disable_unprepare(sport->per_clk);
clk_disable_unprepare(sport->ipg_clk);
return 0;
};
static int lpuart_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct lpuart_port *sport = platform_get_drvdata(pdev);
int ret;
ret = clk_prepare_enable(sport->ipg_clk);
if (ret)
return ret;
ret = clk_prepare_enable(sport->per_clk);
if (ret) {
clk_disable_unprepare(sport->ipg_clk);
return ret;
}
return 0;
};
static void serial_lpuart_enable_wakeup(struct lpuart_port *sport, bool on)
{
unsigned int val;
if (lpuart_is_32(sport)) {
val = lpuart32_read(&sport->port, UARTCTRL);
if (on)
val |= (UARTCTRL_RIE | UARTCTRL_ILIE);
else
val &= ~(UARTCTRL_RIE | UARTCTRL_ILIE);
lpuart32_write(&sport->port, val, UARTCTRL);
} else {
val = readb(sport->port.membase + UARTCR2);
if (on)
val |= UARTCR2_RIE;
else
val &= ~UARTCR2_RIE;
writeb(val, sport->port.membase + UARTCR2);
}
}
static bool lpuart_uport_is_active(struct lpuart_port *sport)
{
struct tty_port *port = &sport->port.state->port;
struct tty_struct *tty;
struct device *tty_dev;
int may_wake = 0;
tty = tty_port_tty_get(port);
if (tty) {
tty_dev = tty->dev;
may_wake = device_may_wakeup(tty_dev);
tty_kref_put(tty);
}
if ((tty_port_initialized(port) && may_wake) ||
(!console_suspend_enabled && uart_console(&sport->port)))
return true;
return false;
}
static int lpuart_suspend_noirq(struct device *dev)
{
struct lpuart_port *sport = dev_get_drvdata(dev);
bool irq_wake = irqd_is_wakeup_set(irq_get_irq_data(sport->port.irq));
if (lpuart_uport_is_active(sport))
serial_lpuart_enable_wakeup(sport, !!irq_wake);
pinctrl_pm_select_sleep_state(dev);
return 0;
}
static int lpuart_resume_noirq(struct device *dev)
{
struct lpuart_port *sport = dev_get_drvdata(dev);
unsigned int val;
pinctrl_pm_select_default_state(dev);
if (lpuart_uport_is_active(sport)) {
serial_lpuart_enable_wakeup(sport, false);
/* clear the wakeup flags */
if (lpuart_is_32(sport)) {
val = lpuart32_read(&sport->port, UARTSTAT);
lpuart32_write(&sport->port, val, UARTSTAT);
}
}
return 0;
}
static int lpuart_suspend(struct device *dev)
{
struct lpuart_port *sport = dev_get_drvdata(dev);
unsigned long temp;
unsigned long flags;
uart_suspend_port(&lpuart_reg, &sport->port);
if (lpuart_uport_is_active(sport)) {
spin_lock_irqsave(&sport->port.lock, flags);
if (lpuart_is_32(sport)) {
temp = lpuart32_read(&sport->port, UARTCTRL);
temp &= ~(UARTCTRL_TE | UARTCTRL_TIE | UARTCTRL_TCIE);
lpuart32_write(&sport->port, temp, UARTCTRL);
} else {
temp = readb(sport->port.membase + UARTCR2);
temp &= ~(UARTCR2_TE | UARTCR2_TIE | UARTCR2_TCIE);
writeb(temp, sport->port.membase + UARTCR2);
}
spin_unlock_irqrestore(&sport->port.lock, flags);
if (sport->lpuart_dma_rx_use) {
spin_lock_irqsave(&sport->port.lock, flags);
lpuart_dma_stop(sport, false);
spin_unlock_irqrestore(&sport->port.lock, flags);
dmaengine_terminate_all(sport->dma_rx_chan);
if (!sport->dma_eeop)
del_timer_sync(&sport->lpuart_timer);
lpuart_dma_rx_free(&sport->port);
}
if (sport->lpuart_dma_tx_use) {
spin_lock_irqsave(&sport->port.lock, flags);
if (lpuart_is_32(sport)) {
temp = lpuart32_read(&sport->port, UARTBAUD);
temp &= ~UARTBAUD_TDMAE;
lpuart32_write(&sport->port, temp, UARTBAUD);
} else {
temp = readb(sport->port.membase + UARTCR5);
temp &= ~UARTCR5_TDMAS;
writeb(temp, sport->port.membase + UARTCR5);
}
spin_unlock_irqrestore(&sport->port.lock, flags);
sport->dma_tx_in_progress = false;
dmaengine_terminate_all(sport->dma_tx_chan);
}
} else if (pm_runtime_active(sport->port.dev)) {
clk_disable_unprepare(sport->per_clk);
clk_disable_unprepare(sport->ipg_clk);
pm_runtime_disable(sport->port.dev);
pm_runtime_set_suspended(sport->port.dev);
}
return 0;
}
static void lpuart_console_fixup(struct lpuart_port *sport)
{
struct tty_port *port = &sport->port.state->port;
struct uart_port *uport = &sport->port;
struct device_node *np = sport->port.dev->of_node;
struct ktermios termios;
if (!lpuart_is_32(sport) || !np)
return;
/* i.MX7ULP enter VLLS mode that lpuart module power off and registers
* all lost no matter the port is wakeup source.
* For console port, console baud rate setting lost and print messy
* log when enable the console port as wakeup source. To avoid the
* issue happen, user should not enable uart port as wakeup source
* in VLLS mode, or restore console setting here.
*/
if (of_device_is_compatible(np, "fsl,imx7ulp-lpuart") &&
lpuart_uport_is_active(sport) && console_suspend_enabled &&
uart_console(&sport->port)) {
mutex_lock(&port->mutex);
memset(&termios, 0, sizeof(struct ktermios));
termios.c_cflag = uport->cons->cflag;
if (port->tty && termios.c_cflag == 0)
termios = port->tty->termios;
uport->ops->set_termios(uport, &termios, NULL);
mutex_unlock(&port->mutex);
}
}
static inline void lpuart32_resume_init(struct lpuart_port *sport)
{
unsigned long temp;
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
lpuart32_setup_watermark(sport);
temp = lpuart32_read(&sport->port, UARTCTRL);
temp |= (UARTCTRL_RIE | UARTCTRL_TIE | UARTCTRL_RE |
UARTCTRL_TE | UARTCTRL_ILIE);
if (sport->dma_rx_chan)
temp &= ~(UARTCTRL_RIE | UARTCTRL_ILIE | UARTCTRL_RE);
if (sport->dma_tx_chan)
temp &= ~(UARTCTRL_TIE | UARTCTRL_TE);
lpuart32_write(&sport->port, temp, UARTCTRL);
spin_unlock_irqrestore(&sport->port.lock, flags);
if (sport->lpuart_dma_rx_use) {
if (!lpuart_dma_rx_request(&sport->port)) {
sport->lpuart_dma_rx_use = true;
if (!sport->dma_eeop)
setup_timer(&sport->lpuart_timer,
lpuart_timer_func,
(unsigned long)sport);
} else {
sport->lpuart_dma_rx_use = false;
}
spin_lock_irqsave(&sport->port.lock, flags);
temp = lpuart32_read(&sport->port, UARTCTRL);
temp |= (UARTCTRL_RIE | UARTCTRL_ILIE | UARTCTRL_RE);
temp |= UARTCTRL_IDLECFG << UARTCTRL_IDLECFG_OFF;
lpuart32_write(&sport->port, temp, UARTCTRL);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
if (sport->lpuart_dma_tx_use) {
if (!lpuart_dma_tx_request(&sport->port)) {
init_waitqueue_head(&sport->dma_wait);
spin_lock_irqsave(&sport->port.lock, flags);
temp = lpuart32_read(&sport->port, UARTBAUD);
temp |= UARTBAUD_TDMAE;
lpuart32_write(&sport->port, temp, UARTBAUD);
spin_unlock_irqrestore(&sport->port.lock, flags);
} else {
sport->lpuart_dma_tx_use = false;
}
spin_lock_irqsave(&sport->port.lock, flags);
temp = lpuart32_read(&sport->port, UARTCTRL);
temp |= UARTCTRL_TE;
lpuart32_write(&sport->port, temp, UARTCTRL);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
}
static inline void lpuart_resume_init(struct lpuart_port *sport)
{
unsigned char temp;
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
lpuart_setup_watermark(sport);
temp = readb(sport->port.membase + UARTCR2);
temp |= (UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE);
if (sport->dma_rx_chan)
temp &= ~(UARTCR2_RIE | UARTCR2_RE);
if (sport->dma_tx_chan)
temp &= ~(UARTCR2_TIE | UARTCR2_TE);
writeb(temp, sport->port.membase + UARTCR2);
spin_unlock_irqrestore(&sport->port.lock, flags);
if (sport->lpuart_dma_rx_use) {
if (!lpuart_dma_rx_request(&sport->port)) {
sport->lpuart_dma_rx_use = true;
setup_timer(&sport->lpuart_timer,
lpuart_timer_func,
(unsigned long)sport);
} else {
sport->lpuart_dma_rx_use = false;
}
spin_lock_irqsave(&sport->port.lock, flags);
temp = readb(sport->port.membase + UARTCR2);
temp |= (UARTCR2_RIE | UARTCR2_RE);
writeb(temp, sport->port.membase + UARTCR2);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
if (sport->lpuart_dma_tx_use) {
if (!lpuart_dma_tx_request(&sport->port)) {
init_waitqueue_head(&sport->dma_wait);
spin_lock_irqsave(&sport->port.lock, flags);
temp = readb(sport->port.membase + UARTCR5);
temp |= UARTCR5_TDMAS;
writeb(temp, sport->port.membase + UARTCR5);
spin_unlock_irqrestore(&sport->port.lock, flags);
} else {
sport->lpuart_dma_tx_use = false;
}
spin_lock_irqsave(&sport->port.lock, flags);
temp = readb(sport->port.membase + UARTCR2);
temp |= UARTCR2_TE;
writeb(temp, sport->port.membase + UARTCR2);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
}
static int lpuart_resume(struct device *dev)
{
struct lpuart_port *sport = dev_get_drvdata(dev);
int ret;
if (lpuart_uport_is_active(sport)) {
if (lpuart_is_32(sport))
lpuart32_resume_init(sport);
else
lpuart_resume_init(sport);
} else if (pm_runtime_active(sport->port.dev)) {
ret = clk_prepare_enable(sport->ipg_clk);
if (ret)
return ret;
ret = clk_prepare_enable(sport->per_clk);
if (ret) {
clk_disable_unprepare(sport->ipg_clk);
return ret;
}
pm_runtime_set_active(sport->port.dev);
pm_runtime_enable(sport->port.dev);
}
lpuart_console_fixup(sport);
uart_resume_port(&lpuart_reg, &sport->port);
return 0;
}
static const struct dev_pm_ops lpuart_pm_ops = {
SET_RUNTIME_PM_OPS(lpuart_runtime_suspend,
lpuart_runtime_resume, NULL)
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(lpuart_suspend_noirq,
lpuart_resume_noirq)
SET_SYSTEM_SLEEP_PM_OPS(lpuart_suspend, lpuart_resume)
};
#define SERIAL_LPUART_PM_OPS (&lpuart_pm_ops)
#else /* !CONFIG_PM_SLEEP */
#define SERIAL_LPUART_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
static struct platform_driver lpuart_driver = {
.probe = lpuart_probe,
.remove = lpuart_remove,
.driver = {
.name = "fsl-lpuart",
.of_match_table = lpuart_dt_ids,
.pm = SERIAL_LPUART_PM_OPS,
},
};
static int __init lpuart_serial_init(void)
{
int ret = uart_register_driver(&lpuart_reg);
if (ret)
return ret;
ret = platform_driver_register(&lpuart_driver);
if (ret)
uart_unregister_driver(&lpuart_reg);
return ret;
}
static void __exit lpuart_serial_exit(void)
{
platform_driver_unregister(&lpuart_driver);
uart_unregister_driver(&lpuart_reg);
}
module_init(lpuart_serial_init);
module_exit(lpuart_serial_exit);
MODULE_DESCRIPTION("Freescale lpuart serial port driver");
MODULE_LICENSE("GPL v2");