--- /dev/null
+/*
+ * NXP (Philips) SCC+++(SCN+++) serial driver
+ *
+ * Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * Based on sc26xx.c, by Thomas Bogendörfer (tsbogend@alpha.franken.de)
+ *
+ * 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_SCCNXP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/io.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/console.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/sccnxp.h>
+
+#define SCCNXP_NAME "uart-sccnxp"
+#define SCCNXP_MAJOR 204
+#define SCCNXP_MINOR 205
+
+#define SCCNXP_MR_REG (0x00)
+# define MR0_BAUD_NORMAL (0 << 0)
+# define MR0_BAUD_EXT1 (1 << 0)
+# define MR0_BAUD_EXT2 (5 << 0)
+# define MR0_FIFO (1 << 3)
+# define MR0_TXLVL (1 << 4)
+# define MR1_BITS_5 (0 << 0)
+# define MR1_BITS_6 (1 << 0)
+# define MR1_BITS_7 (2 << 0)
+# define MR1_BITS_8 (3 << 0)
+# define MR1_PAR_EVN (0 << 2)
+# define MR1_PAR_ODD (1 << 2)
+# define MR1_PAR_NO (4 << 2)
+# define MR2_STOP1 (7 << 0)
+# define MR2_STOP2 (0xf << 0)
+#define SCCNXP_SR_REG (0x01)
+#define SCCNXP_CSR_REG SCCNXP_SR_REG
+# define SR_RXRDY (1 << 0)
+# define SR_FULL (1 << 1)
+# define SR_TXRDY (1 << 2)
+# define SR_TXEMT (1 << 3)
+# define SR_OVR (1 << 4)
+# define SR_PE (1 << 5)
+# define SR_FE (1 << 6)
+# define SR_BRK (1 << 7)
+#define SCCNXP_CR_REG (0x02)
+# define CR_RX_ENABLE (1 << 0)
+# define CR_RX_DISABLE (1 << 1)
+# define CR_TX_ENABLE (1 << 2)
+# define CR_TX_DISABLE (1 << 3)
+# define CR_CMD_MRPTR1 (0x01 << 4)
+# define CR_CMD_RX_RESET (0x02 << 4)
+# define CR_CMD_TX_RESET (0x03 << 4)
+# define CR_CMD_STATUS_RESET (0x04 << 4)
+# define CR_CMD_BREAK_RESET (0x05 << 4)
+# define CR_CMD_START_BREAK (0x06 << 4)
+# define CR_CMD_STOP_BREAK (0x07 << 4)
+# define CR_CMD_MRPTR0 (0x0b << 4)
+#define SCCNXP_RHR_REG (0x03)
+#define SCCNXP_THR_REG SCCNXP_RHR_REG
+#define SCCNXP_IPCR_REG (0x04)
+#define SCCNXP_ACR_REG SCCNXP_IPCR_REG
+# define ACR_BAUD0 (0 << 7)
+# define ACR_BAUD1 (1 << 7)
+# define ACR_TIMER_MODE (6 << 4)
+#define SCCNXP_ISR_REG (0x05)
+#define SCCNXP_IMR_REG SCCNXP_ISR_REG
+# define IMR_TXRDY (1 << 0)
+# define IMR_RXRDY (1 << 1)
+# define ISR_TXRDY(x) (1 << ((x * 4) + 0))
+# define ISR_RXRDY(x) (1 << ((x * 4) + 1))
+#define SCCNXP_IPR_REG (0x0d)
+#define SCCNXP_OPCR_REG SCCNXP_IPR_REG
+#define SCCNXP_SOP_REG (0x0e)
+#define SCCNXP_ROP_REG (0x0f)
+
+/* Route helpers */
+#define MCTRL_MASK(sig) (0xf << (sig))
+#define MCTRL_IBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_IP0)
+#define MCTRL_OBIT(cfg, sig) ((((cfg) >> (sig)) & 0xf) - LINE_OP0)
+
+/* Supported chip types */
+enum {
+ SCCNXP_TYPE_SC2681 = 2681,
+ SCCNXP_TYPE_SC2691 = 2691,
+ SCCNXP_TYPE_SC2692 = 2692,
+ SCCNXP_TYPE_SC2891 = 2891,
+ SCCNXP_TYPE_SC2892 = 2892,
+ SCCNXP_TYPE_SC28202 = 28202,
+ SCCNXP_TYPE_SC68681 = 68681,
+ SCCNXP_TYPE_SC68692 = 68692,
+};
+
+struct sccnxp_port {
+ struct uart_driver uart;
+ struct uart_port port[SCCNXP_MAX_UARTS];
+
+ const char *name;
+ int irq;
+
+ u8 imr;
+ u8 addr_mask;
+ int freq_std;
+
+ int flags;
+#define SCCNXP_HAVE_IO 0x00000001
+#define SCCNXP_HAVE_MR0 0x00000002
+
+#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
+ struct console console;
+#endif
+
+ struct mutex sccnxp_mutex;
+
+ struct sccnxp_pdata pdata;
+};
+
+static inline u8 sccnxp_raw_read(void __iomem *base, u8 reg, u8 shift)
+{
+ return readb(base + (reg << shift));
+}
+
+static inline void sccnxp_raw_write(void __iomem *base, u8 reg, u8 shift, u8 v)
+{
+ writeb(v, base + (reg << shift));
+}
+
+static inline u8 sccnxp_read(struct uart_port *port, u8 reg)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ return sccnxp_raw_read(port->membase, reg & s->addr_mask,
+ port->regshift);
+}
+
+static inline void sccnxp_write(struct uart_port *port, u8 reg, u8 v)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ sccnxp_raw_write(port->membase, reg & s->addr_mask, port->regshift, v);
+}
+
+static inline u8 sccnxp_port_read(struct uart_port *port, u8 reg)
+{
+ return sccnxp_read(port, (port->line << 3) + reg);
+}
+
+static inline void sccnxp_port_write(struct uart_port *port, u8 reg, u8 v)
+{
+ sccnxp_write(port, (port->line << 3) + reg, v);
+}
+
+static int sccnxp_update_best_err(int a, int b, int *besterr)
+{
+ int err = abs(a - b);
+
+ if ((*besterr < 0) || (*besterr > err)) {
+ *besterr = err;
+ return 0;
+ }
+
+ return 1;
+}
+
+struct baud_table {
+ u8 csr;
+ u8 acr;
+ u8 mr0;
+ int baud;
+};
+
+const struct baud_table baud_std[] = {
+ { 0, ACR_BAUD0, MR0_BAUD_NORMAL, 50, },
+ { 0, ACR_BAUD1, MR0_BAUD_NORMAL, 75, },
+ { 1, ACR_BAUD0, MR0_BAUD_NORMAL, 110, },
+ { 2, ACR_BAUD0, MR0_BAUD_NORMAL, 134, },
+ { 3, ACR_BAUD1, MR0_BAUD_NORMAL, 150, },
+ { 3, ACR_BAUD0, MR0_BAUD_NORMAL, 200, },
+ { 4, ACR_BAUD0, MR0_BAUD_NORMAL, 300, },
+ { 0, ACR_BAUD1, MR0_BAUD_EXT1, 450, },
+ { 1, ACR_BAUD0, MR0_BAUD_EXT2, 880, },
+ { 3, ACR_BAUD1, MR0_BAUD_EXT1, 900, },
+ { 5, ACR_BAUD0, MR0_BAUD_NORMAL, 600, },
+ { 7, ACR_BAUD0, MR0_BAUD_NORMAL, 1050, },
+ { 2, ACR_BAUD0, MR0_BAUD_EXT2, 1076, },
+ { 6, ACR_BAUD0, MR0_BAUD_NORMAL, 1200, },
+ { 10, ACR_BAUD1, MR0_BAUD_NORMAL, 1800, },
+ { 7, ACR_BAUD1, MR0_BAUD_NORMAL, 2000, },
+ { 8, ACR_BAUD0, MR0_BAUD_NORMAL, 2400, },
+ { 5, ACR_BAUD1, MR0_BAUD_EXT1, 3600, },
+ { 9, ACR_BAUD0, MR0_BAUD_NORMAL, 4800, },
+ { 10, ACR_BAUD0, MR0_BAUD_NORMAL, 7200, },
+ { 11, ACR_BAUD0, MR0_BAUD_NORMAL, 9600, },
+ { 8, ACR_BAUD0, MR0_BAUD_EXT1, 14400, },
+ { 12, ACR_BAUD1, MR0_BAUD_NORMAL, 19200, },
+ { 9, ACR_BAUD0, MR0_BAUD_EXT1, 28800, },
+ { 12, ACR_BAUD0, MR0_BAUD_NORMAL, 38400, },
+ { 11, ACR_BAUD0, MR0_BAUD_EXT1, 57600, },
+ { 12, ACR_BAUD1, MR0_BAUD_EXT1, 115200, },
+ { 12, ACR_BAUD0, MR0_BAUD_EXT1, 230400, },
+ { 0, 0, 0, 0 }
+};
+
+static void sccnxp_set_baud(struct uart_port *port, int baud)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+ int div_std, tmp_baud, bestbaud = baud, besterr = -1;
+ u8 i, acr = 0, csr = 0, mr0 = 0;
+
+ /* Find best baud from table */
+ for (i = 0; baud_std[i].baud && besterr; i++) {
+ if (baud_std[i].mr0 && !(s->flags & SCCNXP_HAVE_MR0))
+ continue;
+ div_std = DIV_ROUND_CLOSEST(s->freq_std, baud_std[i].baud);
+ tmp_baud = DIV_ROUND_CLOSEST(port->uartclk, div_std);
+ if (!sccnxp_update_best_err(baud, tmp_baud, &besterr)) {
+ acr = baud_std[i].acr;
+ csr = baud_std[i].csr;
+ mr0 = baud_std[i].mr0;
+ bestbaud = tmp_baud;
+ }
+ }
+
+ if (s->flags & SCCNXP_HAVE_MR0) {
+ /* Enable FIFO, set half level for TX */
+ mr0 |= MR0_FIFO | MR0_TXLVL;
+ /* Update MR0 */
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR0);
+ sccnxp_port_write(port, SCCNXP_MR_REG, mr0);
+ }
+
+ sccnxp_port_write(port, SCCNXP_ACR_REG, acr | ACR_TIMER_MODE);
+ sccnxp_port_write(port, SCCNXP_CSR_REG, (csr << 4) | csr);
+
+ dev_dbg(port->dev, "Baudrate desired: %i, calculated: %i\n",
+ baud, bestbaud);
+}
+
+static void sccnxp_enable_irq(struct uart_port *port, int mask)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ s->imr |= mask << (port->line * 4);
+ sccnxp_write(port, SCCNXP_IMR_REG, s->imr);
+}
+
+static void sccnxp_disable_irq(struct uart_port *port, int mask)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ s->imr &= ~(mask << (port->line * 4));
+ sccnxp_write(port, SCCNXP_IMR_REG, s->imr);
+}
+
+static void sccnxp_set_bit(struct uart_port *port, int sig, int state)
+{
+ u8 bitmask;
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(sig)) {
+ bitmask = 1 << MCTRL_OBIT(s->pdata.mctrl_cfg[port->line], sig);
+ if (state)
+ sccnxp_write(port, SCCNXP_SOP_REG, bitmask);
+ else
+ sccnxp_write(port, SCCNXP_ROP_REG, bitmask);
+ }
+}
+
+static void sccnxp_handle_rx(struct uart_port *port)
+{
+ u8 sr;
+ unsigned int ch, flag;
+ struct tty_struct *tty = tty_port_tty_get(&port->state->port);
+
+ if (!tty)
+ return;
+
+ for (;;) {
+ sr = sccnxp_port_read(port, SCCNXP_SR_REG);
+ if (!(sr & SR_RXRDY))
+ break;
+ sr &= SR_PE | SR_FE | SR_OVR | SR_BRK;
+
+ ch = sccnxp_port_read(port, SCCNXP_RHR_REG);
+
+ port->icount.rx++;
+ flag = TTY_NORMAL;
+
+ if (unlikely(sr)) {
+ if (sr & SR_BRK) {
+ port->icount.brk++;
+ if (uart_handle_break(port))
+ continue;
+ } else if (sr & SR_PE)
+ port->icount.parity++;
+ else if (sr & SR_FE)
+ port->icount.frame++;
+ else if (sr & SR_OVR)
+ port->icount.overrun++;
+
+ sr &= port->read_status_mask;
+ if (sr & SR_BRK)
+ flag = TTY_BREAK;
+ else if (sr & SR_PE)
+ flag = TTY_PARITY;
+ else if (sr & SR_FE)
+ flag = TTY_FRAME;
+ else if (sr & SR_OVR)
+ flag = TTY_OVERRUN;
+ }
+
+ if (uart_handle_sysrq_char(port, ch))
+ continue;
+
+ if (sr & port->ignore_status_mask)
+ continue;
+
+ uart_insert_char(port, sr, SR_OVR, ch, flag);
+ }
+
+ tty_flip_buffer_push(tty);
+
+ tty_kref_put(tty);
+}
+
+static void sccnxp_handle_tx(struct uart_port *port)
+{
+ u8 sr;
+ struct circ_buf *xmit = &port->state->xmit;
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ if (unlikely(port->x_char)) {
+ sccnxp_port_write(port, SCCNXP_THR_REG, port->x_char);
+ port->icount.tx++;
+ port->x_char = 0;
+ return;
+ }
+
+ if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ /* Disable TX if FIFO is empty */
+ if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXEMT) {
+ sccnxp_disable_irq(port, IMR_TXRDY);
+
+ /* Set direction to input */
+ if (s->flags & SCCNXP_HAVE_IO)
+ sccnxp_set_bit(port, DIR_OP, 0);
+ }
+ return;
+ }
+
+ while (!uart_circ_empty(xmit)) {
+ sr = sccnxp_port_read(port, SCCNXP_SR_REG);
+ if (!(sr & SR_TXRDY))
+ break;
+
+ sccnxp_port_write(port, SCCNXP_THR_REG, xmit->buf[xmit->tail]);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ port->icount.tx++;
+ }
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(port);
+}
+
+static irqreturn_t sccnxp_ist(int irq, void *dev_id)
+{
+ int i;
+ u8 isr;
+ struct sccnxp_port *s = (struct sccnxp_port *)dev_id;
+
+ mutex_lock(&s->sccnxp_mutex);
+
+ for (;;) {
+ isr = sccnxp_read(&s->port[0], SCCNXP_ISR_REG);
+ isr &= s->imr;
+ if (!isr)
+ break;
+
+ dev_dbg(s->port[0].dev, "IRQ status: 0x%02x\n", isr);
+
+ for (i = 0; i < s->uart.nr; i++) {
+ if (isr & ISR_RXRDY(i))
+ sccnxp_handle_rx(&s->port[i]);
+ if (isr & ISR_TXRDY(i))
+ sccnxp_handle_tx(&s->port[i]);
+ }
+ }
+
+ mutex_unlock(&s->sccnxp_mutex);
+
+ return IRQ_HANDLED;
+}
+
+static void sccnxp_start_tx(struct uart_port *port)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ mutex_lock(&s->sccnxp_mutex);
+
+ /* Set direction to output */
+ if (s->flags & SCCNXP_HAVE_IO)
+ sccnxp_set_bit(port, DIR_OP, 1);
+
+ sccnxp_enable_irq(port, IMR_TXRDY);
+
+ mutex_unlock(&s->sccnxp_mutex);
+}
+
+static void sccnxp_stop_tx(struct uart_port *port)
+{
+ /* Do nothing */
+}
+
+static void sccnxp_stop_rx(struct uart_port *port)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ mutex_lock(&s->sccnxp_mutex);
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE);
+ mutex_unlock(&s->sccnxp_mutex);
+}
+
+static unsigned int sccnxp_tx_empty(struct uart_port *port)
+{
+ u8 val;
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ mutex_lock(&s->sccnxp_mutex);
+ val = sccnxp_port_read(port, SCCNXP_SR_REG);
+ mutex_unlock(&s->sccnxp_mutex);
+
+ return (val & SR_TXEMT) ? TIOCSER_TEMT : 0;
+}
+
+static void sccnxp_enable_ms(struct uart_port *port)
+{
+ /* Do nothing */
+}
+
+static void sccnxp_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ if (!(s->flags & SCCNXP_HAVE_IO))
+ return;
+
+ mutex_lock(&s->sccnxp_mutex);
+
+ sccnxp_set_bit(port, DTR_OP, mctrl & TIOCM_DTR);
+ sccnxp_set_bit(port, RTS_OP, mctrl & TIOCM_RTS);
+
+ mutex_unlock(&s->sccnxp_mutex);
+}
+
+static unsigned int sccnxp_get_mctrl(struct uart_port *port)
+{
+ u8 bitmask, ipr;
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+ unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
+
+ if (!(s->flags & SCCNXP_HAVE_IO))
+ return mctrl;
+
+ mutex_lock(&s->sccnxp_mutex);
+
+ ipr = ~sccnxp_read(port, SCCNXP_IPCR_REG);
+
+ if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DSR_IP)) {
+ bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
+ DSR_IP);
+ mctrl &= ~TIOCM_DSR;
+ mctrl |= (ipr & bitmask) ? TIOCM_DSR : 0;
+ }
+ if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(CTS_IP)) {
+ bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
+ CTS_IP);
+ mctrl &= ~TIOCM_CTS;
+ mctrl |= (ipr & bitmask) ? TIOCM_CTS : 0;
+ }
+ if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(DCD_IP)) {
+ bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
+ DCD_IP);
+ mctrl &= ~TIOCM_CAR;
+ mctrl |= (ipr & bitmask) ? TIOCM_CAR : 0;
+ }
+ if (s->pdata.mctrl_cfg[port->line] & MCTRL_MASK(RNG_IP)) {
+ bitmask = 1 << MCTRL_IBIT(s->pdata.mctrl_cfg[port->line],
+ RNG_IP);
+ mctrl &= ~TIOCM_RNG;
+ mctrl |= (ipr & bitmask) ? TIOCM_RNG : 0;
+ }
+
+ mutex_unlock(&s->sccnxp_mutex);
+
+ return mctrl;
+}
+
+static void sccnxp_break_ctl(struct uart_port *port, int break_state)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ mutex_lock(&s->sccnxp_mutex);
+ sccnxp_port_write(port, SCCNXP_CR_REG, break_state ?
+ CR_CMD_START_BREAK : CR_CMD_STOP_BREAK);
+ mutex_unlock(&s->sccnxp_mutex);
+}
+
+static void sccnxp_set_termios(struct uart_port *port,
+ struct ktermios *termios, struct ktermios *old)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+ u8 mr1, mr2;
+ int baud;
+
+ mutex_lock(&s->sccnxp_mutex);
+
+ /* Mask termios capabilities we don't support */
+ termios->c_cflag &= ~CMSPAR;
+ termios->c_iflag &= ~(IXON | IXOFF | IXANY);
+
+ /* Disable RX & TX, reset break condition, status and FIFOs */
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET |
+ CR_RX_DISABLE | CR_TX_DISABLE);
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET);
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET);
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET);
+
+ /* Word size */
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ mr1 = MR1_BITS_5;
+ break;
+ case CS6:
+ mr1 = MR1_BITS_6;
+ break;
+ case CS7:
+ mr1 = MR1_BITS_7;
+ break;
+ default:
+ case CS8:
+ mr1 = MR1_BITS_8;
+ break;
+ }
+
+ /* Parity */
+ if (termios->c_cflag & PARENB) {
+ if (termios->c_cflag & PARODD)
+ mr1 |= MR1_PAR_ODD;
+ } else
+ mr1 |= MR1_PAR_NO;
+
+ /* Stop bits */
+ mr2 = (termios->c_cflag & CSTOPB) ? MR2_STOP2 : MR2_STOP1;
+
+ /* Update desired format */
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_MRPTR1);
+ sccnxp_port_write(port, SCCNXP_MR_REG, mr1);
+ sccnxp_port_write(port, SCCNXP_MR_REG, mr2);
+
+ /* Set read status mask */
+ port->read_status_mask = SR_OVR;
+ if (termios->c_iflag & INPCK)
+ port->read_status_mask |= SR_PE | SR_FE;
+ if (termios->c_iflag & (BRKINT | PARMRK))
+ port->read_status_mask |= SR_BRK;
+
+ /* Set status ignore mask */
+ port->ignore_status_mask = 0;
+ if (termios->c_iflag & IGNBRK)
+ port->ignore_status_mask |= SR_BRK;
+ if (!(termios->c_cflag & CREAD))
+ port->ignore_status_mask |= SR_PE | SR_OVR | SR_FE | SR_BRK;
+
+ /* Setup baudrate */
+ baud = uart_get_baud_rate(port, termios, old, 50,
+ (s->flags & SCCNXP_HAVE_MR0) ?
+ 230400 : 38400);
+ sccnxp_set_baud(port, baud);
+
+ /* Update timeout according to new baud rate */
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ /* Enable RX & TX */
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE);
+
+ mutex_unlock(&s->sccnxp_mutex);
+}
+
+static int sccnxp_startup(struct uart_port *port)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ mutex_lock(&s->sccnxp_mutex);
+
+ if (s->flags & SCCNXP_HAVE_IO) {
+ /* Outputs are controlled manually */
+ sccnxp_write(port, SCCNXP_OPCR_REG, 0);
+ }
+
+ /* Reset break condition, status and FIFOs */
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_RX_RESET);
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_TX_RESET);
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_STATUS_RESET);
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_CMD_BREAK_RESET);
+
+ /* Enable RX & TX */
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_ENABLE | CR_TX_ENABLE);
+
+ /* Enable RX interrupt */
+ sccnxp_enable_irq(port, IMR_RXRDY);
+
+ mutex_unlock(&s->sccnxp_mutex);
+
+ return 0;
+}
+
+static void sccnxp_shutdown(struct uart_port *port)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ mutex_lock(&s->sccnxp_mutex);
+
+ /* Disable interrupts */
+ sccnxp_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
+
+ /* Disable TX & RX */
+ sccnxp_port_write(port, SCCNXP_CR_REG, CR_RX_DISABLE | CR_TX_DISABLE);
+
+ /* Leave direction to input */
+ if (s->flags & SCCNXP_HAVE_IO)
+ sccnxp_set_bit(port, DIR_OP, 0);
+
+ mutex_unlock(&s->sccnxp_mutex);
+}
+
+static const char *sccnxp_type(struct uart_port *port)
+{
+ struct sccnxp_port *s = dev_get_drvdata(port->dev);
+
+ return (port->type == PORT_SC26XX) ? s->name : NULL;
+}
+
+static void sccnxp_release_port(struct uart_port *port)
+{
+ /* Do nothing */
+}
+
+static int sccnxp_request_port(struct uart_port *port)
+{
+ /* Do nothing */
+ return 0;
+}
+
+static void sccnxp_config_port(struct uart_port *port, int flags)
+{
+ if (flags & UART_CONFIG_TYPE)
+ port->type = PORT_SC26XX;
+}
+
+static int sccnxp_verify_port(struct uart_port *port, struct serial_struct *s)
+{
+ if ((s->type == PORT_UNKNOWN) || (s->type == PORT_SC26XX))
+ return 0;
+ if (s->irq == port->irq)
+ return 0;
+
+ return -EINVAL;
+}
+
+static const struct uart_ops sccnxp_ops = {
+ .tx_empty = sccnxp_tx_empty,
+ .set_mctrl = sccnxp_set_mctrl,
+ .get_mctrl = sccnxp_get_mctrl,
+ .stop_tx = sccnxp_stop_tx,
+ .start_tx = sccnxp_start_tx,
+ .stop_rx = sccnxp_stop_rx,
+ .enable_ms = sccnxp_enable_ms,
+ .break_ctl = sccnxp_break_ctl,
+ .startup = sccnxp_startup,
+ .shutdown = sccnxp_shutdown,
+ .set_termios = sccnxp_set_termios,
+ .type = sccnxp_type,
+ .release_port = sccnxp_release_port,
+ .request_port = sccnxp_request_port,
+ .config_port = sccnxp_config_port,
+ .verify_port = sccnxp_verify_port,
+};
+
+#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
+static void sccnxp_console_putchar(struct uart_port *port, int c)
+{
+ int tryes = 100000;
+
+ while (tryes--) {
+ if (sccnxp_port_read(port, SCCNXP_SR_REG) & SR_TXRDY) {
+ sccnxp_port_write(port, SCCNXP_THR_REG, c);
+ break;
+ }
+ barrier();
+ }
+}
+
+static void sccnxp_console_write(struct console *co, const char *c, unsigned n)
+{
+ struct sccnxp_port *s = (struct sccnxp_port *)co->data;
+ struct uart_port *port = &s->port[co->index];
+
+ mutex_lock(&s->sccnxp_mutex);
+ uart_console_write(port, c, n, sccnxp_console_putchar);
+ mutex_unlock(&s->sccnxp_mutex);
+}
+
+static int sccnxp_console_setup(struct console *co, char *options)
+{
+ struct sccnxp_port *s = (struct sccnxp_port *)co->data;
+ struct uart_port *port = &s->port[(co->index > 0) ? co->index : 0];
+ int baud = 9600, bits = 8, parity = 'n', flow = 'n';
+
+ if (options)
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+ return uart_set_options(port, co, baud, parity, bits, flow);
+}
+#endif
+
+static int __devinit sccnxp_probe(struct platform_device *pdev)
+{
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ int chiptype = pdev->id_entry->driver_data;
+ struct sccnxp_pdata *pdata = dev_get_platdata(&pdev->dev);
+ int i, ret, fifosize, freq_min, freq_max;
+ struct sccnxp_port *s;
+ void __iomem *membase;
+
+ if (!res) {
+ dev_err(&pdev->dev, "Missing memory resource data\n");
+ return -EADDRNOTAVAIL;
+ }
+
+ dev_set_name(&pdev->dev, SCCNXP_NAME);
+
+ s = devm_kzalloc(&pdev->dev, sizeof(struct sccnxp_port), GFP_KERNEL);
+ if (!s) {
+ dev_err(&pdev->dev, "Error allocating port structure\n");
+ return -ENOMEM;
+ }
+ platform_set_drvdata(pdev, s);
+
+ mutex_init(&s->sccnxp_mutex);
+
+ /* Individual chip settings */
+ switch (chiptype) {
+ case SCCNXP_TYPE_SC2681:
+ s->name = "SC2681";
+ s->uart.nr = 2;
+ s->freq_std = 3686400;
+ s->addr_mask = 0x0f;
+ s->flags = SCCNXP_HAVE_IO;
+ fifosize = 3;
+ freq_min = 1000000;
+ freq_max = 4000000;
+ break;
+ case SCCNXP_TYPE_SC2691:
+ s->name = "SC2691";
+ s->uart.nr = 1;
+ s->freq_std = 3686400;
+ s->addr_mask = 0x07;
+ s->flags = 0;
+ fifosize = 3;
+ freq_min = 1000000;
+ freq_max = 4000000;
+ break;
+ case SCCNXP_TYPE_SC2692:
+ s->name = "SC2692";
+ s->uart.nr = 2;
+ s->freq_std = 3686400;
+ s->addr_mask = 0x0f;
+ s->flags = SCCNXP_HAVE_IO;
+ fifosize = 3;
+ freq_min = 1000000;
+ freq_max = 4000000;
+ break;
+ case SCCNXP_TYPE_SC2891:
+ s->name = "SC2891";
+ s->uart.nr = 1;
+ s->freq_std = 3686400;
+ s->addr_mask = 0x0f;
+ s->flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0;
+ fifosize = 16;
+ freq_min = 100000;
+ freq_max = 8000000;
+ break;
+ case SCCNXP_TYPE_SC2892:
+ s->name = "SC2892";
+ s->uart.nr = 2;
+ s->freq_std = 3686400;
+ s->addr_mask = 0x0f;
+ s->flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0;
+ fifosize = 16;
+ freq_min = 100000;
+ freq_max = 8000000;
+ break;
+ case SCCNXP_TYPE_SC28202:
+ s->name = "SC28202";
+ s->uart.nr = 2;
+ s->freq_std = 14745600;
+ s->addr_mask = 0x7f;
+ s->flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0;
+ fifosize = 256;
+ freq_min = 1000000;
+ freq_max = 50000000;
+ break;
+ case SCCNXP_TYPE_SC68681:
+ s->name = "SC68681";
+ s->uart.nr = 2;
+ s->freq_std = 3686400;
+ s->addr_mask = 0x0f;
+ s->flags = SCCNXP_HAVE_IO;
+ fifosize = 3;
+ freq_min = 1000000;
+ freq_max = 4000000;
+ break;
+ case SCCNXP_TYPE_SC68692:
+ s->name = "SC68692";
+ s->uart.nr = 2;
+ s->freq_std = 3686400;
+ s->addr_mask = 0x0f;
+ s->flags = SCCNXP_HAVE_IO;
+ fifosize = 3;
+ freq_min = 1000000;
+ freq_max = 4000000;
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported chip type %i\n", chiptype);
+ ret = -ENOTSUPP;
+ goto err_out;
+ }
+
+ if (!pdata) {
+ dev_warn(&pdev->dev,
+ "No platform data supplied, using defaults\n");
+ s->pdata.frequency = s->freq_std;
+ } else
+ memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata));
+
+ s->irq = platform_get_irq(pdev, 0);
+ if (s->irq <= 0) {
+ dev_err(&pdev->dev, "Missing irq resource data\n");
+ ret = -ENXIO;
+ goto err_out;
+ }
+
+ /* Check input frequency */
+ if ((s->pdata.frequency < freq_min) ||
+ (s->pdata.frequency > freq_max)) {
+ dev_err(&pdev->dev, "Frequency out of bounds\n");
+ ret = -EINVAL;
+ goto err_out;
+ }
+
+ membase = devm_request_and_ioremap(&pdev->dev, res);
+ if (!membase) {
+ dev_err(&pdev->dev, "Failed to ioremap\n");
+ ret = -EIO;
+ goto err_out;
+ }
+
+ s->uart.owner = THIS_MODULE;
+ s->uart.dev_name = "ttySC";
+ s->uart.major = SCCNXP_MAJOR;
+ s->uart.minor = SCCNXP_MINOR;
+#ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
+ s->uart.cons = &s->console;
+ s->uart.cons->device = uart_console_device;
+ s->uart.cons->write = sccnxp_console_write;
+ s->uart.cons->setup = sccnxp_console_setup;
+ s->uart.cons->flags = CON_PRINTBUFFER;
+ s->uart.cons->index = -1;
+ s->uart.cons->data = s;
+ strcpy(s->uart.cons->name, "ttySC");
+#endif
+ ret = uart_register_driver(&s->uart);
+ if (ret) {
+ dev_err(&pdev->dev, "Registering UART driver failed\n");
+ goto err_out;
+ }
+
+ for (i = 0; i < s->uart.nr; i++) {
+ s->port[i].line = i;
+ s->port[i].dev = &pdev->dev;
+ s->port[i].irq = s->irq;
+ s->port[i].type = PORT_SC26XX;
+ s->port[i].fifosize = fifosize;
+ s->port[i].flags = UPF_SKIP_TEST | UPF_FIXED_TYPE;
+ s->port[i].iotype = UPIO_MEM;
+ s->port[i].mapbase = res->start;
+ s->port[i].membase = membase;
+ s->port[i].regshift = s->pdata.reg_shift;
+ s->port[i].uartclk = s->pdata.frequency;
+ s->port[i].ops = &sccnxp_ops;
+ uart_add_one_port(&s->uart, &s->port[i]);
+ /* Set direction to input */
+ if (s->flags & SCCNXP_HAVE_IO)
+ sccnxp_set_bit(&s->port[i], DIR_OP, 0);
+ }
+
+ /* Disable interrupts */
+ s->imr = 0;
+ sccnxp_write(&s->port[0], SCCNXP_IMR_REG, 0);
+
+ /* Board specific configure */
+ if (s->pdata.init)
+ s->pdata.init();
+
+ ret = devm_request_threaded_irq(&pdev->dev, s->irq, NULL, sccnxp_ist,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ dev_name(&pdev->dev), s);
+ if (!ret)
+ return 0;
+
+ dev_err(&pdev->dev, "Unable to reguest IRQ %i\n", s->irq);
+
+err_out:
+ platform_set_drvdata(pdev, NULL);
+
+ return ret;
+}
+
+static int __devexit sccnxp_remove(struct platform_device *pdev)
+{
+ int i;
+ struct sccnxp_port *s = platform_get_drvdata(pdev);
+
+ devm_free_irq(&pdev->dev, s->irq, s);
+
+ for (i = 0; i < s->uart.nr; i++)
+ uart_remove_one_port(&s->uart, &s->port[i]);
+
+ uart_unregister_driver(&s->uart);
+ platform_set_drvdata(pdev, NULL);
+
+ if (s->pdata.exit)
+ s->pdata.exit();
+
+ return 0;
+}
+
+static const struct platform_device_id sccnxp_id_table[] = {
+ { "sc2681", SCCNXP_TYPE_SC2681 },
+ { "sc2691", SCCNXP_TYPE_SC2691 },
+ { "sc2692", SCCNXP_TYPE_SC2692 },
+ { "sc2891", SCCNXP_TYPE_SC2891 },
+ { "sc2892", SCCNXP_TYPE_SC2892 },
+ { "sc28202", SCCNXP_TYPE_SC28202 },
+ { "sc68681", SCCNXP_TYPE_SC68681 },
+ { "sc68692", SCCNXP_TYPE_SC68692 },
+};
+MODULE_DEVICE_TABLE(platform, sccnxp_id_table);
+
+static struct platform_driver sccnxp_uart_driver = {
+ .driver = {
+ .name = SCCNXP_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = sccnxp_probe,
+ .remove = __devexit_p(sccnxp_remove),
+ .id_table = sccnxp_id_table,
+};
+module_platform_driver(sccnxp_uart_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("SCCNXP serial driver");
projects / firefly-linux-kernel-4.4.55.git / commitdiff