--- /dev/null
+/*
+ * Driver core for Samsung SoC onboard UARTs.
+ *
+ * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
+ * http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+/* Hote on 2410 error handling
+ *
+ * The s3c2410 manual has a love/hate affair with the contents of the
+ * UERSTAT register in the UART blocks, and keeps marking some of the
+ * error bits as reserved. Having checked with the s3c2410x01,
+ * it copes with BREAKs properly, so I am happy to ignore the RESERVED
+ * feature from the latter versions of the manual.
+ *
+ * If it becomes aparrent that latter versions of the 2410 remove these
+ * bits, then action will have to be taken to differentiate the versions
+ * and change the policy on BREAK
+ *
+ * BJD, 04-Nov-2004
+*/
+
+#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/serial_s3c.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/of.h>
+
+#include <asm/irq.h>
+
+#include "samsung.h"
+
+#if defined(CONFIG_SERIAL_SAMSUNG_DEBUG) && \
+ defined(CONFIG_DEBUG_LL) && \
+ !defined(MODULE)
+
+extern void printascii(const char *);
+
+__printf(1, 2)
+static void dbg(const char *fmt, ...)
+{
+ va_list va;
+ char buff[256];
+
+ va_start(va, fmt);
+ vscnprintf(buff, sizeof(buff), fmt, va);
+ va_end(va);
+
+ printascii(buff);
+}
+
+#else
+#define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0)
+#endif
+
+/* UART name and device definitions */
+
+#define S3C24XX_SERIAL_NAME "ttySAC"
+#define S3C24XX_SERIAL_MAJOR 204
+#define S3C24XX_SERIAL_MINOR 64
+
+#define S3C24XX_TX_PIO 1
+#define S3C24XX_TX_DMA 2
+#define S3C24XX_RX_PIO 1
+#define S3C24XX_RX_DMA 2
+/* macros to change one thing to another */
+
+#define tx_enabled(port) ((port)->unused[0])
+#define rx_enabled(port) ((port)->unused[1])
+
+/* flag to ignore all characters coming in */
+#define RXSTAT_DUMMY_READ (0x10000000)
+
+static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
+{
+ return container_of(port, struct s3c24xx_uart_port, port);
+}
+
+/* translate a port to the device name */
+
+static inline const char *s3c24xx_serial_portname(struct uart_port *port)
+{
+ return to_platform_device(port->dev)->name;
+}
+
+static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
+{
+ return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
+}
+
+/*
+ * s3c64xx and later SoC's include the interrupt mask and status registers in
+ * the controller itself, unlike the s3c24xx SoC's which have these registers
+ * in the interrupt controller. Check if the port type is s3c64xx or higher.
+ */
+static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
+{
+ return to_ourport(port)->info->type == PORT_S3C6400;
+}
+
+static void s3c24xx_serial_rx_enable(struct uart_port *port)
+{
+ unsigned long flags;
+ unsigned int ucon, ufcon;
+ int count = 10000;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ while (--count && !s3c24xx_serial_txempty_nofifo(port))
+ udelay(100);
+
+ ufcon = rd_regl(port, S3C2410_UFCON);
+ ufcon |= S3C2410_UFCON_RESETRX;
+ wr_regl(port, S3C2410_UFCON, ufcon);
+
+ ucon = rd_regl(port, S3C2410_UCON);
+ ucon |= S3C2410_UCON_RXIRQMODE;
+ wr_regl(port, S3C2410_UCON, ucon);
+
+ rx_enabled(port) = 1;
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void s3c24xx_serial_rx_disable(struct uart_port *port)
+{
+ unsigned long flags;
+ unsigned int ucon;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ ucon = rd_regl(port, S3C2410_UCON);
+ ucon &= ~S3C2410_UCON_RXIRQMODE;
+ wr_regl(port, S3C2410_UCON, ucon);
+
+ rx_enabled(port) = 0;
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void s3c24xx_serial_stop_tx(struct uart_port *port)
+{
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+ struct s3c24xx_uart_dma *dma = ourport->dma;
+ struct circ_buf *xmit = &port->state->xmit;
+ struct dma_tx_state state;
+ int count;
+
+ if (!tx_enabled(port))
+ return;
+
+ if (s3c24xx_serial_has_interrupt_mask(port))
+ __set_bit(S3C64XX_UINTM_TXD,
+ portaddrl(port, S3C64XX_UINTM));
+ else
+ disable_irq_nosync(ourport->tx_irq);
+
+ if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
+ dmaengine_pause(dma->tx_chan);
+ dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
+ dmaengine_terminate_all(dma->tx_chan);
+ dma_sync_single_for_cpu(ourport->port.dev,
+ dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
+ async_tx_ack(dma->tx_desc);
+ count = dma->tx_bytes_requested - state.residue;
+ xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
+ port->icount.tx += count;
+ }
+
+ tx_enabled(port) = 0;
+ ourport->tx_in_progress = 0;
+
+ if (port->flags & UPF_CONS_FLOW)
+ s3c24xx_serial_rx_enable(port);
+
+ ourport->tx_mode = 0;
+}
+
+static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
+
+static void s3c24xx_serial_tx_dma_complete(void *args)
+{
+ struct s3c24xx_uart_port *ourport = args;
+ struct uart_port *port = &ourport->port;
+ struct circ_buf *xmit = &port->state->xmit;
+ struct s3c24xx_uart_dma *dma = ourport->dma;
+ struct dma_tx_state state;
+ unsigned long flags;
+ int count;
+
+
+ dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
+ count = dma->tx_bytes_requested - state.residue;
+ async_tx_ack(dma->tx_desc);
+
+ dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
+ dma->tx_size, DMA_TO_DEVICE);
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
+ port->icount.tx += count;
+ ourport->tx_in_progress = 0;
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(port);
+
+ s3c24xx_serial_start_next_tx(ourport);
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
+{
+ struct uart_port *port = &ourport->port;
+ u32 ucon;
+
+ /* Mask Tx interrupt */
+ if (s3c24xx_serial_has_interrupt_mask(port))
+ __set_bit(S3C64XX_UINTM_TXD,
+ portaddrl(port, S3C64XX_UINTM));
+ else
+ disable_irq_nosync(ourport->tx_irq);
+
+ /* Enable tx dma mode */
+ ucon = rd_regl(port, S3C2410_UCON);
+ ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
+ ucon |= (dma_get_cache_alignment() >= 16) ?
+ S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
+ ucon |= S3C64XX_UCON_TXMODE_DMA;
+ wr_regl(port, S3C2410_UCON, ucon);
+
+ ourport->tx_mode = S3C24XX_TX_DMA;
+}
+
+static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
+{
+ struct uart_port *port = &ourport->port;
+ u32 ucon, ufcon;
+
+ /* Set ufcon txtrig */
+ ourport->tx_in_progress = S3C24XX_TX_PIO;
+ ufcon = rd_regl(port, S3C2410_UFCON);
+ wr_regl(port, S3C2410_UFCON, ufcon);
+
+ /* Enable tx pio mode */
+ ucon = rd_regl(port, S3C2410_UCON);
+ ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
+ ucon |= S3C64XX_UCON_TXMODE_CPU;
+ wr_regl(port, S3C2410_UCON, ucon);
+
+ /* Unmask Tx interrupt */
+ if (s3c24xx_serial_has_interrupt_mask(port))
+ __clear_bit(S3C64XX_UINTM_TXD,
+ portaddrl(port, S3C64XX_UINTM));
+ else
+ enable_irq(ourport->tx_irq);
+
+ ourport->tx_mode = S3C24XX_TX_PIO;
+}
+
+static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
+{
+ if (ourport->tx_mode != S3C24XX_TX_PIO)
+ enable_tx_pio(ourport);
+}
+
+static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
+ unsigned int count)
+{
+ struct uart_port *port = &ourport->port;
+ struct circ_buf *xmit = &port->state->xmit;
+ struct s3c24xx_uart_dma *dma = ourport->dma;
+
+
+ if (ourport->tx_mode != S3C24XX_TX_DMA)
+ enable_tx_dma(ourport);
+
+ while (xmit->tail & (dma_get_cache_alignment() - 1)) {
+ if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
+ return 0;
+ wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ port->icount.tx++;
+ count--;
+ }
+
+ dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
+ dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
+
+ dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
+ dma->tx_size, DMA_TO_DEVICE);
+
+ dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
+ dma->tx_transfer_addr, dma->tx_size,
+ DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
+ if (!dma->tx_desc) {
+ dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
+ return -EIO;
+ }
+
+ dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
+ dma->tx_desc->callback_param = ourport;
+ dma->tx_bytes_requested = dma->tx_size;
+
+ ourport->tx_in_progress = S3C24XX_TX_DMA;
+ dma->tx_cookie = dmaengine_submit(dma->tx_desc);
+ dma_async_issue_pending(dma->tx_chan);
+ return 0;
+}
+
+static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
+{
+ struct uart_port *port = &ourport->port;
+ struct circ_buf *xmit = &port->state->xmit;
+ unsigned long count;
+
+ /* Get data size up to the end of buffer */
+ count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+
+ if (!count) {
+ s3c24xx_serial_stop_tx(port);
+ return;
+ }
+
+ if (!ourport->dma || !ourport->dma->tx_chan || count < port->fifosize)
+ s3c24xx_serial_start_tx_pio(ourport);
+ else
+ s3c24xx_serial_start_tx_dma(ourport, count);
+}
+
+void s3c24xx_serial_start_tx(struct uart_port *port)
+{
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+ struct circ_buf *xmit = &port->state->xmit;
+
+ if (!tx_enabled(port)) {
+ if (port->flags & UPF_CONS_FLOW)
+ s3c24xx_serial_rx_disable(port);
+
+ tx_enabled(port) = 1;
+ if (!ourport->dma || !ourport->dma->tx_chan)
+ s3c24xx_serial_start_tx_pio(ourport);
+ }
+
+ if (ourport->dma && ourport->dma->tx_chan) {
+ if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
+ s3c24xx_serial_start_next_tx(ourport);
+ }
+}
+
+static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
+ struct tty_port *tty, int count)
+{
+ struct s3c24xx_uart_dma *dma = ourport->dma;
+ int copied;
+
+ if (!count)
+ return;
+
+ dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
+ dma->rx_size, DMA_FROM_DEVICE);
+
+ ourport->port.icount.rx += count;
+ if (!tty) {
+ dev_err(ourport->port.dev, "No tty port\n");
+ return;
+ }
+ copied = tty_insert_flip_string(tty,
+ ((unsigned char *)(ourport->dma->rx_buf)), count);
+ if (copied != count) {
+ WARN_ON(1);
+ dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
+ }
+}
+
+static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
+ unsigned long ufstat);
+
+static void uart_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
+{
+ struct uart_port *port = &ourport->port;
+ struct tty_port *tty = &port->state->port;
+ unsigned int ch, ufstat;
+ unsigned int count;
+
+ ufstat = rd_regl(port, S3C2410_UFSTAT);
+ count = s3c24xx_serial_rx_fifocnt(ourport, ufstat);
+
+ if (!count)
+ return;
+
+ while (count-- > 0) {
+ ch = rd_regb(port, S3C2410_URXH);
+
+ ourport->port.icount.rx++;
+ tty_insert_flip_char(tty, ch, TTY_NORMAL);
+ }
+
+ tty_flip_buffer_push(tty);
+}
+
+static void s3c24xx_serial_stop_rx(struct uart_port *port)
+{
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+ struct s3c24xx_uart_dma *dma = ourport->dma;
+ struct tty_port *t = &port->state->port;
+ struct dma_tx_state state;
+ enum dma_status dma_status;
+ unsigned int received;
+
+ if (rx_enabled(port)) {
+ dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
+ if (s3c24xx_serial_has_interrupt_mask(port))
+ __set_bit(S3C64XX_UINTM_RXD,
+ portaddrl(port, S3C64XX_UINTM));
+ else
+ disable_irq_nosync(ourport->rx_irq);
+ rx_enabled(port) = 0;
+ }
+ if (dma && dma->rx_chan) {
+ dmaengine_pause(dma->tx_chan);
+ dma_status = dmaengine_tx_status(dma->rx_chan,
+ dma->rx_cookie, &state);
+ if (dma_status == DMA_IN_PROGRESS ||
+ dma_status == DMA_PAUSED) {
+ received = dma->rx_bytes_requested - state.residue;
+ dmaengine_terminate_all(dma->rx_chan);
+ s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
+ }
+ }
+}
+
+static inline struct s3c24xx_uart_info
+ *s3c24xx_port_to_info(struct uart_port *port)
+{
+ return to_ourport(port)->info;
+}
+
+static inline struct s3c2410_uartcfg
+ *s3c24xx_port_to_cfg(struct uart_port *port)
+{
+ struct s3c24xx_uart_port *ourport;
+
+ if (port->dev == NULL)
+ return NULL;
+
+ ourport = container_of(port, struct s3c24xx_uart_port, port);
+ return ourport->cfg;
+}
+
+static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
+ unsigned long ufstat)
+{
+ struct s3c24xx_uart_info *info = ourport->info;
+
+ if (ufstat & info->rx_fifofull)
+ return ourport->port.fifosize;
+
+ return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
+}
+
+static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport);
+static void s3c24xx_serial_rx_dma_complete(void *args)
+{
+ struct s3c24xx_uart_port *ourport = args;
+ struct uart_port *port = &ourport->port;
+
+ struct s3c24xx_uart_dma *dma = ourport->dma;
+ struct tty_port *t = &port->state->port;
+ struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
+
+ struct dma_tx_state state;
+ unsigned long flags;
+ int received;
+
+ dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
+ received = dma->rx_bytes_requested - state.residue;
+ async_tx_ack(dma->rx_desc);
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ if (received)
+ s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
+
+ if (tty) {
+ tty_flip_buffer_push(t);
+ tty_kref_put(tty);
+ }
+
+ s3c64xx_start_rx_dma(ourport);
+
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
+{
+ struct s3c24xx_uart_dma *dma = ourport->dma;
+
+ dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
+ dma->rx_size, DMA_FROM_DEVICE);
+
+ dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
+ dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT);
+ if (!dma->rx_desc) {
+ dev_err(ourport->port.dev, "Unable to get desc for Rx\n");
+ return;
+ }
+
+ dma->rx_desc->callback = s3c24xx_serial_rx_dma_complete;
+ dma->rx_desc->callback_param = ourport;
+ dma->rx_bytes_requested = dma->rx_size;
+
+ dma->rx_cookie = dmaengine_submit(dma->rx_desc);
+ dma_async_issue_pending(dma->rx_chan);
+}
+
+/* ? - where has parity gone?? */
+#define S3C2410_UERSTAT_PARITY (0x1000)
+
+static void enable_rx_dma(struct s3c24xx_uart_port *ourport)
+{
+ struct uart_port *port = &ourport->port;
+ unsigned int ucon;
+
+ /* set Rx mode to DMA mode */
+ ucon = rd_regl(port, S3C2410_UCON);
+ ucon &= ~(S3C64XX_UCON_RXBURST_MASK |
+ S3C64XX_UCON_TIMEOUT_MASK |
+ S3C64XX_UCON_EMPTYINT_EN |
+ S3C64XX_UCON_DMASUS_EN |
+ S3C64XX_UCON_TIMEOUT_EN |
+ S3C64XX_UCON_RXMODE_MASK);
+ ucon |= S3C64XX_UCON_RXBURST_16 |
+ 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
+ S3C64XX_UCON_EMPTYINT_EN |
+ S3C64XX_UCON_TIMEOUT_EN |
+ S3C64XX_UCON_RXMODE_DMA;
+ wr_regl(port, S3C2410_UCON, ucon);
+
+ ourport->rx_mode = S3C24XX_RX_DMA;
+}
+
+static void enable_rx_pio(struct s3c24xx_uart_port *ourport)
+{
+ struct uart_port *port = &ourport->port;
+ unsigned int ucon;
+
+ /* set Rx mode to DMA mode */
+ ucon = rd_regl(port, S3C2410_UCON);
+ ucon &= ~(S3C64XX_UCON_TIMEOUT_MASK |
+ S3C64XX_UCON_EMPTYINT_EN |
+ S3C64XX_UCON_DMASUS_EN |
+ S3C64XX_UCON_TIMEOUT_EN |
+ S3C64XX_UCON_RXMODE_MASK);
+ ucon |= 0xf << S3C64XX_UCON_TIMEOUT_SHIFT |
+ S3C64XX_UCON_TIMEOUT_EN |
+ S3C64XX_UCON_RXMODE_CPU;
+ wr_regl(port, S3C2410_UCON, ucon);
+
+ ourport->rx_mode = S3C24XX_RX_PIO;
+}
+
+static irqreturn_t s3c24xx_serial_rx_chars_dma(int irq, void *dev_id)
+{
+ unsigned int utrstat, ufstat, received;
+ struct s3c24xx_uart_port *ourport = dev_id;
+ struct uart_port *port = &ourport->port;
+ struct s3c24xx_uart_dma *dma = ourport->dma;
+ struct tty_struct *tty = tty_port_tty_get(&ourport->port.state->port);
+ struct tty_port *t = &port->state->port;
+ unsigned long flags;
+ struct dma_tx_state state;
+
+ utrstat = rd_regl(port, S3C2410_UTRSTAT);
+ ufstat = rd_regl(port, S3C2410_UFSTAT);
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ if (!(utrstat & S3C2410_UTRSTAT_TIMEOUT)) {
+ s3c64xx_start_rx_dma(ourport);
+ if (ourport->rx_mode == S3C24XX_RX_PIO)
+ enable_rx_dma(ourport);
+ goto finish;
+ }
+
+ if (ourport->rx_mode == S3C24XX_RX_DMA) {
+ dmaengine_pause(dma->rx_chan);
+ dmaengine_tx_status(dma->rx_chan, dma->rx_cookie, &state);
+ dmaengine_terminate_all(dma->rx_chan);
+ received = dma->rx_bytes_requested - state.residue;
+ s3c24xx_uart_copy_rx_to_tty(ourport, t, received);
+
+ enable_rx_pio(ourport);
+ }
+
+ uart_rx_drain_fifo(ourport);
+
+ if (tty) {
+ tty_flip_buffer_push(t);
+ tty_kref_put(tty);
+ }
+
+ wr_regl(port, S3C2410_UTRSTAT, S3C2410_UTRSTAT_TIMEOUT);
+
+finish:
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t s3c24xx_serial_rx_chars_pio(int irq, void *dev_id)
+{
+ struct s3c24xx_uart_port *ourport = dev_id;
+ struct uart_port *port = &ourport->port;
+ unsigned int ufcon, ch, flag, ufstat, uerstat;
+ unsigned long flags;
+ int max_count = port->fifosize;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ while (max_count-- > 0) {
+ ufcon = rd_regl(port, S3C2410_UFCON);
+ ufstat = rd_regl(port, S3C2410_UFSTAT);
+
+ if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
+ break;
+
+ uerstat = rd_regl(port, S3C2410_UERSTAT);
+ ch = rd_regb(port, S3C2410_URXH);
+
+ if (port->flags & UPF_CONS_FLOW) {
+ int txe = s3c24xx_serial_txempty_nofifo(port);
+
+ if (rx_enabled(port)) {
+ if (!txe) {
+ rx_enabled(port) = 0;
+ continue;
+ }
+ } else {
+ if (txe) {
+ ufcon |= S3C2410_UFCON_RESETRX;
+ wr_regl(port, S3C2410_UFCON, ufcon);
+ rx_enabled(port) = 1;
+ spin_unlock_irqrestore(&port->lock,
+ flags);
+ goto out;
+ }
+ continue;
+ }
+ }
+
+ /* insert the character into the buffer */
+
+ flag = TTY_NORMAL;
+ port->icount.rx++;
+
+ if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
+ dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
+ ch, uerstat);
+
+ /* check for break */
+ if (uerstat & S3C2410_UERSTAT_BREAK) {
+ dbg("break!\n");
+ port->icount.brk++;
+ if (uart_handle_break(port))
+ goto ignore_char;
+ }
+
+ if (uerstat & S3C2410_UERSTAT_FRAME)
+ port->icount.frame++;
+ if (uerstat & S3C2410_UERSTAT_OVERRUN)
+ port->icount.overrun++;
+
+ uerstat &= port->read_status_mask;
+
+ if (uerstat & S3C2410_UERSTAT_BREAK)
+ flag = TTY_BREAK;
+ else if (uerstat & S3C2410_UERSTAT_PARITY)
+ flag = TTY_PARITY;
+ else if (uerstat & (S3C2410_UERSTAT_FRAME |
+ S3C2410_UERSTAT_OVERRUN))
+ flag = TTY_FRAME;
+ }
+
+ if (uart_handle_sysrq_char(port, ch))
+ goto ignore_char;
+
+ uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
+ ch, flag);
+
+ignore_char:
+ continue;
+ }
+
+ spin_unlock_irqrestore(&port->lock, flags);
+ tty_flip_buffer_push(&port->state->port);
+
+out:
+ return IRQ_HANDLED;
+}
+
+
+static irqreturn_t s3c24xx_serial_rx_chars(int irq, void *dev_id)
+{
+ struct s3c24xx_uart_port *ourport = dev_id;
+
+ if (ourport->dma && ourport->dma->rx_chan)
+ return s3c24xx_serial_rx_chars_dma(irq, dev_id);
+ return s3c24xx_serial_rx_chars_pio(irq, dev_id);
+}
+
+static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
+{
+ struct s3c24xx_uart_port *ourport = id;
+ struct uart_port *port = &ourport->port;
+ struct circ_buf *xmit = &port->state->xmit;
+ unsigned long flags;
+ int count;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+
+ if (ourport->dma && ourport->dma->tx_chan && count >= port->fifosize) {
+ s3c24xx_serial_start_tx_dma(ourport, count);
+ goto out;
+ }
+
+ if (port->x_char) {
+ wr_regb(port, S3C2410_UTXH, port->x_char);
+ port->icount.tx++;
+ port->x_char = 0;
+ goto out;
+ }
+
+ /* if there isn't anything more to transmit, or the uart is now
+ * stopped, disable the uart and exit
+ */
+
+ if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+ s3c24xx_serial_stop_tx(port);
+ goto out;
+ }
+
+ /* try and drain the buffer... */
+
+ count = port->fifosize;
+ while (!uart_circ_empty(xmit) && count-- > 0) {
+ if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
+ break;
+
+ wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ port->icount.tx++;
+ }
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
+ spin_unlock(&port->lock);
+ uart_write_wakeup(port);
+ spin_lock(&port->lock);
+ }
+
+ if (uart_circ_empty(xmit))
+ s3c24xx_serial_stop_tx(port);
+
+out:
+ spin_unlock_irqrestore(&port->lock, flags);
+ return IRQ_HANDLED;
+}
+
+/* interrupt handler for s3c64xx and later SoC's.*/
+static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
+{
+ struct s3c24xx_uart_port *ourport = id;
+ struct uart_port *port = &ourport->port;
+ unsigned int pend = rd_regl(port, S3C64XX_UINTP);
+ irqreturn_t ret = IRQ_HANDLED;
+
+ if (pend & S3C64XX_UINTM_RXD_MSK) {
+ ret = s3c24xx_serial_rx_chars(irq, id);
+ wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
+ }
+ if (pend & S3C64XX_UINTM_TXD_MSK) {
+ ret = s3c24xx_serial_tx_chars(irq, id);
+ wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
+ }
+ return ret;
+}
+
+static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
+{
+ struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+ unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
+ unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
+
+ if (ufcon & S3C2410_UFCON_FIFOMODE) {
+ if ((ufstat & info->tx_fifomask) != 0 ||
+ (ufstat & info->tx_fifofull))
+ return 0;
+
+ return 1;
+ }
+
+ return s3c24xx_serial_txempty_nofifo(port);
+}
+
+/* no modem control lines */
+static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
+{
+ unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
+
+ if (umstat & S3C2410_UMSTAT_CTS)
+ return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+ else
+ return TIOCM_CAR | TIOCM_DSR;
+}
+
+static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ unsigned int umcon = rd_regl(port, S3C2410_UMCON);
+
+ if (mctrl & TIOCM_RTS)
+ umcon |= S3C2410_UMCOM_RTS_LOW;
+ else
+ umcon &= ~S3C2410_UMCOM_RTS_LOW;
+
+ wr_regl(port, S3C2410_UMCON, umcon);
+}
+
+static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
+{
+ unsigned long flags;
+ unsigned int ucon;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ ucon = rd_regl(port, S3C2410_UCON);
+
+ if (break_state)
+ ucon |= S3C2410_UCON_SBREAK;
+ else
+ ucon &= ~S3C2410_UCON_SBREAK;
+
+ wr_regl(port, S3C2410_UCON, ucon);
+
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
+{
+ struct s3c24xx_uart_dma *dma = p->dma;
+ dma_cap_mask_t mask;
+ unsigned long flags;
+
+ /* Default slave configuration parameters */
+ dma->rx_conf.direction = DMA_DEV_TO_MEM;
+ dma->rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ dma->rx_conf.src_addr = p->port.mapbase + S3C2410_URXH;
+ dma->rx_conf.src_maxburst = 16;
+
+ dma->tx_conf.direction = DMA_MEM_TO_DEV;
+ dma->tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ dma->tx_conf.dst_addr = p->port.mapbase + S3C2410_UTXH;
+ if (dma_get_cache_alignment() >= 16)
+ dma->tx_conf.dst_maxburst = 16;
+ else
+ dma->tx_conf.dst_maxburst = 1;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ dma->rx_chan = dma_request_slave_channel_compat(mask, dma->fn,
+ dma->rx_param, p->port.dev, "rx");
+ if (!dma->rx_chan)
+ return -ENODEV;
+
+ dmaengine_slave_config(dma->rx_chan, &dma->rx_conf);
+
+ dma->tx_chan = dma_request_slave_channel_compat(mask, dma->fn,
+ dma->tx_param, p->port.dev, "tx");
+ if (!dma->tx_chan) {
+ dma_release_channel(dma->rx_chan);
+ return -ENODEV;
+ }
+
+ dmaengine_slave_config(dma->tx_chan, &dma->tx_conf);
+
+ /* RX buffer */
+ dma->rx_size = PAGE_SIZE;
+
+ dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL);
+
+ if (!dma->rx_buf) {
+ dma_release_channel(dma->rx_chan);
+ dma_release_channel(dma->tx_chan);
+ return -ENOMEM;
+ }
+
+ dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
+ dma->rx_size, DMA_FROM_DEVICE);
+
+ spin_lock_irqsave(&p->port.lock, flags);
+
+ /* TX buffer */
+ dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
+ p->port.state->xmit.buf,
+ UART_XMIT_SIZE, DMA_TO_DEVICE);
+
+ spin_unlock_irqrestore(&p->port.lock, flags);
+
+ return 0;
+}
+
+static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
+{
+ struct s3c24xx_uart_dma *dma = p->dma;
+
+ if (dma->rx_chan) {
+ dmaengine_terminate_all(dma->rx_chan);
+ dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
+ dma->rx_size, DMA_FROM_DEVICE);
+ kfree(dma->rx_buf);
+ dma_release_channel(dma->rx_chan);
+ dma->rx_chan = NULL;
+ }
+
+ if (dma->tx_chan) {
+ dmaengine_terminate_all(dma->tx_chan);
+ dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
+ UART_XMIT_SIZE, DMA_TO_DEVICE);
+ dma_release_channel(dma->tx_chan);
+ dma->tx_chan = NULL;
+ }
+}
+
+static void s3c24xx_serial_shutdown(struct uart_port *port)
+{
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+
+ if (ourport->tx_claimed) {
+ if (!s3c24xx_serial_has_interrupt_mask(port))
+ free_irq(ourport->tx_irq, ourport);
+ tx_enabled(port) = 0;
+ ourport->tx_claimed = 0;
+ ourport->tx_mode = 0;
+ }
+
+ if (ourport->rx_claimed) {
+ if (!s3c24xx_serial_has_interrupt_mask(port))
+ free_irq(ourport->rx_irq, ourport);
+ ourport->rx_claimed = 0;
+ rx_enabled(port) = 0;
+ }
+
+ /* Clear pending interrupts and mask all interrupts */
+ if (s3c24xx_serial_has_interrupt_mask(port)) {
+ free_irq(port->irq, ourport);
+
+ wr_regl(port, S3C64XX_UINTP, 0xf);
+ wr_regl(port, S3C64XX_UINTM, 0xf);
+ }
+
+ if (ourport->dma)
+ s3c24xx_serial_release_dma(ourport);
+
+ ourport->tx_in_progress = 0;
+}
+
+static int s3c24xx_serial_startup(struct uart_port *port)
+{
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+ int ret;
+
+ dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n",
+ port, (unsigned long long)port->mapbase, port->membase);
+
+ rx_enabled(port) = 1;
+
+ ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
+ s3c24xx_serial_portname(port), ourport);
+
+ if (ret != 0) {
+ dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq);
+ return ret;
+ }
+
+ ourport->rx_claimed = 1;
+
+ dbg("requesting tx irq...\n");
+
+ tx_enabled(port) = 1;
+
+ ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
+ s3c24xx_serial_portname(port), ourport);
+
+ if (ret) {
+ dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq);
+ goto err;
+ }
+
+ ourport->tx_claimed = 1;
+
+ dbg("s3c24xx_serial_startup ok\n");
+
+ /* the port reset code should have done the correct
+ * register setup for the port controls */
+
+ return ret;
+
+err:
+ s3c24xx_serial_shutdown(port);
+ return ret;
+}
+
+static int s3c64xx_serial_startup(struct uart_port *port)
+{
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+ unsigned long flags;
+ unsigned int ufcon;
+ int ret;
+
+ dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n",
+ port, (unsigned long long)port->mapbase, port->membase);
+
+ wr_regl(port, S3C64XX_UINTM, 0xf);
+ if (ourport->dma) {
+ ret = s3c24xx_serial_request_dma(ourport);
+ if (ret < 0) {
+ dev_warn(port->dev, "DMA request failed\n");
+ return ret;
+ }
+ }
+
+ ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
+ s3c24xx_serial_portname(port), ourport);
+ if (ret) {
+ dev_err(port->dev, "cannot get irq %d\n", port->irq);
+ return ret;
+ }
+
+ /* For compatibility with s3c24xx Soc's */
+ rx_enabled(port) = 1;
+ ourport->rx_claimed = 1;
+ tx_enabled(port) = 0;
+ ourport->tx_claimed = 1;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ ufcon = rd_regl(port, S3C2410_UFCON);
+ ufcon |= S3C2410_UFCON_RESETRX | S5PV210_UFCON_RXTRIG8;
+ if (!uart_console(port))
+ ufcon |= S3C2410_UFCON_RESETTX;
+ wr_regl(port, S3C2410_UFCON, ufcon);
+
+ enable_rx_pio(ourport);
+
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ /* Enable Rx Interrupt */
+ __clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM));
+
+ dbg("s3c64xx_serial_startup ok\n");
+ return ret;
+}
+
+/* power power management control */
+
+static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
+ unsigned int old)
+{
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+ int timeout = 10000;
+
+ ourport->pm_level = level;
+
+ switch (level) {
+ case 3:
+ while (--timeout && !s3c24xx_serial_txempty_nofifo(port))
+ udelay(100);
+
+ if (!IS_ERR(ourport->baudclk))
+ clk_disable_unprepare(ourport->baudclk);
+
+ clk_disable_unprepare(ourport->clk);
+ break;
+
+ case 0:
+ clk_prepare_enable(ourport->clk);
+
+ if (!IS_ERR(ourport->baudclk))
+ clk_prepare_enable(ourport->baudclk);
+
+ break;
+ default:
+ dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
+ }
+}
+
+/* baud rate calculation
+ *
+ * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
+ * of different sources, including the peripheral clock ("pclk") and an
+ * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
+ * with a programmable extra divisor.
+ *
+ * The following code goes through the clock sources, and calculates the
+ * baud clocks (and the resultant actual baud rates) and then tries to
+ * pick the closest one and select that.
+ *
+*/
+
+#define MAX_CLK_NAME_LENGTH 15
+
+static inline int s3c24xx_serial_getsource(struct uart_port *port)
+{
+ struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+ unsigned int ucon;
+
+ if (info->num_clks == 1)
+ return 0;
+
+ ucon = rd_regl(port, S3C2410_UCON);
+ ucon &= info->clksel_mask;
+ return ucon >> info->clksel_shift;
+}
+
+static void s3c24xx_serial_setsource(struct uart_port *port,
+ unsigned int clk_sel)
+{
+ struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+ unsigned int ucon;
+
+ if (info->num_clks == 1)
+ return;
+
+ ucon = rd_regl(port, S3C2410_UCON);
+ if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
+ return;
+
+ ucon &= ~info->clksel_mask;
+ ucon |= clk_sel << info->clksel_shift;
+ wr_regl(port, S3C2410_UCON, ucon);
+}
+
+static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
+ unsigned int req_baud, struct clk **best_clk,
+ unsigned int *clk_num)
+{
+ struct s3c24xx_uart_info *info = ourport->info;
+ struct clk *clk;
+ unsigned long rate;
+ unsigned int cnt, baud, quot, clk_sel, best_quot = 0;
+ char clkname[MAX_CLK_NAME_LENGTH];
+ int calc_deviation, deviation = (1 << 30) - 1;
+
+ clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
+ ourport->info->def_clk_sel;
+ for (cnt = 0; cnt < info->num_clks; cnt++) {
+ if (!(clk_sel & (1 << cnt)))
+ continue;
+
+ sprintf(clkname, "clk_uart_baud%d", cnt);
+ clk = clk_get(ourport->port.dev, clkname);
+ if (IS_ERR(clk))
+ continue;
+
+ rate = clk_get_rate(clk);
+ if (!rate)
+ continue;
+
+ if (ourport->info->has_divslot) {
+ unsigned long div = rate / req_baud;
+
+ /* The UDIVSLOT register on the newer UARTs allows us to
+ * get a divisor adjustment of 1/16th on the baud clock.
+ *
+ * We don't keep the UDIVSLOT value (the 16ths we
+ * calculated by not multiplying the baud by 16) as it
+ * is easy enough to recalculate.
+ */
+
+ quot = div / 16;
+ baud = rate / div;
+ } else {
+ quot = (rate + (8 * req_baud)) / (16 * req_baud);
+ baud = rate / (quot * 16);
+ }
+ quot--;
+
+ calc_deviation = req_baud - baud;
+ if (calc_deviation < 0)
+ calc_deviation = -calc_deviation;
+
+ if (calc_deviation < deviation) {
+ *best_clk = clk;
+ best_quot = quot;
+ *clk_num = cnt;
+ deviation = calc_deviation;
+ }
+ }
+
+ return best_quot;
+}
+
+/* udivslot_table[]
+ *
+ * This table takes the fractional value of the baud divisor and gives
+ * the recommended setting for the UDIVSLOT register.
+ */
+static u16 udivslot_table[16] = {
+ [0] = 0x0000,
+ [1] = 0x0080,
+ [2] = 0x0808,
+ [3] = 0x0888,
+ [4] = 0x2222,
+ [5] = 0x4924,
+ [6] = 0x4A52,
+ [7] = 0x54AA,
+ [8] = 0x5555,
+ [9] = 0xD555,
+ [10] = 0xD5D5,
+ [11] = 0xDDD5,
+ [12] = 0xDDDD,
+ [13] = 0xDFDD,
+ [14] = 0xDFDF,
+ [15] = 0xFFDF,
+};
+
+static void s3c24xx_serial_set_termios(struct uart_port *port,
+ struct ktermios *termios,
+ struct ktermios *old)
+{
+ struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+ struct clk *clk = ERR_PTR(-EINVAL);
+ unsigned long flags;
+ unsigned int baud, quot, clk_sel = 0;
+ unsigned int ulcon;
+ unsigned int umcon;
+ unsigned int udivslot = 0;
+
+ /*
+ * We don't support modem control lines.
+ */
+ termios->c_cflag &= ~(HUPCL | CMSPAR);
+ termios->c_cflag |= CLOCAL;
+
+ /*
+ * Ask the core to calculate the divisor for us.
+ */
+
+ baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
+ quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
+ if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
+ quot = port->custom_divisor;
+ if (IS_ERR(clk))
+ return;
+
+ /* check to see if we need to change clock source */
+
+ if (ourport->baudclk != clk) {
+ s3c24xx_serial_setsource(port, clk_sel);
+
+ if (!IS_ERR(ourport->baudclk)) {
+ clk_disable_unprepare(ourport->baudclk);
+ ourport->baudclk = ERR_PTR(-EINVAL);
+ }
+
+ clk_prepare_enable(clk);
+
+ ourport->baudclk = clk;
+ ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
+ }
+
+ if (ourport->info->has_divslot) {
+ unsigned int div = ourport->baudclk_rate / baud;
+
+ if (cfg->has_fracval) {
+ udivslot = (div & 15);
+ dbg("fracval = %04x\n", udivslot);
+ } else {
+ udivslot = udivslot_table[div & 15];
+ dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
+ }
+ }
+
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ dbg("config: 5bits/char\n");
+ ulcon = S3C2410_LCON_CS5;
+ break;
+ case CS6:
+ dbg("config: 6bits/char\n");
+ ulcon = S3C2410_LCON_CS6;
+ break;
+ case CS7:
+ dbg("config: 7bits/char\n");
+ ulcon = S3C2410_LCON_CS7;
+ break;
+ case CS8:
+ default:
+ dbg("config: 8bits/char\n");
+ ulcon = S3C2410_LCON_CS8;
+ break;
+ }
+
+ /* preserve original lcon IR settings */
+ ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
+
+ if (termios->c_cflag & CSTOPB)
+ ulcon |= S3C2410_LCON_STOPB;
+
+ if (termios->c_cflag & PARENB) {
+ if (termios->c_cflag & PARODD)
+ ulcon |= S3C2410_LCON_PODD;
+ else
+ ulcon |= S3C2410_LCON_PEVEN;
+ } else {
+ ulcon |= S3C2410_LCON_PNONE;
+ }
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
+ ulcon, quot, udivslot);
+
+ wr_regl(port, S3C2410_ULCON, ulcon);
+ wr_regl(port, S3C2410_UBRDIV, quot);
+
+ umcon = rd_regl(port, S3C2410_UMCON);
+ if (termios->c_cflag & CRTSCTS) {
+ umcon |= S3C2410_UMCOM_AFC;
+ /* Disable RTS when RX FIFO contains 63 bytes */
+ umcon &= ~S3C2412_UMCON_AFC_8;
+ } else {
+ umcon &= ~S3C2410_UMCOM_AFC;
+ }
+ wr_regl(port, S3C2410_UMCON, umcon);
+
+ if (ourport->info->has_divslot)
+ wr_regl(port, S3C2443_DIVSLOT, udivslot);
+
+ dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
+ rd_regl(port, S3C2410_ULCON),
+ rd_regl(port, S3C2410_UCON),
+ rd_regl(port, S3C2410_UFCON));
+
+ /*
+ * Update the per-port timeout.
+ */
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ /*
+ * Which character status flags are we interested in?
+ */
+ port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
+ if (termios->c_iflag & INPCK)
+ port->read_status_mask |= S3C2410_UERSTAT_FRAME |
+ S3C2410_UERSTAT_PARITY;
+ /*
+ * Which character status flags should we ignore?
+ */
+ port->ignore_status_mask = 0;
+ if (termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
+ if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
+
+ /*
+ * Ignore all characters if CREAD is not set.
+ */
+ if ((termios->c_cflag & CREAD) == 0)
+ port->ignore_status_mask |= RXSTAT_DUMMY_READ;
+
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *s3c24xx_serial_type(struct uart_port *port)
+{
+ switch (port->type) {
+ case PORT_S3C2410:
+ return "S3C2410";
+ case PORT_S3C2440:
+ return "S3C2440";
+ case PORT_S3C2412:
+ return "S3C2412";
+ case PORT_S3C6400:
+ return "S3C6400/10";
+ default:
+ return NULL;
+ }
+}
+
+#define MAP_SIZE (0x100)
+
+static void s3c24xx_serial_release_port(struct uart_port *port)
+{
+ release_mem_region(port->mapbase, MAP_SIZE);
+}
+
+static int s3c24xx_serial_request_port(struct uart_port *port)
+{
+ const char *name = s3c24xx_serial_portname(port);
+ return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
+}
+
+static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
+{
+ struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+
+ if (flags & UART_CONFIG_TYPE &&
+ s3c24xx_serial_request_port(port) == 0)
+ port->type = info->type;
+}
+
+/*
+ * verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int
+s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+ struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+
+ if (ser->type != PORT_UNKNOWN && ser->type != info->type)
+ return -EINVAL;
+
+ return 0;
+}
+
+
+#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
+
+static struct console s3c24xx_serial_console;
+
+static int __init s3c24xx_serial_console_init(void)
+{
+ register_console(&s3c24xx_serial_console);
+ return 0;
+}
+console_initcall(s3c24xx_serial_console_init);
+
+#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
+#else
+#define S3C24XX_SERIAL_CONSOLE NULL
+#endif
+
+#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
+static int s3c24xx_serial_get_poll_char(struct uart_port *port);
+static void s3c24xx_serial_put_poll_char(struct uart_port *port,
+ unsigned char c);
+#endif
+
+static struct uart_ops s3c24xx_serial_ops = {
+ .pm = s3c24xx_serial_pm,
+ .tx_empty = s3c24xx_serial_tx_empty,
+ .get_mctrl = s3c24xx_serial_get_mctrl,
+ .set_mctrl = s3c24xx_serial_set_mctrl,
+ .stop_tx = s3c24xx_serial_stop_tx,
+ .start_tx = s3c24xx_serial_start_tx,
+ .stop_rx = s3c24xx_serial_stop_rx,
+ .break_ctl = s3c24xx_serial_break_ctl,
+ .startup = s3c24xx_serial_startup,
+ .shutdown = s3c24xx_serial_shutdown,
+ .set_termios = s3c24xx_serial_set_termios,
+ .type = s3c24xx_serial_type,
+ .release_port = s3c24xx_serial_release_port,
+ .request_port = s3c24xx_serial_request_port,
+ .config_port = s3c24xx_serial_config_port,
+ .verify_port = s3c24xx_serial_verify_port,
+#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
+ .poll_get_char = s3c24xx_serial_get_poll_char,
+ .poll_put_char = s3c24xx_serial_put_poll_char,
+#endif
+};
+
+static struct uart_driver s3c24xx_uart_drv = {
+ .owner = THIS_MODULE,
+ .driver_name = "s3c2410_serial",
+ .nr = CONFIG_SERIAL_SAMSUNG_UARTS,
+ .cons = S3C24XX_SERIAL_CONSOLE,
+ .dev_name = S3C24XX_SERIAL_NAME,
+ .major = S3C24XX_SERIAL_MAJOR,
+ .minor = S3C24XX_SERIAL_MINOR,
+};
+
+#define __PORT_LOCK_UNLOCKED(i) \
+ __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[i].port.lock)
+static struct s3c24xx_uart_port
+s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
+ [0] = {
+ .port = {
+ .lock = __PORT_LOCK_UNLOCKED(0),
+ .iotype = UPIO_MEM,
+ .uartclk = 0,
+ .fifosize = 16,
+ .ops = &s3c24xx_serial_ops,
+ .flags = UPF_BOOT_AUTOCONF,
+ .line = 0,
+ }
+ },
+ [1] = {
+ .port = {
+ .lock = __PORT_LOCK_UNLOCKED(1),
+ .iotype = UPIO_MEM,
+ .uartclk = 0,
+ .fifosize = 16,
+ .ops = &s3c24xx_serial_ops,
+ .flags = UPF_BOOT_AUTOCONF,
+ .line = 1,
+ }
+ },
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 2
+
+ [2] = {
+ .port = {
+ .lock = __PORT_LOCK_UNLOCKED(2),
+ .iotype = UPIO_MEM,
+ .uartclk = 0,
+ .fifosize = 16,
+ .ops = &s3c24xx_serial_ops,
+ .flags = UPF_BOOT_AUTOCONF,
+ .line = 2,
+ }
+ },
+#endif
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 3
+ [3] = {
+ .port = {
+ .lock = __PORT_LOCK_UNLOCKED(3),
+ .iotype = UPIO_MEM,
+ .uartclk = 0,
+ .fifosize = 16,
+ .ops = &s3c24xx_serial_ops,
+ .flags = UPF_BOOT_AUTOCONF,
+ .line = 3,
+ }
+ }
+#endif
+};
+#undef __PORT_LOCK_UNLOCKED
+
+/* s3c24xx_serial_resetport
+ *
+ * reset the fifos and other the settings.
+*/
+
+static void s3c24xx_serial_resetport(struct uart_port *port,
+ struct s3c2410_uartcfg *cfg)
+{
+ struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+ unsigned long ucon = rd_regl(port, S3C2410_UCON);
+ unsigned int ucon_mask;
+
+ ucon_mask = info->clksel_mask;
+ if (info->type == PORT_S3C2440)
+ ucon_mask |= S3C2440_UCON0_DIVMASK;
+
+ ucon &= ucon_mask;
+ wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
+
+ /* reset both fifos */
+ wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
+ wr_regl(port, S3C2410_UFCON, cfg->ufcon);
+
+ /* some delay is required after fifo reset */
+ udelay(1);
+}
+
+
+#ifdef CONFIG_CPU_FREQ
+
+static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
+ unsigned long val, void *data)
+{
+ struct s3c24xx_uart_port *port;
+ struct uart_port *uport;
+
+ port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
+ uport = &port->port;
+
+ /* check to see if port is enabled */
+
+ if (port->pm_level != 0)
+ return 0;
+
+ /* try and work out if the baudrate is changing, we can detect
+ * a change in rate, but we do not have support for detecting
+ * a disturbance in the clock-rate over the change.
+ */
+
+ if (IS_ERR(port->baudclk))
+ goto exit;
+
+ if (port->baudclk_rate == clk_get_rate(port->baudclk))
+ goto exit;
+
+ if (val == CPUFREQ_PRECHANGE) {
+ /* we should really shut the port down whilst the
+ * frequency change is in progress. */
+
+ } else if (val == CPUFREQ_POSTCHANGE) {
+ struct ktermios *termios;
+ struct tty_struct *tty;
+
+ if (uport->state == NULL)
+ goto exit;
+
+ tty = uport->state->port.tty;
+
+ if (tty == NULL)
+ goto exit;
+
+ termios = &tty->termios;
+
+ if (termios == NULL) {
+ dev_warn(uport->dev, "%s: no termios?\n", __func__);
+ goto exit;
+ }
+
+ s3c24xx_serial_set_termios(uport, termios, NULL);
+ }
+
+exit:
+ return 0;
+}
+
+static inline int
+s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
+{
+ port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
+
+ return cpufreq_register_notifier(&port->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+static inline void
+s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
+{
+ cpufreq_unregister_notifier(&port->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+#else
+static inline int
+s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
+{
+ return 0;
+}
+
+static inline void
+s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
+{
+}
+#endif
+
+/* s3c24xx_serial_init_port
+ *
+ * initialise a single serial port from the platform device given
+ */
+
+static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
+ struct platform_device *platdev)
+{
+ struct uart_port *port = &ourport->port;
+ struct s3c2410_uartcfg *cfg = ourport->cfg;
+ struct resource *res;
+ int ret;
+
+ dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
+
+ if (platdev == NULL)
+ return -ENODEV;
+
+ if (port->mapbase != 0)
+ return 0;
+
+ /* setup info for port */
+ port->dev = &platdev->dev;
+
+ /* Startup sequence is different for s3c64xx and higher SoC's */
+ if (s3c24xx_serial_has_interrupt_mask(port))
+ s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
+
+ port->uartclk = 1;
+
+ if (cfg->uart_flags & UPF_CONS_FLOW) {
+ dbg("s3c24xx_serial_init_port: enabling flow control\n");
+ port->flags |= UPF_CONS_FLOW;
+ }
+
+ /* sort our the physical and virtual addresses for each UART */
+
+ res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(port->dev, "failed to find memory resource for uart\n");
+ return -EINVAL;
+ }
+
+ dbg("resource %pR)\n", res);
+
+ port->membase = devm_ioremap(port->dev, res->start, resource_size(res));
+ if (!port->membase) {
+ dev_err(port->dev, "failed to remap controller address\n");
+ return -EBUSY;
+ }
+
+ port->mapbase = res->start;
+ ret = platform_get_irq(platdev, 0);
+ if (ret < 0)
+ port->irq = 0;
+ else {
+ port->irq = ret;
+ ourport->rx_irq = ret;
+ ourport->tx_irq = ret + 1;
+ }
+
+ ret = platform_get_irq(platdev, 1);
+ if (ret > 0)
+ ourport->tx_irq = ret;
+ /*
+ * DMA is currently supported only on DT platforms, if DMA properties
+ * are specified.
+ */
+ if (platdev->dev.of_node && of_find_property(platdev->dev.of_node,
+ "dmas", NULL)) {
+ ourport->dma = devm_kzalloc(port->dev,
+ sizeof(*ourport->dma),
+ GFP_KERNEL);
+ if (!ourport->dma)
+ return -ENOMEM;
+ }
+
+ ourport->clk = clk_get(&platdev->dev, "uart");
+ if (IS_ERR(ourport->clk)) {
+ pr_err("%s: Controller clock not found\n",
+ dev_name(&platdev->dev));
+ return PTR_ERR(ourport->clk);
+ }
+
+ ret = clk_prepare_enable(ourport->clk);
+ if (ret) {
+ pr_err("uart: clock failed to prepare+enable: %d\n", ret);
+ clk_put(ourport->clk);
+ return ret;
+ }
+
+ /* Keep all interrupts masked and cleared */
+ if (s3c24xx_serial_has_interrupt_mask(port)) {
+ wr_regl(port, S3C64XX_UINTM, 0xf);
+ wr_regl(port, S3C64XX_UINTP, 0xf);
+ wr_regl(port, S3C64XX_UINTSP, 0xf);
+ }
+
+ dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
+ &port->mapbase, port->membase, port->irq,
+ ourport->rx_irq, ourport->tx_irq, port->uartclk);
+
+ /* reset the fifos (and setup the uart) */
+ s3c24xx_serial_resetport(port, cfg);
+ return 0;
+}
+
+/* Device driver serial port probe */
+
+static const struct of_device_id s3c24xx_uart_dt_match[];
+static int probe_index;
+
+static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
+ struct platform_device *pdev)
+{
+#ifdef CONFIG_OF
+ if (pdev->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
+ return (struct s3c24xx_serial_drv_data *)match->data;
+ }
+#endif
+ return (struct s3c24xx_serial_drv_data *)
+ platform_get_device_id(pdev)->driver_data;
+}
+
+static int s3c24xx_serial_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct s3c24xx_uart_port *ourport;
+ int index = probe_index;
+ int ret;
+
+ if (np) {
+ ret = of_alias_get_id(np, "serial");
+ if (ret >= 0)
+ index = ret;
+ }
+
+ dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index);
+
+ ourport = &s3c24xx_serial_ports[index];
+
+ ourport->drv_data = s3c24xx_get_driver_data(pdev);
+ if (!ourport->drv_data) {
+ dev_err(&pdev->dev, "could not find driver data\n");
+ return -ENODEV;
+ }
+
+ ourport->baudclk = ERR_PTR(-EINVAL);
+ ourport->info = ourport->drv_data->info;
+ ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
+ dev_get_platdata(&pdev->dev) :
+ ourport->drv_data->def_cfg;
+
+ if (np)
+ of_property_read_u32(np,
+ "samsung,uart-fifosize", &ourport->port.fifosize);
+
+ if (ourport->drv_data->fifosize[index])
+ ourport->port.fifosize = ourport->drv_data->fifosize[index];
+ else if (ourport->info->fifosize)
+ ourport->port.fifosize = ourport->info->fifosize;
+
+ probe_index++;
+
+ dbg("%s: initialising port %p...\n", __func__, ourport);
+
+ ret = s3c24xx_serial_init_port(ourport, pdev);
+ if (ret < 0)
+ return ret;
+
+ if (!s3c24xx_uart_drv.state) {
+ ret = uart_register_driver(&s3c24xx_uart_drv);
+ if (ret < 0) {
+ pr_err("Failed to register Samsung UART driver\n");
+ return ret;
+ }
+ }
+
+ dbg("%s: adding port\n", __func__);
+ uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
+ platform_set_drvdata(pdev, &ourport->port);
+
+ /*
+ * Deactivate the clock enabled in s3c24xx_serial_init_port here,
+ * so that a potential re-enablement through the pm-callback overlaps
+ * and keeps the clock enabled in this case.
+ */
+ clk_disable_unprepare(ourport->clk);
+
+ ret = s3c24xx_serial_cpufreq_register(ourport);
+ if (ret < 0)
+ dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
+
+ return 0;
+}
+
+static int s3c24xx_serial_remove(struct platform_device *dev)
+{
+ struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
+
+ if (port) {
+ s3c24xx_serial_cpufreq_deregister(to_ourport(port));
+ uart_remove_one_port(&s3c24xx_uart_drv, port);
+ }
+
+ uart_unregister_driver(&s3c24xx_uart_drv);
+
+ return 0;
+}
+
+/* UART power management code */
+#ifdef CONFIG_PM_SLEEP
+static int s3c24xx_serial_suspend(struct device *dev)
+{
+ struct uart_port *port = s3c24xx_dev_to_port(dev);
+
+ if (port)
+ uart_suspend_port(&s3c24xx_uart_drv, port);
+
+ return 0;
+}
+
+static int s3c24xx_serial_resume(struct device *dev)
+{
+ struct uart_port *port = s3c24xx_dev_to_port(dev);
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+
+ if (port) {
+ clk_prepare_enable(ourport->clk);
+ s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
+ clk_disable_unprepare(ourport->clk);
+
+ uart_resume_port(&s3c24xx_uart_drv, port);
+ }
+
+ return 0;
+}
+
+static int s3c24xx_serial_resume_noirq(struct device *dev)
+{
+ struct uart_port *port = s3c24xx_dev_to_port(dev);
+
+ if (port) {
+ /* restore IRQ mask */
+ if (s3c24xx_serial_has_interrupt_mask(port)) {
+ unsigned int uintm = 0xf;
+ if (tx_enabled(port))
+ uintm &= ~S3C64XX_UINTM_TXD_MSK;
+ if (rx_enabled(port))
+ uintm &= ~S3C64XX_UINTM_RXD_MSK;
+ wr_regl(port, S3C64XX_UINTM, uintm);
+ }
+ }
+
+ return 0;
+}
+
+static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
+ .suspend = s3c24xx_serial_suspend,
+ .resume = s3c24xx_serial_resume,
+ .resume_noirq = s3c24xx_serial_resume_noirq,
+};
+#define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
+
+#else /* !CONFIG_PM_SLEEP */
+
+#define SERIAL_SAMSUNG_PM_OPS NULL
+#endif /* CONFIG_PM_SLEEP */
+
+/* Console code */
+
+#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
+
+static struct uart_port *cons_uart;
+
+static int
+s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
+{
+ struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+ unsigned long ufstat, utrstat;
+
+ if (ufcon & S3C2410_UFCON_FIFOMODE) {
+ /* fifo mode - check amount of data in fifo registers... */
+
+ ufstat = rd_regl(port, S3C2410_UFSTAT);
+ return (ufstat & info->tx_fifofull) ? 0 : 1;
+ }
+
+ /* in non-fifo mode, we go and use the tx buffer empty */
+
+ utrstat = rd_regl(port, S3C2410_UTRSTAT);
+ return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
+}
+
+static bool
+s3c24xx_port_configured(unsigned int ucon)
+{
+ /* consider the serial port configured if the tx/rx mode set */
+ return (ucon & 0xf) != 0;
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+/*
+ * Console polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+static int s3c24xx_serial_get_poll_char(struct uart_port *port)
+{
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+ unsigned int ufstat;
+
+ ufstat = rd_regl(port, S3C2410_UFSTAT);
+ if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
+ return NO_POLL_CHAR;
+
+ return rd_regb(port, S3C2410_URXH);
+}
+
+static void s3c24xx_serial_put_poll_char(struct uart_port *port,
+ unsigned char c)
+{
+ unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
+ unsigned int ucon = rd_regl(port, S3C2410_UCON);
+
+ /* not possible to xmit on unconfigured port */
+ if (!s3c24xx_port_configured(ucon))
+ return;
+
+ while (!s3c24xx_serial_console_txrdy(port, ufcon))
+ cpu_relax();
+ wr_regb(port, S3C2410_UTXH, c);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
+static void
+s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
+{
+ unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
+
+ while (!s3c24xx_serial_console_txrdy(port, ufcon))
+ cpu_relax();
+ wr_regb(port, S3C2410_UTXH, ch);
+}
+
+static void
+s3c24xx_serial_console_write(struct console *co, const char *s,
+ unsigned int count)
+{
+ unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
+
+ /* not possible to xmit on unconfigured port */
+ if (!s3c24xx_port_configured(ucon))
+ return;
+
+ uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
+}
+
+static void __init
+s3c24xx_serial_get_options(struct uart_port *port, int *baud,
+ int *parity, int *bits)
+{
+ struct clk *clk;
+ unsigned int ulcon;
+ unsigned int ucon;
+ unsigned int ubrdiv;
+ unsigned long rate;
+ unsigned int clk_sel;
+ char clk_name[MAX_CLK_NAME_LENGTH];
+
+ ulcon = rd_regl(port, S3C2410_ULCON);
+ ucon = rd_regl(port, S3C2410_UCON);
+ ubrdiv = rd_regl(port, S3C2410_UBRDIV);
+
+ dbg("s3c24xx_serial_get_options: port=%p\n"
+ "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
+ port, ulcon, ucon, ubrdiv);
+
+ if (s3c24xx_port_configured(ucon)) {
+ switch (ulcon & S3C2410_LCON_CSMASK) {
+ case S3C2410_LCON_CS5:
+ *bits = 5;
+ break;
+ case S3C2410_LCON_CS6:
+ *bits = 6;
+ break;
+ case S3C2410_LCON_CS7:
+ *bits = 7;
+ break;
+ case S3C2410_LCON_CS8:
+ default:
+ *bits = 8;
+ break;
+ }
+
+ switch (ulcon & S3C2410_LCON_PMASK) {
+ case S3C2410_LCON_PEVEN:
+ *parity = 'e';
+ break;
+
+ case S3C2410_LCON_PODD:
+ *parity = 'o';
+ break;
+
+ case S3C2410_LCON_PNONE:
+ default:
+ *parity = 'n';
+ }
+
+ /* now calculate the baud rate */
+
+ clk_sel = s3c24xx_serial_getsource(port);
+ sprintf(clk_name, "clk_uart_baud%d", clk_sel);
+
+ clk = clk_get(port->dev, clk_name);
+ if (!IS_ERR(clk))
+ rate = clk_get_rate(clk);
+ else
+ rate = 1;
+
+ *baud = rate / (16 * (ubrdiv + 1));
+ dbg("calculated baud %d\n", *baud);
+ }
+
+}
+
+static int __init
+s3c24xx_serial_console_setup(struct console *co, char *options)
+{
+ struct uart_port *port;
+ int baud = 9600;
+ int bits = 8;
+ int parity = 'n';
+ int flow = 'n';
+
+ dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
+ co, co->index, options);
+
+ /* is this a valid port */
+
+ if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
+ co->index = 0;
+
+ port = &s3c24xx_serial_ports[co->index].port;
+
+ /* is the port configured? */
+
+ if (port->mapbase == 0x0)
+ return -ENODEV;
+
+ cons_uart = port;
+
+ dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
+
+ /*
+ * Check whether an invalid uart number has been specified, and
+ * if so, search for the first available port that does have
+ * console support.
+ */
+ if (options)
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+ else
+ s3c24xx_serial_get_options(port, &baud, &parity, &bits);
+
+ dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
+
+ return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct console s3c24xx_serial_console = {
+ .name = S3C24XX_SERIAL_NAME,
+ .device = uart_console_device,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .write = s3c24xx_serial_console_write,
+ .setup = s3c24xx_serial_console_setup,
+ .data = &s3c24xx_uart_drv,
+};
+#endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
+
+#ifdef CONFIG_CPU_S3C2410
+static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
+ .info = &(struct s3c24xx_uart_info) {
+ .name = "Samsung S3C2410 UART",
+ .type = PORT_S3C2410,
+ .fifosize = 16,
+ .rx_fifomask = S3C2410_UFSTAT_RXMASK,
+ .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
+ .rx_fifofull = S3C2410_UFSTAT_RXFULL,
+ .tx_fifofull = S3C2410_UFSTAT_TXFULL,
+ .tx_fifomask = S3C2410_UFSTAT_TXMASK,
+ .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
+ .def_clk_sel = S3C2410_UCON_CLKSEL0,
+ .num_clks = 2,
+ .clksel_mask = S3C2410_UCON_CLKMASK,
+ .clksel_shift = S3C2410_UCON_CLKSHIFT,
+ },
+ .def_cfg = &(struct s3c2410_uartcfg) {
+ .ucon = S3C2410_UCON_DEFAULT,
+ .ufcon = S3C2410_UFCON_DEFAULT,
+ },
+};
+#define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
+#else
+#define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#endif
+
+#ifdef CONFIG_CPU_S3C2412
+static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
+ .info = &(struct s3c24xx_uart_info) {
+ .name = "Samsung S3C2412 UART",
+ .type = PORT_S3C2412,
+ .fifosize = 64,
+ .has_divslot = 1,
+ .rx_fifomask = S3C2440_UFSTAT_RXMASK,
+ .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
+ .rx_fifofull = S3C2440_UFSTAT_RXFULL,
+ .tx_fifofull = S3C2440_UFSTAT_TXFULL,
+ .tx_fifomask = S3C2440_UFSTAT_TXMASK,
+ .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
+ .def_clk_sel = S3C2410_UCON_CLKSEL2,
+ .num_clks = 4,
+ .clksel_mask = S3C2412_UCON_CLKMASK,
+ .clksel_shift = S3C2412_UCON_CLKSHIFT,
+ },
+ .def_cfg = &(struct s3c2410_uartcfg) {
+ .ucon = S3C2410_UCON_DEFAULT,
+ .ufcon = S3C2410_UFCON_DEFAULT,
+ },
+};
+#define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
+#else
+#define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#endif
+
+#if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
+ defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
+static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
+ .info = &(struct s3c24xx_uart_info) {
+ .name = "Samsung S3C2440 UART",
+ .type = PORT_S3C2440,
+ .fifosize = 64,
+ .has_divslot = 1,
+ .rx_fifomask = S3C2440_UFSTAT_RXMASK,
+ .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
+ .rx_fifofull = S3C2440_UFSTAT_RXFULL,
+ .tx_fifofull = S3C2440_UFSTAT_TXFULL,
+ .tx_fifomask = S3C2440_UFSTAT_TXMASK,
+ .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
+ .def_clk_sel = S3C2410_UCON_CLKSEL2,
+ .num_clks = 4,
+ .clksel_mask = S3C2412_UCON_CLKMASK,
+ .clksel_shift = S3C2412_UCON_CLKSHIFT,
+ },
+ .def_cfg = &(struct s3c2410_uartcfg) {
+ .ucon = S3C2410_UCON_DEFAULT,
+ .ufcon = S3C2410_UFCON_DEFAULT,
+ },
+};
+#define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
+#else
+#define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#endif
+
+#if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
+static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
+ .info = &(struct s3c24xx_uart_info) {
+ .name = "Samsung S3C6400 UART",
+ .type = PORT_S3C6400,
+ .fifosize = 64,
+ .has_divslot = 1,
+ .rx_fifomask = S3C2440_UFSTAT_RXMASK,
+ .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
+ .rx_fifofull = S3C2440_UFSTAT_RXFULL,
+ .tx_fifofull = S3C2440_UFSTAT_TXFULL,
+ .tx_fifomask = S3C2440_UFSTAT_TXMASK,
+ .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
+ .def_clk_sel = S3C2410_UCON_CLKSEL2,
+ .num_clks = 4,
+ .clksel_mask = S3C6400_UCON_CLKMASK,
+ .clksel_shift = S3C6400_UCON_CLKSHIFT,
+ },
+ .def_cfg = &(struct s3c2410_uartcfg) {
+ .ucon = S3C2410_UCON_DEFAULT,
+ .ufcon = S3C2410_UFCON_DEFAULT,
+ },
+};
+#define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
+#else
+#define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#endif
+
+#ifdef CONFIG_CPU_S5PV210
+static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
+ .info = &(struct s3c24xx_uart_info) {
+ .name = "Samsung S5PV210 UART",
+ .type = PORT_S3C6400,
+ .has_divslot = 1,
+ .rx_fifomask = S5PV210_UFSTAT_RXMASK,
+ .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
+ .rx_fifofull = S5PV210_UFSTAT_RXFULL,
+ .tx_fifofull = S5PV210_UFSTAT_TXFULL,
+ .tx_fifomask = S5PV210_UFSTAT_TXMASK,
+ .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
+ .def_clk_sel = S3C2410_UCON_CLKSEL0,
+ .num_clks = 2,
+ .clksel_mask = S5PV210_UCON_CLKMASK,
+ .clksel_shift = S5PV210_UCON_CLKSHIFT,
+ },
+ .def_cfg = &(struct s3c2410_uartcfg) {
+ .ucon = S5PV210_UCON_DEFAULT,
+ .ufcon = S5PV210_UFCON_DEFAULT,
+ },
+ .fifosize = { 256, 64, 16, 16 },
+};
+#define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
+#else
+#define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#endif
+
+#if defined(CONFIG_ARCH_EXYNOS)
+#define EXYNOS_COMMON_SERIAL_DRV_DATA \
+ .info = &(struct s3c24xx_uart_info) { \
+ .name = "Samsung Exynos UART", \
+ .type = PORT_S3C6400, \
+ .has_divslot = 1, \
+ .rx_fifomask = S5PV210_UFSTAT_RXMASK, \
+ .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \
+ .rx_fifofull = S5PV210_UFSTAT_RXFULL, \
+ .tx_fifofull = S5PV210_UFSTAT_TXFULL, \
+ .tx_fifomask = S5PV210_UFSTAT_TXMASK, \
+ .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, \
+ .def_clk_sel = S3C2410_UCON_CLKSEL0, \
+ .num_clks = 1, \
+ .clksel_mask = 0, \
+ .clksel_shift = 0, \
+ }, \
+ .def_cfg = &(struct s3c2410_uartcfg) { \
+ .ucon = S5PV210_UCON_DEFAULT, \
+ .ufcon = S5PV210_UFCON_DEFAULT, \
+ .has_fracval = 1, \
+ } \
+
+static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
+ EXYNOS_COMMON_SERIAL_DRV_DATA,
+ .fifosize = { 256, 64, 16, 16 },
+};
+
+static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
+ EXYNOS_COMMON_SERIAL_DRV_DATA,
+ .fifosize = { 64, 256, 16, 256 },
+};
+
+#define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
+#define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data)
+#else
+#define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#define EXYNOS5433_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#endif
+
+static struct platform_device_id s3c24xx_serial_driver_ids[] = {
+ {
+ .name = "s3c2410-uart",
+ .driver_data = S3C2410_SERIAL_DRV_DATA,
+ }, {
+ .name = "s3c2412-uart",
+ .driver_data = S3C2412_SERIAL_DRV_DATA,
+ }, {
+ .name = "s3c2440-uart",
+ .driver_data = S3C2440_SERIAL_DRV_DATA,
+ }, {
+ .name = "s3c6400-uart",
+ .driver_data = S3C6400_SERIAL_DRV_DATA,
+ }, {
+ .name = "s5pv210-uart",
+ .driver_data = S5PV210_SERIAL_DRV_DATA,
+ }, {
+ .name = "exynos4210-uart",
+ .driver_data = EXYNOS4210_SERIAL_DRV_DATA,
+ }, {
+ .name = "exynos5433-uart",
+ .driver_data = EXYNOS5433_SERIAL_DRV_DATA,
+ },
+ { },
+};
+MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id s3c24xx_uart_dt_match[] = {
+ { .compatible = "samsung,s3c2410-uart",
+ .data = (void *)S3C2410_SERIAL_DRV_DATA },
+ { .compatible = "samsung,s3c2412-uart",
+ .data = (void *)S3C2412_SERIAL_DRV_DATA },
+ { .compatible = "samsung,s3c2440-uart",
+ .data = (void *)S3C2440_SERIAL_DRV_DATA },
+ { .compatible = "samsung,s3c6400-uart",
+ .data = (void *)S3C6400_SERIAL_DRV_DATA },
+ { .compatible = "samsung,s5pv210-uart",
+ .data = (void *)S5PV210_SERIAL_DRV_DATA },
+ { .compatible = "samsung,exynos4210-uart",
+ .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
+ { .compatible = "samsung,exynos5433-uart",
+ .data = (void *)EXYNOS5433_SERIAL_DRV_DATA },
+ {},
+};
+MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
+#endif
+
+static struct platform_driver samsung_serial_driver = {
+ .probe = s3c24xx_serial_probe,
+ .remove = s3c24xx_serial_remove,
+ .id_table = s3c24xx_serial_driver_ids,
+ .driver = {
+ .name = "samsung-uart",
+ .pm = SERIAL_SAMSUNG_PM_OPS,
+ .of_match_table = of_match_ptr(s3c24xx_uart_dt_match),
+ },
+};
+
+module_platform_driver(samsung_serial_driver);
+
+#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
+/*
+ * Early console.
+ */
+
+struct samsung_early_console_data {
+ u32 txfull_mask;
+};
+
+static void samsung_early_busyuart(struct uart_port *port)
+{
+ while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
+ ;
+}
+
+static void samsung_early_busyuart_fifo(struct uart_port *port)
+{
+ struct samsung_early_console_data *data = port->private_data;
+
+ while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
+ ;
+}
+
+static void samsung_early_putc(struct uart_port *port, int c)
+{
+ if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
+ samsung_early_busyuart_fifo(port);
+ else
+ samsung_early_busyuart(port);
+
+ writeb(c, port->membase + S3C2410_UTXH);
+}
+
+static void samsung_early_write(struct console *con, const char *s, unsigned n)
+{
+ struct earlycon_device *dev = con->data;
+
+ uart_console_write(&dev->port, s, n, samsung_early_putc);
+}
+
+static int __init samsung_early_console_setup(struct earlycon_device *device,
+ const char *opt)
+{
+ if (!device->port.membase)
+ return -ENODEV;
+
+ device->con->write = samsung_early_write;
+ return 0;
+}
+
+/* S3C2410 */
+static struct samsung_early_console_data s3c2410_early_console_data = {
+ .txfull_mask = S3C2410_UFSTAT_TXFULL,
+};
+
+static int __init s3c2410_early_console_setup(struct earlycon_device *device,
+ const char *opt)
+{
+ device->port.private_data = &s3c2410_early_console_data;
+ return samsung_early_console_setup(device, opt);
+}
+OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart",
+ s3c2410_early_console_setup);
+EARLYCON_DECLARE(s3c2410, s3c2410_early_console_setup);
+
+/* S3C2412, S3C2440, S3C64xx */
+static struct samsung_early_console_data s3c2440_early_console_data = {
+ .txfull_mask = S3C2440_UFSTAT_TXFULL,
+};
+
+static int __init s3c2440_early_console_setup(struct earlycon_device *device,
+ const char *opt)
+{
+ device->port.private_data = &s3c2440_early_console_data;
+ return samsung_early_console_setup(device, opt);
+}
+OF_EARLYCON_DECLARE(s3c2412, "samsung,s3c2412-uart",
+ s3c2440_early_console_setup);
+OF_EARLYCON_DECLARE(s3c2440, "samsung,s3c2440-uart",
+ s3c2440_early_console_setup);
+OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
+ s3c2440_early_console_setup);
+EARLYCON_DECLARE(s3c2412, s3c2440_early_console_setup);
+EARLYCON_DECLARE(s3c2440, s3c2440_early_console_setup);
+EARLYCON_DECLARE(s3c6400, s3c2440_early_console_setup);
+
+/* S5PV210, EXYNOS */
+static struct samsung_early_console_data s5pv210_early_console_data = {
+ .txfull_mask = S5PV210_UFSTAT_TXFULL,
+};
+
+static int __init s5pv210_early_console_setup(struct earlycon_device *device,
+ const char *opt)
+{
+ device->port.private_data = &s5pv210_early_console_data;
+ return samsung_early_console_setup(device, opt);
+}
+OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
+ s5pv210_early_console_setup);
+OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
+ s5pv210_early_console_setup);
+EARLYCON_DECLARE(s5pv210, s5pv210_early_console_setup);
+EARLYCON_DECLARE(exynos4210, s5pv210_early_console_setup);
+#endif
+
+MODULE_ALIAS("platform:samsung-uart");
+MODULE_DESCRIPTION("Samsung SoC Serial port driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff