diff options
Diffstat (limited to 'drivers/tty/serial/samsung.c')
| -rw-r--r-- | drivers/tty/serial/samsung.c | 2519 |
1 files changed, 0 insertions, 2519 deletions
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c deleted file mode 100644 index 8aca18c4cdea..000000000000 --- a/drivers/tty/serial/samsung.c +++ /dev/null @@ -1,2519 +0,0 @@ -/* - * 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(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)) - s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, 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)) - s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, 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)) - s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD, - 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); - - 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 < ourport->min_dma_size || - xmit->tail & (dma_get_cache_alignment() - 1)) - s3c24xx_serial_start_tx_pio(ourport); - else - s3c24xx_serial_start_tx_dma(ourport, count); -} - -static 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 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)) - s3c24xx_set_bit(port, S3C64XX_UINTM_RXD, - 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 void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport); - -static irqreturn_t s3c24xx_serial_rx_chars_dma(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); - } - - s3c24xx_serial_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 void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport) -{ - struct uart_port *port = &ourport->port; - unsigned int ufcon, ch, flag, ufstat, uerstat; - unsigned int fifocnt = 0; - int max_count = port->fifosize; - - while (max_count-- > 0) { - /* - * Receive all characters known to be in FIFO - * before reading FIFO level again - */ - if (fifocnt == 0) { - ufstat = rd_regl(port, S3C2410_UFSTAT); - fifocnt = s3c24xx_serial_rx_fifocnt(ourport, ufstat); - if (fifocnt == 0) - break; - } - fifocnt--; - - 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 = rd_regl(port, S3C2410_UFCON); - ufcon |= S3C2410_UFCON_RESETRX; - wr_regl(port, S3C2410_UFCON, ufcon); - rx_enabled(port) = 1; - return; - } - 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)) - continue; /* Ignore character */ - } - - 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)) - continue; /* Ignore character */ - - uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, - ch, flag); - } - - tty_flip_buffer_push(&port->state->port); -} - -static irqreturn_t s3c24xx_serial_rx_chars_pio(void *dev_id) -{ - struct s3c24xx_uart_port *ourport = dev_id; - struct uart_port *port = &ourport->port; - unsigned long flags; - - spin_lock_irqsave(&port->lock, flags); - s3c24xx_serial_rx_drain_fifo(ourport); - spin_unlock_irqrestore(&port->lock, flags); - - 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(dev_id); - return s3c24xx_serial_rx_chars_pio(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, dma_count = 0; - - 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 >= ourport->min_dma_size) { - int align = dma_get_cache_alignment() - - (xmit->tail & (dma_get_cache_alignment() - 1)); - if (count-align >= ourport->min_dma_size) { - dma_count = count-align; - count = align; - } - } - - 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... */ - - if (count > port->fifosize) { - count = port->fifosize; - dma_count = 0; - } - - 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++; - count--; - } - - if (!count && dma_count) { - s3c24xx_serial_start_tx_dma(ourport, dma_count); - goto out; - } - - 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; - int ret; - - /* 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->rx_chan = dma_request_chan(p->port.dev, "rx"); - - if (IS_ERR(dma->rx_chan)) - return PTR_ERR(dma->rx_chan); - - dmaengine_slave_config(dma->rx_chan, &dma->rx_conf); - - dma->tx_chan = dma_request_chan(p->port.dev, "tx"); - if (IS_ERR(dma->tx_chan)) { - ret = PTR_ERR(dma->tx_chan); - goto err_release_rx; - } - - 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) { - ret = -ENOMEM; - goto err_release_tx; - } - - dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf, - dma->rx_size, DMA_FROM_DEVICE); - if (dma_mapping_error(p->port.dev, dma->rx_addr)) { - ret = -EIO; - goto err_free_rx; - } - - /* TX buffer */ - dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf, - UART_XMIT_SIZE, DMA_TO_DEVICE); - if (dma_mapping_error(p->port.dev, dma->tx_addr)) { - ret = -EIO; - goto err_unmap_rx; - } - - return 0; - -err_unmap_rx: - dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size, - DMA_FROM_DEVICE); -err_free_rx: - kfree(dma->rx_buf); -err_release_tx: - dma_release_channel(dma->tx_chan); -err_release_rx: - dma_release_channel(dma->rx_chan); - return ret; -} - -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(p->port.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(p->port.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, DMA will not be used\n"); - devm_kfree(port->dev, ourport->dma); - ourport->dma = NULL; - } - } - - 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 */ - s3c24xx_clear_bit(port, S3C64XX_UINTM_RXD, 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) { - clk_prepare_enable(clk); - - s3c24xx_serial_setsource(port, clk_sel); - - if (!IS_ERR(ourport->baudclk)) { - clk_disable_unprepare(ourport->baudclk); - ourport->baudclk = ERR_PTR(-EINVAL); - } - - 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_ARM_S3C24XX_CPUFREQ - -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 -EINVAL; - - /* 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) { - ret = -ENOMEM; - goto err; - } - } - - ourport->clk = clk_get(&platdev->dev, "uart"); - if (IS_ERR(ourport->clk)) { - pr_err("%s: Controller clock not found\n", - dev_name(&platdev->dev)); - ret = PTR_ERR(ourport->clk); - goto err; - } - - ret = clk_prepare_enable(ourport->clk); - if (ret) { - pr_err("uart: clock failed to prepare+enable: %d\n", ret); - clk_put(ourport->clk); - goto err; - } - - /* 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; - -err: - port->mapbase = 0; - return ret; -} - -/* 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; - - /* - * DMA transfers must be aligned at least to cache line size, - * so find minimal transfer size suitable for DMA mode - */ - ourport->min_dma_size = max_t(int, ourport->port.fifosize, - dma_get_cache_alignment()); - - 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"); - - probe_index++; - - 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); - struct s3c24xx_uart_port *ourport = to_ourport(port); - - 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; - clk_prepare_enable(ourport->clk); - wr_regl(port, S3C64XX_UINTM, uintm); - clk_disable_unprepare(ourport->clk); - } - } - - 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 const 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); - -/* 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); - -/* 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); -#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"); |