| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Ben Dooks | 4352 | 39.14% | 7 | 7.14% |
| Robert Baldyga | 2891 | 26.00% | 13 | 13.27% |
| Thomas Abraham | 1894 | 17.03% | 11 | 11.22% |
| Tomasz Figa | 448 | 4.03% | 3 | 3.06% |
| Marek Szyprowski | 374 | 3.36% | 8 | 8.16% |
| Julien Pichon | 174 | 1.56% | 1 | 1.02% |
| Michael Spang | 127 | 1.14% | 2 | 2.04% |
| Joe Perches | 110 | 0.99% | 1 | 1.02% |
| Heiko Stübner | 88 | 0.79% | 2 | 2.04% |
| José Miguel Gonçalves | 73 | 0.66% | 1 | 1.02% |
| Chanwoo Choi | 65 | 0.58% | 2 | 2.04% |
| Chander Kashyap | 60 | 0.54% | 2 | 2.04% |
| Youngmin Nam (남영민) | 57 | 0.51% | 2 | 2.04% |
| Krzysztof Kozlowski | 53 | 0.48% | 6 | 6.12% |
| Tushar Behera | 44 | 0.40% | 2 | 2.04% |
| Naveen Krishna Chatradhi | 38 | 0.34% | 3 | 3.06% |
| Sachin Kamat | 34 | 0.31% | 3 | 3.06% |
| MyungJoo Ham | 28 | 0.25% | 1 | 1.02% |
| Geert Uytterhoeven | 27 | 0.24% | 1 | 1.02% |
| Doug Anderson | 27 | 0.24% | 3 | 3.06% |
| Kyoungil Kim | 26 | 0.23% | 2 | 2.04% |
| Jongpill Lee | 26 | 0.23% | 1 | 1.02% |
| Arnd Bergmann | 23 | 0.21% | 2 | 2.04% |
| Matthew Leach | 15 | 0.13% | 1 | 1.02% |
| Beomho Seo | 13 | 0.12% | 1 | 1.02% |
| Kukjin Kim | 10 | 0.09% | 3 | 3.06% |
| Jingoo Han | 8 | 0.07% | 1 | 1.02% |
| Javier Martinez Canillas | 6 | 0.05% | 1 | 1.02% |
| Mark Brown | 5 | 0.04% | 1 | 1.02% |
| Denis Carikli | 5 | 0.04% | 1 | 1.02% |
| Alan Cox | 4 | 0.04% | 2 | 2.04% |
| Viresh Kumar | 3 | 0.03% | 1 | 1.02% |
| Jiri Slaby | 3 | 0.03% | 1 | 1.02% |
| Greg Kroah-Hartman | 2 | 0.02% | 2 | 2.04% |
| Fabio Estevam | 2 | 0.02% | 1 | 1.02% |
| Lucas De Marchi | 2 | 0.02% | 1 | 1.02% |
| Darius Augulis | 2 | 0.02% | 1 | 1.02% |
| Seung-Woo Kim | 1 | 0.01% | 1 | 1.02% |
| Total | 11120 | 98 |
// SPDX-License-Identifier: GPL-2.0 /* * Driver core for Samsung SoC onboard UARTs. * * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics * http://armlinux.simtec.co.uk/ */ /* 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; struct dma_slave_caps dma_caps; const char *reason = NULL; 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 = 1; 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; dma->tx_conf.dst_maxburst = 1; dma->rx_chan = dma_request_chan(p->port.dev, "rx"); if (IS_ERR(dma->rx_chan)) { reason = "DMA RX channel request failed"; ret = PTR_ERR(dma->rx_chan); goto err_warn; } ret = dma_get_slave_caps(dma->rx_chan, &dma_caps); if (ret < 0 || dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) { reason = "insufficient DMA RX engine capabilities"; ret = -EOPNOTSUPP; goto err_release_rx; } 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)) { reason = "DMA TX channel request failed"; ret = PTR_ERR(dma->tx_chan); goto err_release_rx; } ret = dma_get_slave_caps(dma->tx_chan, &dma_caps); if (ret < 0 || dma_caps.residue_granularity < DMA_RESIDUE_GRANULARITY_BURST) { reason = "insufficient DMA TX engine capabilities"; ret = -EOPNOTSUPP; goto err_release_tx; } 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)) { reason = "DMA mapping error for RX buffer"; 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)) { reason = "DMA mapping error for TX buffer"; 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); err_warn: if (reason) dev_warn(p->port.dev, "%s, DMA will not be used\n", reason); 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) { 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, 3000000); 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); port->status &= ~UPSTAT_AUTOCTS; 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; port->status = UPSTAT_AUTOCTS; } 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); if (index >= ARRAY_SIZE(s3c24xx_serial_ports)) { dev_err(&pdev->dev, "serial%d out of range\n", index); return -EINVAL; } 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); if (!IS_ERR(ourport->baudclk)) clk_prepare_enable(ourport->baudclk); s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port)); if (!IS_ERR(ourport->baudclk)) clk_disable_unprepare(ourport->baudclk); 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); if (!IS_ERR(ourport->baudclk)) clk_prepare_enable(ourport->baudclk); wr_regl(port, S3C64XX_UINTM, uintm); if (!IS_ERR(ourport->baudclk)) clk_disable_unprepare(ourport->baudclk); 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");
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