diff options
Diffstat (limited to 'drivers/tty/serial/sh-sci.c')
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 1030 |
1 files changed, 608 insertions, 422 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 75085795528..88236da0ddf 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -23,34 +23,35 @@ #undef DEBUG -#include <linux/module.h> +#include <linux/clk.h> +#include <linux/console.h> +#include <linux/ctype.h> +#include <linux/cpufreq.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> #include <linux/errno.h> -#include <linux/timer.h> +#include <linux/init.h> #include <linux/interrupt.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/serial.h> -#include <linux/major.h> -#include <linux/string.h> -#include <linux/sysrq.h> #include <linux/ioport.h> +#include <linux/major.h> +#include <linux/module.h> #include <linux/mm.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <linux/console.h> -#include <linux/platform_device.h> -#include <linux/serial_sci.h> #include <linux/notifier.h> +#include <linux/of.h> +#include <linux/platform_device.h> #include <linux/pm_runtime.h> -#include <linux/cpufreq.h> -#include <linux/clk.h> -#include <linux/ctype.h> -#include <linux/err.h> -#include <linux/dmaengine.h> -#include <linux/dma-mapping.h> #include <linux/scatterlist.h> +#include <linux/serial.h> +#include <linux/serial_sci.h> +#include <linux/sh_dma.h> #include <linux/slab.h> -#include <linux/gpio.h> +#include <linux/string.h> +#include <linux/sysrq.h> +#include <linux/timer.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> #ifdef CONFIG_SUPERH #include <asm/sh_bios.h> @@ -58,11 +59,32 @@ #include "sh-sci.h" +/* Offsets into the sci_port->irqs array */ +enum { + SCIx_ERI_IRQ, + SCIx_RXI_IRQ, + SCIx_TXI_IRQ, + SCIx_BRI_IRQ, + SCIx_NR_IRQS, + + SCIx_MUX_IRQ = SCIx_NR_IRQS, /* special case */ +}; + +#define SCIx_IRQ_IS_MUXED(port) \ + ((port)->irqs[SCIx_ERI_IRQ] == \ + (port)->irqs[SCIx_RXI_IRQ]) || \ + ((port)->irqs[SCIx_ERI_IRQ] && \ + ((port)->irqs[SCIx_RXI_IRQ] < 0)) + struct sci_port { struct uart_port port; /* Platform configuration */ struct plat_sci_port *cfg; + int overrun_bit; + unsigned int error_mask; + unsigned int sampling_rate; + /* Break timer */ struct timer_list break_timer; @@ -73,8 +95,8 @@ struct sci_port { /* Function clock */ struct clk *fclk; + int irqs[SCIx_NR_IRQS]; char *irqstr[SCIx_NR_IRQS]; - char *gpiostr[SCIx_NR_FNS]; struct dma_chan *chan_tx; struct dma_chan *chan_rx; @@ -98,12 +120,6 @@ struct sci_port { #endif struct notifier_block freq_transition; - -#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE - unsigned short saved_smr; - unsigned short saved_fcr; - unsigned char saved_brr; -#endif }; /* Function prototypes */ @@ -151,6 +167,7 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { [SCRFDR] = sci_reg_invalid, [SCSPTR] = sci_reg_invalid, [SCLSR] = sci_reg_invalid, + [HSSRR] = sci_reg_invalid, }, /* @@ -170,6 +187,7 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { [SCRFDR] = sci_reg_invalid, [SCSPTR] = sci_reg_invalid, [SCLSR] = sci_reg_invalid, + [HSSRR] = sci_reg_invalid, }, /* @@ -188,6 +206,7 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { [SCRFDR] = sci_reg_invalid, [SCSPTR] = sci_reg_invalid, [SCLSR] = sci_reg_invalid, + [HSSRR] = sci_reg_invalid, }, /* @@ -201,11 +220,12 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { [SCxSR] = { 0x14, 16 }, [SCxRDR] = { 0x60, 8 }, [SCFCR] = { 0x18, 16 }, - [SCFDR] = { 0x1c, 16 }, - [SCTFDR] = sci_reg_invalid, - [SCRFDR] = sci_reg_invalid, + [SCFDR] = sci_reg_invalid, + [SCTFDR] = { 0x38, 16 }, + [SCRFDR] = { 0x3c, 16 }, [SCSPTR] = sci_reg_invalid, [SCLSR] = sci_reg_invalid, + [HSSRR] = sci_reg_invalid, }, /* @@ -225,6 +245,7 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { [SCRFDR] = sci_reg_invalid, [SCSPTR] = { 0x20, 16 }, [SCLSR] = { 0x24, 16 }, + [HSSRR] = sci_reg_invalid, }, /* @@ -243,6 +264,7 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { [SCRFDR] = sci_reg_invalid, [SCSPTR] = sci_reg_invalid, [SCLSR] = sci_reg_invalid, + [HSSRR] = sci_reg_invalid, }, /* @@ -261,6 +283,26 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { [SCRFDR] = sci_reg_invalid, [SCSPTR] = { 0x20, 16 }, [SCLSR] = { 0x24, 16 }, + [HSSRR] = sci_reg_invalid, + }, + + /* + * Common HSCIF definitions. + */ + [SCIx_HSCIF_REGTYPE] = { + [SCSMR] = { 0x00, 16 }, + [SCBRR] = { 0x04, 8 }, + [SCSCR] = { 0x08, 16 }, + [SCxTDR] = { 0x0c, 8 }, + [SCxSR] = { 0x10, 16 }, + [SCxRDR] = { 0x14, 8 }, + [SCFCR] = { 0x18, 16 }, + [SCFDR] = { 0x1c, 16 }, + [SCTFDR] = sci_reg_invalid, + [SCRFDR] = sci_reg_invalid, + [SCSPTR] = { 0x20, 16 }, + [SCLSR] = { 0x24, 16 }, + [HSSRR] = { 0x40, 16 }, }, /* @@ -280,6 +322,7 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { [SCRFDR] = sci_reg_invalid, [SCSPTR] = sci_reg_invalid, [SCLSR] = { 0x24, 16 }, + [HSSRR] = sci_reg_invalid, }, /* @@ -299,6 +342,7 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { [SCRFDR] = { 0x20, 16 }, [SCSPTR] = { 0x24, 16 }, [SCLSR] = { 0x28, 16 }, + [HSSRR] = sci_reg_invalid, }, /* @@ -318,6 +362,7 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = { [SCRFDR] = sci_reg_invalid, [SCSPTR] = sci_reg_invalid, [SCLSR] = sci_reg_invalid, + [HSSRR] = sci_reg_invalid, }, }; @@ -355,9 +400,6 @@ static void sci_serial_out(struct uart_port *p, int offset, int value) WARN(1, "Invalid register access\n"); } -#define sci_in(up, offset) (up->serial_in(up, offset)) -#define sci_out(up, offset, value) (up->serial_out(up, offset, value)) - static int sci_probe_regmap(struct plat_sci_port *cfg) { switch (cfg->type) { @@ -382,8 +424,11 @@ static int sci_probe_regmap(struct plat_sci_port *cfg) */ cfg->regtype = SCIx_SH4_SCIF_REGTYPE; break; + case PORT_HSCIF: + cfg->regtype = SCIx_HSCIF_REGTYPE; + break; default: - printk(KERN_ERR "Can't probe register map for given port\n"); + pr_err("Can't probe register map for given port\n"); return -EINVAL; } @@ -397,9 +442,9 @@ static void sci_port_enable(struct sci_port *sci_port) pm_runtime_get_sync(sci_port->port.dev); - clk_enable(sci_port->iclk); + clk_prepare_enable(sci_port->iclk); sci_port->port.uartclk = clk_get_rate(sci_port->iclk); - clk_enable(sci_port->fclk); + clk_prepare_enable(sci_port->fclk); } static void sci_port_disable(struct sci_port *sci_port) @@ -407,8 +452,16 @@ static void sci_port_disable(struct sci_port *sci_port) if (!sci_port->port.dev) return; - clk_disable(sci_port->fclk); - clk_disable(sci_port->iclk); + /* Cancel the break timer to ensure that the timer handler will not try + * to access the hardware with clocks and power disabled. Reset the + * break flag to make the break debouncing state machine ready for the + * next break. + */ + del_timer_sync(&sci_port->break_timer); + sci_port->break_flag = 0; + + clk_disable_unprepare(sci_port->fclk); + clk_disable_unprepare(sci_port->iclk); pm_runtime_put_sync(sci_port->port.dev); } @@ -422,9 +475,9 @@ static int sci_poll_get_char(struct uart_port *port) int c; do { - status = sci_in(port, SCxSR); + status = serial_port_in(port, SCxSR); if (status & SCxSR_ERRORS(port)) { - sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); + serial_port_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); continue; } break; @@ -433,11 +486,11 @@ static int sci_poll_get_char(struct uart_port *port) if (!(status & SCxSR_RDxF(port))) return NO_POLL_CHAR; - c = sci_in(port, SCxRDR); + c = serial_port_in(port, SCxRDR); /* Dummy read */ - sci_in(port, SCxSR); - sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); + serial_port_in(port, SCxSR); + serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); return c; } @@ -448,11 +501,11 @@ static void sci_poll_put_char(struct uart_port *port, unsigned char c) unsigned short status; do { - status = sci_in(port, SCxSR); + status = serial_port_in(port, SCxSR); } while (!(status & SCxSR_TDxE(port))); - sci_out(port, SCxTDR, c); - sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port)); + serial_port_out(port, SCxTDR, c); + serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port)); } #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */ @@ -480,10 +533,10 @@ static void sci_init_pins(struct uart_port *port, unsigned int cflag) ((!(cflag & CRTSCTS)))) { unsigned short status; - status = sci_in(port, SCSPTR); + status = serial_port_in(port, SCSPTR); status &= ~SCSPTR_CTSIO; status |= SCSPTR_RTSIO; - sci_out(port, SCSPTR, status); /* Set RTS = 1 */ + serial_port_out(port, SCSPTR, status); /* Set RTS = 1 */ } } @@ -493,13 +546,13 @@ static int sci_txfill(struct uart_port *port) reg = sci_getreg(port, SCTFDR); if (reg->size) - return sci_in(port, SCTFDR) & 0xff; + return serial_port_in(port, SCTFDR) & ((port->fifosize << 1) - 1); reg = sci_getreg(port, SCFDR); if (reg->size) - return sci_in(port, SCFDR) >> 8; + return serial_port_in(port, SCFDR) >> 8; - return !(sci_in(port, SCxSR) & SCI_TDRE); + return !(serial_port_in(port, SCxSR) & SCI_TDRE); } static int sci_txroom(struct uart_port *port) @@ -513,13 +566,13 @@ static int sci_rxfill(struct uart_port *port) reg = sci_getreg(port, SCRFDR); if (reg->size) - return sci_in(port, SCRFDR) & 0xff; + return serial_port_in(port, SCRFDR) & ((port->fifosize << 1) - 1); reg = sci_getreg(port, SCFDR); if (reg->size) - return sci_in(port, SCFDR) & ((port->fifosize << 1) - 1); + return serial_port_in(port, SCFDR) & ((port->fifosize << 1) - 1); - return (sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0; + return (serial_port_in(port, SCxSR) & SCxSR_RDxF(port)) != 0; } /* @@ -532,7 +585,8 @@ static inline int sci_rxd_in(struct uart_port *port) if (s->cfg->port_reg <= 0) return 1; - return !!__raw_readb(s->cfg->port_reg); + /* Cast for ARM damage */ + return !!__raw_readb((void __iomem *)(uintptr_t)s->cfg->port_reg); } /* ********************************************************************** * @@ -547,14 +601,14 @@ static void sci_transmit_chars(struct uart_port *port) unsigned short ctrl; int count; - status = sci_in(port, SCxSR); + status = serial_port_in(port, SCxSR); if (!(status & SCxSR_TDxE(port))) { - ctrl = sci_in(port, SCSCR); + ctrl = serial_port_in(port, SCSCR); if (uart_circ_empty(xmit)) ctrl &= ~SCSCR_TIE; else ctrl |= SCSCR_TIE; - sci_out(port, SCSCR, ctrl); + serial_port_out(port, SCSCR, ctrl); return; } @@ -573,27 +627,27 @@ static void sci_transmit_chars(struct uart_port *port) break; } - sci_out(port, SCxTDR, c); + serial_port_out(port, SCxTDR, c); port->icount.tx++; } while (--count > 0); - sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); + serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port); if (uart_circ_empty(xmit)) { sci_stop_tx(port); } else { - ctrl = sci_in(port, SCSCR); + ctrl = serial_port_in(port, SCSCR); if (port->type != PORT_SCI) { - sci_in(port, SCxSR); /* Dummy read */ - sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); + serial_port_in(port, SCxSR); /* Dummy read */ + serial_port_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); } ctrl |= SCSCR_TIE; - sci_out(port, SCSCR, ctrl); + serial_port_out(port, SCSCR, ctrl); } } @@ -603,35 +657,35 @@ static void sci_transmit_chars(struct uart_port *port) static void sci_receive_chars(struct uart_port *port) { struct sci_port *sci_port = to_sci_port(port); - struct tty_struct *tty = port->state->port.tty; + struct tty_port *tport = &port->state->port; int i, count, copied = 0; unsigned short status; unsigned char flag; - status = sci_in(port, SCxSR); + status = serial_port_in(port, SCxSR); if (!(status & SCxSR_RDxF(port))) return; while (1) { /* Don't copy more bytes than there is room for in the buffer */ - count = tty_buffer_request_room(tty, sci_rxfill(port)); + count = tty_buffer_request_room(tport, sci_rxfill(port)); /* If for any reason we can't copy more data, we're done! */ if (count == 0) break; if (port->type == PORT_SCI) { - char c = sci_in(port, SCxRDR); + char c = serial_port_in(port, SCxRDR); if (uart_handle_sysrq_char(port, c) || sci_port->break_flag) count = 0; else - tty_insert_flip_char(tty, c, TTY_NORMAL); + tty_insert_flip_char(tport, c, TTY_NORMAL); } else { for (i = 0; i < count; i++) { - char c = sci_in(port, SCxRDR); + char c = serial_port_in(port, SCxRDR); - status = sci_in(port, SCxSR); + status = serial_port_in(port, SCxSR); #if defined(CONFIG_CPU_SH3) /* Skip "chars" during break */ if (sci_port->break_flag) { @@ -668,12 +722,12 @@ static void sci_receive_chars(struct uart_port *port) } else flag = TTY_NORMAL; - tty_insert_flip_char(tty, c, flag); + tty_insert_flip_char(tport, c, flag); } } - sci_in(port, SCxSR); /* dummy read */ - sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); + serial_port_in(port, SCxSR); /* dummy read */ + serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); copied += count; port->icount.rx += count; @@ -681,10 +735,10 @@ static void sci_receive_chars(struct uart_port *port) if (copied) { /* Tell the rest of the system the news. New characters! */ - tty_flip_buffer_push(tty); + tty_flip_buffer_push(tport); } else { - sci_in(port, SCxSR); /* dummy read */ - sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); + serial_port_in(port, SCxSR); /* dummy read */ + serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); } } @@ -708,8 +762,6 @@ static void sci_break_timer(unsigned long data) { struct sci_port *port = (struct sci_port *)data; - sci_port_enable(port); - if (sci_rxd_in(&port->port) == 0) { port->break_flag = 1; sci_schedule_break_timer(port); @@ -719,30 +771,24 @@ static void sci_break_timer(unsigned long data) sci_schedule_break_timer(port); } else port->break_flag = 0; - - sci_port_disable(port); } static int sci_handle_errors(struct uart_port *port) { int copied = 0; - unsigned short status = sci_in(port, SCxSR); - struct tty_struct *tty = port->state->port.tty; + unsigned short status = serial_port_in(port, SCxSR); + struct tty_port *tport = &port->state->port; struct sci_port *s = to_sci_port(port); - /* - * Handle overruns, if supported. - */ - if (s->cfg->overrun_bit != SCIx_NOT_SUPPORTED) { - if (status & (1 << s->cfg->overrun_bit)) { - port->icount.overrun++; + /* Handle overruns */ + if (status & (1 << s->overrun_bit)) { + port->icount.overrun++; - /* overrun error */ - if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) - copied++; + /* overrun error */ + if (tty_insert_flip_char(tport, 0, TTY_OVERRUN)) + copied++; - dev_notice(port->dev, "overrun error"); - } + dev_notice(port->dev, "overrun error\n"); } if (status & SCxSR_FER(port)) { @@ -762,7 +808,7 @@ static int sci_handle_errors(struct uart_port *port) dev_dbg(port->dev, "BREAK detected\n"); - if (tty_insert_flip_char(tty, 0, TTY_BREAK)) + if (tty_insert_flip_char(tport, 0, TTY_BREAK)) copied++; } @@ -770,7 +816,7 @@ static int sci_handle_errors(struct uart_port *port) /* frame error */ port->icount.frame++; - if (tty_insert_flip_char(tty, 0, TTY_FRAME)) + if (tty_insert_flip_char(tport, 0, TTY_FRAME)) copied++; dev_notice(port->dev, "frame error\n"); @@ -781,21 +827,21 @@ static int sci_handle_errors(struct uart_port *port) /* parity error */ port->icount.parity++; - if (tty_insert_flip_char(tty, 0, TTY_PARITY)) + if (tty_insert_flip_char(tport, 0, TTY_PARITY)) copied++; - dev_notice(port->dev, "parity error"); + dev_notice(port->dev, "parity error\n"); } if (copied) - tty_flip_buffer_push(tty); + tty_flip_buffer_push(tport); return copied; } static int sci_handle_fifo_overrun(struct uart_port *port) { - struct tty_struct *tty = port->state->port.tty; + struct tty_port *tport = &port->state->port; struct sci_port *s = to_sci_port(port); struct plat_sci_reg *reg; int copied = 0; @@ -804,13 +850,13 @@ static int sci_handle_fifo_overrun(struct uart_port *port) if (!reg->size) return 0; - if ((sci_in(port, SCLSR) & (1 << s->cfg->overrun_bit))) { - sci_out(port, SCLSR, 0); + if ((serial_port_in(port, SCLSR) & (1 << s->overrun_bit))) { + serial_port_out(port, SCLSR, 0); port->icount.overrun++; - tty_insert_flip_char(tty, 0, TTY_OVERRUN); - tty_flip_buffer_push(tty); + tty_insert_flip_char(tport, 0, TTY_OVERRUN); + tty_flip_buffer_push(tport); dev_notice(port->dev, "overrun error\n"); copied++; @@ -822,8 +868,8 @@ static int sci_handle_fifo_overrun(struct uart_port *port) static int sci_handle_breaks(struct uart_port *port) { int copied = 0; - unsigned short status = sci_in(port, SCxSR); - struct tty_struct *tty = port->state->port.tty; + unsigned short status = serial_port_in(port, SCxSR); + struct tty_port *tport = &port->state->port; struct sci_port *s = to_sci_port(port); if (uart_handle_break(port)) @@ -838,14 +884,14 @@ static int sci_handle_breaks(struct uart_port *port) port->icount.brk++; /* Notify of BREAK */ - if (tty_insert_flip_char(tty, 0, TTY_BREAK)) + if (tty_insert_flip_char(tport, 0, TTY_BREAK)) copied++; dev_dbg(port->dev, "BREAK detected\n"); } if (copied) - tty_flip_buffer_push(tty); + tty_flip_buffer_push(tport); copied += sci_handle_fifo_overrun(port); @@ -859,19 +905,19 @@ static irqreturn_t sci_rx_interrupt(int irq, void *ptr) struct sci_port *s = to_sci_port(port); if (s->chan_rx) { - u16 scr = sci_in(port, SCSCR); - u16 ssr = sci_in(port, SCxSR); + u16 scr = serial_port_in(port, SCSCR); + u16 ssr = serial_port_in(port, SCxSR); /* Disable future Rx interrupts */ if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { disable_irq_nosync(irq); - scr |= 0x4000; + scr |= SCSCR_RDRQE; } else { scr &= ~SCSCR_RIE; } - sci_out(port, SCSCR, scr); + serial_port_out(port, SCSCR, scr); /* Clear current interrupt */ - sci_out(port, SCxSR, ssr & ~(1 | SCxSR_RDxF(port))); + serial_port_out(port, SCxSR, ssr & ~(1 | SCxSR_RDxF(port))); dev_dbg(port->dev, "Rx IRQ %lu: setup t-out in %u jiffies\n", jiffies, s->rx_timeout); mod_timer(&s->rx_timer, jiffies + s->rx_timeout); @@ -909,15 +955,15 @@ static irqreturn_t sci_er_interrupt(int irq, void *ptr) if (port->type == PORT_SCI) { if (sci_handle_errors(port)) { /* discard character in rx buffer */ - sci_in(port, SCxSR); - sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); + serial_port_in(port, SCxSR); + serial_port_out(port, SCxSR, SCxSR_RDxF_CLEAR(port)); } } else { sci_handle_fifo_overrun(port); sci_rx_interrupt(irq, ptr); } - sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); + serial_port_out(port, SCxSR, SCxSR_ERROR_CLEAR(port)); /* Kick the transmission */ sci_tx_interrupt(irq, ptr); @@ -931,7 +977,7 @@ static irqreturn_t sci_br_interrupt(int irq, void *ptr) /* Handle BREAKs */ sci_handle_breaks(port); - sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port)); + serial_port_out(port, SCxSR, SCxSR_BREAK_CLEAR(port)); return IRQ_HANDLED; } @@ -955,8 +1001,8 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) struct sci_port *s = to_sci_port(port); irqreturn_t ret = IRQ_NONE; - ssr_status = sci_in(port, SCxSR); - scr_status = sci_in(port, SCSCR); + ssr_status = serial_port_in(port, SCxSR); + scr_status = serial_port_in(port, SCSCR); err_enabled = scr_status & port_rx_irq_mask(port); /* Tx Interrupt */ @@ -995,8 +1041,7 @@ static int sci_notifier(struct notifier_block *self, sci_port = container_of(self, struct sci_port, freq_transition); - if ((phase == CPUFREQ_POSTCHANGE) || - (phase == CPUFREQ_RESUMECHANGE)) { + if (phase == CPUFREQ_POSTCHANGE) { struct uart_port *port = &sci_port->port; spin_lock_irqsave(&port->lock, flags); @@ -1050,13 +1095,21 @@ static int sci_request_irq(struct sci_port *port) for (i = j = 0; i < SCIx_NR_IRQS; i++, j++) { struct sci_irq_desc *desc; - unsigned int irq; + int irq; if (SCIx_IRQ_IS_MUXED(port)) { i = SCIx_MUX_IRQ; irq = up->irq; - } else - irq = port->cfg->irqs[i]; + } else { + irq = port->irqs[i]; + + /* + * Certain port types won't support all of the + * available interrupt sources. + */ + if (unlikely(irq < 0)) + continue; + } desc = sci_irq_desc + i; port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s", @@ -1079,7 +1132,7 @@ static int sci_request_irq(struct sci_port *port) out_noirq: while (--i >= 0) - free_irq(port->cfg->irqs[i], port); + free_irq(port->irqs[i], port); out_nomem: while (--j >= 0) @@ -1097,80 +1150,28 @@ static void sci_free_irq(struct sci_port *port) * IRQ first. */ for (i = 0; i < SCIx_NR_IRQS; i++) { - free_irq(port->cfg->irqs[i], port); - kfree(port->irqstr[i]); - - if (SCIx_IRQ_IS_MUXED(port)) { - /* If there's only one IRQ, we're done. */ - return; - } - } -} - -static const char *sci_gpio_names[SCIx_NR_FNS] = { - "sck", "rxd", "txd", "cts", "rts", -}; - -static const char *sci_gpio_str(unsigned int index) -{ - return sci_gpio_names[index]; -} - -static void __devinit sci_init_gpios(struct sci_port *port) -{ - struct uart_port *up = &port->port; - int i; - - if (!port->cfg) - return; - - for (i = 0; i < SCIx_NR_FNS; i++) { - const char *desc; - int ret; - - if (!port->cfg->gpios[i]) - continue; - - desc = sci_gpio_str(i); - - port->gpiostr[i] = kasprintf(GFP_KERNEL, "%s:%s", - dev_name(up->dev), desc); + int irq = port->irqs[i]; /* - * If we've failed the allocation, we can still continue - * on with a NULL string. + * Certain port types won't support all of the available + * interrupt sources. */ - if (!port->gpiostr[i]) - dev_notice(up->dev, "%s string allocation failure\n", - desc); + if (unlikely(irq < 0)) + continue; - ret = gpio_request(port->cfg->gpios[i], port->gpiostr[i]); - if (unlikely(ret != 0)) { - dev_notice(up->dev, "failed %s gpio request\n", desc); + free_irq(port->irqs[i], port); + kfree(port->irqstr[i]); - /* - * If we can't get the GPIO for whatever reason, - * no point in keeping the verbose string around. - */ - kfree(port->gpiostr[i]); + if (SCIx_IRQ_IS_MUXED(port)) { + /* If there's only one IRQ, we're done. */ + return; } } } -static void sci_free_gpios(struct sci_port *port) -{ - int i; - - for (i = 0; i < SCIx_NR_FNS; i++) - if (port->cfg->gpios[i]) { - gpio_free(port->cfg->gpios[i]); - kfree(port->gpiostr[i]); - } -} - static unsigned int sci_tx_empty(struct uart_port *port) { - unsigned short status = sci_in(port, SCxSR); + unsigned short status = serial_port_in(port, SCxSR); unsigned short in_tx_fifo = sci_txfill(port); return (status & SCxSR_TEND(port)) && !in_tx_fifo ? TIOCSER_TEMT : 0; @@ -1198,7 +1199,9 @@ static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl) */ reg = sci_getreg(port, SCFCR); if (reg->size) - sci_out(port, SCFCR, sci_in(port, SCFCR) | 1); + serial_port_out(port, SCFCR, + serial_port_in(port, SCFCR) | + SCFCR_LOOP); } } @@ -1229,30 +1232,33 @@ static void sci_dma_tx_complete(void *arg) port->icount.tx += sg_dma_len(&s->sg_tx); async_tx_ack(s->desc_tx); - s->cookie_tx = -EINVAL; s->desc_tx = NULL; if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port); if (!uart_circ_empty(xmit)) { + s->cookie_tx = 0; schedule_work(&s->work_tx); - } else if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { - u16 ctrl = sci_in(port, SCSCR); - sci_out(port, SCSCR, ctrl & ~SCSCR_TIE); + } else { + s->cookie_tx = -EINVAL; + if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { + u16 ctrl = serial_port_in(port, SCSCR); + serial_port_out(port, SCSCR, ctrl & ~SCSCR_TIE); + } } spin_unlock_irqrestore(&port->lock, flags); } /* Locking: called with port lock held */ -static int sci_dma_rx_push(struct sci_port *s, struct tty_struct *tty, - size_t count) +static int sci_dma_rx_push(struct sci_port *s, size_t count) { struct uart_port *port = &s->port; + struct tty_port *tport = &port->state->port; int i, active, room; - room = tty_buffer_request_room(tty, count); + room = tty_buffer_request_room(tport, count); if (s->active_rx == s->cookie_rx[0]) { active = 0; @@ -1264,13 +1270,13 @@ static int sci_dma_rx_push(struct sci_port *s, struct tty_struct *tty, } if (room < count) - dev_warn(port->dev, "Rx overrun: dropping %u bytes\n", + dev_warn(port->dev, "Rx overrun: dropping %zu bytes\n", count - room); if (!room) return room; for (i = 0; i < room; i++) - tty_insert_flip_char(tty, ((u8 *)sg_virt(&s->sg_rx[active]))[i], + tty_insert_flip_char(tport, ((u8 *)sg_virt(&s->sg_rx[active]))[i], TTY_NORMAL); port->icount.rx += room; @@ -1282,22 +1288,22 @@ static void sci_dma_rx_complete(void *arg) { struct sci_port *s = arg; struct uart_port *port = &s->port; - struct tty_struct *tty = port->state->port.tty; unsigned long flags; int count; - dev_dbg(port->dev, "%s(%d) active #%d\n", __func__, port->line, s->active_rx); + dev_dbg(port->dev, "%s(%d) active #%d\n", + __func__, port->line, s->active_rx); spin_lock_irqsave(&port->lock, flags); - count = sci_dma_rx_push(s, tty, s->buf_len_rx); + count = sci_dma_rx_push(s, s->buf_len_rx); mod_timer(&s->rx_timer, jiffies + s->rx_timeout); spin_unlock_irqrestore(&port->lock, flags); if (count) - tty_flip_buffer_push(tty); + tty_flip_buffer_push(&port->state->port); schedule_work(&s->work_rx); } @@ -1338,7 +1344,7 @@ static void sci_submit_rx(struct sci_port *s) struct scatterlist *sg = &s->sg_rx[i]; struct dma_async_tx_descriptor *desc; - desc = chan->device->device_prep_slave_sg(chan, + desc = dmaengine_prep_slave_sg(chan, sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); if (desc) { @@ -1362,8 +1368,8 @@ static void sci_submit_rx(struct sci_port *s) sci_rx_dma_release(s, true); return; } - dev_dbg(s->port.dev, "%s(): cookie %d to #%d\n", __func__, - s->cookie_rx[i], i); + dev_dbg(s->port.dev, "%s(): cookie %d to #%d\n", + __func__, s->cookie_rx[i], i); } s->active_rx = s->cookie_rx[0]; @@ -1389,25 +1395,24 @@ static void work_fn_rx(struct work_struct *work) desc = s->desc_rx[new]; if (dma_async_is_tx_complete(s->chan_rx, s->active_rx, NULL, NULL) != - DMA_SUCCESS) { + DMA_COMPLETE) { /* Handle incomplete DMA receive */ - struct tty_struct *tty = port->state->port.tty; struct dma_chan *chan = s->chan_rx; - struct sh_desc *sh_desc = container_of(desc, struct sh_desc, - async_tx); + struct shdma_desc *sh_desc = container_of(desc, + struct shdma_desc, async_tx); unsigned long flags; int count; chan->device->device_control(chan, DMA_TERMINATE_ALL, 0); - dev_dbg(port->dev, "Read %u bytes with cookie %d\n", + dev_dbg(port->dev, "Read %zu bytes with cookie %d\n", sh_desc->partial, sh_desc->cookie); spin_lock_irqsave(&port->lock, flags); - count = sci_dma_rx_push(s, tty, sh_desc->partial); + count = sci_dma_rx_push(s, sh_desc->partial); spin_unlock_irqrestore(&port->lock, flags); if (count) - tty_flip_buffer_push(tty); + tty_flip_buffer_push(&port->state->port); sci_submit_rx(s); @@ -1423,8 +1428,8 @@ static void work_fn_rx(struct work_struct *work) s->active_rx = s->cookie_rx[!new]; - dev_dbg(port->dev, "%s: cookie %d #%d, new active #%d\n", __func__, - s->cookie_rx[new], new, s->active_rx); + dev_dbg(port->dev, "%s: cookie %d #%d, new active #%d\n", + __func__, s->cookie_rx[new], new, s->active_rx); } static void work_fn_tx(struct work_struct *work) @@ -1453,7 +1458,7 @@ static void work_fn_tx(struct work_struct *work) BUG_ON(!sg_dma_len(sg)); - desc = chan->device->device_prep_slave_sg(chan, + desc = dmaengine_prep_slave_sg(chan, sg, s->sg_len_tx, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { @@ -1477,8 +1482,8 @@ static void work_fn_tx(struct work_struct *work) return; } - dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", __func__, - xmit->buf, xmit->tail, xmit->head, s->cookie_tx); + dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", + __func__, xmit->buf, xmit->tail, xmit->head, s->cookie_tx); dma_async_issue_pending(chan); } @@ -1491,24 +1496,26 @@ static void sci_start_tx(struct uart_port *port) #ifdef CONFIG_SERIAL_SH_SCI_DMA if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { - u16 new, scr = sci_in(port, SCSCR); + u16 new, scr = serial_port_in(port, SCSCR); if (s->chan_tx) - new = scr | 0x8000; + new = scr | SCSCR_TDRQE; else - new = scr & ~0x8000; + new = scr & ~SCSCR_TDRQE; if (new != scr) - sci_out(port, SCSCR, new); + serial_port_out(port, SCSCR, new); } if (s->chan_tx && !uart_circ_empty(&s->port.state->xmit) && - s->cookie_tx < 0) + s->cookie_tx < 0) { + s->cookie_tx = 0; schedule_work(&s->work_tx); + } #endif if (!s->chan_tx || port->type == PORT_SCIFA || port->type == PORT_SCIFB) { /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */ - ctrl = sci_in(port, SCSCR); - sci_out(port, SCSCR, ctrl | SCSCR_TIE); + ctrl = serial_port_in(port, SCSCR); + serial_port_out(port, SCSCR, ctrl | SCSCR_TIE); } } @@ -1517,40 +1524,40 @@ static void sci_stop_tx(struct uart_port *port) unsigned short ctrl; /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */ - ctrl = sci_in(port, SCSCR); + ctrl = serial_port_in(port, SCSCR); if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) - ctrl &= ~0x8000; + ctrl &= ~SCSCR_TDRQE; ctrl &= ~SCSCR_TIE; - sci_out(port, SCSCR, ctrl); + serial_port_out(port, SCSCR, ctrl); } static void sci_start_rx(struct uart_port *port) { unsigned short ctrl; - ctrl = sci_in(port, SCSCR) | port_rx_irq_mask(port); + ctrl = serial_port_in(port, SCSCR) | port_rx_irq_mask(port); if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) - ctrl &= ~0x4000; + ctrl &= ~SCSCR_RDRQE; - sci_out(port, SCSCR, ctrl); + serial_port_out(port, SCSCR, ctrl); } static void sci_stop_rx(struct uart_port *port) { unsigned short ctrl; - ctrl = sci_in(port, SCSCR); + ctrl = serial_port_in(port, SCSCR); if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) - ctrl &= ~0x4000; + ctrl &= ~SCSCR_RDRQE; ctrl &= ~port_rx_irq_mask(port); - sci_out(port, SCSCR, ctrl); + serial_port_out(port, SCSCR, ctrl); } static void sci_enable_ms(struct uart_port *port) @@ -1562,10 +1569,32 @@ static void sci_enable_ms(struct uart_port *port) static void sci_break_ctl(struct uart_port *port, int break_state) { - /* - * Not supported by hardware. Most parts couple break and rx - * interrupts together, with break detection always enabled. - */ + struct sci_port *s = to_sci_port(port); + struct plat_sci_reg *reg = sci_regmap[s->cfg->regtype] + SCSPTR; + unsigned short scscr, scsptr; + + /* check wheter the port has SCSPTR */ + if (!reg->size) { + /* + * Not supported by hardware. Most parts couple break and rx + * interrupts together, with break detection always enabled. + */ + return; + } + + scsptr = serial_port_in(port, SCSPTR); + scscr = serial_port_in(port, SCSCR); + + if (break_state == -1) { + scsptr = (scsptr | SCSPTR_SPB2IO) & ~SCSPTR_SPB2DT; + scscr &= ~SCSCR_TE; + } else { + scsptr = (scsptr | SCSPTR_SPB2DT) & ~SCSPTR_SPB2IO; + scscr |= SCSCR_TE; + } + + serial_port_out(port, SCSPTR, scsptr); + serial_port_out(port, SCSCR, scscr); } #ifdef CONFIG_SERIAL_SH_SCI_DMA @@ -1573,10 +1602,10 @@ static bool filter(struct dma_chan *chan, void *slave) { struct sh_dmae_slave *param = slave; - dev_dbg(chan->device->dev, "%s: slave ID %d\n", __func__, - param->slave_id); + dev_dbg(chan->device->dev, "%s: slave ID %d\n", + __func__, param->shdma_slave.slave_id); - chan->private = param; + chan->private = ¶m->shdma_slave; return true; } @@ -1584,13 +1613,13 @@ static void rx_timer_fn(unsigned long arg) { struct sci_port *s = (struct sci_port *)arg; struct uart_port *port = &s->port; - u16 scr = sci_in(port, SCSCR); + u16 scr = serial_port_in(port, SCSCR); if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) { - scr &= ~0x4000; - enable_irq(s->cfg->irqs[1]); + scr &= ~SCSCR_RDRQE; + enable_irq(s->irqs[SCIx_RXI_IRQ]); } - sci_out(port, SCSCR, scr | SCSCR_RIE); + serial_port_out(port, SCSCR, scr | SCSCR_RIE); dev_dbg(port->dev, "DMA Rx timed out\n"); schedule_work(&s->work_rx); } @@ -1603,8 +1632,7 @@ static void sci_request_dma(struct uart_port *port) dma_cap_mask_t mask; int nent; - dev_dbg(port->dev, "%s: port %d\n", __func__, - port->line); + dev_dbg(port->dev, "%s: port %d\n", __func__, port->line); if (s->cfg->dma_slave_tx <= 0 || s->cfg->dma_slave_rx <= 0) return; @@ -1615,7 +1643,7 @@ static void sci_request_dma(struct uart_port *port) param = &s->param_tx; /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_TX */ - param->slave_id = s->cfg->dma_slave_tx; + param->shdma_slave.slave_id = s->cfg->dma_slave_tx; s->cookie_tx = -EINVAL; chan = dma_request_channel(mask, filter, param); @@ -1624,16 +1652,18 @@ static void sci_request_dma(struct uart_port *port) s->chan_tx = chan; sg_init_table(&s->sg_tx, 1); /* UART circular tx buffer is an aligned page. */ - BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK); + BUG_ON((uintptr_t)port->state->xmit.buf & ~PAGE_MASK); sg_set_page(&s->sg_tx, virt_to_page(port->state->xmit.buf), - UART_XMIT_SIZE, (int)port->state->xmit.buf & ~PAGE_MASK); + UART_XMIT_SIZE, + (uintptr_t)port->state->xmit.buf & ~PAGE_MASK); nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE); if (!nent) sci_tx_dma_release(s, false); else - dev_dbg(port->dev, "%s: mapped %d@%p to %x\n", __func__, - sg_dma_len(&s->sg_tx), - port->state->xmit.buf, sg_dma_address(&s->sg_tx)); + dev_dbg(port->dev, "%s: mapped %d@%p to %pad\n", + __func__, + sg_dma_len(&s->sg_tx), port->state->xmit.buf, + &sg_dma_address(&s->sg_tx)); s->sg_len_tx = nent; @@ -1643,7 +1673,7 @@ static void sci_request_dma(struct uart_port *port) param = &s->param_rx; /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_RX */ - param->slave_id = s->cfg->dma_slave_rx; + param->shdma_slave.slave_id = s->cfg->dma_slave_rx; chan = dma_request_channel(mask, filter, param); dev_dbg(port->dev, "%s: RX: got channel %p\n", __func__, chan); @@ -1673,7 +1703,7 @@ static void sci_request_dma(struct uart_port *port) sg_init_table(sg, 1); sg_set_page(sg, virt_to_page(buf[i]), s->buf_len_rx, - (int)buf[i] & ~PAGE_MASK); + (uintptr_t)buf[i] & ~PAGE_MASK); sg_dma_address(sg) = dma[i]; } @@ -1706,20 +1736,21 @@ static inline void sci_free_dma(struct uart_port *port) static int sci_startup(struct uart_port *port) { struct sci_port *s = to_sci_port(port); + unsigned long flags; int ret; dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); - sci_port_enable(s); - ret = sci_request_irq(s); if (unlikely(ret < 0)) return ret; sci_request_dma(port); + spin_lock_irqsave(&port->lock, flags); sci_start_tx(port); sci_start_rx(port); + spin_unlock_irqrestore(&port->lock, flags); return 0; } @@ -1727,33 +1758,24 @@ static int sci_startup(struct uart_port *port) static void sci_shutdown(struct uart_port *port) { struct sci_port *s = to_sci_port(port); + unsigned long flags; dev_dbg(port->dev, "%s(%d)\n", __func__, port->line); + spin_lock_irqsave(&port->lock, flags); sci_stop_rx(port); sci_stop_tx(port); + spin_unlock_irqrestore(&port->lock, flags); sci_free_dma(port); sci_free_irq(s); - - sci_port_disable(s); } -static unsigned int sci_scbrr_calc(unsigned int algo_id, unsigned int bps, +static unsigned int sci_scbrr_calc(struct sci_port *s, unsigned int bps, unsigned long freq) { - switch (algo_id) { - case SCBRR_ALGO_1: - return ((freq + 16 * bps) / (16 * bps) - 1); - case SCBRR_ALGO_2: - return ((freq + 16 * bps) / (32 * bps) - 1); - case SCBRR_ALGO_3: - return (((freq * 2) + 16 * bps) / (16 * bps) - 1); - case SCBRR_ALGO_4: - return (((freq * 2) + 16 * bps) / (32 * bps) - 1); - case SCBRR_ALGO_5: - return (((freq * 1000 / 32) / bps) - 1); - } + if (s->sampling_rate) + return DIV_ROUND_CLOSEST(freq, s->sampling_rate * bps) - 1; /* Warn, but use a safe default */ WARN_ON(1); @@ -1761,20 +1783,56 @@ static unsigned int sci_scbrr_calc(unsigned int algo_id, unsigned int bps, return ((freq + 16 * bps) / (32 * bps) - 1); } +/* calculate sample rate, BRR, and clock select for HSCIF */ +static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq, + int *brr, unsigned int *srr, + unsigned int *cks) +{ + int sr, c, br, err; + int min_err = 1000; /* 100% */ + + /* Find the combination of sample rate and clock select with the + smallest deviation from the desired baud rate. */ + for (sr = 8; sr <= 32; sr++) { + for (c = 0; c <= 3; c++) { + /* integerized formulas from HSCIF documentation */ + br = freq / (sr * (1 << (2 * c + 1)) * bps) - 1; + if (br < 0 || br > 255) + continue; + err = freq / ((br + 1) * bps * sr * + (1 << (2 * c + 1)) / 1000) - 1000; + if (min_err > err) { + min_err = err; + *brr = br; + *srr = sr - 1; + *cks = c; + } + } + } + + if (min_err == 1000) { + WARN_ON(1); + /* use defaults */ + *brr = 255; + *srr = 15; + *cks = 0; + } +} + static void sci_reset(struct uart_port *port) { struct plat_sci_reg *reg; unsigned int status; do { - status = sci_in(port, SCxSR); + status = serial_port_in(port, SCxSR); } while (!(status & SCxSR_TEND(port))); - sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */ + serial_port_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */ reg = sci_getreg(port, SCFCR); if (reg->size) - sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST); + serial_port_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST); } static void sci_set_termios(struct uart_port *port, struct ktermios *termios, @@ -1782,8 +1840,9 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios, { struct sci_port *s = to_sci_port(port); struct plat_sci_reg *reg; - unsigned int baud, smr_val, max_baud; + unsigned int baud, smr_val, max_baud, cks = 0; int t = -1; + unsigned int srr = 15; /* * earlyprintk comes here early on with port->uartclk set to zero. @@ -1796,47 +1855,52 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios, max_baud = port->uartclk ? port->uartclk / 16 : 115200; baud = uart_get_baud_rate(port, termios, old, 0, max_baud); - if (likely(baud && port->uartclk)) - t = sci_scbrr_calc(s->cfg->scbrr_algo_id, baud, port->uartclk); + if (likely(baud && port->uartclk)) { + if (s->cfg->type == PORT_HSCIF) { + sci_baud_calc_hscif(baud, port->uartclk, &t, &srr, + &cks); + } else { + t = sci_scbrr_calc(s, baud, port->uartclk); + for (cks = 0; t >= 256 && cks <= 3; cks++) + t >>= 2; + } + } sci_port_enable(s); sci_reset(port); - smr_val = sci_in(port, SCSMR) & 3; + smr_val = serial_port_in(port, SCSMR) & 3; if ((termios->c_cflag & CSIZE) == CS7) - smr_val |= 0x40; + smr_val |= SCSMR_CHR; if (termios->c_cflag & PARENB) - smr_val |= 0x20; + smr_val |= SCSMR_PE; if (termios->c_cflag & PARODD) - smr_val |= 0x30; + smr_val |= SCSMR_PE | SCSMR_ODD; if (termios->c_cflag & CSTOPB) - smr_val |= 0x08; + smr_val |= SCSMR_STOP; uart_update_timeout(port, termios->c_cflag, baud); - sci_out(port, SCSMR, smr_val); - - dev_dbg(port->dev, "%s: SMR %x, t %x, SCSCR %x\n", __func__, smr_val, t, - s->cfg->scscr); + dev_dbg(port->dev, "%s: SMR %x, cks %x, t %x, SCSCR %x\n", + __func__, smr_val, cks, t, s->cfg->scscr); - if (t > 0) { - if (t >= 256) { - sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1); - t >>= 2; - } else - sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3); - - sci_out(port, SCBRR, t); + if (t >= 0) { + serial_port_out(port, SCSMR, (smr_val & ~SCSMR_CKS) | cks); + serial_port_out(port, SCBRR, t); + reg = sci_getreg(port, HSSRR); + if (reg->size) + serial_port_out(port, HSSRR, srr | HSCIF_SRE); udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */ - } + } else + serial_port_out(port, SCSMR, smr_val); sci_init_pins(port, termios->c_cflag); reg = sci_getreg(port, SCFCR); if (reg->size) { - unsigned short ctrl = sci_in(port, SCFCR); + unsigned short ctrl = serial_port_in(port, SCFCR); if (s->cfg->capabilities & SCIx_HAVE_RTSCTS) { if (termios->c_cflag & CRTSCTS) @@ -1852,10 +1916,10 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios, */ ctrl &= ~(SCFCR_RFRST | SCFCR_TFRST); - sci_out(port, SCFCR, ctrl); + serial_port_out(port, SCFCR, ctrl); } - sci_out(port, SCSCR, s->cfg->scscr); + serial_port_out(port, SCSCR, s->cfg->scscr); #ifdef CONFIG_SERIAL_SH_SCI_DMA /* @@ -1871,8 +1935,7 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios, if (s->chan_rx) { s->rx_timeout = (port->timeout - HZ / 50) * s->buf_len_rx * 3 / port->fifosize / 2; - dev_dbg(port->dev, - "DMA Rx t-out %ums, tty t-out %u jiffies\n", + dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n", s->rx_timeout * 1000 / HZ, port->timeout); if (s->rx_timeout < msecs_to_jiffies(20)) s->rx_timeout = msecs_to_jiffies(20); @@ -1885,6 +1948,21 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios, sci_port_disable(s); } +static void sci_pm(struct uart_port *port, unsigned int state, + unsigned int oldstate) +{ + struct sci_port *sci_port = to_sci_port(port); + + switch (state) { + case UART_PM_STATE_OFF: + sci_port_disable(sci_port); + break; + default: + sci_port_enable(sci_port); + break; + } +} + static const char *sci_type(struct uart_port *port) { switch (port->type) { @@ -1898,6 +1976,8 @@ static const char *sci_type(struct uart_port *port) return "scifa"; case PORT_SCIFB: return "scifb"; + case PORT_HSCIF: + return "hscif"; } return NULL; @@ -1911,7 +1991,10 @@ static inline unsigned long sci_port_size(struct uart_port *port) * from platform resource data at such a time that ports begin to * behave more erratically. */ - return 64; + if (port->type == PORT_HSCIF) + return 96; + else + return 64; } static int sci_remap_port(struct uart_port *port) @@ -1936,7 +2019,7 @@ static int sci_remap_port(struct uart_port *port) * need to do any remapping, just cast the cookie * directly. */ - port->membase = (void __iomem *)port->mapbase; + port->membase = (void __iomem *)(uintptr_t)port->mapbase; } return 0; @@ -1983,10 +2066,6 @@ static void sci_config_port(struct uart_port *port, int flags) static int sci_verify_port(struct uart_port *port, struct serial_struct *ser) { - struct sci_port *s = to_sci_port(port); - - if (ser->irq != s->cfg->irqs[SCIx_TXI_IRQ] || ser->irq > nr_irqs) - return -EINVAL; if (ser->baud_base < 2400) /* No paper tape reader for Mitch.. */ return -EINVAL; @@ -2006,6 +2085,7 @@ static struct uart_ops sci_uart_ops = { .startup = sci_startup, .shutdown = sci_shutdown, .set_termios = sci_set_termios, + .pm = sci_pm, .type = sci_type, .release_port = sci_release_port, .request_port = sci_request_port, @@ -2017,12 +2097,14 @@ static struct uart_ops sci_uart_ops = { #endif }; -static int __devinit sci_init_single(struct platform_device *dev, - struct sci_port *sci_port, - unsigned int index, - struct plat_sci_port *p) +static int sci_init_single(struct platform_device *dev, + struct sci_port *sci_port, unsigned int index, + struct plat_sci_port *p, bool early) { struct uart_port *port = &sci_port->port; + const struct resource *res; + unsigned int sampling_rate; + unsigned int i; int ret; sci_port->cfg = p; @@ -2031,28 +2113,76 @@ static int __devinit sci_init_single(struct platform_device *dev, port->iotype = UPIO_MEM; port->line = index; + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (res == NULL) + return -ENOMEM; + + port->mapbase = res->start; + + for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i) + sci_port->irqs[i] = platform_get_irq(dev, i); + + /* The SCI generates several interrupts. They can be muxed together or + * connected to different interrupt lines. In the muxed case only one + * interrupt resource is specified. In the non-muxed case three or four + * interrupt resources are specified, as the BRI interrupt is optional. + */ + if (sci_port->irqs[0] < 0) + return -ENXIO; + + if (sci_port->irqs[1] < 0) { + sci_port->irqs[1] = sci_port->irqs[0]; + sci_port->irqs[2] = sci_port->irqs[0]; + sci_port->irqs[3] = sci_port->irqs[0]; + } + + if (p->regtype == SCIx_PROBE_REGTYPE) { + ret = sci_probe_regmap(p); + if (unlikely(ret)) + return ret; + } + switch (p->type) { case PORT_SCIFB: port->fifosize = 256; + sci_port->overrun_bit = 9; + sampling_rate = 16; + break; + case PORT_HSCIF: + port->fifosize = 128; + sampling_rate = 0; + sci_port->overrun_bit = 0; break; case PORT_SCIFA: port->fifosize = 64; + sci_port->overrun_bit = 9; + sampling_rate = 16; break; case PORT_SCIF: port->fifosize = 16; + if (p->regtype == SCIx_SH7705_SCIF_REGTYPE) { + sci_port->overrun_bit = 9; + sampling_rate = 16; + } else { + sci_port->overrun_bit = 0; + sampling_rate = 32; + } break; default: port->fifosize = 1; + sci_port->overrun_bit = 5; + sampling_rate = 32; break; } - if (p->regtype == SCIx_PROBE_REGTYPE) { - ret = sci_probe_regmap(p); - if (unlikely(ret)) - return ret; - } + /* SCIFA on sh7723 and sh7724 need a custom sampling rate that doesn't + * match the SoC datasheet, this should be investigated. Let platform + * data override the sampling rate for now. + */ + sci_port->sampling_rate = p->sampling_rate ? p->sampling_rate + : sampling_rate; - if (dev) { + if (!early) { sci_port->iclk = clk_get(&dev->dev, "sci_ick"); if (IS_ERR(sci_port->iclk)) { sci_port->iclk = clk_get(&dev->dev, "peripheral_clk"); @@ -2072,9 +2202,6 @@ static int __devinit sci_init_single(struct platform_device *dev, port->dev = &dev->dev; - sci_init_gpios(sci_port); - - pm_runtime_irq_safe(&dev->dev); pm_runtime_enable(&dev->dev); } @@ -2085,32 +2212,22 @@ static int __devinit sci_init_single(struct platform_device *dev, /* * Establish some sensible defaults for the error detection. */ - if (!p->error_mask) - p->error_mask = (p->type == PORT_SCI) ? + sci_port->error_mask = (p->type == PORT_SCI) ? SCI_DEFAULT_ERROR_MASK : SCIF_DEFAULT_ERROR_MASK; /* * Establish sensible defaults for the overrun detection, unless * the part has explicitly disabled support for it. */ - if (p->overrun_bit != SCIx_NOT_SUPPORTED) { - if (p->type == PORT_SCI) - p->overrun_bit = 5; - else if (p->scbrr_algo_id == SCBRR_ALGO_4) - p->overrun_bit = 9; - else - p->overrun_bit = 0; - /* - * Make the error mask inclusive of overrun detection, if - * supported. - */ - p->error_mask |= (1 << p->overrun_bit); - } + /* + * Make the error mask inclusive of overrun detection, if + * supported. + */ + sci_port->error_mask |= 1 << sci_port->overrun_bit; - port->mapbase = p->mapbase; port->type = p->type; - port->flags = p->flags; + port->flags = UPF_FIXED_PORT | p->flags; port->regshift = p->regshift; /* @@ -2120,7 +2237,7 @@ static int __devinit sci_init_single(struct platform_device *dev, * * For the muxed case there's nothing more to do. */ - port->irq = p->irqs[SCIx_RXI_IRQ]; + port->irq = sci_port->irqs[SCIx_RXI_IRQ]; port->irqflags = 0; port->serial_in = sci_serial_in; @@ -2133,6 +2250,14 @@ static int __devinit sci_init_single(struct platform_device *dev, return 0; } +static void sci_cleanup_single(struct sci_port *port) +{ + clk_put(port->iclk); + clk_put(port->fclk); + + pm_runtime_disable(port->port.dev); +} + #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE static void serial_console_putchar(struct uart_port *port, int ch) { @@ -2148,21 +2273,38 @@ static void serial_console_write(struct console *co, const char *s, { struct sci_port *sci_port = &sci_ports[co->index]; struct uart_port *port = &sci_port->port; - unsigned short bits; + unsigned short bits, ctrl; + unsigned long flags; + int locked = 1; - sci_port_enable(sci_port); + local_irq_save(flags); + if (port->sysrq) + locked = 0; + else if (oops_in_progress) + locked = spin_trylock(&port->lock); + else + spin_lock(&port->lock); + + /* first save the SCSCR then disable the interrupts */ + ctrl = serial_port_in(port, SCSCR); + serial_port_out(port, SCSCR, sci_port->cfg->scscr); uart_console_write(port, s, count, serial_console_putchar); /* wait until fifo is empty and last bit has been transmitted */ bits = SCxSR_TDxE(port) | SCxSR_TEND(port); - while ((sci_in(port, SCxSR) & bits) != bits) + while ((serial_port_in(port, SCxSR) & bits) != bits) cpu_relax(); - sci_port_disable(sci_port); + /* restore the SCSCR */ + serial_port_out(port, SCSCR, ctrl); + + if (locked) + spin_unlock(&port->lock); + local_irq_restore(flags); } -static int __devinit serial_console_setup(struct console *co, char *options) +static int serial_console_setup(struct console *co, char *options) { struct sci_port *sci_port; struct uart_port *port; @@ -2191,13 +2333,9 @@ static int __devinit serial_console_setup(struct console *co, char *options) if (unlikely(ret != 0)) return ret; - sci_port_enable(sci_port); - if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); - sci_port_disable(sci_port); - return uart_set_options(port, co, baud, parity, bits, flow); } @@ -2220,16 +2358,16 @@ static struct console early_serial_console = { static char early_serial_buf[32]; -static int __devinit sci_probe_earlyprintk(struct platform_device *pdev) +static int sci_probe_earlyprintk(struct platform_device *pdev) { - struct plat_sci_port *cfg = pdev->dev.platform_data; + struct plat_sci_port *cfg = dev_get_platdata(&pdev->dev); if (early_serial_console.data) return -EEXIST; early_serial_console.index = pdev->id; - sci_init_single(NULL, &sci_ports[pdev->id], pdev->id, cfg); + sci_init_single(pdev, &sci_ports[pdev->id], pdev->id, cfg, true); serial_console_setup(&early_serial_console, early_serial_buf); @@ -2240,62 +2378,19 @@ static int __devinit sci_probe_earlyprintk(struct platform_device *pdev) return 0; } -#define uart_console(port) ((port)->cons->index == (port)->line) - -static int sci_runtime_suspend(struct device *dev) -{ - struct sci_port *sci_port = dev_get_drvdata(dev); - struct uart_port *port = &sci_port->port; - - if (uart_console(port)) { - struct plat_sci_reg *reg; - - sci_port->saved_smr = sci_in(port, SCSMR); - sci_port->saved_brr = sci_in(port, SCBRR); - - reg = sci_getreg(port, SCFCR); - if (reg->size) - sci_port->saved_fcr = sci_in(port, SCFCR); - else - sci_port->saved_fcr = 0; - } - return 0; -} - -static int sci_runtime_resume(struct device *dev) -{ - struct sci_port *sci_port = dev_get_drvdata(dev); - struct uart_port *port = &sci_port->port; - - if (uart_console(port)) { - sci_reset(port); - sci_out(port, SCSMR, sci_port->saved_smr); - sci_out(port, SCBRR, sci_port->saved_brr); - - if (sci_port->saved_fcr) - sci_out(port, SCFCR, sci_port->saved_fcr); - - sci_out(port, SCSCR, sci_port->cfg->scscr); - } - return 0; -} - #define SCI_CONSOLE (&serial_console) #else -static inline int __devinit sci_probe_earlyprintk(struct platform_device *pdev) +static inline int sci_probe_earlyprintk(struct platform_device *pdev) { return -EINVAL; } #define SCI_CONSOLE NULL -#define sci_runtime_suspend NULL -#define sci_runtime_resume NULL #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */ -static char banner[] __initdata = - KERN_INFO "SuperH SCI(F) driver initialized\n"; +static const char banner[] __initconst = "SuperH (H)SCI(F) driver initialized"; static struct uart_driver sci_uart_driver = { .owner = THIS_MODULE, @@ -2314,18 +2409,91 @@ static int sci_remove(struct platform_device *dev) cpufreq_unregister_notifier(&port->freq_transition, CPUFREQ_TRANSITION_NOTIFIER); - sci_free_gpios(port); - uart_remove_one_port(&sci_uart_driver, &port->port); - clk_put(port->iclk); - clk_put(port->fclk); + sci_cleanup_single(port); - pm_runtime_disable(&dev->dev); return 0; } -static int __devinit sci_probe_single(struct platform_device *dev, +struct sci_port_info { + unsigned int type; + unsigned int regtype; +}; + +static const struct of_device_id of_sci_match[] = { + { + .compatible = "renesas,scif", + .data = &(const struct sci_port_info) { + .type = PORT_SCIF, + .regtype = SCIx_SH4_SCIF_REGTYPE, + }, + }, { + .compatible = "renesas,scifa", + .data = &(const struct sci_port_info) { + .type = PORT_SCIFA, + .regtype = SCIx_SCIFA_REGTYPE, + }, + }, { + .compatible = "renesas,scifb", + .data = &(const struct sci_port_info) { + .type = PORT_SCIFB, + .regtype = SCIx_SCIFB_REGTYPE, + }, + }, { + .compatible = "renesas,hscif", + .data = &(const struct sci_port_info) { + .type = PORT_HSCIF, + .regtype = SCIx_HSCIF_REGTYPE, + }, + }, { + /* Terminator */ + }, +}; +MODULE_DEVICE_TABLE(of, of_sci_match); + +static struct plat_sci_port * +sci_parse_dt(struct platform_device *pdev, unsigned int *dev_id) +{ + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *match; + const struct sci_port_info *info; + struct plat_sci_port *p; + int id; + + if (!IS_ENABLED(CONFIG_OF) || !np) + return NULL; + + match = of_match_node(of_sci_match, pdev->dev.of_node); + if (!match) + return NULL; + + info = match->data; + + p = devm_kzalloc(&pdev->dev, sizeof(struct plat_sci_port), GFP_KERNEL); + if (!p) { + dev_err(&pdev->dev, "failed to allocate DT config data\n"); + return NULL; + } + + /* Get the line number for the aliases node. */ + id = of_alias_get_id(np, "serial"); + if (id < 0) { + dev_err(&pdev->dev, "failed to get alias id (%d)\n", id); + return NULL; + } + + *dev_id = id; + + p->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF; + p->type = info->type; + p->regtype = info->regtype; + p->scscr = SCSCR_RE | SCSCR_TE; + + return p; +} + +static int sci_probe_single(struct platform_device *dev, unsigned int index, struct plat_sci_port *p, struct sci_port *sciport) @@ -2334,25 +2502,30 @@ static int __devinit sci_probe_single(struct platform_device *dev, /* Sanity check */ if (unlikely(index >= SCI_NPORTS)) { - dev_notice(&dev->dev, "Attempting to register port " - "%d when only %d are available.\n", + dev_notice(&dev->dev, "Attempting to register port %d when only %d are available\n", index+1, SCI_NPORTS); - dev_notice(&dev->dev, "Consider bumping " - "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n"); - return 0; + dev_notice(&dev->dev, "Consider bumping CONFIG_SERIAL_SH_SCI_NR_UARTS!\n"); + return -EINVAL; } - ret = sci_init_single(dev, sciport, index, p); + ret = sci_init_single(dev, sciport, index, p, false); if (ret) return ret; - return uart_add_one_port(&sci_uart_driver, &sciport->port); + ret = uart_add_one_port(&sci_uart_driver, &sciport->port); + if (ret) { + sci_cleanup_single(sciport); + return ret; + } + + return 0; } -static int __devinit sci_probe(struct platform_device *dev) +static int sci_probe(struct platform_device *dev) { - struct plat_sci_port *p = dev->dev.platform_data; - struct sci_port *sp = &sci_ports[dev->id]; + struct plat_sci_port *p; + struct sci_port *sp; + unsigned int dev_id; int ret; /* @@ -2363,28 +2536,42 @@ static int __devinit sci_probe(struct platform_device *dev) if (is_early_platform_device(dev)) return sci_probe_earlyprintk(dev); + if (dev->dev.of_node) { + p = sci_parse_dt(dev, &dev_id); + if (p == NULL) + return -EINVAL; + } else { + p = dev->dev.platform_data; + if (p == NULL) { + dev_err(&dev->dev, "no platform data supplied\n"); + return -EINVAL; + } + + dev_id = dev->id; + } + + sp = &sci_ports[dev_id]; platform_set_drvdata(dev, sp); - ret = sci_probe_single(dev, dev->id, p, sp); + ret = sci_probe_single(dev, dev_id, p, sp); if (ret) - goto err_unreg; + return ret; sp->freq_transition.notifier_call = sci_notifier; ret = cpufreq_register_notifier(&sp->freq_transition, CPUFREQ_TRANSITION_NOTIFIER); - if (unlikely(ret < 0)) - goto err_unreg; + if (unlikely(ret < 0)) { + uart_remove_one_port(&sci_uart_driver, &sp->port); + sci_cleanup_single(sp); + return ret; + } #ifdef CONFIG_SH_STANDARD_BIOS sh_bios_gdb_detach(); #endif return 0; - -err_unreg: - sci_remove(dev); - return ret; } static int sci_suspend(struct device *dev) @@ -2408,8 +2595,6 @@ static int sci_resume(struct device *dev) } static const struct dev_pm_ops sci_dev_pm_ops = { - .runtime_suspend = sci_runtime_suspend, - .runtime_resume = sci_runtime_resume, .suspend = sci_suspend, .resume = sci_resume, }; @@ -2421,6 +2606,7 @@ static struct platform_driver sci_driver = { .name = "sh-sci", .owner = THIS_MODULE, .pm = &sci_dev_pm_ops, + .of_match_table = of_match_ptr(of_sci_match), }, }; @@ -2428,7 +2614,7 @@ static int __init sci_init(void) { int ret; - printk(banner); + pr_info("%s\n", banner); ret = uart_register_driver(&sci_uart_driver); if (likely(ret == 0)) { @@ -2456,4 +2642,4 @@ module_exit(sci_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:sh-sci"); MODULE_AUTHOR("Paul Mundt"); -MODULE_DESCRIPTION("SuperH SCI(F) serial driver"); +MODULE_DESCRIPTION("SuperH (H)SCI(F) serial driver"); |