diff options
Diffstat (limited to 'drivers/serial/sh-sci.c')
| -rw-r--r-- | drivers/serial/sh-sci.c | 154 |
1 files changed, 75 insertions, 79 deletions
diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c index 3df2aaec829f..165fc010978c 100644 --- a/drivers/serial/sh-sci.c +++ b/drivers/serial/sh-sci.c @@ -3,7 +3,7 @@ * * SuperH on-chip serial module support. (SCI with no FIFO / with FIFO) * - * Copyright (C) 2002 - 2006 Paul Mundt + * Copyright (C) 2002 - 2008 Paul Mundt * Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007). * * based off of the old drivers/char/sh-sci.c by: @@ -46,6 +46,7 @@ #include <linux/cpufreq.h> #include <linux/clk.h> #include <linux/ctype.h> +#include <linux/err.h> #ifdef CONFIG_SUPERH #include <asm/clock.h> @@ -78,7 +79,7 @@ struct sci_port { struct timer_list break_timer; int break_flag; -#ifdef CONFIG_SUPERH +#ifdef CONFIG_HAVE_CLK /* Port clock */ struct clk *clk; #endif @@ -143,9 +144,9 @@ static void put_char(struct uart_port *port, char c) status = sci_in(port, SCxSR); } while (!(status & SCxSR_TDxE(port))); - sci_out(port, SCxTDR, c); sci_in(port, SCxSR); /* Dummy read */ sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); + sci_out(port, SCxTDR, c); spin_unlock_irqrestore(&port->lock, flags); } @@ -249,8 +250,7 @@ static inline void h8300_sci_disable(struct uart_port *port) } #endif -#if defined(SCI_ONLY) || defined(SCI_AND_SCIF) && \ - defined(__H8300H__) || defined(__H8300S__) +#if defined(__H8300H__) || defined(__H8300S__) static void sci_init_pins_sci(struct uart_port* port, unsigned int cflag) { int ch = (port->mapbase - SMR0) >> 3; @@ -284,11 +284,6 @@ static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag) #define sci_init_pins_irda NULL #endif -#ifdef SCI_ONLY -#define sci_init_pins_scif NULL -#endif - -#if defined(SCIF_ONLY) || defined(SCI_AND_SCIF) #if defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712) static void sci_init_pins_scif(struct uart_port* port, unsigned int cflag) { @@ -448,7 +443,6 @@ static inline int scif_rxroom(struct uart_port *port) return sci_in(port, SCFDR) & SCIF_RFDC_MASK; } #endif -#endif /* SCIF_ONLY || SCI_AND_SCIF */ static inline int sci_txroom(struct uart_port *port) { @@ -484,12 +478,10 @@ static void sci_transmit_chars(struct uart_port *port) return; } -#ifndef SCI_ONLY - if (port->type == PORT_SCIF) - count = scif_txroom(port); - else -#endif + if (port->type == PORT_SCI) count = sci_txroom(port); + else + count = scif_txroom(port); do { unsigned char c; @@ -518,12 +510,10 @@ static void sci_transmit_chars(struct uart_port *port) } else { ctrl = sci_in(port, SCSCR); -#if !defined(SCI_ONLY) - if (port->type == PORT_SCIF) { + if (port->type != PORT_SCI) { sci_in(port, SCxSR); /* Dummy read */ sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port)); } -#endif ctrl |= SCI_CTRL_FLAGS_TIE; sci_out(port, SCSCR, ctrl); @@ -546,12 +536,10 @@ static inline void sci_receive_chars(struct uart_port *port) return; while (1) { -#if !defined(SCI_ONLY) - if (port->type == PORT_SCIF) - count = scif_rxroom(port); - else -#endif + if (port->type == PORT_SCI) count = sci_rxroom(port); + else + count = scif_rxroom(port); /* Don't copy more bytes than there is room for in the buffer */ count = tty_buffer_request_room(tty, count); @@ -726,7 +714,7 @@ static inline int sci_handle_breaks(struct uart_port *port) #if defined(SCIF_ORER) /* XXX: Handle SCIF overrun error */ - if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) { + if (port->type != PORT_SCI && (sci_in(port, SCLSR) & SCIF_ORER) != 0) { sci_out(port, SCLSR, 0); if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) { copied++; @@ -809,29 +797,30 @@ static irqreturn_t sci_br_interrupt(int irq, void *ptr) static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) { - unsigned short ssr_status, scr_status; - struct uart_port *port = ptr; + unsigned short ssr_status, scr_status; + struct uart_port *port = ptr; + irqreturn_t ret = IRQ_NONE; ssr_status = sci_in(port,SCxSR); scr_status = sci_in(port,SCSCR); /* Tx Interrupt */ - if ((ssr_status & 0x0020) && (scr_status & 0x0080)) - sci_tx_interrupt(irq, ptr); + if ((ssr_status & 0x0020) && (scr_status & SCI_CTRL_FLAGS_TIE)) + ret = sci_tx_interrupt(irq, ptr); /* Rx Interrupt */ - if ((ssr_status & 0x0002) && (scr_status & 0x0040)) - sci_rx_interrupt(irq, ptr); + if ((ssr_status & 0x0002) && (scr_status & SCI_CTRL_FLAGS_RIE)) + ret = sci_rx_interrupt(irq, ptr); /* Error Interrupt */ - if ((ssr_status & 0x0080) && (scr_status & 0x0400)) - sci_er_interrupt(irq, ptr); + if ((ssr_status & 0x0080) && (scr_status & SCI_CTRL_FLAGS_REIE)) + ret = sci_er_interrupt(irq, ptr); /* Break Interrupt */ - if ((ssr_status & 0x0010) && (scr_status & 0x0200)) - sci_br_interrupt(irq, ptr); + if ((ssr_status & 0x0010) && (scr_status & SCI_CTRL_FLAGS_REIE)) + ret = sci_br_interrupt(irq, ptr); - return IRQ_HANDLED; + return ret; } -#ifdef CONFIG_CPU_FREQ +#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_HAVE_CLK) /* * Here we define a transistion notifier so that we can update all of our * ports' baud rate when the peripheral clock changes. @@ -860,7 +849,7 @@ static int sci_notifier(struct notifier_block *self, * Clean this up later.. */ clk = clk_get(NULL, "module_clk"); - port->uartclk = clk_get_rate(clk) * 16; + port->uartclk = clk_get_rate(clk); clk_put(clk); } @@ -873,7 +862,7 @@ static int sci_notifier(struct notifier_block *self, } static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 }; -#endif /* CONFIG_CPU_FREQ */ +#endif /* CONFIG_CPU_FREQ && CONFIG_HAVE_CLK */ static int sci_request_irq(struct sci_port *port) { @@ -1008,7 +997,7 @@ static int sci_startup(struct uart_port *port) if (s->enable) s->enable(port); -#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) +#ifdef CONFIG_HAVE_CLK s->clk = clk_get(NULL, "module_clk"); #endif @@ -1030,7 +1019,7 @@ static void sci_shutdown(struct uart_port *port) if (s->disable) s->disable(port); -#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) +#ifdef CONFIG_HAVE_CLK clk_put(s->clk); s->clk = NULL; #endif @@ -1041,24 +1030,11 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios, { struct sci_port *s = &sci_ports[port->line]; unsigned int status, baud, smr_val; - int t; + int t = -1; baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); - - switch (baud) { - case 0: - t = -1; - break; - default: - { -#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) - t = SCBRR_VALUE(baud, clk_get_rate(s->clk)); -#else - t = SCBRR_VALUE(baud); -#endif - break; - } - } + if (likely(baud)) + t = SCBRR_VALUE(baud, port->uartclk); do { status = sci_in(port, SCxSR); @@ -1066,10 +1042,8 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios, sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */ -#if !defined(SCI_ONLY) - if (port->type == PORT_SCIF) + if (port->type != PORT_SCI) sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST); -#endif smr_val = sci_in(port, SCSMR) & 3; if ((termios->c_cflag & CSIZE) == CS7) @@ -1111,9 +1085,10 @@ static const char *sci_type(struct uart_port *port) case PORT_SCI: return "sci"; case PORT_SCIF: return "scif"; case PORT_IRDA: return "irda"; + case PORT_SCIFA: return "scifa"; } - return 0; + return NULL; } static void sci_release_port(struct uart_port *port) @@ -1138,6 +1113,7 @@ static void sci_config_port(struct uart_port *port, int flags) s->init_pins = sci_init_pins_sci; break; case PORT_SCIF: + case PORT_SCIFA: s->init_pins = sci_init_pins_scif; break; case PORT_IRDA: @@ -1145,19 +1121,23 @@ static void sci_config_port(struct uart_port *port, int flags) break; } -#if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103) - if (port->mapbase == 0) + if (port->flags & UPF_IOREMAP && !port->membase) { +#if defined(CONFIG_SUPERH64) port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF"); - - port->membase = (void __iomem *)port->mapbase; + port->membase = (void __iomem *)port->mapbase; +#else + port->membase = ioremap_nocache(port->mapbase, 0x40); #endif + + printk(KERN_ERR "sci: can't remap port#%d\n", port->line); + } } static int sci_verify_port(struct uart_port *port, struct serial_struct *ser) { struct sci_port *s = &sci_ports[port->line]; - if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > NR_IRQS) + if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > nr_irqs) return -EINVAL; if (ser->baud_base < 2400) /* No paper tape reader for Mitch.. */ @@ -1207,17 +1187,17 @@ static void __init sci_init_ports(void) sci_ports[i].disable = h8300_sci_disable; #endif sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK; -#elif defined(CONFIG_SUPERH64) - sci_ports[i].port.uartclk = current_cpu_data.module_clock * 16; -#else +#elif defined(CONFIG_HAVE_CLK) /* * XXX: We should use a proper SCI/SCIF clock */ { struct clk *clk = clk_get(NULL, "module_clk"); - sci_ports[i].port.uartclk = clk_get_rate(clk) * 16; + sci_ports[i].port.uartclk = clk_get_rate(clk); clk_put(clk); } +#else +#error "Need a valid uartclk" #endif sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i]; @@ -1285,7 +1265,7 @@ static int __init serial_console_setup(struct console *co, char *options) port->type = serial_console_port->type; -#if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64) +#ifdef CONFIG_HAVE_CLK if (!serial_console_port->clk) serial_console_port->clk = clk_get(NULL, "module_clk"); #endif @@ -1436,7 +1416,7 @@ static struct uart_driver sci_uart_driver = { static int __devinit sci_probe(struct platform_device *dev) { struct plat_sci_port *p = dev->dev.platform_data; - int i; + int i, ret = -EINVAL; for (i = 0; p && p->flags != 0; p++, i++) { struct sci_port *sciport = &sci_ports[i]; @@ -1453,12 +1433,22 @@ static int __devinit sci_probe(struct platform_device *dev) sciport->port.mapbase = p->mapbase; - /* - * For the simple (and majority of) cases where we don't need - * to do any remapping, just cast the cookie directly. - */ - if (p->mapbase && !p->membase && !(p->flags & UPF_IOREMAP)) - p->membase = (void __iomem *)p->mapbase; + if (p->mapbase && !p->membase) { + if (p->flags & UPF_IOREMAP) { + p->membase = ioremap_nocache(p->mapbase, 0x40); + if (IS_ERR(p->membase)) { + ret = PTR_ERR(p->membase); + goto err_unreg; + } + } else { + /* + * For the simple (and majority of) cases + * where we don't need to do any remapping, + * just cast the cookie directly. + */ + p->membase = (void __iomem *)p->mapbase; + } + } sciport->port.membase = p->membase; @@ -1479,7 +1469,7 @@ static int __devinit sci_probe(struct platform_device *dev) kgdb_putchar = kgdb_sci_putchar; #endif -#ifdef CONFIG_CPU_FREQ +#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_HAVE_CLK) cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER); dev_info(&dev->dev, "CPU frequency notifier registered\n"); #endif @@ -1489,6 +1479,12 @@ static int __devinit sci_probe(struct platform_device *dev) #endif return 0; + +err_unreg: + for (i = i - 1; i >= 0; i--) + uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port); + + return ret; } static int __devexit sci_remove(struct platform_device *dev) |