diff options
Diffstat (limited to 'drivers/serial/amba-pl010.c')
| -rw-r--r-- | drivers/serial/amba-pl010.c | 290 |
1 files changed, 122 insertions, 168 deletions
diff --git a/drivers/serial/amba-pl010.c b/drivers/serial/amba-pl010.c index 321a3b3a572..1631414000a 100644 --- a/drivers/serial/amba-pl010.c +++ b/drivers/serial/amba-pl010.c @@ -51,8 +51,6 @@ #include <linux/amba/serial.h> #include <asm/io.h> -#include <asm/irq.h> -#include <asm/hardware.h> #define UART_NR 2 @@ -62,47 +60,19 @@ #define AMBA_ISR_PASS_LIMIT 256 -/* - * Access macros for the AMBA UARTs - */ -#define UART_GET_INT_STATUS(p) readb((p)->membase + UART010_IIR) -#define UART_PUT_ICR(p, c) writel((c), (p)->membase + UART010_ICR) -#define UART_GET_FR(p) readb((p)->membase + UART01x_FR) -#define UART_GET_CHAR(p) readb((p)->membase + UART01x_DR) -#define UART_PUT_CHAR(p, c) writel((c), (p)->membase + UART01x_DR) -#define UART_GET_RSR(p) readb((p)->membase + UART01x_RSR) -#define UART_GET_CR(p) readb((p)->membase + UART010_CR) -#define UART_PUT_CR(p,c) writel((c), (p)->membase + UART010_CR) -#define UART_GET_LCRL(p) readb((p)->membase + UART010_LCRL) -#define UART_PUT_LCRL(p,c) writel((c), (p)->membase + UART010_LCRL) -#define UART_GET_LCRM(p) readb((p)->membase + UART010_LCRM) -#define UART_PUT_LCRM(p,c) writel((c), (p)->membase + UART010_LCRM) -#define UART_GET_LCRH(p) readb((p)->membase + UART010_LCRH) -#define UART_PUT_LCRH(p,c) writel((c), (p)->membase + UART010_LCRH) #define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0) #define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0) -#define UART_TX_EMPTY(p) ((UART_GET_FR(p) & UART01x_FR_TMSK) == 0) -#define UART_DUMMY_RSR_RX /*256*/0 +#define UART_DUMMY_RSR_RX 256 #define UART_PORT_SIZE 64 /* - * On the Integrator platform, the port RTS and DTR are provided by - * bits in the following SC_CTRLS register bits: - * RTS DTR - * UART0 7 6 - * UART1 5 4 - */ -#define SC_CTRLC (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLC_OFFSET) -#define SC_CTRLS (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLS_OFFSET) - -/* * We wrap our port structure around the generic uart_port. */ struct uart_amba_port { struct uart_port port; - unsigned int dtr_mask; - unsigned int rts_mask; + struct amba_device *dev; + struct amba_pl010_data *data; unsigned int old_status; }; @@ -110,36 +80,36 @@ static void pl010_stop_tx(struct uart_port *port) { unsigned int cr; - cr = UART_GET_CR(port); + cr = readb(port->membase + UART010_CR); cr &= ~UART010_CR_TIE; - UART_PUT_CR(port, cr); + writel(cr, port->membase + UART010_CR); } static void pl010_start_tx(struct uart_port *port) { unsigned int cr; - cr = UART_GET_CR(port); + cr = readb(port->membase + UART010_CR); cr |= UART010_CR_TIE; - UART_PUT_CR(port, cr); + writel(cr, port->membase + UART010_CR); } static void pl010_stop_rx(struct uart_port *port) { unsigned int cr; - cr = UART_GET_CR(port); + cr = readb(port->membase + UART010_CR); cr &= ~(UART010_CR_RIE | UART010_CR_RTIE); - UART_PUT_CR(port, cr); + writel(cr, port->membase + UART010_CR); } static void pl010_enable_ms(struct uart_port *port) { unsigned int cr; - cr = UART_GET_CR(port); + cr = readb(port->membase + UART010_CR); cr |= UART010_CR_MSIE; - UART_PUT_CR(port, cr); + writel(cr, port->membase + UART010_CR); } static void @@ -152,9 +122,9 @@ pl010_rx_chars(struct uart_port *port) struct tty_struct *tty = port->info->tty; unsigned int status, ch, flag, rsr, max_count = 256; - status = UART_GET_FR(port); + status = readb(port->membase + UART01x_FR); while (UART_RX_DATA(status) && max_count--) { - ch = UART_GET_CHAR(port); + ch = readb(port->membase + UART01x_DR); flag = TTY_NORMAL; port->icount.rx++; @@ -163,7 +133,7 @@ pl010_rx_chars(struct uart_port *port) * Note that the error handling code is * out of the main execution path */ - rsr = UART_GET_RSR(port) | UART_DUMMY_RSR_RX; + rsr = readb(port->membase + UART01x_RSR) | UART_DUMMY_RSR_RX; if (unlikely(rsr & UART01x_RSR_ANY)) { if (rsr & UART01x_RSR_BE) { rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE); @@ -193,7 +163,7 @@ pl010_rx_chars(struct uart_port *port) uart_insert_char(port, rsr, UART01x_RSR_OE, ch, flag); ignore_char: - status = UART_GET_FR(port); + status = readb(port->membase + UART01x_FR); } tty_flip_buffer_push(tty); return; @@ -205,7 +175,7 @@ static void pl010_tx_chars(struct uart_port *port) int count; if (port->x_char) { - UART_PUT_CHAR(port, port->x_char); + writel(port->x_char, port->membase + UART01x_DR); port->icount.tx++; port->x_char = 0; return; @@ -217,7 +187,7 @@ static void pl010_tx_chars(struct uart_port *port) count = port->fifosize >> 1; do { - UART_PUT_CHAR(port, xmit->buf[xmit->tail]); + writel(xmit->buf[xmit->tail], port->membase + UART01x_DR); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); port->icount.tx++; if (uart_circ_empty(xmit)) @@ -236,9 +206,9 @@ static void pl010_modem_status(struct uart_port *port) struct uart_amba_port *uap = (struct uart_amba_port *)port; unsigned int status, delta; - UART_PUT_ICR(&uap->port, 0); + writel(0, uap->port.membase + UART010_ICR); - status = UART_GET_FR(&uap->port) & UART01x_FR_MODEM_ANY; + status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY; delta = status ^ uap->old_status; uap->old_status = status; @@ -266,7 +236,7 @@ static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs) spin_lock(&port->lock); - status = UART_GET_INT_STATUS(port); + status = readb(port->membase + UART010_IIR); if (status) { do { if (status & (UART010_IIR_RTIS | UART010_IIR_RIS)) @@ -283,7 +253,7 @@ static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs) if (pass_counter-- == 0) break; - status = UART_GET_INT_STATUS(port); + status = readb(port->membase + UART010_IIR); } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS | UART010_IIR_TIS)); handled = 1; @@ -296,7 +266,7 @@ static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs) static unsigned int pl010_tx_empty(struct uart_port *port) { - return UART_GET_FR(port) & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT; + return readb(port->membase + UART01x_FR) & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT; } static unsigned int pl010_get_mctrl(struct uart_port *port) @@ -304,7 +274,7 @@ static unsigned int pl010_get_mctrl(struct uart_port *port) unsigned int result = 0; unsigned int status; - status = UART_GET_FR(port); + status = readb(port->membase + UART01x_FR); if (status & UART01x_FR_DCD) result |= TIOCM_CAR; if (status & UART01x_FR_DSR) @@ -318,20 +288,9 @@ static unsigned int pl010_get_mctrl(struct uart_port *port) static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl) { struct uart_amba_port *uap = (struct uart_amba_port *)port; - unsigned int ctrls = 0, ctrlc = 0; - - if (mctrl & TIOCM_RTS) - ctrlc |= uap->rts_mask; - else - ctrls |= uap->rts_mask; - if (mctrl & TIOCM_DTR) - ctrlc |= uap->dtr_mask; - else - ctrls |= uap->dtr_mask; - - __raw_writel(ctrls, SC_CTRLS); - __raw_writel(ctrlc, SC_CTRLC); + if (uap->data) + uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl); } static void pl010_break_ctl(struct uart_port *port, int break_state) @@ -340,12 +299,12 @@ static void pl010_break_ctl(struct uart_port *port, int break_state) unsigned int lcr_h; spin_lock_irqsave(&port->lock, flags); - lcr_h = UART_GET_LCRH(port); + lcr_h = readb(port->membase + UART010_LCRH); if (break_state == -1) lcr_h |= UART01x_LCRH_BRK; else lcr_h &= ~UART01x_LCRH_BRK; - UART_PUT_LCRH(port, lcr_h); + writel(lcr_h, port->membase + UART010_LCRH); spin_unlock_irqrestore(&port->lock, flags); } @@ -364,13 +323,13 @@ static int pl010_startup(struct uart_port *port) /* * initialise the old status of the modem signals */ - uap->old_status = UART_GET_FR(port) & UART01x_FR_MODEM_ANY; + uap->old_status = readb(port->membase + UART01x_FR) & UART01x_FR_MODEM_ANY; /* * Finally, enable interrupts */ - UART_PUT_CR(port, UART01x_CR_UARTEN | UART010_CR_RIE | - UART010_CR_RTIE); + writel(UART01x_CR_UARTEN | UART010_CR_RIE | UART010_CR_RTIE, + port->membase + UART010_CR); return 0; } @@ -385,11 +344,12 @@ static void pl010_shutdown(struct uart_port *port) /* * disable all interrupts, disable the port */ - UART_PUT_CR(port, 0); + writel(0, port->membase + UART010_CR); /* disable break condition and fifos */ - UART_PUT_LCRH(port, UART_GET_LCRH(port) & - ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN)); + writel(readb(port->membase + UART010_LCRH) & + ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN), + port->membase + UART010_LCRH); } static void @@ -466,25 +426,25 @@ pl010_set_termios(struct uart_port *port, struct termios *termios, port->ignore_status_mask |= UART_DUMMY_RSR_RX; /* first, disable everything */ - old_cr = UART_GET_CR(port) & ~UART010_CR_MSIE; + old_cr = readb(port->membase + UART010_CR) & ~UART010_CR_MSIE; if (UART_ENABLE_MS(port, termios->c_cflag)) old_cr |= UART010_CR_MSIE; - UART_PUT_CR(port, 0); + writel(0, port->membase + UART010_CR); /* Set baud rate */ quot -= 1; - UART_PUT_LCRM(port, ((quot & 0xf00) >> 8)); - UART_PUT_LCRL(port, (quot & 0xff)); + writel((quot & 0xf00) >> 8, port->membase + UART010_LCRM); + writel(quot & 0xff, port->membase + UART010_LCRL); /* * ----------v----------v----------v----------v----- * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L * ----------^----------^----------^----------^----- */ - UART_PUT_LCRH(port, lcr_h); - UART_PUT_CR(port, old_cr); + writel(lcr_h, port->membase + UART010_LCRH); + writel(old_cr, port->membase + UART010_CR); spin_unlock_irqrestore(&port->lock, flags); } @@ -556,87 +516,53 @@ static struct uart_ops amba_pl010_pops = { .verify_port = pl010_verify_port, }; -static struct uart_amba_port amba_ports[UART_NR] = { - { - .port = { - .membase = (void *)IO_ADDRESS(INTEGRATOR_UART0_BASE), - .mapbase = INTEGRATOR_UART0_BASE, - .iotype = UPIO_MEM, - .irq = IRQ_UARTINT0, - .uartclk = 14745600, - .fifosize = 16, - .ops = &amba_pl010_pops, - .flags = UPF_BOOT_AUTOCONF, - .line = 0, - }, - .dtr_mask = 1 << 5, - .rts_mask = 1 << 4, - }, - { - .port = { - .membase = (void *)IO_ADDRESS(INTEGRATOR_UART1_BASE), - .mapbase = INTEGRATOR_UART1_BASE, - .iotype = UPIO_MEM, - .irq = IRQ_UARTINT1, - .uartclk = 14745600, - .fifosize = 16, - .ops = &amba_pl010_pops, - .flags = UPF_BOOT_AUTOCONF, - .line = 1, - }, - .dtr_mask = 1 << 7, - .rts_mask = 1 << 6, - } -}; +static struct uart_amba_port *amba_ports[UART_NR]; #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE +static void pl010_console_putchar(struct uart_port *port, int ch) +{ + unsigned int status; + + do { + status = readb(port->membase + UART01x_FR); + barrier(); + } while (!UART_TX_READY(status)); + writel(ch, port->membase + UART01x_DR); +} + static void pl010_console_write(struct console *co, const char *s, unsigned int count) { - struct uart_port *port = &amba_ports[co->index].port; + struct uart_port *port = &amba_ports[co->index]->port; unsigned int status, old_cr; - int i; /* * First save the CR then disable the interrupts */ - old_cr = UART_GET_CR(port); - UART_PUT_CR(port, UART01x_CR_UARTEN); + old_cr = readb(port->membase + UART010_CR); + writel(UART01x_CR_UARTEN, port->membase + UART010_CR); - /* - * Now, do each character - */ - for (i = 0; i < count; i++) { - do { - status = UART_GET_FR(port); - } while (!UART_TX_READY(status)); - UART_PUT_CHAR(port, s[i]); - if (s[i] == '\n') { - do { - status = UART_GET_FR(port); - } while (!UART_TX_READY(status)); - UART_PUT_CHAR(port, '\r'); - } - } + uart_console_write(port, s, count, pl010_console_putchar); /* * Finally, wait for transmitter to become empty * and restore the TCR */ do { - status = UART_GET_FR(port); + status = readb(port->membase + UART01x_FR); + barrier(); } while (status & UART01x_FR_BUSY); - UART_PUT_CR(port, old_cr); + writel(old_cr, port->membase + UART010_CR); } static void __init pl010_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits) { - if (UART_GET_CR(port) & UART01x_CR_UARTEN) { + if (readb(port->membase + UART010_CR) & UART01x_CR_UARTEN) { unsigned int lcr_h, quot; - lcr_h = UART_GET_LCRH(port); + lcr_h = readb(port->membase + UART010_LCRH); *parity = 'n'; if (lcr_h & UART01x_LCRH_PEN) { @@ -651,7 +577,7 @@ pl010_console_get_options(struct uart_port *port, int *baud, else *bits = 8; - quot = UART_GET_LCRL(port) | UART_GET_LCRM(port) << 8; + quot = readb(port->membase + UART010_LCRL) | readb(port->membase + UART010_LCRM) << 8; *baud = port->uartclk / (16 * (quot + 1)); } } @@ -671,7 +597,7 @@ static int __init pl010_console_setup(struct console *co, char *options) */ if (co->index >= UART_NR) co->index = 0; - port = &amba_ports[co->index].port; + port = &amba_ports[co->index]->port; if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); @@ -692,24 +618,6 @@ static struct console amba_console = { .data = &amba_reg, }; -static int __init amba_console_init(void) -{ - /* - * All port initializations are done statically - */ - register_console(&amba_console); - return 0; -} -console_initcall(amba_console_init); - -static int __init amba_late_console_init(void) -{ - if (!(amba_console.flags & CON_ENABLED)) - register_console(&amba_console); - return 0; -} -late_initcall(amba_late_console_init); - #define AMBA_CONSOLE &amba_console #else #define AMBA_CONSOLE NULL @@ -727,30 +635,76 @@ static struct uart_driver amba_reg = { static int pl010_probe(struct amba_device *dev, void *id) { - int i; + struct uart_amba_port *port; + void __iomem *base; + int i, ret; - for (i = 0; i < UART_NR; i++) { - if (amba_ports[i].port.mapbase != dev->res.start) - continue; + for (i = 0; i < ARRAY_SIZE(amba_ports); i++) + if (amba_ports[i] == NULL) + break; - amba_ports[i].port.dev = &dev->dev; - uart_add_one_port(&amba_reg, &amba_ports[i].port); - amba_set_drvdata(dev, &amba_ports[i]); - break; + if (i == ARRAY_SIZE(amba_ports)) { + ret = -EBUSY; + goto out; } - return 0; + port = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL); + if (!port) { + ret = -ENOMEM; + goto out; + } + + base = ioremap(dev->res.start, PAGE_SIZE); + if (!base) { + ret = -ENOMEM; + goto free; + } + + port->port.dev = &dev->dev; + port->port.mapbase = dev->res.start; + port->port.membase = base; + port->port.iotype = UPIO_MEM; + port->port.irq = dev->irq[0]; + port->port.uartclk = 14745600; + port->port.fifosize = 16; + port->port.ops = &amba_pl010_pops; + port->port.flags = UPF_BOOT_AUTOCONF; + port->port.line = i; + port->dev = dev; + port->data = dev->dev.platform_data; + + amba_ports[i] = port; + + amba_set_drvdata(dev, port); + ret = uart_add_one_port(&amba_reg, &port->port); + if (ret) { + amba_set_drvdata(dev, NULL); + amba_ports[i] = NULL; + iounmap(base); + free: + kfree(port); + } + + out: + return ret; } static int pl010_remove(struct amba_device *dev) { - struct uart_amba_port *uap = amba_get_drvdata(dev); - - if (uap) - uart_remove_one_port(&amba_reg, &uap->port); + struct uart_amba_port *port = amba_get_drvdata(dev); + int i; amba_set_drvdata(dev, NULL); + uart_remove_one_port(&amba_reg, &port->port); + + for (i = 0; i < ARRAY_SIZE(amba_ports); i++) + if (amba_ports[i] == port) + amba_ports[i] = NULL; + + iounmap(port->port.membase); + kfree(port); + return 0; } |