Re: [PATCH 2/2] Uart driver for ST Microelectronics ConneXt(STA2X11/STA2X10).
From: Vimal Singh
Date: Mon Nov 16 2009 - 01:26:23 EST
This patch has got line-wrapping issue. Please fix that and re-post.
-vimal
On Mon, Nov 16, 2009 at 8:55 AM, Feng, Xiaobing
<Xiaobing.Feng@xxxxxxxxxxxxx> wrote:
> Hi
> The patch is a serial driver for PL011 UART base on PCI
> express. It was develop for ST Microelectronics's ConneXt board.
> ST Microelectronics ConneXt(STA2X11/STA2X10), a PCI express
> multifunction chip that provides Input/Output capabilities.
> This driver derive from drivers/serial/amba-pl011.c, I added PCI
> express feature and some platform-dependent features in it, which make
> it support PL011 on ConneXt as a PCI express device.
> The patch has been checked by scripts/checkpatch.pl .
>
>
>
> From a567d7644d15b4eb0ae511f4e02307e62be127c9 Mon Sep 17 00:00:00 2001
> From: Billy <billy@billy-laptop.(none)>
> Date: Fri, 13 Nov 2009 18:17:04 +0800
> Subject: [PATCH] Add pl011 uart support for STMICRO's ConneXt, which
> base on PCI and derive from Amba-pl011.c
>
> Signed-off-by: XiaoBing Feng (Billy Feng) <xiaobing.feng@xxxxxxxxxxxxx>
> Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@xxxxxx>
> ---
> drivers/serial/Kconfig | 10 +
> drivers/serial/Makefile | 1 +
> drivers/serial/pl011-pci.c | 949
> ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 960 insertions(+), 0 deletions(-)
> create mode 100644 drivers/serial/pl011-pci.c
>
> diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
> index 6553833..c42c402 100644
> --- a/drivers/serial/Kconfig
> +++ b/drivers/serial/Kconfig
> @@ -331,6 +331,16 @@ config SERIAL_AMBA_PL011_CONSOLE
> your boot loader (lilo or loadlin) about how to pass options
> to the
> kernel at boot time.)
>
> +config SERIAL_PCI_PL011
> + tristate "PL011 serial port based on PCI support"
> + depends on PCI
> + select SERIAL_CORE
> +
> +config SERIAL_PCI_PL011_CONSOLE
> + bool "Support for console on PL011 serial port based on PCI"
> + depends on SERIAL_PCI_PL011=y
> + select SERIAL_CORE_CONSOLE
> +
> config SERIAL_SB1250_DUART
> tristate "BCM1xxx on-chip DUART serial support"
> depends on SIBYTE_SB1xxx_SOC=y
> diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
> index d5a2998..e8e5cfd 100644
> --- a/drivers/serial/Makefile
> +++ b/drivers/serial/Makefile
> @@ -30,6 +30,7 @@ obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
> obj-$(CONFIG_SERIAL_8250_MCA) += 8250_mca.o
> obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
> obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
> +obj-$(CONFIG_SERIAL_PCI_PL011) += pl011-pci.o
> obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o
> obj-$(CONFIG_SERIAL_PXA) += pxa.o
> obj-$(CONFIG_SERIAL_PNX8XXX) += pnx8xxx_uart.o
> diff --git a/drivers/serial/pl011-pci.c b/drivers/serial/pl011-pci.c
> new file mode 100644
> index 0000000..6783b0d
> --- /dev/null
> +++ b/drivers/serial/pl011-pci.c
> @@ -0,0 +1,949 @@
> +/*
> +* linux/drivers/serial/pl011-pci.c
> +*
> +* ST Microelectronics ConneXt(STA2X11/STA2X10) UART file
> +* derive from AMBA-pl011.c
> +*
> +* Copyright (c) 2009 Wind River Systems, Inc.
> +*
> +* This program is free software; you can redistribute it and/or modify
> +* it under the terms of the GNU General Public License version 2 as
> +* published by the Free Software Foundation.
> +*
> +* This program is distributed in the hope that it will be useful,
> +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> +* See the GNU General Public License for more details.
> +*
> +* You should have received a copy of the GNU General Public License
> +* along with this program; if not, write to the Free Software
> +* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
> USA
> +*
> +*/
> +#include <linux/moduleparam.h>
> +#include <linux/pci.h>
> +#include <linux/module.h>
> +#include <linux/ioport.h>
> +#include <linux/init.h>
> +#include <linux/console.h>
> +#include <linux/sysrq.h>
> +#include <linux/device.h>
> +#include <linux/tty.h>
> +#include <linux/tty_flip.h>
> +#include <linux/serial_core.h>
> +#include <linux/serial.h>
> +#include <linux/amba/bus.h>
> +#include <linux/amba/serial.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +
> +
> +#if defined(CONFIG_SERIAL_PCI_PL011_CONSOLE) &&
> defined(CONFIG_MAGIC_SYSRQ)
> +#define SUPPORT_SYSRQ
> +#endif
> +
> +#define DRV_VERSION "1.0.0"
> +#define PCI_PL011_DRIVER_NAME "ttyAM"
> +#define PCI_PL011_MAJOR 204
> +#define PCI_PL011_MINOR_START 16
> +#define MAXPORTS 1
> +#define UART_NR 4
> +#define PL011_HWFC 1
> +#define PL011_NO_HWFC 2
> +#define AMBA_ISR_PASS_LIMIT 256
> +#define UARTCLK 32000000
> +
> +#define UART_DR_ERROR \
> + (UART011_DR_OE|UART011_DR_BE|UART011_DR_PE|UART011_DR_FE)
> +
> +#define UART_DUMMY_DR_RX (1 << 16)
> +#define SZ_4K 0x00001000
> +
> +static LIST_HEAD(pci_pl011_adapter_head);
> +/**
> + * We wrap our port structure around the generic uart_port.
> + */
> +struct uart_amba_port {
> + struct uart_port port;
> + struct clk *clk;
> + unsigned int im; /** interrupt mask */
> + unsigned int old_status;
> + unsigned int ifls; /** vendor-specific */
> +};
> +
> +struct pci_pl011_adapter{
> +
> + u8 rev; /** PCI revision ID */
> + struct pci_dev *pci_dev;
> + int type;
> + int index;
> +
> + spinlock_t intr_lock;
> +
> + u32 irq; /** Interrupt request number */
> + u64 intr_count; /** Count of interrupts */
> +
> + u64 membase; /** Start of base memory */
> + u64 membase_end; /** End of base memory */
> +
> + u8 __iomem *re_map_membase;/** Remapped memory */
> +
> + u64 iobase; /** Start of io base */
> + u64 iobase_end; /** End of io base */
> +
> + int numb_ports;
> + struct uart_amba_port port_info[MAXPORTS];
> + struct list_head pci_pl011_adapter_entry;
> +};
> +
> +
> +
> +/** There is by now at least one vendor with differing details, so
> handle it */
> +struct vendor_data {
> + unsigned int ifls;
> + unsigned int fifosize;
> +};
> +
> +static struct vendor_data vendor_st = {
> + .ifls =
> UART011_IFLS_RX_HALF|UART011_IFLS_TX_HALF,
> + .fifosize = 64,
> +};
> +
> +static void pl011_stop_tx(struct uart_port *port)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> +
> + uap->im &= ~UART011_TXIM;
> + writel(uap->im, uap->port.membase + UART011_IMSC);
> +}
> +
> +static void pl011_start_tx(struct uart_port *port)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> +
> + uap->im |= UART011_TXIM;
> + writel(uap->im, uap->port.membase + UART011_IMSC);
> +}
> +
> +static void pl011_stop_rx(struct uart_port *port)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> +
> + uap->im &= ~(UART011_RXIM|UART011_RTIM|UART011_FEIM|
> + UART011_PEIM|UART011_BEIM|UART011_OEIM);
> + writel(uap->im, uap->port.membase + UART011_IMSC);
> +}
> +
> +static void pl011_enable_ms(struct uart_port *port)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> +
> + uap->im |=
> UART011_RIMIM|UART011_CTSMIM|UART011_DCDMIM|UART011_DSRMIM;
> + writel(uap->im, uap->port.membase + UART011_IMSC);
> +}
> +
> +static void pl011_rx_chars(struct uart_amba_port *uap)
> +{
> + struct tty_struct *tty = uap->port.state->port.tty;
> + unsigned int status, ch, flag, max_count = 256;
> +
> + status = readl(uap->port.membase + UART01x_FR);
> + while ((status & UART01x_FR_RXFE) == 0 && max_count--) {
> + ch = readl(uap->port.membase + UART01x_DR) |
> UART_DUMMY_DR_RX;
> + flag = TTY_NORMAL;
> + uap->port.icount.rx++;
> +
> + /**
> + * Note that the error handling code is
> + * out of the main execution path
> + */
> + if (unlikely(ch & UART_DR_ERROR)) {
> + if (ch & UART011_DR_BE) {
> + ch &= ~(UART011_DR_FE | UART011_DR_PE);
> + uap->port.icount.brk++;
> + if (uart_handle_break(&uap->port))
> + goto ignore_char;
> + } else if (ch & UART011_DR_PE)
> + uap->port.icount.parity++;
> + else if (ch & UART011_DR_FE)
> + uap->port.icount.frame++;
> + if (ch & UART011_DR_OE)
> + uap->port.icount.overrun++;
> +
> + ch &= uap->port.read_status_mask;
> +
> + if (ch & UART011_DR_BE)
> + flag = TTY_BREAK;
> + else if (ch & UART011_DR_PE)
> + flag = TTY_PARITY;
> + else if (ch & UART011_DR_FE)
> + flag = TTY_FRAME;
> + }
> +
> + if (uart_handle_sysrq_char(&uap->port, ch & 255))
> + goto ignore_char;
> +
> + uart_insert_char(&uap->port, ch, UART011_DR_OE, ch,
> flag);
> +
> +ignore_char:
> + status = readl(uap->port.membase + UART01x_FR);
> + }
> + spin_unlock(&uap->port.lock);
> + tty_flip_buffer_push(tty);
> + spin_lock(&uap->port.lock);
> +}
> +
> +static void pl011_tx_chars(struct uart_amba_port *uap)
> +{
> + struct circ_buf *xmit = &uap->port.state->xmit;
> + int count;
> +
> + if (uap->port.x_char) {
> + writel(uap->port.x_char, uap->port.membase +
> UART01x_DR);
> + uap->port.icount.tx++;
> + uap->port.x_char = 0;
> + return;
> + }
> + if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) {
> + pl011_stop_tx(&uap->port);
> + return;
> + }
> +
> + count = uap->port.fifosize >> 1;
> + do {
> + writel(xmit->buf[xmit->tail], uap->port.membase +
> UART01x_DR);
> + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
> + uap->port.icount.tx++;
> + if (uart_circ_empty(xmit))
> + break;
> + } while (--count > 0);
> +
> + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
> + uart_write_wakeup(&uap->port);
> +
> + if (uart_circ_empty(xmit))
> + pl011_stop_tx(&uap->port);
> +}
> +
> +static void pl011_modem_status(struct uart_amba_port *uap)
> +{
> + unsigned int status, delta;
> +
> + status = readl(uap->port.membase + UART01x_FR) &
> UART01x_FR_MODEM_ANY;
> +
> + delta = status ^ uap->old_status;
> + uap->old_status = status;
> +
> + if (!delta)
> + return;
> +
> + if (delta & UART01x_FR_DCD)
> + uart_handle_dcd_change(&uap->port, status &
> UART01x_FR_DCD);
> +
> + if (delta & UART01x_FR_DSR)
> + uap->port.icount.dsr++;
> +
> + if (delta & UART01x_FR_CTS)
> + uart_handle_cts_change(&uap->port, status &
> UART01x_FR_CTS);
> +
> + wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
> +}
> +
> +static irqreturn_t pl011_int(int irq, void *dev_id)
> +{
> + struct uart_amba_port *uap = dev_id;
> + unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
> + int handled = 0;
> +
> + spin_lock(&uap->port.lock);
> +
> + status = readl(uap->port.membase + UART011_MIS);
> + if (status) {
> + do {
> + writel(status & ~(UART011_TXIS|UART011_RTIS|
> + UART011_RXIS),
> + uap->port.membase + UART011_ICR);
> +
> + if (status & (UART011_RTIS|UART011_RXIS))
> + pl011_rx_chars(uap);
> + if (status & (UART011_DSRMIS|UART011_DCDMIS|
> + UART011_CTSMIS|UART011_RIMIS))
> + pl011_modem_status(uap);
> + if (status & UART011_TXIS)
> + pl011_tx_chars(uap);
> +
> + if (pass_counter-- == 0)
> + break;
> +
> + status = readl(uap->port.membase + UART011_MIS);
> + } while (status != 0);
> + handled = 1;
> + }
> +
> + spin_unlock(&uap->port.lock);
> +
> + return IRQ_RETVAL(handled);
> +}
> +
> +static unsigned int pl011_tx_empty(struct uart_port *port)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> + unsigned int status = readl(uap->port.membase + UART01x_FR);
> + return status & (UART01x_FR_BUSY|UART01x_FR_TXFF) ? 0 :
> TIOCSER_TEMT;
> +}
> +
> +static unsigned int pl011_get_mctrl(struct uart_port *port)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> + unsigned int result = 0;
> + unsigned int status = readl(uap->port.membase + UART01x_FR);
> +
> +#define TIOCMBIT(uartbit, tiocmbit) \
> + { \
> + if (status & uartbit) \
> + result |= tiocmbit; \
> + }
> +
> + TIOCMBIT(UART01x_FR_DCD, TIOCM_CAR)
> + TIOCMBIT(UART01x_FR_DSR, TIOCM_DSR)
> + TIOCMBIT(UART01x_FR_CTS, TIOCM_CTS)
> + TIOCMBIT(UART011_FR_RI, TIOCM_RNG)
> +#undef TIOCMBIT
> + return result;
> +}
> +
> +static void pl011_set_mctrl(struct uart_port *port, unsigned int mctrl)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> + unsigned int cr;
> +
> + cr = readl(uap->port.membase + UART011_CR);
> +
> +#define TIOCMBIT(tiocmbit, uartbit) \
> + do { \
> + if (mctrl & tiocmbit) \
> + cr |= uartbit; \
> + else \
> + cr &= ~uartbit; \
> + } while (0)
> +
> + TIOCMBIT(TIOCM_RTS, UART011_CR_RTS);
> + TIOCMBIT(TIOCM_DTR, UART011_CR_DTR);
> + TIOCMBIT(TIOCM_OUT1, UART011_CR_OUT1);
> + TIOCMBIT(TIOCM_OUT2, UART011_CR_OUT2);
> + TIOCMBIT(TIOCM_LOOP, UART011_CR_LBE);
> +#undef TIOCMBIT
> +
> + writel(cr, uap->port.membase + UART011_CR);
> +}
> +
> +static void pl011_break_ctl(struct uart_port *port, int break_state)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> + unsigned long flags;
> + unsigned int lcr_h;
> +
> + spin_lock_irqsave(&uap->port.lock, flags);
> + lcr_h = readl(uap->port.membase + UART011_LCRH);
> + if (break_state == -1)
> + lcr_h |= UART01x_LCRH_BRK;
> + else
> + lcr_h &= ~UART01x_LCRH_BRK;
> + writel(lcr_h, uap->port.membase + UART011_LCRH);
> + spin_unlock_irqrestore(&uap->port.lock, flags);
> +}
> +
> +#ifdef CONFIG_CONSOLE_POLL
> +static int pl011_get_poll_char(struct uart_port *port)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> + unsigned int status;
> +
> + do {
> + status = readl(uap->port.membase + UART01x_FR);
> + } while (status & UART01x_FR_RXFE);
> +
> + return readl(uap->port.membase + UART01x_DR);
> +}
> +
> +static void pl011_put_poll_char(struct uart_port *port,
> + unsigned char ch)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> +
> + while (readl(uap->port.membase + UART01x_FR) & UART01x_FR_TXFF)
> + barrier();
> +
> + writel(ch, uap->port.membase + UART01x_DR);
> +}
> +
> +#endif /** CONFIG_CONSOLE_POLL */
> +
> +static int pl011_startup(struct uart_port *port)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> + unsigned int cr;
> + int retval;
> +
> + uap->port.uartclk = UARTCLK;
> + /**
> + * Allocate the IRQ
> + */
> + retval = request_irq(uap->port.irq, pl011_int,
> + IRQF_DISABLED | IRQF_SHARED, "uart-pl011", uap);
> + if (retval)
> + goto out;
> +
> + writel(uap->ifls, uap->port.membase + UART011_IFLS);
> +
> + /**
> + * Provoke TX FIFO interrupt into asserting.
> + */
> + cr = UART01x_CR_UARTEN | UART011_CR_TXE | UART011_CR_LBE;
> + writel(cr, uap->port.membase + UART011_CR);
> + writel(0, uap->port.membase + UART011_FBRD);
> + writel(1, uap->port.membase + UART011_IBRD);
> + writel(0, uap->port.membase + UART011_LCRH);
> + writel(0, uap->port.membase + UART01x_DR);
> + while (readl(uap->port.membase + UART01x_FR) & UART01x_FR_BUSY)
> + barrier();
> +
> + cr = UART01x_CR_UARTEN | UART011_CR_RXE | UART011_CR_TXE;
> + writel(cr, uap->port.membase + UART011_CR);
> +
> + /**
> + * initialise the old status of the modem signals
> + */
> + uap->old_status =
> + readl(uap->port.membase + UART01x_FR) &
> UART01x_FR_MODEM_ANY;
> +
> + /**
> + * Finally, enable interrupts
> + */
> + spin_lock_irq(&uap->port.lock);
> + uap->im = UART011_RXIM | UART011_RTIM;
> + writel(uap->im, uap->port.membase + UART011_IMSC);
> + spin_unlock_irq(&uap->port.lock);
> +
> + return 0;
> +
> + out:
> + return retval;
> +}
> +
> +static void pl011_shutdown(struct uart_port *port)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> + unsigned long val;
> +
> + /**
> + * disable all interrupts
> + */
> + spin_lock_irq(&uap->port.lock);
> + uap->im = 0;
> + writel(uap->im, uap->port.membase + UART011_IMSC);
> + writel(0xffff, uap->port.membase + UART011_ICR);
> + spin_unlock_irq(&uap->port.lock);
> +
> + /**
> + * Free the interrupt
> + */
> + free_irq(uap->port.irq, uap);
> +
> + /**
> + * disable the port
> + */
> + writel(UART01x_CR_UARTEN |
> + UART011_CR_TXE, uap->port.membase + UART011_CR);
> +
> + /**
> + * disable break condition and fifos
> + */
> + val = readl(uap->port.membase + UART011_LCRH);
> + val &= ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN);
> + writel(val, uap->port.membase + UART011_LCRH);
> +}
> +
> +static void
> +pl011_set_termios(struct uart_port *port, struct ktermios *termios,
> + struct ktermios *old)
> +{
> + unsigned int lcr_h, old_cr;
> + unsigned long flags;
> + unsigned int baud, quot;
> +
> + /**
> + * Ask the core to calculate the divisor for us.
> + */
> + baud = uart_get_baud_rate(port, termios, old, 0,
> port->uartclk/16);
> + quot = port->uartclk * 4 / baud;
> +
> + switch (termios->c_cflag & CSIZE) {
> + case CS5:
> + lcr_h = UART01x_LCRH_WLEN_5;
> + break;
> + case CS6:
> + lcr_h = UART01x_LCRH_WLEN_6;
> + break;
> + case CS7:
> + lcr_h = UART01x_LCRH_WLEN_7;
> + break;
> + default:
> + lcr_h = UART01x_LCRH_WLEN_8;
> + break;
> + }
> + if (termios->c_cflag & CSTOPB)
> + lcr_h |= UART01x_LCRH_STP2;
> + if (termios->c_cflag & PARENB) {
> + lcr_h |= UART01x_LCRH_PEN;
> + if (!(termios->c_cflag & PARODD))
> + lcr_h |= UART01x_LCRH_EPS;
> + }
> + /** Enable hardware flow control*/
> + if (termios->c_cflag & CRTSCTS) {
> + if (*(int *)(port->private_data) == PL011_HWFC) {
> + lcr_h |= UART011_CR_CTSEN;
> + lcr_h |= UART011_CR_RTSEN;
> + }
> + }
> + if (port->fifosize > 1)
> + lcr_h |= UART01x_LCRH_FEN;
> +
> + spin_lock_irqsave(&port->lock, flags);
> +
> + /**
> + * Update the per-port timeout.
> + */
> + uart_update_timeout(port, termios->c_cflag, baud);
> +
> + port->read_status_mask = UART011_DR_OE | 255;
> + if (termios->c_iflag & INPCK)
> + port->read_status_mask |= UART011_DR_FE | UART011_DR_PE;
> + if (termios->c_iflag & (BRKINT | PARMRK))
> + port->read_status_mask |= UART011_DR_BE;
> +
> + /**
> + * Characters to ignore
> + */
> + port->ignore_status_mask = 0;
> + if (termios->c_iflag & IGNPAR)
> + port->ignore_status_mask |= UART011_DR_FE |
> UART011_DR_PE;
> + if (termios->c_iflag & IGNBRK) {
> + port->ignore_status_mask |= UART011_DR_BE;
> + /**
> + * If we're ignoring parity and break indicators,
> + * ignore overruns too (for real raw support).
> + */
> + if (termios->c_iflag & IGNPAR)
> + port->ignore_status_mask |= UART011_DR_OE;
> + }
> +
> + /**
> + * Ignore all characters if CREAD is not set.
> + */
> + if ((termios->c_cflag & CREAD) == 0)
> + port->ignore_status_mask |= UART_DUMMY_DR_RX;
> +
> + if (UART_ENABLE_MS(port, termios->c_cflag))
> + pl011_enable_ms(port);
> +
> + /** first, disable everything */
> + old_cr = readl(port->membase + UART011_CR);
> + writel(0, port->membase + UART011_CR);
> +
> + /** Set baud rate */
> + writel(quot & 0x3f, port->membase + UART011_FBRD);
> + writel(quot >> 6, port->membase + UART011_IBRD);
> +
> + /**
> + * ----------v----------v----------v----------v-----
> + * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
> + * ----------^----------^----------^----------^-----
> + */
> + writel(lcr_h, port->membase + UART011_LCRH);
> + writel(lcr_h, port->membase + 0x1c);
> + writel(old_cr, port->membase + UART011_CR);
> +
> + spin_unlock_irqrestore(&port->lock, flags);
> +}
> +
> +static const char *pl011_type(struct uart_port *port)
> +{
> + return port->type == PORT_AMBA ? "AMBA/PL011" : NULL;
> +}
> +
> +/**
> + * Release the memory region(s) being used by 'port'
> + */
> +static void pl011_release_port(struct uart_port *port)
> +{
> + release_mem_region(port->mapbase, SZ_4K);
> +}
> +
> +/**
> + * Request the memory region(s) being used by 'port'
> + */
> +static int pl011_request_port(struct uart_port *port)
> +{
> + return request_mem_region(port->mapbase, SZ_4K, "uart-pl011")
> + != NULL ? 0 : -EBUSY;
> +}
> +
> +/**
> + * Configure/autoconfigure the port.
> + */
> +static void pl011_config_port(struct uart_port *port, int flags)
> +{
> + if (flags & UART_CONFIG_TYPE) {
> + port->type = PORT_AMBA;
> + pl011_request_port(port);
> + }
> +}
> +
> +/**
> + * verify the new serial_struct (for TIOCSSERIAL).
> + */
> +static int pl011_verify_port(struct uart_port *port, struct
> serial_struct *ser)
> +{
> + int ret = 0;
> + if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
> + ret = -EINVAL;
> + if (ser->irq < 0 || ser->irq >= nr_irqs)
> + ret = -EINVAL;
> + if (ser->baud_base < 9600)
> + ret = -EINVAL;
> + return ret;
> +}
> +
> +static struct uart_ops pci_pl011_pops = {
> + .tx_empty = pl011_tx_empty,
> + .set_mctrl = pl011_set_mctrl,
> + .get_mctrl = pl011_get_mctrl,
> + .stop_tx = pl011_stop_tx,
> + .start_tx = pl011_start_tx,
> + .stop_rx = pl011_stop_rx,
> + .enable_ms = pl011_enable_ms,
> + .break_ctl = pl011_break_ctl,
> + .startup = pl011_startup,
> + .shutdown = pl011_shutdown,
> + .set_termios = pl011_set_termios,
> + .type = pl011_type,
> + .release_port = pl011_release_port,
> + .request_port = pl011_request_port,
> + .config_port = pl011_config_port,
> + .verify_port = pl011_verify_port,
> +#ifdef CONFIG_CONSOLE_POLL
> + .poll_get_char = pl011_get_poll_char,
> + .poll_put_char = pl011_put_poll_char,
> +#endif
> +};
> +
> +static struct uart_amba_port *amba_ports[UART_NR];
> +
> +#ifdef CONFIG_SERIAL_PCI_PL011_CONSOLE
> +
> +static void pl011_console_putchar(struct uart_port *port, int ch)
> +{
> + struct uart_amba_port *uap = (struct uart_amba_port *)port;
> +
> + while (readl(uap->port.membase + UART01x_FR) & UART01x_FR_TXFF)
> + barrier();
> + writel(ch, uap->port.membase + UART01x_DR);
> +}
> +
> +static void
> +pl011_console_write(struct console *co, const char *s, unsigned int
> count)
> +{
> + struct uart_amba_port *uap = amba_ports[co->index];
> + unsigned int status, old_cr, new_cr;
> + /**
> + * First save the CR then disable the interrupts
> + */
> + old_cr = readl(uap->port.membase + UART011_CR);
> + new_cr = old_cr & ~UART011_CR_CTSEN;
> + new_cr |= UART01x_CR_UARTEN | UART011_CR_TXE;
> + writel(new_cr, uap->port.membase + UART011_CR);
> +
> + uart_console_write(&uap->port, s, count, pl011_console_putchar);
> +
> + /**
> + * Finally, wait for transmitter to become empty
> + * and restore the TCR
> + */
> + do {
> + status = readl(uap->port.membase + UART01x_FR);
> + } while (status & UART01x_FR_BUSY);
> + writel(old_cr, uap->port.membase + UART011_CR);
> +}
> +
> +static void __init
> +pl011_console_get_options(struct uart_amba_port *uap, int *baud,
> + int *parity, int *bits)
> +{
> + if (readl(uap->port.membase + UART011_CR) & UART01x_CR_UARTEN) {
> + unsigned int lcr_h, iadapter, fadapter;
> +
> + lcr_h = readl(uap->port.membase + UART011_LCRH);
> +
> + *parity = 'n';
> + if (lcr_h & UART01x_LCRH_PEN) {
> + if (lcr_h & UART01x_LCRH_EPS)
> + *parity = 'e';
> + else
> + *parity = 'o';
> + }
> +
> + if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
> + *bits = 7;
> + else
> + *bits = 8;
> +
> + iadapter = readl(uap->port.membase + UART011_IBRD);
> + fadapter = readl(uap->port.membase + UART011_FBRD);
> +
> + *baud = uap->port.uartclk * 4 / (64 * iadapter +
> fadapter);
> + }
> +}
> +
> +static int __init pl011_console_setup(struct console *co, char
> *options)
> +{
> + struct uart_amba_port *uap;
> + int baud = 38400;
> + int bits = 8;
> + int parity = 'n';
> + int flow = 'n';
> +
> + /**
> + * Check whether an invalid uart number has been specified, and
> + * if so, search for the first available port that does have
> + * console support.
> + */
> + if (co->index >= UART_NR)
> + co->index = 0;
> + uap = amba_ports[co->index];
> + if (!uap)
> + return -ENODEV;
> + uap->port.uartclk = UARTCLK;
> + if (options)
> + uart_parse_options(options, &baud, &parity, &bits,
> &flow);
> + else
> + pl011_console_get_options(uap, &baud, &parity, &bits);
> +
> + return uart_set_options(&uap->port, co, baud, parity, bits,
> flow);
> +}
> +
> +static struct uart_driver pci_pl011_uart_driver;
> +static struct console amba_console = {
> + .name = "ttyAM",
> + .write = pl011_console_write,
> + .device = uart_console_device,
> + .setup = pl011_console_setup,
> + .flags = CON_PRINTBUFFER,
> + .index = -1,
> + .data = &pci_pl011_uart_driver,
> +};
> +
> +#define AMBA_CONSOLE (&amba_console)
> +#else
> +#define AMBA_CONSOLE NULL
> +#endif
> +
> +
> +static struct uart_driver pci_pl011_uart_driver = {
> + .owner = THIS_MODULE,
> + .driver_name = PCI_PL011_DRIVER_NAME,
> + .dev_name = "ttyAM",
> + .major = PCI_PL011_MAJOR,
> + .minor = PCI_PL011_MINOR_START,
> + .nr = UART_NR,
> + .cons = AMBA_CONSOLE,
> +};
> +
> +static int __devinit
> +pci_pl011_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> +{
> + int index, rc = 0;
> + struct pci_pl011_adapter *adapter, *tmp_adapter;
> + struct uart_amba_port *uap;
> + struct list_head *tmp;
> + int pci_pl011_adapter_count = 0;
> +
> + rc = pci_enable_device(pdev);
> + if (rc) {
> + dev_err(&pdev->dev, "Device enable FAILED\n");
> + goto out;
> + }
> +
> + rc = pci_request_regions(pdev, "pci_pl011");
> + if (rc) {
> + dev_err(&pdev->dev, "pci_request_region FAILED\n");
> + goto out_disable_device;
> + }
> +
> + pci_set_master(pdev);
> +
> + adapter = kzalloc(sizeof(struct pci_pl011_adapter), GFP_KERNEL);
> + if (!adapter) {
> + dev_err(&pdev->dev,
> + "memory allocation for adapter structure
> failed\n");
> + rc = -ENOMEM;
> + goto out_release_regions;
> + }
> + list_for_each(tmp, &pci_pl011_adapter_head) {
> + tmp_adapter = list_entry(tmp, struct pci_pl011_adapter,
> + pci_pl011_adapter_entry);
> + if (tmp_adapter->index != pci_pl011_adapter_count)
> + break;
> + pci_pl011_adapter_count++;
> + }
> + adapter->index = pci_pl011_adapter_count;
> + list_add_tail(&adapter->pci_pl011_adapter_entry, tmp);
> +
> + adapter->pci_dev = pdev;
> + if (pdev->device == PCI_DEVICE_ID_STMICRO_UART_HWFC)
> + adapter->type = PL011_HWFC;
> + else
> + adapter->type = PL011_NO_HWFC;
> + adapter->numb_ports = 1;
> +
> + spin_lock_init(&adapter->intr_lock);
> +
> + /** store which revision we have */
> + adapter->rev = pdev->revision;
> +
> + adapter->irq = pdev->irq;
> +
> + /** get the PCI Base Address Registers */
> + adapter->membase = pci_resource_start(pdev, 0);
> + adapter->membase_end = pci_resource_end(pdev, 0);
> +
> + if (adapter->membase & 1)
> + adapter->membase &= ~3;
> + else
> + adapter->membase &= ~15;
> +
> +
> + adapter->re_map_membase =
> + ioremap(adapter->membase, pci_resource_len(pdev, 0));
> + if (!adapter->re_map_membase) {
> + dev_err(&pdev->dev,
> + "Device has no PCI Memory resources, "
> + "failing adapter.\n");
> + rc = -ENOMEM;
> + goto out_kfree_adapter;
> + }
> +
> + for (index = 0; index < adapter->numb_ports; index++) {
> + uap = &adapter->port_info[index];
> + uap->port.uartclk = UARTCLK;
> + if (IS_ERR(uap->clk)) {
> + rc = PTR_ERR(uap->clk);
> + goto out_iounmap;
> + }
> +
> + uap->port.private_data = &adapter->type;
> + uap->port.mapbase = adapter->membase;
> + uap->port.membase = adapter->re_map_membase;
> + uap->port.iotype = UPIO_MEM;
> + uap->port.irq = adapter->irq;
> + uap->port.fifosize = vendor_st.fifosize;
> + uap->port.ops = &pci_pl011_pops;
> + uap->port.flags = UPF_BOOT_AUTOCONF;
> + uap->port.line = index + adapter->index *
> adapter->numb_ports;
> + if (uart_add_one_port(&pci_pl011_uart_driver,
> &uap->port))
> + printk(KERN_INFO "Added uart port Failed\n");
> + else
> + printk(KERN_INFO "Added uart port \n");
> + amba_ports[uap->port.line] = uap;
> + }
> +
> + /** Log the information about the adapter */
> + dev_info(&pdev->dev, "adapter %d: (rev %d), irq %d\n",
> + pci_pl011_adapter_count, adapter->rev,
> adapter->irq);
> +
> + pci_set_drvdata(pdev, adapter);
> +
> + return 0;
> +
> + out_iounmap:
> + iounmap(adapter->re_map_membase);
> + out_kfree_adapter:
> + kfree(adapter);
> + out_release_regions:
> + pci_release_regions(pdev);
> + out_disable_device:
> + pci_disable_device(pdev);
> + out:
> + return rc;
> +}
> +
> +static void __devexit pci_pl011_remove(struct pci_dev *pdev)
> +{
> + struct pci_pl011_adapter *adapter = pci_get_drvdata(pdev);
> + int i = 0;
> +
> +
> + for (i = 0; i < adapter->numb_ports; i++)
> + uart_remove_one_port(&pci_pl011_uart_driver,
> + &adapter->port_info[i].port);
> +
> + iounmap(adapter->re_map_membase);
> + pci_release_regions(pdev);
> + pci_disable_device(pdev);
> + list_del(&adapter->pci_pl011_adapter_entry);
> + kfree(adapter);
> +}
> +
> +static struct pci_device_id pci_pl011_pci_tbl[] = {
> + {
> + .vendor = PCI_VENDOR_ID_STMICRO,
> + .device = PCI_DEVICE_ID_STMICRO_UART_HWFC,
> + .subvendor = PCI_ANY_ID,
> + .subdevice = PCI_ANY_ID,
> + .driver_data = 0,
> + },
> + {
> + .vendor = PCI_VENDOR_ID_STMICRO,
> + .device = PCI_DEVICE_ID_STMICRO_UART_NO_HWFC,
> + .subvendor = PCI_ANY_ID,
> + .subdevice = PCI_ANY_ID,
> + .driver_data = 0,
> + },
> + { },
> +};
> +
> +static struct pci_driver pci_pl011_driver = {
> + .name = "pci_pl011",
> + .id_table = pci_pl011_pci_tbl,
> + .probe = pci_pl011_probe,
> + .remove = __devexit_p(pci_pl011_remove),
> +};
> +
> +static int __init pci_pl011_init(void)
> +{
> + int rc;
> +
> + printk(KERN_INFO "Serial: PCI PL011 UART driver\n");
> +
> + rc = uart_register_driver(&pci_pl011_uart_driver);
> + if (!rc) {
> + rc = pci_register_driver(&pci_pl011_driver);
> + if (rc)
> + uart_unregister_driver(&pci_pl011_uart_driver);
> + }
> + return rc;
> +}
> +
> +static void __exit pci_pl011_exit(void)
> +{
> + pci_unregister_driver(&pci_pl011_driver);
> + uart_unregister_driver(&pci_pl011_uart_driver);
> +}
> +
> +module_init(pci_pl011_init);
> +module_exit(pci_pl011_exit);
> +
> +MODULE_DESCRIPTION("Driver for the pl011 based on PCI");
> +MODULE_LICENSE("GPL");
> +MODULE_SUPPORTED_DEVICE("pl011-pci");
> +MODULE_VERSION(DRV_VERSION);
> --
> 1.6.0.4
> --
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