--- /dev/null
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Silicon Graphics, Inc. All Rights Reserved.
+ */
+
+/*
+ * This file contains a module version of the ioc3 serial driver. This
+ * includes all the support functions needed (support functions, etc.)
+ * and the serial driver itself.
+ */
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/circ_buf.h>
+#include <linux/serial_reg.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/serial_core.h>
+#include <linux/ioc3.h>
+#include <linux/slab.h>
+
+/*
+ * Interesting things about the ioc3
+ */
+
+#define LOGICAL_PORTS 2 /* rs232(0) and rs422(1) */
+#define PORTS_PER_CARD 2
+#define LOGICAL_PORTS_PER_CARD (PORTS_PER_CARD * LOGICAL_PORTS)
+#define MAX_CARDS 8
+#define MAX_LOGICAL_PORTS (LOGICAL_PORTS_PER_CARD * MAX_CARDS)
+
+/* determine given the sio_ir what port it applies to */
+#define GET_PORT_FROM_SIO_IR(_x) (_x & SIO_IR_SA) ? 0 : 1
+
+
+/*
+ * we have 2 logical ports (rs232, rs422) for each physical port
+ * evens are rs232, odds are rs422
+ */
+#define GET_PHYSICAL_PORT(_x) ((_x) >> 1)
+#define GET_LOGICAL_PORT(_x) ((_x) & 1)
+#define IS_PHYSICAL_PORT(_x) !((_x) & 1)
+#define IS_RS232(_x) !((_x) & 1)
+
+static unsigned int Num_of_ioc3_cards;
+static unsigned int Submodule_slot;
+
+/* defining this will get you LOTS of great debug info */
+//#define DEBUG_INTERRUPTS
+#define DPRINT_CONFIG(_x...) ;
+//#define DPRINT_CONFIG(_x...) printk _x
+#define NOT_PROGRESS() ;
+//#define NOT_PROGRESS() printk("%s : fails %d\n", __func__, __LINE__)
+
+/* number of characters we want to transmit to the lower level at a time */
+#define MAX_CHARS 256
+#define FIFO_SIZE (MAX_CHARS-1) /* it's a uchar */
+
+/* Device name we're using */
+#define DEVICE_NAME "ttySIOC"
+#define DEVICE_MAJOR 204
+#define DEVICE_MINOR 116
+
+/* flags for next_char_state */
+#define NCS_BREAK 0x1
+#define NCS_PARITY 0x2
+#define NCS_FRAMING 0x4
+#define NCS_OVERRUN 0x8
+
+/* cause we need SOME parameters ... */
+#define MIN_BAUD_SUPPORTED 1200
+#define MAX_BAUD_SUPPORTED 115200
+
+/* protocol types supported */
+#define PROTO_RS232 0
+#define PROTO_RS422 1
+
+/* Notification types */
+#define N_DATA_READY 0x01
+#define N_OUTPUT_LOWAT 0x02
+#define N_BREAK 0x04
+#define N_PARITY_ERROR 0x08
+#define N_FRAMING_ERROR 0x10
+#define N_OVERRUN_ERROR 0x20
+#define N_DDCD 0x40
+#define N_DCTS 0x80
+
+#define N_ALL_INPUT (N_DATA_READY | N_BREAK \
+ | N_PARITY_ERROR | N_FRAMING_ERROR \
+ | N_OVERRUN_ERROR | N_DDCD | N_DCTS)
+
+#define N_ALL_OUTPUT N_OUTPUT_LOWAT
+
+#define N_ALL_ERRORS (N_PARITY_ERROR | N_FRAMING_ERROR \
+ | N_OVERRUN_ERROR)
+
+#define N_ALL (N_DATA_READY | N_OUTPUT_LOWAT | N_BREAK \
+ | N_PARITY_ERROR | N_FRAMING_ERROR \
+ | N_OVERRUN_ERROR | N_DDCD | N_DCTS)
+
+#define SER_CLK_SPEED(prediv) ((22000000 << 1) / prediv)
+#define SER_DIVISOR(x, clk) (((clk) + (x) * 8) / ((x) * 16))
+#define DIVISOR_TO_BAUD(div, clk) ((clk) / 16 / (div))
+
+/* Some masks */
+#define LCR_MASK_BITS_CHAR (UART_LCR_WLEN5 | UART_LCR_WLEN6 \
+ | UART_LCR_WLEN7 | UART_LCR_WLEN8)
+#define LCR_MASK_STOP_BITS (UART_LCR_STOP)
+
+#define PENDING(_a, _p) (readl(&(_p)->vma->sio_ir) & (_a)->ic_enable)
+
+#define RING_BUF_SIZE 4096
+#define BUF_SIZE_BIT SBBR_L_SIZE
+#define PROD_CONS_MASK PROD_CONS_PTR_4K
+
+#define TOTAL_RING_BUF_SIZE (RING_BUF_SIZE * 4)
+
+/* driver specific - one per card */
+struct ioc3_card {
+ struct {
+ /* uart ports are allocated here */
+ struct uart_port icp_uart_port[LOGICAL_PORTS];
+ /* the ioc3_port used for this port */
+ struct ioc3_port *icp_port;
+ } ic_port[PORTS_PER_CARD];
+ /* currently enabled interrupts */
+ uint32_t ic_enable;
+};
+
+/* Local port info for each IOC3 serial port */
+struct ioc3_port {
+ /* handy reference material */
+ struct uart_port *ip_port;
+ struct ioc3_card *ip_card;
+ struct ioc3_driver_data *ip_idd;
+ struct ioc3_submodule *ip_is;
+
+ /* pci mem addresses for this port */
+ struct ioc3_serialregs __iomem *ip_serial_regs;
+ struct ioc3_uartregs __iomem *ip_uart_regs;
+
+ /* Ring buffer page for this port */
+ dma_addr_t ip_dma_ringbuf;
+ /* vaddr of ring buffer */
+ struct ring_buffer *ip_cpu_ringbuf;
+
+ /* Rings for this port */
+ struct ring *ip_inring;
+ struct ring *ip_outring;
+
+ /* Hook to port specific values */
+ struct port_hooks *ip_hooks;
+
+ spinlock_t ip_lock;
+
+ /* Various rx/tx parameters */
+ int ip_baud;
+ int ip_tx_lowat;
+ int ip_rx_timeout;
+
+ /* Copy of notification bits */
+ int ip_notify;
+
+ /* Shadow copies of various registers so we don't need to PIO
+ * read them constantly
+ */
+ uint32_t ip_sscr;
+ uint32_t ip_tx_prod;
+ uint32_t ip_rx_cons;
+ unsigned char ip_flags;
+};
+
+/* tx low water mark. We need to notify the driver whenever tx is getting
+ * close to empty so it can refill the tx buffer and keep things going.
+ * Let's assume that if we interrupt 1 ms before the tx goes idle, we'll
+ * have no trouble getting in more chars in time (I certainly hope so).
+ */
+#define TX_LOWAT_LATENCY 1000
+#define TX_LOWAT_HZ (1000000 / TX_LOWAT_LATENCY)
+#define TX_LOWAT_CHARS(baud) (baud / 10 / TX_LOWAT_HZ)
+
+/* Flags per port */
+#define INPUT_HIGH 0x01
+ /* used to signify that we have turned off the rx_high
+ * temporarily - we need to drain the fifo and don't
+ * want to get blasted with interrupts.
+ */
+#define DCD_ON 0x02
+ /* DCD state is on */
+#define LOWAT_WRITTEN 0x04
+#define READ_ABORTED 0x08
+ /* the read was aborted - used to avaoid infinate looping
+ * in the interrupt handler
+ */
+#define INPUT_ENABLE 0x10
+
+/* Since each port has different register offsets and bitmasks
+ * for everything, we'll store those that we need in tables so we
+ * don't have to be constantly checking the port we are dealing with.
+ */
+struct port_hooks {
+ uint32_t intr_delta_dcd;
+ uint32_t intr_delta_cts;
+ uint32_t intr_tx_mt;
+ uint32_t intr_rx_timer;
+ uint32_t intr_rx_high;
+ uint32_t intr_tx_explicit;
+ uint32_t intr_clear;
+ uint32_t intr_all;
+ char rs422_select_pin;
+};
+
+static struct port_hooks hooks_array[PORTS_PER_CARD] = {
+ /* values for port A */
+ {
+ .intr_delta_dcd = SIO_IR_SA_DELTA_DCD,
+ .intr_delta_cts = SIO_IR_SA_DELTA_CTS,
+ .intr_tx_mt = SIO_IR_SA_TX_MT,
+ .intr_rx_timer = SIO_IR_SA_RX_TIMER,
+ .intr_rx_high = SIO_IR_SA_RX_HIGH,
+ .intr_tx_explicit = SIO_IR_SA_TX_EXPLICIT,
+ .intr_clear = (SIO_IR_SA_TX_MT | SIO_IR_SA_RX_FULL
+ | SIO_IR_SA_RX_HIGH
+ | SIO_IR_SA_RX_TIMER
+ | SIO_IR_SA_DELTA_DCD
+ | SIO_IR_SA_DELTA_CTS
+ | SIO_IR_SA_INT
+ | SIO_IR_SA_TX_EXPLICIT
+ | SIO_IR_SA_MEMERR),
+ .intr_all = SIO_IR_SA,
+ .rs422_select_pin = GPPR_UARTA_MODESEL_PIN,
+ },
+
+ /* values for port B */
+ {
+ .intr_delta_dcd = SIO_IR_SB_DELTA_DCD,
+ .intr_delta_cts = SIO_IR_SB_DELTA_CTS,
+ .intr_tx_mt = SIO_IR_SB_TX_MT,
+ .intr_rx_timer = SIO_IR_SB_RX_TIMER,
+ .intr_rx_high = SIO_IR_SB_RX_HIGH,
+ .intr_tx_explicit = SIO_IR_SB_TX_EXPLICIT,
+ .intr_clear = (SIO_IR_SB_TX_MT | SIO_IR_SB_RX_FULL
+ | SIO_IR_SB_RX_HIGH
+ | SIO_IR_SB_RX_TIMER
+ | SIO_IR_SB_DELTA_DCD
+ | SIO_IR_SB_DELTA_CTS
+ | SIO_IR_SB_INT
+ | SIO_IR_SB_TX_EXPLICIT
+ | SIO_IR_SB_MEMERR),
+ .intr_all = SIO_IR_SB,
+ .rs422_select_pin = GPPR_UARTB_MODESEL_PIN,
+ }
+};
+
+struct ring_entry {
+ union {
+ struct {
+ uint32_t alldata;
+ uint32_t allsc;
+ } all;
+ struct {
+ char data[4]; /* data bytes */
+ char sc[4]; /* status/control */
+ } s;
+ } u;
+};
+
+/* Test the valid bits in any of the 4 sc chars using "allsc" member */
+#define RING_ANY_VALID \
+ ((uint32_t)(RXSB_MODEM_VALID | RXSB_DATA_VALID) * 0x01010101)
+
+#define ring_sc u.s.sc
+#define ring_data u.s.data
+#define ring_allsc u.all.allsc
+
+/* Number of entries per ring buffer. */
+#define ENTRIES_PER_RING (RING_BUF_SIZE / (int) sizeof(struct ring_entry))
+
+/* An individual ring */
+struct ring {
+ struct ring_entry entries[ENTRIES_PER_RING];
+};
+
+/* The whole enchilada */
+struct ring_buffer {
+ struct ring TX_A;
+ struct ring RX_A;
+ struct ring TX_B;
+ struct ring RX_B;
+};
+
+/* Get a ring from a port struct */
+#define RING(_p, _wh) &(((struct ring_buffer *)((_p)->ip_cpu_ringbuf))->_wh)
+
+/* for Infinite loop detection */
+#define MAXITER 10000000
+
+
+/**
+ * set_baud - Baud rate setting code
+ * @port: port to set
+ * @baud: baud rate to use
+ */
+static int set_baud(struct ioc3_port *port, int baud)
+{
+ int divisor;
+ int actual_baud;
+ int diff;
+ int lcr, prediv;
+ struct ioc3_uartregs __iomem *uart;
+
+ for (prediv = 6; prediv < 64; prediv++) {
+ divisor = SER_DIVISOR(baud, SER_CLK_SPEED(prediv));
+ if (!divisor)
+ continue; /* invalid divisor */
+ actual_baud = DIVISOR_TO_BAUD(divisor, SER_CLK_SPEED(prediv));
+
+ diff = actual_baud - baud;
+ if (diff < 0)
+ diff = -diff;
+
+ /* if we're within 1% we've found a match */
+ if (diff * 100 <= actual_baud)
+ break;
+ }
+
+ /* if the above loop completed, we didn't match
+ * the baud rate. give up.
+ */
+ if (prediv == 64) {
+ NOT_PROGRESS();
+ return 1;
+ }
+
+ uart = port->ip_uart_regs;
+ lcr = readb(&uart->iu_lcr);
+
+ writeb(lcr | UART_LCR_DLAB, &uart->iu_lcr);
+ writeb((unsigned char)divisor, &uart->iu_dll);
+ writeb((unsigned char)(divisor >> 8), &uart->iu_dlm);
+ writeb((unsigned char)prediv, &uart->iu_scr);
+ writeb((unsigned char)lcr, &uart->iu_lcr);
+
+ return 0;
+}
+
+/**
+ * get_ioc3_port - given a uart port, return the control structure
+ * @the_port: uart port to find
+ */
+static struct ioc3_port *get_ioc3_port(struct uart_port *the_port)
+{
+ struct ioc3_driver_data *idd = dev_get_drvdata(the_port->dev);
+ struct ioc3_card *card_ptr = idd->data[Submodule_slot];
+ int ii, jj;
+
+ if (!card_ptr) {
+ NOT_PROGRESS();
+ return NULL;
+ }
+ for (ii = 0; ii < PORTS_PER_CARD; ii++) {
+ for (jj = 0; jj < LOGICAL_PORTS; jj++) {
+ if (the_port == &card_ptr->ic_port[ii].icp_uart_port[jj])
+ return card_ptr->ic_port[ii].icp_port;
+ }
+ }
+ NOT_PROGRESS();
+ return NULL;
+}
+
+/**
+ * port_init - Initialize the sio and ioc3 hardware for a given port
+ * called per port from attach...
+ * @port: port to initialize
+ */
+static int inline port_init(struct ioc3_port *port)
+{
+ uint32_t sio_cr;
+ struct port_hooks *hooks = port->ip_hooks;
+ struct ioc3_uartregs __iomem *uart;
+ int reset_loop_counter = 0xfffff;
+ struct ioc3_driver_data *idd = port->ip_idd;
+
+ /* Idle the IOC3 serial interface */
+ writel(SSCR_RESET, &port->ip_serial_regs->sscr);
+
+ /* Wait until any pending bus activity for this port has ceased */
+ do {
+ sio_cr = readl(&idd->vma->sio_cr);
+ if (reset_loop_counter-- <= 0) {
+ printk(KERN_WARNING
+ "IOC3 unable to come out of reset"
+ " scr 0x%x\n", sio_cr);
+ return -1;
+ }
+ } while (!(sio_cr & SIO_CR_ARB_DIAG_IDLE) &&
+ (((sio_cr &= SIO_CR_ARB_DIAG) == SIO_CR_ARB_DIAG_TXA)
+ || sio_cr == SIO_CR_ARB_DIAG_TXB
+ || sio_cr == SIO_CR_ARB_DIAG_RXA
+ || sio_cr == SIO_CR_ARB_DIAG_RXB));
+
+ /* Finish reset sequence */
+ writel(0, &port->ip_serial_regs->sscr);
+
+ /* Once RESET is done, reload cached tx_prod and rx_cons values
+ * and set rings to empty by making prod == cons
+ */
+ port->ip_tx_prod = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
+ writel(port->ip_tx_prod, &port->ip_serial_regs->stpir);
+ port->ip_rx_cons = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
+ writel(port->ip_rx_cons | SRCIR_ARM, &port->ip_serial_regs->srcir);
+
+ /* Disable interrupts for this 16550 */
+ uart = port->ip_uart_regs;
+ writeb(0, &uart->iu_lcr);
+ writeb(0, &uart->iu_ier);
+
+ /* Set the default baud */
+ set_baud(port, port->ip_baud);
+
+ /* Set line control to 8 bits no parity */
+ writeb(UART_LCR_WLEN8 | 0, &uart->iu_lcr);
+ /* UART_LCR_STOP == 1 stop */
+
+ /* Enable the FIFOs */
+ writeb(UART_FCR_ENABLE_FIFO, &uart->iu_fcr);
+ /* then reset 16550 FIFOs */
+ writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+ &uart->iu_fcr);
+
+ /* Clear modem control register */
+ writeb(0, &uart->iu_mcr);
+
+ /* Clear deltas in modem status register */
+ writel(0, &port->ip_serial_regs->shadow);
+
+ /* Only do this once per port pair */
+ if (port->ip_hooks == &hooks_array[0]) {
+ unsigned long ring_pci_addr;
+ uint32_t __iomem *sbbr_l, *sbbr_h;
+
+ sbbr_l = &idd->vma->sbbr_l;
+ sbbr_h = &idd->vma->sbbr_h;
+ ring_pci_addr = (unsigned long __iomem)port->ip_dma_ringbuf;
+ DPRINT_CONFIG(("%s: ring_pci_addr 0x%p\n",
+ __func__, (void *)ring_pci_addr));
+
+ writel((unsigned int)((uint64_t) ring_pci_addr >> 32), sbbr_h);
+ writel((unsigned int)ring_pci_addr | BUF_SIZE_BIT, sbbr_l);
+ }
+
+ /* Set the receive timeout value to 10 msec */
+ writel(SRTR_HZ / 100, &port->ip_serial_regs->srtr);
+
+ /* Set rx threshold, enable DMA */
+ /* Set high water mark at 3/4 of full ring */
+ port->ip_sscr = (ENTRIES_PER_RING * 3 / 4);
+
+ /* uart experiences pauses at high baud rate reducing actual
+ * throughput by 10% or so unless we enable high speed polling
+ * XXX when this hardware bug is resolved we should revert to
+ * normal polling speed
+ */
+ port->ip_sscr |= SSCR_HIGH_SPD;
+
+ writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+
+ /* Disable and clear all serial related interrupt bits */
+ port->ip_card->ic_enable &= ~hooks->intr_clear;
+ ioc3_disable(port->ip_is, idd, hooks->intr_clear);
+ ioc3_ack(port->ip_is, idd, hooks->intr_clear);
+ return 0;
+}
+
+/**
+ * enable_intrs - enable interrupts
+ * @port: port to enable
+ * @mask: mask to use
+ */
+static void enable_intrs(struct ioc3_port *port, uint32_t mask)
+{
+ if ((port->ip_card->ic_enable & mask) != mask) {
+ port->ip_card->ic_enable |= mask;
+ ioc3_enable(port->ip_is, port->ip_idd, mask);
+ }
+}
+
+/**
+ * local_open - local open a port
+ * @port: port to open
+ */
+static inline int local_open(struct ioc3_port *port)
+{
+ int spiniter = 0;
+
+ port->ip_flags = INPUT_ENABLE;
+
+ /* Pause the DMA interface if necessary */
+ if (port->ip_sscr & SSCR_DMA_EN) {
+ writel(port->ip_sscr | SSCR_DMA_PAUSE,
+ &port->ip_serial_regs->sscr);
+ while ((readl(&port->ip_serial_regs->sscr)
+ & SSCR_PAUSE_STATE) == 0) {
+ spiniter++;
+ if (spiniter > MAXITER) {
+ NOT_PROGRESS();
+ return -1;
+ }
+ }
+ }
+
+ /* Reset the input fifo. If the uart received chars while the port
+ * was closed and DMA is not enabled, the uart may have a bunch of
+ * chars hanging around in its rx fifo which will not be discarded
+ * by rclr in the upper layer. We must get rid of them here.
+ */
+ writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR,
+ &port->ip_uart_regs->iu_fcr);
+
+ writeb(UART_LCR_WLEN8, &port->ip_uart_regs->iu_lcr);
+ /* UART_LCR_STOP == 1 stop */
+
+ /* Re-enable DMA, set default threshold to intr whenever there is
+ * data available.
+ */
+ port->ip_sscr &= ~SSCR_RX_THRESHOLD;
+ port->ip_sscr |= 1; /* default threshold */
+
+ /* Plug in the new sscr. This implicitly clears the DMA_PAUSE
+ * flag if it was set above
+ */
+ writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+ port->ip_tx_lowat = 1;
+ return 0;
+}
+
+/**
+ * set_rx_timeout - Set rx timeout and threshold values.
+ * @port: port to use
+ * @timeout: timeout value in ticks
+ */
+static inline int set_rx_timeout(struct ioc3_port *port, int timeout)
+{
+ int threshold;
+
+ port->ip_rx_timeout = timeout;
+
+ /* Timeout is in ticks. Let's figure out how many chars we
+ * can receive at the current baud rate in that interval
+ * and set the rx threshold to that amount. There are 4 chars
+ * per ring entry, so we'll divide the number of chars that will
+ * arrive in timeout by 4.
+ * So .... timeout * baud / 10 / HZ / 4, with HZ = 100.
+ */
+ threshold = timeout * port->ip_baud / 4000;
+ if (threshold == 0)
+ threshold = 1; /* otherwise we'll intr all the time! */
+
+ if ((unsigned)threshold > (unsigned)SSCR_RX_THRESHOLD)
+ return 1;
+
+ port->ip_sscr &= ~SSCR_RX_THRESHOLD;
+ port->ip_sscr |= threshold;
+ writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+
+ /* Now set the rx timeout to the given value
+ * again timeout * SRTR_HZ / HZ
+ */
+ timeout = timeout * SRTR_HZ / 100;
+ if (timeout > SRTR_CNT)
+ timeout = SRTR_CNT;
+ writel(timeout, &port->ip_serial_regs->srtr);
+ return 0;
+}
+
+/**
+ * config_port - config the hardware
+ * @port: port to config
+ * @baud: baud rate for the port
+ * @byte_size: data size
+ * @stop_bits: number of stop bits
+ * @parenb: parity enable ?
+ * @parodd: odd parity ?
+ */
+static inline int
+config_port(struct ioc3_port *port,
+ int baud, int byte_size, int stop_bits, int parenb, int parodd)
+{
+ char lcr, sizebits;
+ int spiniter = 0;
+
+ DPRINT_CONFIG(("%s: line %d baud %d byte_size %d stop %d parenb %d "
+ "parodd %d\n",
+ __func__, ((struct uart_port *)port->ip_port)->line,
+ baud, byte_size, stop_bits, parenb, parodd));
+
+ if (set_baud(port, baud))
+ return 1;
+
+ switch (byte_size) {
+ case 5:
+ sizebits = UART_LCR_WLEN5;
+ break;
+ case 6:
+ sizebits = UART_LCR_WLEN6;
+ break;
+ case 7:
+ sizebits = UART_LCR_WLEN7;
+ break;
+ case 8:
+ sizebits = UART_LCR_WLEN8;
+ break;
+ default:
+ return 1;
+ }
+
+ /* Pause the DMA interface if necessary */
+ if (port->ip_sscr & SSCR_DMA_EN) {
+ writel(port->ip_sscr | SSCR_DMA_PAUSE,
+ &port->ip_serial_regs->sscr);
+ while ((readl(&port->ip_serial_regs->sscr)
+ & SSCR_PAUSE_STATE) == 0) {
+ spiniter++;
+ if (spiniter > MAXITER)
+ return -1;
+ }
+ }
+
+ /* Clear relevant fields in lcr */
+ lcr = readb(&port->ip_uart_regs->iu_lcr);
+ lcr &= ~(LCR_MASK_BITS_CHAR | UART_LCR_EPAR |
+ UART_LCR_PARITY | LCR_MASK_STOP_BITS);
+
+ /* Set byte size in lcr */
+ lcr |= sizebits;
+
+ /* Set parity */
+ if (parenb) {
+ lcr |= UART_LCR_PARITY;
+ if (!parodd)
+ lcr |= UART_LCR_EPAR;
+ }
+
+ /* Set stop bits */
+ if (stop_bits)
+ lcr |= UART_LCR_STOP /* 2 stop bits */ ;
+
+ writeb(lcr, &port->ip_uart_regs->iu_lcr);
+
+ /* Re-enable the DMA interface if necessary */
+ if (port->ip_sscr & SSCR_DMA_EN) {
+ writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+ }
+ port->ip_baud = baud;
+
+ /* When we get within this number of ring entries of filling the
+ * entire ring on tx, place an EXPLICIT intr to generate a lowat
+ * notification when output has drained.
+ */
+ port->ip_tx_lowat = (TX_LOWAT_CHARS(baud) + 3) / 4;
+ if (port->ip_tx_lowat == 0)
+ port->ip_tx_lowat = 1;
+
+ set_rx_timeout(port, 2);
+ return 0;
+}
+
+/**
+ * do_write - Write bytes to the port. Returns the number of bytes
+ * actually written. Called from transmit_chars
+ * @port: port to use
+ * @buf: the stuff to write
+ * @len: how many bytes in 'buf'
+ */
+static inline int do_write(struct ioc3_port *port, char *buf, int len)
+{
+ int prod_ptr, cons_ptr, total = 0;
+ struct ring *outring;
+ struct ring_entry *entry;
+ struct port_hooks *hooks = port->ip_hooks;
+
+ BUG_ON(!(len >= 0));
+
+ prod_ptr = port->ip_tx_prod;
+ cons_ptr = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
+ outring = port->ip_outring;
+
+ /* Maintain a 1-entry red-zone. The ring buffer is full when
+ * (cons - prod) % ring_size is 1. Rather than do this subtraction
+ * in the body of the loop, I'll do it now.
+ */
+ cons_ptr = (cons_ptr - (int)sizeof(struct ring_entry)) & PROD_CONS_MASK;
+
+ /* Stuff the bytes into the output */
+ while ((prod_ptr != cons_ptr) && (len > 0)) {
+ int xx;
+
+ /* Get 4 bytes (one ring entry) at a time */
+ entry = (struct ring_entry *)((caddr_t) outring + prod_ptr);
+
+ /* Invalidate all entries */
+ entry->ring_allsc = 0;
+
+ /* Copy in some bytes */
+ for (xx = 0; (xx < 4) && (len > 0); xx++) {
+ entry->ring_data[xx] = *buf++;
+ entry->ring_sc[xx] = TXCB_VALID;
+ len--;
+ total++;
+ }
+
+ /* If we are within some small threshold of filling up the
+ * entire ring buffer, we must place an EXPLICIT intr here
+ * to generate a lowat interrupt in case we subsequently
+ * really do fill up the ring and the caller goes to sleep.
+ * No need to place more than one though.
+ */
+ if (!(port->ip_flags & LOWAT_WRITTEN) &&
+ ((cons_ptr - prod_ptr) & PROD_CONS_MASK)
+ <= port->ip_tx_lowat * (int)sizeof(struct ring_entry)) {
+ port->ip_flags |= LOWAT_WRITTEN;
+ entry->ring_sc[0] |= TXCB_INT_WHEN_DONE;
+ }
+
+ /* Go on to next entry */
+ prod_ptr += sizeof(struct ring_entry);
+ prod_ptr &= PROD_CONS_MASK;
+ }
+
+ /* If we sent something, start DMA if necessary */
+ if (total > 0 && !(port->ip_sscr & SSCR_DMA_EN)) {
+ port->ip_sscr |= SSCR_DMA_EN;
+ writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+ }
+
+ /* Store the new producer pointer. If tx is disabled, we stuff the
+ * data into the ring buffer, but we don't actually start tx.
+ */
+ if (!uart_tx_stopped(port->ip_port)) {
+ writel(prod_ptr, &port->ip_serial_regs->stpir);
+
+ /* If we are now transmitting, enable tx_mt interrupt so we
+ * can disable DMA if necessary when the tx finishes.
+ */
+ if (total > 0)
+ enable_intrs(port, hooks->intr_tx_mt);
+ }
+ port->ip_tx_prod = prod_ptr;
+
+ return total;
+}
+
+/**
+ * disable_intrs - disable interrupts
+ * @port: port to enable
+ * @mask: mask to use
+ */
+static inline void disable_intrs(struct ioc3_port *port, uint32_t mask)
+{
+ if (port->ip_card->ic_enable & mask) {
+ ioc3_disable(port->ip_is, port->ip_idd, mask);
+ port->ip_card->ic_enable &= ~mask;
+ }
+}
+
+/**
+ * set_notification - Modify event notification
+ * @port: port to use
+ * @mask: events mask
+ * @set_on: set ?
+ */
+static int set_notification(struct ioc3_port *port, int mask, int set_on)
+{
+ struct port_hooks *hooks = port->ip_hooks;
+ uint32_t intrbits, sscrbits;
+
+ BUG_ON(!mask);
+
+ intrbits = sscrbits = 0;
+
+ if (mask & N_DATA_READY)
+ intrbits |= (hooks->intr_rx_timer | hooks->intr_rx_high);
+ if (mask & N_OUTPUT_LOWAT)
+ intrbits |= hooks->intr_tx_explicit;
+ if (mask & N_DDCD) {
+ intrbits |= hooks->intr_delta_dcd;
+ sscrbits |= SSCR_RX_RING_DCD;
+ }
+ if (mask & N_DCTS)
+ intrbits |= hooks->intr_delta_cts;
+
+ if (set_on) {
+ enable_intrs(port, intrbits);
+ port->ip_notify |= mask;
+ port->ip_sscr |= sscrbits;
+ } else {
+ disable_intrs(port, intrbits);
+ port->ip_notify &= ~mask;
+ port->ip_sscr &= ~sscrbits;
+ }
+
+ /* We require DMA if either DATA_READY or DDCD notification is
+ * currently requested. If neither of these is requested and
+ * there is currently no tx in progress, DMA may be disabled.
+ */
+ if (port->ip_notify & (N_DATA_READY | N_DDCD))
+ port->ip_sscr |= SSCR_DMA_EN;
+ else if (!(port->ip_card->ic_enable & hooks->intr_tx_mt))
+ port->ip_sscr &= ~SSCR_DMA_EN;
+
+ writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+ return 0;
+}
+
+/**
+ * set_mcr - set the master control reg
+ * @the_port: port to use
+ * @mask1: mcr mask
+ * @mask2: shadow mask
+ */
+static inline int set_mcr(struct uart_port *the_port,
+ int mask1, int mask2)
+{
+ struct ioc3_port *port = get_ioc3_port(the_port);
+ uint32_t shadow;
+ int spiniter = 0;
+ char mcr;
+
+ if (!port)
+ return -1;
+
+ /* Pause the DMA interface if necessary */
+ if (port->ip_sscr & SSCR_DMA_EN) {
+ writel(port->ip_sscr | SSCR_DMA_PAUSE,
+ &port->ip_serial_regs->sscr);
+ while ((readl(&port->ip_serial_regs->sscr)
+ & SSCR_PAUSE_STATE) == 0) {
+ spiniter++;
+ if (spiniter > MAXITER)
+ return -1;
+ }
+ }
+ shadow = readl(&port->ip_serial_regs->shadow);
+ mcr = (shadow & 0xff000000) >> 24;
+
+ /* Set new value */
+ mcr |= mask1;
+ shadow |= mask2;
+ writeb(mcr, &port->ip_uart_regs->iu_mcr);
+ writel(shadow, &port->ip_serial_regs->shadow);
+
+ /* Re-enable the DMA interface if necessary */
+ if (port->ip_sscr & SSCR_DMA_EN) {
+ writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+ }
+ return 0;
+}
+
+/**
+ * ioc3_set_proto - set the protocol for the port
+ * @port: port to use
+ * @proto: protocol to use
+ */
+static int ioc3_set_proto(struct ioc3_port *port, int proto)
+{
+ struct port_hooks *hooks = port->ip_hooks;
+
+ switch (proto) {
+ default:
+ case PROTO_RS232:
+ /* Clear the appropriate GIO pin */
+ DPRINT_CONFIG(("%s: rs232\n", __func__));
+ writel(0, (&port->ip_idd->vma->gppr[0]
+ + hooks->rs422_select_pin));
+ break;
+
+ case PROTO_RS422:
+ /* Set the appropriate GIO pin */
+ DPRINT_CONFIG(("%s: rs422\n", __func__));
+ writel(1, (&port->ip_idd->vma->gppr[0]
+ + hooks->rs422_select_pin));
+ break;
+ }
+ return 0;
+}
+
+/**
+ * transmit_chars - upper level write, called with the_port->lock
+ * @the_port: port to write
+ */
+static void transmit_chars(struct uart_port *the_port)
+{
+ int xmit_count, tail, head;
+ int result;
+ char *start;
+ struct tty_struct *tty;
+ struct ioc3_port *port = get_ioc3_port(the_port);
+ struct uart_state *state;
+
+ if (!the_port)
+ return;
+ if (!port)
+ return;
+
+ state = the_port->state;
+ tty = state->port.tty;
+
+ if (uart_circ_empty(&state->xmit) || uart_tx_stopped(the_port)) {
+ /* Nothing to do or hw stopped */
+ set_notification(port, N_ALL_OUTPUT, 0);
+ return;
+ }
+
+ head = state->xmit.head;
+ tail = state->xmit.tail;
+ start = (char *)&state->xmit.buf[tail];
+
+ /* write out all the data or until the end of the buffer */
+ xmit_count = (head < tail) ? (UART_XMIT_SIZE - tail) : (head - tail);
+ if (xmit_count > 0) {
+ result = do_write(port, start, xmit_count);
+ if (result > 0) {
+ /* booking */
+ xmit_count -= result;
+ the_port->icount.tx += result;
+ /* advance the pointers */
+ tail += result;
+ tail &= UART_XMIT_SIZE - 1;
+ state->xmit.tail = tail;
+ start = (char *)&state->xmit.buf[tail];
+ }
+ }
+ if (uart_circ_chars_pending(&state->xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(the_port);
+
+ if (uart_circ_empty(&state->xmit)) {
+ set_notification(port, N_OUTPUT_LOWAT, 0);
+ } else {
+ set_notification(port, N_OUTPUT_LOWAT, 1);
+ }
+}
+
+/**
+ * ioc3_change_speed - change the speed of the port
+ * @the_port: port to change
+ * @new_termios: new termios settings
+ * @old_termios: old termios settings
+ */
+static void
+ioc3_change_speed(struct uart_port *the_port,
+ struct ktermios *new_termios, struct ktermios *old_termios)
+{
+ struct ioc3_port *port = get_ioc3_port(the_port);
+ unsigned int cflag, iflag;
+ int baud;
+ int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
+ struct uart_state *state = the_port->state;
+
+ cflag = new_termios->c_cflag;
+ iflag = new_termios->c_iflag;
+
+ switch (cflag & CSIZE) {
+ case CS5:
+ new_data = 5;
+ break;
+ case CS6:
+ new_data = 6;
+ break;
+ case CS7:
+ new_data = 7;
+ break;
+ case CS8:
+ new_data = 8;
+ break;
+ default:
+ /* cuz we always need a default ... */
+ new_data = 5;
+ break;
+ }
+ if (cflag & CSTOPB) {
+ new_stop = 1;
+ }
+ if (cflag & PARENB) {
+ new_parity_enable = 1;
+ if (cflag & PARODD)
+ new_parity = 1;
+ }
+ baud = uart_get_baud_rate(the_port, new_termios, old_termios,
+ MIN_BAUD_SUPPORTED, MAX_BAUD_SUPPORTED);
+ DPRINT_CONFIG(("%s: returned baud %d for line %d\n", __func__, baud,
+ the_port->line));
+
+ if (!the_port->fifosize)
+ the_port->fifosize = FIFO_SIZE;
+ uart_update_timeout(the_port, cflag, baud);
+
+ the_port->ignore_status_mask = N_ALL_INPUT;
+
+ state->port.low_latency = 1;
+
+ if (iflag & IGNPAR)
+ the_port->ignore_status_mask &= ~(N_PARITY_ERROR
+ | N_FRAMING_ERROR);
+ if (iflag & IGNBRK) {
+ the_port->ignore_status_mask &= ~N_BREAK;
+ if (iflag & IGNPAR)
+ the_port->ignore_status_mask &= ~N_OVERRUN_ERROR;
+ }
+ if (!(cflag & CREAD)) {
+ /* ignore everything */
+ the_port->ignore_status_mask &= ~N_DATA_READY;
+ }
+
+ if (cflag & CRTSCTS) {
+ /* enable hardware flow control */
+ port->ip_sscr |= SSCR_HFC_EN;
+ }
+ else {
+ /* disable hardware flow control */
+ port->ip_sscr &= ~SSCR_HFC_EN;
+ }
+ writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+
+ /* Set the configuration and proper notification call */
+ DPRINT_CONFIG(("%s : port 0x%p line %d cflag 0%o "
+ "config_port(baud %d data %d stop %d penable %d "
+ " parity %d), notification 0x%x\n",
+ __func__, (void *)port, the_port->line, cflag, baud,
+ new_data, new_stop, new_parity_enable, new_parity,
+ the_port->ignore_status_mask));
+
+ if ((config_port(port, baud, /* baud */
+ new_data, /* byte size */
+ new_stop, /* stop bits */
+ new_parity_enable, /* set parity */
+ new_parity)) >= 0) { /* parity 1==odd */
+ set_notification(port, the_port->ignore_status_mask, 1);
+ }
+}
+
+/**
+ * ic3_startup_local - Start up the serial port - returns >= 0 if no errors
+ * @the_port: Port to operate on
+ */
+static inline int ic3_startup_local(struct uart_port *the_port)
+{
+ struct ioc3_port *port;
+
+ if (!the_port) {
+ NOT_PROGRESS();
+ return -1;
+ }
+
+ port = get_ioc3_port(the_port);
+ if (!port) {
+ NOT_PROGRESS();
+ return -1;
+ }
+
+ local_open(port);
+
+ /* set the protocol */
+ ioc3_set_proto(port, IS_RS232(the_port->line) ? PROTO_RS232 :
+ PROTO_RS422);
+ return 0;
+}
+
+/*
+ * ioc3_cb_output_lowat - called when the output low water mark is hit
+ * @port: port to output
+ */
+static void ioc3_cb_output_lowat(struct ioc3_port *port)
+{
+ unsigned long pflags;
+
+ /* the_port->lock is set on the call here */
+ if (port->ip_port) {
+ spin_lock_irqsave(&port->ip_port->lock, pflags);
+ transmit_chars(port->ip_port);
+ spin_unlock_irqrestore(&port->ip_port->lock, pflags);
+ }
+}
+
+/*
+ * ioc3_cb_post_ncs - called for some basic errors
+ * @port: port to use
+ * @ncs: event
+ */
+static void ioc3_cb_post_ncs(struct uart_port *the_port, int ncs)
+{
+ struct uart_icount *icount;
+
+ icount = &the_port->icount;
+
+ if (ncs & NCS_BREAK)
+ icount->brk++;
+ if (ncs & NCS_FRAMING)
+ icount->frame++;
+ if (ncs & NCS_OVERRUN)
+ icount->overrun++;
+ if (ncs & NCS_PARITY)
+ icount->parity++;
+}
+
+/**
+ * do_read - Read in bytes from the port. Return the number of bytes
+ * actually read.
+ * @the_port: port to use
+ * @buf: place to put the stuff we read
+ * @len: how big 'buf' is
+ */
+
+static inline int do_read(struct uart_port *the_port, char *buf, int len)
+{
+ int prod_ptr, cons_ptr, total;
+ struct ioc3_port *port = get_ioc3_port(the_port);
+ struct ring *inring;
+ struct ring_entry *entry;
+ struct port_hooks *hooks;
+ int byte_num;
+ char *sc;
+ int loop_counter;
+
+ BUG_ON(!(len >= 0));
+ BUG_ON(!port);
+ hooks = port->ip_hooks;
+
+ /* There is a nasty timing issue in the IOC3. When the rx_timer
+ * expires or the rx_high condition arises, we take an interrupt.
+ * At some point while servicing the interrupt, we read bytes from
+ * the ring buffer and re-arm the rx_timer. However the rx_timer is
+ * not started until the first byte is received *after* it is armed,
+ * and any bytes pending in the rx construction buffers are not drained
+ * to memory until either there are 4 bytes available or the rx_timer
+ * expires. This leads to a potential situation where data is left
+ * in the construction buffers forever - 1 to 3 bytes were received
+ * after the interrupt was generated but before the rx_timer was
+ * re-armed. At that point as long as no subsequent bytes are received
+ * the timer will never be started and the bytes will remain in the
+ * construction buffer forever. The solution is to execute a DRAIN
+ * command after rearming the timer. This way any bytes received before
+ * the DRAIN will be drained to memory, and any bytes received after
+ * the DRAIN will start the TIMER and be drained when it expires.
+ * Luckily, this only needs to be done when the DMA buffer is empty
+ * since there is no requirement that this function return all
+ * available data as long as it returns some.
+ */
+ /* Re-arm the timer */
+
+ writel(port->ip_rx_cons | SRCIR_ARM, &port->ip_serial_regs->srcir);
+
+ prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
+ cons_ptr = port->ip_rx_cons;
+
+ if (prod_ptr == cons_ptr) {
+ int reset_dma = 0;
+
+ /* Input buffer appears empty, do a flush. */
+
+ /* DMA must be enabled for this to work. */
+ if (!(port->ip_sscr & SSCR_DMA_EN)) {
+ port->ip_sscr |= SSCR_DMA_EN;
+ reset_dma = 1;
+ }
+
+ /* Potential race condition: we must reload the srpir after
+ * issuing the drain command, otherwise we could think the rx
+ * buffer is empty, then take a very long interrupt, and when
+ * we come back it's full and we wait forever for the drain to
+ * complete.
+ */
+ writel(port->ip_sscr | SSCR_RX_DRAIN,
+ &port->ip_serial_regs->sscr);
+ prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
+
+ /* We must not wait for the DRAIN to complete unless there are
+ * at least 8 bytes (2 ring entries) available to receive the
+ * data otherwise the DRAIN will never complete and we'll
+ * deadlock here.
+ * In fact, to make things easier, I'll just ignore the flush if
+ * there is any data at all now available.
+ */
+ if (prod_ptr == cons_ptr) {
+ loop_counter = 0;
+ while (readl(&port->ip_serial_regs->sscr) &
+ SSCR_RX_DRAIN) {
+ loop_counter++;
+ if (loop_counter > MAXITER)
+ return -1;
+ }
+
+ /* SIGH. We have to reload the prod_ptr *again* since
+ * the drain may have caused it to change
+ */
+ prod_ptr = readl(&port->ip_serial_regs->srpir)
+ & PROD_CONS_MASK;
+ }
+ if (reset_dma) {
+ port->ip_sscr &= ~SSCR_DMA_EN;
+ writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+ }
+ }
+ inring = port->ip_inring;
+ port->ip_flags &= ~READ_ABORTED;
+
+ total = 0;
+ loop_counter = 0xfffff; /* to avoid hangs */
+
+ /* Grab bytes from the hardware */
+ while ((prod_ptr != cons_ptr) && (len > 0)) {
+ entry = (struct ring_entry *)((caddr_t) inring + cons_ptr);
+
+ if (loop_counter-- <= 0) {
+ printk(KERN_WARNING "IOC3 serial: "
+ "possible hang condition/"
+ "port stuck on read (line %d).\n",
+ the_port->line);
+ break;
+ }
+
+ /* According to the producer pointer, this ring entry
+ * must contain some data. But if the PIO happened faster
+ * than the DMA, the data may not be available yet, so let's
+ * wait until it arrives.
+ */
+ if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
+ /* Indicate the read is aborted so we don't disable
+ * the interrupt thinking that the consumer is
+ * congested.
+ */
+ port->ip_flags |= READ_ABORTED;
+ len = 0;
+ break;
+ }
+
+ /* Load the bytes/status out of the ring entry */
+ for (byte_num = 0; byte_num < 4 && len > 0; byte_num++) {
+ sc = &(entry->ring_sc[byte_num]);
+
+ /* Check for change in modem state or overrun */
+ if ((*sc & RXSB_MODEM_VALID)
+ && (port->ip_notify & N_DDCD)) {
+ /* Notify upper layer if DCD dropped */
+ if ((port->ip_flags & DCD_ON)
+ && !(*sc & RXSB_DCD)) {
+ /* If we have already copied some data,
+ * return it. We'll pick up the carrier
+ * drop on the next pass. That way we
+ * don't throw away the data that has
+ * already been copied back to
+ * the caller's buffer.
+ */
+ if (total > 0) {
+ len = 0;
+ break;
+ }
+ port->ip_flags &= ~DCD_ON;
+
+ /* Turn off this notification so the
+ * carrier drop protocol won't see it
+ * again when it does a read.
+ */
+ *sc &= ~RXSB_MODEM_VALID;
+
+ /* To keep things consistent, we need
+ * to update the consumer pointer so
+ * the next reader won't come in and
+ * try to read the same ring entries
+ * again. This must be done here before
+ * the dcd change.
+ */
+
+ if ((entry->ring_allsc & RING_ANY_VALID)
+ == 0) {
+ cons_ptr += (int)sizeof
+ (struct ring_entry);
+ cons_ptr &= PROD_CONS_MASK;
+ }
+ writel(cons_ptr,
+ &port->ip_serial_regs->srcir);
+ port->ip_rx_cons = cons_ptr;
+
+ /* Notify upper layer of carrier drop */
+ if ((port->ip_notify & N_DDCD)
+ && port->ip_port) {
+ uart_handle_dcd_change
+ (port->ip_port, 0);
+ wake_up_interruptible
+ (&the_port->state->
+ port.delta_msr_wait);
+ }
+
+ /* If we had any data to return, we
+ * would have returned it above.
+ */
+ return 0;
+ }
+ }
+ if (*sc & RXSB_MODEM_VALID) {
+ /* Notify that an input overrun occurred */
+ if ((*sc & RXSB_OVERRUN)
+ && (port->ip_notify & N_OVERRUN_ERROR)) {
+ ioc3_cb_post_ncs(the_port, NCS_OVERRUN);
+ }
+ /* Don't look at this byte again */
+ *sc &= ~RXSB_MODEM_VALID;
+ }
+
+ /* Check for valid data or RX errors */
+ if ((*sc & RXSB_DATA_VALID) &&
+ ((*sc & (RXSB_PAR_ERR
+ | RXSB_FRAME_ERR | RXSB_BREAK))
+ && (port->ip_notify & (N_PARITY_ERROR
+ | N_FRAMING_ERROR
+ | N_BREAK)))) {
+ /* There is an error condition on the next byte.
+ * If we have already transferred some bytes,
+ * we'll stop here. Otherwise if this is the
+ * first byte to be read, we'll just transfer
+ * it alone after notifying the
+ * upper layer of its status.
+ */
+ if (total > 0) {
+ len = 0;
+ break;
+ } else {
+ if ((*sc & RXSB_PAR_ERR) &&
+ (port->
+ ip_notify & N_PARITY_ERROR)) {
+ ioc3_cb_post_ncs(the_port,
+ NCS_PARITY);
+ }
+ if ((*sc & RXSB_FRAME_ERR) &&
+ (port->
+ ip_notify & N_FRAMING_ERROR)) {
+ ioc3_cb_post_ncs(the_port,
+ NCS_FRAMING);
+ }
+ if ((*sc & RXSB_BREAK)
+ && (port->ip_notify & N_BREAK)) {
+ ioc3_cb_post_ncs
+ (the_port, NCS_BREAK);
+ }
+ len = 1;
+ }
+ }
+ if (*sc & RXSB_DATA_VALID) {
+ *sc &= ~RXSB_DATA_VALID;
+ *buf = entry->ring_data[byte_num];
+ buf++;
+ len--;
+ total++;
+ }
+ }
+
+ /* If we used up this entry entirely, go on to the next one,
+ * otherwise we must have run out of buffer space, so
+ * leave the consumer pointer here for the next read in case
+ * there are still unread bytes in this entry.
+ */
+ if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
+ cons_ptr += (int)sizeof(struct ring_entry);
+ cons_ptr &= PROD_CONS_MASK;
+ }
+ }
+
+ /* Update consumer pointer and re-arm rx timer interrupt */
+ writel(cons_ptr, &port->ip_serial_regs->srcir);
+ port->ip_rx_cons = cons_ptr;
+
+ /* If we have now dipped below the rx high water mark and we have
+ * rx_high interrupt turned off, we can now turn it back on again.
+ */
+ if ((port->ip_flags & INPUT_HIGH) && (((prod_ptr - cons_ptr)
+ & PROD_CONS_MASK) <
+ ((port->
+ ip_sscr &
+ SSCR_RX_THRESHOLD)
+ << PROD_CONS_PTR_OFF))) {
+ port->ip_flags &= ~INPUT_HIGH;
+ enable_intrs(port, hooks->intr_rx_high);
+ }
+ return total;
+}
+
+/**
+ * receive_chars - upper level read.
+ * @the_port: port to read from
+ */
+static int receive_chars(struct uart_port *the_port)
+{
+ unsigned char ch[MAX_CHARS];
+ int read_count = 0, read_room, flip = 0;
+ struct uart_state *state = the_port->state;
+ struct ioc3_port *port = get_ioc3_port(the_port);
+ unsigned long pflags;
+
+ /* Make sure all the pointers are "good" ones */
+ if (!state)
+ return 0;
+
+ if (!(port->ip_flags & INPUT_ENABLE))
+ return 0;
+
+ spin_lock_irqsave(&the_port->lock, pflags);
+
+ read_count = do_read(the_port, ch, MAX_CHARS);
+ if (read_count > 0) {
+ flip = 1;
+ read_room = tty_insert_flip_string(&state->port, ch,
+ read_count);
+ the_port->icount.rx += read_count;
+ }
+ spin_unlock_irqrestore(&the_port->lock, pflags);
+
+ if (flip)
+ tty_flip_buffer_push(&state->port);
+
+ return read_count;
+}
+
+/**
+ * ioc3uart_intr_one - lowest level (per port) interrupt handler.
+ * @is : submodule
+ * @idd: driver data
+ * @pending: interrupts to handle
+ */
+
+static int inline
+ioc3uart_intr_one(struct ioc3_submodule *is,
+ struct ioc3_driver_data *idd,
+ unsigned int pending)
+{
+ int port_num = GET_PORT_FROM_SIO_IR(pending);
+ struct port_hooks *hooks;
+ unsigned int rx_high_rd_aborted = 0;
+ unsigned long flags;
+ struct uart_port *the_port;
+ struct ioc3_port *port;
+ int loop_counter;
+ struct ioc3_card *card_ptr;
+ unsigned int sio_ir;
+
+ card_ptr = idd->data[is->id];
+ port = card_ptr->ic_port[port_num].icp_port;
+ hooks = port->ip_hooks;
+
+ /* Possible race condition here: The tx_mt interrupt bit may be
+ * cleared without the intervention of the interrupt handler,
+ * e.g. by a write. If the top level interrupt handler reads a
+ * tx_mt, then some other processor does a write, starting up
+ * output, then we come in here, see the tx_mt and stop DMA, the
+ * output started by the other processor will hang. Thus we can
+ * only rely on tx_mt being legitimate if it is read while the
+ * port lock is held. Therefore this bit must be ignored in the
+ * passed in interrupt mask which was read by the top level
+ * interrupt handler since the port lock was not held at the time
+ * it was read. We can only rely on this bit being accurate if it
+ * is read while the port lock is held. So we'll clear it for now,
+ * and reload it later once we have the port lock.
+ */
+
+ sio_ir = pending & ~(hooks->intr_tx_mt);
+ spin_lock_irqsave(&port->ip_lock, flags);
+
+ loop_counter = MAXITER; /* to avoid hangs */
+
+ do {
+ uint32_t shadow;
+
+ if (loop_counter-- <= 0) {
+ printk(KERN_WARNING "IOC3 serial: "
+ "possible hang condition/"
+ "port stuck on interrupt (line %d).\n",
+ ((struct uart_port *)port->ip_port)->line);
+ break;
+ }
+ /* Handle a DCD change */
+ if (sio_ir & hooks->intr_delta_dcd) {
+ ioc3_ack(is, idd, hooks->intr_delta_dcd);
+ shadow = readl(&port->ip_serial_regs->shadow);
+
+ if ((port->ip_notify & N_DDCD)
+ && (shadow & SHADOW_DCD)
+ && (port->ip_port)) {
+ the_port = port->ip_port;
+ uart_handle_dcd_change(the_port,
+ shadow & SHADOW_DCD);
+ wake_up_interruptible
+ (&the_port->state->port.delta_msr_wait);
+ } else if ((port->ip_notify & N_DDCD)
+ && !(shadow & SHADOW_DCD)) {
+ /* Flag delta DCD/no DCD */
+ uart_handle_dcd_change(port->ip_port,
+ shadow & SHADOW_DCD);
+ port->ip_flags |= DCD_ON;
+ }
+ }
+
+ /* Handle a CTS change */
+ if (sio_ir & hooks->intr_delta_cts) {
+ ioc3_ack(is, idd, hooks->intr_delta_cts);
+ shadow = readl(&port->ip_serial_regs->shadow);
+
+ if ((port->ip_notify & N_DCTS) && (port->ip_port)) {
+ the_port = port->ip_port;
+ uart_handle_cts_change(the_port, shadow
+ & SHADOW_CTS);
+ wake_up_interruptible
+ (&the_port->state->port.delta_msr_wait);
+ }
+ }
+
+ /* rx timeout interrupt. Must be some data available. Put this
+ * before the check for rx_high since servicing this condition
+ * may cause that condition to clear.
+ */
+ if (sio_ir & hooks->intr_rx_timer) {
+ ioc3_ack(is, idd, hooks->intr_rx_timer);
+ if ((port->ip_notify & N_DATA_READY)
+ && (port->ip_port)) {
+ receive_chars(port->ip_port);
+ }
+ }
+
+ /* rx high interrupt. Must be after rx_timer. */
+ else if (sio_ir & hooks->intr_rx_high) {
+ /* Data available, notify upper layer */
+ if ((port->ip_notify & N_DATA_READY) && port->ip_port) {
+ receive_chars(port->ip_port);
+ }
+
+ /* We can't ACK this interrupt. If receive_chars didn't
+ * cause the condition to clear, we'll have to disable
+ * the interrupt until the data is drained.
+ * If the read was aborted, don't disable the interrupt
+ * as this may cause us to hang indefinitely. An
+ * aborted read generally means that this interrupt
+ * hasn't been delivered to the cpu yet anyway, even
+ * though we see it as asserted when we read the sio_ir.
+ */
+ if ((sio_ir = PENDING(card_ptr, idd))
+ & hooks->intr_rx_high) {
+ if (port->ip_flags & READ_ABORTED) {
+ rx_high_rd_aborted++;
+ }
+ else {
+ card_ptr->ic_enable &= ~hooks->intr_rx_high;
+ port->ip_flags |= INPUT_HIGH;
+ }
+ }
+ }
+
+ /* We got a low water interrupt: notify upper layer to
+ * send more data. Must come before tx_mt since servicing
+ * this condition may cause that condition to clear.
+ */
+ if (sio_ir & hooks->intr_tx_explicit) {
+ port->ip_flags &= ~LOWAT_WRITTEN;
+ ioc3_ack(is, idd, hooks->intr_tx_explicit);
+ if (port->ip_notify & N_OUTPUT_LOWAT)
+ ioc3_cb_output_lowat(port);
+ }
+
+ /* Handle tx_mt. Must come after tx_explicit. */
+ else if (sio_ir & hooks->intr_tx_mt) {
+ /* If we are expecting a lowat notification
+ * and we get to this point it probably means that for
+ * some reason the tx_explicit didn't work as expected
+ * (that can legitimately happen if the output buffer is
+ * filled up in just the right way).
+ * So send the notification now.
+ */
+ if (port->ip_notify & N_OUTPUT_LOWAT) {
+ ioc3_cb_output_lowat(port);
+
+ /* We need to reload the sio_ir since the lowat
+ * call may have caused another write to occur,
+ * clearing the tx_mt condition.
+ */
+ sio_ir = PENDING(card_ptr, idd);
+ }
+
+ /* If the tx_mt condition still persists even after the
+ * lowat call, we've got some work to do.
+ */
+ if (sio_ir & hooks->intr_tx_mt) {
+ /* If we are not currently expecting DMA input,
+ * and the transmitter has just gone idle,
+ * there is no longer any reason for DMA, so
+ * disable it.
+ */
+ if (!(port->ip_notify
+ & (N_DATA_READY | N_DDCD))) {
+ BUG_ON(!(port->ip_sscr
+ & SSCR_DMA_EN));
+ port->ip_sscr &= ~SSCR_DMA_EN;
+ writel(port->ip_sscr,
+ &port->ip_serial_regs->sscr);
+ }
+ /* Prevent infinite tx_mt interrupt */
+ card_ptr->ic_enable &= ~hooks->intr_tx_mt;
+ }
+ }
+ sio_ir = PENDING(card_ptr, idd);
+
+ /* if the read was aborted and only hooks->intr_rx_high,
+ * clear hooks->intr_rx_high, so we do not loop forever.
+ */
+
+ if (rx_high_rd_aborted && (sio_ir == hooks->intr_rx_high)) {
+ sio_ir &= ~hooks->intr_rx_high;
+ }
+ } while (sio_ir & hooks->intr_all);
+
+ spin_unlock_irqrestore(&port->ip_lock, flags);
+ ioc3_enable(is, idd, card_ptr->ic_enable);
+ return 0;
+}
+
+/**
+ * ioc3uart_intr - field all serial interrupts
+ * @is : submodule
+ * @idd: driver data
+ * @pending: interrupts to handle
+ *
+ */
+
+static int ioc3uart_intr(struct ioc3_submodule *is,
+ struct ioc3_driver_data *idd,
+ unsigned int pending)
+{
+ int ret = 0;
+
+ /*
+ * The upper level interrupt handler sends interrupts for both ports
+ * here. So we need to call for each port with its interrupts.
+ */
+
+ if (pending & SIO_IR_SA)
+ ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SA);
+ if (pending & SIO_IR_SB)
+ ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SB);
+
+ return ret;
+}
+
+/**
+ * ic3_type
+ * @port: Port to operate with (we ignore since we only have one port)
+ *
+ */
+static const char *ic3_type(struct uart_port *the_port)
+{
+ if (IS_RS232(the_port->line))
+ return "SGI IOC3 Serial [rs232]";
+ else
+ return "SGI IOC3 Serial [rs422]";
+}
+
+/**
+ * ic3_tx_empty - Is the transmitter empty?
+ * @port: Port to operate on
+ *
+ */
+static unsigned int ic3_tx_empty(struct uart_port *the_port)
+{
+ unsigned int ret = 0;
+ struct ioc3_port *port = get_ioc3_port(the_port);
+
+ if (readl(&port->ip_serial_regs->shadow) & SHADOW_TEMT)
+ ret = TIOCSER_TEMT;
+ return ret;
+}
+
+/**
+ * ic3_stop_tx - stop the transmitter
+ * @port: Port to operate on
+ *
+ */
+static void ic3_stop_tx(struct uart_port *the_port)
+{
+ struct ioc3_port *port = get_ioc3_port(the_port);
+
+ if (port)
+ set_notification(port, N_OUTPUT_LOWAT, 0);
+}
+
+/**
+ * ic3_stop_rx - stop the receiver
+ * @port: Port to operate on
+ *
+ */
+static void ic3_stop_rx(struct uart_port *the_port)
+{
+ struct ioc3_port *port = get_ioc3_port(the_port);
+
+ if (port)
+ port->ip_flags &= ~INPUT_ENABLE;
+}
+
+/**
+ * null_void_function
+ * @port: Port to operate on
+ *
+ */
+static void null_void_function(struct uart_port *the_port)
+{
+}
+
+/**
+ * ic3_shutdown - shut down the port - free irq and disable
+ * @port: port to shut down
+ *
+ */
+static void ic3_shutdown(struct uart_port *the_port)
+{
+ unsigned long port_flags;
+ struct ioc3_port *port;
+ struct uart_state *state;
+
+ port = get_ioc3_port(the_port);
+ if (!port)
+ return;
+
+ state = the_port->state;
+ wake_up_interruptible(&state->port.delta_msr_wait);
+
+ spin_lock_irqsave(&the_port->lock, port_flags);
+ set_notification(port, N_ALL, 0);
+ spin_unlock_irqrestore(&the_port->lock, port_flags);
+}
+
+/**
+ * ic3_set_mctrl - set control lines (dtr, rts, etc)
+ * @port: Port to operate on
+ * @mctrl: Lines to set/unset
+ *
+ */
+static void ic3_set_mctrl(struct uart_port *the_port, unsigned int mctrl)
+{
+ unsigned char mcr = 0;
+
+ if (mctrl & TIOCM_RTS)
+ mcr |= UART_MCR_RTS;
+ if (mctrl & TIOCM_DTR)
+ mcr |= UART_MCR_DTR;
+ if (mctrl & TIOCM_OUT1)
+ mcr |= UART_MCR_OUT1;
+ if (mctrl & TIOCM_OUT2)
+ mcr |= UART_MCR_OUT2;
+ if (mctrl & TIOCM_LOOP)
+ mcr |= UART_MCR_LOOP;
+
+ set_mcr(the_port, mcr, SHADOW_DTR);
+}
+
+/**
+ * ic3_get_mctrl - get control line info
+ * @port: port to operate on
+ *
+ */
+static unsigned int ic3_get_mctrl(struct uart_port *the_port)
+{
+ struct ioc3_port *port = get_ioc3_port(the_port);
+ uint32_t shadow;
+ unsigned int ret = 0;
+
+ if (!port)
+ return 0;
+
+ shadow = readl(&port->ip_serial_regs->shadow);
+ if (shadow & SHADOW_DCD)
+ ret |= TIOCM_CD;
+ if (shadow & SHADOW_DR)
+ ret |= TIOCM_DSR;
+ if (shadow & SHADOW_CTS)
+ ret |= TIOCM_CTS;
+ return ret;
+}
+
+/**
+ * ic3_start_tx - Start transmitter. Called with the_port->lock
+ * @port: Port to operate on
+ *
+ */
+static void ic3_start_tx(struct uart_port *the_port)
+{
+ struct ioc3_port *port = get_ioc3_port(the_port);
+
+ if (port) {
+ set_notification(port, N_OUTPUT_LOWAT, 1);
+ enable_intrs(port, port->ip_hooks->intr_tx_mt);
+ }
+}
+
+/**
+ * ic3_break_ctl - handle breaks
+ * @port: Port to operate on
+ * @break_state: Break state
+ *
+ */
+static void ic3_break_ctl(struct uart_port *the_port, int break_state)
+{
+}
+
+/**
+ * ic3_startup - Start up the serial port - always return 0 (We're always on)
+ * @port: Port to operate on
+ *
+ */
+static int ic3_startup(struct uart_port *the_port)
+{
+ int retval;
+ struct ioc3_port *port;
+ struct ioc3_card *card_ptr;
+ unsigned long port_flags;
+
+ if (!the_port) {
+ NOT_PROGRESS();
+ return -ENODEV;
+ }
+ port = get_ioc3_port(the_port);
+ if (!port) {
+ NOT_PROGRESS();
+ return -ENODEV;
+ }
+ card_ptr = port->ip_card;
+ port->ip_port = the_port;
+
+ if (!card_ptr) {
+ NOT_PROGRESS();
+ return -ENODEV;
+ }
+
+ /* Start up the serial port */
+ spin_lock_irqsave(&the_port->lock, port_flags);
+ retval = ic3_startup_local(the_port);
+ spin_unlock_irqrestore(&the_port->lock, port_flags);
+ return retval;
+}
+
+/**
+ * ic3_set_termios - set termios stuff
+ * @port: port to operate on
+ * @termios: New settings
+ * @termios: Old
+ *
+ */
+static void
+ic3_set_termios(struct uart_port *the_port,
+ struct ktermios *termios, struct ktermios *old_termios)
+{
+ unsigned long port_flags;
+
+ spin_lock_irqsave(&the_port->lock, port_flags);
+ ioc3_change_speed(the_port, termios, old_termios);
+ spin_unlock_irqrestore(&the_port->lock, port_flags);
+}
+
+/**
+ * ic3_request_port - allocate resources for port - no op....
+ * @port: port to operate on
+ *
+ */
+static int ic3_request_port(struct uart_port *port)
+{
+ return 0;
+}
+
+/* Associate the uart functions above - given to serial core */
+static struct uart_ops ioc3_ops = {
+ .tx_empty = ic3_tx_empty,
+ .set_mctrl = ic3_set_mctrl,
+ .get_mctrl = ic3_get_mctrl,
+ .stop_tx = ic3_stop_tx,
+ .start_tx = ic3_start_tx,
+ .stop_rx = ic3_stop_rx,
+ .break_ctl = ic3_break_ctl,
+ .startup = ic3_startup,
+ .shutdown = ic3_shutdown,
+ .set_termios = ic3_set_termios,
+ .type = ic3_type,
+ .release_port = null_void_function,
+ .request_port = ic3_request_port,
+};
+
+/*
+ * Boot-time initialization code
+ */
+
+static struct uart_driver ioc3_uart = {
+ .owner = THIS_MODULE,
+ .driver_name = "ioc3_serial",
+ .dev_name = DEVICE_NAME,
+ .major = DEVICE_MAJOR,
+ .minor = DEVICE_MINOR,
+ .nr = MAX_LOGICAL_PORTS
+};
+
+/**
+ * ioc3_serial_core_attach - register with serial core
+ * This is done during pci probing
+ * @is: submodule struct for this
+ * @idd: handle for this card
+ */
+static inline int ioc3_serial_core_attach( struct ioc3_submodule *is,
+ struct ioc3_driver_data *idd)
+{
+ struct ioc3_port *port;
+ struct uart_port *the_port;
+ struct ioc3_card *card_ptr = idd->data[is->id];
+ int ii, phys_port;
+ struct pci_dev *pdev = idd->pdev;
+
+ DPRINT_CONFIG(("%s: attach pdev 0x%p - card_ptr 0x%p\n",
+ __func__, pdev, (void *)card_ptr));
+
+ if (!card_ptr)
+ return -ENODEV;
+
+ /* once around for each logical port on this card */
+ for (ii = 0; ii < LOGICAL_PORTS_PER_CARD; ii++) {
+ phys_port = GET_PHYSICAL_PORT(ii);
+ the_port = &card_ptr->ic_port[phys_port].
+ icp_uart_port[GET_LOGICAL_PORT(ii)];
+ port = card_ptr->ic_port[phys_port].icp_port;
+ port->ip_port = the_port;
+
+ DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p [%d/%d]\n",
+ __func__, (void *)the_port, (void *)port,
+ phys_port, ii));
+
+ /* membase, iobase and mapbase just need to be non-0 */
+ the_port->membase = (unsigned char __iomem *)1;
+ the_port->iobase = (pdev->bus->number << 16) | ii;
+ the_port->line = (Num_of_ioc3_cards << 2) | ii;
+ the_port->mapbase = 1;
+ the_port->type = PORT_16550A;
+ the_port->fifosize = FIFO_SIZE;
+ the_port->ops = &ioc3_ops;
+ the_port->irq = idd->irq_io;
+ the_port->dev = &pdev->dev;
+
+ if (uart_add_one_port(&ioc3_uart, the_port) < 0) {
+ printk(KERN_WARNING
+ "%s: unable to add port %d bus %d\n",
+ __func__, the_port->line, pdev->bus->number);
+ } else {
+ DPRINT_CONFIG(("IOC3 serial port %d irq %d bus %d\n",
+ the_port->line, the_port->irq, pdev->bus->number));
+ }
+
+ /* all ports are rs232 for now */
+ if (IS_PHYSICAL_PORT(ii))
+ ioc3_set_proto(port, PROTO_RS232);
+ }
+ return 0;
+}
+
+/**
+ * ioc3uart_remove - register detach function
+ * @is: submodule struct for this submodule
+ * @idd: ioc3 driver data for this submodule
+ */
+
+static int ioc3uart_remove(struct ioc3_submodule *is,
+ struct ioc3_driver_data *idd)
+{
+ struct ioc3_card *card_ptr = idd->data[is->id];
+ struct uart_port *the_port;
+ struct ioc3_port *port;
+ int ii;
+
+ if (card_ptr) {
+ for (ii = 0; ii < LOGICAL_PORTS_PER_CARD; ii++) {
+ the_port = &card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].
+ icp_uart_port[GET_LOGICAL_PORT(ii)];
+ if (the_port)
+ uart_remove_one_port(&ioc3_uart, the_port);
+ port = card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].icp_port;
+ if (port && IS_PHYSICAL_PORT(ii)
+ && (GET_PHYSICAL_PORT(ii) == 0)) {
+ pci_free_consistent(port->ip_idd->pdev,
+ TOTAL_RING_BUF_SIZE,
+ (void *)port->ip_cpu_ringbuf,
+ port->ip_dma_ringbuf);
+ kfree(port);
+ card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].
+ icp_port = NULL;
+ }
+ }
+ kfree(card_ptr);
+ idd->data[is->id] = NULL;
+ }
+ return 0;
+}
+
+/**
+ * ioc3uart_probe - card probe function called from shim driver
+ * @is: submodule struct for this submodule
+ * @idd: ioc3 driver data for this card
+ */
+
+static int
+ioc3uart_probe(struct ioc3_submodule *is, struct ioc3_driver_data *idd)
+{
+ struct pci_dev *pdev = idd->pdev;
+ struct ioc3_card *card_ptr;
+ int ret = 0;
+ struct ioc3_port *port;
+ struct ioc3_port *ports[PORTS_PER_CARD];
+ int phys_port;
+ int cnt;
+
+ DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __func__, is, idd));
+
+ card_ptr = kzalloc(sizeof(struct ioc3_card), GFP_KERNEL);
+ if (!card_ptr) {
+ printk(KERN_WARNING "ioc3_attach_one"
+ ": unable to get memory for the IOC3\n");
+ return -ENOMEM;
+ }
+ idd->data[is->id] = card_ptr;
+ Submodule_slot = is->id;
+
+ writel(((UARTA_BASE >> 3) << SIO_CR_SER_A_BASE_SHIFT) |
+ ((UARTB_BASE >> 3) << SIO_CR_SER_B_BASE_SHIFT) |
+ (0xf << SIO_CR_CMD_PULSE_SHIFT), &idd->vma->sio_cr);
+
+ pci_write_config_dword(pdev, PCI_LAT, 0xff00);
+
+ /* Enable serial port mode select generic PIO pins as outputs */
+ ioc3_gpcr_set(idd, GPCR_UARTA_MODESEL | GPCR_UARTB_MODESEL);
+
+ /* Create port structures for each port */
+ for (phys_port = 0; phys_port < PORTS_PER_CARD; phys_port++) {
+ port = kzalloc(sizeof(struct ioc3_port), GFP_KERNEL);
+ if (!port) {
+ printk(KERN_WARNING
+ "IOC3 serial memory not available for port\n");
+ ret = -ENOMEM;
+ goto out4;
+ }
+ spin_lock_init(&port->ip_lock);
+
+ /* we need to remember the previous ones, to point back to
+ * them farther down - setting up the ring buffers.
+ */
+ ports[phys_port] = port;
+
+ /* init to something useful */
+ card_ptr->ic_port[phys_port].icp_port = port;
+ port->ip_is = is;
+ port->ip_idd = idd;
+ port->ip_baud = 9600;
+ port->ip_card = card_ptr;
+ port->ip_hooks = &hooks_array[phys_port];
+
+ /* Setup each port */
+ if (phys_port == 0) {
+ port->ip_serial_regs = &idd->vma->port_a;
+ port->ip_uart_regs = &idd->vma->sregs.uarta;
+
+ DPRINT_CONFIG(("%s : Port A ip_serial_regs 0x%p "
+ "ip_uart_regs 0x%p\n",
+ __func__,
+ (void *)port->ip_serial_regs,
+ (void *)port->ip_uart_regs));
+
+ /* setup ring buffers */
+ port->ip_cpu_ringbuf = pci_alloc_consistent(pdev,
+ TOTAL_RING_BUF_SIZE, &port->ip_dma_ringbuf);
+
+ BUG_ON(!((((int64_t) port->ip_dma_ringbuf) &
+ (TOTAL_RING_BUF_SIZE - 1)) == 0));
+ port->ip_inring = RING(port, RX_A);
+ port->ip_outring = RING(port, TX_A);
+ DPRINT_CONFIG(("%s : Port A ip_cpu_ringbuf 0x%p "
+ "ip_dma_ringbuf 0x%p, ip_inring 0x%p "
+ "ip_outring 0x%p\n",
+ __func__,
+ (void *)port->ip_cpu_ringbuf,
+ (void *)port->ip_dma_ringbuf,
+ (void *)port->ip_inring,
+ (void *)port->ip_outring));
+ }
+ else {
+ port->ip_serial_regs = &idd->vma->port_b;
+ port->ip_uart_regs = &idd->vma->sregs.uartb;
+
+ DPRINT_CONFIG(("%s : Port B ip_serial_regs 0x%p "
+ "ip_uart_regs 0x%p\n",
+ __func__,
+ (void *)port->ip_serial_regs,
+ (void *)port->ip_uart_regs));
+
+ /* share the ring buffers */
+ port->ip_dma_ringbuf =
+ ports[phys_port - 1]->ip_dma_ringbuf;
+ port->ip_cpu_ringbuf =
+ ports[phys_port - 1]->ip_cpu_ringbuf;
+ port->ip_inring = RING(port, RX_B);
+ port->ip_outring = RING(port, TX_B);
+ DPRINT_CONFIG(("%s : Port B ip_cpu_ringbuf 0x%p "
+ "ip_dma_ringbuf 0x%p, ip_inring 0x%p "
+ "ip_outring 0x%p\n",
+ __func__,
+ (void *)port->ip_cpu_ringbuf,
+ (void *)port->ip_dma_ringbuf,
+ (void *)port->ip_inring,
+ (void *)port->ip_outring));
+ }
+
+ DPRINT_CONFIG(("%s : port %d [addr 0x%p] card_ptr 0x%p",
+ __func__,
+ phys_port, (void *)port, (void *)card_ptr));
+ DPRINT_CONFIG((" ip_serial_regs 0x%p ip_uart_regs 0x%p\n",
+ (void *)port->ip_serial_regs,
+ (void *)port->ip_uart_regs));
+
+ /* Initialize the hardware for IOC3 */
+ port_init(port);
+
+ DPRINT_CONFIG(("%s: phys_port %d port 0x%p inring 0x%p "
+ "outring 0x%p\n",
+ __func__,
+ phys_port, (void *)port,
+ (void *)port->ip_inring,
+ (void *)port->ip_outring));
+
+ }
+
+ /* register port with the serial core */
+
+ if ((ret = ioc3_serial_core_attach(is, idd)))
+ goto out4;
+
+ Num_of_ioc3_cards++;
+
+ return ret;
+
+ /* error exits that give back resources */
+out4:
+ for (cnt = 0; cnt < phys_port; cnt++)
+ kfree(ports[cnt]);
+
+ kfree(card_ptr);
+ return ret;
+}
+
+static struct ioc3_submodule ioc3uart_ops = {
+ .name = "IOC3uart",
+ .probe = ioc3uart_probe,
+ .remove = ioc3uart_remove,
+ /* call .intr for both ports initially */
+ .irq_mask = SIO_IR_SA | SIO_IR_SB,
+ .intr = ioc3uart_intr,
+ .owner = THIS_MODULE,
+};
+
+/**
+ * ioc3_detect - module init called,
+ */
+static int __init ioc3uart_init(void)
+{
+ int ret;
+
+ /* register with serial core */
+ if ((ret = uart_register_driver(&ioc3_uart)) < 0) {
+ printk(KERN_WARNING
+ "%s: Couldn't register IOC3 uart serial driver\n",
+ __func__);
+ return ret;
+ }
+ ret = ioc3_register_submodule(&ioc3uart_ops);
+ if (ret)
+ uart_unregister_driver(&ioc3_uart);
+ return ret;
+}
+
+static void __exit ioc3uart_exit(void)
+{
+ ioc3_unregister_submodule(&ioc3uart_ops);
+ uart_unregister_driver(&ioc3_uart);
+}
+
+module_init(ioc3uart_init);
+module_exit(ioc3uart_exit);
+
+MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>");
+MODULE_DESCRIPTION("Serial PCI driver module for SGI IOC3 card");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff