diff options
Diffstat (limited to 'bsps/i386/pc386/console/exar17d15x.c')
| -rw-r--r-- | bsps/i386/pc386/console/exar17d15x.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/bsps/i386/pc386/console/exar17d15x.c b/bsps/i386/pc386/console/exar17d15x.c new file mode 100644 index 0000000000..5cf615ac86 --- /dev/null +++ b/bsps/i386/pc386/console/exar17d15x.c @@ -0,0 +1,224 @@ +/** + * @file + * + * @brief Driver for Exar XR17D15x Multiport UARTs + * + * This driver supports 2, 4 or 8 port Exar parts which are NS16550 + * compatible. + */ + +/* + * COPYRIGHT (c) 1989-2012. + * On-Line Applications Research Corporation (OAR). + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <bsp.h> +#include <termios.h> +#include <stdio.h> +#include <stdlib.h> + +#include <rtems/termiostypes.h> +#include <libchip/serial.h> +#include <libchip/ns16550.h> +#include <rtems/bspIo.h> +#include <rtems/pci.h> +#include <bsp/exar17d15x.h> +#include "../../shared/dev/serial/legacy-console.h" + +#define MAX_BOARDS 4 + +/* + * This is the rate for the clock internal to the parts. + */ +#define EXAR_CLOCK_RATE (921600*16) + +/* + * Supported PCI Ids + */ +#define PCI_VENDOR_ID_EXAR 0x13A8 +#define PCI_VENDOR_ID_EXAR_XR17D158 0x0158 +#define PCI_VENDOR_ID_EXAR_XR17D154 0x0154 +#define PCI_VENDOR_ID_EXAR_XR17D152 0x0152 + +/* + * Structure to manage each instance found. + */ +typedef struct { + uint16_t vendor; + uint16_t device; + uint8_t ports; +} exar_parts_t; + +static exar_parts_t Supported[] = { + { PCI_VENDOR_ID_EXAR, PCI_VENDOR_ID_EXAR_XR17D158, 8 }, + { PCI_VENDOR_ID_EXAR, PCI_VENDOR_ID_EXAR_XR17D154, 4 }, + { PCI_VENDOR_ID_EXAR, PCI_VENDOR_ID_EXAR_XR17D152, 2 }, + { 0, 0, 0 } +}; + +/* + * Information saved from PCI scan + */ +typedef struct { + bool found; + uint32_t base; + uint8_t irq; + uint8_t bus; + uint8_t slot; + uint8_t ports; +} exar17d15x_conf_t; + +/* + * Register Access Routines + */ +static uint8_t xr17d15x_get_register(uint32_t addr, uint8_t i) +{ + uint8_t val = 0; + volatile uint8_t *reg = (volatile uint8_t *)(addr + i); + + val = *reg; + // printk( "RD %p -> 0x%02x\n", reg, val ); + return val; +} + +static void xr17d15x_set_register(uint32_t addr, uint8_t i, uint8_t val) +{ + volatile uint8_t *reg = (volatile uint8_t *)(addr + i); + + // printk( "WR %p <- 0x%02x\n", reg, val ); + *reg = val; +} + +rtems_device_driver exar17d15x_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor_arg, + void *arg +) +{ + // int pbus, pdev, pfun; + exar17d15x_conf_t conf[MAX_BOARDS]; + int boards = 0; + int b = 0; + int p; + console_tbl *ports; + console_tbl *port_p; + int pbus; + int pdev; + int pfun; + int status; + int instance; + int i; + int total_ports = 0; + + for ( b=0 ; b<MAX_BOARDS ; b++ ) { + conf[b].found = false; + } + + /* + * Scan for Serial port boards + * + * NOTE: There appear to be Exar parts with 2 and 4 ports which would + * be easy to support. Just change the hard-coded 8 ports per + * board to variable and adjust. + * + * NOTE: There are likely other board vendors which could be supported + * by this. + */ + for ( instance=0 ; instance < MAX_BOARDS ; instance++ ) { + + for ( i=0 ; Supported[i].ports != 0 ; i++ ) { + status = pci_find_device( + Supported[i].vendor, + Supported[i].device, + instance, + &pbus, + &pdev, + &pfun + ); + if ( status == PCIB_ERR_SUCCESS ) { + boards++; + conf[instance].found = true; + conf[instance].ports = Supported[i].ports; + total_ports += conf[instance].ports; + break; + } + } + + if ( status != PCIB_ERR_SUCCESS ) + continue; + + pci_read_config_byte( + pbus, + pdev, + pfun, + PCI_INTERRUPT_LINE, + &conf[instance].irq + ); + pci_read_config_dword( + pbus, + pdev, + pfun, + PCI_BASE_ADDRESS_0, + &conf[instance].base + ); + printk( + "Found Exar 17D15x %d at 0x%08lx IRQ %d with %d ports\n", + instance, + conf[instance].base, + conf[instance].irq, + conf[instance].ports + ); + } + + /* + * Now allocate array of device structures and fill them in + */ + ports = calloc( total_ports, sizeof( console_tbl ) ); + port_p = ports; + for ( b=0 ; b<MAX_BOARDS ; b++ ) { + if ( conf[b].found == false ) + continue; + for ( p=0 ; p<conf[b].ports ; p++ ) { + char name[32]; + + sprintf( name, "/dev/exar17d15x_%d_%d", b, p ); + //printk("Found %s\n", name ); + port_p->sDeviceName = strdup( name ); + port_p->deviceType = SERIAL_NS16550; + #if 1 + port_p->pDeviceFns = &ns16550_fns_polled; + #else + port_p->pDeviceFns = &ns16550_fns; + #endif + + port_p->deviceProbe = NULL; + port_p->pDeviceFlow = NULL; + port_p->ulMargin = 16; + port_p->ulHysteresis = 8; + port_p->pDeviceParams = (void *) 9600; + port_p->ulCtrlPort1 = conf[b].base + (p * 0x0200); + port_p->ulCtrlPort2 = 0; /* NA */ + port_p->ulDataPort = 0; /* NA */ + port_p->getRegister = xr17d15x_get_register; + port_p->setRegister = xr17d15x_set_register; + port_p->getData = NULL; /* NA */ + port_p->setData = NULL; /* NA */ + port_p->ulClock = EXAR_CLOCK_RATE; + port_p->ulIntVector = conf[b].irq; + + port_p++; + } /* end ports */ + } /* end boards */ + + /* + * Register the devices + */ + if ( boards ) + console_register_devices( ports, total_ports ); + + return RTEMS_SUCCESSFUL; +} |