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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | /* * Serial Port driver for Open Firmware platform devices * * Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>, IBM Corp. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include <linux/init.h> #include <linux/module.h> #include <linux/serial_core.h> #include <linux/serial_8250.h> #include <asm/of_platform.h> #include <asm/prom.h> struct of_serial_info { int type; int line; }; /* * Fill a struct uart_port for a given device node */ static int __devinit of_platform_serial_setup(struct of_device *ofdev, int type, struct uart_port *port) { struct resource resource; struct device_node *np = ofdev->node; const unsigned int *clk, *spd; int ret; memset(port, 0, sizeof *port); spd = of_get_property(np, "current-speed", NULL); clk = of_get_property(np, "clock-frequency", NULL); if (!clk) { dev_warn(&ofdev->dev, "no clock-frequency property set\n"); return -ENODEV; } ret = of_address_to_resource(np, 0, &resource); if (ret) { dev_warn(&ofdev->dev, "invalid address\n"); return ret; } spin_lock_init(&port->lock); port->mapbase = resource.start; port->irq = irq_of_parse_and_map(np, 0); port->iotype = UPIO_MEM; port->type = type; port->uartclk = *clk; port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_FIXED_PORT; port->dev = &ofdev->dev; port->custom_divisor = *clk / (16 * (*spd)); return 0; } /* * Try to register a serial port */ static int __devinit of_platform_serial_probe(struct of_device *ofdev, const struct of_device_id *id) { struct of_serial_info *info; struct uart_port port; int port_type; int ret; if (of_find_property(ofdev->node, "used-by-rtas", NULL)) return -EBUSY; info = kmalloc(sizeof(*info), GFP_KERNEL); if (info == NULL) return -ENOMEM; port_type = (unsigned long)id->data; ret = of_platform_serial_setup(ofdev, port_type, &port); if (ret) goto out; switch (port_type) { case PORT_8250 ... PORT_MAX_8250: ret = serial8250_register_port(&port); break; default: /* need to add code for these */ case PORT_UNKNOWN: dev_info(&ofdev->dev, "Unknown serial port found, ignored\n"); ret = -ENODEV; break; } if (ret < 0) goto out; info->type = port_type; info->line = ret; ofdev->dev.driver_data = info; return 0; out: kfree(info); irq_dispose_mapping(port.irq); return ret; } /* * Release a line */ static int of_platform_serial_remove(struct of_device *ofdev) { struct of_serial_info *info = ofdev->dev.driver_data; switch (info->type) { case PORT_8250 ... PORT_MAX_8250: serial8250_unregister_port(info->line); break; default: /* need to add code for these */ break; } kfree(info); return 0; } /* * A few common types, add more as needed. */ static struct of_device_id __devinitdata of_platform_serial_table[] = { { .type = "serial", .compatible = "ns8250", .data = (void *)PORT_8250, }, { .type = "serial", .compatible = "ns16450", .data = (void *)PORT_16450, }, { .type = "serial", .compatible = "ns16550", .data = (void *)PORT_16550, }, { .type = "serial", .compatible = "ns16750", .data = (void *)PORT_16750, }, { .type = "serial", .data = (void *)PORT_UNKNOWN, }, { /* end of list */ }, }; static struct of_platform_driver of_platform_serial_driver = { .owner = THIS_MODULE, .name = "of_serial", .probe = of_platform_serial_probe, .remove = of_platform_serial_remove, .match_table = of_platform_serial_table, }; static int __init of_platform_serial_init(void) { return of_register_platform_driver(&of_platform_serial_driver); } module_init(of_platform_serial_init); static void __exit of_platform_serial_exit(void) { return of_unregister_platform_driver(&of_platform_serial_driver); }; module_exit(of_platform_serial_exit); MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Serial Port driver for Open Firmware platform devices"); |