projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 6ec006ed CM |
1 | /* |
| 2 | * Copyright 2013 Tilera Corporation. All Rights Reserved. | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or | |
| 5 | * modify it under the terms of the GNU General Public License | |
| 6 | * as published by the Free Software Foundation, version 2. | |
| 7 | * | |
| 8 | * This program is distributed in the hope that it will be useful, but | |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
| 11 | * NON INFRINGEMENT. See the GNU General Public License for | |
| 12 | * more details. | |
| 13 | */ | |
| 14 | ||
| 15 | /* | |
| 16 | * Implementation of UART gxio calls. | |
| 17 | */ | |
| 18 | ||
| 19 | #include <linux/io.h> | |
| 20 | #include <linux/errno.h> | |
| 21 | #include <linux/module.h> | |
| 22 | ||
| 23 | #include <gxio/uart.h> | |
| 24 | #include <gxio/iorpc_globals.h> | |
| 25 | #include <gxio/iorpc_uart.h> | |
| 26 | #include <gxio/kiorpc.h> | |
| 27 | ||
| 28 | int gxio_uart_init(gxio_uart_context_t *context, int uart_index) | |
| 29 | { | |
| 30 | char file[32]; | |
| 31 | int fd; | |
| 32 | ||
| 33 | snprintf(file, sizeof(file), "uart/%d/iorpc", uart_index); | |
| 34 | fd = hv_dev_open((HV_VirtAddr) file, 0); | |
| 35 | if (fd < 0) { | |
| 36 | if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX) | |
| 37 | return fd; | |
| 38 | else | |
| 39 | return -ENODEV; | |
| 40 | } | |
| 41 | ||
| 42 | context->fd = fd; | |
| 43 | ||
| 44 | /* Map in the MMIO space. */ | |
| 45 | context->mmio_base = (void __force *) | |
| 46 | iorpc_ioremap(fd, HV_UART_MMIO_OFFSET, HV_UART_MMIO_SIZE); | |
| 47 | ||
| 48 | if (context->mmio_base == NULL) { | |
| 49 | hv_dev_close(context->fd); | |
| 50 | context->fd = -1; | |
| 51 | return -ENODEV; | |
| 52 | } | |
| 53 | ||
| 54 | return 0; | |
| 55 | } | |
| 56 | ||
| 57 | EXPORT_SYMBOL_GPL(gxio_uart_init); | |
| 58 | ||
| 59 | int gxio_uart_destroy(gxio_uart_context_t *context) | |
| 60 | { | |
| 61 | iounmap((void __force __iomem *)(context->mmio_base)); | |
| 62 | hv_dev_close(context->fd); | |
| 63 | ||
| 64 | context->mmio_base = NULL; | |
| 65 | context->fd = -1; | |
| 66 | ||
| 67 | return 0; | |
| 68 | } | |
| 69 | ||
| 70 | EXPORT_SYMBOL_GPL(gxio_uart_destroy); | |
| 71 | ||
| 72 | /* UART register write wrapper. */ | |
| 73 | void gxio_uart_write(gxio_uart_context_t *context, uint64_t offset, | |
| 74 | uint64_t word) | |
| 75 | { | |
| 76 | __gxio_mmio_write(context->mmio_base + offset, word); | |
| 77 | } | |
| 78 | ||
| 79 | EXPORT_SYMBOL_GPL(gxio_uart_write); | |
| 80 | ||
| 81 | /* UART register read wrapper. */ | |
| 82 | uint64_t gxio_uart_read(gxio_uart_context_t *context, uint64_t offset) | |
| 83 | { | |
| 84 | return __gxio_mmio_read(context->mmio_base + offset); | |
| 85 | } | |
| 86 | ||
| 87 | EXPORT_SYMBOL_GPL(gxio_uart_read); |