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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); |