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1 | /* |
2 | * Console via Blackfin JTAG Communication |
3 | * |
4 | * Copyright 2008-2011 Analog Devices Inc. |
5 | * |
6 | * Enter bugs at http://blackfin.uclinux.org/ |
7 | * |
8 | * Licensed under the GPL-2 or later. |
9 | */ |
10 | |
11 | #include <linux/console.h> |
12 | #include <linux/delay.h> |
13 | #include <linux/err.h> |
14 | #include <linux/init.h> |
15 | #include <linux/moduleparam.h> |
16 | #include <linux/types.h> |
17 | |
18 | #include "hvc_console.h" |
19 | |
20 | /* See the Debug/Emulation chapter in the HRM */ |
21 | #define EMUDOF 0x00000001 /* EMUDAT_OUT full & valid */ |
22 | #define EMUDIF 0x00000002 /* EMUDAT_IN full & valid */ |
23 | #define EMUDOOVF 0x00000004 /* EMUDAT_OUT overflow */ |
24 | #define EMUDIOVF 0x00000008 /* EMUDAT_IN overflow */ |
25 | |
26 | /* Helper functions to glue the register API to simple C operations */ |
27 | static inline uint32_t bfin_write_emudat(uint32_t emudat) |
28 | { |
29 | __asm__ __volatile__("emudat = %0;" : : "d"(emudat)); |
30 | return emudat; |
31 | } |
32 | |
33 | static inline uint32_t bfin_read_emudat(void) |
34 | { |
35 | uint32_t emudat; |
36 | __asm__ __volatile__("%0 = emudat;" : "=d"(emudat)); |
37 | return emudat; |
38 | } |
39 | |
40 | /* Send data to the host */ |
41 | static int hvc_bfin_put_chars(uint32_t vt, const char *buf, int count) |
42 | { |
43 | static uint32_t outbound_len; |
44 | uint32_t emudat; |
45 | int ret; |
46 | |
47 | if (bfin_read_DBGSTAT() & EMUDOF) |
48 | return 0; |
49 | |
50 | if (!outbound_len) { |
51 | outbound_len = count; |
52 | bfin_write_emudat(outbound_len); |
53 | return 0; |
54 | } |
55 | |
56 | ret = min(outbound_len, (uint32_t)4); |
57 | memcpy(&emudat, buf, ret); |
58 | bfin_write_emudat(emudat); |
59 | outbound_len -= ret; |
60 | |
61 | return ret; |
62 | } |
63 | |
64 | /* Receive data from the host */ |
65 | static int hvc_bfin_get_chars(uint32_t vt, char *buf, int count) |
66 | { |
67 | static uint32_t inbound_len; |
68 | uint32_t emudat; |
69 | int ret; |
70 | |
71 | if (!(bfin_read_DBGSTAT() & EMUDIF)) |
72 | return 0; |
73 | emudat = bfin_read_emudat(); |
74 | |
75 | if (!inbound_len) { |
76 | inbound_len = emudat; |
77 | return 0; |
78 | } |
79 | |
80 | ret = min(inbound_len, (uint32_t)4); |
81 | memcpy(buf, &emudat, ret); |
82 | inbound_len -= ret; |
83 | |
84 | return ret; |
85 | } |
86 | |
87 | /* Glue the HVC layers to the Blackfin layers */ |
88 | static const struct hv_ops hvc_bfin_get_put_ops = { |
89 | .get_chars = hvc_bfin_get_chars, |
90 | .put_chars = hvc_bfin_put_chars, |
91 | }; |
92 | |
93 | static int __init hvc_bfin_console_init(void) |
94 | { |
95 | hvc_instantiate(0, 0, &hvc_bfin_get_put_ops); |
96 | return 0; |
97 | } |
98 | console_initcall(hvc_bfin_console_init); |
99 | |
100 | static int __init hvc_bfin_init(void) |
101 | { |
102 | hvc_alloc(0, 0, &hvc_bfin_get_put_ops, 128); |
103 | return 0; |
104 | } |
105 | device_initcall(hvc_bfin_init); |
106 |
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