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authorStephen Warren <swarren@nvidia.com>2012-09-25 17:54:56 -0400
committerStephen Warren <swarren@nvidia.com>2012-11-16 14:22:18 -0500
commit460678035247a9f72a4401dfeb6513ee495bf975 (patch)
tree4529e3199c7755ab7bf87e5003e389d0054d9a36 /arch/arm/include/debug
parent7a28106509463529d7b0408d3f5a0ab99f6810ee (diff)
ARM: tegra: move debug-macro.S to include/debug
Move Tegra's debug-macro.S over to the common debug macro directory. Move Tegra's debug UART selection menu into ARM's Kconfig.debug, so that all related options are selected in the same place. Tegra's uncompress.h is left in mach-tegra/include/mach; it will be removed whenever Tegra is converted to multi-platform. Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'arch/arm/include/debug')
-rw-r--r--arch/arm/include/debug/tegra.S223
1 files changed, 223 insertions, 0 deletions
diff --git a/arch/arm/include/debug/tegra.S b/arch/arm/include/debug/tegra.S
new file mode 100644
index 000000000000..883d7c22fd9d
--- /dev/null
+++ b/arch/arm/include/debug/tegra.S
@@ -0,0 +1,223 @@
1/*
2 * Copyright (C) 2010,2011 Google, Inc.
3 * Copyright (C) 2011-2012 NVIDIA CORPORATION. All Rights Reserved.
4 *
5 * Author:
6 * Colin Cross <ccross@google.com>
7 * Erik Gilling <konkers@google.com>
8 * Doug Anderson <dianders@chromium.org>
9 * Stephen Warren <swarren@nvidia.com>
10 *
11 * Portions based on mach-omap2's debug-macro.S
12 * Copyright (C) 1994-1999 Russell King
13 *
14 * This software is licensed under the terms of the GNU General Public
15 * License version 2, as published by the Free Software Foundation, and
16 * may be copied, distributed, and modified under those terms.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 */
24
25#include <linux/serial_reg.h>
26
27#define UART_SHIFT 2
28
29/* Physical addresses */
30#define TEGRA_CLK_RESET_BASE 0x60006000
31#define TEGRA_APB_MISC_BASE 0x70000000
32#define TEGRA_UARTA_BASE 0x70006000
33#define TEGRA_UARTB_BASE 0x70006040
34#define TEGRA_UARTC_BASE 0x70006200
35#define TEGRA_UARTD_BASE 0x70006300
36#define TEGRA_UARTE_BASE 0x70006400
37#define TEGRA_PMC_BASE 0x7000e400
38
39#define TEGRA_CLK_RST_DEVICES_L (TEGRA_CLK_RESET_BASE + 0x04)
40#define TEGRA_CLK_RST_DEVICES_H (TEGRA_CLK_RESET_BASE + 0x08)
41#define TEGRA_CLK_RST_DEVICES_U (TEGRA_CLK_RESET_BASE + 0x0c)
42#define TEGRA_CLK_OUT_ENB_L (TEGRA_CLK_RESET_BASE + 0x10)
43#define TEGRA_CLK_OUT_ENB_H (TEGRA_CLK_RESET_BASE + 0x14)
44#define TEGRA_CLK_OUT_ENB_U (TEGRA_CLK_RESET_BASE + 0x18)
45#define TEGRA_PMC_SCRATCH20 (TEGRA_PMC_BASE + 0xa0)
46#define TEGRA_APB_MISC_GP_HIDREV (TEGRA_APB_MISC_BASE + 0x804)
47
48/*
49 * Must be 1MB-aligned since a 1MB mapping is used early on.
50 * Must not overlap with regions in mach-tegra/io.c:tegra_io_desc[].
51 */
52#define UART_VIRTUAL_BASE 0xfe100000
53
54#define checkuart(rp, rv, lhu, bit, uart) \
55 /* Load address of CLK_RST register */ \
56 movw rp, #TEGRA_CLK_RST_DEVICES_##lhu & 0xffff ; \
57 movt rp, #TEGRA_CLK_RST_DEVICES_##lhu >> 16 ; \
58 /* Load value from CLK_RST register */ \
59 ldr rp, [rp, #0] ; \
60 /* Test UART's reset bit */ \
61 tst rp, #(1 << bit) ; \
62 /* If set, can't use UART; jump to save no UART */ \
63 bne 90f ; \
64 /* Load address of CLK_OUT_ENB register */ \
65 movw rp, #TEGRA_CLK_OUT_ENB_##lhu & 0xffff ; \
66 movt rp, #TEGRA_CLK_OUT_ENB_##lhu >> 16 ; \
67 /* Load value from CLK_OUT_ENB register */ \
68 ldr rp, [rp, #0] ; \
69 /* Test UART's clock enable bit */ \
70 tst rp, #(1 << bit) ; \
71 /* If clear, can't use UART; jump to save no UART */ \
72 beq 90f ; \
73 /* Passed all tests, load address of UART registers */ \
74 movw rp, #TEGRA_UART##uart##_BASE & 0xffff ; \
75 movt rp, #TEGRA_UART##uart##_BASE >> 16 ; \
76 /* Jump to save UART address */ \
77 b 91f
78
79 .macro addruart, rp, rv, tmp
80 adr \rp, 99f @ actual addr of 99f
81 ldr \rv, [\rp] @ linked addr is stored there
82 sub \rv, \rv, \rp @ offset between the two
83 ldr \rp, [\rp, #4] @ linked tegra_uart_config
84 sub \tmp, \rp, \rv @ actual tegra_uart_config
85 ldr \rp, [\tmp] @ Load tegra_uart_config
86 cmp \rp, #1 @ needs initialization?
87 bne 100f @ no; go load the addresses
88 mov \rv, #0 @ yes; record init is done
89 str \rv, [\tmp]
90
91#ifdef CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA
92 /* Check ODMDATA */
9310: movw \rp, #TEGRA_PMC_SCRATCH20 & 0xffff
94 movt \rp, #TEGRA_PMC_SCRATCH20 >> 16
95 ldr \rp, [\rp, #0] @ Load PMC_SCRATCH20
96 ubfx \rv, \rp, #18, #2 @ 19:18 are console type
97 cmp \rv, #2 @ 2 and 3 mean DCC, UART
98 beq 11f @ some boards swap the meaning
99 cmp \rv, #3 @ so accept either
100 bne 90f
10111: ubfx \rv, \rp, #15, #3 @ 17:15 are UART ID
102 cmp \rv, #0 @ UART 0?
103 beq 20f
104 cmp \rv, #1 @ UART 1?
105 beq 21f
106 cmp \rv, #2 @ UART 2?
107 beq 22f
108 cmp \rv, #3 @ UART 3?
109 beq 23f
110 cmp \rv, #4 @ UART 4?
111 beq 24f
112 b 90f @ invalid
113#endif
114
115#if defined(CONFIG_TEGRA_DEBUG_UARTA) || \
116 defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
117 /* Check UART A validity */
11820: checkuart(\rp, \rv, L, 6, A)
119#endif
120
121#if defined(CONFIG_TEGRA_DEBUG_UARTB) || \
122 defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
123 /* Check UART B validity */
12421: checkuart(\rp, \rv, L, 7, B)
125#endif
126
127#if defined(CONFIG_TEGRA_DEBUG_UARTC) || \
128 defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
129 /* Check UART C validity */
13022: checkuart(\rp, \rv, H, 23, C)
131#endif
132
133#if defined(CONFIG_TEGRA_DEBUG_UARTD) || \
134 defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
135 /* Check UART D validity */
13623: checkuart(\rp, \rv, U, 1, D)
137#endif
138
139#if defined(CONFIG_TEGRA_DEBUG_UARTE) || \
140 defined(CONFIG_TEGRA_DEBUG_UART_AUTO_ODMDATA)
141 /* Check UART E validity */
14224:
143 checkuart(\rp, \rv, U, 2, E)
144#endif
145
146 /* No valid UART found */
14790: mov \rp, #0
148 /* fall through */
149
150 /* Record whichever UART we chose */
15191: str \rp, [\tmp, #4] @ Store in tegra_uart_phys
152 cmp \rp, #0 @ Valid UART address?
153 bne 92f @ Yes, go process it
154 str \rp, [\tmp, #8] @ Store 0 in tegra_uart_virt
155 b 100f @ Done
15692: and \rv, \rp, #0xffffff @ offset within 1MB section
157 add \rv, \rv, #UART_VIRTUAL_BASE
158 str \rv, [\tmp, #8] @ Store in tegra_uart_virt
159 movw \rv, #TEGRA_APB_MISC_GP_HIDREV & 0xffff
160 movt \rv, #TEGRA_APB_MISC_GP_HIDREV >> 16
161 ldr \rv, [\rv, #0] @ Load HIDREV
162 ubfx \rv, \rv, #8, #8 @ 15:8 are SoC version
163 cmp \rv, #0x20 @ Tegra20?
164 moveq \rv, #0x75 @ Tegra20 divisor
165 movne \rv, #0xdd @ Tegra30 divisor
166 str \rv, [\tmp, #12] @ Save divisor to scratch
167 /* uart[UART_LCR] = UART_LCR_WLEN8 | UART_LCR_DLAB; */
168 mov \rv, #UART_LCR_WLEN8 | UART_LCR_DLAB
169 str \rv, [\rp, #UART_LCR << UART_SHIFT]
170 /* uart[UART_DLL] = div & 0xff; */
171 ldr \rv, [\tmp, #12]
172 and \rv, \rv, #0xff
173 str \rv, [\rp, #UART_DLL << UART_SHIFT]
174 /* uart[UART_DLM] = div >> 8; */
175 ldr \rv, [\tmp, #12]
176 lsr \rv, \rv, #8
177 str \rv, [\rp, #UART_DLM << UART_SHIFT]
178 /* uart[UART_LCR] = UART_LCR_WLEN8; */
179 mov \rv, #UART_LCR_WLEN8
180 str \rv, [\rp, #UART_LCR << UART_SHIFT]
181 b 100f
182
183 .align
18499: .word .
185 .word tegra_uart_config
186 .ltorg
187
188 /* Load previously selected UART address */
189100: ldr \rp, [\tmp, #4] @ Load tegra_uart_phys
190 ldr \rv, [\tmp, #8] @ Load tegra_uart_virt
191 .endm
192
193/*
194 * Code below is swiped from <asm/hardware/debug-8250.S>, but add an extra
195 * check to make sure that the UART address is actually valid.
196 */
197
198 .macro senduart, rd, rx
199 cmp \rx, #0
200 strneb \rd, [\rx, #UART_TX << UART_SHIFT]
2011001:
202 .endm
203
204 .macro busyuart, rd, rx
205 cmp \rx, #0
206 beq 1002f
2071001: ldrb \rd, [\rx, #UART_LSR << UART_SHIFT]
208 and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
209 teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
210 bne 1001b
2111002:
212 .endm
213
214 .macro waituart, rd, rx
215#ifdef FLOW_CONTROL
216 cmp \rx, #0
217 beq 1002f
2181001: ldrb \rd, [\rx, #UART_MSR << UART_SHIFT]
219 tst \rd, #UART_MSR_CTS
220 beq 1001b
2211002:
222#endif
223 .endm
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