Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 1 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2 | * udbg for NS16550 compatible serial ports |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2001-2005 PPC 64 Team, IBM Corp |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 11 | #include <linux/types.h> |
Milton Miller | 188d2ce | 2005-09-06 11:57:00 +1000 | [diff] [blame] | 12 | #include <asm/udbg.h> |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 13 | #include <asm/io.h> |
Jack Miller | a0496d4 | 2011-04-14 22:32:08 +0000 | [diff] [blame] | 14 | #include <asm/reg_a2.h> |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 15 | |
| 16 | extern u8 real_readb(volatile u8 __iomem *addr); |
| 17 | extern void real_writeb(u8 data, volatile u8 __iomem *addr); |
Olof Johansson | 39c870d5 | 2007-02-04 16:36:49 -0600 | [diff] [blame] | 18 | extern u8 real_205_readb(volatile u8 __iomem *addr); |
| 19 | extern void real_205_writeb(u8 data, volatile u8 __iomem *addr); |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 20 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 21 | #define UART_RBR 0 |
| 22 | #define UART_IER 1 |
| 23 | #define UART_FCR 2 |
| 24 | #define UART_LCR 3 |
| 25 | #define UART_MCR 4 |
| 26 | #define UART_LSR 5 |
| 27 | #define UART_MSR 6 |
| 28 | #define UART_SCR 7 |
| 29 | #define UART_THR UART_RBR |
| 30 | #define UART_IIR UART_FCR |
| 31 | #define UART_DLL UART_RBR |
| 32 | #define UART_DLM UART_IER |
| 33 | #define UART_DLAB UART_LCR |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 34 | |
| 35 | #define LSR_DR 0x01 /* Data ready */ |
| 36 | #define LSR_OE 0x02 /* Overrun */ |
| 37 | #define LSR_PE 0x04 /* Parity error */ |
| 38 | #define LSR_FE 0x08 /* Framing error */ |
| 39 | #define LSR_BI 0x10 /* Break */ |
| 40 | #define LSR_THRE 0x20 /* Xmit holding register empty */ |
| 41 | #define LSR_TEMT 0x40 /* Xmitter empty */ |
| 42 | #define LSR_ERR 0x80 /* Error */ |
| 43 | |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 44 | #define LCR_DLAB 0x80 |
| 45 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 46 | static u8 (*udbg_uart_in)(unsigned int reg); |
| 47 | static void (*udbg_uart_out)(unsigned int reg, u8 data); |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 48 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 49 | static void udbg_uart_flush(void) |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 50 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 51 | if (!udbg_uart_in) |
| 52 | return; |
| 53 | |
| 54 | /* wait for idle */ |
| 55 | while ((udbg_uart_in(UART_LSR) & LSR_THRE) == 0) |
| 56 | cpu_relax(); |
Andrew Klossner | af9c724 | 2009-03-09 07:52:41 +0000 | [diff] [blame] | 57 | } |
| 58 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 59 | static void udbg_uart_putc(char c) |
Andrew Klossner | af9c724 | 2009-03-09 07:52:41 +0000 | [diff] [blame] | 60 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 61 | if (!udbg_uart_out) |
| 62 | return; |
| 63 | |
| 64 | if (c == '\n') |
| 65 | udbg_uart_putc('\r'); |
| 66 | udbg_uart_flush(); |
| 67 | udbg_uart_out(UART_THR, c); |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 68 | } |
| 69 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 70 | static int udbg_uart_getc_poll(void) |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 71 | { |
Anton Blanchard | cd32e2d | 2014-11-11 09:12:28 +1100 | [diff] [blame] | 72 | if (!udbg_uart_in) |
| 73 | return -1; |
| 74 | |
| 75 | if (!(udbg_uart_in(UART_LSR) & LSR_DR)) |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 76 | return udbg_uart_in(UART_RBR); |
Anton Blanchard | cd32e2d | 2014-11-11 09:12:28 +1100 | [diff] [blame] | 77 | |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 78 | return -1; |
| 79 | } |
| 80 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 81 | static int udbg_uart_getc(void) |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 82 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 83 | if (!udbg_uart_in) |
| 84 | return -1; |
| 85 | /* wait for char */ |
| 86 | while (!(udbg_uart_in(UART_LSR) & LSR_DR)) |
| 87 | cpu_relax(); |
| 88 | return udbg_uart_in(UART_RBR); |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 89 | } |
| 90 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 91 | static void udbg_use_uart(void) |
| 92 | { |
| 93 | udbg_putc = udbg_uart_putc; |
| 94 | udbg_flush = udbg_uart_flush; |
| 95 | udbg_getc = udbg_uart_getc; |
| 96 | udbg_getc_poll = udbg_uart_getc_poll; |
| 97 | } |
| 98 | |
| 99 | void udbg_uart_setup(unsigned int speed, unsigned int clock) |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 100 | { |
Benjamin Herrenschmidt | 171505d | 2006-07-04 14:11:23 +1000 | [diff] [blame] | 101 | unsigned int dll, base_bauds; |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 102 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 103 | if (!udbg_uart_out) |
| 104 | return; |
| 105 | |
Benjamin Herrenschmidt | 171505d | 2006-07-04 14:11:23 +1000 | [diff] [blame] | 106 | if (clock == 0) |
| 107 | clock = 1843200; |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 108 | if (speed == 0) |
| 109 | speed = 9600; |
Benjamin Herrenschmidt | 171505d | 2006-07-04 14:11:23 +1000 | [diff] [blame] | 110 | |
| 111 | base_bauds = clock / 16; |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 112 | dll = base_bauds / speed; |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 113 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 114 | udbg_uart_out(UART_LCR, 0x00); |
| 115 | udbg_uart_out(UART_IER, 0xff); |
| 116 | udbg_uart_out(UART_IER, 0x00); |
| 117 | udbg_uart_out(UART_LCR, LCR_DLAB); |
| 118 | udbg_uart_out(UART_DLL, dll & 0xff); |
| 119 | udbg_uart_out(UART_DLM, dll >> 8); |
| 120 | /* 8 data, 1 stop, no parity */ |
| 121 | udbg_uart_out(UART_LCR, 0x3); |
| 122 | /* RTS/DTR */ |
| 123 | udbg_uart_out(UART_MCR, 0x3); |
| 124 | /* Clear & enable FIFOs */ |
| 125 | udbg_uart_out(UART_FCR, 0x7); |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 126 | } |
| 127 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 128 | unsigned int udbg_probe_uart_speed(unsigned int clock) |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 129 | { |
| 130 | unsigned int dll, dlm, divisor, prescaler, speed; |
| 131 | u8 old_lcr; |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 132 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 133 | old_lcr = udbg_uart_in(UART_LCR); |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 134 | |
| 135 | /* select divisor latch registers. */ |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 136 | udbg_uart_out(UART_LCR, old_lcr | LCR_DLAB); |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 137 | |
| 138 | /* now, read the divisor */ |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 139 | dll = udbg_uart_in(UART_DLL); |
| 140 | dlm = udbg_uart_in(UART_DLM); |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 141 | divisor = dlm << 8 | dll; |
| 142 | |
| 143 | /* check prescaling */ |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 144 | if (udbg_uart_in(UART_MCR) & 0x80) |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 145 | prescaler = 4; |
| 146 | else |
| 147 | prescaler = 1; |
| 148 | |
| 149 | /* restore the LCR */ |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 150 | udbg_uart_out(UART_LCR, old_lcr); |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 151 | |
| 152 | /* calculate speed */ |
| 153 | speed = (clock / prescaler) / (divisor * 16); |
| 154 | |
| 155 | /* sanity check */ |
roel kluin | bb5e649 | 2008-10-14 14:36:31 +0000 | [diff] [blame] | 156 | if (speed > (clock / 16)) |
Benjamin Herrenschmidt | 463ce0e | 2005-11-23 17:56:06 +1100 | [diff] [blame] | 157 | speed = 9600; |
| 158 | |
| 159 | return speed; |
| 160 | } |
| 161 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 162 | static union { |
| 163 | unsigned char __iomem *mmio_base; |
| 164 | unsigned long pio_base; |
| 165 | } udbg_uart; |
| 166 | |
| 167 | static unsigned int udbg_uart_stride = 1; |
| 168 | |
| 169 | static u8 udbg_uart_in_pio(unsigned int reg) |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 170 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 171 | return inb(udbg_uart.pio_base + (reg * udbg_uart_stride)); |
Andrew Klossner | af9c724 | 2009-03-09 07:52:41 +0000 | [diff] [blame] | 172 | } |
| 173 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 174 | static void udbg_uart_out_pio(unsigned int reg, u8 data) |
Andrew Klossner | af9c724 | 2009-03-09 07:52:41 +0000 | [diff] [blame] | 175 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 176 | outb(data, udbg_uart.pio_base + (reg * udbg_uart_stride)); |
| 177 | } |
| 178 | |
| 179 | void udbg_uart_init_pio(unsigned long port, unsigned int stride) |
| 180 | { |
| 181 | if (!port) |
| 182 | return; |
| 183 | udbg_uart.pio_base = port; |
| 184 | udbg_uart_stride = stride; |
| 185 | udbg_uart_in = udbg_uart_in_pio; |
| 186 | udbg_uart_out = udbg_uart_out_pio; |
| 187 | udbg_use_uart(); |
| 188 | } |
| 189 | |
| 190 | static u8 udbg_uart_in_mmio(unsigned int reg) |
| 191 | { |
| 192 | return in_8(udbg_uart.mmio_base + (reg * udbg_uart_stride)); |
| 193 | } |
| 194 | |
| 195 | static void udbg_uart_out_mmio(unsigned int reg, u8 data) |
| 196 | { |
| 197 | out_8(udbg_uart.mmio_base + (reg * udbg_uart_stride), data); |
| 198 | } |
| 199 | |
| 200 | |
| 201 | void udbg_uart_init_mmio(void __iomem *addr, unsigned int stride) |
| 202 | { |
| 203 | if (!addr) |
| 204 | return; |
| 205 | udbg_uart.mmio_base = addr; |
| 206 | udbg_uart_stride = stride; |
| 207 | udbg_uart_in = udbg_uart_in_mmio; |
| 208 | udbg_uart_out = udbg_uart_out_mmio; |
| 209 | udbg_use_uart(); |
| 210 | } |
| 211 | |
| 212 | #ifdef CONFIG_PPC_MAPLE |
| 213 | |
| 214 | #define UDBG_UART_MAPLE_ADDR ((void __iomem *)0xf40003f8) |
| 215 | |
| 216 | static u8 udbg_uart_in_maple(unsigned int reg) |
| 217 | { |
| 218 | return real_readb(UDBG_UART_MAPLE_ADDR + reg); |
| 219 | } |
| 220 | |
| 221 | static void udbg_uart_out_maple(unsigned int reg, u8 val) |
| 222 | { |
| 223 | real_writeb(val, UDBG_UART_MAPLE_ADDR + reg); |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 224 | } |
| 225 | |
Michael Ellerman | 296167a | 2006-01-11 11:54:09 +1100 | [diff] [blame] | 226 | void __init udbg_init_maple_realmode(void) |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 227 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 228 | udbg_uart_in = udbg_uart_in_maple; |
| 229 | udbg_uart_out = udbg_uart_out_maple; |
| 230 | udbg_use_uart(); |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 231 | } |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 232 | |
Milton Miller | 7f85335 | 2005-09-06 11:56:02 +1000 | [diff] [blame] | 233 | #endif /* CONFIG_PPC_MAPLE */ |
Olof Johansson | 39c870d5 | 2007-02-04 16:36:49 -0600 | [diff] [blame] | 234 | |
| 235 | #ifdef CONFIG_PPC_PASEMI |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 236 | |
| 237 | #define UDBG_UART_PAS_ADDR ((void __iomem *)0xfcff03f8UL) |
| 238 | |
| 239 | static u8 udbg_uart_in_pas(unsigned int reg) |
Olof Johansson | 39c870d5 | 2007-02-04 16:36:49 -0600 | [diff] [blame] | 240 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 241 | return real_205_readb(UDBG_UART_PAS_ADDR + reg); |
Andrew Klossner | af9c724 | 2009-03-09 07:52:41 +0000 | [diff] [blame] | 242 | } |
| 243 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 244 | static void udbg_uart_out_pas(unsigned int reg, u8 val) |
Andrew Klossner | af9c724 | 2009-03-09 07:52:41 +0000 | [diff] [blame] | 245 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 246 | real_205_writeb(val, UDBG_UART_PAS_ADDR + reg); |
Olof Johansson | 39c870d5 | 2007-02-04 16:36:49 -0600 | [diff] [blame] | 247 | } |
| 248 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 249 | void __init udbg_init_pas_realmode(void) |
Olof Johansson | 39c870d5 | 2007-02-04 16:36:49 -0600 | [diff] [blame] | 250 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 251 | udbg_uart_in = udbg_uart_in_pas; |
| 252 | udbg_uart_out = udbg_uart_out_pas; |
| 253 | udbg_use_uart(); |
Olof Johansson | 39c870d5 | 2007-02-04 16:36:49 -0600 | [diff] [blame] | 254 | } |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 255 | |
| 256 | #endif /* CONFIG_PPC_PASEMI */ |
David Gibson | d9b55a0 | 2007-05-08 12:59:31 +1000 | [diff] [blame] | 257 | |
| 258 | #ifdef CONFIG_PPC_EARLY_DEBUG_44x |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 259 | |
David Gibson | d9b55a0 | 2007-05-08 12:59:31 +1000 | [diff] [blame] | 260 | #include <platforms/44x/44x.h> |
| 261 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 262 | static u8 udbg_uart_in_44x_as1(unsigned int reg) |
David Gibson | d9b55a0 | 2007-05-08 12:59:31 +1000 | [diff] [blame] | 263 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 264 | return as1_readb((void __iomem *)PPC44x_EARLY_DEBUG_VIRTADDR + reg); |
Andrew Klossner | af9c724 | 2009-03-09 07:52:41 +0000 | [diff] [blame] | 265 | } |
| 266 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 267 | static void udbg_uart_out_44x_as1(unsigned int reg, u8 val) |
Andrew Klossner | af9c724 | 2009-03-09 07:52:41 +0000 | [diff] [blame] | 268 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 269 | as1_writeb(val, (void __iomem *)PPC44x_EARLY_DEBUG_VIRTADDR + reg); |
Hollis Blanchard | 70dea47 | 2007-09-17 05:56:47 -0500 | [diff] [blame] | 270 | } |
| 271 | |
David Gibson | d9b55a0 | 2007-05-08 12:59:31 +1000 | [diff] [blame] | 272 | void __init udbg_init_44x_as1(void) |
| 273 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 274 | udbg_uart_in = udbg_uart_in_44x_as1; |
| 275 | udbg_uart_out = udbg_uart_out_44x_as1; |
| 276 | udbg_use_uart(); |
David Gibson | d9b55a0 | 2007-05-08 12:59:31 +1000 | [diff] [blame] | 277 | } |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 278 | |
David Gibson | d9b55a0 | 2007-05-08 12:59:31 +1000 | [diff] [blame] | 279 | #endif /* CONFIG_PPC_EARLY_DEBUG_44x */ |
Benjamin Herrenschmidt | 9dae8af | 2007-12-21 15:39:26 +1100 | [diff] [blame] | 280 | |
| 281 | #ifdef CONFIG_PPC_EARLY_DEBUG_40x |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 282 | |
| 283 | static u8 udbg_uart_in_40x(unsigned int reg) |
Benjamin Herrenschmidt | 9dae8af | 2007-12-21 15:39:26 +1100 | [diff] [blame] | 284 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 285 | return real_readb((void __iomem *)CONFIG_PPC_EARLY_DEBUG_40x_PHYSADDR |
| 286 | + reg); |
Andrew Klossner | af9c724 | 2009-03-09 07:52:41 +0000 | [diff] [blame] | 287 | } |
| 288 | |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 289 | static void udbg_uart_out_40x(unsigned int reg, u8 val) |
Andrew Klossner | af9c724 | 2009-03-09 07:52:41 +0000 | [diff] [blame] | 290 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 291 | real_writeb(val, (void __iomem *)CONFIG_PPC_EARLY_DEBUG_40x_PHYSADDR |
| 292 | + reg); |
Benjamin Herrenschmidt | 9dae8af | 2007-12-21 15:39:26 +1100 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | void __init udbg_init_40x_realmode(void) |
| 296 | { |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 297 | udbg_uart_in = udbg_uart_in_40x; |
| 298 | udbg_uart_out = udbg_uart_out_40x; |
| 299 | udbg_use_uart(); |
Benjamin Herrenschmidt | 9dae8af | 2007-12-21 15:39:26 +1100 | [diff] [blame] | 300 | } |
Benjamin Herrenschmidt | 3092574 | 2013-07-15 13:03:12 +1000 | [diff] [blame] | 301 | |
Benjamin Herrenschmidt | 9dae8af | 2007-12-21 15:39:26 +1100 | [diff] [blame] | 302 | #endif /* CONFIG_PPC_EARLY_DEBUG_40x */ |