1 /*
2 * board.c: STB225 board support.
3 *
4 * Copyright 2008 NXP Semiconductors
5 * Chris Steel <chris.steel@nxp.com>
6 * Daniel Laird <daniel.j.laird@nxp.com>
7 *
8 * Based on software written by:
9 * Nikita Youshchenko <yoush@debian.org>, based on PNX8550 code.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25 #include <linux/init.h>
26 #include <asm/bootinfo.h>
27 #include <linux/mm.h>
28 #include <pnx833x.h>
29 #include <gpio.h>
30
31 /* endianess twiddlers */
32 #define PNX8335_DEBUG0 0x4400
33 #define PNX8335_DEBUG1 0x4404
34 #define PNX8335_DEBUG2 0x4408
35 #define PNX8335_DEBUG3 0x440c
36 #define PNX8335_DEBUG4 0x4410
37 #define PNX8335_DEBUG5 0x4414
38 #define PNX8335_DEBUG6 0x4418
39 #define PNX8335_DEBUG7 0x441c
40
41 int prom_argc;
42 char **prom_argv, **prom_envp;
43
44 extern void prom_init_cmdline(void);
45 extern char *prom_getenv(char *envname);
46
get_system_type(void)47 const char *get_system_type(void)
48 {
49 return "NXP STB22x";
50 }
51
env_or_default(char * env,unsigned long dfl)52 static inline unsigned long env_or_default(char *env, unsigned long dfl)
53 {
54 char *str = prom_getenv(env);
55 return str ? simple_strtol(str, 0, 0) : dfl;
56 }
57
prom_init(void)58 void __init prom_init(void)
59 {
60 unsigned long memsize;
61
62 prom_argc = fw_arg0;
63 prom_argv = (char **)fw_arg1;
64 prom_envp = (char **)fw_arg2;
65
66 prom_init_cmdline();
67
68 memsize = env_or_default("memsize", 0x02000000);
69 add_memory_region(0, memsize, BOOT_MEM_RAM);
70 }
71
pnx833x_board_setup(void)72 void __init pnx833x_board_setup(void)
73 {
74 pnx833x_gpio_select_function_alt(4);
75 pnx833x_gpio_select_output(4);
76 pnx833x_gpio_select_function_alt(5);
77 pnx833x_gpio_select_input(5);
78 pnx833x_gpio_select_function_alt(6);
79 pnx833x_gpio_select_input(6);
80 pnx833x_gpio_select_function_alt(7);
81 pnx833x_gpio_select_output(7);
82
83 pnx833x_gpio_select_function_alt(25);
84 pnx833x_gpio_select_function_alt(26);
85
86 pnx833x_gpio_select_function_alt(27);
87 pnx833x_gpio_select_function_alt(28);
88 pnx833x_gpio_select_function_alt(29);
89 pnx833x_gpio_select_function_alt(30);
90 pnx833x_gpio_select_function_alt(31);
91 pnx833x_gpio_select_function_alt(32);
92 pnx833x_gpio_select_function_alt(33);
93
94 #if IS_ENABLED(CONFIG_MTD_NAND_PLATFORM)
95 /* Setup MIU for NAND access on CS0...
96 *
97 * (it seems that we must also configure CS1 for reliable operation,
98 * otherwise the first read ID command will fail if it's read as 4 bytes
99 * but pass if it's read as 1 word.)
100 */
101
102 /* Setup MIU CS0 & CS1 timing */
103 PNX833X_MIU_SEL0 = 0;
104 PNX833X_MIU_SEL1 = 0;
105 PNX833X_MIU_SEL0_TIMING = 0x50003081;
106 PNX833X_MIU_SEL1_TIMING = 0x50003081;
107
108 /* Setup GPIO 00 for use as MIU CS1 (CS0 is not multiplexed, so does not need this) */
109 pnx833x_gpio_select_function_alt(0);
110
111 /* Setup GPIO 04 to input NAND read/busy signal */
112 pnx833x_gpio_select_function_io(4);
113 pnx833x_gpio_select_input(4);
114
115 /* Setup GPIO 05 to disable NAND write protect */
116 pnx833x_gpio_select_function_io(5);
117 pnx833x_gpio_select_output(5);
118 pnx833x_gpio_write(1, 5);
119
120 #elif IS_ENABLED(CONFIG_MTD_CFI)
121
122 /* Set up MIU for 16-bit NOR access on CS0 and CS1... */
123
124 /* Setup MIU CS0 & CS1 timing */
125 PNX833X_MIU_SEL0 = 1;
126 PNX833X_MIU_SEL1 = 1;
127 PNX833X_MIU_SEL0_TIMING = 0x6A08D082;
128 PNX833X_MIU_SEL1_TIMING = 0x6A08D082;
129
130 /* Setup GPIO 00 for use as MIU CS1 (CS0 is not multiplexed, so does not need this) */
131 pnx833x_gpio_select_function_alt(0);
132 #endif
133 }
134