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
41int prom_argc;
42char **prom_argv, **prom_envp;
43
44extern void prom_init_cmdline(void);
45extern char *prom_getenv(char *envname);
46
47const char *get_system_type(void)
48{
49	return "NXP STB22x";
50}
51
52static 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
58void __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
72void __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