arch/mips/pnx833x/stb22x/board.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  board.c: STB225 board support.
   4  *
   5  *  Copyright 2008 NXP Semiconductors
   6  *        Chris Steel <chris.steel@nxp.com>
   7  *    Daniel Laird <daniel.j.laird@nxp.com>
   8  *
   9  *  Based on software written by:
  10  *      Nikita Youshchenko <yoush@debian.org>, based on PNX8550 code.
  11  */
  12 #include <linux/init.h>
  13 #include <asm/bootinfo.h>
  14 #include <linux/mm.h>
  15 #include <pnx833x.h>
  16 #include <gpio.h>
  17
  18 /* endianess twiddlers */
  19 #define PNX8335_DEBUG0 0x4400
  20 #define PNX8335_DEBUG1 0x4404
  21 #define PNX8335_DEBUG2 0x4408
  22 #define PNX8335_DEBUG3 0x440c
  23 #define PNX8335_DEBUG4 0x4410
  24 #define PNX8335_DEBUG5 0x4414
  25 #define PNX8335_DEBUG6 0x4418
  26 #define PNX8335_DEBUG7 0x441c
  27
  28 int prom_argc;
  29 char **prom_argv, **prom_envp;
  30
  31 extern void prom_init_cmdline(void);
  32 extern char *prom_getenv(char *envname);
  33
  34 const char *get_system_type(void)
  35 {
  36         return "NXP STB22x";
  37 }
  38
  39 static inline unsigned long env_or_default(char *env, unsigned long dfl)
  40 {
  41         char *str = prom_getenv(env);
  42         return str ? simple_strtol(str, 0, 0) : dfl;
  43 }
  44
  45 void __init prom_init(void)
  46 {
  47         unsigned long memsize;
  48
  49         prom_argc = fw_arg0;
  50         prom_argv = (char **)fw_arg1;
  51         prom_envp = (char **)fw_arg2;
  52
  53         prom_init_cmdline();
  54
  55         memsize = env_or_default("memsize", 0x02000000);
  56         add_memory_region(0, memsize, BOOT_MEM_RAM);
  57 }
  58
  59 void __init pnx833x_board_setup(void)
  60 {
  61         pnx833x_gpio_select_function_alt(4);
  62         pnx833x_gpio_select_output(4);
  63         pnx833x_gpio_select_function_alt(5);
  64         pnx833x_gpio_select_input(5);
  65         pnx833x_gpio_select_function_alt(6);
  66         pnx833x_gpio_select_input(6);
  67         pnx833x_gpio_select_function_alt(7);
  68         pnx833x_gpio_select_output(7);
  69
  70         pnx833x_gpio_select_function_alt(25);
  71         pnx833x_gpio_select_function_alt(26);
  72
  73         pnx833x_gpio_select_function_alt(27);
  74         pnx833x_gpio_select_function_alt(28);
  75         pnx833x_gpio_select_function_alt(29);
  76         pnx833x_gpio_select_function_alt(30);
  77         pnx833x_gpio_select_function_alt(31);
  78         pnx833x_gpio_select_function_alt(32);
  79         pnx833x_gpio_select_function_alt(33);
  80
  81 #if IS_ENABLED(CONFIG_MTD_NAND_PLATFORM)
  82         /* Setup MIU for NAND access on CS0...
  83          *
  84          * (it seems that we must also configure CS1 for reliable operation,
  85          * otherwise the first read ID command will fail if it's read as 4 bytes
  86          * but pass if it's read as 1 word.)
  87          */
  88
  89         /* Setup MIU CS0 & CS1 timing */
  90         PNX833X_MIU_SEL0 = 0;
  91         PNX833X_MIU_SEL1 = 0;
  92         PNX833X_MIU_SEL0_TIMING = 0x50003081;
  93         PNX833X_MIU_SEL1_TIMING = 0x50003081;
  94
  95         /* Setup GPIO 00 for use as MIU CS1 (CS0 is not multiplexed, so does not need this) */
  96         pnx833x_gpio_select_function_alt(0);
  97
  98         /* Setup GPIO 04 to input NAND read/busy signal */
  99         pnx833x_gpio_select_function_io(4);
 100         pnx833x_gpio_select_input(4);
 101
 102         /* Setup GPIO 05 to disable NAND write protect */
 103         pnx833x_gpio_select_function_io(5);
 104         pnx833x_gpio_select_output(5);
 105         pnx833x_gpio_write(1, 5);
 106
 107 #elif IS_ENABLED(CONFIG_MTD_CFI)
 108
 109         /* Set up MIU for 16-bit NOR access on CS0 and CS1... */
 110
 111         /* Setup MIU CS0 & CS1 timing */
 112         PNX833X_MIU_SEL0 = 1;
 113         PNX833X_MIU_SEL1 = 1;
 114         PNX833X_MIU_SEL0_TIMING = 0x6A08D082;
 115         PNX833X_MIU_SEL1_TIMING = 0x6A08D082;
 116
 117         /* Setup GPIO 00 for use as MIU CS1 (CS0 is not multiplexed, so does not need this) */
 118         pnx833x_gpio_select_function_alt(0);
 119 #endif
 120 }