134 lines
3.8 KiB
C
134 lines
3.8 KiB
C
/*
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* board.c: STB225 board support.
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*
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* Copyright 2008 NXP Semiconductors
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* Chris Steel <chris.steel@nxp.com>
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* Daniel Laird <daniel.j.laird@nxp.com>
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*
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* Based on software written by:
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* Nikita Youshchenko <yoush@debian.org>, based on PNX8550 code.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <asm/bootinfo.h>
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#include <linux/mm.h>
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#include <pnx833x.h>
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#include <gpio.h>
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/* endianess twiddlers */
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#define PNX8335_DEBUG0 0x4400
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#define PNX8335_DEBUG1 0x4404
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#define PNX8335_DEBUG2 0x4408
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#define PNX8335_DEBUG3 0x440c
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#define PNX8335_DEBUG4 0x4410
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#define PNX8335_DEBUG5 0x4414
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#define PNX8335_DEBUG6 0x4418
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#define PNX8335_DEBUG7 0x441c
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int prom_argc;
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char **prom_argv, **prom_envp;
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extern void prom_init_cmdline(void);
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extern char *prom_getenv(char *envname);
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const char *get_system_type(void)
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{
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return "NXP STB22x";
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}
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static inline unsigned long env_or_default(char *env, unsigned long dfl)
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{
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char *str = prom_getenv(env);
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return str ? simple_strtol(str, 0, 0) : dfl;
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}
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void __init prom_init(void)
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{
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unsigned long memsize;
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prom_argc = fw_arg0;
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prom_argv = (char **)fw_arg1;
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prom_envp = (char **)fw_arg2;
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prom_init_cmdline();
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memsize = env_or_default("memsize", 0x02000000);
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add_memory_region(0, memsize, BOOT_MEM_RAM);
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}
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void __init pnx833x_board_setup(void)
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{
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pnx833x_gpio_select_function_alt(4);
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pnx833x_gpio_select_output(4);
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pnx833x_gpio_select_function_alt(5);
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pnx833x_gpio_select_input(5);
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pnx833x_gpio_select_function_alt(6);
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pnx833x_gpio_select_input(6);
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pnx833x_gpio_select_function_alt(7);
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pnx833x_gpio_select_output(7);
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pnx833x_gpio_select_function_alt(25);
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pnx833x_gpio_select_function_alt(26);
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pnx833x_gpio_select_function_alt(27);
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pnx833x_gpio_select_function_alt(28);
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pnx833x_gpio_select_function_alt(29);
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pnx833x_gpio_select_function_alt(30);
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pnx833x_gpio_select_function_alt(31);
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pnx833x_gpio_select_function_alt(32);
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pnx833x_gpio_select_function_alt(33);
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#if IS_ENABLED(CONFIG_MTD_NAND_PLATFORM)
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/* Setup MIU for NAND access on CS0...
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*
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* (it seems that we must also configure CS1 for reliable operation,
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* otherwise the first read ID command will fail if it's read as 4 bytes
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* but pass if it's read as 1 word.)
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*/
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/* Setup MIU CS0 & CS1 timing */
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PNX833X_MIU_SEL0 = 0;
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PNX833X_MIU_SEL1 = 0;
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PNX833X_MIU_SEL0_TIMING = 0x50003081;
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PNX833X_MIU_SEL1_TIMING = 0x50003081;
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/* Setup GPIO 00 for use as MIU CS1 (CS0 is not multiplexed, so does not need this) */
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pnx833x_gpio_select_function_alt(0);
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/* Setup GPIO 04 to input NAND read/busy signal */
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pnx833x_gpio_select_function_io(4);
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pnx833x_gpio_select_input(4);
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/* Setup GPIO 05 to disable NAND write protect */
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pnx833x_gpio_select_function_io(5);
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pnx833x_gpio_select_output(5);
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pnx833x_gpio_write(1, 5);
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#elif IS_ENABLED(CONFIG_MTD_CFI)
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/* Set up MIU for 16-bit NOR access on CS0 and CS1... */
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/* Setup MIU CS0 & CS1 timing */
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PNX833X_MIU_SEL0 = 1;
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PNX833X_MIU_SEL1 = 1;
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PNX833X_MIU_SEL0_TIMING = 0x6A08D082;
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PNX833X_MIU_SEL1_TIMING = 0x6A08D082;
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/* Setup GPIO 00 for use as MIU CS1 (CS0 is not multiplexed, so does not need this) */
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pnx833x_gpio_select_function_alt(0);
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#endif
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}
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