118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/**
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* @file
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* @brief Provide Generic GPMC configuration option
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*
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* FileName: arch/arm/mach-omap/gpmc.c
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*
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* This file contains the generic GPMC implementation
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*
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*/
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/*
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* (C) Copyright 2008
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* Texas Instruments, <www.ti.com>
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* Nishanth Menon <x0nishan@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <init.h>
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#include <asm/io.h>
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#include <mach/silicon.h>
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#include <mach/gpmc.h>
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#include <mach/sys_info.h>
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#include <mach/syslib.h>
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/**
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* @brief Do a Generic initialization of GPMC. if you choose otherwise,
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* Use gpmc registers to modify the values. The defaults configured are:
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* No idle, L3 free running, no timeout and no IRQs.
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* we allow for gpmc_config data to be programmed, and will also disable
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* ALL CS configurations
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*
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* @param cfg - GPMC_CFG register value
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*
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* @return void
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*/
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void gpmc_generic_init(unsigned int cfg)
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{
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unsigned int reg = GPMC_REG(CONFIG7_0);
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char x = 0;
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debug("gpmccfg=%x\n", cfg);
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/* Generic Configurations */
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/* No idle, L3 clock free running */
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writel(0x10, GPMC_REG(SYS_CONFIG));
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/* No Timeout */
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writel(0x00, GPMC_REG(TIMEOUT_CONTROL));
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/* No IRQs */
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writel(0x00, GPMC_REG(IRQ_ENABLE));
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/* Write the gpmc_config value */
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writel(cfg, GPMC_REG(CFG));
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/* Disable all CS - prevents remaps
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* But NEVER run me in XIP mode! I will Die!
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*/
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while (x < GPMC_NUM_CS) {
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debug("gpmccs=%d Reg:%x <-0x0\n", x, reg);
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writel(0x0, reg);
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reg += GPMC_CONFIG_CS_SIZE;
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x++;
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}
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/* Give me a while to settle things down */
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mdelay(1);
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}
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EXPORT_SYMBOL(gpmc_generic_init);
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/**
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* @brief Configure the registers and enable a single CS.
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*
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* @param cs chip select index
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* @param config gpmc_config structure describing the CS params
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*
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* @return void
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*/
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void gpmc_cs_config(char cs, struct gpmc_config *config)
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{
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unsigned int reg = GPMC_REG(CONFIG1_0) + (cs * GPMC_CONFIG_CS_SIZE);
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unsigned char x = 0;
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debug("gpmccs=%x cfg=%x\n", cs, (unsigned int)config);
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/* Disable the CS before reconfiguring */
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writel(0x0, GPMC_REG(CONFIG7_0) + (cs * GPMC_CONFIG_CS_SIZE));
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mdelay(1); /* Settling time */
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/* Write the CFG1-6 regs */
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while (x < 6) {
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debug("gpmccfg=%d Reg:%x <-0x%x\n",
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x, reg, config->cfg[x]);
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writel(config->cfg[x], reg);
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reg += GPMC_CONFIG_REG_OFF;
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x++;
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}
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/* reg now points to CFG7 */
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debug("gpmccfg=%d Reg:%x <-0x%x\n",
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x, reg, (0x1 << 6) | /* CS enable */
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((config->size & 0xF) << 8) | /* Size */
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((config->base >> 24) & 0x3F));
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writel((0x1 << 6) | /* CS enable */
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((config->size & 0xF) << 8) | /* Size */
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((config->base >> 24) & 0x3F), /* Address */
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reg);
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mdelay(1); /* Settling time */
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}
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EXPORT_SYMBOL(gpmc_cs_config);
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