diff options
Diffstat (limited to 'board/omap2420h4/mem.c')
| -rw-r--r-- | board/omap2420h4/mem.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/board/omap2420h4/mem.c b/board/omap2420h4/mem.c new file mode 100644 index 0000000..a3b3453 --- /dev/null +++ b/board/omap2420h4/mem.c @@ -0,0 +1,306 @@ +/* + * (C) Copyright 2004 + * Texas Instruments, <www.ti.com> + * Richard Woodruff <r-woodruff2@ti.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <asm/arch/omap2420.h> +#include <asm/io.h> +#include <asm/arch/bits.h> +#include <asm/arch/mux.h> +#include <asm/arch/mem.h> +#include <asm/arch/clocks.h> +#include <asm/arch/sys_proto.h> +#include <asm/arch/sys_info.h> + +/************************************************************ + * sdelay() - simple spin loop. Will be constant time as + * its generally used in 12MHz bypass conditions only. This + * is necessary until timers are accessible. + * + * not inline to increase chances its in cache when called + *************************************************************/ +void sdelay (unsigned long loops) +{ + __asm__ volatile ("1:\n" + "subs %0, %1, #1\n" + "bne 1b":"=r" (loops):"0" (loops)); +} + +/********************************************************************************* + * prcm_init() - inits clocks for PRCM as defined in clocks.h (config II default). + * -- called from SRAM, or Flash (using temp SRAM stack). + *********************************************************************************/ +void prcm_init(void) +{ + u32 rev,div; +#ifdef CONFIG_PARTIAL_SRAM + void (*f_lock_pll) (u32, u32, u32, u32); + extern void *_end_vect, *_start; + + f_lock_pll = (void *)((u32)&_end_vect - (u32)&_start + SRAM_VECT_CODE); +#endif + + __raw_writel(0, CM_FCLKEN1_CORE); /* stop all clocks to reduce ringing */ + __raw_writel(0, CM_FCLKEN2_CORE); /* may not be necessary */ + __raw_writel(0, CM_ICLKEN1_CORE); + __raw_writel(0, CM_ICLKEN2_CORE); + + __raw_writel(DPLL_OUT, CM_CLKSEL2_PLL); /* set DPLL out */ + __raw_writel(MPU_DIV, CM_CLKSEL_MPU); /* set MPU divider */ + __raw_writel(DSP_DIV, CM_CLKSEL_DSP); /* set dsp and iva dividers */ + __raw_writel(GFX_DIV, CM_CLKSEL_GFX); /* set gfx dividers */ + + rev = get_cpu_rev(); + if (rev == CPU_2420_ES1 || rev == CPU_2422_ES1) + div = BUS_DIV_ES1; + else + div = BUS_DIV; + __raw_writel(div, CM_CLKSEL1_CORE);/* set L3/L4/USB/Display/Vlnc/SSi dividers */ + sdelay(1000); + +#ifndef CONFIG_PARTIAL_SRAM + /* If running fully from SRAM this is OK. The Flash bus drops out for just a little. + * but then comes back. If running from Flash this sequence kills you, thus you need + * to run it using CONFIG_PARTIAL_SRAM. + */ + __raw_writel(MODE_BYPASS_FAST, CM_CLKEN_PLL); /* go to bypass, fast relock */ + wait_on_value(BIT0|BIT1, BIT1, CM_IDLEST_CKGEN, LDELAY); /* wait till in bypass */ + + /* set clock selection and dpll dividers. */ + __raw_writel(DPLL_VAL, CM_CLKSEL1_PLL); /* set pll for target rate */ + __raw_writel(COMMIT_DIVIDERS, PRCM_CLKCFG_CTRL); /* commit dividers */ + sdelay(10000); + __raw_writel(DPLL_LOCK, CM_CLKEN_PLL); /* enable dpll */ + sdelay(10000); + wait_on_value(BIT0|BIT1, BIT2, CM_IDLEST_CKGEN, LDELAY); /*wait for dpll lock */ +#else +/* if running from flash, need to jump to small relocated code area in SRAM. + * This is the only safe spot to do configurations from. + */ + (*f_lock_pll)(PRCM_CLKCFG_CTRL, CM_CLKEN_PLL, DPLL_LOCK, CM_IDLEST_CKGEN); +#endif + + __raw_writel(DPLL_LOCK|APLL_LOCK, CM_CLKEN_PLL); /* enable apll */ + wait_on_value(BIT8, BIT8, CM_IDLEST_CKGEN, LDELAY); /* wait for apll lock */ + sdelay(1000); +} + +/*********************************************** + * memif_init() - init the gpmc and sdrc + * - early init routines, called from flash or + * SRAM. + ***********************************************/ +void memif_init(void) +{ + sdrc_init(); +#ifndef CONFIG_PARTIAL_SRAM /* don't init if calling from flash */ + gpmc_init(); +#endif +} + +/******************************************************** + * mem_ok() - test used to see if timings are correct + * for a part. Helps in gussing which part + * we are currently using. + *******************************************************/ +u32 mem_ok(void) +{ u32 val; + __raw_writel(0x0,OMAP2420_SDRC_CS0+0x400); /* clear pos A */ + __raw_writel(0x12345678, OMAP2420_SDRC_CS0);/* pattern to pos B */ + val = __raw_readl(OMAP2420_SDRC_CS0+0x400); /* get pos A value */ + if (val != 0) /* see if pos A value changed*/ + return(0); + else + return(1); +} + +/******************************************************** + * sdrc_init() - init the sdrc chip selects CS0 and CS1 + * - early init routines, called from flash or + * SRAM. + *******************************************************/ +void sdrc_init(void) +{ + #define EARLY_INIT 1 + do_sdrc_init(SDRC_CS0_OSET, EARLY_INIT); /* only init up first bank here */ +} + +/********************************************************** + * do_sdrc_init(): initialize the SDRAM for use. + * -called from low level code with stack only. + * -code sets up SDRAM timing and muxing for 2422 or 2420. + * -optimal settings can be placed here, or redone after i2c + * inspection of board info + * + * !!! When ES1 comes out need to conditionalize RFR value!!! + **********************************************************/ +void do_sdrc_init(u32 offset, u32 early) +{ + u32 cpu, bug=0, rev, shared=0, cs0=0, pmask=0,first=1; + sdrc_data_t *sdata; /* do not change type */ + + static const sdrc_data_t sdrc_2422 = + { + H4_2422_SDRC_SHARING, H4_2422_SDRC_MDCFG_0, H4_2422_SDRC_ACTIM_CTRLA_0, + H4_2422_SDRC_ACTIM_CTRLB_0, H4_2422_SDRC_RFR_CTRL_ES1, H4_2422_SDRC_MR_0, + H4_2422_SDRC_DLLA_CTRL, H4_2422_SDRC_DLLB_CTRL + }; + static const sdrc_data_t sdrc_2420 = + { + H4_2420_SDRC_SHARING, H4_2420_SDRC_MDCFG_0, H4_2420_SDRC_ACTIM_CTRLA_0, + H4_2420_SDRC_ACTIM_CTRLB_0, H4_2420_SDRC_RFR_CTRL_ES1, H4_2420_SDRC_MR_0, + H4_2420_SDRC_DLLA_CTRL, H4_2420_SDRC_DLLB_CTRL + }; + + if (offset == SDRC_CS0_OSET) + cs0 = shared = 1; /* int regs shared between both chip select */ + + cpu = get_cpu_type(); + + /* warning generated, though code generation is correct. this may bite later, but is ok for now. + * there is only so much C code you can do on stack only operation. + */ + if (cpu == CPU_2422) + sdata = &sdrc_2422; + else + sdata = &sdrc_2420; + __asm__ __volatile__("": : :"memory"); +#ifdef CONFIG_PARTIAL_SRAM + /* u-boot is compiled to run in DDR at 8xxxxxxx. If we use data here which is not pc relative + * we need to get the address correct. We need to find the current flash mapping to dress up + * the initial pointer load. As long as this is const data we should be ok. + */ + if(early) + sdata = (sdrc_data_t *)(((u32)sdata & 0x0003FFFF) | get_gpmc0_base()); +#endif + + men_combo: + + if (!early && get_mem_type() == DDR_COMBO) { /* combo part has a shared CKE signal, can't use feature */ + pmask = BIT2; + first = 0; /* trigger ddr_combo init */ + } + + if (shared) { + __raw_writel(__raw_readl(SMS_SYSCONFIG)|SMART_IDLE, SMS_SYSCONFIG); + __raw_writel(SMART_IDLE|SOFTRESET, SDRC_SYSCONFIG); /* reset sdrc */ + wait_on_value(BIT0, BIT0, SDRC_STATUS, 12000000); /* wait till reset done set */ + __raw_writel(SMART_IDLE, SDRC_SYSCONFIG); /* clear soft reset */ + __raw_writel(sdata->sdrc_sharing, SDRC_SHARING); + __raw_writel((__raw_readl(SDRC_POWER)|SMART_IDLE) & ~pmask, SDRC_POWER); + } + if (first) + __raw_writel(sdata->sdrc_mdcfg_0, SDRC_MCFG_0+offset); + else { + __raw_writel((__raw_readl(SDRC_POWER)|SMART_IDLE) & ~pmask, SDRC_POWER); + __raw_writel(H4_2420_COMBO_MDCFG_0,SDRC_MCFG_0+offset); + } + + if (cs0) { + __raw_writel(sdata->sdrc_actim_ctrla_0, SDRC_ACTIM_CTRLA_0); + __raw_writel(sdata->sdrc_actim_ctrlb_0, SDRC_ACTIM_CTRLB_0); + } else { + __raw_writel(sdata->sdrc_actim_ctrla_0, SDRC_ACTIM_CTRLA_1); + __raw_writel(sdata->sdrc_actim_ctrlb_0, SDRC_ACTIM_CTRLB_1); + } + + __raw_writel(sdata->sdrc_rfr_ctrl, SDRC_RFR_CTRL+offset); + + /* init sequence for _mDDR_ using manual commands (DDR is a bit different) */ + __raw_writel(CMD_NOP, SDRC_MANUAL_0+offset); + sdelay(5000); /* susposed to be 100us per design spec for mddr*/ + __raw_writel(CMD_PRECHARGE, SDRC_MANUAL_0+offset); + __raw_writel(CMD_AUTOREFRESH, SDRC_MANUAL_0+offset); + __raw_writel(CMD_AUTOREFRESH, SDRC_MANUAL_0+offset); + + /* + * CSx SDRC Mode Register + * Burst length = 4 - DDR memory + * Serial mode + * CAS latency = x + */ + __raw_writel(sdata->sdrc_mr_0, SDRC_MR_0+offset); + + /* NOTE: ES1 242x _BUG_ DLL */ + rev = get_cpu_rev(); + if (rev == CPU_2420_ES1 || rev == CPU_2422_ES1) + bug = BIT0; + /* enable & load up DLL with good value for 75MHz, and set phase to 90% */ + if (shared) { + __raw_writel(sdata->sdrc_dlla_ctrl, SDRC_DLLA_CTRL); + __raw_writel(sdata->sdrc_dlla_ctrl & ~(BIT2|bug), SDRC_DLLA_CTRL); + __raw_writel(sdata->sdrc_dllb_ctrl, SDRC_DLLB_CTRL); + __raw_writel(sdata->sdrc_dllb_ctrl & ~(BIT2|bug) , SDRC_DLLB_CTRL); + } + sdelay(9000); + if (!first || mem_ok()) /* passed test or 2nd bank init */ + return; + else { + first = 0; + goto men_combo; + } +} + + +/***************************************************** + * gpmc_init(): init gpmc bus + * Init GPMC for x16, MuxMode (SDRAM in x32). + * This code can only be executed from SRAM or SDRAM. + *****************************************************/ +void gpmc_init(void) +{ + u32 mux=0, mtype, mwidth; + + /* global settings */ + __raw_writel(0x10, GPMC_SYSCONFIG); /* smart idle */ + __raw_writel(0x0, GPMC_IRQENABLE); /* isr's sources masked */ + __raw_writel(0x1, GPMC_TIMEOUT_CONTROL);/* timeout disable */ + __raw_writel(0x111, GPMC_CONFIG); /* set nWP, disable limited addr */ + + /* discover bus connection from sysboot */ + if (is_gpmc_muxed() == GPMC_MUXED) + mux = BIT9; + mtype = get_gpmc0_type(); + mwidth = get_gpmc0_width(); + + /* setup cs0 */ + __raw_writel(0x0, GPMC_CONFIG7_0); /* disable current map */ + sdelay(1000); + __raw_writel(H4_24XX_GPMC_CONFIG1_0|mux|mtype|mwidth, GPMC_CONFIG1_0); + //__raw_writel(H4_24XX_GPMC_CONFIG2_0, GPMC_CONFIG2_0); + __raw_writel(H4_24XX_GPMC_CONFIG3_0, GPMC_CONFIG3_0); + __raw_writel(H4_24XX_GPMC_CONFIG4_0, GPMC_CONFIG4_0); + //__raw_writel(H4_24XX_GPMC_CONFIG5_0, GPMC_CONFIG5_0); + __raw_writel(H4_24XX_GPMC_CONFIG7_0, GPMC_CONFIG7_0);/* enable new mapping */ + sdelay(2000); + + /* setup cs1 */ + __raw_writel(0, GPMC_CONFIG7_1); /* disable any mapping */ + sdelay(1000); + __raw_writel(H4_24XX_GPMC_CONFIG1_1|mux, GPMC_CONFIG1_1); + __raw_writel(H4_24XX_GPMC_CONFIG2_1, GPMC_CONFIG2_1); + __raw_writel(H4_24XX_GPMC_CONFIG3_1, GPMC_CONFIG3_1); + __raw_writel(H4_24XX_GPMC_CONFIG4_1, GPMC_CONFIG4_1); + __raw_writel(H4_24XX_GPMC_CONFIG5_1, GPMC_CONFIG5_1); + __raw_writel(H4_24XX_GPMC_CONFIG6_1, GPMC_CONFIG6_1); + __raw_writel(H4_24XX_GPMC_CONFIG7_1, GPMC_CONFIG7_1); /* enable mapping */ + sdelay(2000); +} + |