diff options
Diffstat (limited to 'u-boot/board/ti/omap2420h4/mem.c')
| -rw-r--r-- | u-boot/board/ti/omap2420h4/mem.c | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/u-boot/board/ti/omap2420h4/mem.c b/u-boot/board/ti/omap2420h4/mem.c new file mode 100644 index 0000000..c8b4186 --- /dev/null +++ b/u-boot/board/ti/omap2420h4/mem.c @@ -0,0 +1,375 @@ +/* + * (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 div; + 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); + + __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 */ + + div = BUS_DIV; + __raw_writel(div, CM_CLKSEL1_CORE);/* set L3/L4/USB/Display/Vlnc/SSi dividers */ + sdelay(1000); + + if(running_in_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, BIT0, CM_IDLEST_CKGEN, LDELAY); /* wait till in bypass */ + sdelay(1000); + /* 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, BIT1, CM_IDLEST_CKGEN, LDELAY); /*wait for dpll lock */ + }else if(running_in_flash()){ + /* 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); + } + + __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); +} + +/************************************************************************** + * make_cs1_contiguous() - for es2 and above remap cs1 behind cs0 to allow + * command line mem=xyz use all memory with out discontigious support + * compiled in. Could do it at the ATAG, but there really is two banks... + * Called as part of 2nd phase DDR init. + **************************************************************************/ +void make_cs1_contiguous(void) +{ + u32 size, a_add_low, a_add_high; + + size = get_sdr_cs_size(SDRC_CS0_OSET); + size /= SZ_32M; /* find size to offset CS1 */ + a_add_high = (size & 3) << 8; /* set up low field */ + a_add_low = (size & 0x3C) >> 2; /* set up high field */ + __raw_writel((a_add_high|a_add_low),SDRC_CS_CFG); + +} + +/******************************************************** + * 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 val1, val2; + u32 pattern = 0x12345678; + + __raw_writel(0x0,OMAP2420_SDRC_CS0+0x400); /* clear pos A */ + __raw_writel(pattern, OMAP2420_SDRC_CS0); /* pattern to pos B */ + __raw_writel(0x0,OMAP2420_SDRC_CS0+4); /* remove pattern off the bus */ + val1 = __raw_readl(OMAP2420_SDRC_CS0+0x400); /* get pos A value */ + val2 = __raw_readl(OMAP2420_SDRC_CS0); /* get val2 */ + + if ((val1 != 0) || (val2 != pattern)) /* 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 + * + * This is a bit ugly, but should handle all memory moduels + * used with the H4. The first time though this code from s_init() + * we configure the first chip select. Later on we come back and + * will configure the 2nd chip select if it exists. + * + **************************************************************************/ +void do_sdrc_init(u32 offset, u32 early) +{ + u32 cpu, dllen=0, rev, common=0, cs0=0, pmask=0, pass_type, mtype; + sdrc_data_t *sdata; /* do not change type */ + u32 a, b, r; + + static const sdrc_data_t sdrc_2422 = + { + H4_2422_SDRC_SHARING, H4_2422_SDRC_MDCFG_0_DDR, 0 , H4_2422_SDRC_ACTIM_CTRLA_0, + H4_2422_SDRC_ACTIM_CTRLB_0, H4_2422_SDRC_RFR_CTRL, H4_2422_SDRC_MR_0_DDR, + 0, H4_2422_SDRC_DLLAB_CTRL + }; + static const sdrc_data_t sdrc_2420 = + { + H4_2420_SDRC_SHARING, H4_2420_SDRC_MDCFG_0_DDR, H4_2420_SDRC_MDCFG_0_SDR, + H4_2420_SDRC_ACTIM_CTRLA_0, H4_2420_SDRC_ACTIM_CTRLB_0, + H4_2420_SDRC_RFR_CTRL, H4_2420_SDRC_MR_0_DDR, H4_2420_SDRC_MR_0_SDR, + H4_2420_SDRC_DLLAB_CTRL + }; + + if (offset == SDRC_CS0_OSET) + cs0 = common = 1; /* int regs shared between both chip select */ + + cpu = get_cpu_type(); + rev = get_cpu_rev(); + + /* 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_data_t *)&sdrc_2422; + pass_type = STACKED; + } else{ + sdata = (sdrc_data_t *)&sdrc_2420; + pass_type = IP_DDR; + } + + __asm__ __volatile__("": : :"memory"); /* limit compiler scope */ + + /* u-boot is compiled to run in DDR or SRAM at 8xxxxxxx or 4xxxxxxx. + * If we are running in flash prior to relocation and 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) && running_in_flash()){ + sdata = (sdrc_data_t *)(((u32)sdata & 0x0003FFFF) | get_gpmc0_base()); + /* NOR internal boot offset is 0x4000 from xloader signature */ + if(running_from_internal_boot()) + sdata = (sdrc_data_t *)((u32)sdata + 0x4000); + } + + if (!early && (((mtype = get_mem_type()) == DDR_COMBO)||(mtype == DDR_STACKED))) { + if(mtype == DDR_COMBO){ + pmask = BIT2;/* combo part has a shared CKE signal, can't use feature */ + pass_type = COMBO_DDR; /* CS1 config */ + __raw_writel((__raw_readl(SDRC_POWER)) & ~pmask, SDRC_POWER); + } + if(rev != CPU_2420_2422_ES1) /* for es2 and above smooth things out */ + make_cs1_contiguous(); + } + +next_mem_type: + if (common) { /* do a SDRC reset between types to clear regs*/ + __raw_writel(SOFTRESET, SDRC_SYSCONFIG); /* reset sdrc */ + wait_on_value(BIT0, BIT0, SDRC_STATUS, 12000000);/* wait till reset done set */ + __raw_writel(0, SDRC_SYSCONFIG); /* clear soft reset */ + __raw_writel(sdata->sdrc_sharing, SDRC_SHARING); +#ifdef POWER_SAVE + __raw_writel(__raw_readl(SMS_SYSCONFIG)|SMART_IDLE, SMS_SYSCONFIG); + __raw_writel(sdata->sdrc_sharing|SMART_IDLE, SDRC_SHARING); + __raw_writel((__raw_readl(SDRC_POWER)|BIT6), SDRC_POWER); +#endif + } + + if ((pass_type == IP_DDR) || (pass_type == STACKED)) /* (IP ddr-CS0),(2422-CS0/CS1) */ + __raw_writel(sdata->sdrc_mdcfg_0_ddr, SDRC_MCFG_0+offset); + else if (pass_type == COMBO_DDR){ /* (combo-CS0/CS1) */ + __raw_writel(H4_2420_COMBO_MDCFG_0_DDR,SDRC_MCFG_0+offset); + } else if (pass_type == IP_SDR){ /* ip sdr-CS0 */ + __raw_writel(sdata->sdrc_mdcfg_0_sdr, SDRC_MCFG_0+offset); + } + + a = sdata->sdrc_actim_ctrla_0; + b = sdata->sdrc_actim_ctrlb_0; + r = sdata->sdrc_dllab_ctrl; + + /* work around ES1 DDR issues */ + if((pass_type != IP_SDR) && (rev == CPU_2420_2422_ES1)){ + a = H4_242x_SDRC_ACTIM_CTRLA_0_ES1; + b = H4_242x_SDRC_ACTIM_CTRLB_0_ES1; + r = H4_242x_SDRC_RFR_CTRL_ES1; + } + + if (cs0) { + __raw_writel(a, SDRC_ACTIM_CTRLA_0); + __raw_writel(b, SDRC_ACTIM_CTRLB_0); + } else { + __raw_writel(a, SDRC_ACTIM_CTRLA_1); + __raw_writel(b, SDRC_ACTIM_CTRLB_1); + } + __raw_writel(r, SDRC_RFR_CTRL+offset); + + /* init sequence for mDDR/mSDR 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/msdr */ + __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) (2-SDR) + * Serial mode + * CAS latency = x + */ + if(pass_type == IP_SDR) + __raw_writel(sdata->sdrc_mr_0_sdr, SDRC_MR_0+offset); + else + __raw_writel(sdata->sdrc_mr_0_ddr, SDRC_MR_0+offset); + + /* NOTE: ES1 242x _BUG_ DLL + External Bandwidth fix*/ + if (rev == CPU_2420_2422_ES1){ + dllen = (BIT0|BIT3); /* es1 clear both bit0 and bit3 */ + __raw_writel((__raw_readl(SMS_CLASS_ARB0)|BURSTCOMPLETE_GROUP7) + ,SMS_CLASS_ARB0);/* enable bust complete for lcd */ + } + else + dllen = BIT0|BIT1; /* es2, clear bit0, and 1 (set phase to 72) */ + + /* enable & load up DLL with good value for 75MHz, and set phase to 90 + * ES1 recommends 90 phase, ES2 recommends 72 phase. + */ + if (common && (pass_type != IP_SDR)) { + __raw_writel(sdata->sdrc_dllab_ctrl, SDRC_DLLA_CTRL); + __raw_writel(sdata->sdrc_dllab_ctrl & ~(BIT2|dllen), SDRC_DLLA_CTRL); + __raw_writel(sdata->sdrc_dllab_ctrl, SDRC_DLLB_CTRL); + __raw_writel(sdata->sdrc_dllab_ctrl & ~(BIT2|dllen) , SDRC_DLLB_CTRL); + } + sdelay(90000); + + if(mem_ok()) + return; /* STACKED, other configued type */ + ++pass_type; /* IPDDR->COMBODDR->IPSDR for CS0 */ + goto next_mem_type; +} + +/***************************************************** + * 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, rev, tval; + + rev = get_cpu_rev(); + if (rev == CPU_2420_2422_ES1) + tval = 1; + else + tval = 0; /* disable bit switched meaning */ + + /* global settings */ + __raw_writel(0x10, GPMC_SYSCONFIG); /* smart idle */ + __raw_writel(0x0, GPMC_IRQENABLE); /* isr's sources masked */ + __raw_writel(tval, GPMC_TIMEOUT_CONTROL);/* timeout disable */ +#ifdef CONFIG_SYS_NAND_BOOT + __raw_writel(0x001, GPMC_CONFIG); /* set nWP, disable limited addr */ +#else + __raw_writel(0x111, GPMC_CONFIG); /* set nWP, disable limited addr */ +#endif + + /* 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); + +#ifdef CONFIG_SYS_NAND_BOOT + __raw_writel(H4_24XX_GPMC_CONFIG1_0|mtype|mwidth, GPMC_CONFIG1_0); +#else + __raw_writel(H4_24XX_GPMC_CONFIG1_0|mux|mtype|mwidth, GPMC_CONFIG1_0); +#endif + +#ifdef PRCM_CONFIG_III + __raw_writel(H4_24XX_GPMC_CONFIG2_0, GPMC_CONFIG2_0); +#endif + __raw_writel(H4_24XX_GPMC_CONFIG3_0, GPMC_CONFIG3_0); + __raw_writel(H4_24XX_GPMC_CONFIG4_0, GPMC_CONFIG4_0); +#ifdef PRCM_CONFIG_III + __raw_writel(H4_24XX_GPMC_CONFIG5_0, GPMC_CONFIG5_0); + __raw_writel(H4_24XX_GPMC_CONFIG6_0, GPMC_CONFIG6_0); +#endif + __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); +} |