/* * (C) Copyright 2004 * Texas Instruments, * Richard Woodruff * * 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 #include #include #include #include #include #include #include #include /************************************************************ * 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); }