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https://github.com/AsahiLinux/u-boot
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03e664d8f4
Controller number is passed for function calls to support individual DDR clock, depending on SoC implementation. It is backward compatible with exising platforms. Multiple clocks have been verifyed on LS2085A emulator. Signed-off-by: York Sun <yorksun@freescale.com>
247 lines
7.9 KiB
C
247 lines
7.9 KiB
C
/*
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* Copyright 2013 Freescale Semiconductor, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* Derived from mpc85xx_ddr_gen3.c, removed all workarounds
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <fsl_ddr_sdram.h>
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#include <asm/processor.h>
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#include <fsl_immap.h>
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#include <fsl_ddr.h>
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#if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
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#error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
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#endif
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/*
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* regs has the to-be-set values for DDR controller registers
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* ctrl_num is the DDR controller number
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* step: 0 goes through the initialization in one pass
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* 1 sets registers and returns before enabling controller
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* 2 resumes from step 1 and continues to initialize
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* Dividing the initialization to two steps to deassert DDR reset signal
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* to comply with JEDEC specs for RDIMMs.
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*/
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void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
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unsigned int ctrl_num, int step)
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{
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unsigned int i, bus_width;
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struct ccsr_ddr __iomem *ddr;
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u32 temp_sdram_cfg;
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u32 total_gb_size_per_controller;
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int timeout;
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switch (ctrl_num) {
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case 0:
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ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
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break;
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#if defined(CONFIG_SYS_FSL_DDR2_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 1)
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case 1:
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ddr = (void *)CONFIG_SYS_FSL_DDR2_ADDR;
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break;
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#endif
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#if defined(CONFIG_SYS_FSL_DDR3_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 2)
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case 2:
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ddr = (void *)CONFIG_SYS_FSL_DDR3_ADDR;
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break;
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#endif
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#if defined(CONFIG_SYS_FSL_DDR4_ADDR) && (CONFIG_NUM_DDR_CONTROLLERS > 3)
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case 3:
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ddr = (void *)CONFIG_SYS_FSL_DDR4_ADDR;
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break;
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#endif
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default:
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printf("%s unexpected ctrl_num = %u\n", __func__, ctrl_num);
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return;
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}
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if (step == 2)
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goto step2;
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if (regs->ddr_eor)
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ddr_out32(&ddr->eor, regs->ddr_eor);
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for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
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if (i == 0) {
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ddr_out32(&ddr->cs0_bnds, regs->cs[i].bnds);
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ddr_out32(&ddr->cs0_config, regs->cs[i].config);
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ddr_out32(&ddr->cs0_config_2, regs->cs[i].config_2);
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} else if (i == 1) {
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ddr_out32(&ddr->cs1_bnds, regs->cs[i].bnds);
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ddr_out32(&ddr->cs1_config, regs->cs[i].config);
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ddr_out32(&ddr->cs1_config_2, regs->cs[i].config_2);
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} else if (i == 2) {
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ddr_out32(&ddr->cs2_bnds, regs->cs[i].bnds);
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ddr_out32(&ddr->cs2_config, regs->cs[i].config);
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ddr_out32(&ddr->cs2_config_2, regs->cs[i].config_2);
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} else if (i == 3) {
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ddr_out32(&ddr->cs3_bnds, regs->cs[i].bnds);
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ddr_out32(&ddr->cs3_config, regs->cs[i].config);
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ddr_out32(&ddr->cs3_config_2, regs->cs[i].config_2);
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}
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}
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ddr_out32(&ddr->timing_cfg_3, regs->timing_cfg_3);
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ddr_out32(&ddr->timing_cfg_0, regs->timing_cfg_0);
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ddr_out32(&ddr->timing_cfg_1, regs->timing_cfg_1);
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ddr_out32(&ddr->timing_cfg_2, regs->timing_cfg_2);
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ddr_out32(&ddr->sdram_mode, regs->ddr_sdram_mode);
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ddr_out32(&ddr->sdram_mode_2, regs->ddr_sdram_mode_2);
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ddr_out32(&ddr->sdram_mode_3, regs->ddr_sdram_mode_3);
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ddr_out32(&ddr->sdram_mode_4, regs->ddr_sdram_mode_4);
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ddr_out32(&ddr->sdram_mode_5, regs->ddr_sdram_mode_5);
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ddr_out32(&ddr->sdram_mode_6, regs->ddr_sdram_mode_6);
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ddr_out32(&ddr->sdram_mode_7, regs->ddr_sdram_mode_7);
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ddr_out32(&ddr->sdram_mode_8, regs->ddr_sdram_mode_8);
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ddr_out32(&ddr->sdram_md_cntl, regs->ddr_sdram_md_cntl);
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ddr_out32(&ddr->sdram_interval, regs->ddr_sdram_interval);
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ddr_out32(&ddr->sdram_data_init, regs->ddr_data_init);
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ddr_out32(&ddr->sdram_clk_cntl, regs->ddr_sdram_clk_cntl);
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ddr_out32(&ddr->timing_cfg_4, regs->timing_cfg_4);
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ddr_out32(&ddr->timing_cfg_5, regs->timing_cfg_5);
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ddr_out32(&ddr->ddr_zq_cntl, regs->ddr_zq_cntl);
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ddr_out32(&ddr->ddr_wrlvl_cntl, regs->ddr_wrlvl_cntl);
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#ifndef CONFIG_SYS_FSL_DDR_EMU
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/*
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* Skip these two registers if running on emulator
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* because emulator doesn't have skew between bytes.
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*/
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if (regs->ddr_wrlvl_cntl_2)
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ddr_out32(&ddr->ddr_wrlvl_cntl_2, regs->ddr_wrlvl_cntl_2);
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if (regs->ddr_wrlvl_cntl_3)
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ddr_out32(&ddr->ddr_wrlvl_cntl_3, regs->ddr_wrlvl_cntl_3);
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#endif
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ddr_out32(&ddr->ddr_sr_cntr, regs->ddr_sr_cntr);
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ddr_out32(&ddr->ddr_sdram_rcw_1, regs->ddr_sdram_rcw_1);
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ddr_out32(&ddr->ddr_sdram_rcw_2, regs->ddr_sdram_rcw_2);
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ddr_out32(&ddr->ddr_cdr1, regs->ddr_cdr1);
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#ifdef CONFIG_DEEP_SLEEP
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if (is_warm_boot()) {
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ddr_out32(&ddr->sdram_cfg_2,
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regs->ddr_sdram_cfg_2 & ~SDRAM_CFG2_D_INIT);
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ddr_out32(&ddr->init_addr, CONFIG_SYS_SDRAM_BASE);
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ddr_out32(&ddr->init_ext_addr, DDR_INIT_ADDR_EXT_UIA);
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/* DRAM VRef will not be trained */
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ddr_out32(&ddr->ddr_cdr2,
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regs->ddr_cdr2 & ~DDR_CDR2_VREF_TRAIN_EN);
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} else
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#endif
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{
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ddr_out32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
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ddr_out32(&ddr->init_addr, regs->ddr_init_addr);
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ddr_out32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
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ddr_out32(&ddr->ddr_cdr2, regs->ddr_cdr2);
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}
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ddr_out32(&ddr->err_disable, regs->err_disable);
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ddr_out32(&ddr->err_int_en, regs->err_int_en);
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for (i = 0; i < 32; i++) {
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if (regs->debug[i]) {
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debug("Write to debug_%d as %08x\n", i + 1,
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regs->debug[i]);
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ddr_out32(&ddr->debug[i], regs->debug[i]);
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}
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}
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/*
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* For RDIMMs, JEDEC spec requires clocks to be stable before reset is
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* deasserted. Clocks start when any chip select is enabled and clock
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* control register is set. Because all DDR components are connected to
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* one reset signal, this needs to be done in two steps. Step 1 is to
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* get the clocks started. Step 2 resumes after reset signal is
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* deasserted.
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*/
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if (step == 1) {
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udelay(200);
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return;
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}
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step2:
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/* Set, but do not enable the memory */
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temp_sdram_cfg = regs->ddr_sdram_cfg;
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temp_sdram_cfg &= ~(SDRAM_CFG_MEM_EN);
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ddr_out32(&ddr->sdram_cfg, temp_sdram_cfg);
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/*
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* 500 painful micro-seconds must elapse between
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* the DDR clock setup and the DDR config enable.
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* DDR2 need 200 us, and DDR3 need 500 us from spec,
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* we choose the max, that is 500 us for all of case.
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*/
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udelay(500);
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asm volatile("dsb sy;isb");
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#ifdef CONFIG_DEEP_SLEEP
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if (is_warm_boot()) {
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/* enter self-refresh */
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temp_sdram_cfg = ddr_in32(&ddr->sdram_cfg_2);
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temp_sdram_cfg |= SDRAM_CFG2_FRC_SR;
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ddr_out32(&ddr->sdram_cfg_2, temp_sdram_cfg);
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/* do board specific memory setup */
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board_mem_sleep_setup();
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temp_sdram_cfg = (ddr_in32(&ddr->sdram_cfg) | SDRAM_CFG_BI);
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} else
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#endif
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temp_sdram_cfg = ddr_in32(&ddr->sdram_cfg) & ~SDRAM_CFG_BI;
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/* Let the controller go */
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ddr_out32(&ddr->sdram_cfg, temp_sdram_cfg | SDRAM_CFG_MEM_EN);
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asm volatile("dsb sy;isb");
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total_gb_size_per_controller = 0;
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for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
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if (!(regs->cs[i].config & 0x80000000))
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continue;
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total_gb_size_per_controller += 1 << (
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((regs->cs[i].config >> 14) & 0x3) + 2 +
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((regs->cs[i].config >> 8) & 0x7) + 12 +
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((regs->cs[i].config >> 0) & 0x7) + 8 +
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3 - ((regs->ddr_sdram_cfg >> 19) & 0x3) -
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26); /* minus 26 (count of 64M) */
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}
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if (regs->cs[0].config & 0x20000000) {
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/* 2-way interleaving */
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total_gb_size_per_controller <<= 1;
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}
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/*
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* total memory / bus width = transactions needed
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* transactions needed / data rate = seconds
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* to add plenty of buffer, double the time
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* For example, 2GB on 666MT/s 64-bit bus takes about 402ms
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* Let's wait for 800ms
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*/
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bus_width = 3 - ((ddr_in32(&ddr->sdram_cfg) & SDRAM_CFG_DBW_MASK)
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>> SDRAM_CFG_DBW_SHIFT);
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timeout = ((total_gb_size_per_controller << (6 - bus_width)) * 100 /
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(get_ddr_freq(ctrl_num) >> 20)) << 1;
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total_gb_size_per_controller >>= 4; /* shift down to gb size */
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debug("total %d GB\n", total_gb_size_per_controller);
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debug("Need to wait up to %d * 10ms\n", timeout);
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/* Poll DDR_SDRAM_CFG_2[D_INIT] bit until auto-data init is done. */
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while ((ddr_in32(&ddr->sdram_cfg_2) & SDRAM_CFG2_D_INIT) &&
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(timeout >= 0)) {
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udelay(10000); /* throttle polling rate */
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timeout--;
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}
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if (timeout <= 0)
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printf("Waiting for D_INIT timeout. Memory may not work.\n");
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#ifdef CONFIG_DEEP_SLEEP
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if (is_warm_boot()) {
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/* exit self-refresh */
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temp_sdram_cfg = ddr_in32(&ddr->sdram_cfg_2);
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temp_sdram_cfg &= ~SDRAM_CFG2_FRC_SR;
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ddr_out32(&ddr->sdram_cfg_2, temp_sdram_cfg);
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}
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#endif
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}
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