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5cb27c5d44
Reading DDR register should use ddr_in32() for proper endianess. This patch fixes incorrect waiting time for ARM platforms. Signed-off-by: York Sun <yorksun@freescale.com>
214 lines
6.9 KiB
C
214 lines
6.9 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_cfg_2, regs->ddr_sdram_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->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->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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ddr_out32(&ddr->ddr_cdr2, regs->ddr_cdr2);
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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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/* Let the controller go */
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temp_sdram_cfg = ddr_in32(&ddr->sdram_cfg) & ~SDRAM_CFG_BI;
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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(0) >> 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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}
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