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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2010 Extreme Engineering Solutions, Inc.
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* Copyright 2007-2008 Freescale Semiconductor, Inc.
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*/
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#include <common.h>
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#include <i2c.h>
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#include <fsl_ddr_sdram.h>
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#include <fsl_ddr_dimm_params.h>
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void get_spd(ddr3_spd_eeprom_t *spd, u8 i2c_address)
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{
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i2c_read(i2c_address, SPD_EEPROM_OFFSET, 2, (uchar *)spd,
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sizeof(ddr3_spd_eeprom_t));
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}
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/*
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* There are traditionally three board-specific SDRAM timing parameters
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* which must be calculated based on the particular PCB artwork. These are:
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* 1.) CPO (Read Capture Delay)
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* - TIMING_CFG_2 register
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* Source: Calculation based on board trace lengths and
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* chip-specific internal delays.
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* 2.) CLK_ADJUST (Clock and Addr/Cmd alignment control)
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* - DDR_SDRAM_CLK_CNTL register
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* Source: Signal Integrity Simulations
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* 3.) 2T Timing on Addr/Ctl
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* - TIMING_CFG_2 register
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* Source: Signal Integrity Simulations
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* Usually only needed with heavy load/very high speed (>DDR2-800)
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*
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* ====== XPedite550x DDR3-800 read delay calculations ======
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*
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* The P2020 processor provides an autoleveling option. Setting CPO to
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* 0x1f enables this auto configuration.
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*/
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typedef struct {
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unsigned short datarate_mhz_low;
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unsigned short datarate_mhz_high;
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unsigned char clk_adjust;
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unsigned char cpo;
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} board_specific_parameters_t;
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const board_specific_parameters_t board_specific_parameters[][20] = {
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{
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/* Controller 0 */
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{
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/* DDR3-600/667 */
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.datarate_mhz_low = 500,
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.datarate_mhz_high = 750,
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.clk_adjust = 5,
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.cpo = 31,
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},
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{
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/* DDR3-800 */
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.datarate_mhz_low = 750,
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.datarate_mhz_high = 850,
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.clk_adjust = 5,
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.cpo = 31,
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},
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},
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};
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void fsl_ddr_board_options(memctl_options_t *popts,
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dimm_params_t *pdimm,
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unsigned int ctrl_num)
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{
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const board_specific_parameters_t *pbsp =
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&(board_specific_parameters[ctrl_num][0]);
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u32 num_params = sizeof(board_specific_parameters[ctrl_num]) /
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sizeof(board_specific_parameters[0][0]);
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u32 i;
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ulong ddr_freq;
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/*
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* Set odt_rd_cfg and odt_wr_cfg. If the there is only one dimm in
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* that controller, set odt_wr_cfg to 4 for CS0, and 0 to CS1. If
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* there are two dimms in the controller, set odt_rd_cfg to 3 and
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* odt_wr_cfg to 3 for the even CS, 0 for the odd CS.
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*/
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for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
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if (i&1) { /* odd CS */
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popts->cs_local_opts[i].odt_rd_cfg = 0;
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popts->cs_local_opts[i].odt_wr_cfg = 0;
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} else { /* even CS */
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if (CONFIG_DIMM_SLOTS_PER_CTLR == 1) {
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popts->cs_local_opts[i].odt_rd_cfg = 0;
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popts->cs_local_opts[i].odt_wr_cfg = 4;
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} else if (CONFIG_DIMM_SLOTS_PER_CTLR == 2) {
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popts->cs_local_opts[i].odt_rd_cfg = 3;
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popts->cs_local_opts[i].odt_wr_cfg = 3;
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}
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}
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}
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/*
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* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
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* freqency and n_banks specified in board_specific_parameters table.
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*/
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ddr_freq = get_ddr_freq(0) / 1000000;
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for (i = 0; i < num_params; i++) {
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if (ddr_freq >= pbsp->datarate_mhz_low &&
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ddr_freq <= pbsp->datarate_mhz_high) {
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popts->clk_adjust = pbsp->clk_adjust;
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popts->cpo_override = pbsp->cpo;
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popts->twot_en = 0;
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break;
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}
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pbsp++;
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}
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if (i == num_params) {
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printf("Warning: board specific timing not found "
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"for data rate %lu MT/s!\n", ddr_freq);
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}
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/*
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* Factors to consider for half-strength driver enable:
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* - number of DIMMs installed
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*/
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popts->half_strength_driver_enable = 0;
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/*
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* Enable on-die termination.
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* From the Micron Technical Node TN-41-04, RTT_Nom should typically
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* be 30 to 40 ohms, while RTT_WR should be 120 ohms. Setting RTT_WR
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* is handled in the Freescale DDR3 driver. Set RTT_Nom here.
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*/
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popts->rtt_override = 1;
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popts->rtt_override_value = 3;
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}
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