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https://github.com/brain-hackers/u-boot-brain
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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>
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* EMIF programming
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*
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* (C) Copyright 2010
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* Texas Instruments, <www.ti.com>
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*
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* Aneesh V <aneesh@ti.com>
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*/
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#include <common.h>
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#include <asm/emif.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/utils.h>
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#ifndef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS
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u32 *const T_num = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_NUM;
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u32 *const T_den = (u32 *)OMAP_SRAM_SCRATCH_EMIF_T_DEN;
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#endif
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#ifdef CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
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/* Base AC Timing values specified by JESD209-2 for 400MHz operation */
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static const struct lpddr2_ac_timings timings_jedec_400_mhz = {
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.max_freq = 400000000,
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.RL = 6,
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.tRPab = 21,
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.tRCD = 18,
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.tWR = 15,
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.tRASmin = 42,
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.tRRD = 10,
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.tWTRx2 = 15,
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.tXSR = 140,
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.tXPx2 = 15,
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.tRFCab = 130,
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.tRTPx2 = 15,
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.tCKE = 3,
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.tCKESR = 15,
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.tZQCS = 90,
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.tZQCL = 360,
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.tZQINIT = 1000,
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.tDQSCKMAXx2 = 11,
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.tRASmax = 70,
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.tFAW = 50
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};
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/* Base AC Timing values specified by JESD209-2 for 200 MHz operation */
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static const struct lpddr2_ac_timings timings_jedec_200_mhz = {
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.max_freq = 200000000,
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.RL = 3,
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.tRPab = 21,
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.tRCD = 18,
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.tWR = 15,
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.tRASmin = 42,
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.tRRD = 10,
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.tWTRx2 = 20,
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.tXSR = 140,
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.tXPx2 = 15,
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.tRFCab = 130,
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.tRTPx2 = 15,
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.tCKE = 3,
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.tCKESR = 15,
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.tZQCS = 90,
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.tZQCL = 360,
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.tZQINIT = 1000,
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.tDQSCKMAXx2 = 11,
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.tRASmax = 70,
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.tFAW = 50
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};
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/*
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* Min tCK values specified by JESD209-2
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* Min tCK specifies the minimum duration of some AC timing parameters in terms
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* of the number of cycles. If the calculated number of cycles based on the
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* absolute time value is less than the min tCK value, min tCK value should
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* be used instead. This typically happens at low frequencies.
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*/
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static const struct lpddr2_min_tck min_tck_jedec = {
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.tRL = 3,
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.tRP_AB = 3,
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.tRCD = 3,
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.tWR = 3,
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.tRAS_MIN = 3,
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.tRRD = 2,
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.tWTR = 2,
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.tXP = 2,
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.tRTP = 2,
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.tCKE = 3,
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.tCKESR = 3,
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.tFAW = 8
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};
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static const struct lpddr2_ac_timings *jedec_ac_timings[MAX_NUM_SPEEDBINS] = {
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&timings_jedec_200_mhz,
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&timings_jedec_400_mhz
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};
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const struct lpddr2_device_timings jedec_default_timings = {
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.ac_timings = jedec_ac_timings,
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.min_tck = &min_tck_jedec
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};
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void emif_get_device_timings(u32 emif_nr,
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const struct lpddr2_device_timings **cs0_device_timings,
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const struct lpddr2_device_timings **cs1_device_timings)
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{
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/* Assume Identical devices on EMIF1 & EMIF2 */
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*cs0_device_timings = &jedec_default_timings;
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*cs1_device_timings = &jedec_default_timings;
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}
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#endif /* CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS */
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