Add LPDDR2 support: 1. Implement a function mx6_lpddr2_cfg to initialize MMDC for LPDDR2. 2. Introduce a structure mx6_lpddr2_cfg, most entrys are same to mx6_ddr3_cfg, but still keep it a single one for easy to choose parameters for LPDDR2. 3. If ddr_type is LPDDR2, use mx6_lpddr2_cfg to init MMDC. 4. Update comments.
Signed-off-by: Peng Fan Peng.Fan@freescale.com Cc: Stefano Babic sbabic@denx.de Cc: Tim Harvey tharvey@gateworks.com --- arch/arm/cpu/armv7/mx6/ddr.c | 300 +++++++++++++++++++++++++++++++- arch/arm/include/asm/arch-mx6/mx6-ddr.h | 15 ++ 2 files changed, 311 insertions(+), 4 deletions(-)
diff --git a/arch/arm/cpu/armv7/mx6/ddr.c b/arch/arm/cpu/armv7/mx6/ddr.c index 17909a3..cf5587b 100644 --- a/arch/arm/cpu/armv7/mx6/ddr.c +++ b/arch/arm/cpu/armv7/mx6/ddr.c @@ -7,6 +7,7 @@
#include <common.h> #include <linux/types.h> +#include <asm/arch/clock.h> #include <asm/arch/mx6-ddr.h> #include <asm/arch/sys_proto.h> #include <asm/io.h> @@ -330,15 +331,20 @@ void mx6sdl_dram_iocfg(unsigned width, * Configure mx6 mmdc registers based on: * - board-specific memory configuration * - board-specific calibration data - * - ddr3 chip details + * - ddr3/lpddr2 chip details * * The various calculations here are derived from the Freescale - * i.Mx6DQSDL DDR3 Script Aid spreadsheet (DOC-94917) designed to generate MMDC - * configuration registers based on memory system and memory chip parameters. + * 1. i.Mx6DQSDL DDR3 Script Aid spreadsheet (DOC-94917) designed to generate + * MMDC configuration registers based on memory system and memory chip + * parameters. + * + * 2. i.Mx6SL LPDDR2 Script Aid spreadsheet V0.04 designed to generate MMDC + * configuration registers based on memory system and memory chip + * parameters. * * The defaults here are those which were specified in the spreadsheet. * For details on each register, refer to the IMX6DQRM and/or IMX6SDLRM - * section titled MMDC initialization + * and/or IMX6SLRM section titled MMDC initialization. */ #define MR(val, ba, cmd, cs1) \ ((val << 16) | (1 << 15) | (cmd << 4) | (cs1 << 3) | ba) @@ -348,6 +354,290 @@ void mx6sdl_dram_iocfg(unsigned width, mmdc1->entry = value; \ } while (0)
+/* + * According JESD209-2B-LPDDR2: Table 103 + * WL: write latency + */ +static int lpddr2_wl(uint32_t mem_speed) +{ + switch (mem_speed) { + case 1066: + case 933: + return 4; + case 800: + return 3; + case 677: + case 533: + return 2; + case 400: + case 333: + return 1; + default: + puts("invalid memory speed\n"); + hang(); + } + + return 0; +} + +/* + * According JESD209-2B-LPDDR2: Table 103 + * RL: read latency + */ +static int lpddr2_rl(uint32_t mem_speed) +{ + switch (mem_speed) { + case 1066: + return 8; + case 933: + return 7; + case 800: + return 6; + case 677: + return 5; + case 533: + return 4; + case 400: + case 333: + return 3; + default: + puts("invalid memory speed\n"); + hang(); + } + + return 0; +} + +void mx6_lpddr2_cfg(const struct mx6_ddr_sysinfo *sysinfo, + const struct mx6_mmdc_calibration *calib, + const struct mx6_lpddr2_cfg *lpddr2_cfg) +{ + volatile struct mmdc_p_regs *mmdc0; + u32 val; + u8 tcke, tcksrx, tcksre, trrd; + u8 twl, txp, tfaw, tcl; + u16 tras, twr, tmrd, trtp, twtr, trfc, txsr; + u16 trcd_lp, trppb_lp, trpab_lp, trc_lp; + u16 cs0_end; + u8 coladdr; + int clkper; /* clock period in picoseconds */ + int clock; /* clock freq in mHz */ + int cs; + + /* only support 16/32 bits */ + if (sysinfo->dsize > 1) + hang(); + + mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR; + + clock = mxc_get_clock(MXC_DDR_CLK) / 1000000U; + clkper = (1000 * 1000) / clock; /* pico seconds */ + + twl = lpddr2_wl(lpddr2_cfg->mem_speed) - 1; + + /* LPDDR2-S2 and LPDDR2-S4 have the same tRFC value. */ + switch (lpddr2_cfg->density) { + case 1: + case 2: + case 4: + trfc = DIV_ROUND_UP(130000, clkper) - 1; + txsr = DIV_ROUND_UP(140000, clkper) - 1; + break; + case 8: + trfc = DIV_ROUND_UP(210000, clkper) - 1; + txsr = DIV_ROUND_UP(220000, clkper) - 1; + break; + default: + /* + * 64Mb, 128Mb, 256Mb, 512Mb are not supported currently. + */ + hang(); + break; + } + /* + * txpdll, txpr, taonpd and taofpd are not relevant in LPDDR2 mode, + * set them to 0. */ + txp = DIV_ROUND_UP(7500, clkper) - 1; + tcke = 3; + if (lpddr2_cfg->mem_speed == 333) + tfaw = DIV_ROUND_UP(60000, clkper) - 1; + else + tfaw = DIV_ROUND_UP(50000, clkper) - 1; + trrd = DIV_ROUND_UP(10000, clkper) - 1; + + /* tckesr for LPDDR2 */ + tcksre = DIV_ROUND_UP(15000, clkper); + tcksrx = tcksre; + twr = DIV_ROUND_UP(15000, clkper) - 1; + /* + * tMRR: 2, tMRW: 5 + * tMRD should be set to max(tMRR, tMRW) + */ + tmrd = 5; + tras = DIV_ROUND_UP(lpddr2_cfg->trasmin, clkper / 10) - 1; + /* LPDDR2 mode use tRCD_LP filed in MDCFG3. */ + trcd_lp = DIV_ROUND_UP(lpddr2_cfg->trcd_lp, clkper / 10) - 1; + trc_lp = DIV_ROUND_UP(lpddr2_cfg->trasmin + lpddr2_cfg->trppb_lp, + clkper / 10) - 1; + trppb_lp = DIV_ROUND_UP(lpddr2_cfg->trppb_lp, clkper / 10) - 1; + trpab_lp = DIV_ROUND_UP(lpddr2_cfg->trpab_lp, clkper / 10) - 1; + /* To LPDDR2, CL in MDCFG0 refers to RL */ + tcl = lpddr2_rl(lpddr2_cfg->mem_speed) - 3; + twtr = DIV_ROUND_UP(7500, clkper) - 1; + trtp = DIV_ROUND_UP(7500, clkper) - 1; + + cs0_end = 4 * sysinfo->cs_density - 1; + + debug("density:%d Gb (%d Gb per chip)\n", + sysinfo->cs_density, lpddr2_cfg->density); + debug("clock: %dMHz (%d ps)\n", clock, clkper); + debug("memspd:%d\n", lpddr2_cfg->mem_speed); + debug("trcd_lp=%d\n", trcd_lp); + debug("trppb_lp=%d\n", trppb_lp); + debug("trpab_lp=%d\n", trpab_lp); + debug("trc_lp=%d\n", trc_lp); + debug("tcke=%d\n", tcke); + debug("tcksrx=%d\n", tcksrx); + debug("tcksre=%d\n", tcksre); + debug("trfc=%d\n", trfc); + debug("txsr=%d\n", txsr); + debug("txp=%d\n", txp); + debug("tfaw=%d\n", tfaw); + debug("tcl=%d\n", tcl); + debug("tras=%d\n", tras); + debug("twr=%d\n", twr); + debug("tmrd=%d\n", tmrd); + debug("twl=%d\n", twl); + debug("trtp=%d\n", trtp); + debug("twtr=%d\n", twtr); + debug("trrd=%d\n", trrd); + debug("cs0_end=%d\n", cs0_end); + debug("ncs=%d\n", sysinfo->ncs); + + /* + * board-specific configuration: + * These values are determined empirically and vary per board layout + */ + mmdc0->mpwldectrl0 = calib->p0_mpwldectrl0; + mmdc0->mpwldectrl1 = calib->p0_mpwldectrl1; + mmdc0->mpdgctrl0 = calib->p0_mpdgctrl0; + mmdc0->mpdgctrl1 = calib->p0_mpdgctrl1; + mmdc0->mprddlctl = calib->p0_mprddlctl; + mmdc0->mpwrdlctl = calib->p0_mpwrdlctl; + mmdc0->mpzqlp2ctl = calib->mpzqlp2ctl; + + /* Read data DQ Byte0-3 delay */ + mmdc0->mprddqby0dl = 0x33333333; + mmdc0->mprddqby1dl = 0x33333333; + if (sysinfo->dsize > 0) { + mmdc0->mprddqby2dl = 0x33333333; + mmdc0->mprddqby3dl = 0x33333333; + } + + /* Write data DQ Byte0-3 delay */ + mmdc0->mpwrdqby0dl = 0xf3333333; + mmdc0->mpwrdqby1dl = 0xf3333333; + if (sysinfo->dsize > 0) { + mmdc0->mpwrdqby2dl = 0xf3333333; + mmdc0->mpwrdqby3dl = 0xf3333333; + } + + /* + * In LPDDR2 mode this register should be cleared, + * so no termination will be activated. + */ + mmdc0->mpodtctrl = 0; + + /* complete calibration */ + val = (1 << 11); /* Force measurement on delay-lines */ + mmdc0->mpmur0 = val; + + /* Step 1: configuration request */ + mmdc0->mdscr = (u32)(1 << 15); /* config request */ + + /* Step 2: Timing configuration */ + mmdc0->mdcfg0 = (trfc << 24) | (txsr << 16) | (txp << 13) | + (tfaw << 4) | tcl; + mmdc0->mdcfg1 = (tras << 16) | (twr << 9) | (tmrd << 5) | twl; + mmdc0->mdcfg2 = (trtp << 6) | (twtr << 3) | trrd; + mmdc0->mdcfg3lp = (trc_lp << 16) | (trcd_lp << 8) | + (trppb_lp << 4) | trpab_lp; + mmdc0->mdotc = 0; + + mmdc0->mdasp = cs0_end; /* CS addressing */ + + /* Step 3: Configure DDR type */ + mmdc0->mdmisc = (sysinfo->cs1_mirror << 19) | (sysinfo->walat << 16) | + (sysinfo->bi_on << 12) | (sysinfo->mif3_mode << 9) | + (sysinfo->ralat << 6) | (1 << 3); + + /* Step 4: Configure delay while leaving reset */ + mmdc0->mdor = (sysinfo->sde_to_rst << 8) | + (sysinfo->rst_to_cke << 0); + + /* Step 5: Configure DDR physical parameters (density and burst len) */ + coladdr = lpddr2_cfg->coladdr; + if (lpddr2_cfg->coladdr == 8) /* 8-bit COL is 0x3 */ + coladdr += 4; + else if (lpddr2_cfg->coladdr == 12) /* 12-bit COL is 0x4 */ + coladdr += 1; + mmdc0->mdctl = (lpddr2_cfg->rowaddr - 11) << 24 | /* ROW */ + (coladdr - 9) << 20 | /* COL */ + (0 << 19) | /* Burst Length = 4 for LPDDR2 */ + (sysinfo->dsize << 16); /* DDR data bus size */ + + /* Step 6: Perform ZQ calibration */ + val = 0xa1390003; /* one-time HW ZQ calib */ + mmdc0->mpzqhwctrl = val; + + /* Step 7: Enable MMDC with desired chip select */ + mmdc0->mdctl |= (1 << 31) | /* SDE_0 for CS0 */ + ((sysinfo->ncs == 2) ? 1 : 0) << 30; /* SDE_1 for CS1 */ + + /* Step 8: Write Mode Registers to Init LPDDR2 devices */ + for (cs = 0; cs < sysinfo->ncs; cs++) { + /* MR63: reset */ + mmdc0->mdscr = MR(63, 0, 3, cs); + /* MR10: calibration, + * 0xff is calibration command after intilization. + */ + val = 0xA | (0xff << 8); + mmdc0->mdscr = MR(val, 0, 3, cs); + /* MR1 */ + val = 0x1 | (0x82 << 8); + mmdc0->mdscr = MR(val, 0, 3, cs); + /* MR2 */ + val = 0x2 | (0x04 << 8); + mmdc0->mdscr = MR(val, 0, 3, cs); + /* MR3 */ + val = 0x3 | (0x02 << 8); + mmdc0->mdscr = MR(val, 0, 3, cs); + } + + /* Step 10: Power down control and self-refresh */ + mmdc0->mdpdc = (tcke & 0x7) << 16 | + 5 << 12 | /* PWDT_1: 256 cycles */ + 5 << 8 | /* PWDT_0: 256 cycles */ + 1 << 6 | /* BOTH_CS_PD */ + (tcksrx & 0x7) << 3 | + (tcksre & 0x7); + mmdc0->mapsr = 0x00001006; /* ADOPT power down enabled */ + + /* Step 11: Configure ZQ calibration: one-time and periodic 1ms */ + val = 0xa1310003; + mmdc0->mpzqhwctrl = val; + + /* Step 12: Configure and activate periodic refresh */ + mmdc0->mdref = (0 << 14) | /* REF_SEL: Periodic refresh cycle: 64kHz */ + (3 << 11); /* REFR: Refresh Rate - 4 refreshes */ + + /* Step 13: Deassert config request - init complete */ + mmdc0->mdscr = 0x00000000; + + /* wait for auto-ZQ calibration to complete */ + mdelay(1); +} + void mx6_ddr3_cfg(const struct mx6_ddr_sysinfo *sysinfo, const struct mx6_mmdc_calibration *calib, const struct mx6_ddr3_cfg *ddr3_cfg) @@ -662,6 +952,8 @@ void mx6_dram_cfg(const struct mx6_ddr_sysinfo *sysinfo, { if (sysinfo->ddr_type == DDR_TYPE_DDR3) { mx6_ddr3_cfg(sysinfo, calib, ddr_cfg); + } else if (sysinfo->ddr_type == DDR_TYPE_LPDDR2) { + mx6_lpddr2_cfg(sysinfo, calib, ddr_cfg); } else { puts("Unsupported ddr type\n"); hang(); diff --git a/arch/arm/include/asm/arch-mx6/mx6-ddr.h b/arch/arm/include/asm/arch-mx6/mx6-ddr.h index 36fcb2b..68d9bda 100644 --- a/arch/arm/include/asm/arch-mx6/mx6-ddr.h +++ b/arch/arm/include/asm/arch-mx6/mx6-ddr.h @@ -377,6 +377,21 @@ struct mx6_ddr3_cfg { u8 SRT; /* self-refresh temperature: 0=normal, 1=extended */ };
+/* Device Information: Varies per LPDDR2 part number and speed grade */ +struct mx6_lpddr2_cfg { + u16 mem_speed; /* ie 800 for LPDDR2-800 */ + u8 density; /* chip density (Gb) (1,2,4,8) */ + u8 width; /* bus width (bits) (4,8,16) */ + u8 banks; /* number of banks */ + u8 rowaddr; /* row address bits (11-16)*/ + u8 coladdr; /* col address bits (9-12) */ + u16 trcd_lp; + u16 trppb_lp; + u16 trpab_lp; + u16 trcmin; /* tRC min (ns*100) */ + u16 trasmin; /* tRAS min (ns*100) */ +}; + /* System Information: Varies per board design, layout, and term choices */ struct mx6_ddr_sysinfo { u8 dsize; /* size of bus (in dwords: 0=16bit,1=32bit,2=64bit) */