[U-Boot] [PATCH v2 05/13] drivers: ddr: Add DDR2 SDRAM controller driver for Microchip PIC32.
Daniel Schwierzeck
daniel.schwierzeck at gmail.com
Tue Jan 5 20:02:09 CET 2016
2016-01-04 15:01 GMT+01:00 Purna Chandra Mandal <purna.mandal at microchip.com>:
> Signed-off-by: Paul Thacker <paul.thacker at microchip.com>
> Signed-off-by: Purna Chandra Mandal <purna.mandal at microchip.com>
>
> ---
>
> Changes in v2:
> - move ddr2 initialization from board/microchip/ to drivers/ddr/microchip
>
> arch/mips/mach-pic32/include/mach/ddr.h | 32 ++++
> drivers/Makefile | 1 +
> drivers/ddr/microchip/Makefile | 6 +
> drivers/ddr/microchip/ddr2.c | 277 ++++++++++++++++++++++++++++++++
> drivers/ddr/microchip/ddr2_regs.h | 151 +++++++++++++++++
> drivers/ddr/microchip/ddr2_timing.h | 65 ++++++++
> 6 files changed, 532 insertions(+)
> create mode 100644 arch/mips/mach-pic32/include/mach/ddr.h
> create mode 100644 drivers/ddr/microchip/Makefile
> create mode 100644 drivers/ddr/microchip/ddr2.c
> create mode 100644 drivers/ddr/microchip/ddr2_regs.h
> create mode 100644 drivers/ddr/microchip/ddr2_timing.h
>
> diff --git a/arch/mips/mach-pic32/include/mach/ddr.h b/arch/mips/mach-pic32/include/mach/ddr.h
> new file mode 100644
> index 0000000..7e0b9d5
> --- /dev/null
> +++ b/arch/mips/mach-pic32/include/mach/ddr.h
> @@ -0,0 +1,32 @@
> +/*
> + * (c) 2015 Purna Chandra Mandal <purna.mandal at microchip.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + *
> + */
> +
> +#ifndef __MICROCHIP_PIC32_DDR_H
> +#define __MICROCHIP_PIC32_DDR_H
> +
> +/* called by initdram() function */
> +void ddr2_phy_init(void);
> +void ddr2_ctrl_init(void);
> +phys_size_t ddr2_calculate_size(void);
> +
> +/* Maximum number of agents */
> +#define NUM_AGENTS 5
> +
> +/* Board can provide agent specific parameters for arbitration by
> + * filling struct ddr2_arbiter_params for all the agents and
> + * implementing board_get_ddr_arbiter_params() to return the filled
> + * structure.
> + */
> +struct ddr2_arbiter_params {
> + u32 min_limit; /* min bursts to execute per arbitration */
> + u32 req_period; /* request period threshold for accepted cmds */
> + u32 min_cmd_acpt; /* min number of accepted cmds */
> +};
> +
> +struct ddr2_arbiter_params *board_get_ddr_arbiter_params(void);
> +
> +#endif /* __MICROCHIP_PIC32_DDR_H */
> diff --git a/drivers/Makefile b/drivers/Makefile
> index c9031f2..0ab54d9 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -68,4 +68,5 @@ obj-y += soc/
> obj-$(CONFIG_REMOTEPROC) += remoteproc/
> obj-y += thermal/
>
> +obj-$(CONFIG_MACH_PIC32) += ddr/microchip/
> endif
> diff --git a/drivers/ddr/microchip/Makefile b/drivers/ddr/microchip/Makefile
> new file mode 100644
> index 0000000..305c48b
> --- /dev/null
> +++ b/drivers/ddr/microchip/Makefile
> @@ -0,0 +1,6 @@
> +#
> +# Copyright (C) 2015 Microchip Technology Inc.
> +#
> +# SPDX-License-Identifier: GPL-2.0+
> +#
> +obj-$(CONFIG_MACH_PIC32) += ddr2.o
> diff --git a/drivers/ddr/microchip/ddr2.c b/drivers/ddr/microchip/ddr2.c
> new file mode 100644
> index 0000000..2ca8eaf
> --- /dev/null
> +++ b/drivers/ddr/microchip/ddr2.c
> @@ -0,0 +1,277 @@
> +/*
> + * (c) 2015 Paul Thacker <paul.thacker at microchip.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + *
> + */
> +#include <asm/io.h>
> +#include <config.h>
> +#include <wait_bit.h>
> +#include <linux/kernel.h>
> +#include <linux/bitops.h>
> +#include <mach/pic32.h>
> +#include <mach/ddr.h>
> +#include "ddr2_regs.h"
> +#include "ddr2_timing.h"
> +
> +/* init DDR2 Phy */
> +void ddr2_phy_init(void)
> +{
> + struct ddr2_phy_regs *ddr2_phy;
> + u32 pad_ctl;
> +
> + ddr2_phy = (struct ddr2_phy_regs *)pic32_ioremap(PIC32_DDR2P_BASE);
an explicit cast from 'void *' is not needed
> +
> + /* PHY_DLL_RECALIB */
> + writel(DELAY_START_VAL(3) | DISABLE_RECALIB(0) |
> + RECALIB_CNT(0x10), &ddr2_phy->dll_recalib);
> +
> + /* PHY_PAD_CTRL */
> + pad_ctl = ODT_SEL | ODT_EN | DRIVE_SEL(0) |
> + ODT_PULLDOWN(2) | ODT_PULLUP(3) |
> + EXTRA_OEN_CLK(0) | NOEXT_DLL |
> + DLR_DFT_WRCMD | HALF_RATE |
> + DRVSTR_PFET(0xe) | DRVSTR_NFET(0xe) |
> + RCVR_EN | PREAMBLE_DLY(2);
> + writel(pad_ctl, &ddr2_phy->pad_ctrl);
> +
> + /* SCL_CONFIG_0 */
> + writel(SCL_BURST8 | SCL_DDR_CONNECTED | SCL_RCAS_LAT(RL) |
> + SCL_ODTCSWW, &ddr2_phy->scl_config_1);
> +
> + /* SCL_CONFIG_1 */
> + writel(SCL_CSEN | SCL_WCAS_LAT(WL), &ddr2_phy->scl_config_2);
> +
> + /* SCL_LAT */
> + writel(SCL_CAPCLKDLY(3) | SCL_DDRCLKDLY(4), &ddr2_phy->scl_latency);
> +}
> +
> +/* start phy self calibration logic */
> +static int ddr2_phy_calib_start(void)
> +{
> + struct ddr2_phy_regs *ddr2_phy;
> +
> + ddr2_phy = (struct ddr2_phy_regs *)pic32_ioremap(PIC32_DDR2P_BASE);
an explicit cast from 'void *' is not needed
> +
> + /* DDR Phy SCL Start */
> + writel(SCL_START | SCL_EN, &ddr2_phy->scl_start);
> +
> + /* Wait for SCL for data byte to pass */
> + return wait_for_bit(__func__, &ddr2_phy->scl_start, SCL_LUBPASS,
> + true, CONFIG_SYS_HZ, false);
> +}
> +
> +/* DDR2 Controller initialization */
> +
> +/* Target Agent Arbiter */
> +static void ddr_set_arbiter(struct ddr2_ctrl_regs *ctrl,
> + struct ddr2_arbiter_params *param)
*param should be const
> +{
> + int i;
> +
> + for (i = 0; i < NUM_AGENTS; i++) {
> + /* set min burst size */
> + writel(i * MIN_LIM_WIDTH, &ctrl->tsel);
> + writel(param->min_limit, &ctrl->minlim);
> +
> + /* set request period (4 * req_period clocks) */
> + writel(i * RQST_PERIOD_WIDTH, &ctrl->tsel);
> + writel(param->req_period, &ctrl->reqprd);
> +
> + /* set number of burst accepted */
> + writel(i * MIN_CMDACPT_WIDTH, &ctrl->tsel);
> + writel(param->min_cmd_acpt, &ctrl->mincmd);
> + }
> +}
> +
> +struct ddr2_arbiter_params *__weak board_get_ddr_arbiter_params(void)
> +{
> + /* default arbiter parameters */
> + static struct ddr2_arbiter_params arb_params[] = {
> + { .min_limit = 0x1f, .req_period = 0xff, .min_cmd_acpt = 0x04,},
> + { .min_limit = 0x1f, .req_period = 0xff, .min_cmd_acpt = 0x10,},
> + { .min_limit = 0x1f, .req_period = 0xff, .min_cmd_acpt = 0x10,},
> + { .min_limit = 0x04, .req_period = 0xff, .min_cmd_acpt = 0x04,},
> + { .min_limit = 0x04, .req_period = 0xff, .min_cmd_acpt = 0x04,},
> + };
is that a constant table? If yes the declaration of the table and the
return value of this function should be annotated with const
> +
> + return (struct ddr2_arbiter_params *)arb_params;
the cast is not needed. To return the address of the first element:
return &arb_params[0];
> +}
> +
> +static void host_load_cmd(struct ddr2_ctrl_regs *ctrl, u32 offset,
> + u32 hostcmd2, u32 hostcmd1, u32 delay)
> +{
> + u32 hc_delay;
> +
> + hc_delay = max_t(u32, DIV_ROUND_UP(delay, tCK), 2) - 2;
> + writel(hostcmd1, &ctrl->cmd10 + offset);
> + writel((hostcmd2 & 0x7ff) | (hc_delay << 11), &ctrl->cmd20 + offset);
> +}
> +
> +/* init DDR2 Controller */
> +void ddr2_ctrl_init(void)
> +{
> + u32 wr2prech, rd2prech, wr2rd, wr2rd_cs;
> + u32 ras2ras, ras2cas, prech2ras, temp;
> + struct ddr2_arbiter_params *arb_params;
as mentioned above, this pointer should be const
> + struct ddr2_ctrl_regs *ctrl;
> +
> + ctrl = (struct ddr2_ctrl_regs *)pic32_ioremap(PIC32_DDR2C_BASE);
an explicit cast from 'void *' is not needed
> +
> + /* PIC32 DDR2 controller always work in HALF_RATE */
> + writel(HALF_RATE_MODE, &ctrl->memwidth);
> +
> + /* Set arbiter configuration per target */
> + arb_params = board_get_ddr_arbiter_params();
> + ddr_set_arbiter(ctrl, arb_params);
> +
> + /* Address Configuration, model {CS, ROW, BA, COL} */
> + writel((ROW_ADDR_RSHIFT | (BA_RSHFT << 8) | (CS_ADDR_RSHIFT << 16) |
> + (COL_HI_RSHFT << 24) | (SB_PRI << 29) |
> + (EN_AUTO_PRECH << 30)), &ctrl->memcfg0);
> +
> + writel(ROW_ADDR_MASK, &ctrl->memcfg1);
> + writel(COL_HI_MASK, &ctrl->memcfg2);
> + writel(COL_LO_MASK, &ctrl->memcfg3);
> + writel(BA_MASK | (CS_ADDR_MASK << 8), &ctrl->memcfg4);
> +
> + /* Refresh Config */
> + writel(REFCNT_CLK(DIV_ROUND_UP(tRFI, tCK_CTRL) - 2) |
> + REFDLY_CLK(DIV_ROUND_UP(tRFC_MIN, tCK_CTRL) - 2) |
> + MAX_PEND_REF(7),
> + &ctrl->refcfg);
> +
> + /* Power Config */
> + writel(ECC_EN(0) | ERR_CORR_EN(0) | EN_AUTO_PWR_DN(0) |
> + EN_AUTO_SELF_REF(3) | PWR_DN_DLY(8) |
> + SELF_REF_DLY(17) | PRECH_PWR_DN_ONLY(0),
> + &ctrl->pwrcfg);
> +
> + /* Delay Config */
> + wr2rd = max_t(u32, DIV_ROUND_UP(tWTR, tCK_CTRL),
> + DIV_ROUND_UP(tWTR_TCK, 2)) + WL + BL;
> + wr2rd_cs = max_t(u32, wr2rd - 1, 3);
> + wr2prech = DIV_ROUND_UP(tWR, tCK_CTRL) + (WL + BL);
> + rd2prech = max_t(u32, DIV_ROUND_UP(tRTP, tCK_CTRL),
> + DIV_ROUND_UP(tRTP_TCK, 2)) + BL - 2;
> + ras2ras = max_t(u32, DIV_ROUND_UP(tRRD, tCK_CTRL),
> + DIV_ROUND_UP(tRRD_TCK, 2)) - 1;
> + ras2cas = DIV_ROUND_UP(tRCD, tCK_CTRL) - 1;
> + prech2ras = DIV_ROUND_UP(tRP, tCK_CTRL) - 1;
> +
> + writel(((wr2rd & 0x0f) |
> + ((wr2rd_cs & 0x0f) << 4) |
> + ((BL - 1) << 8) |
> + (BL << 12) |
> + ((BL - 1) << 16) |
> + ((BL - 1) << 20) |
> + ((BL + 2) << 24) |
> + ((RL - WL + 3) << 28)), &ctrl->dlycfg0);
> +
> + writel(((tCKE_TCK - 1) |
> + (((DIV_ROUND_UP(tDLLK, 2) - 2) & 0xff) << 8) |
> + ((tCKE_TCK - 1) << 16) |
> + ((max_t(u32, tXP_TCK, tCKE_TCK) - 1) << 20) |
> + ((wr2prech >> 4) << 26) |
> + ((wr2rd >> 4) << 27) |
> + ((wr2rd_cs >> 4) << 28) |
> + (((RL + 5) >> 4) << 29) |
> + ((DIV_ROUND_UP(tDLLK, 2) >> 8) << 30)), &ctrl->dlycfg1);
> +
> + writel((DIV_ROUND_UP(tRP, tCK_CTRL) |
> + (rd2prech << 8) |
> + ((wr2prech & 0x0f) << 12) |
> + (ras2ras << 16) |
> + (ras2cas << 20) |
> + (prech2ras << 24) |
> + ((RL + 3) << 28)), &ctrl->dlycfg2);
> +
> + writel(((DIV_ROUND_UP(tRAS_MIN, tCK_CTRL) - 1) |
> + ((DIV_ROUND_UP(tRC, tCK_CTRL) - 1) << 8) |
> + ((DIV_ROUND_UP(tFAW, tCK_CTRL) - 1) << 16)),
> + &ctrl->dlycfg3);
> +
> + /* ODT Config */
> + writel(0x0, &ctrl->odtcfg);
> + writel(BIT(16), &ctrl->odtencfg);
> + writel(ODTRDLY(RL - 3) | ODTWDLY(WL - 3) | ODTRLEN(2) | ODTWLEN(3),
> + &ctrl->odtcfg);
> +
> + /* Transfer Configuration */
> + writel(NXTDATRQDLY(2) | NXDATAVDLY(4) | RDATENDLY(2) |
> + MAX_BURST(3) | (7 << 28) | BIG_ENDIAN(0),
> + &ctrl->xfercfg);
> +
> + /* DRAM Initialization */
> + /* CKE high after reset and wait 400 nsec */
> + host_load_cmd(ctrl, 0, 0, IDLE_NOP, 400000);
> +
> + /* issue precharge all command */
> + host_load_cmd(ctrl, 4, 0x04, PRECH_ALL_CMD, tRP + tCK);
> +
> + /* initialize EMR2 */
> + host_load_cmd(ctrl, 8, 0x200, LOAD_MODE_CMD, tMRD_TCK * tCK);
> +
> + /* initialize EMR3 */
> + host_load_cmd(ctrl, 0xc, 0x300, LOAD_MODE_CMD, tMRD_TCK * tCK);
> +
> + /*
> + * RDQS disable, DQSB enable, OCD exit, 150 ohm termination,
> + * AL=0, DLL enable
> + */
> + host_load_cmd(ctrl, 0x10, 0x100,
> + LOAD_MODE_CMD | (0x40 << 24), tMRD_TCK * tCK);
> + /*
> + * PD fast exit, WR REC = tWR in clocks -1,
> + * DLL reset, CAS = RL, burst = 4
> + */
> + temp = ((DIV_ROUND_UP(tWR, tCK) - 1) << 1) | 1;
> + host_load_cmd(ctrl, 0x14, temp, LOAD_MODE_CMD | (RL << 28) | (2 << 24),
> + tMRD_TCK * tCK);
> +
> + /* issue precharge all command */
> + host_load_cmd(ctrl, 0x18, 4, PRECH_ALL_CMD, tRP + tCK);
> +
> + /* issue refresh command */
> + host_load_cmd(ctrl, 0x1c, 0, REF_CMD, tRFC_MIN);
> +
> + /* issue refresh command */
> + host_load_cmd(ctrl, 0x20, 0, REF_CMD, tRFC_MIN);
> +
> + /* Mode register programming as before without DLL reset */
> + host_load_cmd(ctrl, 0x24, temp, LOAD_MODE_CMD | (RL << 28) | (3 << 24),
> + tMRD_TCK * tCK);
> +
> + /* extended mode register same as before with OCD default */
> + host_load_cmd(ctrl, 0x28, 0x103, LOAD_MODE_CMD | (0xc << 24),
> + tMRD_TCK * tCK);
> +
> + /* extended mode register same as before with OCD exit */
> + host_load_cmd(ctrl, 0x2c, 0x100, LOAD_MODE_CMD | (0x4 << 28),
> + 140 * tCK);
> +
> + writel(CMD_VALID | NUMHOSTCMD(11), &ctrl->cmdissue);
> +
> + /* start memory initialization */
> + writel(INIT_START, &ctrl->memcon);
> +
> + /* wait for all host cmds to be transmitted */
> + wait_for_bit(__func__, &ctrl->cmdissue, CMD_VALID, false,
> + CONFIG_SYS_HZ, false);
> +
> + /* inform all cmds issued, ready for normal operation */
> + writel(INIT_START | INIT_DONE, &ctrl->memcon);
> +
> + /* perform phy caliberation */
> + ddr2_phy_calib_start();
> +}
> +
> +phys_size_t ddr2_calculate_size(void)
> +{
> + u32 temp;
> +
> + temp = 1 << (COL_BITS + BA_BITS + ROW_BITS);
> + /* 16-bit data width between controller and DIMM */
> + temp = temp * CS_BITS * (16 / 8);
> + return (phys_size_t)temp;
> +}
> diff --git a/drivers/ddr/microchip/ddr2_regs.h b/drivers/ddr/microchip/ddr2_regs.h
> new file mode 100644
> index 0000000..3ed58de
> --- /dev/null
> +++ b/drivers/ddr/microchip/ddr2_regs.h
> @@ -0,0 +1,151 @@
> +/*
> + * (c) 2015 Purna Chandra Mandal <purna.mandal at microchip.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + *
> + */
> +
> +#ifndef __MICROCHIP_DDR2_REGS_H
> +#define __MICROCHIP_DDR2_REGS_H
> +
> +#include <config.h>
> +#include <linux/bitops.h>
> +
> +/* DDR2 Controller */
> +struct ddr2_ctrl_regs {
> + u32 tsel;
> + u32 minlim;
> + u32 reqprd;
> + u32 mincmd;
> + u32 memcon;
> + u32 memcfg0;
> + u32 memcfg1;
> + u32 memcfg2;
> + u32 memcfg3;
> + u32 memcfg4;
> + u32 refcfg;
> + u32 pwrcfg;
> + u32 dlycfg0;
> + u32 dlycfg1;
> + u32 dlycfg2;
> + u32 dlycfg3;
> + u32 odtcfg;
> + u32 xfercfg;
> + u32 cmdissue;
> + u32 odtencfg;
> + u32 memwidth;
> + u32 unused[11];
> + u32 cmd10;
> + u32 othercmd10[15];
> + u32 cmd20;
> + u32 othercmd20[15];
> +};
> +
> +/* Arbiter Config */
> +#define MIN_LIM_WIDTH 5
> +#define RQST_PERIOD_WIDTH 8
> +#define MIN_CMDACPT_WIDTH 8
> +
> +/* Refresh Config */
> +#define REFCNT_CLK(x) (x)
> +#define REFDLY_CLK(x) ((x) << 16)
> +#define MAX_PEND_REF(x) ((x) << 24)
> +
> +/* Power Config */
> +#define PRECH_PWR_DN_ONLY(x) ((x) << 22)
> +#define SELF_REF_DLY(x) ((x) << 12)
> +#define PWR_DN_DLY(x) ((x) << 4)
> +#define EN_AUTO_SELF_REF(x) ((x) << 3)
> +#define EN_AUTO_PWR_DN(x) ((x) << 2)
> +#define ERR_CORR_EN(x) ((x) << 1)
> +#define ECC_EN(x) (x)
> +
> +/* Memory Width */
> +#define HALF_RATE_MODE BIT(3)
> +
> +/* Delay Config */
> +#define ODTWLEN(x) ((x) << 20)
> +#define ODTRLEN(x) ((x) << 16)
> +#define ODTWDLY(x) ((x) << 12)
> +#define ODTRDLY(x) ((x) << 8)
> +
> +/* Xfer Config */
> +#define BIG_ENDIAN(x) ((x) << 31)
> +#define MAX_BURST(x) ((x) << 24)
> +#define RDATENDLY(x) ((x) << 16)
> +#define NXDATAVDLY(x) ((x) << 4)
> +#define NXTDATRQDLY(x) ((x) << 0)
> +
> +/* Host Commands */
> +#define IDLE_NOP 0x00ffffff
> +#define PRECH_ALL_CMD 0x00fff401
> +#define REF_CMD 0x00fff801
> +#define LOAD_MODE_CMD 0x00fff001
> +#define CKE_LOW 0x00ffeffe
> +
> +#define NUM_HOST_CMDS 12
> +
> +/* Host CMD Issue */
> +#define CMD_VALID BIT(4)
> +#define NUMHOSTCMD(x) (x)
> +
> +/* Memory Control */
> +#define INIT_DONE BIT(1)
> +#define INIT_START BIT(0)
> +
> +/* Address Control */
> +#define EN_AUTO_PRECH 0
> +#define SB_PRI 1
> +
> +/* DDR2 Phy Register */
> +struct ddr2_phy_regs {
> + u32 scl_start;
> + u32 unused1[2];
> + u32 scl_latency;
> + u32 unused2[2];
> + u32 scl_config_1;
> + u32 scl_config_2;
> + u32 pad_ctrl;
> + u32 dll_recalib;
> +};
> +
> +/* PHY PAD CONTROL */
> +#define ODT_SEL BIT(0)
> +#define ODT_EN BIT(1)
> +#define DRIVE_SEL(x) ((x) << 2)
> +#define ODT_PULLDOWN(x) ((x) << 4)
> +#define ODT_PULLUP(x) ((x) << 6)
> +#define EXTRA_OEN_CLK(x) ((x) << 8)
> +#define NOEXT_DLL BIT(9)
> +#define DLR_DFT_WRCMD BIT(13)
> +#define HALF_RATE BIT(14)
> +#define DRVSTR_PFET(x) ((x) << 16)
> +#define DRVSTR_NFET(x) ((x) << 20)
> +#define RCVR_EN BIT(28)
> +#define PREAMBLE_DLY(x) ((x) << 29)
> +
> +/* PHY DLL RECALIBRATE */
> +#define RECALIB_CNT(x) ((x) << 8)
> +#define DISABLE_RECALIB(x) ((x) << 26)
> +#define DELAY_START_VAL(x) ((x) << 28)
> +
> +/* PHY SCL CONFIG1 */
> +#define SCL_BURST8 BIT(0)
> +#define SCL_DDR_CONNECTED BIT(1)
> +#define SCL_RCAS_LAT(x) ((x) << 4)
> +#define SCL_ODTCSWW BIT(24)
> +
> +/* PHY SCL CONFIG2 */
> +#define SCL_CSEN BIT(0)
> +#define SCL_WCAS_LAT(x) ((x) << 8)
> +
> +/* PHY SCL Latency */
> +#define SCL_CAPCLKDLY(x) ((x) << 0)
> +#define SCL_DDRCLKDLY(x) ((x) << 4)
> +
> +/* PHY SCL START */
> +#define SCL_START BIT(28)
> +#define SCL_EN BIT(26)
> +#define SCL_LUBPASS (BIT(1) | BIT(0))
> +
> +#endif /* __MICROCHIP_DDR2_REGS_H */
> diff --git a/drivers/ddr/microchip/ddr2_timing.h b/drivers/ddr/microchip/ddr2_timing.h
> new file mode 100644
> index 0000000..928897e
> --- /dev/null
> +++ b/drivers/ddr/microchip/ddr2_timing.h
> @@ -0,0 +1,65 @@
> +/*
> + * (c) 2015 Purna Chandra Mandal <purna.mandal at microchip.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + *
> + */
> +
> +#ifndef __MICROCHIP_DDR2_TIMING_H
> +#define __MICROCHIP_DDR2_TIMING_H
> +
> +/* MPLL freq is 400MHz */
> +#define tCK 2500 /* 2500 psec */
> +#define tCK_CTRL (tCK * 2)
> +
> +/* Burst length in cycles */
> +#define BL 2
> +/* default CAS latency for all speed grades */
> +#define RL 5
> +/* default write latency for all speed grades = CL-1 */
> +#define WL 4
> +
> +/* From Micron MT47H64M16HR-3 data sheet */
> +#define tRFC_MIN 127500 /* psec */
> +#define tWR 15000 /* psec */
> +#define tRP 12500 /* psec */
> +#define tRCD 12500 /* psec */
> +#define tRRD 7500 /* psec */
> +/* tRRD_TCK is minimum of 2 clk periods, regardless of freq */
> +#define tRRD_TCK 2
> +#define tWTR 7500 /* psec */
> +/* tWTR_TCK is minimum of 2 clk periods, regardless of freq */
> +#define tWTR_TCK 2
> +#define tRTP 7500 /* psec */
> +#define tRTP_TCK (BL / 2)
> +#define tXP_TCK 2 /* clocks */
> +#define tCKE_TCK 3 /* clocks */
> +#define tXSNR (tRFC_MIN + 10000) /* psec */
> +#define tDLLK 200 /* clocks */
> +#define tRAS_MIN 45000 /* psec */
> +#define tRC 57500 /* psec */
> +#define tFAW 35000 /* psec */
> +#define tMRD_TCK 2 /* clocks */
> +#define tRFI 7800000 /* psec */
please avoid CamelCase. This should be renamed to something like this:
#define T_RFC_MIN
#define T_WR
> +
> +/* DDR Addressing */
> +#define COL_BITS 10
> +#define BA_BITS 3
> +#define ROW_BITS 13
> +#define CS_BITS 1
> +
> +/* DDR Addressing scheme: {CS, ROW, BA, COL} */
> +#define COL_HI_RSHFT 0
> +#define COL_HI_MASK 0
> +#define COL_LO_MASK ((1 << COL_BITS) - 1)
> +
> +#define BA_RSHFT COL_BITS
> +#define BA_MASK ((1 << BA_BITS) - 1)
> +
> +#define ROW_ADDR_RSHIFT (BA_RSHFT + BA_BITS)
> +#define ROW_ADDR_MASK ((1 << ROW_BITS) - 1)
> +
> +#define CS_ADDR_RSHIFT 0
> +#define CS_ADDR_MASK 0
> +
> +#endif /* __MICROCHIP_DDR2_TIMING_H */
> --
> 1.8.3.1
>
>
--
- Daniel
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