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drivers: ddr: Add DDR2 SDRAM controller driver for Microchip PIC32.

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This driver initializes PIC32 DDR2 SDRAM controller and internal DDR2 Phy module.
DDR2 controller operates in half-rate mode (upto 533MHZ frequency).

Signed-off-by: Paul Thacker <paul.thacker@microchip.com>
Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Purna Chandra Mandal 2016-01-28 15:30:15 +05:30 committed by Daniel Schwierzeck
parent 9e160ee823
commit 9ffa7a35ef
6 changed files with 530 additions and 0 deletions
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32
arch/mips/mach-pic32/include/mach/ddr.h Normal file
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/*
* (c) 2015 Purna Chandra Mandal <purna.mandal@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 */
};
const struct ddr2_arbiter_params *board_get_ddr_arbiter_params(void);
#endif /* __MICROCHIP_PIC32_DDR_H */

1
drivers/Makefile
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@ -69,4 +69,5 @@ obj-y += soc/
obj-$(CONFIG_REMOTEPROC) += remoteproc/
obj-y += thermal/
obj-$(CONFIG_MACH_PIC32) += ddr/microchip/
endif

6
drivers/ddr/microchip/Makefile Normal file
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#
# Copyright (C) 2015 Microchip Technology Inc.
#
# SPDX-License-Identifier: GPL-2.0+
#
obj-$(CONFIG_MACH_PIC32) += ddr2.o

278
drivers/ddr/microchip/ddr2.c Normal file
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/*
* (c) 2015 Paul Thacker <paul.thacker@microchip.com>
*
* SPDX-License-Identifier: GPL-2.0+
*
*/
#include <common.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 = ioremap(PIC32_DDR2P_BASE, sizeof(*ddr2_phy));
/* 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 = ioremap(PIC32_DDR2P_BASE, sizeof(*ddr2_phy));
/* 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,
const struct ddr2_arbiter_params *const param)
{
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);
}
}
const struct ddr2_arbiter_params *__weak board_get_ddr_arbiter_params(void)
{
/* default arbiter parameters */
static const 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,},
};
return &arb_params[0];
}
static void host_load_cmd(struct ddr2_ctrl_regs *ctrl, u32 cmd_idx,
u32 hostcmd2, u32 hostcmd1, u32 delay)
{
u32 hc_delay;
hc_delay = max_t(u32, DIV_ROUND_UP(delay, T_CK), 2) - 2;
writel(hostcmd1, &ctrl->cmd10[cmd_idx]);
writel((hostcmd2 & 0x7ff) | (hc_delay << 11), &ctrl->cmd20[cmd_idx]);
}
/* init DDR2 Controller */
void ddr2_ctrl_init(void)
{
u32 wr2prech, rd2prech, wr2rd, wr2rd_cs;
u32 ras2ras, ras2cas, prech2ras, temp;
const struct ddr2_arbiter_params *arb_params;
struct ddr2_ctrl_regs *ctrl;
ctrl = ioremap(PIC32_DDR2C_BASE, sizeof(*ctrl));
/* 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(T_RFI, T_CK_CTRL) - 2) |
REFDLY_CLK(DIV_ROUND_UP(T_RFC_MIN, T_CK_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(T_WTR, T_CK_CTRL),
DIV_ROUND_UP(T_WTR_TCK, 2)) + WL + BL;
wr2rd_cs = max_t(u32, wr2rd - 1, 3);
wr2prech = DIV_ROUND_UP(T_WR, T_CK_CTRL) + WL + BL;
rd2prech = max_t(u32, DIV_ROUND_UP(T_RTP, T_CK_CTRL),
DIV_ROUND_UP(T_RTP_TCK, 2)) + BL - 2;
ras2ras = max_t(u32, DIV_ROUND_UP(T_RRD, T_CK_CTRL),
DIV_ROUND_UP(T_RRD_TCK, 2)) - 1;
ras2cas = DIV_ROUND_UP(T_RCD, T_CK_CTRL) - 1;
prech2ras = DIV_ROUND_UP(T_RP, T_CK_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(((T_CKE_TCK - 1) |
(((DIV_ROUND_UP(T_DLLK, 2) - 2) & 0xff) << 8) |
((T_CKE_TCK - 1) << 16) |
((max_t(u32, T_XP_TCK, T_CKE_TCK) - 1) << 20) |
((wr2prech >> 4) << 26) |
((wr2rd >> 4) << 27) |
((wr2rd_cs >> 4) << 28) |
(((RL + 5) >> 4) << 29) |
((DIV_ROUND_UP(T_DLLK, 2) >> 8) << 30)), &ctrl->dlycfg1);
writel((DIV_ROUND_UP(T_RP, T_CK_CTRL) |
(rd2prech << 8) |
((wr2prech & 0x0f) << 12) |
(ras2ras << 16) |
(ras2cas << 20) |
(prech2ras << 24) |
((RL + 3) << 28)), &ctrl->dlycfg2);
writel(((DIV_ROUND_UP(T_RAS_MIN, T_CK_CTRL) - 1) |
((DIV_ROUND_UP(T_RC, T_CK_CTRL) - 1) << 8) |
((DIV_ROUND_UP(T_FAW, T_CK_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, 1, 0x04, PRECH_ALL_CMD, T_RP + T_CK);
/* initialize EMR2 */
host_load_cmd(ctrl, 2, 0x200, LOAD_MODE_CMD, T_MRD_TCK * T_CK);
/* initialize EMR3 */
host_load_cmd(ctrl, 3, 0x300, LOAD_MODE_CMD, T_MRD_TCK * T_CK);
/*
* RDQS disable, DQSB enable, OCD exit, 150 ohm termination,
* AL=0, DLL enable
*/
host_load_cmd(ctrl, 4, 0x100,
LOAD_MODE_CMD | (0x40 << 24), T_MRD_TCK * T_CK);
/*
* PD fast exit, WR REC = T_WR in clocks -1,
* DLL reset, CAS = RL, burst = 4
*/
temp = ((DIV_ROUND_UP(T_WR, T_CK) - 1) << 1) | 1;
host_load_cmd(ctrl, 5, temp, LOAD_MODE_CMD | (RL << 28) | (2 << 24),
T_MRD_TCK * T_CK);
/* issue precharge all command */
host_load_cmd(ctrl, 6, 4, PRECH_ALL_CMD, T_RP + T_CK);
/* issue refresh command */
host_load_cmd(ctrl, 7, 0, REF_CMD, T_RFC_MIN);
/* issue refresh command */
host_load_cmd(ctrl, 8, 0, REF_CMD, T_RFC_MIN);
/* Mode register programming as before without DLL reset */
host_load_cmd(ctrl, 9, temp, LOAD_MODE_CMD | (RL << 28) | (3 << 24),
T_MRD_TCK * T_CK);
/* extended mode register same as before with OCD default */
host_load_cmd(ctrl, 10, 0x103, LOAD_MODE_CMD | (0xc << 24),
T_MRD_TCK * T_CK);
/* extended mode register same as before with OCD exit */
host_load_cmd(ctrl, 11, 0x100, LOAD_MODE_CMD | (0x4 << 28),
140 * T_CK);
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 */
if (ddr2_phy_calib_start())
printf("ddr2: phy calib failed\n");
}
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;
}

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drivers/ddr/microchip/ddr2_regs.h Normal file
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/*
* (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
*
* SPDX-License-Identifier: GPL-2.0+
*
*/
#ifndef __MICROCHIP_DDR2_REGS_H
#define __MICROCHIP_DDR2_REGS_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[16];
u32 cmd20[16];
};
/* 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 */

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drivers/ddr/microchip/ddr2_timing.h Normal file
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/*
* (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
*
* SPDX-License-Identifier: GPL-2.0+
*
*/
#ifndef __MICROCHIP_DDR2_TIMING_H
#define __MICROCHIP_DDR2_TIMING_H
/* MPLL freq is 400MHz */
#define T_CK 2500 /* 2500 psec */
#define T_CK_CTRL (T_CK * 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 T_RFC_MIN 127500 /* psec */
#define T_WR 15000 /* psec */
#define T_RP 12500 /* psec */
#define T_RCD 12500 /* psec */
#define T_RRD 7500 /* psec */
/* T_RRD_TCK is minimum of 2 clk periods, regardless of freq */
#define T_RRD_TCK 2
#define T_WTR 7500 /* psec */
/* T_WTR_TCK is minimum of 2 clk periods, regardless of freq */
#define T_WTR_TCK 2
#define T_RTP 7500 /* psec */
#define T_RTP_TCK (BL / 2)
#define T_XP_TCK 2 /* clocks */
#define T_CKE_TCK 3 /* clocks */
#define T_XSNR (T_RFC_MIN + 10000) /* psec */
#define T_DLLK 200 /* clocks */
#define T_RAS_MIN 45000 /* psec */
#define T_RC 57500 /* psec */
#define T_FAW 35000 /* psec */
#define T_MRD_TCK 2 /* clocks */
#define T_RFI 7800000 /* psec */
/* 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 */