diff options
Diffstat (limited to 'drivers/ddr/microchip/ddr2.c')
-rw-r--r-- | drivers/ddr/microchip/ddr2.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/drivers/ddr/microchip/ddr2.c b/drivers/ddr/microchip/ddr2.c new file mode 100644 index 0000000..6056418 --- /dev/null +++ b/drivers/ddr/microchip/ddr2.c @@ -0,0 +1,278 @@ +/* + * (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; +} |