drivers: ddr: introduce DDR driver for i.MX8M

Introduce DDR driver for i.MX8M. The driver will be used by SPL to
initialze DDR PHY and DDR Controller.

Signed-off-by: Peng Fan <peng.fan@nxp.com>

1 files changed, 186 insertions, 0 deletions

diff --git a/drivers/ddr/imx/imx8m/ddrphy_utils.c b/drivers/ddr/imx/imx8m/ddrphy_utils.c
new file mode 100644
index 0000000000..4732539764
--- /dev/null
+++ b/drivers/ddr/imx/imx8m/ddrphy_utils.c
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+* Copyright 2018 NXP
+*/
+
+#include <common.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <asm/arch/ddr.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/ddr.h>
+#include <asm/arch/lpddr4_define.h>
+
+static inline void poll_pmu_message_ready(void)
+{
+	unsigned int reg;
+
+	do {
+		reg = reg32_read(IP2APB_DDRPHY_IPS_BASE_ADDR(0) + 4 * 0xd0004);
+	} while (reg & 0x1);
+}
+
+static inline void ack_pmu_message_receive(void)
+{
+	unsigned int reg;
+
+	reg32_write(IP2APB_DDRPHY_IPS_BASE_ADDR(0) + 4 * 0xd0031, 0x0);
+
+	do {
+		reg = reg32_read(IP2APB_DDRPHY_IPS_BASE_ADDR(0) + 4 * 0xd0004);
+	} while (!(reg & 0x1));
+
+	reg32_write(IP2APB_DDRPHY_IPS_BASE_ADDR(0) + 4 * 0xd0031, 0x1);
+}
+
+static inline unsigned int get_mail(void)
+{
+	unsigned int reg;
+
+	poll_pmu_message_ready();
+
+	reg = reg32_read(IP2APB_DDRPHY_IPS_BASE_ADDR(0) + 4 * 0xd0032);
+
+	ack_pmu_message_receive();
+
+	return reg;
+}
+
+static inline unsigned int get_stream_message(void)
+{
+	unsigned int reg, reg2;
+
+	poll_pmu_message_ready();
+
+	reg = reg32_read(IP2APB_DDRPHY_IPS_BASE_ADDR(0) + 4 * 0xd0032);
+
+	reg2 = reg32_read(IP2APB_DDRPHY_IPS_BASE_ADDR(0) + 4 * 0xd0034);
+
+	reg2 = (reg2 << 16) | reg;
+
+	ack_pmu_message_receive();
+
+	return reg2;
+}
+
+static inline void decode_major_message(unsigned int mail)
+{
+	debug("[PMU Major message = 0x%08x]\n", mail);
+}
+
+static inline void decode_streaming_message(void)
+{
+	unsigned int string_index, arg __maybe_unused;
+	int i = 0;
+
+	string_index = get_stream_message();
+	debug("PMU String index = 0x%08x\n", string_index);
+	while (i < (string_index & 0xffff)) {
+		arg = get_stream_message();
+		debug("arg[%d] = 0x%08x\n", i, arg);
+		i++;
+	}
+
+	debug("\n");
+}
+
+void wait_ddrphy_training_complete(void)
+{
+	unsigned int mail;
+
+	while (1) {
+		mail = get_mail();
+		decode_major_message(mail);
+		if (mail == 0x08) {
+			decode_streaming_message();
+		} else if (mail == 0x07) {
+			debug("Training PASS\n");
+			break;
+		} else if (mail == 0xff) {
+			printf("Training FAILED\n");
+			break;
+		}
+	}
+}
+
+void ddrphy_init_set_dfi_clk(unsigned int drate)
+{
+	switch (drate) {
+	case 3200:
+		dram_pll_init(MHZ(800));
+		dram_disable_bypass();
+		break;
+	case 3000:
+		dram_pll_init(MHZ(750));
+		dram_disable_bypass();
+		break;
+	case 2400:
+		dram_pll_init(MHZ(600));
+		dram_disable_bypass();
+		break;
+	case 1600:
+		dram_pll_init(MHZ(400));
+		dram_disable_bypass();
+		break;
+	case 667:
+		dram_pll_init(MHZ(167));
+		dram_disable_bypass();
+		break;
+	case 400:
+		dram_enable_bypass(MHZ(400));
+		break;
+	case 100:
+		dram_enable_bypass(MHZ(100));
+		break;
+	default:
+		return;
+	}
+}
+
+void ddrphy_init_read_msg_block(enum fw_type type)
+{
+}
+
+void lpddr4_mr_write(unsigned int mr_rank, unsigned int mr_addr,
+		     unsigned int mr_data)
+{
+	unsigned int tmp;
+	/*
+	 * 1. Poll MRSTAT.mr_wr_busy until it is 0.
+	 * This checks that there is no outstanding MR transaction.
+	 * No writes should be performed to MRCTRL0 and MRCTRL1 if
+	 * MRSTAT.mr_wr_busy = 1.
+	 */
+	do {
+		tmp = reg32_read(DDRC_MRSTAT(0));
+	} while (tmp & 0x1);
+	/*
+	 * 2. Write the MRCTRL0.mr_type, MRCTRL0.mr_addr, MRCTRL0.mr_rank and
+	 * (for MRWs) MRCTRL1.mr_data to define the MR transaction.
+	 */
+	reg32_write(DDRC_MRCTRL0(0), (mr_rank << 4));
+	reg32_write(DDRC_MRCTRL1(0), (mr_addr << 8) | mr_data);
+	reg32setbit(DDRC_MRCTRL0(0), 31);
+}
+
+unsigned int lpddr4_mr_read(unsigned int mr_rank, unsigned int mr_addr)
+{
+	unsigned int tmp;
+
+	reg32_write(DRC_PERF_MON_MRR0_DAT(0), 0x1);
+	do {
+		tmp = reg32_read(DDRC_MRSTAT(0));
+	} while (tmp & 0x1);
+
+	reg32_write(DDRC_MRCTRL0(0), (mr_rank << 4) | 0x1);
+	reg32_write(DDRC_MRCTRL1(0), (mr_addr << 8));
+	reg32setbit(DDRC_MRCTRL0(0), 31);
+	do {
+		tmp = reg32_read(DRC_PERF_MON_MRR0_DAT(0));
+	} while ((tmp & 0x8) == 0);
+	tmp = reg32_read(DRC_PERF_MON_MRR1_DAT(0));
+	tmp = tmp & 0xff;
+	reg32_write(DRC_PERF_MON_MRR0_DAT(0), 0x4);
+
+	return tmp;
+}