x86: quark: Add Memory Reference Code (MRC) main routines

Add the main routines for Quark Memory Reference Code (MRC).

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

1 files changed, 204 insertions, 0 deletions

diff --git a/arch/x86/cpu/quark/mrc.c b/arch/x86/cpu/quark/mrc.c
new file mode 100644
index 0000000000..7eb34c5302
--- /dev/null
+++ b/arch/x86/cpu/quark/mrc.c
@@ -0,0 +1,204 @@
+/*
+ * Copyright (C) 2013, Intel Corporation
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * Ported from Intel released Quark UEFI BIOS
+ * QuarkSocPkg/QuarkNorthCluster/MemoryInit/Pei
+ *
+ * SPDX-License-Identifier:	Intel
+ */
+
+/*
+ * This is the main Quark Memory Reference Code (MRC)
+ *
+ * These functions are generic and should work for any Quark-based board.
+ *
+ * MRC requires two data structures to be passed in which are initialized by
+ * mrc_adjust_params().
+ *
+ * The basic flow is as follows:
+ * 01) Check for supported DDR speed configuration
+ * 02) Set up Memory Manager buffer as pass-through (POR)
+ * 03) Set Channel Interleaving Mode and Channel Stride to the most aggressive
+ *     setting possible
+ * 04) Set up the Memory Controller logic
+ * 05) Set up the DDR_PHY logic
+ * 06) Initialise the DRAMs (JEDEC)
+ * 07) Perform the Receive Enable Calibration algorithm
+ * 08) Perform the Write Leveling algorithm
+ * 09) Perform the Read Training algorithm (includes internal Vref)
+ * 10) Perform the Write Training algorithm
+ * 11) Set Channel Interleaving Mode and Channel Stride to the desired settings
+ *
+ * DRAM unit configuration based on Valleyview MRC.
+ */
+
+#include <common.h>
+#include <asm/arch/mrc.h>
+#include <asm/arch/msg_port.h>
+#include "mrc_util.h"
+#include "smc.h"
+
+static const struct mem_init init[] = {
+	{ 0x0101, BM_COLD | BM_FAST | BM_WARM | BM_S3, clear_self_refresh       },
+	{ 0x0200, BM_COLD | BM_FAST | BM_WARM | BM_S3, prog_ddr_timing_control  },
+	{ 0x0103, BM_COLD | BM_FAST                  , prog_decode_before_jedec },
+	{ 0x0104, BM_COLD | BM_FAST                  , perform_ddr_reset        },
+	{ 0x0300, BM_COLD | BM_FAST           | BM_S3, ddrphy_init              },
+	{ 0x0400, BM_COLD | BM_FAST                  , perform_jedec_init       },
+	{ 0x0105, BM_COLD | BM_FAST                  , set_ddr_init_complete    },
+	{ 0x0106,           BM_FAST | BM_WARM | BM_S3, restore_timings          },
+	{ 0x0106, BM_COLD                            , default_timings          },
+	{ 0x0500, BM_COLD                            , rcvn_cal                 },
+	{ 0x0600, BM_COLD                            , wr_level                 },
+	{ 0x0120, BM_COLD                            , prog_page_ctrl           },
+	{ 0x0700, BM_COLD                            , rd_train                 },
+	{ 0x0800, BM_COLD                            , wr_train                 },
+	{ 0x010b, BM_COLD                            , store_timings            },
+	{ 0x010c, BM_COLD | BM_FAST | BM_WARM | BM_S3, enable_scrambling        },
+	{ 0x010d, BM_COLD | BM_FAST | BM_WARM | BM_S3, prog_ddr_control         },
+	{ 0x010e, BM_COLD | BM_FAST | BM_WARM | BM_S3, prog_dra_drb             },
+	{ 0x010f,                     BM_WARM | BM_S3, perform_wake             },
+	{ 0x0110, BM_COLD | BM_FAST | BM_WARM | BM_S3, change_refresh_period    },
+	{ 0x0111, BM_COLD | BM_FAST | BM_WARM | BM_S3, set_auto_refresh         },
+	{ 0x0112, BM_COLD | BM_FAST | BM_WARM | BM_S3, ecc_enable               },
+	{ 0x0113, BM_COLD | BM_FAST                  , memory_test              },
+	{ 0x0114, BM_COLD | BM_FAST | BM_WARM | BM_S3, lock_registers           }
+};
+
+/* Adjust configuration parameters before initialization sequence */
+static void mrc_adjust_params(struct mrc_params *mrc_params)
+{
+	const struct dram_params *dram_params;
+	uint8_t dram_width;
+	uint32_t rank_enables;
+	uint32_t channel_width;
+
+	ENTERFN();
+
+	/* initially expect success */
+	mrc_params->status = MRC_SUCCESS;
+
+	dram_width = mrc_params->dram_width;
+	rank_enables = mrc_params->rank_enables;
+	channel_width = mrc_params->channel_width;
+
+	/*
+	 * Setup board layout (must be reviewed as is selecting static timings)
+	 * 0 == R0 (DDR3 x16), 1 == R1 (DDR3 x16),
+	 * 2 == DV (DDR3 x8), 3 == SV (DDR3 x8).
+	 */
+	if (dram_width == X8)
+		mrc_params->board_id = 2;	/* select x8 layout */
+	else
+		mrc_params->board_id = 0;	/* select x16 layout */
+
+	/* initially no memory */
+	mrc_params->mem_size = 0;
+
+	/* begin of channel settings */
+	dram_params = &mrc_params->params;
+
+	/*
+	 * Determine column bits:
+	 *
+	 * Column: 11 for 8Gbx8, else 10
+	 */
+	mrc_params->column_bits[0] =
+		((dram_params[0].density == 4) &&
+		(dram_width == X8)) ? (11) : (10);
+
+	/*
+	 * Determine row bits:
+	 *
+	 * 512Mbx16=12 512Mbx8=13
+	 * 1Gbx16=13   1Gbx8=14
+	 * 2Gbx16=14   2Gbx8=15
+	 * 4Gbx16=15   4Gbx8=16
+	 * 8Gbx16=16   8Gbx8=16
+	 */
+	mrc_params->row_bits[0] = 12 + (dram_params[0].density) +
+		(((dram_params[0].density < 4) &&
+		(dram_width == X8)) ? (1) : (0));
+
+	/*
+	 * Determine per-channel memory size:
+	 *
+	 * (For 2 RANKs, multiply by 2)
+	 * (For 16 bit data bus, divide by 2)
+	 *
+	 * DENSITY WIDTH MEM_AVAILABLE
+	 * 512Mb   x16   0x008000000 ( 128MB)
+	 * 512Mb   x8    0x010000000 ( 256MB)
+	 * 1Gb     x16   0x010000000 ( 256MB)
+	 * 1Gb     x8    0x020000000 ( 512MB)
+	 * 2Gb     x16   0x020000000 ( 512MB)
+	 * 2Gb     x8    0x040000000 (1024MB)
+	 * 4Gb     x16   0x040000000 (1024MB)
+	 * 4Gb     x8    0x080000000 (2048MB)
+	 */
+	mrc_params->channel_size[0] = (1 << dram_params[0].density);
+	mrc_params->channel_size[0] *= (dram_width == X8) ? 2 : 1;
+	mrc_params->channel_size[0] *= (rank_enables == 0x3) ? 2 : 1;
+	mrc_params->channel_size[0] *= (channel_width == X16) ? 1 : 2;
+
+	/* Determine memory size (convert number of 64MB/512Mb units) */
+	mrc_params->mem_size += mrc_params->channel_size[0] << 26;
+
+	LEAVEFN();
+}
+
+static void mrc_mem_init(struct mrc_params *mrc_params)
+{
+	int i;
+
+	ENTERFN();
+
+	/* MRC started */
+	mrc_post_code(0x01, 0x00);
+
+	if (mrc_params->boot_mode != BM_COLD) {
+		if (mrc_params->ddr_speed != mrc_params->timings.ddr_speed) {
+			/* full training required as frequency changed */
+			mrc_params->boot_mode = BM_COLD;
+		}
+	}
+
+	for (i = 0; i < ARRAY_SIZE(init); i++) {
+		uint64_t my_tsc;
+
+		if (mrc_params->boot_mode & init[i].boot_path) {
+			uint8_t major = init[i].post_code >> 8 & 0xff;
+			uint8_t minor = init[i].post_code >> 0 & 0xff;
+			mrc_post_code(major, minor);
+
+			my_tsc = rdtsc();
+			init[i].init_fn(mrc_params);
+			DPF(D_TIME, "Execution time %llx", rdtsc() - my_tsc);
+		}
+	}
+
+	/* display the timings */
+	print_timings(mrc_params);
+
+	/* MRC complete */
+	mrc_post_code(0x01, 0xff);
+
+	LEAVEFN();
+}
+
+void mrc_init(struct mrc_params *mrc_params)
+{
+	ENTERFN();
+
+	DPF(D_INFO, "MRC Version %04x %s %s\n", MRC_VERSION,
+	    __DATE__, __TIME__);
+
+	/* Set up the data structures used by mrc_mem_init() */
+	mrc_adjust_params(mrc_params);
+
+	/* Initialize system memory */
+	mrc_mem_init(mrc_params);
+
+	LEAVEFN();
+}