FSL DDR: Rewrite the FSL mpc8xxx DDR controller setup code.

The main purpose of this rewrite it to be able to share the same
initialization code on all FSL PowerPC products that have DDR
controllers.  (83xx, 85xx, 86xx).

The code is broken up into the following steps:
	GET_SPD
	COMPUTE_DIMM_PARMS
	COMPUTE_COMMON_PARMS
	GATHER_OPTS
	ASSIGN_ADDRESSES
	COMPUTE_REGS
	PROGRAM_REGS

This allows us to share more code an easily allow for board specific code
overrides.

Additionally this code base adds support for >4G of DDR and provides a
foundation for supporting interleaving on processors with more than one
controller.

Signed-off-by: James Yang <James.Yang@freescale.com>
Signed-off-by: Jon Loeliger <jdl@freescale.com>
Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 80 insertions, 0 deletions

diff --git a/cpu/mpc8xxx/ddr/ddr.h b/cpu/mpc8xxx/ddr/ddr.h
new file mode 100644
index 0000000..f5dc40a
--- /dev/null
+++ b/cpu/mpc8xxx/ddr/ddr.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * Version 2 as published by the Free Software Foundation.
+ */
+
+#ifndef FSL_DDR_MAIN_H
+#define FSL_DDR_MAIN_H
+
+#include <asm/fsl_ddr_sdram.h>
+
+#include "ddr1_2_dimm_params.h"
+#include "common_timing_params.h"
+
+/*
+ * Bind the main DDR setup driver's generic names
+ * to this specific DDR technology.
+ */
+static __inline__ int
+compute_dimm_parameters(const generic_spd_eeprom_t *spd,
+			dimm_params_t *pdimm,
+			unsigned int dimm_number)
+{
+	return ddr_compute_dimm_parameters(spd, pdimm, dimm_number);
+}
+
+/*
+ * Data Structures
+ *
+ * All data structures have to be on the stack
+ */
+#define CFG_NUM_DDR_CTLRS CONFIG_NUM_DDR_CONTROLLERS
+#define CFG_DIMM_SLOTS_PER_CTLR CONFIG_DIMM_SLOTS_PER_CTLR
+
+typedef struct {
+	generic_spd_eeprom_t
+	   spd_installed_dimms[CFG_NUM_DDR_CTLRS][CFG_DIMM_SLOTS_PER_CTLR];
+	struct dimm_params_s
+	   dimm_params[CFG_NUM_DDR_CTLRS][CFG_DIMM_SLOTS_PER_CTLR];
+	memctl_options_t memctl_opts[CFG_NUM_DDR_CTLRS];
+	common_timing_params_t common_timing_params[CFG_NUM_DDR_CTLRS];
+	fsl_ddr_cfg_regs_t fsl_ddr_config_reg[CFG_NUM_DDR_CTLRS];
+} fsl_ddr_info_t;
+
+/* Compute steps */
+#define STEP_GET_SPD                 (1 << 0)
+#define STEP_COMPUTE_DIMM_PARMS      (1 << 1)
+#define STEP_COMPUTE_COMMON_PARMS    (1 << 2)
+#define STEP_GATHER_OPTS             (1 << 3)
+#define STEP_ASSIGN_ADDRESSES        (1 << 4)
+#define STEP_COMPUTE_REGS            (1 << 5)
+#define STEP_PROGRAM_REGS            (1 << 6)
+#define STEP_ALL                     0xFFF
+
+extern phys_size_t
+fsl_ddr_compute(fsl_ddr_info_t *pinfo, unsigned int start_step);
+
+extern const char * step_to_string(unsigned int step);
+
+extern unsigned int
+compute_fsl_memctl_config_regs(const memctl_options_t *popts,
+			       fsl_ddr_cfg_regs_t *ddr,
+			       const common_timing_params_t *common_dimm,
+			       const dimm_params_t *dimm_parameters,
+			       unsigned int dbw_capacity_adjust);
+extern unsigned int
+compute_lowest_common_dimm_parameters(const dimm_params_t *dimm_params,
+				      common_timing_params_t *outpdimm,
+				      unsigned int number_of_dimms);
+extern unsigned int populate_memctl_options(int all_DIMMs_registered,
+				memctl_options_t *popts,
+				unsigned int ctrl_num);
+
+extern unsigned int mclk_to_picos(unsigned int mclk);
+extern unsigned int get_memory_clk_period_ps(void);
+extern unsigned int picos_to_mclk(unsigned int picos);
+
+#endif