On 02/06/2013 16:44, Sascha Hauer wrote:
On Fri, May 31, 2013 at 05:54:03PM +0100, Renaud Barbier wrote:
This file is imported from U-Boot as is.
This code provides the 8xxx memory controller core driver interface.
Signed-off-by: Renaud Barbier <renaud.barbier@xxxxxx>
---
arch/ppc/ddr-8xxx/main.c | 667 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 667 insertions(+), 0 deletions(-)
create mode 100644 arch/ppc/ddr-8xxx/main.c
[...]
+
+/*
+ * fsl_ddr_sdram() -- this is the main function to be called by
+ * initdram() in the board file.
+ *
+ * It returns amount of memory configured in bytes.
+ */
+phys_size_t fsl_ddr_sdram(void)
+{
THe behaviour of this function is defined by:
CONFIG_BUFFER_SIZE
CONFIG_CHIP_SELECT_QUAD_CAPABLE
CONFIG_CHIP_SELECTS_PER_CTRL
CONFIG_DDR_ECC
CONFIG_DDR_SPD
CONFIG_DIMM_SLOTS_PER_CTLR
CONFIG_E500MC
CONFIG_E6500
CONFIG_ECC_INIT_VIA_DDRCONTROLLER
CONFIG_FSL_DDR1
CONFIG_FSL_DDR2
CONFIG_FSL_DDR3
CONFIG_FSL_DDR_FIRST_SLOT_QUAD_CAPABLE
CONFIG_FSL_DDR_INTERACTIVE
CONFIG_FSL_SDRAM_TYPE
CONFIG_HWCONFIG
CONFIG_MAX_MEM_MAPPED
CONFIG_MEM_INIT_VALUE
CONFIG_NUM_DDR_CONTROLLERS
CONFIG_PHYS_64BIT
CONFIG_SPD_EEPROM
CONFIG_SYS_DDR_RAW_TIMING
CONFIG_SYS_DIMM_SLOTS_PER_CTLR
CONFIG_SYS_FSL_DDR_VER
CONFIG_SYS_IMMR
CONFIG_SYS_MPC8xxx_DDR2_ADDR
CONFIG_SYS_MPC8xxx_DDR3_ADDR
CONFIG_SYS_MPC8xxx_DDR_ADDR
CONFIG_SYS_NUM_DDR_CTLRS
Some of these a board specific, others are SoC specific, but all are
input parameters to this function. The prototype should really be:
phys_size_t mpc8xxx_setup_ddr(struct mpc8xxx_ddr_params *)
Actually there is already a structure "memctl_options_s" that could be
either extended or point to a board option structure. It is updated by
the board specific function: fsl_ddr_board_options.
(or maybe mpc8xxx_setup_ddr1/2/3 to be able to let the linker throw away
some unused code)
Code written in CPP rather than C was one of the major reasons why I
originally wrote barebox, so please let's not reintroduce this.
Sascha
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