From 89bc388a320a0a42c60582b02264a0d95c287c3b Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Thu, 18 Jul 2019 15:04:22 -0300 Subject: [PATCH] imx: Place imx_ddr_size() into a separate file Place imx_ddr_size() into a separate file. The motivation for doing this is to be able to easily reuse imx_ddr_size() on i.MX7ULP. Currently imx_ddr_size() is inside arch/arm/mach-imx/cpu.c, which is not built for i.MX7ULP. Changing the logic to allow building cpu.c for i.MX7UP would require adding several ifdef's, leading to a not a very elegant solution. To allow better reuse, just place imx_ddr_size() into a common mmdc_size.c file. Signed-off-by: Fabio Estevam Signed-off-by: Stefano Babic --- arch/arm/mach-imx/Makefile | 3 ++ arch/arm/mach-imx/cpu.c | 53 --------------------------------- arch/arm/mach-imx/mmdc_size.c | 55 +++++++++++++++++++++++++++++++++++ 3 files changed, 58 insertions(+), 53 deletions(-) create mode 100644 arch/arm/mach-imx/mmdc_size.c diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile index fbd99a3499..cb6ef533de 100644 --- a/arch/arm/mach-imx/Makefile +++ b/arch/arm/mach-imx/Makefile @@ -21,6 +21,9 @@ endif ifeq ($(SOC),$(filter $(SOC),mx5 mx6)) obj-y += cpu.o speed.o +ifneq ($(CONFIG_MX51),y) +obj-y += mmdc_size.o +endif obj-$(CONFIG_GPT_TIMER) += timer.o obj-$(CONFIG_SYS_I2C_MXC) += i2c-mxv7.o endif diff --git a/arch/arm/mach-imx/cpu.c b/arch/arm/mach-imx/cpu.c index efd8fc614a..d39f607e3f 100644 --- a/arch/arm/mach-imx/cpu.c +++ b/arch/arm/mach-imx/cpu.c @@ -87,59 +87,6 @@ static char *get_reset_cause(void) } #endif -#if defined(CONFIG_MX53) || defined(CONFIG_MX6) -#if defined(CONFIG_MX53) -#define MEMCTL_BASE ESDCTL_BASE_ADDR -#else -#define MEMCTL_BASE MMDC_P0_BASE_ADDR -#endif -static const unsigned char col_lookup[] = {9, 10, 11, 8, 12, 9, 9, 9}; -static const unsigned char bank_lookup[] = {3, 2}; - -/* these MMDC registers are common to the IMX53 and IMX6 */ -struct esd_mmdc_regs { - uint32_t ctl; - uint32_t pdc; - uint32_t otc; - uint32_t cfg0; - uint32_t cfg1; - uint32_t cfg2; - uint32_t misc; -}; - -#define ESD_MMDC_CTL_GET_ROW(mdctl) ((ctl >> 24) & 7) -#define ESD_MMDC_CTL_GET_COLUMN(mdctl) ((ctl >> 20) & 7) -#define ESD_MMDC_CTL_GET_WIDTH(mdctl) ((ctl >> 16) & 3) -#define ESD_MMDC_CTL_GET_CS1(mdctl) ((ctl >> 30) & 1) -#define ESD_MMDC_MISC_GET_BANK(mdmisc) ((misc >> 5) & 1) - -/* - * imx_ddr_size - return size in bytes of DRAM according MMDC config - * The MMDC MDCTL register holds the number of bits for row, col, and data - * width and the MMDC MDMISC register holds the number of banks. Combine - * all these bits to determine the meme size the MMDC has been configured for - */ -unsigned imx_ddr_size(void) -{ - struct esd_mmdc_regs *mem = (struct esd_mmdc_regs *)MEMCTL_BASE; - unsigned ctl = readl(&mem->ctl); - unsigned misc = readl(&mem->misc); - int bits = 11 + 0 + 0 + 1; /* row + col + bank + width */ - - bits += ESD_MMDC_CTL_GET_ROW(ctl); - bits += col_lookup[ESD_MMDC_CTL_GET_COLUMN(ctl)]; - bits += bank_lookup[ESD_MMDC_MISC_GET_BANK(misc)]; - bits += ESD_MMDC_CTL_GET_WIDTH(ctl); - bits += ESD_MMDC_CTL_GET_CS1(ctl); - - /* The MX6 can do only 3840 MiB of DRAM */ - if (bits == 32) - return 0xf0000000; - - return 1 << bits; -} -#endif - #if defined(CONFIG_DISPLAY_CPUINFO) && !defined(CONFIG_SPL_BUILD) const char *get_imx_type(u32 imxtype) diff --git a/arch/arm/mach-imx/mmdc_size.c b/arch/arm/mach-imx/mmdc_size.c new file mode 100644 index 0000000000..8a3c6bdea6 --- /dev/null +++ b/arch/arm/mach-imx/mmdc_size.c @@ -0,0 +1,55 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include +#include + +#if defined(CONFIG_MX53) +#define MEMCTL_BASE ESDCTL_BASE_ADDR +#else +#define MEMCTL_BASE MMDC_P0_BASE_ADDR +#endif +static const unsigned char col_lookup[] = {9, 10, 11, 8, 12, 9, 9, 9}; +static const unsigned char bank_lookup[] = {3, 2}; + +/* these MMDC registers are common to the IMX53 and IMX6 */ +struct esd_mmdc_regs { + uint32_t ctl; + uint32_t pdc; + uint32_t otc; + uint32_t cfg0; + uint32_t cfg1; + uint32_t cfg2; + uint32_t misc; +}; + +#define ESD_MMDC_CTL_GET_ROW(mdctl) ((ctl >> 24) & 7) +#define ESD_MMDC_CTL_GET_COLUMN(mdctl) ((ctl >> 20) & 7) +#define ESD_MMDC_CTL_GET_WIDTH(mdctl) ((ctl >> 16) & 3) +#define ESD_MMDC_CTL_GET_CS1(mdctl) ((ctl >> 30) & 1) +#define ESD_MMDC_MISC_GET_BANK(mdmisc) ((misc >> 5) & 1) + +/* + * imx_ddr_size - return size in bytes of DRAM according MMDC config + * The MMDC MDCTL register holds the number of bits for row, col, and data + * width and the MMDC MDMISC register holds the number of banks. Combine + * all these bits to determine the meme size the MMDC has been configured for + */ +unsigned imx_ddr_size(void) +{ + struct esd_mmdc_regs *mem = (struct esd_mmdc_regs *)MEMCTL_BASE; + unsigned ctl = readl(&mem->ctl); + unsigned misc = readl(&mem->misc); + int bits = 11 + 0 + 0 + 1; /* row + col + bank + width */ + + bits += ESD_MMDC_CTL_GET_ROW(ctl); + bits += col_lookup[ESD_MMDC_CTL_GET_COLUMN(ctl)]; + bits += bank_lookup[ESD_MMDC_MISC_GET_BANK(misc)]; + bits += ESD_MMDC_CTL_GET_WIDTH(ctl); + bits += ESD_MMDC_CTL_GET_CS1(ctl); + + /* The MX6 can do only 3840 MiB of DRAM */ + if (bits == 32) + return 0xf0000000; + + return 1 << bits; +} -- 2.25.1