Read memory setup registers to determine size
of available ram. This routine works for mx53/mx6x
I need this because when mx6solo called get_ram_size
with a too large maximum size, the system hanged.
Signed-off-by: Troy Kisky <troy.ki...@boundarydevices.com>
---
New patch with V3. V2 had code in mx6qsabrelite.c
---
arch/arm/imx-common/cpu.c | 50 +++++++++++++++++++++++++++++
arch/arm/include/asm/arch-mx5/sys_proto.h | 1 +
arch/arm/include/asm/arch-mx6/sys_proto.h | 1 +
3 files changed, 52 insertions(+)
diff --git a/arch/arm/imx-common/cpu.c b/arch/arm/imx-common/cpu.c
index 102c254..5081908 100644
--- a/arch/arm/imx-common/cpu.c
+++ b/arch/arm/imx-common/cpu.c
@@ -65,6 +65,56 @@ char *get_reset_cause(void)
}
}
+#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};
+
+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;
+ uint32_t scr;
+ uint32_t ref;
+ uint32_t rsvd1;
+ uint32_t rsvd2;
+ uint32_t rwd;
+ uint32_t or;
+ uint32_t mrr;
+ uint32_t cfg3lp;
+ uint32_t mr4;
+};
+
+#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)
+
+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);
+ return 1 << bits;
+}
+#endif
+
#if defined(CONFIG_DISPLAY_CPUINFO)
const char *get_imx_type(u32 imxtype)
diff --git a/arch/arm/include/asm/arch-mx5/sys_proto.h
b/arch/arm/include/asm/arch-mx5/sys_proto.h
index 4435be1..93ad1c6 100644
--- a/arch/arm/include/asm/arch-mx5/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx5/sys_proto.h
@@ -33,6 +33,7 @@
#define is_soc_rev(rev) ((get_cpu_rev() & 0xFF) - rev)
u32 get_cpu_rev(void);
+unsigned imx_ddr_size(void);
void sdelay(unsigned long);
void set_chipselect_size(int const);
diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h
b/arch/arm/include/asm/arch-mx6/sys_proto.h
index 6627bbc..3193297 100644
--- a/arch/arm/include/asm/arch-mx6/sys_proto.h
+++ b/arch/arm/include/asm/arch-mx6/sys_proto.h
@@ -34,6 +34,7 @@
#define is_soc_rev(rev) ((get_cpu_rev() & 0xFF) - rev)
u32 get_cpu_rev(void);
const char *get_imx_type(u32 imxtype);
+unsigned imx_ddr_size(void);
void set_vddsoc(u32 mv);
--
1.7.9.5
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