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MIPS: ingenic: Hardcode mem size for qi,lb60 board

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Old Device Tree for the qi,lb60 (aka. Ben Nanonote) did not have a
'memory' node. The kernel would then read the memory controller
registers to know how much RAM was available.

Since every other supported board has had a 'memory' node from the
beginning, we can just hardcode a RAM size of 32 MiB when running with
an old Device Tree without the 'memory' node.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Paul Cercueil 2020-07-30 18:12:33 +02:00 committed by Thomas Bogendoerfer
parent 714b649dc7
commit 48f5dd56cf
1 changed files with 8 additions and 29 deletions
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37
arch/mips/jz4740/setup.c
View file

@ -14,6 +14,7 @@
#include <linux/of_clk.h>
#include <linux/of_fdt.h>
#include <linux/pm.h>
#include <linux/sizes.h>
#include <linux/suspend.h>
#include <asm/bootinfo.h>
@ -22,31 +23,6 @@
#include <asm/reboot.h>
#include <asm/time.h>
#define JZ4740_EMC_BASE_ADDR 0x13010000
#define JZ4740_EMC_SDRAM_CTRL 0x80
static void __init jz4740_detect_mem(void)
{
void __iomem *jz_emc_base;
u32 ctrl, bus, bank, rows, cols;
phys_addr_t size;
jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
bus = 2 - ((ctrl >> 31) & 1);
bank = 1 + ((ctrl >> 19) & 1);
cols = 8 + ((ctrl >> 26) & 7);
rows = 11 + ((ctrl >> 20) & 3);
printk(KERN_DEBUG
"SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",
bus, bank, rows, cols);
iounmap(jz_emc_base);
size = 1 << (bus + bank + cols + rows);
add_memory_region(0, size, BOOT_MEM_RAM);
}
static unsigned long __init get_board_mach_type(const void *fdt)
{
if (!fdt_node_check_compatible(fdt, 0, "ingenic,x2000"))
@ -68,13 +44,16 @@ static unsigned long __init get_board_mach_type(const void *fdt)
void __init plat_mem_setup(void)
{
void *dtb = (void *)fw_passed_dtb;
int offset;
__dt_setup_arch(dtb);
offset = fdt_path_offset(dtb, "/memory");
if (offset < 0)
jz4740_detect_mem();
/*
* Old devicetree files for the qi,lb60 board did not have a /memory
* node. Hardcode the memory info here.
*/
if (!fdt_node_check_compatible(dtb, 0, "qi,lb60") &&
fdt_path_offset(dtb, "/memory") < 0)
early_init_dt_add_memory_arch(0, SZ_32M);
mips_machtype = get_board_mach_type(dtb);
}