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177 lines
4.8 KiB
Diff
177 lines
4.8 KiB
Diff
From bcd97dbdcb7bc0300397db481872252e8849307b Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Mon, 25 Mar 2013 10:50:53 +0100
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Subject: [PATCH 207/208] owrt: MIPS: ralink: add support for runtime memory
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detection
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This allows us to add a device_node called "memorydetect" to the DT with
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information about the memory windoe of the SoC. Based on this the memory is
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detected ar runtime.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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arch/mips/include/asm/prom.h | 3 ++
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arch/mips/kernel/prom.c | 3 ++
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arch/mips/ralink/Makefile | 2 +-
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arch/mips/ralink/memory.c | 119 ++++++++++++++++++++++++++++++++++++++++++
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4 files changed, 126 insertions(+), 1 deletion(-)
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create mode 100644 arch/mips/ralink/memory.c
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--- a/arch/mips/include/asm/prom.h
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+++ b/arch/mips/include/asm/prom.h
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@@ -20,6 +20,9 @@
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extern int early_init_dt_scan_memory_arch(unsigned long node,
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const char *uname, int depth, void *data);
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+extern int early_init_dt_detect_memory(unsigned long node,
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+ const char *uname, int depth, void *data);
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+
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extern void device_tree_init(void);
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static inline unsigned long pci_address_to_pio(phys_addr_t address)
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--- a/arch/mips/kernel/prom.c
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+++ b/arch/mips/kernel/prom.c
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@@ -88,6 +88,9 @@ void __init early_init_devtree(void *par
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of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
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/* try to load the mips machine name */
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+ of_scan_flat_dt(early_init_dt_detect_memory, NULL);
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+
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+ /* try to load the mips machine name */
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of_scan_flat_dt(early_init_dt_scan_model, NULL);
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}
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--- a/arch/mips/ralink/Makefile
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+++ b/arch/mips/ralink/Makefile
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@@ -6,7 +6,7 @@
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# Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
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# Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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-obj-y := prom.o of.o reset.o clk.o irq.o pinmux.o timer.o
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+obj-y := prom.o of.o reset.o clk.o irq.o pinmux.o timer.o memory.o
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obj-$(CONFIG_SOC_RT288X) += rt288x.o
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obj-$(CONFIG_SOC_RT305X) += rt305x.o rt305x-usb.o
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--- /dev/null
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+++ b/arch/mips/ralink/memory.c
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@@ -0,0 +1,119 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
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+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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+ */
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+
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+#include <linux/string.h>
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+#include <linux/of_fdt.h>
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+#include <linux/of_platform.h>
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+
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+#include <asm/bootinfo.h>
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+#include <asm/addrspace.h>
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+
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+#include "common.h"
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+
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+#define MB (1024 * 1024)
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+
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+unsigned long ramips_mem_base;
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+unsigned long ramips_mem_size_min;
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+unsigned long ramips_mem_size_max;
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+
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+#ifdef CONFIG_SOC_RT305X
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+
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+#include <asm/mach-ralink/rt305x.h>
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+
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+static unsigned long rt5350_get_mem_size(void)
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+{
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+ void __iomem *sysc = (void __iomem *) KSEG1ADDR(RT305X_SYSC_BASE);
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+ unsigned long ret;
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+ u32 t;
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+
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+ t = __raw_readl(sysc + SYSC_REG_SYSTEM_CONFIG);
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+ t = (t >> RT5350_SYSCFG0_DRAM_SIZE_SHIFT) &
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+ RT5350_SYSCFG0_DRAM_SIZE_MASK;
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+
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+ switch (t) {
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+ case RT5350_SYSCFG0_DRAM_SIZE_2M:
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+ ret = 2 * 1024 * 1024;
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+ break;
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+ case RT5350_SYSCFG0_DRAM_SIZE_8M:
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+ ret = 8 * 1024 * 1024;
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+ break;
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+ case RT5350_SYSCFG0_DRAM_SIZE_16M:
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+ ret = 16 * 1024 * 1024;
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+ break;
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+ case RT5350_SYSCFG0_DRAM_SIZE_32M:
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+ ret = 32 * 1024 * 1024;
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+ break;
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+ case RT5350_SYSCFG0_DRAM_SIZE_64M:
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+ ret = 64 * 1024 * 1024;
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+ break;
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+ default:
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+ panic("rt5350: invalid DRAM size: %u", t);
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+ break;
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+ }
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+
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+ return ret;
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+}
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+
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+#endif
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+
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+static void __init detect_mem_size(void)
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+{
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+ unsigned long size;
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+
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+#ifdef CONFIG_SOC_RT305X
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+ if (soc_is_rt5350()) {
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+ size = rt5350_get_mem_size();
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+ } else
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+#endif
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+ {
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+ void *base;
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+
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+ base = (void *) KSEG1ADDR(detect_mem_size);
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+ for (size = ramips_mem_size_min; size < ramips_mem_size_max;
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+ size <<= 1 ) {
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+ if (!memcmp(base, base + size, 1024))
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+ break;
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+ }
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+ }
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+
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+ pr_info("memory detected: %uMB\n", (unsigned int) size / MB);
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+
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+ add_memory_region(ramips_mem_base, size, BOOT_MEM_RAM);
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+}
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+
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+int __init early_init_dt_detect_memory(unsigned long node, const char *uname,
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+ int depth, void *data)
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+{
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+ unsigned long l;
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+ __be32 *mem;
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+
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+ /* We are scanning "memorydetect" nodes only */
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+ if (depth != 1 || strcmp(uname, "memorydetect") != 0)
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+ return 0;
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+
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+ mem = of_get_flat_dt_prop(node, "ralink,memory", &l);
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+ if (mem == NULL)
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+ return 0;
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+
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+ if ((l / sizeof(__be32)) != 3)
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+ panic("invalid memorydetect node\n");
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+
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+ ramips_mem_base = dt_mem_next_cell(dt_root_addr_cells, &mem);
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+ ramips_mem_size_min = dt_mem_next_cell(dt_root_size_cells, &mem);
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+ ramips_mem_size_max = dt_mem_next_cell(dt_root_size_cells, &mem);
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+
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+ pr_info("memory window: 0x%llx, min: %uMB, max: %uMB\n",
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+ (unsigned long long) ramips_mem_base,
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+ (unsigned int) ramips_mem_size_min / MB,
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+ (unsigned int) ramips_mem_size_max / MB);
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+
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+ detect_mem_size();
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+
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+ return 0;
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+}
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