da77b9c2f1
Deleted (reverse-appliable): generic/pending-5.10/110-perf-jevents-fix-getting-maximum-number-of-fds.patch Manually refreshed: ramips/patches-5.10/835-asoc-add-mt7620-support.patch Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
130 lines
4.2 KiB
Diff
130 lines
4.2 KiB
Diff
From b5a52351a66f3c2a7a207548aa87d78ff2d336c0 Mon Sep 17 00:00:00 2001
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From: Chuanhong Guo <gch981213@gmail.com>
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Date: Wed, 10 Jul 2019 00:24:48 +0800
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Subject: [PATCH] MIPS: ralink: mt7621: add memory detection support
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mt7621 has the following memory map:
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0x0-0x1c000000: lower 448m memory
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0x1c000000-0x2000000: peripheral registers
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0x20000000-0x2400000: higher 64m memory
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detect_memory_region in arch/mips/kernel/setup.c only add the first
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memory region and isn't suitable for 512m memory detection because
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it may accidentally read the memory area for peripheral registers.
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This commit adds memory detection capability for mt7621:
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1. add the highmem area when 512m is detected.
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2. guard memcmp from accessing peripheral registers:
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This only happens when some weird user decided to change
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kernel load address to 256m or higher address. Since this
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is a quite unusual case, we just skip 512m testing and return
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256m as memory size.
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Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
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---
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arch/mips/include/asm/mach-ralink/mt7621.h | 7 ++---
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arch/mips/ralink/mt7621.c | 30 +++++++++++++++++++---
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2 files changed, 30 insertions(+), 7 deletions(-)
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--- a/arch/mips/include/asm/mach-ralink/mt7621.h
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+++ b/arch/mips/include/asm/mach-ralink/mt7621.h
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@@ -44,9 +44,10 @@
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#define CPU_PLL_FBDIV_MASK 0x7f
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#define CPU_PLL_FBDIV_SHIFT 4
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-#define MT7621_DRAM_BASE 0x0
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-#define MT7621_DDR2_SIZE_MIN 32
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-#define MT7621_DDR2_SIZE_MAX 256
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+#define MT7621_LOWMEM_BASE 0x0
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+#define MT7621_LOWMEM_MAX_SIZE 0x1C000000
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+#define MT7621_HIGHMEM_BASE 0x20000000
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+#define MT7621_HIGHMEM_SIZE 0x4000000
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#define MT7621_CHIP_NAME0 0x3637544D
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#define MT7621_CHIP_NAME1 0x20203132
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--- a/arch/mips/ralink/mt7621.c
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+++ b/arch/mips/ralink/mt7621.c
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@@ -9,11 +9,13 @@
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/sys_soc.h>
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+#include <linux/memblock.h>
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/clk-provider.h>
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#include <dt-bindings/clock/mt7621-clk.h>
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+#include <asm/bootinfo.h>
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#include <asm/mipsregs.h>
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#include <asm/smp-ops.h>
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#include <asm/mips-cps.h>
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@@ -54,6 +56,8 @@
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#define MT7621_GPIO_MODE_SDHCI_SHIFT 18
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#define MT7621_GPIO_MODE_SDHCI_GPIO 1
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+static void *detect_magic __initdata = detect_memory_region;
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+
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static struct rt2880_pmx_func uart1_grp[] = { FUNC("uart1", 0, 1, 2) };
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static struct rt2880_pmx_func i2c_grp[] = { FUNC("i2c", 0, 3, 2) };
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static struct rt2880_pmx_func uart3_grp[] = {
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@@ -138,6 +142,26 @@ static struct clk *__init mt7621_add_sys
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return clk;
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}
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+void __init mt7621_memory_detect(void)
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+{
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+ void *dm = &detect_magic;
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+ phys_addr_t size;
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+
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+ for (size = 32 * SZ_1M; size < 256 * SZ_1M; size <<= 1) {
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+ if (!__builtin_memcmp(dm, dm + size, sizeof(detect_magic)))
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+ break;
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+ }
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+
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+ if ((size == 256 * SZ_1M) &&
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+ (CPHYSADDR(dm + size) < MT7621_LOWMEM_MAX_SIZE) &&
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+ __builtin_memcmp(dm, dm + size, sizeof(detect_magic))) {
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+ memblock_add(MT7621_LOWMEM_BASE, MT7621_LOWMEM_MAX_SIZE);
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+ memblock_add(MT7621_HIGHMEM_BASE, MT7621_HIGHMEM_SIZE);
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+ } else {
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+ memblock_add(MT7621_LOWMEM_BASE, size);
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+ }
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+}
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+
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void __init ralink_clk_init(void)
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{
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u32 syscfg, xtal_sel, clkcfg, clk_sel, curclk, ffiv, ffrac;
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@@ -277,10 +301,7 @@ void prom_soc_init(struct ralink_soc_inf
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(rev >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK,
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(rev & CHIP_REV_ECO_MASK));
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- soc_info->mem_size_min = MT7621_DDR2_SIZE_MIN;
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- soc_info->mem_size_max = MT7621_DDR2_SIZE_MAX;
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- soc_info->mem_base = MT7621_DRAM_BASE;
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-
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+ soc_info->mem_detect = mt7621_memory_detect;
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rt2880_pinmux_data = mt7621_pinmux_data;
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soc_dev_init(soc_info, rev);
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--- a/arch/mips/ralink/common.h
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+++ b/arch/mips/ralink/common.h
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@@ -17,6 +17,7 @@ struct ralink_soc_info {
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unsigned long mem_size;
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unsigned long mem_size_min;
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unsigned long mem_size_max;
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+ void (*mem_detect)(void);
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};
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extern struct ralink_soc_info soc_info;
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--- a/arch/mips/ralink/of.c
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+++ b/arch/mips/ralink/of.c
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@@ -85,6 +85,8 @@ void __init plat_mem_setup(void)
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of_scan_flat_dt(early_init_dt_find_memory, NULL);
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if (memory_dtb)
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of_scan_flat_dt(early_init_dt_scan_memory, NULL);
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+ else if (soc_info.mem_detect)
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+ soc_info.mem_detect();
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else if (soc_info.mem_size)
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memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M);
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else
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