mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-27 23:43:01 +02:00
fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
301 lines
8.7 KiB
Diff
301 lines
8.7 KiB
Diff
From fd25f90517322fc6c07bfb8d34752d3cb41cb4b6 Mon Sep 17 00:00:00 2001
|
|
From: Andy Green <andy@openmoko.com>
|
|
Date: Tue, 15 Jul 2008 09:04:11 +0100
|
|
Subject: [PATCH] introduce-BANKCON-meddling-sysfs.patch
|
|
|
|
A few questions have been flying around about how optimal
|
|
our waitstates are for various things including Glamo.
|
|
|
|
This patch introduces new sysfs nodes
|
|
|
|
/sys/devices/platform/neo1973-memconfig.0/BANKCON0
|
|
...
|
|
/sys/devices/platform/neo1973-memconfig.0/BANKCON7
|
|
|
|
If you cat them you get translated info about bus speed on
|
|
that chip select, eg,
|
|
|
|
# cat /sys/devices/platform/neo1973-memconfig.0/BANKCON1
|
|
BANKCON1 = 0x00000A40
|
|
Type = ROM / SRAM
|
|
PMC = normal (1 data)
|
|
Tacp = 2 clocks
|
|
Tcah = 0 clocks
|
|
Tcoh = 1 clock
|
|
Tacc = 3 clocks
|
|
Tcos = 1 clock
|
|
Tacs = 0 clocks
|
|
|
|
You can write them in hex too
|
|
|
|
# echo 0x200 > /sys/devices/platform/neo1973-memconfig.0/BANKCON1
|
|
|
|
The write format for BANKCON0 - 5 looks like this
|
|
|
|
b1..b0 PMC Page Mode Config
|
|
b3..b2 Tacp Page Mode Access Cycle
|
|
b5..b4 Tcah Address hold after CS deasserted
|
|
b7..b6 Tcoh CS hold after OE deasserted
|
|
b10..b8 Tacc Access Cycle Period
|
|
b12..b11 Tcos CS setup before OE asserted
|
|
b14..b13 Tacs Address setup before CS asserted
|
|
|
|
BANKCON 6 and 7 have two extra bits
|
|
|
|
b16..b15 MT Memory type (00=ROM/SRAM, 11=DRAM)
|
|
|
|
If it's ROM/SRAM, the rest of the bits are as described above.
|
|
For DRAM
|
|
|
|
b1..b0 SCAN Column address number
|
|
b3..b2 RAS to CAS delay
|
|
|
|
The patch is intended to let people experiement on their own. But
|
|
of course you will crash things for sure if the timing is wrong, and
|
|
you can also trash SD Card data if you make Glamo unstable, so remove
|
|
it or remount ro first. Other horrible things are possible, but
|
|
because the settings aren't sticky, you should always be able to
|
|
recover by either normal reboot usually or at worst NOR boot and then
|
|
dfu. Most likely you will just crash your session and have to reboot
|
|
if your settings are bad, but consider yourself warned bad things are
|
|
possible. :-)
|
|
|
|
Signed-off-by: Andy Green <andy@openmoko.com>
|
|
---
|
|
arch/arm/mach-s3c2440/mach-gta02.c | 6 +
|
|
arch/arm/plat-s3c24xx/Makefile | 3 +-
|
|
arch/arm/plat-s3c24xx/neo1973_memconfig.c | 186 +++++++++++++++++++++++++++++
|
|
3 files changed, 194 insertions(+), 1 deletions(-)
|
|
create mode 100644 arch/arm/plat-s3c24xx/neo1973_memconfig.c
|
|
|
|
diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
|
|
index b3d3797..f30abb6 100644
|
|
--- a/arch/arm/mach-s3c2440/mach-gta02.c
|
|
+++ b/arch/arm/mach-s3c2440/mach-gta02.c
|
|
@@ -412,6 +412,11 @@ struct platform_device gta02_resume_reason_device = {
|
|
.num_resources = 0,
|
|
};
|
|
|
|
+struct platform_device gta02_memconfig_device = {
|
|
+ .name = "neo1973-memconfig",
|
|
+ .num_resources = 0,
|
|
+};
|
|
+
|
|
static struct map_desc gta02_iodesc[] __initdata = {
|
|
{
|
|
.virtual = 0xe0000000,
|
|
@@ -829,6 +834,7 @@ static struct platform_device *gta02_devices[] __initdata = {
|
|
>a02_nor_flash,
|
|
&sc32440_fiq_device,
|
|
>a02_version_device,
|
|
+ >a02_memconfig_device,
|
|
>a02_resume_reason_device,
|
|
&s3c24xx_pwm_device,
|
|
|
|
diff --git a/arch/arm/plat-s3c24xx/Makefile b/arch/arm/plat-s3c24xx/Makefile
|
|
index 21f5159..d638fc0 100644
|
|
--- a/arch/arm/plat-s3c24xx/Makefile
|
|
+++ b/arch/arm/plat-s3c24xx/Makefile
|
|
@@ -34,4 +34,5 @@ obj-$(CONFIG_MACH_NEO1973) += neo1973_version.o \
|
|
neo1973_pm_gps.o \
|
|
neo1973_pm_bt.o \
|
|
neo1973_shadow.o \
|
|
- neo1973_pm_resume_reason.o
|
|
+ neo1973_pm_resume_reason.o \
|
|
+ neo1973_memconfig.o
|
|
diff --git a/arch/arm/plat-s3c24xx/neo1973_memconfig.c b/arch/arm/plat-s3c24xx/neo1973_memconfig.c
|
|
new file mode 100644
|
|
index 0000000..55d85fc
|
|
--- /dev/null
|
|
+++ b/arch/arm/plat-s3c24xx/neo1973_memconfig.c
|
|
@@ -0,0 +1,186 @@
|
|
+/*
|
|
+ * Memory access timing control sysfs for the s3c24xx based device
|
|
+ *
|
|
+ * (C) 2008 by Openmoko Inc.
|
|
+ * Author: Andy Green <andy@openmoko.com>
|
|
+ * All rights reserved.
|
|
+ *
|
|
+ * This program is free software; you can redistribute it and/or modify
|
|
+ * it under the terms of the GNU General Public License version 2 as
|
|
+ * published by the Free Software Foundation
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/module.h>
|
|
+#include <linux/init.h>
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/platform_device.h>
|
|
+
|
|
+#include <asm/hardware.h>
|
|
+#include <asm/mach-types.h>
|
|
+#include <asm/arch/regs-mem.h>
|
|
+
|
|
+static ssize_t neo1973_memconfig_read(struct device *dev,
|
|
+ struct device_attribute *attr, char *buf)
|
|
+{
|
|
+ int index = attr->attr.name[strlen(attr->attr.name) - 1] - '0';
|
|
+ u32 reg = *((u32 *)(S3C2410_MEMREG(((index + 1) << 2))));
|
|
+ static const char *meaning[][8] = {
|
|
+ {
|
|
+ [0] = "normal (1 data)",
|
|
+ [1] = "4 data",
|
|
+ [2] = "8 data",
|
|
+ [3] = "16 data",
|
|
+ }, {
|
|
+ [0] = "2 clocks",
|
|
+ [1] = "3 clocks",
|
|
+ [2] = "4 clocks",
|
|
+ [3] = "6 clocks",
|
|
+ }, {
|
|
+ [0] = "0 clocks",
|
|
+ [1] = "1 clock",
|
|
+ [2] = "2 clocks",
|
|
+ [3] = "4 clocks",
|
|
+ }, {
|
|
+ [0] = "1 clock",
|
|
+ [1] = "2 clocks",
|
|
+ [2] = "3 clocks",
|
|
+ [3] = "4 clocks",
|
|
+ [4] = "6 clocks",
|
|
+ [5] = "8 clocks",
|
|
+ [6] = "10 clocks",
|
|
+ [7] = "14 clocks",
|
|
+ }, { /* after this, only for CS6 and CS7 */
|
|
+ [0] = "ROM / SRAM",
|
|
+ [1] = "(illegal)",
|
|
+ [2] = "(illegal)",
|
|
+ [3] = "Sync DRAM",
|
|
+ }, {
|
|
+ [0] = "8 Column bits",
|
|
+ [1] = "9 Column bits",
|
|
+ [2] = "10 Column bits",
|
|
+ [3] = "(illegal)",
|
|
+ }, {
|
|
+ [0] = "2 clocks",
|
|
+ [1] = "3 clocks",
|
|
+ [2] = "4 clocks",
|
|
+ [3] = "(illegal)",
|
|
+ }
|
|
+ };
|
|
+
|
|
+ if (index >= 6)
|
|
+ if (((reg >> 15) & 3) == 3) /* DRAM */
|
|
+ return sprintf(buf, "BANKCON%d = 0x%08X\n DRAM:\n"
|
|
+ " Trcd = %s\n SCAN = %s\n", index,
|
|
+ reg, meaning[5][reg & 3],
|
|
+ meaning[1][(reg >> 2) & 3]);
|
|
+
|
|
+ return sprintf(buf, "BANKCON%d = 0x%08X\n Type = %s\n PMC = %s\n"
|
|
+ " Tacp = %s\n Tcah = %s\n Tcoh = %s\n Tacc = %s\n"
|
|
+ " Tcos = %s\n Tacs = %s\n",
|
|
+ index, reg, meaning[4][(reg >> 15) & 3],
|
|
+ meaning[0][reg & 3],
|
|
+ meaning[1][(reg >> 2) & 3],
|
|
+ meaning[2][(reg >> 4) & 3],
|
|
+ meaning[2][(reg >> 6) & 3],
|
|
+ meaning[3][(reg >> 8) & 7],
|
|
+ meaning[2][(reg >> 11) & 3],
|
|
+ meaning[2][(reg >> 13) & 3]);
|
|
+}
|
|
+
|
|
+static ssize_t neo1973_memconfig_write(struct device *dev,
|
|
+ struct device_attribute *attr, const char *buf, size_t count)
|
|
+{
|
|
+ int index = attr->attr.name[strlen(attr->attr.name) - 1] - '0';
|
|
+ unsigned long val = simple_strtoul(buf, NULL, 16);
|
|
+
|
|
+ dev_info(dev, "setting BANKCON%d <- 0x%08X\n", index, (u32)val);
|
|
+
|
|
+ *((u32 *)(S3C2410_MEMREG(((index + 1) << 2)))) = (u32)val;
|
|
+
|
|
+ return count;
|
|
+}
|
|
+
|
|
+
|
|
+static DEVICE_ATTR(BANKCON0, 0644, neo1973_memconfig_read,
|
|
+ neo1973_memconfig_write);
|
|
+static DEVICE_ATTR(BANKCON1, 0644, neo1973_memconfig_read,
|
|
+ neo1973_memconfig_write);
|
|
+static DEVICE_ATTR(BANKCON2, 0644, neo1973_memconfig_read,
|
|
+ neo1973_memconfig_write);
|
|
+static DEVICE_ATTR(BANKCON3, 0644, neo1973_memconfig_read,
|
|
+ neo1973_memconfig_write);
|
|
+static DEVICE_ATTR(BANKCON4, 0644, neo1973_memconfig_read,
|
|
+ neo1973_memconfig_write);
|
|
+static DEVICE_ATTR(BANKCON5, 0644, neo1973_memconfig_read,
|
|
+ neo1973_memconfig_write);
|
|
+static DEVICE_ATTR(BANKCON6, 0644, neo1973_memconfig_read,
|
|
+ neo1973_memconfig_write);
|
|
+static DEVICE_ATTR(BANKCON7, 0644, neo1973_memconfig_read,
|
|
+ neo1973_memconfig_write);
|
|
+
|
|
+static struct attribute *neo1973_memconfig_sysfs_entries[] = {
|
|
+ &dev_attr_BANKCON0.attr,
|
|
+ &dev_attr_BANKCON1.attr,
|
|
+ &dev_attr_BANKCON2.attr,
|
|
+ &dev_attr_BANKCON3.attr,
|
|
+ &dev_attr_BANKCON4.attr,
|
|
+ &dev_attr_BANKCON5.attr,
|
|
+ &dev_attr_BANKCON6.attr,
|
|
+ &dev_attr_BANKCON7.attr,
|
|
+ NULL
|
|
+};
|
|
+
|
|
+static struct attribute_group neo1973_memconfig_attr_group = {
|
|
+ .name = NULL,
|
|
+ .attrs = neo1973_memconfig_sysfs_entries,
|
|
+};
|
|
+
|
|
+static int __init neo1973_memconfig_probe(struct platform_device *pdev)
|
|
+{
|
|
+ dev_info(&pdev->dev, "starting\n");
|
|
+
|
|
+ switch (machine_arch_type) {
|
|
+#ifdef CONFIG_MACH_NEO1973_GTA01
|
|
+ case MACH_TYPE_NEO1973_GTA01:
|
|
+ return -EINVAL;
|
|
+#endif /* CONFIG_MACH_NEO1973_GTA01 */
|
|
+ default:
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ return sysfs_create_group(&pdev->dev.kobj,
|
|
+ &neo1973_memconfig_attr_group);
|
|
+}
|
|
+
|
|
+static int neo1973_memconfig_remove(struct platform_device *pdev)
|
|
+{
|
|
+ sysfs_remove_group(&pdev->dev.kobj, &neo1973_memconfig_attr_group);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct platform_driver neo1973_memconfig_driver = {
|
|
+ .probe = neo1973_memconfig_probe,
|
|
+ .remove = neo1973_memconfig_remove,
|
|
+ .driver = {
|
|
+ .name = "neo1973-memconfig",
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __devinit neo1973_memconfig_init(void)
|
|
+{
|
|
+ return platform_driver_register(&neo1973_memconfig_driver);
|
|
+}
|
|
+
|
|
+static void neo1973_memconfig_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&neo1973_memconfig_driver);
|
|
+}
|
|
+
|
|
+module_init(neo1973_memconfig_init);
|
|
+module_exit(neo1973_memconfig_exit);
|
|
+
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
|
|
+MODULE_DESCRIPTION("neo1973 memconfig");
|
|
+
|
|
--
|
|
1.5.6.5
|
|
|