+++ /dev/null
-From 3db422fde610960fdca8bd2a2b882015a62860ca Mon Sep 17 00:00:00 2001
-From: Andy Green <andy@openmoko.com>
-Date: Fri, 25 Jul 2008 23:06:20 +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 f60dc5f..baae831 100644
---- a/arch/arm/plat-s3c24xx/Makefile
-+++ b/arch/arm/plat-s3c24xx/Makefile
-@@ -35,4 +35,5 @@ 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");
-+
---
-1.5.6.3
-
projects / openwrt / openwrt.git / blobdiff