diff options
Diffstat (limited to 'target/linux/s3c24xx/patches-2.6.26/1212-introduce-BANKCON-meddling-sysfs.patch.patch')
| -rwxr-xr-x | target/linux/s3c24xx/patches-2.6.26/1212-introduce-BANKCON-meddling-sysfs.patch.patch | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/patches-2.6.26/1212-introduce-BANKCON-meddling-sysfs.patch.patch b/target/linux/s3c24xx/patches-2.6.26/1212-introduce-BANKCON-meddling-sysfs.patch.patch new file mode 100755 index 0000000000..207512e612 --- /dev/null +++ b/target/linux/s3c24xx/patches-2.6.26/1212-introduce-BANKCON-meddling-sysfs.patch.patch @@ -0,0 +1,300 @@ +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 + |