diff options
Diffstat (limited to 'arch/arm/plat-s3c24xx')
| -rw-r--r-- | arch/arm/plat-s3c24xx/Makefile | 3 | ||||
| -rw-r--r-- | arch/arm/plat-s3c24xx/neo1973_memconfig.c | 186 |
2 files changed, 188 insertions, 1 deletions
diff --git a/arch/arm/plat-s3c24xx/Makefile b/arch/arm/plat-s3c24xx/Makefile index 0a56561a975..fafd153374f 100644 --- a/arch/arm/plat-s3c24xx/Makefile +++ b/arch/arm/plat-s3c24xx/Makefile @@ -49,4 +49,5 @@ 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 00000000000..55d85fc7a1e --- /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"); + |