Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | S3C24XX ARM Linux Overview |
| 2 | ========================== |
| 3 | |
| 4 | |
| 5 | |
| 6 | Introduction |
| 7 | ------------ |
| 8 | |
| 9 | The Samsung S3C24XX range of ARM9 System-on-Chip CPUs are supported |
Ben Dooks | f964c30 | 2006-06-26 22:51:08 +0100 | [diff] [blame] | 10 | by the 's3c2410' architecture of ARM Linux. Currently the S3C2410, |
| 11 | S3C2440 and S3C2442 devices are supported. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | |
Ben Dooks | a08ceff | 2006-03-20 17:10:07 +0000 | [diff] [blame] | 13 | Support for the S3C2400 series is in progress. |
| 14 | |
Ben Dooks | f964c30 | 2006-06-26 22:51:08 +0100 | [diff] [blame] | 15 | Support for the S3C2412 and S3C2413 CPUs is being merged. |
| 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | Configuration |
| 19 | ------------- |
| 20 | |
| 21 | A generic S3C2410 configuration is provided, and can be used as the |
| 22 | default by `make s3c2410_defconfig`. This configuration has support |
| 23 | for all the machines, and the commonly used features on them. |
| 24 | |
| 25 | Certain machines may have their own default configurations as well, |
| 26 | please check the machine specific documentation. |
| 27 | |
| 28 | |
| 29 | Machines |
| 30 | -------- |
| 31 | |
| 32 | The currently supported machines are as follows: |
| 33 | |
| 34 | Simtec Electronics EB2410ITX (BAST) |
| 35 | |
| 36 | A general purpose development board, see EB2410ITX.txt for further |
| 37 | details |
| 38 | |
Ben Dooks | a08ceff | 2006-03-20 17:10:07 +0000 | [diff] [blame] | 39 | Simtec Electronics IM2440D20 (Osiris) |
| 40 | |
| 41 | CPU Module from Simtec Electronics, with a S3C2440A CPU, nand flash |
| 42 | and a PCMCIA controller. |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | Samsung SMDK2410 |
| 45 | |
| 46 | Samsung's own development board, geared for PDA work. |
| 47 | |
Ben Dooks | f964c30 | 2006-06-26 22:51:08 +0100 | [diff] [blame] | 48 | Samsung/Aiji SMDK2412 |
| 49 | |
| 50 | The S3C2412 version of the SMDK2440. |
| 51 | |
| 52 | Samsung/Aiji SMDK2413 |
| 53 | |
| 54 | The S3C2412 version of the SMDK2440. |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | Samsung/Meritech SMDK2440 |
| 57 | |
Ben Dooks | f964c30 | 2006-06-26 22:51:08 +0100 | [diff] [blame] | 58 | The S3C2440 compatible version of the SMDK2440, which has the |
| 59 | option of an S3C2440 or S3C2442 CPU module. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 61 | Thorcom VR1000 |
| 62 | |
| 63 | Custom embedded board |
| 64 | |
| 65 | HP IPAQ 1940 |
| 66 | |
| 67 | Handheld (IPAQ), available in several varieties |
| 68 | |
| 69 | HP iPAQ rx3715 |
| 70 | |
| 71 | S3C2440 based IPAQ, with a number of variations depending on |
| 72 | features shipped. |
| 73 | |
| 74 | Acer N30 |
| 75 | |
| 76 | A S3C2410 based PDA from Acer. There is a Wiki page at |
| 77 | http://handhelds.org/moin/moin.cgi/AcerN30Documentation . |
| 78 | |
| 79 | |
| 80 | Adding New Machines |
| 81 | ------------------- |
| 82 | |
Matt LaPlante | 3f6dee9 | 2006-10-03 22:45:33 +0200 | [diff] [blame] | 83 | The architecture has been designed to support as many machines as can |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | be configured for it in one kernel build, and any future additions |
| 85 | should keep this in mind before altering items outside of their own |
| 86 | machine files. |
| 87 | |
| 88 | Machine definitions should be kept in linux/arch/arm/mach-s3c2410, |
| 89 | and there are a number of examples that can be looked at. |
| 90 | |
| 91 | Read the kernel patch submission policies as well as the |
| 92 | Documentation/arm directory before submitting patches. The |
| 93 | ARM kernel series is managed by Russell King, and has a patch system |
| 94 | located at http://www.arm.linux.org.uk/developer/patches/ |
| 95 | as well as mailing lists that can be found from the same site. |
| 96 | |
| 97 | As a courtesy, please notify <ben-linux@fluff.org> of any new |
| 98 | machines or other modifications. |
| 99 | |
| 100 | Any large scale modifications, or new drivers should be discussed |
| 101 | on the ARM kernel mailing list (linux-arm-kernel) before being |
Ben Dooks | 6ff8f59 | 2005-11-01 19:44:29 +0000 | [diff] [blame] | 102 | attempted. See http://www.arm.linux.org.uk/mailinglists/ for the |
| 103 | mailing list information. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
| 105 | |
Ben Dooks | a08ceff | 2006-03-20 17:10:07 +0000 | [diff] [blame] | 106 | I2C |
| 107 | --- |
| 108 | |
| 109 | The hardware I2C core in the CPU is supported in single master |
| 110 | mode, and can be configured via platform data. |
| 111 | |
| 112 | |
| 113 | RTC |
| 114 | --- |
| 115 | |
| 116 | Support for the onboard RTC unit, including alarm function. |
| 117 | |
| 118 | |
| 119 | Watchdog |
| 120 | -------- |
| 121 | |
| 122 | The onchip watchdog is available via the standard watchdog |
| 123 | interface. |
| 124 | |
| 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | NAND |
| 127 | ---- |
| 128 | |
| 129 | The current kernels now have support for the s3c2410 NAND |
| 130 | controller. If there are any problems the latest linux-mtd |
| 131 | CVS can be found from http://www.linux-mtd.infradead.org/ |
| 132 | |
| 133 | |
| 134 | Serial |
| 135 | ------ |
| 136 | |
| 137 | The s3c2410 serial driver provides support for the internal |
| 138 | serial ports. These devices appear as /dev/ttySAC0 through 3. |
| 139 | |
| 140 | To create device nodes for these, use the following commands |
| 141 | |
| 142 | mknod ttySAC0 c 204 64 |
| 143 | mknod ttySAC1 c 204 65 |
| 144 | mknod ttySAC2 c 204 66 |
| 145 | |
| 146 | |
| 147 | GPIO |
| 148 | ---- |
| 149 | |
| 150 | The core contains support for manipulating the GPIO, see the |
| 151 | documentation in GPIO.txt in the same directory as this file. |
| 152 | |
| 153 | |
| 154 | Clock Management |
| 155 | ---------------- |
| 156 | |
| 157 | The core provides the interface defined in the header file |
| 158 | include/asm-arm/hardware/clock.h, to allow control over the |
| 159 | various clock units |
| 160 | |
| 161 | |
Ben Dooks | a08ceff | 2006-03-20 17:10:07 +0000 | [diff] [blame] | 162 | Suspend to RAM |
| 163 | -------------- |
| 164 | |
| 165 | For boards that provide support for suspend to RAM, the |
| 166 | system can be placed into low power suspend. |
| 167 | |
| 168 | See Suspend.txt for more information. |
| 169 | |
| 170 | |
Ben Dooks | 6ff8f59 | 2005-11-01 19:44:29 +0000 | [diff] [blame] | 171 | Platform Data |
| 172 | ------------- |
| 173 | |
| 174 | Whenever a device has platform specific data that is specified |
| 175 | on a per-machine basis, care should be taken to ensure the |
| 176 | following: |
| 177 | |
| 178 | 1) that default data is not left in the device to confuse the |
| 179 | driver if a machine does not set it at startup |
| 180 | |
| 181 | 2) the data should (if possible) be marked as __initdata, |
| 182 | to ensure that the data is thrown away if the machine is |
| 183 | not the one currently in use. |
| 184 | |
| 185 | The best way of doing this is to make a function that |
| 186 | kmalloc()s an area of memory, and copies the __initdata |
| 187 | and then sets the relevant device's platform data. Making |
| 188 | the function `__init` takes care of ensuring it is discarded |
| 189 | with the rest of the initialisation code |
| 190 | |
| 191 | static __init void s3c24xx_xxx_set_platdata(struct xxx_data *pd) |
| 192 | { |
| 193 | struct s3c2410_xxx_mach_info *npd; |
| 194 | |
| 195 | npd = kmalloc(sizeof(struct s3c2410_xxx_mach_info), GFP_KERNEL); |
| 196 | if (npd) { |
| 197 | memcpy(npd, pd, sizeof(struct s3c2410_xxx_mach_info)); |
| 198 | s3c_device_xxx.dev.platform_data = npd; |
| 199 | } else { |
| 200 | printk(KERN_ERR "no memory for xxx platform data\n"); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | Note, since the code is marked as __init, it should not be |
| 205 | exported outside arch/arm/mach-s3c2410/, or exported to |
| 206 | modules via EXPORT_SYMBOL() and related functions. |
| 207 | |
Ben Dooks | a08ceff | 2006-03-20 17:10:07 +0000 | [diff] [blame] | 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | Port Contributors |
| 210 | ----------------- |
| 211 | |
| 212 | Ben Dooks (BJD) |
| 213 | Vincent Sanders |
| 214 | Herbert Potzl |
| 215 | Arnaud Patard (RTP) |
| 216 | Roc Wu |
| 217 | Klaus Fetscher |
| 218 | Dimitry Andric |
| 219 | Shannon Holland |
| 220 | Guillaume Gourat (NexVision) |
| 221 | Christer Weinigel (wingel) (Acer N30) |
| 222 | Lucas Correia Villa Real (S3C2400 port) |
| 223 | |
| 224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | Document Author |
| 226 | --------------- |
| 227 | |
Ben Dooks | a08ceff | 2006-03-20 17:10:07 +0000 | [diff] [blame] | 228 | Ben Dooks, (c) 2004-2005,2006 Simtec Electronics |