3 files changed, 308 insertions, 0 deletions

diff --git a/Documentation/arm/Samsung/GPIO.txt b/Documentation/arm/Samsung/GPIO.txt
new file mode 100644
index 000000000000..05850c62abeb
--- /dev/null
+++ b/Documentation/arm/Samsung/GPIO.txt
@@ -0,0 +1,42 @@
+                Samsung GPIO implementation
+                ===========================
+
+Introduction
+------------
+
+This outlines the Samsung GPIO implementation and the architecture
+specfic calls provided alongisde the drivers/gpio core.
+
+
+S3C24XX (Legacy)
+----------------
+
+See Documentation/arm/Samsung-S3C24XX/GPIO.txt for more information
+about these devices. Their implementation is being brought into line
+with the core samsung implementation described in this document.
+
+
+GPIOLIB integration
+-------------------
+
+The gpio implementation uses gpiolib as much as possible, only providing
+specific calls for the items that require Samsung specific handling, such
+as pin special-function or pull resistor control.
+
+GPIO numbering is synchronised between the Samsung and gpiolib system.
+
+
+PIN configuration
+-----------------
+
+Pin configuration is specific to the Samsung architecutre, with each SoC
+registering the necessary information for the core gpio configuration
+implementation to configure pins as necessary.
+
+The s3c_gpio_cfgpin() and s3c_gpio_setpull() provide the means for a
+driver or machine to change gpio configuration.
+
+See arch/arm/plat-samsung/include/plat/gpio-cfg.h for more information
+on these functions.
+
+
diff --git a/Documentation/arm/Samsung/Overview.txt b/Documentation/arm/Samsung/Overview.txt
new file mode 100644
index 000000000000..c3094ea51aa7
--- /dev/null
+++ b/Documentation/arm/Samsung/Overview.txt
@@ -0,0 +1,99 @@
+                Samsung ARM Linux Overview
+                ==========================
+
+Introduction
+------------
+
+  The Samsung range of ARM SoCs spans many similar devices, from the initial
+  ARM9 through to the newest ARM cores. This document shows an overview of
+  the current kernel support, how to use it and where to find the code
+  that supports this.
+
+  The currently supported SoCs are:
+
+  - S3C24XX: See Documentation/arm/Samsung-S3C24XX/Overview.txt for full list
+  - S3C64XX: S3C6400 and S3C6410
+  - S5P6440
+  - S5P6442
+  - S5PC100
+  - S5PC110 / S5PV210
+
+
+S3C24XX Systems
+---------------
+
+  There is still documentation in Documnetation/arm/Samsung-S3C24XX/ which
+  deals with the architecture and drivers specific to these devices.
+
+  See Documentation/arm/Samsung-S3C24XX/Overview.txt for more information
+  on the implementation details and specific support.
+
+
+Configuration
+-------------
+
+  A number of configurations are supplied, as there is no current way of
+  unifying all the SoCs into one kernel.
+
+  s5p6440_defconfig - S5P6440 specific default configuration
+  s5p6442_defconfig - S5P6442 specific default configuration
+  s5pc100_defconfig - S5PC100 specific default configuration
+  s5pc110_defconfig - S5PC110 specific default configuration
+  s5pv210_defconfig - S5PV210 specific default configuration
+
+
+Layout
+------
+
+  The directory layout is currently being restructured, and consists of
+  several platform directories and then the machine specific directories
+  of the CPUs being built for.
+
+  plat-samsung provides the base for all the implementations, and is the
+  last in the line of include directories that are processed for the build
+  specific information. It contains the base clock, GPIO and device definitions
+  to get the system running.
+
+  plat-s3c24xx is for s3c24xx specific builds, see the S3C24XX docs.
+
+  plat-s5p is for s5p specific builds, and contains common support for the
+  S5P specific systems. Not all S5Ps use all the features in this directory
+  due to differences in the hardware.
+
+
+Layout changes
+--------------
+
+  The old plat-s3c and plat-s5pc1xx directories have been removed, with
+  support moved to either plat-samsung or plat-s5p as necessary. These moves
+  where to simplify the include and dependency issues involved with having
+  so many different platform directories.
+
+  It was decided to remove plat-s5pc1xx as some of the support was already
+  in plat-s5p or plat-samsung, with the S5PC110 support added with S5PV210
+  the only user was the S5PC100. The S5PC100 specific items where moved to
+  arch/arm/mach-s5pc100.
+
+
+
+
+Port Contributors
+-----------------
+
+  Ben Dooks (BJD)
+  Vincent Sanders
+  Herbert Potzl
+  Arnaud Patard (RTP)
+  Roc Wu
+  Klaus Fetscher
+  Dimitry Andric
+  Shannon Holland
+  Guillaume Gourat (NexVision)
+  Christer Weinigel (wingel) (Acer N30)
+  Lucas Correia Villa Real (S3C2400 port)
+
+
+Document Author
+---------------
+
+Copyright 2009-2010 Ben Dooks <ben-linux@fluff.org>
diff --git a/Documentation/arm/Samsung/clksrc-change-registers.awk b/Documentation/arm/Samsung/clksrc-change-registers.awk
new file mode 100755
index 000000000000..0c50220851fb
--- /dev/null
+++ b/Documentation/arm/Samsung/clksrc-change-registers.awk
@@ -0,0 +1,167 @@
+#!/usr/bin/awk -f
+#
+# Copyright 2010 Ben Dooks <ben-linux@fluff.org>
+#
+# Released under GPLv2
+
+# example usage
+# ./clksrc-change-registers.awk arch/arm/plat-s5pc1xx/include/plat/regs-clock.h < src > dst
+
+function extract_value(s)
+{
+    eqat = index(s, "=")
+    comat = index(s, ",")
+    return substr(s, eqat+2, (comat-eqat)-2)
+}
+
+function remove_brackets(b)
+{
+    return substr(b, 2, length(b)-2)
+}
+
+function splitdefine(l, p)
+{
+    r = split(l, tp)
+
+    p[0] = tp[2]
+    p[1] = remove_brackets(tp[3])
+}
+
+function find_length(f)
+{
+    if (0)
+        printf "find_length " f "\n" > "/dev/stderr"
+
+    if (f ~ /0x1/)
+        return 1
+    else if (f ~ /0x3/)
+        return 2
+    else if (f ~ /0x7/)
+        return 3
+    else if (f ~ /0xf/)
+        return 4
+
+    printf "unknown legnth " f "\n" > "/dev/stderr"
+    exit
+}
+
+function find_shift(s)
+{
+    id = index(s, "<")
+    if (id <= 0) {
+        printf "cannot find shift " s "\n" > "/dev/stderr"
+        exit
+    }
+
+    return substr(s, id+2)
+}
+
+
+BEGIN {
+    if (ARGC < 2) {
+        print "too few arguments" > "/dev/stderr"
+        exit
+    }
+
+# read the header file and find the mask values that we will need
+# to replace and create an associative array of values
+
+    while (getline line < ARGV[1] > 0) {
+        if (line ~ /\#define.*_MASK/ &&
+            !(line ~ /S5PC100_EPLL_MASK/) &&
+            !(line ~ /USB_SIG_MASK/)) {
+            splitdefine(line, fields)
+            name = fields[0]
+            if (0)
+                printf "MASK " line "\n" > "/dev/stderr"
+            dmask[name,0] = find_length(fields[1])
+            dmask[name,1] = find_shift(fields[1])
+            if (0)
+                printf "=> '" name "' LENGTH=" dmask[name,0] " SHIFT=" dmask[name,1] "\n" > "/dev/stderr"
+        } else {
+        }
+    }
+
+    delete ARGV[1]
+}
+
+/clksrc_clk.*=.*{/ {
+    shift=""
+    mask=""
+    divshift=""
+    reg_div=""
+    reg_src=""
+    indent=1
+
+    print $0
+
+    for(; indent >= 1;) {
+        if ((getline line) <= 0) {
+            printf "unexpected end of file" > "/dev/stderr"
+            exit 1;
+        }
+
+        if (line ~ /\.shift/) {
+            shift = extract_value(line)
+        } else if (line ~ /\.mask/) {
+            mask = extract_value(line)
+        } else if (line ~ /\.reg_divider/) {
+            reg_div = extract_value(line)
+        } else if (line ~ /\.reg_source/) {
+            reg_src = extract_value(line)
+        } else if (line ~ /\.divider_shift/) {
+            divshift = extract_value(line)
+        } else if (line ~ /{/) {
+                indent++
+                print line
+            } else if (line ~ /}/) {
+            indent--
+
+            if (indent == 0) {
+                if (0) {
+                    printf "shift '" shift   "' ='" dmask[shift,0] "'\n" > "/dev/stderr"
+                    printf "mask  '" mask    "'\n" > "/dev/stderr"
+                    printf "dshft '" divshift "'\n" > "/dev/stderr"
+                    printf "rdiv  '" reg_div "'\n" > "/dev/stderr"
+                    printf "rsrc  '" reg_src "'\n" > "/dev/stderr"
+                }
+
+                generated = mask
+                sub(reg_src, reg_div, generated)
+
+                if (0) {
+                    printf "/* rsrc " reg_src " */\n"
+                    printf "/* rdiv " reg_div " */\n"
+                    printf "/* shift " shift " */\n"
+                    printf "/* mask " mask " */\n"
+                    printf "/* generated " generated " */\n"
+                }
+
+                if (reg_div != "") {
+                    printf "\t.reg_div = { "
+                    printf ".reg = " reg_div ", "
+                    printf ".shift = " dmask[generated,1] ", "
+                    printf ".size = " dmask[generated,0] ", "
+                    printf "},\n"
+                }
+
+                printf "\t.reg_src = { "
+                printf ".reg = " reg_src ", "
+                printf ".shift = " dmask[mask,1] ", "
+                printf ".size = " dmask[mask,0] ", "
+
+                printf "},\n"
+
+            }
+
+            print line
+        } else {
+            print line
+        }
+
+        if (0)
+            printf indent ":" line "\n" > "/dev/stderr"
+    }
+}
+
+// && ! /clksrc_clk.*=.*{/ { print $0 }