€•ßI      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ /translations/zh_CN/arch/arm/tcm”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ /translations/zh_TW/arch/arm/tcm”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ /translations/it_IT/arch/arm/tcm”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ /translations/ja_JP/arch/arm/tcm”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ /translations/ko_KR/arch/arm/tcm”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ /translations/sp_SP/arch/arm/tcm”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒ2ARM TCM (Tightly-Coupled Memory) handling in Linux”h]”hŒ2ARM TCM (Tightly-Coupled Memory) handling in Linux”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒ:/var/lib/git/docbuild/linux/Documentation/arch/arm/tcm.rst”h KubhŒ	paragraph”“”)”}”(hŒ7Written by Linus Walleij <linus.walleij@stericsson.com>”h]”(hŒWritten by Linus Walleij <”…””}”(hh¹hžhhŸNh NubhŒ	reference”“”)”}”(hŒlinus.walleij@stericsson.com”h]”hŒlinus.walleij@stericsson.com”…””}”(hhÃhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œ#mailto:linus.walleij@stericsson.com”uh1hÁhh¹ubhŒ>”…””}”(hh¹hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hŒƒSome ARM SoCs have a so-called TCM (Tightly-Coupled Memory).
This is usually just a few (4-64) KiB of RAM inside the ARM
processor.”h]”hŒƒSome ARM SoCs have a so-called TCM (Tightly-Coupled Memory).
This is usually just a few (4-64) KiB of RAM inside the ARM
processor.”…””}”(hhÝhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hXC  Due to being embedded inside the CPU, the TCM has a
Harvard-architecture, so there is an ITCM (instruction TCM)
and a DTCM (data TCM). The DTCM can not contain any
instructions, but the ITCM can actually contain data.
The size of DTCM or ITCM is minimum 4KiB so the typical
minimum configuration is 4KiB ITCM and 4KiB DTCM.”h]”hXC  Due to being embedded inside the CPU, the TCM has a
Harvard-architecture, so there is an ITCM (instruction TCM)
and a DTCM (data TCM). The DTCM can not contain any
instructions, but the ITCM can actually contain data.
The size of DTCM or ITCM is minimum 4KiB so the typical
minimum configuration is 4KiB ITCM and 4KiB DTCM.”…””}”(hhëhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hXÆ  ARM CPUs have special registers to read out status, physical
location and size of TCM memories. arch/arm/include/asm/cputype.h
defines a CPUID_TCM register that you can read out from the
system control coprocessor. Documentation from ARM can be found
at http://infocenter.arm.com, search for "TCM Status Register"
to see documents for all CPUs. Reading this register you can
determine if ITCM (bits 1-0) and/or DTCM (bit 17-16) is present
in the machine.”h]”(hŒþARM CPUs have special registers to read out status, physical
location and size of TCM memories. arch/arm/include/asm/cputype.h
defines a CPUID_TCM register that you can read out from the
system control coprocessor. Documentation from ARM can be found
at ”…””}”(hhùhžhhŸNh NubhÂ)”}”(hŒhttp://infocenter.arm.com”h]”hŒhttp://infocenter.arm.com”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”j  uh1hÁhhùubhŒ³, search for â€œTCM Status Registerâ€
to see documents for all CPUs. Reading this register you can
determine if ITCM (bits 1-0) and/or DTCM (bit 17-16) is present
in the machine.”…””}”(hhùhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hXÈ  There is further a TCM region register (search for "TCM Region
Registers" at the ARM site) that can report and modify the location
size of TCM memories at runtime. This is used to read out and modify
TCM location and size. Notice that this is not a MMU table: you
actually move the physical location of the TCM around. At the
place you put it, it will mask any underlying RAM from the
CPU so it is usually wise not to overlap any physical RAM with
the TCM.”h]”hXÌ  There is further a TCM region register (search for â€œTCM Region
Registersâ€ at the ARM site) that can report and modify the location
size of TCM memories at runtime. This is used to read out and modify
TCM location and size. Notice that this is not a MMU table: you
actually move the physical location of the TCM around. At the
place you put it, it will mask any underlying RAM from the
CPU so it is usually wise not to overlap any physical RAM with
the TCM.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hX½  The TCM memory can then be remapped to another address again using
the MMU, but notice that the TCM is often used in situations where
the MMU is turned off. To avoid confusion the current Linux
implementation will map the TCM 1 to 1 from physical to virtual
memory in the location specified by the kernel. Currently Linux
will map ITCM to 0xfffe0000 and on, and DTCM to 0xfffe8000 and
on, supporting a maximum of 32KiB of ITCM and 32KiB of DTCM.”h]”hX½  The TCM memory can then be remapped to another address again using
the MMU, but notice that the TCM is often used in situations where
the MMU is turned off. To avoid confusion the current Linux
implementation will map the TCM 1 to 1 from physical to virtual
memory in the location specified by the kernel. Currently Linux
will map ITCM to 0xfffe0000 and on, and DTCM to 0xfffe8000 and
on, supporting a maximum of 32KiB of ITCM and 32KiB of DTCM.”…””}”(hj(  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K$hh£hžhubh¸)”}”(hX  Newer versions of the region registers also support dividing these
TCMs in two separate banks, so for example an 8KiB ITCM is divided
into two 4KiB banks with its own control registers. The idea is to
be able to lock and hide one of the banks for use by the secure
world (TrustZone).”h]”hX  Newer versions of the region registers also support dividing these
TCMs in two separate banks, so for example an 8KiB ITCM is divided
into two 4KiB banks with its own control registers. The idea is to
be able to lock and hide one of the banks for use by the secure
world (TrustZone).”…””}”(hj6  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K,hh£hžhubh¸)”}”(hŒTCM is used for a few things:”h]”hŒTCM is used for a few things:”…””}”(hjD  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K2hh£hžhubhŒbullet_list”“”)”}”(hhh]”(hŒ	list_item”“”)”}”(hŒbFIQ and other interrupt handlers that need deterministic
timing and cannot wait for cache misses.
”h]”h¸)”}”(hŒaFIQ and other interrupt handlers that need deterministic
timing and cannot wait for cache misses.”h]”hŒaFIQ and other interrupt handlers that need deterministic
timing and cannot wait for cache misses.”…””}”(hj]  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K4hjY  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jW  hjT  hžhhŸh¶h NubjX  )”}”(hŒ­Idle loops where all external RAM is set to self-refresh
retention mode, so only on-chip RAM is accessible by
the CPU and then we hang inside ITCM waiting for an
interrupt.
”h]”h¸)”}”(hŒ¬Idle loops where all external RAM is set to self-refresh
retention mode, so only on-chip RAM is accessible by
the CPU and then we hang inside ITCM waiting for an
interrupt.”h]”hŒ¬Idle loops where all external RAM is set to self-refresh
retention mode, so only on-chip RAM is accessible by
the CPU and then we hang inside ITCM waiting for an
interrupt.”…””}”(hju  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K7hjq  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jW  hjT  hžhhŸh¶h NubjX  )”}”(hŒZOther operations which implies shutting off or reconfiguring
the external RAM controller.
”h]”h¸)”}”(hŒYOther operations which implies shutting off or reconfiguring
the external RAM controller.”h]”hŒYOther operations which implies shutting off or reconfiguring
the external RAM controller.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K<hj‰  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jW  hjT  hžhhŸh¶h Nubeh}”(h]”h ]”h"]”h$]”h&]”Œbullet”Œ-”uh1jR  hŸh¶h K4hh£hžhubh¸)”}”(hŒsThere is an interface for using TCM on the ARM architecture
in <asm/tcm.h>. Using this interface it is possible to:”h]”hŒsThere is an interface for using TCM on the ARM architecture
in <asm/tcm.h>. Using this interface it is possible to:”…””}”(hj©  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K?hh£hžhubjS  )”}”(hhh]”(jX  )”}”(hŒ7Define the physical address and size of ITCM and DTCM.
”h]”h¸)”}”(hŒ6Define the physical address and size of ITCM and DTCM.”h]”hŒ6Define the physical address and size of ITCM and DTCM.”…””}”(hj¾  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KBhjº  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jW  hj·  hžhhŸh¶h NubjX  )”}”(hŒ(Tag functions to be compiled into ITCM.
”h]”h¸)”}”(hŒ'Tag functions to be compiled into ITCM.”h]”hŒ'Tag functions to be compiled into ITCM.”…””}”(hjÖ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KDhjÒ  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jW  hj·  hžhhŸh¶h NubjX  )”}”(hŒ9Tag data and constants to be allocated to DTCM and ITCM.
”h]”h¸)”}”(hŒ8Tag data and constants to be allocated to DTCM and ITCM.”h]”hŒ8Tag data and constants to be allocated to DTCM and ITCM.”…””}”(hjî  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KFhjê  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jW  hj·  hžhhŸh¶h NubjX  )”}”(hX  Have the remaining TCM RAM added to a special
allocation pool with gen_pool_create() and gen_pool_add()
and provide tcm_alloc() and tcm_free() for this
memory. Such a heap is great for things like saving
device state when shutting off device power domains.
”h]”h¸)”}”(hX   Have the remaining TCM RAM added to a special
allocation pool with gen_pool_create() and gen_pool_add()
and provide tcm_alloc() and tcm_free() for this
memory. Such a heap is great for things like saving
device state when shutting off device power domains.”h]”hX   Have the remaining TCM RAM added to a special
allocation pool with gen_pool_create() and gen_pool_add()
and provide tcm_alloc() and tcm_free() for this
memory. Such a heap is great for things like saving
device state when shutting off device power domains.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KHhj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jW  hj·  hžhhŸh¶h Nubeh}”(h]”h ]”h"]”h$]”h&]”j§  j¨  uh1jR  hŸh¶h KBhh£hžhubh¸)”}”(hŒ‹A machine that has TCM memory shall select HAVE_TCM from
arch/arm/Kconfig for itself. Code that needs to use TCM shall
#include <asm/tcm.h>”h]”hŒ‹A machine that has TCM memory shall select HAVE_TCM from
arch/arm/Kconfig for itself. Code that needs to use TCM shall
#include <asm/tcm.h>”…””}”(hj   hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KNhh£hžhubh¸)”}”(hŒNFunctions to go into itcm can be tagged like this:
int __tcmfunc foo(int bar);”h]”hŒNFunctions to go into itcm can be tagged like this:
int __tcmfunc foo(int bar);”…””}”(hj.  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KRhh£hžhubh¸)”}”(hŒÍSince these are marked to become long_calls and you may want
to have functions called locally inside the TCM without
wasting space, there is also the __tcmlocalfunc prefix that
will make the call relative.”h]”hŒÍSince these are marked to become long_calls and you may want
to have functions called locally inside the TCM without
wasting space, there is also the __tcmlocalfunc prefix that
will make the call relative.”…””}”(hj<  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KUhh£hžhubh¸)”}”(hŒ3Variables to go into dtcm can be tagged like this::”h]”hŒ2Variables to go into dtcm can be tagged like this:”…””}”(hjJ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KZhh£hžhubhŒliteral_block”“”)”}”(hŒint __tcmdata foo;”h]”hŒint __tcmdata foo;”…””}”hjZ  sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1jX  hŸh¶h K\hh£hžhubh¸)”}”(hŒ#Constants can be tagged like this::”h]”hŒ"Constants can be tagged like this:”…””}”(hjj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K^hh£hžhubjY  )”}”(hŒint __tcmconst foo;”h]”hŒint __tcmconst foo;”…””}”hjx  sbah}”(h]”h ]”h"]”h$]”h&]”jh  ji  uh1jX  hŸh¶h K`hh£hžhubh¸)”}”(hŒ$To put assembler into TCM just use::”h]”hŒ#To put assembler into TCM just use:”…””}”(hj†  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Kbhh£hžhubjY  )”}”(hŒ,.section ".tcm.text" or .section ".tcm.data"”h]”hŒ,.section ".tcm.text" or .section ".tcm.data"”…””}”hj”  sbah}”(h]”h ]”h"]”h$]”h&]”jh  ji  uh1jX  hŸh¶h Kdhh£hžhubh¸)”}”(hŒrespectively.”h]”hŒrespectively.”…””}”(hj¢  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Kfhh£hžhubh¸)”}”(hŒExample code::”h]”hŒExample code:”…””}”(hj°  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khhh£hžhubjY  )”}”(hXÈ  #include <asm/tcm.h>

/* Uninitialized data */
static u32 __tcmdata tcmvar;
/* Initialized data */
static u32 __tcmdata tcmassigned = 0x2BADBABEU;
/* Constant */
static const u32 __tcmconst tcmconst = 0xCAFEBABEU;

static void __tcmlocalfunc tcm_to_tcm(void)
{
      int i;
      for (i = 0; i < 100; i++)
              tcmvar ++;
}

static void __tcmfunc hello_tcm(void)
{
      /* Some abstract code that runs in ITCM */
      int i;
      for (i = 0; i < 100; i++) {
              tcmvar ++;
      }
      tcm_to_tcm();
}

static void __init test_tcm(void)
{
      u32 *tcmem;
      int i;

      hello_tcm();
      printk("Hello TCM executed from ITCM RAM\n");

      printk("TCM variable from testrun: %u @ %p\n", tcmvar, &tcmvar);
      tcmvar = 0xDEADBEEFU;
      printk("TCM variable: 0x%x @ %p\n", tcmvar, &tcmvar);

      printk("TCM assigned variable: 0x%x @ %p\n", tcmassigned, &tcmassigned);

      printk("TCM constant: 0x%x @ %p\n", tcmconst, &tcmconst);

      /* Allocate some TCM memory from the pool */
      tcmem = tcm_alloc(20);
      if (tcmem) {
              printk("TCM Allocated 20 bytes of TCM @ %p\n", tcmem);
              tcmem[0] = 0xDEADBEEFU;
              tcmem[1] = 0x2BADBABEU;
              tcmem[2] = 0xCAFEBABEU;
              tcmem[3] = 0xDEADBEEFU;
              tcmem[4] = 0x2BADBABEU;
              for (i = 0; i < 5; i++)
                      printk("TCM tcmem[%d] = %08x\n", i, tcmem[i]);
              tcm_free(tcmem, 20);
      }
}”h]”hXÈ  #include <asm/tcm.h>

/* Uninitialized data */
static u32 __tcmdata tcmvar;
/* Initialized data */
static u32 __tcmdata tcmassigned = 0x2BADBABEU;
/* Constant */
static const u32 __tcmconst tcmconst = 0xCAFEBABEU;

static void __tcmlocalfunc tcm_to_tcm(void)
{
      int i;
      for (i = 0; i < 100; i++)
              tcmvar ++;
}

static void __tcmfunc hello_tcm(void)
{
      /* Some abstract code that runs in ITCM */
      int i;
      for (i = 0; i < 100; i++) {
              tcmvar ++;
      }
      tcm_to_tcm();
}

static void __init test_tcm(void)
{
      u32 *tcmem;
      int i;

      hello_tcm();
      printk("Hello TCM executed from ITCM RAM\n");

      printk("TCM variable from testrun: %u @ %p\n", tcmvar, &tcmvar);
      tcmvar = 0xDEADBEEFU;
      printk("TCM variable: 0x%x @ %p\n", tcmvar, &tcmvar);

      printk("TCM assigned variable: 0x%x @ %p\n", tcmassigned, &tcmassigned);

      printk("TCM constant: 0x%x @ %p\n", tcmconst, &tcmconst);

      /* Allocate some TCM memory from the pool */
      tcmem = tcm_alloc(20);
      if (tcmem) {
              printk("TCM Allocated 20 bytes of TCM @ %p\n", tcmem);
              tcmem[0] = 0xDEADBEEFU;
              tcmem[1] = 0x2BADBABEU;
              tcmem[2] = 0xCAFEBABEU;
              tcmem[3] = 0xDEADBEEFU;
              tcmem[4] = 0x2BADBABEU;
              for (i = 0; i < 5; i++)
                      printk("TCM tcmem[%d] = %08x\n", i, tcmem[i]);
              tcm_free(tcmem, 20);
      }
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