diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-06 20:12:03 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-06 20:12:03 -0500 |
| commit | 1197ab2942f920f261952de0c392ac749a35796b (patch) | |
| tree | 4922ccc8a6061e5ece6ac7420001f3bf4524ea92 /Documentation/devicetree/bindings | |
| parent | ec773e99ab4abce07b1ae23117179c2861831964 (diff) | |
| parent | 96cc017c5b7ec095ef047d3c1952b6b6bbf98943 (diff) | |
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (106 commits)
powerpc/p3060qds: Add support for P3060QDS board
powerpc/83xx: Add shutdown request support to MCU handling on MPC8349 MITX
powerpc/85xx: Make kexec to interate over online cpus
powerpc/fsl_booke: Fix comment in head_fsl_booke.S
powerpc/85xx: issue 15 EOI after core reset for FSL CoreNet devices
powerpc/8xxx: Fix interrupt handling in MPC8xxx GPIO driver
powerpc/85xx: Add 'fsl,pq3-gpio' compatiable for GPIO driver
powerpc/86xx: Correct Gianfar support for GE boards
powerpc/cpm: Clear muram before it is in use.
drivers/virt: add ioctl for 32-bit compat on 64-bit to fsl-hv-manager
powerpc/fsl_msi: add support for "msi-address-64" property
powerpc/85xx: Setup secondary cores PIR with hard SMP id
powerpc/fsl-booke: Fix settlbcam for 64-bit
powerpc/85xx: Adding DCSR node to dtsi device trees
powerpc/85xx: clean up FPGA device tree nodes for Freecsale QorIQ boards
powerpc/85xx: fix PHYS_64BIT selection for P1022DS
powerpc/fsl-booke: Fix setup_initial_memory_limit to not blindly map
powerpc: respect mem= setting for early memory limit setup
powerpc: Update corenet64_smp_defconfig
powerpc: Update mpc85xx/corenet 32-bit defconfigs
...
Fix up trivial conflicts in:
- arch/powerpc/configs/40x/hcu4_defconfig
removed stale file, edited elsewhere
- arch/powerpc/include/asm/udbg.h, arch/powerpc/kernel/udbg.c:
added opal and gelic drivers vs added ePAPR driver
- drivers/tty/serial/8250.c
moved UPIO_TSI to powerpc vs removed UPIO_DWAPB support
Diffstat (limited to 'Documentation/devicetree/bindings')
3 files changed, 455 insertions, 12 deletions
diff --git a/Documentation/devicetree/bindings/powerpc/fsl/board.txt b/Documentation/devicetree/bindings/powerpc/fsl/board.txt index 39e941515a36..380914e965e0 100644 --- a/Documentation/devicetree/bindings/powerpc/fsl/board.txt +++ b/Documentation/devicetree/bindings/powerpc/fsl/board.txt | |||
| @@ -1,3 +1,8 @@ | |||
| 1 | Freescale Reference Board Bindings | ||
| 2 | |||
| 3 | This document describes device tree bindings for various devices that | ||
| 4 | exist on some Freescale reference boards. | ||
| 5 | |||
| 1 | * Board Control and Status (BCSR) | 6 | * Board Control and Status (BCSR) |
| 2 | 7 | ||
| 3 | Required properties: | 8 | Required properties: |
| @@ -12,25 +17,26 @@ Example: | |||
| 12 | reg = <f8000000 8000>; | 17 | reg = <f8000000 8000>; |
| 13 | }; | 18 | }; |
| 14 | 19 | ||
| 15 | * Freescale on board FPGA | 20 | * Freescale on-board FPGA |
| 16 | 21 | ||
| 17 | This is the memory-mapped registers for on board FPGA. | 22 | This is the memory-mapped registers for on board FPGA. |
| 18 | 23 | ||
| 19 | Required properities: | 24 | Required properities: |
| 20 | - compatible : should be "fsl,fpga-pixis". | 25 | - compatible: should be a board-specific string followed by a string |
| 21 | - reg : should contain the address and the length of the FPPGA register | 26 | indicating the type of FPGA. Example: |
| 22 | set. | 27 | "fsl,<board>-fpga", "fsl,fpga-pixis" |
| 28 | - reg: should contain the address and the length of the FPGA register set. | ||
| 23 | - interrupt-parent: should specify phandle for the interrupt controller. | 29 | - interrupt-parent: should specify phandle for the interrupt controller. |
| 24 | - interrupts : should specify event (wakeup) IRQ. | 30 | - interrupts: should specify event (wakeup) IRQ. |
| 25 | 31 | ||
| 26 | Example (MPC8610HPCD): | 32 | Example (P1022DS): |
| 27 | 33 | ||
| 28 | board-control@e8000000 { | 34 | board-control@3,0 { |
| 29 | compatible = "fsl,fpga-pixis"; | 35 | compatible = "fsl,p1022ds-fpga", "fsl,fpga-ngpixis"; |
| 30 | reg = <0xe8000000 32>; | 36 | reg = <3 0 0x30>; |
| 31 | interrupt-parent = <&mpic>; | 37 | interrupt-parent = <&mpic>; |
| 32 | interrupts = <8 8>; | 38 | interrupts = <8 8 0 0>; |
| 33 | }; | 39 | }; |
| 34 | 40 | ||
| 35 | * Freescale BCSR GPIO banks | 41 | * Freescale BCSR GPIO banks |
| 36 | 42 | ||
diff --git a/Documentation/devicetree/bindings/powerpc/fsl/dcsr.txt b/Documentation/devicetree/bindings/powerpc/fsl/dcsr.txt new file mode 100644 index 000000000000..9d54eb5a295f --- /dev/null +++ b/Documentation/devicetree/bindings/powerpc/fsl/dcsr.txt | |||
| @@ -0,0 +1,395 @@ | |||
| 1 | =================================================================== | ||
| 2 | Debug Control and Status Register (DCSR) Binding | ||
| 3 | Copyright 2011 Freescale Semiconductor Inc. | ||
| 4 | |||
| 5 | NOTE: The bindings described in this document are preliminary and subject | ||
| 6 | to change. Some of the compatible strings that contain only generic names | ||
| 7 | may turn out to be inappropriate, or need additional properties to describe | ||
| 8 | the integration of the block with the rest of the chip. | ||
| 9 | |||
| 10 | ===================================================================== | ||
| 11 | Debug Control and Status Register Memory Map | ||
| 12 | |||
| 13 | Description | ||
| 14 | |||
| 15 | This node defines the base address and range for the | ||
| 16 | defined DCSR Memory Map. Child nodes will describe the individual | ||
| 17 | debug blocks defined within this memory space. | ||
| 18 | |||
| 19 | PROPERTIES | ||
| 20 | |||
| 21 | - compatible | ||
| 22 | Usage: required | ||
| 23 | Value type: <string> | ||
| 24 | Definition: Must include "fsl,dcsr" and "simple-bus". | ||
| 25 | The DCSR space exists in the memory-mapped bus. | ||
| 26 | |||
| 27 | - #address-cells | ||
| 28 | Usage: required | ||
| 29 | Value type: <u32> | ||
| 30 | Definition: A standard property. Defines the number of cells | ||
| 31 | or representing physical addresses in child nodes. | ||
| 32 | |||
| 33 | - #size-cells | ||
| 34 | Usage: required | ||
| 35 | Value type: <u32> | ||
| 36 | Definition: A standard property. Defines the number of cells | ||
| 37 | or representing the size of physical addresses in | ||
| 38 | child nodes. | ||
| 39 | |||
| 40 | - ranges | ||
| 41 | Usage: required | ||
| 42 | Value type: <prop-encoded-array> | ||
| 43 | Definition: A standard property. Specifies the physical address | ||
| 44 | range of the DCSR space. | ||
| 45 | |||
| 46 | EXAMPLE | ||
| 47 | dcsr: dcsr@f00000000 { | ||
| 48 | #address-cells = <1>; | ||
| 49 | #size-cells = <1>; | ||
| 50 | compatible = "fsl,dcsr", "simple-bus"; | ||
| 51 | ranges = <0x00000000 0xf 0x00000000 0x01008000>; | ||
| 52 | }; | ||
| 53 | |||
| 54 | ===================================================================== | ||
| 55 | Event Processing Unit | ||
| 56 | |||
| 57 | This node represents the region of DCSR space allocated to the EPU | ||
| 58 | |||
| 59 | PROPERTIES | ||
| 60 | |||
| 61 | - compatible | ||
| 62 | Usage: required | ||
| 63 | Value type: <string> | ||
| 64 | Definition: Must include "fsl,dcsr-epu" | ||
| 65 | |||
| 66 | - interrupts | ||
| 67 | Usage: required | ||
| 68 | Value type: <prop_encoded-array> | ||
| 69 | Definition: Specifies the interrupts generated by the EPU. | ||
| 70 | The value of the interrupts property consists of three | ||
| 71 | interrupt specifiers. The format of the specifier is defined | ||
| 72 | by the binding document describing the node's interrupt parent. | ||
| 73 | |||
| 74 | The EPU counters can be configured to assert the performance | ||
| 75 | monitor interrupt signal based on either counter overflow or value | ||
| 76 | match. Which counter asserted the interrupt is captured in an EPU | ||
| 77 | Counter Interrupt Status Register (EPCPUISR). | ||
| 78 | |||
| 79 | The EPU unit can also be configured to assert either or both of | ||
| 80 | two interrupt signals based on debug event sources within the SoC. | ||
| 81 | The interrupt signals are epu_xt_int0 and epu_xt_int1. | ||
| 82 | Which event source asserted the interrupt is captured in an EPU | ||
| 83 | Interrupt Status Register (EPISR0,EPISR1). | ||
| 84 | |||
| 85 | Interrupt numbers are lised in order (perfmon, event0, event1). | ||
| 86 | |||
| 87 | - interrupt-parent | ||
| 88 | Usage: required | ||
| 89 | Value type: <phandle> | ||
| 90 | Definition: A single <phandle> value that points | ||
| 91 | to the interrupt parent to which the child domain | ||
| 92 | is being mapped. Value must be "&mpic" | ||
| 93 | |||
| 94 | - reg | ||
| 95 | Usage: required | ||
| 96 | Value type: <prop-encoded-array> | ||
| 97 | Definition: A standard property. Specifies the physical address | ||
| 98 | offset and length of the DCSR space registers of the device | ||
| 99 | configuration block. | ||
| 100 | |||
| 101 | EXAMPLE | ||
| 102 | dcsr-epu@0 { | ||
| 103 | compatible = "fsl,dcsr-epu"; | ||
| 104 | interrupts = <52 2 0 0 | ||
| 105 | 84 2 0 0 | ||
| 106 | 85 2 0 0>; | ||
| 107 | interrupt-parent = <&mpic>; | ||
| 108 | reg = <0x0 0x1000>; | ||
| 109 | }; | ||
| 110 | |||
| 111 | ======================================================================= | ||
| 112 | Nexus Port Controller | ||
| 113 | |||
| 114 | This node represents the region of DCSR space allocated to the NPC | ||
| 115 | |||
| 116 | PROPERTIES | ||
| 117 | |||
| 118 | - compatible | ||
| 119 | Usage: required | ||
| 120 | Value type: <string> | ||
| 121 | Definition: Must include "fsl,dcsr-npc" | ||
| 122 | |||
| 123 | - reg | ||
| 124 | Usage: required | ||
| 125 | Value type: <prop-encoded-array> | ||
| 126 | Definition: A standard property. Specifies the physical address | ||
| 127 | offset and length of the DCSR space registers of the device | ||
| 128 | configuration block. | ||
| 129 | The Nexus Port controller occupies two regions in the DCSR space | ||
| 130 | with distinct functionality. | ||
| 131 | |||
| 132 | The first register range describes the Nexus Port Controller | ||
| 133 | control and status registers. | ||
| 134 | |||
| 135 | The second register range describes the Nexus Port Controller | ||
| 136 | internal trace buffer. The NPC trace buffer is a small memory buffer | ||
| 137 | which stages the nexus trace data for transmission via the Aurora port | ||
| 138 | or to a DDR based trace buffer. In some configurations the NPC trace | ||
| 139 | buffer can be the only trace buffer used. | ||
| 140 | |||
| 141 | |||
| 142 | EXAMPLE | ||
| 143 | dcsr-npc { | ||
| 144 | compatible = "fsl,dcsr-npc"; | ||
| 145 | reg = <0x1000 0x1000 0x1000000 0x8000>; | ||
| 146 | }; | ||
| 147 | |||
| 148 | ======================================================================= | ||
| 149 | Nexus Concentrator | ||
| 150 | |||
| 151 | This node represents the region of DCSR space allocated to the NXC | ||
| 152 | |||
| 153 | PROPERTIES | ||
| 154 | |||
| 155 | - compatible | ||
| 156 | Usage: required | ||
| 157 | Value type: <string> | ||
| 158 | Definition: Must include "fsl,dcsr-nxc" | ||
| 159 | |||
| 160 | - reg | ||
| 161 | Usage: required | ||
| 162 | Value type: <prop-encoded-array> | ||
| 163 | Definition: A standard property. Specifies the physical address | ||
| 164 | offset and length of the DCSR space registers of the device | ||
| 165 | configuration block. | ||
| 166 | |||
| 167 | EXAMPLE | ||
| 168 | dcsr-nxc@2000 { | ||
| 169 | compatible = "fsl,dcsr-nxc"; | ||
| 170 | reg = <0x2000 0x1000>; | ||
| 171 | }; | ||
| 172 | ======================================================================= | ||
| 173 | CoreNet Debug Controller | ||
| 174 | |||
| 175 | This node represents the region of DCSR space allocated to | ||
| 176 | the CoreNet Debug controller. | ||
| 177 | |||
| 178 | PROPERTIES | ||
| 179 | |||
| 180 | - compatible | ||
| 181 | Usage: required | ||
| 182 | Value type: <string> | ||
| 183 | Definition: Must include "fsl,dcsr-corenet" | ||
| 184 | |||
| 185 | - reg | ||
| 186 | Usage: required | ||
| 187 | Value type: <prop-encoded-array> | ||
| 188 | Definition: A standard property. Specifies the physical address | ||
| 189 | offset and length of the DCSR space registers of the device | ||
| 190 | configuration block. | ||
| 191 | The CoreNet Debug controller occupies two regions in the DCSR space | ||
| 192 | with distinct functionality. | ||
| 193 | |||
| 194 | The first register range describes the CoreNet Debug Controller | ||
| 195 | functionalty to perform transaction and transaction attribute matches. | ||
| 196 | |||
| 197 | The second register range describes the CoreNet Debug Controller | ||
| 198 | functionalty to trigger event notifications and debug traces. | ||
| 199 | |||
| 200 | EXAMPLE | ||
| 201 | dcsr-corenet { | ||
| 202 | compatible = "fsl,dcsr-corenet"; | ||
| 203 | reg = <0x8000 0x1000 0xB0000 0x1000>; | ||
| 204 | }; | ||
| 205 | |||
| 206 | ======================================================================= | ||
| 207 | Data Path Debug controller | ||
| 208 | |||
| 209 | This node represents the region of DCSR space allocated to | ||
| 210 | the DPAA Debug Controller. This controller controls debug configuration | ||
| 211 | for the QMAN and FMAN blocks. | ||
| 212 | |||
| 213 | PROPERTIES | ||
| 214 | |||
| 215 | - compatible | ||
| 216 | Usage: required | ||
| 217 | Value type: <string> | ||
| 218 | Definition: Must include both an identifier specific to the SoC | ||
| 219 | or Debug IP of the form "fsl,<soc>-dcsr-dpaa" in addition to the | ||
| 220 | generic compatible string "fsl,dcsr-dpaa". | ||
| 221 | |||
| 222 | - reg | ||
| 223 | Usage: required | ||
| 224 | Value type: <prop-encoded-array> | ||
| 225 | Definition: A standard property. Specifies the physical address | ||
| 226 | offset and length of the DCSR space registers of the device | ||
| 227 | configuration block. | ||
| 228 | |||
| 229 | EXAMPLE | ||
| 230 | dcsr-dpaa@9000 { | ||
| 231 | compatible = "fsl,p4080-dcsr-dpaa", "fsl,dcsr-dpaa"; | ||
| 232 | reg = <0x9000 0x1000>; | ||
| 233 | }; | ||
| 234 | |||
| 235 | ======================================================================= | ||
| 236 | OCeaN Debug controller | ||
| 237 | |||
| 238 | This node represents the region of DCSR space allocated to | ||
| 239 | the OCN Debug Controller. | ||
| 240 | |||
| 241 | PROPERTIES | ||
| 242 | |||
| 243 | - compatible | ||
| 244 | Usage: required | ||
| 245 | Value type: <string> | ||
| 246 | Definition: Must include both an identifier specific to the SoC | ||
| 247 | or Debug IP of the form "fsl,<soc>-dcsr-ocn" in addition to the | ||
| 248 | generic compatible string "fsl,dcsr-ocn". | ||
| 249 | |||
| 250 | - reg | ||
| 251 | Usage: required | ||
| 252 | Value type: <prop-encoded-array> | ||
| 253 | Definition: A standard property. Specifies the physical address | ||
| 254 | offset and length of the DCSR space registers of the device | ||
| 255 | configuration block. | ||
| 256 | |||
| 257 | EXAMPLE | ||
| 258 | dcsr-ocn@11000 { | ||
| 259 | compatible = "fsl,p4080-dcsr-ocn", "fsl,dcsr-ocn"; | ||
| 260 | reg = <0x11000 0x1000>; | ||
| 261 | }; | ||
| 262 | |||
| 263 | ======================================================================= | ||
| 264 | DDR Controller Debug controller | ||
| 265 | |||
| 266 | This node represents the region of DCSR space allocated to | ||
| 267 | the OCN Debug Controller. | ||
| 268 | |||
| 269 | PROPERTIES | ||
| 270 | |||
| 271 | - compatible | ||
| 272 | Usage: required | ||
| 273 | Value type: <string> | ||
| 274 | Definition: Must include "fsl,dcsr-ddr" | ||
| 275 | |||
| 276 | - dev-handle | ||
| 277 | Usage: required | ||
| 278 | Definition: A phandle to associate this debug node with its | ||
| 279 | component controller. | ||
| 280 | |||
| 281 | - reg | ||
| 282 | Usage: required | ||
| 283 | Value type: <prop-encoded-array> | ||
| 284 | Definition: A standard property. Specifies the physical address | ||
| 285 | offset and length of the DCSR space registers of the device | ||
| 286 | configuration block. | ||
| 287 | |||
| 288 | EXAMPLE | ||
| 289 | dcsr-ddr@12000 { | ||
| 290 | compatible = "fsl,dcsr-ddr"; | ||
| 291 | dev-handle = <&ddr1>; | ||
| 292 | reg = <0x12000 0x1000>; | ||
| 293 | }; | ||
| 294 | |||
| 295 | ======================================================================= | ||
| 296 | Nexus Aurora Link Controller | ||
| 297 | |||
| 298 | This node represents the region of DCSR space allocated to | ||
| 299 | the NAL Controller. | ||
| 300 | |||
| 301 | PROPERTIES | ||
| 302 | |||
| 303 | - compatible | ||
| 304 | Usage: required | ||
| 305 | Value type: <string> | ||
| 306 | Definition: Must include both an identifier specific to the SoC | ||
| 307 | or Debug IP of the form "fsl,<soc>-dcsr-nal" in addition to the | ||
| 308 | generic compatible string "fsl,dcsr-nal". | ||
| 309 | |||
| 310 | - reg | ||
| 311 | Usage: required | ||
| 312 | Value type: <prop-encoded-array> | ||
| 313 | Definition: A standard property. Specifies the physical address | ||
| 314 | offset and length of the DCSR space registers of the device | ||
| 315 | configuration block. | ||
| 316 | |||
| 317 | EXAMPLE | ||
| 318 | dcsr-nal@18000 { | ||
| 319 | compatible = "fsl,p4080-dcsr-nal", "fsl,dcsr-nal"; | ||
| 320 | reg = <0x18000 0x1000>; | ||
| 321 | }; | ||
| 322 | |||
| 323 | |||
| 324 | ======================================================================= | ||
| 325 | Run Control and Power Management | ||
| 326 | |||
| 327 | This node represents the region of DCSR space allocated to | ||
| 328 | the RCPM Debug Controller. This functionlity is limited to the | ||
| 329 | control the debug operations of the SoC and cores. | ||
| 330 | |||
| 331 | PROPERTIES | ||
| 332 | |||
| 333 | - compatible | ||
| 334 | Usage: required | ||
| 335 | Value type: <string> | ||
| 336 | Definition: Must include both an identifier specific to the SoC | ||
| 337 | or Debug IP of the form "fsl,<soc>-dcsr-rcpm" in addition to the | ||
| 338 | generic compatible string "fsl,dcsr-rcpm". | ||
| 339 | |||
| 340 | - reg | ||
| 341 | Usage: required | ||
| 342 | Value type: <prop-encoded-array> | ||
| 343 | Definition: A standard property. Specifies the physical address | ||
| 344 | offset and length of the DCSR space registers of the device | ||
| 345 | configuration block. | ||
| 346 | |||
| 347 | EXAMPLE | ||
| 348 | dcsr-rcpm@22000 { | ||
| 349 | compatible = "fsl,p4080-dcsr-rcpm", "fsl,dcsr-rcpm"; | ||
| 350 | reg = <0x22000 0x1000>; | ||
| 351 | }; | ||
| 352 | |||
| 353 | ======================================================================= | ||
| 354 | Core Service Bridge Proxy | ||
| 355 | |||
| 356 | This node represents the region of DCSR space allocated to | ||
| 357 | the Core Service Bridge Proxies. | ||
| 358 | There is one Core Service Bridge Proxy device for each CPU in the system. | ||
| 359 | This functionlity provides access to the debug operations of the CPU. | ||
| 360 | |||
| 361 | PROPERTIES | ||
| 362 | |||
| 363 | - compatible | ||
| 364 | Usage: required | ||
| 365 | Value type: <string> | ||
| 366 | Definition: Must include both an identifier specific to the cpu | ||
| 367 | of the form "fsl,dcsr-<cpu>-sb-proxy" in addition to the | ||
| 368 | generic compatible string "fsl,dcsr-cpu-sb-proxy". | ||
| 369 | |||
| 370 | - cpu-handle | ||
| 371 | Usage: required | ||
| 372 | Definition: A phandle to associate this debug node with its cpu. | ||
| 373 | |||
| 374 | - reg | ||
| 375 | Usage: required | ||
| 376 | Value type: <prop-encoded-array> | ||
| 377 | Definition: A standard property. Specifies the physical address | ||
| 378 | offset and length of the DCSR space registers of the device | ||
| 379 | configuration block. | ||
| 380 | |||
| 381 | EXAMPLE | ||
| 382 | dcsr-cpu-sb-proxy@40000 { | ||
| 383 | compatible = "fsl,dcsr-e500mc-sb-proxy", | ||
| 384 | "fsl,dcsr-cpu-sb-proxy"; | ||
| 385 | cpu-handle = <&cpu0>; | ||
| 386 | reg = <0x40000 0x1000>; | ||
| 387 | }; | ||
| 388 | dcsr-cpu-sb-proxy@41000 { | ||
| 389 | compatible = "fsl,dcsr-e500mc-sb-proxy", | ||
| 390 | "fsl,dcsr-cpu-sb-proxy"; | ||
| 391 | cpu-handle = <&cpu1>; | ||
| 392 | reg = <0x41000 0x1000>; | ||
| 393 | }; | ||
| 394 | |||
| 395 | ======================================================================= | ||
diff --git a/Documentation/devicetree/bindings/powerpc/fsl/msi-pic.txt b/Documentation/devicetree/bindings/powerpc/fsl/msi-pic.txt index 70558c3f3682..5d586e1ccaf5 100644 --- a/Documentation/devicetree/bindings/powerpc/fsl/msi-pic.txt +++ b/Documentation/devicetree/bindings/powerpc/fsl/msi-pic.txt | |||
| @@ -25,6 +25,16 @@ Required properties: | |||
| 25 | are routed to IPIC, and for 85xx/86xx cpu the interrupts are routed | 25 | are routed to IPIC, and for 85xx/86xx cpu the interrupts are routed |
| 26 | to MPIC. | 26 | to MPIC. |
| 27 | 27 | ||
| 28 | Optional properties: | ||
| 29 | - msi-address-64: 64-bit PCI address of the MSIIR register. The MSIIR register | ||
| 30 | is used for MSI messaging. The address of MSIIR in PCI address space is | ||
| 31 | the MSI message address. | ||
| 32 | |||
| 33 | This property may be used in virtualized environments where the hypervisor | ||
| 34 | has created an alternate mapping for the MSIR block. See below for an | ||
| 35 | explanation. | ||
| 36 | |||
| 37 | |||
| 28 | Example: | 38 | Example: |
| 29 | msi@41600 { | 39 | msi@41600 { |
| 30 | compatible = "fsl,mpc8610-msi", "fsl,mpic-msi"; | 40 | compatible = "fsl,mpc8610-msi", "fsl,mpic-msi"; |
| @@ -41,3 +51,35 @@ Example: | |||
| 41 | 0xe7 0>; | 51 | 0xe7 0>; |
| 42 | interrupt-parent = <&mpic>; | 52 | interrupt-parent = <&mpic>; |
| 43 | }; | 53 | }; |
| 54 | |||
| 55 | The Freescale hypervisor and msi-address-64 | ||
| 56 | ------------------------------------------- | ||
| 57 | Normally, PCI devices have access to all of CCSR via an ATMU mapping. The | ||
| 58 | Freescale MSI driver calculates the address of MSIIR (in the MSI register | ||
| 59 | block) and sets that address as the MSI message address. | ||
| 60 | |||
| 61 | In a virtualized environment, the hypervisor may need to create an IOMMU | ||
| 62 | mapping for MSIIR. The Freescale ePAPR hypervisor has this requirement | ||
| 63 | because of hardware limitations of the Peripheral Access Management Unit | ||
| 64 | (PAMU), which is currently the only IOMMU that the hypervisor supports. | ||
| 65 | The ATMU is programmed with the guest physical address, and the PAMU | ||
| 66 | intercepts transactions and reroutes them to the true physical address. | ||
| 67 | |||
| 68 | In the PAMU, each PCI controller is given only one primary window. The | ||
| 69 | PAMU restricts DMA operations so that they can only occur within a window. | ||
| 70 | Because PCI devices must be able to DMA to memory, the primary window must | ||
| 71 | be used to cover all of the guest's memory space. | ||
| 72 | |||
| 73 | PAMU primary windows can be divided into 256 subwindows, and each | ||
| 74 | subwindow can have its own address mapping ("guest physical" to "true | ||
| 75 | physical"). However, each subwindow has to have the same alignment, which | ||
| 76 | means they cannot be located at just any address. Because of these | ||
| 77 | restrictions, it is usually impossible to create a 4KB subwindow that | ||
| 78 | covers MSIIR where it's normally located. | ||
| 79 | |||
| 80 | Therefore, the hypervisor has to create a subwindow inside the same | ||
| 81 | primary window used for memory, but mapped to the MSIR block (where MSIIR | ||
| 82 | lives). The first subwindow after the end of guest memory is used for | ||
| 83 | this. The address specified in the msi-address-64 property is the PCI | ||
| 84 | address of MSIIR. The hypervisor configures the PAMU to map that address to | ||
| 85 | the true physical address of MSIIR. | ||
