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linux-stable/include/linux/arm-smccc.h
Linus Torvalds 822ef14e9d ARM: SoC driver updates for v5.9 
A couple of subsystems have their own subsystem maintainers but choose
 to have the code merged through the soc tree as upstream, as the code
 tends to be used across multiple SoCs or has SoC specific drivers itself:
 
  - memory controllers:
      Krzysztof Kozlowski takes ownership of the drivers/memory
      subsystem and its drivers, starting out with a set of cleanup
      patches.
      A larger driver for the Tegra memory controller that was accidentally
      missed for v5.8 is now added.
 
  - reset controllers:
      Only minor updates to drivers/reset this time
 
  - firmware:
      The "turris mox" firmware driver gains support for signed firmware blobs
      The tegra firmware driver gets extended to export some debug information
      Various updates to i.MX firmware drivers, mostly cosmetic
 
  - ARM SCMI/SCPI:
      A new mechanism for platform notifications is added, among a number
      of minor changes.
 
  - optee:
      Probing of the TEE bus is rewritten to better support detection of
      devices that depend on the tee-supplicant user space.
      A new firmware based trusted platform module (fTPM) driver is added
      based on OP-TEE
 
  - SoC attributes:
      A new driver is added to provide a generic soc_device for identifying
      a machine through the SMCCC ARCH_SOC_ID firmware interface rather than
      by probing SoC family specific registers.
      The series also contains some cleanups to the common soc_device code.
 
 There are also a number of updates to SoC specific drivers,
 the main ones are:
 
  - Mediatek cmdq driver gains a few in-kernel interfaces
 
  - Minor updates to Qualcomm RPMh, socinfo, rpm drivers, mostly adding
    support for additional SoC variants
 
  - The Qualcomm GENI core code gains interconnect path voting and
    performance level support, and integrating this into a number of
    device drivers.
 
  - A new driver for Samsung Exynos5800 voltage coupler for
 
  - Renesas RZ/G2H (R8A774E1) SoC support gets added to a couple of SoC
    specific device drivers
 
  - Updates to the TI K3 Ring Accelerator driver
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Merge tag 'arm-drivers-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull ARM SoC driver updates from Arnd Bergmann:
 "A couple of subsystems have their own subsystem maintainers but choose
  to have the code merged through the soc tree as upstream, as the code
  tends to be used across multiple SoCs or has SoC specific drivers
  itself:

   - memory controllers:

     Krzysztof Kozlowski takes ownership of the drivers/memory subsystem
     and its drivers, starting out with a set of cleanup patches.

     A larger driver for the Tegra memory controller that was
     accidentally missed for v5.8 is now added.

   - reset controllers:

     Only minor updates to drivers/reset this time

   - firmware:

     The "turris mox" firmware driver gains support for signed firmware
     blobs The tegra firmware driver gets extended to export some debug
     information Various updates to i.MX firmware drivers, mostly
     cosmetic

   - ARM SCMI/SCPI:

     A new mechanism for platform notifications is added, among a number
     of minor changes.

   - optee:

     Probing of the TEE bus is rewritten to better support detection of
     devices that depend on the tee-supplicant user space. A new
     firmware based trusted platform module (fTPM) driver is added based
     on OP-TEE

   - SoC attributes:

     A new driver is added to provide a generic soc_device for
     identifying a machine through the SMCCC ARCH_SOC_ID firmware
     interface rather than by probing SoC family specific registers.

     The series also contains some cleanups to the common soc_device
     code.

  There are also a number of updates to SoC specific drivers, the main
  ones are:

   - Mediatek cmdq driver gains a few in-kernel interfaces

   - Minor updates to Qualcomm RPMh, socinfo, rpm drivers, mostly adding
     support for additional SoC variants

   - The Qualcomm GENI core code gains interconnect path voting and
     performance level support, and integrating this into a number of
     device drivers.

   - A new driver for Samsung Exynos5800 voltage coupler for

   - Renesas RZ/G2H (R8A774E1) SoC support gets added to a couple of SoC
     specific device drivers

   - Updates to the TI K3 Ring Accelerator driver"

* tag 'arm-drivers-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (164 commits)
  soc: qcom: geni: Fix unused label warning
  soc: qcom: smd-rpm: Fix kerneldoc
  memory: jz4780_nemc: Only request IO memory the driver will use
  soc: qcom: pdr: Reorder the PD state indication ack
  MAINTAINERS: Add Git repository for memory controller drivers
  memory: brcmstb_dpfe: Fix language typo
  memory: samsung: exynos5422-dmc: Correct white space issues
  memory: samsung: exynos-srom: Correct alignment
  memory: pl172: Enclose macro argument usage in parenthesis
  memory: of: Correct kerneldoc
  memory: omap-gpmc: Fix language typo
  memory: omap-gpmc: Correct white space issues
  memory: omap-gpmc: Use 'unsigned int' for consistency
  memory: omap-gpmc: Enclose macro argument usage in parenthesis
  memory: omap-gpmc: Correct kerneldoc
  memory: mvebu-devbus: Align with open parenthesis
  memory: mvebu-devbus: Add missing braces to all arms of if statement
  memory: bt1-l2-ctl: Add blank lines after declarations
  soc: TI knav_qmss: make symbol 'knav_acc_range_ops' static
  firmware: ti_sci: Replace HTTP links with HTTPS ones
  ...
2020-08-03 19:30:59 -07:00

407 lines
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2015, Linaro Limited
*/
#ifndef __LINUX_ARM_SMCCC_H
#define __LINUX_ARM_SMCCC_H
#include <linux/init.h>
#include <uapi/linux/const.h>
/*
* This file provides common defines for ARM SMC Calling Convention as
* specified in
* https://developer.arm.com/docs/den0028/latest
*
* This code is up-to-date with version DEN 0028 C
*/
#define ARM_SMCCC_STD_CALL _AC(0,U)
#define ARM_SMCCC_FAST_CALL _AC(1,U)
#define ARM_SMCCC_TYPE_SHIFT 31
#define ARM_SMCCC_SMC_32 0
#define ARM_SMCCC_SMC_64 1
#define ARM_SMCCC_CALL_CONV_SHIFT 30
#define ARM_SMCCC_OWNER_MASK 0x3F
#define ARM_SMCCC_OWNER_SHIFT 24
#define ARM_SMCCC_FUNC_MASK 0xFFFF
#define ARM_SMCCC_IS_FAST_CALL(smc_val) \
((smc_val) & (ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT))
#define ARM_SMCCC_IS_64(smc_val) \
((smc_val) & (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT))
#define ARM_SMCCC_FUNC_NUM(smc_val) ((smc_val) & ARM_SMCCC_FUNC_MASK)
#define ARM_SMCCC_OWNER_NUM(smc_val) \
(((smc_val) >> ARM_SMCCC_OWNER_SHIFT) & ARM_SMCCC_OWNER_MASK)
#define ARM_SMCCC_CALL_VAL(type, calling_convention, owner, func_num) \
(((type) << ARM_SMCCC_TYPE_SHIFT) | \
((calling_convention) << ARM_SMCCC_CALL_CONV_SHIFT) | \
(((owner) & ARM_SMCCC_OWNER_MASK) << ARM_SMCCC_OWNER_SHIFT) | \
((func_num) & ARM_SMCCC_FUNC_MASK))
#define ARM_SMCCC_OWNER_ARCH 0
#define ARM_SMCCC_OWNER_CPU 1
#define ARM_SMCCC_OWNER_SIP 2
#define ARM_SMCCC_OWNER_OEM 3
#define ARM_SMCCC_OWNER_STANDARD 4
#define ARM_SMCCC_OWNER_STANDARD_HYP 5
#define ARM_SMCCC_OWNER_TRUSTED_APP 48
#define ARM_SMCCC_OWNER_TRUSTED_APP_END 49
#define ARM_SMCCC_OWNER_TRUSTED_OS 50
#define ARM_SMCCC_OWNER_TRUSTED_OS_END 63
#define ARM_SMCCC_QUIRK_NONE 0
#define ARM_SMCCC_QUIRK_QCOM_A6 1 /* Save/restore register a6 */
#define ARM_SMCCC_VERSION_1_0 0x10000
#define ARM_SMCCC_VERSION_1_1 0x10001
#define ARM_SMCCC_VERSION_1_2 0x10002
#define ARM_SMCCC_VERSION_FUNC_ID \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_32, \
0, 0)
#define ARM_SMCCC_ARCH_FEATURES_FUNC_ID \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_32, \
0, 1)
#define ARM_SMCCC_ARCH_SOC_ID \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_32, \
0, 2)
#define ARM_SMCCC_ARCH_WORKAROUND_1 \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_32, \
0, 0x8000)
#define ARM_SMCCC_ARCH_WORKAROUND_2 \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_32, \
0, 0x7fff)
/* Paravirtualised time calls (defined by ARM DEN0057A) */
#define ARM_SMCCC_HV_PV_TIME_FEATURES \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_64, \
ARM_SMCCC_OWNER_STANDARD_HYP, \
0x20)
#define ARM_SMCCC_HV_PV_TIME_ST \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_64, \
ARM_SMCCC_OWNER_STANDARD_HYP, \
0x21)
/*
* Return codes defined in ARM DEN 0070A
* ARM DEN 0070A is now merged/consolidated into ARM DEN 0028 C
*/
#define SMCCC_RET_SUCCESS 0
#define SMCCC_RET_NOT_SUPPORTED -1
#define SMCCC_RET_NOT_REQUIRED -2
#define SMCCC_RET_INVALID_PARAMETER -3
#ifndef __ASSEMBLY__
#include <linux/linkage.h>
#include <linux/types.h>
enum arm_smccc_conduit {
SMCCC_CONDUIT_NONE,
SMCCC_CONDUIT_SMC,
SMCCC_CONDUIT_HVC,
};
/**
* arm_smccc_1_1_get_conduit()
*
* Returns the conduit to be used for SMCCCv1.1 or later.
*
* When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE.
*/
enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
/**
* arm_smccc_get_version()
*
* Returns the version to be used for SMCCCv1.1 or later.
*
* When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this
* does not imply the presence of firmware or a valid conduit. Caller
* handling SMCCCv1.0 must determine the conduit by other means.
*/
u32 arm_smccc_get_version(void);
void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit);
/**
* struct arm_smccc_res - Result from SMC/HVC call
* @a0-a3 result values from registers 0 to 3
*/
struct arm_smccc_res {
unsigned long a0;
unsigned long a1;
unsigned long a2;
unsigned long a3;
};
/**
* struct arm_smccc_quirk - Contains quirk information
* @id: quirk identification
* @state: quirk specific information
* @a6: Qualcomm quirk entry for returning post-smc call contents of a6
*/
struct arm_smccc_quirk {
int id;
union {
unsigned long a6;
} state;
};
/**
* __arm_smccc_smc() - make SMC calls
* @a0-a7: arguments passed in registers 0 to 7
* @res: result values from registers 0 to 3
* @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
*
* This function is used to make SMC calls following SMC Calling Convention.
* The content of the supplied param are copied to registers 0 to 7 prior
* to the SMC instruction. The return values are updated with the content
* from register 0 to 3 on return from the SMC instruction. An optional
* quirk structure provides vendor specific behavior.
*/
asmlinkage void __arm_smccc_smc(unsigned long a0, unsigned long a1,
unsigned long a2, unsigned long a3, unsigned long a4,
unsigned long a5, unsigned long a6, unsigned long a7,
struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
/**
* __arm_smccc_hvc() - make HVC calls
* @a0-a7: arguments passed in registers 0 to 7
* @res: result values from registers 0 to 3
* @quirk: points to an arm_smccc_quirk, or NULL when no quirks are required.
*
* This function is used to make HVC calls following SMC Calling
* Convention. The content of the supplied param are copied to registers 0
* to 7 prior to the HVC instruction. The return values are updated with
* the content from register 0 to 3 on return from the HVC instruction. An
* optional quirk structure provides vendor specific behavior.
*/
asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
unsigned long a2, unsigned long a3, unsigned long a4,
unsigned long a5, unsigned long a6, unsigned long a7,
struct arm_smccc_res *res, struct arm_smccc_quirk *quirk);
#define arm_smccc_smc(...) __arm_smccc_smc(__VA_ARGS__, NULL)
#define arm_smccc_smc_quirk(...) __arm_smccc_smc(__VA_ARGS__)
#define arm_smccc_hvc(...) __arm_smccc_hvc(__VA_ARGS__, NULL)
#define arm_smccc_hvc_quirk(...) __arm_smccc_hvc(__VA_ARGS__)
/* SMCCC v1.1 implementation madness follows */
#ifdef CONFIG_ARM64
#define SMCCC_SMC_INST "smc #0"
#define SMCCC_HVC_INST "hvc #0"
#elif defined(CONFIG_ARM)
#include <asm/opcodes-sec.h>
#include <asm/opcodes-virt.h>
#define SMCCC_SMC_INST __SMC(0)
#define SMCCC_HVC_INST __HVC(0)
#endif
#define ___count_args(_0, _1, _2, _3, _4, _5, _6, _7, _8, x, ...) x
#define __count_args(...) \
___count_args(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0)
#define __constraint_write_0 \
"+r" (r0), "=&r" (r1), "=&r" (r2), "=&r" (r3)
#define __constraint_write_1 \
"+r" (r0), "+r" (r1), "=&r" (r2), "=&r" (r3)
#define __constraint_write_2 \
"+r" (r0), "+r" (r1), "+r" (r2), "=&r" (r3)
#define __constraint_write_3 \
"+r" (r0), "+r" (r1), "+r" (r2), "+r" (r3)
#define __constraint_write_4 __constraint_write_3
#define __constraint_write_5 __constraint_write_4
#define __constraint_write_6 __constraint_write_5
#define __constraint_write_7 __constraint_write_6
#define __constraint_read_0
#define __constraint_read_1
#define __constraint_read_2
#define __constraint_read_3
#define __constraint_read_4 "r" (r4)
#define __constraint_read_5 __constraint_read_4, "r" (r5)
#define __constraint_read_6 __constraint_read_5, "r" (r6)
#define __constraint_read_7 __constraint_read_6, "r" (r7)
#define __declare_arg_0(a0, res) \
struct arm_smccc_res *___res = res; \
register unsigned long r0 asm("r0") = (u32)a0; \
register unsigned long r1 asm("r1"); \
register unsigned long r2 asm("r2"); \
register unsigned long r3 asm("r3")
#define __declare_arg_1(a0, a1, res) \
typeof(a1) __a1 = a1; \
struct arm_smccc_res *___res = res; \
register unsigned long r0 asm("r0") = (u32)a0; \
register unsigned long r1 asm("r1") = __a1; \
register unsigned long r2 asm("r2"); \
register unsigned long r3 asm("r3")
#define __declare_arg_2(a0, a1, a2, res) \
typeof(a1) __a1 = a1; \
typeof(a2) __a2 = a2; \
struct arm_smccc_res *___res = res; \
register unsigned long r0 asm("r0") = (u32)a0; \
register unsigned long r1 asm("r1") = __a1; \
register unsigned long r2 asm("r2") = __a2; \
register unsigned long r3 asm("r3")
#define __declare_arg_3(a0, a1, a2, a3, res) \
typeof(a1) __a1 = a1; \
typeof(a2) __a2 = a2; \
typeof(a3) __a3 = a3; \
struct arm_smccc_res *___res = res; \
register unsigned long r0 asm("r0") = (u32)a0; \
register unsigned long r1 asm("r1") = __a1; \
register unsigned long r2 asm("r2") = __a2; \
register unsigned long r3 asm("r3") = __a3
#define __declare_arg_4(a0, a1, a2, a3, a4, res) \
typeof(a4) __a4 = a4; \
__declare_arg_3(a0, a1, a2, a3, res); \
register unsigned long r4 asm("r4") = __a4
#define __declare_arg_5(a0, a1, a2, a3, a4, a5, res) \
typeof(a5) __a5 = a5; \
__declare_arg_4(a0, a1, a2, a3, a4, res); \
register unsigned long r5 asm("r5") = __a5
#define __declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res) \
typeof(a6) __a6 = a6; \
__declare_arg_5(a0, a1, a2, a3, a4, a5, res); \
register unsigned long r6 asm("r6") = __a6
#define __declare_arg_7(a0, a1, a2, a3, a4, a5, a6, a7, res) \
typeof(a7) __a7 = a7; \
__declare_arg_6(a0, a1, a2, a3, a4, a5, a6, res); \
register unsigned long r7 asm("r7") = __a7
#define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
#define __declare_args(count, ...) ___declare_args(count, __VA_ARGS__)
#define ___constraints(count) \
: __constraint_write_ ## count \
: __constraint_read_ ## count \
: "memory"
#define __constraints(count) ___constraints(count)
/*
* We have an output list that is not necessarily used, and GCC feels
* entitled to optimise the whole sequence away. "volatile" is what
* makes it stick.
*/
#define __arm_smccc_1_1(inst, ...) \
do { \
__declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
asm volatile(inst "\n" \
__constraints(__count_args(__VA_ARGS__))); \
if (___res) \
*___res = (typeof(*___res)){r0, r1, r2, r3}; \
} while (0)
/*
* arm_smccc_1_1_smc() - make an SMCCC v1.1 compliant SMC call
*
* This is a variadic macro taking one to eight source arguments, and
* an optional return structure.
*
* @a0-a7: arguments passed in registers 0 to 7
* @res: result values from registers 0 to 3
*
* This macro is used to make SMC calls following SMC Calling Convention v1.1.
* The content of the supplied param are copied to registers 0 to 7 prior
* to the SMC instruction. The return values are updated with the content
* from register 0 to 3 on return from the SMC instruction if not NULL.
*/
#define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__)
/*
* arm_smccc_1_1_hvc() - make an SMCCC v1.1 compliant HVC call
*
* This is a variadic macro taking one to eight source arguments, and
* an optional return structure.
*
* @a0-a7: arguments passed in registers 0 to 7
* @res: result values from registers 0 to 3
*
* This macro is used to make HVC calls following SMC Calling Convention v1.1.
* The content of the supplied param are copied to registers 0 to 7 prior
* to the HVC instruction. The return values are updated with the content
* from register 0 to 3 on return from the HVC instruction if not NULL.
*/
#define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
/*
* Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.
* Used when the SMCCC conduit is not defined. The empty asm statement
* avoids compiler warnings about unused variables.
*/
#define __fail_smccc_1_1(...) \
do { \
__declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
asm ("" __constraints(__count_args(__VA_ARGS__))); \
if (___res) \
___res->a0 = SMCCC_RET_NOT_SUPPORTED; \
} while (0)
/*
* arm_smccc_1_1_invoke() - make an SMCCC v1.1 compliant call
*
* This is a variadic macro taking one to eight source arguments, and
* an optional return structure.
*
* @a0-a7: arguments passed in registers 0 to 7
* @res: result values from registers 0 to 3
*
* This macro will make either an HVC call or an SMC call depending on the
* current SMCCC conduit. If no valid conduit is available then -1
* (SMCCC_RET_NOT_SUPPORTED) is returned in @res.a0 (if supplied).
*
* The return value also provides the conduit that was used.
*/
#define arm_smccc_1_1_invoke(...) ({ \
int method = arm_smccc_1_1_get_conduit(); \
switch (method) { \
case SMCCC_CONDUIT_HVC: \
arm_smccc_1_1_hvc(__VA_ARGS__); \
break; \
case SMCCC_CONDUIT_SMC: \
arm_smccc_1_1_smc(__VA_ARGS__); \
break; \
default: \
__fail_smccc_1_1(__VA_ARGS__); \
method = SMCCC_CONDUIT_NONE; \
break; \
} \
method; \
})
#endif /*__ASSEMBLY__*/
#endif /*__LINUX_ARM_SMCCC_H*/
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