Loading arch/arm64/configs/vendor/lahaina_QGKI.config +1 −0 Original line number Diff line number Diff line CONFIG_QCOM_SECURE_CHAN_MANAGER=y drivers/soc/qcom/Kconfig +8 −0 Original line number Diff line number Diff line Loading @@ -180,4 +180,12 @@ config QCOM_APR application processor and QDSP6. APR is used by audio driver to configure QDSP6 ASM, ADM and AFE modules. config QCOM_SECURE_CHAN_MANAGER tristate "Secure Channel Manager (SCM) support" help Say y or m here to enable Secure Channel Mananger (SCM) support for Qualcomm SoC. SCM provides communication channel to communicate with secure world (EL2 and EL3) by using smc call. endmenu drivers/soc/qcom/Makefile +2 −0 Original line number Diff line number Diff line Loading @@ -17,6 +17,8 @@ obj-$(CONFIG_QCOM_SMEM) += smem.o obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o obj-$(CONFIG_QCOM_SMP2P) += smp2p.o obj-$(CONFIG_QCOM_SMSM) += smsm.o CFLAGS_scm.o :=$(call as-instr,.arch_extension sec,-DREQUIRES_SEC=1, -Wno-asm-operand-widths) obj-$(CONFIG_QCOM_SECURE_CHAN_MANAGER) += scm.o obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o obj-$(CONFIG_QCOM_APR) += apr.o obj-$(CONFIG_QCOM_LLCC) += llcc-slice.o Loading drivers/soc/qcom/scm.c 0 → 100644 +623 −0 Original line number Diff line number Diff line // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2010-2019, The Linux Foundation. All rights reserved. */ #include <linux/slab.h> #include <linux/io.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/dma-mapping.h> #include <linux/platform_device.h> #include <linux/mod_devicetable.h> #include <soc/qcom/scm.h> #define CREATE_TRACE_POINTS #include <trace/events/scm.h> #ifdef CONFIG_ARM64 /* * This is used to ensure the compiler did actually allocate the register we * asked it for some inline assembly sequences. Apparently we can't trust the * compiler from one version to another so a bit of paranoia won't hurt. This * string is meant to be concatenated with the inline asm string and will * cause compilation to stop on mismatch. (for details, see gcc PR 15089) */ #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t" #else #include <asm/compiler.h> #include <asm/cacheflush.h> #endif #define SCM_ENOMEM -9 #define SCM_EINVAL_ADDR -3 #define SCM_EINVAL_ARG -2 #define SCM_ERROR -1 #define SCM_INTERRUPTED 1 #define SCM_V2_EBUSY -12 static DEFINE_MUTEX(scm_lock); #define SCM_EBUSY_WAIT_MS 30 #define SCM_EBUSY_MAX_RETRY 67 #define N_EXT_SCM_ARGS 7 #define FIRST_EXT_ARG_IDX 3 #define SMC_ATOMIC_SYSCALL 31 #define N_REGISTER_ARGS (MAX_SCM_ARGS - N_EXT_SCM_ARGS + 1) #define SMC64_MASK 0x40000000 #define SMC_ATOMIC_MASK 0x80000000 #define IS_CALL_AVAIL_CMD 1 #ifdef CONFIG_ARM64 #define R0_STR "x0" #define R1_STR "x1" #define R2_STR "x2" #define R3_STR "x3" #define R4_STR "x4" #define R5_STR "x5" #define R6_STR "x6" /* Outer caches unsupported on ARM64 platforms */ #define outer_flush_range(x, y) #else #define R0_STR "r0" #define R1_STR "r1" #define R2_STR "r2" #define R3_STR "r3" #define R4_STR "r4" #define R5_STR "r5" #define R6_STR "r6" #endif static struct device *qcom_scm_dev; struct scm_dma_buf { size_t size; dma_addr_t extra_arg_buf_phy; }; static int scm_remap_error(int err) { switch (err) { case SCM_ERROR: return -EOPNOTSUPP; case SCM_EINVAL_ADDR: case SCM_EINVAL_ARG: return -EINVAL; case SCM_ENOMEM: return -ENOMEM; case SCM_V2_EBUSY: return -EBUSY; } return -EINVAL; } #ifdef CONFIG_ARM64 static int __scm_call_armv8_64(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5, u64 *ret1, u64 *ret2, u64 *ret3) { register u64 r0 asm("x0") = x0; register u64 r1 asm("x1") = x1; register u64 r2 asm("x2") = x2; register u64 r3 asm("x3") = x3; register u64 r4 asm("x4") = x4; register u64 r5 asm("x5") = x5; register u64 r6 asm("x6") = 0; do { asm volatile( __asmeq("%0", R0_STR) __asmeq("%1", R1_STR) __asmeq("%2", R2_STR) __asmeq("%3", R3_STR) __asmeq("%4", R4_STR) __asmeq("%5", R5_STR) __asmeq("%6", R6_STR) __asmeq("%7", R0_STR) __asmeq("%8", R1_STR) __asmeq("%9", R2_STR) __asmeq("%10", R3_STR) __asmeq("%11", R4_STR) __asmeq("%12", R5_STR) __asmeq("%13", R6_STR) #ifdef REQUIRES_SEC ".arch_extension sec\n" #endif "smc #0\n" : "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3), "=r" (r4), "=r" (r5), "=r" (r6) : "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5), "r" (r6) : "x7", "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15", "x16", "x17"); } while (r0 == SCM_INTERRUPTED); if (ret1) *ret1 = r1; if (ret2) *ret2 = r2; if (ret3) *ret3 = r3; return r0; } static int __scm_call_armv8_32(u32 w0, u32 w1, u32 w2, u32 w3, u32 w4, u32 w5, u64 *ret1, u64 *ret2, u64 *ret3) { register u32 r0 asm("w0") = w0; register u32 r1 asm("w1") = w1; register u32 r2 asm("w2") = w2; register u32 r3 asm("w3") = w3; register u32 r4 asm("w4") = w4; register u32 r5 asm("w5") = w5; register u32 r6 asm("w6") = 0; do { asm volatile( __asmeq("%0", R0_STR) __asmeq("%1", R1_STR) __asmeq("%2", R2_STR) __asmeq("%3", R3_STR) __asmeq("%4", R4_STR) __asmeq("%5", R5_STR) __asmeq("%6", R6_STR) __asmeq("%7", R0_STR) __asmeq("%8", R1_STR) __asmeq("%9", R2_STR) __asmeq("%10", R3_STR) __asmeq("%11", R4_STR) __asmeq("%12", R5_STR) __asmeq("%13", R6_STR) #ifdef REQUIRES_SEC ".arch_extension sec\n" #endif "smc #0\n" : "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3), "=r" (r4), "=r" (r5), "=r" (r6) : "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5), "r" (r6) : "x7", "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15", "x16", "x17"); } while (r0 == SCM_INTERRUPTED); if (ret1) *ret1 = r1; if (ret2) *ret2 = r2; if (ret3) *ret3 = r3; return r0; } #else static int __scm_call_armv8_32(u32 w0, u32 w1, u32 w2, u32 w3, u32 w4, u32 w5, u64 *ret1, u64 *ret2, u64 *ret3) { register u32 r0 asm("r0") = w0; register u32 r1 asm("r1") = w1; register u32 r2 asm("r2") = w2; register u32 r3 asm("r3") = w3; register u32 r4 asm("r4") = w4; register u32 r5 asm("r5") = w5; register u32 r6 asm("r6") = 0; do { asm volatile( __asmeq("%0", R0_STR) __asmeq("%1", R1_STR) __asmeq("%2", R2_STR) __asmeq("%3", R3_STR) __asmeq("%4", R4_STR) __asmeq("%5", R5_STR) __asmeq("%6", R6_STR) __asmeq("%7", R0_STR) __asmeq("%8", R1_STR) __asmeq("%9", R2_STR) __asmeq("%10", R3_STR) __asmeq("%11", R4_STR) __asmeq("%12", R5_STR) __asmeq("%13", R6_STR) #ifdef REQUIRES_SEC ".arch_extension sec\n" #endif "smc #0\n" : "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3), "=r" (r4), "=r" (r5), "=r" (r6) : "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5), "r" (r6)); } while (r0 == SCM_INTERRUPTED); if (ret1) *ret1 = r1; if (ret2) *ret2 = r2; if (ret3) *ret3 = r3; return r0; } static int __scm_call_armv8_64(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5, u64 *ret1, u64 *ret2, u64 *ret3) { return 0; } #endif struct scm_extra_arg { union { u32 args32[N_EXT_SCM_ARGS]; u64 args64[N_EXT_SCM_ARGS]; }; }; static enum scm_interface_version { SCM_UNKNOWN, SCM_LEGACY, SCM_ARMV8_32, SCM_ARMV8_64, } scm_version = SCM_UNKNOWN; /* This will be set to specify SMC32 or SMC64 */ static u32 scm_version_mask; static noinline bool is_scm_armv8(void) { int ret; u64 ret1, x0; if (likely(scm_version != SCM_UNKNOWN)) return (scm_version == SCM_ARMV8_32) || (scm_version == SCM_ARMV8_64); /* * This is a one time check that runs on the first ever * invocation of is_scm_armv8. We might be called in atomic * context so no mutexes etc. Also, we can't use the scm_call2 * or scm_call2_APIs directly since they depend on this init. */ /* First try a SMC64 call */ scm_version = SCM_ARMV8_64; ret1 = 0; x0 = SCM_SIP_FNID(SCM_SVC_INFO, IS_CALL_AVAIL_CMD) | SMC_ATOMIC_MASK; ret = __scm_call_armv8_64(x0 | SMC64_MASK, SCM_ARGS(1), x0, 0, 0, 0, &ret1, NULL, NULL); if (ret || !ret1) { /* Try SMC32 call */ ret1 = 0; ret = __scm_call_armv8_32(x0, SCM_ARGS(1), x0, 0, 0, 0, &ret1, NULL, NULL); if (ret || !ret1) return -ENODEV; scm_version = SCM_ARMV8_32; } else scm_version_mask = SMC64_MASK; pr_debug("scm_call: scm version is %x, mask is %x\n", scm_version, scm_version_mask); return (scm_version == SCM_ARMV8_32) || (scm_version == SCM_ARMV8_64); } /* * If there are more than N_REGISTER_ARGS, allocate a buffer and place * the additional arguments in it. The extra argument buffer will be * pointed to by X5. */ static int allocate_extra_arg_buffer(struct scm_desc *desc, struct scm_dma_buf *scm_dma_buf, gfp_t flags) { int i, j; struct scm_extra_arg *argbuf; dma_addr_t argbuf_phy; int arglen = desc->arginfo & 0xf; size_t argbuflen = PAGE_ALIGN(sizeof(struct scm_extra_arg)); desc->x5 = desc->args[FIRST_EXT_ARG_IDX]; if (likely(arglen <= N_REGISTER_ARGS)) { desc->extra_arg_buf = NULL; return 0; } if (!qcom_scm_dev) return -EPROBE_DEFER; argbuf = kzalloc(argbuflen, flags); if (!argbuf) return -ENOMEM; desc->extra_arg_buf = argbuf; j = FIRST_EXT_ARG_IDX; if (scm_version == SCM_ARMV8_64) for (i = 0; i < N_EXT_SCM_ARGS; i++) argbuf->args64[i] = desc->args[j++]; else for (i = 0; i < N_EXT_SCM_ARGS; i++) argbuf->args32[i] = desc->args[j++]; desc->x5 = virt_to_phys(argbuf); argbuf_phy = dma_map_single(qcom_scm_dev, argbuf, argbuflen, DMA_TO_DEVICE); if (dma_mapping_error(qcom_scm_dev, argbuf_phy)) { kfree(argbuf); return -ENOMEM; } scm_dma_buf->extra_arg_buf_phy = argbuf_phy; scm_dma_buf->size = argbuflen; outer_flush_range(virt_to_phys(argbuf), virt_to_phys(argbuf) + argbuflen); return 0; } static int __scm_call2(u32 fn_id, struct scm_desc *desc, bool retry) { int arglen = desc->arginfo & 0xf; int ret, retry_count = 0; u64 x0; struct scm_dma_buf scm_dma_buf = {0}; ret = allocate_extra_arg_buffer(desc, &scm_dma_buf, GFP_NOIO); if (ret) return ret; x0 = fn_id | scm_version_mask; trace_scm_call_start(x0, desc); do { mutex_lock(&scm_lock); desc->ret[0] = desc->ret[1] = desc->ret[2] = 0; if (scm_version == SCM_ARMV8_64) ret = __scm_call_armv8_64(x0, desc->arginfo, desc->args[0], desc->args[1], desc->args[2], desc->x5, &desc->ret[0], &desc->ret[1], &desc->ret[2]); else ret = __scm_call_armv8_32(x0, desc->arginfo, desc->args[0], desc->args[1], desc->args[2], desc->x5, &desc->ret[0], &desc->ret[1], &desc->ret[2]); mutex_unlock(&scm_lock); if (!retry) goto out; if (ret == SCM_V2_EBUSY) msleep(SCM_EBUSY_WAIT_MS); if (retry_count == 33) pr_warn("scm: secure world has been busy for 1 second!\n"); } while (ret == SCM_V2_EBUSY && (retry_count++ < SCM_EBUSY_MAX_RETRY)); out: trace_scm_call_end(desc); if (ret < 0) pr_err("scm_call failed: func id %#llx, ret: %d, syscall returns: %#llx, %#llx, %#llx\n", x0, ret, desc->ret[0], desc->ret[1], desc->ret[2]); if (arglen > N_REGISTER_ARGS) { dma_unmap_single(qcom_scm_dev, scm_dma_buf.extra_arg_buf_phy, scm_dma_buf.size, DMA_TO_DEVICE); kfree(desc->extra_arg_buf); } if (ret < 0) return scm_remap_error(ret); return 0; } /** * scm_call2() - Invoke a syscall in the secure world * @fn_id: The function ID for this syscall * @desc: Descriptor structure containing arguments and return values * * Sends a command to the SCM and waits for the command to finish processing. * This should *only* be called in pre-emptible context. * * A note on cache maintenance: * Note that any buffers that are expected to be accessed by the secure world * must be flushed before invoking scm_call and invalidated in the cache * immediately after scm_call returns. An important point that must be noted * is that on ARMV8 architectures, invalidation actually also causes a dirty * cache line to be cleaned (flushed + unset-dirty-bit). Therefore it is of * paramount importance that the buffer be flushed before invoking scm_call2, * even if you don't care about the contents of that buffer. * * Note that cache maintenance on the argument buffer (desc->args) is taken care * of by scm_call2; however, callers are responsible for any other cached * buffers passed over to the secure world. */ int scm_call2(u32 fn_id, struct scm_desc *desc) { return __scm_call2(fn_id, desc, true); } EXPORT_SYMBOL(scm_call2); /** * scm_call2_noretry() - Invoke a syscall in the secure world * * Similar to scm_call2 except that there is no retry mechanism * implemented. */ int scm_call2_noretry(u32 fn_id, struct scm_desc *desc) { return __scm_call2(fn_id, desc, false); } EXPORT_SYMBOL(scm_call2_noretry); /** * scm_call2_atomic() - Invoke a syscall in the secure world * * Similar to scm_call2 except that this can be invoked in atomic context. * There is also no retry mechanism implemented. Please ensure that the * secure world syscall can be executed in such a context and can complete * in a timely manner. */ int scm_call2_atomic(u32 fn_id, struct scm_desc *desc) { int arglen = desc->arginfo & 0xf; int ret; u64 x0; struct scm_dma_buf scm_dma_buf = {0}; ret = allocate_extra_arg_buffer(desc, &scm_dma_buf, GFP_ATOMIC); if (ret) return ret; x0 = fn_id | BIT(SMC_ATOMIC_SYSCALL) | scm_version_mask; trace_scm_call_start(x0, desc); if (scm_version == SCM_ARMV8_64) ret = __scm_call_armv8_64(x0, desc->arginfo, desc->args[0], desc->args[1], desc->args[2], desc->x5, &desc->ret[0], &desc->ret[1], &desc->ret[2]); else ret = __scm_call_armv8_32(x0, desc->arginfo, desc->args[0], desc->args[1], desc->args[2], desc->x5, &desc->ret[0], &desc->ret[1], &desc->ret[2]); trace_scm_call_end(desc); if (ret < 0) pr_err("scm_call failed: func id %#llx, ret: %d, syscall returns: %#llx, %#llx, %#llx\n", x0, ret, desc->ret[0], desc->ret[1], desc->ret[2]); if (arglen > N_REGISTER_ARGS) { dma_unmap_single(qcom_scm_dev, scm_dma_buf.extra_arg_buf_phy, scm_dma_buf.size, DMA_TO_DEVICE); kfree(desc->extra_arg_buf); } if (ret < 0) return scm_remap_error(ret); return ret; } EXPORT_SYMBOL(scm_call2_atomic); #define SCM_IO_READ 0x1 #define SCM_IO_WRITE 0x2 u32 scm_io_read(phys_addr_t address) { struct scm_desc desc = { .args[0] = address, .arginfo = SCM_ARGS(1), }; scm_call2_atomic(SCM_SIP_FNID(SCM_SVC_IO, SCM_IO_READ), &desc); return desc.ret[0]; } EXPORT_SYMBOL(scm_io_read); int scm_io_write(phys_addr_t address, u32 val) { int ret; struct scm_desc desc = { .args[0] = address, .args[1] = val, .arginfo = SCM_ARGS(2), }; ret = scm_call2_atomic(SCM_SIP_FNID(SCM_SVC_IO, SCM_IO_WRITE), &desc); return ret; } EXPORT_SYMBOL(scm_io_write); int scm_is_call_available(u32 svc_id, u32 cmd_id) { int ret; struct scm_desc desc = {0}; desc.arginfo = SCM_ARGS(1); desc.args[0] = SCM_SIP_FNID(svc_id, cmd_id); ret = scm_call2(SCM_SIP_FNID(SCM_SVC_INFO, IS_CALL_AVAIL_CMD), &desc); if (ret) return ret; return desc.ret[0]; } EXPORT_SYMBOL(scm_is_call_available); #define GET_FEAT_VERSION_CMD 3 int scm_get_feat_version(u32 feat) { struct scm_desc desc = {0}; int ret; ret = scm_is_call_available(SCM_SVC_INFO, GET_FEAT_VERSION_CMD); if (ret <= 0) return 0; desc.args[0] = feat; desc.arginfo = SCM_ARGS(1); ret = scm_call2(SCM_SIP_FNID(SCM_SVC_INFO, GET_FEAT_VERSION_CMD), &desc); if (!ret) return desc.ret[0]; return 0; } EXPORT_SYMBOL(scm_get_feat_version); static int qcom_scm_probe(struct platform_device *pdev) { int ret = 0; if (unlikely(!is_scm_armv8())) { dev_err(&pdev->dev, "SCM ARMv8 not supported\n"); return -ENODEV; } qcom_scm_dev = &pdev->dev; #ifdef CONFIG_ARM64 ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); #endif return ret; } static const struct of_device_id qcom_scm_of_match[] = { { .compatible = "qcom,secure-chan-manager"}, {} }; MODULE_DEVICE_TABLE(of, qcom_scm_of_match); static struct platform_driver qcom_scm_driver = { .probe = qcom_scm_probe, .driver = { .name = "qcom_secure_chan_manager", .of_match_table = qcom_scm_of_match, }, }; module_platform_driver(qcom_scm_driver); MODULE_LICENSE("GPL v2"); include/soc/qcom/scm.h 0 → 100644 +141 −0 Original line number Diff line number Diff line /* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (c) 2010-2019, The Linux Foundation. All rights reserved. */ #ifndef __MACH_SCM_H #define __MACH_SCM_H #define SCM_SVC_BOOT 0x1 #define SCM_SVC_PIL 0x2 #define SCM_SVC_UTIL 0x3 #define SCM_SVC_TZ 0x4 #define SCM_SVC_IO 0x5 #define SCM_SVC_INFO 0x6 #define SCM_SVC_SSD 0x7 #define SCM_SVC_FUSE 0x8 #define SCM_SVC_PWR 0x9 #define SCM_SVC_MP 0xC #define SCM_SVC_DCVS 0xD #define SCM_SVC_ES 0x10 #define SCM_SVC_HDCP 0x11 #define SCM_SVC_MDTP 0x12 #define SCM_SVC_LMH 0x13 #define SCM_SVC_SMMU_PROGRAM 0x15 #define SCM_SVC_QDSS 0x16 #define SCM_SVC_RTIC 0x19 #define SCM_SVC_TZSCHEDULER 0xFC #define SCM_FUSE_READ 0x7 #define SCM_CMD_HDCP 0x01 /* SCM Features */ #define SCM_SVC_SEC_CAMERA 0xD #define DEFINE_SCM_BUFFER(__n) \ static char __n[PAGE_SIZE] __aligned(PAGE_SIZE) #define SCM_BUFFER_SIZE(__buf) sizeof(__buf) #define SCM_BUFFER_PHYS(__buf) virt_to_phys(__buf) #define SCM_SIP_FNID(s, c) (((((s) & 0xFF) << 8) | ((c) & 0xFF)) | 0x02000000) #define SCM_QSEEOS_FNID(s, c) (((((s) & 0xFF) << 8) | ((c) & 0xFF)) | \ 0x32000000) #define SCM_SVC_ID(s) (((s) & 0xFF00) >> 8) #define MAX_SCM_ARGS 10 #define MAX_SCM_RETS 3 enum scm_arg_types { SCM_VAL, SCM_RO, SCM_RW, SCM_BUFVAL, }; #define SCM_ARGS_IMPL(num, a, b, c, d, e, f, g, h, i, j, ...) (\ (((a) & 0xff) << 4) | \ (((b) & 0xff) << 6) | \ (((c) & 0xff) << 8) | \ (((d) & 0xff) << 10) | \ (((e) & 0xff) << 12) | \ (((f) & 0xff) << 14) | \ (((g) & 0xff) << 16) | \ (((h) & 0xff) << 18) | \ (((i) & 0xff) << 20) | \ (((j) & 0xff) << 22) | \ (num & 0xffff)) #define SCM_ARGS(...) SCM_ARGS_IMPL(__VA_ARGS__, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) /** * struct scm_desc * @arginfo: Metadata describing the arguments in args[] * @args: The array of arguments for the secure syscall * @ret: The values returned by the secure syscall * @extra_arg_buf: The buffer containing extra arguments (that don't fit in available registers) * @x5: The 4rd argument to the secure syscall or physical address of extra_arg_buf */ struct scm_desc { u32 arginfo; u64 args[MAX_SCM_ARGS]; u64 ret[MAX_SCM_RETS]; /* private */ void *extra_arg_buf; u64 x5; }; #if IS_ENABLED(CONFIG_QCOM_SECURE_CHAN_MANAGER) #define SCM_VERSION(major, minor) (((major) << 16) | ((minor) & 0xFF)) extern int scm_call2(u32 cmd_id, struct scm_desc *desc); extern int scm_call2_noretry(u32 cmd_id, struct scm_desc *desc); extern int scm_call2_atomic(u32 cmd_id, struct scm_desc *desc); extern int scm_is_call_available(u32 svc_id, u32 cmd_id); extern u32 scm_io_read(phys_addr_t address); extern int scm_io_write(phys_addr_t address, u32 val); extern int scm_get_feat_version(u32 feat); #else static inline int scm_call2(u32 cmd_id, struct scm_desc *desc) { return 0; } static inline int scm_call2_noretry(u32 cmd_id, struct scm_desc *desc) { return 0; } static inline int scm_call2_atomic(u32 cmd_id, struct scm_desc *desc) { return 0; } static inline int scm_get_feat_version(u32 feat) { return 0; } static inline int scm_is_call_available(u32 svc_id, u32 cmd_id) { return 0; } static inline u32 scm_io_read(phys_addr_t address) { return 0; } static inline int scm_io_write(phys_addr_t address, u32 val) { return 0; } #endif #endif Loading
arch/arm64/configs/vendor/lahaina_QGKI.config +1 −0 Original line number Diff line number Diff line CONFIG_QCOM_SECURE_CHAN_MANAGER=y
drivers/soc/qcom/Kconfig +8 −0 Original line number Diff line number Diff line Loading @@ -180,4 +180,12 @@ config QCOM_APR application processor and QDSP6. APR is used by audio driver to configure QDSP6 ASM, ADM and AFE modules. config QCOM_SECURE_CHAN_MANAGER tristate "Secure Channel Manager (SCM) support" help Say y or m here to enable Secure Channel Mananger (SCM) support for Qualcomm SoC. SCM provides communication channel to communicate with secure world (EL2 and EL3) by using smc call. endmenu
drivers/soc/qcom/Makefile +2 −0 Original line number Diff line number Diff line Loading @@ -17,6 +17,8 @@ obj-$(CONFIG_QCOM_SMEM) += smem.o obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o obj-$(CONFIG_QCOM_SMP2P) += smp2p.o obj-$(CONFIG_QCOM_SMSM) += smsm.o CFLAGS_scm.o :=$(call as-instr,.arch_extension sec,-DREQUIRES_SEC=1, -Wno-asm-operand-widths) obj-$(CONFIG_QCOM_SECURE_CHAN_MANAGER) += scm.o obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o obj-$(CONFIG_QCOM_APR) += apr.o obj-$(CONFIG_QCOM_LLCC) += llcc-slice.o Loading
drivers/soc/qcom/scm.c 0 → 100644 +623 −0 Original line number Diff line number Diff line // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2010-2019, The Linux Foundation. All rights reserved. */ #include <linux/slab.h> #include <linux/io.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/dma-mapping.h> #include <linux/platform_device.h> #include <linux/mod_devicetable.h> #include <soc/qcom/scm.h> #define CREATE_TRACE_POINTS #include <trace/events/scm.h> #ifdef CONFIG_ARM64 /* * This is used to ensure the compiler did actually allocate the register we * asked it for some inline assembly sequences. Apparently we can't trust the * compiler from one version to another so a bit of paranoia won't hurt. This * string is meant to be concatenated with the inline asm string and will * cause compilation to stop on mismatch. (for details, see gcc PR 15089) */ #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t" #else #include <asm/compiler.h> #include <asm/cacheflush.h> #endif #define SCM_ENOMEM -9 #define SCM_EINVAL_ADDR -3 #define SCM_EINVAL_ARG -2 #define SCM_ERROR -1 #define SCM_INTERRUPTED 1 #define SCM_V2_EBUSY -12 static DEFINE_MUTEX(scm_lock); #define SCM_EBUSY_WAIT_MS 30 #define SCM_EBUSY_MAX_RETRY 67 #define N_EXT_SCM_ARGS 7 #define FIRST_EXT_ARG_IDX 3 #define SMC_ATOMIC_SYSCALL 31 #define N_REGISTER_ARGS (MAX_SCM_ARGS - N_EXT_SCM_ARGS + 1) #define SMC64_MASK 0x40000000 #define SMC_ATOMIC_MASK 0x80000000 #define IS_CALL_AVAIL_CMD 1 #ifdef CONFIG_ARM64 #define R0_STR "x0" #define R1_STR "x1" #define R2_STR "x2" #define R3_STR "x3" #define R4_STR "x4" #define R5_STR "x5" #define R6_STR "x6" /* Outer caches unsupported on ARM64 platforms */ #define outer_flush_range(x, y) #else #define R0_STR "r0" #define R1_STR "r1" #define R2_STR "r2" #define R3_STR "r3" #define R4_STR "r4" #define R5_STR "r5" #define R6_STR "r6" #endif static struct device *qcom_scm_dev; struct scm_dma_buf { size_t size; dma_addr_t extra_arg_buf_phy; }; static int scm_remap_error(int err) { switch (err) { case SCM_ERROR: return -EOPNOTSUPP; case SCM_EINVAL_ADDR: case SCM_EINVAL_ARG: return -EINVAL; case SCM_ENOMEM: return -ENOMEM; case SCM_V2_EBUSY: return -EBUSY; } return -EINVAL; } #ifdef CONFIG_ARM64 static int __scm_call_armv8_64(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5, u64 *ret1, u64 *ret2, u64 *ret3) { register u64 r0 asm("x0") = x0; register u64 r1 asm("x1") = x1; register u64 r2 asm("x2") = x2; register u64 r3 asm("x3") = x3; register u64 r4 asm("x4") = x4; register u64 r5 asm("x5") = x5; register u64 r6 asm("x6") = 0; do { asm volatile( __asmeq("%0", R0_STR) __asmeq("%1", R1_STR) __asmeq("%2", R2_STR) __asmeq("%3", R3_STR) __asmeq("%4", R4_STR) __asmeq("%5", R5_STR) __asmeq("%6", R6_STR) __asmeq("%7", R0_STR) __asmeq("%8", R1_STR) __asmeq("%9", R2_STR) __asmeq("%10", R3_STR) __asmeq("%11", R4_STR) __asmeq("%12", R5_STR) __asmeq("%13", R6_STR) #ifdef REQUIRES_SEC ".arch_extension sec\n" #endif "smc #0\n" : "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3), "=r" (r4), "=r" (r5), "=r" (r6) : "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5), "r" (r6) : "x7", "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15", "x16", "x17"); } while (r0 == SCM_INTERRUPTED); if (ret1) *ret1 = r1; if (ret2) *ret2 = r2; if (ret3) *ret3 = r3; return r0; } static int __scm_call_armv8_32(u32 w0, u32 w1, u32 w2, u32 w3, u32 w4, u32 w5, u64 *ret1, u64 *ret2, u64 *ret3) { register u32 r0 asm("w0") = w0; register u32 r1 asm("w1") = w1; register u32 r2 asm("w2") = w2; register u32 r3 asm("w3") = w3; register u32 r4 asm("w4") = w4; register u32 r5 asm("w5") = w5; register u32 r6 asm("w6") = 0; do { asm volatile( __asmeq("%0", R0_STR) __asmeq("%1", R1_STR) __asmeq("%2", R2_STR) __asmeq("%3", R3_STR) __asmeq("%4", R4_STR) __asmeq("%5", R5_STR) __asmeq("%6", R6_STR) __asmeq("%7", R0_STR) __asmeq("%8", R1_STR) __asmeq("%9", R2_STR) __asmeq("%10", R3_STR) __asmeq("%11", R4_STR) __asmeq("%12", R5_STR) __asmeq("%13", R6_STR) #ifdef REQUIRES_SEC ".arch_extension sec\n" #endif "smc #0\n" : "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3), "=r" (r4), "=r" (r5), "=r" (r6) : "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5), "r" (r6) : "x7", "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15", "x16", "x17"); } while (r0 == SCM_INTERRUPTED); if (ret1) *ret1 = r1; if (ret2) *ret2 = r2; if (ret3) *ret3 = r3; return r0; } #else static int __scm_call_armv8_32(u32 w0, u32 w1, u32 w2, u32 w3, u32 w4, u32 w5, u64 *ret1, u64 *ret2, u64 *ret3) { register u32 r0 asm("r0") = w0; register u32 r1 asm("r1") = w1; register u32 r2 asm("r2") = w2; register u32 r3 asm("r3") = w3; register u32 r4 asm("r4") = w4; register u32 r5 asm("r5") = w5; register u32 r6 asm("r6") = 0; do { asm volatile( __asmeq("%0", R0_STR) __asmeq("%1", R1_STR) __asmeq("%2", R2_STR) __asmeq("%3", R3_STR) __asmeq("%4", R4_STR) __asmeq("%5", R5_STR) __asmeq("%6", R6_STR) __asmeq("%7", R0_STR) __asmeq("%8", R1_STR) __asmeq("%9", R2_STR) __asmeq("%10", R3_STR) __asmeq("%11", R4_STR) __asmeq("%12", R5_STR) __asmeq("%13", R6_STR) #ifdef REQUIRES_SEC ".arch_extension sec\n" #endif "smc #0\n" : "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3), "=r" (r4), "=r" (r5), "=r" (r6) : "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5), "r" (r6)); } while (r0 == SCM_INTERRUPTED); if (ret1) *ret1 = r1; if (ret2) *ret2 = r2; if (ret3) *ret3 = r3; return r0; } static int __scm_call_armv8_64(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5, u64 *ret1, u64 *ret2, u64 *ret3) { return 0; } #endif struct scm_extra_arg { union { u32 args32[N_EXT_SCM_ARGS]; u64 args64[N_EXT_SCM_ARGS]; }; }; static enum scm_interface_version { SCM_UNKNOWN, SCM_LEGACY, SCM_ARMV8_32, SCM_ARMV8_64, } scm_version = SCM_UNKNOWN; /* This will be set to specify SMC32 or SMC64 */ static u32 scm_version_mask; static noinline bool is_scm_armv8(void) { int ret; u64 ret1, x0; if (likely(scm_version != SCM_UNKNOWN)) return (scm_version == SCM_ARMV8_32) || (scm_version == SCM_ARMV8_64); /* * This is a one time check that runs on the first ever * invocation of is_scm_armv8. We might be called in atomic * context so no mutexes etc. Also, we can't use the scm_call2 * or scm_call2_APIs directly since they depend on this init. */ /* First try a SMC64 call */ scm_version = SCM_ARMV8_64; ret1 = 0; x0 = SCM_SIP_FNID(SCM_SVC_INFO, IS_CALL_AVAIL_CMD) | SMC_ATOMIC_MASK; ret = __scm_call_armv8_64(x0 | SMC64_MASK, SCM_ARGS(1), x0, 0, 0, 0, &ret1, NULL, NULL); if (ret || !ret1) { /* Try SMC32 call */ ret1 = 0; ret = __scm_call_armv8_32(x0, SCM_ARGS(1), x0, 0, 0, 0, &ret1, NULL, NULL); if (ret || !ret1) return -ENODEV; scm_version = SCM_ARMV8_32; } else scm_version_mask = SMC64_MASK; pr_debug("scm_call: scm version is %x, mask is %x\n", scm_version, scm_version_mask); return (scm_version == SCM_ARMV8_32) || (scm_version == SCM_ARMV8_64); } /* * If there are more than N_REGISTER_ARGS, allocate a buffer and place * the additional arguments in it. The extra argument buffer will be * pointed to by X5. */ static int allocate_extra_arg_buffer(struct scm_desc *desc, struct scm_dma_buf *scm_dma_buf, gfp_t flags) { int i, j; struct scm_extra_arg *argbuf; dma_addr_t argbuf_phy; int arglen = desc->arginfo & 0xf; size_t argbuflen = PAGE_ALIGN(sizeof(struct scm_extra_arg)); desc->x5 = desc->args[FIRST_EXT_ARG_IDX]; if (likely(arglen <= N_REGISTER_ARGS)) { desc->extra_arg_buf = NULL; return 0; } if (!qcom_scm_dev) return -EPROBE_DEFER; argbuf = kzalloc(argbuflen, flags); if (!argbuf) return -ENOMEM; desc->extra_arg_buf = argbuf; j = FIRST_EXT_ARG_IDX; if (scm_version == SCM_ARMV8_64) for (i = 0; i < N_EXT_SCM_ARGS; i++) argbuf->args64[i] = desc->args[j++]; else for (i = 0; i < N_EXT_SCM_ARGS; i++) argbuf->args32[i] = desc->args[j++]; desc->x5 = virt_to_phys(argbuf); argbuf_phy = dma_map_single(qcom_scm_dev, argbuf, argbuflen, DMA_TO_DEVICE); if (dma_mapping_error(qcom_scm_dev, argbuf_phy)) { kfree(argbuf); return -ENOMEM; } scm_dma_buf->extra_arg_buf_phy = argbuf_phy; scm_dma_buf->size = argbuflen; outer_flush_range(virt_to_phys(argbuf), virt_to_phys(argbuf) + argbuflen); return 0; } static int __scm_call2(u32 fn_id, struct scm_desc *desc, bool retry) { int arglen = desc->arginfo & 0xf; int ret, retry_count = 0; u64 x0; struct scm_dma_buf scm_dma_buf = {0}; ret = allocate_extra_arg_buffer(desc, &scm_dma_buf, GFP_NOIO); if (ret) return ret; x0 = fn_id | scm_version_mask; trace_scm_call_start(x0, desc); do { mutex_lock(&scm_lock); desc->ret[0] = desc->ret[1] = desc->ret[2] = 0; if (scm_version == SCM_ARMV8_64) ret = __scm_call_armv8_64(x0, desc->arginfo, desc->args[0], desc->args[1], desc->args[2], desc->x5, &desc->ret[0], &desc->ret[1], &desc->ret[2]); else ret = __scm_call_armv8_32(x0, desc->arginfo, desc->args[0], desc->args[1], desc->args[2], desc->x5, &desc->ret[0], &desc->ret[1], &desc->ret[2]); mutex_unlock(&scm_lock); if (!retry) goto out; if (ret == SCM_V2_EBUSY) msleep(SCM_EBUSY_WAIT_MS); if (retry_count == 33) pr_warn("scm: secure world has been busy for 1 second!\n"); } while (ret == SCM_V2_EBUSY && (retry_count++ < SCM_EBUSY_MAX_RETRY)); out: trace_scm_call_end(desc); if (ret < 0) pr_err("scm_call failed: func id %#llx, ret: %d, syscall returns: %#llx, %#llx, %#llx\n", x0, ret, desc->ret[0], desc->ret[1], desc->ret[2]); if (arglen > N_REGISTER_ARGS) { dma_unmap_single(qcom_scm_dev, scm_dma_buf.extra_arg_buf_phy, scm_dma_buf.size, DMA_TO_DEVICE); kfree(desc->extra_arg_buf); } if (ret < 0) return scm_remap_error(ret); return 0; } /** * scm_call2() - Invoke a syscall in the secure world * @fn_id: The function ID for this syscall * @desc: Descriptor structure containing arguments and return values * * Sends a command to the SCM and waits for the command to finish processing. * This should *only* be called in pre-emptible context. * * A note on cache maintenance: * Note that any buffers that are expected to be accessed by the secure world * must be flushed before invoking scm_call and invalidated in the cache * immediately after scm_call returns. An important point that must be noted * is that on ARMV8 architectures, invalidation actually also causes a dirty * cache line to be cleaned (flushed + unset-dirty-bit). Therefore it is of * paramount importance that the buffer be flushed before invoking scm_call2, * even if you don't care about the contents of that buffer. * * Note that cache maintenance on the argument buffer (desc->args) is taken care * of by scm_call2; however, callers are responsible for any other cached * buffers passed over to the secure world. */ int scm_call2(u32 fn_id, struct scm_desc *desc) { return __scm_call2(fn_id, desc, true); } EXPORT_SYMBOL(scm_call2); /** * scm_call2_noretry() - Invoke a syscall in the secure world * * Similar to scm_call2 except that there is no retry mechanism * implemented. */ int scm_call2_noretry(u32 fn_id, struct scm_desc *desc) { return __scm_call2(fn_id, desc, false); } EXPORT_SYMBOL(scm_call2_noretry); /** * scm_call2_atomic() - Invoke a syscall in the secure world * * Similar to scm_call2 except that this can be invoked in atomic context. * There is also no retry mechanism implemented. Please ensure that the * secure world syscall can be executed in such a context and can complete * in a timely manner. */ int scm_call2_atomic(u32 fn_id, struct scm_desc *desc) { int arglen = desc->arginfo & 0xf; int ret; u64 x0; struct scm_dma_buf scm_dma_buf = {0}; ret = allocate_extra_arg_buffer(desc, &scm_dma_buf, GFP_ATOMIC); if (ret) return ret; x0 = fn_id | BIT(SMC_ATOMIC_SYSCALL) | scm_version_mask; trace_scm_call_start(x0, desc); if (scm_version == SCM_ARMV8_64) ret = __scm_call_armv8_64(x0, desc->arginfo, desc->args[0], desc->args[1], desc->args[2], desc->x5, &desc->ret[0], &desc->ret[1], &desc->ret[2]); else ret = __scm_call_armv8_32(x0, desc->arginfo, desc->args[0], desc->args[1], desc->args[2], desc->x5, &desc->ret[0], &desc->ret[1], &desc->ret[2]); trace_scm_call_end(desc); if (ret < 0) pr_err("scm_call failed: func id %#llx, ret: %d, syscall returns: %#llx, %#llx, %#llx\n", x0, ret, desc->ret[0], desc->ret[1], desc->ret[2]); if (arglen > N_REGISTER_ARGS) { dma_unmap_single(qcom_scm_dev, scm_dma_buf.extra_arg_buf_phy, scm_dma_buf.size, DMA_TO_DEVICE); kfree(desc->extra_arg_buf); } if (ret < 0) return scm_remap_error(ret); return ret; } EXPORT_SYMBOL(scm_call2_atomic); #define SCM_IO_READ 0x1 #define SCM_IO_WRITE 0x2 u32 scm_io_read(phys_addr_t address) { struct scm_desc desc = { .args[0] = address, .arginfo = SCM_ARGS(1), }; scm_call2_atomic(SCM_SIP_FNID(SCM_SVC_IO, SCM_IO_READ), &desc); return desc.ret[0]; } EXPORT_SYMBOL(scm_io_read); int scm_io_write(phys_addr_t address, u32 val) { int ret; struct scm_desc desc = { .args[0] = address, .args[1] = val, .arginfo = SCM_ARGS(2), }; ret = scm_call2_atomic(SCM_SIP_FNID(SCM_SVC_IO, SCM_IO_WRITE), &desc); return ret; } EXPORT_SYMBOL(scm_io_write); int scm_is_call_available(u32 svc_id, u32 cmd_id) { int ret; struct scm_desc desc = {0}; desc.arginfo = SCM_ARGS(1); desc.args[0] = SCM_SIP_FNID(svc_id, cmd_id); ret = scm_call2(SCM_SIP_FNID(SCM_SVC_INFO, IS_CALL_AVAIL_CMD), &desc); if (ret) return ret; return desc.ret[0]; } EXPORT_SYMBOL(scm_is_call_available); #define GET_FEAT_VERSION_CMD 3 int scm_get_feat_version(u32 feat) { struct scm_desc desc = {0}; int ret; ret = scm_is_call_available(SCM_SVC_INFO, GET_FEAT_VERSION_CMD); if (ret <= 0) return 0; desc.args[0] = feat; desc.arginfo = SCM_ARGS(1); ret = scm_call2(SCM_SIP_FNID(SCM_SVC_INFO, GET_FEAT_VERSION_CMD), &desc); if (!ret) return desc.ret[0]; return 0; } EXPORT_SYMBOL(scm_get_feat_version); static int qcom_scm_probe(struct platform_device *pdev) { int ret = 0; if (unlikely(!is_scm_armv8())) { dev_err(&pdev->dev, "SCM ARMv8 not supported\n"); return -ENODEV; } qcom_scm_dev = &pdev->dev; #ifdef CONFIG_ARM64 ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); #endif return ret; } static const struct of_device_id qcom_scm_of_match[] = { { .compatible = "qcom,secure-chan-manager"}, {} }; MODULE_DEVICE_TABLE(of, qcom_scm_of_match); static struct platform_driver qcom_scm_driver = { .probe = qcom_scm_probe, .driver = { .name = "qcom_secure_chan_manager", .of_match_table = qcom_scm_of_match, }, }; module_platform_driver(qcom_scm_driver); MODULE_LICENSE("GPL v2");
include/soc/qcom/scm.h 0 → 100644 +141 −0 Original line number Diff line number Diff line /* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (c) 2010-2019, The Linux Foundation. All rights reserved. */ #ifndef __MACH_SCM_H #define __MACH_SCM_H #define SCM_SVC_BOOT 0x1 #define SCM_SVC_PIL 0x2 #define SCM_SVC_UTIL 0x3 #define SCM_SVC_TZ 0x4 #define SCM_SVC_IO 0x5 #define SCM_SVC_INFO 0x6 #define SCM_SVC_SSD 0x7 #define SCM_SVC_FUSE 0x8 #define SCM_SVC_PWR 0x9 #define SCM_SVC_MP 0xC #define SCM_SVC_DCVS 0xD #define SCM_SVC_ES 0x10 #define SCM_SVC_HDCP 0x11 #define SCM_SVC_MDTP 0x12 #define SCM_SVC_LMH 0x13 #define SCM_SVC_SMMU_PROGRAM 0x15 #define SCM_SVC_QDSS 0x16 #define SCM_SVC_RTIC 0x19 #define SCM_SVC_TZSCHEDULER 0xFC #define SCM_FUSE_READ 0x7 #define SCM_CMD_HDCP 0x01 /* SCM Features */ #define SCM_SVC_SEC_CAMERA 0xD #define DEFINE_SCM_BUFFER(__n) \ static char __n[PAGE_SIZE] __aligned(PAGE_SIZE) #define SCM_BUFFER_SIZE(__buf) sizeof(__buf) #define SCM_BUFFER_PHYS(__buf) virt_to_phys(__buf) #define SCM_SIP_FNID(s, c) (((((s) & 0xFF) << 8) | ((c) & 0xFF)) | 0x02000000) #define SCM_QSEEOS_FNID(s, c) (((((s) & 0xFF) << 8) | ((c) & 0xFF)) | \ 0x32000000) #define SCM_SVC_ID(s) (((s) & 0xFF00) >> 8) #define MAX_SCM_ARGS 10 #define MAX_SCM_RETS 3 enum scm_arg_types { SCM_VAL, SCM_RO, SCM_RW, SCM_BUFVAL, }; #define SCM_ARGS_IMPL(num, a, b, c, d, e, f, g, h, i, j, ...) (\ (((a) & 0xff) << 4) | \ (((b) & 0xff) << 6) | \ (((c) & 0xff) << 8) | \ (((d) & 0xff) << 10) | \ (((e) & 0xff) << 12) | \ (((f) & 0xff) << 14) | \ (((g) & 0xff) << 16) | \ (((h) & 0xff) << 18) | \ (((i) & 0xff) << 20) | \ (((j) & 0xff) << 22) | \ (num & 0xffff)) #define SCM_ARGS(...) SCM_ARGS_IMPL(__VA_ARGS__, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) /** * struct scm_desc * @arginfo: Metadata describing the arguments in args[] * @args: The array of arguments for the secure syscall * @ret: The values returned by the secure syscall * @extra_arg_buf: The buffer containing extra arguments (that don't fit in available registers) * @x5: The 4rd argument to the secure syscall or physical address of extra_arg_buf */ struct scm_desc { u32 arginfo; u64 args[MAX_SCM_ARGS]; u64 ret[MAX_SCM_RETS]; /* private */ void *extra_arg_buf; u64 x5; }; #if IS_ENABLED(CONFIG_QCOM_SECURE_CHAN_MANAGER) #define SCM_VERSION(major, minor) (((major) << 16) | ((minor) & 0xFF)) extern int scm_call2(u32 cmd_id, struct scm_desc *desc); extern int scm_call2_noretry(u32 cmd_id, struct scm_desc *desc); extern int scm_call2_atomic(u32 cmd_id, struct scm_desc *desc); extern int scm_is_call_available(u32 svc_id, u32 cmd_id); extern u32 scm_io_read(phys_addr_t address); extern int scm_io_write(phys_addr_t address, u32 val); extern int scm_get_feat_version(u32 feat); #else static inline int scm_call2(u32 cmd_id, struct scm_desc *desc) { return 0; } static inline int scm_call2_noretry(u32 cmd_id, struct scm_desc *desc) { return 0; } static inline int scm_call2_atomic(u32 cmd_id, struct scm_desc *desc) { return 0; } static inline int scm_get_feat_version(u32 feat) { return 0; } static inline int scm_is_call_available(u32 svc_id, u32 cmd_id) { return 0; } static inline u32 scm_io_read(phys_addr_t address) { return 0; } static inline int scm_io_write(phys_addr_t address, u32 val) { return 0; } #endif #endif
