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Subject[PATCH 01/17] firmware: qcom_scm: Rename macros and structures
Date
- Rename legacy-specific structures and macros with "legacy_" prefix.
- Rename smccc-specific structures and macros with "smccc_" prefix.
- Flip calculation of SMCCC_N_EXT_ARGS to be a function of N_REG_ARGS
(not the other way around). N_REG_ARGS is fixed based off the SMC
instruction and shouldn't be computed from the SCM abstraction.
- Move SMCCC_FUNCNUM closer to other smccc-specific macros.
- Add LEGACY_FUNCNUM macro to qcom_scm-32.c

Signed-off-by: Elliot Berman <eberman@codeaurora.org>
---
drivers/firmware/qcom_scm-32.c | 72 ++++++++++++++++++++++--------------------
drivers/firmware/qcom_scm-64.c | 54 +++++++++++++++----------------
drivers/firmware/qcom_scm.c | 4 +--
3 files changed, 65 insertions(+), 65 deletions(-)

diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
index bee8729..d416efc 100644
--- a/drivers/firmware/qcom_scm-32.c
+++ b/drivers/firmware/qcom_scm-32.c
@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2010,2015, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2010,2015,2019 The Linux Foundation. All rights reserved.
* Copyright (C) 2015 Linaro Ltd.
*/

@@ -38,23 +38,25 @@ static struct qcom_scm_entry qcom_scm_wb[] = {

static DEFINE_MUTEX(qcom_scm_lock);

+#define LEGACY_FUNCNUM(s, c) (((s) << 10) | ((c) & 0x3ff))
+
/**
- * struct qcom_scm_command - one SCM command buffer
+ * struct legacy_command - one SCM command buffer
* @len: total available memory for command and response
* @buf_offset: start of command buffer
* @resp_hdr_offset: start of response buffer
* @id: command to be executed
- * @buf: buffer returned from qcom_scm_get_command_buffer()
+ * @buf: buffer returned from legacy_get_command_buffer()
*
* An SCM command is laid out in memory as follows:
*
- * ------------------- <--- struct qcom_scm_command
+ * ------------------- <--- struct legacy_command
* | command header |
- * ------------------- <--- qcom_scm_get_command_buffer()
+ * ------------------- <--- legacy_get_command_buffer()
* | command buffer |
- * ------------------- <--- struct qcom_scm_response and
- * | response header | qcom_scm_command_to_response()
- * ------------------- <--- qcom_scm_get_response_buffer()
+ * ------------------- <--- struct legacy_response and
+ * | response header | legacy_command_to_response()
+ * ------------------- <--- legacy_get_response_buffer()
* | response buffer |
* -------------------
*
@@ -62,7 +64,7 @@ static DEFINE_MUTEX(qcom_scm_lock);
* you should always use the appropriate qcom_scm_get_*_buffer() routines
* to access the buffers in a safe manner.
*/
-struct qcom_scm_command {
+struct legacy_command {
__le32 len;
__le32 buf_offset;
__le32 resp_hdr_offset;
@@ -71,52 +73,52 @@ struct qcom_scm_command {
};

/**
- * struct qcom_scm_response - one SCM response buffer
+ * struct legacy_response - one SCM response buffer
* @len: total available memory for response
- * @buf_offset: start of response data relative to start of qcom_scm_response
+ * @buf_offset: start of response data relative to start of legacy_response
* @is_complete: indicates if the command has finished processing
*/
-struct qcom_scm_response {
+struct legacy_response {
__le32 len;
__le32 buf_offset;
__le32 is_complete;
};

/**
- * qcom_scm_command_to_response() - Get a pointer to a qcom_scm_response
+ * legacy_command_to_response() - Get a pointer to a legacy_response
* @cmd: command
*
* Returns a pointer to a response for a command.
*/
-static inline struct qcom_scm_response *qcom_scm_command_to_response(
- const struct qcom_scm_command *cmd)
+static inline struct legacy_response *legacy_command_to_response(
+ const struct legacy_command *cmd)
{
return (void *)cmd + le32_to_cpu(cmd->resp_hdr_offset);
}

/**
- * qcom_scm_get_command_buffer() - Get a pointer to a command buffer
+ * legacy_get_command_buffer() - Get a pointer to a command buffer
* @cmd: command
*
* Returns a pointer to the command buffer of a command.
*/
-static inline void *qcom_scm_get_command_buffer(const struct qcom_scm_command *cmd)
+static inline void *legacy_get_command_buffer(const struct legacy_command *cmd)
{
return (void *)cmd->buf;
}

/**
- * qcom_scm_get_response_buffer() - Get a pointer to a response buffer
+ * legacy_get_response_buffer() - Get a pointer to a response buffer
* @rsp: response
*
* Returns a pointer to a response buffer of a response.
*/
-static inline void *qcom_scm_get_response_buffer(const struct qcom_scm_response *rsp)
+static inline void *legacy_get_response_buffer(const struct legacy_response *rsp)
{
return (void *)rsp + le32_to_cpu(rsp->buf_offset);
}

-static u32 smc(u32 cmd_addr)
+static u32 __qcom_scm_call_do(u32 cmd_addr)
{
int context_id;
register u32 r0 asm("r0") = 1;
@@ -164,8 +166,8 @@ static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
size_t resp_len)
{
int ret;
- struct qcom_scm_command *cmd;
- struct qcom_scm_response *rsp;
+ struct legacy_command *cmd;
+ struct legacy_response *rsp;
size_t alloc_len = sizeof(*cmd) + cmd_len + sizeof(*rsp) + resp_len;
dma_addr_t cmd_phys;

@@ -177,11 +179,11 @@ static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
cmd->buf_offset = cpu_to_le32(sizeof(*cmd));
cmd->resp_hdr_offset = cpu_to_le32(sizeof(*cmd) + cmd_len);

- cmd->id = cpu_to_le32((svc_id << 10) | cmd_id);
+ cmd->id = cpu_to_le32(LEGACY_FUNCNUM(svc_id, cmd_id));
if (cmd_buf)
- memcpy(qcom_scm_get_command_buffer(cmd), cmd_buf, cmd_len);
+ memcpy(legacy_get_command_buffer(cmd), cmd_buf, cmd_len);

- rsp = qcom_scm_command_to_response(cmd);
+ rsp = legacy_command_to_response(cmd);

cmd_phys = dma_map_single(dev, cmd, alloc_len, DMA_TO_DEVICE);
if (dma_mapping_error(dev, cmd_phys)) {
@@ -190,7 +192,7 @@ static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
}

mutex_lock(&qcom_scm_lock);
- ret = smc(cmd_phys);
+ ret = __qcom_scm_call_do(cmd_phys);
if (ret < 0)
ret = qcom_scm_remap_error(ret);
mutex_unlock(&qcom_scm_lock);
@@ -206,7 +208,7 @@ static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
dma_sync_single_for_cpu(dev, cmd_phys + sizeof(*cmd) + cmd_len +
le32_to_cpu(rsp->buf_offset),
resp_len, DMA_FROM_DEVICE);
- memcpy(resp_buf, qcom_scm_get_response_buffer(rsp),
+ memcpy(resp_buf, legacy_get_response_buffer(rsp),
resp_len);
}
out:
@@ -215,12 +217,12 @@ static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
return ret;
}

-#define SCM_CLASS_REGISTER (0x2 << 8)
-#define SCM_MASK_IRQS BIT(5)
-#define SCM_ATOMIC(svc, cmd, n) (((((svc) << 10)|((cmd) & 0x3ff)) << 12) | \
- SCM_CLASS_REGISTER | \
- SCM_MASK_IRQS | \
- (n & 0xf))
+#define LEGACY_CLASS_REGISTER (0x2 << 8)
+#define LEGACY_MASK_IRQS BIT(5)
+#define LEGACY_ATOMIC(svc, cmd, n) ((LEGACY_FUNCNUM(svc, cmd) << 12) | \
+ LEGACY_CLASS_REGISTER | \
+ LEGACY_MASK_IRQS | \
+ (n & 0xf))

/**
* qcom_scm_call_atomic1() - Send an atomic SCM command with one argument
@@ -235,7 +237,7 @@ static s32 qcom_scm_call_atomic1(u32 svc, u32 cmd, u32 arg1)
{
int context_id;

- register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 1);
+ register u32 r0 asm("r0") = LEGACY_ATOMIC(svc, cmd, 1);
register u32 r1 asm("r1") = (u32)&context_id;
register u32 r2 asm("r2") = arg1;

@@ -268,7 +270,7 @@ static s32 qcom_scm_call_atomic2(u32 svc, u32 cmd, u32 arg1, u32 arg2)
{
int context_id;

- register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 2);
+ register u32 r0 asm("r0") = LEGACY_ATOMIC(svc, cmd, 2);
register u32 r1 asm("r1") = (u32)&context_id;
register u32 r2 asm("r2") = arg1;
register u32 r3 asm("r3") = arg2;
diff --git a/drivers/firmware/qcom_scm-64.c b/drivers/firmware/qcom_scm-64.c
index 7686786..e6721b5 100644
--- a/drivers/firmware/qcom_scm-64.c
+++ b/drivers/firmware/qcom_scm-64.c
@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2015,2019 The Linux Foundation. All rights reserved.
*/

#include <linux/io.h>
@@ -14,8 +14,6 @@

#include "qcom_scm.h"

-#define QCOM_SCM_FNID(s, c) ((((s) & 0xFF) << 8) | ((c) & 0xFF))
-
#define MAX_QCOM_SCM_ARGS 10
#define MAX_QCOM_SCM_RETS 3

@@ -58,11 +56,12 @@ static DEFINE_MUTEX(qcom_scm_lock);
#define QCOM_SCM_EBUSY_WAIT_MS 30
#define QCOM_SCM_EBUSY_MAX_RETRY 20

-#define N_EXT_QCOM_SCM_ARGS 7
-#define FIRST_EXT_ARG_IDX 3
-#define N_REGISTER_ARGS (MAX_QCOM_SCM_ARGS - N_EXT_QCOM_SCM_ARGS + 1)
+#define SMCCC_FUNCNUM(s, c) ((((s) & 0xFF) << 8) | ((c) & 0xFF))
+#define SMCCC_N_REG_ARGS 4
+#define SMCCC_FIRST_REG_IDX 2
+#define SMCCC_N_EXT_ARGS (MAX_QCOM_SCM_ARGS - SMCCC_N_REG_ARGS + 1)

-static void __qcom_scm_call_do(const struct qcom_scm_desc *desc,
+static void __qcom_scm_call_do_quirk(const struct qcom_scm_desc *desc,
struct arm_smccc_res *res, u32 fn_id,
u64 x5, u32 type)
{
@@ -85,22 +84,23 @@ static void __qcom_scm_call_do(const struct qcom_scm_desc *desc,
} while (res->a0 == QCOM_SCM_INTERRUPTED);
}

-static void qcom_scm_call_do(const struct qcom_scm_desc *desc,
+static void qcom_scm_call_do_smccc(const struct qcom_scm_desc *desc,
struct arm_smccc_res *res, u32 fn_id,
u64 x5, bool atomic)
{
int retry_count = 0;

if (atomic) {
- __qcom_scm_call_do(desc, res, fn_id, x5, ARM_SMCCC_FAST_CALL);
+ __qcom_scm_call_do_quirk(desc, res, fn_id, x5,
+ ARM_SMCCC_FAST_CALL);
return;
}

do {
mutex_lock(&qcom_scm_lock);

- __qcom_scm_call_do(desc, res, fn_id, x5,
- ARM_SMCCC_STD_CALL);
+ __qcom_scm_call_do_quirk(desc, res, fn_id, x5,
+ ARM_SMCCC_STD_CALL);

mutex_unlock(&qcom_scm_lock);

@@ -112,21 +112,21 @@ static void qcom_scm_call_do(const struct qcom_scm_desc *desc,
} while (res->a0 == QCOM_SCM_V2_EBUSY);
}

-static int ___qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
- const struct qcom_scm_desc *desc,
- struct arm_smccc_res *res, bool atomic)
+static int ___qcom_scm_call_smccc(struct device *dev, u32 svc_id, u32 cmd_id,
+ const struct qcom_scm_desc *desc,
+ struct arm_smccc_res *res, bool atomic)
{
int arglen = desc->arginfo & 0xf;
int i;
- u32 fn_id = QCOM_SCM_FNID(svc_id, cmd_id);
- u64 x5 = desc->args[FIRST_EXT_ARG_IDX];
+ u32 fn_id = SMCCC_FUNCNUM(svc_id, cmd_id);
+ u64 x5 = desc->args[SMCCC_N_REG_ARGS - 1];
dma_addr_t args_phys = 0;
void *args_virt = NULL;
size_t alloc_len;
gfp_t flag = atomic ? GFP_ATOMIC : GFP_KERNEL;

- if (unlikely(arglen > N_REGISTER_ARGS)) {
- alloc_len = N_EXT_QCOM_SCM_ARGS * sizeof(u64);
+ if (unlikely(arglen > SMCCC_N_REG_ARGS)) {
+ alloc_len = SMCCC_N_EXT_ARGS * sizeof(u64);
args_virt = kzalloc(PAGE_ALIGN(alloc_len), flag);

if (!args_virt)
@@ -135,15 +135,15 @@ static int ___qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
if (qcom_smccc_convention == ARM_SMCCC_SMC_32) {
__le32 *args = args_virt;

- for (i = 0; i < N_EXT_QCOM_SCM_ARGS; i++)
+ for (i = 0; i < SMCCC_N_EXT_ARGS; i++)
args[i] = cpu_to_le32(desc->args[i +
- FIRST_EXT_ARG_IDX]);
+ SMCCC_N_REG_ARGS - 1]);
} else {
__le64 *args = args_virt;

- for (i = 0; i < N_EXT_QCOM_SCM_ARGS; i++)
+ for (i = 0; i < SMCCC_N_EXT_ARGS; i++)
args[i] = cpu_to_le64(desc->args[i +
- FIRST_EXT_ARG_IDX]);
+ SMCCC_N_REG_ARGS - 1]);
}

args_phys = dma_map_single(dev, args_virt, alloc_len,
@@ -157,7 +157,7 @@ static int ___qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
x5 = args_phys;
}

- qcom_scm_call_do(desc, res, fn_id, x5, atomic);
+ qcom_scm_call_do_smccc(desc, res, fn_id, x5, atomic);

if (args_virt) {
dma_unmap_single(dev, args_phys, alloc_len, DMA_TO_DEVICE);
@@ -185,7 +185,7 @@ static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
struct arm_smccc_res *res)
{
might_sleep();
- return ___qcom_scm_call(dev, svc_id, cmd_id, desc, res, false);
+ return ___qcom_scm_call_smccc(dev, svc_id, cmd_id, desc, res, false);
}

/**
@@ -203,7 +203,7 @@ static int qcom_scm_call_atomic(struct device *dev, u32 svc_id, u32 cmd_id,
const struct qcom_scm_desc *desc,
struct arm_smccc_res *res)
{
- return ___qcom_scm_call(dev, svc_id, cmd_id, desc, res, true);
+ return ___qcom_scm_call_smccc(dev, svc_id, cmd_id, desc, res, true);
}

/**
@@ -253,7 +253,7 @@ int __qcom_scm_is_call_available(struct device *dev, u32 svc_id, u32 cmd_id)
struct arm_smccc_res res;

desc.arginfo = QCOM_SCM_ARGS(1);
- desc.args[0] = QCOM_SCM_FNID(svc_id, cmd_id) |
+ desc.args[0] = SMCCC_FUNCNUM(svc_id, cmd_id) |
(ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT);

ret = qcom_scm_call(dev, QCOM_SCM_SVC_INFO, QCOM_IS_CALL_AVAIL_CMD,
@@ -295,7 +295,7 @@ void __qcom_scm_init(void)
{
u64 cmd;
struct arm_smccc_res res;
- u32 function = QCOM_SCM_FNID(QCOM_SCM_SVC_INFO, QCOM_IS_CALL_AVAIL_CMD);
+ u32 function = SMCCC_FUNCNUM(QCOM_SCM_SVC_INFO, QCOM_IS_CALL_AVAIL_CMD);

/* First try a SMC64 call */
cmd = ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_64,
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index a729e05..40222b1 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -1,8 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * Qualcomm SCM driver
- *
- * Copyright (c) 2010,2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2010,2015,2019 The Linux Foundation. All rights reserved.
* Copyright (C) 2015 Linaro Ltd.
*/
#include <linux/platform_device.h>
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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