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smcinvoke: Call correct apis on basis of device tree entry

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Before the advent of cache coherent buffers, cmd_id 0 was
used for invoke functionality that required CMO operations.
On later targets which support cache coherent buffer, a new
cmd_id 0x2 was used that eliminated the need for CMO operations.
However, some targets such as MDM still dont support cache
coherent buffers. So we still have to use older command i.e.
cmd_id 0. This decision is taken by reading the property from
dtsi entry and accordingly call the legcay api inside scm driver.

Change-Id: I71f25ecc21d663331a40ddb8bdfeb75f21449292
Signed-off-by: Anmolpreet Kaur <anmolpre@codeaurora.org>
This commit is contained in:
Anmolpreet Kaur 2021-02-09 23:56:44 +05:30
commit 038c930a1d
1 changed files with 16 additions and 5 deletions
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21
drivers/soc/qcom/smcinvoke.c
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@ -21,6 +21,7 @@
#include <linux/kref.h>
#include <linux/signal.h>
#include <linux/msm_ion.h>
#include <linux/of_platform.h>
#include <linux/qcom_scm.h>
#include <asm/cacheflush.h>
@ -50,6 +51,7 @@
/* TZ defined values - Start */
#define SMCINVOKE_INVOKE_PARAM_ID 0x224
#define SMCINVOKE_CB_RSP_PARAM_ID 0x22
#define SMCINVOKE_INVOKE_CMD_LEGACY 0x32000600
#define SMCINVOKE_INVOKE_CMD 0x32000602
#define SMCINVOKE_CB_RSP_CMD 0x32000601
#define SMCINVOKE_RESULT_INBOUND_REQ_NEEDED 3
@ -144,6 +146,7 @@ static uint16_t g_last_cb_server_id = CBOBJ_SERVER_ID_START;
static uint16_t g_last_mem_rgn_id, g_last_mem_map_obj_id;
static size_t g_max_cb_buf_size = SMCINVOKE_TZ_MIN_BUF_SIZE;
static unsigned int cb_reqs_inflight;
static bool legacy_smc_call;
static long smcinvoke_ioctl(struct file *, unsigned int, unsigned long);
static int smcinvoke_open(struct inode *, struct file *);
@ -1228,7 +1231,10 @@ static int prepare_send_scm_msg(const uint8_t *in_buf, phys_addr_t in_paddr,
if ((in_buf_len % PAGE_SIZE) != 0 || (out_buf_len % PAGE_SIZE) != 0)
return -EINVAL;
cmd = SMCINVOKE_INVOKE_CMD;
if (legacy_smc_call)
cmd = SMCINVOKE_INVOKE_CMD_LEGACY;
else
cmd = SMCINVOKE_INVOKE_CMD;
/*
* purpose of lock here is to ensure that any CB obj that may be going
* to user as OO is not released by piggyback message on another invoke
@ -1241,11 +1247,14 @@ static int prepare_send_scm_msg(const uint8_t *in_buf, phys_addr_t in_paddr,
while (1) {
mutex_lock(&g_smcinvoke_lock);
if (cmd == SMCINVOKE_INVOKE_CMD)
if (cmd == SMCINVOKE_INVOKE_CMD_LEGACY)
ret = qcom_scm_invoke_smc_legacy(in_paddr, in_buf_len,
out_paddr, out_buf_len,
&req->result, &response_type, &data);
else if (cmd == SMCINVOKE_INVOKE_CMD)
ret = qcom_scm_invoke_smc(in_paddr, in_buf_len,
out_paddr, out_buf_len,
&req->result, &response_type,
&data);
out_paddr, out_buf_len,
&req->result, &response_type, &data);
else
ret = qcom_scm_invoke_callback_response(
virt_to_phys(out_buf), out_buf_len,
@ -2071,6 +2080,8 @@ static int smcinvoke_probe(struct platform_device *pdev)
pr_err("dma_set_mask_and_coherent failed %d\n", rc);
goto exit_destroy_device;
}
legacy_smc_call = of_property_read_bool((&pdev->dev)->of_node,
"qcom,support-legacy_smc");
return 0;