From: Kumar Gala <galak@xxxxxxxxxxxxxx> Add an implementation of the SCM interface that works on ARM64 SoCs. This is used by things like determine if we have HDCP support or not on the system. Signed-off-by: Kumar Gala <galak@xxxxxxxxxxxxxx> Signed-off-by: Andy Gross <andy.gross@xxxxxxxxxx> --- drivers/firmware/qcom_scm-32.c | 4 + drivers/firmware/qcom_scm-64.c | 199 +++++++++++++++++++++++++++++++++++++++-- drivers/firmware/qcom_scm.c | 2 + drivers/firmware/qcom_scm.h | 5 ++ 4 files changed, 205 insertions(+), 5 deletions(-) diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c index e92bf7a..4971b55 100644 --- a/drivers/firmware/qcom_scm-32.c +++ b/drivers/firmware/qcom_scm-32.c @@ -420,3 +420,7 @@ int __qcom_scm_hdcp_req(struct device *dev, struct qcom_scm_hdcp_req *req, return qcom_scm_call(dev, QCOM_SCM_SVC_HDCP, QCOM_SCM_CMD_HDCP, req, req_cnt * sizeof(*req), resp, sizeof(*resp)); } + +void __qcom_scm_init(void) +{ +} diff --git a/drivers/firmware/qcom_scm-64.c b/drivers/firmware/qcom_scm-64.c index bb6555f..43ed4de 100644 --- a/drivers/firmware/qcom_scm-64.c +++ b/drivers/firmware/qcom_scm-64.c @@ -12,7 +12,143 @@ #include <linux/io.h> #include <linux/errno.h> +#include <linux/delay.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/types.h> #include <linux/qcom_scm.h> +#include <linux/arm-smccc.h> +#include <linux/dma-mapping.h> + +#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 + +#define QCOM_SCM_ARGS_IMPL(num, a, b, c, d, e, f, g, h, i, j, ...) (\ + (((a) & 0x3) << 4) | \ + (((b) & 0x3) << 6) | \ + (((c) & 0x3) << 8) | \ + (((d) & 0x3) << 10) | \ + (((e) & 0x3) << 12) | \ + (((f) & 0x3) << 14) | \ + (((g) & 0x3) << 16) | \ + (((h) & 0x3) << 18) | \ + (((i) & 0x3) << 20) | \ + (((j) & 0x3) << 22) | \ + (num & 0xf)) + +#define QCOM_SCM_ARGS(...) QCOM_SCM_ARGS_IMPL(__VA_ARGS__, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) + +/** + * struct qcom_scm_desc + * @arginfo: Metadata describing the arguments in args[] + * @args: The array of arguments for the secure syscall + * @res: The values returned by the secure syscall + */ +struct qcom_scm_desc { + u32 arginfo; + u64 args[MAX_QCOM_SCM_ARGS]; + struct arm_smccc_res res; +}; + +static u64 qcom_smccc_convention = -1; +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) + +/** + * qcom_scm_call() - Invoke a syscall in the secure world + * @dev: device + * @svc_id: service identifier + * @cmd_id: command identifier + * @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. +*/ +static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id, + struct qcom_scm_desc *desc) +{ + int arglen = desc->arginfo & 0xf; + int retry_count = 0, i; + u32 fn_id = QCOM_SCM_FNID(svc_id, cmd_id); + u64 cmd, x5 = desc->args[FIRST_EXT_ARG_IDX]; + dma_addr_t args_phys = 0; + void *args_virt = NULL; + size_t alloc_len; + + if (unlikely(arglen > N_REGISTER_ARGS)) { + alloc_len = N_EXT_QCOM_SCM_ARGS * sizeof(u64); + args_virt = kzalloc(PAGE_ALIGN(alloc_len), GFP_KERNEL); + + if (!args_virt) + return qcom_scm_remap_error(-ENOMEM); + + if (qcom_smccc_convention == ARM_SMCCC_SMC_32) { + __le32 *args = args_virt; + + for (i = 0; i < N_EXT_QCOM_SCM_ARGS; i++) + args[i] = cpu_to_le32(desc->args[i + + FIRST_EXT_ARG_IDX]); + } else { + __le64 *args = args_virt; + + for (i = 0; i < N_EXT_QCOM_SCM_ARGS; i++) + args[i] = cpu_to_le64(desc->args[i + + FIRST_EXT_ARG_IDX]); + } + + args_phys = dma_map_single(dev, args_virt, alloc_len, + DMA_TO_DEVICE); + + if (dma_mapping_error(dev, args_phys)) { + kfree(args_virt); + return qcom_scm_remap_error(-ENOMEM); + } + + x5 = args_phys; + } + + do { + mutex_lock(&qcom_scm_lock); + + cmd = ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, + qcom_smccc_convention, + ARM_SMCCC_OWNER_SIP, fn_id); + + do { + arm_smccc_smc(cmd, desc->arginfo, desc->args[0], + desc->args[1], desc->args[2], x5, 0, 0, + &desc->res); + } while (desc->res.a0 == QCOM_SCM_INTERRUPTED); + + mutex_unlock(&qcom_scm_lock); + + if (desc->res.a0 == QCOM_SCM_V2_EBUSY) { + if (retry_count++ > QCOM_SCM_EBUSY_MAX_RETRY) + break; + msleep(QCOM_SCM_EBUSY_WAIT_MS); + } + } while (desc->res.a0 == QCOM_SCM_V2_EBUSY); + + if (args_virt) { + dma_unmap_single(dev, args_phys, alloc_len, DMA_TO_DEVICE); + kfree(args_virt); + } + + if (desc->res.a0 < 0) + return qcom_scm_remap_error(desc->res.a0); + + return 0; +} /** * qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus @@ -29,13 +165,15 @@ int __qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus) /** * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus + * @dev: Device pointer * @entry: Entry point function for the cpus * @cpus: The cpumask of cpus that will use the entry point * * Set the Linux entry point for the SCM to transfer control to when coming * out of a power down. CPU power down may be executed on cpuidle or hotplug. */ -int __qcom_scm_set_warm_boot_addr(void *entry, const cpumask_t *cpus) +int __qcom_scm_set_warm_boot_addr(struct device *dev, void *entry, + const cpumask_t *cpus) { return -ENOTSUPP; } @@ -52,12 +190,63 @@ void __qcom_scm_cpu_power_down(u32 flags) { } -int __qcom_scm_is_call_available(u32 svc_id, u32 cmd_id) +int __qcom_scm_is_call_available(struct device *dev, u32 svc_id, u32 cmd_id) { - return -ENOTSUPP; + int ret; + struct qcom_scm_desc desc = {0}; + + desc.arginfo = QCOM_SCM_ARGS(1); + desc.args[0] = QCOM_SCM_FNID(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, + &desc); + + return ret ? : desc.res.a1; } -int __qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp) +int __qcom_scm_hdcp_req(struct device *dev, struct qcom_scm_hdcp_req *req, + u32 req_cnt, u32 *resp) { - return -ENOTSUPP; + int ret; + struct qcom_scm_desc desc = {0}; + + if (req_cnt > QCOM_SCM_HDCP_MAX_REQ_CNT) + return -ERANGE; + + desc.args[0] = req[0].addr; + desc.args[1] = req[0].val; + desc.args[2] = req[1].addr; + desc.args[3] = req[1].val; + desc.args[4] = req[2].addr; + desc.args[5] = req[2].val; + desc.args[6] = req[3].addr; + desc.args[7] = req[3].val; + desc.args[8] = req[4].addr; + desc.args[9] = req[4].val; + desc.arginfo = QCOM_SCM_ARGS(10); + + ret = qcom_scm_call(dev, QCOM_SCM_SVC_HDCP, QCOM_SCM_CMD_HDCP, &desc); + *resp = desc.res.a1; + + return ret; +} + +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); + + /* First try a SMC64 call */ + cmd = ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_64, + ARM_SMCCC_OWNER_SIP, function); + + arm_smccc_smc(cmd, QCOM_SCM_ARGS(1), cmd & (~BIT(ARM_SMCCC_TYPE_SHIFT)), + 0, 0, 0, 0, 0, &res); + + if (!res.a0 && res.a1) + qcom_smccc_convention = ARM_SMCCC_SMC_64; + else + qcom_smccc_convention = ARM_SMCCC_SMC_32; } diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c index 23ccec6..475410b3e 100644 --- a/drivers/firmware/qcom_scm.c +++ b/drivers/firmware/qcom_scm.c @@ -189,6 +189,8 @@ static int qcom_scm_probe(struct platform_device *pdev) __scm = scm; __scm->dev = &pdev->dev; + __qcom_scm_init(); + return 0; } diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h index afe6676..0ea55d7 100644 --- a/drivers/firmware/qcom_scm.h +++ b/drivers/firmware/qcom_scm.h @@ -38,7 +38,10 @@ extern int __qcom_scm_is_call_available(struct device *dev, u32 svc_id, extern int __qcom_scm_hdcp_req(struct device *dev, struct qcom_scm_hdcp_req *req, u32 req_cnt, u32 *resp); +extern void __qcom_scm_init(void); + /* common error codes */ +#define QCOM_SCM_V2_EBUSY -12 #define QCOM_SCM_ENOMEM -5 #define QCOM_SCM_EOPNOTSUPP -4 #define QCOM_SCM_EINVAL_ADDR -3 @@ -58,6 +61,8 @@ static inline int qcom_scm_remap_error(int err) return -EOPNOTSUPP; case QCOM_SCM_ENOMEM: return -ENOMEM; + case QCOM_SCM_V2_EBUSY: + return -EBUSY; } return -EINVAL; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html