diff options
Diffstat (limited to 'drivers/firmware/arm_scmi')
| -rw-r--r-- | drivers/firmware/arm_scmi/Makefile | 4 | ||||
| -rw-r--r-- | drivers/firmware/arm_scmi/base.c | 7 | ||||
| -rw-r--r-- | drivers/firmware/arm_scmi/common.h | 11 | ||||
| -rw-r--r-- | drivers/firmware/arm_scmi/driver.c | 133 | ||||
| -rw-r--r-- | drivers/firmware/arm_scmi/mailbox.c | 17 | ||||
| -rw-r--r-- | drivers/firmware/arm_scmi/perf.c | 5 | ||||
| -rw-r--r-- | drivers/firmware/arm_scmi/power.c | 6 | ||||
| -rw-r--r-- | drivers/firmware/arm_scmi/sensors.c | 4 | ||||
| -rw-r--r-- | drivers/firmware/arm_scmi/shmem.c | 15 | ||||
| -rw-r--r-- | drivers/firmware/arm_scmi/smc.c | 153 |
10 files changed, 326 insertions, 29 deletions
diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile index 6694d0d908d6..1cad32b38b29 100644 --- a/drivers/firmware/arm_scmi/Makefile +++ b/drivers/firmware/arm_scmi/Makefile @@ -2,6 +2,8 @@ obj-y = scmi-bus.o scmi-driver.o scmi-protocols.o scmi-transport.o scmi-bus-y = bus.o scmi-driver-y = driver.o -scmi-transport-y = mailbox.o shmem.o +scmi-transport-y = shmem.o +scmi-transport-$(CONFIG_MAILBOX) += mailbox.o +scmi-transport-$(CONFIG_ARM_PSCI_FW) += smc.o scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o diff --git a/drivers/firmware/arm_scmi/base.c b/drivers/firmware/arm_scmi/base.c index f804e8af6521..ce7d9203e41b 100644 --- a/drivers/firmware/arm_scmi/base.c +++ b/drivers/firmware/arm_scmi/base.c @@ -14,6 +14,13 @@ enum scmi_base_protocol_cmd { BASE_DISCOVER_LIST_PROTOCOLS = 0x6, BASE_DISCOVER_AGENT = 0x7, BASE_NOTIFY_ERRORS = 0x8, + BASE_SET_DEVICE_PERMISSIONS = 0x9, + BASE_SET_PROTOCOL_PERMISSIONS = 0xa, + BASE_RESET_AGENT_CONFIGURATION = 0xb, +}; + +enum scmi_base_protocol_notify { + BASE_ERROR_EVENT = 0x0, }; struct scmi_msg_resp_base_attributes { diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h index 5ac06469b01c..31fe5a22a011 100644 --- a/drivers/firmware/arm_scmi/common.h +++ b/drivers/firmware/arm_scmi/common.h @@ -178,6 +178,8 @@ struct scmi_chan_info { * @send_message: Callback to send a message * @mark_txdone: Callback to mark tx as done * @fetch_response: Callback to fetch response + * @fetch_notification: Callback to fetch notification + * @clear_channel: Callback to clear a channel * @poll_done: Callback to poll transfer status */ struct scmi_transport_ops { @@ -190,6 +192,9 @@ struct scmi_transport_ops { void (*mark_txdone)(struct scmi_chan_info *cinfo, int ret); void (*fetch_response)(struct scmi_chan_info *cinfo, struct scmi_xfer *xfer); + void (*fetch_notification)(struct scmi_chan_info *cinfo, + size_t max_len, struct scmi_xfer *xfer); + void (*clear_channel)(struct scmi_chan_info *cinfo); bool (*poll_done)(struct scmi_chan_info *cinfo, struct scmi_xfer *xfer); }; @@ -210,6 +215,9 @@ struct scmi_desc { }; extern const struct scmi_desc scmi_mailbox_desc; +#ifdef CONFIG_HAVE_ARM_SMCCC +extern const struct scmi_desc scmi_smc_desc; +#endif void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr); void scmi_free_channel(struct scmi_chan_info *cinfo, struct idr *idr, int id); @@ -222,5 +230,8 @@ void shmem_tx_prepare(struct scmi_shared_mem __iomem *shmem, u32 shmem_read_header(struct scmi_shared_mem __iomem *shmem); void shmem_fetch_response(struct scmi_shared_mem __iomem *shmem, struct scmi_xfer *xfer); +void shmem_fetch_notification(struct scmi_shared_mem __iomem *shmem, + size_t max_len, struct scmi_xfer *xfer); +void shmem_clear_channel(struct scmi_shared_mem __iomem *shmem); bool shmem_poll_done(struct scmi_shared_mem __iomem *shmem, struct scmi_xfer *xfer); diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index dbec767222e9..7483cacf63f9 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -76,6 +76,7 @@ struct scmi_xfers_info { * implementation version and (sub-)vendor identification. * @handle: Instance of SCMI handle to send to clients * @tx_minfo: Universal Transmit Message management info + * @rx_minfo: Universal Receive Message management info * @tx_idr: IDR object to map protocol id to Tx channel info pointer * @rx_idr: IDR object to map protocol id to Rx channel info pointer * @protocols_imp: List of protocols implemented, currently maximum of @@ -89,6 +90,7 @@ struct scmi_info { struct scmi_revision_info version; struct scmi_handle handle; struct scmi_xfers_info tx_minfo; + struct scmi_xfers_info rx_minfo; struct idr tx_idr; struct idr rx_idr; u8 *protocols_imp; @@ -200,37 +202,66 @@ __scmi_xfer_put(struct scmi_xfers_info *minfo, struct scmi_xfer *xfer) spin_unlock_irqrestore(&minfo->xfer_lock, flags); } -/** - * scmi_rx_callback() - callback for receiving messages - * - * @cinfo: SCMI channel info - * @msg_hdr: Message header - * - * Processes one received message to appropriate transfer information and - * signals completion of the transfer. - * - * NOTE: This function will be invoked in IRQ context, hence should be - * as optimal as possible. - */ -void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr) +static void scmi_handle_notification(struct scmi_chan_info *cinfo, u32 msg_hdr) { - struct scmi_info *info = handle_to_scmi_info(cinfo->handle); - struct scmi_xfers_info *minfo = &info->tx_minfo; - u16 xfer_id = MSG_XTRACT_TOKEN(msg_hdr); - u8 msg_type = MSG_XTRACT_TYPE(msg_hdr); - struct device *dev = cinfo->dev; struct scmi_xfer *xfer; + struct device *dev = cinfo->dev; + struct scmi_info *info = handle_to_scmi_info(cinfo->handle); + struct scmi_xfers_info *minfo = &info->rx_minfo; - if (msg_type == MSG_TYPE_NOTIFICATION) - return; /* Notifications not yet supported */ + xfer = scmi_xfer_get(cinfo->handle, minfo); + if (IS_ERR(xfer)) { + dev_err(dev, "failed to get free message slot (%ld)\n", + PTR_ERR(xfer)); + info->desc->ops->clear_channel(cinfo); + return; + } + + unpack_scmi_header(msg_hdr, &xfer->hdr); + scmi_dump_header_dbg(dev, &xfer->hdr); + info->desc->ops->fetch_notification(cinfo, info->desc->max_msg_size, + xfer); + + trace_scmi_rx_done(xfer->transfer_id, xfer->hdr.id, + xfer->hdr.protocol_id, xfer->hdr.seq, + MSG_TYPE_NOTIFICATION); + + __scmi_xfer_put(minfo, xfer); + + info->desc->ops->clear_channel(cinfo); +} + +static void scmi_handle_response(struct scmi_chan_info *cinfo, + u16 xfer_id, u8 msg_type) +{ + struct scmi_xfer *xfer; + struct device *dev = cinfo->dev; + struct scmi_info *info = handle_to_scmi_info(cinfo->handle); + struct scmi_xfers_info *minfo = &info->tx_minfo; /* Are we even expecting this? */ if (!test_bit(xfer_id, minfo->xfer_alloc_table)) { dev_err(dev, "message for %d is not expected!\n", xfer_id); + info->desc->ops->clear_channel(cinfo); return; } xfer = &minfo->xfer_block[xfer_id]; + /* + * Even if a response was indeed expected on this slot at this point, + * a buggy platform could wrongly reply feeding us an unexpected + * delayed response we're not prepared to handle: bail-out safely + * blaming firmware. + */ + if (unlikely(msg_type == MSG_TYPE_DELAYED_RESP && !xfer->async_done)) { + dev_err(dev, + "Delayed Response for %d not expected! Buggy F/W ?\n", + xfer_id); + info->desc->ops->clear_channel(cinfo); + /* It was unexpected, so nobody will clear the xfer if not us */ + __scmi_xfer_put(minfo, xfer); + return; + } scmi_dump_header_dbg(dev, &xfer->hdr); @@ -240,10 +271,43 @@ void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr) xfer->hdr.protocol_id, xfer->hdr.seq, msg_type); - if (msg_type == MSG_TYPE_DELAYED_RESP) + if (msg_type == MSG_TYPE_DELAYED_RESP) { + info->desc->ops->clear_channel(cinfo); complete(xfer->async_done); - else + } else { complete(&xfer->done); + } +} + +/** + * scmi_rx_callback() - callback for receiving messages + * + * @cinfo: SCMI channel info + * @msg_hdr: Message header + * + * Processes one received message to appropriate transfer information and + * signals completion of the transfer. + * + * NOTE: This function will be invoked in IRQ context, hence should be + * as optimal as possible. + */ +void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr) +{ + u16 xfer_id = MSG_XTRACT_TOKEN(msg_hdr); + u8 msg_type = MSG_XTRACT_TYPE(msg_hdr); + + switch (msg_type) { + case MSG_TYPE_NOTIFICATION: + scmi_handle_notification(cinfo, msg_hdr); + break; + case MSG_TYPE_COMMAND: + case MSG_TYPE_DELAYED_RESP: + scmi_handle_response(cinfo, xfer_id, msg_type); + break; + default: + WARN_ONCE(1, "received unknown msg_type:%d\n", msg_type); + break; + } } /** @@ -525,13 +589,13 @@ int scmi_handle_put(const struct scmi_handle *handle) return 0; } -static int scmi_xfer_info_init(struct scmi_info *sinfo) +static int __scmi_xfer_info_init(struct scmi_info *sinfo, + struct scmi_xfers_info *info) { int i; struct scmi_xfer *xfer; struct device *dev = sinfo->dev; const struct scmi_desc *desc = sinfo->desc; - struct scmi_xfers_info *info = &sinfo->tx_minfo; /* Pre-allocated messages, no more than what hdr.seq can support */ if (WARN_ON(desc->max_msg >= MSG_TOKEN_MAX)) { @@ -566,6 +630,16 @@ static int scmi_xfer_info_init(struct scmi_info *sinfo) return 0; } +static int scmi_xfer_info_init(struct scmi_info *sinfo) +{ + int ret = __scmi_xfer_info_init(sinfo, &sinfo->tx_minfo); + + if (!ret && idr_find(&sinfo->rx_idr, SCMI_PROTOCOL_BASE)) + ret = __scmi_xfer_info_init(sinfo, &sinfo->rx_minfo); + + return ret; +} + static int scmi_chan_setup(struct scmi_info *info, struct device *dev, int prot_id, bool tx) { @@ -699,10 +773,6 @@ static int scmi_probe(struct platform_device *pdev) info->desc = desc; INIT_LIST_HEAD(&info->node); - ret = scmi_xfer_info_init(info); - if (ret) - return ret; - platform_set_drvdata(pdev, info); idr_init(&info->tx_idr); idr_init(&info->rx_idr); @@ -715,6 +785,10 @@ static int scmi_probe(struct platform_device *pdev) if (ret) return ret; + ret = scmi_xfer_info_init(info); + if (ret) + return ret; + ret = scmi_base_protocol_init(handle); if (ret) { dev_err(dev, "unable to communicate with SCMI(%d)\n", ret); @@ -827,6 +901,9 @@ ATTRIBUTE_GROUPS(versions); /* Each compatible listed below must have descriptor associated with it */ static const struct of_device_id scmi_of_match[] = { { .compatible = "arm,scmi", .data = &scmi_mailbox_desc }, +#ifdef CONFIG_ARM_PSCI_FW + { .compatible = "arm,scmi-smc", .data = &scmi_smc_desc}, +#endif { /* Sentinel */ }, }; diff --git a/drivers/firmware/arm_scmi/mailbox.c b/drivers/firmware/arm_scmi/mailbox.c index 73077bbc4ad9..6998dc86b5ce 100644 --- a/drivers/firmware/arm_scmi/mailbox.c +++ b/drivers/firmware/arm_scmi/mailbox.c @@ -158,6 +158,21 @@ static void mailbox_fetch_response(struct scmi_chan_info *cinfo, shmem_fetch_response(smbox->shmem, xfer); } +static void mailbox_fetch_notification(struct scmi_chan_info *cinfo, + size_t max_len, struct scmi_xfer *xfer) +{ + struct scmi_mailbox *smbox = cinfo->transport_info; + + shmem_fetch_notification(smbox->shmem, max_len, xfer); +} + +static void mailbox_clear_channel(struct scmi_chan_info *cinfo) +{ + struct scmi_mailbox *smbox = cinfo->transport_info; + + shmem_clear_channel(smbox->shmem); +} + static bool mailbox_poll_done(struct scmi_chan_info *cinfo, struct scmi_xfer *xfer) { @@ -173,6 +188,8 @@ static struct scmi_transport_ops scmi_mailbox_ops = { .send_message = mailbox_send_message, .mark_txdone = mailbox_mark_txdone, .fetch_response = mailbox_fetch_response, + .fetch_notification = mailbox_fetch_notification, + .clear_channel = mailbox_clear_channel, .poll_done = mailbox_poll_done, }; diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c index 34f3a917dd8d..eadc171e254b 100644 --- a/drivers/firmware/arm_scmi/perf.c +++ b/drivers/firmware/arm_scmi/perf.c @@ -27,6 +27,11 @@ enum scmi_performance_protocol_cmd { PERF_DESCRIBE_FASTCHANNEL = 0xb, }; +enum scmi_performance_protocol_notify { + PERFORMANCE_LIMITS_CHANGED = 0x0, + PERFORMANCE_LEVEL_CHANGED = 0x1, +}; + struct scmi_opp { u32 perf; u32 power; diff --git a/drivers/firmware/arm_scmi/power.c b/drivers/firmware/arm_scmi/power.c index 214886ce84f1..cf7f0312381b 100644 --- a/drivers/firmware/arm_scmi/power.c +++ b/drivers/firmware/arm_scmi/power.c @@ -12,6 +12,12 @@ enum scmi_power_protocol_cmd { POWER_STATE_SET = 0x4, POWER_STATE_GET = 0x5, POWER_STATE_NOTIFY = 0x6, + POWER_STATE_CHANGE_REQUESTED_NOTIFY = 0x7, +}; + +enum scmi_power_protocol_notify { + POWER_STATE_CHANGED = 0x0, + POWER_STATE_CHANGE_REQUESTED = 0x1, }; struct scmi_msg_resp_power_attributes { diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c index eba61b9c1f53..db1b1ab303da 100644 --- a/drivers/firmware/arm_scmi/sensors.c +++ b/drivers/firmware/arm_scmi/sensors.c @@ -14,6 +14,10 @@ enum scmi_sensor_protocol_cmd { SENSOR_READING_GET = 0x6, }; +enum scmi_sensor_protocol_notify { + SENSOR_TRIP_POINT_EVENT = 0x0, +}; + struct scmi_msg_resp_sensor_attributes { __le16 num_sensors; u8 max_requests; diff --git a/drivers/firmware/arm_scmi/shmem.c b/drivers/firmware/arm_scmi/shmem.c index e1e816e0018c..0e3eaea5d852 100644 --- a/drivers/firmware/arm_scmi/shmem.c +++ b/drivers/firmware/arm_scmi/shmem.c @@ -67,6 +67,21 @@ void shmem_fetch_response(struct scmi_shared_mem __iomem *shmem, memcpy_fromio(xfer->rx.buf, shmem->msg_payload + 4, xfer->rx.len); } +void shmem_fetch_notification(struct scmi_shared_mem __iomem *shmem, + size_t max_len, struct scmi_xfer *xfer) +{ + /* Skip only the length of header in shmem area i.e 4 bytes */ + xfer->rx.len = min_t(size_t, max_len, ioread32(&shmem->length) - 4); + + /* Take a copy to the rx buffer.. */ + memcpy_fromio(xfer->rx.buf, shmem->msg_payload, xfer->rx.len); +} + +void shmem_clear_channel(struct scmi_shared_mem __iomem *shmem) +{ + iowrite32(SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE, &shmem->channel_status); +} + bool shmem_poll_done(struct scmi_shared_mem __iomem *shmem, struct scmi_xfer *xfer) { diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c new file mode 100644 index 000000000000..49bc4b0e8428 --- /dev/null +++ b/drivers/firmware/arm_scmi/smc.c @@ -0,0 +1,153 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * System Control and Management Interface (SCMI) Message SMC/HVC + * Transport driver + * + * Copyright 2020 NXP + */ + +#include <linux/arm-smccc.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/slab.h> + +#include "common.h" + +/** + * struct scmi_smc - Structure representing a SCMI smc transport + * + * @cinfo: SCMI channel info + * @shmem: Transmit/Receive shared memory area + * @func_id: smc/hvc call function id + */ + +struct scmi_smc { + struct scmi_chan_info *cinfo; + struct scmi_shared_mem __iomem *shmem; + struct mutex shmem_lock; + u32 func_id; +}; + +static bool smc_chan_available(struct device *dev, int idx) +{ + struct device_node *np = of_parse_phandle(dev->of_node, "shmem", 0); + if (!np) + return false; + + of_node_put(np); + return true; +} + +static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev, + bool tx) +{ + struct device *cdev = cinfo->dev; + struct scmi_smc *scmi_info; + resource_size_t size; + struct resource res; + struct device_node *np; + u32 func_id; + int ret; + + if (!tx) + return -ENODEV; + + scmi_info = devm_kzalloc(dev, sizeof(*scmi_info), GFP_KERNEL); + if (!scmi_info) + return -ENOMEM; + + np = of_parse_phandle(cdev->of_node, "shmem", 0); + ret = of_address_to_resource(np, 0, &res); + of_node_put(np); + if (ret) { + dev_err(cdev, "failed to get SCMI Tx shared memory\n"); + return ret; + } + + size = resource_size(&res); + scmi_info->shmem = devm_ioremap(dev, res.start, size); + if (!scmi_info->shmem) { + dev_err(dev, "failed to ioremap SCMI Tx shared memory\n"); + return -EADDRNOTAVAIL; + } + + ret = of_property_read_u32(dev->of_node, "arm,smc-id", &func_id); + if (ret < 0) + return ret; + + scmi_info->func_id = func_id; + scmi_info->cinfo = cinfo; + mutex_init(&scmi_info->shmem_lock); + cinfo->transport_info = scmi_info; + + return 0; +} + +static int smc_chan_free(int id, void *p, void *data) +{ + struct scmi_chan_info *cinfo = p; + struct scmi_smc *scmi_info = cinfo->transport_info; + + cinfo->transport_info = NULL; + scmi_info->cinfo = NULL; + + scmi_free_channel(cinfo, data, id); + + return 0; +} + +static int smc_send_message(struct scmi_chan_info *cinfo, + struct scmi_xfer *xfer) +{ + struct scmi_smc *scmi_info = cinfo->transport_info; + struct arm_smccc_res res; + + mutex_lock(&scmi_info->shmem_lock); + + shmem_tx_prepare(scmi_info->shmem, xfer); + + arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res); + scmi_rx_callback(scmi_info->cinfo, shmem_read_header(scmi_info->shmem)); + + mutex_unlock(&scmi_info->shmem_lock); + + /* Only SMCCC_RET_NOT_SUPPORTED is valid error code */ + if (res.a0) + return -EOPNOTSUPP; + return 0; +} + +static void smc_fetch_response(struct scmi_chan_info *cinfo, + struct scmi_xfer *xfer) +{ + struct scmi_smc *scmi_info = cinfo->transport_info; + + shmem_fetch_response(scmi_info->shmem, xfer); +} + +static bool +smc_poll_done(struct scmi_chan_info *cinfo, struct scmi_xfer *xfer) +{ + struct scmi_smc *scmi_info = cinfo->transport_info; + + return shmem_poll_done(scmi_info->shmem, xfer); +} + +static struct scmi_transport_ops scmi_smc_ops = { + .chan_available = smc_chan_available, + .chan_setup = smc_chan_setup, + .chan_free = smc_chan_free, + .send_message = smc_send_message, + .fetch_response = smc_fetch_response, + .poll_done = smc_poll_done, +}; + +const struct scmi_desc scmi_smc_desc = { + .ops = &scmi_smc_ops, + .max_rx_timeout_ms = 30, + .max_msg = 1, + .max_msg_size = 128, +}; |