diff options
Diffstat (limited to 'drivers/firmware/arm_scmi/smc.c')
| -rw-r--r-- | drivers/firmware/arm_scmi/smc.c | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c deleted file mode 100644 index 4effecc3bb46..000000000000 --- a/drivers/firmware/arm_scmi/smc.c +++ /dev/null @@ -1,198 +0,0 @@ -// 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/interrupt.h> -#include <linux/mutex.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <linux/of_irq.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 - * @shmem_lock: Lock to protect access to Tx/Rx shared memory area - * @func_id: smc/hvc call function id - * @irq: Optional; employed when platforms indicates msg completion by intr. - * @tx_complete: Optional, employed only when irq is valid. - */ - -struct scmi_smc { - struct scmi_chan_info *cinfo; - struct scmi_shared_mem __iomem *shmem; - struct mutex shmem_lock; - u32 func_id; - int irq; - struct completion tx_complete; -}; - -static irqreturn_t smc_msg_done_isr(int irq, void *data) -{ - struct scmi_smc *scmi_info = data; - - complete(&scmi_info->tx_complete); - - return IRQ_HANDLED; -} - -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, irq; - - 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); - if (!of_device_is_compatible(np, "arm,scmi-shmem")) - return -ENXIO; - - 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; - - /* - * If there is an interrupt named "a2p", then the service and - * completion of a message is signaled by an interrupt rather than by - * the return of the SMC call. - */ - irq = of_irq_get_byname(cdev->of_node, "a2p"); - if (irq > 0) { - ret = devm_request_irq(dev, irq, smc_msg_done_isr, - IRQF_NO_SUSPEND, - dev_name(dev), scmi_info); - if (ret) { - dev_err(dev, "failed to setup SCMI smc irq\n"); - return ret; - } - init_completion(&scmi_info->tx_complete); - scmi_info->irq = irq; - } - - 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); - - if (scmi_info->irq) - reinit_completion(&scmi_info->tx_complete); - - arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res); - - if (scmi_info->irq) - wait_for_completion(&scmi_info->tx_complete); - - scmi_rx_callback(scmi_info->cinfo, - shmem_read_header(scmi_info->shmem), NULL); - - 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 const 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 = 20, - .max_msg_size = 128, -}; |