1 files changed, 0 insertions, 277 deletions
diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c
deleted file mode 100644
index c193516a254d..000000000000
--- a/drivers/firmware/arm_scmi/smc.c
+++ /dev/null
@@ -1,277 +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/atomic.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/processor.h>
-#include <linux/slab.h>
-
-#include "common.h"
-
-/*
- * The shmem address is split into 4K page and offset.
- * This is to make sure the parameters fit in 32bit arguments of the
- * smc/hvc call to keep it uniform across smc32/smc64 conventions.
- * This however limits the shmem address to 44 bit.
- *
- * These optional parameters can be used to distinguish among multiple
- * scmi instances that are using the same smc-id.
- * The page parameter is passed in r1/x1/w1 register and the offset parameter
- * is passed in r2/x2/w2 register.
- */
-
-#define SHMEM_SIZE (SZ_4K)
-#define SHMEM_SHIFT 12
-#define SHMEM_PAGE(x) (_UL((x) >> SHMEM_SHIFT))
-#define SHMEM_OFFSET(x) ((x) & (SHMEM_SIZE - 1))
-
-/**
- * struct scmi_smc - Structure representing a SCMI smc transport
- *
- * @irq: An optional IRQ for completion
- * @cinfo: SCMI channel info
- * @shmem: Transmit/Receive shared memory area
- * @shmem_lock: Lock to protect access to Tx/Rx shared memory area.
- *		Used when NOT operating in atomic mode.
- * @inflight: Atomic flag to protect access to Tx/Rx shared memory area.
- *	      Used when operating in atomic mode.
- * @func_id: smc/hvc call function id
- * @param_page: 4K page number of the shmem channel
- * @param_offset: Offset within the 4K page of the shmem channel
- */
-
-struct scmi_smc {
-	int irq;
-	struct scmi_chan_info *cinfo;
-	struct scmi_shared_mem __iomem *shmem;
-	/* Protect access to shmem area */
-	struct mutex shmem_lock;
-#define INFLIGHT_NONE	MSG_TOKEN_MAX
-	atomic_t inflight;
-	u32 func_id;
-	u32 param_page;
-	u32 param_offset;
-};
-
-static irqreturn_t smc_msg_done_isr(int irq, void *data)
-{
-	struct scmi_smc *scmi_info = data;
-
-	scmi_rx_callback(scmi_info->cinfo,
-			 shmem_read_header(scmi_info->shmem), NULL);
-
-	return IRQ_HANDLED;
-}
-
-static bool smc_chan_available(struct device_node *of_node, int idx)
-{
-	struct device_node *np = of_parse_phandle(of_node, "shmem", 0);
-	if (!np)
-		return false;
-
-	of_node_put(np);
-	return true;
-}
-
-static inline void smc_channel_lock_init(struct scmi_smc *scmi_info)
-{
-	if (IS_ENABLED(CONFIG_ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE))
-		atomic_set(&scmi_info->inflight, INFLIGHT_NONE);
-	else
-		mutex_init(&scmi_info->shmem_lock);
-}
-
-static bool smc_xfer_inflight(struct scmi_xfer *xfer, atomic_t *inflight)
-{
-	int ret;
-
-	ret = atomic_cmpxchg(inflight, INFLIGHT_NONE, xfer->hdr.seq);
-
-	return ret == INFLIGHT_NONE;
-}
-
-static inline void
-smc_channel_lock_acquire(struct scmi_smc *scmi_info,
-			 struct scmi_xfer *xfer __maybe_unused)
-{
-	if (IS_ENABLED(CONFIG_ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE))
-		spin_until_cond(smc_xfer_inflight(xfer, &scmi_info->inflight));
-	else
-		mutex_lock(&scmi_info->shmem_lock);
-}
-
-static inline void smc_channel_lock_release(struct scmi_smc *scmi_info)
-{
-	if (IS_ENABLED(CONFIG_ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE))
-		atomic_set(&scmi_info->inflight, INFLIGHT_NONE);
-	else
-		mutex_unlock(&scmi_info->shmem_lock);
-}
-
-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);
-	if (!of_device_is_compatible(np, "arm,scmi-shmem")) {
-		of_node_put(np);
-		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 (of_device_is_compatible(dev->of_node, "arm,scmi-smc-param")) {
-		scmi_info->param_page = SHMEM_PAGE(res.start);
-		scmi_info->param_offset = SHMEM_OFFSET(res.start);
-	}
-	/*
-	 * 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.
-	 */
-	scmi_info->irq = of_irq_get_byname(cdev->of_node, "a2p");
-	if (scmi_info->irq > 0) {
-		ret = request_irq(scmi_info->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;
-		}
-	} else {
-		cinfo->no_completion_irq = true;
-	}
-
-	scmi_info->func_id = func_id;
-	scmi_info->cinfo = cinfo;
-	smc_channel_lock_init(scmi_info);
-	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;
-
-	/* Ignore any possible further reception on the IRQ path */
-	if (scmi_info->irq > 0)
-		free_irq(scmi_info->irq, scmi_info);
-
-	cinfo->transport_info = NULL;
-	scmi_info->cinfo = NULL;
-
-	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;
-	unsigned long page = scmi_info->param_page;
-	unsigned long offset = scmi_info->param_offset;
-
-	/*
-	 * Channel will be released only once response has been
-	 * surely fully retrieved, so after .mark_txdone()
-	 */
-	smc_channel_lock_acquire(scmi_info, xfer);
-
-	shmem_tx_prepare(scmi_info->shmem, xfer, cinfo);
-
-	arm_smccc_1_1_invoke(scmi_info->func_id, page, offset, 0, 0, 0, 0, 0,
-			     &res);
-
-	/* Only SMCCC_RET_NOT_SUPPORTED is valid error code */
-	if (res.a0) {
-		smc_channel_lock_release(scmi_info);
-		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 void smc_mark_txdone(struct scmi_chan_info *cinfo, int ret,
-			    struct scmi_xfer *__unused)
-{
-	struct scmi_smc *scmi_info = cinfo->transport_info;
-
-	smc_channel_lock_release(scmi_info);
-}
-
-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,
-	.mark_txdone = smc_mark_txdone,
-	.fetch_response = smc_fetch_response,
-};
-
-const struct scmi_desc scmi_smc_desc = {
-	.ops = &scmi_smc_ops,
-	.max_rx_timeout_ms = 30,
-	.max_msg = 20,
-	.max_msg_size = 128,
-	/*
-	 * Setting .sync_cmds_atomic_replies to true for SMC assumes that,
-	 * once the SMC instruction has completed successfully, the issued
-	 * SCMI command would have been already fully processed by the SCMI
-	 * platform firmware and so any possible response value expected
-	 * for the issued command will be immmediately ready to be fetched
-	 * from the shared memory area.
-	 */
-	.sync_cmds_completed_on_ret = true,
-	.atomic_enabled = IS_ENABLED(CONFIG_ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE),
-};