misc: Constify amba_id table

pcc: cleanup and refactoring of shmem and irq handling
 qcom: add MSM8226 compatible
 fsl,mu: add i.MX94 compatible
 core: misc rejig of header includes
 	  minor const fixes
 mediatek: remove cl in struct cmdq_pkt
 tegra: define dimensioning masks in SoC data
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Merge tag 'mailbox-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/jassibrar/mailbox

Pull mailbox updates from Jassi Brar:
 "Core:
   - misc rejig of header includes
   - minor const fixes

  Misc:
   - constify amba_id table

  pcc:
   - cleanup and refactoring of shmem and irq handling

  qcom:
   - add MSM8226 compatible

  fsl,mu:
   - add i.MX94 compatible

  mediatek:
   - remove cl in struct cmdq_pkt

  tegra:
   - define dimensioning masks in SoC data"

* tag 'mailbox-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/jassibrar/mailbox: (25 commits)
  mailbox: Remove unneeded semicolon
  mailbox: pcc: Refactor and simplify check_and_ack()
  mailbox: pcc: Always map the shared memory communication address
  mailbox: pcc: Refactor error handling in irq handler into separate function
  mailbox: pcc: Use acpi_os_ioremap() instead of ioremap()
  mailbox: pcc: Return early if no GAS register from pcc_mbox_cmd_complete_check
  mailbox: pcc: Drop unnecessary endianness conversion of pcc_hdr.flags
  mailbox: pcc: Always clear the platform ack interrupt first
  mailbox: pcc: Fix the possible race in updation of chan_in_use flag
  dt-bindings: mailbox: qcom: add compatible for MSM8226 SoC
  dt-bindings: mailbox: fsl,mu: Add i.MX94 compatible
  MAINTAINERS: add mailbox API's tree type and location
  mailbox: remove unused header files
  mailbox: explicitly include <linux/bits.h>
  mailbox: sort headers alphabetically
  mailbox: don't protect of_parse_phandle_with_args with con_mutex
  mailbox: use error ret code of of_parse_phandle_with_args()
  mailbox: arm_mhuv2: Constify amba_id table
  mailbox: arm_mhu_db: Constify amba_id table
  mailbox: arm_mhu: Constify amba_id table
  ...

Documentation/devicetree/bindings/mailbox/fsl,mu.yaml

@@ -54,6 +54,10 @@ properties:
               - fsl,imx8qm-mu
               - fsl,imx8qxp-mu
           - const: fsl,imx6sx-mu
+      - items:
+          - enum:
+              - fsl,imx94-mu
+          - const: fsl,imx95-mu
 
   reg:
     maxItems: 1
@@ -142,7 +146,8 @@ allOf:
       not:
         properties:
           compatible:
-            const: fsl,imx95-mu
+            contains:
+              const: fsl,imx95-mu
     then:
       patternProperties:
         "^sram@[a-f0-9]+": false

Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml

@@ -25,6 +25,7 @@ properties:
           - mediatek,mt8188-gce
           - mediatek,mt8192-gce
           - mediatek,mt8195-gce
+          - mediatek,mt8196-gce
       - items:
           - const: mediatek,mt6795-gce
           - const: mediatek,mt8173-gce
@@ -49,6 +50,9 @@ properties:
     items:
       - const: gce
 
+  iommus:
+    maxItems: 1
+
 required:
   - compatible
   - "#mbox-cells"

Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.yaml

@@ -26,6 +26,7 @@ properties:
           - const: qcom,ipq6018-apcs-apps-global
       - items:
           - enum:
+              - qcom,msm8226-apcs-kpss-global
               - qcom,qcs404-apcs-apps-global
           - const: qcom,msm8916-apcs-kpss-global
           - const: syscon

MAINTAINERS

@@ -14090,6 +14090,7 @@ MAILBOX API
 M:	Jassi Brar <jassisinghbrar@gmail.com>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jassibrar/mailbox.git for-next
 F:	Documentation/devicetree/bindings/mailbox/
 F:	drivers/mailbox/
 F:	include/dt-bindings/mailbox/

drivers/mailbox/arm_mhu.c

@@ -153,7 +153,7 @@ static int mhu_probe(struct amba_device *adev, const struct amba_id *id)
 	return 0;
 }
 
-static struct amba_id mhu_ids[] = {
+static const struct amba_id mhu_ids[] = {
 	{
 		.id	= 0x1bb098,
 		.mask	= 0xffffff,

drivers/mailbox/arm_mhu_db.c

@@ -328,7 +328,7 @@ static int mhu_db_probe(struct amba_device *adev, const struct amba_id *id)
 	return 0;
 }
 
-static struct amba_id mhu_ids[] = {
+static const struct amba_id mhu_ids[] = {
 	{
 		.id	= 0x1bb098,
 		.mask	= 0xffffff,

drivers/mailbox/arm_mhuv2.c

@@ -1107,7 +1107,7 @@ static void mhuv2_remove(struct amba_device *adev)
 		writel_relaxed(0x0, &mhu->send->access_request);
 }
 
-static struct amba_id mhuv2_ids[] = {
+static const struct amba_id mhuv2_ids[] = {
 	{
 		/* 2.0 */
 		.id = 0xbb0d1,

drivers/mailbox/exynos-mailbox.c

@@ -57,7 +57,7 @@ static int exynos_mbox_send_data(struct mbox_chan *chan, void *data)
 	if (msg->chan_type != EXYNOS_MBOX_CHAN_TYPE_DOORBELL) {
 		dev_err(dev, "Unsupported channel type [%d]\n", msg->chan_type);
 		return -EINVAL;
-	};
+	}
 
 	writel(BIT(msg->chan_id), exynos_mbox->regs + EXYNOS_MBOX_INTGR1);
 

drivers/mailbox/mailbox.c

@@ -6,18 +6,15 @@
  * Author: Jassi Brar <jassisinghbrar@gmail.com>
  */
 
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/mutex.h>
 #include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/err.h>
-#include <linux/module.h>
 #include <linux/device.h>
-#include <linux/bitops.h>
+#include <linux/err.h>
 #include <linux/mailbox_client.h>
 #include <linux/mailbox_controller.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/of.h>
+#include <linux/spinlock.h>
 
 #include "mailbox.h"
 
@@ -413,15 +410,15 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index)
 		return ERR_PTR(-ENODEV);
 	}
 
-	mutex_lock(&con_mutex);
-
-	if (of_parse_phandle_with_args(dev->of_node, "mboxes",
-				       "#mbox-cells", index, &spec)) {
+	ret = of_parse_phandle_with_args(dev->of_node, "mboxes", "#mbox-cells",
+					 index, &spec);
+	if (ret) {
 		dev_dbg(dev, "%s: can't parse \"mboxes\" property\n", __func__);
-		mutex_unlock(&con_mutex);
-		return ERR_PTR(-ENODEV);
+		return ERR_PTR(ret);
 	}
 
+	mutex_lock(&con_mutex);
+
 	chan = ERR_PTR(-EPROBE_DEFER);
 	list_for_each_entry(mbox, &mbox_cons, node)
 		if (mbox->dev->of_node == spec.np) {

drivers/mailbox/mailbox.h

@@ -3,6 +3,8 @@
 #ifndef __MAILBOX_H
 #define __MAILBOX_H
 
+#include <linux/bits.h>
+
 #define TXDONE_BY_IRQ	BIT(0) /* controller has remote RTR irq */
 #define TXDONE_BY_POLL	BIT(1) /* controller can read status of last TX */
 #define TXDONE_BY_ACK	BIT(2) /* S/W ACK received by Client ticks the TX */

drivers/mailbox/pcc.c

@@ -117,8 +117,6 @@ struct pcc_chan_info {
 static struct pcc_chan_info *chan_info;
 static int pcc_chan_count;
 
-static int pcc_send_data(struct mbox_chan *chan, void *data);
-
 /*
  * PCC can be used with perf critical drivers such as CPPC
  * So it makes sense to locally cache the virtual address and
@@ -245,13 +243,13 @@ static bool pcc_mbox_cmd_complete_check(struct pcc_chan_info *pchan)
 	u64 val;
 	int ret;
 
+	if (!pchan->cmd_complete.gas)
+		return true;
+
 	ret = pcc_chan_reg_read(&pchan->cmd_complete, &val);
 	if (ret)
 		return false;
 
-	if (!pchan->cmd_complete.gas)
-		return true;
-
 	/*
 	 * Judge if the channel respond the interrupt based on the value of
 	 * command complete.
@@ -269,33 +267,43 @@ static bool pcc_mbox_cmd_complete_check(struct pcc_chan_info *pchan)
 	return !!val;
 }
 
-static void check_and_ack(struct pcc_chan_info *pchan, struct mbox_chan *chan)
+static int pcc_mbox_error_check_and_clear(struct pcc_chan_info *pchan)
 {
-	struct acpi_pcct_ext_pcc_shared_memory pcc_hdr;
+	u64 val;
+	int ret;
+
+	ret = pcc_chan_reg_read(&pchan->error, &val);
+	if (ret)
+		return ret;
+
+	val &= pchan->error.status_mask;
+	if (val) {
+		val &= ~pchan->error.status_mask;
+		pcc_chan_reg_write(&pchan->error, val);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void pcc_chan_acknowledge(struct pcc_chan_info *pchan)
+{
+	struct acpi_pcct_ext_pcc_shared_memory __iomem *pcc_hdr;
 
 	if (pchan->type != ACPI_PCCT_TYPE_EXT_PCC_SLAVE_SUBSPACE)
 		return;
-	/* If the memory region has not been mapped, we cannot
-	 * determine if we need to send the message, but we still
-	 * need to set the cmd_update flag before returning.
-	 */
-	if (pchan->chan.shmem == NULL) {
-		pcc_chan_reg_read_modify_write(&pchan->cmd_update);
-		return;
-	}
-	memcpy_fromio(&pcc_hdr, pchan->chan.shmem,
-		      sizeof(struct acpi_pcct_ext_pcc_shared_memory));
+
+	pcc_chan_reg_read_modify_write(&pchan->cmd_update);
+
+	pcc_hdr = pchan->chan.shmem;
+
 	/*
-	 * The PCC slave subspace channel needs to set the command complete bit
-	 * after processing message. If the PCC_ACK_FLAG is set, it should also
-	 * ring the doorbell.
-	 *
-	 * The PCC master subspace channel clears chan_in_use to free channel.
+	 * The PCC slave subspace channel needs to set the command
+	 * complete bit after processing message. If the PCC_ACK_FLAG
+	 * is set, it should also ring the doorbell.
 	 */
-	if (le32_to_cpup(&pcc_hdr.flags) & PCC_ACK_FLAG_MASK)
-		pcc_send_data(chan, NULL);
-	else
-		pcc_chan_reg_read_modify_write(&pchan->cmd_update);
+	if (ioread32(&pcc_hdr->flags) & PCC_CMD_COMPLETION_NOTIFY)
+		pcc_chan_reg_read_modify_write(&pchan->db);
 }
 
 /**
@@ -309,10 +317,12 @@ static irqreturn_t pcc_mbox_irq(int irq, void *p)
 {
 	struct pcc_chan_info *pchan;
 	struct mbox_chan *chan = p;
-	u64 val;
-	int ret;
 
 	pchan = chan->con_priv;
+
+	if (pcc_chan_reg_read_modify_write(&pchan->plat_irq_ack))
+		return IRQ_NONE;
+
 	if (pchan->type == ACPI_PCCT_TYPE_EXT_PCC_MASTER_SUBSPACE &&
 	    !pchan->chan_in_use)
 		return IRQ_NONE;
@@ -320,23 +330,19 @@ static irqreturn_t pcc_mbox_irq(int irq, void *p)
 	if (!pcc_mbox_cmd_complete_check(pchan))
 		return IRQ_NONE;
 
-	ret = pcc_chan_reg_read(&pchan->error, &val);
-	if (ret)
-		return IRQ_NONE;
-	val &= pchan->error.status_mask;
-	if (val) {
-		val &= ~pchan->error.status_mask;
-		pcc_chan_reg_write(&pchan->error, val);
-		return IRQ_NONE;
-	}
-
-	if (pcc_chan_reg_read_modify_write(&pchan->plat_irq_ack))
+	if (pcc_mbox_error_check_and_clear(pchan))
 		return IRQ_NONE;
 
+	/*
+	 * Clear this flag after updating interrupt ack register and just
+	 * before mbox_chan_received_data() which might call pcc_send_data()
+	 * where the flag is set again to start new transfer. This is
+	 * required to avoid any possible race in updatation of this flag.
+	 */
+	pchan->chan_in_use = false;
 	mbox_chan_received_data(chan, NULL);
 
-	check_and_ack(pchan, chan);
-	pchan->chan_in_use = false;
+	pcc_chan_acknowledge(pchan);
 
 	return IRQ_HANDLED;
 }
@@ -356,6 +362,7 @@ static irqreturn_t pcc_mbox_irq(int irq, void *p)
 struct pcc_mbox_chan *
 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
 {
+	struct pcc_mbox_chan *pcc_mchan;
 	struct pcc_chan_info *pchan;
 	struct mbox_chan *chan;
 	int rc;
@@ -374,7 +381,14 @@ pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
 	if (rc)
 		return ERR_PTR(rc);
 
-	return &pchan->chan;
+	pcc_mchan = &pchan->chan;
+	pcc_mchan->shmem = acpi_os_ioremap(pcc_mchan->shmem_base_addr,
+					   pcc_mchan->shmem_size);
+	if (pcc_mchan->shmem)
+		return pcc_mchan;
+
+	mbox_free_channel(chan);
+	return ERR_PTR(-ENXIO);
 }
 EXPORT_SYMBOL_GPL(pcc_mbox_request_channel);
 
@@ -403,21 +417,6 @@ void pcc_mbox_free_channel(struct pcc_mbox_chan *pchan)
 }
 EXPORT_SYMBOL_GPL(pcc_mbox_free_channel);
 
-int pcc_mbox_ioremap(struct mbox_chan *chan)
-{
-	struct pcc_chan_info *pchan_info;
-	struct pcc_mbox_chan *pcc_mbox_chan;
-
-	if (!chan || !chan->cl)
-		return -1;
-	pchan_info = chan->con_priv;
-	pcc_mbox_chan = &pchan_info->chan;
-	pcc_mbox_chan->shmem = ioremap(pcc_mbox_chan->shmem_base_addr,
-				       pcc_mbox_chan->shmem_size);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(pcc_mbox_ioremap);
-
 /**
  * pcc_send_data - Called from Mailbox Controller code. Used
  *		here only to ring the channel doorbell. The PCC client

drivers/mailbox/pl320-ipc.c

@@ -45,18 +45,6 @@ static DEFINE_MUTEX(ipc_m1_lock);
 static DECLARE_COMPLETION(ipc_completion);
 static ATOMIC_NOTIFIER_HEAD(ipc_notifier);
 
-static inline void set_destination(int source, int mbox)
-{
-	writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxDSET(mbox));
-	writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxMSET(mbox));
-}
-
-static inline void clear_destination(int source, int mbox)
-{
-	writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxDCLEAR(mbox));
-	writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxMCLEAR(mbox));
-}
-
 static void __ipc_send(int mbox, u32 *data)
 {
 	int i;
@@ -164,7 +152,7 @@ err:
 	return ret;
 }
 
-static struct amba_id pl320_ids[] = {
+static const struct amba_id pl320_ids[] = {
 	{
 		.id	= 0x00041320,
 		.mask	= 0x000fffff,

drivers/mailbox/tegra-hsp.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2016-2023, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2016-2025, NVIDIA CORPORATION.  All rights reserved.
  */
 
 #include <linux/delay.h>
@@ -28,12 +28,6 @@
 #define HSP_INT_FULL_MASK	0xff
 
 #define HSP_INT_DIMENSIONING	0x380
-#define HSP_nSM_SHIFT		0
-#define HSP_nSS_SHIFT		4
-#define HSP_nAS_SHIFT		8
-#define HSP_nDB_SHIFT		12
-#define HSP_nSI_SHIFT		16
-#define HSP_nINT_MASK		0xf
 
 #define HSP_DB_TRIGGER	0x0
 #define HSP_DB_ENABLE	0x4
@@ -97,6 +91,20 @@ struct tegra_hsp_soc {
 	bool has_per_mb_ie;
 	bool has_128_bit_mb;
 	unsigned int reg_stride;
+
+	/* Shifts for dimensioning register. */
+	unsigned int si_shift;
+	unsigned int db_shift;
+	unsigned int as_shift;
+	unsigned int ss_shift;
+	unsigned int sm_shift;
+
+	/* Masks for dimensioning register. */
+	unsigned int si_mask;
+	unsigned int db_mask;
+	unsigned int as_mask;
+	unsigned int ss_mask;
+	unsigned int sm_mask;
 };
 
 struct tegra_hsp {
@@ -747,11 +755,11 @@ static int tegra_hsp_probe(struct platform_device *pdev)
 		return PTR_ERR(hsp->regs);
 
 	value = tegra_hsp_readl(hsp, HSP_INT_DIMENSIONING);
-	hsp->num_sm = (value >> HSP_nSM_SHIFT) & HSP_nINT_MASK;
-	hsp->num_ss = (value >> HSP_nSS_SHIFT) & HSP_nINT_MASK;
-	hsp->num_as = (value >> HSP_nAS_SHIFT) & HSP_nINT_MASK;
-	hsp->num_db = (value >> HSP_nDB_SHIFT) & HSP_nINT_MASK;
-	hsp->num_si = (value >> HSP_nSI_SHIFT) & HSP_nINT_MASK;
+	hsp->num_sm = (value >> hsp->soc->sm_shift) & hsp->soc->sm_mask;
+	hsp->num_ss = (value >> hsp->soc->ss_shift) & hsp->soc->ss_mask;
+	hsp->num_as = (value >> hsp->soc->as_shift) & hsp->soc->as_mask;
+	hsp->num_db = (value >> hsp->soc->db_shift) & hsp->soc->db_mask;
+	hsp->num_si = (value >> hsp->soc->si_shift) & hsp->soc->si_mask;
 
 	err = platform_get_irq_byname_optional(pdev, "doorbell");
 	if (err >= 0)
@@ -915,6 +923,16 @@ static const struct tegra_hsp_soc tegra186_hsp_soc = {
 	.has_per_mb_ie = false,
 	.has_128_bit_mb = false,
 	.reg_stride = 0x100,
+	.si_shift = 16,
+	.db_shift = 12,
+	.as_shift = 8,
+	.ss_shift = 4,
+	.sm_shift = 0,
+	.si_mask = 0xf,
+	.db_mask = 0xf,
+	.as_mask = 0xf,
+	.ss_mask = 0xf,
+	.sm_mask = 0xf,
 };
 
 static const struct tegra_hsp_soc tegra194_hsp_soc = {
@@ -922,6 +940,16 @@ static const struct tegra_hsp_soc tegra194_hsp_soc = {
 	.has_per_mb_ie = true,
 	.has_128_bit_mb = false,
 	.reg_stride = 0x100,
+	.si_shift = 16,
+	.db_shift = 12,
+	.as_shift = 8,
+	.ss_shift = 4,
+	.sm_shift = 0,
+	.si_mask = 0xf,
+	.db_mask = 0xf,
+	.as_mask = 0xf,
+	.ss_mask = 0xf,
+	.sm_mask = 0xf,
 };
 
 static const struct tegra_hsp_soc tegra234_hsp_soc = {
@@ -929,6 +957,16 @@ static const struct tegra_hsp_soc tegra234_hsp_soc = {
 	.has_per_mb_ie = false,
 	.has_128_bit_mb = true,
 	.reg_stride = 0x100,
+	.si_shift = 16,
+	.db_shift = 12,
+	.as_shift = 8,
+	.ss_shift = 4,
+	.sm_shift = 0,
+	.si_mask = 0xf,
+	.db_mask = 0xf,
+	.as_mask = 0xf,
+	.ss_mask = 0xf,
+	.sm_mask = 0xf,
 };
 
 static const struct tegra_hsp_soc tegra264_hsp_soc = {
@@ -936,6 +974,16 @@ static const struct tegra_hsp_soc tegra264_hsp_soc = {
 	.has_per_mb_ie = false,
 	.has_128_bit_mb = true,
 	.reg_stride = 0x1000,
+	.si_shift = 17,
+	.db_shift = 12,
+	.as_shift = 8,
+	.ss_shift = 4,
+	.sm_shift = 0,
+	.si_mask = 0x1f,
+	.db_mask = 0x1f,
+	.as_mask = 0xf,
+	.ss_mask = 0xf,
+	.sm_mask = 0xf,
 };
 
 static const struct of_device_id tegra_hsp_match[] = {

include/acpi/pcc.h

@@ -32,13 +32,11 @@ struct pcc_mbox_chan {
 #define PCC_CMD_COMPLETION_NOTIFY	BIT(0)
 
 #define MAX_PCC_SUBSPACES	256
-#define PCC_ACK_FLAG_MASK	0x1
 
 #ifdef CONFIG_PCC
 extern struct pcc_mbox_chan *
 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);
 extern void pcc_mbox_free_channel(struct pcc_mbox_chan *chan);
-extern int pcc_mbox_ioremap(struct mbox_chan *chan);
 #else
 static inline struct pcc_mbox_chan *
 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
@@ -46,10 +44,6 @@ pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
 	return ERR_PTR(-ENODEV);
 }
 static inline void pcc_mbox_free_channel(struct pcc_mbox_chan *chan) { }
-static inline int pcc_mbox_ioremap(struct mbox_chan *chan)
-{
-	return 0;
-};
 #endif
 
 #endif /* _PCC_H */

include/linux/mailbox/mtk-cmdq-mailbox.h

@@ -75,7 +75,6 @@ struct cmdq_pkt {
 	dma_addr_t		pa_base;
 	size_t			cmd_buf_size; /* command occupied size */
 	size_t			buf_size; /* real buffer size */
-	void			*cl;
 };
 
 u8 cmdq_get_shift_pa(struct mbox_chan *chan);

include/linux/mailbox_client.h

@@ -7,8 +7,8 @@
 #ifndef __MAILBOX_CLIENT_H
 #define __MAILBOX_CLIENT_H
 
-#include <linux/of.h>
 #include <linux/device.h>
+#include <linux/of.h>
 
 struct mbox_chan;
 

include/linux/mailbox_controller.h

@@ -3,11 +3,11 @@
 #ifndef __MAILBOX_CONTROLLER_H
 #define __MAILBOX_CONTROLLER_H
 
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/hrtimer.h>
 #include <linux/of.h>
 #include <linux/types.h>
-#include <linux/hrtimer.h>
-#include <linux/device.h>
-#include <linux/completion.h>
 
 struct mbox_chan;