^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * STi Mailbox
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2015 ST Microelectronics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: Lee Jones <lee.jones@linaro.org> for ST Microelectronics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Based on the original driver written by;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Alexandre Torgue, Olivier Lebreton and Loic Pallardy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mailbox_controller.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include "mailbox.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define STI_MBOX_INST_MAX 4 /* RAM saving: Max supported instances */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define STI_MBOX_CHAN_MAX 20 /* RAM saving: Max supported channels */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define STI_IRQ_VAL_OFFSET 0x04 /* Read interrupt status */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define STI_IRQ_SET_OFFSET 0x24 /* Generate a Tx channel interrupt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define STI_IRQ_CLR_OFFSET 0x44 /* Clear pending Rx interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define STI_ENA_VAL_OFFSET 0x64 /* Read enable status */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define STI_ENA_SET_OFFSET 0x84 /* Enable a channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define STI_ENA_CLR_OFFSET 0xa4 /* Disable a channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define MBOX_BASE(mdev, inst) ((mdev)->base + ((inst) * 4))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * STi Mailbox device data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * An IP Mailbox is currently composed of 4 instances
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * Each instance is currently composed of 32 channels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * This means that we have 128 channels per Mailbox
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * A channel an be used for TX or RX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * @dev: Device to which it is attached
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * @mbox: Representation of a communication channel controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * @base: Base address of the register mapping region
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * @name: Name of the mailbox
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * @enabled: Local copy of enabled channels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * @lock: Mutex protecting enabled status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct sti_mbox_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct mbox_controller *mbox;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) u32 enabled[STI_MBOX_INST_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * STi Mailbox platform specific configuration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * @num_inst: Maximum number of instances in one HW Mailbox
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * @num_chan: Maximum number of channel per instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct sti_mbox_pdata {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) unsigned int num_inst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) unsigned int num_chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * STi Mailbox allocated channel information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * @mdev: Pointer to parent Mailbox device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * @instance: Instance number channel resides in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * @channel: Channel number pertaining to this container
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct sti_channel {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) struct sti_mbox_device *mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) unsigned int instance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) unsigned int channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static inline bool sti_mbox_channel_is_enabled(struct mbox_chan *chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct sti_channel *chan_info = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct sti_mbox_device *mdev = chan_info->mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) unsigned int instance = chan_info->instance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) unsigned int channel = chan_info->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return mdev->enabled[instance] & BIT(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static inline
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct mbox_chan *sti_mbox_to_channel(struct mbox_controller *mbox,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) unsigned int instance,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) unsigned int channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct sti_channel *chan_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) for (i = 0; i < mbox->num_chans; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) chan_info = mbox->chans[i].con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (chan_info &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) chan_info->instance == instance &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) chan_info->channel == channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return &mbox->chans[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) dev_err(mbox->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) "Channel not registered: instance: %d channel: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) instance, channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static void sti_mbox_enable_channel(struct mbox_chan *chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct sti_channel *chan_info = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct sti_mbox_device *mdev = chan_info->mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) unsigned int instance = chan_info->instance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) unsigned int channel = chan_info->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) void __iomem *base = MBOX_BASE(mdev, instance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) spin_lock_irqsave(&mdev->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) mdev->enabled[instance] |= BIT(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) writel_relaxed(BIT(channel), base + STI_ENA_SET_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) spin_unlock_irqrestore(&mdev->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static void sti_mbox_disable_channel(struct mbox_chan *chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) struct sti_channel *chan_info = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) struct sti_mbox_device *mdev = chan_info->mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) unsigned int instance = chan_info->instance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) unsigned int channel = chan_info->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) void __iomem *base = MBOX_BASE(mdev, instance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) spin_lock_irqsave(&mdev->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) mdev->enabled[instance] &= ~BIT(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) writel_relaxed(BIT(channel), base + STI_ENA_CLR_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) spin_unlock_irqrestore(&mdev->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static void sti_mbox_clear_irq(struct mbox_chan *chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct sti_channel *chan_info = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) struct sti_mbox_device *mdev = chan_info->mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) unsigned int instance = chan_info->instance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) unsigned int channel = chan_info->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) void __iomem *base = MBOX_BASE(mdev, instance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) writel_relaxed(BIT(channel), base + STI_IRQ_CLR_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static struct mbox_chan *sti_mbox_irq_to_channel(struct sti_mbox_device *mdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) unsigned int instance)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) struct mbox_controller *mbox = mdev->mbox;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct mbox_chan *chan = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) unsigned int channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) unsigned long bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) void __iomem *base = MBOX_BASE(mdev, instance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) bits = readl_relaxed(base + STI_IRQ_VAL_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (!bits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) /* No IRQs fired in specified instance */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /* An IRQ has fired, find the associated channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) for (channel = 0; bits; channel++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (!test_and_clear_bit(channel, &bits))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) chan = sti_mbox_to_channel(mbox, instance, channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (chan) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) dev_dbg(mbox->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) "IRQ fired on instance: %d channel: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) instance, channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static irqreturn_t sti_mbox_thread_handler(int irq, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) struct sti_mbox_device *mdev = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct sti_mbox_pdata *pdata = dev_get_platdata(mdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct mbox_chan *chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) unsigned int instance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) for (instance = 0; instance < pdata->num_inst; instance++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) keep_looking:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) chan = sti_mbox_irq_to_channel(mdev, instance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (!chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) mbox_chan_received_data(chan, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) sti_mbox_clear_irq(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) sti_mbox_enable_channel(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) goto keep_looking;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static irqreturn_t sti_mbox_irq_handler(int irq, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) struct sti_mbox_device *mdev = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) struct sti_mbox_pdata *pdata = dev_get_platdata(mdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct sti_channel *chan_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct mbox_chan *chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) unsigned int instance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) int ret = IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) for (instance = 0; instance < pdata->num_inst; instance++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) chan = sti_mbox_irq_to_channel(mdev, instance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (!chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) chan_info = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (!sti_mbox_channel_is_enabled(chan)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) dev_warn(mdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) "Unexpected IRQ: %s\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) " instance: %d: channel: %d [enabled: %x]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) mdev->name, chan_info->instance,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) chan_info->channel, mdev->enabled[instance]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) /* Only handle IRQ if no other valid IRQs were found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (ret == IRQ_NONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) ret = IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) sti_mbox_disable_channel(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) ret = IRQ_WAKE_THREAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (ret == IRQ_NONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) dev_err(mdev->dev, "Spurious IRQ - was a channel requested?\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static bool sti_mbox_tx_is_ready(struct mbox_chan *chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct sti_channel *chan_info = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct sti_mbox_device *mdev = chan_info->mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) unsigned int instance = chan_info->instance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) unsigned int channel = chan_info->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) void __iomem *base = MBOX_BASE(mdev, instance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (!(readl_relaxed(base + STI_ENA_VAL_OFFSET) & BIT(channel))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) dev_dbg(mdev->dev, "Mbox: %s: inst: %d, chan: %d disabled\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) mdev->name, instance, channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (readl_relaxed(base + STI_IRQ_VAL_OFFSET) & BIT(channel)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) dev_dbg(mdev->dev, "Mbox: %s: inst: %d, chan: %d not ready\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) mdev->name, instance, channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) static int sti_mbox_send_data(struct mbox_chan *chan, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) struct sti_channel *chan_info = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) struct sti_mbox_device *mdev = chan_info->mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) unsigned int instance = chan_info->instance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) unsigned int channel = chan_info->channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) void __iomem *base = MBOX_BASE(mdev, instance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /* Send event to co-processor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) writel_relaxed(BIT(channel), base + STI_IRQ_SET_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) dev_dbg(mdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) "Sent via Mailbox %s: instance: %d channel: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) mdev->name, instance, channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static int sti_mbox_startup_chan(struct mbox_chan *chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) sti_mbox_clear_irq(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) sti_mbox_enable_channel(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static void sti_mbox_shutdown_chan(struct mbox_chan *chan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) struct sti_channel *chan_info = chan->con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) struct mbox_controller *mbox = chan_info->mdev->mbox;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) for (i = 0; i < mbox->num_chans; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) if (chan == &mbox->chans[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (mbox->num_chans == i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) dev_warn(mbox->dev, "Request to free non-existent channel\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) /* Reset channel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) sti_mbox_disable_channel(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) sti_mbox_clear_irq(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) chan->con_priv = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) static struct mbox_chan *sti_mbox_xlate(struct mbox_controller *mbox,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) const struct of_phandle_args *spec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct sti_mbox_device *mdev = dev_get_drvdata(mbox->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) struct sti_mbox_pdata *pdata = dev_get_platdata(mdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct sti_channel *chan_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) struct mbox_chan *chan = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) unsigned int instance = spec->args[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) unsigned int channel = spec->args[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) /* Bounds checking */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (instance >= pdata->num_inst || channel >= pdata->num_chan) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) dev_err(mbox->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) "Invalid channel requested instance: %d channel: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) instance, channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) for (i = 0; i < mbox->num_chans; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) chan_info = mbox->chans[i].con_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) /* Is requested channel free? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (chan_info &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) mbox->dev == chan_info->mdev->dev &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) instance == chan_info->instance &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) channel == chan_info->channel) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) dev_err(mbox->dev, "Channel in use\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) return ERR_PTR(-EBUSY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) * Find the first free slot, then continue checking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) * to see if requested channel is in use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) if (!chan && !chan_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) chan = &mbox->chans[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) if (!chan) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) dev_err(mbox->dev, "No free channels left\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) return ERR_PTR(-EBUSY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) chan_info = devm_kzalloc(mbox->dev, sizeof(*chan_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) if (!chan_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) chan_info->mdev = mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) chan_info->instance = instance;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) chan_info->channel = channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) chan->con_priv = chan_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) dev_info(mbox->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) "Mbox: %s: Created channel: instance: %d channel: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) mdev->name, instance, channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) return chan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) static const struct mbox_chan_ops sti_mbox_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) .startup = sti_mbox_startup_chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) .shutdown = sti_mbox_shutdown_chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) .send_data = sti_mbox_send_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) .last_tx_done = sti_mbox_tx_is_ready,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) static const struct sti_mbox_pdata mbox_stih407_pdata = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) .num_inst = 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) .num_chan = 32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) static const struct of_device_id sti_mailbox_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) .compatible = "st,stih407-mailbox",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) .data = (void *)&mbox_stih407_pdata
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) MODULE_DEVICE_TABLE(of, sti_mailbox_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) static int sti_mbox_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) const struct of_device_id *match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct mbox_controller *mbox;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) struct sti_mbox_device *mdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct device_node *np = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) struct mbox_chan *chans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) match = of_match_device(sti_mailbox_match, &pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (!match) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) dev_err(&pdev->dev, "No configuration found\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) pdev->dev.platform_data = (struct sti_mbox_pdata *) match->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) mdev = devm_kzalloc(&pdev->dev, sizeof(*mdev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (!mdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) platform_set_drvdata(pdev, mdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) mdev->base = devm_ioremap_resource(&pdev->dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (IS_ERR(mdev->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) return PTR_ERR(mdev->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) ret = of_property_read_string(np, "mbox-name", &mdev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) mdev->name = np->full_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) mbox = devm_kzalloc(&pdev->dev, sizeof(*mbox), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) if (!mbox)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) chans = devm_kcalloc(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) STI_MBOX_CHAN_MAX, sizeof(*chans), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (!chans)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) mdev->dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) mdev->mbox = mbox;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) spin_lock_init(&mdev->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) /* STi Mailbox does not have a Tx-Done or Tx-Ready IRQ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) mbox->txdone_irq = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) mbox->txdone_poll = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) mbox->txpoll_period = 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) mbox->ops = &sti_mbox_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) mbox->dev = mdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) mbox->of_xlate = sti_mbox_xlate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) mbox->chans = chans;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) mbox->num_chans = STI_MBOX_CHAN_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) ret = devm_mbox_controller_register(&pdev->dev, mbox);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) /* It's okay for Tx Mailboxes to not supply IRQs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) irq = platform_get_irq(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) if (irq < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) dev_info(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) "%s: Registered Tx only Mailbox\n", mdev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) ret = devm_request_threaded_irq(&pdev->dev, irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) sti_mbox_irq_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) sti_mbox_thread_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) IRQF_ONESHOT, mdev->name, mdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) dev_err(&pdev->dev, "Can't claim IRQ %d\n", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) dev_info(&pdev->dev, "%s: Registered Tx/Rx Mailbox\n", mdev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) static struct platform_driver sti_mbox_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) .probe = sti_mbox_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) .name = "sti-mailbox",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) .of_match_table = sti_mailbox_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) module_platform_driver(sti_mbox_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) MODULE_DESCRIPTION("STMicroelectronics Mailbox Controller");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) MODULE_ALIAS("platform:mailbox-sti");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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