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![Dan Carpenter](/assets/img/avatar_default.png)
We have to use the _safe version of list_for_each() because we're
freeing the pointer as we go along. (This might not show up testing
depending on what config options you have enabled).
Fixes: 0fe88461a0
("mailbox: Add Tegra HSP driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
479 lines
11 KiB
C
479 lines
11 KiB
C
/*
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/mailbox_controller.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <dt-bindings/mailbox/tegra186-hsp.h>
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#define HSP_INT_DIMENSIONING 0x380
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#define HSP_nSM_SHIFT 0
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#define HSP_nSS_SHIFT 4
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#define HSP_nAS_SHIFT 8
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#define HSP_nDB_SHIFT 12
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#define HSP_nSI_SHIFT 16
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#define HSP_nINT_MASK 0xf
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#define HSP_DB_TRIGGER 0x0
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#define HSP_DB_ENABLE 0x4
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#define HSP_DB_RAW 0x8
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#define HSP_DB_PENDING 0xc
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#define HSP_DB_CCPLEX 1
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#define HSP_DB_BPMP 3
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#define HSP_DB_MAX 7
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struct tegra_hsp_channel;
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struct tegra_hsp;
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struct tegra_hsp_channel {
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struct tegra_hsp *hsp;
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struct mbox_chan *chan;
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void __iomem *regs;
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};
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struct tegra_hsp_doorbell {
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struct tegra_hsp_channel channel;
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struct list_head list;
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const char *name;
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unsigned int master;
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unsigned int index;
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};
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struct tegra_hsp_db_map {
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const char *name;
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unsigned int master;
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unsigned int index;
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};
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struct tegra_hsp_soc {
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const struct tegra_hsp_db_map *map;
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};
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struct tegra_hsp {
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const struct tegra_hsp_soc *soc;
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struct mbox_controller mbox;
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void __iomem *regs;
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unsigned int irq;
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unsigned int num_sm;
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unsigned int num_as;
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unsigned int num_ss;
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unsigned int num_db;
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unsigned int num_si;
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spinlock_t lock;
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struct list_head doorbells;
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};
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static inline struct tegra_hsp *
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to_tegra_hsp(struct mbox_controller *mbox)
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{
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return container_of(mbox, struct tegra_hsp, mbox);
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}
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static inline u32 tegra_hsp_readl(struct tegra_hsp *hsp, unsigned int offset)
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{
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return readl(hsp->regs + offset);
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}
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static inline void tegra_hsp_writel(struct tegra_hsp *hsp, u32 value,
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unsigned int offset)
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{
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writel(value, hsp->regs + offset);
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}
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static inline u32 tegra_hsp_channel_readl(struct tegra_hsp_channel *channel,
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unsigned int offset)
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{
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return readl(channel->regs + offset);
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}
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static inline void tegra_hsp_channel_writel(struct tegra_hsp_channel *channel,
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u32 value, unsigned int offset)
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{
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writel(value, channel->regs + offset);
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}
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static bool tegra_hsp_doorbell_can_ring(struct tegra_hsp_doorbell *db)
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{
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u32 value;
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value = tegra_hsp_channel_readl(&db->channel, HSP_DB_ENABLE);
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return (value & BIT(TEGRA_HSP_DB_MASTER_CCPLEX)) != 0;
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}
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static struct tegra_hsp_doorbell *
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__tegra_hsp_doorbell_get(struct tegra_hsp *hsp, unsigned int master)
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{
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struct tegra_hsp_doorbell *entry;
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list_for_each_entry(entry, &hsp->doorbells, list)
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if (entry->master == master)
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return entry;
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return NULL;
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}
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static struct tegra_hsp_doorbell *
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tegra_hsp_doorbell_get(struct tegra_hsp *hsp, unsigned int master)
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{
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struct tegra_hsp_doorbell *db;
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unsigned long flags;
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spin_lock_irqsave(&hsp->lock, flags);
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db = __tegra_hsp_doorbell_get(hsp, master);
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spin_unlock_irqrestore(&hsp->lock, flags);
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return db;
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}
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static irqreturn_t tegra_hsp_doorbell_irq(int irq, void *data)
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{
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struct tegra_hsp *hsp = data;
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struct tegra_hsp_doorbell *db;
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unsigned long master, value;
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db = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
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if (!db)
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return IRQ_NONE;
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value = tegra_hsp_channel_readl(&db->channel, HSP_DB_PENDING);
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tegra_hsp_channel_writel(&db->channel, value, HSP_DB_PENDING);
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spin_lock(&hsp->lock);
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for_each_set_bit(master, &value, hsp->mbox.num_chans) {
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struct tegra_hsp_doorbell *db;
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db = __tegra_hsp_doorbell_get(hsp, master);
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/*
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* Depending on the bootloader chain, the CCPLEX doorbell will
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* have some doorbells enabled, which means that requesting an
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* interrupt will immediately fire.
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*
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* In that case, db->channel.chan will still be NULL here and
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* cause a crash if not properly guarded.
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*
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* It remains to be seen if ignoring the doorbell in that case
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* is the correct solution.
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*/
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if (db && db->channel.chan)
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mbox_chan_received_data(db->channel.chan, NULL);
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}
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spin_unlock(&hsp->lock);
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return IRQ_HANDLED;
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}
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static struct tegra_hsp_channel *
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tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name,
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unsigned int master, unsigned int index)
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{
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struct tegra_hsp_doorbell *db;
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unsigned int offset;
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unsigned long flags;
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db = kzalloc(sizeof(*db), GFP_KERNEL);
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if (!db)
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return ERR_PTR(-ENOMEM);
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offset = (1 + (hsp->num_sm / 2) + hsp->num_ss + hsp->num_as) << 16;
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offset += index * 0x100;
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db->channel.regs = hsp->regs + offset;
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db->channel.hsp = hsp;
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db->name = kstrdup_const(name, GFP_KERNEL);
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db->master = master;
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db->index = index;
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spin_lock_irqsave(&hsp->lock, flags);
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list_add_tail(&db->list, &hsp->doorbells);
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spin_unlock_irqrestore(&hsp->lock, flags);
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return &db->channel;
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}
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static void __tegra_hsp_doorbell_destroy(struct tegra_hsp_doorbell *db)
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{
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list_del(&db->list);
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kfree_const(db->name);
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kfree(db);
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}
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static int tegra_hsp_doorbell_send_data(struct mbox_chan *chan, void *data)
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{
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struct tegra_hsp_doorbell *db = chan->con_priv;
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tegra_hsp_channel_writel(&db->channel, 1, HSP_DB_TRIGGER);
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return 0;
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}
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static int tegra_hsp_doorbell_startup(struct mbox_chan *chan)
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{
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struct tegra_hsp_doorbell *db = chan->con_priv;
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struct tegra_hsp *hsp = db->channel.hsp;
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struct tegra_hsp_doorbell *ccplex;
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unsigned long flags;
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u32 value;
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if (db->master >= hsp->mbox.num_chans) {
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dev_err(hsp->mbox.dev,
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"invalid master ID %u for HSP channel\n",
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db->master);
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return -EINVAL;
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}
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ccplex = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
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if (!ccplex)
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return -ENODEV;
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if (!tegra_hsp_doorbell_can_ring(db))
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return -ENODEV;
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spin_lock_irqsave(&hsp->lock, flags);
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value = tegra_hsp_channel_readl(&ccplex->channel, HSP_DB_ENABLE);
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value |= BIT(db->master);
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tegra_hsp_channel_writel(&ccplex->channel, value, HSP_DB_ENABLE);
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spin_unlock_irqrestore(&hsp->lock, flags);
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return 0;
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}
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static void tegra_hsp_doorbell_shutdown(struct mbox_chan *chan)
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{
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struct tegra_hsp_doorbell *db = chan->con_priv;
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struct tegra_hsp *hsp = db->channel.hsp;
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struct tegra_hsp_doorbell *ccplex;
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unsigned long flags;
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u32 value;
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ccplex = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
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if (!ccplex)
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return;
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spin_lock_irqsave(&hsp->lock, flags);
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value = tegra_hsp_channel_readl(&ccplex->channel, HSP_DB_ENABLE);
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value &= ~BIT(db->master);
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tegra_hsp_channel_writel(&ccplex->channel, value, HSP_DB_ENABLE);
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spin_unlock_irqrestore(&hsp->lock, flags);
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}
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static const struct mbox_chan_ops tegra_hsp_doorbell_ops = {
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.send_data = tegra_hsp_doorbell_send_data,
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.startup = tegra_hsp_doorbell_startup,
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.shutdown = tegra_hsp_doorbell_shutdown,
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};
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static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox,
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const struct of_phandle_args *args)
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{
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struct tegra_hsp_channel *channel = ERR_PTR(-ENODEV);
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struct tegra_hsp *hsp = to_tegra_hsp(mbox);
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unsigned int type = args->args[0];
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unsigned int master = args->args[1];
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struct tegra_hsp_doorbell *db;
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struct mbox_chan *chan;
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unsigned long flags;
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unsigned int i;
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switch (type) {
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case TEGRA_HSP_MBOX_TYPE_DB:
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db = tegra_hsp_doorbell_get(hsp, master);
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if (db)
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channel = &db->channel;
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break;
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default:
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break;
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}
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if (IS_ERR(channel))
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return ERR_CAST(channel);
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spin_lock_irqsave(&hsp->lock, flags);
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for (i = 0; i < hsp->mbox.num_chans; i++) {
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chan = &hsp->mbox.chans[i];
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if (!chan->con_priv) {
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chan->con_priv = channel;
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channel->chan = chan;
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break;
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}
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chan = NULL;
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}
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spin_unlock_irqrestore(&hsp->lock, flags);
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return chan ?: ERR_PTR(-EBUSY);
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}
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static void tegra_hsp_remove_doorbells(struct tegra_hsp *hsp)
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{
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struct tegra_hsp_doorbell *db, *tmp;
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unsigned long flags;
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spin_lock_irqsave(&hsp->lock, flags);
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list_for_each_entry_safe(db, tmp, &hsp->doorbells, list)
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__tegra_hsp_doorbell_destroy(db);
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spin_unlock_irqrestore(&hsp->lock, flags);
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}
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static int tegra_hsp_add_doorbells(struct tegra_hsp *hsp)
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{
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const struct tegra_hsp_db_map *map = hsp->soc->map;
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struct tegra_hsp_channel *channel;
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while (map->name) {
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channel = tegra_hsp_doorbell_create(hsp, map->name,
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map->master, map->index);
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if (IS_ERR(channel)) {
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tegra_hsp_remove_doorbells(hsp);
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return PTR_ERR(channel);
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}
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map++;
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}
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return 0;
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}
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static int tegra_hsp_probe(struct platform_device *pdev)
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{
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struct tegra_hsp *hsp;
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struct resource *res;
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u32 value;
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int err;
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hsp = devm_kzalloc(&pdev->dev, sizeof(*hsp), GFP_KERNEL);
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if (!hsp)
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return -ENOMEM;
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hsp->soc = of_device_get_match_data(&pdev->dev);
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INIT_LIST_HEAD(&hsp->doorbells);
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spin_lock_init(&hsp->lock);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hsp->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(hsp->regs))
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return PTR_ERR(hsp->regs);
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value = tegra_hsp_readl(hsp, HSP_INT_DIMENSIONING);
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hsp->num_sm = (value >> HSP_nSM_SHIFT) & HSP_nINT_MASK;
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hsp->num_ss = (value >> HSP_nSS_SHIFT) & HSP_nINT_MASK;
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hsp->num_as = (value >> HSP_nAS_SHIFT) & HSP_nINT_MASK;
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hsp->num_db = (value >> HSP_nDB_SHIFT) & HSP_nINT_MASK;
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hsp->num_si = (value >> HSP_nSI_SHIFT) & HSP_nINT_MASK;
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err = platform_get_irq_byname(pdev, "doorbell");
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if (err < 0) {
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dev_err(&pdev->dev, "failed to get doorbell IRQ: %d\n", err);
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return err;
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}
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hsp->irq = err;
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hsp->mbox.of_xlate = of_tegra_hsp_xlate;
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hsp->mbox.num_chans = 32;
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hsp->mbox.dev = &pdev->dev;
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hsp->mbox.txdone_irq = false;
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hsp->mbox.txdone_poll = false;
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hsp->mbox.ops = &tegra_hsp_doorbell_ops;
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hsp->mbox.chans = devm_kcalloc(&pdev->dev, hsp->mbox.num_chans,
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sizeof(*hsp->mbox.chans),
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GFP_KERNEL);
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if (!hsp->mbox.chans)
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return -ENOMEM;
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err = tegra_hsp_add_doorbells(hsp);
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if (err < 0) {
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dev_err(&pdev->dev, "failed to add doorbells: %d\n", err);
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return err;
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}
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platform_set_drvdata(pdev, hsp);
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err = mbox_controller_register(&hsp->mbox);
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if (err) {
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dev_err(&pdev->dev, "failed to register mailbox: %d\n", err);
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tegra_hsp_remove_doorbells(hsp);
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return err;
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}
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err = devm_request_irq(&pdev->dev, hsp->irq, tegra_hsp_doorbell_irq,
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IRQF_NO_SUSPEND, dev_name(&pdev->dev), hsp);
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if (err < 0) {
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dev_err(&pdev->dev, "failed to request IRQ#%u: %d\n",
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hsp->irq, err);
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return err;
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}
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return 0;
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}
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static int tegra_hsp_remove(struct platform_device *pdev)
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{
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struct tegra_hsp *hsp = platform_get_drvdata(pdev);
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mbox_controller_unregister(&hsp->mbox);
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tegra_hsp_remove_doorbells(hsp);
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return 0;
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}
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static const struct tegra_hsp_db_map tegra186_hsp_db_map[] = {
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{ "ccplex", TEGRA_HSP_DB_MASTER_CCPLEX, HSP_DB_CCPLEX, },
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{ "bpmp", TEGRA_HSP_DB_MASTER_BPMP, HSP_DB_BPMP, },
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{ /* sentinel */ }
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};
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static const struct tegra_hsp_soc tegra186_hsp_soc = {
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.map = tegra186_hsp_db_map,
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};
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static const struct of_device_id tegra_hsp_match[] = {
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{ .compatible = "nvidia,tegra186-hsp", .data = &tegra186_hsp_soc },
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{ }
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};
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static struct platform_driver tegra_hsp_driver = {
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.driver = {
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.name = "tegra-hsp",
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.of_match_table = tegra_hsp_match,
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},
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.probe = tegra_hsp_probe,
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.remove = tegra_hsp_remove,
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};
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static int __init tegra_hsp_init(void)
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{
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return platform_driver_register(&tegra_hsp_driver);
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}
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core_initcall(tegra_hsp_init);
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