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/*
* Mailbox reservation modules for OMAP2/3
*
* Copyright (C) 2006-2009 Nokia Corporation
* Written by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
* and Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <plat/mailbox.h>
#include "soc.h"
#define MAILBOX_REVISION 0x000
#define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
#define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
#define MAILBOX_MSGSTATUS(m) (0x0c0 + 4 * (m))
#define MAILBOX_IRQSTATUS(u) (0x100 + 8 * (u))
#define MAILBOX_IRQENABLE(u) (0x104 + 8 * (u))
#define OMAP4_MAILBOX_IRQSTATUS(u) (0x104 + 0x10 * (u))
#define OMAP4_MAILBOX_IRQENABLE(u) (0x108 + 0x10 * (u))
#define OMAP4_MAILBOX_IRQENABLE_CLR(u) (0x10c + 0x10 * (u))
#define MAILBOX_IRQ_NEWMSG(m) (1 << (2 * (m)))
#define MAILBOX_IRQ_NOTFULL(m) (1 << (2 * (m) + 1))
#define MBOX_REG_SIZE 0x120
#define OMAP4_MBOX_REG_SIZE 0x130
#define MBOX_NR_REGS (MBOX_REG_SIZE / sizeof(u32))
#define OMAP4_MBOX_NR_REGS (OMAP4_MBOX_REG_SIZE / sizeof(u32))
static void __iomem *mbox_base;
struct omap_mbox2_fifo {
unsigned long msg;
unsigned long fifo_stat;
unsigned long msg_stat;
};
struct omap_mbox2_priv {
struct omap_mbox2_fifo tx_fifo;
struct omap_mbox2_fifo rx_fifo;
unsigned long irqenable;
unsigned long irqstatus;
u32 newmsg_bit;
u32 notfull_bit;
u32 ctx[OMAP4_MBOX_NR_REGS];
unsigned long irqdisable;
};
static void omap2_mbox_enable_irq(struct omap_mbox *mbox,
omap_mbox_type_t irq);
static inline unsigned int mbox_read_reg(size_t ofs)
{
return __raw_readl(mbox_base + ofs);
}
static inline void mbox_write_reg(u32 val, size_t ofs)
{
__raw_writel(val, mbox_base + ofs);
}
/* Mailbox H/W preparations */
static int omap2_mbox_startup(struct omap_mbox *mbox)
{
u32 l;
pm_runtime_enable(mbox->dev->parent);
pm_runtime_get_sync(mbox->dev->parent);
l = mbox_read_reg(MAILBOX_REVISION);
pr_debug("omap mailbox rev %d.%d\n", (l & 0xf0) >> 4, (l & 0x0f));
return 0;
}
static void omap2_mbox_shutdown(struct omap_mbox *mbox)
{
pm_runtime_put_sync(mbox->dev->parent);
pm_runtime_disable(mbox->dev->parent);
}
/* Mailbox FIFO handle functions */
static mbox_msg_t omap2_mbox_fifo_read(struct omap_mbox *mbox)
{
struct omap_mbox2_fifo *fifo =
&((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
return (mbox_msg_t) mbox_read_reg(fifo->msg);
}
static void omap2_mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
{
struct omap_mbox2_fifo *fifo =
&((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
mbox_write_reg(msg, fifo->msg);
}
static int omap2_mbox_fifo_empty(struct omap_mbox *mbox)
{
struct omap_mbox2_fifo *fifo =
&((struct omap_mbox2_priv *)mbox->priv)->rx_fifo;
return (mbox_read_reg(fifo->msg_stat) == 0);
}
static int omap2_mbox_fifo_full(struct omap_mbox *mbox)
{
struct omap_mbox2_fifo *fifo =
&((struct omap_mbox2_priv *)mbox->priv)->tx_fifo;
return mbox_read_reg(fifo->fifo_stat);
}
/* Mailbox IRQ handle functions */
static void omap2_mbox_enable_irq(struct omap_mbox *mbox,
omap_mbox_type_t irq)
{
struct omap_mbox2_priv *p = mbox->priv;
u32 l, bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
l = mbox_read_reg(p->irqenable);
l |= bit;
mbox_write_reg(l, p->irqenable);
}
static void omap2_mbox_disable_irq(struct omap_mbox *mbox,
omap_mbox_type_t irq)
{
struct omap_mbox2_priv *p = mbox->priv;
u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
if (!cpu_is_omap44xx())
bit = mbox_read_reg(p->irqdisable) & ~bit;
mbox_write_reg(bit, p->irqdisable);
}
static void omap2_mbox_ack_irq(struct omap_mbox *mbox,
omap_mbox_type_t irq)
{
struct omap_mbox2_priv *p = mbox->priv;
u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
mbox_write_reg(bit, p->irqstatus);
/* Flush posted write for irq status to avoid spurious interrupts */
mbox_read_reg(p->irqstatus);
}
static int omap2_mbox_is_irq(struct omap_mbox *mbox,
omap_mbox_type_t irq)
{
struct omap_mbox2_priv *p = mbox->priv;
u32 bit = (irq == IRQ_TX) ? p->notfull_bit : p->newmsg_bit;
u32 enable = mbox_read_reg(p->irqenable);
u32 status = mbox_read_reg(p->irqstatus);
return (int)(enable & status & bit);
}
static void omap2_mbox_save_ctx(struct omap_mbox *mbox)
{
int i;
struct omap_mbox2_priv *p = mbox->priv;
int nr_regs;
if (cpu_is_omap44xx())
nr_regs = OMAP4_MBOX_NR_REGS;
else
nr_regs = MBOX_NR_REGS;
for (i = 0; i < nr_regs; i++) {
p->ctx[i] = mbox_read_reg(i * sizeof(u32));
dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
i, p->ctx[i]);
}
}
static void omap2_mbox_restore_ctx(struct omap_mbox *mbox)
{
int i;
struct omap_mbox2_priv *p = mbox->priv;
int nr_regs;
if (cpu_is_omap44xx())
nr_regs = OMAP4_MBOX_NR_REGS;
else
nr_regs = MBOX_NR_REGS;
for (i = 0; i < nr_regs; i++) {
mbox_write_reg(p->ctx[i], i * sizeof(u32));
dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
i, p->ctx[i]);
}
}
static struct omap_mbox_ops omap2_mbox_ops = {
.type = OMAP_MBOX_TYPE2,
.startup = omap2_mbox_startup,
.shutdown = omap2_mbox_shutdown,
.fifo_read = omap2_mbox_fifo_read,
.fifo_write = omap2_mbox_fifo_write,
.fifo_empty = omap2_mbox_fifo_empty,
.fifo_full = omap2_mbox_fifo_full,
.enable_irq = omap2_mbox_enable_irq,
.disable_irq = omap2_mbox_disable_irq,
.ack_irq = omap2_mbox_ack_irq,
.is_irq = omap2_mbox_is_irq,
.save_ctx = omap2_mbox_save_ctx,
.restore_ctx = omap2_mbox_restore_ctx,
};
/*
* MAILBOX 0: ARM -> DSP,
* MAILBOX 1: ARM <- DSP.
* MAILBOX 2: ARM -> IVA,
* MAILBOX 3: ARM <- IVA.
*/
/* FIXME: the following structs should be filled automatically by the user id */
#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP2)
/* DSP */
static struct omap_mbox2_priv omap2_mbox_dsp_priv = {
.tx_fifo = {
.msg = MAILBOX_MESSAGE(0),
.fifo_stat = MAILBOX_FIFOSTATUS(0),
},
.rx_fifo = {
.msg = MAILBOX_MESSAGE(1),
.msg_stat = MAILBOX_MSGSTATUS(1),
},
.irqenable = MAILBOX_IRQENABLE(0),
.irqstatus = MAILBOX_IRQSTATUS(0),
.notfull_bit = MAILBOX_IRQ_NOTFULL(0),
.newmsg_bit = MAILBOX_IRQ_NEWMSG(1),
.irqdisable = MAILBOX_IRQENABLE(0),
};
struct omap_mbox mbox_dsp_info = {
.name = "dsp",
.ops = &omap2_mbox_ops,
.priv = &omap2_mbox_dsp_priv,
};
#endif
#if defined(CONFIG_ARCH_OMAP3)
struct omap_mbox *omap3_mboxes[] = { &mbox_dsp_info, NULL };
#endif
#if defined(CONFIG_SOC_OMAP2420)
/* IVA */
static struct omap_mbox2_priv omap2_mbox_iva_priv = {
.tx_fifo = {
.msg = MAILBOX_MESSAGE(2),
.fifo_stat = MAILBOX_FIFOSTATUS(2),
},
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