path: root/arch/powerpc/sysdev/fsl_rio.c

/*
 * Freescale MPC85xx/MPC86xx RapidIO support
 *
 * Copyright (C) 2007, 2008 Freescale Semiconductor, Inc.
 * Zhang Wei <wei.zhang@freescale.com>
 *
 * Copyright 2005 MontaVista Software, Inc.
 * Matt Porter <mporter@kernel.crashing.org>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/of_platform.h>

#include <asm/io.h>

/* RapidIO definition irq, which read from OF-tree */
#define IRQ_RIO_BELL(m)		(((struct rio_priv *)(m->priv))->bellirq)
#define IRQ_RIO_TX(m)		(((struct rio_priv *)(m->priv))->txirq)
#define IRQ_RIO_RX(m)		(((struct rio_priv *)(m->priv))->rxirq)

#define RIO_ATMU_REGS_OFFSET	0x10c00
#define RIO_MSG_REGS_OFFSET	0x11000
#define RIO_MAINT_WIN_SIZE	0x400000
#define RIO_DBELL_WIN_SIZE	0x1000

#define RIO_MSG_OMR_MUI		0x00000002
#define RIO_MSG_OSR_TE		0x00000080
#define RIO_MSG_OSR_QOI		0x00000020
#define RIO_MSG_OSR_QFI		0x00000010
#define RIO_MSG_OSR_MUB		0x00000004
#define RIO_MSG_OSR_EOMI	0x00000002
#define RIO_MSG_OSR_QEI		0x00000001

#define RIO_MSG_IMR_MI		0x00000002
#define RIO_MSG_ISR_TE		0x00000080
#define RIO_MSG_ISR_QFI		0x00000010
#define RIO_MSG_ISR_DIQI	0x00000001

#define RIO_MSG_DESC_SIZE	32
#define RIO_MSG_BUFFER_SIZE	4096
#define RIO_MIN_TX_RING_SIZE	2
#define RIO_MAX_TX_RING_SIZE	2048
#define RIO_MIN_RX_RING_SIZE	2
#define RIO_MAX_RX_RING_SIZE	2048

#define DOORBELL_DMR_DI		0x00000002
#define DOORBELL_DSR_TE		0x00000080
#define DOORBELL_DSR_QFI	0x00000010
#define DOORBELL_DSR_DIQI	0x00000001
#define DOORBELL_TID_OFFSET	0x03
#define DOORBELL_SID_OFFSET	0x05
#define DOORBELL_INFO_OFFSET	0x06

#define DOORBELL_MESSAGE_SIZE	0x08
#define DBELL_SID(x)		(*(u8 *)(x + DOORBELL_SID_OFFSET))
#define DBELL_TID(x)		(*(u8 *)(x + DOORBELL_TID_OFFSET))
#define DBELL_INF(x)		(*(u16 *)(x + DOORBELL_INFO_OFFSET))

struct rio_atmu_regs {
	u32 rowtar;
	u32 pad1;
	u32 rowbar;
	u32 pad2;
	u32 rowar;
	u32 pad3[3];
};

struct rio_msg_regs {
	u32 omr;
	u32 osr;
	u32 pad1;
	u32 odqdpar;
	u32 pad2;
	u32 osar;
	u32 odpr;
	u32 odatr;
	u32 odcr;
	u32 pad3;
	u32 odqepar;
	u32 pad4[13];
	u32 imr;
	u32 isr;
	u32 pad5;
	u32 ifqdpar;
	u32 pad6;
	u32 ifqepar;
	u32 pad7[250];
	u32 dmr;
	u32 dsr;
	u32 pad8;
	u32 dqdpar;
	u32 pad9;
	u32 dqepar;
	u32 pad10[26];
	u32 pwmr;
	u32 pwsr;
	u32 pad11;
	u32 pwqbar;
};

struct rio_tx_desc {
	u32 res1;
	u32 saddr;
	u32 dport;
	u32 dattr;
	u32 res2;
	u32 res3;
	u32 dwcnt;
	u32 res4;
};

struct rio_dbell_ring {
	void *virt;
	dma_addr_t phys;
};

struct rio_msg_tx_ring {
	void *virt;
	dma_addr_t phys;
	void *virt_buffer[RIO_MAX_TX_RING_SIZE];
	dma_addr_t phys_buffer[RIO_MAX_TX_RING_SIZE];
	int tx_slot;
	int size;
	void *dev_id;
};

struct rio_msg_rx_ring {
	void *virt;
	dma_addr_t phys;
	void *virt_buffer[RIO_MAX_RX_RING_SIZE];
	int rx_slot;
	int size;
	void *dev_id;
};

struct rio_priv {
	void __iomem *regs_win;
	struct rio_atmu_regs __iomem *atmu_regs;
	struct rio_atmu_regs __iomem *maint_atmu_regs;
	struct rio_atmu_regs __iomem *dbell_atmu_regs;
	void __iomem *dbell_win;
	void __iomem *maint_win;
	struct rio_msg_regs __iomem *msg_regs;
	struct rio_dbell_ring dbell_ring;
	struct rio_msg_tx_ring msg_tx_ring;
	struct rio_msg_rx_ring msg_rx_ring;
	int bellirq;
	int txirq;
	int rxirq;
};

/**
 * fsl_rio_doorbell_send - Send a MPC85xx doorbell message
 * @index: ID of RapidIO interface
 * @destid: Destination ID of target device
 * @data: 16-bit info field of RapidIO doorbell message
 *
 * Sends a MPC85xx doorbell message. Returns %0 on success or
 * %-EINVAL on failure.
 */
static int fsl_rio_doorbell_send(struct rio_mport *mport,
				int index, u16 destid, u16 data)
{
	struct rio_priv *priv = mport->priv;
	pr_debug("fsl_doorbell_send: index %d destid %4.4x data %4.4x\n",
		 index, destid, data);
	out_be32(&priv->dbell_atmu_regs->rowtar, destid << 22);
	out_be16(priv->dbell_win, data);

	return 0;
}

/**
 * fsl_local_config_read - Generate a MPC85xx local config space read
 * @index: ID of RapdiIO interface
 * @offset: Offset into configuration space
 * @len: Length (in bytes) of the maintenance transaction
 * @data: Value to be read into
 *
 * Generates a MPC85xx local configuration space read. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int fsl_local_config_read(struct rio_mport *mport,
				int index, u32 offset, int len, u32