Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1119 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/fsl_rmu.c b/arch/powerpc/sysdev/fsl_rmu.c
new file mode 100644
index 000000000..88b35a3dc
--- /dev/null
+++ b/arch/powerpc/sysdev/fsl_rmu.c
@@ -0,0 +1,1119 @@
+/*
+ * Freescale MPC85xx/MPC86xx RapidIO RMU support
+ *
+ * Copyright 2009 Sysgo AG
+ * Thomas Moll <thomas.moll@sysgo.com>
+ * - fixed maintenance access routines, check for aligned access
+ *
+ * Copyright 2009 Integrated Device Technology, Inc.
+ * Alex Bounine <alexandre.bounine@idt.com>
+ * - Added Port-Write message handling
+ * - Added Machine Check exception handling
+ *
+ * Copyright (C) 2007, 2008, 2010, 2011 Freescale Semiconductor, Inc.
+ * Zhang Wei <wei.zhang@freescale.com>
+ * Lian Minghuan-B31939 <Minghuan.Lian@freescale.com>
+ * Liu Gang <Gang.Liu@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/types.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+
+#include "fsl_rio.h"
+
+#define GET_RMM_HANDLE(mport) \
+		(((struct rio_priv *)(mport->priv))->rmm_handle)
+
+/* RapidIO definition irq, which read from OF-tree */
+#define IRQ_RIO_PW(m)		(((struct fsl_rio_pw *)(m))->pwirq)
+#define IRQ_RIO_BELL(m) (((struct fsl_rio_dbell *)(m))->bellirq)
+#define IRQ_RIO_TX(m) (((struct fsl_rmu *)(GET_RMM_HANDLE(m)))->txirq)
+#define IRQ_RIO_RX(m) (((struct fsl_rmu *)(GET_RMM_HANDLE(m)))->rxirq)
+
+#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 RIO_IPWMR_SEN		0x00100000
+#define RIO_IPWMR_QFIE		0x00000100
+#define RIO_IPWMR_EIE		0x00000020
+#define RIO_IPWMR_CQ		0x00000002
+#define RIO_IPWMR_PWE		0x00000001
+
+#define RIO_IPWSR_QF		0x00100000
+#define RIO_IPWSR_TE		0x00000080
+#define RIO_IPWSR_QFI		0x00000010
+#define RIO_IPWSR_PWD		0x00000008
+#define RIO_IPWSR_PWB		0x00000004
+
+#define RIO_EPWISR		0x10010
+/* EPWISR Error match value */
+#define RIO_EPWISR_PINT1	0x80000000
+#define RIO_EPWISR_PINT2	0x40000000
+#define RIO_EPWISR_MU		0x00000002
+#define RIO_EPWISR_PW		0x00000001
+
+#define IPWSR_CLEAR		0x98
+#define OMSR_CLEAR		0x1cb3
+#define IMSR_CLEAR		0x491
+#define IDSR_CLEAR		0x91
+#define ODSR_CLEAR		0x1c00
+#define LTLEECSR_ENABLE_ALL	0xFFC000FC
+#define RIO_LTLEECSR		0x060c
+
+#define RIO_IM0SR		0x64
+#define RIO_IM1SR		0x164
+#define RIO_OM0SR		0x4
+#define RIO_OM1SR		0x104
+
+#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 DOORBELL_DMR_DI		0x00000002
+#define DOORBELL_DSR_TE		0x00000080
+#define DOORBELL_DSR_QFI	0x00000010
+#define DOORBELL_DSR_DIQI	0x00000001
+
+#define DOORBELL_MESSAGE_SIZE	0x08
+
+static DEFINE_SPINLOCK(fsl_rio_doorbell_lock);
+
+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;
+};
+
+struct rio_dbell_regs {
+	u32 odmr;
+	u32 odsr;
+	u32 pad1[4];
+	u32 oddpr;
+	u32 oddatr;
+	u32 pad2[3];
+	u32 odretcr;
+	u32 pad3[12];
+	u32 dmr;
+	u32 dsr;
+	u32 pad4;
+	u32 dqdpar;
+	u32 pad5;
+	u32 dqepar;
+};
+
+struct rio_pw_regs {
+	u32 pwmr;
+	u32 pwsr;
+	u32 epwqbar;
+	u32 pwqbar;
+};
+
+
+struct rio_tx_desc {
+	u32 pad1;
+	u32 saddr;
+	u32 dport;
+	u32 dattr;
+	u32 pad2;
+	u32 pad3;
+	u32 dwcnt;
+	u32 pad4;
+};
+
+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 fsl_rmu {
+	struct rio_msg_regs __iomem *msg_regs;
+	struct rio_msg_tx_ring msg_tx_ring;
+	struct rio_msg_rx_ring msg_rx_ring;
+	int txirq;
+	int rxirq;
+};
+
+struct rio_dbell_msg {
+	u16 pad1;
+	u16 tid;
+	u16 sid;
+	u16 info;
+};
+
+/**
+ * fsl_rio_tx_handler - MPC85xx outbound message interrupt handler
+ * @irq: Linux interrupt number
+ * @dev_instance: Pointer to interrupt-specific data
+ *
+ * Handles outbound message interrupts. Executes a register outbound
+ * mailbox event handler and acks the interrupt occurrence.
+ */
+static irqreturn_t
+fsl_rio_tx_handler(int irq, void *dev_instance)
+{
+	int osr;
+	struct rio_mport *port = (struct rio_mport *)dev_instance;
+	struct fsl_rmu *rmu = GET_RMM_HANDLE(port);
+
+	osr = in_be32(&rmu->msg_regs->osr);
+
+	if (osr & RIO_MSG_OSR_TE) {
+		pr_info("RIO: outbound message transmission error\n");
+		out_be32(&rmu->msg_regs->osr, RIO_MSG_OSR_TE);
+		goto out;
+	}
+
+	if (osr & RIO_MSG_OSR_QOI) {
+		pr_info("RIO: outbound message queue overflow\n");
+		out_be32(&rmu->msg_regs->osr, RIO_MSG_OSR_QOI);
+		goto out;
+	}
+
+	if (osr & RIO_MSG_OSR_EOMI) {
+		u32 dqp = in_be32(&rmu->msg_regs->odqdpar);
+		int slot = (dqp - rmu->msg_tx_ring.phys) >> 5;
+		if (port->outb_msg[0].mcback != NULL) {
+			port->outb_msg[0].mcback(port, rmu->msg_tx_ring.dev_id,
+					-1,
+					slot);
+		}
+		/* Ack the end-of-message interrupt */
+		out_be32(&rmu->msg_regs->osr, RIO_MSG_OSR_EOMI);
+	}
+
+out:
+	return IRQ_HANDLED;
+}
+
+/**
+ * fsl_rio_rx_handler - MPC85xx inbound message interrupt handler
+ * @irq: Linux interrupt number
+ * @dev_instance: Pointer to interrupt-specific data
+ *
+ * Handles inbound message interrupts. Executes a registered inbound
+ * mailbox event handler and acks the interrupt occurrence.
+ */
+static irqreturn_t
+fsl_rio_rx_handler(int irq, void *dev_instance)
+{
+	int isr;
+	struct rio_mport *port = (struct rio_mport *)dev_instance;
+	struct fsl_rmu *rmu = GET_RMM_HANDLE(port);
+
+	isr = in_be32(&rmu->msg_regs->isr);
+
+	if (isr & RIO_MSG_ISR_TE) {
+		pr_info("RIO: inbound message reception error\n");
+		out_be32((void *)&rmu->msg_regs->isr, RIO_MSG_ISR_TE);
+		goto out;
+	}
+
+	/* XXX Need to check/dispatch until queue empty */
+	if (isr & RIO_MSG_ISR_DIQI) {
+		/*
+		* Can receive messages for any mailbox/letter to that
+		* mailbox destination. So, make the callback with an
+		* unknown/invalid mailbox number argument.
+		*/
+		if (port->inb_msg[0].mcback != NULL)
+			port->inb_msg[0].mcback(port, rmu->msg_rx_ring.dev_id,
+				-1,
+				-1);
+
+		/* Ack the queueing interrupt */
+		out_be32(&rmu->msg_regs->isr, RIO_MSG_ISR_DIQI);
+	}
+
+out:
+	return IRQ_HANDLED;
+}
+
+/**
+ * fsl_rio_dbell_handler - MPC85xx doorbell interrupt handler
+ * @irq: Linux interrupt number
+ * @dev_instance: Pointer to interrupt-specific data
+ *
+ * Handles doorbell interrupts. Parses a list of registered
+ * doorbell event handlers and executes a matching event handler.
+ */
+static irqreturn_t
+fsl_rio_dbell_handler(int irq, void *dev_instance)
+{
+	int dsr;
+	struct fsl_rio_dbell *fsl_dbell = (struct fsl_rio_dbell *)dev_instance;
+	int i;
+
+	dsr = in_be32(&fsl_dbell->dbell_regs->dsr);
+
+	if (dsr & DOORBELL_DSR_TE) {
+		pr_info("RIO: doorbell reception error\n");
+		out_be32(&fsl_dbell->dbell_regs->dsr, DOORBELL_DSR_TE);
+		goto out;
+	}
+
+	if (dsr & DOORBELL_DSR_QFI) {
+		pr_info("RIO: doorbell queue full\n");
+		out_be32(&fsl_dbell->dbell_regs->dsr, DOORBELL_DSR_QFI);
+	}
+
+	/* XXX Need to check/dispatch until queue empty */
+	if (dsr & DOORBELL_DSR_DIQI) {
+		struct rio_dbell_msg *dmsg =
+			fsl_dbell->dbell_ring.virt +
+			(in_be32(&fsl_dbell->dbell_regs->dqdpar) & 0xfff);
+		struct rio_dbell *dbell;
+		int found = 0;
+
+		pr_debug
+			("RIO: processing doorbell,"
+			" sid %2.2x tid %2.2x info %4.4x\n",
+			dmsg->sid, dmsg->tid, dmsg->info);
+
+		for (i = 0; i < MAX_PORT_NUM; i++) {
+			if (fsl_dbell->mport[i]) {
+				list_for_each_entry(dbell,
+					&fsl_dbell->mport[i]->dbells, node) {
+					if ((dbell->res->start
+						<= dmsg->info)
+						&& (dbell->res->end
+						>= dmsg->info)) {
+						found = 1;
+						break;
+					}
+				}
+				if (found && dbell->dinb) {
+					dbell->dinb(fsl_dbell->mport[i],
+						dbell->dev_id, dmsg->sid,
+						dmsg->tid,
+						dmsg->info);
+					break;
+				}
+			}
+		}
+
+		if (!found) {
+			pr_debug
+				("RIO: spurious doorbell,"
+				" sid %2.2x tid %2.2x info %4.4x\n",
+				dmsg->sid, dmsg->tid,
+				dmsg->info);
+		}
+		setbits32(&fsl_dbell->dbell_regs->dmr, DOORBELL_DMR_DI);
+		out_be32(&fsl_dbell->dbell_regs->dsr, DOORBELL_DSR_DIQI);
+	}
+
+out:
+	return IRQ_HANDLED;
+}
+
+void msg_unit_error_handler(void)
+{
+
+	/*XXX: Error recovery is not implemented, we just clear errors */
+	out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR), 0);
+
+	out_be32((u32 *)(rmu_regs_win + RIO_IM0SR), IMSR_CLEAR);
+	out_be32((u32 *)(rmu_regs_win + RIO_IM1SR), IMSR_CLEAR);
+	out_be32((u32 *)(rmu_regs_win + RIO_OM0SR), OMSR_CLEAR);
+	out_be32((u32 *)(rmu_regs_win + RIO_OM1SR), OMSR_CLEAR);
+
+	out_be32(&dbell->dbell_regs->odsr, ODSR_CLEAR);
+	out_be32(&dbell->dbell_regs->dsr, IDSR_CLEAR);
+
+	out_be32(&pw->pw_regs->pwsr, IPWSR_CLEAR);
+}
+
+/**
+ * fsl_rio_port_write_handler - MPC85xx port write interrupt handler
+ * @irq: Linux interrupt number
+ * @dev_instance: Pointer to interrupt-specific data
+ *
+ * Handles port write interrupts. Parses a list of registered
+ * port write event handlers and executes a matching event handler.
+ */
+static irqreturn_t
+fsl_rio_port_write_handler(int irq, void *dev_instance)
+{
+	u32 ipwmr, ipwsr;
+	struct fsl_rio_pw *pw = (struct fsl_rio_pw *)dev_instance;
+	u32 epwisr, tmp;
+
+	epwisr = in_be32(rio_regs_win + RIO_EPWISR);
+	if (!(epwisr & RIO_EPWISR_PW))
+		goto pw_done;
+
+	ipwmr = in_be32(&pw->pw_regs->pwmr);
+	ipwsr = in_be32(&pw->pw_regs->pwsr);
+
+#ifdef DEBUG_PW
+	pr_debug("PW Int->IPWMR: 0x%08x IPWSR: 0x%08x (", ipwmr, ipwsr);
+	if (ipwsr & RIO_IPWSR_QF)
+		pr_debug(" QF");
+	if (ipwsr & RIO_IPWSR_TE)
+		pr_debug(" TE");
+	if (ipwsr & RIO_IPWSR_QFI)
+		pr_debug(" QFI");
+	if (ipwsr & RIO_IPWSR_PWD)
+		pr_debug(" PWD");
+	if (ipwsr & RIO_IPWSR_PWB)
+		pr_debug(" PWB");
+	pr_debug(" )\n");
+#endif
+	/* Schedule deferred processing if PW was received */
+	if (ipwsr & RIO_IPWSR_QFI) {
+		/* Save PW message (if there is room in FIFO),
+		 * otherwise discard it.
+		 */
+		if (kfifo_avail(&pw->pw_fifo) >= RIO_PW_MSG_SIZE) {
+			pw->port_write_msg.msg_count++;
+			kfifo_in(&pw->pw_fifo, pw->port_write_msg.virt,
+				 RIO_PW_MSG_SIZE);
+		} else {
+			pw->port_write_msg.discard_count++;
+			pr_debug("RIO: ISR Discarded Port-Write Msg(s) (%d)\n",
+				 pw->port_write_msg.discard_count);
+		}
+		/* Clear interrupt and issue Clear Queue command. This allows
+		 * another port-write to be received.
+		 */
+		out_be32(&pw->pw_regs->pwsr,	RIO_IPWSR_QFI);
+		out_be32(&pw->pw_regs->pwmr, ipwmr | RIO_IPWMR_CQ);
+
+		schedule_work(&pw->pw_work);
+	}
+
+	if ((ipwmr & RIO_IPWMR_EIE) && (ipwsr & RIO_IPWSR_TE)) {
+		pw->port_write_msg.err_count++;
+		pr_debug("RIO: Port-Write Transaction Err (%d)\n",
+			 pw->port_write_msg.err_count);
+		/* Clear Transaction Error: port-write controller should be
+		 * disabled when clearing this error
+		 */
+		out_be32(&pw->pw_regs->pwmr, ipwmr & ~RIO_IPWMR_PWE);
+		out_be32(&pw->pw_regs->pwsr,	RIO_IPWSR_TE);
+		out_be32(&pw->pw_regs->pwmr, ipwmr);
+	}
+
+	if (ipwsr & RIO_IPWSR_PWD) {
+		pw->port_write_msg.discard_count++;
+		pr_debug("RIO: Port Discarded Port-Write Msg(s) (%d)\n",
+			 pw->port_write_msg.discard_count);
+		out_be32(&pw->pw_regs->pwsr, RIO_IPWSR_PWD);
+	}
+
+pw_done:
+	if (epwisr & RIO_EPWISR_PINT1) {
+		tmp = in_be32(rio_regs_win + RIO_LTLEDCSR);
+		pr_debug("RIO_LTLEDCSR = 0x%x\n", tmp);
+		fsl_rio_port_error_handler(0);
+	}
+
+	if (epwisr & RIO_EPWISR_PINT2) {
+		tmp = in_be32(rio_regs_win + RIO_LTLEDCSR);
+		pr_debug("RIO_LTLEDCSR = 0x%x\n", tmp);
+		fsl_rio_port_error_handler(1);
+	}
+
+	if (epwisr & RIO_EPWISR_MU) {
+		tmp = in_be32(rio_regs_win + RIO_LTLEDCSR);
+		pr_debug("RIO_LTLEDCSR = 0x%x\n", tmp);
+		msg_unit_error_handler();
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void fsl_pw_dpc(struct work_struct *work)
+{
+	struct fsl_rio_pw *pw = container_of(work, struct fsl_rio_pw, pw_work);
+	union rio_pw_msg msg_buffer;
+	int i;
+
+	/*
+	 * Process port-write messages
+	 */
+	while (kfifo_out_spinlocked(&pw->pw_fifo, (unsigned char *)&msg_buffer,
+			 RIO_PW_MSG_SIZE, &pw->pw_fifo_lock)) {
+#ifdef DEBUG_PW
+		{
+		u32 i;
+		pr_debug("%s : Port-Write Message:", __func__);
+		for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32); i++) {
+			if ((i%4) == 0)
+				pr_debug("\n0x%02x: 0x%08x", i*4,
+					 msg_buffer.raw[i]);
+			else
+				pr_debug(" 0x%08x", msg_buffer.raw[i]);
+		}
+		pr_debug("\n");
+		}
+#endif
+		/* Pass the port-write message to RIO core for processing */
+		for (i = 0; i < MAX_PORT_NUM; i++) {
+			if (pw->mport[i])
+				rio_inb_pwrite_handler(pw->mport[i],
+						       &msg_buffer);
+		}
+	}
+}
+
+/**
+ * fsl_rio_pw_enable - enable/disable port-write interface init
+ * @mport: Master port implementing the port write unit
+ * @enable:    1=enable; 0=disable port-write message handling
+ */
+int fsl_rio_pw_enable(struct rio_mport *mport, int enable)
+{
+	u32 rval;
+
+	rval = in_be32(&pw->pw_regs->pwmr);
+
+	if (enable)
+		rval |= RIO_IPWMR_PWE;
+	else
+		rval &= ~RIO_IPWMR_PWE;
+
+	out_be32(&pw->pw_regs->pwmr, rval);
+
+	return 0;
+}
+
+/**
+ * fsl_rio_port_write_init - MPC85xx port write interface init
+ * @mport: Master port implementing the port write unit
+ *
+ * Initializes port write unit hardware and DMA buffer
+ * ring. Called from fsl_rio_setup(). Returns %0 on success
+ * or %-ENOMEM on failure.
+ */
+
+int fsl_rio_port_write_init(struct fsl_rio_pw *pw)
+{
+	int rc = 0;
+
+	/* Following configurations require a disabled port write controller */
+	out_be32(&pw->pw_regs->pwmr,
+		 in_be32(&pw->pw_regs->pwmr) & ~RIO_IPWMR_PWE);
+
+	/* Initialize port write */
+	pw->port_write_msg.virt = dma_alloc_coherent(pw->dev,
+					RIO_PW_MSG_SIZE,
+					&pw->port_write_msg.phys, GFP_KERNEL);
+	if (!pw->port_write_msg.virt) {
+		pr_err("RIO: unable allocate port write queue\n");
+		return -ENOMEM;
+	}
+
+	pw->port_write_msg.err_count = 0;
+	pw->port_write_msg.discard_count = 0;
+
+	/* Point dequeue/enqueue pointers at first entry */
+	out_be32(&pw->pw_regs->epwqbar, 0);
+	out_be32(&pw->pw_regs->pwqbar, (u32) pw->port_write_msg.phys);
+
+	pr_debug("EIPWQBAR: 0x%08x IPWQBAR: 0x%08x\n",
+		 in_be32(&pw->pw_regs->epwqbar),
+		 in_be32(&pw->pw_regs->pwqbar));
+
+	/* Clear interrupt status IPWSR */
+	out_be32(&pw->pw_regs->pwsr,
+		 (RIO_IPWSR_TE | RIO_IPWSR_QFI | RIO_IPWSR_PWD));
+
+	/* Configure port write controller for snooping enable all reporting,
+	   clear queue full */
+	out_be32(&pw->pw_regs->pwmr,
+		 RIO_IPWMR_SEN | RIO_IPWMR_QFIE | RIO_IPWMR_EIE | RIO_IPWMR_CQ);
+
+
+	/* Hook up port-write handler */
+	rc = request_irq(IRQ_RIO_PW(pw), fsl_rio_port_write_handler,
+			IRQF_SHARED, "port-write", (void *)pw);
+	if (rc < 0) {
+		pr_err("MPC85xx RIO: unable to request inbound doorbell irq");
+		goto err_out;
+	}
+	/* Enable Error Interrupt */
+	out_be32((u32 *)(rio_regs_win + RIO_LTLEECSR), LTLEECSR_ENABLE_ALL);
+
+	INIT_WORK(&pw->pw_work, fsl_pw_dpc);
+	spin_lock_init(&pw->pw_fifo_lock);
+	if (kfifo_alloc(&pw->pw_fifo, RIO_PW_MSG_SIZE * 32, GFP_KERNEL)) {
+		pr_err("FIFO allocation failed\n");
+		rc = -ENOMEM;
+		goto err_out_irq;
+	}
+
+	pr_debug("IPWMR: 0x%08x IPWSR: 0x%08x\n",
+		 in_be32(&pw->pw_regs->pwmr),
+		 in_be32(&pw->pw_regs->pwsr));
+
+	return rc;
+
+err_out_irq:
+	free_irq(IRQ_RIO_PW(pw), (void *)pw);
+err_out:
+	dma_free_coherent(pw->dev, RIO_PW_MSG_SIZE,
+		pw->port_write_msg.virt,
+		pw->port_write_msg.phys);
+	return rc;
+}
+
+/**
+ * fsl_rio_doorbell_send - Send a MPC85xx doorbell message
+ * @mport: RapidIO master port info
+ * @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.
+ */
+int fsl_rio_doorbell_send(struct rio_mport *mport,
+				int index, u16 destid, u16 data)
+{
+	unsigned long flags;
+
+	pr_debug("fsl_doorbell_send: index %d destid %4.4x data %4.4x\n",
+		 index, destid, data);
+
+	spin_lock_irqsave(&fsl_rio_doorbell_lock, flags);
+
+	/* In the serial version silicons, such as MPC8548, MPC8641,
+	 * below operations is must be.
+	 */
+	out_be32(&dbell->dbell_regs->odmr, 0x00000000);
+	out_be32(&dbell->dbell_regs->odretcr, 0x00000004);
+	out_be32(&dbell->dbell_regs->oddpr, destid << 16);
+	out_be32(&dbell->dbell_regs->oddatr, (index << 20) | data);
+	out_be32(&dbell->dbell_regs->odmr, 0x00000001);
+
+	spin_unlock_irqrestore(&fsl_rio_doorbell_lock, flags);
+
+	return 0;
+}
+
+/**
+ * fsl_add_outb_message - Add message to the MPC85xx outbound message queue
+ * @mport: Master port with outbound message queue
+ * @rdev: Target of outbound message
+ * @mbox: Outbound mailbox
+ * @buffer: Message to add to outbound queue
+ * @len: Length of message
+ *
+ * Adds the @buffer message to the MPC85xx outbound message queue. Returns
+ * %0 on success or %-EINVAL on failure.
+ */
+int
+fsl_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
+			void *buffer, size_t len)
+{
+	struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
+	u32 omr;
+	struct rio_tx_desc *desc = (struct rio_tx_desc *)rmu->msg_tx_ring.virt
+					+ rmu->msg_tx_ring.tx_slot;
+	int ret = 0;
+
+	pr_debug("RIO: fsl_add_outb_message(): destid %4.4x mbox %d buffer " \
+		 "%p len %8.8zx\n", rdev->destid, mbox, buffer, len);
+	if ((len < 8) || (len > RIO_MAX_MSG_SIZE)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* Copy and clear rest of buffer */
+	memcpy(rmu->msg_tx_ring.virt_buffer[rmu->msg_tx_ring.tx_slot], buffer,
+			len);
+	if (len < (RIO_MAX_MSG_SIZE - 4))
+		memset(rmu->msg_tx_ring.virt_buffer[rmu->msg_tx_ring.tx_slot]
+				+ len, 0, RIO_MAX_MSG_SIZE - len);
+
+	/* Set mbox field for message, and set destid */
+	desc->dport = (rdev->destid << 16) | (mbox & 0x3);
+
+	/* Enable EOMI interrupt and priority */
+	desc->dattr = 0x28000000 | ((mport->index) << 20);
+
+	/* Set transfer size aligned to next power of 2 (in double words) */
+	desc->dwcnt = is_power_of_2(len) ? len : 1 << get_bitmask_order(len);
+
+	/* Set snooping and source buffer address */
+	desc->saddr = 0x00000004
+		| rmu->msg_tx_ring.phys_buffer[rmu->msg_tx_ring.tx_slot];
+
+	/* Increment enqueue pointer */
+	omr = in_be32(&rmu->msg_regs->omr);
+	out_be32(&rmu->msg_regs->omr, omr | RIO_MSG_OMR_MUI);
+
+	/* Go to next descriptor */
+	if (++rmu->msg_tx_ring.tx_slot == rmu->msg_tx_ring.size)
+		rmu->msg_tx_ring.tx_slot = 0;
+
+out:
+	return ret;
+}
+
+/**
+ * fsl_open_outb_mbox - Initialize MPC85xx outbound mailbox
+ * @mport: Master port implementing the outbound message unit
+ * @dev_id: Device specific pointer to pass on event
+ * @mbox: Mailbox to open
+ * @entries: Number of entries in the outbound mailbox ring
+ *
+ * Initializes buffer ring, request the outbound message interrupt,
+ * and enables the outbound message unit. Returns %0 on success and
+ * %-EINVAL or %-ENOMEM on failure.
+ */
+int
+fsl_open_outb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries)
+{
+	int i, j, rc = 0;
+	struct rio_priv *priv = mport->priv;
+	struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
+
+	if ((entries < RIO_MIN_TX_RING_SIZE) ||
+		(entries > RIO_MAX_TX_RING_SIZE) || (!is_power_of_2(entries))) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/* Initialize shadow copy ring */
+	rmu->msg_tx_ring.dev_id = dev_id;
+	rmu->msg_tx_ring.size = entries;
+
+	for (i = 0; i < rmu->msg_tx_ring.size; i++) {
+		rmu->msg_tx_ring.virt_buffer[i] =
+			dma_alloc_coherent(priv->dev, RIO_MSG_BUFFER_SIZE,
+				&rmu->msg_tx_ring.phys_buffer[i], GFP_KERNEL);
+		if (!rmu->msg_tx_ring.virt_buffer[i]) {
+			rc = -ENOMEM;
+			for (j = 0; j < rmu->msg_tx_ring.size; j++)
+				if (rmu->msg_tx_ring.virt_buffer[j])
+					dma_free_coherent(priv->dev,
+							RIO_MSG_BUFFER_SIZE,
+							rmu->msg_tx_ring.
+							virt_buffer[j],
+							rmu->msg_tx_ring.
+							phys_buffer[j]);
+			goto out;
+		}
+	}
+
+	/* Initialize outbound message descriptor ring */
+	rmu->msg_tx_ring.virt = dma_alloc_coherent(priv->dev,
+				rmu->msg_tx_ring.size * RIO_MSG_DESC_SIZE,
+				&rmu->msg_tx_ring.phys, GFP_KERNEL);
+	if (!rmu->msg_tx_ring.virt) {
+		rc = -ENOMEM;
+		goto out_dma;
+	}
+	memset(rmu->msg_tx_ring.virt, 0,
+			rmu->msg_tx_ring.size * RIO_MSG_DESC_SIZE);
+	rmu->msg_tx_ring.tx_slot = 0;
+
+	/* Point dequeue/enqueue pointers at first entry in ring */
+	out_be32(&rmu->msg_regs->odqdpar, rmu->msg_tx_ring.phys);
+	out_be32(&rmu->msg_regs->odqepar, rmu->msg_tx_ring.phys);
+
+	/* Configure for snooping */
+	out_be32(&rmu->msg_regs->osar, 0x00000004);
+
+	/* Clear interrupt status */
+	out_be32(&rmu->msg_regs->osr, 0x000000b3);
+
+	/* Hook up outbound message handler */
+	rc = request_irq(IRQ_RIO_TX(mport), fsl_rio_tx_handler, 0,
+			 "msg_tx", (void *)mport);
+	if (rc < 0)
+		goto out_irq;
+
+	/*
+	 * Configure outbound message unit
+	 *      Snooping
+	 *      Interrupts (all enabled, except QEIE)
+	 *      Chaining mode
+	 *      Disable
+	 */
+	out_be32(&rmu->msg_regs->omr, 0x00100220);
+
+	/* Set number of entries */
+	out_be32(&rmu->msg_regs->omr,
+		 in_be32(&rmu->msg_regs->omr) |
+		 ((get_bitmask_order(entries) - 2) << 12));
+
+	/* Now enable the unit */
+	out_be32(&rmu->msg_regs->omr, in_be32(&rmu->msg_regs->omr) | 0x1);
+
+out:
+	return rc;
+
+out_irq:
+	dma_free_coherent(priv->dev,
+		rmu->msg_tx_ring.size * RIO_MSG_DESC_SIZE,
+		rmu->msg_tx_ring.virt, rmu->msg_tx_ring.phys);
+
+out_dma:
+	for (i = 0; i < rmu->msg_tx_ring.size; i++)
+		dma_free_coherent(priv->dev, RIO_MSG_BUFFER_SIZE,
+		rmu->msg_tx_ring.virt_buffer[i],
+		rmu->msg_tx_ring.phys_buffer[i]);
+
+	return rc;
+}
+
+/**
+ * fsl_close_outb_mbox - Shut down MPC85xx outbound mailbox
+ * @mport: Master port implementing the outbound message unit
+ * @mbox: Mailbox to close
+ *
+ * Disables the outbound message unit, free all buffers, and
+ * frees the outbound message interrupt.
+ */
+void fsl_close_outb_mbox(struct rio_mport *mport, int mbox)
+{
+	struct rio_priv *priv = mport->priv;
+	struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
+
+	/* Disable inbound message unit */
+	out_be32(&rmu->msg_regs->omr, 0);
+
+	/* Free ring */
+	dma_free_coherent(priv->dev,
+	rmu->msg_tx_ring.size * RIO_MSG_DESC_SIZE,
+	rmu->msg_tx_ring.virt, rmu->msg_tx_ring.phys);
+
+	/* Free interrupt */
+	free_irq(IRQ_RIO_TX(mport), (void *)mport);
+}
+
+/**
+ * fsl_open_inb_mbox - Initialize MPC85xx inbound mailbox
+ * @mport: Master port implementing the inbound message unit
+ * @dev_id: Device specific pointer to pass on event
+ * @mbox: Mailbox to open
+ * @entries: Number of entries in the inbound mailbox ring
+ *
+ * Initializes buffer ring, request the inbound message interrupt,
+ * and enables the inbound message unit. Returns %0 on success
+ * and %-EINVAL or %-ENOMEM on failure.
+ */
+int
+fsl_open_inb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries)
+{
+	int i, rc = 0;
+	struct rio_priv *priv = mport->priv;
+	struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
+
+	if ((entries < RIO_MIN_RX_RING_SIZE) ||
+		(entries > RIO_MAX_RX_RING_SIZE) || (!is_power_of_2(entries))) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	/* Initialize client buffer ring */
+	rmu->msg_rx_ring.dev_id = dev_id;
+	rmu->msg_rx_ring.size = entries;
+	rmu->msg_rx_ring.rx_slot = 0;
+	for (i = 0; i < rmu->msg_rx_ring.size; i++)
+		rmu->msg_rx_ring.virt_buffer[i] = NULL;
+
+	/* Initialize inbound message ring */
+	rmu->msg_rx_ring.virt = dma_alloc_coherent(priv->dev,
+				rmu->msg_rx_ring.size * RIO_MAX_MSG_SIZE,
+				&rmu->msg_rx_ring.phys, GFP_KERNEL);
+	if (!rmu->msg_rx_ring.virt) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	/* Point dequeue/enqueue pointers at first entry in ring */
+	out_be32(&rmu->msg_regs->ifqdpar, (u32) rmu->msg_rx_ring.phys);
+	out_be32(&rmu->msg_regs->ifqepar, (u32) rmu->msg_rx_ring.phys);
+
+	/* Clear interrupt status */
+	out_be32(&rmu->msg_regs->isr, 0x00000091);
+
+	/* Hook up inbound message handler */
+	rc = request_irq(IRQ_RIO_RX(mport), fsl_rio_rx_handler, 0,
+			 "msg_rx", (void *)mport);
+	if (rc < 0) {
+		dma_free_coherent(priv->dev,
+			rmu->msg_rx_ring.size * RIO_MAX_MSG_SIZE,
+			rmu->msg_rx_ring.virt, rmu->msg_rx_ring.phys);
+		goto out;
+	}
+
+	/*
+	 * Configure inbound message unit:
+	 *      Snooping
+	 *      4KB max message size
+	 *      Unmask all interrupt sources
+	 *      Disable
+	 */
+	out_be32(&rmu->msg_regs->imr, 0x001b0060);
+
+	/* Set number of queue entries */
+	setbits32(&rmu->msg_regs->imr, (get_bitmask_order(entries) - 2) << 12);
+
+	/* Now enable the unit */
+	setbits32(&rmu->msg_regs->imr, 0x1);
+
+out:
+	return rc;
+}
+
+/**
+ * fsl_close_inb_mbox - Shut down MPC85xx inbound mailbox
+ * @mport: Master port implementing the inbound message unit
+ * @mbox: Mailbox to close
+ *
+ * Disables the inbound message unit, free all buffers, and
+ * frees the inbound message interrupt.
+ */
+void fsl_close_inb_mbox(struct rio_mport *mport, int mbox)
+{
+	struct rio_priv *priv = mport->priv;
+	struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
+
+	/* Disable inbound message unit */
+	out_be32(&rmu->msg_regs->imr, 0);
+
+	/* Free ring */
+	dma_free_coherent(priv->dev, rmu->msg_rx_ring.size * RIO_MAX_MSG_SIZE,
+	rmu->msg_rx_ring.virt, rmu->msg_rx_ring.phys);
+
+	/* Free interrupt */
+	free_irq(IRQ_RIO_RX(mport), (void *)mport);
+}
+
+/**
+ * fsl_add_inb_buffer - Add buffer to the MPC85xx inbound message queue
+ * @mport: Master port implementing the inbound message unit
+ * @mbox: Inbound mailbox number
+ * @buf: Buffer to add to inbound queue
+ *
+ * Adds the @buf buffer to the MPC85xx inbound message queue. Returns
+ * %0 on success or %-EINVAL on failure.
+ */
+int fsl_add_inb_buffer(struct rio_mport *mport, int mbox, void *buf)
+{
+	int rc = 0;
+	struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
+
+	pr_debug("RIO: fsl_add_inb_buffer(), msg_rx_ring.rx_slot %d\n",
+		 rmu->msg_rx_ring.rx_slot);
+
+	if (rmu->msg_rx_ring.virt_buffer[rmu->msg_rx_ring.rx_slot]) {
+		printk(KERN_ERR
+			"RIO: error adding inbound buffer %d, buffer exists\n",
+			rmu->msg_rx_ring.rx_slot);
+		rc = -EINVAL;
+		goto out;
+	}
+
+	rmu->msg_rx_ring.virt_buffer[rmu->msg_rx_ring.rx_slot] = buf;
+	if (++rmu->msg_rx_ring.rx_slot == rmu->msg_rx_ring.size)
+		rmu->msg_rx_ring.rx_slot = 0;
+
+out:
+	return rc;
+}
+
+/**
+ * fsl_get_inb_message - Fetch inbound message from the MPC85xx message unit
+ * @mport: Master port implementing the inbound message unit
+ * @mbox: Inbound mailbox number
+ *
+ * Gets the next available inbound message from the inbound message queue.
+ * A pointer to the message is returned on success or NULL on failure.
+ */
+void *fsl_get_inb_message(struct rio_mport *mport, int mbox)
+{
+	struct fsl_rmu *rmu = GET_RMM_HANDLE(mport);
+	u32 phys_buf;
+	void *virt_buf;
+	void *buf = NULL;
+	int buf_idx;
+
+	phys_buf = in_be32(&rmu->msg_regs->ifqdpar);
+
+	/* If no more messages, then bail out */
+	if (phys_buf == in_be32(&rmu->msg_regs->ifqepar))
+		goto out2;
+
+	virt_buf = rmu->msg_rx_ring.virt + (phys_buf
+						- rmu->msg_rx_ring.phys);
+	buf_idx = (phys_buf - rmu->msg_rx_ring.phys) / RIO_MAX_MSG_SIZE;
+	buf = rmu->msg_rx_ring.virt_buffer[buf_idx];
+
+	if (!buf) {
+		printk(KERN_ERR
+			"RIO: inbound message copy failed, no buffers\n");
+		goto out1;
+	}
+
+	/* Copy max message size, caller is expected to allocate that big */
+	memcpy(buf, virt_buf, RIO_MAX_MSG_SIZE);
+
+	/* Clear the available buffer */
+	rmu->msg_rx_ring.virt_buffer[buf_idx] = NULL;
+
+out1:
+	setbits32(&rmu->msg_regs->imr, RIO_MSG_IMR_MI);
+
+out2:
+	return buf;
+}
+
+/**
+ * fsl_rio_doorbell_init - MPC85xx doorbell interface init
+ * @mport: Master port implementing the inbound doorbell unit
+ *
+ * Initializes doorbell unit hardware and inbound DMA buffer
+ * ring. Called from fsl_rio_setup(). Returns %0 on success
+ * or %-ENOMEM on failure.
+ */
+int fsl_rio_doorbell_init(struct fsl_rio_dbell *dbell)
+{
+	int rc = 0;
+
+	/* Initialize inbound doorbells */
+	dbell->dbell_ring.virt = dma_alloc_coherent(dbell->dev, 512 *
+		DOORBELL_MESSAGE_SIZE, &dbell->dbell_ring.phys, GFP_KERNEL);
+	if (!dbell->dbell_ring.virt) {
+		printk(KERN_ERR "RIO: unable allocate inbound doorbell ring\n");
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	/* Point dequeue/enqueue pointers at first entry in ring */
+	out_be32(&dbell->dbell_regs->dqdpar, (u32) dbell->dbell_ring.phys);
+	out_be32(&dbell->dbell_regs->dqepar, (u32) dbell->dbell_ring.phys);
+
+	/* Clear interrupt status */
+	out_be32(&dbell->dbell_regs->dsr, 0x00000091);
+
+	/* Hook up doorbell handler */
+	rc = request_irq(IRQ_RIO_BELL(dbell), fsl_rio_dbell_handler, 0,
+			 "dbell_rx", (void *)dbell);
+	if (rc < 0) {
+		dma_free_coherent(dbell->dev, 512 * DOORBELL_MESSAGE_SIZE,
+			 dbell->dbell_ring.virt, dbell->dbell_ring.phys);
+		printk(KERN_ERR
+			"MPC85xx RIO: unable to request inbound doorbell irq");
+		goto out;
+	}
+
+	/* Configure doorbells for snooping, 512 entries, and enable */
+	out_be32(&dbell->dbell_regs->dmr, 0x00108161);
+
+out:
+	return rc;
+}
+
+int fsl_rio_setup_rmu(struct rio_mport *mport, struct device_node *node)
+{
+	struct rio_priv *priv;
+	struct fsl_rmu *rmu;
+	u64 msg_start;
+	const u32 *msg_addr;
+	int mlen;
+	int aw;
+
+	if (!mport || !mport->priv)
+		return -EINVAL;
+
+	priv = mport->priv;
+
+	if (!node) {
+		dev_warn(priv->dev, "Can't get %pOF property 'fsl,rmu'\n",
+			priv->dev->of_node);
+		return -EINVAL;
+	}
+
+	rmu = kzalloc(sizeof(struct fsl_rmu), GFP_KERNEL);
+	if (!rmu)
+		return -ENOMEM;
+
+	aw = of_n_addr_cells(node);
+	msg_addr = of_get_property(node, "reg", &mlen);
+	if (!msg_addr) {
+		pr_err("%pOF: unable to find 'reg' property of message-unit\n",
+			node);
+		kfree(rmu);
+		return -ENOMEM;
+	}
+	msg_start = of_read_number(msg_addr, aw);
+
+	rmu->msg_regs = (struct rio_msg_regs *)
+			(rmu_regs_win + (u32)msg_start);
+
+	rmu->txirq = irq_of_parse_and_map(node, 0);
+	rmu->rxirq = irq_of_parse_and_map(node, 1);
+	printk(KERN_INFO "%pOF: txirq: %d, rxirq %d\n",
+		node, rmu->txirq, rmu->rxirq);
+
+	priv->rmm_handle = rmu;
+
+	rio_init_dbell_res(&mport->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff);
+	rio_init_mbox_res(&mport->riores[RIO_INB_MBOX_RESOURCE], 0, 0);
+	rio_init_mbox_res(&mport->riores[RIO_OUTB_MBOX_RESOURCE], 0, 0);
+
+	return 0;
+}