diff options
Diffstat (limited to 'arch/powerpc/sysdev/fsl_rmu.c')
| -rw-r--r-- | arch/powerpc/sysdev/fsl_rmu.c | 1114 |
1 files changed, 1114 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..7a5e2e2b9 --- /dev/null +++ b/arch/powerpc/sysdev/fsl_rmu.c @@ -0,0 +1,1114 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 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> + */ + +#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; + } + 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; +} |