![Ruchika Gupta](/assets/img/avatar_default.png)
Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
418 lines
11 KiB
C
418 lines
11 KiB
C
/*
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* CAAM/SEC 4.x transport/backend driver
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* JobR backend functionality
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*
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* Copyright 2008-2012 Freescale Semiconductor, Inc.
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*/
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#include "compat.h"
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#include "regs.h"
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#include "jr.h"
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#include "desc.h"
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#include "intern.h"
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/* Main per-ring interrupt handler */
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static irqreturn_t caam_jr_interrupt(int irq, void *st_dev)
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{
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struct device *dev = st_dev;
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struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
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u32 irqstate;
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/*
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* Check the output ring for ready responses, kick
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* tasklet if jobs done.
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*/
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irqstate = rd_reg32(&jrp->rregs->jrintstatus);
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if (!irqstate)
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return IRQ_NONE;
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/*
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* If JobR error, we got more development work to do
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* Flag a bug now, but we really need to shut down and
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* restart the queue (and fix code).
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*/
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if (irqstate & JRINT_JR_ERROR) {
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dev_err(dev, "job ring error: irqstate: %08x\n", irqstate);
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BUG();
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}
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/* mask valid interrupts */
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setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
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/* Have valid interrupt at this point, just ACK and trigger */
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wr_reg32(&jrp->rregs->jrintstatus, irqstate);
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preempt_disable();
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tasklet_schedule(&jrp->irqtask);
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preempt_enable();
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return IRQ_HANDLED;
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}
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/* Deferred service handler, run as interrupt-fired tasklet */
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static void caam_jr_dequeue(unsigned long devarg)
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{
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int hw_idx, sw_idx, i, head, tail;
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struct device *dev = (struct device *)devarg;
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struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
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void (*usercall)(struct device *dev, u32 *desc, u32 status, void *arg);
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u32 *userdesc, userstatus;
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void *userarg;
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while (rd_reg32(&jrp->rregs->outring_used)) {
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head = ACCESS_ONCE(jrp->head);
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spin_lock(&jrp->outlock);
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sw_idx = tail = jrp->tail;
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hw_idx = jrp->out_ring_read_index;
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for (i = 0; CIRC_CNT(head, tail + i, JOBR_DEPTH) >= 1; i++) {
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sw_idx = (tail + i) & (JOBR_DEPTH - 1);
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smp_read_barrier_depends();
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if (jrp->outring[hw_idx].desc ==
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jrp->entinfo[sw_idx].desc_addr_dma)
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break; /* found */
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}
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/* we should never fail to find a matching descriptor */
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BUG_ON(CIRC_CNT(head, tail + i, JOBR_DEPTH) <= 0);
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/* Unmap just-run descriptor so we can post-process */
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dma_unmap_single(dev, jrp->outring[hw_idx].desc,
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jrp->entinfo[sw_idx].desc_size,
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DMA_TO_DEVICE);
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/* mark completed, avoid matching on a recycled desc addr */
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jrp->entinfo[sw_idx].desc_addr_dma = 0;
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/* Stash callback params for use outside of lock */
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usercall = jrp->entinfo[sw_idx].callbk;
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userarg = jrp->entinfo[sw_idx].cbkarg;
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userdesc = jrp->entinfo[sw_idx].desc_addr_virt;
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userstatus = jrp->outring[hw_idx].jrstatus;
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/* set done */
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wr_reg32(&jrp->rregs->outring_rmvd, 1);
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jrp->out_ring_read_index = (jrp->out_ring_read_index + 1) &
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(JOBR_DEPTH - 1);
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/*
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* if this job completed out-of-order, do not increment
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* the tail. Otherwise, increment tail by 1 plus the
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* number of subsequent jobs already completed out-of-order
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*/
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if (sw_idx == tail) {
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do {
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tail = (tail + 1) & (JOBR_DEPTH - 1);
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smp_read_barrier_depends();
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} while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 &&
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jrp->entinfo[tail].desc_addr_dma == 0);
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jrp->tail = tail;
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}
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spin_unlock(&jrp->outlock);
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/* Finally, execute user's callback */
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usercall(dev, userdesc, userstatus, userarg);
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}
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/* reenable / unmask IRQs */
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clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
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}
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/**
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* caam_jr_enqueue() - Enqueue a job descriptor head. Returns 0 if OK,
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* -EBUSY if the queue is full, -EIO if it cannot map the caller's
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* descriptor.
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* @dev: device of the job ring to be used. This device should have
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* been assigned prior by caam_jr_register().
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* @desc: points to a job descriptor that execute our request. All
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* descriptors (and all referenced data) must be in a DMAable
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* region, and all data references must be physical addresses
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* accessible to CAAM (i.e. within a PAMU window granted
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* to it).
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* @cbk: pointer to a callback function to be invoked upon completion
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* of this request. This has the form:
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* callback(struct device *dev, u32 *desc, u32 stat, void *arg)
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* where:
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* @dev: contains the job ring device that processed this
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* response.
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* @desc: descriptor that initiated the request, same as
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* "desc" being argued to caam_jr_enqueue().
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* @status: untranslated status received from CAAM. See the
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* reference manual for a detailed description of
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* error meaning, or see the JRSTA definitions in the
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* register header file
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* @areq: optional pointer to an argument passed with the
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* original request
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* @areq: optional pointer to a user argument for use at callback
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* time.
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**/
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int caam_jr_enqueue(struct device *dev, u32 *desc,
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void (*cbk)(struct device *dev, u32 *desc,
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u32 status, void *areq),
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void *areq)
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{
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struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
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struct caam_jrentry_info *head_entry;
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int head, tail, desc_size;
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dma_addr_t desc_dma;
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desc_size = (*desc & HDR_JD_LENGTH_MASK) * sizeof(u32);
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desc_dma = dma_map_single(dev, desc, desc_size, DMA_TO_DEVICE);
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if (dma_mapping_error(dev, desc_dma)) {
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dev_err(dev, "caam_jr_enqueue(): can't map jobdesc\n");
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return -EIO;
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}
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spin_lock_bh(&jrp->inplock);
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head = jrp->head;
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tail = ACCESS_ONCE(jrp->tail);
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if (!rd_reg32(&jrp->rregs->inpring_avail) ||
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CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) {
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spin_unlock_bh(&jrp->inplock);
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dma_unmap_single(dev, desc_dma, desc_size, DMA_TO_DEVICE);
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return -EBUSY;
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}
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head_entry = &jrp->entinfo[head];
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head_entry->desc_addr_virt = desc;
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head_entry->desc_size = desc_size;
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head_entry->callbk = (void *)cbk;
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head_entry->cbkarg = areq;
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head_entry->desc_addr_dma = desc_dma;
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jrp->inpring[jrp->inp_ring_write_index] = desc_dma;
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smp_wmb();
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jrp->inp_ring_write_index = (jrp->inp_ring_write_index + 1) &
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(JOBR_DEPTH - 1);
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jrp->head = (head + 1) & (JOBR_DEPTH - 1);
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wr_reg32(&jrp->rregs->inpring_jobadd, 1);
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spin_unlock_bh(&jrp->inplock);
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return 0;
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}
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EXPORT_SYMBOL(caam_jr_enqueue);
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static int caam_reset_hw_jr(struct device *dev)
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{
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struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
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unsigned int timeout = 100000;
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/*
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* mask interrupts since we are going to poll
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* for reset completion status
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*/
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setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
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/* initiate flush (required prior to reset) */
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wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
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while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) ==
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JRINT_ERR_HALT_INPROGRESS) && --timeout)
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cpu_relax();
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if ((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) !=
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JRINT_ERR_HALT_COMPLETE || timeout == 0) {
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dev_err(dev, "failed to flush job ring %d\n", jrp->ridx);
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return -EIO;
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}
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/* initiate reset */
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timeout = 100000;
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wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
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while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --timeout)
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cpu_relax();
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if (timeout == 0) {
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dev_err(dev, "failed to reset job ring %d\n", jrp->ridx);
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return -EIO;
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}
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/* unmask interrupts */
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clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
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return 0;
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}
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/*
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* Init JobR independent of platform property detection
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*/
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static int caam_jr_init(struct device *dev)
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{
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struct caam_drv_private_jr *jrp;
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dma_addr_t inpbusaddr, outbusaddr;
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int i, error;
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jrp = dev_get_drvdata(dev);
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tasklet_init(&jrp->irqtask, caam_jr_dequeue, (unsigned long)dev);
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/* Connect job ring interrupt handler. */
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error = request_irq(jrp->irq, caam_jr_interrupt, IRQF_SHARED,
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"caam-jobr", dev);
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if (error) {
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dev_err(dev, "can't connect JobR %d interrupt (%d)\n",
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jrp->ridx, jrp->irq);
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irq_dispose_mapping(jrp->irq);
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jrp->irq = 0;
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return -EINVAL;
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}
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error = caam_reset_hw_jr(dev);
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if (error)
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return error;
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jrp->inpring = dma_alloc_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
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&inpbusaddr, GFP_KERNEL);
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jrp->outring = dma_alloc_coherent(dev, sizeof(struct jr_outentry) *
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JOBR_DEPTH, &outbusaddr, GFP_KERNEL);
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jrp->entinfo = kzalloc(sizeof(struct caam_jrentry_info) * JOBR_DEPTH,
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GFP_KERNEL);
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if ((jrp->inpring == NULL) || (jrp->outring == NULL) ||
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(jrp->entinfo == NULL)) {
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dev_err(dev, "can't allocate job rings for %d\n",
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jrp->ridx);
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return -ENOMEM;
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}
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for (i = 0; i < JOBR_DEPTH; i++)
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jrp->entinfo[i].desc_addr_dma = !0;
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/* Setup rings */
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jrp->inp_ring_write_index = 0;
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jrp->out_ring_read_index = 0;
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jrp->head = 0;
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jrp->tail = 0;
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wr_reg64(&jrp->rregs->inpring_base, inpbusaddr);
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wr_reg64(&jrp->rregs->outring_base, outbusaddr);
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wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH);
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wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH);
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jrp->ringsize = JOBR_DEPTH;
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spin_lock_init(&jrp->inplock);
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spin_lock_init(&jrp->outlock);
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/* Select interrupt coalescing parameters */
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setbits32(&jrp->rregs->rconfig_lo, JOBR_INTC |
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(JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) |
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(JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT));
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return 0;
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}
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/*
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* Shutdown JobR independent of platform property code
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*/
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int caam_jr_shutdown(struct device *dev)
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{
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struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
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dma_addr_t inpbusaddr, outbusaddr;
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int ret;
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ret = caam_reset_hw_jr(dev);
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tasklet_kill(&jrp->irqtask);
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/* Release interrupt */
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free_irq(jrp->irq, dev);
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/* Free rings */
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inpbusaddr = rd_reg64(&jrp->rregs->inpring_base);
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outbusaddr = rd_reg64(&jrp->rregs->outring_base);
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dma_free_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
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jrp->inpring, inpbusaddr);
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dma_free_coherent(dev, sizeof(struct jr_outentry) * JOBR_DEPTH,
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jrp->outring, outbusaddr);
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kfree(jrp->entinfo);
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of_device_unregister(jrp->jr_pdev);
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return ret;
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}
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/*
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* Probe routine for each detected JobR subsystem. It assumes that
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* property detection was picked up externally.
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*/
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int caam_jr_probe(struct platform_device *pdev, struct device_node *np,
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int ring)
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{
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struct device *ctrldev, *jrdev;
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struct platform_device *jr_pdev;
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struct caam_drv_private *ctrlpriv;
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struct caam_drv_private_jr *jrpriv;
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u32 *jroffset;
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int error;
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ctrldev = &pdev->dev;
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ctrlpriv = dev_get_drvdata(ctrldev);
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jrpriv = kmalloc(sizeof(struct caam_drv_private_jr),
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GFP_KERNEL);
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if (jrpriv == NULL) {
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dev_err(ctrldev, "can't alloc private mem for job ring %d\n",
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ring);
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return -ENOMEM;
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}
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jrpriv->parentdev = ctrldev; /* point back to parent */
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jrpriv->ridx = ring; /* save ring identity relative to detection */
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/*
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* Derive a pointer to the detected JobRs regs
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* Driver has already iomapped the entire space, we just
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* need to add in the offset to this JobR. Don't know if I
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* like this long-term, but it'll run
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*/
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jroffset = (u32 *)of_get_property(np, "reg", NULL);
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jrpriv->rregs = (struct caam_job_ring __iomem *)((void *)ctrlpriv->ctrl
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+ *jroffset);
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/* Build a local dev for each detected queue */
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jr_pdev = of_platform_device_create(np, NULL, ctrldev);
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if (jr_pdev == NULL) {
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kfree(jrpriv);
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return -EINVAL;
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}
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jrpriv->jr_pdev = jr_pdev;
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jrdev = &jr_pdev->dev;
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dev_set_drvdata(jrdev, jrpriv);
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ctrlpriv->jrdev[ring] = jrdev;
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if (sizeof(dma_addr_t) == sizeof(u64))
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if (of_device_is_compatible(np, "fsl,sec-v5.0-job-ring"))
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dma_set_mask(jrdev, DMA_BIT_MASK(40));
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else
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dma_set_mask(jrdev, DMA_BIT_MASK(36));
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else
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dma_set_mask(jrdev, DMA_BIT_MASK(32));
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/* Identify the interrupt */
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jrpriv->irq = of_irq_to_resource(np, 0, NULL);
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/* Now do the platform independent part */
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error = caam_jr_init(jrdev); /* now turn on hardware */
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if (error) {
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of_device_unregister(jr_pdev);
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kfree(jrpriv);
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return error;
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}
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return error;
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}
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