swh:1:snp:49cd9498d6cccc5e78252c27dcb645bcf7bf0c91
Tip revision: 38dbfb59d1175ef458d006556061adeaa8751b72 authored by Linus Torvalds on 03 February 2014, 00:42:13 UTC
Linus 3.14-rc1
Linus 3.14-rc1
Tip revision: 38dbfb5
jr.c
/*
* CAAM/SEC 4.x transport/backend driver
* JobR backend functionality
*
* Copyright 2008-2012 Freescale Semiconductor, Inc.
*/
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include "compat.h"
#include "regs.h"
#include "jr.h"
#include "desc.h"
#include "intern.h"
struct jr_driver_data {
/* List of Physical JobR's with the Driver */
struct list_head jr_list;
spinlock_t jr_alloc_lock; /* jr_list lock */
} ____cacheline_aligned;
static struct jr_driver_data driver_data;
static int caam_reset_hw_jr(struct device *dev)
{
struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
unsigned int timeout = 100000;
/*
* mask interrupts since we are going to poll
* for reset completion status
*/
setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
/* initiate flush (required prior to reset) */
wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) ==
JRINT_ERR_HALT_INPROGRESS) && --timeout)
cpu_relax();
if ((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) !=
JRINT_ERR_HALT_COMPLETE || timeout == 0) {
dev_err(dev, "failed to flush job ring %d\n", jrp->ridx);
return -EIO;
}
/* initiate reset */
timeout = 100000;
wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --timeout)
cpu_relax();
if (timeout == 0) {
dev_err(dev, "failed to reset job ring %d\n", jrp->ridx);
return -EIO;
}
/* unmask interrupts */
clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
return 0;
}
/*
* Shutdown JobR independent of platform property code
*/
int caam_jr_shutdown(struct device *dev)
{
struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
dma_addr_t inpbusaddr, outbusaddr;
int ret;
ret = caam_reset_hw_jr(dev);
tasklet_kill(&jrp->irqtask);
/* Release interrupt */
free_irq(jrp->irq, dev);
/* Free rings */
inpbusaddr = rd_reg64(&jrp->rregs->inpring_base);
outbusaddr = rd_reg64(&jrp->rregs->outring_base);
dma_free_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
jrp->inpring, inpbusaddr);
dma_free_coherent(dev, sizeof(struct jr_outentry) * JOBR_DEPTH,
jrp->outring, outbusaddr);
kfree(jrp->entinfo);
return ret;
}
static int caam_jr_remove(struct platform_device *pdev)
{
int ret;
struct device *jrdev;
struct caam_drv_private_jr *jrpriv;
jrdev = &pdev->dev;
jrpriv = dev_get_drvdata(jrdev);
/*
* Return EBUSY if job ring already allocated.
*/
if (atomic_read(&jrpriv->tfm_count)) {
dev_err(jrdev, "Device is busy\n");
return -EBUSY;
}
/* Remove the node from Physical JobR list maintained by driver */
spin_lock(&driver_data.jr_alloc_lock);
list_del(&jrpriv->list_node);
spin_unlock(&driver_data.jr_alloc_lock);
/* Release ring */
ret = caam_jr_shutdown(jrdev);
if (ret)
dev_err(jrdev, "Failed to shut down job ring\n");
irq_dispose_mapping(jrpriv->irq);
return ret;
}
/* Main per-ring interrupt handler */
static irqreturn_t caam_jr_interrupt(int irq, void *st_dev)
{
struct device *dev = st_dev;
struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
u32 irqstate;
/*
* Check the output ring for ready responses, kick
* tasklet if jobs done.
*/
irqstate = rd_reg32(&jrp->rregs->jrintstatus);
if (!irqstate)
return IRQ_NONE;
/*
* If JobR error, we got more development work to do
* Flag a bug now, but we really need to shut down and
* restart the queue (and fix code).
*/
if (irqstate & JRINT_JR_ERROR) {
dev_err(dev, "job ring error: irqstate: %08x\n", irqstate);
BUG();
}
/* mask valid interrupts */
setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
/* Have valid interrupt at this point, just ACK and trigger */
wr_reg32(&jrp->rregs->jrintstatus, irqstate);
preempt_disable();
tasklet_schedule(&jrp->irqtask);
preempt_enable();
return IRQ_HANDLED;
}
/* Deferred service handler, run as interrupt-fired tasklet */
static void caam_jr_dequeue(unsigned long devarg)
{
int hw_idx, sw_idx, i, head, tail;
struct device *dev = (struct device *)devarg;
struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
void (*usercall)(struct device *dev, u32 *desc, u32 status, void *arg);
u32 *userdesc, userstatus;
void *userarg;
while (rd_reg32(&jrp->rregs->outring_used)) {
head = ACCESS_ONCE(jrp->head);
spin_lock(&jrp->outlock);
sw_idx = tail = jrp->tail;
hw_idx = jrp->out_ring_read_index;
for (i = 0; CIRC_CNT(head, tail + i, JOBR_DEPTH) >= 1; i++) {
sw_idx = (tail + i) & (JOBR_DEPTH - 1);
smp_read_barrier_depends();
if (jrp->outring[hw_idx].desc ==
jrp->entinfo[sw_idx].desc_addr_dma)
break; /* found */
}
/* we should never fail to find a matching descriptor */
BUG_ON(CIRC_CNT(head, tail + i, JOBR_DEPTH) <= 0);
/* Unmap just-run descriptor so we can post-process */
dma_unmap_single(dev, jrp->outring[hw_idx].desc,
jrp->entinfo[sw_idx].desc_size,
DMA_TO_DEVICE);
/* mark completed, avoid matching on a recycled desc addr */
jrp->entinfo[sw_idx].desc_addr_dma = 0;
/* Stash callback params for use outside of lock */
usercall = jrp->entinfo[sw_idx].callbk;
userarg = jrp->entinfo[sw_idx].cbkarg;
userdesc = jrp->entinfo[sw_idx].desc_addr_virt;
userstatus = jrp->outring[hw_idx].jrstatus;
/* set done */
wr_reg32(&jrp->rregs->outring_rmvd, 1);
jrp->out_ring_read_index = (jrp->out_ring_read_index + 1) &
(JOBR_DEPTH - 1);
/*
* if this job completed out-of-order, do not increment
* the tail. Otherwise, increment tail by 1 plus the
* number of subsequent jobs already completed out-of-order
*/
if (sw_idx == tail) {
do {
tail = (tail + 1) & (JOBR_DEPTH - 1);
smp_read_barrier_depends();
} while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 &&
jrp->entinfo[tail].desc_addr_dma == 0);
jrp->tail = tail;
}
spin_unlock(&jrp->outlock);
/* Finally, execute user's callback */
usercall(dev, userdesc, userstatus, userarg);
}
/* reenable / unmask IRQs */
clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
}
/**
* caam_jr_alloc() - Alloc a job ring for someone to use as needed.
*
* returns : pointer to the newly allocated physical
* JobR dev can be written to if successful.
**/
struct device *caam_jr_alloc(void)
{
struct caam_drv_private_jr *jrpriv, *min_jrpriv = NULL;
struct device *dev = NULL;
int min_tfm_cnt = INT_MAX;
int tfm_cnt;
spin_lock(&driver_data.jr_alloc_lock);
if (list_empty(&driver_data.jr_list)) {
spin_unlock(&driver_data.jr_alloc_lock);
return ERR_PTR(-ENODEV);
}
list_for_each_entry(jrpriv, &driver_data.jr_list, list_node) {
tfm_cnt = atomic_read(&jrpriv->tfm_count);
if (tfm_cnt < min_tfm_cnt) {
min_tfm_cnt = tfm_cnt;
min_jrpriv = jrpriv;
}
if (!min_tfm_cnt)
break;
}
if (min_jrpriv) {
atomic_inc(&min_jrpriv->tfm_count);
dev = min_jrpriv->dev;
}
spin_unlock(&driver_data.jr_alloc_lock);
return dev;
}
EXPORT_SYMBOL(caam_jr_alloc);
/**
* caam_jr_free() - Free the Job Ring
* @rdev - points to the dev that identifies the Job ring to
* be released.
**/
void caam_jr_free(struct device *rdev)
{
struct caam_drv_private_jr *jrpriv = dev_get_drvdata(rdev);
atomic_dec(&jrpriv->tfm_count);
}
EXPORT_SYMBOL(caam_jr_free);
/**
* caam_jr_enqueue() - Enqueue a job descriptor head. Returns 0 if OK,
* -EBUSY if the queue is full, -EIO if it cannot map the caller's
* descriptor.
* @dev: device of the job ring to be used. This device should have
* been assigned prior by caam_jr_register().
* @desc: points to a job descriptor that execute our request. All
* descriptors (and all referenced data) must be in a DMAable
* region, and all data references must be physical addresses
* accessible to CAAM (i.e. within a PAMU window granted
* to it).
* @cbk: pointer to a callback function to be invoked upon completion
* of this request. This has the form:
* callback(struct device *dev, u32 *desc, u32 stat, void *arg)
* where:
* @dev: contains the job ring device that processed this
* response.
* @desc: descriptor that initiated the request, same as
* "desc" being argued to caam_jr_enqueue().
* @status: untranslated status received from CAAM. See the
* reference manual for a detailed description of
* error meaning, or see the JRSTA definitions in the
* register header file
* @areq: optional pointer to an argument passed with the
* original request
* @areq: optional pointer to a user argument for use at callback
* time.
**/
int caam_jr_enqueue(struct device *dev, u32 *desc,
void (*cbk)(struct device *dev, u32 *desc,
u32 status, void *areq),
void *areq)
{
struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
struct caam_jrentry_info *head_entry;
int head, tail, desc_size;
dma_addr_t desc_dma;
desc_size = (*desc & HDR_JD_LENGTH_MASK) * sizeof(u32);
desc_dma = dma_map_single(dev, desc, desc_size, DMA_TO_DEVICE);
if (dma_mapping_error(dev, desc_dma)) {
dev_err(dev, "caam_jr_enqueue(): can't map jobdesc\n");
return -EIO;
}
spin_lock_bh(&jrp->inplock);
head = jrp->head;
tail = ACCESS_ONCE(jrp->tail);
if (!rd_reg32(&jrp->rregs->inpring_avail) ||
CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) {
spin_unlock_bh(&jrp->inplock);
dma_unmap_single(dev, desc_dma, desc_size, DMA_TO_DEVICE);
return -EBUSY;
}
head_entry = &jrp->entinfo[head];
head_entry->desc_addr_virt = desc;
head_entry->desc_size = desc_size;
head_entry->callbk = (void *)cbk;
head_entry->cbkarg = areq;
head_entry->desc_addr_dma = desc_dma;
jrp->inpring[jrp->inp_ring_write_index] = desc_dma;
smp_wmb();
jrp->inp_ring_write_index = (jrp->inp_ring_write_index + 1) &
(JOBR_DEPTH - 1);
jrp->head = (head + 1) & (JOBR_DEPTH - 1);
wr_reg32(&jrp->rregs->inpring_jobadd, 1);
spin_unlock_bh(&jrp->inplock);
return 0;
}
EXPORT_SYMBOL(caam_jr_enqueue);
/*
* Init JobR independent of platform property detection
*/
static int caam_jr_init(struct device *dev)
{
struct caam_drv_private_jr *jrp;
dma_addr_t inpbusaddr, outbusaddr;
int i, error;
jrp = dev_get_drvdata(dev);
tasklet_init(&jrp->irqtask, caam_jr_dequeue, (unsigned long)dev);
/* Connect job ring interrupt handler. */
error = request_irq(jrp->irq, caam_jr_interrupt, IRQF_SHARED,
dev_name(dev), dev);
if (error) {
dev_err(dev, "can't connect JobR %d interrupt (%d)\n",
jrp->ridx, jrp->irq);
irq_dispose_mapping(jrp->irq);
jrp->irq = 0;
return -EINVAL;
}
error = caam_reset_hw_jr(dev);
if (error)
return error;
jrp->inpring = dma_alloc_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
&inpbusaddr, GFP_KERNEL);
jrp->outring = dma_alloc_coherent(dev, sizeof(struct jr_outentry) *
JOBR_DEPTH, &outbusaddr, GFP_KERNEL);
jrp->entinfo = kzalloc(sizeof(struct caam_jrentry_info) * JOBR_DEPTH,
GFP_KERNEL);
if ((jrp->inpring == NULL) || (jrp->outring == NULL) ||
(jrp->entinfo == NULL)) {
dev_err(dev, "can't allocate job rings for %d\n",
jrp->ridx);
return -ENOMEM;
}
for (i = 0; i < JOBR_DEPTH; i++)
jrp->entinfo[i].desc_addr_dma = !0;
/* Setup rings */
jrp->inp_ring_write_index = 0;
jrp->out_ring_read_index = 0;
jrp->head = 0;
jrp->tail = 0;
wr_reg64(&jrp->rregs->inpring_base, inpbusaddr);
wr_reg64(&jrp->rregs->outring_base, outbusaddr);
wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH);
wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH);
jrp->ringsize = JOBR_DEPTH;
spin_lock_init(&jrp->inplock);
spin_lock_init(&jrp->outlock);
/* Select interrupt coalescing parameters */
setbits32(&jrp->rregs->rconfig_lo, JOBR_INTC |
(JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) |
(JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT));
return 0;
}
/*
* Probe routine for each detected JobR subsystem.
*/
static int caam_jr_probe(struct platform_device *pdev)
{
struct device *jrdev;
struct device_node *nprop;
struct caam_job_ring __iomem *ctrl;
struct caam_drv_private_jr *jrpriv;
static int total_jobrs;
int error;
jrdev = &pdev->dev;
jrpriv = kmalloc(sizeof(struct caam_drv_private_jr),
GFP_KERNEL);
if (!jrpriv)
return -ENOMEM;
dev_set_drvdata(jrdev, jrpriv);
/* save ring identity relative to detection */
jrpriv->ridx = total_jobrs++;
nprop = pdev->dev.of_node;
/* Get configuration properties from device tree */
/* First, get register page */
ctrl = of_iomap(nprop, 0);
if (!ctrl) {
dev_err(jrdev, "of_iomap() failed\n");
return -ENOMEM;
}
jrpriv->rregs = (struct caam_job_ring __force *)ctrl;
if (sizeof(dma_addr_t) == sizeof(u64))
if (of_device_is_compatible(nprop, "fsl,sec-v5.0-job-ring"))
dma_set_mask(jrdev, DMA_BIT_MASK(40));
else
dma_set_mask(jrdev, DMA_BIT_MASK(36));
else
dma_set_mask(jrdev, DMA_BIT_MASK(32));
/* Identify the interrupt */
jrpriv->irq = irq_of_parse_and_map(nprop, 0);
/* Now do the platform independent part */
error = caam_jr_init(jrdev); /* now turn on hardware */
if (error) {
kfree(jrpriv);
return error;
}
jrpriv->dev = jrdev;
spin_lock(&driver_data.jr_alloc_lock);
list_add_tail(&jrpriv->list_node, &driver_data.jr_list);
spin_unlock(&driver_data.jr_alloc_lock);
atomic_set(&jrpriv->tfm_count, 0);
return 0;
}
static struct of_device_id caam_jr_match[] = {
{
.compatible = "fsl,sec-v4.0-job-ring",
},
{
.compatible = "fsl,sec4.0-job-ring",
},
{},
};
MODULE_DEVICE_TABLE(of, caam_jr_match);
static struct platform_driver caam_jr_driver = {
.driver = {
.name = "caam_jr",
.owner = THIS_MODULE,
.of_match_table = caam_jr_match,
},
.probe = caam_jr_probe,
.remove = caam_jr_remove,
};
static int __init jr_driver_init(void)
{
spin_lock_init(&driver_data.jr_alloc_lock);
INIT_LIST_HEAD(&driver_data.jr_list);
return platform_driver_register(&caam_jr_driver);
}
static void __exit jr_driver_exit(void)
{
platform_driver_unregister(&caam_jr_driver);
}
module_init(jr_driver_init);
module_exit(jr_driver_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("FSL CAAM JR request backend");
MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");