swh:1:snp:49cd9498d6cccc5e78252c27dcb645bcf7bf0c91
Tip revision: e0dccc3b76fb35bb257b4118367a883073d7390e authored by Linus Torvalds on 24 July 2022, 20:26:27 UTC
Linux 5.19-rc8
Linux 5.19-rc8
Tip revision: e0dccc3
jr.c
// SPDX-License-Identifier: GPL-2.0+
/*
* CAAM/SEC 4.x transport/backend driver
* JobR backend functionality
*
* Copyright 2008-2012 Freescale Semiconductor, Inc.
* Copyright 2019 NXP
*/
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include "compat.h"
#include "ctrl.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 DEFINE_MUTEX(algs_lock);
static unsigned int active_devs;
static void register_algs(struct caam_drv_private_jr *jrpriv,
struct device *dev)
{
mutex_lock(&algs_lock);
if (++active_devs != 1)
goto algs_unlock;
caam_algapi_init(dev);
caam_algapi_hash_init(dev);
caam_pkc_init(dev);
jrpriv->hwrng = !caam_rng_init(dev);
caam_prng_register(dev);
caam_qi_algapi_init(dev);
algs_unlock:
mutex_unlock(&algs_lock);
}
static void unregister_algs(void)
{
mutex_lock(&algs_lock);
if (--active_devs != 0)
goto algs_unlock;
caam_qi_algapi_exit();
caam_prng_unregister(NULL);
caam_pkc_exit();
caam_algapi_hash_exit();
caam_algapi_exit();
algs_unlock:
mutex_unlock(&algs_lock);
}
static void caam_jr_crypto_engine_exit(void *data)
{
struct device *jrdev = data;
struct caam_drv_private_jr *jrpriv = dev_get_drvdata(jrdev);
/* Free the resources of crypto-engine */
crypto_engine_exit(jrpriv->engine);
}
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
*/
clrsetbits_32(&jrp->rregs->rconfig_lo, 0, 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 */
clrsetbits_32(&jrp->rregs->rconfig_lo, JRCFG_IMSK, 0);
return 0;
}
/*
* Shutdown JobR independent of platform property code
*/
static int caam_jr_shutdown(struct device *dev)
{
struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
int ret;
ret = caam_reset_hw_jr(dev);
tasklet_kill(&jrp->irqtask);
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);
if (jrpriv->hwrng)
caam_rng_exit(jrdev->parent);
/*
* Return EBUSY if job ring already allocated.
*/
if (atomic_read(&jrpriv->tfm_count)) {
dev_err(jrdev, "Device is busy\n");
return -EBUSY;
}
/* Unregister JR-based RNG & crypto algorithms */
unregister_algs();
/* 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");
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 */
clrsetbits_32(&jrp->rregs->rconfig_lo, 0, 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;
u32 outring_used = 0;
while (outring_used ||
(outring_used = rd_reg32(&jrp->rregs->outring_used))) {
head = READ_ONCE(jrp->head);
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);
if (jr_outentry_desc(jrp->outring, hw_idx) ==
caam_dma_to_cpu(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,
caam_dma_to_cpu(jr_outentry_desc(jrp->outring,
hw_idx)),
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 */
usercall = jrp->entinfo[sw_idx].callbk;
userarg = jrp->entinfo[sw_idx].cbkarg;
userdesc = jrp->entinfo[sw_idx].desc_addr_virt;
userstatus = caam32_to_cpu(jr_outentry_jrstatus(jrp->outring,
hw_idx));
/*
* Make sure all information from the job has been obtained
* before telling CAAM that the job has been removed from the
* output ring.
*/
mb();
/* 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);
} while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 &&
jrp->entinfo[tail].desc_addr_dma == 0);
jrp->tail = tail;
}
/* Finally, execute user's callback */
usercall(dev, userdesc, userstatus, userarg);
outring_used--;
}
/* reenable / unmask IRQs */
clrsetbits_32(&jrp->rregs->rconfig_lo, JRCFG_IMSK, 0);
}
/**
* 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 = ERR_PTR(-ENODEV);
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 -EINPROGRESS
* if OK, -ENOSPC if the queue is full, -EIO if it cannot map the caller's
* descriptor.
* @dev: struct device of the job ring to be used
* @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 = (caam32_to_cpu(*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 = READ_ONCE(jrp->tail);
if (!jrp->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 -ENOSPC;
}
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;
jr_inpentry_set(jrp->inpring, head, cpu_to_caam_dma(desc_dma));
/*
* Guarantee that the descriptor's DMA address has been written to
* the next slot in the ring before the write index is updated, since
* other cores may update this index independently.
*/
smp_wmb();
jrp->head = (head + 1) & (JOBR_DEPTH - 1);
/*
* Ensure that all job information has been written before
* notifying CAAM that a new job was added to the input ring
* using a memory barrier. The wr_reg32() uses api iowrite32()
* to do the register write. iowrite32() issues a memory barrier
* before the write operation.
*/
wr_reg32(&jrp->rregs->inpring_jobadd, 1);
jrp->inpring_avail--;
if (!jrp->inpring_avail)
jrp->inpring_avail = rd_reg32(&jrp->rregs->inpring_avail);
spin_unlock_bh(&jrp->inplock);
return -EINPROGRESS;
}
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);
error = caam_reset_hw_jr(dev);
if (error)
return error;
jrp->inpring = dmam_alloc_coherent(dev, SIZEOF_JR_INPENTRY *
JOBR_DEPTH, &inpbusaddr,
GFP_KERNEL);
if (!jrp->inpring)
return -ENOMEM;
jrp->outring = dmam_alloc_coherent(dev, SIZEOF_JR_OUTENTRY *
JOBR_DEPTH, &outbusaddr,
GFP_KERNEL);
if (!jrp->outring)
return -ENOMEM;
jrp->entinfo = devm_kcalloc(dev, JOBR_DEPTH, sizeof(*jrp->entinfo),
GFP_KERNEL);
if (!jrp->entinfo)
return -ENOMEM;
for (i = 0; i < JOBR_DEPTH; i++)
jrp->entinfo[i].desc_addr_dma = !0;
/* Setup rings */
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->inpring_avail = JOBR_DEPTH;
spin_lock_init(&jrp->inplock);
/* Select interrupt coalescing parameters */
clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JOBR_INTC |
(JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) |
(JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT));
tasklet_init(&jrp->irqtask, caam_jr_dequeue, (unsigned long)dev);
/* Connect job ring interrupt handler. */
error = devm_request_irq(dev, 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);
tasklet_kill(&jrp->irqtask);
}
return error;
}
static void caam_jr_irq_dispose_mapping(void *data)
{
irq_dispose_mapping((unsigned long)data);
}
/*
* 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;
struct resource *r;
int error;
jrdev = &pdev->dev;
jrpriv = devm_kzalloc(jrdev, sizeof(*jrpriv), 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 */
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
dev_err(jrdev, "platform_get_resource() failed\n");
return -ENOMEM;
}
ctrl = devm_ioremap(jrdev, r->start, resource_size(r));
if (!ctrl) {
dev_err(jrdev, "devm_ioremap() failed\n");
return -ENOMEM;
}
jrpriv->rregs = (struct caam_job_ring __iomem __force *)ctrl;
error = dma_set_mask_and_coherent(jrdev, caam_get_dma_mask(jrdev));
if (error) {
dev_err(jrdev, "dma_set_mask_and_coherent failed (%d)\n",
error);
return error;
}
/* Initialize crypto engine */
jrpriv->engine = crypto_engine_alloc_init_and_set(jrdev, true, NULL,
false,
CRYPTO_ENGINE_MAX_QLEN);
if (!jrpriv->engine) {
dev_err(jrdev, "Could not init crypto-engine\n");
return -ENOMEM;
}
error = devm_add_action_or_reset(jrdev, caam_jr_crypto_engine_exit,
jrdev);
if (error)
return error;
/* Start crypto engine */
error = crypto_engine_start(jrpriv->engine);
if (error) {
dev_err(jrdev, "Could not start crypto-engine\n");
return error;
}
/* Identify the interrupt */
jrpriv->irq = irq_of_parse_and_map(nprop, 0);
if (!jrpriv->irq) {
dev_err(jrdev, "irq_of_parse_and_map failed\n");
return -EINVAL;
}
error = devm_add_action_or_reset(jrdev, caam_jr_irq_dispose_mapping,
(void *)(unsigned long)jrpriv->irq);
if (error)
return error;
/* Now do the platform independent part */
error = caam_jr_init(jrdev); /* now turn on hardware */
if (error)
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);
register_algs(jrpriv, jrdev->parent);
return 0;
}
static const 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",
.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");