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| author | Corentin LABBE <clabbe.montjoie@gmail.com> | 2016-08-26 13:11:35 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2016-08-31 23:00:46 +0800 |
| commit | 3c343a37644c5fe07960c3226a463d98627607f0 (patch) | |
| tree | 7b7d01b99031bf666a4e7c5be7eae2ef9df2bea6 | |
| parent | 7bad2cc062b343575f19d5de6be3f297a1429f37 (diff) | |
| download | linux-3c343a37644c5fe07960c3226a463d98627607f0.tar.gz linux-3c343a37644c5fe07960c3226a463d98627607f0.tar.bz2 linux-3c343a37644c5fe07960c3226a463d98627607f0.zip | |
hwrng: amd - Access hardware via ioread32/iowrite32
Instead of accessing hw directly via pmbase, it's better to
access after ioport_map() via ioread32/iowrite32.
Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | drivers/char/hw_random/amd-rng.c | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/drivers/char/hw_random/amd-rng.c b/drivers/char/hw_random/amd-rng.c index 4ef94e9b9fe7..bfa14b9a3a30 100644 --- a/drivers/char/hw_random/amd-rng.c +++ b/drivers/char/hw_random/amd-rng.c @@ -32,6 +32,11 @@ #define DRV_NAME "AMD768-HWRNG" +#define RNGDATA 0x00 +#define RNGDONE 0x04 +#define PMBASE_OFFSET 0xF0 +#define PMBASE_SIZE 8 + /* * Data for PCI driver interface * @@ -48,6 +53,7 @@ static const struct pci_device_id pci_tbl[] = { MODULE_DEVICE_TABLE(pci, pci_tbl); struct amd768_priv { + void __iomem *iobase; struct pci_dev *pcidev; u32 pmbase; }; @@ -58,7 +64,7 @@ static int amd_rng_data_present(struct hwrng *rng, int wait) int data, i; for (i = 0; i < 20; i++) { - data = !!(inl(priv->pmbase + 0xF4) & 1); + data = !!(ioread32(priv->iobase + RNGDONE) & 1); if (data || !wait) break; udelay(10); @@ -70,7 +76,7 @@ static int amd_rng_data_read(struct hwrng *rng, u32 *data) { struct amd768_priv *priv = (struct amd768_priv *)rng->priv; - *data = inl(priv->pmbase + 0xF0); + *data = ioread32(priv->iobase + RNGDATA); return 4; } @@ -138,12 +144,20 @@ found: if (!priv) return -ENOMEM; - if (!request_region(pmbase + 0xF0, 8, DRV_NAME)) { + if (!request_region(pmbase + PMBASE_OFFSET, PMBASE_SIZE, DRV_NAME)) { dev_err(&pdev->dev, DRV_NAME " region 0x%x already in use!\n", pmbase + 0xF0); err = -EBUSY; goto out; } + + priv->iobase = ioport_map(pmbase + PMBASE_OFFSET, PMBASE_SIZE); + if (!priv->iobase) { + pr_err(DRV_NAME "Cannot map ioport\n"); + err = -EINVAL; + goto err_iomap; + } + amd_rng.priv = (unsigned long)priv; priv->pmbase = pmbase; priv->pcidev = pdev; @@ -152,11 +166,14 @@ found: err = hwrng_register(&amd_rng); if (err) { pr_err(DRV_NAME " registering failed (%d)\n", err); - release_region(pmbase + 0xF0, 8); - goto out; + goto err_hwrng; } return 0; +err_hwrng: + ioport_unmap(priv->iobase); +err_iomap: + release_region(pmbase + PMBASE_OFFSET, PMBASE_SIZE); out: kfree(priv); return err; @@ -170,7 +187,9 @@ static void __exit mod_exit(void) hwrng_unregister(&amd_rng); - release_region(priv->pmbase + 0xF0, 8); + ioport_unmap(priv->iobase); + + release_region(priv->pmbase + PMBASE_OFFSET, PMBASE_SIZE); kfree(priv); } |