diff options
Diffstat (limited to 'drivers/firmware/imx/ele_mu.c')
| -rw-r--r-- | drivers/firmware/imx/ele_mu.c | 70 |
1 files changed, 66 insertions, 4 deletions
diff --git a/drivers/firmware/imx/ele_mu.c b/drivers/firmware/imx/ele_mu.c index 7b7d4c64407c..a99689f90334 100644 --- a/drivers/firmware/imx/ele_mu.c +++ b/drivers/firmware/imx/ele_mu.c @@ -19,6 +19,7 @@ #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/of_platform.h> +#include <linux/of_reserved_mem.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/delay.h> @@ -30,22 +31,27 @@ #define ELE_PING_INTERVAL (3600 * HZ) #define ELE_TRNG_STATE_OK 0x203 +#define RESERVED_DMA_POOL BIT(1) + struct ele_mu_priv *ele_priv_export; struct imx_info { bool socdev; /* platform specific flag to enable/disable the Sentinel True RNG */ bool enable_ele_trng; + bool reserved_dma_ranges; }; static const struct imx_info imx8ulp_info = { .socdev = true, .enable_ele_trng = false, + .reserved_dma_ranges = true, }; static const struct imx_info imx93_info = { .socdev = false, .enable_ele_trng = true, + .reserved_dma_ranges = true, }; static const struct of_device_id ele_mu_match[] = { @@ -231,7 +237,7 @@ static int imx_soc_device_register(struct platform_device *pdev) return 0; } -static int ele_trng_enable(struct platform_device *pdev) +static int ele_do_start_rng(void) { int ret; int count = 5; @@ -262,8 +268,9 @@ static int ele_trng_enable(struct platform_device *pdev) return -EIO; } - return ele_trng_init(&pdev->dev); + return 0; } + /* * File operations for user-space */ @@ -936,6 +943,9 @@ static int ele_mu_probe(struct platform_device *pdev) goto exit; } + priv->max_dev_ctx = max_nb_users; + priv->ctxs = devm_kzalloc(dev, sizeof(dev_ctx) * max_nb_users, GFP_KERNEL); + /* Create users */ for (i = 0; i < max_nb_users; i++) { dev_ctx = devm_kzalloc(dev, sizeof(*dev_ctx), GFP_KERNEL); @@ -949,6 +959,9 @@ static int ele_mu_probe(struct platform_device *pdev) dev_ctx->dev = dev; dev_ctx->status = MU_FREE; dev_ctx->priv = priv; + + priv->ctxs[i] = dev_ctx; + /* Default value invalid for an header. */ init_waitqueue_head(&dev_ctx->wq); @@ -990,6 +1003,16 @@ static int ele_mu_probe(struct platform_device *pdev) ele_priv_export = priv; + if (info && info->reserved_dma_ranges) { + ret = of_reserved_mem_device_init(dev); + if (ret) { + dev_err(dev, "failed to init reserved memory region %d\n", ret); + priv->flags &= (~RESERVED_DMA_POOL); + goto exit; + } + priv->flags |= RESERVED_DMA_POOL; + } + if (info && info->socdev) { ret = imx_soc_device_register(pdev); if (ret) { @@ -999,8 +1022,13 @@ static int ele_mu_probe(struct platform_device *pdev) } } - if (info && info->enable_ele_trng) { - ret = ele_trng_enable(pdev); + /* start ele rng */ + ret = ele_do_start_rng(); + if (ret) + dev_err(dev, "Failed to start ele rng\n"); + + if (!ret && info && info->enable_ele_trng) { + ret = ele_trng_init(dev); if (ret) dev_err(dev, "Failed to init ele-trng\n"); } @@ -1015,6 +1043,13 @@ static int ele_mu_probe(struct platform_device *pdev) return devm_of_platform_populate(dev); exit: + /* if execution control reaches here, ele-mu probe fail. + * hence doing the cleanup + */ + if (priv->flags & RESERVED_DMA_POOL) { + of_reserved_mem_device_release(dev); + priv->flags &= (~RESERVED_DMA_POOL); + } return ret; } @@ -1027,13 +1062,40 @@ static int ele_mu_remove(struct platform_device *pdev) mbox_free_channel(priv->tx_chan); mbox_free_channel(priv->rx_chan); + if (priv->flags & RESERVED_DMA_POOL) { + of_reserved_mem_device_release(&pdev->dev); + priv->flags &= (~RESERVED_DMA_POOL); + } + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int ele_mu_resume(struct device *dev) +{ + struct ele_mu_priv *priv = dev_get_drvdata(dev); + int i, ret; + + for (i = 0; i < priv->max_dev_ctx; i++) + wake_up_interruptible(&priv->ctxs[i]->wq); + + ret = ele_do_start_rng(); + if (ret) + dev_err(dev, "Failed to start ele rng on resume\n"); + return 0; } +#endif + +static const struct dev_pm_ops ele_mu_pm = { + SET_SYSTEM_SLEEP_PM_OPS(NULL, ele_mu_resume) +}; static struct platform_driver ele_mu_driver = { .driver = { .name = "fsl-ele-mu", .of_match_table = ele_mu_match, + .pm = &ele_mu_pm, }, .probe = ele_mu_probe, .remove = ele_mu_remove, |