diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 14:48:06 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 14:48:06 -0800 |
commit | 938edb8a31b976c9a92eb0cd4ff481e93f76c1f1 (patch) | |
tree | 0854d5f6859d51032f1d853eaa8ab0e8647fb0cb /drivers/scsi/ufs/cdns-pltfrm.c | |
parent | af7ddd8a627c62a835524b3f5b471edbbbcce025 (diff) | |
parent | da7903092b880b25971ca9103cb0b934a44ace2b (diff) |
Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI updates from James Bottomley:
"This is mostly update of the usual drivers: smarpqi, lpfc, qedi,
megaraid_sas, libsas, zfcp, mpt3sas, hisi_sas.
Additionally, we have a pile of annotation, unused variable and minor
updates.
The big API change is the updates for Christoph's DMA rework which
include removing the DISABLE_CLUSTERING flag.
And finally there are a couple of target tree updates"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (259 commits)
scsi: isci: request: mark expected switch fall-through
scsi: isci: remote_node_context: mark expected switch fall-throughs
scsi: isci: remote_device: Mark expected switch fall-throughs
scsi: isci: phy: Mark expected switch fall-through
scsi: iscsi: Capture iscsi debug messages using tracepoints
scsi: myrb: Mark expected switch fall-throughs
scsi: megaraid: fix out-of-bound array accesses
scsi: mpt3sas: mpt3sas_scsih: Mark expected switch fall-through
scsi: fcoe: remove set but not used variable 'port'
scsi: smartpqi: call pqi_free_interrupts() in pqi_shutdown()
scsi: smartpqi: fix build warnings
scsi: smartpqi: update driver version
scsi: smartpqi: add ofa support
scsi: smartpqi: increase fw status register read timeout
scsi: smartpqi: bump driver version
scsi: smartpqi: add smp_utils support
scsi: smartpqi: correct lun reset issues
scsi: smartpqi: correct volume status
scsi: smartpqi: do not offline disks for transient did no connect conditions
scsi: smartpqi: allow for larger raid maps
...
Diffstat (limited to 'drivers/scsi/ufs/cdns-pltfrm.c')
-rw-r--r-- | drivers/scsi/ufs/cdns-pltfrm.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c new file mode 100644 index 000000000000..4a37b4f57164 --- /dev/null +++ b/drivers/scsi/ufs/cdns-pltfrm.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Platform UFS Host driver for Cadence controller + * + * Copyright (C) 2018 Cadence Design Systems, Inc. + * + * Authors: + * Jan Kotas <jank@cadence.com> + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/time.h> + +#include "ufshcd-pltfrm.h" + +#define CDNS_UFS_REG_HCLKDIV 0xFC + +/** + * Sets HCLKDIV register value based on the core_clk + * @hba: host controller instance + * + * Return zero for success and non-zero for failure + */ +static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba) +{ + struct ufs_clk_info *clki; + struct list_head *head = &hba->clk_list_head; + unsigned long core_clk_rate = 0; + u32 core_clk_div = 0; + + if (list_empty(head)) + return 0; + + list_for_each_entry(clki, head, list) { + if (IS_ERR_OR_NULL(clki->clk)) + continue; + if (!strcmp(clki->name, "core_clk")) + core_clk_rate = clk_get_rate(clki->clk); + } + + if (!core_clk_rate) { + dev_err(hba->dev, "%s: unable to find core_clk rate\n", + __func__); + return -EINVAL; + } + + core_clk_div = core_clk_rate / USEC_PER_SEC; + + ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV); + /** + * Make sure the register was updated, + * UniPro layer will not work with an incorrect value. + */ + mb(); + + return 0; +} + +/** + * Sets clocks used by the controller + * @hba: host controller instance + * @on: if true, enable clocks, otherwise disable + * @status: notify stage (pre, post change) + * + * Return zero for success and non-zero for failure + */ +static int cdns_ufs_setup_clocks(struct ufs_hba *hba, bool on, + enum ufs_notify_change_status status) +{ + if ((!on) || (status == PRE_CHANGE)) + return 0; + + return cdns_ufs_set_hclkdiv(hba); +} + +static struct ufs_hba_variant_ops cdns_pltfm_hba_vops = { + .name = "cdns-ufs-pltfm", + .setup_clocks = cdns_ufs_setup_clocks, +}; + +/** + * cdns_ufs_pltfrm_probe - probe routine of the driver + * @pdev: pointer to platform device handle + * + * Return zero for success and non-zero for failure + */ +static int cdns_ufs_pltfrm_probe(struct platform_device *pdev) +{ + int err; + struct device *dev = &pdev->dev; + + /* Perform generic probe */ + err = ufshcd_pltfrm_init(pdev, &cdns_pltfm_hba_vops); + if (err) + dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err); + + return err; +} + +/** + * cdns_ufs_pltfrm_remove - removes the ufs driver + * @pdev: pointer to platform device handle + * + * Always returns 0 + */ +static int cdns_ufs_pltfrm_remove(struct platform_device *pdev) +{ + struct ufs_hba *hba = platform_get_drvdata(pdev); + + ufshcd_remove(hba); + return 0; +} + +static const struct of_device_id cdns_ufs_of_match[] = { + { .compatible = "cdns,ufshc" }, + {}, +}; + +MODULE_DEVICE_TABLE(of, cdns_ufs_of_match); + +static const struct dev_pm_ops cdns_ufs_dev_pm_ops = { + .suspend = ufshcd_pltfrm_suspend, + .resume = ufshcd_pltfrm_resume, + .runtime_suspend = ufshcd_pltfrm_runtime_suspend, + .runtime_resume = ufshcd_pltfrm_runtime_resume, + .runtime_idle = ufshcd_pltfrm_runtime_idle, +}; + +static struct platform_driver cdns_ufs_pltfrm_driver = { + .probe = cdns_ufs_pltfrm_probe, + .remove = cdns_ufs_pltfrm_remove, + .driver = { + .name = "cdns-ufshcd", + .pm = &cdns_ufs_dev_pm_ops, + .of_match_table = cdns_ufs_of_match, + }, +}; + +module_platform_driver(cdns_ufs_pltfrm_driver); + +MODULE_AUTHOR("Jan Kotas <jank@cadence.com>"); +MODULE_DESCRIPTION("Cadence UFS host controller platform driver"); +MODULE_LICENSE("GPL v2"); +MODULE_VERSION(UFSHCD_DRIVER_VERSION); |