diff options
Diffstat (limited to 'drivers/scsi/ufs/ufshcd-dwc.c')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd-dwc.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufshcd-dwc.c b/drivers/scsi/ufs/ufshcd-dwc.c new file mode 100644 index 000000000..6a901da2d --- /dev/null +++ b/drivers/scsi/ufs/ufshcd-dwc.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * UFS Host driver for Synopsys Designware Core + * + * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com) + * + * Authors: Joao Pinto <jpinto@synopsys.com> + */ + +#include "ufshcd.h" +#include "unipro.h" + +#include "ufshcd-dwc.h" +#include "ufshci-dwc.h" + +int ufshcd_dwc_dme_set_attrs(struct ufs_hba *hba, + const struct ufshcd_dme_attr_val *v, int n) +{ + int ret = 0; + int attr_node = 0; + + for (attr_node = 0; attr_node < n; attr_node++) { + ret = ufshcd_dme_set_attr(hba, v[attr_node].attr_sel, + ATTR_SET_NOR, v[attr_node].mib_val, v[attr_node].peer); + + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL(ufshcd_dwc_dme_set_attrs); + +/** + * ufshcd_dwc_program_clk_div() + * This function programs the clk divider value. This value is needed to + * provide 1 microsecond tick to unipro layer. + * @hba: Private Structure pointer + * @divider_val: clock divider value to be programmed + * + */ +static void ufshcd_dwc_program_clk_div(struct ufs_hba *hba, u32 divider_val) +{ + ufshcd_writel(hba, divider_val, DWC_UFS_REG_HCLKDIV); +} + +/** + * ufshcd_dwc_link_is_up() + * Check if link is up + * @hba: private structure pointer + * + * Returns 0 on success, non-zero value on failure + */ +static int ufshcd_dwc_link_is_up(struct ufs_hba *hba) +{ + int dme_result = 0; + + ufshcd_dme_get(hba, UIC_ARG_MIB(VS_POWERSTATE), &dme_result); + + if (dme_result == UFSHCD_LINK_IS_UP) { + ufshcd_set_link_active(hba); + return 0; + } + + return 1; +} + +/** + * ufshcd_dwc_connection_setup() + * This function configures both the local side (host) and the peer side + * (device) unipro attributes to establish the connection to application/ + * cport. + * This function is not required if the hardware is properly configured to + * have this connection setup on reset. But invoking this function does no + * harm and should be fine even working with any ufs device. + * + * @hba: pointer to drivers private data + * + * Returns 0 on success non-zero value on failure + */ +static int ufshcd_dwc_connection_setup(struct ufs_hba *hba) +{ + static const struct ufshcd_dme_attr_val setup_attrs[] = { + { UIC_ARG_MIB(T_CONNECTIONSTATE), 0, DME_LOCAL }, + { UIC_ARG_MIB(N_DEVICEID), 0, DME_LOCAL }, + { UIC_ARG_MIB(N_DEVICEID_VALID), 0, DME_LOCAL }, + { UIC_ARG_MIB(T_PEERDEVICEID), 1, DME_LOCAL }, + { UIC_ARG_MIB(T_PEERCPORTID), 0, DME_LOCAL }, + { UIC_ARG_MIB(T_TRAFFICCLASS), 0, DME_LOCAL }, + { UIC_ARG_MIB(T_CPORTFLAGS), 0x6, DME_LOCAL }, + { UIC_ARG_MIB(T_CPORTMODE), 1, DME_LOCAL }, + { UIC_ARG_MIB(T_CONNECTIONSTATE), 1, DME_LOCAL }, + { UIC_ARG_MIB(T_CONNECTIONSTATE), 0, DME_PEER }, + { UIC_ARG_MIB(N_DEVICEID), 1, DME_PEER }, + { UIC_ARG_MIB(N_DEVICEID_VALID), 1, DME_PEER }, + { UIC_ARG_MIB(T_PEERDEVICEID), 1, DME_PEER }, + { UIC_ARG_MIB(T_PEERCPORTID), 0, DME_PEER }, + { UIC_ARG_MIB(T_TRAFFICCLASS), 0, DME_PEER }, + { UIC_ARG_MIB(T_CPORTFLAGS), 0x6, DME_PEER }, + { UIC_ARG_MIB(T_CPORTMODE), 1, DME_PEER }, + { UIC_ARG_MIB(T_CONNECTIONSTATE), 1, DME_PEER } + }; + + return ufshcd_dwc_dme_set_attrs(hba, setup_attrs, ARRAY_SIZE(setup_attrs)); +} + +/** + * ufshcd_dwc_link_startup_notify() + * UFS Host DWC specific link startup sequence + * @hba: private structure pointer + * @status: Callback notify status + * + * Returns 0 on success, non-zero value on failure + */ +int ufshcd_dwc_link_startup_notify(struct ufs_hba *hba, + enum ufs_notify_change_status status) +{ + int err = 0; + + if (status == PRE_CHANGE) { + ufshcd_dwc_program_clk_div(hba, DWC_UFS_REG_HCLKDIV_DIV_125); + + if (hba->vops->phy_initialization) { + err = hba->vops->phy_initialization(hba); + if (err) { + dev_err(hba->dev, "Phy setup failed (%d)\n", + err); + goto out; + } + } + } else { /* POST_CHANGE */ + err = ufshcd_dwc_link_is_up(hba); + if (err) { + dev_err(hba->dev, "Link is not up\n"); + goto out; + } + + err = ufshcd_dwc_connection_setup(hba); + if (err) + dev_err(hba->dev, "Connection setup failed (%d)\n", + err); + } + +out: + return err; +} +EXPORT_SYMBOL(ufshcd_dwc_link_startup_notify); + +MODULE_AUTHOR("Joao Pinto <Joao.Pinto@synopsys.com>"); +MODULE_DESCRIPTION("UFS Host driver for Synopsys Designware Core"); +MODULE_LICENSE("Dual BSD/GPL"); |