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ufs: Add Support for Cadence platform UFS driver

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Add Support for the platform driver for the Cadence device present on
TI's J721e device.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
This commit is contained in:
Faiz Abbas 2019-10-15 18:24:37 +05:30 • committed by Tom Rini
parent 7feafb0ae4
commit ef5fb5a84c
3 changed files with 131 additions and 0 deletions
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122
drivers/ufs/cdns-platform.c Normal file
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// SPDX-License-Identifier: GPL-2.0+
/**
* cdns-platform.c - Platform driver for Cadence UFSHCI device
*
* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
*/
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <ufs.h>
#include "ufs.h"
#define USEC_PER_SEC 1000000L
#define CDNS_UFS_REG_HCLKDIV 0xFC
#define CDNS_UFS_REG_PHY_XCFGD1 0x113C
static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
hba->quirks |= UFSHCD_QUIRK_BROKEN_LCC;
switch (status) {
case PRE_CHANGE:
return ufshcd_dme_set(hba,
UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
0);
case POST_CHANGE:
;
}
return 0;
}
static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
{
struct clk clk;
unsigned long core_clk_rate = 0;
u32 core_clk_div = 0;
int ret;
ret = clk_get_by_name(hba->dev, "core_clk", &clk);
if (ret) {
dev_err(hba->dev, "failed to get core_clk clock\n");
return ret;
}
core_clk_rate = clk_get_rate(&clk);
if (IS_ERR_VALUE(core_clk_rate)) {
dev_err(hba->dev, "%s: unable to find core_clk rate\n",
__func__);
return core_clk_rate;
}
core_clk_div = core_clk_rate / USEC_PER_SEC;
ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
return 0;
}
static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
switch (status) {
case PRE_CHANGE:
return cdns_ufs_set_hclkdiv(hba);
case POST_CHANGE:
;
}
return 0;
}
static int cdns_ufs_init(struct ufs_hba *hba)
{
u32 data;
/* Increase RX_Advanced_Min_ActivateTime_Capability */
data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
data |= BIT(24);
ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
return 0;
}
static struct ufs_hba_ops cdns_pltfm_hba_ops = {
.init = cdns_ufs_init,
.hce_enable_notify = cdns_ufs_hce_enable_notify,
.link_startup_notify = cdns_ufs_link_startup_notify,
};
static int cdns_ufs_pltfm_probe(struct udevice *dev)
{
int err = ufshcd_probe(dev, &cdns_pltfm_hba_ops);
if (err)
dev_err(dev, "ufshcd_probe() failed %d\n", err);
return err;
}
static int cdns_ufs_pltfm_bind(struct udevice *dev)
{
struct udevice *scsi_dev;
return ufs_scsi_bind(dev, &scsi_dev);
}
static const struct udevice_id cdns_ufs_pltfm_ids[] = {
{
.compatible = "cdns,ufshc-m31-16nm",
},
{},
};
U_BOOT_DRIVER(cdns_ufs_pltfm) = {
.name = "cdns-ufs-pltfm",
.id = UCLASS_UFS,
.of_match = cdns_ufs_pltfm_ids,
.probe = cdns_ufs_pltfm_probe,
.bind = cdns_ufs_pltfm_bind,
};