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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 671c454368374b538fd0421d3da08ed59328099d / . / drivers / ufs / cdns-platform.c
blob: bad1bf7de5f0b4397547f493fa5f519543dff454 [file] [log] [blame]
Faiz Abbasef5fb5a2019-10-15 18:24:37 +0530[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
2/**
3 * cdns-platform.c - Platform driver for Cadence UFSHCI device
4 *
5 * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
6 */
7
8#include <clk.h>
9#include <common.h>
10#include <dm.h>
11#include <ufs.h>
Simon Glass98eb4ce2020-07-19 10:15:54 -0600[diff] [blame]12#include <asm/io.h>
Simon Glass336d4612020-02-03 07:36:16 -0700[diff] [blame]13#include <dm/device_compat.h>
Simon Glasscd93d622020-05-10 11:40:13 -0600[diff] [blame]14#include <linux/bitops.h>
Simon Glass61b29b82020-02-03 07:36:15 -0700[diff] [blame]15#include <linux/err.h>
Faiz Abbasef5fb5a2019-10-15 18:24:37 +0530[diff] [blame]16
17#include "ufs.h"
18
19#define USEC_PER_SEC 1000000L
20
21#define CDNS_UFS_REG_HCLKDIV 0xFC
22#define CDNS_UFS_REG_PHY_XCFGD1 0x113C
23
24static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
25 enum ufs_notify_change_status status)
26{
27 hba->quirks |= UFSHCD_QUIRK_BROKEN_LCC;
28 switch (status) {
29 case PRE_CHANGE:
30 return ufshcd_dme_set(hba,
31 UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
32 0);
33 case POST_CHANGE:
34 ;
35 }
36
37 return 0;
38}
39
40static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
41{
42 struct clk clk;
43 unsigned long core_clk_rate = 0;
44 u32 core_clk_div = 0;
45 int ret;
46
47 ret = clk_get_by_name(hba->dev, "core_clk", &clk);
48 if (ret) {
49 dev_err(hba->dev, "failed to get core_clk clock\n");
50 return ret;
51 }
52
53 core_clk_rate = clk_get_rate(&clk);
54 if (IS_ERR_VALUE(core_clk_rate)) {
55 dev_err(hba->dev, "%s: unable to find core_clk rate\n",
56 __func__);
57 return core_clk_rate;
58 }
59
60 core_clk_div = core_clk_rate / USEC_PER_SEC;
61 ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
62
63 return 0;
64}
65
66static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
67 enum ufs_notify_change_status status)
68{
69 switch (status) {
70 case PRE_CHANGE:
71 return cdns_ufs_set_hclkdiv(hba);
72 case POST_CHANGE:
73 ;
74 }
75
76 return 0;
77}
78
79static int cdns_ufs_init(struct ufs_hba *hba)
80{
81 u32 data;
82
83 /* Increase RX_Advanced_Min_ActivateTime_Capability */
84 data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
85 data |= BIT(24);
86 ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
87
88 return 0;
89}
90
91static struct ufs_hba_ops cdns_pltfm_hba_ops = {
92 .init = cdns_ufs_init,
93 .hce_enable_notify = cdns_ufs_hce_enable_notify,
94 .link_startup_notify = cdns_ufs_link_startup_notify,
95};
96
97static int cdns_ufs_pltfm_probe(struct udevice *dev)
98{
99 int err = ufshcd_probe(dev, &cdns_pltfm_hba_ops);
100 if (err)
101 dev_err(dev, "ufshcd_probe() failed %d\n", err);
102
103 return err;
104}
105
106static int cdns_ufs_pltfm_bind(struct udevice *dev)
107{
108 struct udevice *scsi_dev;
109
110 return ufs_scsi_bind(dev, &scsi_dev);
111}
112
113static const struct udevice_id cdns_ufs_pltfm_ids[] = {
114 {
115 .compatible = "cdns,ufshc-m31-16nm",
116 },
117 {},
118};
119
120U_BOOT_DRIVER(cdns_ufs_pltfm) = {
121 .name = "cdns-ufs-pltfm",
122 .id = UCLASS_UFS,
123 .of_match = cdns_ufs_pltfm_ids,
124 .probe = cdns_ufs_pltfm_probe,
125 .bind = cdns_ufs_pltfm_bind,
126};