aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/sunxi/patches-3.13/162-2-ahci-plat-manage-sata-phy.patch
blob: 1ab704bedaa3f5103daf72e41a06f9d88a810da7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
From 154a670a945c54300749d5ba008f30bbd6089017 Mon Sep 17 00:00:00 2001
From: Roger Quadros <rogerq@ti.com>
Date: Mon, 27 Jan 2014 16:41:18 +0200
Subject: [PATCH] ata: ahci_platform: Manage SATA PHY

Some platforms have a PHY hooked up to the
SATA controller. The PHY needs to be initialized
and powered up for SATA to work. We do that
using the PHY framework.

CC: Balaji T K <balajitk@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/ata/ahci.h          |  2 ++
 drivers/ata/ahci_platform.c | 47 +++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index bf8100c..3ab7ac9 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -37,6 +37,7 @@
 
 #include <linux/clk.h>
 #include <linux/libata.h>
+#include <linux/phy/phy.h>
 #include <linux/regulator/consumer.h>
 
 /* Enclosure Management Control */
@@ -325,6 +326,7 @@ struct ahci_host_priv {
 	u32			em_msg_type;	/* EM message type */
 	struct clk		*clks[AHCI_MAX_CLKS]; /* Optional */
 	struct regulator	*target_pwr;	/* Optional */
+	struct phy		*phy;		/* If platform uses phy */
 	void			*plat_data;	/* Other platform data */
 	/*
 	 * Optional ahci_start_engine override, if not set this gets set to the
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index d7e55ba..99d38c1 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -23,6 +23,7 @@
 #include <linux/platform_device.h>
 #include <linux/libata.h>
 #include <linux/ahci_platform.h>
+#include <linux/phy/phy.h>
 #include "ahci.h"
 
 static void ahci_host_stop(struct ata_host *host);
@@ -147,6 +148,7 @@ void ahci_platform_disable_clks(struct ahci_host_priv *hpriv)
  *	the following order:
  *	1) Regulator
  *	2) Clocks (through ahci_platform_enable_clks)
+ *	3) Phy
  *
  *	If resource enabling fails at any point the previous enabled
  *	resources are disabled in reverse order.
@@ -171,8 +173,23 @@ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
 	if (rc)
 		goto disable_regulator;
 
+	if (hpriv->phy) {
+		rc = phy_init(hpriv->phy);
+		if (rc)
+			goto disable_clks;
+
+		rc = phy_power_on(hpriv->phy);
+		if (rc) {
+			phy_exit(hpriv->phy);
+			goto disable_clks;
+		}
+	}
+
 	return 0;
 
+disable_clks:
+	ahci_platform_disable_clks(hpriv);
+
 disable_regulator:
 	if (hpriv->target_pwr)
 		regulator_disable(hpriv->target_pwr);
@@ -186,14 +203,20 @@ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
  *
  *	This function disables all ahci_platform managed resources in
  *	the following order:
- *	1) Clocks (through ahci_platform_disable_clks)
- *	2) Regulator
+ *	1) Phy
+ *	2) Clocks (through ahci_platform_disable_clks)
+ *	3) Regulator
  *
  *	LOCKING:
  *	None.
  */
 void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
 {
+	if (hpriv->phy) {
+		phy_power_off(hpriv->phy);
+		phy_exit(hpriv->phy);
+	}
+
 	ahci_platform_disable_clks(hpriv);
 
 	if (hpriv->target_pwr)
@@ -222,6 +245,7 @@ static void ahci_platform_put_resources(struct device *dev, void *res)
  *	2) regulator for controlling the targets power (optional)
  *	3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node,
  *	   or for non devicetree enabled platforms a single clock
+ *	4) phy (optional)
  *
  *	LOCKING:
  *	None.
@@ -283,6 +307,25 @@ struct ahci_host_priv *ahci_platform_get_resources(
 		hpriv->clks[i] = clk;
 	}
 
+	hpriv->phy = devm_phy_get(dev, "sata-phy");
+	if (IS_ERR(hpriv->phy)) {
+		rc = PTR_ERR(hpriv->phy);
+		switch (rc) {
+		case -ENODEV:
+		case -ENOSYS:
+			/* continue normally */
+			hpriv->phy = NULL;
+			break;
+
+		case -EPROBE_DEFER:
+			goto err_out;
+
+		default:
+			dev_err(dev, "couldn't get sata-phy\n");
+			goto err_out;
+		}
+	}
+
 	devres_remove_group(dev, NULL);
 	return hpriv;
 
-- 
1.8.5.5