xref: /openbmc/linux/drivers/ata/ahci_seattle.c (revision 04fd6f56)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * AMD Seattle AHCI SATA driver
4  *
5  * Copyright (c) 2015, Advanced Micro Devices
6  * Author: Brijesh Singh <brijesh.singh@amd.com>
7  *
8  * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
9  */
10 
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/pm.h>
14 #include <linux/device.h>
15 #include <linux/platform_device.h>
16 #include <linux/libata.h>
17 #include <linux/ahci_platform.h>
18 #include <linux/acpi.h>
19 #include <linux/pci_ids.h>
20 #include "ahci.h"
21 
22 /* SGPIO Control Register definition
23  *
24  * Bit		Type		Description
25  * 31		RW		OD7.2 (activity)
26  * 30		RW		OD7.1 (locate)
27  * 29		RW		OD7.0 (fault)
28  * 28...8	RW		OD6.2...OD0.0 (3bits per port, 1 bit per LED)
29  * 7		RO		SGPIO feature flag
30  * 6:4		RO		Reserved
31  * 3:0		RO		Number of ports (0 means no port supported)
32  */
33 #define ACTIVITY_BIT_POS(x)		(8 + (3 * x))
34 #define LOCATE_BIT_POS(x)		(ACTIVITY_BIT_POS(x) + 1)
35 #define FAULT_BIT_POS(x)		(LOCATE_BIT_POS(x) + 1)
36 
37 #define ACTIVITY_MASK			0x00010000
38 #define LOCATE_MASK			0x00080000
39 #define FAULT_MASK			0x00400000
40 
41 #define DRV_NAME "ahci-seattle"
42 
43 static ssize_t seattle_transmit_led_message(struct ata_port *ap, u32 state,
44 					    ssize_t size);
45 
46 struct seattle_plat_data {
47 	void __iomem *sgpio_ctrl;
48 };
49 
50 static struct ata_port_operations ahci_port_ops = {
51 	.inherits		= &ahci_ops,
52 };
53 
54 static const struct ata_port_info ahci_port_info = {
55 	.flags		= AHCI_FLAG_COMMON,
56 	.pio_mask	= ATA_PIO4,
57 	.udma_mask	= ATA_UDMA6,
58 	.port_ops	= &ahci_port_ops,
59 };
60 
61 static struct ata_port_operations ahci_seattle_ops = {
62 	.inherits		= &ahci_ops,
63 	.transmit_led_message   = seattle_transmit_led_message,
64 };
65 
66 static const struct ata_port_info ahci_port_seattle_info = {
67 	.flags		= AHCI_FLAG_COMMON | ATA_FLAG_EM | ATA_FLAG_SW_ACTIVITY,
68 	.link_flags	= ATA_LFLAG_SW_ACTIVITY,
69 	.pio_mask	= ATA_PIO4,
70 	.udma_mask	= ATA_UDMA6,
71 	.port_ops	= &ahci_seattle_ops,
72 };
73 
74 static const struct scsi_host_template ahci_platform_sht = {
75 	AHCI_SHT(DRV_NAME),
76 };
77 
seattle_transmit_led_message(struct ata_port * ap,u32 state,ssize_t size)78 static ssize_t seattle_transmit_led_message(struct ata_port *ap, u32 state,
79 					    ssize_t size)
80 {
81 	struct ahci_host_priv *hpriv = ap->host->private_data;
82 	struct ahci_port_priv *pp = ap->private_data;
83 	struct seattle_plat_data *plat_data = hpriv->plat_data;
84 	unsigned long flags;
85 	int pmp;
86 	struct ahci_em_priv *emp;
87 	u32 val;
88 
89 	/* get the slot number from the message */
90 	pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
91 	if (pmp >= EM_MAX_SLOTS)
92 		return -EINVAL;
93 	emp = &pp->em_priv[pmp];
94 
95 	val = ioread32(plat_data->sgpio_ctrl);
96 	if (state & ACTIVITY_MASK)
97 		val |= 1 << ACTIVITY_BIT_POS((ap->port_no));
98 	else
99 		val &= ~(1 << ACTIVITY_BIT_POS((ap->port_no)));
100 
101 	if (state & LOCATE_MASK)
102 		val |= 1 << LOCATE_BIT_POS((ap->port_no));
103 	else
104 		val &= ~(1 << LOCATE_BIT_POS((ap->port_no)));
105 
106 	if (state & FAULT_MASK)
107 		val |= 1 << FAULT_BIT_POS((ap->port_no));
108 	else
109 		val &= ~(1 << FAULT_BIT_POS((ap->port_no)));
110 
111 	iowrite32(val, plat_data->sgpio_ctrl);
112 
113 	spin_lock_irqsave(ap->lock, flags);
114 
115 	/* save off new led state for port/slot */
116 	emp->led_state = state;
117 
118 	spin_unlock_irqrestore(ap->lock, flags);
119 
120 	return size;
121 }
122 
ahci_seattle_get_port_info(struct platform_device * pdev,struct ahci_host_priv * hpriv)123 static const struct ata_port_info *ahci_seattle_get_port_info(
124 		struct platform_device *pdev, struct ahci_host_priv *hpriv)
125 {
126 	struct device *dev = &pdev->dev;
127 	struct seattle_plat_data *plat_data;
128 	u32 val;
129 
130 	plat_data = devm_kzalloc(dev, sizeof(*plat_data), GFP_KERNEL);
131 	if (!plat_data)
132 		return &ahci_port_info;
133 
134 	plat_data->sgpio_ctrl = devm_platform_ioremap_resource(pdev, 1);
135 	if (IS_ERR(plat_data->sgpio_ctrl))
136 		return &ahci_port_info;
137 
138 	val = ioread32(plat_data->sgpio_ctrl);
139 
140 	if (!(val & 0xf))
141 		return &ahci_port_info;
142 
143 	hpriv->em_loc = 0;
144 	hpriv->em_buf_sz = 4;
145 	hpriv->em_msg_type = EM_MSG_TYPE_LED;
146 	hpriv->plat_data = plat_data;
147 
148 	dev_info(dev, "SGPIO LED control is enabled.\n");
149 	return &ahci_port_seattle_info;
150 }
151 
ahci_seattle_probe(struct platform_device * pdev)152 static int ahci_seattle_probe(struct platform_device *pdev)
153 {
154 	int rc;
155 	struct ahci_host_priv *hpriv;
156 
157 	hpriv = ahci_platform_get_resources(pdev, 0);
158 	if (IS_ERR(hpriv))
159 		return PTR_ERR(hpriv);
160 
161 	rc = ahci_platform_enable_resources(hpriv);
162 	if (rc)
163 		return rc;
164 
165 	rc = ahci_platform_init_host(pdev, hpriv,
166 				     ahci_seattle_get_port_info(pdev, hpriv),
167 				     &ahci_platform_sht);
168 	if (rc)
169 		goto disable_resources;
170 
171 	return 0;
172 disable_resources:
173 	ahci_platform_disable_resources(hpriv);
174 	return rc;
175 }
176 
177 static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
178 			 ahci_platform_resume);
179 
180 static const struct acpi_device_id ahci_acpi_match[] = {
181 	{ "AMDI0600", 0 },
182 	{}
183 };
184 MODULE_DEVICE_TABLE(acpi, ahci_acpi_match);
185 
186 static struct platform_driver ahci_seattle_driver = {
187 	.probe = ahci_seattle_probe,
188 	.remove_new = ata_platform_remove_one,
189 	.driver = {
190 		.name = DRV_NAME,
191 		.acpi_match_table = ahci_acpi_match,
192 		.pm = &ahci_pm_ops,
193 	},
194 };
195 module_platform_driver(ahci_seattle_driver);
196 
197 MODULE_DESCRIPTION("Seattle AHCI SATA platform driver");
198 MODULE_AUTHOR("Brijesh Singh <brijesh.singh@amd.com>");
199 MODULE_LICENSE("GPL");
200 MODULE_ALIAS("platform:" DRV_NAME);
201