drivers/ata/ahci_seattle.c

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