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/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
  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
 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
 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);