drivers/ata/sata_highbank.c

   1 /*
   2  * Calxeda Highbank AHCI SATA platform driver
   3  * Copyright 2012 Calxeda, Inc.
   4  *
   5  * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2, as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include <linux/kernel.h>
  20 #include <linux/gfp.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/types.h>
  24 #include <linux/err.h>
  25 #include <linux/io.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/device.h>
  28 #include <linux/of_device.h>
  29 #include <linux/of_address.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/libata.h>
  32 #include <linux/ahci_platform.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/delay.h>
  35 #include <linux/export.h>
  36 #include "ahci.h"
  37
  38 #define CPHY_MAP(dev, addr) ((((dev) & 0x1f) << 7) | (((addr) >> 9) & 0x7f))
  39 #define CPHY_ADDR(addr) (((addr) & 0x1ff) << 2)
  40 #define SERDES_CR_CTL                   0x80a0
  41 #define SERDES_CR_ADDR                  0x80a1
  42 #define SERDES_CR_DATA                  0x80a2
  43 #define CR_BUSY                         0x0001
  44 #define CR_START                        0x0001
  45 #define CR_WR_RDN                       0x0002
  46 #define CPHY_RX_INPUT_STS               0x2002
  47 #define CPHY_SATA_OVERRIDE              0x4000
  48 #define CPHY_OVERRIDE                   0x2005
  49 #define SPHY_LANE                       0x100
  50 #define SPHY_HALF_RATE                  0x0001
  51 #define CPHY_SATA_DPLL_MODE             0x0700
  52 #define CPHY_SATA_DPLL_SHIFT            8
  53 #define CPHY_SATA_DPLL_RESET            (1 << 11)
  54 #define CPHY_PHY_COUNT                  6
  55 #define CPHY_LANE_COUNT                 4
  56 #define CPHY_PORT_COUNT                 (CPHY_PHY_COUNT * CPHY_LANE_COUNT)
  57
  58 static DEFINE_SPINLOCK(cphy_lock);
  59 /* Each of the 6 phys can have up to 4 sata ports attached to i. Map 0-based
  60  * sata ports to their phys and then to their lanes within the phys
  61  */
  62 struct phy_lane_info {
  63         void __iomem *phy_base;
  64         u8 lane_mapping;
  65         u8 phy_devs;
  66 };
  67 static struct phy_lane_info port_data[CPHY_PORT_COUNT];
  68
  69 static u32 __combo_phy_reg_read(u8 sata_port, u32 addr)
  70 {
  71         u32 data;
  72         u8 dev = port_data[sata_port].phy_devs;
  73         spin_lock(&cphy_lock);
  74         writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800);
  75         data = readl(port_data[sata_port].phy_base + CPHY_ADDR(addr));
  76         spin_unlock(&cphy_lock);
  77         return data;
  78 }
  79
  80 static void __combo_phy_reg_write(u8 sata_port, u32 addr, u32 data)
  81 {
  82         u8 dev = port_data[sata_port].phy_devs;
  83         spin_lock(&cphy_lock);
  84         writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800);
  85         writel(data, port_data[sata_port].phy_base + CPHY_ADDR(addr));
  86         spin_unlock(&cphy_lock);
  87 }
  88
  89 static void combo_phy_wait_for_ready(u8 sata_port)
  90 {
  91         while (__combo_phy_reg_read(sata_port, SERDES_CR_CTL) & CR_BUSY)
  92                 udelay(5);
  93 }
  94
  95 static u32 combo_phy_read(u8 sata_port, u32 addr)
  96 {
  97         combo_phy_wait_for_ready(sata_port);
  98         __combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr);
  99         __combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_START);
 100         combo_phy_wait_for_ready(sata_port);
 101         return __combo_phy_reg_read(sata_port, SERDES_CR_DATA);
 102 }
 103
 104 static void combo_phy_write(u8 sata_port, u32 addr, u32 data)
 105 {
 106         combo_phy_wait_for_ready(sata_port);
 107         __combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr);
 108         __combo_phy_reg_write(sata_port, SERDES_CR_DATA, data);
 109         __combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_WR_RDN | CR_START);
 110 }
 111
 112 static void highbank_cphy_disable_overrides(u8 sata_port)
 113 {
 114         u8 lane = port_data[sata_port].lane_mapping;
 115         u32 tmp;
 116         if (unlikely(port_data[sata_port].phy_base == NULL))
 117                 return;
 118         tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
 119         tmp &= ~CPHY_SATA_OVERRIDE;
 120         combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
 121 }
 122
 123 static void cphy_override_rx_mode(u8 sata_port, u32 val)
 124 {
 125         u8 lane = port_data[sata_port].lane_mapping;
 126         u32 tmp;
 127         tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
 128         tmp &= ~CPHY_SATA_OVERRIDE;
 129         combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
 130
 131         tmp |= CPHY_SATA_OVERRIDE;
 132         combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
 133
 134         tmp &= ~CPHY_SATA_DPLL_MODE;
 135         tmp |= val << CPHY_SATA_DPLL_SHIFT;
 136         combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
 137
 138         tmp |= CPHY_SATA_DPLL_RESET;
 139         combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
 140
 141         tmp &= ~CPHY_SATA_DPLL_RESET;
 142         combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
 143
 144         msleep(15);
 145 }
 146
 147 static void highbank_cphy_override_lane(u8 sata_port)
 148 {
 149         u8 lane = port_data[sata_port].lane_mapping;
 150         u32 tmp, k = 0;
 151
 152         if (unlikely(port_data[sata_port].phy_base == NULL))
 153                 return;
 154         do {
 155                 tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS +
 156                                                 lane * SPHY_LANE);
 157         } while ((tmp & SPHY_HALF_RATE) && (k++ < 1000));
 158         cphy_override_rx_mode(sata_port, 3);
 159 }
 160
 161 static int highbank_initialize_phys(struct device *dev, void __iomem *addr)
 162 {
 163         struct device_node *sata_node = dev->of_node;
 164         int phy_count = 0, phy, port = 0;
 165         void __iomem *cphy_base[CPHY_PHY_COUNT];
 166         struct device_node *phy_nodes[CPHY_PHY_COUNT];
 167         memset(port_data, 0, sizeof(struct phy_lane_info) * CPHY_PORT_COUNT);
 168         memset(phy_nodes, 0, sizeof(struct device_node*) * CPHY_PHY_COUNT);
 169
 170         do {
 171                 u32 tmp;
 172                 struct of_phandle_args phy_data;
 173                 if (of_parse_phandle_with_args(sata_node,
 174                                 "calxeda,port-phys", "#phy-cells",
 175                                 port, &phy_data))
 176                         break;
 177                 for (phy = 0; phy < phy_count; phy++) {
 178                         if (phy_nodes[phy] == phy_data.np)
 179                                 break;
 180                 }
 181                 if (phy_nodes[phy] == NULL) {
 182                         phy_nodes[phy] = phy_data.np;
 183                         cphy_base[phy] = of_iomap(phy_nodes[phy], 0);
 184                         if (cphy_base[phy] == NULL) {
 185                                 return 0;
 186                         }
 187                         phy_count += 1;
 188                 }
 189                 port_data[port].lane_mapping = phy_data.args[0];
 190                 of_property_read_u32(phy_nodes[phy], "phydev", &tmp);
 191                 port_data[port].phy_devs = tmp;
 192                 port_data[port].phy_base = cphy_base[phy];
 193                 of_node_put(phy_data.np);
 194                 port += 1;
 195         } while (port < CPHY_PORT_COUNT);
 196         return 0;
 197 }
 198
 199 static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
 200                                 unsigned long deadline)
 201 {
 202         const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
 203         struct ata_port *ap = link->ap;
 204         struct ahci_port_priv *pp = ap->private_data;
 205         u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
 206         struct ata_taskfile tf;
 207         bool online;
 208         u32 sstatus;
 209         int rc;
 210         int retry = 10;
 211
 212         ahci_stop_engine(ap);
 213
 214         /* clear D2H reception area to properly wait for D2H FIS */
 215         ata_tf_init(link->device, &tf);
 216         tf.command = ATA_BUSY;
 217         ata_tf_to_fis(&tf, 0, 0, d2h_fis);
 218
 219         do {
 220                 highbank_cphy_disable_overrides(link->ap->port_no);
 221                 rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
 222                 highbank_cphy_override_lane(link->ap->port_no);
 223
 224                 /* If the status is 1, we are connected, but the link did not
 225                  * come up. So retry resetting the link again.
 226                  */
 227                 if (sata_scr_read(link, SCR_STATUS, &sstatus))
 228                         break;
 229                 if (!(sstatus & 0x3))
 230                         break;
 231         } while (!online && retry--);
 232
 233         ahci_start_engine(ap);
 234
 235         if (online)
 236                 *class = ahci_dev_classify(ap);
 237
 238         return rc;
 239 }
 240
 241 static struct ata_port_operations ahci_highbank_ops = {
 242         .inherits               = &ahci_ops,
 243         .hardreset              = ahci_highbank_hardreset,
 244 };
 245
 246 static const struct ata_port_info ahci_highbank_port_info = {
 247         .flags          = AHCI_FLAG_COMMON,
 248         .pio_mask       = ATA_PIO4,
 249         .udma_mask      = ATA_UDMA6,
 250         .port_ops       = &ahci_highbank_ops,
 251 };
 252
 253 static struct scsi_host_template ahci_highbank_platform_sht = {
 254         AHCI_SHT("highbank-ahci"),
 255 };
 256
 257 static const struct of_device_id ahci_of_match[] = {
 258         { .compatible = "calxeda,hb-ahci" },
 259         {},
 260 };
 261 MODULE_DEVICE_TABLE(of, ahci_of_match);
 262
 263 static int ahci_highbank_probe(struct platform_device *pdev)
 264 {
 265         struct device *dev = &pdev->dev;
 266         struct ahci_host_priv *hpriv;
 267         struct ata_host *host;
 268         struct resource *mem;
 269         int irq;
 270         int n_ports;
 271         int i;
 272         int rc;
 273         struct ata_port_info pi = ahci_highbank_port_info;
 274         const struct ata_port_info *ppi[] = { &pi, NULL };
 275
 276         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 277         if (!mem) {
 278                 dev_err(dev, "no mmio space\n");
 279                 return -EINVAL;
 280         }
 281
 282         irq = platform_get_irq(pdev, 0);
 283         if (irq <= 0) {
 284                 dev_err(dev, "no irq\n");
 285                 return -EINVAL;
 286         }
 287
 288         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
 289         if (!hpriv) {
 290                 dev_err(dev, "can't alloc ahci_host_priv\n");
 291                 return -ENOMEM;
 292         }
 293
 294         hpriv->flags |= (unsigned long)pi.private_data;
 295
 296         hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
 297         if (!hpriv->mmio) {
 298                 dev_err(dev, "can't map %pR\n", mem);
 299                 return -ENOMEM;
 300         }
 301
 302         rc = highbank_initialize_phys(dev, hpriv->mmio);
 303         if (rc)
 304                 return rc;
 305
 306
 307         ahci_save_initial_config(dev, hpriv, 0, 0);
 308
 309         /* prepare host */
 310         if (hpriv->cap & HOST_CAP_NCQ)
 311                 pi.flags |= ATA_FLAG_NCQ;
 312
 313         if (hpriv->cap & HOST_CAP_PMP)
 314                 pi.flags |= ATA_FLAG_PMP;
 315
 316         ahci_set_em_messages(hpriv, &pi);
 317
 318         /* CAP.NP sometimes indicate the index of the last enabled
 319          * port, at other times, that of the last possible port, so
 320          * determining the maximum port number requires looking at
 321          * both CAP.NP and port_map.
 322          */
 323         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 324
 325         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 326         if (!host) {
 327                 rc = -ENOMEM;
 328                 goto err0;
 329         }
 330
 331         host->private_data = hpriv;
 332
 333         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 334                 host->flags |= ATA_HOST_PARALLEL_SCAN;
 335
 336         if (pi.flags & ATA_FLAG_EM)
 337                 ahci_reset_em(host);
 338
 339         for (i = 0; i < host->n_ports; i++) {
 340                 struct ata_port *ap = host->ports[i];
 341
 342                 ata_port_desc(ap, "mmio %pR", mem);
 343                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
 344
 345                 /* set enclosure management message type */
 346                 if (ap->flags & ATA_FLAG_EM)
 347                         ap->em_message_type = hpriv->em_msg_type;
 348
 349                 /* disabled/not-implemented port */
 350                 if (!(hpriv->port_map & (1 << i)))
 351                         ap->ops = &ata_dummy_port_ops;
 352         }
 353
 354         rc = ahci_reset_controller(host);
 355         if (rc)
 356                 goto err0;
 357
 358         ahci_init_controller(host);
 359         ahci_print_info(host, "platform");
 360
 361         rc = ata_host_activate(host, irq, ahci_interrupt, 0,
 362                                         &ahci_highbank_platform_sht);
 363         if (rc)
 364                 goto err0;
 365
 366         return 0;
 367 err0:
 368         return rc;
 369 }
 370
 371 #ifdef CONFIG_PM_SLEEP
 372 static int ahci_highbank_suspend(struct device *dev)
 373 {
 374         struct ata_host *host = dev_get_drvdata(dev);
 375         struct ahci_host_priv *hpriv = host->private_data;
 376         void __iomem *mmio = hpriv->mmio;
 377         u32 ctl;
 378         int rc;
 379
 380         if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
 381                 dev_err(dev, "firmware update required for suspend/resume\n");
 382                 return -EIO;
 383         }
 384
 385         /*
 386          * AHCI spec rev1.1 section 8.3.3:
 387          * Software must disable interrupts prior to requesting a
 388          * transition of the HBA to D3 state.
 389          */
 390         ctl = readl(mmio + HOST_CTL);
 391         ctl &= ~HOST_IRQ_EN;
 392         writel(ctl, mmio + HOST_CTL);
 393         readl(mmio + HOST_CTL); /* flush */
 394
 395         rc = ata_host_suspend(host, PMSG_SUSPEND);
 396         if (rc)
 397                 return rc;
 398
 399         return 0;
 400 }
 401
 402 static int ahci_highbank_resume(struct device *dev)
 403 {
 404         struct ata_host *host = dev_get_drvdata(dev);
 405         int rc;
 406
 407         if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
 408                 rc = ahci_reset_controller(host);
 409                 if (rc)
 410                         return rc;
 411
 412                 ahci_init_controller(host);
 413         }
 414
 415         ata_host_resume(host);
 416
 417         return 0;
 418 }
 419 #endif
 420
 421 SIMPLE_DEV_PM_OPS(ahci_highbank_pm_ops,
 422                   ahci_highbank_suspend, ahci_highbank_resume);
 423
 424 static struct platform_driver ahci_highbank_driver = {
 425         .remove = ata_platform_remove_one,
 426         .driver = {
 427                 .name = "highbank-ahci",
 428                 .owner = THIS_MODULE,
 429                 .of_match_table = ahci_of_match,
 430                 .pm = &ahci_highbank_pm_ops,
 431         },
 432         .probe = ahci_highbank_probe,
 433 };
 434
 435 module_platform_driver(ahci_highbank_driver);
 436
 437 MODULE_DESCRIPTION("Calxeda Highbank AHCI SATA platform driver");
 438 MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@calxeda.com>");
 439 MODULE_LICENSE("GPL");
 440 MODULE_ALIAS("sata:highbank");