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/types.h>
  23 #include <linux/err.h>
  24 #include <linux/io.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/device.h>
  27 #include <linux/of_device.h>
  28 #include <linux/of_address.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/libata.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/delay.h>
  33 #include <linux/export.h>
  34 #include <linux/gpio.h>
  35 #include <linux/of_gpio.h>
  36
  37 #include "ahci.h"
  38
  39 #define CPHY_MAP(dev, addr) ((((dev) & 0x1f) << 7) | (((addr) >> 9) & 0x7f))
  40 #define CPHY_ADDR(addr) (((addr) & 0x1ff) << 2)
  41 #define SERDES_CR_CTL                   0x80a0
  42 #define SERDES_CR_ADDR                  0x80a1
  43 #define SERDES_CR_DATA                  0x80a2
  44 #define CR_BUSY                         0x0001
  45 #define CR_START                        0x0001
  46 #define CR_WR_RDN                       0x0002
  47 #define CPHY_TX_INPUT_STS               0x2001
  48 #define CPHY_RX_INPUT_STS               0x2002
  49 #define CPHY_SATA_TX_OVERRIDE           0x8000
  50 #define CPHY_SATA_RX_OVERRIDE           0x4000
  51 #define CPHY_TX_OVERRIDE                0x2004
  52 #define CPHY_RX_OVERRIDE                0x2005
  53 #define SPHY_LANE                       0x100
  54 #define SPHY_HALF_RATE                  0x0001
  55 #define CPHY_SATA_DPLL_MODE             0x0700
  56 #define CPHY_SATA_DPLL_SHIFT            8
  57 #define CPHY_SATA_DPLL_RESET            (1 << 11)
  58 #define CPHY_SATA_TX_ATTEN              0x1c00
  59 #define CPHY_SATA_TX_ATTEN_SHIFT        10
  60 #define CPHY_PHY_COUNT                  6
  61 #define CPHY_LANE_COUNT                 4
  62 #define CPHY_PORT_COUNT                 (CPHY_PHY_COUNT * CPHY_LANE_COUNT)
  63
  64 static DEFINE_SPINLOCK(cphy_lock);
  65 /* Each of the 6 phys can have up to 4 sata ports attached to i. Map 0-based
  66  * sata ports to their phys and then to their lanes within the phys
  67  */
  68 struct phy_lane_info {
  69         void __iomem *phy_base;
  70         u8 lane_mapping;
  71         u8 phy_devs;
  72         u8 tx_atten;
  73 };
  74 static struct phy_lane_info port_data[CPHY_PORT_COUNT];
  75
  76 static DEFINE_SPINLOCK(sgpio_lock);
  77 #define SCLOCK                          0
  78 #define SLOAD                           1
  79 #define SDATA                           2
  80 #define SGPIO_PINS                      3
  81 #define SGPIO_PORTS                     8
  82
  83 struct ecx_plat_data {
  84         u32             n_ports;
  85         /* number of extra clocks that the SGPIO PIC controller expects */
  86         u32             pre_clocks;
  87         u32             post_clocks;
  88         unsigned        sgpio_gpio[SGPIO_PINS];
  89         u32             sgpio_pattern;
  90         u32             port_to_sgpio[SGPIO_PORTS];
  91 };
  92
  93 #define SGPIO_SIGNALS                   3
  94 #define ECX_ACTIVITY_BITS               0x300000
  95 #define ECX_ACTIVITY_SHIFT              0
  96 #define ECX_LOCATE_BITS                 0x80000
  97 #define ECX_LOCATE_SHIFT                1
  98 #define ECX_FAULT_BITS                  0x400000
  99 #define ECX_FAULT_SHIFT                 2
 100 static inline int sgpio_bit_shift(struct ecx_plat_data *pdata, u32 port,
 101                                 u32 shift)
 102 {
 103         return 1 << (3 * pdata->port_to_sgpio[port] + shift);
 104 }
 105
 106 static void ecx_parse_sgpio(struct ecx_plat_data *pdata, u32 port, u32 state)
 107 {
 108         if (state & ECX_ACTIVITY_BITS)
 109                 pdata->sgpio_pattern |= sgpio_bit_shift(pdata, port,
 110                                                 ECX_ACTIVITY_SHIFT);
 111         else
 112                 pdata->sgpio_pattern &= ~sgpio_bit_shift(pdata, port,
 113                                                 ECX_ACTIVITY_SHIFT);
 114         if (state & ECX_LOCATE_BITS)
 115                 pdata->sgpio_pattern |= sgpio_bit_shift(pdata, port,
 116                                                 ECX_LOCATE_SHIFT);
 117         else
 118                 pdata->sgpio_pattern &= ~sgpio_bit_shift(pdata, port,
 119                                                 ECX_LOCATE_SHIFT);
 120         if (state & ECX_FAULT_BITS)
 121                 pdata->sgpio_pattern |= sgpio_bit_shift(pdata, port,
 122                                                 ECX_FAULT_SHIFT);
 123         else
 124                 pdata->sgpio_pattern &= ~sgpio_bit_shift(pdata, port,
 125                                                 ECX_FAULT_SHIFT);
 126 }
 127
 128 /*
 129  * Tell the LED controller that the signal has changed by raising the clock
 130  * line for 50 uS and then lowering it for 50 uS.
 131  */
 132 static void ecx_led_cycle_clock(struct ecx_plat_data *pdata)
 133 {
 134         gpio_set_value(pdata->sgpio_gpio[SCLOCK], 1);
 135         udelay(50);
 136         gpio_set_value(pdata->sgpio_gpio[SCLOCK], 0);
 137         udelay(50);
 138 }
 139
 140 static ssize_t ecx_transmit_led_message(struct ata_port *ap, u32 state,
 141                                         ssize_t size)
 142 {
 143         struct ahci_host_priv *hpriv =  ap->host->private_data;
 144         struct ecx_plat_data *pdata = hpriv->plat_data;
 145         struct ahci_port_priv *pp = ap->private_data;
 146         unsigned long flags;
 147         int pmp, i;
 148         struct ahci_em_priv *emp;
 149         u32 sgpio_out;
 150
 151         /* get the slot number from the message */
 152         pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
 153         if (pmp < EM_MAX_SLOTS)
 154                 emp = &pp->em_priv[pmp];
 155         else
 156                 return -EINVAL;
 157
 158         if (!(hpriv->em_msg_type & EM_MSG_TYPE_LED))
 159                 return size;
 160
 161         spin_lock_irqsave(&sgpio_lock, flags);
 162         ecx_parse_sgpio(pdata, ap->port_no, state);
 163         sgpio_out = pdata->sgpio_pattern;
 164         for (i = 0; i < pdata->pre_clocks; i++)
 165                 ecx_led_cycle_clock(pdata);
 166
 167         gpio_set_value(pdata->sgpio_gpio[SLOAD], 1);
 168         ecx_led_cycle_clock(pdata);
 169         gpio_set_value(pdata->sgpio_gpio[SLOAD], 0);
 170         /*
 171          * bit-bang out the SGPIO pattern, by consuming a bit and then
 172          * clocking it out.
 173          */
 174         for (i = 0; i < (SGPIO_SIGNALS * pdata->n_ports); i++) {
 175                 gpio_set_value(pdata->sgpio_gpio[SDATA], sgpio_out & 1);
 176                 sgpio_out >>= 1;
 177                 ecx_led_cycle_clock(pdata);
 178         }
 179         for (i = 0; i < pdata->post_clocks; i++)
 180                 ecx_led_cycle_clock(pdata);
 181
 182         /* save off new led state for port/slot */
 183         emp->led_state = state;
 184
 185         spin_unlock_irqrestore(&sgpio_lock, flags);
 186         return size;
 187 }
 188
 189 static void highbank_set_em_messages(struct device *dev,
 190                                         struct ahci_host_priv *hpriv,
 191                                         struct ata_port_info *pi)
 192 {
 193         struct device_node *np = dev->of_node;
 194         struct ecx_plat_data *pdata = hpriv->plat_data;
 195         int i;
 196         int err;
 197
 198         for (i = 0; i < SGPIO_PINS; i++) {
 199                 err = of_get_named_gpio(np, "calxeda,sgpio-gpio", i);
 200                 if (err < 0)
 201                         return;
 202
 203                 pdata->sgpio_gpio[i] = err;
 204                 err = gpio_request(pdata->sgpio_gpio[i], "CX SGPIO");
 205                 if (err) {
 206                         pr_err("sata_highbank gpio_request %d failed: %d\n",
 207                                         i, err);
 208                         return;
 209                 }
 210                 gpio_direction_output(pdata->sgpio_gpio[i], 1);
 211         }
 212         of_property_read_u32_array(np, "calxeda,led-order",
 213                                                 pdata->port_to_sgpio,
 214                                                 pdata->n_ports);
 215         if (of_property_read_u32(np, "calxeda,pre-clocks", &pdata->pre_clocks))
 216                 pdata->pre_clocks = 0;
 217         if (of_property_read_u32(np, "calxeda,post-clocks",
 218                                 &pdata->post_clocks))
 219                 pdata->post_clocks = 0;
 220
 221         /* store em_loc */
 222         hpriv->em_loc = 0;
 223         hpriv->em_buf_sz = 4;
 224         hpriv->em_msg_type = EM_MSG_TYPE_LED;
 225         pi->flags |= ATA_FLAG_EM | ATA_FLAG_SW_ACTIVITY;
 226 }
 227
 228 static u32 __combo_phy_reg_read(u8 sata_port, u32 addr)
 229 {
 230         u32 data;
 231         u8 dev = port_data[sata_port].phy_devs;
 232         spin_lock(&cphy_lock);
 233         writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800);
 234         data = readl(port_data[sata_port].phy_base + CPHY_ADDR(addr));
 235         spin_unlock(&cphy_lock);
 236         return data;
 237 }
 238
 239 static void __combo_phy_reg_write(u8 sata_port, u32 addr, u32 data)
 240 {
 241         u8 dev = port_data[sata_port].phy_devs;
 242         spin_lock(&cphy_lock);
 243         writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800);
 244         writel(data, port_data[sata_port].phy_base + CPHY_ADDR(addr));
 245         spin_unlock(&cphy_lock);
 246 }
 247
 248 static void combo_phy_wait_for_ready(u8 sata_port)
 249 {
 250         while (__combo_phy_reg_read(sata_port, SERDES_CR_CTL) & CR_BUSY)
 251                 udelay(5);
 252 }
 253
 254 static u32 combo_phy_read(u8 sata_port, u32 addr)
 255 {
 256         combo_phy_wait_for_ready(sata_port);
 257         __combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr);
 258         __combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_START);
 259         combo_phy_wait_for_ready(sata_port);
 260         return __combo_phy_reg_read(sata_port, SERDES_CR_DATA);
 261 }
 262
 263 static void combo_phy_write(u8 sata_port, u32 addr, u32 data)
 264 {
 265         combo_phy_wait_for_ready(sata_port);
 266         __combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr);
 267         __combo_phy_reg_write(sata_port, SERDES_CR_DATA, data);
 268         __combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_WR_RDN | CR_START);
 269 }
 270
 271 static void highbank_cphy_disable_overrides(u8 sata_port)
 272 {
 273         u8 lane = port_data[sata_port].lane_mapping;
 274         u32 tmp;
 275         if (unlikely(port_data[sata_port].phy_base == NULL))
 276                 return;
 277         tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
 278         tmp &= ~CPHY_SATA_RX_OVERRIDE;
 279         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 280 }
 281
 282 static void cphy_override_tx_attenuation(u8 sata_port, u32 val)
 283 {
 284         u8 lane = port_data[sata_port].lane_mapping;
 285         u32 tmp;
 286
 287         if (val & 0x8)
 288                 return;
 289
 290         tmp = combo_phy_read(sata_port, CPHY_TX_INPUT_STS + lane * SPHY_LANE);
 291         tmp &= ~CPHY_SATA_TX_OVERRIDE;
 292         combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp);
 293
 294         tmp |= CPHY_SATA_TX_OVERRIDE;
 295         combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp);
 296
 297         tmp |= (val << CPHY_SATA_TX_ATTEN_SHIFT) & CPHY_SATA_TX_ATTEN;
 298         combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp);
 299 }
 300
 301 static void cphy_override_rx_mode(u8 sata_port, u32 val)
 302 {
 303         u8 lane = port_data[sata_port].lane_mapping;
 304         u32 tmp;
 305         tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
 306         tmp &= ~CPHY_SATA_RX_OVERRIDE;
 307         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 308
 309         tmp |= CPHY_SATA_RX_OVERRIDE;
 310         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 311
 312         tmp &= ~CPHY_SATA_DPLL_MODE;
 313         tmp |= val << CPHY_SATA_DPLL_SHIFT;
 314         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 315
 316         tmp |= CPHY_SATA_DPLL_RESET;
 317         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 318
 319         tmp &= ~CPHY_SATA_DPLL_RESET;
 320         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 321
 322         msleep(15);
 323 }
 324
 325 static void highbank_cphy_override_lane(u8 sata_port)
 326 {
 327         u8 lane = port_data[sata_port].lane_mapping;
 328         u32 tmp, k = 0;
 329
 330         if (unlikely(port_data[sata_port].phy_base == NULL))
 331                 return;
 332         do {
 333                 tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS +
 334                                                 lane * SPHY_LANE);
 335         } while ((tmp & SPHY_HALF_RATE) && (k++ < 1000));
 336         cphy_override_rx_mode(sata_port, 3);
 337         cphy_override_tx_attenuation(sata_port, port_data[sata_port].tx_atten);
 338 }
 339
 340 static int highbank_initialize_phys(struct device *dev, void __iomem *addr)
 341 {
 342         struct device_node *sata_node = dev->of_node;
 343         int phy_count = 0, phy, port = 0, i;
 344         void __iomem *cphy_base[CPHY_PHY_COUNT] = {};
 345         struct device_node *phy_nodes[CPHY_PHY_COUNT] = {};
 346         u32 tx_atten[CPHY_PORT_COUNT] = {};
 347
 348         memset(port_data, 0, sizeof(struct phy_lane_info) * CPHY_PORT_COUNT);
 349
 350         do {
 351                 u32 tmp;
 352                 struct of_phandle_args phy_data;
 353                 if (of_parse_phandle_with_args(sata_node,
 354                                 "calxeda,port-phys", "#phy-cells",
 355                                 port, &phy_data))
 356                         break;
 357                 for (phy = 0; phy < phy_count; phy++) {
 358                         if (phy_nodes[phy] == phy_data.np)
 359                                 break;
 360                 }
 361                 if (phy_nodes[phy] == NULL) {
 362                         phy_nodes[phy] = phy_data.np;
 363                         cphy_base[phy] = of_iomap(phy_nodes[phy], 0);
 364                         if (cphy_base[phy] == NULL) {
 365                                 return 0;
 366                         }
 367                         phy_count += 1;
 368                 }
 369                 port_data[port].lane_mapping = phy_data.args[0];
 370                 of_property_read_u32(phy_nodes[phy], "phydev", &tmp);
 371                 port_data[port].phy_devs = tmp;
 372                 port_data[port].phy_base = cphy_base[phy];
 373                 of_node_put(phy_data.np);
 374                 port += 1;
 375         } while (port < CPHY_PORT_COUNT);
 376         of_property_read_u32_array(sata_node, "calxeda,tx-atten",
 377                                 tx_atten, port);
 378         for (i = 0; i < port; i++)
 379                 port_data[i].tx_atten = (u8) tx_atten[i];
 380         return 0;
 381 }
 382
 383 /*
 384  * The Calxeda SATA phy intermittently fails to bring up a link with Gen3
 385  * Retrying the phy hard reset can work around the issue, but the drive
 386  * may fail again. In less than 150 out of 15000 test runs, it took more
 387  * than 10 tries for the link to be established (but never more than 35).
 388  * Triple the maximum observed retry count to provide plenty of margin for
 389  * rare events and to guarantee that the link is established.
 390  *
 391  * Also, the default 2 second time-out on a failed drive is too long in
 392  * this situation. The uboot implementation of the same driver function
 393  * uses a much shorter time-out period and never experiences a time out
 394  * issue. Reducing the time-out to 500ms improves the responsiveness.
 395  * The other timing constants were kept the same as the stock AHCI driver.
 396  * This change was also tested 15000 times on 24 drives and none of them
 397  * experienced a time out.
 398  */
 399 static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
 400                                 unsigned long deadline)
 401 {
 402         static const unsigned long timing[] = { 5, 100, 500};
 403         struct ata_port *ap = link->ap;
 404         struct ahci_port_priv *pp = ap->private_data;
 405         struct ahci_host_priv *hpriv = ap->host->private_data;
 406         u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
 407         struct ata_taskfile tf;
 408         bool online;
 409         u32 sstatus;
 410         int rc;
 411         int retry = 100;
 412
 413         ahci_stop_engine(ap);
 414
 415         /* clear D2H reception area to properly wait for D2H FIS */
 416         ata_tf_init(link->device, &tf);
 417         tf.command = ATA_BUSY;
 418         ata_tf_to_fis(&tf, 0, 0, d2h_fis);
 419
 420         do {
 421                 highbank_cphy_disable_overrides(link->ap->port_no);
 422                 rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
 423                 highbank_cphy_override_lane(link->ap->port_no);
 424
 425                 /* If the status is 1, we are connected, but the link did not
 426                  * come up. So retry resetting the link again.
 427                  */
 428                 if (sata_scr_read(link, SCR_STATUS, &sstatus))
 429                         break;
 430                 if (!(sstatus & 0x3))
 431                         break;
 432         } while (!online && retry--);
 433
 434         hpriv->start_engine(ap);
 435
 436         if (online)
 437                 *class = ahci_dev_classify(ap);
 438
 439         return rc;
 440 }
 441
 442 static struct ata_port_operations ahci_highbank_ops = {
 443         .inherits               = &ahci_ops,
 444         .hardreset              = ahci_highbank_hardreset,
 445         .transmit_led_message   = ecx_transmit_led_message,
 446 };
 447
 448 static const struct ata_port_info ahci_highbank_port_info = {
 449         .flags          = AHCI_FLAG_COMMON,
 450         .pio_mask       = ATA_PIO4,
 451         .udma_mask      = ATA_UDMA6,
 452         .port_ops       = &ahci_highbank_ops,
 453 };
 454
 455 static struct scsi_host_template ahci_highbank_platform_sht = {
 456         AHCI_SHT("sata_highbank"),
 457 };
 458
 459 static const struct of_device_id ahci_of_match[] = {
 460         { .compatible = "calxeda,hb-ahci" },
 461         {},
 462 };
 463 MODULE_DEVICE_TABLE(of, ahci_of_match);
 464
 465 static int ahci_highbank_probe(struct platform_device *pdev)
 466 {
 467         struct device *dev = &pdev->dev;
 468         struct ahci_host_priv *hpriv;
 469         struct ecx_plat_data *pdata;
 470         struct ata_host *host;
 471         struct resource *mem;
 472         int irq;
 473         int i;
 474         int rc;
 475         u32 n_ports;
 476         struct ata_port_info pi = ahci_highbank_port_info;
 477         const struct ata_port_info *ppi[] = { &pi, NULL };
 478
 479         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 480         if (!mem) {
 481                 dev_err(dev, "no mmio space\n");
 482                 return -EINVAL;
 483         }
 484
 485         irq = platform_get_irq(pdev, 0);
 486         if (irq <= 0) {
 487                 dev_err(dev, "no irq\n");
 488                 return -EINVAL;
 489         }
 490
 491         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
 492         if (!hpriv) {
 493                 dev_err(dev, "can't alloc ahci_host_priv\n");
 494                 return -ENOMEM;
 495         }
 496         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 497         if (!pdata) {
 498                 dev_err(dev, "can't alloc ecx_plat_data\n");
 499                 return -ENOMEM;
 500         }
 501
 502         hpriv->irq = irq;
 503         hpriv->flags |= (unsigned long)pi.private_data;
 504
 505         hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
 506         if (!hpriv->mmio) {
 507                 dev_err(dev, "can't map %pR\n", mem);
 508                 return -ENOMEM;
 509         }
 510
 511         rc = highbank_initialize_phys(dev, hpriv->mmio);
 512         if (rc)
 513                 return rc;
 514
 515
 516         ahci_save_initial_config(dev, hpriv);
 517
 518         /* prepare host */
 519         if (hpriv->cap & HOST_CAP_NCQ)
 520                 pi.flags |= ATA_FLAG_NCQ;
 521
 522         if (hpriv->cap & HOST_CAP_PMP)
 523                 pi.flags |= ATA_FLAG_PMP;
 524
 525         if (hpriv->cap & HOST_CAP_64)
 526                 dma_set_coherent_mask(dev, DMA_BIT_MASK(64));
 527
 528         /* CAP.NP sometimes indicate the index of the last enabled
 529          * port, at other times, that of the last possible port, so
 530          * determining the maximum port number requires looking at
 531          * both CAP.NP and port_map.
 532          */
 533         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 534
 535         pdata->n_ports = n_ports;
 536         hpriv->plat_data = pdata;
 537         highbank_set_em_messages(dev, hpriv, &pi);
 538
 539         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 540         if (!host) {
 541                 rc = -ENOMEM;
 542                 goto err0;
 543         }
 544
 545         host->private_data = hpriv;
 546
 547         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 548                 host->flags |= ATA_HOST_PARALLEL_SCAN;
 549
 550         for (i = 0; i < host->n_ports; i++) {
 551                 struct ata_port *ap = host->ports[i];
 552
 553                 ata_port_desc(ap, "mmio %pR", mem);
 554                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
 555
 556                 /* set enclosure management message type */
 557                 if (ap->flags & ATA_FLAG_EM)
 558                         ap->em_message_type = hpriv->em_msg_type;
 559
 560                 /* disabled/not-implemented port */
 561                 if (!(hpriv->port_map & (1 << i)))
 562                         ap->ops = &ata_dummy_port_ops;
 563         }
 564
 565         rc = ahci_reset_controller(host);
 566         if (rc)
 567                 goto err0;
 568
 569         ahci_init_controller(host);
 570         ahci_print_info(host, "platform");
 571
 572         rc = ahci_host_activate(host, &ahci_highbank_platform_sht);
 573         if (rc)
 574                 goto err0;
 575
 576         return 0;
 577 err0:
 578         return rc;
 579 }
 580
 581 #ifdef CONFIG_PM_SLEEP
 582 static int ahci_highbank_suspend(struct device *dev)
 583 {
 584         struct ata_host *host = dev_get_drvdata(dev);
 585         struct ahci_host_priv *hpriv = host->private_data;
 586         void __iomem *mmio = hpriv->mmio;
 587         u32 ctl;
 588         int rc;
 589
 590         if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
 591                 dev_err(dev, "firmware update required for suspend/resume\n");
 592                 return -EIO;
 593         }
 594
 595         /*
 596          * AHCI spec rev1.1 section 8.3.3:
 597          * Software must disable interrupts prior to requesting a
 598          * transition of the HBA to D3 state.
 599          */
 600         ctl = readl(mmio + HOST_CTL);
 601         ctl &= ~HOST_IRQ_EN;
 602         writel(ctl, mmio + HOST_CTL);
 603         readl(mmio + HOST_CTL); /* flush */
 604
 605         rc = ata_host_suspend(host, PMSG_SUSPEND);
 606         if (rc)
 607                 return rc;
 608
 609         return 0;
 610 }
 611
 612 static int ahci_highbank_resume(struct device *dev)
 613 {
 614         struct ata_host *host = dev_get_drvdata(dev);
 615         int rc;
 616
 617         if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
 618                 rc = ahci_reset_controller(host);
 619                 if (rc)
 620                         return rc;
 621
 622                 ahci_init_controller(host);
 623         }
 624
 625         ata_host_resume(host);
 626
 627         return 0;
 628 }
 629 #endif
 630
 631 static SIMPLE_DEV_PM_OPS(ahci_highbank_pm_ops,
 632                   ahci_highbank_suspend, ahci_highbank_resume);
 633
 634 static struct platform_driver ahci_highbank_driver = {
 635         .remove = ata_platform_remove_one,
 636         .driver = {
 637                 .name = "highbank-ahci",
 638                 .of_match_table = ahci_of_match,
 639                 .pm = &ahci_highbank_pm_ops,
 640         },
 641         .probe = ahci_highbank_probe,
 642 };
 643
 644 module_platform_driver(ahci_highbank_driver);
 645
 646 MODULE_DESCRIPTION("Calxeda Highbank AHCI SATA platform driver");
 647 MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@calxeda.com>");
 648 MODULE_LICENSE("GPL");
 649 MODULE_ALIAS("sata:highbank");