drivers/ata/sata_highbank.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Calxeda Highbank AHCI SATA platform driver
   4  * Copyright 2012 Calxeda, Inc.
   5  *
   6  * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/gfp.h>
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/err.h>
  13 #include <linux/io.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/device.h>
  16 #include <linux/of_device.h>
  17 #include <linux/of_address.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/libata.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/delay.h>
  22 #include <linux/export.h>
  23 #include <linux/gpio/consumer.h>
  24
  25 #include "ahci.h"
  26
  27 #define CPHY_MAP(dev, addr) ((((dev) & 0x1f) << 7) | (((addr) >> 9) & 0x7f))
  28 #define CPHY_ADDR(addr) (((addr) & 0x1ff) << 2)
  29 #define SERDES_CR_CTL                   0x80a0
  30 #define SERDES_CR_ADDR                  0x80a1
  31 #define SERDES_CR_DATA                  0x80a2
  32 #define CR_BUSY                         0x0001
  33 #define CR_START                        0x0001
  34 #define CR_WR_RDN                       0x0002
  35 #define CPHY_TX_INPUT_STS               0x2001
  36 #define CPHY_RX_INPUT_STS               0x2002
  37 #define CPHY_SATA_TX_OVERRIDE           0x8000
  38 #define CPHY_SATA_RX_OVERRIDE           0x4000
  39 #define CPHY_TX_OVERRIDE                0x2004
  40 #define CPHY_RX_OVERRIDE                0x2005
  41 #define SPHY_LANE                       0x100
  42 #define SPHY_HALF_RATE                  0x0001
  43 #define CPHY_SATA_DPLL_MODE             0x0700
  44 #define CPHY_SATA_DPLL_SHIFT            8
  45 #define CPHY_SATA_DPLL_RESET            (1 << 11)
  46 #define CPHY_SATA_TX_ATTEN              0x1c00
  47 #define CPHY_SATA_TX_ATTEN_SHIFT        10
  48 #define CPHY_PHY_COUNT                  6
  49 #define CPHY_LANE_COUNT                 4
  50 #define CPHY_PORT_COUNT                 (CPHY_PHY_COUNT * CPHY_LANE_COUNT)
  51
  52 static DEFINE_SPINLOCK(cphy_lock);
  53 /* Each of the 6 phys can have up to 4 sata ports attached to i. Map 0-based
  54  * sata ports to their phys and then to their lanes within the phys
  55  */
  56 struct phy_lane_info {
  57         void __iomem *phy_base;
  58         u8 lane_mapping;
  59         u8 phy_devs;
  60         u8 tx_atten;
  61 };
  62 static struct phy_lane_info port_data[CPHY_PORT_COUNT];
  63
  64 static DEFINE_SPINLOCK(sgpio_lock);
  65 #define SCLOCK                          0
  66 #define SLOAD                           1
  67 #define SDATA                           2
  68 #define SGPIO_PINS                      3
  69 #define SGPIO_PORTS                     8
  70
  71 struct ecx_plat_data {
  72         u32             n_ports;
  73         /* number of extra clocks that the SGPIO PIC controller expects */
  74         u32             pre_clocks;
  75         u32             post_clocks;
  76         struct gpio_desc *sgpio_gpiod[SGPIO_PINS];
  77         u32             sgpio_pattern;
  78         u32             port_to_sgpio[SGPIO_PORTS];
  79 };
  80
  81 #define SGPIO_SIGNALS                   3
  82 #define ECX_ACTIVITY_BITS               0x300000
  83 #define ECX_ACTIVITY_SHIFT              0
  84 #define ECX_LOCATE_BITS                 0x80000
  85 #define ECX_LOCATE_SHIFT                1
  86 #define ECX_FAULT_BITS                  0x400000
  87 #define ECX_FAULT_SHIFT                 2
  88 static inline int sgpio_bit_shift(struct ecx_plat_data *pdata, u32 port,
  89                                 u32 shift)
  90 {
  91         return 1 << (3 * pdata->port_to_sgpio[port] + shift);
  92 }
  93
  94 static void ecx_parse_sgpio(struct ecx_plat_data *pdata, u32 port, u32 state)
  95 {
  96         if (state & ECX_ACTIVITY_BITS)
  97                 pdata->sgpio_pattern |= sgpio_bit_shift(pdata, port,
  98                                                 ECX_ACTIVITY_SHIFT);
  99         else
 100                 pdata->sgpio_pattern &= ~sgpio_bit_shift(pdata, port,
 101                                                 ECX_ACTIVITY_SHIFT);
 102         if (state & ECX_LOCATE_BITS)
 103                 pdata->sgpio_pattern |= sgpio_bit_shift(pdata, port,
 104                                                 ECX_LOCATE_SHIFT);
 105         else
 106                 pdata->sgpio_pattern &= ~sgpio_bit_shift(pdata, port,
 107                                                 ECX_LOCATE_SHIFT);
 108         if (state & ECX_FAULT_BITS)
 109                 pdata->sgpio_pattern |= sgpio_bit_shift(pdata, port,
 110                                                 ECX_FAULT_SHIFT);
 111         else
 112                 pdata->sgpio_pattern &= ~sgpio_bit_shift(pdata, port,
 113                                                 ECX_FAULT_SHIFT);
 114 }
 115
 116 /*
 117  * Tell the LED controller that the signal has changed by raising the clock
 118  * line for 50 uS and then lowering it for 50 uS.
 119  */
 120 static void ecx_led_cycle_clock(struct ecx_plat_data *pdata)
 121 {
 122         gpiod_set_value(pdata->sgpio_gpiod[SCLOCK], 1);
 123         udelay(50);
 124         gpiod_set_value(pdata->sgpio_gpiod[SCLOCK], 0);
 125         udelay(50);
 126 }
 127
 128 static ssize_t ecx_transmit_led_message(struct ata_port *ap, u32 state,
 129                                         ssize_t size)
 130 {
 131         struct ahci_host_priv *hpriv =  ap->host->private_data;
 132         struct ecx_plat_data *pdata = hpriv->plat_data;
 133         struct ahci_port_priv *pp = ap->private_data;
 134         unsigned long flags;
 135         int pmp, i;
 136         struct ahci_em_priv *emp;
 137         u32 sgpio_out;
 138
 139         /* get the slot number from the message */
 140         pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
 141         if (pmp < EM_MAX_SLOTS)
 142                 emp = &pp->em_priv[pmp];
 143         else
 144                 return -EINVAL;
 145
 146         if (!(hpriv->em_msg_type & EM_MSG_TYPE_LED))
 147                 return size;
 148
 149         spin_lock_irqsave(&sgpio_lock, flags);
 150         ecx_parse_sgpio(pdata, ap->port_no, state);
 151         sgpio_out = pdata->sgpio_pattern;
 152         for (i = 0; i < pdata->pre_clocks; i++)
 153                 ecx_led_cycle_clock(pdata);
 154
 155         gpiod_set_value(pdata->sgpio_gpiod[SLOAD], 1);
 156         ecx_led_cycle_clock(pdata);
 157         gpiod_set_value(pdata->sgpio_gpiod[SLOAD], 0);
 158         /*
 159          * bit-bang out the SGPIO pattern, by consuming a bit and then
 160          * clocking it out.
 161          */
 162         for (i = 0; i < (SGPIO_SIGNALS * pdata->n_ports); i++) {
 163                 gpiod_set_value(pdata->sgpio_gpiod[SDATA], sgpio_out & 1);
 164                 sgpio_out >>= 1;
 165                 ecx_led_cycle_clock(pdata);
 166         }
 167         for (i = 0; i < pdata->post_clocks; i++)
 168                 ecx_led_cycle_clock(pdata);
 169
 170         /* save off new led state for port/slot */
 171         emp->led_state = state;
 172
 173         spin_unlock_irqrestore(&sgpio_lock, flags);
 174         return size;
 175 }
 176
 177 static void highbank_set_em_messages(struct device *dev,
 178                                         struct ahci_host_priv *hpriv,
 179                                         struct ata_port_info *pi)
 180 {
 181         struct device_node *np = dev->of_node;
 182         struct ecx_plat_data *pdata = hpriv->plat_data;
 183         int i;
 184
 185         for (i = 0; i < SGPIO_PINS; i++) {
 186                 struct gpio_desc *gpiod;
 187
 188                 gpiod = devm_gpiod_get_index(dev, "calxeda,sgpio", i,
 189                                              GPIOD_OUT_HIGH);
 190                 if (IS_ERR(gpiod)) {
 191                         dev_err(dev, "failed to get GPIO %d\n", i);
 192                         continue;
 193                 }
 194                 gpiod_set_consumer_name(gpiod, "CX SGPIO");
 195
 196                 pdata->sgpio_gpiod[i] = gpiod;
 197         }
 198         of_property_read_u32_array(np, "calxeda,led-order",
 199                                                 pdata->port_to_sgpio,
 200                                                 pdata->n_ports);
 201         if (of_property_read_u32(np, "calxeda,pre-clocks", &pdata->pre_clocks))
 202                 pdata->pre_clocks = 0;
 203         if (of_property_read_u32(np, "calxeda,post-clocks",
 204                                 &pdata->post_clocks))
 205                 pdata->post_clocks = 0;
 206
 207         /* store em_loc */
 208         hpriv->em_loc = 0;
 209         hpriv->em_buf_sz = 4;
 210         hpriv->em_msg_type = EM_MSG_TYPE_LED;
 211         pi->flags |= ATA_FLAG_EM | ATA_FLAG_SW_ACTIVITY;
 212 }
 213
 214 static u32 __combo_phy_reg_read(u8 sata_port, u32 addr)
 215 {
 216         u32 data;
 217         u8 dev = port_data[sata_port].phy_devs;
 218         spin_lock(&cphy_lock);
 219         writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800);
 220         data = readl(port_data[sata_port].phy_base + CPHY_ADDR(addr));
 221         spin_unlock(&cphy_lock);
 222         return data;
 223 }
 224
 225 static void __combo_phy_reg_write(u8 sata_port, u32 addr, u32 data)
 226 {
 227         u8 dev = port_data[sata_port].phy_devs;
 228         spin_lock(&cphy_lock);
 229         writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800);
 230         writel(data, port_data[sata_port].phy_base + CPHY_ADDR(addr));
 231         spin_unlock(&cphy_lock);
 232 }
 233
 234 static void combo_phy_wait_for_ready(u8 sata_port)
 235 {
 236         while (__combo_phy_reg_read(sata_port, SERDES_CR_CTL) & CR_BUSY)
 237                 udelay(5);
 238 }
 239
 240 static u32 combo_phy_read(u8 sata_port, u32 addr)
 241 {
 242         combo_phy_wait_for_ready(sata_port);
 243         __combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr);
 244         __combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_START);
 245         combo_phy_wait_for_ready(sata_port);
 246         return __combo_phy_reg_read(sata_port, SERDES_CR_DATA);
 247 }
 248
 249 static void combo_phy_write(u8 sata_port, u32 addr, u32 data)
 250 {
 251         combo_phy_wait_for_ready(sata_port);
 252         __combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr);
 253         __combo_phy_reg_write(sata_port, SERDES_CR_DATA, data);
 254         __combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_WR_RDN | CR_START);
 255 }
 256
 257 static void highbank_cphy_disable_overrides(u8 sata_port)
 258 {
 259         u8 lane = port_data[sata_port].lane_mapping;
 260         u32 tmp;
 261         if (unlikely(port_data[sata_port].phy_base == NULL))
 262                 return;
 263         tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
 264         tmp &= ~CPHY_SATA_RX_OVERRIDE;
 265         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 266 }
 267
 268 static void cphy_override_tx_attenuation(u8 sata_port, u32 val)
 269 {
 270         u8 lane = port_data[sata_port].lane_mapping;
 271         u32 tmp;
 272
 273         if (val & 0x8)
 274                 return;
 275
 276         tmp = combo_phy_read(sata_port, CPHY_TX_INPUT_STS + lane * SPHY_LANE);
 277         tmp &= ~CPHY_SATA_TX_OVERRIDE;
 278         combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp);
 279
 280         tmp |= CPHY_SATA_TX_OVERRIDE;
 281         combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp);
 282
 283         tmp |= (val << CPHY_SATA_TX_ATTEN_SHIFT) & CPHY_SATA_TX_ATTEN;
 284         combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp);
 285 }
 286
 287 static void cphy_override_rx_mode(u8 sata_port, u32 val)
 288 {
 289         u8 lane = port_data[sata_port].lane_mapping;
 290         u32 tmp;
 291         tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
 292         tmp &= ~CPHY_SATA_RX_OVERRIDE;
 293         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 294
 295         tmp |= CPHY_SATA_RX_OVERRIDE;
 296         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 297
 298         tmp &= ~CPHY_SATA_DPLL_MODE;
 299         tmp |= val << CPHY_SATA_DPLL_SHIFT;
 300         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 301
 302         tmp |= CPHY_SATA_DPLL_RESET;
 303         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 304
 305         tmp &= ~CPHY_SATA_DPLL_RESET;
 306         combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 307
 308         msleep(15);
 309 }
 310
 311 static void highbank_cphy_override_lane(u8 sata_port)
 312 {
 313         u8 lane = port_data[sata_port].lane_mapping;
 314         u32 tmp, k = 0;
 315
 316         if (unlikely(port_data[sata_port].phy_base == NULL))
 317                 return;
 318         do {
 319                 tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS +
 320                                                 lane * SPHY_LANE);
 321         } while ((tmp & SPHY_HALF_RATE) && (k++ < 1000));
 322         cphy_override_rx_mode(sata_port, 3);
 323         cphy_override_tx_attenuation(sata_port, port_data[sata_port].tx_atten);
 324 }
 325
 326 static int highbank_initialize_phys(struct device *dev, void __iomem *addr)
 327 {
 328         struct device_node *sata_node = dev->of_node;
 329         int phy_count = 0, phy, port = 0, i;
 330         void __iomem *cphy_base[CPHY_PHY_COUNT] = {};
 331         struct device_node *phy_nodes[CPHY_PHY_COUNT] = {};
 332         u32 tx_atten[CPHY_PORT_COUNT] = {};
 333
 334         memset(port_data, 0, sizeof(struct phy_lane_info) * CPHY_PORT_COUNT);
 335
 336         do {
 337                 u32 tmp;
 338                 struct of_phandle_args phy_data;
 339                 if (of_parse_phandle_with_args(sata_node,
 340                                 "calxeda,port-phys", "#phy-cells",
 341                                 port, &phy_data))
 342                         break;
 343                 for (phy = 0; phy < phy_count; phy++) {
 344                         if (phy_nodes[phy] == phy_data.np)
 345                                 break;
 346                 }
 347                 if (phy_nodes[phy] == NULL) {
 348                         phy_nodes[phy] = phy_data.np;
 349                         cphy_base[phy] = of_iomap(phy_nodes[phy], 0);
 350                         if (cphy_base[phy] == NULL) {
 351                                 return 0;
 352                         }
 353                         phy_count += 1;
 354                 }
 355                 port_data[port].lane_mapping = phy_data.args[0];
 356                 of_property_read_u32(phy_nodes[phy], "phydev", &tmp);
 357                 port_data[port].phy_devs = tmp;
 358                 port_data[port].phy_base = cphy_base[phy];
 359                 of_node_put(phy_data.np);
 360                 port += 1;
 361         } while (port < CPHY_PORT_COUNT);
 362         of_property_read_u32_array(sata_node, "calxeda,tx-atten",
 363                                 tx_atten, port);
 364         for (i = 0; i < port; i++)
 365                 port_data[i].tx_atten = (u8) tx_atten[i];
 366         return 0;
 367 }
 368
 369 /*
 370  * The Calxeda SATA phy intermittently fails to bring up a link with Gen3
 371  * Retrying the phy hard reset can work around the issue, but the drive
 372  * may fail again. In less than 150 out of 15000 test runs, it took more
 373  * than 10 tries for the link to be established (but never more than 35).
 374  * Triple the maximum observed retry count to provide plenty of margin for
 375  * rare events and to guarantee that the link is established.
 376  *
 377  * Also, the default 2 second time-out on a failed drive is too long in
 378  * this situation. The uboot implementation of the same driver function
 379  * uses a much shorter time-out period and never experiences a time out
 380  * issue. Reducing the time-out to 500ms improves the responsiveness.
 381  * The other timing constants were kept the same as the stock AHCI driver.
 382  * This change was also tested 15000 times on 24 drives and none of them
 383  * experienced a time out.
 384  */
 385 static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
 386                                 unsigned long deadline)
 387 {
 388         static const unsigned long timing[] = { 5, 100, 500};
 389         struct ata_port *ap = link->ap;
 390         struct ahci_port_priv *pp = ap->private_data;
 391         struct ahci_host_priv *hpriv = ap->host->private_data;
 392         u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
 393         struct ata_taskfile tf;
 394         bool online;
 395         u32 sstatus;
 396         int rc;
 397         int retry = 100;
 398
 399         hpriv->stop_engine(ap);
 400
 401         /* clear D2H reception area to properly wait for D2H FIS */
 402         ata_tf_init(link->device, &tf);
 403         tf.command = ATA_BUSY;
 404         ata_tf_to_fis(&tf, 0, 0, d2h_fis);
 405
 406         do {
 407                 highbank_cphy_disable_overrides(link->ap->port_no);
 408                 rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
 409                 highbank_cphy_override_lane(link->ap->port_no);
 410
 411                 /* If the status is 1, we are connected, but the link did not
 412                  * come up. So retry resetting the link again.
 413                  */
 414                 if (sata_scr_read(link, SCR_STATUS, &sstatus))
 415                         break;
 416                 if (!(sstatus & 0x3))
 417                         break;
 418         } while (!online && retry--);
 419
 420         hpriv->start_engine(ap);
 421
 422         if (online)
 423                 *class = ahci_dev_classify(ap);
 424
 425         return rc;
 426 }
 427
 428 static struct ata_port_operations ahci_highbank_ops = {
 429         .inherits               = &ahci_ops,
 430         .hardreset              = ahci_highbank_hardreset,
 431         .transmit_led_message   = ecx_transmit_led_message,
 432 };
 433
 434 static const struct ata_port_info ahci_highbank_port_info = {
 435         .flags          = AHCI_FLAG_COMMON,
 436         .pio_mask       = ATA_PIO4,
 437         .udma_mask      = ATA_UDMA6,
 438         .port_ops       = &ahci_highbank_ops,
 439 };
 440
 441 static struct scsi_host_template ahci_highbank_platform_sht = {
 442         AHCI_SHT("sata_highbank"),
 443 };
 444
 445 static const struct of_device_id ahci_of_match[] = {
 446         { .compatible = "calxeda,hb-ahci" },
 447         {},
 448 };
 449 MODULE_DEVICE_TABLE(of, ahci_of_match);
 450
 451 static int ahci_highbank_probe(struct platform_device *pdev)
 452 {
 453         struct device *dev = &pdev->dev;
 454         struct ahci_host_priv *hpriv;
 455         struct ecx_plat_data *pdata;
 456         struct ata_host *host;
 457         struct resource *mem;
 458         int irq;
 459         int i;
 460         int rc;
 461         u32 n_ports;
 462         struct ata_port_info pi = ahci_highbank_port_info;
 463         const struct ata_port_info *ppi[] = { &pi, NULL };
 464
 465         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 466         if (!mem) {
 467                 dev_err(dev, "no mmio space\n");
 468                 return -EINVAL;
 469         }
 470
 471         irq = platform_get_irq(pdev, 0);
 472         if (irq <= 0) {
 473                 dev_err(dev, "no irq\n");
 474                 return -EINVAL;
 475         }
 476
 477         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
 478         if (!hpriv) {
 479                 dev_err(dev, "can't alloc ahci_host_priv\n");
 480                 return -ENOMEM;
 481         }
 482         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 483         if (!pdata) {
 484                 dev_err(dev, "can't alloc ecx_plat_data\n");
 485                 return -ENOMEM;
 486         }
 487
 488         hpriv->irq = irq;
 489         hpriv->flags |= (unsigned long)pi.private_data;
 490
 491         hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
 492         if (!hpriv->mmio) {
 493                 dev_err(dev, "can't map %pR\n", mem);
 494                 return -ENOMEM;
 495         }
 496
 497         rc = highbank_initialize_phys(dev, hpriv->mmio);
 498         if (rc)
 499                 return rc;
 500
 501
 502         ahci_save_initial_config(dev, hpriv);
 503
 504         /* prepare host */
 505         if (hpriv->cap & HOST_CAP_NCQ)
 506                 pi.flags |= ATA_FLAG_NCQ;
 507
 508         if (hpriv->cap & HOST_CAP_PMP)
 509                 pi.flags |= ATA_FLAG_PMP;
 510
 511         if (hpriv->cap & HOST_CAP_64)
 512                 dma_set_coherent_mask(dev, DMA_BIT_MASK(64));
 513
 514         /* CAP.NP sometimes indicate the index of the last enabled
 515          * port, at other times, that of the last possible port, so
 516          * determining the maximum port number requires looking at
 517          * both CAP.NP and port_map.
 518          */
 519         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 520
 521         pdata->n_ports = n_ports;
 522         hpriv->plat_data = pdata;
 523         highbank_set_em_messages(dev, hpriv, &pi);
 524
 525         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 526         if (!host) {
 527                 rc = -ENOMEM;
 528                 goto err0;
 529         }
 530
 531         host->private_data = hpriv;
 532
 533         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 534                 host->flags |= ATA_HOST_PARALLEL_SCAN;
 535
 536         for (i = 0; i < host->n_ports; i++) {
 537                 struct ata_port *ap = host->ports[i];
 538
 539                 ata_port_desc(ap, "mmio %pR", mem);
 540                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
 541
 542                 /* set enclosure management message type */
 543                 if (ap->flags & ATA_FLAG_EM)
 544                         ap->em_message_type = hpriv->em_msg_type;
 545
 546                 /* disabled/not-implemented port */
 547                 if (!(hpriv->port_map & (1 << i)))
 548                         ap->ops = &ata_dummy_port_ops;
 549         }
 550
 551         rc = ahci_reset_controller(host);
 552         if (rc)
 553                 goto err0;
 554
 555         ahci_init_controller(host);
 556         ahci_print_info(host, "platform");
 557
 558         rc = ahci_host_activate(host, &ahci_highbank_platform_sht);
 559         if (rc)
 560                 goto err0;
 561
 562         return 0;
 563 err0:
 564         return rc;
 565 }
 566
 567 #ifdef CONFIG_PM_SLEEP
 568 static int ahci_highbank_suspend(struct device *dev)
 569 {
 570         struct ata_host *host = dev_get_drvdata(dev);
 571         struct ahci_host_priv *hpriv = host->private_data;
 572         void __iomem *mmio = hpriv->mmio;
 573         u32 ctl;
 574         int rc;
 575
 576         if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
 577                 dev_err(dev, "firmware update required for suspend/resume\n");
 578                 return -EIO;
 579         }
 580
 581         /*
 582          * AHCI spec rev1.1 section 8.3.3:
 583          * Software must disable interrupts prior to requesting a
 584          * transition of the HBA to D3 state.
 585          */
 586         ctl = readl(mmio + HOST_CTL);
 587         ctl &= ~HOST_IRQ_EN;
 588         writel(ctl, mmio + HOST_CTL);
 589         readl(mmio + HOST_CTL); /* flush */
 590
 591         rc = ata_host_suspend(host, PMSG_SUSPEND);
 592         if (rc)
 593                 return rc;
 594
 595         return 0;
 596 }
 597
 598 static int ahci_highbank_resume(struct device *dev)
 599 {
 600         struct ata_host *host = dev_get_drvdata(dev);
 601         int rc;
 602
 603         if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
 604                 rc = ahci_reset_controller(host);
 605                 if (rc)
 606                         return rc;
 607
 608                 ahci_init_controller(host);
 609         }
 610
 611         ata_host_resume(host);
 612
 613         return 0;
 614 }
 615 #endif
 616
 617 static SIMPLE_DEV_PM_OPS(ahci_highbank_pm_ops,
 618                   ahci_highbank_suspend, ahci_highbank_resume);
 619
 620 static struct platform_driver ahci_highbank_driver = {
 621         .remove = ata_platform_remove_one,
 622         .driver = {
 623                 .name = "highbank-ahci",
 624                 .of_match_table = ahci_of_match,
 625                 .pm = &ahci_highbank_pm_ops,
 626         },
 627         .probe = ahci_highbank_probe,
 628 };
 629
 630 module_platform_driver(ahci_highbank_driver);
 631
 632 MODULE_DESCRIPTION("Calxeda Highbank AHCI SATA platform driver");
 633 MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@calxeda.com>");
 634 MODULE_LICENSE("GPL");
 635 MODULE_ALIAS("sata:highbank");