pata_it821x: Driver updates and reworking

- Add support for the RDC 1010 variant
- Rework the core library to have a read_id method. This allows the hacky
  bits of it821x to go and prepares us for pata_hd
- Switch from WARN to BUG in ata_id_string as it will reboot if you get
  it wrong so WARN won't be seen
- Allow the issue of command 0xFC on the 821x. This is needed to query
  rebuild status.
- Tidy up printk formatting
- Do more ident rewriting on RAID volumes to handle firmware provided
  ident data which is rather wonky
- Report the firmware revision and device layout in RAID mode
- Don't try and disable raid on the 8211 or RDC - they don't have the
  relevant bits

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

3 files changed, 265 insertions, 39 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f69d1548b562..5ba96c5052c8 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1132,6 +1132,8 @@ void ata_id_string(const u16 *id, unsigned char *s,
 {
         unsigned int c;
 
+        BUG_ON(len & 1);
+
         while (len > 0) {
                 c = id[ofs] >> 8;
                 *s = c;
@@ -1165,8 +1167,6 @@ void ata_id_c_string(const u16 *id, unsigned char *s,
 {
         unsigned char *p;
 
-        WARN_ON(!(len & 1));
-
         ata_id_string(id, s, ofs, len - 1);
 
         p = s + strnlen(s, len - 1);
@@ -1886,6 +1886,23 @@ static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
 }
 
 /**
+ *      ata_do_dev_read_id              -       default ID read method
+ *      @dev: device
+ *      @tf: proposed taskfile
+ *      @id: data buffer
+ *
+ *      Issue the identify taskfile and hand back the buffer containing
+ *      identify data. For some RAID controllers and for pre ATA devices
+ *      this function is wrapped or replaced by the driver
+ */
+unsigned int ata_do_dev_read_id(struct ata_device *dev,
+                                        struct ata_taskfile *tf, u16 *id)
+{
+        return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
+                                     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
+}
+
+/**
  *      ata_dev_read_id - Read ID data from the specified device
  *      @dev: target device
  *      @p_class: pointer to class of the target device (may be changed)
@@ -1920,7 +1937,7 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
         if (ata_msg_ctl(ap))
                 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
 
- retry:
+retry:
         ata_tf_init(dev, &tf);
 
         switch (class) {
@@ -1948,8 +1965,11 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
          */
         tf.flags |= ATA_TFLAG_POLLING;
 
-        err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
-                                     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
+        if (ap->ops->read_id)
+                err_mask = ap->ops->read_id(dev, &tf, id);
+        else
+                err_mask = ata_do_dev_read_id(dev, &tf, id);
+
         if (err_mask) {
                 if (err_mask & AC_ERR_NODEV_HINT) {
                         ata_dev_printk(dev, KERN_DEBUG,
@@ -6283,6 +6303,7 @@ EXPORT_SYMBOL_GPL(ata_host_resume);
 #endif /* CONFIG_PM */
 EXPORT_SYMBOL_GPL(ata_id_string);
 EXPORT_SYMBOL_GPL(ata_id_c_string);
+EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
 
 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
diff --git a/drivers/ata/pata_it821x.c b/drivers/ata/pata_it821x.c
index e10816931b2f..27843c70eb9d 100644
--- a/drivers/ata/pata_it821x.c
+++ b/drivers/ata/pata_it821x.c
@@ -80,7 +80,7 @@
 
 
 #define DRV_NAME "pata_it821x"
-#define DRV_VERSION "0.3.8"
+#define DRV_VERSION "0.4.0"
 
 struct it821x_dev
 {
@@ -425,6 +425,8 @@ static unsigned int it821x_smart_qc_issue(struct ata_queued_cmd *qc)
                 case ATA_CMD_WRITE_MULTI:
                 case ATA_CMD_WRITE_MULTI_EXT:
                 case ATA_CMD_ID_ATA:
+                case ATA_CMD_INIT_DEV_PARAMS:
+                case 0xFC:      /* Internal 'report rebuild state' */
                 /* Arguably should just no-op this one */
                 case ATA_CMD_SET_FEATURES:
                         return ata_sff_qc_issue(qc);
@@ -509,7 +511,7 @@ static void it821x_dev_config(struct ata_device *adev)
 
         if (strstr(model_num, "Integrated Technology Express")) {
                 /* RAID mode */
-                printk(KERN_INFO "IT821x %sRAID%d volume",
+                ata_dev_printk(adev, KERN_INFO, "%sRAID%d volume",
                         adev->id[147]?"Bootable ":"",
                         adev->id[129]);
                 if (adev->id[129] != 1)
@@ -519,37 +521,51 @@ static void it821x_dev_config(struct ata_device *adev)
         /* This is a controller firmware triggered funny, don't
            report the drive faulty! */
         adev->horkage &= ~ATA_HORKAGE_DIAGNOSTIC;
+        /* No HPA in 'smart' mode */
+        adev->horkage |= ATA_HORKAGE_BROKEN_HPA;
 }
 
 /**
- *      it821x_ident_hack       -       Hack identify data up
- *      @ap: Port
+ *      it821x_read_id  -       Hack identify data up
+ *      @adev: device to read
+ *      @tf: proposed taskfile
+ *      @id: buffer for returned ident data
  *
- *      Walk the devices on this firmware driven port and slightly
+ *      Query the devices on this firmware driven port and slightly
  *      mash the identify data to stop us and common tools trying to
  *      use features not firmware supported. The firmware itself does
  *      some masking (eg SMART) but not enough.
- *
- *      This is a bit of an abuse of the cable method, but it is the
- *      only method called at the right time. We could modify the libata
- *      core specifically for ident hacking but while we have one offender
- *      it seems better to keep the fallout localised.
  */
 
-static int it821x_ident_hack(struct ata_port *ap)
+static unsigned int it821x_read_id(struct ata_device *adev,
+                                        struct ata_taskfile *tf, u16 *id)
 {
-        struct ata_device *adev;
-        ata_link_for_each_dev(adev, &ap->link) {
-                if (ata_dev_enabled(adev)) {
-                        adev->id[84] &= ~(1 << 6);      /* No FUA */
-                        adev->id[85] &= ~(1 << 10);     /* No HPA */
-                        adev->id[76] = 0;               /* No NCQ/AN etc */
-                }
+        unsigned int err_mask;
+        unsigned char model_num[ATA_ID_PROD_LEN + 1];
+
+        err_mask = ata_do_dev_read_id(adev, tf, id);
+        if (err_mask)
+                return err_mask;
+        ata_id_c_string(id, model_num, ATA_ID_PROD, sizeof(model_num));
+
+        id[83] &= ~(1 << 12);   /* Cache flush is firmware handled */
+        id[83] &= ~(1 << 13);   /* Ditto for LBA48 flushes */
+        id[84] &= ~(1 << 6);    /* No FUA */
+        id[85] &= ~(1 << 10);   /* No HPA */
+        id[76] = 0;             /* No NCQ/AN etc */
+
+        if (strstr(model_num, "Integrated Technology Express")) {
+                /* Set feature bits the firmware neglects */
+                id[49] |= 0x0300;       /* LBA, DMA */
+                id[82] |= 0x0400;       /* LBA48 */
+                id[83] &= 0x7FFF;
+                id[83] |= 0x4000;       /* Word 83 is valid */
+                id[86] |= 0x0400;       /* LBA48 on */
+                id[ATA_ID_MAJOR_VER] |= 0x1F;
         }
-        return ata_cable_unknown(ap);
+        return err_mask;
 }
 
-
 /**
  *      it821x_check_atapi_dma  -       ATAPI DMA handler
  *      @qc: Command we are about to issue
@@ -577,6 +593,136 @@ static int it821x_check_atapi_dma(struct ata_queued_cmd *qc)
         return 0;
 }
 
+/**
+ *      it821x_display_disk     -       display disk setup
+ *      @n: Device number
+ *      @buf: Buffer block from firmware
+ *
+ *      Produce a nice informative display of the device setup as provided
+ *      by the firmware.
+ */
+
+static void it821x_display_disk(int n, u8 *buf)
+{
+        unsigned char id[41];
+        int mode = 0;
+        char *mtype;
+        char mbuf[8];
+        char *cbl = "(40 wire cable)";
+
+        static const char *types[5] = {
+                "RAID0", "RAID1" "RAID 0+1", "JBOD", "DISK"
+        };
+
+        if (buf[52] > 4)        /* No Disk */
+                return;
+
+        ata_id_c_string((u16 *)buf, id, 0, 41); 
+
+        if (buf[51]) {
+                mode = ffs(buf[51]);
+                mtype = "UDMA";
+        } else if (buf[49]) {
+                mode = ffs(buf[49]);
+                mtype = "MWDMA";
+        }
+
+        if (buf[76])
+                cbl = "";
+
+        if (mode)
+                snprintf(mbuf, 8, "%5s%d", mtype, mode - 1);
+        else
+                strcpy(mbuf, "PIO");
+        if (buf[52] == 4)
+                printk(KERN_INFO "%d: %-6s %-8s          %s %s\n",
+                                n, mbuf, types[buf[52]], id, cbl);
+        else
+                printk(KERN_INFO "%d: %-6s %-8s Volume: %1d %s %s\n",
+                                n, mbuf, types[buf[52]], buf[53], id, cbl);
+        if (buf[125] < 100)
+                printk(KERN_INFO "%d: Rebuilding: %d%%\n", n, buf[125]);
+}
+
+/**
+ *      it821x_firmware_command         -       issue firmware command
+ *      @ap: IT821x port to interrogate
+ *      @cmd: command
+ *      @len: length
+ *
+ *      Issue firmware commands expecting data back from the controller. We
+ *      use this to issue commands that do not go via the normal paths. Other
+ *      commands such as 0xFC can be issued normally.
+ */
+
+static u8 *it821x_firmware_command(struct ata_port *ap, u8 cmd, int len)
+{
+        u8 status;
+        int n = 0;
+        u16 *buf = kmalloc(len, GFP_KERNEL);
+        if (buf == NULL) {
+                printk(KERN_ERR "it821x_firmware_command: Out of memory\n");
+                return NULL;
+        }
+        /* This isn't quite a normal ATA command as we are talking to the
+           firmware not the drives */
+        ap->ctl |= ATA_NIEN;
+        iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
+        ata_wait_idle(ap);
+        iowrite8(ATA_DEVICE_OBS, ap->ioaddr.device_addr);
+        iowrite8(cmd, ap->ioaddr.command_addr);
+        udelay(1);
+        /* This should be almost immediate but a little paranoia goes a long
+           way. */
+        while(n++ < 10) {
+                status = ioread8(ap->ioaddr.status_addr);
+                if (status & ATA_ERR) {
+                        kfree(buf);
+                        printk(KERN_ERR "it821x_firmware_command: rejected\n");
+                        return NULL;
+                }
+                if (status & ATA_DRQ) {
+                        ioread16_rep(ap->ioaddr.data_addr, buf, len/2);
+                        return (u8 *)buf;
+                }
+                mdelay(1);
+        }
+        kfree(buf);
+        printk(KERN_ERR "it821x_firmware_command: timeout\n");
+        return NULL;
+}
+
+/**
+ *      it821x_probe_firmware   -       firmware reporting/setup
+ *      @ap: IT821x port being probed
+ *
+ *      Probe the firmware of the controller by issuing firmware command
+ *      0xFA and analysing the returned data.
+ */
+
+static void it821x_probe_firmware(struct ata_port *ap)
+{
+        u8 *buf;
+        int i;
+
+        /* This is a bit ugly as we can't just issue a task file to a device
+           as this is controller magic */
+
+        buf = it821x_firmware_command(ap, 0xFA, 512);
+
+        if (buf != NULL) {
+                printk(KERN_INFO "pata_it821x: Firmware %02X/%02X/%02X%02X\n",
+                                buf[505],
+                                buf[506],
+                                buf[507],
+                                buf[508]);
+                for (i = 0; i < 4; i++)
+                        it821x_display_disk(i, buf + 128 * i);
+                kfree(buf);
+        }
+}
+
+
 
 /**
  *      it821x_port_start       -       port setup
@@ -610,6 +756,8 @@ static int it821x_port_start(struct ata_port *ap)
                 /* Long I/O's although allowed in LBA48 space cause the
                    onboard firmware to enter the twighlight zone */
                 /* No ATAPI DMA in this mode either */
+                if (ap->port_no == 0)
+                        it821x_probe_firmware(ap);
         }
         /* Pull the current clocks from 0x50 */
         if (conf & (1 << (1 + ap->port_no)))
@@ -631,6 +779,25 @@ static int it821x_port_start(struct ata_port *ap)
         return 0;
 }
 
+/**
+ *      it821x_rdc_cable        -       Cable detect for RDC1010
+ *      @ap: port we are checking
+ *
+ *      Return the RDC1010 cable type. Unlike the IT821x we know how to do
+ *      this and can do host side cable detect
+ */
+
+static int it821x_rdc_cable(struct ata_port *ap)
+{
+        u16 r40;
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+
+        pci_read_config_word(pdev, 0x40, &r40);
+        if (r40 & (1 << (2 + ap->port_no)))
+                return ATA_CBL_PATA40;
+        return ATA_CBL_PATA80;
+}
+
 static struct scsi_host_template it821x_sht = {
         ATA_BMDMA_SHT(DRV_NAME),
 };
@@ -641,9 +808,10 @@ static struct ata_port_operations it821x_smart_port_ops = {
         .check_atapi_dma= it821x_check_atapi_dma,
         .qc_issue       = it821x_smart_qc_issue,
 
-        .cable_detect   = it821x_ident_hack,
+        .cable_detect   = ata_cable_80wire,
         .set_mode       = it821x_smart_set_mode,
         .dev_config     = it821x_dev_config,
+        .read_id        = it821x_read_id,
 
         .port_start     = it821x_port_start,
 };
@@ -664,8 +832,29 @@ static struct ata_port_operations it821x_passthru_port_ops = {
         .port_start     = it821x_port_start,
 };
 
+static struct ata_port_operations it821x_rdc_port_ops = {
+        .inherits       = &ata_bmdma_port_ops,
+
+        .check_atapi_dma= it821x_check_atapi_dma,
+        .sff_dev_select = it821x_passthru_dev_select,
+        .bmdma_start    = it821x_passthru_bmdma_start,
+        .bmdma_stop     = it821x_passthru_bmdma_stop,
+        .qc_issue       = it821x_passthru_qc_issue,
+
+        .cable_detect   = it821x_rdc_cable,
+        .set_piomode    = it821x_passthru_set_piomode,
+        .set_dmamode    = it821x_passthru_set_dmamode,
+
+        .port_start     = it821x_port_start,
+};
+
 static void it821x_disable_raid(struct pci_dev *pdev)
 {
+        /* Neither the RDC nor the IT8211 */
+        if (pdev->vendor != PCI_VENDOR_ID_ITE ||
+                        pdev->device != PCI_DEVICE_ID_ITE_8212)
+                        return;
+
         /* Reset local CPU, and set BIOS not ready */
         pci_write_config_byte(pdev, 0x5E, 0x01);
 
@@ -690,6 +879,7 @@ static int it821x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
                 .flags = ATA_FLAG_SLAVE_POSS,
                 .pio_mask = 0x1f,
                 .mwdma_mask = 0x07,
+                .udma_mask = ATA_UDMA6,
                 .port_ops = &it821x_smart_port_ops
         };
         static const struct ata_port_info info_passthru = {
@@ -699,6 +889,13 @@ static int it821x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
                 .udma_mask = ATA_UDMA6,
                 .port_ops = &it821x_passthru_port_ops
         };
+        static const struct ata_port_info info_rdc = {
+                .flags = ATA_FLAG_SLAVE_POSS,
+                .pio_mask = 0x1f,
+                .mwdma_mask = 0x07,
+                /* No UDMA */
+                .port_ops = &it821x_rdc_port_ops
+        };
 
         const struct ata_port_info *ppi[] = { NULL, NULL };
         static char *mode[2] = { "pass through", "smart" };
@@ -707,21 +904,25 @@ static int it821x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
         rc = pcim_enable_device(pdev);
         if (rc)
                 return rc;
+                
+        if (pdev->vendor == PCI_VENDOR_ID_RDC) {
+                ppi[0] = &info_rdc;
+        } else {
+                /* Force the card into bypass mode if so requested */
+                if (it8212_noraid) {
+                        printk(KERN_INFO DRV_NAME ": forcing bypass mode.\n");
+                        it821x_disable_raid(pdev);
+                }
+                pci_read_config_byte(pdev, 0x50, &conf);
+                conf &= 1;
 
-        /* Force the card into bypass mode if so requested */
-        if (it8212_noraid) {
-                printk(KERN_INFO DRV_NAME ": forcing bypass mode.\n");
-                it821x_disable_raid(pdev);
+                printk(KERN_INFO DRV_NAME": controller in %s mode.\n",
+                                                                mode[conf]);
+                if (conf == 0)
+                        ppi[0] = &info_passthru;
+                else
+                        ppi[0] = &info_smart;
         }
-        pci_read_config_byte(pdev, 0x50, &conf);
-        conf &= 1;
-
-        printk(KERN_INFO DRV_NAME ": controller in %s mode.\n", mode[conf]);
-        if (conf == 0)
-                ppi[0] = &info_passthru;
-        else
-                ppi[0] = &info_smart;
-
         return ata_pci_sff_init_one(pdev, ppi, &it821x_sht, NULL);
 }
 
@@ -745,6 +946,7 @@ static int it821x_reinit_one(struct pci_dev *pdev)
 static const struct pci_device_id it821x[] = {
         { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8211), },
         { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8212), },
+        { PCI_VDEVICE(RDC, 0x1010), },
 
         { },
 };
diff --git a/include/linux/libata.h b/include/linux/libata.h
index d4b8e5fa3e8b..06b80337303b 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -750,6 +750,7 @@ struct ata_port_operations {
         void (*set_piomode)(struct ata_port *ap, struct ata_device *dev);
         void (*set_dmamode)(struct ata_port *ap, struct ata_device *dev);
         int  (*set_mode)(struct ata_link *link, struct ata_device **r_failed_dev);
+        unsigned int (*read_id)(struct ata_device *dev, struct ata_taskfile *tf, u16 *id);
 
         void (*dev_config)(struct ata_device *dev);
 
@@ -951,6 +952,8 @@ extern void ata_id_string(const u16 *id, unsigned char *s,
                           unsigned int ofs, unsigned int len);
 extern void ata_id_c_string(const u16 *id, unsigned char *s,
                             unsigned int ofs, unsigned int len);
+extern unsigned int ata_do_dev_read_id(struct ata_device *dev,
+                                        struct ata_taskfile *tf, u16 *id);
 extern void ata_qc_complete(struct ata_queued_cmd *qc);
 extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active);
 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,