ahci: Add platform driver

This can be used for AHCI-compatible interfaces implemented inside
System-On-Chip solutions, or AHCI devices connected via localbus.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

4 files changed, 229 insertions, 0 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 01c52c415bdc..cbadb9fa1277 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -65,6 +65,14 @@ config SATA_AHCI
 
           If unsure, say N.
 
+config SATA_AHCI_PLATFORM
+        tristate "Platform AHCI SATA support"
+        help
+          This option enables support for Platform AHCI Serial ATA
+          controllers.
+
+          If unsure, say N.
+
 config SATA_SIL24
         tristate "Silicon Image 3124/3132 SATA support"
         depends on PCI
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 20c5251e7e41..d0a93c4ad3ec 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -2,6 +2,7 @@
 obj-$(CONFIG_ATA)               += libata.o
 
 obj-$(CONFIG_SATA_AHCI)         += ahci.o libahci.o
+obj-$(CONFIG_SATA_AHCI_PLATFORM) += ahci_platform.o libahci.o
 obj-$(CONFIG_SATA_SVW)          += sata_svw.o
 obj-$(CONFIG_ATA_PIIX)          += ata_piix.o
 obj-$(CONFIG_SATA_PROMISE)      += sata_promise.o
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
new file mode 100644
index 000000000000..42cdd7363fad
--- /dev/null
+++ b/drivers/ata/ahci_platform.c
@@ -0,0 +1,191 @@
+/*
+ * AHCI SATA platform driver
+ *
+ * Copyright 2004-2005  Red Hat, Inc.
+ *   Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2010  MontaVista Software, LLC.
+ *   Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/libata.h>
+#include <linux/ahci_platform.h>
+#include "ahci.h"
+
+static int __init ahci_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct ahci_platform_data *pdata = dev->platform_data;
+        struct ata_port_info pi = {
+                .flags          = AHCI_FLAG_COMMON,
+                .pio_mask       = ATA_PIO4,
+                .udma_mask      = ATA_UDMA6,
+                .port_ops       = &ahci_ops,
+        };
+        const struct ata_port_info *ppi[] = { &pi, NULL };
+        struct ahci_host_priv *hpriv;
+        struct ata_host *host;
+        struct resource *mem;
+        int irq;
+        int n_ports;
+        int i;
+        int rc;
+
+        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem) {
+                dev_err(dev, "no mmio space\n");
+                return -EINVAL;
+        }
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq <= 0) {
+                dev_err(dev, "no irq\n");
+                return -EINVAL;
+        }
+
+        if (pdata && pdata->init) {
+                rc = pdata->init(dev);
+                if (rc)
+                        return rc;
+        }
+
+        if (pdata && pdata->ata_port_info)
+                pi = *pdata->ata_port_info;
+
+        hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
+        if (!hpriv) {
+                rc = -ENOMEM;
+                goto err0;
+        }
+
+        hpriv->flags |= (unsigned long)pi.private_data;
+
+        hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
+        if (!hpriv->mmio) {
+                dev_err(dev, "can't map %pR\n", mem);
+                rc = -ENOMEM;
+                goto err0;
+        }
+
+        ahci_save_initial_config(dev, hpriv,
+                pdata ? pdata->force_port_map : 0,
+                pdata ? pdata->mask_port_map  : 0);
+
+        /* prepare host */
+        if (hpriv->cap & HOST_CAP_NCQ)
+                pi.flags |= ATA_FLAG_NCQ;
+
+        if (hpriv->cap & HOST_CAP_PMP)
+                pi.flags |= ATA_FLAG_PMP;
+
+        ahci_set_em_messages(hpriv, &pi);
+
+        /* CAP.NP sometimes indicate the index of the last enabled
+         * port, at other times, that of the last possible port, so
+         * determining the maximum port number requires looking at
+         * both CAP.NP and port_map.
+         */
+        n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
+
+        host = ata_host_alloc_pinfo(dev, ppi, n_ports);
+        if (!host) {
+                rc = -ENOMEM;
+                goto err0;
+        }
+
+        host->private_data = hpriv;
+
+        if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
+                host->flags |= ATA_HOST_PARALLEL_SCAN;
+        else
+                printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
+
+        if (pi.flags & ATA_FLAG_EM)
+                ahci_reset_em(host);
+
+        for (i = 0; i < host->n_ports; i++) {
+                struct ata_port *ap = host->ports[i];
+
+                ata_port_desc(ap, "mmio %pR", mem);
+                ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
+
+                /* set initial link pm policy */
+                ap->pm_policy = NOT_AVAILABLE;
+
+                /* set enclosure management message type */
+                if (ap->flags & ATA_FLAG_EM)
+                        ap->em_message_type = ahci_em_messages;
+
+                /* disabled/not-implemented port */
+                if (!(hpriv->port_map & (1 << i)))
+                        ap->ops = &ata_dummy_port_ops;
+        }
+
+        rc = ahci_reset_controller(host);
+        if (rc)
+                goto err0;
+
+        ahci_init_controller(host);
+        ahci_print_info(host, "platform");
+
+        rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
+                               &ahci_sht);
+        if (rc)
+                goto err0;
+
+        return 0;
+err0:
+        if (pdata && pdata->exit)
+                pdata->exit(dev);
+        return rc;
+}
+
+static int __devexit ahci_remove(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct ahci_platform_data *pdata = dev->platform_data;
+        struct ata_host *host = dev_get_drvdata(dev);
+
+        ata_host_detach(host);
+
+        if (pdata && pdata->exit)
+                pdata->exit(dev);
+
+        return 0;
+}
+
+static struct platform_driver ahci_driver = {
+        .probe = ahci_probe,
+        .remove = __devexit_p(ahci_remove),
+        .driver = {
+                .name = "ahci",
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init ahci_init(void)
+{
+        return platform_driver_probe(&ahci_driver, ahci_probe);
+}
+module_init(ahci_init);
+
+static void __exit ahci_exit(void)
+{
+        platform_driver_unregister(&ahci_driver);
+}
+module_exit(ahci_exit);
+
+MODULE_DESCRIPTION("AHCI SATA platform driver");
+MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ahci");
diff --git a/include/linux/ahci_platform.h b/include/linux/ahci_platform.h
new file mode 100644
index 000000000000..f7dd576dd5a4
--- /dev/null
+++ b/include/linux/ahci_platform.h
@@ -0,0 +1,29 @@
+/*
+ * AHCI SATA platform driver
+ *
+ * Copyright 2004-2005  Red Hat, Inc.
+ *   Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2010  MontaVista Software, LLC.
+ *   Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ */
+
+#ifndef _AHCI_PLATFORM_H
+#define _AHCI_PLATFORM_H
+
+struct device;
+struct ata_port_info;
+
+struct ahci_platform_data {
+        int (*init)(struct device *dev);
+        void (*exit)(struct device *dev);
+        const struct ata_port_info *ata_port_info;
+        unsigned int force_port_map;
+        unsigned int mask_port_map;
+};
+
+#endif /* _AHCI_PLATFORM_H */