ata/pata_buddha: Probe via modalias instead of initcall

Up until now, the pata_buddha driver would only check for cards on
initcall time. Now, the kernel will call its probe function as soon
as a compatible card is detected.

v7: Removed suppress_bind_attrs that slipped in

v6: Only do the drvdata workaround for X-Surf (remove breaks otherwise)
    Style

v5: Remove module_exit(): There's no good way to handle the X-Surf hack.
    Also include a workaround to save X-Surf's drvdata in case zorro8390
    is active.

v4: Clean up pata_buddha_probe() by using ent->driver_data.
    Support X-Surf via late_initcall()

v3: Clean up devm_*, implement device removal.

v2: Rename 'zdev' to 'z' to make the patch easy to analyse with
    git diff --ignore-space-change

Signed-off-by: Max Staudt <max@enpas.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 135 insertions, 93 deletions

diff --git a/drivers/ata/pata_buddha.c b/drivers/ata/pata_buddha.c
index 11a8044ff633..27d4c417fc60 100644
--- a/drivers/ata/pata_buddha.c
+++ b/drivers/ata/pata_buddha.c
@@ -18,7 +18,9 @@
 #include <linux/kernel.h>
 #include <linux/libata.h>
 #include <linux/mm.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
+#include <linux/types.h>
 #include <linux/zorro.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_host.h>
@@ -29,7 +31,7 @@
 #include <asm/setup.h>
 
 #define DRV_NAME "pata_buddha"
-#define DRV_VERSION "0.1.0"
+#define DRV_VERSION "0.1.1"
 
 #define BUDDHA_BASE1    0x800
 #define BUDDHA_BASE2    0xa00
@@ -47,11 +49,11 @@ enum {
         BOARD_XSURF
 };
 
-static unsigned int buddha_bases[3] __initdata = {
+static unsigned int buddha_bases[3] = {
         BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
 };
 
-static unsigned int xsurf_bases[2] __initdata = {
+static unsigned int xsurf_bases[2] = {
         XSURF_BASE1, XSURF_BASE2
 };
 
@@ -145,111 +147,151 @@ static struct ata_port_operations pata_xsurf_ops = {
         .set_mode       = pata_buddha_set_mode,
 };
 
-static int __init pata_buddha_init_one(void)
+static int pata_buddha_probe(struct zorro_dev *z,
+                             const struct zorro_device_id *ent)
 {
-        struct zorro_dev *z = NULL;
+        static const char * const board_name[] = {
+                "Buddha", "Catweasel", "X-Surf"
+        };
+        struct ata_host *host;
+        void __iomem *buddha_board;
+        unsigned long board;
+        unsigned int type = ent->driver_data;
+        unsigned int nr_ports = (type == BOARD_CATWEASEL) ? 3 : 2;
+        void *old_drvdata;
+        int i;
+
+        dev_info(&z->dev, "%s IDE controller\n", board_name[type]);
+
+        board = z->resource.start;
+
+        if (type != BOARD_XSURF) {
+                if (!devm_request_mem_region(&z->dev,
+                                             board + BUDDHA_BASE1,
+                                             0x800, DRV_NAME))
+                        return -ENXIO;
+        } else {
+                if (!devm_request_mem_region(&z->dev,
+                                             board + XSURF_BASE1,
+                                             0x1000, DRV_NAME))
+                        return -ENXIO;
+                if (!devm_request_mem_region(&z->dev,
+                                             board + XSURF_BASE2,
+                                             0x1000, DRV_NAME)) {
+                }
+        }
+
+        /* Workaround for X-Surf: Save drvdata in case zorro8390 has set it */
+        if (type == BOARD_XSURF)
+                old_drvdata = dev_get_drvdata(&z->dev);
+
+        /* allocate host */
+        host = ata_host_alloc(&z->dev, nr_ports);
+        if (type == BOARD_XSURF)
+                dev_set_drvdata(&z->dev, old_drvdata);
+        if (!host)
+                return -ENXIO;
+
+        buddha_board = ZTWO_VADDR(board);
+
+        /* enable the board IRQ on Buddha/Catweasel */
+        if (type != BOARD_XSURF)
+                z_writeb(0, buddha_board + BUDDHA_IRQ_MR);
 
-        while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
-                static const char *board_name[]
-                        = { "Buddha", "Catweasel", "X-Surf" };
-                struct ata_host *host;
-                void __iomem *buddha_board;
-                unsigned long board;
-                unsigned int type, nr_ports = 2;
-                int i;
-
-                if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
-                        type = BOARD_BUDDHA;
-                } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
-                        type = BOARD_CATWEASEL;
-                        nr_ports++;
-                } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
-                        type = BOARD_XSURF;
-                } else
-                        continue;
-
-                dev_info(&z->dev, "%s IDE controller\n", board_name[type]);
-
-                board = z->resource.start;
+        for (i = 0; i < nr_ports; i++) {
+                struct ata_port *ap = host->ports[i];
+                void __iomem *base, *irqport;
+                unsigned long ctl = 0;
 
                 if (type != BOARD_XSURF) {
-                        if (!devm_request_mem_region(&z->dev,
-                                                     board + BUDDHA_BASE1,
-                                                     0x800, DRV_NAME))
-                                continue;
+                        ap->ops = &pata_buddha_ops;
+                        base = buddha_board + buddha_bases[i];
+                        ctl = BUDDHA_CONTROL;
+                        irqport = buddha_board + BUDDHA_IRQ + i * 0x40;
                 } else {
-                        if (!devm_request_mem_region(&z->dev,
-                                                     board + XSURF_BASE1,
-                                                     0x1000, DRV_NAME))
-                                continue;
-                        if (!devm_request_mem_region(&z->dev,
-                                                     board + XSURF_BASE2,
-                                                     0x1000, DRV_NAME))
-                                continue;
+                        ap->ops = &pata_xsurf_ops;
+                        base = buddha_board + xsurf_bases[i];
+                        /* X-Surf has no CS1* (Control/AltStat) */
+                        irqport = buddha_board + XSURF_IRQ;
                 }
 
-                /* allocate host */
-                host = ata_host_alloc(&z->dev, nr_ports);
-                if (!host)
-                        continue;
-
-                buddha_board = ZTWO_VADDR(board);
-
-                /* enable the board IRQ on Buddha/Catweasel */
-                if (type != BOARD_XSURF)
-                        z_writeb(0, buddha_board + BUDDHA_IRQ_MR);
-
-                for (i = 0; i < nr_ports; i++) {
-                        struct ata_port *ap = host->ports[i];
-                        void __iomem *base, *irqport;
-                        unsigned long ctl = 0;
-
-                        if (type != BOARD_XSURF) {
-                                ap->ops = &pata_buddha_ops;
-                                base = buddha_board + buddha_bases[i];
-                                ctl = BUDDHA_CONTROL;
-                                irqport = buddha_board + BUDDHA_IRQ + i * 0x40;
-                        } else {
-                                ap->ops = &pata_xsurf_ops;
-                                base = buddha_board + xsurf_bases[i];
-                                /* X-Surf has no CS1* (Control/AltStat) */
-                                irqport = buddha_board + XSURF_IRQ;
-                        }
-
-                        ap->pio_mask = ATA_PIO4;
-                        ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
-
-                        ap->ioaddr.data_addr            = base;
-                        ap->ioaddr.error_addr           = base + 2 + 1 * 4;
-                        ap->ioaddr.feature_addr         = base + 2 + 1 * 4;
-                        ap->ioaddr.nsect_addr           = base + 2 + 2 * 4;
-                        ap->ioaddr.lbal_addr            = base + 2 + 3 * 4;
-                        ap->ioaddr.lbam_addr            = base + 2 + 4 * 4;
-                        ap->ioaddr.lbah_addr            = base + 2 + 5 * 4;
-                        ap->ioaddr.device_addr          = base + 2 + 6 * 4;
-                        ap->ioaddr.status_addr          = base + 2 + 7 * 4;
-                        ap->ioaddr.command_addr         = base + 2 + 7 * 4;
-
-                        if (ctl) {
-                                ap->ioaddr.altstatus_addr = base + ctl;
-                                ap->ioaddr.ctl_addr       = base + ctl;
-                        }
-
-                        ap->private_data = (void *)irqport;
-
-                        ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board,
-                                      ctl ? board + buddha_bases[i] + ctl : 0);
+                ap->pio_mask = ATA_PIO4;
+                ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
+
+                ap->ioaddr.data_addr            = base;
+                ap->ioaddr.error_addr           = base + 2 + 1 * 4;
+                ap->ioaddr.feature_addr         = base + 2 + 1 * 4;
+                ap->ioaddr.nsect_addr           = base + 2 + 2 * 4;
+                ap->ioaddr.lbal_addr            = base + 2 + 3 * 4;
+                ap->ioaddr.lbam_addr            = base + 2 + 4 * 4;
+                ap->ioaddr.lbah_addr            = base + 2 + 5 * 4;
+                ap->ioaddr.device_addr          = base + 2 + 6 * 4;
+                ap->ioaddr.status_addr          = base + 2 + 7 * 4;
+                ap->ioaddr.command_addr         = base + 2 + 7 * 4;
+
+                if (ctl) {
+                        ap->ioaddr.altstatus_addr = base + ctl;
+                        ap->ioaddr.ctl_addr       = base + ctl;
                 }
 
-                ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
-                                  IRQF_SHARED, &pata_buddha_sht);
+                ap->private_data = (void *)irqport;
 
+                ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board,
+                              ctl ? board + buddha_bases[i] + ctl : 0);
         }
 
+        ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt,
+                          IRQF_SHARED, &pata_buddha_sht);
+
         return 0;
 }
 
-module_init(pata_buddha_init_one);
+static void pata_buddha_remove(struct zorro_dev *z)
+{
+        struct ata_host *host = dev_get_drvdata(&z->dev);
+
+        ata_host_detach(host);
+}
+
+static const struct zorro_device_id pata_buddha_zorro_tbl[] = {
+        { ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA, BOARD_BUDDHA},
+        { ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL, BOARD_CATWEASEL},
+        { 0 }
+};
+MODULE_DEVICE_TABLE(zorro, pata_buddha_zorro_tbl);
+
+static struct zorro_driver pata_buddha_driver = {
+        .name           = "pata_buddha",
+        .id_table       = pata_buddha_zorro_tbl,
+        .probe          = pata_buddha_probe,
+        .remove         = pata_buddha_remove,
+};
+
+/*
+ * We cannot have a modalias for X-Surf boards, as it competes with the
+ * zorro8390 network driver. As a stopgap measure until we have proper
+ * MFD support for this board, we manually attach to it late after Zorro
+ * has enumerated its boards.
+ */
+static int __init pata_buddha_late_init(void)
+{
+        struct zorro_dev *z = NULL;
+
+        /* Auto-bind to regular boards */
+        zorro_register_driver(&pata_buddha_driver);
+
+        /* Manually bind to all X-Surf boards */
+        while ((z = zorro_find_device(ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, z))) {
+                static struct zorro_device_id xsurf_ent = {
+                        ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, BOARD_XSURF
+                };
+
+                pata_buddha_probe(z, &xsurf_ent);
+        }
+
+        return 0;
+}
+late_initcall(pata_buddha_late_init);
 
 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
 MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA");