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Subject[PATCH v6] ata/pata_buddha: Probe via modalias instead of initcall
Date
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.

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>
---
drivers/ata/pata_buddha.c | 231 +++++++++++++++++++++++++++-------------------
1 file changed, 138 insertions(+), 93 deletions(-)

diff --git a/drivers/ata/pata_buddha.c b/drivers/ata/pata_buddha.c
index 11a8044ff..9e1b57866 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 +147,154 @@ 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,
+ .driver = {
+ .suppress_bind_attrs = true,
+ },
+};
+
+/*
+ * 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");
--
2.11.0
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