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Message-ID: <01cfe282-6ce6-ff40-9e85-e23724f9d50f@samsung.com>
Date: Thu, 25 Jul 2019 19:03:57 +0200
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To: Max Staudt <max@...as.org>
Cc: linux-ide@...r.kernel.org, linux-m68k@...r.kernel.org,
linux-kernel@...r.kernel.org,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
Michael Schmitz <schmitzmic@...il.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v2] ata/pata_buddha: Probe via modalias instead of
initcall
Hi Max,
On 7/25/19 12:22 PM, Max Staudt wrote:
> 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.
>
> Device removal remains unimplemented. A WARN_ONCE() serves as a
> reminder.
>
> v2: Rename 'zdev' to 'z' to make the patch easy to analyse with
> git diff --ignore-space-change
>
> Tested-by: Max Staudt <max@...as.org>
> Signed-off-by: Max Staudt <max@...as.org>
> ---
> drivers/ata/pata_buddha.c | 240 ++++++++++++++++++++++++++++------------------
> 1 file changed, 146 insertions(+), 94 deletions(-)
>
> diff --git a/drivers/ata/pata_buddha.c b/drivers/ata/pata_buddha.c
> index 11a8044ff..76804a4c1 100644
> --- a/drivers/ata/pata_buddha.c
> +++ b/drivers/ata/pata_buddha.c
> @@ -19,6 +19,7 @@
> #include <linux/libata.h>
> #include <linux/mm.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 +30,7 @@
> #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 +48,11 @@ 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 +146,162 @@ 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;
> -
> - 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;
> + static const char * const 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;
> +
> + switch (z->id) {
> + case ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA:
> + default:
> + type = BOARD_BUDDHA;
> + break;
> + case ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL:
> + type = BOARD_CATWEASEL;
> + nr_ports++;
> + break;
> + case ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF:
> + type = BOARD_XSURF;
> + break;
> + }
> +
> + 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)) {
> + devm_release_mem_region(&z->dev,
> + board + XSURF_BASE1,
> + 0x1000);
> + return -ENXIO;
> + }
> + }
> +
> + /* allocate host */
> + host = ata_host_alloc(&z->dev, nr_ports);
> + if (!host)
> + goto err_ata_host_alloc;
> +
> + 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) {
> - 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;
> +
> +err_ata_host_alloc:
> + switch (type) {
> + case BOARD_BUDDHA:
> + case BOARD_CATWEASEL:
> + default:
> + devm_release_mem_region(&z->dev,
> + board + BUDDHA_BASE1,
> + 0x800);
Could you please explain why this is needed now?
[ The whole idea of using devm_* helpers is to not have to release
resources explicitly. ]
> + break;
> + case BOARD_XSURF:
> + devm_release_mem_region(&z->dev,
> + board + XSURF_BASE1,
> + 0x1000);
> + devm_release_mem_region(&z->dev,
> + board + XSURF_BASE2,
> + 0x1000);
> + break;
> + }
> +
> + return -ENXIO;
> +}
> +
> +static void pata_buddha_remove(struct zorro_dev *zdev)
> +{
> + /* NOT IMPLEMENTED */
> +
> + WARN_ONCE(1, "pata_buddha: Attempted to remove driver. This is not implemented yet.\n");
Please try to implement it, should be as simple as:
static void pata_buddha_remove(struct zorro_dev *zdev)
{
struct ata_host *host = dev_get_drvdata(&zdev->dev);
ata_host_detach(host);
}
[ ata_host_alloc() in pata_buddha_probe() sets drvdata to host ]
The rest of the patch looks fine, thanks for working on this driver.
> }
>
> -module_init(pata_buddha_init_one);
> +static const struct zorro_device_id pata_buddha_zorro_tbl[] = {
> + { ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA, },
> + { ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL, },
> + { ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, },
> + { 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,
> +};
> +
> +module_driver(pata_buddha_driver,
> + zorro_register_driver,
> + zorro_unregister_driver);
>
> MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
> MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA");
PS Next time please also use scripts/get_maintainer.pl script to get
the list of people that should be added to Cc:, i.e.:
$ ./scripts/get_maintainer.pl -f drivers/ata/pata_buddha.c
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com> (maintainer:LIBATA PATA DRIVERS)
Jens Axboe <axboe@...nel.dk> (maintainer:LIBATA PATA DRIVERS)
linux-ide@...r.kernel.org (open list:LIBATA PATA DRIVERS)
linux-kernel@...r.kernel.org (open list)
[ I've also added John, Michael & Geert to Cc: (as they were all
involved in the development of the initial driver version). ]
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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