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Date: Thu, 29 Sep 2016 08:57:59 +1000 (AEST)
From: Finn Thain <fthain@...egraphics.com.au>
To: Ondrej Zary <linux@...nbow-software.org>
cc: Christoph Hellwig <hch@...radead.org>, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] g_NCR5380: Stop using scsi_module.c
Acked-by: Finn Thain <fthain@...egraphics.com.au>
On Tue, 27 Sep 2016, Ondrej Zary wrote:
> Convert g_NCR5380 to use scsi_add_host instead of scsi_module.c
> Use pnp_driver and isa_driver to manage cards.
>
> In order to support multiple cards, new module parameter format is
> introduced. The old parameters are kept for compatibility.
>
> Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
> ---
> Documentation/scsi/g_NCR5380.txt | 24 ++-
> drivers/scsi/g_NCR5380.c | 335 ++++++++++++++++++++++----------------
> drivers/scsi/g_NCR5380.h | 8 -
> 3 files changed, 215 insertions(+), 152 deletions(-)
>
> diff --git a/Documentation/scsi/g_NCR5380.txt b/Documentation/scsi/g_NCR5380.txt
> index 843cbae..e2c1879 100644
> --- a/Documentation/scsi/g_NCR5380.txt
> +++ b/Documentation/scsi/g_NCR5380.txt
> @@ -28,6 +28,16 @@ time. More info to come in the future.
> This driver works as a module.
> When included as a module, parameters can be passed on the insmod/modprobe
> command line:
> + irq=xx[,...] the interrupt(s)
> + base=xx[,...] the port or base address(es) (for port or memory mapped, resp.)
> + card=xx[,...] card type(s):
> + 0 = NCR5380,
> + 1 = NCR53C400,
> + 2 = NCR53C400A,
> + 3 = Domex Technology Corp 3181E (DTC3181E)
> + 4 = Hewlett Packard C2502
> +
> +These old-style parameters can support only one card:
> ncr_irq=xx the interrupt
> ncr_addr=xx the port or base address (for port or memory
> mapped, resp.)
> @@ -36,11 +46,19 @@ command line:
> ncr_53c400a=1 to set up for a NCR53C400A board
> dtc_3181e=1 to set up for a Domex Technology Corp 3181E board
> hp_c2502=1 to set up for a Hewlett Packard C2502 board
> +
> e.g.
> -modprobe g_NCR5380 ncr_irq=5 ncr_addr=0x350 ncr_5380=1
> +OLD: modprobe g_NCR5380 ncr_irq=5 ncr_addr=0x350 ncr_5380=1
> +NEW: modprobe g_NCR5380 irq=5 base=0x350 card=0
> for a port mapped NCR5380 board or
> -modprobe g_NCR5380 ncr_irq=255 ncr_addr=0xc8000 ncr_53c400=1
> - for a memory mapped NCR53C400 board with interrupts disabled.
> +
> +OLD: modprobe g_NCR5380 ncr_irq=255 ncr_addr=0xc8000 ncr_53c400=1
> +NEW: modprobe g_NCR5380 irq=255 base=0xc8000 card=1
> + for a memory mapped NCR53C400 board with interrupts disabled or
> +
> +NEW: modprobe g_NCR5380 irq=0,7 base=0x240,0x300 card=3,4
> + for two cards: DTC3181 (in non-PnP mode) at 0x240 with no IRQ
> + and HP C2502 at 0x300 with IRQ 7
>
> (255 should be specified for no or DMA interrupt, 254 to autoprobe for an
> IRQ line if overridden on the command line.)
> diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
> index 5162de6..cbf0103 100644
> --- a/drivers/scsi/g_NCR5380.c
> +++ b/drivers/scsi/g_NCR5380.c
> @@ -30,24 +30,41 @@
> #include "NCR5380.h"
> #include <linux/init.h>
> #include <linux/ioport.h>
> -#include <linux/isapnp.h>
> +#include <linux/isa.h>
> +#include <linux/pnp.h>
> #include <linux/interrupt.h>
>
> +#define MAX_CARDS 8
> +
> +/* old-style parameters for compatibility */
> static int ncr_irq;
> -static int ncr_dma;
> static int ncr_addr;
> static int ncr_5380;
> static int ncr_53c400;
> static int ncr_53c400a;
> static int dtc_3181e;
> static int hp_c2502;
> +module_param(ncr_irq, int, 0);
> +module_param(ncr_addr, int, 0);
> +module_param(ncr_5380, int, 0);
> +module_param(ncr_53c400, int, 0);
> +module_param(ncr_53c400a, int, 0);
> +module_param(dtc_3181e, int, 0);
> +module_param(hp_c2502, int, 0);
> +
> +static int irq[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
> +module_param_array(irq, int, NULL, 0);
> +MODULE_PARM_DESC(irq, "IRQ number(s)");
>
> -static struct card {
> - NCR5380_map_type NCR5380_map_name;
> - int irq;
> - int dma;
> - int board; /* Use NCR53c400, Ricoh, etc. extensions ? */
> -} card;
> +static int base[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
> +module_param_array(base, int, NULL, 0);
> +MODULE_PARM_DESC(base, "base address(es)");
> +
> +static int card[] = { -1, -1, -1, -1, -1, -1, -1, -1 };
> +module_param_array(card, int, NULL, 0);
> +MODULE_PARM_DESC(card, "card type (0=NCR5380, 1=NCR53C400, 2=NCR53C400A, 3=DTC3181E, 4=HP C2502)");
> +
> +MODULE_LICENSE("GPL");
>
> #ifndef SCSI_G_NCR5380_MEM
> /*
> @@ -73,17 +90,8 @@ static void magic_configure(int idx, u8 irq, u8 magic[])
> }
> #endif
>
> -/**
> - * generic_NCR5380_detect - look for NCR5380 controllers
> - * @tpnt: the scsi template
> - *
> - * Scan for the present of NCR5380, NCR53C400, NCR53C400A, DTC3181E
> - * and DTC436(ISAPnP) controllers.
> - *
> - * Locks: none
> - */
> -
> -static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
> +static int generic_NCR5380_init_one(struct scsi_host_template *tpnt,
> + struct device *pdev, int base, int irq, int board)
> {
> unsigned int *ports;
> u8 *magic = NULL;
> @@ -92,80 +100,29 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
> int port_idx = -1;
> unsigned long region_size;
> #endif
> - static unsigned int __initdata ncr_53c400a_ports[] = {
> + static unsigned int ncr_53c400a_ports[] = {
> 0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0
> };
> - static unsigned int __initdata dtc_3181e_ports[] = {
> + static unsigned int dtc_3181e_ports[] = {
> 0x220, 0x240, 0x280, 0x2a0, 0x2c0, 0x300, 0x320, 0x340, 0
> };
> - static u8 ncr_53c400a_magic[] __initdata = { /* 53C400A & DTC436 */
> + static u8 ncr_53c400a_magic[] = { /* 53C400A & DTC436 */
> 0x59, 0xb9, 0xc5, 0xae, 0xa6
> };
> - static u8 hp_c2502_magic[] __initdata = { /* HP C2502 */
> + static u8 hp_c2502_magic[] = { /* HP C2502 */
> 0x0f, 0x22, 0xf0, 0x20, 0x80
> };
> - int flags;
> + int flags, ret;
> struct Scsi_Host *instance;
> struct NCR5380_hostdata *hostdata;
> #ifdef SCSI_G_NCR5380_MEM
> - unsigned long base;
> void __iomem *iomem;
> resource_size_t iomem_size;
> #endif
>
> - if (ncr_irq)
> - card.irq = ncr_irq;
> - if (ncr_dma)
> - card.dma = ncr_dma;
> - if (ncr_addr)
> - card.NCR5380_map_name = (NCR5380_map_type) ncr_addr;
> - if (ncr_5380)
> - card.board = BOARD_NCR5380;
> - else if (ncr_53c400)
> - card.board = BOARD_NCR53C400;
> - else if (ncr_53c400a)
> - card.board = BOARD_NCR53C400A;
> - else if (dtc_3181e)
> - card.board = BOARD_DTC3181E;
> - else if (hp_c2502)
> - card.board = BOARD_HP_C2502;
> -#ifndef SCSI_G_NCR5380_MEM
> - if (isapnp_present()) {
> - struct pnp_dev *dev = NULL;
> - while ((dev = pnp_find_dev(NULL, ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e), dev))) {
> - if (pnp_device_attach(dev) < 0)
> - continue;
> - if (pnp_activate_dev(dev) < 0) {
> - printk(KERN_ERR "dtc436e probe: activate failed\n");
> - pnp_device_detach(dev);
> - continue;
> - }
> - if (!pnp_port_valid(dev, 0)) {
> - printk(KERN_ERR "dtc436e probe: no valid port\n");
> - pnp_device_detach(dev);
> - continue;
> - }
> - if (pnp_irq_valid(dev, 0))
> - card.irq = pnp_irq(dev, 0);
> - else
> - card.irq = NO_IRQ;
> - if (pnp_dma_valid(dev, 0))
> - card.dma = pnp_dma(dev, 0);
> - else
> - card.dma = DMA_NONE;
> - card.NCR5380_map_name = (NCR5380_map_type) pnp_port_start(dev, 0);
> - card.board = BOARD_DTC3181E;
> - break;
> - }
> - }
> -#endif
> -
> - if (!(card.NCR5380_map_name))
> - return 0;
> -
> ports = NULL;
> flags = 0;
> - switch (card.board) {
> + switch (board) {
> case BOARD_NCR5380:
> flags = FLAG_NO_PSEUDO_DMA | FLAG_DMA_FIXUP;
> break;
> @@ -191,17 +148,20 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
> magic_configure(-1, 0, magic);
>
> region_size = 16;
> -
> - if (card.NCR5380_map_name != PORT_AUTO)
> + if (base)
> for (i = 0; ports[i]; i++) {
> - if (!request_region(ports[i], region_size, "ncr53c80"))
> - continue;
> - if (card.NCR5380_map_name == ports[i])
> + if (base == ports[i]) { /* index found */
> + if (!request_region(ports[i],
> + region_size,
> + "ncr53c80"))
> + return -EBUSY;
> break;
> - release_region(ports[i], region_size);
> - } else
> + }
> + }
> + else
> for (i = 0; ports[i]; i++) {
> - if (!request_region(ports[i], region_size, "ncr53c80"))
> + if (!request_region(ports[i], region_size,
> + "ncr53c80"))
> continue;
> if (inb(ports[i]) == 0xff)
> break;
> @@ -211,39 +171,41 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
> /* At this point we have our region reserved */
> magic_configure(i, 0, magic); /* no IRQ yet */
> outb(0xc0, ports[i] + 9);
> - if (inb(ports[i] + 9) != 0x80)
> - return 0;
> - card.NCR5380_map_name = ports[i];
> + if (inb(ports[i] + 9) != 0x80) {
> + ret = -ENODEV;
> + goto out_release;
> + }
> + base = ports[i];
> port_idx = i;
> } else
> - return 0;
> + return -EINVAL;
> }
> else
> {
> - /* Not a 53C400A style setup - just grab */
> + /* NCR5380 - no configuration, just grab */
> region_size = 8;
> - if (!request_region(card.NCR5380_map_name,
> - region_size, "ncr5380"))
> - return 0;
> + if (!base || !request_region(base, region_size, "ncr5380"))
> + return -EBUSY;
> }
> #else
> - base = card.NCR5380_map_name;
> iomem_size = NCR53C400_region_size;
> if (!request_mem_region(base, iomem_size, "ncr5380"))
> - return 0;
> + return -EBUSY;
> iomem = ioremap(base, iomem_size);
> if (!iomem) {
> release_mem_region(base, iomem_size);
> - return 0;
> + return -ENOMEM;
> }
> #endif
> - instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
> - if (instance == NULL)
> + instance = scsi_host_alloc(tpnt, sizeof(struct NCR5380_hostdata));
> + if (instance == NULL) {
> + ret = -ENOMEM;
> goto out_release;
> + }
> hostdata = shost_priv(instance);
>
> #ifndef SCSI_G_NCR5380_MEM
> - instance->io_port = card.NCR5380_map_name;
> + instance->io_port = base;
> instance->n_io_port = region_size;
> hostdata->io_width = 1; /* 8-bit PDMA by default */
>
> @@ -251,7 +213,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
> * On NCR53C400 boards, NCR5380 registers are mapped 8 past
> * the base address.
> */
> - switch (card.board) {
> + switch (board) {
> case BOARD_NCR53C400:
> instance->io_port += 8;
> hostdata->c400_ctl_status = 0;
> @@ -269,10 +231,10 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
> break;
> }
> #else
> - instance->base = card.NCR5380_map_name;
> + instance->base = base;
> hostdata->iomem = iomem;
> hostdata->iomem_size = iomem_size;
> - switch (card.board) {
> + switch (board) {
> case BOARD_NCR53C400:
> hostdata->c400_ctl_status = 0x100;
> hostdata->c400_blk_cnt = 0x101;
> @@ -282,14 +244,16 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
> case BOARD_NCR53C400A:
> case BOARD_HP_C2502:
> pr_err(DRV_MODULE_NAME ": unknown register offsets\n");
> + ret = -EINVAL;
> goto out_unregister;
> }
> #endif
>
> - if (NCR5380_init(instance, flags | FLAG_LATE_DMA_SETUP))
> + ret = NCR5380_init(instance, flags | FLAG_LATE_DMA_SETUP);
> + if (ret)
> goto out_unregister;
>
> - switch (card.board) {
> + switch (board) {
> case BOARD_NCR53C400:
> case BOARD_DTC3181E:
> case BOARD_NCR53C400A:
> @@ -299,8 +263,8 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
>
> NCR5380_maybe_reset_bus(instance);
>
> - if (card.irq != IRQ_AUTO)
> - instance->irq = card.irq;
> + if (irq != IRQ_AUTO)
> + instance->irq = irq;
> else
> instance->irq = NCR5380_probe_irq(instance, 0xffff);
>
> @@ -311,7 +275,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
> if (instance->irq != NO_IRQ) {
> #ifndef SCSI_G_NCR5380_MEM
> /* set IRQ for HP C2502 */
> - if (card.board == BOARD_HP_C2502)
> + if (board == BOARD_HP_C2502)
> magic_configure(port_idx, instance->irq, magic);
> #endif
> if (request_irq(instance->irq, generic_NCR5380_intr,
> @@ -326,31 +290,32 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
> printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
> }
>
> - return 1;
> + ret = scsi_add_host(instance, pdev);
> + if (ret)
> + goto out_free_irq;
> + scsi_scan_host(instance);
> + dev_set_drvdata(pdev, instance);
> + return 0;
>
> +out_free_irq:
> + if (instance->irq != NO_IRQ)
> + free_irq(instance->irq, instance);
> + NCR5380_exit(instance);
> out_unregister:
> - scsi_unregister(instance);
> + scsi_host_put(instance);
> out_release:
> #ifndef SCSI_G_NCR5380_MEM
> - release_region(card.NCR5380_map_name, region_size);
> + release_region(base, region_size);
> #else
> iounmap(iomem);
> release_mem_region(base, iomem_size);
> #endif
> - return 0;
> + return ret;
> }
>
> -/**
> - * generic_NCR5380_release_resources - free resources
> - * @instance: host adapter to clean up
> - *
> - * Free the generic interface resources from this adapter.
> - *
> - * Locks: none
> - */
> -
> -static int generic_NCR5380_release_resources(struct Scsi_Host *instance)
> +static void generic_NCR5380_release_resources(struct Scsi_Host *instance)
> {
> + scsi_remove_host(instance);
> if (instance->irq != NO_IRQ)
> free_irq(instance->irq, instance);
> NCR5380_exit(instance);
> @@ -364,7 +329,7 @@ static int generic_NCR5380_release_resources(struct Scsi_Host *instance)
> release_mem_region(instance->base, hostdata->iomem_size);
> }
> #endif
> - return 0;
> + scsi_host_put(instance);
> }
>
> /**
> @@ -554,10 +519,9 @@ static int generic_NCR5380_dma_xfer_len(struct Scsi_Host *instance,
> #include "NCR5380.c"
>
> static struct scsi_host_template driver_template = {
> + .module = THIS_MODULE,
> .proc_name = DRV_MODULE_NAME,
> .name = "Generic NCR5380/NCR53C400 SCSI",
> - .detect = generic_NCR5380_detect,
> - .release = generic_NCR5380_release_resources,
> .info = generic_NCR5380_info,
> .queuecommand = generic_NCR5380_queue_command,
> .eh_abort_handler = generic_NCR5380_abort,
> @@ -571,26 +535,115 @@ static struct scsi_host_template driver_template = {
> .max_sectors = 128,
> };
>
> -#include "scsi_module.c"
>
> -module_param(ncr_irq, int, 0);
> -module_param(ncr_dma, int, 0);
> -module_param(ncr_addr, int, 0);
> -module_param(ncr_5380, int, 0);
> -module_param(ncr_53c400, int, 0);
> -module_param(ncr_53c400a, int, 0);
> -module_param(dtc_3181e, int, 0);
> -module_param(hp_c2502, int, 0);
> -MODULE_LICENSE("GPL");
> +static int generic_NCR5380_isa_match(struct device *pdev, unsigned int ndev)
> +{
> + int ret = generic_NCR5380_init_one(&driver_template, pdev, base[ndev],
> + irq[ndev], card[ndev]);
> + if (ret) {
> + if (base[ndev])
> + printk(KERN_WARNING "Card not found at address 0x%03x\n",
> + base[ndev]);
> + return 0;
> + }
>
> -#if !defined(SCSI_G_NCR5380_MEM) && defined(MODULE)
> -static struct isapnp_device_id id_table[] = {
> - {
> - ISAPNP_ANY_ID, ISAPNP_ANY_ID,
> - ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e),
> - 0},
> - {0}
> + return 1;
> +}
> +
> +static int generic_NCR5380_isa_remove(struct device *pdev,
> + unsigned int ndev)
> +{
> + generic_NCR5380_release_resources(dev_get_drvdata(pdev));
> + dev_set_drvdata(pdev, NULL);
> + return 0;
> +}
> +
> +static struct isa_driver generic_NCR5380_isa_driver = {
> + .match = generic_NCR5380_isa_match,
> + .remove = generic_NCR5380_isa_remove,
> + .driver = {
> + .name = DRV_MODULE_NAME
> + },
> +};
> +
> +#if !defined(SCSI_G_NCR5380_MEM) && defined(CONFIG_PNP)
> +static struct pnp_device_id generic_NCR5380_pnp_ids[] = {
> + { .id = "DTC436e", .driver_data = BOARD_DTC3181E },
> + { .id = "" }
> +};
> +MODULE_DEVICE_TABLE(pnp, generic_NCR5380_pnp_ids);
> +
> +static int generic_NCR5380_pnp_probe(struct pnp_dev *pdev,
> + const struct pnp_device_id *id)
> +{
> + int base, irq;
> +
> + if (pnp_activate_dev(pdev) < 0)
> + return -EBUSY;
> +
> + base = pnp_port_start(pdev, 0);
> + irq = pnp_irq(pdev, 0);
> +
> + return generic_NCR5380_init_one(&driver_template, &pdev->dev, base, irq,
> + id->driver_data);
> +}
> +
> +static void generic_NCR5380_pnp_remove(struct pnp_dev *pdev)
> +{
> + generic_NCR5380_release_resources(pnp_get_drvdata(pdev));
> + pnp_set_drvdata(pdev, NULL);
> +}
> +
> +static struct pnp_driver generic_NCR5380_pnp_driver = {
> + .name = DRV_MODULE_NAME,
> + .id_table = generic_NCR5380_pnp_ids,
> + .probe = generic_NCR5380_pnp_probe,
> + .remove = generic_NCR5380_pnp_remove,
> };
> +#endif /* !defined(SCSI_G_NCR5380_MEM) && defined(CONFIG_PNP) */
>
> -MODULE_DEVICE_TABLE(isapnp, id_table);
> +static int pnp_registered, isa_registered;
> +
> +static int __init generic_NCR5380_init(void)
> +{
> + int ret = 0;
> +
> + /* compatibility with old-style parameters */
> + if (irq[0] == 0 && base[0] == 0 && card[0] == -1) {
> + irq[0] = ncr_irq;
> + base[0] = ncr_addr;
> + if (ncr_5380)
> + card[0] = BOARD_NCR5380;
> + if (ncr_53c400)
> + card[0] = BOARD_NCR53C400;
> + if (ncr_53c400a)
> + card[0] = BOARD_NCR53C400A;
> + if (dtc_3181e)
> + card[0] = BOARD_DTC3181E;
> + if (hp_c2502)
> + card[0] = BOARD_HP_C2502;
> + }
> +
> +#if !defined(SCSI_G_NCR5380_MEM) && defined(CONFIG_PNP)
> + if (!pnp_register_driver(&generic_NCR5380_pnp_driver))
> + pnp_registered = 1;
> #endif
> + ret = isa_register_driver(&generic_NCR5380_isa_driver, MAX_CARDS);
> + if (!ret)
> + isa_registered = 1;
> +
> + return (pnp_registered || isa_registered) ? 0 : ret;
> +}
> +
> +static void __exit generic_NCR5380_exit(void)
> +{
> +#if !defined(SCSI_G_NCR5380_MEM) && defined(CONFIG_PNP)
> + if (pnp_registered)
> + pnp_unregister_driver(&generic_NCR5380_pnp_driver);
> +#endif
> + if (isa_registered)
> + isa_unregister_driver(&generic_NCR5380_isa_driver);
> +}
> +
> +module_init(generic_NCR5380_init);
> +module_exit(generic_NCR5380_exit);
> diff --git a/drivers/scsi/g_NCR5380.h b/drivers/scsi/g_NCR5380.h
> index 5951774..b175b92 100644
> --- a/drivers/scsi/g_NCR5380.h
> +++ b/drivers/scsi/g_NCR5380.h
> @@ -14,15 +14,9 @@
> #ifndef GENERIC_NCR5380_H
> #define GENERIC_NCR5380_H
>
> -#define __STRVAL(x) #x
> -#define STRVAL(x) __STRVAL(x)
> -
> #ifndef SCSI_G_NCR5380_MEM
> #define DRV_MODULE_NAME "g_NCR5380"
>
> -#define NCR5380_map_type int
> -#define NCR5380_map_name port
> -
> #define NCR5380_read(reg) \
> inb(instance->io_port + (reg))
> #define NCR5380_write(reg, value) \
> @@ -38,8 +32,6 @@
> /* therefore SCSI_G_NCR5380_MEM */
> #define DRV_MODULE_NAME "g_NCR5380_mmio"
>
> -#define NCR5380_map_type unsigned long
> -#define NCR5380_map_name base
> #define NCR53C400_mem_base 0x3880
> #define NCR53C400_host_buffer 0x3900
> #define NCR53C400_region_size 0x3a00
>
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