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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/scsi/a3000.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/scsi/a3000.c')
-rw-r--r--drivers/scsi/a3000.c310
1 files changed, 310 insertions, 0 deletions
diff --git a/drivers/scsi/a3000.c b/drivers/scsi/a3000.c
new file mode 100644
index 000000000..2c5cb1a02
--- /dev/null
+++ b/drivers/scsi/a3000.c
@@ -0,0 +1,310 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+
+#include <asm/page.h>
+#include <asm/amigaints.h>
+#include <asm/amigahw.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_tcq.h>
+#include "wd33c93.h"
+#include "a3000.h"
+
+
+struct a3000_hostdata {
+ struct WD33C93_hostdata wh;
+ struct a3000_scsiregs *regs;
+ struct device *dev;
+};
+
+#define DMA_DIR(d) ((d == DATA_OUT_DIR) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
+
+static irqreturn_t a3000_intr(int irq, void *data)
+{
+ struct Scsi_Host *instance = data;
+ struct a3000_hostdata *hdata = shost_priv(instance);
+ unsigned int status = hdata->regs->ISTR;
+ unsigned long flags;
+
+ if (!(status & ISTR_INT_P))
+ return IRQ_NONE;
+ if (status & ISTR_INTS) {
+ spin_lock_irqsave(instance->host_lock, flags);
+ wd33c93_intr(instance);
+ spin_unlock_irqrestore(instance->host_lock, flags);
+ return IRQ_HANDLED;
+ }
+ pr_warn("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
+ return IRQ_NONE;
+}
+
+static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
+{
+ struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd);
+ unsigned long len = scsi_pointer->this_residual;
+ struct Scsi_Host *instance = cmd->device->host;
+ struct a3000_hostdata *hdata = shost_priv(instance);
+ struct WD33C93_hostdata *wh = &hdata->wh;
+ struct a3000_scsiregs *regs = hdata->regs;
+ unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
+ dma_addr_t addr;
+
+ addr = dma_map_single(hdata->dev, scsi_pointer->ptr,
+ len, DMA_DIR(dir_in));
+ if (dma_mapping_error(hdata->dev, addr)) {
+ dev_warn(hdata->dev, "cannot map SCSI data block %p\n",
+ scsi_pointer->ptr);
+ return 1;
+ }
+ scsi_pointer->dma_handle = addr;
+
+ /*
+ * if the physical address has the wrong alignment, or if
+ * physical address is bad, or if it is a write and at the
+ * end of a physical memory chunk, then allocate a bounce
+ * buffer
+ * MSch 20220629 - only wrong alignment tested - bounce
+ * buffer returned by kmalloc is guaranteed to be aligned
+ */
+ if (addr & A3000_XFER_MASK) {
+ WARN_ONCE(1, "Invalid alignment for DMA!");
+ /* drop useless mapping */
+ dma_unmap_single(hdata->dev, scsi_pointer->dma_handle,
+ scsi_pointer->this_residual,
+ DMA_DIR(dir_in));
+
+ wh->dma_bounce_len = (scsi_pointer->this_residual + 511) & ~0x1ff;
+ wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
+ GFP_KERNEL);
+
+ /* can't allocate memory; use PIO */
+ if (!wh->dma_bounce_buffer) {
+ wh->dma_bounce_len = 0;
+ scsi_pointer->dma_handle = (dma_addr_t) NULL;
+ return 1;
+ }
+
+ if (!dir_in) {
+ /* copy to bounce buffer for a write */
+ memcpy(wh->dma_bounce_buffer, scsi_pointer->ptr,
+ scsi_pointer->this_residual);
+ }
+
+ addr = dma_map_single(hdata->dev, scsi_pointer->ptr,
+ len, DMA_DIR(dir_in));
+ if (dma_mapping_error(hdata->dev, addr)) {
+ dev_warn(hdata->dev,
+ "cannot map SCSI data block %p\n",
+ scsi_pointer->ptr);
+ return 1;
+ }
+ scsi_pointer->dma_handle = addr;
+ }
+
+ /* setup dma direction */
+ if (!dir_in)
+ cntr |= CNTR_DDIR;
+
+ /* remember direction */
+ wh->dma_dir = dir_in;
+
+ regs->CNTR = cntr;
+
+ /* setup DMA *physical* address */
+ regs->ACR = addr;
+
+ /* no more cache flush here - dma_map_single() takes care */
+
+ /* start DMA */
+ mb(); /* make sure setup is completed */
+ regs->ST_DMA = 1;
+ mb(); /* make sure DMA has started before next IO */
+
+ /* return success */
+ return 0;
+}
+
+static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
+ int status)
+{
+ struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(SCpnt);
+ struct a3000_hostdata *hdata = shost_priv(instance);
+ struct WD33C93_hostdata *wh = &hdata->wh;
+ struct a3000_scsiregs *regs = hdata->regs;
+
+ /* disable SCSI interrupts */
+ unsigned short cntr = CNTR_PDMD;
+
+ if (!wh->dma_dir)
+ cntr |= CNTR_DDIR;
+
+ regs->CNTR = cntr;
+ mb(); /* make sure CNTR is updated before next IO */
+
+ /* flush if we were reading */
+ if (wh->dma_dir) {
+ regs->FLUSH = 1;
+ mb(); /* don't allow prefetch */
+ while (!(regs->ISTR & ISTR_FE_FLG))
+ barrier();
+ mb(); /* no IO until FLUSH is done */
+ }
+
+ /* clear a possible interrupt */
+ /* I think that this CINT is only necessary if you are
+ * using the terminal count features. HM 7 Mar 1994
+ */
+ regs->CINT = 1;
+
+ /* stop DMA */
+ regs->SP_DMA = 1;
+ mb(); /* make sure DMA is stopped before next IO */
+
+ /* restore the CONTROL bits (minus the direction flag) */
+ regs->CNTR = CNTR_PDMD | CNTR_INTEN;
+ mb(); /* make sure CNTR is updated before next IO */
+
+ dma_unmap_single(hdata->dev, scsi_pointer->dma_handle,
+ scsi_pointer->this_residual,
+ DMA_DIR(wh->dma_dir));
+
+ /* copy from a bounce buffer, if necessary */
+ if (status && wh->dma_bounce_buffer) {
+ if (SCpnt) {
+ if (wh->dma_dir && SCpnt)
+ memcpy(scsi_pointer->ptr, wh->dma_bounce_buffer,
+ scsi_pointer->this_residual);
+ kfree(wh->dma_bounce_buffer);
+ wh->dma_bounce_buffer = NULL;
+ wh->dma_bounce_len = 0;
+ } else {
+ kfree(wh->dma_bounce_buffer);
+ wh->dma_bounce_buffer = NULL;
+ wh->dma_bounce_len = 0;
+ }
+ }
+}
+
+static struct scsi_host_template amiga_a3000_scsi_template = {
+ .module = THIS_MODULE,
+ .name = "Amiga 3000 built-in SCSI",
+ .show_info = wd33c93_show_info,
+ .write_info = wd33c93_write_info,
+ .proc_name = "A3000",
+ .queuecommand = wd33c93_queuecommand,
+ .eh_abort_handler = wd33c93_abort,
+ .eh_host_reset_handler = wd33c93_host_reset,
+ .can_queue = CAN_QUEUE,
+ .this_id = 7,
+ .sg_tablesize = SG_ALL,
+ .cmd_per_lun = CMD_PER_LUN,
+ .cmd_size = sizeof(struct scsi_pointer),
+};
+
+static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct Scsi_Host *instance;
+ int error;
+ struct a3000_scsiregs *regs;
+ wd33c93_regs wdregs;
+ struct a3000_hostdata *hdata;
+
+ if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32))) {
+ dev_warn(&pdev->dev, "cannot use 32 bit DMA\n");
+ return -ENODEV;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
+ return -EBUSY;
+
+ instance = scsi_host_alloc(&amiga_a3000_scsi_template,
+ sizeof(struct a3000_hostdata));
+ if (!instance) {
+ error = -ENOMEM;
+ goto fail_alloc;
+ }
+
+ instance->irq = IRQ_AMIGA_PORTS;
+
+ regs = ZTWO_VADDR(res->start);
+ regs->DAWR = DAWR_A3000;
+
+ wdregs.SASR = &regs->SASR;
+ wdregs.SCMD = &regs->SCMD;
+
+ hdata = shost_priv(instance);
+ hdata->dev = &pdev->dev;
+ hdata->wh.no_sync = 0xff;
+ hdata->wh.fast = 0;
+ hdata->wh.dma_mode = CTRL_DMA;
+ hdata->regs = regs;
+
+ wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
+ error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
+ "A3000 SCSI", instance);
+ if (error)
+ goto fail_irq;
+
+ regs->CNTR = CNTR_PDMD | CNTR_INTEN;
+
+ error = scsi_add_host(instance, NULL);
+ if (error)
+ goto fail_host;
+
+ platform_set_drvdata(pdev, instance);
+
+ scsi_scan_host(instance);
+ return 0;
+
+fail_host:
+ free_irq(IRQ_AMIGA_PORTS, instance);
+fail_irq:
+ scsi_host_put(instance);
+fail_alloc:
+ release_mem_region(res->start, resource_size(res));
+ return error;
+}
+
+static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
+{
+ struct Scsi_Host *instance = platform_get_drvdata(pdev);
+ struct a3000_hostdata *hdata = shost_priv(instance);
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ hdata->regs->CNTR = 0;
+ scsi_remove_host(instance);
+ free_irq(IRQ_AMIGA_PORTS, instance);
+ scsi_host_put(instance);
+ release_mem_region(res->start, resource_size(res));
+ return 0;
+}
+
+static struct platform_driver amiga_a3000_scsi_driver = {
+ .remove = __exit_p(amiga_a3000_scsi_remove),
+ .driver = {
+ .name = "amiga-a3000-scsi",
+ },
+};
+
+module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe);
+
+MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:amiga-a3000-scsi");