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Diffstat (limited to 'drivers/scsi/sun3_scsi.c')
-rw-r--r--drivers/scsi/sun3_scsi.c670
1 files changed, 670 insertions, 0 deletions
diff --git a/drivers/scsi/sun3_scsi.c b/drivers/scsi/sun3_scsi.c
new file mode 100644
index 000000000..abf229b84
--- /dev/null
+++ b/drivers/scsi/sun3_scsi.c
@@ -0,0 +1,670 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl)
+ *
+ * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net)
+ *
+ * VME support added by Sam Creasey
+ *
+ * TODO: modify this driver to support multiple Sun3 SCSI VME boards
+ *
+ * Adapted from mac_scsinew.c:
+ */
+/*
+ * Generic Macintosh NCR5380 driver
+ *
+ * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
+ *
+ * derived in part from:
+ */
+/*
+ * Generic Generic NCR5380 driver
+ *
+ * Copyright 1995, Russell King
+ */
+
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include <asm/dvma.h>
+
+#include <scsi/scsi_host.h>
+
+/* minimum number of bytes to do dma on */
+#define DMA_MIN_SIZE 129
+
+/* Definitions for the core NCR5380 driver. */
+
+#define NCR5380_implementation_fields /* none */
+
+#define NCR5380_read(reg) in_8(hostdata->io + (reg))
+#define NCR5380_write(reg, value) out_8(hostdata->io + (reg), value)
+
+#define NCR5380_queue_command sun3scsi_queue_command
+#define NCR5380_host_reset sun3scsi_host_reset
+#define NCR5380_abort sun3scsi_abort
+#define NCR5380_info sun3scsi_info
+
+#define NCR5380_dma_xfer_len sun3scsi_dma_xfer_len
+#define NCR5380_dma_recv_setup sun3scsi_dma_count
+#define NCR5380_dma_send_setup sun3scsi_dma_count
+#define NCR5380_dma_residual sun3scsi_dma_residual
+
+#include "NCR5380.h"
+
+/* dma regs start at regbase + 8, directly after the NCR regs */
+struct sun3_dma_regs {
+ unsigned short dma_addr_hi; /* vme only */
+ unsigned short dma_addr_lo; /* vme only */
+ unsigned short dma_count_hi; /* vme only */
+ unsigned short dma_count_lo; /* vme only */
+ unsigned short udc_data; /* udc dma data reg (obio only) */
+ unsigned short udc_addr; /* uda dma addr reg (obio only) */
+ unsigned short fifo_data; /* fifo data reg,
+ * holds extra byte on odd dma reads
+ */
+ unsigned short fifo_count;
+ unsigned short csr; /* control/status reg */
+ unsigned short bpack_hi; /* vme only */
+ unsigned short bpack_lo; /* vme only */
+ unsigned short ivect; /* vme only */
+ unsigned short fifo_count_hi; /* vme only */
+};
+
+/* ucd chip specific regs - live in dvma space */
+struct sun3_udc_regs {
+ unsigned short rsel; /* select regs to load */
+ unsigned short addr_hi; /* high word of addr */
+ unsigned short addr_lo; /* low word */
+ unsigned short count; /* words to be xfer'd */
+ unsigned short mode_hi; /* high word of channel mode */
+ unsigned short mode_lo; /* low word of channel mode */
+};
+
+/* addresses of the udc registers */
+#define UDC_MODE 0x38
+#define UDC_CSR 0x2e /* command/status */
+#define UDC_CHN_HI 0x26 /* chain high word */
+#define UDC_CHN_LO 0x22 /* chain lo word */
+#define UDC_CURA_HI 0x1a /* cur reg A high */
+#define UDC_CURA_LO 0x0a /* cur reg A low */
+#define UDC_CURB_HI 0x12 /* cur reg B high */
+#define UDC_CURB_LO 0x02 /* cur reg B low */
+#define UDC_MODE_HI 0x56 /* mode reg high */
+#define UDC_MODE_LO 0x52 /* mode reg low */
+#define UDC_COUNT 0x32 /* words to xfer */
+
+/* some udc commands */
+#define UDC_RESET 0
+#define UDC_CHN_START 0xa0 /* start chain */
+#define UDC_INT_ENABLE 0x32 /* channel 1 int on */
+
+/* udc mode words */
+#define UDC_MODE_HIWORD 0x40
+#define UDC_MODE_LSEND 0xc2
+#define UDC_MODE_LRECV 0xd2
+
+/* udc reg selections */
+#define UDC_RSEL_SEND 0x282
+#define UDC_RSEL_RECV 0x182
+
+/* bits in csr reg */
+#define CSR_DMA_ACTIVE 0x8000
+#define CSR_DMA_CONFLICT 0x4000
+#define CSR_DMA_BUSERR 0x2000
+
+#define CSR_FIFO_EMPTY 0x400 /* fifo flushed? */
+#define CSR_SDB_INT 0x200 /* sbc interrupt pending */
+#define CSR_DMA_INT 0x100 /* dma interrupt pending */
+
+#define CSR_LEFT 0xc0
+#define CSR_LEFT_3 0xc0
+#define CSR_LEFT_2 0x80
+#define CSR_LEFT_1 0x40
+#define CSR_PACK_ENABLE 0x20
+
+#define CSR_DMA_ENABLE 0x10
+
+#define CSR_SEND 0x8 /* 1 = send 0 = recv */
+#define CSR_FIFO 0x2 /* reset fifo */
+#define CSR_INTR 0x4 /* interrupt enable */
+#define CSR_SCSI 0x1
+
+#define VME_DATA24 0x3d00
+
+extern int sun3_map_test(unsigned long, char *);
+
+static int setup_can_queue = -1;
+module_param(setup_can_queue, int, 0);
+static int setup_cmd_per_lun = -1;
+module_param(setup_cmd_per_lun, int, 0);
+static int setup_sg_tablesize = -1;
+module_param(setup_sg_tablesize, int, 0);
+static int setup_hostid = -1;
+module_param(setup_hostid, int, 0);
+
+/* ms to wait after hitting dma regs */
+#define SUN3_DMA_DELAY 10
+
+/* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
+#define SUN3_DVMA_BUFSIZE 0xe000
+
+static struct scsi_cmnd *sun3_dma_setup_done;
+static volatile struct sun3_dma_regs *dregs;
+static struct sun3_udc_regs *udc_regs;
+static unsigned char *sun3_dma_orig_addr;
+static unsigned long sun3_dma_orig_count;
+static int sun3_dma_active;
+static unsigned long last_residual;
+
+#ifndef SUN3_SCSI_VME
+/* dma controller register access functions */
+
+static inline unsigned short sun3_udc_read(unsigned char reg)
+{
+ unsigned short ret;
+
+ dregs->udc_addr = UDC_CSR;
+ udelay(SUN3_DMA_DELAY);
+ ret = dregs->udc_data;
+ udelay(SUN3_DMA_DELAY);
+
+ return ret;
+}
+
+static inline void sun3_udc_write(unsigned short val, unsigned char reg)
+{
+ dregs->udc_addr = reg;
+ udelay(SUN3_DMA_DELAY);
+ dregs->udc_data = val;
+ udelay(SUN3_DMA_DELAY);
+}
+#endif
+
+// safe bits for the CSR
+#define CSR_GOOD 0x060f
+
+static irqreturn_t scsi_sun3_intr(int irq, void *dev)
+{
+ struct Scsi_Host *instance = dev;
+ unsigned short csr = dregs->csr;
+ int handled = 0;
+
+#ifdef SUN3_SCSI_VME
+ dregs->csr &= ~CSR_DMA_ENABLE;
+#endif
+
+ if(csr & ~CSR_GOOD) {
+ if (csr & CSR_DMA_BUSERR)
+ shost_printk(KERN_ERR, instance, "bus error in DMA\n");
+ if (csr & CSR_DMA_CONFLICT)
+ shost_printk(KERN_ERR, instance, "DMA conflict\n");
+ handled = 1;
+ }
+
+ if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
+ NCR5380_intr(irq, dev);
+ handled = 1;
+ }
+
+ return IRQ_RETVAL(handled);
+}
+
+/* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
+static int sun3scsi_dma_setup(struct NCR5380_hostdata *hostdata,
+ unsigned char *data, int count, int write_flag)
+{
+ void *addr;
+
+ if(sun3_dma_orig_addr != NULL)
+ dvma_unmap(sun3_dma_orig_addr);
+
+#ifdef SUN3_SCSI_VME
+ addr = (void *)dvma_map_vme((unsigned long) data, count);
+#else
+ addr = (void *)dvma_map((unsigned long) data, count);
+#endif
+
+ sun3_dma_orig_addr = addr;
+ sun3_dma_orig_count = count;
+
+#ifndef SUN3_SCSI_VME
+ dregs->fifo_count = 0;
+ sun3_udc_write(UDC_RESET, UDC_CSR);
+
+ /* reset fifo */
+ dregs->csr &= ~CSR_FIFO;
+ dregs->csr |= CSR_FIFO;
+#endif
+
+ /* set direction */
+ if(write_flag)
+ dregs->csr |= CSR_SEND;
+ else
+ dregs->csr &= ~CSR_SEND;
+
+#ifdef SUN3_SCSI_VME
+ dregs->csr |= CSR_PACK_ENABLE;
+
+ dregs->dma_addr_hi = ((unsigned long)addr >> 16);
+ dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
+
+ dregs->dma_count_hi = 0;
+ dregs->dma_count_lo = 0;
+ dregs->fifo_count_hi = 0;
+ dregs->fifo_count = 0;
+#else
+ /* byte count for fifo */
+ dregs->fifo_count = count;
+
+ sun3_udc_write(UDC_RESET, UDC_CSR);
+
+ /* reset fifo */
+ dregs->csr &= ~CSR_FIFO;
+ dregs->csr |= CSR_FIFO;
+
+ if(dregs->fifo_count != count) {
+ shost_printk(KERN_ERR, hostdata->host,
+ "FIFO mismatch %04x not %04x\n",
+ dregs->fifo_count, (unsigned int) count);
+ NCR5380_dprint(NDEBUG_DMA, hostdata->host);
+ }
+
+ /* setup udc */
+ udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8);
+ udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff);
+ udc_regs->count = count/2; /* count in words */
+ udc_regs->mode_hi = UDC_MODE_HIWORD;
+ if(write_flag) {
+ if(count & 1)
+ udc_regs->count++;
+ udc_regs->mode_lo = UDC_MODE_LSEND;
+ udc_regs->rsel = UDC_RSEL_SEND;
+ } else {
+ udc_regs->mode_lo = UDC_MODE_LRECV;
+ udc_regs->rsel = UDC_RSEL_RECV;
+ }
+
+ /* announce location of regs block */
+ sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8),
+ UDC_CHN_HI);
+
+ sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO);
+
+ /* set dma master on */
+ sun3_udc_write(0xd, UDC_MODE);
+
+ /* interrupt enable */
+ sun3_udc_write(UDC_INT_ENABLE, UDC_CSR);
+#endif
+
+ return count;
+
+}
+
+static int sun3scsi_dma_count(struct NCR5380_hostdata *hostdata,
+ unsigned char *data, int count)
+{
+ return count;
+}
+
+static inline int sun3scsi_dma_recv_setup(struct NCR5380_hostdata *hostdata,
+ unsigned char *data, int count)
+{
+ return sun3scsi_dma_setup(hostdata, data, count, 0);
+}
+
+static inline int sun3scsi_dma_send_setup(struct NCR5380_hostdata *hostdata,
+ unsigned char *data, int count)
+{
+ return sun3scsi_dma_setup(hostdata, data, count, 1);
+}
+
+static int sun3scsi_dma_residual(struct NCR5380_hostdata *hostdata)
+{
+ return last_residual;
+}
+
+static int sun3scsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
+ struct scsi_cmnd *cmd)
+{
+ int wanted_len = NCR5380_to_ncmd(cmd)->this_residual;
+
+ if (wanted_len < DMA_MIN_SIZE || blk_rq_is_passthrough(scsi_cmd_to_rq(cmd)))
+ return 0;
+
+ return wanted_len;
+}
+
+static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data)
+{
+#ifdef SUN3_SCSI_VME
+ unsigned short csr;
+
+ csr = dregs->csr;
+
+ dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
+ dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
+
+ dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
+ dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
+
+/* if(!(csr & CSR_DMA_ENABLE))
+ * dregs->csr |= CSR_DMA_ENABLE;
+ */
+#else
+ sun3_udc_write(UDC_CHN_START, UDC_CSR);
+#endif
+
+ return 0;
+}
+
+/* clean up after our dma is done */
+static int sun3scsi_dma_finish(enum dma_data_direction data_dir)
+{
+ const bool write_flag = data_dir == DMA_TO_DEVICE;
+ unsigned short __maybe_unused count;
+ unsigned short fifo;
+ int ret = 0;
+
+ sun3_dma_active = 0;
+
+#ifdef SUN3_SCSI_VME
+ dregs->csr &= ~CSR_DMA_ENABLE;
+
+ fifo = dregs->fifo_count;
+ if (write_flag) {
+ if ((fifo > 0) && (fifo < sun3_dma_orig_count))
+ fifo++;
+ }
+
+ last_residual = fifo;
+ /* empty bytes from the fifo which didn't make it */
+ if ((!write_flag) && (dregs->csr & CSR_LEFT)) {
+ unsigned char *vaddr;
+
+ vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
+
+ vaddr += (sun3_dma_orig_count - fifo);
+ vaddr--;
+
+ switch (dregs->csr & CSR_LEFT) {
+ case CSR_LEFT_3:
+ *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
+ vaddr--;
+ fallthrough;
+
+ case CSR_LEFT_2:
+ *vaddr = (dregs->bpack_hi & 0x00ff);
+ vaddr--;
+ fallthrough;
+
+ case CSR_LEFT_1:
+ *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
+ break;
+ }
+ }
+#else
+ // check to empty the fifo on a read
+ if(!write_flag) {
+ int tmo = 20000; /* .2 sec */
+
+ while(1) {
+ if(dregs->csr & CSR_FIFO_EMPTY)
+ break;
+
+ if(--tmo <= 0) {
+ printk("sun3scsi: fifo failed to empty!\n");
+ return 1;
+ }
+ udelay(10);
+ }
+ }
+
+ dregs->udc_addr = 0x32;
+ udelay(SUN3_DMA_DELAY);
+ count = 2 * dregs->udc_data;
+ udelay(SUN3_DMA_DELAY);
+
+ fifo = dregs->fifo_count;
+ last_residual = fifo;
+
+ /* empty bytes from the fifo which didn't make it */
+ if((!write_flag) && (count - fifo) == 2) {
+ unsigned short data;
+ unsigned char *vaddr;
+
+ data = dregs->fifo_data;
+ vaddr = (unsigned char *)dvma_btov(sun3_dma_orig_addr);
+
+ vaddr += (sun3_dma_orig_count - fifo);
+
+ vaddr[-2] = (data & 0xff00) >> 8;
+ vaddr[-1] = (data & 0xff);
+ }
+#endif
+
+ dvma_unmap(sun3_dma_orig_addr);
+ sun3_dma_orig_addr = NULL;
+
+#ifdef SUN3_SCSI_VME
+ dregs->dma_addr_hi = 0;
+ dregs->dma_addr_lo = 0;
+ dregs->dma_count_hi = 0;
+ dregs->dma_count_lo = 0;
+
+ dregs->fifo_count = 0;
+ dregs->fifo_count_hi = 0;
+
+ dregs->csr &= ~CSR_SEND;
+/* dregs->csr |= CSR_DMA_ENABLE; */
+#else
+ sun3_udc_write(UDC_RESET, UDC_CSR);
+ dregs->fifo_count = 0;
+ dregs->csr &= ~CSR_SEND;
+
+ /* reset fifo */
+ dregs->csr &= ~CSR_FIFO;
+ dregs->csr |= CSR_FIFO;
+#endif
+
+ sun3_dma_setup_done = NULL;
+
+ return ret;
+
+}
+
+#include "NCR5380.c"
+
+#ifdef SUN3_SCSI_VME
+#define SUN3_SCSI_NAME "Sun3 NCR5380 VME SCSI"
+#define DRV_MODULE_NAME "sun3_scsi_vme"
+#else
+#define SUN3_SCSI_NAME "Sun3 NCR5380 SCSI"
+#define DRV_MODULE_NAME "sun3_scsi"
+#endif
+
+#define PFX DRV_MODULE_NAME ": "
+
+static struct scsi_host_template sun3_scsi_template = {
+ .module = THIS_MODULE,
+ .proc_name = DRV_MODULE_NAME,
+ .name = SUN3_SCSI_NAME,
+ .info = sun3scsi_info,
+ .queuecommand = sun3scsi_queue_command,
+ .eh_abort_handler = sun3scsi_abort,
+ .eh_host_reset_handler = sun3scsi_host_reset,
+ .can_queue = 16,
+ .this_id = 7,
+ .sg_tablesize = 1,
+ .cmd_per_lun = 2,
+ .dma_boundary = PAGE_SIZE - 1,
+ .cmd_size = sizeof(struct NCR5380_cmd),
+};
+
+static int __init sun3_scsi_probe(struct platform_device *pdev)
+{
+ struct Scsi_Host *instance;
+ struct NCR5380_hostdata *hostdata;
+ int error;
+ struct resource *irq, *mem;
+ void __iomem *ioaddr;
+ int host_flags = 0;
+#ifdef SUN3_SCSI_VME
+ int i;
+#endif
+
+ if (setup_can_queue > 0)
+ sun3_scsi_template.can_queue = setup_can_queue;
+ if (setup_cmd_per_lun > 0)
+ sun3_scsi_template.cmd_per_lun = setup_cmd_per_lun;
+ if (setup_sg_tablesize > 0)
+ sun3_scsi_template.sg_tablesize = setup_sg_tablesize;
+ if (setup_hostid >= 0)
+ sun3_scsi_template.this_id = setup_hostid & 7;
+
+#ifdef SUN3_SCSI_VME
+ ioaddr = NULL;
+ for (i = 0; i < 2; i++) {
+ unsigned char x;
+
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, i);
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ if (!irq || !mem)
+ break;
+
+ ioaddr = sun3_ioremap(mem->start, resource_size(mem),
+ SUN3_PAGE_TYPE_VME16);
+ dregs = (struct sun3_dma_regs *)(ioaddr + 8);
+
+ if (sun3_map_test((unsigned long)dregs, &x)) {
+ unsigned short oldcsr;
+
+ oldcsr = dregs->csr;
+ dregs->csr = 0;
+ udelay(SUN3_DMA_DELAY);
+ if (dregs->csr == 0x1400)
+ break;
+
+ dregs->csr = oldcsr;
+ }
+
+ iounmap(ioaddr);
+ ioaddr = NULL;
+ }
+ if (!ioaddr)
+ return -ENODEV;
+#else
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!irq || !mem)
+ return -ENODEV;
+
+ ioaddr = ioremap(mem->start, resource_size(mem));
+ dregs = (struct sun3_dma_regs *)(ioaddr + 8);
+
+ udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs));
+ if (!udc_regs) {
+ pr_err(PFX "couldn't allocate DVMA memory!\n");
+ iounmap(ioaddr);
+ return -ENOMEM;
+ }
+#endif
+
+ instance = scsi_host_alloc(&sun3_scsi_template,
+ sizeof(struct NCR5380_hostdata));
+ if (!instance) {
+ error = -ENOMEM;
+ goto fail_alloc;
+ }
+
+ instance->irq = irq->start;
+
+ hostdata = shost_priv(instance);
+ hostdata->base = mem->start;
+ hostdata->io = ioaddr;
+
+ error = NCR5380_init(instance, host_flags);
+ if (error)
+ goto fail_init;
+
+ error = request_irq(instance->irq, scsi_sun3_intr, 0,
+ "NCR5380", instance);
+ if (error) {
+ pr_err(PFX "scsi%d: IRQ %d not free, bailing out\n",
+ instance->host_no, instance->irq);
+ goto fail_irq;
+ }
+
+ dregs->csr = 0;
+ udelay(SUN3_DMA_DELAY);
+ dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
+ udelay(SUN3_DMA_DELAY);
+ dregs->fifo_count = 0;
+#ifdef SUN3_SCSI_VME
+ dregs->fifo_count_hi = 0;
+ dregs->dma_addr_hi = 0;
+ dregs->dma_addr_lo = 0;
+ dregs->dma_count_hi = 0;
+ dregs->dma_count_lo = 0;
+
+ dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
+#endif
+
+ NCR5380_maybe_reset_bus(instance);
+
+ 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(instance->irq, instance);
+fail_irq:
+ NCR5380_exit(instance);
+fail_init:
+ scsi_host_put(instance);
+fail_alloc:
+ if (udc_regs)
+ dvma_free(udc_regs);
+ iounmap(ioaddr);
+ return error;
+}
+
+static int __exit sun3_scsi_remove(struct platform_device *pdev)
+{
+ struct Scsi_Host *instance = platform_get_drvdata(pdev);
+ struct NCR5380_hostdata *hostdata = shost_priv(instance);
+ void __iomem *ioaddr = hostdata->io;
+
+ scsi_remove_host(instance);
+ free_irq(instance->irq, instance);
+ NCR5380_exit(instance);
+ scsi_host_put(instance);
+ if (udc_regs)
+ dvma_free(udc_regs);
+ iounmap(ioaddr);
+ return 0;
+}
+
+static struct platform_driver sun3_scsi_driver = {
+ .remove = __exit_p(sun3_scsi_remove),
+ .driver = {
+ .name = DRV_MODULE_NAME,
+ },
+};
+
+module_platform_driver_probe(sun3_scsi_driver, sun3_scsi_probe);
+
+MODULE_ALIAS("platform:" DRV_MODULE_NAME);
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-01 23:51:57 +0000