--- /dev/null
+/*
+ * linux/drivers/acorn/scsi/powertec.c
+ *
+ * Copyright (C) 1997-2005 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/dma.h>
+#include <asm/ecard.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+
+#include "../scsi.h"
+#include <scsi/scsi_host.h>
+#include "fas216.h"
+#include "scsi.h"
+
+#include <scsi/scsicam.h>
+
+#define POWERTEC_FAS216_OFFSET 0x3000
+#define POWERTEC_FAS216_SHIFT 6
+
+#define POWERTEC_INTR_STATUS 0x2000
+#define POWERTEC_INTR_BIT 0x80
+
+#define POWERTEC_RESET_CONTROL 0x1018
+#define POWERTEC_RESET_BIT 1
+
+#define POWERTEC_TERM_CONTROL 0x2018
+#define POWERTEC_TERM_ENABLE 1
+
+#define POWERTEC_INTR_CONTROL 0x101c
+#define POWERTEC_INTR_ENABLE 1
+#define POWERTEC_INTR_DISABLE 0
+
+#define VERSION "1.10 (19/01/2003 2.5.59)"
+
+/*
+ * Use term=0,1,0,0,0 to turn terminators on/off.
+ * One entry per slot.
+ */
+static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
+
+#define NR_SG 256
+
+struct powertec_info {
+ FAS216_Info info;
+ struct expansion_card *ec;
+ void __iomem *base;
+ unsigned int term_ctl;
+ struct scatterlist sg[NR_SG];
+};
+
+/* Prototype: void powertecscsi_irqenable(ec, irqnr)
+ * Purpose : Enable interrupts on Powertec SCSI card
+ * Params : ec - expansion card structure
+ * : irqnr - interrupt number
+ */
+static void
+powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
+{
+ struct powertec_info *info = ec->irq_data;
+ writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
+}
+
+/* Prototype: void powertecscsi_irqdisable(ec, irqnr)
+ * Purpose : Disable interrupts on Powertec SCSI card
+ * Params : ec - expansion card structure
+ * : irqnr - interrupt number
+ */
+static void
+powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
+{
+ struct powertec_info *info = ec->irq_data;
+ writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
+}
+
+static const expansioncard_ops_t powertecscsi_ops = {
+ .irqenable = powertecscsi_irqenable,
+ .irqdisable = powertecscsi_irqdisable,
+};
+
+/* Prototype: void powertecscsi_terminator_ctl(host, on_off)
+ * Purpose : Turn the Powertec SCSI terminators on or off
+ * Params : host - card to turn on/off
+ * : on_off - !0 to turn on, 0 to turn off
+ */
+static void
+powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
+{
+ struct powertec_info *info = (struct powertec_info *)host->hostdata;
+
+ info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
+ writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);
+}
+
+/* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
+ * Purpose : handle interrupts from Powertec SCSI card
+ * Params : irq - interrupt number
+ * dev_id - user-defined (Scsi_Host structure)
+ */
+static irqreturn_t powertecscsi_intr(int irq, void *dev_id)
+{
+ struct powertec_info *info = dev_id;
+
+ return fas216_intr(&info->info);
+}
+
+/* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
+ * Purpose : initialises DMA/PIO
+ * Params : host - host
+ * SCpnt - command
+ * direction - DMA on to/off of card
+ * min_type - minimum DMA support that we must have for this transfer
+ * Returns : type of transfer to be performed
+ */
+static fasdmatype_t
+powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
+ fasdmadir_t direction, fasdmatype_t min_type)
+{
+ struct powertec_info *info = (struct powertec_info *)host->hostdata;
+ struct device *dev = scsi_get_device(host);
+ int dmach = info->info.scsi.dma;
+
+ if (info->info.ifcfg.capabilities & FASCAP_DMA &&
+ min_type == fasdma_real_all) {
+ int bufs, map_dir, dma_dir;
+
+ bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
+
+ if (direction == DMA_OUT)
+ map_dir = DMA_TO_DEVICE,
+ dma_dir = DMA_MODE_WRITE;
+ else
+ map_dir = DMA_FROM_DEVICE,
+ dma_dir = DMA_MODE_READ;
+
+ dma_map_sg(dev, info->sg, bufs, map_dir);
+
+ disable_dma(dmach);
+ set_dma_sg(dmach, info->sg, bufs);
+ set_dma_mode(dmach, dma_dir);
+ enable_dma(dmach);
+ return fasdma_real_all;
+ }
+
+ /*
+ * If we're not doing DMA,
+ * we'll do slow PIO
+ */
+ return fasdma_pio;
+}
+
+/* Prototype: int powertecscsi_dma_stop(host, SCpnt)
+ * Purpose : stops DMA/PIO
+ * Params : host - host
+ * SCpnt - command
+ */
+static void
+powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
+{
+ struct powertec_info *info = (struct powertec_info *)host->hostdata;
+ if (info->info.scsi.dma != NO_DMA)
+ disable_dma(info->info.scsi.dma);
+}
+
+/* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
+ * Purpose : returns a descriptive string about this interface,
+ * Params : host - driver host structure to return info for.
+ * Returns : pointer to a static buffer containing null terminated string.
+ */
+const char *powertecscsi_info(struct Scsi_Host *host)
+{
+ struct powertec_info *info = (struct powertec_info *)host->hostdata;
+ static char string[150];
+
+ sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
+ host->hostt->name, info->info.scsi.type, info->ec->slot_no,
+ VERSION, info->term_ctl ? "n" : "ff");
+
+ return string;
+}
+
+/* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
+ * Purpose : Set a driver specific function
+ * Params : host - host to setup
+ * : buffer - buffer containing string describing operation
+ * : length - length of string
+ * Returns : -EINVAL, or 0
+ */
+static int
+powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
+{
+ int ret = length;
+
+ if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
+ buffer += 12;
+ length -= 12;
+
+ if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
+ if (buffer[5] == '1')
+ powertecscsi_terminator_ctl(host, 1);
+ else if (buffer[5] == '0')
+ powertecscsi_terminator_ctl(host, 0);
+ else
+ ret = -EINVAL;
+ } else
+ ret = -EINVAL;
+ } else
+ ret = -EINVAL;
+
+ return ret;
+}
+
+/* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
+ * int length, int host_no, int inout)
+ * Purpose : Return information about the driver to a user process accessing
+ * the /proc filesystem.
+ * Params : buffer - a buffer to write information to
+ * start - a pointer into this buffer set by this routine to the start
+ * of the required information.
+ * offset - offset into information that we have read up to.
+ * length - length of buffer
+ * inout - 0 for reading, 1 for writing.
+ * Returns : length of data written to buffer.
+ */
+static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
+{
+ struct powertec_info *info;
+
+ info = (struct powertec_info *)host->hostdata;
+
+ seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION);
+ fas216_print_host(&info->info, m);
+ seq_printf(m, "Term : o%s\n",
+ info->term_ctl ? "n" : "ff");
+
+ fas216_print_stats(&info->info, m);
+ fas216_print_devices(&info->info, m);
+ return 0;
+}
+
+static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct expansion_card *ec = ECARD_DEV(dev);
+ struct Scsi_Host *host = ecard_get_drvdata(ec);
+ struct powertec_info *info = (struct powertec_info *)host->hostdata;
+
+ return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
+}
+
+static ssize_t
+powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct expansion_card *ec = ECARD_DEV(dev);
+ struct Scsi_Host *host = ecard_get_drvdata(ec);
+
+ if (len > 1)
+ powertecscsi_terminator_ctl(host, buf[0] != '0');
+
+ return len;
+}
+
+static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
+ powertecscsi_show_term, powertecscsi_store_term);
+
+static struct scsi_host_template powertecscsi_template = {
+ .module = THIS_MODULE,
+ .show_info = powertecscsi_show_info,
+ .write_info = powertecscsi_set_proc_info,
+ .name = "PowerTec SCSI",
+ .info = powertecscsi_info,
+ .queuecommand = fas216_queue_command,
+ .eh_host_reset_handler = fas216_eh_host_reset,
+ .eh_bus_reset_handler = fas216_eh_bus_reset,
+ .eh_device_reset_handler = fas216_eh_device_reset,
+ .eh_abort_handler = fas216_eh_abort,
+
+ .can_queue = 8,
+ .this_id = 7,
+ .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
+ .dma_boundary = IOMD_DMA_BOUNDARY,
+ .cmd_per_lun = 2,
+ .use_clustering = ENABLE_CLUSTERING,
+ .proc_name = "powertec",
+};
+
+static int powertecscsi_probe(struct expansion_card *ec,
+ const struct ecard_id *id)
+{
+ struct Scsi_Host *host;
+ struct powertec_info *info;
+ void __iomem *base;
+ int ret;
+
+ ret = ecard_request_resources(ec);
+ if (ret)
+ goto out;
+
+ base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
+ if (!base) {
+ ret = -ENOMEM;
+ goto out_region;
+ }
+
+ host = scsi_host_alloc(&powertecscsi_template,
+ sizeof (struct powertec_info));
+ if (!host) {
+ ret = -ENOMEM;
+ goto out_region;
+ }
+
+ ecard_set_drvdata(ec, host);
+
+ info = (struct powertec_info *)host->hostdata;
+ info->base = base;
+ powertecscsi_terminator_ctl(host, term[ec->slot_no]);
+
+ info->ec = ec;
+ info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET;
+ info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT;
+ info->info.scsi.irq = ec->irq;
+ info->info.scsi.dma = ec->dma;
+ info->info.ifcfg.clockrate = 40; /* MHz */
+ info->info.ifcfg.select_timeout = 255;
+ info->info.ifcfg.asyncperiod = 200; /* ns */
+ info->info.ifcfg.sync_max_depth = 7;
+ info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
+ info->info.ifcfg.disconnect_ok = 1;
+ info->info.ifcfg.wide_max_size = 0;
+ info->info.ifcfg.capabilities = 0;
+ info->info.dma.setup = powertecscsi_dma_setup;
+ info->info.dma.pseudo = NULL;
+ info->info.dma.stop = powertecscsi_dma_stop;
+
+ ec->irqaddr = base + POWERTEC_INTR_STATUS;
+ ec->irqmask = POWERTEC_INTR_BIT;
+
+ ecard_setirq(ec, &powertecscsi_ops, info);
+
+ device_create_file(&ec->dev, &dev_attr_bus_term);
+
+ ret = fas216_init(host);
+ if (ret)
+ goto out_free;
+
+ ret = request_irq(ec->irq, powertecscsi_intr,
+ 0, "powertec", info);
+ if (ret) {
+ printk("scsi%d: IRQ%d not free: %d\n",
+ host->host_no, ec->irq, ret);
+ goto out_release;
+ }
+
+ if (info->info.scsi.dma != NO_DMA) {
+ if (request_dma(info->info.scsi.dma, "powertec")) {
+ printk("scsi%d: DMA%d not free, using PIO\n",
+ host->host_no, info->info.scsi.dma);
+ info->info.scsi.dma = NO_DMA;
+ } else {
+ set_dma_speed(info->info.scsi.dma, 180);
+ info->info.ifcfg.capabilities |= FASCAP_DMA;
+ }
+ }
+
+ ret = fas216_add(host, &ec->dev);
+ if (ret == 0)
+ goto out;
+
+ if (info->info.scsi.dma != NO_DMA)
+ free_dma(info->info.scsi.dma);
+ free_irq(ec->irq, host);
+
+ out_release:
+ fas216_release(host);
+
+ out_free:
+ device_remove_file(&ec->dev, &dev_attr_bus_term);
+ scsi_host_put(host);
+
+ out_region:
+ ecard_release_resources(ec);
+
+ out:
+ return ret;
+}
+
+static void powertecscsi_remove(struct expansion_card *ec)
+{
+ struct Scsi_Host *host = ecard_get_drvdata(ec);
+ struct powertec_info *info = (struct powertec_info *)host->hostdata;
+
+ ecard_set_drvdata(ec, NULL);
+ fas216_remove(host);
+
+ device_remove_file(&ec->dev, &dev_attr_bus_term);
+
+ if (info->info.scsi.dma != NO_DMA)
+ free_dma(info->info.scsi.dma);
+ free_irq(ec->irq, info);
+
+ fas216_release(host);
+ scsi_host_put(host);
+ ecard_release_resources(ec);
+}
+
+static const struct ecard_id powertecscsi_cids[] = {
+ { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
+ { 0xffff, 0xffff },
+};
+
+static struct ecard_driver powertecscsi_driver = {
+ .probe = powertecscsi_probe,
+ .remove = powertecscsi_remove,
+ .id_table = powertecscsi_cids,
+ .drv = {
+ .name = "powertecscsi",
+ },
+};
+
+static int __init powertecscsi_init(void)
+{
+ return ecard_register_driver(&powertecscsi_driver);
+}
+
+static void __exit powertecscsi_exit(void)
+{
+ ecard_remove_driver(&powertecscsi_driver);
+}
+
+module_init(powertecscsi_init);
+module_exit(powertecscsi_exit);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("Powertec SCSI driver");
+module_param_array(term, int, NULL, 0);
+MODULE_PARM_DESC(term, "SCSI bus termination");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff