--- /dev/null
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/gfp.h>
+#include <scsi/scsi_host.h>
+#include <linux/ata.h>
+#include <linux/libata.h>
+
+#include <asm/dma.h>
+#include <asm/ecard.h>
+
+#define DRV_NAME "pata_icside"
+
+#define ICS_IDENT_OFFSET 0x2280
+
+#define ICS_ARCIN_V5_INTRSTAT 0x0000
+#define ICS_ARCIN_V5_INTROFFSET 0x0004
+
+#define ICS_ARCIN_V6_INTROFFSET_1 0x2200
+#define ICS_ARCIN_V6_INTRSTAT_1 0x2290
+#define ICS_ARCIN_V6_INTROFFSET_2 0x3200
+#define ICS_ARCIN_V6_INTRSTAT_2 0x3290
+
+struct portinfo {
+ unsigned int dataoffset;
+ unsigned int ctrloffset;
+ unsigned int stepping;
+};
+
+static const struct portinfo pata_icside_portinfo_v5 = {
+ .dataoffset = 0x2800,
+ .ctrloffset = 0x2b80,
+ .stepping = 6,
+};
+
+static const struct portinfo pata_icside_portinfo_v6_1 = {
+ .dataoffset = 0x2000,
+ .ctrloffset = 0x2380,
+ .stepping = 6,
+};
+
+static const struct portinfo pata_icside_portinfo_v6_2 = {
+ .dataoffset = 0x3000,
+ .ctrloffset = 0x3380,
+ .stepping = 6,
+};
+
+struct pata_icside_state {
+ void __iomem *irq_port;
+ void __iomem *ioc_base;
+ unsigned int type;
+ unsigned int dma;
+ struct {
+ u8 port_sel;
+ u8 disabled;
+ unsigned int speed[ATA_MAX_DEVICES];
+ } port[2];
+};
+
+struct pata_icside_info {
+ struct pata_icside_state *state;
+ struct expansion_card *ec;
+ void __iomem *base;
+ void __iomem *irqaddr;
+ unsigned int irqmask;
+ const expansioncard_ops_t *irqops;
+ unsigned int mwdma_mask;
+ unsigned int nr_ports;
+ const struct portinfo *port[2];
+ unsigned long raw_base;
+ unsigned long raw_ioc_base;
+};
+
+#define ICS_TYPE_A3IN 0
+#define ICS_TYPE_A3USER 1
+#define ICS_TYPE_V6 3
+#define ICS_TYPE_V5 15
+#define ICS_TYPE_NOTYPE ((unsigned int)-1)
+
+/* ---------------- Version 5 PCB Support Functions --------------------- */
+/* Prototype: pata_icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
+ * Purpose : enable interrupts from card
+ */
+static void pata_icside_irqenable_arcin_v5 (struct expansion_card *ec, int irqnr)
+{
+ struct pata_icside_state *state = ec->irq_data;
+
+ writeb(0, state->irq_port + ICS_ARCIN_V5_INTROFFSET);
+}
+
+/* Prototype: pata_icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
+ * Purpose : disable interrupts from card
+ */
+static void pata_icside_irqdisable_arcin_v5 (struct expansion_card *ec, int irqnr)
+{
+ struct pata_icside_state *state = ec->irq_data;
+
+ readb(state->irq_port + ICS_ARCIN_V5_INTROFFSET);
+}
+
+static const expansioncard_ops_t pata_icside_ops_arcin_v5 = {
+ .irqenable = pata_icside_irqenable_arcin_v5,
+ .irqdisable = pata_icside_irqdisable_arcin_v5,
+};
+
+
+/* ---------------- Version 6 PCB Support Functions --------------------- */
+/* Prototype: pata_icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
+ * Purpose : enable interrupts from card
+ */
+static void pata_icside_irqenable_arcin_v6 (struct expansion_card *ec, int irqnr)
+{
+ struct pata_icside_state *state = ec->irq_data;
+ void __iomem *base = state->irq_port;
+
+ if (!state->port[0].disabled)
+ writeb(0, base + ICS_ARCIN_V6_INTROFFSET_1);
+ if (!state->port[1].disabled)
+ writeb(0, base + ICS_ARCIN_V6_INTROFFSET_2);
+}
+
+/* Prototype: pata_icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
+ * Purpose : disable interrupts from card
+ */
+static void pata_icside_irqdisable_arcin_v6 (struct expansion_card *ec, int irqnr)
+{
+ struct pata_icside_state *state = ec->irq_data;
+
+ readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_1);
+ readb(state->irq_port + ICS_ARCIN_V6_INTROFFSET_2);
+}
+
+/* Prototype: pata_icside_irqprobe(struct expansion_card *ec)
+ * Purpose : detect an active interrupt from card
+ */
+static int pata_icside_irqpending_arcin_v6(struct expansion_card *ec)
+{
+ struct pata_icside_state *state = ec->irq_data;
+
+ return readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_1) & 1 ||
+ readb(state->irq_port + ICS_ARCIN_V6_INTRSTAT_2) & 1;
+}
+
+static const expansioncard_ops_t pata_icside_ops_arcin_v6 = {
+ .irqenable = pata_icside_irqenable_arcin_v6,
+ .irqdisable = pata_icside_irqdisable_arcin_v6,
+ .irqpending = pata_icside_irqpending_arcin_v6,
+};
+
+
+/*
+ * SG-DMA support.
+ *
+ * Similar to the BM-DMA, but we use the RiscPCs IOMD DMA controllers.
+ * There is only one DMA controller per card, which means that only
+ * one drive can be accessed at one time. NOTE! We do not enforce that
+ * here, but we rely on the main IDE driver spotting that both
+ * interfaces use the same IRQ, which should guarantee this.
+ */
+
+/*
+ * Configure the IOMD to give the appropriate timings for the transfer
+ * mode being requested. We take the advice of the ATA standards, and
+ * calculate the cycle time based on the transfer mode, and the EIDE
+ * MW DMA specs that the drive provides in the IDENTIFY command.
+ *
+ * We have the following IOMD DMA modes to choose from:
+ *
+ * Type Active Recovery Cycle
+ * A 250 (250) 312 (550) 562 (800)
+ * B 187 (200) 250 (550) 437 (750)
+ * C 125 (125) 125 (375) 250 (500)
+ * D 62 (50) 125 (375) 187 (425)
+ *
+ * (figures in brackets are actual measured timings on DIOR/DIOW)
+ *
+ * However, we also need to take care of the read/write active and
+ * recovery timings:
+ *
+ * Read Write
+ * Mode Active -- Recovery -- Cycle IOMD type
+ * MW0 215 50 215 480 A
+ * MW1 80 50 50 150 C
+ * MW2 70 25 25 120 C
+ */
+static void pata_icside_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+ struct pata_icside_state *state = ap->host->private_data;
+ struct ata_timing t;
+ unsigned int cycle;
+ char iomd_type;
+
+ /*
+ * DMA is based on a 16MHz clock
+ */
+ if (ata_timing_compute(adev, adev->dma_mode, &t, 1000, 1))
+ return;
+
+ /*
+ * Choose the IOMD cycle timing which ensure that the interface
+ * satisfies the measured active, recovery and cycle times.
+ */
+ if (t.active <= 50 && t.recover <= 375 && t.cycle <= 425)
+ iomd_type = 'D', cycle = 187;
+ else if (t.active <= 125 && t.recover <= 375 && t.cycle <= 500)
+ iomd_type = 'C', cycle = 250;
+ else if (t.active <= 200 && t.recover <= 550 && t.cycle <= 750)
+ iomd_type = 'B', cycle = 437;
+ else
+ iomd_type = 'A', cycle = 562;
+
+ ata_dev_info(adev, "timings: act %dns rec %dns cyc %dns (%c)\n",
+ t.active, t.recover, t.cycle, iomd_type);
+
+ state->port[ap->port_no].speed[adev->devno] = cycle;
+}
+
+static void pata_icside_bmdma_setup(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct pata_icside_state *state = ap->host->private_data;
+ unsigned int write = qc->tf.flags & ATA_TFLAG_WRITE;
+
+ /*
+ * We are simplex; BUG if we try to fiddle with DMA
+ * while it's active.
+ */
+ BUG_ON(dma_channel_active(state->dma));
+
+ /*
+ * Route the DMA signals to the correct interface
+ */
+ writeb(state->port[ap->port_no].port_sel, state->ioc_base);
+
+ set_dma_speed(state->dma, state->port[ap->port_no].speed[qc->dev->devno]);
+ set_dma_sg(state->dma, qc->sg, qc->n_elem);
+ set_dma_mode(state->dma, write ? DMA_MODE_WRITE : DMA_MODE_READ);
+
+ /* issue r/w command */
+ ap->ops->sff_exec_command(ap, &qc->tf);
+}
+
+static void pata_icside_bmdma_start(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct pata_icside_state *state = ap->host->private_data;
+
+ BUG_ON(dma_channel_active(state->dma));
+ enable_dma(state->dma);
+}
+
+static void pata_icside_bmdma_stop(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct pata_icside_state *state = ap->host->private_data;
+
+ disable_dma(state->dma);
+
+ /* see ata_bmdma_stop */
+ ata_sff_dma_pause(ap);
+}
+
+static u8 pata_icside_bmdma_status(struct ata_port *ap)
+{
+ struct pata_icside_state *state = ap->host->private_data;
+ void __iomem *irq_port;
+
+ irq_port = state->irq_port + (ap->port_no ? ICS_ARCIN_V6_INTRSTAT_2 :
+ ICS_ARCIN_V6_INTRSTAT_1);
+
+ return readb(irq_port) & 1 ? ATA_DMA_INTR : 0;
+}
+
+static int icside_dma_init(struct pata_icside_info *info)
+{
+ struct pata_icside_state *state = info->state;
+ struct expansion_card *ec = info->ec;
+ int i;
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ state->port[0].speed[i] = 480;
+ state->port[1].speed[i] = 480;
+ }
+
+ if (ec->dma != NO_DMA && !request_dma(ec->dma, DRV_NAME)) {
+ state->dma = ec->dma;
+ info->mwdma_mask = ATA_MWDMA2;
+ }
+
+ return 0;
+}
+
+
+static struct scsi_host_template pata_icside_sht = {
+ ATA_BASE_SHT(DRV_NAME),
+ .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
+ .dma_boundary = IOMD_DMA_BOUNDARY,
+};
+
+static void pata_icside_postreset(struct ata_link *link, unsigned int *classes)
+{
+ struct ata_port *ap = link->ap;
+ struct pata_icside_state *state = ap->host->private_data;
+
+ if (classes[0] != ATA_DEV_NONE || classes[1] != ATA_DEV_NONE)
+ return ata_sff_postreset(link, classes);
+
+ state->port[ap->port_no].disabled = 1;
+
+ if (state->type == ICS_TYPE_V6) {
+ /*
+ * Disable interrupts from this port, otherwise we
+ * receive spurious interrupts from the floating
+ * interrupt line.
+ */
+ void __iomem *irq_port = state->irq_port +
+ (ap->port_no ? ICS_ARCIN_V6_INTROFFSET_2 : ICS_ARCIN_V6_INTROFFSET_1);
+ readb(irq_port);
+ }
+}
+
+static struct ata_port_operations pata_icside_port_ops = {
+ .inherits = &ata_bmdma_port_ops,
+ /* no need to build any PRD tables for DMA */
+ .qc_prep = ata_noop_qc_prep,
+ .sff_data_xfer = ata_sff_data_xfer_noirq,
+ .bmdma_setup = pata_icside_bmdma_setup,
+ .bmdma_start = pata_icside_bmdma_start,
+ .bmdma_stop = pata_icside_bmdma_stop,
+ .bmdma_status = pata_icside_bmdma_status,
+
+ .cable_detect = ata_cable_40wire,
+ .set_dmamode = pata_icside_set_dmamode,
+ .postreset = pata_icside_postreset,
+
+ .port_start = ATA_OP_NULL, /* don't need PRD table */
+};
+
+static void pata_icside_setup_ioaddr(struct ata_port *ap, void __iomem *base,
+ struct pata_icside_info *info,
+ const struct portinfo *port)
+{
+ struct ata_ioports *ioaddr = &ap->ioaddr;
+ void __iomem *cmd = base + port->dataoffset;
+
+ ioaddr->cmd_addr = cmd;
+ ioaddr->data_addr = cmd + (ATA_REG_DATA << port->stepping);
+ ioaddr->error_addr = cmd + (ATA_REG_ERR << port->stepping);
+ ioaddr->feature_addr = cmd + (ATA_REG_FEATURE << port->stepping);
+ ioaddr->nsect_addr = cmd + (ATA_REG_NSECT << port->stepping);
+ ioaddr->lbal_addr = cmd + (ATA_REG_LBAL << port->stepping);
+ ioaddr->lbam_addr = cmd + (ATA_REG_LBAM << port->stepping);
+ ioaddr->lbah_addr = cmd + (ATA_REG_LBAH << port->stepping);
+ ioaddr->device_addr = cmd + (ATA_REG_DEVICE << port->stepping);
+ ioaddr->status_addr = cmd + (ATA_REG_STATUS << port->stepping);
+ ioaddr->command_addr = cmd + (ATA_REG_CMD << port->stepping);
+
+ ioaddr->ctl_addr = base + port->ctrloffset;
+ ioaddr->altstatus_addr = ioaddr->ctl_addr;
+
+ ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",
+ info->raw_base + port->dataoffset,
+ info->raw_base + port->ctrloffset);
+
+ if (info->raw_ioc_base)
+ ata_port_desc(ap, "iocbase 0x%lx", info->raw_ioc_base);
+}
+
+static int pata_icside_register_v5(struct pata_icside_info *info)
+{
+ struct pata_icside_state *state = info->state;
+ void __iomem *base;
+
+ base = ecardm_iomap(info->ec, ECARD_RES_MEMC, 0, 0);
+ if (!base)
+ return -ENOMEM;
+
+ state->irq_port = base;
+
+ info->base = base;
+ info->irqaddr = base + ICS_ARCIN_V5_INTRSTAT;
+ info->irqmask = 1;
+ info->irqops = &pata_icside_ops_arcin_v5;
+ info->nr_ports = 1;
+ info->port[0] = &pata_icside_portinfo_v5;
+
+ info->raw_base = ecard_resource_start(info->ec, ECARD_RES_MEMC);
+
+ return 0;
+}
+
+static int pata_icside_register_v6(struct pata_icside_info *info)
+{
+ struct pata_icside_state *state = info->state;
+ struct expansion_card *ec = info->ec;
+ void __iomem *ioc_base, *easi_base;
+ unsigned int sel = 0;
+
+ ioc_base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
+ if (!ioc_base)
+ return -ENOMEM;
+
+ easi_base = ioc_base;
+
+ if (ecard_resource_flags(ec, ECARD_RES_EASI)) {
+ easi_base = ecardm_iomap(ec, ECARD_RES_EASI, 0, 0);
+ if (!easi_base)
+ return -ENOMEM;
+
+ /*
+ * Enable access to the EASI region.
+ */
+ sel = 1 << 5;
+ }
+
+ writeb(sel, ioc_base);
+
+ state->irq_port = easi_base;
+ state->ioc_base = ioc_base;
+ state->port[0].port_sel = sel;
+ state->port[1].port_sel = sel | 1;
+
+ info->base = easi_base;
+ info->irqops = &pata_icside_ops_arcin_v6;
+ info->nr_ports = 2;
+ info->port[0] = &pata_icside_portinfo_v6_1;
+ info->port[1] = &pata_icside_portinfo_v6_2;
+
+ info->raw_base = ecard_resource_start(ec, ECARD_RES_EASI);
+ info->raw_ioc_base = ecard_resource_start(ec, ECARD_RES_IOCFAST);
+
+ return icside_dma_init(info);
+}
+
+static int pata_icside_add_ports(struct pata_icside_info *info)
+{
+ struct expansion_card *ec = info->ec;
+ struct ata_host *host;
+ int i;
+
+ if (info->irqaddr) {
+ ec->irqaddr = info->irqaddr;
+ ec->irqmask = info->irqmask;
+ }
+ if (info->irqops)
+ ecard_setirq(ec, info->irqops, info->state);
+
+ /*
+ * Be on the safe side - disable interrupts
+ */
+ ec->ops->irqdisable(ec, ec->irq);
+
+ host = ata_host_alloc(&ec->dev, info->nr_ports);
+ if (!host)
+ return -ENOMEM;
+
+ host->private_data = info->state;
+ host->flags = ATA_HOST_SIMPLEX;
+
+ for (i = 0; i < info->nr_ports; i++) {
+ struct ata_port *ap = host->ports[i];
+
+ ap->pio_mask = ATA_PIO4;
+ ap->mwdma_mask = info->mwdma_mask;
+ ap->flags |= ATA_FLAG_SLAVE_POSS;
+ ap->ops = &pata_icside_port_ops;
+
+ pata_icside_setup_ioaddr(ap, info->base, info, info->port[i]);
+ }
+
+ return ata_host_activate(host, ec->irq, ata_bmdma_interrupt, 0,
+ &pata_icside_sht);
+}
+
+static int pata_icside_probe(struct expansion_card *ec,
+ const struct ecard_id *id)
+{
+ struct pata_icside_state *state;
+ struct pata_icside_info info;
+ void __iomem *idmem;
+ int ret;
+
+ ret = ecard_request_resources(ec);
+ if (ret)
+ goto out;
+
+ state = devm_kzalloc(&ec->dev, sizeof(*state), GFP_KERNEL);
+ if (!state) {
+ ret = -ENOMEM;
+ goto release;
+ }
+
+ state->type = ICS_TYPE_NOTYPE;
+ state->dma = NO_DMA;
+
+ idmem = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
+ if (idmem) {
+ unsigned int type;
+
+ type = readb(idmem + ICS_IDENT_OFFSET) & 1;
+ type |= (readb(idmem + ICS_IDENT_OFFSET + 4) & 1) << 1;
+ type |= (readb(idmem + ICS_IDENT_OFFSET + 8) & 1) << 2;
+ type |= (readb(idmem + ICS_IDENT_OFFSET + 12) & 1) << 3;
+ ecardm_iounmap(ec, idmem);
+
+ state->type = type;
+ }
+
+ memset(&info, 0, sizeof(info));
+ info.state = state;
+ info.ec = ec;
+
+ switch (state->type) {
+ case ICS_TYPE_A3IN:
+ dev_warn(&ec->dev, "A3IN unsupported\n");
+ ret = -ENODEV;
+ break;
+
+ case ICS_TYPE_A3USER:
+ dev_warn(&ec->dev, "A3USER unsupported\n");
+ ret = -ENODEV;
+ break;
+
+ case ICS_TYPE_V5:
+ ret = pata_icside_register_v5(&info);
+ break;
+
+ case ICS_TYPE_V6:
+ ret = pata_icside_register_v6(&info);
+ break;
+
+ default:
+ dev_warn(&ec->dev, "unknown interface type\n");
+ ret = -ENODEV;
+ break;
+ }
+
+ if (ret == 0)
+ ret = pata_icside_add_ports(&info);
+
+ if (ret == 0)
+ goto out;
+
+ release:
+ ecard_release_resources(ec);
+ out:
+ return ret;
+}
+
+static void pata_icside_shutdown(struct expansion_card *ec)
+{
+ struct ata_host *host = ecard_get_drvdata(ec);
+ unsigned long flags;
+
+ /*
+ * Disable interrupts from this card. We need to do
+ * this before disabling EASI since we may be accessing
+ * this register via that region.
+ */
+ local_irq_save(flags);
+ ec->ops->irqdisable(ec, ec->irq);
+ local_irq_restore(flags);
+
+ /*
+ * Reset the ROM pointer so that we can read the ROM
+ * after a soft reboot. This also disables access to
+ * the IDE taskfile via the EASI region.
+ */
+ if (host) {
+ struct pata_icside_state *state = host->private_data;
+ if (state->ioc_base)
+ writeb(0, state->ioc_base);
+ }
+}
+
+static void pata_icside_remove(struct expansion_card *ec)
+{
+ struct ata_host *host = ecard_get_drvdata(ec);
+ struct pata_icside_state *state = host->private_data;
+
+ ata_host_detach(host);
+
+ pata_icside_shutdown(ec);
+
+ /*
+ * don't NULL out the drvdata - devres/libata wants it
+ * to free the ata_host structure.
+ */
+ if (state->dma != NO_DMA)
+ free_dma(state->dma);
+
+ ecard_release_resources(ec);
+}
+
+static const struct ecard_id pata_icside_ids[] = {
+ { MANU_ICS, PROD_ICS_IDE },
+ { MANU_ICS2, PROD_ICS2_IDE },
+ { 0xffff, 0xffff }
+};
+
+static struct ecard_driver pata_icside_driver = {
+ .probe = pata_icside_probe,
+ .remove = pata_icside_remove,
+ .shutdown = pata_icside_shutdown,
+ .id_table = pata_icside_ids,
+ .drv = {
+ .name = DRV_NAME,
+ },
+};
+
+static int __init pata_icside_init(void)
+{
+ return ecard_register_driver(&pata_icside_driver);
+}
+
+static void __exit pata_icside_exit(void)
+{
+ ecard_remove_driver(&pata_icside_driver);
+}
+
+MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ICS PATA driver");
+
+module_init(pata_icside_init);
+module_exit(pata_icside_exit);
Code Review / kvmfornfv.git / blobdiff