1 files changed, 628 insertions, 0 deletions

diff --git a/drivers/ata/pata_icside.c b/drivers/ata/pata_icside.c
new file mode 100644
index 000000000..08543aeb0
--- /dev/null
+++ b/drivers/ata/pata_icside.c
@@ -0,0 +1,628 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#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		= SG_MAX_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_xfer32,
+	.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);