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authorDavid Daney <ddaney@caviumnetworks.com>2009-01-15 17:45:32 -0800
committerJeff Garzik <jgarzik@redhat.com>2009-01-16 10:23:39 -0500
commit3c929c6f5aa7501790586a38dd8faca8fed9a158 (patch)
tree772ff335f9a9da2d10a40cff5a4070e080d181dc
parent3ada9c126499dd4700dcdbd5b9fe8110ad17f578 (diff)
downloadlinux-stericsson-3c929c6f5aa7501790586a38dd8faca8fed9a158.tar.gz
libata: New driver for OCTEON SOC Compact Flash interface (v7).
Cavium OCTEON processor support was recently merged, so now we have this CF driver for your consideration. Most OCTEON variants have *no* DMA or interrupt support on the CF interface so for these, only PIO is supported. Although if DMA is available, we do take advantage of it. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
-rw-r--r--drivers/ata/Kconfig9
-rw-r--r--drivers/ata/Makefile1
-rw-r--r--drivers/ata/pata_octeon_cf.c965
3 files changed, 975 insertions, 0 deletions
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 1a7be96d627b..503a908afc80 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -698,6 +698,15 @@ config PATA_IXP4XX_CF
If unsure, say N.
+config PATA_OCTEON_CF
+ tristate "OCTEON Boot Bus Compact Flash support"
+ depends on CPU_CAVIUM_OCTEON
+ help
+ This option enables a polled compact flash driver for use with
+ compact flash cards attached to the OCTEON boot bus.
+
+ If unsure, say N.
+
config PATA_SCC
tristate "Toshiba's Cell Reference Set IDE support"
depends on PCI && PPC_CELLEB
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 674965fa326d..7f1ecf99528c 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_PATA_IXP4XX_CF) += pata_ixp4xx_cf.o
obj-$(CONFIG_PATA_SCC) += pata_scc.o
obj-$(CONFIG_PATA_SCH) += pata_sch.o
obj-$(CONFIG_PATA_BF54X) += pata_bf54x.o
+obj-$(CONFIG_PATA_OCTEON_CF) += pata_octeon_cf.o
obj-$(CONFIG_PATA_PLATFORM) += pata_platform.o
obj-$(CONFIG_PATA_OF_PLATFORM) += pata_of_platform.o
obj-$(CONFIG_PATA_ICSIDE) += pata_icside.o
diff --git a/drivers/ata/pata_octeon_cf.c b/drivers/ata/pata_octeon_cf.c
new file mode 100644
index 000000000000..0fe4ef309c62
--- /dev/null
+++ b/drivers/ata/pata_octeon_cf.c
@@ -0,0 +1,965 @@
+/*
+ * Driver for the Octeon bootbus compact flash.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 - 2009 Cavium Networks
+ * Copyright (C) 2008 Wind River Systems
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/libata.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <scsi/scsi_host.h>
+
+#include <asm/octeon/octeon.h>
+
+/*
+ * The Octeon bootbus compact flash interface is connected in at least
+ * 3 different configurations on various evaluation boards:
+ *
+ * -- 8 bits no irq, no DMA
+ * -- 16 bits no irq, no DMA
+ * -- 16 bits True IDE mode with DMA, but no irq.
+ *
+ * In the last case the DMA engine can generate an interrupt when the
+ * transfer is complete. For the first two cases only PIO is supported.
+ *
+ */
+
+#define DRV_NAME "pata_octeon_cf"
+#define DRV_VERSION "2.1"
+
+
+struct octeon_cf_port {
+ struct workqueue_struct *wq;
+ struct delayed_work delayed_finish;
+ struct ata_port *ap;
+ int dma_finished;
+};
+
+static struct scsi_host_template octeon_cf_sht = {
+ ATA_PIO_SHT(DRV_NAME),
+};
+
+/**
+ * Convert nanosecond based time to setting used in the
+ * boot bus timing register, based on timing multiple
+ */
+static unsigned int ns_to_tim_reg(unsigned int tim_mult, unsigned int nsecs)
+{
+ unsigned int val;
+
+ /*
+ * Compute # of eclock periods to get desired duration in
+ * nanoseconds.
+ */
+ val = DIV_ROUND_UP(nsecs * (octeon_get_clock_rate() / 1000000),
+ 1000 * tim_mult);
+
+ return val;
+}
+
+static void octeon_cf_set_boot_reg_cfg(int cs)
+{
+ union cvmx_mio_boot_reg_cfgx reg_cfg;
+ reg_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs));
+ reg_cfg.s.dmack = 0; /* Don't assert DMACK on access */
+ reg_cfg.s.tim_mult = 2; /* Timing mutiplier 2x */
+ reg_cfg.s.rd_dly = 0; /* Sample on falling edge of BOOT_OE */
+ reg_cfg.s.sam = 0; /* Don't combine write and output enable */
+ reg_cfg.s.we_ext = 0; /* No write enable extension */
+ reg_cfg.s.oe_ext = 0; /* No read enable extension */
+ reg_cfg.s.en = 1; /* Enable this region */
+ reg_cfg.s.orbit = 0; /* Don't combine with previous region */
+ reg_cfg.s.ale = 0; /* Don't do address multiplexing */
+ cvmx_write_csr(CVMX_MIO_BOOT_REG_CFGX(cs), reg_cfg.u64);
+}
+
+/**
+ * Called after libata determines the needed PIO mode. This
+ * function programs the Octeon bootbus regions to support the
+ * timing requirements of the PIO mode.
+ *
+ * @ap: ATA port information
+ * @dev: ATA device
+ */
+static void octeon_cf_set_piomode(struct ata_port *ap, struct ata_device *dev)
+{
+ struct octeon_cf_data *ocd = ap->dev->platform_data;
+ union cvmx_mio_boot_reg_timx reg_tim;
+ int cs = ocd->base_region;
+ int T;
+ struct ata_timing timing;
+
+ int use_iordy;
+ int trh;
+ int pause;
+ /* These names are timing parameters from the ATA spec */
+ int t1;
+ int t2;
+ int t2i;
+
+ T = (int)(2000000000000LL / octeon_get_clock_rate());
+
+ if (ata_timing_compute(dev, dev->pio_mode, &timing, T, T))
+ BUG();
+
+ t1 = timing.setup;
+ if (t1)
+ t1--;
+ t2 = timing.active;
+ if (t2)
+ t2--;
+ t2i = timing.act8b;
+ if (t2i)
+ t2i--;
+
+ trh = ns_to_tim_reg(2, 20);
+ if (trh)
+ trh--;
+
+ pause = timing.cycle - timing.active - timing.setup - trh;
+ if (pause)
+ pause--;
+
+ octeon_cf_set_boot_reg_cfg(cs);
+ if (ocd->dma_engine >= 0)
+ /* True IDE mode, program both chip selects. */
+ octeon_cf_set_boot_reg_cfg(cs + 1);
+
+
+ use_iordy = ata_pio_need_iordy(dev);
+
+ reg_tim.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_TIMX(cs));
+ /* Disable page mode */
+ reg_tim.s.pagem = 0;
+ /* Enable dynamic timing */
+ reg_tim.s.waitm = use_iordy;
+ /* Pages are disabled */
+ reg_tim.s.pages = 0;
+ /* We don't use multiplexed address mode */
+ reg_tim.s.ale = 0;
+ /* Not used */
+ reg_tim.s.page = 0;
+ /* Time after IORDY to coninue to assert the data */
+ reg_tim.s.wait = 0;
+ /* Time to wait to complete the cycle. */
+ reg_tim.s.pause = pause;
+ /* How long to hold after a write to de-assert CE. */
+ reg_tim.s.wr_hld = trh;
+ /* How long to wait after a read to de-assert CE. */
+ reg_tim.s.rd_hld = trh;
+ /* How long write enable is asserted */
+ reg_tim.s.we = t2;
+ /* How long read enable is asserted */
+ reg_tim.s.oe = t2;
+ /* Time after CE that read/write starts */
+ reg_tim.s.ce = ns_to_tim_reg(2, 5);
+ /* Time before CE that address is valid */
+ reg_tim.s.adr = 0;
+
+ /* Program the bootbus region timing for the data port chip select. */
+ cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cs), reg_tim.u64);
+ if (ocd->dma_engine >= 0)
+ /* True IDE mode, program both chip selects. */
+ cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cs + 1), reg_tim.u64);
+}
+
+static void octeon_cf_set_dmamode(struct ata_port *ap, struct ata_device *dev)
+{
+ struct octeon_cf_data *ocd = dev->link->ap->dev->platform_data;
+ union cvmx_mio_boot_dma_timx dma_tim;
+ unsigned int oe_a;
+ unsigned int oe_n;
+ unsigned int dma_ackh;
+ unsigned int dma_arq;
+ unsigned int pause;
+ unsigned int T0, Tkr, Td;
+ unsigned int tim_mult;
+
+ const struct ata_timing *timing;
+
+ timing = ata_timing_find_mode(dev->dma_mode);
+ T0 = timing->cycle;
+ Td = timing->active;
+ Tkr = timing->recover;
+ dma_ackh = timing->dmack_hold;
+
+ dma_tim.u64 = 0;
+ /* dma_tim.s.tim_mult = 0 --> 4x */
+ tim_mult = 4;
+
+ /* not spec'ed, value in eclocks, not affected by tim_mult */
+ dma_arq = 8;
+ pause = 25 - dma_arq * 1000 /
+ (octeon_get_clock_rate() / 1000000); /* Tz */
+
+ oe_a = Td;
+ /* Tkr from cf spec, lengthened to meet T0 */
+ oe_n = max(T0 - oe_a, Tkr);
+
+ dma_tim.s.dmack_pi = 1;
+
+ dma_tim.s.oe_n = ns_to_tim_reg(tim_mult, oe_n);
+ dma_tim.s.oe_a = ns_to_tim_reg(tim_mult, oe_a);
+
+ /*
+ * This is tI, C.F. spec. says 0, but Sony CF card requires
+ * more, we use 20 nS.
+ */
+ dma_tim.s.dmack_s = ns_to_tim_reg(tim_mult, 20);;
+ dma_tim.s.dmack_h = ns_to_tim_reg(tim_mult, dma_ackh);
+
+ dma_tim.s.dmarq = dma_arq;
+ dma_tim.s.pause = ns_to_tim_reg(tim_mult, pause);
+
+ dma_tim.s.rd_dly = 0; /* Sample right on edge */
+
+ /* writes only */
+ dma_tim.s.we_n = ns_to_tim_reg(tim_mult, oe_n);
+ dma_tim.s.we_a = ns_to_tim_reg(tim_mult, oe_a);
+
+ pr_debug("ns to ticks (mult %d) of %d is: %d\n", tim_mult, 60,
+ ns_to_tim_reg(tim_mult, 60));
+ pr_debug("oe_n: %d, oe_a: %d, dmack_s: %d, dmack_h: "
+ "%d, dmarq: %d, pause: %d\n",
+ dma_tim.s.oe_n, dma_tim.s.oe_a, dma_tim.s.dmack_s,
+ dma_tim.s.dmack_h, dma_tim.s.dmarq, dma_tim.s.pause);
+
+ cvmx_write_csr(CVMX_MIO_BOOT_DMA_TIMX(ocd->dma_engine),
+ dma_tim.u64);
+
+}
+
+/**
+ * Handle an 8 bit I/O request.
+ *
+ * @dev: Device to access
+ * @buffer: Data buffer
+ * @buflen: Length of the buffer.
+ * @rw: True to write.
+ */
+static unsigned int octeon_cf_data_xfer8(struct ata_device *dev,
+ unsigned char *buffer,
+ unsigned int buflen,
+ int rw)
+{
+ struct ata_port *ap = dev->link->ap;
+ void __iomem *data_addr = ap->ioaddr.data_addr;
+ unsigned long words;
+ int count;
+
+ words = buflen;
+ if (rw) {
+ count = 16;
+ while (words--) {
+ iowrite8(*buffer, data_addr);
+ buffer++;
+ /*
+ * Every 16 writes do a read so the bootbus
+ * FIFO doesn't fill up.
+ */
+ if (--count == 0) {
+ ioread8(ap->ioaddr.altstatus_addr);
+ count = 16;
+ }
+ }
+ } else {
+ ioread8_rep(data_addr, buffer, words);
+ }
+ return buflen;
+}
+
+/**
+ * Handle a 16 bit I/O request.
+ *
+ * @dev: Device to access
+ * @buffer: Data buffer
+ * @buflen: Length of the buffer.
+ * @rw: True to write.
+ */
+static unsigned int octeon_cf_data_xfer16(struct ata_device *dev,
+ unsigned char *buffer,
+ unsigned int buflen,
+ int rw)
+{
+ struct ata_port *ap = dev->link->ap;
+ void __iomem *data_addr = ap->ioaddr.data_addr;
+ unsigned long words;
+ int count;
+
+ words = buflen / 2;
+ if (rw) {
+ count = 16;
+ while (words--) {
+ iowrite16(*(uint16_t *)buffer, data_addr);
+ buffer += sizeof(uint16_t);
+ /*
+ * Every 16 writes do a read so the bootbus
+ * FIFO doesn't fill up.
+ */
+ if (--count == 0) {
+ ioread8(ap->ioaddr.altstatus_addr);
+ count = 16;
+ }
+ }
+ } else {
+ while (words--) {
+ *(uint16_t *)buffer = ioread16(data_addr);
+ buffer += sizeof(uint16_t);
+ }
+ }
+ /* Transfer trailing 1 byte, if any. */
+ if (unlikely(buflen & 0x01)) {
+ __le16 align_buf[1] = { 0 };
+
+ if (rw == READ) {
+ align_buf[0] = cpu_to_le16(ioread16(data_addr));
+ memcpy(buffer, align_buf, 1);
+ } else {
+ memcpy(align_buf, buffer, 1);
+ iowrite16(le16_to_cpu(align_buf[0]), data_addr);
+ }
+ words++;
+ }
+ return buflen;
+}
+
+/**
+ * Read the taskfile for 16bit non-True IDE only.
+ */
+static void octeon_cf_tf_read16(struct ata_port *ap, struct ata_taskfile *tf)
+{
+ u16 blob;
+ /* The base of the registers is at ioaddr.data_addr. */
+ void __iomem *base = ap->ioaddr.data_addr;
+
+ blob = __raw_readw(base + 0xc);
+ tf->feature = blob >> 8;
+
+ blob = __raw_readw(base + 2);
+ tf->nsect = blob & 0xff;
+ tf->lbal = blob >> 8;
+
+ blob = __raw_readw(base + 4);
+ tf->lbam = blob & 0xff;
+ tf->lbah = blob >> 8;
+
+ blob = __raw_readw(base + 6);
+ tf->device = blob & 0xff;
+ tf->command = blob >> 8;
+
+ if (tf->flags & ATA_TFLAG_LBA48) {
+ if (likely(ap->ioaddr.ctl_addr)) {
+ iowrite8(tf->ctl | ATA_HOB, ap->ioaddr.ctl_addr);
+
+ blob = __raw_readw(base + 0xc);
+ tf->hob_feature = blob >> 8;
+
+ blob = __raw_readw(base + 2);
+ tf->hob_nsect = blob & 0xff;
+ tf->hob_lbal = blob >> 8;
+
+ blob = __raw_readw(base + 4);
+ tf->hob_lbam = blob & 0xff;
+ tf->hob_lbah = blob >> 8;
+
+ iowrite8(tf->ctl, ap->ioaddr.ctl_addr);
+ ap->last_ctl = tf->ctl;
+ } else {
+ WARN_ON(1);
+ }
+ }
+}
+
+static u8 octeon_cf_check_status16(struct ata_port *ap)
+{
+ u16 blob;
+ void __iomem *base = ap->ioaddr.data_addr;
+
+ blob = __raw_readw(base + 6);
+ return blob >> 8;
+}
+
+static int octeon_cf_softreset16(struct ata_link *link, unsigned int *classes,
+ unsigned long deadline)
+{
+ struct ata_port *ap = link->ap;
+ void __iomem *base = ap->ioaddr.data_addr;
+ int rc;
+ u8 err;
+
+ DPRINTK("about to softreset\n");
+ __raw_writew(ap->ctl, base + 0xe);
+ udelay(20);
+ __raw_writew(ap->ctl | ATA_SRST, base + 0xe);
+ udelay(20);
+ __raw_writew(ap->ctl, base + 0xe);
+
+ rc = ata_sff_wait_after_reset(link, 1, deadline);
+ if (rc) {
+ ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
+ return rc;
+ }
+
+ /* determine by signature whether we have ATA or ATAPI devices */
+ classes[0] = ata_sff_dev_classify(&link->device[0], 1, &err);
+ DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
+ return 0;
+}
+
+/**
+ * Load the taskfile for 16bit non-True IDE only. The device_addr is
+ * not loaded, we do this as part of octeon_cf_exec_command16.
+ */
+static void octeon_cf_tf_load16(struct ata_port *ap,
+ const struct ata_taskfile *tf)
+{
+ unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+ /* The base of the registers is at ioaddr.data_addr. */
+ void __iomem *base = ap->ioaddr.data_addr;
+
+ if (tf->ctl != ap->last_ctl) {
+ iowrite8(tf->ctl, ap->ioaddr.ctl_addr);
+ ap->last_ctl = tf->ctl;
+ ata_wait_idle(ap);
+ }
+ if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+ __raw_writew(tf->hob_feature << 8, base + 0xc);
+ __raw_writew(tf->hob_nsect | tf->hob_lbal << 8, base + 2);
+ __raw_writew(tf->hob_lbam | tf->hob_lbah << 8, base + 4);
+ VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
+ tf->hob_feature,
+ tf->hob_nsect,
+ tf->hob_lbal,
+ tf->hob_lbam,
+ tf->hob_lbah);
+ }
+ if (is_addr) {
+ __raw_writew(tf->feature << 8, base + 0xc);
+ __raw_writew(tf->nsect | tf->lbal << 8, base + 2);
+ __raw_writew(tf->lbam | tf->lbah << 8, base + 4);
+ VPRINTK("feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
+ tf->feature,
+ tf->nsect,
+ tf->lbal,
+ tf->lbam,
+ tf->lbah);
+ }
+ ata_wait_idle(ap);
+}
+
+
+static void octeon_cf_dev_select(struct ata_port *ap, unsigned int device)
+{
+/* There is only one device, do nothing. */
+ return;
+}
+
+/*
+ * Issue ATA command to host controller. The device_addr is also sent
+ * as it must be written in a combined write with the command.
+ */
+static void octeon_cf_exec_command16(struct ata_port *ap,
+ const struct ata_taskfile *tf)
+{
+ /* The base of the registers is at ioaddr.data_addr. */
+ void __iomem *base = ap->ioaddr.data_addr;
+ u16 blob;
+
+ if (tf->flags & ATA_TFLAG_DEVICE) {
+ VPRINTK("device 0x%X\n", tf->device);
+ blob = tf->device;
+ } else {
+ blob = 0;
+ }
+
+ DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
+ blob |= (tf->command << 8);
+ __raw_writew(blob, base + 6);
+
+
+ ata_wait_idle(ap);
+}
+
+static u8 octeon_cf_irq_on(struct ata_port *ap)
+{
+ return 0;
+}
+
+static void octeon_cf_irq_clear(struct ata_port *ap)
+{
+ return;
+}
+
+static void octeon_cf_dma_setup(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct octeon_cf_port *cf_port;
+
+ cf_port = (struct octeon_cf_port *)ap->private_data;
+ DPRINTK("ENTER\n");
+ /* issue r/w command */
+ qc->cursg = qc->sg;
+ cf_port->dma_finished = 0;
+ ap->ops->sff_exec_command(ap, &qc->tf);
+ DPRINTK("EXIT\n");
+}
+
+/**
+ * Start a DMA transfer that was already setup
+ *
+ * @qc: Information about the DMA
+ */
+static void octeon_cf_dma_start(struct ata_queued_cmd *qc)
+{
+ struct octeon_cf_data *ocd = qc->ap->dev->platform_data;
+ union cvmx_mio_boot_dma_cfgx mio_boot_dma_cfg;
+ union cvmx_mio_boot_dma_intx mio_boot_dma_int;
+ struct scatterlist *sg;
+
+ VPRINTK("%d scatterlists\n", qc->n_elem);
+
+ /* Get the scatter list entry we need to DMA into */
+ sg = qc->cursg;
+ BUG_ON(!sg);
+
+ /*
+ * Clear the DMA complete status.
+ */
+ mio_boot_dma_int.u64 = 0;
+ mio_boot_dma_int.s.done = 1;
+ cvmx_write_csr(CVMX_MIO_BOOT_DMA_INTX(ocd->dma_engine),
+ mio_boot_dma_int.u64);
+
+ /* Enable the interrupt. */
+ cvmx_write_csr(CVMX_MIO_BOOT_DMA_INT_ENX(ocd->dma_engine),
+ mio_boot_dma_int.u64);
+
+ /* Set the direction of the DMA */
+ mio_boot_dma_cfg.u64 = 0;
+ mio_boot_dma_cfg.s.en = 1;
+ mio_boot_dma_cfg.s.rw = ((qc->tf.flags & ATA_TFLAG_WRITE) != 0);
+
+ /*
+ * Don't stop the DMA if the device deasserts DMARQ. Many
+ * compact flashes deassert DMARQ for a short time between
+ * sectors. Instead of stopping and restarting the DMA, we'll
+ * let the hardware do it. If the DMA is really stopped early
+ * due to an error condition, a later timeout will force us to
+ * stop.
+ */
+ mio_boot_dma_cfg.s.clr = 0;
+
+ /* Size is specified in 16bit words and minus one notation */
+ mio_boot_dma_cfg.s.size = sg_dma_len(sg) / 2 - 1;
+
+ /* We need to swap the high and low bytes of every 16 bits */
+ mio_boot_dma_cfg.s.swap8 = 1;
+
+ mio_boot_dma_cfg.s.adr = sg_dma_address(sg);
+
+ VPRINTK("%s %d bytes address=%p\n",
+ (mio_boot_dma_cfg.s.rw) ? "write" : "read", sg->length,
+ (void *)(unsigned long)mio_boot_dma_cfg.s.adr);
+
+ cvmx_write_csr(CVMX_MIO_BOOT_DMA_CFGX(ocd->dma_engine),
+ mio_boot_dma_cfg.u64);
+}
+
+/**
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ *
+ */
+static unsigned int octeon_cf_dma_finished(struct ata_port *ap,
+ struct ata_queued_cmd *qc)
+{
+ struct ata_eh_info *ehi = &ap->link.eh_info;
+ struct octeon_cf_data *ocd = ap->dev->platform_data;
+ union cvmx_mio_boot_dma_cfgx dma_cfg;
+ union cvmx_mio_boot_dma_intx dma_int;
+ struct octeon_cf_port *cf_port;
+ u8 status;
+
+ VPRINTK("ata%u: protocol %d task_state %d\n",
+ ap->print_id, qc->tf.protocol, ap->hsm_task_state);
+
+
+ if (ap->hsm_task_state != HSM_ST_LAST)
+ return 0;
+
+ cf_port = (struct octeon_cf_port *)ap->private_data;
+
+ dma_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_DMA_CFGX(ocd->dma_engine));
+ if (dma_cfg.s.size != 0xfffff) {
+ /* Error, the transfer was not complete. */
+ qc->err_mask |= AC_ERR_HOST_BUS;
+ ap->hsm_task_state = HSM_ST_ERR;
+ }
+
+ /* Stop and clear the dma engine. */
+ dma_cfg.u64 = 0;
+ dma_cfg.s.size = -1;
+ cvmx_write_csr(CVMX_MIO_BOOT_DMA_CFGX(ocd->dma_engine), dma_cfg.u64);
+
+ /* Disable the interrupt. */
+ dma_int.u64 = 0;
+ cvmx_write_csr(CVMX_MIO_BOOT_DMA_INT_ENX(ocd->dma_engine), dma_int.u64);
+
+ /* Clear the DMA complete status */
+ dma_int.s.done = 1;
+ cvmx_write_csr(CVMX_MIO_BOOT_DMA_INTX(ocd->dma_engine), dma_int.u64);
+
+ status = ap->ops->sff_check_status(ap);
+
+ ata_sff_hsm_move(ap, qc, status, 0);
+
+ if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA))
+ ata_ehi_push_desc(ehi, "DMA stat 0x%x", status);
+
+ return 1;
+}
+
+/*
+ * Check if any queued commands have more DMAs, if so start the next
+ * transfer, else do end of transfer handling.
+ */
+static irqreturn_t octeon_cf_interrupt(int irq, void *dev_instance)
+{
+ struct ata_host *host = dev_instance;
+ struct octeon_cf_port *cf_port;
+ int i;
+ unsigned int handled = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ DPRINTK("ENTER\n");
+ for (i = 0; i < host->n_ports; i++) {
+ u8 status;
+ struct ata_port *ap;
+ struct ata_queued_cmd *qc;
+ union cvmx_mio_boot_dma_intx dma_int;
+ union cvmx_mio_boot_dma_cfgx dma_cfg;
+ struct octeon_cf_data *ocd;
+
+ ap = host->ports[i];
+ ocd = ap->dev->platform_data;
+ if (!ap || (ap->flags & ATA_FLAG_DISABLED))
+ continue;
+
+ ocd = ap->dev->platform_data;
+ cf_port = (struct octeon_cf_port *)ap->private_data;
+ dma_int.u64 =
+ cvmx_read_csr(CVMX_MIO_BOOT_DMA_INTX(ocd->dma_engine));
+ dma_cfg.u64 =
+ cvmx_read_csr(CVMX_MIO_BOOT_DMA_CFGX(ocd->dma_engine));
+
+ qc = ata_qc_from_tag(ap, ap->link.active_tag);
+
+ if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
+ (qc->flags & ATA_QCFLAG_ACTIVE)) {
+ if (dma_int.s.done && !dma_cfg.s.en) {
+ if (!sg_is_last(qc->cursg)) {
+ qc->cursg = sg_next(qc->cursg);
+ handled = 1;
+ octeon_cf_dma_start(qc);
+ continue;
+ } else {
+ cf_port->dma_finished = 1;
+ }
+ }
+ if (!cf_port->dma_finished)
+ continue;
+ status = ioread8(ap->ioaddr.altstatus_addr);
+ if (status & (ATA_BUSY | ATA_DRQ)) {
+ /*
+ * We are busy, try to handle it
+ * later. This is the DMA finished
+ * interrupt, and it could take a
+ * little while for the card to be
+ * ready for more commands.
+ */
+ /* Clear DMA irq. */
+ dma_int.u64 = 0;
+ dma_int.s.done = 1;
+ cvmx_write_csr(CVMX_MIO_BOOT_DMA_INTX(ocd->dma_engine),
+ dma_int.u64);
+
+ queue_delayed_work(cf_port->wq,
+ &cf_port->delayed_finish, 1);
+ handled = 1;
+ } else {
+ handled |= octeon_cf_dma_finished(ap, qc);
+ }
+ }
+ }
+ spin_unlock_irqrestore(&host->lock, flags);
+ DPRINTK("EXIT\n");
+ return IRQ_RETVAL(handled);
+}
+
+static void octeon_cf_delayed_finish(struct work_struct *work)
+{
+ struct octeon_cf_port *cf_port = container_of(work,
+ struct octeon_cf_port,
+ delayed_finish.work);
+ struct ata_port *ap = cf_port->ap;
+ struct ata_host *host = ap->host;
+ struct ata_queued_cmd *qc;
+ unsigned long flags;
+ u8 status;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ /*
+ * If the port is not waiting for completion, it must have
+ * handled it previously. The hsm_task_state is
+ * protected by host->lock.
+ */
+ if (ap->hsm_task_state != HSM_ST_LAST || !cf_port->dma_finished)
+ goto out;
+
+ status = ioread8(ap->ioaddr.altstatus_addr);
+ if (status & (ATA_BUSY | ATA_DRQ)) {
+ /* Still busy, try again. */
+ queue_delayed_work(cf_port->wq,
+ &cf_port->delayed_finish, 1);
+ goto out;
+ }
+ qc = ata_qc_from_tag(ap, ap->link.active_tag);
+ if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
+ (qc->flags & ATA_QCFLAG_ACTIVE))
+ octeon_cf_dma_finished(ap, qc);
+out:
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void octeon_cf_dev_config(struct ata_device *dev)
+{
+ /*
+ * A maximum of 2^20 - 1 16 bit transfers are possible with
+ * the bootbus DMA. So we need to throttle max_sectors to
+ * (2^12 - 1 == 4095) to assure that this can never happen.
+ */
+ dev->max_sectors = min(dev->max_sectors, 4095U);
+}
+
+/*
+ * Trap if driver tries to do standard bmdma commands. They are not
+ * supported.
+ */
+static void unreachable_qc(struct ata_queued_cmd *qc)
+{
+ BUG();
+}
+
+static u8 unreachable_port(struct ata_port *ap)
+{
+ BUG();
+}
+
+/*
+ * We don't do ATAPI DMA so return 0.
+ */
+static int octeon_cf_check_atapi_dma(struct ata_queued_cmd *qc)
+{
+ return 0;
+}
+
+static unsigned int octeon_cf_qc_issue(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+
+ switch (qc->tf.protocol) {
+ case ATA_PROT_DMA:
+ WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
+
+ ap->ops->sff_tf_load(ap, &qc->tf); /* load tf registers */
+ octeon_cf_dma_setup(qc); /* set up dma */
+ octeon_cf_dma_start(qc); /* initiate dma */
+ ap->hsm_task_state = HSM_ST_LAST;
+ break;
+
+ case ATAPI_PROT_DMA:
+ dev_err(ap->dev, "Error, ATAPI not supported\n");
+ BUG();
+
+ default:
+ return ata_sff_qc_issue(qc);
+ }
+
+ return 0;
+}
+
+static struct ata_port_operations octeon_cf_ops = {
+ .inherits = &ata_sff_port_ops,
+ .check_atapi_dma = octeon_cf_check_atapi_dma,
+ .qc_prep = ata_noop_qc_prep,
+ .qc_issue = octeon_cf_qc_issue,
+ .sff_dev_select = octeon_cf_dev_select,
+ .sff_irq_on = octeon_cf_irq_on,
+ .sff_irq_clear = octeon_cf_irq_clear,
+ .bmdma_setup = unreachable_qc,
+ .bmdma_start = unreachable_qc,
+ .bmdma_stop = unreachable_qc,
+ .bmdma_status = unreachable_port,
+ .cable_detect = ata_cable_40wire,
+ .set_piomode = octeon_cf_set_piomode,
+ .set_dmamode = octeon_cf_set_dmamode,
+ .dev_config = octeon_cf_dev_config,
+};
+
+static int __devinit octeon_cf_probe(struct platform_device *pdev)
+{
+ struct resource *res_cs0, *res_cs1;
+
+ void __iomem *cs0;
+ void __iomem *cs1 = NULL;
+ struct ata_host *host;
+ struct ata_port *ap;
+ struct octeon_cf_data *ocd;
+ int irq = 0;
+ irq_handler_t irq_handler = NULL;
+ void __iomem *base;
+ struct octeon_cf_port *cf_port;
+
+ res_cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ if (!res_cs0)
+ return -EINVAL;
+
+ ocd = pdev->dev.platform_data;
+
+ cs0 = devm_ioremap_nocache(&pdev->dev, res_cs0->start,
+ res_cs0->end - res_cs0->start + 1);
+
+ if (!cs0)
+ return -ENOMEM;
+
+ /* Determine from availability of DMA if True IDE mode or not */
+ if (ocd->dma_engine >= 0) {
+ res_cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res_cs1)
+ return -EINVAL;
+
+ cs1 = devm_ioremap_nocache(&pdev->dev, res_cs1->start,
+ res_cs0->end - res_cs1->start + 1);
+
+ if (!cs1)
+ return -ENOMEM;
+ }
+
+ cf_port = kzalloc(sizeof(*cf_port), GFP_KERNEL);
+ if (!cf_port)
+ return -ENOMEM;
+
+ /* allocate host */
+ host = ata_host_alloc(&pdev->dev, 1);
+ if (!host)
+ goto free_cf_port;
+
+ ap = host->ports[0];
+ ap->private_data = cf_port;
+ cf_port->ap = ap;
+ ap->ops = &octeon_cf_ops;
+ ap->pio_mask = 0x7f; /* Support PIO 0-6 */
+ ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY
+ | ATA_FLAG_NO_ATAPI | ATA_FLAG_PIO_POLLING;
+
+ base = cs0 + ocd->base_region_bias;
+ if (!ocd->is16bit) {
+ ap->ioaddr.cmd_addr = base;
+ ata_sff_std_ports(&ap->ioaddr);
+
+ ap->ioaddr.altstatus_addr = base + 0xe;
+ ap->ioaddr.ctl_addr = base + 0xe;
+ octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer8;
+ } else if (cs1) {
+ /* Presence of cs1 indicates True IDE mode. */
+ ap->ioaddr.cmd_addr = base + (ATA_REG_CMD << 1) + 1;
+ ap->ioaddr.data_addr = base + (ATA_REG_DATA << 1);
+ ap->ioaddr.error_addr = base + (ATA_REG_ERR << 1) + 1;
+ ap->ioaddr.feature_addr = base + (ATA_REG_FEATURE << 1) + 1;
+ ap->ioaddr.nsect_addr = base + (ATA_REG_NSECT << 1) + 1;
+ ap->ioaddr.lbal_addr = base + (ATA_REG_LBAL << 1) + 1;
+ ap->ioaddr.lbam_addr = base + (ATA_REG_LBAM << 1) + 1;
+ ap->ioaddr.lbah_addr = base + (ATA_REG_LBAH << 1) + 1;
+ ap->ioaddr.device_addr = base + (ATA_REG_DEVICE << 1) + 1;
+ ap->ioaddr.status_addr = base + (ATA_REG_STATUS << 1) + 1;
+ ap->ioaddr.command_addr = base + (ATA_REG_CMD << 1) + 1;
+ ap->ioaddr.altstatus_addr = cs1 + (6 << 1) + 1;
+ ap->ioaddr.ctl_addr = cs1 + (6 << 1) + 1;
+ octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer16;
+
+ ap->mwdma_mask = 0x1f; /* Support MWDMA 0-4 */
+ irq = platform_get_irq(pdev, 0);
+ irq_handler = octeon_cf_interrupt;
+
+ /* True IDE mode needs delayed work to poll for not-busy. */
+ cf_port->wq = create_singlethread_workqueue(DRV_NAME);
+ if (!cf_port->wq)
+ goto free_cf_port;
+ INIT_DELAYED_WORK(&cf_port->delayed_finish,
+ octeon_cf_delayed_finish);
+
+ } else {
+ /* 16 bit but not True IDE */
+ octeon_cf_ops.sff_data_xfer = octeon_cf_data_xfer16;
+ octeon_cf_ops.softreset = octeon_cf_softreset16;
+ octeon_cf_ops.sff_check_status = octeon_cf_check_status16;
+ octeon_cf_ops.sff_tf_read = octeon_cf_tf_read16;
+ octeon_cf_ops.sff_tf_load = octeon_cf_tf_load16;
+ octeon_cf_ops.sff_exec_command = octeon_cf_exec_command16;
+
+ ap->ioaddr.data_addr = base + ATA_REG_DATA;
+ ap->ioaddr.nsect_addr = base + ATA_REG_NSECT;
+ ap->ioaddr.lbal_addr = base + ATA_REG_LBAL;
+ ap->ioaddr.ctl_addr = base + 0xe;
+ ap->ioaddr.altstatus_addr = base + 0xe;
+ }
+
+ ata_port_desc(ap, "cmd %p ctl %p", base, ap->ioaddr.ctl_addr);
+
+
+ dev_info(&pdev->dev, "version " DRV_VERSION" %d bit%s.\n",
+ (ocd->is16bit) ? 16 : 8,
+ (cs1) ? ", True IDE" : "");
+
+
+ return ata_host_activate(host, irq, irq_handler, 0, &octeon_cf_sht);
+
+free_cf_port:
+ kfree(cf_port);
+ return -ENOMEM;
+}
+
+static struct platform_driver octeon_cf_driver = {
+ .probe = octeon_cf_probe,
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init octeon_cf_init(void)
+{
+ return platform_driver_register(&octeon_cf_driver);
+}
+
+
+MODULE_AUTHOR("David Daney <ddaney@caviumnetworks.com>");
+MODULE_DESCRIPTION("low-level driver for Cavium OCTEON Compact Flash PATA");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_ALIAS("platform:" DRV_NAME);
+
+module_init(octeon_cf_init);