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>
This commit is contained in:
David Daney
Jeff Garzik
parent
3ada9c1264
commit
3c929c6f5a
@ -698,6 +698,15 @@ config PATA_IXP4XX_CF
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If unsure, say N.
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config PATA_OCTEON_CF
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tristate "OCTEON Boot Bus Compact Flash support"
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depends on CPU_CAVIUM_OCTEON
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help
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This option enables a polled compact flash driver for use with
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compact flash cards attached to the OCTEON boot bus.
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If unsure, say N.
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config PATA_SCC
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tristate "Toshiba's Cell Reference Set IDE support"
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depends on PCI && PPC_CELLEB
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@ -69,6 +69,7 @@ obj-$(CONFIG_PATA_IXP4XX_CF) += pata_ixp4xx_cf.o
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obj-$(CONFIG_PATA_SCC) += pata_scc.o
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obj-$(CONFIG_PATA_SCH) += pata_sch.o
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obj-$(CONFIG_PATA_BF54X) += pata_bf54x.o
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obj-$(CONFIG_PATA_OCTEON_CF) += pata_octeon_cf.o
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obj-$(CONFIG_PATA_PLATFORM) += pata_platform.o
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obj-$(CONFIG_PATA_OF_PLATFORM) += pata_of_platform.o
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obj-$(CONFIG_PATA_ICSIDE) += pata_icside.o
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965
drivers/ata/pata_octeon_cf.c
Normal file
965
drivers/ata/pata_octeon_cf.c
Normal file
@ -0,0 +1,965 @@
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/*
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* Driver for the Octeon bootbus compact flash.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2005 - 2009 Cavium Networks
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* Copyright (C) 2008 Wind River Systems
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/libata.h>
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#include <linux/irq.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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#include <scsi/scsi_host.h>
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#include <asm/octeon/octeon.h>
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/*
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* The Octeon bootbus compact flash interface is connected in at least
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* 3 different configurations on various evaluation boards:
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*
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* -- 8 bits no irq, no DMA
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* -- 16 bits no irq, no DMA
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* -- 16 bits True IDE mode with DMA, but no irq.
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*
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* In the last case the DMA engine can generate an interrupt when the
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* transfer is complete. For the first two cases only PIO is supported.
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*
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*/
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#define DRV_NAME "pata_octeon_cf"
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#define DRV_VERSION "2.1"
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struct octeon_cf_port {
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struct workqueue_struct *wq;
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struct delayed_work delayed_finish;
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struct ata_port *ap;
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int dma_finished;
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};
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static struct scsi_host_template octeon_cf_sht = {
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ATA_PIO_SHT(DRV_NAME),
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};
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/**
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* Convert nanosecond based time to setting used in the
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* boot bus timing register, based on timing multiple
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*/
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static unsigned int ns_to_tim_reg(unsigned int tim_mult, unsigned int nsecs)
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{
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unsigned int val;
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/*
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* Compute # of eclock periods to get desired duration in
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* nanoseconds.
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*/
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val = DIV_ROUND_UP(nsecs * (octeon_get_clock_rate() / 1000000),
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1000 * tim_mult);
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return val;
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}
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static void octeon_cf_set_boot_reg_cfg(int cs)
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{
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union cvmx_mio_boot_reg_cfgx reg_cfg;
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reg_cfg.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_CFGX(cs));
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reg_cfg.s.dmack = 0; /* Don't assert DMACK on access */
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reg_cfg.s.tim_mult = 2; /* Timing mutiplier 2x */
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reg_cfg.s.rd_dly = 0; /* Sample on falling edge of BOOT_OE */
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reg_cfg.s.sam = 0; /* Don't combine write and output enable */
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reg_cfg.s.we_ext = 0; /* No write enable extension */
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reg_cfg.s.oe_ext = 0; /* No read enable extension */
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reg_cfg.s.en = 1; /* Enable this region */
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reg_cfg.s.orbit = 0; /* Don't combine with previous region */
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reg_cfg.s.ale = 0; /* Don't do address multiplexing */
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cvmx_write_csr(CVMX_MIO_BOOT_REG_CFGX(cs), reg_cfg.u64);
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}
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/**
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* Called after libata determines the needed PIO mode. This
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* function programs the Octeon bootbus regions to support the
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* timing requirements of the PIO mode.
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*
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* @ap: ATA port information
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* @dev: ATA device
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*/
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static void octeon_cf_set_piomode(struct ata_port *ap, struct ata_device *dev)
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{
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struct octeon_cf_data *ocd = ap->dev->platform_data;
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union cvmx_mio_boot_reg_timx reg_tim;
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int cs = ocd->base_region;
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int T;
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struct ata_timing timing;
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int use_iordy;
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int trh;
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int pause;
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/* These names are timing parameters from the ATA spec */
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int t1;
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int t2;
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int t2i;
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T = (int)(2000000000000LL / octeon_get_clock_rate());
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if (ata_timing_compute(dev, dev->pio_mode, &timing, T, T))
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BUG();
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t1 = timing.setup;
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if (t1)
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t1--;
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t2 = timing.active;
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if (t2)
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t2--;
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t2i = timing.act8b;
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if (t2i)
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t2i--;
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trh = ns_to_tim_reg(2, 20);
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if (trh)
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trh--;
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pause = timing.cycle - timing.active - timing.setup - trh;
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if (pause)
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pause--;
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octeon_cf_set_boot_reg_cfg(cs);
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if (ocd->dma_engine >= 0)
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/* True IDE mode, program both chip selects. */
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octeon_cf_set_boot_reg_cfg(cs + 1);
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use_iordy = ata_pio_need_iordy(dev);
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reg_tim.u64 = cvmx_read_csr(CVMX_MIO_BOOT_REG_TIMX(cs));
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/* Disable page mode */
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reg_tim.s.pagem = 0;
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/* Enable dynamic timing */
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reg_tim.s.waitm = use_iordy;
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/* Pages are disabled */
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reg_tim.s.pages = 0;
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/* We don't use multiplexed address mode */
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reg_tim.s.ale = 0;
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/* Not used */
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reg_tim.s.page = 0;
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/* Time after IORDY to coninue to assert the data */
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reg_tim.s.wait = 0;
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/* Time to wait to complete the cycle. */
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reg_tim.s.pause = pause;
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/* How long to hold after a write to de-assert CE. */
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reg_tim.s.wr_hld = trh;
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/* How long to wait after a read to de-assert CE. */
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reg_tim.s.rd_hld = trh;
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/* How long write enable is asserted */
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reg_tim.s.we = t2;
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/* How long read enable is asserted */
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reg_tim.s.oe = t2;
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/* Time after CE that read/write starts */
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reg_tim.s.ce = ns_to_tim_reg(2, 5);
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/* Time before CE that address is valid */
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reg_tim.s.adr = 0;
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/* Program the bootbus region timing for the data port chip select. */
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cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cs), reg_tim.u64);
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if (ocd->dma_engine >= 0)
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/* True IDE mode, program both chip selects. */
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cvmx_write_csr(CVMX_MIO_BOOT_REG_TIMX(cs + 1), reg_tim.u64);
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}
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static void octeon_cf_set_dmamode(struct ata_port *ap, struct ata_device *dev)
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{
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struct octeon_cf_data *ocd = dev->link->ap->dev->platform_data;
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union cvmx_mio_boot_dma_timx dma_tim;
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unsigned int oe_a;
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unsigned int oe_n;
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unsigned int dma_ackh;
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unsigned int dma_arq;
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unsigned int pause;
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unsigned int T0, Tkr, Td;
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unsigned int tim_mult;
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const struct ata_timing *timing;
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timing = ata_timing_find_mode(dev->dma_mode);
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T0 = timing->cycle;
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Td = timing->active;
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Tkr = timing->recover;
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dma_ackh = timing->dmack_hold;
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dma_tim.u64 = 0;
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/* dma_tim.s.tim_mult = 0 --> 4x */
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tim_mult = 4;
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/* not spec'ed, value in eclocks, not affected by tim_mult */
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dma_arq = 8;
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pause = 25 - dma_arq * 1000 /
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(octeon_get_clock_rate() / 1000000); /* Tz */
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oe_a = Td;
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/* Tkr from cf spec, lengthened to meet T0 */
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oe_n = max(T0 - oe_a, Tkr);
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dma_tim.s.dmack_pi = 1;
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dma_tim.s.oe_n = ns_to_tim_reg(tim_mult, oe_n);
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dma_tim.s.oe_a = ns_to_tim_reg(tim_mult, oe_a);
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/*
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* This is tI, C.F. spec. says 0, but Sony CF card requires
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* more, we use 20 nS.
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*/
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dma_tim.s.dmack_s = ns_to_tim_reg(tim_mult, 20);;
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dma_tim.s.dmack_h = ns_to_tim_reg(tim_mult, dma_ackh);
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dma_tim.s.dmarq = dma_arq;
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dma_tim.s.pause = ns_to_tim_reg(tim_mult, pause);
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dma_tim.s.rd_dly = 0; /* Sample right on edge */
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/* writes only */
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dma_tim.s.we_n = ns_to_tim_reg(tim_mult, oe_n);
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dma_tim.s.we_a = ns_to_tim_reg(tim_mult, oe_a);
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pr_debug("ns to ticks (mult %d) of %d is: %d\n", tim_mult, 60,
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ns_to_tim_reg(tim_mult, 60));
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pr_debug("oe_n: %d, oe_a: %d, dmack_s: %d, dmack_h: "
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"%d, dmarq: %d, pause: %d\n",
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dma_tim.s.oe_n, dma_tim.s.oe_a, dma_tim.s.dmack_s,
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dma_tim.s.dmack_h, dma_tim.s.dmarq, dma_tim.s.pause);
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cvmx_write_csr(CVMX_MIO_BOOT_DMA_TIMX(ocd->dma_engine),
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dma_tim.u64);
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}
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/**
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* Handle an 8 bit I/O request.
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*
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* @dev: Device to access
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* @buffer: Data buffer
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* @buflen: Length of the buffer.
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* @rw: True to write.
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*/
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static unsigned int octeon_cf_data_xfer8(struct ata_device *dev,
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unsigned char *buffer,
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unsigned int buflen,
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int rw)
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{
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struct ata_port *ap = dev->link->ap;
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void __iomem *data_addr = ap->ioaddr.data_addr;
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unsigned long words;
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int count;
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words = buflen;
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if (rw) {
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count = 16;
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while (words--) {
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iowrite8(*buffer, data_addr);
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buffer++;
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/*
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* Every 16 writes do a read so the bootbus
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* FIFO doesn't fill up.
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*/
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if (--count == 0) {
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ioread8(ap->ioaddr.altstatus_addr);
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count = 16;
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}
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}
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} else {
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ioread8_rep(data_addr, buffer, words);
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}
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return buflen;
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}
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/**
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* Handle a 16 bit I/O request.
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*
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* @dev: Device to access
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* @buffer: Data buffer
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* @buflen: Length of the buffer.
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* @rw: True to write.
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*/
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static unsigned int octeon_cf_data_xfer16(struct ata_device *dev,
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unsigned char *buffer,
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unsigned int buflen,
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int rw)
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{
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struct ata_port *ap = dev->link->ap;
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void __iomem *data_addr = ap->ioaddr.data_addr;
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unsigned long words;
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int count;
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words = buflen / 2;
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if (rw) {
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count = 16;
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while (words--) {
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iowrite16(*(uint16_t *)buffer, data_addr);
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buffer += sizeof(uint16_t);
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/*
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* Every 16 writes do a read so the bootbus
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* FIFO doesn't fill up.
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*/
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if (--count == 0) {
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ioread8(ap->ioaddr.altstatus_addr);
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count = 16;
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}
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}
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} else {
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while (words--) {
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*(uint16_t *)buffer = ioread16(data_addr);
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buffer += sizeof(uint16_t);
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}
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}
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/* Transfer trailing 1 byte, if any. */
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if (unlikely(buflen & 0x01)) {
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__le16 align_buf[1] = { 0 };
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if (rw == READ) {
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align_buf[0] = cpu_to_le16(ioread16(data_addr));
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memcpy(buffer, align_buf, 1);
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} else {
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memcpy(align_buf, buffer, 1);
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iowrite16(le16_to_cpu(align_buf[0]), data_addr);
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}
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words++;
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}
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return buflen;
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}
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/**
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* Read the taskfile for 16bit non-True IDE only.
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*/
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static void octeon_cf_tf_read16(struct ata_port *ap, struct ata_taskfile *tf)
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{
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u16 blob;
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/* The base of the registers is at ioaddr.data_addr. */
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void __iomem *base = ap->ioaddr.data_addr;
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blob = __raw_readw(base + 0xc);
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tf->feature = blob >> 8;
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blob = __raw_readw(base + 2);
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tf->nsect = blob & 0xff;
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tf->lbal = blob >> 8;
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blob = __raw_readw(base + 4);
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tf->lbam = blob & 0xff;
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tf->lbah = blob >> 8;
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blob = __raw_readw(base + 6);
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tf->device = blob & 0xff;
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tf->command = blob >> 8;
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if (tf->flags & ATA_TFLAG_LBA48) {
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if (likely(ap->ioaddr.ctl_addr)) {
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iowrite8(tf->ctl | ATA_HOB, ap->ioaddr.ctl_addr);
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blob = __raw_readw(base + 0xc);
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tf->hob_feature = blob >> 8;
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blob = __raw_readw(base + 2);
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tf->hob_nsect = blob & 0xff;
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tf->hob_lbal = blob >> 8;
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blob = __raw_readw(base + 4);
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tf->hob_lbam = blob & 0xff;
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tf->hob_lbah = blob >> 8;
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iowrite8(tf->ctl, ap->ioaddr.ctl_addr);
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ap->last_ctl = tf->ctl;
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} else {
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WARN_ON(1);
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}
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}
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}
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static u8 octeon_cf_check_status16(struct ata_port *ap)
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{
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u16 blob;
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void __iomem *base = ap->ioaddr.data_addr;
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blob = __raw_readw(base + 6);
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return blob >> 8;
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}
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static int octeon_cf_softreset16(struct ata_link *link, unsigned int *classes,
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unsigned long deadline)
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{
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struct ata_port *ap = link->ap;
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void __iomem *base = ap->ioaddr.data_addr;
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int rc;
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u8 err;
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DPRINTK("about to softreset\n");
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__raw_writew(ap->ctl, base + 0xe);
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udelay(20);
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__raw_writew(ap->ctl | ATA_SRST, base + 0xe);
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udelay(20);
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__raw_writew(ap->ctl, base + 0xe);
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rc = ata_sff_wait_after_reset(link, 1, deadline);
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if (rc) {
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ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
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return rc;
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}
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/* determine by signature whether we have ATA or ATAPI devices */
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classes[0] = ata_sff_dev_classify(&link->device[0], 1, &err);
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DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
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return 0;
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}
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/**
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* Load the taskfile for 16bit non-True IDE only. The device_addr is
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* not loaded, we do this as part of octeon_cf_exec_command16.
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*/
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static void octeon_cf_tf_load16(struct ata_port *ap,
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const struct ata_taskfile *tf)
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{
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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);
|
||||
Loading…
Reference in New Issue
Block a user