/* * pdc_adma.c - Pacific Digital Corporation ADMA * * Maintained by: Tejun Heo <tj@kernel.org> * * Copyright 2005 Mark Lord * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; see the file COPYING. If not, write to * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. * * * libata documentation is available via 'make {ps|pdf}docs', * as Documentation/DocBook/libata.* * * * Supports ATA disks in single-packet ADMA mode. * Uses PIO for everything else. * * TODO: Use ADMA transfers for ATAPI devices, when possible. * This requires careful attention to a number of quirks of the chip. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/gfp.h> #include <linux/pci.h> #include <linux/blkdev.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/device.h> #include <scsi/scsi_host.h> #include <linux/libata.h> #define DRV_NAME "pdc_adma" #define DRV_VERSION "1.0" /* macro to calculate base address for ATA regs */ #define ADMA_ATA_REGS(base, port_no) ((base) + ((port_no) * 0x40)) /* macro to calculate base address for ADMA regs */ #define ADMA_REGS(base, port_no) ((base) + 0x80 + ((port_no) * 0x20)) /* macro to obtain addresses from ata_port */ #define ADMA_PORT_REGS(ap) \ ADMA_REGS((ap)->host->iomap[ADMA_MMIO_BAR], ap->port_no) enum { ADMA_MMIO_BAR = 4, ADMA_PORTS = 2, ADMA_CPB_BYTES = 40, ADMA_PRD_BYTES = LIBATA_MAX_PRD * 16, ADMA_PKT_BYTES = ADMA_CPB_BYTES + ADMA_PRD_BYTES, ADMA_DMA_BOUNDARY = 0xffffffff, /* global register offsets */ ADMA_MODE_LOCK = 0x00c7, /* per-channel register offsets */ ADMA_CONTROL = 0x0000, /* ADMA control */ ADMA_STATUS = 0x0002, /* ADMA status */ ADMA_CPB_COUNT = 0x0004, /* CPB count */ ADMA_CPB_CURRENT = 0x000c, /* current CPB address */ ADMA_CPB_NEXT = 0x000c, /* next CPB address */ ADMA_CPB_LOOKUP = 0x0010, /* CPB lookup table */ ADMA_FIFO_IN = 0x0014, /* input FIFO threshold */ ADMA_FIFO_OUT = 0x0016, /* output FIFO threshold */ /* ADMA_CONTROL register bits */ aNIEN = (1 << 8), /* irq mask: 1==masked */ aGO = (1 << 7), /* packet trigger ("Go!") */ aRSTADM = (1 << 5), /* ADMA logic reset */ aPIOMD4 = 0x0003, /* PIO mode 4 */ /* ADMA_STATUS register bits */ aPSD = (1 << 6), aUIRQ = (1 << 4), aPERR = (1 << 0), /* CPB bits */ cDONE = (1 << 0), cATERR = (1 << 3), cVLD = (1 << 0), cDAT = (1 << 2), cIEN = (1 << 3), /* PRD bits */ pORD = (1 << 4), pDIRO = (1 << 5), pEND = (1 << 7), /* ATA register flags */ rIGN = (1 << 5), rEND = (1 << 7), /* ATA register addresses */ ADMA_REGS_CONTROL = 0x0e, ADMA_REGS_SECTOR_COUNT = 0x12, ADMA_REGS_LBA_LOW = 0x13, ADMA_REGS_LBA_MID = 0x14, ADMA_REGS_LBA_HIGH = 0x15, ADMA_REGS_DEVICE = 0x16, ADMA_REGS_COMMAND = 0x17, /* PCI device IDs */ board_1841_idx = 0, /* ADMA 2-port controller */ }; typedef enum { adma_state_idle, adma_state_pkt, adma_state_mmio } adma_state_t; struct adma_port_priv { u8 *pkt; dma_addr_t pkt_dma; adma_state_t state; }; static int adma_ata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent); static int adma_port_start(struct ata_port *ap); static void adma_port_stop(struct ata_port *ap); static void adma_qc_prep(struct ata_queued_cmd *qc); static unsigned int adma_qc_issue(struct ata_queued_cmd *qc); static int adma_check_atapi_dma(struct ata_queued_cmd *qc); static void adma_freeze(struct ata_port *ap); static void adma_thaw(struct ata_port *ap); static int adma_prereset(struct ata_link *link, unsigned long deadline); static struct scsi_host_template adma_ata_sht = { ATA_BASE_SHT(DRV_NAME), .sg_tablesize = LIBATA_MAX_PRD, .dma_boundary = ADMA_DMA_BOUNDARY, }; static struct ata_port_operations adma_ata_ops = { .inherits = &ata_sff_port_ops, .lost_interrupt = ATA_OP_NULL, .check_atapi_dma = adma_check_atapi_dma, .qc_prep = adma_qc_prep, .qc_issue = adma_qc_issue, .freeze = adma_freeze, .thaw = adma_thaw, .prereset = adma_prereset, .port_start = adma_port_start, .port_stop = adma_port_stop, }; static struct ata_port_info adma_port_info[] = { /* board_1841_idx */ { .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_POLLING, .pio_mask = ATA_PIO4_ONLY, .udma_mask = ATA_UDMA4, .port_ops = &adma_ata_ops, }, }; static const struct pci_device_id adma_ata_pci_tbl[] = { { PCI_VDEVICE(PDC, 0x1841), board_1841_idx }, { } /* terminate list */ }; static struct pci_driver adma_ata_pci_driver = { .name = DRV_NAME, .id_table = adma_ata_pci_tbl, .probe = adma_ata_init_one, .remove = ata_pci_remove_one, }; static int adma_check_atapi_dma(struct ata_queued_cmd *qc) { return 1; /* ATAPI DMA not yet supported */ } static void adma_reset_engine(struct ata_port *ap) { void __iomem *chan = ADMA_PORT_REGS(ap); /* reset ADMA to idle state */ writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL); udelay(2); writew(aPIOMD4, chan + ADMA_CONTROL); udelay(2); } static void adma_reinit_engine(struct ata_port *ap) { struct adma_port_priv *pp = ap->private_data; void __iomem<style> @media only all and (prefers-color-scheme: dark) { .highlight .hll { background-color: #49483e } .highlight .c { color: #75715e } /* Comment */ .highlight .err { color: #960050; 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