diff options
Diffstat (limited to 'drivers/ide/trm290.c')
| -rw-r--r-- | drivers/ide/trm290.c | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/drivers/ide/trm290.c b/drivers/ide/trm290.c new file mode 100644 index 00000000000..75ea6152656 --- /dev/null +++ b/drivers/ide/trm290.c @@ -0,0 +1,375 @@ +/* + * Copyright (c) 1997-1998 Mark Lord + * Copyright (c) 2007 MontaVista Software, Inc. <source@mvista.com> + * + * May be copied or modified under the terms of the GNU General Public License + * + * June 22, 2004 - get rid of check_region + * - Jesper Juhl + * + */ + +/* + * This module provides support for the bus-master IDE DMA function + * of the Tekram TRM290 chip, used on a variety of PCI IDE add-on boards, + * including a "Precision Instruments" board. The TRM290 pre-dates + * the sff-8038 standard (ide-dma.c) by a few months, and differs + * significantly enough to warrant separate routines for some functions, + * while re-using others from ide-dma.c. + * + * EXPERIMENTAL! It works for me (a sample of one). + * + * Works reliably for me in DMA mode (READs only), + * DMA WRITEs are disabled by default (see #define below); + * + * DMA is not enabled automatically for this chipset, + * but can be turned on manually (with "hdparm -d1") at run time. + * + * I need volunteers with "spare" drives for further testing + * and development, and maybe to help figure out the peculiarities. + * Even knowing the registers (below), some things behave strangely. + */ + +#define TRM290_NO_DMA_WRITES /* DMA writes seem unreliable sometimes */ + +/* + * TRM-290 PCI-IDE2 Bus Master Chip + * ================================ + * The configuration registers are addressed in normal I/O port space + * and are used as follows: + * + * trm290_base depends on jumper settings, and is probed for by ide-dma.c + * + * trm290_base+2 when WRITTEN: chiptest register (byte, write-only) + * bit7 must always be written as "1" + * bits6-2 undefined + * bit1 1=legacy_compatible_mode, 0=native_pci_mode + * bit0 1=test_mode, 0=normal(default) + * + * trm290_base+2 when READ: status register (byte, read-only) + * bits7-2 undefined + * bit1 channel0 busmaster interrupt status 0=none, 1=asserted + * bit0 channel0 interrupt status 0=none, 1=asserted + * + * trm290_base+3 Interrupt mask register + * bits7-5 undefined + * bit4 legacy_header: 1=present, 0=absent + * bit3 channel1 busmaster interrupt status 0=none, 1=asserted (read only) + * bit2 channel1 interrupt status 0=none, 1=asserted (read only) + * bit1 channel1 interrupt mask: 1=masked, 0=unmasked(default) + * bit0 channel0 interrupt mask: 1=masked, 0=unmasked(default) + * + * trm290_base+1 "CPR" Config Pointer Register (byte) + * bit7 1=autoincrement CPR bits 2-0 after each access of CDR + * bit6 1=min. 1 wait-state posted write cycle (default), 0=0 wait-state + * bit5 0=enabled master burst access (default), 1=disable (write only) + * bit4 PCI DEVSEL# timing select: 1=medium(default), 0=fast + * bit3 0=primary IDE channel, 1=secondary IDE channel + * bits2-0 register index for accesses through CDR port + * + * trm290_base+0 "CDR" Config Data Register (word) + * two sets of seven config registers, + * selected by CPR bit 3 (channel) and CPR bits 2-0 (index 0 to 6), + * each index defined below: + * + * Index-0 Base address register for command block (word) + * defaults: 0x1f0 for primary, 0x170 for secondary + * + * Index-1 general config register (byte) + * bit7 1=DMA enable, 0=DMA disable + * bit6 1=activate IDE_RESET, 0=no action (default) + * bit5 1=enable IORDY, 0=disable IORDY (default) + * bit4 0=16-bit data port(default), 1=8-bit (XT) data port + * bit3 interrupt polarity: 1=active_low, 0=active_high(default) + * bit2 power-saving-mode(?): 1=enable, 0=disable(default) (write only) + * bit1 bus_master_mode(?): 1=enable, 0=disable(default) + * bit0 enable_io_ports: 1=enable(default), 0=disable + * + * Index-2 read-ahead counter preload bits 0-7 (byte, write only) + * bits7-0 bits7-0 of readahead count + * + * Index-3 read-ahead config register (byte, write only) + * bit7 1=enable_readahead, 0=disable_readahead(default) + * bit6 1=clear_FIFO, 0=no_action + * bit5 undefined + * bit4 mode4 timing control: 1=enable, 0=disable(default) + * bit3 undefined + * bit2 undefined + * bits1-0 bits9-8 of read-ahead count + * + * Index-4 base address register for control block (word) + * defaults: 0x3f6 for primary, 0x376 for secondary + * + * Index-5 data port timings (shared by both drives) (byte) + * standard PCI "clk" (clock) counts, default value = 0xf5 + * + * bits7-6 setup time: 00=1clk, 01=2clk, 10=3clk, 11=4clk + * bits5-3 hold time: 000=1clk, 001=2clk, 010=3clk, + * 011=4clk, 100=5clk, 101=6clk, + * 110=8clk, 111=12clk + * bits2-0 active time: 000=2clk, 001=3clk, 010=4clk, + * 011=5clk, 100=6clk, 101=8clk, + * 110=12clk, 111=16clk + * + * Index-6 command/control port timings (shared by both drives) (byte) + * same layout as Index-5, default value = 0xde + * + * Suggested CDR programming for PIO mode0 (600ns): + * 0x01f0,0x21,0xff,0x80,0x03f6,0xf5,0xde ; primary + * 0x0170,0x21,0xff,0x80,0x0376,0xf5,0xde ; secondary + * + * Suggested CDR programming for PIO mode3 (180ns): + * 0x01f0,0x21,0xff,0x80,0x03f6,0x09,0xde ; primary + * 0x0170,0x21,0xff,0x80,0x0376,0x09,0xde ; secondary + * + * Suggested CDR programming for PIO mode4 (120ns): + * 0x01f0,0x21,0xff,0x80,0x03f6,0x00,0xde ; primary + * 0x0170,0x21,0xff,0x80,0x0376,0x00,0xde ; secondary + * + */ + +#include <linux/types.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/blkdev.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/ide.h> + +#include <asm/io.h> + +#define DRV_NAME "trm290" + +static void trm290_prepare_drive (ide_drive_t *drive, unsigned int use_dma) +{ + ide_hwif_t *hwif = HWIF(drive); + u16 reg = 0; + unsigned long flags; + + /* select PIO or DMA */ + reg = use_dma ? (0x21 | 0x82) : (0x21 & ~0x82); + + local_irq_save(flags); + + if (reg != hwif->select_data) { + hwif->select_data = reg; + /* set PIO/DMA */ + outb(0x51 | (hwif->channel << 3), hwif->config_data + 1); + outw(reg & 0xff, hwif->config_data); + } + + /* enable IRQ if not probing */ + if (drive->dev_flags & IDE_DFLAG_PRESENT) { + reg = inw(hwif->config_data + 3); + reg &= 0x13; + reg &= ~(1 << hwif->channel); + outw(reg, hwif->config_data + 3); + } + + local_irq_restore(flags); +} + +static void trm290_selectproc (ide_drive_t *drive) +{ + trm290_prepare_drive(drive, !!(drive->dev_flags & IDE_DFLAG_USING_DMA)); +} + +static void trm290_dma_exec_cmd(ide_drive_t *drive, u8 command) +{ + ide_execute_command(drive, command, &ide_dma_intr, WAIT_CMD, NULL); +} + +static int trm290_dma_setup(ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + struct request *rq = hwif->hwgroup->rq; + unsigned int count, rw; + + if (rq_data_dir(rq)) { +#ifdef TRM290_NO_DMA_WRITES + /* always use PIO for writes */ + trm290_prepare_drive(drive, 0); /* select PIO xfer */ + return 1; +#endif + rw = 1; + } else + rw = 2; + + if (!(count = ide_build_dmatable(drive, rq))) { + /* try PIO instead of DMA */ + trm290_prepare_drive(drive, 0); /* select PIO xfer */ + return 1; + } + /* select DMA xfer */ + trm290_prepare_drive(drive, 1); + outl(hwif->dmatable_dma | rw, hwif->dma_base); + drive->waiting_for_dma = 1; + /* start DMA */ + outw(count * 2 - 1, hwif->dma_base + 2); + return 0; +} + +static void trm290_dma_start(ide_drive_t *drive) +{ +} + +static int trm290_dma_end(ide_drive_t *drive) +{ + u16 status; + + drive->waiting_for_dma = 0; + /* purge DMA mappings */ + ide_destroy_dmatable(drive); + status = inw(HWIF(drive)->dma_base + 2); + return status != 0x00ff; +} + +static int trm290_dma_test_irq(ide_drive_t *drive) +{ + u16 status; + + status = inw(HWIF(drive)->dma_base + 2); + return status == 0x00ff; +} + +static void trm290_dma_host_set(ide_drive_t *drive, int on) +{ +} + +static void __devinit init_hwif_trm290(ide_hwif_t *hwif) +{ + struct pci_dev *dev = to_pci_dev(hwif->dev); + unsigned int cfg_base = pci_resource_start(dev, 4); + unsigned long flags; + u8 reg = 0; + + if ((dev->class & 5) && cfg_base) + printk(KERN_INFO DRV_NAME " %s: chip", pci_name(dev)); + else { + cfg_base = 0x3df0; + printk(KERN_INFO DRV_NAME " %s: using default", pci_name(dev)); + } + printk(KERN_CONT " config base at 0x%04x\n", cfg_base); + hwif->config_data = cfg_base; + hwif->dma_base = (cfg_base + 4) ^ (hwif->channel ? 0x80 : 0); + + printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx\n", + hwif->name, hwif->dma_base, hwif->dma_base + 3); + + if (ide_allocate_dma_engine(hwif)) + return; + + local_irq_save(flags); + /* put config reg into first byte of hwif->select_data */ + outb(0x51 | (hwif->channel << 3), hwif->config_data + 1); + /* select PIO as default */ + hwif->select_data = 0x21; + outb(hwif->select_data, hwif->config_data); + /* get IRQ info */ + reg = inb(hwif->config_data + 3); + /* mask IRQs for both ports */ + reg = (reg & 0x10) | 0x03; + outb(reg, hwif->config_data + 3); + local_irq_restore(flags); + + if (reg & 0x10) + /* legacy mode */ + hwif->irq = hwif->channel ? 15 : 14; + else if (!hwif->irq && hwif->mate && hwif->mate->irq) + /* sharing IRQ with mate */ + hwif->irq = hwif->mate->irq; + +#if 1 + { + /* + * My trm290-based card doesn't seem to work with all possible values + * for the control basereg, so this kludge ensures that we use only + * values that are known to work. Ugh. -ml + */ + u16 new, old, compat = hwif->channel ? 0x374 : 0x3f4; + static u16 next_offset = 0; + u8 old_mask; + + outb(0x54 | (hwif->channel << 3), hwif->config_data + 1); + old = inw(hwif->config_data); + old &= ~1; + old_mask = inb(old + 2); + if (old != compat && old_mask == 0xff) { + /* leave lower 10 bits untouched */ + compat += (next_offset += 0x400); + hwif->io_ports.ctl_addr = compat + 2; + outw(compat | 1, hwif->config_data); + new = inw(hwif->config_data); + printk(KERN_INFO "%s: control basereg workaround: " + "old=0x%04x, new=0x%04x\n", + hwif->name, old, new & ~1); + } + } +#endif +} + +static const struct ide_port_ops trm290_port_ops = { + .selectproc = trm290_selectproc, +}; + +static struct ide_dma_ops trm290_dma_ops = { + .dma_host_set = trm290_dma_host_set, + .dma_setup = trm290_dma_setup, + .dma_exec_cmd = trm290_dma_exec_cmd, + .dma_start = trm290_dma_start, + .dma_end = trm290_dma_end, + .dma_test_irq = trm290_dma_test_irq, + .dma_lost_irq = ide_dma_lost_irq, + .dma_timeout = ide_dma_timeout, +}; + +static const struct ide_port_info trm290_chipset __devinitdata = { + .name = DRV_NAME, + .init_hwif = init_hwif_trm290, + .chipset = ide_trm290, + .port_ops = &trm290_port_ops, + .dma_ops = &trm290_dma_ops, + .host_flags = IDE_HFLAG_NO_ATAPI_DMA | +#if 0 /* play it safe for now */ + IDE_HFLAG_TRUST_BIOS_FOR_DMA | +#endif + IDE_HFLAG_NO_AUTODMA | + IDE_HFLAG_NO_LBA48, +}; + +static int __devinit trm290_init_one(struct pci_dev *dev, const struct pci_device_id *id) +{ + return ide_pci_init_one(dev, &trm290_chipset, NULL); +} + +static const struct pci_device_id trm290_pci_tbl[] = { + { PCI_VDEVICE(TEKRAM, PCI_DEVICE_ID_TEKRAM_DC290), 0 }, + { 0, }, +}; +MODULE_DEVICE_TABLE(pci, trm290_pci_tbl); + +static struct pci_driver trm290_pci_driver = { + .name = "TRM290_IDE", + .id_table = trm290_pci_tbl, + .probe = trm290_init_one, + .remove = ide_pci_remove, +}; + +static int __init trm290_ide_init(void) +{ + return ide_pci_register_driver(&trm290_pci_driver); +} + +static void __exit trm290_ide_exit(void) +{ + pci_unregister_driver(&trm290_pci_driver); +} + +module_init(trm290_ide_init); +module_exit(trm290_ide_exit); + +MODULE_AUTHOR("Mark Lord"); +MODULE_DESCRIPTION("PCI driver module for Tekram TRM290 IDE"); +MODULE_LICENSE("GPL"); |