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drivers/ide/trm290.c
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/* |
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* Copyright (c) 1997-1998 Mark Lord |
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* Copyright (c) 2007 MontaVista Software, Inc. <source@mvista.com> |
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* |
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* May be copied or modified under the terms of the GNU General Public License * * June 22, 2004 - get rid of check_region |
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* - Jesper Juhl |
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* */ /* * 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 * */ |
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#include <linux/types.h> #include <linux/module.h> #include <linux/kernel.h> |
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#include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/blkdev.h> #include <linux/init.h> |
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#include <linux/pci.h> |
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#include <linux/ide.h> #include <asm/io.h> |
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#define DRV_NAME "trm290" |
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static void trm290_prepare_drive (ide_drive_t *drive, unsigned int use_dma) { |
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ide_hwif_t *hwif = drive->hwif; |
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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 */ |
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outb(0x51 | (hwif->channel << 3), hwif->config_data + 1); outw(reg & 0xff, hwif->config_data); |
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} /* enable IRQ if not probing */ |
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if (drive->dev_flags & IDE_DFLAG_PRESENT) { |
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reg = inw(hwif->config_data + 3); |
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reg &= 0x13; reg &= ~(1 << hwif->channel); |
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outw(reg, hwif->config_data + 3); |
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} local_irq_restore(flags); } |
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static void trm290_dev_select(ide_drive_t *drive) |
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{ |
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trm290_prepare_drive(drive, !!(drive->dev_flags & IDE_DFLAG_USING_DMA)); |
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outb(drive->select | ATA_DEVICE_OBS, drive->hwif->io_ports.device_addr); |
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} |
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static int trm290_dma_check(ide_drive_t *drive, struct ide_cmd *cmd) |
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{ |
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if (cmd->tf_flags & IDE_TFLAG_WRITE) { |
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#ifdef TRM290_NO_DMA_WRITES /* always use PIO for writes */ |
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return 1; #endif |
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} return 0; } static int trm290_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd) { ide_hwif_t *hwif = drive->hwif; unsigned int count, rw = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 1 : 2; |
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|
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count = ide_build_dmatable(drive, cmd); |
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if (count == 0) |
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/* try PIO instead of DMA */ |
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return 1; |
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|
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outl(hwif->dmatable_dma | rw, hwif->dma_base); |
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/* start DMA */ |
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outw(count * 2 - 1, hwif->dma_base + 2); |
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|
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return 0; } |
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static void trm290_dma_start(ide_drive_t *drive) |
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{ |
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trm290_prepare_drive(drive, 1); |
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} |
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static int trm290_dma_end(ide_drive_t *drive) |
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{ |
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u16 status = inw(drive->hwif->dma_base + 2); |
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|
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trm290_prepare_drive(drive, 0); |
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return status != 0x00ff; |
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} |
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static int trm290_dma_test_irq(ide_drive_t *drive) |
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{ |
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u16 status = inw(drive->hwif->dma_base + 2); |
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|
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return status == 0x00ff; |
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} |
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|
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static void trm290_dma_host_set(ide_drive_t *drive, int on) |
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{ } |
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static void init_hwif_trm290(ide_hwif_t *hwif) |
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{ |
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struct pci_dev *dev = to_pci_dev(hwif->dev); |
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unsigned int cfg_base = pci_resource_start(dev, 4); |
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unsigned long flags; u8 reg = 0; |
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|
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if ((dev->class & 5) && cfg_base) |
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printk(KERN_INFO DRV_NAME " %s: chip", pci_name(dev)); |
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else { cfg_base = 0x3df0; |
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printk(KERN_INFO DRV_NAME " %s: using default", pci_name(dev)); |
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} printk(KERN_CONT " config base at 0x%04x ", cfg_base); hwif->config_data = cfg_base; hwif->dma_base = (cfg_base + 4) ^ (hwif->channel ? 0x80 : 0); |
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printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx ", |
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hwif->name, hwif->dma_base, hwif->dma_base + 3); |
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if (ide_allocate_dma_engine(hwif)) |
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return; |
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local_irq_save(flags); /* put config reg into first byte of hwif->select_data */ |
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outb(0x51 | (hwif->channel << 3), hwif->config_data + 1); |
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/* select PIO as default */ hwif->select_data = 0x21; |
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outb(hwif->select_data, hwif->config_data); |
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/* get IRQ info */ |
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reg = inb(hwif->config_data + 3); |
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/* mask IRQs for both ports */ reg = (reg & 0x10) | 0x03; |
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outb(reg, hwif->config_data + 3); |
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local_irq_restore(flags); |
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if (reg & 0x10) |
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/* legacy mode */ hwif->irq = hwif->channel ? 15 : 14; |
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|
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#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; |
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outb(0x54 | (hwif->channel << 3), hwif->config_data + 1); old = inw(hwif->config_data); |
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old &= ~1; |
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old_mask = inb(old + 2); |
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if (old != compat && old_mask == 0xff) { /* leave lower 10 bits untouched */ compat += (next_offset += 0x400); |
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hwif->io_ports.ctl_addr = compat + 2; |
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outw(compat | 1, hwif->config_data); new = inw(hwif->config_data); |
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printk(KERN_INFO "%s: control basereg workaround: " "old=0x%04x, new=0x%04x ", hwif->name, old, new & ~1); } } #endif } |
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static const struct ide_tp_ops trm290_tp_ops = { .exec_command = ide_exec_command, .read_status = ide_read_status, .read_altstatus = ide_read_altstatus, .write_devctl = ide_write_devctl, .dev_select = trm290_dev_select, .tf_load = ide_tf_load, .tf_read = ide_tf_read, .input_data = ide_input_data, .output_data = ide_output_data, |
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}; |
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static const struct ide_dma_ops trm290_dma_ops = { |
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.dma_host_set = trm290_dma_host_set, .dma_setup = trm290_dma_setup, |
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.dma_start = trm290_dma_start, .dma_end = trm290_dma_end, .dma_test_irq = trm290_dma_test_irq, |
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.dma_lost_irq = ide_dma_lost_irq, |
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.dma_check = trm290_dma_check, |
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}; |
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static const struct ide_port_info trm290_chipset = { |
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.name = DRV_NAME, |
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.init_hwif = init_hwif_trm290, |
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.tp_ops = &trm290_tp_ops, |
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.dma_ops = &trm290_dma_ops, |
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.host_flags = IDE_HFLAG_TRM290 | IDE_HFLAG_NO_ATAPI_DMA | |
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#if 0 /* play it safe for now */ |
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IDE_HFLAG_TRUST_BIOS_FOR_DMA | |
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#endif |
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IDE_HFLAG_NO_AUTODMA | |
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IDE_HFLAG_NO_LBA48, |
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}; |
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static int trm290_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
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{ |
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return ide_pci_init_one(dev, &trm290_chipset, NULL); |
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} |
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static const struct pci_device_id trm290_pci_tbl[] = { { PCI_VDEVICE(TEKRAM, PCI_DEVICE_ID_TEKRAM_DC290), 0 }, |
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{ 0, }, }; MODULE_DEVICE_TABLE(pci, trm290_pci_tbl); |
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static struct pci_driver trm290_pci_driver = { |
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.name = "TRM290_IDE", .id_table = trm290_pci_tbl, .probe = trm290_init_one, |
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.remove = ide_pci_remove, |
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}; |
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static int __init trm290_ide_init(void) |
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{ |
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return ide_pci_register_driver(&trm290_pci_driver); |
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} |
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static void __exit trm290_ide_exit(void) { |
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pci_unregister_driver(&trm290_pci_driver); |
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} |
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module_init(trm290_ide_init); |
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module_exit(trm290_ide_exit); |
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MODULE_AUTHOR("Mark Lord"); MODULE_DESCRIPTION("PCI driver module for Tekram TRM290 IDE"); MODULE_LICENSE("GPL"); |