| /* |
| * New ATA layer SC1200 driver Alan Cox <alan@redhat.com> |
| * |
| * TODO: Mode selection filtering |
| * TODO: Can't enable second channel until ATA core has serialize |
| * TODO: Needs custom DMA cleanup code |
| * |
| * Based very heavily on |
| * |
| * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003 |
| * |
| * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com> |
| * May be copied or modified under the terms of the GNU General Public License |
| * |
| * Development of this chipset driver was funded |
| * by the nice folks at National Semiconductor. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * 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; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <linux/delay.h> |
| #include <scsi/scsi_host.h> |
| #include <linux/libata.h> |
| |
| #define DRV_NAME "sc1200" |
| #define DRV_VERSION "0.2.3" |
| |
| #define SC1200_REV_A 0x00 |
| #define SC1200_REV_B1 0x01 |
| #define SC1200_REV_B3 0x02 |
| #define SC1200_REV_C1 0x03 |
| #define SC1200_REV_D1 0x04 |
| |
| /** |
| * sc1200_clock - PCI clock |
| * |
| * Return the PCI bus clocking for the SC1200 chipset configuration |
| * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz |
| */ |
| |
| static int sc1200_clock(void) |
| { |
| /* Magic registers that give us the chipset data */ |
| u8 chip_id = inb(0x903C); |
| u8 silicon_rev = inb(0x903D); |
| u16 pci_clock; |
| |
| if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1) |
| return 0; /* 33 MHz mode */ |
| |
| /* Clock generator configuration 0x901E its 8/9 are the PCI clocking |
| 0/3 is 33Mhz 1 is 48 2 is 66 */ |
| |
| pci_clock = inw(0x901E); |
| pci_clock >>= 8; |
| pci_clock &= 0x03; |
| if (pci_clock == 3) |
| pci_clock = 0; |
| return pci_clock; |
| } |
| |
| /** |
| * sc1200_set_piomode - PIO setup |
| * @ap: ATA interface |
| * @adev: device on the interface |
| * |
| * Set our PIO requirements. This is fairly simple on the SC1200 |
| */ |
| |
| static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev) |
| { |
| static const u32 pio_timings[4][5] = { |
| {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz |
| {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz |
| {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz |
| {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131} // format1, 66Mhz |
| }; |
| |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| u32 format; |
| unsigned int reg = 0x40 + 0x10 * ap->port_no; |
| int mode = adev->pio_mode - XFER_PIO_0; |
| |
| pci_read_config_dword(pdev, reg + 4, &format); |
| format >>= 31; |
| format += sc1200_clock(); |
| pci_write_config_dword(pdev, reg + 8 * adev->devno, |
| pio_timings[format][mode]); |
| } |
| |
| /** |
| * sc1200_set_dmamode - DMA timing setup |
| * @ap: ATA interface |
| * @adev: Device being configured |
| * |
| * We cannot mix MWDMA and UDMA without reloading timings each switch |
| * master to slave. |
| */ |
| |
| static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev) |
| { |
| static const u32 udma_timing[3][3] = { |
| { 0x00921250, 0x00911140, 0x00911030 }, |
| { 0x00932470, 0x00922260, 0x00922140 }, |
| { 0x009436A1, 0x00933481, 0x00923261 } |
| }; |
| |
| static const u32 mwdma_timing[3][3] = { |
| { 0x00077771, 0x00012121, 0x00002020 }, |
| { 0x000BBBB2, 0x00024241, 0x00013131 }, |
| { 0x000FFFF3, 0x00035352, 0x00015151 } |
| }; |
| |
| int clock = sc1200_clock(); |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| unsigned int reg = 0x40 + 0x10 * ap->port_no; |
| int mode = adev->dma_mode; |
| u32 format; |
| |
| if (mode >= XFER_UDMA_0) |
| format = udma_timing[clock][mode - XFER_UDMA_0]; |
| else |
| format = mwdma_timing[clock][mode - XFER_MW_DMA_0]; |
| |
| if (adev->devno == 0) { |
| u32 timings; |
| |
| pci_read_config_dword(pdev, reg + 4, &timings); |
| timings &= 0x80000000UL; |
| timings |= format; |
| pci_write_config_dword(pdev, reg + 4, timings); |
| } else |
| pci_write_config_dword(pdev, reg + 12, format); |
| } |
| |
| /** |
| * sc1200_qc_issue_prot - command issue |
| * @qc: command pending |
| * |
| * Called when the libata layer is about to issue a command. We wrap |
| * this interface so that we can load the correct ATA timings if |
| * neccessary. Specifically we have a problem that there is only |
| * one MWDMA/UDMA bit. |
| */ |
| |
| static unsigned int sc1200_qc_issue_prot(struct ata_queued_cmd *qc) |
| { |
| struct ata_port *ap = qc->ap; |
| struct ata_device *adev = qc->dev; |
| struct ata_device *prev = ap->private_data; |
| |
| /* See if the DMA settings could be wrong */ |
| if (adev->dma_mode != 0 && adev != prev && prev != NULL) { |
| /* Maybe, but do the channels match MWDMA/UDMA ? */ |
| if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) || |
| (adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0)) |
| /* Switch the mode bits */ |
| sc1200_set_dmamode(ap, adev); |
| } |
| |
| return ata_qc_issue_prot(qc); |
| } |
| |
| static struct scsi_host_template sc1200_sht = { |
| .module = THIS_MODULE, |
| .name = DRV_NAME, |
| .ioctl = ata_scsi_ioctl, |
| .queuecommand = ata_scsi_queuecmd, |
| .can_queue = ATA_DEF_QUEUE, |
| .this_id = ATA_SHT_THIS_ID, |
| .sg_tablesize = LIBATA_MAX_PRD, |
| .max_sectors = ATA_MAX_SECTORS, |
| .cmd_per_lun = ATA_SHT_CMD_PER_LUN, |
| .emulated = ATA_SHT_EMULATED, |
| .use_clustering = ATA_SHT_USE_CLUSTERING, |
| .proc_name = DRV_NAME, |
| .dma_boundary = ATA_DMA_BOUNDARY, |
| .slave_configure = ata_scsi_slave_config, |
| .bios_param = ata_std_bios_param, |
| }; |
| |
| static struct ata_port_operations sc1200_port_ops = { |
| .port_disable = ata_port_disable, |
| .set_piomode = sc1200_set_piomode, |
| .set_dmamode = sc1200_set_dmamode, |
| .mode_filter = ata_pci_default_filter, |
| |
| .tf_load = ata_tf_load, |
| .tf_read = ata_tf_read, |
| .check_status = ata_check_status, |
| .exec_command = ata_exec_command, |
| .dev_select = ata_std_dev_select, |
| |
| .error_handler = ata_bmdma_error_handler, |
| |
| .bmdma_setup = ata_bmdma_setup, |
| .bmdma_start = ata_bmdma_start, |
| .bmdma_stop = ata_bmdma_stop, |
| .bmdma_status = ata_bmdma_status, |
| |
| .qc_prep = ata_qc_prep, |
| .qc_issue = sc1200_qc_issue_prot, |
| .eng_timeout = ata_eng_timeout, |
| .data_xfer = ata_pio_data_xfer, |
| |
| .irq_handler = ata_interrupt, |
| .irq_clear = ata_bmdma_irq_clear, |
| |
| .port_start = ata_port_start, |
| .port_stop = ata_port_stop, |
| .host_stop = ata_host_stop |
| }; |
| |
| /** |
| * sc1200_init_one - Initialise an SC1200 |
| * @dev: PCI device |
| * @id: Entry in match table |
| * |
| * Just throw the needed data at the libata helper and it does all |
| * our work. |
| */ |
| |
| static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
| { |
| static struct ata_port_info info = { |
| .sht = &sc1200_sht, |
| .flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST, |
| .pio_mask = 0x1f, |
| .mwdma_mask = 0x07, |
| .udma_mask = 0x07, |
| .port_ops = &sc1200_port_ops |
| }; |
| static struct ata_port_info *port_info[2] = { &info, &info }; |
| |
| /* Can't enable port 2 yet, see top comments */ |
| return ata_pci_init_one(dev, port_info, 1); |
| } |
| |
| static struct pci_device_id sc1200[] = { |
| { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_IDE), }, |
| { 0, }, |
| }; |
| |
| static struct pci_driver sc1200_pci_driver = { |
| .name = DRV_NAME, |
| .id_table = sc1200, |
| .probe = sc1200_init_one, |
| .remove = ata_pci_remove_one |
| }; |
| |
| static int __init sc1200_init(void) |
| { |
| return pci_register_driver(&sc1200_pci_driver); |
| } |
| |
| |
| static void __exit sc1200_exit(void) |
| { |
| pci_unregister_driver(&sc1200_pci_driver); |
| } |
| |
| |
| MODULE_AUTHOR("Alan Cox, Mark Lord"); |
| MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DEVICE_TABLE(pci, sc1200); |
| MODULE_VERSION(DRV_VERSION); |
| |
| module_init(sc1200_init); |
| module_exit(sc1200_exit); |