/* * pata_rdc - Driver for later RDC PATA controllers * * This is actually a driver for hardware meeting * INCITS 370-2004 (1510D): ATA Host Adapter Standards * * Based on ata_piix. * * 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. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/blkdev.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/gfp.h> #include <scsi/scsi_host.h> #include <linux/libata.h> #include <linux/dmi.h> #define DRV_NAME "pata_rdc" #define DRV_VERSION "0.01" struct rdc_host_priv { u32 saved_iocfg; }; /** * rdc_pata_cable_detect - Probe host controller cable detect info * @ap: Port for which cable detect info is desired * * Read 80c cable indicator from ATA PCI device's PCI config * register. This register is normally set by firmware (BIOS). * * LOCKING: * None (inherited from caller). */ static int rdc_pata_cable_detect(struct ata_port *ap) { struct rdc_host_priv *hpriv = ap->host->private_data; u8 mask; /* check BIOS cable detect results */ mask = 0x30 << (2 * ap->port_no); if ((hpriv->saved_iocfg & mask) == 0) return ATA_CBL_PATA40; return ATA_CBL_PATA80; } /** * rdc_pata_prereset - prereset for PATA host controller * @link: Target link * @deadline: deadline jiffies for the operation * * LOCKING: * None (inherited from caller). */ static int rdc_pata_prereset(struct ata_link *link, unsigned long deadline) { struct ata_port *ap = link->ap; struct pci_dev *pdev = to_pci_dev(ap->host->dev); static const struct pci_bits rdc_enable_bits[] = { { 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */ { 0x43U, 1U, 0x80UL, 0x80UL }, /* port 1 */ }; if (!pci_test_config_bits(pdev, &rdc_enable_bits[ap->port_no])) return -ENOENT; return ata_sff_prereset(link, deadline); } static DEFINE_SPINLOCK(rdc_lock); /** * rdc_set_piomode - Initialize host controller PATA PIO timings * @ap: Port whose timings we are configuring * @adev: um * * Set PIO mode for device, in host controller PCI config space. * * LOCKING: * None (inherited from caller). */ static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev) { unsigned int pio = adev->pio_mode - XFER_PIO_0; struct pci_dev *dev = to_pci_dev(ap->host->dev); unsigned long flags; unsigned int is_slave = (adev->devno != 0); unsigned int master_port= ap->port_no ? 0x42 : 0x40; unsigned int slave_port = 0x44; u16 master_data; u8 slave_data; u8 udma_enable; int control = 0; static const /* ISP RTC */ u8 timings[][2] = { { 0, 0 }, { 0, 0 }, { 1, 0 }, { 2, 1 }, { 2, 3 }, }; if (pio >= 2) control |= 1; /* TIME1 enable */ if (ata_pio_need_iordy(adev)) control |= 2; /* IE enable */ if (adev->class == ATA_DEV_ATA) control |= 4; /* PPE enable */ spin_lock_irqsave(&rdc_lock, flags); /* PIO configuration clears DTE unconditionally. It will be * programmed in set_dmamode which is guaranteed to be called * after set_piomode if any DMA mode is available. */ pci_read_config_word(dev, master_port, &master_data); if (is_slave) { /* clear TIME1|IE1|PPE1|DTE1 */ master_data &= 0xff0f; /* Enable SITRE (separate slave timing register) */ master_data |= 0x4000; /* enable PPE1, IE1 and TIME1 as needed */ master_data |= (control << 4); pci_read_config_byte(dev, slave_port, &slave_data); slave_data &= (ap->port_no ? 0x0f : 0xf0); /* Load the timing nibble for this slave */ slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0); } else { /* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */ master_data &= 0xccf0; /* Enable PPE, IE and TIME as appropriate */ master_data |= control; /* load ISP and RCT */ master_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8); } pci_write_config_word(dev, master_port, master_data); if (is_slave) pci_write_config_byte(dev, slave_port, slave_data); /* Ensure the UDMA bit is off - it will be turned back on if UDMA is selected */ pci_read_config_byte(dev, 0x48, &udma_enable); udma_enable &= ~(1 << (2 * ap->port_no + adev->devno)); pci_write_config_byte(dev, 0x48, udma_enable); spin_unlock_irqrestore(&rdc_lock, flags); } /** * rdc_set_dmamode - Initialize host controller PATA PIO timings * @ap: Port whose timings we are configuring * @adev: Drive in question * * Set UDMA mode for device, in host controller PCI config space. * * LOCKING: * None (inherited from caller). */ static void rdc_set_dmamode(struct ata_port *ap, struct ata_device *adev) { struct pci_dev *dev = to_pci_dev(ap->host->dev); unsigned long flags; u8 master_port = ap->port_no ? 0x42 : 0x40; u16 master_data; u8 speed = adev->dma_mode; int devid = adev->devno + 2 * ap->port_no; u8 udma_enable = 0; static const /* ISP RTC */ u8 timings[][2] = { { 0, 0 }, { 0, 0 }, { 1, 0 }, { 2, 1 }, { 2, 3 }, }; spin_lock_irqsave(&rdc_lock, flags); pci_read_config_word(dev, master_port, &master_data); pci_read_config_byte(dev, 0x48, &udma_enable); if (speed >= XFER_UDMA_0) { unsigned int udma = adev->dma_mode - XFER_UDMA_0; u16 udma_timing; u16 ideconf; int u_clock, u_speed; /* * UDMA is handled by a combination of clock switching and * selection of dividers * * Handy rule: Odd modes are UDMATIMx 01, even are 02 * except UDMA0 which is 00 */ u_speed = min(2 - (udma & 1), udma); if (udma == 5) u_clock = 0x1000; /* 100Mhz */ else if (udma > 2) u_clock = 1; /* 66Mhz */ else u_clock = 0; /* 33Mhz */ udma_enable |= (1 << devid); /* Load the CT/RP selection */ pci_read_config_word(dev, 0x4A, &udma_timing); udma_timing &= ~(3 << (4 * devid)); udma_timing |= u_speed << (4 * devid); pci_write_config_word(dev, 0x4A, udma_timing); /* Select a 33/66/100Mhz clock */ pci_read_config_word(dev, 0x54, &ideconf); ideconf &= ~(0x1001 << devid); ideconf |= u_clock << devid; pci_write_config_word(dev, 0x54, ideconf); } else { /* * MWDMA is driven by the PIO timings. We must also enable * IORDY unconditionally along with TIME1. PPE has already * been set when the PIO timing was set. */ unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0; unsigned int control; u8 slave_data; const unsigned int needed_pio[3] = { XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 }; int pio = needed_pio[mwdma] - XFER_PIO_0; control = 3; /* IORDY|TIME1 */ /* If the drive MWDMA is faster than it can do PIO then we must force PIO into PIO0 */ if (adev->pio_mode < needed_pio[mwdma]) /* Enable DMA timing only */ control |= 8; /* PIO cycles in PIO0 */ if (adev->devno) { /* Slave */ master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */ master_data |= control << 4; pci_read_config_byte(dev, 0x44, &slave_data); slave_data &= (ap->port_no ? 0x0f : 0xf0); /* Load the matching timing */ slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0); pci_write_config_byte(dev, 0x44, slave_data); } else { /* Master */ master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY and master timing bits */ master_data |= control; master_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8); } udma_enable &= ~(1 << devid); pci_write_config_word(dev, master_port, master_data); } pci_write_config_byte(dev, 0x48, udma_enable); spin_unlock_irqrestore(&rdc_lock, flags); } static struct ata_port_operations rdc_pata_ops = { .inherits = &ata_bmdma32_port_ops, .cable_detect = rdc_pata_cable_detect, .set_piomode = rdc_set_piomode, .set_dmamode = rdc_set_dmamode, .prereset = rdc_pata_prereset, }; static const struct ata_port_info rdc_port_info = { .flags = ATA_FLAG_SLAVE_POSS, .pio_mask = ATA_PIO4, .mwdma_mask = ATA_MWDMA12_ONLY, .udma_mask = ATA_UDMA5, .port_ops = &rdc_pata_ops, }; static struct scsi_host_template rdc_sht = { ATA_BMDMA_SHT(DRV_NAME), }; /** * rdc_init_one - Register PIIX ATA PCI device with kernel services * @pdev: PCI device to register * @ent: Entry in rdc_pci_tbl matching with @pdev * * Called from kernel PCI layer. We probe for combined mode (sigh), * and then hand over control to libata, for it to do the rest. * * LOCKING: * Inherited from PCI layer (may sleep). * * RETURNS: * Zero on success, or -ERRNO value. */ static int rdc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) { struct device *dev = &pdev->dev; struct ata_port_info port_info[2]; const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] }; struct ata_host *host; struct rdc_host_priv *hpriv; int rc; ata_print_version_once(&pdev->dev, DRV_VERSION); port_info[0] = rdc_port_info; port_info[1] = rdc_port_info; /* enable device and prepare host */ rc = pcim_enable_device(pdev); if (rc) return rc; hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL); if (!hpriv) return -ENOMEM; /* Save IOCFG, this will be used for cable detection, quirk * detection and restoration on detach. */ pci_read_config_dword(pdev, 0x54, &hpriv->saved_iocfg); rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host); if (rc) return rc; host->private_data = hpriv; pci_intx(pdev, 1); host->flags |= ATA_HOST_PARALLEL_SCAN; pci_set_master(pdev); return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &rdc_sht); } static void rdc_remove_one(struct pci_dev *pdev) { struct ata_host *host = pci_get_drvdata(pdev); struct rdc_host_priv *hpriv = host->private_data; pci_write_config_dword(pdev, 0x54, hpriv->saved_iocfg); ata_pci_remove_one(pdev); } static const struct pci_device_id rdc_pci_tbl[] = { { PCI_DEVICE(0x17F3, 0x1011), }, { PCI_DEVICE(0x17F3, 0x1012), }, { } /* terminate list */ }; static struct pci_driver rdc_pci_driver = { .name = DRV_NAME, .id_table = rdc_pci_tbl, .probe = rdc_init_one, .remove = rdc_remove_one, #ifdef CONFIG_PM_SLEEP .suspend = ata_pci_device_suspend, .resume = ata_pci_device_resume, #endif }; module_pci_driver(rdc_pci_driver); MODULE_AUTHOR("Alan Cox (based on ata_piix)"); MODULE_DESCRIPTION("SCSI low-level driver for RDC PATA controllers"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, rdc_pci_tbl); MODULE_VERSION(DRV_VERSION);