[libata] Add pata_rdc driver for RDC ATA devices

From: Alan Cox <alan@linux.intel.com>

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

3 files changed, 411 insertions, 0 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 8e64d3c81d5..ab2fa4eeb36 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -597,6 +597,16 @@ config PATA_RB532
 
           If unsure, say N.
 
+config PATA_RDC
+        tristate "RDC PATA support"
+        depends on PCI
+        help
+          This option enables basic support for the later RDC PATA controllers
+          controllers via the new ATA layer. For the RDC 1010, you need to
+          enable the IT821X driver instead.
+
+          If unsure, say N.
+
 config PATA_RZ1000
         tristate "PC Tech RZ1000 PATA support"
         depends on PCI
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 38906f9bbb4..463eb52236a 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_PATA_PDC_OLD)	+= pata_pdc202xx_old.o
 obj-$(CONFIG_PATA_QDI)          += pata_qdi.o
 obj-$(CONFIG_PATA_RADISYS)      += pata_radisys.o
 obj-$(CONFIG_PATA_RB532)        += pata_rb532_cf.o
+obj-$(CONFIG_PATA_RDC)          += pata_rdc.o
 obj-$(CONFIG_PATA_RZ1000)       += pata_rz1000.o
 obj-$(CONFIG_PATA_SC1200)       += pata_sc1200.o
 obj-$(CONFIG_PATA_SERVERWORKS)  += pata_serverworks.o
diff --git a/drivers/ata/pata_rdc.c b/drivers/ata/pata_rdc.c
new file mode 100644
index 00000000000..c843a1e07c4
--- /dev/null
+++ b/drivers/ata/pata_rdc.c
@@ -0,0 +1,400 @@
+/*
+ *  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/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/device.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);
+}
+
+/**
+ *      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 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 */
+
+        /* 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);
+}
+
+/**
+ *      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);
+        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 }, };
+
+        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);
+}
+
+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 struct ata_port_info rdc_port_info = {
+
+        .flags          = ATA_FLAG_SLAVE_POSS,
+        .pio_mask       = ATA_PIO4,
+        .mwdma_mask     = ATA_MWDMA2,
+        .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 __devinit rdc_init_one(struct pci_dev *pdev,
+                                   const struct pci_device_id *ent)
+{
+        static int printed_version;
+        struct device *dev = &pdev->dev;
+        struct ata_port_info port_info[2];
+        const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };
+        unsigned long port_flags;
+        struct ata_host *host;
+        struct rdc_host_priv *hpriv;
+        int rc;
+
+        if (!printed_version++)
+                dev_printk(KERN_DEBUG, &pdev->dev,
+                           "version " DRV_VERSION "\n");
+
+        port_info[0] = rdc_port_info;
+        port_info[1] = rdc_port_info;
+
+        port_flags = port_info[0].flags;
+
+        /* 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_sff_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_sff_interrupt, &rdc_sht);
+}
+
+static void rdc_remove_one(struct pci_dev *pdev)
+{
+        struct ata_host *host = dev_get_drvdata(&pdev->dev);
+        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,
+};
+
+
+static int __init rdc_init(void)
+{
+        return pci_register_driver(&rdc_pci_driver);
+}
+
+static void __exit rdc_exit(void)
+{
+        pci_unregister_driver(&rdc_pci_driver);
+}
+
+module_init(rdc_init);
+module_exit(rdc_exit);
+
+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);