This is a driver specifically for the ATA controller on the Geode
CS5536 companion chip. The PCI device ID for this device was
previously claimed by pata_amd.c but there were two problems with
that:
- Not all Geode platforms emulate the ATA registers in PCI config
space
- CS5536 PIO timings are not identical to AMD74XX/8111
pata_cs5536.c relies on Geode Machine Specific Registers to configure
the ATA function and uses the correct PIO timings for the chip.
Signed-off-by: Martin K. Petersen <mkp@xxxxxxx>
---
diff -r de183081194a drivers/ata/Kconfig
--- a/drivers/ata/Kconfig Tue Oct 02 18:00:56 2007 +0000
+++ b/drivers/ata/Kconfig Fri Oct 05 01:20:22 2007 -0400
@@ -254,6 +254,15 @@ config PATA_CS5535
If unsure, say N.
+config PATA_CS5536
+ tristate "CS5536 PATA support (Experimental)"
+ depends on PCI && X86 && !X86_64 && EXPERIMENTAL
+ help
+ This option enables support for the AMD CS5536
+ companion chip used with the Geode LX processor family.
+
+ If unsure, say N.
+
config PATA_CYPRESS
tristate "Cypress CY82C693 PATA support (Very Experimental)"
depends on PCI && EXPERIMENTAL
diff -r de183081194a drivers/ata/Makefile
--- a/drivers/ata/Makefile Tue Oct 02 18:00:56 2007 +0000
+++ b/drivers/ata/Makefile Fri Oct 05 01:20:22 2007 -0400
@@ -27,6 +27,7 @@ obj-$(CONFIG_PATA_CS5520) += pata_cs5520
obj-$(CONFIG_PATA_CS5520) += pata_cs5520.o
obj-$(CONFIG_PATA_CS5530) += pata_cs5530.o
obj-$(CONFIG_PATA_CS5535) += pata_cs5535.o
+obj-$(CONFIG_PATA_CS5536) += pata_cs5536.o
obj-$(CONFIG_PATA_CYPRESS) += pata_cypress.o
obj-$(CONFIG_PATA_EFAR) += pata_efar.o
obj-$(CONFIG_PATA_HPT366) += pata_hpt366.o
diff -r de183081194a drivers/ata/pata_amd.c
--- a/drivers/ata/pata_amd.c Tue Oct 02 18:00:56 2007 +0000
+++ b/drivers/ata/pata_amd.c Fri Oct 05 01:20:22 2007 -0400
@@ -693,7 +693,9 @@ static const struct pci_device_id amd[]
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP67_IDE), 8 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP73_IDE), 8 },
{ PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP77_IDE), 8 },
+#ifndef CONFIG_PATA_CS5536 /* Temporary */
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), 9 },
+#endif
{ },
};
diff -r de183081194a drivers/ata/pata_cs5536.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/ata/pata_cs5536.c Fri Oct 05 01:20:22 2007 -0400
@@ -0,0 +1,298 @@
+/*
+ * pata_cs5536.c - CS5536 PATA for new ATA layer
+ * (C) 2007 Martin K. Petersen <mkp@xxxxxxx>
+ *
+ * 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
+ *
+ * Documentation:
+ * Available from AMD web site.
+ *
+ * Like its predecessor (CS5535), CS5536 exposes its IDE configuration
+ * registers to the Geode Machine Specific Register file instead of
+ * PCI config space. The 5536 IDE registers are modeled after the AMD
+ * 74xx PCI IDE controller although some of the timing knobs are
+ * subtly different. Initially the CS5536 was supported by the
+ * pata_amd.c driver as some Geode platforms emulate the PCI config
+ * register support in firmware. This driver, however, does not
+ * depend on PCI config emulation and accesses the MSR registers
+ * directly.
+ */
+
+#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/libata.h>
+#include <scsi/scsi_host.h>
+#include <asm/msr.h>
+
+#define DRV_NAME "pata_cs5536"
+#define DRV_VERSION "0.0.3"
+
+enum {
+ MSR_IDE_BASE = 0x51300000,
+
+ MSR_IDE_CFG = (MSR_IDE_BASE + 0x10),
+ MSR_IDE_DTC = (MSR_IDE_BASE + 0x12),
+ MSR_IDE_CAST = (MSR_IDE_BASE + 0x13),
+ MSR_IDE_ETC = (MSR_IDE_BASE + 0x14),
+
+ IDE_CFG_CHANEN = 0x2,
+ IDE_CFG_CABLE = 0x10000,
+ IDE_CFG_CABLE_MASK = 0x30000,
+
+ IDE_D0_SHIFT = 24,
+ IDE_D1_SHIFT = 16,
+ IDE_DRV_MASK = 0xff,
+
+ IDE_CAST_D0_SHIFT = 6,
+ IDE_CAST_D1_SHIFT = 4,
+ IDE_CAST_DRV_MASK = 0x3,
+ IDE_CAST_CMD_MASK = 0xff,
+ IDE_CAST_CMD_SHIFT = 24,
+
+ IDE_ETC_NODMA = 0x03,
+};
+
+/**
+ * cs5536_cable_detect - detect cable type
+ * @ap: Port to detect on
+ * @deadline: deadline jiffies for the operation
+ *
+ * Perform cable detection for ATA66 capable cable. Return a libata
+ * cable type.
+ */
+
+static int cs5536_cable_detect(struct ata_port *ap)
+{
+ u32 reg, dummy;
+
+ rdmsr(MSR_IDE_CFG, reg, dummy);
+
+ if (reg & (IDE_CFG_CABLE << ap->port_no))
+ return ATA_CBL_PATA80;
+ else
+ return ATA_CBL_PATA40;
+}
+
+/**
+ * cs5536_set_piomode - PIO setup
+ * @ap: ATA interface
+ * @adev: device on the interface
+ */
+
+static void cs5536_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+ static const u8 drv_timings[5] = {
+ 0x98, 0x55, 0x32, 0x21, 0x20
+ };
+
+ static const u8 addr_timings[5] = {
+ 0x2, 0x1, 0x0, 0x0, 0x0
+ };
+
+ static const u8 cmd_timings[5] = {
+ 0x99, 0x92, 0x90, 0x22, 0x20
+ };
+
+ struct ata_device *pair = ata_dev_pair(adev);
+ int mode = adev->pio_mode - XFER_PIO_0;
+ int cmdmode = mode;
+ int dshift = ap->port_no ? IDE_D1_SHIFT : IDE_D0_SHIFT;
+ int cshift = ap->port_no ? IDE_CAST_D1_SHIFT : IDE_CAST_D0_SHIFT;
+ u32 dtc, cast, etc, dummy;
+
+ if (pair)
+ cmdmode = min(mode, pair->pio_mode - XFER_PIO_0);
+
+ rdmsr(MSR_IDE_DTC, dtc, dummy);
+ rdmsr(MSR_IDE_CAST, cast, dummy);
+ rdmsr(MSR_IDE_ETC, etc, dummy);
+
+ dtc &= ~(IDE_DRV_MASK << dshift);
+ dtc |= drv_timings[mode] << dshift;
+
+ cast &= ~(IDE_CAST_DRV_MASK << cshift);
+ cast |= addr_timings[mode] << cshift;
+
+ cast &= ~(IDE_CAST_CMD_MASK << IDE_CAST_CMD_SHIFT);
+ cast |= cmd_timings[cmdmode] << IDE_CAST_CMD_SHIFT;
+
+ etc &= ~(IDE_DRV_MASK << dshift);
+ etc |= IDE_ETC_NODMA << dshift;
+
+ wrmsr(MSR_IDE_DTC, dtc, dummy);
+ wrmsr(MSR_IDE_CAST, cast, dummy);
+ wrmsr(MSR_IDE_ETC, etc, dummy);
+}
+
+/**
+ * cs5536_set_dmamode - DMA timing setup
+ * @ap: ATA interface
+ * @adev: Device being configured
+ *
+ */
+
+static void cs5536_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+ static const u8 udma_timings[6] = {
+ 0xc2, 0xc1, 0xc0, 0xc4, 0xc5, 0xc6
+ };
+
+ static const u8 mwdma_timings[3] = {
+ 0x67, 0x21, 0x20
+ };
+
+ u32 dtc, etc, dummy;
+ int mode = adev->dma_mode;
+ int dshift = ap->port_no ? IDE_D1_SHIFT : IDE_D0_SHIFT;
+
+ if (mode >= XFER_UDMA_0) {
+ rdmsr(MSR_IDE_ETC, etc, dummy);
+
+ etc &= ~(IDE_DRV_MASK << dshift);
+ etc |= udma_timings[mode - XFER_UDMA_0] << dshift;
+
+ wrmsr(MSR_IDE_ETC, etc, dummy);
+ } else { /* MWDMA */
+ rdmsr(MSR_IDE_DTC, dtc, dummy);
+
+ dtc &= ~(IDE_DRV_MASK << dshift);
+ dtc |= mwdma_timings[mode] << dshift;
+
+ wrmsr(MSR_IDE_DTC, dtc, dummy);
+ }
+}
+
+static struct scsi_host_template cs5536_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,
+ .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,
+ .slave_destroy = ata_scsi_slave_destroy,
+ .bios_param = ata_std_bios_param,
+};
+
+static struct ata_port_operations cs5536_port_ops = {
+ .port_disable = ata_port_disable,
+ .set_piomode = cs5536_set_piomode,
+ .set_dmamode = cs5536_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,
+
+ .freeze = ata_bmdma_freeze,
+ .thaw = ata_bmdma_thaw,
+ .error_handler = ata_bmdma_error_handler,
+ .post_internal_cmd = ata_bmdma_post_internal_cmd,
+ .cable_detect = cs5536_cable_detect,
+
+ .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 = ata_qc_issue_prot,
+
+ .data_xfer = ata_data_xfer,
+
+ .irq_handler = ata_interrupt,
+ .irq_clear = ata_bmdma_irq_clear,
+ .irq_on = ata_irq_on,
+ .irq_ack = ata_irq_ack,
+
+ .port_start = ata_port_start,
+};
+
+/**
+ * cs5536_init_one
+ * @dev: PCI device
+ * @id: Entry in match table
+ *
+ */
+
+static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ static const struct ata_port_info info = {
+ .sht = &cs5536_sht,
+ .flags = ATA_FLAG_SLAVE_POSS,
+ .pio_mask = 0x1f,
+ .mwdma_mask = 0x07,
+ .udma_mask = ATA_UDMA5,
+ .port_ops = &cs5536_port_ops
+ };
+
+ const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
+ u32 cfg, dummy;
+
+ rdmsr(MSR_IDE_CFG, cfg, dummy);
+
+ if ((cfg & IDE_CFG_CHANEN) == 0) {
+ printk(KERN_ERR DRV_NAME ": disabled by BIOS\n");
+ return -ENODEV;
+ }
+
+ return ata_pci_init_one(dev, ppi);
+}
+
+static const struct pci_device_id cs5536[] = {
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5536_IDE), },
+ { },
+};
+
+static struct pci_driver cs5536_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = cs5536,
+ .probe = cs5536_init_one,
+ .remove = ata_pci_remove_one,
+#ifdef CONFIG_PM
+ .suspend = ata_pci_device_suspend,
+ .resume = ata_pci_device_resume,
+#endif
+};
+
+static int __init cs5536_init(void)
+{
+ return pci_register_driver(&cs5536_pci_driver);
+}
+
+static void __exit cs5536_exit(void)
+{
+ pci_unregister_driver(&cs5536_pci_driver);
+}
+
+MODULE_AUTHOR("Martin K. Petersen");
+MODULE_DESCRIPTION("low-level driver for the CS5536 IDE controller");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, cs5536);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(cs5536_init);
+module_exit(cs5536_exit);
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