From: Kamlakant Patel <kamlakant.patel@xxxxxxxxxxxx>
Add a platform ATA driver for the CF interface on Netlogic XLR/XLS
MIPS SoCs. Chipselect 6 on the peripheral IO bus on these SoCs can
be configured to act as a Compact Flash interface.
The driver expects three resources to be passed to it:
0 - memory region corresponding to the CF chipselect
1 - memory region of the flash interrupt ack register in the
flash configuration region
2 - and the IRQ resource for the Compact Flash.
Signed-off-by: Kamlakant Patel <kamlakant.patel@xxxxxxxxxxxx>
Signed-off-by: Jayachandran C <jayachandranc@xxxxxxxxxxxxxxxxx>
---
[Changes in V2 :
- fixes for comments by sshtylyov@xxxxxxxxxx
- use static functions
- use devm_request_and_ioremap for register area, and devm_ioremap
for ack register area.
- ap->private_data usage - use a structure pata_xlr_priv instead of
overloading the pointer.
]
drivers/ata/Kconfig | 9 +++
drivers/ata/Makefile | 1 +
drivers/ata/pata_xlr_cf.c | 170 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 180 insertions(+)
create mode 100644 drivers/ata/pata_xlr_cf.c
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 2be8ef1..a086a65 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -871,6 +871,15 @@ config PATA_SAMSUNG_CF
If unsure, say N.
+config PATA_XLR_CF
+ tristate "Netlogic XLR/XLS CompactFlash support"
+ depends on CPU_XLR
+ help
+ Support for the CompactFlash interface on Netlogic XLR/XLS
+ SoCs. Say Y if your Netlogic XLR/XLS board has a CF Slot.
+
+ If unsure, say N.
+
config PATA_WINBOND_VLB
tristate "Winbond W83759A VLB PATA support (Experimental)"
depends on ISA && EXPERIMENTAL
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index a454a13..927f131 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_PATA_OF_PLATFORM) += pata_of_platform.o
obj-$(CONFIG_PATA_RB532) += pata_rb532_cf.o
obj-$(CONFIG_PATA_RZ1000) += pata_rz1000.o
obj-$(CONFIG_PATA_SAMSUNG_CF) += pata_samsung_cf.o
+obj-$(CONFIG_PATA_XLR_CF) += pata_xlr_cf.o
obj-$(CONFIG_PATA_PXA) += pata_pxa.o
diff --git a/drivers/ata/pata_xlr_cf.c b/drivers/ata/pata_xlr_cf.c
new file mode 100644
index 0000000..7d699c4
--- /dev/null
+++ b/drivers/ata/pata_xlr_cf.c
@@ -0,0 +1,170 @@
+/*
+ * Copyright (c) 2012 Broadcom Corporation
+ *
+ * Based on Generic platform device PATA driver
+ * Copyright (C) 2006 - 2007 Paul Mundt
+ *
+ * Based on pata_pcmcia:
+ *
+ * Copyright 2005-2006 Red Hat Inc, all rights reserved.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/libata.h>
+#include <linux/platform_device.h>
+
+#define DRV_NAME "pata_xlr_cf"
+#define DRV_VERSION "1.0"
+
+#define XLR_CF_REG_BASE 0x1f0
+#define XLR_CF_REG_CTRL 0x3f6
+
+struct pata_xlr_priv {
+ void __iomem *xlr_cf_ackreg;
+};
+
+static int pata_xlr_set_mode(struct ata_link *link, struct ata_device **unused)
+{
+ struct ata_device *dev;
+
+ ata_for_each_dev(dev, link, ENABLED) {
+ dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
+ dev->xfer_shift = ATA_SHIFT_PIO;
+ dev->flags |= ATA_DFLAG_PIO;
+ ata_dev_info(dev, "configured for PIO\n");
+ }
+ return 0;
+}
+
+static struct scsi_host_template pata_xlr_sht = {
+ ATA_PIO_SHT(DRV_NAME),
+};
+
+static void pata_xlr_irq_clear(struct ata_port *port)
+{
+ struct pata_xlr_priv *priv = port->private_data;
+ unsigned int reg;
+
+ reg = readl(priv->xlr_cf_ackreg);
+ writel(reg, priv->xlr_cf_ackreg);
+}
+
+static bool pata_xlr_irq_check(struct ata_port *port)
+{
+ struct pata_xlr_priv *priv = port->private_data;
+ unsigned int reg;
+
+ reg = readl(priv->xlr_cf_ackreg);
+ return (reg != 0);
+}
+
+static struct ata_port_operations pata_xlr_port_ops = {
+ .inherits = &ata_sff_port_ops,
+ .set_mode = pata_xlr_set_mode,
+ .sff_irq_check = pata_xlr_irq_check,
+ .sff_irq_clear = pata_xlr_irq_clear,
+};
+
+static int pata_xlr_cf_remove(struct platform_device *pdev)
+{
+ struct ata_host *host = dev_get_drvdata(&pdev->dev);
+
+ ata_host_detach(host);
+ return 0;
+}
+
+static int __devinit pata_xlr_cf_probe(struct platform_device *pdev)
+{
+ struct ata_host *host;
+ struct ata_port *ap;
+ struct ata_ioports *ioaddr;
+ struct resource *io_res, *irq_res, *ack_res;
+ struct pata_xlr_priv *priv;
+ struct device *dev = &pdev->dev;
+ void __iomem *iodata_addr;
+ int irq = 0;
+
+ /* Simple resource validation */
+ if (pdev->num_resources != 3) {
+ dev_err(&pdev->dev, "invalid number of resources\n");
+ return -EINVAL;
+ }
+
+ /* Get the I/O base */
+ io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (io_res == NULL)
+ return -EINVAL;
+
+ ack_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (ack_res == NULL)
+ return -EINVAL;
+
+ /* And the IRQ */
+ irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (irq_res && irq_res->start > 0)
+ irq = irq_res->start;
+
+ iodata_addr = devm_request_and_ioremap(&pdev->dev, io_res);
+ if (!iodata_addr)
+ return -EBUSY;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->xlr_cf_ackreg = devm_ioremap(&pdev->dev, ack_res->start,
+ resource_size(ack_res));
+ if (!priv->xlr_cf_ackreg)
+ return -ENOMEM;
+
+ host = ata_host_alloc(dev, 1);
+ if (!host)
+ return -ENOMEM;
+
+ ap = host->ports[0];
+ ap->ops = &pata_xlr_port_ops;
+ ap->flags |= ATA_FLAG_SLAVE_POSS;
+ ap->private_data = priv;
+
+ /* Use polling mode if there's no IRQ */
+ if (!irq) {
+ ap->flags |= ATA_FLAG_PIO_POLLING;
+ ata_port_desc(ap, "no IRQ, using PIO polling");
+ }
+
+ ioaddr = &ap->ioaddr;
+ ioaddr->data_addr = iodata_addr;
+ ioaddr->cmd_addr = ioaddr->data_addr + XLR_CF_REG_BASE;
+ ioaddr->altstatus_addr = ioaddr->data_addr + XLR_CF_REG_CTRL;
+ ioaddr->ctl_addr = ioaddr->data_addr + XLR_CF_REG_CTRL;
+
+ ata_sff_std_ports(ioaddr);
+
+ ata_port_desc(ap, "mmio cmd 0x%x ctl 0x%x",
+ (unsigned int)ap->ioaddr.cmd_addr,
+ (unsigned int)ap->ioaddr.ctl_addr);
+
+ /* activate */
+ return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
+ IRQF_DISABLED, &pata_xlr_sht);
+}
+
+static struct platform_driver pata_xlr_driver = {
+ .probe = pata_xlr_cf_probe,
+ .remove = __devexit_p(pata_xlr_cf_remove),
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+module_platform_driver(pata_xlr_driver);
+
+MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("XLR/XLS Compact Flash driver");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(DRV_VERSION);
+MODULE_ALIAS("platform:" DRV_NAME);
--
1.7.9.5
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