spi: controller driver for Designware SPI core
Driver for the Designware SPI core, it supports multipul interfaces like
PCI/APB etc. User can use "dw_apb_ssi_db.pdf" from Synopsys as HW
datasheet.
[randy.dunlap@oracle.com: fix build]
[akpm@linux-foundation.org: build fix]
Signed-off-by: Feng Tang <feng.tang@intel.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/spi/dw_spi_pci.c b/drivers/spi/dw_spi_pci.c
new file mode 100644
index 0000000..34ba691
--- /dev/null
+++ b/drivers/spi/dw_spi_pci.c
@@ -0,0 +1,169 @@
+/*
+ * mrst_spi_pci.c - PCI interface driver for DW SPI Core
+ *
+ * Copyright (c) 2009, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/spi/dw_spi.h>
+#include <linux/spi/spi.h>
+
+#define DRIVER_NAME "dw_spi_pci"
+
+struct dw_spi_pci {
+ struct pci_dev *pdev;
+ struct dw_spi dws;
+};
+
+static int __devinit spi_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ struct dw_spi_pci *dwpci;
+ struct dw_spi *dws;
+ int pci_bar = 0;
+ int ret;
+
+ printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n",
+ pdev->vendor, pdev->device);
+
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL);
+ if (!dwpci) {
+ ret = -ENOMEM;
+ goto err_disable;
+ }
+
+ dwpci->pdev = pdev;
+ dws = &dwpci->dws;
+
+ /* Get basic io resource and map it */
+ dws->paddr = pci_resource_start(pdev, pci_bar);
+ dws->iolen = pci_resource_len(pdev, pci_bar);
+
+ ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev));
+ if (ret)
+ goto err_kfree;
+
+ dws->regs = ioremap_nocache((unsigned long)dws->paddr,
+ pci_resource_len(pdev, pci_bar));
+ if (!dws->regs) {
+ ret = -ENOMEM;
+ goto err_release_reg;
+ }
+
+ dws->parent_dev = &pdev->dev;
+ dws->bus_num = 0;
+ dws->num_cs = 4;
+ dws->max_freq = 25000000; /* for Moorestwon */
+ dws->irq = pdev->irq;
+
+ ret = dw_spi_add_host(dws);
+ if (ret)
+ goto err_unmap;
+
+ /* PCI hook and SPI hook use the same drv data */
+ pci_set_drvdata(pdev, dwpci);
+ return 0;
+
+err_unmap:
+ iounmap(dws->regs);
+err_release_reg:
+ pci_release_region(pdev, pci_bar);
+err_kfree:
+ kfree(dwpci);
+err_disable:
+ pci_disable_device(pdev);
+ return ret;
+}
+
+static void __devexit spi_pci_remove(struct pci_dev *pdev)
+{
+ struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
+
+ pci_set_drvdata(pdev, NULL);
+ iounmap(dwpci->dws.regs);
+ pci_release_region(pdev, 0);
+ kfree(dwpci);
+ pci_disable_device(pdev);
+}
+
+#ifdef CONFIG_PM
+static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
+ int ret;
+
+ ret = dw_spi_suspend_host(&dwpci->dws);
+ if (ret)
+ return ret;
+ pci_save_state(pdev);
+ pci_disable_device(pdev);
+ pci_set_power_state(pdev, pci_choose_state(pdev, state));
+ return ret;
+}
+
+static int spi_resume(struct pci_dev *pdev)
+{
+ struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
+ int ret;
+
+ pci_set_power_state(pdev, PCI_D0);
+ pci_restore_state(pdev);
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return ret;
+ return dw_spi_resume_host(&dwpci->dws);
+}
+#else
+#define spi_suspend NULL
+#define spi_resume NULL
+#endif
+
+static const struct pci_device_id pci_ids[] __devinitdata = {
+ /* Intel Moorestown platform SPI controller 0 */
+ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
+ {},
+};
+
+static struct pci_driver dw_spi_driver = {
+ .name = DRIVER_NAME,
+ .id_table = pci_ids,
+ .probe = spi_pci_probe,
+ .remove = __devexit_p(spi_pci_remove),
+ .suspend = spi_suspend,
+ .resume = spi_resume,
+};
+
+static int __init mrst_spi_init(void)
+{
+ return pci_register_driver(&dw_spi_driver);
+}
+
+static void __exit mrst_spi_exit(void)
+{
+ pci_unregister_driver(&dw_spi_driver);
+}
+
+module_init(mrst_spi_init);
+module_exit(mrst_spi_exit);
+
+MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
+MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
+MODULE_LICENSE("GPL v2");