>From 08d9f64c47e2c76c6f417a6eb7f8f7f2ce45cb47 Mon Sep 17 00:00:00 2001 From: Feng Tang <feng.t...@intel.com> Date: Sat, 10 Oct 2009 14:57:33 +0800 Subject: [PATCH 2/3] spi: add PCI interface driver for Designware SPI core
This add the PCI interface driver for DW SPI core, it has been tested on Intel Moorestown platform Signed-off-by: Feng Tang <feng.t...@intel.com> --- drivers/spi/Kconfig | 4 + drivers/spi/Makefile | 1 + drivers/spi/dw_spi_pci.c | 169 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 174 insertions(+), 0 deletions(-) create mode 100644 drivers/spi/dw_spi_pci.c diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 6eb9621..bd39e80 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -250,6 +250,10 @@ config SPI_DESIGNWARE help general driver for SPI controller core from DesignWare +config SPI_DW_PCI + tristate "PCI interface driver for DW SPI core" + depends on SPI_DESIGNWARE && PCI + # # Add new SPI master controllers in alphabetical order above this line # diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 5cc4e19..51ebff0 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -34,6 +34,7 @@ obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o obj-$(CONFIG_SPI_STMP3XXX) += spi_stmp.o obj-$(CONFIG_SPI_DESIGNWARE) += dw_spi.o +obj-$(CONFIG_SPI_DW_PCI) += dw_spi_pci.o # ... add above this line ... # SPI protocol drivers (device/link on bus) diff --git a/drivers/spi/dw_spi_pci.c b/drivers/spi/dw_spi_pci.c new file mode 100644 index 0000000..24809c9 --- /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 mrst_spi_suspend NULL +#define mrst_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.t...@intel.com>"); +MODULE_DESCRIPTION("PCI interface driver for DW SPI Core"); +MODULE_LICENSE("GPL v2"); -- 1.6.0.4 ------------------------------------------------------------------------------ Come build with us! 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