From 7063c0d942a1af2993531fbe52b4c74c1db818c4 Mon Sep 17 00:00:00 2001 From: Feng Tang Date: Fri, 24 Dec 2010 13:59:11 +0800 Subject: spi/dw_spi: add DMA support dw_spi driver in upstream only supports PIO mode, and this patch will support it to cowork with the Designware dma controller used on Intel Moorestown platform, at the same time it provides a general framework to support dw_spi core to cowork with dma controllers on other platforms It has been tested with a Option GTM501L 3G modem and Infenion 60x60 modem. To use DMA mode, DMA controller 2 of Moorestown has to be enabled Also change the dma interface suggested by Linus Walleij. Acked-by: Linus Walleij Signed-off-by: Feng Tang [Typo fix and renames to match intel_mid_dma renaming] Signed-off-by: Vinod Koul Signed-off-by: Alan Cox Signed-off-by: Grant Likely --- drivers/spi/dw_spi_pci.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) (limited to 'drivers/spi/dw_spi_pci.c') diff --git a/drivers/spi/dw_spi_pci.c b/drivers/spi/dw_spi_pci.c index 1f52755dc87..49ec3aa1219 100644 --- a/drivers/spi/dw_spi_pci.c +++ b/drivers/spi/dw_spi_pci.c @@ -1,5 +1,5 @@ /* - * mrst_spi_pci.c - PCI interface driver for DW SPI Core + * dw_spi_pci.c - PCI interface driver for DW SPI Core * * Copyright (c) 2009, Intel Corporation. * @@ -26,8 +26,8 @@ #define DRIVER_NAME "dw_spi_pci" struct dw_spi_pci { - struct pci_dev *pdev; - struct dw_spi dws; + struct pci_dev *pdev; + struct dw_spi dws; }; static int __devinit spi_pci_probe(struct pci_dev *pdev, @@ -72,9 +72,17 @@ static int __devinit spi_pci_probe(struct pci_dev *pdev, dws->parent_dev = &pdev->dev; dws->bus_num = 0; dws->num_cs = 4; - dws->max_freq = 25000000; /* for Moorestwon */ dws->irq = pdev->irq; - dws->fifo_len = 40; /* FIFO has 40 words buffer */ + + /* + * Specific handling for Intel MID paltforms, like dma setup, + * clock rate, FIFO depth. + */ + if (pdev->device == 0x0800) { + ret = dw_spi_mid_init(dws); + if (ret) + goto err_unmap; + } ret = dw_spi_add_host(dws); if (ret) @@ -140,7 +148,7 @@ static int spi_resume(struct pci_dev *pdev) #endif static const struct pci_device_id pci_ids[] __devinitdata = { - /* Intel Moorestown platform SPI controller 0 */ + /* Intel MID platform SPI controller 0 */ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) }, {}, }; -- cgit v1.2.3