Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 1 | /* |
Grant Likely | ca632f5 | 2011-06-06 01:16:30 -0600 | [diff] [blame] | 2 | * Memory-mapped interface driver for DW SPI Core |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (c) 2010, Octasic semiconductor. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/clk.h> |
Jamie Iles | 50c01fc | 2011-01-11 12:43:52 +0000 | [diff] [blame] | 12 | #include <linux/err.h> |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/platform_device.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 16 | #include <linux/spi/spi.h> |
Grant Likely | 568a60e | 2011-02-28 12:47:12 -0700 | [diff] [blame] | 17 | #include <linux/scatterlist.h> |
Paul Gortmaker | d7614de | 2011-07-03 15:44:29 -0400 | [diff] [blame] | 18 | #include <linux/module.h> |
Grant Likely | 568a60e | 2011-02-28 12:47:12 -0700 | [diff] [blame] | 19 | |
Grant Likely | ca632f5 | 2011-06-06 01:16:30 -0600 | [diff] [blame] | 20 | #include "spi-dw.h" |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 21 | |
| 22 | #define DRIVER_NAME "dw_spi_mmio" |
| 23 | |
| 24 | struct dw_spi_mmio { |
Jean-Hugues Deschenes | 0a4c1d7 | 2010-01-21 09:55:42 -0700 | [diff] [blame] | 25 | struct dw_spi dws; |
| 26 | struct clk *clk; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 27 | }; |
| 28 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 29 | static int dw_spi_mmio_probe(struct platform_device *pdev) |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 30 | { |
| 31 | struct dw_spi_mmio *dwsmmio; |
| 32 | struct dw_spi *dws; |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 33 | struct resource *mem; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 34 | int ret; |
| 35 | |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 36 | dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio), |
| 37 | GFP_KERNEL); |
| 38 | if (!dwsmmio) |
| 39 | return -ENOMEM; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 40 | |
| 41 | dws = &dwsmmio->dws; |
| 42 | |
| 43 | /* Get basic io resource and map it */ |
| 44 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 45 | if (!mem) { |
| 46 | dev_err(&pdev->dev, "no mem resource?\n"); |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 47 | return -EINVAL; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 48 | } |
| 49 | |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 50 | dws->regs = devm_ioremap_resource(&pdev->dev, mem); |
| 51 | if (IS_ERR(dws->regs)) { |
| 52 | dev_err(&pdev->dev, "SPI region map failed\n"); |
| 53 | return PTR_ERR(dws->regs); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 54 | } |
| 55 | |
| 56 | dws->irq = platform_get_irq(pdev, 0); |
| 57 | if (dws->irq < 0) { |
| 58 | dev_err(&pdev->dev, "no irq resource?\n"); |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 59 | return dws->irq; /* -ENXIO */ |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 60 | } |
| 61 | |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 62 | dwsmmio->clk = devm_clk_get(&pdev->dev, NULL); |
| 63 | if (IS_ERR(dwsmmio->clk)) |
| 64 | return PTR_ERR(dwsmmio->clk); |
Baruch Siach | 020fe3f | 2013-12-30 20:30:45 +0200 | [diff] [blame] | 65 | ret = clk_prepare_enable(dwsmmio->clk); |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 66 | if (ret) |
| 67 | return ret; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 68 | |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 69 | dws->bus_num = 0; |
| 70 | dws->num_cs = 4; |
| 71 | dws->max_freq = clk_get_rate(dwsmmio->clk); |
| 72 | |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 73 | ret = dw_spi_add_host(&pdev->dev, dws); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 74 | if (ret) |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 75 | goto out; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 76 | |
| 77 | platform_set_drvdata(pdev, dwsmmio); |
| 78 | return 0; |
| 79 | |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 80 | out: |
Baruch Siach | 020fe3f | 2013-12-30 20:30:45 +0200 | [diff] [blame] | 81 | clk_disable_unprepare(dwsmmio->clk); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 82 | return ret; |
| 83 | } |
| 84 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 85 | static int dw_spi_mmio_remove(struct platform_device *pdev) |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 86 | { |
| 87 | struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 88 | |
Baruch Siach | 020fe3f | 2013-12-30 20:30:45 +0200 | [diff] [blame] | 89 | clk_disable_unprepare(dwsmmio->clk); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 90 | dw_spi_remove_host(&dwsmmio->dws); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 91 | |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static struct platform_driver dw_spi_mmio_driver = { |
Grant Likely | 940ab88 | 2011-10-05 11:29:49 -0600 | [diff] [blame] | 96 | .probe = dw_spi_mmio_probe, |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 97 | .remove = dw_spi_mmio_remove, |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 98 | .driver = { |
| 99 | .name = DRIVER_NAME, |
| 100 | .owner = THIS_MODULE, |
| 101 | }, |
| 102 | }; |
Grant Likely | 940ab88 | 2011-10-05 11:29:49 -0600 | [diff] [blame] | 103 | module_platform_driver(dw_spi_mmio_driver); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 104 | |
| 105 | MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); |
| 106 | MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); |
| 107 | MODULE_LICENSE("GPL v2"); |