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> |
Alexandre Belloni | c2c25cc | 2018-07-27 21:53:56 +0200 | [diff] [blame] | 18 | #include <linux/mfd/syscon.h> |
Paul Gortmaker | d7614de | 2011-07-03 15:44:29 -0400 | [diff] [blame] | 19 | #include <linux/module.h> |
Steffen Trumtrar | 22dae17 | 2014-06-13 15:36:18 +0200 | [diff] [blame] | 20 | #include <linux/of.h> |
Baruch Siach | d9c73bb | 2014-01-31 12:07:47 +0200 | [diff] [blame] | 21 | #include <linux/of_gpio.h> |
Steffen Trumtrar | 22dae17 | 2014-06-13 15:36:18 +0200 | [diff] [blame] | 22 | #include <linux/of_platform.h> |
Andy Shevchenko | 9899995 | 2015-10-14 23:12:25 +0300 | [diff] [blame] | 23 | #include <linux/property.h> |
Alexandre Belloni | c2c25cc | 2018-07-27 21:53:56 +0200 | [diff] [blame] | 24 | #include <linux/regmap.h> |
Grant Likely | 568a60e | 2011-02-28 12:47:12 -0700 | [diff] [blame] | 25 | |
Grant Likely | ca632f5 | 2011-06-06 01:16:30 -0600 | [diff] [blame] | 26 | #include "spi-dw.h" |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 27 | |
| 28 | #define DRIVER_NAME "dw_spi_mmio" |
| 29 | |
| 30 | struct dw_spi_mmio { |
Jean-Hugues Deschenes | 0a4c1d7 | 2010-01-21 09:55:42 -0700 | [diff] [blame] | 31 | struct dw_spi dws; |
| 32 | struct clk *clk; |
Alexandre Belloni | c2c25cc | 2018-07-27 21:53:56 +0200 | [diff] [blame] | 33 | void *priv; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 34 | }; |
| 35 | |
Alexandre Belloni | c2c25cc | 2018-07-27 21:53:56 +0200 | [diff] [blame] | 36 | #define MSCC_CPU_SYSTEM_CTRL_GENERAL_CTRL 0x24 |
| 37 | #define OCELOT_IF_SI_OWNER_MASK GENMASK(5, 4) |
| 38 | #define OCELOT_IF_SI_OWNER_OFFSET 4 |
| 39 | #define MSCC_IF_SI_OWNER_SISL 0 |
| 40 | #define MSCC_IF_SI_OWNER_SIBM 1 |
| 41 | #define MSCC_IF_SI_OWNER_SIMC 2 |
| 42 | |
| 43 | #define MSCC_SPI_MST_SW_MODE 0x14 |
| 44 | #define MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE BIT(13) |
| 45 | #define MSCC_SPI_MST_SW_MODE_SW_SPI_CS(x) (x << 5) |
| 46 | |
| 47 | struct dw_spi_mscc { |
| 48 | struct regmap *syscon; |
| 49 | void __iomem *spi_mst; |
| 50 | }; |
| 51 | |
| 52 | /* |
| 53 | * The Designware SPI controller (referred to as master in the documentation) |
| 54 | * automatically deasserts chip select when the tx fifo is empty. The chip |
| 55 | * selects then needs to be either driven as GPIOs or, for the first 4 using the |
| 56 | * the SPI boot controller registers. the final chip select is an OR gate |
| 57 | * between the Designware SPI controller and the SPI boot controller. |
| 58 | */ |
| 59 | static void dw_spi_mscc_set_cs(struct spi_device *spi, bool enable) |
| 60 | { |
| 61 | struct dw_spi *dws = spi_master_get_devdata(spi->master); |
| 62 | struct dw_spi_mmio *dwsmmio = container_of(dws, struct dw_spi_mmio, dws); |
| 63 | struct dw_spi_mscc *dwsmscc = dwsmmio->priv; |
| 64 | u32 cs = spi->chip_select; |
| 65 | |
| 66 | if (cs < 4) { |
| 67 | u32 sw_mode = MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE; |
| 68 | |
| 69 | if (!enable) |
| 70 | sw_mode |= MSCC_SPI_MST_SW_MODE_SW_SPI_CS(BIT(cs)); |
| 71 | |
| 72 | writel(sw_mode, dwsmscc->spi_mst + MSCC_SPI_MST_SW_MODE); |
| 73 | } |
| 74 | |
| 75 | dw_spi_set_cs(spi, enable); |
| 76 | } |
| 77 | |
| 78 | static int dw_spi_mscc_init(struct platform_device *pdev, |
| 79 | struct dw_spi_mmio *dwsmmio) |
| 80 | { |
| 81 | struct dw_spi_mscc *dwsmscc; |
| 82 | struct resource *res; |
| 83 | |
| 84 | dwsmscc = devm_kzalloc(&pdev->dev, sizeof(*dwsmscc), GFP_KERNEL); |
| 85 | if (!dwsmscc) |
| 86 | return -ENOMEM; |
| 87 | |
| 88 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 89 | dwsmscc->spi_mst = devm_ioremap_resource(&pdev->dev, res); |
| 90 | if (IS_ERR(dwsmscc->spi_mst)) { |
| 91 | dev_err(&pdev->dev, "SPI_MST region map failed\n"); |
| 92 | return PTR_ERR(dwsmscc->spi_mst); |
| 93 | } |
| 94 | |
| 95 | dwsmscc->syscon = syscon_regmap_lookup_by_compatible("mscc,ocelot-cpu-syscon"); |
| 96 | if (IS_ERR(dwsmscc->syscon)) |
| 97 | return PTR_ERR(dwsmscc->syscon); |
| 98 | |
| 99 | /* Deassert all CS */ |
| 100 | writel(0, dwsmscc->spi_mst + MSCC_SPI_MST_SW_MODE); |
| 101 | |
| 102 | /* Select the owner of the SI interface */ |
| 103 | regmap_update_bits(dwsmscc->syscon, MSCC_CPU_SYSTEM_CTRL_GENERAL_CTRL, |
| 104 | OCELOT_IF_SI_OWNER_MASK, |
| 105 | MSCC_IF_SI_OWNER_SIMC << OCELOT_IF_SI_OWNER_OFFSET); |
| 106 | |
| 107 | dwsmmio->dws.set_cs = dw_spi_mscc_set_cs; |
| 108 | dwsmmio->priv = dwsmscc; |
| 109 | |
| 110 | return 0; |
| 111 | } |
| 112 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 113 | static int dw_spi_mmio_probe(struct platform_device *pdev) |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 114 | { |
Alexandre Belloni | c2c25cc | 2018-07-27 21:53:56 +0200 | [diff] [blame] | 115 | int (*init_func)(struct platform_device *pdev, |
| 116 | struct dw_spi_mmio *dwsmmio); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 117 | struct dw_spi_mmio *dwsmmio; |
| 118 | struct dw_spi *dws; |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 119 | struct resource *mem; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 120 | int ret; |
Steffen Trumtrar | 22dae17 | 2014-06-13 15:36:18 +0200 | [diff] [blame] | 121 | int num_cs; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 122 | |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 123 | dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio), |
| 124 | GFP_KERNEL); |
| 125 | if (!dwsmmio) |
| 126 | return -ENOMEM; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 127 | |
| 128 | dws = &dwsmmio->dws; |
| 129 | |
| 130 | /* Get basic io resource and map it */ |
| 131 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 132 | dws->regs = devm_ioremap_resource(&pdev->dev, mem); |
| 133 | if (IS_ERR(dws->regs)) { |
| 134 | dev_err(&pdev->dev, "SPI region map failed\n"); |
| 135 | return PTR_ERR(dws->regs); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 136 | } |
| 137 | |
| 138 | dws->irq = platform_get_irq(pdev, 0); |
| 139 | if (dws->irq < 0) { |
| 140 | dev_err(&pdev->dev, "no irq resource?\n"); |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 141 | return dws->irq; /* -ENXIO */ |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 142 | } |
| 143 | |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 144 | dwsmmio->clk = devm_clk_get(&pdev->dev, NULL); |
| 145 | if (IS_ERR(dwsmmio->clk)) |
| 146 | return PTR_ERR(dwsmmio->clk); |
Baruch Siach | 020fe3f | 2013-12-30 20:30:45 +0200 | [diff] [blame] | 147 | ret = clk_prepare_enable(dwsmmio->clk); |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 148 | if (ret) |
| 149 | return ret; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 150 | |
Baruch Siach | 2418991e | 2014-01-26 10:14:32 +0200 | [diff] [blame] | 151 | dws->bus_num = pdev->id; |
Steffen Trumtrar | 22dae17 | 2014-06-13 15:36:18 +0200 | [diff] [blame] | 152 | |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 153 | dws->max_freq = clk_get_rate(dwsmmio->clk); |
| 154 | |
Andy Shevchenko | 9899995 | 2015-10-14 23:12:25 +0300 | [diff] [blame] | 155 | device_property_read_u32(&pdev->dev, "reg-io-width", &dws->reg_io_width); |
Michael van der Westhuizen | c4fe57f | 2015-08-18 22:21:53 +0200 | [diff] [blame] | 156 | |
Steffen Trumtrar | 22dae17 | 2014-06-13 15:36:18 +0200 | [diff] [blame] | 157 | num_cs = 4; |
| 158 | |
Andy Shevchenko | 9899995 | 2015-10-14 23:12:25 +0300 | [diff] [blame] | 159 | device_property_read_u32(&pdev->dev, "num-cs", &num_cs); |
Steffen Trumtrar | 22dae17 | 2014-06-13 15:36:18 +0200 | [diff] [blame] | 160 | |
| 161 | dws->num_cs = num_cs; |
| 162 | |
Baruch Siach | d9c73bb | 2014-01-31 12:07:47 +0200 | [diff] [blame] | 163 | if (pdev->dev.of_node) { |
| 164 | int i; |
| 165 | |
| 166 | for (i = 0; i < dws->num_cs; i++) { |
| 167 | int cs_gpio = of_get_named_gpio(pdev->dev.of_node, |
| 168 | "cs-gpios", i); |
| 169 | |
| 170 | if (cs_gpio == -EPROBE_DEFER) { |
| 171 | ret = cs_gpio; |
| 172 | goto out; |
| 173 | } |
| 174 | |
| 175 | if (gpio_is_valid(cs_gpio)) { |
| 176 | ret = devm_gpio_request(&pdev->dev, cs_gpio, |
| 177 | dev_name(&pdev->dev)); |
| 178 | if (ret) |
| 179 | goto out; |
| 180 | } |
| 181 | } |
| 182 | } |
| 183 | |
Alexandre Belloni | c2c25cc | 2018-07-27 21:53:56 +0200 | [diff] [blame] | 184 | init_func = device_get_match_data(&pdev->dev); |
| 185 | if (init_func) { |
| 186 | ret = init_func(pdev, dwsmmio); |
| 187 | if (ret) |
| 188 | goto out; |
| 189 | } |
| 190 | |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 191 | ret = dw_spi_add_host(&pdev->dev, dws); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 192 | if (ret) |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 193 | goto out; |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 194 | |
| 195 | platform_set_drvdata(pdev, dwsmmio); |
| 196 | return 0; |
| 197 | |
Baruch Siach | 04f421e | 2013-12-30 20:30:44 +0200 | [diff] [blame] | 198 | out: |
Baruch Siach | 020fe3f | 2013-12-30 20:30:45 +0200 | [diff] [blame] | 199 | clk_disable_unprepare(dwsmmio->clk); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 200 | return ret; |
| 201 | } |
| 202 | |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 203 | static int dw_spi_mmio_remove(struct platform_device *pdev) |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 204 | { |
| 205 | struct dw_spi_mmio *dwsmmio = platform_get_drvdata(pdev); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 206 | |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 207 | dw_spi_remove_host(&dwsmmio->dws); |
Marek Vasut | 400c18e | 2017-04-18 20:09:06 +0200 | [diff] [blame] | 208 | clk_disable_unprepare(dwsmmio->clk); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 209 | |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 210 | return 0; |
| 211 | } |
| 212 | |
Steffen Trumtrar | 22dae17 | 2014-06-13 15:36:18 +0200 | [diff] [blame] | 213 | static const struct of_device_id dw_spi_mmio_of_match[] = { |
| 214 | { .compatible = "snps,dw-apb-ssi", }, |
Alexandre Belloni | c2c25cc | 2018-07-27 21:53:56 +0200 | [diff] [blame] | 215 | { .compatible = "mscc,ocelot-spi", .data = dw_spi_mscc_init}, |
Steffen Trumtrar | 22dae17 | 2014-06-13 15:36:18 +0200 | [diff] [blame] | 216 | { /* end of table */} |
| 217 | }; |
| 218 | MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match); |
| 219 | |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 220 | static struct platform_driver dw_spi_mmio_driver = { |
Grant Likely | 940ab88 | 2011-10-05 11:29:49 -0600 | [diff] [blame] | 221 | .probe = dw_spi_mmio_probe, |
Grant Likely | fd4a319 | 2012-12-07 16:57:14 +0000 | [diff] [blame] | 222 | .remove = dw_spi_mmio_remove, |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 223 | .driver = { |
| 224 | .name = DRIVER_NAME, |
Steffen Trumtrar | 22dae17 | 2014-06-13 15:36:18 +0200 | [diff] [blame] | 225 | .of_match_table = dw_spi_mmio_of_match, |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 226 | }, |
| 227 | }; |
Grant Likely | 940ab88 | 2011-10-05 11:29:49 -0600 | [diff] [blame] | 228 | module_platform_driver(dw_spi_mmio_driver); |
Jean-Hugues Deschenes | f7b6fd6 | 2010-01-21 07:46:42 -0700 | [diff] [blame] | 229 | |
| 230 | MODULE_AUTHOR("Jean-Hugues Deschenes <jean-hugues.deschenes@octasic.com>"); |
| 231 | MODULE_DESCRIPTION("Memory-mapped I/O interface driver for DW SPI Core"); |
| 232 | MODULE_LICENSE("GPL v2"); |