1 /* 2 * NAND Flash Controller Device Driver for DT 3 * 4 * Copyright © 2011, Picochip. 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 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 */ 15 16 #include <linux/clk.h> 17 #include <linux/err.h> 18 #include <linux/io.h> 19 #include <linux/ioport.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/of_device.h> 24 #include <linux/platform_device.h> 25 26 #include "denali.h" 27 28 struct denali_dt { 29 struct denali_nand_info denali; 30 struct clk *clk; 31 }; 32 33 struct denali_dt_data { 34 unsigned int revision; 35 unsigned int caps; 36 const struct nand_ecc_caps *ecc_caps; 37 }; 38 39 NAND_ECC_CAPS_SINGLE(denali_socfpga_ecc_caps, denali_calc_ecc_bytes, 40 512, 8, 15); 41 static const struct denali_dt_data denali_socfpga_data = { 42 .caps = DENALI_CAP_HW_ECC_FIXUP, 43 .ecc_caps = &denali_socfpga_ecc_caps, 44 }; 45 46 NAND_ECC_CAPS_SINGLE(denali_uniphier_v5a_ecc_caps, denali_calc_ecc_bytes, 47 1024, 8, 16, 24); 48 static const struct denali_dt_data denali_uniphier_v5a_data = { 49 .caps = DENALI_CAP_HW_ECC_FIXUP | 50 DENALI_CAP_DMA_64BIT, 51 .ecc_caps = &denali_uniphier_v5a_ecc_caps, 52 }; 53 54 NAND_ECC_CAPS_SINGLE(denali_uniphier_v5b_ecc_caps, denali_calc_ecc_bytes, 55 1024, 8, 16); 56 static const struct denali_dt_data denali_uniphier_v5b_data = { 57 .revision = 0x0501, 58 .caps = DENALI_CAP_HW_ECC_FIXUP | 59 DENALI_CAP_DMA_64BIT, 60 .ecc_caps = &denali_uniphier_v5b_ecc_caps, 61 }; 62 63 static const struct of_device_id denali_nand_dt_ids[] = { 64 { 65 .compatible = "altr,socfpga-denali-nand", 66 .data = &denali_socfpga_data, 67 }, 68 { 69 .compatible = "socionext,uniphier-denali-nand-v5a", 70 .data = &denali_uniphier_v5a_data, 71 }, 72 { 73 .compatible = "socionext,uniphier-denali-nand-v5b", 74 .data = &denali_uniphier_v5b_data, 75 }, 76 { /* sentinel */ } 77 }; 78 MODULE_DEVICE_TABLE(of, denali_nand_dt_ids); 79 80 static int denali_dt_probe(struct platform_device *pdev) 81 { 82 struct resource *res; 83 struct denali_dt *dt; 84 const struct denali_dt_data *data; 85 struct denali_nand_info *denali; 86 int ret; 87 88 dt = devm_kzalloc(&pdev->dev, sizeof(*dt), GFP_KERNEL); 89 if (!dt) 90 return -ENOMEM; 91 denali = &dt->denali; 92 93 data = of_device_get_match_data(&pdev->dev); 94 if (data) { 95 denali->revision = data->revision; 96 denali->caps = data->caps; 97 denali->ecc_caps = data->ecc_caps; 98 } 99 100 denali->dev = &pdev->dev; 101 denali->irq = platform_get_irq(pdev, 0); 102 if (denali->irq < 0) { 103 dev_err(&pdev->dev, "no irq defined\n"); 104 return denali->irq; 105 } 106 107 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "denali_reg"); 108 denali->reg = devm_ioremap_resource(&pdev->dev, res); 109 if (IS_ERR(denali->reg)) 110 return PTR_ERR(denali->reg); 111 112 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data"); 113 denali->host = devm_ioremap_resource(&pdev->dev, res); 114 if (IS_ERR(denali->host)) 115 return PTR_ERR(denali->host); 116 117 dt->clk = devm_clk_get(&pdev->dev, NULL); 118 if (IS_ERR(dt->clk)) { 119 dev_err(&pdev->dev, "no clk available\n"); 120 return PTR_ERR(dt->clk); 121 } 122 ret = clk_prepare_enable(dt->clk); 123 if (ret) 124 return ret; 125 126 /* 127 * Hardcode the clock rate for the backward compatibility. 128 * This works for both SOCFPGA and UniPhier. 129 */ 130 denali->clk_x_rate = 200000000; 131 132 ret = denali_init(denali); 133 if (ret) 134 goto out_disable_clk; 135 136 platform_set_drvdata(pdev, dt); 137 return 0; 138 139 out_disable_clk: 140 clk_disable_unprepare(dt->clk); 141 142 return ret; 143 } 144 145 static int denali_dt_remove(struct platform_device *pdev) 146 { 147 struct denali_dt *dt = platform_get_drvdata(pdev); 148 149 denali_remove(&dt->denali); 150 clk_disable_unprepare(dt->clk); 151 152 return 0; 153 } 154 155 static struct platform_driver denali_dt_driver = { 156 .probe = denali_dt_probe, 157 .remove = denali_dt_remove, 158 .driver = { 159 .name = "denali-nand-dt", 160 .of_match_table = denali_nand_dt_ids, 161 }, 162 }; 163 module_platform_driver(denali_dt_driver); 164 165 MODULE_LICENSE("GPL"); 166 MODULE_AUTHOR("Jamie Iles"); 167 MODULE_DESCRIPTION("DT driver for Denali NAND controller"); 168