1 // SPDX-License-Identifier: GPL-2.0 2 // IOMapped CAN bus driver for Bosch M_CAN controller 3 // Copyright (C) 2014 Freescale Semiconductor, Inc. 4 // Dong Aisheng <b29396@freescale.com> 5 // 6 // Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/ 7 8 #include <linux/platform_device.h> 9 10 #include "m_can.h" 11 12 struct m_can_plat_priv { 13 struct m_can_classdev cdev; 14 15 void __iomem *base; 16 void __iomem *mram_base; 17 }; 18 19 static inline struct m_can_plat_priv *cdev_to_priv(struct m_can_classdev *cdev) 20 { 21 return container_of(cdev, struct m_can_plat_priv, cdev); 22 } 23 24 static u32 iomap_read_reg(struct m_can_classdev *cdev, int reg) 25 { 26 struct m_can_plat_priv *priv = cdev_to_priv(cdev); 27 28 return readl(priv->base + reg); 29 } 30 31 static u32 iomap_read_fifo(struct m_can_classdev *cdev, int offset) 32 { 33 struct m_can_plat_priv *priv = cdev_to_priv(cdev); 34 35 return readl(priv->mram_base + offset); 36 } 37 38 static int iomap_write_reg(struct m_can_classdev *cdev, int reg, int val) 39 { 40 struct m_can_plat_priv *priv = cdev_to_priv(cdev); 41 42 writel(val, priv->base + reg); 43 44 return 0; 45 } 46 47 static int iomap_write_fifo(struct m_can_classdev *cdev, int offset, int val) 48 { 49 struct m_can_plat_priv *priv = cdev_to_priv(cdev); 50 51 writel(val, priv->mram_base + offset); 52 53 return 0; 54 } 55 56 static struct m_can_ops m_can_plat_ops = { 57 .read_reg = iomap_read_reg, 58 .write_reg = iomap_write_reg, 59 .write_fifo = iomap_write_fifo, 60 .read_fifo = iomap_read_fifo, 61 }; 62 63 static int m_can_plat_probe(struct platform_device *pdev) 64 { 65 struct m_can_classdev *mcan_class; 66 struct m_can_plat_priv *priv; 67 struct resource *res; 68 void __iomem *addr; 69 void __iomem *mram_addr; 70 int irq, ret = 0; 71 72 mcan_class = m_can_class_allocate_dev(&pdev->dev, 73 sizeof(struct m_can_plat_priv)); 74 if (!mcan_class) 75 return -ENOMEM; 76 77 priv = cdev_to_priv(mcan_class); 78 79 ret = m_can_class_get_clocks(mcan_class); 80 if (ret) 81 goto probe_fail; 82 83 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can"); 84 addr = devm_ioremap_resource(&pdev->dev, res); 85 irq = platform_get_irq_byname(pdev, "int0"); 86 if (IS_ERR(addr) || irq < 0) { 87 ret = -EINVAL; 88 goto probe_fail; 89 } 90 91 /* message ram could be shared */ 92 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); 93 if (!res) { 94 ret = -ENODEV; 95 goto probe_fail; 96 } 97 98 mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res)); 99 if (!mram_addr) { 100 ret = -ENOMEM; 101 goto probe_fail; 102 } 103 104 priv->base = addr; 105 priv->mram_base = mram_addr; 106 107 mcan_class->net->irq = irq; 108 mcan_class->pm_clock_support = 1; 109 mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk); 110 mcan_class->dev = &pdev->dev; 111 112 mcan_class->ops = &m_can_plat_ops; 113 114 mcan_class->is_peripheral = false; 115 116 platform_set_drvdata(pdev, mcan_class); 117 118 m_can_init_ram(mcan_class); 119 120 pm_runtime_enable(mcan_class->dev); 121 ret = m_can_class_register(mcan_class); 122 if (ret) 123 goto out_runtime_disable; 124 125 return ret; 126 127 out_runtime_disable: 128 pm_runtime_disable(mcan_class->dev); 129 probe_fail: 130 m_can_class_free_dev(mcan_class->net); 131 return ret; 132 } 133 134 static __maybe_unused int m_can_suspend(struct device *dev) 135 { 136 return m_can_class_suspend(dev); 137 } 138 139 static __maybe_unused int m_can_resume(struct device *dev) 140 { 141 return m_can_class_resume(dev); 142 } 143 144 static int m_can_plat_remove(struct platform_device *pdev) 145 { 146 struct m_can_plat_priv *priv = platform_get_drvdata(pdev); 147 struct m_can_classdev *mcan_class = &priv->cdev; 148 149 m_can_class_unregister(mcan_class); 150 151 m_can_class_free_dev(mcan_class->net); 152 153 return 0; 154 } 155 156 static int __maybe_unused m_can_runtime_suspend(struct device *dev) 157 { 158 struct m_can_plat_priv *priv = dev_get_drvdata(dev); 159 struct m_can_classdev *mcan_class = &priv->cdev; 160 161 clk_disable_unprepare(mcan_class->cclk); 162 clk_disable_unprepare(mcan_class->hclk); 163 164 return 0; 165 } 166 167 static int __maybe_unused m_can_runtime_resume(struct device *dev) 168 { 169 struct m_can_plat_priv *priv = dev_get_drvdata(dev); 170 struct m_can_classdev *mcan_class = &priv->cdev; 171 int err; 172 173 err = clk_prepare_enable(mcan_class->hclk); 174 if (err) 175 return err; 176 177 err = clk_prepare_enable(mcan_class->cclk); 178 if (err) 179 clk_disable_unprepare(mcan_class->hclk); 180 181 return err; 182 } 183 184 static const struct dev_pm_ops m_can_pmops = { 185 SET_RUNTIME_PM_OPS(m_can_runtime_suspend, 186 m_can_runtime_resume, NULL) 187 SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume) 188 }; 189 190 static const struct of_device_id m_can_of_table[] = { 191 { .compatible = "bosch,m_can", .data = NULL }, 192 { /* sentinel */ }, 193 }; 194 MODULE_DEVICE_TABLE(of, m_can_of_table); 195 196 static struct platform_driver m_can_plat_driver = { 197 .driver = { 198 .name = KBUILD_MODNAME, 199 .of_match_table = m_can_of_table, 200 .pm = &m_can_pmops, 201 }, 202 .probe = m_can_plat_probe, 203 .remove = m_can_plat_remove, 204 }; 205 206 module_platform_driver(m_can_plat_driver); 207 208 MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>"); 209 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); 210 MODULE_LICENSE("GPL v2"); 211 MODULE_DESCRIPTION("M_CAN driver for IO Mapped Bosch controllers"); 212