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