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