15b92da04SFederico Vaga /* 25b92da04SFederico Vaga * PCI bus driver for Bosch C_CAN/D_CAN controller 35b92da04SFederico Vaga * 45b92da04SFederico Vaga * Copyright (C) 2012 Federico Vaga <federico.vaga@gmail.com> 55b92da04SFederico Vaga * 65b92da04SFederico Vaga * Borrowed from c_can_platform.c 75b92da04SFederico Vaga * 85b92da04SFederico Vaga * This file is licensed under the terms of the GNU General Public 95b92da04SFederico Vaga * License version 2. This program is licensed "as is" without any 105b92da04SFederico Vaga * warranty of any kind, whether express or implied. 115b92da04SFederico Vaga */ 125b92da04SFederico Vaga 135b92da04SFederico Vaga #include <linux/kernel.h> 145b92da04SFederico Vaga #include <linux/module.h> 155b92da04SFederico Vaga #include <linux/netdevice.h> 165b92da04SFederico Vaga #include <linux/pci.h> 175b92da04SFederico Vaga 185b92da04SFederico Vaga #include <linux/can/dev.h> 195b92da04SFederico Vaga 205b92da04SFederico Vaga #include "c_can.h" 215b92da04SFederico Vaga 22abcd7f75SAlexander Stein #define PCI_DEVICE_ID_PCH_CAN 0x8818 23abcd7f75SAlexander Stein #define PCH_PCI_SOFT_RESET 0x01fc 24abcd7f75SAlexander Stein 255b92da04SFederico Vaga enum c_can_pci_reg_align { 265b92da04SFederico Vaga C_CAN_REG_ALIGN_16, 275b92da04SFederico Vaga C_CAN_REG_ALIGN_32, 28abcd7f75SAlexander Stein C_CAN_REG_32, 295b92da04SFederico Vaga }; 305b92da04SFederico Vaga 315b92da04SFederico Vaga struct c_can_pci_data { 325b92da04SFederico Vaga /* Specify if is C_CAN or D_CAN */ 335b92da04SFederico Vaga enum c_can_dev_id type; 345b92da04SFederico Vaga /* Set the register alignment in the memory */ 355b92da04SFederico Vaga enum c_can_pci_reg_align reg_align; 361aa2d1daSMarc Kleine-Budde /* Set the frequency */ 375b92da04SFederico Vaga unsigned int freq; 38abcd7f75SAlexander Stein /* PCI bar number */ 39abcd7f75SAlexander Stein int bar; 40abcd7f75SAlexander Stein /* Callback for reset */ 41abcd7f75SAlexander Stein void (*init)(const struct c_can_priv *priv, bool enable); 425b92da04SFederico Vaga }; 435b92da04SFederico Vaga 445b92da04SFederico Vaga /* 455b92da04SFederico Vaga * 16-bit c_can registers can be arranged differently in the memory 465b92da04SFederico Vaga * architecture of different implementations. For example: 16-bit 475b92da04SFederico Vaga * registers can be aligned to a 16-bit boundary or 32-bit boundary etc. 485b92da04SFederico Vaga * Handle the same by providing a common read/write interface. 495b92da04SFederico Vaga */ 50e07e83aeSPavel Machek static u16 c_can_pci_read_reg_aligned_to_16bit(const struct c_can_priv *priv, 515b92da04SFederico Vaga enum reg index) 525b92da04SFederico Vaga { 535b92da04SFederico Vaga return readw(priv->base + priv->regs[index]); 545b92da04SFederico Vaga } 555b92da04SFederico Vaga 56e07e83aeSPavel Machek static void c_can_pci_write_reg_aligned_to_16bit(const struct c_can_priv *priv, 575b92da04SFederico Vaga enum reg index, u16 val) 585b92da04SFederico Vaga { 595b92da04SFederico Vaga writew(val, priv->base + priv->regs[index]); 605b92da04SFederico Vaga } 615b92da04SFederico Vaga 62e07e83aeSPavel Machek static u16 c_can_pci_read_reg_aligned_to_32bit(const struct c_can_priv *priv, 635b92da04SFederico Vaga enum reg index) 645b92da04SFederico Vaga { 655b92da04SFederico Vaga return readw(priv->base + 2 * priv->regs[index]); 665b92da04SFederico Vaga } 675b92da04SFederico Vaga 68e07e83aeSPavel Machek static void c_can_pci_write_reg_aligned_to_32bit(const struct c_can_priv *priv, 695b92da04SFederico Vaga enum reg index, u16 val) 705b92da04SFederico Vaga { 715b92da04SFederico Vaga writew(val, priv->base + 2 * priv->regs[index]); 725b92da04SFederico Vaga } 735b92da04SFederico Vaga 74e07e83aeSPavel Machek static u16 c_can_pci_read_reg_32bit(const struct c_can_priv *priv, 75abcd7f75SAlexander Stein enum reg index) 76abcd7f75SAlexander Stein { 77abcd7f75SAlexander Stein return (u16)ioread32(priv->base + 2 * priv->regs[index]); 78abcd7f75SAlexander Stein } 79abcd7f75SAlexander Stein 80e07e83aeSPavel Machek static void c_can_pci_write_reg_32bit(const struct c_can_priv *priv, 81abcd7f75SAlexander Stein enum reg index, u16 val) 82abcd7f75SAlexander Stein { 83abcd7f75SAlexander Stein iowrite32((u32)val, priv->base + 2 * priv->regs[index]); 84abcd7f75SAlexander Stein } 85abcd7f75SAlexander Stein 86abcd7f75SAlexander Stein static void c_can_pci_reset_pch(const struct c_can_priv *priv, bool enable) 87abcd7f75SAlexander Stein { 88abcd7f75SAlexander Stein if (enable) { 89abcd7f75SAlexander Stein u32 __iomem *addr = priv->base + PCH_PCI_SOFT_RESET; 90abcd7f75SAlexander Stein 91abcd7f75SAlexander Stein /* write to sw reset register */ 92abcd7f75SAlexander Stein iowrite32(1, addr); 93abcd7f75SAlexander Stein iowrite32(0, addr); 94abcd7f75SAlexander Stein } 95abcd7f75SAlexander Stein } 96abcd7f75SAlexander Stein 973c8ac0f2SBill Pemberton static int c_can_pci_probe(struct pci_dev *pdev, 985b92da04SFederico Vaga const struct pci_device_id *ent) 995b92da04SFederico Vaga { 1005b92da04SFederico Vaga struct c_can_pci_data *c_can_pci_data = (void *)ent->driver_data; 1015b92da04SFederico Vaga struct c_can_priv *priv; 1025b92da04SFederico Vaga struct net_device *dev; 1035b92da04SFederico Vaga void __iomem *addr; 1045b92da04SFederico Vaga int ret; 1055b92da04SFederico Vaga 1065b92da04SFederico Vaga ret = pci_enable_device(pdev); 1075b92da04SFederico Vaga if (ret) { 1085b92da04SFederico Vaga dev_err(&pdev->dev, "pci_enable_device FAILED\n"); 1095b92da04SFederico Vaga goto out; 1105b92da04SFederico Vaga } 1115b92da04SFederico Vaga 1125b92da04SFederico Vaga ret = pci_request_regions(pdev, KBUILD_MODNAME); 1135b92da04SFederico Vaga if (ret) { 1145b92da04SFederico Vaga dev_err(&pdev->dev, "pci_request_regions FAILED\n"); 1155b92da04SFederico Vaga goto out_disable_device; 1165b92da04SFederico Vaga } 1175b92da04SFederico Vaga 11878c181bcSWolfgang Grandegger ret = pci_enable_msi(pdev); 11978c181bcSWolfgang Grandegger if (!ret) { 12078c181bcSWolfgang Grandegger dev_info(&pdev->dev, "MSI enabled\n"); 1215b92da04SFederico Vaga pci_set_master(pdev); 12278c181bcSWolfgang Grandegger } 1235b92da04SFederico Vaga 124abcd7f75SAlexander Stein addr = pci_iomap(pdev, c_can_pci_data->bar, 125abcd7f75SAlexander Stein pci_resource_len(pdev, c_can_pci_data->bar)); 1265b92da04SFederico Vaga if (!addr) { 1275b92da04SFederico Vaga dev_err(&pdev->dev, 1285b92da04SFederico Vaga "device has no PCI memory resources, " 1295b92da04SFederico Vaga "failing adapter\n"); 1305b92da04SFederico Vaga ret = -ENOMEM; 1315b92da04SFederico Vaga goto out_release_regions; 1325b92da04SFederico Vaga } 1335b92da04SFederico Vaga 1345b92da04SFederico Vaga /* allocate the c_can device */ 1355b92da04SFederico Vaga dev = alloc_c_can_dev(); 1365b92da04SFederico Vaga if (!dev) { 1375b92da04SFederico Vaga ret = -ENOMEM; 1385b92da04SFederico Vaga goto out_iounmap; 1395b92da04SFederico Vaga } 1405b92da04SFederico Vaga 1415b92da04SFederico Vaga priv = netdev_priv(dev); 1425b92da04SFederico Vaga pci_set_drvdata(pdev, dev); 1435b92da04SFederico Vaga SET_NETDEV_DEV(dev, &pdev->dev); 1445b92da04SFederico Vaga 1455b92da04SFederico Vaga dev->irq = pdev->irq; 1465b92da04SFederico Vaga priv->base = addr; 1475b92da04SFederico Vaga 1485b92da04SFederico Vaga if (!c_can_pci_data->freq) { 1491aa2d1daSMarc Kleine-Budde dev_err(&pdev->dev, "no clock frequency defined\n"); 1505b92da04SFederico Vaga ret = -ENODEV; 1515b92da04SFederico Vaga goto out_free_c_can; 1525b92da04SFederico Vaga } else { 1535b92da04SFederico Vaga priv->can.clock.freq = c_can_pci_data->freq; 1545b92da04SFederico Vaga } 1555b92da04SFederico Vaga 1565b92da04SFederico Vaga /* Configure CAN type */ 1575b92da04SFederico Vaga switch (c_can_pci_data->type) { 158f27b1db9SAnilKumar Ch case BOSCH_C_CAN: 1595b92da04SFederico Vaga priv->regs = reg_map_c_can; 1605b92da04SFederico Vaga break; 161f27b1db9SAnilKumar Ch case BOSCH_D_CAN: 1625b92da04SFederico Vaga priv->regs = reg_map_d_can; 1635b92da04SFederico Vaga priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; 1645b92da04SFederico Vaga break; 1655b92da04SFederico Vaga default: 1665b92da04SFederico Vaga ret = -EINVAL; 1671aa2d1daSMarc Kleine-Budde goto out_free_c_can; 1685b92da04SFederico Vaga } 1695b92da04SFederico Vaga 170129eef21SThomas Gleixner priv->type = c_can_pci_data->type; 171129eef21SThomas Gleixner 1725b92da04SFederico Vaga /* Configure access to registers */ 1735b92da04SFederico Vaga switch (c_can_pci_data->reg_align) { 1745b92da04SFederico Vaga case C_CAN_REG_ALIGN_32: 1755b92da04SFederico Vaga priv->read_reg = c_can_pci_read_reg_aligned_to_32bit; 1765b92da04SFederico Vaga priv->write_reg = c_can_pci_write_reg_aligned_to_32bit; 1775b92da04SFederico Vaga break; 1785b92da04SFederico Vaga case C_CAN_REG_ALIGN_16: 1795b92da04SFederico Vaga priv->read_reg = c_can_pci_read_reg_aligned_to_16bit; 1805b92da04SFederico Vaga priv->write_reg = c_can_pci_write_reg_aligned_to_16bit; 1815b92da04SFederico Vaga break; 182abcd7f75SAlexander Stein case C_CAN_REG_32: 183abcd7f75SAlexander Stein priv->read_reg = c_can_pci_read_reg_32bit; 184abcd7f75SAlexander Stein priv->write_reg = c_can_pci_write_reg_32bit; 185abcd7f75SAlexander Stein break; 1865b92da04SFederico Vaga default: 1875b92da04SFederico Vaga ret = -EINVAL; 1881aa2d1daSMarc Kleine-Budde goto out_free_c_can; 1895b92da04SFederico Vaga } 1905b92da04SFederico Vaga 191abcd7f75SAlexander Stein priv->raminit = c_can_pci_data->init; 192abcd7f75SAlexander Stein 1935b92da04SFederico Vaga ret = register_c_can_dev(dev); 1945b92da04SFederico Vaga if (ret) { 1955b92da04SFederico Vaga dev_err(&pdev->dev, "registering %s failed (err=%d)\n", 1965b92da04SFederico Vaga KBUILD_MODNAME, ret); 1971aa2d1daSMarc Kleine-Budde goto out_free_c_can; 1985b92da04SFederico Vaga } 1995b92da04SFederico Vaga 2005b92da04SFederico Vaga dev_dbg(&pdev->dev, "%s device registered (regs=%p, irq=%d)\n", 2015b92da04SFederico Vaga KBUILD_MODNAME, priv->regs, dev->irq); 2025b92da04SFederico Vaga 2035b92da04SFederico Vaga return 0; 2045b92da04SFederico Vaga 2055b92da04SFederico Vaga out_free_c_can: 2065b92da04SFederico Vaga free_c_can_dev(dev); 2075b92da04SFederico Vaga out_iounmap: 2085b92da04SFederico Vaga pci_iounmap(pdev, addr); 2095b92da04SFederico Vaga out_release_regions: 2105b92da04SFederico Vaga pci_disable_msi(pdev); 2115b92da04SFederico Vaga pci_clear_master(pdev); 2125b92da04SFederico Vaga pci_release_regions(pdev); 2135b92da04SFederico Vaga out_disable_device: 2145b92da04SFederico Vaga pci_disable_device(pdev); 2155b92da04SFederico Vaga out: 2165b92da04SFederico Vaga return ret; 2175b92da04SFederico Vaga } 2185b92da04SFederico Vaga 2193c8ac0f2SBill Pemberton static void c_can_pci_remove(struct pci_dev *pdev) 2205b92da04SFederico Vaga { 2215b92da04SFederico Vaga struct net_device *dev = pci_get_drvdata(pdev); 2225b92da04SFederico Vaga struct c_can_priv *priv = netdev_priv(dev); 2235b92da04SFederico Vaga 2245b92da04SFederico Vaga unregister_c_can_dev(dev); 2255b92da04SFederico Vaga 2265b92da04SFederico Vaga free_c_can_dev(dev); 2275b92da04SFederico Vaga 2285b92da04SFederico Vaga pci_iounmap(pdev, priv->base); 2295b92da04SFederico Vaga pci_disable_msi(pdev); 2305b92da04SFederico Vaga pci_clear_master(pdev); 2315b92da04SFederico Vaga pci_release_regions(pdev); 2325b92da04SFederico Vaga pci_disable_device(pdev); 2335b92da04SFederico Vaga } 2345b92da04SFederico Vaga 2355b92da04SFederico Vaga static struct c_can_pci_data c_can_sta2x11= { 236f27b1db9SAnilKumar Ch .type = BOSCH_C_CAN, 2375b92da04SFederico Vaga .reg_align = C_CAN_REG_ALIGN_32, 2385b92da04SFederico Vaga .freq = 52000000, /* 52 Mhz */ 239abcd7f75SAlexander Stein .bar = 0, 240abcd7f75SAlexander Stein }; 241abcd7f75SAlexander Stein 242abcd7f75SAlexander Stein static struct c_can_pci_data c_can_pch = { 243abcd7f75SAlexander Stein .type = BOSCH_C_CAN, 244abcd7f75SAlexander Stein .reg_align = C_CAN_REG_32, 245abcd7f75SAlexander Stein .freq = 50000000, /* 50 MHz */ 246abcd7f75SAlexander Stein .init = c_can_pci_reset_pch, 247abcd7f75SAlexander Stein .bar = 1, 2485b92da04SFederico Vaga }; 2495b92da04SFederico Vaga 2505b92da04SFederico Vaga #define C_CAN_ID(_vend, _dev, _driverdata) { \ 2515b92da04SFederico Vaga PCI_DEVICE(_vend, _dev), \ 2525b92da04SFederico Vaga .driver_data = (unsigned long)&_driverdata, \ 2535b92da04SFederico Vaga } 2545b92da04SFederico Vaga static DEFINE_PCI_DEVICE_TABLE(c_can_pci_tbl) = { 2555b92da04SFederico Vaga C_CAN_ID(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_CAN, 2565b92da04SFederico Vaga c_can_sta2x11), 257abcd7f75SAlexander Stein C_CAN_ID(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PCH_CAN, 258abcd7f75SAlexander Stein c_can_pch), 2595b92da04SFederico Vaga {}, 2605b92da04SFederico Vaga }; 2615b92da04SFederico Vaga static struct pci_driver c_can_pci_driver = { 2625b92da04SFederico Vaga .name = KBUILD_MODNAME, 2635b92da04SFederico Vaga .id_table = c_can_pci_tbl, 2645b92da04SFederico Vaga .probe = c_can_pci_probe, 2653c8ac0f2SBill Pemberton .remove = c_can_pci_remove, 2665b92da04SFederico Vaga }; 2675b92da04SFederico Vaga 2685b92da04SFederico Vaga module_pci_driver(c_can_pci_driver); 2695b92da04SFederico Vaga 2705b92da04SFederico Vaga MODULE_AUTHOR("Federico Vaga <federico.vaga@gmail.com>"); 2715b92da04SFederico Vaga MODULE_LICENSE("GPL v2"); 2725b92da04SFederico Vaga MODULE_DESCRIPTION("PCI CAN bus driver for Bosch C_CAN/D_CAN controller"); 2735b92da04SFederico Vaga MODULE_DEVICE_TABLE(pci, c_can_pci_tbl); 274