brintos

brintos / linux-shallow public Read only

0
0
Text · 11.8 KiB · 5bca719 Raw
432 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2007 Wolfgang Grandegger <wg@grandegger.com>4 * Copyright (C) 2008 Markus Plessing <plessing@ems-wuensche.com>5 * Copyright (C) 2008 Sebastian Haas <haas@ems-wuensche.com>6 * Copyright (C) 2023 EMS Dr. Thomas Wuensche7 */8 9#include <linux/kernel.h>10#include <linux/module.h>11#include <linux/interrupt.h>12#include <linux/netdevice.h>13#include <linux/delay.h>14#include <linux/slab.h>15#include <linux/pci.h>16#include <linux/can/dev.h>17#include <linux/io.h>18 19#include "sja1000.h"20 21#define DRV_NAME  "ems_pci"22 23MODULE_AUTHOR("Sebastian Haas <support@ems-wuensche.com>");24MODULE_AUTHOR("Gerhard Uttenthaler <uttenthaler@ems-wuensche.com>");25MODULE_DESCRIPTION("Socket-CAN driver for EMS CPC-PCI/PCIe/104P CAN cards");26MODULE_LICENSE("GPL v2");27 28#define EMS_PCI_V1_MAX_CHAN 229#define EMS_PCI_V2_MAX_CHAN 430#define EMS_PCI_V3_MAX_CHAN 431#define EMS_PCI_MAX_CHAN    EMS_PCI_V2_MAX_CHAN32 33struct ems_pci_card {34	int version;35	int channels;36 37	struct pci_dev *pci_dev;38	struct net_device *net_dev[EMS_PCI_MAX_CHAN];39 40	void __iomem *conf_addr;41	void __iomem *base_addr;42};43 44#define EMS_PCI_CAN_CLOCK (16000000 / 2)45 46/* Register definitions and descriptions are from LinCAN 0.3.3.47 *48 * PSB4610 PITA-2 bridge control registers49 */50#define PITA2_ICR           0x00	/* Interrupt Control Register */51#define PITA2_ICR_INT0      0x00000002	/* [RC] INT0 Active/Clear */52#define PITA2_ICR_INT0_EN   0x00020000	/* [RW] Enable INT0 */53 54#define PITA2_MISC          0x1c	/* Miscellaneous Register */55#define PITA2_MISC_CONFIG   0x04000000	/* Multiplexed parallel interface */56 57/* Register definitions for the PLX 903058 */59#define PLX_ICSR            0x4c   /* Interrupt Control/Status register */60#define PLX_ICSR_LINTI1_ENA 0x0001 /* LINTi1 Enable */61#define PLX_ICSR_PCIINT_ENA 0x0040 /* PCI Interrupt Enable */62#define PLX_ICSR_LINTI1_CLR 0x0400 /* Local Edge Triggerable Interrupt Clear */63#define PLX_ICSR_ENA_CLR    (PLX_ICSR_LINTI1_ENA | PLX_ICSR_PCIINT_ENA | \64			     PLX_ICSR_LINTI1_CLR)65 66/* Register definitions for the ASIX9910067 */68#define ASIX_LINTSR 0x28 /* Interrupt Control/Status register */69#define ASIX_LINTSR_INT0AC BIT(0) /* Writing 1 enables or clears interrupt */70 71#define ASIX_LIEMR 0x24 /* Local Interrupt Enable / Miscellaneous Register */72#define ASIX_LIEMR_L0EINTEN BIT(16) /* Local INT0 input assertion enable */73#define ASIX_LIEMR_LRST BIT(14) /* Local Reset assert */74 75/* The board configuration is probably following:76 * RX1 is connected to ground.77 * TX1 is not connected.78 * CLKO is not connected.79 * Setting the OCR register to 0xDA is a good idea.80 * This means normal output mode, push-pull and the correct polarity.81 */82#define EMS_PCI_OCR         (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)83 84/* In the CDR register, you should set CBP to 1.85 * You will probably also want to set the clock divider value to 786 * (meaning direct oscillator output) because the second SJA1000 chip87 * is driven by the first one CLKOUT output.88 */89#define EMS_PCI_CDR             (CDR_CBP | CDR_CLKOUT_MASK)90 91#define EMS_PCI_V1_BASE_BAR 192#define EMS_PCI_V1_CONF_BAR 093#define EMS_PCI_V1_CONF_SIZE 4096 /* size of PITA control area */94#define EMS_PCI_V1_CAN_BASE_OFFSET 0x400 /* offset where the controllers start */95#define EMS_PCI_V1_CAN_CTRL_SIZE 0x200 /* memory size for each controller */96 97#define EMS_PCI_V2_BASE_BAR 298#define EMS_PCI_V2_CONF_BAR 099#define EMS_PCI_V2_CONF_SIZE 128 /* size of PLX control area */100#define EMS_PCI_V2_CAN_BASE_OFFSET 0x400 /* offset where the controllers start */101#define EMS_PCI_V2_CAN_CTRL_SIZE 0x200 /* memory size for each controller */102 103#define EMS_PCI_V3_BASE_BAR 0104#define EMS_PCI_V3_CONF_BAR 5105#define EMS_PCI_V3_CONF_SIZE 128 /* size of ASIX control area */106#define EMS_PCI_V3_CAN_BASE_OFFSET 0x00 /* offset where the controllers starts */107#define EMS_PCI_V3_CAN_CTRL_SIZE 0x100 /* memory size for each controller */108 109#define EMS_PCI_BASE_SIZE  4096 /* size of controller area */110 111#define PCI_SUBDEVICE_ID_EMS 0x4010112 113static const struct pci_device_id ems_pci_tbl[] = {114	/* CPC-PCI v1 */115	{PCI_VENDOR_ID_SIEMENS, 0x2104, PCI_ANY_ID, PCI_ANY_ID,},116	/* CPC-PCI v2 */117	{PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030, PCI_VENDOR_ID_PLX, 0x4000},118	/* CPC-104P v2 */119	{PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030, PCI_VENDOR_ID_PLX, 0x4002},120	/* CPC-PCIe v3 */121	{PCI_VENDOR_ID_ASIX, PCI_DEVICE_ID_ASIX_AX99100_LB, 0xa000, PCI_SUBDEVICE_ID_EMS},122	{0,}123};124MODULE_DEVICE_TABLE(pci, ems_pci_tbl);125 126/* Helper to read internal registers from card logic (not CAN)127 */128static u8 ems_pci_v1_readb(struct ems_pci_card *card, unsigned int port)129{130	return readb(card->base_addr + (port * 4));131}132 133static u8 ems_pci_v1_read_reg(const struct sja1000_priv *priv, int port)134{135	return readb(priv->reg_base + (port * 4));136}137 138static void ems_pci_v1_write_reg(const struct sja1000_priv *priv,139				 int port, u8 val)140{141	writeb(val, priv->reg_base + (port * 4));142}143 144static void ems_pci_v1_post_irq(const struct sja1000_priv *priv)145{146	struct ems_pci_card *card = priv->priv;147 148	/* reset int flag of pita */149	writel(PITA2_ICR_INT0_EN | PITA2_ICR_INT0,150	       card->conf_addr + PITA2_ICR);151}152 153static u8 ems_pci_v2_read_reg(const struct sja1000_priv *priv, int port)154{155	return readb(priv->reg_base + port);156}157 158static void ems_pci_v2_write_reg(const struct sja1000_priv *priv,159				 int port, u8 val)160{161	writeb(val, priv->reg_base + port);162}163 164static void ems_pci_v2_post_irq(const struct sja1000_priv *priv)165{166	struct ems_pci_card *card = priv->priv;167 168	writel(PLX_ICSR_ENA_CLR, card->conf_addr + PLX_ICSR);169}170 171static u8 ems_pci_v3_read_reg(const struct sja1000_priv *priv, int port)172{173	return readb(priv->reg_base + port);174}175 176static void ems_pci_v3_write_reg(const struct sja1000_priv *priv,177				 int port, u8 val)178{179	writeb(val, priv->reg_base + port);180}181 182static void ems_pci_v3_post_irq(const struct sja1000_priv *priv)183{184	struct ems_pci_card *card = priv->priv;185 186	writel(ASIX_LINTSR_INT0AC, card->conf_addr + ASIX_LINTSR);187}188 189/* Check if a CAN controller is present at the specified location190 * by trying to set 'em into the PeliCAN mode191 */192static inline int ems_pci_check_chan(const struct sja1000_priv *priv)193{194	unsigned char res;195 196	/* Make sure SJA1000 is in reset mode */197	priv->write_reg(priv, SJA1000_MOD, 1);198 199	priv->write_reg(priv, SJA1000_CDR, CDR_PELICAN);200 201	/* read reset-values */202	res = priv->read_reg(priv, SJA1000_CDR);203 204	if (res == CDR_PELICAN)205		return 1;206 207	return 0;208}209 210static void ems_pci_del_card(struct pci_dev *pdev)211{212	struct ems_pci_card *card = pci_get_drvdata(pdev);213	struct net_device *dev;214	int i = 0;215 216	for (i = 0; i < card->channels; i++) {217		dev = card->net_dev[i];218 219		if (!dev)220			continue;221 222		dev_info(&pdev->dev, "Removing %s.\n", dev->name);223		unregister_sja1000dev(dev);224		free_sja1000dev(dev);225	}226 227	if (card->base_addr)228		pci_iounmap(card->pci_dev, card->base_addr);229 230	if (card->conf_addr)231		pci_iounmap(card->pci_dev, card->conf_addr);232 233	kfree(card);234 235	pci_disable_device(pdev);236}237 238static void ems_pci_card_reset(struct ems_pci_card *card)239{240	/* Request board reset */241	writeb(0, card->base_addr);242}243 244/* Probe PCI device for EMS CAN signature and register each available245 * CAN channel to SJA1000 Socket-CAN subsystem.246 */247static int ems_pci_add_card(struct pci_dev *pdev,248			    const struct pci_device_id *ent)249{250	struct sja1000_priv *priv;251	struct net_device *dev;252	struct ems_pci_card *card;253	int max_chan, conf_size, base_bar, conf_bar;254	int err, i;255 256	/* Enabling PCI device */257	if (pci_enable_device(pdev) < 0) {258		dev_err(&pdev->dev, "Enabling PCI device failed\n");259		return -ENODEV;260	}261 262	/* Allocating card structures to hold addresses, ... */263	card = kzalloc(sizeof(*card), GFP_KERNEL);264	if (!card) {265		pci_disable_device(pdev);266		return -ENOMEM;267	}268 269	pci_set_drvdata(pdev, card);270 271	card->pci_dev = pdev;272 273	card->channels = 0;274 275	if (pdev->vendor == PCI_VENDOR_ID_ASIX) {276		card->version = 3; /* CPC-PCI v3 */277		max_chan = EMS_PCI_V3_MAX_CHAN;278		base_bar = EMS_PCI_V3_BASE_BAR;279		conf_bar = EMS_PCI_V3_CONF_BAR;280		conf_size = EMS_PCI_V3_CONF_SIZE;281	} else if (pdev->vendor == PCI_VENDOR_ID_PLX) {282		card->version = 2; /* CPC-PCI v2 */283		max_chan = EMS_PCI_V2_MAX_CHAN;284		base_bar = EMS_PCI_V2_BASE_BAR;285		conf_bar = EMS_PCI_V2_CONF_BAR;286		conf_size = EMS_PCI_V2_CONF_SIZE;287	} else {288		card->version = 1; /* CPC-PCI v1 */289		max_chan = EMS_PCI_V1_MAX_CHAN;290		base_bar = EMS_PCI_V1_BASE_BAR;291		conf_bar = EMS_PCI_V1_CONF_BAR;292		conf_size = EMS_PCI_V1_CONF_SIZE;293	}294 295	/* Remap configuration space and controller memory area */296	card->conf_addr = pci_iomap(pdev, conf_bar, conf_size);297	if (!card->conf_addr) {298		err = -ENOMEM;299		goto failure_cleanup;300	}301 302	card->base_addr = pci_iomap(pdev, base_bar, EMS_PCI_BASE_SIZE);303	if (!card->base_addr) {304		err = -ENOMEM;305		goto failure_cleanup;306	}307 308	if (card->version == 1) {309		/* Configure PITA-2 parallel interface (enable MUX) */310		writel(PITA2_MISC_CONFIG, card->conf_addr + PITA2_MISC);311 312		/* Check for unique EMS CAN signature */313		if (ems_pci_v1_readb(card, 0) != 0x55 ||314		    ems_pci_v1_readb(card, 1) != 0xAA ||315		    ems_pci_v1_readb(card, 2) != 0x01 ||316		    ems_pci_v1_readb(card, 3) != 0xCB ||317		    ems_pci_v1_readb(card, 4) != 0x11) {318			dev_err(&pdev->dev,319				"Not EMS Dr. Thomas Wuensche interface\n");320			err = -ENODEV;321			goto failure_cleanup;322		}323	}324 325	if (card->version == 3) {326		/* ASIX chip asserts local reset to CAN controllers327		 * after bootup until it is deasserted328		 */329		writel(readl(card->conf_addr + ASIX_LIEMR) & ~ASIX_LIEMR_LRST,330		       card->conf_addr + ASIX_LIEMR);331	}332 333	ems_pci_card_reset(card);334 335	/* Detect available channels */336	for (i = 0; i < max_chan; i++) {337		dev = alloc_sja1000dev(0);338		if (!dev) {339			err = -ENOMEM;340			goto failure_cleanup;341		}342 343		card->net_dev[i] = dev;344		priv = netdev_priv(dev);345		priv->priv = card;346		priv->irq_flags = IRQF_SHARED;347 348		dev->irq = pdev->irq;349 350		if (card->version == 1) {351			priv->read_reg  = ems_pci_v1_read_reg;352			priv->write_reg = ems_pci_v1_write_reg;353			priv->post_irq  = ems_pci_v1_post_irq;354			priv->reg_base = card->base_addr + EMS_PCI_V1_CAN_BASE_OFFSET355					+ (i * EMS_PCI_V1_CAN_CTRL_SIZE);356		} else if (card->version == 2) {357			priv->read_reg  = ems_pci_v2_read_reg;358			priv->write_reg = ems_pci_v2_write_reg;359			priv->post_irq  = ems_pci_v2_post_irq;360			priv->reg_base = card->base_addr + EMS_PCI_V2_CAN_BASE_OFFSET361					+ (i * EMS_PCI_V2_CAN_CTRL_SIZE);362		} else {363			priv->read_reg  = ems_pci_v3_read_reg;364			priv->write_reg = ems_pci_v3_write_reg;365			priv->post_irq  = ems_pci_v3_post_irq;366			priv->reg_base = card->base_addr + EMS_PCI_V3_CAN_BASE_OFFSET367					+ (i * EMS_PCI_V3_CAN_CTRL_SIZE);368		}369 370		/* Check if channel is present */371		if (ems_pci_check_chan(priv)) {372			priv->can.clock.freq = EMS_PCI_CAN_CLOCK;373			priv->ocr = EMS_PCI_OCR;374			priv->cdr = EMS_PCI_CDR;375 376			SET_NETDEV_DEV(dev, &pdev->dev);377			dev->dev_id = i;378 379			if (card->version == 1) {380				/* reset int flag of pita */381				writel(PITA2_ICR_INT0_EN | PITA2_ICR_INT0,382				       card->conf_addr + PITA2_ICR);383			} else if (card->version == 2) {384				/* enable IRQ in PLX 9030 */385				writel(PLX_ICSR_ENA_CLR,386				       card->conf_addr + PLX_ICSR);387			} else {388				/* Enable IRQ in AX99100 */389				writel(ASIX_LINTSR_INT0AC, card->conf_addr + ASIX_LINTSR);390				/* Enable local INT0 input enable */391				writel(readl(card->conf_addr + ASIX_LIEMR) | ASIX_LIEMR_L0EINTEN,392				       card->conf_addr + ASIX_LIEMR);393			}394 395			/* Register SJA1000 device */396			err = register_sja1000dev(dev);397			if (err) {398				dev_err(&pdev->dev,399					"Registering device failed: %pe\n",400					ERR_PTR(err));401				free_sja1000dev(dev);402				goto failure_cleanup;403			}404 405			card->channels++;406 407			dev_info(&pdev->dev, "Channel #%d at 0x%p, irq %d\n",408				 i + 1, priv->reg_base, dev->irq);409		} else {410			free_sja1000dev(dev);411		}412	}413 414	return 0;415 416failure_cleanup:417	dev_err(&pdev->dev, "Error: %d. Cleaning Up.\n", err);418 419	ems_pci_del_card(pdev);420 421	return err;422}423 424static struct pci_driver ems_pci_driver = {425	.name = DRV_NAME,426	.id_table = ems_pci_tbl,427	.probe = ems_pci_add_card,428	.remove = ems_pci_del_card,429};430 431module_pci_driver(ems_pci_driver);432