| Message ID | 20190117200601.16416-1-dmurphy@ti.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v4,1/4] can: m_can: Create a m_can platform framework | expand |
Wolfgang On 1/17/19 2:05 PM, Dan Murphy wrote: > Create a m_can platform framework that peripherial > devices can register to and use common code and register sets. > The peripherial devices may provide read/write and configuration > support of the IP. > > Signed-off-by: Dan Murphy <dmurphy@ti.com> > --- > drivers/net/can/m_can/m_can.c | 6 + > drivers/net/can/m_can/m_can_platform.c | 209 +++++++++++++++++++++++++ > drivers/net/can/m_can/m_can_platform.h | 163 +++++++++++++++++++ > 3 files changed, 378 insertions(+) > create mode 100644 drivers/net/can/m_can/m_can_platform.c > create mode 100644 drivers/net/can/m_can/m_can_platform.h > > diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c > index 9b449400376b..f817b28582e9 100644 > --- a/drivers/net/can/m_can/m_can.c > +++ b/drivers/net/can/m_can/m_can.c > @@ -414,6 +414,9 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv, > u32 timeout = 10; > u32 val = 0; > > + if (cccr & CCCR_CSR) > + cccr &= ~CCCR_CSR; > + > if (enable) { > /* enable m_can configuration */ > m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT); > @@ -1155,6 +1158,9 @@ static void m_can_chip_config(struct net_device *dev) > m_can_set_bittiming(dev); > > m_can_config_endisable(priv, false); > + > + if (priv->device_init) > + priv->device_init(priv); > } > > static void m_can_start(struct net_device *dev) > diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c > new file mode 100644 > index 000000000000..03172911323a > --- /dev/null > +++ b/drivers/net/can/m_can/m_can_platform.c > @@ -0,0 +1,209 @@ > +/* > + * CAN bus driver for Bosch M_CAN controller > + * > + * Copyright (C) 2014 Freescale Semiconductor, Inc. > + * Dong Aisheng <b29396@freescale.com> > + * > + * Bosch M_CAN user manual can be obtained from: > + * http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/ > + * mcan_users_manual_v302.pdf > + * > + * This file is licensed under the terms of the GNU General Public > + * License version 2. This program is licensed "as is" without any > + * warranty of any kind, whether express or implied. > + */ > + > +#include <linux/clk.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/netdevice.h> > +#include <linux/platform_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/can/dev.h> > +#include <linux/pinctrl/consumer.h> > + > +#include "m_can_platform.h" > + > +struct m_can_plat_priv { > + void __iomem *base; > + void __iomem *mram_base; > +}; > + > +static u32 iomap_read_reg(struct m_can_classdev *m_can_class, int reg) > +{ > + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; > + > + return readl(priv->base + reg); > +} > + > +static u32 iomap_read_fifo(struct m_can_classdev *m_can_class, int addr_offset) > +{ > + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; > + > + return readl(priv->mram_base + addr_offset); > +} > + > +static int iomap_write_reg(struct m_can_classdev *m_can_class, int reg, int val) > +{ > + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; > + > + writel(val, priv->base + reg); > + > + return 0; > +} > + > +static int iomap_write_fifo(struct m_can_classdev *m_can_class, int addr_offset, int val) > +{ > + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; > + > + writel(val, priv->base + addr_offset); > + > + return 0; > +} > + > +static int m_can_plat_probe(struct platform_device *pdev) > +{ > + struct m_can_classdev *mcan_class; > + struct m_can_plat_priv *priv; > + struct resource *res; > + void __iomem *addr; > + void __iomem *mram_addr; > + int irq, ret = 0; > + > + mcan_class = m_can_core_allocate_dev(&pdev->dev); > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + mcan_class->device_data = priv; > + > + m_can_core_get_clocks(mcan_class); > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can"); > + addr = devm_ioremap_resource(&pdev->dev, res); > + irq = platform_get_irq_byname(pdev, "int0"); > + if (IS_ERR(addr) || irq < 0) { > + ret = -EINVAL; > + goto failed_ret; > + } > + > + /* message ram could be shared */ > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); > + if (!res) { > + ret = -ENODEV; > + goto failed_ret; > + } > + > + mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res)); > + if (!mram_addr) { > + ret = -ENOMEM; > + goto failed_ret; > + } > + > + priv->base = addr; > + priv->mram_base = mram_addr; > + > + mcan_class->net->irq = irq; > + mcan_class->pm_clock_support = 1; > + mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk); > + mcan_class->dev = &pdev->dev; > + > + mcan_class->read_reg = &iomap_read_reg; > + mcan_class->write_reg = &iomap_write_reg; > + mcan_class->write_fifo = &iomap_write_fifo; > + mcan_class->read_fifo = &iomap_read_fifo; > + mcan_class->is_peripherial = false; > + > + platform_set_drvdata(pdev, mcan_class->dev); > + > + m_can_init_ram(mcan_class); > + > + ret = m_can_core_register(mcan_class); > + > +failed_ret: > + return ret; > +} > + > +static __maybe_unused int m_can_suspend(struct device *dev) > +{ > + return m_can_core_suspend(dev); > +} > + > +static __maybe_unused int m_can_resume(struct device *dev) > +{ > + return m_can_core_resume(dev); > +} > + > +static int m_can_plat_remove(struct platform_device *pdev) > +{ > + struct net_device *dev = platform_get_drvdata(pdev); > + struct m_can_classdev *mcan_class = netdev_priv(dev); > + > + m_can_core_unregister(mcan_class); > + > + platform_set_drvdata(pdev, NULL); > + > + return 0; > +} > + > +static int __maybe_unused m_can_runtime_suspend(struct device *dev) > +{ > + struct net_device *ndev = dev_get_drvdata(dev); > + struct m_can_classdev *mcan_class = netdev_priv(ndev); > + > + m_can_core_suspend(dev); > + > + clk_disable_unprepare(mcan_class->cclk); > + clk_disable_unprepare(mcan_class->hclk); > + > + return 0; > +} > + > +static int __maybe_unused m_can_runtime_resume(struct device *dev) > +{ > + struct net_device *ndev = dev_get_drvdata(dev); > + struct m_can_classdev *mcan_class = netdev_priv(ndev); > + int err; > + > + err = clk_prepare_enable(mcan_class->hclk); > + if (err) > + return err; > + > + err = clk_prepare_enable(mcan_class->cclk); > + if (err) > + clk_disable_unprepare(mcan_class->hclk); > + > + m_can_core_resume(dev); > + > + return err; > +} > + > +static const struct dev_pm_ops m_can_pmops = { > + SET_RUNTIME_PM_OPS(m_can_runtime_suspend, > + m_can_runtime_resume, NULL) > + SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume) > +}; > + > +static const struct of_device_id m_can_of_table[] = { > + { .compatible = "bosch,m_can", .data = NULL }, > + { /* sentinel */ }, > +}; > +MODULE_DEVICE_TABLE(of, m_can_of_table); > + > +static struct platform_driver m_can_plat_driver = { > + .driver = { > + .name = KBUILD_MODNAME, > + .of_match_table = m_can_of_table, > + .pm = &m_can_pmops, > + }, > + .probe = m_can_plat_probe, > + .remove = m_can_plat_remove, > +}; > + > +module_platform_driver(m_can_plat_driver); > + > +MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>"); > +MODULE_LICENSE("GPL v2"); > +MODULE_DESCRIPTION("CAN bus driver for Bosch M_CAN controller"); > diff --git a/drivers/net/can/m_can/m_can_platform.h b/drivers/net/can/m_can/m_can_platform.h > new file mode 100644 > index 000000000000..97e90dd79613 > --- /dev/null > +++ b/drivers/net/can/m_can/m_can_platform.h > @@ -0,0 +1,163 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ > + > +#ifndef _CAN_M_CAN_CORE_H_ > +#define _CAN_M_CAN_CORE_H_ > + > +#include <linux/can/core.h> > +#include <linux/can/led.h> > +#include <linux/completion.h> > +#include <linux/device.h> > +#include <linux/dma-mapping.h> > +#include <linux/freezer.h> > +#include <linux/slab.h> > +#include <linux/uaccess.h> > +#include <linux/clk.h> > +#include <linux/delay.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/netdevice.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/iopoll.h> > +#include <linux/can/dev.h> > +#include <linux/pinctrl/consumer.h> > + > +/* m_can lec values */ > +enum m_can_lec_type { > + LEC_NO_ERROR = 0, > + LEC_STUFF_ERROR, > + LEC_FORM_ERROR, > + LEC_ACK_ERROR, > + LEC_BIT1_ERROR, > + LEC_BIT0_ERROR, > + LEC_CRC_ERROR, > + LEC_UNUSED, > +}; > + > +enum m_can_mram_cfg { > + MRAM_SIDF = 0, > + MRAM_XIDF, > + MRAM_RXF0, > + MRAM_RXF1, > + MRAM_RXB, > + MRAM_TXE, > + MRAM_TXB, > + MRAM_CFG_NUM, > +}; > + > +/* registers definition */ > +enum m_can_reg { > + M_CAN_CREL = 0x0, > + M_CAN_ENDN = 0x4, > + M_CAN_CUST = 0x8, > + M_CAN_DBTP = 0xc, > + M_CAN_TEST = 0x10, > + M_CAN_RWD = 0x14, > + M_CAN_CCCR = 0x18, > + M_CAN_NBTP = 0x1c, > + M_CAN_TSCC = 0x20, > + M_CAN_TSCV = 0x24, > + M_CAN_TOCC = 0x28, > + M_CAN_TOCV = 0x2c, > + M_CAN_ECR = 0x40, > + M_CAN_PSR = 0x44, > +/* TDCR Register only available for version >=3.1.x */ > + M_CAN_TDCR = 0x48, > + M_CAN_IR = 0x50, > + M_CAN_IE = 0x54, > + M_CAN_ILS = 0x58, > + M_CAN_ILE = 0x5c, > + M_CAN_GFC = 0x80, > + M_CAN_SIDFC = 0x84, > + M_CAN_XIDFC = 0x88, > + M_CAN_XIDAM = 0x90, > + M_CAN_HPMS = 0x94, > + M_CAN_NDAT1 = 0x98, > + M_CAN_NDAT2 = 0x9c, > + M_CAN_RXF0C = 0xa0, > + M_CAN_RXF0S = 0xa4, > + M_CAN_RXF0A = 0xa8, > + M_CAN_RXBC = 0xac, > + M_CAN_RXF1C = 0xb0, > + M_CAN_RXF1S = 0xb4, > + M_CAN_RXF1A = 0xb8, > + M_CAN_RXESC = 0xbc, > + M_CAN_TXBC = 0xc0, > + M_CAN_TXFQS = 0xc4, > + M_CAN_TXESC = 0xc8, > + M_CAN_TXBRP = 0xcc, > + M_CAN_TXBAR = 0xd0, > + M_CAN_TXBCR = 0xd4, > + M_CAN_TXBTO = 0xd8, > + M_CAN_TXBCF = 0xdc, > + M_CAN_TXBTIE = 0xe0, > + M_CAN_TXBCIE = 0xe4, > + M_CAN_TXEFC = 0xf0, > + M_CAN_TXEFS = 0xf4, > + M_CAN_TXEFA = 0xf8, > +}; > + > +/* address offset and element number for each FIFO/Buffer in the Message RAM */ > +struct mram_cfg { > + u16 off; > + u8 num; > +}; > + > +struct m_can_classdev; > + > +typedef int (*can_dev_init) (struct m_can_classdev *m_can_class); > +typedef int (*can_clr_dev_interrupts) (struct m_can_classdev *m_can_class); > +typedef u32 (*can_reg_read) (struct m_can_classdev *m_can_class, int reg); > +typedef int (*can_reg_write) (struct m_can_classdev *m_can_class, int reg, int val); > +typedef u32 (*can_fifo_read) (struct m_can_classdev *m_can_class, int addr_offset); > +typedef int (*can_fifo_write) (struct m_can_classdev *m_can_class, int addr_offset, int val); > + > +struct m_can_classdev { > + struct can_priv can; > + struct napi_struct napi; > + struct net_device *net; > + struct device *dev; > + struct clk *hclk; > + struct clk *cclk; > + > + struct workqueue_struct *wq; > + struct work_struct tx_work; > + struct sk_buff *skb; > + > + struct can_bittiming_const *bit_timing; > + struct can_bittiming_const *data_timing; > + > + void *device_data; > + > + /* Device specific call backs */ > + can_dev_init device_init; > + can_clr_dev_interrupts clr_dev_interrupts; > + can_reg_read read_reg; > + can_reg_write write_reg; > + can_fifo_read read_fifo; > + can_fifo_write write_fifo; > + > + int version; > + int freq; > + u32 irqstatus; > + > + int pm_clock_support; > + bool is_peripherial; > + > + struct mram_cfg mcfg[MRAM_CFG_NUM]; > +}; > + > +struct m_can_classdev *m_can_core_allocate_dev(struct device *dev); > +int m_can_core_register(struct m_can_classdev *m_can_dev); > +void m_can_core_unregister(struct m_can_classdev *m_can_dev); > +int m_can_core_get_clocks(struct m_can_classdev *m_can_dev); > +void m_can_init_ram(struct m_can_classdev *priv); > +void m_can_config_endisable(const struct m_can_classdev *priv, bool enable); > + > +int m_can_core_suspend(struct device *dev); > +int m_can_core_resume(struct device *dev); > +#endif /* _CAN_M_CAN_CORE_H_ */ > This patch set is working for the TCAN and at least boots on io-mapped devices. We have a couple of customers who are looking at using this implementation and we would like to start moving this patch set along in the review. I did not put a change log in here as there have been no comments for the last 3 patch sets I sent. This v4 squashes a few bugs I found during testing across all the files. Dan -- ------------------ Dan Murphy
Hello Dan, Am 17.01.19 um 21:08 schrieb Dan Murphy: > Wolfgang > > On 1/17/19 2:05 PM, Dan Murphy wrote: >> Create a m_can platform framework that peripherial >> devices can register to and use common code and register sets. >> The peripherial devices may provide read/write and configuration >> support of the IP. >> >> Signed-off-by: Dan Murphy <dmurphy@ti.com> >> --- >> drivers/net/can/m_can/m_can.c | 6 + >> drivers/net/can/m_can/m_can_platform.c | 209 +++++++++++++++++++++++++ >> drivers/net/can/m_can/m_can_platform.h | 163 +++++++++++++++++++ >> 3 files changed, 378 insertions(+) >> create mode 100644 drivers/net/can/m_can/m_can_platform.c >> create mode 100644 drivers/net/can/m_can/m_can_platform.h >> ... snip ... > This patch set is working for the TCAN and at least boots on io-mapped devices. > We have a couple of customers who are looking at using this implementation and we would like to > start moving this patch set along in the review. > > I did not put a change log in here as there have been no comments for the last 3 patch sets I sent. > > This v4 squashes a few bugs I found during testing across all the files. OK, after a very busy week I will try to find time for the review... finally. Thanks, Wolfgang.
Wolfgang On 1/18/19 12:56 AM, Wolfgang Grandegger wrote: > Hello Dan, > > Am 17.01.19 um 21:08 schrieb Dan Murphy: >> Wolfgang >> >> On 1/17/19 2:05 PM, Dan Murphy wrote: >>> Create a m_can platform framework that peripherial >>> devices can register to and use common code and register sets. >>> The peripherial devices may provide read/write and configuration >>> support of the IP. >>> >>> Signed-off-by: Dan Murphy <dmurphy@ti.com> >>> --- >>> drivers/net/can/m_can/m_can.c | 6 + >>> drivers/net/can/m_can/m_can_platform.c | 209 +++++++++++++++++++++++++ >>> drivers/net/can/m_can/m_can_platform.h | 163 +++++++++++++++++++ >>> 3 files changed, 378 insertions(+) >>> create mode 100644 drivers/net/can/m_can/m_can_platform.c >>> create mode 100644 drivers/net/can/m_can/m_can_platform.h >>> > > ... snip ... > >> This patch set is working for the TCAN and at least boots on io-mapped devices. >> We have a couple of customers who are looking at using this implementation and we would like to >> start moving this patch set along in the review. >> >> I did not put a change log in here as there have been no comments for the last 3 patch sets I sent. >> >> This v4 squashes a few bugs I found during testing across all the files. > > OK, after a very busy week I will try to find time for the review... > finally. > Thanks. I anticipate a v5 as we debug the io mapped code and continue to test the TCAN code. Dan > Thanks, > > Wolfgang. > -- ------------------ Dan Murphy
Hello Dan, looks already quite good... Am 17.01.19 um 21:05 schrieb Dan Murphy: > Create a m_can platform framework that peripherial > devices can register to and use common code and register sets. > The peripherial devices may provide read/write and configuration > support of the IP. > > Signed-off-by: Dan Murphy <dmurphy@ti.com> > --- > drivers/net/can/m_can/m_can.c | 6 + > drivers/net/can/m_can/m_can_platform.c | 209 +++++++++++++++++++++++++ > drivers/net/can/m_can/m_can_platform.h | 163 +++++++++++++++++++ > 3 files changed, 378 insertions(+) > create mode 100644 drivers/net/can/m_can/m_can_platform.c > create mode 100644 drivers/net/can/m_can/m_can_platform.h > > diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c > index 9b449400376b..f817b28582e9 100644 > --- a/drivers/net/can/m_can/m_can.c > +++ b/drivers/net/can/m_can/m_can.c > @@ -414,6 +414,9 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv, > u32 timeout = 10; > u32 val = 0; > > + if (cccr & CCCR_CSR) > + cccr &= ~CCCR_CSR; > + This is an unrelated change/fix. Should go somewhere else. > if (enable) { > /* enable m_can configuration */ > m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT); > @@ -1155,6 +1158,9 @@ static void m_can_chip_config(struct net_device *dev) > m_can_set_bittiming(dev); > > m_can_config_endisable(priv, false); > + > + if (priv->device_init) > + priv->device_init(priv); > } > > static void m_can_start(struct net_device *dev) > diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c > new file mode 100644 > index 000000000000..03172911323a > --- /dev/null > +++ b/drivers/net/can/m_can/m_can_platform.c > @@ -0,0 +1,209 @@ > +/* > + * CAN bus driver for Bosch M_CAN controller > + * > + * Copyright (C) 2014 Freescale Semiconductor, Inc. > + * Dong Aisheng <b29396@freescale.com> > + * > + * Bosch M_CAN user manual can be obtained from: > + * http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/ > + * mcan_users_manual_v302.pdf > + * > + * This file is licensed under the terms of the GNU General Public > + * License version 2. This program is licensed "as is" without any > + * warranty of any kind, whether express or implied. > + */ > + > +#include <linux/clk.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/netdevice.h> > +#include <linux/platform_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/can/dev.h> > +#include <linux/pinctrl/consumer.h> > + > +#include "m_can_platform.h" > + > +struct m_can_plat_priv { > + void __iomem *base; > + void __iomem *mram_base; > +}; > + > +static u32 iomap_read_reg(struct m_can_classdev *m_can_class, int reg) > +{ > + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; > + > + return readl(priv->base + reg); > +} > + > +static u32 iomap_read_fifo(struct m_can_classdev *m_can_class, int addr_offset) Why not just "offset". > +{ > + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; > + > + return readl(priv->mram_base + addr_offset); > +} > + > +static int iomap_write_reg(struct m_can_classdev *m_can_class, int reg, int val) > +{ > + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; > + > + writel(val, priv->base + reg); > + > + return 0; > +} > + > +static int iomap_write_fifo(struct m_can_classdev *m_can_class, int addr_offset, int val) > +{ > + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; > + > + writel(val, priv->base + addr_offset); > + > + return 0; > +} > + > +static int m_can_plat_probe(struct platform_device *pdev) > +{ > + struct m_can_classdev *mcan_class; > + struct m_can_plat_priv *priv; > + struct resource *res; > + void __iomem *addr; > + void __iomem *mram_addr; > + int irq, ret = 0; > + > + mcan_class = m_can_core_allocate_dev(&pdev->dev); > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + mcan_class->device_data = priv; > + > + m_can_core_get_clocks(mcan_class); > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can"); > + addr = devm_ioremap_resource(&pdev->dev, res); > + irq = platform_get_irq_byname(pdev, "int0"); > + if (IS_ERR(addr) || irq < 0) { > + ret = -EINVAL; > + goto failed_ret; > + } > + > + /* message ram could be shared */ > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); > + if (!res) { > + ret = -ENODEV; > + goto failed_ret; > + } > + > + mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res)); > + if (!mram_addr) { > + ret = -ENOMEM; > + goto failed_ret; > + } > + > + priv->base = addr; > + priv->mram_base = mram_addr; > + > + mcan_class->net->irq = irq; > + mcan_class->pm_clock_support = 1; > + mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk); > + mcan_class->dev = &pdev->dev; > + > + mcan_class->read_reg = &iomap_read_reg; > + mcan_class->write_reg = &iomap_write_reg; > + mcan_class->write_fifo = &iomap_write_fifo; > + mcan_class->read_fifo = &iomap_read_fifo; No "&" please! > + mcan_class->is_peripherial = false; > + > + platform_set_drvdata(pdev, mcan_class->dev); > + > + m_can_init_ram(mcan_class); > + > + ret = m_can_core_register(mcan_class); > + > +failed_ret: > + return ret; > +} > + > +static __maybe_unused int m_can_suspend(struct device *dev) > +{ > + return m_can_core_suspend(dev); > +} > + > +static __maybe_unused int m_can_resume(struct device *dev) > +{ > + return m_can_core_resume(dev); > +} > + > +static int m_can_plat_remove(struct platform_device *pdev) > +{ > + struct net_device *dev = platform_get_drvdata(pdev); > + struct m_can_classdev *mcan_class = netdev_priv(dev); > + > + m_can_core_unregister(mcan_class); > + > + platform_set_drvdata(pdev, NULL); > + > + return 0; > +} > + > +static int __maybe_unused m_can_runtime_suspend(struct device *dev) > +{ > + struct net_device *ndev = dev_get_drvdata(dev); > + struct m_can_classdev *mcan_class = netdev_priv(ndev); > + > + m_can_core_suspend(dev); > + > + clk_disable_unprepare(mcan_class->cclk); > + clk_disable_unprepare(mcan_class->hclk); > + > + return 0; > +} > + > +static int __maybe_unused m_can_runtime_resume(struct device *dev) > +{ > + struct net_device *ndev = dev_get_drvdata(dev); > + struct m_can_classdev *mcan_class = netdev_priv(ndev); > + int err; > + > + err = clk_prepare_enable(mcan_class->hclk); > + if (err) > + return err; > + > + err = clk_prepare_enable(mcan_class->cclk); > + if (err) > + clk_disable_unprepare(mcan_class->hclk); > + > + m_can_core_resume(dev); > + > + return err; > +} > + > +static const struct dev_pm_ops m_can_pmops = { > + SET_RUNTIME_PM_OPS(m_can_runtime_suspend, > + m_can_runtime_resume, NULL) > + SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume) > +}; > + > +static const struct of_device_id m_can_of_table[] = { > + { .compatible = "bosch,m_can", .data = NULL }, > + { /* sentinel */ }, > +}; > +MODULE_DEVICE_TABLE(of, m_can_of_table); > + > +static struct platform_driver m_can_plat_driver = { > + .driver = { > + .name = KBUILD_MODNAME, > + .of_match_table = m_can_of_table, > + .pm = &m_can_pmops, > + }, > + .probe = m_can_plat_probe, > + .remove = m_can_plat_remove, > +}; > + > +module_platform_driver(m_can_plat_driver); > + > +MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>"); Feel free to add yourself as second author. > +MODULE_LICENSE("GPL v2"); > +MODULE_DESCRIPTION("CAN bus driver for Bosch M_CAN controller"); > diff --git a/drivers/net/can/m_can/m_can_platform.h b/drivers/net/can/m_can/m_can_platform.h > new file mode 100644 > index 000000000000..97e90dd79613 > --- /dev/null > +++ b/drivers/net/can/m_can/m_can_platform.h These are common definitions, right? Therefore the filen name should be "m_can.h"!? > @@ -0,0 +1,163 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ > + > +#ifndef _CAN_M_CAN_CORE_H_ > +#define _CAN_M_CAN_CORE_H_ > + > +#include <linux/can/core.h> > +#include <linux/can/led.h> > +#include <linux/completion.h> > +#include <linux/device.h> > +#include <linux/dma-mapping.h> > +#include <linux/freezer.h> > +#include <linux/slab.h> > +#include <linux/uaccess.h> > +#include <linux/clk.h> > +#include <linux/delay.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/netdevice.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/iopoll.h> > +#include <linux/can/dev.h> > +#include <linux/pinctrl/consumer.h> Do you really need them all in this header file? > + > +/* m_can lec values */ > +enum m_can_lec_type { > + LEC_NO_ERROR = 0, > + LEC_STUFF_ERROR, > + LEC_FORM_ERROR, > + LEC_ACK_ERROR, > + LEC_BIT1_ERROR, > + LEC_BIT0_ERROR, > + LEC_CRC_ERROR, > + LEC_UNUSED, > +}; > + > +enum m_can_mram_cfg { > + MRAM_SIDF = 0, > + MRAM_XIDF, > + MRAM_RXF0, > + MRAM_RXF1, > + MRAM_RXB, > + MRAM_TXE, > + MRAM_TXB, > + MRAM_CFG_NUM, > +}; > + > +/* registers definition */ > +enum m_can_reg { > + M_CAN_CREL = 0x0, > + M_CAN_ENDN = 0x4, > + M_CAN_CUST = 0x8, > + M_CAN_DBTP = 0xc, > + M_CAN_TEST = 0x10, > + M_CAN_RWD = 0x14, > + M_CAN_CCCR = 0x18, > + M_CAN_NBTP = 0x1c, > + M_CAN_TSCC = 0x20, > + M_CAN_TSCV = 0x24, > + M_CAN_TOCC = 0x28, > + M_CAN_TOCV = 0x2c, > + M_CAN_ECR = 0x40, > + M_CAN_PSR = 0x44, > +/* TDCR Register only available for version >=3.1.x */ > + M_CAN_TDCR = 0x48, > + M_CAN_IR = 0x50, > + M_CAN_IE = 0x54, > + M_CAN_ILS = 0x58, > + M_CAN_ILE = 0x5c, > + M_CAN_GFC = 0x80, > + M_CAN_SIDFC = 0x84, > + M_CAN_XIDFC = 0x88, > + M_CAN_XIDAM = 0x90, > + M_CAN_HPMS = 0x94, > + M_CAN_NDAT1 = 0x98, > + M_CAN_NDAT2 = 0x9c, > + M_CAN_RXF0C = 0xa0, > + M_CAN_RXF0S = 0xa4, > + M_CAN_RXF0A = 0xa8, > + M_CAN_RXBC = 0xac, > + M_CAN_RXF1C = 0xb0, > + M_CAN_RXF1S = 0xb4, > + M_CAN_RXF1A = 0xb8, > + M_CAN_RXESC = 0xbc, > + M_CAN_TXBC = 0xc0, > + M_CAN_TXFQS = 0xc4, > + M_CAN_TXESC = 0xc8, > + M_CAN_TXBRP = 0xcc, > + M_CAN_TXBAR = 0xd0, > + M_CAN_TXBCR = 0xd4, > + M_CAN_TXBTO = 0xd8, > + M_CAN_TXBCF = 0xdc, > + M_CAN_TXBTIE = 0xe0, > + M_CAN_TXBCIE = 0xe4, > + M_CAN_TXEFC = 0xf0, > + M_CAN_TXEFS = 0xf4, > + M_CAN_TXEFA = 0xf8, > +}; > + > +/* address offset and element number for each FIFO/Buffer in the Message RAM */ > +struct mram_cfg { > + u16 off; > + u8 num; > +}; > + > +struct m_can_classdev; > + > +typedef int (*can_dev_init) (struct m_can_classdev *m_can_class); > +typedef int (*can_clr_dev_interrupts) (struct m_can_classdev *m_can_class); > +typedef u32 (*can_reg_read) (struct m_can_classdev *m_can_class, int reg); > +typedef int (*can_reg_write) (struct m_can_classdev *m_can_class, int reg, int val); > +typedef u32 (*can_fifo_read) (struct m_can_classdev *m_can_class, int addr_offset); > +typedef int (*can_fifo_write) (struct m_can_classdev *m_can_class, int addr_offset, int val); No typedefs in the kernel, please! > +struct m_can_classdev { > + struct can_priv can; > + struct napi_struct napi; > + struct net_device *net; > + struct device *dev; > + struct clk *hclk; > + struct clk *cclk; > + > + struct workqueue_struct *wq; > + struct work_struct tx_work; > + struct sk_buff *skb; > + > + struct can_bittiming_const *bit_timing; > + struct can_bittiming_const *data_timing; > + > + void *device_data; > + > + /* Device specific call backs */ > + can_dev_init device_init; > + can_clr_dev_interrupts clr_dev_interrupts; > + can_reg_read read_reg; > + can_reg_write write_reg; > + can_fifo_read read_fifo; > + can_fifo_write write_fifo; > + > + int version; > + int freq; > + u32 irqstatus; > + > + int pm_clock_support; > + bool is_peripherial; > + > + struct mram_cfg mcfg[MRAM_CFG_NUM]; > +}; > + > +struct m_can_classdev *m_can_core_allocate_dev(struct device *dev); > +int m_can_core_register(struct m_can_classdev *m_can_dev); > +void m_can_core_unregister(struct m_can_classdev *m_can_dev); > +int m_can_core_get_clocks(struct m_can_classdev *m_can_dev); You use here three different prefixes: "m_can_core", "m_can_classdev" and "m_can_dev". There should be just one principle name for the struct, func, args and vars, e.g.: int m_can_device_register(struct m_can_device *mcan_dev); > +void m_can_init_ram(struct m_can_classdev *priv); > +void m_can_config_endisable(const struct m_can_classdev *priv, bool enable); > + > +int m_can_core_suspend(struct device *dev); > +int m_can_core_resume(struct device *dev); > +#endif /* _CAN_M_CAN_CORE_H_ */ > Wolfgang
Wolfgang Thanks for the review On 1/22/19 2:16 AM, Wolfgang Grandegger wrote: > Hello Dan, > > looks already quite good... > > Am 17.01.19 um 21:05 schrieb Dan Murphy: >> Create a m_can platform framework that peripherial >> devices can register to and use common code and register sets. >> The peripherial devices may provide read/write and configuration >> support of the IP. >> >> Signed-off-by: Dan Murphy <dmurphy@ti.com> >> --- >> drivers/net/can/m_can/m_can.c | 6 + >> drivers/net/can/m_can/m_can_platform.c | 209 +++++++++++++++++++++++++ >> drivers/net/can/m_can/m_can_platform.h | 163 +++++++++++++++++++ >> 3 files changed, 378 insertions(+) >> create mode 100644 drivers/net/can/m_can/m_can_platform.c >> create mode 100644 drivers/net/can/m_can/m_can_platform.h >> >> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c >> index 9b449400376b..f817b28582e9 100644 >> --- a/drivers/net/can/m_can/m_can.c >> +++ b/drivers/net/can/m_can/m_can.c >> @@ -414,6 +414,9 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv, >> u32 timeout = 10; >> u32 val = 0; >> >> + if (cccr & CCCR_CSR) >> + cccr &= ~CCCR_CSR; >> + > > This is an unrelated change/fix. Should go somewhere else. > I thought I pulled this and the change below out of of this patchset. >> if (enable) { >> /* enable m_can configuration */ >> m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT); >> @@ -1155,6 +1158,9 @@ static void m_can_chip_config(struct net_device *dev) >> m_can_set_bittiming(dev); >> >> m_can_config_endisable(priv, false); >> + >> + if (priv->device_init) >> + priv->device_init(priv); >> } >> >> static void m_can_start(struct net_device *dev) >> diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c >> new file mode 100644 >> index 000000000000..03172911323a >> --- /dev/null >> +++ b/drivers/net/can/m_can/m_can_platform.c >> @@ -0,0 +1,209 @@ >> +/* >> + * CAN bus driver for Bosch M_CAN controller >> + * >> + * Copyright (C) 2014 Freescale Semiconductor, Inc. >> + * Dong Aisheng <b29396@freescale.com> >> + * >> + * Bosch M_CAN user manual can be obtained from: >> + * http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/ >> + * mcan_users_manual_v302.pdf >> + * >> + * This file is licensed under the terms of the GNU General Public >> + * License version 2. This program is licensed "as is" without any >> + * warranty of any kind, whether express or implied. >> + */ >> + >> +#include <linux/clk.h> >> +#include <linux/interrupt.h> >> +#include <linux/io.h> >> +#include <linux/kernel.h> >> +#include <linux/module.h> >> +#include <linux/netdevice.h> >> +#include <linux/platform_device.h> >> +#include <linux/pm_runtime.h> >> +#include <linux/can/dev.h> >> +#include <linux/pinctrl/consumer.h> >> + >> +#include "m_can_platform.h" >> + >> +struct m_can_plat_priv { >> + void __iomem *base; >> + void __iomem *mram_base; >> +}; >> + >> +static u32 iomap_read_reg(struct m_can_classdev *m_can_class, int reg) >> +{ >> + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; >> + >> + return readl(priv->base + reg); >> +} >> + >> +static u32 iomap_read_fifo(struct m_can_classdev *m_can_class, int addr_offset) > > Why not just "offset". > I can change the name >> +{ >> + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; >> + >> + return readl(priv->mram_base + addr_offset); >> +} >> + >> +static int iomap_write_reg(struct m_can_classdev *m_can_class, int reg, int val) >> +{ >> + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; >> + >> + writel(val, priv->base + reg); >> + >> + return 0; >> +} >> + >> +static int iomap_write_fifo(struct m_can_classdev *m_can_class, int addr_offset, int val) >> +{ >> + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; >> + >> + writel(val, priv->base + addr_offset); >> + >> + return 0; >> +} >> + >> +static int m_can_plat_probe(struct platform_device *pdev) >> +{ >> + struct m_can_classdev *mcan_class; >> + struct m_can_plat_priv *priv; >> + struct resource *res; >> + void __iomem *addr; >> + void __iomem *mram_addr; >> + int irq, ret = 0; >> + >> + mcan_class = m_can_core_allocate_dev(&pdev->dev); >> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); >> + if (!priv) >> + return -ENOMEM; >> + >> + mcan_class->device_data = priv; >> + >> + m_can_core_get_clocks(mcan_class); >> + >> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can"); >> + addr = devm_ioremap_resource(&pdev->dev, res); >> + irq = platform_get_irq_byname(pdev, "int0"); >> + if (IS_ERR(addr) || irq < 0) { >> + ret = -EINVAL; >> + goto failed_ret; >> + } >> + >> + /* message ram could be shared */ >> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); >> + if (!res) { >> + ret = -ENODEV; >> + goto failed_ret; >> + } >> + >> + mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res)); >> + if (!mram_addr) { >> + ret = -ENOMEM; >> + goto failed_ret; >> + } >> + >> + priv->base = addr; >> + priv->mram_base = mram_addr; >> + >> + mcan_class->net->irq = irq; >> + mcan_class->pm_clock_support = 1; >> + mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk); >> + mcan_class->dev = &pdev->dev; >> + >> + mcan_class->read_reg = &iomap_read_reg; >> + mcan_class->write_reg = &iomap_write_reg; >> + mcan_class->write_fifo = &iomap_write_fifo; >> + mcan_class->read_fifo = &iomap_read_fifo; > > No "&" please! > OK. But can I ask why? >> + mcan_class->is_peripherial = false; >> + >> + platform_set_drvdata(pdev, mcan_class->dev); >> + >> + m_can_init_ram(mcan_class); >> + >> + ret = m_can_core_register(mcan_class); >> + >> +failed_ret: >> + return ret; >> +} >> + >> +static __maybe_unused int m_can_suspend(struct device *dev) >> +{ >> + return m_can_core_suspend(dev); >> +} >> + >> +static __maybe_unused int m_can_resume(struct device *dev) >> +{ >> + return m_can_core_resume(dev); >> +} >> + >> +static int m_can_plat_remove(struct platform_device *pdev) >> +{ >> + struct net_device *dev = platform_get_drvdata(pdev); >> + struct m_can_classdev *mcan_class = netdev_priv(dev); >> + >> + m_can_core_unregister(mcan_class); >> + >> + platform_set_drvdata(pdev, NULL); >> + >> + return 0; >> +} >> + >> +static int __maybe_unused m_can_runtime_suspend(struct device *dev) >> +{ >> + struct net_device *ndev = dev_get_drvdata(dev); >> + struct m_can_classdev *mcan_class = netdev_priv(ndev); >> + >> + m_can_core_suspend(dev); >> + >> + clk_disable_unprepare(mcan_class->cclk); >> + clk_disable_unprepare(mcan_class->hclk); >> + >> + return 0; >> +} >> + >> +static int __maybe_unused m_can_runtime_resume(struct device *dev) >> +{ >> + struct net_device *ndev = dev_get_drvdata(dev); >> + struct m_can_classdev *mcan_class = netdev_priv(ndev); >> + int err; >> + >> + err = clk_prepare_enable(mcan_class->hclk); >> + if (err) >> + return err; >> + >> + err = clk_prepare_enable(mcan_class->cclk); >> + if (err) >> + clk_disable_unprepare(mcan_class->hclk); >> + >> + m_can_core_resume(dev); >> + >> + return err; >> +} >> + >> +static const struct dev_pm_ops m_can_pmops = { >> + SET_RUNTIME_PM_OPS(m_can_runtime_suspend, >> + m_can_runtime_resume, NULL) >> + SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume) >> +}; >> + >> +static const struct of_device_id m_can_of_table[] = { >> + { .compatible = "bosch,m_can", .data = NULL }, >> + { /* sentinel */ }, >> +}; >> +MODULE_DEVICE_TABLE(of, m_can_of_table); >> + >> +static struct platform_driver m_can_plat_driver = { >> + .driver = { >> + .name = KBUILD_MODNAME, >> + .of_match_table = m_can_of_table, >> + .pm = &m_can_pmops, >> + }, >> + .probe = m_can_plat_probe, >> + .remove = m_can_plat_remove, >> +}; >> + >> +module_platform_driver(m_can_plat_driver); >> + >> +MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>"); > > Feel free to add yourself as second author. > >> +MODULE_LICENSE("GPL v2"); >> +MODULE_DESCRIPTION("CAN bus driver for Bosch M_CAN controller"); >> diff --git a/drivers/net/can/m_can/m_can_platform.h b/drivers/net/can/m_can/m_can_platform.h >> new file mode 100644 >> index 000000000000..97e90dd79613 >> --- /dev/null >> +++ b/drivers/net/can/m_can/m_can_platform.h > > These are common definitions, right? Therefore the filen name should be > "m_can.h"!? > Ah yes. My mistake common m_can definitions should be just m_can. >> @@ -0,0 +1,163 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ >> + >> +#ifndef _CAN_M_CAN_CORE_H_ >> +#define _CAN_M_CAN_CORE_H_ >> + >> +#include <linux/can/core.h> >> +#include <linux/can/led.h> >> +#include <linux/completion.h> >> +#include <linux/device.h> >> +#include <linux/dma-mapping.h> >> +#include <linux/freezer.h> >> +#include <linux/slab.h> >> +#include <linux/uaccess.h> >> +#include <linux/clk.h> >> +#include <linux/delay.h> >> +#include <linux/interrupt.h> >> +#include <linux/io.h> >> +#include <linux/kernel.h> >> +#include <linux/module.h> >> +#include <linux/netdevice.h> >> +#include <linux/of.h> >> +#include <linux/of_device.h> >> +#include <linux/pm_runtime.h> >> +#include <linux/iopoll.h> >> +#include <linux/can/dev.h> >> +#include <linux/pinctrl/consumer.h> > > Do you really need them all in this header file? > Probably not just a copy paste from the original m_can. I will go through them and keep the common headers. >> + >> +/* m_can lec values */ >> +enum m_can_lec_type { >> + LEC_NO_ERROR = 0, >> + LEC_STUFF_ERROR, >> + LEC_FORM_ERROR, >> + LEC_ACK_ERROR, >> + LEC_BIT1_ERROR, >> + LEC_BIT0_ERROR, >> + LEC_CRC_ERROR, >> + LEC_UNUSED, >> +}; >> + >> +enum m_can_mram_cfg { >> + MRAM_SIDF = 0, >> + MRAM_XIDF, >> + MRAM_RXF0, >> + MRAM_RXF1, >> + MRAM_RXB, >> + MRAM_TXE, >> + MRAM_TXB, >> + MRAM_CFG_NUM, >> +}; >> + >> +/* registers definition */ >> +enum m_can_reg { >> + M_CAN_CREL = 0x0, >> + M_CAN_ENDN = 0x4, >> + M_CAN_CUST = 0x8, >> + M_CAN_DBTP = 0xc, >> + M_CAN_TEST = 0x10, >> + M_CAN_RWD = 0x14, >> + M_CAN_CCCR = 0x18, >> + M_CAN_NBTP = 0x1c, >> + M_CAN_TSCC = 0x20, >> + M_CAN_TSCV = 0x24, >> + M_CAN_TOCC = 0x28, >> + M_CAN_TOCV = 0x2c, >> + M_CAN_ECR = 0x40, >> + M_CAN_PSR = 0x44, >> +/* TDCR Register only available for version >=3.1.x */ >> + M_CAN_TDCR = 0x48, >> + M_CAN_IR = 0x50, >> + M_CAN_IE = 0x54, >> + M_CAN_ILS = 0x58, >> + M_CAN_ILE = 0x5c, >> + M_CAN_GFC = 0x80, >> + M_CAN_SIDFC = 0x84, >> + M_CAN_XIDFC = 0x88, >> + M_CAN_XIDAM = 0x90, >> + M_CAN_HPMS = 0x94, >> + M_CAN_NDAT1 = 0x98, >> + M_CAN_NDAT2 = 0x9c, >> + M_CAN_RXF0C = 0xa0, >> + M_CAN_RXF0S = 0xa4, >> + M_CAN_RXF0A = 0xa8, >> + M_CAN_RXBC = 0xac, >> + M_CAN_RXF1C = 0xb0, >> + M_CAN_RXF1S = 0xb4, >> + M_CAN_RXF1A = 0xb8, >> + M_CAN_RXESC = 0xbc, >> + M_CAN_TXBC = 0xc0, >> + M_CAN_TXFQS = 0xc4, >> + M_CAN_TXESC = 0xc8, >> + M_CAN_TXBRP = 0xcc, >> + M_CAN_TXBAR = 0xd0, >> + M_CAN_TXBCR = 0xd4, >> + M_CAN_TXBTO = 0xd8, >> + M_CAN_TXBCF = 0xdc, >> + M_CAN_TXBTIE = 0xe0, >> + M_CAN_TXBCIE = 0xe4, >> + M_CAN_TXEFC = 0xf0, >> + M_CAN_TXEFS = 0xf4, >> + M_CAN_TXEFA = 0xf8, >> +}; >> + >> +/* address offset and element number for each FIFO/Buffer in the Message RAM */ >> +struct mram_cfg { >> + u16 off; >> + u8 num; >> +}; >> + >> +struct m_can_classdev; >> + >> +typedef int (*can_dev_init) (struct m_can_classdev *m_can_class); >> +typedef int (*can_clr_dev_interrupts) (struct m_can_classdev *m_can_class); >> +typedef u32 (*can_reg_read) (struct m_can_classdev *m_can_class, int reg); >> +typedef int (*can_reg_write) (struct m_can_classdev *m_can_class, int reg, int val); >> +typedef u32 (*can_fifo_read) (struct m_can_classdev *m_can_class, int addr_offset); >> +typedef int (*can_fifo_write) (struct m_can_classdev *m_can_class, int addr_offset, int val); > > No typedefs in the kernel, please! > OK. Just following some other conventions. I can remove >> +struct m_can_classdev { >> + struct can_priv can; >> + struct napi_struct napi; >> + struct net_device *net; >> + struct device *dev; >> + struct clk *hclk; >> + struct clk *cclk; >> + >> + struct workqueue_struct *wq; >> + struct work_struct tx_work; >> + struct sk_buff *skb; >> + >> + struct can_bittiming_const *bit_timing; >> + struct can_bittiming_const *data_timing; >> + >> + void *device_data; >> + >> + /* Device specific call backs */ >> + can_dev_init device_init; >> + can_clr_dev_interrupts clr_dev_interrupts; >> + can_reg_read read_reg; >> + can_reg_write write_reg; >> + can_fifo_read read_fifo; >> + can_fifo_write write_fifo; >> + >> + int version; >> + int freq; >> + u32 irqstatus; >> + >> + int pm_clock_support; >> + bool is_peripherial; >> + >> + struct mram_cfg mcfg[MRAM_CFG_NUM]; >> +}; >> + >> +struct m_can_classdev *m_can_core_allocate_dev(struct device *dev); >> +int m_can_core_register(struct m_can_classdev *m_can_dev); >> +void m_can_core_unregister(struct m_can_classdev *m_can_dev); >> +int m_can_core_get_clocks(struct m_can_classdev *m_can_dev); > > You use here three different prefixes: "m_can_core", "m_can_classdev" > and "m_can_dev". There should be just one principle name for the struct, > func, args and vars, e.g.: > > int m_can_device_register(struct m_can_device *mcan_dev); > OK I will commonize the naming. I may go with the above or call it m_can_class. Dan >> +void m_can_init_ram(struct m_can_classdev *priv); >> +void m_can_config_endisable(const struct m_can_classdev *priv, bool enable); >> + >> +int m_can_core_suspend(struct device *dev); >> +int m_can_core_resume(struct device *dev); >> +#endif /* _CAN_M_CAN_CORE_H_ */ >> > > Wolfgang > -- ------------------ Dan Murphy
Hello Dan, Am 22.01.19 um 14:04 schrieb Dan Murphy: > Wolfgang > > Thanks for the review > > On 1/22/19 2:16 AM, Wolfgang Grandegger wrote: >> Hello Dan, >> >> looks already quite good... >> >> Am 17.01.19 um 21:05 schrieb Dan Murphy: >>> Create a m_can platform framework that peripherial >>> devices can register to and use common code and register sets. >>> The peripherial devices may provide read/write and configuration >>> support of the IP. >>> >>> Signed-off-by: Dan Murphy <dmurphy@ti.com> >>> --- >>> drivers/net/can/m_can/m_can.c | 6 + >>> drivers/net/can/m_can/m_can_platform.c | 209 +++++++++++++++++++++++++ >>> drivers/net/can/m_can/m_can_platform.h | 163 +++++++++++++++++++ >>> 3 files changed, 378 insertions(+) >>> create mode 100644 drivers/net/can/m_can/m_can_platform.c >>> create mode 100644 drivers/net/can/m_can/m_can_platform.h >>> >>> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c >>> index 9b449400376b..f817b28582e9 100644 >>> --- a/drivers/net/can/m_can/m_can.c >>> +++ b/drivers/net/can/m_can/m_can.c >>> @@ -414,6 +414,9 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv, >>> u32 timeout = 10; >>> u32 val = 0; >>> >>> + if (cccr & CCCR_CSR) >>> + cccr &= ~CCCR_CSR; >>> + >> >> This is an unrelated change/fix. Should go somewhere else. >> > > I thought I pulled this and the change below out of of this patchset. > >>> if (enable) { >>> /* enable m_can configuration */ >>> m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT); >>> @@ -1155,6 +1158,9 @@ static void m_can_chip_config(struct net_device *dev) >>> m_can_set_bittiming(dev); >>> >>> m_can_config_endisable(priv, false); >>> + >>> + if (priv->device_init) >>> + priv->device_init(priv); >>> } >>> >>> static void m_can_start(struct net_device *dev) >>> diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c >>> new file mode 100644 >>> index 000000000000..03172911323a >>> --- /dev/null >>> +++ b/drivers/net/can/m_can/m_can_platform.c >>> @@ -0,0 +1,209 @@ >>> +/* >>> + * CAN bus driver for Bosch M_CAN controller >>> + * >>> + * Copyright (C) 2014 Freescale Semiconductor, Inc. >>> + * Dong Aisheng <b29396@freescale.com> >>> + * >>> + * Bosch M_CAN user manual can be obtained from: >>> + * http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/ >>> + * mcan_users_manual_v302.pdf >>> + * >>> + * This file is licensed under the terms of the GNU General Public >>> + * License version 2. This program is licensed "as is" without any >>> + * warranty of any kind, whether express or implied. >>> + */ >>> + >>> +#include <linux/clk.h> >>> +#include <linux/interrupt.h> >>> +#include <linux/io.h> >>> +#include <linux/kernel.h> >>> +#include <linux/module.h> >>> +#include <linux/netdevice.h> >>> +#include <linux/platform_device.h> >>> +#include <linux/pm_runtime.h> >>> +#include <linux/can/dev.h> >>> +#include <linux/pinctrl/consumer.h> >>> + >>> +#include "m_can_platform.h" >>> + >>> +struct m_can_plat_priv { >>> + void __iomem *base; >>> + void __iomem *mram_base; >>> +}; >>> + >>> +static u32 iomap_read_reg(struct m_can_classdev *m_can_class, int reg) >>> +{ >>> + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; >>> + >>> + return readl(priv->base + reg); >>> +} >>> + >>> +static u32 iomap_read_fifo(struct m_can_classdev *m_can_class, int addr_offset) >> >> Why not just "offset". >> > > I can change the name > >>> +{ >>> + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; >>> + >>> + return readl(priv->mram_base + addr_offset); >>> +} >>> + >>> +static int iomap_write_reg(struct m_can_classdev *m_can_class, int reg, int val) >>> +{ >>> + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; >>> + >>> + writel(val, priv->base + reg); >>> + >>> + return 0; >>> +} >>> + >>> +static int iomap_write_fifo(struct m_can_classdev *m_can_class, int addr_offset, int val) >>> +{ >>> + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; >>> + >>> + writel(val, priv->base + addr_offset); >>> + >>> + return 0; >>> +} >>> + >>> +static int m_can_plat_probe(struct platform_device *pdev) >>> +{ >>> + struct m_can_classdev *mcan_class; >>> + struct m_can_plat_priv *priv; >>> + struct resource *res; >>> + void __iomem *addr; >>> + void __iomem *mram_addr; >>> + int irq, ret = 0; >>> + >>> + mcan_class = m_can_core_allocate_dev(&pdev->dev); >>> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); >>> + if (!priv) >>> + return -ENOMEM; >>> + >>> + mcan_class->device_data = priv; >>> + >>> + m_can_core_get_clocks(mcan_class); >>> + >>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can"); >>> + addr = devm_ioremap_resource(&pdev->dev, res); >>> + irq = platform_get_irq_byname(pdev, "int0"); >>> + if (IS_ERR(addr) || irq < 0) { >>> + ret = -EINVAL; >>> + goto failed_ret; >>> + } >>> + >>> + /* message ram could be shared */ >>> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); >>> + if (!res) { >>> + ret = -ENODEV; >>> + goto failed_ret; >>> + } >>> + >>> + mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res)); >>> + if (!mram_addr) { >>> + ret = -ENOMEM; >>> + goto failed_ret; >>> + } >>> + >>> + priv->base = addr; >>> + priv->mram_base = mram_addr; >>> + >>> + mcan_class->net->irq = irq; >>> + mcan_class->pm_clock_support = 1; >>> + mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk); >>> + mcan_class->dev = &pdev->dev; >>> + >>> + mcan_class->read_reg = &iomap_read_reg; >>> + mcan_class->write_reg = &iomap_write_reg; >>> + mcan_class->write_fifo = &iomap_write_fifo; >>> + mcan_class->read_fifo = &iomap_read_fifo; >> >> No "&" please! >> > > OK. But can I ask why? Well, to be honest, I cannot remember :(. I know that the convention in the Linux kernel is without "&". Maybe somebody else can explain it!? > >>> + mcan_class->is_peripherial = false; >>> + >>> + platform_set_drvdata(pdev, mcan_class->dev); >>> + >>> + m_can_init_ram(mcan_class); >>> + >>> + ret = m_can_core_register(mcan_class); >>> + >>> +failed_ret: >>> + return ret; >>> +} >>> + >>> +static __maybe_unused int m_can_suspend(struct device *dev) >>> +{ >>> + return m_can_core_suspend(dev); >>> +} >>> + >>> +static __maybe_unused int m_can_resume(struct device *dev) >>> +{ >>> + return m_can_core_resume(dev); >>> +} >>> + >>> +static int m_can_plat_remove(struct platform_device *pdev) >>> +{ >>> + struct net_device *dev = platform_get_drvdata(pdev); >>> + struct m_can_classdev *mcan_class = netdev_priv(dev); >>> + >>> + m_can_core_unregister(mcan_class); >>> + >>> + platform_set_drvdata(pdev, NULL); >>> + >>> + return 0; >>> +} >>> + >>> +static int __maybe_unused m_can_runtime_suspend(struct device *dev) >>> +{ >>> + struct net_device *ndev = dev_get_drvdata(dev); >>> + struct m_can_classdev *mcan_class = netdev_priv(ndev); >>> + >>> + m_can_core_suspend(dev); >>> + >>> + clk_disable_unprepare(mcan_class->cclk); >>> + clk_disable_unprepare(mcan_class->hclk); >>> + >>> + return 0; >>> +} >>> + >>> +static int __maybe_unused m_can_runtime_resume(struct device *dev) >>> +{ >>> + struct net_device *ndev = dev_get_drvdata(dev); >>> + struct m_can_classdev *mcan_class = netdev_priv(ndev); >>> + int err; >>> + >>> + err = clk_prepare_enable(mcan_class->hclk); >>> + if (err) >>> + return err; >>> + >>> + err = clk_prepare_enable(mcan_class->cclk); >>> + if (err) >>> + clk_disable_unprepare(mcan_class->hclk); >>> + >>> + m_can_core_resume(dev); >>> + >>> + return err; >>> +} >>> + >>> +static const struct dev_pm_ops m_can_pmops = { >>> + SET_RUNTIME_PM_OPS(m_can_runtime_suspend, >>> + m_can_runtime_resume, NULL) >>> + SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume) >>> +}; >>> + >>> +static const struct of_device_id m_can_of_table[] = { >>> + { .compatible = "bosch,m_can", .data = NULL }, >>> + { /* sentinel */ }, >>> +}; >>> +MODULE_DEVICE_TABLE(of, m_can_of_table); >>> + >>> +static struct platform_driver m_can_plat_driver = { >>> + .driver = { >>> + .name = KBUILD_MODNAME, >>> + .of_match_table = m_can_of_table, >>> + .pm = &m_can_pmops, >>> + }, >>> + .probe = m_can_plat_probe, >>> + .remove = m_can_plat_remove, >>> +}; >>> + >>> +module_platform_driver(m_can_plat_driver); >>> + >>> +MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>"); >> >> Feel free to add yourself as second author. >> >>> +MODULE_LICENSE("GPL v2"); >>> +MODULE_DESCRIPTION("CAN bus driver for Bosch M_CAN controller"); >>> diff --git a/drivers/net/can/m_can/m_can_platform.h b/drivers/net/can/m_can/m_can_platform.h >>> new file mode 100644 >>> index 000000000000..97e90dd79613 >>> --- /dev/null >>> +++ b/drivers/net/can/m_can/m_can_platform.h >> >> These are common definitions, right? Therefore the filen name should be >> "m_can.h"!? >> > > Ah yes. My mistake common m_can definitions should be just m_can. > >>> @@ -0,0 +1,163 @@ >>> +// SPDX-License-Identifier: GPL-2.0 >>> +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ >>> + >>> +#ifndef _CAN_M_CAN_CORE_H_ >>> +#define _CAN_M_CAN_CORE_H_ >>> + >>> +#include <linux/can/core.h> >>> +#include <linux/can/led.h> >>> +#include <linux/completion.h> >>> +#include <linux/device.h> >>> +#include <linux/dma-mapping.h> >>> +#include <linux/freezer.h> >>> +#include <linux/slab.h> >>> +#include <linux/uaccess.h> >>> +#include <linux/clk.h> >>> +#include <linux/delay.h> >>> +#include <linux/interrupt.h> >>> +#include <linux/io.h> >>> +#include <linux/kernel.h> >>> +#include <linux/module.h> >>> +#include <linux/netdevice.h> >>> +#include <linux/of.h> >>> +#include <linux/of_device.h> >>> +#include <linux/pm_runtime.h> >>> +#include <linux/iopoll.h> >>> +#include <linux/can/dev.h> >>> +#include <linux/pinctrl/consumer.h> >> >> Do you really need them all in this header file? >> > > Probably not just a copy paste from the original m_can. I will go through them and > keep the common headers. > >>> + >>> +/* m_can lec values */ >>> +enum m_can_lec_type { >>> + LEC_NO_ERROR = 0, >>> + LEC_STUFF_ERROR, >>> + LEC_FORM_ERROR, >>> + LEC_ACK_ERROR, >>> + LEC_BIT1_ERROR, >>> + LEC_BIT0_ERROR, >>> + LEC_CRC_ERROR, >>> + LEC_UNUSED, >>> +}; >>> + >>> +enum m_can_mram_cfg { >>> + MRAM_SIDF = 0, >>> + MRAM_XIDF, >>> + MRAM_RXF0, >>> + MRAM_RXF1, >>> + MRAM_RXB, >>> + MRAM_TXE, >>> + MRAM_TXB, >>> + MRAM_CFG_NUM, >>> +}; >>> + >>> +/* registers definition */ >>> +enum m_can_reg { >>> + M_CAN_CREL = 0x0, >>> + M_CAN_ENDN = 0x4, >>> + M_CAN_CUST = 0x8, >>> + M_CAN_DBTP = 0xc, >>> + M_CAN_TEST = 0x10, >>> + M_CAN_RWD = 0x14, >>> + M_CAN_CCCR = 0x18, >>> + M_CAN_NBTP = 0x1c, >>> + M_CAN_TSCC = 0x20, >>> + M_CAN_TSCV = 0x24, >>> + M_CAN_TOCC = 0x28, >>> + M_CAN_TOCV = 0x2c, >>> + M_CAN_ECR = 0x40, >>> + M_CAN_PSR = 0x44, >>> +/* TDCR Register only available for version >=3.1.x */ >>> + M_CAN_TDCR = 0x48, >>> + M_CAN_IR = 0x50, >>> + M_CAN_IE = 0x54, >>> + M_CAN_ILS = 0x58, >>> + M_CAN_ILE = 0x5c, >>> + M_CAN_GFC = 0x80, >>> + M_CAN_SIDFC = 0x84, >>> + M_CAN_XIDFC = 0x88, >>> + M_CAN_XIDAM = 0x90, >>> + M_CAN_HPMS = 0x94, >>> + M_CAN_NDAT1 = 0x98, >>> + M_CAN_NDAT2 = 0x9c, >>> + M_CAN_RXF0C = 0xa0, >>> + M_CAN_RXF0S = 0xa4, >>> + M_CAN_RXF0A = 0xa8, >>> + M_CAN_RXBC = 0xac, >>> + M_CAN_RXF1C = 0xb0, >>> + M_CAN_RXF1S = 0xb4, >>> + M_CAN_RXF1A = 0xb8, >>> + M_CAN_RXESC = 0xbc, >>> + M_CAN_TXBC = 0xc0, >>> + M_CAN_TXFQS = 0xc4, >>> + M_CAN_TXESC = 0xc8, >>> + M_CAN_TXBRP = 0xcc, >>> + M_CAN_TXBAR = 0xd0, >>> + M_CAN_TXBCR = 0xd4, >>> + M_CAN_TXBTO = 0xd8, >>> + M_CAN_TXBCF = 0xdc, >>> + M_CAN_TXBTIE = 0xe0, >>> + M_CAN_TXBCIE = 0xe4, >>> + M_CAN_TXEFC = 0xf0, >>> + M_CAN_TXEFS = 0xf4, >>> + M_CAN_TXEFA = 0xf8, >>> +}; >>> + >>> +/* address offset and element number for each FIFO/Buffer in the Message RAM */ >>> +struct mram_cfg { >>> + u16 off; >>> + u8 num; >>> +}; >>> + >>> +struct m_can_classdev; >>> + >>> +typedef int (*can_dev_init) (struct m_can_classdev *m_can_class); >>> +typedef int (*can_clr_dev_interrupts) (struct m_can_classdev *m_can_class); >>> +typedef u32 (*can_reg_read) (struct m_can_classdev *m_can_class, int reg); >>> +typedef int (*can_reg_write) (struct m_can_classdev *m_can_class, int reg, int val); >>> +typedef u32 (*can_fifo_read) (struct m_can_classdev *m_can_class, int addr_offset); >>> +typedef int (*can_fifo_write) (struct m_can_classdev *m_can_class, int addr_offset, int val); >> >> No typedefs in the kernel, please! >> > > OK. Just following some other conventions. I can remove See https://elixir.bootlin.com/linux/latest/source/Documentation/process/coding-style.rst#L318 > >>> +struct m_can_classdev { >>> + struct can_priv can; >>> + struct napi_struct napi; >>> + struct net_device *net; >>> + struct device *dev; >>> + struct clk *hclk; >>> + struct clk *cclk; >>> + >>> + struct workqueue_struct *wq; >>> + struct work_struct tx_work; >>> + struct sk_buff *skb; >>> + >>> + struct can_bittiming_const *bit_timing; >>> + struct can_bittiming_const *data_timing; >>> + >>> + void *device_data; >>> + >>> + /* Device specific call backs */ >>> + can_dev_init device_init; >>> + can_clr_dev_interrupts clr_dev_interrupts; >>> + can_reg_read read_reg; >>> + can_reg_write write_reg; >>> + can_fifo_read read_fifo; >>> + can_fifo_write write_fifo; >>> + >>> + int version; >>> + int freq; >>> + u32 irqstatus; >>> + >>> + int pm_clock_support; >>> + bool is_peripherial; >>> + >>> + struct mram_cfg mcfg[MRAM_CFG_NUM]; >>> +}; >>> + >>> +struct m_can_classdev *m_can_core_allocate_dev(struct device *dev); >>> +int m_can_core_register(struct m_can_classdev *m_can_dev); >>> +void m_can_core_unregister(struct m_can_classdev *m_can_dev); >>> +int m_can_core_get_clocks(struct m_can_classdev *m_can_dev); >> >> You use here three different prefixes: "m_can_core", "m_can_classdev" >> and "m_can_dev". There should be just one principle name for the struct, >> func, args and vars, e.g.: >> >> int m_can_device_register(struct m_can_device *mcan_dev); >> > > OK I will commonize the naming. I may go with the above or call it m_can_class. See also my related comment in the next patch. Wolfgang.
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 9b449400376b..f817b28582e9 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -414,6 +414,9 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv, u32 timeout = 10; u32 val = 0; + if (cccr & CCCR_CSR) + cccr &= ~CCCR_CSR; + if (enable) { /* enable m_can configuration */ m_can_write(priv, M_CAN_CCCR, cccr | CCCR_INIT); @@ -1155,6 +1158,9 @@ static void m_can_chip_config(struct net_device *dev) m_can_set_bittiming(dev); m_can_config_endisable(priv, false); + + if (priv->device_init) + priv->device_init(priv); } static void m_can_start(struct net_device *dev) diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c new file mode 100644 index 000000000000..03172911323a --- /dev/null +++ b/drivers/net/can/m_can/m_can_platform.c @@ -0,0 +1,209 @@ +/* + * CAN bus driver for Bosch M_CAN controller + * + * Copyright (C) 2014 Freescale Semiconductor, Inc. + * Dong Aisheng <b29396@freescale.com> + * + * Bosch M_CAN user manual can be obtained from: + * http://www.bosch-semiconductors.de/media/pdf_1/ipmodules_1/m_can/ + * mcan_users_manual_v302.pdf + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/clk.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/can/dev.h> +#include <linux/pinctrl/consumer.h> + +#include "m_can_platform.h" + +struct m_can_plat_priv { + void __iomem *base; + void __iomem *mram_base; +}; + +static u32 iomap_read_reg(struct m_can_classdev *m_can_class, int reg) +{ + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; + + return readl(priv->base + reg); +} + +static u32 iomap_read_fifo(struct m_can_classdev *m_can_class, int addr_offset) +{ + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; + + return readl(priv->mram_base + addr_offset); +} + +static int iomap_write_reg(struct m_can_classdev *m_can_class, int reg, int val) +{ + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; + + writel(val, priv->base + reg); + + return 0; +} + +static int iomap_write_fifo(struct m_can_classdev *m_can_class, int addr_offset, int val) +{ + struct m_can_plat_priv *priv = (struct m_can_plat_priv *)m_can_class->device_data; + + writel(val, priv->base + addr_offset); + + return 0; +} + +static int m_can_plat_probe(struct platform_device *pdev) +{ + struct m_can_classdev *mcan_class; + struct m_can_plat_priv *priv; + struct resource *res; + void __iomem *addr; + void __iomem *mram_addr; + int irq, ret = 0; + + mcan_class = m_can_core_allocate_dev(&pdev->dev); + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + mcan_class->device_data = priv; + + m_can_core_get_clocks(mcan_class); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can"); + addr = devm_ioremap_resource(&pdev->dev, res); + irq = platform_get_irq_byname(pdev, "int0"); + if (IS_ERR(addr) || irq < 0) { + ret = -EINVAL; + goto failed_ret; + } + + /* message ram could be shared */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram"); + if (!res) { + ret = -ENODEV; + goto failed_ret; + } + + mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + if (!mram_addr) { + ret = -ENOMEM; + goto failed_ret; + } + + priv->base = addr; + priv->mram_base = mram_addr; + + mcan_class->net->irq = irq; + mcan_class->pm_clock_support = 1; + mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk); + mcan_class->dev = &pdev->dev; + + mcan_class->read_reg = &iomap_read_reg; + mcan_class->write_reg = &iomap_write_reg; + mcan_class->write_fifo = &iomap_write_fifo; + mcan_class->read_fifo = &iomap_read_fifo; + mcan_class->is_peripherial = false; + + platform_set_drvdata(pdev, mcan_class->dev); + + m_can_init_ram(mcan_class); + + ret = m_can_core_register(mcan_class); + +failed_ret: + return ret; +} + +static __maybe_unused int m_can_suspend(struct device *dev) +{ + return m_can_core_suspend(dev); +} + +static __maybe_unused int m_can_resume(struct device *dev) +{ + return m_can_core_resume(dev); +} + +static int m_can_plat_remove(struct platform_device *pdev) +{ + struct net_device *dev = platform_get_drvdata(pdev); + struct m_can_classdev *mcan_class = netdev_priv(dev); + + m_can_core_unregister(mcan_class); + + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static int __maybe_unused m_can_runtime_suspend(struct device *dev) +{ + struct net_device *ndev = dev_get_drvdata(dev); + struct m_can_classdev *mcan_class = netdev_priv(ndev); + + m_can_core_suspend(dev); + + clk_disable_unprepare(mcan_class->cclk); + clk_disable_unprepare(mcan_class->hclk); + + return 0; +} + +static int __maybe_unused m_can_runtime_resume(struct device *dev) +{ + struct net_device *ndev = dev_get_drvdata(dev); + struct m_can_classdev *mcan_class = netdev_priv(ndev); + int err; + + err = clk_prepare_enable(mcan_class->hclk); + if (err) + return err; + + err = clk_prepare_enable(mcan_class->cclk); + if (err) + clk_disable_unprepare(mcan_class->hclk); + + m_can_core_resume(dev); + + return err; +} + +static const struct dev_pm_ops m_can_pmops = { + SET_RUNTIME_PM_OPS(m_can_runtime_suspend, + m_can_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume) +}; + +static const struct of_device_id m_can_of_table[] = { + { .compatible = "bosch,m_can", .data = NULL }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, m_can_of_table); + +static struct platform_driver m_can_plat_driver = { + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = m_can_of_table, + .pm = &m_can_pmops, + }, + .probe = m_can_plat_probe, + .remove = m_can_plat_remove, +}; + +module_platform_driver(m_can_plat_driver); + +MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("CAN bus driver for Bosch M_CAN controller"); diff --git a/drivers/net/can/m_can/m_can_platform.h b/drivers/net/can/m_can/m_can_platform.h new file mode 100644 index 000000000000..97e90dd79613 --- /dev/null +++ b/drivers/net/can/m_can/m_can_platform.h @@ -0,0 +1,163 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ + +#ifndef _CAN_M_CAN_CORE_H_ +#define _CAN_M_CAN_CORE_H_ + +#include <linux/can/core.h> +#include <linux/can/led.h> +#include <linux/completion.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/freezer.h> +#include <linux/slab.h> +#include <linux/uaccess.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/pm_runtime.h> +#include <linux/iopoll.h> +#include <linux/can/dev.h> +#include <linux/pinctrl/consumer.h> + +/* m_can lec values */ +enum m_can_lec_type { + LEC_NO_ERROR = 0, + LEC_STUFF_ERROR, + LEC_FORM_ERROR, + LEC_ACK_ERROR, + LEC_BIT1_ERROR, + LEC_BIT0_ERROR, + LEC_CRC_ERROR, + LEC_UNUSED, +}; + +enum m_can_mram_cfg { + MRAM_SIDF = 0, + MRAM_XIDF, + MRAM_RXF0, + MRAM_RXF1, + MRAM_RXB, + MRAM_TXE, + MRAM_TXB, + MRAM_CFG_NUM, +}; + +/* registers definition */ +enum m_can_reg { + M_CAN_CREL = 0x0, + M_CAN_ENDN = 0x4, + M_CAN_CUST = 0x8, + M_CAN_DBTP = 0xc, + M_CAN_TEST = 0x10, + M_CAN_RWD = 0x14, + M_CAN_CCCR = 0x18, + M_CAN_NBTP = 0x1c, + M_CAN_TSCC = 0x20, + M_CAN_TSCV = 0x24, + M_CAN_TOCC = 0x28, + M_CAN_TOCV = 0x2c, + M_CAN_ECR = 0x40, + M_CAN_PSR = 0x44, +/* TDCR Register only available for version >=3.1.x */ + M_CAN_TDCR = 0x48, + M_CAN_IR = 0x50, + M_CAN_IE = 0x54, + M_CAN_ILS = 0x58, + M_CAN_ILE = 0x5c, + M_CAN_GFC = 0x80, + M_CAN_SIDFC = 0x84, + M_CAN_XIDFC = 0x88, + M_CAN_XIDAM = 0x90, + M_CAN_HPMS = 0x94, + M_CAN_NDAT1 = 0x98, + M_CAN_NDAT2 = 0x9c, + M_CAN_RXF0C = 0xa0, + M_CAN_RXF0S = 0xa4, + M_CAN_RXF0A = 0xa8, + M_CAN_RXBC = 0xac, + M_CAN_RXF1C = 0xb0, + M_CAN_RXF1S = 0xb4, + M_CAN_RXF1A = 0xb8, + M_CAN_RXESC = 0xbc, + M_CAN_TXBC = 0xc0, + M_CAN_TXFQS = 0xc4, + M_CAN_TXESC = 0xc8, + M_CAN_TXBRP = 0xcc, + M_CAN_TXBAR = 0xd0, + M_CAN_TXBCR = 0xd4, + M_CAN_TXBTO = 0xd8, + M_CAN_TXBCF = 0xdc, + M_CAN_TXBTIE = 0xe0, + M_CAN_TXBCIE = 0xe4, + M_CAN_TXEFC = 0xf0, + M_CAN_TXEFS = 0xf4, + M_CAN_TXEFA = 0xf8, +}; + +/* address offset and element number for each FIFO/Buffer in the Message RAM */ +struct mram_cfg { + u16 off; + u8 num; +}; + +struct m_can_classdev; + +typedef int (*can_dev_init) (struct m_can_classdev *m_can_class); +typedef int (*can_clr_dev_interrupts) (struct m_can_classdev *m_can_class); +typedef u32 (*can_reg_read) (struct m_can_classdev *m_can_class, int reg); +typedef int (*can_reg_write) (struct m_can_classdev *m_can_class, int reg, int val); +typedef u32 (*can_fifo_read) (struct m_can_classdev *m_can_class, int addr_offset); +typedef int (*can_fifo_write) (struct m_can_classdev *m_can_class, int addr_offset, int val); + +struct m_can_classdev { + struct can_priv can; + struct napi_struct napi; + struct net_device *net; + struct device *dev; + struct clk *hclk; + struct clk *cclk; + + struct workqueue_struct *wq; + struct work_struct tx_work; + struct sk_buff *skb; + + struct can_bittiming_const *bit_timing; + struct can_bittiming_const *data_timing; + + void *device_data; + + /* Device specific call backs */ + can_dev_init device_init; + can_clr_dev_interrupts clr_dev_interrupts; + can_reg_read read_reg; + can_reg_write write_reg; + can_fifo_read read_fifo; + can_fifo_write write_fifo; + + int version; + int freq; + u32 irqstatus; + + int pm_clock_support; + bool is_peripherial; + + struct mram_cfg mcfg[MRAM_CFG_NUM]; +}; + +struct m_can_classdev *m_can_core_allocate_dev(struct device *dev); +int m_can_core_register(struct m_can_classdev *m_can_dev); +void m_can_core_unregister(struct m_can_classdev *m_can_dev); +int m_can_core_get_clocks(struct m_can_classdev *m_can_dev); +void m_can_init_ram(struct m_can_classdev *priv); +void m_can_config_endisable(const struct m_can_classdev *priv, bool enable); + +int m_can_core_suspend(struct device *dev); +int m_can_core_resume(struct device *dev); +#endif /* _CAN_M_CAN_CORE_H_ */
Create a m_can platform framework that peripherial devices can register to and use common code and register sets. The peripherial devices may provide read/write and configuration support of the IP. Signed-off-by: Dan Murphy <dmurphy@ti.com> --- drivers/net/can/m_can/m_can.c | 6 + drivers/net/can/m_can/m_can_platform.c | 209 +++++++++++++++++++++++++ drivers/net/can/m_can/m_can_platform.h | 163 +++++++++++++++++++ 3 files changed, 378 insertions(+) create mode 100644 drivers/net/can/m_can/m_can_platform.c create mode 100644 drivers/net/can/m_can/m_can_platform.h -- 2.20.1.98.gecbdaf0899