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Date: Thu, 14 Jun 2012 19:58:14 +0800
From: Bhupesh SHARMA <bhupesh.sharma@...com>
To: Federico Vaga <federico.vaga@...il.com>,
Wolfgang Grandegger <wg@...ndegger.com>,
Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Giancarlo ASNAGHI <giancarlo.asnaghi@...com>,
Alan Cox <alan@...ux.intel.com>,
"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
AnilKumar Chimata <anilkumar@...com>,
Alessandro Rubini <rubini@...dd.com>
Subject: RE: [PATCH] c_can_pci: generic module for C_CAN/D_CAN on PCI
Hi Federico,
Thanks for the patch.
> -----Original Message-----
> From: Federico Vaga [mailto:federico.vaga@...il.com]
> Sent: Thursday, June 14, 2012 5:14 PM
> To: Wolfgang Grandegger; Marc Kleine-Budde
> Cc: Giancarlo ASNAGHI; Alan Cox; linux-can@...r.kernel.org;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Bhupesh SHARMA;
> AnilKumar Chimata; Alessandro Rubini; Federico Vaga
> Subject: [PATCH] c_can_pci: generic module for C_CAN/D_CAN on PCI
>
> Signed-off-by: Federico Vaga <federico.vaga@...il.com>
> Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@...com>
> Cc: Alan Cox <alan@...ux.intel.com>
> ---
> drivers/net/can/c_can/Kconfig | 7 ++
> drivers/net/can/c_can/Makefile | 1 +
> drivers/net/can/c_can/c_can_pci.c | 236
> +++++++++++++++++++++++++++++++++++++
> 3 files changed, 244 insertions(+)
> create mode 100644 drivers/net/can/c_can/c_can_pci.c
>
> diff --git a/drivers/net/can/c_can/Kconfig
> b/drivers/net/can/c_can/Kconfig
> index 25d371c..3b83baf 100644
> --- a/drivers/net/can/c_can/Kconfig
> +++ b/drivers/net/can/c_can/Kconfig
> @@ -13,4 +13,11 @@ config CAN_C_CAN_PLATFORM
> boards from ST Microelectronics (http://www.st.com) like the
> SPEAr1310 and SPEAr320 evaluation boards & TI (www.ti.com)
> boards like am335x, dm814x, dm813x and dm811x.
> +
> +config CAN_C_CAN_PCI
> + tristate "Generic PCI Bus based C_CAN/D_CAN driver"
> + depends on PCI
> + ---help---
> + This driver adds support for the C_CAN/D_CAN chips connected
> + to the PCI bus.
> endif
> diff --git a/drivers/net/can/c_can/Makefile
> b/drivers/net/can/c_can/Makefile
> index 9273f6d..ad1cc84 100644
> --- a/drivers/net/can/c_can/Makefile
> +++ b/drivers/net/can/c_can/Makefile
> @@ -4,5 +4,6 @@
>
> obj-$(CONFIG_CAN_C_CAN) += c_can.o
> obj-$(CONFIG_CAN_C_CAN_PLATFORM) += c_can_platform.o
> +obj-$(CONFIG_CAN_C_CAN_PCI) += c_can_pci.o
>
> ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
> diff --git a/drivers/net/can/c_can/c_can_pci.c
> b/drivers/net/can/c_can/c_can_pci.c
> new file mode 100644
> index 0000000..7bdb793
> --- /dev/null
> +++ b/drivers/net/can/c_can/c_can_pci.c
> @@ -0,0 +1,236 @@
> +/*
> + * PCI bus driver for Bosch C_CAN/D_CAN controller
> + *
> + * Copyright (C) 2012 Federico Vaga <federico.vaga@...il.com>
> + *
> + * Borrowed from c_can_platform.c
> + *
> + * 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/kernel.h>
> +#include <linux/module.h>
> +#include <linux/netdevice.h>
> +#include <linux/clk.h>
> +#include <linux/pci.h>
> +
> +#include <linux/can/dev.h>
> +
> +#include "c_can.h"
> +
> +enum c_can_pci_reg_align {
> + C_CAN_REG_ALIGN_16,
> + C_CAN_REG_ALIGN_32,
> +};
> +
> +struct c_can_pci_data {
> + /* Specify if is C_CAN or D_CAN */
> + enum c_can_dev_id type;
> + /* Set the register alignment in the memory */
> + enum c_can_pci_reg_align reg_align;
> + /* Set the frequency if clk is not usable */
> + unsigned int freq;
> +};
> +
> +/*
> + * 16-bit c_can registers can be arranged differently in the memory
> + * architecture of different implementations. For example: 16-bit
> + * registers can be aligned to a 16-bit boundary or 32-bit boundary
> etc.
> + * Handle the same by providing a common read/write interface.
> + */
> +static u16 c_can_pci_read_reg_aligned_to_16bit(struct c_can_priv
> *priv,
> + enum reg index)
> +{
> + return readw(priv->base + priv->regs[index]);
> +}
> +
> +static void c_can_pci_write_reg_aligned_to_16bit(struct c_can_priv
> *priv,
> + enum reg index, u16 val)
> +{
> + writew(val, priv->base + priv->regs[index]);
> +}
> +
> +static u16 c_can_pci_read_reg_aligned_to_32bit(struct c_can_priv
> *priv,
> + enum reg index)
> +{
> + return readw(priv->base + 2 * priv->regs[index]);
> +}
> +
> +static void c_can_pci_write_reg_aligned_to_32bit(struct c_can_priv
> *priv,
> + enum reg index, u16 val)
> +{
> + writew(val, priv->base + 2 * priv->regs[index]);
> +}
> +
> +static int __devinit c_can_pci_probe(struct pci_dev *pdev,
> + const struct pci_device_id *ent)
> +{
> + struct c_can_pci_data *c_can_pci_data = (void *)ent->driver_data;
> + struct c_can_priv *priv;
> + struct net_device *dev;
> + void __iomem *addr;
> + struct clk *clk;
> + int ret;
> +
> + ret = pci_enable_device(pdev);
> + if (ret) {
> + dev_err(&pdev->dev, "pci_enable_device FAILED\n");
> + goto out;
> + }
> +
> + ret = pci_request_regions(pdev, KBUILD_MODNAME);
> + if (ret) {
> + dev_err(&pdev->dev, "pci_request_regions FAILED\n");
> + goto out_disable_device;
> + }
> +
> + pci_set_master(pdev);
> + pci_enable_msi(pdev);
> +
> + addr = pci_iomap(pdev, 0, pci_resource_len(pdev, 0));
> + if (!addr) {
> + dev_err(&pdev->dev,
> + "device has no PCI memory resources, "
> + "failing adapter\n");
> + ret = -ENOMEM;
> + goto out_release_regions;
> + }
> +
> + /* allocate the c_can device */
> + dev = alloc_c_can_dev();
> + if (!dev) {
> + ret = -ENOMEM;
> + goto out_iounmap;
> + }
> +
> + priv = netdev_priv(dev);
> + pci_set_drvdata(pdev, dev);
> + SET_NETDEV_DEV(dev, &pdev->dev);
> +
> + dev->irq = pdev->irq;
> + priv->base = addr;
> +
> + if (!c_can_pci_data->freq) {
> + /* get the appropriate clk */
> + clk = clk_get(&pdev->dev, NULL);
> + if (IS_ERR(clk)) {
> + dev_err(&pdev->dev, "no clock defined\n");
> + ret = -ENODEV;
> + goto out_free_c_can;
> + }
> + priv->can.clock.freq = clk_get_rate(clk);
> + priv->priv = clk;
> + } else {
> + priv->can.clock.freq = c_can_pci_data->freq;
> + priv->priv = NULL;
> + }
> +
> + /* Configure CAN type */
> + switch (c_can_pci_data->type) {
> + case C_CAN_DEVTYPE:
> + priv->regs = reg_map_c_can;
> + break;
> + case D_CAN_DEVTYPE:
> + priv->regs = reg_map_d_can;
> + priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
> + break;
> + default:
> + ret = -EINVAL;
> + goto out_free_clock;
> + }
> +
> + /* Configure access to registers */
> + switch (c_can_pci_data->reg_align) {
> + case C_CAN_REG_ALIGN_32:
> + priv->read_reg = c_can_pci_read_reg_aligned_to_32bit;
> + priv->write_reg = c_can_pci_write_reg_aligned_to_32bit;
> + break;
> + case C_CAN_REG_ALIGN_16:
> + priv->read_reg = c_can_pci_read_reg_aligned_to_16bit;
> + priv->write_reg = c_can_pci_write_reg_aligned_to_16bit;
> + break;
> + default:
> + ret = -EINVAL;
> + goto out_free_clock;
> + }
> +
> + ret = register_c_can_dev(dev);
> + if (ret) {
> + dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
> + KBUILD_MODNAME, ret);
> + goto out_free_clock;
> + }
> +
> + dev_dbg(&pdev->dev, "%s device registered (regs=%p, irq=%d)\n",
> + KBUILD_MODNAME, priv->regs, dev->irq);
> +
> + return 0;
> +
> +out_free_clock:
> + if (priv->priv)
> + clk_put(priv->priv);
> +out_free_c_can:
> + pci_set_drvdata(pdev, NULL);
> + free_c_can_dev(dev);
> +out_iounmap:
> + pci_iounmap(pdev, priv->base);
> +out_release_regions:
> + pci_disable_msi(pdev);
> + pci_clear_master(pdev);
> + pci_release_regions(pdev);
> +out_disable_device:
> + pci_disable_device(pdev);
> +out:
> + return ret;
> +}
> +
> +static void __devexit c_can_pci_remove(struct pci_dev *pdev)
> +{
> + struct net_device *dev = pci_get_drvdata(pdev);
> + struct c_can_priv *priv = netdev_priv(dev);
> +
> + unregister_c_can_dev(dev);
> +
> + if (priv->priv)
> + clk_put(priv->priv);
> +
> + pci_set_drvdata(pdev, NULL);
> + free_c_can_dev(dev);
> +
> + pci_iounmap(pdev, priv->base);
> + pci_disable_msi(pdev);
> + pci_clear_master(pdev);
> + pci_release_regions(pdev);
> + pci_disable_device(pdev);
> +}
> +
> +static struct c_can_pci_data c_can_sta2x11= {
> + .type = C_CAN_DEVTYPE,
> + .reg_align = C_CAN_REG_ALIGN_32,
> + .freq = 52000000, /* 52 Mhz */
> +};
> +
> +#define C_CAN_ID(_vend, _dev, _driverdata) { \
> + PCI_DEVICE(_vend, _dev), \
> + .driver_data = (unsigned long)&_driverdata, \
> +}
> +static DEFINE_PCI_DEVICE_TABLE(c_can_pci_tbl) = {
> + C_CAN_ID(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_CAN,
> + c_can_sta2x11),
> + {},
> +};
> +static struct pci_driver c_can_pci_driver = {
> + .name = KBUILD_MODNAME,
> + .id_table = c_can_pci_tbl,
> + .probe = c_can_pci_probe,
> + .remove = __devexit_p(c_can_pci_remove),
> +};
> +
> +module_pci_driver(c_can_pci_driver);
> +
> +MODULE_AUTHOR("Federico Vaga <federico.vaga@...il.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("PCI CAN bus driver for Bosch C_CAN/D_CAN
> controller");
> +MODULE_DEVICE_TABLE(pci, c_can_pci_tbl);
> --
Acked-by: Bhupesh Sharma <bhupesh.sharma@...com>
Regards,
Bhupesh
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