339 lines
8.1 KiB
C
339 lines
8.1 KiB
C
/*
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* Platform CAN bus driver for Bosch C_CAN controller
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*
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* Copyright (C) 2010 ST Microelectronics
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* Bhupesh Sharma <bhupesh.sharma@st.com>
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*
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* Borrowed heavily from the C_CAN driver originally written by:
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* Copyright (C) 2007
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* - Sascha Hauer, Marc Kleine-Budde, Pengutronix <s.hauer@pengutronix.de>
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* - Simon Kallweit, intefo AG <simon.kallweit@intefo.ch>
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*
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* Bosch C_CAN controller is compliant to CAN protocol version 2.0 part A and B.
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* Bosch C_CAN user manual can be obtained from:
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* http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/c_can/
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* users_manual_c_can.pdf
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/if_ether.h>
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#include <linux/list.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/can/dev.h>
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#include "c_can.h"
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#define CAN_RAMINIT_START_MASK(i) (1 << (i))
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/*
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* 16-bit c_can registers can be arranged differently in the memory
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* architecture of different implementations. For example: 16-bit
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* registers can be aligned to a 16-bit boundary or 32-bit boundary etc.
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* Handle the same by providing a common read/write interface.
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*/
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static u16 c_can_plat_read_reg_aligned_to_16bit(struct c_can_priv *priv,
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enum reg index)
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{
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return readw(priv->base + priv->regs[index]);
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}
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static void c_can_plat_write_reg_aligned_to_16bit(struct c_can_priv *priv,
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enum reg index, u16 val)
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{
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writew(val, priv->base + priv->regs[index]);
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}
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static u16 c_can_plat_read_reg_aligned_to_32bit(struct c_can_priv *priv,
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enum reg index)
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{
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return readw(priv->base + 2 * priv->regs[index]);
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}
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static void c_can_plat_write_reg_aligned_to_32bit(struct c_can_priv *priv,
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enum reg index, u16 val)
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{
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writew(val, priv->base + 2 * priv->regs[index]);
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}
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static void c_can_hw_raminit(const struct c_can_priv *priv, bool enable)
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{
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u32 val;
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val = readl(priv->raminit_ctrlreg);
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if (enable)
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val |= CAN_RAMINIT_START_MASK(priv->instance);
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else
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val &= ~CAN_RAMINIT_START_MASK(priv->instance);
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writel(val, priv->raminit_ctrlreg);
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}
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static struct platform_device_id c_can_id_table[] = {
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[BOSCH_C_CAN_PLATFORM] = {
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.name = KBUILD_MODNAME,
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.driver_data = BOSCH_C_CAN,
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},
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[BOSCH_C_CAN] = {
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.name = "c_can",
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.driver_data = BOSCH_C_CAN,
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},
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[BOSCH_D_CAN] = {
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.name = "d_can",
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.driver_data = BOSCH_D_CAN,
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}, {
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}
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};
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MODULE_DEVICE_TABLE(platform, c_can_id_table);
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static const struct of_device_id c_can_of_table[] = {
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{ .compatible = "bosch,c_can", .data = &c_can_id_table[BOSCH_C_CAN] },
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{ .compatible = "bosch,d_can", .data = &c_can_id_table[BOSCH_D_CAN] },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, c_can_of_table);
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static int c_can_plat_probe(struct platform_device *pdev)
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{
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int ret;
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void __iomem *addr;
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struct net_device *dev;
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struct c_can_priv *priv;
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const struct of_device_id *match;
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const struct platform_device_id *id;
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struct resource *mem, *res;
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int irq;
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struct clk *clk;
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if (pdev->dev.of_node) {
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match = of_match_device(c_can_of_table, &pdev->dev);
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if (!match) {
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dev_err(&pdev->dev, "Failed to find matching dt id\n");
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ret = -EINVAL;
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goto exit;
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}
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id = match->data;
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} else {
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id = platform_get_device_id(pdev);
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}
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/* get the appropriate clk */
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clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(clk)) {
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dev_err(&pdev->dev, "no clock defined\n");
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ret = -ENODEV;
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goto exit;
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}
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/* get the platform data */
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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irq = platform_get_irq(pdev, 0);
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if (!mem || irq <= 0) {
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ret = -ENODEV;
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goto exit_free_clk;
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}
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if (!request_mem_region(mem->start, resource_size(mem),
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KBUILD_MODNAME)) {
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dev_err(&pdev->dev, "resource unavailable\n");
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ret = -ENODEV;
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goto exit_free_clk;
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}
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addr = ioremap(mem->start, resource_size(mem));
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if (!addr) {
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dev_err(&pdev->dev, "failed to map can port\n");
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ret = -ENOMEM;
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goto exit_release_mem;
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}
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/* allocate the c_can device */
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dev = alloc_c_can_dev();
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if (!dev) {
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ret = -ENOMEM;
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goto exit_iounmap;
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}
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priv = netdev_priv(dev);
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switch (id->driver_data) {
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case BOSCH_C_CAN:
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priv->regs = reg_map_c_can;
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switch (mem->flags & IORESOURCE_MEM_TYPE_MASK) {
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case IORESOURCE_MEM_32BIT:
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priv->read_reg = c_can_plat_read_reg_aligned_to_32bit;
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priv->write_reg = c_can_plat_write_reg_aligned_to_32bit;
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break;
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case IORESOURCE_MEM_16BIT:
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default:
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priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
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priv->write_reg = c_can_plat_write_reg_aligned_to_16bit;
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break;
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}
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break;
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case BOSCH_D_CAN:
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priv->regs = reg_map_d_can;
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priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
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priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
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priv->write_reg = c_can_plat_write_reg_aligned_to_16bit;
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if (pdev->dev.of_node)
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priv->instance = of_alias_get_id(pdev->dev.of_node, "d_can");
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else
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priv->instance = pdev->id;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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priv->raminit_ctrlreg = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->raminit_ctrlreg) || (int)priv->instance < 0)
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dev_info(&pdev->dev, "control memory is not used for raminit\n");
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else
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priv->raminit = c_can_hw_raminit;
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break;
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default:
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ret = -EINVAL;
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goto exit_free_device;
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}
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dev->irq = irq;
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priv->base = addr;
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priv->device = &pdev->dev;
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priv->can.clock.freq = clk_get_rate(clk);
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priv->priv = clk;
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priv->type = id->driver_data;
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platform_set_drvdata(pdev, dev);
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SET_NETDEV_DEV(dev, &pdev->dev);
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ret = register_c_can_dev(dev);
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if (ret) {
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dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
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KBUILD_MODNAME, ret);
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goto exit_free_device;
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}
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dev_info(&pdev->dev, "%s device registered (regs=%p, irq=%d)\n",
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KBUILD_MODNAME, priv->base, dev->irq);
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return 0;
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exit_free_device:
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free_c_can_dev(dev);
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exit_iounmap:
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iounmap(addr);
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exit_release_mem:
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release_mem_region(mem->start, resource_size(mem));
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exit_free_clk:
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clk_put(clk);
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exit:
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dev_err(&pdev->dev, "probe failed\n");
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return ret;
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}
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static int c_can_plat_remove(struct platform_device *pdev)
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{
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struct net_device *dev = platform_get_drvdata(pdev);
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struct c_can_priv *priv = netdev_priv(dev);
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struct resource *mem;
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unregister_c_can_dev(dev);
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free_c_can_dev(dev);
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iounmap(priv->base);
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(mem->start, resource_size(mem));
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clk_put(priv->priv);
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return 0;
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}
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#ifdef CONFIG_PM
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static int c_can_suspend(struct platform_device *pdev, pm_message_t state)
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{
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int ret;
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struct net_device *ndev = platform_get_drvdata(pdev);
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struct c_can_priv *priv = netdev_priv(ndev);
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if (priv->type != BOSCH_D_CAN) {
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dev_warn(&pdev->dev, "Not supported\n");
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return 0;
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}
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if (netif_running(ndev)) {
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netif_stop_queue(ndev);
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netif_device_detach(ndev);
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}
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ret = c_can_power_down(ndev);
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if (ret) {
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netdev_err(ndev, "failed to enter power down mode\n");
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return ret;
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}
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priv->can.state = CAN_STATE_SLEEPING;
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return 0;
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}
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static int c_can_resume(struct platform_device *pdev)
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{
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int ret;
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struct net_device *ndev = platform_get_drvdata(pdev);
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struct c_can_priv *priv = netdev_priv(ndev);
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if (priv->type != BOSCH_D_CAN) {
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dev_warn(&pdev->dev, "Not supported\n");
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return 0;
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}
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ret = c_can_power_up(ndev);
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if (ret) {
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netdev_err(ndev, "Still in power down mode\n");
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return ret;
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}
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priv->can.state = CAN_STATE_ERROR_ACTIVE;
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if (netif_running(ndev)) {
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netif_device_attach(ndev);
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netif_start_queue(ndev);
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}
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return 0;
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}
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#else
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#define c_can_suspend NULL
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#define c_can_resume NULL
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#endif
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static struct platform_driver c_can_plat_driver = {
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.driver = {
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.name = KBUILD_MODNAME,
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(c_can_of_table),
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},
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.probe = c_can_plat_probe,
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.remove = c_can_plat_remove,
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.suspend = c_can_suspend,
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.resume = c_can_resume,
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.id_table = c_can_id_table,
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};
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module_platform_driver(c_can_plat_driver);
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MODULE_AUTHOR("Bhupesh Sharma <bhupesh.sharma@st.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Platform CAN bus driver for Bosch C_CAN controller");
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