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Diffstat (limited to 'drivers/net/can/c_can')
-rw-r--r--drivers/net/can/c_can/c_can.c130
-rw-r--r--drivers/net/can/c_can/c_can.h14
-rw-r--r--drivers/net/can/c_can/c_can_pci.c6
-rw-r--r--drivers/net/can/c_can/c_can_platform.c123
4 files changed, 248 insertions, 25 deletions
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 4c538e38865..e5180dfddba 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -34,6 +34,7 @@
#include <linux/if_ether.h>
#include <linux/list.h>
#include <linux/io.h>
+#include <linux/pm_runtime.h>
#include <linux/can.h>
#include <linux/can/dev.h>
@@ -45,6 +46,9 @@
#define IF_ENUM_REG_LEN 11
#define C_CAN_IFACE(reg, iface) (C_CAN_IF1_##reg + (iface) * IF_ENUM_REG_LEN)
+/* control extension register D_CAN specific */
+#define CONTROL_EX_PDR BIT(8)
+
/* control register */
#define CONTROL_TEST BIT(7)
#define CONTROL_CCE BIT(6)
@@ -64,6 +68,7 @@
#define TEST_BASIC BIT(2)
/* status register */
+#define STATUS_PDA BIT(10)
#define STATUS_BOFF BIT(7)
#define STATUS_EWARN BIT(6)
#define STATUS_EPASS BIT(5)
@@ -163,6 +168,9 @@
/* minimum timeout for checking BUSY status */
#define MIN_TIMEOUT_VALUE 6
+/* Wait for ~1 sec for INIT bit */
+#define INIT_WAIT_MS 1000
+
/* napi related */
#define C_CAN_NAPI_WEIGHT C_CAN_MSG_OBJ_RX_NUM
@@ -201,6 +209,30 @@ static const struct can_bittiming_const c_can_bittiming_const = {
.brp_inc = 1,
};
+static inline void c_can_pm_runtime_enable(const struct c_can_priv *priv)
+{
+ if (priv->device)
+ pm_runtime_enable(priv->device);
+}
+
+static inline void c_can_pm_runtime_disable(const struct c_can_priv *priv)
+{
+ if (priv->device)
+ pm_runtime_disable(priv->device);
+}
+
+static inline void c_can_pm_runtime_get_sync(const struct c_can_priv *priv)
+{
+ if (priv->device)
+ pm_runtime_get_sync(priv->device);
+}
+
+static inline void c_can_pm_runtime_put_sync(const struct c_can_priv *priv)
+{
+ if (priv->device)
+ pm_runtime_put_sync(priv->device);
+}
+
static inline int get_tx_next_msg_obj(const struct c_can_priv *priv)
{
return (priv->tx_next & C_CAN_NEXT_MSG_OBJ_MASK) +
@@ -673,11 +705,15 @@ static int c_can_get_berr_counter(const struct net_device *dev,
unsigned int reg_err_counter;
struct c_can_priv *priv = netdev_priv(dev);
+ c_can_pm_runtime_get_sync(priv);
+
reg_err_counter = priv->read_reg(priv, C_CAN_ERR_CNT_REG);
bec->rxerr = (reg_err_counter & ERR_CNT_REC_MASK) >>
ERR_CNT_REC_SHIFT;
bec->txerr = reg_err_counter & ERR_CNT_TEC_MASK;
+ c_can_pm_runtime_put_sync(priv);
+
return 0;
}
@@ -1053,11 +1089,13 @@ static int c_can_open(struct net_device *dev)
int err;
struct c_can_priv *priv = netdev_priv(dev);
+ c_can_pm_runtime_get_sync(priv);
+
/* open the can device */
err = open_candev(dev);
if (err) {
netdev_err(dev, "failed to open can device\n");
- return err;
+ goto exit_open_fail;
}
/* register interrupt handler */
@@ -1079,6 +1117,8 @@ static int c_can_open(struct net_device *dev)
exit_irq_fail:
close_candev(dev);
+exit_open_fail:
+ c_can_pm_runtime_put_sync(priv);
return err;
}
@@ -1091,6 +1131,7 @@ static int c_can_close(struct net_device *dev)
c_can_stop(dev);
free_irq(dev->irq, dev);
close_candev(dev);
+ c_can_pm_runtime_put_sync(priv);
return 0;
}
@@ -1119,6 +1160,77 @@ struct net_device *alloc_c_can_dev(void)
}
EXPORT_SYMBOL_GPL(alloc_c_can_dev);
+#ifdef CONFIG_PM
+int c_can_power_down(struct net_device *dev)
+{
+ u32 val;
+ unsigned long time_out;
+ struct c_can_priv *priv = netdev_priv(dev);
+
+ if (!(dev->flags & IFF_UP))
+ return 0;
+
+ WARN_ON(priv->type != BOSCH_D_CAN);
+
+ /* set PDR value so the device goes to power down mode */
+ val = priv->read_reg(priv, C_CAN_CTRL_EX_REG);
+ val |= CONTROL_EX_PDR;
+ priv->write_reg(priv, C_CAN_CTRL_EX_REG, val);
+
+ /* Wait for the PDA bit to get set */
+ time_out = jiffies + msecs_to_jiffies(INIT_WAIT_MS);
+ while (!(priv->read_reg(priv, C_CAN_STS_REG) & STATUS_PDA) &&
+ time_after(time_out, jiffies))
+ cpu_relax();
+
+ if (time_after(jiffies, time_out))
+ return -ETIMEDOUT;
+
+ c_can_stop(dev);
+
+ c_can_pm_runtime_put_sync(priv);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(c_can_power_down);
+
+int c_can_power_up(struct net_device *dev)
+{
+ u32 val;
+ unsigned long time_out;
+ struct c_can_priv *priv = netdev_priv(dev);
+
+ if (!(dev->flags & IFF_UP))
+ return 0;
+
+ WARN_ON(priv->type != BOSCH_D_CAN);
+
+ c_can_pm_runtime_get_sync(priv);
+
+ /* Clear PDR and INIT bits */
+ val = priv->read_reg(priv, C_CAN_CTRL_EX_REG);
+ val &= ~CONTROL_EX_PDR;
+ priv->write_reg(priv, C_CAN_CTRL_EX_REG, val);
+ val = priv->read_reg(priv, C_CAN_CTRL_REG);
+ val &= ~CONTROL_INIT;
+ priv->write_reg(priv, C_CAN_CTRL_REG, val);
+
+ /* Wait for the PDA bit to get clear */
+ time_out = jiffies + msecs_to_jiffies(INIT_WAIT_MS);
+ while ((priv->read_reg(priv, C_CAN_STS_REG) & STATUS_PDA) &&
+ time_after(time_out, jiffies))
+ cpu_relax();
+
+ if (time_after(jiffies, time_out))
+ return -ETIMEDOUT;
+
+ c_can_start(dev);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(c_can_power_up);
+#endif
+
void free_c_can_dev(struct net_device *dev)
{
free_candev(dev);
@@ -1133,10 +1245,19 @@ static const struct net_device_ops c_can_netdev_ops = {
int register_c_can_dev(struct net_device *dev)
{
+ struct c_can_priv *priv = netdev_priv(dev);
+ int err;
+
+ c_can_pm_runtime_enable(priv);
+
dev->flags |= IFF_ECHO; /* we support local echo */
dev->netdev_ops = &c_can_netdev_ops;
- return register_candev(dev);
+ err = register_candev(dev);
+ if (err)
+ c_can_pm_runtime_disable(priv);
+
+ return err;
}
EXPORT_SYMBOL_GPL(register_c_can_dev);
@@ -1144,10 +1265,9 @@ void unregister_c_can_dev(struct net_device *dev)
{
struct c_can_priv *priv = netdev_priv(dev);
- /* disable all interrupts */
- c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
-
unregister_candev(dev);
+
+ c_can_pm_runtime_disable(priv);
}
EXPORT_SYMBOL_GPL(unregister_c_can_dev);
diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index 01a7049ab99..e5ed41dafa1 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -24,6 +24,7 @@
enum reg {
C_CAN_CTRL_REG = 0,
+ C_CAN_CTRL_EX_REG,
C_CAN_STS_REG,
C_CAN_ERR_CNT_REG,
C_CAN_BTR_REG,
@@ -104,6 +105,7 @@ static const u16 reg_map_c_can[] = {
static const u16 reg_map_d_can[] = {
[C_CAN_CTRL_REG] = 0x00,
+ [C_CAN_CTRL_EX_REG] = 0x02,
[C_CAN_STS_REG] = 0x04,
[C_CAN_ERR_CNT_REG] = 0x08,
[C_CAN_BTR_REG] = 0x0C,
@@ -143,8 +145,9 @@ static const u16 reg_map_d_can[] = {
};
enum c_can_dev_id {
- C_CAN_DEVTYPE,
- D_CAN_DEVTYPE,
+ BOSCH_C_CAN_PLATFORM,
+ BOSCH_C_CAN,
+ BOSCH_D_CAN,
};
/* c_can private data structure */
@@ -152,6 +155,7 @@ struct c_can_priv {
struct can_priv can; /* must be the first member */
struct napi_struct napi;
struct net_device *dev;
+ struct device *device;
int tx_object;
int current_status;
int last_status;
@@ -164,6 +168,7 @@ struct c_can_priv {
unsigned int tx_echo;
void *priv; /* for board-specific data */
u16 irqstatus;
+ enum c_can_dev_id type;
};
struct net_device *alloc_c_can_dev(void);
@@ -171,4 +176,9 @@ void free_c_can_dev(struct net_device *dev);
int register_c_can_dev(struct net_device *dev);
void unregister_c_can_dev(struct net_device *dev);
+#ifdef CONFIG_PM
+int c_can_power_up(struct net_device *dev);
+int c_can_power_down(struct net_device *dev);
+#endif
+
#endif /* C_CAN_H */
diff --git a/drivers/net/can/c_can/c_can_pci.c b/drivers/net/can/c_can/c_can_pci.c
index 1011146ea51..3d7830bcd2b 100644
--- a/drivers/net/can/c_can/c_can_pci.c
+++ b/drivers/net/can/c_can/c_can_pci.c
@@ -120,10 +120,10 @@ static int __devinit c_can_pci_probe(struct pci_dev *pdev,
/* Configure CAN type */
switch (c_can_pci_data->type) {
- case C_CAN_DEVTYPE:
+ case BOSCH_C_CAN:
priv->regs = reg_map_c_can;
break;
- case D_CAN_DEVTYPE:
+ case BOSCH_D_CAN:
priv->regs = reg_map_d_can;
priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
break;
@@ -192,7 +192,7 @@ static void __devexit c_can_pci_remove(struct pci_dev *pdev)
}
static struct c_can_pci_data c_can_sta2x11= {
- .type = C_CAN_DEVTYPE,
+ .type = BOSCH_C_CAN,
.reg_align = C_CAN_REG_ALIGN_32,
.freq = 52000000, /* 52 Mhz */
};
diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index 6ff7ad006c3..ee1416132ab 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -30,6 +30,9 @@
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
#include <linux/can/dev.h>
@@ -65,17 +68,58 @@ static void c_can_plat_write_reg_aligned_to_32bit(struct c_can_priv *priv,
writew(val, priv->base + 2 * priv->regs[index]);
}
+static struct platform_device_id c_can_id_table[] = {
+ [BOSCH_C_CAN_PLATFORM] = {
+ .name = KBUILD_MODNAME,
+ .driver_data = BOSCH_C_CAN,
+ },
+ [BOSCH_C_CAN] = {
+ .name = "c_can",
+ .driver_data = BOSCH_C_CAN,
+ },
+ [BOSCH_D_CAN] = {
+ .name = "d_can",
+ .driver_data = BOSCH_D_CAN,
+ }, {
+ }
+};
+
+static const struct of_device_id c_can_of_table[] = {
+ { .compatible = "bosch,c_can", .data = &c_can_id_table[BOSCH_C_CAN] },
+ { .compatible = "bosch,d_can", .data = &c_can_id_table[BOSCH_D_CAN] },
+ { /* sentinel */ },
+};
+
static int __devinit c_can_plat_probe(struct platform_device *pdev)
{
int ret;
void __iomem *addr;
struct net_device *dev;
struct c_can_priv *priv;
+ const struct of_device_id *match;
const struct platform_device_id *id;
+ struct pinctrl *pinctrl;
struct resource *mem;
int irq;
struct clk *clk;
+ if (pdev->dev.of_node) {
+ match = of_match_device(c_can_of_table, &pdev->dev);
+ if (!match) {
+ dev_err(&pdev->dev, "Failed to find matching dt id\n");
+ ret = -EINVAL;
+ goto exit;
+ }
+ id = match->data;
+ } else {
+ id = platform_get_device_id(pdev);
+ }
+
+ pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
+ if (IS_ERR(pinctrl))
+ dev_warn(&pdev->dev,
+ "failed to configure pins from driver\n");
+
/* get the appropriate clk */
clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
@@ -114,9 +158,8 @@ static int __devinit c_can_plat_probe(struct platform_device *pdev)
}
priv = netdev_priv(dev);
- id = platform_get_device_id(pdev);
switch (id->driver_data) {
- case C_CAN_DEVTYPE:
+ case BOSCH_C_CAN:
priv->regs = reg_map_c_can;
switch (mem->flags & IORESOURCE_MEM_TYPE_MASK) {
case IORESOURCE_MEM_32BIT:
@@ -130,7 +173,7 @@ static int __devinit c_can_plat_probe(struct platform_device *pdev)
break;
}
break;
- case D_CAN_DEVTYPE:
+ case BOSCH_D_CAN:
priv->regs = reg_map_d_can;
priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
@@ -143,8 +186,10 @@ static int __devinit c_can_plat_probe(struct platform_device *pdev)
dev->irq = irq;
priv->base = addr;
+ priv->device = &pdev->dev;
priv->can.clock.freq = clk_get_rate(clk);
priv->priv = clk;
+ priv->type = id->driver_data;
platform_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);
@@ -195,27 +240,75 @@ static int __devexit c_can_plat_remove(struct platform_device *pdev)
return 0;
}
-static const struct platform_device_id c_can_id_table[] = {
- {
- .name = KBUILD_MODNAME,
- .driver_data = C_CAN_DEVTYPE,
- }, {
- .name = "c_can",
- .driver_data = C_CAN_DEVTYPE,
- }, {
- .name = "d_can",
- .driver_data = D_CAN_DEVTYPE,
- }, {
+#ifdef CONFIG_PM
+static int c_can_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ int ret;
+ struct net_device *ndev = platform_get_drvdata(pdev);
+ struct c_can_priv *priv = netdev_priv(ndev);
+
+ if (priv->type != BOSCH_D_CAN) {
+ dev_warn(&pdev->dev, "Not supported\n");
+ return 0;
}
-};
+
+ if (netif_running(ndev)) {
+ netif_stop_queue(ndev);
+ netif_device_detach(ndev);
+ }
+
+ ret = c_can_power_down(ndev);
+ if (ret) {
+ netdev_err(ndev, "failed to enter power down mode\n");
+ return ret;
+ }
+
+ priv->can.state = CAN_STATE_SLEEPING;
+
+ return 0;
+}
+
+static int c_can_resume(struct platform_device *pdev)
+{
+ int ret;
+ struct net_device *ndev = platform_get_drvdata(pdev);
+ struct c_can_priv *priv = netdev_priv(ndev);
+
+ if (priv->type != BOSCH_D_CAN) {
+ dev_warn(&pdev->dev, "Not supported\n");
+ return 0;
+ }
+
+ ret = c_can_power_up(ndev);
+ if (ret) {
+ netdev_err(ndev, "Still in power down mode\n");
+ return ret;
+ }
+
+ priv->can.state = CAN_STATE_ERROR_ACTIVE;
+
+ if (netif_running(ndev)) {
+ netif_device_attach(ndev);
+ netif_start_queue(ndev);
+ }
+
+ return 0;
+}
+#else
+#define c_can_suspend NULL
+#define c_can_resume NULL
+#endif
static struct platform_driver c_can_plat_driver = {
.driver = {
.name = KBUILD_MODNAME,
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(c_can_of_table),
},
.probe = c_can_plat_probe,
.remove = __devexit_p(c_can_plat_remove),
+ .suspend = c_can_suspend,
+ .resume = c_can_resume,
.id_table = c_can_id_table,
};
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-18 21:51:51 +0000