[PATCH v3 5/5] can: flexcan: add mcf5441x support

Angelo Dureghello
2021-06-21T18:47:27Z

Add flexcan support for NXP ColdFire mcf5441x family.

This flexcan module is quite similar to imx6 flexcan module, but
with some exceptions:

- 3 separate interrupt sources, MB, BOFF and ERR,
- implements 16 mb only,
- m68k architecture is not supporting devicetrees, so a
platform data check/case has been added,
- ColdFire is m68k, so big-endian cpu, with a little-endian flexcan
module.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
Changes for v2:
- re-add platform data handling restarting from 2c0ac9208135
- re-add flexcan_id_table, as from 2c0ac9208135
- usinig irq resources for ERR and BOFF interrupts
- add missing free_irq() for interrupts
- minor syntax fixes
Changes for v3:
- change platform data include name
- add mcf5441x to hw feature flags
- add mb column to hw feature flags
- fix irq free order
- add proper error handlings
- remove unrelated changes
- split quirk in mb_n and irq_n quirks
---
drivers/net/can/flexcan.c | 126 ++++++++++++++++++++++++++++++++------
1 file changed, 106 insertions(+), 20 deletions(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 57f3635ad8d7..123737be2d6b 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -28,6 +28,7 @@
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
+#include <linux/can/platform/flexcan.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
@@ -208,18 +209,19 @@
/* FLEXCAN hardware feature flags
*
* Below is some version info we got:
- * SOC Version IP-Version Glitch- [TR]WRN_INT IRQ Err Memory err RTR rece- FD Mode
+ * SOC Version IP-Version Glitch- [TR]WRN_INT IRQ Err Memory err RTR rece- FD Mode MB
* Filter? connected? Passive detection ption in MB Supported?
- * MX25 FlexCAN2 03.00.00.00 no no no no no no
- * MX28 FlexCAN2 03.00.04.00 yes yes no no no no
- * MX35 FlexCAN2 03.00.00.00 no no no no no no
- * MX53 FlexCAN2 03.00.00.00 yes no no no no no
- * MX6s FlexCAN3 10.00.12.00 yes yes no no yes no
- * MX8QM FlexCAN3 03.00.23.00 yes yes no no yes yes
- * MX8MP FlexCAN3 03.00.17.01 yes yes no yes yes yes
- * VF610 FlexCAN3 ? no yes no yes yes? no
- * LS1021A FlexCAN2 03.00.04.00 no yes no no yes no
- * LX2160A FlexCAN3 03.00.23.00 no yes no yes yes yes
+ * MX25 FlexCAN2 03.00.00.00 no no no no no no 64
+ * MX28 FlexCAN2 03.00.04.00 yes yes no no no no 64
+ * MX35 FlexCAN2 03.00.00.00 no no no no no no 64
+ * MX53 FlexCAN2 03.00.00.00 yes no no no no no 64
+ * MX6s FlexCAN3 10.00.12.00 yes yes no no yes no 64
+ * MX8QM FlexCAN3 03.00.23.00 yes yes no no yes yes 64
+ * MX8MP FlexCAN3 03.00.17.01 yes yes no yes yes yes 64
+ * VF610 FlexCAN3 ? no yes no yes yes? no 64
+ * LS1021A FlexCAN2 03.00.04.00 no yes no no yes no 64
+ * LX2160A FlexCAN3 03.00.23.00 no yes no yes yes yes 64
+ * MCF5441X FlexCAN2 ? no yes no no yes no 16
*
* Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected.
*/
@@ -246,6 +248,10 @@
#define FLEXCAN_QUIRK_SUPPORT_ECC BIT(10)
/* Setup stop mode with SCU firmware to support wakeup */
#define FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW BIT(11)
+/* Setup 3 separate interrupts, main, boff and err */
+#define FLEXCAN_QUIRK_NR_IRQ_3 BIT(12)
+/* Setup 16 mailboxes */
+#define FLEXCAN_QUIRK_NR_MB_16 BIT(13)

/* Structure of the message buffer */
struct flexcan_mb {
@@ -363,6 +369,9 @@ struct flexcan_priv {
struct regulator *reg_xceiver;
struct flexcan_stop_mode stm;

+ int irq_boff;
+ int irq_err;
+
/* IPC handle when setup stop mode by System Controller firmware(scfw) */
struct imx_sc_ipc *sc_ipc_handle;

@@ -371,6 +380,11 @@ struct flexcan_priv {
void (*write)(u32 val, void __iomem *addr);
};

+static const struct flexcan_devtype_data fsl_mcf5441x_devtype_data = {
+ .quirks = FLEXCAN_QUIRK_BROKEN_PERR_STATE |
+ FLEXCAN_QUIRK_NR_IRQ_3 | FLEXCAN_QUIRK_NR_MB_16,
+};
+
static const struct flexcan_devtype_data fsl_p1010_devtype_data = {
.quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE |
FLEXCAN_QUIRK_BROKEN_PERR_STATE |
@@ -637,13 +651,17 @@ static int flexcan_clks_enable(const struct flexcan_priv *priv)
{
int err;

- err = clk_prepare_enable(priv->clk_ipg);
- if (err)
- return err;
+ if (priv->clk_ipg) {
+ err = clk_prepare_enable(priv->clk_ipg);
+ if (err)
+ return err;
+ }

- err = clk_prepare_enable(priv->clk_per);
- if (err)
- clk_disable_unprepare(priv->clk_ipg);
+ if (priv->clk_per) {
+ err = clk_prepare_enable(priv->clk_per);
+ if (err)
+ clk_disable_unprepare(priv->clk_ipg);
+ }

return err;
}
@@ -1401,8 +1419,12 @@ static int flexcan_rx_offload_setup(struct net_device *dev)
priv->mb_size = sizeof(struct flexcan_mb) + CANFD_MAX_DLEN;
else
priv->mb_size = sizeof(struct flexcan_mb) + CAN_MAX_DLEN;
- priv->mb_count = (sizeof(priv->regs->mb[0]) / priv->mb_size) +
- (sizeof(priv->regs->mb[1]) / priv->mb_size);
+
+ if (priv->devtype_data->quirks & FLEXCAN_QUIRK_NR_MB_16)
+ priv->mb_count = FLEXCAN_MCF5411X_MB_CNT_MCF;
+ else
+ priv->mb_count = (sizeof(priv->regs->mb[0]) / priv->mb_size) +
+ (sizeof(priv->regs->mb[1]) / priv->mb_size);

if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP)
priv->tx_mb_reserved =
@@ -1774,6 +1796,18 @@ static int flexcan_open(struct net_device *dev)
if (err)
goto out_can_rx_offload_disable;

+ if (priv->devtype_data->quirks & FLEXCAN_QUIRK_NR_IRQ_3) {
+ err = request_irq(priv->irq_boff,
+ flexcan_irq, IRQF_SHARED, dev->name, dev);
+ if (err)
+ goto out_can_irq_disable;
+
+ err = request_irq(priv->irq_err,
+ flexcan_irq, IRQF_SHARED, dev->name, dev);
+ if (err)
+ goto out_can_irq_boff_disable;
+ }
+
flexcan_chip_interrupts_enable(dev);

can_led_event(dev, CAN_LED_EVENT_OPEN);
@@ -1782,6 +1816,10 @@ static int flexcan_open(struct net_device *dev)

return 0;

+ out_can_irq_boff_disable:
+ free_irq(priv->irq_boff, dev);
+ out_can_irq_disable:
+ free_irq(dev->irq, dev);
out_can_rx_offload_disable:
can_rx_offload_disable(&priv->offload);
flexcan_chip_stop(dev);
@@ -1803,6 +1841,12 @@ static int flexcan_close(struct net_device *dev)

netif_stop_queue(dev);
flexcan_chip_interrupts_disable(dev);
+
+ if (priv->devtype_data->quirks & FLEXCAN_QUIRK_NR_IRQ_3) {
+ free_irq(priv->irq_err, dev);
+ free_irq(priv->irq_boff, dev);
+ }
+
free_irq(dev->irq, dev);
can_rx_offload_disable(&priv->offload);
flexcan_chip_stop_disable_on_error(dev);
@@ -2039,14 +2083,26 @@ static const struct of_device_id flexcan_of_match[] = {
};
MODULE_DEVICE_TABLE(of, flexcan_of_match);

+static const struct platform_device_id flexcan_id_table[] = {
+ {
+ .name = "flexcan-mcf5441x",
+ .driver_data = (kernel_ulong_t)&fsl_mcf5441x_devtype_data,
+ }, {
+ /* sentinel */
+ },
+};
+MODULE_DEVICE_TABLE(platform, flexcan_id_table);
+
static int flexcan_probe(struct platform_device *pdev)
{
+ const struct of_device_id *of_id;
const struct flexcan_devtype_data *devtype_data;
struct net_device *dev;
struct flexcan_priv *priv;
struct regulator *reg_xceiver;
struct clk *clk_ipg = NULL, *clk_per = NULL;
struct flexcan_regs __iomem *regs;
+ struct mcf_flexcan_platform_data *pdata;
int err, irq;
u8 clk_src = 1;
u32 clock_freq = 0;
@@ -2064,6 +2120,12 @@ static int flexcan_probe(struct platform_device *pdev)
"clock-frequency", &clock_freq);
of_property_read_u8(pdev->dev.of_node,
"fsl,clk-source", &clk_src);
+ } else {
+ pdata = dev_get_platdata(&pdev->dev);
+ if (pdata) {
+ clock_freq = pdata->clock_frequency;
+ clk_src = pdata->clk_src;
+ }
}

if (!clock_freq) {
@@ -2089,7 +2151,14 @@ static int flexcan_probe(struct platform_device *pdev)
if (IS_ERR(regs))
return PTR_ERR(regs);

- devtype_data = of_device_get_match_data(&pdev->dev);
+ of_id = of_match_device(flexcan_of_match, &pdev->dev);
+ if (of_id)
+ devtype_data = of_id->data;
+ else if (platform_get_device_id(pdev)->driver_data)
+ devtype_data = (struct flexcan_devtype_data *)
+ platform_get_device_id(pdev)->driver_data;
+ else
+ return -ENODEV;

if ((devtype_data->quirks & FLEXCAN_QUIRK_SUPPORT_FD) &&
!(devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP)) {
@@ -2133,6 +2202,19 @@ static int flexcan_probe(struct platform_device *pdev)
priv->devtype_data = devtype_data;
priv->reg_xceiver = reg_xceiver;

+ if (devtype_data->quirks & FLEXCAN_QUIRK_NR_IRQ_3) {
+ priv->irq_boff = platform_get_irq(pdev, 1);
+ if (priv->irq_boff <= 0) {
+ err = -ENODEV;
+ goto failed_get_irq_boff;
+ }
+ priv->irq_err = platform_get_irq(pdev, 2);
+ if (priv->irq_err <= 0) {
+ err = -ENODEV;
+ goto failed_get_irq_err;
+ }
+ }
+
if (priv->devtype_data->quirks & FLEXCAN_QUIRK_SUPPORT_FD) {
priv->can.ctrlmode_supported |= CAN_CTRLMODE_FD |
CAN_CTRLMODE_FD_NON_ISO;
@@ -2170,6 +2252,9 @@ static int flexcan_probe(struct platform_device *pdev)
failed_register:
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
+ failed_get_irq_err:
+ free_irq(priv->irq_boff, dev);
+ failed_get_irq_boff:
free_candev(dev);
return err;
}
@@ -2322,6 +2407,7 @@ static struct platform_driver flexcan_driver = {
},
.probe = flexcan_probe,
.remove = flexcan_remove,
+ .id_table = flexcan_id_table,
};

module_platform_driver(flexcan_driver);
--
2.31.1