Re: [PATCH 3/5] m68k: m5441x: add flexcan support

[Greg Ungerer <gerg@linux-m68k.org>]

Hi Angelo,

On 9/6/21 6:45 am, Angelo Dureghello wrote:
> Add flexcan support.
> 
> Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
> ---
>   arch/m68k/coldfire/device.c       | 31 +++++++++++++++++++++++++++++++
>   arch/m68k/coldfire/m5441x.c       |  8 ++++----
>   arch/m68k/include/asm/m5441xsim.h | 19 +++++++++++++++++++
>   3 files changed, 54 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/m68k/coldfire/device.c b/arch/m68k/coldfire/device.c
> index 59f7dfe50a4d..b3263283bf71 100644
> --- a/arch/m68k/coldfire/device.c
> +++ b/arch/m68k/coldfire/device.c
> @@ -23,6 +23,7 @@
>   #include <linux/platform_data/edma.h>
>   #include <linux/platform_data/dma-mcf-edma.h>
>   #include <linux/platform_data/mmc-esdhc-mcf.h>
> +#include <linux/platform_data/flexcan-mcf.h>
>   
>   /*
>    *	All current ColdFire parts contain from 2, 3, 4 or 10 UARTS.
> @@ -581,6 +582,33 @@ static struct platform_device mcf_esdhc = {
>   };
>   #endif /* MCFSDHC_BASE */
>   
> +#if IS_ENABLED(CONFIG_CAN)
> +static struct mcf_flexcan_platform_data mcf_flexcan_info = {
> +	.clk_src = 1,
> +	.clock_frequency = 120000000,
> +};
> +
> +static struct resource mcf_flexcan0_resource[] = {
> +	{
> +		.start = MCFFLEXCAN_BASE0,
> +		.end = MCFFLEXCAN_BASE0 + MCFFLEXCAN_SIZE,
> +		.flags = IORESOURCE_MEM,
> +	}, {
> +		.start = MCF_IRQ_IFL0,
> +		.end = MCF_IRQ_ERR0,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct platform_device mcf_flexcan0 = {
> +	.name = "flexcan",
> +	.id = 0,
> +	.num_resources = ARRAY_SIZE(mcf_flexcan0_resource),
> +	.resource = mcf_flexcan0_resource,
> +	.dev.platform_data = &mcf_flexcan_info,
> +};
> +#endif /* IS_ENABLED(CONFIG_CAN) */
> +
>   static struct platform_device *mcf_devices[] __initdata = {
>   	&mcf_uart,
>   #if IS_ENABLED(CONFIG_FEC)
> @@ -616,6 +644,9 @@ static struct platform_device *mcf_devices[] __initdata = {
>   #ifdef MCFSDHC_BASE
>   	&mcf_esdhc,
>   #endif
> +#if IS_ENABLED(CONFIG_CAN)
> +	&mcf_flexcan0,
> +#endif
>   };
>   
>   /*
> diff --git a/arch/m68k/coldfire/m5441x.c b/arch/m68k/coldfire/m5441x.c
> index 1e5259a652d1..18b152edb69c 100644
> --- a/arch/m68k/coldfire/m5441x.c
> +++ b/arch/m68k/coldfire/m5441x.c
> @@ -18,8 +18,8 @@
>   #include <asm/mcfclk.h>
>   
>   DEFINE_CLK(0, "flexbus", 2, MCF_CLK);
> -DEFINE_CLK(0, "mcfcan.0", 8, MCF_CLK);
> -DEFINE_CLK(0, "mcfcan.1", 9, MCF_CLK);
> +DEFINE_CLK(0, "flexcan.0", 8, MCF_CLK);
> +DEFINE_CLK(0, "flexcan.1", 9, MCF_CLK);
>   DEFINE_CLK(0, "imx1-i2c.1", 14, MCF_CLK);

Just a heads up, but this will likely conflict with Arnd's clock changes, see:

     https://lkml.org/lkml/2021/6/8/774

Regards
Greg


>   DEFINE_CLK(0, "mcfdspi.1", 15, MCF_CLK);
>   DEFINE_CLK(0, "edma", 17, MCF_CLK);
> @@ -146,6 +146,8 @@ struct clk *mcf_clks[] = {
>   
>   static struct clk * const enable_clks[] __initconst = {
>   	/* make sure these clocks are enabled */
> +	&__clk_0_8, /* flexcan.0 */
> +	&__clk_0_9, /* flexcan.1 */
>   	&__clk_0_15, /* dspi.1 */
>   	&__clk_0_17, /* eDMA */
>   	&__clk_0_18, /* intc0 */
> @@ -166,8 +168,6 @@ static struct clk * const enable_clks[] __initconst = {
>   	&__clk_1_37, /* gpio */
>   };
>   static struct clk * const disable_clks[] __initconst = {
> -	&__clk_0_8, /* can.0 */
> -	&__clk_0_9, /* can.1 */
>   	&__clk_0_14, /* i2c.1 */
>   	&__clk_0_22, /* i2c.0 */
>   	&__clk_0_23, /* dspi.0 */
> diff --git a/arch/m68k/include/asm/m5441xsim.h b/arch/m68k/include/asm/m5441xsim.h
> index e091e36d3464..f48cf63bd782 100644
> --- a/arch/m68k/include/asm/m5441xsim.h
> +++ b/arch/m68k/include/asm/m5441xsim.h
> @@ -73,6 +73,12 @@
>   #define MCFINT0_FECENTC1	55
>   
>   /* on interrupt controller 1 */
> +#define MCFINT1_FLEXCAN0_IFL	0
> +#define MCFINT1_FLEXCAN0_BOFF	1
> +#define MCFINT1_FLEXCAN0_ERR	3
> +#define MCFINT1_FLEXCAN1_IFL	4
> +#define MCFINT1_FLEXCAN1_BOFF	5
> +#define MCFINT1_FLEXCAN1_ERR	7
>   #define MCFINT1_UART4		48
>   #define MCFINT1_UART5		49
>   #define MCFINT1_UART6		50
> @@ -314,4 +320,17 @@
>   #define MCF_IRQ_SDHC		(MCFINT2_VECBASE + MCFINT2_SDHC)
>   #define MCFSDHC_CLK		(MCFSDHC_BASE + 0x2c)
>   
> +/*
> + * Flexcan module
> + */
> +#define MCFFLEXCAN_BASE0	0xfc020000
> +#define MCFFLEXCAN_BASE1	0xfc024000
> +#define MCFFLEXCAN_SIZE		0x4000
> +#define MCF_IRQ_IFL0		(MCFINT1_VECBASE + MCFINT1_FLEXCAN0_IFL)
> +#define MCF_IRQ_BOFF0		(MCFINT1_VECBASE + MCFINT1_FLEXCAN0_BOFF)
> +#define MCF_IRQ_ERR0		(MCFINT1_VECBASE + MCFINT1_FLEXCAN0_ERR)
> +#define MCF_IRQ_IFL1		(MCFINT1_VECBASE + MCFINT1_FLEXCAN1_IFL)
> +#define MCF_IRQ_BOFF1		(MCFINT1_VECBASE + MCFINT1_FLEXCAN1_BOFF)
> +#define MCF_IRQ_ERR1		(MCFINT1_VECBASE + MCFINT1_FLEXCAN1_ERR)
> +
>   #endif /* m5441xsim_h */
>