Subject: [PATCH v5 7/9] ARM: davinci: Remoteproc platform device creation data/code

From: [email-masked] (Sekhar Nori)
Date: Mon, 21 Jan 2013 14:04:17 +0530

On 1/11/2013 5:53 AM, Robert Tivy wrote:
> Added a new remoteproc platform device for DA8XX.  Contains CMA-based
> reservation of physical memory block.  A new kernel command-line
> parameter has been added to allow boot-time specification of the
> physical memory block.
> 
> Signed-off-by: Robert Tivy <[email-masked]>
> ---
>  Documentation/kernel-parameters.txt        |    7 +++
>  arch/arm/mach-davinci/devices-da8xx.c      |   93 +++++++++++++++++++++++++++-
>  arch/arm/mach-davinci/include/mach/da8xx.h |    4 ++
>  3 files changed, 103 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 363e348..e95afb1 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -44,6 +44,7 @@ parameter is applicable:
>  	AVR32	AVR32 architecture is enabled.
>  	AX25	Appropriate AX.25 support is enabled.
>  	BLACKFIN Blackfin architecture is enabled.
> +	CMA	Contiguous Memory Area support is enabled.
>  	DRM	Direct Rendering Management support is enabled.
>  	DYNAMIC_DEBUG Build in debug messages and enable them at runtime
>  	EDD	BIOS Enhanced Disk Drive Services (EDD) is enabled
> @@ -2634,6 +2635,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>  			Useful for devices that are detected asynchronously
>  			(e.g. USB and MMC devices).
>  
> +	rproc_mem=nn[KMG][@address]
> +			[KNL,ARM,CMA] Remoteproc physical memory block.
> +			Memory area to be used by remote processor image,
> +			managed by CMA.  Suitable defaults exist if not
> +			specified.

There are no defaults now, right?

> +
>  	rw		[KNL] Mount root device read-write on boot
>  
>  	S		[KNL] Run init in single mode
> diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-davinci/devices-da8xx.c
> index fb2f51b..e8016ca 100644
> --- a/arch/arm/mach-davinci/devices-da8xx.c
> +++ b/arch/arm/mach-davinci/devices-da8xx.c
> @@ -12,10 +12,11 @@
>   */
>  #include <linux/init.h>
>  #include <linux/platform_device.h>
> -#include <linux/dma-mapping.h>
> +#include <linux/dma-contiguous.h>
>  #include <linux/serial_8250.h>
>  #include <linux/ahci_platform.h>
>  #include <linux/clk.h>
> +#include <linux/platform_data/da8xx-remoteproc.h>
>  
>  #include <mach/cputype.h>
>  #include <mach/common.h>
> @@ -706,6 +707,96 @@ int __init da850_register_mmcsd1(struct davinci_mmc_config *config)
>  }
>  #endif
>  
> +static struct resource da8xx_rproc_resources[] = {
> +	{ /* DSP boot address */
> +		.start		= DA8XX_SYSCFG0_BASE + DA8XX_HOST1CFG_REG,
> +		.end		= DA8XX_SYSCFG0_BASE + DA8XX_HOST1CFG_REG + 3,
> +		.flags		= IORESOURCE_MEM,
> +	},
> +	{ /* dsp irq */
> +		.start		= IRQ_DA8XX_CHIPINT0,
> +		.end		= IRQ_DA8XX_CHIPINT0,
> +		.flags		= IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct da8xx_rproc_pdata rproc_pdata = {
> +	.name		= "dsp",
> +};

Since the driver is only for da850 so the name of the remote processor
is fixed and can probably be hardcoded in the driver itself.

> +
> +static struct platform_device da8xx_dsp = {
> +	.name	= "davinci-rproc",
> +	.id	= 0,
> +	.dev	= {
> +		.platform_data		= &rproc_pdata,
> +		.coherent_dma_mask	= DMA_BIT_MASK(32),
> +	},
> +	.num_resources	= ARRAY_SIZE(da8xx_rproc_resources),
> +	.resource	= da8xx_rproc_resources,
> +};
> +
> +#if IS_ENABLED(CONFIG_DAVINCI_REMOTEPROC)
> +
> +static phys_addr_t rproc_base __initdata;
> +static unsigned long rproc_size __initdata;
> +
> +static int __init early_rproc_mem(char *p)
> +{
> +	char *endp;
> +
> +	if (p == NULL)
> +		return 0;
> +
> +	rproc_size = memparse(p, &endp);
> +	if (*endp == '@')
> +		rproc_base = memparse(endp + 1, NULL);
> +
> +	return 0;
> +}
> +early_param("rproc_mem", early_rproc_mem);
> +
> +void __init da8xx_rproc_reserve_cma(void)
> +{
> +	int ret;
> +
> +	if (!rproc_base || !rproc_size) {
> +		pr_err("%s: 'rproc_mem=nn at address' badly specified\n"
> +		       "    'nn' and 'address' must both be non-zero\n",
> +		       __func__);
> +
> +		return;
> +	}
> +
> +	pr_info("%s: reserving 0x%lx @ 0x%lx...\n",
> +		__func__, rproc_size, (unsigned long)rproc_base);
> +
> +	ret = dma_declare_contiguous(&da8xx_dsp.dev, rproc_size, rproc_base, 0);
> +	if (ret)
> +		pr_err("%s: dma_declare_contiguous failed %d\n", __func__, ret);
> +}
> +
> +#else
> +
> +void __init da8xx_rproc_reserve_cma(void)
> +{
> +}
> +
> +#endif
> +
> +int __init da8xx_register_rproc(void)
> +{
> +	int ret;
> +
> +	ret = platform_device_register(&da8xx_dsp);
> +	if (ret) {
> +		pr_err("%s: platform_device_register: %d\n", __func__, ret);
> +
> +		return ret;
> +	}
> +
> +	return 0;
> +};
> +
>  static struct resource da8xx_rtc_resources[] = {
>  	{
>  		.start		= DA8XX_RTC_BASE,
> diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
> index 700d311..e9295bd 100644
> --- a/arch/arm/mach-davinci/include/mach/da8xx.h
> +++ b/arch/arm/mach-davinci/include/mach/da8xx.h
> @@ -54,6 +54,7 @@ extern unsigned int da850_max_speed;
>  #define DA8XX_SYSCFG0_BASE	(IO_PHYS + 0x14000)
>  #define DA8XX_SYSCFG0_VIRT(x)	(da8xx_syscfg0_base + (x))
>  #define DA8XX_JTAG_ID_REG	0x18
> +#define DA8XX_HOST1CFG_REG	0x44
>  #define DA8XX_CFGCHIP0_REG	0x17c
>  #define DA8XX_CFGCHIP2_REG	0x184
>  #define DA8XX_CFGCHIP3_REG	0x188
> @@ -105,6 +106,9 @@ int __init da850_register_vpif_display
>  int __init da850_register_vpif_capture
>  			(struct vpif_capture_config *capture_config);
>  void da8xx_restart(char mode, const char *cmd);
> +void __init da8xx_rproc_reserve_cma(void);

No need of __init qualifier in function prototypes.

The patch looks good to me otherwise, but I will not apply it right away
and instead wait for the driver to get accepted first.

Thanks,
Sekhar