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ARM: davinci: da8xx: add remoteproc support

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Add remoteproc platform device for controlling the DSP
on da8xx. The patch uses CMA-based reservation of physical
memory block for DSP use. A new kernel command-line parameter
has been added to allow boot-time specification of the physical
memory block.

Signed-off-by: Robert Tivy <rtivy@ti.com>
[nsekhar@ti.com: edit commit message for readability and
style improvements]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
Robert Tivy 2013-03-28 18:41:46 -07:00 committed by Sekhar Nori
parent 93bd65150e
commit 5c71d6181f
3 changed files with 97 additions and 1 deletions
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6
Documentation/kernel-parameters.txt
View File

@ -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
@ -2663,6 +2664,11 @@ 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.
rw [KNL] Mount root device read-write on boot
S [KNL] Run init in single mode

88
arch/arm/mach-davinci/devices-da8xx.c
View File

@ -12,7 +12,7 @@
*/
#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>
@ -714,6 +714,92 @@ 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 interrupt registers */
.start = DA8XX_SYSCFG0_BASE + DA8XX_CHIPSIG_REG,
.end = DA8XX_SYSCFG0_BASE + DA8XX_CHIPSIG_REG + 7,
.flags = IORESOURCE_MEM,
},
{ /* dsp irq */
.start = IRQ_DA8XX_CHIPINT0,
.end = IRQ_DA8XX_CHIPINT0,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device da8xx_dsp = {
.name = "davinci-rproc",
.dev = {
.coherent_dma_mask = DMA_BIT_MASK(32),
},
.num_resources = ARRAY_SIZE(da8xx_rproc_resources),
.resource = da8xx_rproc_resources,
};
#if IS_ENABLED(CONFIG_DA8XX_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@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: can't register DSP device: %d\n", __func__, ret);
return ret;
};
static struct resource da8xx_rtc_resources[] = {
{
.start = DA8XX_RTC_BASE,

4
arch/arm/mach-davinci/include/mach/da8xx.h
View File

@ -54,6 +54,8 @@ 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_CHIPSIG_REG 0x174
#define DA8XX_CFGCHIP0_REG 0x17c
#define DA8XX_CFGCHIP1_REG 0x180
#define DA8XX_CFGCHIP2_REG 0x184
@ -105,6 +107,8 @@ 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 da8xx_rproc_reserve_cma(void);
int da8xx_register_rproc(void);
extern struct platform_device da8xx_serial_device;
extern struct emac_platform_data da8xx_emac_pdata;