ARM: davinci: da8xx: add remoteproc support
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>
diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-davinci/devices-da8xx.c
index cb97e07..bf57252 100644
--- a/arch/arm/mach-davinci/devices-da8xx.c
+++ b/arch/arm/mach-davinci/devices-da8xx.c
@@ -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 @@
}
#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,