In prepareation for devicetree probing.
Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
---
arch/arm/boards/raspberry-pi/rpi-common.c | 2 +
arch/arm/mach-bcm283x/include/mach/core.h | 6 +++
arch/arm/mach-bcm283x/include/mach/mbox.h | 19 +++++----
arch/arm/mach-bcm283x/include/mach/platform.h | 1 +
arch/arm/mach-bcm283x/mbox.c | 55 ++++++++++++++++++++++-----
5 files changed, 63 insertions(+), 20 deletions(-)
diff --git a/arch/arm/boards/raspberry-pi/rpi-common.c
b/arch/arm/boards/raspberry-pi/rpi-common.c
index db9af2be4245..d0f4fcb3bad9 100644
--- a/arch/arm/boards/raspberry-pi/rpi-common.c
+++ b/arch/arm/boards/raspberry-pi/rpi-common.c
@@ -280,6 +280,8 @@ mem_initcall(rpi_mem_init);
static int rpi_postcore_init(void)
{
+ bcm2835_register_mbox();
+
rpi_get_board_rev();
barebox_set_hostname("rpi");
diff --git a/arch/arm/mach-bcm283x/include/mach/core.h
b/arch/arm/mach-bcm283x/include/mach/core.h
index b0bed80ea000..ce54d38707d8 100644
--- a/arch/arm/mach-bcm283x/include/mach/core.h
+++ b/arch/arm/mach-bcm283x/include/mach/core.h
@@ -32,4 +32,10 @@ static void inline bcm2835_register_fb(void)
add_generic_device("bcm2835_fb", 0, NULL, 0, 0, 0, NULL);
}
+static void inline bcm2835_register_mbox(void)
+{
+ add_generic_device("bcm2835_mbox", 0, NULL, BCM2835_MBOX_BASE, 0x40,
+ IORESOURCE_MEM, NULL);
+}
+
#endif
diff --git a/arch/arm/mach-bcm283x/include/mach/mbox.h
b/arch/arm/mach-bcm283x/include/mach/mbox.h
index cd9ee1f43415..2b5aea88ee0a 100644
--- a/arch/arm/mach-bcm283x/include/mach/mbox.h
+++ b/arch/arm/mach-bcm283x/include/mach/mbox.h
@@ -41,16 +41,15 @@
*/
/* Raw mailbox HW */
-
-#define BCM2835_MBOX_PHYSADDR (BCM2835_ARM_BASE + 0x880)
-
-struct bcm2835_mbox_regs {
- u32 read;
- u32 rsvd0[5];
- u32 status;
- u32 config;
- u32 write;
-};
+#define ARM_0_MAIL0 0x00
+#define ARM_0_MAIL1 0x20
+
+#define MAIL0_RD (ARM_0_MAIL0 + 0x00)
+#define MAIL0_POL (ARM_0_MAIL0 + 0x10)
+#define MAIL0_STA (ARM_0_MAIL0 + 0x18)
+#define MAIL0_CNF (ARM_0_MAIL0 + 0x1C)
+#define MAIL1_WRT (ARM_0_MAIL1 + 0x00)
+#define MAIL1_STA (ARM_0_MAIL1 + 0x18)
#define BCM2835_MBOX_STATUS_WR_FULL 0x80000000
#define BCM2835_MBOX_STATUS_RD_EMPTY 0x40000000
diff --git a/arch/arm/mach-bcm283x/include/mach/platform.h
b/arch/arm/mach-bcm283x/include/mach/platform.h
index 3b73831aa522..09fe78fd41f6 100644
--- a/arch/arm/mach-bcm283x/include/mach/platform.h
+++ b/arch/arm/mach-bcm283x/include/mach/platform.h
@@ -41,6 +41,7 @@
#define BCM2835_ST_BASE (BCM2835_PERI_BASE + 0x3000) /*
System Timer */
#define BCM2835_DMA_BASE (BCM2835_PERI_BASE + 0x7000) /* DMA
controller */
#define BCM2835_ARM_BASE (BCM2835_PERI_BASE + 0xB000) /* BCM2708 ARM
control block */
+#define BCM2835_MBOX_BASE (BCM2835_ARM_BASE + 0x880) /* BCM2835
mailbox */
#define BCM2835_PM_BASE (BCM2835_PERI_BASE + 0x100000) /*
Power Management, Reset controller and Watchdog registers */
#define BCM2835_GPIO_BASE (BCM2835_PERI_BASE + 0x200000) /* GPIO */
#define BCM2835_UART0_BASE (BCM2835_PERI_BASE + 0x201000) /* Uart 0 */
diff --git a/arch/arm/mach-bcm283x/mbox.c b/arch/arm/mach-bcm283x/mbox.c
index 9d69bc8ea784..b295993359fa 100644
--- a/arch/arm/mach-bcm283x/mbox.c
+++ b/arch/arm/mach-bcm283x/mbox.c
@@ -6,20 +6,21 @@
* SPDX-License-Identifier: GPL-2.0+
*/
-#include <asm/io.h>
-#include <common.h>
#include <clock.h>
+#include <common.h>
#include <dma.h>
+#include <init.h>
+#include <io.h>
#include <mach/mbox.h>
#define TIMEOUT (MSECOND * 1000)
+static void __iomem *mbox_base;
+
static int bcm2835_mbox_call_raw(u32 chan, struct bcm2835_mbox_hdr *buffer,
u32 *recv)
{
- struct bcm2835_mbox_regs __iomem *regs =
- (struct bcm2835_mbox_regs *)BCM2835_MBOX_PHYSADDR;
uint64_t starttime = get_time_ns();
u32 send = virt_to_phys(buffer);
u32 val;
@@ -31,19 +32,19 @@ static int bcm2835_mbox_call_raw(u32 chan, struct
bcm2835_mbox_hdr *buffer,
/* Drain any stale responses */
for (;;) {
- val = readl(®s->status);
+ val = readl(mbox_base + MAIL0_STA);
if (val & BCM2835_MBOX_STATUS_RD_EMPTY)
break;
if (is_timeout(starttime, TIMEOUT)) {
printf("mbox: Timeout draining stale responses\n");
return -ETIMEDOUT;
}
- val = readl(®s->read);
+ val = readl(mbox_base + MAIL0_RD);
}
/* Wait for space to send */
for (;;) {
- val = readl(®s->status);
+ val = readl(mbox_base + MAIL0_STA);
if (!(val & BCM2835_MBOX_STATUS_WR_FULL))
break;
if (is_timeout(starttime, TIMEOUT)) {
@@ -57,11 +58,11 @@ static int bcm2835_mbox_call_raw(u32 chan, struct
bcm2835_mbox_hdr *buffer,
debug("mbox: TX raw: 0x%08x\n", val);
dma_sync_single_for_device((unsigned long)send, buffer->buf_size,
DMA_BIDIRECTIONAL);
- writel(val, ®s->write);
+ writel(val, mbox_base + MAIL1_WRT);
/* Wait for the response */
for (;;) {
- val = readl(®s->status);
+ val = readl(mbox_base + MAIL0_STA);
if (!(val & BCM2835_MBOX_STATUS_RD_EMPTY))
break;
if (is_timeout(starttime, TIMEOUT)) {
@@ -71,7 +72,7 @@ static int bcm2835_mbox_call_raw(u32 chan, struct
bcm2835_mbox_hdr *buffer,
}
/* Read the response */
- val = readl(®s->read);
+ val = readl(mbox_base + MAIL0_RD);
debug("mbox: RX raw: 0x%08x\n", val);
dma_sync_single_for_cpu((unsigned long)send, buffer->buf_size,
DMA_BIDIRECTIONAL);
@@ -152,3 +153,37 @@ int bcm2835_mbox_call_prop(u32 chan, struct
bcm2835_mbox_hdr *buffer)
return 0;
}
+
+static int bcm2835_mbox_probe(struct device_d *dev)
+{
+ struct resource *iores;
+
+ iores = dev_request_mem_resource(dev, 0);
+ if (IS_ERR(iores)) {
+ dev_err(dev, "could not get memory region\n");
+ return PTR_ERR(iores);
+ }
+ mbox_base = IOMEM(iores->start);
+
+ return 0;
+}
+
+static __maybe_unused struct of_device_id bcm2835_mbox_dt_ids[] = {
+ {
+ .compatible = "brcm,bcm2835-mbox",
+ }, {
+ /* sentinel */
+ },
+};
+
+static struct driver_d bcm2835_mbox_driver = {
+ .name = "bcm2835_mbox",
+ .of_compatible = DRV_OF_COMPAT(bcm2835_mbox_dt_ids),
+ .probe = bcm2835_mbox_probe,
+};
+
+static int __init bcm2835_mbox_init(void)
+{
+ return platform_driver_register(&bcm2835_mbox_driver);
+}
+core_initcall(bcm2835_mbox_init);
--
2.11.0
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