+++ /dev/null
-From d5c6191cc94b358de183cc8c88a5722a79445202 Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.org>
-Date: Thu, 1 Nov 2018 17:31:37 +0000
-Subject: [PATCH] vchiq: Add 36-bit address support
-
-Conditional on a new compatible string, change the pagelist encoding
-such that the top 24 bits are the pfn, leaving 8 bits for run length
-(-1).
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
----
- .../interface/vchiq_arm/vchiq_2835_arm.c | 90 ++++++++++++++-----
- .../interface/vchiq_arm/vchiq_arm.c | 6 ++
- .../interface/vchiq_arm/vchiq_arm.h | 1 +
- 3 files changed, 75 insertions(+), 22 deletions(-)
-
---- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
-+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
-@@ -47,6 +47,8 @@
- #include <soc/bcm2835/raspberrypi-firmware.h>
-
- #define TOTAL_SLOTS (VCHIQ_SLOT_ZERO_SLOTS + 2 * 32)
-+#define VC_SAFE(x) (g_use_36bit_addrs ? ((u32)(x) | 0xc0000000) : (u32)(x))
-+#define IS_VC_SAFE(x) (g_use_36bit_addrs ? !((x) & ~0x3fffffffull) : 1)
-
- #include "vchiq_arm.h"
- #include "vchiq_connected.h"
-@@ -96,6 +98,7 @@ static void __iomem *g_regs;
- */
- static unsigned int g_cache_line_size;
- static struct dma_pool *g_dma_pool;
-+static unsigned int g_use_36bit_addrs = 0;
- static unsigned int g_fragments_size;
- static char *g_fragments_base;
- static char *g_free_fragments;
-@@ -139,6 +142,8 @@ int vchiq_platform_init(struct platform_
- g_cache_line_size = drvdata->cache_line_size;
- g_fragments_size = 2 * g_cache_line_size;
-
-+ g_use_36bit_addrs = (dev->dma_pfn_offset == 0);
-+
- /* Allocate space for the channels in coherent memory */
- slot_mem_size = PAGE_ALIGN(TOTAL_SLOTS * VCHIQ_SLOT_SIZE);
- frag_mem_size = PAGE_ALIGN(g_fragments_size * MAX_FRAGMENTS);
-@@ -150,14 +155,21 @@ int vchiq_platform_init(struct platform_
- return -ENOMEM;
- }
-
-+ if (!IS_VC_SAFE(slot_phys)) {
-+ dev_err(dev, "allocated DMA memory %pad is not VC-safe\n",
-+ &slot_phys);
-+ return -ENOMEM;
-+ }
-+
- WARN_ON(((unsigned long)slot_mem & (PAGE_SIZE - 1)) != 0);
-+ channelbase = VC_SAFE(slot_phys);
-
- vchiq_slot_zero = vchiq_init_slots(slot_mem, slot_mem_size);
- if (!vchiq_slot_zero)
- return -EINVAL;
-
- vchiq_slot_zero->platform_data[VCHIQ_PLATFORM_FRAGMENTS_OFFSET_IDX] =
-- (int)slot_phys + slot_mem_size;
-+ channelbase + slot_mem_size;
- vchiq_slot_zero->platform_data[VCHIQ_PLATFORM_FRAGMENTS_COUNT_IDX] =
- MAX_FRAGMENTS;
-
-@@ -193,7 +205,6 @@ int vchiq_platform_init(struct platform_
- }
-
- /* Send the base address of the slots to VideoCore */
-- channelbase = slot_phys;
- err = rpi_firmware_property(fw, RPI_FIRMWARE_VCHIQ_INIT,
- &channelbase, sizeof(channelbase));
- if (err || channelbase) {
-@@ -282,7 +293,7 @@ vchiq_prepare_bulk_data(VCHIQ_BULK_T *bu
- return VCHIQ_ERROR;
-
- bulk->handle = memhandle;
-- bulk->data = (void *)(unsigned long)pagelistinfo->dma_addr;
-+ bulk->data = (void *)VC_SAFE(pagelistinfo->dma_addr);
-
- /*
- * Store the pagelistinfo address in remote_data,
-@@ -570,25 +581,60 @@ create_pagelist(char __user *buf, size_t
-
- /* Combine adjacent blocks for performance */
- k = 0;
-- for_each_sg(scatterlist, sg, dma_buffers, i) {
-- u32 len = sg_dma_len(sg);
-- u32 addr = sg_dma_address(sg);
--
-- /* Note: addrs is the address + page_count - 1
-- * The firmware expects blocks after the first to be page-
-- * aligned and a multiple of the page size
-- */
-- WARN_ON(len == 0);
-- WARN_ON(i && (i != (dma_buffers - 1)) && (len & ~PAGE_MASK));
-- WARN_ON(i && (addr & ~PAGE_MASK));
-- if (k > 0 &&
-- ((addrs[k - 1] & PAGE_MASK) +
-- (((addrs[k - 1] & ~PAGE_MASK) + 1) << PAGE_SHIFT))
-- == (addr & PAGE_MASK))
-- addrs[k - 1] += ((len + PAGE_SIZE - 1) >> PAGE_SHIFT);
-- else
-- addrs[k++] = (addr & PAGE_MASK) |
-- (((len + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1);
-+ if (g_use_36bit_addrs) {
-+ for_each_sg(scatterlist, sg, dma_buffers, i) {
-+ u32 len = sg_dma_len(sg);
-+ u64 addr = sg_dma_address(sg);
-+ u32 page_id = (u32)((addr >> 4) & ~0xff);
-+ u32 sg_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
-+
-+ /* Note: addrs is the address + page_count - 1
-+ * The firmware expects blocks after the first to be page-
-+ * aligned and a multiple of the page size
-+ */
-+ WARN_ON(len == 0);
-+ WARN_ON(i &&
-+ (i != (dma_buffers - 1)) && (len & ~PAGE_MASK));
-+ WARN_ON(i && (addr & ~PAGE_MASK));
-+ WARN_ON(upper_32_bits(addr) > 0xf);
-+ if (k > 0 &&
-+ ((addrs[k - 1] & ~0xff) +
-+ (((addrs[k - 1] & 0xff) + 1) << 8)
-+ == page_id)) {
-+ u32 inc_pages = min(sg_pages,
-+ 0xff - (addrs[k - 1] & 0xff));
-+ addrs[k - 1] += inc_pages;
-+ page_id += inc_pages << 8;
-+ sg_pages -= inc_pages;
-+ }
-+ while (sg_pages) {
-+ u32 inc_pages = min(sg_pages, 0x100u);
-+ addrs[k++] = page_id | (inc_pages - 1);
-+ page_id += inc_pages << 8;
-+ sg_pages -= inc_pages;
-+ }
-+ }
-+ } else {
-+ for_each_sg(scatterlist, sg, dma_buffers, i) {
-+ u32 len = sg_dma_len(sg);
-+ u32 addr = VC_SAFE(sg_dma_address(sg));
-+ u32 new_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
-+
-+ /* Note: addrs is the address + page_count - 1
-+ * The firmware expects blocks after the first to be page-
-+ * aligned and a multiple of the page size
-+ */
-+ WARN_ON(len == 0);
-+ WARN_ON(i && (i != (dma_buffers - 1)) && (len & ~PAGE_MASK));
-+ WARN_ON(i && (addr & ~PAGE_MASK));
-+ if (k > 0 &&
-+ ((addrs[k - 1] & PAGE_MASK) +
-+ (((addrs[k - 1] & ~PAGE_MASK) + 1) << PAGE_SHIFT))
-+ == (addr & PAGE_MASK))
-+ addrs[k - 1] += new_pages;
-+ else
-+ addrs[k++] = (addr & PAGE_MASK) | (new_pages - 1);
-+ }
- }
-
- /* Partial cache lines (fragments) require special measures */
---- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
-+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
-@@ -181,6 +181,11 @@ static struct vchiq_drvdata bcm2836_drvd
- .cache_line_size = 64,
- };
-
-+static struct vchiq_drvdata bcm2838_drvdata = {
-+ .cache_line_size = 64,
-+ .use_36bit_addrs = true,
-+};
-+
- static const char *const ioctl_names[] = {
- "CONNECT",
- "SHUTDOWN",
-@@ -3618,6 +3623,7 @@ vchiq_register_child(struct platform_dev
- static const struct of_device_id vchiq_of_match[] = {
- { .compatible = "brcm,bcm2835-vchiq", .data = &bcm2835_drvdata },
- { .compatible = "brcm,bcm2836-vchiq", .data = &bcm2836_drvdata },
-+ { .compatible = "brcm,bcm2838-vchiq", .data = &bcm2838_drvdata },
- {},
- };
- MODULE_DEVICE_TABLE(of, vchiq_of_match);
---- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h
-+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h
-@@ -125,6 +125,7 @@ typedef struct vchiq_arm_state_struct {
-
- struct vchiq_drvdata {
- const unsigned int cache_line_size;
-+ const bool use_36bit_addrs;
- struct rpi_firmware *fw;
- };
-
projects / openwrt / openwrt.git / blobdiff