26af098e0e
See my upstream questions: https://lore.kernel.org/linux-arm-msm/20200913201608.GA3162100@bDebian/ This effectively reverts upstream Linux commit 13e77747800e ("firmware: qcom: scm: Use atomic SCM for cold boot"), because Google WiFi boot firmwares don't support the atomic variant. This fixes SMP support for Google WiFi. Signed-off-by: Brian Norris <computersforpeace@gmail.com>
122 lines
3.5 KiB
Diff
122 lines
3.5 KiB
Diff
--- a/drivers/firmware/qcom_scm-legacy.c
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+++ b/drivers/firmware/qcom_scm-legacy.c
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@@ -13,6 +13,9 @@
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#include <linux/arm-smccc.h>
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#include <linux/dma-mapping.h>
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+#include <asm/cacheflush.h>
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+#include <asm/outercache.h>
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+
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#include "qcom_scm.h"
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static DEFINE_MUTEX(qcom_scm_lock);
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@@ -117,6 +120,25 @@ static void __scm_legacy_do(const struct
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} while (res->a0 == QCOM_SCM_INTERRUPTED);
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}
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+static void qcom_scm_inv_range(unsigned long start, unsigned long end)
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+{
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+ u32 cacheline_size, ctr;
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+
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+ asm volatile("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
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+ cacheline_size = 4 << ((ctr >> 16) & 0xf);
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+
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+ start = round_down(start, cacheline_size);
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+ end = round_up(end, cacheline_size);
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+ outer_inv_range(start, end);
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+ while (start < end) {
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+ asm ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start)
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+ : "memory");
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+ start += cacheline_size;
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+ }
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+ dsb();
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+ isb();
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+}
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+
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/**
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* qcom_scm_call() - Sends a command to the SCM and waits for the command to
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* finish processing.
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@@ -160,10 +182,16 @@ int scm_legacy_call(struct device *dev,
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rsp = scm_legacy_command_to_response(cmd);
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- cmd_phys = dma_map_single(dev, cmd, alloc_len, DMA_TO_DEVICE);
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- if (dma_mapping_error(dev, cmd_phys)) {
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- kfree(cmd);
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- return -ENOMEM;
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+ if (dev) {
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+ cmd_phys = dma_map_single(dev, cmd, alloc_len, DMA_TO_DEVICE);
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+ if (dma_mapping_error(dev, cmd_phys)) {
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+ kfree(cmd);
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+ return -ENOMEM;
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+ }
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+ } else {
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+ cmd_phys = virt_to_phys(cmd);
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+ __cpuc_flush_dcache_area(cmd, alloc_len);
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+ outer_flush_range(cmd_phys, cmd_phys + alloc_len);
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}
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smc.args[0] = 1;
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@@ -179,13 +207,26 @@ int scm_legacy_call(struct device *dev,
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goto out;
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do {
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- dma_sync_single_for_cpu(dev, cmd_phys + sizeof(*cmd) + cmd_len,
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- sizeof(*rsp), DMA_FROM_DEVICE);
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+ if (dev) {
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+ dma_sync_single_for_cpu(dev, cmd_phys + sizeof(*cmd) +
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+ cmd_len, sizeof(*rsp),
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+ DMA_FROM_DEVICE);
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+ } else {
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+ unsigned long start = (uintptr_t)cmd + sizeof(*cmd) +
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+ cmd_len;
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+ qcom_scm_inv_range(start, start + sizeof(*rsp));
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+ }
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} while (!rsp->is_complete);
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- dma_sync_single_for_cpu(dev, cmd_phys + sizeof(*cmd) + cmd_len +
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- le32_to_cpu(rsp->buf_offset),
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- resp_len, DMA_FROM_DEVICE);
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+ if (dev) {
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+ dma_sync_single_for_cpu(dev, cmd_phys + sizeof(*cmd) + cmd_len +
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+ le32_to_cpu(rsp->buf_offset),
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+ resp_len, DMA_FROM_DEVICE);
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+ } else {
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+ unsigned long start = (uintptr_t)cmd + sizeof(*cmd) + cmd_len +
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+ le32_to_cpu(rsp->buf_offset);
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+ qcom_scm_inv_range(start, start + resp_len);
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+ }
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if (res) {
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res_buf = scm_legacy_get_response_buffer(rsp);
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@@ -193,7 +234,8 @@ int scm_legacy_call(struct device *dev,
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res->result[i] = le32_to_cpu(res_buf[i]);
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}
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out:
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- dma_unmap_single(dev, cmd_phys, alloc_len, DMA_TO_DEVICE);
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+ if (dev)
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+ dma_unmap_single(dev, cmd_phys, alloc_len, DMA_TO_DEVICE);
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kfree(cmd);
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return ret;
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}
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--- a/drivers/firmware/qcom_scm.c
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+++ b/drivers/firmware/qcom_scm.c
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@@ -344,6 +344,17 @@ int qcom_scm_set_cold_boot_addr(void *en
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desc.args[0] = flags;
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desc.args[1] = virt_to_phys(entry);
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+ /*
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+ * Factory firmware doesn't support the atomic variant. Non-atomic SCMs
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+ * require ugly DMA invalidation support that was dropped upstream a
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+ * while ago. For more info, see:
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+ *
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+ * [RFC] qcom_scm: IPQ4019 firmware does not support atomic API?
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+ * https://lore.kernel.org/linux-arm-msm/20200913201608.GA3162100@bDebian/
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+ */
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+ if (of_machine_is_compatible("google,wifi"))
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+ return qcom_scm_call(__scm ? __scm->dev : NULL, &desc, NULL);
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+
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return qcom_scm_call_atomic(__scm ? __scm->dev : NULL, &desc, NULL);
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}
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EXPORT_SYMBOL(qcom_scm_set_cold_boot_addr);
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