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Commit 627b033c authored by Chris Lew's avatar Chris Lew
Browse files

soc: qcom: smem: Add support to get physical addr 



An SMEM item can be handed off to a DMA engine. Add a function to
retrieve the physical address of an smem item.

Change-Id: Ic4137700ad308a5da13aa943e564102f547fadb2
Signed-off-by: default avatarChris Lew <clew@codeaurora.org>
parent 83569191

drivers/soc/qcom/smem.c

+28 −0
Original line number Diff line number Diff line
@@ -647,6 +647,34 @@ int qcom_smem_get_free_space(unsigned host) 
}

EXPORT_SYMBOL(qcom_smem_get_free_space);



/**

 * qcom_smem_virt_to_phys() - Convert SMEM address to physical address.

 * @smem_address	Address of SMEM item (returned by qcom_smem_get())



 * This function should only be used if an SMEM item needs to be handed off

 * to a DMA engine.

 */

phys_addr_t qcom_smem_virt_to_phys(void *addr)

{

	phys_addr_t phys_addr = 0;

	struct smem_region *area;

	void *end;

	int i;



	if (!__smem)

		return phys_addr;



	for (i = 0; i < __smem->num_regions; i++) {

		area = &__smem->regions[i];

		end = area->virt_base + area->size;

		if (addr >= area->virt_base && addr < end)

			phys_addr = addr - area->virt_base + area->aux_base;

	}



	return phys_addr;

}

EXPORT_SYMBOL(qcom_smem_virt_to_phys);



static int qcom_smem_get_sbl_version(struct qcom_smem *smem)

{

	struct smem_header *header;

include/linux/soc/qcom/smem.h

+3 −0
Original line number Diff line number Diff line 
#ifndef __QCOM_SMEM_H__

#define __QCOM_SMEM_H__



#include <linux/types.h>



#define QCOM_SMEM_HOST_ANY -1



int qcom_smem_alloc(unsigned host, unsigned item, size_t size);

void *qcom_smem_get(unsigned host, unsigned item, size_t *size);



int qcom_smem_get_free_space(unsigned host);

phys_addr_t qcom_smem_virt_to_phys(void *addr);



#endif