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/*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#include <asm/mach-imx/rdc-sema.h>
#include <asm/arch/imx-rdc.h>
#include <linux/errno.h>
/*
* Check if the RDC Semaphore is required for this peripheral.
*/
static inline int imx_rdc_check_sema_required(int per_id)
{
struct rdc_regs *imx_rdc = (struct rdc_regs *)RDC_BASE_ADDR;
u32 reg;
reg = readl(&imx_rdc->pdap[per_id]);
/*
* No semaphore:
* Intial value or this peripheral is assigned to only one domain
*/
if (!(reg & RDC_PDAP_SREQ_MASK))
return -ENOENT;
return 0;
}
/*
* Check the peripheral read / write access permission on Domain [dom_id].
*/
int imx_rdc_check_permission(int per_id, int dom_id)
{
struct rdc_regs *imx_rdc = (struct rdc_regs *)RDC_BASE_ADDR;
u32 reg;
reg = readl(&imx_rdc->pdap[per_id]);
if (!(reg & RDC_PDAP_DRW_MASK(dom_id)))
return -EACCES; /*No access*/
return 0;
}
/*
* Lock up the RDC semaphore for this peripheral if semaphore is required.
*/
int imx_rdc_sema_lock(int per_id)
{
struct rdc_sema_regs *imx_rdc_sema;
int ret;
u8 reg;
ret = imx_rdc_check_sema_required(per_id);
if (ret)
return ret;
if (per_id < SEMA_GATES_NUM)
imx_rdc_sema = (struct rdc_sema_regs *)SEMAPHORE1_BASE_ADDR;
else
imx_rdc_sema = (struct rdc_sema_regs *)SEMAPHORE2_BASE_ADDR;
do {
writeb(RDC_SEMA_PROC_ID,
&imx_rdc_sema->gate[per_id % SEMA_GATES_NUM]);
reg = readb(&imx_rdc_sema->gate[per_id % SEMA_GATES_NUM]);
if ((reg & RDC_SEMA_GATE_GTFSM_MASK) == RDC_SEMA_PROC_ID)
break; /* Get the Semaphore*/
} while (1);
return 0;
}
/*
* Unlock the RDC semaphore for this peripheral if main CPU is the
* semaphore owner.
*/
int imx_rdc_sema_unlock(int per_id)
{
struct rdc_sema_regs *imx_rdc_sema;
int ret;
u8 reg;
ret = imx_rdc_check_sema_required(per_id);
if (ret)
return ret;
if (per_id < SEMA_GATES_NUM)
imx_rdc_sema = (struct rdc_sema_regs *)SEMAPHORE1_BASE_ADDR;
else
imx_rdc_sema = (struct rdc_sema_regs *)SEMAPHORE2_BASE_ADDR;
reg = readb(&imx_rdc_sema->gate[per_id % SEMA_GATES_NUM]);
if ((reg & RDC_SEMA_GATE_GTFSM_MASK) != RDC_SEMA_PROC_ID)
return -EACCES; /*Not the semaphore owner */
writeb(0x0, &imx_rdc_sema->gate[per_id % SEMA_GATES_NUM]);
return 0;
}
/*
* Setup RDC setting for one peripheral
*/
int imx_rdc_setup_peri(rdc_peri_cfg_t p)
{
struct rdc_regs *imx_rdc = (struct rdc_regs *)RDC_BASE_ADDR;
u32 reg = 0;
u32 share_count = 0;
u32 peri_id = p & RDC_PERI_MASK;
u32 domain = (p & RDC_DOMAIN_MASK) >> RDC_DOMAIN_SHIFT_BASE;
/* No domain assigned */
if (domain == 0)
return -EINVAL;
reg |= domain;
share_count = (domain & 0x3)
+ ((domain >> 2) & 0x3)
+ ((domain >> 4) & 0x3)
+ ((domain >> 6) & 0x3);
if (share_count > 0x3)
reg |= RDC_PDAP_SREQ_MASK;
writel(reg, &imx_rdc->pdap[peri_id]);
return 0;
}
/*
* Setup RDC settings for multiple peripherals
*/
int imx_rdc_setup_peripherals(rdc_peri_cfg_t const *peripherals_list,
unsigned count)
{
rdc_peri_cfg_t const *p = peripherals_list;
int i, ret;
for (i = 0; i < count; i++) {
ret = imx_rdc_setup_peri(*p);
if (ret)
return ret;
p++;
}
return 0;
}
/*
* Setup RDC setting for one master
*/
int imx_rdc_setup_ma(rdc_ma_cfg_t p)
{
struct rdc_regs *imx_rdc = (struct rdc_regs *)RDC_BASE_ADDR;
u32 master_id = (p & RDC_MASTER_MASK) >> RDC_MASTER_SHIFT;
u32 domain = (p & RDC_DOMAIN_MASK) >> RDC_DOMAIN_SHIFT_BASE;
writel((domain & RDC_MDA_DID_MASK), &imx_rdc->mda[master_id]);
return 0;
}
/*
* Setup RDC settings for multiple masters
*/
int imx_rdc_setup_masters(rdc_ma_cfg_t const *masters_list, unsigned count)
{
rdc_ma_cfg_t const *p = masters_list;
int i, ret;
for (i = 0; i < count; i++) {
ret = imx_rdc_setup_ma(*p);
if (ret)
return ret;
p++;
}
return 0;
}
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