2 * Copyright (C) 2016 Freescale Semiconductor, Inc.
4 * SPDX-License-Identifier: GPL-2.0+
8 #include <asm/arch/imx-regs.h>
9 #include <asm/imx-common/rdc-sema.h>
10 #include <asm/arch/imx-rdc.h>
11 #include <asm-generic/errno.h>
14 * Check if the RDC Semaphore is required for this peripheral.
16 static inline int imx_rdc_check_sema_required(int per_id)
18 struct rdc_regs *imx_rdc = (struct rdc_regs *)RDC_BASE_ADDR;
21 reg = readl(&imx_rdc->pdap[per_id]);
24 * Intial value or this peripheral is assigned to only one domain
26 if (!(reg & RDC_PDAP_SREQ_MASK))
33 * Check the peripheral read / write access permission on Domain [dom_id].
35 int imx_rdc_check_permission(int per_id, int dom_id)
37 struct rdc_regs *imx_rdc = (struct rdc_regs *)RDC_BASE_ADDR;
40 reg = readl(&imx_rdc->pdap[per_id]);
41 if (!(reg & RDC_PDAP_DRW_MASK(dom_id)))
42 return -EACCES; /*No access*/
48 * Lock up the RDC semaphore for this peripheral if semaphore is required.
50 int imx_rdc_sema_lock(int per_id)
52 struct rdc_sema_regs *imx_rdc_sema;
56 ret = imx_rdc_check_sema_required(per_id);
60 if (per_id < SEMA_GATES_NUM)
61 imx_rdc_sema = (struct rdc_sema_regs *)SEMAPHORE1_BASE_ADDR;
63 imx_rdc_sema = (struct rdc_sema_regs *)SEMAPHORE2_BASE_ADDR;
66 writeb(RDC_SEMA_PROC_ID,
67 &imx_rdc_sema->gate[per_id % SEMA_GATES_NUM]);
68 reg = readb(&imx_rdc_sema->gate[per_id % SEMA_GATES_NUM]);
69 if ((reg & RDC_SEMA_GATE_GTFSM_MASK) == RDC_SEMA_PROC_ID)
70 break; /* Get the Semaphore*/
77 * Unlock the RDC semaphore for this peripheral if main CPU is the
80 int imx_rdc_sema_unlock(int per_id)
82 struct rdc_sema_regs *imx_rdc_sema;
86 ret = imx_rdc_check_sema_required(per_id);
90 if (per_id < SEMA_GATES_NUM)
91 imx_rdc_sema = (struct rdc_sema_regs *)SEMAPHORE1_BASE_ADDR;
93 imx_rdc_sema = (struct rdc_sema_regs *)SEMAPHORE2_BASE_ADDR;
95 reg = readb(&imx_rdc_sema->gate[per_id % SEMA_GATES_NUM]);
96 if ((reg & RDC_SEMA_GATE_GTFSM_MASK) != RDC_SEMA_PROC_ID)
97 return 1; /*Not the semaphore owner */
99 writeb(0x0, &imx_rdc_sema->gate[per_id % SEMA_GATES_NUM]);
105 * Setup RDC setting for one peripheral
107 int imx_rdc_setup_peri(rdc_peri_cfg_t p)
109 struct rdc_regs *imx_rdc = (struct rdc_regs *)RDC_BASE_ADDR;
112 u32 peri_id = p & RDC_PERI_MASK;
113 u32 domain = (p & RDC_DOMAIN_MASK) >> RDC_DOMAIN_SHIFT_BASE;
115 /* No domain assigned */
121 share_count = (domain & 0x3)
122 + ((domain >> 2) & 0x3)
123 + ((domain >> 4) & 0x3)
124 + ((domain >> 6) & 0x3);
126 if (share_count > 0x3)
127 reg |= RDC_PDAP_SREQ_MASK;
129 writel(reg, &imx_rdc->pdap[peri_id]);
135 * Setup RDC settings for multiple peripherals
137 int imx_rdc_setup_peripherals(rdc_peri_cfg_t const *peripherals_list,
140 rdc_peri_cfg_t const *p = peripherals_list;
143 for (i = 0; i < count; i++) {
144 ret = imx_rdc_setup_peri(*p);
154 * Setup RDC setting for one master
156 int imx_rdc_setup_ma(rdc_ma_cfg_t p)
158 struct rdc_regs *imx_rdc = (struct rdc_regs *)RDC_BASE_ADDR;
159 u32 master_id = (p & RDC_MASTER_MASK) >> RDC_MASTER_SHIFT;
160 u32 domain = (p & RDC_DOMAIN_MASK) >> RDC_DOMAIN_SHIFT_BASE;
162 writel((domain & RDC_MDA_DID_MASK), &imx_rdc->mda[master_id]);
168 * Setup RDC settings for multiple masters
170 int imx_rdc_setup_masters(rdc_ma_cfg_t const *masters_list, unsigned count)
172 rdc_ma_cfg_t const *p = masters_list;
175 for (i = 0; i < count; i++) {
176 ret = imx_rdc_setup_ma(*p);