1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2020-21 Intel Corporation.
6 #include <linux/delay.h>
7 #include <linux/device.h>
9 #include <linux/io-64-nonatomic-lo-hi.h>
10 #include <linux/slab.h>
12 #include "iosm_ipc_mmio.h"
14 /* Definition of MMIO offsets
15 * note that MMIO_CI offsets are relative to end of chip info structure
18 /* MMIO chip info size in bytes */
19 #define MMIO_CHIP_INFO_SIZE 60
21 /* CP execution stage */
22 #define MMIO_OFFSET_EXECUTION_STAGE 0x00
24 /* Boot ROM Chip Info struct */
25 #define MMIO_OFFSET_CHIP_INFO 0x04
27 #define MMIO_OFFSET_ROM_EXIT_CODE 0x40
29 #define MMIO_OFFSET_PSI_ADDRESS 0x54
31 #define MMIO_OFFSET_PSI_SIZE 0x5C
33 #define MMIO_OFFSET_IPC_STATUS 0x60
35 #define MMIO_OFFSET_CONTEXT_INFO 0x64
37 #define MMIO_OFFSET_BASE_ADDR 0x6C
39 #define MMIO_OFFSET_END_ADDR 0x74
41 #define MMIO_OFFSET_CP_VERSION 0xF0
43 #define MMIO_OFFSET_CP_CAPABILITIES 0xF4
45 /* Timeout in 50 msec to wait for the modem boot code to write a valid
46 * execution stage into mmio area
48 #define IPC_MMIO_EXEC_STAGE_TIMEOUT 50
50 /* check if exec stage has one of the valid values */
51 static bool ipc_mmio_is_valid_exec_stage(enum ipc_mem_exec_stage stage)
54 case IPC_MEM_EXEC_STAGE_BOOT:
55 case IPC_MEM_EXEC_STAGE_PSI:
56 case IPC_MEM_EXEC_STAGE_EBL:
57 case IPC_MEM_EXEC_STAGE_RUN:
58 case IPC_MEM_EXEC_STAGE_CRASH:
59 case IPC_MEM_EXEC_STAGE_CD_READY:
66 void ipc_mmio_update_cp_capability(struct iosm_mmio *ipc_mmio)
71 ver = ipc_mmio_get_cp_version(ipc_mmio);
72 cp_cap = ioread32(ipc_mmio->base + ipc_mmio->offset.cp_capability);
74 ipc_mmio->has_mux_lite = (ver >= IOSM_CP_VERSION) &&
75 !(cp_cap & DL_AGGR) && !(cp_cap & UL_AGGR);
77 ipc_mmio->has_ul_flow_credit =
78 (ver >= IOSM_CP_VERSION) && (cp_cap & UL_FLOW_CREDIT);
81 struct iosm_mmio *ipc_mmio_init(void __iomem *mmio, struct device *dev)
83 struct iosm_mmio *ipc_mmio = kzalloc(sizeof(*ipc_mmio), GFP_KERNEL);
84 int retries = IPC_MMIO_EXEC_STAGE_TIMEOUT;
85 enum ipc_mem_exec_stage stage;
92 ipc_mmio->base = mmio;
94 ipc_mmio->offset.exec_stage = MMIO_OFFSET_EXECUTION_STAGE;
96 /* Check for a valid execution stage to make sure that the boot code
97 * has correctly initialized the MMIO area.
100 stage = ipc_mmio_get_exec_stage(ipc_mmio);
101 if (ipc_mmio_is_valid_exec_stage(stage))
105 } while (retries-- > 0);
108 dev_err(ipc_mmio->dev, "invalid exec stage %X", stage);
112 ipc_mmio->offset.chip_info = MMIO_OFFSET_CHIP_INFO;
114 /* read chip info size and version from chip info structure */
115 ipc_mmio->chip_info_version =
116 ioread8(ipc_mmio->base + ipc_mmio->offset.chip_info);
118 /* Increment of 2 is needed as the size value in the chip info
119 * excludes the version and size field, which are always present
121 ipc_mmio->chip_info_size =
122 ioread8(ipc_mmio->base + ipc_mmio->offset.chip_info + 1) + 2;
124 if (ipc_mmio->chip_info_size != MMIO_CHIP_INFO_SIZE) {
125 dev_err(ipc_mmio->dev, "Unexpected Chip Info");
129 ipc_mmio->offset.rom_exit_code = MMIO_OFFSET_ROM_EXIT_CODE;
131 ipc_mmio->offset.psi_address = MMIO_OFFSET_PSI_ADDRESS;
132 ipc_mmio->offset.psi_size = MMIO_OFFSET_PSI_SIZE;
133 ipc_mmio->offset.ipc_status = MMIO_OFFSET_IPC_STATUS;
134 ipc_mmio->offset.context_info = MMIO_OFFSET_CONTEXT_INFO;
135 ipc_mmio->offset.ap_win_base = MMIO_OFFSET_BASE_ADDR;
136 ipc_mmio->offset.ap_win_end = MMIO_OFFSET_END_ADDR;
138 ipc_mmio->offset.cp_version = MMIO_OFFSET_CP_VERSION;
139 ipc_mmio->offset.cp_capability = MMIO_OFFSET_CP_CAPABILITIES;
148 enum ipc_mem_exec_stage ipc_mmio_get_exec_stage(struct iosm_mmio *ipc_mmio)
151 return IPC_MEM_EXEC_STAGE_INVALID;
153 return (enum ipc_mem_exec_stage)ioread32(ipc_mmio->base +
154 ipc_mmio->offset.exec_stage);
157 void ipc_mmio_copy_chip_info(struct iosm_mmio *ipc_mmio, void *dest,
160 if (ipc_mmio && dest)
161 memcpy_fromio(dest, ipc_mmio->base + ipc_mmio->offset.chip_info,
165 enum ipc_mem_device_ipc_state ipc_mmio_get_ipc_state(struct iosm_mmio *ipc_mmio)
168 return IPC_MEM_DEVICE_IPC_INVALID;
170 return (enum ipc_mem_device_ipc_state)ioread32(ipc_mmio->base +
171 ipc_mmio->offset.ipc_status);
174 enum rom_exit_code ipc_mmio_get_rom_exit_code(struct iosm_mmio *ipc_mmio)
177 return IMEM_ROM_EXIT_FAIL;
179 return (enum rom_exit_code)ioread32(ipc_mmio->base +
180 ipc_mmio->offset.rom_exit_code);
183 void ipc_mmio_config(struct iosm_mmio *ipc_mmio)
188 /* AP memory window (full window is open and active so that modem checks
189 * each AP address) 0 means don't check on modem side.
191 iowrite64(0, ipc_mmio->base + ipc_mmio->offset.ap_win_base);
192 iowrite64(0, ipc_mmio->base + ipc_mmio->offset.ap_win_end);
194 iowrite64(ipc_mmio->context_info_addr,
195 ipc_mmio->base + ipc_mmio->offset.context_info);
198 void ipc_mmio_set_psi_addr_and_size(struct iosm_mmio *ipc_mmio, dma_addr_t addr,
204 iowrite64(addr, ipc_mmio->base + ipc_mmio->offset.psi_address);
205 iowrite32(size, ipc_mmio->base + ipc_mmio->offset.psi_size);
208 void ipc_mmio_set_contex_info_addr(struct iosm_mmio *ipc_mmio, phys_addr_t addr)
213 /* store context_info address. This will be stored in the mmio area
214 * during IPC_MEM_DEVICE_IPC_INIT state via ipc_mmio_config()
216 ipc_mmio->context_info_addr = addr;
219 int ipc_mmio_get_cp_version(struct iosm_mmio *ipc_mmio)
222 return ioread32(ipc_mmio->base + ipc_mmio->offset.cp_version);