xref: /openbmc/u-boot/drivers/mmc/mmc_boot.c (revision 1bad5e14)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2016 Google, Inc
4  * Written by Amar <amarendra.xt@samsung.com>
5  */
6 
7 #include <common.h>
8 #include <mmc.h>
9 #include "mmc_private.h"
10 
11 /*
12  * This function changes the size of boot partition and the size of rpmb
13  * partition present on EMMC devices.
14  *
15  * Input Parameters:
16  * struct *mmc: pointer for the mmc device strcuture
17  * bootsize: size of boot partition
18  * rpmbsize: size of rpmb partition
19  *
20  * Returns 0 on success.
21  */
22 
23 int mmc_boot_partition_size_change(struct mmc *mmc, unsigned long bootsize,
24 				unsigned long rpmbsize)
25 {
26 	int err;
27 	struct mmc_cmd cmd;
28 
29 	/* Only use this command for raw EMMC moviNAND. Enter backdoor mode */
30 	cmd.cmdidx = MMC_CMD_RES_MAN;
31 	cmd.resp_type = MMC_RSP_R1b;
32 	cmd.cmdarg = MMC_CMD62_ARG1;
33 
34 	err = mmc_send_cmd(mmc, &cmd, NULL);
35 	if (err) {
36 		debug("mmc_boot_partition_size_change: Error1 = %d\n", err);
37 		return err;
38 	}
39 
40 	/* Boot partition changing mode */
41 	cmd.cmdidx = MMC_CMD_RES_MAN;
42 	cmd.resp_type = MMC_RSP_R1b;
43 	cmd.cmdarg = MMC_CMD62_ARG2;
44 
45 	err = mmc_send_cmd(mmc, &cmd, NULL);
46 	if (err) {
47 		debug("mmc_boot_partition_size_change: Error2 = %d\n", err);
48 		return err;
49 	}
50 	/* boot partition size is multiple of 128KB */
51 	bootsize = (bootsize * 1024) / 128;
52 
53 	/* Arg: boot partition size */
54 	cmd.cmdidx = MMC_CMD_RES_MAN;
55 	cmd.resp_type = MMC_RSP_R1b;
56 	cmd.cmdarg = bootsize;
57 
58 	err = mmc_send_cmd(mmc, &cmd, NULL);
59 	if (err) {
60 		debug("mmc_boot_partition_size_change: Error3 = %d\n", err);
61 		return err;
62 	}
63 	/* RPMB partition size is multiple of 128KB */
64 	rpmbsize = (rpmbsize * 1024) / 128;
65 	/* Arg: RPMB partition size */
66 	cmd.cmdidx = MMC_CMD_RES_MAN;
67 	cmd.resp_type = MMC_RSP_R1b;
68 	cmd.cmdarg = rpmbsize;
69 
70 	err = mmc_send_cmd(mmc, &cmd, NULL);
71 	if (err) {
72 		debug("mmc_boot_partition_size_change: Error4 = %d\n", err);
73 		return err;
74 	}
75 	return 0;
76 }
77 
78 /*
79  * Modify EXT_CSD[177] which is BOOT_BUS_WIDTH
80  * based on the passed in values for BOOT_BUS_WIDTH, RESET_BOOT_BUS_WIDTH
81  * and BOOT_MODE.
82  *
83  * Returns 0 on success.
84  */
85 int mmc_set_boot_bus_width(struct mmc *mmc, u8 width, u8 reset, u8 mode)
86 {
87 	return mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_BUS_WIDTH,
88 			  EXT_CSD_BOOT_BUS_WIDTH_MODE(mode) |
89 			  EXT_CSD_BOOT_BUS_WIDTH_RESET(reset) |
90 			  EXT_CSD_BOOT_BUS_WIDTH_WIDTH(width));
91 }
92 
93 /*
94  * Modify EXT_CSD[179] which is PARTITION_CONFIG (formerly BOOT_CONFIG)
95  * based on the passed in values for BOOT_ACK, BOOT_PARTITION_ENABLE and
96  * PARTITION_ACCESS.
97  *
98  * Returns 0 on success.
99  */
100 int mmc_set_part_conf(struct mmc *mmc, u8 ack, u8 part_num, u8 access)
101 {
102 	int ret;
103 	u8 part_conf;
104 
105 	part_conf = EXT_CSD_BOOT_ACK(ack) |
106 		    EXT_CSD_BOOT_PART_NUM(part_num) |
107 		    EXT_CSD_PARTITION_ACCESS(access);
108 
109 	ret = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONF,
110 			 part_conf);
111 	if (!ret)
112 		mmc->part_config = part_conf;
113 
114 	return ret;
115 }
116 
117 /*
118  * Modify EXT_CSD[162] which is RST_n_FUNCTION based on the given value
119  * for enable.  Note that this is a write-once field for non-zero values.
120  *
121  * Returns 0 on success.
122  */
123 int mmc_set_rst_n_function(struct mmc *mmc, u8 enable)
124 {
125 	return mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_RST_N_FUNCTION,
126 			  enable);
127 }
128