1 // SPDX-License-Identifier: BSD-3-Clause
3 * Qualcomm SPMI bus driver
5 * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
7 * Loosely based on Little Kernel driver
15 #include <spmi/spmi.h>
17 DECLARE_GLOBAL_DATA_PTR;
19 /* PMIC Arbiter configuration registers */
20 #define PMIC_ARB_VERSION 0x0000
21 #define PMIC_ARB_VERSION_V2_MIN 0x20010000
23 #define ARB_CHANNEL_OFFSET(n) (0x4 * (n))
24 #define SPMI_CH_OFFSET(chnl) ((chnl) * 0x8000)
26 #define SPMI_REG_CMD0 0x0
27 #define SPMI_REG_CONFIG 0x4
28 #define SPMI_REG_STATUS 0x8
29 #define SPMI_REG_WDATA 0x10
30 #define SPMI_REG_RDATA 0x18
32 #define SPMI_CMD_OPCODE_SHIFT 27
33 #define SPMI_CMD_SLAVE_ID_SHIFT 20
34 #define SPMI_CMD_ADDR_SHIFT 12
35 #define SPMI_CMD_ADDR_OFFSET_SHIFT 4
36 #define SPMI_CMD_BYTE_CNT_SHIFT 0
38 #define SPMI_CMD_EXT_REG_WRITE_LONG 0x00
39 #define SPMI_CMD_EXT_REG_READ_LONG 0x01
41 #define SPMI_STATUS_DONE 0x1
43 #define SPMI_MAX_CHANNELS 128
44 #define SPMI_MAX_SLAVES 16
45 #define SPMI_MAX_PERIPH 256
47 struct msm_spmi_priv {
48 phys_addr_t arb_chnl; /* ARB channel mapping base */
49 phys_addr_t spmi_core; /* SPMI core */
50 phys_addr_t spmi_obs; /* SPMI observer */
51 /* SPMI channel map */
52 uint8_t channel_map[SPMI_MAX_SLAVES][SPMI_MAX_PERIPH];
55 static int msm_spmi_write(struct udevice *dev, int usid, int pid, int off,
58 struct msm_spmi_priv *priv = dev_get_priv(dev);
62 if (usid >= SPMI_MAX_SLAVES)
64 if (pid >= SPMI_MAX_PERIPH)
67 channel = priv->channel_map[usid][pid];
69 /* Disable IRQ mode for the current channel*/
70 writel(0x0, priv->spmi_core + SPMI_CH_OFFSET(channel) +
73 /* Write single byte */
74 writel(val, priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_WDATA);
76 /* Prepare write command */
77 reg |= SPMI_CMD_EXT_REG_WRITE_LONG << SPMI_CMD_OPCODE_SHIFT;
78 reg |= (usid << SPMI_CMD_SLAVE_ID_SHIFT);
79 reg |= (pid << SPMI_CMD_ADDR_SHIFT);
80 reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT);
81 reg |= 1; /* byte count */
83 /* Send write command */
84 writel(reg, priv->spmi_core + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0);
86 /* Wait till CMD DONE status */
89 reg = readl(priv->spmi_core + SPMI_CH_OFFSET(channel) +
93 if (reg ^ SPMI_STATUS_DONE) {
94 printf("SPMI write failure.\n");
101 static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off)
103 struct msm_spmi_priv *priv = dev_get_priv(dev);
107 if (usid >= SPMI_MAX_SLAVES)
109 if (pid >= SPMI_MAX_PERIPH)
112 channel = priv->channel_map[usid][pid];
114 /* Disable IRQ mode for the current channel*/
115 writel(0x0, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CONFIG);
117 /* Prepare read command */
118 reg |= SPMI_CMD_EXT_REG_READ_LONG << SPMI_CMD_OPCODE_SHIFT;
119 reg |= (usid << SPMI_CMD_SLAVE_ID_SHIFT);
120 reg |= (pid << SPMI_CMD_ADDR_SHIFT);
121 reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT);
122 reg |= 1; /* byte count */
125 writel(reg, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0);
127 /* Wait till CMD DONE status */
130 reg = readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) +
134 if (reg ^ SPMI_STATUS_DONE) {
135 printf("SPMI read failure.\n");
140 return readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) +
141 SPMI_REG_RDATA) & 0xFF;
144 static struct dm_spmi_ops msm_spmi_ops = {
145 .read = msm_spmi_read,
146 .write = msm_spmi_write,
149 static int msm_spmi_probe(struct udevice *dev)
151 struct udevice *parent = dev->parent;
152 struct msm_spmi_priv *priv = dev_get_priv(dev);
153 int node = dev_of_offset(dev);
158 priv->arb_chnl = devfdt_get_addr(dev);
159 priv->spmi_core = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
160 dev_of_offset(parent), node, "reg", 1, NULL, false);
161 priv->spmi_obs = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
162 dev_of_offset(parent), node, "reg", 2, NULL, false);
164 hw_ver = readl(priv->arb_chnl + PMIC_ARB_VERSION - 0x800);
165 is_v1 = (hw_ver < PMIC_ARB_VERSION_V2_MIN);
167 dev_dbg(dev, "PMIC Arb Version-%d (0x%x)\n", (is_v1 ? 1 : 2), hw_ver);
169 if (priv->arb_chnl == FDT_ADDR_T_NONE ||
170 priv->spmi_core == FDT_ADDR_T_NONE ||
171 priv->spmi_obs == FDT_ADDR_T_NONE)
174 /* Scan peripherals connected to each SPMI channel */
175 for (i = 0; i < SPMI_MAX_PERIPH ; i++) {
176 uint32_t periph = readl(priv->arb_chnl + ARB_CHANNEL_OFFSET(i));
177 uint8_t slave_id = (periph & 0xf0000) >> 16;
178 uint8_t pid = (periph & 0xff00) >> 8;
180 priv->channel_map[slave_id][pid] = i;
185 static const struct udevice_id msm_spmi_ids[] = {
186 { .compatible = "qcom,spmi-pmic-arb" },
190 U_BOOT_DRIVER(msm_spmi) = {
193 .of_match = msm_spmi_ids,
194 .ops = &msm_spmi_ops,
195 .probe = msm_spmi_probe,
196 .priv_auto_alloc_size = sizeof(struct msm_spmi_priv),