2 * Qualcomm SPMI bus driver
4 * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
6 * Loosely based on Little Kernel driver
8 * SPDX-License-Identifier: BSD-3-Clause
16 #include <spmi/spmi.h>
18 DECLARE_GLOBAL_DATA_PTR;
20 #define ARB_CHANNEL_OFFSET(n) (0x4 * (n))
21 #define SPMI_CH_OFFSET(chnl) ((chnl) * 0x8000)
23 #define PMIC_ARB_VERSION 0x0000
24 #define PMIC_ARB_VERSION_V2_MIN 0x20010000
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_V2_CMD_OPCODE_SHIFT 27
39 #define SPMI_V2_CMD_ADDR_OFFSET_SHIFT 4
40 #define SPMI_V2_CMD_BYTE_CNT_SHIFT 0
42 #define SPMI_CMD_EXT_REG_WRITE_LONG 0x00
43 #define SPMI_CMD_EXT_REG_READ_LONG 0x01
45 #define SPMI_STATUS_DONE 0x1
47 #define SPMI_MAX_CHANNELS 128
48 #define SPMI_MAX_SLAVES 16
49 #define SPMI_MAX_PERIPH 256
51 #define SPMI_READ_TIMEOUT 100
52 #define SPMI_WRITE_TIMEOUT 100
54 static int pmic_arb_ver;
56 static inline int pmic_arb_is_v1(void)
58 return pmic_arb_ver < PMIC_ARB_VERSION_V2_MIN;
61 struct msm_spmi_priv {
62 phys_addr_t arb_chnl; /* ARB channel mapping base */
63 phys_addr_t spmi_core; /* SPMI core */
64 phys_addr_t spmi_chnls; /* SPMI chnls */
65 phys_addr_t spmi_obs; /* SPMI observer */
66 /* SPMI channel map */
67 uint8_t channel_map[SPMI_MAX_SLAVES][SPMI_MAX_PERIPH];
70 static int msm_spmi_write(struct udevice *dev, int usid, int pid, int off,
73 struct msm_spmi_priv *priv = dev_get_priv(dev);
77 if (usid >= SPMI_MAX_SLAVES)
79 if (pid >= SPMI_MAX_PERIPH)
82 channel = priv->channel_map[usid][pid];
84 /* Disable IRQ mode for the current channel */
85 writel(0x0, priv->spmi_chnls + SPMI_CH_OFFSET(channel) +
88 /* Write single byte */
89 writel(val, priv->spmi_chnls + SPMI_CH_OFFSET(channel) + SPMI_REG_WDATA);
91 /* Prepare write command */
92 if (pmic_arb_is_v1()) {
93 reg |= SPMI_CMD_EXT_REG_WRITE_LONG << SPMI_CMD_OPCODE_SHIFT;
94 reg |= (usid << SPMI_CMD_SLAVE_ID_SHIFT);
95 reg |= (pid << SPMI_CMD_ADDR_SHIFT);
96 reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT);
97 reg |= 1; /* byte count */
99 reg |= SPMI_CMD_EXT_REG_WRITE_LONG << SPMI_CMD_OPCODE_SHIFT;
100 reg |= ((off & 0xff) << SPMI_CMD_ADDR_OFFSET_SHIFT);
101 reg |= 0; /* byte count - 1 */
103 /* Send write command */
104 writel(reg, priv->spmi_chnls + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0);
106 /* Wait till CMD DONE status */
109 reg = readl(priv->spmi_core + SPMI_CH_OFFSET(channel) +
113 if (reg ^ SPMI_STATUS_DONE) {
114 printf("SPMI write failure.\n");
121 static int msm_spmi_read(struct udevice *dev, int usid, int pid, int off)
123 struct msm_spmi_priv *priv = dev_get_priv(dev);
127 if (usid >= SPMI_MAX_SLAVES)
129 if (pid >= SPMI_MAX_PERIPH)
132 channel = priv->channel_map[usid][pid];
134 /* Disable IRQ mode for the current channel*/
135 writel(0x0, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CONFIG);
137 /* Prepare read command */
138 if (pmic_arb_is_v1()) {
139 reg |= SPMI_CMD_EXT_REG_READ_LONG << SPMI_CMD_OPCODE_SHIFT;
140 reg |= (usid << SPMI_CMD_SLAVE_ID_SHIFT);
141 reg |= (pid << SPMI_CMD_ADDR_SHIFT);
142 reg |= (off << SPMI_CMD_ADDR_OFFSET_SHIFT);
143 reg |= 1; /* byte count */
145 reg |= SPMI_CMD_EXT_REG_READ_LONG << SPMI_CMD_OPCODE_SHIFT;
146 reg |= ((off & 0xff) << SPMI_CMD_ADDR_OFFSET_SHIFT);
147 reg |= 0; /* byte count - 1 */
151 writel(reg, priv->spmi_obs + SPMI_CH_OFFSET(channel) + SPMI_REG_CMD0);
153 /* Wait till CMD DONE status */
156 reg = readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) +
160 if (reg ^ SPMI_STATUS_DONE) {
161 printf("SPMI read failure.\n");
166 return readl(priv->spmi_obs + SPMI_CH_OFFSET(channel) +
167 SPMI_REG_RDATA) & 0xFF;
170 static struct dm_spmi_ops msm_spmi_ops = {
171 .read = msm_spmi_read,
172 .write = msm_spmi_write,
175 static int msm_spmi_probe(struct udevice *dev)
177 struct udevice *parent = dev->parent;
178 struct msm_spmi_priv *priv = dev_get_priv(dev);
181 priv->spmi_core = dev_get_addr(dev);
182 priv->spmi_chnls = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
187 priv->spmi_obs = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
189 dev->of_offset, "reg",
191 if (priv->spmi_core == FDT_ADDR_T_NONE ||
192 priv->spmi_chnls == FDT_ADDR_T_NONE ||
193 priv->spmi_obs == FDT_ADDR_T_NONE)
196 priv->arb_chnl = priv->spmi_core + 0x800;
198 /* Scan peripherals connected to each SPMI channel */
199 for (i = 0; i < SPMI_MAX_CHANNELS ; i++) {
200 uint32_t periph = readl(priv->arb_chnl + ARB_CHANNEL_OFFSET(i));
201 uint8_t slave_id = (periph & 0xf0000) >> 16;
202 uint8_t pid = (periph & 0xff00) >> 8;
204 priv->channel_map[slave_id][pid] = i;
206 pmic_arb_ver = readl(priv->spmi_core + PMIC_ARB_VERSION);
207 printf("PMIC: PM8916 ARB version %d\n", pmic_arb_is_v1() ? 1 : 2);
211 static const struct udevice_id msm_spmi_ids[] = {
212 { .compatible = "qcom,spmi-pmic-arb" },
216 U_BOOT_DRIVER(msm_spmi) = {
219 .of_match = msm_spmi_ids,
220 .ops = &msm_spmi_ops,
221 .probe = msm_spmi_probe,
222 .priv_auto_alloc_size = sizeof(struct msm_spmi_priv),