1 /* 2 * Qualcomm pm8916 pmic driver 3 * 4 * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 #include <common.h> 9 #include <dm.h> 10 #include <dm/root.h> 11 #include <power/pmic.h> 12 #include <spmi/spmi.h> 13 14 DECLARE_GLOBAL_DATA_PTR; 15 16 #define PID_SHIFT 8 17 #define PID_MASK (0xFF << PID_SHIFT) 18 #define REG_MASK 0xFF 19 20 struct pm8916_priv { 21 uint32_t usid; /* Slave ID on SPMI bus */ 22 }; 23 24 static int pm8916_reg_count(struct udevice *dev) 25 { 26 return 0xFFFF; 27 } 28 29 static int pm8916_write(struct udevice *dev, uint reg, const uint8_t *buff, 30 int len) 31 { 32 struct pm8916_priv *priv = dev_get_priv(dev); 33 34 if (len != 1) 35 return -EINVAL; 36 37 return spmi_reg_write(dev->parent, priv->usid, 38 (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK, 39 *buff); 40 } 41 42 static int pm8916_read(struct udevice *dev, uint reg, uint8_t *buff, int len) 43 { 44 struct pm8916_priv *priv = dev_get_priv(dev); 45 int val; 46 47 if (len != 1) 48 return -EINVAL; 49 50 val = spmi_reg_read(dev->parent, priv->usid, 51 (reg & PID_MASK) >> PID_SHIFT, reg & REG_MASK); 52 53 if (val < 0) 54 return val; 55 *buff = val; 56 return 0; 57 } 58 59 static struct dm_pmic_ops pm8916_ops = { 60 .reg_count = pm8916_reg_count, 61 .read = pm8916_read, 62 .write = pm8916_write, 63 }; 64 65 static const struct udevice_id pm8916_ids[] = { 66 { .compatible = "qcom,spmi-pmic" }, 67 { } 68 }; 69 70 static int pm8916_probe(struct udevice *dev) 71 { 72 struct pm8916_priv *priv = dev_get_priv(dev); 73 74 priv->usid = dev_get_addr(dev); 75 76 if (priv->usid == FDT_ADDR_T_NONE) 77 return -EINVAL; 78 79 return 0; 80 } 81 82 83 static int pm8916_bind(struct udevice *dev) 84 { 85 return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false); 86 } 87 88 U_BOOT_DRIVER(pmic_pm8916) = { 89 .name = "pmic_pm8916", 90 .id = UCLASS_PMIC, 91 .of_match = pm8916_ids, 92 .bind = pm8916_bind, 93 .probe = pm8916_probe, 94 .ops = &pm8916_ops, 95 .priv_auto_alloc_size = sizeof(struct pm8916_priv), 96 }; 97