1 // SPDX-License-Identifier: GPL-2.0
10  *		hisi-spmi-controller.c
11  *		spmi-pmic-arb.c Copyright (c) 2021, The Linux Foundation.
36 	readl_poll_timeout((spmi)->regs + (reg), (val), (cond), \
39 static inline u32 apple_spmi_pack_cmd(u8 opc, u8 sid, u16 saddr, size_t len)  in apple_spmi_pack_cmd()  argument
41 	return opc | sid << 8 | saddr << 16 | (len - 1) | (1 << 15);  in apple_spmi_pack_cmd()
45 static int apple_spmi_wait_rx_not_empty(struct spmi_controller *ctrl)  in apple_spmi_wait_rx_not_empty()  argument
47 	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);  in apple_spmi_wait_rx_not_empty()
53 		dev_err(&ctrl->dev,  in apple_spmi_wait_rx_not_empty()
61 static int spmi_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,  in spmi_read_cmd()  argument
62 			 u16 saddr, u8 *buf, size_t len)  in spmi_read_cmd()  argument
64 	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);  in spmi_read_cmd()
65 	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len);  in spmi_read_cmd()
71 	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);  in spmi_read_cmd()
73 	ret = apple_spmi_wait_rx_not_empty(ctrl);  in spmi_read_cmd()
78 	readl(spmi->regs + SPMI_RSP_REG);  in spmi_read_cmd()
81 	while (len_read < len) {  in spmi_read_cmd()
82 		rsp = readl(spmi->regs + SPMI_RSP_REG);  in spmi_read_cmd()
84 		while ((len_read < len) && (i < 4)) {  in spmi_read_cmd()
93 static int spmi_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,  in spmi_write_cmd()  argument
94 			  u16 saddr, const u8 *buf, size_t len)  in spmi_write_cmd()  argument
96 	struct apple_spmi *spmi = spmi_controller_get_drvdata(ctrl);  in spmi_write_cmd()
97 	u32 spmi_cmd = apple_spmi_pack_cmd(opc, sid, saddr, len);  in spmi_write_cmd()
101 	writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);  in spmi_write_cmd()
103 	while (i < len) {  in spmi_write_cmd()
106 		while ((j < 4) & (i < len))  in spmi_write_cmd()
109 		writel(spmi_cmd, spmi->regs + SPMI_CMD_REG);  in spmi_write_cmd()
112 	ret = apple_spmi_wait_rx_not_empty(ctrl);  in spmi_write_cmd()
117 	readl(spmi->regs + SPMI_RSP_REG);  in spmi_write_cmd()
125 	struct spmi_controller *ctrl;  in apple_spmi_probe()  local
128 	ctrl = devm_spmi_controller_alloc(&pdev->dev, sizeof(*spmi));  in apple_spmi_probe()
129 	if (IS_ERR(ctrl))  in apple_spmi_probe()
130 		return -ENOMEM;  in apple_spmi_probe()
132 	spmi = spmi_controller_get_drvdata(ctrl);  in apple_spmi_probe()
134 	spmi->regs = devm_platform_ioremap_resource(pdev, 0);  in apple_spmi_probe()
135 	if (IS_ERR(spmi->regs))  in apple_spmi_probe()
136 		return PTR_ERR(spmi->regs);  in apple_spmi_probe()
138 	ctrl->dev.of_node = pdev->dev.of_node;  in apple_spmi_probe()
140 	ctrl->read_cmd = spmi_read_cmd;  in apple_spmi_probe()
141 	ctrl->write_cmd = spmi_write_cmd;  in apple_spmi_probe()
143 	ret = devm_spmi_controller_add(&pdev->dev, ctrl);  in apple_spmi_probe()
145 		return dev_err_probe(&pdev->dev, ret,  in apple_spmi_probe()
160 		.name	= "apple-spmi",
166 MODULE_AUTHOR("Jean-Francois Bortolotti <jeff@borto.fr>");