22 #include <linux/ssbi.h>
24 /* SSBI 2.0 controller registers */
46 /* SSBI PMIC Arbiter command registers */
66 struct ssbi {  struct
70 	int (*read)(struct ssbi *, u16 addr, u8 *buf, int len);  argument
71 	int (*write)(struct ssbi *, u16 addr, const u8 *buf, int len);  argument
74 static inline u32 ssbi_readl(struct ssbi *ssbi, u32 reg)  in ssbi_readl()  argument
76 	return readl(ssbi->base + reg);  in ssbi_readl()
79 static inline void ssbi_writel(struct ssbi *ssbi, u32 val, u32 reg)  in ssbi_writel()  argument
81 	writel(val, ssbi->base + reg);  in ssbi_writel()
88  * started trying to use the SSBI bus will result in a time of about
93 static int ssbi_wait_mask(struct ssbi *ssbi, u32 set_mask, u32 clr_mask)  in ssbi_wait_mask()  argument
99 		val = ssbi_readl(ssbi, SSBI2_STATUS);  in ssbi_wait_mask()
109 ssbi_read_bytes(struct ssbi *ssbi, u16 addr, u8 *buf, int len)  in ssbi_read_bytes()  argument
114 	if (ssbi->controller_type == MSM_SBI_CTRL_SSBI2) {  in ssbi_read_bytes()
115 		u32 mode2 = ssbi_readl(ssbi, SSBI2_MODE2);  in ssbi_read_bytes()
117 		ssbi_writel(ssbi, mode2, SSBI2_MODE2);  in ssbi_read_bytes()
121 		ret = ssbi_wait_mask(ssbi, SSBI_STATUS_READY, 0);  in ssbi_read_bytes()
125 		ssbi_writel(ssbi, cmd, SSBI2_CMD);  in ssbi_read_bytes()
126 		ret = ssbi_wait_mask(ssbi, SSBI_STATUS_RD_READY, 0);  in ssbi_read_bytes()
129 		*buf++ = ssbi_readl(ssbi, SSBI2_RD) & 0xff;  in ssbi_read_bytes()
138 ssbi_write_bytes(struct ssbi *ssbi, u16 addr, const u8 *buf, int len)  in ssbi_write_bytes()  argument
142 	if (ssbi->controller_type == MSM_SBI_CTRL_SSBI2) {  in ssbi_write_bytes()
143 		u32 mode2 = ssbi_readl(ssbi, SSBI2_MODE2);  in ssbi_write_bytes()
145 		ssbi_writel(ssbi, mode2, SSBI2_MODE2);  in ssbi_write_bytes()
149 		ret = ssbi_wait_mask(ssbi, SSBI_STATUS_READY, 0);  in ssbi_write_bytes()
153 		ssbi_writel(ssbi, ((addr & 0xff) << 16) | *buf, SSBI2_CMD);  in ssbi_write_bytes()
154 		ret = ssbi_wait_mask(ssbi, 0, SSBI_STATUS_MCHN_BUSY);  in ssbi_write_bytes()
170 ssbi_pa_transfer(struct ssbi *ssbi, u32 cmd, u8 *data)  in ssbi_pa_transfer()  argument
175 	ssbi_writel(ssbi, cmd, SSBI_PA_CMD);  in ssbi_pa_transfer()
178 		rd_status = ssbi_readl(ssbi, SSBI_PA_RD_STATUS);  in ssbi_pa_transfer()
195 ssbi_pa_read_bytes(struct ssbi *ssbi, u16 addr, u8 *buf, int len)  in ssbi_pa_read_bytes()  argument
203 		ret = ssbi_pa_transfer(ssbi, cmd, buf);  in ssbi_pa_read_bytes()
215 ssbi_pa_write_bytes(struct ssbi *ssbi, u16 addr, const u8 *buf, int len)  in ssbi_pa_write_bytes()  argument
222 		ret = ssbi_pa_transfer(ssbi, cmd, NULL);  in ssbi_pa_write_bytes()
235 	struct ssbi *ssbi = dev_get_drvdata(dev);  in ssbi_read()  local
239 	spin_lock_irqsave(&ssbi->lock, flags);  in ssbi_read()
240 	ret = ssbi->read(ssbi, addr, buf, len);  in ssbi_read()
241 	spin_unlock_irqrestore(&ssbi->lock, flags);  in ssbi_read()
249 	struct ssbi *ssbi = dev_get_drvdata(dev);  in ssbi_write()  local
253 	spin_lock_irqsave(&ssbi->lock, flags);  in ssbi_write()
254 	ret = ssbi->write(ssbi, addr, buf, len);  in ssbi_write()
255 	spin_unlock_irqrestore(&ssbi->lock, flags);  in ssbi_write()
264 	struct ssbi *ssbi;  in ssbi_probe()  local
267 	ssbi = devm_kzalloc(&pdev->dev, sizeof(*ssbi), GFP_KERNEL);  in ssbi_probe()
268 	if (!ssbi)  in ssbi_probe()
271 	ssbi->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);  in ssbi_probe()
272 	if (IS_ERR(ssbi->base))  in ssbi_probe()
273 		return PTR_ERR(ssbi->base);  in ssbi_probe()
275 	platform_set_drvdata(pdev, ssbi);  in ssbi_probe()
282 	dev_info(&pdev->dev, "SSBI controller type: '%s'\n", type);  in ssbi_probe()
283 	if (strcmp(type, "ssbi") == 0)  in ssbi_probe()
284 		ssbi->controller_type = MSM_SBI_CTRL_SSBI;  in ssbi_probe()
286 		ssbi->controller_type = MSM_SBI_CTRL_SSBI2;  in ssbi_probe()
288 		ssbi->controller_type = MSM_SBI_CTRL_PMIC_ARBITER;  in ssbi_probe()
294 	if (ssbi->controller_type == MSM_SBI_CTRL_PMIC_ARBITER) {  in ssbi_probe()
295 		ssbi->read = ssbi_pa_read_bytes;  in ssbi_probe()
296 		ssbi->write = ssbi_pa_write_bytes;  in ssbi_probe()
298 		ssbi->read = ssbi_read_bytes;  in ssbi_probe()
299 		ssbi->write = ssbi_write_bytes;  in ssbi_probe()
302 	spin_lock_init(&ssbi->lock);  in ssbi_probe()
308 	{ .compatible = "qcom,ssbi" },
316 		.name	= "ssbi",
322 MODULE_DESCRIPTION("Qualcomm Single-wire Serial Bus Interface (SSBI) driver");
325 MODULE_ALIAS("platform:ssbi");