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-rw-r--r--drivers/ssbi/Kconfig16
-rw-r--r--drivers/ssbi/Makefile1
-rw-r--r--drivers/ssbi/ssbi.c333
3 files changed, 0 insertions, 350 deletions
diff --git a/drivers/ssbi/Kconfig b/drivers/ssbi/Kconfig
deleted file mode 100644
index 1ae4040afedd..000000000000
--- a/drivers/ssbi/Kconfig
+++ /dev/null
@@ -1,16 +0,0 @@
-#
-# SSBI bus support
-#
-
-menu "Qualcomm MSM SSBI bus support"
-
-config SSBI
- tristate "Qualcomm Single-wire Serial Bus Interface (SSBI)"
- help
- If you say yes to this option, support will be included for the
- built-in SSBI interface on Qualcomm MSM family processors.
-
- This is required for communicating with Qualcomm PMICs and
- other devices that have the SSBI interface.
-
-endmenu
diff --git a/drivers/ssbi/Makefile b/drivers/ssbi/Makefile
deleted file mode 100644
index 38fb70c31caf..000000000000
--- a/drivers/ssbi/Makefile
+++ /dev/null
@@ -1 +0,0 @@
-obj-$(CONFIG_SSBI) += ssbi.o
diff --git a/drivers/ssbi/ssbi.c b/drivers/ssbi/ssbi.c
deleted file mode 100644
index 102a22844297..000000000000
--- a/drivers/ssbi/ssbi.c
+++ /dev/null
@@ -1,333 +0,0 @@
-/* Copyright (c) 2009-2013, The Linux Foundation. All rights reserved.
- * Copyright (c) 2010, Google Inc.
- *
- * Original authors: Code Aurora Forum
- *
- * Author: Dima Zavin <dima@android.com>
- * - Largely rewritten from original to not be an i2c driver.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#define pr_fmt(fmt) "%s: " fmt, __func__
-
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/ssbi.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-
-/* SSBI 2.0 controller registers */
-#define SSBI2_CMD 0x0008
-#define SSBI2_RD 0x0010
-#define SSBI2_STATUS 0x0014
-#define SSBI2_MODE2 0x001C
-
-/* SSBI_CMD fields */
-#define SSBI_CMD_RDWRN (1 << 24)
-
-/* SSBI_STATUS fields */
-#define SSBI_STATUS_RD_READY (1 << 2)
-#define SSBI_STATUS_READY (1 << 1)
-#define SSBI_STATUS_MCHN_BUSY (1 << 0)
-
-/* SSBI_MODE2 fields */
-#define SSBI_MODE2_REG_ADDR_15_8_SHFT 0x04
-#define SSBI_MODE2_REG_ADDR_15_8_MASK (0x7f << SSBI_MODE2_REG_ADDR_15_8_SHFT)
-
-#define SET_SSBI_MODE2_REG_ADDR_15_8(MD, AD) \
- (((MD) & 0x0F) | ((((AD) >> 8) << SSBI_MODE2_REG_ADDR_15_8_SHFT) & \
- SSBI_MODE2_REG_ADDR_15_8_MASK))
-
-/* SSBI PMIC Arbiter command registers */
-#define SSBI_PA_CMD 0x0000
-#define SSBI_PA_RD_STATUS 0x0004
-
-/* SSBI_PA_CMD fields */
-#define SSBI_PA_CMD_RDWRN (1 << 24)
-#define SSBI_PA_CMD_ADDR_MASK 0x7fff /* REG_ADDR_7_0, REG_ADDR_8_14*/
-
-/* SSBI_PA_RD_STATUS fields */
-#define SSBI_PA_RD_STATUS_TRANS_DONE (1 << 27)
-#define SSBI_PA_RD_STATUS_TRANS_DENIED (1 << 26)
-
-#define SSBI_TIMEOUT_US 100
-
-struct ssbi {
- struct device *slave;
- void __iomem *base;
- spinlock_t lock;
- enum ssbi_controller_type controller_type;
- int (*read)(struct ssbi *, u16 addr, u8 *buf, int len);
- int (*write)(struct ssbi *, u16 addr, u8 *buf, int len);
-};
-
-#define to_ssbi(dev) platform_get_drvdata(to_platform_device(dev))
-
-static inline u32 ssbi_readl(struct ssbi *ssbi, u32 reg)
-{
- return readl(ssbi->base + reg);
-}
-
-static inline void ssbi_writel(struct ssbi *ssbi, u32 val, u32 reg)
-{
- writel(val, ssbi->base + reg);
-}
-
-/*
- * Via private exchange with one of the original authors, the hardware
- * should generally finish a transaction in about 5us. The worst
- * case, is when using the arbiter and both other CPUs have just
- * started trying to use the SSBI bus will result in a time of about
- * 20us. It should never take longer than this.
- *
- * As such, this wait merely spins, with a udelay.
- */
-static int ssbi_wait_mask(struct ssbi *ssbi, u32 set_mask, u32 clr_mask)
-{
- u32 timeout = SSBI_TIMEOUT_US;
- u32 val;
-
- while (timeout--) {
- val = ssbi_readl(ssbi, SSBI2_STATUS);
- if (((val & set_mask) == set_mask) && ((val & clr_mask) == 0))
- return 0;
- udelay(1);
- }
-
- return -ETIMEDOUT;
-}
-
-static int
-ssbi_read_bytes(struct ssbi *ssbi, u16 addr, u8 *buf, int len)
-{
- u32 cmd = SSBI_CMD_RDWRN | ((addr & 0xff) << 16);
- int ret = 0;
-
- if (ssbi->controller_type == MSM_SBI_CTRL_SSBI2) {
- u32 mode2 = ssbi_readl(ssbi, SSBI2_MODE2);
- mode2 = SET_SSBI_MODE2_REG_ADDR_15_8(mode2, addr);
- ssbi_writel(ssbi, mode2, SSBI2_MODE2);
- }
-
- while (len) {
- ret = ssbi_wait_mask(ssbi, SSBI_STATUS_READY, 0);
- if (ret)
- goto err;
-
- ssbi_writel(ssbi, cmd, SSBI2_CMD);
- ret = ssbi_wait_mask(ssbi, SSBI_STATUS_RD_READY, 0);
- if (ret)
- goto err;
- *buf++ = ssbi_readl(ssbi, SSBI2_RD) & 0xff;
- len--;
- }
-
-err:
- return ret;
-}
-
-static int
-ssbi_write_bytes(struct ssbi *ssbi, u16 addr, u8 *buf, int len)
-{
- int ret = 0;
-
- if (ssbi->controller_type == MSM_SBI_CTRL_SSBI2) {
- u32 mode2 = ssbi_readl(ssbi, SSBI2_MODE2);
- mode2 = SET_SSBI_MODE2_REG_ADDR_15_8(mode2, addr);
- ssbi_writel(ssbi, mode2, SSBI2_MODE2);
- }
-
- while (len) {
- ret = ssbi_wait_mask(ssbi, SSBI_STATUS_READY, 0);
- if (ret)
- goto err;
-
- ssbi_writel(ssbi, ((addr & 0xff) << 16) | *buf, SSBI2_CMD);
- ret = ssbi_wait_mask(ssbi, 0, SSBI_STATUS_MCHN_BUSY);
- if (ret)
- goto err;
- buf++;
- len--;
- }
-
-err:
- return ret;
-}
-
-/*
- * See ssbi_wait_mask for an explanation of the time and the
- * busywait.
- */
-static inline int
-ssbi_pa_transfer(struct ssbi *ssbi, u32 cmd, u8 *data)
-{
- u32 timeout = SSBI_TIMEOUT_US;
- u32 rd_status = 0;
-
- ssbi_writel(ssbi, cmd, SSBI_PA_CMD);
-
- while (timeout--) {
- rd_status = ssbi_readl(ssbi, SSBI_PA_RD_STATUS);
-
- if (rd_status & SSBI_PA_RD_STATUS_TRANS_DENIED)
- return -EPERM;
-
- if (rd_status & SSBI_PA_RD_STATUS_TRANS_DONE) {
- if (data)
- *data = rd_status & 0xff;
- return 0;
- }
- udelay(1);
- }
-
- return -ETIMEDOUT;
-}
-
-static int
-ssbi_pa_read_bytes(struct ssbi *ssbi, u16 addr, u8 *buf, int len)
-{
- u32 cmd;
- int ret = 0;
-
- cmd = SSBI_PA_CMD_RDWRN | (addr & SSBI_PA_CMD_ADDR_MASK) << 8;
-
- while (len) {
- ret = ssbi_pa_transfer(ssbi, cmd, buf);
- if (ret)
- goto err;
- buf++;
- len--;
- }
-
-err:
- return ret;
-}
-
-static int
-ssbi_pa_write_bytes(struct ssbi *ssbi, u16 addr, u8 *buf, int len)
-{
- u32 cmd;
- int ret = 0;
-
- while (len) {
- cmd = (addr & SSBI_PA_CMD_ADDR_MASK) << 8 | *buf;
- ret = ssbi_pa_transfer(ssbi, cmd, NULL);
- if (ret)
- goto err;
- buf++;
- len--;
- }
-
-err:
- return ret;
-}
-
-int ssbi_read(struct device *dev, u16 addr, u8 *buf, int len)
-{
- struct ssbi *ssbi = to_ssbi(dev);
- unsigned long flags;
- int ret;
-
- spin_lock_irqsave(&ssbi->lock, flags);
- ret = ssbi->read(ssbi, addr, buf, len);
- spin_unlock_irqrestore(&ssbi->lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(ssbi_read);
-
-int ssbi_write(struct device *dev, u16 addr, u8 *buf, int len)
-{
- struct ssbi *ssbi = to_ssbi(dev);
- unsigned long flags;
- int ret;
-
- spin_lock_irqsave(&ssbi->lock, flags);
- ret = ssbi->write(ssbi, addr, buf, len);
- spin_unlock_irqrestore(&ssbi->lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(ssbi_write);
-
-static int ssbi_probe(struct platform_device *pdev)
-{
- struct device_node *np = pdev->dev.of_node;
- struct resource *mem_res;
- struct ssbi *ssbi;
- const char *type;
-
- ssbi = devm_kzalloc(&pdev->dev, sizeof(*ssbi), GFP_KERNEL);
- if (!ssbi)
- return -ENOMEM;
-
- mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- ssbi->base = devm_ioremap_resource(&pdev->dev, mem_res);
- if (IS_ERR(ssbi->base))
- return PTR_ERR(ssbi->base);
-
- platform_set_drvdata(pdev, ssbi);
-
- type = of_get_property(np, "qcom,controller-type", NULL);
- if (type == NULL) {
- dev_err(&pdev->dev, "Missing qcom,controller-type property\n");
- return -EINVAL;
- }
- dev_info(&pdev->dev, "SSBI controller type: '%s'\n", type);
- if (strcmp(type, "ssbi") == 0)
- ssbi->controller_type = MSM_SBI_CTRL_SSBI;
- else if (strcmp(type, "ssbi2") == 0)
- ssbi->controller_type = MSM_SBI_CTRL_SSBI2;
- else if (strcmp(type, "pmic-arbiter") == 0)
- ssbi->controller_type = MSM_SBI_CTRL_PMIC_ARBITER;
- else {
- dev_err(&pdev->dev, "Unknown qcom,controller-type\n");
- return -EINVAL;
- }
-
- if (ssbi->controller_type == MSM_SBI_CTRL_PMIC_ARBITER) {
- ssbi->read = ssbi_pa_read_bytes;
- ssbi->write = ssbi_pa_write_bytes;
- } else {
- ssbi->read = ssbi_read_bytes;
- ssbi->write = ssbi_write_bytes;
- }
-
- spin_lock_init(&ssbi->lock);
-
- return of_platform_populate(np, NULL, NULL, &pdev->dev);
-}
-
-static struct of_device_id ssbi_match_table[] = {
- { .compatible = "qcom,ssbi" },
- {}
-};
-MODULE_DEVICE_TABLE(of, ssbi_match_table);
-
-static struct platform_driver ssbi_driver = {
- .probe = ssbi_probe,
- .driver = {
- .name = "ssbi",
- .owner = THIS_MODULE,
- .of_match_table = ssbi_match_table,
- },
-};
-module_platform_driver(ssbi_driver);
-
-MODULE_LICENSE("GPL v2");
-MODULE_VERSION("1.0");
-MODULE_ALIAS("platform:ssbi");
-MODULE_AUTHOR("Dima Zavin <dima@android.com>");
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-15 02:41:49 +0300