The DCC is a DMA Engine designed to capture and store data
during system crash or software triggers.The DCC operates
based on link list entries which provides it with data and
addresses and the function it needs to perform.These functions
are read,write and loop.Added the basic driver in this patch
which contains a probe method which instantiates all the link
list data specific to a SoC.Methods have also been added to
handle all the functionalities specific to a linked list.Each
DCC has it's own SRAM which needs to be instantiated at probe
time as well.
Signed-off-by: Souradeep Chowdhury <schow...@codeaurora.org>
---
drivers/soc/qcom/Kconfig | 8 +
drivers/soc/qcom/Makefile | 1 +
drivers/soc/qcom/dcc.c | 1055 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1064 insertions(+)
create mode 100644 drivers/soc/qcom/dcc.c
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 79b568f..8819e0b 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -69,6 +69,14 @@ config QCOM_LLCC
SDM845. This provides interfaces to clients that use the LLCC.
Say yes here to enable LLCC slice driver.
+config QCOM_DCC
+ tristate "Qualcomm Technologies, Inc. Data Capture and Compare engine
driver"
+ depends on ARCH_QCOM || COMPILE_TEST
+ help
+ This option enables driver for Data Capture and Compare engine. DCC
+ driver provides interface to configure DCC block and read back
+ captured data from DCC's internal SRAM.
+
config QCOM_KRYO_L2_ACCESSORS
bool
depends on ARCH_QCOM && ARM64 || COMPILE_TEST
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index ad675a6..1b00870 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -26,3 +26,4 @@ obj-$(CONFIG_QCOM_LLCC) += llcc-qcom.o
obj-$(CONFIG_QCOM_RPMHPD) += rpmhpd.o
obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o
obj-$(CONFIG_QCOM_KRYO_L2_ACCESSORS) += kryo-l2-accessors.o
+obj-$(CONFIG_QCOM_DCC) += dcc.o
diff --git a/drivers/soc/qcom/dcc.c b/drivers/soc/qcom/dcc.c
new file mode 100644
index 0000000..d67452b
--- /dev/null
+++ b/drivers/soc/qcom/dcc.c
@@ -0,0 +1,1055 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/bitops.h>
+#include <linux/cdev.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#define TIMEOUT_US 100
+
+#define BM(lsb, msb) ((BIT(msb) - BIT(lsb)) + BIT(msb))
+#define BMVAL(val, lsb, msb) ((val & BM(lsb, msb)) >> lsb)
+#define BVAL(val, n) ((val & BIT(n)) >> n)
+
+#define dcc_writel(drvdata, val, off) \
+ writel((val), drvdata->base + dcc_offset_conv(drvdata, off))
+#define dcc_readl(drvdata, off)
\
+ readl(drvdata->base + dcc_offset_conv(drvdata, off))
+
+#define dcc_sram_readl(drvdata, off) \
+ readl(drvdata->ram_base + off)
+
+/* DCC registers */
+#define DCC_HW_INFO 0x04
+#define DCC_LL_NUM_INFO 0x10
+#define DCC_STATUS 0x1C
+#define DCC_LL_LOCK(m) (0x34 + 0x80 * m)
+#define DCC_LL_CFG(m) (0x38 + 0x80 * m)
+#define DCC_LL_BASE(m) (0x3c + 0x80 * m)
+#define DCC_FD_BASE(m) (0x40 + 0x80 * m)
+#define DCC_LL_TIMEOUT(m) (0x44 + 0x80 * m)
+#define DCC_LL_INT_ENABLE(m) (0x4C + 0x80 * m)
+#define DCC_LL_INT_STATUS(m) (0x50 + 0x80 * m)
+#define DCC_LL_SW_TRIGGER(m) (0x60 + 0x80 * m)
+#define DCC_LL_BUS_ACCESS_STATUS(m) (0x64 + 0x80 * m)
+
+#define DCC_MAP_LEVEL1 0x18
+#define DCC_MAP_LEVEL2 0x34
+#define DCC_MAP_LEVEL3 0x4C
+
+#define DCC_MAP_OFFSET1 0x10
+#define DCC_MAP_OFFSET2 0x18
+#define DCC_MAP_OFFSET3 0x1C
+#define DCC_MAP_OFFSET4 0x8
+
+#define DCC_FIX_LOOP_OFFSET 16
+#define DCC_VER_INFO_BIT 9
+
+#define DCC_READ 0
+#define DCC_WRITE 1
+#define DCC_LOOP 2
+#define DCC_READ_WRITE 3
+
+#define MAX_DCC_OFFSET (0xFF * 4)
+#define MAX_DCC_LEN 0x7F
+#define MAX_LOOP_CNT 0xFF
+
+#define DCC_ADDR_DESCRIPTOR 0x00
+#define DCC_LOOP_DESCRIPTOR (BIT(30))
+#define DCC_RD_MOD_WR_DESCRIPTOR (BIT(31))
+#define DCC_LINK_DESCRIPTOR (BIT(31) | BIT(30))
+
+#define DCC_READ_IND 0x00
+#define DCC_WRITE_IND (BIT(28))
+
+#define DCC_AHB_IND 0x00
+#define DCC_APB_IND BIT(29)
+
+#define DCC_MAX_LINK_LIST 8
+#define DCC_INVALID_LINK_LIST 0xFF
+
+#define DCC_VER_MASK1 0x7F
+#define DCC_VER_MASK2 0x3F
+
+#define DCC_RD_MOD_WR_ADDR 0xC105E
+
+struct qcom_dcc_config {
+ const int dcc_ram_offset;
+};
+
+static const struct qcom_dcc_config sm8150_cfg = {
+ .dcc_ram_offset = 0x5000,
+};
+
+enum dcc_descriptor_type {
+ DCC_ADDR_TYPE,
+ DCC_LOOP_TYPE,
+ DCC_READ_WRITE_TYPE,
+ DCC_WRITE_TYPE
+};
+
+enum dcc_mem_map_ver {
+ DCC_MEM_MAP_VER1,
+ DCC_MEM_MAP_VER2,
+ DCC_MEM_MAP_VER3
+};
+
+struct dcc_config_entry {
+ u32 base;
+ u32 offset;
+ u32 len;
+ u32 index;
+ u32 loop_cnt;
+ u32 write_val;
+ u32 mask;
+ bool apb_bus;
+ enum dcc_descriptor_type desc_type;
+ struct list_head list;
+};
+
+struct dcc_drvdata {
+ void __iomem *base;
+ u32 reg_size;
+ struct device *dev;
+ struct mutex mutex;
+ void __iomem *ram_base;
+ u32 ram_size;
+ u32 ram_offset;
+ enum dcc_mem_map_ver mem_map_ver;
+ u32 ram_cfg;
+ u32 ram_start;
+ bool *enable;
+ bool *configured;
+ bool interrupt_disable;
+ char *sram_node;
+ struct cdev sram_dev;
+ struct class *sram_class;
+ struct list_head *cfg_head;
+ u32 *nr_config;
+ u32 nr_link_list;
+ u8 curr_list;
+ u8 loopoff;
+};
+
+struct dcc_cfg_attr {
+ u32 addr;
+ u32 prev_addr;
+ u32 prev_off;
+ u32 link;
+ u32 sram_offset;
+};
+
+struct dcc_cfg_loop_attr {
+ u32 loop;
+ bool loop_start;
+ u32 loop_cnt;
+ u32 loop_len;
+ u32 loop_off;
+};
+
+static u32 dcc_offset_conv(struct dcc_drvdata *drvdata, u32 off)
+{
+ if (drvdata->mem_map_ver == DCC_MEM_MAP_VER1) {
+ if ((off & DCC_VER_MASK1) >= DCC_MAP_LEVEL3)
+ return (off - DCC_MAP_OFFSET3);
+ if ((off & DCC_VER_MASK1) >= DCC_MAP_LEVEL2)
+ return (off - DCC_MAP_OFFSET2);
+ else if ((off & DCC_VER_MASK1) >= DCC_MAP_LEVEL1)
+ return (off - DCC_MAP_OFFSET1);
+ } else if (drvdata->mem_map_ver == DCC_MEM_MAP_VER2) {
+ if ((off & DCC_VER_MASK1) >= DCC_MAP_LEVEL2)
+ return (off - DCC_MAP_OFFSET4);
+ }
+ return off;
+}
+
+static int dcc_sram_writel(struct dcc_drvdata *drvdata,
+ u32 val, u32 off)
+{
+ if (unlikely(off > (drvdata->ram_size - 4)))
+ return -EINVAL;
+
+ writel((val), drvdata->ram_base + off);
+
+ return 0;
+}
+
+static int _dcc_ll_cfg_read_write(struct dcc_drvdata *drvdata,
+struct dcc_config_entry *entry, struct dcc_cfg_attr *cfg)
+{
+ int ret = 0;
+
+ if (cfg->link) {
+ /* write new offset = 1 to continue
+ * processing the list
+ */
+
+ ret = dcc_sram_writel(drvdata, cfg->link, cfg->sram_offset);
+ if (ret)
+ return ret;
+ cfg->sram_offset += 4;
+ /* Reset link and prev_off */
+ cfg->addr = 0x00;
+ cfg->link = 0;
+ cfg->prev_off = 0;
+ cfg->prev_addr = cfg->addr;
+ }
+
+ cfg->addr = DCC_RD_MOD_WR_DESCRIPTOR;
+
+ ret = dcc_sram_writel(drvdata, cfg->addr, cfg->sram_offset);
+
+ if (ret)
+ return ret;
+
+ cfg->sram_offset += 4;
+
+ ret = dcc_sram_writel(drvdata, entry->mask, cfg->sram_offset);
+
+ if (ret)
+ return ret;
+
+ cfg->sram_offset += 4;
+
+ ret = dcc_sram_writel(drvdata, entry->write_val, cfg->sram_offset);
+
+ if (ret)
+ return ret;
+
+ cfg->sram_offset += 4;
+
+ cfg->addr = 0;
+
+ return ret;
+}
+
+static int _dcc_ll_cfg_loop(struct dcc_drvdata *drvdata, struct
dcc_config_entry *entry,
+struct dcc_cfg_attr *cfg, struct dcc_cfg_loop_attr *cfg_loop, u32 *total_len)
+{
+
+ int ret = 0;
+
+ /* Check if we need to write link of prev entry */
+ if (cfg->link) {
+ ret = dcc_sram_writel(drvdata, cfg->link, cfg->sram_offset);
+ if (ret)
+ return ret;
+ cfg->sram_offset += 4;
+ }
+
+ if (cfg_loop->loop_start) {
+ cfg_loop->loop = (cfg->sram_offset - cfg_loop->loop_off) / 4;
+ cfg_loop->loop |= (cfg_loop->loop_cnt << drvdata->loopoff) &
+ BM(drvdata->loopoff, 27);
+ cfg_loop->loop |= DCC_LOOP_DESCRIPTOR;
+ *total_len += (*total_len - cfg_loop->loop_len) *
cfg_loop->loop_cnt;
+
+ ret = dcc_sram_writel(drvdata, cfg_loop->loop,
cfg->sram_offset);
+
+ if (ret)
+ return ret;
+ cfg->sram_offset += 4;
+
+ cfg_loop->loop_start = false;
+ cfg_loop->loop_len = 0;
+ cfg_loop->loop_off = 0;
+ } else {
+ cfg_loop->loop_start = true;
+ cfg_loop->loop_cnt = entry->loop_cnt - 1;
+ cfg_loop->loop_len = *total_len;
+ cfg_loop->loop_off = cfg->sram_offset;
+ }
+
+ /* Reset link and prev_off */
+
+ cfg->addr = 0x00;
+ cfg->link = 0;
+ cfg->prev_off = 0;
+ cfg->prev_addr = cfg->addr;
+
+ return ret;
+}
+
+static int _dcc_ll_cfg_write(struct dcc_drvdata *drvdata,
+struct dcc_config_entry *entry, struct dcc_cfg_attr *cfg, u32 *total_len)
+{
+ u32 off;
+ int ret = 0;
+
+ if (cfg->link) {
+ /* write new offset = 1 to continue
+ * processing the list
+ */
+ ret = dcc_sram_writel(drvdata, cfg->link, cfg->sram_offset);
+
+ if (ret)
+ return ret;
+
+ cfg->sram_offset += 4;
+ /* Reset link and prev_off */
+ cfg->addr = 0x00;
+ cfg->prev_off = 0;
+ cfg->prev_addr = cfg->addr;
+ }
+
+ off = entry->offset/4;
+ /* write new offset-length pair to correct position */
+ cfg->link |= ((off & BM(0, 7)) | BIT(15) | ((entry->len << 8) & BM(8,
14)));
+ cfg->link |= DCC_LINK_DESCRIPTOR;
+
+ /* Address type */
+ cfg->addr = (entry->base >> 4) & BM(0, 27);
+ if (entry->apb_bus)
+ cfg->addr |= DCC_ADDR_DESCRIPTOR | DCC_WRITE_IND | DCC_APB_IND;
+ else
+ cfg->addr |= DCC_ADDR_DESCRIPTOR | DCC_WRITE_IND | DCC_AHB_IND;
+ ret = dcc_sram_writel(drvdata, cfg->addr, cfg->sram_offset);
+
+ if (ret)
+ return ret;
+ cfg->sram_offset += 4;
+
+ ret = dcc_sram_writel(drvdata, cfg->link, cfg->sram_offset);
+ if (ret)
+ return ret;
+ cfg->sram_offset += 4;
+
+ ret = dcc_sram_writel(drvdata, entry->write_val, cfg->sram_offset);
+
+ if (ret)
+ return ret;
+
+ cfg->sram_offset += 4;
+ cfg->addr = 0x00;
+ cfg->link = 0;
+ return ret;
+}
+
+static int _dcc_ll_cfg_default(struct dcc_drvdata *drvdata,
+struct dcc_config_entry *entry, struct dcc_cfg_attr *cfg, u32 *pos, u32
*total_len)
+{
+ int ret = 0;
+ u32 off;
+
+ cfg->addr = (entry->base >> 4) & BM(0, 27);
+
+ if (entry->apb_bus)
+ cfg->addr |= DCC_ADDR_DESCRIPTOR | DCC_READ_IND | DCC_APB_IND;
+ else
+ cfg->addr |= DCC_ADDR_DESCRIPTOR | DCC_READ_IND | DCC_AHB_IND;
+
+ off = entry->offset/4;
+
+ *total_len += entry->len * 4;
+
+ if (!cfg->prev_addr || cfg->prev_addr != cfg->addr || cfg->prev_off >
off) {
+ /* Check if we need to write prev link entry */
+ if (cfg->link) {
+ ret = dcc_sram_writel(drvdata, cfg->link,
cfg->sram_offset);
+ if (ret)
+ return ret;
+ cfg->sram_offset += 4;
+ }
+ dev_dbg(drvdata->dev, "DCC: sram address 0x%x\n",
cfg->sram_offset);
+
+ /* Write address */
+ ret = dcc_sram_writel(drvdata, cfg->addr, cfg->sram_offset);
+
+ if (ret)
+ return ret;
+
+ cfg->sram_offset += 4;
+
+ /* Reset link and prev_off */
+ cfg->link = 0;
+ cfg->prev_off = 0;
+ }
+
+ if ((off - cfg->prev_off) > 0xFF || entry->len > MAX_DCC_LEN) {
+ dev_err(drvdata->dev, "DCC: Programming error Base: 0x%x,
offset 0x%x\n",
+ entry->base, entry->offset);
+ ret = -EINVAL;
+ return ret;
+ }
+
+ if (cfg->link) {
+ /*
+ * link already has one offset-length so new
+ * offset-length needs to be placed at
+ * bits [29:15]
+ */
+ *pos = 15;
+
+ /* Clear bits [31:16] */
+ cfg->link &= BM(0, 14);
+ } else {
+ /*
+ * link is empty, so new offset-length needs
+ * to be placed at bits [15:0]
+ */
+ *pos = 0;
+ cfg->link = 1 << 15;
+ }
+
+ /* write new offset-length pair to correct position */
+ cfg->link |= (((off-cfg->prev_off) & BM(0, 7)) | ((entry->len << 8) &
BM(8, 14))) << *pos;
+
+ cfg->link |= DCC_LINK_DESCRIPTOR;
+
+ if (*pos) {
+ ret = dcc_sram_writel(drvdata, cfg->link, cfg->sram_offset);
+ if (ret)
+ return ret;
+ cfg->sram_offset += 4;
+ cfg->link = 0;
+ }
+
+ cfg->prev_off = off + entry->len - 1;
+ cfg->prev_addr = cfg->addr;
+ return ret;
+}
+
+static int __dcc_ll_cfg(struct dcc_drvdata *drvdata, int curr_list)
+{
+ int ret = 0;
+ u32 total_len, pos;
+ struct dcc_config_entry *entry;
+ struct dcc_cfg_attr cfg;
+ struct dcc_cfg_loop_attr cfg_loop;
+
+ cfg.sram_offset = drvdata->ram_cfg * 4;
+ cfg.prev_off = 0;
+ cfg_loop.loop_off = 0;
+ total_len = 0;
+ cfg_loop.loop_len = 0;
+ cfg_loop.loop_cnt = 0;
+ cfg_loop.loop_start = false;
+ cfg.prev_addr = 0;
+ cfg.addr = 0;
+ cfg.link = 0;
+
+ list_for_each_entry(entry, &drvdata->cfg_head[curr_list], list) {
+ switch (entry->desc_type) {
+ case DCC_READ_WRITE_TYPE:
+ {
+ ret = _dcc_ll_cfg_read_write(drvdata, entry, &cfg);
+ if (ret)
+ goto overstep;
+ break;
+ }
+
+ case DCC_LOOP_TYPE:
+ {
+
+ ret = _dcc_ll_cfg_loop(drvdata, entry, &cfg, &cfg_loop,
&total_len);
+
+ if (ret)
+ goto overstep;
+ break;
+ }
+
+ case DCC_WRITE_TYPE:
+ {
+ ret = _dcc_ll_cfg_write(drvdata, entry, &cfg,
&total_len);
+
+ if (ret)
+ goto overstep;
+ break;
+ }
+
+ default:
+ {
+ ret = _dcc_ll_cfg_default(drvdata, entry, &cfg, &pos,
&total_len);
+
+
+ if (ret)
+ goto overstep;
+ break;
+ }
+ }
+ }
+
+ if (cfg.link) {
+ ret = dcc_sram_writel(drvdata, cfg.link, cfg.sram_offset);
+ if (ret)
+ goto overstep;
+ cfg.sram_offset += 4;
+ }
+
+ if (cfg_loop.loop_start) {
+ dev_err(drvdata->dev, "DCC: Programming error: Loop
unterminated\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ /* Handling special case of list ending with a rd_mod_wr */
+ if (cfg.addr == DCC_RD_MOD_WR_DESCRIPTOR) {
+ cfg.addr = (DCC_RD_MOD_WR_ADDR) & BM(0, 27);
+ cfg.addr |= DCC_ADDR_DESCRIPTOR;
+
+ ret = dcc_sram_writel(drvdata, cfg.addr, cfg.sram_offset);
+ if (ret)
+ goto overstep;
+ cfg.sram_offset += 4;
+ }
+
+ /* Setting zero to indicate end of the list */
+ cfg.link = DCC_LINK_DESCRIPTOR;
+ ret = dcc_sram_writel(drvdata, cfg.link, cfg.sram_offset);
+ if (ret)
+ goto overstep;
+ cfg.sram_offset += 4;
+
+ /* Update ram_cfg and check if the data will overstep */
+
+ drvdata->ram_cfg = (cfg.sram_offset + total_len) / 4;
+
+ if (cfg.sram_offset + total_len > drvdata->ram_size) {
+ cfg.sram_offset += total_len;
+ goto overstep;
+ }
+
+ drvdata->ram_start = cfg.sram_offset/4;
+ return 0;
+overstep:
+ ret = -EINVAL;
+ memset_io(drvdata->ram_base, 0, drvdata->ram_size);
+ dev_err(drvdata->dev, "DCC SRAM oversteps, 0x%x (0x%x)\n",
+ cfg.sram_offset, drvdata->ram_size);
+
+err:
+ return ret;
+}
+
+static int dcc_valid_list(struct dcc_drvdata *drvdata, int curr_list)
+{
+ u32 lock_reg;
+
+ if (list_empty(&drvdata->cfg_head[curr_list]))
+ return -EINVAL;
+
+ if (drvdata->enable[curr_list]) {
+ dev_err(drvdata->dev, "List %d is already enabled\n",
+ curr_list);
+ return -EINVAL;
+ }
+
+ lock_reg = dcc_readl(drvdata, DCC_LL_LOCK(curr_list));
+ if (lock_reg & 0x1) {
+ dev_err(drvdata->dev, "List %d is already locked\n",
+ curr_list);
+ return -EINVAL;
+ }
+
+ dev_err(drvdata->dev, "DCC list passed %d\n", curr_list);
+ return 0;
+}
+
+static bool is_dcc_enabled(struct dcc_drvdata *drvdata)
+{
+ bool dcc_enable = false;
+ int list;
+
+ for (list = 0; list < DCC_MAX_LINK_LIST; list++) {
+ if (drvdata->enable[list]) {
+ dcc_enable = true;
+ break;
+ }
+ }
+
+ return dcc_enable;
+}
+
+static int dcc_enable(struct dcc_drvdata *drvdata)
+{
+ int ret = 0;
+ int list;
+ u32 ram_cfg_base;
+
+ mutex_lock(&drvdata->mutex);
+
+ if (!is_dcc_enabled(drvdata)) {
+ memset_io(drvdata->ram_base,
+ 0xDE, drvdata->ram_size);
+ }
+
+ for (list = 0; list < drvdata->nr_link_list; list++) {
+
+ if (dcc_valid_list(drvdata, list))
+ continue;
+
+ /* 1. Take ownership of the list */
+ dcc_writel(drvdata, BIT(0), DCC_LL_LOCK(list));
+
+ /* 2. Program linked-list in the SRAM */
+ ram_cfg_base = drvdata->ram_cfg;
+ ret = __dcc_ll_cfg(drvdata, list);
+ if (ret) {
+ dcc_writel(drvdata, 0, DCC_LL_LOCK(list));
+ dev_info(drvdata->dev, "DCC ram programming failed\n");
+ goto err;
+ }
+
+ /* 3. program DCC_RAM_CFG reg */
+ dcc_writel(drvdata, ram_cfg_base +
+ drvdata->ram_offset/4, DCC_LL_BASE(list));
+ dcc_writel(drvdata, drvdata->ram_start +
+ drvdata->ram_offset/4, DCC_FD_BASE(list));
+ dcc_writel(drvdata, 0xFFF, DCC_LL_TIMEOUT(list));
+
+ /* 4. Clears interrupt status register */
+ dcc_writel(drvdata, 0, DCC_LL_INT_ENABLE(list));
+ dcc_writel(drvdata, (BIT(0) | BIT(1) | BIT(2)),
+ DCC_LL_INT_STATUS(list));
+
+ dev_info(drvdata->dev, "All values written to enable.\n");
+ /* Make sure all config is written in sram */
+ mb();
+
+ drvdata->enable[list] = true;
+
+ /* 5. Configure trigger */
+ dcc_writel(drvdata, BIT(9), DCC_LL_CFG(list));
+ }
+
+err:
+ mutex_unlock(&drvdata->mutex);
+ return ret;
+}
+
+static int dcc_config_add(struct dcc_drvdata *drvdata, unsigned int addr,
+ unsigned int len, int apb_bus)
+{
+ int ret;
+ struct dcc_config_entry *entry, *pentry;
+ unsigned int base, offset;
+
+ mutex_lock(&drvdata->mutex);
+
+ if (drvdata->curr_list >= drvdata->nr_link_list) {
+ dev_err(drvdata->dev, "Select link list to program using
curr_list\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ if (!len || len > (drvdata->ram_size / 8)) {
+ dev_err(drvdata->dev, "DCC: Invalid length\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ base = addr & BM(4, 31);
+
+ if (!list_empty(&drvdata->cfg_head[drvdata->curr_list])) {
+ pentry = list_last_entry(&drvdata->cfg_head[drvdata->curr_list],
+ struct dcc_config_entry, list);
+
+ if (pentry->desc_type == DCC_ADDR_TYPE &&
+ addr >= (pentry->base + pentry->offset) &&
+ addr <= (pentry->base +
+ pentry->offset + MAX_DCC_OFFSET)) {
+
+ /* Re-use base address from last entry */
+ base = pentry->base;
+
+ if ((pentry->len * 4 + pentry->base + pentry->offset)
+ == addr) {
+ len += pentry->len;
+
+ if (len > MAX_DCC_LEN)
+ pentry->len = MAX_DCC_LEN;
+ else
+ pentry->len = len;
+
+ addr = pentry->base + pentry->offset +
+ pentry->len * 4;
+ len -= pentry->len;
+ }
+ }
+ }
+
+ offset = addr - base;
+
+ while (len) {
+ entry = devm_kzalloc(drvdata->dev, sizeof(*entry), GFP_KERNEL);
+ if (!entry) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ entry->base = base;
+ entry->offset = offset;
+ entry->len = min_t(u32, len, MAX_DCC_LEN);
+ entry->index = drvdata->nr_config[drvdata->curr_list]++;
+ entry->desc_type = DCC_ADDR_TYPE;
+ entry->apb_bus = apb_bus;
+ INIT_LIST_HEAD(&entry->list);
+ list_add_tail(&entry->list,
+ &drvdata->cfg_head[drvdata->curr_list]);
+
+ len -= entry->len;
+ offset += MAX_DCC_LEN * 4;
+ }
+
+ mutex_unlock(&drvdata->mutex);
+ return 0;
+err:
+ mutex_unlock(&drvdata->mutex);
+ return ret;
+}
+
+static void dcc_config_reset(struct dcc_drvdata *drvdata)
+{
+ struct dcc_config_entry *entry, *temp;
+ int curr_list;
+
+ mutex_lock(&drvdata->mutex);
+
+ for (curr_list = 0; curr_list < drvdata->nr_link_list; curr_list++) {
+
+ list_for_each_entry_safe(entry, temp,
+ &drvdata->cfg_head[curr_list], list) {
+ list_del(&entry->list);
+ devm_kfree(drvdata->dev, entry);
+ drvdata->nr_config[curr_list]--;
+ }
+ }
+ drvdata->ram_start = 0;
+ drvdata->ram_cfg = 0;
+ mutex_unlock(&drvdata->mutex);
+}
+
+static int dcc_add_loop(struct dcc_drvdata *drvdata, unsigned long loop_cnt)
+{
+ struct dcc_config_entry *entry;
+
+ entry = devm_kzalloc(drvdata->dev, sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ entry->loop_cnt = min_t(u32, loop_cnt, MAX_LOOP_CNT);
+ entry->index = drvdata->nr_config[drvdata->curr_list]++;
+ entry->desc_type = DCC_LOOP_TYPE;
+ INIT_LIST_HEAD(&entry->list);
+ list_add_tail(&entry->list, &drvdata->cfg_head[drvdata->curr_list]);
+
+ return 0;
+}
+
+static int dcc_rd_mod_wr_add(struct dcc_drvdata *drvdata, unsigned int mask,
+ unsigned int val)
+{
+ int ret = 0;
+ struct dcc_config_entry *entry;
+
+ mutex_lock(&drvdata->mutex);
+
+ if (drvdata->curr_list >= drvdata->nr_link_list) {
+ dev_err(drvdata->dev, "Select link list to program using
curr_list\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ if (list_empty(&drvdata->cfg_head[drvdata->curr_list])) {
+ dev_err(drvdata->dev, "DCC: No read address programmed\n");
+ ret = -EPERM;
+ goto err;
+ }
+
+ entry = devm_kzalloc(drvdata->dev, sizeof(*entry), GFP_KERNEL);
+ if (!entry) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ entry->desc_type = DCC_READ_WRITE_TYPE;
+ entry->mask = mask;
+ entry->write_val = val;
+ entry->index = drvdata->nr_config[drvdata->curr_list]++;
+ INIT_LIST_HEAD(&entry->list);
+ list_add_tail(&entry->list, &drvdata->cfg_head[drvdata->curr_list]);
+err:
+ mutex_unlock(&drvdata->mutex);
+ return ret;
+}
+
+static int dcc_add_write(struct dcc_drvdata *drvdata, unsigned int addr,
+ unsigned int write_val, int apb_bus)
+{
+ struct dcc_config_entry *entry;
+
+ entry = devm_kzalloc(drvdata->dev, sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ entry->desc_type = DCC_WRITE_TYPE;
+ entry->base = addr & BM(4, 31);
+ entry->offset = addr - entry->base;
+ entry->write_val = write_val;
+ entry->index = drvdata->nr_config[drvdata->curr_list]++;
+ entry->len = 1;
+ entry->apb_bus = apb_bus;
+ INIT_LIST_HEAD(&entry->list);
+ list_add_tail(&entry->list, &drvdata->cfg_head[drvdata->curr_list]);
+
+ return 0;
+}
+
+static int dcc_sram_open(struct inode *inode, struct file *file)
+{
+ struct dcc_drvdata *drvdata = container_of(inode->i_cdev,
+ struct dcc_drvdata,
+ sram_dev);
+ file->private_data = drvdata;
+
+ return 0;
+}
+
+static ssize_t dcc_sram_read(struct file *file, char __user *data,
+ size_t len, loff_t *ppos)
+{
+ unsigned char *buf;
+ struct dcc_drvdata *drvdata = file->private_data;
+
+ /* EOF check */
+ if (drvdata->ram_size <= *ppos)
+ return 0;
+
+ if ((*ppos + len) > drvdata->ram_size)
+ len = (drvdata->ram_size - *ppos);
+
+ buf = kzalloc(len, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ memcpy_fromio(buf, (drvdata->ram_base + *ppos), len);
+
+ if (copy_to_user(data, buf, len)) {
+ dev_err(drvdata->dev, "DCC: Couldn't copy all data to user\n");
+ kfree(buf);
+ return -EFAULT;
+ }
+
+ *ppos += len;
+
+ kfree(buf);
+
+ return len;
+}
+
+static const struct file_operations dcc_sram_fops = {
+ .owner = THIS_MODULE,
+ .open = dcc_sram_open,
+ .read = dcc_sram_read,
+ .llseek = no_llseek,
+};
+
+static int dcc_sram_dev_register(struct dcc_drvdata *drvdata)
+{
+ int ret;
+ struct device *device;
+ dev_t dev;
+
+ ret = alloc_chrdev_region(&dev, 0, 1, drvdata->sram_node);
+ if (ret)
+ goto err_alloc;
+
+ cdev_init(&drvdata->sram_dev, &dcc_sram_fops);
+
+ drvdata->sram_dev.owner = THIS_MODULE;
+ ret = cdev_add(&drvdata->sram_dev, dev, 1);
+ if (ret)
+ goto err_cdev_add;
+
+ drvdata->sram_class = class_create(THIS_MODULE, drvdata->sram_node);
+ if (IS_ERR(drvdata->sram_class)) {
+ ret = PTR_ERR(drvdata->sram_class);
+ goto err_class_create;
+ }
+
+ device = device_create(drvdata->sram_class, NULL,
+ drvdata->sram_dev.dev, drvdata,
+ drvdata->sram_node);
+ if (IS_ERR(device)) {
+ ret = PTR_ERR(device);
+ goto err_dev_create;
+ }
+
+ return 0;
+err_dev_create:
+ class_destroy(drvdata->sram_class);
+err_class_create:
+ cdev_del(&drvdata->sram_dev);
+err_cdev_add:
+ unregister_chrdev_region(drvdata->sram_dev.dev, 1);
+err_alloc:
+ return ret;
+}
+
+static void dcc_sram_dev_deregister(struct dcc_drvdata *drvdata)
+{
+ device_destroy(drvdata->sram_class, drvdata->sram_dev.dev);
+ class_destroy(drvdata->sram_class);
+ cdev_del(&drvdata->sram_dev);
+ unregister_chrdev_region(drvdata->sram_dev.dev, 1);
+}
+
+static int dcc_sram_dev_init(struct dcc_drvdata *drvdata)
+{
+ int ret = 0;
+ size_t node_size;
+ char *node_name = "dcc_sram";
+ struct device *dev = drvdata->dev;
+
+ node_size = strlen(node_name) + 1;
+
+ drvdata->sram_node = devm_kzalloc(dev, node_size, GFP_KERNEL);
+ if (!drvdata->sram_node)
+ return -ENOMEM;
+
+ strlcpy(drvdata->sram_node, node_name, node_size);
+ ret = dcc_sram_dev_register(drvdata);
+ if (ret)
+ dev_err(drvdata->dev, "DCC: sram node not registered.\n");
+
+ return ret;
+}
+
+static void dcc_sram_dev_exit(struct dcc_drvdata *drvdata)
+{
+ dcc_sram_dev_deregister(drvdata);
+}
+
+static int dcc_probe(struct platform_device *pdev)
+{
+ int ret = 0, i;
+ struct device *dev = &pdev->dev;
+ struct dcc_drvdata *drvdata;
+ struct resource *res;
+ const struct qcom_dcc_config *cfg;
+
+ drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+
+ drvdata->dev = &pdev->dev;
+ platform_set_drvdata(pdev, drvdata);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dcc-base");
+ if (!res)
+ return -EINVAL;
+
+ drvdata->reg_size = resource_size(res);
+ drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
+ if (!drvdata->base)
+ return -ENOMEM;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "dcc-ram-base");
+ if (!res)
+ return -EINVAL;
+
+ drvdata->ram_size = resource_size(res);
+ drvdata->ram_base = devm_ioremap(dev, res->start, resource_size(res));
+ if (!drvdata->ram_base)
+ return -ENOMEM;
+ cfg = of_device_get_match_data(&pdev->dev);
+ drvdata->ram_offset = cfg->dcc_ram_offset;
+
+ if (BVAL(dcc_readl(drvdata, DCC_HW_INFO), DCC_VER_INFO_BIT)) {
+ drvdata->mem_map_ver = DCC_MEM_MAP_VER3;
+ drvdata->nr_link_list = dcc_readl(drvdata, DCC_LL_NUM_INFO);
+ if (drvdata->nr_link_list == 0)
+ return -EINVAL;
+ } else if ((dcc_readl(drvdata, DCC_HW_INFO) & DCC_VER_MASK2) ==
DCC_VER_MASK2) {
+ drvdata->mem_map_ver = DCC_MEM_MAP_VER2;
+ drvdata->nr_link_list = dcc_readl(drvdata, DCC_LL_NUM_INFO);
+ if (drvdata->nr_link_list == 0)
+ return -EINVAL;
+ } else {
+ drvdata->mem_map_ver = DCC_MEM_MAP_VER1;
+ drvdata->nr_link_list = DCC_MAX_LINK_LIST;
+ }
+
+ if ((dcc_readl(drvdata, DCC_HW_INFO) & BIT(6)) == BIT(6))
+ drvdata->loopoff = DCC_FIX_LOOP_OFFSET;
+ else
+ drvdata->loopoff = get_bitmask_order((drvdata->ram_size +
+ drvdata->ram_offset) / 4 - 1);
+ mutex_init(&drvdata->mutex);
+
+ drvdata->enable = devm_kzalloc(dev, drvdata->nr_link_list *
+ sizeof(bool), GFP_KERNEL);
+ if (!drvdata->enable)
+ return -ENOMEM;
+ drvdata->configured = devm_kzalloc(dev, drvdata->nr_link_list *
+ sizeof(bool), GFP_KERNEL);
+ if (!drvdata->configured)
+ return -ENOMEM;
+ drvdata->nr_config = devm_kzalloc(dev, drvdata->nr_link_list *
+ sizeof(u32), GFP_KERNEL);
+ if (!drvdata->nr_config)
+ return -ENOMEM;
+ drvdata->cfg_head = devm_kzalloc(dev, drvdata->nr_link_list *
+ sizeof(struct list_head), GFP_KERNEL);
+ if (!drvdata->cfg_head)
+ return -ENOMEM;
+
+ for (i = 0; i < drvdata->nr_link_list; i++) {
+ INIT_LIST_HEAD(&drvdata->cfg_head[i]);
+ drvdata->nr_config[i] = 0;
+ }
+
+ memset_io(drvdata->ram_base, 0, drvdata->ram_size);
+
+ drvdata->curr_list = DCC_INVALID_LINK_LIST;
+
+ ret = dcc_sram_dev_init(drvdata);
+ if (ret)
+ goto err;
+
+ return ret;
+err:
+ return ret;
+}
+
+static int dcc_remove(struct platform_device *pdev)
+{
+ struct dcc_drvdata *drvdata = platform_get_drvdata(pdev);
+
+ dcc_sram_dev_exit(drvdata);
+
+ dcc_config_reset(drvdata);
+
+ return 0;
+}
+
+static const struct of_device_id dcc_match_table[] = {
+ { .compatible = "qcom,sm8150-dcc", .data = &sm8150_cfg },
+};
+
+static struct platform_driver dcc_driver = {
+ .probe = dcc_probe,
+ .remove = dcc_remove,
+ .driver = {
+ .name = "msm-dcc",
+ .of_match_table = dcc_match_table,
+ },
+};
+
+module_platform_driver(dcc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Qualcomm Technologies Inc. DCC driver");
+
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
