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Subject: Re: [PATCH v2 2/2] drivers: soc: Add LLCC driver
To:     Rishabh Bhatnagar <rishabhb@codeaurora.org>,
        linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org
Cc:     linux-arm@lists.infradead.org, linux-kernel@vger.kernel.org,
        tsoni@codeaurora.org, kyan@codeaurora.org, ckadabi@codeaurora.org
References: <1521941356-12361-1-git-send-email-rishabhb@codeaurora.org>
 <1521941356-12361-3-git-send-email-rishabhb@codeaurora.org>
From:   Nabarun Basu <nbasu@codeaurora.org>
Message-ID: <cf70f65c-3410-a274-df98-8d69f3f836fc@codeaurora.org>
Date:   Mon, 26 Mar 2018 17:50:09 +0530
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1) llcc-core.c file is missing, leading to failure in kernel compilation.
2) The Patch is also having some trailing whitespace errors.


On 3/25/2018 6:59 AM, Rishabh Bhatnagar wrote:
> LLCC (Last Level Cache Controller) provides additional cache memory
> in the system. LLCC is partitioned into muliple slices and each
> slice getting its own priority, size, ID and other config parameters.
> LLCC driver programs these parameters for each slice. Clients that
> are assigned to use LLCC need to get information such size & ID of the
>   slice they get and activate or deactivate the slice as needed. LLCC driver
> provides API interfaces for the clients to perform these operations.
>
> Change-Id: I93c5f3225d0a917f0d6c64c7588a4e64e33a59ed
> Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>
> Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
> ---
>   drivers/soc/qcom/Kconfig           |  16 ++
>   drivers/soc/qcom/Makefile          |   2 +
>   drivers/soc/qcom/llcc-sdm845.c     | 120 ++++++++++
>   drivers/soc/qcom/llcc-slice.c      | 454 +++++++++++++++++++++++++++++++++++++
>   include/linux/soc/qcom/llcc-qcom.h | 178 +++++++++++++++
>   5 files changed, 770 insertions(+)
>   create mode 100644 drivers/soc/qcom/llcc-sdm845.c
>   create mode 100644 drivers/soc/qcom/llcc-slice.c
>   create mode 100644 include/linux/soc/qcom/llcc-qcom.h
>
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index e050eb8..28237fc 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -21,6 +21,22 @@ config QCOM_GSBI
>             functions for connecting the underlying serial UART, SPI, and I2C
>             devices to the output pins.
>   
> +config QCOM_LLCC
> +	tristate "Qualcomm Technologies, Inc. LLCC driver"
> +	depends on ARCH_QCOM
> +	help
> +	  Qualcomm Technologies, Inc. platform specific LLCC driver for Last
> +	  Level Cache. This provides interfaces to client's that use the LLCC.
> +	  Say yes here to enable LLCC slice driver.
> +
> +config QCOM_SDM845_LLCC
> +	tristate "Qualcomm Technologies, Inc. SDM845 LLCC driver"
> +	depends on QCOM_LLCC
> +	help
> +	  Say yes here to enable the LLCC driver for SDM845. This is provides
> +	  data required to configure LLCC so that clients can start using the
> +	  LLCC slices.
> +
>   config QCOM_MDT_LOADER
>   	tristate
>   	select QCOM_SCM
> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
> index dcebf28..234560f 100644
> --- a/drivers/soc/qcom/Makefile
> +++ b/drivers/soc/qcom/Makefile
> @@ -12,3 +12,5 @@ obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
>   obj-$(CONFIG_QCOM_SMP2P)	+= smp2p.o
>   obj-$(CONFIG_QCOM_SMSM)	+= smsm.o
>   obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o
> +obj-$(CONFIG_QCOM_LLCC) += llcc-core.o llcc-slice.o
> +obj-$(CONFIG_QCOM_SDM845_LLCC) += llcc-sdm845.o
> diff --git a/drivers/soc/qcom/llcc-sdm845.c b/drivers/soc/qcom/llcc-sdm845.c
> new file mode 100644
> index 0000000..cd431d9
> --- /dev/null
> +++ b/drivers/soc/qcom/llcc-sdm845.c
> @@ -0,0 +1,120 @@
> +/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
> + *
> + * 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.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/soc/qcom/llcc-qcom.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
> +
> +
> +/*
> + * SCT entry contains of the following parameters
> + * name: Name of the client's use case for which the llcc slice is used
> + * uid: Unique id for the client's use case
> + * slice_id: llcc slice id for each client
> + * max_cap: The maximum capacity of the cache slice provided in KB
> + * priority: Priority of the client used to select victim line for replacement
> + * fixed_size: Determine of the slice has a fixed capacity
> + * bonus_ways: Bonus ways to be used by any slice, bonus way is used only if
> + *             it't not a reserved way.
> + * res_ways: Reserved ways for the cache slice, the reserved ways cannot be
> + *          used by any other client than the one its assigned to.
> + * cache_mode: Each slice operates as a cache, this controls the mode of the
> + *             slice normal or TCM
> + * probe_target_ways: Determines what ways to probe for access hit. When
> + *                    configured to 1 only bonus and reseved ways are probed.
> + *                    when configured to 0 all ways in llcc are probed.
> + * dis_cap_alloc: Disable capacity based allocation for a client
> + * retain_on_pc: If this bit is set and client has maitained active vote
> + *               then the ways assigned to this client are not flushed on power
> + *               collapse.
> + * activate_on_init: Activate the slice immidiately after the SCT is programmed
> + */
> +#define SCT_ENTRY(n, uid, sid, mc, p, fs, bway, rway, cmod, ptw, dca, rp, a) \
> +	{					\
> +		.name = n,			\
> +		.usecase_id = uid,		\
> +		.slice_id = sid,		\
> +		.max_cap = mc,			\
> +		.priority = p,			\
> +		.fixed_size = fs,		\
> +		.bonus_ways = bway,		\
> +		.res_ways = rway,		\
> +		.cache_mode = cmod,		\
> +		.probe_target_ways = ptw,	\
> +		.dis_cap_alloc = dca,		\
> +		.retain_on_pc = rp,		\
> +		.activate_on_init = a,		\
> +	}
> +
> +
> +static struct llcc_slice_config sdm845_data[] =  {
> +	SCT_ENTRY("cpuss",       1, 1, 2816, 1, 0, 0xFFC, 0x2, 0, 0, 1, 1, 1),
> +	SCT_ENTRY("vidsc0",      2, 2, 512, 2, 1, 0x0,  0x0F0, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("vidsc1",      3, 3, 512, 2, 1, 0x0,  0x0F0, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("rotator",     4, 4, 563, 2, 1, 0x0,  0x00e, 2, 0, 1, 1, 0),
> +	SCT_ENTRY("voice",       5, 5, 2816, 1, 0, 0xFFC, 0x2, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("audio",       6, 6, 2816, 1, 0, 0xFFC, 0x2, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("modemhp_grow", 7, 7, 1024, 2, 0, 0x0FC, 0xF00, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("modem",       8, 8, 2816, 1, 0, 0xFFC, 0x2, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("compute",     10, 10, 2816, 1, 0, 0xFFC, 0x2, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("gpuhtw",      11, 11, 512, 1, 1, 0xC,  0x0, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("gpu",         12, 12, 2304, 1, 0, 0xFF0, 0x2, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("mmuhwt",      13, 13, 256, 2, 0, 0x0,  0x1, 0, 0, 1, 0, 1),
> +	SCT_ENTRY("compute_dma", 15, 15, 2816, 1, 0, 0xFFC, 0x2, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("display",     16, 16, 2816, 1, 0, 0xFFC, 0x2, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("videofw",     17, 17, 2816, 1, 0, 0xFFC, 0x2, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("modemhp_fix", 20, 20, 1024, 2, 1, 0x0,  0xF00, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("modem_paging", 21, 21, 1024, 0, 1, 0x1e, 0x0, 0, 0, 1, 1, 0),
> +	SCT_ENTRY("audiohw",     22, 22, 1024, 1, 1, 0xFFC, 0x2, 0, 0, 1, 1, 0),
> +};
> +
> +
> +static int sdm845_qcom_llcc_probe(struct platform_device *pdev)
> +{
> +	return qcom_llcc_probe(pdev, sdm845_data,ARRAY_SIZE(sdm845_data));
> +}
> +
> +static const struct of_device_id sdm845_qcom_llcc_of_match[] = {
> +	{ .compatible = "qcom,sdm845-llcc", },
> +	{ },
> +};
> +
> +static struct platform_driver sdm845_qcom_llcc_driver = {
> +	.driver = {
> +		.name = "sdm845-llcc",
> +		.owner = THIS_MODULE,
> +		.of_match_table = sdm845_qcom_llcc_of_match,
> +	},
> +	.probe = sdm845_qcom_llcc_probe,
> +	.remove = qcom_llcc_remove,
> +};
> +
> +static int __init sdm845_init_qcom_llcc_init(void)
> +{
> +	return platform_driver_register(&sdm845_qcom_llcc_driver);
> +}
> +module_init(sdm845_init_qcom_llcc_init);
> +
> +static void __exit sdm845_exit_qcom_llcc_exit(void)
> +{
> +	platform_driver_unregister(&sdm845_qcom_llcc_driver);
> +}
> +module_exit(sdm845_exit_qcom_llcc_exit);
> +
> +MODULE_DESCRIPTION("QTI sdm845 LLCC driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/soc/qcom/llcc-slice.c b/drivers/soc/qcom/llcc-slice.c
> new file mode 100644
> index 0000000..6e86770
> --- /dev/null
> +++ b/drivers/soc/qcom/llcc-slice.c
> @@ -0,0 +1,454 @@
> +/* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
> + *
> + * 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/kernel.h>
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/mutex.h>
> +#include <linux/bitmap.h>
> +#include <linux/bitops.h>
> +#include <linux/slab.h>
> +#include <linux/io.h>
> +#include <linux/err.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
> +#include <linux/soc/qcom/llcc-qcom.h>
> +
> +#define ACTIVATE                      0x1
> +#define DEACTIVATE                    0x2
> +#define ACT_CTRL_OPCODE_ACTIVATE      0x1
> +#define ACT_CTRL_OPCODE_DEACTIVATE    0x2
> +#define ACT_CTRL_ACT_TRIG             0x1
> +#define ACT_CTRL_OPCODE_SHIFT         0x1
> +#define ATTR1_PROBE_TARGET_WAYS_SHIFT 0x2
> +#define ATTR1_FIXED_SIZE_SHIFT        0x3
> +#define ATTR1_PRIORITY_SHIFT          0x4
> +#define ATTR1_MAX_CAP_SHIFT           0x10
> +#define ATTR0_RES_WAYS_MASK           0x00000fff
> +#define ATR0_BONUS_WAYS_MASK          0x0fff0000
> +#define ATR0_BONUS_WAYS_SHIFT         0x10
> +#define LLCC_STATUS_READ_DELAY 100
> +
> +#define CACHE_LINE_SIZE_SHIFT 6
> +
> +#define LLCC_COMMON_STATUS0		0x0003000C
> +#define LLCC_LB_CNT_MASK		0xf0000000
> +#define LLCC_LB_CNT_SHIFT		28
> +
> +#define MAX_CAP_TO_BYTES(n) (n * 1024)
> +#define LLCC_TRP_ACT_CTRLn(n) (n * 0x1000)
> +#define LLCC_TRP_STATUSn(n)   (4 + n * 0x1000)
> +#define LLCC_TRP_ATTR0_CFGn(n) (0x21000 + 0x8 * n)
> +#define LLCC_TRP_ATTR1_CFGn(n) (0x21004 + 0x8 * n)
> +
> +
> +
> +static const struct regmap_config llcc_regmap_config = {
> +        .reg_bits = 32,
> +        .reg_stride = 4,
> +        .val_bits = 32,
> +        .fast_io = true,
> +};
> +
> +
> +/* Get the slice entry by index */
> +static struct llcc_slice_desc *llcc_slice_get_entry(struct device *dev, int n)
> +{
> +	struct of_phandle_args phargs;
> +	struct llcc_drv_data *drv;
> +	const struct llcc_slice_config *llcc_data_ptr;
> +	struct llcc_slice_desc *desc;
> +	struct platform_device *pdev;
> +	u32 sz, count;
> +
> +	if (of_parse_phandle_with_args(dev->of_node, "cache-slices",
> +				       "#cache-cells", n, &phargs)) {
> +		pr_err("can't parse \"cache-slices\" property\n");
> +		return ERR_PTR(-ENODEV);
> +	}
> +
> +	pdev = of_find_device_by_node(phargs.np);
> +	if (!pdev) {
> +		pr_err("Cannot find platform device from phandle\n");
> +		return ERR_PTR(-ENODEV);
> +	}
> +
> +	drv = platform_get_drvdata(pdev);
> +	if (!drv) {
> +		pr_err("cannot find platform driver data\n");
> +		return ERR_PTR(-EFAULT);
> +	}
> +
> +	llcc_data_ptr = drv->slice_data;
> +	sz = drv->llcc_config_data_sz;
> +	count = 0;
> +
> +	while (llcc_data_ptr && count < sz) {
> +		if (llcc_data_ptr->usecase_id == phargs.args[0])
> +			break;
> +		llcc_data_ptr++;
> +		count++;
> +	}
> +
> +	if (llcc_data_ptr == NULL || count == sz) {
> +		pr_err("can't find %d usecase id\n", phargs.args[0]);
> +		return ERR_PTR(-ENODEV);
> +	}
> +
> +	desc = kzalloc(sizeof(struct llcc_slice_desc), GFP_KERNEL);
> +	if (!desc)
> +		return ERR_PTR(-ENOMEM);
> +
> +	desc->llcc_slice_id = llcc_data_ptr->slice_id;
> +	desc->llcc_slice_size = llcc_data_ptr->max_cap;
> +	desc->dev = &pdev->dev;
> +
> +	return desc;
> +}
> +
> +/**
> + * llcc_slice_getd - get llcc slice descriptor
> + * @dev: Device pointer of the client
> + * @name: Name of the use case
> + *
> + * A pointer to llcc slice descriptor will be returned on success and
> + * and error pointer is returned on failure
> + */
> +struct llcc_slice_desc *llcc_slice_getd(struct device *dev, const char *name)
> +{
> +	struct device_node *np = dev->of_node;
> +	int index = 0;
> +	const char *slice_name;
> +	struct property *prop;
> +
> +	if (!np) {
> +		dev_err(dev, "%s() currently only supports DT\n", __func__);
> +		return ERR_PTR(-ENOENT);
> +	}
> +
> +	if (!of_get_property(np, "cache-slice-names", NULL)) {
> +		dev_err(dev,
> +			"%s() requires a \"cache-slice-names\" property\n",
> +			__func__);
> +		return ERR_PTR(-ENOENT);
> +	}
> +
> +	of_property_for_each_string(np, "cache-slice-names", prop, slice_name) {
> +		if (!strcmp(name, slice_name))
> +			break;
> +		index++;
> +	}
> +
> +	return llcc_slice_get_entry(dev, index);
> +}
> +EXPORT_SYMBOL(llcc_slice_getd);
> +
> +/**
> + * llcc_slice_putd - llcc slice descritpor
> + * @desc: Pointer to llcc slice descriptor
> + */
> +void llcc_slice_putd(struct llcc_slice_desc *desc)
> +{
> +	kfree(desc);
> +}
> +EXPORT_SYMBOL(llcc_slice_putd);
> +
> +static int llcc_update_act_ctrl(struct llcc_drv_data *drv, u32 sid,
> +				u32 act_ctrl_reg_val, u32 status)
> +{
> +	u32 act_ctrl_reg;
> +	u32 status_reg;
> +	u32 slice_status;
> +	unsigned long timeout;
> +
> +	act_ctrl_reg = drv->b_off + LLCC_TRP_ACT_CTRLn(sid);
> +	status_reg = drv->b_off + LLCC_TRP_STATUSn(sid);
> +
> +	regmap_write(drv->llcc_map, act_ctrl_reg, act_ctrl_reg_val);
> +
> +	/* Make sure the activate trigger is applied before clearing it */
> +	mb();
> +
> +	/* Clear the ACTIVE trigger */
> +	act_ctrl_reg_val &= ~ACT_CTRL_ACT_TRIG;
> +	regmap_write(drv->llcc_map, act_ctrl_reg, act_ctrl_reg_val);
> +
> +	timeout = jiffies + usecs_to_jiffies(LLCC_STATUS_READ_DELAY);
> +	while (time_before(jiffies, timeout)) {
> +		regmap_read(drv->llcc_map, status_reg, &slice_status);
> +		if (!(slice_status & status))
> +			return 0;
> +	}
> +
> +	return -ETIMEDOUT;
> +}
> +
> +/**
> + * llcc_slice_activate - Activate the llcc slice
> + * @desc: Pointer to llcc slice descriptor
> + *
> + * A value zero will be returned on success and a negative errno will
> + * be returned in error cases
> + */
> +int llcc_slice_activate(struct llcc_slice_desc *desc)
> +{
> +	int rc = -EINVAL;
> +	u32 act_ctrl_val;
> +	struct llcc_drv_data *drv;
> +
> +	if (desc == NULL)
> +		return rc;
> +
> +	drv = dev_get_drvdata(desc->dev);
> +	if (!drv)
> +		return rc;
> +
> +	mutex_lock(&drv->slice_mutex);
> +	if (test_bit(desc->llcc_slice_id, drv->llcc_slice_map)) {
> +		mutex_unlock(&drv->slice_mutex);
> +		return 0;
> +	}
> +
> +	act_ctrl_val = ACT_CTRL_OPCODE_ACTIVATE << ACT_CTRL_OPCODE_SHIFT;
> +	act_ctrl_val |= ACT_CTRL_ACT_TRIG;
> +
> +	rc = llcc_update_act_ctrl(drv, desc->llcc_slice_id, act_ctrl_val,
> +				  DEACTIVATE);
> +
> +	__set_bit(desc->llcc_slice_id, drv->llcc_slice_map);
> +	mutex_unlock(&drv->slice_mutex);
> +
> +	return rc;
> +}
> +EXPORT_SYMBOL(llcc_slice_activate);
> +
> +/**
> + * llcc_slice_deactivate - Deactivate the llcc slice
> + * @desc: Pointer to llcc slice descriptor
> + *
> + * A value zero will be returned on success and a negative errno will
> + * be returned in error cases
> + */
> +int llcc_slice_deactivate(struct llcc_slice_desc *desc)
> +{
> +	u32 act_ctrl_val;
> +	int rc = -EINVAL;
> +	struct llcc_drv_data *drv;
> +
> +	if (desc == NULL)
> +		return rc;
> +
> +	drv = dev_get_drvdata(desc->dev);
> +	if (!drv)
> +		return rc;
> +
> +	mutex_lock(&drv->slice_mutex);
> +	if (!test_bit(desc->llcc_slice_id, drv->llcc_slice_map)) {
> +		mutex_unlock(&drv->slice_mutex);
> +		return 0;
> +	}
> +	act_ctrl_val = ACT_CTRL_OPCODE_DEACTIVATE << ACT_CTRL_OPCODE_SHIFT;
> +	act_ctrl_val |= ACT_CTRL_ACT_TRIG;
> +
> +	rc = llcc_update_act_ctrl(drv, desc->llcc_slice_id, act_ctrl_val,
> +				  ACTIVATE);
> +
> +	__clear_bit(desc->llcc_slice_id, drv->llcc_slice_map);
> +	mutex_unlock(&drv->slice_mutex);
> +
> +	return rc;
> +}
> +EXPORT_SYMBOL(llcc_slice_deactivate);
> +
> +/**
> + * llcc_get_slice_id - return the slice id
> + * @desc: Pointer to llcc slice descriptor
> + *
> + * A positive value will be returned on success and a negative errno will
> + * be returned on error
> + */
> +int llcc_get_slice_id(struct llcc_slice_desc *desc)
> +{
> +	if (!desc)
> +		return -EINVAL;
> +
> +	return desc->llcc_slice_id;
> +}
> +EXPORT_SYMBOL(llcc_get_slice_id);
> +
> +/**
> + * llcc_get_slice_size - return the slice id
> + * @desc: Pointer to llcc slice descriptor
> + *
> + * A positive value will be returned on success and zero will returned on
> + * error
> + */
> +size_t llcc_get_slice_size(struct llcc_slice_desc *desc)
> +{
> +	if (!desc)
> +		return 0;
> +
> +	return desc->llcc_slice_size;
> +}
> +EXPORT_SYMBOL(llcc_get_slice_size);
> +
> +static void qcom_llcc_cfg_program(struct platform_device *pdev)
> +{
> +	int i;
> +	u32 attr1_cfg;
> +	u32 attr0_cfg;
> +	u32 attr1_val;
> +	u32 attr0_val;
> +	u32 max_cap_cacheline;
> +	u32 sz;
> +	const struct llcc_slice_config *llcc_table;
> +	struct llcc_slice_desc desc;
> +        struct llcc_drv_data *drv = platform_get_drvdata(pdev);
> +	u32 b_off = drv->b_off;
> +
> +	sz = drv->llcc_config_data_sz;
> +	llcc_table = drv->slice_data;
> +
> +	for (i = 0; i < sz; i++) {
> +		attr1_cfg = b_off + LLCC_TRP_ATTR1_CFGn(llcc_table[i].slice_id);
> +		attr0_cfg = b_off + LLCC_TRP_ATTR0_CFGn(llcc_table[i].slice_id);
> +
> +		attr1_val = llcc_table[i].cache_mode;
> +		attr1_val |= (llcc_table[i].probe_target_ways <<
> +				ATTR1_PROBE_TARGET_WAYS_SHIFT);
> +		attr1_val |= (llcc_table[i].fixed_size <<
> +				ATTR1_FIXED_SIZE_SHIFT);
> +		attr1_val |= (llcc_table[i].priority << ATTR1_PRIORITY_SHIFT);
> +
> +		max_cap_cacheline = MAX_CAP_TO_BYTES(llcc_table[i].max_cap);
> +
> +		/* LLCC instances can vary for each target.
> +		 * The SW writes to broadcast register which gets propagated
> +		 * to each llcc instace (llcc0,.. llccN).
> +		 * Since the size of the memory is divided equally amongst the
> +		 * llcc instances, we need to configure the max cap accordingly.
> +		 */
> +		max_cap_cacheline = (max_cap_cacheline / drv->num_banks);
> +		max_cap_cacheline >>= CACHE_LINE_SIZE_SHIFT;
> +		attr1_val |= (max_cap_cacheline << ATTR1_MAX_CAP_SHIFT);
> +
> +		attr0_val = llcc_table[i].res_ways & ATTR0_RES_WAYS_MASK;
> +		attr0_val |= llcc_table[i].bonus_ways << ATR0_BONUS_WAYS_SHIFT;
> +
> +		regmap_write(drv->llcc_map, attr1_cfg, attr1_val);
> +		regmap_write(drv->llcc_map, attr0_cfg, attr0_val);
> +
> +		/* Make sure that the SCT is programmed before activating */
> +		mb();
> +
> +		if (llcc_table[i].activate_on_init) {
> +			desc.llcc_slice_id = llcc_table[i].slice_id;
> +			desc.dev = &pdev->dev;
> +			if (llcc_slice_activate(&desc)) {
> +				pr_err("activate slice id: %d timed out\n",
> +						desc.llcc_slice_id);
> +			}
> +		}
> +	}
> +}
> +
> +int qcom_llcc_probe(struct platform_device *pdev,
> +		      const struct llcc_slice_config *llcc_cfg, u32 sz)
> +{
> +	int rc = 0;
> +	u32 num_banks = 0;
> +	struct device *dev = &pdev->dev;
> +	static struct llcc_drv_data *drv_data;
> +	struct resource *res;
> +	void __iomem *base;
> +	
> +	drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
> +	if (!drv_data)
> +		return PTR_ERR(drv_data);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);	
> +	base = devm_ioremap_resource(&pdev->dev, res);
> +    if (IS_ERR(base)) {
> +    	dev_err(&pdev->dev,"Cannot find the resource in device\n");
> +    	return PTR_ERR(base);
> +    }
> +
> +    drv_data->llcc_map = devm_regmap_init_mmio(dev, base, &llcc_regmap_config);
> +    if (IS_ERR(drv_data->llcc_map)) {
> +        dev_err(&pdev->dev,"Cannot init the regmap for llcc\n");
> +        return PTR_ERR(drv_data->llcc_map);
> +    }
> +
> +	regmap_read(drv_data->llcc_map, LLCC_COMMON_STATUS0,
> +		    &num_banks);
> +
> +	num_banks &= LLCC_LB_CNT_MASK;
> +	num_banks >>= LLCC_LB_CNT_SHIFT;
> +	drv_data->num_banks = num_banks;
> +
> +	rc = of_property_read_u32(pdev->dev.of_node, "max-slices",
> +				  &drv_data->max_slices);
> +	if (rc) {
> +		dev_err(&pdev->dev, "Invalid max-slices dt entry\n");
> +		devm_kfree(&pdev->dev, drv_data);
> +		return rc;
> +	}
> +	drv_data->offsets = devm_kzalloc(dev, num_banks*sizeof(u32), GFP_KERNEL);
> +	if (!drv_data->offsets) {
> +		devm_kfree(&pdev->dev, drv_data);
> +        return PTR_ERR(drv_data->offsets);
> +	}
> +	
> +	drv_data->offsets[0] = 0x0;
> +	drv_data->offsets[1] = 0x80000;
> +	drv_data->offsets[2] = 0x100000;
> +	drv_data->offsets[3] = 0x180000;
> +	drv_data->b_off = 0x200000;
> +
> +	drv_data->llcc_slice_map = kcalloc(BITS_TO_LONGS(drv_data->max_slices),
> +				   sizeof(unsigned long), GFP_KERNEL);
> +
> +	if (!drv_data->llcc_slice_map) {
> +		devm_kfree(&pdev->dev, drv_data);
> +		return PTR_ERR(drv_data->llcc_slice_map);
> +	}
> +
> +	bitmap_zero(drv_data->llcc_slice_map, drv_data->max_slices);
> +	drv_data->slice_data = llcc_cfg;
> +	drv_data->llcc_config_data_sz = sz;
> +	mutex_init(&drv_data->slice_mutex);
> +	platform_set_drvdata(pdev, drv_data);
> +
> +	qcom_llcc_cfg_program(pdev);
> +
> +	return rc;
> +}
> +EXPORT_SYMBOL(qcom_llcc_probe);
> +
> +int qcom_llcc_remove(struct platform_device *pdev)
> +{
> +	static struct llcc_drv_data *drv_data;
> +
> +	drv_data = platform_get_drvdata(pdev);
> +
> +	mutex_destroy(&drv_data->slice_mutex);
> +	kfree(drv_data->llcc_slice_map);
> +	devm_kfree(&pdev->dev, drv_data);
> +	platform_set_drvdata(pdev, NULL);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(qcom_llcc_remove);
> diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
> new file mode 100644
> index 0000000..c408a8d
> --- /dev/null
> +++ b/include/linux/soc/qcom/llcc-qcom.h
> @@ -0,0 +1,178 @@
> +/* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
> + *
> + * 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.
> + */
> +
> +#ifndef __LLCC_QCOM__
> +#define __LLCC_QCOM__
> +
> +/**
> + * llcc_slice_desc - Cache slice descriptor
> + * @llcc_slice_id: llcc slice id
> + * @llcc_slice_size: Size allocated for the llcc slice
> + * @dev: pointer to llcc device
> + */
> +struct llcc_slice_desc {
> +	int llcc_slice_id;
> +	size_t llcc_slice_size;
> +	struct device *dev;
> +};
> +
> +/**
> + * llcc_slice_config - Data associated with the llcc slice
> + * @name: name of the use case associated with the llcc slice
> + * @usecase_id: usecase id for which the llcc slice is used
> + * @slice_id: llcc slice id assigned to each slice
> + * @max_cap: maximum capacity of the llcc slice
> + * @priority: priority of the llcc slice
> + * @fixed_size: whether the llcc slice can grow beyond its size
> + * @bonus_ways: bonus ways associated with llcc slice
> + * @res_ways: reserved ways associated with llcc slice
> + * @cache_mode: mode of the llcce slice
> + * @probe_target_ways: Probe only reserved and bonus ways on a cache miss
> + * @dis_cap_alloc: Disable capacity based allocation
> + * @retain_on_pc: Retain through power collapse
> + * @activate_on_init: activate the slice on init
> + */
> +struct llcc_slice_config {
> +	const char *name;
> +	int usecase_id;
> +	int slice_id;
> +	u32 max_cap;
> +	u32 priority;
> +	bool fixed_size;
> +	u32 bonus_ways;
> +	u32 res_ways;
> +	u32 cache_mode;
> +	u32 probe_target_ways;
> +	bool dis_cap_alloc;
> +	bool retain_on_pc;
> +	u32 activate_on_init;
> +};
> +
> +/**
> + * llcc_drv_data - Data associated with the llcc driver
> + * @llcc_map: regmap associated with the llcc device
> + * @slice_data: pointer to the data structure associated with slice
> + * @slice_mutex: mutex associated with each slice
> + * @llcc_config_data_sz: size of the config data table
> + * @max_slices: max slices as read from device tree
> + * @b_off: Offset of the broadcast bank
> + * @num_banks: Number of llcc banks
> + * @llcc_slice_map: Bit map to track the active slice ids
> + * @offsets: Pointer to the bank offsets array
> + */
> +
> +struct llcc_drv_data {
> +        struct regmap *llcc_map;
> +        const struct llcc_slice_config *slice_data;
> +        struct mutex slice_mutex;
> +        u32 llcc_config_data_sz;
> +        u32 max_slices;
> +        u32 b_off;
> +        u32 num_banks;
> +        unsigned long *llcc_slice_map;
> +        u32 *offsets;
> +};
> +
> +
> +#ifdef CONFIG_QCOM_LLCC
> +/**
> + * llcc_slice_getd - get llcc slice descriptor
> + * @dev: Device pointer of the client
> + * @name: Name of the use case
> + */
> +struct llcc_slice_desc *llcc_slice_getd(struct device *dev, const char *name);
> +
> +/**
> + * llcc_slice_putd - llcc slice descritpor
> + * @desc: Pointer to llcc slice descriptor
> + */
> +void llcc_slice_putd(struct llcc_slice_desc *desc);
> +
> +/**
> + * llcc_get_slice_id - get slice id
> + * @desc: Pointer to llcc slice descriptor
> + */
> +int llcc_get_slice_id(struct llcc_slice_desc *desc);
> +
> +/**
> + * llcc_get_slice_size - llcc slice size
> + * @desc: Pointer to llcc slice descriptor
> + */
> +size_t llcc_get_slice_size(struct llcc_slice_desc *desc);
> +
> +/**
> + * llcc_slice_activate - Activate the llcc slice
> + * @desc: Pointer to llcc slice descriptor
> + */
> +int llcc_slice_activate(struct llcc_slice_desc *desc);
> +
> +/**
> + * llcc_slice_deactivate - Deactivate the llcc slice
> + * @desc: Pointer to llcc slice descriptor
> + */
> +int llcc_slice_deactivate(struct llcc_slice_desc *desc);
> +
> +/**
> + * qcom_llcc_probe - program the sct table
> + * @pdev: platform device pointer
> + * @table: soc sct table
> + */
> +int qcom_llcc_probe(struct platform_device *pdev,
> +		      const struct llcc_slice_config *table, u32 sz);
> +/**
> + * qcom_llcc_remove - clean up llcc driver
> + * @pdev: platform driver pointer
> + */
> +int qcom_llcc_remove(struct platform_device *pdev);
> +#else
> +static inline struct llcc_slice_desc *llcc_slice_getd(struct device *dev,
> +			const char *name)
> +{
> +	return NULL;
> +}
> +
> +static inline void llcc_slice_putd(struct llcc_slice_desc *desc)
> +{
> +
> +};
> +
> +static inline int llcc_get_slice_id(struct llcc_slice_desc *desc)
> +{
> +	return -EINVAL;
> +}
> +
> +static inline size_t llcc_get_slice_size(struct llcc_slice_desc *desc)
> +{
> +	return 0;
> +}
> +static inline int llcc_slice_activate(struct llcc_slice_desc *desc)
> +{
> +	return -EINVAL;
> +}
> +
> +static inline int llcc_slice_deactivate(struct llcc_slice_desc *desc)
> +{
> +	return -EINVAL;
> +}
> +static inline int qcom_llcc_probe(struct platform_device *pdev,
> +		      const struct llcc_slice_config *table, u32 sz)
> +{
> +	return -ENODEV;
> +}
> +
> +static inline int qcom_llcc_remove(struct platform_device *pdev)
> +{
> +	return -ENODEV;
> +}
> +#endif
> +
> +#endif

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