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soc: qcom: Add GENI based QUP Wrapper driver

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This driver manages the Generic Interface (GENI) firmware based Qualcomm
Universal Peripheral (QUP) Wrapper. GENI based QUP is the next generation
programmable module composed of multiple Serial Engines (SE) and supports
a wide range of serial interfaces like UART, SPI, I2C, I3C, etc. This
driver also enables managing the serial interface independent aspects of
Serial Engines.

Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>
Reviewed-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
This commit is contained in:
Karthikeyan Ramasubramanian 2018-03-30 11:08:17 -06:00 committed by Andy Gross
parent 64bf6b260e
commit eddac5af06
4 changed files with 1183 additions and 0 deletions
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9
drivers/soc/qcom/Kconfig
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@ -3,6 +3,15 @@
#
menu "Qualcomm SoC drivers"
config QCOM_GENI_SE
tristate "QCOM GENI Serial Engine Driver"
depends on ARCH_QCOM || COMPILE_TEST
help
This driver is used to manage Generic Interface (GENI) firmware based
Qualcomm Technologies, Inc. Universal Peripheral (QUP) Wrapper. This
driver is also used to manage the common aspects of multiple Serial
Engines present in the QUP.
config QCOM_GLINK_SSR
tristate "Qualcomm Glink SSR driver"
depends on RPMSG

1
drivers/soc/qcom/Makefile
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@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_QCOM_GENI_SE) += qcom-geni-se.o
obj-$(CONFIG_QCOM_GLINK_SSR) += glink_ssr.o
obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
obj-$(CONFIG_QCOM_MDT_LOADER) += mdt_loader.o

748
drivers/soc/qcom/qcom-geni-se.c Normal file
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@ -0,0 +1,748 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/qcom-geni-se.h>
/**
* DOC: Overview
*
* Generic Interface (GENI) Serial Engine (SE) Wrapper driver is introduced
* to manage GENI firmware based Qualcomm Universal Peripheral (QUP) Wrapper
* controller. QUP Wrapper is designed to support various serial bus protocols
* like UART, SPI, I2C, I3C, etc.
*/
/**
* DOC: Hardware description
*
* GENI based QUP is a highly-flexible and programmable module for supporting
* a wide range of serial interfaces like UART, SPI, I2C, I3C, etc. A single
* QUP module can provide upto 8 serial interfaces, using its internal
* serial engines. The actual configuration is determined by the target
* platform configuration. The protocol supported by each interface is
* determined by the firmware loaded to the serial engine. Each SE consists
* of a DMA Engine and GENI sub modules which enable serial engines to
* support FIFO and DMA modes of operation.
*
*
* +-----------------------------------------+
* |QUP Wrapper |
* | +----------------------------+ |
* --QUP & SE Clocks--> | Serial Engine N | +-IO------>
* | | ... | | Interface
* <---Clock Perf.----+ +----+-----------------------+ | |
* State Interface | | Serial Engine 1 | | |
* | | | | |
* | | | | |
* <--------AHB-------> | | | |
* | | +----+ |
* | | | |
* | | | |
* <------SE IRQ------+ +----------------------------+ |
* | |
* +-----------------------------------------+
*
* Figure 1: GENI based QUP Wrapper
*
* The GENI submodules include primary and secondary sequencers which are
* used to drive TX & RX operations. On serial interfaces that operate using
* master-slave model, primary sequencer drives both TX & RX operations. On
* serial interfaces that operate using peer-to-peer model, primary sequencer
* drives TX operation and secondary sequencer drives RX operation.
*/
/**
* DOC: Software description
*
* GENI SE Wrapper driver is structured into 2 parts:
*
* geni_wrapper represents QUP Wrapper controller. This part of the driver
* manages QUP Wrapper information such as hardware version, clock
* performance table that is common to all the internal serial engines.
*
* geni_se represents serial engine. This part of the driver manages serial
* engine information such as clocks, containing QUP Wrapper, etc. This part
* of driver also supports operations (eg. initialize the concerned serial
* engine, select between FIFO and DMA mode of operation etc.) that are
* common to all the serial engines and are independent of serial interfaces.
*/
#define MAX_CLK_PERF_LEVEL 32
#define NUM_AHB_CLKS 2
/**
* @struct geni_wrapper - Data structure to represent the QUP Wrapper Core
* @dev: Device pointer of the QUP wrapper core
* @base: Base address of this instance of QUP wrapper core
* @ahb_clks: Handle to the primary & secondary AHB clocks
*/
struct geni_wrapper {
struct device *dev;
void __iomem *base;
struct clk_bulk_data ahb_clks[NUM_AHB_CLKS];
};
#define QUP_HW_VER_REG 0x4
/* Common SE registers */
#define GENI_INIT_CFG_REVISION 0x0
#define GENI_S_INIT_CFG_REVISION 0x4
#define GENI_OUTPUT_CTRL 0x24
#define GENI_CGC_CTRL 0x28
#define GENI_CLK_CTRL_RO 0x60
#define GENI_IF_DISABLE_RO 0x64
#define GENI_FW_S_REVISION_RO 0x6c
#define SE_GENI_BYTE_GRAN 0x254
#define SE_GENI_TX_PACKING_CFG0 0x260
#define SE_GENI_TX_PACKING_CFG1 0x264
#define SE_GENI_RX_PACKING_CFG0 0x284
#define SE_GENI_RX_PACKING_CFG1 0x288
#define SE_GENI_M_GP_LENGTH 0x910
#define SE_GENI_S_GP_LENGTH 0x914
#define SE_DMA_TX_PTR_L 0xc30
#define SE_DMA_TX_PTR_H 0xc34
#define SE_DMA_TX_ATTR 0xc38
#define SE_DMA_TX_LEN 0xc3c
#define SE_DMA_TX_IRQ_EN 0xc48
#define SE_DMA_TX_IRQ_EN_SET 0xc4c
#define SE_DMA_TX_IRQ_EN_CLR 0xc50
#define SE_DMA_TX_LEN_IN 0xc54
#define SE_DMA_TX_MAX_BURST 0xc5c
#define SE_DMA_RX_PTR_L 0xd30
#define SE_DMA_RX_PTR_H 0xd34
#define SE_DMA_RX_ATTR 0xd38
#define SE_DMA_RX_LEN 0xd3c
#define SE_DMA_RX_IRQ_EN 0xd48
#define SE_DMA_RX_IRQ_EN_SET 0xd4c
#define SE_DMA_RX_IRQ_EN_CLR 0xd50
#define SE_DMA_RX_LEN_IN 0xd54
#define SE_DMA_RX_MAX_BURST 0xd5c
#define SE_DMA_RX_FLUSH 0xd60
#define SE_GSI_EVENT_EN 0xe18
#define SE_IRQ_EN 0xe1c
#define SE_DMA_GENERAL_CFG 0xe30
/* GENI_OUTPUT_CTRL fields */
#define DEFAULT_IO_OUTPUT_CTRL_MSK GENMASK(6, 0)
/* GENI_CGC_CTRL fields */
#define CFG_AHB_CLK_CGC_ON BIT(0)
#define CFG_AHB_WR_ACLK_CGC_ON BIT(1)
#define DATA_AHB_CLK_CGC_ON BIT(2)
#define SCLK_CGC_ON BIT(3)
#define TX_CLK_CGC_ON BIT(4)
#define RX_CLK_CGC_ON BIT(5)
#define EXT_CLK_CGC_ON BIT(6)
#define PROG_RAM_HCLK_OFF BIT(8)
#define PROG_RAM_SCLK_OFF BIT(9)
#define DEFAULT_CGC_EN GENMASK(6, 0)
/* SE_GSI_EVENT_EN fields */
#define DMA_RX_EVENT_EN BIT(0)
#define DMA_TX_EVENT_EN BIT(1)
#define GENI_M_EVENT_EN BIT(2)
#define GENI_S_EVENT_EN BIT(3)
/* SE_IRQ_EN fields */
#define DMA_RX_IRQ_EN BIT(0)
#define DMA_TX_IRQ_EN BIT(1)
#define GENI_M_IRQ_EN BIT(2)
#define GENI_S_IRQ_EN BIT(3)
/* SE_DMA_GENERAL_CFG */
#define DMA_RX_CLK_CGC_ON BIT(0)
#define DMA_TX_CLK_CGC_ON BIT(1)
#define DMA_AHB_SLV_CFG_ON BIT(2)
#define AHB_SEC_SLV_CLK_CGC_ON BIT(3)
#define DUMMY_RX_NON_BUFFERABLE BIT(4)
#define RX_DMA_ZERO_PADDING_EN BIT(5)
#define RX_DMA_IRQ_DELAY_MSK GENMASK(8, 6)
#define RX_DMA_IRQ_DELAY_SHFT 6
/**
* geni_se_get_qup_hw_version() - Read the QUP wrapper Hardware version
* @se: Pointer to the corresponding serial engine.
*
* Return: Hardware Version of the wrapper.
*/
u32 geni_se_get_qup_hw_version(struct geni_se *se)
{
struct geni_wrapper *wrapper = se->wrapper;
return readl_relaxed(wrapper->base + QUP_HW_VER_REG);
}
EXPORT_SYMBOL(geni_se_get_qup_hw_version);
static void geni_se_io_set_mode(void __iomem *base)
{
u32 val;
val = readl_relaxed(base + SE_IRQ_EN);
val |= GENI_M_IRQ_EN | GENI_S_IRQ_EN;
val |= DMA_TX_IRQ_EN | DMA_RX_IRQ_EN;
writel_relaxed(val, base + SE_IRQ_EN);
val = readl_relaxed(base + SE_GENI_DMA_MODE_EN);
val &= ~GENI_DMA_MODE_EN;
writel_relaxed(val, base + SE_GENI_DMA_MODE_EN);
writel_relaxed(0, base + SE_GSI_EVENT_EN);
}
static void geni_se_io_init(void __iomem *base)
{
u32 val;
val = readl_relaxed(base + GENI_CGC_CTRL);
val |= DEFAULT_CGC_EN;
writel_relaxed(val, base + GENI_CGC_CTRL);
val = readl_relaxed(base + SE_DMA_GENERAL_CFG);
val |= AHB_SEC_SLV_CLK_CGC_ON | DMA_AHB_SLV_CFG_ON;
val |= DMA_TX_CLK_CGC_ON | DMA_RX_CLK_CGC_ON;
writel_relaxed(val, base + SE_DMA_GENERAL_CFG);
writel_relaxed(DEFAULT_IO_OUTPUT_CTRL_MSK, base + GENI_OUTPUT_CTRL);
writel_relaxed(FORCE_DEFAULT, base + GENI_FORCE_DEFAULT_REG);
}
/**
* geni_se_init() - Initialize the GENI serial engine
* @se: Pointer to the concerned serial engine.
* @rx_wm: Receive watermark, in units of FIFO words.
* @rx_rfr_wm: Ready-for-receive watermark, in units of FIFO words.
*
* This function is used to initialize the GENI serial engine, configure
* receive watermark and ready-for-receive watermarks.
*/
void geni_se_init(struct geni_se *se, u32 rx_wm, u32 rx_rfr)
{
u32 val;
geni_se_io_init(se->base);
geni_se_io_set_mode(se->base);
writel_relaxed(rx_wm, se->base + SE_GENI_RX_WATERMARK_REG);
writel_relaxed(rx_rfr, se->base + SE_GENI_RX_RFR_WATERMARK_REG);
val = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
val |= M_COMMON_GENI_M_IRQ_EN;
writel_relaxed(val, se->base + SE_GENI_M_IRQ_EN);
val = readl_relaxed(se->base + SE_GENI_S_IRQ_EN);
val |= S_COMMON_GENI_S_IRQ_EN;
writel_relaxed(val, se->base + SE_GENI_S_IRQ_EN);
}
EXPORT_SYMBOL(geni_se_init);
static void geni_se_select_fifo_mode(struct geni_se *se)
{
u32 proto = geni_se_read_proto(se);
u32 val;
writel_relaxed(0, se->base + SE_GSI_EVENT_EN);
writel_relaxed(0xffffffff, se->base + SE_GENI_M_IRQ_CLEAR);
writel_relaxed(0xffffffff, se->base + SE_GENI_S_IRQ_CLEAR);
writel_relaxed(0xffffffff, se->base + SE_DMA_TX_IRQ_CLR);
writel_relaxed(0xffffffff, se->base + SE_DMA_RX_IRQ_CLR);
writel_relaxed(0xffffffff, se->base + SE_IRQ_EN);
val = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
if (proto != GENI_SE_UART) {
val |= M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN;
val |= M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN;
}
writel_relaxed(val, se->base + SE_GENI_M_IRQ_EN);
val = readl_relaxed(se->base + SE_GENI_S_IRQ_EN);
if (proto != GENI_SE_UART)
val |= S_CMD_DONE_EN;
writel_relaxed(val, se->base + SE_GENI_S_IRQ_EN);
val = readl_relaxed(se->base + SE_GENI_DMA_MODE_EN);
val &= ~GENI_DMA_MODE_EN;
writel_relaxed(val, se->base + SE_GENI_DMA_MODE_EN);
}
static void geni_se_select_dma_mode(struct geni_se *se)
{
u32 val;
writel_relaxed(0, se->base + SE_GSI_EVENT_EN);
writel_relaxed(0xffffffff, se->base + SE_GENI_M_IRQ_CLEAR);
writel_relaxed(0xffffffff, se->base + SE_GENI_S_IRQ_CLEAR);
writel_relaxed(0xffffffff, se->base + SE_DMA_TX_IRQ_CLR);
writel_relaxed(0xffffffff, se->base + SE_DMA_RX_IRQ_CLR);
writel_relaxed(0xffffffff, se->base + SE_IRQ_EN);
val = readl_relaxed(se->base + SE_GENI_DMA_MODE_EN);
val |= GENI_DMA_MODE_EN;
writel_relaxed(val, se->base + SE_GENI_DMA_MODE_EN);
}
/**
* geni_se_select_mode() - Select the serial engine transfer mode
* @se: Pointer to the concerned serial engine.
* @mode: Transfer mode to be selected.
*/
void geni_se_select_mode(struct geni_se *se, enum geni_se_xfer_mode mode)
{
WARN_ON(mode != GENI_SE_FIFO && mode != GENI_SE_DMA);
switch (mode) {
case GENI_SE_FIFO:
geni_se_select_fifo_mode(se);
break;
case GENI_SE_DMA:
geni_se_select_dma_mode(se);
break;
case GENI_SE_INVALID:
default:
break;
}
}
EXPORT_SYMBOL(geni_se_select_mode);
/**
* DOC: Overview
*
* GENI FIFO packing is highly configurable. TX/RX packing/unpacking consist
* of up to 4 operations, each operation represented by 4 configuration vectors
* of 10 bits programmed in GENI_TX_PACKING_CFG0 and GENI_TX_PACKING_CFG1 for
* TX FIFO and in GENI_RX_PACKING_CFG0 and GENI_RX_PACKING_CFG1 for RX FIFO.
* Refer to below examples for detailed bit-field description.
*
* Example 1: word_size = 7, packing_mode = 4 x 8, msb_to_lsb = 1
*
* +-----------+-------+-------+-------+-------+
* | | vec_0 | vec_1 | vec_2 | vec_3 |
* +-----------+-------+-------+-------+-------+
* | start | 0x6 | 0xe | 0x16 | 0x1e |
* | direction | 1 | 1 | 1 | 1 |
* | length | 6 | 6 | 6 | 6 |
* | stop | 0 | 0 | 0 | 1 |
* +-----------+-------+-------+-------+-------+
*
* Example 2: word_size = 15, packing_mode = 2 x 16, msb_to_lsb = 0
*
* +-----------+-------+-------+-------+-------+
* | | vec_0 | vec_1 | vec_2 | vec_3 |
* +-----------+-------+-------+-------+-------+
* | start | 0x0 | 0x8 | 0x10 | 0x18 |
* | direction | 0 | 0 | 0 | 0 |
* | length | 7 | 6 | 7 | 6 |
* | stop | 0 | 0 | 0 | 1 |
* +-----------+-------+-------+-------+-------+
*
* Example 3: word_size = 23, packing_mode = 1 x 32, msb_to_lsb = 1
*
* +-----------+-------+-------+-------+-------+
* | | vec_0 | vec_1 | vec_2 | vec_3 |
* +-----------+-------+-------+-------+-------+
* | start | 0x16 | 0xe | 0x6 | 0x0 |
* | direction | 1 | 1 | 1 | 1 |
* | length | 7 | 7 | 6 | 0 |
* | stop | 0 | 0 | 1 | 0 |
* +-----------+-------+-------+-------+-------+
*
*/
#define NUM_PACKING_VECTORS 4
#define PACKING_START_SHIFT 5
#define PACKING_DIR_SHIFT 4
#define PACKING_LEN_SHIFT 1
#define PACKING_STOP_BIT BIT(0)
#define PACKING_VECTOR_SHIFT 10
/**
* geni_se_config_packing() - Packing configuration of the serial engine
* @se: Pointer to the concerned serial engine
* @bpw: Bits of data per transfer word.
* @pack_words: Number of words per fifo element.
* @msb_to_lsb: Transfer from MSB to LSB or vice-versa.
* @tx_cfg: Flag to configure the TX Packing.
* @rx_cfg: Flag to configure the RX Packing.
*
* This function is used to configure the packing rules for the current
* transfer.
*/
void geni_se_config_packing(struct geni_se *se, int bpw, int pack_words,
bool msb_to_lsb, bool tx_cfg, bool rx_cfg)
{
u32 cfg0, cfg1, cfg[NUM_PACKING_VECTORS] = {0};
int len;
int temp_bpw = bpw;
int idx_start = msb_to_lsb ? bpw - 1 : 0;
int idx = idx_start;
int idx_delta = msb_to_lsb ? -BITS_PER_BYTE : BITS_PER_BYTE;
int ceil_bpw = ALIGN(bpw, BITS_PER_BYTE);
int iter = (ceil_bpw * pack_words) / BITS_PER_BYTE;
int i;
if (iter <= 0 || iter > NUM_PACKING_VECTORS)
return;
for (i = 0; i < iter; i++) {
len = min_t(int, temp_bpw, BITS_PER_BYTE) - 1;
cfg[i] = idx << PACKING_START_SHIFT;
cfg[i] |= msb_to_lsb << PACKING_DIR_SHIFT;
cfg[i] |= len << PACKING_LEN_SHIFT;
if (temp_bpw <= BITS_PER_BYTE) {
idx = ((i + 1) * BITS_PER_BYTE) + idx_start;
temp_bpw = bpw;
} else {
idx = idx + idx_delta;
temp_bpw = temp_bpw - BITS_PER_BYTE;
}
}
cfg[iter - 1] |= PACKING_STOP_BIT;
cfg0 = cfg[0] | (cfg[1] << PACKING_VECTOR_SHIFT);
cfg1 = cfg[2] | (cfg[3] << PACKING_VECTOR_SHIFT);
if (tx_cfg) {
writel_relaxed(cfg0, se->base + SE_GENI_TX_PACKING_CFG0);
writel_relaxed(cfg1, se->base + SE_GENI_TX_PACKING_CFG1);
}
if (rx_cfg) {
writel_relaxed(cfg0, se->base + SE_GENI_RX_PACKING_CFG0);
writel_relaxed(cfg1, se->base + SE_GENI_RX_PACKING_CFG1);
}
/*
* Number of protocol words in each FIFO entry
* 0 - 4x8, four words in each entry, max word size of 8 bits
* 1 - 2x16, two words in each entry, max word size of 16 bits
* 2 - 1x32, one word in each entry, max word size of 32 bits
* 3 - undefined
*/
if (pack_words || bpw == 32)
writel_relaxed(bpw / 16, se->base + SE_GENI_BYTE_GRAN);
}
EXPORT_SYMBOL(geni_se_config_packing);
static void geni_se_clks_off(struct geni_se *se)
{
struct geni_wrapper *wrapper = se->wrapper;
clk_disable_unprepare(se->clk);
clk_bulk_disable_unprepare(ARRAY_SIZE(wrapper->ahb_clks),
wrapper->ahb_clks);
}
/**
* geni_se_resources_off() - Turn off resources associated with the serial
* engine
* @se: Pointer to the concerned serial engine.
*
* Return: 0 on success, standard Linux error codes on failure/error.
*/
int geni_se_resources_off(struct geni_se *se)
{
int ret;
ret = pinctrl_pm_select_sleep_state(se->dev);
if (ret)
return ret;
geni_se_clks_off(se);
return 0;
}
EXPORT_SYMBOL(geni_se_resources_off);
static int geni_se_clks_on(struct geni_se *se)
{
int ret;
struct geni_wrapper *wrapper = se->wrapper;
ret = clk_bulk_prepare_enable(ARRAY_SIZE(wrapper->ahb_clks),
wrapper->ahb_clks);
if (ret)
return ret;
ret = clk_prepare_enable(se->clk);
if (ret)
clk_bulk_disable_unprepare(ARRAY_SIZE(wrapper->ahb_clks),
wrapper->ahb_clks);
return ret;
}
/**
* geni_se_resources_on() - Turn on resources associated with the serial
* engine
* @se: Pointer to the concerned serial engine.
*
* Return: 0 on success, standard Linux error codes on failure/error.
*/
int geni_se_resources_on(struct geni_se *se)
{
int ret;
ret = geni_se_clks_on(se);
if (ret)
return ret;
ret = pinctrl_pm_select_default_state(se->dev);
if (ret)
geni_se_clks_off(se);
return ret;
}
EXPORT_SYMBOL(geni_se_resources_on);
/**
* geni_se_clk_tbl_get() - Get the clock table to program DFS
* @se: Pointer to the concerned serial engine.
* @tbl: Table in which the output is returned.
*
* This function is called by the protocol drivers to determine the different
* clock frequencies supported by serial engine core clock. The protocol
* drivers use the output to determine the clock frequency index to be
* programmed into DFS.
*
* Return: number of valid performance levels in the table on success,
* standard Linux error codes on failure.
*/
int geni_se_clk_tbl_get(struct geni_se *se, unsigned long **tbl)
{
unsigned long freq = 0;
int i;
if (se->clk_perf_tbl) {
*tbl = se->clk_perf_tbl;
return se->num_clk_levels;
}
se->clk_perf_tbl = devm_kcalloc(se->dev, MAX_CLK_PERF_LEVEL,
sizeof(*se->clk_perf_tbl),
GFP_KERNEL);
if (!se->clk_perf_tbl)
return -ENOMEM;
for (i = 0; i < MAX_CLK_PERF_LEVEL; i++) {
freq = clk_round_rate(se->clk, freq + 1);
if (!freq || freq == se->clk_perf_tbl[i - 1])
break;
se->clk_perf_tbl[i] = freq;
}
se->num_clk_levels = i;
*tbl = se->clk_perf_tbl;
return se->num_clk_levels;
}
EXPORT_SYMBOL(geni_se_clk_tbl_get);
/**
* geni_se_clk_freq_match() - Get the matching or closest SE clock frequency
* @se: Pointer to the concerned serial engine.
* @req_freq: Requested clock frequency.
* @index: Index of the resultant frequency in the table.
* @res_freq: Resultant frequency which matches or is closer to the
* requested frequency.
* @exact: Flag to indicate exact multiple requirement of the requested
* frequency.
*
* This function is called by the protocol drivers to determine the matching
* or exact multiple of the requested frequency, as provided by the serial
* engine clock in order to meet the performance requirements. If there is
* no matching or exact multiple of the requested frequency found, then it
* selects the closest floor frequency, if exact flag is not set.
*
* Return: 0 on success, standard Linux error codes on failure.
*/
int geni_se_clk_freq_match(struct geni_se *se, unsigned long req_freq,
unsigned int *index, unsigned long *res_freq,
bool exact)
{
unsigned long *tbl;
int num_clk_levels;
int i;
num_clk_levels = geni_se_clk_tbl_get(se, &tbl);
if (num_clk_levels < 0)
return num_clk_levels;
if (num_clk_levels == 0)
return -EINVAL;
*res_freq = 0;
for (i = 0; i < num_clk_levels; i++) {
if (!(tbl[i] % req_freq)) {
*index = i;
*res_freq = tbl[i];
return 0;
}
if (!(*res_freq) || ((tbl[i] > *res_freq) &&
(tbl[i] < req_freq))) {
*index = i;
*res_freq = tbl[i];
}
}
if (exact)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL(geni_se_clk_freq_match);
#define GENI_SE_DMA_DONE_EN BIT(0)
#define GENI_SE_DMA_EOT_EN BIT(1)
#define GENI_SE_DMA_AHB_ERR_EN BIT(2)
#define GENI_SE_DMA_EOT_BUF BIT(0)
/**
* geni_se_tx_dma_prep() - Prepare the serial engine for TX DMA transfer
* @se: Pointer to the concerned serial engine.
* @buf: Pointer to the TX buffer.
* @len: Length of the TX buffer.
* @iova: Pointer to store the mapped DMA address.
*
* This function is used to prepare the buffers for DMA TX.
*
* Return: 0 on success, standard Linux error codes on failure.
*/
int geni_se_tx_dma_prep(struct geni_se *se, void *buf, size_t len,
dma_addr_t *iova)
{
struct geni_wrapper *wrapper = se->wrapper;
u32 val;
*iova = dma_map_single(wrapper->dev, buf, len, DMA_TO_DEVICE);
if (dma_mapping_error(wrapper->dev, *iova))
return -EIO;
val = GENI_SE_DMA_DONE_EN;
val |= GENI_SE_DMA_EOT_EN;
val |= GENI_SE_DMA_AHB_ERR_EN;
writel_relaxed(val, se->base + SE_DMA_TX_IRQ_EN_SET);
writel_relaxed(lower_32_bits(*iova), se->base + SE_DMA_TX_PTR_L);
writel_relaxed(upper_32_bits(*iova), se->base + SE_DMA_TX_PTR_H);
writel_relaxed(GENI_SE_DMA_EOT_BUF, se->base + SE_DMA_TX_ATTR);
writel_relaxed(len, se->base + SE_DMA_TX_LEN);
return 0;
}
EXPORT_SYMBOL(geni_se_tx_dma_prep);
/**
* geni_se_rx_dma_prep() - Prepare the serial engine for RX DMA transfer
* @se: Pointer to the concerned serial engine.
* @buf: Pointer to the RX buffer.
* @len: Length of the RX buffer.
* @iova: Pointer to store the mapped DMA address.
*
* This function is used to prepare the buffers for DMA RX.
*
* Return: 0 on success, standard Linux error codes on failure.
*/
int geni_se_rx_dma_prep(struct geni_se *se, void *buf, size_t len,
dma_addr_t *iova)
{
struct geni_wrapper *wrapper = se->wrapper;
u32 val;
*iova = dma_map_single(wrapper->dev, buf, len, DMA_FROM_DEVICE);
if (dma_mapping_error(wrapper->dev, *iova))
return -EIO;
val = GENI_SE_DMA_DONE_EN;
val |= GENI_SE_DMA_EOT_EN;
val |= GENI_SE_DMA_AHB_ERR_EN;
writel_relaxed(val, se->base + SE_DMA_RX_IRQ_EN_SET);
writel_relaxed(lower_32_bits(*iova), se->base + SE_DMA_RX_PTR_L);
writel_relaxed(upper_32_bits(*iova), se->base + SE_DMA_RX_PTR_H);
/* RX does not have EOT buffer type bit. So just reset RX_ATTR */
writel_relaxed(0, se->base + SE_DMA_RX_ATTR);
writel_relaxed(len, se->base + SE_DMA_RX_LEN);
return 0;
}
EXPORT_SYMBOL(geni_se_rx_dma_prep);
/**
* geni_se_tx_dma_unprep() - Unprepare the serial engine after TX DMA transfer
* @se: Pointer to the concerned serial engine.
* @iova: DMA address of the TX buffer.
* @len: Length of the TX buffer.
*
* This function is used to unprepare the DMA buffers after DMA TX.
*/
void geni_se_tx_dma_unprep(struct geni_se *se, dma_addr_t iova, size_t len)
{
struct geni_wrapper *wrapper = se->wrapper;
if (iova && !dma_mapping_error(wrapper->dev, iova))
dma_unmap_single(wrapper->dev, iova, len, DMA_TO_DEVICE);
}
EXPORT_SYMBOL(geni_se_tx_dma_unprep);
/**
* geni_se_rx_dma_unprep() - Unprepare the serial engine after RX DMA transfer
* @se: Pointer to the concerned serial engine.
* @iova: DMA address of the RX buffer.
* @len: Length of the RX buffer.
*
* This function is used to unprepare the DMA buffers after DMA RX.
*/
void geni_se_rx_dma_unprep(struct geni_se *se, dma_addr_t iova, size_t len)
{
struct geni_wrapper *wrapper = se->wrapper;
if (iova && !dma_mapping_error(wrapper->dev, iova))
dma_unmap_single(wrapper->dev, iova, len, DMA_FROM_DEVICE);
}
EXPORT_SYMBOL(geni_se_rx_dma_unprep);
static int geni_se_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *res;
struct geni_wrapper *wrapper;
int ret;
wrapper = devm_kzalloc(dev, sizeof(*wrapper), GFP_KERNEL);
if (!wrapper)
return -ENOMEM;
wrapper->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
wrapper->base = devm_ioremap_resource(dev, res);
if (IS_ERR(wrapper->base))
return PTR_ERR(wrapper->base);
wrapper->ahb_clks[0].id = "m-ahb";
wrapper->ahb_clks[1].id = "s-ahb";
ret = devm_clk_bulk_get(dev, NUM_AHB_CLKS, wrapper->ahb_clks);
if (ret) {
dev_err(dev, "Err getting AHB clks %d\n", ret);
return ret;
}
dev_set_drvdata(dev, wrapper);
dev_dbg(dev, "GENI SE Driver probed\n");
return devm_of_platform_populate(dev);
}
static const struct of_device_id geni_se_dt_match[] = {
{ .compatible = "qcom,geni-se-qup", },
{}
};
MODULE_DEVICE_TABLE(of, geni_se_dt_match);
static struct platform_driver geni_se_driver = {
.driver = {
.name = "geni_se_qup",
.of_match_table = geni_se_dt_match,
},
.probe = geni_se_probe,
};
module_platform_driver(geni_se_driver);
MODULE_DESCRIPTION("GENI Serial Engine Driver");
MODULE_LICENSE("GPL v2");

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include/linux/qcom-geni-se.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
*/
#ifndef _LINUX_QCOM_GENI_SE
#define _LINUX_QCOM_GENI_SE
/* Transfer mode supported by GENI Serial Engines */
enum geni_se_xfer_mode {
GENI_SE_INVALID,
GENI_SE_FIFO,
GENI_SE_DMA,
};
/* Protocols supported by GENI Serial Engines */
enum geni_se_protocol_type {
GENI_SE_NONE,
GENI_SE_SPI,
GENI_SE_UART,
GENI_SE_I2C,
GENI_SE_I3C,
};
struct geni_wrapper;
struct clk;
/**
* struct geni_se - GENI Serial Engine
* @base: Base Address of the Serial Engine's register block
* @dev: Pointer to the Serial Engine device
* @wrapper: Pointer to the parent QUP Wrapper core
* @clk: Handle to the core serial engine clock
* @num_clk_levels: Number of valid clock levels in clk_perf_tbl
* @clk_perf_tbl: Table of clock frequency input to serial engine clock
*/
struct geni_se {
void __iomem *base;
struct device *dev;
struct geni_wrapper *wrapper;
struct clk *clk;
unsigned int num_clk_levels;
unsigned long *clk_perf_tbl;
};
/* Common SE registers */
#define GENI_FORCE_DEFAULT_REG 0x20
#define SE_GENI_STATUS 0x40
#define GENI_SER_M_CLK_CFG 0x48
#define GENI_SER_S_CLK_CFG 0x4c
#define GENI_FW_REVISION_RO 0x68
#define SE_GENI_CLK_SEL 0x7c
#define SE_GENI_DMA_MODE_EN 0x258
#define SE_GENI_M_CMD0 0x600
#define SE_GENI_M_CMD_CTRL_REG 0x604
#define SE_GENI_M_IRQ_STATUS 0x610
#define SE_GENI_M_IRQ_EN 0x614
#define SE_GENI_M_IRQ_CLEAR 0x618
#define SE_GENI_S_CMD0 0x630
#define SE_GENI_S_CMD_CTRL_REG 0x634
#define SE_GENI_S_IRQ_STATUS 0x640
#define SE_GENI_S_IRQ_EN 0x644
#define SE_GENI_S_IRQ_CLEAR 0x648
#define SE_GENI_TX_FIFOn 0x700
#define SE_GENI_RX_FIFOn 0x780
#define SE_GENI_TX_FIFO_STATUS 0x800
#define SE_GENI_RX_FIFO_STATUS 0x804
#define SE_GENI_TX_WATERMARK_REG 0x80c
#define SE_GENI_RX_WATERMARK_REG 0x810
#define SE_GENI_RX_RFR_WATERMARK_REG 0x814
#define SE_GENI_IOS 0x908
#define SE_DMA_TX_IRQ_STAT 0xc40
#define SE_DMA_TX_IRQ_CLR 0xc44
#define SE_DMA_TX_FSM_RST 0xc58
#define SE_DMA_RX_IRQ_STAT 0xd40
#define SE_DMA_RX_IRQ_CLR 0xd44
#define SE_DMA_RX_FSM_RST 0xd58
#define SE_HW_PARAM_0 0xe24
#define SE_HW_PARAM_1 0xe28
/* GENI_FORCE_DEFAULT_REG fields */
#define FORCE_DEFAULT BIT(0)
/* GENI_STATUS fields */
#define M_GENI_CMD_ACTIVE BIT(0)
#define S_GENI_CMD_ACTIVE BIT(12)
/* GENI_SER_M_CLK_CFG/GENI_SER_S_CLK_CFG */
#define SER_CLK_EN BIT(0)
#define CLK_DIV_MSK GENMASK(15, 4)
#define CLK_DIV_SHFT 4
/* GENI_FW_REVISION_RO fields */
#define FW_REV_PROTOCOL_MSK GENMASK(15, 8)
#define FW_REV_PROTOCOL_SHFT 8
/* GENI_CLK_SEL fields */
#define CLK_SEL_MSK GENMASK(2, 0)
/* SE_GENI_DMA_MODE_EN */
#define GENI_DMA_MODE_EN BIT(0)
/* GENI_M_CMD0 fields */
#define M_OPCODE_MSK GENMASK(31, 27)
#define M_OPCODE_SHFT 27
#define M_PARAMS_MSK GENMASK(26, 0)
/* GENI_M_CMD_CTRL_REG */
#define M_GENI_CMD_CANCEL BIT(2)
#define M_GENI_CMD_ABORT BIT(1)
#define M_GENI_DISABLE BIT(0)
/* GENI_S_CMD0 fields */
#define S_OPCODE_MSK GENMASK(31, 27)
#define S_OPCODE_SHFT 27
#define S_PARAMS_MSK GENMASK(26, 0)
/* GENI_S_CMD_CTRL_REG */
#define S_GENI_CMD_CANCEL BIT(2)
#define S_GENI_CMD_ABORT BIT(1)
#define S_GENI_DISABLE BIT(0)
/* GENI_M_IRQ_EN fields */
#define M_CMD_DONE_EN BIT(0)
#define M_CMD_OVERRUN_EN BIT(1)
#define M_ILLEGAL_CMD_EN BIT(2)
#define M_CMD_FAILURE_EN BIT(3)
#define M_CMD_CANCEL_EN BIT(4)
#define M_CMD_ABORT_EN BIT(5)
#define M_TIMESTAMP_EN BIT(6)
#define M_RX_IRQ_EN BIT(7)
#define M_GP_SYNC_IRQ_0_EN BIT(8)
#define M_GP_IRQ_0_EN BIT(9)
#define M_GP_IRQ_1_EN BIT(10)
#define M_GP_IRQ_2_EN BIT(11)
#define M_GP_IRQ_3_EN BIT(12)
#define M_GP_IRQ_4_EN BIT(13)
#define M_GP_IRQ_5_EN BIT(14)
#define M_IO_DATA_DEASSERT_EN BIT(22)
#define M_IO_DATA_ASSERT_EN BIT(23)
#define M_RX_FIFO_RD_ERR_EN BIT(24)
#define M_RX_FIFO_WR_ERR_EN BIT(25)
#define M_RX_FIFO_WATERMARK_EN BIT(26)
#define M_RX_FIFO_LAST_EN BIT(27)
#define M_TX_FIFO_RD_ERR_EN BIT(28)
#define M_TX_FIFO_WR_ERR_EN BIT(29)
#define M_TX_FIFO_WATERMARK_EN BIT(30)
#define M_SEC_IRQ_EN BIT(31)
#define M_COMMON_GENI_M_IRQ_EN (GENMASK(6, 1) | \
M_IO_DATA_DEASSERT_EN | \
M_IO_DATA_ASSERT_EN | M_RX_FIFO_RD_ERR_EN | \
M_RX_FIFO_WR_ERR_EN | M_TX_FIFO_RD_ERR_EN | \
M_TX_FIFO_WR_ERR_EN)
/* GENI_S_IRQ_EN fields */
#define S_CMD_DONE_EN BIT(0)
#define S_CMD_OVERRUN_EN BIT(1)
#define S_ILLEGAL_CMD_EN BIT(2)
#define S_CMD_FAILURE_EN BIT(3)
#define S_CMD_CANCEL_EN BIT(4)
#define S_CMD_ABORT_EN BIT(5)
#define S_GP_SYNC_IRQ_0_EN BIT(8)
#define S_GP_IRQ_0_EN BIT(9)
#define S_GP_IRQ_1_EN BIT(10)
#define S_GP_IRQ_2_EN BIT(11)
#define S_GP_IRQ_3_EN BIT(12)
#define S_GP_IRQ_4_EN BIT(13)
#define S_GP_IRQ_5_EN BIT(14)
#define S_IO_DATA_DEASSERT_EN BIT(22)
#define S_IO_DATA_ASSERT_EN BIT(23)
#define S_RX_FIFO_RD_ERR_EN BIT(24)
#define S_RX_FIFO_WR_ERR_EN BIT(25)
#define S_RX_FIFO_WATERMARK_EN BIT(26)
#define S_RX_FIFO_LAST_EN BIT(27)
#define S_COMMON_GENI_S_IRQ_EN (GENMASK(5, 1) | GENMASK(13, 9) | \
S_RX_FIFO_RD_ERR_EN | S_RX_FIFO_WR_ERR_EN)
/* GENI_/TX/RX/RX_RFR/_WATERMARK_REG fields */
#define WATERMARK_MSK GENMASK(5, 0)
/* GENI_TX_FIFO_STATUS fields */
#define TX_FIFO_WC GENMASK(27, 0)
/* GENI_RX_FIFO_STATUS fields */
#define RX_LAST BIT(31)
#define RX_LAST_BYTE_VALID_MSK GENMASK(30, 28)
#define RX_LAST_BYTE_VALID_SHFT 28
#define RX_FIFO_WC_MSK GENMASK(24, 0)
/* SE_GENI_IOS fields */
#define IO2_DATA_IN BIT(1)
#define RX_DATA_IN BIT(0)
/* SE_DMA_TX_IRQ_STAT Register fields */
#define TX_DMA_DONE BIT(0)
#define TX_EOT BIT(1)
#define TX_SBE BIT(2)
#define TX_RESET_DONE BIT(3)
/* SE_DMA_RX_IRQ_STAT Register fields */
#define RX_DMA_DONE BIT(0)
#define RX_EOT BIT(1)
#define RX_SBE BIT(2)
#define RX_RESET_DONE BIT(3)
#define RX_FLUSH_DONE BIT(4)
#define RX_GENI_GP_IRQ GENMASK(10, 5)
#define RX_GENI_CANCEL_IRQ BIT(11)
#define RX_GENI_GP_IRQ_EXT GENMASK(13, 12)
/* SE_HW_PARAM_0 fields */
#define TX_FIFO_WIDTH_MSK GENMASK(29, 24)
#define TX_FIFO_WIDTH_SHFT 24
#define TX_FIFO_DEPTH_MSK GENMASK(21, 16)
#define TX_FIFO_DEPTH_SHFT 16
/* SE_HW_PARAM_1 fields */
#define RX_FIFO_WIDTH_MSK GENMASK(29, 24)
#define RX_FIFO_WIDTH_SHFT 24
#define RX_FIFO_DEPTH_MSK GENMASK(21, 16)
#define RX_FIFO_DEPTH_SHFT 16
#define HW_VER_MAJOR_MASK GENMASK(31, 28)
#define HW_VER_MAJOR_SHFT 28
#define HW_VER_MINOR_MASK GENMASK(27, 16)
#define HW_VER_MINOR_SHFT 16
#define HW_VER_STEP_MASK GENMASK(15, 0)
#if IS_ENABLED(CONFIG_QCOM_GENI_SE)
u32 geni_se_get_qup_hw_version(struct geni_se *se);
#define geni_se_get_wrapper_version(se, major, minor, step) do { \
u32 ver; \
\
ver = geni_se_get_qup_hw_version(se); \
major = (ver & HW_VER_MAJOR_MASK) >> HW_VER_MAJOR_SHFT; \
minor = (ver & HW_VER_MINOR_MASK) >> HW_VER_MINOR_SHFT; \
step = version & HW_VER_STEP_MASK; \
} while (0)
/**
* geni_se_read_proto() - Read the protocol configured for a serial engine
* @se: Pointer to the concerned serial engine.
*
* Return: Protocol value as configured in the serial engine.
*/
static inline u32 geni_se_read_proto(struct geni_se *se)
{
u32 val;
val = readl_relaxed(se->base + GENI_FW_REVISION_RO);
return (val & FW_REV_PROTOCOL_MSK) >> FW_REV_PROTOCOL_SHFT;
}
/**
* geni_se_setup_m_cmd() - Setup the primary sequencer
* @se: Pointer to the concerned serial engine.
* @cmd: Command/Operation to setup in the primary sequencer.
* @params: Parameter for the sequencer command.
*
* This function is used to configure the primary sequencer with the
* command and its associated parameters.
*/
static inline void geni_se_setup_m_cmd(struct geni_se *se, u32 cmd, u32 params)
{
u32 m_cmd;
m_cmd = (cmd << M_OPCODE_SHFT) | (params & M_PARAMS_MSK);
writel_relaxed(m_cmd, se->base + SE_GENI_M_CMD0);
}
/**
* geni_se_setup_s_cmd() - Setup the secondary sequencer
* @se: Pointer to the concerned serial engine.
* @cmd: Command/Operation to setup in the secondary sequencer.
* @params: Parameter for the sequencer command.
*
* This function is used to configure the secondary sequencer with the
* command and its associated parameters.
*/
static inline void geni_se_setup_s_cmd(struct geni_se *se, u32 cmd, u32 params)
{
u32 s_cmd;
s_cmd = readl_relaxed(se->base + SE_GENI_S_CMD0);
s_cmd &= ~(S_OPCODE_MSK | S_PARAMS_MSK);
s_cmd |= (cmd << S_OPCODE_SHFT);
s_cmd |= (params & S_PARAMS_MSK);
writel_relaxed(s_cmd, se->base + SE_GENI_S_CMD0);
}
/**
* geni_se_cancel_m_cmd() - Cancel the command configured in the primary
* sequencer
* @se: Pointer to the concerned serial engine.
*
* This function is used to cancel the currently configured command in the
* primary sequencer.
*/
static inline void geni_se_cancel_m_cmd(struct geni_se *se)
{
writel_relaxed(M_GENI_CMD_CANCEL, se->base + SE_GENI_M_CMD_CTRL_REG);
}
/**
* geni_se_cancel_s_cmd() - Cancel the command configured in the secondary
* sequencer
* @se: Pointer to the concerned serial engine.
*
* This function is used to cancel the currently configured command in the
* secondary sequencer.
*/
static inline void geni_se_cancel_s_cmd(struct geni_se *se)
{
writel_relaxed(S_GENI_CMD_CANCEL, se->base + SE_GENI_S_CMD_CTRL_REG);
}
/**
* geni_se_abort_m_cmd() - Abort the command configured in the primary sequencer
* @se: Pointer to the concerned serial engine.
*
* This function is used to force abort the currently configured command in the
* primary sequencer.
*/
static inline void geni_se_abort_m_cmd(struct geni_se *se)
{
writel_relaxed(M_GENI_CMD_ABORT, se->base + SE_GENI_M_CMD_CTRL_REG);
}
/**
* geni_se_abort_s_cmd() - Abort the command configured in the secondary
* sequencer
* @se: Pointer to the concerned serial engine.
*
* This function is used to force abort the currently configured command in the
* secondary sequencer.
*/
static inline void geni_se_abort_s_cmd(struct geni_se *se)
{
writel_relaxed(S_GENI_CMD_ABORT, se->base + SE_GENI_S_CMD_CTRL_REG);
}
/**
* geni_se_get_tx_fifo_depth() - Get the TX fifo depth of the serial engine
* @se: Pointer to the concerned serial engine.
*
* This function is used to get the depth i.e. number of elements in the
* TX fifo of the serial engine.
*
* Return: TX fifo depth in units of FIFO words.
*/
static inline u32 geni_se_get_tx_fifo_depth(struct geni_se *se)
{
u32 val;
val = readl_relaxed(se->base + SE_HW_PARAM_0);
return (val & TX_FIFO_DEPTH_MSK) >> TX_FIFO_DEPTH_SHFT;
}
/**
* geni_se_get_tx_fifo_width() - Get the TX fifo width of the serial engine
* @se: Pointer to the concerned serial engine.
*
* This function is used to get the width i.e. word size per element in the
* TX fifo of the serial engine.
*
* Return: TX fifo width in bits
*/
static inline u32 geni_se_get_tx_fifo_width(struct geni_se *se)
{
u32 val;
val = readl_relaxed(se->base + SE_HW_PARAM_0);
return (val & TX_FIFO_WIDTH_MSK) >> TX_FIFO_WIDTH_SHFT;
}
/**
* geni_se_get_rx_fifo_depth() - Get the RX fifo depth of the serial engine
* @se: Pointer to the concerned serial engine.
*
* This function is used to get the depth i.e. number of elements in the
* RX fifo of the serial engine.
*
* Return: RX fifo depth in units of FIFO words
*/
static inline u32 geni_se_get_rx_fifo_depth(struct geni_se *se)
{
u32 val;
val = readl_relaxed(se->base + SE_HW_PARAM_1);
return (val & RX_FIFO_DEPTH_MSK) >> RX_FIFO_DEPTH_SHFT;
}
void geni_se_init(struct geni_se *se, u32 rx_wm, u32 rx_rfr);
void geni_se_select_mode(struct geni_se *se, enum geni_se_xfer_mode mode);
void geni_se_config_packing(struct geni_se *se, int bpw, int pack_words,
bool msb_to_lsb, bool tx_cfg, bool rx_cfg);
int geni_se_resources_off(struct geni_se *se);
int geni_se_resources_on(struct geni_se *se);
int geni_se_clk_tbl_get(struct geni_se *se, unsigned long **tbl);
int geni_se_clk_freq_match(struct geni_se *se, unsigned long req_freq,
unsigned int *index, unsigned long *res_freq,
bool exact);
int geni_se_tx_dma_prep(struct geni_se *se, void *buf, size_t len,
dma_addr_t *iova);
int geni_se_rx_dma_prep(struct geni_se *se, void *buf, size_t len,
dma_addr_t *iova);
void geni_se_tx_dma_unprep(struct geni_se *se, dma_addr_t iova, size_t len);
void geni_se_rx_dma_unprep(struct geni_se *se, dma_addr_t iova, size_t len);
#endif
#endif