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895b9be378
Linux-6.18.2/drivers/soc/qcom/qcom-geni-se.c
zhji 895b9be378 [feat] fisrst commit of linux-6.18.2
2025-12-23 20:06:59 +08:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
*/
/* Disable MMIO tracing to prevent excessive logging of unwanted MMIO traces */
#define __DISABLE_TRACE_MMIO__
#include <linux/acpi.h>
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/firmware.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/soc/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 MAX_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
* @clks: Handle to the primary & optional secondary AHB clocks
* @num_clks: Count of clocks
*/
struct geni_wrapper {
struct device *dev;
void __iomem *base;
struct clk_bulk_data clks[MAX_CLKS];
unsigned int num_clks;
};
/**
* struct geni_se_desc - Data structure to represent the QUP Wrapper resources
* @clks: Name of the primary & optional secondary AHB clocks
* @num_clks: Count of clock names
*/
struct geni_se_desc {
unsigned int num_clks;
const char * const *clks;
};
static const char * const icc_path_names[] = {"qup-core", "qup-config",
"qup-memory"};
static const char * const protocol_name[] = { "None", "SPI", "UART", "I2C", "I3C", "SPI SLAVE" };
/**
* struct se_fw_hdr - Serial Engine firmware configuration header
*
* This structure defines the SE firmware header, which together with the
* firmware payload is stored in individual ELF segments.
*
* @magic: Set to 'SEFW'.
* @version: Structure version number.
* @core_version: QUPV3 hardware version.
* @serial_protocol: Encoded in GENI_FW_REVISION.
* @fw_version: Firmware version, from GENI_FW_REVISION.
* @cfg_version: Configuration version, from GENI_INIT_CFG_REVISION.
* @fw_size_in_items: Number of 32-bit words in GENI_FW_RAM.
* @fw_offset: Byte offset to GENI_FW_RAM array.
* @cfg_size_in_items: Number of GENI_FW_CFG index/value pairs.
* @cfg_idx_offset: Byte offset to GENI_FW_CFG index array.
* @cfg_val_offset: Byte offset to GENI_FW_CFG values array.
*/
struct se_fw_hdr {
__le32 magic;
__le32 version;
__le32 core_version;
__le16 serial_protocol;
__le16 fw_version;
__le16 cfg_version;
__le16 fw_size_in_items;
__le16 fw_offset;
__le16 cfg_size_in_items;
__le16 cfg_idx_offset;
__le16 cfg_val_offset;
};
/*Magic numbers*/
#define SE_MAGIC_NUM 0x57464553
#define MAX_GENI_CFG_RAMn_CNT 455
#define MI_PBT_NON_PAGED_SEGMENT 0x0
#define MI_PBT_HASH_SEGMENT 0x2
#define MI_PBT_NOTUSED_SEGMENT 0x3
#define MI_PBT_SHARED_SEGMENT 0x4
#define MI_PBT_FLAG_PAGE_MODE BIT(20)
#define MI_PBT_FLAG_SEGMENT_TYPE GENMASK(26, 24)
#define MI_PBT_FLAG_ACCESS_TYPE GENMASK(23, 21)
#define MI_PBT_PAGE_MODE_VALUE(x) FIELD_GET(MI_PBT_FLAG_PAGE_MODE, x)
#define MI_PBT_SEGMENT_TYPE_VALUE(x) FIELD_GET(MI_PBT_FLAG_SEGMENT_TYPE, x)
#define MI_PBT_ACCESS_TYPE_VALUE(x) FIELD_GET(MI_PBT_FLAG_ACCESS_TYPE, x)
#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)
/* Common QUPV3 registers */
#define QUPV3_HW_VER_REG 0x4
#define QUPV3_SE_AHB_M_CFG 0x118
#define QUPV3_COMMON_CFG 0x120
#define QUPV3_COMMON_CGC_CTRL 0x21c
/* QUPV3_COMMON_CFG fields */
#define FAST_SWITCH_TO_HIGH_DISABLE BIT(0)
/* QUPV3_SE_AHB_M_CFG fields */
#define AHB_M_CLK_CGC_ON BIT(0)
/* QUPV3_COMMON_CGC_CTRL fields */
#define COMMON_CSR_SLV_CLK_CGC_ON BIT(0)
/* Common SE registers */
#define SE_GENI_INIT_CFG_REVISION 0x0
#define SE_GENI_S_INIT_CFG_REVISION 0x4
#define SE_GENI_CGC_CTRL 0x28
#define SE_GENI_CLK_CTRL_RO 0x60
#define SE_GENI_FW_S_REVISION_RO 0x6c
#define SE_GENI_CFG_REG0 0x100
#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_S_IRQ_ENABLE 0x644
#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_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
#define SE_GENI_FW_REVISION 0x1000
#define SE_GENI_S_FW_REVISION 0x1004
#define SE_GENI_CFG_RAMN 0x1010
#define SE_GENI_CLK_CTRL 0x2000
#define SE_DMA_IF_EN 0x2004
#define SE_FIFO_IF_DISABLE 0x2008
/* GENI_FW_REVISION_RO fields */
#define FW_REV_VERSION_MSK GENMASK(7, 0)
/* 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_CLK_CGC_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_CLK_CTRL fields */
#define SER_CLK_SEL BIT(0)
/* GENI_DMA_IF_EN fields */
#define DMA_IF_EN BIT(0)
#define geni_setbits32(_addr, _v) writel(readl(_addr) | (_v), _addr)
#define geni_clrbits32(_addr, _v) writel(readl(_addr) & ~(_v), _addr)
/**
* 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 + QUPV3_HW_VER_REG);
}
EXPORT_SYMBOL_GPL(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 + SE_GENI_CGC_CTRL);
val |= DEFAULT_CGC_EN;
writel_relaxed(val, base + SE_GENI_CGC_CTRL);
val = readl_relaxed(base + SE_DMA_GENERAL_CFG);
val |= AHB_SEC_SLV_CLK_CGC_ON | DMA_AHB_SLV_CLK_CGC_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);
}
static void geni_se_irq_clear(struct geni_se *se)
{
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);
}
/**
* 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: 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_irq_clear(se);
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_GPL(geni_se_init);
static void geni_se_select_fifo_mode(struct geni_se *se)
{
u32 proto = geni_se_read_proto(se);
u32 val, val_old;
geni_se_irq_clear(se);
/* UART driver manages enabling / disabling interrupts internally */
if (proto != GENI_SE_UART) {
/* Non-UART use only primary sequencer so dont bother about S_IRQ */
val_old = val = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
val |= M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN;
val |= M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN;
if (val != val_old)
writel_relaxed(val, se->base + SE_GENI_M_IRQ_EN);
}
val_old = val = readl_relaxed(se->base + SE_GENI_DMA_MODE_EN);
val &= ~GENI_DMA_MODE_EN;
if (val != val_old)
writel_relaxed(val, se->base + SE_GENI_DMA_MODE_EN);
}
static void geni_se_select_dma_mode(struct geni_se *se)
{
u32 proto = geni_se_read_proto(se);
u32 val, val_old;
geni_se_irq_clear(se);
/* UART driver manages enabling / disabling interrupts internally */
if (proto != GENI_SE_UART) {
/* Non-UART use only primary sequencer so dont bother about S_IRQ */
val_old = val = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
val &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN);
val &= ~(M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
if (val != val_old)
writel_relaxed(val, se->base + SE_GENI_M_IRQ_EN);
}
val_old = val = readl_relaxed(se->base + SE_GENI_DMA_MODE_EN);
val |= GENI_DMA_MODE_EN;
if (val != val_old)
writel_relaxed(val, se->base + SE_GENI_DMA_MODE_EN);
}
static void geni_se_select_gpi_mode(struct geni_se *se)
{
u32 val;
geni_se_irq_clear(se);
writel(0, se->base + SE_IRQ_EN);
val = readl(se->base + SE_GENI_M_IRQ_EN);
val &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN |
M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
writel(val, se->base + SE_GENI_M_IRQ_EN);
writel(GENI_DMA_MODE_EN, se->base + SE_GENI_DMA_MODE_EN);
val = readl(se->base + SE_GSI_EVENT_EN);
val |= (DMA_RX_EVENT_EN | DMA_TX_EVENT_EN | GENI_M_EVENT_EN | GENI_S_EVENT_EN);
writel(val, se->base + SE_GSI_EVENT_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 && mode != GENI_GPI_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_GPI_DMA:
geni_se_select_gpi_mode(se);
break;
case GENI_SE_INVALID:
default:
break;
}
}
EXPORT_SYMBOL_GPL(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_GPL(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(wrapper->num_clks, wrapper->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;
if (has_acpi_companion(se->dev))
return 0;
ret = pinctrl_pm_select_sleep_state(se->dev);
if (ret)
return ret;
geni_se_clks_off(se);
return 0;
}
EXPORT_SYMBOL_GPL(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(wrapper->num_clks, wrapper->clks);
if (ret)
return ret;
ret = clk_prepare_enable(se->clk);
if (ret)
clk_bulk_disable_unprepare(wrapper->num_clks, wrapper->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;
if (has_acpi_companion(se->dev))
return 0;
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_GPL(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)
{
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 <= 0 ||
(i > 0 && 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_GPL(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 of the source clock.
* @exact: Flag to indicate exact multiple requirement of the requested
* frequency.
*
* This function is called by the protocol drivers to determine the best match
* of the requested frequency as provided by the serial engine clock in order
* to meet the performance requirements.
*
* If we return success:
* - if @exact is true then @res_freq / <an_integer> == @req_freq
* - if @exact is false then @res_freq / <an_integer> <= @req_freq
*
* 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;
unsigned long best_delta;
unsigned long new_delta;
unsigned int divider;
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;
best_delta = ULONG_MAX;
for (i = 0; i < num_clk_levels; i++) {
divider = DIV_ROUND_UP(tbl[i], req_freq);
new_delta = req_freq - tbl[i] / divider;
if (new_delta < best_delta) {
/* We have a new best! */
*index = i;
*res_freq = tbl[i];
/* If the new best is exact then we're done */
if (new_delta == 0)
return 0;
/* Record how close we got */
best_delta = new_delta;
}
}
if (exact)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL_GPL(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_RESET_DONE_EN BIT(3)
#define GENI_SE_DMA_FLUSH_DONE BIT(4)
#define GENI_SE_DMA_EOT_BUF BIT(0)
/**
* geni_se_tx_init_dma() - Initiate TX DMA transfer on the serial engine
* @se: Pointer to the concerned serial engine.
* @iova: Mapped DMA address.
* @len: Length of the TX buffer.
*
* This function is used to initiate DMA TX transfer.
*/
void geni_se_tx_init_dma(struct geni_se *se, dma_addr_t iova, size_t len)
{
u32 val;
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(len, se->base + SE_DMA_TX_LEN);
}
EXPORT_SYMBOL_GPL(geni_se_tx_init_dma);
/**
* 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;
if (!wrapper)
return -EINVAL;
*iova = dma_map_single(wrapper->dev, buf, len, DMA_TO_DEVICE);
if (dma_mapping_error(wrapper->dev, *iova))
return -EIO;
geni_se_tx_init_dma(se, *iova, len);
return 0;
}
EXPORT_SYMBOL_GPL(geni_se_tx_dma_prep);
/**
* geni_se_rx_init_dma() - Initiate RX DMA transfer on the serial engine
* @se: Pointer to the concerned serial engine.
* @iova: Mapped DMA address.
* @len: Length of the RX buffer.
*
* This function is used to initiate DMA RX transfer.
*/
void geni_se_rx_init_dma(struct geni_se *se, dma_addr_t iova, size_t len)
{
u32 val;
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(len, se->base + SE_DMA_RX_LEN);
}
EXPORT_SYMBOL_GPL(geni_se_rx_init_dma);
/**
* 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;
if (!wrapper)
return -EINVAL;
*iova = dma_map_single(wrapper->dev, buf, len, DMA_FROM_DEVICE);
if (dma_mapping_error(wrapper->dev, *iova))
return -EIO;
geni_se_rx_init_dma(se, *iova, len);
return 0;
}
EXPORT_SYMBOL_GPL(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 (!dma_mapping_error(wrapper->dev, iova))
dma_unmap_single(wrapper->dev, iova, len, DMA_TO_DEVICE);
}
EXPORT_SYMBOL_GPL(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 (!dma_mapping_error(wrapper->dev, iova))
dma_unmap_single(wrapper->dev, iova, len, DMA_FROM_DEVICE);
}
EXPORT_SYMBOL_GPL(geni_se_rx_dma_unprep);
int geni_icc_get(struct geni_se *se, const char *icc_ddr)
{
int i, err;
const char *icc_names[] = {"qup-core", "qup-config", icc_ddr};
if (has_acpi_companion(se->dev))
return 0;
for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
if (!icc_names[i])
continue;
se->icc_paths[i].path = devm_of_icc_get(se->dev, icc_names[i]);
if (IS_ERR(se->icc_paths[i].path))
goto err;
}
return 0;
err:
err = PTR_ERR(se->icc_paths[i].path);
if (err != -EPROBE_DEFER)
dev_err_ratelimited(se->dev, "Failed to get ICC path '%s': %d\n",
icc_names[i], err);
return err;
}
EXPORT_SYMBOL_GPL(geni_icc_get);
int geni_icc_set_bw(struct geni_se *se)
{
int i, ret;
for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
ret = icc_set_bw(se->icc_paths[i].path,
se->icc_paths[i].avg_bw, se->icc_paths[i].avg_bw);
if (ret) {
dev_err_ratelimited(se->dev, "ICC BW voting failed on path '%s': %d\n",
icc_path_names[i], ret);
return ret;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(geni_icc_set_bw);
void geni_icc_set_tag(struct geni_se *se, u32 tag)
{
int i;
for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++)
icc_set_tag(se->icc_paths[i].path, tag);
}
EXPORT_SYMBOL_GPL(geni_icc_set_tag);
/* To do: Replace this by icc_bulk_enable once it's implemented in ICC core */
int geni_icc_enable(struct geni_se *se)
{
int i, ret;
for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
ret = icc_enable(se->icc_paths[i].path);
if (ret) {
dev_err_ratelimited(se->dev, "ICC enable failed on path '%s': %d\n",
icc_path_names[i], ret);
return ret;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(geni_icc_enable);
int geni_icc_disable(struct geni_se *se)
{
int i, ret;
for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
ret = icc_disable(se->icc_paths[i].path);
if (ret) {
dev_err_ratelimited(se->dev, "ICC disable failed on path '%s': %d\n",
icc_path_names[i], ret);
return ret;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(geni_icc_disable);
/**
* geni_find_protocol_fw() - Locate and validate SE firmware for a protocol.
* @dev: Pointer to the device structure.
* @fw: Pointer to the firmware image.
* @protocol: Expected serial engine protocol type.
*
* Identifies the appropriate firmware image or configuration required for a
* specific communication protocol instance running on a Qualcomm GENI
* controller.
*
* Return: pointer to a valid 'struct se_fw_hdr' if found, or NULL otherwise.
*/
static struct se_fw_hdr *geni_find_protocol_fw(struct device *dev, const struct firmware *fw,
enum geni_se_protocol_type protocol)
{
const struct elf32_hdr *ehdr;
const struct elf32_phdr *phdrs;
const struct elf32_phdr *phdr;
struct se_fw_hdr *sefw;
u32 fw_end, cfg_idx_end, cfg_val_end;
u16 fw_size;
int i;
if (!fw || fw->size < sizeof(struct elf32_hdr))
return NULL;
ehdr = (const struct elf32_hdr *)fw->data;
phdrs = (const struct elf32_phdr *)(fw->data + ehdr->e_phoff);
/*
* The firmware is expected to have at least two program headers (segments).
* One for metadata and the other for the actual protocol-specific firmware.
*/
if (ehdr->e_phnum < 2) {
dev_err(dev, "Invalid firmware: less than 2 program headers\n");
return NULL;
}
for (i = 0; i < ehdr->e_phnum; i++) {
phdr = &phdrs[i];
if (fw->size < phdr->p_offset + phdr->p_filesz) {
dev_err(dev, "Firmware size (%zu) < expected offset (%u) + size (%u)\n",
fw->size, phdr->p_offset, phdr->p_filesz);
return NULL;
}
if (phdr->p_type != PT_LOAD || !phdr->p_memsz)
continue;
if (MI_PBT_PAGE_MODE_VALUE(phdr->p_flags) != MI_PBT_NON_PAGED_SEGMENT ||
MI_PBT_SEGMENT_TYPE_VALUE(phdr->p_flags) == MI_PBT_HASH_SEGMENT ||
MI_PBT_ACCESS_TYPE_VALUE(phdr->p_flags) == MI_PBT_NOTUSED_SEGMENT ||
MI_PBT_ACCESS_TYPE_VALUE(phdr->p_flags) == MI_PBT_SHARED_SEGMENT)
continue;
if (phdr->p_filesz < sizeof(struct se_fw_hdr))
continue;
sefw = (struct se_fw_hdr *)(fw->data + phdr->p_offset);
fw_size = le16_to_cpu(sefw->fw_size_in_items);
fw_end = le16_to_cpu(sefw->fw_offset) + fw_size * sizeof(u32);
cfg_idx_end = le16_to_cpu(sefw->cfg_idx_offset) +
le16_to_cpu(sefw->cfg_size_in_items) * sizeof(u8);
cfg_val_end = le16_to_cpu(sefw->cfg_val_offset) +
le16_to_cpu(sefw->cfg_size_in_items) * sizeof(u32);
if (le32_to_cpu(sefw->magic) != SE_MAGIC_NUM || le32_to_cpu(sefw->version) != 1)
continue;
if (le32_to_cpu(sefw->serial_protocol) != protocol)
continue;
if (fw_size % 2 != 0) {
fw_size++;
sefw->fw_size_in_items = cpu_to_le16(fw_size);
}
if (fw_size >= MAX_GENI_CFG_RAMn_CNT) {
dev_err(dev,
"Firmware size (%u) exceeds max allowed RAMn count (%u)\n",
fw_size, MAX_GENI_CFG_RAMn_CNT);
continue;
}
if (fw_end > phdr->p_filesz || cfg_idx_end > phdr->p_filesz ||
cfg_val_end > phdr->p_filesz) {
dev_err(dev, "Truncated or corrupt SE FW segment found at index %d\n", i);
continue;
}
return sefw;
}
dev_err(dev, "Failed to get %s protocol firmware\n", protocol_name[protocol]);
return NULL;
}
/**
* geni_configure_xfer_mode() - Set the transfer mode.
* @se: Pointer to the concerned serial engine.
* @mode: SE data transfer mode.
*
* Set the transfer mode to either FIFO or DMA according to the mode specified
* by the protocol driver.
*
* Return: 0 if successful, otherwise return an error value.
*/
static int geni_configure_xfer_mode(struct geni_se *se, enum geni_se_xfer_mode mode)
{
/* Configure SE FIFO, DMA or GSI mode. */
switch (mode) {
case GENI_GPI_DMA:
geni_setbits32(se->base + SE_GENI_DMA_MODE_EN, GENI_DMA_MODE_EN);
writel(0x0, se->base + SE_IRQ_EN);
writel(DMA_RX_EVENT_EN | DMA_TX_EVENT_EN | GENI_M_EVENT_EN | GENI_S_EVENT_EN,
se->base + SE_GSI_EVENT_EN);
break;
case GENI_SE_FIFO:
geni_clrbits32(se->base + SE_GENI_DMA_MODE_EN, GENI_DMA_MODE_EN);
writel(DMA_RX_IRQ_EN | DMA_TX_IRQ_EN | GENI_M_IRQ_EN | GENI_S_IRQ_EN,
se->base + SE_IRQ_EN);
writel(0x0, se->base + SE_GSI_EVENT_EN);
break;
case GENI_SE_DMA:
geni_setbits32(se->base + SE_GENI_DMA_MODE_EN, GENI_DMA_MODE_EN);
writel(DMA_RX_IRQ_EN | DMA_TX_IRQ_EN | GENI_M_IRQ_EN | GENI_S_IRQ_EN,
se->base + SE_IRQ_EN);
writel(0x0, se->base + SE_GSI_EVENT_EN);
break;
default:
dev_err(se->dev, "Invalid geni-se transfer mode: %d\n", mode);
return -EINVAL;
}
return 0;
}
/**
* geni_enable_interrupts() - Enable interrupts.
* @se: Pointer to the concerned serial engine.
*
* Enable the required interrupts during the firmware load process.
*/
static void geni_enable_interrupts(struct geni_se *se)
{
u32 val;
/* Enable required interrupts. */
writel(M_COMMON_GENI_M_IRQ_EN, se->base + SE_GENI_M_IRQ_EN);
val = S_CMD_OVERRUN_EN | S_ILLEGAL_CMD_EN | S_CMD_CANCEL_EN | S_CMD_ABORT_EN |
S_GP_IRQ_0_EN | S_GP_IRQ_1_EN | S_GP_IRQ_2_EN | S_GP_IRQ_3_EN |
S_RX_FIFO_WR_ERR_EN | S_RX_FIFO_RD_ERR_EN;
writel(val, se->base + SE_GENI_S_IRQ_ENABLE);
/* DMA mode configuration. */
val = GENI_SE_DMA_RESET_DONE_EN | GENI_SE_DMA_AHB_ERR_EN | GENI_SE_DMA_DONE_EN;
writel(val, se->base + SE_DMA_TX_IRQ_EN_SET);
val = GENI_SE_DMA_FLUSH_DONE | GENI_SE_DMA_RESET_DONE_EN | GENI_SE_DMA_AHB_ERR_EN |
GENI_SE_DMA_DONE_EN;
writel(val, se->base + SE_DMA_RX_IRQ_EN_SET);
}
/**
* geni_write_fw_revision() - Write the firmware revision.
* @se: Pointer to the concerned serial engine.
* @serial_protocol: serial protocol type.
* @fw_version: QUP firmware version.
*
* Write the firmware revision and protocol into the respective register.
*/
static void geni_write_fw_revision(struct geni_se *se, u16 serial_protocol, u16 fw_version)
{
u32 reg;
reg = FIELD_PREP(FW_REV_PROTOCOL_MSK, serial_protocol);
reg |= FIELD_PREP(FW_REV_VERSION_MSK, fw_version);
writel(reg, se->base + SE_GENI_FW_REVISION);
writel(reg, se->base + SE_GENI_S_FW_REVISION);
}
/**
* geni_load_se_fw() - Load Serial Engine specific firmware.
* @se: Pointer to the concerned serial engine.
* @fw: Pointer to the firmware structure.
* @mode: SE data transfer mode.
* @protocol: Protocol type to be used with the SE (e.g., UART, SPI, I2C).
*
* Load the protocol firmware into the IRAM of the Serial Engine.
*
* Return: 0 if successful, otherwise return an error value.
*/
static int geni_load_se_fw(struct geni_se *se, const struct firmware *fw,
enum geni_se_xfer_mode mode, enum geni_se_protocol_type protocol)
{
const u32 *fw_data, *cfg_val_arr;
const u8 *cfg_idx_arr;
u32 i, reg_value;
int ret;
struct se_fw_hdr *hdr;
hdr = geni_find_protocol_fw(se->dev, fw, protocol);
if (!hdr)
return -EINVAL;
fw_data = (const u32 *)((u8 *)hdr + le16_to_cpu(hdr->fw_offset));
cfg_idx_arr = (const u8 *)hdr + le16_to_cpu(hdr->cfg_idx_offset);
cfg_val_arr = (const u32 *)((u8 *)hdr + le16_to_cpu(hdr->cfg_val_offset));
ret = geni_icc_set_bw(se);
if (ret)
return ret;
ret = geni_icc_enable(se);
if (ret)
return ret;
ret = geni_se_resources_on(se);
if (ret)
goto out_icc_disable;
/*
* Disable high-priority interrupts until all currently executing
* low-priority interrupts have been fully handled.
*/
geni_setbits32(se->wrapper->base + QUPV3_COMMON_CFG, FAST_SWITCH_TO_HIGH_DISABLE);
/* Set AHB_M_CLK_CGC_ON to indicate hardware controls se-wrapper cgc clock. */
geni_setbits32(se->wrapper->base + QUPV3_SE_AHB_M_CFG, AHB_M_CLK_CGC_ON);
/* Let hardware to control common cgc. */
geni_setbits32(se->wrapper->base + QUPV3_COMMON_CGC_CTRL, COMMON_CSR_SLV_CLK_CGC_ON);
/*
* Setting individual bits in GENI_OUTPUT_CTRL activates corresponding output lines,
* allowing the hardware to drive data as configured.
*/
writel(0x0, se->base + GENI_OUTPUT_CTRL);
/* Set SCLK and HCLK to program RAM */
geni_setbits32(se->base + SE_GENI_CGC_CTRL, PROG_RAM_SCLK_OFF | PROG_RAM_HCLK_OFF);
writel(0x0, se->base + SE_GENI_CLK_CTRL);
geni_clrbits32(se->base + SE_GENI_CGC_CTRL, PROG_RAM_SCLK_OFF | PROG_RAM_HCLK_OFF);
/* Enable required clocks for DMA CSR, TX and RX. */
reg_value = AHB_SEC_SLV_CLK_CGC_ON | DMA_AHB_SLV_CLK_CGC_ON |
DMA_TX_CLK_CGC_ON | DMA_RX_CLK_CGC_ON;
geni_setbits32(se->base + SE_DMA_GENERAL_CFG, reg_value);
/* Let hardware control CGC by default. */
writel(DEFAULT_CGC_EN, se->base + SE_GENI_CGC_CTRL);
/* Set version of the configuration register part of firmware. */
writel(le16_to_cpu(hdr->cfg_version), se->base + SE_GENI_INIT_CFG_REVISION);
writel(le16_to_cpu(hdr->cfg_version), se->base + SE_GENI_S_INIT_CFG_REVISION);
/* Configure GENI primitive table. */
for (i = 0; i < le16_to_cpu(hdr->cfg_size_in_items); i++)
writel(cfg_val_arr[i],
se->base + SE_GENI_CFG_REG0 + (cfg_idx_arr[i] * sizeof(u32)));
/* Configure condition for assertion of RX_RFR_WATERMARK condition. */
reg_value = geni_se_get_rx_fifo_depth(se);
writel(reg_value - 2, se->base + SE_GENI_RX_RFR_WATERMARK_REG);
/* Let hardware control CGC */
geni_setbits32(se->base + GENI_OUTPUT_CTRL, DEFAULT_IO_OUTPUT_CTRL_MSK);
ret = geni_configure_xfer_mode(se, mode);
if (ret)
goto out_resources_off;
geni_enable_interrupts(se);
geni_write_fw_revision(se, le16_to_cpu(hdr->serial_protocol), le16_to_cpu(hdr->fw_version));
/* Program RAM address space. */
memcpy_toio(se->base + SE_GENI_CFG_RAMN, fw_data,
le16_to_cpu(hdr->fw_size_in_items) * sizeof(u32));
/* Put default values on GENI's output pads. */
writel_relaxed(0x1, se->base + GENI_FORCE_DEFAULT_REG);
/* Toggle SCLK/HCLK from high to low to finalize RAM programming and apply config. */
geni_setbits32(se->base + SE_GENI_CGC_CTRL, PROG_RAM_SCLK_OFF | PROG_RAM_HCLK_OFF);
geni_setbits32(se->base + SE_GENI_CLK_CTRL, SER_CLK_SEL);
geni_clrbits32(se->base + SE_GENI_CGC_CTRL, PROG_RAM_SCLK_OFF | PROG_RAM_HCLK_OFF);
/* Serial engine DMA interface is enabled. */
geni_setbits32(se->base + SE_DMA_IF_EN, DMA_IF_EN);
/* Enable or disable FIFO interface of the serial engine. */
if (mode == GENI_SE_FIFO)
geni_clrbits32(se->base + SE_FIFO_IF_DISABLE, FIFO_IF_DISABLE);
else
geni_setbits32(se->base + SE_FIFO_IF_DISABLE, FIFO_IF_DISABLE);
out_resources_off:
geni_se_resources_off(se);
out_icc_disable:
geni_icc_disable(se);
return ret;
}
/**
* geni_load_se_firmware() - Load firmware for SE based on protocol
* @se: Pointer to the concerned serial engine.
* @protocol: Protocol type to be used with the SE (e.g., UART, SPI, I2C).
*
* Retrieves the firmware name from device properties and sets the transfer mode
* (FIFO or GSI DMA) based on device tree configuration. Enforces FIFO mode for
* UART protocol due to lack of GSI DMA support. Requests the firmware and loads
* it into the SE.
*
* Return: 0 on success, negative error code on failure.
*/
int geni_load_se_firmware(struct geni_se *se, enum geni_se_protocol_type protocol)
{
const char *fw_name;
const struct firmware *fw;
enum geni_se_xfer_mode mode = GENI_SE_FIFO;
int ret;
if (protocol >= ARRAY_SIZE(protocol_name)) {
dev_err(se->dev, "Invalid geni-se protocol: %d", protocol);
return -EINVAL;
}
ret = device_property_read_string(se->wrapper->dev, "firmware-name", &fw_name);
if (ret) {
dev_err(se->dev, "Failed to read firmware-name property: %d\n", ret);
return -EINVAL;
}
if (of_property_read_bool(se->dev->of_node, "qcom,enable-gsi-dma"))
mode = GENI_GPI_DMA;
/* GSI mode is not supported by the UART driver; therefore, setting FIFO mode */
if (protocol == GENI_SE_UART)
mode = GENI_SE_FIFO;
ret = request_firmware(&fw, fw_name, se->dev);
if (ret) {
if (ret == -ENOENT)
return -EPROBE_DEFER;
dev_err(se->dev, "Failed to request firmware '%s' for protocol %d: ret: %d\n",
fw_name, protocol, ret);
return ret;
}
ret = geni_load_se_fw(se, fw, mode, protocol);
release_firmware(fw);
if (ret) {
dev_err(se->dev, "Failed to load SE firmware for protocol %d: ret: %d\n",
protocol, ret);
return ret;
}
dev_dbg(se->dev, "Firmware load for %s protocol is successful for xfer mode: %d\n",
protocol_name[protocol], mode);
return 0;
}
EXPORT_SYMBOL_GPL(geni_load_se_firmware);
static int geni_se_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct geni_wrapper *wrapper;
const struct geni_se_desc *desc;
int ret;
wrapper = devm_kzalloc(dev, sizeof(*wrapper), GFP_KERNEL);
if (!wrapper)
return -ENOMEM;
wrapper->dev = dev;
wrapper->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(wrapper->base))
return PTR_ERR(wrapper->base);
desc = device_get_match_data(&pdev->dev);
if (!has_acpi_companion(&pdev->dev) && desc->num_clks) {
int i;
wrapper->num_clks = min_t(unsigned int, desc->num_clks, MAX_CLKS);
for (i = 0; i < wrapper->num_clks; ++i)
wrapper->clks[i].id = desc->clks[i];
ret = of_count_phandle_with_args(dev->of_node, "clocks", "#clock-cells");
if (ret < 0) {
dev_err(dev, "invalid clocks property at %pOF\n", dev->of_node);
return ret;
}
if (ret < wrapper->num_clks) {
dev_err(dev, "invalid clocks count at %pOF, expected %d entries\n",
dev->of_node, wrapper->num_clks);
return -EINVAL;
}
ret = devm_clk_bulk_get(dev, wrapper->num_clks, wrapper->clks);
if (ret) {
dev_err(dev, "Err getting 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 char * const qup_clks[] = {
"m-ahb",
"s-ahb",
};
static const struct geni_se_desc qup_desc = {
.clks = qup_clks,
.num_clks = ARRAY_SIZE(qup_clks),
};
static const struct geni_se_desc sa8255p_qup_desc = {};
static const char * const i2c_master_hub_clks[] = {
"s-ahb",
};
static const struct geni_se_desc i2c_master_hub_desc = {
.clks = i2c_master_hub_clks,
.num_clks = ARRAY_SIZE(i2c_master_hub_clks),
};
static const struct of_device_id geni_se_dt_match[] = {
{ .compatible = "qcom,geni-se-qup", .data = &qup_desc },
{ .compatible = "qcom,geni-se-i2c-master-hub", .data = &i2c_master_hub_desc },
{ .compatible = "qcom,sa8255p-geni-se-qup", .data = &sa8255p_qup_desc },
{}
};
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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