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// 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;
|