diff options
| -rw-r--r-- | MAINTAINERS | 1 | ||||
| -rw-r--r-- | doc/device-tree-bindings/spi/spi-qup.txt | 33 | ||||
| -rw-r--r-- | drivers/spi/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/spi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/spi/spi-qup.c | 803 |
5 files changed, 848 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index 196d635bdd..d5a418d087 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -241,6 +241,7 @@ F: include/dt-bindings/clock/qcom,ipq4019-gcc.h F: include/dt-bindings/reset/qcom,ipq4019-reset.h F: drivers/reset/reset-ipq4019.c F: drivers/phy/phy-qcom-ipq4019-usb.c +F: drivers/spi/spi-qup.c ARM MARVELL KIRKWOOD ARMADA-XP ARMADA-38X ARMADA-37XX ARMADA-7K/8K M: Stefan Roese <sr@denx.de> diff --git a/doc/device-tree-bindings/spi/spi-qup.txt b/doc/device-tree-bindings/spi/spi-qup.txt new file mode 100644 index 0000000000..3697df2631 --- /dev/null +++ b/doc/device-tree-bindings/spi/spi-qup.txt @@ -0,0 +1,33 @@ +Qualcomm QUP SPI controller Device Tree Bindings +------------------------------------------- + +Required properties: +- compatible : Should be "qcom,spi-qup-v1.1.1", "qcom,spi-qup-v2.1.1" + or "qcom,spi-qup-v2.2.1" +- reg : Physical base address and size of SPI registers map. +- clock : Clock phandle (see clock bindings for details). +- #address-cells : Number of cells required to define a chip select + address on the SPI bus. Should be set to 1. +- #size-cells : Should be zero. +- pinctrl-names : Must be "default" +- pinctrl-n : At least one pinctrl phandle +- cs-gpios : Should specify GPIOs used for chipselects. + The gpios will be referred to as reg = <index> in the + SPI child nodes. + +Optional properties: +- num-cs : total number of chipselects + +Example: + + blsp1_spi1: spi@78b5000 { + compatible = "qcom,spi-qup-v2.2.1"; + reg = <0x78b5000 0x600>; + clock = <&gcc 23>; + #address-cells = <1>; + #size-cells = <0>; + pinctrl-names = "spi"; + pinctrl-0 = <&blsp_spi0>; + num-cs = <2>; + cs-gpios = <&soc_gpios 54 GPIO_ACTIVE_HIGH>, <&soc_gpios 4 GPIO_ACTIVE_HIGH>; + }; diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 5df97c80fa..f7a9852565 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -271,6 +271,16 @@ config PL022_SPI controller. If you have an embedded system with an AMBA(R) bus and a PL022 controller, say Y or M here. +config SPI_QUP + bool "Qualcomm SPI controller with QUP interface" + depends on ARCH_IPQ40XX + help + Qualcomm Universal Peripheral (QUP) core is an AHB slave that + provides a common data path (an output FIFO and an input FIFO) + for serial peripheral interface (SPI) mini-core. SPI in master + mode supports up to 50MHz, up to four chip selects, programmable + data path from 4 bits to 32 bits and numerous protocol variants. + config RENESAS_RPC_SPI bool "Renesas RPC SPI driver" depends on RCAR_GEN3 || RZA1 diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index b5c9ff1af8..d9b5bd9b79 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -47,6 +47,7 @@ obj-$(CONFIG_OCTEON_SPI) += octeon_spi.o obj-$(CONFIG_OMAP3_SPI) += omap3_spi.o obj-$(CONFIG_PIC32_SPI) += pic32_spi.o obj-$(CONFIG_PL022_SPI) += pl022_spi.o +obj-$(CONFIG_SPI_QUP) += spi-qup.o obj-$(CONFIG_RENESAS_RPC_SPI) += renesas_rpc_spi.o obj-$(CONFIG_ROCKCHIP_SPI) += rk_spi.o obj-$(CONFIG_SANDBOX_SPI) += sandbox_spi.o diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c new file mode 100644 index 0000000000..6f8df55fa5 --- /dev/null +++ b/drivers/spi/spi-qup.c @@ -0,0 +1,803 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Driver for Qualcomm QUP SPI controller + * FIFO and Block modes supported, no DMA + * mode support + * + * Copyright (c) 2020 Sartura Ltd. + * + * Author: Robert Marko <robert.marko@sartura.hr> + * Author: Luka Kovacic <luka.kovacic@sartura.hr> + * + * Based on stock U-boot and Linux drivers + */ + +#include <asm/gpio.h> +#include <asm/io.h> +#include <clk.h> +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <linux/delay.h> +#include <spi.h> + +#define QUP_CONFIG 0x0000 +#define QUP_STATE 0x0004 +#define QUP_IO_M_MODES 0x0008 +#define QUP_SW_RESET 0x000c +#define QUP_OPERATIONAL 0x0018 +#define QUP_ERROR_FLAGS 0x001c +#define QUP_ERROR_FLAGS_EN 0x0020 +#define QUP_OPERATIONAL_MASK 0x0028 +#define QUP_HW_VERSION 0x0030 +#define QUP_MX_OUTPUT_CNT 0x0100 +#define QUP_OUTPUT_FIFO 0x0110 +#define QUP_MX_WRITE_CNT 0x0150 +#define QUP_MX_INPUT_CNT 0x0200 +#define QUP_MX_READ_CNT 0x0208 +#define QUP_INPUT_FIFO 0x0218 + +#define SPI_CONFIG 0x0300 +#define SPI_IO_CONTROL 0x0304 +#define SPI_ERROR_FLAGS 0x0308 +#define SPI_ERROR_FLAGS_EN 0x030c + +/* QUP_CONFIG fields */ +#define QUP_CONFIG_SPI_MODE BIT(8) +#define QUP_CONFIG_CLOCK_AUTO_GATE BIT(13) +#define QUP_CONFIG_NO_INPUT BIT(7) +#define QUP_CONFIG_NO_OUTPUT BIT(6) +#define QUP_CONFIG_N 0x001f + +/* QUP_STATE fields */ +#define QUP_STATE_VALID BIT(2) +#define QUP_STATE_RESET 0 +#define QUP_STATE_RUN 1 +#define QUP_STATE_PAUSE 3 +#define QUP_STATE_MASK 3 +#define QUP_STATE_CLEAR 2 + +/* QUP_IO_M_MODES fields */ +#define QUP_IO_M_PACK_EN BIT(15) +#define QUP_IO_M_UNPACK_EN BIT(14) +#define QUP_IO_M_INPUT_MODE_MASK_SHIFT 12 +#define QUP_IO_M_OUTPUT_MODE_MASK_SHIFT 10 +#define QUP_IO_M_INPUT_MODE_MASK (3 << QUP_IO_M_INPUT_MODE_MASK_SHIFT) +#define QUP_IO_M_OUTPUT_MODE_MASK (3 << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT) + +#define QUP_IO_M_OUTPUT_BLOCK_SIZE(x) (((x) & (0x03 << 0)) >> 0) +#define QUP_IO_M_OUTPUT_FIFO_SIZE(x) (((x) & (0x07 << 2)) >> 2) +#define QUP_IO_M_INPUT_BLOCK_SIZE(x) (((x) & (0x03 << 5)) >> 5) +#define QUP_IO_M_INPUT_FIFO_SIZE(x) (((x) & (0x07 << 7)) >> 7) + +#define QUP_IO_M_MODE_FIFO 0 +#define QUP_IO_M_MODE_BLOCK 1 +#define QUP_IO_M_MODE_DMOV 2 +#define QUP_IO_M_MODE_BAM 3 + +/* QUP_OPERATIONAL fields */ +#define QUP_OP_IN_BLOCK_READ_REQ BIT(13) +#define QUP_OP_OUT_BLOCK_WRITE_REQ BIT(12) +#define QUP_OP_MAX_INPUT_DONE_FLAG BIT(11) +#define QUP_OP_MAX_OUTPUT_DONE_FLAG BIT(10) +#define QUP_OP_IN_SERVICE_FLAG BIT(9) +#define QUP_OP_OUT_SERVICE_FLAG BIT(8) +#define QUP_OP_IN_FIFO_FULL BIT(7) +#define QUP_OP_OUT_FIFO_FULL BIT(6) +#define QUP_OP_IN_FIFO_NOT_EMPTY BIT(5) +#define QUP_OP_OUT_FIFO_NOT_EMPTY BIT(4) + +/* QUP_ERROR_FLAGS and QUP_ERROR_FLAGS_EN fields */ +#define QUP_ERROR_OUTPUT_OVER_RUN BIT(5) +#define QUP_ERROR_INPUT_UNDER_RUN BIT(4) +#define QUP_ERROR_OUTPUT_UNDER_RUN BIT(3) +#define QUP_ERROR_INPUT_OVER_RUN BIT(2) + +/* SPI_CONFIG fields */ +#define SPI_CONFIG_HS_MODE BIT(10) +#define SPI_CONFIG_INPUT_FIRST BIT(9) +#define SPI_CONFIG_LOOPBACK BIT(8) + +/* SPI_IO_CONTROL fields */ +#define SPI_IO_C_FORCE_CS BIT(11) +#define SPI_IO_C_CLK_IDLE_HIGH BIT(10) +#define SPI_IO_C_MX_CS_MODE BIT(8) +#define SPI_IO_C_CS_N_POLARITY_0 BIT(4) +#define SPI_IO_C_CS_SELECT(x) (((x) & 3) << 2) +#define SPI_IO_C_CS_SELECT_MASK 0x000c +#define SPI_IO_C_TRISTATE_CS BIT(1) +#define SPI_IO_C_NO_TRI_STATE BIT(0) + +/* SPI_ERROR_FLAGS and SPI_ERROR_FLAGS_EN fields */ +#define SPI_ERROR_CLK_OVER_RUN BIT(1) +#define SPI_ERROR_CLK_UNDER_RUN BIT(0) + +#define SPI_NUM_CHIPSELECTS 4 + +#define SPI_DELAY_THRESHOLD 1 +#define SPI_DELAY_RETRY 10 + +#define SPI_RESET_STATE 0 +#define SPI_RUN_STATE 1 +#define SPI_CORE_RESET 0 +#define SPI_CORE_RUNNING 1 + +#define DUMMY_DATA_VAL 0 +#define TIMEOUT_CNT 100 + +#define QUP_STATE_VALID_BIT 2 +#define QUP_CONFIG_MINI_CORE_MSK (0x0F << 8) +#define QUP_CONFIG_MINI_CORE_SPI BIT(8) +#define QUP_CONF_INPUT_MSK BIT(7) +#define QUP_CONF_INPUT_ENA (0 << 7) +#define QUP_CONF_NO_INPUT BIT(7) +#define QUP_CONF_OUTPUT_MSK BIT(6) +#define QUP_CONF_OUTPUT_ENA (0 << 6) +#define QUP_CONF_NO_OUTPUT BIT(6) +#define QUP_STATE_RUN_STATE 0x1 +#define QUP_STATE_RESET_STATE 0x0 +#define QUP_STATE_PAUSE_STATE 0x3 +#define SPI_BIT_WORD_MSK 0x1F +#define SPI_8_BIT_WORD 0x07 +#define LOOP_BACK_MSK BIT(8) +#define NO_LOOP_BACK (0 << 8) +#define SLAVE_OPERATION_MSK BIT(5) +#define SLAVE_OPERATION (0 << 5) +#define CLK_ALWAYS_ON (0 << 9) +#define MX_CS_MODE BIT(8) +#define CS_POLARITY_MASK BIT(4) +#define NO_TRI_STATE BIT(0) +#define FORCE_CS_MSK BIT(11) +#define FORCE_CS_EN BIT(11) +#define FORCE_CS_DIS (0 << 11) +#define OUTPUT_BIT_SHIFT_MSK BIT(16) +#define OUTPUT_BIT_SHIFT_EN BIT(16) +#define INPUT_BLOCK_MODE_MSK (0x03 << 12) +#define INPUT_BLOCK_MODE (0x01 << 12) +#define OUTPUT_BLOCK_MODE_MSK (0x03 << 10) +#define OUTPUT_BLOCK_MODE (0x01 << 10) +#define INPUT_BAM_MODE (0x3 << 12) +#define OUTPUT_BAM_MODE (0x3 << 10) +#define PACK_EN (0x1 << 15) +#define UNPACK_EN (0x1 << 14) +#define PACK_EN_MSK (0x1 << 15) +#define UNPACK_EN_MSK (0x1 << 14) +#define OUTPUT_SERVICE_MSK (0x1 << 8) +#define INPUT_SERVICE_MSK (0x1 << 9) +#define OUTPUT_SERVICE_DIS (0x1 << 8) +#define INPUT_SERVICE_DIS (0x1 << 9) +#define BLSP0_SPI_DEASSERT_WAIT_REG 0x0310 +#define QUP_DATA_AVAILABLE_FOR_READ BIT(5) +#define SPI_INPUT_BLOCK_SIZE 4 +#define SPI_OUTPUT_BLOCK_SIZE 4 +#define SPI_BITLEN_MSK 0x07 +#define MAX_COUNT_SIZE 0xffff + +struct qup_spi_priv { + phys_addr_t base; + struct clk clk; + u32 num_cs; + struct gpio_desc cs_gpios[SPI_NUM_CHIPSELECTS]; + bool cs_high; + u32 core_state; +}; + +static int qup_spi_set_cs(struct udevice *dev, unsigned int cs, bool enable) +{ + struct qup_spi_priv *priv = dev_get_priv(dev); + + debug("%s: cs=%d enable=%d\n", __func__, cs, enable); + + if (cs >= SPI_NUM_CHIPSELECTS) + return -ENODEV; + + if (!dm_gpio_is_valid(&priv->cs_gpios[cs])) + return -EINVAL; + + if (priv->cs_high) + enable = !enable; + + return dm_gpio_set_value(&priv->cs_gpios[cs], enable ? 1 : 0); +} + +/* + * Function to write data to OUTPUT FIFO + */ +static void qup_spi_write_byte(struct udevice *dev, unsigned char data) +{ + struct udevice *bus = dev_get_parent(dev); + struct qup_spi_priv *priv = dev_get_priv(bus); + /* Wait for space in the FIFO */ + while ((readl(priv->base + QUP_OPERATIONAL) & QUP_OP_OUT_FIFO_FULL)) + udelay(1); + + /* Write the byte of data */ + writel(data, priv->base + QUP_OUTPUT_FIFO); +} + +/* + * Function to read data from Input FIFO + */ +static unsigned char qup_spi_read_byte(struct udevice *dev) +{ + struct udevice *bus = dev_get_parent(dev); + struct qup_spi_priv *priv = dev_get_priv(bus); + /* Wait for Data in FIFO */ + while (!(readl(priv->base + QUP_OPERATIONAL) & QUP_DATA_AVAILABLE_FOR_READ)) { + printf("Stuck at FIFO data wait\n"); + udelay(1); + } + + /* Read a byte of data */ + return readl(priv->base + QUP_INPUT_FIFO) & 0xff; +} + +/* + * Function to check wheather Input or Output FIFO + * has data to be serviced + */ +static int qup_spi_check_fifo_status(struct udevice *dev, u32 reg_addr) +{ + struct udevice *bus = dev_get_parent(dev); + struct qup_spi_priv *priv = dev_get_priv(bus); + unsigned int count = TIMEOUT_CNT; + unsigned int status_flag; + unsigned int val; + + do { + val = readl(priv->base + reg_addr); + count--; + if (count == 0) + return -ETIMEDOUT; + + status_flag = ((val & QUP_OP_OUT_SERVICE_FLAG) | (val & QUP_OP_IN_SERVICE_FLAG)); + } while (!status_flag); + + return 0; +} + +/* + * Function to configure Input and Output enable/disable + */ +static void qup_spi_enable_io_config(struct udevice *dev, u32 write_cnt, u32 read_cnt) +{ + struct udevice *bus = dev_get_parent(dev); + struct qup_spi_priv *priv = dev_get_priv(bus); + + if (write_cnt) { + clrsetbits_le32(priv->base + QUP_CONFIG, + QUP_CONF_OUTPUT_MSK, QUP_CONF_OUTPUT_ENA); + } else { + clrsetbits_le32(priv->base + QUP_CONFIG, + QUP_CONF_OUTPUT_MSK, QUP_CONF_NO_OUTPUT); + } + + if (read_cnt) { + clrsetbits_le32(priv->base + QUP_CONFIG, + QUP_CONF_INPUT_MSK, QUP_CONF_INPUT_ENA); + } else { + clrsetbits_le32(priv->base + QUP_CONFIG, + QUP_CONF_INPUT_MSK, QUP_CONF_NO_INPUT); + } +} + +static int check_bit_state(struct udevice *dev, u32 reg_addr, int bit_num, int val, + int us_delay) +{ + struct udevice *bus = dev_get_parent(dev); + struct qup_spi_priv *priv = dev_get_priv(bus); + unsigned int count = TIMEOUT_CNT; + unsigned int bit_val = ((readl(priv->base + reg_addr) >> bit_num) & 0x01); + + while (bit_val != val) { + count--; + if (count == 0) + return -ETIMEDOUT; + udelay(us_delay); + bit_val = ((readl(priv->base + reg_addr) >> bit_num) & 0x01); + } + + return 0; +} + +/* + * Check whether QUPn State is valid + */ +static int check_qup_state_valid(struct udevice *dev) +{ + return check_bit_state(dev, QUP_STATE, QUP_STATE_VALID, 1, 1); +} + +/* + * Configure QUPn Core state + */ +static int qup_spi_config_spi_state(struct udevice *dev, unsigned int state) +{ + struct udevice *bus = dev_get_parent(dev); + struct qup_spi_priv *priv = dev_get_priv(bus); + u32 val; + int ret; + + ret = check_qup_state_valid(dev); + if (ret != 0) + return ret; + + switch (state) { + case SPI_RUN_STATE: + /* Set the state to RUN */ + val = ((readl(priv->base + QUP_STATE) & ~QUP_STATE_MASK) + | QUP_STATE_RUN); + writel(val, priv->base + QUP_STATE); + ret = check_qup_state_valid(dev); + if (ret != 0) + return ret; + priv->core_state = SPI_CORE_RUNNING; + break; + case SPI_RESET_STATE: + /* Set the state to RESET */ + val = ((readl(priv->base + QUP_STATE) & ~QUP_STATE_MASK) + | QUP_STATE_RESET); + writel(val, priv->base + QUP_STATE); + ret = check_qup_state_valid(dev); + if (ret != 0) + return ret; + priv->core_state = SPI_CORE_RESET; + break; + default: + printf("Unsupported QUP SPI state: %d\n", state); + ret = -EINVAL; + break; + } + return ret; +} + +/* + * Function to read bytes number of data from the Input FIFO + */ +static int __qup_spi_blsp_spi_read(struct udevice *dev, u8 *data_buffer, unsigned int bytes) +{ + struct udevice *bus = dev_get_parent(dev); + struct qup_spi_priv *priv = dev_get_priv(bus); + u32 val; + unsigned int i; + unsigned int read_bytes = bytes; + unsigned int fifo_count; + int ret = 0; + int state_config; + + /* Configure no of bytes to read */ + state_config = qup_spi_config_spi_state(dev, SPI_RESET_STATE); + if (state_config) + return state_config; + + /* Configure input and output enable */ + qup_spi_enable_io_config(dev, 0, read_bytes); + + writel(bytes, priv->base + QUP_MX_INPUT_CNT); + + state_config = qup_spi_config_spi_state(dev, SPI_RUN_STATE); + if (state_config) + return state_config; + + while (read_bytes) { + ret = qup_spi_check_fifo_status(dev, QUP_OPERATIONAL); + if (ret != 0) + goto out; + + val = readl(priv->base + QUP_OPERATIONAL); + if (val & QUP_OP_IN_SERVICE_FLAG) { + /* + * acknowledge to hw that software will + * read input data + */ + val &= QUP_OP_IN_SERVICE_FLAG; + writel(val, priv->base + QUP_OPERATIONAL); + + fifo_count = ((read_bytes > SPI_INPUT_BLOCK_SIZE) ? + SPI_INPUT_BLOCK_SIZE : read_bytes); + + for (i = 0; i < fifo_count; i++) { + *data_buffer = qup_spi_read_byte(dev); + data_buffer++; + read_bytes--; + } + } + } + +out: + /* + * Put the SPI Core back in the Reset State + * to end the transfer + */ + (void)qup_spi_config_spi_state(dev, SPI_RESET_STATE); + + return ret; +} + +static int qup_spi_blsp_spi_read(struct udevice *dev, u8 *data_buffer, unsigned int bytes) +{ + int length, ret; + + while (bytes) { + length = (bytes < MAX_COUNT_SIZE) ? bytes : MAX_COUNT_SIZE; + + ret = __qup_spi_blsp_spi_read(dev, data_buffer, length); + if (ret != 0) + return ret; + + data_buffer += length; + bytes -= length; + } + + return 0; +} + +/* + * Function to write data to the Output FIFO + */ +static int __qup_blsp_spi_write(struct udevice *dev, const u8 *cmd_buffer, unsigned int bytes) +{ + struct udevice *bus = dev_get_parent(dev); + struct qup_spi_priv *priv = dev_get_priv(bus); + u32 val; + unsigned int i; + unsigned int write_len = bytes; + unsigned int read_len = bytes; + unsigned int fifo_count; + int ret = 0; + int state_config; + + state_config = qup_spi_config_spi_state(dev, SPI_RESET_STATE); + if (state_config) + return state_config; + + writel(bytes, priv->base + QUP_MX_OUTPUT_CNT); + writel(bytes, priv->base + QUP_MX_INPUT_CNT); + state_config = qup_spi_config_spi_state(dev, SPI_RUN_STATE); + if (state_config) + return state_config; + + /* Configure input and output enable */ + qup_spi_enable_io_config(dev, write_len, read_len); + + /* + * read_len considered to ensure that we read the dummy data for the + * write we performed. This is needed to ensure with WR-RD transaction + * to get the actual data on the subsequent read cycle that happens + */ + while (write_len || read_len) { + ret = qup_spi_check_fifo_status(dev, QUP_OPERATIONAL); + if (ret != 0) + goto out; + + val = readl(priv->base + QUP_OPERATIONAL); + if (val & QUP_OP_OUT_SERVICE_FLAG) { + /* + * acknowledge to hw that software will write + * expected output data + */ + val &= QUP_OP_OUT_SERVICE_FLAG; + writel(val, priv->base + QUP_OPERATIONAL); + + if (write_len > SPI_OUTPUT_BLOCK_SIZE) + fifo_count = SPI_OUTPUT_BLOCK_SIZE; + else + fifo_count = write_len; + + for (i = 0; i < fifo_count; i++) { + /* Write actual data to output FIFO */ + qup_spi_write_byte(dev, *cmd_buffer); + cmd_buffer++; + write_len--; + } + } + if (val & QUP_OP_IN_SERVICE_FLAG) { + /* + * acknowledge to hw that software + * will read input data + */ + val &= QUP_OP_IN_SERVICE_FLAG; + writel(val, priv->base + QUP_OPERATIONAL); + + if (read_len > SPI_INPUT_BLOCK_SIZE) + fifo_count = SPI_INPUT_BLOCK_SIZE; + else + fifo_count = read_len; + + for (i = 0; i < fifo_count; i++) { + /* Read dummy data for the data written */ + (void)qup_spi_read_byte(dev); + + /* Decrement the write count after reading the + * dummy data from the device. This is to make + * sure we read dummy data before we write the + * data to fifo + */ + read_len--; + } + } + } +out: + /* + * Put the SPI Core back in the Reset State + * to end the transfer + */ + (void)qup_spi_config_spi_state(dev, SPI_RESET_STATE); + + return ret; +} + +static int qup_spi_blsp_spi_write(struct udevice *dev, const u8 *cmd_buffer, unsigned int bytes) +{ + int length, ret; + + while (bytes) { + length = (bytes < MAX_COUNT_SIZE) ? bytes : MAX_COUNT_SIZE; + + ret = __qup_blsp_spi_write(dev, cmd_buffer, length); + if (ret != 0) + return ret; + + cmd_buffer += length; + bytes -= length; + } + + return 0; +} + +static int qup_spi_set_speed(struct udevice *dev, uint speed) +{ + return 0; +} + +static int qup_spi_set_mode(struct udevice *dev, uint mode) +{ + struct qup_spi_priv *priv = dev_get_priv(dev); + unsigned int clk_idle_state; + unsigned int input_first_mode; + u32 val; + + switch (mode) { + case SPI_MODE_0: + clk_idle_state = 0; + input_first_mode = SPI_CONFIG_INPUT_FIRST; + break; + case SPI_MODE_1: + clk_idle_state = 0; + input_first_mode = 0; + break; + case SPI_MODE_2: + clk_idle_state = 1; + input_first_mode = SPI_CONFIG_INPUT_FIRST; + break; + case SPI_MODE_3: + clk_idle_state = 1; + input_first_mode = 0; + break; + default: + printf("Unsupported spi mode: %d\n", mode); + return -EINVAL; + } + + if (mode & SPI_CS_HIGH) + priv->cs_high = true; + else + priv->cs_high = false; + + val = readl(priv->base + SPI_CONFIG); + val |= input_first_mode; + writel(val, priv->base + SPI_CONFIG); + + val = readl(priv->base + SPI_IO_CONTROL); + if (clk_idle_state) + val |= SPI_IO_C_CLK_IDLE_HIGH; + else + val &= ~SPI_IO_C_CLK_IDLE_HIGH; + + writel(val, priv->base + SPI_IO_CONTROL); + + return 0; +} + +static void qup_spi_reset(struct udevice *dev) +{ + struct udevice *bus = dev_get_parent(dev); + struct qup_spi_priv *priv = dev_get_priv(bus); + + /* Driver may not be probed yet */ + if (!priv) + return; + + writel(0x1, priv->base + QUP_SW_RESET); + udelay(5); +} + +static int qup_spi_hw_init(struct udevice *dev) +{ + struct udevice *bus = dev_get_parent(dev); + struct qup_spi_priv *priv = dev_get_priv(bus); + int ret; + + /* QUPn module configuration */ + qup_spi_reset(dev); + + /* Set the QUPn state */ + ret = qup_spi_config_spi_state(dev, SPI_RESET_STATE); + if (ret) + return ret; + + /* + * Configure Mini core to SPI core with Input Output enabled, + * SPI master, N = 8 bits + */ + clrsetbits_le32(priv->base + QUP_CONFIG, (QUP_CONFIG_MINI_CORE_MSK | + QUP_CONF_INPUT_MSK | + QUP_CONF_OUTPUT_MSK | + SPI_BIT_WORD_MSK), + (QUP_CONFIG_MINI_CORE_SPI | + QUP_CONF_INPUT_ENA | + QUP_CONF_OUTPUT_ENA | + SPI_8_BIT_WORD)); + + /* + * Configure Input first SPI protocol, + * SPI master mode and no loopback + */ + clrsetbits_le32(priv->base + SPI_CONFIG, (LOOP_BACK_MSK | + SLAVE_OPERATION_MSK), + (NO_LOOP_BACK | + SLAVE_OPERATION)); + + /* + * Configure SPI IO Control Register + * CLK_ALWAYS_ON = 0 + * MX_CS_MODE = 0 + * NO_TRI_STATE = 1 + */ + writel((CLK_ALWAYS_ON | NO_TRI_STATE), priv->base + SPI_IO_CONTROL); + + /* + * Configure SPI IO Modes. + * OUTPUT_BIT_SHIFT_EN = 1 + * INPUT_MODE = Block Mode + * OUTPUT MODE = Block Mode + */ + + clrsetbits_le32(priv->base + QUP_IO_M_MODES, (OUTPUT_BIT_SHIFT_MSK | + INPUT_BLOCK_MODE_MSK | + OUTPUT_BLOCK_MODE_MSK), + (OUTPUT_BIT_SHIFT_EN | + INPUT_BLOCK_MODE | + OUTPUT_BLOCK_MODE)); + + /* Disable Error mask */ + writel(0, priv->base + SPI_ERROR_FLAGS_EN); + writel(0, priv->base + QUP_ERROR_FLAGS_EN); + writel(0, priv->base + BLSP0_SPI_DEASSERT_WAIT_REG); + + return ret; +} + +static int qup_spi_claim_bus(struct udevice *dev) +{ + int ret; + + ret = qup_spi_hw_init(dev); + if (ret) + return -EIO; + + return 0; +} + +static int qup_spi_release_bus(struct udevice *dev) +{ + /* Reset the SPI hardware */ + qup_spi_reset(dev); + + return 0; +} + +static int qup_spi_xfer(struct udevice *dev, unsigned int bitlen, + const void *dout, void *din, unsigned long flags) +{ + struct udevice *bus = dev_get_parent(dev); + struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev); + unsigned int len; + const u8 *txp = dout; + u8 *rxp = din; + int ret = 0; + + if (bitlen & SPI_BITLEN_MSK) { + printf("Invalid bit length\n"); + return -EINVAL; + } + + len = bitlen >> 3; + + if (flags & SPI_XFER_BEGIN) { + ret = qup_spi_hw_init(dev); + if (ret != 0) + return ret; + + ret = qup_spi_set_cs(bus, slave_plat->cs, false); + if (ret != 0) + return ret; + } + + if (dout != NULL) { + ret = qup_spi_blsp_spi_write(dev, txp, len); + if (ret != 0) + return ret; + } + + if (din != NULL) { + ret = qup_spi_blsp_spi_read(dev, rxp, len); + if (ret != 0) + return ret; + } + + if (flags & SPI_XFER_END) { + ret = qup_spi_set_cs(bus, slave_plat->cs, true); + if (ret != 0) + return ret; + } + + return ret; +} + +static int qup_spi_probe(struct udevice *dev) +{ + struct qup_spi_priv *priv = dev_get_priv(dev); + int ret; + + priv->base = dev_read_addr(dev); + if (priv->base == FDT_ADDR_T_NONE) + return -EINVAL; + + ret = clk_get_by_index(dev, 0, &priv->clk); + if (ret) + return ret; + + ret = clk_enable(&priv->clk); + if (ret < 0) + return ret; + + priv->num_cs = dev_read_u32_default(dev, "num-cs", 1); + + ret = gpio_request_list_by_name(dev, "cs-gpios", priv->cs_gpios, + priv->num_cs, GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE); + if (ret < 0) { + printf("Can't get %s cs gpios: %d\n", dev->name, ret); + return -EINVAL; + } + + return 0; +} + +static const struct dm_spi_ops qup_spi_ops = { + .claim_bus = qup_spi_claim_bus, + .release_bus = qup_spi_release_bus, + .xfer = qup_spi_xfer, + .set_speed = qup_spi_set_speed, + .set_mode = qup_spi_set_mode, + /* + * cs_info is not needed, since we require all chip selects to be + * in the device tree explicitly + */ +}; + +static const struct udevice_id qup_spi_ids[] = { + { .compatible = "qcom,spi-qup-v1.1.1", }, + { .compatible = "qcom,spi-qup-v2.1.1", }, + { .compatible = "qcom,spi-qup-v2.2.1", }, + { } +}; + +U_BOOT_DRIVER(spi_qup) = { + .name = "spi_qup", + .id = UCLASS_SPI, + .of_match = qup_spi_ids, + .ops = &qup_spi_ops, + .priv_auto_alloc_size = sizeof(struct qup_spi_priv), + .probe = qup_spi_probe, +}; |