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spi: sprd: Add SPI driver for Spreadtrum SC9860
This patch adds the SPI controller driver for Spreadtrum SC9860 platform. Signed-off-by: Lanqing Liu <lanqing.liu@spreadtrum.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lanqing Liu
Mark Brown
parent
862cf93e4b
commit
e7d973a31c
3 changed files with 752 additions and 0 deletions
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@ -596,6 +596,12 @@ config SPI_SIRF
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help
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SPI driver for CSR SiRFprimaII SoCs
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config SPI_SPRD
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tristate "Spreadtrum SPI controller"
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depends on ARCH_SPRD || COMPILE_TEST
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help
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SPI driver for Spreadtrum SoCs.
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config SPI_SPRD_ADI
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tristate "Spreadtrum ADI controller"
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depends on ARCH_SPRD || COMPILE_TEST
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@ -88,6 +88,7 @@ obj-$(CONFIG_SPI_SH_HSPI) += spi-sh-hspi.o
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obj-$(CONFIG_SPI_SH_MSIOF) += spi-sh-msiof.o
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obj-$(CONFIG_SPI_SH_SCI) += spi-sh-sci.o
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obj-$(CONFIG_SPI_SIRF) += spi-sirf.o
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obj-$(CONFIG_SPI_SPRD) += spi-sprd.o
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obj-$(CONFIG_SPI_SPRD_ADI) += spi-sprd-adi.o
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obj-$(CONFIG_SPI_STM32) += spi-stm32.o
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obj-$(CONFIG_SPI_ST_SSC4) += spi-st-ssc4.o
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745
drivers/spi/spi-sprd.c
Normal file
745
drivers/spi/spi-sprd.c
Normal file
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@ -0,0 +1,745 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Spreadtrum Communications Inc.
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#include <linux/clk.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/spi/spi.h>
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#define SPRD_SPI_TXD 0x0
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#define SPRD_SPI_CLKD 0x4
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#define SPRD_SPI_CTL0 0x8
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#define SPRD_SPI_CTL1 0xc
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#define SPRD_SPI_CTL2 0x10
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#define SPRD_SPI_CTL3 0x14
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#define SPRD_SPI_CTL4 0x18
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#define SPRD_SPI_CTL5 0x1c
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#define SPRD_SPI_INT_EN 0x20
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#define SPRD_SPI_INT_CLR 0x24
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#define SPRD_SPI_INT_RAW_STS 0x28
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#define SPRD_SPI_INT_MASK_STS 0x2c
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#define SPRD_SPI_STS1 0x30
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#define SPRD_SPI_STS2 0x34
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#define SPRD_SPI_DSP_WAIT 0x38
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#define SPRD_SPI_STS3 0x3c
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#define SPRD_SPI_CTL6 0x40
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#define SPRD_SPI_STS4 0x44
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#define SPRD_SPI_FIFO_RST 0x48
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#define SPRD_SPI_CTL7 0x4c
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#define SPRD_SPI_STS5 0x50
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#define SPRD_SPI_CTL8 0x54
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#define SPRD_SPI_CTL9 0x58
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#define SPRD_SPI_CTL10 0x5c
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#define SPRD_SPI_CTL11 0x60
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#define SPRD_SPI_CTL12 0x64
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#define SPRD_SPI_STS6 0x68
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#define SPRD_SPI_STS7 0x6c
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#define SPRD_SPI_STS8 0x70
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#define SPRD_SPI_STS9 0x74
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/* Bits & mask definition for register CTL0 */
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#define SPRD_SPI_SCK_REV BIT(13)
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#define SPRD_SPI_NG_TX BIT(1)
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#define SPRD_SPI_NG_RX BIT(0)
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#define SPRD_SPI_CHNL_LEN_MASK GENMASK(4, 0)
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#define SPRD_SPI_CSN_MASK GENMASK(11, 8)
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#define SPRD_SPI_CS0_VALID BIT(8)
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/* Bits & mask definition for register SPI_INT_EN */
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#define SPRD_SPI_TX_END_INT_EN BIT(8)
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#define SPRD_SPI_RX_END_INT_EN BIT(9)
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/* Bits & mask definition for register SPI_INT_RAW_STS */
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#define SPRD_SPI_TX_END_RAW BIT(8)
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#define SPRD_SPI_RX_END_RAW BIT(9)
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/* Bits & mask definition for register SPI_INT_CLR */
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#define SPRD_SPI_TX_END_CLR BIT(8)
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#define SPRD_SPI_RX_END_CLR BIT(9)
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/* Bits & mask definition for register INT_MASK_STS */
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#define SPRD_SPI_MASK_RX_END BIT(9)
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#define SPRD_SPI_MASK_TX_END BIT(8)
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/* Bits & mask definition for register STS2 */
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#define SPRD_SPI_TX_BUSY BIT(8)
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/* Bits & mask definition for register CTL1 */
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#define SPRD_SPI_RX_MODE BIT(12)
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#define SPRD_SPI_TX_MODE BIT(13)
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#define SPRD_SPI_RTX_MD_MASK GENMASK(13, 12)
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/* Bits & mask definition for register CTL2 */
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#define SPRD_SPI_DMA_EN BIT(6)
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/* Bits & mask definition for register CTL4 */
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#define SPRD_SPI_START_RX BIT(9)
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#define SPRD_SPI_ONLY_RECV_MASK GENMASK(8, 0)
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/* Bits & mask definition for register SPI_INT_CLR */
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#define SPRD_SPI_RX_END_INT_CLR BIT(9)
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#define SPRD_SPI_TX_END_INT_CLR BIT(8)
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/* Bits & mask definition for register SPI_INT_RAW */
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#define SPRD_SPI_RX_END_IRQ BIT(9)
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#define SPRD_SPI_TX_END_IRQ BIT(8)
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/* Bits & mask definition for register CTL12 */
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#define SPRD_SPI_SW_RX_REQ BIT(0)
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#define SPRD_SPI_SW_TX_REQ BIT(1)
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/* Bits & mask definition for register CTL7 */
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#define SPRD_SPI_DATA_LINE2_EN BIT(15)
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#define SPRD_SPI_MODE_MASK GENMASK(5, 3)
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#define SPRD_SPI_MODE_OFFSET 3
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#define SPRD_SPI_3WIRE_MODE 4
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#define SPRD_SPI_4WIRE_MODE 0
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/* Bits & mask definition for register CTL8 */
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#define SPRD_SPI_TX_MAX_LEN_MASK GENMASK(19, 0)
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#define SPRD_SPI_TX_LEN_H_MASK GENMASK(3, 0)
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#define SPRD_SPI_TX_LEN_H_OFFSET 16
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/* Bits & mask definition for register CTL9 */
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#define SPRD_SPI_TX_LEN_L_MASK GENMASK(15, 0)
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/* Bits & mask definition for register CTL10 */
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#define SPRD_SPI_RX_MAX_LEN_MASK GENMASK(19, 0)
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#define SPRD_SPI_RX_LEN_H_MASK GENMASK(3, 0)
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#define SPRD_SPI_RX_LEN_H_OFFSET 16
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/* Bits & mask definition for register CTL11 */
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#define SPRD_SPI_RX_LEN_L_MASK GENMASK(15, 0)
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/* Default & maximum word delay cycles */
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#define SPRD_SPI_MIN_DELAY_CYCLE 14
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#define SPRD_SPI_MAX_DELAY_CYCLE 130
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#define SPRD_SPI_FIFO_SIZE 32
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#define SPRD_SPI_CHIP_CS_NUM 0x4
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#define SPRD_SPI_CHNL_LEN 2
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#define SPRD_SPI_DEFAULT_SOURCE 26000000
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#define SPRD_SPI_MAX_SPEED_HZ 48000000
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#define SPRD_SPI_AUTOSUSPEND_DELAY 100
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struct sprd_spi {
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void __iomem *base;
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struct device *dev;
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struct clk *clk;
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u32 src_clk;
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u32 hw_mode;
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u32 trans_len;
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u32 trans_mode;
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u32 word_delay;
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u32 hw_speed_hz;
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u32 len;
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int status;
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const void *tx_buf;
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void *rx_buf;
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int (*read_bufs)(struct sprd_spi *ss, u32 len);
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int (*write_bufs)(struct sprd_spi *ss, u32 len);
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};
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static u32 sprd_spi_transfer_max_timeout(struct sprd_spi *ss,
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struct spi_transfer *t)
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{
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/*
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* The time spent on transmission of the full FIFO data is the maximum
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* SPI transmission time.
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*/
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u32 size = t->bits_per_word * SPRD_SPI_FIFO_SIZE;
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u32 bit_time_us = DIV_ROUND_UP(USEC_PER_SEC, ss->hw_speed_hz);
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u32 total_time_us = size * bit_time_us;
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/*
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* There is an interval between data and the data in our SPI hardware,
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* so the total transmission time need add the interval time.
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*/
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u32 interval_cycle = SPRD_SPI_FIFO_SIZE * ss->word_delay;
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u32 interval_time_us = DIV_ROUND_UP(interval_cycle * USEC_PER_SEC,
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ss->src_clk);
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return total_time_us + interval_time_us;
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}
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static int sprd_spi_wait_for_tx_end(struct sprd_spi *ss, struct spi_transfer *t)
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{
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u32 val, us;
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int ret;
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us = sprd_spi_transfer_max_timeout(ss, t);
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ret = readl_relaxed_poll_timeout(ss->base + SPRD_SPI_INT_RAW_STS, val,
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val & SPRD_SPI_TX_END_IRQ, 0, us);
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if (ret) {
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dev_err(ss->dev, "SPI error, spi send timeout!\n");
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return ret;
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}
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ret = readl_relaxed_poll_timeout(ss->base + SPRD_SPI_STS2, val,
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!(val & SPRD_SPI_TX_BUSY), 0, us);
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if (ret) {
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dev_err(ss->dev, "SPI error, spi busy timeout!\n");
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return ret;
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}
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writel_relaxed(SPRD_SPI_TX_END_INT_CLR, ss->base + SPRD_SPI_INT_CLR);
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return 0;
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}
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static int sprd_spi_wait_for_rx_end(struct sprd_spi *ss, struct spi_transfer *t)
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{
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u32 val, us;
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int ret;
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us = sprd_spi_transfer_max_timeout(ss, t);
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ret = readl_relaxed_poll_timeout(ss->base + SPRD_SPI_INT_RAW_STS, val,
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val & SPRD_SPI_RX_END_IRQ, 0, us);
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if (ret) {
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dev_err(ss->dev, "SPI error, spi rx timeout!\n");
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return ret;
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}
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writel_relaxed(SPRD_SPI_RX_END_INT_CLR, ss->base + SPRD_SPI_INT_CLR);
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return 0;
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}
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static void sprd_spi_tx_req(struct sprd_spi *ss)
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{
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writel_relaxed(SPRD_SPI_SW_TX_REQ, ss->base + SPRD_SPI_CTL12);
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}
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static void sprd_spi_rx_req(struct sprd_spi *ss)
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{
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writel_relaxed(SPRD_SPI_SW_RX_REQ, ss->base + SPRD_SPI_CTL12);
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}
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static void sprd_spi_enter_idle(struct sprd_spi *ss)
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{
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u32 val = readl_relaxed(ss->base + SPRD_SPI_CTL1);
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val &= ~SPRD_SPI_RTX_MD_MASK;
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writel_relaxed(val, ss->base + SPRD_SPI_CTL1);
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}
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static void sprd_spi_set_transfer_bits(struct sprd_spi *ss, u32 bits)
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{
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u32 val = readl_relaxed(ss->base + SPRD_SPI_CTL0);
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/* Set the valid bits for every transaction */
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val &= ~(SPRD_SPI_CHNL_LEN_MASK << SPRD_SPI_CHNL_LEN);
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val |= bits << SPRD_SPI_CHNL_LEN;
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writel_relaxed(val, ss->base + SPRD_SPI_CTL0);
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}
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static void sprd_spi_set_tx_length(struct sprd_spi *ss, u32 length)
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{
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u32 val = readl_relaxed(ss->base + SPRD_SPI_CTL8);
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length &= SPRD_SPI_TX_MAX_LEN_MASK;
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val &= ~SPRD_SPI_TX_LEN_H_MASK;
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val |= length >> SPRD_SPI_TX_LEN_H_OFFSET;
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writel_relaxed(val, ss->base + SPRD_SPI_CTL8);
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val = length & SPRD_SPI_TX_LEN_L_MASK;
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writel_relaxed(val, ss->base + SPRD_SPI_CTL9);
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}
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static void sprd_spi_set_rx_length(struct sprd_spi *ss, u32 length)
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{
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u32 val = readl_relaxed(ss->base + SPRD_SPI_CTL10);
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length &= SPRD_SPI_RX_MAX_LEN_MASK;
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val &= ~SPRD_SPI_RX_LEN_H_MASK;
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val |= length >> SPRD_SPI_RX_LEN_H_OFFSET;
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writel_relaxed(val, ss->base + SPRD_SPI_CTL10);
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val = length & SPRD_SPI_RX_LEN_L_MASK;
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writel_relaxed(val, ss->base + SPRD_SPI_CTL11);
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}
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static void sprd_spi_chipselect(struct spi_device *sdev, bool cs)
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{
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struct spi_controller *sctlr = sdev->controller;
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struct sprd_spi *ss = spi_controller_get_devdata(sctlr);
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u32 val;
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val = readl_relaxed(ss->base + SPRD_SPI_CTL0);
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/* The SPI controller will pull down CS pin if cs is 0 */
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if (!cs) {
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val &= ~SPRD_SPI_CS0_VALID;
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writel_relaxed(val, ss->base + SPRD_SPI_CTL0);
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} else {
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val |= SPRD_SPI_CSN_MASK;
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writel_relaxed(val, ss->base + SPRD_SPI_CTL0);
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}
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}
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static int sprd_spi_write_only_receive(struct sprd_spi *ss, u32 len)
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{
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u32 val;
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/* Clear the start receive bit and reset receive data number */
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val = readl_relaxed(ss->base + SPRD_SPI_CTL4);
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val &= ~(SPRD_SPI_START_RX | SPRD_SPI_ONLY_RECV_MASK);
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writel_relaxed(val, ss->base + SPRD_SPI_CTL4);
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/* Set the receive data length */
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val = readl_relaxed(ss->base + SPRD_SPI_CTL4);
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val |= len & SPRD_SPI_ONLY_RECV_MASK;
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writel_relaxed(val, ss->base + SPRD_SPI_CTL4);
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/* Trigger to receive data */
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val = readl_relaxed(ss->base + SPRD_SPI_CTL4);
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val |= SPRD_SPI_START_RX;
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writel_relaxed(val, ss->base + SPRD_SPI_CTL4);
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return len;
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}
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static int sprd_spi_write_bufs_u8(struct sprd_spi *ss, u32 len)
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{
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u8 *tx_p = (u8 *)ss->tx_buf;
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int i;
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for (i = 0; i < len; i++)
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writeb_relaxed(tx_p[i], ss->base + SPRD_SPI_TXD);
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ss->tx_buf += i;
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return i;
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}
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static int sprd_spi_write_bufs_u16(struct sprd_spi *ss, u32 len)
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{
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u16 *tx_p = (u16 *)ss->tx_buf;
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int i;
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for (i = 0; i < len; i++)
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writew_relaxed(tx_p[i], ss->base + SPRD_SPI_TXD);
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ss->tx_buf += i << 1;
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return i << 1;
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}
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static int sprd_spi_write_bufs_u32(struct sprd_spi *ss, u32 len)
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{
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u32 *tx_p = (u32 *)ss->tx_buf;
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int i;
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for (i = 0; i < len; i++)
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writel_relaxed(tx_p[i], ss->base + SPRD_SPI_TXD);
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ss->tx_buf += i << 2;
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return i << 2;
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}
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static int sprd_spi_read_bufs_u8(struct sprd_spi *ss, u32 len)
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{
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u8 *rx_p = (u8 *)ss->rx_buf;
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int i;
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for (i = 0; i < len; i++)
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rx_p[i] = readb_relaxed(ss->base + SPRD_SPI_TXD);
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ss->rx_buf += i;
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return i;
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}
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static int sprd_spi_read_bufs_u16(struct sprd_spi *ss, u32 len)
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{
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u16 *rx_p = (u16 *)ss->rx_buf;
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int i;
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for (i = 0; i < len; i++)
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rx_p[i] = readw_relaxed(ss->base + SPRD_SPI_TXD);
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ss->rx_buf += i << 1;
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return i << 1;
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}
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static int sprd_spi_read_bufs_u32(struct sprd_spi *ss, u32 len)
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{
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u32 *rx_p = (u32 *)ss->rx_buf;
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int i;
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for (i = 0; i < len; i++)
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rx_p[i] = readl_relaxed(ss->base + SPRD_SPI_TXD);
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ss->rx_buf += i << 2;
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return i << 2;
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}
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static int sprd_spi_txrx_bufs(struct spi_device *sdev, struct spi_transfer *t)
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{
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struct sprd_spi *ss = spi_controller_get_devdata(sdev->controller);
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u32 trans_len = ss->trans_len, len;
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int ret, write_size = 0;
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while (trans_len) {
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len = trans_len > SPRD_SPI_FIFO_SIZE ? SPRD_SPI_FIFO_SIZE :
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trans_len;
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if (ss->trans_mode & SPRD_SPI_TX_MODE) {
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sprd_spi_set_tx_length(ss, len);
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write_size += ss->write_bufs(ss, len);
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||||
/*
|
||||
* For our 3 wires mode or dual TX line mode, we need
|
||||
* to request the controller to transfer.
|
||||
*/
|
||||
if (ss->hw_mode & SPI_3WIRE || ss->hw_mode & SPI_TX_DUAL)
|
||||
sprd_spi_tx_req(ss);
|
||||
|
||||
ret = sprd_spi_wait_for_tx_end(ss, t);
|
||||
} else {
|
||||
sprd_spi_set_rx_length(ss, len);
|
||||
|
||||
/*
|
||||
* For our 3 wires mode or dual TX line mode, we need
|
||||
* to request the controller to read.
|
||||
*/
|
||||
if (ss->hw_mode & SPI_3WIRE || ss->hw_mode & SPI_TX_DUAL)
|
||||
sprd_spi_rx_req(ss);
|
||||
else
|
||||
write_size += ss->write_bufs(ss, len);
|
||||
|
||||
ret = sprd_spi_wait_for_rx_end(ss, t);
|
||||
}
|
||||
|
||||
if (ret)
|
||||
goto complete;
|
||||
|
||||
if (ss->trans_mode & SPRD_SPI_RX_MODE)
|
||||
ss->read_bufs(ss, len);
|
||||
|
||||
trans_len -= len;
|
||||
}
|
||||
|
||||
ret = write_size;
|
||||
|
||||
complete:
|
||||
sprd_spi_enter_idle(ss);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void sprd_spi_set_speed(struct sprd_spi *ss, u32 speed_hz)
|
||||
{
|
||||
/*
|
||||
* From SPI datasheet, the prescale calculation formula:
|
||||
* prescale = SPI source clock / (2 * SPI_freq) - 1;
|
||||
*/
|
||||
u32 clk_div = DIV_ROUND_UP(ss->src_clk, speed_hz << 1) - 1;
|
||||
|
||||
/* Save the real hardware speed */
|
||||
ss->hw_speed_hz = (ss->src_clk >> 1) / (clk_div + 1);
|
||||
writel_relaxed(clk_div, ss->base + SPRD_SPI_CLKD);
|
||||
}
|
||||
|
||||
static void sprd_spi_init_hw(struct sprd_spi *ss, struct spi_transfer *t)
|
||||
{
|
||||
u16 word_delay, interval;
|
||||
u32 val;
|
||||
|
||||
val = readl_relaxed(ss->base + SPRD_SPI_CTL7);
|
||||
val &= ~(SPRD_SPI_SCK_REV | SPRD_SPI_NG_TX | SPRD_SPI_NG_RX);
|
||||
/* Set default chip selection, clock phase and clock polarity */
|
||||
val |= ss->hw_mode & SPI_CPHA ? SPRD_SPI_NG_RX : SPRD_SPI_NG_TX;
|
||||
val |= ss->hw_mode & SPI_CPOL ? SPRD_SPI_SCK_REV : 0;
|
||||
writel_relaxed(val, ss->base + SPRD_SPI_CTL0);
|
||||
|
||||
/*
|
||||
* Set the intervals of two SPI frames, and the inteval calculation
|
||||
* formula as below per datasheet:
|
||||
* interval time (source clock cycles) = interval * 4 + 10.
|
||||
*/
|
||||
word_delay = clamp_t(u16, t->word_delay, SPRD_SPI_MIN_DELAY_CYCLE,
|
||||
SPRD_SPI_MAX_DELAY_CYCLE);
|
||||
interval = DIV_ROUND_UP(word_delay - 10, 4);
|
||||
ss->word_delay = interval * 4 + 10;
|
||||
writel_relaxed(interval, ss->base + SPRD_SPI_CTL5);
|
||||
|
||||
/* Reset SPI fifo */
|
||||
writel_relaxed(1, ss->base + SPRD_SPI_FIFO_RST);
|
||||
writel_relaxed(0, ss->base + SPRD_SPI_FIFO_RST);
|
||||
|
||||
/* Set SPI work mode */
|
||||
val = readl_relaxed(ss->base + SPRD_SPI_CTL7);
|
||||
val &= ~SPRD_SPI_MODE_MASK;
|
||||
|
||||
if (ss->hw_mode & SPI_3WIRE)
|
||||
val |= SPRD_SPI_3WIRE_MODE << SPRD_SPI_MODE_OFFSET;
|
||||
else
|
||||
val |= SPRD_SPI_4WIRE_MODE << SPRD_SPI_MODE_OFFSET;
|
||||
|
||||
if (ss->hw_mode & SPI_TX_DUAL)
|
||||
val |= SPRD_SPI_DATA_LINE2_EN;
|
||||
else
|
||||
val &= ~SPRD_SPI_DATA_LINE2_EN;
|
||||
|
||||
writel_relaxed(val, ss->base + SPRD_SPI_CTL7);
|
||||
}
|
||||
|
||||
static int sprd_spi_setup_transfer(struct spi_device *sdev,
|
||||
struct spi_transfer *t)
|
||||
{
|
||||
struct sprd_spi *ss = spi_controller_get_devdata(sdev->controller);
|
||||
u8 bits_per_word = t->bits_per_word;
|
||||
u32 val, mode = 0;
|
||||
|
||||
ss->len = t->len;
|
||||
ss->tx_buf = t->tx_buf;
|
||||
ss->rx_buf = t->rx_buf;
|
||||
|
||||
ss->hw_mode = sdev->mode;
|
||||
sprd_spi_init_hw(ss, t);
|
||||
|
||||
/* Set tansfer speed and valid bits */
|
||||
sprd_spi_set_speed(ss, t->speed_hz);
|
||||
sprd_spi_set_transfer_bits(ss, bits_per_word);
|
||||
|
||||
if (bits_per_word > 16)
|
||||
bits_per_word = round_up(bits_per_word, 16);
|
||||
else
|
||||
bits_per_word = round_up(bits_per_word, 8);
|
||||
|
||||
switch (bits_per_word) {
|
||||
case 8:
|
||||
ss->trans_len = t->len;
|
||||
ss->read_bufs = sprd_spi_read_bufs_u8;
|
||||
ss->write_bufs = sprd_spi_write_bufs_u8;
|
||||
break;
|
||||
case 16:
|
||||
ss->trans_len = t->len >> 1;
|
||||
ss->read_bufs = sprd_spi_read_bufs_u16;
|
||||
ss->write_bufs = sprd_spi_write_bufs_u16;
|
||||
break;
|
||||
case 32:
|
||||
ss->trans_len = t->len >> 2;
|
||||
ss->read_bufs = sprd_spi_read_bufs_u32;
|
||||
ss->write_bufs = sprd_spi_write_bufs_u32;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Set transfer read or write mode */
|
||||
val = readl_relaxed(ss->base + SPRD_SPI_CTL1);
|
||||
val &= ~SPRD_SPI_RTX_MD_MASK;
|
||||
if (t->tx_buf)
|
||||
mode |= SPRD_SPI_TX_MODE;
|
||||
if (t->rx_buf)
|
||||
mode |= SPRD_SPI_RX_MODE;
|
||||
|
||||
writel_relaxed(val | mode, ss->base + SPRD_SPI_CTL1);
|
||||
|
||||
ss->trans_mode = mode;
|
||||
|
||||
/*
|
||||
* If in only receive mode, we need to trigger the SPI controller to
|
||||
* receive data automatically.
|
||||
*/
|
||||
if (ss->trans_mode == SPRD_SPI_RX_MODE)
|
||||
ss->write_bufs = sprd_spi_write_only_receive;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sprd_spi_transfer_one(struct spi_controller *sctlr,
|
||||
struct spi_device *sdev,
|
||||
struct spi_transfer *t)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = sprd_spi_setup_transfer(sdev, t);
|
||||
if (ret)
|
||||
goto setup_err;
|
||||
|
||||
ret = sprd_spi_txrx_bufs(sdev, t);
|
||||
if (ret == t->len)
|
||||
ret = 0;
|
||||
else if (ret >= 0)
|
||||
ret = -EREMOTEIO;
|
||||
|
||||
setup_err:
|
||||
spi_finalize_current_transfer(sctlr);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sprd_spi_clk_init(struct platform_device *pdev, struct sprd_spi *ss)
|
||||
{
|
||||
struct clk *clk_spi, *clk_parent;
|
||||
|
||||
clk_spi = devm_clk_get(&pdev->dev, "spi");
|
||||
if (IS_ERR(clk_spi)) {
|
||||
dev_warn(&pdev->dev, "can't get the spi clock\n");
|
||||
clk_spi = NULL;
|
||||
}
|
||||
|
||||
clk_parent = devm_clk_get(&pdev->dev, "source");
|
||||
if (IS_ERR(clk_parent)) {
|
||||
dev_warn(&pdev->dev, "can't get the source clock\n");
|
||||
clk_parent = NULL;
|
||||
}
|
||||
|
||||
ss->clk = devm_clk_get(&pdev->dev, "enable");
|
||||
if (IS_ERR(ss->clk)) {
|
||||
dev_err(&pdev->dev, "can't get the enable clock\n");
|
||||
return PTR_ERR(ss->clk);
|
||||
}
|
||||
|
||||
if (!clk_set_parent(clk_spi, clk_parent))
|
||||
ss->src_clk = clk_get_rate(clk_spi);
|
||||
else
|
||||
ss->src_clk = SPRD_SPI_DEFAULT_SOURCE;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sprd_spi_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct spi_controller *sctlr;
|
||||
struct resource *res;
|
||||
struct sprd_spi *ss;
|
||||
int ret;
|
||||
|
||||
pdev->id = of_alias_get_id(pdev->dev.of_node, "spi");
|
||||
sctlr = spi_alloc_master(&pdev->dev, sizeof(*ss));
|
||||
if (!sctlr)
|
||||
return -ENOMEM;
|
||||
|
||||
ss = spi_controller_get_devdata(sctlr);
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
ss->base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(ss->base)) {
|
||||
ret = PTR_ERR(ss->base);
|
||||
goto free_controller;
|
||||
}
|
||||
|
||||
ss->dev = &pdev->dev;
|
||||
sctlr->dev.of_node = pdev->dev.of_node;
|
||||
sctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_3WIRE | SPI_TX_DUAL;
|
||||
sctlr->bus_num = pdev->id;
|
||||
sctlr->set_cs = sprd_spi_chipselect;
|
||||
sctlr->transfer_one = sprd_spi_transfer_one;
|
||||
sctlr->auto_runtime_pm = true;
|
||||
sctlr->max_speed_hz = min_t(u32, ss->src_clk >> 1,
|
||||
SPRD_SPI_MAX_SPEED_HZ);
|
||||
|
||||
platform_set_drvdata(pdev, sctlr);
|
||||
ret = sprd_spi_clk_init(pdev, ss);
|
||||
if (ret)
|
||||
goto free_controller;
|
||||
|
||||
ret = clk_prepare_enable(ss->clk);
|
||||
if (ret)
|
||||
goto free_controller;
|
||||
|
||||
ret = pm_runtime_set_active(&pdev->dev);
|
||||
if (ret < 0)
|
||||
goto disable_clk;
|
||||
|
||||
pm_runtime_set_autosuspend_delay(&pdev->dev,
|
||||
SPRD_SPI_AUTOSUSPEND_DELAY);
|
||||
pm_runtime_use_autosuspend(&pdev->dev);
|
||||
pm_runtime_enable(&pdev->dev);
|
||||
ret = pm_runtime_get_sync(&pdev->dev);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "failed to resume SPI controller\n");
|
||||
goto err_rpm_put;
|
||||
}
|
||||
|
||||
ret = devm_spi_register_controller(&pdev->dev, sctlr);
|
||||
if (ret)
|
||||
goto err_rpm_put;
|
||||
|
||||
pm_runtime_mark_last_busy(&pdev->dev);
|
||||
pm_runtime_put_autosuspend(&pdev->dev);
|
||||
|
||||
return 0;
|
||||
|
||||
err_rpm_put:
|
||||
pm_runtime_put_noidle(&pdev->dev);
|
||||
pm_runtime_disable(&pdev->dev);
|
||||
disable_clk:
|
||||
clk_disable_unprepare(ss->clk);
|
||||
free_controller:
|
||||
spi_controller_put(sctlr);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __exit sprd_spi_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct spi_controller *sctlr = platform_get_drvdata(pdev);
|
||||
struct sprd_spi *ss = spi_controller_get_devdata(sctlr);
|
||||
int ret;
|
||||
|
||||
ret = pm_runtime_get_sync(ss->dev);
|
||||
if (ret < 0) {
|
||||
dev_err(ss->dev, "failed to resume SPI controller\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
clk_disable_unprepare(ss->clk);
|
||||
pm_runtime_put_noidle(&pdev->dev);
|
||||
pm_runtime_disable(&pdev->dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __maybe_unused sprd_spi_runtime_suspend(struct device *dev)
|
||||
{
|
||||
struct spi_controller *sctlr = dev_get_drvdata(dev);
|
||||
struct sprd_spi *ss = spi_controller_get_devdata(sctlr);
|
||||
|
||||
clk_disable_unprepare(ss->clk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __maybe_unused sprd_spi_runtime_resume(struct device *dev)
|
||||
{
|
||||
struct spi_controller *sctlr = dev_get_drvdata(dev);
|
||||
struct sprd_spi *ss = spi_controller_get_devdata(sctlr);
|
||||
int ret;
|
||||
|
||||
ret = clk_prepare_enable(ss->clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct dev_pm_ops sprd_spi_pm_ops = {
|
||||
SET_RUNTIME_PM_OPS(sprd_spi_runtime_suspend,
|
||||
sprd_spi_runtime_resume, NULL)
|
||||
};
|
||||
|
||||
static const struct of_device_id sprd_spi_of_match[] = {
|
||||
{ .compatible = "sprd,sc9860-spi", },
|
||||
{ /* sentinel */ }
|
||||
};
|
||||
|
||||
static struct platform_driver sprd_spi_driver = {
|
||||
.driver = {
|
||||
.name = "sprd-spi",
|
||||
.of_match_table = sprd_spi_of_match,
|
||||
.pm = &sprd_spi_pm_ops,
|
||||
},
|
||||
.probe = sprd_spi_probe,
|
||||
.remove = sprd_spi_remove,
|
||||
};
|
||||
|
||||
module_platform_driver(sprd_spi_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Spreadtrum SPI Controller driver");
|
||||
MODULE_AUTHOR("Lanqing Liu <lanqing.liu@spreadtrum.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in a new issue