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Message-Id: <1635747525-31243-2-git-send-email-lh.kuo@sunplus.com>
Date: Mon, 1 Nov 2021 14:18:44 +0800
From: "LH.Kuo" <lhjeff911@...il.com>
To: p.zabel@...gutronix.de, broonie@...nel.org, robh+dt@...nel.org,
linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: dvorkin@...bo.com, qinjian@...lus1.com, wells.lu@...plus.com,
"LH.Kuo" <lh.kuo@...plus.com>
Subject: [PATCH 1/2] SPI: Add SPI driver for Sunplus SP7021
Add SPI driver for Sunplus SP7021.
Signed-off-by: LH.Kuo <lh.kuo@...plus.com>
---
MAINTAINERS | 6 +
drivers/spi/Kconfig | 11 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-sunplus-sp7021.c | 1356 ++++++++++++++++++++++++++++++++++++++
4 files changed, 1374 insertions(+)
create mode 100644 drivers/spi/spi-sunplus-sp7021.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 3b79fd4..f00c466 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17945,6 +17945,12 @@ L: netdev@...r.kernel.org
S: Maintained
F: drivers/net/ethernet/dlink/sundance.c
+SUNPLUS SPI CONTROLLER INTERFACE DRIVER
+M: LH Kuo <lh.kuo@...plus.com>
+L: sdricohcs-devel@...ts.sourceforge.net (subscribers-only)
+S: Maintained
+F: drivers/spi/spi-sunplus-sp7021.c
+
SUPERH
M: Yoshinori Sato <ysato@...rs.sourceforge.jp>
M: Rich Felker <dalias@...c.org>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 83e352b..24a39c8 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -844,6 +844,17 @@ config SPI_SUN6I
help
This enables using the SPI controller on the Allwinner A31 SoCs.
+config SPI_SUNPLUS_SP7021
+ tristate "Sunplus SP7021 SPI controller"
+ depends on SOC_SP7021
+ help
+ This enable Sunplus SP7021 spi controller driver on the SP7021 SoCs.
+ This driver can also be built as a module. If so, the module will be
+ called as spi-sunplus-sp7021.
+
+ If you have a Sunplus SP7021 platform say Y here.
+ If unsure, say N.
+
config SPI_SYNQUACER
tristate "Socionext's SynQuacer HighSpeed SPI controller"
depends on ARCH_SYNQUACER || COMPILE_TEST
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 699db95..04428e7 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -117,6 +117,7 @@ obj-$(CONFIG_SPI_STM32_QSPI) += spi-stm32-qspi.o
obj-$(CONFIG_SPI_ST_SSC4) += spi-st-ssc4.o
obj-$(CONFIG_SPI_SUN4I) += spi-sun4i.o
obj-$(CONFIG_SPI_SUN6I) += spi-sun6i.o
+obj-$(CONFIG_SPI_SUNPLUS_SP7021) += spi-sunplus-sp7021.o
obj-$(CONFIG_SPI_SYNQUACER) += spi-synquacer.o
obj-$(CONFIG_SPI_TEGRA210_QUAD) += spi-tegra210-quad.o
obj-$(CONFIG_SPI_TEGRA114) += spi-tegra114.o
diff --git a/drivers/spi/spi-sunplus-sp7021.c b/drivers/spi/spi-sunplus-sp7021.c
new file mode 100644
index 0000000..632d4bf
--- /dev/null
+++ b/drivers/spi/spi-sunplus-sp7021.c
@@ -0,0 +1,1356 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Sunplus SPI controller driver
+ *
+ * Author: Sunplus Technology Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+//#define DEBUG
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/pm_runtime.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/delay.h>
+//#include <dt-bindings/pinctrl/sp7021.h>
+
+#define SLAVE_INT_IN
+
+//#define PM_RUNTIME_SPI
+
+/* ---------------------------------------------------------------------------------------------- */
+
+//#define SPI_FUNC_DEBUG
+//#define SPI_DBG_INFO
+#define SPI_DBG_ERR
+
+#ifdef SPI_FUNC_DEBUG
+#define FUNC_DBG(fmt, args ...) pr_info("[SPI] dbg (%d): " fmt "\n", __LINE__, ## args)
+#else
+#define FUNC_DBG(fmt, args ...)
+#endif
+
+#ifdef SPI_DBG_INFO
+#define DBG_INF(fmt, args ...) pr_info("[SPI] inf (%d): " fmt "\n", __LINE__, ## args)
+#else
+#define DBG_INF(fmt, args ...)
+#endif
+
+#ifdef SPI_DBG_ERR
+#define DBG_ERR(fmt, args ...) pr_info("[SPI] err (%d): " fmt "\n", __LINE__, ## args)
+#else
+#define DBG_ERR(fmt, args ...)
+#endif
+/* ---------------------------------------------------------------------------------------------- */
+
+#define SPI_FULL_DUPLEX
+
+#define MAS_REG_NAME "spi_master"
+#define SLA_REG_NAME "spi_slave"
+
+#define DMA_IRQ_NAME "dma_w_intr"
+#define MAS_IRQ_NAME "mas_risc_intr"
+
+#define SLA_IRQ_NAME "slave_risc_intr"
+
+#define SPI_TRANS_DATA_CNT (4)
+#define SPI_TRANS_DATA_SIZE (255)
+#define SPI_MSG_DATA_SIZE (SPI_TRANS_DATA_SIZE * SPI_TRANS_DATA_CNT)
+
+
+#define CLEAR_MASTER_INT (1<<6)
+#define MASTER_INT (1<<7)
+
+#define DMA_READ (0xd)
+#define SLA_SW_RST (1<<1)
+
+
+#define DMA_WRITE (0x4d)
+#define SPI_START (1<<0)
+#define SPI_BUSY (1<<0)
+#define CLEAR_DMA_W_INT (1<<7)
+#define DMA_W_INT (1<<8)
+#define CLEAR_ADDR_BIT (~(0x180))
+#define ADDR_BIT(x) (x<<7)
+#define DMA_DATA_RDY (1<<0)
+#define PENTAGRAM_SPI_SLAVE_SET (0x2c)
+
+
+
+#define TOTAL_LENGTH(x) (x<<24)
+#define TX_LENGTH(x) (x<<16)
+#define GET_LEN(x) ((x>>24)&0xFF)
+#define GET_TX_LEN(x) ((x>>16)&0xFF)
+#define GET_RX_CNT(x) ((x>>12)&0x0F)
+#define GET_TX_CNT(x) ((x>>8)&0x0F)
+
+
+
+#define FINISH_FLAG (1<<6)
+#define FINISH_FLAG_MASK (1<<15)
+#define RX_FULL_FLAG (1<<5)
+#define RX_FULL_FLAG_MASK (1<<14)
+#define RX_EMP_FLAG (1<<4)
+#define RX_EMP_FLAG_MASK (1<<13)
+#define TX_FULL_FLAG (1<<3)
+#define TX_FULL_FLAG_MASK (1<<12)
+#define TX_EMP_FLAG (1<<2)
+#define TX_EMP_FLAG_MASK (1<<11)
+#define SPI_START_FD (1<<0)
+#define FD_SEL (1<<6)
+#define LSB_SEL (1<<4)
+#define WRITE_BYTE(x) (x<<9)
+#define READ_BYTE(x) (x<<7)
+#define CLK_DIVIDER(x) (x<<16)
+#define INIT_SPI_MODE (~0x7F)
+#define CLEAN_RW_BYTE (~0x780)
+#define CLEAN_FLUG_MASK (~0xF800)
+
+
+#define DELAY_ENABLE (1<<3)
+#define CPOL_FD (1<<0)
+#define CPHA_R (1<<1)
+#define CPHA_W (1<<2)
+#define CS_POR (1<<5)
+
+#define SPI_FD_BUSY (1<<7)
+#define SPI_FD_INTR (1<<7)
+
+#define FD_SW_RST (1<<1)
+
+#define DEG_CORE_SPI_LATCH0 (0xB<<8)
+#define DEG_CORE_SPI_LATCH1 (0xC<<8)
+
+#define LSB_SEL_MST (1<<1)
+
+#define SPI_DEG_SEL(x) (x<<0)
+#define DEG_SPI_MST_MASK (0xFF<<2)
+#define DEG_SPI_MST(x) (x>>2)
+
+#define FIFO_DATA_BITS (16*8) // 16 BYTES
+
+
+#define INT_BYPASS (1<<3)
+
+
+
+/* slave*/
+#define CLEAR_SLAVE_INT (1<<8)
+#define SLAVE_DATA_RDY (1<<0)
+
+
+
+enum SPI_MODE {
+ SPI_MASTER_READ = 0,
+ SPI_MASTER_WRITE = 1,
+ SPI_MASTER_RW = 2,
+ SPI_SLAVE_READ = 3,
+ SPI_SLAVE_WRITE = 4,
+ SPI_IDLE = 5
+};
+
+
+struct SPI_MAS {
+ // Group 091 : SPI_MASTER
+ unsigned int MST_TX_DATA_ADDR ; // 00 (ADDR : 0x9C00_2D80)
+ unsigned int MST_TX_DATA_3_2_1_0 ; // 01 (ADDR : 0x9C00_2D84)
+ unsigned int MST_TX_DATA_7_6_5_4 ; // 02 (ADDR : 0x9C00_2D88)
+ unsigned int MST_TX_DATA_11_10_9_8 ; // 03 (ADDR : 0x9C00_2D8C)
+ unsigned int MST_TX_DATA_15_14_13_12 ; // 04 (ADDR : 0x9C00_2D90)
+ unsigned int G091_RESERVED_0[4] ; // (ADDR : 0x9C00_2D94-2DA0)
+ unsigned int MST_RX_DATA_3_2_1_0 ; // 09 (ADDR : 0x9C00_2DA4)
+ unsigned int MST_RX_DATA_7_6_5_4 ; // 10 (ADDR : 0x9C00_2DA8)
+ unsigned int MST_RX_DATA_11_10_9_8 ; // 11 (ADDR : 0x9C00_2DAC)
+ unsigned int MST_RX_DATA_15_14_13_12 ; // 12 (ADDR : 0x9C00_2DB0)
+ unsigned int FIFO_DATA ; // 13 (ADDR : 0x9C00_2DB4)
+ unsigned int SPI_FD_STATUS ; // 14 (ADDR : 0x9C00_2DB8)
+ unsigned int SPI_FD_CONFIG ; // 15 (ADDR : 0x9C00_2DBC)
+ unsigned int G091_RESERVED_1 ; // 16 (ADDR : 0x9C00_2DC0)
+ unsigned int SPI_CTRL_CLKSEL ; // 17 (ADDR : 0x9C00_2DC4)
+ unsigned int BYTE_NO ; // 18 (ADDR : 0x9C00_2DC8)
+ unsigned int SPI_INT_BUSY ; // 19 (ADDR : 0x9C00_2DCC)
+ unsigned int DMA_CTRL ; // 20 (ADDR : 0x9C00_2DD0)
+ unsigned int DMA_LENGTH ; // 21 (ADDR : 0x9C00_2DD4)
+ unsigned int DMA_ADDR ; // 22 (ADDR : 0x9C00_2DD8)
+ unsigned int G091_RESERVED_2[1] ; // 23 (ADDR : 0x9C00_2DDC)
+ unsigned int DMA_ADDR_STAT ; // 24 (ADDR : 0x9C00_2DE0)
+ unsigned int G091_RESERVED_3[1] ; // 25 (ADDR : 0x9C00_2DE4)
+ unsigned int UART_DMA_CTRL ; // 26 (ADDR : 0x9C00_2DE8)
+ unsigned int G091_RESERVED_4[1] ; // 27 (ADDR : 0x9C00_2DEC)
+ unsigned int SPI_MST_DEBUG_SEL ; // 28 (ADDR : 0x9C00_2DF0)
+ unsigned int SPI_COM_DEBUG_SEL ; // 29 (ADDR : 0x9C00_2DF4)
+ unsigned int SPI_EXTRA_CYCLE ; // 30 (ADDR : 0x9C00_2DF8)
+ unsigned int MST_DMA_DATA_RDY ; // 31 (ADDR : 0x9C00_2DFC)
+};
+
+
+struct SPI_SLA {
+ // Group 092 : SPI_SLAVE
+ unsigned int SLV_TX_DATA_2_1_0 ; // 00 (ADDR : 0x9C00_2E00)
+ unsigned int SLV_TX_DATA_6_5_4_3 ; // 01 (ADDR : 0x9C00_2E04)
+ unsigned int SLV_TX_DATA_10_9_8_7 ; // 02 (ADDR : 0x9C00_2E08)
+ unsigned int SLV_TX_DATA_14_13_12_11 ; // 03 (ADDR : 0x9C00_2E0C)
+ unsigned int SLV_TX_DATA_15 ; // 04 (ADDR : 0x9C00_2E10)
+ unsigned int G092_RESERVED_0[4] ; // (ADDR : 0x9C00_2E14-2E20)
+ unsigned int SLV_RX_DATA_3_2_1_0 ; // 09 (ADDR : 0x9C00_2E24)
+ unsigned int SLV_RX_DATA_7_6_5_4 ; // 10 (ADDR : 0x9C00_2E28)
+ unsigned int SLV_RX_DATA_11_10_9_8 ; // 11 (ADDR : 0x9C00_2E2C)
+ unsigned int SLV_RX_DATA_15_14_13_12 ; // 12 (ADDR : 0x9C00_2E30)
+ unsigned int G092_RESERVED_1[4] ; // (ADDR : 0x9C00_2E34-2E40)
+ unsigned int RISC_INT_DATA_RDY ; // 17 (ADDR : 0x9C00_2E44)
+ unsigned int SLV_DMA_CTRL ; // 18 (ADDR : 0x9C00_2E48)
+ unsigned int SLV_DMA_LENGTH ; // 19 (ADDR : 0x9C00_2E4C)
+ unsigned int SLV_DMA_INI_ADDR ; // 20 (ADDR : 0x9C00_2E50)
+ unsigned int G092_RESERVED_2[2] ; // (ADDR : 0x9C00_2E54-2E58)
+ unsigned int ADDR_SPI_BUSY ; // 23 (ADDR : 0x9C00_2E5C)
+ unsigned int G092_RESERVED_3[8] ; // (ADDR : 0x9C00_2E60-2E7C)
+};
+
+
+
+enum {
+ SPI_MASTER,
+ SPI_SLAVE,
+};
+
+
+struct pentagram_spi_master {
+
+ struct device *dev;
+
+ int mode;
+
+ struct spi_master *master;
+ struct spi_controller *ctlr;
+
+ void __iomem *mas_base;
+
+ void __iomem *sla_base;
+
+ u32 message_config;
+
+ int dma_irq;
+ int mas_irq;
+ int sla_irq;
+
+ struct clk *spi_clk;
+ struct reset_control *rstc;
+
+ spinlock_t lock;
+ struct mutex buf_lock;
+ unsigned int spi_max_frequency;
+ dma_addr_t tx_dma_phy_base;
+ dma_addr_t rx_dma_phy_base;
+ void *tx_dma_vir_base;
+ void *rx_dma_vir_base;
+ struct completion isr_done; // complete() at *master_(dma|mas)_irq()
+ struct completion sla_isr; // completion() at spi_S_irq() - slave irq jandler
+ unsigned int bufsiz;
+
+ unsigned int rx_cur_len;
+ unsigned int tx_cur_len;
+
+ u8 tx_data_buf[SPI_TRANS_DATA_SIZE];
+ u8 rx_data_buf[SPI_TRANS_DATA_SIZE];
+
+ int isr_flag;
+
+ unsigned int data_unit;
+};
+
+
+static unsigned int bufsiz = 4096;
+
+static void pentagram_set_cs(struct spi_device *_s, bool _on)
+{
+ if (_s->mode & SPI_NO_CS)
+ return;
+ if (!(_s->cs_gpiod))
+ return;
+ dev_dbg(&(_s->dev), "%d gpiod:%d", _on, desc_to_gpio(_s->cs_gpiod));
+ if (_s->mode & SPI_CS_HIGH)
+ _on = !_on;
+ gpiod_set_value_cansleep(_s->cs_gpiod, _on);
+}
+
+// spi slave irq handler
+static irqreturn_t pentagram_spi_S_irq(int _irq, void *_dev)
+{
+ unsigned long flags;
+ struct pentagram_spi_master *pspim = (struct pentagram_spi_master *)_dev;
+ struct SPI_SLA *sr = (struct SPI_SLA *)pspim->sla_base;
+
+ FUNC_DBG();
+ spin_lock_irqsave(&pspim->lock, flags);
+ writel(readl(&sr->RISC_INT_DATA_RDY) | CLEAR_SLAVE_INT, &sr->RISC_INT_DATA_RDY);
+ spin_unlock_irqrestore(&pspim->lock, flags);
+ complete(&pspim->sla_isr);
+ return IRQ_HANDLED;
+}
+
+// slave DMA rw (unused now)
+// FIXME: probably frop this?
+int pentagram_spi_slave_dma_rw(struct spi_device *spi, u8 *buf, unsigned int len, int RW_phase)
+{
+ struct pentagram_spi_master *pspim = spi_controller_get_devdata(spi->controller);
+
+ struct SPI_SLA *spis_reg = (struct SPI_SLA *)(pspim->sla_base);
+ struct SPI_MAS *spim_reg = (struct SPI_MAS *)(pspim->mas_base);
+ struct device dev = spi->dev;
+ unsigned long timeout = msecs_to_jiffies(2000);
+
+ FUNC_DBG();
+ mutex_lock(&pspim->buf_lock);
+
+ if (RW_phase == SPI_SLAVE_WRITE) {
+ memcpy(pspim->tx_dma_vir_base, buf, len);
+ writel_relaxed(DMA_WRITE, &spis_reg->SLV_DMA_CTRL);
+ writel_relaxed(len, &spis_reg->SLV_DMA_LENGTH);
+ writel_relaxed(pspim->tx_dma_phy_base, &spis_reg->SLV_DMA_INI_ADDR);
+ writel(readl(&spis_reg->RISC_INT_DATA_RDY) | SLAVE_DATA_RDY,
+ &spis_reg->RISC_INT_DATA_RDY);
+ //regs1->SLV_DMA_CTRL = 0x4d;
+ //regs1->SLV_DMA_LENGTH = 0x50;
+ //regs1->SLV_DMA_INI_ADDR = 0x300;
+ //regs1->RISC_INT_DATA_RDY |= 0x1;
+ } else if (RW_phase == SPI_SLAVE_READ) {
+ reinit_completion(&pspim->isr_done);
+ writel(DMA_READ, &spis_reg->SLV_DMA_CTRL);
+ writel(len, &spis_reg->SLV_DMA_LENGTH);
+ writel(pspim->rx_dma_phy_base, &spis_reg->SLV_DMA_INI_ADDR);
+
+ if (!wait_for_completion_timeout(&pspim->isr_done, timeout)) {
+ dev_err(&dev, "wait_for_completion_timeout\n");
+ goto exit_spi_slave_rw;
+ }
+ while ((readl(&spim_reg->DMA_CTRL) & DMA_W_INT) == DMA_W_INT) {
+ dev_dbg(&dev, "spim_reg->DMA_CTRL 0x%x\n", readl(&spim_reg->DMA_CTRL));
+ };
+ memcpy(buf, pspim->rx_dma_vir_base, len);
+ writel(SLA_SW_RST, &spis_reg->SLV_DMA_CTRL);
+ /* read*/
+ //regs1->SLV_DMA_CTRL = 0xd;
+ //regs1->SLV_DMA_LENGTH = 0x50;
+ //regs1->SLV_DMA_INI_ADDR = 0x400;
+ }
+
+exit_spi_slave_rw:
+ mutex_unlock(&pspim->buf_lock);
+ return 0;
+}
+
+// slave only. usually called on driver remove
+static int pentagram_spi_S_abort(struct spi_controller *_c)
+{
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(_c);
+
+ complete(&pspim->sla_isr);
+ complete(&pspim->isr_done);
+ return 0;
+}
+
+// slave R/W, called from S_transfer_one() only
+int pentagram_spi_S_rw(struct spi_device *_s, struct spi_transfer *_t, int RW_phase)
+{
+ struct pentagram_spi_master *pspim = spi_controller_get_devdata(_s->controller);
+ struct SPI_SLA *spis_reg = (struct SPI_SLA *)(pspim->sla_base);
+ struct device *devp = &(_s->dev);
+
+ FUNC_DBG();
+ mutex_lock(&pspim->buf_lock);
+
+ if (RW_phase == SPI_SLAVE_WRITE) {
+ DBG_INF("S_WRITE len %d", _t->len);
+ reinit_completion(&pspim->sla_isr);
+
+ if (_t->tx_dma == pspim->tx_dma_phy_base)
+ memcpy(pspim->tx_dma_vir_base, _t->tx_buf, _t->len);
+
+ writel_relaxed(DMA_WRITE, &spis_reg->SLV_DMA_CTRL);
+ writel_relaxed(_t->len, &spis_reg->SLV_DMA_LENGTH);
+ writel_relaxed(_t->tx_dma, &spis_reg->SLV_DMA_INI_ADDR);
+ writel(readl(&spis_reg->RISC_INT_DATA_RDY) | SLAVE_DATA_RDY,
+ &spis_reg->RISC_INT_DATA_RDY);
+
+ if (wait_for_completion_interruptible(&pspim->sla_isr))
+ dev_err(devp, "%s() wait_for_completion timeout\n", __func__);
+
+ } else if (RW_phase == SPI_SLAVE_READ) {
+ DBG_INF("S_READ len %d", _t->len);
+ reinit_completion(&pspim->isr_done);
+ writel(DMA_READ, &spis_reg->SLV_DMA_CTRL);
+ writel(_t->len, &spis_reg->SLV_DMA_LENGTH);
+ writel(_t->rx_dma, &spis_reg->SLV_DMA_INI_ADDR);
+
+ // wait for DMA to complete
+ if (wait_for_completion_interruptible(&pspim->isr_done)) {
+ dev_err(devp, "%s() wait_for_completion timeout\n", __func__);
+ goto exit_spi_slave_rw;
+ }
+ // FIXME: is "len" correct there?
+ if (_t->tx_dma == pspim->tx_dma_phy_base)
+ memcpy(_t->rx_buf, pspim->rx_dma_vir_base, _t->len);
+
+ writel(SLA_SW_RST, &spis_reg->SLV_DMA_CTRL);
+ }
+
+exit_spi_slave_rw:
+ mutex_unlock(&pspim->buf_lock);
+ return 0;
+}
+
+// spi master irq handler
+static irqreturn_t pentagram_spi_M_irq_dma(int _irq, void *_dev)
+{
+ unsigned long flags;
+ struct pentagram_spi_master *pspim = (struct pentagram_spi_master *)_dev;
+ struct SPI_MAS *sr = (struct SPI_MAS *)pspim->mas_base;
+
+ FUNC_DBG();
+ spin_lock_irqsave(&pspim->lock, flags);
+ writel(readl(&sr->DMA_CTRL) | CLEAR_DMA_W_INT, &sr->DMA_CTRL);
+ spin_unlock_irqrestore(&pspim->lock, flags);
+ complete(&pspim->isr_done);
+ return IRQ_HANDLED;
+}
+
+void sp7021spi_rb(struct pentagram_spi_master *_m, u8 _len)
+{
+ struct SPI_MAS *sr = (struct SPI_MAS *)_m->mas_base;
+ int i;
+
+ for (i = 0; i < _len; i++) {
+ _m->rx_data_buf[_m->rx_cur_len] = readl(&sr->FIFO_DATA);
+ DBG_INF("RX 0x%x _cur_len = %d", _m->rx_data_buf[_m->rx_cur_len], _m->rx_cur_len);
+ _m->rx_cur_len++;
+ }
+}
+void sp7021spi_wb(struct pentagram_spi_master *_m, u8 _len)
+{
+ struct SPI_MAS *sr = (struct SPI_MAS *)_m->mas_base;
+ int i;
+
+ for (i = 0; i < _len; i++) {
+ DBG_INF("TX 0x%02x _cur_len %d", _m->tx_data_buf[_m->tx_cur_len], _m->tx_cur_len);
+ writel(_m->tx_data_buf[_m->tx_cur_len], &sr->FIFO_DATA);
+ _m->tx_cur_len++;
+ }
+}
+
+static irqreturn_t pentagram_spi_M_irq(int _irq, void *_dev)
+{
+ unsigned long flags;
+ struct pentagram_spi_master *pspim = (struct pentagram_spi_master *)_dev;
+ struct SPI_MAS *sr = (struct SPI_MAS *)pspim->mas_base;
+ u32 fd_status = 0;
+ unsigned int tx_len, rx_cnt, tx_cnt;
+ bool isrdone = false;
+
+ FUNC_DBG();
+
+ spin_lock_irqsave(&pspim->lock, flags);
+
+ fd_status = readl(&sr->SPI_FD_STATUS);
+ tx_cnt = GET_TX_CNT(fd_status);
+ tx_len = GET_TX_LEN(fd_status);
+
+ if ((fd_status & TX_EMP_FLAG) && (fd_status & RX_EMP_FLAG) && (GET_LEN(fd_status) == 0))
+ goto fin_irq;
+
+ if (fd_status & FINISH_FLAG)
+ DBG_INF("FINISH_FLAG");
+ if (fd_status & TX_EMP_FLAG)
+ DBG_INF("TX_EMP_FLAG");
+ if (fd_status & RX_FULL_FLAG)
+ DBG_INF("RX_FULL_FLAG");
+ rx_cnt = GET_RX_CNT(fd_status);
+ // RX_FULL_FLAG means RX buffer is full (16 bytes)
+ if (fd_status & RX_FULL_FLAG)
+ rx_cnt = pspim->data_unit;
+
+ tx_cnt = min(tx_len - pspim->tx_cur_len, pspim->data_unit - tx_cnt);
+
+ DBG_INF("fd_st=0x%x rx_c:%d tx_c:%d tx_l:%d", fd_status, rx_cnt, tx_cnt, tx_len);
+
+ if (rx_cnt > 0)
+ sp7021spi_rb(pspim, rx_cnt);
+ if (tx_cnt > 0)
+ sp7021spi_wb(pspim, tx_cnt);
+
+ fd_status = readl(&sr->SPI_FD_STATUS);
+
+ if ((fd_status & FINISH_FLAG) || (GET_TX_LEN(fd_status) == pspim->tx_cur_len)) {
+
+ while (GET_LEN(fd_status) != pspim->rx_cur_len) {
+ fd_status = readl(&sr->SPI_FD_STATUS);
+ if (fd_status & RX_FULL_FLAG)
+ rx_cnt = pspim->data_unit;
+ else
+ rx_cnt = GET_RX_CNT(fd_status);
+
+ if (rx_cnt > 0)
+ sp7021spi_rb(pspim, rx_cnt);
+ }
+ writel(readl(&sr->SPI_INT_BUSY) | CLEAR_MASTER_INT, &sr->SPI_INT_BUSY);
+ isrdone = true;
+ }
+fin_irq:
+ if (isrdone)
+ complete(&pspim->isr_done);
+ spin_unlock_irqrestore(&pspim->lock, flags);
+ DBG_INF("handled irq %d", isrdone);
+ return IRQ_HANDLED;
+}
+
+// called in *controller_transfer_one*
+static void spspi_prep_transfer(struct spi_controller *_c, struct spi_device *_s)
+{
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(_c);
+
+ pspim->tx_cur_len = 0;
+ pspim->rx_cur_len = 0;
+ pspim->data_unit = FIFO_DATA_BITS / _s->bits_per_word;
+ pspim->isr_flag = SPI_IDLE;
+ DBG_INF("pspim->data_unit %d unit", pspim->data_unit);
+}
+
+static void spspi_delay_ns(u32 _ns)
+{
+
+ if (!_ns)
+ return;
+ if (_ns <= 1000)
+ ndelay(_ns);
+ else {
+ u32 us = DIV_ROUND_UP(_ns, 1000);
+
+ if (us <= 10)
+ udelay(us);
+ else
+ usleep_range(us, us + DIV_ROUND_UP(us, 10));
+ }
+}
+
+// called from *transfer* functions, set clock there
+static void pentagram_spi_setup_transfer(struct spi_device *_s,
+ struct spi_controller *_c, struct spi_transfer *_t)
+{
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(_c);
+ struct SPI_MAS *spim_reg = (struct SPI_MAS *)pspim->mas_base;
+ u32 rc = 0, rs = 0;
+ unsigned int clk_rate;
+ unsigned int div;
+ unsigned int clk_sel;
+
+ FUNC_DBG();
+
+ dev_dbg(&(_s->dev), "setup %dHz", _s->max_speed_hz);
+ dev_dbg(&(_s->dev), "tx %p, rx %p, len %d", _t->tx_buf, _t->rx_buf, _t->len);
+ // set clock
+ clk_rate = clk_get_rate(pspim->spi_clk);
+ if (_t->speed_hz <= _s->max_speed_hz)
+ div = clk_rate / _t->speed_hz;
+ else if (_s->max_speed_hz <= _c->max_speed_hz)
+ div = clk_rate / _s->max_speed_hz;
+ else if (_c->max_speed_hz < pspim->spi_max_frequency)
+ div = clk_rate / _c->max_speed_hz;
+ else
+ div = clk_rate / pspim->spi_max_frequency;
+
+ dev_dbg(&(_s->dev), "clk_rate: %d div %d", clk_rate, div);
+
+ clk_sel = (div / 2) - 1;
+ // set full duplex (bit 6) and fd freq (bits 31:16)
+ rc = FD_SEL | (0xffff << 16);
+ rs = FD_SEL | ((clk_sel & 0xffff) << 16);
+ writel((pspim->message_config & ~rc) | rs, &(spim_reg->SPI_FD_CONFIG));
+}
+
+
+static int pentagram_spi_master_combine_write_read(struct spi_controller *_c,
+ struct spi_transfer *first, unsigned int transfers_cnt)
+{
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(_c);
+ struct SPI_MAS *sr = (struct SPI_MAS *)pspim->mas_base;
+ unsigned int data_len = 0;
+ u32 reg_temp = 0;
+ unsigned long timeout = msecs_to_jiffies(200);
+ unsigned int i, len_temp;
+ int ret;
+ struct spi_transfer *t = first;
+ bool xfer_rx = false;
+
+ FUNC_DBG();
+
+ memset(&pspim->tx_data_buf[0], 0, SPI_TRANS_DATA_SIZE);
+ dev_dbg(&(_c->dev), "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf, t->len);
+
+ mutex_lock(&pspim->buf_lock);
+ reinit_completion(&pspim->isr_done);
+
+ for (i = 0; i < transfers_cnt; i++) {
+ if (t->tx_buf)
+ memcpy(&pspim->tx_data_buf[data_len], t->tx_buf, t->len);
+ if (t->rx_buf)
+ xfer_rx = true;
+ data_len += t->len;
+ t = list_entry(t->transfer_list.next, struct spi_transfer, transfer_list);
+ }
+ dev_dbg(&(_c->dev), "data_len %d xfer_rx %d", data_len, xfer_rx);
+
+ // set SPI FIFO data for full duplex (SPI_FD fifo_data) 91.13
+ if (pspim->tx_cur_len < data_len) {
+ len_temp = min(pspim->data_unit, data_len);
+ sp7021spi_wb(pspim, len_temp);
+ }
+ // initial SPI master config and change to Full-Duplex mode (SPI_FD_CONFIG) 91.15
+ reg_temp = readl(&sr->SPI_FD_CONFIG);
+ reg_temp &= CLEAN_RW_BYTE;
+ reg_temp &= CLEAN_FLUG_MASK;
+ reg_temp |= FD_SEL;
+ // set SPI master config for full duplex (SPI_FD_CONFIG) 91.15
+ reg_temp |= FINISH_FLAG_MASK | TX_EMP_FLAG_MASK | RX_FULL_FLAG_MASK;
+ reg_temp |= WRITE_BYTE(0) | READ_BYTE(0); // set read write byte from fifo
+ writel(reg_temp, &sr->SPI_FD_CONFIG);
+ DBG_INF("SPI_FD_CONFIG =0x%x", readl(&sr->SPI_FD_CONFIG));
+ // set SPI STATUS and start SPI for full duplex (SPI_FD_STATUS) 91.13
+ writel(TOTAL_LENGTH(data_len) | TX_LENGTH(data_len) | SPI_START_FD, &sr->SPI_FD_STATUS);
+ writel(readl(&sr->SPI_INT_BUSY) | INT_BYPASS, &sr->SPI_INT_BUSY);
+
+ if (!wait_for_completion_timeout(&pspim->isr_done, timeout)) {
+ DBG_INF("wait_for_completion timeout");
+ ret = 1;
+ goto free_master_combite_rw;
+ }
+
+ if (xfer_rx == false) {
+ ret = 0;
+ goto free_master_combite_rw;
+ }
+
+ data_len = 0;
+ t = first;
+ for (i = 0; i < transfers_cnt; i++) {
+ if (t->rx_buf)
+ memcpy(t->rx_buf, &pspim->rx_data_buf[data_len], t->len);
+
+ data_len += t->len;
+ t = list_entry(t->transfer_list.next, struct spi_transfer, transfer_list);
+ }
+ ret = 0;
+free_master_combite_rw:
+ // reset SPI
+ writel(readl(&sr->SPI_FD_CONFIG) & CLEAN_FLUG_MASK, &sr->SPI_FD_CONFIG);
+
+ if (pspim->message_config & CPOL_FD)
+ writel(pspim->message_config, &sr->SPI_FD_CONFIG);
+
+ mutex_unlock(&pspim->buf_lock);
+ return ret;
+}
+
+
+static int pentagram_spi_master_transfer(struct spi_controller *_c, struct spi_device *_s,
+ struct spi_transfer *xfer)
+{
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(_c);
+ struct SPI_MAS *sr = (struct SPI_MAS *)pspim->mas_base;
+ u32 reg_temp = 0;
+ unsigned long timeout = msecs_to_jiffies(200);
+ unsigned int i;
+ int ret;
+ long cret;
+ unsigned int xfer_cnt, xfer_len, last_len;
+ struct spi_transfer *t = xfer;
+
+ FUNC_DBG();
+
+ xfer_cnt = t->len / SPI_TRANS_DATA_SIZE;
+ last_len = t->len % SPI_TRANS_DATA_SIZE;
+
+ memset(&pspim->tx_data_buf[0], 0, SPI_TRANS_DATA_SIZE);
+
+ dev_dbg(&(_s->dev), "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf, t->len);
+
+ t->tx_buf+SPI_TRANS_DATA_SIZE, &(t->tx_buf[SPI_TRANS_DATA_SIZE]));
+
+ for (i = 0; i <= xfer_cnt; i++) {
+
+ mutex_lock(&pspim->buf_lock);
+
+ spspi_prep_transfer(_c, _s);
+ pentagram_spi_setup_transfer(_s, _c, xfer);
+
+ reinit_completion(&pspim->isr_done);
+
+ if (i == xfer_cnt)
+ xfer_len = last_len;
+ else
+ xfer_len = SPI_TRANS_DATA_SIZE;
+
+ if (t->tx_buf)
+ memcpy(pspim->tx_data_buf, t->tx_buf+i*SPI_TRANS_DATA_SIZE, xfer_len);
+
+ // set SPI FIFO data for full duplex (SPI_FD fifo_data) 91.13
+ if (pspim->tx_cur_len < xfer_len) {
+ reg_temp = min(pspim->data_unit, xfer_len);
+ sp7021spi_wb(pspim, reg_temp);
+ }
+
+ // initial SPI master config and change to Full-Duplex mode (SPI_FD_CONFIG) 91.15
+ reg_temp = readl(&sr->SPI_FD_CONFIG);
+ reg_temp &= CLEAN_RW_BYTE;
+ reg_temp &= CLEAN_FLUG_MASK;
+ reg_temp |= FD_SEL;
+ // set SPI master config for full duplex (SPI_FD_CONFIG) 91.15
+ reg_temp |= FINISH_FLAG_MASK | TX_EMP_FLAG_MASK | RX_FULL_FLAG_MASK;
+ reg_temp |= WRITE_BYTE(0) | READ_BYTE(0); // set read write byte from fifo
+ writel(reg_temp, &sr->SPI_FD_CONFIG);
+ dev_dbg(&(_s->dev), "SPI_FD_CONFIG =0x%x", readl(&sr->SPI_FD_CONFIG));
+ // set SPI STATUS and start SPI for full duplex (SPI_FD_STATUS) 91.13
+ dev_dbg(&(_s->dev), "TOTAL_LENGTH =0x%x TX_LENGTH =0x%x xfer_len =0x%x ",
+ TOTAL_LENGTH(xfer_len), TX_LENGTH(xfer_len), xfer_len);
+ writel(TOTAL_LENGTH(xfer_len) | TX_LENGTH(xfer_len) | SPI_START_FD,
+ &sr->SPI_FD_STATUS);
+ DBG_INF("set SPI_FD_STATUS =0x%x", readl(&sr->SPI_FD_STATUS));
+
+ cret = wait_for_completion_interruptible_timeout(&pspim->isr_done, timeout);
+ if (cret <= 0) {
+ dev_dbg(&(_s->dev), "wait_for_completion cret=%ld\n", cret);
+ writel(readl(&sr->SPI_FD_CONFIG) & CLEAN_FLUG_MASK, &sr->SPI_FD_CONFIG);
+ ret = 1;
+ goto free_master_combite_rw;
+ }
+
+ reg_temp = readl(&sr->SPI_FD_STATUS);
+ if (reg_temp & FINISH_FLAG)
+ writel(readl(&sr->SPI_FD_CONFIG) & CLEAN_FLUG_MASK, &sr->SPI_FD_CONFIG);
+
+ if (t->rx_buf)
+ memcpy(t->rx_buf+i*SPI_TRANS_DATA_SIZE, pspim->rx_data_buf, xfer_len);
+
+ ret = 0;
+
+free_master_combite_rw:
+
+ if (pspim->message_config & CPOL_FD)
+ writel(pspim->message_config, &sr->SPI_FD_CONFIG);
+
+ mutex_unlock(&pspim->buf_lock);
+ }
+
+ return ret;
+}
+
+// called when child device is registering on the bus
+static int pentagram_spi_D_setup(struct spi_device *_s)
+{
+
+#ifdef CONFIG_PM_RUNTIME_SPI
+
+ struct pentagram_spi_master *pspim = spi_controller_get_devdata(_s->controller);
+
+ if (pm_runtime_enabled(pspim->dev)) {
+ ret = pm_runtime_get_sync(pspim->dev)
+ if (ret < 0)
+ goto pm_out;
+ }
+#endif
+
+#ifdef CONFIG_PM_RUNTIME_SPI
+ pm_runtime_put(pspim->dev);
+#endif
+ return 0;
+#ifdef CONFIG_PM_RUNTIME_SPI
+pm_out:
+ pm_runtime_mark_last_busy(pspim->dev);
+ pm_runtime_put_autosuspend(pspim->dev);
+ DBG_INF("pm_out");
+ return 0;
+#endif
+}
+
+// preliminary set CS, CPOL, CPHA and LSB
+// called for both - master and slave. See drivers/spi/spi.c
+static int pentagram_spi_controller_prepare_message(struct spi_controller *_c,
+ struct spi_message *_m)
+{
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(_c);
+ struct SPI_MAS *sr = (struct SPI_MAS *)pspim->mas_base;
+ struct spi_device *s = _m->spi;
+ // reg clear bits and set bits
+ u32 rs = 0;
+
+ FUNC_DBG();
+ dev_dbg(&(s->dev), "setup %d bpw, %scpol, %scpha, %scs-high, %slsb-first %xcs_gpio\n",
+ s->bits_per_word,
+ s->mode & SPI_CPOL ? "" : "~",
+ s->mode & SPI_CPHA ? "" : "~",
+ s->mode & SPI_CS_HIGH ? "" : "~",
+ s->mode & SPI_LSB_FIRST ? "" : "~",
+ s->cs_gpio);
+
+ writel(readl(&sr->SPI_FD_STATUS) | FD_SW_RST, &sr->SPI_FD_STATUS);
+
+ //set up full duplex frequency and enable full duplex
+ rs = FD_SEL | ((0xffff) << 16);
+
+ if (s->mode & SPI_CPOL)
+ rs |= CPOL_FD;
+
+ if (s->mode & SPI_LSB_FIRST)
+ rs |= LSB_SEL;
+
+ if (s->mode & SPI_CS_HIGH)
+ rs |= CS_POR;
+
+ if (s->mode & SPI_CPHA)
+ rs |= CPHA_R;
+ else
+ rs |= CPHA_W;
+
+ rs |= WRITE_BYTE(0) | READ_BYTE(0); // set read write byte from fifo
+
+ pspim->message_config = rs;
+
+ if (pspim->message_config & CPOL_FD)
+ writel(pspim->message_config, &sr->SPI_FD_CONFIG);
+
+ return 0;
+}
+static int pentagram_spi_controller_unprepare_message(struct spi_controller *ctlr,
+ struct spi_message *msg)
+{
+ FUNC_DBG();
+ return 0;
+}
+
+static size_t pentagram_spi_max_length(struct spi_device *spi)
+{
+ return SPI_MSG_DATA_SIZE;
+}
+
+
+
+// SPI-slave R/W
+static int pentagram_spi_S_transfer_one(struct spi_controller *_c, struct spi_device *_s,
+ struct spi_transfer *_t)
+{
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(_c);
+ struct device *dev = pspim->dev;
+ int mode = SPI_IDLE, ret = 0;
+
+ FUNC_DBG();
+#ifdef CONFIG_PM_RUNTIME_SPI
+ if (pm_runtime_enabled(pspim->dev)) {
+ ret = pm_runtime_get_sync(pspim->dev);
+ if (ret < 0)
+ goto pm_out;
+ }
+#endif
+
+ if (spi_controller_is_slave(_c)) {
+
+ pspim->isr_flag = SPI_IDLE;
+
+ if ((_t->tx_buf) && (_t->rx_buf)) {
+ dev_dbg(&_c->dev, "%s() wrong command\n", __func__);
+ } else if (_t->tx_buf) {
+ /* tx_buf is a const void* where we need a void * for
+ * the dma mapping
+ */
+ void *nonconst_tx = (void *)_t->tx_buf;
+
+ _t->tx_dma = dma_map_single(dev, nonconst_tx,
+ _t->len, DMA_TO_DEVICE);
+
+ if (dma_mapping_error(dev, _t->tx_dma)) {
+ if (_t->len <= bufsiz) {
+ _t->tx_dma = pspim->tx_dma_phy_base;
+ mode = SPI_SLAVE_WRITE;
+ } else
+ mode = SPI_IDLE;
+
+ } else
+ mode = SPI_SLAVE_WRITE;
+ } else if (_t->rx_buf) {
+
+ _t->rx_dma = dma_map_single(dev, _t->rx_buf,
+ _t->len, DMA_FROM_DEVICE);
+
+ if (dma_mapping_error(dev, _t->rx_dma)) {
+ if (_t->len <= bufsiz) {
+ _t->rx_dma = pspim->rx_dma_phy_base;
+ mode = SPI_SLAVE_READ;
+ } else
+ mode = SPI_IDLE;
+ } else
+ mode = SPI_SLAVE_READ;
+ }
+
+ switch (mode) {
+ case SPI_SLAVE_WRITE:
+ case SPI_SLAVE_READ:
+ pentagram_spi_S_rw(_s, _t, mode);
+ break;
+ default:
+ DBG_INF("idle?");
+ break;
+ }
+
+
+ //if((xfer->rx_buf) && (xfer->rx_dma == pspim->rx_dma_phy_base)){
+ // memcpy(xfer->rx_buf, pspim->rx_dma_vir_base, xfer->len);
+ //}
+
+ if ((_t->tx_buf) && (_t->tx_dma != pspim->tx_dma_phy_base))
+ dma_unmap_single(dev, _t->tx_dma,
+ _t->len, DMA_TO_DEVICE);
+
+ if ((_t->rx_buf) && (_t->rx_dma != pspim->rx_dma_phy_base))
+ dma_unmap_single(dev, _t->rx_dma,
+ _t->len, DMA_FROM_DEVICE);
+
+ }
+
+ spi_finalize_current_transfer(_c);
+
+#ifdef CONFIG_PM_RUNTIME_SPI
+ pm_runtime_put(pspim->dev);
+ DBG_INF("pm_put");
+#endif
+ return ret;
+#ifdef CONFIG_PM_RUNTIME_SPI
+pm_out:
+ pm_runtime_mark_last_busy(pspim->dev);
+ pm_runtime_put_autosuspend(pspim->dev);
+ DBG_INF("pm_out");
+ return ret;
+#endif
+}
+
+
+static int pentagram_spi_M_transfer_one_message(struct spi_controller *ctlr, struct spi_message *m)
+{
+ //struct pentagram_spi_master *pspim = spi_master_get_devdata(ctlr);
+ struct spi_device *spi = m->spi;
+ unsigned int xfer_cnt = 0, total_len = 0;
+ bool start_xfer = false;
+ struct spi_transfer *xfer, *first_xfer = NULL;
+ int ret;
+ bool keep_cs = false;
+
+ FUNC_DBG();
+
+#ifdef CONFIG_PM_RUNTIME_SPI
+ if (pm_runtime_enabled(pspim->dev)) {
+ ret = pm_runtime_get_sync(pspim->dev);
+ if (ret < 0)
+ goto pm_out;
+ }
+#endif
+ pentagram_set_cs(spi, true);
+
+ list_for_each_entry(xfer, &m->transfers, transfer_list) {
+ if (!first_xfer)
+ first_xfer = xfer;
+ total_len += xfer->len;
+
+ /* all combined transfers have to have the same speed */
+ if (first_xfer->speed_hz != xfer->speed_hz) {
+ dev_err(&(spi->dev), "unable to change speed between transfers\n");
+ ret = -EINVAL;
+ break;
+ }
+ /* CS will be deasserted directly after transfer */
+// if ( xfer->delay_usecs) {
+// DBG_ERR( "can't keep CS asserted after transfer");
+// ret = -EINVAL;
+// break;
+// }
+ if (xfer->len > SPI_MSG_DATA_SIZE) {
+ dev_err(&(spi->dev), "over total trans-length xfer->len = %d", xfer->len);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (list_is_last(&xfer->transfer_list, &m->transfers))
+ DBG_INF("xfer = transfer_list");
+ if (total_len > SPI_TRANS_DATA_SIZE)
+ DBG_INF("(total_len > SPI_TRANS_DATA_SIZE)");
+ if (xfer->cs_change)
+ DBG_INF("xfer->cs_change");
+
+ if (list_is_last(&xfer->transfer_list, &m->transfers)
+ || (total_len > SPI_TRANS_DATA_SIZE)
+ || xfer->cs_change || (xfer->len > SPI_TRANS_DATA_SIZE))
+ start_xfer = true;
+
+
+ dev_dbg(&(spi->dev), "start_xfer:%d total_len:%d\n", start_xfer, total_len);
+ if (start_xfer != true) {
+ xfer_cnt++;
+ continue;
+ }
+ if (total_len <= SPI_TRANS_DATA_SIZE)
+ xfer_cnt++;
+
+ if (xfer_cnt > 0) {
+ spspi_prep_transfer(ctlr, spi);
+ pentagram_spi_setup_transfer(spi, ctlr, first_xfer);
+ ret = pentagram_spi_master_combine_write_read(ctlr, first_xfer, xfer_cnt);
+ }
+
+ if (total_len > SPI_TRANS_DATA_SIZE)
+ ret = pentagram_spi_master_transfer(ctlr, spi, xfer);
+
+ if (xfer->delay.value)
+ spspi_delay_ns(xfer->delay.value * 1000);
+ if (xfer->cs_change) {
+ if (list_is_last(&xfer->transfer_list, &m->transfers))
+ keep_cs = true;
+ else {
+ pentagram_set_cs(spi, false);
+ spi_delay_to_ns(&xfer->cs_change_delay, xfer);
+ pentagram_set_cs(spi, true);
+ }
+ }
+
+ m->actual_length += total_len;
+
+ first_xfer = NULL;
+ xfer_cnt = 0;
+ total_len = 0;
+ start_xfer = false;
+ }
+
+ if (ret != 0 || !keep_cs)
+ pentagram_set_cs(spi, false);
+ m->status = ret;
+ spi_finalize_current_message(ctlr);
+
+#ifdef CONFIG_PM_RUNTIME_SPI
+ pm_runtime_put(pspim->dev);
+ DBG_INF("pm_put");
+#endif
+ return ret;
+#ifdef CONFIG_PM_RUNTIME_SPI
+pm_out:
+ pm_runtime_mark_last_busy(pspim->dev);
+ pm_runtime_put_autosuspend(pspim->dev);
+ DBG_INF("pm_out");
+ return 0;
+#endif
+}
+
+static int pentagram_spi_controller_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ int ret;
+ int mode;
+ unsigned int max_freq;
+ struct spi_controller *ctlr;
+ struct pentagram_spi_master *pspim;
+
+ FUNC_DBG();
+
+ pdev->id = 0;
+ mode = SPI_MASTER;
+ if (pdev->dev.of_node) {
+ pdev->id = of_alias_get_id(pdev->dev.of_node, "sp_spi");
+ if (of_property_read_bool(pdev->dev.of_node, "spi-slave"))
+ mode = SPI_SLAVE;
+ }
+ dev_dbg(&pdev->dev, "pdev->id = %d\n", pdev->id);
+
+ if (mode == SPI_SLAVE)
+ ctlr = spi_alloc_slave(&pdev->dev, sizeof(*pspim));
+ else
+ ctlr = spi_alloc_master(&pdev->dev, sizeof(*pspim));
+ if (!ctlr)
+ return -ENOMEM;
+
+ ctlr->dev.of_node = pdev->dev.of_node;
+ ctlr->bus_num = pdev->id;
+ // flags, understood by the driver
+ ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
+ ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
+ ctlr->min_speed_hz = 40000;
+ ctlr->max_speed_hz = 50000000;
+ // ctlr->flags = 0
+ ctlr->max_transfer_size = pentagram_spi_max_length;
+ ctlr->max_message_size = pentagram_spi_max_length;
+ ctlr->setup = pentagram_spi_D_setup;
+ // FIXME: ctlr->auto_runtime_pm = true;
+ ctlr->prepare_message = pentagram_spi_controller_prepare_message;
+ ctlr->unprepare_message = pentagram_spi_controller_unprepare_message;
+
+ if (mode == SPI_SLAVE) {
+ ctlr->transfer_one = pentagram_spi_S_transfer_one;
+ ctlr->slave_abort = pentagram_spi_S_abort;
+ } else {
+ ctlr->use_gpio_descriptors = true;
+ ctlr->transfer_one_message = pentagram_spi_M_transfer_one_message;
+ }
+
+ platform_set_drvdata(pdev, ctlr);
+ pspim = spi_controller_get_devdata(ctlr);
+
+ pspim->ctlr = ctlr;
+ pspim->dev = &pdev->dev;
+ if (!of_property_read_u32(pdev->dev.of_node, "spi-max-frequency", &max_freq)) {
+ dev_dbg(&pdev->dev, "max_freq %d\n", max_freq);
+ pspim->spi_max_frequency = max_freq;
+ } else
+ pspim->spi_max_frequency = 25000000;
+
+ spin_lock_init(&pspim->lock);
+ mutex_init(&pspim->buf_lock);
+ init_completion(&pspim->isr_done);
+ init_completion(&pspim->sla_isr);
+
+ /* find and map our resources */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, MAS_REG_NAME);
+ if (res) {
+ pspim->mas_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(pspim->mas_base)) {
+ dev_err(&pdev->dev, "%s devm_ioremap_resource fail\n", MAS_REG_NAME);
+ goto free_alloc;
+ }
+ }
+ dev_dbg(&pdev->dev, "mas_base 0x%x\n", (unsigned int)pspim->mas_base);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, SLA_REG_NAME);
+ if (res) {
+ pspim->sla_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (IS_ERR(pspim->sla_base)) {
+ dev_err(&pdev->dev, "%s devm_ioremap_resource fail\n", SLA_REG_NAME);
+ goto free_alloc;
+ }
+ }
+ dev_dbg(&pdev->dev, "sla_base 0x%x\n", (unsigned int)pspim->sla_base);
+
+ /* irq*/
+ pspim->dma_irq = platform_get_irq_byname(pdev, DMA_IRQ_NAME);
+ if (pspim->dma_irq < 0) {
+ dev_err(&pdev->dev, "failed to get %s\n", DMA_IRQ_NAME);
+ goto free_alloc;
+ }
+
+ pspim->mas_irq = platform_get_irq_byname(pdev, MAS_IRQ_NAME);
+ if (pspim->mas_irq < 0) {
+ dev_err(&pdev->dev, "failed to get %s\n", MAS_IRQ_NAME);
+ goto free_alloc;
+ }
+
+
+ pspim->sla_irq = platform_get_irq_byname(pdev, SLA_IRQ_NAME);
+ if (pspim->sla_irq < 0) {
+ dev_err(&pdev->dev, "failed to get %s\n", SLA_IRQ_NAME);
+ goto free_alloc;
+ }
+
+ /* requset irq*/
+ ret = devm_request_irq(&pdev->dev, pspim->dma_irq, pentagram_spi_M_irq_dma
+ , IRQF_TRIGGER_RISING, pdev->name, pspim);
+ if (ret) {
+ dev_err(&pdev->dev, "%s devm_request_irq fail\n", DMA_IRQ_NAME);
+ goto free_alloc;
+ }
+
+ ret = devm_request_irq(&pdev->dev, pspim->mas_irq, pentagram_spi_M_irq
+ , IRQF_TRIGGER_RISING, pdev->name, pspim);
+ if (ret) {
+ dev_err(&pdev->dev, "%s devm_request_irq fail\n", MAS_IRQ_NAME);
+ goto free_alloc;
+ }
+
+
+ ret = devm_request_irq(&pdev->dev, pspim->sla_irq, pentagram_spi_S_irq
+ , IRQF_TRIGGER_RISING, pdev->name, pspim);
+ if (ret) {
+ dev_err(&pdev->dev, "%s devm_request_irq fail\n", SLA_IRQ_NAME);
+ goto free_alloc;
+ }
+
+ /* clk*/
+ pspim->spi_clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(pspim->spi_clk)) {
+ dev_err(&pdev->dev, "devm_clk_get fail\n");
+ goto free_alloc;
+ }
+ ret = clk_prepare_enable(pspim->spi_clk);
+ if (ret)
+ goto free_alloc;
+
+ /* reset*/
+ pspim->rstc = devm_reset_control_get(&pdev->dev, NULL);
+ dev_dbg(&pdev->dev, "pspim->rstc : 0x%x\n", (unsigned int)pspim->rstc);
+ if (IS_ERR(pspim->rstc)) {
+ ret = PTR_ERR(pspim->rstc);
+ dev_err(&pdev->dev, "SPI failed to retrieve reset controller: %d\n", ret);
+ goto free_clk;
+ }
+ ret = reset_control_deassert(pspim->rstc);
+ if (ret)
+ goto free_clk;
+
+ /* dma alloc*/
+ pspim->tx_dma_vir_base = dma_alloc_coherent(&pdev->dev, bufsiz,
+ &pspim->tx_dma_phy_base, GFP_ATOMIC);
+ if (!pspim->tx_dma_vir_base)
+ goto free_reset_assert;
+
+ dev_dbg(&pdev->dev, "tx_dma vir 0x%x\n", (unsigned int)pspim->tx_dma_vir_base);
+ dev_dbg(&pdev->dev, "tx_dma phy 0x%x\n", (unsigned int)pspim->tx_dma_phy_base);
+
+ pspim->rx_dma_vir_base = dma_alloc_coherent(&pdev->dev, bufsiz,
+ &pspim->rx_dma_phy_base, GFP_ATOMIC);
+ if (!pspim->rx_dma_vir_base)
+ goto free_tx_dma;
+
+ dev_dbg(&pdev->dev, "rx_dma vir 0x%x\n", (unsigned int)pspim->rx_dma_vir_base);
+ dev_dbg(&pdev->dev, "rx_dma phy 0x%x\n", (unsigned int)pspim->rx_dma_phy_base);
+
+ ret = devm_spi_register_controller(&pdev->dev, ctlr);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "spi_register_master fail\n");
+ goto free_rx_dma;
+ }
+
+#ifdef CONFIG_PM_RUNTIME_SPI
+ pm_runtime_set_autosuspend_delay(&pdev->dev, 5000);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+ dev_dbg(&pdev->dev, "pm init done\n");
+#endif
+ return 0;
+
+free_rx_dma:
+ dma_free_coherent(&pdev->dev, bufsiz, pspim->rx_dma_vir_base, pspim->rx_dma_phy_base);
+free_tx_dma:
+ dma_free_coherent(&pdev->dev, bufsiz, pspim->tx_dma_vir_base, pspim->tx_dma_phy_base);
+free_reset_assert:
+ reset_control_assert(pspim->rstc);
+free_clk:
+ clk_disable_unprepare(pspim->spi_clk);
+free_alloc:
+ spi_controller_put(ctlr);
+
+ dev_dbg(&pdev->dev, "spi_master_probe done\n");
+ return ret;
+}
+
+static int pentagram_spi_controller_remove(struct platform_device *pdev)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(master);
+
+ FUNC_DBG();
+
+#ifdef CONFIG_PM_RUNTIME_SPI
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
+#endif
+
+ dma_free_coherent(&pdev->dev, bufsiz, pspim->tx_dma_vir_base, pspim->tx_dma_phy_base);
+ dma_free_coherent(&pdev->dev, bufsiz, pspim->rx_dma_vir_base, pspim->rx_dma_phy_base);
+
+ spi_unregister_master(pspim->ctlr);
+ clk_disable_unprepare(pspim->spi_clk);
+ reset_control_assert(pspim->rstc);
+
+ return 0;
+}
+
+static int pentagram_spi_controller_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct spi_controller *ctlr = platform_get_drvdata(pdev);
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(ctlr);
+
+ FUNC_DBG();
+
+ reset_control_assert(pspim->rstc);
+
+ return 0;
+}
+
+static int pentagram_spi_controller_resume(struct platform_device *pdev)
+{
+ struct spi_controller *ctlr = platform_get_drvdata(pdev);
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(ctlr);
+
+ FUNC_DBG();
+
+ reset_control_deassert(pspim->rstc);
+ clk_prepare_enable(pspim->spi_clk);
+
+ return 0;
+}
+
+
+#ifdef CONFIG_PM_RUNTIME_SPI
+static int sp_spi_runtime_suspend(struct device *dev)
+{
+ struct spi_controller *ctlr = platform_get_drvdata(pdev);
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(ctlr);
+
+ dev_dbg(dev, "devid:%d\n", dev->id);
+ reset_control_assert(pspim->rstc);
+
+ return 0;
+}
+
+static int sp_spi_runtime_resume(struct device *dev)
+{
+ struct spi_controller *ctlr = platform_get_drvdata(pdev);
+ struct pentagram_spi_master *pspim = spi_master_get_devdata(ctlr);
+
+ dev_dbg(dev, "devid:%d\n", dev->id);
+ reset_control_deassert(pspim->rstc);
+ clk_prepare_enable(pspim->spi_clk);
+
+ return 0;
+}
+
+static const struct dev_pm_ops sp7021_spi_pm_ops = {
+ .runtime_suspend = sp_spi_runtime_suspend,
+ .runtime_resume = sp_spi_runtime_resume,
+};
+#endif
+
+static const struct of_device_id pentagram_spi_controller_ids[] = {
+ { .compatible = "sunplus,sp7021-spi-controller" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, pentagram_spi_controller_ids);
+
+static struct platform_driver pentagram_spi_controller_driver = {
+ .probe = pentagram_spi_controller_probe,
+ .remove = pentagram_spi_controller_remove,
+ .suspend = pentagram_spi_controller_suspend,
+ .resume = pentagram_spi_controller_resume,
+ .driver = {
+ .name = "sunplus,sp7021-spi-controller",
+ .of_match_table = pentagram_spi_controller_ids,
+#ifdef CONFIG_PM_RUNTIME_SPI
+ .pm = &sp7021_spi_pm_ops,
+#endif
+ },
+};
+module_platform_driver(pentagram_spi_controller_driver);
+
+MODULE_AUTHOR("lH Kuo <lh.kuo@...plus.com>");
+MODULE_DESCRIPTION("Sunplus SPI controller driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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