[PATCH v14 1/2] spi: Add Renesas R-Car Gen3 RPC-IF SPI controller driver
From: Mason Yang
Date: Thu Jun 20 2019 - 05:14:07 EST
Add a driver for Renesas R-Car Gen3 RPC-IF SPI controller.
Signed-off-by: Mason Yang <masonccyang@xxxxxxxxxxx>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
---
drivers/spi/Kconfig | 6 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-renesas-rpc.c | 760 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 767 insertions(+)
create mode 100644 drivers/spi/spi-renesas-rpc.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 30a4028..68a808b 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -571,6 +571,12 @@ config SPI_RSPI
help
SPI driver for Renesas RSPI and QSPI blocks.
+config SPI_RENESAS_RPC
+ tristate "Renesas R-Car Gen3 RPC-IF SPI controller"
+ depends on ARCH_RENESAS || COMPILE_TEST
+ help
+ SPI driver for Renesas R-Car Gen3 RPC-IF.
+
config SPI_QCOM_QSPI
tristate "QTI QSPI controller"
depends on ARCH_QCOM
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index f2f78d0..2a6e052 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -87,6 +87,7 @@ obj-$(CONFIG_SPI_QUP) += spi-qup.o
obj-$(CONFIG_SPI_ROCKCHIP) += spi-rockchip.o
obj-$(CONFIG_SPI_RB4XX) += spi-rb4xx.o
obj-$(CONFIG_SPI_RSPI) += spi-rspi.o
+obj-$(CONFIG_SPI_RENESAS_RPC) += spi-renesas-rpc.o
obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o
spi-s3c24xx-hw-y := spi-s3c24xx.o
spi-s3c24xx-hw-$(CONFIG_SPI_S3C24XX_FIQ) += spi-s3c24xx-fiq.o
diff --git a/drivers/spi/spi-renesas-rpc.c b/drivers/spi/spi-renesas-rpc.c
new file mode 100644
index 0000000..e0fe7b0
--- /dev/null
+++ b/drivers/spi/spi-renesas-rpc.c
@@ -0,0 +1,760 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2018 ~ 2019 Renesas Solutions Corp.
+// Copyright (C) 2019 Macronix International Co., Ltd.
+//
+// R-Car Gen3 RPC-IF SPI/QSPI/Octa driver
+//
+// Author:
+// Mason Yang <masonccyang@xxxxxxxxxxx>
+//
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/log2.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+
+#include <asm/unaligned.h>
+
+#define RPC_CMNCR 0x0000 // R/W
+#define RPC_CMNCR_MD BIT(31)
+#define RPC_CMNCR_SFDE BIT(24) // undocumented bit but must be set
+#define RPC_CMNCR_MOIIO3(val) (((val) & 0x3) << 22)
+#define RPC_CMNCR_MOIIO2(val) (((val) & 0x3) << 20)
+#define RPC_CMNCR_MOIIO1(val) (((val) & 0x3) << 18)
+#define RPC_CMNCR_MOIIO0(val) (((val) & 0x3) << 16)
+#define RPC_CMNCR_MOIIO_HIZ (RPC_CMNCR_MOIIO0(3) | RPC_CMNCR_MOIIO1(3) | \
+ RPC_CMNCR_MOIIO2(3) | RPC_CMNCR_MOIIO3(3))
+#define RPC_CMNCR_IO3FV(val) (((val) & 0x3) << 14) // undocumented
+#define RPC_CMNCR_IO2FV(val) (((val) & 0x3) << 12) // undocumented
+#define RPC_CMNCR_IO0FV(val) (((val) & 0x3) << 8)
+#define RPC_CMNCR_IOFV_HIZ (RPC_CMNCR_IO0FV(3) | RPC_CMNCR_IO2FV(3) | \
+ RPC_CMNCR_IO3FV(3))
+#define RPC_CMNCR_BSZ(val) (((val) & 0x3) << 0)
+
+#define RPC_SSLDR 0x0004 // R/W
+#define RPC_SSLDR_SPNDL(d) (((d) & 0x7) << 16)
+#define RPC_SSLDR_SLNDL(d) (((d) & 0x7) << 8)
+#define RPC_SSLDR_SCKDL(d) (((d) & 0x7) << 0)
+
+#define RPC_DRCR 0x000C // R/W
+#define RPC_DRCR_SSLN BIT(24)
+#define RPC_DRCR_RBURST(v) ((((v) - 1) & 0x1F) << 16)
+#define RPC_DRCR_RCF BIT(9)
+#define RPC_DRCR_RBE BIT(8)
+#define RPC_DRCR_SSLE BIT(0)
+
+#define RPC_DRCMR 0x0010 // R/W
+#define RPC_DRCMR_CMD(c) (((c) & 0xFF) << 16)
+#define RPC_DRCMR_OCMD(c) (((c) & 0xFF) << 0)
+
+#define RPC_DREAR 0x0014 // R/W
+#define RPC_DREAR_EAV(c) (((c) & 0xf) << 16)
+#define RPC_DREAR_EAC(c) (((c) & 0x7) << 0)
+
+#define RPC_DROPR 0x0018 // R/W
+
+#define RPC_DRENR 0x001C // R/W
+#define RPC_DRENR_CDB(o) (u32)((((o) & 0x3) << 30))
+#define RPC_DRENR_OCDB(o) (((o) & 0x3) << 28)
+#define RPC_DRENR_ADB(o) (((o) & 0x3) << 24)
+#define RPC_DRENR_OPDB(o) (((o) & 0x3) << 20)
+#define RPC_DRENR_DRDB(o) (((o) & 0x3) << 16)
+#define RPC_DRENR_DME BIT(15)
+#define RPC_DRENR_CDE BIT(14)
+#define RPC_DRENR_OCDE BIT(12)
+#define RPC_DRENR_ADE(v) (((v) & 0xF) << 8)
+#define RPC_DRENR_OPDE(v) (((v) & 0xF) << 4)
+
+#define RPC_SMCR 0x0020 // R/W
+#define RPC_SMCR_SSLKP BIT(8)
+#define RPC_SMCR_SPIRE BIT(2)
+#define RPC_SMCR_SPIWE BIT(1)
+#define RPC_SMCR_SPIE BIT(0)
+
+#define RPC_SMCMR 0x0024 // R/W
+#define RPC_SMCMR_CMD(c) (((c) & 0xFF) << 16)
+#define RPC_SMCMR_OCMD(c) (((c) & 0xFF) << 0)
+
+#define RPC_SMADR 0x0028 // R/W
+#define RPC_SMOPR 0x002C // R/W
+#define RPC_SMOPR_OPD3(o) (((o) & 0xFF) << 24)
+#define RPC_SMOPR_OPD2(o) (((o) & 0xFF) << 16)
+#define RPC_SMOPR_OPD1(o) (((o) & 0xFF) << 8)
+#define RPC_SMOPR_OPD0(o) (((o) & 0xFF) << 0)
+
+#define RPC_SMENR 0x0030 // R/W
+#define RPC_SMENR_CDB(o) (((o) & 0x3) << 30)
+#define RPC_SMENR_OCDB(o) (((o) & 0x3) << 28)
+#define RPC_SMENR_ADB(o) (((o) & 0x3) << 24)
+#define RPC_SMENR_OPDB(o) (((o) & 0x3) << 20)
+#define RPC_SMENR_SPIDB(o) (((o) & 0x3) << 16)
+#define RPC_SMENR_DME BIT(15)
+#define RPC_SMENR_CDE BIT(14)
+#define RPC_SMENR_OCDE BIT(12)
+#define RPC_SMENR_ADE(v) (((v) & 0xF) << 8)
+#define RPC_SMENR_OPDE(v) (((v) & 0xF) << 4)
+#define RPC_SMENR_SPIDE(v) (((v) & 0xF) << 0)
+
+#define RPC_SMRDR0 0x0038 // R
+#define RPC_SMRDR1 0x003C // R
+#define RPC_SMWDR0 0x0040 // W
+#define RPC_SMWDR1 0x0044 // W
+
+#define RPC_CMNSR 0x0048 // R
+#define RPC_CMNSR_SSLF BIT(1)
+#define RPC_CMNSR_TEND BIT(0)
+
+#define RPC_DRDMCR 0x0058 // R/W
+#define RPC_DRDRENR 0x005C // R/W
+
+#define RPC_SMDMCR 0x0060 // R/W
+#define RPC_SMDMCR_DMCYC(v) ((((v) - 1) & 0x1F) << 0)
+
+#define RPC_SMDRENR 0x0064 // R/W
+#define RPC_SMDRENR_HYPE (0x7 << 12)
+#define RPC_SMDRENR_ADDRE BIT(8)
+#define RPC_SMDRENR_OPDRE BIT(4)
+#define RPC_SMDRENR_SPIDRE BIT(0)
+
+#define RPC_PHYCNT 0x007C // R/W
+#define RPC_PHYCNT_CAL BIT(31)
+#define PRC_PHYCNT_OCTA_AA BIT(22)
+#define PRC_PHYCNT_OCTA_SA BIT(23)
+#define PRC_PHYCNT_EXDS BIT(21)
+#define RPC_PHYCNT_OCT BIT(20)
+#define RPC_PHYCNT_STRTIM(v) (((v) & 0x7) << 15)
+#define RPC_PHYCNT_WBUF2 BIT(4)
+#define RPC_PHYCNT_WBUF BIT(2)
+#define RPC_PHYCNT_PHYMEM(v) (((v) & 0x3) << 0)
+
+#define RPC_PHYOFFSET1 0x0080 // R/W
+#define RPC_PHYOFFSET1_DDRTMG(v) (((v) & 0x3) << 28)
+#define RPC_PHYOFFSET2 0x0084 // R/W
+#define RPC_PHYOFFSET2_OCTTMG(v) (((v) & 0x7) << 8)
+
+#define RPC_DIRMAP_SIZE 0x4000000
+
+struct rpc_spi {
+ struct device *dev;
+ struct clk *clk_rpc;
+ void __iomem *base;
+ void __iomem *dirmap;
+ struct regmap *regmap;
+ u32 cur_speed_hz;
+ u32 cmd;
+ u32 addr;
+ u32 dummy;
+ u32 smcr;
+ u32 smenr;
+ u32 xferlen;
+ u32 totalxferlen;
+ enum spi_mem_data_dir xfer_dir;
+ struct reset_control *rstc;
+};
+
+static int rpc_spi_set_freq(struct rpc_spi *rpc, unsigned long freq)
+{
+ int ret;
+
+ if (rpc->cur_speed_hz == freq)
+ return 0;
+
+ ret = clk_set_rate(rpc->clk_rpc, freq);
+ if (ret)
+ return ret;
+
+ rpc->cur_speed_hz = freq;
+ return ret;
+}
+
+static void rpc_spi_hw_init(struct rpc_spi *rpc)
+{
+ //
+ // NOTE: The 0x260 are undocumented bits, but they must be set.
+ // RPC_PHYCNT_STRTIM is strobe timing adjustment bit,
+ // 0x0 : the delay is biggest,
+ // 0x1 : the delay is 2nd biggest,
+ // On H3 ES1.x, the value should be 0, while on others,
+ // the value should be 6.
+ //
+ regmap_write(rpc->regmap, RPC_PHYCNT, RPC_PHYCNT_CAL |
+ RPC_PHYCNT_STRTIM(6) | 0x260);
+
+ //
+ // NOTE: The 0x1511144 are undocumented bits, but they must be set
+ // for RPC_PHYOFFSET1.
+ // The 0x31 are undocumented bits, but they must be set
+ // for RPC_PHYOFFSET2.
+ //
+ regmap_write(rpc->regmap, RPC_PHYOFFSET1, RPC_PHYOFFSET1_DDRTMG(3) |
+ 0x1511144);
+ regmap_write(rpc->regmap, RPC_PHYOFFSET2, 0x31 |
+ RPC_PHYOFFSET2_OCTTMG(4));
+ regmap_write(rpc->regmap, RPC_SSLDR, RPC_SSLDR_SPNDL(7) |
+ RPC_SSLDR_SLNDL(7) | RPC_SSLDR_SCKDL(7));
+ regmap_write(rpc->regmap, RPC_CMNCR, RPC_CMNCR_MD | RPC_CMNCR_SFDE |
+ RPC_CMNCR_MOIIO_HIZ | RPC_CMNCR_IOFV_HIZ |
+ RPC_CMNCR_BSZ(0));
+}
+
+static int wait_msg_xfer_end(struct rpc_spi *rpc)
+{
+ u32 sts;
+
+ return regmap_read_poll_timeout(rpc->regmap, RPC_CMNSR, sts,
+ sts & RPC_CMNSR_TEND, 0, USEC_PER_SEC);
+}
+
+static u8 rpc_bits_set(u32 nbytes)
+{
+ nbytes = clamp(nbytes, 1U, 4U);
+
+ return GENMASK(3, 4 - nbytes);
+}
+
+static int rpc_spi_io_xfer(struct rpc_spi *rpc,
+ const void *tx_buf, void *rx_buf)
+{
+ u32 smenr, smcr, data, pos = 0;
+ int ret;
+
+ pm_runtime_get_sync(rpc->dev);
+ regmap_update_bits(rpc->regmap, RPC_CMNCR, RPC_CMNCR_MD, RPC_CMNCR_MD);
+ regmap_write(rpc->regmap, RPC_SMDRENR, 0);
+ regmap_write(rpc->regmap, RPC_SMCMR, rpc->cmd);
+ regmap_write(rpc->regmap, RPC_SMDMCR, rpc->dummy);
+ regmap_write(rpc->regmap, RPC_SMADR, rpc->addr);
+ smenr = rpc->smenr;
+
+ if (tx_buf) {
+ while (pos < rpc->xferlen) {
+ u32 nbytes = rpc->xferlen - pos;
+
+ regmap_write(rpc->regmap, RPC_SMWDR0,
+ get_unaligned((u32 *)(tx_buf + pos)));
+
+ smcr = rpc->smcr | RPC_SMCR_SPIE;
+
+ if (nbytes > 4) {
+ nbytes = 4;
+ smcr |= RPC_SMCR_SSLKP;
+ }
+
+ regmap_write(rpc->regmap, RPC_SMENR, smenr);
+ regmap_write(rpc->regmap, RPC_SMCR, smcr);
+ ret = wait_msg_xfer_end(rpc);
+ if (ret)
+ goto err_out;
+
+ pos += nbytes;
+ smenr = rpc->smenr & ~RPC_SMENR_CDE &
+ ~RPC_SMENR_ADE(0xf);
+ }
+ } else if (rx_buf) {
+ //
+ // RPC-IF spoils the data for the commands without an address
+ // phase (like RDID) in the manual mode, so we'll have to work
+ // around this issue by using the external address space read
+ // mode instead.
+ //
+ if (!(smenr & RPC_SMENR_ADE(0xf)) && rpc->dirmap) {
+ regmap_update_bits(rpc->regmap, RPC_CMNCR,
+ RPC_CMNCR_MD, 0);
+ regmap_write(rpc->regmap, RPC_DRCR,
+ RPC_DRCR_RBURST(32) | RPC_DRCR_RBE);
+ regmap_write(rpc->regmap, RPC_DREAR, RPC_DREAR_EAC(1));
+ regmap_write(rpc->regmap, RPC_DRCMR, rpc->cmd);
+ regmap_write(rpc->regmap, RPC_DRDMCR, rpc->dummy);
+ regmap_write(rpc->regmap, RPC_DROPR, 0);
+ regmap_write(rpc->regmap, RPC_DRENR, smenr);
+ memcpy_fromio(rx_buf, rpc->dirmap, rpc->xferlen);
+ regmap_write(rpc->regmap, RPC_DRCR, RPC_DRCR_RCF);
+ } else {
+ while (pos < rpc->xferlen) {
+ u32 nbytes = rpc->xferlen - pos;
+
+ if (nbytes > 4)
+ nbytes = 4;
+
+ regmap_write(rpc->regmap, RPC_SMENR, smenr);
+ regmap_write(rpc->regmap, RPC_SMCR, rpc->smcr |
+ RPC_SMCR_SPIE);
+ ret = wait_msg_xfer_end(rpc);
+ if (ret)
+ goto err_out;
+
+ regmap_read(rpc->regmap, RPC_SMRDR0, &data);
+ memcpy(rx_buf + pos, &data, nbytes);
+ pos += nbytes;
+
+ regmap_write(rpc->regmap, RPC_SMADR,
+ rpc->addr + pos);
+ }
+ }
+ } else {
+ regmap_write(rpc->regmap, RPC_SMENR, rpc->smenr);
+ regmap_write(rpc->regmap, RPC_SMCR, rpc->smcr | RPC_SMCR_SPIE);
+ ret = wait_msg_xfer_end(rpc);
+ if (ret)
+ goto err_out;
+ }
+
+ pm_runtime_put(rpc->dev);
+ return 0;
+
+err_out:
+ pm_runtime_put(rpc->dev);
+ return reset_control_reset(rpc->rstc);
+}
+
+static void rpc_spi_mem_set_prep_op_cfg(struct spi_device *spi,
+ const struct spi_mem_op *op,
+ u64 *offs, size_t *len)
+{
+ struct rpc_spi *rpc = spi_controller_get_devdata(spi->controller);
+
+ rpc->cmd = RPC_SMCMR_CMD(op->cmd.opcode);
+ rpc->smenr = RPC_SMENR_CDE |
+ RPC_SMENR_CDB(ilog2(op->cmd.buswidth));
+ rpc->totalxferlen = 1;
+ rpc->xfer_dir = SPI_MEM_NO_DATA;
+ rpc->xferlen = 0;
+ rpc->addr = 0;
+
+ if (op->addr.nbytes) {
+ rpc->smenr |= RPC_SMENR_ADB(ilog2(op->addr.buswidth));
+ if (op->addr.nbytes == 4)
+ rpc->smenr |= RPC_SMENR_ADE(0xf);
+ else
+ rpc->smenr |= RPC_SMENR_ADE(0x7);
+
+ if (offs && len)
+ rpc->addr = *offs;
+ else
+ rpc->addr = op->addr.val;
+ rpc->totalxferlen += op->addr.nbytes;
+ }
+
+ if (op->dummy.nbytes) {
+ rpc->smenr |= RPC_SMENR_DME;
+ rpc->dummy = RPC_SMDMCR_DMCYC(op->dummy.nbytes * 8 /
+ op->dummy.buswidth);
+ rpc->totalxferlen += op->dummy.nbytes;
+ }
+
+ if (op->data.nbytes || (offs && len)) {
+ switch (op->data.dir) {
+ case SPI_MEM_DATA_IN:
+ rpc->smcr = RPC_SMCR_SPIRE;
+ rpc->xfer_dir = SPI_MEM_DATA_IN;
+ break;
+ case SPI_MEM_DATA_OUT:
+ rpc->smcr = RPC_SMCR_SPIWE;
+ rpc->xfer_dir = SPI_MEM_DATA_OUT;
+ break;
+ default:
+ break;
+ }
+
+ if (offs && len) {
+ rpc->smenr |= RPC_SMENR_SPIDE(rpc_bits_set(*len)) |
+ RPC_SMENR_SPIDB(ilog2(op->data.buswidth));
+ rpc->xferlen = *len;
+ rpc->totalxferlen += *len;
+ } else {
+ rpc->smenr |=
+ RPC_SMENR_SPIDE(rpc_bits_set(op->data.nbytes)) |
+ RPC_SMENR_SPIDB(ilog2(op->data.buswidth));
+ rpc->xferlen = op->data.nbytes;
+ rpc->totalxferlen += op->data.nbytes;
+ }
+ }
+}
+
+static bool rpc_spi_mem_supports_op(struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ if (op->data.buswidth > 4 || op->addr.buswidth > 4 ||
+ op->dummy.buswidth > 4 || op->cmd.buswidth > 4 ||
+ op->addr.nbytes > 4)
+ return false;
+
+ return true;
+}
+
+static ssize_t rpc_spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc,
+ u64 offs, size_t len, void *buf)
+{
+ struct rpc_spi *rpc =
+ spi_controller_get_devdata(desc->mem->spi->controller);
+ loff_t from = offs & (RPC_DIRMAP_SIZE - 1);
+ size_t size = RPC_DIRMAP_SIZE - from;
+ int ret;
+
+ if (offs + desc->info.offset + len > U32_MAX)
+ return -EINVAL;
+
+ if (len > size)
+ len = size;
+
+ ret = rpc_spi_set_freq(rpc, desc->mem->spi->max_speed_hz);
+ if (ret)
+ return ret;
+
+ pm_runtime_get_sync(rpc->dev);
+ rpc_spi_mem_set_prep_op_cfg(desc->mem->spi,
+ &desc->info.op_tmpl, &offs, &len);
+
+ regmap_update_bits(rpc->regmap, RPC_CMNCR, RPC_CMNCR_MD, 0);
+ regmap_write(rpc->regmap, RPC_DRCR, RPC_DRCR_RBURST(32) |
+ RPC_DRCR_RBE);
+
+ regmap_write(rpc->regmap, RPC_DRCMR, rpc->cmd);
+ regmap_write(rpc->regmap, RPC_DREAR,
+ RPC_DREAR_EAV(offs >> 25) | RPC_DREAR_EAC(1));
+ regmap_write(rpc->regmap, RPC_DROPR, 0);
+ regmap_write(rpc->regmap, RPC_DRENR, rpc->smenr);
+ regmap_write(rpc->regmap, RPC_DRDMCR, rpc->dummy);
+ regmap_write(rpc->regmap, RPC_DRDRENR, 0);
+
+ memcpy_fromio(buf, rpc->dirmap + desc->info.offset + from, len);
+
+ pm_runtime_put(rpc->dev);
+ return len;
+}
+
+static int rpc_spi_mem_dirmap_create(struct spi_mem_dirmap_desc *desc)
+{
+ struct rpc_spi *rpc =
+ spi_controller_get_devdata(desc->mem->spi->controller);
+
+ if (desc->info.offset + desc->info.length > U32_MAX)
+ return -ENOTSUPP;
+
+ if (!rpc_spi_mem_supports_op(desc->mem, &desc->info.op_tmpl))
+ return -ENOTSUPP;
+
+ if (!rpc->dirmap &&
+ desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN)
+ return -ENOTSUPP;
+
+ if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT)
+ return -ENOTSUPP;
+
+ return 0;
+}
+
+static int rpc_spi_mem_exec_op(struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ struct rpc_spi *rpc = spi_controller_get_devdata(mem->spi->controller);
+ int ret;
+
+ ret = rpc_spi_set_freq(rpc, mem->spi->max_speed_hz);
+ if (ret)
+ return ret;
+
+ rpc_spi_mem_set_prep_op_cfg(mem->spi, op, NULL, NULL);
+
+ ret = rpc_spi_io_xfer(rpc,
+ op->data.dir == SPI_MEM_DATA_OUT ?
+ op->data.buf.out : NULL,
+ op->data.dir == SPI_MEM_DATA_IN ?
+ op->data.buf.in : NULL);
+
+ return ret;
+}
+
+static const struct spi_controller_mem_ops rpc_spi_mem_ops = {
+ .supports_op = rpc_spi_mem_supports_op,
+ .exec_op = rpc_spi_mem_exec_op,
+ .dirmap_create = rpc_spi_mem_dirmap_create,
+ .dirmap_read = rpc_spi_mem_dirmap_read,
+};
+
+static void rpc_spi_transfer_setup(struct rpc_spi *rpc,
+ struct spi_message *msg)
+{
+ struct spi_transfer *t, xfer[4] = { };
+ u32 i, xfercnt, xferpos = 0;
+
+ rpc->totalxferlen = 0;
+ rpc->xfer_dir = SPI_MEM_NO_DATA;
+
+ list_for_each_entry(t, &msg->transfers, transfer_list) {
+ if (t->tx_buf) {
+ xfer[xferpos].tx_buf = t->tx_buf;
+ xfer[xferpos].tx_nbits = t->tx_nbits;
+ }
+
+ if (t->rx_buf) {
+ xfer[xferpos].rx_buf = t->rx_buf;
+ xfer[xferpos].rx_nbits = t->rx_nbits;
+ }
+
+ if (t->len) {
+ xfer[xferpos++].len = t->len;
+ rpc->totalxferlen += t->len;
+ }
+
+ if (list_is_last(&t->transfer_list, &msg->transfers)) {
+ if (xferpos > 1) {
+ if (t->rx_buf) {
+ rpc->xfer_dir = SPI_MEM_DATA_IN;
+ rpc->smcr = RPC_SMCR_SPIRE;
+ } else if (t->tx_buf) {
+ rpc->xfer_dir = SPI_MEM_DATA_OUT;
+ rpc->smcr = RPC_SMCR_SPIWE;
+ }
+ }
+ }
+ }
+
+ xfercnt = xferpos;
+ rpc->xferlen = xfer[--xferpos].len;
+ rpc->cmd = RPC_SMCMR_CMD(((u8 *)xfer[0].tx_buf)[0]);
+ rpc->smenr = RPC_SMENR_CDE |
+ RPC_SMENR_CDB(ilog2((unsigned int)xfer[0].tx_nbits));
+ rpc->addr = 0;
+
+ if (xfercnt > 2 && xfer[1].len && xfer[1].tx_buf) {
+ rpc->smenr |=
+ RPC_SMENR_ADB(ilog2((unsigned int)xfer[1].tx_nbits));
+
+ for (i = 0; i < xfer[1].len; i++)
+ rpc->addr |= ((u8 *)xfer[1].tx_buf)[i] <<
+ (8 * (xfer[1].len - i - 1));
+
+ if (xfer[1].len == 4)
+ rpc->smenr |= RPC_SMENR_ADE(0xf);
+ else
+ rpc->smenr |= RPC_SMENR_ADE(0x7);
+ }
+
+ if (xfercnt > 3 && xfer[2].len && xfer[2].tx_buf) {
+ rpc->smenr |= RPC_SMENR_DME;
+ rpc->dummy = RPC_SMDMCR_DMCYC(xfer[2].len * 8 /
+ xfer[2].tx_nbits);
+ }
+
+ for (i = xfercnt - 1; i < xfercnt && xfercnt > 1; i++) {
+ if (xfer[i].rx_buf) {
+ rpc->smenr |=
+ RPC_SMENR_SPIDE(rpc_bits_set(xfer[i].len)) |
+ RPC_SMENR_SPIDB(ilog2
+ ((unsigned int)xfer[i].rx_nbits));
+ } else if (xfer[i].tx_buf) {
+ rpc->smenr |=
+ RPC_SMENR_SPIDE(rpc_bits_set(xfer[i].len)) |
+ RPC_SMENR_SPIDB(ilog2
+ ((unsigned int)xfer[i].tx_nbits));
+ }
+ }
+}
+
+static inline int rpc_spi_xfer_message(struct rpc_spi *rpc,
+ struct spi_transfer *data_xfer)
+{
+ int ret;
+
+ ret = rpc_spi_set_freq(rpc, data_xfer->speed_hz);
+ if (ret)
+ return ret;
+
+ ret = rpc_spi_io_xfer(rpc,
+ rpc->xfer_dir == SPI_MEM_DATA_OUT ?
+ data_xfer->tx_buf : NULL,
+ rpc->xfer_dir == SPI_MEM_DATA_IN ?
+ data_xfer->rx_buf : NULL);
+
+ return ret;
+}
+
+static int rpc_spi_transfer_one_message(struct spi_controller *ctlr,
+ struct spi_message *msg)
+{
+ struct rpc_spi *rpc = spi_controller_get_devdata(ctlr);
+ struct spi_transfer *data_xfer;
+ int ret;
+
+ rpc_spi_transfer_setup(rpc, msg);
+
+ data_xfer = list_last_entry(&msg->transfers, struct spi_transfer,
+ transfer_list);
+
+ ret = rpc_spi_xfer_message(rpc, data_xfer);
+ if (ret)
+ goto out;
+
+ msg->status = 0;
+ msg->actual_length = rpc->totalxferlen;
+out:
+ spi_finalize_current_message(ctlr);
+ return 0;
+}
+
+static const struct regmap_range rpc_spi_volatile_ranges[] = {
+ regmap_reg_range(RPC_SMRDR0, RPC_SMRDR0),
+ regmap_reg_range(RPC_SMWDR0, RPC_SMWDR0),
+ regmap_reg_range(RPC_CMNSR, RPC_CMNSR),
+};
+
+static const struct regmap_access_table rpc_spi_volatile_table = {
+ .yes_ranges = rpc_spi_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(rpc_spi_volatile_ranges),
+};
+
+static const struct regmap_config rpc_spi_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .fast_io = true,
+ .max_register = RPC_PHYOFFSET2,
+ .volatile_table = &rpc_spi_volatile_table,
+};
+
+static int rpc_spi_probe(struct platform_device *pdev)
+{
+ struct spi_controller *ctlr;
+ struct resource *res;
+ struct rpc_spi *rpc;
+ struct device_node *flash;
+ int ret;
+
+ flash = of_get_next_child(pdev->dev.of_node, NULL);
+ if (!flash) {
+ dev_warn(&pdev->dev, "no flash node found\n");
+ return -ENODEV;
+ }
+
+ ret = of_device_is_compatible(flash, "jedec,spi-nor");
+ if (!ret) {
+ dev_warn(&pdev->dev, "no spi-nor device found\n");
+ return -ENODEV;
+ }
+
+ ctlr = spi_alloc_master(&pdev->dev, sizeof(*rpc));
+ if (!ctlr)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, ctlr);
+
+ rpc = spi_controller_get_devdata(ctlr);
+ rpc->dev = &pdev->dev;
+ ctlr->dev.of_node = pdev->dev.of_node;
+
+ rpc->clk_rpc = devm_clk_get(&pdev->dev, "rpc");
+ if (IS_ERR(rpc->clk_rpc))
+ return PTR_ERR(rpc->clk_rpc);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+ rpc->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(rpc->base))
+ return PTR_ERR(rpc->base);
+
+ rpc->regmap = devm_regmap_init_mmio(&pdev->dev, rpc->base,
+ &rpc_spi_regmap_config);
+ if (IS_ERR(rpc->regmap)) {
+ dev_err(&pdev->dev,
+ "failed to init regmap for rpc-spi, error %ld\n",
+ PTR_ERR(rpc->regmap));
+ return PTR_ERR(rpc->regmap);
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dirmap");
+ rpc->dirmap = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(rpc->dirmap))
+ rpc->dirmap = NULL;
+
+ rpc->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(rpc->rstc))
+ return PTR_ERR(rpc->rstc);
+
+ pm_runtime_enable(rpc->dev);
+ ctlr->auto_runtime_pm = true;
+
+ ctlr->num_chipselect = 1;
+ ctlr->mem_ops = &rpc_spi_mem_ops;
+ ctlr->transfer_one_message = rpc_spi_transfer_one_message;
+
+ ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
+ ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_QUAD | SPI_RX_QUAD;
+
+ pm_runtime_get_sync(rpc->dev);
+ rpc_spi_hw_init(rpc);
+ pm_runtime_put(rpc->dev);
+
+ ret = spi_register_controller(ctlr);
+ if (ret) {
+ dev_err(&pdev->dev, "spi_register_controller failed\n");
+ goto err_put_ctlr;
+ }
+ return 0;
+
+err_put_ctlr:
+ spi_controller_put(ctlr);
+ pm_runtime_disable(rpc->dev);
+
+ return ret;
+}
+
+static int rpc_spi_remove(struct platform_device *pdev)
+{
+ struct spi_controller *ctlr = platform_get_drvdata(pdev);
+
+ pm_runtime_disable(&pdev->dev);
+ spi_unregister_controller(ctlr);
+
+ return 0;
+}
+
+static const struct of_device_id rpc_spi_of_ids[] = {
+ { .compatible = "renesas,rcar-gen3-rpc", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rpc_spi_of_ids);
+
+#ifdef CONFIG_PM_SLEEP
+static int rpc_spi_suspend(struct device *dev)
+{
+ struct spi_controller *ctlr = dev_get_drvdata(dev);
+
+ return spi_controller_suspend(ctlr);
+}
+
+static int rpc_spi_resume(struct device *dev)
+{
+ struct spi_controller *ctlr = dev_get_drvdata(dev);
+
+ return spi_controller_resume(ctlr);
+}
+
+static SIMPLE_DEV_PM_OPS(rpc_spi_pm_ops, rpc_spi_suspend, rpc_spi_resume);
+#define DEV_PM_OPS (&rpc_spi_pm_ops)
+#else
+#define DEV_PM_OPS NULL
+#endif
+
+static struct platform_driver rpc_spi_driver = {
+ .probe = rpc_spi_probe,
+ .remove = rpc_spi_remove,
+ .driver = {
+ .name = "rpc-spi",
+ .of_match_table = rpc_spi_of_ids,
+ .pm = DEV_PM_OPS,
+ },
+};
+module_platform_driver(rpc_spi_driver);
+
+MODULE_AUTHOR("Mason Yang <masonccyang@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Renesas R-Car Gen3 RPC-IF SPI controller driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1