[RESEND PATCH v1 1/2] spi: add support for Amlogic A1 SPI Flash Controller
Igor Prusov
ivprusov at salutedevices.com
Thu Oct 19 17:33:06 CEST 2023
On Tue, Oct 17, 2023 at 09:33:02PM -0600, Simon Glass wrote:
> Hi Igor,
>
> On Tue, 17 Oct 2023 at 11:18, Igor Prusov <ivprusov at salutedevices.com> wrote:
> >
> > From: Igor Prusov <IVPrusov at sberdevices.ru>
> >
> > Add A1 SPIFC driver from Linux. Slightly modified to use u-boot driver
> > framework and accommodate to lack of ioread32_rep/iowrite32_rep.
>
> Well, you could bring them in!
>
> >
> > Based on Linux version 6.6-rc4
> >
> > Signed-off-by: Igor Prusov <IVPrusov at sberdevices.ru>
> > Signed-off-by: Martin Kurbanov <mmkurbanov at sberdevices.ru>
> > ---
> > drivers/spi/Kconfig | 8 +
> > drivers/spi/Makefile | 1 +
> > drivers/spi/meson_spifc_a1.c | 384 +++++++++++++++++++++++++++++++++++
> > 3 files changed, 393 insertions(+)
> > create mode 100644 drivers/spi/meson_spifc_a1.c
>
> Reviewed-by: Simon Glass <sjg at chromium.org>
>
> nits below
>
> >
> > diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> > index 854b8b88da..dedb366370 100644
> > --- a/drivers/spi/Kconfig
> > +++ b/drivers/spi/Kconfig
> > @@ -251,6 +251,14 @@ config MICROCHIP_COREQSPI
> > Enable the QSPI driver for Microchip FPGA QSPI controllers.
> > This driver can be used on Polarfire SoC.
> >
> > +config MESON_SPIFC_A1
> > + bool "Amlogic Meson A1 SPI Flash Controller driver"
> > + depends on ARCH_MESON
> > + help
> > + Enable the Amlogic A1 SPI Flash Controller (SPIFC) driver.
> > + This driver can be used to access the SPI NOR/NAND flash chips on
> > + Amlogic A1 SoC.
>
> What speeds does and modes it support? Can you add a little more detail?
>
Sure, will add in v2.
> > +
> > config MPC8XX_SPI
> > bool "MPC8XX SPI Driver"
> > depends on MPC8xx
> > diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> > index c27b3327c3..14bdb97f18 100644
> > --- a/drivers/spi/Makefile
> > +++ b/drivers/spi/Makefile
> > @@ -41,6 +41,7 @@ obj-$(CONFIG_ICH_SPI) += ich.o
> > obj-$(CONFIG_IPROC_QSPI) += iproc_qspi.o
> > obj-$(CONFIG_KIRKWOOD_SPI) += kirkwood_spi.o
> > obj-$(CONFIG_MESON_SPIFC) += meson_spifc.o
> > +obj-$(CONFIG_MESON_SPIFC_A1) += meson_spifc_a1.o
> > obj-$(CONFIG_MICROCHIP_COREQSPI) += microchip_coreqspi.o
> > obj-$(CONFIG_MPC8XX_SPI) += mpc8xx_spi.o
> > obj-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o
> > diff --git a/drivers/spi/meson_spifc_a1.c b/drivers/spi/meson_spifc_a1.c
> > new file mode 100644
> > index 0000000000..4b840c4634
> > --- /dev/null
> > +++ b/drivers/spi/meson_spifc_a1.c
> > @@ -0,0 +1,384 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Driver for Amlogic A1 SPI flash controller (SPIFC)
> > + *
> > + * Copyright (c) 2023, SberDevices. All Rights Reserved.
> > + *
> > + * Author: Martin Kurbanov <mmkurbanov at sberdevices.ru>
> > + *
> > + * Ported to u-boot:
> > + * Author: Igor Prusov <ivprusov at sberdevices.ru>
> > + */
> > +
> > +#include <common.h>
> > +#include <clk.h>
> > +#include <dm.h>
> > +#include <spi.h>
> > +#include <spi-mem.h>
> > +#include <asm/io.h>
> > +#include <linux/log2.h>
> > +#include <linux/iopoll.h>
> > +#include <linux/bitfield.h>
> > +
> > +#define SPIFC_A1_AHB_CTRL_REG 0x0
> > +#define SPIFC_A1_AHB_BUS_EN BIT(31)
> > +
> > +#define SPIFC_A1_USER_CTRL0_REG 0x200
> > +#define SPIFC_A1_USER_REQUEST_ENABLE BIT(31)
> > +#define SPIFC_A1_USER_REQUEST_FINISH BIT(30)
> > +#define SPIFC_A1_USER_DATA_UPDATED BIT(0)
> > +
> > +#define SPIFC_A1_USER_CTRL1_REG 0x204
> > +#define SPIFC_A1_USER_CMD_ENABLE BIT(30)
> > +#define SPIFC_A1_USER_CMD_MODE GENMASK(29, 28)
> > +#define SPIFC_A1_USER_CMD_CODE GENMASK(27, 20)
> > +#define SPIFC_A1_USER_ADDR_ENABLE BIT(19)
> > +#define SPIFC_A1_USER_ADDR_MODE GENMASK(18, 17)
> > +#define SPIFC_A1_USER_ADDR_BYTES GENMASK(16, 15)
> > +#define SPIFC_A1_USER_DOUT_ENABLE BIT(14)
> > +#define SPIFC_A1_USER_DOUT_MODE GENMASK(11, 10)
> > +#define SPIFC_A1_USER_DOUT_BYTES GENMASK(9, 0)
> > +
> > +#define SPIFC_A1_USER_CTRL2_REG 0x208
> > +#define SPIFC_A1_USER_DUMMY_ENABLE BIT(31)
> > +#define SPIFC_A1_USER_DUMMY_MODE GENMASK(30, 29)
> > +#define SPIFC_A1_USER_DUMMY_CLK_SYCLES GENMASK(28, 23)
> > +
> > +#define SPIFC_A1_USER_CTRL3_REG 0x20c
> > +#define SPIFC_A1_USER_DIN_ENABLE BIT(31)
> > +#define SPIFC_A1_USER_DIN_MODE GENMASK(28, 27)
> > +#define SPIFC_A1_USER_DIN_BYTES GENMASK(25, 16)
> > +
> > +#define SPIFC_A1_USER_ADDR_REG 0x210
> > +
> > +#define SPIFC_A1_AHB_REQ_CTRL_REG 0x214
> > +#define SPIFC_A1_AHB_REQ_ENABLE BIT(31)
> > +
> > +#define SPIFC_A1_ACTIMING0_REG (0x0088 << 2)
> > +#define SPIFC_A1_TSLCH GENMASK(31, 30)
> > +#define SPIFC_A1_TCLSH GENMASK(29, 28)
> > +#define SPIFC_A1_TSHWL GENMASK(20, 16)
> > +#define SPIFC_A1_TSHSL2 GENMASK(15, 12)
> > +#define SPIFC_A1_TSHSL1 GENMASK(11, 8)
> > +#define SPIFC_A1_TWHSL GENMASK(7, 0)
> > +
> > +#define SPIFC_A1_DBUF_CTRL_REG 0x240
> > +#define SPIFC_A1_DBUF_DIR BIT(31)
> > +#define SPIFC_A1_DBUF_AUTO_UPDATE_ADDR BIT(30)
> > +#define SPIFC_A1_DBUF_ADDR GENMASK(7, 0)
> > +
> > +#define SPIFC_A1_DBUF_DATA_REG 0x244
> > +
> > +#define SPIFC_A1_USER_DBUF_ADDR_REG 0x248
> > +
> > +#define SPIFC_A1_BUFFER_SIZE 512U
> > +
> > +#define SPIFC_A1_MAX_HZ 200000000
> > +#define SPIFC_A1_MIN_HZ 1000000
> > +
> > +#define SPIFC_A1_USER_CMD(op) ( \
> > + SPIFC_A1_USER_CMD_ENABLE | \
> > + FIELD_PREP(SPIFC_A1_USER_CMD_CODE, (op)->cmd.opcode) | \
> > + FIELD_PREP(SPIFC_A1_USER_CMD_MODE, ilog2((op)->cmd.buswidth)))
> > +
> > +#define SPIFC_A1_USER_ADDR(op) ( \
> > + SPIFC_A1_USER_ADDR_ENABLE | \
> > + FIELD_PREP(SPIFC_A1_USER_ADDR_MODE, ilog2((op)->addr.buswidth)) | \
> > + FIELD_PREP(SPIFC_A1_USER_ADDR_BYTES, (op)->addr.nbytes - 1))
> > +
> > +#define SPIFC_A1_USER_DUMMY(op) ( \
> > + SPIFC_A1_USER_DUMMY_ENABLE | \
> > + FIELD_PREP(SPIFC_A1_USER_DUMMY_MODE, ilog2((op)->dummy.buswidth)) | \
> > + FIELD_PREP(SPIFC_A1_USER_DUMMY_CLK_SYCLES, (op)->dummy.nbytes << 3))
> > +
> > +#define SPIFC_A1_TSLCH_VAL FIELD_PREP(SPIFC_A1_TSLCH, 1)
> > +#define SPIFC_A1_TCLSH_VAL FIELD_PREP(SPIFC_A1_TCLSH, 1)
> > +#define SPIFC_A1_TSHWL_VAL FIELD_PREP(SPIFC_A1_TSHWL, 7)
> > +#define SPIFC_A1_TSHSL2_VAL FIELD_PREP(SPIFC_A1_TSHSL2, 7)
> > +#define SPIFC_A1_TSHSL1_VAL FIELD_PREP(SPIFC_A1_TSHSL1, 7)
> > +#define SPIFC_A1_TWHSL_VAL FIELD_PREP(SPIFC_A1_TWHSL, 2)
> > +#define SPIFC_A1_ACTIMING0_VAL (SPIFC_A1_TSLCH_VAL | SPIFC_A1_TCLSH_VAL | \
> > + SPIFC_A1_TSHWL_VAL | SPIFC_A1_TSHSL2_VAL | \
> > + SPIFC_A1_TSHSL1_VAL | SPIFC_A1_TWHSL_VAL)
> > +
> > +struct amlogic_spifc_a1 {
> > + struct spi_controller *ctrl;
> > + struct clk clk;
> > + struct device *dev;
>
> Can you drop that? Normally we pass 'dev' to a function if needed,
> rather than passing 'priv' and looking up dev from there. In fact I am
> not sure this is used?
Yep, it's not used anywhere. It is also only accessed in Linux driver's
probe(), so it can be replaced with a stack variable there as well. Also
I've noticed that ctrl field is not used here as well, so I'm going to
drop it in v2 as well.
> > + void __iomem *base;
> > + u32 curr_speed_hz;
> > +};
> > +
> > +static int amlogic_spifc_a1_request(struct amlogic_spifc_a1 *spifc, bool read)
> > +{
> > + u32 mask = SPIFC_A1_USER_REQUEST_FINISH |
> > + (read ? SPIFC_A1_USER_DATA_UPDATED : 0);
> > + u32 val;
> > +
> > + writel(SPIFC_A1_USER_REQUEST_ENABLE,
> > + spifc->base + SPIFC_A1_USER_CTRL0_REG);
> > +
> > + return readl_poll_timeout(spifc->base + SPIFC_A1_USER_CTRL0_REG,
> > + val, (val & mask) == mask,
> > + 200 * 1000);
> > +}
> > +
> > +static void amlogic_spifc_a1_drain_buffer(struct amlogic_spifc_a1 *spifc,
> > + char *buf, u32 len)
> > +{
> > + u32 data;
> > + const u32 count = len / sizeof(data);
> > + const u32 pad = len % sizeof(data);
> > +
> > + writel(SPIFC_A1_DBUF_AUTO_UPDATE_ADDR,
> > + spifc->base + SPIFC_A1_DBUF_CTRL_REG);
> > + readsl(spifc->base + SPIFC_A1_DBUF_DATA_REG, buf, count);
> > +
> > + if (pad) {
> > + data = readl(spifc->base + SPIFC_A1_DBUF_DATA_REG);
> > + memcpy(buf + len - pad, &data, pad);
> > + }
> > +}
> > +
> > +static void amlogic_spifc_a1_fill_buffer(struct amlogic_spifc_a1 *spifc,
> > + const char *buf, u32 len)
> > +{
> > + u32 data;
> > + const u32 count = len / sizeof(data);
> > + const u32 pad = len % sizeof(data);
> > +
> > + writel(SPIFC_A1_DBUF_DIR | SPIFC_A1_DBUF_AUTO_UPDATE_ADDR,
> > + spifc->base + SPIFC_A1_DBUF_CTRL_REG);
> > + writesl(spifc->base + SPIFC_A1_DBUF_DATA_REG, buf, count);
> > +
> > + if (pad) {
> > + memcpy(&data, buf + len - pad, pad);
> > + writel(data, spifc->base + SPIFC_A1_DBUF_DATA_REG);
> > + }
> > +}
> > +
> > +static void amlogic_spifc_a1_user_init(struct amlogic_spifc_a1 *spifc)
> > +{
> > + writel(0, spifc->base + SPIFC_A1_USER_CTRL0_REG);
> > + writel(0, spifc->base + SPIFC_A1_USER_CTRL1_REG);
> > + writel(0, spifc->base + SPIFC_A1_USER_CTRL2_REG);
> > + writel(0, spifc->base + SPIFC_A1_USER_CTRL3_REG);
> > +}
> > +
> > +static void amlogic_spifc_a1_set_cmd(struct amlogic_spifc_a1 *spifc,
> > + u32 cmd_cfg)
> > +{
> > + u32 val;
> > +
> > + val = readl(spifc->base + SPIFC_A1_USER_CTRL1_REG);
> > + val &= ~(SPIFC_A1_USER_CMD_MODE | SPIFC_A1_USER_CMD_CODE);
> > + val |= cmd_cfg;
> > + writel(val, spifc->base + SPIFC_A1_USER_CTRL1_REG);
>
> You probably want to keep the code the same as Linux, but I'll just
> mention clrsetbits_le32() is case it is useful elsewhere.
>
Thanks, will keep in mind!
> > +}
> > +
> > +static void amlogic_spifc_a1_set_addr(struct amlogic_spifc_a1 *spifc, u32 addr,
> > + u32 addr_cfg)
> > +{
> > + u32 val;
> > +
> > + writel(addr, spifc->base + SPIFC_A1_USER_ADDR_REG);
> > +
> > + val = readl(spifc->base + SPIFC_A1_USER_CTRL1_REG);
> > + val &= ~(SPIFC_A1_USER_ADDR_MODE | SPIFC_A1_USER_ADDR_BYTES);
> > + val |= addr_cfg;
> > + writel(val, spifc->base + SPIFC_A1_USER_CTRL1_REG);
> > +}
> > +
> > +static void amlogic_spifc_a1_set_dummy(struct amlogic_spifc_a1 *spifc,
> > + u32 dummy_cfg)
> > +{
> > + u32 val = readl(spifc->base + SPIFC_A1_USER_CTRL2_REG);
> > +
> > + val &= ~(SPIFC_A1_USER_DUMMY_MODE | SPIFC_A1_USER_DUMMY_CLK_SYCLES);
> > + val |= dummy_cfg;
> > + writel(val, spifc->base + SPIFC_A1_USER_CTRL2_REG);
> > +}
> > +
> > +static int amlogic_spifc_a1_read(struct amlogic_spifc_a1 *spifc, void *buf,
> > + u32 size, u32 mode)
> > +{
> > + u32 val = readl(spifc->base + SPIFC_A1_USER_CTRL3_REG);
> > + int ret;
> > +
> > + val &= ~(SPIFC_A1_USER_DIN_MODE | SPIFC_A1_USER_DIN_BYTES);
> > + val |= SPIFC_A1_USER_DIN_ENABLE;
> > + val |= FIELD_PREP(SPIFC_A1_USER_DIN_MODE, mode);
> > + val |= FIELD_PREP(SPIFC_A1_USER_DIN_BYTES, size);
> > + writel(val, spifc->base + SPIFC_A1_USER_CTRL3_REG);
> > +
> > + ret = amlogic_spifc_a1_request(spifc, true);
> > + if (!ret)
> > + amlogic_spifc_a1_drain_buffer(spifc, buf, size);
> > +
> > + return ret;
> > +}
> > +
> > +static int amlogic_spifc_a1_write(struct amlogic_spifc_a1 *spifc,
> > + const void *buf, u32 size, u32 mode)
> > +{
> > + u32 val;
> > +
> > + amlogic_spifc_a1_fill_buffer(spifc, buf, size);
> > +
> > + val = readl(spifc->base + SPIFC_A1_USER_CTRL1_REG);
> > + val &= ~(SPIFC_A1_USER_DOUT_MODE | SPIFC_A1_USER_DOUT_BYTES);
> > + val |= FIELD_PREP(SPIFC_A1_USER_DOUT_MODE, mode);
> > + val |= FIELD_PREP(SPIFC_A1_USER_DOUT_BYTES, size);
> > + val |= SPIFC_A1_USER_DOUT_ENABLE;
> > + writel(val, spifc->base + SPIFC_A1_USER_CTRL1_REG);
> > +
> > + return amlogic_spifc_a1_request(spifc, false);
> > +}
> > +
> > +static int amlogic_spifc_a1_set_freq(struct amlogic_spifc_a1 *spifc, u32 freq)
> > +{
> > + int ret;
> > +
> > + if (freq == spifc->curr_speed_hz)
> > + return 0;
> > +
> > + ret = clk_set_rate(&spifc->clk, freq);
> > + if (ret)
> > + return ret;
> > +
> > + spifc->curr_speed_hz = freq;
> > + return 0;
> > +}
> > +
> > +static int amlogic_spifc_a1_exec_op(struct spi_slave *slave,
> > + const struct spi_mem_op *op)
> > +{
> > + struct amlogic_spifc_a1 *spifc = dev_get_priv(slave->dev->parent);
> > + size_t data_size = op->data.nbytes;
> > + int ret;
> > +
> > + ret = amlogic_spifc_a1_set_freq(spifc, slave->max_hz);
> > + if (ret)
> > + return ret;
> > +
> > + amlogic_spifc_a1_user_init(spifc);
> > + amlogic_spifc_a1_set_cmd(spifc, SPIFC_A1_USER_CMD(op));
> > +
> > + if (op->addr.nbytes)
> > + amlogic_spifc_a1_set_addr(spifc, op->addr.val,
> > + SPIFC_A1_USER_ADDR(op));
> > +
> > + if (op->dummy.nbytes)
> > + amlogic_spifc_a1_set_dummy(spifc, SPIFC_A1_USER_DUMMY(op));
> > +
> > + if (data_size) {
> > + u32 mode = ilog2(op->data.buswidth);
> > +
> > + writel(0, spifc->base + SPIFC_A1_USER_DBUF_ADDR_REG);
> > +
> > + if (op->data.dir == SPI_MEM_DATA_IN)
> > + ret = amlogic_spifc_a1_read(spifc, op->data.buf.in,
> > + data_size, mode);
> > + else
> > + ret = amlogic_spifc_a1_write(spifc, op->data.buf.out,
> > + data_size, mode);
> > + } else {
> > + ret = amlogic_spifc_a1_request(spifc, false);
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int amlogic_spifc_a1_adjust_op_size(struct spi_slave *slave,
> > + struct spi_mem_op *op)
> > +{
> > + op->data.nbytes = min(op->data.nbytes, SPIFC_A1_BUFFER_SIZE);
> > + return 0;
> > +}
> > +
> > +static void amlogic_spifc_a1_hw_init(struct amlogic_spifc_a1 *spifc)
> > +{
> > + u32 regv;
> > +
> > + regv = readl(spifc->base + SPIFC_A1_AHB_REQ_CTRL_REG);
> > + regv &= ~(SPIFC_A1_AHB_REQ_ENABLE);
>
> It is strange seeing these brackets here.
>
Indeed, though it is copied from Linux, so not sure if I should remove
them here.
> > + writel(regv, spifc->base + SPIFC_A1_AHB_REQ_CTRL_REG);
> > +
> > + regv = readl(spifc->base + SPIFC_A1_AHB_CTRL_REG);
> > + regv &= ~(SPIFC_A1_AHB_BUS_EN);
> > + writel(regv, spifc->base + SPIFC_A1_AHB_CTRL_REG);
> > +
> > + writel(SPIFC_A1_ACTIMING0_VAL, spifc->base + SPIFC_A1_ACTIMING0_REG);
> > +
> > + writel(0, spifc->base + SPIFC_A1_USER_DBUF_ADDR_REG);
> > +}
> > +
> > +static const struct spi_controller_mem_ops amlogic_spifc_a1_mem_ops = {
> > + .exec_op = amlogic_spifc_a1_exec_op,
> > + .adjust_op_size = amlogic_spifc_a1_adjust_op_size,
> > +};
> > +
> > +static int amlogic_spifc_a1_probe(struct udevice *dev)
> > +{
> > + struct amlogic_spifc_a1 *spifc = dev_get_priv(dev);
> > + int ret;
> > + struct udevice *bus = dev;
> > +
> > + spifc->base = (void *)dev_read_addr(dev);
>
> dev_read_addr_ptr()
>
> Also please check for NULL and return -EINVAL in that case
>
Will fix in v2, thanks!
> > +
> > + ret = clk_get_by_index(bus, 0, &spifc->clk);
> > + if (ret) {
> > + pr_err("can't get clk spifc_gate!\n");
> > + return ret;
> > + }
> > +
> > + ret = clk_enable(&spifc->clk);
> > + if (ret) {
> > + pr_err("enable clk fail\n");
> > + return ret;
> > + }
> > +
> > + amlogic_spifc_a1_hw_init(spifc);
> > +
> > + return 0;
> > +}
> > +
> > +static int amlogic_spifc_a1_remove(struct udevice *dev)
> > +{
> > + struct amlogic_spifc_a1 *spifc = dev_get_priv(dev);
> > +
> > + clk_free(&spifc->clk);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct udevice_id meson_spifc_ids[] = {
> > + { .compatible = "amlogic,a1-spifc", },
> > + { }
> > +};
> > +
> > +int amlogic_spifc_a1_set_speed(struct udevice *bus, uint hz)
> > +{
> > + return 0;
> > +}
> > +
> > +int amlogic_spifc_a1_set_mode(struct udevice *bus, uint mode)
> > +{
> > + return 0;
> > +}
> > +
> > +static const struct dm_spi_ops amlogic_spifc_a1_ops = {
> > + .mem_ops = &amlogic_spifc_a1_mem_ops,
> > + .set_speed = amlogic_spifc_a1_set_speed,
> > + .set_mode = amlogic_spifc_a1_set_mode,
> > +};
> > +
> > +U_BOOT_DRIVER(meson_spifc_a1) = {
> > + .name = "meson_spifc_a1",
> > + .id = UCLASS_SPI,
> > + .of_match = meson_spifc_ids,
> > + .ops = &amlogic_spifc_a1_ops,
> > + .probe = amlogic_spifc_a1_probe,
> > + .remove = amlogic_spifc_a1_remove,
> > + .priv_auto = sizeof(struct amlogic_spifc_a1),
> > +};
> > --
> > 2.34.1
> >
>
> Regards,
> Simon
--
Best Regards,
Igor Prusov
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