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u-boot/drivers/spi/bcmbca_hsspi.c
William Zhang 55c0144bd3 spi: bcmbca-hsspi: Add driver for newer HSSPI controller 
The newer BCMBCA SoCs such as BCM6756, BCM4912 and BCM6855 include an
updated SPI controller that add the capability to allow the driver to
control chip select explicitly. Driver can control and keep cs low
between the transfers natively. Hence the dummy cs workaround or prepend
mode found in the bcm63xx-hsspi driver are no longer needed and this new
driver is much cleaner.

Port from linux patch:
Link: https://lore.kernel.org/r/20230209200246.141520-15-william.zhang@broadcom.com
Signed-off-by: William Zhang <william.zhang@broadcom.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
2023-07-13 13:59:57 +05:30

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
*
* Derived from linux/drivers/spi/spi-bcm63xx-hsspi.c:
* Copyright (C) 2000-2010 Broadcom Corporation
* Copyright (C) 2012-2013 Jonas Gorski <jogo@openwrt.org>
* Copyright (C) 2021 Broadcom Ltd
*/
#include <common.h>
#include <asm/io.h>
#include <clk.h>
#include <spi.h>
#include <reset.h>
#include <wait_bit.h>
#include <dm.h>
#include <dm/device_compat.h>
#define HSSPI_PP 0
#define SPI_MAX_SYNC_CLOCK 30000000
/* SPI Control register */
#define SPI_CTL_REG 0x000
#define SPI_CTL_CS_POL_SHIFT 0
#define SPI_CTL_CS_POL_MASK (0xff << SPI_CTL_CS_POL_SHIFT)
#define SPI_CTL_CLK_GATE_SHIFT 16
#define SPI_CTL_CLK_GATE_MASK BIT(SPI_CTL_CLK_GATE_SHIFT)
#define SPI_CTL_CLK_POL_SHIFT 17
#define SPI_CTL_CLK_POL_MASK BIT(SPI_CTL_CLK_POL_SHIFT)
/* SPI Interrupts registers */
#define SPI_IR_STAT_REG 0x008
#define SPI_IR_ST_MASK_REG 0x00c
#define SPI_IR_MASK_REG 0x010
#define SPI_IR_CLEAR_ALL 0xff001f1f
/* SPI Ping-Pong Command registers */
#define SPI_CMD_REG (0x080 + (0x40 * (HSSPI_PP)) + 0x00)
#define SPI_CMD_OP_SHIFT 0
#define SPI_CMD_OP_START BIT(SPI_CMD_OP_SHIFT)
#define SPI_CMD_PFL_SHIFT 8
#define SPI_CMD_PFL_MASK (0x7 << SPI_CMD_PFL_SHIFT)
#define SPI_CMD_SLAVE_SHIFT 12
#define SPI_CMD_SLAVE_MASK (0x7 << SPI_CMD_SLAVE_SHIFT)
/* SPI Ping-Pong Status registers */
#define SPI_STAT_REG (0x080 + (0x40 * (HSSPI_PP)) + 0x04)
#define SPI_STAT_SRCBUSY_SHIFT 1
#define SPI_STAT_SRCBUSY_MASK BIT(SPI_STAT_SRCBUSY_SHIFT)
/* SPI Profile Clock registers */
#define SPI_PFL_CLK_REG(x) (0x100 + (0x20 * (x)) + 0x00)
#define SPI_PFL_CLK_FREQ_SHIFT 0
#define SPI_PFL_CLK_FREQ_MASK (0x3fff << SPI_PFL_CLK_FREQ_SHIFT)
#define SPI_PFL_CLK_RSTLOOP_SHIFT 15
#define SPI_PFL_CLK_RSTLOOP_MASK BIT(SPI_PFL_CLK_RSTLOOP_SHIFT)
/* SPI Profile Signal registers */
#define SPI_PFL_SIG_REG(x) (0x100 + (0x20 * (x)) + 0x04)
#define SPI_PFL_SIG_LATCHRIS_SHIFT 12
#define SPI_PFL_SIG_LATCHRIS_MASK BIT(SPI_PFL_SIG_LATCHRIS_SHIFT)
#define SPI_PFL_SIG_LAUNCHRIS_SHIFT 13
#define SPI_PFL_SIG_LAUNCHRIS_MASK BIT(SPI_PFL_SIG_LAUNCHRIS_SHIFT)
#define SPI_PFL_SIG_ASYNCIN_SHIFT 16
#define SPI_PFL_SIG_ASYNCIN_MASK BIT(SPI_PFL_SIG_ASYNCIN_SHIFT)
/* SPI Profile Mode registers */
#define SPI_PFL_MODE_REG(x) (0x100 + (0x20 * (x)) + 0x08)
#define SPI_PFL_MODE_FILL_SHIFT 0
#define SPI_PFL_MODE_FILL_MASK (0xff << SPI_PFL_MODE_FILL_SHIFT)
#define SPI_PFL_MODE_MDRDSZ_SHIFT 16
#define SPI_PFL_MODE_MDRDSZ_MASK BIT(SPI_PFL_MODE_MDRDSZ_SHIFT)
#define SPI_PFL_MODE_MDWRSZ_SHIFT 18
#define SPI_PFL_MODE_MDWRSZ_MASK BIT(SPI_PFL_MODE_MDWRSZ_SHIFT)
#define SPI_PFL_MODE_3WIRE_SHIFT 20
#define SPI_PFL_MODE_3WIRE_MASK BIT(SPI_PFL_MODE_3WIRE_SHIFT)
/* SPI Ping-Pong FIFO registers */
#define HSSPI_FIFO_SIZE 0x200
#define HSSPI_FIFO_BASE (0x200 + \
(HSSPI_FIFO_SIZE * HSSPI_PP))
/* SPI Ping-Pong FIFO OP register */
#define HSSPI_FIFO_OP_SIZE 0x2
#define HSSPI_FIFO_OP_REG (HSSPI_FIFO_BASE + 0x00)
#define HSSPI_FIFO_OP_BYTES_SHIFT 0
#define HSSPI_FIFO_OP_BYTES_MASK (0x3ff << HSSPI_FIFO_OP_BYTES_SHIFT)
#define HSSPI_FIFO_OP_MBIT_SHIFT 11
#define HSSPI_FIFO_OP_MBIT_MASK BIT(HSSPI_FIFO_OP_MBIT_SHIFT)
#define HSSPI_FIFO_OP_CODE_SHIFT 13
#define HSSPI_FIFO_OP_READ_WRITE (1 << HSSPI_FIFO_OP_CODE_SHIFT)
#define HSSPI_FIFO_OP_CODE_W (2 << HSSPI_FIFO_OP_CODE_SHIFT)
#define HSSPI_FIFO_OP_CODE_R (3 << HSSPI_FIFO_OP_CODE_SHIFT)
#define HSSPI_MAX_DATA_SIZE (HSSPI_FIFO_SIZE - HSSPI_FIFO_OP_SIZE)
#define SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT 0
#define SPIM_CTRL_CS_OVERRIDE_SEL_MASK 0xff
#define SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT 8
#define SPIM_CTRL_CS_OVERRIDE_VAL_MASK 0xff
struct bcmbca_hsspi_priv {
void __iomem *regs;
void __iomem *spim_ctrl;
u32 clk_rate;
u8 num_cs;
u8 cs_pols;
u32 speed;
};
static int bcmbca_hsspi_cs_info(struct udevice *bus, uint cs,
struct spi_cs_info *info)
{
struct bcmbca_hsspi_priv *priv = dev_get_priv(bus);
if (cs >= priv->num_cs) {
dev_err(bus, "no cs %u\n", cs);
return -EINVAL;
}
return 0;
}
static int bcmbca_hsspi_set_mode(struct udevice *bus, uint mode)
{
struct bcmbca_hsspi_priv *priv = dev_get_priv(bus);
/* clock polarity */
if (mode & SPI_CPOL)
setbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CLK_POL_MASK);
else
clrbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CLK_POL_MASK);
return 0;
}
static int bcmbca_hsspi_set_speed(struct udevice *bus, uint speed)
{
struct bcmbca_hsspi_priv *priv = dev_get_priv(bus);
priv->speed = speed;
return 0;
}
static void bcmbca_hsspi_setup_clock(struct bcmbca_hsspi_priv *priv,
struct dm_spi_slave_plat *plat)
{
u32 clr, set;
/* profile clock */
set = DIV_ROUND_UP(priv->clk_rate, priv->speed);
set = DIV_ROUND_UP(2048, set);
set &= SPI_PFL_CLK_FREQ_MASK;
set |= SPI_PFL_CLK_RSTLOOP_MASK;
writel(set, priv->regs + SPI_PFL_CLK_REG(plat->cs));
/* profile signal */
set = 0;
clr = SPI_PFL_SIG_LAUNCHRIS_MASK |
SPI_PFL_SIG_LATCHRIS_MASK |
SPI_PFL_SIG_ASYNCIN_MASK;
/* latch/launch config */
if (plat->mode & SPI_CPHA)
set |= SPI_PFL_SIG_LAUNCHRIS_MASK;
else
set |= SPI_PFL_SIG_LATCHRIS_MASK;
/* async clk */
if (priv->speed > SPI_MAX_SYNC_CLOCK)
set |= SPI_PFL_SIG_ASYNCIN_MASK;
clrsetbits_32(priv->regs + SPI_PFL_SIG_REG(plat->cs), clr, set);
/* global control */
set = 0;
clr = 0;
if (priv->cs_pols & BIT(plat->cs))
set |= BIT(plat->cs);
else
clr |= BIT(plat->cs);
clrsetbits_32(priv->regs + SPI_CTL_REG, clr, set);
}
static void bcmbca_hsspi_activate_cs(struct bcmbca_hsspi_priv *priv,
struct dm_spi_slave_plat *plat)
{
u32 val;
/* set the override bit */
val = readl(priv->spim_ctrl);
val |= BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
writel(val, priv->spim_ctrl);
}
static void bcmbca_hsspi_deactivate_cs(struct bcmbca_hsspi_priv *priv,
struct dm_spi_slave_plat *plat)
{
u32 val;
/* clear the cs override bit */
val = readl(priv->spim_ctrl);
val &= ~BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
writel(val, priv->spim_ctrl);
}
static int bcmbca_hsspi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
struct bcmbca_hsspi_priv *priv = dev_get_priv(dev->parent);
struct dm_spi_slave_plat *plat = dev_get_parent_plat(dev);
size_t data_bytes = bitlen / 8;
size_t step_size = HSSPI_FIFO_SIZE;
u16 opcode = 0;
u32 val = SPI_PFL_MODE_FILL_MASK;
const u8 *tx = dout;
u8 *rx = din;
u32 cs_act = 0;
if (flags & SPI_XFER_BEGIN)
bcmbca_hsspi_setup_clock(priv, plat);
/* fifo operation */
if (tx && rx)
opcode = HSSPI_FIFO_OP_READ_WRITE;
else if (rx)
opcode = HSSPI_FIFO_OP_CODE_R;
else if (tx)
opcode = HSSPI_FIFO_OP_CODE_W;
if (opcode != HSSPI_FIFO_OP_CODE_R)
step_size -= HSSPI_FIFO_OP_SIZE;
/* dual mode */
if ((opcode == HSSPI_FIFO_OP_CODE_R && (plat->mode & SPI_RX_DUAL)) ||
(opcode == HSSPI_FIFO_OP_CODE_W && (plat->mode & SPI_TX_DUAL))) {
opcode |= HSSPI_FIFO_OP_MBIT_MASK;
/* profile mode */
if (plat->mode & SPI_RX_DUAL)
val |= SPI_PFL_MODE_MDRDSZ_MASK;
if (plat->mode & SPI_TX_DUAL)
val |= SPI_PFL_MODE_MDWRSZ_MASK;
}
if (plat->mode & SPI_3WIRE)
val |= SPI_PFL_MODE_3WIRE_MASK;
writel(val, priv->regs + SPI_PFL_MODE_REG(plat->cs));
/* transfer loop */
while (data_bytes > 0) {
size_t curr_step = min(step_size, data_bytes);
int ret;
/* copy tx data */
if (tx) {
memcpy_toio(priv->regs + HSSPI_FIFO_BASE +
HSSPI_FIFO_OP_SIZE, tx, curr_step);
tx += curr_step;
}
/* set fifo operation */
writew(cpu_to_be16(opcode | (curr_step & HSSPI_FIFO_OP_BYTES_MASK)),
priv->regs + HSSPI_FIFO_OP_REG);
/* make sure we keep cs active until spi transfer is done */
if (!cs_act) {
bcmbca_hsspi_activate_cs(priv, plat);
cs_act = 1;
}
/* issue the transfer */
val = SPI_CMD_OP_START;
val |= (plat->cs << SPI_CMD_PFL_SHIFT) &
SPI_CMD_PFL_MASK;
val |= (plat->cs << SPI_CMD_SLAVE_SHIFT) &
SPI_CMD_SLAVE_MASK;
writel(val, priv->regs + SPI_CMD_REG);
/* wait for completion */
ret = wait_for_bit_32(priv->regs + SPI_STAT_REG,
SPI_STAT_SRCBUSY_MASK, false,
1000, false);
if (ret) {
bcmbca_hsspi_deactivate_cs(priv, plat);
dev_err(dev, "interrupt timeout\n");
return ret;
}
data_bytes -= curr_step;
if ((flags & SPI_XFER_END) && !data_bytes)
bcmbca_hsspi_deactivate_cs(priv, plat);
/* copy rx data */
if (rx) {
memcpy_fromio(rx, priv->regs + HSSPI_FIFO_BASE,
curr_step);
rx += curr_step;
}
}
return 0;
}
static const struct dm_spi_ops bcmbca_hsspi_ops = {
.cs_info = bcmbca_hsspi_cs_info,
.set_mode = bcmbca_hsspi_set_mode,
.set_speed = bcmbca_hsspi_set_speed,
.xfer = bcmbca_hsspi_xfer,
};
static const struct udevice_id bcmbca_hsspi_ids[] = {
{ .compatible = "brcm,bcmbca-hsspi-v1.1", },
{ /* sentinel */ }
};
static int bcmbca_hsspi_child_pre_probe(struct udevice *dev)
{
struct bcmbca_hsspi_priv *priv = dev_get_priv(dev->parent);
struct dm_spi_slave_plat *plat = dev_get_parent_plat(dev);
u32 val;
/* check cs */
if (plat->cs >= priv->num_cs) {
dev_err(dev, "no cs %u\n", plat->cs);
return -EINVAL;
}
/* cs polarity */
if (plat->mode & SPI_CS_HIGH)
priv->cs_pols |= BIT(plat->cs);
else
priv->cs_pols &= ~BIT(plat->cs);
/* set the polarity to spim cs register */
val = readl(priv->spim_ctrl);
val &= ~BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
if (priv->cs_pols & BIT(plat->cs))
val |= BIT(plat->cs + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
writel(val, priv->spim_ctrl);
return 0;
}
static int bcmbca_hsspi_probe(struct udevice *dev)
{
struct bcmbca_hsspi_priv *priv = dev_get_priv(dev);
struct clk clk;
int ret;
priv->regs = dev_remap_addr_name(dev, "hsspi");
if (!priv->regs)
return -EINVAL;
priv->spim_ctrl = dev_remap_addr_name(dev, "spim-ctrl");
if (!priv->spim_ctrl) {
dev_err(dev, "misc spim ctrl register not defined in dts!\n");
return -EINVAL;
}
priv->num_cs = dev_read_u32_default(dev, "num-cs", 8);
/* enable clock */
ret = clk_get_by_name(dev, "hsspi", &clk);
if (ret < 0)
return ret;
ret = clk_enable(&clk);
if (ret < 0 && ret != -ENOSYS)
return ret;
clk_free(&clk);
/* get clock rate */
ret = clk_get_by_name(dev, "pll", &clk);
if (ret < 0 && ret != -ENOSYS)
return ret;
priv->clk_rate = clk_get_rate(&clk);
clk_free(&clk);
/* initialize hardware */
writel(0, priv->regs + SPI_IR_MASK_REG);
/* clear pending interrupts */
writel(SPI_IR_CLEAR_ALL, priv->regs + SPI_IR_STAT_REG);
/* enable clk gate */
setbits_32(priv->regs + SPI_CTL_REG, SPI_CTL_CLK_GATE_MASK);
/* read default cs polarities */
priv->cs_pols = readl(priv->regs + SPI_CTL_REG) &
SPI_CTL_CS_POL_MASK;
dev_info(dev, "Broadcom BCMBCA HS SPI bus driver\n");
return 0;
}
U_BOOT_DRIVER(bcmbca_hsspi) = {
.name = "bcmbca_hsspi",
.id = UCLASS_SPI,
.of_match = bcmbca_hsspi_ids,
.ops = &bcmbca_hsspi_ops,
.priv_auto = sizeof(struct bcmbca_hsspi_priv),
.child_pre_probe = bcmbca_hsspi_child_pre_probe,
.probe = bcmbca_hsspi_probe,
};
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