u-boot/drivers/spi/mtk_snfi_spi.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 MediaTek Inc. All Rights Reserved.
*
* Author: Weijie Gao <weijie.gao@mediatek.com>
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <errno.h>
#include <spi.h>
#include <spi-mem.h>
#include <stdbool.h>
#include <watchdog.h>
#include <dm/pinctrl.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#define SNFI_MAC_CTL 0x500
#define MAC_XIO_SEL BIT(4)
#define SF_MAC_EN BIT(3)
#define SF_TRIG BIT(2)
#define WIP_READY BIT(1)
#define WIP BIT(0)
#define SNFI_MAC_OUTL 0x504
#define SNFI_MAC_INL 0x508
#define SNFI_MISC_CTL 0x538
#define SW_RST BIT(28)
#define FIFO_RD_LTC_SHIFT 25
#define FIFO_RD_LTC GENMASK(26, 25)
#define LATCH_LAT_SHIFT 8
#define LATCH_LAT GENMASK(9, 8)
#define CS_DESELECT_CYC_SHIFT 0
#define CS_DESELECT_CYC GENMASK(4, 0)
#define SNF_STA_CTL1 0x550
#define SPI_STATE GENMASK(3, 0)
#define SNFI_GPRAM_OFFSET 0x800
#define SNFI_GPRAM_SIZE 0x80
#define SNFI_POLL_INTERVAL 500000
#define SNFI_RST_POLL_INTERVAL 1000000
struct mtk_snfi_priv {
void __iomem *base;
struct clk nfi_clk;
struct clk pad_clk;
};
static int mtk_snfi_adjust_op_size(struct spi_slave *slave,
struct spi_mem_op *op)
{
u32 nbytes;
/*
* When there is input data, it will be appended after the output
* data in the GPRAM. So the total size of either pure output data
* or the output+input data must not exceed the GPRAM size.
*/
nbytes = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes;
if (nbytes + op->data.nbytes <= SNFI_GPRAM_SIZE)
return 0;
if (nbytes >= SNFI_GPRAM_SIZE)
return -ENOTSUPP;
op->data.nbytes = SNFI_GPRAM_SIZE - nbytes;
return 0;
}
static bool mtk_snfi_supports_op(struct spi_slave *slave,
const struct spi_mem_op *op)
{
if (op->cmd.buswidth > 1 || op->addr.buswidth > 1 ||
op->dummy.buswidth > 1 || op->data.buswidth > 1)
return false;
return true;
}
static int mtk_snfi_mac_trigger(struct mtk_snfi_priv *priv,
struct udevice *bus, u32 outlen, u32 inlen)
{
int ret;
u32 val;
#ifdef CONFIG_PINCTRL
pinctrl_select_state(bus, "snfi");
#endif
writel(SF_MAC_EN, priv->base + SNFI_MAC_CTL);
writel(outlen, priv->base + SNFI_MAC_OUTL);
writel(inlen, priv->base + SNFI_MAC_INL);
writel(SF_MAC_EN | SF_TRIG, priv->base + SNFI_MAC_CTL);
ret = readl_poll_timeout(priv->base + SNFI_MAC_CTL, val,
val & WIP_READY, SNFI_POLL_INTERVAL);
if (ret) {
printf("%s: timed out waiting for WIP_READY\n", __func__);
goto cleanup;
}
ret = readl_poll_timeout(priv->base + SNFI_MAC_CTL, val,
!(val & WIP), SNFI_POLL_INTERVAL);
if (ret)
printf("%s: timed out waiting for WIP cleared\n", __func__);
writel(0, priv->base + SNFI_MAC_CTL);
cleanup:
#ifdef CONFIG_PINCTRL
pinctrl_select_state(bus, "default");
#endif
return ret;
}
static int mtk_snfi_mac_reset(struct mtk_snfi_priv *priv)
{
int ret;
u32 val;
setbits_32(priv->base + SNFI_MISC_CTL, SW_RST);
ret = readl_poll_timeout(priv->base + SNF_STA_CTL1, val,
!(val & SPI_STATE), SNFI_POLL_INTERVAL);
if (ret)
printf("%s: failed to reset snfi mac\n", __func__);
writel((2 << FIFO_RD_LTC_SHIFT) |
(10 << CS_DESELECT_CYC_SHIFT),
priv->base + SNFI_MISC_CTL);
return ret;
}
static void mtk_snfi_copy_to_gpram(struct mtk_snfi_priv *priv,
const void *data, size_t len)
{
void __iomem *gpram = priv->base + SNFI_GPRAM_OFFSET;
size_t i, n = (len + sizeof(u32) - 1) / sizeof(u32);
const u32 *buff = data;
/*
* The output data will always be copied to the beginning of
* the GPRAM. Uses word write for better performance.
*
* Trailing bytes in the last word are not cared.
*/
for (i = 0; i < n; i++)
writel(buff[i], gpram + i * sizeof(u32));
}
static void mtk_snfi_copy_from_gpram(struct mtk_snfi_priv *priv, u8 *cache,
void *data, size_t pos, size_t len)
{
void __iomem *gpram = priv->base + SNFI_GPRAM_OFFSET;
u32 *buff = (u32 *)cache;
size_t i, off, end;
/* Start position in the buffer */
off = pos & (sizeof(u32) - 1);
/* End position for copy */
end = (len + pos + sizeof(u32) - 1) & (~(sizeof(u32) - 1));
/* Start position for copy */
pos &= ~(sizeof(u32) - 1);
/*
* Read aligned data from GPRAM to buffer first.
* Uses word read for better performance.
*/
i = 0;
while (pos < end) {
buff[i++] = readl(gpram + pos);
pos += sizeof(u32);
}
/* Copy rx data */
memcpy(data, cache + off, len);
}
static int mtk_snfi_exec_op(struct spi_slave *slave,
const struct spi_mem_op *op)
{
struct udevice *bus = dev_get_parent(slave->dev);
struct mtk_snfi_priv *priv = dev_get_priv(bus);
u8 gpram_cache[SNFI_GPRAM_SIZE];
u32 i, len = 0, inlen = 0;
int addr_sh;
int ret;
schedule();
ret = mtk_snfi_mac_reset(priv);
if (ret)
return ret;
/* Put opcode */
gpram_cache[len++] = op->cmd.opcode;
/* Put address */
addr_sh = (op->addr.nbytes - 1) * 8;
while (addr_sh >= 0) {
gpram_cache[len++] = (op->addr.val >> addr_sh) & 0xff;
addr_sh -= 8;
}
/* Put dummy bytes */
for (i = 0; i < op->dummy.nbytes; i++)
gpram_cache[len++] = 0;
/* Put output data */
if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT) {
memcpy(gpram_cache + len, op->data.buf.out, op->data.nbytes);
len += op->data.nbytes;
}
/* Copy final output data to GPRAM */
mtk_snfi_copy_to_gpram(priv, gpram_cache, len);
/* Start one SPI transaction */
if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_IN)
inlen = op->data.nbytes;
ret = mtk_snfi_mac_trigger(priv, bus, len, inlen);
if (ret)
return ret;
/* Copy input data from GPRAM */
if (inlen)
mtk_snfi_copy_from_gpram(priv, gpram_cache, op->data.buf.in,
len, inlen);
return 0;
}
static int mtk_snfi_spi_probe(struct udevice *bus)
{
struct mtk_snfi_priv *priv = dev_get_priv(bus);
int ret;
priv->base = dev_read_addr_ptr(bus);
if (!priv->base)
return -EINVAL;
ret = clk_get_by_name(bus, "nfi_clk", &priv->nfi_clk);
if (ret < 0)
return ret;
ret = clk_get_by_name(bus, "pad_clk", &priv->pad_clk);
if (ret < 0)
return ret;
clk_enable(&priv->nfi_clk);
clk_enable(&priv->pad_clk);
return 0;
}
static int mtk_snfi_set_speed(struct udevice *bus, uint speed)
{
/*
* The SNFI does not have a bus clock divider.
* The bus clock is set in dts (pad_clk, UNIVPLL2_D8 = 50MHz).
*/
return 0;
}
static int mtk_snfi_set_mode(struct udevice *bus, uint mode)
{
/* The SNFI supports only mode 0 */
if (mode)
return -EINVAL;
return 0;
}
static const struct spi_controller_mem_ops mtk_snfi_mem_ops = {
.adjust_op_size = mtk_snfi_adjust_op_size,
.supports_op = mtk_snfi_supports_op,
.exec_op = mtk_snfi_exec_op,
};
static const struct dm_spi_ops mtk_snfi_spi_ops = {
.mem_ops = &mtk_snfi_mem_ops,
.set_speed = mtk_snfi_set_speed,
.set_mode = mtk_snfi_set_mode,
};
static const struct udevice_id mtk_snfi_spi_ids[] = {
{ .compatible = "mediatek,mtk-snfi-spi" },
{ }
};
U_BOOT_DRIVER(mtk_snfi_spi) = {
.name = "mtk_snfi_spi",
.id = UCLASS_SPI,
.of_match = mtk_snfi_spi_ids,
.ops = &mtk_snfi_spi_ops,
.priv_auto = sizeof(struct mtk_snfi_priv),
.probe = mtk_snfi_spi_probe,
};