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linux/drivers/spi/spi-mxic.c
Lukas Wunner cc53711b21
spi: mxic: Don't leak SPI master in probe error path 
If the calls to devm_clk_get() or devm_ioremap_resource() fail on probe
of the Macronix SPI driver, the spi_master struct is erroneously not freed.

Fix by switching over to the new devm_spi_alloc_master() helper.

Fixes: b942d80b0a ("spi: Add MXIC controller driver")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: <stable@vger.kernel.org> # v5.0+: 5e844cc37a: spi: Introduce device-managed SPI controller allocation
Cc: <stable@vger.kernel.org> # v5.0+
Cc: Mason Yang <masonccyang@mxic.com.tw>
Link: https://lore.kernel.org/r/4fa6857806e7e75741c05d057ac9df3564460114.1607286887.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>
2020-12-07 14:18:52 +00:00

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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2018 Macronix International Co., Ltd.
//
// Authors:
// Mason Yang <masonccyang@mxic.com.tw>
// zhengxunli <zhengxunli@mxic.com.tw>
// Boris Brezillon <boris.brezillon@bootlin.com>
//
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi-mem.h>
#define HC_CFG 0x0
#define HC_CFG_IF_CFG(x) ((x) << 27)
#define HC_CFG_DUAL_SLAVE BIT(31)
#define HC_CFG_INDIVIDUAL BIT(30)
#define HC_CFG_NIO(x) (((x) / 4) << 27)
#define HC_CFG_TYPE(s, t) ((t) << (23 + ((s) * 2)))
#define HC_CFG_TYPE_SPI_NOR 0
#define HC_CFG_TYPE_SPI_NAND 1
#define HC_CFG_TYPE_SPI_RAM 2
#define HC_CFG_TYPE_RAW_NAND 3
#define HC_CFG_SLV_ACT(x) ((x) << 21)
#define HC_CFG_CLK_PH_EN BIT(20)
#define HC_CFG_CLK_POL_INV BIT(19)
#define HC_CFG_BIG_ENDIAN BIT(18)
#define HC_CFG_DATA_PASS BIT(17)
#define HC_CFG_IDLE_SIO_LVL(x) ((x) << 16)
#define HC_CFG_MAN_START_EN BIT(3)
#define HC_CFG_MAN_START BIT(2)
#define HC_CFG_MAN_CS_EN BIT(1)
#define HC_CFG_MAN_CS_ASSERT BIT(0)
#define INT_STS 0x4
#define INT_STS_EN 0x8
#define INT_SIG_EN 0xc
#define INT_STS_ALL GENMASK(31, 0)
#define INT_RDY_PIN BIT(26)
#define INT_RDY_SR BIT(25)
#define INT_LNR_SUSP BIT(24)
#define INT_ECC_ERR BIT(17)
#define INT_CRC_ERR BIT(16)
#define INT_LWR_DIS BIT(12)
#define INT_LRD_DIS BIT(11)
#define INT_SDMA_INT BIT(10)
#define INT_DMA_FINISH BIT(9)
#define INT_RX_NOT_FULL BIT(3)
#define INT_RX_NOT_EMPTY BIT(2)
#define INT_TX_NOT_FULL BIT(1)
#define INT_TX_EMPTY BIT(0)
#define HC_EN 0x10
#define HC_EN_BIT BIT(0)
#define TXD(x) (0x14 + ((x) * 4))
#define RXD 0x24
#define SS_CTRL(s) (0x30 + ((s) * 4))
#define LRD_CFG 0x44
#define LWR_CFG 0x80
#define RWW_CFG 0x70
#define OP_READ BIT(23)
#define OP_DUMMY_CYC(x) ((x) << 17)
#define OP_ADDR_BYTES(x) ((x) << 14)
#define OP_CMD_BYTES(x) (((x) - 1) << 13)
#define OP_OCTA_CRC_EN BIT(12)
#define OP_DQS_EN BIT(11)
#define OP_ENHC_EN BIT(10)
#define OP_PREAMBLE_EN BIT(9)
#define OP_DATA_DDR BIT(8)
#define OP_DATA_BUSW(x) ((x) << 6)
#define OP_ADDR_DDR BIT(5)
#define OP_ADDR_BUSW(x) ((x) << 3)
#define OP_CMD_DDR BIT(2)
#define OP_CMD_BUSW(x) (x)
#define OP_BUSW_1 0
#define OP_BUSW_2 1
#define OP_BUSW_4 2
#define OP_BUSW_8 3
#define OCTA_CRC 0x38
#define OCTA_CRC_IN_EN(s) BIT(3 + ((s) * 16))
#define OCTA_CRC_CHUNK(s, x) ((fls((x) / 32)) << (1 + ((s) * 16)))
#define OCTA_CRC_OUT_EN(s) BIT(0 + ((s) * 16))
#define ONFI_DIN_CNT(s) (0x3c + (s))
#define LRD_CTRL 0x48
#define RWW_CTRL 0x74
#define LWR_CTRL 0x84
#define LMODE_EN BIT(31)
#define LMODE_SLV_ACT(x) ((x) << 21)
#define LMODE_CMD1(x) ((x) << 8)
#define LMODE_CMD0(x) (x)
#define LRD_ADDR 0x4c
#define LWR_ADDR 0x88
#define LRD_RANGE 0x50
#define LWR_RANGE 0x8c
#define AXI_SLV_ADDR 0x54
#define DMAC_RD_CFG 0x58
#define DMAC_WR_CFG 0x94
#define DMAC_CFG_PERIPH_EN BIT(31)
#define DMAC_CFG_ALLFLUSH_EN BIT(30)
#define DMAC_CFG_LASTFLUSH_EN BIT(29)
#define DMAC_CFG_QE(x) (((x) + 1) << 16)
#define DMAC_CFG_BURST_LEN(x) (((x) + 1) << 12)
#define DMAC_CFG_BURST_SZ(x) ((x) << 8)
#define DMAC_CFG_DIR_READ BIT(1)
#define DMAC_CFG_START BIT(0)
#define DMAC_RD_CNT 0x5c
#define DMAC_WR_CNT 0x98
#define SDMA_ADDR 0x60
#define DMAM_CFG 0x64
#define DMAM_CFG_START BIT(31)
#define DMAM_CFG_CONT BIT(30)
#define DMAM_CFG_SDMA_GAP(x) (fls((x) / 8192) << 2)
#define DMAM_CFG_DIR_READ BIT(1)
#define DMAM_CFG_EN BIT(0)
#define DMAM_CNT 0x68
#define LNR_TIMER_TH 0x6c
#define RDM_CFG0 0x78
#define RDM_CFG0_POLY(x) (x)
#define RDM_CFG1 0x7c
#define RDM_CFG1_RDM_EN BIT(31)
#define RDM_CFG1_SEED(x) (x)
#define LWR_SUSP_CTRL 0x90
#define LWR_SUSP_CTRL_EN BIT(31)
#define DMAS_CTRL 0x9c
#define DMAS_CTRL_EN BIT(31)
#define DMAS_CTRL_DIR_READ BIT(30)
#define DATA_STROB 0xa0
#define DATA_STROB_EDO_EN BIT(2)
#define DATA_STROB_INV_POL BIT(1)
#define DATA_STROB_DELAY_2CYC BIT(0)
#define IDLY_CODE(x) (0xa4 + ((x) * 4))
#define IDLY_CODE_VAL(x, v) ((v) << (((x) % 4) * 8))
#define GPIO 0xc4
#define GPIO_PT(x) BIT(3 + ((x) * 16))
#define GPIO_RESET(x) BIT(2 + ((x) * 16))
#define GPIO_HOLDB(x) BIT(1 + ((x) * 16))
#define GPIO_WPB(x) BIT((x) * 16)
#define HC_VER 0xd0
#define HW_TEST(x) (0xe0 + ((x) * 4))
struct mxic_spi {
struct clk *ps_clk;
struct clk *send_clk;
struct clk *send_dly_clk;
void __iomem *regs;
u32 cur_speed_hz;
};
static int mxic_spi_clk_enable(struct mxic_spi *mxic)
{
int ret;
ret = clk_prepare_enable(mxic->send_clk);
if (ret)
return ret;
ret = clk_prepare_enable(mxic->send_dly_clk);
if (ret)
goto err_send_dly_clk;
return ret;
err_send_dly_clk:
clk_disable_unprepare(mxic->send_clk);
return ret;
}
static void mxic_spi_clk_disable(struct mxic_spi *mxic)
{
clk_disable_unprepare(mxic->send_clk);
clk_disable_unprepare(mxic->send_dly_clk);
}
static void mxic_spi_set_input_delay_dqs(struct mxic_spi *mxic, u8 idly_code)
{
writel(IDLY_CODE_VAL(0, idly_code) |
IDLY_CODE_VAL(1, idly_code) |
IDLY_CODE_VAL(2, idly_code) |
IDLY_CODE_VAL(3, idly_code),
mxic->regs + IDLY_CODE(0));
writel(IDLY_CODE_VAL(4, idly_code) |
IDLY_CODE_VAL(5, idly_code) |
IDLY_CODE_VAL(6, idly_code) |
IDLY_CODE_VAL(7, idly_code),
mxic->regs + IDLY_CODE(1));
}
static int mxic_spi_clk_setup(struct mxic_spi *mxic, unsigned long freq)
{
int ret;
ret = clk_set_rate(mxic->send_clk, freq);
if (ret)
return ret;
ret = clk_set_rate(mxic->send_dly_clk, freq);
if (ret)
return ret;
/*
* A constant delay range from 0x0 ~ 0x1F for input delay,
* the unit is 78 ps, the max input delay is 2.418 ns.
*/
mxic_spi_set_input_delay_dqs(mxic, 0xf);
/*
* Phase degree = 360 * freq * output-delay
* where output-delay is a constant value 1 ns in FPGA.
*
* Get Phase degree = 360 * freq * 1 ns
* = 360 * freq * 1 sec / 1000000000
* = 9 * freq / 25000000
*/
ret = clk_set_phase(mxic->send_dly_clk, 9 * freq / 25000000);
if (ret)
return ret;
return 0;
}
static int mxic_spi_set_freq(struct mxic_spi *mxic, unsigned long freq)
{
int ret;
if (mxic->cur_speed_hz == freq)
return 0;
mxic_spi_clk_disable(mxic);
ret = mxic_spi_clk_setup(mxic, freq);
if (ret)
return ret;
ret = mxic_spi_clk_enable(mxic);
if (ret)
return ret;
mxic->cur_speed_hz = freq;
return 0;
}
static void mxic_spi_hw_init(struct mxic_spi *mxic)
{
writel(0, mxic->regs + DATA_STROB);
writel(INT_STS_ALL, mxic->regs + INT_STS_EN);
writel(0, mxic->regs + HC_EN);
writel(0, mxic->regs + LRD_CFG);
writel(0, mxic->regs + LRD_CTRL);
writel(HC_CFG_NIO(1) | HC_CFG_TYPE(0, HC_CFG_TYPE_SPI_NOR) |
HC_CFG_SLV_ACT(0) | HC_CFG_MAN_CS_EN | HC_CFG_IDLE_SIO_LVL(1),
mxic->regs + HC_CFG);
}
static int mxic_spi_data_xfer(struct mxic_spi *mxic, const void *txbuf,
void *rxbuf, unsigned int len)
{
unsigned int pos = 0;
while (pos < len) {
unsigned int nbytes = len - pos;
u32 data = 0xffffffff;
u32 sts;
int ret;
if (nbytes > 4)
nbytes = 4;
if (txbuf)
memcpy(&data, txbuf + pos, nbytes);
ret = readl_poll_timeout(mxic->regs + INT_STS, sts,
sts & INT_TX_EMPTY, 0, USEC_PER_SEC);
if (ret)
return ret;
writel(data, mxic->regs + TXD(nbytes % 4));
if (rxbuf) {
ret = readl_poll_timeout(mxic->regs + INT_STS, sts,
sts & INT_TX_EMPTY, 0,
USEC_PER_SEC);
if (ret)
return ret;
ret = readl_poll_timeout(mxic->regs + INT_STS, sts,
sts & INT_RX_NOT_EMPTY, 0,
USEC_PER_SEC);
if (ret)
return ret;
data = readl(mxic->regs + RXD);
data >>= (8 * (4 - nbytes));
memcpy(rxbuf + pos, &data, nbytes);
WARN_ON(readl(mxic->regs + INT_STS) & INT_RX_NOT_EMPTY);
} else {
readl(mxic->regs + RXD);
}
WARN_ON(readl(mxic->regs + INT_STS) & INT_RX_NOT_EMPTY);
pos += nbytes;
}
return 0;
}
static bool mxic_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)
return false;
if (op->data.nbytes && op->dummy.nbytes &&
op->data.buswidth != op->dummy.buswidth)
return false;
if (op->addr.nbytes > 7)
return false;
return spi_mem_default_supports_op(mem, op);
}
static int mxic_spi_mem_exec_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
struct mxic_spi *mxic = spi_master_get_devdata(mem->spi->master);
int nio = 1, i, ret;
u32 ss_ctrl;
u8 addr[8];
u8 opcode = op->cmd.opcode;
ret = mxic_spi_set_freq(mxic, mem->spi->max_speed_hz);
if (ret)
return ret;
if (mem->spi->mode & (SPI_TX_QUAD | SPI_RX_QUAD))
nio = 4;
else if (mem->spi->mode & (SPI_TX_DUAL | SPI_RX_DUAL))
nio = 2;
writel(HC_CFG_NIO(nio) |
HC_CFG_TYPE(mem->spi->chip_select, HC_CFG_TYPE_SPI_NOR) |
HC_CFG_SLV_ACT(mem->spi->chip_select) | HC_CFG_IDLE_SIO_LVL(1) |
HC_CFG_MAN_CS_EN,
mxic->regs + HC_CFG);
writel(HC_EN_BIT, mxic->regs + HC_EN);
ss_ctrl = OP_CMD_BYTES(1) | OP_CMD_BUSW(fls(op->cmd.buswidth) - 1);
if (op->addr.nbytes)
ss_ctrl |= OP_ADDR_BYTES(op->addr.nbytes) |
OP_ADDR_BUSW(fls(op->addr.buswidth) - 1);
if (op->dummy.nbytes)
ss_ctrl |= OP_DUMMY_CYC(op->dummy.nbytes);
if (op->data.nbytes) {
ss_ctrl |= OP_DATA_BUSW(fls(op->data.buswidth) - 1);
if (op->data.dir == SPI_MEM_DATA_IN)
ss_ctrl |= OP_READ;
}
writel(ss_ctrl, mxic->regs + SS_CTRL(mem->spi->chip_select));
writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_ASSERT,
mxic->regs + HC_CFG);
ret = mxic_spi_data_xfer(mxic, &opcode, NULL, 1);
if (ret)
goto out;
for (i = 0; i < op->addr.nbytes; i++)
addr[i] = op->addr.val >> (8 * (op->addr.nbytes - i - 1));
ret = mxic_spi_data_xfer(mxic, addr, NULL, op->addr.nbytes);
if (ret)
goto out;
ret = mxic_spi_data_xfer(mxic, NULL, NULL, op->dummy.nbytes);
if (ret)
goto out;
ret = mxic_spi_data_xfer(mxic,
op->data.dir == SPI_MEM_DATA_OUT ?
op->data.buf.out : NULL,
op->data.dir == SPI_MEM_DATA_IN ?
op->data.buf.in : NULL,
op->data.nbytes);
out:
writel(readl(mxic->regs + HC_CFG) & ~HC_CFG_MAN_CS_ASSERT,
mxic->regs + HC_CFG);
writel(0, mxic->regs + HC_EN);
return ret;
}
static const struct spi_controller_mem_ops mxic_spi_mem_ops = {
.supports_op = mxic_spi_mem_supports_op,
.exec_op = mxic_spi_mem_exec_op,
};
static void mxic_spi_set_cs(struct spi_device *spi, bool lvl)
{
struct mxic_spi *mxic = spi_master_get_devdata(spi->master);
if (!lvl) {
writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_EN,
mxic->regs + HC_CFG);
writel(HC_EN_BIT, mxic->regs + HC_EN);
writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_ASSERT,
mxic->regs + HC_CFG);
} else {
writel(readl(mxic->regs + HC_CFG) & ~HC_CFG_MAN_CS_ASSERT,
mxic->regs + HC_CFG);
writel(0, mxic->regs + HC_EN);
}
}
static int mxic_spi_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *t)
{
struct mxic_spi *mxic = spi_master_get_devdata(master);
unsigned int busw = OP_BUSW_1;
int ret;
if (t->rx_buf && t->tx_buf) {
if (((spi->mode & SPI_TX_QUAD) &&
!(spi->mode & SPI_RX_QUAD)) ||
((spi->mode & SPI_TX_DUAL) &&
!(spi->mode & SPI_RX_DUAL)))
return -ENOTSUPP;
}
ret = mxic_spi_set_freq(mxic, t->speed_hz);
if (ret)
return ret;
if (t->tx_buf) {
if (spi->mode & SPI_TX_QUAD)
busw = OP_BUSW_4;
else if (spi->mode & SPI_TX_DUAL)
busw = OP_BUSW_2;
} else if (t->rx_buf) {
if (spi->mode & SPI_RX_QUAD)
busw = OP_BUSW_4;
else if (spi->mode & SPI_RX_DUAL)
busw = OP_BUSW_2;
}
writel(OP_CMD_BYTES(1) | OP_CMD_BUSW(busw) |
OP_DATA_BUSW(busw) | (t->rx_buf ? OP_READ : 0),
mxic->regs + SS_CTRL(0));
ret = mxic_spi_data_xfer(mxic, t->tx_buf, t->rx_buf, t->len);
if (ret)
return ret;
spi_finalize_current_transfer(master);
return 0;
}
static int __maybe_unused mxic_spi_runtime_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct mxic_spi *mxic = spi_master_get_devdata(master);
mxic_spi_clk_disable(mxic);
clk_disable_unprepare(mxic->ps_clk);
return 0;
}
static int __maybe_unused mxic_spi_runtime_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct mxic_spi *mxic = spi_master_get_devdata(master);
int ret;
ret = clk_prepare_enable(mxic->ps_clk);
if (ret) {
dev_err(dev, "Cannot enable ps_clock.\n");
return ret;
}
return mxic_spi_clk_enable(mxic);
}
static const struct dev_pm_ops mxic_spi_dev_pm_ops = {
SET_RUNTIME_PM_OPS(mxic_spi_runtime_suspend,
mxic_spi_runtime_resume, NULL)
};
static int mxic_spi_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct resource *res;
struct mxic_spi *mxic;
int ret;
master = devm_spi_alloc_master(&pdev->dev, sizeof(struct mxic_spi));
if (!master)
return -ENOMEM;
platform_set_drvdata(pdev, master);
mxic = spi_master_get_devdata(master);
master->dev.of_node = pdev->dev.of_node;
mxic->ps_clk = devm_clk_get(&pdev->dev, "ps_clk");
if (IS_ERR(mxic->ps_clk))
return PTR_ERR(mxic->ps_clk);
mxic->send_clk = devm_clk_get(&pdev->dev, "send_clk");
if (IS_ERR(mxic->send_clk))
return PTR_ERR(mxic->send_clk);
mxic->send_dly_clk = devm_clk_get(&pdev->dev, "send_dly_clk");
if (IS_ERR(mxic->send_dly_clk))
return PTR_ERR(mxic->send_dly_clk);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
mxic->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(mxic->regs))
return PTR_ERR(mxic->regs);
pm_runtime_enable(&pdev->dev);
master->auto_runtime_pm = true;
master->num_chipselect = 1;
master->mem_ops = &mxic_spi_mem_ops;
master->set_cs = mxic_spi_set_cs;
master->transfer_one = mxic_spi_transfer_one;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->mode_bits = SPI_CPOL | SPI_CPHA |
SPI_RX_DUAL | SPI_TX_DUAL |
SPI_RX_QUAD | SPI_TX_QUAD;
mxic_spi_hw_init(mxic);
ret = spi_register_master(master);
if (ret) {
dev_err(&pdev->dev, "spi_register_master failed\n");
pm_runtime_disable(&pdev->dev);
}
return ret;
}
static int mxic_spi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
spi_unregister_master(master);
return 0;
}
static const struct of_device_id mxic_spi_of_ids[] = {
{ .compatible = "mxicy,mx25f0a-spi", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxic_spi_of_ids);
static struct platform_driver mxic_spi_driver = {
.probe = mxic_spi_probe,
.remove = mxic_spi_remove,
.driver = {
.name = "mxic-spi",
.of_match_table = mxic_spi_of_ids,
.pm = &mxic_spi_dev_pm_ops,
},
};
module_platform_driver(mxic_spi_driver);
MODULE_AUTHOR("Mason Yang <masonccyang@mxic.com.tw>");
MODULE_DESCRIPTION("MX25F0A SPI controller driver");
MODULE_LICENSE("GPL v2");
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