--- /dev/null
+// 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_DIR_READ BIT(31)
+#define DMAS_CTRL_EN 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_NAND) |
+ 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 true;
+}
+
+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];
+
+ 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, &op->cmd.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 platform_device *pdev = to_platform_device(dev);
+ struct spi_master *master = platform_get_drvdata(pdev);
+ 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 platform_device *pdev = to_platform_device(dev);
+ struct spi_master *master = platform_get_drvdata(pdev);
+ 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 = 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");
+ goto err_put_master;
+ }
+
+ return 0;
+
+err_put_master:
+ spi_master_put(master);
+ 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");
projects / openwrt / staging / blogic.git / commitdiff