--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ARM PL353 SMC driver
+ *
+ * Copyright (C) 2012 - 2018 Xilinx, Inc
+ * Author: Punnaiah Choudary Kalluri <punnaiah@xilinx.com>
+ * Author: Naga Sureshkumar Relli <nagasure@xilinx.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pl353-smc.h>
+#include <linux/amba/bus.h>
+
+/* Register definitions */
+#define PL353_SMC_MEMC_STATUS_OFFS 0 /* Controller status reg, RO */
+#define PL353_SMC_CFG_CLR_OFFS 0xC /* Clear config reg, WO */
+#define PL353_SMC_DIRECT_CMD_OFFS 0x10 /* Direct command reg, WO */
+#define PL353_SMC_SET_CYCLES_OFFS 0x14 /* Set cycles register, WO */
+#define PL353_SMC_SET_OPMODE_OFFS 0x18 /* Set opmode register, WO */
+#define PL353_SMC_ECC_STATUS_OFFS 0x400 /* ECC status register */
+#define PL353_SMC_ECC_MEMCFG_OFFS 0x404 /* ECC mem config reg */
+#define PL353_SMC_ECC_MEMCMD1_OFFS 0x408 /* ECC mem cmd1 reg */
+#define PL353_SMC_ECC_MEMCMD2_OFFS 0x40C /* ECC mem cmd2 reg */
+#define PL353_SMC_ECC_VALUE0_OFFS 0x418 /* ECC value 0 reg */
+
+/* Controller status register specific constants */
+#define PL353_SMC_MEMC_STATUS_RAW_INT_1_SHIFT 6
+
+/* Clear configuration register specific constants */
+#define PL353_SMC_CFG_CLR_INT_CLR_1 0x10
+#define PL353_SMC_CFG_CLR_ECC_INT_DIS_1 0x40
+#define PL353_SMC_CFG_CLR_INT_DIS_1 0x2
+#define PL353_SMC_CFG_CLR_DEFAULT_MASK (PL353_SMC_CFG_CLR_INT_CLR_1 | \
+ PL353_SMC_CFG_CLR_ECC_INT_DIS_1 | \
+ PL353_SMC_CFG_CLR_INT_DIS_1)
+
+/* Set cycles register specific constants */
+#define PL353_SMC_SET_CYCLES_T0_MASK 0xF
+#define PL353_SMC_SET_CYCLES_T0_SHIFT 0
+#define PL353_SMC_SET_CYCLES_T1_MASK 0xF
+#define PL353_SMC_SET_CYCLES_T1_SHIFT 4
+#define PL353_SMC_SET_CYCLES_T2_MASK 0x7
+#define PL353_SMC_SET_CYCLES_T2_SHIFT 8
+#define PL353_SMC_SET_CYCLES_T3_MASK 0x7
+#define PL353_SMC_SET_CYCLES_T3_SHIFT 11
+#define PL353_SMC_SET_CYCLES_T4_MASK 0x7
+#define PL353_SMC_SET_CYCLES_T4_SHIFT 14
+#define PL353_SMC_SET_CYCLES_T5_MASK 0x7
+#define PL353_SMC_SET_CYCLES_T5_SHIFT 17
+#define PL353_SMC_SET_CYCLES_T6_MASK 0xF
+#define PL353_SMC_SET_CYCLES_T6_SHIFT 20
+
+/* ECC status register specific constants */
+#define PL353_SMC_ECC_STATUS_BUSY BIT(6)
+#define PL353_SMC_ECC_REG_SIZE_OFFS 4
+
+/* ECC memory config register specific constants */
+#define PL353_SMC_ECC_MEMCFG_MODE_MASK 0xC
+#define PL353_SMC_ECC_MEMCFG_MODE_SHIFT 2
+#define PL353_SMC_ECC_MEMCFG_PGSIZE_MASK 0xC
+
+#define PL353_SMC_DC_UPT_NAND_REGS ((4 << 23) | /* CS: NAND chip */ \
+ (2 << 21)) /* UpdateRegs operation */
+
+#define PL353_NAND_ECC_CMD1 ((0x80) | /* Write command */ \
+ (0 << 8) | /* Read command */ \
+ (0x30 << 16) | /* Read End command */ \
+ (1 << 24)) /* Read End command calid */
+
+#define PL353_NAND_ECC_CMD2 ((0x85) | /* Write col change cmd */ \
+ (5 << 8) | /* Read col change cmd */ \
+ (0xE0 << 16) | /* Read col change end cmd */ \
+ (1 << 24)) /* Read col change end cmd valid */
+#define PL353_NAND_ECC_BUSY_TIMEOUT (1 * HZ)
+/**
+ * struct pl353_smc_data - Private smc driver structure
+ * @memclk: Pointer to the peripheral clock
+ * @aclk: Pointer to the APER clock
+ */
+struct pl353_smc_data {
+ struct clk *memclk;
+ struct clk *aclk;
+};
+
+/* SMC virtual register base */
+static void __iomem *pl353_smc_base;
+
+/**
+ * pl353_smc_set_buswidth - Set memory buswidth
+ * @bw: Memory buswidth (8 | 16)
+ * Return: 0 on success or negative errno.
+ */
+int pl353_smc_set_buswidth(unsigned int bw)
+{
+ if (bw != PL353_SMC_MEM_WIDTH_8 && bw != PL353_SMC_MEM_WIDTH_16)
+ return -EINVAL;
+
+ writel(bw, pl353_smc_base + PL353_SMC_SET_OPMODE_OFFS);
+ writel(PL353_SMC_DC_UPT_NAND_REGS, pl353_smc_base +
+ PL353_SMC_DIRECT_CMD_OFFS);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pl353_smc_set_buswidth);
+
+/**
+ * pl353_smc_set_cycles - Set memory timing parameters
+ * @timings: NAND controller timing parameters
+ *
+ * Sets NAND chip specific timing parameters.
+ */
+void pl353_smc_set_cycles(u32 timings[])
+{
+ /*
+ * Set write pulse timing. This one is easy to extract:
+ *
+ * NWE_PULSE = tWP
+ */
+ timings[0] &= PL353_SMC_SET_CYCLES_T0_MASK;
+ timings[1] = (timings[1] & PL353_SMC_SET_CYCLES_T1_MASK) <<
+ PL353_SMC_SET_CYCLES_T1_SHIFT;
+ timings[2] = (timings[2] & PL353_SMC_SET_CYCLES_T2_MASK) <<
+ PL353_SMC_SET_CYCLES_T2_SHIFT;
+ timings[3] = (timings[3] & PL353_SMC_SET_CYCLES_T3_MASK) <<
+ PL353_SMC_SET_CYCLES_T3_SHIFT;
+ timings[4] = (timings[4] & PL353_SMC_SET_CYCLES_T4_MASK) <<
+ PL353_SMC_SET_CYCLES_T4_SHIFT;
+ timings[5] = (timings[5] & PL353_SMC_SET_CYCLES_T5_MASK) <<
+ PL353_SMC_SET_CYCLES_T5_SHIFT;
+ timings[6] = (timings[6] & PL353_SMC_SET_CYCLES_T6_MASK) <<
+ PL353_SMC_SET_CYCLES_T6_SHIFT;
+ timings[0] |= timings[1] | timings[2] | timings[3] |
+ timings[4] | timings[5] | timings[6];
+
+ writel(timings[0], pl353_smc_base + PL353_SMC_SET_CYCLES_OFFS);
+ writel(PL353_SMC_DC_UPT_NAND_REGS, pl353_smc_base +
+ PL353_SMC_DIRECT_CMD_OFFS);
+}
+EXPORT_SYMBOL_GPL(pl353_smc_set_cycles);
+
+/**
+ * pl353_smc_ecc_is_busy - Read ecc busy flag
+ * Return: the ecc_status bit from the ecc_status register. 1 = busy, 0 = idle
+ */
+bool pl353_smc_ecc_is_busy(void)
+{
+ return ((readl(pl353_smc_base + PL353_SMC_ECC_STATUS_OFFS) &
+ PL353_SMC_ECC_STATUS_BUSY) == PL353_SMC_ECC_STATUS_BUSY);
+}
+EXPORT_SYMBOL_GPL(pl353_smc_ecc_is_busy);
+
+/**
+ * pl353_smc_get_ecc_val - Read ecc_valueN registers
+ * @ecc_reg: Index of the ecc_value reg (0..3)
+ * Return: the content of the requested ecc_value register.
+ *
+ * There are four valid ecc_value registers. The argument is truncated to stay
+ * within this valid boundary.
+ */
+u32 pl353_smc_get_ecc_val(int ecc_reg)
+{
+ u32 addr, reg;
+
+ addr = PL353_SMC_ECC_VALUE0_OFFS +
+ (ecc_reg * PL353_SMC_ECC_REG_SIZE_OFFS);
+ reg = readl(pl353_smc_base + addr);
+
+ return reg;
+}
+EXPORT_SYMBOL_GPL(pl353_smc_get_ecc_val);
+
+/**
+ * pl353_smc_get_nand_int_status_raw - Get NAND interrupt status bit
+ * Return: the raw_int_status1 bit from the memc_status register
+ */
+int pl353_smc_get_nand_int_status_raw(void)
+{
+ u32 reg;
+
+ reg = readl(pl353_smc_base + PL353_SMC_MEMC_STATUS_OFFS);
+ reg >>= PL353_SMC_MEMC_STATUS_RAW_INT_1_SHIFT;
+ reg &= 1;
+
+ return reg;
+}
+EXPORT_SYMBOL_GPL(pl353_smc_get_nand_int_status_raw);
+
+/**
+ * pl353_smc_clr_nand_int - Clear NAND interrupt
+ */
+void pl353_smc_clr_nand_int(void)
+{
+ writel(PL353_SMC_CFG_CLR_INT_CLR_1,
+ pl353_smc_base + PL353_SMC_CFG_CLR_OFFS);
+}
+EXPORT_SYMBOL_GPL(pl353_smc_clr_nand_int);
+
+/**
+ * pl353_smc_set_ecc_mode - Set SMC ECC mode
+ * @mode: ECC mode (BYPASS, APB, MEM)
+ * Return: 0 on success or negative errno.
+ */
+int pl353_smc_set_ecc_mode(enum pl353_smc_ecc_mode mode)
+{
+ u32 reg;
+ int ret = 0;
+
+ switch (mode) {
+ case PL353_SMC_ECCMODE_BYPASS:
+ case PL353_SMC_ECCMODE_APB:
+ case PL353_SMC_ECCMODE_MEM:
+
+ reg = readl(pl353_smc_base + PL353_SMC_ECC_MEMCFG_OFFS);
+ reg &= ~PL353_SMC_ECC_MEMCFG_MODE_MASK;
+ reg |= mode << PL353_SMC_ECC_MEMCFG_MODE_SHIFT;
+ writel(reg, pl353_smc_base + PL353_SMC_ECC_MEMCFG_OFFS);
+
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(pl353_smc_set_ecc_mode);
+
+/**
+ * pl353_smc_set_ecc_pg_size - Set SMC ECC page size
+ * @pg_sz: ECC page size
+ * Return: 0 on success or negative errno.
+ */
+int pl353_smc_set_ecc_pg_size(unsigned int pg_sz)
+{
+ u32 reg, sz;
+
+ switch (pg_sz) {
+ case 0:
+ sz = 0;
+ break;
+ case SZ_512:
+ sz = 1;
+ break;
+ case SZ_1K:
+ sz = 2;
+ break;
+ case SZ_2K:
+ sz = 3;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ reg = readl(pl353_smc_base + PL353_SMC_ECC_MEMCFG_OFFS);
+ reg &= ~PL353_SMC_ECC_MEMCFG_PGSIZE_MASK;
+ reg |= sz;
+ writel(reg, pl353_smc_base + PL353_SMC_ECC_MEMCFG_OFFS);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pl353_smc_set_ecc_pg_size);
+
+static int __maybe_unused pl353_smc_suspend(struct device *dev)
+{
+ struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
+
+ clk_disable(pl353_smc->memclk);
+ clk_disable(pl353_smc->aclk);
+
+ return 0;
+}
+
+static int __maybe_unused pl353_smc_resume(struct device *dev)
+{
+ int ret;
+ struct pl353_smc_data *pl353_smc = dev_get_drvdata(dev);
+
+ ret = clk_enable(pl353_smc->aclk);
+ if (ret) {
+ dev_err(dev, "Cannot enable axi domain clock.\n");
+ return ret;
+ }
+
+ ret = clk_enable(pl353_smc->memclk);
+ if (ret) {
+ dev_err(dev, "Cannot enable memory clock.\n");
+ clk_disable(pl353_smc->aclk);
+ return ret;
+ }
+
+ return ret;
+}
+
+static struct amba_driver pl353_smc_driver;
+
+static SIMPLE_DEV_PM_OPS(pl353_smc_dev_pm_ops, pl353_smc_suspend,
+ pl353_smc_resume);
+
+/**
+ * pl353_smc_init_nand_interface - Initialize the NAND interface
+ * @adev: Pointer to the amba_device struct
+ * @nand_node: Pointer to the pl353_nand device_node struct
+ */
+static void pl353_smc_init_nand_interface(struct amba_device *adev,
+ struct device_node *nand_node)
+{
+ unsigned long timeout;
+
+ pl353_smc_set_buswidth(PL353_SMC_MEM_WIDTH_8);
+ writel(PL353_SMC_CFG_CLR_INT_CLR_1,
+ pl353_smc_base + PL353_SMC_CFG_CLR_OFFS);
+ writel(PL353_SMC_DC_UPT_NAND_REGS, pl353_smc_base +
+ PL353_SMC_DIRECT_CMD_OFFS);
+
+ timeout = jiffies + PL353_NAND_ECC_BUSY_TIMEOUT;
+ /* Wait till the ECC operation is complete */
+ do {
+ if (pl353_smc_ecc_is_busy())
+ cpu_relax();
+ else
+ break;
+ } while (!time_after_eq(jiffies, timeout));
+
+ if (time_after_eq(jiffies, timeout))
+ return;
+
+ writel(PL353_NAND_ECC_CMD1,
+ pl353_smc_base + PL353_SMC_ECC_MEMCMD1_OFFS);
+ writel(PL353_NAND_ECC_CMD2,
+ pl353_smc_base + PL353_SMC_ECC_MEMCMD2_OFFS);
+}
+
+static const struct of_device_id pl353_smc_supported_children[] = {
+ {
+ .compatible = "cfi-flash"
+ },
+ {
+ .compatible = "arm,pl353-nand-r2p1",
+ .data = pl353_smc_init_nand_interface
+ },
+ {}
+};
+
+static int pl353_smc_probe(struct amba_device *adev, const struct amba_id *id)
+{
+ struct pl353_smc_data *pl353_smc;
+ struct device_node *child;
+ struct resource *res;
+ int err;
+ struct device_node *of_node = adev->dev.of_node;
+ static void (*init)(struct amba_device *adev,
+ struct device_node *nand_node);
+ const struct of_device_id *match = NULL;
+
+ pl353_smc = devm_kzalloc(&adev->dev, sizeof(*pl353_smc), GFP_KERNEL);
+ if (!pl353_smc)
+ return -ENOMEM;
+
+ /* Get the NAND controller virtual address */
+ res = &adev->res;
+ pl353_smc_base = devm_ioremap_resource(&adev->dev, res);
+ if (IS_ERR(pl353_smc_base))
+ return PTR_ERR(pl353_smc_base);
+
+ pl353_smc->aclk = devm_clk_get(&adev->dev, "apb_pclk");
+ if (IS_ERR(pl353_smc->aclk)) {
+ dev_err(&adev->dev, "aclk clock not found.\n");
+ return PTR_ERR(pl353_smc->aclk);
+ }
+
+ pl353_smc->memclk = devm_clk_get(&adev->dev, "memclk");
+ if (IS_ERR(pl353_smc->memclk)) {
+ dev_err(&adev->dev, "memclk clock not found.\n");
+ return PTR_ERR(pl353_smc->memclk);
+ }
+
+ err = clk_prepare_enable(pl353_smc->aclk);
+ if (err) {
+ dev_err(&adev->dev, "Unable to enable AXI clock.\n");
+ return err;
+ }
+
+ err = clk_prepare_enable(pl353_smc->memclk);
+ if (err) {
+ dev_err(&adev->dev, "Unable to enable memory clock.\n");
+ goto out_clk_dis_aper;
+ }
+
+ amba_set_drvdata(adev, pl353_smc);
+
+ /* clear interrupts */
+ writel(PL353_SMC_CFG_CLR_DEFAULT_MASK,
+ pl353_smc_base + PL353_SMC_CFG_CLR_OFFS);
+
+ /* Find compatible children. Only a single child is supported */
+ for_each_available_child_of_node(of_node, child) {
+ match = of_match_node(pl353_smc_supported_children, child);
+ if (!match) {
+ dev_warn(&adev->dev, "unsupported child node\n");
+ continue;
+ }
+ break;
+ }
+ if (!match) {
+ dev_err(&adev->dev, "no matching children\n");
+ goto out_clk_disable;
+ }
+
+ init = match->data;
+ if (init)
+ init(adev, child);
+ of_platform_device_create(child, NULL, &adev->dev);
+
+ return 0;
+
+out_clk_disable:
+ clk_disable_unprepare(pl353_smc->memclk);
+out_clk_dis_aper:
+ clk_disable_unprepare(pl353_smc->aclk);
+
+ return err;
+}
+
+static int pl353_smc_remove(struct amba_device *adev)
+{
+ struct pl353_smc_data *pl353_smc = amba_get_drvdata(adev);
+
+ clk_disable_unprepare(pl353_smc->memclk);
+ clk_disable_unprepare(pl353_smc->aclk);
+
+ return 0;
+}
+
+static const struct amba_id pl353_ids[] = {
+ {
+ .id = 0x00041353,
+ .mask = 0x000fffff,
+ },
+ { 0, 0 },
+};
+MODULE_DEVICE_TABLE(amba, pl353_ids);
+
+static struct amba_driver pl353_smc_driver = {
+ .drv = {
+ .owner = THIS_MODULE,
+ .name = "pl353-smc",
+ .pm = &pl353_smc_dev_pm_ops,
+ },
+ .id_table = pl353_ids,
+ .probe = pl353_smc_probe,
+ .remove = pl353_smc_remove,
+};
+
+module_amba_driver(pl353_smc_driver);
+
+MODULE_AUTHOR("Xilinx, Inc.");
+MODULE_DESCRIPTION("ARM PL353 SMC Driver");
+MODULE_LICENSE("GPL");
projects / zynq / linux.git / commitdiff