diff options
Diffstat (limited to 'drivers/memory/pl353-smc.c')
| -rw-r--r-- | drivers/memory/pl353-smc.c | 463 |
1 files changed, 463 insertions, 0 deletions
diff --git a/drivers/memory/pl353-smc.c b/drivers/memory/pl353-smc.c new file mode 100644 index 000000000..1a6964f1b --- /dev/null +++ b/drivers/memory/pl353-smc.c @@ -0,0 +1,463 @@ +// 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 0x3 + +#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) { + err = -ENODEV; + 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); + of_node_put(child); + + return 0; + +out_clk_disable: + clk_disable_unprepare(pl353_smc->memclk); +out_clk_dis_aper: + clk_disable_unprepare(pl353_smc->aclk); + + return err; +} + +static void 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); +} + +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"); |