/* * Driver for Cadence QSPI Controller * * Copyright Altera Corporation (C) 2012-2014. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define CQSPI_NAME "cadence-qspi" #define CQSPI_MAX_CHIPSELECT 16 struct cqspi_st; struct cqspi_flash_pdata { struct spi_nor nor; struct cqspi_st *cqspi; u32 clk_rate; u32 read_delay; u32 tshsl_ns; u32 tsd2d_ns; u32 tchsh_ns; u32 tslch_ns; u8 inst_width; u8 addr_width; u8 data_width; u8 cs; bool registered; }; struct cqspi_st { struct platform_device *pdev; struct clk *clk; unsigned int sclk; void __iomem *iobase; void __iomem *ahb_base; struct completion transfer_complete; struct mutex bus_mutex; int current_cs; int current_page_size; int current_erase_size; int current_addr_width; unsigned long master_ref_clk_hz; bool is_decoded_cs; u32 fifo_depth; u32 fifo_width; u32 trigger_address; struct cqspi_flash_pdata f_pdata[CQSPI_MAX_CHIPSELECT]; }; /* Operation timeout value */ #define CQSPI_TIMEOUT_MS 500 #define CQSPI_READ_TIMEOUT_MS 10 /* Instruction type */ #define CQSPI_INST_TYPE_SINGLE 0 #define CQSPI_INST_TYPE_DUAL 1 #define CQSPI_INST_TYPE_QUAD 2 #define CQSPI_DUMMY_CLKS_PER_BYTE 8 #define CQSPI_DUMMY_BYTES_MAX 4 #define CQSPI_DUMMY_CLKS_MAX 31 #define CQSPI_STIG_DATA_LEN_MAX 8 /* Register map */ #define CQSPI_REG_CONFIG 0x00 #define CQSPI_REG_CONFIG_ENABLE_MASK BIT(0) #define CQSPI_REG_CONFIG_DECODE_MASK BIT(9) #define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10 #define CQSPI_REG_CONFIG_DMA_MASK BIT(15) #define CQSPI_REG_CONFIG_BAUD_LSB 19 #define CQSPI_REG_CONFIG_IDLE_LSB 31 #define CQSPI_REG_CONFIG_CHIPSELECT_MASK 0xF #define CQSPI_REG_CONFIG_BAUD_MASK 0xF #define CQSPI_REG_RD_INSTR 0x04 #define CQSPI_REG_RD_INSTR_OPCODE_LSB 0 #define CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB 8 #define CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB 12 #define CQSPI_REG_RD_INSTR_TYPE_DATA_LSB 16 #define CQSPI_REG_RD_INSTR_MODE_EN_LSB 20 #define CQSPI_REG_RD_INSTR_DUMMY_LSB 24 #define CQSPI_REG_RD_INSTR_TYPE_INSTR_MASK 0x3 #define CQSPI_REG_RD_INSTR_TYPE_ADDR_MASK 0x3 #define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK 0x3 #define CQSPI_REG_RD_INSTR_DUMMY_MASK 0x1F #define CQSPI_REG_WR_INSTR 0x08 #define CQSPI_REG_WR_INSTR_OPCODE_LSB 0 #define CQSPI_REG_WR_INSTR_TYPE_ADDR_LSB 12 #define CQSPI_REG_WR_INSTR_TYPE_DATA_LSB 16 #define CQSPI_REG_DELAY 0x0C #define CQSPI_REG_DELAY_TSLCH_LSB 0 #define CQSPI_REG_DELAY_TCHSH_LSB 8 #define CQSPI_REG_DELAY_TSD2D_LSB 16 #define CQSPI_REG_DELAY_TSHSL_LSB 24 #define CQSPI_REG_DELAY_TSLCH_MASK 0xFF #define CQSPI_REG_DELAY_TCHSH_MASK 0xFF #define CQSPI_REG_DELAY_TSD2D_MASK 0xFF #define CQSPI_REG_DELAY_TSHSL_MASK 0xFF #define CQSPI_REG_READCAPTURE 0x10 #define CQSPI_REG_READCAPTURE_BYPASS_LSB 0 #define CQSPI_REG_READCAPTURE_DELAY_LSB 1 #define CQSPI_REG_READCAPTURE_DELAY_MASK 0xF #define CQSPI_REG_SIZE 0x14 #define CQSPI_REG_SIZE_ADDRESS_LSB 0 #define CQSPI_REG_SIZE_PAGE_LSB 4 #define CQSPI_REG_SIZE_BLOCK_LSB 16 #define CQSPI_REG_SIZE_ADDRESS_MASK 0xF #define CQSPI_REG_SIZE_PAGE_MASK 0xFFF #define CQSPI_REG_SIZE_BLOCK_MASK 0x3F #define CQSPI_REG_SRAMPARTITION 0x18 #define CQSPI_REG_INDIRECTTRIGGER 0x1C #define CQSPI_REG_DMA 0x20 #define CQSPI_REG_DMA_SINGLE_LSB 0 #define CQSPI_REG_DMA_BURST_LSB 8 #define CQSPI_REG_DMA_SINGLE_MASK 0xFF #define CQSPI_REG_DMA_BURST_MASK 0xFF #define CQSPI_REG_REMAP 0x24 #define CQSPI_REG_MODE_BIT 0x28 #define CQSPI_REG_SDRAMLEVEL 0x2C #define CQSPI_REG_SDRAMLEVEL_RD_LSB 0 #define CQSPI_REG_SDRAMLEVEL_WR_LSB 16 #define CQSPI_REG_SDRAMLEVEL_RD_MASK 0xFFFF #define CQSPI_REG_SDRAMLEVEL_WR_MASK 0xFFFF #define CQSPI_REG_IRQSTATUS 0x40 #define CQSPI_REG_IRQMASK 0x44 #define CQSPI_REG_INDIRECTRD 0x60 #define CQSPI_REG_INDIRECTRD_START_MASK BIT(0) #define CQSPI_REG_INDIRECTRD_CANCEL_MASK BIT(1) #define CQSPI_REG_INDIRECTRD_DONE_MASK BIT(5) #define CQSPI_REG_INDIRECTRDWATERMARK 0x64 #define CQSPI_REG_INDIRECTRDSTARTADDR 0x68 #define CQSPI_REG_INDIRECTRDBYTES 0x6C #define CQSPI_REG_CMDCTRL 0x90 #define CQSPI_REG_CMDCTRL_EXECUTE_MASK BIT(0) #define CQSPI_REG_CMDCTRL_INPROGRESS_MASK BIT(1) #define CQSPI_REG_CMDCTRL_WR_BYTES_LSB 12 #define CQSPI_REG_CMDCTRL_WR_EN_LSB 15 #define CQSPI_REG_CMDCTRL_ADD_BYTES_LSB 16 #define CQSPI_REG_CMDCTRL_ADDR_EN_LSB 19 #define CQSPI_REG_CMDCTRL_RD_BYTES_LSB 20 #define CQSPI_REG_CMDCTRL_RD_EN_LSB 23 #define CQSPI_REG_CMDCTRL_OPCODE_LSB 24 #define CQSPI_REG_CMDCTRL_WR_BYTES_MASK 0x7 #define CQSPI_REG_CMDCTRL_ADD_BYTES_MASK 0x3 #define CQSPI_REG_CMDCTRL_RD_BYTES_MASK 0x7 #define CQSPI_REG_INDIRECTWR 0x70 #define CQSPI_REG_INDIRECTWR_START_MASK BIT(0) #define CQSPI_REG_INDIRECTWR_CANCEL_MASK BIT(1) #define CQSPI_REG_INDIRECTWR_DONE_MASK BIT(5) #define CQSPI_REG_INDIRECTWRWATERMARK 0x74 #define CQSPI_REG_INDIRECTWRSTARTADDR 0x78 #define CQSPI_REG_INDIRECTWRBYTES 0x7C #define CQSPI_REG_CMDADDRESS 0x94 #define CQSPI_REG_CMDREADDATALOWER 0xA0 #define CQSPI_REG_CMDREADDATAUPPER 0xA4 #define CQSPI_REG_CMDWRITEDATALOWER 0xA8 #define CQSPI_REG_CMDWRITEDATAUPPER 0xAC /* Interrupt status bits */ #define CQSPI_REG_IRQ_MODE_ERR BIT(0) #define CQSPI_REG_IRQ_UNDERFLOW BIT(1) #define CQSPI_REG_IRQ_IND_COMP BIT(2) #define CQSPI_REG_IRQ_IND_RD_REJECT BIT(3) #define CQSPI_REG_IRQ_WR_PROTECTED_ERR BIT(4) #define CQSPI_REG_IRQ_ILLEGAL_AHB_ERR BIT(5) #define CQSPI_REG_IRQ_WATERMARK BIT(6) #define CQSPI_REG_IRQ_IND_SRAM_FULL BIT(12) #define CQSPI_IRQ_MASK_RD (CQSPI_REG_IRQ_WATERMARK | \ CQSPI_REG_IRQ_IND_SRAM_FULL | \ CQSPI_REG_IRQ_IND_COMP) #define CQSPI_IRQ_MASK_WR (CQSPI_REG_IRQ_IND_COMP | \ CQSPI_REG_IRQ_WATERMARK | \ CQSPI_REG_IRQ_UNDERFLOW) #define CQSPI_IRQ_STATUS_MASK 0x1FFFF static int cqspi_wait_for_bit(void __iomem *reg, const u32 mask, bool clear) { unsigned long end = jiffies + msecs_to_jiffies(CQSPI_TIMEOUT_MS); u32 val; while (1) { val = readl(reg); if (clear) val = ~val; val &= mask; if (val == mask) return 0; if (time_after(jiffies, end)) return -ETIMEDOUT; } } static bool cqspi_is_idle(struct cqspi_st *cqspi) { u32 reg = readl(cqspi->iobase + CQSPI_REG_CONFIG); return reg & (1 << CQSPI_REG_CONFIG_IDLE_LSB); } static u32 cqspi_get_rd_sram_level(struct cqspi_st *cqspi) { u32 reg = readl(cqspi->iobase + CQSPI_REG_SDRAMLEVEL); reg >>= CQSPI_REG_SDRAMLEVEL_RD_LSB; return reg & CQSPI_REG_SDRAMLEVEL_RD_MASK; } static irqreturn_t cqspi_irq_handler(int this_irq, void *dev) { struct cqspi_st *cqspi = dev; unsigned int irq_status; /* Read interrupt status */ irq_status = readl(cqspi->iobase + CQSPI_REG_IRQSTATUS); /* Clear interrupt */ writel(irq_status, cqspi->iobase + CQSPI_REG_IRQSTATUS); irq_status &= CQSPI_IRQ_MASK_RD | CQSPI_IRQ_MASK_WR; if (irq_status) complete(&cqspi->transfer_complete); return IRQ_HANDLED; } static unsigned int cqspi_calc_rdreg(struct spi_nor *nor, const u8 opcode) { struct cqspi_flash_pdata *f_pdata = nor->priv; u32 rdreg = 0; rdreg |= f_pdata->inst_width << CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB; rdreg |= f_pdata->addr_width << CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB; rdreg |= f_pdata->data_width << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB; return rdreg; } static int cqspi_wait_idle(struct cqspi_st *cqspi) { const unsigned int poll_idle_retry = 3; unsigned int count = 0; unsigned long timeout; timeout = jiffies + msecs_to_jiffies(CQSPI_TIMEOUT_MS); while (1) { /* * Read few times in succession to ensure the controller * is indeed idle, that is, the bit does not transition * low again. */ if (cqspi_is_idle(cqspi)) count++; else count = 0; if (count >= poll_idle_retry) return 0; if (time_after(jiffies, timeout)) { /* Timeout, in busy mode. */ dev_err(&cqspi->pdev->dev, "QSPI is still busy after %dms timeout.\n", CQSPI_TIMEOUT_MS); return -ETIMEDOUT; } cpu_relax(); } } static int cqspi_exec_flash_cmd(struct cqspi_st *cqspi, unsigned int reg) { void __iomem *reg_base = cqspi->iobase; int ret; /* Write the CMDCTRL without start execution. */ writel(reg, reg_base + CQSPI_REG_CMDCTRL); /* Start execute */ reg |= CQSPI_REG_CMDCTRL_EXECUTE_MASK; writel(reg, reg_base + CQSPI_REG_CMDCTRL); /* Polling for completion. */ ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_CMDCTRL, CQSPI_REG_CMDCTRL_INPROGRESS_MASK, 1); if (ret) { dev_err(&cqspi->pdev->dev, "Flash command execution timed out.\n"); return ret; } /* Polling QSPI idle status. */ return cqspi_wait_idle(cqspi); } static int cqspi_command_read(struct spi_nor *nor, const u8 *txbuf, const unsigned n_tx, u8 *rxbuf, const unsigned n_rx) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; void __iomem *reg_base = cqspi->iobase; unsigned int rdreg; unsigned int reg; unsigned int read_len; int status; if (!n_rx || n_rx > CQSPI_STIG_DATA_LEN_MAX || !rxbuf) { dev_err(nor->dev, "Invalid input argument, len %d rxbuf 0x%p\n", n_rx, rxbuf); return -EINVAL; } reg = txbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB; rdreg = cqspi_calc_rdreg(nor, txbuf[0]); writel(rdreg, reg_base + CQSPI_REG_RD_INSTR); reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB); /* 0 means 1 byte. */ reg |= (((n_rx - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK) << CQSPI_REG_CMDCTRL_RD_BYTES_LSB); status = cqspi_exec_flash_cmd(cqspi, reg); if (status) return status; reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER); /* Put the read value into rx_buf */ read_len = (n_rx > 4) ? 4 : n_rx; memcpy(rxbuf, ®, read_len); rxbuf += read_len; if (n_rx > 4) { reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER); read_len = n_rx - read_len; memcpy(rxbuf, ®, read_len); } return 0; } static int cqspi_command_write(struct spi_nor *nor, const u8 opcode, const u8 *txbuf, const unsigned n_tx) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; void __iomem *reg_base = cqspi->iobase; unsigned int reg; unsigned int data; int ret; if (n_tx > 4 || (n_tx && !txbuf)) { dev_err(nor->dev, "Invalid input argument, cmdlen %d txbuf 0x%p\n", n_tx, txbuf); return -EINVAL; } reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB; if (n_tx) { reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB); reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK) << CQSPI_REG_CMDCTRL_WR_BYTES_LSB; data = 0; memcpy(&data, txbuf, n_tx); writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER); } ret = cqspi_exec_flash_cmd(cqspi, reg); return ret; } static int cqspi_command_write_addr(struct spi_nor *nor, const u8 opcode, const unsigned int addr) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; void __iomem *reg_base = cqspi->iobase; unsigned int reg; reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB; reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB); reg |= ((nor->addr_width - 1) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK) << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB; writel(addr, reg_base + CQSPI_REG_CMDADDRESS); return cqspi_exec_flash_cmd(cqspi, reg); } static int cqspi_indirect_read_setup(struct spi_nor *nor, const unsigned int from_addr) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; void __iomem *reg_base = cqspi->iobase; unsigned int dummy_clk = 0; unsigned int reg; writel(from_addr, reg_base + CQSPI_REG_INDIRECTRDSTARTADDR); reg = nor->read_opcode << CQSPI_REG_RD_INSTR_OPCODE_LSB; reg |= cqspi_calc_rdreg(nor, nor->read_opcode); /* Setup dummy clock cycles */ dummy_clk = nor->read_dummy; if (dummy_clk > CQSPI_DUMMY_CLKS_MAX) return -EOPNOTSUPP; if (dummy_clk / 8) { reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB); /* Set mode bits high to ensure chip doesn't enter XIP */ writel(0xFF, reg_base + CQSPI_REG_MODE_BIT); /* Need to subtract the mode byte (8 clocks). */ if (f_pdata->inst_width != CQSPI_INST_TYPE_QUAD) dummy_clk -= 8; if (dummy_clk) reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK) << CQSPI_REG_RD_INSTR_DUMMY_LSB; } writel(reg, reg_base + CQSPI_REG_RD_INSTR); /* Set address width */ reg = readl(reg_base + CQSPI_REG_SIZE); reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; reg |= (nor->addr_width - 1); writel(reg, reg_base + CQSPI_REG_SIZE); return 0; } static int cqspi_indirect_read_execute(struct spi_nor *nor, u8 *rxbuf, const unsigned n_rx) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; void __iomem *reg_base = cqspi->iobase; void __iomem *ahb_base = cqspi->ahb_base; unsigned int remaining = n_rx; unsigned int bytes_to_read = 0; int ret = 0; writel(remaining, reg_base + CQSPI_REG_INDIRECTRDBYTES); /* Clear all interrupts. */ writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS); writel(CQSPI_IRQ_MASK_RD, reg_base + CQSPI_REG_IRQMASK); reinit_completion(&cqspi->transfer_complete); writel(CQSPI_REG_INDIRECTRD_START_MASK, reg_base + CQSPI_REG_INDIRECTRD); while (remaining > 0) { ret = wait_for_completion_timeout(&cqspi->transfer_complete, msecs_to_jiffies (CQSPI_READ_TIMEOUT_MS)); bytes_to_read = cqspi_get_rd_sram_level(cqspi); if (!ret && bytes_to_read == 0) { dev_err(nor->dev, "Indirect read timeout, no bytes\n"); ret = -ETIMEDOUT; goto failrd; } while (bytes_to_read != 0) { bytes_to_read *= cqspi->fifo_width; bytes_to_read = bytes_to_read > remaining ? remaining : bytes_to_read; readsl(ahb_base, rxbuf, DIV_ROUND_UP(bytes_to_read, 4)); rxbuf += bytes_to_read; remaining -= bytes_to_read; bytes_to_read = cqspi_get_rd_sram_level(cqspi); } if (remaining > 0) reinit_completion(&cqspi->transfer_complete); } /* Check indirect done status */ ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTRD, CQSPI_REG_INDIRECTRD_DONE_MASK, 0); if (ret) { dev_err(nor->dev, "Indirect read completion error (%i)\n", ret); goto failrd; } /* Disable interrupt */ writel(0, reg_base + CQSPI_REG_IRQMASK); /* Clear indirect completion status */ writel(CQSPI_REG_INDIRECTRD_DONE_MASK, reg_base + CQSPI_REG_INDIRECTRD); return 0; failrd: /* Disable interrupt */ writel(0, reg_base + CQSPI_REG_IRQMASK); /* Cancel the indirect read */ writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, reg_base + CQSPI_REG_INDIRECTRD); return ret; } static int cqspi_indirect_write_setup(struct spi_nor *nor, const unsigned int to_addr) { unsigned int reg; struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; void __iomem *reg_base = cqspi->iobase; /* Set opcode. */ reg = nor->program_opcode << CQSPI_REG_WR_INSTR_OPCODE_LSB; writel(reg, reg_base + CQSPI_REG_WR_INSTR); reg = cqspi_calc_rdreg(nor, nor->program_opcode); writel(reg, reg_base + CQSPI_REG_RD_INSTR); writel(to_addr, reg_base + CQSPI_REG_INDIRECTWRSTARTADDR); reg = readl(reg_base + CQSPI_REG_SIZE); reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; reg |= (nor->addr_width - 1); writel(reg, reg_base + CQSPI_REG_SIZE); return 0; } static int cqspi_indirect_write_execute(struct spi_nor *nor, const u8 *txbuf, const unsigned n_tx) { const unsigned int page_size = nor->page_size; struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; void __iomem *reg_base = cqspi->iobase; unsigned int remaining = n_tx; unsigned int write_bytes; int ret; writel(remaining, reg_base + CQSPI_REG_INDIRECTWRBYTES); /* Clear all interrupts. */ writel(CQSPI_IRQ_STATUS_MASK, reg_base + CQSPI_REG_IRQSTATUS); writel(CQSPI_IRQ_MASK_WR, reg_base + CQSPI_REG_IRQMASK); reinit_completion(&cqspi->transfer_complete); writel(CQSPI_REG_INDIRECTWR_START_MASK, reg_base + CQSPI_REG_INDIRECTWR); while (remaining > 0) { write_bytes = remaining > page_size ? page_size : remaining; writesl(cqspi->ahb_base, txbuf, DIV_ROUND_UP(write_bytes, 4)); ret = wait_for_completion_timeout(&cqspi->transfer_complete, msecs_to_jiffies (CQSPI_TIMEOUT_MS)); if (!ret) { dev_err(nor->dev, "Indirect write timeout\n"); ret = -ETIMEDOUT; goto failwr; } txbuf += write_bytes; remaining -= write_bytes; if (remaining > 0) reinit_completion(&cqspi->transfer_complete); } /* Check indirect done status */ ret = cqspi_wait_for_bit(reg_base + CQSPI_REG_INDIRECTWR, CQSPI_REG_INDIRECTWR_DONE_MASK, 0); if (ret) { dev_err(nor->dev, "Indirect write completion error (%i)\n", ret); goto failwr; } /* Disable interrupt. */ writel(0, reg_base + CQSPI_REG_IRQMASK); /* Clear indirect completion status */ writel(CQSPI_REG_INDIRECTWR_DONE_MASK, reg_base + CQSPI_REG_INDIRECTWR); cqspi_wait_idle(cqspi); return 0; failwr: /* Disable interrupt. */ writel(0, reg_base + CQSPI_REG_IRQMASK); /* Cancel the indirect write */ writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, reg_base + CQSPI_REG_INDIRECTWR); return ret; } static void cqspi_chipselect(struct spi_nor *nor) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; void __iomem *reg_base = cqspi->iobase; unsigned int chip_select = f_pdata->cs; unsigned int reg; reg = readl(reg_base + CQSPI_REG_CONFIG); if (cqspi->is_decoded_cs) { reg |= CQSPI_REG_CONFIG_DECODE_MASK; } else { reg &= ~CQSPI_REG_CONFIG_DECODE_MASK; /* Convert CS if without decoder. * CS0 to 4b'1110 * CS1 to 4b'1101 * CS2 to 4b'1011 * CS3 to 4b'0111 */ chip_select = 0xF & ~(1 << chip_select); } reg &= ~(CQSPI_REG_CONFIG_CHIPSELECT_MASK << CQSPI_REG_CONFIG_CHIPSELECT_LSB); reg |= (chip_select & CQSPI_REG_CONFIG_CHIPSELECT_MASK) << CQSPI_REG_CONFIG_CHIPSELECT_LSB; writel(reg, reg_base + CQSPI_REG_CONFIG); } static void cqspi_configure_cs_and_sizes(struct spi_nor *nor) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; void __iomem *iobase = cqspi->iobase; unsigned int reg; /* configure page size and block size. */ reg = readl(iobase + CQSPI_REG_SIZE); reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB); reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB); reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; reg |= (nor->page_size << CQSPI_REG_SIZE_PAGE_LSB); reg |= (ilog2(nor->mtd.erasesize) << CQSPI_REG_SIZE_BLOCK_LSB); reg |= (nor->addr_width - 1); writel(reg, iobase + CQSPI_REG_SIZE); /* configure the chip select */ cqspi_chipselect(nor); /* Store the new configuration of the controller */ cqspi->current_page_size = nor->page_size; cqspi->current_erase_size = nor->mtd.erasesize; cqspi->current_addr_width = nor->addr_width; } static unsigned int calculate_ticks_for_ns(const unsigned int ref_clk_hz, const unsigned int ns_val) { unsigned int ticks; ticks = ref_clk_hz / 1000; /* kHz */ ticks = DIV_ROUND_UP(ticks * ns_val, 1000000); return ticks; } static void cqspi_delay(struct spi_nor *nor) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; void __iomem *iobase = cqspi->iobase; const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz; unsigned int tshsl, tchsh, tslch, tsd2d; unsigned int reg; unsigned int tsclk; /* calculate the number of ref ticks for one sclk tick */ tsclk = DIV_ROUND_UP(ref_clk_hz, cqspi->sclk); tshsl = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tshsl_ns); /* this particular value must be at least one sclk */ if (tshsl < tsclk) tshsl = tsclk; tchsh = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tchsh_ns); tslch = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tslch_ns); tsd2d = calculate_ticks_for_ns(ref_clk_hz, f_pdata->tsd2d_ns); reg = (tshsl & CQSPI_REG_DELAY_TSHSL_MASK) << CQSPI_REG_DELAY_TSHSL_LSB; reg |= (tchsh & CQSPI_REG_DELAY_TCHSH_MASK) << CQSPI_REG_DELAY_TCHSH_LSB; reg |= (tslch & CQSPI_REG_DELAY_TSLCH_MASK) << CQSPI_REG_DELAY_TSLCH_LSB; reg |= (tsd2d & CQSPI_REG_DELAY_TSD2D_MASK) << CQSPI_REG_DELAY_TSD2D_LSB; writel(reg, iobase + CQSPI_REG_DELAY); } static void cqspi_config_baudrate_div(struct cqspi_st *cqspi) { const unsigned int ref_clk_hz = cqspi->master_ref_clk_hz; void __iomem *reg_base = cqspi->iobase; u32 reg, div; /* Recalculate the baudrate divisor based on QSPI specification. */ div = DIV_ROUND_UP(ref_clk_hz, 2 * cqspi->sclk) - 1; reg = readl(reg_base + CQSPI_REG_CONFIG); reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB); reg |= (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB; writel(reg, reg_base + CQSPI_REG_CONFIG); } static void cqspi_readdata_capture(struct cqspi_st *cqspi, const unsigned int bypass, const unsigned int delay) { void __iomem *reg_base = cqspi->iobase; unsigned int reg; reg = readl(reg_base + CQSPI_REG_READCAPTURE); if (bypass) reg |= (1 << CQSPI_REG_READCAPTURE_BYPASS_LSB); else reg &= ~(1 << CQSPI_REG_READCAPTURE_BYPASS_LSB); reg &= ~(CQSPI_REG_READCAPTURE_DELAY_MASK << CQSPI_REG_READCAPTURE_DELAY_LSB); reg |= (delay & CQSPI_REG_READCAPTURE_DELAY_MASK) << CQSPI_REG_READCAPTURE_DELAY_LSB; writel(reg, reg_base + CQSPI_REG_READCAPTURE); } static void cqspi_controller_enable(struct cqspi_st *cqspi, bool enable) { void __iomem *reg_base = cqspi->iobase; unsigned int reg; reg = readl(reg_base + CQSPI_REG_CONFIG); if (enable) reg |= CQSPI_REG_CONFIG_ENABLE_MASK; else reg &= ~CQSPI_REG_CONFIG_ENABLE_MASK; writel(reg, reg_base + CQSPI_REG_CONFIG); } static void cqspi_configure(struct spi_nor *nor) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; const unsigned int sclk = f_pdata->clk_rate; int switch_cs = (cqspi->current_cs != f_pdata->cs); int switch_ck = (cqspi->sclk != sclk); if ((cqspi->current_page_size != nor->page_size) || (cqspi->current_erase_size != nor->mtd.erasesize) || (cqspi->current_addr_width != nor->addr_width)) switch_cs = 1; if (switch_cs || switch_ck) cqspi_controller_enable(cqspi, 0); /* Switch chip select. */ if (switch_cs) { cqspi->current_cs = f_pdata->cs; cqspi_configure_cs_and_sizes(nor); } /* Setup baudrate divisor and delays */ if (switch_ck) { cqspi->sclk = sclk; cqspi_config_baudrate_div(cqspi); cqspi_delay(nor); cqspi_readdata_capture(cqspi, 1, f_pdata->read_delay); } if (switch_cs || switch_ck) cqspi_controller_enable(cqspi, 1); } static int cqspi_set_protocol(struct spi_nor *nor, const int read) { struct cqspi_flash_pdata *f_pdata = nor->priv; f_pdata->inst_width = CQSPI_INST_TYPE_SINGLE; f_pdata->addr_width = CQSPI_INST_TYPE_SINGLE; f_pdata->data_width = CQSPI_INST_TYPE_SINGLE; if (read) { switch (nor->flash_read) { case SPI_NOR_NORMAL: case SPI_NOR_FAST: f_pdata->data_width = CQSPI_INST_TYPE_SINGLE; break; case SPI_NOR_DUAL: f_pdata->data_width = CQSPI_INST_TYPE_DUAL; break; case SPI_NOR_QUAD: f_pdata->data_width = CQSPI_INST_TYPE_QUAD; break; default: return -EINVAL; } } cqspi_configure(nor); return 0; } static ssize_t cqspi_write(struct spi_nor *nor, loff_t to, size_t len, const u_char *buf) { int ret; ret = cqspi_set_protocol(nor, 0); if (ret) return ret; ret = cqspi_indirect_write_setup(nor, to); if (ret) return ret; ret = cqspi_indirect_write_execute(nor, buf, len); if (ret) return ret; return (ret < 0) ? ret : len; } static ssize_t cqspi_read(struct spi_nor *nor, loff_t from, size_t len, u_char *buf) { int ret; ret = cqspi_set_protocol(nor, 1); if (ret) return ret; ret = cqspi_indirect_read_setup(nor, from); if (ret) return ret; ret = cqspi_indirect_read_execute(nor, buf, len); if (ret) return ret; return (ret < 0) ? ret : len; } static int cqspi_erase(struct spi_nor *nor, loff_t offs) { int ret; ret = cqspi_set_protocol(nor, 0); if (ret) return ret; /* Send write enable, then erase commands. */ ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0); if (ret) return ret; /* Set up command buffer. */ ret = cqspi_command_write_addr(nor, nor->erase_opcode, offs); if (ret) return ret; return 0; } static int cqspi_prep(struct spi_nor *nor, enum spi_nor_ops ops) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; mutex_lock(&cqspi->bus_mutex); return 0; } static void cqspi_unprep(struct spi_nor *nor, enum spi_nor_ops ops) { struct cqspi_flash_pdata *f_pdata = nor->priv; struct cqspi_st *cqspi = f_pdata->cqspi; mutex_unlock(&cqspi->bus_mutex); } static int cqspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len) { int ret; ret = cqspi_set_protocol(nor, 0); if (!ret) ret = cqspi_command_read(nor, &opcode, 1, buf, len); return ret; } static int cqspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len) { int ret; ret = cqspi_set_protocol(nor, 0); if (!ret) ret = cqspi_command_write(nor, opcode, buf, len); return ret; } static int cqspi_of_get_flash_pdata(struct platform_device *pdev, struct cqspi_flash_pdata *f_pdata, struct device_node *np) { if (of_property_read_u32(np, "cdns,read-delay", &f_pdata->read_delay)) { dev_err(&pdev->dev, "couldn't determine read-delay\n"); return -ENXIO; } if (of_property_read_u32(np, "cdns,tshsl-ns", &f_pdata->tshsl_ns)) { dev_err(&pdev->dev, "couldn't determine tshsl-ns\n"); return -ENXIO; } if (of_property_read_u32(np, "cdns,tsd2d-ns", &f_pdata->tsd2d_ns)) { dev_err(&pdev->dev, "couldn't determine tsd2d-ns\n"); return -ENXIO; } if (of_property_read_u32(np, "cdns,tchsh-ns", &f_pdata->tchsh_ns)) { dev_err(&pdev->dev, "couldn't determine tchsh-ns\n"); return -ENXIO; } if (of_property_read_u32(np, "cdns,tslch-ns", &f_pdata->tslch_ns)) { dev_err(&pdev->dev, "couldn't determine tslch-ns\n"); return -ENXIO; } if (of_property_read_u32(np, "spi-max-frequency", &f_pdata->clk_rate)) { dev_err(&pdev->dev, "couldn't determine spi-max-frequency\n"); return -ENXIO; } return 0; } static int cqspi_of_get_pdata(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct cqspi_st *cqspi = platform_get_drvdata(pdev); cqspi->is_decoded_cs = of_property_read_bool(np, "cdns,is-decoded-cs"); if (of_property_read_u32(np, "cdns,fifo-depth", &cqspi->fifo_depth)) { dev_err(&pdev->dev, "couldn't determine fifo-depth\n"); return -ENXIO; } if (of_property_read_u32(np, "cdns,fifo-width", &cqspi->fifo_width)) { dev_err(&pdev->dev, "couldn't determine fifo-width\n"); return -ENXIO; } if (of_property_read_u32(np, "cdns,trigger-address", &cqspi->trigger_address)) { dev_err(&pdev->dev, "couldn't determine trigger-address\n"); return -ENXIO; } return 0; } static void cqspi_controller_init(struct cqspi_st *cqspi) { cqspi_controller_enable(cqspi, 0); /* Configure the remap address register, no remap */ writel(0, cqspi->iobase + CQSPI_REG_REMAP); /* Disable all interrupts. */ writel(0, cqspi->iobase + CQSPI_REG_IRQMASK); /* Configure the SRAM split to 1:1 . */ writel(cqspi->fifo_depth / 2, cqspi->iobase + CQSPI_REG_SRAMPARTITION); /* Load indirect trigger address. */ writel(cqspi->trigger_address, cqspi->iobase + CQSPI_REG_INDIRECTTRIGGER); /* Program read watermark -- 1/2 of the FIFO. */ writel(cqspi->fifo_depth * cqspi->fifo_width / 2, cqspi->iobase + CQSPI_REG_INDIRECTRDWATERMARK); /* Program write watermark -- 1/8 of the FIFO. */ writel(cqspi->fifo_depth * cqspi->fifo_width / 8, cqspi->iobase + CQSPI_REG_INDIRECTWRWATERMARK); cqspi_controller_enable(cqspi, 1); } static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np) { struct platform_device *pdev = cqspi->pdev; struct device *dev = &pdev->dev; struct cqspi_flash_pdata *f_pdata; struct spi_nor *nor; struct mtd_info *mtd; unsigned int cs; int i, ret; /* Get flash device data */ for_each_available_child_of_node(dev->of_node, np) { ret = of_property_read_u32(np, "reg", &cs); if (ret) { dev_err(dev, "Couldn't determine chip select.\n"); goto err; } if (cs >= CQSPI_MAX_CHIPSELECT) { ret = -EINVAL; dev_err(dev, "Chip select %d out of range.\n", cs); goto err; } f_pdata = &cqspi->f_pdata[cs]; f_pdata->cqspi = cqspi; f_pdata->cs = cs; ret = cqspi_of_get_flash_pdata(pdev, f_pdata, np); if (ret) goto err; nor = &f_pdata->nor; mtd = &nor->mtd; mtd->priv = nor; nor->dev = dev; spi_nor_set_flash_node(nor, np); nor->priv = f_pdata; nor->read_reg = cqspi_read_reg; nor->write_reg = cqspi_write_reg; nor->read = cqspi_read; nor->write = cqspi_write; nor->erase = cqspi_erase; nor->prepare = cqspi_prep; nor->unprepare = cqspi_unprep; mtd->name = devm_kasprintf(dev, GFP_KERNEL, "%s.%d", dev_name(dev), cs); if (!mtd->name) { ret = -ENOMEM; goto err; } ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD); if (ret) goto err; ret = mtd_device_register(mtd, NULL, 0); if (ret) goto err; f_pdata->registered = true; } return 0; err: for (i = 0; i < CQSPI_MAX_CHIPSELECT; i++) if (cqspi->f_pdata[i].registered) mtd_device_unregister(&cqspi->f_pdata[i].nor.mtd); return ret; } static int cqspi_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct device *dev = &pdev->dev; struct cqspi_st *cqspi; struct resource *res; struct resource *res_ahb; int ret; int irq; cqspi = devm_kzalloc(dev, sizeof(*cqspi), GFP_KERNEL); if (!cqspi) return -ENOMEM; mutex_init(&cqspi->bus_mutex); cqspi->pdev = pdev; platform_set_drvdata(pdev, cqspi); /* Obtain configuration from OF. */ ret = cqspi_of_get_pdata(pdev); if (ret) { dev_err(dev, "Cannot get mandatory OF data.\n"); return -ENODEV; } /* Obtain QSPI clock. */ cqspi->clk = devm_clk_get(dev, NULL); if (IS_ERR(cqspi->clk)) { dev_err(dev, "Cannot claim QSPI clock.\n"); return PTR_ERR(cqspi->clk); } /* Obtain and remap controller address. */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); cqspi->iobase = devm_ioremap_resource(dev, res); if (IS_ERR(cqspi->iobase)) { dev_err(dev, "Cannot remap controller address.\n"); return PTR_ERR(cqspi->iobase); } /* Obtain and remap AHB address. */ res_ahb = platform_get_resource(pdev, IORESOURCE_MEM, 1); cqspi->ahb_base = devm_ioremap_resource(dev, res_ahb); if (IS_ERR(cqspi->ahb_base)) { dev_err(dev, "Cannot remap AHB address.\n"); return PTR_ERR(cqspi->ahb_base); } init_completion(&cqspi->transfer_complete); /* Obtain IRQ line. */ irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(dev, "Cannot obtain IRQ.\n"); return -ENXIO; } ret = clk_prepare_enable(cqspi->clk); if (ret) { dev_err(dev, "Cannot enable QSPI clock.\n"); return ret; } cqspi->master_ref_clk_hz = clk_get_rate(cqspi->clk); ret = devm_request_irq(dev, irq, cqspi_irq_handler, 0, pdev->name, cqspi); if (ret) { dev_err(dev, "Cannot request IRQ.\n"); goto probe_irq_failed; } cqspi_wait_idle(cqspi); cqspi_controller_init(cqspi); cqspi->current_cs = -1; cqspi->sclk = 0; ret = cqspi_setup_flash(cqspi, np); if (ret) { dev_err(dev, "Cadence QSPI NOR probe failed %d\n", ret); goto probe_setup_failed; } return ret; probe_irq_failed: cqspi_controller_enable(cqspi, 0); probe_setup_failed: clk_disable_unprepare(cqspi->clk); return ret; } static int cqspi_remove(struct platform_device *pdev) { struct cqspi_st *cqspi = platform_get_drvdata(pdev); int i; for (i = 0; i < CQSPI_MAX_CHIPSELECT; i++) if (cqspi->f_pdata[i].registered) mtd_device_unregister(&cqspi->f_pdata[i].nor.mtd); cqspi_controller_enable(cqspi, 0); clk_disable_unprepare(cqspi->clk); return 0; } #ifdef CONFIG_PM_SLEEP static int cqspi_suspend(struct device *dev) { struct cqspi_st *cqspi = dev_get_drvdata(dev); cqspi_controller_enable(cqspi, 0); return 0; } static int cqspi_resume(struct device *dev) { struct cqspi_st *cqspi = dev_get_drvdata(dev); cqspi_controller_enable(cqspi, 1); return 0; } static const struct dev_pm_ops cqspi__dev_pm_ops = { .suspend = cqspi_suspend, .resume = cqspi_resume, }; #define CQSPI_DEV_PM_OPS (&cqspi__dev_pm_ops) #else #define CQSPI_DEV_PM_OPS NULL #endif static struct of_device_id const cqspi_dt_ids[] = { {.compatible = "cdns,qspi-nor",}, { /* end of table */ } }; MODULE_DEVICE_TABLE(of, cqspi_dt_ids); static struct platform_driver cqspi_platform_driver = { .probe = cqspi_probe, .remove = cqspi_remove, .driver = { .name = CQSPI_NAME, .pm = CQSPI_DEV_PM_OPS, .of_match_table = cqspi_dt_ids, }, }; module_platform_driver(cqspi_platform_driver); MODULE_DESCRIPTION("Cadence QSPI Controller Driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:" CQSPI_NAME); MODULE_AUTHOR("Ley Foon Tan "); MODULE_AUTHOR("Graham Moore ");