diff options
Diffstat (limited to 'drivers/spi/cadence_qspi_apb.c')
| -rw-r--r-- | drivers/spi/cadence_qspi_apb.c | 898 |
1 files changed, 898 insertions, 0 deletions
diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c new file mode 100644 index 0000000000..00a115f3fb --- /dev/null +++ b/drivers/spi/cadence_qspi_apb.c @@ -0,0 +1,898 @@ +/* + * Copyright (C) 2012 Altera Corporation <www.altera.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * - Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * - Neither the name of the Altera Corporation nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL ALTERA CORPORATION BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/errno.h> +#include "cadence_qspi.h" + +#define CQSPI_REG_POLL_US (1) /* 1us */ +#define CQSPI_REG_RETRY (10000) +#define CQSPI_POLL_IDLE_RETRY (3) + +#define CQSPI_FIFO_WIDTH (4) + +/* Controller sram size in word */ +#define CQSPI_REG_SRAM_SIZE_WORD (128) +#define CQSPI_REG_SRAM_RESV_WORDS (2) +#define CQSPI_REG_SRAM_PARTITION_WR (1) +#define CQSPI_REG_SRAM_PARTITION_RD \ + (CQSPI_REG_SRAM_SIZE_WORD - CQSPI_REG_SRAM_RESV_WORDS) +#define CQSPI_REG_SRAM_THRESHOLD_WORDS (50) + +/* Transfer mode */ +#define CQSPI_INST_TYPE_SINGLE (0) +#define CQSPI_INST_TYPE_DUAL (1) +#define CQSPI_INST_TYPE_QUAD (2) + +#define CQSPI_STIG_DATA_LEN_MAX (8) +#define CQSPI_INDIRECTTRIGGER_ADDR_MASK (0xFFFFF) + +#define CQSPI_DUMMY_CLKS_PER_BYTE (8) +#define CQSPI_DUMMY_BYTES_MAX (4) + + +#define CQSPI_REG_SRAM_FILL_THRESHOLD \ + ((CQSPI_REG_SRAM_SIZE_WORD / 2) * CQSPI_FIFO_WIDTH) +/**************************************************************************** + * Controller's configuration and status register (offset from QSPI_BASE) + ****************************************************************************/ +#define CQSPI_REG_CONFIG 0x00 +#define CQSPI_REG_CONFIG_CLK_POL_LSB 1 +#define CQSPI_REG_CONFIG_CLK_PHA_LSB 2 +#define CQSPI_REG_CONFIG_ENABLE_MASK (1 << 0) +#define CQSPI_REG_CONFIG_DIRECT_MASK (1 << 7) +#define CQSPI_REG_CONFIG_DECODE_MASK (1 << 9) +#define CQSPI_REG_CONFIG_XIP_IMM_MASK (1 << 18) +#define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10 +#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_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_READLCAPTURE 0x10 +#define CQSPI_READLCAPTURE_BYPASS_LSB 0 +#define CQSPI_READLCAPTURE_DELAY_LSB 1 +#define CQSPI_READLCAPTURE_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_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 (1 << 0) +#define CQSPI_REG_INDIRECTRD_CANCEL_MASK (1 << 1) +#define CQSPI_REG_INDIRECTRD_INPROGRESS_MASK (1 << 2) +#define CQSPI_REG_INDIRECTRD_DONE_MASK (1 << 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 (1 << 0) +#define CQSPI_REG_CMDCTRL_INPROGRESS_MASK (1 << 1) +#define CQSPI_REG_CMDCTRL_DUMMY_LSB 7 +#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_DUMMY_MASK 0x1F +#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_CMDCTRL_OPCODE_MASK 0xFF + +#define CQSPI_REG_INDIRECTWR 0x70 +#define CQSPI_REG_INDIRECTWR_START_MASK (1 << 0) +#define CQSPI_REG_INDIRECTWR_CANCEL_MASK (1 << 1) +#define CQSPI_REG_INDIRECTWR_INPROGRESS_MASK (1 << 2) +#define CQSPI_REG_INDIRECTWR_DONE_MASK (1 << 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 + +#define CQSPI_REG_IS_IDLE(base) \ + ((readl(base + CQSPI_REG_CONFIG) >> \ + CQSPI_REG_CONFIG_IDLE_LSB) & 0x1) + +#define CQSPI_CAL_DELAY(tdelay_ns, tref_ns, tsclk_ns) \ + ((((tdelay_ns) - (tsclk_ns)) / (tref_ns))) + +#define CQSPI_GET_RD_SRAM_LEVEL(reg_base) \ + (((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \ + CQSPI_REG_SDRAMLEVEL_RD_LSB) & CQSPI_REG_SDRAMLEVEL_RD_MASK) + +#define CQSPI_GET_WR_SRAM_LEVEL(reg_base) \ + (((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \ + CQSPI_REG_SDRAMLEVEL_WR_LSB) & CQSPI_REG_SDRAMLEVEL_WR_MASK) + +static unsigned int cadence_qspi_apb_cmd2addr(const unsigned char *addr_buf, + unsigned int addr_width) +{ + unsigned int addr; + + addr = (addr_buf[0] << 16) | (addr_buf[1] << 8) | addr_buf[2]; + + if (addr_width == 4) + addr = (addr << 8) | addr_buf[3]; + + return addr; +} + +static void cadence_qspi_apb_read_fifo_data(void *dest, + const void *src_ahb_addr, unsigned int bytes) +{ + unsigned int temp; + int remaining = bytes; + unsigned int *dest_ptr = (unsigned int *)dest; + unsigned int *src_ptr = (unsigned int *)src_ahb_addr; + + while (remaining > 0) { + if (remaining >= CQSPI_FIFO_WIDTH) { + *dest_ptr = readl(src_ptr); + remaining -= CQSPI_FIFO_WIDTH; + } else { + /* dangling bytes */ + temp = readl(src_ptr); + memcpy(dest_ptr, &temp, remaining); + break; + } + dest_ptr++; + } + + return; +} + +static void cadence_qspi_apb_write_fifo_data(const void *dest_ahb_addr, + const void *src, unsigned int bytes) +{ + unsigned int temp; + int remaining = bytes; + unsigned int *dest_ptr = (unsigned int *)dest_ahb_addr; + unsigned int *src_ptr = (unsigned int *)src; + + while (remaining > 0) { + if (remaining >= CQSPI_FIFO_WIDTH) { + writel(*src_ptr, dest_ptr); + remaining -= sizeof(unsigned int); + } else { + /* dangling bytes */ + memcpy(&temp, src_ptr, remaining); + writel(temp, dest_ptr); + break; + } + src_ptr++; + } + + return; +} + +/* Read from SRAM FIFO with polling SRAM fill level. */ +static int qspi_read_sram_fifo_poll(const void *reg_base, void *dest_addr, + const void *src_addr, unsigned int num_bytes) +{ + unsigned int remaining = num_bytes; + unsigned int retry; + unsigned int sram_level = 0; + unsigned char *dest = (unsigned char *)dest_addr; + + while (remaining > 0) { + retry = CQSPI_REG_RETRY; + while (retry--) { + sram_level = CQSPI_GET_RD_SRAM_LEVEL(reg_base); + if (sram_level) + break; + udelay(1); + } + + if (!retry) { + printf("QSPI: No receive data after polling for %d times\n", + CQSPI_REG_RETRY); + return -1; + } + + sram_level *= CQSPI_FIFO_WIDTH; + sram_level = sram_level > remaining ? remaining : sram_level; + + /* Read data from FIFO. */ + cadence_qspi_apb_read_fifo_data(dest, src_addr, sram_level); + dest += sram_level; + remaining -= sram_level; + udelay(1); + } + return 0; +} + +/* Write to SRAM FIFO with polling SRAM fill level. */ +static int qpsi_write_sram_fifo_push(struct cadence_spi_platdata *plat, + const void *src_addr, unsigned int num_bytes) +{ + const void *reg_base = plat->regbase; + void *dest_addr = plat->ahbbase; + unsigned int retry = CQSPI_REG_RETRY; + unsigned int sram_level; + unsigned int wr_bytes; + unsigned char *src = (unsigned char *)src_addr; + int remaining = num_bytes; + unsigned int page_size = plat->page_size; + unsigned int sram_threshold_words = CQSPI_REG_SRAM_THRESHOLD_WORDS; + + while (remaining > 0) { + retry = CQSPI_REG_RETRY; + while (retry--) { + sram_level = CQSPI_GET_WR_SRAM_LEVEL(reg_base); + if (sram_level <= sram_threshold_words) + break; + } + if (!retry) { + printf("QSPI: SRAM fill level (0x%08x) not hit lower expected level (0x%08x)", + sram_level, sram_threshold_words); + return -1; + } + /* Write a page or remaining bytes. */ + wr_bytes = (remaining > page_size) ? + page_size : remaining; + + cadence_qspi_apb_write_fifo_data(dest_addr, src, wr_bytes); + src += wr_bytes; + remaining -= wr_bytes; + } + + return 0; +} + +void cadence_qspi_apb_controller_enable(void *reg_base) +{ + unsigned int reg; + reg = readl(reg_base + CQSPI_REG_CONFIG); + reg |= CQSPI_REG_CONFIG_ENABLE_MASK; + writel(reg, reg_base + CQSPI_REG_CONFIG); + return; +} + +void cadence_qspi_apb_controller_disable(void *reg_base) +{ + unsigned int reg; + reg = readl(reg_base + CQSPI_REG_CONFIG); + reg &= ~CQSPI_REG_CONFIG_ENABLE_MASK; + writel(reg, reg_base + CQSPI_REG_CONFIG); + return; +} + +/* Return 1 if idle, otherwise return 0 (busy). */ +static unsigned int cadence_qspi_wait_idle(void *reg_base) +{ + unsigned int start, count = 0; + /* timeout in unit of ms */ + unsigned int timeout = 5000; + + start = get_timer(0); + for ( ; get_timer(start) < timeout ; ) { + if (CQSPI_REG_IS_IDLE(reg_base)) + count++; + else + count = 0; + /* + * Ensure the QSPI controller is in true idle state after + * reading back the same idle status consecutively + */ + if (count >= CQSPI_POLL_IDLE_RETRY) + return 1; + } + + /* Timeout, still in busy mode. */ + printf("QSPI: QSPI is still busy after poll for %d times.\n", + CQSPI_REG_RETRY); + return 0; +} + +void cadence_qspi_apb_readdata_capture(void *reg_base, + unsigned int bypass, unsigned int delay) +{ + unsigned int reg; + cadence_qspi_apb_controller_disable(reg_base); + + reg = readl(reg_base + CQSPI_READLCAPTURE); + + if (bypass) + reg |= (1 << CQSPI_READLCAPTURE_BYPASS_LSB); + else + reg &= ~(1 << CQSPI_READLCAPTURE_BYPASS_LSB); + + reg &= ~(CQSPI_READLCAPTURE_DELAY_MASK + << CQSPI_READLCAPTURE_DELAY_LSB); + + reg |= ((delay & CQSPI_READLCAPTURE_DELAY_MASK) + << CQSPI_READLCAPTURE_DELAY_LSB); + + writel(reg, reg_base + CQSPI_READLCAPTURE); + + cadence_qspi_apb_controller_enable(reg_base); + return; +} + +void cadence_qspi_apb_config_baudrate_div(void *reg_base, + unsigned int ref_clk_hz, unsigned int sclk_hz) +{ + unsigned int reg; + unsigned int div; + + cadence_qspi_apb_controller_disable(reg_base); + reg = readl(reg_base + CQSPI_REG_CONFIG); + reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB); + + div = ref_clk_hz / sclk_hz; + + if (div > 32) + div = 32; + + /* Check if even number. */ + if ((div & 1)) { + div = (div / 2); + } else { + if (ref_clk_hz % sclk_hz) + /* ensure generated SCLK doesn't exceed user + specified sclk_hz */ + div = (div / 2); + else + div = (div / 2) - 1; + } + + debug("%s: ref_clk %dHz sclk %dHz Div 0x%x\n", __func__, + ref_clk_hz, sclk_hz, div); + + div = (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB; + reg |= div; + writel(reg, reg_base + CQSPI_REG_CONFIG); + + cadence_qspi_apb_controller_enable(reg_base); + return; +} + +void cadence_qspi_apb_set_clk_mode(void *reg_base, + unsigned int clk_pol, unsigned int clk_pha) +{ + unsigned int reg; + + cadence_qspi_apb_controller_disable(reg_base); + reg = readl(reg_base + CQSPI_REG_CONFIG); + reg &= ~(1 << + (CQSPI_REG_CONFIG_CLK_POL_LSB | CQSPI_REG_CONFIG_CLK_PHA_LSB)); + + reg |= ((clk_pol & 0x1) << CQSPI_REG_CONFIG_CLK_POL_LSB); + reg |= ((clk_pha & 0x1) << CQSPI_REG_CONFIG_CLK_PHA_LSB); + + writel(reg, reg_base + CQSPI_REG_CONFIG); + + cadence_qspi_apb_controller_enable(reg_base); + return; +} + +void cadence_qspi_apb_chipselect(void *reg_base, + unsigned int chip_select, unsigned int decoder_enable) +{ + unsigned int reg; + + cadence_qspi_apb_controller_disable(reg_base); + + debug("%s : chipselect %d decode %d\n", __func__, chip_select, + decoder_enable); + + reg = readl(reg_base + CQSPI_REG_CONFIG); + /* docoder */ + if (decoder_enable) { + 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); + + cadence_qspi_apb_controller_enable(reg_base); + return; +} + +void cadence_qspi_apb_delay(void *reg_base, + unsigned int ref_clk, unsigned int sclk_hz, + unsigned int tshsl_ns, unsigned int tsd2d_ns, + unsigned int tchsh_ns, unsigned int tslch_ns) +{ + unsigned int ref_clk_ns; + unsigned int sclk_ns; + unsigned int tshsl, tchsh, tslch, tsd2d; + unsigned int reg; + + cadence_qspi_apb_controller_disable(reg_base); + + /* Convert to ns. */ + ref_clk_ns = (1000000000) / ref_clk; + + /* Convert to ns. */ + sclk_ns = (1000000000) / sclk_hz; + + /* Plus 1 to round up 1 clock cycle. */ + tshsl = CQSPI_CAL_DELAY(tshsl_ns, ref_clk_ns, sclk_ns) + 1; + tchsh = CQSPI_CAL_DELAY(tchsh_ns, ref_clk_ns, sclk_ns) + 1; + tslch = CQSPI_CAL_DELAY(tslch_ns, ref_clk_ns, sclk_ns) + 1; + tsd2d = CQSPI_CAL_DELAY(tsd2d_ns, ref_clk_ns, sclk_ns) + 1; + + 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, reg_base + CQSPI_REG_DELAY); + + cadence_qspi_apb_controller_enable(reg_base); + return; +} + +void cadence_qspi_apb_controller_init(struct cadence_spi_platdata *plat) +{ + unsigned reg; + + cadence_qspi_apb_controller_disable(plat->regbase); + + /* Configure the device size and address bytes */ + reg = readl(plat->regbase + CQSPI_REG_SIZE); + /* Clear the previous value */ + reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB); + reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB); + reg |= (plat->page_size << CQSPI_REG_SIZE_PAGE_LSB); + reg |= (plat->block_size << CQSPI_REG_SIZE_BLOCK_LSB); + writel(reg, plat->regbase + CQSPI_REG_SIZE); + + /* Configure the remap address register, no remap */ + writel(0, plat->regbase + CQSPI_REG_REMAP); + + /* Disable all interrupts */ + writel(0, plat->regbase + CQSPI_REG_IRQMASK); + + cadence_qspi_apb_controller_enable(plat->regbase); + return; +} + +static int cadence_qspi_apb_exec_flash_cmd(void *reg_base, + unsigned int reg) +{ + unsigned int retry = CQSPI_REG_RETRY; + + /* 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); + + while (retry--) { + reg = readl(reg_base + CQSPI_REG_CMDCTRL); + if ((reg & CQSPI_REG_CMDCTRL_INPROGRESS_MASK) == 0) + break; + udelay(1); + } + + if (!retry) { + printf("QSPI: flash command execution timeout\n"); + return -EIO; + } + + /* Polling QSPI idle status. */ + if (!cadence_qspi_wait_idle(reg_base)) + return -EIO; + + return 0; +} + +/* For command RDID, RDSR. */ +int cadence_qspi_apb_command_read(void *reg_base, + unsigned int cmdlen, const u8 *cmdbuf, unsigned int rxlen, + u8 *rxbuf) +{ + unsigned int reg; + unsigned int read_len; + int status; + + if (!cmdlen || rxlen > CQSPI_STIG_DATA_LEN_MAX || rxbuf == NULL) { + printf("QSPI: Invalid input arguments cmdlen %d rxlen %d\n", + cmdlen, rxlen); + return -EINVAL; + } + + reg = cmdbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB; + + reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB); + + /* 0 means 1 byte. */ + reg |= (((rxlen - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK) + << CQSPI_REG_CMDCTRL_RD_BYTES_LSB); + status = cadence_qspi_apb_exec_flash_cmd(reg_base, reg); + if (status != 0) + return status; + + reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER); + + /* Put the read value into rx_buf */ + read_len = (rxlen > 4) ? 4 : rxlen; + memcpy(rxbuf, ®, read_len); + rxbuf += read_len; + + if (rxlen > 4) { + reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER); + + read_len = rxlen - read_len; + memcpy(rxbuf, ®, read_len); + } + return 0; +} + +/* For commands: WRSR, WREN, WRDI, CHIP_ERASE, BE, etc. */ +int cadence_qspi_apb_command_write(void *reg_base, unsigned int cmdlen, + const u8 *cmdbuf, unsigned int txlen, const u8 *txbuf) +{ + unsigned int reg = 0; + unsigned int addr_value; + unsigned int wr_data; + unsigned int wr_len; + + if (!cmdlen || cmdlen > 5 || txlen > 8 || cmdbuf == NULL) { + printf("QSPI: Invalid input arguments cmdlen %d txlen %d\n", + cmdlen, txlen); + return -EINVAL; + } + + reg |= cmdbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB; + + if (cmdlen == 4 || cmdlen == 5) { + /* Command with address */ + reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB); + /* Number of bytes to write. */ + reg |= ((cmdlen - 2) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK) + << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB; + /* Get address */ + addr_value = cadence_qspi_apb_cmd2addr(&cmdbuf[1], + cmdlen >= 5 ? 4 : 3); + + writel(addr_value, reg_base + CQSPI_REG_CMDADDRESS); + } + + if (txlen) { + /* writing data = yes */ + reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB); + reg |= ((txlen - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK) + << CQSPI_REG_CMDCTRL_WR_BYTES_LSB; + + wr_len = txlen > 4 ? 4 : txlen; + memcpy(&wr_data, txbuf, wr_len); + writel(wr_data, reg_base + + CQSPI_REG_CMDWRITEDATALOWER); + + if (txlen > 4) { + txbuf += wr_len; + wr_len = txlen - wr_len; + memcpy(&wr_data, txbuf, wr_len); + writel(wr_data, reg_base + + CQSPI_REG_CMDWRITEDATAUPPER); + } + } + + /* Execute the command */ + return cadence_qspi_apb_exec_flash_cmd(reg_base, reg); +} + +/* Opcode + Address (3/4 bytes) + dummy bytes (0-4 bytes) */ +int cadence_qspi_apb_indirect_read_setup(struct cadence_spi_platdata *plat, + unsigned int cmdlen, const u8 *cmdbuf) +{ + unsigned int reg; + unsigned int rd_reg; + unsigned int addr_value; + unsigned int dummy_clk; + unsigned int dummy_bytes; + unsigned int addr_bytes; + + /* + * Identify addr_byte. All NOR flash device drivers are using fast read + * which always expecting 1 dummy byte, 1 cmd byte and 3/4 addr byte. + * With that, the length is in value of 5 or 6. Only FRAM chip from + * ramtron using normal read (which won't need dummy byte). + * Unlikely NOR flash using normal read due to performance issue. + */ + if (cmdlen >= 5) + /* to cater fast read where cmd + addr + dummy */ + addr_bytes = cmdlen - 2; + else + /* for normal read (only ramtron as of now) */ + addr_bytes = cmdlen - 1; + + /* Setup the indirect trigger address */ + writel(((u32)plat->ahbbase & CQSPI_INDIRECTTRIGGER_ADDR_MASK), + plat->regbase + CQSPI_REG_INDIRECTTRIGGER); + + /* Configure SRAM partition for read. */ + writel(CQSPI_REG_SRAM_PARTITION_RD, plat->regbase + + CQSPI_REG_SRAMPARTITION); + + /* Configure the opcode */ + rd_reg = cmdbuf[0] << CQSPI_REG_RD_INSTR_OPCODE_LSB; + +#if (CONFIG_SPI_FLASH_QUAD == 1) + /* Instruction and address at DQ0, data at DQ0-3. */ + rd_reg |= CQSPI_INST_TYPE_QUAD << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB; +#endif + + /* Get address */ + addr_value = cadence_qspi_apb_cmd2addr(&cmdbuf[1], addr_bytes); + writel(addr_value, plat->regbase + CQSPI_REG_INDIRECTRDSTARTADDR); + + /* The remaining lenght is dummy bytes. */ + dummy_bytes = cmdlen - addr_bytes - 1; + if (dummy_bytes) { + if (dummy_bytes > CQSPI_DUMMY_BYTES_MAX) + dummy_bytes = CQSPI_DUMMY_BYTES_MAX; + + rd_reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB); +#if defined(CONFIG_SPL_SPI_XIP) && defined(CONFIG_SPL_BUILD) + writel(0x0, plat->regbase + CQSPI_REG_MODE_BIT); +#else + writel(0xFF, plat->regbase + CQSPI_REG_MODE_BIT); +#endif + + /* Convert to clock cycles. */ + dummy_clk = dummy_bytes * CQSPI_DUMMY_CLKS_PER_BYTE; + /* Need to minus the mode byte (8 clocks). */ + dummy_clk -= CQSPI_DUMMY_CLKS_PER_BYTE; + + if (dummy_clk) + rd_reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK) + << CQSPI_REG_RD_INSTR_DUMMY_LSB; + } + + writel(rd_reg, plat->regbase + CQSPI_REG_RD_INSTR); + + /* set device size */ + reg = readl(plat->regbase + CQSPI_REG_SIZE); + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; + reg |= (addr_bytes - 1); + writel(reg, plat->regbase + CQSPI_REG_SIZE); + return 0; +} + +int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat, + unsigned int rxlen, u8 *rxbuf) +{ + unsigned int reg; + + writel(rxlen, plat->regbase + CQSPI_REG_INDIRECTRDBYTES); + + /* Start the indirect read transfer */ + writel(CQSPI_REG_INDIRECTRD_START_MASK, + plat->regbase + CQSPI_REG_INDIRECTRD); + + if (qspi_read_sram_fifo_poll(plat->regbase, (void *)rxbuf, + (const void *)plat->ahbbase, rxlen)) + goto failrd; + + /* Check flash indirect controller */ + reg = readl(plat->regbase + CQSPI_REG_INDIRECTRD); + if (!(reg & CQSPI_REG_INDIRECTRD_DONE_MASK)) { + reg = readl(plat->regbase + CQSPI_REG_INDIRECTRD); + printf("QSPI: indirect completion status error with reg 0x%08x\n", + reg); + goto failrd; + } + + /* Clear indirect completion status */ + writel(CQSPI_REG_INDIRECTRD_DONE_MASK, + plat->regbase + CQSPI_REG_INDIRECTRD); + return 0; + +failrd: + /* Cancel the indirect read */ + writel(CQSPI_REG_INDIRECTRD_CANCEL_MASK, + plat->regbase + CQSPI_REG_INDIRECTRD); + return -1; +} + +/* Opcode + Address (3/4 bytes) */ +int cadence_qspi_apb_indirect_write_setup(struct cadence_spi_platdata *plat, + unsigned int cmdlen, const u8 *cmdbuf) +{ + unsigned int reg; + unsigned int addr_bytes = cmdlen > 4 ? 4 : 3; + + if (cmdlen < 4 || cmdbuf == NULL) { + printf("QSPI: iInvalid input argument, len %d cmdbuf 0x%08x\n", + cmdlen, (unsigned int)cmdbuf); + return -EINVAL; + } + /* Setup the indirect trigger address */ + writel(((u32)plat->ahbbase & CQSPI_INDIRECTTRIGGER_ADDR_MASK), + plat->regbase + CQSPI_REG_INDIRECTTRIGGER); + + writel(CQSPI_REG_SRAM_PARTITION_WR, + plat->regbase + CQSPI_REG_SRAMPARTITION); + + /* Configure the opcode */ + reg = cmdbuf[0] << CQSPI_REG_WR_INSTR_OPCODE_LSB; + writel(reg, plat->regbase + CQSPI_REG_WR_INSTR); + + /* Setup write address. */ + reg = cadence_qspi_apb_cmd2addr(&cmdbuf[1], addr_bytes); + writel(reg, plat->regbase + CQSPI_REG_INDIRECTWRSTARTADDR); + + reg = readl(plat->regbase + CQSPI_REG_SIZE); + reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK; + reg |= (addr_bytes - 1); + writel(reg, plat->regbase + CQSPI_REG_SIZE); + return 0; +} + +int cadence_qspi_apb_indirect_write_execute(struct cadence_spi_platdata *plat, + unsigned int txlen, const u8 *txbuf) +{ + unsigned int reg = 0; + unsigned int retry; + + /* Configure the indirect read transfer bytes */ + writel(txlen, plat->regbase + CQSPI_REG_INDIRECTWRBYTES); + + /* Start the indirect write transfer */ + writel(CQSPI_REG_INDIRECTWR_START_MASK, + plat->regbase + CQSPI_REG_INDIRECTWR); + + if (qpsi_write_sram_fifo_push(plat, (const void *)txbuf, txlen)) + goto failwr; + + /* Wait until last write is completed (FIFO empty) */ + retry = CQSPI_REG_RETRY; + while (retry--) { + reg = CQSPI_GET_WR_SRAM_LEVEL(plat->regbase); + if (reg == 0) + break; + + udelay(1); + } + + if (reg != 0) { + printf("QSPI: timeout for indirect write\n"); + goto failwr; + } + + /* Check flash indirect controller status */ + retry = CQSPI_REG_RETRY; + while (retry--) { + reg = readl(plat->regbase + CQSPI_REG_INDIRECTWR); + if (reg & CQSPI_REG_INDIRECTWR_DONE_MASK) + break; + udelay(1); + } + + if (!(reg & CQSPI_REG_INDIRECTWR_DONE_MASK)) { + printf("QSPI: indirect completion status error with reg 0x%08x\n", + reg); + goto failwr; + } + + /* Clear indirect completion status */ + writel(CQSPI_REG_INDIRECTWR_DONE_MASK, + plat->regbase + CQSPI_REG_INDIRECTWR); + return 0; + +failwr: + /* Cancel the indirect write */ + writel(CQSPI_REG_INDIRECTWR_CANCEL_MASK, + plat->regbase + CQSPI_REG_INDIRECTWR); + return -1; +} + +void cadence_qspi_apb_enter_xip(void *reg_base, char xip_dummy) +{ + unsigned int reg; + + /* enter XiP mode immediately and enable direct mode */ + reg = readl(reg_base + CQSPI_REG_CONFIG); + reg |= CQSPI_REG_CONFIG_ENABLE_MASK; + reg |= CQSPI_REG_CONFIG_DIRECT_MASK; + reg |= CQSPI_REG_CONFIG_XIP_IMM_MASK; + writel(reg, reg_base + CQSPI_REG_CONFIG); + + /* keep the XiP mode */ + writel(xip_dummy, reg_base + CQSPI_REG_MODE_BIT); + + /* Enable mode bit at devrd */ + reg = readl(reg_base + CQSPI_REG_RD_INSTR); + reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB); + writel(reg, reg_base + CQSPI_REG_RD_INSTR); +} |
