| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Renesas RPC-IF core driver |
| * |
| * Copyright (C) 2018-2019 Renesas Solutions Corp. |
| * Copyright (C) 2019 Macronix International Co., Ltd. |
| * Copyright (C) 2019-2020 Cogent Embedded, Inc. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/regmap.h> |
| #include <linux/reset.h> |
| |
| #include <memory/renesas-rpc-if.h> |
| |
| #define RPCIF_CMNCR 0x0000 /* R/W */ |
| #define RPCIF_CMNCR_MD BIT(31) |
| #define RPCIF_CMNCR_MOIIO3(val) (((val) & 0x3) << 22) |
| #define RPCIF_CMNCR_MOIIO2(val) (((val) & 0x3) << 20) |
| #define RPCIF_CMNCR_MOIIO1(val) (((val) & 0x3) << 18) |
| #define RPCIF_CMNCR_MOIIO0(val) (((val) & 0x3) << 16) |
| #define RPCIF_CMNCR_MOIIO(val) (RPCIF_CMNCR_MOIIO0(val) | RPCIF_CMNCR_MOIIO1(val) | \ |
| RPCIF_CMNCR_MOIIO2(val) | RPCIF_CMNCR_MOIIO3(val)) |
| #define RPCIF_CMNCR_IO3FV(val) (((val) & 0x3) << 14) /* documented for RZ/G2L */ |
| #define RPCIF_CMNCR_IO2FV(val) (((val) & 0x3) << 12) /* documented for RZ/G2L */ |
| #define RPCIF_CMNCR_IO0FV(val) (((val) & 0x3) << 8) |
| #define RPCIF_CMNCR_IOFV(val) (RPCIF_CMNCR_IO0FV(val) | RPCIF_CMNCR_IO2FV(val) | \ |
| RPCIF_CMNCR_IO3FV(val)) |
| #define RPCIF_CMNCR_BSZ(val) (((val) & 0x3) << 0) |
| |
| #define RPCIF_SSLDR 0x0004 /* R/W */ |
| #define RPCIF_SSLDR_SPNDL(d) (((d) & 0x7) << 16) |
| #define RPCIF_SSLDR_SLNDL(d) (((d) & 0x7) << 8) |
| #define RPCIF_SSLDR_SCKDL(d) (((d) & 0x7) << 0) |
| |
| #define RPCIF_DRCR 0x000C /* R/W */ |
| #define RPCIF_DRCR_SSLN BIT(24) |
| #define RPCIF_DRCR_RBURST(v) ((((v) - 1) & 0x1F) << 16) |
| #define RPCIF_DRCR_RCF BIT(9) |
| #define RPCIF_DRCR_RBE BIT(8) |
| #define RPCIF_DRCR_SSLE BIT(0) |
| |
| #define RPCIF_DRCMR 0x0010 /* R/W */ |
| #define RPCIF_DRCMR_CMD(c) (((c) & 0xFF) << 16) |
| #define RPCIF_DRCMR_OCMD(c) (((c) & 0xFF) << 0) |
| |
| #define RPCIF_DREAR 0x0014 /* R/W */ |
| #define RPCIF_DREAR_EAV(c) (((c) & 0xF) << 16) |
| #define RPCIF_DREAR_EAC(c) (((c) & 0x7) << 0) |
| |
| #define RPCIF_DROPR 0x0018 /* R/W */ |
| |
| #define RPCIF_DRENR 0x001C /* R/W */ |
| #define RPCIF_DRENR_CDB(o) (u32)((((o) & 0x3) << 30)) |
| #define RPCIF_DRENR_OCDB(o) (((o) & 0x3) << 28) |
| #define RPCIF_DRENR_ADB(o) (((o) & 0x3) << 24) |
| #define RPCIF_DRENR_OPDB(o) (((o) & 0x3) << 20) |
| #define RPCIF_DRENR_DRDB(o) (((o) & 0x3) << 16) |
| #define RPCIF_DRENR_DME BIT(15) |
| #define RPCIF_DRENR_CDE BIT(14) |
| #define RPCIF_DRENR_OCDE BIT(12) |
| #define RPCIF_DRENR_ADE(v) (((v) & 0xF) << 8) |
| #define RPCIF_DRENR_OPDE(v) (((v) & 0xF) << 4) |
| |
| #define RPCIF_SMCR 0x0020 /* R/W */ |
| #define RPCIF_SMCR_SSLKP BIT(8) |
| #define RPCIF_SMCR_SPIRE BIT(2) |
| #define RPCIF_SMCR_SPIWE BIT(1) |
| #define RPCIF_SMCR_SPIE BIT(0) |
| |
| #define RPCIF_SMCMR 0x0024 /* R/W */ |
| #define RPCIF_SMCMR_CMD(c) (((c) & 0xFF) << 16) |
| #define RPCIF_SMCMR_OCMD(c) (((c) & 0xFF) << 0) |
| |
| #define RPCIF_SMADR 0x0028 /* R/W */ |
| |
| #define RPCIF_SMOPR 0x002C /* R/W */ |
| #define RPCIF_SMOPR_OPD3(o) (((o) & 0xFF) << 24) |
| #define RPCIF_SMOPR_OPD2(o) (((o) & 0xFF) << 16) |
| #define RPCIF_SMOPR_OPD1(o) (((o) & 0xFF) << 8) |
| #define RPCIF_SMOPR_OPD0(o) (((o) & 0xFF) << 0) |
| |
| #define RPCIF_SMENR 0x0030 /* R/W */ |
| #define RPCIF_SMENR_CDB(o) (((o) & 0x3) << 30) |
| #define RPCIF_SMENR_OCDB(o) (((o) & 0x3) << 28) |
| #define RPCIF_SMENR_ADB(o) (((o) & 0x3) << 24) |
| #define RPCIF_SMENR_OPDB(o) (((o) & 0x3) << 20) |
| #define RPCIF_SMENR_SPIDB(o) (((o) & 0x3) << 16) |
| #define RPCIF_SMENR_DME BIT(15) |
| #define RPCIF_SMENR_CDE BIT(14) |
| #define RPCIF_SMENR_OCDE BIT(12) |
| #define RPCIF_SMENR_ADE(v) (((v) & 0xF) << 8) |
| #define RPCIF_SMENR_OPDE(v) (((v) & 0xF) << 4) |
| #define RPCIF_SMENR_SPIDE(v) (((v) & 0xF) << 0) |
| |
| #define RPCIF_SMRDR0 0x0038 /* R */ |
| #define RPCIF_SMRDR1 0x003C /* R */ |
| #define RPCIF_SMWDR0 0x0040 /* W */ |
| #define RPCIF_SMWDR1 0x0044 /* W */ |
| |
| #define RPCIF_CMNSR 0x0048 /* R */ |
| #define RPCIF_CMNSR_SSLF BIT(1) |
| #define RPCIF_CMNSR_TEND BIT(0) |
| |
| #define RPCIF_DRDMCR 0x0058 /* R/W */ |
| #define RPCIF_DMDMCR_DMCYC(v) ((((v) - 1) & 0x1F) << 0) |
| |
| #define RPCIF_DRDRENR 0x005C /* R/W */ |
| #define RPCIF_DRDRENR_HYPE(v) (((v) & 0x7) << 12) |
| #define RPCIF_DRDRENR_ADDRE BIT(8) |
| #define RPCIF_DRDRENR_OPDRE BIT(4) |
| #define RPCIF_DRDRENR_DRDRE BIT(0) |
| |
| #define RPCIF_SMDMCR 0x0060 /* R/W */ |
| #define RPCIF_SMDMCR_DMCYC(v) ((((v) - 1) & 0x1F) << 0) |
| |
| #define RPCIF_SMDRENR 0x0064 /* R/W */ |
| #define RPCIF_SMDRENR_HYPE(v) (((v) & 0x7) << 12) |
| #define RPCIF_SMDRENR_ADDRE BIT(8) |
| #define RPCIF_SMDRENR_OPDRE BIT(4) |
| #define RPCIF_SMDRENR_SPIDRE BIT(0) |
| |
| #define RPCIF_PHYADD 0x0070 /* R/W available on R-Car E3/D3/V3M and RZ/G2{E,L} */ |
| #define RPCIF_PHYWR 0x0074 /* R/W available on R-Car E3/D3/V3M and RZ/G2{E,L} */ |
| |
| #define RPCIF_PHYCNT 0x007C /* R/W */ |
| #define RPCIF_PHYCNT_CAL BIT(31) |
| #define RPCIF_PHYCNT_OCTA(v) (((v) & 0x3) << 22) |
| #define RPCIF_PHYCNT_EXDS BIT(21) |
| #define RPCIF_PHYCNT_OCT BIT(20) |
| #define RPCIF_PHYCNT_DDRCAL BIT(19) |
| #define RPCIF_PHYCNT_HS BIT(18) |
| #define RPCIF_PHYCNT_CKSEL(v) (((v) & 0x3) << 16) /* valid only for RZ/G2L */ |
| #define RPCIF_PHYCNT_STRTIM(v) (((v) & 0x7) << 15 | ((v) & 0x8) << 24) /* valid for R-Car and RZ/G2{E,H,M,N} */ |
| |
| #define RPCIF_PHYCNT_WBUF2 BIT(4) |
| #define RPCIF_PHYCNT_WBUF BIT(2) |
| #define RPCIF_PHYCNT_PHYMEM(v) (((v) & 0x3) << 0) |
| #define RPCIF_PHYCNT_PHYMEM_MASK GENMASK(1, 0) |
| |
| #define RPCIF_PHYOFFSET1 0x0080 /* R/W */ |
| #define RPCIF_PHYOFFSET1_DDRTMG(v) (((v) & 0x3) << 28) |
| |
| #define RPCIF_PHYOFFSET2 0x0084 /* R/W */ |
| #define RPCIF_PHYOFFSET2_OCTTMG(v) (((v) & 0x7) << 8) |
| |
| #define RPCIF_PHYINT 0x0088 /* R/W */ |
| #define RPCIF_PHYINT_WPVAL BIT(1) |
| |
| static const struct regmap_range rpcif_volatile_ranges[] = { |
| regmap_reg_range(RPCIF_SMRDR0, RPCIF_SMRDR1), |
| regmap_reg_range(RPCIF_SMWDR0, RPCIF_SMWDR1), |
| regmap_reg_range(RPCIF_CMNSR, RPCIF_CMNSR), |
| }; |
| |
| static const struct regmap_access_table rpcif_volatile_table = { |
| .yes_ranges = rpcif_volatile_ranges, |
| .n_yes_ranges = ARRAY_SIZE(rpcif_volatile_ranges), |
| }; |
| |
| struct rpcif_priv { |
| struct device *dev; |
| void __iomem *base; |
| void __iomem *dirmap; |
| struct regmap *regmap; |
| struct reset_control *rstc; |
| struct platform_device *vdev; |
| size_t size; |
| enum rpcif_type type; |
| enum rpcif_data_dir dir; |
| u8 bus_size; |
| u8 xfer_size; |
| void *buffer; |
| u32 xferlen; |
| u32 smcr; |
| u32 smadr; |
| u32 command; /* DRCMR or SMCMR */ |
| u32 option; /* DROPR or SMOPR */ |
| u32 enable; /* DRENR or SMENR */ |
| u32 dummy; /* DRDMCR or SMDMCR */ |
| u32 ddr; /* DRDRENR or SMDRENR */ |
| }; |
| |
| /* |
| * Custom accessor functions to ensure SM[RW]DR[01] are always accessed with |
| * proper width. Requires rpcif_priv.xfer_size to be correctly set before! |
| */ |
| static int rpcif_reg_read(void *context, unsigned int reg, unsigned int *val) |
| { |
| struct rpcif_priv *rpc = context; |
| |
| switch (reg) { |
| case RPCIF_SMRDR0: |
| case RPCIF_SMWDR0: |
| switch (rpc->xfer_size) { |
| case 1: |
| *val = readb(rpc->base + reg); |
| return 0; |
| |
| case 2: |
| *val = readw(rpc->base + reg); |
| return 0; |
| |
| case 4: |
| case 8: |
| *val = readl(rpc->base + reg); |
| return 0; |
| |
| default: |
| return -EILSEQ; |
| } |
| |
| case RPCIF_SMRDR1: |
| case RPCIF_SMWDR1: |
| if (rpc->xfer_size != 8) |
| return -EILSEQ; |
| break; |
| } |
| |
| *val = readl(rpc->base + reg); |
| return 0; |
| } |
| |
| static int rpcif_reg_write(void *context, unsigned int reg, unsigned int val) |
| { |
| struct rpcif_priv *rpc = context; |
| |
| switch (reg) { |
| case RPCIF_SMWDR0: |
| switch (rpc->xfer_size) { |
| case 1: |
| writeb(val, rpc->base + reg); |
| return 0; |
| |
| case 2: |
| writew(val, rpc->base + reg); |
| return 0; |
| |
| case 4: |
| case 8: |
| writel(val, rpc->base + reg); |
| return 0; |
| |
| default: |
| return -EILSEQ; |
| } |
| |
| case RPCIF_SMWDR1: |
| if (rpc->xfer_size != 8) |
| return -EILSEQ; |
| break; |
| |
| case RPCIF_SMRDR0: |
| case RPCIF_SMRDR1: |
| return -EPERM; |
| } |
| |
| writel(val, rpc->base + reg); |
| return 0; |
| } |
| |
| static const struct regmap_config rpcif_regmap_config = { |
| .reg_bits = 32, |
| .val_bits = 32, |
| .reg_stride = 4, |
| .reg_read = rpcif_reg_read, |
| .reg_write = rpcif_reg_write, |
| .fast_io = true, |
| .max_register = RPCIF_PHYINT, |
| .volatile_table = &rpcif_volatile_table, |
| }; |
| |
| int rpcif_sw_init(struct rpcif *rpcif, struct device *dev) |
| { |
| struct rpcif_priv *rpc = dev_get_drvdata(dev); |
| |
| rpcif->dev = dev; |
| rpcif->dirmap = rpc->dirmap; |
| rpcif->size = rpc->size; |
| return 0; |
| } |
| EXPORT_SYMBOL(rpcif_sw_init); |
| |
| static void rpcif_rzg2l_timing_adjust_sdr(struct rpcif_priv *rpc) |
| { |
| regmap_write(rpc->regmap, RPCIF_PHYWR, 0xa5390000); |
| regmap_write(rpc->regmap, RPCIF_PHYADD, 0x80000000); |
| regmap_write(rpc->regmap, RPCIF_PHYWR, 0x00008080); |
| regmap_write(rpc->regmap, RPCIF_PHYADD, 0x80000022); |
| regmap_write(rpc->regmap, RPCIF_PHYWR, 0x00008080); |
| regmap_write(rpc->regmap, RPCIF_PHYADD, 0x80000024); |
| regmap_update_bits(rpc->regmap, RPCIF_PHYCNT, RPCIF_PHYCNT_CKSEL(3), |
| RPCIF_PHYCNT_CKSEL(3)); |
| regmap_write(rpc->regmap, RPCIF_PHYWR, 0x00000030); |
| regmap_write(rpc->regmap, RPCIF_PHYADD, 0x80000032); |
| } |
| |
| int rpcif_hw_init(struct device *dev, bool hyperflash) |
| { |
| struct rpcif_priv *rpc = dev_get_drvdata(dev); |
| u32 dummy; |
| int ret; |
| |
| ret = pm_runtime_resume_and_get(dev); |
| if (ret) |
| return ret; |
| |
| if (rpc->type == RPCIF_RZ_G2L) { |
| ret = reset_control_reset(rpc->rstc); |
| if (ret) |
| return ret; |
| usleep_range(200, 300); |
| rpcif_rzg2l_timing_adjust_sdr(rpc); |
| } |
| |
| regmap_update_bits(rpc->regmap, RPCIF_PHYCNT, RPCIF_PHYCNT_PHYMEM_MASK, |
| RPCIF_PHYCNT_PHYMEM(hyperflash ? 3 : 0)); |
| |
| /* DMA Transfer is not supported */ |
| regmap_update_bits(rpc->regmap, RPCIF_PHYCNT, RPCIF_PHYCNT_HS, 0); |
| |
| if (rpc->type == RPCIF_RCAR_GEN3) |
| regmap_update_bits(rpc->regmap, RPCIF_PHYCNT, |
| RPCIF_PHYCNT_STRTIM(7), RPCIF_PHYCNT_STRTIM(7)); |
| else if (rpc->type == RPCIF_RCAR_GEN4) |
| regmap_update_bits(rpc->regmap, RPCIF_PHYCNT, |
| RPCIF_PHYCNT_STRTIM(15), RPCIF_PHYCNT_STRTIM(15)); |
| |
| regmap_update_bits(rpc->regmap, RPCIF_PHYOFFSET1, RPCIF_PHYOFFSET1_DDRTMG(3), |
| RPCIF_PHYOFFSET1_DDRTMG(3)); |
| regmap_update_bits(rpc->regmap, RPCIF_PHYOFFSET2, RPCIF_PHYOFFSET2_OCTTMG(7), |
| RPCIF_PHYOFFSET2_OCTTMG(4)); |
| |
| if (hyperflash) |
| regmap_update_bits(rpc->regmap, RPCIF_PHYINT, |
| RPCIF_PHYINT_WPVAL, 0); |
| |
| if (rpc->type == RPCIF_RZ_G2L) |
| regmap_update_bits(rpc->regmap, RPCIF_CMNCR, |
| RPCIF_CMNCR_MOIIO(3) | RPCIF_CMNCR_IOFV(3) | |
| RPCIF_CMNCR_BSZ(3), |
| RPCIF_CMNCR_MOIIO(1) | RPCIF_CMNCR_IOFV(2) | |
| RPCIF_CMNCR_BSZ(hyperflash ? 1 : 0)); |
| else |
| regmap_update_bits(rpc->regmap, RPCIF_CMNCR, |
| RPCIF_CMNCR_MOIIO(3) | RPCIF_CMNCR_BSZ(3), |
| RPCIF_CMNCR_MOIIO(3) | |
| RPCIF_CMNCR_BSZ(hyperflash ? 1 : 0)); |
| |
| /* Set RCF after BSZ update */ |
| regmap_write(rpc->regmap, RPCIF_DRCR, RPCIF_DRCR_RCF); |
| /* Dummy read according to spec */ |
| regmap_read(rpc->regmap, RPCIF_DRCR, &dummy); |
| regmap_write(rpc->regmap, RPCIF_SSLDR, RPCIF_SSLDR_SPNDL(7) | |
| RPCIF_SSLDR_SLNDL(7) | RPCIF_SSLDR_SCKDL(7)); |
| |
| pm_runtime_put(dev); |
| |
| rpc->bus_size = hyperflash ? 2 : 1; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(rpcif_hw_init); |
| |
| static int wait_msg_xfer_end(struct rpcif_priv *rpc) |
| { |
| u32 sts; |
| |
| return regmap_read_poll_timeout(rpc->regmap, RPCIF_CMNSR, sts, |
| sts & RPCIF_CMNSR_TEND, 0, |
| USEC_PER_SEC); |
| } |
| |
| static u8 rpcif_bits_set(struct rpcif_priv *rpc, u32 nbytes) |
| { |
| if (rpc->bus_size == 2) |
| nbytes /= 2; |
| nbytes = clamp(nbytes, 1U, 4U); |
| return GENMASK(3, 4 - nbytes); |
| } |
| |
| static u8 rpcif_bit_size(u8 buswidth) |
| { |
| return buswidth > 4 ? 2 : ilog2(buswidth); |
| } |
| |
| void rpcif_prepare(struct device *dev, const struct rpcif_op *op, u64 *offs, |
| size_t *len) |
| { |
| struct rpcif_priv *rpc = dev_get_drvdata(dev); |
| |
| rpc->smcr = 0; |
| rpc->smadr = 0; |
| rpc->enable = 0; |
| rpc->command = 0; |
| rpc->option = 0; |
| rpc->dummy = 0; |
| rpc->ddr = 0; |
| rpc->xferlen = 0; |
| |
| if (op->cmd.buswidth) { |
| rpc->enable = RPCIF_SMENR_CDE | |
| RPCIF_SMENR_CDB(rpcif_bit_size(op->cmd.buswidth)); |
| rpc->command = RPCIF_SMCMR_CMD(op->cmd.opcode); |
| if (op->cmd.ddr) |
| rpc->ddr = RPCIF_SMDRENR_HYPE(0x5); |
| } |
| if (op->ocmd.buswidth) { |
| rpc->enable |= RPCIF_SMENR_OCDE | |
| RPCIF_SMENR_OCDB(rpcif_bit_size(op->ocmd.buswidth)); |
| rpc->command |= RPCIF_SMCMR_OCMD(op->ocmd.opcode); |
| } |
| |
| if (op->addr.buswidth) { |
| rpc->enable |= |
| RPCIF_SMENR_ADB(rpcif_bit_size(op->addr.buswidth)); |
| if (op->addr.nbytes == 4) |
| rpc->enable |= RPCIF_SMENR_ADE(0xF); |
| else |
| rpc->enable |= RPCIF_SMENR_ADE(GENMASK( |
| 2, 3 - op->addr.nbytes)); |
| if (op->addr.ddr) |
| rpc->ddr |= RPCIF_SMDRENR_ADDRE; |
| |
| if (offs && len) |
| rpc->smadr = *offs; |
| else |
| rpc->smadr = op->addr.val; |
| } |
| |
| if (op->dummy.buswidth) { |
| rpc->enable |= RPCIF_SMENR_DME; |
| rpc->dummy = RPCIF_SMDMCR_DMCYC(op->dummy.ncycles); |
| } |
| |
| if (op->option.buswidth) { |
| rpc->enable |= RPCIF_SMENR_OPDE( |
| rpcif_bits_set(rpc, op->option.nbytes)) | |
| RPCIF_SMENR_OPDB(rpcif_bit_size(op->option.buswidth)); |
| if (op->option.ddr) |
| rpc->ddr |= RPCIF_SMDRENR_OPDRE; |
| rpc->option = op->option.val; |
| } |
| |
| rpc->dir = op->data.dir; |
| if (op->data.buswidth) { |
| u32 nbytes; |
| |
| rpc->buffer = op->data.buf.in; |
| switch (op->data.dir) { |
| case RPCIF_DATA_IN: |
| rpc->smcr = RPCIF_SMCR_SPIRE; |
| break; |
| case RPCIF_DATA_OUT: |
| rpc->smcr = RPCIF_SMCR_SPIWE; |
| break; |
| default: |
| break; |
| } |
| if (op->data.ddr) |
| rpc->ddr |= RPCIF_SMDRENR_SPIDRE; |
| |
| if (offs && len) |
| nbytes = *len; |
| else |
| nbytes = op->data.nbytes; |
| rpc->xferlen = nbytes; |
| |
| rpc->enable |= RPCIF_SMENR_SPIDB(rpcif_bit_size(op->data.buswidth)); |
| } |
| } |
| EXPORT_SYMBOL(rpcif_prepare); |
| |
| int rpcif_manual_xfer(struct device *dev) |
| { |
| struct rpcif_priv *rpc = dev_get_drvdata(dev); |
| u32 smenr, smcr, pos = 0, max = rpc->bus_size == 2 ? 8 : 4; |
| int ret = 0; |
| |
| ret = pm_runtime_resume_and_get(dev); |
| if (ret < 0) |
| return ret; |
| |
| regmap_update_bits(rpc->regmap, RPCIF_PHYCNT, |
| RPCIF_PHYCNT_CAL, RPCIF_PHYCNT_CAL); |
| regmap_update_bits(rpc->regmap, RPCIF_CMNCR, |
| RPCIF_CMNCR_MD, RPCIF_CMNCR_MD); |
| regmap_write(rpc->regmap, RPCIF_SMCMR, rpc->command); |
| regmap_write(rpc->regmap, RPCIF_SMOPR, rpc->option); |
| regmap_write(rpc->regmap, RPCIF_SMDMCR, rpc->dummy); |
| regmap_write(rpc->regmap, RPCIF_SMDRENR, rpc->ddr); |
| regmap_write(rpc->regmap, RPCIF_SMADR, rpc->smadr); |
| smenr = rpc->enable; |
| |
| switch (rpc->dir) { |
| case RPCIF_DATA_OUT: |
| while (pos < rpc->xferlen) { |
| u32 bytes_left = rpc->xferlen - pos; |
| u32 nbytes, data[2], *p = data; |
| |
| smcr = rpc->smcr | RPCIF_SMCR_SPIE; |
| |
| /* nbytes may only be 1, 2, 4, or 8 */ |
| nbytes = bytes_left >= max ? max : (1 << ilog2(bytes_left)); |
| if (bytes_left > nbytes) |
| smcr |= RPCIF_SMCR_SSLKP; |
| |
| smenr |= RPCIF_SMENR_SPIDE(rpcif_bits_set(rpc, nbytes)); |
| regmap_write(rpc->regmap, RPCIF_SMENR, smenr); |
| rpc->xfer_size = nbytes; |
| |
| memcpy(data, rpc->buffer + pos, nbytes); |
| if (nbytes == 8) |
| regmap_write(rpc->regmap, RPCIF_SMWDR1, *p++); |
| regmap_write(rpc->regmap, RPCIF_SMWDR0, *p); |
| |
| regmap_write(rpc->regmap, RPCIF_SMCR, smcr); |
| ret = wait_msg_xfer_end(rpc); |
| if (ret) |
| goto err_out; |
| |
| pos += nbytes; |
| smenr = rpc->enable & |
| ~RPCIF_SMENR_CDE & ~RPCIF_SMENR_ADE(0xF); |
| } |
| break; |
| case RPCIF_DATA_IN: |
| /* |
| * RPC-IF spoils the data for the commands without an address |
| * phase (like RDID) in the manual mode, so we'll have to work |
| * around this issue by using the external address space read |
| * mode instead. |
| */ |
| if (!(smenr & RPCIF_SMENR_ADE(0xF)) && rpc->dirmap) { |
| u32 dummy; |
| |
| regmap_update_bits(rpc->regmap, RPCIF_CMNCR, |
| RPCIF_CMNCR_MD, 0); |
| regmap_write(rpc->regmap, RPCIF_DRCR, |
| RPCIF_DRCR_RBURST(32) | RPCIF_DRCR_RBE); |
| regmap_write(rpc->regmap, RPCIF_DRCMR, rpc->command); |
| regmap_write(rpc->regmap, RPCIF_DREAR, |
| RPCIF_DREAR_EAC(1)); |
| regmap_write(rpc->regmap, RPCIF_DROPR, rpc->option); |
| regmap_write(rpc->regmap, RPCIF_DRENR, |
| smenr & ~RPCIF_SMENR_SPIDE(0xF)); |
| regmap_write(rpc->regmap, RPCIF_DRDMCR, rpc->dummy); |
| regmap_write(rpc->regmap, RPCIF_DRDRENR, rpc->ddr); |
| memcpy_fromio(rpc->buffer, rpc->dirmap, rpc->xferlen); |
| regmap_write(rpc->regmap, RPCIF_DRCR, RPCIF_DRCR_RCF); |
| /* Dummy read according to spec */ |
| regmap_read(rpc->regmap, RPCIF_DRCR, &dummy); |
| break; |
| } |
| while (pos < rpc->xferlen) { |
| u32 bytes_left = rpc->xferlen - pos; |
| u32 nbytes, data[2], *p = data; |
| |
| /* nbytes may only be 1, 2, 4, or 8 */ |
| nbytes = bytes_left >= max ? max : (1 << ilog2(bytes_left)); |
| |
| regmap_write(rpc->regmap, RPCIF_SMADR, |
| rpc->smadr + pos); |
| smenr &= ~RPCIF_SMENR_SPIDE(0xF); |
| smenr |= RPCIF_SMENR_SPIDE(rpcif_bits_set(rpc, nbytes)); |
| regmap_write(rpc->regmap, RPCIF_SMENR, smenr); |
| regmap_write(rpc->regmap, RPCIF_SMCR, |
| rpc->smcr | RPCIF_SMCR_SPIE); |
| rpc->xfer_size = nbytes; |
| ret = wait_msg_xfer_end(rpc); |
| if (ret) |
| goto err_out; |
| |
| if (nbytes == 8) |
| regmap_read(rpc->regmap, RPCIF_SMRDR1, p++); |
| regmap_read(rpc->regmap, RPCIF_SMRDR0, p); |
| memcpy(rpc->buffer + pos, data, nbytes); |
| |
| pos += nbytes; |
| } |
| break; |
| default: |
| regmap_write(rpc->regmap, RPCIF_SMENR, rpc->enable); |
| regmap_write(rpc->regmap, RPCIF_SMCR, |
| rpc->smcr | RPCIF_SMCR_SPIE); |
| ret = wait_msg_xfer_end(rpc); |
| if (ret) |
| goto err_out; |
| } |
| |
| exit: |
| pm_runtime_put(dev); |
| return ret; |
| |
| err_out: |
| if (reset_control_reset(rpc->rstc)) |
| dev_err(dev, "Failed to reset HW\n"); |
| rpcif_hw_init(dev, rpc->bus_size == 2); |
| goto exit; |
| } |
| EXPORT_SYMBOL(rpcif_manual_xfer); |
| |
| static void memcpy_fromio_readw(void *to, |
| const void __iomem *from, |
| size_t count) |
| { |
| const int maxw = (IS_ENABLED(CONFIG_64BIT)) ? 8 : 4; |
| u8 buf[2]; |
| |
| if (count && ((unsigned long)from & 1)) { |
| *(u16 *)buf = __raw_readw((void __iomem *)((unsigned long)from & ~1)); |
| *(u8 *)to = buf[1]; |
| from++; |
| to++; |
| count--; |
| } |
| while (count >= 2 && !IS_ALIGNED((unsigned long)from, maxw)) { |
| *(u16 *)to = __raw_readw(from); |
| from += 2; |
| to += 2; |
| count -= 2; |
| } |
| while (count >= maxw) { |
| #ifdef CONFIG_64BIT |
| *(u64 *)to = __raw_readq(from); |
| #else |
| *(u32 *)to = __raw_readl(from); |
| #endif |
| from += maxw; |
| to += maxw; |
| count -= maxw; |
| } |
| while (count >= 2) { |
| *(u16 *)to = __raw_readw(from); |
| from += 2; |
| to += 2; |
| count -= 2; |
| } |
| if (count) { |
| *(u16 *)buf = __raw_readw(from); |
| *(u8 *)to = buf[0]; |
| } |
| } |
| |
| ssize_t rpcif_dirmap_read(struct device *dev, u64 offs, size_t len, void *buf) |
| { |
| struct rpcif_priv *rpc = dev_get_drvdata(dev); |
| loff_t from = offs & (rpc->size - 1); |
| size_t size = rpc->size - from; |
| int ret; |
| |
| if (len > size) |
| len = size; |
| |
| ret = pm_runtime_resume_and_get(dev); |
| if (ret < 0) |
| return ret; |
| |
| regmap_update_bits(rpc->regmap, RPCIF_CMNCR, RPCIF_CMNCR_MD, 0); |
| regmap_write(rpc->regmap, RPCIF_DRCR, 0); |
| regmap_write(rpc->regmap, RPCIF_DRCMR, rpc->command); |
| regmap_write(rpc->regmap, RPCIF_DREAR, |
| RPCIF_DREAR_EAV(offs >> 25) | RPCIF_DREAR_EAC(1)); |
| regmap_write(rpc->regmap, RPCIF_DROPR, rpc->option); |
| regmap_write(rpc->regmap, RPCIF_DRENR, |
| rpc->enable & ~RPCIF_SMENR_SPIDE(0xF)); |
| regmap_write(rpc->regmap, RPCIF_DRDMCR, rpc->dummy); |
| regmap_write(rpc->regmap, RPCIF_DRDRENR, rpc->ddr); |
| |
| if (rpc->bus_size == 2) |
| memcpy_fromio_readw(buf, rpc->dirmap + from, len); |
| else |
| memcpy_fromio(buf, rpc->dirmap + from, len); |
| |
| pm_runtime_put(dev); |
| |
| return len; |
| } |
| EXPORT_SYMBOL(rpcif_dirmap_read); |
| |
| static int rpcif_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct platform_device *vdev; |
| struct device_node *flash; |
| struct rpcif_priv *rpc; |
| struct resource *res; |
| const char *name; |
| int ret; |
| |
| flash = of_get_next_child(dev->of_node, NULL); |
| if (!flash) { |
| dev_warn(dev, "no flash node found\n"); |
| return -ENODEV; |
| } |
| |
| if (of_device_is_compatible(flash, "jedec,spi-nor")) { |
| name = "rpc-if-spi"; |
| } else if (of_device_is_compatible(flash, "cfi-flash")) { |
| name = "rpc-if-hyperflash"; |
| } else { |
| of_node_put(flash); |
| dev_warn(dev, "unknown flash type\n"); |
| return -ENODEV; |
| } |
| of_node_put(flash); |
| |
| rpc = devm_kzalloc(dev, sizeof(*rpc), GFP_KERNEL); |
| if (!rpc) |
| return -ENOMEM; |
| |
| rpc->base = devm_platform_ioremap_resource_byname(pdev, "regs"); |
| if (IS_ERR(rpc->base)) |
| return PTR_ERR(rpc->base); |
| |
| rpc->regmap = devm_regmap_init(dev, NULL, rpc, &rpcif_regmap_config); |
| if (IS_ERR(rpc->regmap)) { |
| dev_err(dev, "failed to init regmap for rpcif, error %ld\n", |
| PTR_ERR(rpc->regmap)); |
| return PTR_ERR(rpc->regmap); |
| } |
| |
| res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dirmap"); |
| rpc->dirmap = devm_ioremap_resource(dev, res); |
| if (IS_ERR(rpc->dirmap)) |
| return PTR_ERR(rpc->dirmap); |
| rpc->size = resource_size(res); |
| |
| rpc->type = (uintptr_t)of_device_get_match_data(dev); |
| rpc->rstc = devm_reset_control_get_exclusive(dev, NULL); |
| if (IS_ERR(rpc->rstc)) |
| return PTR_ERR(rpc->rstc); |
| |
| vdev = platform_device_alloc(name, pdev->id); |
| if (!vdev) |
| return -ENOMEM; |
| vdev->dev.parent = dev; |
| |
| rpc->dev = dev; |
| rpc->vdev = vdev; |
| platform_set_drvdata(pdev, rpc); |
| |
| ret = platform_device_add(vdev); |
| if (ret) { |
| platform_device_put(vdev); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int rpcif_remove(struct platform_device *pdev) |
| { |
| struct rpcif_priv *rpc = platform_get_drvdata(pdev); |
| |
| platform_device_unregister(rpc->vdev); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id rpcif_of_match[] = { |
| { .compatible = "renesas,rcar-gen3-rpc-if", .data = (void *)RPCIF_RCAR_GEN3 }, |
| { .compatible = "renesas,rcar-gen4-rpc-if", .data = (void *)RPCIF_RCAR_GEN4 }, |
| { .compatible = "renesas,rzg2l-rpc-if", .data = (void *)RPCIF_RZ_G2L }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, rpcif_of_match); |
| |
| static struct platform_driver rpcif_driver = { |
| .probe = rpcif_probe, |
| .remove = rpcif_remove, |
| .driver = { |
| .name = "rpc-if", |
| .of_match_table = rpcif_of_match, |
| }, |
| }; |
| module_platform_driver(rpcif_driver); |
| |
| MODULE_DESCRIPTION("Renesas RPC-IF core driver"); |
| MODULE_LICENSE("GPL v2"); |