473 lines
12 KiB
C
473 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Renesas RCar Gen3 RPC QSPI driver
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*
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* Copyright (C) 2018 Marek Vasut <marek.vasut@gmail.com>
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*/
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#include <common.h>
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#include <asm/global_data.h>
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#include <asm/io.h>
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#include <clk.h>
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#include <dm.h>
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#include <dm/of_access.h>
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#include <dt-structs.h>
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#include <errno.h>
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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <linux/errno.h>
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#include <spi.h>
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#include <wait_bit.h>
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#define RPC_CMNCR 0x0000 /* R/W */
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#define RPC_CMNCR_MD BIT(31)
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#define RPC_CMNCR_SFDE BIT(24)
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#define RPC_CMNCR_MOIIO3(val) (((val) & 0x3) << 22)
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#define RPC_CMNCR_MOIIO2(val) (((val) & 0x3) << 20)
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#define RPC_CMNCR_MOIIO1(val) (((val) & 0x3) << 18)
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#define RPC_CMNCR_MOIIO0(val) (((val) & 0x3) << 16)
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#define RPC_CMNCR_MOIIO_HIZ (RPC_CMNCR_MOIIO0(3) | RPC_CMNCR_MOIIO1(3) | \
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RPC_CMNCR_MOIIO2(3) | RPC_CMNCR_MOIIO3(3))
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#define RPC_CMNCR_IO3FV(val) (((val) & 0x3) << 14)
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#define RPC_CMNCR_IO2FV(val) (((val) & 0x3) << 12)
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#define RPC_CMNCR_IO0FV(val) (((val) & 0x3) << 8)
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#define RPC_CMNCR_IOFV_HIZ (RPC_CMNCR_IO0FV(3) | RPC_CMNCR_IO2FV(3) | \
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RPC_CMNCR_IO3FV(3))
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#define RPC_CMNCR_CPHAT BIT(6)
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#define RPC_CMNCR_CPHAR BIT(5)
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#define RPC_CMNCR_SSLP BIT(4)
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#define RPC_CMNCR_CPOL BIT(3)
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#define RPC_CMNCR_BSZ(val) (((val) & 0x3) << 0)
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#define RPC_SSLDR 0x0004 /* R/W */
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#define RPC_SSLDR_SPNDL(d) (((d) & 0x7) << 16)
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#define RPC_SSLDR_SLNDL(d) (((d) & 0x7) << 8)
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#define RPC_SSLDR_SCKDL(d) (((d) & 0x7) << 0)
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#define RPC_DRCR 0x000C /* R/W */
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#define RPC_DRCR_SSLN BIT(24)
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#define RPC_DRCR_RBURST(v) (((v) & 0x1F) << 16)
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#define RPC_DRCR_RCF BIT(9)
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#define RPC_DRCR_RBE BIT(8)
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#define RPC_DRCR_SSLE BIT(0)
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#define RPC_DRCMR 0x0010 /* R/W */
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#define RPC_DRCMR_CMD(c) (((c) & 0xFF) << 16)
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#define RPC_DRCMR_OCMD(c) (((c) & 0xFF) << 0)
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#define RPC_DREAR 0x0014 /* R/W */
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#define RPC_DREAR_EAV(v) (((v) & 0xFF) << 16)
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#define RPC_DREAR_EAC(v) (((v) & 0x7) << 0)
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#define RPC_DROPR 0x0018 /* R/W */
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#define RPC_DROPR_OPD3(o) (((o) & 0xFF) << 24)
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#define RPC_DROPR_OPD2(o) (((o) & 0xFF) << 16)
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#define RPC_DROPR_OPD1(o) (((o) & 0xFF) << 8)
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#define RPC_DROPR_OPD0(o) (((o) & 0xFF) << 0)
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#define RPC_DRENR 0x001C /* R/W */
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#define RPC_DRENR_CDB(o) (u32)((((o) & 0x3) << 30))
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#define RPC_DRENR_OCDB(o) (((o) & 0x3) << 28)
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#define RPC_DRENR_ADB(o) (((o) & 0x3) << 24)
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#define RPC_DRENR_OPDB(o) (((o) & 0x3) << 20)
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#define RPC_DRENR_SPIDB(o) (((o) & 0x3) << 16)
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#define RPC_DRENR_DME BIT(15)
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#define RPC_DRENR_CDE BIT(14)
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#define RPC_DRENR_OCDE BIT(12)
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#define RPC_DRENR_ADE(v) (((v) & 0xF) << 8)
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#define RPC_DRENR_OPDE(v) (((v) & 0xF) << 4)
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#define RPC_SMCR 0x0020 /* R/W */
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#define RPC_SMCR_SSLKP BIT(8)
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#define RPC_SMCR_SPIRE BIT(2)
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#define RPC_SMCR_SPIWE BIT(1)
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#define RPC_SMCR_SPIE BIT(0)
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#define RPC_SMCMR 0x0024 /* R/W */
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#define RPC_SMCMR_CMD(c) (((c) & 0xFF) << 16)
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#define RPC_SMCMR_OCMD(c) (((c) & 0xFF) << 0)
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#define RPC_SMADR 0x0028 /* R/W */
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#define RPC_SMOPR 0x002C /* R/W */
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#define RPC_SMOPR_OPD0(o) (((o) & 0xFF) << 0)
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#define RPC_SMOPR_OPD1(o) (((o) & 0xFF) << 8)
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#define RPC_SMOPR_OPD2(o) (((o) & 0xFF) << 16)
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#define RPC_SMOPR_OPD3(o) (((o) & 0xFF) << 24)
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#define RPC_SMENR 0x0030 /* R/W */
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#define RPC_SMENR_CDB(o) (((o) & 0x3) << 30)
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#define RPC_SMENR_OCDB(o) (((o) & 0x3) << 28)
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#define RPC_SMENR_ADB(o) (((o) & 0x3) << 24)
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#define RPC_SMENR_OPDB(o) (((o) & 0x3) << 20)
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#define RPC_SMENR_SPIDB(o) (((o) & 0x3) << 16)
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#define RPC_SMENR_DME BIT(15)
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#define RPC_SMENR_CDE BIT(14)
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#define RPC_SMENR_OCDE BIT(12)
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#define RPC_SMENR_ADE(v) (((v) & 0xF) << 8)
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#define RPC_SMENR_OPDE(v) (((v) & 0xF) << 4)
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#define RPC_SMENR_SPIDE(v) (((v) & 0xF) << 0)
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#define RPC_SMRDR0 0x0038 /* R */
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#define RPC_SMRDR1 0x003C /* R */
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#define RPC_SMWDR0 0x0040 /* R/W */
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#define RPC_SMWDR1 0x0044 /* R/W */
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#define RPC_CMNSR 0x0048 /* R */
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#define RPC_CMNSR_SSLF BIT(1)
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#define RPC_CMNSR_TEND BIT(0)
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#define RPC_DRDMCR 0x0058 /* R/W */
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#define RPC_DRDMCR_DMCYC(v) (((v) & 0xF) << 0)
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#define RPC_DRDRENR 0x005C /* R/W */
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#define RPC_DRDRENR_HYPE (0x5 << 12)
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#define RPC_DRDRENR_ADDRE BIT(8)
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#define RPC_DRDRENR_OPDRE BIT(4)
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#define RPC_DRDRENR_DRDRE BIT(0)
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#define RPC_SMDMCR 0x0060 /* R/W */
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#define RPC_SMDMCR_DMCYC(v) (((v) & 0xF) << 0)
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#define RPC_SMDRENR 0x0064 /* R/W */
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#define RPC_SMDRENR_HYPE (0x5 << 12)
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#define RPC_SMDRENR_ADDRE BIT(8)
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#define RPC_SMDRENR_OPDRE BIT(4)
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#define RPC_SMDRENR_SPIDRE BIT(0)
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#define RPC_PHYCNT 0x007C /* R/W */
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#define RPC_PHYCNT_CAL BIT(31)
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#define PRC_PHYCNT_OCTA_AA BIT(22)
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#define PRC_PHYCNT_OCTA_SA BIT(23)
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#define PRC_PHYCNT_EXDS BIT(21)
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#define RPC_PHYCNT_OCT BIT(20)
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#define RPC_PHYCNT_STRTIM(v) (((v) & 0x7) << 15)
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#define RPC_PHYCNT_WBUF2 BIT(4)
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#define RPC_PHYCNT_WBUF BIT(2)
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#define RPC_PHYCNT_MEM(v) (((v) & 0x3) << 0)
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#define RPC_PHYINT 0x0088 /* R/W */
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#define RPC_PHYINT_RSTEN BIT(18)
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#define RPC_PHYINT_WPEN BIT(17)
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#define RPC_PHYINT_INTEN BIT(16)
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#define RPC_PHYINT_RST BIT(2)
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#define RPC_PHYINT_WP BIT(1)
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#define RPC_PHYINT_INT BIT(0)
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#define RPC_WBUF 0x8000 /* R/W size=4/8/16/32/64Bytes */
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#define RPC_WBUF_SIZE 0x100
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DECLARE_GLOBAL_DATA_PTR;
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struct rpc_spi_plat {
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fdt_addr_t regs;
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fdt_addr_t extr;
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s32 freq; /* Default clock freq, -1 for none */
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};
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struct rpc_spi_priv {
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fdt_addr_t regs;
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fdt_addr_t extr;
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struct clk clk;
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u8 cmdcopy[8];
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u32 cmdlen;
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bool cmdstarted;
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};
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static int rpc_spi_wait_sslf(struct udevice *dev)
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{
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struct rpc_spi_priv *priv = dev_get_priv(dev->parent);
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return wait_for_bit_le32((void *)priv->regs + RPC_CMNSR, RPC_CMNSR_SSLF,
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false, 1000, false);
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}
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static int rpc_spi_wait_tend(struct udevice *dev)
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{
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struct rpc_spi_priv *priv = dev_get_priv(dev->parent);
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return wait_for_bit_le32((void *)priv->regs + RPC_CMNSR, RPC_CMNSR_TEND,
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true, 1000, false);
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}
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static void rpc_spi_flush_read_cache(struct udevice *dev)
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{
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struct udevice *bus = dev->parent;
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struct rpc_spi_priv *priv = dev_get_priv(bus);
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/* Flush read cache */
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writel(RPC_DRCR_SSLN | RPC_DRCR_RBURST(0x1f) |
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RPC_DRCR_RCF | RPC_DRCR_RBE | RPC_DRCR_SSLE,
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priv->regs + RPC_DRCR);
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readl(priv->regs + RPC_DRCR);
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}
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static int rpc_spi_claim_bus(struct udevice *dev, bool manual)
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{
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struct udevice *bus = dev->parent;
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struct rpc_spi_priv *priv = dev_get_priv(bus);
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/*
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* NOTE: The 0x260 are undocumented bits, but they must be set.
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* NOTE: On H3 ES1.x (not supported in mainline U-Boot), the
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* RPC_PHYCNT_STRTIM shall be 0, while on newer parts, the
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* RPC_PHYCNT_STRTIM shall be 6.
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*/
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writel(RPC_PHYCNT_CAL | RPC_PHYCNT_STRTIM(6) | 0x260,
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priv->regs + RPC_PHYCNT);
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writel((manual ? RPC_CMNCR_MD : 0) | RPC_CMNCR_SFDE |
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RPC_CMNCR_MOIIO_HIZ | RPC_CMNCR_IOFV_HIZ | RPC_CMNCR_BSZ(0),
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priv->regs + RPC_CMNCR);
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writel(RPC_SSLDR_SPNDL(7) | RPC_SSLDR_SLNDL(7) |
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RPC_SSLDR_SCKDL(7), priv->regs + RPC_SSLDR);
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rpc_spi_flush_read_cache(dev);
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return 0;
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}
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static int rpc_spi_release_bus(struct udevice *dev)
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{
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struct udevice *bus = dev->parent;
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struct rpc_spi_priv *priv = dev_get_priv(bus);
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/* NOTE: The 0x260 are undocumented bits, but they must be set. */
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writel(RPC_PHYCNT_STRTIM(6) | 0x260, priv->regs + RPC_PHYCNT);
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rpc_spi_flush_read_cache(dev);
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return 0;
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}
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static int rpc_spi_xfer(struct udevice *dev, unsigned int bitlen,
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const void *dout, void *din, unsigned long flags)
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{
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struct udevice *bus = dev->parent;
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struct rpc_spi_priv *priv = dev_get_priv(bus);
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u32 wlen = dout ? (bitlen / 8) : 0;
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u32 rlen = din ? (bitlen / 8) : 0;
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u32 wloop = DIV_ROUND_UP(wlen, 4);
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u32 smenr, smcr, offset;
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int ret = 0;
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if (!priv->cmdstarted) {
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if (!wlen || rlen)
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BUG();
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memcpy(priv->cmdcopy, dout, wlen);
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priv->cmdlen = wlen;
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/* Command transfer start */
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priv->cmdstarted = true;
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if (!(flags & SPI_XFER_END))
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return 0;
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}
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offset = (priv->cmdcopy[1] << 16) | (priv->cmdcopy[2] << 8) |
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(priv->cmdcopy[3] << 0);
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smenr = 0;
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if (wlen || (!rlen && !wlen) || flags == SPI_XFER_ONCE) {
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if (wlen && flags == SPI_XFER_END)
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smenr = RPC_SMENR_SPIDE(0xf);
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rpc_spi_claim_bus(dev, true);
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writel(0, priv->regs + RPC_SMCR);
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if (priv->cmdlen >= 1) { /* Command(1) */
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writel(RPC_SMCMR_CMD(priv->cmdcopy[0]),
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priv->regs + RPC_SMCMR);
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smenr |= RPC_SMENR_CDE;
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} else {
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writel(0, priv->regs + RPC_SMCMR);
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}
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if (priv->cmdlen >= 4) { /* Address(3) */
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writel(offset, priv->regs + RPC_SMADR);
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smenr |= RPC_SMENR_ADE(7);
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} else {
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writel(0, priv->regs + RPC_SMADR);
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}
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if (priv->cmdlen >= 5) { /* Dummy(n) */
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writel(8 * (priv->cmdlen - 4) - 1,
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priv->regs + RPC_SMDMCR);
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smenr |= RPC_SMENR_DME;
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} else {
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writel(0, priv->regs + RPC_SMDMCR);
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}
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writel(0, priv->regs + RPC_SMOPR);
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writel(0, priv->regs + RPC_SMDRENR);
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if (wlen && flags == SPI_XFER_END) {
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u32 *datout = (u32 *)dout;
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while (wloop--) {
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smcr = RPC_SMCR_SPIWE | RPC_SMCR_SPIE;
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if (wloop >= 1)
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smcr |= RPC_SMCR_SSLKP;
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writel(smenr, priv->regs + RPC_SMENR);
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writel(*datout, priv->regs + RPC_SMWDR0);
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writel(smcr, priv->regs + RPC_SMCR);
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ret = rpc_spi_wait_tend(dev);
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if (ret)
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goto err;
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datout++;
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smenr = RPC_SMENR_SPIDE(0xf);
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}
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ret = rpc_spi_wait_sslf(dev);
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} else {
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writel(smenr, priv->regs + RPC_SMENR);
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writel(RPC_SMCR_SPIE, priv->regs + RPC_SMCR);
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ret = rpc_spi_wait_tend(dev);
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}
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} else { /* Read data only, using DRx ext access */
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rpc_spi_claim_bus(dev, false);
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if (priv->cmdlen >= 1) { /* Command(1) */
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writel(RPC_DRCMR_CMD(priv->cmdcopy[0]),
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priv->regs + RPC_DRCMR);
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smenr |= RPC_DRENR_CDE;
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} else {
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writel(0, priv->regs + RPC_DRCMR);
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}
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if (priv->cmdlen >= 4) /* Address(3) */
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smenr |= RPC_DRENR_ADE(7);
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if (priv->cmdlen >= 5) { /* Dummy(n) */
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writel(8 * (priv->cmdlen - 4) - 1,
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priv->regs + RPC_DRDMCR);
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smenr |= RPC_DRENR_DME;
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} else {
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writel(0, priv->regs + RPC_DRDMCR);
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}
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writel(0, priv->regs + RPC_DROPR);
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writel(smenr, priv->regs + RPC_DRENR);
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if (rlen)
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memcpy_fromio(din, (void *)(priv->extr + offset), rlen);
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else
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readl(priv->extr); /* Dummy read */
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}
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err:
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priv->cmdstarted = false;
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rpc_spi_release_bus(dev);
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return ret;
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}
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static int rpc_spi_set_speed(struct udevice *bus, uint speed)
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{
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/* This is a SPI NOR controller, do nothing. */
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return 0;
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}
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static int rpc_spi_set_mode(struct udevice *bus, uint mode)
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{
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/* This is a SPI NOR controller, do nothing. */
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return 0;
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}
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static int rpc_spi_bind(struct udevice *parent)
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{
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const void *fdt = gd->fdt_blob;
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ofnode node;
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int ret, off;
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/*
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* Check if there are any SPI NOR child nodes, if so, bind as
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* this controller will be operated in SPI mode.
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*/
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dev_for_each_subnode(node, parent) {
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off = ofnode_to_offset(node);
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ret = fdt_node_check_compatible(fdt, off, "spi-flash");
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if (!ret)
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return 0;
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ret = fdt_node_check_compatible(fdt, off, "jedec,spi-nor");
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if (!ret)
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return 0;
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}
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return -ENODEV;
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}
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static int rpc_spi_probe(struct udevice *dev)
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{
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struct rpc_spi_plat *plat = dev_get_plat(dev);
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struct rpc_spi_priv *priv = dev_get_priv(dev);
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priv->regs = plat->regs;
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priv->extr = plat->extr;
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#if CONFIG_IS_ENABLED(CLK)
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clk_enable(&priv->clk);
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#endif
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return 0;
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}
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static int rpc_spi_of_to_plat(struct udevice *bus)
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{
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struct rpc_spi_plat *plat = dev_get_plat(bus);
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plat->regs = dev_read_addr_index(bus, 0);
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plat->extr = dev_read_addr_index(bus, 1);
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#if CONFIG_IS_ENABLED(CLK)
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struct rpc_spi_priv *priv = dev_get_priv(bus);
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int ret;
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ret = clk_get_by_index(bus, 0, &priv->clk);
|
|
if (ret < 0) {
|
|
printf("%s: Could not get clock for %s: %d\n",
|
|
__func__, bus->name, ret);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
plat->freq = dev_read_u32_default(bus, "spi-max-freq", 50000000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dm_spi_ops rpc_spi_ops = {
|
|
.xfer = rpc_spi_xfer,
|
|
.set_speed = rpc_spi_set_speed,
|
|
.set_mode = rpc_spi_set_mode,
|
|
};
|
|
|
|
static const struct udevice_id rpc_spi_ids[] = {
|
|
{ .compatible = "renesas,rpc-r7s72100" },
|
|
{ .compatible = "renesas,rpc-r8a7795" },
|
|
{ .compatible = "renesas,rpc-r8a7796" },
|
|
{ .compatible = "renesas,rpc-r8a77965" },
|
|
{ .compatible = "renesas,rpc-r8a77970" },
|
|
{ .compatible = "renesas,rpc-r8a77995" },
|
|
{ .compatible = "renesas,rcar-gen3-rpc" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(rpc_spi) = {
|
|
.name = "rpc_spi",
|
|
.id = UCLASS_SPI,
|
|
.of_match = rpc_spi_ids,
|
|
.ops = &rpc_spi_ops,
|
|
.of_to_plat = rpc_spi_of_to_plat,
|
|
.plat_auto = sizeof(struct rpc_spi_plat),
|
|
.priv_auto = sizeof(struct rpc_spi_priv),
|
|
.bind = rpc_spi_bind,
|
|
.probe = rpc_spi_probe,
|
|
};
|