| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Bayi Cheng | 2000 | 80.48% | 2 | 25.00% |
| Guochun Mao | 412 | 16.58% | 3 | 37.50% |
| Brian Norris | 27 | 1.09% | 1 | 12.50% |
| Michal Suchanek | 24 | 0.97% | 1 | 12.50% |
| Cyrille Pitchen | 22 | 0.89% | 1 | 12.50% |
| Total | 2485 | 8 |
/* * Copyright (c) 2015 MediaTek Inc. * Author: Bayi Cheng <bayi.cheng@mediatek.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that 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. */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/init.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/ioport.h> #include <linux/math64.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/mtd/mtd.h> #include <linux/mtd/partitions.h> #include <linux/mtd/spi-nor.h> #define MTK_NOR_CMD_REG 0x00 #define MTK_NOR_CNT_REG 0x04 #define MTK_NOR_RDSR_REG 0x08 #define MTK_NOR_RDATA_REG 0x0c #define MTK_NOR_RADR0_REG 0x10 #define MTK_NOR_RADR1_REG 0x14 #define MTK_NOR_RADR2_REG 0x18 #define MTK_NOR_WDATA_REG 0x1c #define MTK_NOR_PRGDATA0_REG 0x20 #define MTK_NOR_PRGDATA1_REG 0x24 #define MTK_NOR_PRGDATA2_REG 0x28 #define MTK_NOR_PRGDATA3_REG 0x2c #define MTK_NOR_PRGDATA4_REG 0x30 #define MTK_NOR_PRGDATA5_REG 0x34 #define MTK_NOR_SHREG0_REG 0x38 #define MTK_NOR_SHREG1_REG 0x3c #define MTK_NOR_SHREG2_REG 0x40 #define MTK_NOR_SHREG3_REG 0x44 #define MTK_NOR_SHREG4_REG 0x48 #define MTK_NOR_SHREG5_REG 0x4c #define MTK_NOR_SHREG6_REG 0x50 #define MTK_NOR_SHREG7_REG 0x54 #define MTK_NOR_SHREG8_REG 0x58 #define MTK_NOR_SHREG9_REG 0x5c #define MTK_NOR_CFG1_REG 0x60 #define MTK_NOR_CFG2_REG 0x64 #define MTK_NOR_CFG3_REG 0x68 #define MTK_NOR_STATUS0_REG 0x70 #define MTK_NOR_STATUS1_REG 0x74 #define MTK_NOR_STATUS2_REG 0x78 #define MTK_NOR_STATUS3_REG 0x7c #define MTK_NOR_FLHCFG_REG 0x84 #define MTK_NOR_TIME_REG 0x94 #define MTK_NOR_PP_DATA_REG 0x98 #define MTK_NOR_PREBUF_STUS_REG 0x9c #define MTK_NOR_DELSEL0_REG 0xa0 #define MTK_NOR_DELSEL1_REG 0xa4 #define MTK_NOR_INTRSTUS_REG 0xa8 #define MTK_NOR_INTREN_REG 0xac #define MTK_NOR_CHKSUM_CTL_REG 0xb8 #define MTK_NOR_CHKSUM_REG 0xbc #define MTK_NOR_CMD2_REG 0xc0 #define MTK_NOR_WRPROT_REG 0xc4 #define MTK_NOR_RADR3_REG 0xc8 #define MTK_NOR_DUAL_REG 0xcc #define MTK_NOR_DELSEL2_REG 0xd0 #define MTK_NOR_DELSEL3_REG 0xd4 #define MTK_NOR_DELSEL4_REG 0xd8 /* commands for mtk nor controller */ #define MTK_NOR_READ_CMD 0x0 #define MTK_NOR_RDSR_CMD 0x2 #define MTK_NOR_PRG_CMD 0x4 #define MTK_NOR_WR_CMD 0x10 #define MTK_NOR_PIO_WR_CMD 0x90 #define MTK_NOR_WRSR_CMD 0x20 #define MTK_NOR_PIO_READ_CMD 0x81 #define MTK_NOR_WR_BUF_ENABLE 0x1 #define MTK_NOR_WR_BUF_DISABLE 0x0 #define MTK_NOR_ENABLE_SF_CMD 0x30 #define MTK_NOR_DUAD_ADDR_EN 0x8 #define MTK_NOR_QUAD_READ_EN 0x4 #define MTK_NOR_DUAL_ADDR_EN 0x2 #define MTK_NOR_DUAL_READ_EN 0x1 #define MTK_NOR_DUAL_DISABLE 0x0 #define MTK_NOR_FAST_READ 0x1 #define SFLASH_WRBUF_SIZE 128 /* Can shift up to 48 bits (6 bytes) of TX/RX */ #define MTK_NOR_MAX_RX_TX_SHIFT 6 /* can shift up to 56 bits (7 bytes) transfer by MTK_NOR_PRG_CMD */ #define MTK_NOR_MAX_SHIFT 7 /* nor controller 4-byte address mode enable bit */ #define MTK_NOR_4B_ADDR_EN BIT(4) /* Helpers for accessing the program data / shift data registers */ #define MTK_NOR_PRG_REG(n) (MTK_NOR_PRGDATA0_REG + 4 * (n)) #define MTK_NOR_SHREG(n) (MTK_NOR_SHREG0_REG + 4 * (n)) struct mtk_nor { struct spi_nor nor; struct device *dev; void __iomem *base; /* nor flash base address */ struct clk *spi_clk; struct clk *nor_clk; }; static void mtk_nor_set_read_mode(struct mtk_nor *mtk_nor) { struct spi_nor *nor = &mtk_nor->nor; switch (nor->read_proto) { case SNOR_PROTO_1_1_1: writeb(nor->read_opcode, mtk_nor->base + MTK_NOR_PRGDATA3_REG); writeb(MTK_NOR_FAST_READ, mtk_nor->base + MTK_NOR_CFG1_REG); break; case SNOR_PROTO_1_1_2: writeb(nor->read_opcode, mtk_nor->base + MTK_NOR_PRGDATA3_REG); writeb(MTK_NOR_DUAL_READ_EN, mtk_nor->base + MTK_NOR_DUAL_REG); break; case SNOR_PROTO_1_1_4: writeb(nor->read_opcode, mtk_nor->base + MTK_NOR_PRGDATA4_REG); writeb(MTK_NOR_QUAD_READ_EN, mtk_nor->base + MTK_NOR_DUAL_REG); break; default: writeb(MTK_NOR_DUAL_DISABLE, mtk_nor->base + MTK_NOR_DUAL_REG); break; } } static int mtk_nor_execute_cmd(struct mtk_nor *mtk_nor, u8 cmdval) { int reg; u8 val = cmdval & 0x1f; writeb(cmdval, mtk_nor->base + MTK_NOR_CMD_REG); return readl_poll_timeout(mtk_nor->base + MTK_NOR_CMD_REG, reg, !(reg & val), 100, 10000); } static int mtk_nor_do_tx_rx(struct mtk_nor *mtk_nor, u8 op, u8 *tx, int txlen, u8 *rx, int rxlen) { int len = 1 + txlen + rxlen; int i, ret, idx; if (len > MTK_NOR_MAX_SHIFT) return -EINVAL; writeb(len * 8, mtk_nor->base + MTK_NOR_CNT_REG); /* start at PRGDATA5, go down to PRGDATA0 */ idx = MTK_NOR_MAX_RX_TX_SHIFT - 1; /* opcode */ writeb(op, mtk_nor->base + MTK_NOR_PRG_REG(idx)); idx--; /* program TX data */ for (i = 0; i < txlen; i++, idx--) writeb(tx[i], mtk_nor->base + MTK_NOR_PRG_REG(idx)); /* clear out rest of TX registers */ while (idx >= 0) { writeb(0, mtk_nor->base + MTK_NOR_PRG_REG(idx)); idx--; } ret = mtk_nor_execute_cmd(mtk_nor, MTK_NOR_PRG_CMD); if (ret) return ret; /* restart at first RX byte */ idx = rxlen - 1; /* read out RX data */ for (i = 0; i < rxlen; i++, idx--) rx[i] = readb(mtk_nor->base + MTK_NOR_SHREG(idx)); return 0; } /* Do a WRSR (Write Status Register) command */ static int mtk_nor_wr_sr(struct mtk_nor *mtk_nor, u8 sr) { writeb(sr, mtk_nor->base + MTK_NOR_PRGDATA5_REG); writeb(8, mtk_nor->base + MTK_NOR_CNT_REG); return mtk_nor_execute_cmd(mtk_nor, MTK_NOR_WRSR_CMD); } static int mtk_nor_write_buffer_enable(struct mtk_nor *mtk_nor) { u8 reg; /* the bit0 of MTK_NOR_CFG2_REG is pre-fetch buffer * 0: pre-fetch buffer use for read * 1: pre-fetch buffer use for page program */ writel(MTK_NOR_WR_BUF_ENABLE, mtk_nor->base + MTK_NOR_CFG2_REG); return readb_poll_timeout(mtk_nor->base + MTK_NOR_CFG2_REG, reg, 0x01 == (reg & 0x01), 100, 10000); } static int mtk_nor_write_buffer_disable(struct mtk_nor *mtk_nor) { u8 reg; writel(MTK_NOR_WR_BUF_DISABLE, mtk_nor->base + MTK_NOR_CFG2_REG); return readb_poll_timeout(mtk_nor->base + MTK_NOR_CFG2_REG, reg, MTK_NOR_WR_BUF_DISABLE == (reg & 0x1), 100, 10000); } static void mtk_nor_set_addr_width(struct mtk_nor *mtk_nor) { u8 val; struct spi_nor *nor = &mtk_nor->nor; val = readb(mtk_nor->base + MTK_NOR_DUAL_REG); switch (nor->addr_width) { case 3: val &= ~MTK_NOR_4B_ADDR_EN; break; case 4: val |= MTK_NOR_4B_ADDR_EN; break; default: dev_warn(mtk_nor->dev, "Unexpected address width %u.\n", nor->addr_width); break; } writeb(val, mtk_nor->base + MTK_NOR_DUAL_REG); } static void mtk_nor_set_addr(struct mtk_nor *mtk_nor, u32 addr) { int i; mtk_nor_set_addr_width(mtk_nor); for (i = 0; i < 3; i++) { writeb(addr & 0xff, mtk_nor->base + MTK_NOR_RADR0_REG + i * 4); addr >>= 8; } /* Last register is non-contiguous */ writeb(addr & 0xff, mtk_nor->base + MTK_NOR_RADR3_REG); } static ssize_t mtk_nor_read(struct spi_nor *nor, loff_t from, size_t length, u_char *buffer) { int i, ret; int addr = (int)from; u8 *buf = (u8 *)buffer; struct mtk_nor *mtk_nor = nor->priv; /* set mode for fast read mode ,dual mode or quad mode */ mtk_nor_set_read_mode(mtk_nor); mtk_nor_set_addr(mtk_nor, addr); for (i = 0; i < length; i++) { ret = mtk_nor_execute_cmd(mtk_nor, MTK_NOR_PIO_READ_CMD); if (ret < 0) return ret; buf[i] = readb(mtk_nor->base + MTK_NOR_RDATA_REG); } return length; } static int mtk_nor_write_single_byte(struct mtk_nor *mtk_nor, int addr, int length, u8 *data) { int i, ret; mtk_nor_set_addr(mtk_nor, addr); for (i = 0; i < length; i++) { writeb(*data++, mtk_nor->base + MTK_NOR_WDATA_REG); ret = mtk_nor_execute_cmd(mtk_nor, MTK_NOR_PIO_WR_CMD); if (ret < 0) return ret; } return 0; } static int mtk_nor_write_buffer(struct mtk_nor *mtk_nor, int addr, const u8 *buf) { int i, bufidx, data; mtk_nor_set_addr(mtk_nor, addr); bufidx = 0; for (i = 0; i < SFLASH_WRBUF_SIZE; i += 4) { data = buf[bufidx + 3]<<24 | buf[bufidx + 2]<<16 | buf[bufidx + 1]<<8 | buf[bufidx]; bufidx += 4; writel(data, mtk_nor->base + MTK_NOR_PP_DATA_REG); } return mtk_nor_execute_cmd(mtk_nor, MTK_NOR_WR_CMD); } static ssize_t mtk_nor_write(struct spi_nor *nor, loff_t to, size_t len, const u_char *buf) { int ret; struct mtk_nor *mtk_nor = nor->priv; size_t i; ret = mtk_nor_write_buffer_enable(mtk_nor); if (ret < 0) { dev_warn(mtk_nor->dev, "write buffer enable failed!\n"); return ret; } for (i = 0; i + SFLASH_WRBUF_SIZE <= len; i += SFLASH_WRBUF_SIZE) { ret = mtk_nor_write_buffer(mtk_nor, to, buf); if (ret < 0) { dev_err(mtk_nor->dev, "write buffer failed!\n"); return ret; } to += SFLASH_WRBUF_SIZE; buf += SFLASH_WRBUF_SIZE; } ret = mtk_nor_write_buffer_disable(mtk_nor); if (ret < 0) { dev_warn(mtk_nor->dev, "write buffer disable failed!\n"); return ret; } if (i < len) { ret = mtk_nor_write_single_byte(mtk_nor, to, (int)(len - i), (u8 *)buf); if (ret < 0) { dev_err(mtk_nor->dev, "write single byte failed!\n"); return ret; } } return len; } static int mtk_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len) { int ret; struct mtk_nor *mtk_nor = nor->priv; switch (opcode) { case SPINOR_OP_RDSR: ret = mtk_nor_execute_cmd(mtk_nor, MTK_NOR_RDSR_CMD); if (ret < 0) return ret; if (len == 1) *buf = readb(mtk_nor->base + MTK_NOR_RDSR_REG); else dev_err(mtk_nor->dev, "len should be 1 for read status!\n"); break; default: ret = mtk_nor_do_tx_rx(mtk_nor, opcode, NULL, 0, buf, len); break; } return ret; } static int mtk_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len) { int ret; struct mtk_nor *mtk_nor = nor->priv; switch (opcode) { case SPINOR_OP_WRSR: /* We only handle 1 byte */ ret = mtk_nor_wr_sr(mtk_nor, *buf); break; default: ret = mtk_nor_do_tx_rx(mtk_nor, opcode, buf, len, NULL, 0); if (ret) dev_warn(mtk_nor->dev, "write reg failure!\n"); break; } return ret; } static void mtk_nor_disable_clk(struct mtk_nor *mtk_nor) { clk_disable_unprepare(mtk_nor->spi_clk); clk_disable_unprepare(mtk_nor->nor_clk); } static int mtk_nor_enable_clk(struct mtk_nor *mtk_nor) { int ret; ret = clk_prepare_enable(mtk_nor->spi_clk); if (ret) return ret; ret = clk_prepare_enable(mtk_nor->nor_clk); if (ret) { clk_disable_unprepare(mtk_nor->spi_clk); return ret; } return 0; } static int mtk_nor_init(struct mtk_nor *mtk_nor, struct device_node *flash_node) { const struct spi_nor_hwcaps hwcaps = { .mask = SNOR_HWCAPS_READ_FAST | SNOR_HWCAPS_READ_1_1_2 | SNOR_HWCAPS_PP, }; int ret; struct spi_nor *nor; /* initialize controller to accept commands */ writel(MTK_NOR_ENABLE_SF_CMD, mtk_nor->base + MTK_NOR_WRPROT_REG); nor = &mtk_nor->nor; nor->dev = mtk_nor->dev; nor->priv = mtk_nor; spi_nor_set_flash_node(nor, flash_node); /* fill the hooks to spi nor */ nor->read = mtk_nor_read; nor->read_reg = mtk_nor_read_reg; nor->write = mtk_nor_write; nor->write_reg = mtk_nor_write_reg; nor->mtd.name = "mtk_nor"; /* initialized with NULL */ ret = spi_nor_scan(nor, NULL, &hwcaps); if (ret) return ret; return mtd_device_register(&nor->mtd, NULL, 0); } static int mtk_nor_drv_probe(struct platform_device *pdev) { struct device_node *flash_np; struct resource *res; int ret; struct mtk_nor *mtk_nor; if (!pdev->dev.of_node) { dev_err(&pdev->dev, "No DT found\n"); return -EINVAL; } mtk_nor = devm_kzalloc(&pdev->dev, sizeof(*mtk_nor), GFP_KERNEL); if (!mtk_nor) return -ENOMEM; platform_set_drvdata(pdev, mtk_nor); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); mtk_nor->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(mtk_nor->base)) return PTR_ERR(mtk_nor->base); mtk_nor->spi_clk = devm_clk_get(&pdev->dev, "spi"); if (IS_ERR(mtk_nor->spi_clk)) return PTR_ERR(mtk_nor->spi_clk); mtk_nor->nor_clk = devm_clk_get(&pdev->dev, "sf"); if (IS_ERR(mtk_nor->nor_clk)) return PTR_ERR(mtk_nor->nor_clk); mtk_nor->dev = &pdev->dev; ret = mtk_nor_enable_clk(mtk_nor); if (ret) return ret; /* only support one attached flash */ flash_np = of_get_next_available_child(pdev->dev.of_node, NULL); if (!flash_np) { dev_err(&pdev->dev, "no SPI flash device to configure\n"); ret = -ENODEV; goto nor_free; } ret = mtk_nor_init(mtk_nor, flash_np); nor_free: if (ret) mtk_nor_disable_clk(mtk_nor); return ret; } static int mtk_nor_drv_remove(struct platform_device *pdev) { struct mtk_nor *mtk_nor = platform_get_drvdata(pdev); mtk_nor_disable_clk(mtk_nor); return 0; } #ifdef CONFIG_PM_SLEEP static int mtk_nor_suspend(struct device *dev) { struct mtk_nor *mtk_nor = dev_get_drvdata(dev); mtk_nor_disable_clk(mtk_nor); return 0; } static int mtk_nor_resume(struct device *dev) { struct mtk_nor *mtk_nor = dev_get_drvdata(dev); return mtk_nor_enable_clk(mtk_nor); } static const struct dev_pm_ops mtk_nor_dev_pm_ops = { .suspend = mtk_nor_suspend, .resume = mtk_nor_resume, }; #define MTK_NOR_DEV_PM_OPS (&mtk_nor_dev_pm_ops) #else #define MTK_NOR_DEV_PM_OPS NULL #endif static const struct of_device_id mtk_nor_of_ids[] = { { .compatible = "mediatek,mt8173-nor"}, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, mtk_nor_of_ids); static struct platform_driver mtk_nor_driver = { .probe = mtk_nor_drv_probe, .remove = mtk_nor_drv_remove, .driver = { .name = "mtk-nor", .pm = MTK_NOR_DEV_PM_OPS, .of_match_table = mtk_nor_of_ids, }, }; module_platform_driver(mtk_nor_driver); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("MediaTek SPI NOR Flash Driver");
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