/* * GPMC support functions * * Copyright (C) 2005-2006 Nokia Corporation * * Author: Juha Yrjola * * Copyright (C) 2009 Texas Instruments * Added OMAP4 support - Santosh Shilimkar * * 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. */ #undef DEBUG #include #include #include #include #include #include #include #include #include #include #include /* GPMC register offsets */ #define GPMC_REVISION 0x00 #define GPMC_SYSCONFIG 0x10 #define GPMC_SYSSTATUS 0x14 #define GPMC_IRQSTATUS 0x18 #define GPMC_IRQENABLE 0x1c #define GPMC_TIMEOUT_CONTROL 0x40 #define GPMC_ERR_ADDRESS 0x44 #define GPMC_ERR_TYPE 0x48 #define GPMC_CONFIG 0x50 #define GPMC_STATUS 0x54 #define GPMC_PREFETCH_CONFIG1 0x1e0 #define GPMC_PREFETCH_CONFIG2 0x1e4 #define GPMC_PREFETCH_CONTROL 0x1ec #define GPMC_PREFETCH_STATUS 0x1f0 #define GPMC_ECC_CONFIG 0x1f4 #define GPMC_ECC_CONTROL 0x1f8 #define GPMC_ECC_SIZE_CONFIG 0x1fc #define GPMC_ECC1_RESULT 0x200 #define GPMC_CS0_OFFSET 0x60 #define GPMC_CS_SIZE 0x30 #define GPMC_MEM_START 0x00000000 #define GPMC_MEM_END 0x3FFFFFFF #define BOOT_ROM_SPACE 0x100000 /* 1MB */ #define GPMC_CHUNK_SHIFT 24 /* 16 MB */ #define GPMC_SECTION_SHIFT 28 /* 128 MB */ #define PREFETCH_FIFOTHRESHOLD (0x40 << 8) #define CS_NUM_SHIFT 24 #define ENABLE_PREFETCH (0x1 << 7) #define DMA_MPU_MODE 2 /* Structure to save gpmc cs context */ struct gpmc_cs_config { u32 config1; u32 config2; u32 config3; u32 config4; u32 config5; u32 config6; u32 config7; int is_valid; }; /* * Structure to save/restore gpmc context * to support core off on OMAP3 */ struct omap3_gpmc_regs { u32 sysconfig; u32 irqenable; u32 timeout_ctrl; u32 config; u32 prefetch_config1; u32 prefetch_config2; u32 prefetch_control; struct gpmc_cs_config cs_context[GPMC_CS_NUM]; }; static struct resource gpmc_mem_root; static struct resource gpmc_cs_mem[GPMC_CS_NUM]; static DEFINE_SPINLOCK(gpmc_mem_lock); static unsigned int gpmc_cs_map; /* flag for cs which are initialized */ static int gpmc_ecc_used = -EINVAL; /* cs using ecc engine */ static void __iomem *gpmc_base; static struct clk *gpmc_l3_clk; static void gpmc_write_reg(int idx, u32 val) { __raw_writel(val, gpmc_base + idx); } static u32 gpmc_read_reg(int idx) { return __raw_readl(gpmc_base + idx); } static void gpmc_cs_write_byte(int cs, int idx, u8 val) { void __iomem *reg_addr; reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx; __raw_writeb(val, reg_addr); } static u8 gpmc_cs_read_byte(int cs, int idx) { void __iomem *reg_addr; reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx; return __raw_readb(reg_addr); } void gpmc_cs_write_reg(int cs, int idx, u32 val) { void __iomem *reg_addr; reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx; __raw_writel(val, reg_addr); } u32 gpmc_cs_read_reg(int cs, int idx) { void __iomem *reg_addr; reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx; return __raw_readl(reg_addr); } /* TODO: Add support for gpmc_fck to clock framework and use it */ unsigned long gpmc_get_fclk_period(void) { unsigned long rate = clk_get_rate(gpmc_l3_clk); if (rate == 0) { printk(KERN_WARNING "gpmc_l3_clk not enabled\n"); return 0; } rate /= 1000; rate = 1000000000 / rate; /* In picoseconds */ return rate; } unsigned int gpmc_ns_to_ticks(unsigned int time_ns) { unsigned long tick_ps; /* Calculate in picosecs to yield more exact results */ tick_ps = gpmc_get_fclk_period(); return (time_ns * 1000 + tick_ps - 1) / tick_ps; } unsigned int gpmc_ticks_to_ns(unsigned int ticks) { return ticks * gpmc_get_fclk_period() / 1000; } unsigned int gpmc_round_ns_to_ticks(unsigned int time_ns) { unsigned long ticks = gpmc_ns_to_ticks(time_ns); return ticks * gpmc_get_fclk_period() / 1000; } #ifdef DEBUG static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, int time, const char *name) #else static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, int time) #endif { u32 l; int ticks, mask, nr_bits; if (time == 0) ticks = 0; else ticks = gpmc_ns_to_ticks(time); nr_bits = end_bit - st_bit + 1; if (ticks >= 1 << nr_bits) { #ifdef DEBUG printk(KERN_INFO "GPMC CS%d: %-10s* %3d ns, %3d ticks >= %d\n", cs, name, time, ticks, 1 << nr_bits); #endif return -1; } mask = (1 << nr_bits) - 1; l = gpmc_cs_read_reg(cs, reg); #ifdef DEBUG printk(KERN_INFO "GPMC CS%d: %-10s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n", cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000, (l >> st_bit) & mask, time); #endif l &= ~(mask << st_bit); l |= ticks << st_bit; gpmc_cs_write_reg(cs, reg, l); return 0; } #ifdef DEBUG #define GPMC_SET_ONE(reg, st, end, field) \ if (set_gpmc_timing_reg(cs, (reg), (st), (end), \ t->field, #field) < 0) \ return -1 #else #define GPMC_SET_ONE(reg, st, end, field) \ if (set_gpmc_timing_reg(cs, (reg), (st), (end), t->field) < 0) \ return -1 #endif int gpmc_cs_calc_divider(int cs, unsigned int sync_clk) { int div; u32 l; l = sync_clk * 1000 + (gpmc_get_fclk_period() - 1); div = l / gpmc_get_fclk_period(); if (div > 4) return -1; if (div <= 0) div = 1; return div; } int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t) { int div; u32 l; div = gpmc_cs_calc_divider(cs, t->sync_clk); if (div < 0) return -1; GPMC_SET_ONE(GPMC_CS_CONFIG2, 0, 3, cs_on); GPMC_SET_ONE(GPMC_CS_CONFIG2, 8, 12, cs_rd_off); GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off); GPMC_SET_ONE(GPMC_CS_CONFIG3, 0, 3, adv_on); GPMC_SET_ONE(GPMC_CS_CONFIG3, 8, 12, adv_rd_off); GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off); GPMC_SET_ONE(GPMC_CS_CONFIG4, 0, 3, oe_on); GPMC_SET_ONE(GPMC_CS_CONFIG4, 8, 12, oe_off); GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on); GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off); GPMC_SET_ONE(GPMC_CS_CONFIG5, 0, 4, rd_cycle); GPMC_SET_ONE(GPMC_CS_CONFIG5, 8, 12, wr_cycle); GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access); GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access); if (cpu_is_omap34xx()) { GPMC_SET_ONE(GPMC_CS_CONFIG6, 16, 19, wr_data_mux_bus); GPMC_SET_ONE(GPMC_CS_CONFIG6, 24, 28, wr_access); } /* caller is expected to have initialized CONFIG1 to cover * at least sync vs async */ l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1); if (l & (GPMC_CONFIG1_READTYPE_SYNC | GPMC_CONFIG1_WRITETYPE_SYNC)) { #ifdef DEBUG printk(KERN_INFO "GPMC CS%d CLK period is %lu ns (div %d)\n", cs, (div * gpmc_get_fclk_period()) / 1000, div); #endif l &= ~0x03; l |= (div - 1); gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l); } return 0; } static void gpmc_cs_enable_mem(int cs, u32 base, u32 size) { u32 l; u32 mask; mask = (1 << GPMC_SECTION_SHIFT) - size; l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); l &= ~0x3f; l = (base >> GPMC_CHUNK_SHIFT) & 0x3f; l &= ~(0x0f << 8); l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8; l |= GPMC_CONFIG7_CSVALID; gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l); } static void gpmc_cs_disable_mem(int cs) { u32 l; l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); l &= ~GPMC_CONFIG7_CSVALID; gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l); } static void gpmc_cs_get_memconf(int cs, u32 *base, u32 *size) { u32 l; u32 mask; l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); *base = (l & 0x3f) << GPMC_CHUNK_SHIFT; mask = (l >> 8) & 0x0f; *size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT); } static int gpmc_cs_mem_enabled(int cs) { u32 l; l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); return l & GPMC_CONFIG7_CSVALID; } int gpmc_cs_set_reserved(int cs, int reserved) { if (cs > GPMC_CS_NUM) return -ENODEV; gpmc_cs_map &= ~(1 << cs); gpmc_cs_map |= (reserved ? 1 : 0) << cs; return 0; } int gpmc_cs_reserved(int cs) { if (cs > GPMC_CS_NUM) return -ENODEV; return gpmc_cs_map & (1 << cs); } static unsigned long gpmc_mem_align(unsigned long size) { int order; size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1); order = GPMC_CHUNK_SHIFT - 1; do { size >>= 1; order++; } while (size); size = 1 << order; return size; } static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size) { struct resource *res = &gpmc_cs_mem[cs]; int r; size = gpmc_mem_align(size); spin_lock(&gpmc_mem_lock); res->start = base; res->end = base + size - 1; r = request_resource(&gpmc_mem_root, res); spin_unlock(&gpmc_mem_lock); return r; } int gpmc_cs_request(int cs, unsigned long size, unsigned long *base) { struct resource *res = &gpmc_cs_mem[cs]; int r = -1; if (cs > GPMC_CS_NUM) return -ENODEV; size = gpmc_mem_align(size); if (size > (1 << GPMC_SECTION_SHIFT)) return -ENOMEM; spin_lock(&gpmc_mem_lock); if (gpmc_cs_reserved(cs)) { r = -EBUSY; goto out; } if (gpmc_cs_mem_enabled(cs)) r = adjust_resource(res, res->start & ~(size - 1), size); if (r < 0) r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0, size, NULL, NULL); if (r < 0) goto out; gpmc_cs_enable_mem(cs, res->start, resource_size(res)); *base = res->start; gpmc_cs_set_reserved(cs, 1); out: spin_unlock(&gpmc_mem_lock); return r; } EXPORT_SYMBOL(gpmc_cs_request); void gpmc_cs_free(int cs) { spin_lock(&gpmc_mem_lock); if (cs >= GPMC_CS_NUM || cs < 0 || !gpmc_cs_reserved(cs)) { printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs); BUG(); spin_unlock(&gpmc_mem_lock); return; } gpmc_cs_disable_mem(cs); release_resource(&gpmc_cs_mem[cs]); gpmc_cs_set_reserved(cs, 0); spin_unlock(&gpmc_mem_lock); } EXPORT_SYMBOL(gpmc_cs_free); /** * gpmc_read_status - read access request to get the different gpmc status * @cmd: command type * @return status */ int gpmc_read_status(int cmd) { int status = -EINVAL; u32 regval = 0; switch (cmd) { case GPMC_GET_IRQ_STATUS: status = gpmc_read_reg(GPMC_IRQSTATUS); break; case GPMC_PREFETCH_FIFO_CNT: regval = gpmc_read_reg(GPMC_PREFETCH_STATUS); status = GPMC_PREFETCH_STATUS_FIFO_CNT(regval); break; case GPMC_PREFETCH_COUNT: regval = gpmc_read_reg(GPMC_PREFETCH_STATUS); status = GPMC_PREFETCH_STATUS_COUNT(regval); break; case GPMC_STATUS_BUFFER: regval = gpmc_read_reg(GPMC_STATUS); /* 1 : buffer is available to write */ status = regval & GPMC_STATUS_BUFF_EMPTY; break; default: printk(KERN_ERR "gpmc_read_status: Not supported\n"); } return status; } EXPORT_SYMBOL(gpmc_read_status); /** * gpmc_cs_configure - write request to configure gpmc * @cs: chip select number * @cmd: command type * @wval: value to write * @return status of the operation */ int gpmc_cs_configure(int cs, int cmd, int wval) { int err = 0; u32 regval = 0; switch (cmd) { case GPMC_SET_IRQ_STATUS: gpmc_write_reg(GPMC_IRQSTATUS, wval); break; case GPMC_CONFIG_WP: regval = gpmc_read_reg(GPMC_CONFIG); if (wval) regval &= ~GPMC_CONFIG_WRITEPROTECT; /* WP is ON */ else regval |= GPMC_CONFIG_WRITEPROTECT; /* WP is OFF */ gpmc_write_reg(GPMC_CONFIG, regval); break; case GPMC_CONFIG_RDY_BSY: regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1); if (wval) regval |= WR_RD_PIN_MONITORING; else regval &= ~WR_RD_PIN_MONITORING; gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval); break; case GPMC_CONFIG_DEV_SIZE: regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1); regval |= GPMC_CONFIG1_DEVICESIZE(wval); gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval); break; case GPMC_CONFIG_DEV_TYPE: regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1); regval |= GPMC_CONFIG1_DEVICETYPE(wval); if (wval == GPMC_DEVICETYPE_NOR) regval |= GPMC_CONFIG1_MUXADDDATA; gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval); break; default: printk(KERN_ERR "gpmc_configure_cs: Not supported\n"); err = -EINVAL; } return err; } EXPORT_SYMBOL(gpmc_cs_configure); /** * gpmc_nand_read - nand specific read access request * @cs: chip select number * @cmd: command type */ int gpmc_nand_read(int cs, int cmd) { int rval = -EINVAL; switch (cmd) { case GPMC_NAND_DATA: rval = gpmc_cs_read_byte(cs, GPMC_CS_NAND_DATA); break; default: printk(KERN_ERR "gpmc_read_nand_ctrl: Not supported\n"); } return rval; } EXPORT_SYMBOL(gpmc_nand_read); /** * gpmc_nand_write - nand specific write request * @cs: chip select number * @cmd: command type * @wval: value to write */ int gpmc_nand_write(int cs, int cmd, int wval) { int err = 0; switch (cmd) { case GPMC_NAND_COMMAND: gpmc_cs_write_byte(cs, GPMC_CS_NAND_COMMAND, wval); break; case GPMC_NAND_ADDRESS: gpmc_cs_write_byte(cs, GPMC_CS_NAND_ADDRESS, wval); break; case GPMC_NAND_DATA: gpmc_cs_write_byte(cs, GPMC_CS_NAND_DATA, wval); default: printk(KERN_ERR "gpmc_write_nand_ctrl: Not supported\n"); err = -EINVAL; } return err; } EXPORT_SYMBOL(gpmc_nand_write); /** * gpmc_prefetch_enable - configures and starts prefetch transfer * @cs: cs (chip select) number * @dma_mode: dma mode enable (1) or disable (0) * @u32_count: number of bytes to be transferred * @is_write: prefetch read(0) or write post(1) mode */ int gpmc_prefetch_enable(int cs, int dma_mode, unsigned int u32_count, int is_write) { if (!(gpmc_read_reg(GPMC_PREFETCH_CONTROL))) { /* Set the amount of bytes to be prefetched */ gpmc_write_reg(GPMC_PREFETCH_CONFIG2, u32_count); /* Set dma/mpu mode, the prefetch read / post write and * enable the engine. Set which cs is has requested for. */ gpmc_write_reg(GPMC_PREFETCH_CONFIG1, ((cs << CS_NUM_SHIFT) | PREFETCH_FIFOTHRESHOLD | ENABLE_PREFETCH | (dma_mode << DMA_MPU_MODE) | (0x1 & is_write))); /* Start the prefetch engine */ gpmc_write_reg(GPMC_PREFETCH_CONTROL, 0x1); } else { return -EBUSY; } return 0; } EXPORT_SYMBOL(gpmc_prefetch_enable); /** * gpmc_prefetch_reset - disables and stops the prefetch engine */ int gpmc_prefetch_reset(int cs) { u32 config1; /* check if the same module/cs is trying to reset */ config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1); if (((config1 >> CS_NUM_SHIFT) & 0x7) != cs) return -EINVAL; /* Stop the PFPW engine */ gpmc_write_reg(GPMC_PREFETCH_CONTROL, 0x0); /* Reset/disable the PFPW engine */ gpmc_write_reg(GPMC_PREFETCH_CONFIG1, 0x0); return 0; } EXPORT_SYMBOL(gpmc_prefetch_reset); static void __init gpmc_mem_init(void) { int cs; unsigned long boot_rom_space = 0; /* never allocate the first page, to facilitate bug detection; * even if we didn't boot from ROM. */ boot_rom_space = BOOT_ROM_SPACE; /* In apollon the CS0 is mapped as 0x0000 0000 */ if (machine_is_omap_apollon()) boot_rom_space = 0; gpmc_mem_root.start = GPMC_MEM_START + boot_rom_space; gpmc_mem_root.end = GPMC_MEM_END; /* Reserve all regions that has been set up by bootloader */ for (cs = 0; cs < GPMC_CS_NUM; cs++) { u32 base, size; if (!gpmc_cs_mem_enabled(cs)) continue; gpmc_cs_get_memconf(cs, &base, &size); if (gpmc_cs_insert_mem(cs, base, size) < 0) BUG(); } } void __init gpmc_init(void) { u32 l; char *ck = NULL; if (cpu_is_omap24xx()) { ck = "core_l3_ck"; if (cpu_is_omap2420()) l = OMAP2420_GPMC_BASE; else l = OMAP34XX_GPMC_BASE; } else if (cpu_is_omap34xx()) { ck = "gpmc_fck"; l = OMAP34XX_GPMC_BASE; } else if (cpu_is_omap44xx()) { ck = "gpmc_ck"; l = OMAP44XX_GPMC_BASE; } if (WARN_ON(!ck)) return; gpmc_l3_clk = clk_get(NULL, ck); if (IS_ERR(gpmc_l3_clk)) { printk(KERN_ERR "Could not get GPMC clock %s\n", ck); BUG(); } gpmc_base = ioremap(l, SZ_4K); if (!gpmc_base) { clk_put(gpmc_l3_clk); printk(KERN_ERR "Could not get GPMC register memory\n"); BUG(); } clk_enable(gpmc_l3_clk); l = gpmc_read_reg(GPMC_REVISION); printk(KERN_INFO "GPMC revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f); /* Set smart idle mode and automatic L3 clock gating */ l = gpmc_read_reg(GPMC_SYSCONFIG); l &= 0x03 << 3; l |= (0x02 << 3) | (1 << 0); gpmc_write_reg(GPMC_SYSCONFIG, l); gpmc_mem_init(); } #ifdef CONFIG_ARCH_OMAP3 static struct omap3_gpmc_regs gpmc_context; void omap3_gpmc_save_context(void) { int i; gpmc_context.sysconfig = gpmc_read_reg(GPMC_SYSCONFIG); gpmc_context.irqenable = gpmc_read_reg(GPMC_IRQENABLE); gpmc_context.timeout_ctrl = gpmc_read_reg(GPMC_TIMEOUT_CONTROL); gpmc_context.config = gpmc_read_reg(GPMC_CONFIG); gpmc_context.prefetch_config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1); gpmc_context.prefetch_config2 = gpmc_read_reg(GPMC_PREFETCH_CONFIG2); gpmc_context.prefetch_control = gpmc_read_reg(GPMC_PREFETCH_CONTROL); for (i = 0; i < GPMC_CS_NUM; i++) { gpmc_context.cs_context[i].is_valid = gpmc_cs_mem_enabled(i); if (gpmc_context.cs_context[i].is_valid) { gpmc_context.cs_context[i].config1 = gpmc_cs_read_reg(i, GPMC_CS_CONFIG1); gpmc_context.cs_context[i].config2 = gpmc_cs_read_reg(i, GPMC_CS_CONFIG2); gpmc_context.cs_context[i].config3 = gpmc_cs_read_reg(i, GPMC_CS_CONFIG3); gpmc_context.cs_context[i].config4 = gpmc_cs_read_reg(i, GPMC_CS_CONFIG4); gpmc_context.cs_context[i].config5 = gpmc_cs_read_reg(i, GPMC_CS_CONFIG5); gpmc_context.cs_context[i].config6 = gpmc_cs_read_reg(i, GPMC_CS_CONFIG6); gpmc_context.cs_context[i].config7 = gpmc_cs_read_reg(i, GPMC_CS_CONFIG7); } } } void omap3_gpmc_restore_context(void) { int i; gpmc_write_reg(GPMC_SYSCONFIG, gpmc_context.sysconfig); gpmc_write_reg(GPMC_IRQENABLE, gpmc_context.irqenable); gpmc_write_reg(GPMC_TIMEOUT_CONTROL, gpmc_context.timeout_ctrl); gpmc_write_reg(GPMC_CONFIG, gpmc_context.config); gpmc_write_reg(GPMC_PREFETCH_CONFIG1, gpmc_context.prefetch_config1); gpmc_write_reg(GPMC_PREFETCH_CONFIG2, gpmc_context.prefetch_config2); gpmc_write_reg(GPMC_PREFETCH_CONTROL, gpmc_context.prefetch_control); for (i = 0; i < GPMC_CS_NUM; i++) { if (gpmc_context.cs_context[i].is_valid) { gpmc_cs_write_reg(i, GPMC_CS_CONFIG1, gpmc_context.cs_context[i].config1); gpmc_cs_write_reg(i, GPMC_CS_CONFIG2, gpmc_context.cs_context[i].config2); gpmc_cs_write_reg(i, GPMC_CS_CONFIG3, gpmc_context.cs_context[i].config3); gpmc_cs_write_reg(i, GPMC_CS_CONFIG4, gpmc_context.cs_context[i].config4); gpmc_cs_write_reg(i, GPMC_CS_CONFIG5, gpmc_context.cs_context[i].config5); gpmc_cs_write_reg(i, GPMC_CS_CONFIG6, gpmc_context.cs_context[i].config6); gpmc_cs_write_reg(i, GPMC_CS_CONFIG7, gpmc_context.cs_context[i].config7); } } } #endif /* CONFIG_ARCH_OMAP3 */ /** * gpmc_enable_hwecc - enable hardware ecc functionality * @cs: chip select number * @mode: read/write mode * @dev_width: device bus width(1 for x16, 0 for x8) * @ecc_size: bytes for which ECC will be generated */ int gpmc_enable_hwecc(int cs, int mode, int dev_width, int ecc_size) { unsigned int val; /* check if ecc module is in used */ if (gpmc_ecc_used != -EINVAL) return -EINVAL; gpmc_ecc_used = cs; /* clear ecc and enable bits */ val = ((0x00000001<<8) | 0x00000001); gpmc_write_reg(GPMC_ECC_CONTROL, val); /* program ecc and result sizes */ val = ((((ecc_size >> 1) - 1) << 22) | (0x0000000F)); gpmc_write_reg(GPMC_ECC_SIZE_CONFIG, val); switch (mode) { case GPMC_ECC_READ: gpmc_write_reg(GPMC_ECC_CONTROL, 0x101); break; case GPMC_ECC_READSYN: gpmc_write_reg(GPMC_ECC_CONTROL, 0x100); break; case GPMC_ECC_WRITE: gpmc_write_reg(GPMC_ECC_CONTROL, 0x101); break; default: printk(KERN_INFO "Error: Unrecognized Mode[%d]!\n", mode); break; } /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */ val = (dev_width << 7) | (cs << 1) | (0x1); gpmc_write_reg(GPMC_ECC_CONFIG, val); return 0; } /** * gpmc_calculate_ecc - generate non-inverted ecc bytes * @cs: chip select number * @dat: data pointer over which ecc is computed * @ecc_code: ecc code buffer * * Using non-inverted ECC is considered ugly since writing a blank * page (padding) will clear the ECC bytes. This is not a problem as long * no one is trying to write data on the seemingly unused page. Reading * an erased page will produce an ECC mismatch between generated and read * ECC bytes that has to be dealt with separately. */ int gpmc_calculate_ecc(int cs, const u_char *dat, u_char *ecc_code) { unsigned int val = 0x0; if (gpmc_ecc_used != cs) return -EINVAL; /* read ecc result */ val = gpmc_read_reg(GPMC_ECC1_RESULT); *ecc_code++ = val; /* P128e, ..., P1e */ *ecc_code++ = val >> 16; /* P128o, ..., P1o */ /* P2048o, P1024o, P512o, P256o, P2048e, P1024e, P512e, P256e */ *ecc_code++ = ((val >> 8) & 0x0f) | ((val >> 20) & 0xf0); gpmc_ecc_used = -EINVAL; return 0; }