| /* |
| * GPMC support functions |
| * |
| * Copyright (C) 2005-2006 Nokia Corporation |
| * |
| * Author: Juha Yrjola |
| * |
| * Copyright (C) 2009 Texas Instruments |
| * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.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. |
| */ |
| #undef DEBUG |
| |
| #include <linux/irq.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/err.h> |
| #include <linux/clk.h> |
| #include <linux/ioport.h> |
| #include <linux/spinlock.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| |
| #include <linux/platform_data/mtd-nand-omap2.h> |
| |
| #include <asm/mach-types.h> |
| |
| #include "soc.h" |
| #include "common.h" |
| #include "omap_device.h" |
| #include "gpmc.h" |
| |
| #define DEVICE_NAME "omap-gpmc" |
| |
| /* 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_ECC_BCH_RESULT_0 0x240 /* not available on OMAP2 */ |
| #define GPMC_ECC_BCH_RESULT_1 0x244 /* not available on OMAP2 */ |
| #define GPMC_ECC_BCH_RESULT_2 0x248 /* not available on OMAP2 */ |
| #define GPMC_ECC_BCH_RESULT_3 0x24c /* not available on OMAP2 */ |
| |
| /* GPMC ECC control settings */ |
| #define GPMC_ECC_CTRL_ECCCLEAR 0x100 |
| #define GPMC_ECC_CTRL_ECCDISABLE 0x000 |
| #define GPMC_ECC_CTRL_ECCREG1 0x001 |
| #define GPMC_ECC_CTRL_ECCREG2 0x002 |
| #define GPMC_ECC_CTRL_ECCREG3 0x003 |
| #define GPMC_ECC_CTRL_ECCREG4 0x004 |
| #define GPMC_ECC_CTRL_ECCREG5 0x005 |
| #define GPMC_ECC_CTRL_ECCREG6 0x006 |
| #define GPMC_ECC_CTRL_ECCREG7 0x007 |
| #define GPMC_ECC_CTRL_ECCREG8 0x008 |
| #define GPMC_ECC_CTRL_ECCREG9 0x009 |
| |
| #define GPMC_CS0_OFFSET 0x60 |
| #define GPMC_CS_SIZE 0x30 |
| #define GPMC_BCH_SIZE 0x10 |
| |
| #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 CS_NUM_SHIFT 24 |
| #define ENABLE_PREFETCH (0x1 << 7) |
| #define DMA_MPU_MODE 2 |
| |
| #define GPMC_REVISION_MAJOR(l) ((l >> 4) & 0xf) |
| #define GPMC_REVISION_MINOR(l) (l & 0xf) |
| |
| #define GPMC_HAS_WR_ACCESS 0x1 |
| #define GPMC_HAS_WR_DATA_MUX_BUS 0x2 |
| |
| /* XXX: Only NAND irq has been considered,currently these are the only ones used |
| */ |
| #define GPMC_NR_IRQ 2 |
| |
| struct gpmc_client_irq { |
| unsigned irq; |
| u32 bitmask; |
| }; |
| |
| /* 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 gpmc_client_irq gpmc_client_irq[GPMC_NR_IRQ]; |
| static struct irq_chip gpmc_irq_chip; |
| static unsigned gpmc_irq_start; |
| |
| 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 struct device *gpmc_dev; |
| static int gpmc_irq; |
| static resource_size_t phys_base, mem_size; |
| static unsigned gpmc_capability; |
| static void __iomem *gpmc_base; |
| |
| static struct clk *gpmc_l3_clk; |
| |
| static irqreturn_t gpmc_handle_irq(int irq, void *dev); |
| |
| 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); |
| } |
| |
| 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_ps_to_ticks(unsigned int time_ps) |
| { |
| unsigned long tick_ps; |
| |
| /* Calculate in picosecs to yield more exact results */ |
| tick_ps = gpmc_get_fclk_period(); |
| |
| return (time_ps + 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_calc_divider(unsigned int sync_clk) |
| { |
| int div; |
| u32 l; |
| |
| l = sync_clk + (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_calc_divider(t->sync_clk); |
| if (div < 0) |
| return div; |
| |
| 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 (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS) |
| GPMC_SET_ONE(GPMC_CS_CONFIG6, 16, 19, wr_data_mux_bus); |
| if (gpmc_capability & GPMC_HAS_WR_ACCESS) |
| 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; |
| } |
| |
| static int gpmc_cs_delete_mem(int cs) |
| { |
| struct resource *res = &gpmc_cs_mem[cs]; |
| int r; |
| |
| spin_lock(&gpmc_mem_lock); |
| r = release_resource(&gpmc_cs_mem[cs]); |
| res->start = 0; |
| res->end = 0; |
| 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_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_ENABLE_IRQ: |
| gpmc_write_reg(GPMC_IRQENABLE, wval); |
| break; |
| |
| 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); |
| |
| /* clear 2 target bits */ |
| regval &= ~GPMC_CONFIG1_DEVICESIZE(3); |
| |
| /* set the proper value */ |
| 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); |
| |
| void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs) |
| { |
| int i; |
| |
| reg->gpmc_status = gpmc_base + GPMC_STATUS; |
| reg->gpmc_nand_command = gpmc_base + GPMC_CS0_OFFSET + |
| GPMC_CS_NAND_COMMAND + GPMC_CS_SIZE * cs; |
| reg->gpmc_nand_address = gpmc_base + GPMC_CS0_OFFSET + |
| GPMC_CS_NAND_ADDRESS + GPMC_CS_SIZE * cs; |
| reg->gpmc_nand_data = gpmc_base + GPMC_CS0_OFFSET + |
| GPMC_CS_NAND_DATA + GPMC_CS_SIZE * cs; |
| reg->gpmc_prefetch_config1 = gpmc_base + GPMC_PREFETCH_CONFIG1; |
| reg->gpmc_prefetch_config2 = gpmc_base + GPMC_PREFETCH_CONFIG2; |
| reg->gpmc_prefetch_control = gpmc_base + GPMC_PREFETCH_CONTROL; |
| reg->gpmc_prefetch_status = gpmc_base + GPMC_PREFETCH_STATUS; |
| reg->gpmc_ecc_config = gpmc_base + GPMC_ECC_CONFIG; |
| reg->gpmc_ecc_control = gpmc_base + GPMC_ECC_CONTROL; |
| reg->gpmc_ecc_size_config = gpmc_base + GPMC_ECC_SIZE_CONFIG; |
| reg->gpmc_ecc1_result = gpmc_base + GPMC_ECC1_RESULT; |
| |
| for (i = 0; i < GPMC_BCH_NUM_REMAINDER; i++) { |
| reg->gpmc_bch_result0[i] = gpmc_base + GPMC_ECC_BCH_RESULT_0 + |
| GPMC_BCH_SIZE * i; |
| reg->gpmc_bch_result1[i] = gpmc_base + GPMC_ECC_BCH_RESULT_1 + |
| GPMC_BCH_SIZE * i; |
| reg->gpmc_bch_result2[i] = gpmc_base + GPMC_ECC_BCH_RESULT_2 + |
| GPMC_BCH_SIZE * i; |
| reg->gpmc_bch_result3[i] = gpmc_base + GPMC_ECC_BCH_RESULT_3 + |
| GPMC_BCH_SIZE * i; |
| } |
| } |
| |
| int gpmc_get_client_irq(unsigned irq_config) |
| { |
| int i; |
| |
| if (hweight32(irq_config) > 1) |
| return 0; |
| |
| for (i = 0; i < GPMC_NR_IRQ; i++) |
| if (gpmc_client_irq[i].bitmask & irq_config) |
| return gpmc_client_irq[i].irq; |
| |
| return 0; |
| } |
| |
| static int gpmc_irq_endis(unsigned irq, bool endis) |
| { |
| int i; |
| u32 regval; |
| |
| for (i = 0; i < GPMC_NR_IRQ; i++) |
| if (irq == gpmc_client_irq[i].irq) { |
| regval = gpmc_read_reg(GPMC_IRQENABLE); |
| if (endis) |
| regval |= gpmc_client_irq[i].bitmask; |
| else |
| regval &= ~gpmc_client_irq[i].bitmask; |
| gpmc_write_reg(GPMC_IRQENABLE, regval); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static void gpmc_irq_disable(struct irq_data *p) |
| { |
| gpmc_irq_endis(p->irq, false); |
| } |
| |
| static void gpmc_irq_enable(struct irq_data *p) |
| { |
| gpmc_irq_endis(p->irq, true); |
| } |
| |
| static void gpmc_irq_noop(struct irq_data *data) { } |
| |
| static unsigned int gpmc_irq_noop_ret(struct irq_data *data) { return 0; } |
| |
| static int gpmc_setup_irq(void) |
| { |
| int i; |
| u32 regval; |
| |
| if (!gpmc_irq) |
| return -EINVAL; |
| |
| gpmc_irq_start = irq_alloc_descs(-1, 0, GPMC_NR_IRQ, 0); |
| if (IS_ERR_VALUE(gpmc_irq_start)) { |
| pr_err("irq_alloc_descs failed\n"); |
| return gpmc_irq_start; |
| } |
| |
| gpmc_irq_chip.name = "gpmc"; |
| gpmc_irq_chip.irq_startup = gpmc_irq_noop_ret; |
| gpmc_irq_chip.irq_enable = gpmc_irq_enable; |
| gpmc_irq_chip.irq_disable = gpmc_irq_disable; |
| gpmc_irq_chip.irq_shutdown = gpmc_irq_noop; |
| gpmc_irq_chip.irq_ack = gpmc_irq_noop; |
| gpmc_irq_chip.irq_mask = gpmc_irq_noop; |
| gpmc_irq_chip.irq_unmask = gpmc_irq_noop; |
| |
| gpmc_client_irq[0].bitmask = GPMC_IRQ_FIFOEVENTENABLE; |
| gpmc_client_irq[1].bitmask = GPMC_IRQ_COUNT_EVENT; |
| |
| for (i = 0; i < GPMC_NR_IRQ; i++) { |
| gpmc_client_irq[i].irq = gpmc_irq_start + i; |
| irq_set_chip_and_handler(gpmc_client_irq[i].irq, |
| &gpmc_irq_chip, handle_simple_irq); |
| set_irq_flags(gpmc_client_irq[i].irq, |
| IRQF_VALID | IRQF_NOAUTOEN); |
| } |
| |
| /* Disable interrupts */ |
| gpmc_write_reg(GPMC_IRQENABLE, 0); |
| |
| /* clear interrupts */ |
| regval = gpmc_read_reg(GPMC_IRQSTATUS); |
| gpmc_write_reg(GPMC_IRQSTATUS, regval); |
| |
| return request_irq(gpmc_irq, gpmc_handle_irq, 0, "gpmc", NULL); |
| } |
| |
| static __devexit int gpmc_free_irq(void) |
| { |
| int i; |
| |
| if (gpmc_irq) |
| free_irq(gpmc_irq, NULL); |
| |
| for (i = 0; i < GPMC_NR_IRQ; i++) { |
| irq_set_handler(gpmc_client_irq[i].irq, NULL); |
| irq_set_chip(gpmc_client_irq[i].irq, &no_irq_chip); |
| irq_modify_status(gpmc_client_irq[i].irq, 0, 0); |
| } |
| |
| irq_free_descs(gpmc_irq_start, GPMC_NR_IRQ); |
| |
| return 0; |
| } |
| |
| static void __devexit gpmc_mem_exit(void) |
| { |
| int cs; |
| |
| for (cs = 0; cs < GPMC_CS_NUM; cs++) { |
| if (!gpmc_cs_mem_enabled(cs)) |
| continue; |
| gpmc_cs_delete_mem(cs); |
| } |
| |
| } |
| |
| static int __devinit gpmc_mem_init(void) |
| { |
| int cs, rc; |
| 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); |
| rc = gpmc_cs_insert_mem(cs, base, size); |
| if (IS_ERR_VALUE(rc)) { |
| while (--cs >= 0) |
| if (gpmc_cs_mem_enabled(cs)) |
| gpmc_cs_delete_mem(cs); |
| return rc; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static __devinit int gpmc_probe(struct platform_device *pdev) |
| { |
| int rc; |
| u32 l; |
| struct resource *res; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (res == NULL) |
| return -ENOENT; |
| |
| phys_base = res->start; |
| mem_size = resource_size(res); |
| |
| gpmc_base = devm_request_and_ioremap(&pdev->dev, res); |
| if (!gpmc_base) { |
| dev_err(&pdev->dev, "error: request memory / ioremap\n"); |
| return -EADDRNOTAVAIL; |
| } |
| |
| res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| if (res == NULL) |
| dev_warn(&pdev->dev, "Failed to get resource: irq\n"); |
| else |
| gpmc_irq = res->start; |
| |
| gpmc_l3_clk = clk_get(&pdev->dev, "fck"); |
| if (IS_ERR(gpmc_l3_clk)) { |
| dev_err(&pdev->dev, "error: clk_get\n"); |
| gpmc_irq = 0; |
| return PTR_ERR(gpmc_l3_clk); |
| } |
| |
| clk_prepare_enable(gpmc_l3_clk); |
| |
| gpmc_dev = &pdev->dev; |
| |
| l = gpmc_read_reg(GPMC_REVISION); |
| if (GPMC_REVISION_MAJOR(l) > 0x4) |
| gpmc_capability = GPMC_HAS_WR_ACCESS | GPMC_HAS_WR_DATA_MUX_BUS; |
| dev_info(gpmc_dev, "GPMC revision %d.%d\n", GPMC_REVISION_MAJOR(l), |
| GPMC_REVISION_MINOR(l)); |
| |
| rc = gpmc_mem_init(); |
| if (IS_ERR_VALUE(rc)) { |
| clk_disable_unprepare(gpmc_l3_clk); |
| clk_put(gpmc_l3_clk); |
| dev_err(gpmc_dev, "failed to reserve memory\n"); |
| return rc; |
| } |
| |
| if (IS_ERR_VALUE(gpmc_setup_irq())) |
| dev_warn(gpmc_dev, "gpmc_setup_irq failed\n"); |
| |
| return 0; |
| } |
| |
| static __devexit int gpmc_remove(struct platform_device *pdev) |
| { |
| gpmc_free_irq(); |
| gpmc_mem_exit(); |
| gpmc_dev = NULL; |
| return 0; |
| } |
| |
| static struct platform_driver gpmc_driver = { |
| .probe = gpmc_probe, |
| .remove = __devexit_p(gpmc_remove), |
| .driver = { |
| .name = DEVICE_NAME, |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| static __init int gpmc_init(void) |
| { |
| return platform_driver_register(&gpmc_driver); |
| } |
| |
| static __exit void gpmc_exit(void) |
| { |
| platform_driver_unregister(&gpmc_driver); |
| |
| } |
| |
| postcore_initcall(gpmc_init); |
| module_exit(gpmc_exit); |
| |
| static int __init omap_gpmc_init(void) |
| { |
| struct omap_hwmod *oh; |
| struct platform_device *pdev; |
| char *oh_name = "gpmc"; |
| |
| oh = omap_hwmod_lookup(oh_name); |
| if (!oh) { |
| pr_err("Could not look up %s\n", oh_name); |
| return -ENODEV; |
| } |
| |
| pdev = omap_device_build(DEVICE_NAME, -1, oh, NULL, 0, NULL, 0, 0); |
| WARN(IS_ERR(pdev), "could not build omap_device for %s\n", oh_name); |
| |
| return IS_ERR(pdev) ? PTR_ERR(pdev) : 0; |
| } |
| postcore_initcall(omap_gpmc_init); |
| |
| static irqreturn_t gpmc_handle_irq(int irq, void *dev) |
| { |
| int i; |
| u32 regval; |
| |
| regval = gpmc_read_reg(GPMC_IRQSTATUS); |
| |
| if (!regval) |
| return IRQ_NONE; |
| |
| for (i = 0; i < GPMC_NR_IRQ; i++) |
| if (regval & gpmc_client_irq[i].bitmask) |
| generic_handle_irq(gpmc_client_irq[i].irq); |
| |
| gpmc_write_reg(GPMC_IRQSTATUS, regval); |
| |
| return IRQ_HANDLED; |
| } |
| |
| #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 */ |