--- /dev/null
+/*
+ * linux/arch/arm/mach-omap2/gpmc-onenand.c
+ *
+ * Copyright (C) 2006 - 2009 Nokia Corporation
+ * Contacts: Juha Yrjola
+ * Tony Lindgren
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/mtd/onenand_regs.h>
+#include <linux/io.h>
+
+#include <asm/mach/flash.h>
+
+#include <mach/onenand.h>
+#include <mach/board.h>
+#include <mach/gpmc.h>
+
+static struct omap_onenand_platform_data *gpmc_onenand_data;
+
+static struct platform_device gpmc_onenand_device = {
+ .name = "omap2-onenand",
+ .id = -1,
+};
+
+static int omap2_onenand_set_async_mode(int cs, void __iomem *onenand_base)
+{
+ struct gpmc_timings t;
+
+ const int t_cer = 15;
+ const int t_avdp = 12;
+ const int t_aavdh = 7;
+ const int t_ce = 76;
+ const int t_aa = 76;
+ const int t_oe = 20;
+ const int t_cez = 20; /* max of t_cez, t_oez */
+ const int t_ds = 30;
+ const int t_wpl = 40;
+ const int t_wph = 30;
+
+ memset(&t, 0, sizeof(t));
+ t.sync_clk = 0;
+ t.cs_on = 0;
+ t.adv_on = 0;
+
+ /* Read */
+ t.adv_rd_off = gpmc_round_ns_to_ticks(max_t(int, t_avdp, t_cer));
+ t.oe_on = t.adv_rd_off + gpmc_round_ns_to_ticks(t_aavdh);
+ t.access = t.adv_on + gpmc_round_ns_to_ticks(t_aa);
+ t.access = max_t(int, t.access, t.cs_on + gpmc_round_ns_to_ticks(t_ce));
+ t.access = max_t(int, t.access, t.oe_on + gpmc_round_ns_to_ticks(t_oe));
+ t.oe_off = t.access + gpmc_round_ns_to_ticks(1);
+ t.cs_rd_off = t.oe_off;
+ t.rd_cycle = t.cs_rd_off + gpmc_round_ns_to_ticks(t_cez);
+
+ /* Write */
+ t.adv_wr_off = t.adv_rd_off;
+ t.we_on = t.oe_on;
+ if (cpu_is_omap34xx()) {
+ t.wr_data_mux_bus = t.we_on;
+ t.wr_access = t.we_on + gpmc_round_ns_to_ticks(t_ds);
+ }
+ t.we_off = t.we_on + gpmc_round_ns_to_ticks(t_wpl);
+ t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph);
+ t.wr_cycle = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez);
+
+ /* Configure GPMC for asynchronous read */
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
+ GPMC_CONFIG1_DEVICESIZE_16 |
+ GPMC_CONFIG1_MUXADDDATA);
+
+ return gpmc_cs_set_timings(cs, &t);
+}
+
+static void set_onenand_cfg(void __iomem *onenand_base, int latency,
+ int sync_read, int sync_write, int hf)
+{
+ u32 reg;
+
+ reg = readw(onenand_base + ONENAND_REG_SYS_CFG1);
+ reg &= ~((0x7 << ONENAND_SYS_CFG1_BRL_SHIFT) | (0x7 << 9));
+ reg |= (latency << ONENAND_SYS_CFG1_BRL_SHIFT) |
+ ONENAND_SYS_CFG1_BL_16;
+ if (sync_read)
+ reg |= ONENAND_SYS_CFG1_SYNC_READ;
+ else
+ reg &= ~ONENAND_SYS_CFG1_SYNC_READ;
+ if (sync_write)
+ reg |= ONENAND_SYS_CFG1_SYNC_WRITE;
+ else
+ reg &= ~ONENAND_SYS_CFG1_SYNC_WRITE;
+ if (hf)
+ reg |= ONENAND_SYS_CFG1_HF;
+ else
+ reg &= ~ONENAND_SYS_CFG1_HF;
+ writew(reg, onenand_base + ONENAND_REG_SYS_CFG1);
+}
+
+static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg,
+ void __iomem *onenand_base,
+ int freq)
+{
+ struct gpmc_timings t;
+ const int t_cer = 15;
+ const int t_avdp = 12;
+ const int t_cez = 20; /* max of t_cez, t_oez */
+ const int t_ds = 30;
+ const int t_wpl = 40;
+ const int t_wph = 30;
+ int min_gpmc_clk_period, t_ces, t_avds, t_avdh, t_ach, t_aavdh, t_rdyo;
+ int tick_ns, div, fclk_offset_ns, fclk_offset, gpmc_clk_ns, latency;
+ int first_time = 0, hf = 0, sync_read = 0, sync_write = 0;
+ int err, ticks_cez;
+ int cs = cfg->cs;
+ u32 reg;
+
+ if (cfg->flags & ONENAND_SYNC_READ) {
+ sync_read = 1;
+ } else if (cfg->flags & ONENAND_SYNC_READWRITE) {
+ sync_read = 1;
+ sync_write = 1;
+ }
+
+ if (!freq) {
+ /* Very first call freq is not known */
+ err = omap2_onenand_set_async_mode(cs, onenand_base);
+ if (err)
+ return err;
+ reg = readw(onenand_base + ONENAND_REG_VERSION_ID);
+ switch ((reg >> 4) & 0xf) {
+ case 0:
+ freq = 40;
+ break;
+ case 1:
+ freq = 54;
+ break;
+ case 2:
+ freq = 66;
+ break;
+ case 3:
+ freq = 83;
+ break;
+ case 4:
+ freq = 104;
+ break;
+ default:
+ freq = 54;
+ break;
+ }
+ first_time = 1;
+ }
+
+ switch (freq) {
+ case 83:
+ min_gpmc_clk_period = 12; /* 83 MHz */
+ t_ces = 5;
+ t_avds = 4;
+ t_avdh = 2;
+ t_ach = 6;
+ t_aavdh = 6;
+ t_rdyo = 9;
+ break;
+ case 66:
+ min_gpmc_clk_period = 15; /* 66 MHz */
+ t_ces = 6;
+ t_avds = 5;
+ t_avdh = 2;
+ t_ach = 6;
+ t_aavdh = 6;
+ t_rdyo = 11;
+ break;
+ default:
+ min_gpmc_clk_period = 18; /* 54 MHz */
+ t_ces = 7;
+ t_avds = 7;
+ t_avdh = 7;
+ t_ach = 9;
+ t_aavdh = 7;
+ t_rdyo = 15;
+ sync_write = 0;
+ break;
+ }
+
+ tick_ns = gpmc_ticks_to_ns(1);
+ div = gpmc_cs_calc_divider(cs, min_gpmc_clk_period);
+ gpmc_clk_ns = gpmc_ticks_to_ns(div);
+ if (gpmc_clk_ns < 15) /* >66Mhz */
+ hf = 1;
+ if (hf)
+ latency = 6;
+ else if (gpmc_clk_ns >= 25) /* 40 MHz*/
+ latency = 3;
+ else
+ latency = 4;
+
+ if (first_time)
+ set_onenand_cfg(onenand_base, latency,
+ sync_read, sync_write, hf);
+
+ if (div == 1) {
+ reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
+ reg |= (1 << 7);
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg);
+ reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3);
+ reg |= (1 << 7);
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg);
+ reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4);
+ reg |= (1 << 7);
+ reg |= (1 << 23);
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg);
+ } else {
+ reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2);
+ reg &= ~(1 << 7);
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg);
+ reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3);
+ reg &= ~(1 << 7);
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg);
+ reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4);
+ reg &= ~(1 << 7);
+ reg &= ~(1 << 23);
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg);
+ }
+
+ /* Set synchronous read timings */
+ memset(&t, 0, sizeof(t));
+ t.sync_clk = min_gpmc_clk_period;
+ t.cs_on = 0;
+ t.adv_on = 0;
+ fclk_offset_ns = gpmc_round_ns_to_ticks(max_t(int, t_ces, t_avds));
+ fclk_offset = gpmc_ns_to_ticks(fclk_offset_ns);
+ t.page_burst_access = gpmc_clk_ns;
+
+ /* Read */
+ t.adv_rd_off = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_avdh));
+ t.oe_on = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_ach));
+ t.access = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div);
+ t.oe_off = t.access + gpmc_round_ns_to_ticks(1);
+ t.cs_rd_off = t.oe_off;
+ ticks_cez = ((gpmc_ns_to_ticks(t_cez) + div - 1) / div) * div;
+ t.rd_cycle = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div +
+ ticks_cez);
+
+ /* Write */
+ if (sync_write) {
+ t.adv_wr_off = t.adv_rd_off;
+ t.we_on = 0;
+ t.we_off = t.cs_rd_off;
+ t.cs_wr_off = t.cs_rd_off;
+ t.wr_cycle = t.rd_cycle;
+ if (cpu_is_omap34xx()) {
+ t.wr_data_mux_bus = gpmc_ticks_to_ns(fclk_offset +
+ gpmc_ns_to_ticks(min_gpmc_clk_period +
+ t_rdyo));
+ t.wr_access = t.access;
+ }
+ } else {
+ t.adv_wr_off = gpmc_round_ns_to_ticks(max_t(int,
+ t_avdp, t_cer));
+ t.we_on = t.adv_wr_off + gpmc_round_ns_to_ticks(t_aavdh);
+ t.we_off = t.we_on + gpmc_round_ns_to_ticks(t_wpl);
+ t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph);
+ t.wr_cycle = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez);
+ if (cpu_is_omap34xx()) {
+ t.wr_data_mux_bus = t.we_on;
+ t.wr_access = t.we_on + gpmc_round_ns_to_ticks(t_ds);
+ }
+ }
+
+ /* Configure GPMC for synchronous read */
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1,
+ GPMC_CONFIG1_WRAPBURST_SUPP |
+ GPMC_CONFIG1_READMULTIPLE_SUPP |
+ (sync_read ? GPMC_CONFIG1_READTYPE_SYNC : 0) |
+ (sync_write ? GPMC_CONFIG1_WRITEMULTIPLE_SUPP : 0) |
+ (sync_write ? GPMC_CONFIG1_WRITETYPE_SYNC : 0) |
+ GPMC_CONFIG1_CLKACTIVATIONTIME(fclk_offset) |
+ GPMC_CONFIG1_PAGE_LEN(2) |
+ (cpu_is_omap34xx() ? 0 :
+ (GPMC_CONFIG1_WAIT_READ_MON |
+ GPMC_CONFIG1_WAIT_PIN_SEL(0))) |
+ GPMC_CONFIG1_DEVICESIZE_16 |
+ GPMC_CONFIG1_DEVICETYPE_NOR |
+ GPMC_CONFIG1_MUXADDDATA);
+
+ err = gpmc_cs_set_timings(cs, &t);
+ if (err)
+ return err;
+
+ set_onenand_cfg(onenand_base, latency, sync_read, sync_write, hf);
+
+ return 0;
+}
+
+static int gpmc_onenand_setup(void __iomem *onenand_base, int freq)
+{
+ struct device *dev = &gpmc_onenand_device.dev;
+
+ /* Set sync timings in GPMC */
+ if (omap2_onenand_set_sync_mode(gpmc_onenand_data, onenand_base,
+ freq) < 0) {
+ dev_err(dev, "Unable to set synchronous mode\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+void __init gpmc_onenand_init(struct omap_onenand_platform_data *_onenand_data)
+{
+ gpmc_onenand_data = _onenand_data;
+ gpmc_onenand_data->onenand_setup = gpmc_onenand_setup;
+ gpmc_onenand_device.dev.platform_data = gpmc_onenand_data;
+
+ if (cpu_is_omap24xx() &&
+ (gpmc_onenand_data->flags & ONENAND_SYNC_READWRITE)) {
+ printk(KERN_ERR "Onenand using only SYNC_READ on 24xx\n");
+ gpmc_onenand_data->flags &= ~ONENAND_SYNC_READWRITE;
+ gpmc_onenand_data->flags |= ONENAND_SYNC_READ;
+ }
+
+ if (platform_device_register(&gpmc_onenand_device) < 0) {
+ printk(KERN_ERR "Unable to register OneNAND device\n");
+ return;
+ }
+}
projects / linux-beck.git / commitdiff