#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
+#include <linux/ioport.h>
+#include <linux/spinlock.h>
#include <asm/io.h>
+#include <asm/mach-types.h>
#include <asm/arch/gpmc.h>
#undef DEBUG
+#ifdef CONFIG_ARCH_OMAP2420
#define GPMC_BASE 0x6800a000
+#endif
+
+#ifdef CONFIG_ARCH_OMAP2430
+#define GPMC_BASE 0x6E000000
+#endif
+
#define GPMC_REVISION 0x00
#define GPMC_SYSCONFIG 0x10
#define GPMC_SYSSTATUS 0x14
#define GPMC_CS0 0x60
#define GPMC_CS_SIZE 0x30
+#define GPMC_CS_NUM 8
+#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 */
+
+static struct resource gpmc_mem_root;
+static struct resource gpmc_cs_mem[GPMC_CS_NUM];
+static spinlock_t gpmc_mem_lock = SPIN_LOCK_UNLOCKED;
+static unsigned gpmc_cs_map;
+
static void __iomem *gpmc_base =
(void __iomem *) IO_ADDRESS(GPMC_BASE);
static void __iomem *gpmc_cs_base =
}
/* TODO: Add support for gpmc_fck to clock framework and use it */
-static unsigned long gpmc_get_fclk_period(void)
+unsigned long gpmc_get_fclk_period(void)
{
/* In picoseconds */
return 1000000000 / ((clk_get_rate(gpmc_l3_clk)) / 1000);
return (time_ns * 1000 + tick_ps - 1) / tick_ps;
}
+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
ticks = gpmc_ns_to_ticks(time);
nr_bits = end_bit - st_bit + 1;
- if (ticks >= 1 << nr_bits)
+ 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: %d ticks, %3lu ns (was %i ticks)\n",
+ 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);
+ (l >> st_bit) & mask, time);
#endif
l &= ~(mask << st_bit);
l |= ticks << st_bit;
div = l / gpmc_get_fclk_period();
if (div > 4)
return -1;
- if (div < 0)
+ if (div <= 0)
div = 1;
return div;
GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_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 (div %d)\n",
- cs, gpmc_get_fclk_period(), div);
+ 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);
+ }
- l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
- l &= ~0x03;
- l |= (div - 1);
+ 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 |= 1 << 6; /* 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 &= ~(1 << 6); /* 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 & (1 << 6);
+}
+
+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;
}
-unsigned long gpmc_cs_get_base_addr(int cs)
+int gpmc_cs_reserved(int cs)
{
- return (gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7) & 0x1f) << 24;
+ 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, res->end - res->start + 1);
+ *base = res->start;
+ gpmc_cs_set_reserved(cs, 1);
+out:
+ spin_unlock(&gpmc_mem_lock);
+ return r;
+}
+
+void gpmc_cs_free(int cs)
+{
+ spin_lock(&gpmc_mem_lock);
+ if (cs >= GPMC_CS_NUM || !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);
+}
+
+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)
l &= 0x03 << 3;
l |= (0x02 << 3) | (1 << 0);
gpmc_write_reg(GPMC_SYSCONFIG, l);
+
+ gpmc_mem_init();
}
projects / linux-2.6-omap-h63xx.git / blobdiff