Blackfin arch: Start untangling the CPLB handling code.

 - Move cache initialization to C from assembly.
 - Move anomaly workaround for writing [ID]MEM_CONTROL to assembly, so
   that we don't have to mess around with .align directives in C source.
 - Fix a bug where bfin_write_DMEM_CONTROL would write to IMEM_CONTROL
 - Break out CPLB related code from kernel/setup.c into their own file.
 - Don't define variables in header files, only declare them.

Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

1 files changed, 433 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/cplbinit.c b/arch/blackfin/kernel/cplbinit.c
new file mode 100644
index 00000000000..bbdb403fcb5
--- /dev/null
+++ b/arch/blackfin/kernel/cplbinit.c
@@ -0,0 +1,433 @@
+/*
+ * Blackfin CPLB initialization
+ *
+ *               Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <linux/module.h>
+
+#include <asm/blackfin.h>
+#include <asm/cplbinit.h>
+
+u_long icplb_table[MAX_CPLBS+1];
+u_long dcplb_table[MAX_CPLBS+1];
+
+#ifdef CONFIG_CPLB_SWITCH_TAB_L1
+u_long ipdt_table[MAX_SWITCH_I_CPLBS+1]__attribute__((l1_data));
+u_long dpdt_table[MAX_SWITCH_D_CPLBS+1]__attribute__((l1_data));
+
+#ifdef CONFIG_CPLB_INFO
+u_long ipdt_swapcount_table[MAX_SWITCH_I_CPLBS]__attribute__((l1_data));
+u_long dpdt_swapcount_table[MAX_SWITCH_D_CPLBS]__attribute__((l1_data));
+#endif /* CONFIG_CPLB_INFO */
+
+#else
+
+u_long ipdt_table[MAX_SWITCH_I_CPLBS+1];
+u_long dpdt_table[MAX_SWITCH_D_CPLBS+1];
+
+#ifdef CONFIG_CPLB_INFO
+u_long ipdt_swapcount_table[MAX_SWITCH_I_CPLBS];
+u_long dpdt_swapcount_table[MAX_SWITCH_D_CPLBS];
+#endif /* CONFIG_CPLB_INFO */
+
+#endif /*CONFIG_CPLB_SWITCH_TAB_L1*/
+
+struct s_cplb {
+	struct cplb_tab init_i;
+	struct cplb_tab init_d;
+	struct cplb_tab switch_i;
+	struct cplb_tab switch_d;
+};
+
+#if defined(CONFIG_BLKFIN_DCACHE) || defined(CONFIG_BLKFIN_CACHE)
+static struct cplb_desc cplb_data[] = {
+	{
+		.start = 0,
+		.end = SIZE_1K,
+		.psize = SIZE_1K,
+		.attr = INITIAL_T | SWITCH_T | I_CPLB | D_CPLB,
+		.i_conf = SDRAM_OOPS,
+		.d_conf = SDRAM_OOPS,
+#if defined(CONFIG_DEBUG_HUNT_FOR_ZERO)
+		.valid = 1,
+#else
+		.valid = 0,
+#endif
+		.name = "ZERO Pointer Saveguard",
+	},
+	{
+		.start = L1_CODE_START,
+		.end = L1_CODE_START + L1_CODE_LENGTH,
+		.psize = SIZE_4M,
+		.attr = INITIAL_T | SWITCH_T | I_CPLB,
+		.i_conf = L1_IMEMORY,
+		.d_conf = 0,
+		.valid = 1,
+		.name = "L1 I-Memory",
+	},
+	{
+		.start = L1_DATA_A_START,
+		.end = L1_DATA_B_START + L1_DATA_B_LENGTH,
+		.psize = SIZE_4M,
+		.attr = INITIAL_T | SWITCH_T | D_CPLB,
+		.i_conf = 0,
+		.d_conf = L1_DMEMORY,
+#if ((L1_DATA_A_LENGTH > 0) || (L1_DATA_B_LENGTH > 0))
+		.valid = 1,
+#else
+		.valid = 0,
+#endif
+		.name = "L1 D-Memory",
+	},
+	{
+		.start = 0,
+		.end = 0,  /* dynamic */
+		.psize = 0,
+		.attr = INITIAL_T | SWITCH_T | I_CPLB | D_CPLB,
+		.i_conf =  SDRAM_IGENERIC,
+		.d_conf =  SDRAM_DGENERIC,
+		.valid = 1,
+		.name = "SDRAM Kernel",
+	},
+	{
+		.start = 0, /* dynamic */
+		.end = 0, /* dynamic */
+		.psize = 0,
+		.attr = INITIAL_T | SWITCH_T | D_CPLB,
+		.i_conf =  SDRAM_IGENERIC,
+		.d_conf =  SDRAM_DNON_CHBL,
+		.valid = 1,
+		.name = "SDRAM RAM MTD",
+	},
+	{
+		.start = 0, /* dynamic */
+		.end = 0,   /* dynamic */
+		.psize = SIZE_1M,
+		.attr = INITIAL_T | SWITCH_T | D_CPLB,
+		.d_conf = SDRAM_DNON_CHBL,
+		.valid = 1,
+		.name = "SDRAM Uncached DMA ZONE",
+	},
+	{
+		.start = 0, /* dynamic */
+		.end = 0, /* dynamic */
+		.psize = 0,
+		.attr = SWITCH_T | D_CPLB,
+		.i_conf = 0, /* dynamic */
+		.d_conf = 0, /* dynamic */
+		.valid = 1,
+		.name = "SDRAM Reserved Memory",
+	},
+	{
+		.start = ASYNC_BANK0_BASE,
+		.end = ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE,
+		.psize = 0,
+		.attr = SWITCH_T | D_CPLB,
+		.d_conf = SDRAM_EBIU,
+		.valid = 1,
+		.name = "ASYNC Memory",
+	},
+	{
+#if defined(CONFIG_BF561)
+		.start = L2_SRAM,
+		.end = L2_SRAM_END,
+		.psize = SIZE_1M,
+		.attr = SWITCH_T | D_CPLB,
+		.i_conf = L2_MEMORY,
+		.d_conf = L2_MEMORY,
+		.valid = 1,
+#else
+		.valid = 0,
+#endif
+		.name = "L2 Memory",
+	}
+};
+
+static u16 __init lock_kernel_check(u32 start, u32 end)
+{
+	if ((start <= (u32) _stext && end >= (u32) _end)
+	    || (start >= (u32) _stext && end <= (u32) _end))
+		return IN_KERNEL;
+	return 0;
+}
+
+static unsigned short __init
+fill_cplbtab(struct cplb_tab *table,
+	     unsigned long start, unsigned long end,
+	     unsigned long block_size, unsigned long cplb_data)
+{
+	int i;
+
+	switch (block_size) {
+	case SIZE_4M:
+		i = 3;
+		break;
+	case SIZE_1M:
+		i = 2;
+		break;
+	case SIZE_4K:
+		i = 1;
+		break;
+	case SIZE_1K:
+	default:
+		i = 0;
+		break;
+	}
+
+	cplb_data = (cplb_data & ~(3 << 16)) | (i << 16);
+
+	while ((start < end) && (table->pos < table->size)) {
+
+		table->tab[table->pos++] = start;
+
+		if (lock_kernel_check(start, start + block_size) == IN_KERNEL)
+			table->tab[table->pos++] =
+			    cplb_data | CPLB_LOCK | CPLB_DIRTY;
+		else
+			table->tab[table->pos++] = cplb_data;
+
+		start += block_size;
+	}
+	return 0;
+}
+
+static unsigned short __init
+close_cplbtab(struct cplb_tab *table)
+{
+
+	while (table->pos < table->size) {
+
+		table->tab[table->pos++] = 0;
+		table->tab[table->pos++] = 0; /* !CPLB_VALID */
+	}
+	return 0;
+}
+
+/* helper function */
+static void __fill_code_cplbtab(struct cplb_tab *t, int i, u32 a_start, u32 a_end)
+{
+	if (cplb_data[i].psize) {
+		fill_cplbtab(t,
+				cplb_data[i].start,
+				cplb_data[i].end,
+				cplb_data[i].psize,
+				cplb_data[i].i_conf);
+	} else {
+#if (defined(CONFIG_BLKFIN_CACHE) && defined(ANOMALY_05000263))
+		if (i == SDRAM_KERN) {
+			fill_cplbtab(t,
+					cplb_data[i].start,
+					cplb_data[i].end,
+					SIZE_4M,
+					cplb_data[i].i_conf);
+		} else
+#endif
+		{
+			fill_cplbtab(t,
+					cplb_data[i].start,
+					a_start,
+					SIZE_1M,
+					cplb_data[i].i_conf);
+			fill_cplbtab(t,
+					a_start,
+					a_end,
+					SIZE_4M,
+					cplb_data[i].i_conf);
+			fill_cplbtab(t, a_end,
+					cplb_data[i].end,
+					SIZE_1M,
+					cplb_data[i].i_conf);
+		}
+	}
+}
+
+static void __fill_data_cplbtab(struct cplb_tab *t, int i, u32 a_start, u32 a_end)
+{
+	if (cplb_data[i].psize) {
+		fill_cplbtab(t,
+				cplb_data[i].start,
+				cplb_data[i].end,
+				cplb_data[i].psize,
+				cplb_data[i].d_conf);
+	} else {
+		fill_cplbtab(t,
+				cplb_data[i].start,
+				a_start, SIZE_1M,
+				cplb_data[i].d_conf);
+		fill_cplbtab(t, a_start,
+				a_end, SIZE_4M,
+				cplb_data[i].d_conf);
+		fill_cplbtab(t, a_end,
+				cplb_data[i].end,
+				SIZE_1M,
+				cplb_data[i].d_conf);
+	}
+}
+
+void __init generate_cpl_tables(void)
+{
+
+	u16 i, j, process;
+	u32 a_start, a_end, as, ae, as_1m;
+
+	struct cplb_tab *t_i = NULL;
+	struct cplb_tab *t_d = NULL;
+	struct s_cplb cplb;
+
+	cplb.init_i.size = MAX_CPLBS;
+	cplb.init_d.size = MAX_CPLBS;
+	cplb.switch_i.size = MAX_SWITCH_I_CPLBS;
+	cplb.switch_d.size = MAX_SWITCH_D_CPLBS;
+
+	cplb.init_i.pos = 0;
+	cplb.init_d.pos = 0;
+	cplb.switch_i.pos = 0;
+	cplb.switch_d.pos = 0;
+
+	cplb.init_i.tab = icplb_table;
+	cplb.init_d.tab = dcplb_table;
+	cplb.switch_i.tab = ipdt_table;
+	cplb.switch_d.tab = dpdt_table;
+
+	cplb_data[SDRAM_KERN].end = memory_end;
+
+#ifdef CONFIG_MTD_UCLINUX
+	cplb_data[SDRAM_RAM_MTD].start = memory_mtd_start;
+	cplb_data[SDRAM_RAM_MTD].end = memory_mtd_start + mtd_size;
+	cplb_data[SDRAM_RAM_MTD].valid = mtd_size > 0;
+# if defined(CONFIG_ROMFS_FS)
+	cplb_data[SDRAM_RAM_MTD].attr |= I_CPLB;
+
+	/*
+	 * The ROMFS_FS size is often not multiple of 1MB.
+	 * This can cause multiple CPLB sets covering the same memory area.
+	 * This will then cause multiple CPLB hit exceptions.
+	 * Workaround: We ensure a contiguous memory area by extending the kernel
+	 * memory section over the mtd section.
+	 * For ROMFS_FS memory must be covered with ICPLBs anyways.
+	 * So there is no difference between kernel and mtd memory setup.
+	 */
+
+	cplb_data[SDRAM_KERN].end = memory_mtd_start + mtd_size;;
+	cplb_data[SDRAM_RAM_MTD].valid = 0;
+
+# endif
+#else
+	cplb_data[SDRAM_RAM_MTD].valid = 0;
+#endif
+
+	cplb_data[SDRAM_DMAZ].start = _ramend - DMA_UNCACHED_REGION;
+	cplb_data[SDRAM_DMAZ].end = _ramend;
+
+	cplb_data[RES_MEM].start = _ramend;
+	cplb_data[RES_MEM].end = physical_mem_end;
+
+	if (reserved_mem_dcache_on)
+		cplb_data[RES_MEM].d_conf = SDRAM_DGENERIC;
+	else
+		cplb_data[RES_MEM].d_conf = SDRAM_DNON_CHBL;
+
+	if (reserved_mem_icache_on)
+		cplb_data[RES_MEM].i_conf = SDRAM_IGENERIC;
+	else
+		cplb_data[RES_MEM].i_conf = SDRAM_INON_CHBL;
+
+	for (i = ZERO_P; i <= L2_MEM; i++) {
+		if (!cplb_data[i].valid)
+			continue;
+
+		as_1m = cplb_data[i].start % SIZE_1M;
+
+		/* We need to make sure all sections are properly 1M aligned
+		 * However between Kernel Memory and the Kernel mtd section, depending on the
+		 * rootfs size, there can be overlapping memory areas.
+		 */
+
+		if (as_1m && i != L1I_MEM && i != L1D_MEM) {
+#ifdef CONFIG_MTD_UCLINUX
+			if (i == SDRAM_RAM_MTD) {
+				if ((cplb_data[SDRAM_KERN].end + 1) > cplb_data[SDRAM_RAM_MTD].start)
+					cplb_data[SDRAM_RAM_MTD].start = (cplb_data[i].start & (-2*SIZE_1M)) + SIZE_1M;
+				else
+					cplb_data[SDRAM_RAM_MTD].start = (cplb_data[i].start & (-2*SIZE_1M));
+			} else
+#endif
+				printk(KERN_WARNING "Unaligned Start of %s at 0x%X\n",
+				       cplb_data[i].name, cplb_data[i].start);
+		}
+
+		as = cplb_data[i].start % SIZE_4M;
+		ae = cplb_data[i].end % SIZE_4M;
+
+		if (as)
+			a_start = cplb_data[i].start + (SIZE_4M - (as));
+		else
+			a_start = cplb_data[i].start;
+
+		a_end = cplb_data[i].end - ae;
+
+		for (j = INITIAL_T; j <= SWITCH_T; j++) {
+
+			switch (j) {
+			case INITIAL_T:
+				if (cplb_data[i].attr & INITIAL_T) {
+					t_i = &cplb.init_i;
+					t_d = &cplb.init_d;
+					process = 1;
+				} else
+					process = 0;
+				break;
+			case SWITCH_T:
+				if (cplb_data[i].attr & SWITCH_T) {
+					t_i = &cplb.switch_i;
+					t_d = &cplb.switch_d;
+					process = 1;
+				} else
+					process = 0;
+				break;
+			default:
+					process = 0;
+				break;
+			}
+
+			if (!process)
+				continue;
+			if (cplb_data[i].attr & I_CPLB)
+				__fill_code_cplbtab(t_i, i, a_start, a_end);
+
+			if (cplb_data[i].attr & D_CPLB)
+				__fill_data_cplbtab(t_d, i, a_start, a_end);
+		}
+	}
+
+/* close tables */
+
+	close_cplbtab(&cplb.init_i);
+	close_cplbtab(&cplb.init_d);
+
+	cplb.init_i.tab[cplb.init_i.pos] = -1;
+	cplb.init_d.tab[cplb.init_d.pos] = -1;
+	cplb.switch_i.tab[cplb.switch_i.pos] = -1;
+	cplb.switch_d.tab[cplb.switch_d.pos] = -1;
+
+}
+
+#endif
+