[PATCH] adding gpmc configuration functions, west bridge related

From: Sutharsan R
Date: Mon Dec 20 2010 - 21:42:17 EST

This patch adds and exports gpmc configuration functions.
'gpmc' configuration functions will be used by
westbridge device controller driver in staging tree.
This patch is part of the work to get westbridge device controller driver
out of staging tree.

Signed-off-by: Sutharsan Ramamoorthy <srmt@xxxxxxxxxxx>

---

diff -uprN -X linux-2.6.37_vanilla/Documentation/dontdiff
linux-2.6.37_vanilla/arch/arm/mach-omap2/Makefile
linux-2.6.37-cywb/arch/arm/mach-omap2/Makefile
--- linux-2.6.37_vanilla/arch/arm/mach-omap2/Makefile 2010-11-29
20:42:04.000000000 -0800
+++ linux-2.6.37-cywb/arch/arm/mach-omap2/Makefile 2010-12-13
16:04:08.378446603 -0800
@@ -182,6 +182,7 @@ obj-y += $(usbfs-m) $(usbfs-y)
obj-y += usb-musb.o
obj-$(CONFIG_MACH_OMAP2_TUSB6010) += usb-tusb6010.o
obj-y += usb-ehci.o
+obj-$(CONFIG_WESTBRIDGE_ASTORIA) += usb-cywb-pnand.o

onenand-$(CONFIG_MTD_ONENAND_OMAP2) := gpmc-onenand.o
obj-y += $(onenand-m) $(onenand-y)
diff -uprN -X linux-2.6.37_vanilla/Documentation/dontdiff
linux-2.6.37_vanilla/arch/arm/mach-omap2/usb-cywb-pnand.c
linux-2.6.37-cywb/arch/arm/mach-omap2/usb-cywb-pnand.c
--- linux-2.6.37_vanilla/arch/arm/mach-omap2/usb-cywb-pnand.c 1969-12-31
16:00:00.000000000 -0800
+++ linux-2.6.37-cywb/arch/arm/mach-omap2/usb-cywb-pnand.c 2010-12-20
17:33:23.822251855 -0800
@@ -0,0 +1,170 @@
+/*
+ * linux /arch/arm/mach-omap2/usb-cywb-pnand.c
+ *
+ * Copyright (C) 2010 Cypress Semiconductor
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+
+#include <plat/gpmc.h>
+
+/*
+ * chip select number on GPMC ( 0..7 )
+ */
+#define AST_GPMC_CS 4
+
+/*
+ * for use by gpmc_set_timings api, measured in ns, not clocks
+ */
+#define WB_GPMC_BUSCYC_t (7 * 6)
+#define WB_GPMC_CS_t_o_n (0)
+#define WB_GPMC_ADV_t_o_n (0)
+#define WB_GPMC_OE_t_o_n (0)
+#define WB_GPMC_OE_t_o_f_f (5 * 6)
+#define WB_GPMC_WE_t_o_n (1 * 6)
+#define WB_GPMC_WE_t_o_f_f (5 * 6)
+#define WB_GPMC_RDS_ADJ (2 * 6)
+#define WB_GPMC_RD_t_a_c_c (WB_GPMC_OE_t_o_f_f + WB_GPMC_RDS_ADJ)
+#define WB_GPMC_WR_t_a_c_c (WB_GPMC_BUSCYC_t)
+
+#define GPMC_16BIT_MODE 0
+#define GPMC_RETIME 1
+
+/*
+ * GPMC_CONFIG7[cs] register bit fields
+ * AS_CS_MASK - 3 bit mask for A26,A25,A24,
+ * AS_CS_BADDR - 6 BIT VALUE A29 ...A24
+ * CSVALID_B - CSVALID bit on GPMC_CONFIG7[cs] register
+ */
+#define AS_CS_MASK (0X7 << 8)
+#define AS_CS_BADDR 0x02
+#define CSVALID_B (1 << 6)
+
+#define BLKSZ_4K 0x1000
+
+/*
+ * switch GPMC DATA bus mode
+ */
+void cywb_gpmc_enable_16bit_bus(bool dbus16_enabled)
+{
+ u32 tmp32;
+
+ /*
+ * disable gpmc CS4 operation 1st
+ */
+ tmp32 = gpmc_cs_read_reg(AST_GPMC_CS,
+ GPMC_CS_CONFIG7) & ~GPMC_CONFIG7_CSVALID;
+ gpmc_cs_write_reg(AST_GPMC_CS, GPMC_CS_CONFIG7, tmp32);
+
+ /*
+ * GPMC NAND data bus can be 8 or 16 bit wide
+ */
+ if (dbus16_enabled) {
+ dev_dbg(KERN_INFO "gpmc: enabling 16 bit bus\n");
+ gpmc_cs_write_reg(AST_GPMC_CS, GPMC_CS_CONFIG1,
+ (GPMC_CONFIG1_DEVICETYPE(2) |
+ GPMC_CONFIG1_WAIT_PIN_SEL(2) |
+ GPMC_CONFIG1_DEVICESIZE_16));
+ } else {
+ dev_dbg(KERN_INFO "gpmc: enabling 8 bit bus\n");
+ gpmc_cs_write_reg(AST_GPMC_CS, GPMC_CS_CONFIG1,
+ (GPMC_CONFIG1_DEVICETYPE(2) |
+ GPMC_CONFIG1_WAIT_PIN_SEL(2)));
+ }
+
+ /*
+ * re-enable astoria CS operation on GPMC
+ */
+ gpmc_cs_write_reg(AST_GPMC_CS, GPMC_CS_CONFIG7,
+ (tmp32 | GPMC_CONFIG7_CSVALID));
+}
+
+int cywb_pnand_platform_retime(int action, bool dbus16_enabled)
+{
+ u32 tmp32;
+ struct gpmc_timings timings;
+ int retval;
+
+ switch (action) {
+
+ case GPMC_16BIT_MODE:
+ cywb_gpmc_enable_16bit_bus(dbus16_enabled);
+ retval = 0;
+ break;
+ case GPMC_RETIME:
+ gpmc_cs_write_reg(AST_GPMC_CS, GPMC_CS_CONFIG1,
+ (GPMC_CONFIG1_DEVICETYPE(2) |
+ GPMC_CONFIG1_WAIT_PIN_SEL(2)));
+
+ memset(&timings, 0, sizeof(timings));
+
+ /* cs timing */
+ timings.cs_on = WB_GPMC_CS_t_o_n;
+ timings.cs_wr_off = WB_GPMC_BUSCYC_t;
+ timings.cs_rd_off = WB_GPMC_BUSCYC_t;
+
+ /* adv timing */
+ timings.adv_on = WB_GPMC_ADV_t_o_n;
+ timings.adv_rd_off = WB_GPMC_BUSCYC_t;
+ timings.adv_wr_off = WB_GPMC_BUSCYC_t;
+
+ /* oe timing */
+ timings.oe_on = WB_GPMC_OE_t_o_n;
+ timings.oe_off = WB_GPMC_OE_t_o_f_f;
+ timings.access = WB_GPMC_RD_t_a_c_c;
+ timings.rd_cycle = WB_GPMC_BUSCYC_t;
+
+ /* we timing */
+ timings.we_on = WB_GPMC_WE_t_o_n;
+ timings.we_off = WB_GPMC_WE_t_o_f_f;
+ timings.wr_access = WB_GPMC_WR_t_a_c_c;
+ timings.wr_cycle = WB_GPMC_BUSCYC_t;
+
+ timings.page_burst_access = WB_GPMC_BUSCYC_t;
+ timings.wr_data_mux_bus = WB_GPMC_BUSCYC_t;
+ gpmc_cs_set_timings(AST_GPMC_CS, &timings);
+
+ /*
+ * DISABLE cs4, NOTE GPMC REG7 is already configured
+ * at this point by gpmc_cs_request
+ */
+ tmp32 = gpmc_cs_read_reg(AST_GPMC_CS, GPMC_CS_CONFIG7) &
+ ~GPMC_CONFIG7_CSVALID;
+ gpmc_cs_write_reg(AST_GPMC_CS, GPMC_CS_CONFIG7, tmp32);
+
+ /*
+ * PROGRAM chip select Region, (see OMAP3430 TRM PAGE 1088)
+ */
+ gpmc_cs_write_reg(AST_GPMC_CS, GPMC_CS_CONFIG7,
+ (AS_CS_MASK | AS_CS_BADDR));
+
+ /*
+ * by default configure GPMC into 8 bit mode
+ * (to match astoria default mode)
+ */
+ gpmc_cs_write_reg(AST_GPMC_CS, GPMC_CS_CONFIG1,
+ (GPMC_CONFIG1_DEVICETYPE(2) |
+ GPMC_CONFIG1_WAIT_PIN_SEL(2)));
+
+ /*
+ * ENABLE astoria cs operation on GPMC
+ */
+ gpmc_cs_write_reg(AST_GPMC_CS, GPMC_CS_CONFIG7,
+ (tmp32 | GPMC_CONFIG7_CSVALID));
+ retval = 0;
+ break;
+ default:
+ retval = -EINVAL;
+ break;
+ }
+
+ return retval;
+
+}
+EXPORT_SYMBOL(cywb_pnand_platform_retime);
+
--
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