ARM: OMAP2420: hwmod data: Add MMC hwmod data for 2420

Add MMC for 2420 so we can pass the DMA request lines the same
way as we already do on omap2430 and later.

Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
[paul@pwsan.com: updated to apply on top of the 3.5 hwmod cleanup;
 changed mmc hwmod name/class to "msdi" as documented in the 2420 TRM Rev X;
 added sysconfig register information; added 16 bit register width flag;
 added MSDI custom reset code]
Signed-off-by: Paul Walmsley <paul@pwsan.com>

4 files changed, 159 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index d8604a3e490e..4eee0f139cbd 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -189,6 +189,9 @@ ifneq ($(CONFIG_TIDSPBRIDGE),)
 obj-y                                   += dsp.o
 endif
 
+# OMAP2420 MSDI controller integration support ("MMC")
+obj-$(CONFIG_SOC_OMAP2420)              += msdi.o
+
 # Specific board support
 obj-$(CONFIG_MACH_OMAP_GENERIC)         += board-generic.o
 obj-$(CONFIG_MACH_OMAP_H4)              += board-h4.o
diff --git a/arch/arm/mach-omap2/msdi.c b/arch/arm/mach-omap2/msdi.c
new file mode 100644
index 000000000000..ef2a6924731a
--- /dev/null
+++ b/arch/arm/mach-omap2/msdi.c
@@ -0,0 +1,88 @@
+/*
+ * MSDI IP block reset
+ *
+ * Copyright (C) 2012 Texas Instruments, Inc.
+ * Paul Walmsley
+ *
+ * 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.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ * XXX What about pad muxing?
+ */
+
+#include <linux/kernel.h>
+
+#include <plat/omap_hwmod.h>
+#include <plat/mmc.h>
+
+#include "common.h"
+
+/*
+ * MSDI_CON_OFFSET: offset in bytes of the MSDI IP block's CON register
+ *     from the IP block's base address
+ */
+#define MSDI_CON_OFFSET                         0x0c
+
+/* Register bitfields in the CON register */
+#define MSDI_CON_POW_MASK                       BIT(11)
+#define MSDI_CON_CLKD_MASK                      (0x3f << 0)
+#define MSDI_CON_CLKD_SHIFT                     0
+
+/* Maximum microseconds to wait for OMAP module to softreset */
+#define MAX_MODULE_SOFTRESET_WAIT       10000
+
+/* MSDI_TARGET_RESET_CLKD: clock divisor to use throughout the reset */
+#define MSDI_TARGET_RESET_CLKD          0x3ff
+
+/**
+ * omap_msdi_reset - reset the MSDI IP block
+ * @oh: struct omap_hwmod *
+ *
+ * The MSDI IP block on OMAP2420 has to have both the POW and CLKD
+ * fields set inside its CON register for a reset to complete
+ * successfully.  This is not documented in the TRM.  For CLKD, we use
+ * the value that results in the lowest possible clock rate, to attempt
+ * to avoid disturbing any cards.
+ */
+int omap_msdi_reset(struct omap_hwmod *oh)
+{
+        u16 v = 0;
+        int c = 0;
+
+        /* Write to the SOFTRESET bit */
+        omap_hwmod_softreset(oh);
+
+        /* Enable the MSDI core and internal clock */
+        v |= MSDI_CON_POW_MASK;
+        v |= MSDI_TARGET_RESET_CLKD << MSDI_CON_CLKD_SHIFT;
+        omap_hwmod_write(v, oh, MSDI_CON_OFFSET);
+
+        /* Poll on RESETDONE bit */
+        omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs)
+                           & SYSS_RESETDONE_MASK),
+                          MAX_MODULE_SOFTRESET_WAIT, c);
+
+        if (c == MAX_MODULE_SOFTRESET_WAIT)
+                pr_warning("%s: %s: softreset failed (waited %d usec)\n",
+                           __func__, oh->name, MAX_MODULE_SOFTRESET_WAIT);
+        else
+                pr_debug("%s: %s: softreset in %d usec\n", __func__,
+                         oh->name, c);
+
+        /* Disable the MSDI internal clock */
+        v &= ~MSDI_CON_CLKD_MASK;
+        omap_hwmod_write(v, oh, MSDI_CON_OFFSET);
+
+        return 0;
+}
diff --git a/arch/arm/mach-omap2/omap_hwmod_2420_data.c b/arch/arm/mach-omap2/omap_hwmod_2420_data.c
index 2c087ffc6a92..0c08d3f11f69 100644
--- a/arch/arm/mach-omap2/omap_hwmod_2420_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_2420_data.c
@@ -23,6 +23,7 @@
 #include <plat/dmtimer.h>
 #include <plat/l3_2xxx.h>
 #include <plat/l4_2xxx.h>
+#include <plat/mmc.h>
 
 #include "omap_hwmod_common_data.h"
 
@@ -239,6 +240,50 @@ static struct omap_hwmod omap2420_mcbsp2_hwmod = {
         },
 };
 
+static struct omap_hwmod_class_sysconfig omap2420_msdi_sysc = {
+        .rev_offs       = 0x3c,
+        .sysc_offs      = 0x64,
+        .syss_offs      = 0x68,
+        .sysc_flags     = (SYSC_HAS_SOFTRESET | SYSS_HAS_RESET_STATUS),
+        .sysc_fields    = &omap_hwmod_sysc_type1,
+};
+
+static struct omap_hwmod_class omap2420_msdi_hwmod_class = {
+        .name   = "msdi",
+        .sysc   = &omap2420_msdi_sysc,
+        .reset  = &omap_msdi_reset,
+};
+
+/* msdi1 */
+static struct omap_hwmod_irq_info omap2420_msdi1_irqs[] = {
+        { .irq = 83 },
+        { .irq = -1 }
+};
+
+static struct omap_hwmod_dma_info omap2420_msdi1_sdma_reqs[] = {
+        { .name = "tx", .dma_req = 61 }, /* OMAP24XX_DMA_MMC1_TX */
+        { .name = "rx", .dma_req = 62 }, /* OMAP24XX_DMA_MMC1_RX */
+        { .dma_req = -1 }
+};
+
+static struct omap_hwmod omap2420_msdi1_hwmod = {
+        .name           = "msdi1",
+        .class          = &omap2420_msdi_hwmod_class,
+        .mpu_irqs       = omap2420_msdi1_irqs,
+        .sdma_reqs      = omap2420_msdi1_sdma_reqs,
+        .main_clk       = "mmc_fck",
+        .prcm           = {
+                .omap2 = {
+                        .prcm_reg_id = 1,
+                        .module_bit = OMAP2420_EN_MMC_SHIFT,
+                        .module_offs = CORE_MOD,
+                        .idlest_reg_id = 1,
+                        .idlest_idle_bit = OMAP2420_ST_MMC_SHIFT,
+                },
+        },
+        .flags          = HWMOD_16BIT_REG,
+};
+
 /*
  * interfaces
  */
@@ -428,6 +473,24 @@ static struct omap_hwmod_ocp_if omap2420_l4_core__mcbsp2 = {
         .user           = OCP_USER_MPU | OCP_USER_SDMA,
 };
 
+static struct omap_hwmod_addr_space omap2420_msdi1_addrs[] = {
+        {
+                .pa_start       = 0x4809c000,
+                .pa_end         = 0x4809c000 + SZ_128 - 1,
+                .flags          = ADDR_TYPE_RT,
+        },
+        { }
+};
+
+/* l4_core -> msdi1 */
+static struct omap_hwmod_ocp_if omap2420_l4_core__msdi1 = {
+        .master         = &omap2xxx_l4_core_hwmod,
+        .slave          = &omap2420_msdi1_hwmod,
+        .clk            = "mmc_ick",
+        .addr           = omap2420_msdi1_addrs,
+        .user           = OCP_USER_MPU | OCP_USER_SDMA,
+};
+
 static struct omap_hwmod_ocp_if *omap2420_hwmod_ocp_ifs[] __initdata = {
         &omap2xxx_l3_main__l4_core,
         &omap2xxx_mpu__l3_main,
@@ -468,6 +531,7 @@ static struct omap_hwmod_ocp_if *omap2420_hwmod_ocp_ifs[] __initdata = {
         &omap2420_l4_core__mailbox,
         &omap2420_l4_core__mcbsp1,
         &omap2420_l4_core__mcbsp2,
+        &omap2420_l4_core__msdi1,
         NULL,
 };
 
diff --git a/arch/arm/plat-omap/include/plat/mmc.h b/arch/arm/plat-omap/include/plat/mmc.h
index 7a38750c0079..3e7ae0f0215f 100644
--- a/arch/arm/plat-omap/include/plat/mmc.h
+++ b/arch/arm/plat-omap/include/plat/mmc.h
@@ -16,6 +16,7 @@
 #include <linux/mmc/host.h>
 
 #include <plat/board.h>
+#include <plat/omap_hwmod.h>
 
 #define OMAP15XX_NR_MMC         1
 #define OMAP16XX_NR_MMC         2
@@ -195,4 +196,7 @@ static inline int omap_mmc_add(const char *name, int id, unsigned long base,
 }
 
 #endif
+
+extern int omap_msdi_reset(struct omap_hwmod *oh);
+
 #endif