drivers/mfd: Add realtek pcie card reader driver

Realtek PCI-E card reader driver adapts requests from upper-level
sdmmc/memstick layer to the real physical card reader.

Signed-off-by: Wei WANG <wei_wang@realsil.com.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 251 insertions, 0 deletions

diff --git a/drivers/mfd/rtl8411.c b/drivers/mfd/rtl8411.c
new file mode 100644
index 000000000000..89f046ca9e41
--- /dev/null
+++ b/drivers/mfd/rtl8411.c
@@ -0,0 +1,251 @@
+/* Driver for Realtek PCI-Express card reader
+ *
+ * Copyright(c) 2009 Realtek Semiconductor Corp. All rights reserved.
+ *
+ * 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, 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 <http://www.gnu.org/licenses/>.
+ *
+ * Author:
+ *   Wei WANG <wei_wang@realsil.com.cn>
+ *   No. 450, Shenhu Road, Suzhou Industry Park, Suzhou, China
+ */
+
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/mfd/rtsx_pci.h>
+
+#include "rtsx_pcr.h"
+
+static u8 rtl8411_get_ic_version(struct rtsx_pcr *pcr)
+{
+        u8 val;
+
+        rtsx_pci_read_register(pcr, SYS_VER, &val);
+        return val & 0x0F;
+}
+
+static int rtl8411_extra_init_hw(struct rtsx_pcr *pcr)
+{
+        return rtsx_pci_write_register(pcr, CD_PAD_CTL,
+                        CD_DISABLE_MASK | CD_AUTO_DISABLE, CD_ENABLE);
+}
+
+static int rtl8411_turn_on_led(struct rtsx_pcr *pcr)
+{
+        return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x00);
+}
+
+static int rtl8411_turn_off_led(struct rtsx_pcr *pcr)
+{
+        return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x01);
+}
+
+static int rtl8411_enable_auto_blink(struct rtsx_pcr *pcr)
+{
+        return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0xFF, 0x0D);
+}
+
+static int rtl8411_disable_auto_blink(struct rtsx_pcr *pcr)
+{
+        return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0x08, 0x00);
+}
+
+static int rtl8411_card_power_on(struct rtsx_pcr *pcr, int card)
+{
+        int err;
+
+        rtsx_pci_init_cmd(pcr);
+        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
+                        BPP_POWER_MASK, BPP_POWER_5_PERCENT_ON);
+        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_CTL,
+                        BPP_LDO_POWB, BPP_LDO_SUSPEND);
+        err = rtsx_pci_send_cmd(pcr, 100);
+        if (err < 0)
+                return err;
+
+        /* To avoid too large in-rush current */
+        udelay(150);
+
+        err = rtsx_pci_write_register(pcr, CARD_PWR_CTL,
+                        BPP_POWER_MASK, BPP_POWER_10_PERCENT_ON);
+        if (err < 0)
+                return err;
+
+        udelay(150);
+
+        err = rtsx_pci_write_register(pcr, CARD_PWR_CTL,
+                        BPP_POWER_MASK, BPP_POWER_15_PERCENT_ON);
+        if (err < 0)
+                return err;
+
+        udelay(150);
+
+        err = rtsx_pci_write_register(pcr, CARD_PWR_CTL,
+                        BPP_POWER_MASK, BPP_POWER_ON);
+        if (err < 0)
+                return err;
+
+        return rtsx_pci_write_register(pcr, LDO_CTL, BPP_LDO_POWB, BPP_LDO_ON);
+}
+
+static int rtl8411_card_power_off(struct rtsx_pcr *pcr, int card)
+{
+        int err;
+
+        err = rtsx_pci_write_register(pcr, CARD_PWR_CTL,
+                        BPP_POWER_MASK, BPP_POWER_OFF);
+        if (err < 0)
+                return err;
+
+        return rtsx_pci_write_register(pcr, LDO_CTL,
+                        BPP_LDO_POWB, BPP_LDO_SUSPEND);
+}
+
+static unsigned int rtl8411_cd_deglitch(struct rtsx_pcr *pcr)
+{
+        unsigned int card_exist;
+
+        card_exist = rtsx_pci_readl(pcr, RTSX_BIPR);
+        card_exist &= CARD_EXIST;
+        if (!card_exist) {
+                /* Enable card CD */
+                rtsx_pci_write_register(pcr, CD_PAD_CTL,
+                                CD_DISABLE_MASK, CD_ENABLE);
+                /* Enable card interrupt */
+                rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x00);
+                return 0;
+        }
+
+        if (hweight32(card_exist) > 1) {
+                rtsx_pci_write_register(pcr, CARD_PWR_CTL,
+                                BPP_POWER_MASK, BPP_POWER_5_PERCENT_ON);
+                msleep(100);
+
+                card_exist = rtsx_pci_readl(pcr, RTSX_BIPR);
+                if (card_exist & MS_EXIST)
+                        card_exist = MS_EXIST;
+                else if (card_exist & SD_EXIST)
+                        card_exist = SD_EXIST;
+                else
+                        card_exist = 0;
+
+                rtsx_pci_write_register(pcr, CARD_PWR_CTL,
+                                BPP_POWER_MASK, BPP_POWER_OFF);
+
+                dev_dbg(&(pcr->pci->dev),
+                                "After CD deglitch, card_exist = 0x%x\n",
+                                card_exist);
+        }
+
+        if (card_exist & MS_EXIST) {
+                /* Disable SD interrupt */
+                rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x40);
+                rtsx_pci_write_register(pcr, CD_PAD_CTL,
+                                CD_DISABLE_MASK, MS_CD_EN_ONLY);
+        } else if (card_exist & SD_EXIST) {
+                /* Disable MS interrupt */
+                rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x80);
+                rtsx_pci_write_register(pcr, CD_PAD_CTL,
+                                CD_DISABLE_MASK, SD_CD_EN_ONLY);
+        }
+
+        return card_exist;
+}
+
+static const struct pcr_ops rtl8411_pcr_ops = {
+        .extra_init_hw = rtl8411_extra_init_hw,
+        .optimize_phy = NULL,
+        .turn_on_led = rtl8411_turn_on_led,
+        .turn_off_led = rtl8411_turn_off_led,
+        .enable_auto_blink = rtl8411_enable_auto_blink,
+        .disable_auto_blink = rtl8411_disable_auto_blink,
+        .card_power_on = rtl8411_card_power_on,
+        .card_power_off = rtl8411_card_power_off,
+        .cd_deglitch = rtl8411_cd_deglitch,
+};
+
+/* SD Pull Control Enable:
+ *     SD_DAT[3:0] ==> pull up
+ *     SD_CD       ==> pull up
+ *     SD_WP       ==> pull up
+ *     SD_CMD      ==> pull up
+ *     SD_CLK      ==> pull down
+ */
+static const u32 rtl8411_sd_pull_ctl_enable_tbl[] = {
+        RTSX_REG_PAIR(CARD_PULL_CTL1, 0xAA),
+        RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
+        RTSX_REG_PAIR(CARD_PULL_CTL3, 0xA9),
+        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
+        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x09),
+        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
+        0,
+};
+
+/* SD Pull Control Disable:
+ *     SD_DAT[3:0] ==> pull down
+ *     SD_CD       ==> pull up
+ *     SD_WP       ==> pull down
+ *     SD_CMD      ==> pull down
+ *     SD_CLK      ==> pull down
+ */
+static const u32 rtl8411_sd_pull_ctl_disable_tbl[] = {
+        RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
+        RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
+        RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
+        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
+        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
+        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
+        0,
+};
+
+/* MS Pull Control Enable:
+ *     MS CD       ==> pull up
+ *     others      ==> pull down
+ */
+static const u32 rtl8411_ms_pull_ctl_enable_tbl[] = {
+        RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
+        RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
+        RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
+        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x05),
+        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
+        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
+        0,
+};
+
+/* MS Pull Control Disable:
+ *     MS CD       ==> pull up
+ *     others      ==> pull down
+ */
+static const u32 rtl8411_ms_pull_ctl_disable_tbl[] = {
+        RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
+        RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
+        RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
+        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
+        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
+        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
+        0,
+};
+
+void rtl8411_init_params(struct rtsx_pcr *pcr)
+{
+        pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
+        pcr->num_slots = 2;
+        pcr->ops = &rtl8411_pcr_ops;
+
+        pcr->ic_version = rtl8411_get_ic_version(pcr);
+        pcr->sd_pull_ctl_enable_tbl = rtl8411_sd_pull_ctl_enable_tbl;
+        pcr->sd_pull_ctl_disable_tbl = rtl8411_sd_pull_ctl_disable_tbl;
+        pcr->ms_pull_ctl_enable_tbl = rtl8411_ms_pull_ctl_enable_tbl;
+        pcr->ms_pull_ctl_disable_tbl = rtl8411_ms_pull_ctl_disable_tbl;
+}