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, 223 insertions, 0 deletions

diff --git a/drivers/mfd/rts5209.c b/drivers/mfd/rts5209.c
new file mode 100644
index 000000000000..283a4f148084
--- /dev/null
+++ b/drivers/mfd/rts5209.c
@@ -0,0 +1,223 @@
+/* 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/delay.h>
+#include <linux/mfd/rtsx_pci.h>
+
+#include "rtsx_pcr.h"
+
+static u8 rts5209_get_ic_version(struct rtsx_pcr *pcr)
+{
+        u8 val;
+
+        val = rtsx_pci_readb(pcr, 0x1C);
+        return val & 0x0F;
+}
+
+static void rts5209_init_vendor_cfg(struct rtsx_pcr *pcr)
+{
+        u32 val;
+
+        rtsx_pci_read_config_dword(pcr, 0x724, &val);
+        dev_dbg(&(pcr->pci->dev), "Cfg 0x724: 0x%x\n", val);
+
+        if (!(val & 0x80)) {
+                if (val & 0x08)
+                        pcr->ms_pmos = false;
+                else
+                        pcr->ms_pmos = true;
+        }
+}
+
+static int rts5209_extra_init_hw(struct rtsx_pcr *pcr)
+{
+        rtsx_pci_init_cmd(pcr);
+
+        /* Turn off LED */
+        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO, 0xFF, 0x03);
+        /* Configure GPIO as output */
+        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO_DIR, 0xFF, 0x03);
+
+        return rtsx_pci_send_cmd(pcr, 100);
+}
+
+static int rts5209_optimize_phy(struct rtsx_pcr *pcr)
+{
+        return rtsx_pci_write_phy_register(pcr, 0x00, 0xB966);
+}
+
+static int rts5209_turn_on_led(struct rtsx_pcr *pcr)
+{
+        return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x00);
+}
+
+static int rts5209_turn_off_led(struct rtsx_pcr *pcr)
+{
+        return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x01);
+}
+
+static int rts5209_enable_auto_blink(struct rtsx_pcr *pcr)
+{
+        return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0xFF, 0x0D);
+}
+
+static int rts5209_disable_auto_blink(struct rtsx_pcr *pcr)
+{
+        return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0x08, 0x00);
+}
+
+static int rts5209_card_power_on(struct rtsx_pcr *pcr, int card)
+{
+        int err;
+        u8 pwr_mask, partial_pwr_on, pwr_on;
+
+        pwr_mask = SD_POWER_MASK;
+        partial_pwr_on = SD_PARTIAL_POWER_ON;
+        pwr_on = SD_POWER_ON;
+
+        if (pcr->ms_pmos && (card == RTSX_MS_CARD)) {
+                pwr_mask = MS_POWER_MASK;
+                partial_pwr_on = MS_PARTIAL_POWER_ON;
+                pwr_on = MS_POWER_ON;
+        }
+
+        rtsx_pci_init_cmd(pcr);
+        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
+                        pwr_mask, partial_pwr_on);
+        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
+                        LDO3318_PWR_MASK, 0x04);
+        err = rtsx_pci_send_cmd(pcr, 100);
+        if (err < 0)
+                return err;
+
+        /* To avoid too large in-rush current */
+        udelay(150);
+
+        rtsx_pci_init_cmd(pcr);
+        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL, pwr_mask, pwr_on);
+        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
+                        LDO3318_PWR_MASK, 0x00);
+        err = rtsx_pci_send_cmd(pcr, 100);
+        if (err < 0)
+                return err;
+
+        return 0;
+}
+
+static int rts5209_card_power_off(struct rtsx_pcr *pcr, int card)
+{
+        u8 pwr_mask, pwr_off;
+
+        pwr_mask = SD_POWER_MASK;
+        pwr_off = SD_POWER_OFF;
+
+        if (pcr->ms_pmos && (card == RTSX_MS_CARD)) {
+                pwr_mask = MS_POWER_MASK;
+                pwr_off = MS_POWER_OFF;
+        }
+
+        rtsx_pci_init_cmd(pcr);
+        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
+                        pwr_mask | PMOS_STRG_MASK, pwr_off | PMOS_STRG_400mA);
+        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
+                        LDO3318_PWR_MASK, 0X06);
+        return rtsx_pci_send_cmd(pcr, 100);
+}
+
+static const struct pcr_ops rts5209_pcr_ops = {
+        .extra_init_hw = rts5209_extra_init_hw,
+        .optimize_phy = rts5209_optimize_phy,
+        .turn_on_led = rts5209_turn_on_led,
+        .turn_off_led = rts5209_turn_off_led,
+        .enable_auto_blink = rts5209_enable_auto_blink,
+        .disable_auto_blink = rts5209_disable_auto_blink,
+        .card_power_on = rts5209_card_power_on,
+        .card_power_off = rts5209_card_power_off,
+        .cd_deglitch = NULL,
+};
+
+/* 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 rts5209_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, 0xE9),
+        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 rts5209_sd_pull_ctl_disable_tbl[] = {
+        RTSX_REG_PAIR(CARD_PULL_CTL1, 0x55),
+        RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
+        RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
+        0,
+};
+
+/* MS Pull Control Enable:
+ *     MS CD       ==> pull up
+ *     others      ==> pull down
+ */
+static const u32 rts5209_ms_pull_ctl_enable_tbl[] = {
+        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
+        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
+        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
+        0,
+};
+
+/* MS Pull Control Disable:
+ *     MS CD       ==> pull up
+ *     others      ==> pull down
+ */
+static const u32 rts5209_ms_pull_ctl_disable_tbl[] = {
+        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
+        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
+        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
+        0,
+};
+
+void rts5209_init_params(struct rtsx_pcr *pcr)
+{
+        pcr->extra_caps = EXTRA_CAPS_SD_SDR50 |
+                EXTRA_CAPS_SD_SDR104 | EXTRA_CAPS_MMC_8BIT;
+        pcr->num_slots = 2;
+        pcr->ops = &rts5209_pcr_ops;
+
+        rts5209_init_vendor_cfg(pcr);
+
+        pcr->ic_version = rts5209_get_ic_version(pcr);
+        pcr->sd_pull_ctl_enable_tbl = rts5209_sd_pull_ctl_enable_tbl;
+        pcr->sd_pull_ctl_disable_tbl = rts5209_sd_pull_ctl_disable_tbl;
+        pcr->ms_pull_ctl_enable_tbl = rts5209_ms_pull_ctl_enable_tbl;
+        pcr->ms_pull_ctl_disable_tbl = rts5209_ms_pull_ctl_disable_tbl;
+}