mfd: rts5249: Add support for RTS5250S power saving

Enable power saving for RTS5250S as following steps:
1.Set 0xFE58 to enable clock power management.
2.Check cfg space whether support L1SS or not.
3.If support L1SS, set 0xFF03 to free clkreq.
4.When entering idle status, enable aspm
  and set parameters for L1SS and LTR.
5.Wnen entering run status, disable aspm
  and set parameters for L1SS and LTR.
If entering L1SS mode successfully,
electric current will be below 2mA.

Signed-off-by: Rui Feng <rui_feng@realsil.com.cn>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 84 insertions, 0 deletions

diff --git a/include/linux/mfd/rtsx_pci.h b/include/linux/mfd/rtsx_pci.h
index 116816f..57e23ad 100644
--- a/include/linux/mfd/rtsx_pci.h
+++ b/include/linux/mfd/rtsx_pci.h
@@ -573,6 +573,12 @@
 #define MSGTXDATA3			0xFE47
 #define MSGTXCTL			0xFE48
 #define LTR_CTL				0xFE4A
+#define LTR_TX_EN_MASK		BIT(7)
+#define LTR_TX_EN_1			BIT(7)
+#define LTR_TX_EN_0			0
+#define LTR_LATENCY_MODE_MASK		BIT(6)
+#define LTR_LATENCY_MODE_HW		0
+#define LTR_LATENCY_MODE_SW		BIT(6)
 #define OBFF_CFG			0xFE4C
 
 #define CDRESUMECTL			0xFE52
@@ -616,11 +622,15 @@
 #define L1SUB_CONFIG2			0xFE8E
 #define   L1SUB_AUTO_CFG		0x02
 #define L1SUB_CONFIG3			0xFE8F
+#define   L1OFF_MBIAS2_EN_5250		BIT(7)
 
 #define DUMMY_REG_RESET_0		0xFE90
 
 #define AUTOLOAD_CFG_BASE		0xFF00
 #define PETXCFG				0xFF03
+#define FORCE_CLKREQ_DELINK_MASK	BIT(7)
+#define FORCE_CLKREQ_LOW	0x80
+#define FORCE_CLKREQ_HIGH	0x00
 
 #define PM_CTRL1			0xFF44
 #define   CD_RESUME_EN_MASK		0xF0
@@ -844,6 +854,9 @@
 #define   PHY_DIG1E_RX_EN_KEEP		0x0001
 #define PHY_DUM_REG			0x1F
 
+#define PCR_ASPM_SETTING_REG1		0x160
+#define PCR_ASPM_SETTING_REG2		0x168
+
 #define PCR_SETTING_REG1		0x724
 #define PCR_SETTING_REG2		0x814
 #define PCR_SETTING_REG3		0x747
@@ -876,14 +889,79 @@ struct pcr_ops {
 	int		(*conv_clk_and_div_n)(int clk, int dir);
 	void		(*fetch_vendor_settings)(struct rtsx_pcr *pcr);
 	void		(*force_power_down)(struct rtsx_pcr *pcr, u8 pm_state);
+
+	void (*set_aspm)(struct rtsx_pcr *pcr, bool enable);
+	int (*set_ltr_latency)(struct rtsx_pcr *pcr, u32 latency);
+	int (*set_l1off_sub)(struct rtsx_pcr *pcr, u8 val);
+	void (*set_l1off_cfg_sub_d0)(struct rtsx_pcr *pcr, int active);
+	void (*full_on)(struct rtsx_pcr *pcr);
+	void (*power_saving)(struct rtsx_pcr *pcr);
 };
 
 enum PDEV_STAT  {PDEV_STAT_IDLE, PDEV_STAT_RUN};
 
+#define ASPM_L1_1_EN_MASK		BIT(3)
+#define ASPM_L1_2_EN_MASK		BIT(2)
+#define PM_L1_1_EN_MASK		BIT(1)
+#define PM_L1_2_EN_MASK		BIT(0)
+
+#define ASPM_L1_1_EN			BIT(0)
+#define ASPM_L1_2_EN			BIT(1)
+#define PM_L1_1_EN				BIT(2)
+#define PM_L1_2_EN				BIT(3)
+#define LTR_L1SS_PWR_GATE_EN	BIT(4)
+#define L1_SNOOZE_TEST_EN		BIT(5)
+#define LTR_L1SS_PWR_GATE_CHECK_CARD_EN	BIT(6)
+
+enum dev_aspm_mode {
+	DEV_ASPM_DISABLE = 0,
+	DEV_ASPM_DYNAMIC,
+	DEV_ASPM_BACKDOOR,
+	DEV_ASPM_STATIC,
+};
+
+/*
+ * struct rtsx_cr_option  - card reader option
+ * @dev_flags: device flags
+ * @force_clkreq_0: force clock request
+ * @ltr_en: enable ltr mode flag
+ * @ltr_enabled: ltr mode in configure space flag
+ * @ltr_active: ltr mode status
+ * @ltr_active_latency: ltr mode active latency
+ * @ltr_idle_latency: ltr mode idle latency
+ * @ltr_l1off_latency: ltr mode l1off latency
+ * @dev_aspm_mode: device aspm mode
+ * @l1_snooze_delay: l1 snooze delay
+ * @ltr_l1off_sspwrgate: ltr l1off sspwrgate
+ * @ltr_l1off_snooze_sspwrgate: ltr l1off snooze sspwrgate
+ */
+struct rtsx_cr_option {
+	u32 dev_flags;
+	bool force_clkreq_0;
+	bool ltr_en;
+	bool ltr_enabled;
+	bool ltr_active;
+	u32 ltr_active_latency;
+	u32 ltr_idle_latency;
+	u32 ltr_l1off_latency;
+	enum dev_aspm_mode dev_aspm_mode;
+	u32 l1_snooze_delay;
+	u8 ltr_l1off_sspwrgate;
+	u8 ltr_l1off_snooze_sspwrgate;
+};
+
+#define rtsx_set_dev_flag(cr, flag) \
+	((cr)->option.dev_flags |= (flag))
+#define rtsx_clear_dev_flag(cr, flag) \
+	((cr)->option.dev_flags &= ~(flag))
+#define rtsx_check_dev_flag(cr, flag) \
+	((cr)->option.dev_flags & (flag))
+
 struct rtsx_pcr {
 	struct pci_dev			*pci;
 	unsigned int			id;
 	int				pcie_cap;
+	struct rtsx_cr_option	option;
 
 	/* pci resources */
 	unsigned long			addr;
@@ -940,6 +1018,7 @@ struct rtsx_pcr {
 	u8				card_drive_sel;
 #define ASPM_L1_EN			0x02
 	u8				aspm_en;
+	bool				aspm_enabled;
 
 #define PCR_MS_PMOS			(1 << 0)
 #define PCR_REVERSE_SOCKET		(1 << 1)
@@ -964,6 +1043,11 @@ struct rtsx_pcr {
 	u8				dma_error_count;
 };
 
+#define PID_524A	0x524A
+#define PID_5249		0x5249
+#define PID_5250		0x5250
+#define PID_525A	0x525A
+
 #define CHK_PCI_PID(pcr, pid)		((pcr)->pci->device == (pid))
 #define PCI_VID(pcr)			((pcr)->pci->vendor)
 #define PCI_PID(pcr)			((pcr)->pci->device)