Re: [PATCH v6 2/4] ARM: pxa168: Add SDHCI support

Tanmay Upadhyay <tanmay.upadhyay@xxxxxxxxxxxxxx> · Sun, 17 Mar 2013 23:06:46 -0500

On 3/17/13 8:13 PM, Haojian Zhuang wrote:
On Mon, Mar 18, 2013 at 2:18 AM, Tanmay Upadhyay
<tanmay.upadhyay@xxxxxxxxxxxxxx> wrote:
v2 - clock register for SDHCI are not common across all MMP SoCs.
      So, move PXA168 implementation to pxa168.c

v3 - sdhci-pxav1 driver code is merged with sdhci-pxav2. So, change
      the device name accordingly
    - start sdhci device numbering from 1 as other PXA168 devices
      does that

v4 - Use different names for SD clock registers for PXA168 instead
      of redefining them in pxa168.c. Suggested by Haojian Zhuang

v5 - Have two different clock enable functions for clock block 1 & 2
      & don't change indentation in regs-apmu.h as suggested by Haojian
      Zhuang
    - Use device name while adding clock as suggested by Russell King

v6 - Rebase for Linux v3.8; de-select COMMON_CLK for PXA168 as its
      SDHCI clocks should be handled differently than others
---
  arch/arm/mach-mmp/Kconfig               |    1 -
  arch/arm/mach-mmp/clock-pxa168.c        |   47 +++++++++++++++++++++++++++++++
  arch/arm/mach-mmp/include/mach/pxa168.h |   20 +++++++++++++
  arch/arm/mach-mmp/pxa168.c              |    4 +++
  4 files changed, 71 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-mmp/Kconfig b/arch/arm/mach-mmp/Kconfig
index ebdda83..530245c 100644
--- a/arch/arm/mach-mmp/Kconfig
+++ b/arch/arm/mach-mmp/Kconfig
@@ -111,7 +111,6 @@ endmenu

  config CPU_PXA168
         bool
-       select COMMON_CLK
         select CPU_MOHAWK
         help
           Select code specific to PXA168
diff --git a/arch/arm/mach-mmp/clock-pxa168.c b/arch/arm/mach-mmp/clock-pxa168.c
index 5e6c18c..65ea00e 100644
--- a/arch/arm/mach-mmp/clock-pxa168.c
+++ b/arch/arm/mach-mmp/clock-pxa168.c
@@ -31,11 +31,49 @@
  #define APBC_SSP4      APBC_REG(0x858)
  #define APBC_SSP5      APBC_REG(0x85c)

+#define APMU_SDH0      APMU_REG(0x054)
+#define APMU_SDH1      APMU_REG(0x058)
  #define APMU_NAND      APMU_REG(0x060)
  #define APMU_LCD       APMU_REG(0x04c)
+#define APMU_SDH2      APMU_REG(0x0e0)
+#define APMU_SDH3      APMU_REG(0x0e4)
  #define APMU_ETH       APMU_REG(0x0fc)
  #define APMU_USB       APMU_REG(0x05c)

+static void sdh1_clk_enable(struct clk *clk)
+{
+       /* Bits 3 & 0 in registers for host 0 should be set for host 1 also */
+       __raw_writel(__raw_readl(APMU_SDH0) | 0x9, APMU_SDH0);
+
+       __raw_writel(__raw_readl(clk->clk_rst) | clk->enable_val, clk->clk_rst);
+}
+
+static void sdh2_clk_enable(struct clk *clk)
+{
+       /* Bits 3 & 0 in registers for host 2 should be set for host 3 also */
+       __raw_writel(__raw_readl(APMU_SDH2) | 0x9, APMU_SDH2);
+
+       __raw_writel(__raw_readl(clk->clk_rst) | clk->enable_val, clk->clk_rst);
+}
+
+static void sdh_clk_disable(struct clk *clk)
+{
+       __raw_writel(__raw_readl(clk->clk_rst) & ~clk->enable_val,
+                       clk->clk_rst);
+}
+
+/* Block 1 for controller 0 & 1 */
+struct clkops sdh1_clk_ops = {
+       .enable         = sdh1_clk_enable,
+       .disable        = sdh_clk_disable,
+};
+
+/* Block 2 for controller 2 & 3 */
+struct clkops sdh2_clk_ops = {
+       .enable         = sdh2_clk_enable,
+       .disable        = sdh_clk_disable,
+};
+
  /* APB peripheral clocks */
  static APBC_CLK(uart1, UART1, 1, 14745600);
  static APBC_CLK(uart2, UART2, 1, 14745600);
@@ -60,6 +98,11 @@ static APMU_CLK(lcd, LCD, 0x7f, 312000000);
  static APMU_CLK(eth, ETH, 0x09, 0);
  static APMU_CLK(usb, USB, 0x12, 0);

+static APMU_CLK_OPS(sdh1, SDH0, 0x12, 48000000, &sdh1_clk_ops);
+static APMU_CLK_OPS(sdh2, SDH1, 0x12, 48000000, &sdh1_clk_ops);
+static APMU_CLK_OPS(sdh3, SDH2, 0x12, 48000000, &sdh2_clk_ops);
+static APMU_CLK_OPS(sdh4, SDH3, 0x12, 48000000, &sdh2_clk_ops);
+
  /* device and clock bindings */
  static struct clk_lookup pxa168_clkregs[] = {
         INIT_CLKREG(&clk_uart1, "pxa2xx-uart.0", NULL),
@@ -83,6 +126,10 @@ static struct clk_lookup pxa168_clkregs[] = {
         INIT_CLKREG(&clk_eth, "pxa168-eth", "MFUCLK"),
         INIT_CLKREG(&clk_usb, NULL, "PXA168-USBCLK"),
         INIT_CLKREG(&clk_rtc, "sa1100-rtc", NULL),
+       INIT_CLKREG(&clk_sdh1, "sdhci-pxav2.0", "PXA-SDHCLK"),
+       INIT_CLKREG(&clk_sdh2, "sdhci-pxav2.1", "PXA-SDHCLK"),
+       INIT_CLKREG(&clk_sdh3, "sdhci-pxav2.2", "PXA-SDHCLK"),
+       INIT_CLKREG(&clk_sdh4, "sdhci-pxav2.3", "PXA-SDHCLK"),
  };

  void __init pxa168_clk_init(void)
diff --git a/arch/arm/mach-mmp/include/mach/pxa168.h b/arch/arm/mach-mmp/include/mach/pxa168.h
index 37632d9..805117e 100644
--- a/arch/arm/mach-mmp/include/mach/pxa168.h
+++ b/arch/arm/mach-mmp/include/mach/pxa168.h
@@ -17,6 +17,7 @@ extern void pxa168_clear_keypad_wakeup(void);
  #include <mach/cputype.h>
  #include <linux/pxa168_eth.h>
  #include <linux/platform_data/mv_usb.h>
+#include <linux/platform_data/pxa_sdhci.h>

  extern struct pxa_device_desc pxa168_device_uart1;
  extern struct pxa_device_desc pxa168_device_uart2;
@@ -36,6 +37,10 @@ extern struct pxa_device_desc pxa168_device_nand;
  extern struct pxa_device_desc pxa168_device_fb;
  extern struct pxa_device_desc pxa168_device_keypad;
  extern struct pxa_device_desc pxa168_device_eth;
+extern struct pxa_device_desc pxa168_device_sdh1;
+extern struct pxa_device_desc pxa168_device_sdh2;
+extern struct pxa_device_desc pxa168_device_sdh3;
+extern struct pxa_device_desc pxa168_device_sdh4;

  /* pdata can be NULL */
  extern int __init pxa168_add_usb_host(struct mv_usb_platform_data *pdata);
@@ -133,4 +138,19 @@ static inline int pxa168_add_eth(struct pxa168_eth_platform_data *data)
  {
         return pxa_register_device(&pxa168_device_eth, data, sizeof(*data));
  }
+
+static inline int pxa168_add_sdh(int id, struct sdhci_pxa_platdata *data)
+{
+       struct pxa_device_desc *d = NULL;
+
+       switch (id) {
+       case 1: d = &pxa168_device_sdh1; break;
+       case 2: d = &pxa168_device_sdh2; break;
+       case 3: d = &pxa168_device_sdh3; break;
+       case 4: d = &pxa168_device_sdh4; break;
+       default:
+               return -EINVAL;
+       }
+       return pxa_register_device(d, data, sizeof(*data));
+}
  #endif /* __ASM_MACH_PXA168_H */
diff --git a/arch/arm/mach-mmp/pxa168.c b/arch/arm/mach-mmp/pxa168.c
index b7f074f..ab5f273 100644
--- a/arch/arm/mach-mmp/pxa168.c
+++ b/arch/arm/mach-mmp/pxa168.c
@@ -114,6 +114,10 @@ PXA168_DEVICE(ssp5, "pxa168-ssp", 4, SSP5, 0xd4021000, 0x40, 60, 61);
  PXA168_DEVICE(fb, "pxa168-fb", -1, LCD, 0xd420b000, 0x1c8);
  PXA168_DEVICE(keypad, "pxa27x-keypad", -1, KEYPAD, 0xd4012000, 0x4c);
  PXA168_DEVICE(eth, "pxa168-eth", -1, MFU, 0xc0800000, 0x0fff);
+PXA168_DEVICE(sdh1, "sdhci-pxav2", 0, SDH1, 0xd4280000, 0x100);
+PXA168_DEVICE(sdh2, "sdhci-pxav2", 1, SDH1, 0xd4281000, 0x100);
+PXA168_DEVICE(sdh3, "sdhci-pxav2", 2, SDH2, 0xd427e000, 0x100);
+PXA168_DEVICE(sdh4, "sdhci-pxav2", 3, SDH2, 0xd427f000, 0x100);

  struct resource pxa168_resource_gpio[] = {
         {
--
1.7.9.5

No, we shouldn't drop COMMON_CLK. Now you're using legacy code that
isn't our goal.

You should enable DT mode. Please refer to drivers/clk/mmp/clk-pxa168.c.
I think that SD clocks are already considered.

Regards
Haojian

I am sorry, I wasn't aware of this development. As per 
ARMADA_16x_Software_Manual.pdf enabling clock for SD controller 2 & 4 
needs to set bit 3 & 0 in registers for SD controller 1 & 3 
(respectively). This is done by below code in my patch. Now what's the 
best way to do this with new COMMON_CLK implementation? If I make SD 
clock 0 & 2 parents for 1 & 3, it will unnecessarily keep clocks enabled 
for other controllers whether or not they are needed. What's "DT" mode?

+static void sdh1_clk_enable(struct clk *clk)
+{
+       /* Bits 3 & 0 in registers for host 0 should be set for host 1 also */
+       __raw_writel(__raw_readl(APMU_SDH0) | 0x9, APMU_SDH0);
...

+static void sdh2_clk_enable(struct clk *clk)
+{
+       /* Bits 3 & 0 in registers for host 2 should be set for host 3 also */
+       __raw_writel(__raw_readl(APMU_SDH2) | 0x9, APMU_SDH2);

Thanks,

Tanmay

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