[PATCH v4 2/4] ARM: pxa168: Add SDHCI support

Tanmay Upadhyay tanmay.upadhyay at einfochips.com
Tue Dec 20 08:44:59 EST 2011



On Tuesday 20 December 2011 07:08 PM, Haojian Zhuang wrote:
> On Tue, Dec 20, 2011 at 9:25 PM, Haojian Zhuang
> <haojian.zhuang at gmail.com>  wrote:
>> On Tue, Dec 20, 2011 at 9:13 PM, Tanmay Upadhyay
>> <tanmay.upadhyay at einfochips.com>  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
>>>
>>> Signed-off-by: Tanmay Upadhyay<tanmay.upadhyay at einfochips.com>
>>> Reviewed-by: Philip Rakity<prakity at marvell.com>
>>> ---
>>>   arch/arm/mach-mmp/include/mach/pxa168.h    |   20 ++++++++++++++
>>>   arch/arm/mach-mmp/include/mach/regs-apmu.h |   40 ++++++++++++++-------------
>>>   arch/arm/mach-mmp/pxa168.c                 |   39 +++++++++++++++++++++++++++
>>>   3 files changed, 80 insertions(+), 19 deletions(-)
>>>
>>> diff --git a/arch/arm/mach-mmp/include/mach/pxa168.h b/arch/arm/mach-mmp/include/mach/pxa168.h
>>> index 7fb568d..a181608 100644
>>> --- a/arch/arm/mach-mmp/include/mach/pxa168.h
>>> +++ b/arch/arm/mach-mmp/include/mach/pxa168.h
>>> @@ -15,6 +15,7 @@ extern void pxa168_clear_keypad_wakeup(void);
>>>   #include<plat/pxa27x_keypad.h>
>>>   #include<mach/cputype.h>
>>>   #include<linux/pxa168_eth.h>
>>> +#include<linux/platform_data/pxa_sdhci.h>
>>>
>>>   extern struct pxa_device_desc pxa168_device_uart1;
>>>   extern struct pxa_device_desc pxa168_device_uart2;
>>> @@ -34,6 +35,10 @@ 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;
>>>
>>>   struct pxa168_usb_pdata {
>>>         /* If NULL, default phy init routine for PXA168 would be called */
>>> @@ -132,4 +137,19 @@ 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/include/mach/regs-apmu.h b/arch/arm/mach-mmp/include/mach/regs-apmu.h
>>> index 8447ac6..a84de77 100644
>>> --- a/arch/arm/mach-mmp/include/mach/regs-apmu.h
>>> +++ b/arch/arm/mach-mmp/include/mach/regs-apmu.h
>>> @@ -17,27 +17,29 @@
>>>   #define APMU_REG(x)    (APMU_VIRT_BASE + (x))
>>>
>>>   /* Clock Reset Control */
>>> -#define APMU_IRE       APMU_REG(0x048)
>>> -#define APMU_LCD       APMU_REG(0x04c)
>>> -#define APMU_CCIC      APMU_REG(0x050)
>>> -#define APMU_SDH0      APMU_REG(0x054)
>>> -#define APMU_SDH1      APMU_REG(0x058)
>>> -#define APMU_USB       APMU_REG(0x05c)
>>> -#define APMU_NAND      APMU_REG(0x060)
>>> -#define APMU_DMA       APMU_REG(0x064)
>>> -#define APMU_GEU       APMU_REG(0x068)
>>> -#define APMU_BUS       APMU_REG(0x06c)
>>> -#define APMU_SDH2      APMU_REG(0x0e8)
>>> -#define APMU_SDH3      APMU_REG(0x0ec)
>>> -#define APMU_ETH       APMU_REG(0x0fc)
>>> -
>>> -#define APMU_FNCLK_EN  (1<<  4)
>>> -#define APMU_AXICLK_EN (1<<  3)
>>> -#define APMU_FNRST_DIS (1<<  1)
>>> -#define APMU_AXIRST_DIS        (1<<  0)
>>> +#define APMU_IRE               APMU_REG(0x048)
>>> +#define APMU_LCD               APMU_REG(0x04c)
>>> +#define APMU_CCIC              APMU_REG(0x050)
>>> +#define APMU_SDH0              APMU_REG(0x054)
>>> +#define APMU_SDH1              APMU_REG(0x058)
>>> +#define APMU_USB               APMU_REG(0x05c)
>>> +#define APMU_NAND              APMU_REG(0x060)
>>> +#define APMU_DMA               APMU_REG(0x064)
>>> +#define APMU_GEU               APMU_REG(0x068)
>>> +#define APMU_BUS               APMU_REG(0x06c)
>>> +#define APMU_PXA168_SDH2       APMU_REG(0x0e0)
>>> +#define APMU_PXA168_SDH3       APMU_REG(0x0e4)
>>> +#define APMU_SDH2              APMU_REG(0x0e8)
>>> +#define APMU_SDH3              APMU_REG(0x0ec)
>>> +#define APMU_ETH               APMU_REG(0x0fc)
> Since you only append APMU_PXA168_SDH2&  APMU_PXA168_SDH3, you'd
> better not touch other registers.
> If you want to clean the code, you can submit another patch to handle it.
>

Ok.

-- Tanmay

>>> +
>>> +#define APMU_FNCLK_EN          (1<<  4)
>>> +#define APMU_AXICLK_EN         (1<<  3)
>>> +#define APMU_FNRST_DIS         (1<<  1)
>>> +#define APMU_AXIRST_DIS                (1<<  0)
>>>
>>>   /* Wake Clear Register */
>>> -#define APMU_WAKE_CLR  APMU_REG(0x07c)
>>> +#define APMU_WAKE_CLR          APMU_REG(0x07c)
>>>
>>>   #define APMU_PXA168_KP_WAKE_CLR                (1<<  7)
>>>   #define APMU_PXA168_CFI_WAKE_CLR       (1<<  6)
>>> diff --git a/arch/arm/mach-mmp/pxa168.c b/arch/arm/mach-mmp/pxa168.c
>>> index 76ca15c..023659b 100644
>>> --- a/arch/arm/mach-mmp/pxa168.c
>>> +++ b/arch/arm/mach-mmp/pxa168.c
>>> @@ -65,6 +65,32 @@ void __init pxa168_init_irq(void)
>>>         pxa168_init_gpio();
>>>   }
>>>
>>> +static void sdh_clk_enable(struct clk *clk)
>>> +{
>>> +       void __iomem *reg_offset = clk->clk_rst;
>>> +
>>> +       /* Can't see any clean way to do this: Bits 3&  0 in registers
>>> +        * for host 0&  2 should be set for host 1&  3 also */
>>> +       if (reg_offset == APMU_SDH0 || reg_offset == APMU_SDH1)
>>> +               __raw_writel(__raw_readl(APMU_SDH0) | 0x9, APMU_SDH0);
>>> +       if (reg_offset == APMU_PXA168_SDH2 || reg_offset == APMU_PXA168_SDH3)
>>> +               __raw_writel(__raw_readl(APMU_PXA168_SDH2) | 0x9,
>>> +                               APMU_PXA168_SDH2);
>>> +
>>> +       __raw_writel(__raw_readl(clk->clk_rst) | clk->enable_val, clk->clk_rst);
>>> +}
>>> +
>> How about use the below code instead? I think we can avoid to check
>> register offset.
>>
>> static void sdh0_clk_enable(struct clk *clk)
>> {
>>        void __iomem *reg_offset = clk->clk_rst;
>>
>>        __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)
>> {
>>        void __iomem *reg_offset = clk->clk_rst;
>>                __raw_writel(__raw_readl(APMU_PXA168_SDH2) | 0x9,
>>                                APMU_PXA168_SDH2);
>>        __raw_writel(__raw_readl(clk->clk_rst) | clk->enable_val, clk->clk_rst);
>>
>> }
>>
>> struct clkops sdh0_clk_ops = {
>>       .enable         = sdh0_clk_enable,
>>       .disable        = sdh_clk_disable,
>> };
>>
>> struct clkops sdh2_clk_ops = {
>>       .enable         = sdh2_clk_enable,
>>       .disable        = sdh_clk_disable,
>> };
>>
>> static APMU_CLK_OPS(sdh1, SDH0, 0x12, 48000000,&sdh0_clk_ops);
>> static APMU_CLK_OPS(sdh2, SDH1, 0x12, 48000000,&sdh0_clk_ops);
>> static APMU_CLK_OPS(sdh3, PXA168_SDH2, 0x12, 48000000,&sdh2_clk_ops);
>> static APMU_CLK_OPS(sdh4, PXA168_SDH3, 0x12, 48000000,&sdh2_clk_ops);
>>



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