Re: [PATCH v2] TWL4030: Initial support for TWL5031

From: Samuel Ortiz
Date: Wed Nov 04 2009 - 11:06:54 EST

Hi Ilkka,

Some comments below:

On Fri, Oct 16, 2009 at 05:12:40PM +0300, Ilkka Koskinen wrote:
> TWL5031 introduces two new interrupts in PIH. Moreover, BCI
> has changed remarkably and, thus, it's disabled when TWL5031
> is in use.
>
> Signed-off-by: Ilkka Koskinen <ilkka.koskinen@xxxxxxxxx>
> ---
> drivers/mfd/twl4030-core.c | 12 ++++-
> drivers/mfd/twl4030-irq.c | 127 +++++++++++++++++++++++++++++++++++++++++--
> include/linux/i2c/twl4030.h | 47 ++++++++++++++--
> 3 files changed, 173 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/mfd/twl4030-core.c b/drivers/mfd/twl4030-core.c
> index 5596bb4..5dc5062 100644
> --- a/drivers/mfd/twl4030-core.c
> +++ b/drivers/mfd/twl4030-core.c
> @@ -152,6 +152,9 @@
> #define TWL4030_BASEADD_PWMB 0x00F1
> #define TWL4030_BASEADD_KEYPAD 0x00D2
>
> +#define TWL5031_BASEADD_ACCESSORY 0x0074 /* Replaces Main Charge */
> +#define TWL5031_BASEADD_INTERRUPTS 0x00B9 /* Different to TWL4030's one */
Should be "Different than..."


> +
> /* subchip/slave 3 - POWER ID */
> #define TWL4030_BASEADD_BACKUP 0x0014
> #define TWL4030_BASEADD_INT 0x002E
> @@ -183,6 +186,7 @@
> /* chip-specific feature flags, for i2c_device_id.driver_data */
> #define TWL4030_VAUX2 BIT(0) /* pre-5030 voltage ranges */
> #define TPS_SUBSET BIT(1) /* tps659[23]0 have fewer LDOs */
> +#define TWL5031 BIT(2) /* twl5031 has different registers */
>
> /*----------------------------------------------------------------------*/
>
> @@ -235,6 +239,8 @@ static struct twl4030mapping twl4030_map[TWL4030_MODULE_LAST + 1] = {
> { 2, TWL4030_BASEADD_PWM1 },
> { 2, TWL4030_BASEADD_PWMA },
> { 2, TWL4030_BASEADD_PWMB },
> + { 2, TWL5031_BASEADD_ACCESSORY },
> + { 2, TWL5031_BASEADD_INTERRUPTS },
>
> { 3, TWL4030_BASEADD_BACKUP },
> { 3, TWL4030_BASEADD_INT },
> @@ -483,7 +489,8 @@ add_children(struct twl4030_platform_data *pdata, unsigned long features)
> struct device *child;
> struct device *usb_transceiver = NULL;
>
> - if (twl_has_bci() && pdata->bci && !(features & TPS_SUBSET)) {
> + if (twl_has_bci() && pdata->bci &&
> + !((features & TPS_SUBSET) || (features & TWL5031))) {
could be simpler: !((features & (TPS_SUBSET | TWL5031))


> child = add_child(3, "twl4030_bci",
> pdata->bci, sizeof(*pdata->bci),
> false,
> @@ -743,6 +750,7 @@ static void clocks_init(struct device *dev,
>
> int twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end);
> int twl_exit_irq(void);
> +int twl_init_chip_irq(const char *chip);
>
> static int twl4030_remove(struct i2c_client *client)
> {
> @@ -820,6 +828,7 @@ twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
> if (client->irq
> && pdata->irq_base
> && pdata->irq_end > pdata->irq_base) {
> + twl_init_chip_irq(id->name);
> status = twl_init_irq(client->irq, pdata->irq_base, pdata->irq_end);
> if (status < 0)
> goto fail;
> @@ -835,6 +844,7 @@ fail:
> static const struct i2c_device_id twl4030_ids[] = {
> { "twl4030", TWL4030_VAUX2 }, /* "Triton 2" */
> { "twl5030", 0 }, /* T2 updated */
> + { "twl5031", TWL5031 }, /* TWL5030 updated */
> { "tps65950", 0 }, /* catalog version of twl5030 */
> { "tps65930", TPS_SUBSET }, /* fewer LDOs and DACs; no charger */
> { "tps65920", TPS_SUBSET }, /* fewer LDOs; no codec or charger */
> diff --git a/drivers/mfd/twl4030-irq.c b/drivers/mfd/twl4030-irq.c
> index fb194fe..a64994e 100644
> --- a/drivers/mfd/twl4030-irq.c
> +++ b/drivers/mfd/twl4030-irq.c
> @@ -61,6 +61,7 @@
>
> /* Linux could (eventually) use either IRQ line */
> static int irq_line;
> +static int chip_is_twl5031;
>
> struct sih {
> char name[8];
> @@ -82,6 +83,9 @@ struct sih {
> /* + 2 bytes padding */
> };
>
> +static const struct sih *sih_modules;
> +static int nr_sih_modules;
> +
> #define SIH_INITIALIZER(modname, nbits) \
> .module = TWL4030_MODULE_ ## modname, \
> .control_offset = TWL4030_ ## modname ## _SIH_CTRL, \
> @@ -107,7 +111,8 @@ struct sih {
> /* Order in this table matches order in PIH_ISR. That is,
> * BIT(n) in PIH_ISR is sih_modules[n].
> */
> -static const struct sih sih_modules[6] = {
> +/* sih_modules_twl4030 is used for twl4030 and twl5030 */
> +static const struct sih sih_modules_twl4030[6] = {
> [0] = {
> .name = "gpio",
> .module = TWL4030_MODULE_GPIO,
> @@ -164,6 +169,84 @@ static const struct sih sih_modules[6] = {
> /* there are no SIH modules #6 or #7 ... */
> };
>
> +static const struct sih sih_modules_twl5031[8] = {
> + [0] = {
> + .name = "gpio",
> + .module = TWL4030_MODULE_GPIO,
> + .control_offset = REG_GPIO_SIH_CTRL,
> + .set_cor = true,
> + .bits = TWL4030_GPIO_MAX,
> + .bytes_ixr = 3,
> + /* Note: *all* of these IRQs default to no-trigger */
> + .edr_offset = REG_GPIO_EDR1,
> + .bytes_edr = 5,
> + .mask = { {
> + .isr_offset = REG_GPIO_ISR1A,
> + .imr_offset = REG_GPIO_IMR1A,
> + }, {
> + .isr_offset = REG_GPIO_ISR1B,
> + .imr_offset = REG_GPIO_IMR1B,
> + }, },
> + },
> + [1] = {
> + .name = "keypad",
> + .set_cor = true,
> + SIH_INITIALIZER(KEYPAD_KEYP, 4)
> + },
> + [2] = {
> + .name = "bci",
> + .module = TWL5031_MODULE_INTERRUPTS,
> + .control_offset = TWL5031_INTERRUPTS_BCISIHCTRL,
> + .bits = 7,
> + .bytes_ixr = 1,
> + .edr_offset = TWL5031_INTERRUPTS_BCIEDR1,
> + /* Note: most of these IRQs default to no-trigger */
> + .bytes_edr = 2,
> + .mask = { {
> + .isr_offset = TWL5031_INTERRUPTS_BCIISR1,
> + .imr_offset = TWL5031_INTERRUPTS_BCIIMR1,
> + }, {
> + .isr_offset = TWL5031_INTERRUPTS_BCIISR2,
> + .imr_offset = TWL5031_INTERRUPTS_BCIIMR2,
> + }, },
> + },
> + [3] = {
> + .name = "madc",
> + SIH_INITIALIZER(MADC, 4)
> + },
> + [4] = {
> + /* USB doesn't use the same SIH organization */
> + .name = "usb",
> + },
> + [5] = {
> + .name = "power",
> + .set_cor = true,
> + SIH_INITIALIZER(INT_PWR, 8)
> + },
> + [6] = {
> + /* ACI doesn't use the same SIH organization */
> + .name = "aci",
> + },
> + [7] = {
> + /* Accessory */
> + .name = "acc",
> + .module = TWL5031_MODULE_ACCESSORY,
> + .control_offset = TWL5031_ACCSIHCTRL,
> + .bits = 2,
> + .bytes_ixr = 1,
> + .edr_offset = TWL5031_ACCEDR1,
> + /* Note: most of these IRQs default to no-trigger */
> + .bytes_edr = 1,
> + .mask = { {
> + .isr_offset = TWL5031_ACCISR1,
> + .imr_offset = TWL5031_ACCIMR1,
> + }, {
> + .isr_offset = TWL5031_ACCISR2,
> + .imr_offset = TWL5031_ACCIMR2,
> + }, },
> + },
> +};
> +
> #undef TWL4030_MODULE_KEYPAD_KEYP
> #undef TWL4030_MODULE_INT_PWR
> #undef TWL4030_INT_PWR_EDR
> @@ -284,11 +367,20 @@ static int twl4030_init_sih_modules(unsigned line)
> /* disable all interrupts on our line */
> memset(buf, 0xff, sizeof buf);
> sih = sih_modules;
> - for (i = 0; i < ARRAY_SIZE(sih_modules); i++, sih++) {
> + for (i = 0; i < nr_sih_modules; i++, sih++) {
>
> /* skip USB -- it's funky */
> - if (!sih->bytes_ixr)
> + /* But don't skip TWL5031's ACI */
> + if (!sih->bytes_ixr) {
> + if (chip_is_twl5031 && !strcmp(sih->name, "aci")) {
> + twl4030_i2c_write(TWL5031_MODULE_ACCESSORY,
> + buf, TWL5031_ACIIMR_LSB, 1);
> + twl4030_i2c_write(TWL5031_MODULE_ACCESSORY,
> + buf, TWL5031_ACIIMR_MSB, 1);
> + }
> +
A few comments on this:
- Why do we have to do that for the accessory ? Some comments would be
appropriate.
- You could use twl4030_i2c_write_u8(), couldnt you ?
- I'd like it to be more generic: TWL5031_MODULE_ACCESSORY should be replaced
by sih->module, and the TWL5031_ACII* register should be somehow integrated in
the sih struct. The idea is to get rid of this chip_is_twl5031.


> continue;
> + }
>
> status = twl4030_i2c_write(sih->module, buf,
> sih->mask[line].imr_offset, sih->bytes_ixr);
> @@ -314,13 +406,22 @@ static int twl4030_init_sih_modules(unsigned line)
> }
>
> sih = sih_modules;
> - for (i = 0; i < ARRAY_SIZE(sih_modules); i++, sih++) {
> + for (i = 0; i < nr_sih_modules; i++, sih++) {
> u8 rxbuf[4];
> int j;
>
> /* skip USB */
> - if (!sih->bytes_ixr)
> + /* But don't skip TWL5031's ACI */
> + if (!sih->bytes_ixr) {
> + if (chip_is_twl5031 && !strcmp(sih->name, "aci")) {
> + twl4030_i2c_write(TWL5031_MODULE_ACCESSORY,
> + buf, TWL5031_ACIIDR_LSB, 1);
> + twl4030_i2c_write(TWL5031_MODULE_ACCESSORY,
> + buf, TWL5031_ACIIDR_MSB, 1);
> + }
> +
> continue;
> + }
>
> /* Clear pending interrupt status. Either the read was
> * enough, or we need to write those bits. Repeat, in
> @@ -611,7 +712,7 @@ int twl4030_sih_setup(int module)
>
> /* only support modules with standard clear-on-read for now */
> for (sih_mod = 0, sih = sih_modules;
> - sih_mod < ARRAY_SIZE(sih_modules);
> + sih_mod < nr_sih_modules;
> sih_mod++, sih++) {
> if (sih->module == module && sih->set_cor) {
> if (!WARN((irq_base + sih->bits) > NR_IRQS,
> @@ -756,3 +857,17 @@ int twl_exit_irq(void)
> }
> return 0;
> }
> +
> +int twl_init_chip_irq(const char *chip)
> +{
> + if (!strcmp(chip, "twl5031")) {
> + chip_is_twl5031 = 1;
> + sih_modules = sih_modules_twl5031;
> + nr_sih_modules = ARRAY_SIZE(sih_modules_twl5031);
I dont think you need nr_sih_modules at all. sih_modules is pointing to the
right array, and then you can keep the ARRAY_SIZE(sih_modules) call instead of
defining yet another static variable.

Talking about static variables and such, I really think the twl driver needs
some cleanup. It should really be allocating a private device structure at
probe time containing all those static crap. As this driver is growing and
supporting more and more HW, it starts to be messy.

Cheers,
Samuel.


> + } else {
> + sih_modules = sih_modules_twl4030;
> + nr_sih_modules = ARRAY_SIZE(sih_modules_twl4030);
> + }
> +
> + return 0;
> +}
> diff --git a/include/linux/i2c/twl4030.h b/include/linux/i2c/twl4030.h
> index c8d5078..3fd5791 100644
> --- a/include/linux/i2c/twl4030.h
> +++ b/include/linux/i2c/twl4030.h
> @@ -61,13 +61,16 @@
> #define TWL4030_MODULE_PWMA 0x0E
> #define TWL4030_MODULE_PWMB 0x0F
>
> +#define TWL5031_MODULE_ACCESSORY 0x10
> +#define TWL5031_MODULE_INTERRUPTS 0x11
> +
> /* Slave 3 (i2c address 0x4b) */
> -#define TWL4030_MODULE_BACKUP 0x10
> -#define TWL4030_MODULE_INT 0x11
> -#define TWL4030_MODULE_PM_MASTER 0x12
> -#define TWL4030_MODULE_PM_RECEIVER 0x13
> -#define TWL4030_MODULE_RTC 0x14
> -#define TWL4030_MODULE_SECURED_REG 0x15
> +#define TWL4030_MODULE_BACKUP 0x12
> +#define TWL4030_MODULE_INT 0x13
> +#define TWL4030_MODULE_PM_MASTER 0x14
> +#define TWL4030_MODULE_PM_RECEIVER 0x15
> +#define TWL4030_MODULE_RTC 0x16
> +#define TWL4030_MODULE_SECURED_REG 0x17
>
> /*
> * Read and write single 8-bit registers
> @@ -221,6 +224,38 @@ int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes);
>
> /*----------------------------------------------------------------------*/
>
> +/*
> + * Accessory Interrupts
> + */
> +#define TWL5031_ACIIMR_LSB 0x05
> +#define TWL5031_ACIIMR_MSB 0x06
> +#define TWL5031_ACIIDR_LSB 0x07
> +#define TWL5031_ACIIDR_MSB 0x08
> +#define TWL5031_ACCISR1 0x0F
> +#define TWL5031_ACCIMR1 0x10
> +#define TWL5031_ACCISR2 0x11
> +#define TWL5031_ACCIMR2 0x12
> +#define TWL5031_ACCSIR 0x13
> +#define TWL5031_ACCEDR1 0x14
> +#define TWL5031_ACCSIHCTRL 0x15
> +
> +/*----------------------------------------------------------------------*/
> +
> +/*
> + * Battery Charger Controller
> + */
> +
> +#define TWL5031_INTERRUPTS_BCIISR1 0x0
> +#define TWL5031_INTERRUPTS_BCIIMR1 0x1
> +#define TWL5031_INTERRUPTS_BCIISR2 0x2
> +#define TWL5031_INTERRUPTS_BCIIMR2 0x3
> +#define TWL5031_INTERRUPTS_BCISIR 0x4
> +#define TWL5031_INTERRUPTS_BCIEDR1 0x5
> +#define TWL5031_INTERRUPTS_BCIEDR2 0x6
> +#define TWL5031_INTERRUPTS_BCISIHCTRL 0x7
> +
> +/*----------------------------------------------------------------------*/
> +
> /* Power bus message definitions */
>
> /* The TWL4030/5030 splits its power-management resources (the various
> --
> 1.6.0.4
>

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